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904b10fb18
Add these PCI class codes to pci_ids.h: PCI_CLASS_BRIDGE_PCI_NORMAL PCI_CLASS_BRIDGE_PCI_SUBTRACTIVE Use these defines in all kernel code for describing PCI class codes for normal and subtractive PCI bridges. [bhelgaas: similar change in pci-mvebu.c] Link: https://lore.kernel.org/r/20220214114109.26809-1-pali@kernel.org Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2818 lines
72 KiB
C
2818 lines
72 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* PCIe host controller driver for Tegra SoCs
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*
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* Copyright (c) 2010, CompuLab, Ltd.
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* Author: Mike Rapoport <mike@compulab.co.il>
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*
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* Based on NVIDIA PCIe driver
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* Copyright (c) 2008-2009, NVIDIA Corporation.
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*
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* Bits taken from arch/arm/mach-dove/pcie.c
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*
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* Author: Thierry Reding <treding@nvidia.com>
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*/
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#include <linux/clk.h>
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/iopoll.h>
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#include <linux/irq.h>
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#include <linux/irqchip/chained_irq.h>
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#include <linux/irqdomain.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/msi.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/of_platform.h>
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#include <linux/pci.h>
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#include <linux/phy/phy.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/regulator/consumer.h>
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#include <soc/tegra/cpuidle.h>
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#include <soc/tegra/pmc.h>
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#include "../pci.h"
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#define INT_PCI_MSI_NR (8 * 32)
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/* register definitions */
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#define AFI_AXI_BAR0_SZ 0x00
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#define AFI_AXI_BAR1_SZ 0x04
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#define AFI_AXI_BAR2_SZ 0x08
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#define AFI_AXI_BAR3_SZ 0x0c
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#define AFI_AXI_BAR4_SZ 0x10
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#define AFI_AXI_BAR5_SZ 0x14
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#define AFI_AXI_BAR0_START 0x18
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#define AFI_AXI_BAR1_START 0x1c
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#define AFI_AXI_BAR2_START 0x20
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#define AFI_AXI_BAR3_START 0x24
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#define AFI_AXI_BAR4_START 0x28
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#define AFI_AXI_BAR5_START 0x2c
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#define AFI_FPCI_BAR0 0x30
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#define AFI_FPCI_BAR1 0x34
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#define AFI_FPCI_BAR2 0x38
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#define AFI_FPCI_BAR3 0x3c
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#define AFI_FPCI_BAR4 0x40
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#define AFI_FPCI_BAR5 0x44
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#define AFI_CACHE_BAR0_SZ 0x48
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#define AFI_CACHE_BAR0_ST 0x4c
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#define AFI_CACHE_BAR1_SZ 0x50
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#define AFI_CACHE_BAR1_ST 0x54
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#define AFI_MSI_BAR_SZ 0x60
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#define AFI_MSI_FPCI_BAR_ST 0x64
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#define AFI_MSI_AXI_BAR_ST 0x68
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#define AFI_MSI_VEC(x) (0x6c + ((x) * 4))
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#define AFI_MSI_EN_VEC(x) (0x8c + ((x) * 4))
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#define AFI_CONFIGURATION 0xac
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#define AFI_CONFIGURATION_EN_FPCI (1 << 0)
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#define AFI_CONFIGURATION_CLKEN_OVERRIDE (1 << 31)
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#define AFI_FPCI_ERROR_MASKS 0xb0
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#define AFI_INTR_MASK 0xb4
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#define AFI_INTR_MASK_INT_MASK (1 << 0)
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#define AFI_INTR_MASK_MSI_MASK (1 << 8)
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#define AFI_INTR_CODE 0xb8
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#define AFI_INTR_CODE_MASK 0xf
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#define AFI_INTR_INI_SLAVE_ERROR 1
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#define AFI_INTR_INI_DECODE_ERROR 2
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#define AFI_INTR_TARGET_ABORT 3
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#define AFI_INTR_MASTER_ABORT 4
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#define AFI_INTR_INVALID_WRITE 5
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#define AFI_INTR_LEGACY 6
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#define AFI_INTR_FPCI_DECODE_ERROR 7
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#define AFI_INTR_AXI_DECODE_ERROR 8
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#define AFI_INTR_FPCI_TIMEOUT 9
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#define AFI_INTR_PE_PRSNT_SENSE 10
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#define AFI_INTR_PE_CLKREQ_SENSE 11
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#define AFI_INTR_CLKCLAMP_SENSE 12
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#define AFI_INTR_RDY4PD_SENSE 13
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#define AFI_INTR_P2P_ERROR 14
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#define AFI_INTR_SIGNATURE 0xbc
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#define AFI_UPPER_FPCI_ADDRESS 0xc0
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#define AFI_SM_INTR_ENABLE 0xc4
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#define AFI_SM_INTR_INTA_ASSERT (1 << 0)
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#define AFI_SM_INTR_INTB_ASSERT (1 << 1)
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#define AFI_SM_INTR_INTC_ASSERT (1 << 2)
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#define AFI_SM_INTR_INTD_ASSERT (1 << 3)
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#define AFI_SM_INTR_INTA_DEASSERT (1 << 4)
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#define AFI_SM_INTR_INTB_DEASSERT (1 << 5)
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#define AFI_SM_INTR_INTC_DEASSERT (1 << 6)
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#define AFI_SM_INTR_INTD_DEASSERT (1 << 7)
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#define AFI_AFI_INTR_ENABLE 0xc8
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#define AFI_INTR_EN_INI_SLVERR (1 << 0)
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#define AFI_INTR_EN_INI_DECERR (1 << 1)
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#define AFI_INTR_EN_TGT_SLVERR (1 << 2)
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#define AFI_INTR_EN_TGT_DECERR (1 << 3)
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#define AFI_INTR_EN_TGT_WRERR (1 << 4)
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#define AFI_INTR_EN_DFPCI_DECERR (1 << 5)
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#define AFI_INTR_EN_AXI_DECERR (1 << 6)
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#define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
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#define AFI_INTR_EN_PRSNT_SENSE (1 << 8)
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#define AFI_PCIE_PME 0xf0
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#define AFI_PCIE_CONFIG 0x0f8
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#define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1))
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#define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1 (0x0 << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_401 (0x0 << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1 (0x1 << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211 (0x1 << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20)
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#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_111 (0x2 << 20)
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#define AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO(x) (1 << ((x) + 29))
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#define AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO_ALL (0x7 << 29)
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#define AFI_FUSE 0x104
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#define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2)
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#define AFI_PEX0_CTRL 0x110
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#define AFI_PEX1_CTRL 0x118
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#define AFI_PEX_CTRL_RST (1 << 0)
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#define AFI_PEX_CTRL_CLKREQ_EN (1 << 1)
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#define AFI_PEX_CTRL_REFCLK_EN (1 << 3)
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#define AFI_PEX_CTRL_OVERRIDE_EN (1 << 4)
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#define AFI_PLLE_CONTROL 0x160
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#define AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL (1 << 9)
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#define AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN (1 << 1)
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#define AFI_PEXBIAS_CTRL_0 0x168
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#define RP_ECTL_2_R1 0x00000e84
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#define RP_ECTL_2_R1_RX_CTLE_1C_MASK 0xffff
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#define RP_ECTL_4_R1 0x00000e8c
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#define RP_ECTL_4_R1_RX_CDR_CTRL_1C_MASK (0xffff << 16)
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#define RP_ECTL_4_R1_RX_CDR_CTRL_1C_SHIFT 16
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#define RP_ECTL_5_R1 0x00000e90
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#define RP_ECTL_5_R1_RX_EQ_CTRL_L_1C_MASK 0xffffffff
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#define RP_ECTL_6_R1 0x00000e94
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#define RP_ECTL_6_R1_RX_EQ_CTRL_H_1C_MASK 0xffffffff
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#define RP_ECTL_2_R2 0x00000ea4
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#define RP_ECTL_2_R2_RX_CTLE_1C_MASK 0xffff
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#define RP_ECTL_4_R2 0x00000eac
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#define RP_ECTL_4_R2_RX_CDR_CTRL_1C_MASK (0xffff << 16)
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#define RP_ECTL_4_R2_RX_CDR_CTRL_1C_SHIFT 16
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#define RP_ECTL_5_R2 0x00000eb0
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#define RP_ECTL_5_R2_RX_EQ_CTRL_L_1C_MASK 0xffffffff
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#define RP_ECTL_6_R2 0x00000eb4
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#define RP_ECTL_6_R2_RX_EQ_CTRL_H_1C_MASK 0xffffffff
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#define RP_VEND_XP 0x00000f00
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#define RP_VEND_XP_DL_UP (1 << 30)
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#define RP_VEND_XP_OPPORTUNISTIC_ACK (1 << 27)
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#define RP_VEND_XP_OPPORTUNISTIC_UPDATEFC (1 << 28)
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#define RP_VEND_XP_UPDATE_FC_THRESHOLD_MASK (0xff << 18)
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#define RP_VEND_CTL0 0x00000f44
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#define RP_VEND_CTL0_DSK_RST_PULSE_WIDTH_MASK (0xf << 12)
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#define RP_VEND_CTL0_DSK_RST_PULSE_WIDTH (0x9 << 12)
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#define RP_VEND_CTL1 0x00000f48
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#define RP_VEND_CTL1_ERPT (1 << 13)
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#define RP_VEND_XP_BIST 0x00000f4c
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#define RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE (1 << 28)
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#define RP_VEND_CTL2 0x00000fa8
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#define RP_VEND_CTL2_PCA_ENABLE (1 << 7)
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#define RP_PRIV_MISC 0x00000fe0
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#define RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xe << 0)
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#define RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xf << 0)
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#define RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD_MASK (0x7f << 16)
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#define RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD (0xf << 16)
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#define RP_PRIV_MISC_CTLR_CLK_CLAMP_ENABLE (1 << 23)
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#define RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD_MASK (0x7f << 24)
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#define RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD (0xf << 24)
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#define RP_PRIV_MISC_TMS_CLK_CLAMP_ENABLE (1 << 31)
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#define RP_LINK_CONTROL_STATUS 0x00000090
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#define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000
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#define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
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#define RP_LINK_CONTROL_STATUS_2 0x000000b0
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#define PADS_CTL_SEL 0x0000009c
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#define PADS_CTL 0x000000a0
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#define PADS_CTL_IDDQ_1L (1 << 0)
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#define PADS_CTL_TX_DATA_EN_1L (1 << 6)
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#define PADS_CTL_RX_DATA_EN_1L (1 << 10)
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#define PADS_PLL_CTL_TEGRA20 0x000000b8
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#define PADS_PLL_CTL_TEGRA30 0x000000b4
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#define PADS_PLL_CTL_RST_B4SM (1 << 1)
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#define PADS_PLL_CTL_LOCKDET (1 << 8)
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#define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
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#define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16)
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#define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16)
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#define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16)
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#define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
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#define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
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#define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
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#define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22)
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#define PADS_REFCLK_CFG0 0x000000c8
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#define PADS_REFCLK_CFG1 0x000000cc
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#define PADS_REFCLK_BIAS 0x000000d0
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/*
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* Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit
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* entries, one entry per PCIe port. These field definitions and desired
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* values aren't in the TRM, but do come from NVIDIA.
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*/
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#define PADS_REFCLK_CFG_TERM_SHIFT 2 /* 6:2 */
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#define PADS_REFCLK_CFG_E_TERM_SHIFT 7
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#define PADS_REFCLK_CFG_PREDI_SHIFT 8 /* 11:8 */
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#define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */
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#define PME_ACK_TIMEOUT 10000
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#define LINK_RETRAIN_TIMEOUT 100000 /* in usec */
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struct tegra_msi {
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DECLARE_BITMAP(used, INT_PCI_MSI_NR);
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struct irq_domain *domain;
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struct mutex map_lock;
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spinlock_t mask_lock;
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void *virt;
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dma_addr_t phys;
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int irq;
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};
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/* used to differentiate between Tegra SoC generations */
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struct tegra_pcie_port_soc {
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struct {
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u8 turnoff_bit;
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u8 ack_bit;
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} pme;
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};
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struct tegra_pcie_soc {
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unsigned int num_ports;
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const struct tegra_pcie_port_soc *ports;
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unsigned int msi_base_shift;
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unsigned long afi_pex2_ctrl;
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u32 pads_pll_ctl;
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u32 tx_ref_sel;
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u32 pads_refclk_cfg0;
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u32 pads_refclk_cfg1;
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u32 update_fc_threshold;
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bool has_pex_clkreq_en;
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bool has_pex_bias_ctrl;
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bool has_intr_prsnt_sense;
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bool has_cml_clk;
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bool has_gen2;
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bool force_pca_enable;
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bool program_uphy;
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bool update_clamp_threshold;
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bool program_deskew_time;
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bool update_fc_timer;
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bool has_cache_bars;
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struct {
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struct {
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u32 rp_ectl_2_r1;
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u32 rp_ectl_4_r1;
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u32 rp_ectl_5_r1;
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u32 rp_ectl_6_r1;
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u32 rp_ectl_2_r2;
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u32 rp_ectl_4_r2;
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u32 rp_ectl_5_r2;
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u32 rp_ectl_6_r2;
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} regs;
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bool enable;
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} ectl;
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};
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struct tegra_pcie {
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struct device *dev;
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void __iomem *pads;
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void __iomem *afi;
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void __iomem *cfg;
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int irq;
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struct resource cs;
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struct clk *pex_clk;
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struct clk *afi_clk;
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struct clk *pll_e;
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struct clk *cml_clk;
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struct reset_control *pex_rst;
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struct reset_control *afi_rst;
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struct reset_control *pcie_xrst;
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bool legacy_phy;
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struct phy *phy;
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struct tegra_msi msi;
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struct list_head ports;
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u32 xbar_config;
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struct regulator_bulk_data *supplies;
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unsigned int num_supplies;
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const struct tegra_pcie_soc *soc;
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struct dentry *debugfs;
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};
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static inline struct tegra_pcie *msi_to_pcie(struct tegra_msi *msi)
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{
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return container_of(msi, struct tegra_pcie, msi);
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}
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struct tegra_pcie_port {
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struct tegra_pcie *pcie;
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struct device_node *np;
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struct list_head list;
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struct resource regs;
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void __iomem *base;
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unsigned int index;
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unsigned int lanes;
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struct phy **phys;
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struct gpio_desc *reset_gpio;
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};
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static inline void afi_writel(struct tegra_pcie *pcie, u32 value,
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unsigned long offset)
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{
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writel(value, pcie->afi + offset);
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}
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static inline u32 afi_readl(struct tegra_pcie *pcie, unsigned long offset)
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{
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return readl(pcie->afi + offset);
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}
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static inline void pads_writel(struct tegra_pcie *pcie, u32 value,
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unsigned long offset)
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{
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writel(value, pcie->pads + offset);
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}
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static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset)
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{
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return readl(pcie->pads + offset);
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}
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/*
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* The configuration space mapping on Tegra is somewhat similar to the ECAM
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* defined by PCIe. However it deviates a bit in how the 4 bits for extended
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* register accesses are mapped:
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*
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* [27:24] extended register number
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* [23:16] bus number
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* [15:11] device number
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* [10: 8] function number
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* [ 7: 0] register number
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*
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* Mapping the whole extended configuration space would require 256 MiB of
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* virtual address space, only a small part of which will actually be used.
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*
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* To work around this, a 4 KiB region is used to generate the required
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* configuration transaction with relevant B:D:F and register offset values.
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* This is achieved by dynamically programming base address and size of
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* AFI_AXI_BAR used for end point config space mapping to make sure that the
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* address (access to which generates correct config transaction) falls in
|
|
* this 4 KiB region.
|
|
*/
|
|
static unsigned int tegra_pcie_conf_offset(u8 bus, unsigned int devfn,
|
|
unsigned int where)
|
|
{
|
|
return ((where & 0xf00) << 16) | (bus << 16) | (PCI_SLOT(devfn) << 11) |
|
|
(PCI_FUNC(devfn) << 8) | (where & 0xff);
|
|
}
|
|
|
|
static void __iomem *tegra_pcie_map_bus(struct pci_bus *bus,
|
|
unsigned int devfn,
|
|
int where)
|
|
{
|
|
struct tegra_pcie *pcie = bus->sysdata;
|
|
void __iomem *addr = NULL;
|
|
|
|
if (bus->number == 0) {
|
|
unsigned int slot = PCI_SLOT(devfn);
|
|
struct tegra_pcie_port *port;
|
|
|
|
list_for_each_entry(port, &pcie->ports, list) {
|
|
if (port->index + 1 == slot) {
|
|
addr = port->base + (where & ~3);
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
unsigned int offset;
|
|
u32 base;
|
|
|
|
offset = tegra_pcie_conf_offset(bus->number, devfn, where);
|
|
|
|
/* move 4 KiB window to offset within the FPCI region */
|
|
base = 0xfe100000 + ((offset & ~(SZ_4K - 1)) >> 8);
|
|
afi_writel(pcie, base, AFI_FPCI_BAR0);
|
|
|
|
/* move to correct offset within the 4 KiB page */
|
|
addr = pcie->cfg + (offset & (SZ_4K - 1));
|
|
}
|
|
|
|
return addr;
|
|
}
|
|
|
|
static int tegra_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 *value)
|
|
{
|
|
if (bus->number == 0)
|
|
return pci_generic_config_read32(bus, devfn, where, size,
|
|
value);
|
|
|
|
return pci_generic_config_read(bus, devfn, where, size, value);
|
|
}
|
|
|
|
static int tegra_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 value)
|
|
{
|
|
if (bus->number == 0)
|
|
return pci_generic_config_write32(bus, devfn, where, size,
|
|
value);
|
|
|
|
return pci_generic_config_write(bus, devfn, where, size, value);
|
|
}
|
|
|
|
static struct pci_ops tegra_pcie_ops = {
|
|
.map_bus = tegra_pcie_map_bus,
|
|
.read = tegra_pcie_config_read,
|
|
.write = tegra_pcie_config_write,
|
|
};
|
|
|
|
static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
|
|
{
|
|
const struct tegra_pcie_soc *soc = port->pcie->soc;
|
|
unsigned long ret = 0;
|
|
|
|
switch (port->index) {
|
|
case 0:
|
|
ret = AFI_PEX0_CTRL;
|
|
break;
|
|
|
|
case 1:
|
|
ret = AFI_PEX1_CTRL;
|
|
break;
|
|
|
|
case 2:
|
|
ret = soc->afi_pex2_ctrl;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
|
|
{
|
|
unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
|
|
unsigned long value;
|
|
|
|
/* pulse reset signal */
|
|
if (port->reset_gpio) {
|
|
gpiod_set_value(port->reset_gpio, 1);
|
|
} else {
|
|
value = afi_readl(port->pcie, ctrl);
|
|
value &= ~AFI_PEX_CTRL_RST;
|
|
afi_writel(port->pcie, value, ctrl);
|
|
}
|
|
|
|
usleep_range(1000, 2000);
|
|
|
|
if (port->reset_gpio) {
|
|
gpiod_set_value(port->reset_gpio, 0);
|
|
} else {
|
|
value = afi_readl(port->pcie, ctrl);
|
|
value |= AFI_PEX_CTRL_RST;
|
|
afi_writel(port->pcie, value, ctrl);
|
|
}
|
|
}
|
|
|
|
static void tegra_pcie_enable_rp_features(struct tegra_pcie_port *port)
|
|
{
|
|
const struct tegra_pcie_soc *soc = port->pcie->soc;
|
|
u32 value;
|
|
|
|
/* Enable AER capability */
|
|
value = readl(port->base + RP_VEND_CTL1);
|
|
value |= RP_VEND_CTL1_ERPT;
|
|
writel(value, port->base + RP_VEND_CTL1);
|
|
|
|
/* Optimal settings to enhance bandwidth */
|
|
value = readl(port->base + RP_VEND_XP);
|
|
value |= RP_VEND_XP_OPPORTUNISTIC_ACK;
|
|
value |= RP_VEND_XP_OPPORTUNISTIC_UPDATEFC;
|
|
writel(value, port->base + RP_VEND_XP);
|
|
|
|
/*
|
|
* LTSSM will wait for DLLP to finish before entering L1 or L2,
|
|
* to avoid truncation of PM messages which results in receiver errors
|
|
*/
|
|
value = readl(port->base + RP_VEND_XP_BIST);
|
|
value |= RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE;
|
|
writel(value, port->base + RP_VEND_XP_BIST);
|
|
|
|
value = readl(port->base + RP_PRIV_MISC);
|
|
value |= RP_PRIV_MISC_CTLR_CLK_CLAMP_ENABLE;
|
|
value |= RP_PRIV_MISC_TMS_CLK_CLAMP_ENABLE;
|
|
|
|
if (soc->update_clamp_threshold) {
|
|
value &= ~(RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD_MASK |
|
|
RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD_MASK);
|
|
value |= RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD |
|
|
RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD;
|
|
}
|
|
|
|
writel(value, port->base + RP_PRIV_MISC);
|
|
}
|
|
|
|
static void tegra_pcie_program_ectl_settings(struct tegra_pcie_port *port)
|
|
{
|
|
const struct tegra_pcie_soc *soc = port->pcie->soc;
|
|
u32 value;
|
|
|
|
value = readl(port->base + RP_ECTL_2_R1);
|
|
value &= ~RP_ECTL_2_R1_RX_CTLE_1C_MASK;
|
|
value |= soc->ectl.regs.rp_ectl_2_r1;
|
|
writel(value, port->base + RP_ECTL_2_R1);
|
|
|
|
value = readl(port->base + RP_ECTL_4_R1);
|
|
value &= ~RP_ECTL_4_R1_RX_CDR_CTRL_1C_MASK;
|
|
value |= soc->ectl.regs.rp_ectl_4_r1 <<
|
|
RP_ECTL_4_R1_RX_CDR_CTRL_1C_SHIFT;
|
|
writel(value, port->base + RP_ECTL_4_R1);
|
|
|
|
value = readl(port->base + RP_ECTL_5_R1);
|
|
value &= ~RP_ECTL_5_R1_RX_EQ_CTRL_L_1C_MASK;
|
|
value |= soc->ectl.regs.rp_ectl_5_r1;
|
|
writel(value, port->base + RP_ECTL_5_R1);
|
|
|
|
value = readl(port->base + RP_ECTL_6_R1);
|
|
value &= ~RP_ECTL_6_R1_RX_EQ_CTRL_H_1C_MASK;
|
|
value |= soc->ectl.regs.rp_ectl_6_r1;
|
|
writel(value, port->base + RP_ECTL_6_R1);
|
|
|
|
value = readl(port->base + RP_ECTL_2_R2);
|
|
value &= ~RP_ECTL_2_R2_RX_CTLE_1C_MASK;
|
|
value |= soc->ectl.regs.rp_ectl_2_r2;
|
|
writel(value, port->base + RP_ECTL_2_R2);
|
|
|
|
value = readl(port->base + RP_ECTL_4_R2);
|
|
value &= ~RP_ECTL_4_R2_RX_CDR_CTRL_1C_MASK;
|
|
value |= soc->ectl.regs.rp_ectl_4_r2 <<
|
|
RP_ECTL_4_R2_RX_CDR_CTRL_1C_SHIFT;
|
|
writel(value, port->base + RP_ECTL_4_R2);
|
|
|
|
value = readl(port->base + RP_ECTL_5_R2);
|
|
value &= ~RP_ECTL_5_R2_RX_EQ_CTRL_L_1C_MASK;
|
|
value |= soc->ectl.regs.rp_ectl_5_r2;
|
|
writel(value, port->base + RP_ECTL_5_R2);
|
|
|
|
value = readl(port->base + RP_ECTL_6_R2);
|
|
value &= ~RP_ECTL_6_R2_RX_EQ_CTRL_H_1C_MASK;
|
|
value |= soc->ectl.regs.rp_ectl_6_r2;
|
|
writel(value, port->base + RP_ECTL_6_R2);
|
|
}
|
|
|
|
static void tegra_pcie_apply_sw_fixup(struct tegra_pcie_port *port)
|
|
{
|
|
const struct tegra_pcie_soc *soc = port->pcie->soc;
|
|
u32 value;
|
|
|
|
/*
|
|
* Sometimes link speed change from Gen2 to Gen1 fails due to
|
|
* instability in deskew logic on lane-0. Increase the deskew
|
|
* retry time to resolve this issue.
|
|
*/
|
|
if (soc->program_deskew_time) {
|
|
value = readl(port->base + RP_VEND_CTL0);
|
|
value &= ~RP_VEND_CTL0_DSK_RST_PULSE_WIDTH_MASK;
|
|
value |= RP_VEND_CTL0_DSK_RST_PULSE_WIDTH;
|
|
writel(value, port->base + RP_VEND_CTL0);
|
|
}
|
|
|
|
if (soc->update_fc_timer) {
|
|
value = readl(port->base + RP_VEND_XP);
|
|
value &= ~RP_VEND_XP_UPDATE_FC_THRESHOLD_MASK;
|
|
value |= soc->update_fc_threshold;
|
|
writel(value, port->base + RP_VEND_XP);
|
|
}
|
|
|
|
/*
|
|
* PCIe link doesn't come up with few legacy PCIe endpoints if
|
|
* root port advertises both Gen-1 and Gen-2 speeds in Tegra.
|
|
* Hence, the strategy followed here is to initially advertise
|
|
* only Gen-1 and after link is up, retrain link to Gen-2 speed
|
|
*/
|
|
value = readl(port->base + RP_LINK_CONTROL_STATUS_2);
|
|
value &= ~PCI_EXP_LNKSTA_CLS;
|
|
value |= PCI_EXP_LNKSTA_CLS_2_5GB;
|
|
writel(value, port->base + RP_LINK_CONTROL_STATUS_2);
|
|
}
|
|
|
|
static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
|
|
{
|
|
unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
|
|
const struct tegra_pcie_soc *soc = port->pcie->soc;
|
|
unsigned long value;
|
|
|
|
/* enable reference clock */
|
|
value = afi_readl(port->pcie, ctrl);
|
|
value |= AFI_PEX_CTRL_REFCLK_EN;
|
|
|
|
if (soc->has_pex_clkreq_en)
|
|
value |= AFI_PEX_CTRL_CLKREQ_EN;
|
|
|
|
value |= AFI_PEX_CTRL_OVERRIDE_EN;
|
|
|
|
afi_writel(port->pcie, value, ctrl);
|
|
|
|
tegra_pcie_port_reset(port);
|
|
|
|
if (soc->force_pca_enable) {
|
|
value = readl(port->base + RP_VEND_CTL2);
|
|
value |= RP_VEND_CTL2_PCA_ENABLE;
|
|
writel(value, port->base + RP_VEND_CTL2);
|
|
}
|
|
|
|
tegra_pcie_enable_rp_features(port);
|
|
|
|
if (soc->ectl.enable)
|
|
tegra_pcie_program_ectl_settings(port);
|
|
|
|
tegra_pcie_apply_sw_fixup(port);
|
|
}
|
|
|
|
static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
|
|
{
|
|
unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
|
|
const struct tegra_pcie_soc *soc = port->pcie->soc;
|
|
unsigned long value;
|
|
|
|
/* assert port reset */
|
|
value = afi_readl(port->pcie, ctrl);
|
|
value &= ~AFI_PEX_CTRL_RST;
|
|
afi_writel(port->pcie, value, ctrl);
|
|
|
|
/* disable reference clock */
|
|
value = afi_readl(port->pcie, ctrl);
|
|
|
|
if (soc->has_pex_clkreq_en)
|
|
value &= ~AFI_PEX_CTRL_CLKREQ_EN;
|
|
|
|
value &= ~AFI_PEX_CTRL_REFCLK_EN;
|
|
afi_writel(port->pcie, value, ctrl);
|
|
|
|
/* disable PCIe port and set CLKREQ# as GPIO to allow PLLE power down */
|
|
value = afi_readl(port->pcie, AFI_PCIE_CONFIG);
|
|
value |= AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
|
|
value |= AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO(port->index);
|
|
afi_writel(port->pcie, value, AFI_PCIE_CONFIG);
|
|
}
|
|
|
|
static void tegra_pcie_port_free(struct tegra_pcie_port *port)
|
|
{
|
|
struct tegra_pcie *pcie = port->pcie;
|
|
struct device *dev = pcie->dev;
|
|
|
|
devm_iounmap(dev, port->base);
|
|
devm_release_mem_region(dev, port->regs.start,
|
|
resource_size(&port->regs));
|
|
list_del(&port->list);
|
|
devm_kfree(dev, port);
|
|
}
|
|
|
|
/* Tegra PCIE root complex wrongly reports device class */
|
|
static void tegra_pcie_fixup_class(struct pci_dev *dev)
|
|
{
|
|
dev->class = PCI_CLASS_BRIDGE_PCI_NORMAL;
|
|
}
|
|
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
|
|
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
|
|
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class);
|
|
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class);
|
|
|
|
/* Tegra20 and Tegra30 PCIE requires relaxed ordering */
|
|
static void tegra_pcie_relax_enable(struct pci_dev *dev)
|
|
{
|
|
pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
|
|
}
|
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_relax_enable);
|
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_relax_enable);
|
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_relax_enable);
|
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_relax_enable);
|
|
|
|
static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
|
|
{
|
|
struct tegra_pcie *pcie = pdev->bus->sysdata;
|
|
int irq;
|
|
|
|
tegra_cpuidle_pcie_irqs_in_use();
|
|
|
|
irq = of_irq_parse_and_map_pci(pdev, slot, pin);
|
|
if (!irq)
|
|
irq = pcie->irq;
|
|
|
|
return irq;
|
|
}
|
|
|
|
static irqreturn_t tegra_pcie_isr(int irq, void *arg)
|
|
{
|
|
static const char * const err_msg[] = {
|
|
"Unknown",
|
|
"AXI slave error",
|
|
"AXI decode error",
|
|
"Target abort",
|
|
"Master abort",
|
|
"Invalid write",
|
|
"Legacy interrupt",
|
|
"Response decoding error",
|
|
"AXI response decoding error",
|
|
"Transaction timeout",
|
|
"Slot present pin change",
|
|
"Slot clock request change",
|
|
"TMS clock ramp change",
|
|
"TMS ready for power down",
|
|
"Peer2Peer error",
|
|
};
|
|
struct tegra_pcie *pcie = arg;
|
|
struct device *dev = pcie->dev;
|
|
u32 code, signature;
|
|
|
|
code = afi_readl(pcie, AFI_INTR_CODE) & AFI_INTR_CODE_MASK;
|
|
signature = afi_readl(pcie, AFI_INTR_SIGNATURE);
|
|
afi_writel(pcie, 0, AFI_INTR_CODE);
|
|
|
|
if (code == AFI_INTR_LEGACY)
|
|
return IRQ_NONE;
|
|
|
|
if (code >= ARRAY_SIZE(err_msg))
|
|
code = 0;
|
|
|
|
/*
|
|
* do not pollute kernel log with master abort reports since they
|
|
* happen a lot during enumeration
|
|
*/
|
|
if (code == AFI_INTR_MASTER_ABORT || code == AFI_INTR_PE_PRSNT_SENSE)
|
|
dev_dbg(dev, "%s, signature: %08x\n", err_msg[code], signature);
|
|
else
|
|
dev_err(dev, "%s, signature: %08x\n", err_msg[code], signature);
|
|
|
|
if (code == AFI_INTR_TARGET_ABORT || code == AFI_INTR_MASTER_ABORT ||
|
|
code == AFI_INTR_FPCI_DECODE_ERROR) {
|
|
u32 fpci = afi_readl(pcie, AFI_UPPER_FPCI_ADDRESS) & 0xff;
|
|
u64 address = (u64)fpci << 32 | (signature & 0xfffffffc);
|
|
|
|
if (code == AFI_INTR_MASTER_ABORT)
|
|
dev_dbg(dev, " FPCI address: %10llx\n", address);
|
|
else
|
|
dev_err(dev, " FPCI address: %10llx\n", address);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* FPCI map is as follows:
|
|
* - 0xfdfc000000: I/O space
|
|
* - 0xfdfe000000: type 0 configuration space
|
|
* - 0xfdff000000: type 1 configuration space
|
|
* - 0xfe00000000: type 0 extended configuration space
|
|
* - 0xfe10000000: type 1 extended configuration space
|
|
*/
|
|
static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
|
|
{
|
|
u32 size;
|
|
struct resource_entry *entry;
|
|
struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
|
|
|
|
/* Bar 0: type 1 extended configuration space */
|
|
size = resource_size(&pcie->cs);
|
|
afi_writel(pcie, pcie->cs.start, AFI_AXI_BAR0_START);
|
|
afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ);
|
|
|
|
resource_list_for_each_entry(entry, &bridge->windows) {
|
|
u32 fpci_bar, axi_address;
|
|
struct resource *res = entry->res;
|
|
|
|
size = resource_size(res);
|
|
|
|
switch (resource_type(res)) {
|
|
case IORESOURCE_IO:
|
|
/* Bar 1: downstream IO bar */
|
|
fpci_bar = 0xfdfc0000;
|
|
axi_address = pci_pio_to_address(res->start);
|
|
afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
|
|
afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
|
|
afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
|
|
break;
|
|
case IORESOURCE_MEM:
|
|
fpci_bar = (((res->start >> 12) & 0x0fffffff) << 4) | 0x1;
|
|
axi_address = res->start;
|
|
|
|
if (res->flags & IORESOURCE_PREFETCH) {
|
|
/* Bar 2: prefetchable memory BAR */
|
|
afi_writel(pcie, axi_address, AFI_AXI_BAR2_START);
|
|
afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
|
|
afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2);
|
|
|
|
} else {
|
|
/* Bar 3: non prefetchable memory BAR */
|
|
afi_writel(pcie, axi_address, AFI_AXI_BAR3_START);
|
|
afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
|
|
afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* NULL out the remaining BARs as they are not used */
|
|
afi_writel(pcie, 0, AFI_AXI_BAR4_START);
|
|
afi_writel(pcie, 0, AFI_AXI_BAR4_SZ);
|
|
afi_writel(pcie, 0, AFI_FPCI_BAR4);
|
|
|
|
afi_writel(pcie, 0, AFI_AXI_BAR5_START);
|
|
afi_writel(pcie, 0, AFI_AXI_BAR5_SZ);
|
|
afi_writel(pcie, 0, AFI_FPCI_BAR5);
|
|
|
|
if (pcie->soc->has_cache_bars) {
|
|
/* map all upstream transactions as uncached */
|
|
afi_writel(pcie, 0, AFI_CACHE_BAR0_ST);
|
|
afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
|
|
afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
|
|
afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
|
|
}
|
|
|
|
/* MSI translations are setup only when needed */
|
|
afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST);
|
|
afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
|
|
afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST);
|
|
afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
|
|
}
|
|
|
|
static int tegra_pcie_pll_wait(struct tegra_pcie *pcie, unsigned long timeout)
|
|
{
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
u32 value;
|
|
|
|
timeout = jiffies + msecs_to_jiffies(timeout);
|
|
|
|
while (time_before(jiffies, timeout)) {
|
|
value = pads_readl(pcie, soc->pads_pll_ctl);
|
|
if (value & PADS_PLL_CTL_LOCKDET)
|
|
return 0;
|
|
}
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int tegra_pcie_phy_enable(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
u32 value;
|
|
int err;
|
|
|
|
/* initialize internal PHY, enable up to 16 PCIE lanes */
|
|
pads_writel(pcie, 0x0, PADS_CTL_SEL);
|
|
|
|
/* override IDDQ to 1 on all 4 lanes */
|
|
value = pads_readl(pcie, PADS_CTL);
|
|
value |= PADS_CTL_IDDQ_1L;
|
|
pads_writel(pcie, value, PADS_CTL);
|
|
|
|
/*
|
|
* Set up PHY PLL inputs select PLLE output as refclock,
|
|
* set TX ref sel to div10 (not div5).
|
|
*/
|
|
value = pads_readl(pcie, soc->pads_pll_ctl);
|
|
value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
|
|
value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel;
|
|
pads_writel(pcie, value, soc->pads_pll_ctl);
|
|
|
|
/* reset PLL */
|
|
value = pads_readl(pcie, soc->pads_pll_ctl);
|
|
value &= ~PADS_PLL_CTL_RST_B4SM;
|
|
pads_writel(pcie, value, soc->pads_pll_ctl);
|
|
|
|
usleep_range(20, 100);
|
|
|
|
/* take PLL out of reset */
|
|
value = pads_readl(pcie, soc->pads_pll_ctl);
|
|
value |= PADS_PLL_CTL_RST_B4SM;
|
|
pads_writel(pcie, value, soc->pads_pll_ctl);
|
|
|
|
/* wait for the PLL to lock */
|
|
err = tegra_pcie_pll_wait(pcie, 500);
|
|
if (err < 0) {
|
|
dev_err(dev, "PLL failed to lock: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
/* turn off IDDQ override */
|
|
value = pads_readl(pcie, PADS_CTL);
|
|
value &= ~PADS_CTL_IDDQ_1L;
|
|
pads_writel(pcie, value, PADS_CTL);
|
|
|
|
/* enable TX/RX data */
|
|
value = pads_readl(pcie, PADS_CTL);
|
|
value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L;
|
|
pads_writel(pcie, value, PADS_CTL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_pcie_phy_disable(struct tegra_pcie *pcie)
|
|
{
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
u32 value;
|
|
|
|
/* disable TX/RX data */
|
|
value = pads_readl(pcie, PADS_CTL);
|
|
value &= ~(PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L);
|
|
pads_writel(pcie, value, PADS_CTL);
|
|
|
|
/* override IDDQ */
|
|
value = pads_readl(pcie, PADS_CTL);
|
|
value |= PADS_CTL_IDDQ_1L;
|
|
pads_writel(pcie, value, PADS_CTL);
|
|
|
|
/* reset PLL */
|
|
value = pads_readl(pcie, soc->pads_pll_ctl);
|
|
value &= ~PADS_PLL_CTL_RST_B4SM;
|
|
pads_writel(pcie, value, soc->pads_pll_ctl);
|
|
|
|
usleep_range(20, 100);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_pcie_port_phy_power_on(struct tegra_pcie_port *port)
|
|
{
|
|
struct device *dev = port->pcie->dev;
|
|
unsigned int i;
|
|
int err;
|
|
|
|
for (i = 0; i < port->lanes; i++) {
|
|
err = phy_power_on(port->phys[i]);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to power on PHY#%u: %d\n", i, err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_pcie_port_phy_power_off(struct tegra_pcie_port *port)
|
|
{
|
|
struct device *dev = port->pcie->dev;
|
|
unsigned int i;
|
|
int err;
|
|
|
|
for (i = 0; i < port->lanes; i++) {
|
|
err = phy_power_off(port->phys[i]);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to power off PHY#%u: %d\n", i,
|
|
err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_pcie_phy_power_on(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct tegra_pcie_port *port;
|
|
int err;
|
|
|
|
if (pcie->legacy_phy) {
|
|
if (pcie->phy)
|
|
err = phy_power_on(pcie->phy);
|
|
else
|
|
err = tegra_pcie_phy_enable(pcie);
|
|
|
|
if (err < 0)
|
|
dev_err(dev, "failed to power on PHY: %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
list_for_each_entry(port, &pcie->ports, list) {
|
|
err = tegra_pcie_port_phy_power_on(port);
|
|
if (err < 0) {
|
|
dev_err(dev,
|
|
"failed to power on PCIe port %u PHY: %d\n",
|
|
port->index, err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_pcie_phy_power_off(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct tegra_pcie_port *port;
|
|
int err;
|
|
|
|
if (pcie->legacy_phy) {
|
|
if (pcie->phy)
|
|
err = phy_power_off(pcie->phy);
|
|
else
|
|
err = tegra_pcie_phy_disable(pcie);
|
|
|
|
if (err < 0)
|
|
dev_err(dev, "failed to power off PHY: %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
list_for_each_entry(port, &pcie->ports, list) {
|
|
err = tegra_pcie_port_phy_power_off(port);
|
|
if (err < 0) {
|
|
dev_err(dev,
|
|
"failed to power off PCIe port %u PHY: %d\n",
|
|
port->index, err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tegra_pcie_enable_controller(struct tegra_pcie *pcie)
|
|
{
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
struct tegra_pcie_port *port;
|
|
unsigned long value;
|
|
|
|
/* enable PLL power down */
|
|
if (pcie->phy) {
|
|
value = afi_readl(pcie, AFI_PLLE_CONTROL);
|
|
value &= ~AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL;
|
|
value |= AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN;
|
|
afi_writel(pcie, value, AFI_PLLE_CONTROL);
|
|
}
|
|
|
|
/* power down PCIe slot clock bias pad */
|
|
if (soc->has_pex_bias_ctrl)
|
|
afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);
|
|
|
|
/* configure mode and disable all ports */
|
|
value = afi_readl(pcie, AFI_PCIE_CONFIG);
|
|
value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
|
|
value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config;
|
|
value |= AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO_ALL;
|
|
|
|
list_for_each_entry(port, &pcie->ports, list) {
|
|
value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
|
|
value &= ~AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO(port->index);
|
|
}
|
|
|
|
afi_writel(pcie, value, AFI_PCIE_CONFIG);
|
|
|
|
if (soc->has_gen2) {
|
|
value = afi_readl(pcie, AFI_FUSE);
|
|
value &= ~AFI_FUSE_PCIE_T0_GEN2_DIS;
|
|
afi_writel(pcie, value, AFI_FUSE);
|
|
} else {
|
|
value = afi_readl(pcie, AFI_FUSE);
|
|
value |= AFI_FUSE_PCIE_T0_GEN2_DIS;
|
|
afi_writel(pcie, value, AFI_FUSE);
|
|
}
|
|
|
|
/* Disable AFI dynamic clock gating and enable PCIe */
|
|
value = afi_readl(pcie, AFI_CONFIGURATION);
|
|
value |= AFI_CONFIGURATION_EN_FPCI;
|
|
value |= AFI_CONFIGURATION_CLKEN_OVERRIDE;
|
|
afi_writel(pcie, value, AFI_CONFIGURATION);
|
|
|
|
value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR |
|
|
AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR |
|
|
AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR;
|
|
|
|
if (soc->has_intr_prsnt_sense)
|
|
value |= AFI_INTR_EN_PRSNT_SENSE;
|
|
|
|
afi_writel(pcie, value, AFI_AFI_INTR_ENABLE);
|
|
afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE);
|
|
|
|
/* don't enable MSI for now, only when needed */
|
|
afi_writel(pcie, AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK);
|
|
|
|
/* disable all exceptions */
|
|
afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS);
|
|
}
|
|
|
|
static void tegra_pcie_power_off(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
int err;
|
|
|
|
reset_control_assert(pcie->afi_rst);
|
|
|
|
clk_disable_unprepare(pcie->pll_e);
|
|
if (soc->has_cml_clk)
|
|
clk_disable_unprepare(pcie->cml_clk);
|
|
clk_disable_unprepare(pcie->afi_clk);
|
|
|
|
if (!dev->pm_domain)
|
|
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
|
|
|
|
err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
|
|
if (err < 0)
|
|
dev_warn(dev, "failed to disable regulators: %d\n", err);
|
|
}
|
|
|
|
static int tegra_pcie_power_on(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
int err;
|
|
|
|
reset_control_assert(pcie->pcie_xrst);
|
|
reset_control_assert(pcie->afi_rst);
|
|
reset_control_assert(pcie->pex_rst);
|
|
|
|
if (!dev->pm_domain)
|
|
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
|
|
|
|
/* enable regulators */
|
|
err = regulator_bulk_enable(pcie->num_supplies, pcie->supplies);
|
|
if (err < 0)
|
|
dev_err(dev, "failed to enable regulators: %d\n", err);
|
|
|
|
if (!dev->pm_domain) {
|
|
err = tegra_powergate_power_on(TEGRA_POWERGATE_PCIE);
|
|
if (err) {
|
|
dev_err(dev, "failed to power ungate: %d\n", err);
|
|
goto regulator_disable;
|
|
}
|
|
err = tegra_powergate_remove_clamping(TEGRA_POWERGATE_PCIE);
|
|
if (err) {
|
|
dev_err(dev, "failed to remove clamp: %d\n", err);
|
|
goto powergate;
|
|
}
|
|
}
|
|
|
|
err = clk_prepare_enable(pcie->afi_clk);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to enable AFI clock: %d\n", err);
|
|
goto powergate;
|
|
}
|
|
|
|
if (soc->has_cml_clk) {
|
|
err = clk_prepare_enable(pcie->cml_clk);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to enable CML clock: %d\n", err);
|
|
goto disable_afi_clk;
|
|
}
|
|
}
|
|
|
|
err = clk_prepare_enable(pcie->pll_e);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to enable PLLE clock: %d\n", err);
|
|
goto disable_cml_clk;
|
|
}
|
|
|
|
reset_control_deassert(pcie->afi_rst);
|
|
|
|
return 0;
|
|
|
|
disable_cml_clk:
|
|
if (soc->has_cml_clk)
|
|
clk_disable_unprepare(pcie->cml_clk);
|
|
disable_afi_clk:
|
|
clk_disable_unprepare(pcie->afi_clk);
|
|
powergate:
|
|
if (!dev->pm_domain)
|
|
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
|
|
regulator_disable:
|
|
regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void tegra_pcie_apply_pad_settings(struct tegra_pcie *pcie)
|
|
{
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
|
|
/* Configure the reference clock driver */
|
|
pads_writel(pcie, soc->pads_refclk_cfg0, PADS_REFCLK_CFG0);
|
|
|
|
if (soc->num_ports > 2)
|
|
pads_writel(pcie, soc->pads_refclk_cfg1, PADS_REFCLK_CFG1);
|
|
}
|
|
|
|
static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
|
|
pcie->pex_clk = devm_clk_get(dev, "pex");
|
|
if (IS_ERR(pcie->pex_clk))
|
|
return PTR_ERR(pcie->pex_clk);
|
|
|
|
pcie->afi_clk = devm_clk_get(dev, "afi");
|
|
if (IS_ERR(pcie->afi_clk))
|
|
return PTR_ERR(pcie->afi_clk);
|
|
|
|
pcie->pll_e = devm_clk_get(dev, "pll_e");
|
|
if (IS_ERR(pcie->pll_e))
|
|
return PTR_ERR(pcie->pll_e);
|
|
|
|
if (soc->has_cml_clk) {
|
|
pcie->cml_clk = devm_clk_get(dev, "cml");
|
|
if (IS_ERR(pcie->cml_clk))
|
|
return PTR_ERR(pcie->cml_clk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_pcie_resets_get(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
|
|
pcie->pex_rst = devm_reset_control_get_exclusive(dev, "pex");
|
|
if (IS_ERR(pcie->pex_rst))
|
|
return PTR_ERR(pcie->pex_rst);
|
|
|
|
pcie->afi_rst = devm_reset_control_get_exclusive(dev, "afi");
|
|
if (IS_ERR(pcie->afi_rst))
|
|
return PTR_ERR(pcie->afi_rst);
|
|
|
|
pcie->pcie_xrst = devm_reset_control_get_exclusive(dev, "pcie_x");
|
|
if (IS_ERR(pcie->pcie_xrst))
|
|
return PTR_ERR(pcie->pcie_xrst);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_pcie_phys_get_legacy(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
int err;
|
|
|
|
pcie->phy = devm_phy_optional_get(dev, "pcie");
|
|
if (IS_ERR(pcie->phy)) {
|
|
err = PTR_ERR(pcie->phy);
|
|
dev_err(dev, "failed to get PHY: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = phy_init(pcie->phy);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to initialize PHY: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
pcie->legacy_phy = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct phy *devm_of_phy_optional_get_index(struct device *dev,
|
|
struct device_node *np,
|
|
const char *consumer,
|
|
unsigned int index)
|
|
{
|
|
struct phy *phy;
|
|
char *name;
|
|
|
|
name = kasprintf(GFP_KERNEL, "%s-%u", consumer, index);
|
|
if (!name)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
phy = devm_of_phy_get(dev, np, name);
|
|
kfree(name);
|
|
|
|
if (PTR_ERR(phy) == -ENODEV)
|
|
phy = NULL;
|
|
|
|
return phy;
|
|
}
|
|
|
|
static int tegra_pcie_port_get_phys(struct tegra_pcie_port *port)
|
|
{
|
|
struct device *dev = port->pcie->dev;
|
|
struct phy *phy;
|
|
unsigned int i;
|
|
int err;
|
|
|
|
port->phys = devm_kcalloc(dev, sizeof(phy), port->lanes, GFP_KERNEL);
|
|
if (!port->phys)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < port->lanes; i++) {
|
|
phy = devm_of_phy_optional_get_index(dev, port->np, "pcie", i);
|
|
if (IS_ERR(phy)) {
|
|
dev_err(dev, "failed to get PHY#%u: %ld\n", i,
|
|
PTR_ERR(phy));
|
|
return PTR_ERR(phy);
|
|
}
|
|
|
|
err = phy_init(phy);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to initialize PHY#%u: %d\n", i,
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
port->phys[i] = phy;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra_pcie_phys_get(struct tegra_pcie *pcie)
|
|
{
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
struct device_node *np = pcie->dev->of_node;
|
|
struct tegra_pcie_port *port;
|
|
int err;
|
|
|
|
if (!soc->has_gen2 || of_find_property(np, "phys", NULL) != NULL)
|
|
return tegra_pcie_phys_get_legacy(pcie);
|
|
|
|
list_for_each_entry(port, &pcie->ports, list) {
|
|
err = tegra_pcie_port_get_phys(port);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tegra_pcie_phys_put(struct tegra_pcie *pcie)
|
|
{
|
|
struct tegra_pcie_port *port;
|
|
struct device *dev = pcie->dev;
|
|
int err, i;
|
|
|
|
if (pcie->legacy_phy) {
|
|
err = phy_exit(pcie->phy);
|
|
if (err < 0)
|
|
dev_err(dev, "failed to teardown PHY: %d\n", err);
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry(port, &pcie->ports, list) {
|
|
for (i = 0; i < port->lanes; i++) {
|
|
err = phy_exit(port->phys[i]);
|
|
if (err < 0)
|
|
dev_err(dev, "failed to teardown PHY#%u: %d\n",
|
|
i, err);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct resource *res;
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
int err;
|
|
|
|
err = tegra_pcie_clocks_get(pcie);
|
|
if (err) {
|
|
dev_err(dev, "failed to get clocks: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = tegra_pcie_resets_get(pcie);
|
|
if (err) {
|
|
dev_err(dev, "failed to get resets: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
if (soc->program_uphy) {
|
|
err = tegra_pcie_phys_get(pcie);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to get PHYs: %d\n", err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
pcie->pads = devm_platform_ioremap_resource_byname(pdev, "pads");
|
|
if (IS_ERR(pcie->pads)) {
|
|
err = PTR_ERR(pcie->pads);
|
|
goto phys_put;
|
|
}
|
|
|
|
pcie->afi = devm_platform_ioremap_resource_byname(pdev, "afi");
|
|
if (IS_ERR(pcie->afi)) {
|
|
err = PTR_ERR(pcie->afi);
|
|
goto phys_put;
|
|
}
|
|
|
|
/* request configuration space, but remap later, on demand */
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs");
|
|
if (!res) {
|
|
err = -EADDRNOTAVAIL;
|
|
goto phys_put;
|
|
}
|
|
|
|
pcie->cs = *res;
|
|
|
|
/* constrain configuration space to 4 KiB */
|
|
pcie->cs.end = pcie->cs.start + SZ_4K - 1;
|
|
|
|
pcie->cfg = devm_ioremap_resource(dev, &pcie->cs);
|
|
if (IS_ERR(pcie->cfg)) {
|
|
err = PTR_ERR(pcie->cfg);
|
|
goto phys_put;
|
|
}
|
|
|
|
/* request interrupt */
|
|
err = platform_get_irq_byname(pdev, "intr");
|
|
if (err < 0)
|
|
goto phys_put;
|
|
|
|
pcie->irq = err;
|
|
|
|
err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie);
|
|
if (err) {
|
|
dev_err(dev, "failed to register IRQ: %d\n", err);
|
|
goto phys_put;
|
|
}
|
|
|
|
return 0;
|
|
|
|
phys_put:
|
|
if (soc->program_uphy)
|
|
tegra_pcie_phys_put(pcie);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
|
|
{
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
|
|
if (pcie->irq > 0)
|
|
free_irq(pcie->irq, pcie);
|
|
|
|
if (soc->program_uphy)
|
|
tegra_pcie_phys_put(pcie);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tegra_pcie_pme_turnoff(struct tegra_pcie_port *port)
|
|
{
|
|
struct tegra_pcie *pcie = port->pcie;
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
int err;
|
|
u32 val;
|
|
u8 ack_bit;
|
|
|
|
val = afi_readl(pcie, AFI_PCIE_PME);
|
|
val |= (0x1 << soc->ports[port->index].pme.turnoff_bit);
|
|
afi_writel(pcie, val, AFI_PCIE_PME);
|
|
|
|
ack_bit = soc->ports[port->index].pme.ack_bit;
|
|
err = readl_poll_timeout(pcie->afi + AFI_PCIE_PME, val,
|
|
val & (0x1 << ack_bit), 1, PME_ACK_TIMEOUT);
|
|
if (err)
|
|
dev_err(pcie->dev, "PME Ack is not received on port: %d\n",
|
|
port->index);
|
|
|
|
usleep_range(10000, 11000);
|
|
|
|
val = afi_readl(pcie, AFI_PCIE_PME);
|
|
val &= ~(0x1 << soc->ports[port->index].pme.turnoff_bit);
|
|
afi_writel(pcie, val, AFI_PCIE_PME);
|
|
}
|
|
|
|
static void tegra_pcie_msi_irq(struct irq_desc *desc)
|
|
{
|
|
struct tegra_pcie *pcie = irq_desc_get_handler_data(desc);
|
|
struct irq_chip *chip = irq_desc_get_chip(desc);
|
|
struct tegra_msi *msi = &pcie->msi;
|
|
struct device *dev = pcie->dev;
|
|
unsigned int i;
|
|
|
|
chained_irq_enter(chip, desc);
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
unsigned long reg = afi_readl(pcie, AFI_MSI_VEC(i));
|
|
|
|
while (reg) {
|
|
unsigned int offset = find_first_bit(®, 32);
|
|
unsigned int index = i * 32 + offset;
|
|
int ret;
|
|
|
|
ret = generic_handle_domain_irq(msi->domain->parent, index);
|
|
if (ret) {
|
|
/*
|
|
* that's weird who triggered this?
|
|
* just clear it
|
|
*/
|
|
dev_info(dev, "unexpected MSI\n");
|
|
afi_writel(pcie, BIT(index % 32), AFI_MSI_VEC(index));
|
|
}
|
|
|
|
/* see if there's any more pending in this vector */
|
|
reg = afi_readl(pcie, AFI_MSI_VEC(i));
|
|
}
|
|
}
|
|
|
|
chained_irq_exit(chip, desc);
|
|
}
|
|
|
|
static void tegra_msi_top_irq_ack(struct irq_data *d)
|
|
{
|
|
irq_chip_ack_parent(d);
|
|
}
|
|
|
|
static void tegra_msi_top_irq_mask(struct irq_data *d)
|
|
{
|
|
pci_msi_mask_irq(d);
|
|
irq_chip_mask_parent(d);
|
|
}
|
|
|
|
static void tegra_msi_top_irq_unmask(struct irq_data *d)
|
|
{
|
|
pci_msi_unmask_irq(d);
|
|
irq_chip_unmask_parent(d);
|
|
}
|
|
|
|
static struct irq_chip tegra_msi_top_chip = {
|
|
.name = "Tegra PCIe MSI",
|
|
.irq_ack = tegra_msi_top_irq_ack,
|
|
.irq_mask = tegra_msi_top_irq_mask,
|
|
.irq_unmask = tegra_msi_top_irq_unmask,
|
|
};
|
|
|
|
static void tegra_msi_irq_ack(struct irq_data *d)
|
|
{
|
|
struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
|
|
struct tegra_pcie *pcie = msi_to_pcie(msi);
|
|
unsigned int index = d->hwirq / 32;
|
|
|
|
/* clear the interrupt */
|
|
afi_writel(pcie, BIT(d->hwirq % 32), AFI_MSI_VEC(index));
|
|
}
|
|
|
|
static void tegra_msi_irq_mask(struct irq_data *d)
|
|
{
|
|
struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
|
|
struct tegra_pcie *pcie = msi_to_pcie(msi);
|
|
unsigned int index = d->hwirq / 32;
|
|
unsigned long flags;
|
|
u32 value;
|
|
|
|
spin_lock_irqsave(&msi->mask_lock, flags);
|
|
value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
|
|
value &= ~BIT(d->hwirq % 32);
|
|
afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
|
|
spin_unlock_irqrestore(&msi->mask_lock, flags);
|
|
}
|
|
|
|
static void tegra_msi_irq_unmask(struct irq_data *d)
|
|
{
|
|
struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
|
|
struct tegra_pcie *pcie = msi_to_pcie(msi);
|
|
unsigned int index = d->hwirq / 32;
|
|
unsigned long flags;
|
|
u32 value;
|
|
|
|
spin_lock_irqsave(&msi->mask_lock, flags);
|
|
value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
|
|
value |= BIT(d->hwirq % 32);
|
|
afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
|
|
spin_unlock_irqrestore(&msi->mask_lock, flags);
|
|
}
|
|
|
|
static int tegra_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void tegra_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
|
|
{
|
|
struct tegra_msi *msi = irq_data_get_irq_chip_data(data);
|
|
|
|
msg->address_lo = lower_32_bits(msi->phys);
|
|
msg->address_hi = upper_32_bits(msi->phys);
|
|
msg->data = data->hwirq;
|
|
}
|
|
|
|
static struct irq_chip tegra_msi_bottom_chip = {
|
|
.name = "Tegra MSI",
|
|
.irq_ack = tegra_msi_irq_ack,
|
|
.irq_mask = tegra_msi_irq_mask,
|
|
.irq_unmask = tegra_msi_irq_unmask,
|
|
.irq_set_affinity = tegra_msi_set_affinity,
|
|
.irq_compose_msi_msg = tegra_compose_msi_msg,
|
|
};
|
|
|
|
static int tegra_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs, void *args)
|
|
{
|
|
struct tegra_msi *msi = domain->host_data;
|
|
unsigned int i;
|
|
int hwirq;
|
|
|
|
mutex_lock(&msi->map_lock);
|
|
|
|
hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs));
|
|
|
|
mutex_unlock(&msi->map_lock);
|
|
|
|
if (hwirq < 0)
|
|
return -ENOSPC;
|
|
|
|
for (i = 0; i < nr_irqs; i++)
|
|
irq_domain_set_info(domain, virq + i, hwirq + i,
|
|
&tegra_msi_bottom_chip, domain->host_data,
|
|
handle_edge_irq, NULL, NULL);
|
|
|
|
tegra_cpuidle_pcie_irqs_in_use();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tegra_msi_domain_free(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs)
|
|
{
|
|
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
|
|
struct tegra_msi *msi = domain->host_data;
|
|
|
|
mutex_lock(&msi->map_lock);
|
|
|
|
bitmap_release_region(msi->used, d->hwirq, order_base_2(nr_irqs));
|
|
|
|
mutex_unlock(&msi->map_lock);
|
|
}
|
|
|
|
static const struct irq_domain_ops tegra_msi_domain_ops = {
|
|
.alloc = tegra_msi_domain_alloc,
|
|
.free = tegra_msi_domain_free,
|
|
};
|
|
|
|
static struct msi_domain_info tegra_msi_info = {
|
|
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
|
|
MSI_FLAG_PCI_MSIX),
|
|
.chip = &tegra_msi_top_chip,
|
|
};
|
|
|
|
static int tegra_allocate_domains(struct tegra_msi *msi)
|
|
{
|
|
struct tegra_pcie *pcie = msi_to_pcie(msi);
|
|
struct fwnode_handle *fwnode = dev_fwnode(pcie->dev);
|
|
struct irq_domain *parent;
|
|
|
|
parent = irq_domain_create_linear(fwnode, INT_PCI_MSI_NR,
|
|
&tegra_msi_domain_ops, msi);
|
|
if (!parent) {
|
|
dev_err(pcie->dev, "failed to create IRQ domain\n");
|
|
return -ENOMEM;
|
|
}
|
|
irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
|
|
|
|
msi->domain = pci_msi_create_irq_domain(fwnode, &tegra_msi_info, parent);
|
|
if (!msi->domain) {
|
|
dev_err(pcie->dev, "failed to create MSI domain\n");
|
|
irq_domain_remove(parent);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tegra_free_domains(struct tegra_msi *msi)
|
|
{
|
|
struct irq_domain *parent = msi->domain->parent;
|
|
|
|
irq_domain_remove(msi->domain);
|
|
irq_domain_remove(parent);
|
|
}
|
|
|
|
static int tegra_pcie_msi_setup(struct tegra_pcie *pcie)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(pcie->dev);
|
|
struct tegra_msi *msi = &pcie->msi;
|
|
struct device *dev = pcie->dev;
|
|
int err;
|
|
|
|
mutex_init(&msi->map_lock);
|
|
spin_lock_init(&msi->mask_lock);
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI)) {
|
|
err = tegra_allocate_domains(msi);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
err = platform_get_irq_byname(pdev, "msi");
|
|
if (err < 0)
|
|
goto free_irq_domain;
|
|
|
|
msi->irq = err;
|
|
|
|
irq_set_chained_handler_and_data(msi->irq, tegra_pcie_msi_irq, pcie);
|
|
|
|
/* Though the PCIe controller can address >32-bit address space, to
|
|
* facilitate endpoints that support only 32-bit MSI target address,
|
|
* the mask is set to 32-bit to make sure that MSI target address is
|
|
* always a 32-bit address
|
|
*/
|
|
err = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to set DMA coherent mask: %d\n", err);
|
|
goto free_irq;
|
|
}
|
|
|
|
msi->virt = dma_alloc_attrs(dev, PAGE_SIZE, &msi->phys, GFP_KERNEL,
|
|
DMA_ATTR_NO_KERNEL_MAPPING);
|
|
if (!msi->virt) {
|
|
dev_err(dev, "failed to allocate DMA memory for MSI\n");
|
|
err = -ENOMEM;
|
|
goto free_irq;
|
|
}
|
|
|
|
return 0;
|
|
|
|
free_irq:
|
|
irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
|
|
free_irq_domain:
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
tegra_free_domains(msi);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void tegra_pcie_enable_msi(struct tegra_pcie *pcie)
|
|
{
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
struct tegra_msi *msi = &pcie->msi;
|
|
u32 reg, msi_state[INT_PCI_MSI_NR / 32];
|
|
int i;
|
|
|
|
afi_writel(pcie, msi->phys >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
|
|
afi_writel(pcie, msi->phys, AFI_MSI_AXI_BAR_ST);
|
|
/* this register is in 4K increments */
|
|
afi_writel(pcie, 1, AFI_MSI_BAR_SZ);
|
|
|
|
/* Restore the MSI allocation state */
|
|
bitmap_to_arr32(msi_state, msi->used, INT_PCI_MSI_NR);
|
|
for (i = 0; i < ARRAY_SIZE(msi_state); i++)
|
|
afi_writel(pcie, msi_state[i], AFI_MSI_EN_VEC(i));
|
|
|
|
/* and unmask the MSI interrupt */
|
|
reg = afi_readl(pcie, AFI_INTR_MASK);
|
|
reg |= AFI_INTR_MASK_MSI_MASK;
|
|
afi_writel(pcie, reg, AFI_INTR_MASK);
|
|
}
|
|
|
|
static void tegra_pcie_msi_teardown(struct tegra_pcie *pcie)
|
|
{
|
|
struct tegra_msi *msi = &pcie->msi;
|
|
unsigned int i, irq;
|
|
|
|
dma_free_attrs(pcie->dev, PAGE_SIZE, msi->virt, msi->phys,
|
|
DMA_ATTR_NO_KERNEL_MAPPING);
|
|
|
|
for (i = 0; i < INT_PCI_MSI_NR; i++) {
|
|
irq = irq_find_mapping(msi->domain, i);
|
|
if (irq > 0)
|
|
irq_domain_free_irqs(irq, 1);
|
|
}
|
|
|
|
irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
tegra_free_domains(msi);
|
|
}
|
|
|
|
static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
|
|
{
|
|
u32 value;
|
|
|
|
/* mask the MSI interrupt */
|
|
value = afi_readl(pcie, AFI_INTR_MASK);
|
|
value &= ~AFI_INTR_MASK_MSI_MASK;
|
|
afi_writel(pcie, value, AFI_INTR_MASK);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tegra_pcie_disable_interrupts(struct tegra_pcie *pcie)
|
|
{
|
|
u32 value;
|
|
|
|
value = afi_readl(pcie, AFI_INTR_MASK);
|
|
value &= ~AFI_INTR_MASK_INT_MASK;
|
|
afi_writel(pcie, value, AFI_INTR_MASK);
|
|
}
|
|
|
|
static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
|
|
u32 *xbar)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct device_node *np = dev->of_node;
|
|
|
|
if (of_device_is_compatible(np, "nvidia,tegra186-pcie")) {
|
|
switch (lanes) {
|
|
case 0x010004:
|
|
dev_info(dev, "4x1, 1x1 configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_401;
|
|
return 0;
|
|
|
|
case 0x010102:
|
|
dev_info(dev, "2x1, 1X1, 1x1 configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211;
|
|
return 0;
|
|
|
|
case 0x010101:
|
|
dev_info(dev, "1x1, 1x1, 1x1 configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_111;
|
|
return 0;
|
|
|
|
default:
|
|
dev_info(dev, "wrong configuration updated in DT, "
|
|
"switching to default 2x1, 1x1, 1x1 "
|
|
"configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211;
|
|
return 0;
|
|
}
|
|
} else if (of_device_is_compatible(np, "nvidia,tegra124-pcie") ||
|
|
of_device_is_compatible(np, "nvidia,tegra210-pcie")) {
|
|
switch (lanes) {
|
|
case 0x0000104:
|
|
dev_info(dev, "4x1, 1x1 configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1;
|
|
return 0;
|
|
|
|
case 0x0000102:
|
|
dev_info(dev, "2x1, 1x1 configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1;
|
|
return 0;
|
|
}
|
|
} else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
|
|
switch (lanes) {
|
|
case 0x00000204:
|
|
dev_info(dev, "4x1, 2x1 configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420;
|
|
return 0;
|
|
|
|
case 0x00020202:
|
|
dev_info(dev, "2x3 configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222;
|
|
return 0;
|
|
|
|
case 0x00010104:
|
|
dev_info(dev, "4x1, 1x2 configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411;
|
|
return 0;
|
|
}
|
|
} else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
|
|
switch (lanes) {
|
|
case 0x00000004:
|
|
dev_info(dev, "single-mode configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
|
|
return 0;
|
|
|
|
case 0x00000202:
|
|
dev_info(dev, "dual-mode configuration\n");
|
|
*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Check whether a given set of supplies is available in a device tree node.
|
|
* This is used to check whether the new or the legacy device tree bindings
|
|
* should be used.
|
|
*/
|
|
static bool of_regulator_bulk_available(struct device_node *np,
|
|
struct regulator_bulk_data *supplies,
|
|
unsigned int num_supplies)
|
|
{
|
|
char property[32];
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < num_supplies; i++) {
|
|
snprintf(property, 32, "%s-supply", supplies[i].supply);
|
|
|
|
if (of_find_property(np, property, NULL) == NULL)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Old versions of the device tree binding for this device used a set of power
|
|
* supplies that didn't match the hardware inputs. This happened to work for a
|
|
* number of cases but is not future proof. However to preserve backwards-
|
|
* compatibility with old device trees, this function will try to use the old
|
|
* set of supplies.
|
|
*/
|
|
static int tegra_pcie_get_legacy_regulators(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct device_node *np = dev->of_node;
|
|
|
|
if (of_device_is_compatible(np, "nvidia,tegra30-pcie"))
|
|
pcie->num_supplies = 3;
|
|
else if (of_device_is_compatible(np, "nvidia,tegra20-pcie"))
|
|
pcie->num_supplies = 2;
|
|
|
|
if (pcie->num_supplies == 0) {
|
|
dev_err(dev, "device %pOF not supported in legacy mode\n", np);
|
|
return -ENODEV;
|
|
}
|
|
|
|
pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
|
|
sizeof(*pcie->supplies),
|
|
GFP_KERNEL);
|
|
if (!pcie->supplies)
|
|
return -ENOMEM;
|
|
|
|
pcie->supplies[0].supply = "pex-clk";
|
|
pcie->supplies[1].supply = "vdd";
|
|
|
|
if (pcie->num_supplies > 2)
|
|
pcie->supplies[2].supply = "avdd";
|
|
|
|
return devm_regulator_bulk_get(dev, pcie->num_supplies, pcie->supplies);
|
|
}
|
|
|
|
/*
|
|
* Obtains the list of regulators required for a particular generation of the
|
|
* IP block.
|
|
*
|
|
* This would've been nice to do simply by providing static tables for use
|
|
* with the regulator_bulk_*() API, but unfortunately Tegra30 is a bit quirky
|
|
* in that it has two pairs or AVDD_PEX and VDD_PEX supplies (PEXA and PEXB)
|
|
* and either seems to be optional depending on which ports are being used.
|
|
*/
|
|
static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct device_node *np = dev->of_node;
|
|
unsigned int i = 0;
|
|
|
|
if (of_device_is_compatible(np, "nvidia,tegra186-pcie")) {
|
|
pcie->num_supplies = 4;
|
|
|
|
pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
|
|
sizeof(*pcie->supplies),
|
|
GFP_KERNEL);
|
|
if (!pcie->supplies)
|
|
return -ENOMEM;
|
|
|
|
pcie->supplies[i++].supply = "dvdd-pex";
|
|
pcie->supplies[i++].supply = "hvdd-pex-pll";
|
|
pcie->supplies[i++].supply = "hvdd-pex";
|
|
pcie->supplies[i++].supply = "vddio-pexctl-aud";
|
|
} else if (of_device_is_compatible(np, "nvidia,tegra210-pcie")) {
|
|
pcie->num_supplies = 3;
|
|
|
|
pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
|
|
sizeof(*pcie->supplies),
|
|
GFP_KERNEL);
|
|
if (!pcie->supplies)
|
|
return -ENOMEM;
|
|
|
|
pcie->supplies[i++].supply = "hvddio-pex";
|
|
pcie->supplies[i++].supply = "dvddio-pex";
|
|
pcie->supplies[i++].supply = "vddio-pex-ctl";
|
|
} else if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
|
|
pcie->num_supplies = 4;
|
|
|
|
pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
|
|
sizeof(*pcie->supplies),
|
|
GFP_KERNEL);
|
|
if (!pcie->supplies)
|
|
return -ENOMEM;
|
|
|
|
pcie->supplies[i++].supply = "avddio-pex";
|
|
pcie->supplies[i++].supply = "dvddio-pex";
|
|
pcie->supplies[i++].supply = "hvdd-pex";
|
|
pcie->supplies[i++].supply = "vddio-pex-ctl";
|
|
} else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
|
|
bool need_pexa = false, need_pexb = false;
|
|
|
|
/* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */
|
|
if (lane_mask & 0x0f)
|
|
need_pexa = true;
|
|
|
|
/* VDD_PEXB and AVDD_PEXB supply lanes 4 to 5 */
|
|
if (lane_mask & 0x30)
|
|
need_pexb = true;
|
|
|
|
pcie->num_supplies = 4 + (need_pexa ? 2 : 0) +
|
|
(need_pexb ? 2 : 0);
|
|
|
|
pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
|
|
sizeof(*pcie->supplies),
|
|
GFP_KERNEL);
|
|
if (!pcie->supplies)
|
|
return -ENOMEM;
|
|
|
|
pcie->supplies[i++].supply = "avdd-pex-pll";
|
|
pcie->supplies[i++].supply = "hvdd-pex";
|
|
pcie->supplies[i++].supply = "vddio-pex-ctl";
|
|
pcie->supplies[i++].supply = "avdd-plle";
|
|
|
|
if (need_pexa) {
|
|
pcie->supplies[i++].supply = "avdd-pexa";
|
|
pcie->supplies[i++].supply = "vdd-pexa";
|
|
}
|
|
|
|
if (need_pexb) {
|
|
pcie->supplies[i++].supply = "avdd-pexb";
|
|
pcie->supplies[i++].supply = "vdd-pexb";
|
|
}
|
|
} else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
|
|
pcie->num_supplies = 5;
|
|
|
|
pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
|
|
sizeof(*pcie->supplies),
|
|
GFP_KERNEL);
|
|
if (!pcie->supplies)
|
|
return -ENOMEM;
|
|
|
|
pcie->supplies[0].supply = "avdd-pex";
|
|
pcie->supplies[1].supply = "vdd-pex";
|
|
pcie->supplies[2].supply = "avdd-pex-pll";
|
|
pcie->supplies[3].supply = "avdd-plle";
|
|
pcie->supplies[4].supply = "vddio-pex-clk";
|
|
}
|
|
|
|
if (of_regulator_bulk_available(dev->of_node, pcie->supplies,
|
|
pcie->num_supplies))
|
|
return devm_regulator_bulk_get(dev, pcie->num_supplies,
|
|
pcie->supplies);
|
|
|
|
/*
|
|
* If not all regulators are available for this new scheme, assume
|
|
* that the device tree complies with an older version of the device
|
|
* tree binding.
|
|
*/
|
|
dev_info(dev, "using legacy DT binding for power supplies\n");
|
|
|
|
devm_kfree(dev, pcie->supplies);
|
|
pcie->num_supplies = 0;
|
|
|
|
return tegra_pcie_get_legacy_regulators(pcie);
|
|
}
|
|
|
|
static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct device_node *np = dev->of_node, *port;
|
|
const struct tegra_pcie_soc *soc = pcie->soc;
|
|
u32 lanes = 0, mask = 0;
|
|
unsigned int lane = 0;
|
|
int err;
|
|
|
|
/* parse root ports */
|
|
for_each_child_of_node(np, port) {
|
|
struct tegra_pcie_port *rp;
|
|
unsigned int index;
|
|
u32 value;
|
|
char *label;
|
|
|
|
err = of_pci_get_devfn(port);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to parse address: %d\n", err);
|
|
goto err_node_put;
|
|
}
|
|
|
|
index = PCI_SLOT(err);
|
|
|
|
if (index < 1 || index > soc->num_ports) {
|
|
dev_err(dev, "invalid port number: %d\n", index);
|
|
err = -EINVAL;
|
|
goto err_node_put;
|
|
}
|
|
|
|
index--;
|
|
|
|
err = of_property_read_u32(port, "nvidia,num-lanes", &value);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to parse # of lanes: %d\n",
|
|
err);
|
|
goto err_node_put;
|
|
}
|
|
|
|
if (value > 16) {
|
|
dev_err(dev, "invalid # of lanes: %u\n", value);
|
|
err = -EINVAL;
|
|
goto err_node_put;
|
|
}
|
|
|
|
lanes |= value << (index << 3);
|
|
|
|
if (!of_device_is_available(port)) {
|
|
lane += value;
|
|
continue;
|
|
}
|
|
|
|
mask |= ((1 << value) - 1) << lane;
|
|
lane += value;
|
|
|
|
rp = devm_kzalloc(dev, sizeof(*rp), GFP_KERNEL);
|
|
if (!rp) {
|
|
err = -ENOMEM;
|
|
goto err_node_put;
|
|
}
|
|
|
|
err = of_address_to_resource(port, 0, &rp->regs);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to parse address: %d\n", err);
|
|
goto err_node_put;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&rp->list);
|
|
rp->index = index;
|
|
rp->lanes = value;
|
|
rp->pcie = pcie;
|
|
rp->np = port;
|
|
|
|
rp->base = devm_pci_remap_cfg_resource(dev, &rp->regs);
|
|
if (IS_ERR(rp->base)) {
|
|
err = PTR_ERR(rp->base);
|
|
goto err_node_put;
|
|
}
|
|
|
|
label = devm_kasprintf(dev, GFP_KERNEL, "pex-reset-%u", index);
|
|
if (!label) {
|
|
err = -ENOMEM;
|
|
goto err_node_put;
|
|
}
|
|
|
|
/*
|
|
* Returns -ENOENT if reset-gpios property is not populated
|
|
* and in this case fall back to using AFI per port register
|
|
* to toggle PERST# SFIO line.
|
|
*/
|
|
rp->reset_gpio = devm_gpiod_get_from_of_node(dev, port,
|
|
"reset-gpios", 0,
|
|
GPIOD_OUT_LOW,
|
|
label);
|
|
if (IS_ERR(rp->reset_gpio)) {
|
|
if (PTR_ERR(rp->reset_gpio) == -ENOENT) {
|
|
rp->reset_gpio = NULL;
|
|
} else {
|
|
dev_err(dev, "failed to get reset GPIO: %ld\n",
|
|
PTR_ERR(rp->reset_gpio));
|
|
err = PTR_ERR(rp->reset_gpio);
|
|
goto err_node_put;
|
|
}
|
|
}
|
|
|
|
list_add_tail(&rp->list, &pcie->ports);
|
|
}
|
|
|
|
err = tegra_pcie_get_xbar_config(pcie, lanes, &pcie->xbar_config);
|
|
if (err < 0) {
|
|
dev_err(dev, "invalid lane configuration\n");
|
|
return err;
|
|
}
|
|
|
|
err = tegra_pcie_get_regulators(pcie, mask);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
|
|
err_node_put:
|
|
of_node_put(port);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* FIXME: If there are no PCIe cards attached, then calling this function
|
|
* can result in the increase of the bootup time as there are big timeout
|
|
* loops.
|
|
*/
|
|
#define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */
|
|
static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port)
|
|
{
|
|
struct device *dev = port->pcie->dev;
|
|
unsigned int retries = 3;
|
|
unsigned long value;
|
|
|
|
/* override presence detection */
|
|
value = readl(port->base + RP_PRIV_MISC);
|
|
value &= ~RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT;
|
|
value |= RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT;
|
|
writel(value, port->base + RP_PRIV_MISC);
|
|
|
|
do {
|
|
unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
|
|
|
|
do {
|
|
value = readl(port->base + RP_VEND_XP);
|
|
|
|
if (value & RP_VEND_XP_DL_UP)
|
|
break;
|
|
|
|
usleep_range(1000, 2000);
|
|
} while (--timeout);
|
|
|
|
if (!timeout) {
|
|
dev_dbg(dev, "link %u down, retrying\n", port->index);
|
|
goto retry;
|
|
}
|
|
|
|
timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
|
|
|
|
do {
|
|
value = readl(port->base + RP_LINK_CONTROL_STATUS);
|
|
|
|
if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
|
|
return true;
|
|
|
|
usleep_range(1000, 2000);
|
|
} while (--timeout);
|
|
|
|
retry:
|
|
tegra_pcie_port_reset(port);
|
|
} while (--retries);
|
|
|
|
return false;
|
|
}
|
|
|
|
static void tegra_pcie_change_link_speed(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct tegra_pcie_port *port;
|
|
ktime_t deadline;
|
|
u32 value;
|
|
|
|
list_for_each_entry(port, &pcie->ports, list) {
|
|
/*
|
|
* "Supported Link Speeds Vector" in "Link Capabilities 2"
|
|
* is not supported by Tegra. tegra_pcie_change_link_speed()
|
|
* is called only for Tegra chips which support Gen2.
|
|
* So there no harm if supported link speed is not verified.
|
|
*/
|
|
value = readl(port->base + RP_LINK_CONTROL_STATUS_2);
|
|
value &= ~PCI_EXP_LNKSTA_CLS;
|
|
value |= PCI_EXP_LNKSTA_CLS_5_0GB;
|
|
writel(value, port->base + RP_LINK_CONTROL_STATUS_2);
|
|
|
|
/*
|
|
* Poll until link comes back from recovery to avoid race
|
|
* condition.
|
|
*/
|
|
deadline = ktime_add_us(ktime_get(), LINK_RETRAIN_TIMEOUT);
|
|
|
|
while (ktime_before(ktime_get(), deadline)) {
|
|
value = readl(port->base + RP_LINK_CONTROL_STATUS);
|
|
if ((value & PCI_EXP_LNKSTA_LT) == 0)
|
|
break;
|
|
|
|
usleep_range(2000, 3000);
|
|
}
|
|
|
|
if (value & PCI_EXP_LNKSTA_LT)
|
|
dev_warn(dev, "PCIe port %u link is in recovery\n",
|
|
port->index);
|
|
|
|
/* Retrain the link */
|
|
value = readl(port->base + RP_LINK_CONTROL_STATUS);
|
|
value |= PCI_EXP_LNKCTL_RL;
|
|
writel(value, port->base + RP_LINK_CONTROL_STATUS);
|
|
|
|
deadline = ktime_add_us(ktime_get(), LINK_RETRAIN_TIMEOUT);
|
|
|
|
while (ktime_before(ktime_get(), deadline)) {
|
|
value = readl(port->base + RP_LINK_CONTROL_STATUS);
|
|
if ((value & PCI_EXP_LNKSTA_LT) == 0)
|
|
break;
|
|
|
|
usleep_range(2000, 3000);
|
|
}
|
|
|
|
if (value & PCI_EXP_LNKSTA_LT)
|
|
dev_err(dev, "failed to retrain link of port %u\n",
|
|
port->index);
|
|
}
|
|
}
|
|
|
|
static void tegra_pcie_enable_ports(struct tegra_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct tegra_pcie_port *port, *tmp;
|
|
|
|
list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
|
|
dev_info(dev, "probing port %u, using %u lanes\n",
|
|
port->index, port->lanes);
|
|
|
|
tegra_pcie_port_enable(port);
|
|
}
|
|
|
|
/* Start LTSSM from Tegra side */
|
|
reset_control_deassert(pcie->pcie_xrst);
|
|
|
|
list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
|
|
if (tegra_pcie_port_check_link(port))
|
|
continue;
|
|
|
|
dev_info(dev, "link %u down, ignoring\n", port->index);
|
|
|
|
tegra_pcie_port_disable(port);
|
|
tegra_pcie_port_free(port);
|
|
}
|
|
|
|
if (pcie->soc->has_gen2)
|
|
tegra_pcie_change_link_speed(pcie);
|
|
}
|
|
|
|
static void tegra_pcie_disable_ports(struct tegra_pcie *pcie)
|
|
{
|
|
struct tegra_pcie_port *port, *tmp;
|
|
|
|
reset_control_assert(pcie->pcie_xrst);
|
|
|
|
list_for_each_entry_safe(port, tmp, &pcie->ports, list)
|
|
tegra_pcie_port_disable(port);
|
|
}
|
|
|
|
static const struct tegra_pcie_port_soc tegra20_pcie_ports[] = {
|
|
{ .pme.turnoff_bit = 0, .pme.ack_bit = 5 },
|
|
{ .pme.turnoff_bit = 8, .pme.ack_bit = 10 },
|
|
};
|
|
|
|
static const struct tegra_pcie_soc tegra20_pcie = {
|
|
.num_ports = 2,
|
|
.ports = tegra20_pcie_ports,
|
|
.msi_base_shift = 0,
|
|
.pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
|
|
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
|
|
.pads_refclk_cfg0 = 0xfa5cfa5c,
|
|
.has_pex_clkreq_en = false,
|
|
.has_pex_bias_ctrl = false,
|
|
.has_intr_prsnt_sense = false,
|
|
.has_cml_clk = false,
|
|
.has_gen2 = false,
|
|
.force_pca_enable = false,
|
|
.program_uphy = true,
|
|
.update_clamp_threshold = false,
|
|
.program_deskew_time = false,
|
|
.update_fc_timer = false,
|
|
.has_cache_bars = true,
|
|
.ectl.enable = false,
|
|
};
|
|
|
|
static const struct tegra_pcie_port_soc tegra30_pcie_ports[] = {
|
|
{ .pme.turnoff_bit = 0, .pme.ack_bit = 5 },
|
|
{ .pme.turnoff_bit = 8, .pme.ack_bit = 10 },
|
|
{ .pme.turnoff_bit = 16, .pme.ack_bit = 18 },
|
|
};
|
|
|
|
static const struct tegra_pcie_soc tegra30_pcie = {
|
|
.num_ports = 3,
|
|
.ports = tegra30_pcie_ports,
|
|
.msi_base_shift = 8,
|
|
.afi_pex2_ctrl = 0x128,
|
|
.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
|
|
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
|
|
.pads_refclk_cfg0 = 0xfa5cfa5c,
|
|
.pads_refclk_cfg1 = 0xfa5cfa5c,
|
|
.has_pex_clkreq_en = true,
|
|
.has_pex_bias_ctrl = true,
|
|
.has_intr_prsnt_sense = true,
|
|
.has_cml_clk = true,
|
|
.has_gen2 = false,
|
|
.force_pca_enable = false,
|
|
.program_uphy = true,
|
|
.update_clamp_threshold = false,
|
|
.program_deskew_time = false,
|
|
.update_fc_timer = false,
|
|
.has_cache_bars = false,
|
|
.ectl.enable = false,
|
|
};
|
|
|
|
static const struct tegra_pcie_soc tegra124_pcie = {
|
|
.num_ports = 2,
|
|
.ports = tegra20_pcie_ports,
|
|
.msi_base_shift = 8,
|
|
.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
|
|
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
|
|
.pads_refclk_cfg0 = 0x44ac44ac,
|
|
.has_pex_clkreq_en = true,
|
|
.has_pex_bias_ctrl = true,
|
|
.has_intr_prsnt_sense = true,
|
|
.has_cml_clk = true,
|
|
.has_gen2 = true,
|
|
.force_pca_enable = false,
|
|
.program_uphy = true,
|
|
.update_clamp_threshold = true,
|
|
.program_deskew_time = false,
|
|
.update_fc_timer = false,
|
|
.has_cache_bars = false,
|
|
.ectl.enable = false,
|
|
};
|
|
|
|
static const struct tegra_pcie_soc tegra210_pcie = {
|
|
.num_ports = 2,
|
|
.ports = tegra20_pcie_ports,
|
|
.msi_base_shift = 8,
|
|
.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
|
|
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
|
|
.pads_refclk_cfg0 = 0x90b890b8,
|
|
/* FC threshold is bit[25:18] */
|
|
.update_fc_threshold = 0x01800000,
|
|
.has_pex_clkreq_en = true,
|
|
.has_pex_bias_ctrl = true,
|
|
.has_intr_prsnt_sense = true,
|
|
.has_cml_clk = true,
|
|
.has_gen2 = true,
|
|
.force_pca_enable = true,
|
|
.program_uphy = true,
|
|
.update_clamp_threshold = true,
|
|
.program_deskew_time = true,
|
|
.update_fc_timer = true,
|
|
.has_cache_bars = false,
|
|
.ectl = {
|
|
.regs = {
|
|
.rp_ectl_2_r1 = 0x0000000f,
|
|
.rp_ectl_4_r1 = 0x00000067,
|
|
.rp_ectl_5_r1 = 0x55010000,
|
|
.rp_ectl_6_r1 = 0x00000001,
|
|
.rp_ectl_2_r2 = 0x0000008f,
|
|
.rp_ectl_4_r2 = 0x000000c7,
|
|
.rp_ectl_5_r2 = 0x55010000,
|
|
.rp_ectl_6_r2 = 0x00000001,
|
|
},
|
|
.enable = true,
|
|
},
|
|
};
|
|
|
|
static const struct tegra_pcie_port_soc tegra186_pcie_ports[] = {
|
|
{ .pme.turnoff_bit = 0, .pme.ack_bit = 5 },
|
|
{ .pme.turnoff_bit = 8, .pme.ack_bit = 10 },
|
|
{ .pme.turnoff_bit = 12, .pme.ack_bit = 14 },
|
|
};
|
|
|
|
static const struct tegra_pcie_soc tegra186_pcie = {
|
|
.num_ports = 3,
|
|
.ports = tegra186_pcie_ports,
|
|
.msi_base_shift = 8,
|
|
.afi_pex2_ctrl = 0x19c,
|
|
.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
|
|
.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
|
|
.pads_refclk_cfg0 = 0x80b880b8,
|
|
.pads_refclk_cfg1 = 0x000480b8,
|
|
.has_pex_clkreq_en = true,
|
|
.has_pex_bias_ctrl = true,
|
|
.has_intr_prsnt_sense = true,
|
|
.has_cml_clk = false,
|
|
.has_gen2 = true,
|
|
.force_pca_enable = false,
|
|
.program_uphy = false,
|
|
.update_clamp_threshold = false,
|
|
.program_deskew_time = false,
|
|
.update_fc_timer = false,
|
|
.has_cache_bars = false,
|
|
.ectl.enable = false,
|
|
};
|
|
|
|
static const struct of_device_id tegra_pcie_of_match[] = {
|
|
{ .compatible = "nvidia,tegra186-pcie", .data = &tegra186_pcie },
|
|
{ .compatible = "nvidia,tegra210-pcie", .data = &tegra210_pcie },
|
|
{ .compatible = "nvidia,tegra124-pcie", .data = &tegra124_pcie },
|
|
{ .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie },
|
|
{ .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tegra_pcie_of_match);
|
|
|
|
static void *tegra_pcie_ports_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
struct tegra_pcie *pcie = s->private;
|
|
|
|
if (list_empty(&pcie->ports))
|
|
return NULL;
|
|
|
|
seq_puts(s, "Index Status\n");
|
|
|
|
return seq_list_start(&pcie->ports, *pos);
|
|
}
|
|
|
|
static void *tegra_pcie_ports_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
struct tegra_pcie *pcie = s->private;
|
|
|
|
return seq_list_next(v, &pcie->ports, pos);
|
|
}
|
|
|
|
static void tegra_pcie_ports_seq_stop(struct seq_file *s, void *v)
|
|
{
|
|
}
|
|
|
|
static int tegra_pcie_ports_seq_show(struct seq_file *s, void *v)
|
|
{
|
|
bool up = false, active = false;
|
|
struct tegra_pcie_port *port;
|
|
unsigned int value;
|
|
|
|
port = list_entry(v, struct tegra_pcie_port, list);
|
|
|
|
value = readl(port->base + RP_VEND_XP);
|
|
|
|
if (value & RP_VEND_XP_DL_UP)
|
|
up = true;
|
|
|
|
value = readl(port->base + RP_LINK_CONTROL_STATUS);
|
|
|
|
if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
|
|
active = true;
|
|
|
|
seq_printf(s, "%2u ", port->index);
|
|
|
|
if (up)
|
|
seq_puts(s, "up");
|
|
|
|
if (active) {
|
|
if (up)
|
|
seq_puts(s, ", ");
|
|
|
|
seq_puts(s, "active");
|
|
}
|
|
|
|
seq_puts(s, "\n");
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations tegra_pcie_ports_sops = {
|
|
.start = tegra_pcie_ports_seq_start,
|
|
.next = tegra_pcie_ports_seq_next,
|
|
.stop = tegra_pcie_ports_seq_stop,
|
|
.show = tegra_pcie_ports_seq_show,
|
|
};
|
|
|
|
DEFINE_SEQ_ATTRIBUTE(tegra_pcie_ports);
|
|
|
|
static void tegra_pcie_debugfs_exit(struct tegra_pcie *pcie)
|
|
{
|
|
debugfs_remove_recursive(pcie->debugfs);
|
|
pcie->debugfs = NULL;
|
|
}
|
|
|
|
static void tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
|
|
{
|
|
pcie->debugfs = debugfs_create_dir("pcie", NULL);
|
|
|
|
debugfs_create_file("ports", S_IFREG | S_IRUGO, pcie->debugfs, pcie,
|
|
&tegra_pcie_ports_fops);
|
|
}
|
|
|
|
static int tegra_pcie_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct pci_host_bridge *host;
|
|
struct tegra_pcie *pcie;
|
|
int err;
|
|
|
|
host = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
|
|
if (!host)
|
|
return -ENOMEM;
|
|
|
|
pcie = pci_host_bridge_priv(host);
|
|
host->sysdata = pcie;
|
|
platform_set_drvdata(pdev, pcie);
|
|
|
|
pcie->soc = of_device_get_match_data(dev);
|
|
INIT_LIST_HEAD(&pcie->ports);
|
|
pcie->dev = dev;
|
|
|
|
err = tegra_pcie_parse_dt(pcie);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = tegra_pcie_get_resources(pcie);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to request resources: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = tegra_pcie_msi_setup(pcie);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to enable MSI support: %d\n", err);
|
|
goto put_resources;
|
|
}
|
|
|
|
pm_runtime_enable(pcie->dev);
|
|
err = pm_runtime_get_sync(pcie->dev);
|
|
if (err < 0) {
|
|
dev_err(dev, "fail to enable pcie controller: %d\n", err);
|
|
goto pm_runtime_put;
|
|
}
|
|
|
|
host->ops = &tegra_pcie_ops;
|
|
host->map_irq = tegra_pcie_map_irq;
|
|
|
|
err = pci_host_probe(host);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to register host: %d\n", err);
|
|
goto pm_runtime_put;
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_DEBUG_FS))
|
|
tegra_pcie_debugfs_init(pcie);
|
|
|
|
return 0;
|
|
|
|
pm_runtime_put:
|
|
pm_runtime_put_sync(pcie->dev);
|
|
pm_runtime_disable(pcie->dev);
|
|
tegra_pcie_msi_teardown(pcie);
|
|
put_resources:
|
|
tegra_pcie_put_resources(pcie);
|
|
return err;
|
|
}
|
|
|
|
static int tegra_pcie_remove(struct platform_device *pdev)
|
|
{
|
|
struct tegra_pcie *pcie = platform_get_drvdata(pdev);
|
|
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
|
|
struct tegra_pcie_port *port, *tmp;
|
|
|
|
if (IS_ENABLED(CONFIG_DEBUG_FS))
|
|
tegra_pcie_debugfs_exit(pcie);
|
|
|
|
pci_stop_root_bus(host->bus);
|
|
pci_remove_root_bus(host->bus);
|
|
pm_runtime_put_sync(pcie->dev);
|
|
pm_runtime_disable(pcie->dev);
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
tegra_pcie_msi_teardown(pcie);
|
|
|
|
tegra_pcie_put_resources(pcie);
|
|
|
|
list_for_each_entry_safe(port, tmp, &pcie->ports, list)
|
|
tegra_pcie_port_free(port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused tegra_pcie_pm_suspend(struct device *dev)
|
|
{
|
|
struct tegra_pcie *pcie = dev_get_drvdata(dev);
|
|
struct tegra_pcie_port *port;
|
|
int err;
|
|
|
|
list_for_each_entry(port, &pcie->ports, list)
|
|
tegra_pcie_pme_turnoff(port);
|
|
|
|
tegra_pcie_disable_ports(pcie);
|
|
|
|
/*
|
|
* AFI_INTR is unmasked in tegra_pcie_enable_controller(), mask it to
|
|
* avoid unwanted interrupts raised by AFI after pex_rst is asserted.
|
|
*/
|
|
tegra_pcie_disable_interrupts(pcie);
|
|
|
|
if (pcie->soc->program_uphy) {
|
|
err = tegra_pcie_phy_power_off(pcie);
|
|
if (err < 0)
|
|
dev_err(dev, "failed to power off PHY(s): %d\n", err);
|
|
}
|
|
|
|
reset_control_assert(pcie->pex_rst);
|
|
clk_disable_unprepare(pcie->pex_clk);
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
tegra_pcie_disable_msi(pcie);
|
|
|
|
pinctrl_pm_select_idle_state(dev);
|
|
tegra_pcie_power_off(pcie);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused tegra_pcie_pm_resume(struct device *dev)
|
|
{
|
|
struct tegra_pcie *pcie = dev_get_drvdata(dev);
|
|
int err;
|
|
|
|
err = tegra_pcie_power_on(pcie);
|
|
if (err) {
|
|
dev_err(dev, "tegra pcie power on fail: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = pinctrl_pm_select_default_state(dev);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to disable PCIe IO DPD: %d\n", err);
|
|
goto poweroff;
|
|
}
|
|
|
|
tegra_pcie_enable_controller(pcie);
|
|
tegra_pcie_setup_translations(pcie);
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
tegra_pcie_enable_msi(pcie);
|
|
|
|
err = clk_prepare_enable(pcie->pex_clk);
|
|
if (err) {
|
|
dev_err(dev, "failed to enable PEX clock: %d\n", err);
|
|
goto pex_dpd_enable;
|
|
}
|
|
|
|
reset_control_deassert(pcie->pex_rst);
|
|
|
|
if (pcie->soc->program_uphy) {
|
|
err = tegra_pcie_phy_power_on(pcie);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to power on PHY(s): %d\n", err);
|
|
goto disable_pex_clk;
|
|
}
|
|
}
|
|
|
|
tegra_pcie_apply_pad_settings(pcie);
|
|
tegra_pcie_enable_ports(pcie);
|
|
|
|
return 0;
|
|
|
|
disable_pex_clk:
|
|
reset_control_assert(pcie->pex_rst);
|
|
clk_disable_unprepare(pcie->pex_clk);
|
|
pex_dpd_enable:
|
|
pinctrl_pm_select_idle_state(dev);
|
|
poweroff:
|
|
tegra_pcie_power_off(pcie);
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct dev_pm_ops tegra_pcie_pm_ops = {
|
|
SET_RUNTIME_PM_OPS(tegra_pcie_pm_suspend, tegra_pcie_pm_resume, NULL)
|
|
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_pcie_pm_suspend,
|
|
tegra_pcie_pm_resume)
|
|
};
|
|
|
|
static struct platform_driver tegra_pcie_driver = {
|
|
.driver = {
|
|
.name = "tegra-pcie",
|
|
.of_match_table = tegra_pcie_of_match,
|
|
.suppress_bind_attrs = true,
|
|
.pm = &tegra_pcie_pm_ops,
|
|
},
|
|
.probe = tegra_pcie_probe,
|
|
.remove = tegra_pcie_remove,
|
|
};
|
|
module_platform_driver(tegra_pcie_driver);
|
|
MODULE_LICENSE("GPL");
|