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linux-next/drivers/amba/tegra-ahb.c
Gustavo A. R. Silva 06f3a5a4cb ARM: tegra: Replace zero-length array with flexible-array 
There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code should
always use “flexible array members”[1] for these cases. The older style of
one-element or zero-length arrays should no longer be used[2].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/21

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-06-15 23:08:28 -05:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
* Copyright (C) 2011 Google, Inc.
*
* Author:
* Jay Cheng <jacheng@nvidia.com>
* James Wylder <james.wylder@motorola.com>
* Benoit Goby <benoit@android.com>
* Colin Cross <ccross@android.com>
* Hiroshi DOYU <hdoyu@nvidia.com>
*/
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/of.h>
#include <soc/tegra/ahb.h>
#define DRV_NAME "tegra-ahb"
#define AHB_ARBITRATION_DISABLE 0x04
#define AHB_ARBITRATION_PRIORITY_CTRL 0x08
#define AHB_PRIORITY_WEIGHT(x) (((x) & 0x7) << 29)
#define PRIORITY_SELECT_USB BIT(6)
#define PRIORITY_SELECT_USB2 BIT(18)
#define PRIORITY_SELECT_USB3 BIT(17)
#define AHB_GIZMO_AHB_MEM 0x10
#define ENB_FAST_REARBITRATE BIT(2)
#define DONT_SPLIT_AHB_WR BIT(7)
#define AHB_GIZMO_APB_DMA 0x14
#define AHB_GIZMO_IDE 0x1c
#define AHB_GIZMO_USB 0x20
#define AHB_GIZMO_AHB_XBAR_BRIDGE 0x24
#define AHB_GIZMO_CPU_AHB_BRIDGE 0x28
#define AHB_GIZMO_COP_AHB_BRIDGE 0x2c
#define AHB_GIZMO_XBAR_APB_CTLR 0x30
#define AHB_GIZMO_VCP_AHB_BRIDGE 0x34
#define AHB_GIZMO_NAND 0x40
#define AHB_GIZMO_SDMMC4 0x48
#define AHB_GIZMO_XIO 0x4c
#define AHB_GIZMO_BSEV 0x64
#define AHB_GIZMO_BSEA 0x74
#define AHB_GIZMO_NOR 0x78
#define AHB_GIZMO_USB2 0x7c
#define AHB_GIZMO_USB3 0x80
#define IMMEDIATE BIT(18)
#define AHB_GIZMO_SDMMC1 0x84
#define AHB_GIZMO_SDMMC2 0x88
#define AHB_GIZMO_SDMMC3 0x8c
#define AHB_MEM_PREFETCH_CFG_X 0xdc
#define AHB_ARBITRATION_XBAR_CTRL 0xe0
#define AHB_MEM_PREFETCH_CFG3 0xe4
#define AHB_MEM_PREFETCH_CFG4 0xe8
#define AHB_MEM_PREFETCH_CFG1 0xf0
#define AHB_MEM_PREFETCH_CFG2 0xf4
#define PREFETCH_ENB BIT(31)
#define MST_ID(x) (((x) & 0x1f) << 26)
#define AHBDMA_MST_ID MST_ID(5)
#define USB_MST_ID MST_ID(6)
#define USB2_MST_ID MST_ID(18)
#define USB3_MST_ID MST_ID(17)
#define ADDR_BNDRY(x) (((x) & 0xf) << 21)
#define INACTIVITY_TIMEOUT(x) (((x) & 0xffff) << 0)
#define AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID 0xfc
#define AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE BIT(17)
/*
* INCORRECT_BASE_ADDR_LOW_BYTE: Legacy kernel DT files for Tegra SoCs
* prior to Tegra124 generally use a physical base address ending in
* 0x4 for the AHB IP block. According to the TRM, the low byte
* should be 0x0. During device probing, this macro is used to detect
* whether the passed-in physical address is incorrect, and if so, to
* correct it.
*/
#define INCORRECT_BASE_ADDR_LOW_BYTE 0x4
static struct platform_driver tegra_ahb_driver;
static const u32 tegra_ahb_gizmo[] = {
AHB_ARBITRATION_DISABLE,
AHB_ARBITRATION_PRIORITY_CTRL,
AHB_GIZMO_AHB_MEM,
AHB_GIZMO_APB_DMA,
AHB_GIZMO_IDE,
AHB_GIZMO_USB,
AHB_GIZMO_AHB_XBAR_BRIDGE,
AHB_GIZMO_CPU_AHB_BRIDGE,
AHB_GIZMO_COP_AHB_BRIDGE,
AHB_GIZMO_XBAR_APB_CTLR,
AHB_GIZMO_VCP_AHB_BRIDGE,
AHB_GIZMO_NAND,
AHB_GIZMO_SDMMC4,
AHB_GIZMO_XIO,
AHB_GIZMO_BSEV,
AHB_GIZMO_BSEA,
AHB_GIZMO_NOR,
AHB_GIZMO_USB2,
AHB_GIZMO_USB3,
AHB_GIZMO_SDMMC1,
AHB_GIZMO_SDMMC2,
AHB_GIZMO_SDMMC3,
AHB_MEM_PREFETCH_CFG_X,
AHB_ARBITRATION_XBAR_CTRL,
AHB_MEM_PREFETCH_CFG3,
AHB_MEM_PREFETCH_CFG4,
AHB_MEM_PREFETCH_CFG1,
AHB_MEM_PREFETCH_CFG2,
AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID,
};
struct tegra_ahb {
void __iomem *regs;
struct device *dev;
u32 ctx[];
};
static inline u32 gizmo_readl(struct tegra_ahb *ahb, u32 offset)
{
return readl(ahb->regs + offset);
}
static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
{
writel(value, ahb->regs + offset);
}
#ifdef CONFIG_TEGRA_IOMMU_SMMU
int tegra_ahb_enable_smmu(struct device_node *dn)
{
struct device *dev;
u32 val;
struct tegra_ahb *ahb;
dev = driver_find_device_by_of_node(&tegra_ahb_driver.driver, dn);
if (!dev)
return -EPROBE_DEFER;
ahb = dev_get_drvdata(dev);
val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
return 0;
}
EXPORT_SYMBOL(tegra_ahb_enable_smmu);
#endif
static int __maybe_unused tegra_ahb_suspend(struct device *dev)
{
int i;
struct tegra_ahb *ahb = dev_get_drvdata(dev);
for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
ahb->ctx[i] = gizmo_readl(ahb, tegra_ahb_gizmo[i]);
return 0;
}
static int __maybe_unused tegra_ahb_resume(struct device *dev)
{
int i;
struct tegra_ahb *ahb = dev_get_drvdata(dev);
for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
gizmo_writel(ahb, ahb->ctx[i], tegra_ahb_gizmo[i]);
return 0;
}
static UNIVERSAL_DEV_PM_OPS(tegra_ahb_pm,
tegra_ahb_suspend,
tegra_ahb_resume, NULL);
static void tegra_ahb_gizmo_init(struct tegra_ahb *ahb)
{
u32 val;
val = gizmo_readl(ahb, AHB_GIZMO_AHB_MEM);
val |= ENB_FAST_REARBITRATE | IMMEDIATE | DONT_SPLIT_AHB_WR;
gizmo_writel(ahb, val, AHB_GIZMO_AHB_MEM);
val = gizmo_readl(ahb, AHB_GIZMO_USB);
val |= IMMEDIATE;
gizmo_writel(ahb, val, AHB_GIZMO_USB);
val = gizmo_readl(ahb, AHB_GIZMO_USB2);
val |= IMMEDIATE;
gizmo_writel(ahb, val, AHB_GIZMO_USB2);
val = gizmo_readl(ahb, AHB_GIZMO_USB3);
val |= IMMEDIATE;
gizmo_writel(ahb, val, AHB_GIZMO_USB3);
val = gizmo_readl(ahb, AHB_ARBITRATION_PRIORITY_CTRL);
val |= PRIORITY_SELECT_USB |
PRIORITY_SELECT_USB2 |
PRIORITY_SELECT_USB3 |
AHB_PRIORITY_WEIGHT(7);
gizmo_writel(ahb, val, AHB_ARBITRATION_PRIORITY_CTRL);
val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG1);
val &= ~MST_ID(~0);
val |= PREFETCH_ENB |
AHBDMA_MST_ID |
ADDR_BNDRY(0xc) |
INACTIVITY_TIMEOUT(0x1000);
gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG1);
val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG2);
val &= ~MST_ID(~0);
val |= PREFETCH_ENB |
USB_MST_ID |
ADDR_BNDRY(0xc) |
INACTIVITY_TIMEOUT(0x1000);
gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG2);
val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG3);
val &= ~MST_ID(~0);
val |= PREFETCH_ENB |
USB3_MST_ID |
ADDR_BNDRY(0xc) |
INACTIVITY_TIMEOUT(0x1000);
gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG3);
val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG4);
val &= ~MST_ID(~0);
val |= PREFETCH_ENB |
USB2_MST_ID |
ADDR_BNDRY(0xc) |
INACTIVITY_TIMEOUT(0x1000);
gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG4);
}
static int tegra_ahb_probe(struct platform_device *pdev)
{
struct resource *res;
struct tegra_ahb *ahb;
size_t bytes;
bytes = sizeof(*ahb) + sizeof(u32) * ARRAY_SIZE(tegra_ahb_gizmo);
ahb = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL);
if (!ahb)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
/* Correct the IP block base address if necessary */
if (res &&
(res->start & INCORRECT_BASE_ADDR_LOW_BYTE) ==
INCORRECT_BASE_ADDR_LOW_BYTE) {
dev_warn(&pdev->dev, "incorrect AHB base address in DT data - enabling workaround\n");
res->start -= INCORRECT_BASE_ADDR_LOW_BYTE;
}
ahb->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(ahb->regs))
return PTR_ERR(ahb->regs);
ahb->dev = &pdev->dev;
platform_set_drvdata(pdev, ahb);
tegra_ahb_gizmo_init(ahb);
return 0;
}
static const struct of_device_id tegra_ahb_of_match[] = {
{ .compatible = "nvidia,tegra30-ahb", },
{ .compatible = "nvidia,tegra20-ahb", },
{},
};
static struct platform_driver tegra_ahb_driver = {
.probe = tegra_ahb_probe,
.driver = {
.name = DRV_NAME,
.of_match_table = tegra_ahb_of_match,
.pm = &tegra_ahb_pm,
},
};
module_platform_driver(tegra_ahb_driver);
MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
MODULE_DESCRIPTION("Tegra AHB driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRV_NAME);
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