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linux/drivers/pci/controller/pci-v3-semi.c
Tom Rix 58e0cd3e23 PCI: v3-semi: Remove unneeded break 
A break is not needed if it is preceded by a return

Link: https://lore.kernel.org/r/20201019190249.7825-1-trix@redhat.com
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
2020-10-20 10:59:55 -05:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Support for V3 Semiconductor PCI Local Bus to PCI Bridge
* Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
*
* Based on the code from arch/arm/mach-integrator/pci_v3.c
* Copyright (C) 1999 ARM Limited
* Copyright (C) 2000-2001 Deep Blue Solutions Ltd
*
* Contributors to the old driver include:
* Russell King <linux@armlinux.org.uk>
* David A. Rusling <david.rusling@linaro.org> (uHAL, ARM Firmware suite)
* Rob Herring <robh@kernel.org>
* Liviu Dudau <Liviu.Dudau@arm.com>
* Grant Likely <grant.likely@secretlab.ca>
* Arnd Bergmann <arnd@arndb.de>
* Bjorn Helgaas <bhelgaas@google.com>
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/irq.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/clk.h>
#include "../pci.h"
#define V3_PCI_VENDOR 0x00000000
#define V3_PCI_DEVICE 0x00000002
#define V3_PCI_CMD 0x00000004
#define V3_PCI_STAT 0x00000006
#define V3_PCI_CC_REV 0x00000008
#define V3_PCI_HDR_CFG 0x0000000C
#define V3_PCI_IO_BASE 0x00000010
#define V3_PCI_BASE0 0x00000014
#define V3_PCI_BASE1 0x00000018
#define V3_PCI_SUB_VENDOR 0x0000002C
#define V3_PCI_SUB_ID 0x0000002E
#define V3_PCI_ROM 0x00000030
#define V3_PCI_BPARAM 0x0000003C
#define V3_PCI_MAP0 0x00000040
#define V3_PCI_MAP1 0x00000044
#define V3_PCI_INT_STAT 0x00000048
#define V3_PCI_INT_CFG 0x0000004C
#define V3_LB_BASE0 0x00000054
#define V3_LB_BASE1 0x00000058
#define V3_LB_MAP0 0x0000005E
#define V3_LB_MAP1 0x00000062
#define V3_LB_BASE2 0x00000064
#define V3_LB_MAP2 0x00000066
#define V3_LB_SIZE 0x00000068
#define V3_LB_IO_BASE 0x0000006E
#define V3_FIFO_CFG 0x00000070
#define V3_FIFO_PRIORITY 0x00000072
#define V3_FIFO_STAT 0x00000074
#define V3_LB_ISTAT 0x00000076
#define V3_LB_IMASK 0x00000077
#define V3_SYSTEM 0x00000078
#define V3_LB_CFG 0x0000007A
#define V3_PCI_CFG 0x0000007C
#define V3_DMA_PCI_ADR0 0x00000080
#define V3_DMA_PCI_ADR1 0x00000090
#define V3_DMA_LOCAL_ADR0 0x00000084
#define V3_DMA_LOCAL_ADR1 0x00000094
#define V3_DMA_LENGTH0 0x00000088
#define V3_DMA_LENGTH1 0x00000098
#define V3_DMA_CSR0 0x0000008B
#define V3_DMA_CSR1 0x0000009B
#define V3_DMA_CTLB_ADR0 0x0000008C
#define V3_DMA_CTLB_ADR1 0x0000009C
#define V3_DMA_DELAY 0x000000E0
#define V3_MAIL_DATA 0x000000C0
#define V3_PCI_MAIL_IEWR 0x000000D0
#define V3_PCI_MAIL_IERD 0x000000D2
#define V3_LB_MAIL_IEWR 0x000000D4
#define V3_LB_MAIL_IERD 0x000000D6
#define V3_MAIL_WR_STAT 0x000000D8
#define V3_MAIL_RD_STAT 0x000000DA
#define V3_QBA_MAP 0x000000DC
/* PCI STATUS bits */
#define V3_PCI_STAT_PAR_ERR BIT(15)
#define V3_PCI_STAT_SYS_ERR BIT(14)
#define V3_PCI_STAT_M_ABORT_ERR BIT(13)
#define V3_PCI_STAT_T_ABORT_ERR BIT(12)
/* LB ISTAT bits */
#define V3_LB_ISTAT_MAILBOX BIT(7)
#define V3_LB_ISTAT_PCI_RD BIT(6)
#define V3_LB_ISTAT_PCI_WR BIT(5)
#define V3_LB_ISTAT_PCI_INT BIT(4)
#define V3_LB_ISTAT_PCI_PERR BIT(3)
#define V3_LB_ISTAT_I2O_QWR BIT(2)
#define V3_LB_ISTAT_DMA1 BIT(1)
#define V3_LB_ISTAT_DMA0 BIT(0)
/* PCI COMMAND bits */
#define V3_COMMAND_M_FBB_EN BIT(9)
#define V3_COMMAND_M_SERR_EN BIT(8)
#define V3_COMMAND_M_PAR_EN BIT(6)
#define V3_COMMAND_M_MASTER_EN BIT(2)
#define V3_COMMAND_M_MEM_EN BIT(1)
#define V3_COMMAND_M_IO_EN BIT(0)
/* SYSTEM bits */
#define V3_SYSTEM_M_RST_OUT BIT(15)
#define V3_SYSTEM_M_LOCK BIT(14)
#define V3_SYSTEM_UNLOCK 0xa05f
/* PCI CFG bits */
#define V3_PCI_CFG_M_I2O_EN BIT(15)
#define V3_PCI_CFG_M_IO_REG_DIS BIT(14)
#define V3_PCI_CFG_M_IO_DIS BIT(13)
#define V3_PCI_CFG_M_EN3V BIT(12)
#define V3_PCI_CFG_M_RETRY_EN BIT(10)
#define V3_PCI_CFG_M_AD_LOW1 BIT(9)
#define V3_PCI_CFG_M_AD_LOW0 BIT(8)
/*
* This is the value applied to C/BE[3:1], with bit 0 always held 0
* during DMA access.
*/
#define V3_PCI_CFG_M_RTYPE_SHIFT 5
#define V3_PCI_CFG_M_WTYPE_SHIFT 1
#define V3_PCI_CFG_TYPE_DEFAULT 0x3
/* PCI BASE bits (PCI -> Local Bus) */
#define V3_PCI_BASE_M_ADR_BASE 0xFFF00000U
#define V3_PCI_BASE_M_ADR_BASEL 0x000FFF00U
#define V3_PCI_BASE_M_PREFETCH BIT(3)
#define V3_PCI_BASE_M_TYPE (3 << 1)
#define V3_PCI_BASE_M_IO BIT(0)
/* PCI MAP bits (PCI -> Local bus) */
#define V3_PCI_MAP_M_MAP_ADR 0xFFF00000U
#define V3_PCI_MAP_M_RD_POST_INH BIT(15)
#define V3_PCI_MAP_M_ROM_SIZE (3 << 10)
#define V3_PCI_MAP_M_SWAP (3 << 8)
#define V3_PCI_MAP_M_ADR_SIZE 0x000000F0U
#define V3_PCI_MAP_M_REG_EN BIT(1)
#define V3_PCI_MAP_M_ENABLE BIT(0)
/* LB_BASE0,1 bits (Local bus -> PCI) */
#define V3_LB_BASE_ADR_BASE 0xfff00000U
#define V3_LB_BASE_SWAP (3 << 8)
#define V3_LB_BASE_ADR_SIZE (15 << 4)
#define V3_LB_BASE_PREFETCH BIT(3)
#define V3_LB_BASE_ENABLE BIT(0)
#define V3_LB_BASE_ADR_SIZE_1MB (0 << 4)
#define V3_LB_BASE_ADR_SIZE_2MB (1 << 4)
#define V3_LB_BASE_ADR_SIZE_4MB (2 << 4)
#define V3_LB_BASE_ADR_SIZE_8MB (3 << 4)
#define V3_LB_BASE_ADR_SIZE_16MB (4 << 4)
#define V3_LB_BASE_ADR_SIZE_32MB (5 << 4)
#define V3_LB_BASE_ADR_SIZE_64MB (6 << 4)
#define V3_LB_BASE_ADR_SIZE_128MB (7 << 4)
#define V3_LB_BASE_ADR_SIZE_256MB (8 << 4)
#define V3_LB_BASE_ADR_SIZE_512MB (9 << 4)
#define V3_LB_BASE_ADR_SIZE_1GB (10 << 4)
#define V3_LB_BASE_ADR_SIZE_2GB (11 << 4)
#define v3_addr_to_lb_base(a) ((a) & V3_LB_BASE_ADR_BASE)
/* LB_MAP0,1 bits (Local bus -> PCI) */
#define V3_LB_MAP_MAP_ADR 0xfff0U
#define V3_LB_MAP_TYPE (7 << 1)
#define V3_LB_MAP_AD_LOW_EN BIT(0)
#define V3_LB_MAP_TYPE_IACK (0 << 1)
#define V3_LB_MAP_TYPE_IO (1 << 1)
#define V3_LB_MAP_TYPE_MEM (3 << 1)
#define V3_LB_MAP_TYPE_CONFIG (5 << 1)
#define V3_LB_MAP_TYPE_MEM_MULTIPLE (6 << 1)
#define v3_addr_to_lb_map(a) (((a) >> 16) & V3_LB_MAP_MAP_ADR)
/* LB_BASE2 bits (Local bus -> PCI IO) */
#define V3_LB_BASE2_ADR_BASE 0xff00U
#define V3_LB_BASE2_SWAP_AUTO (3 << 6)
#define V3_LB_BASE2_ENABLE BIT(0)
#define v3_addr_to_lb_base2(a) (((a) >> 16) & V3_LB_BASE2_ADR_BASE)
/* LB_MAP2 bits (Local bus -> PCI IO) */
#define V3_LB_MAP2_MAP_ADR 0xff00U
#define v3_addr_to_lb_map2(a) (((a) >> 16) & V3_LB_MAP2_MAP_ADR)
/* FIFO priority bits */
#define V3_FIFO_PRIO_LOCAL BIT(12)
#define V3_FIFO_PRIO_LB_RD1_FLUSH_EOB BIT(10)
#define V3_FIFO_PRIO_LB_RD1_FLUSH_AP1 BIT(11)
#define V3_FIFO_PRIO_LB_RD1_FLUSH_ANY (BIT(10)|BIT(11))
#define V3_FIFO_PRIO_LB_RD0_FLUSH_EOB BIT(8)
#define V3_FIFO_PRIO_LB_RD0_FLUSH_AP1 BIT(9)
#define V3_FIFO_PRIO_LB_RD0_FLUSH_ANY (BIT(8)|BIT(9))
#define V3_FIFO_PRIO_PCI BIT(4)
#define V3_FIFO_PRIO_PCI_RD1_FLUSH_EOB BIT(2)
#define V3_FIFO_PRIO_PCI_RD1_FLUSH_AP1 BIT(3)
#define V3_FIFO_PRIO_PCI_RD1_FLUSH_ANY (BIT(2)|BIT(3))
#define V3_FIFO_PRIO_PCI_RD0_FLUSH_EOB BIT(0)
#define V3_FIFO_PRIO_PCI_RD0_FLUSH_AP1 BIT(1)
#define V3_FIFO_PRIO_PCI_RD0_FLUSH_ANY (BIT(0)|BIT(1))
/* Local bus configuration bits */
#define V3_LB_CFG_LB_TO_64_CYCLES 0x0000
#define V3_LB_CFG_LB_TO_256_CYCLES BIT(13)
#define V3_LB_CFG_LB_TO_512_CYCLES BIT(14)
#define V3_LB_CFG_LB_TO_1024_CYCLES (BIT(13)|BIT(14))
#define V3_LB_CFG_LB_RST BIT(12)
#define V3_LB_CFG_LB_PPC_RDY BIT(11)
#define V3_LB_CFG_LB_LB_INT BIT(10)
#define V3_LB_CFG_LB_ERR_EN BIT(9)
#define V3_LB_CFG_LB_RDY_EN BIT(8)
#define V3_LB_CFG_LB_BE_IMODE BIT(7)
#define V3_LB_CFG_LB_BE_OMODE BIT(6)
#define V3_LB_CFG_LB_ENDIAN BIT(5)
#define V3_LB_CFG_LB_PARK_EN BIT(4)
#define V3_LB_CFG_LB_FBB_DIS BIT(2)
/* ARM Integrator-specific extended control registers */
#define INTEGRATOR_SC_PCI_OFFSET 0x18
#define INTEGRATOR_SC_PCI_ENABLE BIT(0)
#define INTEGRATOR_SC_PCI_INTCLR BIT(1)
#define INTEGRATOR_SC_LBFADDR_OFFSET 0x20
#define INTEGRATOR_SC_LBFCODE_OFFSET 0x24
struct v3_pci {
struct device *dev;
void __iomem *base;
void __iomem *config_base;
u32 config_mem;
u32 non_pre_mem;
u32 pre_mem;
phys_addr_t non_pre_bus_addr;
phys_addr_t pre_bus_addr;
struct regmap *map;
};
/*
* The V3 PCI interface chip in Integrator provides several windows from
* local bus memory into the PCI memory areas. Unfortunately, there
* are not really enough windows for our usage, therefore we reuse
* one of the windows for access to PCI configuration space. On the
* Integrator/AP, the memory map is as follows:
*
* Local Bus Memory Usage
*
* 40000000 - 4FFFFFFF PCI memory. 256M non-prefetchable
* 50000000 - 5FFFFFFF PCI memory. 256M prefetchable
* 60000000 - 60FFFFFF PCI IO. 16M
* 61000000 - 61FFFFFF PCI Configuration. 16M
*
* There are three V3 windows, each described by a pair of V3 registers.
* These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2.
* Base0 and Base1 can be used for any type of PCI memory access. Base2
* can be used either for PCI I/O or for I20 accesses. By default, uHAL
* uses this only for PCI IO space.
*
* Normally these spaces are mapped using the following base registers:
*
* Usage Local Bus Memory Base/Map registers used
*
* Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
* Mem 50000000 - 5FFFFFFF LB_BASE1/LB_MAP1
* IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
* Cfg 61000000 - 61FFFFFF
*
* This means that I20 and PCI configuration space accesses will fail.
* When PCI configuration accesses are needed (via the uHAL PCI
* configuration space primitives) we must remap the spaces as follows:
*
* Usage Local Bus Memory Base/Map registers used
*
* Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
* Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0
* IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
* Cfg 61000000 - 61FFFFFF LB_BASE1/LB_MAP1
*
* To make this work, the code depends on overlapping windows working.
* The V3 chip translates an address by checking its range within
* each of the BASE/MAP pairs in turn (in ascending register number
* order). It will use the first matching pair. So, for example,
* if the same address is mapped by both LB_BASE0/LB_MAP0 and
* LB_BASE1/LB_MAP1, the V3 will use the translation from
* LB_BASE0/LB_MAP0.
*
* To allow PCI Configuration space access, the code enlarges the
* window mapped by LB_BASE0/LB_MAP0 from 256M to 512M. This occludes
* the windows currently mapped by LB_BASE1/LB_MAP1 so that it can
* be remapped for use by configuration cycles.
*
* At the end of the PCI Configuration space accesses,
* LB_BASE1/LB_MAP1 is reset to map PCI Memory. Finally the window
* mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to
* reveal the now restored LB_BASE1/LB_MAP1 window.
*
* NOTE: We do not set up I2O mapping. I suspect that this is only
* for an intelligent (target) device. Using I2O disables most of
* the mappings into PCI memory.
*/
static void __iomem *v3_map_bus(struct pci_bus *bus,
unsigned int devfn, int offset)
{
struct v3_pci *v3 = bus->sysdata;
unsigned int address, mapaddress, busnr;
busnr = bus->number;
if (busnr == 0) {
int slot = PCI_SLOT(devfn);
/*
* local bus segment so need a type 0 config cycle
*
* build the PCI configuration "address" with one-hot in
* A31-A11
*
* mapaddress:
* 3:1 = config cycle (101)
* 0 = PCI A1 & A0 are 0 (0)
*/
address = PCI_FUNC(devfn) << 8;
mapaddress = V3_LB_MAP_TYPE_CONFIG;
if (slot > 12)
/*
* high order bits are handled by the MAP register
*/
mapaddress |= BIT(slot - 5);
else
/*
* low order bits handled directly in the address
*/
address |= BIT(slot + 11);
} else {
/*
* not the local bus segment so need a type 1 config cycle
*
* address:
* 23:16 = bus number
* 15:11 = slot number (7:3 of devfn)
* 10:8 = func number (2:0 of devfn)
*
* mapaddress:
* 3:1 = config cycle (101)
* 0 = PCI A1 & A0 from host bus (1)
*/
mapaddress = V3_LB_MAP_TYPE_CONFIG | V3_LB_MAP_AD_LOW_EN;
address = (busnr << 16) | (devfn << 8);
}
/*
* Set up base0 to see all 512Mbytes of memory space (not
* prefetchable), this frees up base1 for re-use by
* configuration memory
*/
writel(v3_addr_to_lb_base(v3->non_pre_mem) |
V3_LB_BASE_ADR_SIZE_512MB | V3_LB_BASE_ENABLE,
v3->base + V3_LB_BASE0);
/*
* Set up base1/map1 to point into configuration space.
* The config mem is always 16MB.
*/
writel(v3_addr_to_lb_base(v3->config_mem) |
V3_LB_BASE_ADR_SIZE_16MB | V3_LB_BASE_ENABLE,
v3->base + V3_LB_BASE1);
writew(mapaddress, v3->base + V3_LB_MAP1);
return v3->config_base + address + offset;
}
static void v3_unmap_bus(struct v3_pci *v3)
{
/*
* Reassign base1 for use by prefetchable PCI memory
*/
writel(v3_addr_to_lb_base(v3->pre_mem) |
V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
V3_LB_BASE_ENABLE,
v3->base + V3_LB_BASE1);
writew(v3_addr_to_lb_map(v3->pre_bus_addr) |
V3_LB_MAP_TYPE_MEM, /* was V3_LB_MAP_TYPE_MEM_MULTIPLE */
v3->base + V3_LB_MAP1);
/*
* And shrink base0 back to a 256M window (NOTE: MAP0 already correct)
*/
writel(v3_addr_to_lb_base(v3->non_pre_mem) |
V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE,
v3->base + V3_LB_BASE0);
}
static int v3_pci_read_config(struct pci_bus *bus, unsigned int fn,
int config, int size, u32 *value)
{
struct v3_pci *v3 = bus->sysdata;
int ret;
dev_dbg(&bus->dev,
"[read] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
PCI_SLOT(fn), PCI_FUNC(fn), config, size, *value);
ret = pci_generic_config_read(bus, fn, config, size, value);
v3_unmap_bus(v3);
return ret;
}
static int v3_pci_write_config(struct pci_bus *bus, unsigned int fn,
int config, int size, u32 value)
{
struct v3_pci *v3 = bus->sysdata;
int ret;
dev_dbg(&bus->dev,
"[write] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",
PCI_SLOT(fn), PCI_FUNC(fn), config, size, value);
ret = pci_generic_config_write(bus, fn, config, size, value);
v3_unmap_bus(v3);
return ret;
}
static struct pci_ops v3_pci_ops = {
.map_bus = v3_map_bus,
.read = v3_pci_read_config,
.write = v3_pci_write_config,
};
static irqreturn_t v3_irq(int irq, void *data)
{
struct v3_pci *v3 = data;
struct device *dev = v3->dev;
u32 status;
status = readw(v3->base + V3_PCI_STAT);
if (status & V3_PCI_STAT_PAR_ERR)
dev_err(dev, "parity error interrupt\n");
if (status & V3_PCI_STAT_SYS_ERR)
dev_err(dev, "system error interrupt\n");
if (status & V3_PCI_STAT_M_ABORT_ERR)
dev_err(dev, "master abort error interrupt\n");
if (status & V3_PCI_STAT_T_ABORT_ERR)
dev_err(dev, "target abort error interrupt\n");
writew(status, v3->base + V3_PCI_STAT);
status = readb(v3->base + V3_LB_ISTAT);
if (status & V3_LB_ISTAT_MAILBOX)
dev_info(dev, "PCI mailbox interrupt\n");
if (status & V3_LB_ISTAT_PCI_RD)
dev_err(dev, "PCI target LB->PCI READ abort interrupt\n");
if (status & V3_LB_ISTAT_PCI_WR)
dev_err(dev, "PCI target LB->PCI WRITE abort interrupt\n");
if (status & V3_LB_ISTAT_PCI_INT)
dev_info(dev, "PCI pin interrupt\n");
if (status & V3_LB_ISTAT_PCI_PERR)
dev_err(dev, "PCI parity error interrupt\n");
if (status & V3_LB_ISTAT_I2O_QWR)
dev_info(dev, "I2O inbound post queue interrupt\n");
if (status & V3_LB_ISTAT_DMA1)
dev_info(dev, "DMA channel 1 interrupt\n");
if (status & V3_LB_ISTAT_DMA0)
dev_info(dev, "DMA channel 0 interrupt\n");
/* Clear all possible interrupts on the local bus */
writeb(0, v3->base + V3_LB_ISTAT);
if (v3->map)
regmap_write(v3->map, INTEGRATOR_SC_PCI_OFFSET,
INTEGRATOR_SC_PCI_ENABLE |
INTEGRATOR_SC_PCI_INTCLR);
return IRQ_HANDLED;
}
static int v3_integrator_init(struct v3_pci *v3)
{
unsigned int val;
v3->map =
syscon_regmap_lookup_by_compatible("arm,integrator-ap-syscon");
if (IS_ERR(v3->map)) {
dev_err(v3->dev, "no syscon\n");
return -ENODEV;
}
regmap_read(v3->map, INTEGRATOR_SC_PCI_OFFSET, &val);
/* Take the PCI bridge out of reset, clear IRQs */
regmap_write(v3->map, INTEGRATOR_SC_PCI_OFFSET,
INTEGRATOR_SC_PCI_ENABLE |
INTEGRATOR_SC_PCI_INTCLR);
if (!(val & INTEGRATOR_SC_PCI_ENABLE)) {
/* If we were in reset we need to sleep a bit */
msleep(230);
/* Set the physical base for the controller itself */
writel(0x6200, v3->base + V3_LB_IO_BASE);
/* Wait for the mailbox to settle after reset */
do {
writeb(0xaa, v3->base + V3_MAIL_DATA);
writeb(0x55, v3->base + V3_MAIL_DATA + 4);
} while (readb(v3->base + V3_MAIL_DATA) != 0xaa &&
readb(v3->base + V3_MAIL_DATA) != 0x55);
}
dev_info(v3->dev, "initialized PCI V3 Integrator/AP integration\n");
return 0;
}
static int v3_pci_setup_resource(struct v3_pci *v3,
struct pci_host_bridge *host,
struct resource_entry *win)
{
struct device *dev = v3->dev;
struct resource *mem;
struct resource *io;
switch (resource_type(win->res)) {
case IORESOURCE_IO:
io = win->res;
/* Setup window 2 - PCI I/O */
writel(v3_addr_to_lb_base2(pci_pio_to_address(io->start)) |
V3_LB_BASE2_ENABLE,
v3->base + V3_LB_BASE2);
writew(v3_addr_to_lb_map2(io->start - win->offset),
v3->base + V3_LB_MAP2);
break;
case IORESOURCE_MEM:
mem = win->res;
if (mem->flags & IORESOURCE_PREFETCH) {
mem->name = "V3 PCI PRE-MEM";
v3->pre_mem = mem->start;
v3->pre_bus_addr = mem->start - win->offset;
dev_dbg(dev, "PREFETCHABLE MEM window %pR, bus addr %pap\n",
mem, &v3->pre_bus_addr);
if (resource_size(mem) != SZ_256M) {
dev_err(dev, "prefetchable memory range is not 256MB\n");
return -EINVAL;
}
if (v3->non_pre_mem &&
(mem->start != v3->non_pre_mem + SZ_256M)) {
dev_err(dev,
"prefetchable memory is not adjacent to non-prefetchable memory\n");
return -EINVAL;
}
/* Setup window 1 - PCI prefetchable memory */
writel(v3_addr_to_lb_base(v3->pre_mem) |
V3_LB_BASE_ADR_SIZE_256MB |
V3_LB_BASE_PREFETCH |
V3_LB_BASE_ENABLE,
v3->base + V3_LB_BASE1);
writew(v3_addr_to_lb_map(v3->pre_bus_addr) |
V3_LB_MAP_TYPE_MEM, /* Was V3_LB_MAP_TYPE_MEM_MULTIPLE */
v3->base + V3_LB_MAP1);
} else {
mem->name = "V3 PCI NON-PRE-MEM";
v3->non_pre_mem = mem->start;
v3->non_pre_bus_addr = mem->start - win->offset;
dev_dbg(dev, "NON-PREFETCHABLE MEM window %pR, bus addr %pap\n",
mem, &v3->non_pre_bus_addr);
if (resource_size(mem) != SZ_256M) {
dev_err(dev,
"non-prefetchable memory range is not 256MB\n");
return -EINVAL;
}
/* Setup window 0 - PCI non-prefetchable memory */
writel(v3_addr_to_lb_base(v3->non_pre_mem) |
V3_LB_BASE_ADR_SIZE_256MB |
V3_LB_BASE_ENABLE,
v3->base + V3_LB_BASE0);
writew(v3_addr_to_lb_map(v3->non_pre_bus_addr) |
V3_LB_MAP_TYPE_MEM,
v3->base + V3_LB_MAP0);
}
break;
case IORESOURCE_BUS:
break;
default:
dev_info(dev, "Unknown resource type %lu\n",
resource_type(win->res));
break;
}
return 0;
}
static int v3_get_dma_range_config(struct v3_pci *v3,
struct resource_entry *entry,
u32 *pci_base, u32 *pci_map)
{
struct device *dev = v3->dev;
u64 cpu_addr = entry->res->start;
u64 cpu_end = entry->res->end;
u64 pci_end = cpu_end - entry->offset;
u64 pci_addr = entry->res->start - entry->offset;
u32 val;
if (pci_addr & ~V3_PCI_BASE_M_ADR_BASE) {
dev_err(dev, "illegal range, only PCI bits 31..20 allowed\n");
return -EINVAL;
}
val = ((u32)pci_addr) & V3_PCI_BASE_M_ADR_BASE;
*pci_base = val;
if (cpu_addr & ~V3_PCI_MAP_M_MAP_ADR) {
dev_err(dev, "illegal range, only CPU bits 31..20 allowed\n");
return -EINVAL;
}
val = ((u32)cpu_addr) & V3_PCI_MAP_M_MAP_ADR;
switch (resource_size(entry->res)) {
case SZ_1M:
val |= V3_LB_BASE_ADR_SIZE_1MB;
break;
case SZ_2M:
val |= V3_LB_BASE_ADR_SIZE_2MB;
break;
case SZ_4M:
val |= V3_LB_BASE_ADR_SIZE_4MB;
break;
case SZ_8M:
val |= V3_LB_BASE_ADR_SIZE_8MB;
break;
case SZ_16M:
val |= V3_LB_BASE_ADR_SIZE_16MB;
break;
case SZ_32M:
val |= V3_LB_BASE_ADR_SIZE_32MB;
break;
case SZ_64M:
val |= V3_LB_BASE_ADR_SIZE_64MB;
break;
case SZ_128M:
val |= V3_LB_BASE_ADR_SIZE_128MB;
break;
case SZ_256M:
val |= V3_LB_BASE_ADR_SIZE_256MB;
break;
case SZ_512M:
val |= V3_LB_BASE_ADR_SIZE_512MB;
break;
case SZ_1G:
val |= V3_LB_BASE_ADR_SIZE_1GB;
break;
case SZ_2G:
val |= V3_LB_BASE_ADR_SIZE_2GB;
break;
default:
dev_err(v3->dev, "illegal dma memory chunk size\n");
return -EINVAL;
}
val |= V3_PCI_MAP_M_REG_EN | V3_PCI_MAP_M_ENABLE;
*pci_map = val;
dev_dbg(dev,
"DMA MEM CPU: 0x%016llx -> 0x%016llx => "
"PCI: 0x%016llx -> 0x%016llx base %08x map %08x\n",
cpu_addr, cpu_end,
pci_addr, pci_end,
*pci_base, *pci_map);
return 0;
}
static int v3_pci_parse_map_dma_ranges(struct v3_pci *v3,
struct device_node *np)
{
struct pci_host_bridge *bridge = pci_host_bridge_from_priv(v3);
struct device *dev = v3->dev;
struct resource_entry *entry;
int i = 0;
resource_list_for_each_entry(entry, &bridge->dma_ranges) {
int ret;
u32 pci_base, pci_map;
ret = v3_get_dma_range_config(v3, entry, &pci_base, &pci_map);
if (ret)
return ret;
if (i == 0) {
writel(pci_base, v3->base + V3_PCI_BASE0);
writel(pci_map, v3->base + V3_PCI_MAP0);
} else if (i == 1) {
writel(pci_base, v3->base + V3_PCI_BASE1);
writel(pci_map, v3->base + V3_PCI_MAP1);
} else {
dev_err(dev, "too many ranges, only two supported\n");
dev_err(dev, "range %d ignored\n", i);
}
i++;
}
return 0;
}
static int v3_pci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct resource *regs;
struct resource_entry *win;
struct v3_pci *v3;
struct pci_host_bridge *host;
struct clk *clk;
u16 val;
int irq;
int ret;
host = devm_pci_alloc_host_bridge(dev, sizeof(*v3));
if (!host)
return -ENOMEM;
host->ops = &v3_pci_ops;
v3 = pci_host_bridge_priv(host);
host->sysdata = v3;
v3->dev = dev;
/* Get and enable host clock */
clk = devm_clk_get(dev, NULL);
if (IS_ERR(clk)) {
dev_err(dev, "clock not found\n");
return PTR_ERR(clk);
}
ret = clk_prepare_enable(clk);
if (ret) {
dev_err(dev, "unable to enable clock\n");
return ret;
}
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
v3->base = devm_ioremap_resource(dev, regs);
if (IS_ERR(v3->base))
return PTR_ERR(v3->base);
/*
* The hardware has a register with the physical base address
* of the V3 controller itself, verify that this is the same
* as the physical memory we've remapped it from.
*/
if (readl(v3->base + V3_LB_IO_BASE) != (regs->start >> 16))
dev_err(dev, "V3_LB_IO_BASE = %08x but device is @%pR\n",
readl(v3->base + V3_LB_IO_BASE), regs);
/* Configuration space is 16MB directly mapped */
regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (resource_size(regs) != SZ_16M) {
dev_err(dev, "config mem is not 16MB!\n");
return -EINVAL;
}
v3->config_mem = regs->start;
v3->config_base = devm_ioremap_resource(dev, regs);
if (IS_ERR(v3->config_base))
return PTR_ERR(v3->config_base);
/* Get and request error IRQ resource */
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
ret = devm_request_irq(dev, irq, v3_irq, 0,
"PCIv3 error", v3);
if (ret < 0) {
dev_err(dev,
"unable to request PCIv3 error IRQ %d (%d)\n",
irq, ret);
return ret;
}
/*
* Unlock V3 registers, but only if they were previously locked.
*/
if (readw(v3->base + V3_SYSTEM) & V3_SYSTEM_M_LOCK)
writew(V3_SYSTEM_UNLOCK, v3->base + V3_SYSTEM);
/* Disable all slave access while we set up the windows */
val = readw(v3->base + V3_PCI_CMD);
val &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
writew(val, v3->base + V3_PCI_CMD);
/* Put the PCI bus into reset */
val = readw(v3->base + V3_SYSTEM);
val &= ~V3_SYSTEM_M_RST_OUT;
writew(val, v3->base + V3_SYSTEM);
/* Retry until we're ready */
val = readw(v3->base + V3_PCI_CFG);
val |= V3_PCI_CFG_M_RETRY_EN;
writew(val, v3->base + V3_PCI_CFG);
/* Set up the local bus protocol */
val = readw(v3->base + V3_LB_CFG);
val |= V3_LB_CFG_LB_BE_IMODE; /* Byte enable input */
val |= V3_LB_CFG_LB_BE_OMODE; /* Byte enable output */
val &= ~V3_LB_CFG_LB_ENDIAN; /* Little endian */
val &= ~V3_LB_CFG_LB_PPC_RDY; /* TODO: when using on PPC403Gx, set to 1 */
writew(val, v3->base + V3_LB_CFG);
/* Enable the PCI bus master */
val = readw(v3->base + V3_PCI_CMD);
val |= PCI_COMMAND_MASTER;
writew(val, v3->base + V3_PCI_CMD);
/* Get the I/O and memory ranges from DT */
resource_list_for_each_entry(win, &host->windows) {
ret = v3_pci_setup_resource(v3, host, win);
if (ret) {
dev_err(dev, "error setting up resources\n");
return ret;
}
}
ret = v3_pci_parse_map_dma_ranges(v3, np);
if (ret)
return ret;
/*
* Disable PCI to host IO cycles, enable I/O buffers @3.3V,
* set AD_LOW0 to 1 if one of the LB_MAP registers choose
* to use this (should be unused).
*/
writel(0x00000000, v3->base + V3_PCI_IO_BASE);
val = V3_PCI_CFG_M_IO_REG_DIS | V3_PCI_CFG_M_IO_DIS |
V3_PCI_CFG_M_EN3V | V3_PCI_CFG_M_AD_LOW0;
/*
* DMA read and write from PCI bus commands types
*/
val |= V3_PCI_CFG_TYPE_DEFAULT << V3_PCI_CFG_M_RTYPE_SHIFT;
val |= V3_PCI_CFG_TYPE_DEFAULT << V3_PCI_CFG_M_WTYPE_SHIFT;
writew(val, v3->base + V3_PCI_CFG);
/*
* Set the V3 FIFO such that writes have higher priority than
* reads, and local bus write causes local bus read fifo flush
* on aperture 1. Same for PCI.
*/
writew(V3_FIFO_PRIO_LB_RD1_FLUSH_AP1 |
V3_FIFO_PRIO_LB_RD0_FLUSH_AP1 |
V3_FIFO_PRIO_PCI_RD1_FLUSH_AP1 |
V3_FIFO_PRIO_PCI_RD0_FLUSH_AP1,
v3->base + V3_FIFO_PRIORITY);
/*
* Clear any error interrupts, and enable parity and write error
* interrupts
*/
writeb(0, v3->base + V3_LB_ISTAT);
val = readw(v3->base + V3_LB_CFG);
val |= V3_LB_CFG_LB_LB_INT;
writew(val, v3->base + V3_LB_CFG);
writeb(V3_LB_ISTAT_PCI_WR | V3_LB_ISTAT_PCI_PERR,
v3->base + V3_LB_IMASK);
/* Special Integrator initialization */
if (of_device_is_compatible(np, "arm,integrator-ap-pci")) {
ret = v3_integrator_init(v3);
if (ret)
return ret;
}
/* Post-init: enable PCI memory and invalidate (master already on) */
val = readw(v3->base + V3_PCI_CMD);
val |= PCI_COMMAND_MEMORY | PCI_COMMAND_INVALIDATE;
writew(val, v3->base + V3_PCI_CMD);
/* Clear pending interrupts */
writeb(0, v3->base + V3_LB_ISTAT);
/* Read or write errors and parity errors cause interrupts */
writeb(V3_LB_ISTAT_PCI_RD | V3_LB_ISTAT_PCI_WR | V3_LB_ISTAT_PCI_PERR,
v3->base + V3_LB_IMASK);
/* Take the PCI bus out of reset so devices can initialize */
val = readw(v3->base + V3_SYSTEM);
val |= V3_SYSTEM_M_RST_OUT;
writew(val, v3->base + V3_SYSTEM);
/*
* Re-lock the system register.
*/
val = readw(v3->base + V3_SYSTEM);
val |= V3_SYSTEM_M_LOCK;
writew(val, v3->base + V3_SYSTEM);
return pci_host_probe(host);
}
static const struct of_device_id v3_pci_of_match[] = {
{
.compatible = "v3,v360epc-pci",
},
{},
};
static struct platform_driver v3_pci_driver = {
.driver = {
.name = "pci-v3-semi",
.of_match_table = of_match_ptr(v3_pci_of_match),
.suppress_bind_attrs = true,
},
.probe = v3_pci_probe,
};
builtin_platform_driver(v3_pci_driver);
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