415 lines
10 KiB
C
415 lines
10 KiB
C
/*
|
|
* Atheros AR71xx PCI host controller driver
|
|
*
|
|
* Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
|
|
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
|
|
*
|
|
* Parts of this file are based on Atheros' 2.6.15 BSP
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/resource.h>
|
|
#include <linux/types.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/pci_regs.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <asm/mach-ar71xx/ar71xx.h>
|
|
#include <asm/mach-ar71xx/pci.h>
|
|
|
|
#undef DEBUG
|
|
#ifdef DEBUG
|
|
#define DBG(fmt, args...) printk(KERN_DEBUG fmt, ## args)
|
|
#else
|
|
#define DBG(fmt, args...)
|
|
#endif
|
|
|
|
#define AR71XX_PCI_DELAY 100 /* msecs */
|
|
|
|
#if 0
|
|
#define PCI_IDSEL_BASE PCI_IDSEL_ADL_START
|
|
#else
|
|
#define PCI_IDSEL_BASE 0
|
|
#endif
|
|
|
|
static void __iomem *ar71xx_pcicfg_base;
|
|
static DEFINE_SPINLOCK(ar71xx_pci_lock);
|
|
static int ar71xx_pci_fixup_enable;
|
|
|
|
static inline void ar71xx_pci_delay(void)
|
|
{
|
|
mdelay(AR71XX_PCI_DELAY);
|
|
}
|
|
|
|
/* Byte lane enable bits */
|
|
static u8 ble_table[4][4] = {
|
|
{0x0, 0xf, 0xf, 0xf},
|
|
{0xe, 0xd, 0xb, 0x7},
|
|
{0xc, 0xf, 0x3, 0xf},
|
|
{0xf, 0xf, 0xf, 0xf},
|
|
};
|
|
|
|
static inline u32 ar71xx_pci_get_ble(int where, int size, int local)
|
|
{
|
|
u32 t;
|
|
|
|
t = ble_table[size & 3][where & 3];
|
|
BUG_ON(t == 0xf);
|
|
t <<= (local) ? 20 : 4;
|
|
return t;
|
|
}
|
|
|
|
static inline u32 ar71xx_pci_bus_addr(struct pci_bus *bus, unsigned int devfn,
|
|
int where)
|
|
{
|
|
u32 ret;
|
|
|
|
if (!bus->number) {
|
|
/* type 0 */
|
|
ret = (1 << (PCI_IDSEL_BASE + PCI_SLOT(devfn)))
|
|
| (PCI_FUNC(devfn) << 8) | (where & ~3);
|
|
} else {
|
|
/* type 1 */
|
|
ret = (bus->number << 16) | (PCI_SLOT(devfn) << 11)
|
|
| (PCI_FUNC(devfn) << 8) | (where & ~3) | 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ar71xx_pci_be_handler(int is_fixup)
|
|
{
|
|
void __iomem *base = ar71xx_pcicfg_base;
|
|
u32 pci_err;
|
|
u32 ahb_err;
|
|
|
|
pci_err = __raw_readl(base + PCI_REG_PCI_ERR) & 3;
|
|
if (pci_err) {
|
|
if (!is_fixup)
|
|
printk(KERN_ALERT "PCI error %d at PCI addr 0x%x\n",
|
|
pci_err,
|
|
__raw_readl(base + PCI_REG_PCI_ERR_ADDR));
|
|
|
|
__raw_writel(pci_err, base + PCI_REG_PCI_ERR);
|
|
}
|
|
|
|
ahb_err = __raw_readl(base + PCI_REG_AHB_ERR) & 1;
|
|
if (ahb_err) {
|
|
if (!is_fixup)
|
|
printk(KERN_ALERT "AHB error at AHB address 0x%x\n",
|
|
__raw_readl(base + PCI_REG_AHB_ERR_ADDR));
|
|
|
|
__raw_writel(ahb_err, base + PCI_REG_AHB_ERR);
|
|
}
|
|
|
|
return (ahb_err | pci_err) ? 1 : 0;
|
|
}
|
|
|
|
static inline int ar71xx_pci_set_cfgaddr(struct pci_bus *bus,
|
|
unsigned int devfn, int where, int size, u32 cmd)
|
|
{
|
|
void __iomem *base = ar71xx_pcicfg_base;
|
|
u32 addr;
|
|
|
|
addr = ar71xx_pci_bus_addr(bus, devfn, where);
|
|
|
|
DBG("PCI: set cfgaddr: %02x:%02x.%01x/%02x:%01d, addr=%08x\n",
|
|
bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
|
|
where, size, addr);
|
|
|
|
__raw_writel(addr, base + PCI_REG_CFG_AD);
|
|
__raw_writel(cmd | ar71xx_pci_get_ble(where, size, 0),
|
|
base + PCI_REG_CFG_CBE);
|
|
|
|
return ar71xx_pci_be_handler(1);
|
|
}
|
|
|
|
static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 *value)
|
|
{
|
|
void __iomem *base = ar71xx_pcicfg_base;
|
|
static u32 mask[8] = {0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0};
|
|
unsigned long flags;
|
|
u32 data;
|
|
int retry = 0;
|
|
int ret;
|
|
|
|
ret = PCIBIOS_SUCCESSFUL;
|
|
|
|
DBG("PCI: read config: %02x:%02x.%01x/%02x:%01d\n", bus->number,
|
|
PCI_SLOT(devfn), PCI_FUNC(devfn), where, size);
|
|
|
|
retry:
|
|
spin_lock_irqsave(&ar71xx_pci_lock, flags);
|
|
|
|
if (bus->number == 0 && devfn == 0) {
|
|
u32 t;
|
|
|
|
t = PCI_CRP_CMD_READ | (where & ~3);
|
|
|
|
__raw_writel(t, base + PCI_REG_CRP_AD_CBE);
|
|
data = __raw_readl(base + PCI_REG_CRP_RDDATA);
|
|
|
|
DBG("PCI: rd local cfg, ad_cbe:%08x, data:%08x\n", t, data);
|
|
|
|
} else {
|
|
int err;
|
|
|
|
err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
|
|
PCI_CFG_CMD_READ);
|
|
|
|
if (err == 0) {
|
|
data = __raw_readl(base + PCI_REG_CFG_RDDATA);
|
|
} else {
|
|
ret = PCIBIOS_DEVICE_NOT_FOUND;
|
|
data = ~0;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
|
|
|
|
DBG("PCI: read config: data=%08x raw=%08x\n",
|
|
(data >> (8 * (where & 3))) & mask[size & 7], data);
|
|
|
|
*value = (data >> (8 * (where & 3))) & mask[size & 7];
|
|
|
|
/*
|
|
* PCI controller bug: sometimes reads to the PCI_COMMAND register
|
|
* return 0xffff, even though the PCI trace shows the correct value.
|
|
* Work around this by retrying reads to this register
|
|
*/
|
|
if (where == PCI_COMMAND && (*value & 0xffff) == 0xffff && retry++ < 2)
|
|
goto retry;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
|
|
int where, int size, u32 value)
|
|
{
|
|
void __iomem *base = ar71xx_pcicfg_base;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
DBG("PCI: write config: %02x:%02x.%01x/%02x:%01d value=%08x\n",
|
|
bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
|
|
where, size, value);
|
|
|
|
value = value << (8 * (where & 3));
|
|
ret = PCIBIOS_SUCCESSFUL;
|
|
|
|
spin_lock_irqsave(&ar71xx_pci_lock, flags);
|
|
if (bus->number == 0 && devfn == 0) {
|
|
u32 t;
|
|
|
|
t = PCI_CRP_CMD_WRITE | (where & ~3);
|
|
t |= ar71xx_pci_get_ble(where, size, 1);
|
|
|
|
DBG("PCI: wr local cfg, ad_cbe:%08x, value:%08x\n", t, value);
|
|
|
|
__raw_writel(t, base + PCI_REG_CRP_AD_CBE);
|
|
__raw_writel(value, base + PCI_REG_CRP_WRDATA);
|
|
} else {
|
|
int err;
|
|
|
|
err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
|
|
PCI_CFG_CMD_WRITE);
|
|
|
|
if (err == 0)
|
|
__raw_writel(value, base + PCI_REG_CFG_WRDATA);
|
|
else
|
|
ret = PCIBIOS_DEVICE_NOT_FOUND;
|
|
}
|
|
spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ar71xx_pci_fixup(struct pci_dev *dev)
|
|
{
|
|
u32 t;
|
|
|
|
if (!ar71xx_pci_fixup_enable)
|
|
return;
|
|
|
|
if (dev->bus->number != 0 || dev->devfn != 0)
|
|
return;
|
|
|
|
DBG("PCI: fixup host controller %s (%04x:%04x)\n", pci_name(dev),
|
|
dev->vendor, dev->device);
|
|
|
|
/* setup COMMAND register */
|
|
t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
|
|
| PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
|
|
|
|
pci_write_config_word(dev, PCI_COMMAND, t);
|
|
}
|
|
DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ar71xx_pci_fixup);
|
|
|
|
int __init ar71xx_pcibios_map_irq(const struct pci_dev *dev, uint8_t slot,
|
|
uint8_t pin)
|
|
{
|
|
int irq = -1;
|
|
int i;
|
|
|
|
slot -= PCI_IDSEL_ADL_START - PCI_IDSEL_BASE;
|
|
|
|
for (i = 0; i < ar71xx_pci_nr_irqs; i++) {
|
|
struct ar71xx_pci_irq *entry;
|
|
|
|
entry = &ar71xx_pci_irq_map[i];
|
|
if (entry->slot == slot && entry->pin == pin) {
|
|
irq = entry->irq;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (irq < 0) {
|
|
printk(KERN_ALERT "PCI: no irq found for pin%u@%s\n",
|
|
pin, pci_name((struct pci_dev *)dev));
|
|
} else {
|
|
printk(KERN_INFO "PCI: mapping irq %d to pin%u@%s\n",
|
|
irq, pin, pci_name((struct pci_dev *)dev));
|
|
}
|
|
|
|
return irq;
|
|
}
|
|
|
|
static struct pci_ops ar71xx_pci_ops = {
|
|
.read = ar71xx_pci_read_config,
|
|
.write = ar71xx_pci_write_config,
|
|
};
|
|
|
|
static struct resource ar71xx_pci_io_resource = {
|
|
.name = "PCI IO space",
|
|
.start = 0,
|
|
.end = 0,
|
|
.flags = IORESOURCE_IO,
|
|
};
|
|
|
|
static struct resource ar71xx_pci_mem_resource = {
|
|
.name = "PCI memory space",
|
|
.start = AR71XX_PCI_MEM_BASE,
|
|
.end = AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE - 1,
|
|
.flags = IORESOURCE_MEM
|
|
};
|
|
|
|
static struct pci_controller ar71xx_pci_controller = {
|
|
.pci_ops = &ar71xx_pci_ops,
|
|
.mem_resource = &ar71xx_pci_mem_resource,
|
|
.io_resource = &ar71xx_pci_io_resource,
|
|
};
|
|
|
|
static void ar71xx_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
void __iomem *base = ar71xx_reset_base;
|
|
u32 pending;
|
|
|
|
pending = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_STATUS) &
|
|
__raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
|
|
|
|
if (pending & PCI_INT_DEV0)
|
|
generic_handle_irq(AR71XX_PCI_IRQ_DEV0);
|
|
|
|
else if (pending & PCI_INT_DEV1)
|
|
generic_handle_irq(AR71XX_PCI_IRQ_DEV1);
|
|
|
|
else if (pending & PCI_INT_DEV2)
|
|
generic_handle_irq(AR71XX_PCI_IRQ_DEV2);
|
|
|
|
else if (pending & PCI_INT_CORE)
|
|
generic_handle_irq(AR71XX_PCI_IRQ_CORE);
|
|
|
|
else
|
|
spurious_interrupt();
|
|
}
|
|
|
|
static void ar71xx_pci_irq_unmask(struct irq_data *d)
|
|
{
|
|
unsigned int irq = d->irq - AR71XX_PCI_IRQ_BASE;
|
|
void __iomem *base = ar71xx_reset_base;
|
|
u32 t;
|
|
|
|
t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
|
|
__raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
|
|
|
|
/* flush write */
|
|
(void) __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
|
|
}
|
|
|
|
static void ar71xx_pci_irq_mask(struct irq_data *d)
|
|
{
|
|
unsigned int irq = d->irq - AR71XX_PCI_IRQ_BASE;
|
|
void __iomem *base = ar71xx_reset_base;
|
|
u32 t;
|
|
|
|
t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
|
|
__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
|
|
|
|
/* flush write */
|
|
(void) __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
|
|
}
|
|
|
|
static struct irq_chip ar71xx_pci_irq_chip = {
|
|
.name = "AR71XX PCI ",
|
|
.irq_mask = ar71xx_pci_irq_mask,
|
|
.irq_unmask = ar71xx_pci_irq_unmask,
|
|
.irq_mask_ack = ar71xx_pci_irq_mask,
|
|
};
|
|
|
|
static void __init ar71xx_pci_irq_init(void)
|
|
{
|
|
void __iomem *base = ar71xx_reset_base;
|
|
int i;
|
|
|
|
__raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_ENABLE);
|
|
__raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_STATUS);
|
|
|
|
for (i = AR71XX_PCI_IRQ_BASE;
|
|
i < AR71XX_PCI_IRQ_BASE + AR71XX_PCI_IRQ_COUNT; i++)
|
|
irq_set_chip_and_handler(i, &ar71xx_pci_irq_chip,
|
|
handle_level_irq);
|
|
|
|
irq_set_chained_handler(AR71XX_CPU_IRQ_IP2, ar71xx_pci_irq_handler);
|
|
}
|
|
|
|
int __init ar71xx_pcibios_init(void)
|
|
{
|
|
void __iomem *ddr_base = ar71xx_ddr_base;
|
|
|
|
ar71xx_device_stop(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
|
|
ar71xx_pci_delay();
|
|
|
|
ar71xx_device_start(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
|
|
ar71xx_pci_delay();
|
|
|
|
ar71xx_pcicfg_base = ioremap_nocache(AR71XX_PCI_CFG_BASE,
|
|
AR71XX_PCI_CFG_SIZE);
|
|
if (ar71xx_pcicfg_base == NULL)
|
|
return -ENOMEM;
|
|
|
|
__raw_writel(PCI_WIN0_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN0);
|
|
__raw_writel(PCI_WIN1_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN1);
|
|
__raw_writel(PCI_WIN2_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN2);
|
|
__raw_writel(PCI_WIN3_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN3);
|
|
__raw_writel(PCI_WIN4_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN4);
|
|
__raw_writel(PCI_WIN5_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN5);
|
|
__raw_writel(PCI_WIN6_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN6);
|
|
__raw_writel(PCI_WIN7_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN7);
|
|
|
|
ar71xx_pci_delay();
|
|
|
|
/* clear bus errors */
|
|
(void)ar71xx_pci_be_handler(1);
|
|
|
|
ar71xx_pci_fixup_enable = 1;
|
|
ar71xx_pci_irq_init();
|
|
register_pci_controller(&ar71xx_pci_controller);
|
|
|
|
return 0;
|
|
}
|