499 строки
12 KiB
C
499 строки
12 KiB
C
/*
|
|
* arch/arm/mach-ixp4xx/common-pci.c
|
|
*
|
|
* IXP4XX PCI routines for all platforms
|
|
*
|
|
* Maintainer: Deepak Saxena <dsaxena@plexity.net>
|
|
*
|
|
* Copyright (C) 2002 Intel Corporation.
|
|
* Copyright (C) 2003 Greg Ungerer <gerg@snapgear.com>
|
|
* Copyright (C) 2003-2004 MontaVista Software, Inc.
|
|
*
|
|
* 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/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/init.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
#include <linux/io.h>
|
|
#include <asm/dma-mapping.h>
|
|
|
|
#include <asm/cputype.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/sizes.h>
|
|
#include <asm/system.h>
|
|
#include <asm/mach/pci.h>
|
|
#include <mach/hardware.h>
|
|
|
|
|
|
/*
|
|
* IXP4xx PCI read function is dependent on whether we are
|
|
* running A0 or B0 (AppleGate) silicon.
|
|
*/
|
|
int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
|
|
|
|
/*
|
|
* Base address for PCI regsiter region
|
|
*/
|
|
unsigned long ixp4xx_pci_reg_base = 0;
|
|
|
|
/*
|
|
* PCI cfg an I/O routines are done by programming a
|
|
* command/byte enable register, and then read/writing
|
|
* the data from a data regsiter. We need to ensure
|
|
* these transactions are atomic or we will end up
|
|
* with corrupt data on the bus or in a driver.
|
|
*/
|
|
static DEFINE_SPINLOCK(ixp4xx_pci_lock);
|
|
|
|
/*
|
|
* Read from PCI config space
|
|
*/
|
|
static void crp_read(u32 ad_cbe, u32 *data)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&ixp4xx_pci_lock, flags);
|
|
*PCI_CRP_AD_CBE = ad_cbe;
|
|
*data = *PCI_CRP_RDATA;
|
|
spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Write to PCI config space
|
|
*/
|
|
static void crp_write(u32 ad_cbe, u32 data)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&ixp4xx_pci_lock, flags);
|
|
*PCI_CRP_AD_CBE = CRP_AD_CBE_WRITE | ad_cbe;
|
|
*PCI_CRP_WDATA = data;
|
|
spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
|
|
}
|
|
|
|
static inline int check_master_abort(void)
|
|
{
|
|
/* check Master Abort bit after access */
|
|
unsigned long isr = *PCI_ISR;
|
|
|
|
if (isr & PCI_ISR_PFE) {
|
|
/* make sure the Master Abort bit is reset */
|
|
*PCI_ISR = PCI_ISR_PFE;
|
|
pr_debug("%s failed\n", __func__);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ixp4xx_pci_read_errata(u32 addr, u32 cmd, u32* data)
|
|
{
|
|
unsigned long flags;
|
|
int retval = 0;
|
|
int i;
|
|
|
|
spin_lock_irqsave(&ixp4xx_pci_lock, flags);
|
|
|
|
*PCI_NP_AD = addr;
|
|
|
|
/*
|
|
* PCI workaround - only works if NP PCI space reads have
|
|
* no side effects!!! Read 8 times. last one will be good.
|
|
*/
|
|
for (i = 0; i < 8; i++) {
|
|
*PCI_NP_CBE = cmd;
|
|
*data = *PCI_NP_RDATA;
|
|
*data = *PCI_NP_RDATA;
|
|
}
|
|
|
|
if(check_master_abort())
|
|
retval = 1;
|
|
|
|
spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
int ixp4xx_pci_read_no_errata(u32 addr, u32 cmd, u32* data)
|
|
{
|
|
unsigned long flags;
|
|
int retval = 0;
|
|
|
|
spin_lock_irqsave(&ixp4xx_pci_lock, flags);
|
|
|
|
*PCI_NP_AD = addr;
|
|
|
|
/* set up and execute the read */
|
|
*PCI_NP_CBE = cmd;
|
|
|
|
/* the result of the read is now in NP_RDATA */
|
|
*data = *PCI_NP_RDATA;
|
|
|
|
if(check_master_abort())
|
|
retval = 1;
|
|
|
|
spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data)
|
|
{
|
|
unsigned long flags;
|
|
int retval = 0;
|
|
|
|
spin_lock_irqsave(&ixp4xx_pci_lock, flags);
|
|
|
|
*PCI_NP_AD = addr;
|
|
|
|
/* set up the write */
|
|
*PCI_NP_CBE = cmd;
|
|
|
|
/* execute the write by writing to NP_WDATA */
|
|
*PCI_NP_WDATA = data;
|
|
|
|
if(check_master_abort())
|
|
retval = 1;
|
|
|
|
spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
static u32 ixp4xx_config_addr(u8 bus_num, u16 devfn, int where)
|
|
{
|
|
u32 addr;
|
|
if (!bus_num) {
|
|
/* type 0 */
|
|
addr = BIT(32-PCI_SLOT(devfn)) | ((PCI_FUNC(devfn)) << 8) |
|
|
(where & ~3);
|
|
} else {
|
|
/* type 1 */
|
|
addr = (bus_num << 16) | ((PCI_SLOT(devfn)) << 11) |
|
|
((PCI_FUNC(devfn)) << 8) | (where & ~3) | 1;
|
|
}
|
|
return addr;
|
|
}
|
|
|
|
/*
|
|
* Mask table, bits to mask for quantity of size 1, 2 or 4 bytes.
|
|
* 0 and 3 are not valid indexes...
|
|
*/
|
|
static u32 bytemask[] = {
|
|
/*0*/ 0,
|
|
/*1*/ 0xff,
|
|
/*2*/ 0xffff,
|
|
/*3*/ 0,
|
|
/*4*/ 0xffffffff,
|
|
};
|
|
|
|
static u32 local_byte_lane_enable_bits(u32 n, int size)
|
|
{
|
|
if (size == 1)
|
|
return (0xf & ~BIT(n)) << CRP_AD_CBE_BESL;
|
|
if (size == 2)
|
|
return (0xf & ~(BIT(n) | BIT(n+1))) << CRP_AD_CBE_BESL;
|
|
if (size == 4)
|
|
return 0;
|
|
return 0xffffffff;
|
|
}
|
|
|
|
static int local_read_config(int where, int size, u32 *value)
|
|
{
|
|
u32 n, data;
|
|
pr_debug("local_read_config from %d size %d\n", where, size);
|
|
n = where % 4;
|
|
crp_read(where & ~3, &data);
|
|
*value = (data >> (8*n)) & bytemask[size];
|
|
pr_debug("local_read_config read %#x\n", *value);
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
static int local_write_config(int where, int size, u32 value)
|
|
{
|
|
u32 n, byte_enables, data;
|
|
pr_debug("local_write_config %#x to %d size %d\n", value, where, size);
|
|
n = where % 4;
|
|
byte_enables = local_byte_lane_enable_bits(n, size);
|
|
if (byte_enables == 0xffffffff)
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
data = value << (8*n);
|
|
crp_write((where & ~3) | byte_enables, data);
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
static u32 byte_lane_enable_bits(u32 n, int size)
|
|
{
|
|
if (size == 1)
|
|
return (0xf & ~BIT(n)) << 4;
|
|
if (size == 2)
|
|
return (0xf & ~(BIT(n) | BIT(n+1))) << 4;
|
|
if (size == 4)
|
|
return 0;
|
|
return 0xffffffff;
|
|
}
|
|
|
|
static int ixp4xx_pci_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
|
|
{
|
|
u32 n, byte_enables, addr, data;
|
|
u8 bus_num = bus->number;
|
|
|
|
pr_debug("read_config from %d size %d dev %d:%d:%d\n", where, size,
|
|
bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn));
|
|
|
|
*value = 0xffffffff;
|
|
n = where % 4;
|
|
byte_enables = byte_lane_enable_bits(n, size);
|
|
if (byte_enables == 0xffffffff)
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
|
|
addr = ixp4xx_config_addr(bus_num, devfn, where);
|
|
if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_CONFIGREAD, &data))
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
|
|
*value = (data >> (8*n)) & bytemask[size];
|
|
pr_debug("read_config_byte read %#x\n", *value);
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
static int ixp4xx_pci_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
|
|
{
|
|
u32 n, byte_enables, addr, data;
|
|
u8 bus_num = bus->number;
|
|
|
|
pr_debug("write_config_byte %#x to %d size %d dev %d:%d:%d\n", value, where,
|
|
size, bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn));
|
|
|
|
n = where % 4;
|
|
byte_enables = byte_lane_enable_bits(n, size);
|
|
if (byte_enables == 0xffffffff)
|
|
return PCIBIOS_BAD_REGISTER_NUMBER;
|
|
|
|
addr = ixp4xx_config_addr(bus_num, devfn, where);
|
|
data = value << (8*n);
|
|
if (ixp4xx_pci_write(addr, byte_enables | NP_CMD_CONFIGWRITE, data))
|
|
return PCIBIOS_DEVICE_NOT_FOUND;
|
|
|
|
return PCIBIOS_SUCCESSFUL;
|
|
}
|
|
|
|
struct pci_ops ixp4xx_ops = {
|
|
.read = ixp4xx_pci_read_config,
|
|
.write = ixp4xx_pci_write_config,
|
|
};
|
|
|
|
/*
|
|
* PCI abort handler
|
|
*/
|
|
static int abort_handler(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
|
|
{
|
|
u32 isr, status;
|
|
|
|
isr = *PCI_ISR;
|
|
local_read_config(PCI_STATUS, 2, &status);
|
|
pr_debug("PCI: abort_handler addr = %#lx, isr = %#x, "
|
|
"status = %#x\n", addr, isr, status);
|
|
|
|
/* make sure the Master Abort bit is reset */
|
|
*PCI_ISR = PCI_ISR_PFE;
|
|
status |= PCI_STATUS_REC_MASTER_ABORT;
|
|
local_write_config(PCI_STATUS, 2, status);
|
|
|
|
/*
|
|
* If it was an imprecise abort, then we need to correct the
|
|
* return address to be _after_ the instruction.
|
|
*/
|
|
if (fsr & (1 << 10))
|
|
regs->ARM_pc += 4;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int ixp4xx_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
|
|
{
|
|
return (dma_addr + size) >= SZ_64M;
|
|
}
|
|
|
|
/*
|
|
* Setup DMA mask to 64MB on PCI devices. Ignore all other devices.
|
|
*/
|
|
static int ixp4xx_pci_platform_notify(struct device *dev)
|
|
{
|
|
if(dev->bus == &pci_bus_type) {
|
|
*dev->dma_mask = SZ_64M - 1;
|
|
dev->coherent_dma_mask = SZ_64M - 1;
|
|
dmabounce_register_dev(dev, 2048, 4096, ixp4xx_needs_bounce);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ixp4xx_pci_platform_notify_remove(struct device *dev)
|
|
{
|
|
if(dev->bus == &pci_bus_type) {
|
|
dmabounce_unregister_dev(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void __init ixp4xx_pci_preinit(void)
|
|
{
|
|
unsigned long cpuid = read_cpuid_id();
|
|
|
|
#ifdef CONFIG_IXP4XX_INDIRECT_PCI
|
|
pcibios_min_mem = 0x10000000; /* 1 GB of indirect PCI MMIO space */
|
|
#else
|
|
pcibios_min_mem = 0x48000000; /* 64 MB of PCI MMIO space */
|
|
#endif
|
|
/*
|
|
* Determine which PCI read method to use.
|
|
* Rev 0 IXP425 requires workaround.
|
|
*/
|
|
if (!(cpuid & 0xf) && cpu_is_ixp42x()) {
|
|
printk("PCI: IXP42x A0 silicon detected - "
|
|
"PCI Non-Prefetch Workaround Enabled\n");
|
|
ixp4xx_pci_read = ixp4xx_pci_read_errata;
|
|
} else
|
|
ixp4xx_pci_read = ixp4xx_pci_read_no_errata;
|
|
|
|
|
|
/* hook in our fault handler for PCI errors */
|
|
hook_fault_code(16+6, abort_handler, SIGBUS, 0,
|
|
"imprecise external abort");
|
|
|
|
pr_debug("setup PCI-AHB(inbound) and AHB-PCI(outbound) address mappings\n");
|
|
|
|
/*
|
|
* We use identity AHB->PCI address translation
|
|
* in the 0x48000000 to 0x4bffffff address space
|
|
*/
|
|
*PCI_PCIMEMBASE = 0x48494A4B;
|
|
|
|
/*
|
|
* We also use identity PCI->AHB address translation
|
|
* in 4 16MB BARs that begin at the physical memory start
|
|
*/
|
|
*PCI_AHBMEMBASE = (PHYS_OFFSET & 0xFF000000) +
|
|
((PHYS_OFFSET & 0xFF000000) >> 8) +
|
|
((PHYS_OFFSET & 0xFF000000) >> 16) +
|
|
((PHYS_OFFSET & 0xFF000000) >> 24) +
|
|
0x00010203;
|
|
|
|
if (*PCI_CSR & PCI_CSR_HOST) {
|
|
printk("PCI: IXP4xx is host\n");
|
|
|
|
pr_debug("setup BARs in controller\n");
|
|
|
|
/*
|
|
* We configure the PCI inbound memory windows to be
|
|
* 1:1 mapped to SDRAM
|
|
*/
|
|
local_write_config(PCI_BASE_ADDRESS_0, 4, PHYS_OFFSET);
|
|
local_write_config(PCI_BASE_ADDRESS_1, 4, PHYS_OFFSET + SZ_16M);
|
|
local_write_config(PCI_BASE_ADDRESS_2, 4, PHYS_OFFSET + SZ_32M);
|
|
local_write_config(PCI_BASE_ADDRESS_3, 4, PHYS_OFFSET + SZ_48M);
|
|
|
|
/*
|
|
* Enable CSR window at 64 MiB to allow PCI masters
|
|
* to continue prefetching past 64 MiB boundary.
|
|
*/
|
|
local_write_config(PCI_BASE_ADDRESS_4, 4, PHYS_OFFSET + SZ_64M);
|
|
|
|
/*
|
|
* Enable the IO window to be way up high, at 0xfffffc00
|
|
*/
|
|
local_write_config(PCI_BASE_ADDRESS_5, 4, 0xfffffc01);
|
|
} else {
|
|
printk("PCI: IXP4xx is target - No bus scan performed\n");
|
|
}
|
|
|
|
printk("PCI: IXP4xx Using %s access for memory space\n",
|
|
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
|
|
"direct"
|
|
#else
|
|
"indirect"
|
|
#endif
|
|
);
|
|
|
|
pr_debug("clear error bits in ISR\n");
|
|
*PCI_ISR = PCI_ISR_PSE | PCI_ISR_PFE | PCI_ISR_PPE | PCI_ISR_AHBE;
|
|
|
|
/*
|
|
* Set Initialize Complete in PCI Control Register: allow IXP4XX to
|
|
* respond to PCI configuration cycles. Specify that the AHB bus is
|
|
* operating in big endian mode. Set up byte lane swapping between
|
|
* little-endian PCI and the big-endian AHB bus
|
|
*/
|
|
#ifdef __ARMEB__
|
|
*PCI_CSR = PCI_CSR_IC | PCI_CSR_ABE | PCI_CSR_PDS | PCI_CSR_ADS;
|
|
#else
|
|
*PCI_CSR = PCI_CSR_IC | PCI_CSR_ABE;
|
|
#endif
|
|
|
|
pr_debug("DONE\n");
|
|
}
|
|
|
|
int ixp4xx_setup(int nr, struct pci_sys_data *sys)
|
|
{
|
|
struct resource *res;
|
|
|
|
if (nr >= 1)
|
|
return 0;
|
|
|
|
res = kzalloc(sizeof(*res) * 2, GFP_KERNEL);
|
|
if (res == NULL) {
|
|
/*
|
|
* If we're out of memory this early, something is wrong,
|
|
* so we might as well catch it here.
|
|
*/
|
|
panic("PCI: unable to allocate resources?\n");
|
|
}
|
|
|
|
local_write_config(PCI_COMMAND, 2, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
|
|
|
|
res[0].name = "PCI I/O Space";
|
|
res[0].start = 0x00000000;
|
|
res[0].end = 0x0000ffff;
|
|
res[0].flags = IORESOURCE_IO;
|
|
|
|
res[1].name = "PCI Memory Space";
|
|
res[1].start = PCIBIOS_MIN_MEM;
|
|
res[1].end = PCIBIOS_MAX_MEM;
|
|
res[1].flags = IORESOURCE_MEM;
|
|
|
|
request_resource(&ioport_resource, &res[0]);
|
|
request_resource(&iomem_resource, &res[1]);
|
|
|
|
sys->resource[0] = &res[0];
|
|
sys->resource[1] = &res[1];
|
|
sys->resource[2] = NULL;
|
|
|
|
platform_notify = ixp4xx_pci_platform_notify;
|
|
platform_notify_remove = ixp4xx_pci_platform_notify_remove;
|
|
|
|
return 1;
|
|
}
|
|
|
|
struct pci_bus * __devinit ixp4xx_scan_bus(int nr, struct pci_sys_data *sys)
|
|
{
|
|
return pci_scan_bus(sys->busnr, &ixp4xx_ops, sys);
|
|
}
|
|
|
|
int dma_set_coherent_mask(struct device *dev, u64 mask)
|
|
{
|
|
if (mask >= SZ_64M - 1)
|
|
return 0;
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ixp4xx_pci_read);
|
|
EXPORT_SYMBOL(ixp4xx_pci_write);
|
|
EXPORT_SYMBOL(dma_set_coherent_mask);
|