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|
/*
* 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,
|