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/*
* Support for indirect PCI bridges.
*
* Copyright (c) Freescale Semiconductor, Inc.
* 2006. All rights reserved.
*
* Jason Jin <Jason.jin@freescale.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* partly derived from
* arch/powerpc/platforms/86xx/mpc86xx_pcie.c
*/
#include <common.h>
#ifdef CONFIG_PCI
#include <asm/processor.h>
#include <asm/io.h>
#include <pci.h>
#define PCI_CFG_OUT out_be32
#define PEX_FIX out_be32(hose->cfg_addr+0x4, 0x0400ffff)
static int
indirect_read_config_pcie(struct pci_controller *hose,
pci_dev_t dev,
int offset,
int len,
u32 *val)
{
int bus = PCI_BUS(dev);
volatile unsigned char *cfg_data;
u32 temp;
PEX_FIX;
if (bus == 0xff) {
PCI_CFG_OUT(hose->cfg_addr,
dev | (offset & 0xfc) | 0x80000001);
} else {
PCI_CFG_OUT(hose->cfg_addr,
dev | (offset & 0xfc) | 0x80000000);
}
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
/* ERRATA PCI-Ex 12 - Configuration Address/Data Alignment */
cfg_data = hose->cfg_data;
PEX_FIX;
temp = in_le32((u32 *) cfg_data);
switch (len) {
case 1:
*val = (temp >> (((offset & 3)) * 8)) & 0xff;
break;
case 2:
*val = (temp >> (((offset & 3)) * 8)) & 0xffff;
break;
default:
*val = temp;
break;
}
return 0;
}
static int
indirect_write_config_pcie(struct pci_controller *hose,
pci_dev_t dev,
int offset,
int len,
u32 val)
{
int bus = PCI_BUS(dev);
volatile unsigned char *cfg_data;
u32 temp;
PEX_FIX;
if (bus == 0xff) {
PCI_CFG_OUT(hose->cfg_addr,
dev | (offset & 0xfc) | 0x80000001);
} else {
PCI_CFG_OUT(hose->cfg_addr,
dev | (offset & 0xfc) | 0x80000000);
}
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
/* ERRATA PCI-Ex 12 - Configuration Address/Data Alignment */
cfg_data = hose->cfg_data;
switch (len) {
case 1:
PEX_FIX;
temp = in_le32((u32 *) cfg_data);
temp = (temp & ~(0xff << ((offset & 3) * 8))) |
(val << ((offset & 3) * 8));
PEX_FIX;
out_le32((u32 *) cfg_data, temp);
break;
case 2:
PEX_FIX;
temp = in_le32((u32 *) cfg_data);
temp = (temp & ~(0xffff << ((offset & 3) * 8)));
temp |= (val << ((offset & 3) * 8));
PEX_FIX;
out_le32((u32 *) cfg_data, temp);
break;
default:
PEX_FIX;
out_le32((u32 *) cfg_data, val);
break;
}
PEX_FIX;
return 0;
}
static int
indirect_read_config_byte_pcie(struct pci_controller *hose,
pci_dev_t dev,
int offset,
u8 *val)
{
u32 val32;
indirect_read_config_pcie(hose, dev, offset, 1, &val32);
*val = (u8) val32;
return 0;
}
static int
indirect_read_config_word_pcie(struct pci_controller *hose,
pci_dev_t dev,
int offset,
u16 *val)
{
u32 val32;
indirect_read_config_pcie(hose, dev, offset, 2, &val32);
*val = (u16) val32;
return 0;
}
static int
indirect_read_config_dword_pcie(struct pci_controller *hose,
pci_dev_t dev,
int offset,
u32 *val)
{
return indirect_read_config_pcie(hose, dev, offset, 4, val);
}
static int
indirect_write_config_byte_pcie(struct pci_controller *hose,
pci_dev_t dev,
int offset,
u8 val)
{
return indirect_write_config_pcie(hose, dev, offset, 1, (u32) val);
}
static int
indirect_write_config_word_pcie(struct pci_controller *hose,
pci_dev_t dev,
int offset,
unsigned short val)
{
return indirect_write_config_pcie(hose, dev, offset, 2, (u32) val);
}
static int
indirect_write_config_dword_pcie(struct pci_controller *hose,
pci_dev_t dev,
int offset,
u32 val)
{
return indirect_write_config_pcie(hose, dev, offset, 4, val);
}
void
pcie_setup_indirect(struct pci_controller *hose, u32 cfg_addr, u32 cfg_data)
{
pci_set_ops(hose,
indirect_read_config_byte_pcie,
indirect_read_config_word_pcie,
indirect_read_config_dword_pcie,
indirect_write_config_byte_pcie,
indirect_write_config_word_pcie,
indirect_write_config_dword_pcie);
hose->cfg_addr = (unsigned int *)cfg_addr;
hose->cfg_data = (unsigned char *)cfg_data;
}
#endif /* CONFIG_PCI */
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