pci_mpc85xx.c
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// SPDX-License-Identifier: GPL-2.0
/*
* (C) Copyright 2019
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
*
*/
#include <common.h>
#include <asm/cpm_85xx.h>
#include <pci.h>
#include <dm.h>
#include <asm/fsl_law.h>
struct mpc85xx_pci_priv {
void __iomem *cfg_addr;
void __iomem *cfg_data;
};
static int mpc85xx_pci_dm_read_config(const struct udevice *dev, pci_dev_t bdf,
uint offset, ulong *value,
enum pci_size_t size)
{
struct mpc85xx_pci_priv *priv = dev_get_priv(dev);
u32 addr;
addr = bdf | (offset & 0xfc) | ((offset & 0xf00) << 16) | 0x80000000;
out_be32(priv->cfg_addr, addr);
sync();
*value = pci_conv_32_to_size(in_le32(priv->cfg_data), offset, size);
return 0;
}
static int mpc85xx_pci_dm_write_config(struct udevice *dev, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
struct mpc85xx_pci_priv *priv = dev_get_priv(dev);
u32 addr;
addr = bdf | (offset & 0xfc) | ((offset & 0xf00) << 16) | 0x80000000;
out_be32(priv->cfg_addr, addr);
sync();
out_le32(priv->cfg_data, pci_conv_size_to_32(0, value, offset, size));
return 0;
}
static int
mpc85xx_pci_dm_setup_laws(struct pci_region *io, struct pci_region *mem,
struct pci_region *pre)
{
/*
* Unfortunately we have defines for this addresse,
* as we have to setup the TLB, and at this stage
* we have no access to DT ... may we check here
* if the value in the define is the same ?
*/
if (mem)
set_next_law(mem->phys_start, law_size_bits(mem->size),
LAW_TRGT_IF_PCI);
if (io)
set_next_law(io->phys_start, law_size_bits(io->size),
LAW_TRGT_IF_PCI);
if (pre)
set_next_law(pre->phys_start, law_size_bits(pre->size),
LAW_TRGT_IF_PCI);
return 0;
}
static int mpc85xx_pci_dm_probe(struct udevice *dev)
{
struct mpc85xx_pci_priv *priv = dev_get_priv(dev);
struct pci_region *io;
struct pci_region *mem;
struct pci_region *pre;
int count;
ccsr_pcix_t *pcix;
count = pci_get_regions(dev, &io, &mem, &pre);
if (count != 2) {
printf("%s: wrong count of regions %d only 2 allowed\n",
__func__, count);
return -EINVAL;
}
mpc85xx_pci_dm_setup_laws(io, mem, pre);
pcix = priv->cfg_addr;
/* BAR 1: memory */
out_be32(&pcix->potar1, (mem->bus_start >> 12) & 0x000fffff);
out_be32(&pcix->potear1, 0);
out_be32(&pcix->powbar1, (mem->phys_start >> 12) & 0x000fffff);
out_be32(&pcix->powbear1, 0);
out_be32(&pcix->powar1, (POWAR_EN | POWAR_MEM_READ |
POWAR_MEM_WRITE | (__ilog2(mem->size) - 1)));
/* BAR 1: IO */
out_be32(&pcix->potar2, (io->bus_start >> 12) & 0x000fffff);
out_be32(&pcix->potear2, 0);
out_be32(&pcix->powbar2, (io->phys_start >> 12) & 0x000fffff);
out_be32(&pcix->powbear2, 0);
out_be32(&pcix->powar2, (POWAR_EN | POWAR_IO_READ |
POWAR_IO_WRITE | (__ilog2(io->size) - 1)));
out_be32(&pcix->pitar1, 0);
out_be32(&pcix->piwbar1, 0);
out_be32(&pcix->piwar1, (PIWAR_EN | PIWAR_PF | PIWAR_LOCAL |
PIWAR_READ_SNOOP | PIWAR_WRITE_SNOOP | PIWAR_MEM_2G));
out_be32(&pcix->powar3, 0);
out_be32(&pcix->powar4, 0);
out_be32(&pcix->piwar2, 0);
out_be32(&pcix->piwar3, 0);
return 0;
}
static int mpc85xx_pci_dm_remove(struct udevice *dev)
{
return 0;
}
static int mpc85xx_pci_ofdata_to_platdata(struct udevice *dev)
{
struct mpc85xx_pci_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
addr = devfdt_get_addr_index(dev, 0);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->cfg_addr = (void __iomem *)addr;
addr += 4;
priv->cfg_data = (void __iomem *)addr;
return 0;
}
static const struct dm_pci_ops mpc85xx_pci_ops = {
.read_config = mpc85xx_pci_dm_read_config,
.write_config = mpc85xx_pci_dm_write_config,
};
static const struct udevice_id mpc85xx_pci_ids[] = {
{ .compatible = "fsl,mpc8540-pci" },
{ }
};
U_BOOT_DRIVER(mpc85xx_pci) = {
.name = "mpc85xx_pci",
.id = UCLASS_PCI,
.of_match = mpc85xx_pci_ids,
.ops = &mpc85xx_pci_ops,
.probe = mpc85xx_pci_dm_probe,
.remove = mpc85xx_pci_dm_remove,
.ofdata_to_platdata = mpc85xx_pci_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct mpc85xx_pci_priv),
};