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u-boot/drivers/pci/pci_sh7751.c
Pali Rohár 2a67bf65dd pci: sh7751: Fix access to config space via PCI_CONF1_ADDRESS() macro 
sh7751 platform uses standard format of Config Address for PCI
Configuration Mechanism #1.

Commit 72c2f4acd7 ("pci: sh7751: Convert to DM and DT probing") which did
conversion of PCI sh7751 driver to DM, broke access to config space as that
commit somehow swapped device and function bits in config address.

Fix all these issues by using new U-Boot macro PCI_CONF1_ADDRESS() which
calculates Config Address correctly.

Also remove nonsense function sh7751_pci_addr_valid() which was introduced
in commit 72c2f4acd7 ("pci: sh7751: Convert to DM and DT probing")
probably due to workarounded issues with mixing/swapping device and
function bits of config address which probably resulted in non-working
access to some devices. With correct composing of config address there
should not be such issue anymore.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 72c2f4acd7 ("pci: sh7751: Convert to DM and DT probing")
Cc: Marek Vasut <marek.vasut+renesas@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-01-12 14:21:24 -05:00

209 lines
6.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
/*
* SH7751 PCI Controller (PCIC) for U-Boot.
* (C) Dustin McIntire (dustin@sensoria.com)
* (C) 2007,2008 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
*/
#include <common.h>
#include <dm.h>
#include <pci.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/pci.h>
#include <linux/bitops.h>
#include <linux/delay.h>
/* Register addresses and such */
#define SH7751_BCR1 (vu_long *)0xFF800000
#define SH7751_BCR2 (vu_short *)0xFF800004
#define SH7751_WCR1 (vu_long *)0xFF800008
#define SH7751_WCR2 (vu_long *)0xFF80000C
#define SH7751_WCR3 (vu_long *)0xFF800010
#define SH7751_MCR (vu_long *)0xFF800014
#define SH7751_BCR3 (vu_short *)0xFF800050
#define SH7751_PCICONF0 (vu_long *)0xFE200000
#define SH7751_PCICONF1 (vu_long *)0xFE200004
#define SH7751_PCICONF2 (vu_long *)0xFE200008
#define SH7751_PCICONF3 (vu_long *)0xFE20000C
#define SH7751_PCICONF4 (vu_long *)0xFE200010
#define SH7751_PCICONF5 (vu_long *)0xFE200014
#define SH7751_PCICONF6 (vu_long *)0xFE200018
#define SH7751_PCICR (vu_long *)0xFE200100
#define SH7751_PCILSR0 (vu_long *)0xFE200104
#define SH7751_PCILSR1 (vu_long *)0xFE200108
#define SH7751_PCILAR0 (vu_long *)0xFE20010C
#define SH7751_PCILAR1 (vu_long *)0xFE200110
#define SH7751_PCIMBR (vu_long *)0xFE2001C4
#define SH7751_PCIIOBR (vu_long *)0xFE2001C8
#define SH7751_PCIPINT (vu_long *)0xFE2001CC
#define SH7751_PCIPINTM (vu_long *)0xFE2001D0
#define SH7751_PCICLKR (vu_long *)0xFE2001D4
#define SH7751_PCIBCR1 (vu_long *)0xFE2001E0
#define SH7751_PCIBCR2 (vu_long *)0xFE2001E4
#define SH7751_PCIWCR1 (vu_long *)0xFE2001E8
#define SH7751_PCIWCR2 (vu_long *)0xFE2001EC
#define SH7751_PCIWCR3 (vu_long *)0xFE2001F0
#define SH7751_PCIMCR (vu_long *)0xFE2001F4
#define SH7751_PCIBCR3 (vu_long *)0xFE2001F8
#define BCR1_BREQEN 0x00080000
#define PCI_SH7751_ID 0x35051054
#define PCI_SH7751R_ID 0x350E1054
#define SH7751_PCICONF1_WCC 0x00000080
#define SH7751_PCICONF1_PER 0x00000040
#define SH7751_PCICONF1_BUM 0x00000004
#define SH7751_PCICONF1_MES 0x00000002
#define SH7751_PCICONF1_CMDS 0x000000C6
#define SH7751_PCI_HOST_BRIDGE 0x6
#define SH7751_PCICR_PREFIX 0xa5000000
#define SH7751_PCICR_PRST 0x00000002
#define SH7751_PCICR_CFIN 0x00000001
#define SH7751_PCIPINT_D3 0x00000002
#define SH7751_PCIPINT_D0 0x00000001
#define SH7751_PCICLKR_PREFIX 0xa5000000
#define SH7751_PCI_MEM_BASE 0xFD000000
#define SH7751_PCI_MEM_SIZE 0x01000000
#define SH7751_PCI_IO_BASE 0xFE240000
#define SH7751_PCI_IO_SIZE 0x00040000
#define SH7751_PCIPAR (vu_long *)0xFE2001C0
#define SH7751_PCIPDR (vu_long *)0xFE200220
#define p4_in(addr) (*addr)
#define p4_out(data, addr) (*addr) = (data)
static int sh7751_pci_read_config(const struct udevice *dev, pci_dev_t bdf,
uint offset, ulong *value,
enum pci_size_t size)
{
u32 addr, reg;
addr = PCI_CONF1_ADDRESS(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset);
p4_out(addr, SH7751_PCIPAR);
reg = p4_in(SH7751_PCIPDR);
*value = pci_conv_32_to_size(reg, offset, size);
return 0;
}
static int sh7751_pci_write_config(struct udevice *dev, pci_dev_t bdf,
uint offset, ulong value,
enum pci_size_t size)
{
u32 addr, reg, old;
addr = PCI_CONF1_ADDRESS(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset);
p4_out(addr, SH7751_PCIPAR);
old = p4_in(SH7751_PCIPDR);
reg = pci_conv_size_to_32(old, value, offset, size);
p4_out(reg, SH7751_PCIPDR);
return 0;
}
static int sh7751_pci_probe(struct udevice *dev)
{
/* Double-check that we're a 7751 or 7751R chip */
if (p4_in(SH7751_PCICONF0) != PCI_SH7751_ID
&& p4_in(SH7751_PCICONF0) != PCI_SH7751R_ID) {
printf("PCI: Unknown PCI host bridge.\n");
return 1;
}
printf("PCI: SH7751 PCI host bridge found.\n");
/* Double-check some BSC config settings */
/* (Area 3 non-MPX 32-bit, PCI bus pins) */
if ((p4_in(SH7751_BCR1) & 0x20008) == 0x20000) {
printf("SH7751_BCR1 value is wrong(0x%08X)\n",
(unsigned int)p4_in(SH7751_BCR1));
return 2;
}
if ((p4_in(SH7751_BCR2) & 0xC0) != 0xC0) {
printf("SH7751_BCR2 value is wrong(0x%08X)\n",
(unsigned int)p4_in(SH7751_BCR2));
return 3;
}
if (p4_in(SH7751_BCR2) & 0x01) {
printf("SH7751_BCR2 value is wrong(0x%08X)\n",
(unsigned int)p4_in(SH7751_BCR2));
return 4;
}
/* Force BREQEN in BCR1 to allow PCIC access */
p4_out((p4_in(SH7751_BCR1) | BCR1_BREQEN), SH7751_BCR1);
/* Toggle PCI reset pin */
p4_out((SH7751_PCICR_PREFIX | SH7751_PCICR_PRST), SH7751_PCICR);
udelay(32);
p4_out(SH7751_PCICR_PREFIX, SH7751_PCICR);
/* Set cmd bits: WCC, PER, BUM, MES */
/* (Addr/Data stepping, Parity enabled, Bus Master, Memory enabled) */
p4_out(0xfb900047, SH7751_PCICONF1); /* K.Kino */
/* Define this host as the host bridge */
p4_out((SH7751_PCI_HOST_BRIDGE << 24), SH7751_PCICONF2);
/* Force PCI clock(s) on */
p4_out(0, SH7751_PCICLKR);
p4_out(0x03, SH7751_PCICLKR);
/* Clear powerdown IRQs, also mask them (unused) */
p4_out((SH7751_PCIPINT_D0 | SH7751_PCIPINT_D3), SH7751_PCIPINT);
p4_out(0, SH7751_PCIPINTM);
p4_out(0xab000001, SH7751_PCICONF4);
/* Set up target memory mappings (for external DMA access) */
/* Map both P0 and P2 range to Area 3 RAM for ease of use */
p4_out(CONFIG_SYS_SDRAM_SIZE - 0x100000, SH7751_PCILSR0);
p4_out(CONFIG_SYS_SDRAM_BASE & 0x1FF00000, SH7751_PCILAR0);
p4_out(CONFIG_SYS_SDRAM_BASE & 0xFFF00000, SH7751_PCICONF5);
p4_out(0, SH7751_PCILSR1);
p4_out(0, SH7751_PCILAR1);
p4_out(0xd0000000, SH7751_PCICONF6);
/* Map memory window to same address on PCI bus */
p4_out(SH7751_PCI_MEM_BASE, SH7751_PCIMBR);
/* Map IO window to same address on PCI bus */
p4_out(SH7751_PCI_IO_BASE, SH7751_PCIIOBR);
/* set BREQEN */
p4_out(inl(SH7751_BCR1) | 0x00080000, SH7751_BCR1);
/* Copy BSC registers into PCI BSC */
p4_out(inl(SH7751_BCR1), SH7751_PCIBCR1);
p4_out(inw(SH7751_BCR2), SH7751_PCIBCR2);
p4_out(inw(SH7751_BCR3), SH7751_PCIBCR3);
p4_out(inl(SH7751_WCR1), SH7751_PCIWCR1);
p4_out(inl(SH7751_WCR2), SH7751_PCIWCR2);
p4_out(inl(SH7751_WCR3), SH7751_PCIWCR3);
p4_out(inl(SH7751_MCR), SH7751_PCIMCR);
/* Finally, set central function init complete */
p4_out((SH7751_PCICR_PREFIX | SH7751_PCICR_CFIN), SH7751_PCICR);
return 0;
}
static const struct dm_pci_ops sh7751_pci_ops = {
.read_config = sh7751_pci_read_config,
.write_config = sh7751_pci_write_config,
};
static const struct udevice_id sh7751_pci_ids[] = {
{ .compatible = "renesas,pci-sh7751" },
{ }
};
U_BOOT_DRIVER(sh7751_pci) = {
.name = "sh7751_pci",
.id = UCLASS_PCI,
.of_match = sh7751_pci_ids,
.ops = &sh7751_pci_ops,
.probe = sh7751_pci_probe,
};
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