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d44cf293a1
u-boot-brain/drivers/pci/pci_sh7751.c
Vladimir Zapolskiy d44cf293a1 pci: sh7751: fix up PCI I/O space address 
The change actually maps PCI I/O window to the same address on PCI bus
as it is stated by a comment, before the change transfers to the PCI I/O
space are failed due to misconfiguration of the most significant 14 bits
of the PCI address in PCIIOBR (note that it is set to 0x0).

Most probably the problem remained unnoticed, because communcation
to all tested PCI devices is done over PCI memory space only.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
2016-12-02 21:32:43 -05:00

188 lines
5.8 KiB
C
Raw Blame History

/*
* SH7751 PCI Controller (PCIC) for U-Boot.
* (C) Dustin McIntire (dustin@sensoria.com)
* (C) 2007,2008 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <pci.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/pci.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_CS3_BASE_ADDR 0x0C000000
#define SH7751_P2CS3_BASE_ADDR 0xAC000000
#define SH7751_PCIPAR (vu_long *)0xFE2001C0
#define SH7751_PCIPDR (vu_long *)0xFE200220
#define p4_in(addr) (*addr)
#define p4_out(data, addr) (*addr) = (data)
/* Double word */
int pci_sh4_read_config_dword(struct pci_controller *hose,
pci_dev_t dev, int offset, u32 *value)
{
u32 par_data = 0x80000000 | dev;
p4_out(par_data | (offset & 0xfc), SH7751_PCIPAR);
*value = p4_in(SH7751_PCIPDR);
return 0;
}
int pci_sh4_write_config_dword(struct pci_controller *hose,
pci_dev_t dev, int offset, u32 value)
{
u32 par_data = 0x80000000 | dev;
p4_out(par_data | (offset & 0xfc), SH7751_PCIPAR);
p4_out(value, SH7751_PCIPDR);
return 0;
}
int pci_sh7751_init(struct pci_controller *hose)
{
/* 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((64 - 1) << 20, SH7751_PCILSR0);
p4_out(SH7751_CS3_BASE_ADDR, SH7751_PCILAR0);
p4_out(0, SH7751_PCILSR1);
p4_out(0, SH7751_PCILAR1);
p4_out(SH7751_CS3_BASE_ADDR, SH7751_PCICONF5);
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);
pci_sh4_init(hose);
return 0;
}
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