pci_sh7751.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 <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_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(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);
pci_sh4_init(hose);
return 0;
}