pci_sh7751.c

uboot详细解读可用启动引导LINUX2.6内核

/*
 * SH7751 PCI Controller (PCIC) for U-Boot.
 * (C) Dustin McIntire ([e-mail])
 * (C) 2007,2008 Nobuhiro Iwamatsu <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <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 0x%08X\n", p4_in(SH7751_BCR1));
		return 2;
	}
	if ((p4_in(SH7751_BCR2) & 0xC0) != 0xC0) {
		printf("SH7751_BCR2 0x%08X\n", p4_in(SH7751_BCR2));
		return 3;
	}
	if (p4_in(SH7751_BCR2) & 0x01) {
		printf("SH7751_BCR2 0x%08X\n", 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(0x2000 & 0xfffc0000, 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(inl(SH7751_BCR2), SH7751_PCIBCR2);
	p4_out(inl(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;
}