pci.c

u-boot 源代码

/*
 * Copyright (C) Freescale Semiconductor, Inc. 2006. All rights reserved.
 *
 * 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>

#ifdef CONFIG_PCI

#include <asm/mmu.h>
#include <asm/global_data.h>
#include <pci.h>
#include <asm/mpc8349_pci.h>
#include <i2c.h>
#if defined(CONFIG_OF_FLAT_TREE)
#include <ft_build.h>
#elif defined(CONFIG_OF_LIBFDT)
#include <libfdt.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

/* System RAM mapped to PCI space */
#define CONFIG_PCI_SYS_MEM_BUS	CFG_SDRAM_BASE
#define CONFIG_PCI_SYS_MEM_PHYS	CFG_SDRAM_BASE

#ifndef CONFIG_PCI_PNP
static struct pci_config_table pci_mpc8349itx_config_table[] = {
	{
	 PCI_ANY_ID,
	 PCI_ANY_ID,
	 PCI_ANY_ID,
	 PCI_ANY_ID,
	 PCI_IDSEL_NUMBER,
	 PCI_ANY_ID,
	 pci_cfgfunc_config_device,
	 {
	  PCI_ENET0_IOADDR,
	  PCI_ENET0_MEMADDR,
	  PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER}
	 },
	{}
};
#endif

static struct pci_controller pci_hose[] = {
	{
#ifndef CONFIG_PCI_PNP
	      config_table:pci_mpc8349itx_config_table,
#endif
	 },
	{
#ifndef CONFIG_PCI_PNP
	      config_table:pci_mpc8349itx_config_table,
#endif
	 }
};

/**************************************************************************
 * pci_init_board()
 *
 * NOTICE: PCI2 is not currently supported
 *
 */
void pci_init_board(void)
{
	volatile immap_t *immr;
	volatile clk83xx_t *clk;
	volatile law83xx_t *pci_law;
	volatile pot83xx_t *pci_pot;
	volatile pcictrl83xx_t *pci_ctrl;
	volatile pciconf83xx_t *pci_conf;
	u8 reg8;
	u16 reg16;
	u32 reg32;
	u32 dev;
	struct pci_controller *hose;

	immr = (immap_t *) CFG_IMMR;
	clk = (clk83xx_t *) & immr->clk;
	pci_law = immr->sysconf.pcilaw;
	pci_pot = immr->ios.pot;
	pci_ctrl = immr->pci_ctrl;
	pci_conf = immr->pci_conf;

	hose = &pci_hose[0];

	/*
	 * Configure PCI controller and PCI_CLK_OUTPUT both in 66M mode
	 */

	reg32 = clk->occr;
	udelay(2000);

#ifdef CONFIG_HARD_I2C
	i2c_set_bus_num(1);
	/* Read the PCI_M66EN jumper setting */
	if ((i2c_read(CFG_I2C_8574_ADDR2, 0, 0, &reg8, sizeof(reg8)) == 0) ||
	    (i2c_read(CFG_I2C_8574A_ADDR2, 0, 0, &reg8, sizeof(reg8)) == 0)) {
		if (reg8 & I2C_8574_PCI66)
			clk->occr = 0xff000000;	/* 66 MHz PCI */
		else
			clk->occr = 0xff600001;	/* 33 MHz PCI */
	} else {
		clk->occr = 0xff600001;	/* 33 MHz PCI */
	}
#else
	clk->occr = 0xff000000;	/* 66 MHz PCI */
#endif

	udelay(2000);

	/*
	 * Release PCI RST Output signal
	 */
	pci_ctrl[0].gcr = 0;
	udelay(2000);
	pci_ctrl[0].gcr = 1;

#ifdef CONFIG_MPC83XX_PCI2
	pci_ctrl[1].gcr = 0;
	udelay(2000);
	pci_ctrl[1].gcr = 1;
#endif

	/* We need to wait at least a 1sec based on PCI specs */
	{
		int i;

		for (i = 0; i < 1000; i++)
			udelay(1000);
	}

	/*
	 * Configure PCI Local Access Windows
	 */
	pci_law[0].bar = CFG_PCI1_MEM_PHYS & LAWBAR_BAR;
	pci_law[0].ar = LAWAR_EN | LAWAR_SIZE_1G;

	pci_law[1].bar = CFG_PCI1_IO_PHYS & LAWBAR_BAR;
	pci_law[1].ar = LAWAR_EN | LAWAR_SIZE_32M;

	/*
	 * Configure PCI Outbound Translation Windows
	 */

	/* PCI1 mem space - prefetch */
	pci_pot[0].potar = (CFG_PCI1_MEM_BASE >> 12) & POTAR_TA_MASK;
	pci_pot[0].pobar = (CFG_PCI1_MEM_PHYS >> 12) & POBAR_BA_MASK;
	pci_pot[0].pocmr = POCMR_EN | POCMR_PREFETCH_EN | POCMR_CM_256M;

	/* PCI1 IO space */
	pci_pot[1].potar = (CFG_PCI1_IO_BASE >> 12) & POTAR_TA_MASK;
	pci_pot[1].pobar = (CFG_PCI1_IO_PHYS >> 12) & POBAR_BA_MASK;
	pci_pot[1].pocmr = POCMR_EN | POCMR_IO | POCMR_CM_16M;

	/* PCI1 mmio - non-prefetch mem space */
	pci_pot[2].potar = (CFG_PCI1_MMIO_BASE >> 12) & POTAR_TA_MASK;
	pci_pot[2].pobar = (CFG_PCI1_MMIO_PHYS >> 12) & POBAR_BA_MASK;
	pci_pot[2].pocmr = POCMR_EN | POCMR_CM_256M;

	/*
	 * Configure PCI Inbound Translation Windows
	 */

	/* we need RAM mapped to PCI space for the devices to
	 * access main memory */
	pci_ctrl[0].pitar1 = 0x0;
	pci_ctrl[0].pibar1 = 0x0;
	pci_ctrl[0].piebar1 = 0x0;
	pci_ctrl[0].piwar1 = PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP |
	    PIWAR_WTT_SNOOP | (__ilog2(gd->ram_size) - 1);

	hose->first_busno = 0;
	hose->last_busno = 0xff;

	/* PCI memory prefetch space */
	pci_set_region(hose->regions + 0,
		       CFG_PCI1_MEM_BASE,
		       CFG_PCI1_MEM_PHYS,
		       CFG_PCI1_MEM_SIZE, PCI_REGION_MEM | PCI_REGION_PREFETCH);

	/* PCI memory space */
	pci_set_region(hose->regions + 1,
		       CFG_PCI1_MMIO_BASE,
		       CFG_PCI1_MMIO_PHYS, CFG_PCI1_MMIO_SIZE, PCI_REGION_MEM);

	/* PCI IO space */
	pci_set_region(hose->regions + 2,
		       CFG_PCI1_IO_BASE,
		       CFG_PCI1_IO_PHYS, CFG_PCI1_IO_SIZE, PCI_REGION_IO);

	/* System memory space */
	pci_set_region(hose->regions + 3,
		       CONFIG_PCI_SYS_MEM_BUS,
		       CONFIG_PCI_SYS_MEM_PHYS,
		       gd->ram_size, PCI_REGION_MEM | PCI_REGION_MEMORY);

	hose->region_count = 4;

	pci_setup_indirect(hose,
			   (CFG_IMMR + 0x8300), (CFG_IMMR + 0x8304));

	pci_register_hose(hose);

	/*
	 * Write to Command register
	 */
	reg16 = 0xff;
	dev = PCI_BDF(hose->first_busno, 0, 0);
	pci_hose_read_config_word(hose, dev, PCI_COMMAND, &reg16);
	reg16 |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
	pci_hose_write_config_word(hose, dev, PCI_COMMAND, reg16);

	/*
	 * Clear non-reserved bits in status register.
	 */
	pci_hose_write_config_word(hose, dev, PCI_STATUS, 0xffff);
	pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
	pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);

#ifdef CONFIG_PCI_SCAN_SHOW
	printf("PCI:   Bus Dev VenId DevId Class Int\n");
#endif
	/*
	 * Hose scan.
	 */
	hose->last_busno = pci_hose_scan(hose);

#ifdef CONFIG_MPC83XX_PCI2
	hose = &pci_hose[1];

	/*
	 * Configure PCI Outbound Translation Windows
	 */

	/* PCI2 mem space - prefetch */
	pci_pot[3].potar = (CFG_PCI2_MEM_BASE >> 12) & POTAR_TA_MASK;
	pci_pot[3].pobar = (CFG_PCI2_MEM_PHYS >> 12) & POBAR_BA_MASK;
	pci_pot[3].pocmr = POCMR_EN | POCMR_PCI2 | POCMR_PREFETCH_EN | POCMR_CM_256M;

	/* PCI2 IO space */
	pci_pot[4].potar = (CFG_PCI2_IO_BASE >> 12) & POTAR_TA_MASK;
	pci_pot[4].pobar = (CFG_PCI2_IO_PHYS >> 12) & POBAR_BA_MASK;
	pci_pot[4].pocmr = POCMR_EN | POCMR_PCI2 | POCMR_IO | POCMR_CM_16M;

	/* PCI2 mmio - non-prefetch mem space */
	pci_pot[5].potar = (CFG_PCI2_MMIO_BASE >> 12) & POTAR_TA_MASK;
	pci_pot[5].pobar = (CFG_PCI2_MMIO_PHYS >> 12) & POBAR_BA_MASK;
	pci_pot[5].pocmr = POCMR_EN | POCMR_PCI2 | POCMR_CM_256M;

	/*
	 * Configure PCI Inbound Translation Windows
	 */

	/* we need RAM mapped to PCI space for the devices to
	 * access main memory */
	pci_ctrl[1].pitar1 = 0x0;
	pci_ctrl[1].pibar1 = 0x0;
	pci_ctrl[1].piebar1 = 0x0;
	pci_ctrl[1].piwar1 =
	    PIWAR_EN | PIWAR_PF | PIWAR_RTT_SNOOP | PIWAR_WTT_SNOOP |
	    (__ilog2(gd->ram_size) - 1);

	hose->first_busno = pci_hose[0].last_busno + 1;
	hose->last_busno = 0xff;

	/* PCI memory prefetch space */
	pci_set_region(hose->regions + 0,
		       CFG_PCI2_MEM_BASE,
		       CFG_PCI2_MEM_PHYS,
		       CFG_PCI2_MEM_SIZE, PCI_REGION_MEM | PCI_REGION_PREFETCH);

	/* PCI memory space */
	pci_set_region(hose->regions + 1,
		       CFG_PCI2_MMIO_BASE,
		       CFG_PCI2_MMIO_PHYS, CFG_PCI2_MMIO_SIZE, PCI_REGION_MEM);

	/* PCI IO space */
	pci_set_region(hose->regions + 2,
		       CFG_PCI2_IO_BASE,
		       CFG_PCI2_IO_PHYS, CFG_PCI2_IO_SIZE, PCI_REGION_IO);

	/* System memory space */
	pci_set_region(hose->regions + 3,
		       CONFIG_PCI_SYS_MEM_BUS,
		       CONFIG_PCI_SYS_MEM_PHYS,
		       gd->ram_size, PCI_REGION_MEM | PCI_REGION_MEMORY);

	hose->region_count = 4;

	pci_setup_indirect(hose,
			   (CFG_IMMR + 0x8380), (CFG_IMMR + 0x8384));

	pci_register_hose(hose);

	/*
	 * Write to Command register
	 */
	reg16 = 0xff;
	dev = PCI_BDF(hose->first_busno, 0, 0);
	pci_hose_read_config_word(hose, dev, PCI_COMMAND, &reg16);
	reg16 |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
	pci_hose_write_config_word(hose, dev, PCI_COMMAND, reg16);

	/*
	 * Clear non-reserved bits in status register.
	 */
	pci_hose_write_config_word(hose, dev, PCI_STATUS, 0xffff);
	pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
	pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);

	/*
	 * Hose scan.
	 */
	hose->last_busno = pci_hose_scan(hose);
#endif
}

#if defined(CONFIG_OF_LIBFDT)
void
ft_pci_setup(void *blob, bd_t *bd)
{
	int nodeoffset;
	int err;
	int tmp[2];

	nodeoffset = fdt_path_offset(blob, "/" OF_SOC "/pci@8500");
	if (nodeoffset >= 0) {
		tmp[0] = cpu_to_be32(pci_hose[0].first_busno);
		tmp[1] = cpu_to_be32(pci_hose[0].last_busno);
		err = fdt_setprop(blob, nodeoffset, "bus-range",
				  tmp, sizeof(tmp));

		tmp[0] = cpu_to_be32(gd->pci_clk);
		err = fdt_setprop(blob, nodeoffset, "clock-frequency",
				  tmp, sizeof(tmp[0]));
	}
#ifdef CONFIG_MPC83XX_PCI2
	nodeoffset = fdt_path_offset(blob, "/" OF_SOC "/pci@8500");
	if (nodeoffset >= 0) {
		tmp[0] = cpu_to_be32(pci_hose[1].first_busno);
		tmp[1] = cpu_to_be32(pci_hose[1].last_busno);
		err = fdt_setprop(blob, nodeoffset, "bus-range",
				  tmp, sizeof(tmp));

		tmp[0] = cpu_to_be32(gd->pci_clk);
		err = fdt_setprop(blob, nodeoffset, "clock-frequency",
				  tmp, sizeof(tmp[0]));
	}
#endif
}
#elif defined(CONFIG_OF_FLAT_TREE)
void
ft_pci_setup(void *blob, bd_t *bd)
{
       	u32 *p;
       	int len;

       	p = (u32 *)ft_get_prop(blob, "/" OF_SOC "/pci@8500/bus-range", &len);
       	if (p != NULL) {
		p[0] = pci_hose[0].first_busno;
		p[1] = pci_hose[0].last_busno;
       	}

#ifdef CONFIG_MPC83XX_PCI2
	p = (u32 *)ft_get_prop(blob, "/" OF_SOC "/pci@8600/bus-range", &len);
	if (p != NULL) {
		p[0] = pci_hose[1].first_busno;
		p[1] = pci_hose[1].last_busno;
	}
#endif
}
#endif /* CONFIG_OF_FLAT_TREE */
#endif /* CONFIG_PCI */