linux/arch/sh/drivers/pci/pci-sh7751.c
Paul Mundt d076d2bd0d sh: pci-sh7751: Initialize io_map_base in controller definition.
As there is only a single controller and remapping has no impact for the
address range in question, just initialize it directly in the controller
definition. This fixes up boot time warnings about not having the field
initialized.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2009-05-26 23:10:15 +09:00

188 lines
5.4 KiB
C

/*
* Low-Level PCI Support for the SH7751
*
* Copyright (C) 2003 - 2009 Paul Mundt
* Copyright (C) 2001 Dustin McIntire
*
* With cleanup by Paul van Gool <pvangool@mimotech.com>, 2003.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/io.h>
#include "pci-sh4.h"
#include <asm/addrspace.h>
static int __init __area_sdram_check(struct pci_channel *chan,
unsigned int area)
{
unsigned long word;
word = __raw_readl(SH7751_BCR1);
/* check BCR for SDRAM in area */
if (((word >> area) & 1) == 0) {
printk("PCI: Area %d is not configured for SDRAM. BCR1=0x%lx\n",
area, word);
return 0;
}
pci_write_reg(chan, word, SH4_PCIBCR1);
word = __raw_readw(SH7751_BCR2);
/* check BCR2 for 32bit SDRAM interface*/
if (((word >> (area << 1)) & 0x3) != 0x3) {
printk("PCI: Area %d is not 32 bit SDRAM. BCR2=0x%lx\n",
area, word);
return 0;
}
pci_write_reg(chan, word, SH4_PCIBCR2);
return 1;
}
static struct resource sh7751_io_resource = {
.name = "SH7751_IO",
.start = SH7751_PCI_IO_BASE,
.end = SH7751_PCI_IO_BASE + SH7751_PCI_IO_SIZE - 1,
.flags = IORESOURCE_IO
};
static struct resource sh7751_mem_resource = {
.name = "SH7751_mem",
.start = SH7751_PCI_MEMORY_BASE,
.end = SH7751_PCI_MEMORY_BASE + SH7751_PCI_MEM_SIZE - 1,
.flags = IORESOURCE_MEM
};
static struct pci_channel sh7751_pci_controller = {
.pci_ops = &sh4_pci_ops,
.mem_resource = &sh7751_mem_resource,
.mem_offset = 0x00000000,
.io_resource = &sh7751_io_resource,
.io_offset = 0x00000000,
.io_map_base = SH7751_PCI_IO_BASE,
};
static struct sh4_pci_address_map sh7751_pci_map = {
.window0 = {
.base = SH7751_CS3_BASE_ADDR,
.size = 0x04000000,
},
};
static int __init sh7751_pci_init(void)
{
struct pci_channel *chan = &sh7751_pci_controller;
unsigned int id;
u32 word, reg;
int ret;
printk(KERN_NOTICE "PCI: Starting intialization.\n");
chan->reg_base = 0xfe200000;
/* check for SH7751/SH7751R hardware */
id = pci_read_reg(chan, SH7751_PCICONF0);
if (id != ((SH7751_DEVICE_ID << 16) | SH7751_VENDOR_ID) &&
id != ((SH7751R_DEVICE_ID << 16) | SH7751_VENDOR_ID)) {
pr_debug("PCI: This is not an SH7751(R) (%x)\n", id);
return -ENODEV;
}
if ((ret = sh4_pci_check_direct(chan)) != 0)
return ret;
/* Set the BCR's to enable PCI access */
reg = ctrl_inl(SH7751_BCR1);
reg |= 0x80000;
ctrl_outl(reg, SH7751_BCR1);
/* Turn the clocks back on (not done in reset)*/
pci_write_reg(chan, 0, SH4_PCICLKR);
/* Clear Powerdown IRQ's (not done in reset) */
word = SH4_PCIPINT_D3 | SH4_PCIPINT_D0;
pci_write_reg(chan, word, SH4_PCIPINT);
/* set the command/status bits to:
* Wait Cycle Control + Parity Enable + Bus Master +
* Mem space enable
*/
word = SH7751_PCICONF1_WCC | SH7751_PCICONF1_PER |
SH7751_PCICONF1_BUM | SH7751_PCICONF1_MES;
pci_write_reg(chan, word, SH7751_PCICONF1);
/* define this host as the host bridge */
word = PCI_BASE_CLASS_BRIDGE << 24;
pci_write_reg(chan, word, SH7751_PCICONF2);
/* Set IO and Mem windows to local address
* Make PCI and local address the same for easy 1 to 1 mapping
*/
word = sh7751_pci_map.window0.size - 1;
pci_write_reg(chan, word, SH4_PCILSR0);
/* Set the values on window 0 PCI config registers */
word = P2SEGADDR(sh7751_pci_map.window0.base);
pci_write_reg(chan, word, SH4_PCILAR0);
pci_write_reg(chan, word, SH7751_PCICONF5);
/* Set the local 16MB PCI memory space window to
* the lowest PCI mapped address
*/
word = chan->mem_resource->start & SH4_PCIMBR_MASK;
pr_debug("PCI: Setting upper bits of Memory window to 0x%x\n", word);
pci_write_reg(chan, word , SH4_PCIMBR);
/* Make sure the MSB's of IO window are set to access PCI space
* correctly */
word = chan->io_resource->start & SH4_PCIIOBR_MASK;
pr_debug("PCI: Setting upper bits of IO window to 0x%x\n", word);
pci_write_reg(chan, word, SH4_PCIIOBR);
/* Set PCI WCRx, BCRx's, copy from BSC locations */
/* check BCR for SDRAM in specified area */
switch (sh7751_pci_map.window0.base) {
case SH7751_CS0_BASE_ADDR: word = __area_sdram_check(chan, 0); break;
case SH7751_CS1_BASE_ADDR: word = __area_sdram_check(chan, 1); break;
case SH7751_CS2_BASE_ADDR: word = __area_sdram_check(chan, 2); break;
case SH7751_CS3_BASE_ADDR: word = __area_sdram_check(chan, 3); break;
case SH7751_CS4_BASE_ADDR: word = __area_sdram_check(chan, 4); break;
case SH7751_CS5_BASE_ADDR: word = __area_sdram_check(chan, 5); break;
case SH7751_CS6_BASE_ADDR: word = __area_sdram_check(chan, 6); break;
}
if (!word)
return -1;
/* configure the wait control registers */
word = ctrl_inl(SH7751_WCR1);
pci_write_reg(chan, word, SH4_PCIWCR1);
word = ctrl_inl(SH7751_WCR2);
pci_write_reg(chan, word, SH4_PCIWCR2);
word = ctrl_inl(SH7751_WCR3);
pci_write_reg(chan, word, SH4_PCIWCR3);
word = ctrl_inl(SH7751_MCR);
pci_write_reg(chan, word, SH4_PCIMCR);
/* NOTE: I'm ignoring the PCI error IRQs for now..
* TODO: add support for the internal error interrupts and
* DMA interrupts...
*/
pci_fixup_pcic(chan);
/* SH7751 init done, set central function init complete */
/* use round robin mode to stop a device starving/overruning */
word = SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_ARBM;
pci_write_reg(chan, word, SH4_PCICR);
register_pci_controller(chan);
return 0;
}
arch_initcall(sh7751_pci_init);