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/*
* Low-Level PCI Support for the SH7780
*
* Copyright (C) 2005 - 2010 Paul Mundt
*
* 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/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include "pci-sh4.h"
#include <asm/mmu.h>
#include <asm/sizes.h>
static struct resource sh7785_io_resource = {
.name = "SH7785_IO",
.start = 0x1000,
.end = SH7780_PCI_IO_SIZE - 1,
.flags = IORESOURCE_IO
};
static struct resource sh7785_mem_resource = {
.name = "SH7785_mem",
.start = SH7780_PCI_MEMORY_BASE,
.end = SH7780_PCI_MEMORY_BASE + SH7780_PCI_MEM_SIZE - 1,
.flags = IORESOURCE_MEM
};
static struct pci_channel sh7780_pci_controller = {
.pci_ops = &sh4_pci_ops,
.mem_resource = &sh7785_mem_resource,
.mem_offset = 0x00000000,
.io_resource = &sh7785_io_resource,
.io_offset = 0x00000000,
.io_map_base = SH7780_PCI_IO_BASE,
};
static void __init sh7780_pci66_init(struct pci_channel *hose)
{
unsigned int tmp;
if (!pci_is_66mhz_capable(hose, 0, 0))
return;
/* Enable register access */
tmp = __raw_readl(hose->reg_base + SH4_PCICR);
tmp |= SH4_PCICR_PREFIX;
__raw_writel(tmp, hose->reg_base + SH4_PCICR);
/* Enable 66MHz operation */
tmp = __raw_readw(hose->reg_base + PCI_STATUS);
tmp |= PCI_STATUS_66MHZ;
__raw_writew(tmp, hose->reg_base + PCI_STATUS);
/* Done */
tmp = __raw_readl(hose->reg_base + SH4_PCICR);
tmp |= SH4_PCICR_PREFIX | SH4_PCICR_CFIN;
__raw_writel(tmp, hose->reg_base + SH4_PCICR);
}
static int __init sh7780_pci_init(void)
{
struct pci_channel *chan = &sh7780_pci_controller;
phys_addr_t memphys;
size_t memsize;
unsigned int id;
const char *type;
int ret;
printk(KERN_NOTICE "PCI: Starting intialization.\n");
chan->reg_base = 0xfe040000;
/* Enable CPU access to the PCIC registers. */
__raw_writel(PCIECR_ENBL, PCIECR);
/* Reset */
__raw_writel(SH4_PCICR_PREFIX | SH4_PCICR_PRST,
chan->reg_base + SH4_PCICR);
/*
* Wait for it to come back up. The spec says to allow for up to
* 1 second after toggling the reset pin, but in practice 100ms
* is more than enough.
*/
mdelay(100);
id = __raw_readw(chan->reg_base + PCI_VENDOR_ID);
if (id != PCI_VENDOR_ID_RENESAS) {
printk(KERN_ERR "PCI: Unknown vendor ID 0x%04x.\n", id);
return -ENODEV;
}
id = __raw_readw(chan->reg_base + PCI_DEVICE_ID);
type = (id == PCI_DEVICE_ID_RENESAS_SH7763) ? "SH7763" :
(id == PCI_DEVICE_ID_RENESAS_SH7780) ? "SH7780" :
(id == PCI_DEVICE_ID_RENESAS_SH7781) ? "SH7781" :
(id == PCI_DEVICE_ID_RENESAS_SH7785) ? "SH7785" :
NULL;
if (unlikely(!type)) {
printk(KERN_ERR "PCI: Found an unsupported Renesas host "
"controller, device id 0x%04x.\n", id);
return -EINVAL;
}
printk(KERN_NOTICE "PCI: Found a Renesas %s host "
"controller, revision %d.\n", type,
__raw_readb(chan->reg_base + PCI_REVISION_ID));
/*
* Now throw it in to register initialization mode and
* start the real work.
*/
__raw_writel(SH4_PCICR_PREFIX, chan->reg_base + SH4_PCICR);
__raw_writel(0, chan->reg_base + PCI_BASE_ADDRESS_0);
memphys = __pa(memory_start);
memsize = roundup_pow_of_two(memory_end - memory_start);
/*
* If there's more than 512MB of memory, we need to roll over to
* LAR1/LSR1.
*/
if (memsize > SZ_512M) {
__raw_writel(memphys + SZ_512M, chan->reg_base + SH4_PCILAR1);
__raw_writel((((memsize - SZ_512M) - SZ_1M) & 0x1ff00000) | 1,
chan->reg_base + SH4_PCILSR1);
memsize = SZ_512M;
} else {
/*
* Otherwise just zero it out and disable it.
*/
__raw_writel(0, chan->reg_base + SH4_PCILAR1);
__raw_writel(0, chan->reg_base + SH4_PCILSR1);
}
/*
* LAR0/LSR0 covers up to the first 512MB, which is enough to
* cover all of lowmem on most platforms.
*/
__raw_writel(memphys, chan->reg_base + SH4_PCILAR0);
__raw_writel(((memsize - SZ_1M) & 0x1ff00000) | 1,
chan->reg_base + SH4_PCILSR0);
/* Clear out PCI arbiter IRQs */
__raw_writel(0, chan->reg_base + SH4_PCIAINT);
/* Unmask all of the arbiter IRQs. */
__raw_writel(SH4_PCIAINT_MBKN | SH4_PCIAINT_TBTO | SH4_PCIAINT_MBTO | \
SH4_PCIAINT_TABT | SH4_PCIAINT_MABT | SH4_PCIAINT_RDPE | \
SH4_PCIAINT_WDPE, chan->reg_base + SH4_PCIAINTM);
/* Clear all error conditions */
__raw_writew(PCI_STATUS_DETECTED_PARITY | \
PCI_STATUS_SIG_SYSTEM_ERROR | \
PCI_STATUS_REC_MASTER_ABORT | \
PCI_STATUS_REC_TARGET_ABORT | \
PCI_STATUS_SIG_TARGET_ABORT | \
PCI_STATUS_PARITY, chan->reg_base + PCI_STATUS);
__raw_writew(PCI_COMMAND_SERR | PCI_COMMAND_WAIT | \
PCI_COMMAND_PARITY | PCI_COMMAND_MASTER | \
PCI_COMMAND_MEMORY, chan->reg_base + PCI_COMMAND);
/* Unmask all of the PCI IRQs */
__raw_writel(SH4_PCIINTM_TTADIM | SH4_PCIINTM_TMTOIM | \
SH4_PCIINTM_MDEIM | SH4_PCIINTM_APEDIM | \
SH4_PCIINTM_SDIM | SH4_PCIINTM_DPEITWM | \
SH4_PCIINTM_PEDITRM | SH4_PCIINTM_TADIMM | \
SH4_PCIINTM_MADIMM | SH4_PCIINTM_MWPDIM | \
SH4_PCIINTM_MRDPEIM, chan->reg_base + SH4_PCIINTM);
/*
* Disable the cache snoop controller for non-coherent DMA.
*/
__raw_writel(0, chan->reg_base + SH7780_PCICSCR0);
__raw_writel(0, chan->reg_base + SH7780_PCICSAR0);
__raw_writel(0, chan->reg_base + SH7780_PCICSCR1);
__raw_writel(0, chan->reg_base + SH7780_PCICSAR1);
__raw_writel(0xfd000000, chan->reg_base + SH7780_PCIMBR0);
__raw_writel(0x00fc0000, chan->reg_base + SH7780_PCIMBMR0);
__raw_writel(0, chan->reg_base + SH7780_PCIIOBR);
__raw_writel(0, chan->reg_base + SH7780_PCIIOBMR);
/*
* Initialization mode complete, release the control register and
* enable round robin mode to stop device overruns/starvation.
*/
__raw_writel(SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_FTO,
chan->reg_base + SH4_PCICR);
ret = register_pci_controller(chan);
if (unlikely(ret))
return ret;
sh7780_pci66_init(chan);
printk(KERN_NOTICE "PCI: Running at %dMHz.\n",
(__raw_readw(chan->reg_base + PCI_STATUS) & PCI_STATUS_66MHZ) ?
66 : 33);
return 0;
}
arch_initcall(sh7780_pci_init);
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