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android_kernel_samsung_msm8976/arch/arm/mach-ks8695/pci.c
Russell King c23bfc3835 ARM: PCI: provide a default bus scan implementation 
Most PCI implementations perform simple root bus scanning.  Rather than
having each group of platforms provide a duplicated bus scan function,
provide the PCI configuration ops structure via the hw_pci structure,
and call the root bus scanning function from core ARM PCI code.

Acked-by: Krzysztof Hałasa <khc@pm.waw.pl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-05-13 17:12:17 +01:00

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/*
* arch/arm/mach-ks8695/pci.c
*
* Copyright (C) 2003, Micrel Semiconductors
* Copyright (C) 2006, Greg Ungerer <gerg@snapgear.com>
* Copyright (C) 2006, Ben Dooks
* Copyright (C) 2007, Andrew Victor
*
* 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 <linux/kernel.h>
#include <linux/pci.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <asm/signal.h>
#include <asm/mach/pci.h>
#include <mach/hardware.h>
#include <mach/devices.h>
#include <mach/regs-pci.h>
static int pci_dbg;
static int pci_cfg_dbg;
static void ks8695_pci_setupconfig(unsigned int bus_nr, unsigned int devfn, unsigned int where)
{
unsigned long pbca;
pbca = PBCA_ENABLE | (where & ~3);
pbca |= PCI_SLOT(devfn) << 11 ;
pbca |= PCI_FUNC(devfn) << 8;
pbca |= bus_nr << 16;
if (bus_nr == 0) {
/* use Type-0 transaction */
__raw_writel(pbca, KS8695_PCI_VA + KS8695_PBCA);
} else {
/* use Type-1 transaction */
__raw_writel(pbca | PBCA_TYPE1, KS8695_PCI_VA + KS8695_PBCA);
}
}
/*
* The KS8695 datasheet prohibits anything other than 32bit accesses
* to the IO registers, so all our configuration must be done with
* 32bit operations, and the correct bit masking and shifting.
*/
static int ks8695_pci_readconfig(struct pci_bus *bus,
unsigned int devfn, int where, int size, u32 *value)
{
ks8695_pci_setupconfig(bus->number, devfn, where);
*value = __raw_readl(KS8695_PCI_VA + KS8695_PBCD);
switch (size) {
case 4:
break;
case 2:
*value = *value >> ((where & 2) * 8);
*value &= 0xffff;
break;
case 1:
*value = *value >> ((where & 3) * 8);
*value &= 0xff;
break;
}
if (pci_cfg_dbg) {
printk("read: %d,%08x,%02x,%d: %08x (%08x)\n",
bus->number, devfn, where, size, *value,
__raw_readl(KS8695_PCI_VA + KS8695_PBCD));
}
return PCIBIOS_SUCCESSFUL;
}
static int ks8695_pci_writeconfig(struct pci_bus *bus,
unsigned int devfn, int where, int size, u32 value)
{
unsigned long tmp;
if (pci_cfg_dbg) {
printk("write: %d,%08x,%02x,%d: %08x\n",
bus->number, devfn, where, size, value);
}
ks8695_pci_setupconfig(bus->number, devfn, where);
switch (size) {
case 4:
__raw_writel(value, KS8695_PCI_VA + KS8695_PBCD);
break;
case 2:
tmp = __raw_readl(KS8695_PCI_VA + KS8695_PBCD);
tmp &= ~(0xffff << ((where & 2) * 8));
tmp |= value << ((where & 2) * 8);
__raw_writel(tmp, KS8695_PCI_VA + KS8695_PBCD);
break;
case 1:
tmp = __raw_readl(KS8695_PCI_VA + KS8695_PBCD);
tmp &= ~(0xff << ((where & 3) * 8));
tmp |= value << ((where & 3) * 8);
__raw_writel(tmp, KS8695_PCI_VA + KS8695_PBCD);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static void ks8695_local_writeconfig(int where, u32 value)
{
ks8695_pci_setupconfig(0, 0, where);
__raw_writel(value, KS8695_PCI_VA + KS8695_PBCD);
}
static struct pci_ops ks8695_pci_ops = {
.read = ks8695_pci_readconfig,
.write = ks8695_pci_writeconfig,
};
static struct resource pci_mem = {
.name = "PCI Memory space",
.start = KS8695_PCIMEM_PA,
.end = KS8695_PCIMEM_PA + (KS8695_PCIMEM_SIZE - 1),
.flags = IORESOURCE_MEM,
};
static struct resource pci_io = {
.name = "PCI IO space",
.start = KS8695_PCIIO_PA,
.end = KS8695_PCIIO_PA + (KS8695_PCIIO_SIZE - 1),
.flags = IORESOURCE_IO,
};
static int __init ks8695_pci_setup(int nr, struct pci_sys_data *sys)
{
if (nr > 0)
return 0;
request_resource(&iomem_resource, &pci_mem);
request_resource(&ioport_resource, &pci_io);
pci_add_resource_offset(&sys->resources, &pci_io, sys->io_offset);
pci_add_resource_offset(&sys->resources, &pci_mem, sys->mem_offset);
/* Assign and enable processor bridge */
ks8695_local_writeconfig(PCI_BASE_ADDRESS_0, KS8695_PCIMEM_PA);
/* Enable bus-master & Memory Space access */
ks8695_local_writeconfig(PCI_COMMAND, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
/* Set cache-line size & latency. */
ks8695_local_writeconfig(PCI_CACHE_LINE_SIZE, (32 << 8) | (L1_CACHE_BYTES / sizeof(u32)));
/* Reserve PCI memory space for PCI-AHB resources */
if (!request_mem_region(KS8695_PCIMEM_PA, SZ_64M, "PCI-AHB Bridge")) {
printk(KERN_ERR "Cannot allocate PCI-AHB Bridge memory.\n");
return -EBUSY;
}
return 1;
}
static inline unsigned int size_mask(unsigned long size)
{
return (~size) + 1;
}
static int ks8695_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
{
unsigned long pc = instruction_pointer(regs);
unsigned long instr = *(unsigned long *)pc;
unsigned long cmdstat;
cmdstat = __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS);
printk(KERN_ERR "PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx [%s%s%s%s%s]\n",
addr, fsr, regs->ARM_pc, regs->ARM_lr,
cmdstat & (PCI_STATUS_SIG_TARGET_ABORT << 16) ? "GenTarget" : " ",
cmdstat & (PCI_STATUS_REC_TARGET_ABORT << 16) ? "RecvTarget" : " ",
cmdstat & (PCI_STATUS_REC_MASTER_ABORT << 16) ? "MasterAbort" : " ",
cmdstat & (PCI_STATUS_SIG_SYSTEM_ERROR << 16) ? "SysError" : " ",
cmdstat & (PCI_STATUS_DETECTED_PARITY << 16) ? "Parity" : " "
);
__raw_writel(cmdstat, KS8695_PCI_VA + KS8695_CRCFCS);
/*
* If the instruction being executed was a read,
* make it look like it read all-ones.
*/
if ((instr & 0x0c100000) == 0x04100000) {
int reg = (instr >> 12) & 15;
unsigned long val;
if (instr & 0x00400000)
val = 255;
else
val = -1;
regs->uregs[reg] = val;
regs->ARM_pc += 4;
return 0;
}
if ((instr & 0x0e100090) == 0x00100090) {
int reg = (instr >> 12) & 15;
regs->uregs[reg] = -1;
regs->ARM_pc += 4;
return 0;
}
return 1;
}
static void __init ks8695_pci_preinit(void)
{
/* make software reset to avoid freeze if PCI bus was messed up */
__raw_writel(0x80000000, KS8695_PCI_VA + KS8695_PBCS);
/* stage 1 initialization, subid, subdevice = 0x0001 */
__raw_writel(0x00010001, KS8695_PCI_VA + KS8695_CRCSID);
/* stage 2 initialization */
/* prefetch limits with 16 words, retry enable */
__raw_writel(0x40000000, KS8695_PCI_VA + KS8695_PBCS);
/* configure memory mapping */
__raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBA);
__raw_writel(size_mask(KS8695_PCIMEM_SIZE), KS8695_PCI_VA + KS8695_PMBAM);
__raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBAT);
__raw_writel(0, KS8695_PCI_VA + KS8695_PMBAC);
/* configure IO mapping */
__raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBA);
__raw_writel(size_mask(KS8695_PCIIO_SIZE), KS8695_PCI_VA + KS8695_PIOBAM);
__raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBAT);
__raw_writel(0, KS8695_PCI_VA + KS8695_PIOBAC);
/* hook in fault handlers */
hook_fault_code(8, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
hook_fault_code(10, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
}
static void ks8695_show_pciregs(void)
{
if (!pci_dbg)
return;
printk(KERN_INFO "PCI: CRCFID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFID));
printk(KERN_INFO "PCI: CRCFCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS));
printk(KERN_INFO "PCI: CRCFRV = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFRV));
printk(KERN_INFO "PCI: CRCFLT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFLT));
printk(KERN_INFO "PCI: CRCBMA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCBMA));
printk(KERN_INFO "PCI: CRCSID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCSID));
printk(KERN_INFO "PCI: CRCFIT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFIT));
printk(KERN_INFO "PCI: PBM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBM));
printk(KERN_INFO "PCI: PBCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBCS));
printk(KERN_INFO "PCI: PMBA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBA));
printk(KERN_INFO "PCI: PMBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAC));
printk(KERN_INFO "PCI: PMBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAM));
printk(KERN_INFO "PCI: PMBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAT));
printk(KERN_INFO "PCI: PIOBA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBA));
printk(KERN_INFO "PCI: PIOBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAC));
printk(KERN_INFO "PCI: PIOBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAM));
printk(KERN_INFO "PCI: PIOBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAT));
}
static struct hw_pci ks8695_pci __initdata = {
.nr_controllers = 1,
.ops = &ks8695_pci_ops,
.preinit = ks8695_pci_preinit,
.setup = ks8695_pci_setup,
.postinit = NULL,
.map_irq = NULL,
};
void __init ks8695_init_pci(struct ks8695_pci_cfg *cfg)
{
if (__raw_readl(KS8695_PCI_VA + KS8695_CRCFRV) & CFRV_GUEST) {
printk("PCI: KS8695 in guest mode, not initialising\n");
return;
}
pcibios_min_io = 0;
pcibios_min_mem = 0;
printk(KERN_INFO "PCI: Initialising\n");
ks8695_show_pciregs();
/* set Mode */
__raw_writel(cfg->mode << 29, KS8695_PCI_VA + KS8695_PBM);
ks8695_pci.map_irq = cfg->map_irq; /* board-specific map_irq method */
pci_common_init(&ks8695_pci);
}
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