[PATCH] ARM: 2693/1: Add PCI support for Versatile/PB
Patch from Catalin Marinas
This patch adds PCI support for the Versatile PB926 platform.
Signed-off-by: Colin King
Signed-off-by: Catalin Marinas
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-versatile/pci.c b/arch/arm/mach-versatile/pci.c
new file mode 100644
index 0000000..d1565e8
--- /dev/null
+++ b/arch/arm/mach-versatile/pci.c
@@ -0,0 +1,360 @@
+/*
+ * linux/arch/arm/mach-versatile/pci.c
+ *
+ * (C) Copyright Koninklijke Philips Electronics NV 2004. All rights reserved.
+ * You can redistribute and/or modify this software under the terms of version 2
+ * of the GNU General Public License as published by the Free Software Foundation.
+ * THIS SOFTWARE IS PROVIDED "AS IS" 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.
+ * Koninklijke Philips Electronics nor its subsidiaries is obligated to provide any support for this software.
+ *
+ * ARM Versatile PCI driver.
+ *
+ * 14/04/2005 Initial version, colin.king@philips.com
+ *
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/mach/pci.h>
+#include <asm/mach-types.h>
+
+/*
+ * these spaces are mapped using the following base registers:
+ *
+ * Usage Local Bus Memory Base/Map registers used
+ *
+ * Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0, non prefetch
+ * Mem 60000000 - 6FFFFFFF LB_BASE1/LB_MAP1, prefetch
+ * IO 44000000 - 4FFFFFFF LB_BASE2/LB_MAP2, IO
+ * Cfg 42000000 - 42FFFFFF PCI config
+ *
+ */
+#define SYS_PCICTL IO_ADDRESS(VERSATILE_SYS_PCICTL)
+#define PCI_IMAP0 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x0)
+#define PCI_IMAP1 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x4)
+#define PCI_IMAP2 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x8)
+#define PCI_SMAP0 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x10)
+#define PCI_SMAP1 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x14)
+#define PCI_SMAP2 IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x18)
+#define PCI_SELFID IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0xc)
+
+#define DEVICE_ID_OFFSET 0x00
+#define CSR_OFFSET 0x04
+#define CLASS_ID_OFFSET 0x08
+
+#define VP_PCI_DEVICE_ID 0x030010ee
+#define VP_PCI_CLASS_ID 0x0b400000
+
+static unsigned long pci_slot_ignore = 0;
+
+static int __init versatile_pci_slot_ignore(char *str)
+{
+ int retval;
+ int slot;
+
+ while ((retval = get_option(&str,&slot))) {
+ if ((slot < 0) || (slot > 31)) {
+ printk("Illegal slot value: %d\n",slot);
+ } else {
+ pci_slot_ignore |= (1 << slot);
+ }
+ }
+ return 1;
+}
+
+__setup("pci_slot_ignore=", versatile_pci_slot_ignore);
+
+
+static unsigned long __pci_addr(struct pci_bus *bus,
+ unsigned int devfn, int offset)
+{
+ unsigned int busnr = bus->number;
+
+ /*
+ * Trap out illegal values
+ */
+ if (offset > 255)
+ BUG();
+ if (busnr > 255)
+ BUG();
+ if (devfn > 255)
+ BUG();
+
+ return (VERSATILE_PCI_CFG_VIRT_BASE | (busnr << 16) |
+ (PCI_SLOT(devfn) << 11) | (PCI_FUNC(devfn) << 8) | offset);
+}
+
+static int versatile_read_config(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 *val)
+{
+ unsigned long addr = __pci_addr(bus, devfn, where);
+ u32 v;
+ int slot = PCI_SLOT(devfn);
+
+ if (pci_slot_ignore & (1 << slot)) {
+ /* Ignore this slot */
+ switch (size) {
+ case 1:
+ v = 0xff;
+ break;
+ case 2:
+ v = 0xffff;
+ break;
+ default:
+ v = 0xffffffff;
+ }
+ } else {
+ switch (size) {
+ case 1:
+ addr &= ~3;
+ v = __raw_readb(addr);
+ break;
+
+ case 2:
+ v = __raw_readl(addr & ~3);
+ if (addr & 2) v >>= 16;
+ v &= 0xffff;
+ break;
+
+ default:
+ addr &= ~3;
+ v = __raw_readl(addr);
+ break;
+ }
+ }
+
+ *val = v;
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int versatile_write_config(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 val)
+{
+ unsigned long addr = __pci_addr(bus, devfn, where);
+ int slot = PCI_SLOT(devfn);
+
+ if (pci_slot_ignore & (1 << slot)) {
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ switch (size) {
+ case 1:
+ __raw_writeb((u8)val, addr);
+ break;
+
+ case 2:
+ __raw_writew((u16)val, addr);
+ break;
+
+ case 4:
+ __raw_writel(val, addr);
+ break;
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops pci_versatile_ops = {
+ .read = versatile_read_config,
+ .write = versatile_write_config,
+};
+
+static struct resource io_mem = {
+ .name = "PCI I/O space",
+ .start = VERSATILE_PCI_MEM_BASE0,
+ .end = VERSATILE_PCI_MEM_BASE0+VERSATILE_PCI_MEM_BASE0_SIZE-1,
+ .flags = IORESOURCE_IO,
+};
+
+static struct resource non_mem = {
+ .name = "PCI non-prefetchable",
+ .start = VERSATILE_PCI_MEM_BASE1,
+ .end = VERSATILE_PCI_MEM_BASE1+VERSATILE_PCI_MEM_BASE1_SIZE-1,
+ .flags = IORESOURCE_MEM,
+};
+
+static struct resource pre_mem = {
+ .name = "PCI prefetchable",
+ .start = VERSATILE_PCI_MEM_BASE2,
+ .end = VERSATILE_PCI_MEM_BASE2+VERSATILE_PCI_MEM_BASE2_SIZE-1,
+ .flags = IORESOURCE_MEM | IORESOURCE_PREFETCH,
+};
+
+static int __init pci_versatile_setup_resources(struct resource **resource)
+{
+ int ret = 0;
+
+ ret = request_resource(&iomem_resource, &io_mem);
+ if (ret) {
+ printk(KERN_ERR "PCI: unable to allocate I/O "
+ "memory region (%d)\n", ret);
+ goto out;
+ }
+ ret = request_resource(&iomem_resource, &non_mem);
+ if (ret) {
+ printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
+ "memory region (%d)\n", ret);
+ goto release_io_mem;
+ }
+ ret = request_resource(&iomem_resource, &pre_mem);
+ if (ret) {
+ printk(KERN_ERR "PCI: unable to allocate prefetchable "
+ "memory region (%d)\n", ret);
+ goto release_non_mem;
+ }
+
+ /*
+ * bus->resource[0] is the IO resource for this bus
+ * bus->resource[1] is the mem resource for this bus
+ * bus->resource[2] is the prefetch mem resource for this bus
+ */
+ resource[0] = &io_mem;
+ resource[1] = &non_mem;
+ resource[2] = &pre_mem;
+
+ goto out;
+
+ release_non_mem:
+ release_resource(&non_mem);
+ release_io_mem:
+ release_resource(&io_mem);
+ out:
+ return ret;
+}
+
+int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
+{
+ int ret = 0;
+ int i;
+ int myslot = -1;
+ unsigned long val;
+
+ if (nr == 0) {
+ sys->mem_offset = 0;
+ ret = pci_versatile_setup_resources(sys->resource);
+ if (ret < 0) {
+ printk("pci_versatile_setup: resources... oops?\n");
+ goto out;
+ }
+ } else {
+ printk("pci_versatile_setup: resources... nr == 0??\n");
+ goto out;
+ }
+
+ __raw_writel(VERSATILE_PCI_MEM_BASE0 >> 28,PCI_IMAP0);
+ __raw_writel(VERSATILE_PCI_MEM_BASE1 >> 28,PCI_IMAP1);
+ __raw_writel(VERSATILE_PCI_MEM_BASE2 >> 28,PCI_IMAP2);
+
+ __raw_writel(1, SYS_PCICTL);
+
+ val = __raw_readl(SYS_PCICTL);
+ if (!(val & 1)) {
+ printk("Not plugged into PCI backplane!\n");
+ ret = -EIO;
+ goto out;
+ }
+
+ /*
+ * We need to discover the PCI core first to configure itself
+ * before the main PCI probing is performed
+ */
+ for (i=0; i<32; i++) {
+ if ((__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+DEVICE_ID_OFFSET) == VP_PCI_DEVICE_ID) &&
+ (__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+CLASS_ID_OFFSET) == VP_PCI_CLASS_ID)) {
+ myslot = i;
+
+ __raw_writel(myslot, PCI_SELFID);
+ val = __raw_readl(VERSATILE_PCI_CFG_VIRT_BASE+(myslot<<11)+CSR_OFFSET);
+ val |= (1<<2);
+ __raw_writel(val, VERSATILE_PCI_CFG_VIRT_BASE+(myslot<<11)+CSR_OFFSET);
+ break;
+ }
+ }
+
+ if (myslot == -1) {
+ printk("Cannot find PCI core!\n");
+ ret = -EIO;
+ } else {
+ printk("PCI core found (slot %d)\n",myslot);
+ /* Do not to map Versatile FPGA PCI device
+ into memory space as we are short of
+ mappable memory */
+ pci_slot_ignore |= (1 << myslot);
+ ret = 1;
+ }
+
+ out:
+ return ret;
+}
+
+
+struct pci_bus *pci_versatile_scan_bus(int nr, struct pci_sys_data *sys)
+{
+ return pci_scan_bus(sys->busnr, &pci_versatile_ops, sys);
+}
+
+/*
+ * V3_LB_BASE? - local bus address
+ * V3_LB_MAP? - pci bus address
+ */
+void __init pci_versatile_preinit(void)
+{
+}
+
+void __init pci_versatile_postinit(void)
+{
+}
+
+
+/*
+ * map the specified device/slot/pin to an IRQ. Different backplanes may need to modify this.
+ */
+static int __init versatile_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ int irq;
+ int devslot = PCI_SLOT(dev->devfn);
+
+ /* slot, pin, irq
+ 24 1 27
+ 25 1 28 untested
+ 26 1 29
+ 27 1 30 untested
+ */
+
+ irq = 27 + ((slot + pin + 2) % 3); /* Fudged */
+
+ printk("map irq: slot %d, pin %d, devslot %d, irq: %d\n",slot,pin,devslot,irq);
+
+ return irq;
+}
+
+static struct hw_pci versatile_pci __initdata = {
+ .swizzle = NULL,
+ .map_irq = versatile_map_irq,
+ .nr_controllers = 1,
+ .setup = pci_versatile_setup,
+ .scan = pci_versatile_scan_bus,
+ .preinit = pci_versatile_preinit,
+ .postinit = pci_versatile_postinit,
+};
+
+static int __init versatile_pci_init(void)
+{
+ pci_common_init(&versatile_pci);
+ return 0;
+}
+
+subsys_initcall(versatile_pci_init);