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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/mach-footbridge/dc21285.c
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/mach-footbridge/dc21285.c')
-rw-r--r--arch/arm/mach-footbridge/dc21285.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/arch/arm/mach-footbridge/dc21285.c b/arch/arm/mach-footbridge/dc21285.c
new file mode 100644
index 00000000000..e79884eea1f
--- /dev/null
+++ b/arch/arm/mach-footbridge/dc21285.c
@@ -0,0 +1,384 @@
+/*
+ * linux/arch/arm/kernel/dec21285.c: PCI functions for DC21285
+ *
+ * Copyright (C) 1998-2001 Russell King
+ * Copyright (C) 1998-2000 Phil Blundell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/ptrace.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/mach/pci.h>
+#include <asm/hardware/dec21285.h>
+
+#define MAX_SLOTS 21
+
+#define PCICMD_ABORT ((PCI_STATUS_REC_MASTER_ABORT| \
+ PCI_STATUS_REC_TARGET_ABORT)<<16)
+
+#define PCICMD_ERROR_BITS ((PCI_STATUS_DETECTED_PARITY | \
+ PCI_STATUS_REC_MASTER_ABORT | \
+ PCI_STATUS_REC_TARGET_ABORT | \
+ PCI_STATUS_PARITY) << 16)
+
+extern int setup_arm_irq(int, struct irqaction *);
+extern void pcibios_report_status(u_int status_mask, int warn);
+extern void register_isa_ports(unsigned int, unsigned int, unsigned int);
+
+static unsigned long
+dc21285_base_address(struct pci_bus *bus, unsigned int devfn)
+{
+ unsigned long addr = 0;
+
+ if (bus->number == 0) {
+ if (PCI_SLOT(devfn) == 0)
+ /*
+ * For devfn 0, point at the 21285
+ */
+ addr = ARMCSR_BASE;
+ else {
+ devfn -= 1 << 3;
+
+ if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
+ addr = PCICFG0_BASE | 0xc00000 | (devfn << 8);
+ }
+ } else
+ addr = PCICFG1_BASE | (bus->number << 16) | (devfn << 8);
+
+ return addr;
+}
+
+static int
+dc21285_read_config(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 *value)
+{
+ unsigned long addr = dc21285_base_address(bus, devfn);
+ u32 v = 0xffffffff;
+
+ if (addr)
+ switch (size) {
+ case 1:
+ asm("ldr%?b %0, [%1, %2]"
+ : "=r" (v) : "r" (addr), "r" (where));
+ break;
+ case 2:
+ asm("ldr%?h %0, [%1, %2]"
+ : "=r" (v) : "r" (addr), "r" (where));
+ break;
+ case 4:
+ asm("ldr%? %0, [%1, %2]"
+ : "=r" (v) : "r" (addr), "r" (where));
+ break;
+ }
+
+ *value = v;
+
+ v = *CSR_PCICMD;
+ if (v & PCICMD_ABORT) {
+ *CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
+ return -1;
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+dc21285_write_config(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 value)
+{
+ unsigned long addr = dc21285_base_address(bus, devfn);
+ u32 v;
+
+ if (addr)
+ switch (size) {
+ case 1:
+ asm("str%?b %0, [%1, %2]"
+ : : "r" (value), "r" (addr), "r" (where));
+ break;
+ case 2:
+ asm("str%?h %0, [%1, %2]"
+ : : "r" (value), "r" (addr), "r" (where));
+ break;
+ case 4:
+ asm("str%? %0, [%1, %2]"
+ : : "r" (value), "r" (addr), "r" (where));
+ break;
+ }
+
+ v = *CSR_PCICMD;
+ if (v & PCICMD_ABORT) {
+ *CSR_PCICMD = v & (0xffff|PCICMD_ABORT);
+ return -1;
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops dc21285_ops = {
+ .read = dc21285_read_config,
+ .write = dc21285_write_config,
+};
+
+static struct timer_list serr_timer;
+static struct timer_list perr_timer;
+
+static void dc21285_enable_error(unsigned long __data)
+{
+ switch (__data) {
+ case IRQ_PCI_SERR:
+ del_timer(&serr_timer);
+ break;
+
+ case IRQ_PCI_PERR:
+ del_timer(&perr_timer);
+ break;
+ }
+
+ enable_irq(__data);
+}
+
+/*
+ * Warn on PCI errors.
+ */
+static irqreturn_t dc21285_abort_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ unsigned int cmd;
+ unsigned int status;
+
+ cmd = *CSR_PCICMD;
+ status = cmd >> 16;
+ cmd = cmd & 0xffff;
+
+ if (status & PCI_STATUS_REC_MASTER_ABORT) {
+ printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n",
+ instruction_pointer(regs));
+ cmd |= PCI_STATUS_REC_MASTER_ABORT << 16;
+ }
+
+ if (status & PCI_STATUS_REC_TARGET_ABORT) {
+ printk(KERN_DEBUG "PCI: target abort: ");
+ pcibios_report_status(PCI_STATUS_REC_MASTER_ABORT |
+ PCI_STATUS_SIG_TARGET_ABORT |
+ PCI_STATUS_REC_TARGET_ABORT, 1);
+ printk("\n");
+
+ cmd |= PCI_STATUS_REC_TARGET_ABORT << 16;
+ }
+
+ *CSR_PCICMD = cmd;
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t dc21285_serr_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct timer_list *timer = dev_id;
+ unsigned int cntl;
+
+ printk(KERN_DEBUG "PCI: system error received: ");
+ pcibios_report_status(PCI_STATUS_SIG_SYSTEM_ERROR, 1);
+ printk("\n");
+
+ cntl = *CSR_SA110_CNTL & 0xffffdf07;
+ *CSR_SA110_CNTL = cntl | SA110_CNTL_RXSERR;
+
+ /*
+ * back off this interrupt
+ */
+ disable_irq(irq);
+ timer->expires = jiffies + HZ;
+ add_timer(timer);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t dc21285_discard_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ printk(KERN_DEBUG "PCI: discard timer expired\n");
+ *CSR_SA110_CNTL &= 0xffffde07;
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t dc21285_dparity_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ unsigned int cmd;
+
+ printk(KERN_DEBUG "PCI: data parity error detected: ");
+ pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
+ printk("\n");
+
+ cmd = *CSR_PCICMD & 0xffff;
+ *CSR_PCICMD = cmd | 1 << 24;
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t dc21285_parity_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct timer_list *timer = dev_id;
+ unsigned int cmd;
+
+ printk(KERN_DEBUG "PCI: parity error detected: ");
+ pcibios_report_status(PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY, 1);
+ printk("\n");
+
+ cmd = *CSR_PCICMD & 0xffff;
+ *CSR_PCICMD = cmd | 1 << 31;
+
+ /*
+ * back off this interrupt
+ */
+ disable_irq(irq);
+ timer->expires = jiffies + HZ;
+ add_timer(timer);
+
+ return IRQ_HANDLED;
+}
+
+int __init dc21285_setup(int nr, struct pci_sys_data *sys)
+{
+ struct resource *res;
+
+ if (nr || !footbridge_cfn_mode())
+ return 0;
+
+ res = kmalloc(sizeof(struct resource) * 2, GFP_KERNEL);
+ if (!res) {
+ printk("out of memory for root bus resources");
+ return 0;
+ }
+
+ memset(res, 0, sizeof(struct resource) * 2);
+
+ res[0].flags = IORESOURCE_MEM;
+ res[0].name = "Footbridge non-prefetch";
+ res[1].flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
+ res[1].name = "Footbridge prefetch";
+
+ allocate_resource(&iomem_resource, &res[1], 0x20000000,
+ 0xa0000000, 0xffffffff, 0x20000000, NULL, NULL);
+ allocate_resource(&iomem_resource, &res[0], 0x40000000,
+ 0x80000000, 0xffffffff, 0x40000000, NULL, NULL);
+
+ sys->resource[0] = &ioport_resource;
+ sys->resource[1] = &res[0];
+ sys->resource[2] = &res[1];
+ sys->mem_offset = DC21285_PCI_MEM;
+
+ return 1;
+}
+
+struct pci_bus * __init dc21285_scan_bus(int nr, struct pci_sys_data *sys)
+{
+ return pci_scan_bus(0, &dc21285_ops, sys);
+}
+
+void __init dc21285_preinit(void)
+{
+ unsigned int mem_size, mem_mask;
+ int cfn_mode;
+
+ mem_size = (unsigned int)high_memory - PAGE_OFFSET;
+ for (mem_mask = 0x00100000; mem_mask < 0x10000000; mem_mask <<= 1)
+ if (mem_mask >= mem_size)
+ break;
+
+ /*
+ * These registers need to be set up whether we're the
+ * central function or not.
+ */
+ *CSR_SDRAMBASEMASK = (mem_mask - 1) & 0x0ffc0000;
+ *CSR_SDRAMBASEOFFSET = 0;
+ *CSR_ROMBASEMASK = 0x80000000;
+ *CSR_CSRBASEMASK = 0;
+ *CSR_CSRBASEOFFSET = 0;
+ *CSR_PCIADDR_EXTN = 0;
+
+ cfn_mode = __footbridge_cfn_mode();
+
+ printk(KERN_INFO "PCI: DC21285 footbridge, revision %02lX, in "
+ "%s mode\n", *CSR_CLASSREV & 0xff, cfn_mode ?
+ "central function" : "addin");
+
+ if (footbridge_cfn_mode()) {
+ /*
+ * Clear any existing errors - we aren't
+ * interested in historical data...
+ */
+ *CSR_SA110_CNTL = (*CSR_SA110_CNTL & 0xffffde07) |
+ SA110_CNTL_RXSERR;
+ *CSR_PCICMD = (*CSR_PCICMD & 0xffff) | PCICMD_ERROR_BITS;
+ }
+
+ init_timer(&serr_timer);
+ init_timer(&perr_timer);
+
+ serr_timer.data = IRQ_PCI_SERR;
+ serr_timer.function = dc21285_enable_error;
+ perr_timer.data = IRQ_PCI_PERR;
+ perr_timer.function = dc21285_enable_error;
+
+ /*
+ * We don't care if these fail.
+ */
+ request_irq(IRQ_PCI_SERR, dc21285_serr_irq, SA_INTERRUPT,
+ "PCI system error", &serr_timer);
+ request_irq(IRQ_PCI_PERR, dc21285_parity_irq, SA_INTERRUPT,
+ "PCI parity error", &perr_timer);
+ request_irq(IRQ_PCI_ABORT, dc21285_abort_irq, SA_INTERRUPT,
+ "PCI abort", NULL);
+ request_irq(IRQ_DISCARD_TIMER, dc21285_discard_irq, SA_INTERRUPT,
+ "Discard timer", NULL);
+ request_irq(IRQ_PCI_DPERR, dc21285_dparity_irq, SA_INTERRUPT,
+ "PCI data parity", NULL);
+
+ if (cfn_mode) {
+ static struct resource csrio;
+
+ csrio.flags = IORESOURCE_IO;
+ csrio.name = "Footbridge";
+
+ allocate_resource(&ioport_resource, &csrio, 128,
+ 0xff00, 0xffff, 128, NULL, NULL);
+
+ /*
+ * Map our SDRAM at a known address in PCI space, just in case
+ * the firmware had other ideas. Using a nonzero base is
+ * necessary, since some VGA cards forcefully use PCI addresses
+ * in the range 0x000a0000 to 0x000c0000. (eg, S3 cards).
+ */
+ *CSR_PCICSRBASE = 0xf4000000;
+ *CSR_PCICSRIOBASE = csrio.start;
+ *CSR_PCISDRAMBASE = __virt_to_bus(PAGE_OFFSET);
+ *CSR_PCIROMBASE = 0;
+ *CSR_PCICMD = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+ PCI_COMMAND_INVALIDATE | PCICMD_ERROR_BITS;
+ } else if (footbridge_cfn_mode() != 0) {
+ /*
+ * If we are not compiled to accept "add-in" mode, then
+ * we are using a constant virt_to_bus translation which
+ * can not hope to cater for the way the host BIOS has
+ * set up the machine.
+ */
+ panic("PCI: this kernel is compiled for central "
+ "function mode only");
+ }
+}
+
+void __init dc21285_postinit(void)
+{
+ register_isa_ports(DC21285_PCI_MEM, DC21285_PCI_IO, 0);
+}