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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-iop3xx/iop331-pci.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-iop3xx/iop331-pci.c')
-rw-r--r--arch/arm/mach-iop3xx/iop331-pci.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/arch/arm/mach-iop3xx/iop331-pci.c b/arch/arm/mach-iop3xx/iop331-pci.c
new file mode 100644
index 00000000000..44dd213b48a
--- /dev/null
+++ b/arch/arm/mach-iop3xx/iop331-pci.c
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+/*
+ * arch/arm/mach-iop3xx/iop331-pci.c
+ *
+ * PCI support for the Intel IOP331 chipset
+ *
+ * Author: Dave Jiang (dave.jiang@intel.com)
+ * Copyright (C) 2003, 2004 Intel Corp.
+ *
+ * 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/slab.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/hardware.h>
+#include <asm/mach/pci.h>
+
+#include <asm/arch/iop331.h>
+
+#undef DEBUG
+#undef DEBUG1
+
+#ifdef DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...) do { } while (0)
+#endif
+
+#ifdef DEBUG1
+#define DBG1(x...) printk(x)
+#else
+#define DBG1(x...) do { } while (0)
+#endif
+
+/*
+ * This routine builds either a type0 or type1 configuration command. If the
+ * bus is on the 80331 then a type0 made, else a type1 is created.
+ */
+static u32 iop331_cfg_address(struct pci_bus *bus, int devfn, int where)
+{
+ struct pci_sys_data *sys = bus->sysdata;
+ u32 addr;
+
+ if (sys->busnr == bus->number)
+ addr = 1 << (PCI_SLOT(devfn) + 16) | (PCI_SLOT(devfn) << 11);
+ else
+ addr = bus->number << 16 | PCI_SLOT(devfn) << 11 | 1;
+
+ addr |= PCI_FUNC(devfn) << 8 | (where & ~3);
+
+ return addr;
+}
+
+/*
+ * This routine checks the status of the last configuration cycle. If an error
+ * was detected it returns a 1, else it returns a 0. The errors being checked
+ * are parity, master abort, target abort (master and target). These types of
+ * errors occure during a config cycle where there is no device, like during
+ * the discovery stage.
+ */
+static int iop331_pci_status(void)
+{
+ unsigned int status;
+ int ret = 0;
+
+ /*
+ * Check the status registers.
+ */
+ status = *IOP331_ATUSR;
+ if (status & 0xf900)
+ {
+ DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
+ *IOP331_ATUSR = status & 0xf900;
+ ret = 1;
+ }
+ status = *IOP331_ATUISR;
+ if (status & 0x679f)
+ {
+ DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
+ *IOP331_ATUISR = status & 0x679f;
+ ret = 1;
+ }
+ return ret;
+}
+
+/*
+ * Simply write the address register and read the configuration
+ * data. Note that the 4 nop's ensure that we are able to handle
+ * a delayed abort (in theory.)
+ */
+static inline u32 iop331_read(unsigned long addr)
+{
+ u32 val;
+
+ __asm__ __volatile__(
+ "str %1, [%2]\n\t"
+ "ldr %0, [%3]\n\t"
+ "nop\n\t"
+ "nop\n\t"
+ "nop\n\t"
+ "nop\n\t"
+ : "=r" (val)
+ : "r" (addr), "r" (IOP331_OCCAR), "r" (IOP331_OCCDR));
+
+ return val;
+}
+
+/*
+ * The read routines must check the error status of the last configuration
+ * cycle. If there was an error, the routine returns all hex f's.
+ */
+static int
+iop331_read_config(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 *value)
+{
+ unsigned long addr = iop331_cfg_address(bus, devfn, where);
+ u32 val = iop331_read(addr) >> ((where & 3) * 8);
+
+ if( iop331_pci_status() )
+ val = 0xffffffff;
+
+ *value = val;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+iop331_write_config(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 value)
+{
+ unsigned long addr = iop331_cfg_address(bus, devfn, where);
+ u32 val;
+
+ if (size != 4) {
+ val = iop331_read(addr);
+ if (!iop331_pci_status() == 0)
+ return PCIBIOS_SUCCESSFUL;
+
+ where = (where & 3) * 8;
+
+ if (size == 1)
+ val &= ~(0xff << where);
+ else
+ val &= ~(0xffff << where);
+
+ *IOP331_OCCDR = val | value << where;
+ } else {
+ asm volatile(
+ "str %1, [%2]\n\t"
+ "str %0, [%3]\n\t"
+ "nop\n\t"
+ "nop\n\t"
+ "nop\n\t"
+ "nop\n\t"
+ :
+ : "r" (value), "r" (addr),
+ "r" (IOP331_OCCAR), "r" (IOP331_OCCDR));
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops iop331_ops = {
+ .read = iop331_read_config,
+ .write = iop331_write_config,
+};
+
+/*
+ * When a PCI device does not exist during config cycles, the XScale gets a
+ * bus error instead of returning 0xffffffff. This handler simply returns.
+ */
+int
+iop331_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
+{
+ DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n",
+ addr, fsr, regs->ARM_pc, regs->ARM_lr);
+
+ /*
+ * If it was an imprecise abort, then we need to correct the
+ * return address to be _after_ the instruction.
+ */
+ if (fsr & (1 << 10))
+ regs->ARM_pc += 4;
+
+ return 0;
+}
+
+/*
+ * Scan an IOP331 PCI bus. sys->bus defines which bus we scan.
+ */
+struct pci_bus *iop331_scan_bus(int nr, struct pci_sys_data *sys)
+{
+ return pci_scan_bus(sys->busnr, &iop331_ops, sys);
+}
+
+void iop331_init(void)
+{
+ DBG1("PCI: Intel 80331 PCI init code.\n");
+ DBG1("\tATU: IOP331_ATUCMD=0x%04x\n", *IOP331_ATUCMD);
+ DBG1("\tATU: IOP331_OMWTVR0=0x%04x, IOP331_OIOWTVR=0x%04x\n",
+ *IOP331_OMWTVR0,
+ *IOP331_OIOWTVR);
+ DBG1("\tATU: IOP331_OMWTVR1=0x%04x\n", *IOP331_OMWTVR1);
+ DBG1("\tATU: IOP331_ATUCR=0x%08x\n", *IOP331_ATUCR);
+ DBG1("\tATU: IOP331_IABAR0=0x%08x IOP331_IALR0=0x%08x IOP331_IATVR0=%08x\n", *IOP331_IABAR0, *IOP331_IALR0, *IOP331_IATVR0);
+ DBG1("\tATU: IOP31_IABAR1=0x%08x IOP331_IALR1=0x%08x\n", *IOP331_IABAR1, *IOP331_IALR1);
+ DBG1("\tATU: IOP331_ERBAR=0x%08x IOP331_ERLR=0x%08x IOP331_ERTVR=%08x\n", *IOP331_ERBAR, *IOP331_ERLR, *IOP331_ERTVR);
+ DBG1("\tATU: IOP331_IABAR2=0x%08x IOP331_IALR2=0x%08x IOP331_IATVR2=%08x\n", *IOP331_IABAR2, *IOP331_IALR2, *IOP331_IATVR2);
+ DBG1("\tATU: IOP331_IABAR3=0x%08x IOP331_IALR3=0x%08x IOP331_IATVR3=%08x\n", *IOP331_IABAR3, *IOP331_IALR3, *IOP331_IATVR3);
+
+ hook_fault_code(16+6, iop331_pci_abort, SIGBUS, "imprecise external abort");
+}
+