[ARM] 3820/1: iop3xx: factor out shared pci code

Merge the iop32x PCI code and iop33x PCI code into plat-iop/pci.c.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 247 insertions, 0 deletions

diff --git a/arch/arm/plat-iop/pci.c b/arch/arm/plat-iop/pci.c
new file mode 100644
index 000000000000..e647812654f2
--- /dev/null
+++ b/arch/arm/plat-iop/pci.c
@@ -0,0 +1,247 @@
+/*
+ * arch/arm/plat-iop/pci.c
+ *
+ * PCI support for the Intel IOP32X and IOP33X processors
+ *
+ * Author: Rory Bolt <rorybolt@pacbell.net>
+ * Copyright (C) 2002 Rory Bolt
+ *
+ * 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/hardware/iop3xx.h>
+
+// #define DEBUG
+
+#ifdef DEBUG
+#define  DBG(x...) printk(x)
+#else
+#define  DBG(x...) do { } while (0)
+#endif
+
+/*
+ * This routine builds either a type0 or type1 configuration command.  If the
+ * bus is on the 803xx then a type0 made, else a type1 is created.
+ */
+static u32 iop3xx_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 iop3xx_pci_status(void)
+{
+        unsigned int status;
+        int ret = 0;
+
+        /*
+         * Check the status registers.
+         */
+        status = *IOP3XX_ATUSR;
+        if (status & 0xf900) {
+                DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
+                *IOP3XX_ATUSR = status & 0xf900;
+                ret = 1;
+        }
+
+        status = *IOP3XX_ATUISR;
+        if (status & 0x679f) {
+                DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
+                *IOP3XX_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 iop3xx_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" (IOP3XX_OCCAR), "r" (IOP3XX_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
+iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
+                int size, u32 *value)
+{
+        unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
+        u32 val = iop3xx_read(addr) >> ((where & 3) * 8);
+
+        if (iop3xx_pci_status())
+                val = 0xffffffff;
+
+        *value = val;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
+                int size, u32 value)
+{
+        unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
+        u32 val;
+
+        if (size != 4) {
+                val = iop3xx_read(addr);
+                if (iop3xx_pci_status())
+                        return PCIBIOS_SUCCESSFUL;
+
+                where = (where & 3) * 8;
+
+                if (size == 1)
+                        val &= ~(0xff << where);
+                else
+                        val &= ~(0xffff << where);
+
+                *IOP3XX_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" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
+        }
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops iop3xx_ops = {
+        .read   = iop3xx_read_config,
+        .write  = iop3xx_write_config,
+};
+
+/*
+ * When a PCI device does not exist during config cycles, the 80200 gets a
+ * bus error instead of returning 0xffffffff. This handler simply returns.
+ */
+static int
+iop3xx_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;
+}
+
+int iop3xx_pci_setup(int nr, struct pci_sys_data *sys)
+{
+        struct resource *res;
+
+        if (nr != 0)
+                return 0;
+
+        res = kzalloc(2 * sizeof(struct resource), GFP_KERNEL);
+        if (!res)
+                panic("PCI: unable to alloc resources");
+
+        res[0].start = IOP3XX_PCI_LOWER_IO_VA;
+        res[0].end   = IOP3XX_PCI_LOWER_IO_VA + IOP3XX_PCI_IO_WINDOW_SIZE - 1;
+        res[0].name  = "IOP3XX PCI I/O Space";
+        res[0].flags = IORESOURCE_IO;
+        request_resource(&ioport_resource, &res[0]);
+
+        res[1].start = IOP3XX_PCI_LOWER_MEM_PA;
+        res[1].end   = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1;
+        res[1].name  = "IOP3XX PCI Memory Space";
+        res[1].flags = IORESOURCE_MEM;
+        request_resource(&iomem_resource, &res[1]);
+
+        sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - IOP3XX_PCI_LOWER_MEM_BA;
+        sys->io_offset  = IOP3XX_PCI_LOWER_IO_VA - IOP3XX_PCI_LOWER_IO_BA;
+
+        sys->resource[0] = &res[0];
+        sys->resource[1] = &res[1];
+        sys->resource[2] = NULL;
+
+        return 1;
+}
+
+struct pci_bus *iop3xx_pci_scan_bus(int nr, struct pci_sys_data *sys)
+{
+        return pci_scan_bus(sys->busnr, &iop3xx_ops, sys);
+}
+
+void iop3xx_pci_preinit(void)
+{
+        DBG("PCI:  Intel 803xx PCI init code.\n");
+        DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
+        DBG("ATU: IOP3XX_OMWTVR0=0x%04x, IOP3XX_OIOWTVR=0x%04x\n",
+                        *IOP3XX_OMWTVR0,
+                        *IOP3XX_OIOWTVR);
+        DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR);
+        DBG("ATU: IOP3XX_IABAR0=0x%08x IOP3XX_IALR0=0x%08x IOP3XX_IATVR0=%08x\n",
+                        *IOP3XX_IABAR0, *IOP3XX_IALR0, *IOP3XX_IATVR0);
+        DBG("ATU: IOP3XX_OMWTVR0=0x%08x\n", *IOP3XX_OMWTVR0);
+        DBG("ATU: IOP3XX_IABAR1=0x%08x IOP3XX_IALR1=0x%08x\n",
+                        *IOP3XX_IABAR1, *IOP3XX_IALR1);
+        DBG("ATU: IOP3XX_ERBAR=0x%08x IOP3XX_ERLR=0x%08x IOP3XX_ERTVR=%08x\n",
+                        *IOP3XX_ERBAR, *IOP3XX_ERLR, *IOP3XX_ERTVR);
+        DBG("ATU: IOP3XX_IABAR2=0x%08x IOP3XX_IALR2=0x%08x IOP3XX_IATVR2=%08x\n",
+                        *IOP3XX_IABAR2, *IOP3XX_IALR2, *IOP3XX_IATVR2);
+        DBG("ATU: IOP3XX_IABAR3=0x%08x IOP3XX_IALR3=0x%08x IOP3XX_IATVR3=%08x\n",
+                        *IOP3XX_IABAR3, *IOP3XX_IALR3, *IOP3XX_IATVR3);
+
+        hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
+}