sh: Consolidated SH7751/SH7780 PCI support.

This cleans up quite a lot of the PCI mess that we
currently have, and attempts to consolidate the
duplication in the SH7780 and SH7751 PCI controllers.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 164 insertions, 0 deletions

diff --git a/arch/sh/drivers/pci/ops-sh4.c b/arch/sh/drivers/pci/ops-sh4.c
new file mode 100644
index 000000000000..2d4371009a5e
--- /dev/null
+++ b/arch/sh/drivers/pci/ops-sh4.c
@@ -0,0 +1,164 @@
+/*
+ * Generic SH-4 / SH-4A PCIC operations (SH7751, SH7780).
+ *
+ * Copyright (C) 2002 - 2006  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License v2. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/pci.h>
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include "pci-sh4.h"
+
+/*
+ * Direct access to PCI hardware...
+ */
+#define CONFIG_CMD(bus, devfn, where) \
+        P1SEGADDR((bus->number << 16) | (devfn << 8) | (where & ~3))
+
+static DEFINE_SPINLOCK(sh4_pci_lock);
+
+/*
+ * Functions for accessing PCI configuration space with type 1 accesses
+ */
+static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
+                           int where, int size, u32 *val)
+{
+        unsigned long flags;
+        u32 data;
+
+        /*
+         * PCIPDR may only be accessed as 32 bit words,
+         * so we must do byte alignment by hand
+         */
+        spin_lock_irqsave(&sh4_pci_lock, flags);
+        pci_write_reg(CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
+        data = pci_read_reg(SH4_PCIPDR);
+        spin_unlock_irqrestore(&sh4_pci_lock, flags);
+
+        switch (size) {
+        case 1:
+                *val = (data >> ((where & 3) << 3)) & 0xff;
+                break;
+        case 2:
+                *val = (data >> ((where & 2) << 3)) & 0xffff;
+                break;
+        case 4:
+                *val = data;
+                break;
+        default:
+                return PCIBIOS_FUNC_NOT_SUPPORTED;
+        }
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+/*
+ * Since SH4 only does 32bit access we'll have to do a read,
+ * mask,write operation.
+ * We'll allow an odd byte offset, though it should be illegal.
+ */
+static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
+                         int where, int size, u32 val)
+{
+        unsigned long flags;
+        int shift;
+        u32 data;
+
+        spin_lock_irqsave(&sh4_pci_lock, flags);
+        pci_write_reg(CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
+        data = pci_read_reg(SH4_PCIPDR);
+        spin_unlock_irqrestore(&sh4_pci_lock, flags);
+
+        switch (size) {
+        case 1:
+                shift = (where & 3) << 3;
+                data &= ~(0xff << shift);
+                data |= ((val & 0xff) << shift);
+                break;
+        case 2:
+                shift = (where & 2) << 3;
+                data &= ~(0xffff << shift);
+                data |= ((val & 0xffff) << shift);
+                break;
+        case 4:
+                data = val;
+                break;
+        default:
+                return PCIBIOS_FUNC_NOT_SUPPORTED;
+        }
+
+        pci_write_reg(data, SH4_PCIPDR);
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops sh4_pci_ops = {
+        .read           = sh4_pci_read,
+        .write          = sh4_pci_write,
+};
+
+/*
+ * Not really related to pci_ops, but it's common and not worth shoving
+ * somewhere else for now..
+ */
+static unsigned int pci_probe = PCI_PROBE_CONF1;
+
+int __init sh4_pci_check_direct(void)
+{
+        /*
+         * Check if configuration works.
+         */
+        if (pci_probe & PCI_PROBE_CONF1) {
+                unsigned int tmp = pci_read_reg(SH4_PCIPAR);
+
+                pci_write_reg(P1SEG, SH4_PCIPAR);
+
+                if (pci_read_reg(SH4_PCIPAR) == P1SEG) {
+                        pci_write_reg(tmp, SH4_PCIPAR);
+                        printk(KERN_INFO "PCI: Using configuration type 1\n");
+                        request_region(PCI_REG(SH4_PCIPAR), 8, "PCI conf1");
+
+                        return 0;
+                }
+
+                pci_write_reg(tmp, SH4_PCIPAR);
+        }
+
+        pr_debug("PCI: pci_check_direct failed\n");
+        return -EINVAL;
+}
+
+/* Handle generic fixups */
+static void __init pci_fixup_ide_bases(struct pci_dev *d)
+{
+        int i;
+
+        /*
+         * PCI IDE controllers use non-standard I/O port decoding, respect it.
+         */
+        if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
+                return;
+        pr_debug("PCI: IDE base address fixup for %s\n", pci_name(d));
+        for(i = 0; i < 4; i++) {
+                struct resource *r = &d->resource[i];
+
+                if ((r->start & ~0x80) == 0x374) {
+                        r->start |= 2;
+                        r->end = r->start;
+                }
+        }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
+
+char * __init pcibios_setup(char *str)
+{
+        if (!strcmp(str, "off")) {
+                pci_probe = 0;
+                return NULL;
+        }
+
+        return str;
+}