MIPS: Lemote 2F: Add PCI support

PCI support for the Fuloong 2E and Lemote Loongson 2F family machines is
mostly identical with the exception of CS5536 support.

Rename ops-fuloong2e.c to ops-loongson2.c then add the CS5536 support to
share most of the source code among Loongson machines.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: zhangfx@lemote.com
Cc: yanh@lemote.com 
Cc: huhb@lemote.com
Cc: Nicholas Mc Guire <hofrat@hofr.at>
Cc: Arnaud Patard <apatard@mandriva.com>
Cc: loongson-dev@googlegroups.com
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 208 insertions, 0 deletions

diff --git a/arch/mips/pci/ops-loongson2.c b/arch/mips/pci/ops-loongson2.c
new file mode 100644
index 000000000000..aa5d3da27212
--- /dev/null
+++ b/arch/mips/pci/ops-loongson2.c
@@ -0,0 +1,208 @@
+/*
+ * fuloong2e specific PCI support.
+ *
+ * Copyright (C) 1999, 2000, 2004  MIPS Technologies, Inc.
+ *      All rights reserved.
+ *      Authors: Carsten Langgaard <carstenl@mips.com>
+ *               Maciej W. Rozycki <macro@mips.com>
+ *
+ * Copyright (C) 2009 Lemote Inc.
+ * Author: Wu Zhangjin <wuzj@lemote.com>
+ *
+ *  This program is free software; you can distribute 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/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <loongson.h>
+
+#ifdef CONFIG_CS5536
+#include <cs5536/cs5536_pci.h>
+#include <cs5536/cs5536.h>
+#endif
+
+#define PCI_ACCESS_READ  0
+#define PCI_ACCESS_WRITE 1
+
+#define CFG_SPACE_REG(offset) \
+        (void *)CKSEG1ADDR(LOONGSON_PCICFG_BASE | (offset))
+#define ID_SEL_BEGIN 11
+#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
+
+
+static int loongson_pcibios_config_access(unsigned char access_type,
+                                      struct pci_bus *bus,
+                                      unsigned int devfn, int where,
+                                      u32 *data)
+{
+        u32 busnum = bus->number;
+        u32 addr, type;
+        u32 dummy;
+        void *addrp;
+        int device = PCI_SLOT(devfn);
+        int function = PCI_FUNC(devfn);
+        int reg = where & ~3;
+
+        if (busnum == 0) {
+                /* board-specific part,currently,only fuloong2f,yeeloong2f
+                 * use CS5536, fuloong2e use via686b, gdium has no
+                 * south bridge
+                 */
+#ifdef CONFIG_CS5536
+                /* cs5536_pci_conf_read4/write4() will call _rdmsr/_wrmsr() to
+                 * access the regsters PCI_MSR_ADDR, PCI_MSR_DATA_LO,
+                 * PCI_MSR_DATA_HI, which is bigger than PCI_MSR_CTRL, so, it
+                 * will not go this branch, but the others. so, no calling dead
+                 * loop here.
+                 */
+                if ((PCI_IDSEL_CS5536 == device) && (reg < PCI_MSR_CTRL)) {
+                        switch (access_type) {
+                        case PCI_ACCESS_READ:
+                                *data = cs5536_pci_conf_read4(function, reg);
+                                break;
+                        case PCI_ACCESS_WRITE:
+                                cs5536_pci_conf_write4(function, reg, *data);
+                                break;
+                        }
+                        return 0;
+                }
+#endif
+                /* Type 0 configuration for onboard PCI bus */
+                if (device > MAX_DEV_NUM)
+                        return -1;
+
+                addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
+                type = 0;
+        } else {
+                /* Type 1 configuration for offboard PCI bus */
+                addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
+                type = 0x10000;
+        }
+
+        /* Clear aborts */
+        LOONGSON_PCICMD |= LOONGSON_PCICMD_MABORT_CLR | \
+                                LOONGSON_PCICMD_MTABORT_CLR;
+
+        LOONGSON_PCIMAP_CFG = (addr >> 16) | type;
+
+        /* Flush Bonito register block */
+        dummy = LOONGSON_PCIMAP_CFG;
+        mmiowb();
+
+        addrp = CFG_SPACE_REG(addr & 0xffff);
+        if (access_type == PCI_ACCESS_WRITE)
+                writel(cpu_to_le32(*data), addrp);
+        else
+                *data = le32_to_cpu(readl(addrp));
+
+        /* Detect Master/Target abort */
+        if (LOONGSON_PCICMD & (LOONGSON_PCICMD_MABORT_CLR |
+                             LOONGSON_PCICMD_MTABORT_CLR)) {
+                /* Error occurred */
+
+                /* Clear bits */
+                LOONGSON_PCICMD |= (LOONGSON_PCICMD_MABORT_CLR |
+                                  LOONGSON_PCICMD_MTABORT_CLR);
+
+                return -1;
+        }
+
+        return 0;
+
+}
+
+
+/*
+ * We can't address 8 and 16 bit words directly.  Instead we have to
+ * read/write a 32bit word and mask/modify the data we actually want.
+ */
+static int loongson_pcibios_read(struct pci_bus *bus, unsigned int devfn,
+                             int where, int size, u32 *val)
+{
+        u32 data = 0;
+
+        if ((size == 2) && (where & 1))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+        else if ((size == 4) && (where & 3))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
+                                       &data))
+                return -1;
+
+        if (size == 1)
+                *val = (data >> ((where & 3) << 3)) & 0xff;
+        else if (size == 2)
+                *val = (data >> ((where & 3) << 3)) & 0xffff;
+        else
+                *val = data;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int loongson_pcibios_write(struct pci_bus *bus, unsigned int devfn,
+                              int where, int size, u32 val)
+{
+        u32 data = 0;
+
+        if ((size == 2) && (where & 1))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+        else if ((size == 4) && (where & 3))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        if (size == 4)
+                data = val;
+        else {
+                if (loongson_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
+                                        where, &data))
+                        return -1;
+
+                if (size == 1)
+                        data = (data & ~(0xff << ((where & 3) << 3))) |
+                                (val << ((where & 3) << 3));
+                else if (size == 2)
+                        data = (data & ~(0xffff << ((where & 3) << 3))) |
+                                (val << ((where & 3) << 3));
+        }
+
+        if (loongson_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
+                                       &data))
+                return -1;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops loongson_pci_ops = {
+        .read = loongson_pcibios_read,
+        .write = loongson_pcibios_write
+};
+
+#ifdef CONFIG_CS5536
+void _rdmsr(u32 msr, u32 *hi, u32 *lo)
+{
+        struct pci_bus bus = {
+                .number = PCI_BUS_CS5536
+        };
+        u32 devfn = PCI_DEVFN(PCI_IDSEL_CS5536, 0);
+        loongson_pcibios_write(&bus, devfn, PCI_MSR_ADDR, 4, msr);
+        loongson_pcibios_read(&bus, devfn, PCI_MSR_DATA_LO, 4, lo);
+        loongson_pcibios_read(&bus, devfn, PCI_MSR_DATA_HI, 4, hi);
+}
+EXPORT_SYMBOL(_rdmsr);
+
+void _wrmsr(u32 msr, u32 hi, u32 lo)
+{
+        struct pci_bus bus = {
+                .number = PCI_BUS_CS5536
+        };
+        u32 devfn = PCI_DEVFN(PCI_IDSEL_CS5536, 0);
+        loongson_pcibios_write(&bus, devfn, PCI_MSR_ADDR, 4, msr);
+        loongson_pcibios_write(&bus, devfn, PCI_MSR_DATA_LO, 4, lo);
+        loongson_pcibios_write(&bus, devfn, PCI_MSR_DATA_HI, 4, hi);
+}
+EXPORT_SYMBOL(_wrmsr);
+#endif