1 files changed, 325 insertions, 0 deletions

diff --git a/arch/mips/pci/ops-au1000.c b/arch/mips/pci/ops-au1000.c
new file mode 100644
index 000000000000..c1c91ca0f9c2
--- /dev/null
+++ b/arch/mips/pci/ops-au1000.c
@@ -0,0 +1,325 @@
+/*
+ * BRIEF MODULE DESCRIPTION
+ *      Alchemy/AMD Au1x00 pci support.
+ *
+ * Copyright 2001,2002,2003 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ *              ppopov@mvista.com or source@mvista.com
+ *
+ *  Support for all devices (greater than 16) added by David Gathright.
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/vmalloc.h>
+
+#include <asm/mach-au1x00/au1000.h>
+
+#undef DEBUG
+#ifdef DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+#define PCI_ACCESS_READ  0
+#define PCI_ACCESS_WRITE 1
+
+
+int (*board_pci_idsel)(unsigned int devsel, int assert);
+
+/* CP0 hazard avoidance. */
+#define BARRIER __asm__ __volatile__(".set noreorder\n\t" \
+                                     "nop; nop; nop; nop;\t" \
+                                     ".set reorder\n\t")
+
+void mod_wired_entry(int entry, unsigned long entrylo0,
+                unsigned long entrylo1, unsigned long entryhi,
+                unsigned long pagemask)
+{
+        unsigned long old_pagemask;
+        unsigned long old_ctx;
+
+        /* Save old context and create impossible VPN2 value */
+        old_ctx = read_c0_entryhi() & 0xff;
+        old_pagemask = read_c0_pagemask();
+        write_c0_index(entry);
+        BARRIER;
+        write_c0_pagemask(pagemask);
+        write_c0_entryhi(entryhi);
+        write_c0_entrylo0(entrylo0);
+        write_c0_entrylo1(entrylo1);
+        BARRIER;
+        tlb_write_indexed();
+        BARRIER;
+        write_c0_entryhi(old_ctx);
+        BARRIER;
+        write_c0_pagemask(old_pagemask);
+}
+
+struct vm_struct *pci_cfg_vm;
+static int pci_cfg_wired_entry;
+static int first_cfg = 1;
+unsigned long last_entryLo0, last_entryLo1;
+
+static int config_access(unsigned char access_type, struct pci_bus *bus,
+                         unsigned int dev_fn, unsigned char where,
+                         u32 * data)
+{
+#if defined( CONFIG_SOC_AU1500 ) || defined( CONFIG_SOC_AU1550 )
+        unsigned int device = PCI_SLOT(dev_fn);
+        unsigned int function = PCI_FUNC(dev_fn);
+        unsigned long offset, status;
+        unsigned long cfg_base;
+        unsigned long flags;
+        int error = PCIBIOS_SUCCESSFUL;
+        unsigned long entryLo0, entryLo1;
+
+        if (device > 19) {
+                *data = 0xffffffff;
+                return -1;
+        }
+
+        local_irq_save(flags);
+        au_writel(((0x2000 << 16) | (au_readl(Au1500_PCI_STATCMD) & 0xffff)),
+                        Au1500_PCI_STATCMD);
+        au_sync_udelay(1);
+
+        /*
+         * We can't ioremap the entire pci config space because it's
+         * too large. Nor can we call ioremap dynamically because some
+         * device drivers use the pci config routines from within
+         * interrupt handlers and that becomes a problem in get_vm_area().
+         * We use one wired tlb to handle all config accesses for all
+         * busses. To improve performance, if the current device
+         * is the same as the last device accessed, we don't touch the
+         * tlb.
+         */
+        if (first_cfg) {
+                /* reserve a wired entry for pci config accesses */
+                first_cfg = 0;
+                pci_cfg_vm = get_vm_area(0x2000, 0);
+                if (!pci_cfg_vm)
+                        panic (KERN_ERR "PCI unable to get vm area\n");
+                pci_cfg_wired_entry = read_c0_wired();
+                add_wired_entry(0, 0, (unsigned long)pci_cfg_vm->addr, PM_4K);
+                last_entryLo0  = last_entryLo1 = 0xffffffff;
+        }
+
+        /* Since the Au1xxx doesn't do the idsel timing exactly to spec,
+         * many board vendors implement their own off-chip idsel, so call
+         * it now.  If it doesn't succeed, may as well bail out at this point.
+         */
+        if (board_pci_idsel) {
+                if (board_pci_idsel(device, 1) == 0) {
+                        *data = 0xffffffff;
+                        local_irq_restore(flags);
+                        return -1;
+                }
+        }
+
+        /* setup the config window */
+        if (bus->number == 0) {
+                cfg_base = ((1<<device)<<11);
+        } else {
+                cfg_base = 0x80000000 | (bus->number<<16) | (device<<11);
+        }
+
+        /* setup the lower bits of the 36 bit address */
+        offset = (function << 8) | (where & ~0x3);
+        /* pick up any address that falls below the page mask */
+        offset |= cfg_base & ~PAGE_MASK;
+
+        /* page boundary */
+        cfg_base = cfg_base & PAGE_MASK;
+
+        entryLo0 = (6 << 26)  | (cfg_base >> 6) | (2 << 3) | 7;
+        entryLo1 = (6 << 26)  | (cfg_base >> 6) | (0x1000 >> 6) | (2 << 3) | 7;
+
+        if ((entryLo0 != last_entryLo0) || (entryLo1 != last_entryLo1)) {
+                mod_wired_entry(pci_cfg_wired_entry, entryLo0, entryLo1,
+                                (unsigned long)pci_cfg_vm->addr, PM_4K);
+                last_entryLo0 = entryLo0;
+                last_entryLo1 = entryLo1;
+        }
+
+        if (access_type == PCI_ACCESS_WRITE) {
+                au_writel(*data, (int)(pci_cfg_vm->addr + offset));
+        } else {
+                *data = au_readl((int)(pci_cfg_vm->addr + offset));
+        }
+        au_sync_udelay(2);
+
+        DBG("cfg_access %d bus->number %d dev %d at %x *data %x conf %x\n",
+                        access_type, bus->number, device, where, *data, offset);
+
+        /* check master abort */
+        status = au_readl(Au1500_PCI_STATCMD);
+
+        if (status & (1<<29)) {
+                *data = 0xffffffff;
+                error = -1;
+                DBG("Au1x Master Abort\n");
+        } else if ((status >> 28) & 0xf) {
+                DBG("PCI ERR detected: status %x\n", status);
+                *data = 0xffffffff;
+                error = -1;
+        }
+
+        /* Take away the idsel.
+        */
+        if (board_pci_idsel) {
+                (void)board_pci_idsel(device, 0);
+        }
+
+        local_irq_restore(flags);
+        return error;
+#endif
+}
+
+static int read_config_byte(struct pci_bus *bus, unsigned int devfn,
+                            int where, u8 * val)
+{
+        u32 data;
+        int ret;
+
+        ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data);
+        if (where & 1)
+                data >>= 8;
+        if (where & 2)
+                data >>= 16;
+        *val = data & 0xff;
+        return ret;
+}
+
+
+static int read_config_word(struct pci_bus *bus, unsigned int devfn,
+                            int where, u16 * val)
+{
+        u32 data;
+        int ret;
+
+        ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data);
+        if (where & 2)
+                data >>= 16;
+        *val = data & 0xffff;
+        return ret;
+}
+
+static int read_config_dword(struct pci_bus *bus, unsigned int devfn,
+                             int where, u32 * val)
+{
+        int ret;
+
+        ret = config_access(PCI_ACCESS_READ, bus, devfn, where, val);
+        return ret;
+}
+
+static int
+write_config_byte(struct pci_bus *bus, unsigned int devfn, int where,
+                  u8 val)
+{
+        u32 data = 0;
+
+        if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
+                return -1;
+
+        data = (data & ~(0xff << ((where & 3) << 3))) |
+            (val << ((where & 3) << 3));
+
+        if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
+                return -1;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+write_config_word(struct pci_bus *bus, unsigned int devfn, int where,
+                  u16 val)
+{
+        u32 data = 0;
+
+        if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
+                return -1;
+
+        data = (data & ~(0xffff << ((where & 3) << 3))) |
+            (val << ((where & 3) << 3));
+
+        if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
+                return -1;
+
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+write_config_dword(struct pci_bus *bus, unsigned int devfn, int where,
+                   u32 val)
+{
+        if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &val))
+                return -1;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int config_read(struct pci_bus *bus, unsigned int devfn,
+                       int where, int size, u32 * val)
+{
+        switch (size) {
+        case 1: {
+                        u8 _val;
+                        int rc = read_config_byte(bus, devfn, where, &_val);
+                        *val = _val;
+                        return rc;
+                }
+       case 2: {
+                        u16 _val;
+                        int rc = read_config_word(bus, devfn, where, &_val);
+                        *val = _val;
+                        return rc;
+                }
+        default:
+                return read_config_dword(bus, devfn, where, val);
+        }
+}
+
+static int config_write(struct pci_bus *bus, unsigned int devfn,
+                        int where, int size, u32 val)
+{
+        switch (size) {
+        case 1:
+                return write_config_byte(bus, devfn, where, (u8) val);
+        case 2:
+                return write_config_word(bus, devfn, where, (u16) val);
+        default:
+                return write_config_dword(bus, devfn, where, val);
+        }
+}
+
+
+struct pci_ops au1x_pci_ops = {
+        config_read,
+        config_write
+};