1 files changed, 417 insertions, 0 deletions

diff --git a/arch/sh/drivers/pci/pci-sh7751.c b/arch/sh/drivers/pci/pci-sh7751.c
new file mode 100644
index 000000000000..30b14ac7ae5a
--- /dev/null
+++ b/arch/sh/drivers/pci/pci-sh7751.c
@@ -0,0 +1,417 @@
+/*
+ *      Low-Level PCI Support for the SH7751
+ *
+ *  Dustin McIntire (dustin@sensoria.com)
+ *      Derived from arch/i386/kernel/pci-*.c which bore the message:
+ *      (c) 1999--2000 Martin Mares <mj@ucw.cz>
+ *
+ *  Ported to the new API by Paul Mundt <lethal@linux-sh.org>
+ *  With cleanup by Paul van Gool <pvangool@mimotech.com>
+ *
+ *  May be copied or modified under the terms of the GNU General Public
+ *  License.  See linux/COPYING for more information.
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <linux/irq.h>
+#include <linux/delay.h>
+
+#include <asm/machvec.h>
+#include <asm/io.h>
+#include "pci-sh7751.h"
+
+static unsigned int pci_probe = PCI_PROBE_CONF1;
+extern int pci_fixup_pcic(void);
+
+void pcibios_fixup_irqs(void) __attribute__ ((weak));
+
+/*
+ * Direct access to PCI hardware...
+ */
+
+#define CONFIG_CMD(bus, devfn, where) (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
+
+/*
+ * Functions for accessing PCI configuration space with type 1 accesses
+ */
+static int sh7751_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 
+         */
+        local_irq_save(flags);
+        outl(CONFIG_CMD(bus,devfn,where), PCI_REG(SH7751_PCIPAR));
+        data = inl(PCI_REG(SH7751_PCIPDR));
+        local_irq_restore(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 SH7751 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 sh7751_pci_write(struct pci_bus *bus, unsigned int devfn,
+                            int where, int size, u32 val)
+{
+        unsigned long flags;
+        int shift;
+        u32 data;
+
+        local_irq_save(flags);
+        outl(CONFIG_CMD(bus,devfn,where), PCI_REG(SH7751_PCIPAR));
+        data = inl(PCI_REG(SH7751_PCIPDR));
+        local_irq_restore(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;
+        }
+
+        outl(data, PCI_REG(SH7751_PCIPDR));
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+#undef CONFIG_CMD
+
+struct pci_ops sh7751_pci_ops = {
+        .read           = sh7751_pci_read,
+        .write          = sh7751_pci_write,
+};
+
+static int __init pci_check_direct(void)
+{
+        unsigned int tmp, id;
+
+        /* check for SH7751/SH7751R hardware */
+        id = inl(SH7751_PCIREG_BASE+SH7751_PCICONF0);
+        if (id != ((SH7751_DEVICE_ID << 16) | SH7751_VENDOR_ID) &&
+            id != ((SH7751R_DEVICE_ID << 16) | SH7751_VENDOR_ID)) {
+                pr_debug("PCI: This is not an SH7751(R) (%x)\n", id);
+                return -ENODEV;
+        }
+
+        /*
+         * Check if configuration works.
+         */
+        if (pci_probe & PCI_PROBE_CONF1) {
+                tmp = inl (PCI_REG(SH7751_PCIPAR));
+                outl (0x80000000, PCI_REG(SH7751_PCIPAR));
+                if (inl (PCI_REG(SH7751_PCIPAR)) == 0x80000000) {
+                        outl (tmp, PCI_REG(SH7751_PCIPAR));
+                        printk(KERN_INFO "PCI: Using configuration type 1\n");
+                        request_region(PCI_REG(SH7751_PCIPAR), 8, "PCI conf1");
+                        return 0;
+                }
+                outl (tmp, PCI_REG(SH7751_PCIPAR));
+        }
+
+        pr_debug("PCI: pci_check_direct failed\n");
+        return -EINVAL;
+}
+
+/***************************************************************************************/
+
+/*
+ *  Handle bus scanning and 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);
+
+/*
+ *  Called after each bus is probed, but before its children
+ *  are examined.
+ */
+
+void __init pcibios_fixup_bus(struct pci_bus *b)
+{
+        pci_read_bridge_bases(b);
+}
+
+/*
+ * Initialization. Try all known PCI access methods. Note that we support
+ * using both PCI BIOS and direct access: in such cases, we use I/O ports
+ * to access config space.
+ * 
+ * Note that the platform specific initialization (BSC registers, and memory
+ * space mapping) will be called via the machine vectors (sh_mv.mv_pci_init()) if it
+ * exitst and via the platform defined function pcibios_init_platform().  
+ * See pci_bigsur.c for implementation;
+ * 
+ * The BIOS version of the pci functions is not yet implemented but it is left
+ * in for completeness.  Currently an error will be genereated at compile time. 
+ */
+
+static int __init sh7751_pci_init(void)
+{
+        int ret;
+
+        pr_debug("PCI: Starting intialization.\n");
+        if ((ret = pci_check_direct()) != 0)
+                return ret;
+
+        return pcibios_init_platform();
+}
+
+subsys_initcall(sh7751_pci_init);
+
+static int __init __area_sdram_check(unsigned int area)
+{
+        u32 word;
+
+        word = inl(SH7751_BCR1);
+        /* check BCR for SDRAM in area */
+        if(((word >> area) & 1) == 0) {
+                printk("PCI: Area %d is not configured for SDRAM. BCR1=0x%x\n",
+                       area, word);
+                return 0;
+        }
+        outl(word, PCI_REG(SH7751_PCIBCR1));
+
+        word = (u16)inw(SH7751_BCR2);
+        /* check BCR2 for 32bit SDRAM interface*/
+        if(((word >> (area << 1)) & 0x3) != 0x3) {
+                printk("PCI: Area %d is not 32 bit SDRAM. BCR2=0x%x\n",
+                       area, word);
+                return 0;
+        }
+        outl(word, PCI_REG(SH7751_PCIBCR2));
+
+        return 1;
+}
+
+int __init sh7751_pcic_init(struct sh7751_pci_address_map *map)
+{
+        u32 reg;
+        u32 word;
+
+        /* Set the BCR's to enable PCI access */
+        reg = inl(SH7751_BCR1);
+        reg |= 0x80000;
+        outl(reg, SH7751_BCR1);
+        
+        /* Turn the clocks back on (not done in reset)*/
+        outl(0, PCI_REG(SH7751_PCICLKR));
+        /* Clear Powerdown IRQ's (not done in reset) */
+        word = SH7751_PCIPINT_D3 | SH7751_PCIPINT_D0;
+        outl(word, PCI_REG(SH7751_PCIPINT));
+
+        /*
+         * This code is unused for some boards as it is done in the
+         * bootloader and doing it here means the MAC addresses loaded
+         * by the bootloader get lost.
+         */
+        if (!(map->flags & SH7751_PCIC_NO_RESET)) {
+                /* toggle PCI reset pin */
+                word = SH7751_PCICR_PREFIX | SH7751_PCICR_PRST;
+                outl(word,PCI_REG(SH7751_PCICR));
+                /* Wait for a long time... not 1 sec. but long enough */
+                mdelay(100);
+                word = SH7751_PCICR_PREFIX;
+                outl(word,PCI_REG(SH7751_PCICR));
+        }
+        
+        /* set the command/status bits to:
+         * Wait Cycle Control + Parity Enable + Bus Master +
+         * Mem space enable
+         */
+        word = SH7751_PCICONF1_WCC | SH7751_PCICONF1_PER | 
+               SH7751_PCICONF1_BUM | SH7751_PCICONF1_MES;
+        outl(word, PCI_REG(SH7751_PCICONF1));
+
+        /* define this host as the host bridge */
+        word = SH7751_PCI_HOST_BRIDGE << 24;
+        outl(word, PCI_REG(SH7751_PCICONF2));
+
+        /* Set IO and Mem windows to local address 
+         * Make PCI and local address the same for easy 1 to 1 mapping 
+         * Window0 = map->window0.size @ non-cached area base = SDRAM
+         * Window1 = map->window1.size @ cached area base = SDRAM 
+         */
+        word = map->window0.size - 1;
+        outl(word, PCI_REG(SH7751_PCILSR0));
+        word = map->window1.size - 1;
+        outl(word, PCI_REG(SH7751_PCILSR1));
+        /* Set the values on window 0 PCI config registers */
+        word = P2SEGADDR(map->window0.base);
+        outl(word, PCI_REG(SH7751_PCILAR0));
+        outl(word, PCI_REG(SH7751_PCICONF5));
+        /* Set the values on window 1 PCI config registers */
+        word =  PHYSADDR(map->window1.base);
+        outl(word, PCI_REG(SH7751_PCILAR1));
+        outl(word, PCI_REG(SH7751_PCICONF6));
+
+        /* Set the local 16MB PCI memory space window to 
+         * the lowest PCI mapped address
+         */
+        word = PCIBIOS_MIN_MEM & SH7751_PCIMBR_MASK;
+        PCIDBG(2,"PCI: Setting upper bits of Memory window to 0x%x\n", word);
+        outl(word , PCI_REG(SH7751_PCIMBR));
+
+        /* Map IO space into PCI IO window
+         * The IO window is 64K-PCIBIOS_MIN_IO in size
+         * IO addresses will be translated to the 
+         * PCI IO window base address
+         */
+        PCIDBG(3,"PCI: Mapping IO address 0x%x - 0x%x to base 0x%x\n", PCIBIOS_MIN_IO,
+            (64*1024), SH7751_PCI_IO_BASE+PCIBIOS_MIN_IO);
+
+        /* 
+         * XXX: For now, leave this board-specific. In the event we have other
+         * boards that need to do similar work, this can be wrapped.
+         */
+#ifdef CONFIG_SH_BIGSUR
+        bigsur_port_map(PCIBIOS_MIN_IO, (64*1024), SH7751_PCI_IO_BASE+PCIBIOS_MIN_IO,0);
+#endif
+
+        /* Make sure the MSB's of IO window are set to access PCI space correctly */
+        word = PCIBIOS_MIN_IO & SH7751_PCIIOBR_MASK;
+        PCIDBG(2,"PCI: Setting upper bits of IO window to 0x%x\n", word);
+        outl(word, PCI_REG(SH7751_PCIIOBR));
+        
+        /* Set PCI WCRx, BCRx's, copy from BSC locations */
+
+        /* check BCR for SDRAM in specified area */
+        switch (map->window0.base) {
+        case SH7751_CS0_BASE_ADDR: word = __area_sdram_check(0); break;
+        case SH7751_CS1_BASE_ADDR: word = __area_sdram_check(1); break;
+        case SH7751_CS2_BASE_ADDR: word = __area_sdram_check(2); break;
+        case SH7751_CS3_BASE_ADDR: word = __area_sdram_check(3); break;
+        case SH7751_CS4_BASE_ADDR: word = __area_sdram_check(4); break;
+        case SH7751_CS5_BASE_ADDR: word = __area_sdram_check(5); break;
+        case SH7751_CS6_BASE_ADDR: word = __area_sdram_check(6); break;
+        }
+        
+        if (!word)
+                return 0;
+
+        /* configure the wait control registers */
+        word = inl(SH7751_WCR1);
+        outl(word, PCI_REG(SH7751_PCIWCR1));
+        word = inl(SH7751_WCR2);
+        outl(word, PCI_REG(SH7751_PCIWCR2));
+        word = inl(SH7751_WCR3);
+        outl(word, PCI_REG(SH7751_PCIWCR3));
+        word = inl(SH7751_MCR);
+        outl(word, PCI_REG(SH7751_PCIMCR));
+
+        /* NOTE: I'm ignoring the PCI error IRQs for now..
+         * TODO: add support for the internal error interrupts and
+         * DMA interrupts...
+         */
+
+#ifdef CONFIG_SH_RTS7751R2D
+        pci_fixup_pcic();
+#endif
+
+        /* SH7751 init done, set central function init complete */
+        /* use round robin mode to stop a device starving/overruning */
+        word = SH7751_PCICR_PREFIX | SH7751_PCICR_CFIN | SH7751_PCICR_ARBM;
+        outl(word,PCI_REG(SH7751_PCICR)); 
+
+        return 1;
+}
+
+char * __init pcibios_setup(char *str)
+{
+        if (!strcmp(str, "off")) {
+                pci_probe = 0;
+                return NULL;
+        }
+
+        return str;
+}
+
+/* 
+ *      IRQ functions 
+ */
+static u8 __init sh7751_no_swizzle(struct pci_dev *dev, u8 *pin)
+{
+        /* no swizzling */
+        return PCI_SLOT(dev->devfn);
+}
+
+static int sh7751_pci_lookup_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+        int irq = -1;
+
+        /* now lookup the actual IRQ on a platform specific basis (pci-'platform'.c) */
+        irq = pcibios_map_platform_irq(slot,pin);
+        if( irq < 0 ) {
+                pr_debug("PCI: Error mapping IRQ on device %s\n", pci_name(dev));
+                return irq;
+        }
+
+        pr_debug("Setting IRQ for slot %s to %d\n", pci_name(dev), irq);
+
+        return irq;
+}
+
+void __init pcibios_fixup_irqs(void)
+{
+        pci_fixup_irqs(sh7751_no_swizzle, sh7751_pci_lookup_irq);
+}
+