arch/sh/drivers/pci/fixups-se7751.c

   1 #include <linux/kernel.h>
   2 #include <linux/types.h>
   3 #include <linux/init.h>
   4 #include <linux/delay.h>
   5 #include <linux/pci.h>
   6 #include <linux/io.h>
   7 #include <linux/sh_intc.h>
   8 #include "pci-sh4.h"
   9
  10 int __init pcibios_map_platform_irq(const struct pci_dev *, u8 slot, u8 pin)
  11 {
  12         switch (slot) {
  13         case 0: return evt2irq(0x3a0);
  14         case 1: return evt2irq(0x3a0);  /* AMD Ethernet controller */
  15         case 2: return -1;
  16         case 3: return -1;
  17         case 4: return -1;
  18         default:
  19                 printk("PCI: Bad IRQ mapping request for slot %d\n", slot);
  20                 return -1;
  21         }
  22 }
  23
  24 #define PCIMCR_MRSET_OFF        0xBFFFFFFF
  25 #define PCIMCR_RFSH_OFF         0xFFFFFFFB
  26
  27 /*
  28  * Only long word accesses of the PCIC's internal local registers and the
  29  * configuration registers from the CPU is supported.
  30  */
  31 #define PCIC_WRITE(x,v) writel((v), PCI_REG(x))
  32 #define PCIC_READ(x) readl(PCI_REG(x))
  33
  34 /*
  35  * Description:  This function sets up and initializes the pcic, sets
  36  * up the BARS, maps the DRAM into the address space etc, etc.
  37  */
  38 int pci_fixup_pcic(struct pci_channel *chan)
  39 {
  40         unsigned long bcr1, wcr1, wcr2, wcr3, mcr;
  41         unsigned short bcr2;
  42
  43         /*
  44         * Initialize the slave bus controller on the pcic.  The values used
  45         * here should not be hardcoded, but they should be taken from the bsc
  46         * on the processor, to make this function as generic as possible.
  47         * (i.e. Another sbc may usr different SDRAM timing settings -- in order
  48         * for the pcic to work, its settings need to be exactly the same.)
  49         */
  50         bcr1 = (*(volatile unsigned long*)(SH7751_BCR1));
  51         bcr2 = (*(volatile unsigned short*)(SH7751_BCR2));
  52         wcr1 = (*(volatile unsigned long*)(SH7751_WCR1));
  53         wcr2 = (*(volatile unsigned long*)(SH7751_WCR2));
  54         wcr3 = (*(volatile unsigned long*)(SH7751_WCR3));
  55         mcr = (*(volatile unsigned long*)(SH7751_MCR));
  56
  57         bcr1 = bcr1 | 0x00080000;  /* Enable Bit 19, BREQEN */
  58         (*(volatile unsigned long*)(SH7751_BCR1)) = bcr1;
  59
  60         bcr1 = bcr1 | 0x40080000;  /* Enable Bit 19 BREQEN, set PCIC to slave */
  61         PCIC_WRITE(SH7751_PCIBCR1, bcr1);        /* PCIC BCR1 */
  62         PCIC_WRITE(SH7751_PCIBCR2, bcr2);     /* PCIC BCR2 */
  63         PCIC_WRITE(SH7751_PCIWCR1, wcr1);     /* PCIC WCR1 */
  64         PCIC_WRITE(SH7751_PCIWCR2, wcr2);     /* PCIC WCR2 */
  65         PCIC_WRITE(SH7751_PCIWCR3, wcr3);     /* PCIC WCR3 */
  66         mcr = (mcr & PCIMCR_MRSET_OFF) & PCIMCR_RFSH_OFF;
  67         PCIC_WRITE(SH7751_PCIMCR, mcr);      /* PCIC MCR */
  68
  69
  70         /* Enable all interrupts, so we know what to fix */
  71         PCIC_WRITE(SH7751_PCIINTM, 0x0000c3ff);
  72         PCIC_WRITE(SH7751_PCIAINTM, 0x0000380f);
  73
  74         /* Set up standard PCI config registers */
  75         PCIC_WRITE(SH7751_PCICONF1,     0xF39000C7); /* Bus Master, Mem & I/O access */
  76         PCIC_WRITE(SH7751_PCICONF2,     0x00000000); /* PCI Class code & Revision ID */
  77         PCIC_WRITE(SH7751_PCICONF4,     0xab000001); /* PCI I/O address (local regs) */
  78         PCIC_WRITE(SH7751_PCICONF5,     0x0c000000); /* PCI MEM address (local RAM)  */
  79         PCIC_WRITE(SH7751_PCICONF6,     0xd0000000); /* PCI MEM address (unused)     */
  80         PCIC_WRITE(SH7751_PCICONF11, 0x35051054); /* PCI Subsystem ID & Vendor ID */
  81         PCIC_WRITE(SH7751_PCILSR0, 0x03f00000);   /* MEM (full 64M exposed)       */
  82         PCIC_WRITE(SH7751_PCILSR1, 0x00000000);   /* MEM (unused)                 */
  83         PCIC_WRITE(SH7751_PCILAR0, 0x0c000000);   /* MEM (direct map from PCI)    */
  84         PCIC_WRITE(SH7751_PCILAR1, 0x00000000);   /* MEM (unused)                 */
  85
  86         /* Now turn it on... */
  87         PCIC_WRITE(SH7751_PCICR, 0xa5000001);
  88
  89         /*
  90         * Set PCIMBR and PCIIOBR here, assuming a single window
  91         * (16M MEM, 256K IO) is enough.  If a larger space is
  92         * needed, the readx/writex and inx/outx functions will
  93         * have to do more (e.g. setting registers for each call).
  94         */
  95
  96         /*
  97         * Set the MBR so PCI address is one-to-one with window,
  98         * meaning all calls go straight through... use BUG_ON to
  99         * catch erroneous assumption.
 100         */
 101         BUG_ON(chan->resources[1].start != SH7751_PCI_MEMORY_BASE);
 102
 103         PCIC_WRITE(SH7751_PCIMBR, chan->resources[1].start);
 104
 105         /* Set IOBR for window containing area specified in pci.h */
 106         PCIC_WRITE(SH7751_PCIIOBR, (chan->resources[0].start & SH7751_PCIIOBR_MASK));
 107
 108         /* All done, may as well say so... */
 109         printk("SH7751 PCI: Finished initialization of the PCI controller\n");
 110
 111         return 1;
 112 }