arch/sh/drivers/pci/pci-sh5.c

   1 /*
   2  * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
   3  * Copyright (C) 2003, 2004 Paul Mundt
   4  * Copyright (C) 2004 Richard Curnow
   5  *
   6  * May be copied or modified under the terms of the GNU General Public
   7  * License.  See linux/COPYING for more information.
   8  *
   9  * Support functions for the SH5 PCI hardware.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/rwsem.h>
  14 #include <linux/smp.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/init.h>
  17 #include <linux/errno.h>
  18 #include <linux/pci.h>
  19 #include <linux/delay.h>
  20 #include <linux/types.h>
  21 #include <linux/irq.h>
  22 #include <cpu/irq.h>
  23 #include <asm/pci.h>
  24 #include <asm/io.h>
  25 #include "pci-sh5.h"
  26
  27 unsigned long pcicr_virt;
  28 unsigned long PCI_IO_AREA;
  29
  30 /* Rounds a number UP to the nearest power of two. Used for
  31  * sizing the PCI window.
  32  */
  33 static u32 __init r2p2(u32 num)
  34 {
  35         int i = 31;
  36         u32 tmp = num;
  37
  38         if (num == 0)
  39                 return 0;
  40
  41         do {
  42                 if (tmp & (1 << 31))
  43                         break;
  44                 i--;
  45                 tmp <<= 1;
  46         } while (i >= 0);
  47
  48         tmp = 1 << i;
  49         /* If the original number isn't a power of 2, round it up */
  50         if (tmp != num)
  51                 tmp <<= 1;
  52
  53         return tmp;
  54 }
  55
  56 static irqreturn_t pcish5_err_irq(int irq, void *dev_id)
  57 {
  58         struct pt_regs *regs = get_irq_regs();
  59         unsigned pci_int, pci_air, pci_cir, pci_aint;
  60
  61         pci_int = SH5PCI_READ(INT);
  62         pci_cir = SH5PCI_READ(CIR);
  63         pci_air = SH5PCI_READ(AIR);
  64
  65         if (pci_int) {
  66                 printk("PCI INTERRUPT (at %08llx)!\n", regs->pc);
  67                 printk("PCI INT -> 0x%x\n", pci_int & 0xffff);
  68                 printk("PCI AIR -> 0x%x\n", pci_air);
  69                 printk("PCI CIR -> 0x%x\n", pci_cir);
  70                 SH5PCI_WRITE(INT, ~0);
  71         }
  72
  73         pci_aint = SH5PCI_READ(AINT);
  74         if (pci_aint) {
  75                 printk("PCI ARB INTERRUPT!\n");
  76                 printk("PCI AINT -> 0x%x\n", pci_aint);
  77                 printk("PCI AIR -> 0x%x\n", pci_air);
  78                 printk("PCI CIR -> 0x%x\n", pci_cir);
  79                 SH5PCI_WRITE(AINT, ~0);
  80         }
  81
  82         return IRQ_HANDLED;
  83 }
  84
  85 static irqreturn_t pcish5_serr_irq(int irq, void *dev_id)
  86 {
  87         printk("SERR IRQ\n");
  88
  89         return IRQ_NONE;
  90 }
  91
  92 static struct resource sh5_pci_resources[2];
  93
  94 static struct pci_channel sh5pci_controller = {
  95         .pci_ops                = &sh5_pci_ops,
  96         .resources              = sh5_pci_resources,
  97         .nr_resources           = ARRAY_SIZE(sh5_pci_resources),
  98         .mem_offset             = 0x00000000,
  99         .io_offset              = 0x00000000,
 100 };
 101
 102 static int __init sh5pci_init(void)
 103 {
 104         unsigned long memStart = __pa(memory_start);
 105         unsigned long memSize = __pa(memory_end) - memStart;
 106         u32 lsr0;
 107         u32 uval;
 108
 109         if (request_irq(IRQ_ERR, pcish5_err_irq,
 110                         0, "PCI Error",NULL) < 0) {
 111                 printk(KERN_ERR "PCISH5: Cannot hook PCI_PERR interrupt\n");
 112                 return -EINVAL;
 113         }
 114
 115         if (request_irq(IRQ_SERR, pcish5_serr_irq,
 116                         0, "PCI SERR interrupt", NULL) < 0) {
 117                 printk(KERN_ERR "PCISH5: Cannot hook PCI_SERR interrupt\n");
 118                 return -EINVAL;
 119         }
 120
 121         pcicr_virt = (unsigned long)ioremap_nocache(SH5PCI_ICR_BASE, 1024);
 122         if (!pcicr_virt) {
 123                 panic("Unable to remap PCICR\n");
 124         }
 125
 126         PCI_IO_AREA = (unsigned long)ioremap_nocache(SH5PCI_IO_BASE, 0x10000);
 127         if (!PCI_IO_AREA) {
 128                 panic("Unable to remap PCIIO\n");
 129         }
 130
 131         /* Clear snoop registers */
 132         SH5PCI_WRITE(CSCR0, 0);
 133         SH5PCI_WRITE(CSCR1, 0);
 134
 135         /* Switch off interrupts */
 136         SH5PCI_WRITE(INTM,  0);
 137         SH5PCI_WRITE(AINTM, 0);
 138         SH5PCI_WRITE(PINTM, 0);
 139
 140         /* Set bus active, take it out of reset */
 141         uval = SH5PCI_READ(CR);
 142
 143         /* Set command Register */
 144         SH5PCI_WRITE(CR, uval | CR_LOCK_MASK | CR_CFINT| CR_FTO | CR_PFE |
 145                      CR_PFCS | CR_BMAM);
 146
 147         uval=SH5PCI_READ(CR);
 148
 149         /* Allow it to be a master */
 150         /* NB - WE DISABLE I/O ACCESS to stop overlap */
 151         /* set WAIT bit to enable stepping, an attempt to improve stability */
 152         SH5PCI_WRITE_SHORT(CSR_CMD,
 153                             PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 154                             PCI_COMMAND_WAIT);
 155
 156         /*
 157         ** Set translation mapping memory in order to convert the address
 158         ** used for the main bus, to the PCI internal address.
 159         */
 160         SH5PCI_WRITE(MBR,0x40000000);
 161
 162         /* Always set the max size 512M */
 163         SH5PCI_WRITE(MBMR, PCISH5_MEM_SIZCONV(512*1024*1024));
 164
 165         /*
 166         ** I/O addresses are mapped at internal PCI specific address
 167         ** as is described into the configuration bridge table.
 168         ** These are changed to 0, to allow cards that have legacy
 169         ** io such as vga to function correctly. We set the SH5 IOBAR to
 170         ** 256K, which is a bit big as we can only have 64K of address space
 171         */
 172
 173         SH5PCI_WRITE(IOBR,0x0);
 174
 175         /* Set up a 256K window. Totally pointless waste  of address space */
 176         SH5PCI_WRITE(IOBMR,0);
 177
 178         /* The SH5 has a HUGE 256K I/O region, which breaks the PCI spec.
 179          * Ideally, we would want to map the I/O region somewhere, but it
 180          * is so big this is not that easy!
 181          */
 182         SH5PCI_WRITE(CSR_IBAR0,~0);
 183         /* Set memory size value */
 184         memSize = memory_end - memory_start;
 185
 186         /* Now we set up the mbars so the PCI bus can see the memory of
 187          * the machine */
 188         if (memSize < (1024 * 1024)) {
 189                 printk(KERN_ERR "PCISH5: Ridiculous memory size of 0x%lx?\n",
 190                        memSize);
 191                 return -EINVAL;
 192         }
 193
 194         /* Set LSR 0 */
 195         lsr0 = (memSize > (512 * 1024 * 1024)) ? 0x1ff00001 :
 196                 ((r2p2(memSize) - 0x100000) | 0x1);
 197         SH5PCI_WRITE(LSR0, lsr0);
 198
 199         /* Set MBAR 0 */
 200         SH5PCI_WRITE(CSR_MBAR0, memory_start);
 201         SH5PCI_WRITE(LAR0, memory_start);
 202
 203         SH5PCI_WRITE(CSR_MBAR1,0);
 204         SH5PCI_WRITE(LAR1,0);
 205         SH5PCI_WRITE(LSR1,0);
 206
 207         /* Enable the PCI interrupts on the device */
 208         SH5PCI_WRITE(INTM,  ~0);
 209         SH5PCI_WRITE(AINTM, ~0);
 210         SH5PCI_WRITE(PINTM, ~0);
 211
 212         sh5_pci_resources[0].start = PCI_IO_AREA;
 213         sh5_pci_resources[0].end = PCI_IO_AREA + 0x10000;
 214
 215         sh5_pci_resources[1].start = memStart;
 216         sh5_pci_resources[1].end = memStart + memSize;
 217
 218         return register_pci_controller(&sh5pci_controller);
 219 }
 220 arch_initcall(sh5pci_init);