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_io_resource = { /* place holder */ };
  93 static struct resource sh5_mem_resource = { /* place holder */ };
  94
  95 static struct pci_channel sh5pci_controller = {
  96         .pci_ops                = &sh5_pci_ops,
  97         .mem_resource           = &sh5_mem_resource,
  98         .mem_offset             = 0x00000000,
  99         .io_resource            = &sh5_io_resource,
 100         .io_offset              = 0x00000000,
 101 };
 102
 103 static int __init sh5pci_init(void)
 104 {
 105         unsigned long memStart = __pa(memory_start);
 106         unsigned long memSize = __pa(memory_end) - memStart;
 107         u32 lsr0;
 108         u32 uval;
 109
 110         if (request_irq(IRQ_ERR, pcish5_err_irq,
 111                         IRQF_DISABLED, "PCI Error",NULL) < 0) {
 112                 printk(KERN_ERR "PCISH5: Cannot hook PCI_PERR interrupt\n");
 113                 return -EINVAL;
 114         }
 115
 116         if (request_irq(IRQ_SERR, pcish5_serr_irq,
 117                         IRQF_DISABLED, "PCI SERR interrupt", NULL) < 0) {
 118                 printk(KERN_ERR "PCISH5: Cannot hook PCI_SERR interrupt\n");
 119                 return -EINVAL;
 120         }
 121
 122         pcicr_virt = (unsigned long)ioremap_nocache(SH5PCI_ICR_BASE, 1024);
 123         if (!pcicr_virt) {
 124                 panic("Unable to remap PCICR\n");
 125         }
 126
 127         PCI_IO_AREA = (unsigned long)ioremap_nocache(SH5PCI_IO_BASE, 0x10000);
 128         if (!PCI_IO_AREA) {
 129                 panic("Unable to remap PCIIO\n");
 130         }
 131
 132         /* Clear snoop registers */
 133         SH5PCI_WRITE(CSCR0, 0);
 134         SH5PCI_WRITE(CSCR1, 0);
 135
 136         /* Switch off interrupts */
 137         SH5PCI_WRITE(INTM,  0);
 138         SH5PCI_WRITE(AINTM, 0);
 139         SH5PCI_WRITE(PINTM, 0);
 140
 141         /* Set bus active, take it out of reset */
 142         uval = SH5PCI_READ(CR);
 143
 144         /* Set command Register */
 145         SH5PCI_WRITE(CR, uval | CR_LOCK_MASK | CR_CFINT| CR_FTO | CR_PFE |
 146                      CR_PFCS | CR_BMAM);
 147
 148         uval=SH5PCI_READ(CR);
 149
 150         /* Allow it to be a master */
 151         /* NB - WE DISABLE I/O ACCESS to stop overlap */
 152         /* set WAIT bit to enable stepping, an attempt to improve stability */
 153         SH5PCI_WRITE_SHORT(CSR_CMD,
 154                             PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
 155                             PCI_COMMAND_WAIT);
 156
 157         /*
 158         ** Set translation mapping memory in order to convert the address
 159         ** used for the main bus, to the PCI internal address.
 160         */
 161         SH5PCI_WRITE(MBR,0x40000000);
 162
 163         /* Always set the max size 512M */
 164         SH5PCI_WRITE(MBMR, PCISH5_MEM_SIZCONV(512*1024*1024));
 165
 166         /*
 167         ** I/O addresses are mapped at internal PCI specific address
 168         ** as is described into the configuration bridge table.
 169         ** These are changed to 0, to allow cards that have legacy
 170         ** io such as vga to function correctly. We set the SH5 IOBAR to
 171         ** 256K, which is a bit big as we can only have 64K of address space
 172         */
 173
 174         SH5PCI_WRITE(IOBR,0x0);
 175
 176         /* Set up a 256K window. Totally pointless waste  of address space */
 177         SH5PCI_WRITE(IOBMR,0);
 178
 179         /* The SH5 has a HUGE 256K I/O region, which breaks the PCI spec.
 180          * Ideally, we would want to map the I/O region somewhere, but it
 181          * is so big this is not that easy!
 182          */
 183         SH5PCI_WRITE(CSR_IBAR0,~0);
 184         /* Set memory size value */
 185         memSize = memory_end - memory_start;
 186
 187         /* Now we set up the mbars so the PCI bus can see the memory of
 188          * the machine */
 189         if (memSize < (1024 * 1024)) {
 190                 printk(KERN_ERR "PCISH5: Ridiculous memory size of 0x%lx?\n",
 191                        memSize);
 192                 return -EINVAL;
 193         }
 194
 195         /* Set LSR 0 */
 196         lsr0 = (memSize > (512 * 1024 * 1024)) ? 0x1ff00001 :
 197                 ((r2p2(memSize) - 0x100000) | 0x1);
 198         SH5PCI_WRITE(LSR0, lsr0);
 199
 200         /* Set MBAR 0 */
 201         SH5PCI_WRITE(CSR_MBAR0, memory_start);
 202         SH5PCI_WRITE(LAR0, memory_start);
 203
 204         SH5PCI_WRITE(CSR_MBAR1,0);
 205         SH5PCI_WRITE(LAR1,0);
 206         SH5PCI_WRITE(LSR1,0);
 207
 208         /* Enable the PCI interrupts on the device */
 209         SH5PCI_WRITE(INTM,  ~0);
 210         SH5PCI_WRITE(AINTM, ~0);
 211         SH5PCI_WRITE(PINTM, ~0);
 212
 213         sh5_io_resource.start = PCI_IO_AREA;
 214         sh5_io_resource.end = PCI_IO_AREA + 0x10000;
 215
 216         sh5_mem_resource.start = memStart;
 217         sh5_mem_resource.end = memStart + memSize;
 218
 219         register_pci_controller(&sh5pci_controller);
 220
 221         return 0;
 222 }
 223 arch_initcall(sh5pci_init);