arch/mips/pci/pci-excite.c

   1 /*
   2  *  Copyright (C) 2004 by Basler Vision Technologies AG
   3  *  Author: Thomas Koeller <thomas.koeller@baslerweb.com>
   4  *  Based on the PMC-Sierra Yosemite board support by Ralf Baechle.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/pci.h>
  24 #include <linux/bitops.h>
  25 #include <asm/rm9k-ocd.h>
  26 #include <excite.h>
  27
  28
  29 extern struct pci_ops titan_pci_ops;
  30
  31
  32 static struct resource
  33         mem_resource =  {
  34                 .name   = "PCI memory",
  35                 .start  = EXCITE_PHYS_PCI_MEM,
  36                 .end    = EXCITE_PHYS_PCI_MEM + EXCITE_SIZE_PCI_MEM - 1,
  37                 .flags  = IORESOURCE_MEM
  38         },
  39         io_resource = {
  40                 .name   = "PCI I/O",
  41                 .start  = EXCITE_PHYS_PCI_IO,
  42                 .end    = EXCITE_PHYS_PCI_IO + EXCITE_SIZE_PCI_IO - 1,
  43                 .flags  = IORESOURCE_IO
  44         };
  45
  46
  47 static struct pci_controller bx_controller = {
  48         .pci_ops        = &titan_pci_ops,
  49         .mem_resource   = &mem_resource,
  50         .mem_offset     = 0x00000000UL,
  51         .io_resource    = &io_resource,
  52         .io_offset      = 0x00000000UL
  53 };
  54
  55
  56 static char
  57         iopage_failed[] __initdata   = "Cannot allocate PCI I/O page",
  58         modebits_no_pci[] __initdata = "PCI is not configured in mode bits";
  59
  60 #define RM9000x2_OCD_HTSC       0x0604
  61 #define RM9000x2_OCD_HTBHL      0x060c
  62 #define RM9000x2_OCD_PCIHRST    0x078c
  63
  64 #define RM9K_OCD_MODEBIT1       0x00d4 /* (MODEBIT1) Mode Bit 1 */
  65 #define RM9K_OCD_CPHDCR         0x00f4 /* CPU-PCI/HT Data Control. */
  66
  67 #define PCISC_FB2B              0x00000200
  68 #define PCISC_MWICG             0x00000010
  69 #define PCISC_EMC               0x00000004
  70 #define PCISC_ERMA              0x00000002
  71
  72
  73
  74 static int __init basler_excite_pci_setup(void)
  75 {
  76         const unsigned int fullbars = memsize / (256 << 20);
  77         unsigned int i;
  78
  79         /* Check modebits to see if PCI is really enabled. */
  80         if (!((ocd_readl(RM9K_OCD_MODEBIT1) >> (47-32)) & 0x1))
  81                 panic(modebits_no_pci);
  82
  83         if (NULL == request_mem_region(EXCITE_PHYS_PCI_IO, EXCITE_SIZE_PCI_IO,
  84                                        "Memory-mapped PCI I/O page"))
  85                 panic(iopage_failed);
  86
  87         /* Enable PCI 0 as master for config cycles */
  88         ocd_writel(PCISC_EMC | PCISC_ERMA, RM9000x2_OCD_HTSC);
  89
  90
  91         /* Set up latency timer */
  92         ocd_writel(0x8008, RM9000x2_OCD_HTBHL);
  93
  94         /*  Setup host IO and Memory space */
  95         ocd_writel((EXCITE_PHYS_PCI_IO >> 4) | 1, LKB7);
  96         ocd_writel(((EXCITE_SIZE_PCI_IO >> 4) & 0x7fffff00) - 0x100, LKM7);
  97         ocd_writel((EXCITE_PHYS_PCI_MEM >> 4) | 1, LKB8);
  98         ocd_writel(((EXCITE_SIZE_PCI_MEM >> 4) & 0x7fffff00) - 0x100, LKM8);
  99
 100         /* Set up PCI BARs to map all installed memory */
 101         for (i = 0; i < 6; i++) {
 102                 const unsigned int bar = 0x610 + i * 4;
 103
 104                 if (i < fullbars) {
 105                         ocd_writel(0x10000000 * i, bar);
 106                         ocd_writel(0x01000000 * i, bar + 0x140);
 107                         ocd_writel(0x0ffff029, bar + 0x100);
 108                         continue;
 109                 }
 110
 111                 if (i == fullbars) {
 112                         int o;
 113                         u32 mask;
 114
 115                         const unsigned long rem = memsize - i * 0x10000000;
 116                         if (!rem) {
 117                                 ocd_writel(0x00000000, bar + 0x100);
 118                                 continue;
 119                         }
 120
 121                         o = ffs(rem) - 1;
 122                         if (rem & ~(0x1 << o))
 123                                 o++;
 124                         mask = ((0x1 << o) & 0x0ffff000) - 0x1000;
 125                         ocd_writel(0x10000000 * i, bar);
 126                         ocd_writel(0x01000000 * i, bar + 0x140);
 127                         ocd_writel(0x00000029 | mask, bar + 0x100);
 128                         continue;
 129                 }
 130
 131                 ocd_writel(0x00000000, bar + 0x100);
 132         }
 133
 134         /* Finally, enable the PCI interrupt */
 135 #if USB_IRQ > 7
 136         set_c0_intcontrol(1 << USB_IRQ);
 137 #else
 138         set_c0_status(1 << (USB_IRQ + 8));
 139 #endif
 140
 141         ioport_resource.start = EXCITE_PHYS_PCI_IO;
 142         ioport_resource.end = EXCITE_PHYS_PCI_IO + EXCITE_SIZE_PCI_IO - 1;
 143         set_io_port_base((unsigned long) ioremap_nocache(EXCITE_PHYS_PCI_IO, EXCITE_SIZE_PCI_IO));
 144         register_pci_controller(&bx_controller);
 145         return 0;
 146 }
 147
 148
 149 arch_initcall(basler_excite_pci_setup);