arch/mips/pnx8550/common/pci.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *
   5  * Author: source@mvista.com
   6  *
   7  *  This program is free software; you can distribute it and/or modify it
   8  *  under the terms of the GNU General Public License (Version 2) as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope it will be useful, but WITHOUT
  12  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  *  for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License along
  17  *  with this program; if not, write to the Free Software Foundation, Inc.,
  18  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  19  */
  20 #include <linux/types.h>
  21 #include <linux/pci.h>
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24
  25 #include <pci.h>
  26 #include <glb.h>
  27 #include <nand.h>
  28
  29 static struct resource pci_io_resource = {
  30         .start  = PNX8550_PCIIO + 0x1000,       /* reserve regacy I/O space */
  31         .end    = PNX8550_PCIIO + PNX8550_PCIIO_SIZE,
  32         .name   = "pci IO space",
  33         .flags  = IORESOURCE_IO
  34 };
  35
  36 static struct resource pci_mem_resource = {
  37         .start  = PNX8550_PCIMEM,
  38         .end    = PNX8550_PCIMEM + PNX8550_PCIMEM_SIZE - 1,
  39         .name   = "pci memory space",
  40         .flags  = IORESOURCE_MEM
  41 };
  42
  43 extern struct pci_ops pnx8550_pci_ops;
  44
  45 static struct pci_controller pnx8550_controller = {
  46         .pci_ops        = &pnx8550_pci_ops,
  47         .io_map_base    = PNX8550_PORT_BASE,
  48         .io_resource    = &pci_io_resource,
  49         .mem_resource   = &pci_mem_resource,
  50 };
  51
  52 /* Return the total size of DRAM-memory, (RANK0 + RANK1) */
  53 static inline unsigned long get_system_mem_size(void)
  54 {
  55         /* Read IP2031_RANK0_ADDR_LO */
  56         unsigned long dram_r0_lo = inl(PCI_BASE | 0x65010);
  57         /* Read IP2031_RANK1_ADDR_HI */
  58         unsigned long dram_r1_hi = inl(PCI_BASE | 0x65018);
  59
  60         return dram_r1_hi - dram_r0_lo + 1;
  61 }
  62
  63 static int __init pnx8550_pci_setup(void)
  64 {
  65         int pci_mem_code;
  66         int mem_size = get_system_mem_size() >> 20;
  67
  68         /* Clear the Global 2 Register, PCI Inta Output Enable Registers
  69            Bit 1:Enable DAC Powerdown
  70           -> 0:DACs are enabled and are working normally
  71              1:DACs are powerdown
  72            Bit 0:Enable of PCI inta output
  73           -> 0 = Disable PCI inta output
  74              1 = Enable PCI inta output
  75         */
  76         PNX8550_GLB2_ENAB_INTA_O = 0;
  77
  78         /* Calc the PCI mem size code */
  79         if (mem_size >= 128)
  80                 pci_mem_code = SIZE_128M;
  81         else if (mem_size >= 64)
  82                 pci_mem_code = SIZE_64M;
  83         else if (mem_size >= 32)
  84                 pci_mem_code = SIZE_32M;
  85         else
  86                 pci_mem_code = SIZE_16M;
  87
  88         /* Set PCI_XIO registers */
  89         outl(pci_mem_resource.start, PCI_BASE | PCI_BASE1_LO);
  90         outl(pci_mem_resource.end + 1, PCI_BASE | PCI_BASE1_HI);
  91         outl(pci_io_resource.start, PCI_BASE | PCI_BASE2_LO);
  92         outl(pci_io_resource.end, PCI_BASE | PCI_BASE2_HI);
  93
  94         /* Send memory transaction via PCI_BASE2 */
  95         outl(0x00000001, PCI_BASE | PCI_IO);
  96
  97         /* Unlock the setup register */
  98         outl(0xca, PCI_BASE | PCI_UNLOCKREG);
  99
 100         /*
 101          * BAR0 of PNX8550 (pci base 10) must be zero in order for ide
 102          * to work, and in order for bus_to_baddr to work without any
 103          * hacks.
 104          */
 105         outl(0x00000000, PCI_BASE | PCI_BASE10);
 106
 107         /*
 108          *These two bars are set by default or the boot code.
 109          * However, it's safer to set them here so we're not boot
 110          * code dependent.
 111          */
 112         outl(0x1be00000, PCI_BASE | PCI_BASE14);  /* PNX MMIO */
 113         outl(PNX8550_NAND_BASE_ADDR, PCI_BASE | PCI_BASE18);  /* XIO      */
 114
 115         outl(PCI_EN_TA |
 116              PCI_EN_PCI2MMI |
 117              PCI_EN_XIO |
 118              PCI_SETUP_BASE18_SIZE(SIZE_32M) |
 119              PCI_SETUP_BASE18_EN |
 120              PCI_SETUP_BASE14_EN |
 121              PCI_SETUP_BASE10_PREF |
 122              PCI_SETUP_BASE10_SIZE(pci_mem_code) |
 123              PCI_SETUP_CFGMANAGE_EN |
 124              PCI_SETUP_PCIARB_EN,
 125              PCI_BASE |
 126              PCI_SETUP);        /* PCI_SETUP */
 127         outl(0x00000000, PCI_BASE | PCI_CTRL);  /* PCI_CONTROL */
 128
 129         register_pci_controller(&pnx8550_controller);
 130
 131         return 0;
 132 }
 133
 134 arch_initcall(pnx8550_pci_setup);