arch/mips/pci/pci-rc32434.c

   1 /*
   2  *  BRIEF MODULE DESCRIPTION
   3  *     PCI initialization for IDT EB434 board
   4  *
   5  *  Copyright 2004 IDT Inc. (rischelp@idt.com)
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  *
  12  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  13  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  14  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  15  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  16  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  17  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  18  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  19  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  20  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  21  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  22  *
  23  *  You should have received a copy of the  GNU General Public License along
  24  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  25  *  675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/types.h>
  29 #include <linux/pci.h>
  30 #include <linux/kernel.h>
  31 #include <linux/init.h>
  32
  33 #include <asm/mach-rc32434/rc32434.h>
  34 #include <asm/mach-rc32434/pci.h>
  35
  36 #define PCI_ACCESS_READ  0
  37 #define PCI_ACCESS_WRITE 1
  38
  39 /* define an unsigned array for the PCI registers */
  40 static unsigned int korina_cnfg_regs[25] = {
  41         KORINA_CNFG1, KORINA_CNFG2, KORINA_CNFG3, KORINA_CNFG4,
  42         KORINA_CNFG5, KORINA_CNFG6, KORINA_CNFG7, KORINA_CNFG8,
  43         KORINA_CNFG9, KORINA_CNFG10, KORINA_CNFG11, KORINA_CNFG12,
  44         KORINA_CNFG13, KORINA_CNFG14, KORINA_CNFG15, KORINA_CNFG16,
  45         KORINA_CNFG17, KORINA_CNFG18, KORINA_CNFG19, KORINA_CNFG20,
  46         KORINA_CNFG21, KORINA_CNFG22, KORINA_CNFG23, KORINA_CNFG24
  47 };
  48 static struct resource rc32434_res_pci_mem1;
  49 static struct resource rc32434_res_pci_mem2;
  50
  51 static struct resource rc32434_res_pci_mem1 = {
  52         .name = "PCI MEM1",
  53         .start = 0x50000000,
  54         .end = 0x5FFFFFFF,
  55         .flags = IORESOURCE_MEM,
  56         .sibling = NULL,
  57         .child = &rc32434_res_pci_mem2
  58 };
  59
  60 static struct resource rc32434_res_pci_mem2 = {
  61         .name = "PCI Mem2",
  62         .start = 0x60000000,
  63         .end = 0x6FFFFFFF,
  64         .flags = IORESOURCE_MEM,
  65         .parent = &rc32434_res_pci_mem1,
  66         .sibling = NULL,
  67         .child = NULL
  68 };
  69
  70 static struct resource rc32434_res_pci_io1 = {
  71         .name = "PCI I/O1",
  72         .start = 0x18800000,
  73         .end = 0x188FFFFF,
  74         .flags = IORESOURCE_IO,
  75 };
  76
  77 extern struct pci_ops rc32434_pci_ops;
  78
  79 #define PCI_MEM1_START  PCI_ADDR_START
  80 #define PCI_MEM1_END    (PCI_ADDR_START + CPUTOPCI_MEM_WIN - 1)
  81 #define PCI_MEM2_START  (PCI_ADDR_START + CPUTOPCI_MEM_WIN)
  82 #define PCI_MEM2_END    (PCI_ADDR_START + (2 * CPUTOPCI_MEM_WIN)  - 1)
  83 #define PCI_IO1_START   (PCI_ADDR_START + (2 * CPUTOPCI_MEM_WIN))
  84 #define PCI_IO1_END                                                     \
  85         (PCI_ADDR_START + (2 * CPUTOPCI_MEM_WIN) + CPUTOPCI_IO_WIN - 1)
  86 #define PCI_IO2_START                                                   \
  87         (PCI_ADDR_START + (2 * CPUTOPCI_MEM_WIN) + CPUTOPCI_IO_WIN)
  88 #define PCI_IO2_END                                                     \
  89         (PCI_ADDR_START + (2 * CPUTOPCI_MEM_WIN) + (2 * CPUTOPCI_IO_WIN) - 1)
  90
  91 struct pci_controller rc32434_controller2;
  92
  93 struct pci_controller rc32434_controller = {
  94         .pci_ops = &rc32434_pci_ops,
  95         .mem_resource = &rc32434_res_pci_mem1,
  96         .io_resource = &rc32434_res_pci_io1,
  97         .mem_offset = 0,
  98         .io_offset = 0,
  99
 100 };
 101
 102 #ifdef __MIPSEB__
 103 #define PCI_ENDIAN_FLAG PCILBAC_sb_m
 104 #else
 105 #define PCI_ENDIAN_FLAG 0
 106 #endif
 107
 108 static int __init rc32434_pcibridge_init(void)
 109 {
 110         unsigned int pcicvalue, pcicdata = 0;
 111         unsigned int dummyread, pcicntlval;
 112         int loopCount;
 113         unsigned int pci_config_addr;
 114
 115         pcicvalue = rc32434_pci->pcic;
 116         pcicvalue = (pcicvalue >> PCIM_SHFT) & PCIM_BIT_LEN;
 117         if (!((pcicvalue == PCIM_H_EA) ||
 118               (pcicvalue == PCIM_H_IA_FIX) ||
 119               (pcicvalue == PCIM_H_IA_RR))) {
 120                 pr_err("PCI init error!!!\n");
 121                 /* Not in Host Mode, return ERROR */
 122                 return -1;
 123         }
 124         /* Enables the Idle Grant mode, Arbiter Parking */
 125         pcicdata |= (PCI_CTL_IGM | PCI_CTL_EAP | PCI_CTL_EN);
 126         rc32434_pci->pcic = pcicdata;   /* Enable the PCI bus Interface */
 127         /* Zero out the PCI status & PCI Status Mask */
 128         for (;;) {
 129                 pcicdata = rc32434_pci->pcis;
 130                 if (!(pcicdata & PCI_STAT_RIP))
 131                         break;
 132         }
 133
 134         rc32434_pci->pcis = 0;
 135         rc32434_pci->pcism = 0xFFFFFFFF;
 136         /* Zero out the PCI decoupled registers */
 137         rc32434_pci->pcidac = 0;        /*
 138                                          * disable PCI decoupled accesses at
 139                                          * initialization
 140                                          */
 141         rc32434_pci->pcidas = 0;        /* clear the status */
 142         rc32434_pci->pcidasm = 0x0000007F;      /* Mask all the interrupts */
 143         /* Mask PCI Messaging Interrupts */
 144         rc32434_pci_msg->pciiic = 0;
 145         rc32434_pci_msg->pciiim = 0xFFFFFFFF;
 146         rc32434_pci_msg->pciioic = 0;
 147         rc32434_pci_msg->pciioim = 0;
 148
 149
 150         /* Setup PCILB0 as Memory Window */
 151         rc32434_pci->pcilba[0].address = (unsigned int) (PCI_ADDR_START);
 152
 153         /* setup the PCI map address as same as the local address */
 154
 155         rc32434_pci->pcilba[0].mapping = (unsigned int) (PCI_ADDR_START);
 156
 157
 158         /* Setup PCILBA1 as MEM */
 159         rc32434_pci->pcilba[0].control =
 160             (((SIZE_256MB & 0x1f) << PCI_LBAC_SIZE_BIT) | PCI_ENDIAN_FLAG);
 161         dummyread = rc32434_pci->pcilba[0].control;     /* flush the CPU write Buffers */
 162         rc32434_pci->pcilba[1].address = 0x60000000;
 163         rc32434_pci->pcilba[1].mapping = 0x60000000;
 164
 165         /* setup PCILBA2 as IO Window */
 166         rc32434_pci->pcilba[1].control =
 167             (((SIZE_256MB & 0x1f) << PCI_LBAC_SIZE_BIT) | PCI_ENDIAN_FLAG);
 168         dummyread = rc32434_pci->pcilba[1].control;     /* flush the CPU write Buffers */
 169         rc32434_pci->pcilba[2].address = 0x18C00000;
 170         rc32434_pci->pcilba[2].mapping = 0x18FFFFFF;
 171
 172         /* setup PCILBA2 as IO Window */
 173         rc32434_pci->pcilba[2].control =
 174             (((SIZE_4MB & 0x1f) << PCI_LBAC_SIZE_BIT) | PCI_ENDIAN_FLAG);
 175         dummyread = rc32434_pci->pcilba[2].control;     /* flush the CPU write Buffers */
 176
 177         /* Setup PCILBA3 as IO Window */
 178         rc32434_pci->pcilba[3].address = 0x18800000;
 179         rc32434_pci->pcilba[3].mapping = 0x18800000;
 180         rc32434_pci->pcilba[3].control =
 181             ((((SIZE_1MB & 0x1ff) << PCI_LBAC_SIZE_BIT) | PCI_LBAC_MSI) |
 182              PCI_ENDIAN_FLAG);
 183         dummyread = rc32434_pci->pcilba[3].control;     /* flush the CPU write Buffers */
 184
 185         pci_config_addr = (unsigned int) (0x80000004);
 186         for (loopCount = 0; loopCount < 24; loopCount++) {
 187                 rc32434_pci->pcicfga = pci_config_addr;
 188                 dummyread = rc32434_pci->pcicfga;
 189                 rc32434_pci->pcicfgd = korina_cnfg_regs[loopCount];
 190                 dummyread = rc32434_pci->pcicfgd;
 191                 pci_config_addr += 4;
 192         }
 193         rc32434_pci->pcitc =
 194             (unsigned int) ((PCITC_RTIMER_VAL & 0xff) << PCI_TC_RTIMER_BIT) |
 195             ((PCITC_DTIMER_VAL & 0xff) << PCI_TC_DTIMER_BIT);
 196
 197         pcicntlval = rc32434_pci->pcic;
 198         pcicntlval &= ~PCI_CTL_TNR;
 199         rc32434_pci->pcic = pcicntlval;
 200         pcicntlval = rc32434_pci->pcic;
 201
 202         return 0;
 203 }
 204
 205 static int __init rc32434_pci_init(void)
 206 {
 207         void __iomem *io_map_base;
 208
 209         pr_info("PCI: Initializing PCI\n");
 210
 211         ioport_resource.start = rc32434_res_pci_io1.start;
 212         ioport_resource.end = rc32434_res_pci_io1.end;
 213
 214         rc32434_pcibridge_init();
 215
 216         io_map_base = ioremap(rc32434_res_pci_io1.start,
 217                               resource_size(&rc32434_res_pci_io1));
 218
 219         if (!io_map_base)
 220                 return -ENOMEM;
 221
 222         rc32434_controller.io_map_base =
 223                 (unsigned long)io_map_base - rc32434_res_pci_io1.start;
 224
 225         register_pci_controller(&rc32434_controller);
 226         rc32434_sync();
 227
 228         return 0;
 229 }
 230
 231 arch_initcall(rc32434_pci_init);