drivers/pci/tsi108_pci.c

   1 /*
   2  * (C) Copyright 2004 Tundra Semiconductor Corp.
   3  * Alex Bounine <alexandreb@tundra.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * PCI initialisation for the Tsi108 EMU board.
  26  */
  27
  28 #include <config.h>
  29
  30 #include <common.h>
  31 #include <pci.h>
  32 #include <asm/io.h>
  33 #include <tsi108.h>
  34 #if defined(CONFIG_OF_LIBFDT)
  35 #include <libfdt.h>
  36 #include <fdt_support.h>
  37 #endif
  38
  39 struct pci_controller local_hose;
  40
  41 void tsi108_clear_pci_error (void)
  42 {
  43         u32 err_stat, err_addr, pci_stat;
  44
  45         /*
  46          * Quietly clear errors signalled as result of PCI/X configuration read
  47          * requests.
  48          */
  49         /* Read PB Error Log Registers */
  50         err_stat = *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
  51                                      TSI108_PB_REG_OFFSET + PB_ERRCS);
  52         err_addr = *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
  53                                      TSI108_PB_REG_OFFSET + PB_AERR);
  54         if (err_stat & PB_ERRCS_ES) {
  55                 /* Clear PCI/X bus errors if applicable */
  56                 if ((err_addr & 0xFF000000) == CONFIG_SYS_PCI_CFG_BASE) {
  57                         /* Clear error flag */
  58                         *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE +
  59                                   TSI108_PB_REG_OFFSET + PB_ERRCS) =
  60                             PB_ERRCS_ES;
  61
  62                         /* Clear read error reported in PB_ISR */
  63                         *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE +
  64                                   TSI108_PB_REG_OFFSET + PB_ISR) =
  65                             PB_ISR_PBS_RD_ERR;
  66
  67                 /* Clear errors reported by PCI CSR (Normally Master Abort) */
  68                         pci_stat = *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
  69                                                      TSI108_PCI_REG_OFFSET +
  70                                                      PCI_CSR);
  71                         *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
  72                                           TSI108_PCI_REG_OFFSET + PCI_CSR) =
  73                             pci_stat;
  74
  75                         *(volatile u32 *)(CONFIG_SYS_TSI108_CSR_BASE +
  76                                           TSI108_PCI_REG_OFFSET +
  77                                           PCI_IRP_STAT) = PCI_IRP_STAT_P_CSR;
  78                 }
  79         }
  80
  81         return;
  82 }
  83
  84 unsigned int __get_pci_config_dword (u32 addr)
  85 {
  86         unsigned int retval;
  87
  88         __asm__ __volatile__ ("       lwbrx %0,0,%1\n"
  89                              "1:     eieio\n"
  90                              "2:\n"
  91                              ".section .fixup,\"ax\"\n"
  92                              "3:     li %0,-1\n"
  93                              "       b 2b\n"
  94                              ".section __ex_table,\"a\"\n"
  95                              "       .align 2\n"
  96                              "       .long 1b,3b\n"
  97                              ".text":"=r"(retval):"r"(addr));
  98
  99         return (retval);
 100 }
 101
 102 static int tsi108_read_config_dword (struct pci_controller *hose,
 103                                     pci_dev_t dev, int offset, u32 * value)
 104 {
 105         dev &= (CONFIG_SYS_PCI_CFG_SIZE - 1);
 106         dev |= (CONFIG_SYS_PCI_CFG_BASE | (offset & 0xfc));
 107         *value = __get_pci_config_dword(dev);
 108         if (0xFFFFFFFF == *value)
 109                 tsi108_clear_pci_error ();
 110         return 0;
 111 }
 112
 113 static int tsi108_write_config_dword (struct pci_controller *hose,
 114                                      pci_dev_t dev, int offset, u32 value)
 115 {
 116         dev &= (CONFIG_SYS_PCI_CFG_SIZE - 1);
 117         dev |= (CONFIG_SYS_PCI_CFG_BASE | (offset & 0xfc));
 118
 119         out_le32 ((volatile unsigned *)dev, value);
 120
 121         return 0;
 122 }
 123
 124 void pci_init_board (void)
 125 {
 126         struct pci_controller *hose = (struct pci_controller *)&local_hose;
 127
 128         hose->first_busno = 0;
 129         hose->last_busno = 0xff;
 130
 131         pci_set_region (hose->regions + 0,
 132                        CONFIG_SYS_PCI_MEMORY_BUS,
 133                        CONFIG_SYS_PCI_MEMORY_PHYS,
 134                        CONFIG_SYS_PCI_MEMORY_SIZE, PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
 135
 136         /* PCI memory space */
 137         pci_set_region (hose->regions + 1,
 138                        CONFIG_SYS_PCI_MEM_BUS,
 139                        CONFIG_SYS_PCI_MEM_PHYS, CONFIG_SYS_PCI_MEM_SIZE, PCI_REGION_MEM);
 140
 141         /* PCI I/O space */
 142         pci_set_region (hose->regions + 2,
 143                        CONFIG_SYS_PCI_IO_BUS,
 144                        CONFIG_SYS_PCI_IO_PHYS, CONFIG_SYS_PCI_IO_SIZE, PCI_REGION_IO);
 145
 146         hose->region_count = 3;
 147
 148         pci_set_ops (hose,
 149                     pci_hose_read_config_byte_via_dword,
 150                     pci_hose_read_config_word_via_dword,
 151                     tsi108_read_config_dword,
 152                     pci_hose_write_config_byte_via_dword,
 153                     pci_hose_write_config_word_via_dword,
 154                     tsi108_write_config_dword);
 155
 156         pci_register_hose (hose);
 157
 158         hose->last_busno = pci_hose_scan (hose);
 159
 160         debug ("Done PCI initialization\n");
 161         return;
 162 }
 163
 164 #if defined(CONFIG_OF_LIBFDT)
 165 void ft_pci_setup(void *blob, bd_t *bd)
 166 {
 167         int nodeoffset;
 168         int tmp[2];
 169         const char *path;
 170
 171         nodeoffset = fdt_path_offset(blob, "/aliases");
 172         if (nodeoffset >= 0) {
 173                 path = fdt_getprop(blob, nodeoffset, "pci", NULL);
 174                 if (path) {
 175                         tmp[0] = cpu_to_be32(local_hose.first_busno);
 176                         tmp[1] = cpu_to_be32(local_hose.last_busno);
 177                         do_fixup_by_path(blob, path, "bus-range",
 178                                 &tmp, sizeof(tmp), 1);
 179                 }
 180         }
 181 }
 182 #endif /* CONFIG_OF_LIBFDT */