board/dave/common/pci.c

   1 /*
   2  * (C) Copyright 2001
   3  * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <asm/ppc4xx.h>
  10 #include <asm/processor.h>
  11 #include <pci.h>
  12
  13
  14 u_long pci9054_iobase;
  15
  16
  17 #define PCI_PRIMARY_CAR (0x500000dc) /* PCI config address reg */
  18 #define PCI_PRIMARY_CDR (0x80000000) /* PCI config data    reg */
  19
  20
  21 /*-----------------------------------------------------------------------------+
  22 |  Subroutine:  pci9054_read_config_dword
  23 |  Description: Read a PCI configuration register
  24 |  Inputs:
  25 |               hose            PCI Controller
  26 |               dev             PCI Bus+Device+Function number
  27 |               offset          Configuration register number
  28 |               value           Address of the configuration register value
  29 |  Return value:
  30 |               0               Successful
  31 +-----------------------------------------------------------------------------*/
  32 int pci9054_read_config_dword(struct pci_controller *hose,
  33                               pci_dev_t dev, int offset, u32* value)
  34 {
  35   unsigned long      conAdrVal;
  36   unsigned long      val;
  37
  38   /* generate coded value for CON_ADR register */
  39   conAdrVal = dev | (offset & 0xfc) | 0x80000000;
  40
  41   /* Load the CON_ADR (CAR) value first, then read from CON_DATA (CDR) */
  42   *(unsigned long *)PCI_PRIMARY_CAR = conAdrVal;
  43
  44   /* Note: *pResult comes back as -1 if machine check happened */
  45   val = in32r(PCI_PRIMARY_CDR);
  46
  47   *value = (unsigned long) val;
  48
  49   out32r(PCI_PRIMARY_CAR, 0);
  50
  51   if ((*(unsigned long *)0x50000304) & 0x60000000)
  52     {
  53       /* clear pci master/target abort bits */
  54       *(unsigned long *)0x50000304 = *(unsigned long *)0x50000304;
  55     }
  56
  57   return 0;
  58 }
  59
  60 /*-----------------------------------------------------------------------------+
  61 |  Subroutine:  pci9054_write_config_dword
  62 |  Description: Write a PCI configuration register.
  63 |  Inputs:
  64 |               hose            PCI Controller
  65 |               dev             PCI Bus+Device+Function number
  66 |               offset          Configuration register number
  67 |               Value           Configuration register value
  68 |  Return value:
  69 |               0               Successful
  70 | Updated for pass2 errata #6. Need to disable interrupts and clear the
  71 | PCICFGADR reg after writing the PCICFGDATA reg.
  72 +-----------------------------------------------------------------------------*/
  73 int pci9054_write_config_dword(struct pci_controller *hose,
  74                                pci_dev_t dev, int offset, u32 value)
  75 {
  76   unsigned long      conAdrVal;
  77
  78   conAdrVal = dev | (offset & 0xfc) | 0x80000000;
  79
  80   *(unsigned long *)PCI_PRIMARY_CAR = conAdrVal;
  81
  82   out32r(PCI_PRIMARY_CDR, value);
  83
  84   out32r(PCI_PRIMARY_CAR, 0);
  85
  86   /* clear pci master/target abort bits */
  87   *(unsigned long *)0x50000304 = *(unsigned long *)0x50000304;
  88
  89   return (0);
  90 }
  91
  92 /*-----------------------------------------------------------------------
  93  */
  94
  95 #ifdef CONFIG_DASA_SIM
  96 static void pci_dasa_sim_config_pci9054(struct pci_controller *hose, pci_dev_t dev,
  97                                         struct pci_config_table *_)
  98 {
  99   unsigned int iobase;
 100   unsigned short status = 0;
 101   unsigned char timer;
 102
 103   /*
 104    * Configure PLX PCI9054
 105    */
 106   pci_read_config_word(CONFIG_SYS_PCI9054_DEV_FN, PCI_COMMAND, &status);
 107   status |= PCI_COMMAND_MASTER | PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
 108   pci_write_config_word(CONFIG_SYS_PCI9054_DEV_FN, PCI_COMMAND, status);
 109
 110   /* Check the latency timer for values >= 0x60.
 111    */
 112   pci_read_config_byte(CONFIG_SYS_PCI9054_DEV_FN, PCI_LATENCY_TIMER, &timer);
 113   if (timer < 0x60)
 114     {
 115       pci_write_config_byte(CONFIG_SYS_PCI9054_DEV_FN, PCI_LATENCY_TIMER, 0x60);
 116     }
 117
 118   /* Set I/O base register.
 119    */
 120   pci_write_config_dword(CONFIG_SYS_PCI9054_DEV_FN, PCI_BASE_ADDRESS_0, CONFIG_SYS_PCI9054_IOBASE);
 121   pci_read_config_dword(CONFIG_SYS_PCI9054_DEV_FN, PCI_BASE_ADDRESS_0, &iobase);
 122
 123   pci9054_iobase = pci_mem_to_phys(CONFIG_SYS_PCI9054_DEV_FN, iobase & PCI_BASE_ADDRESS_MEM_MASK);
 124
 125   if (pci9054_iobase == 0xffffffff)
 126     {
 127       printf("Error: Can not set I/O base register.\n");
 128       return;
 129     }
 130 }
 131 #endif
 132
 133 static struct pci_config_table pci9054_config_table[] = {
 134 #ifndef CONFIG_PCI_PNP
 135   { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 136     PCI_BUS(CONFIG_SYS_ETH_DEV_FN), PCI_DEV(CONFIG_SYS_ETH_DEV_FN), PCI_FUNC(CONFIG_SYS_ETH_DEV_FN),
 137     pci_cfgfunc_config_device, { CONFIG_SYS_ETH_IOBASE,
 138                                  CONFIG_SYS_ETH_IOBASE,
 139                                  PCI_COMMAND_IO | PCI_COMMAND_MASTER }},
 140 #ifdef CONFIG_DASA_SIM
 141   { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 142     PCI_BUS(CONFIG_SYS_PCI9054_DEV_FN), PCI_DEV(CONFIG_SYS_PCI9054_DEV_FN), PCI_FUNC(CONFIG_SYS_PCI9054_DEV_FN),
 143     pci_dasa_sim_config_pci9054 },
 144 #endif
 145 #endif
 146   { }
 147 };
 148
 149 static struct pci_controller pci9054_hose = {
 150   config_table: pci9054_config_table,
 151 };
 152
 153 void pci_init(void)
 154 {
 155   struct pci_controller *hose = &pci9054_hose;
 156
 157   /*
 158    * Register the hose
 159    */
 160   hose->first_busno = 0;
 161   hose->last_busno = 0xff;
 162
 163   /* System memory space */
 164   pci_set_region(hose->regions + 0,
 165                  0x00000000, 0x00000000, 0x01000000,
 166                  PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
 167
 168   /* PCI Memory space */
 169   pci_set_region(hose->regions + 1,
 170                  0x00000000, 0xc0000000, 0x10000000,
 171                  PCI_REGION_MEM);
 172
 173   pci_set_ops(hose,
 174               pci_hose_read_config_byte_via_dword,
 175               pci_hose_read_config_word_via_dword,
 176               pci9054_read_config_dword,
 177               pci_hose_write_config_byte_via_dword,
 178               pci_hose_write_config_word_via_dword,
 179               pci9054_write_config_dword);
 180
 181   hose->region_count = 2;
 182
 183   pci_register_hose(hose);
 184
 185   hose->last_busno = pci_hose_scan(hose);
 186 }