arch/mips/pci/ops-pnx8550.c

   1 /*
   2  *
   3  *  BRIEF MODULE DESCRIPTION
   4  *
   5  *  2.6 port, Embedded Alley Solutions, Inc
   6  *
   7  *  Based on:
   8  *  Author: source@mvista.com
   9  *
  10  *  This program is free software; you can distribute it and/or modify it
  11  *  under the terms of the GNU General Public License (Version 2) as
  12  *  published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope it will be useful, but WITHOUT
  15  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  *  for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  */
  23 #include <linux/types.h>
  24 #include <linux/pci.h>
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/delay.h>
  29
  30 #include <asm/mach-pnx8550/pci.h>
  31 #include <asm/mach-pnx8550/glb.h>
  32 #include <asm/debug.h>
  33
  34
  35 static inline void clear_status(void)
  36 {
  37         unsigned long pci_stat;
  38
  39         pci_stat = inl(PCI_BASE | PCI_GPPM_STATUS);
  40         outl(pci_stat, PCI_BASE | PCI_GPPM_ICLR);
  41 }
  42
  43 static inline unsigned int
  44 calc_cfg_addr(struct pci_bus *bus, unsigned int devfn, int where)
  45 {
  46         unsigned int addr;
  47
  48         addr = ((bus->number > 0) ? (((bus->number & 0xff) << PCI_CFG_BUS_SHIFT) | 1) : 0);
  49         addr |= ((devfn & 0xff) << PCI_CFG_FUNC_SHIFT) | (where & 0xfc);
  50
  51         return addr;
  52 }
  53
  54 static int
  55 config_access(unsigned int pci_cmd, struct pci_bus *bus, unsigned int devfn, int where, unsigned int pci_mode, unsigned int *val)
  56 {
  57         unsigned int flags;
  58         unsigned long loops = 0;
  59         unsigned long ioaddr = calc_cfg_addr(bus, devfn, where);
  60
  61         local_irq_save(flags);
  62         /*Clear pending interrupt status */
  63         if (inl(PCI_BASE | PCI_GPPM_STATUS)) {
  64                 clear_status();
  65                 while (!(inl(PCI_BASE | PCI_GPPM_STATUS) == 0)) ;
  66         }
  67
  68         outl(ioaddr, PCI_BASE | PCI_GPPM_ADDR);
  69
  70         if ((pci_cmd == PCI_CMD_IOW) || (pci_cmd == PCI_CMD_CONFIG_WRITE))
  71                 outl(*val, PCI_BASE | PCI_GPPM_WDAT);
  72
  73         outl(INIT_PCI_CYCLE | pci_cmd | (pci_mode & PCI_BYTE_ENABLE_MASK),
  74              PCI_BASE | PCI_GPPM_CTRL);
  75
  76         loops =
  77             ((loops_per_jiffy *
  78               PCI_IO_JIFFIES_TIMEOUT) >> (PCI_IO_JIFFIES_SHIFT));
  79         while (1) {
  80                 if (inl(PCI_BASE | PCI_GPPM_STATUS) & GPPM_DONE) {
  81                         if ((pci_cmd == PCI_CMD_IOR) ||
  82                             (pci_cmd == PCI_CMD_CONFIG_READ))
  83                                 *val = inl(PCI_BASE | PCI_GPPM_RDAT);
  84                         clear_status();
  85                         local_irq_restore(flags);
  86                         return PCIBIOS_SUCCESSFUL;
  87                 } else if (inl(PCI_BASE | PCI_GPPM_STATUS) & GPPM_R_MABORT) {
  88                         break;
  89                 }
  90
  91                 loops--;
  92                 if (loops == 0) {
  93                         printk("%s : Arbiter Locked.\n", __FUNCTION__);
  94                 }
  95         }
  96
  97         clear_status();
  98         if ((pci_cmd == PCI_CMD_IOR) || (pci_cmd == PCI_CMD_IOW)) {
  99                 printk("%s timeout (GPPM_CTRL=%X) ioaddr %lX pci_cmd %X\n",
 100                        __FUNCTION__, inl(PCI_BASE | PCI_GPPM_CTRL), ioaddr,
 101                        pci_cmd);
 102         }
 103
 104         if ((pci_cmd == PCI_CMD_IOR) || (pci_cmd == PCI_CMD_CONFIG_READ))
 105                 *val = 0xffffffff;
 106         local_irq_restore(flags);
 107         return PCIBIOS_DEVICE_NOT_FOUND;
 108 }
 109
 110 /*
 111  * We can't address 8 and 16 bit words directly.  Instead we have to
 112  * read/write a 32bit word and mask/modify the data we actually want.
 113  */
 114 static int
 115 read_config_byte(struct pci_bus *bus, unsigned int devfn, int where, u8 * val)
 116 {
 117         unsigned int data = 0;
 118         int err;
 119
 120         if (bus == 0)
 121                 return -1;
 122
 123         err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(1 << (where & 3)), &data);
 124         switch (where & 0x03) {
 125         case 0:
 126                 *val = (unsigned char)(data & 0x000000ff);
 127                 break;
 128         case 1:
 129                 *val = (unsigned char)((data & 0x0000ff00) >> 8);
 130                 break;
 131         case 2:
 132                 *val = (unsigned char)((data & 0x00ff0000) >> 16);
 133                 break;
 134         case 3:
 135                 *val = (unsigned char)((data & 0xff000000) >> 24);
 136                 break;
 137         }
 138
 139         return err;
 140 }
 141
 142 static int
 143 read_config_word(struct pci_bus *bus, unsigned int devfn, int where, u16 * val)
 144 {
 145         unsigned int data = 0;
 146         int err;
 147
 148         if (bus == 0)
 149                 return -1;
 150
 151         if (where & 0x01)
 152                 return PCIBIOS_BAD_REGISTER_NUMBER;
 153
 154         err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(3 << (where & 3)), &data);
 155         switch (where & 0x02) {
 156         case 0:
 157                 *val = (unsigned short)(data & 0x0000ffff);
 158                 break;
 159         case 2:
 160                 *val = (unsigned short)((data & 0xffff0000) >> 16);
 161                 break;
 162         }
 163
 164         return err;
 165 }
 166
 167 static int
 168 read_config_dword(struct pci_bus *bus, unsigned int devfn, int where, u32 * val)
 169 {
 170         int err;
 171         if (bus == 0)
 172                 return -1;
 173
 174         if (where & 0x03)
 175                 return PCIBIOS_BAD_REGISTER_NUMBER;
 176
 177         err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, 0, val);
 178
 179         return err;
 180 }
 181
 182 static int
 183 write_config_byte(struct pci_bus *bus, unsigned int devfn, int where, u8 val)
 184 {
 185         unsigned int data = (unsigned int)val;
 186         int err;
 187
 188         if (bus == 0)
 189                 return -1;
 190
 191         switch (where & 0x03) {
 192         case 1:
 193                 data = (data << 8);
 194                 break;
 195         case 2:
 196                 data = (data << 16);
 197                 break;
 198         case 3:
 199                 data = (data << 24);
 200                 break;
 201         default:
 202                 break;
 203         }
 204
 205         err = config_access(PCI_CMD_CONFIG_READ, bus, devfn, where, ~(1 << (where & 3)), &data);
 206
 207         return err;
 208 }
 209
 210 static int
 211 write_config_word(struct pci_bus *bus, unsigned int devfn, int where, u16 val)
 212 {
 213         unsigned int data = (unsigned int)val;
 214         int err;
 215
 216         if (bus == 0)
 217                 return -1;
 218
 219         if (where & 0x01)
 220                 return PCIBIOS_BAD_REGISTER_NUMBER;
 221
 222         switch (where & 0x02) {
 223         case 2:
 224                 data = (data << 16);
 225                 break;
 226         default:
 227                 break;
 228         }
 229         err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, ~(3 << (where & 3)), &data);
 230
 231         return err;
 232 }
 233
 234 static int
 235 write_config_dword(struct pci_bus *bus, unsigned int devfn, int where, u32 val)
 236 {
 237         int err;
 238         if (bus == 0)
 239                 return -1;
 240
 241         if (where & 0x03)
 242                 return PCIBIOS_BAD_REGISTER_NUMBER;
 243
 244         err = config_access(PCI_CMD_CONFIG_WRITE, bus, devfn, where, 0, &val);
 245
 246         return err;
 247 }
 248
 249 static int config_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
 250 {
 251         switch (size) {
 252         case 1: {
 253                         u8 _val;
 254                         int rc = read_config_byte(bus, devfn, where, &_val);
 255                         *val = _val;
 256                         return rc;
 257                 }
 258        case 2: {
 259                         u16 _val;
 260                         int rc = read_config_word(bus, devfn, where, &_val);
 261                         *val = _val;
 262                         return rc;
 263                 }
 264         default:
 265                 return read_config_dword(bus, devfn, where, val);
 266         }
 267 }
 268
 269 static int config_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
 270 {
 271         switch (size) {
 272         case 1:
 273                 return write_config_byte(bus, devfn, where, (u8) val);
 274         case 2:
 275                 return write_config_word(bus, devfn, where, (u16) val);
 276         default:
 277                 return write_config_dword(bus, devfn, where, val);
 278         }
 279 }
 280
 281 struct pci_ops pnx8550_pci_ops = {
 282         config_read,
 283         config_write
 284 };