arch/ppc/platforms/prpmc800.c

   1 /*
   2  * arch/ppc/platforms/prpmc800.c
   3  *
   4  * Author: Dale Farnsworth <dale.farnsworth@mvista.com>
   5  *
   6  * 2001-2004 (c) MontaVista, Software, Inc.  This file is licensed under
   7  * the terms of the GNU General Public License version 2.  This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/stddef.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/errno.h>
  17 #include <linux/reboot.h>
  18 #include <linux/pci.h>
  19 #include <linux/kdev_t.h>
  20 #include <linux/types.h>
  21 #include <linux/major.h>
  22 #include <linux/initrd.h>
  23 #include <linux/console.h>
  24 #include <linux/delay.h>
  25 #include <linux/irq.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/ide.h>
  28 #include <linux/root_dev.h>
  29 #include <linux/harrier_defs.h>
  30
  31 #include <asm/byteorder.h>
  32 #include <asm/system.h>
  33 #include <asm/pgtable.h>
  34 #include <asm/page.h>
  35 #include <asm/dma.h>
  36 #include <asm/io.h>
  37 #include <asm/irq.h>
  38 #include <asm/machdep.h>
  39 #include <asm/time.h>
  40 #include <asm/pci-bridge.h>
  41 #include <asm/open_pic.h>
  42 #include <asm/bootinfo.h>
  43 #include <asm/harrier.h>
  44
  45 #include "prpmc800.h"
  46
  47 #define HARRIER_REVI_REG        (PRPMC800_HARRIER_XCSR_BASE+HARRIER_REVI_OFF)
  48 #define HARRIER_UCTL_REG        (PRPMC800_HARRIER_XCSR_BASE+HARRIER_UCTL_OFF)
  49 #define HARRIER_MISC_CSR_REG   (PRPMC800_HARRIER_XCSR_BASE+HARRIER_MISC_CSR_OFF)
  50 #define HARRIER_IFEVP_REG    (PRPMC800_HARRIER_MPIC_BASE+HARRIER_MPIC_IFEVP_OFF)
  51 #define HARRIER_IFEDE_REG    (PRPMC800_HARRIER_MPIC_BASE+HARRIER_MPIC_IFEDE_OFF)
  52 #define HARRIER_FEEN_REG        (PRPMC800_HARRIER_XCSR_BASE+HARRIER_FEEN_OFF)
  53 #define HARRIER_FEMA_REG        (PRPMC800_HARRIER_XCSR_BASE+HARRIER_FEMA_OFF)
  54
  55 #define HARRIER_VENI_REG        (PRPMC800_HARRIER_XCSR_BASE + HARRIER_VENI_OFF)
  56 #define HARRIER_MISC_CSR        (PRPMC800_HARRIER_XCSR_BASE + \
  57                                  HARRIER_MISC_CSR_OFF)
  58
  59 #define MONARCH (monarch != 0)
  60 #define NON_MONARCH (monarch == 0)
  61
  62 extern int mpic_init(void);
  63 extern unsigned long loops_per_jiffy;
  64 extern void gen550_progress(char *, unsigned short);
  65
  66 static int monarch = 0;
  67 static int found_self = 0;
  68 static int self = 0;
  69
  70 static u_char prpmc800_openpic_initsenses[] __initdata =
  71 {
  72    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HOSTINT0 */
  73    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
  74    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_DEBUGINT */
  75    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HARRIER_WDT */
  76    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
  77    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
  78    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HOSTINT1 */
  79    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HOSTINT2 */
  80    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HOSTINT3 */
  81    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_PMC_INTA */
  82    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_PMC_INTB */
  83    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_PMC_INTC */
  84    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_PMC_INTD */
  85    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
  86    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
  87    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_UNUSED */
  88    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),   /* PRPMC800_INT_HARRIER_INT (UARTS, ABORT, DMA) */
  89 };
  90
  91 /*
  92  * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
  93  * Combined irq tables.  Only Base has IDSEL 14, only Carrier has 21 and 22.
  94  */
  95 static inline int
  96 prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  97 {
  98         static char pci_irq_table[][4] =
  99         /*
 100          *      PCI IDSEL/INTPIN->INTLINE
 101          *      A       B       C       D
 102          */
 103         {
 104                 {12,    0,      0,      0},  /* IDSEL 14 - Ethernet, base */
 105                 {0,     0,      0,      0},  /* IDSEL 15 - unused */
 106                 {10,    11,     12,     9},  /* IDSEL 16 - PMC A1, PMC1 */
 107                 {10,    11,     12,     9},  /* IDSEL 17 - PrPMC-A-B, PMC2-B */
 108                 {11,    12,     9,      10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
 109                 {0,     0,      0,      0},  /* IDSEL 19 - unused */
 110                 {9,     10,     11,     12}, /* IDSEL 20 - P2P Bridge */
 111                 {11,    12,     9,      10}, /* IDSEL 21 - PMC A2, carrier */
 112                 {12,    9,      10,     11}, /* IDSEL 22 - PMC A2-B, carrier */
 113         };
 114         const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
 115         return PCI_IRQ_TABLE_LOOKUP;
 116 };
 117
 118 static int
 119 prpmc_read_config_dword(struct pci_controller *hose, u8 bus, u8 devfn,
 120                         int offset, u32 * val)
 121 {
 122         /* paranoia */
 123         if ((hose == NULL) ||
 124             (hose->cfg_addr == NULL) || (hose->cfg_data == NULL))
 125                 return PCIBIOS_DEVICE_NOT_FOUND;
 126
 127         out_be32(hose->cfg_addr, ((offset & 0xfc) << 24) | (devfn << 16)
 128                  | ((bus - hose->bus_offset) << 8) | 0x80);
 129         *val = in_le32((u32 *) (hose->cfg_data + (offset & 3)));
 130
 131         return PCIBIOS_SUCCESSFUL;
 132 }
 133
 134 #define HARRIER_PCI_VEND_DEV_ID (PCI_VENDOR_ID_MOTOROLA | \
 135                                  (PCI_DEVICE_ID_MOTOROLA_HARRIER << 16))
 136 static int prpmc_self(u8 bus, u8 devfn)
 137 {
 138         /*
 139          * Harriers always view themselves as being on bus 0. If we're not
 140          * looking at bus 0, we're not going to find ourselves.
 141          */
 142         if (bus != 0)
 143                 return PCIBIOS_DEVICE_NOT_FOUND;
 144         else {
 145                 int result;
 146                 int val;
 147                 struct pci_controller *hose;
 148
 149                 hose = pci_bus_to_hose(bus);
 150
 151                 /* See if target device is a Harrier */
 152                 result = prpmc_read_config_dword(hose, bus, devfn,
 153                                                  PCI_VENDOR_ID, &val);
 154                 if ((result != PCIBIOS_SUCCESSFUL) ||
 155                     (val != HARRIER_PCI_VEND_DEV_ID))
 156                         return PCIBIOS_DEVICE_NOT_FOUND;
 157
 158                 /*
 159                  * LBA bit is set if target Harrier == initiating Harrier
 160                  * (i.e. if we are reading our own PCI header).
 161                  */
 162                 result = prpmc_read_config_dword(hose, bus, devfn,
 163                                                  HARRIER_LBA_OFF, &val);
 164                 if ((result != PCIBIOS_SUCCESSFUL) ||
 165                     ((val & HARRIER_LBA_MSK) != HARRIER_LBA_MSK))
 166                         return PCIBIOS_DEVICE_NOT_FOUND;
 167
 168                 /* It's us, save our location for later */
 169                 self = devfn;
 170                 found_self = 1;
 171                 return PCIBIOS_SUCCESSFUL;
 172         }
 173 }
 174
 175 static int prpmc_exclude_device(u8 bus, u8 devfn)
 176 {
 177         /*
 178          * Monarch is allowed to access all PCI devices. Non-monarch is
 179          * only allowed to access its own Harrier.
 180          */
 181
 182         if (MONARCH)
 183                 return PCIBIOS_SUCCESSFUL;
 184         if (found_self)
 185                 if ((bus == 0) && (devfn == self))
 186                         return PCIBIOS_SUCCESSFUL;
 187                 else
 188                         return PCIBIOS_DEVICE_NOT_FOUND;
 189         else
 190                 return prpmc_self(bus, devfn);
 191 }
 192
 193 void __init prpmc800_find_bridges(void)
 194 {
 195         struct pci_controller *hose;
 196         int host_bridge;
 197
 198         hose = pcibios_alloc_controller();
 199         if (!hose)
 200                 return;
 201
 202         hose->first_busno = 0;
 203         hose->last_busno = 0xff;
 204
 205         ppc_md.pci_exclude_device = prpmc_exclude_device;
 206         ppc_md.pcibios_fixup = NULL;
 207         ppc_md.pcibios_fixup_bus = NULL;
 208         ppc_md.pci_swizzle = common_swizzle;
 209         ppc_md.pci_map_irq = prpmc_map_irq;
 210
 211         setup_indirect_pci(hose,
 212                            PRPMC800_PCI_CONFIG_ADDR, PRPMC800_PCI_CONFIG_DATA);
 213
 214         /* Get host bridge vendor/dev id */
 215
 216         host_bridge = in_be32((uint *) (HARRIER_VENI_REG));
 217
 218         if (host_bridge != HARRIER_VEND_DEV_ID) {
 219                 printk(KERN_CRIT "Host bridge 0x%x not supported\n",
 220                                 host_bridge);
 221                 return;
 222         }
 223
 224         monarch = in_be32((uint *) HARRIER_MISC_CSR) & HARRIER_SYSCON;
 225
 226         printk(KERN_INFO "Running as %s.\n",
 227                         MONARCH ? "Monarch" : "Non-Monarch");
 228
 229         hose->io_space.start = PRPMC800_PCI_IO_START;
 230         hose->io_space.end = PRPMC800_PCI_IO_END;
 231         hose->io_base_virt = (void *)PRPMC800_ISA_IO_BASE;
 232         hose->pci_mem_offset = PRPMC800_PCI_PHY_MEM_OFFSET;
 233
 234         pci_init_resource(&hose->io_resource,
 235                           PRPMC800_PCI_IO_START, PRPMC800_PCI_IO_END,
 236                           IORESOURCE_IO, "PCI host bridge");
 237
 238         if (MONARCH) {
 239                 hose->mem_space.start = PRPMC800_PCI_MEM_START;
 240                 hose->mem_space.end = PRPMC800_PCI_MEM_END;
 241
 242                 pci_init_resource(&hose->mem_resources[0],
 243                                   PRPMC800_PCI_MEM_START,
 244                                   PRPMC800_PCI_MEM_END,
 245                                   IORESOURCE_MEM, "PCI host bridge");
 246
 247                 if (harrier_init(hose,
 248                                  PRPMC800_HARRIER_XCSR_BASE,
 249                                  PRPMC800_PROC_PCI_MEM_START,
 250                                  PRPMC800_PROC_PCI_MEM_END,
 251                                  PRPMC800_PROC_PCI_IO_START,
 252                                  PRPMC800_PROC_PCI_IO_END,
 253                                  PRPMC800_HARRIER_MPIC_BASE) != 0)
 254                         printk(KERN_CRIT "Could not initialize HARRIER "
 255                                          "bridge\n");
 256
 257                 harrier_release_eready(PRPMC800_HARRIER_XCSR_BASE);
 258                 harrier_wait_eready(PRPMC800_HARRIER_XCSR_BASE);
 259                 hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 260
 261         } else {
 262                 pci_init_resource(&hose->mem_resources[0],
 263                                   PRPMC800_NM_PCI_MEM_START,
 264                                   PRPMC800_NM_PCI_MEM_END,
 265                                   IORESOURCE_MEM, "PCI host bridge");
 266
 267                 hose->mem_space.start = PRPMC800_NM_PCI_MEM_START;
 268                 hose->mem_space.end = PRPMC800_NM_PCI_MEM_END;
 269
 270                 if (harrier_init(hose,
 271                                  PRPMC800_HARRIER_XCSR_BASE,
 272                                  PRPMC800_NM_PROC_PCI_MEM_START,
 273                                  PRPMC800_NM_PROC_PCI_MEM_END,
 274                                  PRPMC800_PROC_PCI_IO_START,
 275                                  PRPMC800_PROC_PCI_IO_END,
 276                                  PRPMC800_HARRIER_MPIC_BASE) != 0)
 277                         printk(KERN_CRIT "Could not initialize HARRIER "
 278                                          "bridge\n");
 279
 280                 harrier_setup_nonmonarch(PRPMC800_HARRIER_XCSR_BASE,
 281                                          HARRIER_ITSZ_1MB);
 282                 harrier_release_eready(PRPMC800_HARRIER_XCSR_BASE);
 283         }
 284 }
 285
 286 static int prpmc800_show_cpuinfo(struct seq_file *m)
 287 {
 288         seq_printf(m, "machine\t\t: PrPMC800\n");
 289
 290         return 0;
 291 }
 292
 293 static void __init prpmc800_setup_arch(void)
 294 {
 295         /* init to some ~sane value until calibrate_delay() runs */
 296         loops_per_jiffy = 50000000 / HZ;
 297
 298         /* Lookup PCI host bridges */
 299         prpmc800_find_bridges();
 300
 301 #ifdef CONFIG_BLK_DEV_INITRD
 302         if (initrd_start)
 303                 ROOT_DEV = Root_RAM0;
 304         else
 305 #endif
 306 #ifdef CONFIG_ROOT_NFS
 307                 ROOT_DEV = Root_NFS;
 308 #else
 309                 ROOT_DEV = Root_SDA2;
 310 #endif
 311
 312         printk(KERN_INFO "Port by MontaVista Software, Inc. "
 313                          "(source@mvista.com)\n");
 314 }
 315
 316 /*
 317  * Compute the PrPMC800's tbl frequency using the baud clock as a reference.
 318  */
 319 static void __init prpmc800_calibrate_decr(void)
 320 {
 321         unsigned long tbl_start, tbl_end;
 322         unsigned long current_state, old_state, tb_ticks_per_second;
 323         unsigned int count;
 324         unsigned int harrier_revision;
 325
 326         harrier_revision = readb(HARRIER_REVI_REG);
 327         if (harrier_revision < 2) {
 328                 /* XTAL64 was broken in harrier revision 1 */
 329                 printk(KERN_INFO "time_init: Harrier revision %d, assuming "
 330                                  "100 Mhz bus\n", harrier_revision);
 331                 tb_ticks_per_second = 100000000 / 4;
 332                 tb_ticks_per_jiffy = tb_ticks_per_second / HZ;
 333                 tb_to_us = mulhwu_scale_factor(tb_ticks_per_second, 1000000);
 334                 return;
 335         }
 336
 337         /*
 338          * The XTAL64 bit oscillates at the 1/64 the base baud clock
 339          * Set count to XTAL64 cycles per second.  Since we'll count
 340          * half-cycles, we'll reach the count in half a second.
 341          */
 342         count = PRPMC800_BASE_BAUD / 64;
 343
 344         /* Find the first edge of the baud clock */
 345         old_state = readb(HARRIER_UCTL_REG) & HARRIER_XTAL64_MASK;
 346         do {
 347                 current_state = readb(HARRIER_UCTL_REG) & HARRIER_XTAL64_MASK;
 348         } while (old_state == current_state);
 349
 350         old_state = current_state;
 351
 352         /* Get the starting time base value */
 353         tbl_start = get_tbl();
 354
 355         /*
 356          * Loop until we have found a number of edges (half-cycles)
 357          * equal to the count (half a second)
 358          */
 359         do {
 360                 do {
 361                         current_state = readb(HARRIER_UCTL_REG) &
 362                             HARRIER_XTAL64_MASK;
 363                 } while (old_state == current_state);
 364                 old_state = current_state;
 365         } while (--count);
 366
 367         /* Get the ending time base value */
 368         tbl_end = get_tbl();
 369
 370         /* We only counted for half a second, so double to get ticks/second */
 371         tb_ticks_per_second = (tbl_end - tbl_start) * 2;
 372         tb_ticks_per_jiffy = tb_ticks_per_second / HZ;
 373         tb_to_us = mulhwu_scale_factor(tb_ticks_per_second, 1000000);
 374 }
 375
 376 static void prpmc800_restart(char *cmd)
 377 {
 378         ulong temp;
 379
 380         local_irq_disable();
 381         temp = in_be32((uint *) HARRIER_MISC_CSR_REG);
 382         temp |= HARRIER_RSTOUT;
 383         out_be32((uint *) HARRIER_MISC_CSR_REG, temp);
 384         while (1) ;
 385 }
 386
 387 static void prpmc800_halt(void)
 388 {
 389         local_irq_disable();
 390         while (1) ;
 391 }
 392
 393 static void prpmc800_power_off(void)
 394 {
 395         prpmc800_halt();
 396 }
 397
 398 static void __init prpmc800_init_IRQ(void)
 399 {
 400         OpenPIC_InitSenses = prpmc800_openpic_initsenses;
 401         OpenPIC_NumInitSenses = sizeof(prpmc800_openpic_initsenses);
 402
 403         /* Setup external interrupt sources. */
 404         openpic_set_sources(0, 16, OpenPIC_Addr + 0x10000);
 405         /* Setup internal UART interrupt source. */
 406         openpic_set_sources(16, 1, OpenPIC_Addr + 0x10200);
 407
 408         /* Do the MPIC initialization based on the above settings. */
 409         openpic_init(0);
 410
 411         /* enable functional exceptions for uarts and abort */
 412         out_8((u8 *) HARRIER_FEEN_REG, (HARRIER_FE_UA0 | HARRIER_FE_UA1));
 413         out_8((u8 *) HARRIER_FEMA_REG, ~(HARRIER_FE_UA0 | HARRIER_FE_UA1));
 414 }
 415
 416 /*
 417  * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 418  */
 419 static __inline__ void prpmc800_set_bat(void)
 420 {
 421         mb();
 422         mtspr(SPRN_DBAT1U, 0xf0001ffe);
 423         mtspr(SPRN_DBAT1L, 0xf000002a);
 424         mb();
 425 }
 426
 427 /*
 428  * We need to read the Harrier memory controller
 429  * to properly determine this value
 430  */
 431 static unsigned long __init prpmc800_find_end_of_memory(void)
 432 {
 433         /* Read the memory size from the Harrier XCSR */
 434         return harrier_get_mem_size(PRPMC800_HARRIER_XCSR_BASE);
 435 }
 436
 437 static void __init prpmc800_map_io(void)
 438 {
 439         io_block_mapping(0x80000000, 0x80000000, 0x10000000, _PAGE_IO);
 440         io_block_mapping(0xf0000000, 0xf0000000, 0x10000000, _PAGE_IO);
 441 }
 442
 443 void __init
 444 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 445               unsigned long r6, unsigned long r7)
 446 {
 447         parse_bootinfo(find_bootinfo());
 448
 449         prpmc800_set_bat();
 450
 451         isa_io_base = PRPMC800_ISA_IO_BASE;
 452         isa_mem_base = PRPMC800_ISA_MEM_BASE;
 453         pci_dram_offset = PRPMC800_PCI_DRAM_OFFSET;
 454
 455         ppc_md.setup_arch = prpmc800_setup_arch;
 456         ppc_md.show_cpuinfo = prpmc800_show_cpuinfo;
 457         ppc_md.init_IRQ = prpmc800_init_IRQ;
 458         ppc_md.get_irq = openpic_get_irq;
 459
 460         ppc_md.find_end_of_memory = prpmc800_find_end_of_memory;
 461         ppc_md.setup_io_mappings = prpmc800_map_io;
 462
 463         ppc_md.restart = prpmc800_restart;
 464         ppc_md.power_off = prpmc800_power_off;
 465         ppc_md.halt = prpmc800_halt;
 466
 467         /* PrPMC800 has no timekeeper part */
 468         ppc_md.time_init = NULL;
 469         ppc_md.get_rtc_time = NULL;
 470         ppc_md.set_rtc_time = NULL;
 471         ppc_md.calibrate_decr = prpmc800_calibrate_decr;
 472 #ifdef  CONFIG_SERIAL_TEXT_DEBUG
 473         ppc_md.progress = gen550_progress;
 474 #else                           /* !CONFIG_SERIAL_TEXT_DEBUG */
 475         ppc_md.progress = NULL;
 476 #endif                          /* CONFIG_SERIAL_TEXT_DEBUG */
 477 }