arch/ppc/platforms/prpmc750.c

   1 /*
   2  * arch/ppc/platforms/prpmc750_setup.c
   3  *
   4  * Board setup routines for Motorola PrPMC750
   5  *
   6  * Author: Matt Porter <mporter@mvista.com>
   7  *
   8  * 2001-2003 (c) MontaVista, Software, Inc.  This file is licensed under
   9  * the terms of the GNU General Public License version 2.  This program
  10  * is licensed "as is" without any warranty of any kind, whether express
  11  * or implied.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/errno.h>
  19 #include <linux/reboot.h>
  20 #include <linux/pci.h>
  21 #include <linux/kdev_t.h>
  22 #include <linux/types.h>
  23 #include <linux/major.h>
  24 #include <linux/blk.h>
  25 #include <linux/console.h>
  26 #include <linux/delay.h>
  27 #include <linux/irq.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/ide.h>
  30
  31 #include <asm/system.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/page.h>
  34 #include <asm/dma.h>
  35 #include <asm/io.h>
  36 #include <asm/machdep.h>
  37 #include <asm/time.h>
  38 #include <platforms/prpmc750.h>
  39 #include <asm/open_pic.h>
  40 #include <asm/bootinfo.h>
  41 #include <asm/pplus.h>
  42
  43 #include "prpmc750_serial.h"
  44
  45 extern int mpic_init(void);
  46 extern unsigned long loops_per_jiffy;
  47 extern void gen550_progress(char *, unsigned short);
  48
  49 static u_char prpmc750_openpic_initsenses[] __initdata =
  50 {
  51         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT0 */
  52         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UART */
  53         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_DEBUGINT */
  54         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HAWK_WDT */
  55         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
  56         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_ABORT */
  57         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT1 */
  58         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT2 */
  59         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT3 */
  60         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTA */
  61         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTB */
  62         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTC */
  63         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTD */
  64         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
  65         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
  66         (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
  67 };
  68
  69 /*
  70  * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
  71  * Combined irq tables.  Only Base has IDSEL 14, only Carrier has 21 and 22.
  72  */
  73 static inline int
  74 prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  75 {
  76         static char pci_irq_table[][4] =
  77         /*
  78          *      PCI IDSEL/INTPIN->INTLINE
  79          *      A       B       C       D
  80          */
  81         {
  82                 {12,    0,      0,      0},  /* IDSEL 14 - Ethernet, base */
  83                 {0,     0,      0,      0},  /* IDSEL 15 - unused */
  84                 {10,    11,     12,     9},  /* IDSEL 16 - PMC A1, PMC1 */
  85                 {10,    11,     12,     9},  /* IDSEL 17 - PrPMC-A-B, PMC2-B */
  86                 {11,    12,     9,      10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
  87                 {0,     0,      0,      0},  /* IDSEL 19 - unused */
  88                 {9,     10,     11,     12}, /* IDSEL 20 - P2P Bridge */
  89                 {11,    12,     9,      10}, /* IDSEL 21 - PMC A2, carrier */
  90                 {12,    9,      10,     11}, /* IDSEL 22 - PMC A2-B, carrier */
  91         };
  92         const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
  93         return PCI_IRQ_TABLE_LOOKUP;
  94 };
  95
  96 static void __init
  97 prpmc750_pcibios_fixup(void)
  98 {
  99         struct pci_dev *dev;
 100         unsigned short wtmp;
 101
 102         /*
 103          * Kludge to clean up after PPC6BUG which doesn't
 104          * configure the CL5446 VGA card.  Also the
 105          * resource subsystem doesn't fixup the
 106          * PCI mem resources on the CL5446.
 107          */
 108         if ((dev = pci_find_device(PCI_VENDOR_ID_CIRRUS,
 109                                 PCI_DEVICE_ID_CIRRUS_5446, 0)))
 110         {
 111                 dev->resource[0].start += PRPMC750_PCI_PHY_MEM_BASE;
 112                 dev->resource[0].end += PRPMC750_PCI_PHY_MEM_BASE;
 113                 pci_read_config_word(dev,
 114                                 PCI_COMMAND,
 115                                 &wtmp);
 116                 pci_write_config_word(dev,
 117                                 PCI_COMMAND,
 118                                 wtmp|3);
 119                 /* Enable Color mode in MISC reg */
 120                 outb(0x03, 0x3c2);
 121                 /* Select DRAM config reg */
 122                 outb(0x0f, 0x3c4);
 123                 /* Set proper DRAM config */
 124                 outb(0xdf, 0x3c5);
 125         }
 126 }
 127
 128 static void __init
 129 prpmc750_find_bridges(void)
 130 {
 131         struct pci_controller* hose;
 132
 133         hose = pcibios_alloc_controller();
 134         if (!hose)
 135                 return;
 136
 137         hose->first_busno = 0;
 138         hose->last_busno = 0xff;
 139         hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_BASE;
 140
 141         pci_init_resource(&hose->io_resource,
 142                         PRPMC750_PCI_LOWER_IO,
 143                         PRPMC750_PCI_UPPER_IO,
 144                         IORESOURCE_IO,
 145                         "PCI host bridge");
 146
 147         pci_init_resource(&hose->mem_resources[0],
 148                         PRPMC750_PCI_LOWER_MEM + PRPMC750_PCI_PHY_MEM_BASE,
 149                         PRPMC750_PCI_UPPER_MEM + PRPMC750_PCI_PHY_MEM_BASE,
 150                         IORESOURCE_MEM,
 151                         "PCI host bridge");
 152
 153         hose->io_space.start = PRPMC750_PCI_LOWER_IO;
 154         hose->io_space.end = PRPMC750_PCI_UPPER_IO;
 155         hose->mem_space.start = PRPMC750_PCI_LOWER_MEM;
 156         hose->mem_space.end = PRPMC750_PCI_UPPER_MEM_AUTO;
 157
 158         hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
 159
 160         setup_indirect_pci(hose,
 161                         PRPMC750_PCI_CONFIG_ADDR,
 162                         PRPMC750_PCI_CONFIG_DATA);
 163
 164         /*
 165          * Disable MPIC response to PCI I/O space (BAR 0).
 166          * Make MPIC respond to PCI Mem space at specified address.
 167          * (BAR 1).
 168          */
 169         early_write_config_dword(hose,
 170                                  0,
 171                                  PCI_DEVFN(0,0),
 172                                  PCI_BASE_ADDRESS_0,
 173                                  0x00000000 | 0x1);
 174
 175         early_write_config_dword(hose,
 176                                  0,
 177                                  PCI_DEVFN(0,0),
 178                                  PCI_BASE_ADDRESS_1,
 179                                  (PRPMC750_HAWK_MPIC_BASE -
 180                                         PRPMC750_PCI_MEM_OFFSET) | 0x0);
 181
 182         hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 183
 184         ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
 185         ppc_md.pci_swizzle = common_swizzle;
 186         ppc_md.pci_map_irq = prpmc_map_irq;
 187 }
 188
 189 static int
 190 prpmc750_show_cpuinfo(struct seq_file *m)
 191 {
 192         seq_printf(m, "machine\t\t: PrPMC750\n");
 193
 194         return 0;
 195 }
 196
 197 static void __init
 198 prpmc750_setup_arch(void)
 199 {
 200         /* init to some ~sane value until calibrate_delay() runs */
 201         loops_per_jiffy = 50000000/HZ;
 202
 203         /* Lookup PCI host bridges */
 204         prpmc750_find_bridges();
 205
 206 #ifdef CONFIG_BLK_DEV_INITRD
 207         if (initrd_start)
 208                 ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0); /* /dev/ram */
 209         else
 210 #endif
 211 #ifdef CONFIG_ROOT_NFS
 212                 ROOT_DEV = to_kdev_t(0x00ff); /* /dev/nfs pseudo device */
 213 #else
 214                 ROOT_DEV = to_kdev_t(0x0802); /* /dev/sda2 */
 215 #endif
 216
 217 #ifdef CONFIG_DUMMY_CONSOLE
 218         conswitchp = &dummy_con;
 219 #endif
 220
 221         /* Find and map our OpenPIC */
 222         pplus_mpic_init(PRPMC750_PCI_MEM_OFFSET);
 223         OpenPIC_InitSenses = prpmc750_openpic_initsenses;
 224         OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);
 225 }
 226
 227 /*
 228  * Compute the PrPMC750's bus speed using the baud clock as a
 229  * reference.
 230  */
 231 static unsigned long __init
 232 prpmc750_get_bus_speed(void)
 233 {
 234         unsigned long tbl_start, tbl_end;
 235         unsigned long current_state, old_state, bus_speed;
 236         unsigned char lcr, dll, dlm;
 237         int baud_divisor, count;
 238
 239         /* Read the UART's baud clock divisor */
 240         lcr = readb(PRPMC750_SERIAL_0_LCR);
 241         writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 242         dll = readb(PRPMC750_SERIAL_0_DLL);
 243         dlm = readb(PRPMC750_SERIAL_0_DLM);
 244         writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 245         baud_divisor = (dlm << 8) | dll;
 246
 247         /*
 248          * Use the baud clock divisor and base baud clock
 249          * to determine the baud rate and use that as
 250          * the number of baud clock edges we use for
 251          * the time base sample.  Make it half the baud
 252          * rate.
 253          */
 254         count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
 255
 256         /* Find the first edge of the baud clock */
 257         old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
 258         do {
 259                 current_state = readb(PRPMC750_STATUS_REG) &
 260                         PRPMC750_BAUDOUT_MASK;
 261         } while(old_state == current_state);
 262
 263         old_state = current_state;
 264
 265         /* Get the starting time base value */
 266         tbl_start = get_tbl();
 267
 268         /*
 269          * Loop until we have found a number of edges equal
 270          * to half the count (half the baud rate)
 271          */
 272         do {
 273                 do {
 274                         current_state = readb(PRPMC750_STATUS_REG) &
 275                                 PRPMC750_BAUDOUT_MASK;
 276                 } while(old_state == current_state);
 277                 old_state = current_state;
 278         } while (--count);
 279
 280         /* Get the ending time base value */
 281         tbl_end = get_tbl();
 282
 283         /* Compute bus speed */
 284         bus_speed = (tbl_end-tbl_start)*128;
 285
 286         return bus_speed;
 287 }
 288
 289 static void __init
 290 prpmc750_calibrate_decr(void)
 291 {
 292         unsigned long freq;
 293         int divisor = 4;
 294
 295         freq = prpmc750_get_bus_speed();
 296
 297         tb_ticks_per_jiffy = freq / (HZ * divisor);
 298         tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
 299 }
 300
 301 static void
 302 prpmc750_restart(char *cmd)
 303 {
 304         __cli();
 305         writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
 306         while(1);
 307 }
 308
 309 static void
 310 prpmc750_halt(void)
 311 {
 312         __cli();
 313         while (1);
 314 }
 315
 316 static void
 317 prpmc750_power_off(void)
 318 {
 319         prpmc750_halt();
 320 }
 321
 322 static void __init
 323 prpmc750_init_IRQ(void)
 324 {
 325         openpic_init(0);
 326 }
 327
 328 /*
 329  * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 330  */
 331 static __inline__ void
 332 prpmc750_set_bat(void)
 333 {
 334         mb();
 335         mtspr(DBAT1U, 0xf0001ffe);
 336         mtspr(DBAT1L, 0xf000002a);
 337         mb();
 338 }
 339
 340 /*
 341  * We need to read the Falcon/Hawk memory controller
 342  * to properly determine this value
 343  */
 344 static unsigned long __init
 345 prpmc750_find_end_of_memory(void)
 346 {
 347         /* Read the memory size from the Hawk SMC */
 348         return pplus_get_mem_size(PRPMC750_HAWK_SMC_BASE);
 349 }
 350
 351 static void __init
 352 prpmc750_map_io(void)
 353 {
 354         io_block_mapping(0x80000000, 0x80000000, 0x10000000, _PAGE_IO);
 355         io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
 356         io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
 357 }
 358
 359 void __init
 360 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 361               unsigned long r6, unsigned long r7)
 362 {
 363         parse_bootinfo(find_bootinfo());
 364
 365         isa_io_base = PRPMC750_ISA_IO_BASE;
 366         isa_mem_base = PRPMC750_ISA_MEM_BASE;
 367         pci_dram_offset = PRPMC750_SYS_MEM_BASE;
 368
 369         prpmc750_set_bat();
 370
 371         ppc_md.setup_arch       = prpmc750_setup_arch;
 372         ppc_md.show_cpuinfo     = prpmc750_show_cpuinfo;
 373         ppc_md.init_IRQ         = prpmc750_init_IRQ;
 374         ppc_md.get_irq          = openpic_get_irq;
 375
 376         ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
 377         ppc_md.setup_io_mappings = prpmc750_map_io;
 378
 379         ppc_md.restart          = prpmc750_restart;
 380         ppc_md.power_off        = prpmc750_power_off;
 381         ppc_md.halt             = prpmc750_halt;
 382
 383         /* PrPMC750 has no timekeeper part */
 384         ppc_md.time_init        = NULL;
 385         ppc_md.get_rtc_time     = NULL;
 386         ppc_md.set_rtc_time     = NULL;
 387         ppc_md.calibrate_decr   = prpmc750_calibrate_decr;
 388
 389 #ifdef  CONFIG_SERIAL_TEXT_DEBUG
 390         ppc_md.progress = gen550_progress;
 391 #endif  /* CONFIG_SERIAL_TEXT_DEBUG */
 392 }