arch/ppc/platforms/prpmc750.c

   1 /*
   2  * Board setup routines for Motorola PrPMC750
   3  *
   4  * Author: Matt Porter <mporter@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/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/errno.h>
  16 #include <linux/reboot.h>
  17 #include <linux/pci.h>
  18 #include <linux/kdev_t.h>
  19 #include <linux/types.h>
  20 #include <linux/major.h>
  21 #include <linux/initrd.h>
  22 #include <linux/console.h>
  23 #include <linux/delay.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/root_dev.h>
  26 #include <linux/slab.h>
  27 #include <linux/serial_reg.h>
  28
  29 #include <asm/byteorder.h>
  30 #include <asm/system.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/page.h>
  33 #include <asm/dma.h>
  34 #include <asm/io.h>
  35 #include <asm/irq.h>
  36 #include <asm/machdep.h>
  37 #include <asm/pci-bridge.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/time.h>
  40 #include <asm/open_pic.h>
  41 #include <asm/bootinfo.h>
  42 #include <asm/hawk.h>
  43
  44 #include "prpmc750.h"
  45
  46 extern unsigned long loops_per_jiffy;
  47
  48 extern void gen550_progress(char *, unsigned short);
  49
  50 static u_char prpmc750_openpic_initsenses[] __initdata =
  51 {
  52     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT0 */
  53     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UART */
  54     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_DEBUGINT */
  55     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HAWK_WDT */
  56     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  57     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_ABORT */
  58     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT1 */
  59     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT2 */
  60     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT3 */
  61     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTA */
  62     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTB */
  63     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTC */
  64     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTD */
  65     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  66     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  67     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  68 };
  69
  70 /*
  71  * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
  72  * Combined irq tables.  Only Base has IDSEL 14, only Carrier has 21 and 22.
  73  */
  74 static inline int
  75 prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  76 {
  77         static char pci_irq_table[][4] =
  78         /*
  79          *      PCI IDSEL/INTPIN->INTLINE
  80          *      A       B       C       D
  81          */
  82         {
  83                 {12,    0,      0,      0},  /* IDSEL 14 - Ethernet, base */
  84                 {0,     0,      0,      0},  /* IDSEL 15 - unused */
  85                 {10,    11,     12,     9},  /* IDSEL 16 - PMC A1, PMC1 */
  86                 {10,    11,     12,     9},  /* IDSEL 17 - PrPMC-A-B, PMC2-B */
  87                 {11,    12,     9,      10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
  88                 {0,     0,      0,      0},  /* IDSEL 19 - unused */
  89                 {9,     10,     11,     12}, /* IDSEL 20 - P2P Bridge */
  90                 {11,    12,     9,      10}, /* IDSEL 21 - PMC A2, carrier */
  91                 {12,    9,      10,     11}, /* IDSEL 22 - PMC A2-B, carrier */
  92         };
  93         const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
  94         return PCI_IRQ_TABLE_LOOKUP;
  95 };
  96
  97 static void __init 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_get_device(PCI_VENDOR_ID_CIRRUS,
 109                                    PCI_DEVICE_ID_CIRRUS_5446, 0))) {
 110                 dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
 111                 dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
 112                 pci_read_config_word(dev, PCI_COMMAND, &wtmp);
 113                 pci_write_config_word(dev, PCI_COMMAND, wtmp | 3);
 114                 /* Enable Color mode in MISC reg */
 115                 outb(0x03, 0x3c2);
 116                 /* Select DRAM config reg */
 117                 outb(0x0f, 0x3c4);
 118                 /* Set proper DRAM config */
 119                 outb(0xdf, 0x3c5);
 120                 pci_dev_put(dev);
 121         }
 122 }
 123
 124 void __init prpmc750_find_bridges(void)
 125 {
 126         struct pci_controller *hose;
 127
 128         hose = pcibios_alloc_controller();
 129         if (!hose)
 130                 return;
 131
 132         hose->first_busno = 0;
 133         hose->last_busno = 0xff;
 134         hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
 135         hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;
 136
 137         pci_init_resource(&hose->io_resource,
 138                           PRPMC750_PCI_IO_START,
 139                           PRPMC750_PCI_IO_END,
 140                           IORESOURCE_IO, "PCI host bridge");
 141
 142         pci_init_resource(&hose->mem_resources[0],
 143                           PRPMC750_PROC_PCI_MEM_START,
 144                           PRPMC750_PROC_PCI_MEM_END,
 145                           IORESOURCE_MEM, "PCI host bridge");
 146
 147         hose->io_space.start = PRPMC750_PCI_IO_START;
 148         hose->io_space.end = PRPMC750_PCI_IO_END;
 149         hose->mem_space.start = PRPMC750_PCI_MEM_START;
 150         hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;
 151
 152         if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
 153                       PRPMC750_PROC_PCI_MEM_START,
 154                       PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
 155                       PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
 156                       PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
 157             != 0) {
 158                 printk(KERN_CRIT "Could not initialize host bridge\n");
 159         }
 160
 161         hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 162
 163         ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
 164         ppc_md.pci_swizzle = common_swizzle;
 165         ppc_md.pci_map_irq = prpmc_map_irq;
 166 }
 167 static int prpmc750_show_cpuinfo(struct seq_file *m)
 168 {
 169         seq_printf(m, "machine\t\t: PrPMC750\n");
 170
 171         return 0;
 172 }
 173
 174 static void __init prpmc750_setup_arch(void)
 175 {
 176         /* init to some ~sane value until calibrate_delay() runs */
 177         loops_per_jiffy = 50000000 / HZ;
 178
 179         /* Lookup PCI host bridges */
 180         prpmc750_find_bridges();
 181
 182 #ifdef CONFIG_BLK_DEV_INITRD
 183         if (initrd_start)
 184                 ROOT_DEV = Root_RAM0;
 185         else
 186 #endif
 187 #ifdef CONFIG_ROOT_NFS
 188                 ROOT_DEV = Root_NFS;
 189 #else
 190                 ROOT_DEV = Root_SDA2;
 191 #endif
 192
 193         OpenPIC_InitSenses = prpmc750_openpic_initsenses;
 194         OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);
 195
 196         printk(KERN_INFO "Port by MontaVista Software, Inc. "
 197                         "(source@mvista.com)\n");
 198 }
 199
 200 /*
 201  * Compute the PrPMC750's bus speed using the baud clock as a
 202  * reference.
 203  */
 204 static unsigned long __init prpmc750_get_bus_speed(void)
 205 {
 206         unsigned long tbl_start, tbl_end;
 207         unsigned long current_state, old_state, bus_speed;
 208         unsigned char lcr, dll, dlm;
 209         int baud_divisor, count;
 210
 211         /* Read the UART's baud clock divisor */
 212         lcr = readb(PRPMC750_SERIAL_0_LCR);
 213         writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 214         dll = readb(PRPMC750_SERIAL_0_DLL);
 215         dlm = readb(PRPMC750_SERIAL_0_DLM);
 216         writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 217         baud_divisor = (dlm << 8) | dll;
 218
 219         /*
 220          * Use the baud clock divisor and base baud clock
 221          * to determine the baud rate and use that as
 222          * the number of baud clock edges we use for
 223          * the time base sample.  Make it half the baud
 224          * rate.
 225          */
 226         count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
 227
 228         /* Find the first edge of the baud clock */
 229         old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
 230         do {
 231                 current_state = readb(PRPMC750_STATUS_REG) &
 232                     PRPMC750_BAUDOUT_MASK;
 233         } while (old_state == current_state);
 234
 235         old_state = current_state;
 236
 237         /* Get the starting time base value */
 238         tbl_start = get_tbl();
 239
 240         /*
 241          * Loop until we have found a number of edges equal
 242          * to half the count (half the baud rate)
 243          */
 244         do {
 245                 do {
 246                         current_state = readb(PRPMC750_STATUS_REG) &
 247                             PRPMC750_BAUDOUT_MASK;
 248                 } while (old_state == current_state);
 249                 old_state = current_state;
 250         } while (--count);
 251
 252         /* Get the ending time base value */
 253         tbl_end = get_tbl();
 254
 255         /* Compute bus speed */
 256         bus_speed = (tbl_end - tbl_start) * 128;
 257
 258         return bus_speed;
 259 }
 260
 261 static void __init prpmc750_calibrate_decr(void)
 262 {
 263         unsigned long freq;
 264         int divisor = 4;
 265
 266         freq = prpmc750_get_bus_speed();
 267
 268         tb_ticks_per_jiffy = freq / (HZ * divisor);
 269         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
 270 }
 271
 272 static void prpmc750_restart(char *cmd)
 273 {
 274         local_irq_disable();
 275         writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
 276         while (1) ;
 277 }
 278
 279 static void prpmc750_halt(void)
 280 {
 281         local_irq_disable();
 282         while (1) ;
 283 }
 284
 285 static void prpmc750_power_off(void)
 286 {
 287         prpmc750_halt();
 288 }
 289
 290 static void __init prpmc750_init_IRQ(void)
 291 {
 292         openpic_init(0);
 293 }
 294
 295 /*
 296  * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 297  */
 298 static __inline__ void prpmc750_set_bat(void)
 299 {
 300         mb();
 301         mtspr(SPRN_DBAT1U, 0xf0001ffe);
 302         mtspr(SPRN_DBAT1L, 0xf000002a);
 303         mb();
 304 }
 305
 306 /*
 307  * We need to read the Falcon/Hawk memory controller
 308  * to properly determine this value
 309  */
 310 static unsigned long __init prpmc750_find_end_of_memory(void)
 311 {
 312         /* Read the memory size from the Hawk SMC */
 313         return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
 314 }
 315
 316 static void __init prpmc750_map_io(void)
 317 {
 318         io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
 319                          0x10000000, _PAGE_IO);
 320 #if 0
 321         io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
 322 #endif
 323         io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
 324 }
 325
 326 void __init
 327 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 328               unsigned long r6, unsigned long r7)
 329 {
 330         parse_bootinfo(find_bootinfo());
 331
 332         /* Cover the Hawk registers with a BAT */
 333         prpmc750_set_bat();
 334
 335         isa_io_base = PRPMC750_ISA_IO_BASE;
 336         isa_mem_base = PRPMC750_ISA_MEM_BASE;
 337         pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;
 338
 339         ppc_md.setup_arch = prpmc750_setup_arch;
 340         ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
 341         ppc_md.init_IRQ = prpmc750_init_IRQ;
 342         ppc_md.get_irq = openpic_get_irq;
 343
 344         ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
 345         ppc_md.setup_io_mappings = prpmc750_map_io;
 346
 347         ppc_md.restart = prpmc750_restart;
 348         ppc_md.power_off = prpmc750_power_off;
 349         ppc_md.halt = prpmc750_halt;
 350
 351         /* PrPMC750 has no timekeeper part */
 352         ppc_md.time_init = NULL;
 353         ppc_md.get_rtc_time = NULL;
 354         ppc_md.set_rtc_time = NULL;
 355         ppc_md.calibrate_decr = prpmc750_calibrate_decr;
 356
 357 #ifdef  CONFIG_SERIAL_TEXT_DEBUG
 358         ppc_md.progress = gen550_progress;
 359 #endif                          /* CONFIG_SERIAL_TEXT_DEBUG */
 360 }