release/src-rt-6.x/linux/linux-2.6/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/ide.h>
  26 #include <linux/root_dev.h>
  27 #include <linux/slab.h>
  28 #include <linux/serial_reg.h>
  29
  30 #include <asm/byteorder.h>
  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/irq.h>
  37 #include <asm/machdep.h>
  38 #include <asm/pci-bridge.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/time.h>
  41 #include <asm/open_pic.h>
  42 #include <asm/bootinfo.h>
  43 #include <asm/hawk.h>
  44
  45 #include "prpmc750.h"
  46
  47 extern unsigned long loops_per_jiffy;
  48
  49 extern void gen550_progress(char *, unsigned short);
  50
  51 static u_char prpmc750_openpic_initsenses[] __initdata =
  52 {
  53     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT0 */
  54     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UART */
  55     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_DEBUGINT */
  56     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HAWK_WDT */
  57     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  58     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_ABORT */
  59     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT1 */
  60     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT2 */
  61     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT3 */
  62     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTA */
  63     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTB */
  64     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTC */
  65     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTD */
  66     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  67     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  68     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  69 };
  70
  71 /*
  72  * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
  73  * Combined irq tables.  Only Base has IDSEL 14, only Carrier has 21 and 22.
  74  */
  75 static inline int
  76 prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  77 {
  78         static char pci_irq_table[][4] =
  79         /*
  80          *      PCI IDSEL/INTPIN->INTLINE
  81          *      A       B       C       D
  82          */
  83         {
  84                 {12,    0,      0,      0},  /* IDSEL 14 - Ethernet, base */
  85                 {0,     0,      0,      0},  /* IDSEL 15 - unused */
  86                 {10,    11,     12,     9},  /* IDSEL 16 - PMC A1, PMC1 */
  87                 {10,    11,     12,     9},  /* IDSEL 17 - PrPMC-A-B, PMC2-B */
  88                 {11,    12,     9,      10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
  89                 {0,     0,      0,      0},  /* IDSEL 19 - unused */
  90                 {9,     10,     11,     12}, /* IDSEL 20 - P2P Bridge */
  91                 {11,    12,     9,      10}, /* IDSEL 21 - PMC A2, carrier */
  92                 {12,    9,      10,     11}, /* IDSEL 22 - PMC A2-B, carrier */
  93         };
  94         const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
  95         return PCI_IRQ_TABLE_LOOKUP;
  96 };
  97
  98 static void __init prpmc750_pcibios_fixup(void)
  99 {
 100         struct pci_dev *dev;
 101         unsigned short wtmp;
 102
 103         /*
 104          * Kludge to clean up after PPC6BUG which doesn't
 105          * configure the CL5446 VGA card.  Also the
 106          * resource subsystem doesn't fixup the
 107          * PCI mem resources on the CL5446.
 108          */
 109         if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS,
 110                                    PCI_DEVICE_ID_CIRRUS_5446, 0))) {
 111                 dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
 112                 dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
 113                 pci_read_config_word(dev, PCI_COMMAND, &wtmp);
 114                 pci_write_config_word(dev, PCI_COMMAND, wtmp | 3);
 115                 /* Enable Color mode in MISC reg */
 116                 outb(0x03, 0x3c2);
 117                 /* Select DRAM config reg */
 118                 outb(0x0f, 0x3c4);
 119                 /* Set proper DRAM config */
 120                 outb(0xdf, 0x3c5);
 121                 pci_dev_put(dev);
 122         }
 123 }
 124
 125 void __init prpmc750_find_bridges(void)
 126 {
 127         struct pci_controller *hose;
 128
 129         hose = pcibios_alloc_controller();
 130         if (!hose)
 131                 return;
 132
 133         hose->first_busno = 0;
 134         hose->last_busno = 0xff;
 135         hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
 136         hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;
 137
 138         pci_init_resource(&hose->io_resource,
 139                           PRPMC750_PCI_IO_START,
 140                           PRPMC750_PCI_IO_END,
 141                           IORESOURCE_IO, "PCI host bridge");
 142
 143         pci_init_resource(&hose->mem_resources[0],
 144                           PRPMC750_PROC_PCI_MEM_START,
 145                           PRPMC750_PROC_PCI_MEM_END,
 146                           IORESOURCE_MEM, "PCI host bridge");
 147
 148         hose->io_space.start = PRPMC750_PCI_IO_START;
 149         hose->io_space.end = PRPMC750_PCI_IO_END;
 150         hose->mem_space.start = PRPMC750_PCI_MEM_START;
 151         hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;
 152
 153         if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
 154                       PRPMC750_PROC_PCI_MEM_START,
 155                       PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
 156                       PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
 157                       PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
 158             != 0) {
 159                 printk(KERN_CRIT "Could not initialize host bridge\n");
 160         }
 161
 162         hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 163
 164         ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
 165         ppc_md.pci_swizzle = common_swizzle;
 166         ppc_md.pci_map_irq = prpmc_map_irq;
 167 }
 168 static int prpmc750_show_cpuinfo(struct seq_file *m)
 169 {
 170         seq_printf(m, "machine\t\t: PrPMC750\n");
 171
 172         return 0;
 173 }
 174
 175 static void __init prpmc750_setup_arch(void)
 176 {
 177         /* init to some ~sane value until calibrate_delay() runs */
 178         loops_per_jiffy = 50000000 / HZ;
 179
 180         /* Lookup PCI host bridges */
 181         prpmc750_find_bridges();
 182
 183 #ifdef CONFIG_BLK_DEV_INITRD
 184         if (initrd_start)
 185                 ROOT_DEV = Root_RAM0;
 186         else
 187 #endif
 188 #ifdef CONFIG_ROOT_NFS
 189                 ROOT_DEV = Root_NFS;
 190 #else
 191                 ROOT_DEV = Root_SDA2;
 192 #endif
 193
 194         OpenPIC_InitSenses = prpmc750_openpic_initsenses;
 195         OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);
 196
 197         printk(KERN_INFO "Port by MontaVista Software, Inc. "
 198                         "(source@mvista.com)\n");
 199 }
 200
 201 /*
 202  * Compute the PrPMC750's bus speed using the baud clock as a
 203  * reference.
 204  */
 205 static unsigned long __init prpmc750_get_bus_speed(void)
 206 {
 207         unsigned long tbl_start, tbl_end;
 208         unsigned long current_state, old_state, bus_speed;
 209         unsigned char lcr, dll, dlm;
 210         int baud_divisor, count;
 211
 212         /* Read the UART's baud clock divisor */
 213         lcr = readb(PRPMC750_SERIAL_0_LCR);
 214         writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 215         dll = readb(PRPMC750_SERIAL_0_DLL);
 216         dlm = readb(PRPMC750_SERIAL_0_DLM);
 217         writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 218         baud_divisor = (dlm << 8) | dll;
 219
 220         /*
 221          * Use the baud clock divisor and base baud clock
 222          * to determine the baud rate and use that as
 223          * the number of baud clock edges we use for
 224          * the time base sample.  Make it half the baud
 225          * rate.
 226          */
 227         count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
 228
 229         /* Find the first edge of the baud clock */
 230         old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
 231         do {
 232                 current_state = readb(PRPMC750_STATUS_REG) &
 233                     PRPMC750_BAUDOUT_MASK;
 234         } while (old_state == current_state);
 235
 236         old_state = current_state;
 237
 238         /* Get the starting time base value */
 239         tbl_start = get_tbl();
 240
 241         /*
 242          * Loop until we have found a number of edges equal
 243          * to half the count (half the baud rate)
 244          */
 245         do {
 246                 do {
 247                         current_state = readb(PRPMC750_STATUS_REG) &
 248                             PRPMC750_BAUDOUT_MASK;
 249                 } while (old_state == current_state);
 250                 old_state = current_state;
 251         } while (--count);
 252
 253         /* Get the ending time base value */
 254         tbl_end = get_tbl();
 255
 256         /* Compute bus speed */
 257         bus_speed = (tbl_end - tbl_start) * 128;
 258
 259         return bus_speed;
 260 }
 261
 262 static void __init prpmc750_calibrate_decr(void)
 263 {
 264         unsigned long freq;
 265         int divisor = 4;
 266
 267         freq = prpmc750_get_bus_speed();
 268
 269         tb_ticks_per_jiffy = freq / (HZ * divisor);
 270         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
 271 }
 272
 273 static void prpmc750_restart(char *cmd)
 274 {
 275         local_irq_disable();
 276         writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
 277         while (1) ;
 278 }
 279
 280 static void prpmc750_halt(void)
 281 {
 282         local_irq_disable();
 283         while (1) ;
 284 }
 285
 286 static void prpmc750_power_off(void)
 287 {
 288         prpmc750_halt();
 289 }
 290
 291 static void __init prpmc750_init_IRQ(void)
 292 {
 293         openpic_init(0);
 294 }
 295
 296 /*
 297  * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 298  */
 299 static __inline__ void prpmc750_set_bat(void)
 300 {
 301         mb();
 302         mtspr(SPRN_DBAT1U, 0xf0001ffe);
 303         mtspr(SPRN_DBAT1L, 0xf000002a);
 304         mb();
 305 }
 306
 307 /*
 308  * We need to read the Falcon/Hawk memory controller
 309  * to properly determine this value
 310  */
 311 static unsigned long __init prpmc750_find_end_of_memory(void)
 312 {
 313         /* Read the memory size from the Hawk SMC */
 314         return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
 315 }
 316
 317 static void __init prpmc750_map_io(void)
 318 {
 319         io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
 320                          0x10000000, _PAGE_IO);
 321 #if 0
 322         io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
 323 #endif
 324         io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
 325 }
 326
 327 void __init
 328 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 329               unsigned long r6, unsigned long r7)
 330 {
 331         parse_bootinfo(find_bootinfo());
 332
 333         /* Cover the Hawk registers with a BAT */
 334         prpmc750_set_bat();
 335
 336         isa_io_base = PRPMC750_ISA_IO_BASE;
 337         isa_mem_base = PRPMC750_ISA_MEM_BASE;
 338         pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;
 339
 340         ppc_md.setup_arch = prpmc750_setup_arch;
 341         ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
 342         ppc_md.init_IRQ = prpmc750_init_IRQ;
 343         ppc_md.get_irq = openpic_get_irq;
 344
 345         ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
 346         ppc_md.setup_io_mappings = prpmc750_map_io;
 347
 348         ppc_md.restart = prpmc750_restart;
 349         ppc_md.power_off = prpmc750_power_off;
 350         ppc_md.halt = prpmc750_halt;
 351
 352         /* PrPMC750 has no timekeeper part */
 353         ppc_md.time_init = NULL;
 354         ppc_md.get_rtc_time = NULL;
 355         ppc_md.set_rtc_time = NULL;
 356         ppc_md.calibrate_decr = prpmc750_calibrate_decr;
 357
 358 #ifdef  CONFIG_SERIAL_TEXT_DEBUG
 359         ppc_md.progress = gen550_progress;
 360 #endif                          /* CONFIG_SERIAL_TEXT_DEBUG */
 361 }