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/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/seq_file.h>
  26 #include <linux/ide.h>
  27 #include <linux/root_dev.h>
  28 #include <linux/slab.h>
  29 #include <linux/serial_reg.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/pci-bridge.h>
  40 #include <asm/uaccess.h>
  41 #include <asm/time.h>
  42 #include <asm/open_pic.h>
  43 #include <asm/bootinfo.h>
  44 #include <asm/hawk.h>
  45
  46 #include "prpmc750.h"
  47
  48 extern unsigned long loops_per_jiffy;
  49
  50 extern void gen550_progress(char *, unsigned short);
  51
  52 static u_char prpmc750_openpic_initsenses[] __initdata =
  53 {
  54     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT0 */
  55     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UART */
  56     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_DEBUGINT */
  57     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HAWK_WDT */
  58     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  59     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_ABORT */
  60     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT1 */
  61     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT2 */
  62     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT3 */
  63     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTA */
  64     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTB */
  65     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTC */
  66     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTD */
  67     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  68     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  69     (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
  70 };
  71
  72 /*
  73  * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
  74  * Combined irq tables.  Only Base has IDSEL 14, only Carrier has 21 and 22.
  75  */
  76 static inline int
  77 prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  78 {
  79         static char pci_irq_table[][4] =
  80         /*
  81          *      PCI IDSEL/INTPIN->INTLINE
  82          *      A       B       C       D
  83          */
  84         {
  85                 {12,    0,      0,      0},  /* IDSEL 14 - Ethernet, base */
  86                 {0,     0,      0,      0},  /* IDSEL 15 - unused */
  87                 {10,    11,     12,     9},  /* IDSEL 16 - PMC A1, PMC1 */
  88                 {10,    11,     12,     9},  /* IDSEL 17 - PrPMC-A-B, PMC2-B */
  89                 {11,    12,     9,      10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
  90                 {0,     0,      0,      0},  /* IDSEL 19 - unused */
  91                 {9,     10,     11,     12}, /* IDSEL 20 - P2P Bridge */
  92                 {11,    12,     9,      10}, /* IDSEL 21 - PMC A2, carrier */
  93                 {12,    9,      10,     11}, /* IDSEL 22 - PMC A2-B, carrier */
  94         };
  95         const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
  96         return PCI_IRQ_TABLE_LOOKUP;
  97 };
  98
  99 static void __init prpmc750_pcibios_fixup(void)
 100 {
 101         struct pci_dev *dev;
 102         unsigned short wtmp;
 103
 104         /*
 105          * Kludge to clean up after PPC6BUG which doesn't
 106          * configure the CL5446 VGA card.  Also the
 107          * resource subsystem doesn't fixup the
 108          * PCI mem resources on the CL5446.
 109          */
 110         if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS,
 111                                    PCI_DEVICE_ID_CIRRUS_5446, 0))) {
 112                 dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
 113                 dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
 114                 pci_read_config_word(dev, PCI_COMMAND, &wtmp);
 115                 pci_write_config_word(dev, PCI_COMMAND, wtmp | 3);
 116                 /* Enable Color mode in MISC reg */
 117                 outb(0x03, 0x3c2);
 118                 /* Select DRAM config reg */
 119                 outb(0x0f, 0x3c4);
 120                 /* Set proper DRAM config */
 121                 outb(0xdf, 0x3c5);
 122                 pci_dev_put(dev);
 123         }
 124 }
 125
 126 void __init prpmc750_find_bridges(void)
 127 {
 128         struct pci_controller *hose;
 129
 130         hose = pcibios_alloc_controller();
 131         if (!hose)
 132                 return;
 133
 134         hose->first_busno = 0;
 135         hose->last_busno = 0xff;
 136         hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
 137         hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;
 138
 139         pci_init_resource(&hose->io_resource,
 140                           PRPMC750_PCI_IO_START,
 141                           PRPMC750_PCI_IO_END,
 142                           IORESOURCE_IO, "PCI host bridge");
 143
 144         pci_init_resource(&hose->mem_resources[0],
 145                           PRPMC750_PROC_PCI_MEM_START,
 146                           PRPMC750_PROC_PCI_MEM_END,
 147                           IORESOURCE_MEM, "PCI host bridge");
 148
 149         hose->io_space.start = PRPMC750_PCI_IO_START;
 150         hose->io_space.end = PRPMC750_PCI_IO_END;
 151         hose->mem_space.start = PRPMC750_PCI_MEM_START;
 152         hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;
 153
 154         if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
 155                       PRPMC750_PROC_PCI_MEM_START,
 156                       PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
 157                       PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
 158                       PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
 159             != 0) {
 160                 printk(KERN_CRIT "Could not initialize host bridge\n");
 161         }
 162
 163         hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
 164
 165         ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
 166         ppc_md.pci_swizzle = common_swizzle;
 167         ppc_md.pci_map_irq = prpmc_map_irq;
 168 }
 169 static int prpmc750_show_cpuinfo(struct seq_file *m)
 170 {
 171         seq_printf(m, "machine\t\t: PrPMC750\n");
 172
 173         return 0;
 174 }
 175
 176 static void __init prpmc750_setup_arch(void)
 177 {
 178         /* init to some ~sane value until calibrate_delay() runs */
 179         loops_per_jiffy = 50000000 / HZ;
 180
 181         /* Lookup PCI host bridges */
 182         prpmc750_find_bridges();
 183
 184 #ifdef CONFIG_BLK_DEV_INITRD
 185         if (initrd_start)
 186                 ROOT_DEV = Root_RAM0;
 187         else
 188 #endif
 189 #ifdef CONFIG_ROOT_NFS
 190                 ROOT_DEV = Root_NFS;
 191 #else
 192                 ROOT_DEV = Root_SDA2;
 193 #endif
 194
 195         OpenPIC_InitSenses = prpmc750_openpic_initsenses;
 196         OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);
 197
 198         printk(KERN_INFO "Port by MontaVista Software, Inc. "
 199                         "(source@mvista.com)\n");
 200 }
 201
 202 /*
 203  * Compute the PrPMC750's bus speed using the baud clock as a
 204  * reference.
 205  */
 206 static unsigned long __init prpmc750_get_bus_speed(void)
 207 {
 208         unsigned long tbl_start, tbl_end;
 209         unsigned long current_state, old_state, bus_speed;
 210         unsigned char lcr, dll, dlm;
 211         int baud_divisor, count;
 212
 213         /* Read the UART's baud clock divisor */
 214         lcr = readb(PRPMC750_SERIAL_0_LCR);
 215         writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 216         dll = readb(PRPMC750_SERIAL_0_DLL);
 217         dlm = readb(PRPMC750_SERIAL_0_DLM);
 218         writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
 219         baud_divisor = (dlm << 8) | dll;
 220
 221         /*
 222          * Use the baud clock divisor and base baud clock
 223          * to determine the baud rate and use that as
 224          * the number of baud clock edges we use for
 225          * the time base sample.  Make it half the baud
 226          * rate.
 227          */
 228         count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
 229
 230         /* Find the first edge of the baud clock */
 231         old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
 232         do {
 233                 current_state = readb(PRPMC750_STATUS_REG) &
 234                     PRPMC750_BAUDOUT_MASK;
 235         } while (old_state == current_state);
 236
 237         old_state = current_state;
 238
 239         /* Get the starting time base value */
 240         tbl_start = get_tbl();
 241
 242         /*
 243          * Loop until we have found a number of edges equal
 244          * to half the count (half the baud rate)
 245          */
 246         do {
 247                 do {
 248                         current_state = readb(PRPMC750_STATUS_REG) &
 249                             PRPMC750_BAUDOUT_MASK;
 250                 } while (old_state == current_state);
 251                 old_state = current_state;
 252         } while (--count);
 253
 254         /* Get the ending time base value */
 255         tbl_end = get_tbl();
 256
 257         /* Compute bus speed */
 258         bus_speed = (tbl_end - tbl_start) * 128;
 259
 260         return bus_speed;
 261 }
 262
 263 static void __init prpmc750_calibrate_decr(void)
 264 {
 265         unsigned long freq;
 266         int divisor = 4;
 267
 268         freq = prpmc750_get_bus_speed();
 269
 270         tb_ticks_per_jiffy = freq / (HZ * divisor);
 271         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
 272 }
 273
 274 static void prpmc750_restart(char *cmd)
 275 {
 276         local_irq_disable();
 277         writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
 278         while (1) ;
 279 }
 280
 281 static void prpmc750_halt(void)
 282 {
 283         local_irq_disable();
 284         while (1) ;
 285 }
 286
 287 static void prpmc750_power_off(void)
 288 {
 289         prpmc750_halt();
 290 }
 291
 292 static void __init prpmc750_init_IRQ(void)
 293 {
 294         openpic_init(0);
 295 }
 296
 297 /*
 298  * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 299  */
 300 static __inline__ void prpmc750_set_bat(void)
 301 {
 302         mb();
 303         mtspr(SPRN_DBAT1U, 0xf0001ffe);
 304         mtspr(SPRN_DBAT1L, 0xf000002a);
 305         mb();
 306 }
 307
 308 /*
 309  * We need to read the Falcon/Hawk memory controller
 310  * to properly determine this value
 311  */
 312 static unsigned long __init prpmc750_find_end_of_memory(void)
 313 {
 314         /* Read the memory size from the Hawk SMC */
 315         return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
 316 }
 317
 318 static void __init prpmc750_map_io(void)
 319 {
 320         io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
 321                          0x10000000, _PAGE_IO);
 322 #if 0
 323         io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
 324 #endif
 325         io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
 326 }
 327
 328 void __init
 329 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 330               unsigned long r6, unsigned long r7)
 331 {
 332         parse_bootinfo(find_bootinfo());
 333
 334         /* Cover the Hawk registers with a BAT */
 335         prpmc750_set_bat();
 336
 337         isa_io_base = PRPMC750_ISA_IO_BASE;
 338         isa_mem_base = PRPMC750_ISA_MEM_BASE;
 339         pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;
 340
 341         ppc_md.setup_arch = prpmc750_setup_arch;
 342         ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
 343         ppc_md.init_IRQ = prpmc750_init_IRQ;
 344         ppc_md.get_irq = openpic_get_irq;
 345
 346         ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
 347         ppc_md.setup_io_mappings = prpmc750_map_io;
 348
 349         ppc_md.restart = prpmc750_restart;
 350         ppc_md.power_off = prpmc750_power_off;
 351         ppc_md.halt = prpmc750_halt;
 352
 353         /* PrPMC750 has no timekeeper part */
 354         ppc_md.time_init = NULL;
 355         ppc_md.get_rtc_time = NULL;
 356         ppc_md.set_rtc_time = NULL;
 357         ppc_md.calibrate_decr = prpmc750_calibrate_decr;
 358
 359 #ifdef  CONFIG_SERIAL_TEXT_DEBUG
 360         ppc_md.progress = gen550_progress;
 361 #endif                          /* CONFIG_SERIAL_TEXT_DEBUG */
 362 }