LXR linux/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
  47extern unsigned long loops_per_jiffy;
  48
  49extern void gen550_progress(char *, unsigned short);
  50
  51static 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 */
  75static inline int
  76prpmc_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
  98static 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
 125void __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}
 168static int prpmc750_show_cpuinfo(struct seq_file *m)
 169{
 170        seq_printf(m, "machine\t\t: PrPMC750\n");
 171
 172        return 0;
 173}
 174
 175static 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 */
 205static 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
 262static 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
 273static void prpmc750_restart(char *cmd)
 274{
 275        local_irq_disable();
 276        writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
 277        while (1) ;
 278}
 279
 280static void prpmc750_halt(void)
 281{
 282        local_irq_disable();
 283        while (1) ;
 284}
 285
 286static void prpmc750_power_off(void)
 287{
 288        prpmc750_halt();
 289}
 290
 291static 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 */
 299static __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 */
 311static 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
 317static 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
 327void __init
 328platform_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}
 362