Logo Search packages:      
Sourcecode: linux version File versions  Download package

prpmc750.c

/*
 * Board setup routines for Motorola PrPMC750
 *
 * Author: Matt Porter <mporter@mvista.com>
 *
 * 2001-2004 (c) MontaVista, Software, Inc.  This file is licensed under
 * the terms of the GNU General Public License version 2.  This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/reboot.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/types.h>
#include <linux/major.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/seq_file.h>
#include <linux/ide.h>
#include <linux/root_dev.h>
#include <linux/slab.h>
#include <linux/serial_reg.h>

#include <asm/byteorder.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/pci-bridge.h>
#include <asm/uaccess.h>
#include <asm/time.h>
#include <asm/open_pic.h>
#include <asm/bootinfo.h>
#include <asm/hawk.h>

#include "prpmc750.h"

extern unsigned long loops_per_jiffy;

extern void gen550_progress(char *, unsigned short);

static u_char prpmc750_openpic_initsenses[] __initdata =
{
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT0 */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UART */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_DEBUGINT */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HAWK_WDT */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_ABORT */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT1 */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT2 */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_HOSTINT3 */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTA */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTB */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTC */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_PMC_INTD */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
    (IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),  /* PRPMC750_INT_UNUSED */
};

/*
 * Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
 * Combined irq tables.  Only Base has IDSEL 14, only Carrier has 21 and 22.
 */
static inline int
prpmc_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
{
      static char pci_irq_table[][4] =
      /*
       *      PCI IDSEL/INTPIN->INTLINE
       *      A       B       C       D
       */
      {
            {12,  0,    0,    0},  /* IDSEL 14 - Ethernet, base */
            {0,   0,    0,    0},  /* IDSEL 15 - unused */
            {10,  11,   12,   9},  /* IDSEL 16 - PMC A1, PMC1 */
            {10,  11,   12,   9},  /* IDSEL 17 - PrPMC-A-B, PMC2-B */
            {11,  12,   9,    10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
            {0,   0,    0,    0},  /* IDSEL 19 - unused */
            {9,   10,   11,   12}, /* IDSEL 20 - P2P Bridge */
            {11,  12,   9,    10}, /* IDSEL 21 - PMC A2, carrier */
            {12,  9,    10,   11}, /* IDSEL 22 - PMC A2-B, carrier */
      };
      const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
      return PCI_IRQ_TABLE_LOOKUP;
};

static void __init prpmc750_pcibios_fixup(void)
{
      struct pci_dev *dev;
      unsigned short wtmp;

      /*
       * Kludge to clean up after PPC6BUG which doesn't
       * configure the CL5446 VGA card.  Also the
       * resource subsystem doesn't fixup the
       * PCI mem resources on the CL5446.
       */
      if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS,
                           PCI_DEVICE_ID_CIRRUS_5446, 0))) {
            dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
            dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
            pci_read_config_word(dev, PCI_COMMAND, &wtmp);
            pci_write_config_word(dev, PCI_COMMAND, wtmp | 3);
            /* Enable Color mode in MISC reg */
            outb(0x03, 0x3c2);
            /* Select DRAM config reg */
            outb(0x0f, 0x3c4);
            /* Set proper DRAM config */
            outb(0xdf, 0x3c5);
            pci_dev_put(dev);
      }
}

void __init prpmc750_find_bridges(void)
{
      struct pci_controller *hose;

      hose = pcibios_alloc_controller();
      if (!hose)
            return;

      hose->first_busno = 0;
      hose->last_busno = 0xff;
      hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
      hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;

      pci_init_resource(&hose->io_resource,
                    PRPMC750_PCI_IO_START,
                    PRPMC750_PCI_IO_END,
                    IORESOURCE_IO, "PCI host bridge");

      pci_init_resource(&hose->mem_resources[0],
                    PRPMC750_PROC_PCI_MEM_START,
                    PRPMC750_PROC_PCI_MEM_END,
                    IORESOURCE_MEM, "PCI host bridge");

      hose->io_space.start = PRPMC750_PCI_IO_START;
      hose->io_space.end = PRPMC750_PCI_IO_END;
      hose->mem_space.start = PRPMC750_PCI_MEM_START;
      hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;

      if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
                  PRPMC750_PROC_PCI_MEM_START,
                  PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
                  PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
                  PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
          != 0) {
            printk(KERN_CRIT "Could not initialize host bridge\n");
      }

      hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);

      ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
      ppc_md.pci_swizzle = common_swizzle;
      ppc_md.pci_map_irq = prpmc_map_irq;
}
static int prpmc750_show_cpuinfo(struct seq_file *m)
{
      seq_printf(m, "machine\t\t: PrPMC750\n");

      return 0;
}

static void __init prpmc750_setup_arch(void)
{
      /* init to some ~sane value until calibrate_delay() runs */
      loops_per_jiffy = 50000000 / HZ;

      /* Lookup PCI host bridges */
      prpmc750_find_bridges();

#ifdef CONFIG_BLK_DEV_INITRD
      if (initrd_start)
            ROOT_DEV = Root_RAM0;
      else
#endif
#ifdef CONFIG_ROOT_NFS
            ROOT_DEV = Root_NFS;
#else
            ROOT_DEV = Root_SDA2;
#endif

      OpenPIC_InitSenses = prpmc750_openpic_initsenses;
      OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);

      printk(KERN_INFO "Port by MontaVista Software, Inc. "
                  "(source@mvista.com)\n");
}

/*
 * Compute the PrPMC750's bus speed using the baud clock as a
 * reference.
 */
static unsigned long __init prpmc750_get_bus_speed(void)
{
      unsigned long tbl_start, tbl_end;
      unsigned long current_state, old_state, bus_speed;
      unsigned char lcr, dll, dlm;
      int baud_divisor, count;

      /* Read the UART's baud clock divisor */
      lcr = readb(PRPMC750_SERIAL_0_LCR);
      writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
      dll = readb(PRPMC750_SERIAL_0_DLL);
      dlm = readb(PRPMC750_SERIAL_0_DLM);
      writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
      baud_divisor = (dlm << 8) | dll;

      /*
       * Use the baud clock divisor and base baud clock
       * to determine the baud rate and use that as
       * the number of baud clock edges we use for
       * the time base sample.  Make it half the baud
       * rate.
       */
      count = PRPMC750_BASE_BAUD / (baud_divisor * 16);

      /* Find the first edge of the baud clock */
      old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
      do {
            current_state = readb(PRPMC750_STATUS_REG) &
                PRPMC750_BAUDOUT_MASK;
      } while (old_state == current_state);

      old_state = current_state;

      /* Get the starting time base value */
      tbl_start = get_tbl();

      /*
       * Loop until we have found a number of edges equal
       * to half the count (half the baud rate)
       */
      do {
            do {
                  current_state = readb(PRPMC750_STATUS_REG) &
                      PRPMC750_BAUDOUT_MASK;
            } while (old_state == current_state);
            old_state = current_state;
      } while (--count);

      /* Get the ending time base value */
      tbl_end = get_tbl();

      /* Compute bus speed */
      bus_speed = (tbl_end - tbl_start) * 128;

      return bus_speed;
}

static void __init prpmc750_calibrate_decr(void)
{
      unsigned long freq;
      int divisor = 4;

      freq = prpmc750_get_bus_speed();

      tb_ticks_per_jiffy = freq / (HZ * divisor);
      tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
}

static void prpmc750_restart(char *cmd)
{
      local_irq_disable();
      writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
      while (1) ;
}

static void prpmc750_halt(void)
{
      local_irq_disable();
      while (1) ;
}

static void prpmc750_power_off(void)
{
      prpmc750_halt();
}

static void __init prpmc750_init_IRQ(void)
{
      openpic_init(0);
}

/*
 * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 */
static __inline__ void prpmc750_set_bat(void)
{
      mb();
      mtspr(SPRN_DBAT1U, 0xf0001ffe);
      mtspr(SPRN_DBAT1L, 0xf000002a);
      mb();
}

/*
 * We need to read the Falcon/Hawk memory controller
 * to properly determine this value
 */
static unsigned long __init prpmc750_find_end_of_memory(void)
{
      /* Read the memory size from the Hawk SMC */
      return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
}

static void __init prpmc750_map_io(void)
{
      io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
                   0x10000000, _PAGE_IO);
#if 0
      io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
#endif
      io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _PAGE_IO);
}

void __init
platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
            unsigned long r6, unsigned long r7)
{
      parse_bootinfo(find_bootinfo());

      /* Cover the Hawk registers with a BAT */
      prpmc750_set_bat();

      isa_io_base = PRPMC750_ISA_IO_BASE;
      isa_mem_base = PRPMC750_ISA_MEM_BASE;
      pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;

      ppc_md.setup_arch = prpmc750_setup_arch;
      ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
      ppc_md.init_IRQ = prpmc750_init_IRQ;
      ppc_md.get_irq = openpic_get_irq;

      ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
      ppc_md.setup_io_mappings = prpmc750_map_io;

      ppc_md.restart = prpmc750_restart;
      ppc_md.power_off = prpmc750_power_off;
      ppc_md.halt = prpmc750_halt;

      /* PrPMC750 has no timekeeper part */
      ppc_md.time_init = NULL;
      ppc_md.get_rtc_time = NULL;
      ppc_md.set_rtc_time = NULL;
      ppc_md.calibrate_decr = prpmc750_calibrate_decr;

#ifdef  CONFIG_SERIAL_TEXT_DEBUG
      ppc_md.progress = gen550_progress;
#endif                        /* CONFIG_SERIAL_TEXT_DEBUG */
}

Generated by  Doxygen 1.6.0   Back to index