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powerpmc250.c

/*
 * Board setup routines for Force PowerPMC-250 Processor PMC
 *
 * Author: Troy Benjegerdes <tbenjegerdes@mvista.com>
 * Borrowed heavily from prpmc750_*.c by
 *    Matt Porter <mporter@mvista.com>
 *
 * 2001 (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/slab.h>
#include <linux/seq_file.h>
#include <linux/ide.h>
#include <linux/root_dev.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/time.h>
#include <platforms/powerpmc250.h>
#include <asm/open_pic.h>
#include <asm/pci-bridge.h>
#include <asm/mpc10x.h>
#include <asm/uaccess.h>
#include <asm/bootinfo.h>

extern void powerpmc250_find_bridges(void);
extern unsigned long loops_per_jiffy;

static u_char powerpmc250_openpic_initsenses[] __initdata =
{
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    1,      /* PMC INTA (also MPC107 output interrupt INTA) */
    1,      /* PMC INTB (also I82559 Ethernet controller) */
    1,      /* PMC INTC */
    1,      /* PMC INTD */
    0,      /* DUART interrupt (active high) */
};

static int
powerpmc250_show_cpuinfo(struct seq_file *m)
{
      seq_printf(m,"machine\t\t: Force PowerPMC250\n");

      return 0;
}

static void __init
powerpmc250_setup_arch(void)
{
      /* init to some ~sane value until calibrate_delay() runs */
      loops_per_jiffy = 50000000/HZ;

      /* Lookup PCI host bridges */
      powerpmc250_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

      printk("Force PowerPMC250 port (C) 2001 MontaVista Software, Inc. (source@mvista.com)\n");
}

#if 0
/*
 * Compute the PrPMC750's bus speed using the baud clock as a
 * reference.
 */
unsigned long __init powerpmc250_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;
}
#endif

static void __init
powerpmc250_calibrate_decr(void)
{
      unsigned long freq;
      int divisor = 4;

      //freq = powerpmc250_get_bus_speed();
#warning hardcoded bus freq
      freq = 100000000;

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

static void
powerpmc250_restart(char *cmd)
{
      local_irq_disable();
      /* Hard reset */
      writeb(0x11, 0xfe000332);
      while(1);
}

static void
powerpmc250_halt(void)
{
      local_irq_disable();
      while (1);
}

static void
powerpmc250_power_off(void)
{
      powerpmc250_halt();
}

static void __init
powerpmc250_init_IRQ(void)
{

      OpenPIC_InitSenses = powerpmc250_openpic_initsenses;
      OpenPIC_NumInitSenses = sizeof(powerpmc250_openpic_initsenses);
      mpc10x_set_openpic();
}

/*
 * Set BAT 3 to map 0xf0000000 to end of physical memory space.
 */
static __inline__ void
powerpmc250_set_bat(void)
{
      unsigned long   bat3u, bat3l;
      static int  mapping_set = 0;

      if (!mapping_set)
      {
            __asm__ __volatile__(
                        " lis %0,0xf000\n \
                        ori %1,%0,0x002a\n \
                        ori %0,%0,0x1ffe\n \
                        mtspr 0x21e,%0\n \
                        mtspr 0x21f,%1\n \
                        isync\n \
                        sync "
                        : "=r" (bat3u), "=r" (bat3l));

            mapping_set = 1;
      }
      return;
}

static unsigned long __init
powerpmc250_find_end_of_memory(void)
{
      /* Cover I/O space with a BAT */
      /* yuck, better hope your ram size is a power of 2  -- paulus */
      powerpmc250_set_bat();

      return mpc10x_get_mem_size(MPC10X_MEM_MAP_B);
}

static void __init
powerpmc250_map_io(void)
{
      io_block_mapping(0xfe000000, 0xfe000000, 0x02000000, _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());

#ifdef CONFIG_BLK_DEV_INITRD
      if ( r4 )
      {
            initrd_start = r4 + KERNELBASE;
            initrd_end = r5 + KERNELBASE;
      }
#endif

      /* Copy cmd_line parameters */
      if ( r6)
      {
            *(char *)(r7 + KERNELBASE) = 0;
            strcpy(cmd_line, (char *)(r6 + KERNELBASE));
      }

      isa_io_base = MPC10X_MAPB_ISA_IO_BASE;
      isa_mem_base = MPC10X_MAPB_ISA_MEM_BASE;
      pci_dram_offset = MPC10X_MAPB_DRAM_OFFSET;

      ppc_md.setup_arch = powerpmc250_setup_arch;
      ppc_md.show_cpuinfo     = powerpmc250_show_cpuinfo;
      ppc_md.init_IRQ         = powerpmc250_init_IRQ;
      ppc_md.get_irq          = openpic_get_irq;

      ppc_md.find_end_of_memory = powerpmc250_find_end_of_memory;
      ppc_md.setup_io_mappings = powerpmc250_map_io;

      ppc_md.restart          = powerpmc250_restart;
      ppc_md.power_off  = powerpmc250_power_off;
      ppc_md.halt       = powerpmc250_halt;

      /* PowerPMC250 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   = powerpmc250_calibrate_decr;
}


/*
 * (This used to be arch/ppc/platforms/powerpmc250_pci.c)
 *
 * PCI support for Force PowerPMC250
 *
 */

#undef DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif /* DEBUG */

static inline int __init
powerpmc250_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
       */
      {
            {17,  0,    0,    0},   /* Device 11 - 82559 */
            {0,   0,    0,    0},   /* 12 */
            {0,   0,    0,    0},   /* 13 */
            {0,   0,    0,    0},   /* 14 */
            {0,   0,    0,    0},   /* 15 */
            {16,  17,   18,   19},  /* Device 16 - PMC A1?? */
            };
      const long min_idsel = 11, max_idsel = 16, irqs_per_slot = 4;
      return PCI_IRQ_TABLE_LOOKUP;
};

static int
powerpmc250_exclude_device(u_char bus, u_char devfn)
{
      /*
       * While doing PCI Scan  the MPC107 will 'detect' itself as
       * device on the PCI Bus, will create an incorrect response and
       * later will respond incorrectly to Configuration read coming
       * from another device.
       *
       * The work around is that when doing a PCI Scan one
       * should skip its own device number in the scan.
       *
       * The top IDsel is AD13 and the middle is AD14.
       *
       * -- Note from force
       */

      if ((bus == 0) && (PCI_SLOT(devfn) == 13 || PCI_SLOT(devfn) == 14)) {
            return PCIBIOS_DEVICE_NOT_FOUND;
      }
      else {
            return PCIBIOS_SUCCESSFUL;
      }
}

void __init
powerpmc250_find_bridges(void)
{
      struct pci_controller* hose;

      hose = pcibios_alloc_controller();
      if (!hose){
            printk("Can't allocate PCI 'hose' structure!!!\n");
            return;
      }

      hose->first_busno = 0;
      hose->last_busno = 0xff;

      if (mpc10x_bridge_init(hose,
                  MPC10X_MEM_MAP_B,
                  MPC10X_MEM_MAP_B,
                  MPC10X_MAPB_EUMB_BASE) == 0) {

            hose->mem_resources[0].end = 0xffffffff;

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

            /* ppc_md.pcibios_fixup = pcore_pcibios_fixup; */
            ppc_md.pci_swizzle = common_swizzle;

            ppc_md.pci_exclude_device = powerpmc250_exclude_device;
            ppc_md.pci_map_irq = powerpmc250_map_irq;
      } else {
            if (ppc_md.progress)
                  ppc_md.progress("Bridge init failed", 0x100);
            printk("Host bridge init failed\n");
      }

}

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