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setup.c

/*
 * linux/arch/mips/txx9/generic/setup.c
 *
 * Based on linux/arch/mips/txx9/rbtx4938/setup.c,
 *        and RBTX49xx patch from CELF patch archive.
 *
 * 2003-2005 (c) MontaVista Software, Inc.
 * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/serial_core.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include <asm/reboot.h>
#include <asm/txx9/generic.h>
#include <asm/txx9/pci.h>
#ifdef CONFIG_CPU_TX49XX
#include <asm/txx9/tx4938.h>
#endif

/* EBUSC settings of TX4927, etc. */
struct resource txx9_ce_res[8];
static char txx9_ce_res_name[8][4]; /* "CEn" */

/* pcode, internal register */
unsigned int txx9_pcode;
char txx9_pcode_str[8];
static struct resource txx9_reg_res = {
      .name = txx9_pcode_str,
      .flags = IORESOURCE_MEM,
};
void __init
txx9_reg_res_init(unsigned int pcode, unsigned long base, unsigned long size)
{
      int i;

      for (i = 0; i < ARRAY_SIZE(txx9_ce_res); i++) {
            sprintf(txx9_ce_res_name[i], "CE%d", i);
            txx9_ce_res[i].flags = IORESOURCE_MEM;
            txx9_ce_res[i].name = txx9_ce_res_name[i];
      }

      txx9_pcode = pcode;
      sprintf(txx9_pcode_str, "TX%x", pcode);
      if (base) {
            txx9_reg_res.start = base & 0xfffffffffULL;
            txx9_reg_res.end = (base & 0xfffffffffULL) + (size - 1);
            request_resource(&iomem_resource, &txx9_reg_res);
      }
}

/* clocks */
unsigned int txx9_master_clock;
unsigned int txx9_cpu_clock;
unsigned int txx9_gbus_clock;

int txx9_ccfg_toeon __initdata = 1;

/* Minimum CLK support */

struct clk *clk_get(struct device *dev, const char *id)
{
      if (!strcmp(id, "spi-baseclk"))
            return (struct clk *)((unsigned long)txx9_gbus_clock / 2 / 4);
      if (!strcmp(id, "imbus_clk"))
            return (struct clk *)((unsigned long)txx9_gbus_clock / 2);
      return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(clk_get);

int clk_enable(struct clk *clk)
{
      return 0;
}
EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)
{
}
EXPORT_SYMBOL(clk_disable);

unsigned long clk_get_rate(struct clk *clk)
{
      return (unsigned long)clk;
}
EXPORT_SYMBOL(clk_get_rate);

void clk_put(struct clk *clk)
{
}
EXPORT_SYMBOL(clk_put);

/* GPIO support */

#ifdef CONFIG_GENERIC_GPIO
int gpio_to_irq(unsigned gpio)
{
      return -EINVAL;
}
EXPORT_SYMBOL(gpio_to_irq);

int irq_to_gpio(unsigned irq)
{
      return -EINVAL;
}
EXPORT_SYMBOL(irq_to_gpio);
#endif

extern struct txx9_board_vec jmr3927_vec;
extern struct txx9_board_vec rbtx4927_vec;
extern struct txx9_board_vec rbtx4937_vec;
extern struct txx9_board_vec rbtx4938_vec;

struct txx9_board_vec *txx9_board_vec __initdata;
static char txx9_system_type[32];

void __init prom_init_cmdline(void)
{
      int argc = (int)fw_arg0;
      char **argv = (char **)fw_arg1;
      int i;                  /* Always ignore the "-c" at argv[0] */
#ifdef CONFIG_64BIT
      char *fixed_argv[32];
      for (i = 0; i < argc; i++)
            fixed_argv[i] = (char *)(long)(*((__s32 *)argv + i));
      argv = fixed_argv;
#endif

      /* ignore all built-in args if any f/w args given */
      if (argc > 1)
            *arcs_cmdline = '\0';

      for (i = 1; i < argc; i++) {
            if (i != 1)
                  strcat(arcs_cmdline, " ");
            strcat(arcs_cmdline, argv[i]);
      }
}

void __init prom_init(void)
{
#ifdef CONFIG_CPU_TX39XX
      txx9_board_vec = &jmr3927_vec;
#endif
#ifdef CONFIG_CPU_TX49XX
      switch (TX4938_REV_PCODE()) {
#ifdef CONFIG_TOSHIBA_RBTX4927
      case 0x4927:
            txx9_board_vec = &rbtx4927_vec;
            break;
      case 0x4937:
            txx9_board_vec = &rbtx4937_vec;
            break;
#endif
#ifdef CONFIG_TOSHIBA_RBTX4938
      case 0x4938:
            txx9_board_vec = &rbtx4938_vec;
            break;
#endif
      }
#endif

      strcpy(txx9_system_type, txx9_board_vec->system);

      txx9_board_vec->prom_init();
}

void __init prom_free_prom_memory(void)
{
}

const char *get_system_type(void)
{
      return txx9_system_type;
}

char * __init prom_getcmdline(void)
{
      return &(arcs_cmdline[0]);
}

static void __noreturn txx9_machine_halt(void)
{
      local_irq_disable();
      clear_c0_status(ST0_IM);
      while (1) {
            if (cpu_wait) {
                  (*cpu_wait)();
                  if (cpu_has_counter) {
                        /*
                         * Clear counter interrupt while it
                         * breaks WAIT instruction even if
                         * masked.
                         */
                        write_c0_compare(0);
                  }
            }
      }
}

/* Watchdog support */
void __init txx9_wdt_init(unsigned long base)
{
      struct resource res = {
            .start      = base,
            .end  = base + 0x100 - 1,
            .flags      = IORESOURCE_MEM,
      };
      platform_device_register_simple("txx9wdt", -1, &res, 1);
}

/* SPI support */
void __init txx9_spi_init(int busid, unsigned long base, int irq)
{
      struct resource res[] = {
            {
                  .start      = base,
                  .end  = base + 0x20 - 1,
                  .flags      = IORESOURCE_MEM,
            }, {
                  .start      = irq,
                  .flags      = IORESOURCE_IRQ,
            },
      };
      platform_device_register_simple("spi_txx9", busid,
                              res, ARRAY_SIZE(res));
}

void __init txx9_ethaddr_init(unsigned int id, unsigned char *ethaddr)
{
      struct platform_device *pdev =
            platform_device_alloc("tc35815-mac", id);
      if (!pdev ||
          platform_device_add_data(pdev, ethaddr, 6) ||
          platform_device_add(pdev))
            platform_device_put(pdev);
}

void __init txx9_sio_init(unsigned long baseaddr, int irq,
                    unsigned int line, unsigned int sclk, int nocts)
{
#ifdef CONFIG_SERIAL_TXX9
      struct uart_port req;

      memset(&req, 0, sizeof(req));
      req.line = line;
      req.iotype = UPIO_MEM;
      req.membase = ioremap(baseaddr, 0x24);
      req.mapbase = baseaddr;
      req.irq = irq;
      if (!nocts)
            req.flags |= UPF_BUGGY_UART /*HAVE_CTS_LINE*/;
      if (sclk) {
            req.flags |= UPF_MAGIC_MULTIPLIER /*USE_SCLK*/;
            req.uartclk = sclk;
      } else
            req.uartclk = TXX9_IMCLK;
      early_serial_txx9_setup(&req);
#endif /* CONFIG_SERIAL_TXX9 */
}

#ifdef CONFIG_EARLY_PRINTK
static void __init null_prom_putchar(char c)
{
}
void (*txx9_prom_putchar)(char c) __initdata = null_prom_putchar;

void __init prom_putchar(char c)
{
      txx9_prom_putchar(c);
}

static void __iomem *early_txx9_sio_port;

static void __init early_txx9_sio_putchar(char c)
{
#define TXX9_SICISR     0x0c
#define TXX9_SITFIFO    0x1c
#define TXX9_SICISR_TXALS     0x00000002
      while (!(__raw_readl(early_txx9_sio_port + TXX9_SICISR) &
             TXX9_SICISR_TXALS))
            ;
      __raw_writel(c, early_txx9_sio_port + TXX9_SITFIFO);
}

void __init txx9_sio_putchar_init(unsigned long baseaddr)
{
      early_txx9_sio_port = ioremap(baseaddr, 0x24);
      txx9_prom_putchar = early_txx9_sio_putchar;
}
#endif /* CONFIG_EARLY_PRINTK */

/* wrappers */
void __init plat_mem_setup(void)
{
      ioport_resource.start = 0;
      ioport_resource.end = ~0UL;   /* no limit */
      iomem_resource.start = 0;
      iomem_resource.end = ~0UL;    /* no limit */

      /* fallback restart/halt routines */
      _machine_restart = (void (*)(char *))txx9_machine_halt;
      _machine_halt = txx9_machine_halt;
      pm_power_off = txx9_machine_halt;

#ifdef CONFIG_PCI
      pcibios_plat_setup = txx9_pcibios_setup;
#endif
      txx9_board_vec->mem_setup();
}

void __init arch_init_irq(void)
{
      txx9_board_vec->irq_setup();
}

void __init plat_time_init(void)
{
#ifdef CONFIG_CPU_TX49XX
      mips_hpt_frequency = txx9_cpu_clock / 2;
#endif
      txx9_board_vec->time_init();
}

static int __init _txx9_arch_init(void)
{
      if (txx9_board_vec->arch_init)
            txx9_board_vec->arch_init();
      return 0;
}
arch_initcall(_txx9_arch_init);

static int __init _txx9_device_init(void)
{
      if (txx9_board_vec->device_init)
            txx9_board_vec->device_init();
      return 0;
}
device_initcall(_txx9_device_init);

int (*txx9_irq_dispatch)(int pending);
asmlinkage void plat_irq_dispatch(void)
{
      int pending = read_c0_status() & read_c0_cause() & ST0_IM;
      int irq = txx9_irq_dispatch(pending);

      if (likely(irq >= 0))
            do_IRQ(irq);
      else
            spurious_interrupt();
}

/* see include/asm-mips/mach-tx39xx/mangle-port.h, for example. */
#ifdef NEEDS_TXX9_SWIZZLE_ADDR_B
static unsigned long __swizzle_addr_none(unsigned long port)
{
      return port;
}
unsigned long (*__swizzle_addr_b)(unsigned long port) = __swizzle_addr_none;
EXPORT_SYMBOL(__swizzle_addr_b);
#endif

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