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core.c

/*
 *  linux/arch/arm/mach-clps7500/core.c
 *
 *  Copyright (C) 1998 Russell King
 *  Copyright (C) 1999 Nexus Electronics Ltd
 *
 * Extra MM routines for CL7500 architecture
 */
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/serial_8250.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>

#include <asm/hardware.h>
#include <asm/hardware/iomd.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach-types.h>

unsigned int vram_size;

static void cl7500_ack_irq_a(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << irq;
      val = iomd_readb(IOMD_IRQMASKA);
      iomd_writeb(val & ~mask, IOMD_IRQMASKA);
      iomd_writeb(mask, IOMD_IRQCLRA);
}

static void cl7500_mask_irq_a(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << irq;
      val = iomd_readb(IOMD_IRQMASKA);
      iomd_writeb(val & ~mask, IOMD_IRQMASKA);
}

static void cl7500_unmask_irq_a(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << irq;
      val = iomd_readb(IOMD_IRQMASKA);
      iomd_writeb(val | mask, IOMD_IRQMASKA);
}

static struct irq_chip clps7500_a_chip = {
      .ack  = cl7500_ack_irq_a,
      .mask = cl7500_mask_irq_a,
      .unmask     = cl7500_unmask_irq_a,
};

static void cl7500_mask_irq_b(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_IRQMASKB);
      iomd_writeb(val & ~mask, IOMD_IRQMASKB);
}

static void cl7500_unmask_irq_b(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_IRQMASKB);
      iomd_writeb(val | mask, IOMD_IRQMASKB);
}

static struct irq_chip clps7500_b_chip = {
      .ack  = cl7500_mask_irq_b,
      .mask = cl7500_mask_irq_b,
      .unmask     = cl7500_unmask_irq_b,
};

static void cl7500_mask_irq_c(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_IRQMASKC);
      iomd_writeb(val & ~mask, IOMD_IRQMASKC);
}

static void cl7500_unmask_irq_c(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_IRQMASKC);
      iomd_writeb(val | mask, IOMD_IRQMASKC);
}

static struct irq_chip clps7500_c_chip = {
      .ack  = cl7500_mask_irq_c,
      .mask = cl7500_mask_irq_c,
      .unmask     = cl7500_unmask_irq_c,
};

static void cl7500_mask_irq_d(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_IRQMASKD);
      iomd_writeb(val & ~mask, IOMD_IRQMASKD);
}

static void cl7500_unmask_irq_d(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_IRQMASKD);
      iomd_writeb(val | mask, IOMD_IRQMASKD);
}

static struct irq_chip clps7500_d_chip = {
      .ack  = cl7500_mask_irq_d,
      .mask = cl7500_mask_irq_d,
      .unmask     = cl7500_unmask_irq_d,
};

static void cl7500_mask_irq_dma(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_DMAMASK);
      iomd_writeb(val & ~mask, IOMD_DMAMASK);
}

static void cl7500_unmask_irq_dma(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_DMAMASK);
      iomd_writeb(val | mask, IOMD_DMAMASK);
}

static struct irq_chip clps7500_dma_chip = {
      .ack  = cl7500_mask_irq_dma,
      .mask = cl7500_mask_irq_dma,
      .unmask     = cl7500_unmask_irq_dma,
};

static void cl7500_mask_irq_fiq(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_FIQMASK);
      iomd_writeb(val & ~mask, IOMD_FIQMASK);
}

static void cl7500_unmask_irq_fiq(unsigned int irq)
{
      unsigned int val, mask;

      mask = 1 << (irq & 7);
      val = iomd_readb(IOMD_FIQMASK);
      iomd_writeb(val | mask, IOMD_FIQMASK);
}

static struct irq_chip clps7500_fiq_chip = {
      .ack  = cl7500_mask_irq_fiq,
      .mask = cl7500_mask_irq_fiq,
      .unmask     = cl7500_unmask_irq_fiq,
};

static void cl7500_no_action(unsigned int irq)
{
}

static struct irq_chip clps7500_no_chip = {
      .ack  = cl7500_no_action,
      .mask = cl7500_no_action,
      .unmask     = cl7500_no_action,
};

static struct irqaction irq_isa = {
      .handler = no_action,
      .mask = CPU_MASK_NONE,
      .name = "isa",
};

static void __init clps7500_init_irq(void)
{
      unsigned int irq, flags;

      iomd_writeb(0, IOMD_IRQMASKA);
      iomd_writeb(0, IOMD_IRQMASKB);
      iomd_writeb(0, IOMD_FIQMASK);
      iomd_writeb(0, IOMD_DMAMASK);

      for (irq = 0; irq < NR_IRQS; irq++) {
            flags = IRQF_VALID;

            if (irq <= 6 || (irq >= 9 && irq <= 15) ||
                (irq >= 48 && irq <= 55))
                  flags |= IRQF_PROBE;

            switch (irq) {
            case 0 ... 7:
                  set_irq_chip(irq, &clps7500_a_chip);
                  set_irq_handler(irq, handle_level_irq);
                  set_irq_flags(irq, flags);
                  break;

            case 8 ... 15:
                  set_irq_chip(irq, &clps7500_b_chip);
                  set_irq_handler(irq, handle_level_irq);
                  set_irq_flags(irq, flags);
                  break;

            case 16 ... 22:
                  set_irq_chip(irq, &clps7500_dma_chip);
                  set_irq_handler(irq, handle_level_irq);
                  set_irq_flags(irq, flags);
                  break;

            case 24 ... 31:
                  set_irq_chip(irq, &clps7500_c_chip);
                  set_irq_handler(irq, handle_level_irq);
                  set_irq_flags(irq, flags);
                  break;

            case 40 ... 47:
                  set_irq_chip(irq, &clps7500_d_chip);
                  set_irq_handler(irq, handle_level_irq);
                  set_irq_flags(irq, flags);
                  break;

            case 48 ... 55:
                  set_irq_chip(irq, &clps7500_no_chip);
                  set_irq_handler(irq, handle_level_irq);
                  set_irq_flags(irq, flags);
                  break;

            case 64 ... 72:
                  set_irq_chip(irq, &clps7500_fiq_chip);
                  set_irq_handler(irq, handle_level_irq);
                  set_irq_flags(irq, flags);
                  break;
            }
      }

      setup_irq(IRQ_ISA, &irq_isa);
}

static struct map_desc cl7500_io_desc[] __initdata = {
      {     /* IO space */
            .virtual    = (unsigned long)IO_BASE,
            .pfn        = __phys_to_pfn(IO_START),
            .length           = IO_SIZE,
            .type       = MT_DEVICE
      }, {  /* ISA space      */
            .virtual    = ISA_BASE,
            .pfn        = __phys_to_pfn(ISA_START),
            .length           = ISA_SIZE,
            .type       = MT_DEVICE
      }, {  /* Flash    */
            .virtual    = FLASH_BASE,
            .pfn        = __phys_to_pfn(FLASH_START),
            .length           = FLASH_SIZE,
            .type       = MT_DEVICE
      }, {  /* LED            */
            .virtual    = LED_BASE,
            .pfn        = __phys_to_pfn(LED_START),
            .length           = LED_SIZE,
            .type       = MT_DEVICE
      }
};

static void __init clps7500_map_io(void)
{
      iotable_init(cl7500_io_desc, ARRAY_SIZE(cl7500_io_desc));
}

extern void ioctime_init(void);
extern unsigned long ioc_timer_gettimeoffset(void);

static irqreturn_t
clps7500_timer_interrupt(int irq, void *dev_id)
{
      write_seqlock(&xtime_lock);

      timer_tick();

      /* Why not using do_leds interface?? */
      {
            /* Twinkle the lights. */
            static int count, state = 0xff00;
            if (count-- == 0) {
                  state ^= 0x100;
                  count = 25;
                  *((volatile unsigned int *)LED_ADDRESS) = state;
            }
      }

      write_sequnlock(&xtime_lock);

      return IRQ_HANDLED;
}

static struct irqaction clps7500_timer_irq = {
      .name       = "CLPS7500 Timer Tick",
      .flags            = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
      .handler    = clps7500_timer_interrupt,
};

/*
 * Set up timer interrupt.
 */
static void __init clps7500_timer_init(void)
{
      ioctime_init();
      setup_irq(IRQ_TIMER, &clps7500_timer_irq);
}

static struct sys_timer clps7500_timer = {
      .init       = clps7500_timer_init,
      .offset           = ioc_timer_gettimeoffset,
};

static struct plat_serial8250_port serial_platform_data[] = {
      {
            .mapbase    = 0x03010fe0,
            .irq        = 10,
            .uartclk    = 1843200,
            .regshift   = 2,
            .iotype           = UPIO_MEM,
            .flags            = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
      },
      {
            .mapbase    = 0x03010be0,
            .irq        = 0,
            .uartclk    = 1843200,
            .regshift   = 2,
            .iotype           = UPIO_MEM,
            .flags            = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
      },
      {
            .iobase           = ISASLOT_IO + 0x2e8,
            .irq        = 41,
            .uartclk    = 1843200,
            .regshift   = 0,
            .iotype           = UPIO_PORT,
            .flags            = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
      },
      {
            .iobase           = ISASLOT_IO + 0x3e8,
            .irq        = 40,
            .uartclk    = 1843200,
            .regshift   = 0,
            .iotype           = UPIO_PORT,
            .flags            = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
      },
      { },
};

static struct platform_device serial_device = {
      .name             = "serial8250",
      .id               = PLAT8250_DEV_PLATFORM,
      .dev              = {
            .platform_data    = serial_platform_data,
      },
};

static void __init clps7500_init(void)
{
      platform_device_register(&serial_device);
}

MACHINE_START(CLPS7500, "CL-PS7500")
      /* Maintainer: Philip Blundell */
      .phys_io    = 0x03000000,
      .io_pg_offst      = ((0xe0000000) >> 18) & 0xfffc,
      .map_io           = clps7500_map_io,
      .init_irq   = clps7500_init_irq,
      .init_machine     = clps7500_init,
      .timer            = &clps7500_timer,
MACHINE_END


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