arch/arm/mach-shark/core.c

   1 /*
   2  *  linux/arch/arm/mach-shark/arch.c
   3  *
   4  *  Architecture specific stuff.
   5  */
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/irq.h>
  10 #include <linux/sched.h>
  11 #include <linux/serial_8250.h>
  12 #include <linux/io.h>
  13
  14 #include <asm/setup.h>
  15 #include <asm/mach-types.h>
  16 #include <asm/leds.h>
  17 #include <asm/param.h>
  18
  19 #include <asm/mach/map.h>
  20 #include <asm/mach/arch.h>
  21 #include <asm/mach/time.h>
  22
  23 #define IO_BASE                 0xe0000000
  24 #define IO_SIZE                 0x08000000
  25 #define IO_START                0x40000000
  26 #define ROMCARD_SIZE            0x08000000
  27 #define ROMCARD_START           0x10000000
  28
  29 static void shark_restart(char mode, const char *cmd)
  30 {
  31         short temp;
  32         /* Reset the Machine via pc[3] of the sequoia chipset */
  33         outw(0x09,0x24);
  34         temp=inw(0x26);
  35         temp = temp | (1<<3) | (1<<10);
  36         outw(0x09,0x24);
  37         outw(temp,0x26);
  38 }
  39
  40 static struct plat_serial8250_port serial_platform_data[] = {
  41         {
  42                 .iobase         = 0x3f8,
  43                 .irq            = 4,
  44                 .uartclk        = 1843200,
  45                 .regshift       = 0,
  46                 .iotype         = UPIO_PORT,
  47                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  48         },
  49         {
  50                 .iobase         = 0x2f8,
  51                 .irq            = 3,
  52                 .uartclk        = 1843200,
  53                 .regshift       = 0,
  54                 .iotype         = UPIO_PORT,
  55                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  56         },
  57         { },
  58 };
  59
  60 static struct platform_device serial_device = {
  61         .name                   = "serial8250",
  62         .id                     = PLAT8250_DEV_PLATFORM,
  63         .dev                    = {
  64                 .platform_data  = serial_platform_data,
  65         },
  66 };
  67
  68 static struct resource rtc_resources[] = {
  69         [0] = {
  70                 .start  = 0x70,
  71                 .end    = 0x73,
  72                 .flags  = IORESOURCE_IO,
  73         },
  74         [1] = {
  75                 .start  = IRQ_ISA_RTC_ALARM,
  76                 .end    = IRQ_ISA_RTC_ALARM,
  77                 .flags  = IORESOURCE_IRQ,
  78         }
  79 };
  80
  81 static struct platform_device rtc_device = {
  82         .name           = "rtc_cmos",
  83         .id             = -1,
  84         .resource       = rtc_resources,
  85         .num_resources  = ARRAY_SIZE(rtc_resources),
  86 };
  87
  88 static int __init shark_init(void)
  89 {
  90         int ret;
  91
  92         if (machine_is_shark())
  93         {
  94                 ret = platform_device_register(&rtc_device);
  95                 if (ret) printk(KERN_ERR "Unable to register RTC device: %d\n", ret);
  96                 ret = platform_device_register(&serial_device);
  97                 if (ret) printk(KERN_ERR "Unable to register Serial device: %d\n", ret);
  98         }
  99         return 0;
 100 }
 101
 102 arch_initcall(shark_init);
 103
 104 extern void shark_init_irq(void);
 105
 106 static struct map_desc shark_io_desc[] __initdata = {
 107         {
 108                 .virtual        = IO_BASE,
 109                 .pfn            = __phys_to_pfn(IO_START),
 110                 .length         = IO_SIZE,
 111                 .type           = MT_DEVICE
 112         }
 113 };
 114
 115 static void __init shark_map_io(void)
 116 {
 117         iotable_init(shark_io_desc, ARRAY_SIZE(shark_io_desc));
 118 }
 119
 120 #define IRQ_TIMER 0
 121 #define HZ_TIME ((1193180 + HZ/2) / HZ)
 122
 123 static irqreturn_t
 124 shark_timer_interrupt(int irq, void *dev_id)
 125 {
 126         timer_tick();
 127         return IRQ_HANDLED;
 128 }
 129
 130 static struct irqaction shark_timer_irq = {
 131         .name           = "Shark Timer Tick",
 132         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 133         .handler        = shark_timer_interrupt,
 134 };
 135
 136 /*
 137  * Set up timer interrupt, and return the current time in seconds.
 138  */
 139 static void __init shark_timer_init(void)
 140 {
 141         outb(0x34, 0x43);               /* binary, mode 0, LSB/MSB, Ch 0 */
 142         outb(HZ_TIME & 0xff, 0x40);     /* LSB of count */
 143         outb(HZ_TIME >> 8, 0x40);
 144
 145         setup_irq(IRQ_TIMER, &shark_timer_irq);
 146 }
 147
 148 static struct sys_timer shark_timer = {
 149         .init           = shark_timer_init,
 150 };
 151
 152 static void shark_init_early(void)
 153 {
 154         disable_hlt();
 155 }
 156
 157 MACHINE_START(SHARK, "Shark")
 158         /* Maintainer: Alexander Schulz */
 159         .atag_offset    = 0x3000,
 160         .map_io         = shark_map_io,
 161         .init_early     = shark_init_early,
 162         .init_irq       = shark_init_irq,
 163         .timer          = &shark_timer,
 164         .dma_zone_size  = SZ_4M,
 165         .restart        = shark_restart,
 166 MACHINE_END