arch/arm/mach-s3c2410/s3c2440.c

   1 /* linux/arch/arm/mach-s3c2410/s3c2440.c
   2  *
   3  * Copyright (c) 2004 Simtec Electronics
   4  *   Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * Samsung S3C2440 Mobile CPU support
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * Modifications:
  13  *     24-Aug-2004 BJD  Start of s3c2440 support
  14 */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/list.h>
  20 #include <linux/timer.h>
  21 #include <linux/init.h>
  22 #include <linux/device.h>
  23
  24 #include <asm/mach/arch.h>
  25 #include <asm/mach/map.h>
  26 #include <asm/mach/irq.h>
  27
  28 #include <asm/hardware.h>
  29 #include <asm/io.h>
  30 #include <asm/irq.h>
  31
  32 #include <asm/arch/regs-clock.h>
  33 #include <asm/arch/regs-serial.h>
  34
  35 #include "s3c2440.h"
  36 #include "cpu.h"
  37
  38 int s3c2440_clock_tick_rate = 12*1000*1000;  /* current timers at 12MHz */
  39
  40 /* clock info */
  41
  42 unsigned long s3c2440_baseclk = 12*1000*1000;  /* assume base is 12MHz */
  43 unsigned long s3c2440_hdiv;
  44
  45 unsigned long s3c2440_fclk;
  46 unsigned long s3c2440_hclk;
  47 unsigned long s3c2440_pclk;
  48
  49 static struct map_desc s3c2440_iodesc[] __initdata = {
  50         IODESC_ENT(USBHOST),
  51         IODESC_ENT(CLKPWR),
  52         IODESC_ENT(LCD),
  53         IODESC_ENT(TIMER),
  54         IODESC_ENT(ADC),
  55 };
  56
  57 static struct resource s3c_uart0_resource[] = {
  58         [0] = {
  59                 .start = S3C2410_PA_UART0,
  60                 .end   = S3C2410_PA_UART0 + 0x3fff,
  61                 .flags = IORESOURCE_MEM,
  62         },
  63         [1] = {
  64                 .start = IRQ_S3CUART_RX0,
  65                 .end   = IRQ_S3CUART_ERR0,
  66                 .flags = IORESOURCE_IRQ,
  67         }
  68
  69 };
  70
  71 static struct resource s3c_uart1_resource[] = {
  72         [0] = {
  73                 .start = S3C2410_PA_UART1,
  74                 .end   = S3C2410_PA_UART1 + 0x3fff,
  75                 .flags = IORESOURCE_MEM,
  76         },
  77         [1] = {
  78                 .start = IRQ_S3CUART_RX1,
  79                 .end   = IRQ_S3CUART_ERR1,
  80                 .flags = IORESOURCE_IRQ,
  81         }
  82 };
  83
  84 static struct resource s3c_uart2_resource[] = {
  85         [0] = {
  86                 .start = S3C2410_PA_UART2,
  87                 .end   = S3C2410_PA_UART2 + 0x3fff,
  88                 .flags = IORESOURCE_MEM,
  89         },
  90         [1] = {
  91                 .start = IRQ_S3CUART_RX2,
  92                 .end   = IRQ_S3CUART_ERR2,
  93                 .flags = IORESOURCE_IRQ,
  94         }
  95 };
  96
  97 /* our uart devices */
  98
  99 static struct platform_device s3c_uart0 = {
 100         .name             = "s3c2440-uart",
 101         .id               = 0,
 102         .num_resources    = ARRAY_SIZE(s3c_uart0_resource),
 103         .resource         = s3c_uart0_resource,
 104 };
 105
 106
 107 static struct platform_device s3c_uart1 = {
 108         .name             = "s3c2440-uart",
 109         .id               = 1,
 110         .num_resources    = ARRAY_SIZE(s3c_uart1_resource),
 111         .resource         = s3c_uart1_resource,
 112 };
 113
 114 static struct platform_device s3c_uart2 = {
 115         .name             = "s3c2440-uart",
 116         .id               = 2,
 117         .num_resources    = ARRAY_SIZE(s3c_uart2_resource),
 118         .resource         = s3c_uart2_resource,
 119 };
 120
 121 static struct platform_device *uart_devices[] __initdata = {
 122         &s3c_uart0,
 123         &s3c_uart1,
 124         &s3c_uart2
 125 };
 126
 127 void __init s3c2440_map_io(struct map_desc *mach_desc, int size)
 128 {
 129         unsigned long tmp;
 130         unsigned long camdiv;
 131
 132         /* register our io-tables */
 133
 134         iotable_init(s3c2440_iodesc, ARRAY_SIZE(s3c2440_iodesc));
 135         iotable_init(mach_desc, size);
 136
 137         /* now we've got our machine bits initialised, work out what
 138          * clocks we've got */
 139
 140         s3c2440_fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON),
 141                                        s3c2440_baseclk);
 142
 143         tmp = __raw_readl(S3C2410_CLKDIVN);
 144         camdiv = __raw_readl(S3C2440_CAMDIVN);
 145
 146         /* work out clock scalings */
 147
 148         switch (tmp & S3C2440_CLKDIVN_HDIVN_MASK) {
 149         case S3C2440_CLKDIVN_HDIVN_1:
 150                 s3c2440_hdiv = 1;
 151                 break;
 152
 153         case S3C2440_CLKDIVN_HDIVN_2:
 154                 s3c2440_hdiv = 1;
 155                 break;
 156
 157         case S3C2440_CLKDIVN_HDIVN_4_8:
 158                 s3c2440_hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
 159                 break;
 160
 161         case S3C2440_CLKDIVN_HDIVN_3_6:
 162                 s3c2440_hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 6 : 3;
 163                 break;
 164         }
 165
 166         s3c2440_hclk = s3c2440_fclk / s3c2440_hdiv;
 167         s3c2440_pclk = s3c2440_hclk / ((tmp & S3C2440_CLKDIVN_PDIVN) ? 2 : 1);
 168
 169         /* print brieft summary of clocks, etc */
 170
 171         printk("S3C2440: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 172                print_mhz(s3c2440_fclk), print_mhz(s3c2440_hclk),
 173                print_mhz(s3c2440_pclk));
 174 }
 175
 176
 177
 178 int __init s3c2440_init(void)
 179 {
 180         int ret;
 181
 182         printk("S3C2440: Initialising architecture\n");
 183
 184         ret = platform_add_devices(uart_devices, ARRAY_SIZE(uart_devices));
 185         if (ret)
 186                 return ret;
 187
 188         // todo: board specific inits?
 189
 190         return ret;
 191 }
 192