arch/arm/mach-s3c2410/s3c2410.c

   1 /* linux/arch/arm/mach-s3c2410/s3c2410.c
   2  *
   3  * Copyright (c) 2003-2005 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * http://www.simtec.co.uk/products/EB2410ITX/
   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  *     16-May-2003 BJD  Created initial version
  14  *     16-Aug-2003 BJD  Fixed header files and copyright, added URL
  15  *     05-Sep-2003 BJD  Moved to kernel v2.6
  16  *     18-Jan-2004 BJD  Added serial port configuration
  17  *     21-Aug-2004 BJD  Added new struct s3c2410_board handler
  18  *     28-Sep-2004 BJD  Updates for new serial port bits
  19  *     04-Nov-2004 BJD  Updated UART configuration process
  20  *     10-Jan-2005 BJD  Removed s3c2410_clock_tick_rate
  21 */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/types.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/list.h>
  27 #include <linux/timer.h>
  28 #include <linux/init.h>
  29 #include <linux/device.h>
  30
  31 #include <asm/mach/arch.h>
  32 #include <asm/mach/map.h>
  33 #include <asm/mach/irq.h>
  34
  35 #include <asm/hardware.h>
  36 #include <asm/io.h>
  37 #include <asm/irq.h>
  38
  39 #include <asm/arch/regs-clock.h>
  40 #include <asm/arch/regs-serial.h>
  41
  42 #include "s3c2410.h"
  43 #include "cpu.h"
  44 #include "clock.h"
  45
  46 /* Initial IO mappings */
  47
  48 static struct map_desc s3c2410_iodesc[] __initdata = {
  49         IODESC_ENT(USBHOST),
  50         IODESC_ENT(CLKPWR),
  51         IODESC_ENT(LCD),
  52         IODESC_ENT(UART),
  53         IODESC_ENT(TIMER),
  54         IODESC_ENT(ADC),
  55         IODESC_ENT(WATCHDOG)
  56 };
  57
  58 static struct resource s3c_uart0_resource[] = {
  59         [0] = {
  60                 .start = S3C2410_PA_UART0,
  61                 .end   = S3C2410_PA_UART0 + 0x3fff,
  62                 .flags = IORESOURCE_MEM,
  63         },
  64         [1] = {
  65                 .start = IRQ_S3CUART_RX0,
  66                 .end   = IRQ_S3CUART_ERR0,
  67                 .flags = IORESOURCE_IRQ,
  68         }
  69
  70 };
  71
  72 static struct resource s3c_uart1_resource[] = {
  73         [0] = {
  74                 .start = S3C2410_PA_UART1,
  75                 .end   = S3C2410_PA_UART1 + 0x3fff,
  76                 .flags = IORESOURCE_MEM,
  77         },
  78         [1] = {
  79                 .start = IRQ_S3CUART_RX1,
  80                 .end   = IRQ_S3CUART_ERR1,
  81                 .flags = IORESOURCE_IRQ,
  82         }
  83 };
  84
  85 static struct resource s3c_uart2_resource[] = {
  86         [0] = {
  87                 .start = S3C2410_PA_UART2,
  88                 .end   = S3C2410_PA_UART2 + 0x3fff,
  89                 .flags = IORESOURCE_MEM,
  90         },
  91         [1] = {
  92                 .start = IRQ_S3CUART_RX2,
  93                 .end   = IRQ_S3CUART_ERR2,
  94                 .flags = IORESOURCE_IRQ,
  95         }
  96 };
  97
  98 /* our uart devices */
  99
 100 static struct platform_device s3c_uart0 = {
 101         .name             = "s3c2410-uart",
 102         .id               = 0,
 103         .num_resources    = ARRAY_SIZE(s3c_uart0_resource),
 104         .resource         = s3c_uart0_resource,
 105 };
 106
 107
 108 static struct platform_device s3c_uart1 = {
 109         .name             = "s3c2410-uart",
 110         .id               = 1,
 111         .num_resources    = ARRAY_SIZE(s3c_uart1_resource),
 112         .resource         = s3c_uart1_resource,
 113 };
 114
 115 static struct platform_device s3c_uart2 = {
 116         .name             = "s3c2410-uart",
 117         .id               = 2,
 118         .num_resources    = ARRAY_SIZE(s3c_uart2_resource),
 119         .resource         = s3c_uart2_resource,
 120 };
 121
 122 static struct platform_device *uart_devices[] __initdata = {
 123         &s3c_uart0,
 124         &s3c_uart1,
 125         &s3c_uart2
 126 };
 127
 128 /* store our uart devices for the serial driver console */
 129 struct platform_device *s3c2410_uart_devices[3];
 130
 131 static int s3c2410_uart_count = 0;
 132
 133 /* uart registration process */
 134
 135 void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
 136 {
 137         struct platform_device *platdev;
 138         int uart;
 139
 140         for (uart = 0; uart < no; uart++, cfg++) {
 141                 platdev = uart_devices[cfg->hwport];
 142
 143                 s3c24xx_uart_devs[uart] = platdev;
 144                 platdev->dev.platform_data = cfg;
 145         }
 146
 147         s3c2410_uart_count = uart;
 148 }
 149
 150 /* s3c2410_map_io
 151  *
 152  * register the standard cpu IO areas, and any passed in from the
 153  * machine specific initialisation.
 154 */
 155
 156 void __init s3c2410_map_io(struct map_desc *mach_desc, int mach_size)
 157 {
 158         /* register our io-tables */
 159
 160         iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
 161         iotable_init(mach_desc, mach_size);
 162 }
 163
 164 void __init s3c2410_init_clocks(int xtal)
 165 {
 166         unsigned long tmp;
 167         unsigned long fclk;
 168         unsigned long hclk;
 169         unsigned long pclk;
 170
 171         /* now we've got our machine bits initialised, work out what
 172          * clocks we've got */
 173
 174         fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal);
 175
 176         tmp = __raw_readl(S3C2410_CLKDIVN);
 177
 178         /* work out clock scalings */
 179
 180         hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
 181         pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);
 182
 183         /* print brieft summary of clocks, etc */
 184
 185         printk("S3C2410: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 186                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 187
 188         /* initialise the clocks here, to allow other things like the
 189          * console to use them
 190          */
 191
 192         s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
 193 }
 194
 195 int __init s3c2410_init(void)
 196 {
 197         printk("S3C2410: Initialising architecture\n");
 198
 199         return platform_add_devices(s3c24xx_uart_devs, s3c2410_uart_count);
 200 }