1 /* linux/arch/arm/mach-s3c2410/s3c2410.c
3 * Copyright (c) 2003,2004 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * http://www.simtec.co.uk/products/EB2410ITX/
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.
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
22 #include <linux/kernel.h>
23 #include <linux/types.h>
24 #include <linux/interrupt.h>
25 #include <linux/list.h>
26 #include <linux/timer.h>
27 #include <linux/init.h>
28 #include <linux/device.h>
30 #include <asm/mach/arch.h>
31 #include <asm/mach/map.h>
32 #include <asm/mach/irq.h>
34 #include <asm/hardware.h>
38 #include <asm/arch/regs-clock.h>
39 #include <asm/arch/regs-serial.h>
45 int s3c2410_clock_tick_rate = 12*1000*1000; /* current timers at 12MHz */
47 /* Initial IO mappings */
49 static struct map_desc s3c2410_iodesc[] __initdata = {
59 static struct resource s3c_uart0_resource[] = {
61 .start = S3C2410_PA_UART0,
62 .end = S3C2410_PA_UART0 + 0x3fff,
63 .flags = IORESOURCE_MEM,
66 .start = IRQ_S3CUART_RX0,
67 .end = IRQ_S3CUART_ERR0,
68 .flags = IORESOURCE_IRQ,
73 static struct resource s3c_uart1_resource[] = {
75 .start = S3C2410_PA_UART1,
76 .end = S3C2410_PA_UART1 + 0x3fff,
77 .flags = IORESOURCE_MEM,
80 .start = IRQ_S3CUART_RX1,
81 .end = IRQ_S3CUART_ERR1,
82 .flags = IORESOURCE_IRQ,
86 static struct resource s3c_uart2_resource[] = {
88 .start = S3C2410_PA_UART2,
89 .end = S3C2410_PA_UART2 + 0x3fff,
90 .flags = IORESOURCE_MEM,
93 .start = IRQ_S3CUART_RX2,
94 .end = IRQ_S3CUART_ERR2,
95 .flags = IORESOURCE_IRQ,
99 /* our uart devices */
101 static struct platform_device s3c_uart0 = {
102 .name = "s3c2410-uart",
104 .num_resources = ARRAY_SIZE(s3c_uart0_resource),
105 .resource = s3c_uart0_resource,
109 static struct platform_device s3c_uart1 = {
110 .name = "s3c2410-uart",
112 .num_resources = ARRAY_SIZE(s3c_uart1_resource),
113 .resource = s3c_uart1_resource,
116 static struct platform_device s3c_uart2 = {
117 .name = "s3c2410-uart",
119 .num_resources = ARRAY_SIZE(s3c_uart2_resource),
120 .resource = s3c_uart2_resource,
123 static struct platform_device *uart_devices[] __initdata = {
129 /* store our uart devices for the serial driver console */
130 struct platform_device *s3c2410_uart_devices[3];
132 static int s3c2410_uart_count = 0;
134 /* uart registration process */
136 void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
138 struct platform_device *platdev;
141 for (uart = 0; uart < no; uart++, cfg++) {
142 platdev = uart_devices[cfg->hwport];
144 s3c24xx_uart_devs[uart] = platdev;
145 platdev->dev.platform_data = cfg;
148 s3c2410_uart_count = uart;
153 * register the standard cpu IO areas, and any passed in from the
154 * machine specific initialisation.
156 * this function also sets the initial clock frequencies from the
160 void __init s3c2410_map_io(struct map_desc *mach_desc, int mach_size)
164 /* register our io-tables */
166 iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
167 iotable_init(mach_desc, mach_size);
169 /* now we've got our machine bits initialised, work out what
170 * clocks we've got */
172 s3c24xx_fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON),
175 tmp = __raw_readl(S3C2410_CLKDIVN);
177 /* work out clock scalings */
179 s3c24xx_hclk = s3c24xx_fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
180 s3c24xx_pclk = s3c24xx_hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);
182 /* print brieft summary of clocks, etc */
184 printk("S3C2410: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
185 print_mhz(s3c24xx_fclk), print_mhz(s3c24xx_hclk),
186 print_mhz(s3c24xx_pclk));
188 /* initialise the clocks here, to allow other things like the
189 * console to use them
192 s3c2410_init_clocks();
195 int __init s3c2410_init(void)
197 printk("S3C2410: Initialising architecture\n");
199 return platform_add_devices(s3c24xx_uart_devs, s3c2410_uart_count);