236 lines
5.5 KiB
C
236 lines
5.5 KiB
C
/* linux/arch/arm/mach-s3c2412/s3c2412.c
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*
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* Copyright (c) 2006 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* http://armlinux.simtec.co.uk/.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/timer.h>
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#include <linux/init.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/sysdev.h>
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#include <linux/serial_core.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <asm/mach/irq.h>
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#include <mach/hardware.h>
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#include <asm/proc-fns.h>
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#include <asm/irq.h>
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#include <mach/reset.h>
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#include <mach/idle.h>
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#include <plat/cpu-freq.h>
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#include <mach/regs-clock.h>
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#include <plat/regs-serial.h>
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#include <mach/regs-power.h>
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#include <mach/regs-gpio.h>
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#include <mach/regs-gpioj.h>
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#include <mach/regs-dsc.h>
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#include <plat/regs-spi.h>
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#include <mach/regs-s3c2412.h>
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#include <plat/s3c2412.h>
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#include <plat/cpu.h>
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#include <plat/devs.h>
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#include <plat/clock.h>
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#include <plat/pm.h>
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#include <plat/pll.h>
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#ifndef CONFIG_CPU_S3C2412_ONLY
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void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO;
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static inline void s3c2412_init_gpio2(void)
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{
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s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10;
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}
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#else
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#define s3c2412_init_gpio2() do { } while(0)
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#endif
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/* Initial IO mappings */
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static struct map_desc s3c2412_iodesc[] __initdata = {
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IODESC_ENT(CLKPWR),
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IODESC_ENT(TIMER),
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IODESC_ENT(WATCHDOG),
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};
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/* uart registration process */
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void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no)
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{
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s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no);
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/* rename devices that are s3c2412/s3c2413 specific */
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s3c_device_sdi.name = "s3c2412-sdi";
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s3c_device_lcd.name = "s3c2412-lcd";
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s3c_device_nand.name = "s3c2412-nand";
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/* alter IRQ of SDI controller */
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s3c_device_sdi.resource[1].start = IRQ_S3C2412_SDI;
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s3c_device_sdi.resource[1].end = IRQ_S3C2412_SDI;
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/* spi channel related changes, s3c2412/13 specific */
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s3c_device_spi0.name = "s3c2412-spi";
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s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24;
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s3c_device_spi1.name = "s3c2412-spi";
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s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1;
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s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24;
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}
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/* s3c2412_idle
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*
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* use the standard idle call by ensuring the idle mode
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* in power config, then issuing the idle co-processor
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* instruction
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*/
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static void s3c2412_idle(void)
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{
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unsigned long tmp;
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/* ensure our idle mode is to go to idle */
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tmp = __raw_readl(S3C2412_PWRCFG);
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tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
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tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
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__raw_writel(tmp, S3C2412_PWRCFG);
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cpu_do_idle();
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}
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static void s3c2412_hard_reset(void)
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{
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/* errata "Watch-dog/Software Reset Problem" specifies that
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* this reset must be done with the SYSCLK sourced from
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* EXTCLK instead of FOUT to avoid a glitch in the reset
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* mechanism.
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*
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* See the watchdog section of the S3C2412 manual for more
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* information on this fix.
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*/
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__raw_writel(0x00, S3C2412_CLKSRC);
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__raw_writel(S3C2412_SWRST_RESET, S3C2412_SWRST);
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mdelay(1);
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}
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/* s3c2412_map_io
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*
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* register the standard cpu IO areas, and any passed in from the
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* machine specific initialisation.
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*/
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void __init s3c2412_map_io(void)
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{
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/* move base of IO */
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s3c2412_init_gpio2();
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/* set our idle function */
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s3c24xx_idle = s3c2412_idle;
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/* set custom reset hook */
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s3c24xx_reset_hook = s3c2412_hard_reset;
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/* register our io-tables */
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iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc));
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}
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void __init_or_cpufreq s3c2412_setup_clocks(void)
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{
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struct clk *xtal_clk;
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unsigned long tmp;
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unsigned long xtal;
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unsigned long fclk;
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unsigned long hclk;
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unsigned long pclk;
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xtal_clk = clk_get(NULL, "xtal");
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xtal = clk_get_rate(xtal_clk);
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clk_put(xtal_clk);
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/* now we've got our machine bits initialised, work out what
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* clocks we've got */
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fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal * 2);
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clk_mpll.rate = fclk;
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tmp = __raw_readl(S3C2410_CLKDIVN);
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/* work out clock scalings */
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hclk = fclk / ((tmp & S3C2412_CLKDIVN_HDIVN_MASK) + 1);
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hclk /= ((tmp & S3C2412_CLKDIVN_ARMDIVN) ? 2 : 1);
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pclk = hclk / ((tmp & S3C2412_CLKDIVN_PDIVN) ? 2 : 1);
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/* print brieft summary of clocks, etc */
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printk("S3C2412: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
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print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
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s3c24xx_setup_clocks(fclk, hclk, pclk);
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}
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void __init s3c2412_init_clocks(int xtal)
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{
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/* initialise the clocks here, to allow other things like the
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* console to use them
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*/
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s3c24xx_register_baseclocks(xtal);
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s3c2412_setup_clocks();
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s3c2412_baseclk_add();
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}
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/* need to register class before we actually register the device, and
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* we also need to ensure that it has been initialised before any of the
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* drivers even try to use it (even if not on an s3c2412 based system)
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* as a driver which may support both 2410 and 2440 may try and use it.
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*/
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struct sysdev_class s3c2412_sysclass = {
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.name = "s3c2412-core",
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};
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static int __init s3c2412_core_init(void)
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{
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return sysdev_class_register(&s3c2412_sysclass);
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}
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core_initcall(s3c2412_core_init);
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static struct sys_device s3c2412_sysdev = {
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.cls = &s3c2412_sysclass,
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};
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int __init s3c2412_init(void)
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{
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printk("S3C2412: Initialising architecture\n");
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return sysdev_register(&s3c2412_sysdev);
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}
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