99c13853ff
Patch from Ben Dooks Split the s3c2410 specific clocks from the core clock code, as part of the work to support more of the Samsung line of SoCs. The patch does not use the sysdev mechanism as the clocks are needed for the timer init, which is very early in the kernel init sequence. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
185 lines
4.3 KiB
C
185 lines
4.3 KiB
C
/* linux/arch/arm/mach-s3c2410/s3c244x.c
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*
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* Copyright (c) 2004-2006 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* Samsung S3C2440 and S3C2442 Mobile CPU support
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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/platform_device.h>
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#include <linux/sysdev.h>
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#include <linux/clk.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 <asm/hardware.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/arch/regs-clock.h>
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#include <asm/arch/regs-serial.h>
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#include <asm/arch/regs-gpio.h>
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#include <asm/arch/regs-gpioj.h>
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#include <asm/arch/regs-dsc.h>
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#include "s3c2410.h"
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#include "s3c2440.h"
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#include "s3c244x.h"
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#include "clock.h"
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#include "devs.h"
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#include "cpu.h"
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#include "pm.h"
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static struct map_desc s3c244x_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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IODESC_ENT(LCD),
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IODESC_ENT(ADC),
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IODESC_ENT(USBHOST),
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};
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/* uart initialisation */
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void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
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{
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s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
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}
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void __init s3c244x_map_io(struct map_desc *mach_desc, int size)
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{
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/* register our io-tables */
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iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
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iotable_init(mach_desc, size);
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/* rename any peripherals used differing from the s3c2410 */
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s3c_device_i2c.name = "s3c2440-i2c";
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s3c_device_nand.name = "s3c2440-nand";
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}
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void __init s3c244x_init_clocks(int xtal)
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{
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unsigned long clkdiv;
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unsigned long camdiv;
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unsigned long hclk, fclk, pclk;
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int hdiv = 1;
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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 = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
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clkdiv = __raw_readl(S3C2410_CLKDIVN);
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camdiv = __raw_readl(S3C2440_CAMDIVN);
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/* work out clock scalings */
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switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
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case S3C2440_CLKDIVN_HDIVN_1:
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hdiv = 1;
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break;
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case S3C2440_CLKDIVN_HDIVN_2:
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hdiv = 2;
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break;
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case S3C2440_CLKDIVN_HDIVN_4_8:
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hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
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break;
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case S3C2440_CLKDIVN_HDIVN_3_6:
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hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
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break;
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}
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hclk = fclk / hdiv;
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pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);
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/* print brief summary of clocks, etc */
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printk("S3C244X: 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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/* initialise the clocks here, to allow other things like the
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* console to use them, and to add new ones after the initialisation
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*/
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s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
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s3c2410_baseclk_add();
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}
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#ifdef CONFIG_PM
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static struct sleep_save s3c244x_sleep[] = {
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SAVE_ITEM(S3C2440_DSC0),
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SAVE_ITEM(S3C2440_DSC1),
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SAVE_ITEM(S3C2440_GPJDAT),
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SAVE_ITEM(S3C2440_GPJCON),
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SAVE_ITEM(S3C2440_GPJUP)
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};
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static int s3c244x_suspend(struct sys_device *dev, pm_message_t state)
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{
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s3c2410_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
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return 0;
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}
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static int s3c244x_resume(struct sys_device *dev)
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{
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s3c2410_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
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return 0;
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}
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#else
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#define s3c244x_suspend NULL
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#define s3c244x_resume NULL
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#endif
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/* Since the S3C2442 and S3C2440 share items, put both sysclasses here */
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struct sysdev_class s3c2440_sysclass = {
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set_kset_name("s3c2440-core"),
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.suspend = s3c244x_suspend,
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.resume = s3c244x_resume
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};
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struct sysdev_class s3c2442_sysclass = {
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set_kset_name("s3c2442-core"),
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.suspend = s3c244x_suspend,
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.resume = s3c244x_resume
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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 s3c2440 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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static int __init s3c2440_core_init(void)
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{
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return sysdev_class_register(&s3c2440_sysclass);
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}
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core_initcall(s3c2440_core_init);
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static int __init s3c2442_core_init(void)
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{
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return sysdev_class_register(&s3c2442_sysclass);
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}
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core_initcall(s3c2442_core_init);
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