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>
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/* linux/arch/arm/mach-s3c2410/s3c2410.c
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*
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* Copyright (c) 2003-2005 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* http://www.simtec.co.uk/products/EB2410ITX/
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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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* Modifications:
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* 16-May-2003 BJD Created initial version
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* 16-Aug-2003 BJD Fixed header files and copyright, added URL
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* 05-Sep-2003 BJD Moved to kernel v2.6
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* 18-Jan-2004 BJD Added serial port configuration
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* 21-Aug-2004 BJD Added new struct s3c2410_board handler
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* 28-Sep-2004 BJD Updates for new serial port bits
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* 04-Nov-2004 BJD Updated UART configuration process
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* 10-Jan-2005 BJD Removed s3c2410_clock_tick_rate
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* 13-Aug-2005 DA Removed UART from initial I/O mappings
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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/sysdev.h>
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#include <linux/platform_device.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 "s3c2410.h"
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#include "cpu.h"
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#include "devs.h"
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#include "clock.h"
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/* Initial IO mappings */
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static struct map_desc s3c2410_iodesc[] __initdata = {
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IODESC_ENT(USBHOST),
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IODESC_ENT(CLKPWR),
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IODESC_ENT(LCD),
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IODESC_ENT(TIMER),
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IODESC_ENT(ADC),
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IODESC_ENT(WATCHDOG),
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};
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/* our uart devices */
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/* uart registration process */
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void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
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{
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s3c24xx_init_uartdevs("s3c2410-uart", s3c2410_uart_resources, cfg, no);
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}
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/* s3c2410_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 s3c2410_map_io(struct map_desc *mach_desc, int mach_size)
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{
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/* register our io-tables */
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iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
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iotable_init(mach_desc, mach_size);
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}
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void __init s3c2410_init_clocks(int xtal)
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{
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unsigned long tmp;
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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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/* 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);
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tmp = __raw_readl(S3C2410_CLKDIVN);
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/* work out clock scalings */
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hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
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pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);
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/* print brieft summary of clocks, etc */
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printk("S3C2410: 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
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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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struct sysdev_class s3c2410_sysclass = {
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set_kset_name("s3c2410-core"),
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};
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static struct sys_device s3c2410_sysdev = {
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.cls = &s3c2410_sysclass,
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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 s3c2410_core_init(void)
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{
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return sysdev_class_register(&s3c2410_sysclass);
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}
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core_initcall(s3c2410_core_init);
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int __init s3c2410_init(void)
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{
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printk("S3C2410: Initialising architecture\n");
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return sysdev_register(&s3c2410_sysdev);
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}
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