22346aea8d
Patch from Ben Dooks Make the S3C2410 use the same usb clock naming as the S3C2412 Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
272 lines
6.4 KiB
C
272 lines
6.4 KiB
C
/* linux/arch/arm/mach-s3c2410/clock.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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* S3C2410,S3C2440,S3C2442 Clock control 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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/sysdev.h>
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#include <linux/clk.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <asm/hardware.h>
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#include <asm/io.h>
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#include <asm/arch/regs-clock.h>
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#include <asm/arch/regs-gpio.h>
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#include "clock.h"
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#include "cpu.h"
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int s3c2410_clkcon_enable(struct clk *clk, int enable)
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{
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unsigned int clocks = clk->ctrlbit;
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unsigned long clkcon;
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clkcon = __raw_readl(S3C2410_CLKCON);
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if (enable)
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clkcon |= clocks;
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else
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clkcon &= ~clocks;
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/* ensure none of the special function bits set */
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clkcon &= ~(S3C2410_CLKCON_IDLE|S3C2410_CLKCON_POWER);
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__raw_writel(clkcon, S3C2410_CLKCON);
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return 0;
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}
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static int s3c2410_upll_enable(struct clk *clk, int enable)
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{
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unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW);
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unsigned long orig = clkslow;
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if (enable)
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clkslow &= ~S3C2410_CLKSLOW_UCLK_OFF;
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else
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clkslow |= S3C2410_CLKSLOW_UCLK_OFF;
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__raw_writel(clkslow, S3C2410_CLKSLOW);
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/* if we started the UPLL, then allow to settle */
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if (enable && (orig & S3C2410_CLKSLOW_UCLK_OFF))
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udelay(200);
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return 0;
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}
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/* standard clock definitions */
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static struct clk init_clocks_disable[] = {
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{
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.name = "nand",
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.id = -1,
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.parent = &clk_h,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_NAND,
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}, {
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.name = "sdi",
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.id = -1,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_SDI,
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}, {
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.name = "adc",
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.id = -1,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_ADC,
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}, {
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.name = "i2c",
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.id = -1,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_IIC,
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}, {
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.name = "iis",
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.id = -1,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_IIS,
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}, {
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.name = "spi",
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.id = -1,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_SPI,
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}
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};
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static struct clk init_clocks[] = {
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{
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.name = "lcd",
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.id = -1,
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.parent = &clk_h,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_LCDC,
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}, {
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.name = "gpio",
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.id = -1,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_GPIO,
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}, {
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.name = "usb-host",
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.id = -1,
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.parent = &clk_h,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_USBH,
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}, {
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.name = "usb-device",
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.id = -1,
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.parent = &clk_h,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_USBD,
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}, {
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.name = "timers",
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.id = -1,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_PWMT,
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}, {
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.name = "uart",
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.id = 0,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_UART0,
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}, {
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.name = "uart",
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.id = 1,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_UART1,
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}, {
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.name = "uart",
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.id = 2,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_UART2,
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}, {
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.name = "rtc",
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.id = -1,
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.parent = &clk_p,
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.enable = s3c2410_clkcon_enable,
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.ctrlbit = S3C2410_CLKCON_RTC,
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}, {
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.name = "watchdog",
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.id = -1,
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.parent = &clk_p,
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.ctrlbit = 0,
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}, {
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.name = "usb-bus-host",
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.id = -1,
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.parent = &clk_usb_bus,
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}, {
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.name = "usb-bus-gadget",
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.id = -1,
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.parent = &clk_usb_bus,
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},
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};
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/* s3c2410_baseclk_add()
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*
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* Add all the clocks used by the s3c2410 or compatible CPUs
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* such as the S3C2440 and S3C2442.
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*
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* We cannot use a system device as we are needed before any
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* of the init-calls that initialise the devices are actually
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* done.
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*/
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int __init s3c2410_baseclk_add(void)
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{
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unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW);
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unsigned long clkcon = __raw_readl(S3C2410_CLKCON);
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struct clk *clkp;
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struct clk *xtal;
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int ret;
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int ptr;
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clk_upll.enable = s3c2410_upll_enable;
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if (s3c24xx_register_clock(&clk_usb_bus) < 0)
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printk(KERN_ERR "failed to register usb bus clock\n");
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/* register clocks from clock array */
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clkp = init_clocks;
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for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
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/* ensure that we note the clock state */
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clkp->usage = clkcon & clkp->ctrlbit ? 1 : 0;
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ret = s3c24xx_register_clock(clkp);
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if (ret < 0) {
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printk(KERN_ERR "Failed to register clock %s (%d)\n",
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clkp->name, ret);
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}
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}
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/* We must be careful disabling the clocks we are not intending to
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* be using at boot time, as subsytems such as the LCD which do
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* their own DMA requests to the bus can cause the system to lockup
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* if they where in the middle of requesting bus access.
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*
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* Disabling the LCD clock if the LCD is active is very dangerous,
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* and therefore the bootloader should be careful to not enable
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* the LCD clock if it is not needed.
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*/
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/* install (and disable) the clocks we do not need immediately */
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clkp = init_clocks_disable;
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for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
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ret = s3c24xx_register_clock(clkp);
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if (ret < 0) {
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printk(KERN_ERR "Failed to register clock %s (%d)\n",
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clkp->name, ret);
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}
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s3c2410_clkcon_enable(clkp, 0);
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}
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/* show the clock-slow value */
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xtal = clk_get(NULL, "xtal");
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printk("CLOCK: Slow mode (%ld.%ld MHz), %s, MPLL %s, UPLL %s\n",
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print_mhz(clk_get_rate(xtal) /
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( 2 * S3C2410_CLKSLOW_GET_SLOWVAL(clkslow))),
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(clkslow & S3C2410_CLKSLOW_SLOW) ? "slow" : "fast",
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(clkslow & S3C2410_CLKSLOW_MPLL_OFF) ? "off" : "on",
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(clkslow & S3C2410_CLKSLOW_UCLK_OFF) ? "off" : "on");
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return 0;
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}
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