endmenu
+config S3C2410_CLOCK
+ bool
+ help
+ Clock code for the S3C2410, and similar processors
+
config CPU_S3C2410
bool
depends on ARCH_S3C2410
+ select S3C2410_CLOCK
help
Support for S3C2410 and S3C2410A family from the S3C24XX line
of Samsung Mobile CPUs.
config CPU_S3C2440
bool
depends on ARCH_S3C2410
+ select S3C2410_CLOCK
select CPU_S3C244X
help
Support for S3C2440 Samsung Mobile CPU based systems.
config CPU_S3C2442
bool
depends on ARCH_S3C2420
+ select S3C2410_CLOCK
select CPU_S3C244X
help
Support for S3C2442 Samsung Mobile CPU based systems.
obj-$(CONFIG_CPU_S3C244X) += s3c244x.o
obj-$(CONFIG_CPU_S3C244X) += s3c244x-irq.o
+# Clock control
+
+obj-$(CONFIG_S3C2410_CLOCK) += s3c2410-clock.o
+
# S3C2440 support
obj-$(CONFIG_CPU_S3C2440) += s3c2440.o s3c2440-dsc.o
* Copyright (c) 2004-2005 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
- * S3C2410 Clock control support
+ * S3C24XX Core clock control support
*
* Based on, and code from linux/arch/arm/mach-versatile/clock.c
**
DEFINE_MUTEX(clocks_mutex);
-/* old functions */
-
-void inline s3c24xx_clk_enable(unsigned int clocks, unsigned int enable)
-{
- unsigned long clkcon;
-
- clkcon = __raw_readl(S3C2410_CLKCON);
-
- if (enable)
- clkcon |= clocks;
- else
- clkcon &= ~clocks;
-
- /* ensure none of the special function bits set */
- clkcon &= ~(S3C2410_CLKCON_IDLE|S3C2410_CLKCON_POWER | 3);
-
- __raw_writel(clkcon, S3C2410_CLKCON);
-}
-
/* enable and disable calls for use with the clk struct */
static int clk_null_enable(struct clk *clk, int enable)
return 0;
}
-int s3c24xx_clkcon_enable(struct clk *clk, int enable)
-{
- s3c24xx_clk_enable(clk->ctrlbit, enable);
- return 0;
-}
-
/* Clock API calls */
struct clk *clk_get(struct device *dev, const char *id)
EXPORT_SYMBOL(clk_get_parent);
EXPORT_SYMBOL(clk_set_parent);
-/* base clock enable */
-
-static int s3c24xx_upll_enable(struct clk *clk, int enable)
-{
- unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW);
- unsigned long orig = clkslow;
-
- if (enable)
- clkslow &= ~S3C2410_CLKSLOW_UCLK_OFF;
- else
- clkslow |= S3C2410_CLKSLOW_UCLK_OFF;
-
- __raw_writel(clkslow, S3C2410_CLKSLOW);
-
- /* if we started the UPLL, then allow to settle */
-
- if (enable && (orig & S3C2410_CLKSLOW_UCLK_OFF))
- udelay(200);
-
- return 0;
-}
-
/* base clocks */
static struct clk clk_xtal = {
.ctrlbit = 0,
};
-static struct clk clk_upll = {
+struct clk clk_upll = {
.name = "upll",
.id = -1,
.parent = NULL,
- .enable = s3c24xx_upll_enable,
.ctrlbit = 0,
};
-static struct clk clk_f = {
+struct clk clk_f = {
.name = "fclk",
.id = -1,
.rate = 0,
.ctrlbit = 0,
};
-static struct clk clk_h = {
+struct clk clk_h = {
.name = "hclk",
.id = -1,
.rate = 0,
.ctrlbit = 0,
};
-static struct clk clk_p = {
+struct clk clk_p = {
.name = "pclk",
.id = -1,
.rate = 0,
.id = -1,
};
-
-/* standard clock definitions */
-
-static struct clk init_clocks[] = {
- {
- .name = "nand",
- .id = -1,
- .parent = &clk_h,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_NAND,
- }, {
- .name = "lcd",
- .id = -1,
- .parent = &clk_h,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_LCDC,
- }, {
- .name = "usb-host",
- .id = -1,
- .parent = &clk_h,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_USBH,
- }, {
- .name = "usb-device",
- .id = -1,
- .parent = &clk_h,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_USBD,
- }, {
- .name = "timers",
- .id = -1,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_PWMT,
- }, {
- .name = "sdi",
- .id = -1,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_SDI,
- }, {
- .name = "uart",
- .id = 0,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_UART0,
- }, {
- .name = "uart",
- .id = 1,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_UART1,
- }, {
- .name = "uart",
- .id = 2,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_UART2,
- }, {
- .name = "gpio",
- .id = -1,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_GPIO,
- }, {
- .name = "rtc",
- .id = -1,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_RTC,
- }, {
- .name = "adc",
- .id = -1,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_ADC,
- }, {
- .name = "i2c",
- .id = -1,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_IIC,
- }, {
- .name = "iis",
- .id = -1,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_IIS,
- }, {
- .name = "spi",
- .id = -1,
- .parent = &clk_p,
- .enable = s3c24xx_clkcon_enable,
- .ctrlbit = S3C2410_CLKCON_SPI,
- }, {
- .name = "watchdog",
- .id = -1,
- .parent = &clk_p,
- .ctrlbit = 0,
- }
-};
-
/* initialise the clock system */
int s3c24xx_register_clock(struct clk *clk)
if (clk->enable == NULL)
clk->enable = clk_null_enable;
- /* if this is a standard clock, set the usage state */
-
- if (clk->ctrlbit && clk->enable == s3c24xx_clkcon_enable) {
- unsigned long clkcon = __raw_readl(S3C2410_CLKCON);
-
- clk->usage = (clkcon & clk->ctrlbit) ? 1 : 0;
- }
-
/* add to the list of available clocks */
mutex_lock(&clocks_mutex);
unsigned long hclk,
unsigned long pclk)
{
- unsigned long upllcon = __raw_readl(S3C2410_UPLLCON);
- unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW);
- struct clk *clkp = init_clocks;
- int ptr;
- int ret;
-
- printk(KERN_INFO "S3C2410 Clocks, (c) 2004 Simtec Electronics\n");
+ printk(KERN_INFO "S3C24XX Clocks, (c) 2004 Simtec Electronics\n");
/* initialise the main system clocks */
clk_xtal.rate = xtal;
- clk_upll.rate = s3c2410_get_pll(upllcon, xtal);
+ clk_upll.rate = s3c2410_get_pll(__raw_readl(S3C2410_UPLLCON), xtal);
clk_h.rate = hclk;
clk_p.rate = pclk;
clk_f.rate = fclk;
- /* We must be careful disabling the clocks we are not intending to
- * be using at boot time, as subsytems such as the LCD which do
- * their own DMA requests to the bus can cause the system to lockup
- * if they where in the middle of requesting bus access.
- *
- * Disabling the LCD clock if the LCD is active is very dangerous,
- * and therefore the bootloader should be careful to not enable
- * the LCD clock if it is not needed.
- */
-
- mutex_lock(&clocks_mutex);
-
- s3c24xx_clk_enable(S3C2410_CLKCON_NAND, 0);
- s3c24xx_clk_enable(S3C2410_CLKCON_USBH, 0);
- s3c24xx_clk_enable(S3C2410_CLKCON_USBD, 0);
- s3c24xx_clk_enable(S3C2410_CLKCON_ADC, 0);
- s3c24xx_clk_enable(S3C2410_CLKCON_IIC, 0);
- s3c24xx_clk_enable(S3C2410_CLKCON_SPI, 0);
-
- mutex_unlock(&clocks_mutex);
-
/* assume uart clocks are correctly setup */
/* register our clocks */
if (s3c24xx_register_clock(&clk_p) < 0)
printk(KERN_ERR "failed to register cpu pclk\n");
-
- if (s3c24xx_register_clock(&clk_usb_bus) < 0)
- printk(KERN_ERR "failed to register usb bus clock\n");
-
- /* register clocks from clock array */
-
- for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
- ret = s3c24xx_register_clock(clkp);
- if (ret < 0) {
- printk(KERN_ERR "Failed to register clock %s (%d)\n",
- clkp->name, ret);
- }
- }
-
- /* show the clock-slow value */
-
- printk("CLOCK: Slow mode (%ld.%ld MHz), %s, MPLL %s, UPLL %s\n",
- print_mhz(xtal / ( 2 * S3C2410_CLKSLOW_GET_SLOWVAL(clkslow))),
- (clkslow & S3C2410_CLKSLOW_SLOW) ? "slow" : "fast",
- (clkslow & S3C2410_CLKSLOW_MPLL_OFF) ? "off" : "on",
- (clkslow & S3C2410_CLKSLOW_UCLK_OFF) ? "off" : "on");
-
return 0;
}
extern struct clk clk_usb_bus;
+/* core clock support */
+
+extern struct clk clk_f;
+extern struct clk clk_h;
+extern struct clk clk_p;
+extern struct clk clk_upll;
+
/* exports for arch/arm/mach-s3c2410
*
* Please DO NOT use these outside of arch/arm/mach-s3c2410
extern struct mutex clocks_mutex;
-extern int s3c24xx_clkcon_enable(struct clk *clk, int enable);
+extern int s3c2410_clkcon_enable(struct clk *clk, int enable);
+
extern int s3c24xx_register_clock(struct clk *clk);
extern int s3c24xx_setup_clocks(unsigned long xtal,
--- /dev/null
+/* linux/arch/arm/mach-s3c2410/clock.c
+ *
+ * Copyright (c) 2006 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2410,S3C2440,S3C2442 Clock control support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/sysdev.h>
+#include <linux/clk.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+
+#include <asm/arch/regs-clock.h>
+#include <asm/arch/regs-gpio.h>
+
+#include "clock.h"
+#include "cpu.h"
+
+int s3c2410_clkcon_enable(struct clk *clk, int enable)
+{
+ unsigned int clocks = clk->ctrlbit;
+ unsigned long clkcon;
+
+ clkcon = __raw_readl(S3C2410_CLKCON);
+
+ if (enable)
+ clkcon |= clocks;
+ else
+ clkcon &= ~clocks;
+
+ /* ensure none of the special function bits set */
+ clkcon &= ~(S3C2410_CLKCON_IDLE|S3C2410_CLKCON_POWER);
+
+ __raw_writel(clkcon, S3C2410_CLKCON);
+
+ return 0;
+}
+
+static int s3c2410_upll_enable(struct clk *clk, int enable)
+{
+ unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW);
+ unsigned long orig = clkslow;
+
+ if (enable)
+ clkslow &= ~S3C2410_CLKSLOW_UCLK_OFF;
+ else
+ clkslow |= S3C2410_CLKSLOW_UCLK_OFF;
+
+ __raw_writel(clkslow, S3C2410_CLKSLOW);
+
+ /* if we started the UPLL, then allow to settle */
+
+ if (enable && (orig & S3C2410_CLKSLOW_UCLK_OFF))
+ udelay(200);
+
+ return 0;
+}
+
+/* standard clock definitions */
+
+static struct clk init_clocks_disable[] = {
+ {
+ .name = "nand",
+ .id = -1,
+ .parent = &clk_h,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_NAND,
+ }, {
+ .name = "sdi",
+ .id = -1,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_SDI,
+ }, {
+ .name = "adc",
+ .id = -1,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_ADC,
+ }, {
+ .name = "i2c",
+ .id = -1,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_IIC,
+ }, {
+ .name = "iis",
+ .id = -1,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_IIS,
+ }, {
+ .name = "spi",
+ .id = -1,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_SPI,
+ }
+};
+
+static struct clk init_clocks[] = {
+ {
+ .name = "lcd",
+ .id = -1,
+ .parent = &clk_h,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_LCDC,
+ }, {
+ .name = "gpio",
+ .id = -1,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_GPIO,
+ }, {
+ .name = "usb-host",
+ .id = -1,
+ .parent = &clk_h,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_USBH,
+ }, {
+ .name = "usb-device",
+ .id = -1,
+ .parent = &clk_h,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_USBD,
+ }, {
+ .name = "timers",
+ .id = -1,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_PWMT,
+ }, {
+ .name = "uart",
+ .id = 0,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_UART0,
+ }, {
+ .name = "uart",
+ .id = 1,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_UART1,
+ }, {
+ .name = "uart",
+ .id = 2,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_UART2,
+ }, {
+ .name = "rtc",
+ .id = -1,
+ .parent = &clk_p,
+ .enable = s3c2410_clkcon_enable,
+ .ctrlbit = S3C2410_CLKCON_RTC,
+ }, {
+ .name = "watchdog",
+ .id = -1,
+ .parent = &clk_p,
+ .ctrlbit = 0,
+ }
+};
+
+/* s3c2410_baseclk_add()
+ *
+ * Add all the clocks used by the s3c2410 or compatible CPUs
+ * such as the S3C2440 and S3C2442.
+ *
+ * We cannot use a system device as we are needed before any
+ * of the init-calls that initialise the devices are actually
+ * done.
+*/
+
+int __init s3c2410_baseclk_add(void)
+{
+ unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW);
+ unsigned long clkcon = __raw_readl(S3C2410_CLKCON);
+ struct clk *clkp;
+ struct clk *xtal;
+ int ret;
+ int ptr;
+
+ clk_upll.enable = s3c2410_upll_enable;
+
+ if (s3c24xx_register_clock(&clk_usb_bus) < 0)
+ printk(KERN_ERR "failed to register usb bus clock\n");
+
+ /* register clocks from clock array */
+
+ clkp = init_clocks;
+ for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
+ /* ensure that we note the clock state */
+
+ clkp->usage = clkcon & clkp->ctrlbit ? 1 : 0;
+
+ ret = s3c24xx_register_clock(clkp);
+ if (ret < 0) {
+ printk(KERN_ERR "Failed to register clock %s (%d)\n",
+ clkp->name, ret);
+ }
+ }
+
+ /* We must be careful disabling the clocks we are not intending to
+ * be using at boot time, as subsytems such as the LCD which do
+ * their own DMA requests to the bus can cause the system to lockup
+ * if they where in the middle of requesting bus access.
+ *
+ * Disabling the LCD clock if the LCD is active is very dangerous,
+ * and therefore the bootloader should be careful to not enable
+ * the LCD clock if it is not needed.
+ */
+
+ /* install (and disable) the clocks we do not need immediately */
+
+ clkp = init_clocks_disable;
+ for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
+
+ ret = s3c24xx_register_clock(clkp);
+ if (ret < 0) {
+ printk(KERN_ERR "Failed to register clock %s (%d)\n",
+ clkp->name, ret);
+ }
+
+ s3c2410_clkcon_enable(clkp, 0);
+ }
+
+ /* show the clock-slow value */
+
+ xtal = clk_get(NULL, "xtal");
+
+ printk("CLOCK: Slow mode (%ld.%ld MHz), %s, MPLL %s, UPLL %s\n",
+ print_mhz(clk_get_rate(xtal) /
+ ( 2 * S3C2410_CLKSLOW_GET_SLOWVAL(clkslow))),
+ (clkslow & S3C2410_CLKSLOW_SLOW) ? "slow" : "fast",
+ (clkslow & S3C2410_CLKSLOW_MPLL_OFF) ? "off" : "on",
+ (clkslow & S3C2410_CLKSLOW_UCLK_OFF) ? "off" : "on");
+
+ return 0;
+}
*/
s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
+ s3c2410_baseclk_add();
}
struct sysdev_class s3c2410_sysclass = {
extern void s3c2410_init_clocks(int xtal);
+extern int s3c2410_baseclk_add(void);
+
#else
#define s3c2410_init_clocks NULL
#define s3c2410_init_uarts NULL
static struct clk s3c2440_clk_cam = {
.name = "camif",
.id = -1,
- .enable = s3c24xx_clkcon_enable,
+ .enable = s3c2410_clkcon_enable,
.ctrlbit = S3C2440_CLKCON_CAMERA,
};
static struct clk s3c2440_clk_ac97 = {
.name = "ac97",
.id = -1,
- .enable = s3c24xx_clkcon_enable,
+ .enable = s3c2410_clkcon_enable,
.ctrlbit = S3C2440_CLKCON_CAMERA,
};
static struct clk s3c2442_clk_cam = {
.name = "camif",
.id = -1,
- .enable = s3c24xx_clkcon_enable,
+ .enable = s3c2410_clkcon_enable,
.ctrlbit = S3C2440_CLKCON_CAMERA,
};
#include <asm/arch/regs-gpioj.h>
#include <asm/arch/regs-dsc.h>
+#include "s3c2410.h"
#include "s3c2440.h"
#include "s3c244x.h"
#include "clock.h"
*/
s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
+ s3c2410_baseclk_add();
}
#ifdef CONFIG_PM
projects / linux-2.6-omap-h63xx.git / commitdiff