Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 507 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/clock.c b/arch/arm/mach-s3c2410/clock.c
new file mode 100644
index 000000000000..e23f534d4e1d
--- /dev/null
+++ b/arch/arm/mach-s3c2410/clock.c
@@ -0,0 +1,507 @@
+/* linux/arch/arm/mach-s3c2410/clock.c
+ *
+ * Copyright (c) 2004-2005 Simtec Electronics
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2410 Clock control support
+ *
+ * Based on, and code from linux/arch/arm/mach-versatile/clock.c
+ **
+ **  Copyright (C) 2004 ARM Limited.
+ **  Written by Deep Blue Solutions Limited.
+ *
+ *
+ * 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/device.h>
+#include <linux/sysdev.h>
+
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+
+#include <asm/hardware.h>
+#include <asm/atomic.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include <asm/hardware/clock.h>
+#include <asm/arch/regs-clock.h>
+
+#include "clock.h"
+#include "cpu.h"
+
+/* clock information */
+
+static LIST_HEAD(clocks);
+static DECLARE_MUTEX(clocks_sem);
+
+/* old functions */
+
+void inline s3c24xx_clk_enable(unsigned int clocks, unsigned int enable)
+{
+	unsigned long clkcon;
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	clkcon = __raw_readl(S3C2410_CLKCON);
+	clkcon &= ~clocks;
+
+	if (enable)
+		clkcon |= clocks;
+
+	/* ensure none of the special function bits set */
+	clkcon &= ~(S3C2410_CLKCON_IDLE|S3C2410_CLKCON_POWER);
+
+	__raw_writel(clkcon, S3C2410_CLKCON);
+
+	local_irq_restore(flags);
+}
+
+/* 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)
+{
+	struct clk *p;
+	struct clk *clk = ERR_PTR(-ENOENT);
+	int idno;
+
+	idno = (dev == NULL) ? -1 : to_platform_device(dev)->id;
+
+	down(&clocks_sem);
+
+	list_for_each_entry(p, &clocks, list) {
+		if (p->id == idno &&
+		    strcmp(id, p->name) == 0 &&
+		    try_module_get(p->owner)) {
+			clk = p;
+			break;
+		}
+	}
+
+	/* check for the case where a device was supplied, but the
+	 * clock that was being searched for is not device specific */
+
+	if (IS_ERR(clk)) {
+		list_for_each_entry(p, &clocks, list) {
+			if (p->id == -1 && strcmp(id, p->name) == 0 &&
+			    try_module_get(p->owner)) {
+				clk = p;
+				break;
+			}
+		}
+	}
+
+	up(&clocks_sem);
+	return clk;
+}
+
+void clk_put(struct clk *clk)
+{
+	module_put(clk->owner);
+}
+
+int clk_enable(struct clk *clk)
+{
+	if (IS_ERR(clk))
+		return -EINVAL;
+
+	return (clk->enable)(clk, 1);
+}
+
+void clk_disable(struct clk *clk)
+{
+	if (!IS_ERR(clk))
+		(clk->enable)(clk, 0);
+}
+
+
+int clk_use(struct clk *clk)
+{
+	atomic_inc(&clk->used);
+	return 0;
+}
+
+
+void clk_unuse(struct clk *clk)
+{
+	atomic_dec(&clk->used);
+}
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	if (IS_ERR(clk))
+		return 0;
+
+	if (clk->rate != 0)
+		return clk->rate;
+
+	while (clk->parent != NULL && clk->rate == 0)
+		clk = clk->parent;
+
+	return clk->rate;
+}
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+	return rate;
+}
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	return -EINVAL;
+}
+
+struct clk *clk_get_parent(struct clk *clk)
+{
+	return clk->parent;
+}
+
+EXPORT_SYMBOL(clk_get);
+EXPORT_SYMBOL(clk_put);
+EXPORT_SYMBOL(clk_enable);
+EXPORT_SYMBOL(clk_disable);
+EXPORT_SYMBOL(clk_use);
+EXPORT_SYMBOL(clk_unuse);
+EXPORT_SYMBOL(clk_get_rate);
+EXPORT_SYMBOL(clk_round_rate);
+EXPORT_SYMBOL(clk_set_rate);
+EXPORT_SYMBOL(clk_get_parent);
+
+/* base clocks */
+
+static struct clk clk_xtal = {
+	.name		= "xtal",
+	.id		= -1,
+	.rate		= 0,
+	.parent		= NULL,
+	.ctrlbit	= 0,
+};
+
+static struct clk clk_f = {
+	.name		= "fclk",
+	.id		= -1,
+	.rate		= 0,
+	.parent		= NULL,
+	.ctrlbit	= 0,
+};
+
+static struct clk clk_h = {
+	.name		= "hclk",
+	.id		= -1,
+	.rate		= 0,
+	.parent		= NULL,
+	.ctrlbit	= 0,
+};
+
+static struct clk clk_p = {
+	.name		= "pclk",
+	.id		= -1,
+	.rate		= 0,
+	.parent		= NULL,
+	.ctrlbit	= 0,
+};
+
+/* clocks that could be registered by external code */
+
+struct clk s3c24xx_dclk0 = {
+	.name		= "dclk0",
+	.id		= -1,
+};
+
+struct clk s3c24xx_dclk1 = {
+	.name		= "dclk1",
+	.id		= -1,
+};
+
+struct clk s3c24xx_clkout0 = {
+	.name		= "clkout0",
+	.id		= -1,
+};
+
+struct clk s3c24xx_clkout1 = {
+	.name		= "clkout1",
+	.id		= -1,
+};
+
+struct clk s3c24xx_uclk = {
+	.name		= "uclk",
+	.id		= -1,
+};
+
+
+/* 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)
+{
+	clk->owner = THIS_MODULE;
+	atomic_set(&clk->used, 0);
+
+	if (clk->enable == NULL)
+		clk->enable = clk_null_enable;
+
+	/* add to the list of available clocks */
+
+	down(&clocks_sem);
+	list_add(&clk->list, &clocks);
+	up(&clocks_sem);
+
+	return 0;
+}
+
+/* initalise all the clocks */
+
+int __init s3c24xx_setup_clocks(unsigned long xtal,
+				unsigned long fclk,
+				unsigned long hclk,
+				unsigned long pclk)
+{
+	struct clk *clkp = init_clocks;
+	int ptr;
+	int ret;
+
+	printk(KERN_INFO "S3C2410 Clocks, (c) 2004 Simtec Electronics\n");
+
+	/* initialise the main system clocks */
+
+	clk_xtal.rate = xtal;
+
+	clk_h.rate = hclk;
+	clk_p.rate = pclk;
+	clk_f.rate = fclk;
+
+	/* it looks like just setting the register here is not good
+	 * enough, and causes the odd hang at initial boot time, so
+	 * do all of them indivdually.
+	 *
+	 * I think 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.
+	 *
+	 * and of course, this looks neater
+	 */
+
+	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);
+
+	/* assume uart clocks are correctly setup */
+
+	/* register our clocks */
+
+	if (s3c24xx_register_clock(&clk_xtal) < 0)
+		printk(KERN_ERR "failed to register master xtal\n");
+
+	if (s3c24xx_register_clock(&clk_f) < 0)
+		printk(KERN_ERR "failed to register cpu fclk\n");
+
+	if (s3c24xx_register_clock(&clk_h) < 0)
+		printk(KERN_ERR "failed to register cpu hclk\n");
+
+	if (s3c24xx_register_clock(&clk_p) < 0)
+		printk(KERN_ERR "failed to register cpu pclk\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);
+		}
+	}
+
+	return 0;
+}
+
+/* S3C2440 extended clock support */
+
+#ifdef CONFIG_CPU_S3C2440
+
+static struct clk s3c2440_clk_upll = {
+	.name		= "upll",
+	.id		= -1,
+};
+
+static struct clk s3c2440_clk_cam = {
+	.name		= "camif",
+	.parent		= &clk_h,
+	.id		= -1,
+	.enable		= s3c24xx_clkcon_enable,
+	.ctrlbit	= S3C2440_CLKCON_CAMERA,
+};
+
+static struct clk s3c2440_clk_ac97 = {
+	.name		= "ac97",
+	.parent		= &clk_p,
+	.id		= -1,
+	.enable		= s3c24xx_clkcon_enable,
+	.ctrlbit	= S3C2440_CLKCON_CAMERA,
+};
+
+static int s3c2440_clk_add(struct sys_device *sysdev)
+{
+	unsigned long upllcon = __raw_readl(S3C2410_UPLLCON);
+
+	s3c2440_clk_upll.rate = s3c2410_get_pll(upllcon, clk_xtal.rate) * 2;
+
+	printk("S3C2440: Clock Support, UPLL %ld.%03ld MHz\n",
+	       print_mhz(s3c2440_clk_upll.rate));
+
+	s3c24xx_register_clock(&s3c2440_clk_ac97);
+	s3c24xx_register_clock(&s3c2440_clk_cam);
+	s3c24xx_register_clock(&s3c2440_clk_upll);
+
+	clk_disable(&s3c2440_clk_ac97);
+	clk_disable(&s3c2440_clk_cam);
+
+	return 0;
+}
+
+static struct sysdev_driver s3c2440_clk_driver = {
+	.add	= s3c2440_clk_add,
+};
+
+static int s3c24xx_clk_driver(void)
+{
+	return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver);
+}
+
+arch_initcall(s3c24xx_clk_driver);
+
+#endif /* CONFIG_CPU_S3C2440 */