[ARM] 3466/1: [2/3] Support for Philips PNX4008 platform: chip support

Patch from Vitaly Wool

This patch adds basic chip support for PNX4008 ARM platform.
It's basically the same as the previous one, but with the rmk's
comments taken into account.

Signed-off-by: Vitaly Wool <vwool@ru.mvista.com>
Signed-off-by: Dmitry Pervushin <dpervushin@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 1010 insertions, 0 deletions

diff --git a/arch/arm/mach-pnx4008/clock.c b/arch/arm/mach-pnx4008/clock.c
new file mode 100644
index 00000000000..285b22f631e
--- /dev/null
+++ b/arch/arm/mach-pnx4008/clock.c
@@ -0,0 +1,1010 @@
+/*
+ * arch/arm/mach-pnx4008/clock.c
+ *
+ * Clock control driver for PNX4008
+ *
+ * Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
+ * Generic clock management functions are partially based on:
+ *  linux/arch/arm/mach-omap/clock.c
+ *
+ * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+
+#include <asm/semaphore.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+
+#include <asm/arch/clock.h>
+#include "clock.h"
+
+/*forward declaration*/
+static struct clk per_ck;
+static struct clk hclk_ck;
+static struct clk ck_1MHz;
+static struct clk ck_13MHz;
+static struct clk ck_pll1;
+static int local_set_rate(struct clk *clk, u32 rate);
+
+static inline void clock_lock(void)
+{
+	local_irq_disable();
+}
+
+static inline void clock_unlock(void)
+{
+	local_irq_enable();
+}
+
+static void propagate_rate(struct clk *clk)
+{
+	struct clk *tmp_clk;
+
+	tmp_clk = clk;
+	while (tmp_clk->propagate_next) {
+		tmp_clk = tmp_clk->propagate_next;
+		local_set_rate(tmp_clk, tmp_clk->user_rate);
+	}
+}
+
+static inline void clk_reg_disable(struct clk *clk)
+{
+	if (clk->enable_reg)
+		__raw_writel(__raw_readl(clk->enable_reg) &
+			     ~(1 << clk->enable_shift), clk->enable_reg);
+}
+
+static inline void clk_reg_enable(struct clk *clk)
+{
+	if (clk->enable_reg)
+		__raw_writel(__raw_readl(clk->enable_reg) |
+			     (1 << clk->enable_shift), clk->enable_reg);
+}
+
+static inline void clk_reg_disable1(struct clk *clk)
+{
+	if (clk->enable_reg1)
+		__raw_writel(__raw_readl(clk->enable_reg1) &
+			     ~(1 << clk->enable_shift1), clk->enable_reg1);
+}
+
+static inline void clk_reg_enable1(struct clk *clk)
+{
+	if (clk->enable_reg1)
+		__raw_writel(__raw_readl(clk->enable_reg1) |
+			     (1 << clk->enable_shift1), clk->enable_reg1);
+}
+
+static int clk_wait_for_pll_lock(struct clk *clk)
+{
+	int i;
+	i = 0;
+	while (i++ < 0xFFF && !(__raw_readl(clk->scale_reg) & 1)) ;	/*wait for PLL to lock */
+
+	if (!(__raw_readl(clk->scale_reg) & 1)) {
+		printk(KERN_ERR
+		       "%s ERROR: failed to lock, scale reg data: %x\n",
+		       clk->name, __raw_readl(clk->scale_reg));
+		return -1;
+	}
+	return 0;
+}
+
+static int switch_to_dirty_13mhz(struct clk *clk)
+{
+	int i;
+	int ret;
+	u32 tmp_reg;
+
+	ret = 0;
+
+	if (!clk->rate)
+		clk_reg_enable1(clk);
+
+	tmp_reg = __raw_readl(clk->parent_switch_reg);
+	/*if 13Mhz clock selected, select 13'MHz (dirty) source from OSC */
+	if (!(tmp_reg & 1)) {
+		tmp_reg |= (1 << 1);	/* Trigger switch to 13'MHz (dirty) clock */
+		__raw_writel(tmp_reg, clk->parent_switch_reg);
+		i = 0;
+		while (i++ < 0xFFF && !(__raw_readl(clk->parent_switch_reg) & 1)) ;	/*wait for 13'MHz selection status */
+
+		if (!(__raw_readl(clk->parent_switch_reg) & 1)) {
+			printk(KERN_ERR
+			       "%s ERROR: failed to select 13'MHz, parent sw reg data: %x\n",
+			       clk->name, __raw_readl(clk->parent_switch_reg));
+			ret = -1;
+		}
+	}
+
+	if (!clk->rate)
+		clk_reg_disable1(clk);
+
+	return ret;
+}
+
+static int switch_to_clean_13mhz(struct clk *clk)
+{
+	int i;
+	int ret;
+	u32 tmp_reg;
+
+	ret = 0;
+
+	if (!clk->rate)
+		clk_reg_enable1(clk);
+
+	tmp_reg = __raw_readl(clk->parent_switch_reg);
+	/*if 13'Mhz clock selected, select 13MHz (clean) source from OSC */
+	if (tmp_reg & 1) {
+		tmp_reg &= ~(1 << 1);	/* Trigger switch to 13MHz (clean) clock */
+		__raw_writel(tmp_reg, clk->parent_switch_reg);
+		i = 0;
+		while (i++ < 0xFFF && (__raw_readl(clk->parent_switch_reg) & 1)) ;	/*wait for 13MHz selection status */
+
+		if (__raw_readl(clk->parent_switch_reg) & 1) {
+			printk(KERN_ERR
+			       "%s ERROR: failed to select 13MHz, parent sw reg data: %x\n",
+			       clk->name, __raw_readl(clk->parent_switch_reg));
+			ret = -1;
+		}
+	}
+
+	if (!clk->rate)
+		clk_reg_disable1(clk);
+
+	return ret;
+}
+
+static int set_13MHz_parent(struct clk *clk, struct clk *parent)
+{
+	int ret = -EINVAL;
+
+	if (parent == &ck_13MHz)
+		ret = switch_to_clean_13mhz(clk);
+	else if (parent == &ck_pll1)
+		ret = switch_to_dirty_13mhz(clk);
+
+	return ret;
+}
+
+#define PLL160_MIN_FCCO 156000
+#define PLL160_MAX_FCCO 320000
+
+/*
+ * Calculate pll160 settings.
+ * Possible input: up to 320MHz with step of clk->parent->rate.
+ * In PNX4008 parent rate for pll160s may be either 1 or 13MHz.
+ * Ignored paths: "feedback" (bit 13 set), "div-by-N".
+ * Setting ARM PLL4 rate to 0 will put CPU into direct run mode.
+ * Setting PLL5 and PLL3 rate to 0 will disable USB and DSP clock input.
+ * Please refer to PNX4008 IC manual for details.
+ */
+
+static int pll160_set_rate(struct clk *clk, u32 rate)
+{
+	u32 tmp_reg, tmp_m, tmp_2p, i;
+	u32 parent_rate;
+	int ret = -EINVAL;
+
+	parent_rate = clk->parent->rate;
+
+	if (!parent_rate)
+		goto out;
+
+	/* set direct run for ARM or disable output for others  */
+	clk_reg_disable(clk);
+
+	/* disable source input as well (ignored for ARM) */
+	clk_reg_disable1(clk);
+
+	tmp_reg = __raw_readl(clk->scale_reg);
+	tmp_reg &= ~0x1ffff;	/*clear all settings, power down */
+	__raw_writel(tmp_reg, clk->scale_reg);
+
+	rate -= rate % parent_rate;	/*round down the input */
+
+	if (rate > PLL160_MAX_FCCO)
+		rate = PLL160_MAX_FCCO;
+
+	if (!rate) {
+		clk->rate = 0;
+		ret = 0;
+		goto out;
+	}
+
+	clk_reg_enable1(clk);
+	tmp_reg = __raw_readl(clk->scale_reg);
+
+	if (rate == parent_rate) {
+		/*enter direct bypass mode */
+		tmp_reg |= ((1 << 14) | (1 << 15));
+		__raw_writel(tmp_reg, clk->scale_reg);
+		clk->rate = parent_rate;
+		clk_reg_enable(clk);
+		ret = 0;
+		goto out;
+	}
+
+	i = 0;
+	for (tmp_2p = 1; tmp_2p < 16; tmp_2p <<= 1) {
+		if (rate * tmp_2p >= PLL160_MIN_FCCO)
+			break;
+		i++;
+	}
+
+	if (tmp_2p > 1)
+		tmp_reg |= ((i - 1) << 11);
+	else
+		tmp_reg |= (1 << 14);	/*direct mode, no divide */
+
+	tmp_m = rate * tmp_2p;
+	tmp_m /= parent_rate;
+
+	tmp_reg |= (tmp_m - 1) << 1;	/*calculate M */
+	tmp_reg |= (1 << 16);	/*power up PLL */
+	__raw_writel(tmp_reg, clk->scale_reg);
+
+	if (clk_wait_for_pll_lock(clk) < 0) {
+		clk_reg_disable(clk);
+		clk_reg_disable1(clk);
+
+		tmp_reg = __raw_readl(clk->scale_reg);
+		tmp_reg &= ~0x1ffff;	/*clear all settings, power down */
+		__raw_writel(tmp_reg, clk->scale_reg);
+		clk->rate = 0;
+		ret = -EFAULT;
+		goto out;
+	}
+
+	clk->rate = (tmp_m * parent_rate) / tmp_2p;
+
+	if (clk->flags & RATE_PROPAGATES)
+		propagate_rate(clk);
+
+	clk_reg_enable(clk);
+	ret = 0;
+
+out:
+	return ret;
+}
+
+/*configure PER_CLK*/
+static int per_clk_set_rate(struct clk *clk, u32 rate)
+{
+	u32 tmp;
+
+	tmp = __raw_readl(clk->scale_reg);
+	tmp &= ~(0x1f << 2);
+	tmp |= ((clk->parent->rate / clk->rate) - 1) << 2;
+	__raw_writel(tmp, clk->scale_reg);
+	clk->rate = rate;
+	return 0;
+}
+
+/*configure HCLK*/
+static int hclk_set_rate(struct clk *clk, u32 rate)
+{
+	u32 tmp;
+	tmp = __raw_readl(clk->scale_reg);
+	tmp = tmp & ~0x3;
+	switch (rate) {
+	case 1:
+		break;
+	case 2:
+		tmp |= 1;
+		break;
+	case 4:
+		tmp |= 2;
+		break;
+	}
+
+	__raw_writel(tmp, clk->scale_reg);
+	clk->rate = rate;
+	return 0;
+}
+
+static u32 hclk_round_rate(struct clk *clk, u32 rate)
+{
+	switch (rate) {
+	case 1:
+	case 4:
+		return rate;
+	}
+	return 2;
+}
+
+static u32 per_clk_round_rate(struct clk *clk, u32 rate)
+{
+	return CLK_RATE_13MHZ;
+}
+
+static int on_off_set_rate(struct clk *clk, u32 rate)
+{
+	if (rate) {
+		clk_reg_enable(clk);
+		clk->rate = 1;
+	} else {
+		clk_reg_disable(clk);
+		clk->rate = 0;
+	}
+	return 0;
+}
+
+static int on_off_inv_set_rate(struct clk *clk, u32 rate)
+{
+	if (rate) {
+		clk_reg_disable(clk);	/*enable bit is inverted */
+		clk->rate = 1;
+	} else {
+		clk_reg_enable(clk);
+		clk->rate = 0;
+	}
+	return 0;
+}
+
+static u32 on_off_round_rate(struct clk *clk, u32 rate)
+{
+	return (rate ? 1 : 0);
+}
+
+static u32 pll4_round_rate(struct clk *clk, u32 rate)
+{
+	if (rate > CLK_RATE_208MHZ)
+		rate = CLK_RATE_208MHZ;
+	if (rate == CLK_RATE_208MHZ && hclk_ck.user_rate == 1)
+		rate = CLK_RATE_208MHZ - CLK_RATE_13MHZ;
+	return (rate - (rate % (hclk_ck.user_rate * CLK_RATE_13MHZ)));
+}
+
+static u32 pll3_round_rate(struct clk *clk, u32 rate)
+{
+	if (rate > CLK_RATE_208MHZ)
+		rate = CLK_RATE_208MHZ;
+	return (rate - rate % CLK_RATE_13MHZ);
+}
+
+static u32 pll5_round_rate(struct clk *clk, u32 rate)
+{
+	return (rate ? CLK_RATE_48MHZ : 0);
+}
+
+static u32 ck_13MHz_round_rate(struct clk *clk, u32 rate)
+{
+	return (rate ? CLK_RATE_13MHZ : 0);
+}
+
+static int ck_13MHz_set_rate(struct clk *clk, u32 rate)
+{
+	if (rate) {
+		clk_reg_disable(clk);	/*enable bit is inverted */
+		udelay(500);
+		clk->rate = CLK_RATE_13MHZ;
+		ck_1MHz.rate = CLK_RATE_1MHZ;
+	} else {
+		clk_reg_enable(clk);
+		clk->rate = 0;
+		ck_1MHz.rate = 0;
+	}
+	return 0;
+}
+
+static int pll1_set_rate(struct clk *clk, u32 rate)
+{
+#if 0 /* doesn't work on some boards, probably a HW BUG */
+	if (rate) {
+		clk_reg_disable(clk);	/*enable bit is inverted */
+		if (!clk_wait_for_pll_lock(clk)) {
+			clk->rate = CLK_RATE_13MHZ;
+		} else {
+			clk_reg_enable(clk);
+			clk->rate = 0;
+		}
+
+	} else {
+		clk_reg_enable(clk);
+		clk->rate = 0;
+	}
+#endif
+	return 0;
+}
+
+/* Clock sources */
+
+static struct clk osc_13MHz = {
+	.name = "osc_13MHz",
+	.flags = FIXED_RATE,
+	.rate = CLK_RATE_13MHZ,
+};
+
+static struct clk ck_13MHz = {
+	.name = "ck_13MHz",
+	.parent = &osc_13MHz,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &ck_13MHz_round_rate,
+	.set_rate = &ck_13MHz_set_rate,
+	.enable_reg = OSC13CTRL_REG,
+	.enable_shift = 0,
+	.rate = CLK_RATE_13MHZ,
+};
+
+static struct clk osc_32KHz = {
+	.name = "osc_32KHz",
+	.flags = FIXED_RATE,
+	.rate = CLK_RATE_32KHZ,
+};
+
+/*attached to PLL5*/
+static struct clk ck_1MHz = {
+	.name = "ck_1MHz",
+	.flags = FIXED_RATE | PARENT_SET_RATE,
+	.parent = &ck_13MHz,
+};
+
+/* PLL1 (397) - provides 13' MHz clock */
+static struct clk ck_pll1 = {
+	.name = "ck_pll1",
+	.parent = &osc_32KHz,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &ck_13MHz_round_rate,
+	.set_rate = &pll1_set_rate,
+	.enable_reg = PLLCTRL_REG,
+	.enable_shift = 1,
+	.scale_reg = PLLCTRL_REG,
+	.rate = CLK_RATE_13MHZ,
+};
+
+/* CPU/Bus PLL */
+static struct clk ck_pll4 = {
+	.name = "ck_pll4",
+	.parent = &ck_pll1,
+	.flags = RATE_PROPAGATES | NEEDS_INITIALIZATION,
+	.propagate_next = &per_ck,
+	.round_rate = &pll4_round_rate,
+	.set_rate = &pll160_set_rate,
+	.rate = CLK_RATE_208MHZ,
+	.scale_reg = HCLKPLLCTRL_REG,
+	.enable_reg = PWRCTRL_REG,
+	.enable_shift = 2,
+	.parent_switch_reg = SYSCLKCTRL_REG,
+	.set_parent = &set_13MHz_parent,
+};
+
+/* USB PLL */
+static struct clk ck_pll5 = {
+	.name = "ck_pll5",
+	.parent = &ck_1MHz,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &pll5_round_rate,
+	.set_rate = &pll160_set_rate,
+	.scale_reg = USBCTRL_REG,
+	.enable_reg = USBCTRL_REG,
+	.enable_shift = 18,
+	.enable_reg1 = USBCTRL_REG,
+	.enable_shift1 = 17,
+};
+
+/* XPERTTeak DSP PLL */
+static struct clk ck_pll3 = {
+	.name = "ck_pll3",
+	.parent = &ck_pll1,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &pll3_round_rate,
+	.set_rate = &pll160_set_rate,
+	.scale_reg = DSPPLLCTRL_REG,
+	.enable_reg = DSPCLKCTRL_REG,
+	.enable_shift = 3,
+	.enable_reg1 = DSPCLKCTRL_REG,
+	.enable_shift1 = 2,
+	.parent_switch_reg = DSPCLKCTRL_REG,
+	.set_parent = &set_13MHz_parent,
+};
+
+static struct clk hclk_ck = {
+	.name = "hclk_ck",
+	.parent = &ck_pll4,
+	.flags = PARENT_SET_RATE,
+	.set_rate = &hclk_set_rate,
+	.round_rate = &hclk_round_rate,
+	.scale_reg = HCLKDIVCTRL_REG,
+	.rate = 2,
+	.user_rate = 2,
+};
+
+static struct clk per_ck = {
+	.name = "per_ck",
+	.parent = &ck_pll4,
+	.flags = FIXED_RATE,
+	.propagate_next = &hclk_ck,
+	.set_rate = &per_clk_set_rate,
+	.round_rate = &per_clk_round_rate,
+	.scale_reg = HCLKDIVCTRL_REG,
+	.rate = CLK_RATE_13MHZ,
+	.user_rate = CLK_RATE_13MHZ,
+};
+
+static struct clk m2hclk_ck = {
+	.name = "m2hclk_ck",
+	.parent = &hclk_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_inv_set_rate,
+	.rate = 1,
+	.enable_shift = 6,
+	.enable_reg = PWRCTRL_REG,
+};
+
+static struct clk vfp9_ck = {
+	.name = "vfp9_ck",
+	.parent = &ck_pll4,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.rate = 1,
+	.enable_shift = 4,
+	.enable_reg = VFP9CLKCTRL_REG,
+};
+
+static struct clk keyscan_ck = {
+	.name = "keyscan_ck",
+	.parent = &osc_32KHz,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 0,
+	.enable_reg = KEYCLKCTRL_REG,
+};
+
+static struct clk touch_ck = {
+	.name = "touch_ck",
+	.parent = &osc_32KHz,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 0,
+	.enable_reg = TSCLKCTRL_REG,
+};
+
+static struct clk pwm1_ck = {
+	.name = "pwm1_ck",
+	.parent = &osc_32KHz,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 0,
+	.enable_reg = PWMCLKCTRL_REG,
+};
+
+static struct clk pwm2_ck = {
+	.name = "pwm2_ck",
+	.parent = &osc_32KHz,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 2,
+	.enable_reg = PWMCLKCTRL_REG,
+};
+
+static struct clk jpeg_ck = {
+	.name = "jpeg_ck",
+	.parent = &hclk_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 0,
+	.enable_reg = JPEGCLKCTRL_REG,
+};
+
+static struct clk ms_ck = {
+	.name = "ms_ck",
+	.parent = &ck_pll4,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 5,
+	.enable_reg = MSCTRL_REG,
+};
+
+static struct clk dum_ck = {
+	.name = "dum_ck",
+	.parent = &hclk_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 0,
+	.enable_reg = DUMCLKCTRL_REG,
+};
+
+static struct clk flash_ck = {
+	.name = "flash_ck",
+	.parent = &hclk_ck,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 1,	/* Only MLC clock supported */
+	.enable_reg = FLASHCLKCTRL_REG,
+};
+
+static struct clk i2c0_ck = {
+	.name = "i2c0_ck",
+	.parent = &per_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 0,
+	.enable_reg = I2CCLKCTRL_REG,
+};
+
+static struct clk i2c1_ck = {
+	.name = "i2c1_ck",
+	.parent = &per_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 1,
+	.enable_reg = I2CCLKCTRL_REG,
+};
+
+static struct clk i2c2_ck = {
+	.name = "i2c2_ck",
+	.parent = &per_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 2,
+	.enable_reg = USB_OTG_CLKCTRL_REG,
+};
+
+static struct clk spi0_ck = {
+	.name = "spi0_ck",
+	.parent = &hclk_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 0,
+	.enable_reg = SPICTRL_REG,
+};
+
+static struct clk spi1_ck = {
+	.name = "spi1_ck",
+	.parent = &hclk_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 4,
+	.enable_reg = SPICTRL_REG,
+};
+
+static struct clk dma_ck = {
+	.name = "dma_ck",
+	.parent = &hclk_ck,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 0,
+	.enable_reg = DMACLKCTRL_REG,
+};
+
+static struct clk uart3_ck = {
+	.name = "uart3_ck",
+	.parent = &per_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.rate = 1,
+	.enable_shift = 0,
+	.enable_reg = UARTCLKCTRL_REG,
+};
+
+static struct clk uart4_ck = {
+	.name = "uart4_ck",
+	.parent = &per_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 1,
+	.enable_reg = UARTCLKCTRL_REG,
+};
+
+static struct clk uart5_ck = {
+	.name = "uart5_ck",
+	.parent = &per_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.rate = 1,
+	.enable_shift = 2,
+	.enable_reg = UARTCLKCTRL_REG,
+};
+
+static struct clk uart6_ck = {
+	.name = "uart6_ck",
+	.parent = &per_ck,
+	.flags = NEEDS_INITIALIZATION,
+	.round_rate = &on_off_round_rate,
+	.set_rate = &on_off_set_rate,
+	.enable_shift = 3,
+	.enable_reg = UARTCLKCTRL_REG,
+};
+
+/* These clocks are visible outside this module
+ * and can be initialized
+ */
+static struct clk *onchip_clks[] = {
+	&ck_13MHz,
+	&ck_pll1,
+	&ck_pll4,
+	&ck_pll5,
+	&ck_pll3,
+	&vfp9_ck,
+	&m2hclk_ck,
+	&hclk_ck,
+	&dma_ck,
+	&flash_ck,
+	&dum_ck,
+	&keyscan_ck,
+	&pwm1_ck,
+	&pwm2_ck,
+	&jpeg_ck,
+	&ms_ck,
+	&touch_ck,
+	&i2c0_ck,
+	&i2c1_ck,
+	&i2c2_ck,
+	&spi0_ck,
+	&spi1_ck,
+	&uart3_ck,
+	&uart4_ck,
+	&uart5_ck,
+	&uart6_ck,
+};
+
+static int local_set_rate(struct clk *clk, u32 rate)
+{
+	int ret = -EINVAL;
+	if (clk->set_rate) {
+
+		if (clk->user_rate == clk->rate && clk->parent->rate) {
+			/* if clock enabled or rate not set */
+			clk->user_rate = clk->round_rate(clk, rate);
+			ret = clk->set_rate(clk, clk->user_rate);
+		} else
+			clk->user_rate = clk->round_rate(clk, rate);
+		ret = 0;
+	}
+	return ret;
+}
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	int ret = -EINVAL;
+
+	if (clk->flags & FIXED_RATE)
+		goto out;
+
+	clock_lock();
+	if ((clk->flags & PARENT_SET_RATE) && clk->parent) {
+
+		clk->user_rate = clk->round_rate(clk, rate);
+		/* parent clock needs to be refreshed
+		   for the setting to take effect */
+	} else {
+		ret = local_set_rate(clk, rate);
+	}
+	ret = 0;
+	clock_unlock();
+
+out:
+	return ret;
+}
+
+EXPORT_SYMBOL(clk_set_rate);
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+	struct clk *clk = ERR_PTR(-ENOENT);
+	struct clk **clkp;
+
+	clock_lock();
+	for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
+	     clkp++) {
+		if (strcmp(id, (*clkp)->name) == 0
+		    && try_module_get((*clkp)->owner)) {
+			clk = (*clkp);
+			break;
+		}
+	}
+	clock_unlock();
+
+	return clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+	clock_lock();
+	if (clk && !IS_ERR(clk))
+		module_put(clk->owner);
+	clock_unlock();
+}
+EXPORT_SYMBOL(clk_put);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	unsigned long ret;
+	clock_lock();
+	ret = clk->rate;
+	clock_unlock();
+	return ret;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+static int local_clk_enable(struct clk *clk)
+{
+	int ret = 0;
+
+	if (!(clk->flags & FIXED_RATE) && !clk->rate && clk->set_rate
+	    && clk->user_rate)
+		ret = clk->set_rate(clk, clk->user_rate);
+	return ret;
+}
+
+static void local_clk_disable(struct clk *clk)
+{
+	if (!(clk->flags & FIXED_RATE) && clk->rate && clk->set_rate)
+		clk->set_rate(clk, 0);
+}
+
+int clk_enable(struct clk *clk)
+{
+	int ret = 0;
+
+	clock_lock();
+	ret = local_clk_enable(clk);
+	clock_unlock();
+	return ret;
+}
+
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+	clock_lock();
+	local_clk_disable(clk);
+	clock_unlock();
+}
+
+EXPORT_SYMBOL(clk_disable);
+
+static void local_clk_unuse(struct clk *clk)
+{
+	if (clk->usecount > 0 && !(--clk->usecount)) {
+		local_clk_disable(clk);
+		if (clk->parent)
+			local_clk_unuse(clk->parent);
+	}
+}
+
+static int local_clk_use(struct clk *clk)
+{
+	int ret = 0;
+	if (clk->usecount++ == 0) {
+		if (clk->parent)
+			ret = local_clk_use(clk->parent);
+
+		if (ret != 0) {
+			clk->usecount--;
+			goto out;
+		}
+
+		ret = local_clk_enable(clk);
+
+		if (ret != 0 && clk->parent) {
+			local_clk_unuse(clk->parent);
+			clk->usecount--;
+		}
+	}
+out:
+	return ret;
+}
+
+/* The main purpose of clk_use ans clk_unuse functions
+ * is to control switching 13MHz oscillator and PLL1 (13'MHz),
+ * so that they are disabled whenever none of PLL2-5 is using them.
+ * Although in theory these functions should work with any clock,
+ * please use them only on PLL2 - PLL5 to avoid confusion.
+ */
+int clk_use(struct clk *clk)
+{
+	int ret = 0;
+
+	clock_lock();
+	ret = local_clk_use(clk);
+	clock_unlock();
+	return ret;
+}
+EXPORT_SYMBOL(clk_use);
+
+void clk_unuse(struct clk *clk)
+{
+
+	clock_lock();
+	local_clk_unuse(clk);
+	clock_unlock();
+}
+
+EXPORT_SYMBOL(clk_unuse);
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+	long ret;
+	clock_lock();
+	if (clk->round_rate)
+		ret = clk->round_rate(clk, rate);
+	else
+		ret = clk->rate;
+	clock_unlock();
+	return ret;
+}
+
+EXPORT_SYMBOL(clk_round_rate);
+
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	int ret = -ENODEV;
+	if (!clk->set_parent)
+		goto out;
+
+	clock_lock();
+	ret = clk->set_parent(clk, parent);
+	if (!ret)
+		clk->parent = parent;
+	clock_unlock();
+
+out:
+	return ret;
+}
+
+EXPORT_SYMBOL(clk_set_parent);
+
+static int __init clk_init(void)
+{
+	struct clk **clkp;
+
+	/* Disable autoclocking, as it doesn't seem to work */
+	__raw_writel(0xff, AUTOCLK_CTRL);
+
+	for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
+	     clkp++) {
+		if (((*clkp)->flags & NEEDS_INITIALIZATION)
+		    && ((*clkp)->set_rate)) {
+			(*clkp)->user_rate = (*clkp)->rate;
+			local_set_rate((*clkp), (*clkp)->user_rate);
+			if ((*clkp)->set_parent)
+				(*clkp)->set_parent((*clkp), (*clkp)->parent);
+		}
+		pr_debug("%s: clock %s, rate %ld\n",
+			__FUNCTION__, (*clkp)->name, (*clkp)->rate);
+	}
+
+	clk_use(&ck_pll4);
+
+	/* if ck_13MHz is not used, disable it. */
+	if (ck_13MHz.usecount == 0)
+		local_clk_disable(&ck_13MHz);
+
+	/* Disable autoclocking */
+	__raw_writeb(0xff, AUTOCLK_CTRL);
+
+	return 0;
+}
+
+arch_initcall(clk_init);