[PATCH] ARM: 2809/1: OMAP update 7b/11: Move arch-omap to plat-omap

Patch from Tony Lindgren

This patch move common OMAP code from arch-omap to plat-omap
directory.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 1188 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
new file mode 100644
index 0000000..155157f
--- /dev/null
+++ b/arch/arm/plat-omap/clock.c
@@ -0,0 +1,1076 @@
+/*
+ *  linux/arch/arm/plat-omap/clock.c
+ *
+ *  Copyright (C) 2004 Nokia corporation
+ *  Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+
+#include <asm/semaphore.h>
+#include <asm/hardware/clock.h>
+#include <asm/arch/board.h>
+#include <asm/arch/usb.h>
+
+#include "clock.h"
+
+static LIST_HEAD(clocks);
+static DECLARE_MUTEX(clocks_sem);
+static DEFINE_SPINLOCK(clockfw_lock);
+static void propagate_rate(struct clk *  clk);
+/* External clock (MCLK & BCLK) functions */
+static int set_ext_clk_rate(struct clk *  clk, unsigned long rate);
+static long round_ext_clk_rate(struct clk *  clk, unsigned long rate);
+static void init_ext_clk(struct clk *  clk);
+/* MPU virtual clock functions */
+static int select_table_rate(struct clk *  clk, unsigned long rate);
+static long round_to_table_rate(struct clk *  clk, unsigned long rate);
+void clk_setdpll(__u16, __u16);
+
+struct mpu_rate rate_table[] = {
+	/* MPU MHz, xtal MHz, dpll1 MHz, CKCTL, DPLL_CTL
+	 * armdiv, dspdiv, dspmmu, tcdiv, perdiv, lcddiv
+	 */
+#if defined(CONFIG_OMAP_ARM_216MHZ)
+	{ 216000000, 12000000, 216000000, 0x050d, 0x2910 }, /* 1/1/2/2/2/8 */
+#endif
+#if defined(CONFIG_OMAP_ARM_195MHZ)
+	{ 195000000, 13000000, 195000000, 0x050e, 0x2790 }, /* 1/1/2/2/4/8 */
+#endif
+#if defined(CONFIG_OMAP_ARM_192MHZ)
+	{ 192000000, 19200000, 192000000, 0x050f, 0x2510 }, /* 1/1/2/2/8/8 */
+	{ 192000000, 12000000, 192000000, 0x050f, 0x2810 }, /* 1/1/2/2/8/8 */
+	{  96000000, 12000000, 192000000, 0x055f, 0x2810 }, /* 2/2/2/2/8/8 */
+	{  48000000, 12000000, 192000000, 0x0ccf, 0x2810 }, /* 4/4/4/4/8/8 */
+	{  24000000, 12000000, 192000000, 0x0fff, 0x2810 }, /* 8/8/8/8/8/8 */
+#endif
+#if defined(CONFIG_OMAP_ARM_182MHZ)
+	{ 182000000, 13000000, 182000000, 0x050e, 0x2710 }, /* 1/1/2/2/4/8 */
+#endif
+#if defined(CONFIG_OMAP_ARM_168MHZ)
+	{ 168000000, 12000000, 168000000, 0x010f, 0x2710 }, /* 1/1/1/2/8/8 */
+#endif
+#if defined(CONFIG_OMAP_ARM_150MHZ)
+	{ 150000000, 12000000, 150000000, 0x150a, 0x2cb0 }, /* 0/0/1/1/2/2 */
+#endif
+#if defined(CONFIG_OMAP_ARM_120MHZ)
+	{ 120000000, 12000000, 120000000, 0x010a, 0x2510 }, /* 1/1/1/2/4/4 */
+#endif
+#if defined(CONFIG_OMAP_ARM_96MHZ)
+	{  96000000, 12000000,  96000000, 0x0005, 0x2410 }, /* 1/1/1/1/2/2 */
+#endif
+#if defined(CONFIG_OMAP_ARM_60MHZ)
+	{  60000000, 12000000,  60000000, 0x0005, 0x2290 }, /* 1/1/1/1/2/2 */
+#endif
+#if defined(CONFIG_OMAP_ARM_30MHZ)
+	{  30000000, 12000000,  60000000, 0x0555, 0x2290 }, /* 2/2/2/2/2/2 */
+#endif
+	{ 0, 0, 0, 0, 0 },
+};
+
+
+static void ckctl_recalc(struct clk *  clk)
+{
+	int dsor;
+
+	/* Calculate divisor encoded as 2-bit exponent */
+	dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
+	if (unlikely(clk->rate == clk->parent->rate / dsor))
+		return; /* No change, quick exit */
+	clk->rate = clk->parent->rate / dsor;
+
+	if (unlikely(clk->flags & RATE_PROPAGATES))
+		propagate_rate(clk);
+}
+
+
+static void followparent_recalc(struct clk *  clk)
+{
+	clk->rate = clk->parent->rate;
+}
+
+
+static void watchdog_recalc(struct clk *  clk)
+{
+	clk->rate = clk->parent->rate / 14;
+}
+
+
+static struct clk ck_ref = {
+	.name		= "ck_ref",
+	.rate		= 12000000,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  ALWAYS_ENABLED,
+};
+
+static struct clk ck_dpll1 = {
+	.name		= "ck_dpll1",
+	.parent		= &ck_ref,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_PROPAGATES | ALWAYS_ENABLED,
+};
+
+static struct clk ck_dpll1out = {
+	.name		= "ck_dpll1out",
+	.parent		= &ck_dpll1,
+	.flags		= CLOCK_IN_OMAP16XX,
+	.enable_reg	= ARM_IDLECT2,
+	.enable_bit	= EN_CKOUT_ARM,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk arm_ck = {
+	.name		= "arm_ck",
+	.parent		= &ck_dpll1,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED,
+	.rate_offset	= CKCTL_ARMDIV_OFFSET,
+	.recalc		= &ckctl_recalc,
+};
+
+static struct clk armper_ck = {
+	.name		= "armper_ck",
+	.parent		= &ck_dpll1,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_CKCTL,
+	.enable_reg	= ARM_IDLECT2,
+	.enable_bit	= EN_PERCK,
+	.rate_offset	= CKCTL_PERDIV_OFFSET,
+	.recalc		= &ckctl_recalc,
+};
+
+static struct clk arm_gpio_ck = {
+	.name		= "arm_gpio_ck",
+	.parent		= &ck_dpll1,
+	.flags		= CLOCK_IN_OMAP1510,
+	.enable_reg	= ARM_IDLECT2,
+	.enable_bit	= EN_GPIOCK,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk armxor_ck = {
+	.name		= "armxor_ck",
+	.parent		= &ck_ref,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
+	.enable_reg	= ARM_IDLECT2,
+	.enable_bit	= EN_XORPCK,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk armtim_ck = {
+	.name		= "armtim_ck",
+	.parent		= &ck_ref,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
+	.enable_reg	= ARM_IDLECT2,
+	.enable_bit	= EN_TIMCK,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk armwdt_ck = {
+	.name		= "armwdt_ck",
+	.parent		= &ck_ref,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
+	.enable_reg	= ARM_IDLECT2,
+	.enable_bit	= EN_WDTCK,
+	.recalc		= &watchdog_recalc,
+};
+
+static struct clk arminth_ck16xx = {
+	.name		= "arminth_ck",
+	.parent		= &arm_ck,
+	.flags		= CLOCK_IN_OMAP16XX,
+	.recalc		= &followparent_recalc,
+	/* Note: On 16xx the frequency can be divided by 2 by programming
+	 * ARM_CKCTL:ARM_INTHCK_SEL(14) to 1
+	 *
+	 * 1510 version is in TC clocks.
+	 */
+};
+
+static struct clk dsp_ck = {
+	.name		= "dsp_ck",
+	.parent		= &ck_dpll1,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_CKCTL,
+	.enable_reg	= ARM_CKCTL,
+	.enable_bit	= EN_DSPCK,
+	.rate_offset	= CKCTL_DSPDIV_OFFSET,
+	.recalc		= &ckctl_recalc,
+};
+
+static struct clk dspmmu_ck = {
+	.name		= "dspmmu_ck",
+	.parent		= &ck_dpll1,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_CKCTL | ALWAYS_ENABLED,
+	.rate_offset	= CKCTL_DSPMMUDIV_OFFSET,
+	.recalc		= &ckctl_recalc,
+};
+
+static struct clk tc_ck = {
+	.name		= "tc_ck",
+	.parent		= &ck_dpll1,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 |
+			  RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED,
+	.rate_offset	= CKCTL_TCDIV_OFFSET,
+	.recalc		= &ckctl_recalc,
+};
+
+static struct clk arminth_ck1510 = {
+	.name		= "arminth_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP1510,
+	.recalc		= &followparent_recalc,
+	/* Note: On 1510 the frequency follows TC_CK
+	 *
+	 * 16xx version is in MPU clocks.
+	 */
+};
+
+static struct clk tipb_ck = {
+	.name		= "tibp_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP1510,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk l3_ocpi_ck = {
+	.name		= "l3_ocpi_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP16XX,
+	.enable_reg	= ARM_IDLECT3,
+	.enable_bit	= EN_OCPI_CK,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk tc1_ck = {
+	.name		= "tc1_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP16XX,
+	.enable_reg	= ARM_IDLECT3,
+	.enable_bit	= EN_TC1_CK,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk tc2_ck = {
+	.name		= "tc2_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP16XX,
+	.enable_reg	= ARM_IDLECT3,
+	.enable_bit	= EN_TC2_CK,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk dma_ck = {
+	.name		= "dma_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk dma_lcdfree_ck = {
+	.name		= "dma_lcdfree_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP16XX,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk api_ck = {
+	.name		= "api_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
+	.enable_reg	= ARM_IDLECT2,
+	.enable_bit	= EN_APICK,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk lb_ck = {
+	.name		= "lb_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP1510,
+	.enable_reg	= ARM_IDLECT2,
+	.enable_bit	= EN_LBCK,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk rhea1_ck = {
+	.name		= "rhea1_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP16XX,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk rhea2_ck = {
+	.name		= "rhea2_ck",
+	.parent		= &tc_ck,
+	.flags		= CLOCK_IN_OMAP16XX,
+	.recalc		= &followparent_recalc,
+};
+
+static struct clk lcd_ck = {
+	.name		= "lcd_ck",
+	.parent		= &ck_dpll1,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 |
+			  RATE_CKCTL,
+	.enable_reg	= ARM_IDLECT2,
+	.enable_bit	= EN_LCDCK,
+	.rate_offset	= CKCTL_LCDDIV_OFFSET,
+	.recalc		= &ckctl_recalc,
+};
+
+static struct clk uart1_ck = {
+	.name		= "uart1_ck",
+	/* Direct from ULPD, no parent */
+	.rate		= 48000000,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_FIXED | ENABLE_REG_32BIT,
+	.enable_reg	= MOD_CONF_CTRL_0,
+	.enable_bit	= 29,
+	/* (Only on 1510)
+	 * The "enable bit" actually chooses between 48MHz and 12MHz.
+	 */
+};
+
+static struct clk uart2_ck = {
+	.name		= "uart2_ck",
+	/* Direct from ULPD, no parent */
+	.rate		= 48000000,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_FIXED | ENABLE_REG_32BIT,
+	.enable_reg	= MOD_CONF_CTRL_0,
+	.enable_bit	= 30,
+	/* (for both 1510 and 16xx)
+	 * The "enable bit" actually chooses between 48MHz and 12MHz/32kHz.
+	 */
+};
+
+static struct clk uart3_ck = {
+	.name		= "uart3_ck",
+	/* Direct from ULPD, no parent */
+	.rate		= 48000000,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_FIXED | ENABLE_REG_32BIT,
+	.enable_reg	= MOD_CONF_CTRL_0,
+	.enable_bit	= 31,
+	/* (Only on 1510)
+	 * The "enable bit" actually chooses between 48MHz and 12MHz.
+	 */
+};
+
+static struct clk usb_clko = {	/* 6 MHz output on W4_USB_CLKO */
+	.name		= "usb_clko",
+	/* Direct from ULPD, no parent */
+	.rate		= 6000000,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_FIXED | ENABLE_REG_32BIT,
+	.enable_reg	= ULPD_CLOCK_CTRL,
+	.enable_bit	= USB_MCLK_EN_BIT,
+};
+
+static struct clk usb_hhc_ck1510 = {
+	.name		= "usb_hhc_ck",
+	/* Direct from ULPD, no parent */
+	.rate		= 48000000, /* Actually 2 clocks, 12MHz and 48MHz */
+	.flags		= CLOCK_IN_OMAP1510 |
+			  RATE_FIXED | ENABLE_REG_32BIT,
+	.enable_reg	= MOD_CONF_CTRL_0,
+	.enable_bit	= USB_HOST_HHC_UHOST_EN,
+};
+
+static struct clk usb_hhc_ck16xx = {
+	.name		= "usb_hhc_ck",
+	/* Direct from ULPD, no parent */
+	.rate		= 48000000,
+	/* OTG_SYSCON_2.OTG_PADEN == 0 (not 1510-compatible) */
+	.flags		= CLOCK_IN_OMAP16XX |
+			  RATE_FIXED | ENABLE_REG_32BIT,
+	.enable_reg	= OTG_BASE + 0x08 /* OTG_SYSCON_2 */,
+	.enable_bit	= 8 /* UHOST_EN */,
+};
+
+static struct clk mclk_1510 = {
+	.name		= "mclk",
+	/* Direct from ULPD, no parent. May be enabled by ext hardware. */
+	.rate		= 12000000,
+	.flags		= CLOCK_IN_OMAP1510 | RATE_FIXED,
+};
+
+static struct clk mclk_16xx = {
+	.name		= "mclk",
+	/* Direct from ULPD, no parent. May be enabled by ext hardware. */
+	.flags		= CLOCK_IN_OMAP16XX,
+	.enable_reg	= COM_CLK_DIV_CTRL_SEL,
+	.enable_bit	= COM_ULPD_PLL_CLK_REQ,
+	.set_rate	= &set_ext_clk_rate,
+	.round_rate	= &round_ext_clk_rate,
+	.init		= &init_ext_clk,
+};
+
+static struct clk bclk_1510 = {
+	.name		= "bclk",
+	/* Direct from ULPD, no parent. May be enabled by ext hardware. */
+	.rate		= 12000000,
+	.flags		= CLOCK_IN_OMAP1510 | RATE_FIXED,
+};
+
+static struct clk bclk_16xx = {
+	.name		= "bclk",
+	/* Direct from ULPD, no parent. May be enabled by ext hardware. */
+	.flags		= CLOCK_IN_OMAP16XX,
+	.enable_reg	= SWD_CLK_DIV_CTRL_SEL,
+	.enable_bit	= SWD_ULPD_PLL_CLK_REQ,
+	.set_rate	= &set_ext_clk_rate,
+	.round_rate	= &round_ext_clk_rate,
+	.init		= &init_ext_clk,
+};
+
+static struct clk mmc1_ck = {
+	.name		= "mmc1_ck",
+	/* Functional clock is direct from ULPD, interface clock is ARMPER */
+	.parent		= &armper_ck,
+	.rate		= 48000000,
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  RATE_FIXED | ENABLE_REG_32BIT,
+	.enable_reg	= MOD_CONF_CTRL_0,
+	.enable_bit	= 23,
+};
+
+static struct clk mmc2_ck = {
+	.name		= "mmc2_ck",
+	/* Functional clock is direct from ULPD, interface clock is ARMPER */
+	.parent		= &armper_ck,
+	.rate		= 48000000,
+	.flags		= CLOCK_IN_OMAP16XX |
+			  RATE_FIXED | ENABLE_REG_32BIT,
+	.enable_reg	= MOD_CONF_CTRL_0,
+	.enable_bit	= 20,
+};
+
+static struct clk virtual_ck_mpu = {
+	.name		= "mpu",
+	.flags		= CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
+			  VIRTUAL_CLOCK | ALWAYS_ENABLED,
+	.parent		= &arm_ck, /* Is smarter alias for */
+	.recalc		= &followparent_recalc,
+	.set_rate	= &select_table_rate,
+	.round_rate	= &round_to_table_rate,
+};
+
+
+static struct clk *  onchip_clks[] = {
+	/* non-ULPD clocks */
+	&ck_ref,
+	&ck_dpll1,
+	/* CK_GEN1 clocks */
+	&ck_dpll1out,
+	&arm_ck,
+	&armper_ck,
+	&arm_gpio_ck,
+	&armxor_ck,
+	&armtim_ck,
+	&armwdt_ck,
+	&arminth_ck1510,  &arminth_ck16xx,
+	/* CK_GEN2 clocks */
+	&dsp_ck,
+	&dspmmu_ck,
+	/* CK_GEN3 clocks */
+	&tc_ck,
+	&tipb_ck,
+	&l3_ocpi_ck,
+	&tc1_ck,
+	&tc2_ck,
+	&dma_ck,
+	&dma_lcdfree_ck,
+	&api_ck,
+	&lb_ck,
+	&rhea1_ck,
+	&rhea2_ck,
+	&lcd_ck,
+	/* ULPD clocks */
+	&uart1_ck,
+	&uart2_ck,
+	&uart3_ck,
+	&usb_clko,
+	&usb_hhc_ck1510, &usb_hhc_ck16xx,
+	&mclk_1510,  &mclk_16xx,
+	&bclk_1510,  &bclk_16xx,
+	&mmc1_ck,
+	&mmc2_ck,
+	/* Virtual clocks */
+	&virtual_ck_mpu,
+};
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+	struct clk *p, *clk = ERR_PTR(-ENOENT);
+
+	down(&clocks_sem);
+	list_for_each_entry(p, &clocks, node) {
+		if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
+			clk = p;
+			break;
+		}
+	}
+	up(&clocks_sem);
+
+	return clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+
+void clk_put(struct clk *clk)
+{
+	if (clk && !IS_ERR(clk))
+		module_put(clk->owner);
+}
+EXPORT_SYMBOL(clk_put);
+
+
+int __clk_enable(struct clk *clk)
+{
+	__u16 regval16;
+	__u32 regval32;
+
+	if (clk->flags & ALWAYS_ENABLED)
+		return 0;
+
+	if (unlikely(clk->enable_reg == 0)) {
+		printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
+		       clk->name);
+		return 0;
+	}
+
+	if (clk->flags & ENABLE_REG_32BIT) {
+		regval32 = omap_readl(clk->enable_reg);
+		regval32 |= (1 << clk->enable_bit);
+		omap_writel(regval32, clk->enable_reg);
+	} else {
+		regval16 = omap_readw(clk->enable_reg);
+		regval16 |= (1 << clk->enable_bit);
+		omap_writew(regval16, clk->enable_reg);
+	}
+
+	return 0;
+}
+
+
+void __clk_disable(struct clk *clk)
+{
+	__u16 regval16;
+	__u32 regval32;
+
+	if (clk->enable_reg == 0)
+		return;
+
+	if (clk->flags & ENABLE_REG_32BIT) {
+		regval32 = omap_readl(clk->enable_reg);
+		regval32 &= ~(1 << clk->enable_bit);
+		omap_writel(regval32, clk->enable_reg);
+	} else {
+		regval16 = omap_readw(clk->enable_reg);
+		regval16 &= ~(1 << clk->enable_bit);
+		omap_writew(regval16, clk->enable_reg);
+	}
+}
+
+
+void __clk_unuse(struct clk *clk)
+{
+	if (clk->usecount > 0 && !(--clk->usecount)) {
+		__clk_disable(clk);
+		if (likely(clk->parent))
+			__clk_unuse(clk->parent);
+	}
+}
+
+
+int __clk_use(struct clk *clk)
+{
+	int ret = 0;
+	if (clk->usecount++ == 0) {
+		if (likely(clk->parent))
+			ret = __clk_use(clk->parent);
+
+		if (unlikely(ret != 0)) {
+			clk->usecount--;
+			return ret;
+		}
+
+		ret = __clk_enable(clk);
+
+		if (unlikely(ret != 0) && clk->parent) {
+			__clk_unuse(clk->parent);
+			clk->usecount--;
+		}
+	}
+
+	return ret;
+}
+
+
+int clk_enable(struct clk *clk)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&clockfw_lock, flags);
+	ret = __clk_enable(clk);
+	spin_unlock_irqrestore(&clockfw_lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(clk_enable);
+
+
+void clk_disable(struct clk *clk)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&clockfw_lock, flags);
+	__clk_disable(clk);
+	spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+
+int clk_use(struct clk *clk)
+{
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&clockfw_lock, flags);
+	ret = __clk_use(clk);
+	spin_unlock_irqrestore(&clockfw_lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(clk_use);
+
+
+void clk_unuse(struct clk *clk)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&clockfw_lock, flags);
+	__clk_unuse(clk);
+	spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+EXPORT_SYMBOL(clk_unuse);
+
+
+int clk_get_usecount(struct clk *clk)
+{
+        return clk->usecount;
+}
+EXPORT_SYMBOL(clk_get_usecount);
+
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	return clk->rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+
+static __u16 verify_ckctl_value(__u16 newval)
+{
+	/* This function checks for following limitations set
+	 * by the hardware (all conditions must be true):
+	 * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
+	 * ARM_CK >= TC_CK
+	 * DSP_CK >= TC_CK
+	 * DSPMMU_CK >= TC_CK
+	 *
+	 * In addition following rules are enforced:
+	 * LCD_CK <= TC_CK
+	 * ARMPER_CK <= TC_CK
+	 *
+	 * However, maximum frequencies are not checked for!
+	 */
+	__u8 per_exp;
+	__u8 lcd_exp;
+	__u8 arm_exp;
+	__u8 dsp_exp;
+	__u8 tc_exp;
+	__u8 dspmmu_exp;
+
+	per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
+	lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
+	arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
+	dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
+	tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
+	dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
+
+	if (dspmmu_exp < dsp_exp)
+		dspmmu_exp = dsp_exp;
+	if (dspmmu_exp > dsp_exp+1)
+		dspmmu_exp = dsp_exp+1;
+	if (tc_exp < arm_exp)
+		tc_exp = arm_exp;
+	if (tc_exp < dspmmu_exp)
+		tc_exp = dspmmu_exp;
+	if (tc_exp > lcd_exp)
+		lcd_exp = tc_exp;
+	if (tc_exp > per_exp)
+		per_exp = tc_exp;
+
+	newval &= 0xf000;
+	newval |= per_exp << CKCTL_PERDIV_OFFSET;
+	newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
+	newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
+	newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
+	newval |= tc_exp << CKCTL_TCDIV_OFFSET;
+	newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
+
+	return newval;
+}
+
+
+static int calc_dsor_exp(struct clk *clk, unsigned long rate)
+{
+	/* Note: If target frequency is too low, this function will return 4,
+	 * which is invalid value. Caller must check for this value and act
+	 * accordingly.
+	 *
+	 * Note: This function does not check for following limitations set
+	 * by the hardware (all conditions must be true):
+	 * DSPMMU_CK == DSP_CK  or  DSPMMU_CK == DSP_CK/2
+	 * ARM_CK >= TC_CK
+	 * DSP_CK >= TC_CK
+	 * DSPMMU_CK >= TC_CK
+	 */
+	unsigned long realrate;
+	struct clk *  parent;
+	unsigned  dsor_exp;
+
+	if (unlikely(!(clk->flags & RATE_CKCTL)))
+		return -EINVAL;
+
+	parent = clk->parent;
+	if (unlikely(parent == 0))
+		return -EIO;
+
+	realrate = parent->rate;
+	for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
+		if (realrate <= rate)
+			break;
+
+		realrate /= 2;
+	}
+
+	return dsor_exp;
+}
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+	int dsor_exp;
+
+	if (clk->flags & RATE_FIXED)
+		return clk->rate;
+
+	if (clk->flags & RATE_CKCTL) {
+		dsor_exp = calc_dsor_exp(clk, rate);
+		if (dsor_exp < 0)
+			return dsor_exp;
+		if (dsor_exp > 3)
+			dsor_exp = 3;
+		return clk->parent->rate / (1 << dsor_exp);
+	}
+
+	if(clk->round_rate != 0)
+		return clk->round_rate(clk, rate);
+
+	return clk->rate;
+}
+EXPORT_SYMBOL(clk_round_rate);
+
+
+static void propagate_rate(struct clk *  clk)
+{
+	struct clk **  clkp;
+
+	for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
+		if (likely((*clkp)->parent != clk)) continue;
+		if (likely((*clkp)->recalc))
+			(*clkp)->recalc(*clkp);
+	}
+}
+
+
+static int select_table_rate(struct clk *  clk, unsigned long rate)
+{
+	/* Find the highest supported frequency <= rate and switch to it */
+	struct mpu_rate *  ptr;
+
+	if (clk != &virtual_ck_mpu)
+		return -EINVAL;
+
+	for (ptr = rate_table; ptr->rate; ptr++) {
+		if (ptr->xtal != ck_ref.rate)
+			continue;
+
+		/* DPLL1 cannot be reprogrammed without risking system crash */
+		if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
+			continue;
+
+		/* Can check only after xtal frequency check */
+		if (ptr->rate <= rate)
+			break;
+	}
+
+	if (!ptr->rate)
+		return -EINVAL;
+
+	if (unlikely(ck_dpll1.rate == 0)) {
+		omap_writew(ptr->dpllctl_val, DPLL_CTL);
+		ck_dpll1.rate = ptr->pll_rate;
+	}
+	omap_writew(ptr->ckctl_val, ARM_CKCTL);
+	propagate_rate(&ck_dpll1);
+	return 0;
+}
+
+
+static long round_to_table_rate(struct clk *  clk, unsigned long rate)
+{
+	/* Find the highest supported frequency <= rate */
+	struct mpu_rate *  ptr;
+	long  highest_rate;
+
+	if (clk != &virtual_ck_mpu)
+		return -EINVAL;
+
+	highest_rate = -EINVAL;
+
+	for (ptr = rate_table; ptr->rate; ptr++) {
+		if (ptr->xtal != ck_ref.rate)
+			continue;
+
+		highest_rate = ptr->rate;
+
+		/* Can check only after xtal frequency check */
+		if (ptr->rate <= rate)
+			break;
+	}
+
+	return highest_rate;
+}
+
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	int  ret = -EINVAL;
+	int  dsor_exp;
+	__u16  regval;
+	unsigned long  flags;
+
+	if (clk->flags & RATE_CKCTL) {
+		dsor_exp = calc_dsor_exp(clk, rate);
+		if (dsor_exp > 3)
+			dsor_exp = -EINVAL;
+		if (dsor_exp < 0)
+			return dsor_exp;
+
+		spin_lock_irqsave(&clockfw_lock, flags);
+		regval = omap_readw(ARM_CKCTL);
+		regval &= ~(3 << clk->rate_offset);
+		regval |= dsor_exp << clk->rate_offset;
+		regval = verify_ckctl_value(regval);
+		omap_writew(regval, ARM_CKCTL);
+		clk->rate = clk->parent->rate / (1 << dsor_exp);
+		spin_unlock_irqrestore(&clockfw_lock, flags);
+		ret = 0;
+	} else if(clk->set_rate != 0) {
+		spin_lock_irqsave(&clockfw_lock, flags);
+		ret = clk->set_rate(clk, rate);
+		spin_unlock_irqrestore(&clockfw_lock, flags);
+	}
+
+	if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
+		propagate_rate(clk);
+
+	return ret;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+
+static unsigned calc_ext_dsor(unsigned long rate)
+{
+	unsigned dsor;
+
+	/* MCLK and BCLK divisor selection is not linear:
+	 * freq = 96MHz / dsor
+	 *
+	 * RATIO_SEL range: dsor <-> RATIO_SEL
+	 * 0..6: (RATIO_SEL+2) <-> (dsor-2)
+	 * 6..48:  (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
+	 * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
+	 * can not be used.
+	 */
+	for (dsor = 2; dsor < 96; ++dsor) {
+		if ((dsor & 1) && dsor > 8)
+		  	continue;
+		if (rate >= 96000000 / dsor)
+			break;
+	}
+	return dsor;
+}
+
+
+static int set_ext_clk_rate(struct clk *  clk, unsigned long rate)
+{
+	unsigned dsor;
+	__u16 ratio_bits;
+
+	dsor = calc_ext_dsor(rate);
+	clk->rate = 96000000 / dsor;
+	if (dsor > 8)
+		ratio_bits = ((dsor - 8) / 2 + 6) << 2;
+	else
+		ratio_bits = (dsor - 2) << 2;
+
+	ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
+	omap_writew(ratio_bits, clk->enable_reg);
+
+	return 0;
+}
+
+
+static long round_ext_clk_rate(struct clk *  clk, unsigned long rate)
+{
+	return 96000000 / calc_ext_dsor(rate);
+}
+
+
+static void init_ext_clk(struct clk *  clk)
+{
+	unsigned dsor;
+	__u16 ratio_bits;
+
+	/* Determine current rate and ensure clock is based on 96MHz APLL */
+	ratio_bits = omap_readw(clk->enable_reg) & ~1;
+	omap_writew(ratio_bits, clk->enable_reg);
+
+	ratio_bits = (ratio_bits & 0xfc) >> 2;
+	if (ratio_bits > 6)
+		dsor = (ratio_bits - 6) * 2 + 8;
+	else
+		dsor = ratio_bits + 2;
+
+	clk-> rate = 96000000 / dsor;
+}
+
+
+int clk_register(struct clk *clk)
+{
+	down(&clocks_sem);
+	list_add(&clk->node, &clocks);
+	if (clk->init)
+		clk->init(clk);
+	up(&clocks_sem);
+	return 0;
+}
+EXPORT_SYMBOL(clk_register);
+
+void clk_unregister(struct clk *clk)
+{
+	down(&clocks_sem);
+	list_del(&clk->node);
+	up(&clocks_sem);
+}
+EXPORT_SYMBOL(clk_unregister);
+
+
+
+int __init clk_init(void)
+{
+	struct clk **  clkp;
+	const struct omap_clock_config *info;
+	int crystal_type = 0; /* Default 12 MHz */
+
+	for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
+		if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
+			clk_register(*clkp);
+			continue;
+		}
+
+		if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
+			clk_register(*clkp);
+			continue;
+		}
+
+		if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
+			clk_register(*clkp);
+			continue;
+		}
+	}
+
+	info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
+	if (info != NULL) {
+		if (!cpu_is_omap1510())
+			crystal_type = info->system_clock_type;
+	}
+
+#if defined(CONFIG_ARCH_OMAP730)
+	ck_ref.rate = 13000000;
+#elif defined(CONFIG_ARCH_OMAP16XX)
+	if (crystal_type == 2)
+		ck_ref.rate = 19200000;
+#endif
+
+	/* We want to be in syncronous scalable mode */
+	omap_writew(0x1000, ARM_SYSST);
+
+	/* Find the highest supported frequency and enable it */
+	if (select_table_rate(&virtual_ck_mpu, ~0)) {
+		printk(KERN_ERR "System frequencies not set. Check your config.\n");
+		/* Guess sane values (60MHz) */
+		omap_writew(0x2290, DPLL_CTL);
+		omap_writew(0x1005, ARM_CKCTL);
+		ck_dpll1.rate = 60000000;
+		propagate_rate(&ck_dpll1);
+		printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): %ld/%ld/%ld\n",
+		       ck_ref.rate, ck_dpll1.rate, arm_ck.rate);
+	}
+
+	/* Cache rates for clocks connected to ck_ref (not dpll1) */
+	propagate_rate(&ck_ref);
+
+#ifdef CONFIG_MACH_OMAP_PERSEUS2
+	/* Select slicer output as OMAP input clock */
+	omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
+#endif
+
+	/* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
+	omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
+
+	/* Put DSP/MPUI into reset until needed */
+	omap_writew(0, ARM_RSTCT1);
+	omap_writew(1, ARM_RSTCT2);
+	omap_writew(0x400, ARM_IDLECT1);
+
+	/*
+	 * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
+	 * of the ARM_IDLECT2 register must be set to zero. The power-on
+	 * default value of this bit is one.
+	 */
+	omap_writew(0x0000, ARM_IDLECT2);	/* Turn LCD clock off also */
+
+	/*
+	 * Only enable those clocks we will need, let the drivers
+	 * enable other clocks as necessary
+	 */
+	clk_use(&armper_ck);
+	clk_use(&armxor_ck);
+	clk_use(&armtim_ck);
+
+	if (cpu_is_omap1510())
+		clk_enable(&arm_gpio_ck);
+
+	return 0;
+}
diff --git a/arch/arm/plat-omap/clock.h b/arch/arm/plat-omap/clock.h
new file mode 100644
index 0000000..08b504d
--- /dev/null
+++ b/arch/arm/plat-omap/clock.h
@@ -0,0 +1,112 @@
+/*
+ *  linux/arch/arm/plat-omap/clock.h
+ *
+ *  Copyright (C) 2004 Nokia corporation
+ *  Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
+ *  Based on clocks.h by Tony Lindgren, Gordon McNutt and RidgeRun, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ARCH_ARM_OMAP_CLOCK_H
+#define __ARCH_ARM_OMAP_CLOCK_H
+
+struct module;
+
+struct clk {
+	struct list_head	node;
+	struct module		*owner;
+	const char		*name;
+	struct clk		*parent;
+	unsigned long		rate;
+	__s8			usecount;
+	__u16			flags;
+	__u32			enable_reg;
+	__u8			enable_bit;
+	__u8			rate_offset;
+	void			(*recalc)(struct clk *);
+	int			(*set_rate)(struct clk *, unsigned long);
+	long			(*round_rate)(struct clk *, unsigned long);
+	void			(*init)(struct clk *);
+};
+
+
+struct mpu_rate {
+	unsigned long		rate;
+	unsigned long		xtal;
+	unsigned long		pll_rate;
+	__u16			ckctl_val;
+	__u16			dpllctl_val;
+};
+
+
+/* Clock flags */
+#define RATE_CKCTL		1
+#define RATE_FIXED		2
+#define RATE_PROPAGATES		4
+#define VIRTUAL_CLOCK		8
+#define ALWAYS_ENABLED		16
+#define ENABLE_REG_32BIT	32
+#define CLOCK_IN_OMAP16XX	64
+#define CLOCK_IN_OMAP1510	128
+#define CLOCK_IN_OMAP730	256
+
+/* ARM_CKCTL bit shifts */
+#define CKCTL_PERDIV_OFFSET	0
+#define CKCTL_LCDDIV_OFFSET	2
+#define CKCTL_ARMDIV_OFFSET	4
+#define CKCTL_DSPDIV_OFFSET	6
+#define CKCTL_TCDIV_OFFSET	8
+#define CKCTL_DSPMMUDIV_OFFSET	10
+/*#define ARM_TIMXO		12*/
+#define EN_DSPCK		13
+/*#define ARM_INTHCK_SEL	14*/ /* Divide-by-2 for mpu inth_ck */
+
+/* ARM_IDLECT1 bit shifts */
+/*#define IDLWDT_ARM	0*/
+/*#define IDLXORP_ARM	1*/
+/*#define IDLPER_ARM	2*/
+/*#define IDLLCD_ARM	3*/
+/*#define IDLLB_ARM	4*/
+/*#define IDLHSAB_ARM	5*/
+/*#define IDLIF_ARM	6*/
+/*#define IDLDPLL_ARM	7*/
+/*#define IDLAPI_ARM	8*/
+/*#define IDLTIM_ARM	9*/
+/*#define SETARM_IDLE	11*/
+
+/* ARM_IDLECT2 bit shifts */
+#define EN_WDTCK	0
+#define EN_XORPCK	1
+#define EN_PERCK	2
+#define EN_LCDCK	3
+#define EN_LBCK		4 /* Not on 1610/1710 */
+/*#define EN_HSABCK	5*/
+#define EN_APICK	6
+#define EN_TIMCK	7
+#define DMACK_REQ	8
+#define EN_GPIOCK	9 /* Not on 1610/1710 */
+/*#define EN_LBFREECK	10*/
+#define EN_CKOUT_ARM	11
+
+/* ARM_IDLECT3 bit shifts */
+#define EN_OCPI_CK	0
+#define EN_TC1_CK	2
+#define EN_TC2_CK	4
+
+/* Various register defines for clock controls scattered around OMAP chip */
+#define USB_MCLK_EN_BIT		4	/* In ULPD_CLKC_CTRL */
+#define USB_HOST_HHC_UHOST_EN	9	/* In MOD_CONF_CTRL_0 */
+#define SWD_ULPD_PLL_CLK_REQ	1	/* In SWD_CLK_DIV_CTRL_SEL */
+#define COM_ULPD_PLL_CLK_REQ	1	/* In COM_CLK_DIV_CTRL_SEL */
+#define SWD_CLK_DIV_CTRL_SEL	0xfffe0874
+#define COM_CLK_DIV_CTRL_SEL	0xfffe0878
+
+
+int clk_register(struct clk *clk);
+void clk_unregister(struct clk *clk);
+int clk_init(void);
+
+#endif