arch/arm/mach-msm/acpuclock-arm11.c - kernel/msm - Gitiles

 /* arch/arm/mach-msm/acpuclock.c
  *
  * MSM architecture clock driver
  *
  * Copyright (C) 2007 Google, Inc.
  * Copyright (c) 2007 QUALCOMM Incorporated
  * Author: San Mehat <san@android.com>
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * 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.
  *
  */

 #include <linux/version.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/cpufreq.h>
 #include <linux/mutex.h>
 #include <linux/io.h>
 #include <mach/board.h>
 #include <mach/msm_iomap.h>
 #include <mach/proc_comm.h>

 #include "acpuclock.h"


 #define A11S_CLK_CNTL_ADDR (MSM_CSR_BASE + 0x100)
 #define A11S_CLK_SEL_ADDR (MSM_CSR_BASE + 0x104)
 #define A11S_VDD_SVS_PLEVEL_ADDR (MSM_CSR_BASE + 0x124)

 /*
  * ARM11 clock configuration for specific ACPU speeds
  */

 #define ACPU_PLL_TCXO	-1
 #define ACPU_PLL_0	0
 #define ACPU_PLL_1	1
 #define ACPU_PLL_2	2
 #define ACPU_PLL_3	3

 #define PERF_SWITCH_DEBUG 0
 #define PERF_SWITCH_STEP_DEBUG 0

 struct clock_state
 {
 	struct clkctl_acpu_speed	*current_speed;
 	struct mutex			lock;
 	uint32_t			acpu_switch_time_us;
 	uint32_t			max_speed_delta_khz;
 	uint32_t			vdd_switch_time_us;
 	unsigned long			power_collapse_khz;
 	unsigned long			wait_for_irq_khz;
 };

 static struct clk *ebi1_clk;
 static struct clock_state drv_state = { 0 };

 static void __init acpuclk_init(void);

 /* MSM7201A Levels 3-6 all correspond to 1.2V, level 7 corresponds to 1.325V. */
 enum {
 	VDD_0 = 0,
 	VDD_1 = 1,
 	VDD_2 = 2,
 	VDD_3 = 3,
 	VDD_4 = 3,
 	VDD_5 = 3,
 	VDD_6 = 3,
 	VDD_7 = 7,
 	VDD_END
 };

 struct clkctl_acpu_speed {
 	unsigned int	a11clk_khz;
 	int		pll;
 	unsigned int	a11clk_src_sel;
 	unsigned int	a11clk_src_div;
 	unsigned int	ahbclk_khz;
 	unsigned int	ahbclk_div;
 	int		vdd;
 	unsigned int 	axiclk_khz;
 	unsigned long	lpj; /* loops_per_jiffy */
 /* Index in acpu_freq_tbl[] for steppings. */
 	short		down;
 	short		up;
 };

 /*
  * ACPU speed table. Complete table is shown but certain speeds are commented
  * out to optimized speed switching. Initalize loops_per_jiffy to 0.
  *
  * Table stepping up/down is optimized for 256mhz jumps while staying on the
  * same PLL.
  */
 #if (0)
 static struct clkctl_acpu_speed  acpu_freq_tbl[] = {
 	{ 19200, ACPU_PLL_TCXO, 0, 0, 19200, 0, VDD_0, 30720, 0, 0, 8 },
 	{ 61440, ACPU_PLL_0,  4, 3, 61440,  0, VDD_0, 30720,  0, 0, 8 },
 	{ 81920, ACPU_PLL_0,  4, 2, 40960,  1, VDD_0, 61440,  0, 0, 8 },
 	{ 96000, ACPU_PLL_1,  1, 7, 48000,  1, VDD_0, 61440,  0, 0, 9 },
 	{ 122880, ACPU_PLL_0, 4, 1, 61440,  1, VDD_3, 61440,  0, 0, 8 },
 	{ 128000, ACPU_PLL_1, 1, 5, 64000,  1, VDD_3, 61440,  0, 0, 12 },
 	{ 176000, ACPU_PLL_2, 2, 5, 88000,  1, VDD_3, 61440,  0, 0, 11 },
 	{ 192000, ACPU_PLL_1, 1, 3, 64000,  2, VDD_3, 61440,  0, 0, 12 },
 	{ 245760, ACPU_PLL_0, 4, 0, 81920,  2, VDD_4, 61440,  0, 0, 12 },
 	{ 256000, ACPU_PLL_1, 1, 2, 128000, 2, VDD_5, 128000, 0, 0, 12 },
 	{ 264000, ACPU_PLL_2, 2, 3, 88000,  2, VDD_5, 128000, 0, 6, 13 },
 	{ 352000, ACPU_PLL_2, 2, 2, 88000,  3, VDD_5, 128000, 0, 6, 13 },
 	{ 384000, ACPU_PLL_1, 1, 1, 128000, 2, VDD_6, 128000, 0, 5, -1 },
 	{ 528000, ACPU_PLL_2, 2, 1, 132000, 3, VDD_7, 128000, 0, 11, -1 },
 	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
 };
 #else /* Table of freq we currently use. */
 static struct clkctl_acpu_speed  acpu_freq_tbl[] = {
 	{ 19200, ACPU_PLL_TCXO, 0, 0, 19200, 0, VDD_0, 30720, 0, 0, 4 },
 	{ 122880, ACPU_PLL_0, 4, 1, 61440, 1, VDD_3, 61440, 0, 0, 4 },
 	{ 128000, ACPU_PLL_1, 1, 5, 64000, 1, VDD_3, 61440, 0, 0, 6 },
 	{ 176000, ACPU_PLL_2, 2, 5, 88000, 1, VDD_3, 61440, 0, 0, 5 },
 	{ 245760, ACPU_PLL_0, 4, 0, 81920, 2, VDD_4, 61440, 0, 0, 5 },
 	{ 352000, ACPU_PLL_2, 2, 2, 88000, 3, VDD_5, 128000, 0, 3, 7 },
 	{ 384000, ACPU_PLL_1, 1, 1, 128000, 2, VDD_6, 128000, 0, 2, -1 },
 	{ 528000, ACPU_PLL_2, 2, 1, 132000, 3, VDD_7, 128000, 0, 5, -1 },
 	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
 };
 #endif


 #ifdef CONFIG_CPU_FREQ_TABLE
 static struct cpufreq_frequency_table freq_table[] = {
 	{ 0, 122880 },
 	{ 1, 128000 },
 	{ 2, 245760 },
 	{ 3, 384000 },
 	{ 4, 528000 },
 	{ 5, CPUFREQ_TABLE_END },
 };
 #endif

 static int pc_pll_request(unsigned id, unsigned on)
 {
 	int res;
 	on = !!on;

 #if PERF_SWITCH_DEBUG
 	if (on)
 		printk(KERN_DEBUG "Enabling PLL %d\n", id);
 	else
 		printk(KERN_DEBUG "Disabling PLL %d\n", id);
 #endif

 	res = msm_proc_comm(PCOM_CLKCTL_RPC_PLL_REQUEST, &id, &on);
 	if (res < 0)
 		return res;

 #if PERF_SWITCH_DEBUG
 	if (on)
 		printk(KERN_DEBUG "PLL %d enabled\n", id);
 	else
 		printk(KERN_DEBUG "PLL %d disabled\n", id);
 #endif
 	return res;
 }


 /*----------------------------------------------------------------------------
  * ARM11 'owned' clock control
  *---------------------------------------------------------------------------*/

 unsigned long acpuclk_power_collapse(void) {
 	int ret = acpuclk_get_rate();
 	ret *= 1000;
 	if (ret > drv_state.power_collapse_khz)
 		acpuclk_set_rate(drv_state.power_collapse_khz, 1);
 	return ret;
 }

 unsigned long acpuclk_get_wfi_rate(void)
 {
 	return drv_state.wait_for_irq_khz;
 }

 unsigned long acpuclk_wait_for_irq(void) {
 	int ret = acpuclk_get_rate();
 	ret *= 1000;
 	if (ret > drv_state.wait_for_irq_khz)
 		acpuclk_set_rate(drv_state.wait_for_irq_khz, 1);
 	return ret;
 }

 static int acpuclk_set_vdd_level(int vdd)
 {
 	uint32_t current_vdd;

 	current_vdd = readl(A11S_VDD_SVS_PLEVEL_ADDR) & 0x07;

 #if PERF_SWITCH_DEBUG
 	printk(KERN_DEBUG "acpuclock: Switching VDD from %u -> %d\n",
 	       current_vdd, vdd);
 #endif
 	writel((1 << 7) | (vdd << 3), A11S_VDD_SVS_PLEVEL_ADDR);
 	udelay(drv_state.vdd_switch_time_us);
 	if ((readl(A11S_VDD_SVS_PLEVEL_ADDR) & 0x7) != vdd) {
 #if PERF_SWITCH_DEBUG
 		printk(KERN_ERR "acpuclock: VDD set failed\n");
 #endif
 		return -EIO;
 	}

 #if PERF_SWITCH_DEBUG
 	printk(KERN_DEBUG "acpuclock: VDD switched\n");
 #endif
 	return 0;
 }

 /* Set proper dividers for the given clock speed. */
 static void acpuclk_set_div(const struct clkctl_acpu_speed *hunt_s) {
 	uint32_t reg_clkctl, reg_clksel, clk_div;

 	/* AHB_CLK_DIV */
 	clk_div = (readl(A11S_CLK_SEL_ADDR) >> 1) & 0x03;
 	/*
 	 * If the new clock divider is higher than the previous, then
 	 * program the divider before switching the clock
 	 */
 	if (hunt_s->ahbclk_div > clk_div) {
 		reg_clksel = readl(A11S_CLK_SEL_ADDR);
 		reg_clksel &= ~(0x3 << 1);
 		reg_clksel |= (hunt_s->ahbclk_div << 1);
 		writel(reg_clksel, A11S_CLK_SEL_ADDR);
 	}
 	if ((readl(A11S_CLK_SEL_ADDR) & 0x01) == 0) {
 		/* SRC0 */

 		/* Program clock source */
 		reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
 		reg_clkctl &= ~(0x07 << 4);
 		reg_clkctl |= (hunt_s->a11clk_src_sel << 4);
 		writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

 		/* Program clock divider */
 		reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
 		reg_clkctl &= ~0xf;
 		reg_clkctl |= hunt_s->a11clk_src_div;
 		writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

 		/* Program clock source selection */
 		reg_clksel = readl(A11S_CLK_SEL_ADDR);
 		reg_clksel |= 1; /* CLK_SEL_SRC1NO  == SRC1 */
 		writel(reg_clksel, A11S_CLK_SEL_ADDR);
 	} else {
 		/* SRC1 */

 		/* Program clock source */
 		reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
 		reg_clkctl &= ~(0x07 << 12);
 		reg_clkctl |= (hunt_s->a11clk_src_sel << 12);
 		writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

 		/* Program clock divider */
 		reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
 		reg_clkctl &= ~(0xf << 8);
 		reg_clkctl |= (hunt_s->a11clk_src_div << 8);
 		writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

 		/* Program clock source selection */
 		reg_clksel = readl(A11S_CLK_SEL_ADDR);
 		reg_clksel &= ~1; /* CLK_SEL_SRC1NO  == SRC0 */
 		writel(reg_clksel, A11S_CLK_SEL_ADDR);
 	}

 	/*
 	 * If the new clock divider is lower than the previous, then
 	 * program the divider after switching the clock
 	 */
 	if (hunt_s->ahbclk_div < clk_div) {
 		reg_clksel = readl(A11S_CLK_SEL_ADDR);
 		reg_clksel &= ~(0x3 << 1);
 		reg_clksel |= (hunt_s->ahbclk_div << 1);
 		writel(reg_clksel, A11S_CLK_SEL_ADDR);
 	}
 }

 int acpuclk_set_rate(unsigned long rate, int for_power_collapse)
 {
 	uint32_t reg_clkctl;
 	struct clkctl_acpu_speed *cur_s, *tgt_s, *strt_s;
 	int rc = 0;
 	unsigned int plls_enabled = 0, pll;

 	strt_s = cur_s = drv_state.current_speed;

 	WARN_ONCE(cur_s == NULL, "acpuclk_set_rate: not initialized\n");
 	if (cur_s == NULL)
 		return -ENOENT;

 	if (rate == (cur_s->a11clk_khz * 1000))
 		return 0;

 	for (tgt_s = acpu_freq_tbl; tgt_s->a11clk_khz != 0; tgt_s++) {
 		if (tgt_s->a11clk_khz == (rate / 1000))
 			break;
 	}

 	if (tgt_s->a11clk_khz == 0)
 		return -EINVAL;

 	/* Choose the highest speed speed at or below 'rate' with same PLL. */
 	if (for_power_collapse && tgt_s->a11clk_khz < cur_s->a11clk_khz) {
 		while (tgt_s->pll != ACPU_PLL_TCXO && tgt_s->pll != cur_s->pll)
 			tgt_s--;
 	}

 	if (strt_s->pll != ACPU_PLL_TCXO)
 		plls_enabled |= 1 << strt_s->pll;

 	if (!for_power_collapse) {
 		mutex_lock(&drv_state.lock);
 		if (strt_s->pll != tgt_s->pll && tgt_s->pll != ACPU_PLL_TCXO) {
 			rc = pc_pll_request(tgt_s->pll, 1);
 			if (rc < 0) {
 				pr_err("PLL%d enable failed (%d)\n",
 					tgt_s->pll, rc);
 				goto out;
 			}
 			plls_enabled |= 1 << tgt_s->pll;
 		}
 		/* Increase VDD if needed. */
 		if (tgt_s->vdd > cur_s->vdd) {
 			if ((rc = acpuclk_set_vdd_level(tgt_s->vdd)) < 0) {
 				printk(KERN_ERR "Unable to switch ACPU vdd\n");
 				goto out;
 			}
 		}
 	}

 	/* Set wait states for CPU between frequency changes */
 	reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
 	reg_clkctl |= (100 << 16); /* set WT_ST_CNT */
 	writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

 #if PERF_SWITCH_DEBUG
 	printk(KERN_INFO "acpuclock: Switching from ACPU rate %u -> %u\n",
 	       strt_s->a11clk_khz * 1000, tgt_s->a11clk_khz * 1000);
 #endif

 	while (cur_s != tgt_s) {
 		/*
 		 * Always jump to target freq if within 256mhz, regulardless of
 		 * PLL. If differnece is greater, use the predefinied
 		 * steppings in the table.
 		 */
 		int d = abs((int)(cur_s->a11clk_khz - tgt_s->a11clk_khz));
 		if (d > drv_state.max_speed_delta_khz) {
 			/* Step up or down depending on target vs current. */
 			int clk_index = tgt_s->a11clk_khz > cur_s->a11clk_khz ?
 				cur_s->up : cur_s->down;
 			if (clk_index < 0) { /* This should not happen. */
 				printk(KERN_ERR "cur:%u target: %u\n",
 					cur_s->a11clk_khz, tgt_s->a11clk_khz);
 				rc = -EINVAL;
 				goto out;
 			}
 			cur_s = &acpu_freq_tbl[clk_index];
 		} else {
 			cur_s = tgt_s;
 		}
 #if PERF_SWITCH_STEP_DEBUG
 		printk(KERN_DEBUG "%s: STEP khz = %u, pll = %d\n",
 			__FUNCTION__, cur_s->a11clk_khz, cur_s->pll);
 #endif
 		if (!for_power_collapse&& cur_s->pll != ACPU_PLL_TCXO
 		    && !(plls_enabled & (1 << cur_s->pll))) {
 			rc = pc_pll_request(cur_s->pll, 1);
 			if (rc < 0) {
 				pr_err("PLL%d enable failed (%d)\n",
 					cur_s->pll, rc);
 				goto out;
 			}
 			plls_enabled |= 1 << cur_s->pll;
 		}

 		acpuclk_set_div(cur_s);
 		drv_state.current_speed = cur_s;
 		/* Re-adjust lpj for the new clock speed. */
 		loops_per_jiffy = cur_s->lpj;
 		udelay(drv_state.acpu_switch_time_us);
 	}

 	/* Nothing else to do for power collapse. */
 	if (for_power_collapse)
 		return 0;

 	/* Disable PLLs we are not using anymore. */
 	plls_enabled &= ~(1 << tgt_s->pll);
 	for (pll = ACPU_PLL_0; pll <= ACPU_PLL_2; pll++)
 		if (plls_enabled & (1 << pll)) {
 			rc = pc_pll_request(pll, 0);
 			if (rc < 0) {
 				pr_err("PLL%d disable failed (%d)\n", pll, rc);
 				goto out;
 			}
 		}

 	/* Change the AXI bus frequency if we can. */
 	if (strt_s->axiclk_khz != tgt_s->axiclk_khz) {
 		rc = clk_set_rate(ebi1_clk, tgt_s->axiclk_khz * 1000);
 		if (rc < 0)
 			pr_err("Setting AXI min rate failed!\n");
 	}

 	/* Drop VDD level if we can. */
 	if (tgt_s->vdd < strt_s->vdd) {
 		if (acpuclk_set_vdd_level(tgt_s->vdd) < 0)
 			printk(KERN_ERR "acpuclock: Unable to drop ACPU vdd\n");
 	}

 #if PERF_SWITCH_DEBUG
 	printk(KERN_DEBUG "%s: ACPU speed change complete\n", __FUNCTION__);
 #endif
 out:
 	if (!for_power_collapse)
 		mutex_unlock(&drv_state.lock);
 	return rc;
 }

 static void __init acpuclk_init(void)
 {
 	struct clkctl_acpu_speed *speed;
 	uint32_t div, sel;
 	int rc;

 	/*
 	 * Determine the rate of ACPU clock
 	 */

 	if (!(readl(A11S_CLK_SEL_ADDR) & 0x01)) { /* CLK_SEL_SRC1N0 */
 		/* CLK_SRC0_SEL */
 		sel = (readl(A11S_CLK_CNTL_ADDR) >> 12) & 0x7;
 		/* CLK_SRC0_DIV */
 		div = (readl(A11S_CLK_CNTL_ADDR) >> 8) & 0x0f;
 	} else {
 		/* CLK_SRC1_SEL */
 		sel = (readl(A11S_CLK_CNTL_ADDR) >> 4) & 0x07;
 		/* CLK_SRC1_DIV */
 		div = readl(A11S_CLK_CNTL_ADDR) & 0x0f;
 	}

 	for (speed = acpu_freq_tbl; speed->a11clk_khz != 0; speed++) {
 		if (speed->a11clk_src_sel == sel
 		 && (speed->a11clk_src_div == div))
 			break;
 	}
 	if (speed->a11clk_khz == 0) {
 		printk(KERN_WARNING "Warning - ACPU clock reports invalid speed\n");
 		return;
 	}

 	drv_state.current_speed = speed;

 	rc = clk_set_rate(ebi1_clk, speed->axiclk_khz * 1000);
 	if (rc < 0)
 		pr_err("Setting AXI min rate failed!\n");

 	printk(KERN_INFO "ACPU running at %d KHz\n", speed->a11clk_khz);
 }

 unsigned long acpuclk_get_rate(void)
 {
 	WARN_ONCE(drv_state.current_speed == NULL,
 		  "acpuclk_get_rate: not initialized\n");
 	if (drv_state.current_speed)
 		return drv_state.current_speed->a11clk_khz;
 	else
 		return 0;
 }

 uint32_t acpuclk_get_switch_time(void)
 {
 	return drv_state.acpu_switch_time_us;
 }

 /*----------------------------------------------------------------------------
  * Clock driver initialization
  *---------------------------------------------------------------------------*/

 /* Initalize the lpj field in the acpu_freq_tbl. */
 static void __init lpj_init(void)
 {
 	int i;
 	const struct clkctl_acpu_speed *base_clk = drv_state.current_speed;
 	for (i = 0; acpu_freq_tbl[i].a11clk_khz; i++) {
 		acpu_freq_tbl[i].lpj = cpufreq_scale(loops_per_jiffy,
 						base_clk->a11clk_khz,
 						acpu_freq_tbl[i].a11clk_khz);
 	}
 }

 void __init msm_acpu_clock_init(struct msm_acpu_clock_platform_data *clkdata)
 {
 	pr_info("acpu_clock_init()\n");

 	ebi1_clk = clk_get(NULL, "ebi1_clk");

 	mutex_init(&drv_state.lock);
 	drv_state.acpu_switch_time_us = clkdata->acpu_switch_time_us;
 	drv_state.max_speed_delta_khz = clkdata->max_speed_delta_khz;
 	drv_state.vdd_switch_time_us = clkdata->vdd_switch_time_us;
 	drv_state.power_collapse_khz = clkdata->power_collapse_khz;
 	drv_state.wait_for_irq_khz = clkdata->wait_for_irq_khz;
 	acpuclk_init();
 	lpj_init();
 #ifdef CONFIG_CPU_FREQ_TABLE
 	cpufreq_frequency_table_get_attr(freq_table, smp_processor_id());
 #endif
 }
	/* arch/arm/mach-msm/acpuclock.c
	*
	* MSM architecture clock driver
	*
	* Copyright (C) 2007 Google, Inc.
	* Copyright (c) 2007 QUALCOMM Incorporated
	* Author: San Mehat <san@android.com>
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* 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.
	*
	*/

	#include <linux/version.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/list.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/delay.h>
	#include <linux/clk.h>
	#include <linux/cpufreq.h>
	#include <linux/mutex.h>
	#include <linux/io.h>
	#include <mach/board.h>
	#include <mach/msm_iomap.h>
	#include <mach/proc_comm.h>

	#include "acpuclock.h"


	#define A11S_CLK_CNTL_ADDR (MSM_CSR_BASE + 0x100)
	#define A11S_CLK_SEL_ADDR (MSM_CSR_BASE + 0x104)
	#define A11S_VDD_SVS_PLEVEL_ADDR (MSM_CSR_BASE + 0x124)

	/*
	* ARM11 clock configuration for specific ACPU speeds
	*/

	#define ACPU_PLL_TCXO -1
	#define ACPU_PLL_0 0
	#define ACPU_PLL_1 1
	#define ACPU_PLL_2 2
	#define ACPU_PLL_3 3

	#define PERF_SWITCH_DEBUG 0
	#define PERF_SWITCH_STEP_DEBUG 0

	struct clock_state
	{
	struct clkctl_acpu_speed *current_speed;
	struct mutex lock;
	uint32_t acpu_switch_time_us;
	uint32_t max_speed_delta_khz;
	uint32_t vdd_switch_time_us;
	unsigned long power_collapse_khz;
	unsigned long wait_for_irq_khz;
	};

	static struct clk *ebi1_clk;
	static struct clock_state drv_state = { 0 };

	static void __init acpuclk_init(void);

	/* MSM7201A Levels 3-6 all correspond to 1.2V, level 7 corresponds to 1.325V. */
	enum {
	VDD_0 = 0,
	VDD_1 = 1,
	VDD_2 = 2,
	VDD_3 = 3,
	VDD_4 = 3,
	VDD_5 = 3,
	VDD_6 = 3,
	VDD_7 = 7,
	VDD_END
	};

	struct clkctl_acpu_speed {
	unsigned int a11clk_khz;
	int pll;
	unsigned int a11clk_src_sel;
	unsigned int a11clk_src_div;
	unsigned int ahbclk_khz;
	unsigned int ahbclk_div;
	int vdd;
	unsigned int axiclk_khz;
	unsigned long lpj; /* loops_per_jiffy */
	/* Index in acpu_freq_tbl[] for steppings. */
	short down;
	short up;
	};

	/*
	* ACPU speed table. Complete table is shown but certain speeds are commented
	* out to optimized speed switching. Initalize loops_per_jiffy to 0.
	*
	* Table stepping up/down is optimized for 256mhz jumps while staying on the
	* same PLL.
	*/
	#if (0)
	static struct clkctl_acpu_speed acpu_freq_tbl[] = {
	{ 19200, ACPU_PLL_TCXO, 0, 0, 19200, 0, VDD_0, 30720, 0, 0, 8 },
	{ 61440, ACPU_PLL_0, 4, 3, 61440, 0, VDD_0, 30720, 0, 0, 8 },
	{ 81920, ACPU_PLL_0, 4, 2, 40960, 1, VDD_0, 61440, 0, 0, 8 },
	{ 96000, ACPU_PLL_1, 1, 7, 48000, 1, VDD_0, 61440, 0, 0, 9 },
	{ 122880, ACPU_PLL_0, 4, 1, 61440, 1, VDD_3, 61440, 0, 0, 8 },
	{ 128000, ACPU_PLL_1, 1, 5, 64000, 1, VDD_3, 61440, 0, 0, 12 },
	{ 176000, ACPU_PLL_2, 2, 5, 88000, 1, VDD_3, 61440, 0, 0, 11 },
	{ 192000, ACPU_PLL_1, 1, 3, 64000, 2, VDD_3, 61440, 0, 0, 12 },
	{ 245760, ACPU_PLL_0, 4, 0, 81920, 2, VDD_4, 61440, 0, 0, 12 },
	{ 256000, ACPU_PLL_1, 1, 2, 128000, 2, VDD_5, 128000, 0, 0, 12 },
	{ 264000, ACPU_PLL_2, 2, 3, 88000, 2, VDD_5, 128000, 0, 6, 13 },
	{ 352000, ACPU_PLL_2, 2, 2, 88000, 3, VDD_5, 128000, 0, 6, 13 },
	{ 384000, ACPU_PLL_1, 1, 1, 128000, 2, VDD_6, 128000, 0, 5, -1 },
	{ 528000, ACPU_PLL_2, 2, 1, 132000, 3, VDD_7, 128000, 0, 11, -1 },
	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
	};
	#else /* Table of freq we currently use. */
	static struct clkctl_acpu_speed acpu_freq_tbl[] = {
	{ 19200, ACPU_PLL_TCXO, 0, 0, 19200, 0, VDD_0, 30720, 0, 0, 4 },
	{ 122880, ACPU_PLL_0, 4, 1, 61440, 1, VDD_3, 61440, 0, 0, 4 },
	{ 128000, ACPU_PLL_1, 1, 5, 64000, 1, VDD_3, 61440, 0, 0, 6 },
	{ 176000, ACPU_PLL_2, 2, 5, 88000, 1, VDD_3, 61440, 0, 0, 5 },
	{ 245760, ACPU_PLL_0, 4, 0, 81920, 2, VDD_4, 61440, 0, 0, 5 },
	{ 352000, ACPU_PLL_2, 2, 2, 88000, 3, VDD_5, 128000, 0, 3, 7 },
	{ 384000, ACPU_PLL_1, 1, 1, 128000, 2, VDD_6, 128000, 0, 2, -1 },
	{ 528000, ACPU_PLL_2, 2, 1, 132000, 3, VDD_7, 128000, 0, 5, -1 },
	{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
	};
	#endif


	#ifdef CONFIG_CPU_FREQ_TABLE
	static struct cpufreq_frequency_table freq_table[] = {
	{ 0, 122880 },
	{ 1, 128000 },
	{ 2, 245760 },
	{ 3, 384000 },
	{ 4, 528000 },
	{ 5, CPUFREQ_TABLE_END },
	};
	#endif

	static int pc_pll_request(unsigned id, unsigned on)
	{
	int res;
	on = !!on;

	#if PERF_SWITCH_DEBUG
	if (on)
	printk(KERN_DEBUG "Enabling PLL %d\n", id);
	else
	printk(KERN_DEBUG "Disabling PLL %d\n", id);
	#endif

	res = msm_proc_comm(PCOM_CLKCTL_RPC_PLL_REQUEST, &id, &on);
	if (res < 0)
	return res;

	#if PERF_SWITCH_DEBUG
	if (on)
	printk(KERN_DEBUG "PLL %d enabled\n", id);
	else
	printk(KERN_DEBUG "PLL %d disabled\n", id);
	#endif
	return res;
	}


	/*----------------------------------------------------------------------------
	* ARM11 'owned' clock control
	---------------------------------------------------------------------------/

	unsigned long acpuclk_power_collapse(void) {
	int ret = acpuclk_get_rate();
	ret *= 1000;
	if (ret > drv_state.power_collapse_khz)
	acpuclk_set_rate(drv_state.power_collapse_khz, 1);
	return ret;
	}

	unsigned long acpuclk_get_wfi_rate(void)
	{
	return drv_state.wait_for_irq_khz;
	}

	unsigned long acpuclk_wait_for_irq(void) {
	int ret = acpuclk_get_rate();
	ret *= 1000;
	if (ret > drv_state.wait_for_irq_khz)
	acpuclk_set_rate(drv_state.wait_for_irq_khz, 1);
	return ret;
	}

	static int acpuclk_set_vdd_level(int vdd)
	{
	uint32_t current_vdd;

	current_vdd = readl(A11S_VDD_SVS_PLEVEL_ADDR) & 0x07;

	#if PERF_SWITCH_DEBUG
	printk(KERN_DEBUG "acpuclock: Switching VDD from %u -> %d\n",
	current_vdd, vdd);
	#endif
	writel((1 << 7) \| (vdd << 3), A11S_VDD_SVS_PLEVEL_ADDR);
	udelay(drv_state.vdd_switch_time_us);
	if ((readl(A11S_VDD_SVS_PLEVEL_ADDR) & 0x7) != vdd) {
	#if PERF_SWITCH_DEBUG
	printk(KERN_ERR "acpuclock: VDD set failed\n");
	#endif
	return -EIO;
	}

	#if PERF_SWITCH_DEBUG
	printk(KERN_DEBUG "acpuclock: VDD switched\n");
	#endif
	return 0;
	}

	/* Set proper dividers for the given clock speed. */
	static void acpuclk_set_div(const struct clkctl_acpu_speed *hunt_s) {
	uint32_t reg_clkctl, reg_clksel, clk_div;

	/* AHB_CLK_DIV */
	clk_div = (readl(A11S_CLK_SEL_ADDR) >> 1) & 0x03;
	/*
	* If the new clock divider is higher than the previous, then
	* program the divider before switching the clock
	*/
	if (hunt_s->ahbclk_div > clk_div) {
	reg_clksel = readl(A11S_CLK_SEL_ADDR);
	reg_clksel &= ~(0x3 << 1);
	reg_clksel \|= (hunt_s->ahbclk_div << 1);
	writel(reg_clksel, A11S_CLK_SEL_ADDR);
	}
	if ((readl(A11S_CLK_SEL_ADDR) & 0x01) == 0) {
	/* SRC0 */

	/* Program clock source */
	reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
	reg_clkctl &= ~(0x07 << 4);
	reg_clkctl \|= (hunt_s->a11clk_src_sel << 4);
	writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

	/* Program clock divider */
	reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
	reg_clkctl &= ~0xf;
	reg_clkctl \|= hunt_s->a11clk_src_div;
	writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

	/* Program clock source selection */
	reg_clksel = readl(A11S_CLK_SEL_ADDR);
	reg_clksel \|= 1; /* CLK_SEL_SRC1NO == SRC1 */
	writel(reg_clksel, A11S_CLK_SEL_ADDR);
	} else {
	/* SRC1 */

	/* Program clock source */
	reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
	reg_clkctl &= ~(0x07 << 12);
	reg_clkctl \|= (hunt_s->a11clk_src_sel << 12);
	writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

	/* Program clock divider */
	reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
	reg_clkctl &= ~(0xf << 8);
	reg_clkctl \|= (hunt_s->a11clk_src_div << 8);
	writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

	/* Program clock source selection */
	reg_clksel = readl(A11S_CLK_SEL_ADDR);
	reg_clksel &= ~1; /* CLK_SEL_SRC1NO == SRC0 */
	writel(reg_clksel, A11S_CLK_SEL_ADDR);
	}

	/*
	* If the new clock divider is lower than the previous, then
	* program the divider after switching the clock
	*/
	if (hunt_s->ahbclk_div < clk_div) {
	reg_clksel = readl(A11S_CLK_SEL_ADDR);
	reg_clksel &= ~(0x3 << 1);
	reg_clksel \|= (hunt_s->ahbclk_div << 1);
	writel(reg_clksel, A11S_CLK_SEL_ADDR);
	}
	}

	int acpuclk_set_rate(unsigned long rate, int for_power_collapse)
	{
	uint32_t reg_clkctl;
	struct clkctl_acpu_speed cur_s, tgt_s, *strt_s;
	int rc = 0;
	unsigned int plls_enabled = 0, pll;

	strt_s = cur_s = drv_state.current_speed;

	WARN_ONCE(cur_s == NULL, "acpuclk_set_rate: not initialized\n");
	if (cur_s == NULL)
	return -ENOENT;

	if (rate == (cur_s->a11clk_khz * 1000))
	return 0;

	for (tgt_s = acpu_freq_tbl; tgt_s->a11clk_khz != 0; tgt_s++) {
	if (tgt_s->a11clk_khz == (rate / 1000))
	break;
	}

	if (tgt_s->a11clk_khz == 0)
	return -EINVAL;

	/* Choose the highest speed speed at or below 'rate' with same PLL. */
	if (for_power_collapse && tgt_s->a11clk_khz < cur_s->a11clk_khz) {
	while (tgt_s->pll != ACPU_PLL_TCXO && tgt_s->pll != cur_s->pll)
	tgt_s--;
	}

	if (strt_s->pll != ACPU_PLL_TCXO)
	plls_enabled \|= 1 << strt_s->pll;

	if (!for_power_collapse) {
	mutex_lock(&drv_state.lock);
	if (strt_s->pll != tgt_s->pll && tgt_s->pll != ACPU_PLL_TCXO) {
	rc = pc_pll_request(tgt_s->pll, 1);
	if (rc < 0) {
	pr_err("PLL%d enable failed (%d)\n",
	tgt_s->pll, rc);
	goto out;
	}
	plls_enabled \|= 1 << tgt_s->pll;
	}
	/* Increase VDD if needed. */
	if (tgt_s->vdd > cur_s->vdd) {
	if ((rc = acpuclk_set_vdd_level(tgt_s->vdd)) < 0) {
	printk(KERN_ERR "Unable to switch ACPU vdd\n");
	goto out;
	}
	}
	}

	/* Set wait states for CPU between frequency changes */
	reg_clkctl = readl(A11S_CLK_CNTL_ADDR);
	reg_clkctl \|= (100 << 16); /* set WT_ST_CNT */
	writel(reg_clkctl, A11S_CLK_CNTL_ADDR);

	#if PERF_SWITCH_DEBUG
	printk(KERN_INFO "acpuclock: Switching from ACPU rate %u -> %u\n",
	strt_s->a11clk_khz * 1000, tgt_s->a11clk_khz * 1000);
	#endif

	while (cur_s != tgt_s) {
	/*
	* Always jump to target freq if within 256mhz, regulardless of
	* PLL. If differnece is greater, use the predefinied
	* steppings in the table.
	*/
	int d = abs((int)(cur_s->a11clk_khz - tgt_s->a11clk_khz));
	if (d > drv_state.max_speed_delta_khz) {
	/* Step up or down depending on target vs current. */
	int clk_index = tgt_s->a11clk_khz > cur_s->a11clk_khz ?
	cur_s->up : cur_s->down;
	if (clk_index < 0) { /* This should not happen. */
	printk(KERN_ERR "cur:%u target: %u\n",
	cur_s->a11clk_khz, tgt_s->a11clk_khz);
	rc = -EINVAL;
	goto out;
	}
	cur_s = &acpu_freq_tbl[clk_index];
	} else {
	cur_s = tgt_s;
	}
	#if PERF_SWITCH_STEP_DEBUG
	printk(KERN_DEBUG "%s: STEP khz = %u, pll = %d\n",
	__FUNCTION__, cur_s->a11clk_khz, cur_s->pll);
	#endif
	if (!for_power_collapse&& cur_s->pll != ACPU_PLL_TCXO
	&& !(plls_enabled & (1 << cur_s->pll))) {
	rc = pc_pll_request(cur_s->pll, 1);
	if (rc < 0) {
	pr_err("PLL%d enable failed (%d)\n",
	cur_s->pll, rc);
	goto out;
	}
	plls_enabled \|= 1 << cur_s->pll;
	}

	acpuclk_set_div(cur_s);
	drv_state.current_speed = cur_s;
	/* Re-adjust lpj for the new clock speed. */
	loops_per_jiffy = cur_s->lpj;
	udelay(drv_state.acpu_switch_time_us);
	}

	/* Nothing else to do for power collapse. */
	if (for_power_collapse)
	return 0;

	/* Disable PLLs we are not using anymore. */
	plls_enabled &= ~(1 << tgt_s->pll);
	for (pll = ACPU_PLL_0; pll <= ACPU_PLL_2; pll++)
	if (plls_enabled & (1 << pll)) {
	rc = pc_pll_request(pll, 0);
	if (rc < 0) {
	pr_err("PLL%d disable failed (%d)\n", pll, rc);
	goto out;
	}
	}

	/* Change the AXI bus frequency if we can. */
	if (strt_s->axiclk_khz != tgt_s->axiclk_khz) {
	rc = clk_set_rate(ebi1_clk, tgt_s->axiclk_khz * 1000);
	if (rc < 0)
	pr_err("Setting AXI min rate failed!\n");
	}

	/* Drop VDD level if we can. */
	if (tgt_s->vdd < strt_s->vdd) {
	if (acpuclk_set_vdd_level(tgt_s->vdd) < 0)
	printk(KERN_ERR "acpuclock: Unable to drop ACPU vdd\n");
	}

	#if PERF_SWITCH_DEBUG
	printk(KERN_DEBUG "%s: ACPU speed change complete\n", __FUNCTION__);
	#endif
	out:
	if (!for_power_collapse)
	mutex_unlock(&drv_state.lock);
	return rc;
	}

	static void __init acpuclk_init(void)
	{
	struct clkctl_acpu_speed *speed;
	uint32_t div, sel;
	int rc;

	/*
	* Determine the rate of ACPU clock
	*/

	if (!(readl(A11S_CLK_SEL_ADDR) & 0x01)) { /* CLK_SEL_SRC1N0 */
	/* CLK_SRC0_SEL */
	sel = (readl(A11S_CLK_CNTL_ADDR) >> 12) & 0x7;
	/* CLK_SRC0_DIV */
	div = (readl(A11S_CLK_CNTL_ADDR) >> 8) & 0x0f;
	} else {
	/* CLK_SRC1_SEL */
	sel = (readl(A11S_CLK_CNTL_ADDR) >> 4) & 0x07;
	/* CLK_SRC1_DIV */
	div = readl(A11S_CLK_CNTL_ADDR) & 0x0f;
	}

	for (speed = acpu_freq_tbl; speed->a11clk_khz != 0; speed++) {
	if (speed->a11clk_src_sel == sel
	&& (speed->a11clk_src_div == div))
	break;
	}
	if (speed->a11clk_khz == 0) {
	printk(KERN_WARNING "Warning - ACPU clock reports invalid speed\n");
	return;
	}

	drv_state.current_speed = speed;

	rc = clk_set_rate(ebi1_clk, speed->axiclk_khz * 1000);
	if (rc < 0)
	pr_err("Setting AXI min rate failed!\n");

	printk(KERN_INFO "ACPU running at %d KHz\n", speed->a11clk_khz);
	}

	unsigned long acpuclk_get_rate(void)
	{
	WARN_ONCE(drv_state.current_speed == NULL,
	"acpuclk_get_rate: not initialized\n");
	if (drv_state.current_speed)
	return drv_state.current_speed->a11clk_khz;
	else
	return 0;
	}

	uint32_t acpuclk_get_switch_time(void)
	{
	return drv_state.acpu_switch_time_us;
	}

	/*----------------------------------------------------------------------------
	* Clock driver initialization
	---------------------------------------------------------------------------/

	/* Initalize the lpj field in the acpu_freq_tbl. */
	static void __init lpj_init(void)
	{
	int i;
	const struct clkctl_acpu_speed *base_clk = drv_state.current_speed;
	for (i = 0; acpu_freq_tbl[i].a11clk_khz; i++) {
	acpu_freq_tbl[i].lpj = cpufreq_scale(loops_per_jiffy,
	base_clk->a11clk_khz,
	acpu_freq_tbl[i].a11clk_khz);
	}
	}

	void __init msm_acpu_clock_init(struct msm_acpu_clock_platform_data *clkdata)
	{
	pr_info("acpu_clock_init()\n");

	ebi1_clk = clk_get(NULL, "ebi1_clk");

	mutex_init(&drv_state.lock);
	drv_state.acpu_switch_time_us = clkdata->acpu_switch_time_us;
	drv_state.max_speed_delta_khz = clkdata->max_speed_delta_khz;
	drv_state.vdd_switch_time_us = clkdata->vdd_switch_time_us;
	drv_state.power_collapse_khz = clkdata->power_collapse_khz;
	drv_state.wait_for_irq_khz = clkdata->wait_for_irq_khz;
	acpuclk_init();
	lpj_init();
	#ifdef CONFIG_CPU_FREQ_TABLE
	cpufreq_frequency_table_get_attr(freq_table, smp_processor_id());
	#endif
	}