+++ /dev/null
-/* 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/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 "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. Initialize 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
- *---------------------------------------------------------------------------*/
-
-/* Initialize 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
-}
git.openpandora.org / pandora-kernel.git / commitdiff