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-/*
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- * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
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- */
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-
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-/*
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- * The code contained herein is licensed under the GNU General Public
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- * License. You may obtain a copy of the GNU General Public License
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- * Version 2 or later at the following locations:
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- *
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- * http://www.opensource.org/licenses/gpl-license.html
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- * http://www.gnu.org/copyleft/gpl.html
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- */
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-
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-/*
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- * A driver for the Freescale Semiconductor i.MXC CPUfreq module.
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- * The CPUFREQ driver is for controlling CPU frequency. It allows you to change
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- * the CPU clock speed on the fly.
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- */
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-
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-#include <linux/module.h>
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-#include <linux/cpufreq.h>
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-#include <linux/clk.h>
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-#include <linux/err.h>
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-#include <linux/slab.h>
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-
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-#include "hardware.h"
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-
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-#define CLK32_FREQ 32768
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-#define NANOSECOND (1000 * 1000 * 1000)
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-
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-struct cpu_op *(*get_cpu_op)(int *op);
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-
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-static int cpu_freq_khz_min;
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-static int cpu_freq_khz_max;
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-
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-static struct clk *cpu_clk;
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-static struct cpufreq_frequency_table *imx_freq_table;
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-
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-static int cpu_op_nr;
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-static struct cpu_op *cpu_op_tbl;
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-
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-static int set_cpu_freq(int freq)
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-{
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- int ret = 0;
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- int org_cpu_rate;
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-
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- org_cpu_rate = clk_get_rate(cpu_clk);
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- if (org_cpu_rate == freq)
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- return ret;
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-
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- ret = clk_set_rate(cpu_clk, freq);
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- if (ret != 0) {
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- printk(KERN_DEBUG "cannot set CPU clock rate\n");
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- return ret;
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- }
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-
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- return ret;
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-}
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-
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-static int mxc_verify_speed(struct cpufreq_policy *policy)
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-{
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- if (policy->cpu != 0)
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- return -EINVAL;
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-
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- return cpufreq_frequency_table_verify(policy, imx_freq_table);
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-}
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-
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-static unsigned int mxc_get_speed(unsigned int cpu)
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-{
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- if (cpu)
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- return 0;
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-
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- return clk_get_rate(cpu_clk) / 1000;
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-}
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-
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-static int mxc_set_target(struct cpufreq_policy *policy,
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- unsigned int target_freq, unsigned int relation)
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-{
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- struct cpufreq_freqs freqs;
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- int freq_Hz;
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- int ret = 0;
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- unsigned int index;
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-
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- cpufreq_frequency_table_target(policy, imx_freq_table,
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- target_freq, relation, &index);
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- freq_Hz = imx_freq_table[index].frequency * 1000;
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-
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- freqs.old = clk_get_rate(cpu_clk) / 1000;
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- freqs.new = freq_Hz / 1000;
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- freqs.cpu = 0;
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- freqs.flags = 0;
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- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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-
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- ret = set_cpu_freq(freq_Hz);
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-
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- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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-
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- return ret;
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-}
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-
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-static int mxc_cpufreq_init(struct cpufreq_policy *policy)
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-{
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- int ret;
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- int i;
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-
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- printk(KERN_INFO "i.MXC CPU frequency driver\n");
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-
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- if (policy->cpu != 0)
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- return -EINVAL;
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-
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- if (!get_cpu_op)
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- return -EINVAL;
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-
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- cpu_clk = clk_get(NULL, "cpu_clk");
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- if (IS_ERR(cpu_clk)) {
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- printk(KERN_ERR "%s: failed to get cpu clock\n", __func__);
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- return PTR_ERR(cpu_clk);
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- }
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-
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- cpu_op_tbl = get_cpu_op(&cpu_op_nr);
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-
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- cpu_freq_khz_min = cpu_op_tbl[0].cpu_rate / 1000;
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- cpu_freq_khz_max = cpu_op_tbl[0].cpu_rate / 1000;
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-
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- imx_freq_table = kmalloc(
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- sizeof(struct cpufreq_frequency_table) * (cpu_op_nr + 1),
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- GFP_KERNEL);
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- if (!imx_freq_table) {
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- ret = -ENOMEM;
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- goto err1;
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- }
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-
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- for (i = 0; i < cpu_op_nr; i++) {
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- imx_freq_table[i].index = i;
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- imx_freq_table[i].frequency = cpu_op_tbl[i].cpu_rate / 1000;
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-
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- if ((cpu_op_tbl[i].cpu_rate / 1000) < cpu_freq_khz_min)
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- cpu_freq_khz_min = cpu_op_tbl[i].cpu_rate / 1000;
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-
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- if ((cpu_op_tbl[i].cpu_rate / 1000) > cpu_freq_khz_max)
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- cpu_freq_khz_max = cpu_op_tbl[i].cpu_rate / 1000;
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- }
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-
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- imx_freq_table[i].index = i;
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- imx_freq_table[i].frequency = CPUFREQ_TABLE_END;
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-
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- policy->cur = clk_get_rate(cpu_clk) / 1000;
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- policy->min = policy->cpuinfo.min_freq = cpu_freq_khz_min;
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- policy->max = policy->cpuinfo.max_freq = cpu_freq_khz_max;
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-
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- /* Manual states, that PLL stabilizes in two CLK32 periods */
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- policy->cpuinfo.transition_latency = 2 * NANOSECOND / CLK32_FREQ;
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-
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- ret = cpufreq_frequency_table_cpuinfo(policy, imx_freq_table);
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-
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- if (ret < 0) {
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- printk(KERN_ERR "%s: failed to register i.MXC CPUfreq with error code %d\n",
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- __func__, ret);
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- goto err;
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- }
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-
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- cpufreq_frequency_table_get_attr(imx_freq_table, policy->cpu);
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- return 0;
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-err:
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- kfree(imx_freq_table);
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-err1:
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- clk_put(cpu_clk);
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- return ret;
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-}
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-
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-static int mxc_cpufreq_exit(struct cpufreq_policy *policy)
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-{
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- cpufreq_frequency_table_put_attr(policy->cpu);
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-
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- set_cpu_freq(cpu_freq_khz_max * 1000);
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- clk_put(cpu_clk);
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- kfree(imx_freq_table);
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- return 0;
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-}
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-
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-static struct cpufreq_driver mxc_driver = {
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- .flags = CPUFREQ_STICKY,
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- .verify = mxc_verify_speed,
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- .target = mxc_set_target,
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- .get = mxc_get_speed,
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- .init = mxc_cpufreq_init,
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- .exit = mxc_cpufreq_exit,
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- .name = "imx",
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-};
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-
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-static int mxc_cpufreq_driver_init(void)
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-{
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- return cpufreq_register_driver(&mxc_driver);
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-}
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-
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-static void mxc_cpufreq_driver_exit(void)
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-{
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- cpufreq_unregister_driver(&mxc_driver);
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-}
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-
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-module_init(mxc_cpufreq_driver_init);
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-module_exit(mxc_cpufreq_driver_exit);
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-
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-MODULE_AUTHOR("Freescale Semiconductor Inc. Yong Shen <yong.shen@linaro.org>");
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-MODULE_DESCRIPTION("CPUfreq driver for i.MX");
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-MODULE_LICENSE("GPL");
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