[linux-2.6-block.git] / drivers / cpufreq / imx6q-cpufreq.c

/*
 * Copyright (C) 2013 Freescale Semiconductor, 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.
 */

#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_opp.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>

#define PU_SOC_VOLTAGE_NORMAL	1250000
#define PU_SOC_VOLTAGE_HIGH	1275000
#define FREQ_1P2_GHZ		1200000000

static struct regulator *arm_reg;
static struct regulator *pu_reg;
static struct regulator *soc_reg;

static struct clk *arm_clk;
static struct clk *pll1_sys_clk;
static struct clk *pll1_sw_clk;
static struct clk *step_clk;
static struct clk *pll2_pfd2_396m_clk;

/* clk used by i.MX6UL */
static struct clk *pll2_bus_clk;
static struct clk *secondary_sel_clk;

static struct device *cpu_dev;
static bool free_opp;
static struct cpufreq_frequency_table *freq_table;
static unsigned int transition_latency;

static u32 *imx6_soc_volt;
static u32 soc_opp_count;

static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
{
	struct dev_pm_opp *opp;
	unsigned long freq_hz, volt, volt_old;
	unsigned int old_freq, new_freq;
	int ret;

	new_freq = freq_table[index].frequency;
	freq_hz = new_freq * 1000;
	old_freq = clk_get_rate(arm_clk) / 1000;

	rcu_read_lock();
	opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
	if (IS_ERR(opp)) {
		rcu_read_unlock();
		dev_err(cpu_dev, "failed to find OPP for %ld\n", freq_hz);
		return PTR_ERR(opp);
	}

	volt = dev_pm_opp_get_voltage(opp);
	rcu_read_unlock();
	volt_old = regulator_get_voltage(arm_reg);

	dev_dbg(cpu_dev, "%u MHz, %ld mV --> %u MHz, %ld mV\n",
		old_freq / 1000, volt_old / 1000,
		new_freq / 1000, volt / 1000);

	/* scaling up?  scale voltage before frequency */
	if (new_freq > old_freq) {
		if (!IS_ERR(pu_reg)) {
			ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0);
			if (ret) {
				dev_err(cpu_dev, "failed to scale vddpu up: %d\n", ret);
				return ret;
			}
		}
		ret = regulator_set_voltage_tol(soc_reg, imx6_soc_volt[index], 0);
		if (ret) {
			dev_err(cpu_dev, "failed to scale vddsoc up: %d\n", ret);
			return ret;
		}
		ret = regulator_set_voltage_tol(arm_reg, volt, 0);
		if (ret) {
			dev_err(cpu_dev,
				"failed to scale vddarm up: %d\n", ret);
			return ret;
		}
	}

	/*
	 * The setpoints are selected per PLL/PDF frequencies, so we need to
	 * reprogram PLL for frequency scaling.  The procedure of reprogramming
	 * PLL1 is as below.
	 * For i.MX6UL, it has a secondary clk mux, the cpu frequency change
	 * flow is slightly different from other i.MX6 OSC.
	 * The cpu frequeny change flow for i.MX6(except i.MX6UL) is as below:
	 *  - Enable pll2_pfd2_396m_clk and reparent pll1_sw_clk to it
	 *  - Reprogram pll1_sys_clk and reparent pll1_sw_clk back to it
	 *  - Disable pll2_pfd2_396m_clk
	 */
	if (of_machine_is_compatible("fsl,imx6ul")) {
		/*
		 * When changing pll1_sw_clk's parent to pll1_sys_clk,
		 * CPU may run at higher than 528MHz, this will lead to
		 * the system unstable if the voltage is lower than the
		 * voltage of 528MHz, so lower the CPU frequency to one
		 * half before changing CPU frequency.
		 */
		clk_set_rate(arm_clk, (old_freq >> 1) * 1000);
		clk_set_parent(pll1_sw_clk, pll1_sys_clk);
		if (freq_hz > clk_get_rate(pll2_pfd2_396m_clk))
			clk_set_parent(secondary_sel_clk, pll2_bus_clk);
		else
			clk_set_parent(secondary_sel_clk, pll2_pfd2_396m_clk);
		clk_set_parent(step_clk, secondary_sel_clk);
		clk_set_parent(pll1_sw_clk, step_clk);
	} else {
		clk_set_parent(step_clk, pll2_pfd2_396m_clk);
		clk_set_parent(pll1_sw_clk, step_clk);
		if (freq_hz > clk_get_rate(pll2_pfd2_396m_clk)) {
			clk_set_rate(pll1_sys_clk, new_freq * 1000);
			clk_set_parent(pll1_sw_clk, pll1_sys_clk);
		}
	}

	/* Ensure the arm clock divider is what we expect */
	ret = clk_set_rate(arm_clk, new_freq * 1000);
	if (ret) {
		dev_err(cpu_dev, "failed to set clock rate: %d\n", ret);
		regulator_set_voltage_tol(arm_reg, volt_old, 0);
		return ret;
	}

	/* scaling down?  scale voltage after frequency */
	if (new_freq < old_freq) {
		ret = regulator_set_voltage_tol(arm_reg, volt, 0);
		if (ret) {
			dev_warn(cpu_dev,
				 "failed to scale vddarm down: %d\n", ret);
			ret = 0;
		}
		ret = regulator_set_voltage_tol(soc_reg, imx6_soc_volt[index], 0);
		if (ret) {
			dev_warn(cpu_dev, "failed to scale vddsoc down: %d\n", ret);
			ret = 0;
		}
		if (!IS_ERR(pu_reg)) {
			ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0);
			if (ret) {
				dev_warn(cpu_dev, "failed to scale vddpu down: %d\n", ret);
				ret = 0;
			}
		}
	}

	return 0;
}

static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
{
	policy->clk = arm_clk;
	return cpufreq_generic_init(policy, freq_table, transition_latency);
}

static struct cpufreq_driver imx6q_cpufreq_driver = {
	.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
	.verify = cpufreq_generic_frequency_table_verify,
	.target_index = imx6q_set_target,
	.get = cpufreq_generic_get,
	.init = imx6q_cpufreq_init,
	.name = "imx6q-cpufreq",
	.attr = cpufreq_generic_attr,
};

static int imx6q_cpufreq_probe(struct platform_device *pdev)
{
	struct device_node *np;
	struct dev_pm_opp *opp;
	unsigned long min_volt, max_volt;
	int num, ret;
	const struct property *prop;
	const __be32 *val;
	u32 nr, i, j;

	cpu_dev = get_cpu_device(0);
	if (!cpu_dev) {
		pr_err("failed to get cpu0 device\n");
		return -ENODEV;
	}

	np = of_node_get(cpu_dev->of_node);
	if (!np) {
		dev_err(cpu_dev, "failed to find cpu0 node\n");
		return -ENOENT;
	}

	arm_clk = clk_get(cpu_dev, "arm");
	pll1_sys_clk = clk_get(cpu_dev, "pll1_sys");
	pll1_sw_clk = clk_get(cpu_dev, "pll1_sw");
	step_clk = clk_get(cpu_dev, "step");
	pll2_pfd2_396m_clk = clk_get(cpu_dev, "pll2_pfd2_396m");
	if (IS_ERR(arm_clk) || IS_ERR(pll1_sys_clk) || IS_ERR(pll1_sw_clk) ||
	    IS_ERR(step_clk) || IS_ERR(pll2_pfd2_396m_clk)) {
		dev_err(cpu_dev, "failed to get clocks\n");
		ret = -ENOENT;
		goto put_clk;
	}

	if (of_machine_is_compatible("fsl,imx6ul")) {
		pll2_bus_clk = clk_get(cpu_dev, "pll2_bus");
		secondary_sel_clk = clk_get(cpu_dev, "secondary_sel");
		if (IS_ERR(pll2_bus_clk) || IS_ERR(secondary_sel_clk)) {
			dev_err(cpu_dev, "failed to get clocks specific to imx6ul\n");
			ret = -ENOENT;
			goto put_clk;
		}
	}

	arm_reg = regulator_get(cpu_dev, "arm");
	pu_reg = regulator_get_optional(cpu_dev, "pu");
	soc_reg = regulator_get(cpu_dev, "soc");
	if (IS_ERR(arm_reg) || IS_ERR(soc_reg)) {
		dev_err(cpu_dev, "failed to get regulators\n");
		ret = -ENOENT;
		goto put_reg;
	}

	/*
	 * We expect an OPP table supplied by platform.
	 * Just, incase the platform did not supply the OPP
	 * table, it will try to get it.
	 */
	num = dev_pm_opp_get_opp_count(cpu_dev);
	if (num < 0) {
		ret = dev_pm_opp_of_add_table(cpu_dev);
		if (ret < 0) {
			dev_err(cpu_dev, "failed to init OPP table: %d\n", ret);
			goto put_reg;
		}

		/* Because we have added the OPPs here, we must free them */
		free_opp = true;

		num = dev_pm_opp_get_opp_count(cpu_dev);
		if (num < 0) {
			ret = num;
			dev_err(cpu_dev, "no OPP table is found: %d\n", ret);
			goto out_free_opp;
		}
	}

	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
	if (ret) {
		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
		goto put_reg;
	}

	/* Make imx6_soc_volt array's size same as arm opp number */
	imx6_soc_volt = devm_kzalloc(cpu_dev, sizeof(*imx6_soc_volt) * num, GFP_KERNEL);
	if (imx6_soc_volt == NULL) {
		ret = -ENOMEM;
		goto free_freq_table;
	}

	prop = of_find_property(np, "fsl,soc-operating-points", NULL);
	if (!prop || !prop->value)
		goto soc_opp_out;

	/*
	 * Each OPP is a set of tuples consisting of frequency and
	 * voltage like <freq-kHz vol-uV>.
	 */
	nr = prop->length / sizeof(u32);
	if (nr % 2 || (nr / 2) < num)
		goto soc_opp_out;

	for (j = 0; j < num; j++) {
		val = prop->value;
		for (i = 0; i < nr / 2; i++) {
			unsigned long freq = be32_to_cpup(val++);
			unsigned long volt = be32_to_cpup(val++);
			if (freq_table[j].frequency == freq) {
				imx6_soc_volt[soc_opp_count++] = volt;
				break;
			}
		}
	}

soc_opp_out:
	/* use fixed soc opp volt if no valid soc opp info found in dtb */
	if (soc_opp_count != num) {
		dev_warn(cpu_dev, "can NOT find valid fsl,soc-operating-points property in dtb, use default value!\n");
		for (j = 0; j < num; j++)
			imx6_soc_volt[j] = PU_SOC_VOLTAGE_NORMAL;
		if (freq_table[num - 1].frequency * 1000 == FREQ_1P2_GHZ)
			imx6_soc_volt[num - 1] = PU_SOC_VOLTAGE_HIGH;
	}

	if (of_property_read_u32(np, "clock-latency", &transition_latency))
		transition_latency = CPUFREQ_ETERNAL;

	/*
	 * Calculate the ramp time for max voltage change in the
	 * VDDSOC and VDDPU regulators.
	 */
	ret = regulator_set_voltage_time(soc_reg, imx6_soc_volt[0], imx6_soc_volt[num - 1]);
	if (ret > 0)
		transition_latency += ret * 1000;
	if (!IS_ERR(pu_reg)) {
		ret = regulator_set_voltage_time(pu_reg, imx6_soc_volt[0], imx6_soc_volt[num - 1]);
		if (ret > 0)
			transition_latency += ret * 1000;
	}

	/*
	 * OPP is maintained in order of increasing frequency, and
	 * freq_table initialised from OPP is therefore sorted in the
	 * same order.
	 */
	rcu_read_lock();
	opp = dev_pm_opp_find_freq_exact(cpu_dev,
				  freq_table[0].frequency * 1000, true);
	min_volt = dev_pm_opp_get_voltage(opp);
	opp = dev_pm_opp_find_freq_exact(cpu_dev,
				  freq_table[--num].frequency * 1000, true);
	max_volt = dev_pm_opp_get_voltage(opp);
	rcu_read_unlock();
	ret = regulator_set_voltage_time(arm_reg, min_volt, max_volt);
	if (ret > 0)
		transition_latency += ret * 1000;

	ret = cpufreq_register_driver(&imx6q_cpufreq_driver);
	if (ret) {
		dev_err(cpu_dev, "failed register driver: %d\n", ret);
		goto free_freq_table;
	}

	of_node_put(np);
	return 0;

free_freq_table:
	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
out_free_opp:
	if (free_opp)
		dev_pm_opp_of_remove_table(cpu_dev);
put_reg:
	if (!IS_ERR(arm_reg))
		regulator_put(arm_reg);
	if (!IS_ERR(pu_reg))
		regulator_put(pu_reg);
	if (!IS_ERR(soc_reg))
		regulator_put(soc_reg);
put_clk:
	if (!IS_ERR(arm_clk))
		clk_put(arm_clk);
	if (!IS_ERR(pll1_sys_clk))
		clk_put(pll1_sys_clk);
	if (!IS_ERR(pll1_sw_clk))
		clk_put(pll1_sw_clk);
	if (!IS_ERR(step_clk))
		clk_put(step_clk);
	if (!IS_ERR(pll2_pfd2_396m_clk))
		clk_put(pll2_pfd2_396m_clk);
	if (!IS_ERR(pll2_bus_clk))
		clk_put(pll2_bus_clk);
	if (!IS_ERR(secondary_sel_clk))
		clk_put(secondary_sel_clk);
	of_node_put(np);
	return ret;
}

static int imx6q_cpufreq_remove(struct platform_device *pdev)
{
	cpufreq_unregister_driver(&imx6q_cpufreq_driver);
	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
	if (free_opp)
		dev_pm_opp_of_remove_table(cpu_dev);
	regulator_put(arm_reg);
	if (!IS_ERR(pu_reg))
		regulator_put(pu_reg);
	regulator_put(soc_reg);
	clk_put(arm_clk);
	clk_put(pll1_sys_clk);
	clk_put(pll1_sw_clk);
	clk_put(step_clk);
	clk_put(pll2_pfd2_396m_clk);
	clk_put(pll2_bus_clk);
	clk_put(secondary_sel_clk);

	return 0;
}

static struct platform_driver imx6q_cpufreq_platdrv = {
	.driver = {
		.name	= "imx6q-cpufreq",
	},
	.probe		= imx6q_cpufreq_probe,
	.remove		= imx6q_cpufreq_remove,
};
module_platform_driver(imx6q_cpufreq_platdrv);

MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
MODULE_DESCRIPTION("Freescale i.MX6Q cpufreq driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1dd538f0 SG	1	/*
	2	* Copyright (C) 2013 Freescale Semiconductor, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#include <linux/clk.h>
b494b48d	10	#include <linux/cpu.h>
1dd538f0	11	#include <linux/cpufreq.h>
1dd538f0 SG	12	#include <linux/err.h>
	13	#include <linux/module.h>
	14	#include <linux/of.h>
e4db1c74	15	#include <linux/pm_opp.h>
1dd538f0 SG	16	#include <linux/platform_device.h>
	17	#include <linux/regulator/consumer.h>
	18
	19	#define PU_SOC_VOLTAGE_NORMAL 1250000
	20	#define PU_SOC_VOLTAGE_HIGH 1275000
	21	#define FREQ_1P2_GHZ 1200000000
	22
	23	static struct regulator *arm_reg;
	24	static struct regulator *pu_reg;
	25	static struct regulator *soc_reg;
	26
	27	static struct clk *arm_clk;
	28	static struct clk *pll1_sys_clk;
	29	static struct clk *pll1_sw_clk;
	30	static struct clk *step_clk;
	31	static struct clk *pll2_pfd2_396m_clk;
	32
a35fc5a3 BP	33	/* clk used by i.MX6UL */
	34	static struct clk *pll2_bus_clk;
	35	static struct clk *secondary_sel_clk;
	36
1dd538f0	37	static struct device *cpu_dev;
cc87b8a8	38	static bool free_opp;
1dd538f0 SG	39	static struct cpufreq_frequency_table *freq_table;
	40	static unsigned int transition_latency;
	41
b4573d1d AH	42	static u32 *imx6_soc_volt;
	43	static u32 soc_opp_count;
	44
9c0ebcf7	45	static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
1dd538f0	46	{
47d43ba7	47	struct dev_pm_opp *opp;
1dd538f0	48	unsigned long freq_hz, volt, volt_old;
d4019f0a	49	unsigned int old_freq, new_freq;
1dd538f0 SG	50	int ret;
1dd538f0 SG	51
d4019f0a VK	52	new_freq = freq_table[index].frequency;
	53	freq_hz = new_freq * 1000;
	54	old_freq = clk_get_rate(arm_clk) / 1000;
1dd538f0	55
1dd538f0	56	rcu_read_lock();
5d4879cd	57	opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
1dd538f0 SG	58	if (IS_ERR(opp)) {
	59	rcu_read_unlock();
	60	dev_err(cpu_dev, "failed to find OPP for %ld\n", freq_hz);
	61	return PTR_ERR(opp);
	62	}
	63
5d4879cd	64	volt = dev_pm_opp_get_voltage(opp);
1dd538f0 SG	65	rcu_read_unlock();
	66	volt_old = regulator_get_voltage(arm_reg);
	67
	68	dev_dbg(cpu_dev, "%u MHz, %ld mV --> %u MHz, %ld mV\n",
d4019f0a VK	69	old_freq / 1000, volt_old / 1000,
d4019f0a VK	70	new_freq / 1000, volt / 1000);
5a571c35	71
1dd538f0	72	/* scaling up? scale voltage before frequency */
d4019f0a	73	if (new_freq > old_freq) {
22d0628a AH	74	if (!IS_ERR(pu_reg)) {
	75	ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0);
	76	if (ret) {
	77	dev_err(cpu_dev, "failed to scale vddpu up: %d\n", ret);
	78	return ret;
	79	}
b4573d1d AH	80	}
	81	ret = regulator_set_voltage_tol(soc_reg, imx6_soc_volt[index], 0);
	82	if (ret) {
	83	dev_err(cpu_dev, "failed to scale vddsoc up: %d\n", ret);
	84	return ret;
	85	}
1dd538f0 SG	86	ret = regulator_set_voltage_tol(arm_reg, volt, 0);
	87	if (ret) {
	88	dev_err(cpu_dev,
	89	"failed to scale vddarm up: %d\n", ret);
d4019f0a	90	return ret;
1dd538f0	91	}
1dd538f0 SG	92	}
	93
	94	/*
	95	* The setpoints are selected per PLL/PDF frequencies, so we need to
	96	* reprogram PLL for frequency scaling. The procedure of reprogramming
	97	* PLL1 is as below.
a35fc5a3 BP	98	* For i.MX6UL, it has a secondary clk mux, the cpu frequency change
	99	* flow is slightly different from other i.MX6 OSC.
	100	* The cpu frequeny change flow for i.MX6(except i.MX6UL) is as below:
1dd538f0 SG	101	* - Enable pll2_pfd2_396m_clk and reparent pll1_sw_clk to it
	102	* - Reprogram pll1_sys_clk and reparent pll1_sw_clk back to it
	103	* - Disable pll2_pfd2_396m_clk
	104	*/
a35fc5a3 BP	105	if (of_machine_is_compatible("fsl,imx6ul")) {
	106	/*
	107	* When changing pll1_sw_clk's parent to pll1_sys_clk,
	108	* CPU may run at higher than 528MHz, this will lead to
	109	* the system unstable if the voltage is lower than the
	110	* voltage of 528MHz, so lower the CPU frequency to one
	111	* half before changing CPU frequency.
	112	*/
	113	clk_set_rate(arm_clk, (old_freq >> 1) * 1000);
1dd538f0	114	clk_set_parent(pll1_sw_clk, pll1_sys_clk);
a35fc5a3 BP	115	if (freq_hz > clk_get_rate(pll2_pfd2_396m_clk))
	116	clk_set_parent(secondary_sel_clk, pll2_bus_clk);
	117	else
	118	clk_set_parent(secondary_sel_clk, pll2_pfd2_396m_clk);
	119	clk_set_parent(step_clk, secondary_sel_clk);
	120	clk_set_parent(pll1_sw_clk, step_clk);
	121	} else {
	122	clk_set_parent(step_clk, pll2_pfd2_396m_clk);
	123	clk_set_parent(pll1_sw_clk, step_clk);
	124	if (freq_hz > clk_get_rate(pll2_pfd2_396m_clk)) {
	125	clk_set_rate(pll1_sys_clk, new_freq * 1000);
	126	clk_set_parent(pll1_sw_clk, pll1_sys_clk);
	127	}
1dd538f0 SG	128	}
	129
	130	/* Ensure the arm clock divider is what we expect */
d4019f0a	131	ret = clk_set_rate(arm_clk, new_freq * 1000);
1dd538f0 SG	132	if (ret) {
	133	dev_err(cpu_dev, "failed to set clock rate: %d\n", ret);
	134	regulator_set_voltage_tol(arm_reg, volt_old, 0);
d4019f0a	135	return ret;
1dd538f0 SG	136	}
	137
	138	/* scaling down? scale voltage after frequency */
d4019f0a	139	if (new_freq < old_freq) {
1dd538f0	140	ret = regulator_set_voltage_tol(arm_reg, volt, 0);
5a571c35	141	if (ret) {
1dd538f0 SG	142	dev_warn(cpu_dev,
1dd538f0 SG	143	"failed to scale vddarm down: %d\n", ret);
5a571c35 VK	144	ret = 0;
5a571c35 VK	145	}
b4573d1d AH	146	ret = regulator_set_voltage_tol(soc_reg, imx6_soc_volt[index], 0);
	147	if (ret) {
	148	dev_warn(cpu_dev, "failed to scale vddsoc down: %d\n", ret);
	149	ret = 0;
	150	}
22d0628a AH	151	if (!IS_ERR(pu_reg)) {
	152	ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0);
	153	if (ret) {
	154	dev_warn(cpu_dev, "failed to scale vddpu down: %d\n", ret);
	155	ret = 0;
	156	}
1dd538f0 SG	157	}
	158	}
	159
d4019f0a	160	return 0;
1dd538f0 SG	161	}
	162
	163	static int imx6q_cpufreq_init(struct cpufreq_policy *policy)
	164	{
652ed95d	165	policy->clk = arm_clk;
17922ddd	166	return cpufreq_generic_init(policy, freq_table, transition_latency);
1dd538f0 SG	167	}
1dd538f0 SG	168
1dd538f0	169	static struct cpufreq_driver imx6q_cpufreq_driver = {
ae6b4271	170	.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
4f6ba385	171	.verify = cpufreq_generic_frequency_table_verify,
9c0ebcf7	172	.target_index = imx6q_set_target,
652ed95d	173	.get = cpufreq_generic_get,
1dd538f0	174	.init = imx6q_cpufreq_init,
1dd538f0	175	.name = "imx6q-cpufreq",
4f6ba385	176	.attr = cpufreq_generic_attr,
1dd538f0 SG	177	};
	178
	179	static int imx6q_cpufreq_probe(struct platform_device *pdev)
	180	{
	181	struct device_node *np;
47d43ba7	182	struct dev_pm_opp *opp;
1dd538f0 SG	183	unsigned long min_volt, max_volt;
1dd538f0 SG	184	int num, ret;
b4573d1d AH	185	const struct property *prop;
	186	const __be32 *val;
	187	u32 nr, i, j;
1dd538f0	188
b494b48d SK	189	cpu_dev = get_cpu_device(0);
	190	if (!cpu_dev) {
	191	pr_err("failed to get cpu0 device\n");
	192	return -ENODEV;
	193	}
1dd538f0	194
cdc58d60	195	np = of_node_get(cpu_dev->of_node);
1dd538f0 SG	196	if (!np) {
	197	dev_err(cpu_dev, "failed to find cpu0 node\n");
	198	return -ENOENT;
	199	}
	200
f8269c19 PZ	201	arm_clk = clk_get(cpu_dev, "arm");
	202	pll1_sys_clk = clk_get(cpu_dev, "pll1_sys");
	203	pll1_sw_clk = clk_get(cpu_dev, "pll1_sw");
	204	step_clk = clk_get(cpu_dev, "step");
	205	pll2_pfd2_396m_clk = clk_get(cpu_dev, "pll2_pfd2_396m");
1dd538f0 SG	206	if (IS_ERR(arm_clk) \|\| IS_ERR(pll1_sys_clk) \|\| IS_ERR(pll1_sw_clk) \|\|
	207	IS_ERR(step_clk) \|\| IS_ERR(pll2_pfd2_396m_clk)) {
	208	dev_err(cpu_dev, "failed to get clocks\n");
	209	ret = -ENOENT;
f8269c19	210	goto put_clk;
1dd538f0 SG	211	}
1dd538f0 SG	212
a35fc5a3 BP	213	if (of_machine_is_compatible("fsl,imx6ul")) {
	214	pll2_bus_clk = clk_get(cpu_dev, "pll2_bus");
	215	secondary_sel_clk = clk_get(cpu_dev, "secondary_sel");
	216	if (IS_ERR(pll2_bus_clk) \|\| IS_ERR(secondary_sel_clk)) {
	217	dev_err(cpu_dev, "failed to get clocks specific to imx6ul\n");
	218	ret = -ENOENT;
	219	goto put_clk;
	220	}
	221	}
	222
f8269c19	223	arm_reg = regulator_get(cpu_dev, "arm");
22d0628a	224	pu_reg = regulator_get_optional(cpu_dev, "pu");
f8269c19	225	soc_reg = regulator_get(cpu_dev, "soc");
22d0628a	226	if (IS_ERR(arm_reg) \|\| IS_ERR(soc_reg)) {
1dd538f0 SG	227	dev_err(cpu_dev, "failed to get regulators\n");
1dd538f0 SG	228	ret = -ENOENT;
f8269c19	229	goto put_reg;
1dd538f0 SG	230	}
1dd538f0 SG	231
20b7cbe2 JT	232	/*
	233	* We expect an OPP table supplied by platform.
	234	* Just, incase the platform did not supply the OPP
	235	* table, it will try to get it.
	236	*/
5d4879cd	237	num = dev_pm_opp_get_opp_count(cpu_dev);
1dd538f0	238	if (num < 0) {
8f8d37b2	239	ret = dev_pm_opp_of_add_table(cpu_dev);
20b7cbe2 JT	240	if (ret < 0) {
20b7cbe2 JT	241	dev_err(cpu_dev, "failed to init OPP table: %d\n", ret);
f8269c19	242	goto put_reg;
20b7cbe2 JT	243	}
20b7cbe2 JT	244
cc87b8a8 VK	245	/* Because we have added the OPPs here, we must free them */
	246	free_opp = true;
	247
20b7cbe2 JT	248	num = dev_pm_opp_get_opp_count(cpu_dev);
	249	if (num < 0) {
	250	ret = num;
	251	dev_err(cpu_dev, "no OPP table is found: %d\n", ret);
cc87b8a8	252	goto out_free_opp;
20b7cbe2	253	}
1dd538f0 SG	254	}
1dd538f0 SG	255
5d4879cd	256	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
1dd538f0 SG	257	if (ret) {
1dd538f0 SG	258	dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
f8269c19	259	goto put_reg;
1dd538f0 SG	260	}
1dd538f0 SG	261
b4573d1d AH	262	/* Make imx6_soc_volt array's size same as arm opp number */
	263	imx6_soc_volt = devm_kzalloc(cpu_dev, sizeof(imx6_soc_volt) num, GFP_KERNEL);
	264	if (imx6_soc_volt == NULL) {
	265	ret = -ENOMEM;
	266	goto free_freq_table;
	267	}
	268
	269	prop = of_find_property(np, "fsl,soc-operating-points", NULL);
	270	if (!prop \|\| !prop->value)
	271	goto soc_opp_out;
	272
	273	/*
	274	* Each OPP is a set of tuples consisting of frequency and
	275	* voltage like <freq-kHz vol-uV>.
	276	*/
	277	nr = prop->length / sizeof(u32);
	278	if (nr % 2 \|\| (nr / 2) < num)
	279	goto soc_opp_out;
	280
	281	for (j = 0; j < num; j++) {
	282	val = prop->value;
	283	for (i = 0; i < nr / 2; i++) {
	284	unsigned long freq = be32_to_cpup(val++);
	285	unsigned long volt = be32_to_cpup(val++);
	286	if (freq_table[j].frequency == freq) {
	287	imx6_soc_volt[soc_opp_count++] = volt;
	288	break;
	289	}
	290	}
	291	}
	292
	293	soc_opp_out:
	294	/* use fixed soc opp volt if no valid soc opp info found in dtb */
	295	if (soc_opp_count != num) {
	296	dev_warn(cpu_dev, "can NOT find valid fsl,soc-operating-points property in dtb, use default value!\n");
	297	for (j = 0; j < num; j++)
	298	imx6_soc_volt[j] = PU_SOC_VOLTAGE_NORMAL;
	299	if (freq_table[num - 1].frequency * 1000 == FREQ_1P2_GHZ)
	300	imx6_soc_volt[num - 1] = PU_SOC_VOLTAGE_HIGH;
	301	}
	302
1dd538f0 SG	303	if (of_property_read_u32(np, "clock-latency", &transition_latency))
	304	transition_latency = CPUFREQ_ETERNAL;
	305
b4573d1d AH	306	/*
	307	* Calculate the ramp time for max voltage change in the
	308	* VDDSOC and VDDPU regulators.
	309	*/
	310	ret = regulator_set_voltage_time(soc_reg, imx6_soc_volt[0], imx6_soc_volt[num - 1]);
	311	if (ret > 0)
	312	transition_latency += ret * 1000;
22d0628a AH	313	if (!IS_ERR(pu_reg)) {
	314	ret = regulator_set_voltage_time(pu_reg, imx6_soc_volt[0], imx6_soc_volt[num - 1]);
	315	if (ret > 0)
	316	transition_latency += ret * 1000;
	317	}
b4573d1d	318
1dd538f0 SG	319	/*
	320	* OPP is maintained in order of increasing frequency, and
	321	* freq_table initialised from OPP is therefore sorted in the
	322	* same order.
	323	*/
	324	rcu_read_lock();
5d4879cd	325	opp = dev_pm_opp_find_freq_exact(cpu_dev,
1dd538f0	326	freq_table[0].frequency * 1000, true);
5d4879cd NM	327	min_volt = dev_pm_opp_get_voltage(opp);
5d4879cd NM	328	opp = dev_pm_opp_find_freq_exact(cpu_dev,
1dd538f0	329	freq_table[--num].frequency * 1000, true);
5d4879cd	330	max_volt = dev_pm_opp_get_voltage(opp);
1dd538f0 SG	331	rcu_read_unlock();
	332	ret = regulator_set_voltage_time(arm_reg, min_volt, max_volt);
	333	if (ret > 0)
	334	transition_latency += ret * 1000;
	335
1dd538f0 SG	336	ret = cpufreq_register_driver(&imx6q_cpufreq_driver);
	337	if (ret) {
	338	dev_err(cpu_dev, "failed register driver: %d\n", ret);
	339	goto free_freq_table;
	340	}
	341
	342	of_node_put(np);
	343	return 0;
	344
	345	free_freq_table:
5d4879cd	346	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
cc87b8a8 VK	347	out_free_opp:
cc87b8a8 VK	348	if (free_opp)
8f8d37b2	349	dev_pm_opp_of_remove_table(cpu_dev);
f8269c19 PZ	350	put_reg:
	351	if (!IS_ERR(arm_reg))
	352	regulator_put(arm_reg);
	353	if (!IS_ERR(pu_reg))
	354	regulator_put(pu_reg);
	355	if (!IS_ERR(soc_reg))
	356	regulator_put(soc_reg);
	357	put_clk:
	358	if (!IS_ERR(arm_clk))
	359	clk_put(arm_clk);
	360	if (!IS_ERR(pll1_sys_clk))
	361	clk_put(pll1_sys_clk);
	362	if (!IS_ERR(pll1_sw_clk))
	363	clk_put(pll1_sw_clk);
	364	if (!IS_ERR(step_clk))
	365	clk_put(step_clk);
	366	if (!IS_ERR(pll2_pfd2_396m_clk))
	367	clk_put(pll2_pfd2_396m_clk);
a35fc5a3 BP	368	if (!IS_ERR(pll2_bus_clk))
	369	clk_put(pll2_bus_clk);
	370	if (!IS_ERR(secondary_sel_clk))
	371	clk_put(secondary_sel_clk);
1dd538f0 SG	372	of_node_put(np);
	373	return ret;
	374	}
	375
	376	static int imx6q_cpufreq_remove(struct platform_device *pdev)
	377	{
	378	cpufreq_unregister_driver(&imx6q_cpufreq_driver);
5d4879cd	379	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
cc87b8a8	380	if (free_opp)
8f8d37b2	381	dev_pm_opp_of_remove_table(cpu_dev);
f8269c19	382	regulator_put(arm_reg);
22d0628a AH	383	if (!IS_ERR(pu_reg))
22d0628a AH	384	regulator_put(pu_reg);
f8269c19 PZ	385	regulator_put(soc_reg);
	386	clk_put(arm_clk);
	387	clk_put(pll1_sys_clk);
	388	clk_put(pll1_sw_clk);
	389	clk_put(step_clk);
	390	clk_put(pll2_pfd2_396m_clk);
a35fc5a3 BP	391	clk_put(pll2_bus_clk);
a35fc5a3 BP	392	clk_put(secondary_sel_clk);
1dd538f0 SG	393
	394	return 0;
	395	}
	396
	397	static struct platform_driver imx6q_cpufreq_platdrv = {
	398	.driver = {
	399	.name = "imx6q-cpufreq",
1dd538f0 SG	400	},
	401	.probe = imx6q_cpufreq_probe,
	402	.remove = imx6q_cpufreq_remove,
	403	};
	404	module_platform_driver(imx6q_cpufreq_platdrv);
	405
	406	MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>");
	407	MODULE_DESCRIPTION("Freescale i.MX6Q cpufreq driver");
	408	MODULE_LICENSE("GPL");