cpufreq: exynos: Add cpufreq driver for exynos5440

This patch adds dvfs support for exynos5440 SOC. This soc has 4 cores and
they scale at same frequency. The nature of exynos5440 clock controller is
different from previous exynos controllers so not using the common exynos
cpufreq framework. The major difference being interrupt notification for
frequency change. Also, OPP library is used for device tree parsing to get
different parameters like frequency, voltage etc. Since the opp library sorts
the frequency table in ascending order so they are again re-arranged in
descending order. This will have one-to-one mapping with the clock controller
state management logic.

Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

4 files changed, 516 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt
new file mode 100644
index 000000000000..caff1a57436f
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt
@@ -0,0 +1,28 @@
+
+Exynos5440 cpufreq driver
+-------------------
+
+Exynos5440 SoC cpufreq driver for CPU frequency scaling.
+
+Required properties:
+- interrupts: Interrupt to know the completion of cpu frequency change.
+- operating-points: Table of frequencies and voltage CPU could be transitioned into,
+        in the decreasing order. Frequency should be in KHz units and voltage
+        should be in microvolts.
+
+Optional properties:
+- clock-latency: Clock monitor latency in microsecond.
+
+All the required listed above must be defined under node cpufreq.
+
+Example:
+--------
+        cpufreq@160000 {
+                compatible = "samsung,exynos5440-cpufreq";
+                reg = <0x160000 0x1000>;
+                interrupts = <0 57 0>;
+                operating-points = <
+                                1000000 975000
+                                800000  925000>;
+                clock-latency = <100000>;
+        };
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 09da6a3f0e8f..83bd5c148d85 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -42,6 +42,15 @@ config ARM_EXYNOS5250_CPUFREQ
           This adds the CPUFreq driver for Samsung EXYNOS5250
           SoC.
 
+config ARM_EXYNOS5440_CPUFREQ
+        def_bool SOC_EXYNOS5440
+        depends on HAVE_CLK && PM_OPP && OF
+        help
+          This adds the CPUFreq driver for Samsung EXYNOS5440
+          SoC. The nature of exynos5440 clock controller is
+          different than previous exynos controllers so not using
+          the common exynos framework.
+
 config ARM_HIGHBANK_CPUFREQ
         tristate "Calxeda Highbank-based"
         depends on ARCH_HIGHBANK
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index a264dd302c34..315b9231feb1 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_ARM_EXYNOS_CPUFREQ)	+= exynos-cpufreq.o
 obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ)    += exynos4210-cpufreq.o
 obj-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ)    += exynos4x12-cpufreq.o
 obj-$(CONFIG_ARM_EXYNOS5250_CPUFREQ)    += exynos5250-cpufreq.o
+obj-$(CONFIG_ARM_EXYNOS5440_CPUFREQ)    += exynos5440-cpufreq.o
 obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ)      += highbank-cpufreq.o
 obj-$(CONFIG_ARM_IMX6Q_CPUFREQ)         += imx6q-cpufreq.o
 obj-$(CONFIG_ARM_INTEGRATOR)            += integrator-cpufreq.o
diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
new file mode 100644
index 000000000000..ead7ed43e238
--- /dev/null
+++ b/drivers/cpufreq/exynos5440-cpufreq.c
@@ -0,0 +1,478 @@
+/*
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * Amit Daniel Kachhap <amit.daniel@samsung.com>
+ *
+ * EXYNOS5440 - CPU frequency scaling support
+ *
+ * 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/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/opp.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* Register definitions */
+#define XMU_DVFS_CTRL           0x0060
+#define XMU_PMU_P0_7            0x0064
+#define XMU_C0_3_PSTATE         0x0090
+#define XMU_P_LIMIT             0x00a0
+#define XMU_P_STATUS            0x00a4
+#define XMU_PMUEVTEN            0x00d0
+#define XMU_PMUIRQEN            0x00d4
+#define XMU_PMUIRQ              0x00d8
+
+/* PMU mask and shift definations */
+#define P_VALUE_MASK            0x7
+
+#define XMU_DVFS_CTRL_EN_SHIFT  0
+
+#define P0_7_CPUCLKDEV_SHIFT    21
+#define P0_7_CPUCLKDEV_MASK     0x7
+#define P0_7_ATBCLKDEV_SHIFT    18
+#define P0_7_ATBCLKDEV_MASK     0x7
+#define P0_7_CSCLKDEV_SHIFT     15
+#define P0_7_CSCLKDEV_MASK      0x7
+#define P0_7_CPUEMA_SHIFT       28
+#define P0_7_CPUEMA_MASK        0xf
+#define P0_7_L2EMA_SHIFT        24
+#define P0_7_L2EMA_MASK         0xf
+#define P0_7_VDD_SHIFT          8
+#define P0_7_VDD_MASK           0x7f
+#define P0_7_FREQ_SHIFT         0
+#define P0_7_FREQ_MASK          0xff
+
+#define C0_3_PSTATE_VALID_SHIFT 8
+#define C0_3_PSTATE_CURR_SHIFT  4
+#define C0_3_PSTATE_NEW_SHIFT   0
+
+#define PSTATE_CHANGED_EVTEN_SHIFT      0
+
+#define PSTATE_CHANGED_IRQEN_SHIFT      0
+
+#define PSTATE_CHANGED_SHIFT            0
+
+/* some constant values for clock divider calculation */
+#define CPU_DIV_FREQ_MAX        500
+#define CPU_DBG_FREQ_MAX        375
+#define CPU_ATB_FREQ_MAX        500
+
+#define PMIC_LOW_VOLT           0x30
+#define PMIC_HIGH_VOLT          0x28
+
+#define CPUEMA_HIGH             0x2
+#define CPUEMA_MID              0x4
+#define CPUEMA_LOW              0x7
+
+#define L2EMA_HIGH              0x1
+#define L2EMA_MID               0x3
+#define L2EMA_LOW               0x4
+
+#define DIV_TAB_MAX     2
+/* frequency unit is 20MHZ */
+#define FREQ_UNIT       20
+#define MAX_VOLTAGE     1550000 /* In microvolt */
+#define VOLTAGE_STEP    12500   /* In microvolt */
+
+#define CPUFREQ_NAME            "exynos5440_dvfs"
+#define DEF_TRANS_LATENCY       100000
+
+enum cpufreq_level_index {
+        L0, L1, L2, L3, L4,
+        L5, L6, L7, L8, L9,
+};
+#define CPUFREQ_LEVEL_END       (L7 + 1)
+
+struct exynos_dvfs_data {
+        void __iomem *base;
+        struct resource *mem;
+        int irq;
+        struct clk *cpu_clk;
+        unsigned int cur_frequency;
+        unsigned int latency;
+        struct cpufreq_frequency_table *freq_table;
+        unsigned int freq_count;
+        struct device *dev;
+        bool dvfs_enabled;
+        struct work_struct irq_work;
+};
+
+static struct exynos_dvfs_data *dvfs_info;
+static DEFINE_MUTEX(cpufreq_lock);
+static struct cpufreq_freqs freqs;
+
+static int init_div_table(void)
+{
+        struct cpufreq_frequency_table *freq_tbl = dvfs_info->freq_table;
+        unsigned int tmp, clk_div, ema_div, freq, volt_id;
+        int i = 0;
+        struct opp *opp;
+
+        for (i = 0; freq_tbl[i].frequency != CPUFREQ_TABLE_END; i++) {
+
+                opp = opp_find_freq_exact(dvfs_info->dev,
+                                        freq_tbl[i].frequency * 1000, true);
+                if (IS_ERR(opp)) {
+                        dev_err(dvfs_info->dev,
+                                "failed to find valid OPP for %u KHZ\n",
+                                freq_tbl[i].frequency);
+                        return PTR_ERR(opp);
+                }
+
+                freq = freq_tbl[i].frequency / 1000; /* In MHZ */
+                clk_div = ((freq / CPU_DIV_FREQ_MAX) & P0_7_CPUCLKDEV_MASK)
+                                        << P0_7_CPUCLKDEV_SHIFT;
+                clk_div |= ((freq / CPU_ATB_FREQ_MAX) & P0_7_ATBCLKDEV_MASK)
+                                        << P0_7_ATBCLKDEV_SHIFT;
+                clk_div |= ((freq / CPU_DBG_FREQ_MAX) & P0_7_CSCLKDEV_MASK)
+                                        << P0_7_CSCLKDEV_SHIFT;
+
+                /* Calculate EMA */
+                volt_id = opp_get_voltage(opp);
+                volt_id = (MAX_VOLTAGE - volt_id) / VOLTAGE_STEP;
+                if (volt_id < PMIC_HIGH_VOLT) {
+                        ema_div = (CPUEMA_HIGH << P0_7_CPUEMA_SHIFT) |
+                                (L2EMA_HIGH << P0_7_L2EMA_SHIFT);
+                } else if (volt_id > PMIC_LOW_VOLT) {
+                        ema_div = (CPUEMA_LOW << P0_7_CPUEMA_SHIFT) |
+                                (L2EMA_LOW << P0_7_L2EMA_SHIFT);
+                } else {
+                        ema_div = (CPUEMA_MID << P0_7_CPUEMA_SHIFT) |
+                                (L2EMA_MID << P0_7_L2EMA_SHIFT);
+                }
+
+                tmp = (clk_div | ema_div | (volt_id << P0_7_VDD_SHIFT)
+                        | ((freq / FREQ_UNIT) << P0_7_FREQ_SHIFT));
+
+                __raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 * i);
+        }
+
+        return 0;
+}
+
+static void exynos_enable_dvfs(void)
+{
+        unsigned int tmp, i, cpu;
+        struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
+        /* Disable DVFS */
+        __raw_writel(0, dvfs_info->base + XMU_DVFS_CTRL);
+
+        /* Enable PSTATE Change Event */
+        tmp = __raw_readl(dvfs_info->base + XMU_PMUEVTEN);
+        tmp |= (1 << PSTATE_CHANGED_EVTEN_SHIFT);
+         __raw_writel(tmp, dvfs_info->base + XMU_PMUEVTEN);
+
+        /* Enable PSTATE Change IRQ */
+        tmp = __raw_readl(dvfs_info->base + XMU_PMUIRQEN);
+        tmp |= (1 << PSTATE_CHANGED_IRQEN_SHIFT);
+         __raw_writel(tmp, dvfs_info->base + XMU_PMUIRQEN);
+
+        /* Set initial performance index */
+        for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++)
+                if (freq_table[i].frequency == dvfs_info->cur_frequency)
+                        break;
+
+        if (freq_table[i].frequency == CPUFREQ_TABLE_END) {
+                dev_crit(dvfs_info->dev, "Boot up frequency not supported\n");
+                /* Assign the highest frequency */
+                i = 0;
+                dvfs_info->cur_frequency = freq_table[i].frequency;
+        }
+
+        dev_info(dvfs_info->dev, "Setting dvfs initial frequency = %uKHZ",
+                                                dvfs_info->cur_frequency);
+
+        for (cpu = 0; cpu < CONFIG_NR_CPUS; cpu++) {
+                tmp = __raw_readl(dvfs_info->base + XMU_C0_3_PSTATE + cpu * 4);
+                tmp &= ~(P_VALUE_MASK << C0_3_PSTATE_NEW_SHIFT);
+                tmp |= (i << C0_3_PSTATE_NEW_SHIFT);
+                __raw_writel(tmp, dvfs_info->base + XMU_C0_3_PSTATE + cpu * 4);
+        }
+
+        /* Enable DVFS */
+        __raw_writel(1 << XMU_DVFS_CTRL_EN_SHIFT,
+                                dvfs_info->base + XMU_DVFS_CTRL);
+}
+
+static int exynos_verify_speed(struct cpufreq_policy *policy)
+{
+        return cpufreq_frequency_table_verify(policy,
+                                              dvfs_info->freq_table);
+}
+
+static unsigned int exynos_getspeed(unsigned int cpu)
+{
+        return dvfs_info->cur_frequency;
+}
+
+static int exynos_target(struct cpufreq_policy *policy,
+                          unsigned int target_freq,
+                          unsigned int relation)
+{
+        unsigned int index, tmp;
+        int ret = 0, i;
+        struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
+
+        mutex_lock(&cpufreq_lock);
+
+        ret = cpufreq_frequency_table_target(policy, freq_table,
+                                           target_freq, relation, &index);
+        if (ret)
+                goto out;
+
+        freqs.old = dvfs_info->cur_frequency;
+        freqs.new = freq_table[index].frequency;
+
+        cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
+        /* Set the target frequency in all C0_3_PSTATE register */
+        for_each_cpu(i, policy->cpus) {
+                tmp = __raw_readl(dvfs_info->base + XMU_C0_3_PSTATE + i * 4);
+                tmp &= ~(P_VALUE_MASK << C0_3_PSTATE_NEW_SHIFT);
+                tmp |= (index << C0_3_PSTATE_NEW_SHIFT);
+
+                __raw_writel(tmp, dvfs_info->base + XMU_C0_3_PSTATE + i * 4);
+        }
+out:
+        mutex_unlock(&cpufreq_lock);
+        return ret;
+}
+
+static void exynos_cpufreq_work(struct work_struct *work)
+{
+        unsigned int cur_pstate, index;
+        struct cpufreq_policy *policy = cpufreq_cpu_get(0); /* boot CPU */
+        struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
+
+        /* Ensure we can access cpufreq structures */
+        if (unlikely(dvfs_info->dvfs_enabled == false))
+                goto skip_work;
+
+        mutex_lock(&cpufreq_lock);
+        freqs.old = dvfs_info->cur_frequency;
+
+        cur_pstate = __raw_readl(dvfs_info->base + XMU_P_STATUS);
+        if (cur_pstate >> C0_3_PSTATE_VALID_SHIFT & 0x1)
+                index = (cur_pstate >> C0_3_PSTATE_CURR_SHIFT) & P_VALUE_MASK;
+        else
+                index = (cur_pstate >> C0_3_PSTATE_NEW_SHIFT) & P_VALUE_MASK;
+
+        if (likely(index < dvfs_info->freq_count)) {
+                freqs.new = freq_table[index].frequency;
+                dvfs_info->cur_frequency = freqs.new;
+        } else {
+                dev_crit(dvfs_info->dev, "New frequency out of range\n");
+                freqs.new = dvfs_info->cur_frequency;
+        }
+        cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
+
+        cpufreq_cpu_put(policy);
+        mutex_unlock(&cpufreq_lock);
+skip_work:
+        enable_irq(dvfs_info->irq);
+}
+
+static irqreturn_t exynos_cpufreq_irq(int irq, void *id)
+{
+        unsigned int tmp;
+
+        tmp = __raw_readl(dvfs_info->base + XMU_PMUIRQ);
+        if (tmp >> PSTATE_CHANGED_SHIFT & 0x1) {
+                __raw_writel(tmp, dvfs_info->base + XMU_PMUIRQ);
+                disable_irq_nosync(irq);
+                schedule_work(&dvfs_info->irq_work);
+        }
+        return IRQ_HANDLED;
+}
+
+static void exynos_sort_descend_freq_table(void)
+{
+        struct cpufreq_frequency_table *freq_tbl = dvfs_info->freq_table;
+        int i = 0, index;
+        unsigned int tmp_freq;
+        /*
+         * Exynos5440 clock controller state logic expects the cpufreq table to
+         * be in descending order. But the OPP library constructs the table in
+         * ascending order. So to make the table descending we just need to
+         * swap the i element with the N - i element.
+         */
+        for (i = 0; i < dvfs_info->freq_count / 2; i++) {
+                index = dvfs_info->freq_count - i - 1;
+                tmp_freq = freq_tbl[i].frequency;
+                freq_tbl[i].frequency = freq_tbl[index].frequency;
+                freq_tbl[index].frequency = tmp_freq;
+        }
+}
+
+static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+        int ret;
+
+        ret = cpufreq_frequency_table_cpuinfo(policy, dvfs_info->freq_table);
+        if (ret) {
+                dev_err(dvfs_info->dev, "Invalid frequency table: %d\n", ret);
+                return ret;
+        }
+
+        policy->cur = dvfs_info->cur_frequency;
+        policy->cpuinfo.transition_latency = dvfs_info->latency;
+        cpumask_setall(policy->cpus);
+
+        cpufreq_frequency_table_get_attr(dvfs_info->freq_table, policy->cpu);
+
+        return 0;
+}
+
+static struct cpufreq_driver exynos_driver = {
+        .flags          = CPUFREQ_STICKY,
+        .verify         = exynos_verify_speed,
+        .target         = exynos_target,
+        .get            = exynos_getspeed,
+        .init           = exynos_cpufreq_cpu_init,
+        .name           = CPUFREQ_NAME,
+};
+
+static const struct of_device_id exynos_cpufreq_match[] = {
+        {
+                .compatible = "samsung,exynos5440-cpufreq",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, exynos_cpufreq_match);
+
+static int exynos_cpufreq_probe(struct platform_device *pdev)
+{
+        int ret = -EINVAL;
+        struct device_node *np;
+        struct resource res;
+
+        np =  pdev->dev.of_node;
+        if (!np)
+                return -ENODEV;
+
+        dvfs_info = devm_kzalloc(&pdev->dev, sizeof(*dvfs_info), GFP_KERNEL);
+        if (!dvfs_info) {
+                ret = -ENOMEM;
+                goto err_put_node;
+        }
+
+        dvfs_info->dev = &pdev->dev;
+
+        ret = of_address_to_resource(np, 0, &res);
+        if (ret)
+                goto err_put_node;
+
+        dvfs_info->base = devm_ioremap_resource(dvfs_info->dev, &res);
+        if (IS_ERR(dvfs_info->base)) {
+                ret = PTR_ERR(dvfs_info->base);
+                goto err_put_node;
+        }
+
+        dvfs_info->irq = irq_of_parse_and_map(np, 0);
+        if (!dvfs_info->irq) {
+                dev_err(dvfs_info->dev, "No cpufreq irq found\n");
+                ret = -ENODEV;
+                goto err_put_node;
+        }
+
+        ret = of_init_opp_table(dvfs_info->dev);
+        if (ret) {
+                dev_err(dvfs_info->dev, "failed to init OPP table: %d\n", ret);
+                goto err_put_node;
+        }
+
+        ret = opp_init_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
+        if (ret) {
+                dev_err(dvfs_info->dev,
+                        "failed to init cpufreq table: %d\n", ret);
+                goto err_put_node;
+        }
+        dvfs_info->freq_count = opp_get_opp_count(dvfs_info->dev);
+        exynos_sort_descend_freq_table();
+
+        if (of_property_read_u32(np, "clock-latency", &dvfs_info->latency))
+                dvfs_info->latency = DEF_TRANS_LATENCY;
+
+        dvfs_info->cpu_clk = devm_clk_get(dvfs_info->dev, "armclk");
+        if (IS_ERR(dvfs_info->cpu_clk)) {
+                dev_err(dvfs_info->dev, "Failed to get cpu clock\n");
+                ret = PTR_ERR(dvfs_info->cpu_clk);
+                goto err_free_table;
+        }
+
+        dvfs_info->cur_frequency = clk_get_rate(dvfs_info->cpu_clk);
+        if (!dvfs_info->cur_frequency) {
+                dev_err(dvfs_info->dev, "Failed to get clock rate\n");
+                ret = -EINVAL;
+                goto err_free_table;
+        }
+        dvfs_info->cur_frequency /= 1000;
+
+        INIT_WORK(&dvfs_info->irq_work, exynos_cpufreq_work);
+        ret = devm_request_irq(dvfs_info->dev, dvfs_info->irq,
+                                exynos_cpufreq_irq, IRQF_TRIGGER_NONE,
+                                CPUFREQ_NAME, dvfs_info);
+        if (ret) {
+                dev_err(dvfs_info->dev, "Failed to register IRQ\n");
+                goto err_free_table;
+        }
+
+        ret = init_div_table();
+        if (ret) {
+                dev_err(dvfs_info->dev, "Failed to initialise div table\n");
+                goto err_free_table;
+        }
+
+        exynos_enable_dvfs();
+        ret = cpufreq_register_driver(&exynos_driver);
+        if (ret) {
+                dev_err(dvfs_info->dev,
+                        "%s: failed to register cpufreq driver\n", __func__);
+                goto err_free_table;
+        }
+
+        of_node_put(np);
+        dvfs_info->dvfs_enabled = true;
+        return 0;
+
+err_free_table:
+        opp_free_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
+err_put_node:
+        of_node_put(np);
+        dev_err(dvfs_info->dev, "%s: failed initialization\n", __func__);
+        return ret;
+}
+
+static int exynos_cpufreq_remove(struct platform_device *pdev)
+{
+        cpufreq_unregister_driver(&exynos_driver);
+        opp_free_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
+        return 0;
+}
+
+static struct platform_driver exynos_cpufreq_platdrv = {
+        .driver = {
+                .name   = "exynos5440-cpufreq",
+                .owner  = THIS_MODULE,
+                .of_match_table = exynos_cpufreq_match,
+        },
+        .probe          = exynos_cpufreq_probe,
+        .remove         = exynos_cpufreq_remove,
+};
+module_platform_driver(exynos_cpufreq_platdrv);
+
+MODULE_AUTHOR("Amit Daniel Kachhap <amit.daniel@samsung.com>");
+MODULE_DESCRIPTION("Exynos5440 cpufreq driver");
+MODULE_LICENSE("GPL");