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path: root/drivers/cpufreq/qcom-cpufreq-hw.c
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-rw-r--r--drivers/cpufreq/qcom-cpufreq-hw.c733
1 files changed, 733 insertions, 0 deletions
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
new file mode 100644
index 000000000..749b60c78
--- /dev/null
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -0,0 +1,733 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/cpufreq.h>
+#include <linux/init.h>
+#include <linux/interconnect.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/pm_opp.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/units.h>
+
+#define LUT_MAX_ENTRIES 40U
+#define LUT_SRC GENMASK(31, 30)
+#define LUT_L_VAL GENMASK(7, 0)
+#define LUT_CORE_COUNT GENMASK(18, 16)
+#define LUT_VOLT GENMASK(11, 0)
+#define CLK_HW_DIV 2
+#define LUT_TURBO_IND 1
+
+#define GT_IRQ_STATUS BIT(2)
+
+struct qcom_cpufreq_soc_data {
+ u32 reg_enable;
+ u32 reg_domain_state;
+ u32 reg_dcvs_ctrl;
+ u32 reg_freq_lut;
+ u32 reg_volt_lut;
+ u32 reg_intr_clr;
+ u32 reg_current_vote;
+ u32 reg_perf_state;
+ u8 lut_row_size;
+};
+
+struct qcom_cpufreq_data {
+ void __iomem *base;
+ struct resource *res;
+ const struct qcom_cpufreq_soc_data *soc_data;
+
+ /*
+ * Mutex to synchronize between de-init sequence and re-starting LMh
+ * polling/interrupts
+ */
+ struct mutex throttle_lock;
+ int throttle_irq;
+ char irq_name[15];
+ bool cancel_throttle;
+ struct delayed_work throttle_work;
+ struct cpufreq_policy *policy;
+
+ bool per_core_dcvs;
+};
+
+static unsigned long cpu_hw_rate, xo_rate;
+static bool icc_scaling_enabled;
+
+static int qcom_cpufreq_set_bw(struct cpufreq_policy *policy,
+ unsigned long freq_khz)
+{
+ unsigned long freq_hz = freq_khz * 1000;
+ struct dev_pm_opp *opp;
+ struct device *dev;
+ int ret;
+
+ dev = get_cpu_device(policy->cpu);
+ if (!dev)
+ return -ENODEV;
+
+ opp = dev_pm_opp_find_freq_exact(dev, freq_hz, true);
+ if (IS_ERR(opp))
+ return PTR_ERR(opp);
+
+ ret = dev_pm_opp_set_opp(dev, opp);
+ dev_pm_opp_put(opp);
+ return ret;
+}
+
+static int qcom_cpufreq_update_opp(struct device *cpu_dev,
+ unsigned long freq_khz,
+ unsigned long volt)
+{
+ unsigned long freq_hz = freq_khz * 1000;
+ int ret;
+
+ /* Skip voltage update if the opp table is not available */
+ if (!icc_scaling_enabled)
+ return dev_pm_opp_add(cpu_dev, freq_hz, volt);
+
+ ret = dev_pm_opp_adjust_voltage(cpu_dev, freq_hz, volt, volt, volt);
+ if (ret) {
+ dev_err(cpu_dev, "Voltage update failed freq=%ld\n", freq_khz);
+ return ret;
+ }
+
+ return dev_pm_opp_enable(cpu_dev, freq_hz);
+}
+
+static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy,
+ unsigned int index)
+{
+ struct qcom_cpufreq_data *data = policy->driver_data;
+ const struct qcom_cpufreq_soc_data *soc_data = data->soc_data;
+ unsigned long freq = policy->freq_table[index].frequency;
+ unsigned int i;
+
+ writel_relaxed(index, data->base + soc_data->reg_perf_state);
+
+ if (data->per_core_dcvs)
+ for (i = 1; i < cpumask_weight(policy->related_cpus); i++)
+ writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4);
+
+ if (icc_scaling_enabled)
+ qcom_cpufreq_set_bw(policy, freq);
+
+ return 0;
+}
+
+static unsigned long qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data)
+{
+ unsigned int lval;
+
+ if (data->soc_data->reg_current_vote)
+ lval = readl_relaxed(data->base + data->soc_data->reg_current_vote) & 0x3ff;
+ else
+ lval = readl_relaxed(data->base + data->soc_data->reg_domain_state) & 0xff;
+
+ return lval * xo_rate;
+}
+
+/* Get the frequency requested by the cpufreq core for the CPU */
+static unsigned int qcom_cpufreq_get_freq(unsigned int cpu)
+{
+ struct qcom_cpufreq_data *data;
+ const struct qcom_cpufreq_soc_data *soc_data;
+ struct cpufreq_policy *policy;
+ unsigned int index;
+
+ policy = cpufreq_cpu_get_raw(cpu);
+ if (!policy)
+ return 0;
+
+ data = policy->driver_data;
+ soc_data = data->soc_data;
+
+ index = readl_relaxed(data->base + soc_data->reg_perf_state);
+ index = min(index, LUT_MAX_ENTRIES - 1);
+
+ return policy->freq_table[index].frequency;
+}
+
+static unsigned int qcom_cpufreq_hw_get(unsigned int cpu)
+{
+ struct qcom_cpufreq_data *data;
+ struct cpufreq_policy *policy;
+
+ policy = cpufreq_cpu_get_raw(cpu);
+ if (!policy)
+ return 0;
+
+ data = policy->driver_data;
+
+ if (data->throttle_irq >= 0)
+ return qcom_lmh_get_throttle_freq(data) / HZ_PER_KHZ;
+
+ return qcom_cpufreq_get_freq(cpu);
+}
+
+static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
+ unsigned int target_freq)
+{
+ struct qcom_cpufreq_data *data = policy->driver_data;
+ const struct qcom_cpufreq_soc_data *soc_data = data->soc_data;
+ unsigned int index;
+ unsigned int i;
+
+ index = policy->cached_resolved_idx;
+ writel_relaxed(index, data->base + soc_data->reg_perf_state);
+
+ if (data->per_core_dcvs)
+ for (i = 1; i < cpumask_weight(policy->related_cpus); i++)
+ writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4);
+
+ return policy->freq_table[index].frequency;
+}
+
+static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
+ struct cpufreq_policy *policy)
+{
+ u32 data, src, lval, i, core_count, prev_freq = 0, freq;
+ u32 volt;
+ struct cpufreq_frequency_table *table;
+ struct dev_pm_opp *opp;
+ unsigned long rate;
+ int ret;
+ struct qcom_cpufreq_data *drv_data = policy->driver_data;
+ const struct qcom_cpufreq_soc_data *soc_data = drv_data->soc_data;
+
+ table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL);
+ if (!table)
+ return -ENOMEM;
+
+ ret = dev_pm_opp_of_add_table(cpu_dev);
+ if (!ret) {
+ /* Disable all opps and cross-validate against LUT later */
+ icc_scaling_enabled = true;
+ for (rate = 0; ; rate++) {
+ opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
+ if (IS_ERR(opp))
+ break;
+
+ dev_pm_opp_put(opp);
+ dev_pm_opp_disable(cpu_dev, rate);
+ }
+ } else if (ret != -ENODEV) {
+ dev_err(cpu_dev, "Invalid opp table in device tree\n");
+ kfree(table);
+ return ret;
+ } else {
+ policy->fast_switch_possible = true;
+ icc_scaling_enabled = false;
+ }
+
+ for (i = 0; i < LUT_MAX_ENTRIES; i++) {
+ data = readl_relaxed(drv_data->base + soc_data->reg_freq_lut +
+ i * soc_data->lut_row_size);
+ src = FIELD_GET(LUT_SRC, data);
+ lval = FIELD_GET(LUT_L_VAL, data);
+ core_count = FIELD_GET(LUT_CORE_COUNT, data);
+
+ data = readl_relaxed(drv_data->base + soc_data->reg_volt_lut +
+ i * soc_data->lut_row_size);
+ volt = FIELD_GET(LUT_VOLT, data) * 1000;
+
+ if (src)
+ freq = xo_rate * lval / 1000;
+ else
+ freq = cpu_hw_rate / 1000;
+
+ if (freq != prev_freq && core_count != LUT_TURBO_IND) {
+ if (!qcom_cpufreq_update_opp(cpu_dev, freq, volt)) {
+ table[i].frequency = freq;
+ dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i,
+ freq, core_count);
+ } else {
+ dev_warn(cpu_dev, "failed to update OPP for freq=%d\n", freq);
+ table[i].frequency = CPUFREQ_ENTRY_INVALID;
+ }
+
+ } else if (core_count == LUT_TURBO_IND) {
+ table[i].frequency = CPUFREQ_ENTRY_INVALID;
+ }
+
+ /*
+ * Two of the same frequencies with the same core counts means
+ * end of table
+ */
+ if (i > 0 && prev_freq == freq) {
+ struct cpufreq_frequency_table *prev = &table[i - 1];
+
+ /*
+ * Only treat the last frequency that might be a boost
+ * as the boost frequency
+ */
+ if (prev->frequency == CPUFREQ_ENTRY_INVALID) {
+ if (!qcom_cpufreq_update_opp(cpu_dev, prev_freq, volt)) {
+ prev->frequency = prev_freq;
+ prev->flags = CPUFREQ_BOOST_FREQ;
+ } else {
+ dev_warn(cpu_dev, "failed to update OPP for freq=%d\n",
+ freq);
+ }
+ }
+
+ break;
+ }
+
+ prev_freq = freq;
+ }
+
+ table[i].frequency = CPUFREQ_TABLE_END;
+ policy->freq_table = table;
+ dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
+
+ return 0;
+}
+
+static void qcom_get_related_cpus(int index, struct cpumask *m)
+{
+ struct device_node *cpu_np;
+ struct of_phandle_args args;
+ int cpu, ret;
+
+ for_each_possible_cpu(cpu) {
+ cpu_np = of_cpu_device_node_get(cpu);
+ if (!cpu_np)
+ continue;
+
+ ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
+ "#freq-domain-cells", 0,
+ &args);
+ of_node_put(cpu_np);
+ if (ret < 0)
+ continue;
+
+ if (index == args.args[0])
+ cpumask_set_cpu(cpu, m);
+ }
+}
+
+static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
+{
+ struct cpufreq_policy *policy = data->policy;
+ int cpu = cpumask_first(policy->related_cpus);
+ struct device *dev = get_cpu_device(cpu);
+ unsigned long freq_hz, throttled_freq;
+ struct dev_pm_opp *opp;
+
+ /*
+ * Get the h/w throttled frequency, normalize it using the
+ * registered opp table and use it to calculate thermal pressure.
+ */
+ freq_hz = qcom_lmh_get_throttle_freq(data);
+
+ opp = dev_pm_opp_find_freq_floor(dev, &freq_hz);
+ if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE)
+ opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz);
+
+ if (IS_ERR(opp)) {
+ dev_warn(dev, "Can't find the OPP for throttling: %pe!\n", opp);
+ } else {
+ dev_pm_opp_put(opp);
+ }
+
+ throttled_freq = freq_hz / HZ_PER_KHZ;
+
+ /* Update thermal pressure (the boost frequencies are accepted) */
+ arch_update_thermal_pressure(policy->related_cpus, throttled_freq);
+
+ /*
+ * In the unlikely case policy is unregistered do not enable
+ * polling or h/w interrupt
+ */
+ mutex_lock(&data->throttle_lock);
+ if (data->cancel_throttle)
+ goto out;
+
+ /*
+ * If h/w throttled frequency is higher than what cpufreq has requested
+ * for, then stop polling and switch back to interrupt mechanism.
+ */
+ if (throttled_freq >= qcom_cpufreq_get_freq(cpu))
+ enable_irq(data->throttle_irq);
+ else
+ mod_delayed_work(system_highpri_wq, &data->throttle_work,
+ msecs_to_jiffies(10));
+
+out:
+ mutex_unlock(&data->throttle_lock);
+}
+
+static void qcom_lmh_dcvs_poll(struct work_struct *work)
+{
+ struct qcom_cpufreq_data *data;
+
+ data = container_of(work, struct qcom_cpufreq_data, throttle_work.work);
+ qcom_lmh_dcvs_notify(data);
+}
+
+static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data)
+{
+ struct qcom_cpufreq_data *c_data = data;
+
+ /* Disable interrupt and enable polling */
+ disable_irq_nosync(c_data->throttle_irq);
+ schedule_delayed_work(&c_data->throttle_work, 0);
+
+ if (c_data->soc_data->reg_intr_clr)
+ writel_relaxed(GT_IRQ_STATUS,
+ c_data->base + c_data->soc_data->reg_intr_clr);
+
+ return IRQ_HANDLED;
+}
+
+static const struct qcom_cpufreq_soc_data qcom_soc_data = {
+ .reg_enable = 0x0,
+ .reg_dcvs_ctrl = 0xbc,
+ .reg_freq_lut = 0x110,
+ .reg_volt_lut = 0x114,
+ .reg_current_vote = 0x704,
+ .reg_perf_state = 0x920,
+ .lut_row_size = 32,
+};
+
+static const struct qcom_cpufreq_soc_data epss_soc_data = {
+ .reg_enable = 0x0,
+ .reg_domain_state = 0x20,
+ .reg_dcvs_ctrl = 0xb0,
+ .reg_freq_lut = 0x100,
+ .reg_volt_lut = 0x200,
+ .reg_intr_clr = 0x308,
+ .reg_perf_state = 0x320,
+ .lut_row_size = 4,
+};
+
+static const struct of_device_id qcom_cpufreq_hw_match[] = {
+ { .compatible = "qcom,cpufreq-hw", .data = &qcom_soc_data },
+ { .compatible = "qcom,cpufreq-epss", .data = &epss_soc_data },
+ {}
+};
+MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match);
+
+static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index)
+{
+ struct qcom_cpufreq_data *data = policy->driver_data;
+ struct platform_device *pdev = cpufreq_get_driver_data();
+ int ret;
+
+ /*
+ * Look for LMh interrupt. If no interrupt line is specified /
+ * if there is an error, allow cpufreq to be enabled as usual.
+ */
+ data->throttle_irq = platform_get_irq_optional(pdev, index);
+ if (data->throttle_irq == -ENXIO)
+ return 0;
+ if (data->throttle_irq < 0)
+ return data->throttle_irq;
+
+ data->cancel_throttle = false;
+ data->policy = policy;
+
+ mutex_init(&data->throttle_lock);
+ INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll);
+
+ snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu);
+ ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq,
+ IRQF_ONESHOT | IRQF_NO_AUTOEN, data->irq_name, data);
+ if (ret) {
+ dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret);
+ return 0;
+ }
+
+ ret = irq_set_affinity_and_hint(data->throttle_irq, policy->cpus);
+ if (ret)
+ dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n",
+ data->irq_name, data->throttle_irq);
+
+ return 0;
+}
+
+static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy)
+{
+ struct qcom_cpufreq_data *data = policy->driver_data;
+ struct platform_device *pdev = cpufreq_get_driver_data();
+ int ret;
+
+ if (data->throttle_irq <= 0)
+ return 0;
+
+ mutex_lock(&data->throttle_lock);
+ data->cancel_throttle = false;
+ mutex_unlock(&data->throttle_lock);
+
+ ret = irq_set_affinity_and_hint(data->throttle_irq, policy->cpus);
+ if (ret)
+ dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n",
+ data->irq_name, data->throttle_irq);
+
+ return ret;
+}
+
+static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy)
+{
+ struct qcom_cpufreq_data *data = policy->driver_data;
+
+ if (data->throttle_irq <= 0)
+ return 0;
+
+ mutex_lock(&data->throttle_lock);
+ data->cancel_throttle = true;
+ mutex_unlock(&data->throttle_lock);
+
+ cancel_delayed_work_sync(&data->throttle_work);
+ irq_set_affinity_and_hint(data->throttle_irq, NULL);
+ disable_irq_nosync(data->throttle_irq);
+
+ return 0;
+}
+
+static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data)
+{
+ if (data->throttle_irq <= 0)
+ return;
+
+ free_irq(data->throttle_irq, data);
+}
+
+static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
+{
+ struct platform_device *pdev = cpufreq_get_driver_data();
+ struct device *dev = &pdev->dev;
+ struct of_phandle_args args;
+ struct device_node *cpu_np;
+ struct device *cpu_dev;
+ struct resource *res;
+ void __iomem *base;
+ struct qcom_cpufreq_data *data;
+ int ret, index;
+
+ cpu_dev = get_cpu_device(policy->cpu);
+ if (!cpu_dev) {
+ pr_err("%s: failed to get cpu%d device\n", __func__,
+ policy->cpu);
+ return -ENODEV;
+ }
+
+ cpu_np = of_cpu_device_node_get(policy->cpu);
+ if (!cpu_np)
+ return -EINVAL;
+
+ ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
+ "#freq-domain-cells", 0, &args);
+ of_node_put(cpu_np);
+ if (ret)
+ return ret;
+
+ index = args.args[0];
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, index);
+ if (!res) {
+ dev_err(dev, "failed to get mem resource %d\n", index);
+ return -ENODEV;
+ }
+
+ if (!request_mem_region(res->start, resource_size(res), res->name)) {
+ dev_err(dev, "failed to request resource %pR\n", res);
+ return -EBUSY;
+ }
+
+ base = ioremap(res->start, resource_size(res));
+ if (!base) {
+ dev_err(dev, "failed to map resource %pR\n", res);
+ ret = -ENOMEM;
+ goto release_region;
+ }
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data) {
+ ret = -ENOMEM;
+ goto unmap_base;
+ }
+
+ data->soc_data = of_device_get_match_data(&pdev->dev);
+ data->base = base;
+ data->res = res;
+
+ /* HW should be in enabled state to proceed */
+ if (!(readl_relaxed(base + data->soc_data->reg_enable) & 0x1)) {
+ dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index);
+ ret = -ENODEV;
+ goto error;
+ }
+
+ if (readl_relaxed(base + data->soc_data->reg_dcvs_ctrl) & 0x1)
+ data->per_core_dcvs = true;
+
+ qcom_get_related_cpus(index, policy->cpus);
+ if (cpumask_empty(policy->cpus)) {
+ dev_err(dev, "Domain-%d failed to get related CPUs\n", index);
+ ret = -ENOENT;
+ goto error;
+ }
+
+ policy->driver_data = data;
+ policy->dvfs_possible_from_any_cpu = true;
+
+ ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy);
+ if (ret) {
+ dev_err(dev, "Domain-%d failed to read LUT\n", index);
+ goto error;
+ }
+
+ ret = dev_pm_opp_get_opp_count(cpu_dev);
+ if (ret <= 0) {
+ dev_err(cpu_dev, "Failed to add OPPs\n");
+ ret = -ENODEV;
+ goto error;
+ }
+
+ if (policy_has_boost_freq(policy)) {
+ ret = cpufreq_enable_boost_support();
+ if (ret)
+ dev_warn(cpu_dev, "failed to enable boost: %d\n", ret);
+ }
+
+ ret = qcom_cpufreq_hw_lmh_init(policy, index);
+ if (ret)
+ goto error;
+
+ return 0;
+error:
+ kfree(data);
+unmap_base:
+ iounmap(base);
+release_region:
+ release_mem_region(res->start, resource_size(res));
+ return ret;
+}
+
+static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
+{
+ struct device *cpu_dev = get_cpu_device(policy->cpu);
+ struct qcom_cpufreq_data *data = policy->driver_data;
+ struct resource *res = data->res;
+ void __iomem *base = data->base;
+
+ dev_pm_opp_remove_all_dynamic(cpu_dev);
+ dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
+ qcom_cpufreq_hw_lmh_exit(data);
+ kfree(policy->freq_table);
+ kfree(data);
+ iounmap(base);
+ release_mem_region(res->start, resource_size(res));
+
+ return 0;
+}
+
+static void qcom_cpufreq_ready(struct cpufreq_policy *policy)
+{
+ struct qcom_cpufreq_data *data = policy->driver_data;
+
+ if (data->throttle_irq >= 0)
+ enable_irq(data->throttle_irq);
+}
+
+static struct freq_attr *qcom_cpufreq_hw_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ &cpufreq_freq_attr_scaling_boost_freqs,
+ NULL
+};
+
+static struct cpufreq_driver cpufreq_qcom_hw_driver = {
+ .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
+ CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
+ CPUFREQ_IS_COOLING_DEV,
+ .verify = cpufreq_generic_frequency_table_verify,
+ .target_index = qcom_cpufreq_hw_target_index,
+ .get = qcom_cpufreq_hw_get,
+ .init = qcom_cpufreq_hw_cpu_init,
+ .exit = qcom_cpufreq_hw_cpu_exit,
+ .online = qcom_cpufreq_hw_cpu_online,
+ .offline = qcom_cpufreq_hw_cpu_offline,
+ .register_em = cpufreq_register_em_with_opp,
+ .fast_switch = qcom_cpufreq_hw_fast_switch,
+ .name = "qcom-cpufreq-hw",
+ .attr = qcom_cpufreq_hw_attr,
+ .ready = qcom_cpufreq_ready,
+};
+
+static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
+{
+ struct device *cpu_dev;
+ struct clk *clk;
+ int ret;
+
+ clk = clk_get(&pdev->dev, "xo");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ xo_rate = clk_get_rate(clk);
+ clk_put(clk);
+
+ clk = clk_get(&pdev->dev, "alternate");
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
+ clk_put(clk);
+
+ cpufreq_qcom_hw_driver.driver_data = pdev;
+
+ /* Check for optional interconnect paths on CPU0 */
+ cpu_dev = get_cpu_device(0);
+ if (!cpu_dev)
+ return -EPROBE_DEFER;
+
+ ret = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL);
+ if (ret)
+ return ret;
+
+ ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver);
+ if (ret)
+ dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n");
+ else
+ dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n");
+
+ return ret;
+}
+
+static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev)
+{
+ return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver);
+}
+
+static struct platform_driver qcom_cpufreq_hw_driver = {
+ .probe = qcom_cpufreq_hw_driver_probe,
+ .remove = qcom_cpufreq_hw_driver_remove,
+ .driver = {
+ .name = "qcom-cpufreq-hw",
+ .of_match_table = qcom_cpufreq_hw_match,
+ },
+};
+
+static int __init qcom_cpufreq_hw_init(void)
+{
+ return platform_driver_register(&qcom_cpufreq_hw_driver);
+}
+postcore_initcall(qcom_cpufreq_hw_init);
+
+static void __exit qcom_cpufreq_hw_exit(void)
+{
+ platform_driver_unregister(&qcom_cpufreq_hw_driver);
+}
+module_exit(qcom_cpufreq_hw_exit);
+
+MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver");
+MODULE_LICENSE("GPL v2");