If unsure, say N.
endif
+config QORIQ_CPUFREQ
+ tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
+ depends on OF && COMMON_CLK && (PPC_E500MC || ARM)
+ select CLK_QORIQ
+ help
+ This adds the CPUFreq driver support for Freescale QorIQ SoCs
+ which are capable of changing the CPU's frequency dynamically.
+
endif
endmenu
This adds support for frequency switching on Maple 970FX
Evaluation Board and compatible boards (IBM JS2x blades).
-config PPC_CORENET_CPUFREQ
- tristate "CPU frequency scaling driver for Freescale E500MC SoCs"
- depends on PPC_E500MC && OF && COMMON_CLK
- select CLK_QORIQ
- help
- This adds the CPUFreq driver support for Freescale e500mc,
- e5500 and e6500 series SoCs which are capable of changing
- the CPU's frequency dynamically.
-
config CPU_FREQ_PMAC
bool "Support for Apple PowerBooks"
depends on ADB_PMU && PPC32
ppc-cbe-cpufreq-y += ppc_cbe_cpufreq_pervasive.o ppc_cbe_cpufreq.o
obj-$(CONFIG_CPU_FREQ_CBE_PMI) += ppc_cbe_cpufreq_pmi.o
obj-$(CONFIG_CPU_FREQ_MAPLE) += maple-cpufreq.o
-obj-$(CONFIG_PPC_CORENET_CPUFREQ) += ppc-corenet-cpufreq.o
+obj-$(CONFIG_QORIQ_CPUFREQ) += qoriq-cpufreq.o
obj-$(CONFIG_CPU_FREQ_PMAC) += pmac32-cpufreq.o
obj-$(CONFIG_CPU_FREQ_PMAC64) += pmac64-cpufreq.o
obj-$(CONFIG_PPC_PASEMI_CPUFREQ) += pasemi-cpufreq.o
+++ /dev/null
-/*
- * Copyright 2013 Freescale Semiconductor, Inc.
- *
- * CPU Frequency Scaling driver for Freescale QorIQ SoCs.
- *
- * 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.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/clk.h>
-#include <linux/cpufreq.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/slab.h>
-#include <linux/smp.h>
-
-#include <asm/smp.h> /* for get_hard_smp_processor_id() in UP configs */
-
-/**
- * struct cpu_data
- * @parent: the parent node of cpu clock
- * @table: frequency table
- */
-struct cpu_data {
- struct device_node *parent;
- struct cpufreq_frequency_table *table;
-};
-
-/**
- * struct soc_data - SoC specific data
- * @freq_mask: mask the disallowed frequencies
- * @flag: unique flags
- */
-struct soc_data {
- u32 freq_mask[4];
- u32 flag;
-};
-
-#define FREQ_MASK 1
-/* see hardware specification for the allowed frqeuencies */
-static const struct soc_data sdata[] = {
- { /* used by p2041 and p3041 */
- .freq_mask = {0x8, 0x8, 0x2, 0x2},
- .flag = FREQ_MASK,
- },
- { /* used by p5020 */
- .freq_mask = {0x8, 0x2},
- .flag = FREQ_MASK,
- },
- { /* used by p4080, p5040 */
- .freq_mask = {0},
- .flag = 0,
- },
-};
-
-/*
- * the minimum allowed core frequency, in Hz
- * for chassis v1.0, >= platform frequency
- * for chassis v2.0, >= platform frequency / 2
- */
-static u32 min_cpufreq;
-static const u32 *fmask;
-
-#if defined(CONFIG_ARM)
-static int get_cpu_physical_id(int cpu)
-{
- return topology_core_id(cpu);
-}
-#else
-static int get_cpu_physical_id(int cpu)
-{
- return get_hard_smp_processor_id(cpu);
-}
-#endif
-
-static u32 get_bus_freq(void)
-{
- struct device_node *soc;
- u32 sysfreq;
-
- soc = of_find_node_by_type(NULL, "soc");
- if (!soc)
- return 0;
-
- if (of_property_read_u32(soc, "bus-frequency", &sysfreq))
- sysfreq = 0;
-
- of_node_put(soc);
-
- return sysfreq;
-}
-
-static struct device_node *cpu_to_clk_node(int cpu)
-{
- struct device_node *np, *clk_np;
-
- if (!cpu_present(cpu))
- return NULL;
-
- np = of_get_cpu_node(cpu, NULL);
- if (!np)
- return NULL;
-
- clk_np = of_parse_phandle(np, "clocks", 0);
- if (!clk_np)
- return NULL;
-
- of_node_put(np);
-
- return clk_np;
-}
-
-/* traverse cpu nodes to get cpu mask of sharing clock wire */
-static void set_affected_cpus(struct cpufreq_policy *policy)
-{
- struct device_node *np, *clk_np;
- struct cpumask *dstp = policy->cpus;
- int i;
-
- np = cpu_to_clk_node(policy->cpu);
- if (!np)
- return;
-
- for_each_present_cpu(i) {
- clk_np = cpu_to_clk_node(i);
- if (!clk_np)
- continue;
-
- if (clk_np == np)
- cpumask_set_cpu(i, dstp);
-
- of_node_put(clk_np);
- }
- of_node_put(np);
-}
-
-/* reduce the duplicated frequencies in frequency table */
-static void freq_table_redup(struct cpufreq_frequency_table *freq_table,
- int count)
-{
- int i, j;
-
- for (i = 1; i < count; i++) {
- for (j = 0; j < i; j++) {
- if (freq_table[j].frequency == CPUFREQ_ENTRY_INVALID ||
- freq_table[j].frequency !=
- freq_table[i].frequency)
- continue;
-
- freq_table[i].frequency = CPUFREQ_ENTRY_INVALID;
- break;
- }
- }
-}
-
-/* sort the frequencies in frequency table in descenting order */
-static void freq_table_sort(struct cpufreq_frequency_table *freq_table,
- int count)
-{
- int i, j, ind;
- unsigned int freq, max_freq;
- struct cpufreq_frequency_table table;
-
- for (i = 0; i < count - 1; i++) {
- max_freq = freq_table[i].frequency;
- ind = i;
- for (j = i + 1; j < count; j++) {
- freq = freq_table[j].frequency;
- if (freq == CPUFREQ_ENTRY_INVALID ||
- freq <= max_freq)
- continue;
- ind = j;
- max_freq = freq;
- }
-
- if (ind != i) {
- /* exchange the frequencies */
- table.driver_data = freq_table[i].driver_data;
- table.frequency = freq_table[i].frequency;
- freq_table[i].driver_data = freq_table[ind].driver_data;
- freq_table[i].frequency = freq_table[ind].frequency;
- freq_table[ind].driver_data = table.driver_data;
- freq_table[ind].frequency = table.frequency;
- }
- }
-}
-
-static int qoriq_cpufreq_cpu_init(struct cpufreq_policy *policy)
-{
- struct device_node *np;
- int i, count, ret;
- u32 freq, mask;
- struct clk *clk;
- struct cpufreq_frequency_table *table;
- struct cpu_data *data;
- unsigned int cpu = policy->cpu;
- u64 u64temp;
-
- np = of_get_cpu_node(cpu, NULL);
- if (!np)
- return -ENODEV;
-
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- goto err_np;
-
- policy->clk = of_clk_get(np, 0);
- if (IS_ERR(policy->clk)) {
- pr_err("%s: no clock information\n", __func__);
- goto err_nomem2;
- }
-
- data->parent = of_parse_phandle(np, "clocks", 0);
- if (!data->parent) {
- pr_err("%s: could not get clock information\n", __func__);
- goto err_nomem2;
- }
-
- count = of_property_count_strings(data->parent, "clock-names");
- table = kcalloc(count + 1, sizeof(*table), GFP_KERNEL);
- if (!table) {
- pr_err("%s: no memory\n", __func__);
- goto err_node;
- }
-
- if (fmask)
- mask = fmask[get_cpu_physical_id(cpu)];
- else
- mask = 0x0;
-
- for (i = 0; i < count; i++) {
- clk = of_clk_get(data->parent, i);
- freq = clk_get_rate(clk);
- /*
- * the clock is valid if its frequency is not masked
- * and large than minimum allowed frequency.
- */
- if (freq < min_cpufreq || (mask & (1 << i)))
- table[i].frequency = CPUFREQ_ENTRY_INVALID;
- else
- table[i].frequency = freq / 1000;
- table[i].driver_data = i;
- }
- freq_table_redup(table, count);
- freq_table_sort(table, count);
- table[i].frequency = CPUFREQ_TABLE_END;
-
- /* set the min and max frequency properly */
- ret = cpufreq_table_validate_and_show(policy, table);
- if (ret) {
- pr_err("invalid frequency table: %d\n", ret);
- goto err_nomem1;
- }
-
- data->table = table;
-
- /* update ->cpus if we have cluster, no harm if not */
- set_affected_cpus(policy);
- policy->driver_data = data;
-
- /* Minimum transition latency is 12 platform clocks */
- u64temp = 12ULL * NSEC_PER_SEC;
- do_div(u64temp, get_bus_freq());
- policy->cpuinfo.transition_latency = u64temp + 1;
-
- of_node_put(np);
-
- return 0;
-
-err_nomem1:
- kfree(table);
-err_node:
- of_node_put(data->parent);
-err_nomem2:
- policy->driver_data = NULL;
- kfree(data);
-err_np:
- of_node_put(np);
-
- return -ENODEV;
-}
-
-static int __exit qoriq_cpufreq_cpu_exit(struct cpufreq_policy *policy)
-{
- struct cpu_data *data = policy->driver_data;
-
- of_node_put(data->parent);
- kfree(data->table);
- kfree(data);
- policy->driver_data = NULL;
-
- return 0;
-}
-
-static int qoriq_cpufreq_target(struct cpufreq_policy *policy,
- unsigned int index)
-{
- struct clk *parent;
- struct cpu_data *data = policy->driver_data;
-
- parent = of_clk_get(data->parent, data->table[index].driver_data);
- return clk_set_parent(policy->clk, parent);
-}
-
-static struct cpufreq_driver qoriq_cpufreq_driver = {
- .name = "qoriq_cpufreq",
- .flags = CPUFREQ_CONST_LOOPS,
- .init = qoriq_cpufreq_cpu_init,
- .exit = __exit_p(qoriq_cpufreq_cpu_exit),
- .verify = cpufreq_generic_frequency_table_verify,
- .target_index = qoriq_cpufreq_target,
- .get = cpufreq_generic_get,
- .attr = cpufreq_generic_attr,
-};
-
-static const struct of_device_id node_matches[] __initconst = {
- { .compatible = "fsl,p2041-clockgen", .data = &sdata[0], },
- { .compatible = "fsl,p3041-clockgen", .data = &sdata[0], },
- { .compatible = "fsl,p5020-clockgen", .data = &sdata[1], },
- { .compatible = "fsl,p4080-clockgen", .data = &sdata[2], },
- { .compatible = "fsl,p5040-clockgen", .data = &sdata[2], },
- { .compatible = "fsl,qoriq-clockgen-2.0", },
- {}
-};
-
-static int __init qoriq_cpufreq_init(void)
-{
- int ret;
- struct device_node *np;
- const struct of_device_id *match;
- const struct soc_data *data;
-
- np = of_find_matching_node(NULL, node_matches);
- if (!np)
- return -ENODEV;
-
- match = of_match_node(node_matches, np);
- data = match->data;
- if (data) {
- if (data->flag)
- fmask = data->freq_mask;
- min_cpufreq = get_bus_freq();
- } else {
- min_cpufreq = get_bus_freq() / 2;
- }
-
- of_node_put(np);
-
- ret = cpufreq_register_driver(&qoriq_cpufreq_driver);
- if (!ret)
- pr_info("Freescale QorIQ CPU frequency scaling driver\n");
-
- return ret;
-}
-module_init(qoriq_cpufreq_init);
-
-static void __exit qoriq_cpufreq_exit(void)
-{
- cpufreq_unregister_driver(&qoriq_cpufreq_driver);
-}
-module_exit(qoriq_cpufreq_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
-MODULE_DESCRIPTION("cpufreq driver for Freescale QorIQ series SoCs");
--- /dev/null
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * CPU Frequency Scaling driver for Freescale QorIQ SoCs.
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+
+#include <asm/smp.h> /* for get_hard_smp_processor_id() in UP configs */
+
+/**
+ * struct cpu_data
+ * @parent: the parent node of cpu clock
+ * @table: frequency table
+ */
+struct cpu_data {
+ struct device_node *parent;
+ struct cpufreq_frequency_table *table;
+};
+
+/**
+ * struct soc_data - SoC specific data
+ * @freq_mask: mask the disallowed frequencies
+ * @flag: unique flags
+ */
+struct soc_data {
+ u32 freq_mask[4];
+ u32 flag;
+};
+
+#define FREQ_MASK 1
+/* see hardware specification for the allowed frqeuencies */
+static const struct soc_data sdata[] = {
+ { /* used by p2041 and p3041 */
+ .freq_mask = {0x8, 0x8, 0x2, 0x2},
+ .flag = FREQ_MASK,
+ },
+ { /* used by p5020 */
+ .freq_mask = {0x8, 0x2},
+ .flag = FREQ_MASK,
+ },
+ { /* used by p4080, p5040 */
+ .freq_mask = {0},
+ .flag = 0,
+ },
+};
+
+/*
+ * the minimum allowed core frequency, in Hz
+ * for chassis v1.0, >= platform frequency
+ * for chassis v2.0, >= platform frequency / 2
+ */
+static u32 min_cpufreq;
+static const u32 *fmask;
+
+#if defined(CONFIG_ARM)
+static int get_cpu_physical_id(int cpu)
+{
+ return topology_core_id(cpu);
+}
+#else
+static int get_cpu_physical_id(int cpu)
+{
+ return get_hard_smp_processor_id(cpu);
+}
+#endif
+
+static u32 get_bus_freq(void)
+{
+ struct device_node *soc;
+ u32 sysfreq;
+
+ soc = of_find_node_by_type(NULL, "soc");
+ if (!soc)
+ return 0;
+
+ if (of_property_read_u32(soc, "bus-frequency", &sysfreq))
+ sysfreq = 0;
+
+ of_node_put(soc);
+
+ return sysfreq;
+}
+
+static struct device_node *cpu_to_clk_node(int cpu)
+{
+ struct device_node *np, *clk_np;
+
+ if (!cpu_present(cpu))
+ return NULL;
+
+ np = of_get_cpu_node(cpu, NULL);
+ if (!np)
+ return NULL;
+
+ clk_np = of_parse_phandle(np, "clocks", 0);
+ if (!clk_np)
+ return NULL;
+
+ of_node_put(np);
+
+ return clk_np;
+}
+
+/* traverse cpu nodes to get cpu mask of sharing clock wire */
+static void set_affected_cpus(struct cpufreq_policy *policy)
+{
+ struct device_node *np, *clk_np;
+ struct cpumask *dstp = policy->cpus;
+ int i;
+
+ np = cpu_to_clk_node(policy->cpu);
+ if (!np)
+ return;
+
+ for_each_present_cpu(i) {
+ clk_np = cpu_to_clk_node(i);
+ if (!clk_np)
+ continue;
+
+ if (clk_np == np)
+ cpumask_set_cpu(i, dstp);
+
+ of_node_put(clk_np);
+ }
+ of_node_put(np);
+}
+
+/* reduce the duplicated frequencies in frequency table */
+static void freq_table_redup(struct cpufreq_frequency_table *freq_table,
+ int count)
+{
+ int i, j;
+
+ for (i = 1; i < count; i++) {
+ for (j = 0; j < i; j++) {
+ if (freq_table[j].frequency == CPUFREQ_ENTRY_INVALID ||
+ freq_table[j].frequency !=
+ freq_table[i].frequency)
+ continue;
+
+ freq_table[i].frequency = CPUFREQ_ENTRY_INVALID;
+ break;
+ }
+ }
+}
+
+/* sort the frequencies in frequency table in descenting order */
+static void freq_table_sort(struct cpufreq_frequency_table *freq_table,
+ int count)
+{
+ int i, j, ind;
+ unsigned int freq, max_freq;
+ struct cpufreq_frequency_table table;
+
+ for (i = 0; i < count - 1; i++) {
+ max_freq = freq_table[i].frequency;
+ ind = i;
+ for (j = i + 1; j < count; j++) {
+ freq = freq_table[j].frequency;
+ if (freq == CPUFREQ_ENTRY_INVALID ||
+ freq <= max_freq)
+ continue;
+ ind = j;
+ max_freq = freq;
+ }
+
+ if (ind != i) {
+ /* exchange the frequencies */
+ table.driver_data = freq_table[i].driver_data;
+ table.frequency = freq_table[i].frequency;
+ freq_table[i].driver_data = freq_table[ind].driver_data;
+ freq_table[i].frequency = freq_table[ind].frequency;
+ freq_table[ind].driver_data = table.driver_data;
+ freq_table[ind].frequency = table.frequency;
+ }
+ }
+}
+
+static int qoriq_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+ struct device_node *np;
+ int i, count, ret;
+ u32 freq, mask;
+ struct clk *clk;
+ struct cpufreq_frequency_table *table;
+ struct cpu_data *data;
+ unsigned int cpu = policy->cpu;
+ u64 u64temp;
+
+ np = of_get_cpu_node(cpu, NULL);
+ if (!np)
+ return -ENODEV;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ goto err_np;
+
+ policy->clk = of_clk_get(np, 0);
+ if (IS_ERR(policy->clk)) {
+ pr_err("%s: no clock information\n", __func__);
+ goto err_nomem2;
+ }
+
+ data->parent = of_parse_phandle(np, "clocks", 0);
+ if (!data->parent) {
+ pr_err("%s: could not get clock information\n", __func__);
+ goto err_nomem2;
+ }
+
+ count = of_property_count_strings(data->parent, "clock-names");
+ table = kcalloc(count + 1, sizeof(*table), GFP_KERNEL);
+ if (!table) {
+ pr_err("%s: no memory\n", __func__);
+ goto err_node;
+ }
+
+ if (fmask)
+ mask = fmask[get_cpu_physical_id(cpu)];
+ else
+ mask = 0x0;
+
+ for (i = 0; i < count; i++) {
+ clk = of_clk_get(data->parent, i);
+ freq = clk_get_rate(clk);
+ /*
+ * the clock is valid if its frequency is not masked
+ * and large than minimum allowed frequency.
+ */
+ if (freq < min_cpufreq || (mask & (1 << i)))
+ table[i].frequency = CPUFREQ_ENTRY_INVALID;
+ else
+ table[i].frequency = freq / 1000;
+ table[i].driver_data = i;
+ }
+ freq_table_redup(table, count);
+ freq_table_sort(table, count);
+ table[i].frequency = CPUFREQ_TABLE_END;
+
+ /* set the min and max frequency properly */
+ ret = cpufreq_table_validate_and_show(policy, table);
+ if (ret) {
+ pr_err("invalid frequency table: %d\n", ret);
+ goto err_nomem1;
+ }
+
+ data->table = table;
+
+ /* update ->cpus if we have cluster, no harm if not */
+ set_affected_cpus(policy);
+ policy->driver_data = data;
+
+ /* Minimum transition latency is 12 platform clocks */
+ u64temp = 12ULL * NSEC_PER_SEC;
+ do_div(u64temp, get_bus_freq());
+ policy->cpuinfo.transition_latency = u64temp + 1;
+
+ of_node_put(np);
+
+ return 0;
+
+err_nomem1:
+ kfree(table);
+err_node:
+ of_node_put(data->parent);
+err_nomem2:
+ policy->driver_data = NULL;
+ kfree(data);
+err_np:
+ of_node_put(np);
+
+ return -ENODEV;
+}
+
+static int __exit qoriq_cpufreq_cpu_exit(struct cpufreq_policy *policy)
+{
+ struct cpu_data *data = policy->driver_data;
+
+ of_node_put(data->parent);
+ kfree(data->table);
+ kfree(data);
+ policy->driver_data = NULL;
+
+ return 0;
+}
+
+static int qoriq_cpufreq_target(struct cpufreq_policy *policy,
+ unsigned int index)
+{
+ struct clk *parent;
+ struct cpu_data *data = policy->driver_data;
+
+ parent = of_clk_get(data->parent, data->table[index].driver_data);
+ return clk_set_parent(policy->clk, parent);
+}
+
+static struct cpufreq_driver qoriq_cpufreq_driver = {
+ .name = "qoriq_cpufreq",
+ .flags = CPUFREQ_CONST_LOOPS,
+ .init = qoriq_cpufreq_cpu_init,
+ .exit = __exit_p(qoriq_cpufreq_cpu_exit),
+ .verify = cpufreq_generic_frequency_table_verify,
+ .target_index = qoriq_cpufreq_target,
+ .get = cpufreq_generic_get,
+ .attr = cpufreq_generic_attr,
+};
+
+static const struct of_device_id node_matches[] __initconst = {
+ { .compatible = "fsl,p2041-clockgen", .data = &sdata[0], },
+ { .compatible = "fsl,p3041-clockgen", .data = &sdata[0], },
+ { .compatible = "fsl,p5020-clockgen", .data = &sdata[1], },
+ { .compatible = "fsl,p4080-clockgen", .data = &sdata[2], },
+ { .compatible = "fsl,p5040-clockgen", .data = &sdata[2], },
+ { .compatible = "fsl,qoriq-clockgen-2.0", },
+ {}
+};
+
+static int __init qoriq_cpufreq_init(void)
+{
+ int ret;
+ struct device_node *np;
+ const struct of_device_id *match;
+ const struct soc_data *data;
+
+ np = of_find_matching_node(NULL, node_matches);
+ if (!np)
+ return -ENODEV;
+
+ match = of_match_node(node_matches, np);
+ data = match->data;
+ if (data) {
+ if (data->flag)
+ fmask = data->freq_mask;
+ min_cpufreq = get_bus_freq();
+ } else {
+ min_cpufreq = get_bus_freq() / 2;
+ }
+
+ of_node_put(np);
+
+ ret = cpufreq_register_driver(&qoriq_cpufreq_driver);
+ if (!ret)
+ pr_info("Freescale QorIQ CPU frequency scaling driver\n");
+
+ return ret;
+}
+module_init(qoriq_cpufreq_init);
+
+static void __exit qoriq_cpufreq_exit(void)
+{
+ cpufreq_unregister_driver(&qoriq_cpufreq_driver);
+}
+module_exit(qoriq_cpufreq_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
+MODULE_DESCRIPTION("cpufreq driver for Freescale QorIQ series SoCs");
projects / firefly-linux-kernel-4.4.55.git / commitdiff