Merge back earlier cpufreq material for v4.1.

7 files changed, 206 insertions, 73 deletions

diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index a171fef2c2b6..659879a56dba 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -293,5 +293,13 @@ config SH_CPU_FREQ
           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
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 1b06fc4640e2..4f3dbc8cf729 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -108,6 +108,15 @@ config ARM_HIGHBANK_CPUFREQ
 
           If in doubt, say N.
 
+config ARM_HISI_ACPU_CPUFREQ
+        tristate "Hisilicon ACPU CPUfreq driver"
+        depends on ARCH_HISI && CPUFREQ_DT
+        select PM_OPP
+        help
+          This enables the hisilicon ACPU CPUfreq driver.
+
+          If in doubt, say N.
+
 config ARM_IMX6Q_CPUFREQ
         tristate "Freescale i.MX6 cpufreq support"
         depends on ARCH_MXC
diff --git a/drivers/cpufreq/Kconfig.powerpc b/drivers/cpufreq/Kconfig.powerpc
index 7ea24413cee6..3a0595b41eab 100644
--- a/drivers/cpufreq/Kconfig.powerpc
+++ b/drivers/cpufreq/Kconfig.powerpc
@@ -23,15 +23,6 @@ config CPU_FREQ_MAPLE
           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
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 82a1821471fd..cdce92ae2e8b 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -59,6 +59,7 @@ arm-exynos-cpufreq-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ)	+= exynos4x12-cpufreq.o
 arm-exynos-cpufreq-$(CONFIG_ARM_EXYNOS5250_CPUFREQ)     += exynos5250-cpufreq.o
 obj-$(CONFIG_ARM_EXYNOS5440_CPUFREQ)    += exynos5440-cpufreq.o
 obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ)      += highbank-cpufreq.o
+obj-$(CONFIG_ARM_HISI_ACPU_CPUFREQ)     += hisi-acpu-cpufreq.o
 obj-$(CONFIG_ARM_IMX6Q_CPUFREQ)         += imx6q-cpufreq.o
 obj-$(CONFIG_ARM_INTEGRATOR)            += integrator-cpufreq.o
 obj-$(CONFIG_ARM_KIRKWOOD_CPUFREQ)      += kirkwood-cpufreq.o
@@ -85,7 +86,7 @@ obj-$(CONFIG_CPU_FREQ_CBE)		+= ppc-cbe-cpufreq.o
 ppc-cbe-cpufreq-y                       += ppc_cbe_cpufreq_pervasive.o ppc_cbe_cpufreq.o
 obj-$(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
diff --git a/drivers/cpufreq/hisi-acpu-cpufreq.c b/drivers/cpufreq/hisi-acpu-cpufreq.c
new file mode 100644
index 000000000000..026d5b2224de
--- /dev/null
+++ b/drivers/cpufreq/hisi-acpu-cpufreq.c
@@ -0,0 +1,42 @@
+/*
+ * Hisilicon Platforms Using ACPU CPUFreq Support
+ *
+ * Copyright (c) 2015 Hisilicon Limited.
+ * Copyright (c) 2015 Linaro Limited.
+ *
+ * Leo Yan <leo.yan@linaro.org>
+ *
+ * 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.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+static int __init hisi_acpu_cpufreq_driver_init(void)
+{
+        struct platform_device *pdev;
+
+        if (!of_machine_is_compatible("hisilicon,hi6220"))
+                return -ENODEV;
+
+        pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
+        return PTR_ERR_OR_ZERO(pdev);
+}
+module_init(hisi_acpu_cpufreq_driver_init);
+
+MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
+MODULE_DESCRIPTION("Hisilicon acpu cpufreq driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index 2dfd4fdb5a52..ebef0d8279c7 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -34,9 +34,13 @@
 #include <asm/smp.h> /* Required for cpu_sibling_mask() in UP configs */
 
 #define POWERNV_MAX_PSTATES     256
+#define PMSR_PSAFE_ENABLE       (1UL << 30)
+#define PMSR_SPR_EM_DISABLE     (1UL << 31)
+#define PMSR_MAX(x)             ((x >> 32) & 0xFF)
+#define PMSR_LP(x)              ((x >> 48) & 0xFF)
 
 static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1];
-static bool rebooting;
+static bool rebooting, throttled;
 
 /*
  * Note: The set of pstates consists of contiguous integers, the
@@ -294,6 +298,44 @@ static inline unsigned int get_nominal_index(void)
         return powernv_pstate_info.max - powernv_pstate_info.nominal;
 }
 
+static void powernv_cpufreq_throttle_check(unsigned int cpu)
+{
+        unsigned long pmsr;
+        int pmsr_pmax, pmsr_lp;
+
+        pmsr = get_pmspr(SPRN_PMSR);
+
+        /* Check for Pmax Capping */
+        pmsr_pmax = (s8)PMSR_MAX(pmsr);
+        if (pmsr_pmax != powernv_pstate_info.max) {
+                throttled = true;
+                pr_info("CPU %d Pmax is reduced to %d\n", cpu, pmsr_pmax);
+                pr_info("Max allowed Pstate is capped\n");
+        }
+
+        /*
+         * Check for Psafe by reading LocalPstate
+         * or check if Psafe_mode_active is set in PMSR.
+         */
+        pmsr_lp = (s8)PMSR_LP(pmsr);
+        if ((pmsr_lp < powernv_pstate_info.min) ||
+                                (pmsr & PMSR_PSAFE_ENABLE)) {
+                throttled = true;
+                pr_info("Pstate set to safe frequency\n");
+        }
+
+        /* Check if SPR_EM_DISABLE is set in PMSR */
+        if (pmsr & PMSR_SPR_EM_DISABLE) {
+                throttled = true;
+                pr_info("Frequency Control disabled from OS\n");
+        }
+
+        if (throttled) {
+                pr_info("PMSR = %16lx\n", pmsr);
+                pr_crit("CPU Frequency could be throttled\n");
+        }
+}
+
 /*
  * powernv_cpufreq_target_index: Sets the frequency corresponding to
  * the cpufreq table entry indexed by new_index on the cpus in the
@@ -307,6 +349,9 @@ static int powernv_cpufreq_target_index(struct cpufreq_policy *policy,
         if (unlikely(rebooting) && new_index != get_nominal_index())
                 return 0;
 
+        if (!throttled)
+                powernv_cpufreq_throttle_check(smp_processor_id());
+
         freq_data.pstate_id = powernv_freqs[new_index].driver_data;
 
         /*
diff --git a/drivers/cpufreq/ppc-corenet-cpufreq.c b/drivers/cpufreq/qoriq-cpufreq.c
index 7cb4b766cf94..9fd51c860308 100644
--- a/drivers/cpufreq/ppc-corenet-cpufreq.c
+++ b/drivers/cpufreq/qoriq-cpufreq.c
@@ -1,7 +1,7 @@
 /*
  * Copyright 2013 Freescale Semiconductor, Inc.
  *
- * CPU Frequency Scaling driver for Freescale PowerPC corenet SoCs.
+ * 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
@@ -20,12 +20,11 @@
 #include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/smp.h>
-#include <sysdev/fsl_soc.h>
 
 #include <asm/smp.h>    /* for get_hard_smp_processor_id() in UP configs */
 
 /**
- * struct cpu_data - per CPU data struct
+ * struct cpu_data
  * @parent: the parent node of cpu clock
  * @table: frequency table
  */
@@ -69,17 +68,78 @@ static const struct soc_data sdata[] = {
 static u32 min_cpufreq;
 static const u32 *fmask;
 
-static DEFINE_PER_CPU(struct cpu_data *, cpu_data);
+#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);
 
-/* cpumask in a cluster */
-static DEFINE_PER_CPU(cpumask_var_t, cpu_mask);
+        return sysfreq;
+}
 
-#ifndef CONFIG_SMP
-static inline const struct cpumask *cpu_core_mask(int cpu)
+static struct device_node *cpu_to_clk_node(int cpu)
 {
-        return cpumask_of(0);
+        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);
 }
-#endif
 
 /* reduce the duplicated frequencies in frequency table */
 static void freq_table_redup(struct cpufreq_frequency_table *freq_table,
@@ -107,6 +167,7 @@ static void freq_table_sort(struct cpufreq_frequency_table *freq_table,
         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;
@@ -131,7 +192,7 @@ static void freq_table_sort(struct cpufreq_frequency_table *freq_table,
         }
 }
 
-static int corenet_cpufreq_cpu_init(struct cpufreq_policy *policy)
+static int qoriq_cpufreq_cpu_init(struct cpufreq_policy *policy)
 {
         struct device_node *np;
         int i, count, ret;
@@ -147,10 +208,8 @@ static int corenet_cpufreq_cpu_init(struct cpufreq_policy *policy)
                 return -ENODEV;
 
         data = kzalloc(sizeof(*data), GFP_KERNEL);
-        if (!data) {
-                pr_err("%s: no memory\n", __func__);
+        if (!data)
                 goto err_np;
-        }
 
         policy->clk = of_clk_get(np, 0);
         if (IS_ERR(policy->clk)) {
@@ -172,7 +231,7 @@ static int corenet_cpufreq_cpu_init(struct cpufreq_policy *policy)
         }
 
         if (fmask)
-                mask = fmask[get_hard_smp_processor_id(cpu)];
+                mask = fmask[get_cpu_physical_id(cpu)];
         else
                 mask = 0x0;
 
@@ -203,13 +262,12 @@ static int corenet_cpufreq_cpu_init(struct cpufreq_policy *policy)
         data->table = table;
 
         /* update ->cpus if we have cluster, no harm if not */
-        cpumask_copy(policy->cpus, per_cpu(cpu_mask, cpu));
-        for_each_cpu(i, per_cpu(cpu_mask, cpu))
-                per_cpu(cpu_data, i) = data;
+        set_affected_cpus(policy);
+        policy->driver_data = data;
 
         /* Minimum transition latency is 12 platform clocks */
         u64temp = 12ULL * NSEC_PER_SEC;
-        do_div(u64temp, fsl_get_sys_freq());
+        do_div(u64temp, get_bus_freq());
         policy->cpuinfo.transition_latency = u64temp + 1;
 
         of_node_put(np);
@@ -221,7 +279,7 @@ err_nomem1:
 err_node:
         of_node_put(data->parent);
 err_nomem2:
-        per_cpu(cpu_data, cpu) = NULL;
+        policy->driver_data = NULL;
         kfree(data);
 err_np:
         of_node_put(np);
@@ -229,43 +287,40 @@ err_np:
         return -ENODEV;
 }
 
-static int __exit corenet_cpufreq_cpu_exit(struct cpufreq_policy *policy)
+static int __exit qoriq_cpufreq_cpu_exit(struct cpufreq_policy *policy)
 {
-        struct cpu_data *data = per_cpu(cpu_data, policy->cpu);
-        unsigned int cpu;
+        struct cpu_data *data = policy->driver_data;
 
         of_node_put(data->parent);
         kfree(data->table);
         kfree(data);
-
-        for_each_cpu(cpu, per_cpu(cpu_mask, policy->cpu))
-                per_cpu(cpu_data, cpu) = NULL;
+        policy->driver_data = NULL;
 
         return 0;
 }
 
-static int corenet_cpufreq_target(struct cpufreq_policy *policy,
+static int qoriq_cpufreq_target(struct cpufreq_policy *policy,
                 unsigned int index)
 {
         struct clk *parent;
-        struct cpu_data *data = per_cpu(cpu_data, policy->cpu);
+        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 ppc_corenet_cpufreq_driver = {
-        .name           = "ppc_cpufreq",
+static struct cpufreq_driver qoriq_cpufreq_driver = {
+        .name           = "qoriq_cpufreq",
         .flags          = CPUFREQ_CONST_LOOPS,
-        .init           = corenet_cpufreq_cpu_init,
-        .exit           = __exit_p(corenet_cpufreq_cpu_exit),
+        .init           = qoriq_cpufreq_cpu_init,
+        .exit           = __exit_p(qoriq_cpufreq_cpu_exit),
         .verify         = cpufreq_generic_frequency_table_verify,
-        .target_index   = corenet_cpufreq_target,
+        .target_index   = qoriq_cpufreq_target,
         .get            = cpufreq_generic_get,
         .attr           = cpufreq_generic_attr,
 };
 
-static const struct of_device_id node_matches[] __initdata = {
+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], },
@@ -275,61 +330,43 @@ static const struct of_device_id node_matches[] __initdata = {
         {}
 };
 
-static int __init ppc_corenet_cpufreq_init(void)
+static int __init qoriq_cpufreq_init(void)
 {
         int ret;
         struct device_node  *np;
         const struct of_device_id *match;
         const struct soc_data *data;
-        unsigned int cpu;
 
         np = of_find_matching_node(NULL, node_matches);
         if (!np)
                 return -ENODEV;
 
-        for_each_possible_cpu(cpu) {
-                if (!alloc_cpumask_var(&per_cpu(cpu_mask, cpu), GFP_KERNEL))
-                        goto err_mask;
-                cpumask_copy(per_cpu(cpu_mask, cpu), cpu_core_mask(cpu));
-        }
-
         match = of_match_node(node_matches, np);
         data = match->data;
         if (data) {
                 if (data->flag)
                         fmask = data->freq_mask;
-                min_cpufreq = fsl_get_sys_freq();
+                min_cpufreq = get_bus_freq();
         } else {
-                min_cpufreq = fsl_get_sys_freq() / 2;
+                min_cpufreq = get_bus_freq() / 2;
         }
 
         of_node_put(np);
 
-        ret = cpufreq_register_driver(&ppc_corenet_cpufreq_driver);
+        ret = cpufreq_register_driver(&qoriq_cpufreq_driver);
         if (!ret)
-                pr_info("Freescale PowerPC corenet CPU frequency scaling driver\n");
+                pr_info("Freescale QorIQ CPU frequency scaling driver\n");
 
         return ret;
-
-err_mask:
-        for_each_possible_cpu(cpu)
-                free_cpumask_var(per_cpu(cpu_mask, cpu));
-
-        return -ENOMEM;
 }
-module_init(ppc_corenet_cpufreq_init);
+module_init(qoriq_cpufreq_init);
 
-static void __exit ppc_corenet_cpufreq_exit(void)
+static void __exit qoriq_cpufreq_exit(void)
 {
-        unsigned int cpu;
-
-        for_each_possible_cpu(cpu)
-                free_cpumask_var(per_cpu(cpu_mask, cpu));
-
-        cpufreq_unregister_driver(&ppc_corenet_cpufreq_driver);
+        cpufreq_unregister_driver(&qoriq_cpufreq_driver);
 }
-module_exit(ppc_corenet_cpufreq_exit);
+module_exit(qoriq_cpufreq_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
-MODULE_DESCRIPTION("cpufreq driver for Freescale e500mc series SoCs");
+MODULE_DESCRIPTION("cpufreq driver for Freescale QorIQ series SoCs");