[RFC 03/10] cpufreq: exynos: Remove support for Exynos5440

Krzysztof Kozlowski
2018-04-24T20:32:32Z

The Exynos5440 is not actively developed, there are no development
boards available and probably there are no real products with it.
Remove wide-tree support for Exynos5440.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
.../bindings/cpufreq/cpufreq-exynos5440.txt | 28 --
drivers/cpufreq/Kconfig.arm | 14 -
drivers/cpufreq/Makefile | 1 -
drivers/cpufreq/exynos5440-cpufreq.c | 452 ---------------------
4 files changed, 495 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt
delete mode 100644 drivers/cpufreq/exynos5440-cpufreq.c

diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt
deleted file mode 100644
index caff1a57436f..000000000000
--- a/Documentation/devicetree/bindings/cpufreq/cpufreq-exynos5440.txt
+++ /dev/null
@@ -1,28 +0,0 @@
-
-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 7f56fe5183f2..538a4004a2c5 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -81,20 +81,6 @@ config ARM_BRCMSTB_AVS_CPUFREQ_DEBUG

If in doubt, say N.

-config ARM_EXYNOS5440_CPUFREQ
- tristate "SAMSUNG EXYNOS5440"
- depends on SOC_EXYNOS5440
- depends on HAVE_CLK && OF
- select PM_OPP
- default y
- 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.
-
- If in doubt, say N.
-
config ARM_HIGHBANK_CPUFREQ
tristate "Calxeda Highbank-based"
depends on ARCH_HIGHBANK && CPUFREQ_DT && REGULATOR
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 8d24ade3bd02..56724f867f78 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -56,7 +56,6 @@ obj-$(CONFIG_ARM_ARMADA_37XX_CPUFREQ) += armada-37xx-cpufreq.o
obj-$(CONFIG_ARM_BRCMSTB_AVS_CPUFREQ) += brcmstb-avs-cpufreq.o
obj-$(CONFIG_ACPI_CPPC_CPUFREQ) += cppc_cpufreq.o
obj-$(CONFIG_ARCH_DAVINCI) += davinci-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_KIRKWOOD_CPUFREQ) += kirkwood-cpufreq.o
diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
deleted file mode 100644
index 932caa386ece..000000000000
--- a/drivers/cpufreq/exynos5440-cpufreq.c
+++ /dev/null
@@ -1,452 +0,0 @@
-/*
- * 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/pm_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 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 *pos, *freq_tbl = dvfs_info->freq_table;
- unsigned int tmp, clk_div, ema_div, freq, volt_id, idx;
- struct dev_pm_opp *opp;
-
- cpufreq_for_each_entry_idx(pos, freq_tbl, idx) {
- opp = dev_pm_opp_find_freq_exact(dvfs_info->dev,
- pos->frequency * 1000, true);
- if (IS_ERR(opp)) {
- dev_err(dvfs_info->dev,
- "failed to find valid OPP for %u KHZ\n",
- pos->frequency);
- return PTR_ERR(opp);
- }
-
- freq = pos->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 = dev_pm_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 * idx);
- dev_pm_opp_put(opp);
- }
-
- return 0;
-}
-
-static void exynos_enable_dvfs(unsigned int cur_frequency)
-{
- unsigned int tmp, cpu;
- struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
- struct cpufreq_frequency_table *pos;
- /* 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 */
- cpufreq_for_each_entry(pos, freq_table)
- if (pos->frequency == cur_frequency)
- break;
-
- if (pos->frequency == CPUFREQ_TABLE_END) {
- dev_crit(dvfs_info->dev, "Boot up frequency not supported\n");
- /* Assign the highest frequency */
- pos = freq_table;
- cur_frequency = pos->frequency;
- }
-
- dev_info(dvfs_info->dev, "Setting dvfs initial frequency = %uKHZ",
- 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 |= ((pos - freq_table) << 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_target(struct cpufreq_policy *policy, unsigned int index)
-{
- unsigned int tmp;
- int i;
- struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
-
- mutex_lock(&cpufreq_lock);
-
- freqs.old = policy->cur;
- freqs.new = freq_table[index].frequency;
-
- cpufreq_freq_transition_begin(policy, &freqs);
-
- /* 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);
- }
- mutex_unlock(&cpufreq_lock);
- return 0;
-}
-
-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 = policy->cur;
-
- 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;
- } else {
- dev_crit(dvfs_info->dev, "New frequency out of range\n");
- freqs.new = freqs.old;
- }
- cpufreq_freq_transition_end(policy, &freqs, 0);
-
- 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)
-{
- policy->clk = dvfs_info->cpu_clk;
- return cpufreq_generic_init(policy, dvfs_info->freq_table,
- dvfs_info->latency);
-}
-
-static struct cpufreq_driver exynos_driver = {
- .flags = CPUFREQ_STICKY | CPUFREQ_ASYNC_NOTIFICATION |
- CPUFREQ_NEED_INITIAL_FREQ_CHECK,
- .verify = cpufreq_generic_frequency_table_verify,
- .target_index = exynos_target,
- .get = cpufreq_generic_get,
- .init = exynos_cpufreq_cpu_init,
- .name = CPUFREQ_NAME,
- .attr = cpufreq_generic_attr,
-};
-
-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;
- unsigned int cur_frequency;
-
- 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 = dev_pm_opp_of_add_table(dvfs_info->dev);
- if (ret) {
- dev_err(dvfs_info->dev, "failed to init OPP table: %d\n", ret);
- goto err_put_node;
- }
-
- ret = dev_pm_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_free_opp;
- }
- dvfs_info->freq_count = dev_pm_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;
- }
-
- cur_frequency = clk_get_rate(dvfs_info->cpu_clk);
- if (!cur_frequency) {
- dev_err(dvfs_info->dev, "Failed to get clock rate\n");
- ret = -EINVAL;
- goto err_free_table;
- }
- 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(cur_frequency);
- 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:
- dev_pm_opp_free_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
-err_free_opp:
- dev_pm_opp_of_remove_table(dvfs_info->dev);
-err_put_node:
- of_node_put(np);
- dev_err(&pdev->dev, "%s: failed initialization\n", __func__);
- return ret;
-}
-
-static int exynos_cpufreq_remove(struct platform_device *pdev)
-{
- cpufreq_unregister_driver(&exynos_driver);
- dev_pm_opp_free_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
- dev_pm_opp_of_remove_table(dvfs_info->dev);
- return 0;
-}
-
-static struct platform_driver exynos_cpufreq_platdrv = {
- .driver = {
- .name = "exynos5440-cpufreq",
- .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");
--
2.14.1