@@ -15,6 +15,15 @@ config ARM_ALLWINNER_SUN50I_CPUFREQ_NVMEM
To compile this driver as a module, choose M here: the
module will be called sun50i-cpufreq-nvmem.
+config ARM_AIROHA_SOC_CPUFREQ
+ tristate "Airoha EN7581 SoC CPUFreq support"
+ depends on ARCH_AIROHA || (COMPILE_TEST && ARM64)
+ select PM_OPP
+ select PM_GENERIC_DOMAINS
+ default ARCH_AIROHA
+ help
+ This adds the CPUFreq driver for Airoha EN7581 SoCs.
+
config ARM_APPLE_SOC_CPUFREQ
tristate "Apple Silicon SoC CPUFreq support"
depends on ARCH_APPLE || (COMPILE_TEST && 64BIT)
@@ -52,6 +52,7 @@ obj-$(CONFIG_X86_AMD_FREQ_SENSITIVITY) += amd_freq_sensitivity.o
##################################################################################
# ARM SoC drivers
+obj-$(CONFIG_ARM_AIROHA_SOC_CPUFREQ) += airoha-cpufreq.o
obj-$(CONFIG_ARM_APPLE_SOC_CPUFREQ) += apple-soc-cpufreq.o
obj-$(CONFIG_ARM_ARMADA_37XX_CPUFREQ) += armada-37xx-cpufreq.o
obj-$(CONFIG_ARM_ARMADA_8K_CPUFREQ) += armada-8k-cpufreq.o
new file mode 100644
@@ -0,0 +1,222 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/arm-smccc.h>
+#include <linux/bitfield.h>
+#include <linux/cpufreq.h>
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include "cpufreq-dt.h"
+
+#define AIROHA_SIP_AVS_HANDLE 0x82000301
+#define AIROHA_AVS_OP_BASE 0xddddddd0
+#define AIROHA_AVS_OP_MASK GENMASK(1, 0)
+#define AIROHA_AVS_OP_FREQ_DYN_ADJ (AIROHA_AVS_OP_BASE | \
+ FIELD_PREP(AIROHA_AVS_OP_MASK, 0x1))
+#define AIROHA_AVS_OP_GET_FREQ (AIROHA_AVS_OP_BASE | \
+ FIELD_PREP(AIROHA_AVS_OP_MASK, 0x2))
+
+struct airoha_cpufreq_priv {
+ struct clk_hw hw;
+ struct generic_pm_domain pd;
+
+ int opp_token;
+ struct dev_pm_domain_list *pd_list;
+ struct platform_device *cpufreq_dt;
+};
+
+static long airoha_cpufreq_clk_round(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ return rate;
+}
+
+static unsigned long airoha_cpufreq_clk_get(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ const struct arm_smccc_1_2_regs args = {
+ .a0 = AIROHA_SIP_AVS_HANDLE,
+ .a1 = AIROHA_AVS_OP_GET_FREQ,
+ };
+ struct arm_smccc_1_2_regs res;
+
+ arm_smccc_1_2_smc(&args, &res);
+
+ /* SMCCC returns freq in MHz */
+ return (int)(res.a0 * 1000 * 1000);
+}
+
+/* Airoha CPU clk SMCC is always enabled */
+static int airoha_cpufreq_clk_is_enabled(struct clk_hw *hw)
+{
+ return true;
+}
+
+static const struct clk_ops airoha_cpufreq_clk_ops = {
+ .recalc_rate = airoha_cpufreq_clk_get,
+ .is_enabled = airoha_cpufreq_clk_is_enabled,
+ .round_rate = airoha_cpufreq_clk_round,
+};
+
+static const char * const airoha_cpufreq_clk_names[] = { "cpu", NULL };
+
+/* NOP function to disable OPP from setting clock */
+static int airoha_cpufreq_config_clks_nop(struct device *dev,
+ struct opp_table *opp_table,
+ struct dev_pm_opp *opp,
+ void *data, bool scaling_down)
+{
+ return 0;
+}
+
+static const char * const airoha_cpufreq_pd_names[] = { "cpu_pd" };
+
+static int airoha_cpufreq_set_performance_state(struct generic_pm_domain *domain,
+ unsigned int state)
+{
+ const struct arm_smccc_1_2_regs args = {
+ .a0 = AIROHA_SIP_AVS_HANDLE,
+ .a1 = AIROHA_AVS_OP_FREQ_DYN_ADJ,
+ .a3 = state,
+ };
+ struct arm_smccc_1_2_regs res;
+
+ arm_smccc_1_2_smc(&args, &res);
+
+ /* SMC signal correct apply by unsetting BIT 0 */
+ return res.a0 & BIT(0) ? -EINVAL : 0;
+}
+
+static int airoha_cpufreq_probe(struct platform_device *pdev)
+{
+ const struct dev_pm_domain_attach_data attach_data = {
+ .pd_names = airoha_cpufreq_pd_names,
+ .num_pd_names = ARRAY_SIZE(airoha_cpufreq_pd_names),
+ .pd_flags = PD_FLAG_DEV_LINK_ON | PD_FLAG_REQUIRED_OPP,
+ };
+ struct dev_pm_opp_config config = {
+ .clk_names = airoha_cpufreq_clk_names,
+ .config_clks = airoha_cpufreq_config_clks_nop,
+ };
+ struct platform_device *cpufreq_dt;
+ struct airoha_cpufreq_priv *priv;
+ struct device *dev = &pdev->dev;
+ const struct clk_init_data init = {
+ .name = "cpu",
+ .ops = &airoha_cpufreq_clk_ops,
+ /* Clock with no set_rate, can't cache */
+ .flags = CLK_GET_RATE_NOCACHE,
+ };
+ struct generic_pm_domain *pd;
+ struct device *cpu_dev;
+ int ret;
+
+ /* CPUs refer to the same OPP table */
+ cpu_dev = get_cpu_device(0);
+ if (!cpu_dev)
+ return -ENODEV;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ /* Init and register a get-only clk for Cpufreq */
+ priv->hw.init = &init;
+ ret = devm_clk_hw_register(dev, &priv->hw);
+ if (ret)
+ return ret;
+
+ ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
+ &priv->hw);
+ if (ret)
+ return ret;
+
+ /* Init and register a PD for Cpufreq */
+ pd = &priv->pd;
+ pd->name = "cpu_pd";
+ pd->flags = GENPD_FLAG_ALWAYS_ON;
+ pd->set_performance_state = airoha_cpufreq_set_performance_state;
+
+ ret = pm_genpd_init(pd, NULL, false);
+ if (ret)
+ return ret;
+
+ ret = of_genpd_add_provider_simple(dev->of_node, pd);
+ if (ret)
+ goto err_add_provider;
+
+ /* Set OPP table conf with NOP config_clks */
+ priv->opp_token = dev_pm_opp_set_config(cpu_dev, &config);
+ if (priv->opp_token < 0) {
+ ret = priv->opp_token;
+ dev_err(dev, "Failed to set OPP config\n");
+ goto err_set_config;
+ }
+
+ /* Attach PM for OPP */
+ ret = dev_pm_domain_attach_list(cpu_dev, &attach_data,
+ &priv->pd_list);
+ if (ret)
+ goto err_attach_pm;
+
+ cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
+ ret = PTR_ERR_OR_ZERO(cpufreq_dt);
+ if (ret) {
+ dev_err(dev, "failed to create cpufreq-dt device: %d\n", ret);
+ goto err_register_cpufreq;
+ }
+
+ priv->cpufreq_dt = cpufreq_dt;
+ platform_set_drvdata(pdev, priv);
+
+ return 0;
+
+err_register_cpufreq:
+ dev_pm_domain_detach_list(priv->pd_list);
+err_attach_pm:
+ dev_pm_opp_clear_config(priv->opp_token);
+err_set_config:
+ of_genpd_del_provider(dev->of_node);
+err_add_provider:
+ pm_genpd_remove(pd);
+
+ return ret;
+}
+
+static void airoha_cpufreq_remove(struct platform_device *pdev)
+{
+ struct airoha_cpufreq_priv *priv = platform_get_drvdata(pdev);
+
+ platform_device_unregister(priv->cpufreq_dt);
+
+ dev_pm_domain_detach_list(priv->pd_list);
+
+ dev_pm_opp_clear_config(priv->opp_token);
+
+ of_genpd_del_provider(pdev->dev.of_node);
+ pm_genpd_remove(&priv->pd);
+}
+
+static const struct of_device_id airoha_cpufreq_of_match[] = {
+ { .compatible = "airoha,en7581-cpufreq" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, airoha_cpufreq_of_match);
+
+static struct platform_driver airoha_cpufreq_driver = {
+ .probe = airoha_cpufreq_probe,
+ .remove_new = airoha_cpufreq_remove,
+ .driver = {
+ .name = "airoha-cpufreq",
+ .of_match_table = airoha_cpufreq_of_match,
+ },
+};
+module_platform_driver(airoha_cpufreq_driver);
+
+MODULE_AUTHOR("Christian Marangi <ansuelsmth@gmail.com>");
+MODULE_DESCRIPTION("CPUfreq driver for Airoha SoCs");
+MODULE_LICENSE("GPL");
@@ -103,6 +103,8 @@ static const struct of_device_id allowlist[] __initconst = {
* platforms using "operating-points-v2" property.
*/
static const struct of_device_id blocklist[] __initconst = {
+ { .compatible = "airoha,en7581", },
+
{ .compatible = "allwinner,sun50i-h6", },
{ .compatible = "allwinner,sun50i-h616", },
{ .compatible = "allwinner,sun50i-h618", },
Add simple CPU Freq driver for Airoha EN7581 SoC that control CPU frequency scaling with SMC APIs and register a generic "cpufreq-dt" device. CPUFreq driver registers a get-only clock to get the current global CPU frequency from SMC and a Power Domain to configure the performance state for each OPP to apply the requested frequency from cpufreq-dt. This is needed as SMC use index instead of raw frequency. All CPU share the same frequency and can't be controlled independently. Current shared CPU frequency is returned by the related SMC command. Add SoC compatible to cpufreq-dt-plat block list as a dedicated cpufreq driver is needed with OPP v2 nodes declared in DTS. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> --- Changes v4: - Rework to clk-only + PM set_performance_state implementation Changes v3: - Adapt to new cpufreq-dt APIs - Register cpufreq-dt instead of custom freq driver Changes v2: - Fix kernel bot error with missing slab.h and bitfield.h header - Limit COMPILE_TEST to ARM64 due to smcc 1.2 drivers/cpufreq/Kconfig.arm | 9 ++ drivers/cpufreq/Makefile | 1 + drivers/cpufreq/airoha-cpufreq.c | 222 +++++++++++++++++++++++++++ drivers/cpufreq/cpufreq-dt-platdev.c | 2 + 4 files changed, 234 insertions(+) create mode 100644 drivers/cpufreq/airoha-cpufreq.c