Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 353 insertions, 0 deletions

diff --git a/drivers/cpufreq/apple-soc-cpufreq.c b/drivers/cpufreq/apple-soc-cpufreq.c
new file mode 100644
index 0000000000..021f423705
--- /dev/null
+++ b/drivers/cpufreq/apple-soc-cpufreq.c
@@ -0,0 +1,353 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple SoC CPU cluster performance state driver
+ *
+ * Copyright The Asahi Linux Contributors
+ *
+ * Based on scpi-cpufreq.c
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/cpumask.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/pm_opp.h>
+#include <linux/slab.h>
+
+#define APPLE_DVFS_CMD			0x20
+#define APPLE_DVFS_CMD_BUSY		BIT(31)
+#define APPLE_DVFS_CMD_SET		BIT(25)
+#define APPLE_DVFS_CMD_PS2		GENMASK(16, 12)
+#define APPLE_DVFS_CMD_PS1		GENMASK(4, 0)
+
+/* Same timebase as CPU counter (24MHz) */
+#define APPLE_DVFS_LAST_CHG_TIME	0x38
+
+/*
+ * Apple ran out of bits and had to shift this in T8112...
+ */
+#define APPLE_DVFS_STATUS			0x50
+#define APPLE_DVFS_STATUS_CUR_PS_T8103		GENMASK(7, 4)
+#define APPLE_DVFS_STATUS_CUR_PS_SHIFT_T8103	4
+#define APPLE_DVFS_STATUS_TGT_PS_T8103		GENMASK(3, 0)
+#define APPLE_DVFS_STATUS_CUR_PS_T8112		GENMASK(9, 5)
+#define APPLE_DVFS_STATUS_CUR_PS_SHIFT_T8112	5
+#define APPLE_DVFS_STATUS_TGT_PS_T8112		GENMASK(4, 0)
+
+/*
+ * Div is +1, base clock is 12MHz on existing SoCs.
+ * For documentation purposes. We use the OPP table to
+ * get the frequency.
+ */
+#define APPLE_DVFS_PLL_STATUS		0xc0
+#define APPLE_DVFS_PLL_FACTOR		0xc8
+#define APPLE_DVFS_PLL_FACTOR_MULT	GENMASK(31, 16)
+#define APPLE_DVFS_PLL_FACTOR_DIV	GENMASK(15, 0)
+
+#define APPLE_DVFS_TRANSITION_TIMEOUT 100
+
+struct apple_soc_cpufreq_info {
+	u64 max_pstate;
+	u64 cur_pstate_mask;
+	u64 cur_pstate_shift;
+};
+
+struct apple_cpu_priv {
+	struct device *cpu_dev;
+	void __iomem *reg_base;
+	const struct apple_soc_cpufreq_info *info;
+};
+
+static struct cpufreq_driver apple_soc_cpufreq_driver;
+
+static const struct apple_soc_cpufreq_info soc_t8103_info = {
+	.max_pstate = 15,
+	.cur_pstate_mask = APPLE_DVFS_STATUS_CUR_PS_T8103,
+	.cur_pstate_shift = APPLE_DVFS_STATUS_CUR_PS_SHIFT_T8103,
+};
+
+static const struct apple_soc_cpufreq_info soc_t8112_info = {
+	.max_pstate = 31,
+	.cur_pstate_mask = APPLE_DVFS_STATUS_CUR_PS_T8112,
+	.cur_pstate_shift = APPLE_DVFS_STATUS_CUR_PS_SHIFT_T8112,
+};
+
+static const struct apple_soc_cpufreq_info soc_default_info = {
+	.max_pstate = 15,
+	.cur_pstate_mask = 0, /* fallback */
+};
+
+static const struct of_device_id apple_soc_cpufreq_of_match[] = {
+	{
+		.compatible = "apple,t8103-cluster-cpufreq",
+		.data = &soc_t8103_info,
+	},
+	{
+		.compatible = "apple,t8112-cluster-cpufreq",
+		.data = &soc_t8112_info,
+	},
+	{
+		.compatible = "apple,cluster-cpufreq",
+		.data = &soc_default_info,
+	},
+	{}
+};
+
+static unsigned int apple_soc_cpufreq_get_rate(unsigned int cpu)
+{
+	struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
+	struct apple_cpu_priv *priv = policy->driver_data;
+	struct cpufreq_frequency_table *p;
+	unsigned int pstate;
+
+	if (priv->info->cur_pstate_mask) {
+		u64 reg = readq_relaxed(priv->reg_base + APPLE_DVFS_STATUS);
+
+		pstate = (reg & priv->info->cur_pstate_mask) >>  priv->info->cur_pstate_shift;
+	} else {
+		/*
+		 * For the fallback case we might not know the layout of DVFS_STATUS,
+		 * so just use the command register value (which ignores boost limitations).
+		 */
+		u64 reg = readq_relaxed(priv->reg_base + APPLE_DVFS_CMD);
+
+		pstate = FIELD_GET(APPLE_DVFS_CMD_PS1, reg);
+	}
+
+	cpufreq_for_each_valid_entry(p, policy->freq_table)
+		if (p->driver_data == pstate)
+			return p->frequency;
+
+	dev_err(priv->cpu_dev, "could not find frequency for pstate %d\n",
+		pstate);
+	return 0;
+}
+
+static int apple_soc_cpufreq_set_target(struct cpufreq_policy *policy,
+					unsigned int index)
+{
+	struct apple_cpu_priv *priv = policy->driver_data;
+	unsigned int pstate = policy->freq_table[index].driver_data;
+	u64 reg;
+
+	/* Fallback for newer SoCs */
+	if (index > priv->info->max_pstate)
+		index = priv->info->max_pstate;
+
+	if (readq_poll_timeout_atomic(priv->reg_base + APPLE_DVFS_CMD, reg,
+				      !(reg & APPLE_DVFS_CMD_BUSY), 2,
+				      APPLE_DVFS_TRANSITION_TIMEOUT)) {
+		return -EIO;
+	}
+
+	reg &= ~(APPLE_DVFS_CMD_PS1 | APPLE_DVFS_CMD_PS2);
+	reg |= FIELD_PREP(APPLE_DVFS_CMD_PS1, pstate);
+	reg |= FIELD_PREP(APPLE_DVFS_CMD_PS2, pstate);
+	reg |= APPLE_DVFS_CMD_SET;
+
+	writeq_relaxed(reg, priv->reg_base + APPLE_DVFS_CMD);
+
+	return 0;
+}
+
+static unsigned int apple_soc_cpufreq_fast_switch(struct cpufreq_policy *policy,
+						  unsigned int target_freq)
+{
+	if (apple_soc_cpufreq_set_target(policy, policy->cached_resolved_idx) < 0)
+		return 0;
+
+	return policy->freq_table[policy->cached_resolved_idx].frequency;
+}
+
+static int apple_soc_cpufreq_find_cluster(struct cpufreq_policy *policy,
+					  void __iomem **reg_base,
+					  const struct apple_soc_cpufreq_info **info)
+{
+	struct of_phandle_args args;
+	const struct of_device_id *match;
+	int ret = 0;
+
+	ret = of_perf_domain_get_sharing_cpumask(policy->cpu, "performance-domains",
+						 "#performance-domain-cells",
+						 policy->cpus, &args);
+	if (ret < 0)
+		return ret;
+
+	match = of_match_node(apple_soc_cpufreq_of_match, args.np);
+	of_node_put(args.np);
+	if (!match)
+		return -ENODEV;
+
+	*info = match->data;
+
+	*reg_base = of_iomap(args.np, 0);
+	if (!*reg_base)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static struct freq_attr *apple_soc_cpufreq_hw_attr[] = {
+	&cpufreq_freq_attr_scaling_available_freqs,
+	NULL, /* Filled in below if boost is enabled */
+	NULL,
+};
+
+static int apple_soc_cpufreq_init(struct cpufreq_policy *policy)
+{
+	int ret, i;
+	unsigned int transition_latency;
+	void __iomem *reg_base;
+	struct device *cpu_dev;
+	struct apple_cpu_priv *priv;
+	const struct apple_soc_cpufreq_info *info;
+	struct cpufreq_frequency_table *freq_table;
+
+	cpu_dev = get_cpu_device(policy->cpu);
+	if (!cpu_dev) {
+		pr_err("failed to get cpu%d device\n", policy->cpu);
+		return -ENODEV;
+	}
+
+	ret = dev_pm_opp_of_add_table(cpu_dev);
+	if (ret < 0) {
+		dev_err(cpu_dev, "%s: failed to add OPP table: %d\n", __func__, ret);
+		return ret;
+	}
+
+	ret = apple_soc_cpufreq_find_cluster(policy, &reg_base, &info);
+	if (ret) {
+		dev_err(cpu_dev, "%s: failed to get cluster info: %d\n", __func__, ret);
+		return ret;
+	}
+
+	ret = dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
+	if (ret) {
+		dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n", __func__, ret);
+		goto out_iounmap;
+	}
+
+	ret = dev_pm_opp_get_opp_count(cpu_dev);
+	if (ret <= 0) {
+		dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
+		ret = -EPROBE_DEFER;
+		goto out_free_opp;
+	}
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		ret = -ENOMEM;
+		goto out_free_opp;
+	}
+
+	ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
+	if (ret) {
+		dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret);
+		goto out_free_priv;
+	}
+
+	/* Get OPP levels (p-state indexes) and stash them in driver_data */
+	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
+		unsigned long rate = freq_table[i].frequency * 1000 + 999;
+		struct dev_pm_opp *opp = dev_pm_opp_find_freq_floor(cpu_dev, &rate);
+
+		if (IS_ERR(opp)) {
+			ret = PTR_ERR(opp);
+			goto out_free_cpufreq_table;
+		}
+		freq_table[i].driver_data = dev_pm_opp_get_level(opp);
+		dev_pm_opp_put(opp);
+	}
+
+	priv->cpu_dev = cpu_dev;
+	priv->reg_base = reg_base;
+	priv->info = info;
+	policy->driver_data = priv;
+	policy->freq_table = freq_table;
+
+	transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev);
+	if (!transition_latency)
+		transition_latency = CPUFREQ_ETERNAL;
+
+	policy->cpuinfo.transition_latency = transition_latency;
+	policy->dvfs_possible_from_any_cpu = true;
+	policy->fast_switch_possible = true;
+	policy->suspend_freq = freq_table[0].frequency;
+
+	if (policy_has_boost_freq(policy)) {
+		ret = cpufreq_enable_boost_support();
+		if (ret) {
+			dev_warn(cpu_dev, "failed to enable boost: %d\n", ret);
+		} else {
+			apple_soc_cpufreq_hw_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs;
+			apple_soc_cpufreq_driver.boost_enabled = true;
+		}
+	}
+
+	return 0;
+
+out_free_cpufreq_table:
+	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
+out_free_priv:
+	kfree(priv);
+out_free_opp:
+	dev_pm_opp_remove_all_dynamic(cpu_dev);
+out_iounmap:
+	iounmap(reg_base);
+	return ret;
+}
+
+static int apple_soc_cpufreq_exit(struct cpufreq_policy *policy)
+{
+	struct apple_cpu_priv *priv = policy->driver_data;
+
+	dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
+	dev_pm_opp_remove_all_dynamic(priv->cpu_dev);
+	iounmap(priv->reg_base);
+	kfree(priv);
+
+	return 0;
+}
+
+static struct cpufreq_driver apple_soc_cpufreq_driver = {
+	.name		= "apple-cpufreq",
+	.flags		= CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
+			  CPUFREQ_NEED_INITIAL_FREQ_CHECK | CPUFREQ_IS_COOLING_DEV,
+	.verify		= cpufreq_generic_frequency_table_verify,
+	.get		= apple_soc_cpufreq_get_rate,
+	.init		= apple_soc_cpufreq_init,
+	.exit		= apple_soc_cpufreq_exit,
+	.target_index	= apple_soc_cpufreq_set_target,
+	.fast_switch	= apple_soc_cpufreq_fast_switch,
+	.register_em	= cpufreq_register_em_with_opp,
+	.attr		= apple_soc_cpufreq_hw_attr,
+	.suspend	= cpufreq_generic_suspend,
+};
+
+static int __init apple_soc_cpufreq_module_init(void)
+{
+	if (!of_machine_is_compatible("apple,arm-platform"))
+		return -ENODEV;
+
+	return cpufreq_register_driver(&apple_soc_cpufreq_driver);
+}
+module_init(apple_soc_cpufreq_module_init);
+
+static void __exit apple_soc_cpufreq_module_exit(void)
+{
+	cpufreq_unregister_driver(&apple_soc_cpufreq_driver);
+}
+module_exit(apple_soc_cpufreq_module_exit);
+
+MODULE_DEVICE_TABLE(of, apple_soc_cpufreq_of_match);
+MODULE_AUTHOR("Hector Martin <marcan@marcan.st>");
+MODULE_DESCRIPTION("Apple SoC CPU cluster DVFS driver");
+MODULE_LICENSE("GPL");