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Subject[v8] clk: qcom: clk-rpmh: Add QCOM RPMh clock driver
Date
Add the RPMh clock driver to control the RPMh managed clock resources on
some of the Qualcomm Technologies, Inc. SoCs.

Signed-off-by: Taniya Das <tdas@codeaurora.org>
---
drivers/clk/qcom/Kconfig | 9 ++
drivers/clk/qcom/Makefile | 1 +
drivers/clk/qcom/clk-rpmh.c | 334 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 344 insertions(+)
create mode 100644 drivers/clk/qcom/clk-rpmh.c

diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
index e42e1af..627e6e1 100644
--- a/drivers/clk/qcom/Kconfig
+++ b/drivers/clk/qcom/Kconfig
@@ -59,6 +59,15 @@ config QCOM_CLK_SMD_RPM
Say Y if you want to support the clocks exposed by the RPM on
platforms such as apq8016, apq8084, msm8974 etc.

+config QCOM_CLK_RPMH
+ tristate "RPMh Clock Driver"
+ depends on COMMON_CLK_QCOM && QCOM_RPMH
+ help
+ RPMh manages shared resources on some Qualcomm Technologies, Inc.
+ SoCs. It accepts requests from other hardware subsystems via RSC.
+ Say Y if you want to support the clocks exposed by RPMh on
+ platforms such as SDM845.
+
config APQ_GCC_8084
tristate "APQ8084 Global Clock Controller"
select QCOM_GDSC
diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
index 7c09ab1..246a721 100644
--- a/drivers/clk/qcom/Makefile
+++ b/drivers/clk/qcom/Makefile
@@ -37,5 +37,6 @@ obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
obj-$(CONFIG_QCOM_A53PLL) += a53-pll.o
obj-$(CONFIG_QCOM_CLK_APCS_MSM8916) += apcs-msm8916.o
obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o
+obj-$(CONFIG_QCOM_CLK_RPMH) += clk-rpmh.o
obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o
obj-$(CONFIG_SPMI_PMIC_CLKDIV) += clk-spmi-pmic-div.o
diff --git a/drivers/clk/qcom/clk-rpmh.c b/drivers/clk/qcom/clk-rpmh.c
new file mode 100644
index 0000000..944fe04
--- /dev/null
+++ b/drivers/clk/qcom/clk-rpmh.c
@@ -0,0 +1,334 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <soc/qcom/cmd-db.h>
+#include <soc/qcom/rpmh.h>
+
+#include <dt-bindings/clock/qcom,rpmh.h>
+
+#define CLK_RPMH_ARC_EN_OFFSET 0
+#define CLK_RPMH_VRM_EN_OFFSET 4
+
+/**
+ * struct clk_rpmh - individual rpmh clock data structure
+ * @hw: handle between common and hardware-specific interfaces
+ * @res_name: resource name for the rpmh clock
+ * @div: clock divider to compute the clock rate
+ * @res_addr: base address of the rpmh resource within the RPMh
+ * @res_on_val: rpmh clock enable value
+ * @state: rpmh clock requested state
+ * @aggr_state: rpmh clock aggregated state
+ * @last_sent_aggr_state: rpmh clock last aggr state sent to RPMh
+ * @valid_state_mask: mask to determine the state of the rpmh clock
+ * @dev: device to which it is attached
+ * @peer: pointer to the clock rpmh sibling
+ */
+struct clk_rpmh {
+ struct clk_hw hw;
+ const char *res_name;
+ u8 div;
+ u32 res_addr;
+ u32 res_on_val;
+ u32 state;
+ u32 aggr_state;
+ u32 last_sent_aggr_state;
+ u32 valid_state_mask;
+ struct device *dev;
+ struct clk_rpmh *peer;
+};
+
+struct clk_rpmh_desc {
+ struct clk_hw **clks;
+ size_t num_clks;
+};
+
+static DEFINE_MUTEX(rpmh_clk_lock);
+
+#define __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
+ _res_en_offset, _res_on, _div) \
+ static struct clk_rpmh _platform##_##_name_active; \
+ static struct clk_rpmh _platform##_##_name = { \
+ .res_name = _res_name, \
+ .res_addr = _res_en_offset, \
+ .res_on_val = _res_on, \
+ .div = _div, \
+ .peer = &_platform##_##_name_active, \
+ .valid_state_mask = (BIT(RPMH_WAKE_ONLY_STATE) | \
+ BIT(RPMH_ACTIVE_ONLY_STATE) | \
+ BIT(RPMH_SLEEP_STATE)), \
+ .hw.init = &(struct clk_init_data){ \
+ .ops = &clk_rpmh_ops, \
+ .name = #_name, \
+ .parent_names = (const char *[]){ "xo_board" }, \
+ .num_parents = 1, \
+ }, \
+ }; \
+ static struct clk_rpmh _platform##_##_name_active = { \
+ .res_name = _res_name, \
+ .res_addr = _res_en_offset, \
+ .res_on_val = _res_on, \
+ .div = _div, \
+ .peer = &_platform##_##_name, \
+ .valid_state_mask = (BIT(RPMH_WAKE_ONLY_STATE) | \
+ BIT(RPMH_ACTIVE_ONLY_STATE)), \
+ .hw.init = &(struct clk_init_data){ \
+ .ops = &clk_rpmh_ops, \
+ .name = #_name_active, \
+ .parent_names = (const char *[]){ "xo_board" }, \
+ .num_parents = 1, \
+ }, \
+ }
+
+#define DEFINE_CLK_RPMH_ARC(_platform, _name, _name_active, _res_name, \
+ _res_on, _div) \
+ __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
+ CLK_RPMH_ARC_EN_OFFSET, _res_on, _div)
+
+#define DEFINE_CLK_RPMH_VRM(_platform, _name, _name_active, _res_name, \
+ _div) \
+ __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
+ CLK_RPMH_VRM_EN_OFFSET, 1, _div)
+
+static inline struct clk_rpmh *to_clk_rpmh(struct clk_hw *_hw)
+{
+ return container_of(_hw, struct clk_rpmh, hw);
+}
+
+static inline bool has_state_changed(struct clk_rpmh *c, u32 state)
+{
+ return (c->last_sent_aggr_state & BIT(state))
+ != (c->aggr_state & BIT(state));
+}
+
+static int clk_rpmh_send_aggregate_command(struct clk_rpmh *c)
+{
+ struct tcs_cmd cmd = { 0 };
+ u32 cmd_state, on_val;
+ enum rpmh_state state = RPMH_SLEEP_STATE;
+ int ret;
+
+ cmd.addr = c->res_addr;
+ cmd_state = c->aggr_state;
+ on_val = c->res_on_val;
+
+ for (; state <= RPMH_ACTIVE_ONLY_STATE; state++) {
+ if (has_state_changed(c, state)) {
+ if (cmd_state & BIT(state))
+ cmd.data = on_val;
+
+ ret = rpmh_write_async(c->dev, state, &cmd, 1);
+ if (ret) {
+ dev_err(c->dev, "set %s state of %s failed: (%d)\n",
+ !state ? "sleep" :
+ state == RPMH_WAKE_ONLY_STATE ?
+ "wake" : "active", c->res_name, ret);
+ return ret;
+ }
+ }
+ }
+
+ c->last_sent_aggr_state = c->aggr_state;
+ c->peer->last_sent_aggr_state = c->last_sent_aggr_state;
+
+ return 0;
+}
+
+/*
+ * Update state and aggregate state values based on enable value.
+ */
+static int clk_rpmh_aggregate_state_send_command(struct clk_rpmh *c,
+ bool enable)
+{
+ int ret;
+
+ /* Nothing required to be done if already off or on */
+ if (enable == c->state)
+ return 0;
+
+ c->state = enable ? c->valid_state_mask : 0;
+ c->aggr_state = c->state | c->peer->state;
+ c->peer->aggr_state = c->aggr_state;
+
+ ret = clk_rpmh_send_aggregate_command(c);
+ if (!ret)
+ return 0;
+ if (ret && enable)
+ c->state = 0;
+ else if (ret)
+ c->state = c->valid_state_mask;
+
+ WARN(1, "clk: %s failed to %s\n", c->res_name,
+ enable ? "enable" : "disable");
+ return ret;
+}
+
+static int clk_rpmh_prepare(struct clk_hw *hw)
+{
+ struct clk_rpmh *c = to_clk_rpmh(hw);
+ int ret = 0;
+
+ mutex_lock(&rpmh_clk_lock);
+ ret = clk_rpmh_aggregate_state_send_command(c, true);
+ mutex_unlock(&rpmh_clk_lock);
+
+ return ret;
+};
+
+static void clk_rpmh_unprepare(struct clk_hw *hw)
+{
+ struct clk_rpmh *c = to_clk_rpmh(hw);
+
+ mutex_lock(&rpmh_clk_lock);
+ clk_rpmh_aggregate_state_send_command(c, false);
+ mutex_unlock(&rpmh_clk_lock);
+};
+
+static unsigned long clk_rpmh_recalc_rate(struct clk_hw *hw,
+ unsigned long prate)
+{
+ struct clk_rpmh *r = to_clk_rpmh(hw);
+ unsigned long rate = prate;
+
+ /*
+ * RPMh clocks have a fixed rate. Return static rate.
+ */
+ do_div(rate, r->div);
+ return rate;
+}
+
+static const struct clk_ops clk_rpmh_ops = {
+ .prepare = clk_rpmh_prepare,
+ .unprepare = clk_rpmh_unprepare,
+ .recalc_rate = clk_rpmh_recalc_rate,
+};
+
+/* Resource name must match resource id present in cmd-db. */
+DEFINE_CLK_RPMH_ARC(sdm845, bi_tcxo, bi_tcxo_ao, "xo.lvl", 0x3, 2);
+DEFINE_CLK_RPMH_VRM(sdm845, ln_bb_clk2, ln_bb_clk2_ao, "lnbclka2", 2);
+DEFINE_CLK_RPMH_VRM(sdm845, ln_bb_clk3, ln_bb_clk3_ao, "lnbclka3", 2);
+DEFINE_CLK_RPMH_VRM(sdm845, rf_clk1, rf_clk1_ao, "rfclka1", 1);
+DEFINE_CLK_RPMH_VRM(sdm845, rf_clk2, rf_clk2_ao, "rfclka2", 1);
+DEFINE_CLK_RPMH_VRM(sdm845, rf_clk3, rf_clk3_ao, "rfclka3", 1);
+
+static struct clk_hw *sdm845_rpmh_clocks[] = {
+ [RPMH_CXO_CLK] = &sdm845_bi_tcxo.hw,
+ [RPMH_CXO_CLK_A] = &sdm845_bi_tcxo_ao.hw,
+ [RPMH_LN_BB_CLK2] = &sdm845_ln_bb_clk2.hw,
+ [RPMH_LN_BB_CLK2_A] = &sdm845_ln_bb_clk2_ao.hw,
+ [RPMH_LN_BB_CLK3] = &sdm845_ln_bb_clk3.hw,
+ [RPMH_LN_BB_CLK3_A] = &sdm845_ln_bb_clk3_ao.hw,
+ [RPMH_RF_CLK1] = &sdm845_rf_clk1.hw,
+ [RPMH_RF_CLK1_A] = &sdm845_rf_clk1_ao.hw,
+ [RPMH_RF_CLK2] = &sdm845_rf_clk2.hw,
+ [RPMH_RF_CLK2_A] = &sdm845_rf_clk2_ao.hw,
+ [RPMH_RF_CLK3] = &sdm845_rf_clk3.hw,
+ [RPMH_RF_CLK3_A] = &sdm845_rf_clk3_ao.hw,
+};
+
+static const struct clk_rpmh_desc clk_rpmh_sdm845 = {
+ .clks = sdm845_rpmh_clocks,
+ .num_clks = ARRAY_SIZE(sdm845_rpmh_clocks),
+};
+
+static struct clk_hw *of_clk_rpmh_hw_get(struct of_phandle_args *clkspec,
+ void *data)
+{
+ struct clk_hw *hw_clks = data;
+ unsigned int idx = clkspec->args[0];
+
+ if (idx < 0) {
+ pr_err("%s: invalid index %u\n", __func__, idx);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return &hw_clks[idx];
+}
+
+static int clk_rpmh_probe(struct platform_device *pdev)
+{
+ struct clk_hw **hw_clks;
+ struct clk_rpmh *rpmh_clk;
+ const struct clk_rpmh_desc *desc;
+ int ret, i;
+
+ ret = cmd_db_ready();
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Command DB not available (%d)\n",
+ ret);
+ return ret;
+ }
+
+ desc = of_device_get_match_data(&pdev->dev);
+ hw_clks = desc->clks;
+
+ for (i = 0; i < desc->num_clks; i++) {
+ u32 res_addr;
+
+ rpmh_clk = to_clk_rpmh(hw_clks[i]);
+ res_addr = cmd_db_read_addr(rpmh_clk->res_name);
+ if (!res_addr) {
+ dev_err(&pdev->dev, "missing RPMh resource address for %s\n",
+ rpmh_clk->res_name);
+ return -ENODEV;
+ }
+ rpmh_clk->res_addr += res_addr;
+ rpmh_clk->dev = &pdev->dev;
+
+ ret = devm_clk_hw_register(&pdev->dev, hw_clks[i]);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register %s\n",
+ hw_clks[i]->init->name);
+ return ret;
+ }
+ }
+
+ ret = devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rpmh_hw_get,
+ desc->clks);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add clock provider\n");
+ return ret;
+ }
+
+ dev_dbg(&pdev->dev, "Registered RPMh clocks\n");
+
+ return 0;
+}
+
+static const struct of_device_id clk_rpmh_match_table[] = {
+ { .compatible = "qcom,sdm845-rpmh-clk", .data = &clk_rpmh_sdm845},
+ { }
+};
+MODULE_DEVICE_TABLE(of, clk_rpmh_match_table);
+
+static struct platform_driver clk_rpmh_driver = {
+ .probe = clk_rpmh_probe,
+ .driver = {
+ .name = "clk-rpmh",
+ .of_match_table = clk_rpmh_match_table,
+ },
+};
+
+static int __init clk_rpmh_init(void)
+{
+ return platform_driver_register(&clk_rpmh_driver);
+}
+subsys_initcall(clk_rpmh_init);
+
+static void __exit clk_rpmh_exit(void)
+{
+ platform_driver_unregister(&clk_rpmh_driver);
+}
+module_exit(clk_rpmh_exit);
+
+MODULE_DESCRIPTION("QCOM RPMh Clock Driver");
+MODULE_LICENSE("GPL v2");
--
Qualcomm INDIA, on behalf of Qualcomm Innovation Center, Inc.is a member
of the Code Aurora Forum, hosted by the Linux Foundation.
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