[PATCH 1/2] clk: qcom: clk-rpmh: Add QCOM RPMh clock driver

Taniya Das
2018-03-29T06:18:59Z

From: Amit Nischal <anischal@codeaurora.org>

Add the RPMh clock driver to control the RPMh managed clock resources on
some of the Qualcomm Technologies, Inc. SoCs.

Signed-off-by: David Collins <collinsd@codeaurora.org>
Signed-off-by: Amit Nischal <anischal@codeaurora.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>
---
drivers/clk/qcom/Kconfig | 9 +
drivers/clk/qcom/Makefile | 1 +
drivers/clk/qcom/clk-rpmh.c | 397 ++++++++++++++++++++++++++++++++++
include/dt-bindings/clock/qcom,rpmh.h | 25 +++
4 files changed, 432 insertions(+)
create mode 100644 drivers/clk/qcom/clk-rpmh.c
create mode 100644 include/dt-bindings/clock/qcom,rpmh.h

diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
index fbf4532..3697a6a 100644
--- a/drivers/clk/qcom/Kconfig
+++ b/drivers/clk/qcom/Kconfig
@@ -112,6 +112,15 @@ config IPQ_GCC_8074
i2c, USB, SD/eMMC, etc. Select this for the root clock
of ipq8074.

+config MSM_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 MSM_GCC_8660
tristate "MSM8660 Global Clock Controller"
depends on COMMON_CLK_QCOM
diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
index 230332c..b7da05b 100644
--- a/drivers/clk/qcom/Makefile
+++ b/drivers/clk/qcom/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_IPQ_GCC_8074) += gcc-ipq8074.o
obj-$(CONFIG_IPQ_LCC_806X) += lcc-ipq806x.o
obj-$(CONFIG_MDM_GCC_9615) += gcc-mdm9615.o
obj-$(CONFIG_MDM_LCC_9615) += lcc-mdm9615.o
+obj-$(CONFIG_MSM_CLK_RPMH) += clk-rpmh.o
obj-$(CONFIG_MSM_GCC_8660) += gcc-msm8660.o
obj-$(CONFIG_MSM_GCC_8916) += gcc-msm8916.o
obj-$(CONFIG_MSM_GCC_8960) += gcc-msm8960.o
diff --git a/drivers/clk/qcom/clk-rpmh.c b/drivers/clk/qcom/clk-rpmh.c
new file mode 100644
index 0000000..536d102
--- /dev/null
+++ b/drivers/clk/qcom/clk-rpmh.c
@@ -0,0 +1,397 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+#include <soc/qcom/cmd-db.h>
+#include <soc/qcom/rpmh.h>
+#include <dt-bindings/clock/qcom,rpmh.h>
+
+#include "common.h"
+#include "clk-regmap.h"
+
+#define CLK_RPMH_ARC_EN_OFFSET 0
+#define CLK_RPMH_VRM_EN_OFFSET 4
+#define CLK_RPMH_VRM_OFF_VAL 0
+#define CLK_RPMH_VRM_ON_VAL 1
+#define CLK_RPMH_APPS_RSC_AO_STATE_MASK (BIT(RPMH_WAKE_ONLY_STATE) | \
+ BIT(RPMH_ACTIVE_ONLY_STATE))
+#define CLK_RPMH_APPS_RSC_STATE_MASK (BIT(RPMH_WAKE_ONLY_STATE) | \
+ BIT(RPMH_ACTIVE_ONLY_STATE) | \
+ BIT(RPMH_SLEEP_STATE))
+struct clk_rpmh {
+ const char *res_name;
+ u32 res_addr;
+ u32 res_en_offset;
+ u32 res_on_val;
+ u32 res_off_val;
+ u32 state;
+ u32 aggr_state;
+ u32 last_sent_aggr_state;
+ u32 valid_state_mask;
+ struct rpmh_client *rpmh_client;
+ unsigned long rate;
+ struct clk_rpmh *peer;
+ struct clk_hw hw;
+};
+
+struct rpmh_cc {
+ struct clk_onecell_data data;
+ struct clk *clks[];
+};
+
+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, _res_off, _rate, \
+ _state_mask, _state_on_mask) \
+ static struct clk_rpmh _platform##_##_name_active; \
+ static struct clk_rpmh _platform##_##_name = { \
+ .res_name = _res_name, \
+ .res_en_offset = _res_en_offset, \
+ .res_on_val = _res_on, \
+ .res_off_val = _res_off, \
+ .rate = _rate, \
+ .peer = &_platform##_##_name_active, \
+ .valid_state_mask = _state_mask, \
+ .hw.init = &(struct clk_init_data){ \
+ .ops = &clk_rpmh_ops, \
+ .name = #_name, \
+ }, \
+ }; \
+ static struct clk_rpmh _platform##_##_name_active = { \
+ .res_name = _res_name, \
+ .res_en_offset = _res_en_offset, \
+ .res_on_val = _res_on, \
+ .res_off_val = _res_off, \
+ .rate = _rate, \
+ .peer = &_platform##_##_name, \
+ .valid_state_mask = _state_on_mask, \
+ .hw.init = &(struct clk_init_data){ \
+ .ops = &clk_rpmh_ops, \
+ .name = #_name_active, \
+ }, \
+ }
+
+#define DEFINE_CLK_RPMH_ARC(_platform, _name, _name_active, _res_name, \
+ _res_on, _res_off, _rate, _state_mask, \
+ _state_on_mask) \
+ __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
+ CLK_RPMH_ARC_EN_OFFSET, _res_on, _res_off, \
+ _rate, _state_mask, _state_on_mask)
+
+#define DEFINE_CLK_RPMH_VRM(_platform, _name, _name_active, _res_name, \
+ _rate, _state_mask, _state_on_mask) \
+ __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \
+ CLK_RPMH_VRM_EN_OFFSET, CLK_RPMH_VRM_ON_VAL, \
+ CLK_RPMH_VRM_OFF_VAL, _rate, _state_mask, \
+ _state_on_mask)
+
+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 };
+ int ret = 0;
+
+ cmd.addr = c->res_addr + c->res_en_offset;
+
+ if (has_state_changed(c, RPMH_SLEEP_STATE)) {
+ cmd.data = (c->aggr_state >> RPMH_SLEEP_STATE) & 1
+ ? c->res_on_val : c->res_off_val;
+ ret = rpmh_write_async(c->rpmh_client, RPMH_SLEEP_STATE,
+ &cmd, 1);
+ if (ret) {
+ pr_err("rpmh_write_async(%s, state=%d) failed (%d)\n",
+ c->res_name, RPMH_SLEEP_STATE, ret);
+ return ret;
+ }
+ }
+
+ if (has_state_changed(c, RPMH_WAKE_ONLY_STATE)) {
+ cmd.data = (c->aggr_state >> RPMH_WAKE_ONLY_STATE) & 1
+ ? c->res_on_val : c->res_off_val;
+ ret = rpmh_write_async(c->rpmh_client,
+ RPMH_WAKE_ONLY_STATE, &cmd, 1);
+ if (ret) {
+ pr_err("rpmh_write_async(%s, state=%d) failed (%d)\n",
+ c->res_name, RPMH_WAKE_ONLY_STATE, ret);
+ return ret;
+ }
+ }
+
+ if (has_state_changed(c, RPMH_ACTIVE_ONLY_STATE)) {
+ cmd.data = (c->aggr_state >> RPMH_ACTIVE_ONLY_STATE) & 1
+ ? c->res_on_val : c->res_off_val;
+ ret = rpmh_write(c->rpmh_client, RPMH_ACTIVE_ONLY_STATE,
+ &cmd, 1);
+ if (ret) {
+ pr_err("rpmh_write(%s, state=%d) failed (%d)\n",
+ c->res_name, RPMH_ACTIVE_ONLY_STATE, ret);
+ return ret;
+ }
+ }
+
+ c->last_sent_aggr_state = c->aggr_state;
+ c->peer->last_sent_aggr_state = c->last_sent_aggr_state;
+
+ return 0;
+}
+
+static void clk_rpmh_aggregate_state(struct clk_rpmh *c, bool enable)
+{
+ /* Update state and aggregate state values based on enable value. */
+ c->state = enable ? c->valid_state_mask : 0;
+ c->aggr_state = c->state | c->peer->state;
+ c->peer->aggr_state = c->aggr_state;
+}
+
+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);
+
+ if (c->state)
+ goto out;
+
+ clk_rpmh_aggregate_state(c, true);
+
+ ret = clk_rpmh_send_aggregate_command(c);
+
+ if (ret)
+ c->state = 0;
+
+out:
+ mutex_unlock(&rpmh_clk_lock);
+ return ret;
+};
+
+static void clk_rpmh_unprepare(struct clk_hw *hw)
+{
+ struct clk_rpmh *c = to_clk_rpmh(hw);
+ int ret = 0;
+
+ mutex_lock(&rpmh_clk_lock);
+
+ if (!c->state)
+ goto out;
+
+ clk_rpmh_aggregate_state(c, false);
+
+ ret = clk_rpmh_send_aggregate_command(c);
+
+ if (ret) {
+ c->state = c->valid_state_mask;
+ WARN(1, "clk: %s failed to disable\n", c->res_name);
+ }
+
+out:
+ mutex_unlock(&rpmh_clk_lock);
+ return;
+};
+
+static unsigned long clk_rpmh_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_rpmh *r = to_clk_rpmh(hw);
+
+ /*
+ * RPMh clocks have a fixed rate. Return static rate set
+ * at init time.
+ */
+ return r->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, 0x0,
+ 19200000, CLK_RPMH_APPS_RSC_STATE_MASK,
+ CLK_RPMH_APPS_RSC_AO_STATE_MASK);
+DEFINE_CLK_RPMH_VRM(sdm845, ln_bb_clk2, ln_bb_clk2_ao, "lnbclka2",
+ 19200000, CLK_RPMH_APPS_RSC_STATE_MASK,
+ CLK_RPMH_APPS_RSC_AO_STATE_MASK);
+DEFINE_CLK_RPMH_VRM(sdm845, ln_bb_clk3, ln_bb_clk3_ao, "lnbclka3",
+ 19200000, CLK_RPMH_APPS_RSC_STATE_MASK,
+ CLK_RPMH_APPS_RSC_AO_STATE_MASK);
+DEFINE_CLK_RPMH_VRM(sdm845, rf_clk1, rf_clk1_ao, "rfclka1",
+ 38400000, CLK_RPMH_APPS_RSC_STATE_MASK,
+ CLK_RPMH_APPS_RSC_AO_STATE_MASK);
+DEFINE_CLK_RPMH_VRM(sdm845, rf_clk2, rf_clk2_ao, "rfclka2",
+ 38400000, CLK_RPMH_APPS_RSC_STATE_MASK,
+ CLK_RPMH_APPS_RSC_AO_STATE_MASK);
+DEFINE_CLK_RPMH_VRM(sdm845, rf_clk3, rf_clk3_ao, "rfclka3",
+ 38400000, CLK_RPMH_APPS_RSC_STATE_MASK,
+ CLK_RPMH_APPS_RSC_AO_STATE_MASK);
+
+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 const struct of_device_id clk_rpmh_match_table[] = {
+ { .compatible = "qcom,rpmh-clk-sdm845", .data = &clk_rpmh_sdm845},
+ { }
+};
+MODULE_DEVICE_TABLE(of, clk_rpmh_match_table);
+
+static int clk_rpmh_probe(struct platform_device *pdev)
+{
+ struct clk **clks;
+ struct clk *clk;
+ struct rpmh_cc *rcc;
+ struct clk_onecell_data *data;
+ int ret;
+ size_t num_clks, i;
+ struct clk_hw **hw_clks;
+ struct clk_rpmh *rpmh_clk;
+ const struct clk_rpmh_desc *desc;
+ struct property *prop;
+ struct rpmh_client *rpmh_client = NULL;
+
+ desc = of_device_get_match_data(&pdev->dev);
+ if (!desc) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ ret = cmd_db_ready();
+ if (ret) {
+ if (ret != -EPROBE_DEFER) {
+ dev_err(&pdev->dev, "Command DB not available (%d)\n",
+ ret);
+ goto err;
+ }
+ return ret;
+ }
+
+ rpmh_client = rpmh_get_client(pdev);
+ if (IS_ERR(rpmh_client)) {
+ ret = PTR_ERR(rpmh_client);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "failed to request RPMh client, ret=%d\n",
+ ret);
+ return ret;
+ }
+
+ hw_clks = desc->clks;
+ num_clks = desc->num_clks;
+
+ rcc = devm_kzalloc(&pdev->dev, sizeof(*rcc) + sizeof(*clks) * num_clks,
+ GFP_KERNEL);
+ if (!rcc) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ clks = rcc->clks;
+ data = &rcc->data;
+ data->clks = clks;
+ data->clk_num = num_clks;
+
+ for (i = 0; i < num_clks; i++) {
+ rpmh_clk = to_clk_rpmh(hw_clks[i]);
+ rpmh_clk->res_addr = cmd_db_read_addr(rpmh_clk->res_name);
+ if (!rpmh_clk->res_addr) {
+ dev_err(&pdev->dev, "missing RPMh resource address for %s\n",
+ rpmh_clk->res_name);
+ ret = -ENODEV;
+ goto err;
+ }
+
+ rpmh_clk->rpmh_client = rpmh_client;
+
+ clk = devm_clk_register(&pdev->dev, hw_clks[i]);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ goto err;
+ }
+
+ clks[i] = clk;
+ }
+
+ ret = of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get,
+ data);
+ if (ret)
+ goto err;
+
+ dev_info(&pdev->dev, "Registered RPMh clocks\n");
+ return ret;
+
+err:
+ if (rpmh_client)
+ rpmh_release(rpmh_client);
+
+ dev_err(&pdev->dev, "Error registering RPMh Clock driver (%d)\n", ret);
+ return ret;
+}
+
+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("QTI RPMh Clock Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:clk-rpmh");
diff --git a/include/dt-bindings/clock/qcom,rpmh.h b/include/dt-bindings/clock/qcom,rpmh.h
new file mode 100644
index 0000000..34fbf3c
--- /dev/null
+++ b/include/dt-bindings/clock/qcom,rpmh.h
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef _DT_BINDINGS_CLK_MSM_RPMH_H
+#define _DT_BINDINGS_CLK_MSM_RPMH_H
+
+/* RPMh controlled clocks */
+#define RPMH_CXO_CLK 0
+#define RPMH_CXO_CLK_A 1
+#define RPMH_LN_BB_CLK2 2
+#define RPMH_LN_BB_CLK2_A 3
+#define RPMH_LN_BB_CLK3 4
+#define RPMH_LN_BB_CLK3_A 5
+#define RPMH_RF_CLK1 6
+#define RPMH_RF_CLK1_A 7
+#define RPMH_RF_CLK2 8
+#define RPMH_RF_CLK2_A 9
+#define RPMH_RF_CLK3 10
+#define RPMH_RF_CLK3_A 11
+#define RPMH_RF_CLK4 12
+#define RPMH_RF_CLK4_A 13
+
+#endif
--
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