From e7cadf513fe62adae5ef47669c16cd23ac7a1936 Mon Sep 17 00:00:00 2001 From: Georgi Djakov Date: Thu, 14 Apr 2016 17:34:48 +0300 Subject: [PATCH] clk: qcom: Add support for RPM Clocks This adds initial support for clocks controlled by the Resource Power Manager (RPM) processor on some Qualcomm SoCs, which use the qcom_rpm driver to communicate with RPM. Such platforms are apq8064 and msm8960. Signed-off-by: Georgi Djakov --- .../devicetree/bindings/clock/qcom,rpmcc.txt | 1 + drivers/clk/qcom/Kconfig | 13 + drivers/clk/qcom/Makefile | 1 + drivers/clk/qcom/clk-rpm.c | 503 ++++++++++++++++++ include/dt-bindings/clock/qcom,rpmcc.h | 24 + 5 files changed, 542 insertions(+) create mode 100644 drivers/clk/qcom/clk-rpm.c diff --git a/Documentation/devicetree/bindings/clock/qcom,rpmcc.txt b/Documentation/devicetree/bindings/clock/qcom,rpmcc.txt index e3e13226d798..87d3714b956a 100644 --- a/Documentation/devicetree/bindings/clock/qcom,rpmcc.txt +++ b/Documentation/devicetree/bindings/clock/qcom,rpmcc.txt @@ -11,6 +11,7 @@ Required properties : compatible "qcom,rpmcc" should be also included. "qcom,rpmcc-msm8916", "qcom,rpmcc" + "qcom,rpmcc-apq8064", "qcom,rpmcc" - #clock-cells : shall contain 1 diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig index 5692320fe1d8..12fea623c189 100644 --- a/drivers/clk/qcom/Kconfig +++ b/drivers/clk/qcom/Kconfig @@ -12,6 +12,19 @@ config COMMON_CLK_QCOM select REGMAP_MMIO select RESET_CONTROLLER +config QCOM_CLK_RPM + tristate "RPM based Clock Controller" + depends on COMMON_CLK_QCOM && MFD_QCOM_RPM + select QCOM_RPMCC + help + The RPM (Resource Power Manager) is a dedicated hardware engine for + managing the shared SoC resources in order to keep the lowest power + profile. It communicates with other hardware subsystems via shared + memory and accepts clock requests, aggregates the requests and turns + the clocks on/off or scales them on demand. + Say Y if you want to support the clocks exposed by the RPM on + platforms such as apq8064, msm8660, msm8960 etc. + config QCOM_CLK_SMD_RPM tristate "RPM over SMD based Clock Controller" depends on COMMON_CLK_QCOM && QCOM_SMD_RPM diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile index 5b15dc514899..93e127bca238 100644 --- a/drivers/clk/qcom/Makefile +++ b/drivers/clk/qcom/Makefile @@ -30,4 +30,5 @@ obj-$(CONFIG_QCOM_HFPLL) += hfpll.o obj-$(CONFIG_KRAITCC) += krait-cc.o obj-$(CONFIG_QCOM_A53) += clk-a53.o obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o +obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o diff --git a/drivers/clk/qcom/clk-rpm.c b/drivers/clk/qcom/clk-rpm.c new file mode 100644 index 000000000000..05cf83c2ca83 --- /dev/null +++ b/drivers/clk/qcom/clk-rpm.c @@ -0,0 +1,503 @@ +/* + * Copyright (c) 2016, Linaro Limited + * Copyright (c) 2014, The Linux Foundation. All rights reserved. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define QCOM_RPM_MISC_CLK_TYPE 0x306b6c63 +#define QCOM_RPM_SCALING_ENABLE_ID 0x2 + +#define DEFINE_CLK_RPM(_platform, _name, _active, r_id) \ + static struct clk_rpm _platform##_##_active; \ + static struct clk_rpm _platform##_##_name = { \ + .rpm_clk_id = (r_id), \ + .peer = &_platform##_##_active, \ + .rate = INT_MAX, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_rpm_ops, \ + .name = #_name, \ + .parent_names = (const char *[]){ "pxo_board" }, \ + .num_parents = 1, \ + }, \ + }; \ + static struct clk_rpm _platform##_##_active = { \ + .rpm_clk_id = (r_id), \ + .peer = &_platform##_##_name, \ + .active_only = true, \ + .rate = INT_MAX, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_rpm_ops, \ + .name = #_active, \ + .parent_names = (const char *[]){ "pxo_board" }, \ + .num_parents = 1, \ + }, \ + } + +#define DEFINE_CLK_RPM_PXO_BRANCH(_platform, _name, _active, r_id, r) \ + static struct clk_rpm _platform##_##_active; \ + static struct clk_rpm _platform##_##_name = { \ + .rpm_clk_id = (r_id), \ + .active_only = true, \ + .peer = &_platform##_##_active, \ + .rate = (r), \ + .branch = true, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_rpm_branch_ops, \ + .name = #_name, \ + .parent_names = (const char *[]){ "pxo_board" }, \ + .num_parents = 1, \ + }, \ + }; \ + static struct clk_rpm _platform##_##_active = { \ + .rpm_clk_id = (r_id), \ + .peer = &_platform##_##_name, \ + .rate = (r), \ + .branch = true, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_rpm_branch_ops, \ + .name = #_active, \ + .parent_names = (const char *[]){ "pxo_board" }, \ + .num_parents = 1, \ + }, \ + } + +#define DEFINE_CLK_RPM_CXO_BRANCH(_platform, _name, _active, r_id, r) \ + static struct clk_rpm _platform##_##_active; \ + static struct clk_rpm _platform##_##_name = { \ + .rpm_clk_id = (r_id), \ + .peer = &_platform##_##_active, \ + .rate = (r), \ + .branch = true, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_rpm_branch_ops, \ + .name = #_name, \ + .parent_names = (const char *[]){ "cxo_board" }, \ + .num_parents = 1, \ + }, \ + }; \ + static struct clk_rpm _platform##_##_active = { \ + .rpm_clk_id = (r_id), \ + .active_only = true, \ + .peer = &_platform##_##_name, \ + .rate = (r), \ + .branch = true, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_rpm_branch_ops, \ + .name = #_active, \ + .parent_names = (const char *[]){ "cxo_board" }, \ + .num_parents = 1, \ + }, \ + } + +#define to_clk_rpm(_hw) container_of(_hw, struct clk_rpm, hw) + +struct clk_rpm { + const int rpm_clk_id; + const bool active_only; + unsigned long rate; + bool enabled; + bool branch; + struct clk_rpm *peer; + struct clk_hw hw; + struct qcom_rpm *rpm; +}; + +struct rpm_cc { + struct qcom_rpm *rpm; + struct clk_onecell_data data; + struct clk *clks[]; +}; + +struct rpm_clk_desc { + struct clk_rpm **clks; + size_t num_clks; +}; + +static DEFINE_MUTEX(rpm_clk_lock); + +static int clk_rpm_handoff(struct clk_rpm *r) +{ + int ret; + u32 value = INT_MAX; + + ret = qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE, + r->rpm_clk_id, &value, 1); + if (ret) + return ret; + ret = qcom_rpm_write(r->rpm, QCOM_RPM_SLEEP_STATE, + r->rpm_clk_id, &value, 1); + if (ret) + return ret; + + return 0; +} + +static int clk_rpm_set_rate_active(struct clk_rpm *r, unsigned long rate) +{ + u32 value = DIV_ROUND_UP(rate, 1000); /* to kHz */ + + return qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE, + r->rpm_clk_id, &value, 1); +} + +static int clk_rpm_set_rate_sleep(struct clk_rpm *r, unsigned long rate) +{ + u32 value = DIV_ROUND_UP(rate, 1000); /* to kHz */ + + return qcom_rpm_write(r->rpm, QCOM_RPM_SLEEP_STATE, + r->rpm_clk_id, &value, 1); +} + +static void to_active_sleep(struct clk_rpm *r, unsigned long rate, + unsigned long *active, unsigned long *sleep) +{ + *active = rate; + + /* + * Active-only clocks don't care what the rate is during sleep. So, + * they vote for zero. + */ + if (r->active_only) + *sleep = 0; + else + *sleep = *active; +} + +static int clk_rpm_prepare(struct clk_hw *hw) +{ + struct clk_rpm *r = to_clk_rpm(hw); + struct clk_rpm *peer = r->peer; + unsigned long this_rate = 0, this_sleep_rate = 0; + unsigned long peer_rate = 0, peer_sleep_rate = 0; + unsigned long active_rate, sleep_rate; + int ret = 0; + + mutex_lock(&rpm_clk_lock); + + /* Don't send requests to the RPM if the rate has not been set. */ + if (!r->rate) + goto out; + + to_active_sleep(r, r->rate, &this_rate, &this_sleep_rate); + + /* Take peer clock's rate into account only if it's enabled. */ + if (peer->enabled) + to_active_sleep(peer, peer->rate, + &peer_rate, &peer_sleep_rate); + + active_rate = max(this_rate, peer_rate); + + if (r->branch) + active_rate = !!active_rate; + + ret = clk_rpm_set_rate_active(r, active_rate); + if (ret) + goto out; + + sleep_rate = max(this_sleep_rate, peer_sleep_rate); + if (r->branch) + sleep_rate = !!sleep_rate; + + ret = clk_rpm_set_rate_sleep(r, sleep_rate); + if (ret) + /* Undo the active set vote and restore it */ + ret = clk_rpm_set_rate_active(r, peer_rate); + +out: + if (!ret) + r->enabled = true; + + mutex_unlock(&rpm_clk_lock); + + return ret; +} + +static void clk_rpm_unprepare(struct clk_hw *hw) +{ + struct clk_rpm *r = to_clk_rpm(hw); + struct clk_rpm *peer = r->peer; + unsigned long peer_rate = 0, peer_sleep_rate = 0; + unsigned long active_rate, sleep_rate; + int ret; + + mutex_lock(&rpm_clk_lock); + + if (!r->rate) + goto out; + + /* Take peer clock's rate into account only if it's enabled. */ + if (peer->enabled) + to_active_sleep(peer, peer->rate, &peer_rate, + &peer_sleep_rate); + + active_rate = r->branch ? !!peer_rate : peer_rate; + ret = clk_rpm_set_rate_active(r, active_rate); + if (ret) + goto out; + + sleep_rate = r->branch ? !!peer_sleep_rate : peer_sleep_rate; + ret = clk_rpm_set_rate_sleep(r, sleep_rate); + if (ret) + goto out; + + r->enabled = false; + +out: + mutex_unlock(&rpm_clk_lock); +} + +static int clk_rpm_set_rate(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate) +{ + struct clk_rpm *r = to_clk_rpm(hw); + struct clk_rpm *peer = r->peer; + unsigned long active_rate, sleep_rate; + unsigned long this_rate = 0, this_sleep_rate = 0; + unsigned long peer_rate = 0, peer_sleep_rate = 0; + int ret = 0; + + mutex_lock(&rpm_clk_lock); + + if (!r->enabled) + goto out; + + to_active_sleep(r, rate, &this_rate, &this_sleep_rate); + + /* Take peer clock's rate into account only if it's enabled. */ + if (peer->enabled) + to_active_sleep(peer, peer->rate, + &peer_rate, &peer_sleep_rate); + + active_rate = max(this_rate, peer_rate); + ret = clk_rpm_set_rate_active(r, active_rate); + if (ret) + goto out; + + sleep_rate = max(this_sleep_rate, peer_sleep_rate); + ret = clk_rpm_set_rate_sleep(r, sleep_rate); + if (ret) + goto out; + + r->rate = rate; + +out: + mutex_unlock(&rpm_clk_lock); + + return ret; +} + +static long clk_rpm_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + /* + * RPM handles rate rounding and we don't have a way to + * know what the rate will be, so just return whatever + * rate is requested. + */ + return rate; +} + +static unsigned long clk_rpm_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_rpm *r = to_clk_rpm(hw); + + /* + * RPM handles rate rounding and we don't have a way to + * know what the rate will be, so just return whatever + * rate was set. + */ + return r->rate; +} + +static const struct clk_ops clk_rpm_ops = { + .prepare = clk_rpm_prepare, + .unprepare = clk_rpm_unprepare, + .set_rate = clk_rpm_set_rate, + .round_rate = clk_rpm_round_rate, + .recalc_rate = clk_rpm_recalc_rate, +}; + +static const struct clk_ops clk_rpm_branch_ops = { + .prepare = clk_rpm_prepare, + .unprepare = clk_rpm_unprepare, + .round_rate = clk_rpm_round_rate, + .recalc_rate = clk_rpm_recalc_rate, +}; + +/* apq8064 */ +DEFINE_CLK_RPM_PXO_BRANCH(apq8064, pxo, pxo_a_clk, QCOM_RPM_PXO_CLK, 27000000); +DEFINE_CLK_RPM_CXO_BRANCH(apq8064, cxo, cxo_a_clk, QCOM_RPM_CXO_CLK, 19200000); +DEFINE_CLK_RPM(apq8064, afab_clk, afab_a_clk, QCOM_RPM_APPS_FABRIC_CLK); +DEFINE_CLK_RPM(apq8064, cfpb_clk, cfpb_a_clk, QCOM_RPM_CFPB_CLK); +DEFINE_CLK_RPM(apq8064, daytona_clk, daytona_a_clk, QCOM_RPM_DAYTONA_FABRIC_CLK); +DEFINE_CLK_RPM(apq8064, ebi1_clk, ebi1_a_clk, QCOM_RPM_EBI1_CLK); +DEFINE_CLK_RPM(apq8064, mmfab_clk, mmfab_a_clk, QCOM_RPM_MM_FABRIC_CLK); +DEFINE_CLK_RPM(apq8064, mmfpb_clk, mmfpb_a_clk, QCOM_RPM_MMFPB_CLK); +DEFINE_CLK_RPM(apq8064, sfab_clk, sfab_a_clk, QCOM_RPM_SYS_FABRIC_CLK); +DEFINE_CLK_RPM(apq8064, sfpb_clk, sfpb_a_clk, QCOM_RPM_SFPB_CLK); +DEFINE_CLK_RPM(apq8064, qdss_clk, qdss_a_clk, QCOM_RPM_QDSS_CLK); + +static struct clk_rpm *apq8064_clks[] = { + [RPM_PXO_CLK] = &apq8064_pxo, + [RPM_PXO_A_CLK] = &apq8064_pxo_a_clk, + [RPM_CXO_CLK] = &apq8064_cxo, + [RPM_CXO_A_CLK] = &apq8064_cxo_a_clk, + [RPM_APPS_FABRIC_CLK] = &apq8064_afab_clk, + [RPM_APPS_FABRIC_A_CLK] = &apq8064_afab_a_clk, + [RPM_CFPB_CLK] = &apq8064_cfpb_clk, + [RPM_CFPB_A_CLK] = &apq8064_cfpb_a_clk, + [RPM_DAYTONA_FABRIC_CLK] = &apq8064_daytona_clk, + [RPM_DAYTONA_FABRIC_A_CLK] = &apq8064_daytona_a_clk, + [RPM_EBI1_CLK] = &apq8064_ebi1_clk, + [RPM_EBI1_A_CLK] = &apq8064_ebi1_a_clk, + [RPM_MM_FABRIC_CLK] = &apq8064_mmfab_clk, + [RPM_MM_FABRIC_A_CLK] = &apq8064_mmfab_a_clk, + [RPM_MMFPB_CLK] = &apq8064_mmfpb_clk, + [RPM_MMFPB_A_CLK] = &apq8064_mmfpb_a_clk, + [RPM_SYS_FABRIC_CLK] = &apq8064_sfab_clk, + [RPM_SYS_FABRIC_A_CLK] = &apq8064_sfab_a_clk, + [RPM_SFPB_CLK] = &apq8064_sfpb_clk, + [RPM_SFPB_A_CLK] = &apq8064_sfpb_a_clk, + [RPM_QDSS_CLK] = &apq8064_qdss_clk, + [RPM_QDSS_A_CLK] = &apq8064_qdss_a_clk, +}; + +static const struct rpm_clk_desc rpm_clk_apq8064 = { + .clks = apq8064_clks, + .num_clks = ARRAY_SIZE(apq8064_clks), +}; + +static const struct of_device_id rpm_clk_match_table[] = { + { .compatible = "qcom,rpmcc-apq8064", .data = &rpm_clk_apq8064}, + { } +}; +MODULE_DEVICE_TABLE(of, rpm_clk_match_table); + +static int rpm_clk_probe(struct platform_device *pdev) +{ + struct clk **clks; + struct clk *clk; + struct rpm_cc *rcc; + struct clk_onecell_data *data; + int ret; + size_t num_clks, i; + struct qcom_rpm *rpm; + struct clk_rpm **rpm_clks; + const struct rpm_clk_desc *desc; + + rpm = dev_get_drvdata(pdev->dev.parent); + if (!rpm) { + dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n"); + return -ENODEV; + } + + desc = of_device_get_match_data(&pdev->dev); + if (!desc) + return -EINVAL; + + rpm_clks = desc->clks; + num_clks = desc->num_clks; + + rcc = devm_kzalloc(&pdev->dev, sizeof(*rcc) + sizeof(*clks) * num_clks, + GFP_KERNEL); + if (!rcc) + return -ENOMEM; + + clks = rcc->clks; + data = &rcc->data; + data->clks = clks; + data->clk_num = num_clks; + + for (i = 0; i < num_clks; i++) { + if (!rpm_clks[i]) { + clks[i] = ERR_PTR(-ENOENT); + continue; + } + + rpm_clks[i]->rpm = rpm; + + ret = clk_rpm_handoff(rpm_clks[i]); + if (ret) + goto err; + } + + for (i = 0; i < num_clks; i++) { + if (!rpm_clks[i]) { + clks[i] = ERR_PTR(-ENOENT); + continue; + } + + clk = devm_clk_register(&pdev->dev, &rpm_clks[i]->hw); + 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; + + return 0; +err: + dev_err(&pdev->dev, "Error registering RPM Clock driver (%d)\n", ret); + return ret; +} + +static int rpm_clk_remove(struct platform_device *pdev) +{ + of_clk_del_provider(pdev->dev.of_node); + return 0; +} + +static struct platform_driver rpm_clk_driver = { + .driver = { + .name = "qcom-clk-rpm", + .of_match_table = rpm_clk_match_table, + }, + .probe = rpm_clk_probe, + .remove = rpm_clk_remove, +}; + +static int __init rpm_clk_init(void) +{ + return platform_driver_register(&rpm_clk_driver); +} +core_initcall(rpm_clk_init); + +static void __exit rpm_clk_exit(void) +{ + platform_driver_unregister(&rpm_clk_driver); +} +module_exit(rpm_clk_exit); + +MODULE_DESCRIPTION("Qualcomm RPM Clock Controller Driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:qcom-clk-rpm"); diff --git a/include/dt-bindings/clock/qcom,rpmcc.h b/include/dt-bindings/clock/qcom,rpmcc.h index 9fae52dfe35a..5924cdb71336 100644 --- a/include/dt-bindings/clock/qcom,rpmcc.h +++ b/include/dt-bindings/clock/qcom,rpmcc.h @@ -14,6 +14,30 @@ #ifndef _DT_BINDINGS_CLK_MSM_RPMCC_H #define _DT_BINDINGS_CLK_MSM_RPMCC_H +/* apq8064 */ +#define RPM_PXO_CLK 0 +#define RPM_PXO_A_CLK 1 +#define RPM_CXO_CLK 2 +#define RPM_CXO_A_CLK 3 +#define RPM_APPS_FABRIC_CLK 4 +#define RPM_APPS_FABRIC_A_CLK 5 +#define RPM_CFPB_CLK 6 +#define RPM_CFPB_A_CLK 7 +#define RPM_QDSS_CLK 8 +#define RPM_QDSS_A_CLK 9 +#define RPM_DAYTONA_FABRIC_CLK 10 +#define RPM_DAYTONA_FABRIC_A_CLK 11 +#define RPM_EBI1_CLK 12 +#define RPM_EBI1_A_CLK 13 +#define RPM_MM_FABRIC_CLK 14 +#define RPM_MM_FABRIC_A_CLK 15 +#define RPM_MMFPB_CLK 16 +#define RPM_MMFPB_A_CLK 17 +#define RPM_SYS_FABRIC_CLK 18 +#define RPM_SYS_FABRIC_A_CLK 19 +#define RPM_SFPB_CLK 20 +#define RPM_SFPB_A_CLK 21 + /* msm8916 */ #define RPM_SMD_XO_CLK_SRC 0 #define RPM_SMD_XO_A_CLK_SRC 1 -- 2.39.2