diff mbox

[v7,03/14] clk: qcom: Add CPU clock driver for msm8996

Message ID 1526375616-16904-4-git-send-email-ilialin@codeaurora.org (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Ilia Lin May 15, 2018, 9:13 a.m. UTC 
Each of the CPU clusters (Power and Perf) on msm8996 are
clocked via 2 PLLs, a primary and alternate. There are also
2 Mux'es, a primary and secondary all connected together
as shown below

                             +-------+
              XO             |       |
          +------------------>0      |
                             |       |
                   PLL/2     | SMUX  +----+
                     +------->1      |    |
                     |       |       |    |
                     |       +-------+    |    +-------+
                     |                    +---->0      |
                     |                         |       |
+---------------+    |             +----------->1      | CPU clk
|Primary PLL    +----+ PLL_EARLY   |           |       +------>
|               +------+-----------+    +------>2 PMUX |
+---------------+      |                |      |       |
                       |   +------+     |   +-->3      |
                       +--^+  ACD +-----+   |  +-------+
+---------------+          +------+         |
|Alt PLL        |                           |
|               +---------------------------+
+---------------+         PLL_EARLY

The primary PLL is what drives the CPU clk, except for times
when we are reprogramming the PLL itself (for rate changes) when
we temporarily switch to an alternate PLL. A subsequent patch adds
support to switch between primary and alternate PLL during rate
changes.

The primary PLL operates on a single VCO range, between 600MHz
and 3GHz. However the CPUs do support OPPs with frequencies
between 300MHz and 600MHz. In order to support running the CPUs
at those frequencies we end up having to lock the PLL at twice
the rate and drive the CPU clk via the PLL/2 output and SMUX.

So for frequencies above 600MHz we follow the following path
 Primary PLL --> PLL_EARLY --> PMUX(1) --> CPU clk
and for frequencies between 300MHz and 600MHz we follow
 Primary PLL --> PLL/2 --> SMUX(1) --> PMUX(0) --> CPU clk
Support for this is added in a subsequent patch as well.

ACD stands for Adaptive Clock Distribution and is used to
detect voltage droops. We do not add support for ACD as yet.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Ilia Lin <ilialin@codeaurora.org>
---
 drivers/clk/clk-fixed-factor.c   |   2 +-
 drivers/clk/qcom/Kconfig         |   9 +
 drivers/clk/qcom/Makefile        |   1 +
 drivers/clk/qcom/clk-alpha-pll.h |   6 +
 drivers/clk/qcom/clk-cpu-8996.c  | 412 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 429 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/qcom/clk-cpu-8996.c

Comments

Amit Kucheria May 16, 2018, 1:12 p.m. UTC | #1 
On Tue, May 15, 2018 at 12:13 PM, Ilia Lin <ilialin@codeaurora.org> wrote:
> Each of the CPU clusters (Power and Perf) on msm8996 are
> clocked via 2 PLLs, a primary and alternate. There are also
> 2 Mux'es, a primary and secondary all connected together
> as shown below
>
>                              +-------+
>               XO             |       |
>           +------------------>0      |
>                              |       |
>                    PLL/2     | SMUX  +----+
>                      +------->1      |    |
>                      |       |       |    |
>                      |       +-------+    |    +-------+
>                      |                    +---->0      |
>                      |                         |       |
> +---------------+    |             +----------->1      | CPU clk
> |Primary PLL    +----+ PLL_EARLY   |           |       +------>
> |               +------+-----------+    +------>2 PMUX |
> +---------------+      |                |      |       |
>                        |   +------+     |   +-->3      |
>                        +--^+  ACD +-----+   |  +-------+
> +---------------+          +------+         |
> |Alt PLL        |                           |
> |               +---------------------------+
> +---------------+         PLL_EARLY
>
> The primary PLL is what drives the CPU clk, except for times
> when we are reprogramming the PLL itself (for rate changes) when
> we temporarily switch to an alternate PLL. A subsequent patch adds
> support to switch between primary and alternate PLL during rate
> changes.
>
> The primary PLL operates on a single VCO range, between 600MHz
> and 3GHz. However the CPUs do support OPPs with frequencies
> between 300MHz and 600MHz. In order to support running the CPUs
> at those frequencies we end up having to lock the PLL at twice
> the rate and drive the CPU clk via the PLL/2 output and SMUX.
>
> So for frequencies above 600MHz we follow the following path
>  Primary PLL --> PLL_EARLY --> PMUX(1) --> CPU clk
> and for frequencies between 300MHz and 600MHz we follow
>  Primary PLL --> PLL/2 --> SMUX(1) --> PMUX(0) --> CPU clk
> Support for this is added in a subsequent patch as well.
>
> ACD stands for Adaptive Clock Distribution and is used to
> detect voltage droops. We do not add support for ACD as yet.
>
> Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
> Signed-off-by: Ilia Lin <ilialin@codeaurora.org>
> ---
>  drivers/clk/clk-fixed-factor.c   |   2 +-
>  drivers/clk/qcom/Kconfig         |   9 +
>  drivers/clk/qcom/Makefile        |   1 +
>  drivers/clk/qcom/clk-alpha-pll.h |   6 +
>  drivers/clk/qcom/clk-cpu-8996.c  | 412 +++++++++++++++++++++++++++++++++++++++
>  5 files changed, 429 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/clk/qcom/clk-cpu-8996.c
>
> diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
> index a5d402d..8e39bda 100644
> --- a/drivers/clk/clk-fixed-factor.c
> +++ b/drivers/clk/clk-fixed-factor.c
> @@ -94,7 +94,7 @@ struct clk_hw *clk_hw_register_fixed_factor(struct device *dev,
>         init.num_parents = 1;
>
>         hw = &fix->hw;
> -       ret = clk_hw_register(dev, hw);
> +       ret = devm_clk_hw_register(dev, hw);

This should probably go in its own separate patch.

>         if (ret) {
>                 kfree(fix);
>                 hw = ERR_PTR(ret);
> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
> index e42e1af..866ce1f 100644
> --- a/drivers/clk/qcom/Kconfig
> +++ b/drivers/clk/qcom/Kconfig
> @@ -33,6 +33,15 @@ config QCOM_CLK_APCS_MSM8916
>           Say Y if you want to support CPU frequency scaling on devices
>           such as msm8916.
>
> +config QCOM_CLK_APCC_MSM8996
> +       tristate "MSM8996 CPU Clock Controller"
> +       depends on COMMON_CLK_QCOM
> +       select QCOM_KRYO_L2_ACCESSORS
> +       help
> +         Support for the CPU clock controller on msm8996 devices.
> +         Say Y if you want to support CPU clock scaling using CPUfreq
> +         drivers for dyanmic power management.
> +
>  config QCOM_CLK_RPM
>         tristate "RPM based Clock Controller"
>         depends on COMMON_CLK_QCOM && MFD_QCOM_RPM
> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
> index 7c09ab1..a822fc8 100644
> --- a/drivers/clk/qcom/Makefile
> +++ b/drivers/clk/qcom/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
>  obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
>  obj-$(CONFIG_QCOM_A53PLL) += a53-pll.o
>  obj-$(CONFIG_QCOM_CLK_APCS_MSM8916) += apcs-msm8916.o
> +obj-$(CONFIG_QCOM_CLK_APCC_MSM8996) += clk-cpu-8996.o
>  obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.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-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
> index f981b48..9ce2a32 100644
> --- a/drivers/clk/qcom/clk-alpha-pll.h
> +++ b/drivers/clk/qcom/clk-alpha-pll.h
> @@ -50,6 +50,12 @@ struct pll_vco {
>         u32 val;
>  };
>
> +#define VCO(a, b, c) { \
> +       .val = a,\
> +       .min_freq = b,\
> +       .max_freq = c,\
> +}
> +
>  /**
>   * struct clk_alpha_pll - phase locked loop (PLL)
>   * @offset: base address of registers
> diff --git a/drivers/clk/qcom/clk-cpu-8996.c b/drivers/clk/qcom/clk-cpu-8996.c
> new file mode 100644
> index 0000000..beb97eb
> --- /dev/null
> +++ b/drivers/clk/qcom/clk-cpu-8996.c
> @@ -0,0 +1,412 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * 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.
> + */
> +
> +/*
> + * Each of the CPU clusters (Power and Perf) on msm8996 are
> + * clocked via 2 PLLs, a primary and alternate. There are also
> + * 2 Mux'es, a primary and secondary all connected together
> + * as shown below
> + *
> + *                              +-------+
> + *               XO             |       |
> + *           +------------------>0      |
> + *                              |       |
> + *                    PLL/2     | SMUX  +----+
> + *                      +------->1      |    |
> + *                      |       |       |    |
> + *                      |       +-------+    |    +-------+
> + *                      |                    +---->0      |
> + *                      |                         |       |
> + * +---------------+    |             +----------->1      | CPU clk
> + * |Primary PLL    +----+ PLL_EARLY   |           |       +------>
> + * |               +------+-----------+    +------>2 PMUX |
> + * +---------------+      |                |      |       |
> + *                        |   +------+     |   +-->3      |
> + *                        +--^+  ACD +-----+   |  +-------+
> + * +---------------+          +------+         |
> + * |Alt PLL        |                           |
> + * |               +---------------------------+
> + * +---------------+         PLL_EARLY
> + *
> + * The primary PLL is what drives the CPU clk, except for times
> + * when we are reprogramming the PLL itself (for rate changes) when
> + * we temporarily switch to an alternate PLL. A subsequent patch adds
> + * support to switch between primary and alternate PLL during rate
> + * changes.
> + *
> + * The primary PLL operates on a single VCO range, between 600MHz
> + * and 3GHz. However the CPUs do support OPPs with frequencies
> + * between 300MHz and 600MHz. In order to support running the CPUs
> + * at those frequencies we end up having to lock the PLL at twice
> + * the rate and drive the CPU clk via the PLL/2 output and SMUX.
> + *
> + * So for frequencies above 600MHz we follow the following path
> + *  Primary PLL --> PLL_EARLY --> PMUX(1) --> CPU clk
> + * and for frequencies between 300MHz and 600MHz we follow
> + *  Primary PLL --> PLL/2 --> SMUX(1) --> PMUX(0) --> CPU clk
> + * Support for this is added in a subsequent patch as well.
> + *
> + * ACD stands for Adaptive Clock Distribution and is used to
> + * detect voltage droops. We do not add support for ACD as yet.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include "clk-alpha-pll.h"
> +#include "clk-regmap.h"
> +
> +enum _pmux_input {
> +       DIV_2_INDEX = 0,
> +       PLL_INDEX,
> +       ACD_INDEX,
> +       ALT_INDEX,
> +       NUM_OF_PMUX_INPUTS
> +};
> +
> +static const u8 prim_pll_regs[PLL_OFF_MAX_REGS] = {
> +       [PLL_OFF_L_VAL] = 0x04,
> +       [PLL_OFF_ALPHA_VAL] = 0x08,
> +       [PLL_OFF_USER_CTL] = 0x10,
> +       [PLL_OFF_CONFIG_CTL] = 0x18,
> +       [PLL_OFF_CONFIG_CTL_U] = 0x1c,
> +       [PLL_OFF_TEST_CTL] = 0x20,
> +       [PLL_OFF_TEST_CTL_U] = 0x24,
> +       [PLL_OFF_STATUS] = 0x28,
> +};
> +
> +static const u8 alt_pll_regs[PLL_OFF_MAX_REGS] = {
> +       [PLL_OFF_L_VAL] = 0x04,
> +       [PLL_OFF_ALPHA_VAL] = 0x08,
> +       [PLL_OFF_ALPHA_VAL_U] = 0x0c,
> +       [PLL_OFF_USER_CTL] = 0x10,
> +       [PLL_OFF_USER_CTL_U] = 0x14,
> +       [PLL_OFF_CONFIG_CTL] = 0x18,
> +       [PLL_OFF_TEST_CTL] = 0x20,
> +       [PLL_OFF_TEST_CTL_U] = 0x24,
> +       [PLL_OFF_STATUS] = 0x28,
> +};
> +
> +/* PLLs */
> +
> +static const struct alpha_pll_config hfpll_config = {
> +       .l = 60,
> +       .config_ctl_val = 0x200d4828,
> +       .config_ctl_hi_val = 0x006,
> +       .pre_div_mask = BIT(12),
> +       .post_div_mask = 0x3 << 8,
> +       .main_output_mask = BIT(0),
> +       .early_output_mask = BIT(3),
> +};
> +
> +static struct clk_alpha_pll perfcl_pll = {
> +       .offset = 0x80000,
> +       .regs = prim_pll_regs,
> +       .flags = SUPPORTS_DYNAMIC_UPDATE | SUPPORTS_FSM_MODE,
> +       .clkr.hw.init = &(struct clk_init_data){
> +               .name = "perfcl_pll",
> +               .parent_names = (const char *[]){ "xo" },
> +               .num_parents = 1,
> +               .ops = &clk_alpha_pll_huayra_ops,
> +       },
> +};
> +
> +static struct clk_alpha_pll pwrcl_pll = {
> +       .offset = 0x0,
> +       .regs = prim_pll_regs,
> +       .flags = SUPPORTS_DYNAMIC_UPDATE | SUPPORTS_FSM_MODE,
> +       .clkr.hw.init = &(struct clk_init_data){
> +               .name = "pwrcl_pll",
> +               .parent_names = (const char *[]){ "xo" },
> +               .num_parents = 1,
> +               .ops = &clk_alpha_pll_huayra_ops,
> +       },
> +};
> +
> +static const struct pll_vco alt_pll_vco_modes[] = {
> +       VCO(3,  250000000,  500000000),
> +       VCO(2,  500000000,  750000000),
> +       VCO(1,  750000000, 1000000000),
> +       VCO(0, 1000000000, 2150400000),
> +};
> +
> +static const struct alpha_pll_config altpll_config = {
> +       .l = 16,
> +       .vco_val = 0x3 << 20,
> +       .vco_mask = 0x3 << 20,
> +       .config_ctl_val = 0x4001051b,
> +       .post_div_mask = 0x3 << 8,
> +       .post_div_val = 0x1,
> +       .main_output_mask = BIT(0),
> +       .early_output_mask = BIT(3),
> +};
> +
> +static struct clk_alpha_pll perfcl_alt_pll = {
> +       .offset = 0x80100,
> +       .regs = alt_pll_regs,
> +       .vco_table = alt_pll_vco_modes,
> +       .num_vco = ARRAY_SIZE(alt_pll_vco_modes),
> +       .flags = SUPPORTS_OFFLINE_REQ | SUPPORTS_FSM_MODE,
> +       .clkr.hw.init = &(struct clk_init_data) {
> +               .name = "perfcl_alt_pll",
> +               .parent_names = (const char *[]){ "xo" },
> +               .num_parents = 1,
> +               .ops = &clk_alpha_pll_hwfsm_ops,
> +       },
> +};
> +
> +static struct clk_alpha_pll pwrcl_alt_pll = {
> +       .offset = 0x100,
> +       .regs = alt_pll_regs,
> +       .vco_table = alt_pll_vco_modes,
> +       .num_vco = ARRAY_SIZE(alt_pll_vco_modes),
> +       .flags = SUPPORTS_OFFLINE_REQ | SUPPORTS_FSM_MODE,
> +       .clkr.hw.init = &(struct clk_init_data) {
> +               .name = "pwrcl_alt_pll",
> +               .parent_names = (const char *[]){ "xo" },
> +               .num_parents = 1,
> +               .ops = &clk_alpha_pll_hwfsm_ops,
> +       },
> +};
> +
> +/* Mux'es */
> +
> +struct clk_cpu_8996_mux {
> +       u32     reg;
> +       u8      shift;
> +       u8      width;
> +       struct clk_hw   *pll;
> +       struct clk_regmap clkr;
> +};
> +
> +static inline
> +struct clk_cpu_8996_mux *to_clk_cpu_8996_mux_hw(struct clk_hw *hw)
> +{
> +       return container_of(to_clk_regmap(hw), struct clk_cpu_8996_mux, clkr);
> +}
> +
> +static u8 clk_cpu_8996_mux_get_parent(struct clk_hw *hw)
> +{
> +       u32 val;
> +       struct clk_regmap *clkr = to_clk_regmap(hw);
> +       struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_hw(hw);
> +       u32 mask = (u32)GENMASK(cpuclk->width - 1, 0);
> +
> +       regmap_read(clkr->regmap, cpuclk->reg, &val);
> +       val >>= (u32)(cpuclk->shift);
> +
> +       return (u8)(val & mask);
> +}
> +
> +static int clk_cpu_8996_mux_set_parent(struct clk_hw *hw, u8 index)
> +{
> +       u32 val;
> +       struct clk_regmap *clkr = to_clk_regmap(hw);
> +       struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_hw(hw);
> +       unsigned int mask = GENMASK(cpuclk->width + cpuclk->shift - 1,
> +                                   cpuclk->shift);
> +
> +       val = (u32)index;
> +       val <<= (u32)(cpuclk->shift);
> +
> +       return regmap_update_bits(clkr->regmap, cpuclk->reg, mask, val);
> +}
> +
> +static int
> +clk_cpu_8996_mux_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
> +{
> +       struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_hw(hw);
> +       struct clk_hw *parent = cpuclk->pll;
> +
> +       req->best_parent_rate = clk_hw_round_rate(parent, req->rate);
> +       req->best_parent_hw = parent;
> +
> +       return 0;
> +}
> +
> +const struct clk_ops clk_cpu_8996_mux_ops = {
> +       .set_parent = clk_cpu_8996_mux_set_parent,
> +       .get_parent = clk_cpu_8996_mux_get_parent,
> +       .determine_rate = clk_cpu_8996_mux_determine_rate,
> +};
> +
> +static struct clk_cpu_8996_mux pwrcl_smux = {
> +       .reg = 0x40,
> +       .shift = 2,
> +       .width = 2,
> +       .clkr.hw.init = &(struct clk_init_data) {
> +               .name = "pwrcl_smux",
> +               .parent_names = (const char *[]){
> +                       "xo",
> +                       "pwrcl_pll_main",
> +               },
> +               .num_parents = 2,
> +               .ops = &clk_cpu_8996_mux_ops,
> +               .flags = CLK_SET_RATE_PARENT,
> +       },
> +};
> +
> +static struct clk_cpu_8996_mux perfcl_smux = {
> +       .reg = 0x80040,
> +       .shift = 2,
> +       .width = 2,
> +       .clkr.hw.init = &(struct clk_init_data) {
> +               .name = "perfcl_smux",
> +               .parent_names = (const char *[]){
> +                       "xo",
> +                       "perfcl_pll_main",
> +               },
> +               .num_parents = 2,
> +               .ops = &clk_cpu_8996_mux_ops,
> +               .flags = CLK_SET_RATE_PARENT,
> +       },
> +};
> +
> +static struct clk_cpu_8996_mux pwrcl_pmux = {
> +       .reg = 0x40,
> +       .shift = 0,
> +       .width = 2,
> +       .pll = &pwrcl_pll.clkr.hw,
> +       .clkr.hw.init = &(struct clk_init_data) {
> +               .name = "pwrcl_pmux",
> +               .parent_names = (const char *[]){
> +                       "pwrcl_smux",
> +                       "pwrcl_pll",
> +                       "pwrcl_pll_acd",
> +                       "pwrcl_alt_pll",
> +               },
> +               .num_parents = 4,
> +               .ops = &clk_cpu_8996_mux_ops,
> +               .flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
> +       },
> +};
> +
> +static struct clk_cpu_8996_mux perfcl_pmux = {
> +       .reg = 0x80040,
> +       .shift = 0,
> +       .width = 2,
> +       .pll = &perfcl_pll.clkr.hw,
> +       .clkr.hw.init = &(struct clk_init_data) {
> +               .name = "perfcl_pmux",
> +               .parent_names = (const char *[]){
> +                       "perfcl_smux",
> +                       "perfcl_pll",
> +                       "perfcl_pll_acd",
> +                       "perfcl_alt_pll",
> +               },
> +               .num_parents = 4,
> +               .ops = &clk_cpu_8996_mux_ops,
> +               .flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
> +       },
> +};
> +
> +static const struct regmap_config cpu_msm8996_regmap_config = {
> +       .reg_bits               = 32,
> +       .reg_stride             = 4,
> +       .val_bits               = 32,
> +       .max_register           = 0x80210,
> +       .fast_io                = true,
> +       .val_format_endian      = REGMAP_ENDIAN_LITTLE,
> +};
> +
> +struct clk_regmap *clks[] = {
> +       &perfcl_pll.clkr,
> +       &pwrcl_pll.clkr,
> +       &perfcl_alt_pll.clkr,
> +       &pwrcl_alt_pll.clkr,
> +       &perfcl_smux.clkr,
> +       &pwrcl_smux.clkr,
> +       &perfcl_pmux.clkr,
> +       &pwrcl_pmux.clkr,
> +};
> +
> +static int
> +qcom_cpu_clk_msm8996_register_clks(struct device *dev, struct regmap *regmap)
> +{
> +       int i, ret;
> +
> +       perfcl_smux.pll = clk_hw_register_fixed_factor(dev, "perfcl_pll_main",
> +                                                      "perfcl_pll",
> +                                                  CLK_SET_RATE_PARENT, 1, 2);
> +
> +       pwrcl_smux.pll = clk_hw_register_fixed_factor(dev, "pwrcl_pll_main",
> +                                                     "pwrcl_pll",
> +                                                  CLK_SET_RATE_PARENT, 1, 2);
> +
> +       for (i = 0; i < ARRAY_SIZE(clks); i++) {
> +               ret = devm_clk_register_regmap(dev, clks[i]);
> +               if (ret)
> +                       return ret;
> +       }
> +
> +       clk_alpha_pll_configure(&perfcl_pll, regmap, &hfpll_config);
> +       clk_alpha_pll_configure(&pwrcl_pll, regmap, &hfpll_config);
> +       clk_alpha_pll_configure(&perfcl_alt_pll, regmap, &altpll_config);
> +       clk_alpha_pll_configure(&pwrcl_alt_pll, regmap, &altpll_config);
> +
> +       return ret;
> +}
> +
> +static int qcom_cpu_clk_msm8996_driver_probe(struct platform_device *pdev)
> +{
> +       int ret;
> +       void __iomem *base;
> +       struct resource *res;
> +       struct regmap *regmap;
> +       struct clk_hw_onecell_data *data;
> +       struct device *dev = &pdev->dev;
> +
> +       data = devm_kzalloc(dev, sizeof(*data) + 2 * sizeof(struct clk_hw *),
> +                           GFP_KERNEL);
> +       if (!data)
> +               return -ENOMEM;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       base = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(base))
> +               return PTR_ERR(base);
> +
> +       regmap = devm_regmap_init_mmio(dev, base, &cpu_msm8996_regmap_config);
> +       if (IS_ERR(regmap))
> +               return PTR_ERR(regmap);
> +
> +       ret = qcom_cpu_clk_msm8996_register_clks(dev, regmap);
> +       if (ret)
> +               return ret;
> +
> +       data->hws[0] = &pwrcl_pmux.clkr.hw;
> +       data->hws[1] = &perfcl_pmux.clkr.hw;
> +       data->num = 2;
> +
> +       return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, data);
> +}
> +
> +static const struct of_device_id qcom_cpu_clk_msm8996_match_table[] = {
> +       { .compatible = "qcom,msm8996-apcc" },
> +       {}
> +};
> +
> +static struct platform_driver qcom_cpu_clk_msm8996_driver = {
> +       .probe = qcom_cpu_clk_msm8996_driver_probe,
> +       .driver = {
> +               .name = "qcom-msm8996-apcc",
> +               .of_match_table = qcom_cpu_clk_msm8996_match_table,
> +       },
> +};
> +module_platform_driver(qcom_cpu_clk_msm8996_driver);
> +
> +MODULE_ALIAS("platform:msm8996-apcc");
> +MODULE_DESCRIPTION("QCOM MSM8996 CPU Clock Driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.9.1
>
kernel test robot May 17, 2018, 4:31 p.m. UTC | #2 
Hi Ilia,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on v4.17-rc5]
[cannot apply to clk/clk-next next-20180517]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ilia-Lin/CPU-scaling-support-for-msm8996/20180516-064721
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: xtensa-allyesconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

All warnings (new ones prefixed by >>):

>> drivers/clk/qcom/clk-cpu-8996.c:142:2: warning: this decimal constant is unsigned only in ISO C90
     VCO(0, 1000000000, 2150400000),
     ^~~

vim +142 drivers/clk/qcom/clk-cpu-8996.c

   137	
   138	static const struct pll_vco alt_pll_vco_modes[] = {
   139		VCO(3,  250000000,  500000000),
   140		VCO(2,  500000000,  750000000),
   141		VCO(1,  750000000, 1000000000),
 > 142		VCO(0, 1000000000, 2150400000),
   143	};
   144	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
kernel test robot May 17, 2018, 4:51 p.m. UTC | #3 
Hi Ilia,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on v4.17-rc5]
[cannot apply to clk/clk-next next-20180517]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ilia-Lin/CPU-scaling-support-for-msm8996/20180516-064721
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/clk/qcom/clk-cpu-8996.c:142:9: sparse: constant 2150400000 is so big it is long
>> drivers/clk/qcom/clk-cpu-8996.c:239:22: sparse: symbol 'clk_cpu_8996_mux_ops' was not declared. Should it be static?
   drivers/clk/qcom/clk-cpu-8996.c:324:19: sparse: symbol 'clks' was not declared. Should it be static?

vim +142 drivers/clk/qcom/clk-cpu-8996.c

   137	
   138	static const struct pll_vco alt_pll_vco_modes[] = {
   139		VCO(3,  250000000,  500000000),
   140		VCO(2,  500000000,  750000000),
   141		VCO(1,  750000000, 1000000000),
 > 142		VCO(0, 1000000000, 2150400000),
   143	};
   144	
   145	static const struct alpha_pll_config altpll_config = {
   146		.l = 16,
   147		.vco_val = 0x3 << 20,
   148		.vco_mask = 0x3 << 20,
   149		.config_ctl_val = 0x4001051b,
   150		.post_div_mask = 0x3 << 8,
   151		.post_div_val = 0x1,
   152		.main_output_mask = BIT(0),
   153		.early_output_mask = BIT(3),
   154	};
   155	
   156	static struct clk_alpha_pll perfcl_alt_pll = {
   157		.offset = 0x80100,
   158		.regs = alt_pll_regs,
   159		.vco_table = alt_pll_vco_modes,
   160		.num_vco = ARRAY_SIZE(alt_pll_vco_modes),
   161		.flags = SUPPORTS_OFFLINE_REQ | SUPPORTS_FSM_MODE,
   162		.clkr.hw.init = &(struct clk_init_data) {
   163			.name = "perfcl_alt_pll",
   164			.parent_names = (const char *[]){ "xo" },
   165			.num_parents = 1,
   166			.ops = &clk_alpha_pll_hwfsm_ops,
   167		},
   168	};
   169	
   170	static struct clk_alpha_pll pwrcl_alt_pll = {
   171		.offset = 0x100,
   172		.regs = alt_pll_regs,
   173		.vco_table = alt_pll_vco_modes,
   174		.num_vco = ARRAY_SIZE(alt_pll_vco_modes),
   175		.flags = SUPPORTS_OFFLINE_REQ | SUPPORTS_FSM_MODE,
   176		.clkr.hw.init = &(struct clk_init_data) {
   177			.name = "pwrcl_alt_pll",
   178			.parent_names = (const char *[]){ "xo" },
   179			.num_parents = 1,
   180			.ops = &clk_alpha_pll_hwfsm_ops,
   181		},
   182	};
   183	
   184	/* Mux'es */
   185	
   186	struct clk_cpu_8996_mux {
   187		u32	reg;
   188		u8	shift;
   189		u8	width;
   190		struct clk_hw	*pll;
   191		struct clk_regmap clkr;
   192	};
   193	
   194	static inline
   195	struct clk_cpu_8996_mux *to_clk_cpu_8996_mux_hw(struct clk_hw *hw)
   196	{
   197		return container_of(to_clk_regmap(hw), struct clk_cpu_8996_mux, clkr);
   198	}
   199	
   200	static u8 clk_cpu_8996_mux_get_parent(struct clk_hw *hw)
   201	{
   202		u32 val;
   203		struct clk_regmap *clkr = to_clk_regmap(hw);
   204		struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_hw(hw);
   205		u32 mask = (u32)GENMASK(cpuclk->width - 1, 0);
   206	
   207		regmap_read(clkr->regmap, cpuclk->reg, &val);
   208		val >>= (u32)(cpuclk->shift);
   209	
   210		return (u8)(val & mask);
   211	}
   212	
   213	static int clk_cpu_8996_mux_set_parent(struct clk_hw *hw, u8 index)
   214	{
   215		u32 val;
   216		struct clk_regmap *clkr = to_clk_regmap(hw);
   217		struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_hw(hw);
   218		unsigned int mask = GENMASK(cpuclk->width + cpuclk->shift - 1,
   219					    cpuclk->shift);
   220	
   221		val = (u32)index;
   222		val <<= (u32)(cpuclk->shift);
   223	
   224		return regmap_update_bits(clkr->regmap, cpuclk->reg, mask, val);
   225	}
   226	
   227	static int
   228	clk_cpu_8996_mux_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
   229	{
   230		struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_hw(hw);
   231		struct clk_hw *parent = cpuclk->pll;
   232	
   233		req->best_parent_rate = clk_hw_round_rate(parent, req->rate);
   234		req->best_parent_hw = parent;
   235	
   236		return 0;
   237	}
   238	
 > 239	const struct clk_ops clk_cpu_8996_mux_ops = {
   240		.set_parent = clk_cpu_8996_mux_set_parent,
   241		.get_parent = clk_cpu_8996_mux_get_parent,
   242		.determine_rate = clk_cpu_8996_mux_determine_rate,
   243	};
   244	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
diff mbox

Patch

diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
index a5d402d..8e39bda 100644
--- a/drivers/clk/clk-fixed-factor.c
+++ b/drivers/clk/clk-fixed-factor.c
@@ -94,7 +94,7 @@  struct clk_hw *clk_hw_register_fixed_factor(struct device *dev,
 	init.num_parents = 1;
 
 	hw = &fix->hw;
-	ret = clk_hw_register(dev, hw);
+	ret = devm_clk_hw_register(dev, hw);
 	if (ret) {
 		kfree(fix);
 		hw = ERR_PTR(ret);
diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
index e42e1af..866ce1f 100644
--- a/drivers/clk/qcom/Kconfig
+++ b/drivers/clk/qcom/Kconfig
@@ -33,6 +33,15 @@  config QCOM_CLK_APCS_MSM8916
 	  Say Y if you want to support CPU frequency scaling on devices
 	  such as msm8916.
 
+config QCOM_CLK_APCC_MSM8996
+	tristate "MSM8996 CPU Clock Controller"
+	depends on COMMON_CLK_QCOM
+	select QCOM_KRYO_L2_ACCESSORS
+	help
+	  Support for the CPU clock controller on msm8996 devices.
+	  Say Y if you want to support CPU clock scaling using CPUfreq
+	  drivers for dyanmic power management.
+
 config QCOM_CLK_RPM
 	tristate "RPM based Clock Controller"
 	depends on COMMON_CLK_QCOM && MFD_QCOM_RPM
diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
index 7c09ab1..a822fc8 100644
--- a/drivers/clk/qcom/Makefile
+++ b/drivers/clk/qcom/Makefile
@@ -36,6 +36,7 @@  obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
 obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
 obj-$(CONFIG_QCOM_A53PLL) += a53-pll.o
 obj-$(CONFIG_QCOM_CLK_APCS_MSM8916) += apcs-msm8916.o
+obj-$(CONFIG_QCOM_CLK_APCC_MSM8996) += clk-cpu-8996.o
 obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.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-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index f981b48..9ce2a32 100644
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -50,6 +50,12 @@  struct pll_vco {
 	u32 val;
 };
 
+#define VCO(a, b, c) { \
+	.val = a,\
+	.min_freq = b,\
+	.max_freq = c,\
+}
+
 /**
  * struct clk_alpha_pll - phase locked loop (PLL)
  * @offset: base address of registers
diff --git a/drivers/clk/qcom/clk-cpu-8996.c b/drivers/clk/qcom/clk-cpu-8996.c
new file mode 100644
index 0000000..beb97eb
--- /dev/null
+++ b/drivers/clk/qcom/clk-cpu-8996.c
@@ -0,0 +1,412 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+/*
+ * Each of the CPU clusters (Power and Perf) on msm8996 are
+ * clocked via 2 PLLs, a primary and alternate. There are also
+ * 2 Mux'es, a primary and secondary all connected together
+ * as shown below
+ *
+ *                              +-------+
+ *               XO             |       |
+ *           +------------------>0      |
+ *                              |       |
+ *                    PLL/2     | SMUX  +----+
+ *                      +------->1      |    |
+ *                      |       |       |    |
+ *                      |       +-------+    |    +-------+
+ *                      |                    +---->0      |
+ *                      |                         |       |
+ * +---------------+    |             +----------->1      | CPU clk
+ * |Primary PLL    +----+ PLL_EARLY   |           |       +------>
+ * |               +------+-----------+    +------>2 PMUX |
+ * +---------------+      |                |      |       |
+ *                        |   +------+     |   +-->3      |
+ *                        +--^+  ACD +-----+   |  +-------+
+ * +---------------+          +------+         |
+ * |Alt PLL        |                           |
+ * |               +---------------------------+
+ * +---------------+         PLL_EARLY
+ *
+ * The primary PLL is what drives the CPU clk, except for times
+ * when we are reprogramming the PLL itself (for rate changes) when
+ * we temporarily switch to an alternate PLL. A subsequent patch adds
+ * support to switch between primary and alternate PLL during rate
+ * changes.
+ *
+ * The primary PLL operates on a single VCO range, between 600MHz
+ * and 3GHz. However the CPUs do support OPPs with frequencies
+ * between 300MHz and 600MHz. In order to support running the CPUs
+ * at those frequencies we end up having to lock the PLL at twice
+ * the rate and drive the CPU clk via the PLL/2 output and SMUX.
+ *
+ * So for frequencies above 600MHz we follow the following path
+ *  Primary PLL --> PLL_EARLY --> PMUX(1) --> CPU clk
+ * and for frequencies between 300MHz and 600MHz we follow
+ *  Primary PLL --> PLL/2 --> SMUX(1) --> PMUX(0) --> CPU clk
+ * Support for this is added in a subsequent patch as well.
+ *
+ * ACD stands for Adaptive Clock Distribution and is used to
+ * detect voltage droops. We do not add support for ACD as yet.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "clk-alpha-pll.h"
+#include "clk-regmap.h"
+
+enum _pmux_input {
+	DIV_2_INDEX = 0,
+	PLL_INDEX,
+	ACD_INDEX,
+	ALT_INDEX,
+	NUM_OF_PMUX_INPUTS
+};
+
+static const u8 prim_pll_regs[PLL_OFF_MAX_REGS] = {
+       [PLL_OFF_L_VAL] = 0x04,
+       [PLL_OFF_ALPHA_VAL] = 0x08,
+       [PLL_OFF_USER_CTL] = 0x10,
+       [PLL_OFF_CONFIG_CTL] = 0x18,
+       [PLL_OFF_CONFIG_CTL_U] = 0x1c,
+       [PLL_OFF_TEST_CTL] = 0x20,
+       [PLL_OFF_TEST_CTL_U] = 0x24,
+       [PLL_OFF_STATUS] = 0x28,
+};
+
+static const u8 alt_pll_regs[PLL_OFF_MAX_REGS] = {
+       [PLL_OFF_L_VAL] = 0x04,
+       [PLL_OFF_ALPHA_VAL] = 0x08,
+       [PLL_OFF_ALPHA_VAL_U] = 0x0c,
+       [PLL_OFF_USER_CTL] = 0x10,
+       [PLL_OFF_USER_CTL_U] = 0x14,
+       [PLL_OFF_CONFIG_CTL] = 0x18,
+       [PLL_OFF_TEST_CTL] = 0x20,
+       [PLL_OFF_TEST_CTL_U] = 0x24,
+       [PLL_OFF_STATUS] = 0x28,
+};
+
+/* PLLs */
+
+static const struct alpha_pll_config hfpll_config = {
+	.l = 60,
+	.config_ctl_val = 0x200d4828,
+	.config_ctl_hi_val = 0x006,
+	.pre_div_mask = BIT(12),
+	.post_div_mask = 0x3 << 8,
+	.main_output_mask = BIT(0),
+	.early_output_mask = BIT(3),
+};
+
+static struct clk_alpha_pll perfcl_pll = {
+	.offset = 0x80000,
+	.regs = prim_pll_regs,
+	.flags = SUPPORTS_DYNAMIC_UPDATE | SUPPORTS_FSM_MODE,
+	.clkr.hw.init = &(struct clk_init_data){
+		.name = "perfcl_pll",
+		.parent_names = (const char *[]){ "xo" },
+		.num_parents = 1,
+		.ops = &clk_alpha_pll_huayra_ops,
+	},
+};
+
+static struct clk_alpha_pll pwrcl_pll = {
+	.offset = 0x0,
+	.regs = prim_pll_regs,
+	.flags = SUPPORTS_DYNAMIC_UPDATE | SUPPORTS_FSM_MODE,
+	.clkr.hw.init = &(struct clk_init_data){
+		.name = "pwrcl_pll",
+		.parent_names = (const char *[]){ "xo" },
+		.num_parents = 1,
+		.ops = &clk_alpha_pll_huayra_ops,
+	},
+};
+
+static const struct pll_vco alt_pll_vco_modes[] = {
+	VCO(3,  250000000,  500000000),
+	VCO(2,  500000000,  750000000),
+	VCO(1,  750000000, 1000000000),
+	VCO(0, 1000000000, 2150400000),
+};
+
+static const struct alpha_pll_config altpll_config = {
+	.l = 16,
+	.vco_val = 0x3 << 20,
+	.vco_mask = 0x3 << 20,
+	.config_ctl_val = 0x4001051b,
+	.post_div_mask = 0x3 << 8,
+	.post_div_val = 0x1,
+	.main_output_mask = BIT(0),
+	.early_output_mask = BIT(3),
+};
+
+static struct clk_alpha_pll perfcl_alt_pll = {
+	.offset = 0x80100,
+	.regs = alt_pll_regs,
+	.vco_table = alt_pll_vco_modes,
+	.num_vco = ARRAY_SIZE(alt_pll_vco_modes),
+	.flags = SUPPORTS_OFFLINE_REQ | SUPPORTS_FSM_MODE,
+	.clkr.hw.init = &(struct clk_init_data) {
+		.name = "perfcl_alt_pll",
+		.parent_names = (const char *[]){ "xo" },
+		.num_parents = 1,
+		.ops = &clk_alpha_pll_hwfsm_ops,
+	},
+};
+
+static struct clk_alpha_pll pwrcl_alt_pll = {
+	.offset = 0x100,
+	.regs = alt_pll_regs,
+	.vco_table = alt_pll_vco_modes,
+	.num_vco = ARRAY_SIZE(alt_pll_vco_modes),
+	.flags = SUPPORTS_OFFLINE_REQ | SUPPORTS_FSM_MODE,
+	.clkr.hw.init = &(struct clk_init_data) {
+		.name = "pwrcl_alt_pll",
+		.parent_names = (const char *[]){ "xo" },
+		.num_parents = 1,
+		.ops = &clk_alpha_pll_hwfsm_ops,
+	},
+};
+
+/* Mux'es */
+
+struct clk_cpu_8996_mux {
+	u32	reg;
+	u8	shift;
+	u8	width;
+	struct clk_hw	*pll;
+	struct clk_regmap clkr;
+};
+
+static inline
+struct clk_cpu_8996_mux *to_clk_cpu_8996_mux_hw(struct clk_hw *hw)
+{
+	return container_of(to_clk_regmap(hw), struct clk_cpu_8996_mux, clkr);
+}
+
+static u8 clk_cpu_8996_mux_get_parent(struct clk_hw *hw)
+{
+	u32 val;
+	struct clk_regmap *clkr = to_clk_regmap(hw);
+	struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_hw(hw);
+	u32 mask = (u32)GENMASK(cpuclk->width - 1, 0);
+
+	regmap_read(clkr->regmap, cpuclk->reg, &val);
+	val >>= (u32)(cpuclk->shift);
+
+	return (u8)(val & mask);
+}
+
+static int clk_cpu_8996_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+	u32 val;
+	struct clk_regmap *clkr = to_clk_regmap(hw);
+	struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_hw(hw);
+	unsigned int mask = GENMASK(cpuclk->width + cpuclk->shift - 1,
+				    cpuclk->shift);
+
+	val = (u32)index;
+	val <<= (u32)(cpuclk->shift);
+
+	return regmap_update_bits(clkr->regmap, cpuclk->reg, mask, val);
+}
+
+static int
+clk_cpu_8996_mux_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
+{
+	struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_hw(hw);
+	struct clk_hw *parent = cpuclk->pll;
+
+	req->best_parent_rate = clk_hw_round_rate(parent, req->rate);
+	req->best_parent_hw = parent;
+
+	return 0;
+}
+
+const struct clk_ops clk_cpu_8996_mux_ops = {
+	.set_parent = clk_cpu_8996_mux_set_parent,
+	.get_parent = clk_cpu_8996_mux_get_parent,
+	.determine_rate = clk_cpu_8996_mux_determine_rate,
+};
+
+static struct clk_cpu_8996_mux pwrcl_smux = {
+	.reg = 0x40,
+	.shift = 2,
+	.width = 2,
+	.clkr.hw.init = &(struct clk_init_data) {
+		.name = "pwrcl_smux",
+		.parent_names = (const char *[]){
+			"xo",
+			"pwrcl_pll_main",
+		},
+		.num_parents = 2,
+		.ops = &clk_cpu_8996_mux_ops,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_cpu_8996_mux perfcl_smux = {
+	.reg = 0x80040,
+	.shift = 2,
+	.width = 2,
+	.clkr.hw.init = &(struct clk_init_data) {
+		.name = "perfcl_smux",
+		.parent_names = (const char *[]){
+			"xo",
+			"perfcl_pll_main",
+		},
+		.num_parents = 2,
+		.ops = &clk_cpu_8996_mux_ops,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
+static struct clk_cpu_8996_mux pwrcl_pmux = {
+	.reg = 0x40,
+	.shift = 0,
+	.width = 2,
+	.pll = &pwrcl_pll.clkr.hw,
+	.clkr.hw.init = &(struct clk_init_data) {
+		.name = "pwrcl_pmux",
+		.parent_names = (const char *[]){
+			"pwrcl_smux",
+			"pwrcl_pll",
+			"pwrcl_pll_acd",
+			"pwrcl_alt_pll",
+		},
+		.num_parents = 4,
+		.ops = &clk_cpu_8996_mux_ops,
+		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+	},
+};
+
+static struct clk_cpu_8996_mux perfcl_pmux = {
+	.reg = 0x80040,
+	.shift = 0,
+	.width = 2,
+	.pll = &perfcl_pll.clkr.hw,
+	.clkr.hw.init = &(struct clk_init_data) {
+		.name = "perfcl_pmux",
+		.parent_names = (const char *[]){
+			"perfcl_smux",
+			"perfcl_pll",
+			"perfcl_pll_acd",
+			"perfcl_alt_pll",
+		},
+		.num_parents = 4,
+		.ops = &clk_cpu_8996_mux_ops,
+		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+	},
+};
+
+static const struct regmap_config cpu_msm8996_regmap_config = {
+	.reg_bits		= 32,
+	.reg_stride		= 4,
+	.val_bits		= 32,
+	.max_register		= 0x80210,
+	.fast_io		= true,
+	.val_format_endian	= REGMAP_ENDIAN_LITTLE,
+};
+
+struct clk_regmap *clks[] = {
+	&perfcl_pll.clkr,
+	&pwrcl_pll.clkr,
+	&perfcl_alt_pll.clkr,
+	&pwrcl_alt_pll.clkr,
+	&perfcl_smux.clkr,
+	&pwrcl_smux.clkr,
+	&perfcl_pmux.clkr,
+	&pwrcl_pmux.clkr,
+};
+
+static int
+qcom_cpu_clk_msm8996_register_clks(struct device *dev, struct regmap *regmap)
+{
+	int i, ret;
+
+	perfcl_smux.pll = clk_hw_register_fixed_factor(dev, "perfcl_pll_main",
+						       "perfcl_pll",
+						   CLK_SET_RATE_PARENT, 1, 2);
+
+	pwrcl_smux.pll = clk_hw_register_fixed_factor(dev, "pwrcl_pll_main",
+						      "pwrcl_pll",
+						   CLK_SET_RATE_PARENT, 1, 2);
+
+	for (i = 0; i < ARRAY_SIZE(clks); i++) {
+		ret = devm_clk_register_regmap(dev, clks[i]);
+		if (ret)
+			return ret;
+	}
+
+	clk_alpha_pll_configure(&perfcl_pll, regmap, &hfpll_config);
+	clk_alpha_pll_configure(&pwrcl_pll, regmap, &hfpll_config);
+	clk_alpha_pll_configure(&perfcl_alt_pll, regmap, &altpll_config);
+	clk_alpha_pll_configure(&pwrcl_alt_pll, regmap, &altpll_config);
+
+	return ret;
+}
+
+static int qcom_cpu_clk_msm8996_driver_probe(struct platform_device *pdev)
+{
+	int ret;
+	void __iomem *base;
+	struct resource *res;
+	struct regmap *regmap;
+	struct clk_hw_onecell_data *data;
+	struct device *dev = &pdev->dev;
+
+	data = devm_kzalloc(dev, sizeof(*data) + 2 * sizeof(struct clk_hw *),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	regmap = devm_regmap_init_mmio(dev, base, &cpu_msm8996_regmap_config);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	ret = qcom_cpu_clk_msm8996_register_clks(dev, regmap);
+	if (ret)
+		return ret;
+
+	data->hws[0] = &pwrcl_pmux.clkr.hw;
+	data->hws[1] = &perfcl_pmux.clkr.hw;
+	data->num = 2;
+
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, data);
+}
+
+static const struct of_device_id qcom_cpu_clk_msm8996_match_table[] = {
+	{ .compatible = "qcom,msm8996-apcc" },
+	{}
+};
+
+static struct platform_driver qcom_cpu_clk_msm8996_driver = {
+	.probe = qcom_cpu_clk_msm8996_driver_probe,
+	.driver = {
+		.name = "qcom-msm8996-apcc",
+		.of_match_table = qcom_cpu_clk_msm8996_match_table,
+	},
+};
+module_platform_driver(qcom_cpu_clk_msm8996_driver);
+
+MODULE_ALIAS("platform:msm8996-apcc");
+MODULE_DESCRIPTION("QCOM MSM8996 CPU Clock Driver");
+MODULE_LICENSE("GPL v2");