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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/clk/ux500/clk-prcmu.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/clk/ux500/clk-prcmu.c')
-rw-r--r-- | drivers/clk/ux500/clk-prcmu.c | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/drivers/clk/ux500/clk-prcmu.c b/drivers/clk/ux500/clk-prcmu.c new file mode 100644 index 0000000000..5cbf24c946 --- /dev/null +++ b/drivers/clk/ux500/clk-prcmu.c @@ -0,0 +1,401 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * PRCMU clock implementation for ux500 platform. + * + * Copyright (C) 2012 ST-Ericsson SA + * Author: Ulf Hansson <ulf.hansson@linaro.org> + */ + +#include <linux/clk-provider.h> +#include <linux/mfd/dbx500-prcmu.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <linux/err.h> +#include "clk.h" + +#define to_clk_prcmu(_hw) container_of(_hw, struct clk_prcmu, hw) +#define to_clk_prcmu_clkout(_hw) container_of(_hw, struct clk_prcmu_clkout, hw) + +struct clk_prcmu { + struct clk_hw hw; + u8 cg_sel; + int opp_requested; +}; + +struct clk_prcmu_clkout { + struct clk_hw hw; + u8 clkout_id; + u8 source; + u8 divider; +}; + +/* PRCMU clock operations. */ + +static int clk_prcmu_prepare(struct clk_hw *hw) +{ + struct clk_prcmu *clk = to_clk_prcmu(hw); + + return prcmu_request_clock(clk->cg_sel, true); +} + +static void clk_prcmu_unprepare(struct clk_hw *hw) +{ + struct clk_prcmu *clk = to_clk_prcmu(hw); + if (prcmu_request_clock(clk->cg_sel, false)) + pr_err("clk_prcmu: %s failed to disable %s.\n", __func__, + clk_hw_get_name(hw)); +} + +static unsigned long clk_prcmu_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_prcmu *clk = to_clk_prcmu(hw); + return prcmu_clock_rate(clk->cg_sel); +} + +static long clk_prcmu_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct clk_prcmu *clk = to_clk_prcmu(hw); + return prcmu_round_clock_rate(clk->cg_sel, rate); +} + +static int clk_prcmu_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_prcmu *clk = to_clk_prcmu(hw); + return prcmu_set_clock_rate(clk->cg_sel, rate); +} + +static int clk_prcmu_opp_prepare(struct clk_hw *hw) +{ + int err; + struct clk_prcmu *clk = to_clk_prcmu(hw); + + if (!clk->opp_requested) { + err = prcmu_qos_add_requirement(PRCMU_QOS_APE_OPP, + (char *)clk_hw_get_name(hw), + 100); + if (err) { + pr_err("clk_prcmu: %s fail req APE OPP for %s.\n", + __func__, clk_hw_get_name(hw)); + return err; + } + clk->opp_requested = 1; + } + + err = prcmu_request_clock(clk->cg_sel, true); + if (err) { + prcmu_qos_remove_requirement(PRCMU_QOS_APE_OPP, + (char *)clk_hw_get_name(hw)); + clk->opp_requested = 0; + return err; + } + + return 0; +} + +static void clk_prcmu_opp_unprepare(struct clk_hw *hw) +{ + struct clk_prcmu *clk = to_clk_prcmu(hw); + + if (prcmu_request_clock(clk->cg_sel, false)) { + pr_err("clk_prcmu: %s failed to disable %s.\n", __func__, + clk_hw_get_name(hw)); + return; + } + + if (clk->opp_requested) { + prcmu_qos_remove_requirement(PRCMU_QOS_APE_OPP, + (char *)clk_hw_get_name(hw)); + clk->opp_requested = 0; + } +} + +static int clk_prcmu_opp_volt_prepare(struct clk_hw *hw) +{ + int err; + struct clk_prcmu *clk = to_clk_prcmu(hw); + + if (!clk->opp_requested) { + err = prcmu_request_ape_opp_100_voltage(true); + if (err) { + pr_err("clk_prcmu: %s fail req APE OPP VOLT for %s.\n", + __func__, clk_hw_get_name(hw)); + return err; + } + clk->opp_requested = 1; + } + + err = prcmu_request_clock(clk->cg_sel, true); + if (err) { + prcmu_request_ape_opp_100_voltage(false); + clk->opp_requested = 0; + return err; + } + + return 0; +} + +static void clk_prcmu_opp_volt_unprepare(struct clk_hw *hw) +{ + struct clk_prcmu *clk = to_clk_prcmu(hw); + + if (prcmu_request_clock(clk->cg_sel, false)) { + pr_err("clk_prcmu: %s failed to disable %s.\n", __func__, + clk_hw_get_name(hw)); + return; + } + + if (clk->opp_requested) { + prcmu_request_ape_opp_100_voltage(false); + clk->opp_requested = 0; + } +} + +static const struct clk_ops clk_prcmu_scalable_ops = { + .prepare = clk_prcmu_prepare, + .unprepare = clk_prcmu_unprepare, + .recalc_rate = clk_prcmu_recalc_rate, + .round_rate = clk_prcmu_round_rate, + .set_rate = clk_prcmu_set_rate, +}; + +static const struct clk_ops clk_prcmu_gate_ops = { + .prepare = clk_prcmu_prepare, + .unprepare = clk_prcmu_unprepare, + .recalc_rate = clk_prcmu_recalc_rate, +}; + +static const struct clk_ops clk_prcmu_scalable_rate_ops = { + .recalc_rate = clk_prcmu_recalc_rate, + .round_rate = clk_prcmu_round_rate, + .set_rate = clk_prcmu_set_rate, +}; + +static const struct clk_ops clk_prcmu_rate_ops = { + .recalc_rate = clk_prcmu_recalc_rate, +}; + +static const struct clk_ops clk_prcmu_opp_gate_ops = { + .prepare = clk_prcmu_opp_prepare, + .unprepare = clk_prcmu_opp_unprepare, + .recalc_rate = clk_prcmu_recalc_rate, +}; + +static const struct clk_ops clk_prcmu_opp_volt_scalable_ops = { + .prepare = clk_prcmu_opp_volt_prepare, + .unprepare = clk_prcmu_opp_volt_unprepare, + .recalc_rate = clk_prcmu_recalc_rate, + .round_rate = clk_prcmu_round_rate, + .set_rate = clk_prcmu_set_rate, +}; + +static struct clk_hw *clk_reg_prcmu(const char *name, + const char *parent_name, + u8 cg_sel, + unsigned long rate, + unsigned long flags, + const struct clk_ops *clk_prcmu_ops) +{ + struct clk_prcmu *clk; + struct clk_init_data clk_prcmu_init; + int ret; + + if (!name) { + pr_err("clk_prcmu: %s invalid arguments passed\n", __func__); + return ERR_PTR(-EINVAL); + } + + clk = kzalloc(sizeof(*clk), GFP_KERNEL); + if (!clk) + return ERR_PTR(-ENOMEM); + + clk->cg_sel = cg_sel; + clk->opp_requested = 0; + /* "rate" can be used for changing the initial frequency */ + if (rate) + prcmu_set_clock_rate(cg_sel, rate); + + clk_prcmu_init.name = name; + clk_prcmu_init.ops = clk_prcmu_ops; + clk_prcmu_init.flags = flags; + clk_prcmu_init.parent_names = (parent_name ? &parent_name : NULL); + clk_prcmu_init.num_parents = (parent_name ? 1 : 0); + clk->hw.init = &clk_prcmu_init; + + ret = clk_hw_register(NULL, &clk->hw); + if (ret) + goto free_clk; + + return &clk->hw; + +free_clk: + kfree(clk); + pr_err("clk_prcmu: %s failed to register clk\n", __func__); + return ERR_PTR(-ENOMEM); +} + +struct clk_hw *clk_reg_prcmu_scalable(const char *name, + const char *parent_name, + u8 cg_sel, + unsigned long rate, + unsigned long flags) +{ + return clk_reg_prcmu(name, parent_name, cg_sel, rate, flags, + &clk_prcmu_scalable_ops); +} + +struct clk_hw *clk_reg_prcmu_gate(const char *name, + const char *parent_name, + u8 cg_sel, + unsigned long flags) +{ + return clk_reg_prcmu(name, parent_name, cg_sel, 0, flags, + &clk_prcmu_gate_ops); +} + +struct clk_hw *clk_reg_prcmu_scalable_rate(const char *name, + const char *parent_name, + u8 cg_sel, + unsigned long rate, + unsigned long flags) +{ + return clk_reg_prcmu(name, parent_name, cg_sel, rate, flags, + &clk_prcmu_scalable_rate_ops); +} + +struct clk_hw *clk_reg_prcmu_rate(const char *name, + const char *parent_name, + u8 cg_sel, + unsigned long flags) +{ + return clk_reg_prcmu(name, parent_name, cg_sel, 0, flags, + &clk_prcmu_rate_ops); +} + +struct clk_hw *clk_reg_prcmu_opp_gate(const char *name, + const char *parent_name, + u8 cg_sel, + unsigned long flags) +{ + return clk_reg_prcmu(name, parent_name, cg_sel, 0, flags, + &clk_prcmu_opp_gate_ops); +} + +struct clk_hw *clk_reg_prcmu_opp_volt_scalable(const char *name, + const char *parent_name, + u8 cg_sel, + unsigned long rate, + unsigned long flags) +{ + return clk_reg_prcmu(name, parent_name, cg_sel, rate, flags, + &clk_prcmu_opp_volt_scalable_ops); +} + +/* The clkout (external) clock is special and need special ops */ + +static int clk_prcmu_clkout_prepare(struct clk_hw *hw) +{ + struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw); + + return prcmu_config_clkout(clk->clkout_id, clk->source, clk->divider); +} + +static void clk_prcmu_clkout_unprepare(struct clk_hw *hw) +{ + struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw); + int ret; + + /* The clkout clock is disabled by dividing by 0 */ + ret = prcmu_config_clkout(clk->clkout_id, clk->source, 0); + if (ret) + pr_err("clk_prcmu: %s failed to disable %s\n", __func__, + clk_hw_get_name(hw)); +} + +static unsigned long clk_prcmu_clkout_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw); + + return (parent_rate / clk->divider); +} + +static u8 clk_prcmu_clkout_get_parent(struct clk_hw *hw) +{ + struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw); + + return clk->source; +} + +static int clk_prcmu_clkout_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw); + + clk->source = index; + /* Make sure the change reaches the hardware immediately */ + if (clk_hw_is_prepared(hw)) + return clk_prcmu_clkout_prepare(hw); + return 0; +} + +static const struct clk_ops clk_prcmu_clkout_ops = { + .prepare = clk_prcmu_clkout_prepare, + .unprepare = clk_prcmu_clkout_unprepare, + .recalc_rate = clk_prcmu_clkout_recalc_rate, + .determine_rate = clk_hw_determine_rate_no_reparent, + .get_parent = clk_prcmu_clkout_get_parent, + .set_parent = clk_prcmu_clkout_set_parent, +}; + +struct clk_hw *clk_reg_prcmu_clkout(const char *name, + const char * const *parent_names, + int num_parents, + u8 source, u8 divider) + +{ + struct clk_prcmu_clkout *clk; + struct clk_init_data clk_prcmu_clkout_init; + u8 clkout_id; + int ret; + + if (!name) { + pr_err("clk_prcmu_clkout: %s invalid arguments passed\n", __func__); + return ERR_PTR(-EINVAL); + } + + if (!strcmp(name, "clkout1")) + clkout_id = 0; + else if (!strcmp(name, "clkout2")) + clkout_id = 1; + else { + pr_err("clk_prcmu_clkout: %s bad clock name\n", __func__); + return ERR_PTR(-EINVAL); + } + + clk = kzalloc(sizeof(*clk), GFP_KERNEL); + if (!clk) + return ERR_PTR(-ENOMEM); + + clk->clkout_id = clkout_id; + clk->source = source; + clk->divider = divider; + + clk_prcmu_clkout_init.name = name; + clk_prcmu_clkout_init.ops = &clk_prcmu_clkout_ops; + clk_prcmu_clkout_init.flags = CLK_GET_RATE_NOCACHE; + clk_prcmu_clkout_init.parent_names = parent_names; + clk_prcmu_clkout_init.num_parents = num_parents; + clk->hw.init = &clk_prcmu_clkout_init; + + ret = clk_hw_register(NULL, &clk->hw); + if (ret) + goto free_clkout; + + return &clk->hw; +free_clkout: + kfree(clk); + pr_err("clk_prcmu_clkout: %s failed to register clk\n", __func__); + return ERR_PTR(-ENOMEM); +} |