diff options
Diffstat (limited to 'drivers/clk/x86/clk-cgu.c')
| -rw-r--r-- | drivers/clk/x86/clk-cgu.c | 582 |
1 files changed, 582 insertions, 0 deletions
diff --git a/drivers/clk/x86/clk-cgu.c b/drivers/clk/x86/clk-cgu.c new file mode 100644 index 000000000..89b53f280 --- /dev/null +++ b/drivers/clk/x86/clk-cgu.c @@ -0,0 +1,582 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2022 MaxLinear, Inc. + * Copyright (C) 2020 Intel Corporation. + * Zhu Yixin <yzhu@maxlinear.com> + * Rahul Tanwar <rtanwar@maxlinear.com> + */ +#include <linux/clk-provider.h> +#include <linux/device.h> +#include <linux/of.h> + +#include "clk-cgu.h" + +#define GATE_HW_REG_STAT(reg) ((reg) + 0x0) +#define GATE_HW_REG_EN(reg) ((reg) + 0x4) +#define GATE_HW_REG_DIS(reg) ((reg) + 0x8) +#define MAX_DDIV_REG 8 +#define MAX_DIVIDER_VAL 64 + +#define to_lgm_clk_mux(_hw) container_of(_hw, struct lgm_clk_mux, hw) +#define to_lgm_clk_divider(_hw) container_of(_hw, struct lgm_clk_divider, hw) +#define to_lgm_clk_gate(_hw) container_of(_hw, struct lgm_clk_gate, hw) +#define to_lgm_clk_ddiv(_hw) container_of(_hw, struct lgm_clk_ddiv, hw) + +static struct clk_hw *lgm_clk_register_fixed(struct lgm_clk_provider *ctx, + const struct lgm_clk_branch *list) +{ + + if (list->div_flags & CLOCK_FLAG_VAL_INIT) + lgm_set_clk_val(ctx->membase, list->div_off, list->div_shift, + list->div_width, list->div_val); + + return clk_hw_register_fixed_rate(NULL, list->name, + list->parent_data[0].name, + list->flags, list->mux_flags); +} + +static u8 lgm_clk_mux_get_parent(struct clk_hw *hw) +{ + struct lgm_clk_mux *mux = to_lgm_clk_mux(hw); + u32 val; + + if (mux->flags & MUX_CLK_SW) + val = mux->reg; + else + val = lgm_get_clk_val(mux->membase, mux->reg, mux->shift, + mux->width); + return clk_mux_val_to_index(hw, NULL, mux->flags, val); +} + +static int lgm_clk_mux_set_parent(struct clk_hw *hw, u8 index) +{ + struct lgm_clk_mux *mux = to_lgm_clk_mux(hw); + u32 val; + + val = clk_mux_index_to_val(NULL, mux->flags, index); + if (mux->flags & MUX_CLK_SW) + mux->reg = val; + else + lgm_set_clk_val(mux->membase, mux->reg, mux->shift, + mux->width, val); + + return 0; +} + +static int lgm_clk_mux_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct lgm_clk_mux *mux = to_lgm_clk_mux(hw); + + return clk_mux_determine_rate_flags(hw, req, mux->flags); +} + +static const struct clk_ops lgm_clk_mux_ops = { + .get_parent = lgm_clk_mux_get_parent, + .set_parent = lgm_clk_mux_set_parent, + .determine_rate = lgm_clk_mux_determine_rate, +}; + +static struct clk_hw * +lgm_clk_register_mux(struct lgm_clk_provider *ctx, + const struct lgm_clk_branch *list) +{ + unsigned long cflags = list->mux_flags; + struct device *dev = ctx->dev; + u8 shift = list->mux_shift; + u8 width = list->mux_width; + struct clk_init_data init = {}; + struct lgm_clk_mux *mux; + u32 reg = list->mux_off; + struct clk_hw *hw; + int ret; + + mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL); + if (!mux) + return ERR_PTR(-ENOMEM); + + init.name = list->name; + init.ops = &lgm_clk_mux_ops; + init.flags = list->flags; + init.parent_data = list->parent_data; + init.num_parents = list->num_parents; + + mux->membase = ctx->membase; + mux->reg = reg; + mux->shift = shift; + mux->width = width; + mux->flags = cflags; + mux->hw.init = &init; + + hw = &mux->hw; + ret = devm_clk_hw_register(dev, hw); + if (ret) + return ERR_PTR(ret); + + if (cflags & CLOCK_FLAG_VAL_INIT) + lgm_set_clk_val(mux->membase, reg, shift, width, list->mux_val); + + return hw; +} + +static unsigned long +lgm_clk_divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct lgm_clk_divider *divider = to_lgm_clk_divider(hw); + unsigned int val; + + val = lgm_get_clk_val(divider->membase, divider->reg, + divider->shift, divider->width); + + return divider_recalc_rate(hw, parent_rate, val, divider->table, + divider->flags, divider->width); +} + +static long +lgm_clk_divider_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct lgm_clk_divider *divider = to_lgm_clk_divider(hw); + + return divider_round_rate(hw, rate, prate, divider->table, + divider->width, divider->flags); +} + +static int +lgm_clk_divider_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + struct lgm_clk_divider *divider = to_lgm_clk_divider(hw); + int value; + + value = divider_get_val(rate, prate, divider->table, + divider->width, divider->flags); + if (value < 0) + return value; + + lgm_set_clk_val(divider->membase, divider->reg, + divider->shift, divider->width, value); + + return 0; +} + +static int lgm_clk_divider_enable_disable(struct clk_hw *hw, int enable) +{ + struct lgm_clk_divider *div = to_lgm_clk_divider(hw); + + if (div->flags != DIV_CLK_NO_MASK) + lgm_set_clk_val(div->membase, div->reg, div->shift_gate, + div->width_gate, enable); + return 0; +} + +static int lgm_clk_divider_enable(struct clk_hw *hw) +{ + return lgm_clk_divider_enable_disable(hw, 1); +} + +static void lgm_clk_divider_disable(struct clk_hw *hw) +{ + lgm_clk_divider_enable_disable(hw, 0); +} + +static const struct clk_ops lgm_clk_divider_ops = { + .recalc_rate = lgm_clk_divider_recalc_rate, + .round_rate = lgm_clk_divider_round_rate, + .set_rate = lgm_clk_divider_set_rate, + .enable = lgm_clk_divider_enable, + .disable = lgm_clk_divider_disable, +}; + +static struct clk_hw * +lgm_clk_register_divider(struct lgm_clk_provider *ctx, + const struct lgm_clk_branch *list) +{ + unsigned long cflags = list->div_flags; + struct device *dev = ctx->dev; + struct lgm_clk_divider *div; + struct clk_init_data init = {}; + u8 shift = list->div_shift; + u8 width = list->div_width; + u8 shift_gate = list->div_shift_gate; + u8 width_gate = list->div_width_gate; + u32 reg = list->div_off; + struct clk_hw *hw; + int ret; + + div = devm_kzalloc(dev, sizeof(*div), GFP_KERNEL); + if (!div) + return ERR_PTR(-ENOMEM); + + init.name = list->name; + init.ops = &lgm_clk_divider_ops; + init.flags = list->flags; + init.parent_data = list->parent_data; + init.num_parents = 1; + + div->membase = ctx->membase; + div->reg = reg; + div->shift = shift; + div->width = width; + div->shift_gate = shift_gate; + div->width_gate = width_gate; + div->flags = cflags; + div->table = list->div_table; + div->hw.init = &init; + + hw = &div->hw; + ret = devm_clk_hw_register(dev, hw); + if (ret) + return ERR_PTR(ret); + + if (cflags & CLOCK_FLAG_VAL_INIT) + lgm_set_clk_val(div->membase, reg, shift, width, list->div_val); + + return hw; +} + +static struct clk_hw * +lgm_clk_register_fixed_factor(struct lgm_clk_provider *ctx, + const struct lgm_clk_branch *list) +{ + struct clk_hw *hw; + + hw = clk_hw_register_fixed_factor(ctx->dev, list->name, + list->parent_data[0].name, list->flags, + list->mult, list->div); + if (IS_ERR(hw)) + return ERR_CAST(hw); + + if (list->div_flags & CLOCK_FLAG_VAL_INIT) + lgm_set_clk_val(ctx->membase, list->div_off, list->div_shift, + list->div_width, list->div_val); + + return hw; +} + +static int lgm_clk_gate_enable(struct clk_hw *hw) +{ + struct lgm_clk_gate *gate = to_lgm_clk_gate(hw); + unsigned int reg; + + reg = GATE_HW_REG_EN(gate->reg); + lgm_set_clk_val(gate->membase, reg, gate->shift, 1, 1); + + return 0; +} + +static void lgm_clk_gate_disable(struct clk_hw *hw) +{ + struct lgm_clk_gate *gate = to_lgm_clk_gate(hw); + unsigned int reg; + + reg = GATE_HW_REG_DIS(gate->reg); + lgm_set_clk_val(gate->membase, reg, gate->shift, 1, 1); +} + +static int lgm_clk_gate_is_enabled(struct clk_hw *hw) +{ + struct lgm_clk_gate *gate = to_lgm_clk_gate(hw); + unsigned int reg, ret; + + reg = GATE_HW_REG_STAT(gate->reg); + ret = lgm_get_clk_val(gate->membase, reg, gate->shift, 1); + + return ret; +} + +static const struct clk_ops lgm_clk_gate_ops = { + .enable = lgm_clk_gate_enable, + .disable = lgm_clk_gate_disable, + .is_enabled = lgm_clk_gate_is_enabled, +}; + +static struct clk_hw * +lgm_clk_register_gate(struct lgm_clk_provider *ctx, + const struct lgm_clk_branch *list) +{ + unsigned long cflags = list->gate_flags; + const char *pname = list->parent_data[0].name; + struct device *dev = ctx->dev; + u8 shift = list->gate_shift; + struct clk_init_data init = {}; + struct lgm_clk_gate *gate; + u32 reg = list->gate_off; + struct clk_hw *hw; + int ret; + + gate = devm_kzalloc(dev, sizeof(*gate), GFP_KERNEL); + if (!gate) + return ERR_PTR(-ENOMEM); + + init.name = list->name; + init.ops = &lgm_clk_gate_ops; + init.flags = list->flags; + init.parent_names = pname ? &pname : NULL; + init.num_parents = pname ? 1 : 0; + + gate->membase = ctx->membase; + gate->reg = reg; + gate->shift = shift; + gate->flags = cflags; + gate->hw.init = &init; + + hw = &gate->hw; + ret = devm_clk_hw_register(dev, hw); + if (ret) + return ERR_PTR(ret); + + if (cflags & CLOCK_FLAG_VAL_INIT) { + lgm_set_clk_val(gate->membase, reg, shift, 1, list->gate_val); + } + + return hw; +} + +int lgm_clk_register_branches(struct lgm_clk_provider *ctx, + const struct lgm_clk_branch *list, + unsigned int nr_clk) +{ + struct clk_hw *hw; + unsigned int idx; + + for (idx = 0; idx < nr_clk; idx++, list++) { + switch (list->type) { + case CLK_TYPE_FIXED: + hw = lgm_clk_register_fixed(ctx, list); + break; + case CLK_TYPE_MUX: + hw = lgm_clk_register_mux(ctx, list); + break; + case CLK_TYPE_DIVIDER: + hw = lgm_clk_register_divider(ctx, list); + break; + case CLK_TYPE_FIXED_FACTOR: + hw = lgm_clk_register_fixed_factor(ctx, list); + break; + case CLK_TYPE_GATE: + if (list->gate_flags & GATE_CLK_HW) { + hw = lgm_clk_register_gate(ctx, list); + } else { + /* + * GATE_CLKs can be controlled either from + * CGU clk driver i.e. this driver or directly + * from power management driver/daemon. It is + * dependent on the power policy/profile requirements + * of the end product. To override control of gate + * clks from this driver, provide NULL for this index + * of gate clk provider. + */ + hw = NULL; + } + break; + + default: + dev_err(ctx->dev, "invalid clk type\n"); + return -EINVAL; + } + + if (IS_ERR(hw)) { + dev_err(ctx->dev, + "register clk: %s, type: %u failed!\n", + list->name, list->type); + return -EIO; + } + ctx->clk_data.hws[list->id] = hw; + } + + return 0; +} + +static unsigned long +lgm_clk_ddiv_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct lgm_clk_ddiv *ddiv = to_lgm_clk_ddiv(hw); + unsigned int div0, div1, exdiv; + u64 prate; + + div0 = lgm_get_clk_val(ddiv->membase, ddiv->reg, + ddiv->shift0, ddiv->width0) + 1; + div1 = lgm_get_clk_val(ddiv->membase, ddiv->reg, + ddiv->shift1, ddiv->width1) + 1; + exdiv = lgm_get_clk_val(ddiv->membase, ddiv->reg, + ddiv->shift2, ddiv->width2); + prate = (u64)parent_rate; + do_div(prate, div0); + do_div(prate, div1); + + if (exdiv) { + do_div(prate, ddiv->div); + prate *= ddiv->mult; + } + + return prate; +} + +static int lgm_clk_ddiv_enable(struct clk_hw *hw) +{ + struct lgm_clk_ddiv *ddiv = to_lgm_clk_ddiv(hw); + + lgm_set_clk_val(ddiv->membase, ddiv->reg, ddiv->shift_gate, + ddiv->width_gate, 1); + return 0; +} + +static void lgm_clk_ddiv_disable(struct clk_hw *hw) +{ + struct lgm_clk_ddiv *ddiv = to_lgm_clk_ddiv(hw); + + lgm_set_clk_val(ddiv->membase, ddiv->reg, ddiv->shift_gate, + ddiv->width_gate, 0); +} + +static int +lgm_clk_get_ddiv_val(u32 div, u32 *ddiv1, u32 *ddiv2) +{ + u32 idx, temp; + + *ddiv1 = 1; + *ddiv2 = 1; + + if (div > MAX_DIVIDER_VAL) + div = MAX_DIVIDER_VAL; + + if (div > 1) { + for (idx = 2; idx <= MAX_DDIV_REG; idx++) { + temp = DIV_ROUND_UP_ULL((u64)div, idx); + if (div % idx == 0 && temp <= MAX_DDIV_REG) + break; + } + + if (idx > MAX_DDIV_REG) + return -EINVAL; + + *ddiv1 = temp; + *ddiv2 = idx; + } + + return 0; +} + +static int +lgm_clk_ddiv_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + struct lgm_clk_ddiv *ddiv = to_lgm_clk_ddiv(hw); + u32 div, ddiv1, ddiv2; + + div = DIV_ROUND_CLOSEST_ULL((u64)prate, rate); + + if (lgm_get_clk_val(ddiv->membase, ddiv->reg, ddiv->shift2, 1)) { + div = DIV_ROUND_CLOSEST_ULL((u64)div, 5); + div = div * 2; + } + + if (div <= 0) + return -EINVAL; + + if (lgm_clk_get_ddiv_val(div, &ddiv1, &ddiv2)) + return -EINVAL; + + lgm_set_clk_val(ddiv->membase, ddiv->reg, ddiv->shift0, ddiv->width0, + ddiv1 - 1); + + lgm_set_clk_val(ddiv->membase, ddiv->reg, ddiv->shift1, ddiv->width1, + ddiv2 - 1); + + return 0; +} + +static long +lgm_clk_ddiv_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct lgm_clk_ddiv *ddiv = to_lgm_clk_ddiv(hw); + u32 div, ddiv1, ddiv2; + u64 rate64; + + div = DIV_ROUND_CLOSEST_ULL((u64)*prate, rate); + + /* if predivide bit is enabled, modify div by factor of 2.5 */ + if (lgm_get_clk_val(ddiv->membase, ddiv->reg, ddiv->shift2, 1)) { + div = div * 2; + div = DIV_ROUND_CLOSEST_ULL((u64)div, 5); + } + + if (div <= 0) + return *prate; + + if (lgm_clk_get_ddiv_val(div, &ddiv1, &ddiv2) != 0) + if (lgm_clk_get_ddiv_val(div + 1, &ddiv1, &ddiv2) != 0) + return -EINVAL; + + rate64 = *prate; + do_div(rate64, ddiv1); + do_div(rate64, ddiv2); + + /* if predivide bit is enabled, modify rounded rate by factor of 2.5 */ + if (lgm_get_clk_val(ddiv->membase, ddiv->reg, ddiv->shift2, 1)) { + rate64 = rate64 * 2; + rate64 = DIV_ROUND_CLOSEST_ULL(rate64, 5); + } + + return rate64; +} + +static const struct clk_ops lgm_clk_ddiv_ops = { + .recalc_rate = lgm_clk_ddiv_recalc_rate, + .enable = lgm_clk_ddiv_enable, + .disable = lgm_clk_ddiv_disable, + .set_rate = lgm_clk_ddiv_set_rate, + .round_rate = lgm_clk_ddiv_round_rate, +}; + +int lgm_clk_register_ddiv(struct lgm_clk_provider *ctx, + const struct lgm_clk_ddiv_data *list, + unsigned int nr_clk) +{ + struct device *dev = ctx->dev; + struct clk_hw *hw; + unsigned int idx; + int ret; + + for (idx = 0; idx < nr_clk; idx++, list++) { + struct clk_init_data init = {}; + struct lgm_clk_ddiv *ddiv; + + ddiv = devm_kzalloc(dev, sizeof(*ddiv), GFP_KERNEL); + if (!ddiv) + return -ENOMEM; + + init.name = list->name; + init.ops = &lgm_clk_ddiv_ops; + init.flags = list->flags; + init.parent_data = list->parent_data; + init.num_parents = 1; + + ddiv->membase = ctx->membase; + ddiv->reg = list->reg; + ddiv->shift0 = list->shift0; + ddiv->width0 = list->width0; + ddiv->shift1 = list->shift1; + ddiv->width1 = list->width1; + ddiv->shift_gate = list->shift_gate; + ddiv->width_gate = list->width_gate; + ddiv->shift2 = list->ex_shift; + ddiv->width2 = list->ex_width; + ddiv->flags = list->div_flags; + ddiv->mult = 2; + ddiv->div = 5; + ddiv->hw.init = &init; + + hw = &ddiv->hw; + ret = devm_clk_hw_register(dev, hw); + if (ret) { + dev_err(dev, "register clk: %s failed!\n", list->name); + return ret; + } + ctx->clk_data.hws[list->id] = hw; + } + + return 0; +} |