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path: root/drivers/clk/x86/clk-cgu.c
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-rw-r--r--drivers/clk/x86/clk-cgu.c582
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 0000000000..89b53f280a
--- /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;
+}