diff options
Diffstat (limited to 'drivers/clk/visconti/clkc.c')
| -rw-r--r-- | drivers/clk/visconti/clkc.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/drivers/clk/visconti/clkc.c b/drivers/clk/visconti/clkc.c new file mode 100644 index 000000000..d0b193b5d --- /dev/null +++ b/drivers/clk/visconti/clkc.c @@ -0,0 +1,206 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Toshiba Visconti clock controller + * + * Copyright (c) 2021 TOSHIBA CORPORATION + * Copyright (c) 2021 Toshiba Electronic Devices & Storage Corporation + * + * Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> + */ + +#include <linux/clk-provider.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/string.h> + +#include "clkc.h" + +static inline struct visconti_clk_gate *to_visconti_clk_gate(struct clk_hw *hw) +{ + return container_of(hw, struct visconti_clk_gate, hw); +} + +static int visconti_gate_clk_is_enabled(struct clk_hw *hw) +{ + struct visconti_clk_gate *gate = to_visconti_clk_gate(hw); + u32 clk = BIT(gate->ck_idx); + u32 val; + + regmap_read(gate->regmap, gate->ckon_offset, &val); + return (val & clk) ? 1 : 0; +} + +static void visconti_gate_clk_disable(struct clk_hw *hw) +{ + struct visconti_clk_gate *gate = to_visconti_clk_gate(hw); + u32 clk = BIT(gate->ck_idx); + unsigned long flags; + + spin_lock_irqsave(gate->lock, flags); + + if (!visconti_gate_clk_is_enabled(hw)) { + spin_unlock_irqrestore(gate->lock, flags); + return; + } + + regmap_update_bits(gate->regmap, gate->ckoff_offset, clk, clk); + spin_unlock_irqrestore(gate->lock, flags); +} + +static int visconti_gate_clk_enable(struct clk_hw *hw) +{ + struct visconti_clk_gate *gate = to_visconti_clk_gate(hw); + u32 clk = BIT(gate->ck_idx); + unsigned long flags; + + spin_lock_irqsave(gate->lock, flags); + regmap_update_bits(gate->regmap, gate->ckon_offset, clk, clk); + spin_unlock_irqrestore(gate->lock, flags); + + return 0; +} + +static const struct clk_ops visconti_clk_gate_ops = { + .enable = visconti_gate_clk_enable, + .disable = visconti_gate_clk_disable, + .is_enabled = visconti_gate_clk_is_enabled, +}; + +static struct clk_hw *visconti_clk_register_gate(struct device *dev, + const char *name, + const char *parent_name, + struct regmap *regmap, + const struct visconti_clk_gate_table *clks, + u32 rson_offset, + u32 rsoff_offset, + u8 rs_idx, + spinlock_t *lock) +{ + struct visconti_clk_gate *gate; + struct clk_parent_data *pdata; + struct clk_init_data init; + struct clk_hw *hw; + int ret; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + pdata->name = pdata->fw_name = parent_name; + + gate = devm_kzalloc(dev, sizeof(*gate), GFP_KERNEL); + if (!gate) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &visconti_clk_gate_ops; + init.flags = clks->flags; + init.parent_data = pdata; + init.num_parents = 1; + + gate->regmap = regmap; + gate->ckon_offset = clks->ckon_offset; + gate->ckoff_offset = clks->ckoff_offset; + gate->ck_idx = clks->ck_idx; + gate->rson_offset = rson_offset; + gate->rsoff_offset = rsoff_offset; + gate->rs_idx = rs_idx; + gate->lock = lock; + gate->hw.init = &init; + + hw = &gate->hw; + ret = devm_clk_hw_register(dev, hw); + if (ret) + hw = ERR_PTR(ret); + + return hw; +} + +int visconti_clk_register_gates(struct visconti_clk_provider *ctx, + const struct visconti_clk_gate_table *clks, + int num_gate, + const struct visconti_reset_data *reset, + spinlock_t *lock) +{ + struct device *dev = ctx->dev; + int i; + + for (i = 0; i < num_gate; i++) { + const char *parent_div_name = clks[i].parent_data[0].name; + struct clk_parent_data *pdata; + u32 rson_offset, rsoff_offset; + struct clk_hw *gate_clk; + struct clk_hw *div_clk; + char *dev_name; + u8 rs_idx; + + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + dev_name = devm_kasprintf(dev, GFP_KERNEL, "%s_div", clks[i].name); + if (!dev_name) + return -ENOMEM; + + if (clks[i].rs_id != NO_RESET) { + rson_offset = reset[clks[i].rs_id].rson_offset; + rsoff_offset = reset[clks[i].rs_id].rsoff_offset; + rs_idx = reset[clks[i].rs_id].rs_idx; + } else { + rson_offset = rsoff_offset = rs_idx = -1; + } + + div_clk = devm_clk_hw_register_fixed_factor(dev, + dev_name, + parent_div_name, + 0, 1, + clks[i].div); + if (IS_ERR(div_clk)) + return PTR_ERR(div_clk); + + gate_clk = visconti_clk_register_gate(dev, + clks[i].name, + dev_name, + ctx->regmap, + &clks[i], + rson_offset, + rsoff_offset, + rs_idx, + lock); + if (IS_ERR(gate_clk)) { + dev_err(dev, "%s: failed to register clock %s\n", + __func__, clks[i].name); + return PTR_ERR(gate_clk); + } + + ctx->clk_data.hws[clks[i].id] = gate_clk; + } + + return 0; +} + +struct visconti_clk_provider *visconti_init_clk(struct device *dev, + struct regmap *regmap, + unsigned long nr_clks) +{ + struct visconti_clk_provider *ctx; + int i; + + ctx = devm_kzalloc(dev, struct_size(ctx, clk_data.hws, nr_clks), GFP_KERNEL); + if (!ctx) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < nr_clks; ++i) + ctx->clk_data.hws[i] = ERR_PTR(-ENOENT); + ctx->clk_data.num = nr_clks; + + ctx->dev = dev; + ctx->regmap = regmap; + + return ctx; +} |