diff options
Diffstat (limited to 'drivers/clk/samsung/clk.c')
| -rw-r--r-- | drivers/clk/samsung/clk.c | 118 |
1 files changed, 57 insertions, 61 deletions
diff --git a/drivers/clk/samsung/clk.c b/drivers/clk/samsung/clk.c index 1f6e47cd327d..c149ca6c2217 100644 --- a/drivers/clk/samsung/clk.c +++ b/drivers/clk/samsung/clk.c @@ -1,20 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2013 Samsung Electronics Co., Ltd. * Copyright (c) 2013 Linaro Ltd. * Author: Thomas Abraham <thomas.ab@samsung.com> * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * * This file includes utility functions to register clocks to common * clock framework for Samsung platforms. -*/ + */ #include <linux/slab.h> #include <linux/clkdev.h> -#include <linux/clk.h> #include <linux/clk-provider.h> +#include <linux/io.h> +#include <linux/mod_devicetable.h> #include <linux/of_address.h> #include <linux/syscore_ops.h> @@ -55,23 +53,33 @@ struct samsung_clk_reg_dump *samsung_clk_alloc_reg_dump( return rd; } -/* setup the essentials required to support clock lookup using ccf */ -struct samsung_clk_provider *__init samsung_clk_init(struct device_node *np, +/** + * samsung_clk_init() - Create and initialize a clock provider object + * @dev: CMU device to enable runtime PM, or NULL if RPM is not needed + * @base: Start address (mapped) of CMU registers + * @nr_clks: Total clock count to allocate in clock provider object + * + * Setup the essentials required to support clock lookup using Common Clock + * Framework. + * + * Return: Allocated and initialized clock provider object. + */ +struct samsung_clk_provider * __init samsung_clk_init(struct device *dev, void __iomem *base, unsigned long nr_clks) { struct samsung_clk_provider *ctx; int i; - ctx = kzalloc(sizeof(struct samsung_clk_provider) + - sizeof(*ctx->clk_data.hws) * nr_clks, GFP_KERNEL); + ctx = kzalloc(struct_size(ctx, clk_data.hws, nr_clks), GFP_KERNEL); if (!ctx) panic("could not allocate clock provider context.\n"); + ctx->clk_data.num = nr_clks; for (i = 0; i < nr_clks; ++i) ctx->clk_data.hws[i] = ERR_PTR(-ENOENT); + ctx->dev = dev; ctx->reg_base = base; - ctx->clk_data.num = nr_clks; spin_lock_init(&ctx->lock); return ctx; @@ -131,7 +139,7 @@ void __init samsung_clk_register_fixed_rate(struct samsung_clk_provider *ctx, unsigned int nr_clk) { struct clk_hw *clk_hw; - unsigned int idx, ret; + unsigned int idx; for (idx = 0; idx < nr_clk; idx++, list++) { clk_hw = clk_hw_register_fixed_rate(ctx->dev, list->name, @@ -143,15 +151,6 @@ void __init samsung_clk_register_fixed_rate(struct samsung_clk_provider *ctx, } samsung_clk_add_lookup(ctx, clk_hw, list->id); - - /* - * Unconditionally add a clock lookup for the fixed rate clocks. - * There are not many of these on any of Samsung platforms. - */ - ret = clk_hw_register_clkdev(clk_hw, list->name, NULL); - if (ret) - pr_err("%s: failed to register clock lookup for %s", - __func__, list->name); } } @@ -271,22 +270,8 @@ void __init samsung_clk_of_register_fixed_ext(struct samsung_clk_provider *ctx, samsung_clk_register_fixed_rate(ctx, fixed_rate_clk, nr_fixed_rate_clk); } -/* utility function to get the rate of a specified clock */ -unsigned long _get_rate(const char *clk_name) -{ - struct clk *clk; - - clk = __clk_lookup(clk_name); - if (!clk) { - pr_err("%s: could not find clock %s\n", __func__, clk_name); - return 0; - } - - return clk_get_rate(clk); -} - #ifdef CONFIG_PM_SLEEP -static int samsung_clk_suspend(void) +static int samsung_clk_suspend(void *data) { struct samsung_clock_reg_cache *reg_cache; @@ -299,7 +284,7 @@ static int samsung_clk_suspend(void) return 0; } -static void samsung_clk_resume(void) +static void samsung_clk_resume(void *data) { struct samsung_clock_reg_cache *reg_cache; @@ -308,11 +293,15 @@ static void samsung_clk_resume(void) reg_cache->rd_num); } -static struct syscore_ops samsung_clk_syscore_ops = { +static const struct syscore_ops samsung_clk_syscore_ops = { .suspend = samsung_clk_suspend, .resume = samsung_clk_resume, }; +static struct syscore samsung_clk_syscore = { + .ops = &samsung_clk_syscore_ops, +}; + void samsung_clk_extended_sleep_init(void __iomem *reg_base, const unsigned long *rdump, unsigned long nr_rdump, @@ -331,7 +320,7 @@ void samsung_clk_extended_sleep_init(void __iomem *reg_base, panic("could not allocate register dump storage.\n"); if (list_empty(&clock_reg_cache_list)) - register_syscore_ops(&samsung_clk_syscore_ops); + register_syscore(&samsung_clk_syscore); reg_cache->reg_base = reg_base; reg_cache->rd_num = nr_rdump; @@ -341,6 +330,33 @@ void samsung_clk_extended_sleep_init(void __iomem *reg_base, } #endif +/** + * samsung_cmu_register_clocks() - Register all clocks provided in CMU object + * @ctx: Clock provider object + * @cmu: CMU object with clocks to register + */ +void __init samsung_cmu_register_clocks(struct samsung_clk_provider *ctx, + const struct samsung_cmu_info *cmu) +{ + if (cmu->pll_clks) + samsung_clk_register_pll(ctx, cmu->pll_clks, cmu->nr_pll_clks); + if (cmu->mux_clks) + samsung_clk_register_mux(ctx, cmu->mux_clks, cmu->nr_mux_clks); + if (cmu->div_clks) + samsung_clk_register_div(ctx, cmu->div_clks, cmu->nr_div_clks); + if (cmu->gate_clks) + samsung_clk_register_gate(ctx, cmu->gate_clks, + cmu->nr_gate_clks); + if (cmu->fixed_clks) + samsung_clk_register_fixed_rate(ctx, cmu->fixed_clks, + cmu->nr_fixed_clks); + if (cmu->fixed_factor_clks) + samsung_clk_register_fixed_factor(ctx, cmu->fixed_factor_clks, + cmu->nr_fixed_factor_clks); + if (cmu->cpu_clks) + samsung_clk_register_cpu(ctx, cmu->cpu_clks, cmu->nr_cpu_clks); +} + /* * Common function which registers plls, muxes, dividers and gates * for each CMU. It also add CMU register list to register cache. @@ -358,29 +374,9 @@ struct samsung_clk_provider * __init samsung_cmu_register_one( return NULL; } - ctx = samsung_clk_init(np, reg_base, cmu->nr_clk_ids); - if (!ctx) { - panic("%s: unable to allocate ctx\n", __func__); - return ctx; - } + ctx = samsung_clk_init(NULL, reg_base, cmu->nr_clk_ids); + samsung_cmu_register_clocks(ctx, cmu); - if (cmu->pll_clks) - samsung_clk_register_pll(ctx, cmu->pll_clks, cmu->nr_pll_clks, - reg_base); - if (cmu->mux_clks) - samsung_clk_register_mux(ctx, cmu->mux_clks, - cmu->nr_mux_clks); - if (cmu->div_clks) - samsung_clk_register_div(ctx, cmu->div_clks, cmu->nr_div_clks); - if (cmu->gate_clks) - samsung_clk_register_gate(ctx, cmu->gate_clks, - cmu->nr_gate_clks); - if (cmu->fixed_clks) - samsung_clk_register_fixed_rate(ctx, cmu->fixed_clks, - cmu->nr_fixed_clks); - if (cmu->fixed_factor_clks) - samsung_clk_register_fixed_factor(ctx, cmu->fixed_factor_clks, - cmu->nr_fixed_factor_clks); if (cmu->clk_regs) samsung_clk_extended_sleep_init(reg_base, cmu->clk_regs, cmu->nr_clk_regs, |