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720 lines
18 KiB
720 lines
18 KiB
/* |
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* SCI Clock driver for keystone based devices |
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* |
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* Copyright (C) 2015-2016 Texas Instruments Incorporated - https://www.ti.com/ |
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* Tero Kristo <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
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* kind, whether express or implied; without even the implied warranty |
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/soc/ti/ti_sci_protocol.h> |
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#include <linux/bsearch.h> |
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#include <linux/list_sort.h> |
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|
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#define SCI_CLK_SSC_ENABLE BIT(0) |
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#define SCI_CLK_ALLOW_FREQ_CHANGE BIT(1) |
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#define SCI_CLK_INPUT_TERMINATION BIT(2) |
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|
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/** |
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* struct sci_clk_provider - TI SCI clock provider representation |
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* @sci: Handle to the System Control Interface protocol handler |
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* @ops: Pointer to the SCI ops to be used by the clocks |
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* @dev: Device pointer for the clock provider |
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* @clocks: Clocks array for this device |
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* @num_clocks: Total number of clocks for this provider |
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*/ |
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struct sci_clk_provider { |
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const struct ti_sci_handle *sci; |
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const struct ti_sci_clk_ops *ops; |
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struct device *dev; |
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struct sci_clk **clocks; |
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int num_clocks; |
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}; |
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|
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/** |
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* struct sci_clk - TI SCI clock representation |
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* @hw: Hardware clock cookie for common clock framework |
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* @dev_id: Device index |
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* @clk_id: Clock index |
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* @num_parents: Number of parents for this clock |
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* @provider: Master clock provider |
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* @flags: Flags for the clock |
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* @node: Link for handling clocks probed via DT |
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* @cached_req: Cached requested freq for determine rate calls |
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* @cached_res: Cached result freq for determine rate calls |
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*/ |
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struct sci_clk { |
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struct clk_hw hw; |
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u16 dev_id; |
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u32 clk_id; |
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u32 num_parents; |
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struct sci_clk_provider *provider; |
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u8 flags; |
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struct list_head node; |
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unsigned long cached_req; |
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unsigned long cached_res; |
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}; |
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|
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#define to_sci_clk(_hw) container_of(_hw, struct sci_clk, hw) |
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|
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/** |
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* sci_clk_prepare - Prepare (enable) a TI SCI clock |
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* @hw: clock to prepare |
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* |
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* Prepares a clock to be actively used. Returns the SCI protocol status. |
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*/ |
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static int sci_clk_prepare(struct clk_hw *hw) |
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{ |
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struct sci_clk *clk = to_sci_clk(hw); |
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bool enable_ssc = clk->flags & SCI_CLK_SSC_ENABLE; |
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bool allow_freq_change = clk->flags & SCI_CLK_ALLOW_FREQ_CHANGE; |
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bool input_termination = clk->flags & SCI_CLK_INPUT_TERMINATION; |
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return clk->provider->ops->get_clock(clk->provider->sci, clk->dev_id, |
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clk->clk_id, enable_ssc, |
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allow_freq_change, |
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input_termination); |
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} |
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|
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/** |
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* sci_clk_unprepare - Un-prepares (disables) a TI SCI clock |
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* @hw: clock to unprepare |
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* |
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* Un-prepares a clock from active state. |
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*/ |
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static void sci_clk_unprepare(struct clk_hw *hw) |
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{ |
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struct sci_clk *clk = to_sci_clk(hw); |
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int ret; |
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ret = clk->provider->ops->put_clock(clk->provider->sci, clk->dev_id, |
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clk->clk_id); |
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if (ret) |
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dev_err(clk->provider->dev, |
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"unprepare failed for dev=%d, clk=%d, ret=%d\n", |
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clk->dev_id, clk->clk_id, ret); |
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} |
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|
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/** |
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* sci_clk_is_prepared - Check if a TI SCI clock is prepared or not |
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* @hw: clock to check status for |
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* |
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* Checks if a clock is prepared (enabled) in hardware. Returns non-zero |
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* value if clock is enabled, zero otherwise. |
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*/ |
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static int sci_clk_is_prepared(struct clk_hw *hw) |
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{ |
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struct sci_clk *clk = to_sci_clk(hw); |
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bool req_state, current_state; |
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int ret; |
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ret = clk->provider->ops->is_on(clk->provider->sci, clk->dev_id, |
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clk->clk_id, &req_state, |
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¤t_state); |
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if (ret) { |
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dev_err(clk->provider->dev, |
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"is_prepared failed for dev=%d, clk=%d, ret=%d\n", |
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clk->dev_id, clk->clk_id, ret); |
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return 0; |
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} |
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return req_state; |
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} |
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|
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/** |
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* sci_clk_recalc_rate - Get clock rate for a TI SCI clock |
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* @hw: clock to get rate for |
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* @parent_rate: parent rate provided by common clock framework, not used |
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* |
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* Gets the current clock rate of a TI SCI clock. Returns the current |
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* clock rate, or zero in failure. |
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*/ |
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static unsigned long sci_clk_recalc_rate(struct clk_hw *hw, |
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unsigned long parent_rate) |
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{ |
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struct sci_clk *clk = to_sci_clk(hw); |
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u64 freq; |
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int ret; |
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ret = clk->provider->ops->get_freq(clk->provider->sci, clk->dev_id, |
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clk->clk_id, &freq); |
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if (ret) { |
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dev_err(clk->provider->dev, |
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"recalc-rate failed for dev=%d, clk=%d, ret=%d\n", |
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clk->dev_id, clk->clk_id, ret); |
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return 0; |
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} |
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return freq; |
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} |
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|
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/** |
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* sci_clk_determine_rate - Determines a clock rate a clock can be set to |
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* @hw: clock to change rate for |
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* @req: requested rate configuration for the clock |
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* |
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* Determines a suitable clock rate and parent for a TI SCI clock. |
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* The parent handling is un-used, as generally the parent clock rates |
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* are not known by the kernel; instead these are internally handled |
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* by the firmware. Returns 0 on success, negative error value on failure. |
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*/ |
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static int sci_clk_determine_rate(struct clk_hw *hw, |
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struct clk_rate_request *req) |
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{ |
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struct sci_clk *clk = to_sci_clk(hw); |
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int ret; |
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u64 new_rate; |
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if (clk->cached_req && clk->cached_req == req->rate) { |
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req->rate = clk->cached_res; |
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return 0; |
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} |
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ret = clk->provider->ops->get_best_match_freq(clk->provider->sci, |
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clk->dev_id, |
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clk->clk_id, |
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req->min_rate, |
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req->rate, |
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req->max_rate, |
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&new_rate); |
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if (ret) { |
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dev_err(clk->provider->dev, |
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"determine-rate failed for dev=%d, clk=%d, ret=%d\n", |
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clk->dev_id, clk->clk_id, ret); |
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return ret; |
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} |
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clk->cached_req = req->rate; |
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clk->cached_res = new_rate; |
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req->rate = new_rate; |
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return 0; |
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} |
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/** |
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* sci_clk_set_rate - Set rate for a TI SCI clock |
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* @hw: clock to change rate for |
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* @rate: target rate for the clock |
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* @parent_rate: rate of the clock parent, not used for TI SCI clocks |
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* |
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* Sets a clock frequency for a TI SCI clock. Returns the TI SCI |
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* protocol status. |
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*/ |
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static int sci_clk_set_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long parent_rate) |
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{ |
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struct sci_clk *clk = to_sci_clk(hw); |
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return clk->provider->ops->set_freq(clk->provider->sci, clk->dev_id, |
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clk->clk_id, rate / 10 * 9, rate, |
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rate / 10 * 11); |
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} |
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/** |
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* sci_clk_get_parent - Get the current parent of a TI SCI clock |
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* @hw: clock to get parent for |
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* |
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* Returns the index of the currently selected parent for a TI SCI clock. |
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*/ |
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static u8 sci_clk_get_parent(struct clk_hw *hw) |
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{ |
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struct sci_clk *clk = to_sci_clk(hw); |
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u32 parent_id = 0; |
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int ret; |
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ret = clk->provider->ops->get_parent(clk->provider->sci, clk->dev_id, |
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clk->clk_id, (void *)&parent_id); |
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if (ret) { |
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dev_err(clk->provider->dev, |
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"get-parent failed for dev=%d, clk=%d, ret=%d\n", |
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clk->dev_id, clk->clk_id, ret); |
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return 0; |
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} |
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parent_id = parent_id - clk->clk_id - 1; |
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return (u8)parent_id; |
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} |
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/** |
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* sci_clk_set_parent - Set the parent of a TI SCI clock |
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* @hw: clock to set parent for |
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* @index: new parent index for the clock |
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* |
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* Sets the parent of a TI SCI clock. Return TI SCI protocol status. |
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*/ |
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static int sci_clk_set_parent(struct clk_hw *hw, u8 index) |
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{ |
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struct sci_clk *clk = to_sci_clk(hw); |
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clk->cached_req = 0; |
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return clk->provider->ops->set_parent(clk->provider->sci, clk->dev_id, |
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clk->clk_id, |
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index + 1 + clk->clk_id); |
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} |
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static const struct clk_ops sci_clk_ops = { |
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.prepare = sci_clk_prepare, |
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.unprepare = sci_clk_unprepare, |
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.is_prepared = sci_clk_is_prepared, |
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.recalc_rate = sci_clk_recalc_rate, |
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.determine_rate = sci_clk_determine_rate, |
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.set_rate = sci_clk_set_rate, |
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.get_parent = sci_clk_get_parent, |
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.set_parent = sci_clk_set_parent, |
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}; |
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/** |
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* _sci_clk_get - Gets a handle for an SCI clock |
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* @provider: Handle to SCI clock provider |
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* @sci_clk: Handle to the SCI clock to populate |
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* |
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* Gets a handle to an existing TI SCI hw clock, or builds a new clock |
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* entry and registers it with the common clock framework. Called from |
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* the common clock framework, when a corresponding of_clk_get call is |
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* executed, or recursively from itself when parsing parent clocks. |
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* Returns 0 on success, negative error code on failure. |
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*/ |
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static int _sci_clk_build(struct sci_clk_provider *provider, |
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struct sci_clk *sci_clk) |
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{ |
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struct clk_init_data init = { NULL }; |
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char *name = NULL; |
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char **parent_names = NULL; |
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int i; |
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int ret = 0; |
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name = kasprintf(GFP_KERNEL, "clk:%d:%d", sci_clk->dev_id, |
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sci_clk->clk_id); |
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init.name = name; |
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/* |
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* From kernel point of view, we only care about a clocks parents, |
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* if it has more than 1 possible parent. In this case, it is going |
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* to have mux functionality. Otherwise it is going to act as a root |
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* clock. |
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*/ |
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if (sci_clk->num_parents < 2) |
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sci_clk->num_parents = 0; |
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if (sci_clk->num_parents) { |
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parent_names = kcalloc(sci_clk->num_parents, sizeof(char *), |
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GFP_KERNEL); |
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if (!parent_names) { |
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ret = -ENOMEM; |
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goto err; |
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} |
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for (i = 0; i < sci_clk->num_parents; i++) { |
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char *parent_name; |
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parent_name = kasprintf(GFP_KERNEL, "clk:%d:%d", |
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sci_clk->dev_id, |
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sci_clk->clk_id + 1 + i); |
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if (!parent_name) { |
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ret = -ENOMEM; |
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goto err; |
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} |
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parent_names[i] = parent_name; |
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} |
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init.parent_names = (void *)parent_names; |
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} |
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init.ops = &sci_clk_ops; |
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init.num_parents = sci_clk->num_parents; |
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sci_clk->hw.init = &init; |
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ret = devm_clk_hw_register(provider->dev, &sci_clk->hw); |
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if (ret) |
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dev_err(provider->dev, "failed clk register with %d\n", ret); |
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err: |
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if (parent_names) { |
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for (i = 0; i < sci_clk->num_parents; i++) |
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kfree(parent_names[i]); |
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|
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kfree(parent_names); |
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} |
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kfree(name); |
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return ret; |
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} |
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static int _cmp_sci_clk(const void *a, const void *b) |
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{ |
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const struct sci_clk *ca = a; |
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const struct sci_clk *cb = *(struct sci_clk **)b; |
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if (ca->dev_id == cb->dev_id && ca->clk_id == cb->clk_id) |
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return 0; |
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if (ca->dev_id > cb->dev_id || |
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(ca->dev_id == cb->dev_id && ca->clk_id > cb->clk_id)) |
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return 1; |
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return -1; |
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} |
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|
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/** |
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* sci_clk_get - Xlate function for getting clock handles |
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* @clkspec: device tree clock specifier |
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* @data: pointer to the clock provider |
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* |
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* Xlate function for retrieving clock TI SCI hw clock handles based on |
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* device tree clock specifier. Called from the common clock framework, |
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* when a corresponding of_clk_get call is executed. Returns a pointer |
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* to the TI SCI hw clock struct, or ERR_PTR value in failure. |
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*/ |
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static struct clk_hw *sci_clk_get(struct of_phandle_args *clkspec, void *data) |
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{ |
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struct sci_clk_provider *provider = data; |
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struct sci_clk **clk; |
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struct sci_clk key; |
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if (clkspec->args_count != 2) |
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return ERR_PTR(-EINVAL); |
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key.dev_id = clkspec->args[0]; |
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key.clk_id = clkspec->args[1]; |
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clk = bsearch(&key, provider->clocks, provider->num_clocks, |
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sizeof(clk), _cmp_sci_clk); |
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|
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if (!clk) |
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return ERR_PTR(-ENODEV); |
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return &(*clk)->hw; |
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} |
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static int ti_sci_init_clocks(struct sci_clk_provider *p) |
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{ |
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int i; |
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int ret; |
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for (i = 0; i < p->num_clocks; i++) { |
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ret = _sci_clk_build(p, p->clocks[i]); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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static const struct of_device_id ti_sci_clk_of_match[] = { |
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{ .compatible = "ti,k2g-sci-clk" }, |
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{ /* Sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(of, ti_sci_clk_of_match); |
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|
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#ifdef CONFIG_TI_SCI_CLK_PROBE_FROM_FW |
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static int ti_sci_scan_clocks_from_fw(struct sci_clk_provider *provider) |
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{ |
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int ret; |
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int num_clks = 0; |
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struct sci_clk **clks = NULL; |
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struct sci_clk **tmp_clks; |
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struct sci_clk *sci_clk; |
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int max_clks = 0; |
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int clk_id = 0; |
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int dev_id = 0; |
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u32 num_parents = 0; |
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int gap_size = 0; |
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struct device *dev = provider->dev; |
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|
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while (1) { |
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ret = provider->ops->get_num_parents(provider->sci, dev_id, |
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clk_id, |
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(void *)&num_parents); |
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if (ret) { |
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gap_size++; |
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if (!clk_id) { |
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if (gap_size >= 5) |
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break; |
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dev_id++; |
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} else { |
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if (gap_size >= 2) { |
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dev_id++; |
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clk_id = 0; |
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gap_size = 0; |
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} else { |
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clk_id++; |
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} |
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} |
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continue; |
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} |
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gap_size = 0; |
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|
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if (num_clks == max_clks) { |
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tmp_clks = devm_kmalloc_array(dev, max_clks + 64, |
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sizeof(sci_clk), |
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GFP_KERNEL); |
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memcpy(tmp_clks, clks, max_clks * sizeof(sci_clk)); |
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if (max_clks) |
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devm_kfree(dev, clks); |
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max_clks += 64; |
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clks = tmp_clks; |
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} |
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sci_clk = devm_kzalloc(dev, sizeof(*sci_clk), GFP_KERNEL); |
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if (!sci_clk) |
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return -ENOMEM; |
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sci_clk->dev_id = dev_id; |
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sci_clk->clk_id = clk_id; |
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sci_clk->provider = provider; |
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sci_clk->num_parents = num_parents; |
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|
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clks[num_clks] = sci_clk; |
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|
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clk_id++; |
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num_clks++; |
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} |
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provider->clocks = devm_kmalloc_array(dev, num_clks, sizeof(sci_clk), |
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GFP_KERNEL); |
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if (!provider->clocks) |
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return -ENOMEM; |
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|
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memcpy(provider->clocks, clks, num_clks * sizeof(sci_clk)); |
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provider->num_clocks = num_clks; |
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|
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devm_kfree(dev, clks); |
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|
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return 0; |
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} |
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|
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#else |
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|
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static int _cmp_sci_clk_list(void *priv, struct list_head *a, |
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struct list_head *b) |
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{ |
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struct sci_clk *ca = container_of(a, struct sci_clk, node); |
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struct sci_clk *cb = container_of(b, struct sci_clk, node); |
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|
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return _cmp_sci_clk(ca, &cb); |
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} |
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|
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static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider) |
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{ |
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struct device *dev = provider->dev; |
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struct device_node *np = NULL; |
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int ret; |
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int index; |
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struct of_phandle_args args; |
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struct list_head clks; |
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struct sci_clk *sci_clk, *prev; |
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int num_clks = 0; |
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int num_parents; |
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int clk_id; |
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const char * const clk_names[] = { |
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"clocks", "assigned-clocks", "assigned-clock-parents", NULL |
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}; |
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const char * const *clk_name; |
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|
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INIT_LIST_HEAD(&clks); |
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|
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clk_name = clk_names; |
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|
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while (*clk_name) { |
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np = of_find_node_with_property(np, *clk_name); |
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if (!np) { |
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clk_name++; |
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continue; |
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} |
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|
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if (!of_device_is_available(np)) |
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continue; |
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|
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index = 0; |
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|
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do { |
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ret = of_parse_phandle_with_args(np, *clk_name, |
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"#clock-cells", index, |
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&args); |
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if (ret) |
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break; |
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|
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if (args.args_count == 2 && args.np == dev->of_node) { |
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sci_clk = devm_kzalloc(dev, sizeof(*sci_clk), |
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GFP_KERNEL); |
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if (!sci_clk) |
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return -ENOMEM; |
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|
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sci_clk->dev_id = args.args[0]; |
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sci_clk->clk_id = args.args[1]; |
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sci_clk->provider = provider; |
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provider->ops->get_num_parents(provider->sci, |
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sci_clk->dev_id, |
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sci_clk->clk_id, |
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(void *)&sci_clk->num_parents); |
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list_add_tail(&sci_clk->node, &clks); |
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|
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num_clks++; |
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|
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num_parents = sci_clk->num_parents; |
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if (num_parents == 1) |
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num_parents = 0; |
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|
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/* |
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* Linux kernel has inherent limitation |
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* of 255 clock parents at the moment. |
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* Right now, it is not expected that |
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* any mux clock from sci-clk driver |
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* would exceed that limit either, but |
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* the ABI basically provides that |
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* possibility. Print out a warning if |
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* this happens for any clock. |
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*/ |
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if (num_parents >= 255) { |
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dev_warn(dev, "too many parents for dev=%d, clk=%d (%d), cropping to 255.\n", |
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sci_clk->dev_id, |
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sci_clk->clk_id, num_parents); |
|
num_parents = 255; |
|
} |
|
|
|
clk_id = args.args[1] + 1; |
|
|
|
while (num_parents--) { |
|
sci_clk = devm_kzalloc(dev, |
|
sizeof(*sci_clk), |
|
GFP_KERNEL); |
|
if (!sci_clk) |
|
return -ENOMEM; |
|
sci_clk->dev_id = args.args[0]; |
|
sci_clk->clk_id = clk_id++; |
|
sci_clk->provider = provider; |
|
list_add_tail(&sci_clk->node, &clks); |
|
|
|
num_clks++; |
|
} |
|
} |
|
|
|
index++; |
|
} while (args.np); |
|
} |
|
|
|
list_sort(NULL, &clks, _cmp_sci_clk_list); |
|
|
|
provider->clocks = devm_kmalloc_array(dev, num_clks, sizeof(sci_clk), |
|
GFP_KERNEL); |
|
if (!provider->clocks) |
|
return -ENOMEM; |
|
|
|
num_clks = 0; |
|
prev = NULL; |
|
|
|
list_for_each_entry(sci_clk, &clks, node) { |
|
if (prev && prev->dev_id == sci_clk->dev_id && |
|
prev->clk_id == sci_clk->clk_id) |
|
continue; |
|
|
|
provider->clocks[num_clks++] = sci_clk; |
|
prev = sci_clk; |
|
} |
|
|
|
provider->num_clocks = num_clks; |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
/** |
|
* ti_sci_clk_probe - Probe function for the TI SCI clock driver |
|
* @pdev: platform device pointer to be probed |
|
* |
|
* Probes the TI SCI clock device. Allocates a new clock provider |
|
* and registers this to the common clock framework. Also applies |
|
* any required flags to the identified clocks via clock lists |
|
* supplied from DT. Returns 0 for success, negative error value |
|
* for failure. |
|
*/ |
|
static int ti_sci_clk_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct device_node *np = dev->of_node; |
|
struct sci_clk_provider *provider; |
|
const struct ti_sci_handle *handle; |
|
int ret; |
|
|
|
handle = devm_ti_sci_get_handle(dev); |
|
if (IS_ERR(handle)) |
|
return PTR_ERR(handle); |
|
|
|
provider = devm_kzalloc(dev, sizeof(*provider), GFP_KERNEL); |
|
if (!provider) |
|
return -ENOMEM; |
|
|
|
provider->sci = handle; |
|
provider->ops = &handle->ops.clk_ops; |
|
provider->dev = dev; |
|
|
|
#ifdef CONFIG_TI_SCI_CLK_PROBE_FROM_FW |
|
ret = ti_sci_scan_clocks_from_fw(provider); |
|
if (ret) { |
|
dev_err(dev, "scan clocks from FW failed: %d\n", ret); |
|
return ret; |
|
} |
|
#else |
|
ret = ti_sci_scan_clocks_from_dt(provider); |
|
if (ret) { |
|
dev_err(dev, "scan clocks from DT failed: %d\n", ret); |
|
return ret; |
|
} |
|
#endif |
|
|
|
ret = ti_sci_init_clocks(provider); |
|
if (ret) { |
|
pr_err("ti-sci-init-clocks failed.\n"); |
|
return ret; |
|
} |
|
|
|
return of_clk_add_hw_provider(np, sci_clk_get, provider); |
|
} |
|
|
|
/** |
|
* ti_sci_clk_remove - Remove TI SCI clock device |
|
* @pdev: platform device pointer for the device to be removed |
|
* |
|
* Removes the TI SCI device. Unregisters the clock provider registered |
|
* via common clock framework. Any memory allocated for the device will |
|
* be free'd silently via the devm framework. Returns 0 always. |
|
*/ |
|
static int ti_sci_clk_remove(struct platform_device *pdev) |
|
{ |
|
of_clk_del_provider(pdev->dev.of_node); |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver ti_sci_clk_driver = { |
|
.probe = ti_sci_clk_probe, |
|
.remove = ti_sci_clk_remove, |
|
.driver = { |
|
.name = "ti-sci-clk", |
|
.of_match_table = of_match_ptr(ti_sci_clk_of_match), |
|
}, |
|
}; |
|
module_platform_driver(ti_sci_clk_driver); |
|
|
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_DESCRIPTION("TI System Control Interface(SCI) Clock driver"); |
|
MODULE_AUTHOR("Tero Kristo"); |
|
MODULE_ALIAS("platform:ti-sci-clk");
|
|
|