2017-06-13 16:19:36 +00:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Power Interface (SCMI) Protocol based clock driver
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*
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* Copyright (C) 2018 ARM Ltd.
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*/
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#include <linux/clk-provider.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/scmi_protocol.h>
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#include <asm/div64.h>
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struct scmi_clk {
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u32 id;
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struct clk_hw hw;
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const struct scmi_clock_info *info;
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const struct scmi_handle *handle;
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};
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#define to_scmi_clk(clk) container_of(clk, struct scmi_clk, hw)
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static unsigned long scmi_clk_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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int ret;
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u64 rate;
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struct scmi_clk *clk = to_scmi_clk(hw);
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ret = clk->handle->clk_ops->rate_get(clk->handle, clk->id, &rate);
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if (ret)
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return 0;
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return rate;
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}
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static long scmi_clk_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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u64 fmin, fmax, ftmp;
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struct scmi_clk *clk = to_scmi_clk(hw);
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/*
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* We can't figure out what rate it will be, so just return the
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* rate back to the caller. scmi_clk_recalc_rate() will be called
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* after the rate is set and we'll know what rate the clock is
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* running at then.
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*/
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if (clk->info->rate_discrete)
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return rate;
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fmin = clk->info->range.min_rate;
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fmax = clk->info->range.max_rate;
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if (rate <= fmin)
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return fmin;
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else if (rate >= fmax)
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return fmax;
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ftmp = rate - fmin;
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ftmp += clk->info->range.step_size - 1; /* to round up */
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2018-07-31 05:55:55 +00:00
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do_div(ftmp, clk->info->range.step_size);
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2017-06-13 16:19:36 +00:00
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2018-07-31 05:55:55 +00:00
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return ftmp * clk->info->range.step_size + fmin;
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2017-06-13 16:19:36 +00:00
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}
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static int scmi_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 scmi_clk *clk = to_scmi_clk(hw);
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return clk->handle->clk_ops->rate_set(clk->handle, clk->id, 0, rate);
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}
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static int scmi_clk_enable(struct clk_hw *hw)
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{
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struct scmi_clk *clk = to_scmi_clk(hw);
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return clk->handle->clk_ops->enable(clk->handle, clk->id);
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}
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static void scmi_clk_disable(struct clk_hw *hw)
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{
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struct scmi_clk *clk = to_scmi_clk(hw);
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clk->handle->clk_ops->disable(clk->handle, clk->id);
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}
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static const struct clk_ops scmi_clk_ops = {
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.recalc_rate = scmi_clk_recalc_rate,
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.round_rate = scmi_clk_round_rate,
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.set_rate = scmi_clk_set_rate,
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/*
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* We can't provide enable/disable callback as we can't perform the same
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* in atomic context. Since the clock framework provides standard API
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* clk_prepare_enable that helps cases using clk_enable in non-atomic
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* context, it should be fine providing prepare/unprepare.
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*/
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.prepare = scmi_clk_enable,
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.unprepare = scmi_clk_disable,
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};
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static int scmi_clk_ops_init(struct device *dev, struct scmi_clk *sclk)
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{
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int ret;
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struct clk_init_data init = {
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.flags = CLK_GET_RATE_NOCACHE,
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.num_parents = 0,
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.ops = &scmi_clk_ops,
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.name = sclk->info->name,
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};
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sclk->hw.init = &init;
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ret = devm_clk_hw_register(dev, &sclk->hw);
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if (!ret)
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clk_hw_set_rate_range(&sclk->hw, sclk->info->range.min_rate,
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sclk->info->range.max_rate);
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return ret;
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}
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static int scmi_clocks_probe(struct scmi_device *sdev)
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{
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int idx, count, err;
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struct clk_hw **hws;
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struct clk_hw_onecell_data *clk_data;
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struct device *dev = &sdev->dev;
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struct device_node *np = dev->of_node;
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const struct scmi_handle *handle = sdev->handle;
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if (!handle || !handle->clk_ops)
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return -ENODEV;
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count = handle->clk_ops->count_get(handle);
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if (count < 0) {
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2018-08-28 15:44:29 +00:00
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dev_err(dev, "%pOFn: invalid clock output count\n", np);
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2017-06-13 16:19:36 +00:00
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return -EINVAL;
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}
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treewide: Use struct_size() for devm_kmalloc() and friends
Replaces open-coded struct size calculations with struct_size() for
devm_*, f2fs_*, and sock_* allocations. Automatically generated (and
manually adjusted) from the following Coccinelle script:
// Direct reference to struct field.
@@
identifier alloc =~ "devm_kmalloc|devm_kzalloc|sock_kmalloc|f2fs_kmalloc|f2fs_kzalloc";
expression HANDLE;
expression GFP;
identifier VAR, ELEMENT;
expression COUNT;
@@
- alloc(HANDLE, sizeof(*VAR) + COUNT * sizeof(*VAR->ELEMENT), GFP)
+ alloc(HANDLE, struct_size(VAR, ELEMENT, COUNT), GFP)
// mr = kzalloc(sizeof(*mr) + m * sizeof(mr->map[0]), GFP_KERNEL);
@@
identifier alloc =~ "devm_kmalloc|devm_kzalloc|sock_kmalloc|f2fs_kmalloc|f2fs_kzalloc";
expression HANDLE;
expression GFP;
identifier VAR, ELEMENT;
expression COUNT;
@@
- alloc(HANDLE, sizeof(*VAR) + COUNT * sizeof(VAR->ELEMENT[0]), GFP)
+ alloc(HANDLE, struct_size(VAR, ELEMENT, COUNT), GFP)
// Same pattern, but can't trivially locate the trailing element name,
// or variable name.
@@
identifier alloc =~ "devm_kmalloc|devm_kzalloc|sock_kmalloc|f2fs_kmalloc|f2fs_kzalloc";
expression HANDLE;
expression GFP;
expression SOMETHING, COUNT, ELEMENT;
@@
- alloc(HANDLE, sizeof(SOMETHING) + COUNT * sizeof(ELEMENT), GFP)
+ alloc(HANDLE, CHECKME_struct_size(&SOMETHING, ELEMENT, COUNT), GFP)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-05-08 23:08:53 +00:00
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clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, count),
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GFP_KERNEL);
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2017-06-13 16:19:36 +00:00
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if (!clk_data)
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return -ENOMEM;
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clk_data->num = count;
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hws = clk_data->hws;
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for (idx = 0; idx < count; idx++) {
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struct scmi_clk *sclk;
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sclk = devm_kzalloc(dev, sizeof(*sclk), GFP_KERNEL);
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if (!sclk)
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return -ENOMEM;
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sclk->info = handle->clk_ops->info_get(handle, idx);
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if (!sclk->info) {
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dev_dbg(dev, "invalid clock info for idx %d\n", idx);
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continue;
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}
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sclk->id = idx;
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sclk->handle = handle;
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err = scmi_clk_ops_init(dev, sclk);
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if (err) {
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dev_err(dev, "failed to register clock %d\n", idx);
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devm_kfree(dev, sclk);
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hws[idx] = NULL;
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} else {
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dev_dbg(dev, "Registered clock:%s\n", sclk->info->name);
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hws[idx] = &sclk->hw;
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}
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}
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2018-03-20 11:22:48 +00:00
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return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
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clk_data);
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2017-06-13 16:19:36 +00:00
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}
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static const struct scmi_device_id scmi_id_table[] = {
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{ SCMI_PROTOCOL_CLOCK },
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{ },
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};
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MODULE_DEVICE_TABLE(scmi, scmi_id_table);
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static struct scmi_driver scmi_clocks_driver = {
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.name = "scmi-clocks",
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.probe = scmi_clocks_probe,
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.id_table = scmi_id_table,
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};
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module_scmi_driver(scmi_clocks_driver);
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MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
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MODULE_DESCRIPTION("ARM SCMI clock driver");
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MODULE_LICENSE("GPL v2");
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