diff options
Diffstat (limited to 'drivers/clk/samsung/clk-acpm.c')
| -rw-r--r-- | drivers/clk/samsung/clk-acpm.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/clk/samsung/clk-acpm.c b/drivers/clk/samsung/clk-acpm.c new file mode 100644 index 000000000000..b90809ce3f88 --- /dev/null +++ b/drivers/clk/samsung/clk-acpm.c @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Samsung Exynos ACPM protocol based clock driver. + * + * Copyright 2025 Linaro Ltd. + */ + +#include <linux/array_size.h> +#include <linux/clk-provider.h> +#include <linux/container_of.h> +#include <linux/device/devres.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/firmware/samsung/exynos-acpm-protocol.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/types.h> + +struct acpm_clk { + u32 id; + struct clk_hw hw; + unsigned int mbox_chan_id; + const struct acpm_handle *handle; +}; + +struct acpm_clk_variant { + const char *name; +}; + +struct acpm_clk_driver_data { + const struct acpm_clk_variant *clks; + unsigned int nr_clks; + unsigned int mbox_chan_id; +}; + +#define to_acpm_clk(clk) container_of(clk, struct acpm_clk, hw) + +#define ACPM_CLK(cname) \ + { \ + .name = cname, \ + } + +static const struct acpm_clk_variant gs101_acpm_clks[] = { + ACPM_CLK("mif"), + ACPM_CLK("int"), + ACPM_CLK("cpucl0"), + ACPM_CLK("cpucl1"), + ACPM_CLK("cpucl2"), + ACPM_CLK("g3d"), + ACPM_CLK("g3dl2"), + ACPM_CLK("tpu"), + ACPM_CLK("intcam"), + ACPM_CLK("tnr"), + ACPM_CLK("cam"), + ACPM_CLK("mfc"), + ACPM_CLK("disp"), + ACPM_CLK("bo"), +}; + +static const struct acpm_clk_driver_data acpm_clk_gs101 = { + .clks = gs101_acpm_clks, + .nr_clks = ARRAY_SIZE(gs101_acpm_clks), + .mbox_chan_id = 0, +}; + +static unsigned long acpm_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct acpm_clk *clk = to_acpm_clk(hw); + + return clk->handle->ops.dvfs_ops.get_rate(clk->handle, + clk->mbox_chan_id, clk->id); +} + +static int acpm_clk_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + /* + * We can't figure out what rate it will be, so just return the + * rate back to the caller. acpm_clk_recalc_rate() will be called + * after the rate is set and we'll know what rate the clock is + * running at then. + */ + return 0; +} + +static int acpm_clk_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct acpm_clk *clk = to_acpm_clk(hw); + + return clk->handle->ops.dvfs_ops.set_rate(clk->handle, + clk->mbox_chan_id, clk->id, rate); +} + +static const struct clk_ops acpm_clk_ops = { + .recalc_rate = acpm_clk_recalc_rate, + .determine_rate = acpm_clk_determine_rate, + .set_rate = acpm_clk_set_rate, +}; + +static int acpm_clk_register(struct device *dev, struct acpm_clk *aclk, + const char *name) +{ + struct clk_init_data init = {}; + + init.name = name; + init.ops = &acpm_clk_ops; + aclk->hw.init = &init; + + return devm_clk_hw_register(dev, &aclk->hw); +} + +static int acpm_clk_probe(struct platform_device *pdev) +{ + const struct acpm_handle *acpm_handle; + struct clk_hw_onecell_data *clk_data; + struct clk_hw **hws; + struct device *dev = &pdev->dev; + struct acpm_clk *aclks; + unsigned int mbox_chan_id; + int i, err, count; + + acpm_handle = devm_acpm_get_by_node(dev, dev->parent->of_node); + if (IS_ERR(acpm_handle)) + return dev_err_probe(dev, PTR_ERR(acpm_handle), + "Failed to get acpm handle\n"); + + count = acpm_clk_gs101.nr_clks; + mbox_chan_id = acpm_clk_gs101.mbox_chan_id; + + clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, count), + GFP_KERNEL); + if (!clk_data) + return -ENOMEM; + + clk_data->num = count; + hws = clk_data->hws; + + aclks = devm_kcalloc(dev, count, sizeof(*aclks), GFP_KERNEL); + if (!aclks) + return -ENOMEM; + + for (i = 0; i < count; i++) { + struct acpm_clk *aclk = &aclks[i]; + + /* + * The code assumes the clock IDs start from zero, + * are sequential and do not have gaps. + */ + aclk->id = i; + aclk->handle = acpm_handle; + aclk->mbox_chan_id = mbox_chan_id; + + hws[i] = &aclk->hw; + + err = acpm_clk_register(dev, aclk, + acpm_clk_gs101.clks[i].name); + if (err) + return dev_err_probe(dev, err, + "Failed to register clock\n"); + } + + return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, + clk_data); +} + +static const struct platform_device_id acpm_clk_id[] = { + { "gs101-acpm-clk" }, + {} +}; +MODULE_DEVICE_TABLE(platform, acpm_clk_id); + +static struct platform_driver acpm_clk_driver = { + .driver = { + .name = "acpm-clocks", + }, + .probe = acpm_clk_probe, + .id_table = acpm_clk_id, +}; +module_platform_driver(acpm_clk_driver); + +MODULE_AUTHOR("Tudor Ambarus <tudor.ambarus@linaro.org>"); +MODULE_DESCRIPTION("Samsung Exynos ACPM clock driver"); +MODULE_LICENSE("GPL"); |