--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright(c) 2015-17 Intel Corporation
+
+/*
+ * skl-ssp-clk.c - ASoC skylake ssp clock driver
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include "skl.h"
+#include "skl-ssp-clk.h"
+#include "skl-topology.h"
+
+#define to_skl_clk(_hw) container_of(_hw, struct skl_clk, hw)
+
+struct skl_clk_parent {
+ struct clk_hw *hw;
+ struct clk_lookup *lookup;
+};
+
+struct skl_clk {
+ struct clk_hw hw;
+ struct clk_lookup *lookup;
+ unsigned long rate;
+ struct skl_clk_pdata *pdata;
+ u32 id;
+};
+
+struct skl_clk_data {
+ struct skl_clk_parent parent[SKL_MAX_CLK_SRC];
+ struct skl_clk *clk[SKL_MAX_CLK_CNT];
+ u8 avail_clk_cnt;
+};
+
+static int skl_get_clk_type(u32 index)
+{
+ switch (index) {
+ case 0 ... (SKL_SCLK_OFS - 1):
+ return SKL_MCLK;
+
+ case SKL_SCLK_OFS ... (SKL_SCLKFS_OFS - 1):
+ return SKL_SCLK;
+
+ case SKL_SCLKFS_OFS ... (SKL_MAX_CLK_CNT - 1):
+ return SKL_SCLK_FS;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int skl_get_vbus_id(u32 index, u8 clk_type)
+{
+ switch (clk_type) {
+ case SKL_MCLK:
+ return index;
+
+ case SKL_SCLK:
+ return index - SKL_SCLK_OFS;
+
+ case SKL_SCLK_FS:
+ return index - SKL_SCLKFS_OFS;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static void skl_fill_clk_ipc(struct skl_clk_rate_cfg_table *rcfg, u8 clk_type)
+{
+ struct nhlt_fmt_cfg *fmt_cfg;
+ union skl_clk_ctrl_ipc *ipc;
+ struct wav_fmt *wfmt;
+
+ if (!rcfg)
+ return;
+
+ ipc = &rcfg->dma_ctl_ipc;
+ if (clk_type == SKL_SCLK_FS) {
+ fmt_cfg = (struct nhlt_fmt_cfg *)rcfg->config;
+ wfmt = &fmt_cfg->fmt_ext.fmt;
+
+ /* Remove TLV Header size */
+ ipc->sclk_fs.hdr.size = sizeof(struct skl_dmactrl_sclkfs_cfg) -
+ sizeof(struct skl_tlv_hdr);
+ ipc->sclk_fs.sampling_frequency = wfmt->samples_per_sec;
+ ipc->sclk_fs.bit_depth = wfmt->bits_per_sample;
+ ipc->sclk_fs.valid_bit_depth =
+ fmt_cfg->fmt_ext.sample.valid_bits_per_sample;
+ ipc->sclk_fs.number_of_channels = wfmt->channels;
+ } else {
+ ipc->mclk.hdr.type = DMA_CLK_CONTROLS;
+ /* Remove TLV Header size */
+ ipc->mclk.hdr.size = sizeof(struct skl_dmactrl_mclk_cfg) -
+ sizeof(struct skl_tlv_hdr);
+ }
+}
+
+/* Sends dma control IPC to turn the clock ON/OFF */
+static int skl_send_clk_dma_control(struct skl *skl,
+ struct skl_clk_rate_cfg_table *rcfg,
+ u32 vbus_id, u8 clk_type,
+ bool enable)
+{
+ struct nhlt_specific_cfg *sp_cfg;
+ u32 i2s_config_size, node_id = 0;
+ struct nhlt_fmt_cfg *fmt_cfg;
+ union skl_clk_ctrl_ipc *ipc;
+ void *i2s_config = NULL;
+ u8 *data, size;
+ int ret;
+
+ if (!rcfg)
+ return -EIO;
+
+ ipc = &rcfg->dma_ctl_ipc;
+ fmt_cfg = (struct nhlt_fmt_cfg *)rcfg->config;
+ sp_cfg = &fmt_cfg->config;
+
+ if (clk_type == SKL_SCLK_FS) {
+ ipc->sclk_fs.hdr.type =
+ enable ? DMA_TRANSMITION_START : DMA_TRANSMITION_STOP;
+ data = (u8 *)&ipc->sclk_fs;
+ size = sizeof(struct skl_dmactrl_sclkfs_cfg);
+ } else {
+ /* 1 to enable mclk, 0 to enable sclk */
+ if (clk_type == SKL_SCLK)
+ ipc->mclk.mclk = 0;
+ else
+ ipc->mclk.mclk = 1;
+
+ ipc->mclk.keep_running = enable;
+ ipc->mclk.warm_up_over = enable;
+ ipc->mclk.clk_stop_over = !enable;
+ data = (u8 *)&ipc->mclk;
+ size = sizeof(struct skl_dmactrl_mclk_cfg);
+ }
+
+ i2s_config_size = sp_cfg->size + size;
+ i2s_config = kzalloc(i2s_config_size, GFP_KERNEL);
+ if (!i2s_config)
+ return -ENOMEM;
+
+ /* copy blob */
+ memcpy(i2s_config, sp_cfg->caps, sp_cfg->size);
+
+ /* copy additional dma controls information */
+ memcpy(i2s_config + sp_cfg->size, data, size);
+
+ node_id = ((SKL_DMA_I2S_LINK_INPUT_CLASS << 8) | (vbus_id << 4));
+ ret = skl_dsp_set_dma_control(skl->skl_sst, (u32 *)i2s_config,
+ i2s_config_size, node_id);
+ kfree(i2s_config);
+
+ return ret;
+}
+
+static struct skl_clk_rate_cfg_table *skl_get_rate_cfg(
+ struct skl_clk_rate_cfg_table *rcfg,
+ unsigned long rate)
+{
+ int i;
+
+ for (i = 0; (i < SKL_MAX_CLK_RATES) && rcfg[i].rate; i++) {
+ if (rcfg[i].rate == rate)
+ return &rcfg[i];
+ }
+
+ return NULL;
+}
+
+static int skl_clk_change_status(struct skl_clk *clkdev,
+ bool enable)
+{
+ struct skl_clk_rate_cfg_table *rcfg;
+ int vbus_id, clk_type;
+
+ clk_type = skl_get_clk_type(clkdev->id);
+ if (clk_type < 0)
+ return clk_type;
+
+ vbus_id = skl_get_vbus_id(clkdev->id, clk_type);
+ if (vbus_id < 0)
+ return vbus_id;
+
+ rcfg = skl_get_rate_cfg(clkdev->pdata->ssp_clks[clkdev->id].rate_cfg,
+ clkdev->rate);
+ if (!rcfg)
+ return -EINVAL;
+
+ return skl_send_clk_dma_control(clkdev->pdata->pvt_data, rcfg,
+ vbus_id, clk_type, enable);
+}
+
+static int skl_clk_prepare(struct clk_hw *hw)
+{
+ struct skl_clk *clkdev = to_skl_clk(hw);
+
+ return skl_clk_change_status(clkdev, true);
+}
+
+static void skl_clk_unprepare(struct clk_hw *hw)
+{
+ struct skl_clk *clkdev = to_skl_clk(hw);
+
+ skl_clk_change_status(clkdev, false);
+}
+
+static int skl_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct skl_clk *clkdev = to_skl_clk(hw);
+ struct skl_clk_rate_cfg_table *rcfg;
+ int clk_type;
+
+ if (!rate)
+ return -EINVAL;
+
+ rcfg = skl_get_rate_cfg(clkdev->pdata->ssp_clks[clkdev->id].rate_cfg,
+ rate);
+ if (!rcfg)
+ return -EINVAL;
+
+ clk_type = skl_get_clk_type(clkdev->id);
+ if (clk_type < 0)
+ return clk_type;
+
+ skl_fill_clk_ipc(rcfg, clk_type);
+ clkdev->rate = rate;
+
+ return 0;
+}
+
+static unsigned long skl_clk_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct skl_clk *clkdev = to_skl_clk(hw);
+
+ if (clkdev->rate)
+ return clkdev->rate;
+
+ return 0;
+}
+
+/* Not supported by clk driver. Implemented to satisfy clk fw */
+long skl_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ return rate;
+}
+
+/*
+ * prepare/unprepare are used instead of enable/disable as IPC will be sent
+ * in non-atomic context.
+ */
+static const struct clk_ops skl_clk_ops = {
+ .prepare = skl_clk_prepare,
+ .unprepare = skl_clk_unprepare,
+ .set_rate = skl_clk_set_rate,
+ .round_rate = skl_clk_round_rate,
+ .recalc_rate = skl_clk_recalc_rate,
+};
+
+static void unregister_parent_src_clk(struct skl_clk_parent *pclk,
+ unsigned int id)
+{
+ while (id--) {
+ clkdev_drop(pclk[id].lookup);
+ clk_hw_unregister_fixed_rate(pclk[id].hw);
+ }
+}
+
+static void unregister_src_clk(struct skl_clk_data *dclk)
+{
+ u8 cnt = dclk->avail_clk_cnt;
+
+ while (cnt--)
+ clkdev_drop(dclk->clk[cnt]->lookup);
+}
+
+static int skl_register_parent_clks(struct device *dev,
+ struct skl_clk_parent *parent,
+ struct skl_clk_parent_src *pclk)
+{
+ int i, ret;
+
+ for (i = 0; i < SKL_MAX_CLK_SRC; i++) {
+
+ /* Register Parent clock */
+ parent[i].hw = clk_hw_register_fixed_rate(dev, pclk[i].name,
+ pclk[i].parent_name, 0, pclk[i].rate);
+ if (IS_ERR(parent[i].hw)) {
+ ret = PTR_ERR(parent[i].hw);
+ goto err;
+ }
+
+ parent[i].lookup = clkdev_hw_create(parent[i].hw, pclk[i].name,
+ NULL);
+ if (!parent[i].lookup) {
+ clk_hw_unregister_fixed_rate(parent[i].hw);
+ ret = -ENOMEM;
+ goto err;
+ }
+ }
+
+ return 0;
+err:
+ unregister_parent_src_clk(parent, i);
+ return ret;
+}
+
+/* Assign fmt_config to clk_data */
+static struct skl_clk *register_skl_clk(struct device *dev,
+ struct skl_ssp_clk *clk,
+ struct skl_clk_pdata *clk_pdata, int id)
+{
+ struct clk_init_data init;
+ struct skl_clk *clkdev;
+ int ret;
+
+ clkdev = devm_kzalloc(dev, sizeof(*clkdev), GFP_KERNEL);
+ if (!clkdev)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = clk->name;
+ init.ops = &skl_clk_ops;
+ init.flags = CLK_SET_RATE_GATE;
+ init.parent_names = &clk->parent_name;
+ init.num_parents = 1;
+ clkdev->hw.init = &init;
+ clkdev->pdata = clk_pdata;
+
+ clkdev->id = id;
+ ret = devm_clk_hw_register(dev, &clkdev->hw);
+ if (ret) {
+ clkdev = ERR_PTR(ret);
+ return clkdev;
+ }
+
+ clkdev->lookup = clkdev_hw_create(&clkdev->hw, init.name, NULL);
+ if (!clkdev->lookup)
+ clkdev = ERR_PTR(-ENOMEM);
+
+ return clkdev;
+}
+
+static int skl_clk_dev_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device *parent_dev = dev->parent;
+ struct skl_clk_parent_src *parent_clks;
+ struct skl_clk_pdata *clk_pdata;
+ struct skl_clk_data *data;
+ struct skl_ssp_clk *clks;
+ int ret, i;
+
+ clk_pdata = dev_get_platdata(&pdev->dev);
+ parent_clks = clk_pdata->parent_clks;
+ clks = clk_pdata->ssp_clks;
+ if (!parent_clks || !clks)
+ return -EIO;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* Register Parent clock */
+ ret = skl_register_parent_clks(parent_dev, data->parent, parent_clks);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < clk_pdata->num_clks; i++) {
+ /*
+ * Only register valid clocks
+ * i.e. for which nhlt entry is present.
+ */
+ if (clks[i].rate_cfg[0].rate == 0)
+ continue;
+
+ data->clk[i] = register_skl_clk(dev, &clks[i], clk_pdata, i);
+ if (IS_ERR(data->clk[i])) {
+ ret = PTR_ERR(data->clk[i]);
+ goto err_unreg_skl_clk;
+ }
+
+ data->avail_clk_cnt++;
+ }
+
+ platform_set_drvdata(pdev, data);
+
+ return 0;
+
+err_unreg_skl_clk:
+ unregister_src_clk(data);
+ unregister_parent_src_clk(data->parent, SKL_MAX_CLK_SRC);
+
+ return ret;
+}
+
+static int skl_clk_dev_remove(struct platform_device *pdev)
+{
+ struct skl_clk_data *data;
+
+ data = platform_get_drvdata(pdev);
+ unregister_src_clk(data);
+ unregister_parent_src_clk(data->parent, SKL_MAX_CLK_SRC);
+
+ return 0;
+}
+
+static struct platform_driver skl_clk_driver = {
+ .driver = {
+ .name = "skl-ssp-clk",
+ },
+ .probe = skl_clk_dev_probe,
+ .remove = skl_clk_dev_remove,
+};
+
+module_platform_driver(skl_clk_driver);
+
+MODULE_DESCRIPTION("Skylake clock driver");
+MODULE_AUTHOR("Jaikrishna Nemallapudi <jaikrishnax.nemallapudi@intel.com>");
+MODULE_AUTHOR("Subhransu S. Prusty <subhransu.s.prusty@intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:skl-ssp-clk");
projects / platform / kernel / linux-rpi.git / commitdiff