1 files changed, 429 insertions, 0 deletions
diff --git a/sound/soc/intel/skylake/skl-ssp-clk.c b/sound/soc/intel/skylake/skl-ssp-clk.c
new file mode 100644
index 000000000..cda1b5fa7
--- /dev/null
+++ b/sound/soc/intel/skylake/skl-ssp-clk.c
@@ -0,0 +1,429 @@
+// 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 */
+static 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");