1 files changed, 401 insertions, 0 deletions

diff --git a/drivers/soundwire/mipi_disco.c b/drivers/soundwire/mipi_disco.c
new file mode 100644
index 000000000..fdeba0c3b
--- /dev/null
+++ b/drivers/soundwire/mipi_disco.c
@@ -0,0 +1,401 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+// Copyright(c) 2015-17 Intel Corporation.
+
+/*
+ * MIPI Discovery And Configuration (DisCo) Specification for SoundWire
+ * specifies properties to be implemented for SoundWire Masters and Slaves.
+ * The DisCo spec doesn't mandate these properties. However, SDW bus cannot
+ * work without knowing these values.
+ *
+ * The helper functions read the Master and Slave properties. Implementers
+ * of Master or Slave drivers can use any of the below three mechanisms:
+ *    a) Use these APIs here as .read_prop() callback for Master and Slave
+ *    b) Implement own methods and set those as .read_prop(), but invoke
+ *    APIs in this file for generic read and override the values with
+ *    platform specific data
+ *    c) Implement ones own methods which do not use anything provided
+ *    here
+ */
+
+#include <linux/device.h>
+#include <linux/property.h>
+#include <linux/mod_devicetable.h>
+#include <linux/soundwire/sdw.h>
+#include "bus.h"
+
+/**
+ * sdw_master_read_prop() - Read Master properties
+ * @bus: SDW bus instance
+ */
+int sdw_master_read_prop(struct sdw_bus *bus)
+{
+	struct sdw_master_prop *prop = &bus->prop;
+	struct fwnode_handle *link;
+	char name[32];
+	int nval, i;
+
+	device_property_read_u32(bus->dev,
+			"mipi-sdw-sw-interface-revision", &prop->revision);
+
+	/* Find master handle */
+	snprintf(name, sizeof(name),
+			"mipi-sdw-master-%d-subproperties", bus->link_id);
+
+	link = device_get_named_child_node(bus->dev, name);
+	if (!link) {
+		dev_err(bus->dev, "Master node %s not found\n", name);
+		return -EIO;
+	}
+
+	if (fwnode_property_read_bool(link,
+			"mipi-sdw-clock-stop-mode0-supported") == true)
+		prop->clk_stop_mode = SDW_CLK_STOP_MODE0;
+
+	if (fwnode_property_read_bool(link,
+			"mipi-sdw-clock-stop-mode1-supported") == true)
+		prop->clk_stop_mode |= SDW_CLK_STOP_MODE1;
+
+	fwnode_property_read_u32(link,
+			"mipi-sdw-max-clock-frequency", &prop->max_freq);
+
+	nval = fwnode_property_read_u32_array(link,
+			"mipi-sdw-clock-frequencies-supported", NULL, 0);
+	if (nval > 0) {
+
+		prop->num_freq = nval;
+		prop->freq = devm_kcalloc(bus->dev, prop->num_freq,
+				sizeof(*prop->freq), GFP_KERNEL);
+		if (!prop->freq)
+			return -ENOMEM;
+
+		fwnode_property_read_u32_array(link,
+				"mipi-sdw-clock-frequencies-supported",
+				prop->freq, prop->num_freq);
+	}
+
+	/*
+	 * Check the frequencies supported. If FW doesn't provide max
+	 * freq, then populate here by checking values.
+	 */
+	if (!prop->max_freq && prop->freq) {
+		prop->max_freq = prop->freq[0];
+		for (i = 1; i < prop->num_freq; i++) {
+			if (prop->freq[i] > prop->max_freq)
+				prop->max_freq = prop->freq[i];
+		}
+	}
+
+	nval = fwnode_property_read_u32_array(link,
+			"mipi-sdw-supported-clock-gears", NULL, 0);
+	if (nval > 0) {
+
+		prop->num_clk_gears = nval;
+		prop->clk_gears = devm_kcalloc(bus->dev, prop->num_clk_gears,
+				sizeof(*prop->clk_gears), GFP_KERNEL);
+		if (!prop->clk_gears)
+			return -ENOMEM;
+
+		fwnode_property_read_u32_array(link,
+				"mipi-sdw-supported-clock-gears",
+				prop->clk_gears, prop->num_clk_gears);
+	}
+
+	fwnode_property_read_u32(link, "mipi-sdw-default-frame-rate",
+			&prop->default_frame_rate);
+
+	fwnode_property_read_u32(link, "mipi-sdw-default-frame-row-size",
+			&prop->default_row);
+
+	fwnode_property_read_u32(link, "mipi-sdw-default-frame-col-size",
+			&prop->default_col);
+
+	prop->dynamic_frame =  fwnode_property_read_bool(link,
+			"mipi-sdw-dynamic-frame-shape");
+
+	fwnode_property_read_u32(link, "mipi-sdw-command-error-threshold",
+			&prop->err_threshold);
+
+	return 0;
+}
+EXPORT_SYMBOL(sdw_master_read_prop);
+
+static int sdw_slave_read_dp0(struct sdw_slave *slave,
+		struct fwnode_handle *port, struct sdw_dp0_prop *dp0)
+{
+	int nval;
+
+	fwnode_property_read_u32(port, "mipi-sdw-port-max-wordlength",
+			&dp0->max_word);
+
+	fwnode_property_read_u32(port, "mipi-sdw-port-min-wordlength",
+			&dp0->min_word);
+
+	nval = fwnode_property_read_u32_array(port,
+			"mipi-sdw-port-wordlength-configs", NULL, 0);
+	if (nval > 0) {
+
+		dp0->num_words = nval;
+		dp0->words = devm_kcalloc(&slave->dev,
+				dp0->num_words, sizeof(*dp0->words),
+				GFP_KERNEL);
+		if (!dp0->words)
+			return -ENOMEM;
+
+		fwnode_property_read_u32_array(port,
+				"mipi-sdw-port-wordlength-configs",
+				dp0->words, dp0->num_words);
+	}
+
+	dp0->flow_controlled = fwnode_property_read_bool(
+			port, "mipi-sdw-bra-flow-controlled");
+
+	dp0->simple_ch_prep_sm = fwnode_property_read_bool(
+			port, "mipi-sdw-simplified-channel-prepare-sm");
+
+	dp0->device_interrupts = fwnode_property_read_bool(
+			port, "mipi-sdw-imp-def-dp0-interrupts-supported");
+
+	return 0;
+}
+
+static int sdw_slave_read_dpn(struct sdw_slave *slave,
+		struct sdw_dpn_prop *dpn, int count, int ports, char *type)
+{
+	struct fwnode_handle *node;
+	u32 bit, i = 0;
+	int nval;
+	unsigned long addr;
+	char name[40];
+
+	addr = ports;
+	/* valid ports are 1 to 14 so apply mask */
+	addr &= GENMASK(14, 1);
+
+	for_each_set_bit(bit, &addr, 32) {
+		snprintf(name, sizeof(name),
+			"mipi-sdw-dp-%d-%s-subproperties", bit, type);
+
+		dpn[i].num = bit;
+
+		node = device_get_named_child_node(&slave->dev, name);
+		if (!node) {
+			dev_err(&slave->dev, "%s dpN not found\n", name);
+			return -EIO;
+		}
+
+		fwnode_property_read_u32(node, "mipi-sdw-port-max-wordlength",
+					&dpn[i].max_word);
+		fwnode_property_read_u32(node, "mipi-sdw-port-min-wordlength",
+					&dpn[i].min_word);
+
+		nval = fwnode_property_read_u32_array(node,
+				"mipi-sdw-port-wordlength-configs", NULL, 0);
+		if (nval > 0) {
+
+			dpn[i].num_words = nval;
+			dpn[i].words = devm_kcalloc(&slave->dev,
+					dpn[i].num_words,
+					sizeof(*dpn[i].words), GFP_KERNEL);
+			if (!dpn[i].words)
+				return -ENOMEM;
+
+			fwnode_property_read_u32_array(node,
+					"mipi-sdw-port-wordlength-configs",
+					dpn[i].words, dpn[i].num_words);
+		}
+
+		fwnode_property_read_u32(node, "mipi-sdw-data-port-type",
+				&dpn[i].type);
+
+		fwnode_property_read_u32(node,
+				"mipi-sdw-max-grouping-supported",
+				&dpn[i].max_grouping);
+
+		dpn[i].simple_ch_prep_sm = fwnode_property_read_bool(node,
+				"mipi-sdw-simplified-channelprepare-sm");
+
+		fwnode_property_read_u32(node,
+				"mipi-sdw-port-channelprepare-timeout",
+				&dpn[i].ch_prep_timeout);
+
+		fwnode_property_read_u32(node,
+				"mipi-sdw-imp-def-dpn-interrupts-supported",
+				&dpn[i].device_interrupts);
+
+		fwnode_property_read_u32(node, "mipi-sdw-min-channel-number",
+				&dpn[i].min_ch);
+
+		fwnode_property_read_u32(node, "mipi-sdw-max-channel-number",
+				&dpn[i].max_ch);
+
+		nval = fwnode_property_read_u32_array(node,
+				"mipi-sdw-channel-number-list", NULL, 0);
+		if (nval > 0) {
+
+			dpn[i].num_ch = nval;
+			dpn[i].ch = devm_kcalloc(&slave->dev, dpn[i].num_ch,
+					sizeof(*dpn[i].ch), GFP_KERNEL);
+			if (!dpn[i].ch)
+				return -ENOMEM;
+
+			fwnode_property_read_u32_array(node,
+					"mipi-sdw-channel-number-list",
+					dpn[i].ch, dpn[i].num_ch);
+		}
+
+		nval = fwnode_property_read_u32_array(node,
+				"mipi-sdw-channel-combination-list", NULL, 0);
+		if (nval > 0) {
+
+			dpn[i].num_ch_combinations = nval;
+			dpn[i].ch_combinations = devm_kcalloc(&slave->dev,
+					dpn[i].num_ch_combinations,
+					sizeof(*dpn[i].ch_combinations),
+					GFP_KERNEL);
+			if (!dpn[i].ch_combinations)
+				return -ENOMEM;
+
+			fwnode_property_read_u32_array(node,
+					"mipi-sdw-channel-combination-list",
+					dpn[i].ch_combinations,
+					dpn[i].num_ch_combinations);
+		}
+
+		fwnode_property_read_u32(node,
+				"mipi-sdw-modes-supported", &dpn[i].modes);
+
+		fwnode_property_read_u32(node, "mipi-sdw-max-async-buffer",
+				&dpn[i].max_async_buffer);
+
+		dpn[i].block_pack_mode = fwnode_property_read_bool(node,
+				"mipi-sdw-block-packing-mode");
+
+		fwnode_property_read_u32(node, "mipi-sdw-port-encoding-type",
+				&dpn[i].port_encoding);
+
+		/* TODO: Read audio mode */
+
+		i++;
+	}
+
+	return 0;
+}
+
+/**
+ * sdw_slave_read_prop() - Read Slave properties
+ * @slave: SDW Slave
+ */
+int sdw_slave_read_prop(struct sdw_slave *slave)
+{
+	struct sdw_slave_prop *prop = &slave->prop;
+	struct device *dev = &slave->dev;
+	struct fwnode_handle *port;
+	int num_of_ports, nval, i, dp0 = 0;
+
+	device_property_read_u32(dev, "mipi-sdw-sw-interface-revision",
+				&prop->mipi_revision);
+
+	prop->wake_capable = device_property_read_bool(dev,
+				"mipi-sdw-wake-up-unavailable");
+	prop->wake_capable = !prop->wake_capable;
+
+	prop->test_mode_capable = device_property_read_bool(dev,
+				"mipi-sdw-test-mode-supported");
+
+	prop->clk_stop_mode1 = false;
+	if (device_property_read_bool(dev,
+				"mipi-sdw-clock-stop-mode1-supported"))
+		prop->clk_stop_mode1 = true;
+
+	prop->simple_clk_stop_capable = device_property_read_bool(dev,
+			"mipi-sdw-simplified-clockstopprepare-sm-supported");
+
+	device_property_read_u32(dev, "mipi-sdw-clockstopprepare-timeout",
+			&prop->clk_stop_timeout);
+
+	device_property_read_u32(dev, "mipi-sdw-slave-channelprepare-timeout",
+			&prop->ch_prep_timeout);
+
+	device_property_read_u32(dev,
+			"mipi-sdw-clockstopprepare-hard-reset-behavior",
+			&prop->reset_behave);
+
+	prop->high_PHY_capable = device_property_read_bool(dev,
+			"mipi-sdw-highPHY-capable");
+
+	prop->paging_support = device_property_read_bool(dev,
+			"mipi-sdw-paging-support");
+
+	prop->bank_delay_support = device_property_read_bool(dev,
+			"mipi-sdw-bank-delay-support");
+
+	device_property_read_u32(dev,
+			"mipi-sdw-port15-read-behavior", &prop->p15_behave);
+
+	device_property_read_u32(dev, "mipi-sdw-master-count",
+				&prop->master_count);
+
+	device_property_read_u32(dev, "mipi-sdw-source-port-list",
+				&prop->source_ports);
+
+	device_property_read_u32(dev, "mipi-sdw-sink-port-list",
+				&prop->sink_ports);
+
+	/* Read dp0 properties */
+	port = device_get_named_child_node(dev, "mipi-sdw-dp-0-subproperties");
+	if (!port) {
+		dev_dbg(dev, "DP0 node not found!!\n");
+	} else {
+
+		prop->dp0_prop = devm_kzalloc(&slave->dev,
+				sizeof(*prop->dp0_prop), GFP_KERNEL);
+		if (!prop->dp0_prop)
+			return -ENOMEM;
+
+		sdw_slave_read_dp0(slave, port, prop->dp0_prop);
+		dp0 = 1;
+	}
+
+	/*
+	 * Based on each DPn port, get source and sink dpn properties.
+	 * Also, some ports can operate as both source or sink.
+	 */
+
+	/* Allocate memory for set bits in port lists */
+	nval = hweight32(prop->source_ports);
+	prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval,
+				sizeof(*prop->src_dpn_prop), GFP_KERNEL);
+	if (!prop->src_dpn_prop)
+		return -ENOMEM;
+
+	/* Read dpn properties for source port(s) */
+	sdw_slave_read_dpn(slave, prop->src_dpn_prop, nval,
+			prop->source_ports, "source");
+
+	nval = hweight32(prop->sink_ports);
+	prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval,
+				sizeof(*prop->sink_dpn_prop), GFP_KERNEL);
+	if (!prop->sink_dpn_prop)
+		return -ENOMEM;
+
+	/* Read dpn properties for sink port(s) */
+	sdw_slave_read_dpn(slave, prop->sink_dpn_prop, nval,
+			prop->sink_ports, "sink");
+
+	/* some ports are bidirectional so check total ports by ORing */
+	nval = prop->source_ports | prop->sink_ports;
+	num_of_ports = hweight32(nval) + dp0; /* add DP0 */
+
+	/* Allocate port_ready based on num_of_ports */
+	slave->port_ready = devm_kcalloc(&slave->dev, num_of_ports,
+				sizeof(*slave->port_ready), GFP_KERNEL);
+	if (!slave->port_ready)
+		return -ENOMEM;
+
+	/* Initialize completion */
+	for (i = 0; i < num_of_ports; i++)
+		init_completion(&slave->port_ready[i]);
+
+	return 0;
+}
+EXPORT_SYMBOL(sdw_slave_read_prop);