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path: root/drivers/hsi/hsi.c
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Diffstat (limited to 'drivers/hsi/hsi.c')
-rw-r--r--drivers/hsi/hsi.c275
1 files changed, 269 insertions, 6 deletions
diff --git a/drivers/hsi/hsi.c b/drivers/hsi/hsi.c
index 749f7b5c8179..fe9371271ce2 100644
--- a/drivers/hsi/hsi.c
+++ b/drivers/hsi/hsi.c
@@ -26,6 +26,8 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include "hsi_core.h"
static ssize_t modalias_show(struct device *dev,
@@ -50,7 +52,13 @@ static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
static int hsi_bus_match(struct device *dev, struct device_driver *driver)
{
- return strcmp(dev_name(dev), driver->name) == 0;
+ if (of_driver_match_device(dev, driver))
+ return true;
+
+ if (strcmp(dev_name(dev), driver->name) == 0)
+ return true;
+
+ return false;
}
static struct bus_type hsi_bus_type = {
@@ -62,18 +70,37 @@ static struct bus_type hsi_bus_type = {
static void hsi_client_release(struct device *dev)
{
- kfree(to_hsi_client(dev));
+ struct hsi_client *cl = to_hsi_client(dev);
+
+ kfree(cl->tx_cfg.channels);
+ kfree(cl->rx_cfg.channels);
+ kfree(cl);
}
-static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info)
+struct hsi_client *hsi_new_client(struct hsi_port *port,
+ struct hsi_board_info *info)
{
struct hsi_client *cl;
+ size_t size;
cl = kzalloc(sizeof(*cl), GFP_KERNEL);
if (!cl)
- return;
+ return NULL;
+
cl->tx_cfg = info->tx_cfg;
+ if (cl->tx_cfg.channels) {
+ size = cl->tx_cfg.num_channels * sizeof(*cl->tx_cfg.channels);
+ cl->tx_cfg.channels = kzalloc(size , GFP_KERNEL);
+ memcpy(cl->tx_cfg.channels, info->tx_cfg.channels, size);
+ }
+
cl->rx_cfg = info->rx_cfg;
+ if (cl->rx_cfg.channels) {
+ size = cl->rx_cfg.num_channels * sizeof(*cl->rx_cfg.channels);
+ cl->rx_cfg.channels = kzalloc(size , GFP_KERNEL);
+ memcpy(cl->rx_cfg.channels, info->rx_cfg.channels, size);
+ }
+
cl->device.bus = &hsi_bus_type;
cl->device.parent = &port->device;
cl->device.release = hsi_client_release;
@@ -85,7 +112,10 @@ static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info)
pr_err("hsi: failed to register client: %s\n", info->name);
put_device(&cl->device);
}
+
+ return cl;
}
+EXPORT_SYMBOL_GPL(hsi_new_client);
static void hsi_scan_board_info(struct hsi_controller *hsi)
{
@@ -101,12 +131,209 @@ static void hsi_scan_board_info(struct hsi_controller *hsi)
}
}
-static int hsi_remove_client(struct device *dev, void *data __maybe_unused)
+#ifdef CONFIG_OF
+static struct hsi_board_info hsi_char_dev_info = {
+ .name = "hsi_char",
+};
+
+static int hsi_of_property_parse_mode(struct device_node *client, char *name,
+ unsigned int *result)
+{
+ const char *mode;
+ int err;
+
+ err = of_property_read_string(client, name, &mode);
+ if (err < 0)
+ return err;
+
+ if (strcmp(mode, "stream") == 0)
+ *result = HSI_MODE_STREAM;
+ else if (strcmp(mode, "frame") == 0)
+ *result = HSI_MODE_FRAME;
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
+static int hsi_of_property_parse_flow(struct device_node *client, char *name,
+ unsigned int *result)
+{
+ const char *flow;
+ int err;
+
+ err = of_property_read_string(client, name, &flow);
+ if (err < 0)
+ return err;
+
+ if (strcmp(flow, "synchronized") == 0)
+ *result = HSI_FLOW_SYNC;
+ else if (strcmp(flow, "pipeline") == 0)
+ *result = HSI_FLOW_PIPE;
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
+static int hsi_of_property_parse_arb_mode(struct device_node *client,
+ char *name, unsigned int *result)
+{
+ const char *arb_mode;
+ int err;
+
+ err = of_property_read_string(client, name, &arb_mode);
+ if (err < 0)
+ return err;
+
+ if (strcmp(arb_mode, "round-robin") == 0)
+ *result = HSI_ARB_RR;
+ else if (strcmp(arb_mode, "priority") == 0)
+ *result = HSI_ARB_PRIO;
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
+static void hsi_add_client_from_dt(struct hsi_port *port,
+ struct device_node *client)
+{
+ struct hsi_client *cl;
+ struct hsi_channel channel;
+ struct property *prop;
+ char name[32];
+ int length, cells, err, i, max_chan, mode;
+
+ cl = kzalloc(sizeof(*cl), GFP_KERNEL);
+ if (!cl)
+ return;
+
+ err = of_modalias_node(client, name, sizeof(name));
+ if (err)
+ goto err;
+
+ dev_set_name(&cl->device, "%s", name);
+
+ err = hsi_of_property_parse_mode(client, "hsi-mode", &mode);
+ if (err) {
+ err = hsi_of_property_parse_mode(client, "hsi-rx-mode",
+ &cl->rx_cfg.mode);
+ if (err)
+ goto err;
+
+ err = hsi_of_property_parse_mode(client, "hsi-tx-mode",
+ &cl->tx_cfg.mode);
+ if (err)
+ goto err;
+ } else {
+ cl->rx_cfg.mode = mode;
+ cl->tx_cfg.mode = mode;
+ }
+
+ err = of_property_read_u32(client, "hsi-speed-kbps",
+ &cl->tx_cfg.speed);
+ if (err)
+ goto err;
+ cl->rx_cfg.speed = cl->tx_cfg.speed;
+
+ err = hsi_of_property_parse_flow(client, "hsi-flow",
+ &cl->rx_cfg.flow);
+ if (err)
+ goto err;
+
+ err = hsi_of_property_parse_arb_mode(client, "hsi-arb-mode",
+ &cl->rx_cfg.arb_mode);
+ if (err)
+ goto err;
+
+ prop = of_find_property(client, "hsi-channel-ids", &length);
+ if (!prop) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ cells = length / sizeof(u32);
+
+ cl->rx_cfg.num_channels = cells;
+ cl->tx_cfg.num_channels = cells;
+
+ cl->rx_cfg.channels = kzalloc(cells * sizeof(channel), GFP_KERNEL);
+ if (!cl->rx_cfg.channels) {
+ err = -ENOMEM;
+ goto err;
+ }
+
+ cl->tx_cfg.channels = kzalloc(cells * sizeof(channel), GFP_KERNEL);
+ if (!cl->tx_cfg.channels) {
+ err = -ENOMEM;
+ goto err2;
+ }
+
+ max_chan = 0;
+ for (i = 0; i < cells; i++) {
+ err = of_property_read_u32_index(client, "hsi-channel-ids", i,
+ &channel.id);
+ if (err)
+ goto err3;
+
+ err = of_property_read_string_index(client, "hsi-channel-names",
+ i, &channel.name);
+ if (err)
+ channel.name = NULL;
+
+ if (channel.id > max_chan)
+ max_chan = channel.id;
+
+ cl->rx_cfg.channels[i] = channel;
+ cl->tx_cfg.channels[i] = channel;
+ }
+
+ cl->rx_cfg.num_hw_channels = max_chan + 1;
+ cl->tx_cfg.num_hw_channels = max_chan + 1;
+
+ cl->device.bus = &hsi_bus_type;
+ cl->device.parent = &port->device;
+ cl->device.release = hsi_client_release;
+ cl->device.of_node = client;
+
+ if (device_register(&cl->device) < 0) {
+ pr_err("hsi: failed to register client: %s\n", name);
+ put_device(&cl->device);
+ goto err3;
+ }
+
+ return;
+
+err3:
+ kfree(cl->tx_cfg.channels);
+err2:
+ kfree(cl->rx_cfg.channels);
+err:
+ kfree(cl);
+ pr_err("hsi client: missing or incorrect of property: err=%d\n", err);
+}
+
+void hsi_add_clients_from_dt(struct hsi_port *port, struct device_node *clients)
+{
+ struct device_node *child;
+
+ /* register hsi-char device */
+ hsi_new_client(port, &hsi_char_dev_info);
+
+ for_each_available_child_of_node(clients, child)
+ hsi_add_client_from_dt(port, child);
+}
+EXPORT_SYMBOL_GPL(hsi_add_clients_from_dt);
+#endif
+
+int hsi_remove_client(struct device *dev, void *data __maybe_unused)
{
device_unregister(dev);
return 0;
}
+EXPORT_SYMBOL_GPL(hsi_remove_client);
static int hsi_remove_port(struct device *dev, void *data __maybe_unused)
{
@@ -130,6 +357,16 @@ static void hsi_port_release(struct device *dev)
}
/**
+ * hsi_unregister_port - Unregister an HSI port
+ * @port: The HSI port to unregister
+ */
+void hsi_port_unregister_clients(struct hsi_port *port)
+{
+ device_for_each_child(&port->device, NULL, hsi_remove_client);
+}
+EXPORT_SYMBOL_GPL(hsi_port_unregister_clients);
+
+/**
* hsi_unregister_controller - Unregister an HSI controller
* @hsi: The HSI controller to register
*/
@@ -472,7 +709,7 @@ int hsi_unregister_port_event(struct hsi_client *cl)
EXPORT_SYMBOL_GPL(hsi_unregister_port_event);
/**
- * hsi_event -Notifies clients about port events
+ * hsi_event - Notifies clients about port events
* @port: Port where the event occurred
* @event: The event type
*
@@ -492,6 +729,32 @@ int hsi_event(struct hsi_port *port, unsigned long event)
}
EXPORT_SYMBOL_GPL(hsi_event);
+/**
+ * hsi_get_channel_id_by_name - acquire channel id by channel name
+ * @cl: HSI client, which uses the channel
+ * @name: name the channel is known under
+ *
+ * Clients can call this function to get the hsi channel ids similar to
+ * requesting IRQs or GPIOs by name. This function assumes the same
+ * channel configuration is used for RX and TX.
+ *
+ * Returns -errno on error or channel id on success.
+ */
+int hsi_get_channel_id_by_name(struct hsi_client *cl, char *name)
+{
+ int i;
+
+ if (!cl->rx_cfg.channels)
+ return -ENOENT;
+
+ for (i = 0; i < cl->rx_cfg.num_channels; i++)
+ if (!strcmp(cl->rx_cfg.channels[i].name, name))
+ return cl->rx_cfg.channels[i].id;
+
+ return -ENXIO;
+}
+EXPORT_SYMBOL_GPL(hsi_get_channel_id_by_name);
+
static int __init hsi_init(void)
{
return bus_register(&hsi_bus_type);