diff options
Diffstat (limited to 'drivers/hsi/hsi.c')
| -rw-r--r-- | drivers/hsi/hsi.c | 781 |
1 files changed, 0 insertions, 781 deletions
diff --git a/drivers/hsi/hsi.c b/drivers/hsi/hsi.c deleted file mode 100644 index df380d55c..000000000 --- a/drivers/hsi/hsi.c +++ /dev/null @@ -1,781 +0,0 @@ -/* - * HSI core. - * - * Copyright (C) 2010 Nokia Corporation. All rights reserved. - * - * Contact: Carlos Chinea <carlos.chinea@nokia.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA - * 02110-1301 USA - */ -#include <linux/hsi/hsi.h> -#include <linux/compiler.h> -#include <linux/list.h> -#include <linux/kobject.h> -#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, - struct device_attribute *a __maybe_unused, char *buf) -{ - return sprintf(buf, "hsi:%s\n", dev_name(dev)); -} -static DEVICE_ATTR_RO(modalias); - -static struct attribute *hsi_bus_dev_attrs[] = { - &dev_attr_modalias.attr, - NULL, -}; -ATTRIBUTE_GROUPS(hsi_bus_dev); - -static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) -{ - add_uevent_var(env, "MODALIAS=hsi:%s", dev_name(dev)); - - return 0; -} - -static int hsi_bus_match(struct device *dev, struct device_driver *driver) -{ - 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 = { - .name = "hsi", - .dev_groups = hsi_bus_dev_groups, - .match = hsi_bus_match, - .uevent = hsi_bus_uevent, -}; - -static void hsi_client_release(struct device *dev) -{ - struct hsi_client *cl = to_hsi_client(dev); - - kfree(cl->tx_cfg.channels); - kfree(cl->rx_cfg.channels); - kfree(cl); -} - -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) - goto err; - - 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); - if (!cl->tx_cfg.channels) - goto err_tx; - 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); - if (!cl->rx_cfg.channels) - goto err_rx; - 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; - dev_set_name(&cl->device, "%s", info->name); - cl->device.platform_data = info->platform_data; - if (info->archdata) - cl->device.archdata = *info->archdata; - if (device_register(&cl->device) < 0) { - pr_err("hsi: failed to register client: %s\n", info->name); - put_device(&cl->device); - } - - return cl; -err_rx: - kfree(cl->tx_cfg.channels); -err_tx: - kfree(cl); -err: - return NULL; -} -EXPORT_SYMBOL_GPL(hsi_new_client); - -static void hsi_scan_board_info(struct hsi_controller *hsi) -{ - struct hsi_cl_info *cl_info; - struct hsi_port *p; - - list_for_each_entry(cl_info, &hsi_board_list, list) - if (cl_info->info.hsi_id == hsi->id) { - p = hsi_find_port_num(hsi, cl_info->info.port); - if (!p) - continue; - hsi_new_client(p, &cl_info->info); - } -} - -#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); - } - - 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) -{ - device_for_each_child(dev, NULL, hsi_remove_client); - device_unregister(dev); - - return 0; -} - -static void hsi_controller_release(struct device *dev) -{ - struct hsi_controller *hsi = to_hsi_controller(dev); - - kfree(hsi->port); - kfree(hsi); -} - -static void hsi_port_release(struct device *dev) -{ - kfree(to_hsi_port(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 - */ -void hsi_unregister_controller(struct hsi_controller *hsi) -{ - device_for_each_child(&hsi->device, NULL, hsi_remove_port); - device_unregister(&hsi->device); -} -EXPORT_SYMBOL_GPL(hsi_unregister_controller); - -/** - * hsi_register_controller - Register an HSI controller and its ports - * @hsi: The HSI controller to register - * - * Returns -errno on failure, 0 on success. - */ -int hsi_register_controller(struct hsi_controller *hsi) -{ - unsigned int i; - int err; - - err = device_add(&hsi->device); - if (err < 0) - return err; - for (i = 0; i < hsi->num_ports; i++) { - hsi->port[i]->device.parent = &hsi->device; - err = device_add(&hsi->port[i]->device); - if (err < 0) - goto out; - } - /* Populate HSI bus with HSI clients */ - hsi_scan_board_info(hsi); - - return 0; -out: - while (i-- > 0) - device_del(&hsi->port[i]->device); - device_del(&hsi->device); - - return err; -} -EXPORT_SYMBOL_GPL(hsi_register_controller); - -/** - * hsi_register_client_driver - Register an HSI client to the HSI bus - * @drv: HSI client driver to register - * - * Returns -errno on failure, 0 on success. - */ -int hsi_register_client_driver(struct hsi_client_driver *drv) -{ - drv->driver.bus = &hsi_bus_type; - - return driver_register(&drv->driver); -} -EXPORT_SYMBOL_GPL(hsi_register_client_driver); - -static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused) -{ - return 0; -} - -static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused) -{ - return 0; -} - -/** - * hsi_put_controller - Free an HSI controller - * - * @hsi: Pointer to the HSI controller to freed - * - * HSI controller drivers should only use this function if they need - * to free their allocated hsi_controller structures before a successful - * call to hsi_register_controller. Other use is not allowed. - */ -void hsi_put_controller(struct hsi_controller *hsi) -{ - unsigned int i; - - if (!hsi) - return; - - for (i = 0; i < hsi->num_ports; i++) - if (hsi->port && hsi->port[i]) - put_device(&hsi->port[i]->device); - put_device(&hsi->device); -} -EXPORT_SYMBOL_GPL(hsi_put_controller); - -/** - * hsi_alloc_controller - Allocate an HSI controller and its ports - * @n_ports: Number of ports on the HSI controller - * @flags: Kernel allocation flags - * - * Return NULL on failure or a pointer to an hsi_controller on success. - */ -struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags) -{ - struct hsi_controller *hsi; - struct hsi_port **port; - unsigned int i; - - if (!n_ports) - return NULL; - - hsi = kzalloc(sizeof(*hsi), flags); - if (!hsi) - return NULL; - port = kzalloc(sizeof(*port)*n_ports, flags); - if (!port) { - kfree(hsi); - return NULL; - } - hsi->num_ports = n_ports; - hsi->port = port; - hsi->device.release = hsi_controller_release; - device_initialize(&hsi->device); - - for (i = 0; i < n_ports; i++) { - port[i] = kzalloc(sizeof(**port), flags); - if (port[i] == NULL) - goto out; - port[i]->num = i; - port[i]->async = hsi_dummy_msg; - port[i]->setup = hsi_dummy_cl; - port[i]->flush = hsi_dummy_cl; - port[i]->start_tx = hsi_dummy_cl; - port[i]->stop_tx = hsi_dummy_cl; - port[i]->release = hsi_dummy_cl; - mutex_init(&port[i]->lock); - ATOMIC_INIT_NOTIFIER_HEAD(&port[i]->n_head); - dev_set_name(&port[i]->device, "port%d", i); - hsi->port[i]->device.release = hsi_port_release; - device_initialize(&hsi->port[i]->device); - } - - return hsi; -out: - hsi_put_controller(hsi); - - return NULL; -} -EXPORT_SYMBOL_GPL(hsi_alloc_controller); - -/** - * hsi_free_msg - Free an HSI message - * @msg: Pointer to the HSI message - * - * Client is responsible to free the buffers pointed by the scatterlists. - */ -void hsi_free_msg(struct hsi_msg *msg) -{ - if (!msg) - return; - sg_free_table(&msg->sgt); - kfree(msg); -} -EXPORT_SYMBOL_GPL(hsi_free_msg); - -/** - * hsi_alloc_msg - Allocate an HSI message - * @nents: Number of memory entries - * @flags: Kernel allocation flags - * - * nents can be 0. This mainly makes sense for read transfer. - * In that case, HSI drivers will call the complete callback when - * there is data to be read without consuming it. - * - * Return NULL on failure or a pointer to an hsi_msg on success. - */ -struct hsi_msg *hsi_alloc_msg(unsigned int nents, gfp_t flags) -{ - struct hsi_msg *msg; - int err; - - msg = kzalloc(sizeof(*msg), flags); - if (!msg) - return NULL; - - if (!nents) - return msg; - - err = sg_alloc_table(&msg->sgt, nents, flags); - if (unlikely(err)) { - kfree(msg); - msg = NULL; - } - - return msg; -} -EXPORT_SYMBOL_GPL(hsi_alloc_msg); - -/** - * hsi_async - Submit an HSI transfer to the controller - * @cl: HSI client sending the transfer - * @msg: The HSI transfer passed to controller - * - * The HSI message must have the channel, ttype, complete and destructor - * fields set beforehand. If nents > 0 then the client has to initialize - * also the scatterlists to point to the buffers to write to or read from. - * - * HSI controllers relay on pre-allocated buffers from their clients and they - * do not allocate buffers on their own. - * - * Once the HSI message transfer finishes, the HSI controller calls the - * complete callback with the status and actual_len fields of the HSI message - * updated. The complete callback can be called before returning from - * hsi_async. - * - * Returns -errno on failure or 0 on success - */ -int hsi_async(struct hsi_client *cl, struct hsi_msg *msg) -{ - struct hsi_port *port = hsi_get_port(cl); - - if (!hsi_port_claimed(cl)) - return -EACCES; - - WARN_ON_ONCE(!msg->destructor || !msg->complete); - msg->cl = cl; - - return port->async(msg); -} -EXPORT_SYMBOL_GPL(hsi_async); - -/** - * hsi_claim_port - Claim the HSI client's port - * @cl: HSI client that wants to claim its port - * @share: Flag to indicate if the client wants to share the port or not. - * - * Returns -errno on failure, 0 on success. - */ -int hsi_claim_port(struct hsi_client *cl, unsigned int share) -{ - struct hsi_port *port = hsi_get_port(cl); - int err = 0; - - mutex_lock(&port->lock); - if ((port->claimed) && (!port->shared || !share)) { - err = -EBUSY; - goto out; - } - if (!try_module_get(to_hsi_controller(port->device.parent)->owner)) { - err = -ENODEV; - goto out; - } - port->claimed++; - port->shared = !!share; - cl->pclaimed = 1; -out: - mutex_unlock(&port->lock); - - return err; -} -EXPORT_SYMBOL_GPL(hsi_claim_port); - -/** - * hsi_release_port - Release the HSI client's port - * @cl: HSI client which previously claimed its port - */ -void hsi_release_port(struct hsi_client *cl) -{ - struct hsi_port *port = hsi_get_port(cl); - - mutex_lock(&port->lock); - /* Allow HW driver to do some cleanup */ - port->release(cl); - if (cl->pclaimed) - port->claimed--; - BUG_ON(port->claimed < 0); - cl->pclaimed = 0; - if (!port->claimed) - port->shared = 0; - module_put(to_hsi_controller(port->device.parent)->owner); - mutex_unlock(&port->lock); -} -EXPORT_SYMBOL_GPL(hsi_release_port); - -static int hsi_event_notifier_call(struct notifier_block *nb, - unsigned long event, void *data __maybe_unused) -{ - struct hsi_client *cl = container_of(nb, struct hsi_client, nb); - - (*cl->ehandler)(cl, event); - - return 0; -} - -/** - * hsi_register_port_event - Register a client to receive port events - * @cl: HSI client that wants to receive port events - * @handler: Event handler callback - * - * Clients should register a callback to be able to receive - * events from the ports. Registration should happen after - * claiming the port. - * The handler can be called in interrupt context. - * - * Returns -errno on error, or 0 on success. - */ -int hsi_register_port_event(struct hsi_client *cl, - void (*handler)(struct hsi_client *, unsigned long)) -{ - struct hsi_port *port = hsi_get_port(cl); - - if (!handler || cl->ehandler) - return -EINVAL; - if (!hsi_port_claimed(cl)) - return -EACCES; - cl->ehandler = handler; - cl->nb.notifier_call = hsi_event_notifier_call; - - return atomic_notifier_chain_register(&port->n_head, &cl->nb); -} -EXPORT_SYMBOL_GPL(hsi_register_port_event); - -/** - * hsi_unregister_port_event - Stop receiving port events for a client - * @cl: HSI client that wants to stop receiving port events - * - * Clients should call this function before releasing their associated - * port. - * - * Returns -errno on error, or 0 on success. - */ -int hsi_unregister_port_event(struct hsi_client *cl) -{ - struct hsi_port *port = hsi_get_port(cl); - int err; - - WARN_ON(!hsi_port_claimed(cl)); - - err = atomic_notifier_chain_unregister(&port->n_head, &cl->nb); - if (!err) - cl->ehandler = NULL; - - return err; -} -EXPORT_SYMBOL_GPL(hsi_unregister_port_event); - -/** - * hsi_event - Notifies clients about port events - * @port: Port where the event occurred - * @event: The event type - * - * Clients should not be concerned about wake line behavior. However, due - * to a race condition in HSI HW protocol, clients need to be notified - * about wake line changes, so they can implement a workaround for it. - * - * Events: - * HSI_EVENT_START_RX - Incoming wake line high - * HSI_EVENT_STOP_RX - Incoming wake line down - * - * Returns -errno on error, or 0 on success. - */ -int hsi_event(struct hsi_port *port, unsigned long event) -{ - return atomic_notifier_call_chain(&port->n_head, event, NULL); -} -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); -} -postcore_initcall(hsi_init); - -static void __exit hsi_exit(void) -{ - bus_unregister(&hsi_bus_type); -} -module_exit(hsi_exit); - -MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); -MODULE_DESCRIPTION("High-speed Synchronous Serial Interface (HSI) framework"); -MODULE_LICENSE("GPL v2"); |