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authorCarlos Chinea <carlos.chinea@nokia.com>2010-04-16 19:01:02 +0300
committerCarlos Chinea <carlos.chinea@nokia.com>2012-01-05 15:42:13 +0200
commita056ab8c7a00a0ffc52e9573bf01257004c2d08c (patch)
treec5ef0df1efcbbe03469257f2cfb4be1fb05809f1 /drivers/hsi
parent805a6af8dba5dfdd35ec35dc52ec0122400b2610 (diff)
downloadlinaro-lsk-a056ab8c7a00a0ffc52e9573bf01257004c2d08c.tar.gz
HSI: hsi: Introducing HSI framework
Adds HSI framework in to the linux kernel. High Speed Synchronous Serial Interface (HSI) is a serial interface mainly used for connecting application engines (APE) with cellular modem engines (CMT) in cellular handsets. HSI provides multiplexing for up to 16 logical channels, low-latency and full duplex communication. Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com> Acked-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/hsi')
-rw-r--r--drivers/hsi/Kconfig17
-rw-r--r--drivers/hsi/Makefile5
-rw-r--r--drivers/hsi/hsi.c494
-rw-r--r--drivers/hsi/hsi_boardinfo.c62
-rw-r--r--drivers/hsi/hsi_core.h35
5 files changed, 613 insertions, 0 deletions
diff --git a/drivers/hsi/Kconfig b/drivers/hsi/Kconfig
new file mode 100644
index 00000000000..937062e8bcd
--- /dev/null
+++ b/drivers/hsi/Kconfig
@@ -0,0 +1,17 @@
+#
+# HSI driver configuration
+#
+menuconfig HSI
+ tristate "HSI support"
+ ---help---
+ The "High speed synchronous Serial Interface" is
+ synchronous serial interface used mainly to connect
+ application engines and cellular modems.
+
+if HSI
+
+config HSI_BOARDINFO
+ bool
+ default y
+
+endif # HSI
diff --git a/drivers/hsi/Makefile b/drivers/hsi/Makefile
new file mode 100644
index 00000000000..ed94a3a334a
--- /dev/null
+++ b/drivers/hsi/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for HSI
+#
+obj-$(CONFIG_HSI_BOARDINFO) += hsi_boardinfo.o
+obj-$(CONFIG_HSI) += hsi.o
diff --git a/drivers/hsi/hsi.c b/drivers/hsi/hsi.c
new file mode 100644
index 00000000000..4e2d79b7933
--- /dev/null
+++ b/drivers/hsi/hsi.c
@@ -0,0 +1,494 @@
+/*
+ * 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/rwsem.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/kobject.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include "hsi_core.h"
+
+static struct device_type hsi_ctrl = {
+ .name = "hsi_controller",
+};
+
+static struct device_type hsi_cl = {
+ .name = "hsi_client",
+};
+
+static struct device_type hsi_port = {
+ .name = "hsi_port",
+};
+
+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 struct device_attribute hsi_bus_dev_attrs[] = {
+ __ATTR_RO(modalias),
+ __ATTR_NULL,
+};
+
+static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ if (dev->type == &hsi_cl)
+ add_uevent_var(env, "MODALIAS=hsi:%s", dev_name(dev));
+
+ return 0;
+}
+
+static int hsi_bus_match(struct device *dev, struct device_driver *driver)
+{
+ return strcmp(dev_name(dev), driver->name) == 0;
+}
+
+static struct bus_type hsi_bus_type = {
+ .name = "hsi",
+ .dev_attrs = hsi_bus_dev_attrs,
+ .match = hsi_bus_match,
+ .uevent = hsi_bus_uevent,
+};
+
+static void hsi_client_release(struct device *dev)
+{
+ kfree(to_hsi_client(dev));
+}
+
+static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info)
+{
+ struct hsi_client *cl;
+ unsigned long flags;
+
+ cl = kzalloc(sizeof(*cl), GFP_KERNEL);
+ if (!cl)
+ return;
+ cl->device.type = &hsi_cl;
+ cl->tx_cfg = info->tx_cfg;
+ cl->rx_cfg = info->rx_cfg;
+ cl->device.bus = &hsi_bus_type;
+ cl->device.parent = &port->device;
+ cl->device.release = hsi_client_release;
+ dev_set_name(&cl->device, info->name);
+ cl->device.platform_data = info->platform_data;
+ spin_lock_irqsave(&port->clock, flags);
+ list_add_tail(&cl->link, &port->clients);
+ spin_unlock_irqrestore(&port->clock, flags);
+ 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);
+ kfree(cl);
+ }
+}
+
+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);
+ }
+}
+
+static int hsi_remove_client(struct device *dev, void *data __maybe_unused)
+{
+ struct hsi_client *cl = to_hsi_client(dev);
+ struct hsi_port *port = to_hsi_port(dev->parent);
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->clock, flags);
+ list_del(&cl->link);
+ spin_unlock_irqrestore(&port->clock, flags);
+ device_unregister(dev);
+
+ return 0;
+}
+
+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 __maybe_unused)
+{
+}
+
+static void hsi_port_release(struct device *dev __maybe_unused)
+{
+}
+
+/**
+ * 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;
+
+ hsi->device.type = &hsi_ctrl;
+ hsi->device.bus = &hsi_bus_type;
+ hsi->device.release = hsi_controller_release;
+ err = device_register(&hsi->device);
+ if (err < 0)
+ return err;
+ for (i = 0; i < hsi->num_ports; i++) {
+ hsi->port[i].device.parent = &hsi->device;
+ hsi->port[i].device.bus = &hsi_bus_type;
+ hsi->port[i].device.release = hsi_port_release;
+ hsi->port[i].device.type = &hsi_port;
+ INIT_LIST_HEAD(&hsi->port[i].clients);
+ spin_lock_init(&hsi->port[i].clock);
+ err = device_register(&hsi->port[i].device);
+ if (err < 0)
+ goto out;
+ }
+ /* Populate HSI bus with HSI clients */
+ hsi_scan_board_info(hsi);
+
+ return 0;
+out:
+ hsi_unregister_controller(hsi);
+
+ 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_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;
+
+ port = kzalloc(sizeof(*port)*n_ports, flags);
+ if (!port)
+ return NULL;
+ hsi = kzalloc(sizeof(*hsi), flags);
+ if (!hsi)
+ goto out;
+ for (i = 0; i < n_ports; i++) {
+ dev_set_name(&port[i].device, "port%d", i);
+ 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);
+ }
+ hsi->num_ports = n_ports;
+ hsi->port = port;
+
+ return hsi;
+out:
+ kfree(port);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(hsi_alloc_controller);
+
+/**
+ * hsi_free_controller - Free an HSI controller
+ * @hsi: Pointer to HSI controller
+ */
+void hsi_free_controller(struct hsi_controller *hsi)
+{
+ if (!hsi)
+ return;
+
+ kfree(hsi->port);
+ kfree(hsi);
+}
+EXPORT_SYMBOL_GPL(hsi_free_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_start_rx(struct hsi_client *cl, void *data __maybe_unused)
+{
+ if (cl->hsi_start_rx)
+ (*cl->hsi_start_rx)(cl);
+
+ return 0;
+}
+
+static int hsi_stop_rx(struct hsi_client *cl, void *data __maybe_unused)
+{
+ if (cl->hsi_stop_rx)
+ (*cl->hsi_stop_rx)(cl);
+
+ return 0;
+}
+
+static int hsi_port_for_each_client(struct hsi_port *port, void *data,
+ int (*fn)(struct hsi_client *cl, void *data))
+{
+ struct hsi_client *cl;
+
+ spin_lock(&port->clock);
+ list_for_each_entry(cl, &port->clients, link) {
+ spin_unlock(&port->clock);
+ (*fn)(cl, data);
+ spin_lock(&port->clock);
+ }
+ spin_unlock(&port->clock);
+
+ return 0;
+}
+
+/**
+ * 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
+ */
+void hsi_event(struct hsi_port *port, unsigned int event)
+{
+ int (*fn)(struct hsi_client *cl, void *data);
+
+ switch (event) {
+ case HSI_EVENT_START_RX:
+ fn = hsi_start_rx;
+ break;
+ case HSI_EVENT_STOP_RX:
+ fn = hsi_stop_rx;
+ break;
+ default:
+ return;
+ }
+ hsi_port_for_each_client(port, NULL, fn);
+}
+EXPORT_SYMBOL_GPL(hsi_event);
+
+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");
diff --git a/drivers/hsi/hsi_boardinfo.c b/drivers/hsi/hsi_boardinfo.c
new file mode 100644
index 00000000000..e56bc6da5f9
--- /dev/null
+++ b/drivers/hsi/hsi_boardinfo.c
@@ -0,0 +1,62 @@
+/*
+ * HSI clients registration interface
+ *
+ * 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/list.h>
+#include <linux/slab.h>
+#include "hsi_core.h"
+
+/*
+ * hsi_board_list is only used internally by the HSI framework.
+ * No one else is allowed to make use of it.
+ */
+LIST_HEAD(hsi_board_list);
+EXPORT_SYMBOL_GPL(hsi_board_list);
+
+/**
+ * hsi_register_board_info - Register HSI clients information
+ * @info: Array of HSI clients on the board
+ * @len: Length of the array
+ *
+ * HSI clients are statically declared and registered on board files.
+ *
+ * HSI clients will be automatically registered to the HSI bus once the
+ * controller and the port where the clients wishes to attach are registered
+ * to it.
+ *
+ * Return -errno on failure, 0 on success.
+ */
+int __init hsi_register_board_info(struct hsi_board_info const *info,
+ unsigned int len)
+{
+ struct hsi_cl_info *cl_info;
+
+ cl_info = kzalloc(sizeof(*cl_info) * len, GFP_KERNEL);
+ if (!cl_info)
+ return -ENOMEM;
+
+ for (; len; len--, info++, cl_info++) {
+ cl_info->info = *info;
+ list_add_tail(&cl_info->list, &hsi_board_list);
+ }
+
+ return 0;
+}
diff --git a/drivers/hsi/hsi_core.h b/drivers/hsi/hsi_core.h
new file mode 100644
index 00000000000..ab5c2fb175f
--- /dev/null
+++ b/drivers/hsi/hsi_core.h
@@ -0,0 +1,35 @@
+/*
+ * HSI framework internal interfaces,
+ *
+ * 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
+ */
+
+#ifndef __LINUX_HSI_CORE_H__
+#define __LINUX_HSI_CORE_H__
+
+#include <linux/hsi/hsi.h>
+
+struct hsi_cl_info {
+ struct list_head list;
+ struct hsi_board_info info;
+};
+
+extern struct list_head hsi_board_list;
+
+#endif /* __LINUX_HSI_CORE_H__ */