slimbus: Add snapshot of slimbus driver.
This snapshot is taken as of msm-4.4 'commit <3c7400dc73db>
("Merge "diag: dci: Fix possible out of bound access"")'.
CRs-Fixed: 2002163
Change-Id: I7e91941a324206b964a55558a1a9ab2fed7fb3e9
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
diff --git a/drivers/slimbus/slimbus.c b/drivers/slimbus/slimbus.c
new file mode 100644
index 0000000..ecb1056
--- /dev/null
+++ b/drivers/slimbus/slimbus.c
@@ -0,0 +1,3439 @@
+/* Copyright (c) 2011-2017, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/completion.h>
+#include <linux/idr.h>
+#include <linux/pm_runtime.h>
+#include <linux/slimbus/slimbus.h>
+
+#define SLIM_PORT_HDL(la, f, p) ((la)<<24 | (f) << 16 | (p))
+
+#define SLIM_HDL_TO_LA(hdl) ((u32)((hdl) & 0xFF000000) >> 24)
+#define SLIM_HDL_TO_FLOW(hdl) (((u32)(hdl) & 0xFF0000) >> 16)
+#define SLIM_HDL_TO_PORT(hdl) ((u32)(hdl) & 0xFF)
+
+#define SLIM_HDL_TO_CHIDX(hdl) ((u16)(hdl) & 0xFF)
+#define SLIM_GRP_TO_NCHAN(hdl) ((u16)(hdl >> 8) & 0xFF)
+
+#define SLIM_SLAVE_PORT(p, la) (((la)<<16) | (p))
+#define SLIM_MGR_PORT(p) ((0xFF << 16) | (p))
+#define SLIM_LA_MANAGER 0xFF
+
+#define SLIM_START_GRP (1 << 8)
+#define SLIM_END_GRP (1 << 9)
+
+#define SLIM_MAX_INTR_COEFF_3 (SLIM_SL_PER_SUPERFRAME/3)
+#define SLIM_MAX_INTR_COEFF_1 SLIM_SL_PER_SUPERFRAME
+
+static DEFINE_MUTEX(slim_lock);
+static DEFINE_IDR(ctrl_idr);
+static struct device_type slim_dev_type;
+static struct device_type slim_ctrl_type;
+
+#define DEFINE_SLIM_LDEST_TXN(name, mc, len, rl, rbuf, wbuf, la) \
+ struct slim_msg_txn name = { rl, 0, mc, SLIM_MSG_DEST_LOGICALADDR, 0,\
+ len, 0, la, false, rbuf, wbuf, NULL, }
+
+#define DEFINE_SLIM_BCAST_TXN(name, mc, len, rl, rbuf, wbuf, la) \
+ struct slim_msg_txn name = { rl, 0, mc, SLIM_MSG_DEST_BROADCAST, 0,\
+ len, 0, la, false, rbuf, wbuf, NULL, }
+
+static const struct slim_device_id *slim_match(const struct slim_device_id *id,
+ const struct slim_device *slim_dev)
+{
+ while (id->name[0]) {
+ if (strcmp(slim_dev->name, id->name) == 0)
+ return id;
+ id++;
+ }
+ return NULL;
+}
+
+const struct slim_device_id *slim_get_device_id(const struct slim_device *sdev)
+{
+ const struct slim_driver *sdrv = to_slim_driver(sdev->dev.driver);
+
+ return slim_match(sdrv->id_table, sdev);
+}
+EXPORT_SYMBOL(slim_get_device_id);
+
+static int slim_device_match(struct device *dev, struct device_driver *driver)
+{
+ struct slim_device *slim_dev;
+ struct slim_driver *drv = to_slim_driver(driver);
+
+ if (dev->type == &slim_dev_type)
+ slim_dev = to_slim_device(dev);
+ else
+ return 0;
+ if (drv->id_table)
+ return slim_match(drv->id_table, slim_dev) != NULL;
+
+ if (driver->name)
+ return strcmp(slim_dev->name, driver->name) == 0;
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int slim_legacy_suspend(struct device *dev, pm_message_t mesg)
+{
+ struct slim_device *slim_dev = NULL;
+ struct slim_driver *driver;
+
+ if (dev->type == &slim_dev_type)
+ slim_dev = to_slim_device(dev);
+
+ if (!slim_dev || !dev->driver)
+ return 0;
+
+ driver = to_slim_driver(dev->driver);
+ if (!driver->suspend)
+ return 0;
+
+ return driver->suspend(slim_dev, mesg);
+}
+
+static int slim_legacy_resume(struct device *dev)
+{
+ struct slim_device *slim_dev = NULL;
+ struct slim_driver *driver;
+
+ if (dev->type == &slim_dev_type)
+ slim_dev = to_slim_device(dev);
+
+ if (!slim_dev || !dev->driver)
+ return 0;
+
+ driver = to_slim_driver(dev->driver);
+ if (!driver->resume)
+ return 0;
+
+ return driver->resume(slim_dev);
+}
+
+static int slim_pm_suspend(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm)
+ return pm_generic_suspend(dev);
+ else
+ return slim_legacy_suspend(dev, PMSG_SUSPEND);
+}
+
+static int slim_pm_resume(struct device *dev)
+{
+ const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+
+ if (pm)
+ return pm_generic_resume(dev);
+ else
+ return slim_legacy_resume(dev);
+}
+
+#else
+#define slim_pm_suspend NULL
+#define slim_pm_resume NULL
+#endif
+
+static const struct dev_pm_ops slimbus_pm = {
+ .suspend = slim_pm_suspend,
+ .resume = slim_pm_resume,
+ SET_RUNTIME_PM_OPS(
+ pm_generic_suspend,
+ pm_generic_resume,
+ NULL
+ )
+};
+struct bus_type slimbus_type = {
+ .name = "slimbus",
+ .match = slim_device_match,
+ .pm = &slimbus_pm,
+};
+EXPORT_SYMBOL(slimbus_type);
+
+struct device slimbus_dev = {
+ .init_name = "slimbus",
+};
+
+static void __exit slimbus_exit(void)
+{
+ device_unregister(&slimbus_dev);
+ bus_unregister(&slimbus_type);
+}
+
+static int __init slimbus_init(void)
+{
+ int retval;
+
+ retval = bus_register(&slimbus_type);
+ if (!retval)
+ retval = device_register(&slimbus_dev);
+
+ if (retval)
+ bus_unregister(&slimbus_type);
+
+ return retval;
+}
+postcore_initcall(slimbus_init);
+module_exit(slimbus_exit);
+
+static int slim_drv_probe(struct device *dev)
+{
+ const struct slim_driver *sdrv = to_slim_driver(dev->driver);
+ struct slim_device *sbdev = to_slim_device(dev);
+ struct slim_controller *ctrl = sbdev->ctrl;
+
+ if (sdrv->probe) {
+ int ret;
+
+ ret = sdrv->probe(sbdev);
+ if (ret)
+ return ret;
+ if (sdrv->device_up)
+ queue_work(ctrl->wq, &sbdev->wd);
+ return 0;
+ }
+ return -ENODEV;
+}
+
+static int slim_drv_remove(struct device *dev)
+{
+ const struct slim_driver *sdrv = to_slim_driver(dev->driver);
+ struct slim_device *sbdev = to_slim_device(dev);
+
+ sbdev->notified = false;
+ if (sdrv->remove)
+ return sdrv->remove(to_slim_device(dev));
+ return -ENODEV;
+}
+
+static void slim_drv_shutdown(struct device *dev)
+{
+ const struct slim_driver *sdrv = to_slim_driver(dev->driver);
+
+ if (sdrv->shutdown)
+ sdrv->shutdown(to_slim_device(dev));
+}
+
+/*
+ * slim_driver_register: Client driver registration with slimbus
+ * @drv:Client driver to be associated with client-device.
+ * This API will register the client driver with the slimbus
+ * It is called from the driver's module-init function.
+ */
+int slim_driver_register(struct slim_driver *drv)
+{
+ drv->driver.bus = &slimbus_type;
+ if (drv->probe)
+ drv->driver.probe = slim_drv_probe;
+
+ if (drv->remove)
+ drv->driver.remove = slim_drv_remove;
+
+ if (drv->shutdown)
+ drv->driver.shutdown = slim_drv_shutdown;
+
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL(slim_driver_register);
+
+/*
+ * slim_driver_unregister: Undo effects of slim_driver_register
+ * @drv: Client driver to be unregistered
+ */
+void slim_driver_unregister(struct slim_driver *drv)
+{
+ if (drv)
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL(slim_driver_unregister);
+
+#define slim_ctrl_attr_gr NULL
+
+static void slim_ctrl_release(struct device *dev)
+{
+ struct slim_controller *ctrl = to_slim_controller(dev);
+
+ complete(&ctrl->dev_released);
+}
+
+static struct device_type slim_ctrl_type = {
+ .groups = slim_ctrl_attr_gr,
+ .release = slim_ctrl_release,
+};
+
+static struct slim_controller *slim_ctrl_get(struct slim_controller *ctrl)
+{
+ if (!ctrl || !get_device(&ctrl->dev))
+ return NULL;
+
+ return ctrl;
+}
+
+static void slim_ctrl_put(struct slim_controller *ctrl)
+{
+ if (ctrl)
+ put_device(&ctrl->dev);
+}
+
+#define slim_device_attr_gr NULL
+#define slim_device_uevent NULL
+static void slim_dev_release(struct device *dev)
+{
+ struct slim_device *sbdev = to_slim_device(dev);
+
+ slim_ctrl_put(sbdev->ctrl);
+}
+
+static struct device_type slim_dev_type = {
+ .groups = slim_device_attr_gr,
+ .uevent = slim_device_uevent,
+ .release = slim_dev_release,
+};
+
+static void slim_report(struct work_struct *work)
+{
+ struct slim_driver *sbdrv;
+ struct slim_device *sbdev =
+ container_of(work, struct slim_device, wd);
+ if (!sbdev->dev.driver)
+ return;
+ /* check if device-up or down needs to be called */
+ if ((!sbdev->reported && !sbdev->notified) ||
+ (sbdev->reported && sbdev->notified))
+ return;
+
+ sbdrv = to_slim_driver(sbdev->dev.driver);
+ /*
+ * address no longer valid, means device reported absent, whereas
+ * address valid, means device reported present
+ */
+ if (sbdev->notified && !sbdev->reported) {
+ sbdev->notified = false;
+ if (sbdrv->device_down)
+ sbdrv->device_down(sbdev);
+ } else if (!sbdev->notified && sbdev->reported) {
+ sbdev->notified = true;
+ if (sbdrv->device_up)
+ sbdrv->device_up(sbdev);
+ }
+}
+
+/*
+ * slim_add_device: Add a new device without register board info.
+ * @ctrl: Controller to which this device is to be added to.
+ * Called when device doesn't have an explicit client-driver to be probed, or
+ * the client-driver is a module installed dynamically.
+ */
+int slim_add_device(struct slim_controller *ctrl, struct slim_device *sbdev)
+{
+ sbdev->dev.bus = &slimbus_type;
+ sbdev->dev.parent = ctrl->dev.parent;
+ sbdev->dev.type = &slim_dev_type;
+ sbdev->dev.driver = NULL;
+ sbdev->ctrl = ctrl;
+ slim_ctrl_get(ctrl);
+ dev_set_name(&sbdev->dev, "%s", sbdev->name);
+ mutex_init(&sbdev->sldev_reconf);
+ INIT_LIST_HEAD(&sbdev->mark_define);
+ INIT_LIST_HEAD(&sbdev->mark_suspend);
+ INIT_LIST_HEAD(&sbdev->mark_removal);
+ INIT_WORK(&sbdev->wd, slim_report);
+ mutex_lock(&ctrl->m_ctrl);
+ list_add_tail(&sbdev->dev_list, &ctrl->devs);
+ mutex_unlock(&ctrl->m_ctrl);
+ /* probe slave on this controller */
+ return device_register(&sbdev->dev);
+}
+EXPORT_SYMBOL(slim_add_device);
+
+struct sbi_boardinfo {
+ struct list_head list;
+ struct slim_boardinfo board_info;
+};
+
+static LIST_HEAD(board_list);
+static LIST_HEAD(slim_ctrl_list);
+static DEFINE_MUTEX(board_lock);
+
+/* If controller is not present, only add to boards list */
+static void slim_match_ctrl_to_boardinfo(struct slim_controller *ctrl,
+ struct slim_boardinfo *bi)
+{
+ int ret;
+
+ if (ctrl->nr != bi->bus_num)
+ return;
+
+ ret = slim_add_device(ctrl, bi->slim_slave);
+ if (ret != 0)
+ dev_err(ctrl->dev.parent, "can't create new device for %s\n",
+ bi->slim_slave->name);
+}
+
+/*
+ * slim_register_board_info: Board-initialization routine.
+ * @info: List of all devices on all controllers present on the board.
+ * @n: number of entries.
+ * API enumerates respective devices on corresponding controller.
+ * Called from board-init function.
+ */
+int slim_register_board_info(struct slim_boardinfo const *info, unsigned int n)
+{
+ struct sbi_boardinfo *bi;
+ int i;
+
+ bi = kcalloc(n, sizeof(*bi), GFP_KERNEL);
+ if (!bi)
+ return -ENOMEM;
+
+ for (i = 0; i < n; i++, bi++, info++) {
+ struct slim_controller *ctrl;
+
+ memcpy(&bi->board_info, info, sizeof(*info));
+ mutex_lock(&board_lock);
+ list_add_tail(&bi->list, &board_list);
+ list_for_each_entry(ctrl, &slim_ctrl_list, list)
+ slim_match_ctrl_to_boardinfo(ctrl, &bi->board_info);
+ mutex_unlock(&board_lock);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(slim_register_board_info);
+
+/*
+ * slim_ctrl_add_boarddevs: Add devices registered by board-info
+ * @ctrl: Controller to which these devices are to be added to.
+ * This API is called by controller when it is up and running.
+ * If devices on a controller were registered before controller,
+ * this will make sure that they get probed when controller is up.
+ */
+void slim_ctrl_add_boarddevs(struct slim_controller *ctrl)
+{
+ struct sbi_boardinfo *bi;
+
+ mutex_lock(&board_lock);
+ list_add_tail(&ctrl->list, &slim_ctrl_list);
+ list_for_each_entry(bi, &board_list, list)
+ slim_match_ctrl_to_boardinfo(ctrl, &bi->board_info);
+ mutex_unlock(&board_lock);
+}
+EXPORT_SYMBOL(slim_ctrl_add_boarddevs);
+
+/*
+ * slim_busnum_to_ctrl: Map bus number to controller
+ * @busnum: Bus number
+ * Returns controller representing this bus number
+ */
+struct slim_controller *slim_busnum_to_ctrl(u32 bus_num)
+{
+ struct slim_controller *ctrl;
+
+ mutex_lock(&board_lock);
+ list_for_each_entry(ctrl, &slim_ctrl_list, list)
+ if (bus_num == ctrl->nr) {
+ mutex_unlock(&board_lock);
+ return ctrl;
+ }
+ mutex_unlock(&board_lock);
+ return NULL;
+}
+EXPORT_SYMBOL(slim_busnum_to_ctrl);
+
+static int slim_register_controller(struct slim_controller *ctrl)
+{
+ int ret = 0;
+
+ /* Can't register until after driver model init */
+ if (WARN_ON(!slimbus_type.p)) {
+ ret = -EPROBE_DEFER;
+ goto out_list;
+ }
+
+ dev_set_name(&ctrl->dev, "sb-%d", ctrl->nr);
+ ctrl->dev.bus = &slimbus_type;
+ ctrl->dev.type = &slim_ctrl_type;
+ ctrl->num_dev = 0;
+ if (!ctrl->min_cg)
+ ctrl->min_cg = SLIM_MIN_CLK_GEAR;
+ if (!ctrl->max_cg)
+ ctrl->max_cg = SLIM_MAX_CLK_GEAR;
+ spin_lock_init(&ctrl->txn_lock);
+ mutex_init(&ctrl->m_ctrl);
+ mutex_init(&ctrl->sched.m_reconf);
+ ret = device_register(&ctrl->dev);
+ if (ret)
+ goto out_list;
+
+ dev_dbg(&ctrl->dev, "Bus [%s] registered:dev:%p\n", ctrl->name,
+ &ctrl->dev);
+
+ if (ctrl->nports) {
+ ctrl->ports = kcalloc(ctrl->nports, sizeof(struct slim_port),
+ GFP_KERNEL);
+ if (!ctrl->ports) {
+ ret = -ENOMEM;
+ goto err_port_failed;
+ }
+ }
+ if (ctrl->nchans) {
+ ctrl->chans = kcalloc(ctrl->nchans, sizeof(struct slim_ich),
+ GFP_KERNEL);
+ if (!ctrl->chans) {
+ ret = -ENOMEM;
+ goto err_chan_failed;
+ }
+
+ ctrl->sched.chc1 = kcalloc(ctrl->nchans,
+ sizeof(struct slim_ich *), GFP_KERNEL);
+ if (!ctrl->sched.chc1) {
+ kfree(ctrl->chans);
+ ret = -ENOMEM;
+ goto err_chan_failed;
+ }
+ ctrl->sched.chc3 = kcalloc(ctrl->nchans,
+ sizeof(struct slim_ich *), GFP_KERNEL);
+ if (!ctrl->sched.chc3) {
+ kfree(ctrl->sched.chc1);
+ kfree(ctrl->chans);
+ ret = -ENOMEM;
+ goto err_chan_failed;
+ }
+ }
+#ifdef DEBUG
+ ctrl->sched.slots = kzalloc(SLIM_SL_PER_SUPERFRAME, GFP_KERNEL);
+#endif
+ init_completion(&ctrl->pause_comp);
+
+ INIT_LIST_HEAD(&ctrl->devs);
+ ctrl->wq = create_singlethread_workqueue(dev_name(&ctrl->dev));
+ if (!ctrl->wq)
+ goto err_workq_failed;
+
+ return 0;
+
+err_workq_failed:
+ kfree(ctrl->sched.chc3);
+ kfree(ctrl->sched.chc1);
+ kfree(ctrl->chans);
+err_chan_failed:
+ kfree(ctrl->ports);
+err_port_failed:
+ device_unregister(&ctrl->dev);
+out_list:
+ mutex_lock(&slim_lock);
+ idr_remove(&ctrl_idr, ctrl->nr);
+ mutex_unlock(&slim_lock);
+ return ret;
+}
+
+/* slim_remove_device: Remove the effect of slim_add_device() */
+void slim_remove_device(struct slim_device *sbdev)
+{
+ struct slim_controller *ctrl = sbdev->ctrl;
+
+ mutex_lock(&ctrl->m_ctrl);
+ list_del_init(&sbdev->dev_list);
+ mutex_unlock(&ctrl->m_ctrl);
+ device_unregister(&sbdev->dev);
+}
+EXPORT_SYMBOL(slim_remove_device);
+
+static void slim_ctrl_remove_device(struct slim_controller *ctrl,
+ struct slim_boardinfo *bi)
+{
+ if (ctrl->nr == bi->bus_num)
+ slim_remove_device(bi->slim_slave);
+}
+
+/*
+ * slim_del_controller: Controller tear-down.
+ * Controller added with the above API is teared down using this API.
+ */
+int slim_del_controller(struct slim_controller *ctrl)
+{
+ struct slim_controller *found;
+ struct sbi_boardinfo *bi;
+
+ /* First make sure that this bus was added */
+ mutex_lock(&slim_lock);
+ found = idr_find(&ctrl_idr, ctrl->nr);
+ mutex_unlock(&slim_lock);
+ if (found != ctrl)
+ return -EINVAL;
+
+ /* Remove all clients */
+ mutex_lock(&board_lock);
+ list_for_each_entry(bi, &board_list, list)
+ slim_ctrl_remove_device(ctrl, &bi->board_info);
+ mutex_unlock(&board_lock);
+
+ init_completion(&ctrl->dev_released);
+ device_unregister(&ctrl->dev);
+
+ wait_for_completion(&ctrl->dev_released);
+ list_del(&ctrl->list);
+ destroy_workqueue(ctrl->wq);
+ /* free bus id */
+ mutex_lock(&slim_lock);
+ idr_remove(&ctrl_idr, ctrl->nr);
+ mutex_unlock(&slim_lock);
+
+ kfree(ctrl->sched.chc1);
+ kfree(ctrl->sched.chc3);
+#ifdef DEBUG
+ kfree(ctrl->sched.slots);
+#endif
+ kfree(ctrl->chans);
+ kfree(ctrl->ports);
+
+ return 0;
+}
+EXPORT_SYMBOL(slim_del_controller);
+
+/*
+ * slim_add_numbered_controller: Controller bring-up.
+ * @ctrl: Controller to be registered.
+ * A controller is registered with the framework using this API. ctrl->nr is the
+ * desired number with which slimbus framework registers the controller.
+ * Function will return -EBUSY if the number is in use.
+ */
+int slim_add_numbered_controller(struct slim_controller *ctrl)
+{
+ int id;
+
+ mutex_lock(&slim_lock);
+ id = idr_alloc(&ctrl_idr, ctrl, ctrl->nr, ctrl->nr + 1, GFP_KERNEL);
+ mutex_unlock(&slim_lock);
+
+ if (id < 0)
+ return id;
+
+ ctrl->nr = id;
+ return slim_register_controller(ctrl);
+}
+EXPORT_SYMBOL(slim_add_numbered_controller);
+
+/*
+ * slim_report_absent: Controller calls this function when a device
+ * reports absent, OR when the device cannot be communicated with
+ * @sbdev: Device that cannot be reached, or sent report absent
+ */
+void slim_report_absent(struct slim_device *sbdev)
+{
+ struct slim_controller *ctrl;
+ int i;
+
+ if (!sbdev)
+ return;
+ ctrl = sbdev->ctrl;
+ if (!ctrl)
+ return;
+ /* invalidate logical addresses */
+ mutex_lock(&ctrl->m_ctrl);
+ for (i = 0; i < ctrl->num_dev; i++) {
+ if (sbdev->laddr == ctrl->addrt[i].laddr)
+ ctrl->addrt[i].valid = false;
+ }
+ mutex_unlock(&ctrl->m_ctrl);
+ sbdev->reported = false;
+ queue_work(ctrl->wq, &sbdev->wd);
+}
+EXPORT_SYMBOL(slim_report_absent);
+
+static int slim_remove_ch(struct slim_controller *ctrl, struct slim_ich *slc);
+/*
+ * slim_framer_booted: This function is called by controller after the active
+ * framer has booted (using Bus Reset sequence, or after it has shutdown and has
+ * come back up). Components, devices on the bus may be in undefined state,
+ * and this function triggers their drivers to do the needful
+ * to bring them back in Reset state so that they can acquire sync, report
+ * present and be operational again.
+ */
+void slim_framer_booted(struct slim_controller *ctrl)
+{
+ struct slim_device *sbdev;
+ struct list_head *pos, *next;
+ int i;
+
+ if (!ctrl)
+ return;
+
+ /* Since framer has rebooted, reset all data channels */
+ mutex_lock(&ctrl->sched.m_reconf);
+ for (i = 0; i < ctrl->nchans; i++) {
+ struct slim_ich *slc = &ctrl->chans[i];
+
+ if (slc->state > SLIM_CH_DEFINED)
+ slim_remove_ch(ctrl, slc);
+ }
+ mutex_unlock(&ctrl->sched.m_reconf);
+ mutex_lock(&ctrl->m_ctrl);
+ list_for_each_safe(pos, next, &ctrl->devs) {
+ struct slim_driver *sbdrv;
+
+ sbdev = list_entry(pos, struct slim_device, dev_list);
+ mutex_unlock(&ctrl->m_ctrl);
+ if (sbdev && sbdev->dev.driver) {
+ sbdrv = to_slim_driver(sbdev->dev.driver);
+ if (sbdrv->reset_device)
+ sbdrv->reset_device(sbdev);
+ }
+ mutex_lock(&ctrl->m_ctrl);
+ }
+ mutex_unlock(&ctrl->m_ctrl);
+}
+EXPORT_SYMBOL(slim_framer_booted);
+
+/*
+ * slim_msg_response: Deliver Message response received from a device to the
+ * framework.
+ * @ctrl: Controller handle
+ * @reply: Reply received from the device
+ * @len: Length of the reply
+ * @tid: Transaction ID received with which framework can associate reply.
+ * Called by controller to inform framework about the response received.
+ * This helps in making the API asynchronous, and controller-driver doesn't need
+ * to manage 1 more table other than the one managed by framework mapping TID
+ * with buffers
+ */
+void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 len)
+{
+ int i;
+ unsigned long flags;
+ bool async;
+ struct slim_msg_txn *txn;
+
+ spin_lock_irqsave(&ctrl->txn_lock, flags);
+ txn = ctrl->txnt[tid];
+ if (txn == NULL || txn->rbuf == NULL) {
+ spin_unlock_irqrestore(&ctrl->txn_lock, flags);
+ if (txn == NULL)
+ dev_err(&ctrl->dev, "Got response to invalid TID:%d, len:%d",
+ tid, len);
+ else
+ dev_err(&ctrl->dev, "Invalid client buffer passed\n");
+ return;
+ }
+ async = txn->async;
+ for (i = 0; i < len; i++)
+ txn->rbuf[i] = reply[i];
+ if (txn->comp)
+ complete(txn->comp);
+ ctrl->txnt[tid] = NULL;
+ spin_unlock_irqrestore(&ctrl->txn_lock, flags);
+ if (async)
+ kfree(txn);
+}
+EXPORT_SYMBOL(slim_msg_response);
+
+static int slim_processtxn(struct slim_controller *ctrl,
+ struct slim_msg_txn *txn, bool need_tid)
+{
+ u8 i = 0;
+ int ret = 0;
+ unsigned long flags;
+
+ if (need_tid) {
+ spin_lock_irqsave(&ctrl->txn_lock, flags);
+ for (i = 0; i < ctrl->last_tid; i++) {
+ if (ctrl->txnt[i] == NULL)
+ break;
+ }
+ if (i >= ctrl->last_tid) {
+ if (ctrl->last_tid == 255) {
+ spin_unlock_irqrestore(&ctrl->txn_lock, flags);
+ return -ENOMEM;
+ }
+ ctrl->last_tid++;
+ }
+ ctrl->txnt[i] = txn;
+ txn->tid = i;
+ spin_unlock_irqrestore(&ctrl->txn_lock, flags);
+ }
+
+ ret = ctrl->xfer_msg(ctrl, txn);
+ return ret;
+}
+
+static int ctrl_getlogical_addr(struct slim_controller *ctrl, const u8 *eaddr,
+ u8 e_len, u8 *entry)
+{
+ u8 i;
+
+ for (i = 0; i < ctrl->num_dev; i++) {
+ if (ctrl->addrt[i].valid &&
+ memcmp(ctrl->addrt[i].eaddr, eaddr, e_len) == 0) {
+ *entry = i;
+ return 0;
+ }
+ }
+ return -ENXIO;
+}
+
+/*
+ * slim_assign_laddr: Assign logical address to a device enumerated.
+ * @ctrl: Controller with which device is enumerated.
+ * @e_addr: 6-byte elemental address of the device.
+ * @e_len: buffer length for e_addr
+ * @laddr: Return logical address (if valid flag is false)
+ * @valid: true if laddr holds a valid address that controller wants to
+ * set for this enumeration address. Otherwise framework sets index into
+ * address table as logical address.
+ * Called by controller in response to REPORT_PRESENT. Framework will assign
+ * a logical address to this enumeration address.
+ * Function returns -EXFULL to indicate that all logical addresses are already
+ * taken.
+ */
+int slim_assign_laddr(struct slim_controller *ctrl, const u8 *e_addr,
+ u8 e_len, u8 *laddr, bool valid)
+{
+ int ret;
+ u8 i = 0;
+ bool exists = false;
+ struct slim_device *sbdev;
+ struct list_head *pos, *next;
+ void *new_addrt = NULL;
+
+ mutex_lock(&ctrl->m_ctrl);
+ /* already assigned */
+ if (ctrl_getlogical_addr(ctrl, e_addr, e_len, &i) == 0) {
+ *laddr = ctrl->addrt[i].laddr;
+ exists = true;
+ } else {
+ if (ctrl->num_dev >= 254) {
+ ret = -EXFULL;
+ goto ret_assigned_laddr;
+ }
+ for (i = 0; i < ctrl->num_dev; i++) {
+ if (ctrl->addrt[i].valid == false)
+ break;
+ }
+ if (i == ctrl->num_dev) {
+ new_addrt = krealloc(ctrl->addrt,
+ (ctrl->num_dev + 1) *
+ sizeof(struct slim_addrt),
+ GFP_KERNEL);
+ if (!new_addrt) {
+ ret = -ENOMEM;
+ goto ret_assigned_laddr;
+ }
+ ctrl->addrt = new_addrt;
+ ctrl->num_dev++;
+ }
+ memcpy(ctrl->addrt[i].eaddr, e_addr, e_len);
+ ctrl->addrt[i].valid = true;
+ /* Preferred address is index into table */
+ if (!valid)
+ *laddr = i;
+ }
+
+ ret = ctrl->set_laddr(ctrl, (const u8 *)&ctrl->addrt[i].eaddr, 6,
+ *laddr);
+ if (ret) {
+ ctrl->addrt[i].valid = false;
+ goto ret_assigned_laddr;
+ }
+ ctrl->addrt[i].laddr = *laddr;
+
+ dev_dbg(&ctrl->dev, "setting slimbus l-addr:%x\n", *laddr);
+ret_assigned_laddr:
+ mutex_unlock(&ctrl->m_ctrl);
+ if (exists || ret)
+ return ret;
+
+ pr_info("slimbus:%d laddr:0x%x, EAPC:0x%x:0x%x", ctrl->nr, *laddr,
+ e_addr[1], e_addr[2]);
+ mutex_lock(&ctrl->m_ctrl);
+ list_for_each_safe(pos, next, &ctrl->devs) {
+ sbdev = list_entry(pos, struct slim_device, dev_list);
+ if (memcmp(sbdev->e_addr, e_addr, 6) == 0) {
+ struct slim_driver *sbdrv;
+
+ sbdev->laddr = *laddr;
+ sbdev->reported = true;
+ if (sbdev->dev.driver) {
+ sbdrv = to_slim_driver(sbdev->dev.driver);
+ if (sbdrv->device_up)
+ queue_work(ctrl->wq, &sbdev->wd);
+ }
+ break;
+ }
+ }
+ mutex_unlock(&ctrl->m_ctrl);
+ return 0;
+}
+EXPORT_SYMBOL(slim_assign_laddr);
+
+/*
+ * slim_get_logical_addr: Return the logical address of a slimbus device.
+ * @sb: client handle requesting the adddress.
+ * @e_addr: Elemental address of the device.
+ * @e_len: Length of e_addr
+ * @laddr: output buffer to store the address
+ * context: can sleep
+ * -EINVAL is returned in case of invalid parameters, and -ENXIO is returned if
+ * the device with this elemental address is not found.
+ */
+int slim_get_logical_addr(struct slim_device *sb, const u8 *e_addr,
+ u8 e_len, u8 *laddr)
+{
+ int ret = 0;
+ u8 entry;
+ struct slim_controller *ctrl = sb->ctrl;
+
+ if (!ctrl || !laddr || !e_addr || e_len != 6)
+ return -EINVAL;
+ mutex_lock(&ctrl->m_ctrl);
+ ret = ctrl_getlogical_addr(ctrl, e_addr, e_len, &entry);
+ if (!ret)
+ *laddr = ctrl->addrt[entry].laddr;
+ mutex_unlock(&ctrl->m_ctrl);
+ if (ret == -ENXIO && ctrl->get_laddr) {
+ ret = ctrl->get_laddr(ctrl, e_addr, e_len, laddr);
+ if (!ret)
+ ret = slim_assign_laddr(ctrl, e_addr, e_len, laddr,
+ true);
+ }
+ return ret;
+}
+EXPORT_SYMBOL(slim_get_logical_addr);
+
+static int slim_ele_access_sanity(struct slim_ele_access *msg, int oper,
+ u8 *rbuf, const u8 *wbuf, u8 len)
+{
+ if (!msg || msg->num_bytes > 16 || msg->start_offset + len > 0xC00)
+ return -EINVAL;
+ switch (oper) {
+ case SLIM_MSG_MC_REQUEST_VALUE:
+ case SLIM_MSG_MC_REQUEST_INFORMATION:
+ if (rbuf == NULL)
+ return -EINVAL;
+ return 0;
+ case SLIM_MSG_MC_CHANGE_VALUE:
+ case SLIM_MSG_MC_CLEAR_INFORMATION:
+ if (wbuf == NULL)
+ return -EINVAL;
+ return 0;
+ case SLIM_MSG_MC_REQUEST_CHANGE_VALUE:
+ case SLIM_MSG_MC_REQUEST_CLEAR_INFORMATION:
+ if (rbuf == NULL || wbuf == NULL)
+ return -EINVAL;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static u16 slim_slicecodefromsize(u32 req)
+{
+ u8 codetosize[8] = {1, 2, 3, 4, 6, 8, 12, 16};
+
+ if (req >= 8)
+ return 0;
+ else
+ return codetosize[req];
+}
+
+static u16 slim_slicesize(u32 code)
+{
+ u8 sizetocode[16] = {0, 1, 2, 3, 3, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7};
+
+ if (code == 0)
+ code = 1;
+ if (code > 16)
+ code = 16;
+ return sizetocode[code - 1];
+}
+
+
+/* Message APIs Unicast message APIs used by slimbus slave drivers */
+
+/*
+ * Message API access routines.
+ * @sb: client handle requesting elemental message reads, writes.
+ * @msg: Input structure for start-offset, number of bytes to read.
+ * @rbuf: data buffer to be filled with values read.
+ * @len: data buffer size
+ * @wbuf: data buffer containing value/information to be written
+ * context: can sleep
+ * Returns:
+ * -EINVAL: Invalid parameters
+ * -ETIMEDOUT: If controller could not complete the request. This may happen if
+ * the bus lines are not clocked, controller is not powered-on, slave with
+ * given address is not enumerated/responding.
+ */
+int slim_request_val_element(struct slim_device *sb,
+ struct slim_ele_access *msg, u8 *buf, u8 len)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+
+ if (!ctrl)
+ return -EINVAL;
+ return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_REQUEST_VALUE, buf,
+ NULL, len);
+}
+EXPORT_SYMBOL(slim_request_val_element);
+
+int slim_request_inf_element(struct slim_device *sb,
+ struct slim_ele_access *msg, u8 *buf, u8 len)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+
+ if (!ctrl)
+ return -EINVAL;
+ return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_REQUEST_INFORMATION,
+ buf, NULL, len);
+}
+EXPORT_SYMBOL(slim_request_inf_element);
+
+int slim_change_val_element(struct slim_device *sb, struct slim_ele_access *msg,
+ const u8 *buf, u8 len)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+
+ if (!ctrl)
+ return -EINVAL;
+ return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_CHANGE_VALUE, NULL, buf,
+ len);
+}
+EXPORT_SYMBOL(slim_change_val_element);
+
+int slim_clear_inf_element(struct slim_device *sb, struct slim_ele_access *msg,
+ u8 *buf, u8 len)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+
+ if (!ctrl)
+ return -EINVAL;
+ return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_CLEAR_INFORMATION, NULL,
+ buf, len);
+}
+EXPORT_SYMBOL(slim_clear_inf_element);
+
+int slim_request_change_val_element(struct slim_device *sb,
+ struct slim_ele_access *msg, u8 *rbuf,
+ const u8 *wbuf, u8 len)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+
+ if (!ctrl)
+ return -EINVAL;
+ return slim_xfer_msg(ctrl, sb, msg, SLIM_MSG_MC_REQUEST_CHANGE_VALUE,
+ rbuf, wbuf, len);
+}
+EXPORT_SYMBOL(slim_request_change_val_element);
+
+int slim_request_clear_inf_element(struct slim_device *sb,
+ struct slim_ele_access *msg, u8 *rbuf,
+ const u8 *wbuf, u8 len)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+
+ if (!ctrl)
+ return -EINVAL;
+ return slim_xfer_msg(ctrl, sb, msg,
+ SLIM_MSG_MC_REQUEST_CLEAR_INFORMATION,
+ rbuf, wbuf, len);
+}
+EXPORT_SYMBOL(slim_request_clear_inf_element);
+
+/*
+ * Broadcast message API:
+ * call this API directly with sbdev = NULL.
+ * For broadcast reads, make sure that buffers are big-enough to incorporate
+ * replies from all logical addresses.
+ * All controllers may not support broadcast
+ */
+int slim_xfer_msg(struct slim_controller *ctrl, struct slim_device *sbdev,
+ struct slim_ele_access *msg, u16 mc, u8 *rbuf,
+ const u8 *wbuf, u8 len)
+{
+ DECLARE_COMPLETION_ONSTACK(complete);
+ DEFINE_SLIM_LDEST_TXN(txn_stack, mc, len, 6, rbuf, wbuf, sbdev->laddr);
+ struct slim_msg_txn *txn;
+ int ret;
+ u16 sl, cur;
+
+ if (msg->comp && rbuf) {
+ txn = kmalloc(sizeof(struct slim_msg_txn),
+ GFP_KERNEL);
+ if (IS_ERR_OR_NULL(txn))
+ return PTR_ERR(txn);
+ *txn = txn_stack;
+ txn->async = true;
+ txn->comp = msg->comp;
+ } else {
+ txn = &txn_stack;
+ if (rbuf)
+ txn->comp = &complete;
+ }
+
+ ret = slim_ele_access_sanity(msg, mc, rbuf, wbuf, len);
+ if (ret)
+ goto xfer_err;
+
+ sl = slim_slicesize(len);
+ dev_dbg(&ctrl->dev, "SB xfer msg:os:%x, len:%d, MC:%x, sl:%x\n",
+ msg->start_offset, len, mc, sl);
+
+ cur = slim_slicecodefromsize(sl);
+ txn->ec = ((sl | (1 << 3)) | ((msg->start_offset & 0xFFF) << 4));
+
+ if (wbuf)
+ txn->rl += len;
+ if (rbuf) {
+ unsigned long flags;
+
+ txn->rl++;
+ ret = slim_processtxn(ctrl, txn, true);
+
+ /* sync read */
+ if (!ret && !msg->comp) {
+ ret = wait_for_completion_timeout(&complete, HZ);
+ if (!ret) {
+ dev_err(&ctrl->dev, "slimbus Read timed out");
+ spin_lock_irqsave(&ctrl->txn_lock, flags);
+ /* Invalidate the transaction */
+ ctrl->txnt[txn->tid] = NULL;
+ spin_unlock_irqrestore(&ctrl->txn_lock, flags);
+ ret = -ETIMEDOUT;
+ } else
+ ret = 0;
+ } else if (ret < 0 && !msg->comp) {
+ dev_err(&ctrl->dev, "slimbus Read error");
+ spin_lock_irqsave(&ctrl->txn_lock, flags);
+ /* Invalidate the transaction */
+ ctrl->txnt[txn->tid] = NULL;
+ spin_unlock_irqrestore(&ctrl->txn_lock, flags);
+ }
+
+ } else
+ ret = slim_processtxn(ctrl, txn, false);
+xfer_err:
+ return ret;
+}
+EXPORT_SYMBOL(slim_xfer_msg);
+
+/*
+ * User message:
+ * slim_user_msg: Send user message that is interpreted by destination device
+ * @sb: Client handle sending the message
+ * @la: Destination device for this user message
+ * @mt: Message Type (Soruce-referred, or Destination-referred)
+ * @mc: Message Code
+ * @msg: Message structure (start offset, number of bytes) to be sent
+ * @buf: data buffer to be sent
+ * @len: data buffer size in bytes
+ */
+int slim_user_msg(struct slim_device *sb, u8 la, u8 mt, u8 mc,
+ struct slim_ele_access *msg, u8 *buf, u8 len)
+{
+ if (!sb || !sb->ctrl || !msg || mt == SLIM_MSG_MT_CORE)
+ return -EINVAL;
+ if (!sb->ctrl->xfer_user_msg)
+ return -EPROTONOSUPPORT;
+ return sb->ctrl->xfer_user_msg(sb->ctrl, la, mt, mc, msg, buf, len);
+}
+EXPORT_SYMBOL(slim_user_msg);
+
+/*
+ * Queue bulk of message writes:
+ * slim_bulk_msg_write: Write bulk of messages (e.g. downloading FW)
+ * @sb: Client handle sending these messages
+ * @la: Destination device for these messages
+ * @mt: Message Type
+ * @mc: Message Code
+ * @msgs: List of messages to be written in bulk
+ * @n: Number of messages in the list
+ * @cb: Callback if client needs this to be non-blocking
+ * @ctx: Context for this callback
+ * If supported by controller, this message list will be sent in bulk to the HW
+ * If the client specifies this to be non-blocking, the callback will be
+ * called from atomic context.
+ */
+int slim_bulk_msg_write(struct slim_device *sb, u8 mt, u8 mc,
+ struct slim_val_inf msgs[], int n,
+ int (*comp_cb)(void *ctx, int err), void *ctx)
+{
+ int i, ret;
+
+ if (!sb || !sb->ctrl || !msgs)
+ return -EINVAL;
+ if (!sb->ctrl->xfer_bulk_wr) {
+ pr_warn("controller does not support bulk WR, serializing");
+ for (i = 0; i < n; i++) {
+ struct slim_ele_access ele;
+
+ ele.comp = NULL;
+ ele.start_offset = msgs[i].start_offset;
+ ele.num_bytes = msgs[i].num_bytes;
+ ret = slim_xfer_msg(sb->ctrl, sb, &ele, mc,
+ msgs[i].rbuf, msgs[i].wbuf,
+ ele.num_bytes);
+ if (ret)
+ return ret;
+ }
+ return ret;
+ }
+ return sb->ctrl->xfer_bulk_wr(sb->ctrl, sb->laddr, mt, mc, msgs, n,
+ comp_cb, ctx);
+}
+EXPORT_SYMBOL(slim_bulk_msg_write);
+
+/*
+ * slim_alloc_mgrports: Allocate port on manager side.
+ * @sb: device/client handle.
+ * @req: Port request type.
+ * @nports: Number of ports requested
+ * @rh: output buffer to store the port handles
+ * @hsz: size of buffer storing handles
+ * context: can sleep
+ * This port will be typically used by SW. e.g. client driver wants to receive
+ * some data from audio codec HW using a data channel.
+ * Port allocated using this API will be used to receive the data.
+ * If half-duplex ports are requested, two adjacent ports are allocated for
+ * 1 half-duplex port. So the handle-buffer size should be twice the number
+ * of half-duplex ports to be allocated.
+ * -EDQUOT is returned if all ports are in use.
+ */
+int slim_alloc_mgrports(struct slim_device *sb, enum slim_port_req req,
+ int nports, u32 *rh, int hsz)
+{
+ int i, j;
+ int ret = -EINVAL;
+ int nphysp = nports;
+ struct slim_controller *ctrl = sb->ctrl;
+
+ if (!rh || !ctrl)
+ return -EINVAL;
+ if (req == SLIM_REQ_HALF_DUP)
+ nphysp *= 2;
+ if (hsz/sizeof(u32) < nphysp)
+ return -EINVAL;
+ mutex_lock(&ctrl->m_ctrl);
+
+ for (i = 0; i < ctrl->nports; i++) {
+ bool multiok = true;
+
+ if (ctrl->ports[i].state != SLIM_P_FREE)
+ continue;
+ /* Start half duplex channel at even port */
+ if (req == SLIM_REQ_HALF_DUP && (i % 2))
+ continue;
+ /* Allocate ports contiguously for multi-ch */
+ if (ctrl->nports < (i + nphysp)) {
+ i = ctrl->nports;
+ break;
+ }
+ if (req == SLIM_REQ_MULTI_CH) {
+ multiok = true;
+ for (j = i; j < i + nphysp; j++) {
+ if (ctrl->ports[j].state != SLIM_P_FREE) {
+ multiok = false;
+ break;
+ }
+ }
+ if (!multiok)
+ continue;
+ }
+ break;
+ }
+ if (i >= ctrl->nports) {
+ ret = -EDQUOT;
+ goto alloc_err;
+ }
+ ret = 0;
+ for (j = i; j < i + nphysp; j++) {
+ ctrl->ports[j].state = SLIM_P_UNCFG;
+ ctrl->ports[j].req = req;
+ if (req == SLIM_REQ_HALF_DUP && (j % 2))
+ ctrl->ports[j].flow = SLIM_SINK;
+ else
+ ctrl->ports[j].flow = SLIM_SRC;
+ if (ctrl->alloc_port)
+ ret = ctrl->alloc_port(ctrl, j);
+ if (ret) {
+ for (; j >= i; j--)
+ ctrl->ports[j].state = SLIM_P_FREE;
+ goto alloc_err;
+ }
+ *rh++ = SLIM_PORT_HDL(SLIM_LA_MANAGER, 0, j);
+ }
+alloc_err:
+ mutex_unlock(&ctrl->m_ctrl);
+ return ret;
+}
+EXPORT_SYMBOL(slim_alloc_mgrports);
+
+/* Deallocate the port(s) allocated using the API above */
+int slim_dealloc_mgrports(struct slim_device *sb, u32 *hdl, int nports)
+{
+ int i;
+ struct slim_controller *ctrl = sb->ctrl;
+
+ if (!ctrl || !hdl)
+ return -EINVAL;
+
+ mutex_lock(&ctrl->m_ctrl);
+
+ for (i = 0; i < nports; i++) {
+ u8 pn;
+
+ pn = SLIM_HDL_TO_PORT(hdl[i]);
+
+ if (pn >= ctrl->nports || ctrl->ports[pn].state == SLIM_P_CFG) {
+ int j, ret;
+
+ if (pn >= ctrl->nports) {
+ dev_err(&ctrl->dev, "invalid port number");
+ ret = -EINVAL;
+ } else {
+ dev_err(&ctrl->dev,
+ "Can't dealloc connected port:%d", i);
+ ret = -EISCONN;
+ }
+ for (j = i - 1; j >= 0; j--) {
+ pn = SLIM_HDL_TO_PORT(hdl[j]);
+ ctrl->ports[pn].state = SLIM_P_UNCFG;
+ }
+ mutex_unlock(&ctrl->m_ctrl);
+ return ret;
+ }
+ if (ctrl->dealloc_port)
+ ctrl->dealloc_port(ctrl, pn);
+ ctrl->ports[pn].state = SLIM_P_FREE;
+ }
+ mutex_unlock(&ctrl->m_ctrl);
+ return 0;
+}
+EXPORT_SYMBOL(slim_dealloc_mgrports);
+
+/*
+ * slim_config_mgrports: Configure manager side ports
+ * @sb: device/client handle.
+ * @ph: array of port handles for which this configuration is valid
+ * @nports: Number of ports in ph
+ * @cfg: configuration requested for port(s)
+ * Configure port settings if they are different than the default ones.
+ * Returns success if the config could be applied. Returns -EISCONN if the
+ * port is in use
+ */
+int slim_config_mgrports(struct slim_device *sb, u32 *ph, int nports,
+ struct slim_port_cfg *cfg)
+{
+ int i;
+ struct slim_controller *ctrl;
+
+ if (!sb || !ph || !nports || !sb->ctrl || !cfg)
+ return -EINVAL;
+
+ ctrl = sb->ctrl;
+ mutex_lock(&ctrl->sched.m_reconf);
+ for (i = 0; i < nports; i++) {
+ u8 pn = SLIM_HDL_TO_PORT(ph[i]);
+
+ if (ctrl->ports[pn].state == SLIM_P_CFG)
+ return -EISCONN;
+ ctrl->ports[pn].cfg = *cfg;
+ }
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return 0;
+}
+EXPORT_SYMBOL(slim_config_mgrports);
+
+/*
+ * slim_get_slaveport: Get slave port handle
+ * @la: slave device logical address.
+ * @idx: port index at slave
+ * @rh: return handle
+ * @flw: Flow type (source or destination)
+ * This API only returns a slave port's representation as expected by slimbus
+ * driver. This port is not managed by the slimbus driver. Caller is expected
+ * to have visibility of this port since it's a device-port.
+ */
+int slim_get_slaveport(u8 la, int idx, u32 *rh, enum slim_port_flow flw)
+{
+ if (rh == NULL)
+ return -EINVAL;
+ *rh = SLIM_PORT_HDL(la, flw, idx);
+ return 0;
+}
+EXPORT_SYMBOL(slim_get_slaveport);
+
+static int connect_port_ch(struct slim_controller *ctrl, u8 ch, u32 ph,
+ enum slim_port_flow flow)
+{
+ int ret;
+ u8 buf[2];
+ u32 la = SLIM_HDL_TO_LA(ph);
+ u8 pn = (u8)SLIM_HDL_TO_PORT(ph);
+ DEFINE_SLIM_LDEST_TXN(txn, 0, 2, 6, NULL, buf, la);
+
+ if (flow == SLIM_SRC)
+ txn.mc = SLIM_MSG_MC_CONNECT_SOURCE;
+ else
+ txn.mc = SLIM_MSG_MC_CONNECT_SINK;
+ buf[0] = pn;
+ buf[1] = ctrl->chans[ch].chan;
+ if (la == SLIM_LA_MANAGER)
+ ctrl->ports[pn].flow = flow;
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (!ret && la == SLIM_LA_MANAGER)
+ ctrl->ports[pn].state = SLIM_P_CFG;
+ return ret;
+}
+
+static int disconnect_port_ch(struct slim_controller *ctrl, u32 ph)
+{
+ int ret;
+ u32 la = SLIM_HDL_TO_LA(ph);
+ u8 pn = (u8)SLIM_HDL_TO_PORT(ph);
+ DEFINE_SLIM_LDEST_TXN(txn, 0, 1, 5, NULL, &pn, la);
+
+ txn.mc = SLIM_MSG_MC_DISCONNECT_PORT;
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ return ret;
+ if (la == SLIM_LA_MANAGER) {
+ ctrl->ports[pn].state = SLIM_P_UNCFG;
+ ctrl->ports[pn].cfg.watermark = 0;
+ ctrl->ports[pn].cfg.port_opts = 0;
+ ctrl->ports[pn].ch = NULL;
+ }
+ return 0;
+}
+
+/*
+ * slim_connect_src: Connect source port to channel.
+ * @sb: client handle
+ * @srch: source handle to be connected to this channel
+ * @chanh: Channel with which the ports need to be associated with.
+ * Per slimbus specification, a channel may have 1 source port.
+ * Channel specified in chanh needs to be allocated first.
+ * Returns -EALREADY if source is already configured for this channel.
+ * Returns -ENOTCONN if channel is not allocated
+ * Returns -EINVAL if invalid direction is specified for non-manager port,
+ * or if the manager side port number is out of bounds, or in incorrect state
+ */
+int slim_connect_src(struct slim_device *sb, u32 srch, u16 chanh)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ int ret;
+ u8 chan = SLIM_HDL_TO_CHIDX(chanh);
+ struct slim_ich *slc = &ctrl->chans[chan];
+ enum slim_port_flow flow = SLIM_HDL_TO_FLOW(srch);
+ u8 la = SLIM_HDL_TO_LA(srch);
+ u8 pn = SLIM_HDL_TO_PORT(srch);
+
+ /* manager ports don't have direction when they are allocated */
+ if (la != SLIM_LA_MANAGER && flow != SLIM_SRC)
+ return -EINVAL;
+
+ mutex_lock(&ctrl->sched.m_reconf);
+
+ if (la == SLIM_LA_MANAGER) {
+ if (pn >= ctrl->nports ||
+ ctrl->ports[pn].state != SLIM_P_UNCFG) {
+ ret = -EINVAL;
+ goto connect_src_err;
+ }
+ }
+
+ if (slc->state == SLIM_CH_FREE) {
+ ret = -ENOTCONN;
+ goto connect_src_err;
+ }
+ /*
+ * Once channel is removed, its ports can be considered disconnected
+ * So its ports can be reassigned. Source port is zeroed
+ * when channel is deallocated.
+ */
+ if (slc->srch) {
+ ret = -EALREADY;
+ goto connect_src_err;
+ }
+ ctrl->ports[pn].ch = &slc->prop;
+ ret = connect_port_ch(ctrl, chan, srch, SLIM_SRC);
+
+ if (!ret)
+ slc->srch = srch;
+
+connect_src_err:
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return ret;
+}
+EXPORT_SYMBOL(slim_connect_src);
+
+/*
+ * slim_connect_sink: Connect sink port(s) to channel.
+ * @sb: client handle
+ * @sinkh: sink handle(s) to be connected to this channel
+ * @nsink: number of sinks
+ * @chanh: Channel with which the ports need to be associated with.
+ * Per slimbus specification, a channel may have multiple sink-ports.
+ * Channel specified in chanh needs to be allocated first.
+ * Returns -EALREADY if sink is already configured for this channel.
+ * Returns -ENOTCONN if channel is not allocated
+ * Returns -EINVAL if invalid parameters are passed, or invalid direction is
+ * specified for non-manager port, or if the manager side port number is out of
+ * bounds, or in incorrect state
+ */
+int slim_connect_sink(struct slim_device *sb, u32 *sinkh, int nsink, u16 chanh)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ int j;
+ int ret = 0;
+ u8 chan = SLIM_HDL_TO_CHIDX(chanh);
+ struct slim_ich *slc = &ctrl->chans[chan];
+ void *new_sinkh = NULL;
+
+ if (!sinkh || !nsink)
+ return -EINVAL;
+
+ mutex_lock(&ctrl->sched.m_reconf);
+
+ /*
+ * Once channel is removed, its ports can be considered disconnected
+ * So its ports can be reassigned. Sink ports are freed when channel
+ * is deallocated.
+ */
+ if (slc->state == SLIM_CH_FREE) {
+ ret = -ENOTCONN;
+ goto connect_sink_err;
+ }
+
+ for (j = 0; j < nsink; j++) {
+ enum slim_port_flow flow = SLIM_HDL_TO_FLOW(sinkh[j]);
+ u8 la = SLIM_HDL_TO_LA(sinkh[j]);
+ u8 pn = SLIM_HDL_TO_PORT(sinkh[j]);
+
+ if (la != SLIM_LA_MANAGER && flow != SLIM_SINK) {
+ ret = -EINVAL;
+ } else if (la == SLIM_LA_MANAGER &&
+ (pn >= ctrl->nports ||
+ ctrl->ports[pn].state != SLIM_P_UNCFG)) {
+ ret = -EINVAL;
+ } else {
+ ctrl->ports[pn].ch = &slc->prop;
+ ret = connect_port_ch(ctrl, chan, sinkh[j], SLIM_SINK);
+ }
+ if (ret) {
+ for (j = j - 1; j >= 0; j--)
+ disconnect_port_ch(ctrl, sinkh[j]);
+ goto connect_sink_err;
+ }
+ }
+
+ new_sinkh = krealloc(slc->sinkh, (sizeof(u32) * (slc->nsink + nsink)),
+ GFP_KERNEL);
+ if (!new_sinkh) {
+ ret = -ENOMEM;
+ for (j = 0; j < nsink; j++)
+ disconnect_port_ch(ctrl, sinkh[j]);
+ goto connect_sink_err;
+ }
+
+ slc->sinkh = new_sinkh;
+ memcpy(slc->sinkh + slc->nsink, sinkh, (sizeof(u32) * nsink));
+ slc->nsink += nsink;
+
+connect_sink_err:
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return ret;
+}
+EXPORT_SYMBOL(slim_connect_sink);
+
+/*
+ * slim_disconnect_ports: Disconnect port(s) from channel
+ * @sb: client handle
+ * @ph: ports to be disconnected
+ * @nph: number of ports.
+ * Disconnects ports from a channel.
+ */
+int slim_disconnect_ports(struct slim_device *sb, u32 *ph, int nph)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ int i;
+
+ mutex_lock(&ctrl->sched.m_reconf);
+
+ for (i = 0; i < nph; i++)
+ disconnect_port_ch(ctrl, ph[i]);
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return 0;
+}
+EXPORT_SYMBOL(slim_disconnect_ports);
+
+/*
+ * slim_port_xfer: Schedule buffer to be transferred/received using port-handle.
+ * @sb: client handle
+ * @ph: port-handle
+ * @iobuf: buffer to be transferred or populated
+ * @len: buffer size.
+ * @comp: completion signal to indicate transfer done or error.
+ * context: can sleep
+ * Returns number of bytes transferred/received if used synchronously.
+ * Will return 0 if used asynchronously.
+ * Client will call slim_port_get_xfer_status to get error and/or number of
+ * bytes transferred if used asynchronously.
+ */
+int slim_port_xfer(struct slim_device *sb, u32 ph, phys_addr_t iobuf, u32 len,
+ struct completion *comp)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ u8 pn = SLIM_HDL_TO_PORT(ph);
+
+ dev_dbg(&ctrl->dev, "port xfer: num:%d", pn);
+ return ctrl->port_xfer(ctrl, pn, iobuf, len, comp);
+}
+EXPORT_SYMBOL(slim_port_xfer);
+
+/*
+ * slim_port_get_xfer_status: Poll for port transfers, or get transfer status
+ * after completion is done.
+ * @sb: client handle
+ * @ph: port-handle
+ * @done_buf: return pointer (iobuf from slim_port_xfer) which is processed.
+ * @done_len: Number of bytes transferred.
+ * This can be called when port_xfer complition is signalled.
+ * The API will return port transfer error (underflow/overflow/disconnect)
+ * and/or done_len will reflect number of bytes transferred. Note that
+ * done_len may be valid even if port error (overflow/underflow) has happened.
+ * e.g. If the transfer was scheduled with a few bytes to be transferred and
+ * client has not supplied more data to be transferred, done_len will indicate
+ * number of bytes transferred with underflow error. To avoid frequent underflow
+ * errors, multiple transfers can be queued (e.g. ping-pong buffers) so that
+ * channel has data to be transferred even if client is not ready to transfer
+ * data all the time. done_buf will indicate address of the last buffer
+ * processed from the multiple transfers.
+ */
+enum slim_port_err slim_port_get_xfer_status(struct slim_device *sb, u32 ph,
+ phys_addr_t *done_buf, u32 *done_len)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ u8 pn = SLIM_HDL_TO_PORT(ph);
+ u32 la = SLIM_HDL_TO_LA(ph);
+ enum slim_port_err err;
+
+ dev_dbg(&ctrl->dev, "get status port num:%d", pn);
+ /*
+ * Framework only has insight into ports managed by ported device
+ * used by the manager and not slave
+ */
+ if (la != SLIM_LA_MANAGER) {
+ if (done_buf)
+ *done_buf = 0;
+ if (done_len)
+ *done_len = 0;
+ return SLIM_P_NOT_OWNED;
+ }
+ err = ctrl->port_xfer_status(ctrl, pn, done_buf, done_len);
+ if (err == SLIM_P_INPROGRESS)
+ err = ctrl->ports[pn].err;
+ return err;
+}
+EXPORT_SYMBOL(slim_port_get_xfer_status);
+
+static void slim_add_ch(struct slim_controller *ctrl, struct slim_ich *slc)
+{
+ struct slim_ich **arr;
+ int i, j;
+ int *len;
+ int sl = slc->seglen << slc->rootexp;
+ /* Channel is already active and other end is transmitting data */
+ if (slc->state >= SLIM_CH_ACTIVE)
+ return;
+ if (slc->coeff == SLIM_COEFF_1) {
+ arr = ctrl->sched.chc1;
+ len = &ctrl->sched.num_cc1;
+ } else {
+ arr = ctrl->sched.chc3;
+ len = &ctrl->sched.num_cc3;
+ sl *= 3;
+ }
+
+ *len += 1;
+
+ /* Insert the channel based on rootexp and seglen */
+ for (i = 0; i < *len - 1; i++) {
+ /*
+ * Primary key: exp low to high.
+ * Secondary key: seglen: high to low
+ */
+ if ((slc->rootexp > arr[i]->rootexp) ||
+ ((slc->rootexp == arr[i]->rootexp) &&
+ (slc->seglen < arr[i]->seglen)))
+ continue;
+ else
+ break;
+ }
+ for (j = *len - 1; j > i; j--)
+ arr[j] = arr[j - 1];
+ arr[i] = slc;
+ if (!ctrl->allocbw)
+ ctrl->sched.usedslots += sl;
+}
+
+static int slim_remove_ch(struct slim_controller *ctrl, struct slim_ich *slc)
+{
+ struct slim_ich **arr;
+ int i;
+ u32 la, ph;
+ int *len;
+
+ if (slc->coeff == SLIM_COEFF_1) {
+ arr = ctrl->sched.chc1;
+ len = &ctrl->sched.num_cc1;
+ } else {
+ arr = ctrl->sched.chc3;
+ len = &ctrl->sched.num_cc3;
+ }
+
+ for (i = 0; i < *len; i++) {
+ if (arr[i] == slc)
+ break;
+ }
+ if (i >= *len)
+ return -EXFULL;
+ for (; i < *len - 1; i++)
+ arr[i] = arr[i + 1];
+ *len -= 1;
+ arr[*len] = NULL;
+
+ slc->state = SLIM_CH_ALLOCATED;
+ slc->def = 0;
+ slc->newintr = 0;
+ slc->newoff = 0;
+ for (i = 0; i < slc->nsink; i++) {
+ ph = slc->sinkh[i];
+ la = SLIM_HDL_TO_LA(ph);
+ /*
+ * For ports managed by manager's ported device, no need to send
+ * disconnect. It is client's responsibility to call disconnect
+ * on ports owned by the slave device
+ */
+ if (la == SLIM_LA_MANAGER) {
+ ctrl->ports[SLIM_HDL_TO_PORT(ph)].state = SLIM_P_UNCFG;
+ ctrl->ports[SLIM_HDL_TO_PORT(ph)].ch = NULL;
+ }
+ }
+
+ ph = slc->srch;
+ la = SLIM_HDL_TO_LA(ph);
+ if (la == SLIM_LA_MANAGER) {
+ u8 pn = SLIM_HDL_TO_PORT(ph);
+
+ ctrl->ports[pn].state = SLIM_P_UNCFG;
+ ctrl->ports[pn].cfg.watermark = 0;
+ ctrl->ports[pn].cfg.port_opts = 0;
+ }
+
+ kfree(slc->sinkh);
+ slc->sinkh = NULL;
+ slc->srch = 0;
+ slc->nsink = 0;
+ return 0;
+}
+
+static u32 slim_calc_prrate(struct slim_controller *ctrl, struct slim_ch *prop)
+{
+ u32 rate = 0, rate4k = 0, rate11k = 0;
+ u32 exp = 0;
+ u32 pr = 0;
+ bool exact = true;
+ bool done = false;
+ enum slim_ch_rate ratefam;
+
+ if (prop->prot >= SLIM_ASYNC_SMPLX)
+ return 0;
+ if (prop->baser == SLIM_RATE_1HZ) {
+ rate = prop->ratem / 4000;
+ rate4k = rate;
+ if (rate * 4000 == prop->ratem)
+ ratefam = SLIM_RATE_4000HZ;
+ else {
+ rate = prop->ratem / 11025;
+ rate11k = rate;
+ if (rate * 11025 == prop->ratem)
+ ratefam = SLIM_RATE_11025HZ;
+ else
+ ratefam = SLIM_RATE_1HZ;
+ }
+ } else {
+ ratefam = prop->baser;
+ rate = prop->ratem;
+ }
+ if (ratefam == SLIM_RATE_1HZ) {
+ exact = false;
+ if ((rate4k + 1) * 4000 < (rate11k + 1) * 11025) {
+ rate = rate4k + 1;
+ ratefam = SLIM_RATE_4000HZ;
+ } else {
+ rate = rate11k + 1;
+ ratefam = SLIM_RATE_11025HZ;
+ }
+ }
+ /* covert rate to coeff-exp */
+ while (!done) {
+ while ((rate & 0x1) != 0x1) {
+ rate >>= 1;
+ exp++;
+ }
+ if (rate > 3) {
+ /* roundup if not exact */
+ rate++;
+ exact = false;
+ } else
+ done = true;
+ }
+ if (ratefam == SLIM_RATE_4000HZ) {
+ if (rate == 1)
+ pr = 0x10;
+ else {
+ pr = 0;
+ exp++;
+ }
+ } else {
+ pr = 8;
+ exp++;
+ }
+ if (exp <= 7) {
+ pr |= exp;
+ if (exact)
+ pr |= 0x80;
+ } else
+ pr = 0;
+ return pr;
+}
+
+static int slim_nextdefine_ch(struct slim_device *sb, u8 chan)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ u32 chrate = 0;
+ u32 exp = 0;
+ u32 coeff = 0;
+ bool exact = true;
+ bool done = false;
+ int ret = 0;
+ struct slim_ich *slc = &ctrl->chans[chan];
+ struct slim_ch *prop = &slc->prop;
+
+ slc->prrate = slim_calc_prrate(ctrl, prop);
+ dev_dbg(&ctrl->dev, "ch:%d, chan PR rate:%x\n", chan, slc->prrate);
+ if (prop->baser == SLIM_RATE_4000HZ)
+ chrate = 4000 * prop->ratem;
+ else if (prop->baser == SLIM_RATE_11025HZ)
+ chrate = 11025 * prop->ratem;
+ else
+ chrate = prop->ratem;
+ /* max allowed sample freq = 768 seg/frame */
+ if (chrate > 3600000)
+ return -EDQUOT;
+ if (prop->baser == SLIM_RATE_4000HZ &&
+ ctrl->a_framer->superfreq == 4000)
+ coeff = prop->ratem;
+ else if (prop->baser == SLIM_RATE_11025HZ &&
+ ctrl->a_framer->superfreq == 3675)
+ coeff = 3 * prop->ratem;
+ else {
+ u32 tempr = 0;
+
+ tempr = chrate * SLIM_CL_PER_SUPERFRAME_DIV8;
+ coeff = tempr / ctrl->a_framer->rootfreq;
+ if (coeff * ctrl->a_framer->rootfreq != tempr) {
+ coeff++;
+ exact = false;
+ }
+ }
+
+ /* convert coeff to coeff-exponent */
+ exp = 0;
+ while (!done) {
+ while ((coeff & 0x1) != 0x1) {
+ coeff >>= 1;
+ exp++;
+ }
+ if (coeff > 3) {
+ coeff++;
+ exact = false;
+ } else
+ done = true;
+ }
+ if (prop->prot == SLIM_HARD_ISO && !exact)
+ return -EPROTONOSUPPORT;
+ else if (prop->prot == SLIM_AUTO_ISO) {
+ if (exact)
+ prop->prot = SLIM_HARD_ISO;
+ else
+ prop->prot = SLIM_PUSH;
+ }
+ slc->rootexp = exp;
+ slc->seglen = prop->sampleszbits/SLIM_CL_PER_SL;
+ if (prop->prot != SLIM_HARD_ISO)
+ slc->seglen++;
+ if (prop->prot >= SLIM_EXT_SMPLX)
+ slc->seglen++;
+ /* convert coeff to enum */
+ if (coeff == 1) {
+ if (exp > 9)
+ ret = -EIO;
+ coeff = SLIM_COEFF_1;
+ } else {
+ if (exp > 8)
+ ret = -EIO;
+ coeff = SLIM_COEFF_3;
+ }
+ slc->coeff = coeff;
+
+ return ret;
+}
+
+/*
+ * slim_alloc_ch: Allocate a slimbus channel and return its handle.
+ * @sb: client handle.
+ * @chanh: return channel handle
+ * Slimbus channels are limited to 256 per specification.
+ * -EXFULL is returned if all channels are in use.
+ * Although slimbus specification supports 256 channels, a controller may not
+ * support that many channels.
+ */
+int slim_alloc_ch(struct slim_device *sb, u16 *chanh)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ u16 i;
+
+ if (!ctrl)
+ return -EINVAL;
+ mutex_lock(&ctrl->sched.m_reconf);
+ for (i = 0; i < ctrl->nchans; i++) {
+ if (ctrl->chans[i].state == SLIM_CH_FREE)
+ break;
+ }
+ if (i >= ctrl->nchans) {
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return -EXFULL;
+ }
+ *chanh = i;
+ ctrl->chans[i].nextgrp = 0;
+ ctrl->chans[i].state = SLIM_CH_ALLOCATED;
+ ctrl->chans[i].chan = (u8)(ctrl->reserved + i);
+
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return 0;
+}
+EXPORT_SYMBOL(slim_alloc_ch);
+
+/*
+ * slim_query_ch: Get reference-counted handle for a channel number. Every
+ * channel is reference counted by upto one as producer and the others as
+ * consumer)
+ * @sb: client handle
+ * @chan: slimbus channel number
+ * @chanh: return channel handle
+ * If request channel number is not in use, it is allocated, and reference
+ * count is set to one. If the channel was was already allocated, this API
+ * will return handle to that channel and reference count is incremented.
+ * -EXFULL is returned if all channels are in use
+ */
+int slim_query_ch(struct slim_device *sb, u8 ch, u16 *chanh)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ u16 i, j;
+ int ret = 0;
+
+ if (!ctrl || !chanh)
+ return -EINVAL;
+ mutex_lock(&ctrl->sched.m_reconf);
+ /* start with modulo number */
+ i = ch % ctrl->nchans;
+
+ for (j = 0; j < ctrl->nchans; j++) {
+ if (ctrl->chans[i].chan == ch) {
+ *chanh = i;
+ ctrl->chans[i].ref++;
+ if (ctrl->chans[i].state == SLIM_CH_FREE)
+ ctrl->chans[i].state = SLIM_CH_ALLOCATED;
+ goto query_out;
+ }
+ i = (i + 1) % ctrl->nchans;
+ }
+
+ /* Channel not in table yet */
+ ret = -EXFULL;
+ for (j = 0; j < ctrl->nchans; j++) {
+ if (ctrl->chans[i].state == SLIM_CH_FREE) {
+ ctrl->chans[i].state =
+ SLIM_CH_ALLOCATED;
+ *chanh = i;
+ ctrl->chans[i].ref++;
+ ctrl->chans[i].chan = ch;
+ ctrl->chans[i].nextgrp = 0;
+ ret = 0;
+ break;
+ }
+ i = (i + 1) % ctrl->nchans;
+ }
+query_out:
+ mutex_unlock(&ctrl->sched.m_reconf);
+ dev_dbg(&ctrl->dev, "query ch:%d,hdl:%d,ref:%d,ret:%d",
+ ch, i, ctrl->chans[i].ref, ret);
+ return ret;
+}
+EXPORT_SYMBOL(slim_query_ch);
+
+/*
+ * slim_dealloc_ch: Deallocate channel allocated using the API above
+ * -EISCONN is returned if the channel is tried to be deallocated without
+ * being removed first.
+ * -ENOTCONN is returned if deallocation is tried on a channel that's not
+ * allocated.
+ */
+int slim_dealloc_ch(struct slim_device *sb, u16 chanh)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ u8 chan = SLIM_HDL_TO_CHIDX(chanh);
+ struct slim_ich *slc = &ctrl->chans[chan];
+
+ if (!ctrl)
+ return -EINVAL;
+
+ mutex_lock(&ctrl->sched.m_reconf);
+ if (slc->state == SLIM_CH_FREE) {
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return -ENOTCONN;
+ }
+ if (slc->ref > 1) {
+ slc->ref--;
+ mutex_unlock(&ctrl->sched.m_reconf);
+ dev_dbg(&ctrl->dev, "remove chan:%d,hdl:%d,ref:%d",
+ slc->chan, chanh, slc->ref);
+ return 0;
+ }
+ if (slc->state >= SLIM_CH_PENDING_ACTIVE) {
+ dev_err(&ctrl->dev, "Channel:%d should be removed first", chan);
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return -EISCONN;
+ }
+ slc->ref--;
+ slc->state = SLIM_CH_FREE;
+ mutex_unlock(&ctrl->sched.m_reconf);
+ dev_dbg(&ctrl->dev, "remove chan:%d,hdl:%d,ref:%d",
+ slc->chan, chanh, slc->ref);
+ return 0;
+}
+EXPORT_SYMBOL(slim_dealloc_ch);
+
+/*
+ * slim_get_ch_state: Channel state.
+ * This API returns the channel's state (active, suspended, inactive etc)
+ */
+enum slim_ch_state slim_get_ch_state(struct slim_device *sb, u16 chanh)
+{
+ u8 chan = SLIM_HDL_TO_CHIDX(chanh);
+ struct slim_ich *slc = &sb->ctrl->chans[chan];
+
+ return slc->state;
+}
+EXPORT_SYMBOL(slim_get_ch_state);
+
+/*
+ * slim_define_ch: Define a channel.This API defines channel parameters for a
+ * given channel.
+ * @sb: client handle.
+ * @prop: slim_ch structure with channel parameters desired to be used.
+ * @chanh: list of channels to be defined.
+ * @nchan: number of channels in a group (1 if grp is false)
+ * @grp: Are the channels grouped
+ * @grph: return group handle if grouping of channels is desired.
+ * Channels can be grouped if multiple channels use same parameters
+ * (e.g. 5.1 audio has 6 channels with same parameters. They will all be grouped
+ * and given 1 handle for simplicity and avoid repeatedly calling the API)
+ * -EISCONN is returned if channel is already used with different parameters.
+ * -ENXIO is returned if the channel is not yet allocated.
+ */
+int slim_define_ch(struct slim_device *sb, struct slim_ch *prop, u16 *chanh,
+ u8 nchan, bool grp, u16 *grph)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ int i, ret = 0;
+
+ if (!ctrl || !chanh || !prop || !nchan)
+ return -EINVAL;
+ mutex_lock(&ctrl->sched.m_reconf);
+ for (i = 0; i < nchan; i++) {
+ u8 chan = SLIM_HDL_TO_CHIDX(chanh[i]);
+ struct slim_ich *slc = &ctrl->chans[chan];
+
+ dev_dbg(&ctrl->dev, "define_ch: ch:%d, state:%d", chan,
+ (int)ctrl->chans[chan].state);
+ if (slc->state < SLIM_CH_ALLOCATED) {
+ ret = -ENXIO;
+ goto err_define_ch;
+ }
+ if (slc->state >= SLIM_CH_DEFINED && slc->ref >= 2) {
+ if (prop->ratem != slc->prop.ratem ||
+ prop->sampleszbits != slc->prop.sampleszbits ||
+ prop->baser != slc->prop.baser) {
+ ret = -EISCONN;
+ goto err_define_ch;
+ }
+ } else if (slc->state > SLIM_CH_DEFINED) {
+ ret = -EISCONN;
+ goto err_define_ch;
+ } else {
+ ctrl->chans[chan].prop = *prop;
+ ret = slim_nextdefine_ch(sb, chan);
+ if (ret)
+ goto err_define_ch;
+ }
+ if (i < (nchan - 1))
+ ctrl->chans[chan].nextgrp = chanh[i + 1];
+ if (i == 0)
+ ctrl->chans[chan].nextgrp |= SLIM_START_GRP;
+ if (i == (nchan - 1))
+ ctrl->chans[chan].nextgrp |= SLIM_END_GRP;
+ }
+
+ if (grp)
+ *grph = ((nchan << 8) | SLIM_HDL_TO_CHIDX(chanh[0]));
+ for (i = 0; i < nchan; i++) {
+ u8 chan = SLIM_HDL_TO_CHIDX(chanh[i]);
+ struct slim_ich *slc = &ctrl->chans[chan];
+
+ if (slc->state == SLIM_CH_ALLOCATED)
+ slc->state = SLIM_CH_DEFINED;
+ }
+err_define_ch:
+ dev_dbg(&ctrl->dev, "define_ch: ch:%d, ret:%d", *chanh, ret);
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return ret;
+}
+EXPORT_SYMBOL(slim_define_ch);
+
+static u32 getsubfrmcoding(u32 *ctrlw, u32 *subfrml, u32 *msgsl)
+{
+ u32 code = 0;
+
+ if (*ctrlw == *subfrml) {
+ *ctrlw = 8;
+ *subfrml = 8;
+ *msgsl = SLIM_SL_PER_SUPERFRAME - SLIM_FRM_SLOTS_PER_SUPERFRAME
+ - SLIM_GDE_SLOTS_PER_SUPERFRAME;
+ return 0;
+ }
+ if (*subfrml == 6) {
+ code = 0;
+ *msgsl = 256;
+ } else if (*subfrml == 8) {
+ code = 1;
+ *msgsl = 192;
+ } else if (*subfrml == 24) {
+ code = 2;
+ *msgsl = 64;
+ } else { /* 32 */
+ code = 3;
+ *msgsl = 48;
+ }
+
+ if (*ctrlw < 8) {
+ if (*ctrlw >= 6) {
+ *ctrlw = 6;
+ code |= 0x14;
+ } else {
+ if (*ctrlw == 5)
+ *ctrlw = 4;
+ code |= (*ctrlw << 2);
+ }
+ } else {
+ code -= 2;
+ if (*ctrlw >= 24) {
+ *ctrlw = 24;
+ code |= 0x1e;
+ } else if (*ctrlw >= 16) {
+ *ctrlw = 16;
+ code |= 0x1c;
+ } else if (*ctrlw >= 12) {
+ *ctrlw = 12;
+ code |= 0x1a;
+ } else {
+ *ctrlw = 8;
+ code |= 0x18;
+ }
+ }
+
+ *msgsl = (*msgsl * *ctrlw) - SLIM_FRM_SLOTS_PER_SUPERFRAME -
+ SLIM_GDE_SLOTS_PER_SUPERFRAME;
+ return code;
+}
+
+static void shiftsegoffsets(struct slim_controller *ctrl, struct slim_ich **ach,
+ int sz, u32 shft)
+{
+ int i;
+ u32 oldoff;
+
+ for (i = 0; i < sz; i++) {
+ struct slim_ich *slc;
+
+ if (ach[i] == NULL)
+ continue;
+ slc = ach[i];
+ if (slc->state == SLIM_CH_PENDING_REMOVAL)
+ continue;
+ oldoff = slc->newoff;
+ slc->newoff += shft;
+ /* seg. offset must be <= interval */
+ if (slc->newoff >= slc->newintr)
+ slc->newoff -= slc->newintr;
+ }
+}
+
+static inline int slim_sched_4k_coeff1_chans(struct slim_controller *ctrl,
+ struct slim_ich **slc, int *coeff, int *opensl1,
+ u32 expshft, u32 curintr, u32 curmaxsl,
+ int curexp, int finalexp)
+{
+ int coeff1;
+ struct slim_ich *slc1;
+
+ if (unlikely(!coeff || !slc || !ctrl || !opensl1))
+ return -EINVAL;
+
+ coeff1 = *coeff;
+ slc1 = *slc;
+ while ((coeff1 < ctrl->sched.num_cc1) &&
+ (curexp == (int)(slc1->rootexp + expshft))) {
+ if (slc1->state == SLIM_CH_PENDING_REMOVAL) {
+ coeff1++;
+ slc1 = ctrl->sched.chc1[coeff1];
+ continue;
+ }
+ if (opensl1[1] >= opensl1[0] ||
+ (finalexp == (int)slc1->rootexp &&
+ curintr <= 24 && opensl1[0] == curmaxsl)) {
+ opensl1[1] -= slc1->seglen;
+ slc1->newoff = curmaxsl + opensl1[1];
+ if (opensl1[1] < 0 && opensl1[0] == curmaxsl) {
+ opensl1[0] += opensl1[1];
+ opensl1[1] = 0;
+ if (opensl1[0] < 0) {
+ dev_dbg(&ctrl->dev,
+ "reconfig failed:%d\n",
+ __LINE__);
+ return -EXFULL;
+ }
+ }
+ } else {
+ if (slc1->seglen > opensl1[0]) {
+ dev_dbg(&ctrl->dev,
+ "reconfig failed:%d\n", __LINE__);
+ return -EXFULL;
+ }
+ slc1->newoff = opensl1[0] - slc1->seglen;
+ opensl1[0] = slc1->newoff;
+ }
+ slc1->newintr = curintr;
+ coeff1++;
+ slc1 = ctrl->sched.chc1[coeff1];
+ }
+ *coeff = coeff1;
+ *slc = slc1;
+ return 0;
+}
+
+static int slim_sched_chans(struct slim_device *sb, u32 clkgear,
+ u32 *ctrlw, u32 *subfrml)
+{
+ int coeff1, coeff3;
+ enum slim_ch_coeff bias;
+ struct slim_controller *ctrl = sb->ctrl;
+ int last1 = ctrl->sched.num_cc1 - 1;
+ int last3 = ctrl->sched.num_cc3 - 1;
+
+ /*
+ * Find first channels with coeff 1 & 3 as starting points for
+ * scheduling
+ */
+ for (coeff3 = 0; coeff3 < ctrl->sched.num_cc3; coeff3++) {
+ struct slim_ich *slc = ctrl->sched.chc3[coeff3];
+
+ if (slc->state == SLIM_CH_PENDING_REMOVAL)
+ continue;
+ else
+ break;
+ }
+ for (coeff1 = 0; coeff1 < ctrl->sched.num_cc1; coeff1++) {
+ struct slim_ich *slc = ctrl->sched.chc1[coeff1];
+
+ if (slc->state == SLIM_CH_PENDING_REMOVAL)
+ continue;
+ else
+ break;
+ }
+ if (coeff3 == ctrl->sched.num_cc3 && coeff1 == ctrl->sched.num_cc1) {
+ *ctrlw = 8;
+ *subfrml = 8;
+ return 0;
+ } else if (coeff3 == ctrl->sched.num_cc3)
+ bias = SLIM_COEFF_1;
+ else
+ bias = SLIM_COEFF_3;
+
+ /*
+ * Find last chan in coeff1, 3 list, we will use to know when we
+ * have done scheduling all coeff1 channels
+ */
+ while (last1 >= 0) {
+ if (ctrl->sched.chc1[last1] != NULL &&
+ (ctrl->sched.chc1[last1])->state !=
+ SLIM_CH_PENDING_REMOVAL)
+ break;
+ last1--;
+ }
+ while (last3 >= 0) {
+ if (ctrl->sched.chc3[last3] != NULL &&
+ (ctrl->sched.chc3[last3])->state !=
+ SLIM_CH_PENDING_REMOVAL)
+ break;
+ last3--;
+ }
+
+ if (bias == SLIM_COEFF_1) {
+ struct slim_ich *slc1 = ctrl->sched.chc1[coeff1];
+ u32 expshft = SLIM_MAX_CLK_GEAR - clkgear;
+ int curexp, finalexp;
+ u32 curintr, curmaxsl;
+ int opensl1[2];
+ int maxctrlw1;
+ int ret;
+
+ finalexp = (ctrl->sched.chc1[last1])->rootexp;
+ curexp = (int)expshft - 1;
+
+ curintr = (SLIM_MAX_INTR_COEFF_1 * 2) >> (curexp + 1);
+ curmaxsl = curintr >> 1;
+ opensl1[0] = opensl1[1] = curmaxsl;
+
+ while ((coeff1 < ctrl->sched.num_cc1) || (curintr > 24)) {
+ curintr >>= 1;
+ curmaxsl >>= 1;
+
+ /* update 4K family open slot records */
+ if (opensl1[1] < opensl1[0])
+ opensl1[1] -= curmaxsl;
+ else
+ opensl1[1] = opensl1[0] - curmaxsl;
+ opensl1[0] = curmaxsl;
+ if (opensl1[1] < 0) {
+ opensl1[0] += opensl1[1];
+ opensl1[1] = 0;
+ }
+ if (opensl1[0] <= 0) {
+ dev_dbg(&ctrl->dev, "reconfig failed:%d\n",
+ __LINE__);
+ return -EXFULL;
+ }
+ curexp++;
+ /* schedule 4k family channels */
+ ret = slim_sched_4k_coeff1_chans(ctrl, &slc1, &coeff1,
+ opensl1, expshft, curintr, curmaxsl,
+ curexp, finalexp);
+ if (ret)
+ return ret;
+ }
+ /* Leave some slots for messaging space */
+ if (opensl1[1] <= 0 && opensl1[0] <= 0)
+ return -EXFULL;
+ if (opensl1[1] > opensl1[0]) {
+ int temp = opensl1[0];
+
+ opensl1[0] = opensl1[1];
+ opensl1[1] = temp;
+ shiftsegoffsets(ctrl, ctrl->sched.chc1,
+ ctrl->sched.num_cc1, curmaxsl);
+ }
+ /* choose subframe mode to maximize bw */
+ maxctrlw1 = opensl1[0];
+ if (opensl1[0] == curmaxsl)
+ maxctrlw1 += opensl1[1];
+ if (curintr >= 24) {
+ *subfrml = 24;
+ *ctrlw = maxctrlw1;
+ } else if (curintr == 12) {
+ if (maxctrlw1 > opensl1[1] * 4) {
+ *subfrml = 24;
+ *ctrlw = maxctrlw1;
+ } else {
+ *subfrml = 6;
+ *ctrlw = opensl1[1];
+ }
+ } else {
+ *subfrml = 6;
+ *ctrlw = maxctrlw1;
+ }
+ } else {
+ struct slim_ich *slc1 = NULL;
+ struct slim_ich *slc3 = ctrl->sched.chc3[coeff3];
+ u32 expshft = SLIM_MAX_CLK_GEAR - clkgear;
+ int curexp, finalexp, exp1;
+ u32 curintr, curmaxsl;
+ int opensl3[2];
+ int opensl1[6];
+ bool opensl1valid = false;
+ int maxctrlw1, maxctrlw3, i;
+
+ finalexp = (ctrl->sched.chc3[last3])->rootexp;
+ if (last1 >= 0) {
+ slc1 = ctrl->sched.chc1[coeff1];
+ exp1 = (ctrl->sched.chc1[last1])->rootexp;
+ if (exp1 > finalexp)
+ finalexp = exp1;
+ }
+ curexp = (int)expshft - 1;
+
+ curintr = (SLIM_MAX_INTR_COEFF_3 * 2) >> (curexp + 1);
+ curmaxsl = curintr >> 1;
+ opensl3[0] = opensl3[1] = curmaxsl;
+
+ while (coeff1 < ctrl->sched.num_cc1 ||
+ coeff3 < ctrl->sched.num_cc3 ||
+ curintr > 32) {
+ curintr >>= 1;
+ curmaxsl >>= 1;
+
+ /* update 12k family open slot records */
+ if (opensl3[1] < opensl3[0])
+ opensl3[1] -= curmaxsl;
+ else
+ opensl3[1] = opensl3[0] - curmaxsl;
+ opensl3[0] = curmaxsl;
+ if (opensl3[1] < 0) {
+ opensl3[0] += opensl3[1];
+ opensl3[1] = 0;
+ }
+ if (opensl3[0] <= 0) {
+ dev_dbg(&ctrl->dev, "reconfig failed:%d\n",
+ __LINE__);
+ return -EXFULL;
+ }
+ curexp++;
+
+ /* schedule 12k family channels */
+ while (coeff3 < ctrl->sched.num_cc3 &&
+ curexp == (int)slc3->rootexp + expshft) {
+ if (slc3->state == SLIM_CH_PENDING_REMOVAL) {
+ coeff3++;
+ slc3 = ctrl->sched.chc3[coeff3];
+ continue;
+ }
+ opensl1valid = false;
+ if (opensl3[1] >= opensl3[0] ||
+ (finalexp == (int)slc3->rootexp &&
+ curintr <= 32 &&
+ opensl3[0] == curmaxsl &&
+ last1 < 0)) {
+ opensl3[1] -= slc3->seglen;
+ slc3->newoff = curmaxsl + opensl3[1];
+ if (opensl3[1] < 0 &&
+ opensl3[0] == curmaxsl) {
+ opensl3[0] += opensl3[1];
+ opensl3[1] = 0;
+ }
+ if (opensl3[0] < 0) {
+ dev_dbg(&ctrl->dev,
+ "reconfig failed:%d\n",
+ __LINE__);
+ return -EXFULL;
+ }
+ } else {
+ if (slc3->seglen > opensl3[0]) {
+ dev_dbg(&ctrl->dev,
+ "reconfig failed:%d\n",
+ __LINE__);
+ return -EXFULL;
+ }
+ slc3->newoff = opensl3[0] -
+ slc3->seglen;
+ opensl3[0] = slc3->newoff;
+ }
+ slc3->newintr = curintr;
+ coeff3++;
+ slc3 = ctrl->sched.chc3[coeff3];
+ }
+ /* update 4k openslot records */
+ if (opensl1valid == false) {
+ for (i = 0; i < 3; i++) {
+ opensl1[i * 2] = opensl3[0];
+ opensl1[(i * 2) + 1] = opensl3[1];
+ }
+ } else {
+ int opensl1p[6];
+
+ memcpy(opensl1p, opensl1, sizeof(opensl1));
+ for (i = 0; i < 3; i++) {
+ if (opensl1p[i] < opensl1p[i + 3])
+ opensl1[(i * 2) + 1] =
+ opensl1p[i];
+ else
+ opensl1[(i * 2) + 1] =
+ opensl1p[i + 3];
+ }
+ for (i = 0; i < 3; i++) {
+ opensl1[(i * 2) + 1] -= curmaxsl;
+ opensl1[i * 2] = curmaxsl;
+ if (opensl1[(i * 2) + 1] < 0) {
+ opensl1[i * 2] +=
+ opensl1[(i * 2) + 1];
+ opensl1[(i * 2) + 1] = 0;
+ }
+ if (opensl1[i * 2] < 0) {
+ dev_dbg(&ctrl->dev,
+ "reconfig failed:%d\n",
+ __LINE__);
+ return -EXFULL;
+ }
+ }
+ }
+ /* schedule 4k family channels */
+ while (coeff1 < ctrl->sched.num_cc1 &&
+ curexp == (int)slc1->rootexp + expshft) {
+ /* searchorder effective when opensl valid */
+ static const int srcho[] = { 5, 2, 4, 1, 3, 0 };
+ int maxopensl = 0;
+ int maxi = 0;
+
+ if (slc1->state == SLIM_CH_PENDING_REMOVAL) {
+ coeff1++;
+ slc1 = ctrl->sched.chc1[coeff1];
+ continue;
+ }
+ opensl1valid = true;
+ for (i = 0; i < 6; i++) {
+ if (opensl1[srcho[i]] > maxopensl) {
+ maxopensl = opensl1[srcho[i]];
+ maxi = srcho[i];
+ }
+ }
+ opensl1[maxi] -= slc1->seglen;
+ slc1->newoff = (curmaxsl * maxi) +
+ opensl1[maxi];
+ if (opensl1[maxi] < 0 && (maxi & 1) == 1 &&
+ opensl1[maxi - 1] == curmaxsl) {
+ opensl1[maxi - 1] += opensl1[maxi];
+ if (opensl3[0] > opensl1[maxi - 1])
+ opensl3[0] = opensl1[maxi - 1];
+ opensl3[1] = 0;
+ opensl1[maxi] = 0;
+ if (opensl1[maxi - 1] < 0) {
+ dev_dbg(&ctrl->dev,
+ "reconfig failed:%d\n",
+ __LINE__);
+ return -EXFULL;
+ }
+ } else if (opensl1[maxi] < 0) {
+ dev_dbg(&ctrl->dev,
+ "reconfig failed:%d\n",
+ __LINE__);
+ return -EXFULL;
+ } else if (opensl3[maxi & 1] > opensl1[maxi]) {
+ opensl3[maxi & 1] = opensl1[maxi];
+ }
+ slc1->newintr = curintr * 3;
+ coeff1++;
+ slc1 = ctrl->sched.chc1[coeff1];
+ }
+ }
+ /* Leave some slots for messaging space */
+ if (opensl3[1] <= 0 && opensl3[0] <= 0)
+ return -EXFULL;
+ /* swap 1st and 2nd bucket if 2nd bucket has more open slots */
+ if (opensl3[1] > opensl3[0]) {
+ int temp = opensl3[0];
+
+ opensl3[0] = opensl3[1];
+ opensl3[1] = temp;
+ temp = opensl1[5];
+ opensl1[5] = opensl1[4];
+ opensl1[4] = opensl1[3];
+ opensl1[3] = opensl1[2];
+ opensl1[2] = opensl1[1];
+ opensl1[1] = opensl1[0];
+ opensl1[0] = temp;
+ shiftsegoffsets(ctrl, ctrl->sched.chc1,
+ ctrl->sched.num_cc1, curmaxsl);
+ shiftsegoffsets(ctrl, ctrl->sched.chc3,
+ ctrl->sched.num_cc3, curmaxsl);
+ }
+ /* subframe mode to maximize BW */
+ maxctrlw3 = opensl3[0];
+ maxctrlw1 = opensl1[0];
+ if (opensl3[0] == curmaxsl)
+ maxctrlw3 += opensl3[1];
+ for (i = 0; i < 5 && opensl1[i] == curmaxsl; i++)
+ maxctrlw1 += opensl1[i + 1];
+ if (curintr >= 32) {
+ *subfrml = 32;
+ *ctrlw = maxctrlw3;
+ } else if (curintr == 16) {
+ if (maxctrlw3 > (opensl3[1] * 4)) {
+ *subfrml = 32;
+ *ctrlw = maxctrlw3;
+ } else {
+ *subfrml = 8;
+ *ctrlw = opensl3[1];
+ }
+ } else {
+ if ((maxctrlw1 * 8) >= (maxctrlw3 * 24)) {
+ *subfrml = 24;
+ *ctrlw = maxctrlw1;
+ } else {
+ *subfrml = 8;
+ *ctrlw = maxctrlw3;
+ }
+ }
+ }
+ return 0;
+}
+
+#ifdef DEBUG
+static int slim_verifychansched(struct slim_controller *ctrl, u32 ctrlw,
+ u32 subfrml, u32 clkgear)
+{
+ int sl, i;
+ int cc1 = 0;
+ int cc3 = 0;
+ struct slim_ich *slc = NULL;
+
+ if (!ctrl->sched.slots)
+ return 0;
+ memset(ctrl->sched.slots, 0, SLIM_SL_PER_SUPERFRAME);
+ dev_dbg(&ctrl->dev, "Clock gear is:%d\n", clkgear);
+ for (sl = 0; sl < SLIM_SL_PER_SUPERFRAME; sl += subfrml) {
+ for (i = 0; i < ctrlw; i++)
+ ctrl->sched.slots[sl + i] = 33;
+ }
+ while (cc1 < ctrl->sched.num_cc1) {
+ slc = ctrl->sched.chc1[cc1];
+ if (slc == NULL) {
+ dev_err(&ctrl->dev, "SLC1 null in verify: chan%d\n",
+ cc1);
+ return -EIO;
+ }
+ dev_dbg(&ctrl->dev, "chan:%d, offset:%d, intr:%d, seglen:%d\n",
+ (slc - ctrl->chans), slc->newoff,
+ slc->newintr, slc->seglen);
+
+ if (slc->state != SLIM_CH_PENDING_REMOVAL) {
+ for (sl = slc->newoff;
+ sl < SLIM_SL_PER_SUPERFRAME;
+ sl += slc->newintr) {
+ for (i = 0; i < slc->seglen; i++) {
+ if (ctrl->sched.slots[sl + i])
+ return -EXFULL;
+ ctrl->sched.slots[sl + i] = cc1 + 1;
+ }
+ }
+ }
+ cc1++;
+ }
+ while (cc3 < ctrl->sched.num_cc3) {
+ slc = ctrl->sched.chc3[cc3];
+ if (slc == NULL) {
+ dev_err(&ctrl->dev, "SLC3 null in verify: chan%d\n",
+ cc3);
+ return -EIO;
+ }
+ dev_dbg(&ctrl->dev, "chan:%d, offset:%d, intr:%d, seglen:%d\n",
+ (slc - ctrl->chans), slc->newoff,
+ slc->newintr, slc->seglen);
+ if (slc->state != SLIM_CH_PENDING_REMOVAL) {
+ for (sl = slc->newoff;
+ sl < SLIM_SL_PER_SUPERFRAME;
+ sl += slc->newintr) {
+ for (i = 0; i < slc->seglen; i++) {
+ if (ctrl->sched.slots[sl + i])
+ return -EXFULL;
+ ctrl->sched.slots[sl + i] = cc3 + 1;
+ }
+ }
+ }
+ cc3++;
+ }
+
+ return 0;
+}
+#else
+static int slim_verifychansched(struct slim_controller *ctrl, u32 ctrlw,
+ u32 subfrml, u32 clkgear)
+{
+ return 0;
+}
+#endif
+
+static void slim_sort_chan_grp(struct slim_controller *ctrl,
+ struct slim_ich *slc)
+{
+ u8 last = (u8)-1;
+ u8 second = 0;
+
+ for (; last > 0; last--) {
+ struct slim_ich *slc1 = slc;
+ struct slim_ich *slc2;
+ u8 next = SLIM_HDL_TO_CHIDX(slc1->nextgrp);
+
+ slc2 = &ctrl->chans[next];
+ for (second = 1; second <= last && slc2 &&
+ (slc2->state == SLIM_CH_ACTIVE ||
+ slc2->state == SLIM_CH_PENDING_ACTIVE); second++) {
+ if (slc1->newoff > slc2->newoff) {
+ u32 temp = slc2->newoff;
+
+ slc2->newoff = slc1->newoff;
+ slc1->newoff = temp;
+ }
+ if (slc2->nextgrp & SLIM_END_GRP) {
+ last = second;
+ break;
+ }
+ slc1 = slc2;
+ next = SLIM_HDL_TO_CHIDX(slc1->nextgrp);
+ slc2 = &ctrl->chans[next];
+ }
+ if (slc2 == NULL)
+ last = second - 1;
+ }
+}
+
+
+static int slim_allocbw(struct slim_device *sb, int *subfrmc, int *clkgear)
+{
+ u32 msgsl = 0;
+ u32 ctrlw = 0;
+ u32 subfrml = 0;
+ int ret = -EIO;
+ struct slim_controller *ctrl = sb->ctrl;
+ u32 usedsl = ctrl->sched.usedslots + ctrl->sched.pending_msgsl;
+ u32 availsl = SLIM_SL_PER_SUPERFRAME - SLIM_FRM_SLOTS_PER_SUPERFRAME -
+ SLIM_GDE_SLOTS_PER_SUPERFRAME;
+ *clkgear = SLIM_MAX_CLK_GEAR;
+
+ dev_dbg(&ctrl->dev, "used sl:%u, availlable sl:%u\n", usedsl, availsl);
+ dev_dbg(&ctrl->dev, "pending:chan sl:%u, :msg sl:%u, clkgear:%u\n",
+ ctrl->sched.usedslots,
+ ctrl->sched.pending_msgsl, *clkgear);
+ /*
+ * If number of slots are 0, that means channels are inactive.
+ * It is very likely that the manager will call clock pause very soon.
+ * By making sure that bus is in MAX_GEAR, clk pause sequence will take
+ * minimum amount of time.
+ */
+ if (ctrl->sched.usedslots != 0) {
+ while ((usedsl * 2 <= availsl) && (*clkgear > ctrl->min_cg)) {
+ *clkgear -= 1;
+ usedsl *= 2;
+ }
+ }
+
+ /*
+ * Try scheduling data channels at current clock gear, if all channels
+ * can be scheduled, or reserved BW can't be satisfied, increase clock
+ * gear and try again
+ */
+ for (; *clkgear <= ctrl->max_cg; (*clkgear)++) {
+ ret = slim_sched_chans(sb, *clkgear, &ctrlw, &subfrml);
+
+ if (ret == 0) {
+ *subfrmc = getsubfrmcoding(&ctrlw, &subfrml, &msgsl);
+ if ((msgsl >> (ctrl->max_cg - *clkgear) <
+ ctrl->sched.pending_msgsl) &&
+ (*clkgear < ctrl->max_cg))
+ continue;
+ else
+ break;
+ }
+ }
+ if (ret == 0) {
+ int i;
+ /* Sort channel-groups */
+ for (i = 0; i < ctrl->sched.num_cc1; i++) {
+ struct slim_ich *slc = ctrl->sched.chc1[i];
+
+ if (slc->state == SLIM_CH_PENDING_REMOVAL)
+ continue;
+ if ((slc->nextgrp & SLIM_START_GRP) &&
+ !(slc->nextgrp & SLIM_END_GRP)) {
+ slim_sort_chan_grp(ctrl, slc);
+ }
+ }
+ for (i = 0; i < ctrl->sched.num_cc3; i++) {
+ struct slim_ich *slc = ctrl->sched.chc3[i];
+
+ if (slc->state == SLIM_CH_PENDING_REMOVAL)
+ continue;
+ if ((slc->nextgrp & SLIM_START_GRP) &&
+ !(slc->nextgrp & SLIM_END_GRP)) {
+ slim_sort_chan_grp(ctrl, slc);
+ }
+ }
+
+ ret = slim_verifychansched(ctrl, ctrlw, subfrml, *clkgear);
+ }
+
+ return ret;
+}
+
+static void slim_change_existing_chans(struct slim_controller *ctrl, int coeff)
+{
+ struct slim_ich **arr;
+ int len, i;
+
+ if (coeff == SLIM_COEFF_1) {
+ arr = ctrl->sched.chc1;
+ len = ctrl->sched.num_cc1;
+ } else {
+ arr = ctrl->sched.chc3;
+ len = ctrl->sched.num_cc3;
+ }
+ for (i = 0; i < len; i++) {
+ struct slim_ich *slc = arr[i];
+
+ if (slc->state == SLIM_CH_ACTIVE ||
+ slc->state == SLIM_CH_SUSPENDED)
+ slc->offset = slc->newoff;
+ slc->interval = slc->newintr;
+ }
+}
+static void slim_chan_changes(struct slim_device *sb, bool revert)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+
+ while (!list_empty(&sb->mark_define)) {
+ struct slim_ich *slc;
+ struct slim_pending_ch *pch =
+ list_entry(sb->mark_define.next,
+ struct slim_pending_ch, pending);
+ slc = &ctrl->chans[pch->chan];
+ if (revert) {
+ if (slc->state == SLIM_CH_PENDING_ACTIVE) {
+ u32 sl = slc->seglen << slc->rootexp;
+
+ if (slc->coeff == SLIM_COEFF_3)
+ sl *= 3;
+ if (!ctrl->allocbw)
+ ctrl->sched.usedslots -= sl;
+ slim_remove_ch(ctrl, slc);
+ slc->state = SLIM_CH_DEFINED;
+ }
+ } else {
+ slc->state = SLIM_CH_ACTIVE;
+ slc->def++;
+ }
+ list_del_init(&pch->pending);
+ kfree(pch);
+ }
+
+ while (!list_empty(&sb->mark_removal)) {
+ struct slim_pending_ch *pch =
+ list_entry(sb->mark_removal.next,
+ struct slim_pending_ch, pending);
+ struct slim_ich *slc = &ctrl->chans[pch->chan];
+ u32 sl = slc->seglen << slc->rootexp;
+
+ if (revert || slc->def > 0) {
+ if (slc->coeff == SLIM_COEFF_3)
+ sl *= 3;
+ if (!ctrl->allocbw)
+ ctrl->sched.usedslots += sl;
+ if (revert)
+ slc->def++;
+ slc->state = SLIM_CH_ACTIVE;
+ } else
+ slim_remove_ch(ctrl, slc);
+ list_del_init(&pch->pending);
+ kfree(pch);
+ }
+
+ while (!list_empty(&sb->mark_suspend)) {
+ struct slim_pending_ch *pch =
+ list_entry(sb->mark_suspend.next,
+ struct slim_pending_ch, pending);
+ struct slim_ich *slc = &ctrl->chans[pch->chan];
+
+ if (revert)
+ slc->state = SLIM_CH_ACTIVE;
+ list_del_init(&pch->pending);
+ kfree(pch);
+ }
+ /* Change already active channel if reconfig succeeded */
+ if (!revert) {
+ slim_change_existing_chans(ctrl, SLIM_COEFF_1);
+ slim_change_existing_chans(ctrl, SLIM_COEFF_3);
+ }
+}
+
+/*
+ * slim_reconfigure_now: Request reconfiguration now.
+ * @sb: client handle
+ * This API does what commit flag in other scheduling APIs do.
+ * -EXFULL is returned if there is no space in TDM to reserve the
+ * bandwidth. -EBUSY is returned if reconfiguration request is already in
+ * progress.
+ */
+int slim_reconfigure_now(struct slim_device *sb)
+{
+ u8 i;
+ u8 wbuf[4];
+ u32 clkgear, subframe;
+ u32 curexp;
+ int ret;
+ struct slim_controller *ctrl = sb->ctrl;
+ u32 expshft;
+ u32 segdist;
+ struct slim_pending_ch *pch;
+ DEFINE_SLIM_BCAST_TXN(txn, SLIM_MSG_MC_BEGIN_RECONFIGURATION, 0, 3,
+ NULL, NULL, sb->laddr);
+
+ mutex_lock(&ctrl->sched.m_reconf);
+ /*
+ * If there are no pending changes from this client, avoid sending
+ * the reconfiguration sequence
+ */
+ if (sb->pending_msgsl == sb->cur_msgsl &&
+ list_empty(&sb->mark_define) &&
+ list_empty(&sb->mark_suspend)) {
+ struct list_head *pos, *next;
+
+ list_for_each_safe(pos, next, &sb->mark_removal) {
+ struct slim_ich *slc;
+
+ pch = list_entry(pos, struct slim_pending_ch, pending);
+ slc = &ctrl->chans[pch->chan];
+ if (slc->def > 0)
+ slc->def--;
+ /* Disconnect source port to free it up */
+ if (SLIM_HDL_TO_LA(slc->srch) == sb->laddr)
+ slc->srch = 0;
+ /*
+ * If controller overrides BW allocation,
+ * delete this in remove channel itself
+ */
+ if (slc->def != 0 && !ctrl->allocbw) {
+ list_del(&pch->pending);
+ kfree(pch);
+ }
+ }
+ if (list_empty(&sb->mark_removal)) {
+ mutex_unlock(&ctrl->sched.m_reconf);
+ pr_info("SLIM_CL: skip reconfig sequence");
+ return 0;
+ }
+ }
+
+ ctrl->sched.pending_msgsl += sb->pending_msgsl - sb->cur_msgsl;
+ list_for_each_entry(pch, &sb->mark_define, pending) {
+ struct slim_ich *slc = &ctrl->chans[pch->chan];
+
+ slim_add_ch(ctrl, slc);
+ if (slc->state < SLIM_CH_ACTIVE)
+ slc->state = SLIM_CH_PENDING_ACTIVE;
+ }
+
+ list_for_each_entry(pch, &sb->mark_removal, pending) {
+ struct slim_ich *slc = &ctrl->chans[pch->chan];
+ u32 sl = slc->seglen << slc->rootexp;
+
+ if (slc->coeff == SLIM_COEFF_3)
+ sl *= 3;
+ if (!ctrl->allocbw)
+ ctrl->sched.usedslots -= sl;
+ slc->state = SLIM_CH_PENDING_REMOVAL;
+ }
+ list_for_each_entry(pch, &sb->mark_suspend, pending) {
+ struct slim_ich *slc = &ctrl->chans[pch->chan];
+
+ slc->state = SLIM_CH_SUSPENDED;
+ }
+
+ /*
+ * Controller can override default channel scheduling algorithm.
+ * (e.g. if controller needs to use fixed channel scheduling based
+ * on number of channels)
+ */
+ if (ctrl->allocbw)
+ ret = ctrl->allocbw(sb, &subframe, &clkgear);
+ else
+ ret = slim_allocbw(sb, &subframe, &clkgear);
+
+ if (!ret) {
+ ret = slim_processtxn(ctrl, &txn, false);
+ dev_dbg(&ctrl->dev, "sending begin_reconfig:ret:%d\n", ret);
+ }
+
+ if (!ret && subframe != ctrl->sched.subfrmcode) {
+ wbuf[0] = (u8)(subframe & 0xFF);
+ txn.mc = SLIM_MSG_MC_NEXT_SUBFRAME_MODE;
+ txn.len = 1;
+ txn.rl = 4;
+ txn.wbuf = wbuf;
+ ret = slim_processtxn(ctrl, &txn, false);
+ dev_dbg(&ctrl->dev, "sending subframe:%d,ret:%d\n",
+ (int)wbuf[0], ret);
+ }
+ if (!ret && clkgear != ctrl->clkgear) {
+ wbuf[0] = (u8)(clkgear & 0xFF);
+ txn.mc = SLIM_MSG_MC_NEXT_CLOCK_GEAR;
+ txn.len = 1;
+ txn.rl = 4;
+ txn.wbuf = wbuf;
+ ret = slim_processtxn(ctrl, &txn, false);
+ dev_dbg(&ctrl->dev, "sending clkgear:%d,ret:%d\n",
+ (int)wbuf[0], ret);
+ }
+ if (ret)
+ goto revert_reconfig;
+
+ expshft = SLIM_MAX_CLK_GEAR - clkgear;
+ /* activate/remove channel */
+ list_for_each_entry(pch, &sb->mark_define, pending) {
+ struct slim_ich *slc = &ctrl->chans[pch->chan];
+ /* Define content */
+ wbuf[0] = slc->chan;
+ wbuf[1] = slc->prrate;
+ wbuf[2] = slc->prop.dataf | (slc->prop.auxf << 4);
+ wbuf[3] = slc->prop.sampleszbits / SLIM_CL_PER_SL;
+ txn.mc = SLIM_MSG_MC_NEXT_DEFINE_CONTENT;
+ txn.len = 4;
+ txn.rl = 7;
+ txn.wbuf = wbuf;
+ dev_dbg(&ctrl->dev, "define content, activate:%x, %x, %x, %x\n",
+ wbuf[0], wbuf[1], wbuf[2], wbuf[3]);
+ /* Right now, channel link bit is not supported */
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ goto revert_reconfig;
+
+ txn.mc = SLIM_MSG_MC_NEXT_ACTIVATE_CHANNEL;
+ txn.len = 1;
+ txn.rl = 4;
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ goto revert_reconfig;
+ }
+
+ list_for_each_entry(pch, &sb->mark_removal, pending) {
+ struct slim_ich *slc = &ctrl->chans[pch->chan];
+
+ dev_dbg(&ctrl->dev, "remove chan:%x\n", pch->chan);
+ wbuf[0] = slc->chan;
+ txn.mc = SLIM_MSG_MC_NEXT_REMOVE_CHANNEL;
+ txn.len = 1;
+ txn.rl = 4;
+ txn.wbuf = wbuf;
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ goto revert_reconfig;
+ }
+ list_for_each_entry(pch, &sb->mark_suspend, pending) {
+ struct slim_ich *slc = &ctrl->chans[pch->chan];
+
+ dev_dbg(&ctrl->dev, "suspend chan:%x\n", pch->chan);
+ wbuf[0] = slc->chan;
+ txn.mc = SLIM_MSG_MC_NEXT_DEACTIVATE_CHANNEL;
+ txn.len = 1;
+ txn.rl = 4;
+ txn.wbuf = wbuf;
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ goto revert_reconfig;
+ }
+
+ /* Define CC1 channel */
+ for (i = 0; i < ctrl->sched.num_cc1; i++) {
+ struct slim_ich *slc = ctrl->sched.chc1[i];
+
+ if (slc->state == SLIM_CH_PENDING_REMOVAL)
+ continue;
+ curexp = slc->rootexp + expshft;
+ segdist = (slc->newoff << curexp) & 0x1FF;
+ expshft = SLIM_MAX_CLK_GEAR - clkgear;
+ dev_dbg(&ctrl->dev, "new-intr:%d, old-intr:%d, dist:%d\n",
+ slc->newintr, slc->interval, segdist);
+ dev_dbg(&ctrl->dev, "new-off:%d, old-off:%d\n",
+ slc->newoff, slc->offset);
+
+ if (slc->state < SLIM_CH_ACTIVE || slc->def < slc->ref ||
+ slc->newintr != slc->interval ||
+ slc->newoff != slc->offset) {
+ segdist |= 0x200;
+ segdist >>= curexp;
+ segdist |= (slc->newoff << (curexp + 1)) & 0xC00;
+ wbuf[0] = slc->chan;
+ wbuf[1] = (u8)(segdist & 0xFF);
+ wbuf[2] = (u8)((segdist & 0xF00) >> 8) |
+ (slc->prop.prot << 4);
+ wbuf[3] = slc->seglen;
+ txn.mc = SLIM_MSG_MC_NEXT_DEFINE_CHANNEL;
+ txn.len = 4;
+ txn.rl = 7;
+ txn.wbuf = wbuf;
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ goto revert_reconfig;
+ }
+ }
+
+ /* Define CC3 channels */
+ for (i = 0; i < ctrl->sched.num_cc3; i++) {
+ struct slim_ich *slc = ctrl->sched.chc3[i];
+
+ if (slc->state == SLIM_CH_PENDING_REMOVAL)
+ continue;
+ curexp = slc->rootexp + expshft;
+ segdist = (slc->newoff << curexp) & 0x1FF;
+ expshft = SLIM_MAX_CLK_GEAR - clkgear;
+ dev_dbg(&ctrl->dev, "new-intr:%d, old-intr:%d, dist:%d\n",
+ slc->newintr, slc->interval, segdist);
+ dev_dbg(&ctrl->dev, "new-off:%d, old-off:%d\n",
+ slc->newoff, slc->offset);
+
+ if (slc->state < SLIM_CH_ACTIVE || slc->def < slc->ref ||
+ slc->newintr != slc->interval ||
+ slc->newoff != slc->offset) {
+ segdist |= 0x200;
+ segdist >>= curexp;
+ segdist |= 0xC00;
+ wbuf[0] = slc->chan;
+ wbuf[1] = (u8)(segdist & 0xFF);
+ wbuf[2] = (u8)((segdist & 0xF00) >> 8) |
+ (slc->prop.prot << 4);
+ wbuf[3] = (u8)(slc->seglen);
+ txn.mc = SLIM_MSG_MC_NEXT_DEFINE_CHANNEL;
+ txn.len = 4;
+ txn.rl = 7;
+ txn.wbuf = wbuf;
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ goto revert_reconfig;
+ }
+ }
+ txn.mc = SLIM_MSG_MC_RECONFIGURE_NOW;
+ txn.len = 0;
+ txn.rl = 3;
+ txn.wbuf = NULL;
+ ret = slim_processtxn(ctrl, &txn, false);
+ dev_dbg(&ctrl->dev, "reconfig now:ret:%d\n", ret);
+ if (!ret) {
+ ctrl->sched.subfrmcode = subframe;
+ ctrl->clkgear = clkgear;
+ ctrl->sched.msgsl = ctrl->sched.pending_msgsl;
+ sb->cur_msgsl = sb->pending_msgsl;
+ slim_chan_changes(sb, false);
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return 0;
+ }
+
+revert_reconfig:
+ /* Revert channel changes */
+ slim_chan_changes(sb, true);
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return ret;
+}
+EXPORT_SYMBOL(slim_reconfigure_now);
+
+static int add_pending_ch(struct list_head *listh, u8 chan)
+{
+ struct slim_pending_ch *pch;
+
+ pch = kmalloc(sizeof(struct slim_pending_ch), GFP_KERNEL);
+ if (!pch)
+ return -ENOMEM;
+ pch->chan = chan;
+ list_add_tail(&pch->pending, listh);
+ return 0;
+}
+
+/*
+ * slim_control_ch: Channel control API.
+ * @sb: client handle
+ * @chanh: group or channel handle to be controlled
+ * @chctrl: Control command (activate/suspend/remove)
+ * @commit: flag to indicate whether the control should take effect right-away.
+ * This API activates, removes or suspends a channel (or group of channels)
+ * chanh indicates the channel or group handle (returned by the define_ch API).
+ * Reconfiguration may be time-consuming since it can change all other active
+ * channel allocations on the bus, change in clock gear used by the slimbus,
+ * and change in the control space width used for messaging.
+ * commit makes sure that multiple channels can be activated/deactivated before
+ * reconfiguration is started.
+ * -EXFULL is returned if there is no space in TDM to reserve the bandwidth.
+ * -EISCONN/-ENOTCONN is returned if the channel is already connected or not
+ * yet defined.
+ * -EINVAL is returned if individual control of a grouped-channel is attempted.
+ */
+int slim_control_ch(struct slim_device *sb, u16 chanh,
+ enum slim_ch_control chctrl, bool commit)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ int ret = 0;
+ /* Get rid of the group flag in MSB if any */
+ u8 chan = SLIM_HDL_TO_CHIDX(chanh);
+ u8 nchan = 0;
+ struct slim_ich *slc = &ctrl->chans[chan];
+
+ if (!(slc->nextgrp & SLIM_START_GRP))
+ return -EINVAL;
+
+ mutex_lock(&sb->sldev_reconf);
+ mutex_lock(&ctrl->sched.m_reconf);
+ do {
+ struct slim_pending_ch *pch;
+ u8 add_mark_removal = true;
+
+ slc = &ctrl->chans[chan];
+ dev_dbg(&ctrl->dev, "chan:%d,ctrl:%d,def:%d", chan, chctrl,
+ slc->def);
+ if (slc->state < SLIM_CH_DEFINED) {
+ ret = -ENOTCONN;
+ break;
+ }
+ if (chctrl == SLIM_CH_SUSPEND) {
+ ret = add_pending_ch(&sb->mark_suspend, chan);
+ if (ret)
+ break;
+ } else if (chctrl == SLIM_CH_ACTIVATE) {
+ if (slc->state > SLIM_CH_ACTIVE) {
+ ret = -EISCONN;
+ break;
+ }
+ ret = add_pending_ch(&sb->mark_define, chan);
+ if (ret)
+ break;
+ } else {
+ if (slc->state < SLIM_CH_ACTIVE) {
+ ret = -ENOTCONN;
+ break;
+ }
+ /* If channel removal request comes when pending
+ * in the mark_define, remove it from the define
+ * list instead of adding it to removal list
+ */
+ if (!list_empty(&sb->mark_define)) {
+ struct list_head *pos, *next;
+
+ list_for_each_safe(pos, next,
+ &sb->mark_define) {
+ pch = list_entry(pos,
+ struct slim_pending_ch,
+ pending);
+ if (pch->chan == chan) {
+ list_del(&pch->pending);
+ kfree(pch);
+ add_mark_removal = false;
+ break;
+ }
+ }
+ }
+ if (add_mark_removal == true) {
+ ret = add_pending_ch(&sb->mark_removal, chan);
+ if (ret)
+ break;
+ }
+ }
+
+ nchan++;
+ if (nchan < SLIM_GRP_TO_NCHAN(chanh))
+ chan = SLIM_HDL_TO_CHIDX(slc->nextgrp);
+ } while (nchan < SLIM_GRP_TO_NCHAN(chanh));
+ mutex_unlock(&ctrl->sched.m_reconf);
+ if (!ret && commit == true)
+ ret = slim_reconfigure_now(sb);
+ mutex_unlock(&sb->sldev_reconf);
+ return ret;
+}
+EXPORT_SYMBOL(slim_control_ch);
+
+/*
+ * slim_reservemsg_bw: Request to reserve bandwidth for messages.
+ * @sb: client handle
+ * @bw_bps: message bandwidth in bits per second to be requested
+ * @commit: indicates whether the reconfiguration needs to be acted upon.
+ * This API call can be grouped with slim_control_ch API call with only one of
+ * the APIs specifying the commit flag to avoid reconfiguration being called too
+ * frequently. -EXFULL is returned if there is no space in TDM to reserve the
+ * bandwidth. -EBUSY is returned if reconfiguration is requested, but a request
+ * is already in progress.
+ */
+int slim_reservemsg_bw(struct slim_device *sb, u32 bw_bps, bool commit)
+{
+ struct slim_controller *ctrl = sb->ctrl;
+ int ret = 0;
+ int sl;
+
+ mutex_lock(&sb->sldev_reconf);
+ if ((bw_bps >> 3) >= ctrl->a_framer->rootfreq)
+ sl = SLIM_SL_PER_SUPERFRAME;
+ else {
+ sl = (bw_bps * (SLIM_CL_PER_SUPERFRAME_DIV8/SLIM_CL_PER_SL/2) +
+ (ctrl->a_framer->rootfreq/2 - 1)) /
+ (ctrl->a_framer->rootfreq/2);
+ }
+ dev_dbg(&ctrl->dev, "request:bw:%d, slots:%d, current:%d\n", bw_bps, sl,
+ sb->cur_msgsl);
+ sb->pending_msgsl = sl;
+ if (commit == true)
+ ret = slim_reconfigure_now(sb);
+ mutex_unlock(&sb->sldev_reconf);
+ return ret;
+}
+EXPORT_SYMBOL(slim_reservemsg_bw);
+
+/*
+ * slim_ctrl_clk_pause: Called by slimbus controller to request clock to be
+ * paused or woken up out of clock pause
+ * or woken up from clock pause
+ * @ctrl: controller requesting bus to be paused or woken up
+ * @wakeup: Wakeup this controller from clock pause.
+ * @restart: Restart time value per spec used for clock pause. This value
+ * isn't used when controller is to be woken up.
+ * This API executes clock pause reconfiguration sequence if wakeup is false.
+ * If wakeup is true, controller's wakeup is called
+ * Slimbus clock is idle and can be disabled by the controller later.
+ */
+int slim_ctrl_clk_pause(struct slim_controller *ctrl, bool wakeup, u8 restart)
+{
+ int ret = 0;
+ int i;
+ DEFINE_SLIM_BCAST_TXN(txn, SLIM_MSG_CLK_PAUSE_SEQ_FLG |
+ SLIM_MSG_MC_BEGIN_RECONFIGURATION, 0, 3,
+ NULL, NULL, 0);
+
+ if (wakeup == false && restart > SLIM_CLK_UNSPECIFIED)
+ return -EINVAL;
+ mutex_lock(&ctrl->m_ctrl);
+ if (wakeup) {
+ if (ctrl->clk_state == SLIM_CLK_ACTIVE) {
+ mutex_unlock(&ctrl->m_ctrl);
+ return 0;
+ }
+ wait_for_completion(&ctrl->pause_comp);
+ /*
+ * Slimbus framework will call controller wakeup
+ * Controller should make sure that it sets active framer
+ * out of clock pause by doing appropriate setting
+ */
+ if (ctrl->clk_state == SLIM_CLK_PAUSED && ctrl->wakeup)
+ ret = ctrl->wakeup(ctrl);
+ /*
+ * If wakeup fails, make sure that next attempt can succeed.
+ * Since we already consumed pause_comp, complete it so
+ * that next wakeup isn't blocked forever
+ */
+ if (!ret)
+ ctrl->clk_state = SLIM_CLK_ACTIVE;
+ else
+ complete(&ctrl->pause_comp);
+ mutex_unlock(&ctrl->m_ctrl);
+ return ret;
+ }
+
+ switch (ctrl->clk_state) {
+ case SLIM_CLK_ENTERING_PAUSE:
+ case SLIM_CLK_PAUSE_FAILED:
+ /*
+ * If controller is already trying to enter clock pause,
+ * let it finish.
+ * In case of error, retry
+ * In both cases, previous clock pause has signalled
+ * completion.
+ */
+ wait_for_completion(&ctrl->pause_comp);
+ /* retry upon failure */
+ if (ctrl->clk_state == SLIM_CLK_PAUSE_FAILED) {
+ ctrl->clk_state = SLIM_CLK_ACTIVE;
+ } else {
+ mutex_unlock(&ctrl->m_ctrl);
+ /*
+ * Signal completion so that wakeup can wait on
+ * it.
+ */
+ complete(&ctrl->pause_comp);
+ return 0;
+ }
+ break;
+ case SLIM_CLK_PAUSED:
+ /* already paused */
+ mutex_unlock(&ctrl->m_ctrl);
+ return 0;
+ case SLIM_CLK_ACTIVE:
+ default:
+ break;
+ }
+ /* Pending response for a message */
+ for (i = 0; i < ctrl->last_tid; i++) {
+ if (ctrl->txnt[i]) {
+ ret = -EBUSY;
+ pr_info("slim_clk_pause: txn-rsp for %d pending", i);
+ mutex_unlock(&ctrl->m_ctrl);
+ return -EBUSY;
+ }
+ }
+ ctrl->clk_state = SLIM_CLK_ENTERING_PAUSE;
+ mutex_unlock(&ctrl->m_ctrl);
+
+ mutex_lock(&ctrl->sched.m_reconf);
+ /* Data channels active */
+ if (ctrl->sched.usedslots) {
+ pr_info("slim_clk_pause: data channel active");
+ ret = -EBUSY;
+ goto clk_pause_ret;
+ }
+
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ goto clk_pause_ret;
+
+ txn.mc = SLIM_MSG_CLK_PAUSE_SEQ_FLG | SLIM_MSG_MC_NEXT_PAUSE_CLOCK;
+ txn.len = 1;
+ txn.rl = 4;
+ txn.wbuf = &restart;
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ goto clk_pause_ret;
+
+ txn.mc = SLIM_MSG_CLK_PAUSE_SEQ_FLG | SLIM_MSG_MC_RECONFIGURE_NOW;
+ txn.len = 0;
+ txn.rl = 3;
+ txn.wbuf = NULL;
+ ret = slim_processtxn(ctrl, &txn, false);
+ if (ret)
+ goto clk_pause_ret;
+
+clk_pause_ret:
+ if (ret)
+ ctrl->clk_state = SLIM_CLK_PAUSE_FAILED;
+ else
+ ctrl->clk_state = SLIM_CLK_PAUSED;
+ complete(&ctrl->pause_comp);
+ mutex_unlock(&ctrl->sched.m_reconf);
+ return ret;
+}
+EXPORT_SYMBOL(slim_ctrl_clk_pause);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Slimbus module");
+MODULE_ALIAS("platform:slimbus");