| /* Copyright (c) 2011-2014, 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; |
| |
| 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 (strncmp(slim_dev->name, id->name, SLIMBUS_NAME_SIZE) == 0) |
| return id; |
| id++; |
| } |
| return NULL; |
| } |
| |
| 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 strncmp(slim_dev->name, driver->name, SLIMBUS_NAME_SIZE) |
| == 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, |
| pm_generic_runtime_idle |
| ) |
| }; |
| struct bus_type slimbus_type = { |
| .name = "slimbus", |
| .match = slim_device_match, |
| .pm = &slimbus_pm, |
| }; |
| EXPORT_SYMBOL_GPL(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_GPL(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_GPL(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_GPL(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 n) |
| { |
| struct sbi_boardinfo *bi; |
| int i; |
| |
| bi = kzalloc(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_GPL(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_GPL(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_GPL(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 = -EAGAIN; |
| 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; |
| 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:%x\n", ctrl->name, |
| (u32)&ctrl->dev); |
| |
| if (ctrl->nports) { |
| ctrl->ports = kzalloc(ctrl->nports * sizeof(struct slim_port), |
| GFP_KERNEL); |
| if (!ctrl->ports) { |
| ret = -ENOMEM; |
| goto err_port_failed; |
| } |
| } |
| if (ctrl->nchans) { |
| ctrl->chans = kzalloc(ctrl->nchans * sizeof(struct slim_ich), |
| GFP_KERNEL); |
| if (!ctrl->chans) { |
| ret = -ENOMEM; |
| goto err_chan_failed; |
| } |
| |
| ctrl->sched.chc1 = |
| kzalloc(ctrl->nchans * sizeof(struct slim_ich *), |
| GFP_KERNEL); |
| if (!ctrl->sched.chc1) { |
| kfree(ctrl->chans); |
| ret = -ENOMEM; |
| goto err_chan_failed; |
| } |
| ctrl->sched.chc3 = |
| kzalloc(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) |
| { |
| device_unregister(&sbdev->dev); |
| } |
| EXPORT_SYMBOL_GPL(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_GPL(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; |
| int status; |
| |
| if (ctrl->nr & ~MAX_ID_MASK) |
| return -EINVAL; |
| |
| retry: |
| if (idr_pre_get(&ctrl_idr, GFP_KERNEL) == 0) |
| return -ENOMEM; |
| |
| mutex_lock(&slim_lock); |
| status = idr_get_new_above(&ctrl_idr, ctrl, ctrl->nr, &id); |
| if (status == 0 && id != ctrl->nr) { |
| status = -EAGAIN; |
| idr_remove(&ctrl_idr, id); |
| } |
| mutex_unlock(&slim_lock); |
| if (status == -EAGAIN) |
| goto retry; |
| |
| if (status == 0) |
| status = slim_register_controller(ctrl); |
| return status; |
| } |
| EXPORT_SYMBOL_GPL(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); |
| |
| /* |
| * 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; |
| if (!ctrl) |
| return; |
| 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; |
| struct slim_msg_txn *txn; |
| |
| mutex_lock(&ctrl->m_ctrl); |
| txn = ctrl->txnt[tid]; |
| if (txn == NULL || txn->rbuf == NULL) { |
| 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"); |
| mutex_unlock(&ctrl->m_ctrl); |
| return; |
| } |
| for (i = 0; i < len; i++) |
| txn->rbuf[i] = reply[i]; |
| if (txn->comp) |
| complete(txn->comp); |
| ctrl->txnt[tid] = NULL; |
| mutex_unlock(&ctrl->m_ctrl); |
| kfree(txn); |
| } |
| EXPORT_SYMBOL_GPL(slim_msg_response); |
| |
| static int slim_processtxn(struct slim_controller *ctrl, u8 dt, u16 mc, u16 ec, |
| u8 mt, u8 *rbuf, const u8 *wbuf, u8 len, u8 mlen, |
| struct completion *comp, u8 la, u8 *tid) |
| { |
| u8 i = 0; |
| int ret = 0; |
| struct slim_msg_txn *txn = kmalloc(sizeof(struct slim_msg_txn), |
| GFP_KERNEL); |
| if (!txn) |
| return -ENOMEM; |
| if (tid) { |
| mutex_lock(&ctrl->m_ctrl); |
| for (i = 0; i < ctrl->last_tid; i++) { |
| if (ctrl->txnt[i] == NULL) |
| break; |
| } |
| if (i >= ctrl->last_tid) { |
| if (ctrl->last_tid == 255) { |
| mutex_unlock(&ctrl->m_ctrl); |
| kfree(txn); |
| return -ENOMEM; |
| } |
| ctrl->txnt = krealloc(ctrl->txnt, |
| (i + 1) * sizeof(struct slim_msg_txn *), |
| GFP_KERNEL); |
| if (!ctrl->txnt) { |
| mutex_unlock(&ctrl->m_ctrl); |
| kfree(txn); |
| return -ENOMEM; |
| } |
| ctrl->last_tid++; |
| } |
| ctrl->txnt[i] = txn; |
| mutex_unlock(&ctrl->m_ctrl); |
| txn->tid = i; |
| *tid = i; |
| } |
| txn->mc = mc; |
| txn->mt = mt; |
| txn->dt = dt; |
| txn->ec = ec; |
| txn->la = la; |
| txn->rbuf = rbuf; |
| txn->wbuf = wbuf; |
| txn->rl = mlen; |
| txn->len = len; |
| txn->comp = comp; |
| |
| ret = ctrl->xfer_msg(ctrl, txn); |
| if (!tid) |
| kfree(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; |
| |
| 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) { |
| ctrl->addrt = krealloc(ctrl->addrt, |
| (ctrl->num_dev + 1) * |
| sizeof(struct slim_addrt), |
| GFP_KERNEL); |
| if (!ctrl->addrt) { |
| ret = -ENOMEM; |
| goto ret_assigned_laddr; |
| } |
| 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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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); |
| int ret; |
| u16 sl, cur; |
| u16 ec; |
| u8 tid, mlen = 6; |
| |
| 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); |
| ec = ((sl | (1 << 3)) | ((msg->start_offset & 0xFFF) << 4)); |
| |
| if (wbuf) |
| mlen += len; |
| if (rbuf) { |
| mlen++; |
| if (!msg->comp) |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_LOGICALADDR, |
| mc, ec, SLIM_MSG_MT_CORE, rbuf, wbuf, len, mlen, |
| &complete, sbdev->laddr, &tid); |
| else |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_LOGICALADDR, |
| mc, ec, SLIM_MSG_MT_CORE, rbuf, wbuf, len, mlen, |
| msg->comp, sbdev->laddr, &tid); |
| /* sync read */ |
| if (!ret && !msg->comp) { |
| ret = wait_for_completion_timeout(&complete, HZ); |
| if (!ret) { |
| struct slim_msg_txn *txn; |
| dev_err(&ctrl->dev, "slimbus Read timed out"); |
| mutex_lock(&ctrl->m_ctrl); |
| txn = ctrl->txnt[tid]; |
| /* Invalidate the transaction */ |
| ctrl->txnt[tid] = NULL; |
| mutex_unlock(&ctrl->m_ctrl); |
| kfree(txn); |
| ret = -ETIMEDOUT; |
| } else |
| ret = 0; |
| } else if (ret < 0 && !msg->comp) { |
| struct slim_msg_txn *txn; |
| dev_err(&ctrl->dev, "slimbus Read error"); |
| mutex_lock(&ctrl->m_ctrl); |
| txn = ctrl->txnt[tid]; |
| /* Invalidate the transaction */ |
| ctrl->txnt[tid] = NULL; |
| mutex_unlock(&ctrl->m_ctrl); |
| kfree(txn); |
| } |
| |
| } else |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_LOGICALADDR, mc, ec, |
| SLIM_MSG_MT_CORE, rbuf, wbuf, len, mlen, |
| NULL, sbdev->laddr, NULL); |
| xfer_err: |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(slim_xfer_msg); |
| |
| /* |
| * 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_GPL(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_GPL(slim_dealloc_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_GPL(slim_get_slaveport); |
| |
| static int connect_port_ch(struct slim_controller *ctrl, u8 ch, u32 ph, |
| enum slim_port_flow flow) |
| { |
| int ret; |
| u16 mc; |
| u8 buf[2]; |
| u32 la = SLIM_HDL_TO_LA(ph); |
| u8 pn = (u8)SLIM_HDL_TO_PORT(ph); |
| |
| if (flow == SLIM_SRC) |
| mc = SLIM_MSG_MC_CONNECT_SOURCE; |
| else |
| 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, SLIM_MSG_DEST_LOGICALADDR, mc, 0, |
| SLIM_MSG_MT_CORE, NULL, buf, 2, 6, NULL, la, |
| NULL); |
| 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; |
| u16 mc; |
| u32 la = SLIM_HDL_TO_LA(ph); |
| u8 pn = (u8)SLIM_HDL_TO_PORT(ph); |
| |
| mc = SLIM_MSG_MC_DISCONNECT_PORT; |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_LOGICALADDR, mc, 0, |
| SLIM_MSG_MT_CORE, NULL, &pn, 1, 5, |
| NULL, la, NULL); |
| if (ret) |
| return ret; |
| if (la == SLIM_LA_MANAGER) |
| ctrl->ports[pn].state = SLIM_P_UNCFG; |
| 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); |
| |
| /* 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) { |
| u8 pn = SLIM_HDL_TO_PORT(srch); |
| 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; |
| } |
| |
| 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_GPL(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]; |
| |
| 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 |
| 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; |
| } |
| } |
| |
| slc->sinkh = krealloc(slc->sinkh, (sizeof(u32) * (slc->nsink + nsink)), |
| GFP_KERNEL); |
| if (!slc->sinkh) { |
| ret = -ENOMEM; |
| for (j = 0; j < nsink; j++) |
| disconnect_port_ch(ctrl, sinkh[j]); |
| goto connect_sink_err; |
| } |
| |
| 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_GPL(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_GPL(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, u8 *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_GPL(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, |
| u8 **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 = NULL; |
| 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_GPL(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; |
| |
| return; |
| } |
| |
| 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->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; |
| } |
| |
| ph = slc->srch; |
| la = SLIM_HDL_TO_LA(ph); |
| if (la == SLIM_LA_MANAGER) |
| ctrl->ports[SLIM_HDL_TO_PORT(ph)].state = SLIM_P_UNCFG; |
| |
| 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_PUSH) |
| 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 { |
| /* Push-Pull not supported for now */ |
| return -EPROTONOSUPPORT; |
| } |
| } |
| 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_GPL(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_GPL(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_GPL(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_GPL(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_GPL(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 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; |
| |
| 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 */ |
| |
| 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]; |
| } |
| } |
| /* 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) { |
| if (((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 { |
| 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; |
| |
| 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, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_BEGIN_RECONFIGURATION, 0, SLIM_MSG_MT_CORE, |
| NULL, NULL, 0, 3, NULL, 0, NULL); |
| dev_dbg(&ctrl->dev, "sending begin_reconfig:ret:%d\n", ret); |
| } |
| |
| if (!ret && subframe != ctrl->sched.subfrmcode) { |
| wbuf[0] = (u8)(subframe & 0xFF); |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_NEXT_SUBFRAME_MODE, 0, SLIM_MSG_MT_CORE, |
| NULL, (u8 *)&subframe, 1, 4, NULL, 0, NULL); |
| dev_dbg(&ctrl->dev, "sending subframe:%d,ret:%d\n", |
| (int)wbuf[0], ret); |
| } |
| if (!ret && clkgear != ctrl->clkgear) { |
| wbuf[0] = (u8)(clkgear & 0xFF); |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_NEXT_CLOCK_GEAR, 0, SLIM_MSG_MT_CORE, |
| NULL, wbuf, 1, 4, NULL, 0, NULL); |
| 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; |
| 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, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_NEXT_DEFINE_CONTENT, 0, |
| SLIM_MSG_MT_CORE, NULL, (u8 *)&wbuf, 4, 7, |
| NULL, 0, NULL); |
| if (ret) |
| goto revert_reconfig; |
| |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_NEXT_ACTIVATE_CHANNEL, 0, |
| SLIM_MSG_MT_CORE, NULL, (u8 *)&wbuf, 1, 4, |
| NULL, 0, NULL); |
| 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; |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_NEXT_REMOVE_CHANNEL, 0, |
| SLIM_MSG_MT_CORE, NULL, wbuf, 1, 4, |
| NULL, 0, NULL); |
| 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; |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_NEXT_DEACTIVATE_CHANNEL, 0, |
| SLIM_MSG_MT_CORE, NULL, wbuf, 1, 4, |
| NULL, 0, NULL); |
| 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; |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_NEXT_DEFINE_CHANNEL, 0, |
| SLIM_MSG_MT_CORE, NULL, (u8 *)wbuf, 4, |
| 7, NULL, 0, NULL); |
| 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); |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_NEXT_DEFINE_CHANNEL, 0, |
| SLIM_MSG_MT_CORE, NULL, (u8 *)wbuf, 4, |
| 7, NULL, 0, NULL); |
| if (ret) |
| goto revert_reconfig; |
| } |
| } |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_MC_RECONFIGURE_NOW, 0, SLIM_MSG_MT_CORE, NULL, |
| NULL, 0, 3, NULL, 0, NULL); |
| 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_GPL(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); |
| 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)); |
| if (!ret && commit == true) |
| ret = slim_reconfigure_now(sb); |
| mutex_unlock(&sb->sldev_reconf); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(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_GPL(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; |
| |
| 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; |
| } else { |
| 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; |
| break; |
| } 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, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_CLK_PAUSE_SEQ_FLG | SLIM_MSG_MC_BEGIN_RECONFIGURATION, |
| 0, SLIM_MSG_MT_CORE, NULL, NULL, 0, 3, NULL, 0, NULL); |
| if (ret) |
| goto clk_pause_ret; |
| |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_CLK_PAUSE_SEQ_FLG | SLIM_MSG_MC_NEXT_PAUSE_CLOCK, 0, |
| SLIM_MSG_MT_CORE, NULL, &restart, 1, 4, NULL, 0, NULL); |
| if (ret) |
| goto clk_pause_ret; |
| |
| ret = slim_processtxn(ctrl, SLIM_MSG_DEST_BROADCAST, |
| SLIM_MSG_CLK_PAUSE_SEQ_FLG | SLIM_MSG_MC_RECONFIGURE_NOW, 0, |
| SLIM_MSG_MT_CORE, NULL, NULL, 0, 3, NULL, 0, NULL); |
| 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_GPL(slim_ctrl_clk_pause); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_VERSION("0.1"); |
| MODULE_DESCRIPTION("Slimbus module"); |
| MODULE_ALIAS("platform:slimbus"); |