1 // SPDX-License-Identifier: GPL-2.0-only
3 * omap_device implementation
5 * Copyright (C) 2009-2010 Nokia Corporation
6 * Paul Walmsley, Kevin Hilman
8 * Developed in collaboration with (alphabetical order): Benoit
9 * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
10 * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
13 * This code provides a consistent interface for OMAP device drivers
14 * to control power management and interconnect properties of their
17 * In the medium- to long-term, this code should be implemented as a
18 * proper omap_bus/omap_device in Linux, no more platform_data func
23 #include <linux/kernel.h>
24 #include <linux/platform_device.h>
25 #include <linux/slab.h>
26 #include <linux/err.h>
28 #include <linux/clk.h>
29 #include <linux/clkdev.h>
30 #include <linux/pm_domain.h>
31 #include <linux/pm_runtime.h>
33 #include <linux/of_address.h>
34 #include <linux/of_irq.h>
35 #include <linux/notifier.h>
39 #include "omap_device.h"
40 #include "omap_hwmod.h"
42 static struct omap_device *omap_device_alloc(struct platform_device *pdev,
43 struct omap_hwmod **ohs, int oh_cnt);
44 static void omap_device_delete(struct omap_device *od);
45 static struct dev_pm_domain omap_device_fail_pm_domain;
46 static struct dev_pm_domain omap_device_pm_domain;
48 /* Private functions */
50 static void _add_clkdev(struct omap_device *od, const char *clk_alias,
56 if (!clk_alias || !clk_name)
59 dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
61 r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
63 dev_dbg(&od->pdev->dev,
64 "alias %s already exists\n", clk_alias);
69 r = clk_get_sys(NULL, clk_name);
72 struct of_phandle_args clkspec;
74 clkspec.np = of_find_node_by_name(NULL, clk_name);
76 r = of_clk_get_from_provider(&clkspec);
78 rc = clk_register_clkdev(r, clk_alias,
79 dev_name(&od->pdev->dev));
81 rc = clk_add_alias(clk_alias, dev_name(&od->pdev->dev),
86 if (rc == -ENODEV || rc == -ENOMEM)
87 dev_err(&od->pdev->dev,
88 "clkdev_alloc for %s failed\n", clk_alias);
90 dev_err(&od->pdev->dev,
91 "clk_get for %s failed\n", clk_name);
96 * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
98 * @od: struct omap_device *od
99 * @oh: struct omap_hwmod *oh
101 * For the main clock and every optional clock present per hwmod per
102 * omap_device, this function adds an entry in the clkdev table of the
103 * form <dev-id=dev_name, con-id=role> if it does not exist already.
105 * This allows drivers to get a pointer to its optional clocks based on its role
106 * by calling clk_get(<dev*>, <role>).
107 * In the case of the main clock, a "fck" alias is used.
111 static void _add_hwmod_clocks_clkdev(struct omap_device *od,
112 struct omap_hwmod *oh)
116 _add_clkdev(od, "fck", oh->main_clk);
118 for (i = 0; i < oh->opt_clks_cnt; i++)
119 _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
124 * omap_device_build_from_dt - build an omap_device with multiple hwmods
125 * @pdev: The platform device to update.
127 * Function for building an omap_device already registered from device-tree
129 * Returns 0 or PTR_ERR() on error.
131 static int omap_device_build_from_dt(struct platform_device *pdev)
133 struct omap_hwmod **hwmods;
134 struct omap_device *od;
135 struct omap_hwmod *oh;
136 struct device_node *node = pdev->dev.of_node;
139 int oh_cnt, i, ret = 0;
140 bool device_active = false, skip_pm_domain = false;
142 oh_cnt = of_property_count_strings(node, "ti,hwmods");
144 dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
148 /* SDMA still needs special handling for omap_device_build() */
149 ret = of_property_read_string_index(node, "ti,hwmods", 0, &oh_name);
150 if (!ret && (!strncmp("dma_system", oh_name, 10) ||
151 !strncmp("dma", oh_name, 3)))
152 skip_pm_domain = true;
154 /* Use ti-sysc driver instead of omap_device? */
155 if (!skip_pm_domain &&
156 !omap_hwmod_parse_module_range(NULL, node, &res))
159 hwmods = kcalloc(oh_cnt, sizeof(struct omap_hwmod *), GFP_KERNEL);
165 for (i = 0; i < oh_cnt; i++) {
166 of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
167 oh = omap_hwmod_lookup(oh_name);
169 dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
175 if (oh->flags & HWMOD_INIT_NO_IDLE)
176 device_active = true;
179 od = omap_device_alloc(pdev, hwmods, oh_cnt);
181 dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
187 /* Fix up missing resource names */
188 for (i = 0; i < pdev->num_resources; i++) {
189 struct resource *r = &pdev->resource[i];
192 r->name = dev_name(&pdev->dev);
195 if (!skip_pm_domain) {
196 dev_pm_domain_set(&pdev->dev, &omap_device_pm_domain);
198 omap_device_enable(pdev);
199 pm_runtime_set_active(&pdev->dev);
206 /* if data/we are at fault.. load up a fail handler */
208 dev_pm_domain_set(&pdev->dev, &omap_device_fail_pm_domain);
213 static int _omap_device_notifier_call(struct notifier_block *nb,
214 unsigned long event, void *dev)
216 struct platform_device *pdev = to_platform_device(dev);
217 struct omap_device *od;
221 case BUS_NOTIFY_REMOVED_DEVICE:
222 if (pdev->archdata.od)
223 omap_device_delete(pdev->archdata.od);
225 case BUS_NOTIFY_UNBOUND_DRIVER:
226 od = to_omap_device(pdev);
227 if (od && (od->_state == OMAP_DEVICE_STATE_ENABLED)) {
228 dev_info(dev, "enabled after unload, idling\n");
229 err = omap_device_idle(pdev);
231 dev_err(dev, "failed to idle\n");
234 case BUS_NOTIFY_BIND_DRIVER:
235 od = to_omap_device(pdev);
237 od->_driver_status = BUS_NOTIFY_BIND_DRIVER;
238 if (od->_state == OMAP_DEVICE_STATE_ENABLED &&
239 pm_runtime_status_suspended(dev)) {
240 pm_runtime_set_active(dev);
244 case BUS_NOTIFY_ADD_DEVICE:
245 if (pdev->dev.of_node)
246 omap_device_build_from_dt(pdev);
249 od = to_omap_device(pdev);
251 od->_driver_status = event;
258 * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
259 * @od: struct omap_device *od
261 * Enable all underlying hwmods. Returns 0.
263 static int _omap_device_enable_hwmods(struct omap_device *od)
268 for (i = 0; i < od->hwmods_cnt; i++)
269 ret |= omap_hwmod_enable(od->hwmods[i]);
275 * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
276 * @od: struct omap_device *od
278 * Idle all underlying hwmods. Returns 0.
280 static int _omap_device_idle_hwmods(struct omap_device *od)
285 for (i = 0; i < od->hwmods_cnt; i++)
286 ret |= omap_hwmod_idle(od->hwmods[i]);
291 /* Public functions for use by core code */
294 * omap_device_alloc - allocate an omap_device
295 * @pdev: platform_device that will be included in this omap_device
296 * @ohs: ptr to the omap_hwmod for this omap_device
297 * @oh_cnt: the size of the ohs list
299 * Convenience function for allocating an omap_device structure and filling
300 * hwmods, and resources.
302 * Returns an struct omap_device pointer or ERR_PTR() on error;
304 static struct omap_device *omap_device_alloc(struct platform_device *pdev,
305 struct omap_hwmod **ohs, int oh_cnt)
308 struct omap_device *od;
310 struct omap_hwmod **hwmods;
312 od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
316 od->hwmods_cnt = oh_cnt;
318 hwmods = kmemdup_array(ohs, oh_cnt, sizeof(*hwmods), GFP_KERNEL);
324 pdev->archdata.od = od;
326 for (i = 0; i < oh_cnt; i++) {
328 _add_hwmod_clocks_clkdev(od, hwmods[i]);
336 dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
341 static void omap_device_delete(struct omap_device *od)
346 od->pdev->archdata.od = NULL;
352 static int _od_runtime_suspend(struct device *dev)
354 struct platform_device *pdev = to_platform_device(dev);
357 ret = pm_generic_runtime_suspend(dev);
361 return omap_device_idle(pdev);
364 static int _od_runtime_resume(struct device *dev)
366 struct platform_device *pdev = to_platform_device(dev);
369 ret = omap_device_enable(pdev);
371 dev_err(dev, "use pm_runtime_put_sync_suspend() in driver?\n");
375 return pm_generic_runtime_resume(dev);
378 static int _od_fail_runtime_suspend(struct device *dev)
380 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
384 static int _od_fail_runtime_resume(struct device *dev)
386 dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
392 #ifdef CONFIG_SUSPEND
393 static int _od_suspend_noirq(struct device *dev)
395 struct platform_device *pdev = to_platform_device(dev);
396 struct omap_device *od = to_omap_device(pdev);
399 /* Don't attempt late suspend on a driver that is not bound */
400 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
403 ret = pm_generic_suspend_noirq(dev);
405 if (!ret && !pm_runtime_status_suspended(dev)) {
406 if (pm_generic_runtime_suspend(dev) == 0) {
407 omap_device_idle(pdev);
408 od->flags |= OMAP_DEVICE_SUSPENDED;
415 static int _od_resume_noirq(struct device *dev)
417 struct platform_device *pdev = to_platform_device(dev);
418 struct omap_device *od = to_omap_device(pdev);
420 if (od->flags & OMAP_DEVICE_SUSPENDED) {
421 od->flags &= ~OMAP_DEVICE_SUSPENDED;
422 omap_device_enable(pdev);
423 pm_generic_runtime_resume(dev);
426 return pm_generic_resume_noirq(dev);
429 #define _od_suspend_noirq NULL
430 #define _od_resume_noirq NULL
433 static struct dev_pm_domain omap_device_fail_pm_domain = {
435 SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
436 _od_fail_runtime_resume, NULL)
440 static struct dev_pm_domain omap_device_pm_domain = {
442 SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
444 USE_PLATFORM_PM_SLEEP_OPS
445 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq,
450 /* Public functions for use by device drivers through struct platform_data */
453 * omap_device_enable - fully activate an omap_device
454 * @pdev: the platform device to activate
456 * Do whatever is necessary for the hwmods underlying omap_device @od
457 * to be accessible and ready to operate. This generally involves
458 * enabling clocks, setting SYSCONFIG registers; and in the future may
459 * involve remuxing pins. Device drivers should call this function
460 * indirectly via pm_runtime_get*(). Returns -EINVAL if called when
461 * the omap_device is already enabled, or passes along the return
462 * value of _omap_device_enable_hwmods().
464 int omap_device_enable(struct platform_device *pdev)
467 struct omap_device *od;
469 od = to_omap_device(pdev);
471 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
473 "omap_device: %s() called from invalid state %d\n",
474 __func__, od->_state);
478 ret = _omap_device_enable_hwmods(od);
481 od->_state = OMAP_DEVICE_STATE_ENABLED;
487 * omap_device_idle - idle an omap_device
488 * @pdev: The platform_device (omap_device) to idle
490 * Idle omap_device @od. Device drivers call this function indirectly
491 * via pm_runtime_put*(). Returns -EINVAL if the omap_device is not
492 * currently enabled, or passes along the return value of
493 * _omap_device_idle_hwmods().
495 int omap_device_idle(struct platform_device *pdev)
498 struct omap_device *od;
500 od = to_omap_device(pdev);
502 if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
504 "omap_device: %s() called from invalid state %d\n",
505 __func__, od->_state);
509 ret = _omap_device_idle_hwmods(od);
512 od->_state = OMAP_DEVICE_STATE_IDLE;
518 * omap_device_assert_hardreset - set a device's hardreset line
519 * @pdev: struct platform_device * to reset
520 * @name: const char * name of the reset line
522 * Set the hardreset line identified by @name on the IP blocks
523 * associated with the hwmods backing the platform_device @pdev. All
524 * of the hwmods associated with @pdev must have the same hardreset
525 * line linked to them for this to work. Passes along the return value
526 * of omap_hwmod_assert_hardreset() in the event of any failure, or
527 * returns 0 upon success.
529 int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
531 struct omap_device *od = to_omap_device(pdev);
535 for (i = 0; i < od->hwmods_cnt; i++) {
536 ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
545 * omap_device_deassert_hardreset - release a device's hardreset line
546 * @pdev: struct platform_device * to reset
547 * @name: const char * name of the reset line
549 * Release the hardreset line identified by @name on the IP blocks
550 * associated with the hwmods backing the platform_device @pdev. All
551 * of the hwmods associated with @pdev must have the same hardreset
552 * line linked to them for this to work. Passes along the return
553 * value of omap_hwmod_deassert_hardreset() in the event of any
554 * failure, or returns 0 upon success.
556 int omap_device_deassert_hardreset(struct platform_device *pdev,
559 struct omap_device *od = to_omap_device(pdev);
563 for (i = 0; i < od->hwmods_cnt; i++) {
564 ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
572 static struct notifier_block platform_nb = {
573 .notifier_call = _omap_device_notifier_call,
576 static int __init omap_device_init(void)
578 bus_register_notifier(&platform_bus_type, &platform_nb);
581 omap_postcore_initcall(omap_device_init);
584 * omap_device_late_idle - idle devices without drivers
585 * @dev: struct device * associated with omap_device
588 * Check the driver bound status of this device, and idle it
589 * if there is no driver attached.
591 static int __init omap_device_late_idle(struct device *dev, void *data)
593 struct platform_device *pdev = to_platform_device(dev);
594 struct omap_device *od = to_omap_device(pdev);
601 * If omap_device state is enabled, but has no driver bound,
606 * Some devices (like memory controllers) are always kept
607 * enabled, and should not be idled even with no drivers.
609 for (i = 0; i < od->hwmods_cnt; i++)
610 if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
613 if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER &&
614 od->_driver_status != BUS_NOTIFY_BIND_DRIVER) {
615 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
616 dev_warn(dev, "%s: enabled but no driver. Idling\n",
618 omap_device_idle(pdev);
625 static int __init omap_device_late_init(void)
627 bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
631 omap_late_initcall_sync(omap_device_late_init);