diff options
Diffstat (limited to 'kernel/arch/arm/mach-omap2/omap_device.c')
| -rw-r--r-- | kernel/arch/arm/mach-omap2/omap_device.c | 929 |
1 files changed, 929 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-omap2/omap_device.c b/kernel/arch/arm/mach-omap2/omap_device.c new file mode 100644 index 000000000..166b18f51 --- /dev/null +++ b/kernel/arch/arm/mach-omap2/omap_device.c @@ -0,0 +1,929 @@ +/* + * omap_device implementation + * + * Copyright (C) 2009-2010 Nokia Corporation + * Paul Walmsley, Kevin Hilman + * + * Developed in collaboration with (alphabetical order): Benoit + * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram + * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard + * Woodruff + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This code provides a consistent interface for OMAP device drivers + * to control power management and interconnect properties of their + * devices. + * + * In the medium- to long-term, this code should be implemented as a + * proper omap_bus/omap_device in Linux, no more platform_data func + * pointers + * + * + */ +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/clkdev.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/notifier.h> + +#include "common.h" +#include "soc.h" +#include "omap_device.h" +#include "omap_hwmod.h" + +/* Private functions */ + +static void _add_clkdev(struct omap_device *od, const char *clk_alias, + const char *clk_name) +{ + struct clk *r; + struct clk_lookup *l; + + if (!clk_alias || !clk_name) + return; + + dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name); + + r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias); + if (!IS_ERR(r)) { + dev_dbg(&od->pdev->dev, + "alias %s already exists\n", clk_alias); + clk_put(r); + return; + } + + r = clk_get(NULL, clk_name); + if (IS_ERR(r)) { + dev_err(&od->pdev->dev, + "clk_get for %s failed\n", clk_name); + return; + } + + l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev)); + if (!l) { + dev_err(&od->pdev->dev, + "clkdev_alloc for %s failed\n", clk_alias); + return; + } + + clkdev_add(l); +} + +/** + * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks + * and main clock + * @od: struct omap_device *od + * @oh: struct omap_hwmod *oh + * + * For the main clock and every optional clock present per hwmod per + * omap_device, this function adds an entry in the clkdev table of the + * form <dev-id=dev_name, con-id=role> if it does not exist already. + * + * The function is called from inside omap_device_build_ss(), after + * omap_device_register. + * + * This allows drivers to get a pointer to its optional clocks based on its role + * by calling clk_get(<dev*>, <role>). + * In the case of the main clock, a "fck" alias is used. + * + * No return value. + */ +static void _add_hwmod_clocks_clkdev(struct omap_device *od, + struct omap_hwmod *oh) +{ + int i; + + _add_clkdev(od, "fck", oh->main_clk); + + for (i = 0; i < oh->opt_clks_cnt; i++) + _add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk); +} + + +/** + * omap_device_build_from_dt - build an omap_device with multiple hwmods + * @pdev_name: name of the platform_device driver to use + * @pdev_id: this platform_device's connection ID + * @oh: ptr to the single omap_hwmod that backs this omap_device + * @pdata: platform_data ptr to associate with the platform_device + * @pdata_len: amount of memory pointed to by @pdata + * + * Function for building an omap_device already registered from device-tree + * + * Returns 0 or PTR_ERR() on error. + */ +static int omap_device_build_from_dt(struct platform_device *pdev) +{ + struct omap_hwmod **hwmods; + struct omap_device *od; + struct omap_hwmod *oh; + struct device_node *node = pdev->dev.of_node; + const char *oh_name; + int oh_cnt, i, ret = 0; + bool device_active = false; + + oh_cnt = of_property_count_strings(node, "ti,hwmods"); + if (oh_cnt <= 0) { + dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n"); + return -ENODEV; + } + + hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL); + if (!hwmods) { + ret = -ENOMEM; + goto odbfd_exit; + } + + for (i = 0; i < oh_cnt; i++) { + of_property_read_string_index(node, "ti,hwmods", i, &oh_name); + oh = omap_hwmod_lookup(oh_name); + if (!oh) { + dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n", + oh_name); + ret = -EINVAL; + goto odbfd_exit1; + } + hwmods[i] = oh; + if (oh->flags & HWMOD_INIT_NO_IDLE) + device_active = true; + } + + od = omap_device_alloc(pdev, hwmods, oh_cnt); + if (IS_ERR(od)) { + dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n", + oh_name); + ret = PTR_ERR(od); + goto odbfd_exit1; + } + + /* Fix up missing resource names */ + for (i = 0; i < pdev->num_resources; i++) { + struct resource *r = &pdev->resource[i]; + + if (r->name == NULL) + r->name = dev_name(&pdev->dev); + } + + pdev->dev.pm_domain = &omap_device_pm_domain; + + if (device_active) { + omap_device_enable(pdev); + pm_runtime_set_active(&pdev->dev); + } + +odbfd_exit1: + kfree(hwmods); +odbfd_exit: + /* if data/we are at fault.. load up a fail handler */ + if (ret) + pdev->dev.pm_domain = &omap_device_fail_pm_domain; + + return ret; +} + +static int _omap_device_notifier_call(struct notifier_block *nb, + unsigned long event, void *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct omap_device *od; + + switch (event) { + case BUS_NOTIFY_DEL_DEVICE: + if (pdev->archdata.od) + omap_device_delete(pdev->archdata.od); + break; + case BUS_NOTIFY_ADD_DEVICE: + if (pdev->dev.of_node) + omap_device_build_from_dt(pdev); + omap_auxdata_legacy_init(dev); + /* fall through */ + default: + od = to_omap_device(pdev); + if (od) + od->_driver_status = event; + } + + return NOTIFY_DONE; +} + +/** + * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods + * @od: struct omap_device *od + * + * Enable all underlying hwmods. Returns 0. + */ +static int _omap_device_enable_hwmods(struct omap_device *od) +{ + int i; + + for (i = 0; i < od->hwmods_cnt; i++) + omap_hwmod_enable(od->hwmods[i]); + + /* XXX pass along return value here? */ + return 0; +} + +/** + * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods + * @od: struct omap_device *od + * + * Idle all underlying hwmods. Returns 0. + */ +static int _omap_device_idle_hwmods(struct omap_device *od) +{ + int i; + + for (i = 0; i < od->hwmods_cnt; i++) + omap_hwmod_idle(od->hwmods[i]); + + /* XXX pass along return value here? */ + return 0; +} + +/* Public functions for use by core code */ + +/** + * omap_device_get_context_loss_count - get lost context count + * @od: struct omap_device * + * + * Using the primary hwmod, query the context loss count for this + * device. + * + * Callers should consider context for this device lost any time this + * function returns a value different than the value the caller got + * the last time it called this function. + * + * If any hwmods exist for the omap_device assoiated with @pdev, + * return the context loss counter for that hwmod, otherwise return + * zero. + */ +int omap_device_get_context_loss_count(struct platform_device *pdev) +{ + struct omap_device *od; + u32 ret = 0; + + od = to_omap_device(pdev); + + if (od->hwmods_cnt) + ret = omap_hwmod_get_context_loss_count(od->hwmods[0]); + + return ret; +} + +/** + * omap_device_count_resources - count number of struct resource entries needed + * @od: struct omap_device * + * @flags: Type of resources to include when counting (IRQ/DMA/MEM) + * + * Count the number of struct resource entries needed for this + * omap_device @od. Used by omap_device_build_ss() to determine how + * much memory to allocate before calling + * omap_device_fill_resources(). Returns the count. + */ +static int omap_device_count_resources(struct omap_device *od, + unsigned long flags) +{ + int c = 0; + int i; + + for (i = 0; i < od->hwmods_cnt; i++) + c += omap_hwmod_count_resources(od->hwmods[i], flags); + + pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n", + od->pdev->name, c, od->hwmods_cnt); + + return c; +} + +/** + * omap_device_fill_resources - fill in array of struct resource + * @od: struct omap_device * + * @res: pointer to an array of struct resource to be filled in + * + * Populate one or more empty struct resource pointed to by @res with + * the resource data for this omap_device @od. Used by + * omap_device_build_ss() after calling omap_device_count_resources(). + * Ideally this function would not be needed at all. If omap_device + * replaces platform_device, then we can specify our own + * get_resource()/ get_irq()/etc functions that use the underlying + * omap_hwmod information. Or if platform_device is extended to use + * subarchitecture-specific function pointers, the various + * platform_device functions can simply call omap_device internal + * functions to get device resources. Hacking around the existing + * platform_device code wastes memory. Returns 0. + */ +static int omap_device_fill_resources(struct omap_device *od, + struct resource *res) +{ + int i, r; + + for (i = 0; i < od->hwmods_cnt; i++) { + r = omap_hwmod_fill_resources(od->hwmods[i], res); + res += r; + } + + return 0; +} + +/** + * _od_fill_dma_resources - fill in array of struct resource with dma resources + * @od: struct omap_device * + * @res: pointer to an array of struct resource to be filled in + * + * Populate one or more empty struct resource pointed to by @res with + * the dma resource data for this omap_device @od. Used by + * omap_device_alloc() after calling omap_device_count_resources(). + * + * Ideally this function would not be needed at all. If we have + * mechanism to get dma resources from DT. + * + * Returns 0. + */ +static int _od_fill_dma_resources(struct omap_device *od, + struct resource *res) +{ + int i, r; + + for (i = 0; i < od->hwmods_cnt; i++) { + r = omap_hwmod_fill_dma_resources(od->hwmods[i], res); + res += r; + } + + return 0; +} + +/** + * omap_device_alloc - allocate an omap_device + * @pdev: platform_device that will be included in this omap_device + * @oh: ptr to the single omap_hwmod that backs this omap_device + * @pdata: platform_data ptr to associate with the platform_device + * @pdata_len: amount of memory pointed to by @pdata + * + * Convenience function for allocating an omap_device structure and filling + * hwmods, and resources. + * + * Returns an struct omap_device pointer or ERR_PTR() on error; + */ +struct omap_device *omap_device_alloc(struct platform_device *pdev, + struct omap_hwmod **ohs, int oh_cnt) +{ + int ret = -ENOMEM; + struct omap_device *od; + struct resource *res = NULL; + int i, res_count; + struct omap_hwmod **hwmods; + + od = kzalloc(sizeof(struct omap_device), GFP_KERNEL); + if (!od) { + ret = -ENOMEM; + goto oda_exit1; + } + od->hwmods_cnt = oh_cnt; + + hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL); + if (!hwmods) + goto oda_exit2; + + od->hwmods = hwmods; + od->pdev = pdev; + + /* + * Non-DT Boot: + * Here, pdev->num_resources = 0, and we should get all the + * resources from hwmod. + * + * DT Boot: + * OF framework will construct the resource structure (currently + * does for MEM & IRQ resource) and we should respect/use these + * resources, killing hwmod dependency. + * If pdev->num_resources > 0, we assume that MEM & IRQ resources + * have been allocated by OF layer already (through DTB). + * As preparation for the future we examine the OF provided resources + * to see if we have DMA resources provided already. In this case + * there is no need to update the resources for the device, we use the + * OF provided ones. + * + * TODO: Once DMA resource is available from OF layer, we should + * kill filling any resources from hwmod. + */ + if (!pdev->num_resources) { + /* Count all resources for the device */ + res_count = omap_device_count_resources(od, IORESOURCE_IRQ | + IORESOURCE_DMA | + IORESOURCE_MEM); + } else { + /* Take a look if we already have DMA resource via DT */ + for (i = 0; i < pdev->num_resources; i++) { + struct resource *r = &pdev->resource[i]; + + /* We have it, no need to touch the resources */ + if (r->flags == IORESOURCE_DMA) + goto have_everything; + } + /* Count only DMA resources for the device */ + res_count = omap_device_count_resources(od, IORESOURCE_DMA); + /* The device has no DMA resource, no need for update */ + if (!res_count) + goto have_everything; + + res_count += pdev->num_resources; + } + + /* Allocate resources memory to account for new resources */ + res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL); + if (!res) + goto oda_exit3; + + if (!pdev->num_resources) { + dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n", + __func__, res_count); + omap_device_fill_resources(od, res); + } else { + dev_dbg(&pdev->dev, + "%s: appending %d DMA resources from hwmod\n", + __func__, res_count - pdev->num_resources); + memcpy(res, pdev->resource, + sizeof(struct resource) * pdev->num_resources); + _od_fill_dma_resources(od, &res[pdev->num_resources]); + } + + ret = platform_device_add_resources(pdev, res, res_count); + kfree(res); + + if (ret) + goto oda_exit3; + +have_everything: + pdev->archdata.od = od; + + for (i = 0; i < oh_cnt; i++) { + hwmods[i]->od = od; + _add_hwmod_clocks_clkdev(od, hwmods[i]); + } + + return od; + +oda_exit3: + kfree(hwmods); +oda_exit2: + kfree(od); +oda_exit1: + dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret); + + return ERR_PTR(ret); +} + +void omap_device_delete(struct omap_device *od) +{ + if (!od) + return; + + od->pdev->archdata.od = NULL; + kfree(od->hwmods); + kfree(od); +} + +/** + * omap_device_build - build and register an omap_device with one omap_hwmod + * @pdev_name: name of the platform_device driver to use + * @pdev_id: this platform_device's connection ID + * @oh: ptr to the single omap_hwmod that backs this omap_device + * @pdata: platform_data ptr to associate with the platform_device + * @pdata_len: amount of memory pointed to by @pdata + * + * Convenience function for building and registering a single + * omap_device record, which in turn builds and registers a + * platform_device record. See omap_device_build_ss() for more + * information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise, + * passes along the return value of omap_device_build_ss(). + */ +struct platform_device __init *omap_device_build(const char *pdev_name, + int pdev_id, + struct omap_hwmod *oh, + void *pdata, int pdata_len) +{ + struct omap_hwmod *ohs[] = { oh }; + + if (!oh) + return ERR_PTR(-EINVAL); + + return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata, + pdata_len); +} + +/** + * omap_device_build_ss - build and register an omap_device with multiple hwmods + * @pdev_name: name of the platform_device driver to use + * @pdev_id: this platform_device's connection ID + * @oh: ptr to the single omap_hwmod that backs this omap_device + * @pdata: platform_data ptr to associate with the platform_device + * @pdata_len: amount of memory pointed to by @pdata + * + * Convenience function for building and registering an omap_device + * subsystem record. Subsystem records consist of multiple + * omap_hwmods. This function in turn builds and registers a + * platform_device record. Returns an ERR_PTR() on error, or passes + * along the return value of omap_device_register(). + */ +struct platform_device __init *omap_device_build_ss(const char *pdev_name, + int pdev_id, + struct omap_hwmod **ohs, + int oh_cnt, void *pdata, + int pdata_len) +{ + int ret = -ENOMEM; + struct platform_device *pdev; + struct omap_device *od; + + if (!ohs || oh_cnt == 0 || !pdev_name) + return ERR_PTR(-EINVAL); + + if (!pdata && pdata_len > 0) + return ERR_PTR(-EINVAL); + + pdev = platform_device_alloc(pdev_name, pdev_id); + if (!pdev) { + ret = -ENOMEM; + goto odbs_exit; + } + + /* Set the dev_name early to allow dev_xxx in omap_device_alloc */ + if (pdev->id != -1) + dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); + else + dev_set_name(&pdev->dev, "%s", pdev->name); + + od = omap_device_alloc(pdev, ohs, oh_cnt); + if (IS_ERR(od)) + goto odbs_exit1; + + ret = platform_device_add_data(pdev, pdata, pdata_len); + if (ret) + goto odbs_exit2; + + ret = omap_device_register(pdev); + if (ret) + goto odbs_exit2; + + return pdev; + +odbs_exit2: + omap_device_delete(od); +odbs_exit1: + platform_device_put(pdev); +odbs_exit: + + pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret); + + return ERR_PTR(ret); +} + +#ifdef CONFIG_PM +static int _od_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + int ret; + + ret = pm_generic_runtime_suspend(dev); + + if (!ret) + omap_device_idle(pdev); + + return ret; +} + +static int _od_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + + omap_device_enable(pdev); + + return pm_generic_runtime_resume(dev); +} + +static int _od_fail_runtime_suspend(struct device *dev) +{ + dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__); + return -ENODEV; +} + +static int _od_fail_runtime_resume(struct device *dev) +{ + dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__); + return -ENODEV; +} + +#endif + +#ifdef CONFIG_SUSPEND +static int _od_suspend_noirq(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct omap_device *od = to_omap_device(pdev); + int ret; + + /* Don't attempt late suspend on a driver that is not bound */ + if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) + return 0; + + ret = pm_generic_suspend_noirq(dev); + + if (!ret && !pm_runtime_status_suspended(dev)) { + if (pm_generic_runtime_suspend(dev) == 0) { + pm_runtime_set_suspended(dev); + omap_device_idle(pdev); + od->flags |= OMAP_DEVICE_SUSPENDED; + } + } + + return ret; +} + +static int _od_resume_noirq(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct omap_device *od = to_omap_device(pdev); + + if (od->flags & OMAP_DEVICE_SUSPENDED) { + od->flags &= ~OMAP_DEVICE_SUSPENDED; + omap_device_enable(pdev); + /* + * XXX: we run before core runtime pm has resumed itself. At + * this point in time, we just restore the runtime pm state and + * considering symmetric operations in resume, we donot expect + * to fail. If we failed, something changed in core runtime_pm + * framework OR some device driver messed things up, hence, WARN + */ + WARN(pm_runtime_set_active(dev), + "Could not set %s runtime state active\n", dev_name(dev)); + pm_generic_runtime_resume(dev); + } + + return pm_generic_resume_noirq(dev); +} +#else +#define _od_suspend_noirq NULL +#define _od_resume_noirq NULL +#endif + +struct dev_pm_domain omap_device_fail_pm_domain = { + .ops = { + SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend, + _od_fail_runtime_resume, NULL) + } +}; + +struct dev_pm_domain omap_device_pm_domain = { + .ops = { + SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume, + NULL) + USE_PLATFORM_PM_SLEEP_OPS + .suspend_noirq = _od_suspend_noirq, + .resume_noirq = _od_resume_noirq, + .freeze_noirq = _od_suspend_noirq, + .thaw_noirq = _od_resume_noirq, + .restore_noirq = _od_resume_noirq, + } +}; + +/** + * omap_device_register - register an omap_device with one omap_hwmod + * @od: struct omap_device * to register + * + * Register the omap_device structure. This currently just calls + * platform_device_register() on the underlying platform_device. + * Returns the return value of platform_device_register(). + */ +int omap_device_register(struct platform_device *pdev) +{ + pr_debug("omap_device: %s: registering\n", pdev->name); + + pdev->dev.pm_domain = &omap_device_pm_domain; + return platform_device_add(pdev); +} + + +/* Public functions for use by device drivers through struct platform_data */ + +/** + * omap_device_enable - fully activate an omap_device + * @od: struct omap_device * to activate + * + * Do whatever is necessary for the hwmods underlying omap_device @od + * to be accessible and ready to operate. This generally involves + * enabling clocks, setting SYSCONFIG registers; and in the future may + * involve remuxing pins. Device drivers should call this function + * indirectly via pm_runtime_get*(). Returns -EINVAL if called when + * the omap_device is already enabled, or passes along the return + * value of _omap_device_enable_hwmods(). + */ +int omap_device_enable(struct platform_device *pdev) +{ + int ret; + struct omap_device *od; + + od = to_omap_device(pdev); + + if (od->_state == OMAP_DEVICE_STATE_ENABLED) { + dev_warn(&pdev->dev, + "omap_device: %s() called from invalid state %d\n", + __func__, od->_state); + return -EINVAL; + } + + ret = _omap_device_enable_hwmods(od); + + od->_state = OMAP_DEVICE_STATE_ENABLED; + + return ret; +} + +/** + * omap_device_idle - idle an omap_device + * @od: struct omap_device * to idle + * + * Idle omap_device @od. Device drivers call this function indirectly + * via pm_runtime_put*(). Returns -EINVAL if the omap_device is not + * currently enabled, or passes along the return value of + * _omap_device_idle_hwmods(). + */ +int omap_device_idle(struct platform_device *pdev) +{ + int ret; + struct omap_device *od; + + od = to_omap_device(pdev); + + if (od->_state != OMAP_DEVICE_STATE_ENABLED) { + dev_warn(&pdev->dev, + "omap_device: %s() called from invalid state %d\n", + __func__, od->_state); + return -EINVAL; + } + + ret = _omap_device_idle_hwmods(od); + + od->_state = OMAP_DEVICE_STATE_IDLE; + + return ret; +} + +/** + * omap_device_assert_hardreset - set a device's hardreset line + * @pdev: struct platform_device * to reset + * @name: const char * name of the reset line + * + * Set the hardreset line identified by @name on the IP blocks + * associated with the hwmods backing the platform_device @pdev. All + * of the hwmods associated with @pdev must have the same hardreset + * line linked to them for this to work. Passes along the return value + * of omap_hwmod_assert_hardreset() in the event of any failure, or + * returns 0 upon success. + */ +int omap_device_assert_hardreset(struct platform_device *pdev, const char *name) +{ + struct omap_device *od = to_omap_device(pdev); + int ret = 0; + int i; + + for (i = 0; i < od->hwmods_cnt; i++) { + ret = omap_hwmod_assert_hardreset(od->hwmods[i], name); + if (ret) + break; + } + + return ret; +} + +/** + * omap_device_deassert_hardreset - release a device's hardreset line + * @pdev: struct platform_device * to reset + * @name: const char * name of the reset line + * + * Release the hardreset line identified by @name on the IP blocks + * associated with the hwmods backing the platform_device @pdev. All + * of the hwmods associated with @pdev must have the same hardreset + * line linked to them for this to work. Passes along the return + * value of omap_hwmod_deassert_hardreset() in the event of any + * failure, or returns 0 upon success. + */ +int omap_device_deassert_hardreset(struct platform_device *pdev, + const char *name) +{ + struct omap_device *od = to_omap_device(pdev); + int ret = 0; + int i; + + for (i = 0; i < od->hwmods_cnt; i++) { + ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name); + if (ret) + break; + } + + return ret; +} + +/** + * omap_device_get_by_hwmod_name() - convert a hwmod name to + * device pointer. + * @oh_name: name of the hwmod device + * + * Returns back a struct device * pointer associated with a hwmod + * device represented by a hwmod_name + */ +struct device *omap_device_get_by_hwmod_name(const char *oh_name) +{ + struct omap_hwmod *oh; + + if (!oh_name) { + WARN(1, "%s: no hwmod name!\n", __func__); + return ERR_PTR(-EINVAL); + } + + oh = omap_hwmod_lookup(oh_name); + if (!oh) { + WARN(1, "%s: no hwmod for %s\n", __func__, + oh_name); + return ERR_PTR(-ENODEV); + } + if (!oh->od) { + WARN(1, "%s: no omap_device for %s\n", __func__, + oh_name); + return ERR_PTR(-ENODEV); + } + + return &oh->od->pdev->dev; +} + +static struct notifier_block platform_nb = { + .notifier_call = _omap_device_notifier_call, +}; + +static int __init omap_device_init(void) +{ + bus_register_notifier(&platform_bus_type, &platform_nb); + return 0; +} +omap_core_initcall(omap_device_init); + +/** + * omap_device_late_idle - idle devices without drivers + * @dev: struct device * associated with omap_device + * @data: unused + * + * Check the driver bound status of this device, and idle it + * if there is no driver attached. + */ +static int __init omap_device_late_idle(struct device *dev, void *data) +{ + struct platform_device *pdev = to_platform_device(dev); + struct omap_device *od = to_omap_device(pdev); + int i; + + if (!od) + return 0; + + /* + * If omap_device state is enabled, but has no driver bound, + * idle it. + */ + + /* + * Some devices (like memory controllers) are always kept + * enabled, and should not be idled even with no drivers. + */ + for (i = 0; i < od->hwmods_cnt; i++) + if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE) + return 0; + + if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) { + if (od->_state == OMAP_DEVICE_STATE_ENABLED) { + dev_warn(dev, "%s: enabled but no driver. Idling\n", + __func__); + omap_device_idle(pdev); + } + } + + return 0; +} + +static int __init omap_device_late_init(void) +{ + bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle); + + WARN(!of_have_populated_dt(), + "legacy booting deprecated, please update to boot with .dts\n"); + + return 0; +} +omap_late_initcall_sync(omap_device_late_init); |