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![Stephen Boyd](/assets/img/avatar_default.png)
Add the call to of_clk_set_defaults() into the amba probe path so that devices on the amba bus can use the assigned rates and parents feature of the common clock framework. Cc: Michael Turquette <mturquette@baylibre.com> Tested-by: Jorge Ramirez Ortiz <jorge.ramirez-ortiz@linaro.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
764 lines
18 KiB
C
764 lines
18 KiB
C
/*
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* linux/arch/arm/common/amba.c
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*
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* Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/pm_domain.h>
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#include <linux/amba/bus.h>
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#include <linux/sizes.h>
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#include <linux/limits.h>
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#include <linux/clk/clk-conf.h>
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#include <asm/irq.h>
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#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
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static const struct amba_id *
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amba_lookup(const struct amba_id *table, struct amba_device *dev)
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{
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int ret = 0;
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while (table->mask) {
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ret = (dev->periphid & table->mask) == table->id;
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if (ret)
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break;
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table++;
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}
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return ret ? table : NULL;
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}
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static int amba_match(struct device *dev, struct device_driver *drv)
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{
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struct amba_device *pcdev = to_amba_device(dev);
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struct amba_driver *pcdrv = to_amba_driver(drv);
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/* When driver_override is set, only bind to the matching driver */
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if (pcdev->driver_override)
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return !strcmp(pcdev->driver_override, drv->name);
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return amba_lookup(pcdrv->id_table, pcdev) != NULL;
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}
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static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct amba_device *pcdev = to_amba_device(dev);
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int retval = 0;
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retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
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if (retval)
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return retval;
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retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid);
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return retval;
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}
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static ssize_t driver_override_show(struct device *_dev,
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struct device_attribute *attr, char *buf)
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{
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struct amba_device *dev = to_amba_device(_dev);
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if (!dev->driver_override)
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return 0;
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return sprintf(buf, "%s\n", dev->driver_override);
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}
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static ssize_t driver_override_store(struct device *_dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct amba_device *dev = to_amba_device(_dev);
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char *driver_override, *old = dev->driver_override, *cp;
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if (count > PATH_MAX)
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return -EINVAL;
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driver_override = kstrndup(buf, count, GFP_KERNEL);
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if (!driver_override)
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return -ENOMEM;
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cp = strchr(driver_override, '\n');
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if (cp)
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*cp = '\0';
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if (strlen(driver_override)) {
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dev->driver_override = driver_override;
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} else {
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kfree(driver_override);
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dev->driver_override = NULL;
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}
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kfree(old);
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return count;
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}
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#define amba_attr_func(name,fmt,arg...) \
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static ssize_t name##_show(struct device *_dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct amba_device *dev = to_amba_device(_dev); \
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return sprintf(buf, fmt, arg); \
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}
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#define amba_attr(name,fmt,arg...) \
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amba_attr_func(name,fmt,arg) \
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static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
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amba_attr_func(id, "%08x\n", dev->periphid);
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amba_attr(irq0, "%u\n", dev->irq[0]);
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amba_attr(irq1, "%u\n", dev->irq[1]);
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amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
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(unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
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dev->res.flags);
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static struct device_attribute amba_dev_attrs[] = {
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__ATTR_RO(id),
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__ATTR_RO(resource),
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__ATTR_RW(driver_override),
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__ATTR_NULL,
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};
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#ifdef CONFIG_PM
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/*
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* Hooks to provide runtime PM of the pclk (bus clock). It is safe to
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* enable/disable the bus clock at runtime PM suspend/resume as this
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* does not result in loss of context.
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*/
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static int amba_pm_runtime_suspend(struct device *dev)
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{
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struct amba_device *pcdev = to_amba_device(dev);
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int ret = pm_generic_runtime_suspend(dev);
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if (ret == 0 && dev->driver) {
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if (pm_runtime_is_irq_safe(dev))
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clk_disable(pcdev->pclk);
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else
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clk_disable_unprepare(pcdev->pclk);
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}
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return ret;
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}
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static int amba_pm_runtime_resume(struct device *dev)
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{
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struct amba_device *pcdev = to_amba_device(dev);
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int ret;
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if (dev->driver) {
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if (pm_runtime_is_irq_safe(dev))
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ret = clk_enable(pcdev->pclk);
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else
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ret = clk_prepare_enable(pcdev->pclk);
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/* Failure is probably fatal to the system, but... */
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if (ret)
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return ret;
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}
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return pm_generic_runtime_resume(dev);
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}
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#endif /* CONFIG_PM */
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static const struct dev_pm_ops amba_pm = {
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.suspend = pm_generic_suspend,
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.resume = pm_generic_resume,
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.freeze = pm_generic_freeze,
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.thaw = pm_generic_thaw,
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.poweroff = pm_generic_poweroff,
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.restore = pm_generic_restore,
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SET_RUNTIME_PM_OPS(
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amba_pm_runtime_suspend,
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amba_pm_runtime_resume,
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NULL
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)
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};
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/*
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* Primecells are part of the Advanced Microcontroller Bus Architecture,
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* so we call the bus "amba".
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*/
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struct bus_type amba_bustype = {
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.name = "amba",
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.dev_attrs = amba_dev_attrs,
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.match = amba_match,
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.uevent = amba_uevent,
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.pm = &amba_pm,
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};
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static int __init amba_init(void)
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{
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return bus_register(&amba_bustype);
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}
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postcore_initcall(amba_init);
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static int amba_get_enable_pclk(struct amba_device *pcdev)
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{
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int ret;
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pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk");
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if (IS_ERR(pcdev->pclk))
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return PTR_ERR(pcdev->pclk);
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ret = clk_prepare_enable(pcdev->pclk);
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if (ret)
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clk_put(pcdev->pclk);
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return ret;
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}
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static void amba_put_disable_pclk(struct amba_device *pcdev)
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{
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clk_disable_unprepare(pcdev->pclk);
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clk_put(pcdev->pclk);
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}
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/*
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* These are the device model conversion veneers; they convert the
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* device model structures to our more specific structures.
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*/
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static int amba_probe(struct device *dev)
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{
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struct amba_device *pcdev = to_amba_device(dev);
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struct amba_driver *pcdrv = to_amba_driver(dev->driver);
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const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
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int ret;
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do {
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ret = of_clk_set_defaults(dev->of_node, false);
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if (ret < 0)
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break;
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ret = dev_pm_domain_attach(dev, true);
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if (ret == -EPROBE_DEFER)
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break;
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ret = amba_get_enable_pclk(pcdev);
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if (ret) {
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dev_pm_domain_detach(dev, true);
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break;
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}
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pm_runtime_get_noresume(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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ret = pcdrv->probe(pcdev, id);
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if (ret == 0)
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break;
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pm_runtime_disable(dev);
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pm_runtime_set_suspended(dev);
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pm_runtime_put_noidle(dev);
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amba_put_disable_pclk(pcdev);
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dev_pm_domain_detach(dev, true);
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} while (0);
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return ret;
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}
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static int amba_remove(struct device *dev)
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{
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struct amba_device *pcdev = to_amba_device(dev);
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struct amba_driver *drv = to_amba_driver(dev->driver);
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int ret;
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pm_runtime_get_sync(dev);
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ret = drv->remove(pcdev);
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pm_runtime_put_noidle(dev);
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/* Undo the runtime PM settings in amba_probe() */
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pm_runtime_disable(dev);
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pm_runtime_set_suspended(dev);
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pm_runtime_put_noidle(dev);
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amba_put_disable_pclk(pcdev);
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dev_pm_domain_detach(dev, true);
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return ret;
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}
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static void amba_shutdown(struct device *dev)
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{
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struct amba_driver *drv = to_amba_driver(dev->driver);
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drv->shutdown(to_amba_device(dev));
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}
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/**
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* amba_driver_register - register an AMBA device driver
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* @drv: amba device driver structure
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*
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* Register an AMBA device driver with the Linux device model
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* core. If devices pre-exist, the drivers probe function will
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* be called.
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*/
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int amba_driver_register(struct amba_driver *drv)
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{
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drv->drv.bus = &amba_bustype;
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#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
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SETFN(probe);
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SETFN(remove);
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SETFN(shutdown);
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return driver_register(&drv->drv);
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}
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/**
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* amba_driver_unregister - remove an AMBA device driver
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* @drv: AMBA device driver structure to remove
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*
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* Unregister an AMBA device driver from the Linux device
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* model. The device model will call the drivers remove function
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* for each device the device driver is currently handling.
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*/
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void amba_driver_unregister(struct amba_driver *drv)
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{
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driver_unregister(&drv->drv);
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}
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static void amba_device_release(struct device *dev)
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{
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struct amba_device *d = to_amba_device(dev);
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if (d->res.parent)
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release_resource(&d->res);
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kfree(d);
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}
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static int amba_device_try_add(struct amba_device *dev, struct resource *parent)
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{
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u32 size;
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void __iomem *tmp;
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int i, ret;
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WARN_ON(dev->irq[0] == (unsigned int)-1);
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WARN_ON(dev->irq[1] == (unsigned int)-1);
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ret = request_resource(parent, &dev->res);
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if (ret)
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goto err_out;
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/* Hard-coded primecell ID instead of plug-n-play */
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if (dev->periphid != 0)
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goto skip_probe;
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/*
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* Dynamically calculate the size of the resource
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* and use this for iomap
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*/
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size = resource_size(&dev->res);
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tmp = ioremap(dev->res.start, size);
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if (!tmp) {
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ret = -ENOMEM;
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goto err_release;
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}
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ret = dev_pm_domain_attach(&dev->dev, true);
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if (ret == -EPROBE_DEFER) {
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iounmap(tmp);
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goto err_release;
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}
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ret = amba_get_enable_pclk(dev);
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if (ret == 0) {
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u32 pid, cid;
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/*
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* Read pid and cid based on size of resource
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* they are located at end of region
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*/
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for (pid = 0, i = 0; i < 4; i++)
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pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
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(i * 8);
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for (cid = 0, i = 0; i < 4; i++)
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cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
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(i * 8);
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amba_put_disable_pclk(dev);
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if (cid == AMBA_CID || cid == CORESIGHT_CID)
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dev->periphid = pid;
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if (!dev->periphid)
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ret = -ENODEV;
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}
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iounmap(tmp);
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dev_pm_domain_detach(&dev->dev, true);
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if (ret)
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goto err_release;
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skip_probe:
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ret = device_add(&dev->dev);
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if (ret)
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goto err_release;
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if (dev->irq[0])
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ret = device_create_file(&dev->dev, &dev_attr_irq0);
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if (ret == 0 && dev->irq[1])
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ret = device_create_file(&dev->dev, &dev_attr_irq1);
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if (ret == 0)
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return ret;
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device_unregister(&dev->dev);
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err_release:
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release_resource(&dev->res);
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err_out:
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return ret;
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}
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/*
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* Registration of AMBA device require reading its pid and cid registers.
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* To do this, the device must be turned on (if it is a part of power domain)
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* and have clocks enabled. However in some cases those resources might not be
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* yet available. Returning EPROBE_DEFER is not a solution in such case,
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* because callers don't handle this special error code. Instead such devices
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* are added to the special list and their registration is retried from
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* periodic worker, until all resources are available and registration succeeds.
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*/
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struct deferred_device {
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struct amba_device *dev;
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struct resource *parent;
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struct list_head node;
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};
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static LIST_HEAD(deferred_devices);
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static DEFINE_MUTEX(deferred_devices_lock);
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static void amba_deferred_retry_func(struct work_struct *dummy);
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static DECLARE_DELAYED_WORK(deferred_retry_work, amba_deferred_retry_func);
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#define DEFERRED_DEVICE_TIMEOUT (msecs_to_jiffies(5 * 1000))
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static void amba_deferred_retry_func(struct work_struct *dummy)
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{
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struct deferred_device *ddev, *tmp;
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mutex_lock(&deferred_devices_lock);
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list_for_each_entry_safe(ddev, tmp, &deferred_devices, node) {
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int ret = amba_device_try_add(ddev->dev, ddev->parent);
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if (ret == -EPROBE_DEFER)
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continue;
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list_del_init(&ddev->node);
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kfree(ddev);
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}
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|
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if (!list_empty(&deferred_devices))
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schedule_delayed_work(&deferred_retry_work,
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DEFERRED_DEVICE_TIMEOUT);
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mutex_unlock(&deferred_devices_lock);
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}
|
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/**
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* amba_device_add - add a previously allocated AMBA device structure
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* @dev: AMBA device allocated by amba_device_alloc
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* @parent: resource parent for this devices resources
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*
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* Claim the resource, and read the device cell ID if not already
|
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* initialized. Register the AMBA device with the Linux device
|
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* manager.
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*/
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int amba_device_add(struct amba_device *dev, struct resource *parent)
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{
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int ret = amba_device_try_add(dev, parent);
|
|
|
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if (ret == -EPROBE_DEFER) {
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struct deferred_device *ddev;
|
|
|
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ddev = kmalloc(sizeof(*ddev), GFP_KERNEL);
|
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if (!ddev)
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return -ENOMEM;
|
|
|
|
ddev->dev = dev;
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ddev->parent = parent;
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ret = 0;
|
|
|
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mutex_lock(&deferred_devices_lock);
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|
|
if (list_empty(&deferred_devices))
|
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schedule_delayed_work(&deferred_retry_work,
|
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DEFERRED_DEVICE_TIMEOUT);
|
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list_add_tail(&ddev->node, &deferred_devices);
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|
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mutex_unlock(&deferred_devices_lock);
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}
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return ret;
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}
|
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EXPORT_SYMBOL_GPL(amba_device_add);
|
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|
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static struct amba_device *
|
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amba_aphb_device_add(struct device *parent, const char *name,
|
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resource_size_t base, size_t size, int irq1, int irq2,
|
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void *pdata, unsigned int periphid, u64 dma_mask,
|
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struct resource *resbase)
|
|
{
|
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struct amba_device *dev;
|
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int ret;
|
|
|
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dev = amba_device_alloc(name, base, size);
|
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if (!dev)
|
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return ERR_PTR(-ENOMEM);
|
|
|
|
dev->dev.coherent_dma_mask = dma_mask;
|
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dev->irq[0] = irq1;
|
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dev->irq[1] = irq2;
|
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dev->periphid = periphid;
|
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dev->dev.platform_data = pdata;
|
|
dev->dev.parent = parent;
|
|
|
|
ret = amba_device_add(dev, resbase);
|
|
if (ret) {
|
|
amba_device_put(dev);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
|
|
struct amba_device *
|
|
amba_apb_device_add(struct device *parent, const char *name,
|
|
resource_size_t base, size_t size, int irq1, int irq2,
|
|
void *pdata, unsigned int periphid)
|
|
{
|
|
return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
|
|
periphid, 0, &iomem_resource);
|
|
}
|
|
EXPORT_SYMBOL_GPL(amba_apb_device_add);
|
|
|
|
struct amba_device *
|
|
amba_ahb_device_add(struct device *parent, const char *name,
|
|
resource_size_t base, size_t size, int irq1, int irq2,
|
|
void *pdata, unsigned int periphid)
|
|
{
|
|
return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
|
|
periphid, ~0ULL, &iomem_resource);
|
|
}
|
|
EXPORT_SYMBOL_GPL(amba_ahb_device_add);
|
|
|
|
struct amba_device *
|
|
amba_apb_device_add_res(struct device *parent, const char *name,
|
|
resource_size_t base, size_t size, int irq1,
|
|
int irq2, void *pdata, unsigned int periphid,
|
|
struct resource *resbase)
|
|
{
|
|
return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
|
|
periphid, 0, resbase);
|
|
}
|
|
EXPORT_SYMBOL_GPL(amba_apb_device_add_res);
|
|
|
|
struct amba_device *
|
|
amba_ahb_device_add_res(struct device *parent, const char *name,
|
|
resource_size_t base, size_t size, int irq1,
|
|
int irq2, void *pdata, unsigned int periphid,
|
|
struct resource *resbase)
|
|
{
|
|
return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
|
|
periphid, ~0ULL, resbase);
|
|
}
|
|
EXPORT_SYMBOL_GPL(amba_ahb_device_add_res);
|
|
|
|
|
|
static void amba_device_initialize(struct amba_device *dev, const char *name)
|
|
{
|
|
device_initialize(&dev->dev);
|
|
if (name)
|
|
dev_set_name(&dev->dev, "%s", name);
|
|
dev->dev.release = amba_device_release;
|
|
dev->dev.bus = &amba_bustype;
|
|
dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
|
|
dev->res.name = dev_name(&dev->dev);
|
|
}
|
|
|
|
/**
|
|
* amba_device_alloc - allocate an AMBA device
|
|
* @name: sysfs name of the AMBA device
|
|
* @base: base of AMBA device
|
|
* @size: size of AMBA device
|
|
*
|
|
* Allocate and initialize an AMBA device structure. Returns %NULL
|
|
* on failure.
|
|
*/
|
|
struct amba_device *amba_device_alloc(const char *name, resource_size_t base,
|
|
size_t size)
|
|
{
|
|
struct amba_device *dev;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (dev) {
|
|
amba_device_initialize(dev, name);
|
|
dev->res.start = base;
|
|
dev->res.end = base + size - 1;
|
|
dev->res.flags = IORESOURCE_MEM;
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(amba_device_alloc);
|
|
|
|
/**
|
|
* amba_device_register - register an AMBA device
|
|
* @dev: AMBA device to register
|
|
* @parent: parent memory resource
|
|
*
|
|
* Setup the AMBA device, reading the cell ID if present.
|
|
* Claim the resource, and register the AMBA device with
|
|
* the Linux device manager.
|
|
*/
|
|
int amba_device_register(struct amba_device *dev, struct resource *parent)
|
|
{
|
|
amba_device_initialize(dev, dev->dev.init_name);
|
|
dev->dev.init_name = NULL;
|
|
|
|
return amba_device_add(dev, parent);
|
|
}
|
|
|
|
/**
|
|
* amba_device_put - put an AMBA device
|
|
* @dev: AMBA device to put
|
|
*/
|
|
void amba_device_put(struct amba_device *dev)
|
|
{
|
|
put_device(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(amba_device_put);
|
|
|
|
/**
|
|
* amba_device_unregister - unregister an AMBA device
|
|
* @dev: AMBA device to remove
|
|
*
|
|
* Remove the specified AMBA device from the Linux device
|
|
* manager. All files associated with this object will be
|
|
* destroyed, and device drivers notified that the device has
|
|
* been removed. The AMBA device's resources including
|
|
* the amba_device structure will be freed once all
|
|
* references to it have been dropped.
|
|
*/
|
|
void amba_device_unregister(struct amba_device *dev)
|
|
{
|
|
device_unregister(&dev->dev);
|
|
}
|
|
|
|
|
|
struct find_data {
|
|
struct amba_device *dev;
|
|
struct device *parent;
|
|
const char *busid;
|
|
unsigned int id;
|
|
unsigned int mask;
|
|
};
|
|
|
|
static int amba_find_match(struct device *dev, void *data)
|
|
{
|
|
struct find_data *d = data;
|
|
struct amba_device *pcdev = to_amba_device(dev);
|
|
int r;
|
|
|
|
r = (pcdev->periphid & d->mask) == d->id;
|
|
if (d->parent)
|
|
r &= d->parent == dev->parent;
|
|
if (d->busid)
|
|
r &= strcmp(dev_name(dev), d->busid) == 0;
|
|
|
|
if (r) {
|
|
get_device(dev);
|
|
d->dev = pcdev;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* amba_find_device - locate an AMBA device given a bus id
|
|
* @busid: bus id for device (or NULL)
|
|
* @parent: parent device (or NULL)
|
|
* @id: peripheral ID (or 0)
|
|
* @mask: peripheral ID mask (or 0)
|
|
*
|
|
* Return the AMBA device corresponding to the supplied parameters.
|
|
* If no device matches, returns NULL.
|
|
*
|
|
* NOTE: When a valid device is found, its refcount is
|
|
* incremented, and must be decremented before the returned
|
|
* reference.
|
|
*/
|
|
struct amba_device *
|
|
amba_find_device(const char *busid, struct device *parent, unsigned int id,
|
|
unsigned int mask)
|
|
{
|
|
struct find_data data;
|
|
|
|
data.dev = NULL;
|
|
data.parent = parent;
|
|
data.busid = busid;
|
|
data.id = id;
|
|
data.mask = mask;
|
|
|
|
bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
|
|
|
|
return data.dev;
|
|
}
|
|
|
|
/**
|
|
* amba_request_regions - request all mem regions associated with device
|
|
* @dev: amba_device structure for device
|
|
* @name: name, or NULL to use driver name
|
|
*/
|
|
int amba_request_regions(struct amba_device *dev, const char *name)
|
|
{
|
|
int ret = 0;
|
|
u32 size;
|
|
|
|
if (!name)
|
|
name = dev->dev.driver->name;
|
|
|
|
size = resource_size(&dev->res);
|
|
|
|
if (!request_mem_region(dev->res.start, size, name))
|
|
ret = -EBUSY;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* amba_release_regions - release mem regions associated with device
|
|
* @dev: amba_device structure for device
|
|
*
|
|
* Release regions claimed by a successful call to amba_request_regions.
|
|
*/
|
|
void amba_release_regions(struct amba_device *dev)
|
|
{
|
|
u32 size;
|
|
|
|
size = resource_size(&dev->res);
|
|
release_mem_region(dev->res.start, size);
|
|
}
|
|
|
|
EXPORT_SYMBOL(amba_driver_register);
|
|
EXPORT_SYMBOL(amba_driver_unregister);
|
|
EXPORT_SYMBOL(amba_device_register);
|
|
EXPORT_SYMBOL(amba_device_unregister);
|
|
EXPORT_SYMBOL(amba_find_device);
|
|
EXPORT_SYMBOL(amba_request_regions);
|
|
EXPORT_SYMBOL(amba_release_regions);
|