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![Wang Kefeng](/assets/img/avatar_default.png)
Some EXPORT_SYMBOL() is at the end of the function, but some is at the end of file. For reader sanity and be consistent, move all EXPORT_SYMBOL() declarations just after the end of the function. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
710 lines
17 KiB
C
710 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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 <linux/platform_device.h>
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#include <linux/reset.h>
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#include <linux/of_irq.h>
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#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
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/* called on periphid match and class 0x9 coresight device. */
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static int
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amba_cs_uci_id_match(const struct amba_id *table, struct amba_device *dev)
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{
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int ret = 0;
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struct amba_cs_uci_id *uci;
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uci = table->data;
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/* no table data or zero mask - return match on periphid */
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if (!uci || (uci->devarch_mask == 0))
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return 1;
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/* test against read devtype and masked devarch value */
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ret = (dev->uci.devtype == uci->devtype) &&
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((dev->uci.devarch & uci->devarch_mask) == uci->devarch);
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return ret;
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}
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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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while (table->mask) {
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if (((dev->periphid & table->mask) == table->id) &&
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((dev->cid != CORESIGHT_CID) ||
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(amba_cs_uci_id_match(table, dev))))
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return table;
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table++;
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}
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return NULL;
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}
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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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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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ssize_t len;
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device_lock(_dev);
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len = sprintf(buf, "%s\n", dev->driver_override);
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device_unlock(_dev);
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return len;
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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, *cp;
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/* We need to keep extra room for a newline */
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if (count >= (PAGE_SIZE - 1))
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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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device_lock(_dev);
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old = dev->driver_override;
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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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device_unlock(_dev);
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kfree(old);
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return count;
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}
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static DEVICE_ATTR_RW(driver_override);
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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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static DEVICE_ATTR_RO(name)
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amba_attr_func(id, "%08x\n", dev->periphid);
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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 attribute *amba_dev_attrs[] = {
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&dev_attr_id.attr,
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&dev_attr_resource.attr,
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&dev_attr_driver_override.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(amba_dev);
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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 int of_amba_device_decode_irq(struct amba_device *dev)
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{
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struct device_node *node = dev->dev.of_node;
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int i, irq = 0;
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if (IS_ENABLED(CONFIG_OF_IRQ) && node) {
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/* Decode the IRQs and address ranges */
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for (i = 0; i < AMBA_NR_IRQS; i++) {
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irq = of_irq_get(node, i);
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if (irq < 0) {
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if (irq == -EPROBE_DEFER)
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return irq;
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irq = 0;
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}
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dev->irq[i] = irq;
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}
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}
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return 0;
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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_amba_device_decode_irq(pcdev);
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if (ret)
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break;
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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)
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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 void 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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pm_runtime_get_sync(dev);
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if (drv->remove)
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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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}
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static void amba_shutdown(struct device *dev)
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{
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struct amba_driver *drv;
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if (!dev->driver)
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return;
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drv = to_amba_driver(dev->driver);
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if (drv->shutdown)
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drv->shutdown(to_amba_device(dev));
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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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* DMA configuration for platform and AMBA bus is same. So here we reuse
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* platform's DMA config routine.
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*/
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struct bus_type amba_bustype = {
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.name = "amba",
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.dev_groups = amba_dev_groups,
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.match = amba_match,
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.uevent = amba_uevent,
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.probe = amba_probe,
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.remove = amba_remove,
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.shutdown = amba_shutdown,
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.dma_configure = platform_dma_configure,
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.pm = &amba_pm,
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};
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EXPORT_SYMBOL_GPL(amba_bustype);
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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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/**
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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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if (!drv->probe)
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return -EINVAL;
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drv->drv.bus = &amba_bustype;
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return driver_register(&drv->drv);
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}
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EXPORT_SYMBOL(amba_driver_register);
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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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EXPORT_SYMBOL(amba_driver_unregister);
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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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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) {
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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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struct reset_control *rstc;
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/*
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* Find reset control(s) of the amba bus and de-assert them.
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*/
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rstc = of_reset_control_array_get_optional_shared(dev->dev.of_node);
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if (IS_ERR(rstc)) {
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ret = PTR_ERR(rstc);
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if (ret != -EPROBE_DEFER)
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dev_err(&dev->dev, "can't get reset: %d\n",
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ret);
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goto err_reset;
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}
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reset_control_deassert(rstc);
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reset_control_put(rstc);
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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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if (cid == CORESIGHT_CID) {
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/* set the base to the start of the last 4k block */
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void __iomem *csbase = tmp + size - 4096;
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dev->uci.devarch =
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readl(csbase + UCI_REG_DEVARCH_OFFSET);
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dev->uci.devtype =
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readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff;
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}
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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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dev->cid = cid;
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}
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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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err_release:
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if (ret)
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release_resource(&dev->res);
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err_out:
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return ret;
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err_reset:
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amba_put_disable_pclk(dev);
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iounmap(tmp);
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dev_pm_domain_detach(&dev->dev, true);
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goto err_release;
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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 int amba_deferred_retry(void)
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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) {
|
|
int ret = amba_device_try_add(ddev->dev, ddev->parent);
|
|
|
|
if (ret == -EPROBE_DEFER)
|
|
continue;
|
|
|
|
list_del_init(&ddev->node);
|
|
kfree(ddev);
|
|
}
|
|
|
|
mutex_unlock(&deferred_devices_lock);
|
|
|
|
return 0;
|
|
}
|
|
late_initcall(amba_deferred_retry);
|
|
|
|
static void amba_deferred_retry_func(struct work_struct *dummy)
|
|
{
|
|
amba_deferred_retry();
|
|
|
|
if (!list_empty(&deferred_devices))
|
|
schedule_delayed_work(&deferred_retry_work,
|
|
DEFERRED_DEVICE_TIMEOUT);
|
|
}
|
|
|
|
/**
|
|
* amba_device_add - add a previously allocated AMBA device structure
|
|
* @dev: AMBA device allocated by amba_device_alloc
|
|
* @parent: resource parent for this devices resources
|
|
*
|
|
* Claim the resource, and read the device cell ID if not already
|
|
* initialized. Register the AMBA device with the Linux device
|
|
* manager.
|
|
*/
|
|
int amba_device_add(struct amba_device *dev, struct resource *parent)
|
|
{
|
|
int ret = amba_device_try_add(dev, parent);
|
|
|
|
if (ret == -EPROBE_DEFER) {
|
|
struct deferred_device *ddev;
|
|
|
|
ddev = kmalloc(sizeof(*ddev), GFP_KERNEL);
|
|
if (!ddev)
|
|
return -ENOMEM;
|
|
|
|
ddev->dev = dev;
|
|
ddev->parent = parent;
|
|
ret = 0;
|
|
|
|
mutex_lock(&deferred_devices_lock);
|
|
|
|
if (list_empty(&deferred_devices))
|
|
schedule_delayed_work(&deferred_retry_work,
|
|
DEFERRED_DEVICE_TIMEOUT);
|
|
list_add_tail(&ddev->node, &deferred_devices);
|
|
|
|
mutex_unlock(&deferred_devices_lock);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(amba_device_add);
|
|
|
|
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->dev.dma_parms = &dev->dma_parms;
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL(amba_device_register);
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
EXPORT_SYMBOL(amba_device_unregister);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL(amba_request_regions);
|
|
|
|
/**
|
|
* 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_release_regions);
|