341 lines
8.8 KiB
C
341 lines
8.8 KiB
C
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// SPDX--License-Identifier: GPL-2.0
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#include <asm/platform_early.h>
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#include <linux/mod_devicetable.h>
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#include <linux/pm.h>
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static __initdata LIST_HEAD(sh_early_platform_driver_list);
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static __initdata LIST_HEAD(sh_early_platform_device_list);
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static const struct platform_device_id *
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platform_match_id(const struct platform_device_id *id,
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struct platform_device *pdev)
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{
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while (id->name[0]) {
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if (strcmp(pdev->name, id->name) == 0) {
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pdev->id_entry = id;
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return id;
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}
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id++;
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}
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return NULL;
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}
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static int platform_match(struct device *dev, struct device_driver *drv)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct platform_driver *pdrv = to_platform_driver(drv);
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/* When driver_override is set, only bind to the matching driver */
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if (pdev->driver_override)
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return !strcmp(pdev->driver_override, drv->name);
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/* Then try to match against the id table */
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if (pdrv->id_table)
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return platform_match_id(pdrv->id_table, pdev) != NULL;
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/* fall-back to driver name match */
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return (strcmp(pdev->name, drv->name) == 0);
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}
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#ifdef CONFIG_PM
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static void device_pm_init_common(struct device *dev)
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{
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if (!dev->power.early_init) {
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spin_lock_init(&dev->power.lock);
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dev->power.qos = NULL;
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dev->power.early_init = true;
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}
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}
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static void pm_runtime_early_init(struct device *dev)
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{
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dev->power.disable_depth = 1;
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device_pm_init_common(dev);
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}
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#else
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static void pm_runtime_early_init(struct device *dev) {}
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#endif
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/**
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* sh_early_platform_driver_register - register early platform driver
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* @epdrv: sh_early_platform driver structure
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* @buf: string passed from early_param()
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*
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* Helper function for sh_early_platform_init() / sh_early_platform_init_buffer()
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*/
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int __init sh_early_platform_driver_register(struct sh_early_platform_driver *epdrv,
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char *buf)
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{
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char *tmp;
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int n;
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/* Simply add the driver to the end of the global list.
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* Drivers will by default be put on the list in compiled-in order.
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*/
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if (!epdrv->list.next) {
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INIT_LIST_HEAD(&epdrv->list);
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list_add_tail(&epdrv->list, &sh_early_platform_driver_list);
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}
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/* If the user has specified device then make sure the driver
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* gets prioritized. The driver of the last device specified on
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* command line will be put first on the list.
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*/
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n = strlen(epdrv->pdrv->driver.name);
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if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
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list_move(&epdrv->list, &sh_early_platform_driver_list);
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/* Allow passing parameters after device name */
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if (buf[n] == '\0' || buf[n] == ',')
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epdrv->requested_id = -1;
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else {
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epdrv->requested_id = simple_strtoul(&buf[n + 1],
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&tmp, 10);
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if (buf[n] != '.' || (tmp == &buf[n + 1])) {
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epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
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n = 0;
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} else
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n += strcspn(&buf[n + 1], ",") + 1;
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}
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if (buf[n] == ',')
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n++;
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if (epdrv->bufsize) {
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memcpy(epdrv->buffer, &buf[n],
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min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
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epdrv->buffer[epdrv->bufsize - 1] = '\0';
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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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* sh_early_platform_add_devices - adds a number of early platform devices
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* @devs: array of early platform devices to add
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* @num: number of early platform devices in array
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*
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* Used by early architecture code to register early platform devices and
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* their platform data.
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*/
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void __init sh_early_platform_add_devices(struct platform_device **devs, int num)
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{
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struct device *dev;
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int i;
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/* simply add the devices to list */
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for (i = 0; i < num; i++) {
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dev = &devs[i]->dev;
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if (!dev->devres_head.next) {
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pm_runtime_early_init(dev);
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INIT_LIST_HEAD(&dev->devres_head);
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list_add_tail(&dev->devres_head,
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&sh_early_platform_device_list);
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}
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}
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}
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/**
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* sh_early_platform_driver_register_all - register early platform drivers
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* @class_str: string to identify early platform driver class
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*
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* Used by architecture code to register all early platform drivers
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* for a certain class. If omitted then only early platform drivers
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* with matching kernel command line class parameters will be registered.
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*/
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void __init sh_early_platform_driver_register_all(char *class_str)
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{
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/* The "class_str" parameter may or may not be present on the kernel
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* command line. If it is present then there may be more than one
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* matching parameter.
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*
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* Since we register our early platform drivers using early_param()
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* we need to make sure that they also get registered in the case
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* when the parameter is missing from the kernel command line.
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*
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* We use parse_early_options() to make sure the early_param() gets
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* called at least once. The early_param() may be called more than
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* once since the name of the preferred device may be specified on
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* the kernel command line. sh_early_platform_driver_register() handles
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* this case for us.
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*/
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parse_early_options(class_str);
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}
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/**
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* sh_early_platform_match - find early platform device matching driver
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* @epdrv: early platform driver structure
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* @id: id to match against
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*/
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static struct platform_device * __init
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sh_early_platform_match(struct sh_early_platform_driver *epdrv, int id)
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{
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struct platform_device *pd;
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list_for_each_entry(pd, &sh_early_platform_device_list, dev.devres_head)
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if (platform_match(&pd->dev, &epdrv->pdrv->driver))
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if (pd->id == id)
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return pd;
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return NULL;
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}
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/**
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* sh_early_platform_left - check if early platform driver has matching devices
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* @epdrv: early platform driver structure
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* @id: return true if id or above exists
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*/
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static int __init sh_early_platform_left(struct sh_early_platform_driver *epdrv,
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int id)
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{
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struct platform_device *pd;
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list_for_each_entry(pd, &sh_early_platform_device_list, dev.devres_head)
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if (platform_match(&pd->dev, &epdrv->pdrv->driver))
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if (pd->id >= id)
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return 1;
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return 0;
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}
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/**
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* sh_early_platform_driver_probe_id - probe drivers matching class_str and id
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* @class_str: string to identify early platform driver class
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* @id: id to match against
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* @nr_probe: number of platform devices to successfully probe before exiting
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*/
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static int __init sh_early_platform_driver_probe_id(char *class_str,
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int id,
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int nr_probe)
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{
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struct sh_early_platform_driver *epdrv;
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struct platform_device *match;
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int match_id;
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int n = 0;
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int left = 0;
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list_for_each_entry(epdrv, &sh_early_platform_driver_list, list) {
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/* only use drivers matching our class_str */
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if (strcmp(class_str, epdrv->class_str))
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continue;
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if (id == -2) {
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match_id = epdrv->requested_id;
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left = 1;
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} else {
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match_id = id;
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left += sh_early_platform_left(epdrv, id);
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/* skip requested id */
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switch (epdrv->requested_id) {
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case EARLY_PLATFORM_ID_ERROR:
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case EARLY_PLATFORM_ID_UNSET:
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break;
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default:
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if (epdrv->requested_id == id)
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match_id = EARLY_PLATFORM_ID_UNSET;
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}
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}
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switch (match_id) {
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case EARLY_PLATFORM_ID_ERROR:
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pr_warn("%s: unable to parse %s parameter\n",
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class_str, epdrv->pdrv->driver.name);
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fallthrough;
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case EARLY_PLATFORM_ID_UNSET:
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match = NULL;
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break;
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default:
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match = sh_early_platform_match(epdrv, match_id);
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}
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if (match) {
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/*
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* Set up a sensible init_name to enable
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* dev_name() and others to be used before the
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* rest of the driver core is initialized.
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*/
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if (!match->dev.init_name && slab_is_available()) {
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if (match->id != -1)
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match->dev.init_name =
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kasprintf(GFP_KERNEL, "%s.%d",
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match->name,
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match->id);
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else
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match->dev.init_name =
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kasprintf(GFP_KERNEL, "%s",
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match->name);
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if (!match->dev.init_name)
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return -ENOMEM;
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}
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if (epdrv->pdrv->probe(match))
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pr_warn("%s: unable to probe %s early.\n",
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class_str, match->name);
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else
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n++;
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}
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if (n >= nr_probe)
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break;
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}
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if (left)
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return n;
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else
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return -ENODEV;
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}
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/**
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* sh_early_platform_driver_probe - probe a class of registered drivers
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* @class_str: string to identify early platform driver class
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* @nr_probe: number of platform devices to successfully probe before exiting
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* @user_only: only probe user specified early platform devices
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*
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* Used by architecture code to probe registered early platform drivers
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* within a certain class. For probe to happen a registered early platform
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* device matching a registered early platform driver is needed.
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*/
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int __init sh_early_platform_driver_probe(char *class_str,
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int nr_probe,
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int user_only)
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{
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int k, n, i;
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n = 0;
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for (i = -2; n < nr_probe; i++) {
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k = sh_early_platform_driver_probe_id(class_str, i, nr_probe - n);
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if (k < 0)
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break;
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n += k;
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if (user_only)
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break;
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}
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return n;
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}
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/**
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* early_platform_cleanup - clean up early platform code
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*/
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void __init early_platform_cleanup(void)
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{
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struct platform_device *pd, *pd2;
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/* clean up the devres list used to chain devices */
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list_for_each_entry_safe(pd, pd2, &sh_early_platform_device_list,
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dev.devres_head) {
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list_del(&pd->dev.devres_head);
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memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
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}
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}
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