diff options
| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2019-10-03 11:29:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-07 13:50:47 +0200 |
| commit | 507fd01d5333338753a1cc26322dfc9f856c109f (patch) | |
| tree | 1c15e4d8e2be9ae306d0c72f165357eace49df9e /arch/sh/include | |
| parent | d4387cd117414ba80230f27a514be5ca4a09cfcc (diff) | |
drivers: move the early platform device support to arch/sh
SuperH is the only user of the current implementation of early platform
device support. We want to introduce a more robust approach to early
probing. As the first step - move all the current early platform code
to arch/sh.
In order not to export internal drivers/base functions to arch code for
this temporary solution - copy the two needed routines for driver
matching from drivers/base/platform.c to arch/sh/drivers/platform_early.c.
Also: call early_platform_cleanup() from subsys_initcall() so that it's
called after all early devices are probed.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Rich Felker <dalias@libc.org>
Link: https://lore.kernel.org/r/20191003092913.10731-2-brgl@bgdev.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/sh/include')
| -rw-r--r-- | arch/sh/include/asm/platform_early.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/sh/include/asm/platform_early.h b/arch/sh/include/asm/platform_early.h new file mode 100644 index 000000000000..4590ab757d5f --- /dev/null +++ b/arch/sh/include/asm/platform_early.h @@ -0,0 +1,61 @@ +/* SPDX--License-Identifier: GPL-2.0 */ + +#ifndef __PLATFORM_EARLY__ +#define __PLATFORM_EARLY__ + +#include <linux/types.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> + +struct early_platform_driver { + const char *class_str; + struct platform_driver *pdrv; + struct list_head list; + int requested_id; + char *buffer; + int bufsize; +}; + +#define EARLY_PLATFORM_ID_UNSET -2 +#define EARLY_PLATFORM_ID_ERROR -3 + +extern int early_platform_driver_register(struct early_platform_driver *epdrv, + char *buf); +extern void early_platform_add_devices(struct platform_device **devs, int num); + +static inline int is_early_platform_device(struct platform_device *pdev) +{ + return !pdev->dev.driver; +} + +extern void early_platform_driver_register_all(char *class_str); +extern int early_platform_driver_probe(char *class_str, + int nr_probe, int user_only); + +#define early_platform_init(class_string, platdrv) \ + early_platform_init_buffer(class_string, platdrv, NULL, 0) + +#ifndef MODULE +#define early_platform_init_buffer(class_string, platdrv, buf, bufsiz) \ +static __initdata struct early_platform_driver early_driver = { \ + .class_str = class_string, \ + .buffer = buf, \ + .bufsize = bufsiz, \ + .pdrv = platdrv, \ + .requested_id = EARLY_PLATFORM_ID_UNSET, \ +}; \ +static int __init early_platform_driver_setup_func(char *buffer) \ +{ \ + return early_platform_driver_register(&early_driver, buffer); \ +} \ +early_param(class_string, early_platform_driver_setup_func) +#else /* MODULE */ +#define early_platform_init_buffer(class_string, platdrv, buf, bufsiz) \ +static inline char *early_platform_driver_setup_func(void) \ +{ \ + return bufsiz ? buf : NULL; \ +} +#endif /* MODULE */ + +#endif /* __PLATFORM_EARLY__ */ |