mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 17:54:13 +08:00
b2e3c4319d
Driver updates for ARM SoCs. A handful of driver changes this time around. The larger changes are: - Reset drivers for hi3660 and zx2967 - AHCI driver for Davinci, acked by Tejun and brought in here due to platform dependencies - Cleanups of atmel-ebi (External Bus Interface) - Tweaks for Rockchip GRF (General Register File) usage (kitchensink misc register range on the SoCs) - PM domains changes for support of two new ZTE SoCs (zx296718 and zx2967) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJYrM7/AAoJEIwa5zzehBx3qisP/18NwvbYvC3rMza7k+TEU66n vuEF9KW5GhUpQPbNIsTer5qHhC7ZgL7RoR/H7mpZcCxfhYiNXuUaOv8TMGK+WTLQ HH6QTs4mARLh1IrRcog1hoElzzqMVxaQgODeaaG1DcPvTqHWsQurbXsf17tCQOri nWKyxFpLNlu0kktkGb5JWrM4XBjU9KsW7LME9H86wG8HmB6+mcT5ddeYwW5nD8cG txXgmMjdTEKcpbeTg3cAzL4504auhIl4R9uK+8dc1sw+e9T0nXNDS9IkmLPwWtSR u8q6zQ3zReoDw4jGUgPP0ILHudfQsiMdWS+P2hw/krpbtLlQ+irHDVa1VA3NLiUT 9aG9cNTYRMo3ct22YEeWsnAC04XOxpCsqHTR+UWuZaBmf3eoMIXnsafTuwLzqKlQ Ent/4eFPInMAzDH8Kaf1Hh0918qkgF2bNlshem11TccQKvHP+qCoHk6mKGxwEj5k E1UEG4S6k6zNqjLwmTBBbk8sLMl/WVo6RMSMz+JflatgPmVZco4EX2O73iKGAJVU 5GfHIUG9Yl4+aTIUORu59cWxOCApK0kqERrFKe412BMurXlLfqVcr/H2tiiuWnn1 cEJ9d+uBd8IxTIQX0iEYGUAkX97mhxGUYdqGQuGJSV+MOfWX1zNP1sI4EscLGKQj sDDZScCaguM4xE20Jum1 =od7u -----END PGP SIGNATURE----- Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC driver updates from Arnd Bergmann: "Driver updates for ARM SoCs. A handful of driver changes this time around. The larger changes are: - Reset drivers for hi3660 and zx2967 - AHCI driver for Davinci, acked by Tejun and brought in here due to platform dependencies - Cleanups of atmel-ebi (External Bus Interface) - Tweaks for Rockchip GRF (General Register File) usage (kitchensink misc register range on the SoCs) - PM domains changes for support of two new ZTE SoCs (zx296718 and zx2967)" * tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (53 commits) soc: samsung: pmu: Add register defines for pad retention control reset: make zx2967 explicitly non-modular reset: core: fix reset_control_put soc: samsung: pm_domains: Read domain name from the new label property soc: samsung: pm_domains: Remove message about failed memory allocation soc: samsung: pm_domains: Remove unused name field soc: samsung: pm_domains: Use full names in subdomains registration log sata: ahci-da850: un-hardcode the MPY bits sata: ahci-da850: add a workaround for controller instability sata: ahci: export ahci_do_hardreset() locally sata: ahci-da850: implement a workaround for the softreset quirk sata: ahci-da850: add device tree match table sata: ahci-da850: get the sata clock using a connection id soc: samsung: pmu: Remove duplicated define for ARM_L2_OPTION register memory: atmel-ebi: Enable the SMC clock if specified soc: samsung: pmu: Remove unused and duplicated defines memory: atmel-ebi: Properly handle multiple reference to the same CS memory: atmel-ebi: Fix the test to enable generic SMC logic soc: samsung: pm_domains: Add new Exynos5433 compatible soc: samsung: pmu: Add dummy support for Exynos5433 SoC ...
458 lines
11 KiB
C
458 lines
11 KiB
C
/*
|
|
* Reset Controller framework
|
|
*
|
|
* Copyright 2013 Philipp Zabel, Pengutronix
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
#include <linux/atomic.h>
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/export.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/reset.h>
|
|
#include <linux/reset-controller.h>
|
|
#include <linux/slab.h>
|
|
|
|
static DEFINE_MUTEX(reset_list_mutex);
|
|
static LIST_HEAD(reset_controller_list);
|
|
|
|
/**
|
|
* struct reset_control - a reset control
|
|
* @rcdev: a pointer to the reset controller device
|
|
* this reset control belongs to
|
|
* @list: list entry for the rcdev's reset controller list
|
|
* @id: ID of the reset controller in the reset
|
|
* controller device
|
|
* @refcnt: Number of gets of this reset_control
|
|
* @shared: Is this a shared (1), or an exclusive (0) reset_control?
|
|
* @deassert_cnt: Number of times this reset line has been deasserted
|
|
* @triggered_count: Number of times this reset line has been reset. Currently
|
|
* only used for shared resets, which means that the value
|
|
* will be either 0 or 1.
|
|
*/
|
|
struct reset_control {
|
|
struct reset_controller_dev *rcdev;
|
|
struct list_head list;
|
|
unsigned int id;
|
|
unsigned int refcnt;
|
|
bool shared;
|
|
atomic_t deassert_count;
|
|
atomic_t triggered_count;
|
|
};
|
|
|
|
/**
|
|
* of_reset_simple_xlate - translate reset_spec to the reset line number
|
|
* @rcdev: a pointer to the reset controller device
|
|
* @reset_spec: reset line specifier as found in the device tree
|
|
* @flags: a flags pointer to fill in (optional)
|
|
*
|
|
* This simple translation function should be used for reset controllers
|
|
* with 1:1 mapping, where reset lines can be indexed by number without gaps.
|
|
*/
|
|
static int of_reset_simple_xlate(struct reset_controller_dev *rcdev,
|
|
const struct of_phandle_args *reset_spec)
|
|
{
|
|
if (reset_spec->args[0] >= rcdev->nr_resets)
|
|
return -EINVAL;
|
|
|
|
return reset_spec->args[0];
|
|
}
|
|
|
|
/**
|
|
* reset_controller_register - register a reset controller device
|
|
* @rcdev: a pointer to the initialized reset controller device
|
|
*/
|
|
int reset_controller_register(struct reset_controller_dev *rcdev)
|
|
{
|
|
if (!rcdev->of_xlate) {
|
|
rcdev->of_reset_n_cells = 1;
|
|
rcdev->of_xlate = of_reset_simple_xlate;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&rcdev->reset_control_head);
|
|
|
|
mutex_lock(&reset_list_mutex);
|
|
list_add(&rcdev->list, &reset_controller_list);
|
|
mutex_unlock(&reset_list_mutex);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(reset_controller_register);
|
|
|
|
/**
|
|
* reset_controller_unregister - unregister a reset controller device
|
|
* @rcdev: a pointer to the reset controller device
|
|
*/
|
|
void reset_controller_unregister(struct reset_controller_dev *rcdev)
|
|
{
|
|
mutex_lock(&reset_list_mutex);
|
|
list_del(&rcdev->list);
|
|
mutex_unlock(&reset_list_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(reset_controller_unregister);
|
|
|
|
static void devm_reset_controller_release(struct device *dev, void *res)
|
|
{
|
|
reset_controller_unregister(*(struct reset_controller_dev **)res);
|
|
}
|
|
|
|
/**
|
|
* devm_reset_controller_register - resource managed reset_controller_register()
|
|
* @dev: device that is registering this reset controller
|
|
* @rcdev: a pointer to the initialized reset controller device
|
|
*
|
|
* Managed reset_controller_register(). For reset controllers registered by
|
|
* this function, reset_controller_unregister() is automatically called on
|
|
* driver detach. See reset_controller_register() for more information.
|
|
*/
|
|
int devm_reset_controller_register(struct device *dev,
|
|
struct reset_controller_dev *rcdev)
|
|
{
|
|
struct reset_controller_dev **rcdevp;
|
|
int ret;
|
|
|
|
rcdevp = devres_alloc(devm_reset_controller_release, sizeof(*rcdevp),
|
|
GFP_KERNEL);
|
|
if (!rcdevp)
|
|
return -ENOMEM;
|
|
|
|
ret = reset_controller_register(rcdev);
|
|
if (!ret) {
|
|
*rcdevp = rcdev;
|
|
devres_add(dev, rcdevp);
|
|
} else {
|
|
devres_free(rcdevp);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_reset_controller_register);
|
|
|
|
/**
|
|
* reset_control_reset - reset the controlled device
|
|
* @rstc: reset controller
|
|
*
|
|
* On a shared reset line the actual reset pulse is only triggered once for the
|
|
* lifetime of the reset_control instance: for all but the first caller this is
|
|
* a no-op.
|
|
* Consumers must not use reset_control_(de)assert on shared reset lines when
|
|
* reset_control_reset has been used.
|
|
*
|
|
* If rstc is NULL it is an optional reset and the function will just
|
|
* return 0.
|
|
*/
|
|
int reset_control_reset(struct reset_control *rstc)
|
|
{
|
|
int ret;
|
|
|
|
if (!rstc)
|
|
return 0;
|
|
|
|
if (WARN_ON(IS_ERR(rstc)))
|
|
return -EINVAL;
|
|
|
|
if (!rstc->rcdev->ops->reset)
|
|
return -ENOTSUPP;
|
|
|
|
if (rstc->shared) {
|
|
if (WARN_ON(atomic_read(&rstc->deassert_count) != 0))
|
|
return -EINVAL;
|
|
|
|
if (atomic_inc_return(&rstc->triggered_count) != 1)
|
|
return 0;
|
|
}
|
|
|
|
ret = rstc->rcdev->ops->reset(rstc->rcdev, rstc->id);
|
|
if (rstc->shared && ret)
|
|
atomic_dec(&rstc->triggered_count);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(reset_control_reset);
|
|
|
|
/**
|
|
* reset_control_assert - asserts the reset line
|
|
* @rstc: reset controller
|
|
*
|
|
* Calling this on an exclusive reset controller guarantees that the reset
|
|
* will be asserted. When called on a shared reset controller the line may
|
|
* still be deasserted, as long as other users keep it so.
|
|
*
|
|
* For shared reset controls a driver cannot expect the hw's registers and
|
|
* internal state to be reset, but must be prepared for this to happen.
|
|
* Consumers must not use reset_control_reset on shared reset lines when
|
|
* reset_control_(de)assert has been used.
|
|
* return 0.
|
|
*
|
|
* If rstc is NULL it is an optional reset and the function will just
|
|
* return 0.
|
|
*/
|
|
int reset_control_assert(struct reset_control *rstc)
|
|
{
|
|
if (!rstc)
|
|
return 0;
|
|
|
|
if (WARN_ON(IS_ERR(rstc)))
|
|
return -EINVAL;
|
|
|
|
if (!rstc->rcdev->ops->assert)
|
|
return -ENOTSUPP;
|
|
|
|
if (rstc->shared) {
|
|
if (WARN_ON(atomic_read(&rstc->triggered_count) != 0))
|
|
return -EINVAL;
|
|
|
|
if (WARN_ON(atomic_read(&rstc->deassert_count) == 0))
|
|
return -EINVAL;
|
|
|
|
if (atomic_dec_return(&rstc->deassert_count) != 0)
|
|
return 0;
|
|
}
|
|
|
|
return rstc->rcdev->ops->assert(rstc->rcdev, rstc->id);
|
|
}
|
|
EXPORT_SYMBOL_GPL(reset_control_assert);
|
|
|
|
/**
|
|
* reset_control_deassert - deasserts the reset line
|
|
* @rstc: reset controller
|
|
*
|
|
* After calling this function, the reset is guaranteed to be deasserted.
|
|
* Consumers must not use reset_control_reset on shared reset lines when
|
|
* reset_control_(de)assert has been used.
|
|
* return 0.
|
|
*
|
|
* If rstc is NULL it is an optional reset and the function will just
|
|
* return 0.
|
|
*/
|
|
int reset_control_deassert(struct reset_control *rstc)
|
|
{
|
|
if (!rstc)
|
|
return 0;
|
|
|
|
if (WARN_ON(IS_ERR(rstc)))
|
|
return -EINVAL;
|
|
|
|
if (!rstc->rcdev->ops->deassert)
|
|
return -ENOTSUPP;
|
|
|
|
if (rstc->shared) {
|
|
if (WARN_ON(atomic_read(&rstc->triggered_count) != 0))
|
|
return -EINVAL;
|
|
|
|
if (atomic_inc_return(&rstc->deassert_count) != 1)
|
|
return 0;
|
|
}
|
|
|
|
return rstc->rcdev->ops->deassert(rstc->rcdev, rstc->id);
|
|
}
|
|
EXPORT_SYMBOL_GPL(reset_control_deassert);
|
|
|
|
/**
|
|
* reset_control_status - returns a negative errno if not supported, a
|
|
* positive value if the reset line is asserted, or zero if the reset
|
|
* line is not asserted or if the desc is NULL (optional reset).
|
|
* @rstc: reset controller
|
|
*/
|
|
int reset_control_status(struct reset_control *rstc)
|
|
{
|
|
if (!rstc)
|
|
return 0;
|
|
|
|
if (WARN_ON(IS_ERR(rstc)))
|
|
return -EINVAL;
|
|
|
|
if (rstc->rcdev->ops->status)
|
|
return rstc->rcdev->ops->status(rstc->rcdev, rstc->id);
|
|
|
|
return -ENOTSUPP;
|
|
}
|
|
EXPORT_SYMBOL_GPL(reset_control_status);
|
|
|
|
static struct reset_control *__reset_control_get(
|
|
struct reset_controller_dev *rcdev,
|
|
unsigned int index, bool shared)
|
|
{
|
|
struct reset_control *rstc;
|
|
|
|
lockdep_assert_held(&reset_list_mutex);
|
|
|
|
list_for_each_entry(rstc, &rcdev->reset_control_head, list) {
|
|
if (rstc->id == index) {
|
|
if (WARN_ON(!rstc->shared || !shared))
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
rstc->refcnt++;
|
|
return rstc;
|
|
}
|
|
}
|
|
|
|
rstc = kzalloc(sizeof(*rstc), GFP_KERNEL);
|
|
if (!rstc)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
try_module_get(rcdev->owner);
|
|
|
|
rstc->rcdev = rcdev;
|
|
list_add(&rstc->list, &rcdev->reset_control_head);
|
|
rstc->id = index;
|
|
rstc->refcnt = 1;
|
|
rstc->shared = shared;
|
|
|
|
return rstc;
|
|
}
|
|
|
|
static void __reset_control_put(struct reset_control *rstc)
|
|
{
|
|
lockdep_assert_held(&reset_list_mutex);
|
|
|
|
if (--rstc->refcnt)
|
|
return;
|
|
|
|
module_put(rstc->rcdev->owner);
|
|
|
|
list_del(&rstc->list);
|
|
kfree(rstc);
|
|
}
|
|
|
|
struct reset_control *__of_reset_control_get(struct device_node *node,
|
|
const char *id, int index, bool shared,
|
|
bool optional)
|
|
{
|
|
struct reset_control *rstc;
|
|
struct reset_controller_dev *r, *rcdev;
|
|
struct of_phandle_args args;
|
|
int rstc_id;
|
|
int ret;
|
|
|
|
if (!node)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (id) {
|
|
index = of_property_match_string(node,
|
|
"reset-names", id);
|
|
if (index == -EILSEQ)
|
|
return ERR_PTR(index);
|
|
if (index < 0)
|
|
return optional ? NULL : ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
|
|
index, &args);
|
|
if (ret == -EINVAL)
|
|
return ERR_PTR(ret);
|
|
if (ret)
|
|
return optional ? NULL : ERR_PTR(ret);
|
|
|
|
mutex_lock(&reset_list_mutex);
|
|
rcdev = NULL;
|
|
list_for_each_entry(r, &reset_controller_list, list) {
|
|
if (args.np == r->of_node) {
|
|
rcdev = r;
|
|
break;
|
|
}
|
|
}
|
|
of_node_put(args.np);
|
|
|
|
if (!rcdev) {
|
|
mutex_unlock(&reset_list_mutex);
|
|
return ERR_PTR(-EPROBE_DEFER);
|
|
}
|
|
|
|
if (WARN_ON(args.args_count != rcdev->of_reset_n_cells)) {
|
|
mutex_unlock(&reset_list_mutex);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
rstc_id = rcdev->of_xlate(rcdev, &args);
|
|
if (rstc_id < 0) {
|
|
mutex_unlock(&reset_list_mutex);
|
|
return ERR_PTR(rstc_id);
|
|
}
|
|
|
|
/* reset_list_mutex also protects the rcdev's reset_control list */
|
|
rstc = __reset_control_get(rcdev, rstc_id, shared);
|
|
|
|
mutex_unlock(&reset_list_mutex);
|
|
|
|
return rstc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__of_reset_control_get);
|
|
|
|
/**
|
|
* reset_control_put - free the reset controller
|
|
* @rstc: reset controller
|
|
*/
|
|
|
|
void reset_control_put(struct reset_control *rstc)
|
|
{
|
|
if (IS_ERR_OR_NULL(rstc))
|
|
return;
|
|
|
|
mutex_lock(&reset_list_mutex);
|
|
__reset_control_put(rstc);
|
|
mutex_unlock(&reset_list_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(reset_control_put);
|
|
|
|
static void devm_reset_control_release(struct device *dev, void *res)
|
|
{
|
|
reset_control_put(*(struct reset_control **)res);
|
|
}
|
|
|
|
struct reset_control *__devm_reset_control_get(struct device *dev,
|
|
const char *id, int index, bool shared,
|
|
bool optional)
|
|
{
|
|
struct reset_control **ptr, *rstc;
|
|
|
|
ptr = devres_alloc(devm_reset_control_release, sizeof(*ptr),
|
|
GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
rstc = __of_reset_control_get(dev ? dev->of_node : NULL,
|
|
id, index, shared, optional);
|
|
if (!IS_ERR(rstc)) {
|
|
*ptr = rstc;
|
|
devres_add(dev, ptr);
|
|
} else {
|
|
devres_free(ptr);
|
|
}
|
|
|
|
return rstc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__devm_reset_control_get);
|
|
|
|
/**
|
|
* device_reset - find reset controller associated with the device
|
|
* and perform reset
|
|
* @dev: device to be reset by the controller
|
|
*
|
|
* Convenience wrapper for reset_control_get() and reset_control_reset().
|
|
* This is useful for the common case of devices with single, dedicated reset
|
|
* lines.
|
|
*/
|
|
int device_reset(struct device *dev)
|
|
{
|
|
struct reset_control *rstc;
|
|
int ret;
|
|
|
|
rstc = reset_control_get(dev, NULL);
|
|
if (IS_ERR(rstc))
|
|
return PTR_ERR(rstc);
|
|
|
|
ret = reset_control_reset(rstc);
|
|
|
|
reset_control_put(rstc);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_reset);
|