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hwspinlock updates for v5.5

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This contains a number of cleanups to the core and several drivers, in
 particular removing the requirement for drivers to implement pm_runtime.
 
 It also udpates the location of the git tree in MAINTAINERS.
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Merge tag 'hwlock-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc

Pull hwspinlock updates from Bjorn Andersson:
 "This contains a number of cleanups to the core and several drivers, in
  particular removing the requirement for drivers to implement
  pm_runtime.

  It also udpates the location of the git tree in MAINTAINERS"

* tag 'hwlock-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc:
  hwspinlock: u8500_hsem: Remove redundant PM runtime implementation
  hwspinlock: sprd: Remove redundant PM runtime implementation
  hwspinlock: Let the PM runtime can be optional
  hwspinlock: Remove BUG_ON() from the hwspinlock core
  hwspinlock: sprd: Use devm_hwspin_lock_register() to register hwlock controller
  hwspinlock: sprd: Use devm_add_action_or_reset() for calls to clk_disable_unprepare()
  hwspinlock: sprd: Check the return value of clk_prepare_enable()
  hwspinlock: sprd: Change to use devm_platform_ioremap_resource()
  hwspinlock: u8500_hsem: Use devm_hwspin_lock_register() to register hwlock controller
  hwspinlock: u8500_hsem: Use devm_kzalloc() to allocate memory
  hwspinlock: u8500_hsem: Change to use devm_platform_ioremap_resource()
  MAINTAINERS: hwspinlock: update git tree location
This commit is contained in:
Linus Torvalds 2019-12-01 18:40:28 -08:00
commit 454d9c4aa7
4 changed files with 42 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
MAINTAINERS
View File

@ -7284,7 +7284,7 @@ M: Ohad Ben-Cohen <ohad@wizery.com>
M: Bjorn Andersson <bjorn.andersson@linaro.org>
L: linux-remoteproc@vger.kernel.org
S: Maintained
T: git git://git.kernel.org/pub/scm/linux/kernel/git/ohad/hwspinlock.git
T: git git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc.git hwspinlock-next
F: Documentation/devicetree/bindings/hwlock/
F: Documentation/hwspinlock.txt
F: drivers/hwspinlock/

16
drivers/hwspinlock/hwspinlock_core.c
View File

@ -92,8 +92,8 @@ int __hwspin_trylock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
{
int ret;
BUG_ON(!hwlock);
BUG_ON(!flags && mode == HWLOCK_IRQSTATE);
if (WARN_ON(!hwlock || (!flags && mode == HWLOCK_IRQSTATE)))
return -EINVAL;
/*
* This spin_lock{_irq, _irqsave} serves three purposes:
@ -264,8 +264,8 @@ EXPORT_SYMBOL_GPL(__hwspin_lock_timeout);
*/
void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
{
BUG_ON(!hwlock);
BUG_ON(!flags && mode == HWLOCK_IRQSTATE);
if (WARN_ON(!hwlock || (!flags && mode == HWLOCK_IRQSTATE)))
return;
/*
* We must make sure that memory operations (both reads and writes),
@ -657,13 +657,15 @@ static int __hwspin_lock_request(struct hwspinlock *hwlock)
/* notify PM core that power is now needed */
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
if (ret < 0 && ret != -EACCES) {
dev_err(dev, "%s: can't power on device\n", __func__);
pm_runtime_put_noidle(dev);
module_put(dev->driver->owner);
return ret;
}
ret = 0;
/* mark hwspinlock as used, should not fail */
tmp = radix_tree_tag_clear(&hwspinlock_tree, hwlock_to_id(hwlock),
HWSPINLOCK_UNUSED);
@ -820,9 +822,7 @@ int hwspin_lock_free(struct hwspinlock *hwlock)
}
/* notify the underlying device that power is not needed */
ret = pm_runtime_put(dev);
if (ret < 0)
goto out;
pm_runtime_put(dev);
/* mark this hwspinlock as available */
tmp = radix_tree_tag_set(&hwspinlock_tree, hwlock_to_id(hwlock),

48
drivers/hwspinlock/sprd_hwspinlock.c
View File

@ -15,7 +15,6 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "hwspinlock_internal.h"
@ -79,11 +78,17 @@ static const struct hwspinlock_ops sprd_hwspinlock_ops = {
.relax = sprd_hwspinlock_relax,
};
static void sprd_hwspinlock_disable(void *data)
{
struct sprd_hwspinlock_dev *sprd_hwlock = data;
clk_disable_unprepare(sprd_hwlock->clk);
}
static int sprd_hwspinlock_probe(struct platform_device *pdev)
{
struct sprd_hwspinlock_dev *sprd_hwlock;
struct hwspinlock *lock;
struct resource *res;
int i, ret;
if (!pdev->dev.of_node)
@ -96,8 +101,7 @@ static int sprd_hwspinlock_probe(struct platform_device *pdev)
if (!sprd_hwlock)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
sprd_hwlock->base = devm_ioremap_resource(&pdev->dev, res);
sprd_hwlock->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(sprd_hwlock->base))
return PTR_ERR(sprd_hwlock->base);
@ -107,7 +111,17 @@ static int sprd_hwspinlock_probe(struct platform_device *pdev)
return PTR_ERR(sprd_hwlock->clk);
}
clk_prepare_enable(sprd_hwlock->clk);
ret = clk_prepare_enable(sprd_hwlock->clk);
if (ret)
return ret;
ret = devm_add_action_or_reset(&pdev->dev, sprd_hwspinlock_disable,
sprd_hwlock);
if (ret) {
dev_err(&pdev->dev,
"Failed to add hwspinlock disable action\n");
return ret;
}
/* set the hwspinlock to record user id to identify subsystems */
writel(HWSPINLOCK_USER_BITS, sprd_hwlock->base + HWSPINLOCK_RECCTRL);
@ -118,27 +132,10 @@ static int sprd_hwspinlock_probe(struct platform_device *pdev)
}
platform_set_drvdata(pdev, sprd_hwlock);
pm_runtime_enable(&pdev->dev);
ret = hwspin_lock_register(&sprd_hwlock->bank, &pdev->dev,
&sprd_hwspinlock_ops, 0, SPRD_HWLOCKS_NUM);
if (ret) {
pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(sprd_hwlock->clk);
return ret;
}
return 0;
}
static int sprd_hwspinlock_remove(struct platform_device *pdev)
{
struct sprd_hwspinlock_dev *sprd_hwlock = platform_get_drvdata(pdev);
hwspin_lock_unregister(&sprd_hwlock->bank);
pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(sprd_hwlock->clk);
return 0;
return devm_hwspin_lock_register(&pdev->dev, &sprd_hwlock->bank,
&sprd_hwspinlock_ops, 0,
SPRD_HWLOCKS_NUM);
}
static const struct of_device_id sprd_hwspinlock_of_match[] = {
@ -149,7 +146,6 @@ MODULE_DEVICE_TABLE(of, sprd_hwspinlock_of_match);
static struct platform_driver sprd_hwspinlock_driver = {
.probe = sprd_hwspinlock_probe,
.remove = sprd_hwspinlock_remove,
.driver = {
.name = "sprd_hwspinlock",
.of_match_table = of_match_ptr(sprd_hwspinlock_of_match),

53
drivers/hwspinlock/u8500_hsem.c
View File

@ -16,7 +16,6 @@
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/hwspinlock.h>
@ -88,21 +87,16 @@ static int u8500_hsem_probe(struct platform_device *pdev)
struct hwspinlock_pdata *pdata = pdev->dev.platform_data;
struct hwspinlock_device *bank;
struct hwspinlock *hwlock;
struct resource *res;
void __iomem *io_base;
int i, ret, num_locks = U8500_MAX_SEMAPHORE;
int i, num_locks = U8500_MAX_SEMAPHORE;
ulong val;
if (!pdata)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
io_base = ioremap(res->start, resource_size(res));
if (!io_base)
return -ENOMEM;
io_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(io_base))
return PTR_ERR(io_base);
/* make sure protocol 1 is selected */
val = readl(io_base + HSEM_CTRL_REG);
@ -111,54 +105,29 @@ static int u8500_hsem_probe(struct platform_device *pdev)
/* clear all interrupts */
writel(0xFFFF, io_base + HSEM_ICRALL);
bank = kzalloc(struct_size(bank, lock, num_locks), GFP_KERNEL);
if (!bank) {
ret = -ENOMEM;
goto iounmap_base;
}
bank = devm_kzalloc(&pdev->dev, struct_size(bank, lock, num_locks),
GFP_KERNEL);
if (!bank)
return -ENOMEM;
platform_set_drvdata(pdev, bank);
for (i = 0, hwlock = &bank->lock[0]; i < num_locks; i++, hwlock++)
hwlock->priv = io_base + HSEM_REGISTER_OFFSET + sizeof(u32) * i;
/* no pm needed for HSem but required to comply with hwspilock core */
pm_runtime_enable(&pdev->dev);
ret = hwspin_lock_register(bank, &pdev->dev, &u8500_hwspinlock_ops,
pdata->base_id, num_locks);
if (ret)
goto reg_fail;
return 0;
reg_fail:
pm_runtime_disable(&pdev->dev);
kfree(bank);
iounmap_base:
iounmap(io_base);
return ret;
return devm_hwspin_lock_register(&pdev->dev, bank,
&u8500_hwspinlock_ops,
pdata->base_id, num_locks);
}
static int u8500_hsem_remove(struct platform_device *pdev)
{
struct hwspinlock_device *bank = platform_get_drvdata(pdev);
void __iomem *io_base = bank->lock[0].priv - HSEM_REGISTER_OFFSET;
int ret;
/* clear all interrupts */
writel(0xFFFF, io_base + HSEM_ICRALL);
ret = hwspin_lock_unregister(bank);
if (ret) {
dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret);
return ret;
}
pm_runtime_disable(&pdev->dev);
iounmap(io_base);
kfree(bank);
return 0;
}