hwspinlock updates for v4.13
This introduces a driver for the Spreadtrum hardware spinlock device and cleans up the Kconfig file. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJZXXheAAoJEAsfOT8Nma3Fy1cP/238E4FI3VNUY+AKYBZyHOV+ 38FZRqAG9BGtv5crH6TNCFiQNpP7aFidu9tKmYqHykHCMfJFEyKXprHd2mPAOq2h fat82w6SS9caXdtDhzw+OEzn17xFqAiybydXJ+RrqEVSkXfm69r9/apjvgIXdZeZ SVPab1ofInLEAPkci6lD+XrIzbc1+N/+sO5ZBEGPWVShdbBupIIkJpV0UsNQJOuO mzDn4bjl+EhXxMK3v7JfZ/kRtenBBzj/qYn2Mm/6g8Ytoui0GDQUlyrkTz8A3XQ8 JSxluzWnNAtc4AFXkctsoGe6CsOOiSKHoQEIa2/FV/XwRaU8MZpY7ofLuLwOHmDP H/qAIsl9cXBGNBuXZ5HEB4BzqtsgfwpBcFaWX0zFdVFDlwznd11R6IxJIPdZ13xp z30toStxKvUy1iH9K4iiekvvbdNN1atytbnQakpW6vJisevFdST6ceDFbjWaAFoL O+mnFWeV3aRMRtDxJWI1IiDUJ6GS0O9rTHqKoRqHH69lrm8RTMMG6eMLFmD9U5qM QfjwITQecrqVntAK+667I6U3oTCGLiIttm7kSDDFAcH2yn9n4TmP5WYLZvO9EoLH Mf5uEev060mUJAXfibbWC6Gp9dmRH0M7zw2jTx1FbmST+8s8kGS12d3pY9eBkJk2 oIXLPY5Gf9D2vs0Ov9bT =YiJ+ -----END PGP SIGNATURE----- Merge tag 'hwlock-v4.13' of git://github.com/andersson/remoteproc Pull hwspinlock updates from Bjorn Andersson: "This introduces a driver for the Spreadtrum hardware spinlock device and cleans up the Kconfig file" * tag 'hwlock-v4.13' of git://github.com/andersson/remoteproc: DT: hwspinlock: Add binding documentation for Spreadtrum hwspinlock hwspinlock: sprd: Add hardware spinlock driver Make HWSPINLOCK a menuconfig to ease disabling
This commit is contained in:
commit
e0f25a3f2d
23
Documentation/devicetree/bindings/hwlock/sprd-hwspinlock.txt
Normal file
23
Documentation/devicetree/bindings/hwlock/sprd-hwspinlock.txt
Normal file
|
@ -0,0 +1,23 @@
|
|||
SPRD Hardware Spinlock Device Binding
|
||||
-------------------------------------
|
||||
|
||||
Required properties :
|
||||
- compatible : should be "sprd,hwspinlock-r3p0".
|
||||
- reg : the register address of hwspinlock.
|
||||
- #hwlock-cells : hwlock users only use the hwlock id to represent a specific
|
||||
hwlock, so the number of cells should be <1> here.
|
||||
- clock-names : Must contain "enable".
|
||||
- clocks : Must contain a phandle entry for the clock in clock-names, see the
|
||||
common clock bindings.
|
||||
|
||||
Please look at the generic hwlock binding for usage information for consumers,
|
||||
"Documentation/devicetree/bindings/hwlock/hwlock.txt"
|
||||
|
||||
Example of hwlock provider:
|
||||
hwspinlock@40500000 {
|
||||
compatible = "sprd,hwspinlock-r3p0";
|
||||
reg = <0 0x40500000 0 0x1000>;
|
||||
#hwlock-cells = <1>;
|
||||
clock-names = "enable";
|
||||
clocks = <&clk_aon_apb_gates0 22>;
|
||||
};
|
|
@ -2,16 +2,13 @@
|
|||
# Generic HWSPINLOCK framework
|
||||
#
|
||||
|
||||
# HWSPINLOCK always gets selected by whoever wants it.
|
||||
config HWSPINLOCK
|
||||
tristate
|
||||
|
||||
menu "Hardware Spinlock drivers"
|
||||
menuconfig HWSPINLOCK
|
||||
tristate "Hardware Spinlock drivers"
|
||||
|
||||
config HWSPINLOCK_OMAP
|
||||
tristate "OMAP Hardware Spinlock device"
|
||||
depends on HWSPINLOCK
|
||||
depends on ARCH_OMAP4 || SOC_OMAP5 || SOC_DRA7XX || SOC_AM33XX || SOC_AM43XX
|
||||
select HWSPINLOCK
|
||||
help
|
||||
Say y here to support the OMAP Hardware Spinlock device (firstly
|
||||
introduced in OMAP4).
|
||||
|
@ -20,8 +17,8 @@ config HWSPINLOCK_OMAP
|
|||
|
||||
config HWSPINLOCK_QCOM
|
||||
tristate "Qualcomm Hardware Spinlock device"
|
||||
depends on HWSPINLOCK
|
||||
depends on ARCH_QCOM
|
||||
select HWSPINLOCK
|
||||
select MFD_SYSCON
|
||||
help
|
||||
Say y here to support the Qualcomm Hardware Mutex functionality, which
|
||||
|
@ -32,8 +29,8 @@ config HWSPINLOCK_QCOM
|
|||
|
||||
config HWSPINLOCK_SIRF
|
||||
tristate "SIRF Hardware Spinlock device"
|
||||
depends on HWSPINLOCK
|
||||
depends on ARCH_SIRF
|
||||
select HWSPINLOCK
|
||||
help
|
||||
Say y here to support the SIRF Hardware Spinlock device, which
|
||||
provides a synchronisation mechanism for the various processors
|
||||
|
@ -42,15 +39,22 @@ config HWSPINLOCK_SIRF
|
|||
It's safe to say n here if you're not interested in SIRF hardware
|
||||
spinlock or just want a bare minimum kernel.
|
||||
|
||||
config HWSPINLOCK_SPRD
|
||||
tristate "SPRD Hardware Spinlock device"
|
||||
depends on ARCH_SPRD
|
||||
depends on HWSPINLOCK
|
||||
help
|
||||
Say y here to support the SPRD Hardware Spinlock device.
|
||||
|
||||
If unsure, say N.
|
||||
|
||||
config HSEM_U8500
|
||||
tristate "STE Hardware Semaphore functionality"
|
||||
depends on HWSPINLOCK
|
||||
depends on ARCH_U8500
|
||||
select HWSPINLOCK
|
||||
help
|
||||
Say y here to support the STE Hardware Semaphore functionality, which
|
||||
provides a synchronisation mechanism for the various processor on the
|
||||
SoC.
|
||||
|
||||
If unsure, say N.
|
||||
|
||||
endmenu
|
||||
|
|
|
@ -6,4 +6,5 @@ obj-$(CONFIG_HWSPINLOCK) += hwspinlock_core.o
|
|||
obj-$(CONFIG_HWSPINLOCK_OMAP) += omap_hwspinlock.o
|
||||
obj-$(CONFIG_HWSPINLOCK_QCOM) += qcom_hwspinlock.o
|
||||
obj-$(CONFIG_HWSPINLOCK_SIRF) += sirf_hwspinlock.o
|
||||
obj-$(CONFIG_HWSPINLOCK_SPRD) += sprd_hwspinlock.o
|
||||
obj-$(CONFIG_HSEM_U8500) += u8500_hsem.o
|
||||
|
|
183
drivers/hwspinlock/sprd_hwspinlock.c
Normal file
183
drivers/hwspinlock/sprd_hwspinlock.c
Normal file
|
@ -0,0 +1,183 @@
|
|||
/*
|
||||
* Spreadtrum hardware spinlock driver
|
||||
* Copyright (C) 2017 Spreadtrum - http://www.spreadtrum.com
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*/
|
||||
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/hwspinlock.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#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"
|
||||
|
||||
/* hwspinlock registers definition */
|
||||
#define HWSPINLOCK_RECCTRL 0x4
|
||||
#define HWSPINLOCK_MASTERID(_X_) (0x80 + 0x4 * (_X_))
|
||||
#define HWSPINLOCK_TOKEN(_X_) (0x800 + 0x4 * (_X_))
|
||||
|
||||
/* unlocked value */
|
||||
#define HWSPINLOCK_NOTTAKEN 0x55aa10c5
|
||||
/* bits definition of RECCTRL reg */
|
||||
#define HWSPINLOCK_USER_BITS 0x1
|
||||
|
||||
/* hwspinlock number */
|
||||
#define SPRD_HWLOCKS_NUM 32
|
||||
|
||||
struct sprd_hwspinlock_dev {
|
||||
void __iomem *base;
|
||||
struct clk *clk;
|
||||
struct hwspinlock_device bank;
|
||||
};
|
||||
|
||||
/* try to lock the hardware spinlock */
|
||||
static int sprd_hwspinlock_trylock(struct hwspinlock *lock)
|
||||
{
|
||||
struct sprd_hwspinlock_dev *sprd_hwlock =
|
||||
dev_get_drvdata(lock->bank->dev);
|
||||
void __iomem *addr = lock->priv;
|
||||
int user_id, lock_id;
|
||||
|
||||
if (!readl(addr))
|
||||
return 1;
|
||||
|
||||
lock_id = hwlock_to_id(lock);
|
||||
/* get the hardware spinlock master/user id */
|
||||
user_id = readl(sprd_hwlock->base + HWSPINLOCK_MASTERID(lock_id));
|
||||
dev_warn(sprd_hwlock->bank.dev,
|
||||
"hwspinlock [%d] lock failed and master/user id = %d!\n",
|
||||
lock_id, user_id);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* unlock the hardware spinlock */
|
||||
static void sprd_hwspinlock_unlock(struct hwspinlock *lock)
|
||||
{
|
||||
void __iomem *lock_addr = lock->priv;
|
||||
|
||||
writel(HWSPINLOCK_NOTTAKEN, lock_addr);
|
||||
}
|
||||
|
||||
/* The specs recommended below number as the retry delay time */
|
||||
static void sprd_hwspinlock_relax(struct hwspinlock *lock)
|
||||
{
|
||||
ndelay(10);
|
||||
}
|
||||
|
||||
static const struct hwspinlock_ops sprd_hwspinlock_ops = {
|
||||
.trylock = sprd_hwspinlock_trylock,
|
||||
.unlock = sprd_hwspinlock_unlock,
|
||||
.relax = sprd_hwspinlock_relax,
|
||||
};
|
||||
|
||||
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)
|
||||
return -ENODEV;
|
||||
|
||||
sprd_hwlock = devm_kzalloc(&pdev->dev,
|
||||
sizeof(struct sprd_hwspinlock_dev) +
|
||||
SPRD_HWLOCKS_NUM * sizeof(*lock),
|
||||
GFP_KERNEL);
|
||||
if (!sprd_hwlock)
|
||||
return -ENOMEM;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
sprd_hwlock->base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(sprd_hwlock->base))
|
||||
return PTR_ERR(sprd_hwlock->base);
|
||||
|
||||
sprd_hwlock->clk = devm_clk_get(&pdev->dev, "enable");
|
||||
if (IS_ERR(sprd_hwlock->clk)) {
|
||||
dev_err(&pdev->dev, "get hwspinlock clock failed!\n");
|
||||
return PTR_ERR(sprd_hwlock->clk);
|
||||
}
|
||||
|
||||
clk_prepare_enable(sprd_hwlock->clk);
|
||||
|
||||
/* set the hwspinlock to record user id to identify subsystems */
|
||||
writel(HWSPINLOCK_USER_BITS, sprd_hwlock->base + HWSPINLOCK_RECCTRL);
|
||||
|
||||
for (i = 0; i < SPRD_HWLOCKS_NUM; i++) {
|
||||
lock = &sprd_hwlock->bank.lock[i];
|
||||
lock->priv = sprd_hwlock->base + HWSPINLOCK_TOKEN(i);
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
static const struct of_device_id sprd_hwspinlock_of_match[] = {
|
||||
{ .compatible = "sprd,hwspinlock-r3p0", },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
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),
|
||||
},
|
||||
};
|
||||
|
||||
static int __init sprd_hwspinlock_init(void)
|
||||
{
|
||||
return platform_driver_register(&sprd_hwspinlock_driver);
|
||||
}
|
||||
postcore_initcall(sprd_hwspinlock_init);
|
||||
|
||||
static void __exit sprd_hwspinlock_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&sprd_hwspinlock_driver);
|
||||
}
|
||||
module_exit(sprd_hwspinlock_exit);
|
||||
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("Hardware spinlock driver for Spreadtrum");
|
||||
MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
|
||||
MODULE_AUTHOR("Lanqing Liu <lanqing.liu@spreadtrum.com>");
|
||||
MODULE_AUTHOR("Long Cheng <aiden.cheng@spreadtrum.com>");
|
Loading…
Reference in a new issue