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Date: Mon, 29 Jul 2013 15:14:49 -0500
From: Kumar Gala <galak@...eaurora.org>
To: ohad@...ery.com
Cc: "linux-kernel@...r.kernel.org list" <linux-kernel@...r.kernel.org>,
linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
Jeffrey Hugo <jhugo@...eaurora.org>,
Eric Holmberg <eholmber@...eaurora.org>
Subject: Re: [PATCH] hwspinlock/msm: Add support for Qualcomm MSM HW Mutex block
On Jul 29, 2013, at 3:11 PM, Kumar Gala wrote:
> Add driver for Qualcomm MSM Hardware Mutex block that exists on newer MSM
> SoC (MSM8974, etc).
>
> CC: Jeffrey Hugo <jhugo@...eaurora.org>
> CC: Eric Holmberg <eholmber@...eaurora.org>
> Signed-off-by: Kumar Gala <galak@...eaurora.org>
> ---
[ had old device tree mailing list ]
> .../devicetree/bindings/arm/msm/tcsr-mutex.txt | 20 +++
> drivers/hwspinlock/Kconfig | 11 ++
> drivers/hwspinlock/Makefile | 1 +
> drivers/hwspinlock/msm_hwspinlock.c | 150 +++++++++++++++++++++
> 4 files changed, 182 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/arm/msm/tcsr-mutex.txt
> create mode 100644 drivers/hwspinlock/msm_hwspinlock.c
>
> diff --git a/Documentation/devicetree/bindings/arm/msm/tcsr-mutex.txt b/Documentation/devicetree/bindings/arm/msm/tcsr-mutex.txt
> new file mode 100644
> index 0000000..ddd6889
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/msm/tcsr-mutex.txt
> @@ -0,0 +1,20 @@
> +Qualcomm MSM Hardware Mutex Block:
> +
> +The hardware block provides mutexes utilized between different processors
> +on the SoC as part of the communication protocol used by these processors.
> +
> +Required properties:
> +- compatible: should be "qcom,tcsr-mutex"
> +- reg: Should contain registers location and length of mutex registers
> +- reg-names:
> + "mutex-base" - string to identify mutex registers
> +- qcom,num-locks: the number of locks/mutexes supported
> +
> +Example:
> +
> + qcom,tcsr-mutex@...84000 {
> + compatible = "qcom,tcsr-mutex";
> + reg = <0xfd484000 0x1000>;
> + reg-names = "mutex-base";
> + qcom,num-locks = <32>;
> + };
> diff --git a/drivers/hwspinlock/Kconfig b/drivers/hwspinlock/Kconfig
> index 70637d2..192e939 100644
> --- a/drivers/hwspinlock/Kconfig
> +++ b/drivers/hwspinlock/Kconfig
> @@ -8,6 +8,17 @@ config HWSPINLOCK
>
> menu "Hardware Spinlock drivers"
>
> +config HWSPINLOCK_MSM
> + tristate "MSM Hardware Spinlock device"
> + depends on ARCH_MSM
> + select HWSPINLOCK
> + help
> + Say y here to support the MSM Hardware Mutex functionality, which
> + provides a synchronisation mechanism for the various processors on
> + the SoC.
> +
> + If unsure, say N.
> +
> config HWSPINLOCK_OMAP
> tristate "OMAP Hardware Spinlock device"
> depends on ARCH_OMAP4 || SOC_OMAP5
> diff --git a/drivers/hwspinlock/Makefile b/drivers/hwspinlock/Makefile
> index 93eb64b..4074c56 100644
> --- a/drivers/hwspinlock/Makefile
> +++ b/drivers/hwspinlock/Makefile
> @@ -3,5 +3,6 @@
> #
>
> obj-$(CONFIG_HWSPINLOCK) += hwspinlock_core.o
> +obj-$(CONFIG_HWSPINLOCK_MSM) += msm_hwspinlock.o
> obj-$(CONFIG_HWSPINLOCK_OMAP) += omap_hwspinlock.o
> obj-$(CONFIG_HSEM_U8500) += u8500_hsem.o
> diff --git a/drivers/hwspinlock/msm_hwspinlock.c b/drivers/hwspinlock/msm_hwspinlock.c
> new file mode 100644
> index 0000000..c7d80c5
> --- /dev/null
> +++ b/drivers/hwspinlock/msm_hwspinlock.c
> @@ -0,0 +1,150 @@
> +/*
> + * Copyright (c) 2013, The Linux Foundation. All rights reserved.
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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/err.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/hwspinlock.h>
> +
> +#include <asm/io.h>
> +
> +#include "hwspinlock_internal.h"
> +
> +#define SPINLOCK_ID_APPS_PROC 1
> +#define BASE_ID 0
> +
> +static int msm_hwspinlock_trylock(struct hwspinlock *lock)
> +{
> + void __iomem *lock_addr = lock->priv;
> +
> + writel_relaxed(SPINLOCK_ID_APPS_PROC, lock_addr);
> + smp_mb();
> + return readl_relaxed(lock_addr) == SPINLOCK_ID_APPS_PROC;
> +}
> +
> +static void msm_hwspinlock_unlock(struct hwspinlock *lock)
> +{
> + int lock_owner;
> + void __iomem *lock_addr = lock->priv;
> +
> + lock_owner = readl_relaxed(lock_addr);
> + if (lock_owner != SPINLOCK_ID_APPS_PROC) {
> + pr_err("%s: spinlock not owned by Apps (actual owner is %d)\n",
> + __func__, lock_owner);
> + }
> +
> + writel_relaxed(0, lock_addr);
> + smp_mb();
> +}
> +
> +static const struct hwspinlock_ops msm_hwspinlock_ops = {
> + .trylock = msm_hwspinlock_trylock,
> + .unlock = msm_hwspinlock_unlock,
> +};
> +
> +static struct of_device_id msm_hwspinlock_of_match[];
> +static int msm_hwspinlock_probe(struct platform_device *pdev)
> +{
> + int ret, i, stride;
> + u32 num_locks;
> + struct hwspinlock_device *bank;
> + struct hwspinlock *hwlock;
> + struct resource *res;
> + void __iomem *iobase;
> + struct device_node *node = pdev->dev.of_node;
> + const struct of_device_id *match;
> +
> + match = of_match_device(msm_hwspinlock_of_match, &pdev->dev);
> + if (!match)
> + return -EINVAL;
> +
> + ret = of_property_read_u32(node, "qcom,num-locks", &num_locks);
> + if (ret || (num_locks == 0))
> + return -ENODEV;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mutex-base");
> + iobase = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(iobase))
> + return PTR_ERR(iobase);
> +
> + bank = devm_kzalloc(&pdev->dev,
> + sizeof(*bank) + num_locks * sizeof(*hwlock), 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 = iobase + i * stride;
> +
> + ret = hwspin_lock_register(bank, &pdev->dev, &msm_hwspinlock_ops,
> + BASE_ID, num_locks);
> + return ret;
> +}
> +
> +static int msm_hwspinlock_remove(struct platform_device *pdev)
> +{
> + struct hwspinlock_device *bank = platform_get_drvdata(pdev);
> + int ret;
> +
> + ret = hwspin_lock_unregister(bank);
> + if (ret) {
> + dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static struct of_device_id msm_hwspinlock_of_match[] = {
> + {
> + .compatible = "qcom,tcsr-mutex",
> + .data = (void *)0x80, /* register stride */
> + },
> + { },
> +};
> +
> +static struct platform_driver msm_hwspinlock_driver = {
> + .probe = msm_hwspinlock_probe,
> + .remove = msm_hwspinlock_remove,
> + .driver = {
> + .name = "msm_hwspinlock",
> + .owner = THIS_MODULE,
> + .of_match_table = msm_hwspinlock_of_match,
> + },
> +};
> +
> +static int __init msm_hwspinlock_init(void)
> +{
> + return platform_driver_register(&msm_hwspinlock_driver);
> +}
> +/* board init code might need to reserve hwspinlocks for predefined purposes */
> +postcore_initcall(msm_hwspinlock_init);
> +
> +static void __exit msm_hwspinlock_exit(void)
> +{
> + platform_driver_unregister(&msm_hwspinlock_driver);
> +}
> +module_exit(msm_hwspinlock_exit);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Hardware spinlock driver for MSM");
> +MODULE_AUTHOR("Kumar Gala <galak@...eaurora.org>");
> +MODULE_AUTHOR("Jeffrey Hugo <jhugo@...eaurora.org>");
> +MODULE_AUTHOR("Eric Holmberg <eholmber@...eaurora.org>");
> --
> 1.8.2.1
>
> --
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--
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