From: Kumar Gala <galak@xxxxxxxxxxxxxx> Add driver for Qualcomm Hardware Mutex block that exists on newer Qualcomm SoCs. Signed-off-by: Kumar Gala <galak@xxxxxxxxxxxxxx> [bjorn: added pm_runtime calls, from Courtney, added sfpb-mutex compatible, updated DT binding documentation formatting, replaced msm prefix with qcom, cleaned up includes] Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx> --- We need this driver to add support for the shared memory manager, so I'm reviving Kumars patch from a year ago, with some additional sprinkles on top. Changes since v4: - Aligned with devicetree support in hwlock framework and hence depends on [1] Changes since v3: - Reverted back to getting stride from of_match, per Kumars request Changes since v2: - MODULE_DEVICE_TABLE - Changed prefix to qcom - Cleaned up includes - Rely on reg and num-locks to figure out stride, instead of of_match data Changes since v1: - Added the pm_runtime calls needed to be able to boot a kernel with pm_runtime and this driver, patch from Courtney. - Added sfpb-mutex compatible, for re-use of the driver in family A platforms. - Updated formatting of DT binding documentation, while adding the extra compatible. - Dropped Stephen Boyds Reviewed-by due to these changes. [1] https://lkml.org/lkml/2014/9/12/636 .../devicetree/bindings/hwlock/qcom-hwspinlock.txt | 50 +++++++ drivers/hwspinlock/Kconfig | 11 ++ drivers/hwspinlock/Makefile | 1 + drivers/hwspinlock/qcom_hwspinlock.c | 156 ++++++++++++++++++++ 4 files changed, 218 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt create mode 100644 drivers/hwspinlock/qcom_hwspinlock.c diff --git a/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt new file mode 100644 index 0000000..cd2b912 --- /dev/null +++ b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt @@ -0,0 +1,50 @@ +Qualcomm 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. + +- compatible: + Usage: required + Value type: <string> + Definition: must be one of: + "qcom,sfpb-mutex", + "qcom,tcsr-mutex" + +- reg: + Usage: required + Value type: <prop-encoded-array> + Definition: base address and size of the mutex registers + +- reg-names: + Usage: required + Value type: <string> + Definition: must be "mutex-base" + +- hwlock-base-id: + Usage: optional + Value type: <u32> + Definition: base id of the hwlock device + (hwlock standard property, see hwlock.txt) + +- #hwlock-cells: + Usage: required + Value type: <u32> + Definition: must be 1, the specified cell represent the lock id + (hwlock standard property, see hwlock.txt) + +- hwlock-num-locks: + Usage: required + Value type: <u32> + Definition: the number of locks/mutex available in this block + (hwlock standard property, see hwlock.txt) + +Example: + + hwlock@fd484000 { + compatible = "qcom,tcsr-mutex"; + reg = <0xfd484000 0x1000>; + reg-names = "mutex-base"; + + hwlock-num-locks = <8>; + #hwlock-cells = <1>; + }; diff --git a/drivers/hwspinlock/Kconfig b/drivers/hwspinlock/Kconfig index 3612cb5..762216d 100644 --- a/drivers/hwspinlock/Kconfig +++ b/drivers/hwspinlock/Kconfig @@ -18,6 +18,17 @@ config HWSPINLOCK_OMAP If unsure, say N. +config HWSPINLOCK_QCOM + tristate "Qualcomm Hardware Spinlock device" + depends on ARCH_QCOM + select HWSPINLOCK + help + Say y here to support the Qualcomm Hardware Mutex functionality, which + provides a synchronisation mechanism for the various processors on + the SoC. + + If unsure, say N. + config HSEM_U8500 tristate "STE Hardware Semaphore functionality" depends on ARCH_U8500 diff --git a/drivers/hwspinlock/Makefile b/drivers/hwspinlock/Makefile index 93eb64b..68f95d9 100644 --- a/drivers/hwspinlock/Makefile +++ b/drivers/hwspinlock/Makefile @@ -4,4 +4,5 @@ obj-$(CONFIG_HWSPINLOCK) += hwspinlock_core.o obj-$(CONFIG_HWSPINLOCK_OMAP) += omap_hwspinlock.o +obj-$(CONFIG_HWSPINLOCK_QCOM) += qcom_hwspinlock.o obj-$(CONFIG_HSEM_U8500) += u8500_hsem.o diff --git a/drivers/hwspinlock/qcom_hwspinlock.c b/drivers/hwspinlock/qcom_hwspinlock.c new file mode 100644 index 0000000..93a8a5d --- /dev/null +++ b/drivers/hwspinlock/qcom_hwspinlock.c @@ -0,0 +1,156 @@ +/* + * Copyright (c) 2013, The Linux Foundation. All rights reserved. + * Copyright (c) 2014, Sony Mobile Communications AB + * + * 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/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 "hwspinlock_internal.h" + +#define SPINLOCK_ID_APPS_PROC 1 + +static int qcom_hwspinlock_trylock(struct hwspinlock *lock) +{ + void __iomem *lock_addr = lock->priv; + + writel_relaxed(SPINLOCK_ID_APPS_PROC, lock_addr); + + return readl_relaxed(lock_addr) == SPINLOCK_ID_APPS_PROC; +} + +static void qcom_hwspinlock_unlock(struct hwspinlock *lock) +{ + void __iomem *lock_addr = lock->priv; + u32 lock_owner; + + lock_owner = readl_relaxed(lock_addr); + if (lock_owner != SPINLOCK_ID_APPS_PROC) { + pr_err("%s: spinlock not owned by us (actual owner is %d)\n", + __func__, lock_owner); + } + + writel_relaxed(0, lock_addr); +} + +static const struct hwspinlock_ops qcom_hwspinlock_ops = { + .trylock = qcom_hwspinlock_trylock, + .unlock = qcom_hwspinlock_unlock, +}; + +static const struct of_device_id qcom_hwspinlock_of_match[] = { + { .compatible = "qcom,sfpb-mutex", .data = (void *)0x4 }, + { .compatible = "qcom,tcsr-mutex" , .data = (void *)0x80 }, + { } +}; +MODULE_DEVICE_TABLE(of, qcom_hwspinlock_of_match); + +static int qcom_hwspinlock_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + const struct of_device_id *match; + struct hwspinlock_device *bank; + struct hwspinlock *hwlock; + struct resource *res; + void __iomem *iobase; + unsigned stride, i; + size_t array_size; + int num_locks; + int base_id; + int ret; + + match = of_match_device(qcom_hwspinlock_of_match, &pdev->dev); + + ret = of_hwspin_lock_get_base_id(node); + if (ret < 0 && ret != -EINVAL) + return ret; + base_id = ret > 0 ? ret : 0; + + num_locks = of_hwspin_lock_get_num_locks(node); + if (num_locks < 0) + return num_locks; + + 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); + + array_size = num_locks * sizeof(*hwlock); + bank = devm_kzalloc(&pdev->dev, sizeof(*bank) + array_size, GFP_KERNEL); + if (!bank) + return -ENOMEM; + + platform_set_drvdata(pdev, bank); + + stride = (unsigned)match->data; + for (i = 0, hwlock = &bank->lock[0]; i < num_locks; i++, hwlock++) + hwlock->priv = iobase + i * stride; + + pm_runtime_enable(&pdev->dev); + + ret = hwspin_lock_register(bank, &pdev->dev, &qcom_hwspinlock_ops, + base_id, num_locks); + if (ret) + pm_runtime_disable(&pdev->dev); + + return ret; +} + +static int qcom_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; + } + + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static struct platform_driver qcom_hwspinlock_driver = { + .probe = qcom_hwspinlock_probe, + .remove = qcom_hwspinlock_remove, + .driver = { + .name = "qcom_hwspinlock", + .of_match_table = qcom_hwspinlock_of_match, + }, +}; + +static int __init qcom_hwspinlock_init(void) +{ + return platform_driver_register(&qcom_hwspinlock_driver); +} +/* board init code might need to reserve hwspinlocks for predefined purposes */ +postcore_initcall(qcom_hwspinlock_init); + +static void __exit qcom_hwspinlock_exit(void) +{ + platform_driver_unregister(&qcom_hwspinlock_driver); +} +module_exit(qcom_hwspinlock_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Hardware spinlock driver for Qualcomm SoCs"); +MODULE_AUTHOR("Kumar Gala <galak@xxxxxxxxxxxxxx>"); +MODULE_AUTHOR("Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx>"); +MODULE_AUTHOR("Eric Holmberg <eholmber@xxxxxxxxxxxxxx>"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
