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Date: Tue, 30 Sep 2014 16:14:34 -0600
From: Jeffrey Hugo <jhugo@...eaurora.org>
To: Bjorn Andersson <bjorn.andersson@...ymobile.com>,
Ohad Ben-Cohen <ohad@...ery.com>,
Kumar Gala <galak@...eaurora.org>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Grant Likely <grant.likely@...aro.org>
CC: Suman Anna <s-anna@...com>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
Eric Holmberg <eholmber@...eaurora.org>,
Courtney Cavin <courtney.cavin@...ymobile.com>
Subject: Re: [PATCH v4] hwspinlock: qcom: Add support for Qualcomm HW Mutex
block
On 9/29/2014 10:35 PM, Bjorn Andersson wrote:
> From: Kumar Gala <galak@...eaurora.org>
>
> Add driver for Qualcomm Hardware Mutex block that exists on newer
> Qualcomm SoCs.
>
> Cc: Jeffrey Hugo <jhugo@...eaurora.org>
> Cc: Eric Holmberg <eholmber@...eaurora.org>
> Cc: Courtney Cavin <courtney.cavin@...ymobile.com>
> Signed-off-by: Kumar Gala <galak@...eaurora.org>
> [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@...ymobile.com>
> ---
>
> 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 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.
> .../devicetree/bindings/hwlock/qcom-hwspinlock.txt | 35 +++++
> drivers/hwspinlock/Kconfig | 11 ++
> drivers/hwspinlock/Makefile | 1 +
> drivers/hwspinlock/qcom_hwspinlock.c | 151 ++++++++++++++++++++
> 4 files changed, 198 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
> create mode 100644 drivers/hwspinlock/qcom_hwspinlock.c
>
<snip>
> +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;
> + u32 num_locks;
> + int ret;
> +
> + match = of_match_device(qcom_hwspinlock_of_match, &pdev->dev);
Didn't this have error handling in v2?
> +
> + 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);
> +
> + 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@...eaurora.org>");
> +MODULE_AUTHOR("Jeffrey Hugo <jhugo@...eaurora.org>");
> +MODULE_AUTHOR("Eric Holmberg <eholmber@...eaurora.org>");
>
Jeffrey Hugo
--
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation.
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