On 9/29/2014 10:35 PM, Bjorn Andersson wrote:
From: Kumar Gala <galak@xxxxxxxxxxxxxx>
Add driver for Qualcomm Hardware Mutex block that exists on newer
Qualcomm SoCs.
Cc: Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx>
Cc: Eric Holmberg <eholmber@xxxxxxxxxxxxxx>
Cc: Courtney Cavin <courtney.cavin@xxxxxxxxxxxxxx>
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 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@xxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx>");
+MODULE_AUTHOR("Eric Holmberg <eholmber@xxxxxxxxxxxxxx>");
Jeffrey Hugo
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