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Date: Tue, 26 May 2015 12:03:39 -0500
From: Suman Anna <s-anna@...com>
To: Barry Song <21cnbao@...il.com>
CC: Ohad Ben-Cohen <ohad@...ery.com>,
LKML <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
DL-SHA-WorkGroupLinux <workgroup.linux@....com>,
Wei Chen <wei.chen@....com>, Bjorn Andersson <bjorn@...o.se>,
Barry Song <Baohua.Song@....com>
Subject: Re: [PATCH 1/3 v3] drivers: hwspinlock: add CSR atlas7 implementation
On 05/25/2015 12:37 AM, Barry Song wrote:
> 2015-05-23 6:51 GMT+08:00 Suman Anna <s-anna@...com>:
>> Hi Barry,
>>
>> On 05/19/2015 01:41 AM, Barry Song wrote:
>>> From: Wei Chen <wei.chen@....com>
>>>
>>> Add hwspinlock support for the CSR atlas7 SoC.
>>>
>>> The Hardware Spinlock device on atlas7 provides hardware assistance
>>> for synchronization between the multiple processors in the system
>>> (dual Cortex-A7, CAN bus Cortex-M3 and audio DSP).
>>>
>>> Cc: Suman Anna <s-anna@...com>
>>> Cc: Bjorn Andersson <bjorn@...o.se>
>>> Signed-off-by: Wei Chen <wei.chen@....com>
>>> Signed-off-by: Barry Song <Baohua.Song@....com>
>>> ---
>>> -v3:
>>> use #hwlock-cells and general hwspinlock dt-binding;
>>> drop relax();
>>> drop num-spinlocks in dts;
>>> re-order Kconfig and Makefile;
>>> other codingstyle issues.
>>> Thanks Suman, Bjorn and Ohad
>>>
>>> drivers/hwspinlock/Kconfig | 12 ++++
>>> drivers/hwspinlock/Makefile | 1 +
>>> drivers/hwspinlock/sirf_hwspinlock.c | 135 +++++++++++++++++++++++++++++++++++
>>> 3 files changed, 148 insertions(+)
>>> create mode 100644 drivers/hwspinlock/sirf_hwspinlock.c
>>>
>>> diff --git a/drivers/hwspinlock/Kconfig b/drivers/hwspinlock/Kconfig
>>> index b5b4f52..73a4016 100644
>>> --- a/drivers/hwspinlock/Kconfig
>>> +++ b/drivers/hwspinlock/Kconfig
>>> @@ -30,6 +30,18 @@ config HWSPINLOCK_QCOM
>>>
>>> If unsure, say N.
>>>
>>> +config HWSPINLOCK_SIRF
>>> + tristate "SIRF Hardware Spinlock device"
>>> + 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
>>> + on the SoC.
>>> +
>>> + It's safe to say n here if you're not interested in SIRF hardware
>>> + spinlock or just want a bare minimum kernel.
>>> +
>>> config HSEM_U8500
>>> tristate "STE Hardware Semaphore functionality"
>>> depends on ARCH_U8500
>>> diff --git a/drivers/hwspinlock/Makefile b/drivers/hwspinlock/Makefile
>>> index 68f95d9..6b59cb5a 100644
>>> --- a/drivers/hwspinlock/Makefile
>>> +++ b/drivers/hwspinlock/Makefile
>>> @@ -5,4 +5,5 @@
>>> 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_HSEM_U8500) += u8500_hsem.o
>>> diff --git a/drivers/hwspinlock/sirf_hwspinlock.c b/drivers/hwspinlock/sirf_hwspinlock.c
>>> new file mode 100644
>>> index 0000000..e7e5ba6
>>> --- /dev/null
>>> +++ b/drivers/hwspinlock/sirf_hwspinlock.c
>>> @@ -0,0 +1,135 @@
>>> +/*
>>> + * SIRF hardware spinlock driver
>>> + *
>>> + * Copyright (c) 2014 Cambridge Silicon Radio Limited, a CSR plc group company.
>>
>> Not sure on this, but 2015 is here and now..
>>
>>> + *
>>> + * Licensed under GPLv2.
>>> + */
>>> +
>>> +#include <linux/kernel.h>
>>> +#include <linux/module.h>
>>> +#include <linux/device.h>
>>> +#include <linux/io.h>
>>> +#include <linux/pm_runtime.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/spinlock.h>
>>> +#include <linux/hwspinlock.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/of.h>
>>> +#include <linux/of_address.h>
>>> +
>>> +#include "hwspinlock_internal.h"
>>> +
>>> +struct sirf_hwspinlock {
>>> + void __iomem *io_base;
>>> + struct hwspinlock_device bank;
>>> +};
>>> +
>>> +/* Number of Hardware Spinlocks*/
>>> +#define HW_SPINLOCK_NUMBER 30
>>> +
>>> +/* Hardware spinlock register offsets */
>>> +#define HW_SPINLOCK_BASE 0x404
>>> +#define HW_SPINLOCK_OFFSET(x) (HW_SPINLOCK_BASE + 0x4 * (x))
>>> +
>>> +static int sirf_hwspinlock_trylock(struct hwspinlock *lock)
>>> +{
>>> + void __iomem *lock_addr = lock->priv;
>>> +
>>> + /* attempt to acquire the lock by reading value == 1 from it */
>>> + return !!readl(lock_addr);
>>> +}
>>> +
>>> +static void sirf_hwspinlock_unlock(struct hwspinlock *lock)
>>> +{
>>> + void __iomem *lock_addr = lock->priv;
>>> +
>>> + /* release the lock by writing 0 to it */
>>> + writel(0, lock_addr);
>>> +}
>>> +
>>> +static const struct hwspinlock_ops sirf_hwspinlock_ops = {
>>> + .trylock = sirf_hwspinlock_trylock,
>>> + .unlock = sirf_hwspinlock_unlock,
>>> +};
>>> +
>>> +static int sirf_hwspinlock_probe(struct platform_device *pdev)
>>> +{
>>> + struct sirf_hwspinlock *hwspin;
>>> + struct hwspinlock *hwlock;
>>> + int idx, ret;
>>> +
>>> + if (!pdev->dev.of_node)
>>> + return -ENODEV;
>>> +
>>> + hwspin = devm_kzalloc(&pdev->dev, sizeof(*hwspin) +
>>> + sizeof(*hwlock) * HW_SPINLOCK_NUMBER, GFP_KERNEL);
>>> + if (!hwspin)
>>> + return -ENOMEM;
>>> +
>>> + /* retrieve io base */
>>> + hwspin->io_base = of_iomap(pdev->dev.of_node, 0);
>>> + if (!hwspin->io_base)
>>> + ret = -ENOMEM;
>>
>> You are missing the bail out here.
>
> real. it should be "return -ENOMEM"
>
>>
>>> +
>>> + for (idx = 0; idx < HW_SPINLOCK_NUMBER; idx++) {
>>> + hwlock = &hwspin->bank.lock[idx];
>>> + hwlock->priv = hwspin->io_base + HW_SPINLOCK_OFFSET(idx);
>>> + }
>>> +
>>> + platform_set_drvdata(pdev, hwspin);
>>> +
>>> + pm_runtime_enable(&pdev->dev);
>>> +
>>> + ret = hwspin_lock_register(&hwspin->bank, &pdev->dev,
>>> + &sirf_hwspinlock_ops, 0, HW_SPINLOCK_NUMBER);
>>
>> this is a checkpatch warning with the --strict option, not sure what
>> convention Ohad is following though. Rest looks good.
>
> do you mean this CHECK?
>
> CHECK: Alignment should match open parenthesis
> #87: FILE: drivers/hwspinlock/sirf_hwspinlock.c:87:
> + ret = hwspin_lock_register(&hwspin->bank, &pdev->dev,
> + &sirf_hwspinlock_ops, 0, HW_SPINLOCK_NUMBER);
Yes.
regards
Suman
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