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Message-ID: <555FB2F2.7080109@ti.com>
Date: Fri, 22 May 2015 17:51:30 -0500
From: Suman Anna <s-anna@...com>
To: Barry Song <21cnbao@...il.com>, <ohad@...ery.com>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: <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
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.
> +
> + 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.
regards
Suman
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