hwspinlock updates for v4.13
This introduces a driver for the Spreadtrum hardware spinlock device and cleans up the Kconfig file. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJZXXheAAoJEAsfOT8Nma3Fy1cP/238E4FI3VNUY+AKYBZyHOV+ 38FZRqAG9BGtv5crH6TNCFiQNpP7aFidu9tKmYqHykHCMfJFEyKXprHd2mPAOq2h fat82w6SS9caXdtDhzw+OEzn17xFqAiybydXJ+RrqEVSkXfm69r9/apjvgIXdZeZ SVPab1ofInLEAPkci6lD+XrIzbc1+N/+sO5ZBEGPWVShdbBupIIkJpV0UsNQJOuO mzDn4bjl+EhXxMK3v7JfZ/kRtenBBzj/qYn2Mm/6g8Ytoui0GDQUlyrkTz8A3XQ8 JSxluzWnNAtc4AFXkctsoGe6CsOOiSKHoQEIa2/FV/XwRaU8MZpY7ofLuLwOHmDP H/qAIsl9cXBGNBuXZ5HEB4BzqtsgfwpBcFaWX0zFdVFDlwznd11R6IxJIPdZ13xp z30toStxKvUy1iH9K4iiekvvbdNN1atytbnQakpW6vJisevFdST6ceDFbjWaAFoL O+mnFWeV3aRMRtDxJWI1IiDUJ6GS0O9rTHqKoRqHH69lrm8RTMMG6eMLFmD9U5qM QfjwITQecrqVntAK+667I6U3oTCGLiIttm7kSDDFAcH2yn9n4TmP5WYLZvO9EoLH Mf5uEev060mUJAXfibbWC6Gp9dmRH0M7zw2jTx1FbmST+8s8kGS12d3pY9eBkJk2 oIXLPY5Gf9D2vs0Ov9bT =YiJ+ -----END PGP SIGNATURE----- Merge tag 'hwlock-v4.13' of git://github.com/andersson/remoteproc Pull hwspinlock updates from Bjorn Andersson: "This introduces a driver for the Spreadtrum hardware spinlock device and cleans up the Kconfig file" * tag 'hwlock-v4.13' of git://github.com/andersson/remoteproc: DT: hwspinlock: Add binding documentation for Spreadtrum hwspinlock hwspinlock: sprd: Add hardware spinlock driver Make HWSPINLOCK a menuconfig to ease disablinghifive-unleashed-5.1
Linus Torvalds
commit
e0f25a3f2d
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@ -0,0 +1,23 @@
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SPRD Hardware Spinlock Device Binding
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-------------------------------------
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Required properties :
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- compatible : should be "sprd,hwspinlock-r3p0".
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- reg : the register address of hwspinlock.
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- #hwlock-cells : hwlock users only use the hwlock id to represent a specific
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hwlock, so the number of cells should be <1> here.
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- clock-names : Must contain "enable".
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- clocks : Must contain a phandle entry for the clock in clock-names, see the
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common clock bindings.
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Please look at the generic hwlock binding for usage information for consumers,
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"Documentation/devicetree/bindings/hwlock/hwlock.txt"
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Example of hwlock provider:
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hwspinlock@40500000 {
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compatible = "sprd,hwspinlock-r3p0";
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reg = <0 0x40500000 0 0x1000>;
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#hwlock-cells = <1>;
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clock-names = "enable";
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clocks = <&clk_aon_apb_gates0 22>;
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};
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@ -2,16 +2,13 @@
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# Generic HWSPINLOCK framework
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#
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# HWSPINLOCK always gets selected by whoever wants it.
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config HWSPINLOCK
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tristate
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menu "Hardware Spinlock drivers"
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menuconfig HWSPINLOCK
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tristate "Hardware Spinlock drivers"
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config HWSPINLOCK_OMAP
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tristate "OMAP Hardware Spinlock device"
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depends on HWSPINLOCK
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depends on ARCH_OMAP4 || SOC_OMAP5 || SOC_DRA7XX || SOC_AM33XX || SOC_AM43XX
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select HWSPINLOCK
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help
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Say y here to support the OMAP Hardware Spinlock device (firstly
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introduced in OMAP4).
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@ -20,8 +17,8 @@ config HWSPINLOCK_OMAP
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config HWSPINLOCK_QCOM
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tristate "Qualcomm Hardware Spinlock device"
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depends on HWSPINLOCK
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depends on ARCH_QCOM
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select HWSPINLOCK
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select MFD_SYSCON
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help
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Say y here to support the Qualcomm Hardware Mutex functionality, which
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@ -32,8 +29,8 @@ config HWSPINLOCK_QCOM
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config HWSPINLOCK_SIRF
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tristate "SIRF Hardware Spinlock device"
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depends on HWSPINLOCK
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depends on ARCH_SIRF
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select HWSPINLOCK
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help
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Say y here to support the SIRF Hardware Spinlock device, which
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provides a synchronisation mechanism for the various processors
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@ -42,15 +39,22 @@ config HWSPINLOCK_SIRF
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It's safe to say n here if you're not interested in SIRF hardware
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spinlock or just want a bare minimum kernel.
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config HWSPINLOCK_SPRD
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tristate "SPRD Hardware Spinlock device"
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depends on ARCH_SPRD
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depends on HWSPINLOCK
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help
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Say y here to support the SPRD Hardware Spinlock device.
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If unsure, say N.
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config HSEM_U8500
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tristate "STE Hardware Semaphore functionality"
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depends on HWSPINLOCK
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depends on ARCH_U8500
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select HWSPINLOCK
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help
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Say y here to support the STE Hardware Semaphore functionality, which
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provides a synchronisation mechanism for the various processor on the
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SoC.
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If unsure, say N.
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endmenu
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@ -6,4 +6,5 @@ obj-$(CONFIG_HWSPINLOCK) += hwspinlock_core.o
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obj-$(CONFIG_HWSPINLOCK_OMAP) += omap_hwspinlock.o
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obj-$(CONFIG_HWSPINLOCK_QCOM) += qcom_hwspinlock.o
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obj-$(CONFIG_HWSPINLOCK_SIRF) += sirf_hwspinlock.o
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obj-$(CONFIG_HWSPINLOCK_SPRD) += sprd_hwspinlock.o
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obj-$(CONFIG_HSEM_U8500) += u8500_hsem.o
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@ -0,0 +1,183 @@
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/*
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* Spreadtrum hardware spinlock driver
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* Copyright (C) 2017 Spreadtrum - http://www.spreadtrum.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/hwspinlock.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include "hwspinlock_internal.h"
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/* hwspinlock registers definition */
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#define HWSPINLOCK_RECCTRL 0x4
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#define HWSPINLOCK_MASTERID(_X_) (0x80 + 0x4 * (_X_))
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#define HWSPINLOCK_TOKEN(_X_) (0x800 + 0x4 * (_X_))
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/* unlocked value */
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#define HWSPINLOCK_NOTTAKEN 0x55aa10c5
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/* bits definition of RECCTRL reg */
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#define HWSPINLOCK_USER_BITS 0x1
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/* hwspinlock number */
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#define SPRD_HWLOCKS_NUM 32
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struct sprd_hwspinlock_dev {
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void __iomem *base;
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struct clk *clk;
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struct hwspinlock_device bank;
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};
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/* try to lock the hardware spinlock */
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static int sprd_hwspinlock_trylock(struct hwspinlock *lock)
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{
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struct sprd_hwspinlock_dev *sprd_hwlock =
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dev_get_drvdata(lock->bank->dev);
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void __iomem *addr = lock->priv;
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int user_id, lock_id;
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if (!readl(addr))
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return 1;
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lock_id = hwlock_to_id(lock);
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/* get the hardware spinlock master/user id */
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user_id = readl(sprd_hwlock->base + HWSPINLOCK_MASTERID(lock_id));
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dev_warn(sprd_hwlock->bank.dev,
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"hwspinlock [%d] lock failed and master/user id = %d!\n",
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lock_id, user_id);
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return 0;
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}
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/* unlock the hardware spinlock */
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static void sprd_hwspinlock_unlock(struct hwspinlock *lock)
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{
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void __iomem *lock_addr = lock->priv;
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writel(HWSPINLOCK_NOTTAKEN, lock_addr);
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}
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/* The specs recommended below number as the retry delay time */
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static void sprd_hwspinlock_relax(struct hwspinlock *lock)
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{
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ndelay(10);
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}
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static const struct hwspinlock_ops sprd_hwspinlock_ops = {
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.trylock = sprd_hwspinlock_trylock,
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.unlock = sprd_hwspinlock_unlock,
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.relax = sprd_hwspinlock_relax,
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};
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static int sprd_hwspinlock_probe(struct platform_device *pdev)
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{
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struct sprd_hwspinlock_dev *sprd_hwlock;
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struct hwspinlock *lock;
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struct resource *res;
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int i, ret;
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if (!pdev->dev.of_node)
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return -ENODEV;
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sprd_hwlock = devm_kzalloc(&pdev->dev,
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sizeof(struct sprd_hwspinlock_dev) +
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SPRD_HWLOCKS_NUM * sizeof(*lock),
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GFP_KERNEL);
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if (!sprd_hwlock)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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sprd_hwlock->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(sprd_hwlock->base))
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return PTR_ERR(sprd_hwlock->base);
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sprd_hwlock->clk = devm_clk_get(&pdev->dev, "enable");
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if (IS_ERR(sprd_hwlock->clk)) {
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dev_err(&pdev->dev, "get hwspinlock clock failed!\n");
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return PTR_ERR(sprd_hwlock->clk);
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}
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clk_prepare_enable(sprd_hwlock->clk);
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/* set the hwspinlock to record user id to identify subsystems */
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writel(HWSPINLOCK_USER_BITS, sprd_hwlock->base + HWSPINLOCK_RECCTRL);
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for (i = 0; i < SPRD_HWLOCKS_NUM; i++) {
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lock = &sprd_hwlock->bank.lock[i];
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lock->priv = sprd_hwlock->base + HWSPINLOCK_TOKEN(i);
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}
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platform_set_drvdata(pdev, sprd_hwlock);
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pm_runtime_enable(&pdev->dev);
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ret = hwspin_lock_register(&sprd_hwlock->bank, &pdev->dev,
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&sprd_hwspinlock_ops, 0, SPRD_HWLOCKS_NUM);
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if (ret) {
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pm_runtime_disable(&pdev->dev);
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clk_disable_unprepare(sprd_hwlock->clk);
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return ret;
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}
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return 0;
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}
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static int sprd_hwspinlock_remove(struct platform_device *pdev)
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{
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struct sprd_hwspinlock_dev *sprd_hwlock = platform_get_drvdata(pdev);
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hwspin_lock_unregister(&sprd_hwlock->bank);
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pm_runtime_disable(&pdev->dev);
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clk_disable_unprepare(sprd_hwlock->clk);
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return 0;
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}
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static const struct of_device_id sprd_hwspinlock_of_match[] = {
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{ .compatible = "sprd,hwspinlock-r3p0", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, sprd_hwspinlock_of_match);
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static struct platform_driver sprd_hwspinlock_driver = {
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.probe = sprd_hwspinlock_probe,
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.remove = sprd_hwspinlock_remove,
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.driver = {
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.name = "sprd_hwspinlock",
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.of_match_table = of_match_ptr(sprd_hwspinlock_of_match),
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},
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};
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static int __init sprd_hwspinlock_init(void)
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{
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return platform_driver_register(&sprd_hwspinlock_driver);
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}
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postcore_initcall(sprd_hwspinlock_init);
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static void __exit sprd_hwspinlock_exit(void)
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{
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platform_driver_unregister(&sprd_hwspinlock_driver);
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}
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module_exit(sprd_hwspinlock_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Hardware spinlock driver for Spreadtrum");
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MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
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MODULE_AUTHOR("Lanqing Liu <lanqing.liu@spreadtrum.com>");
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MODULE_AUTHOR("Long Cheng <aiden.cheng@spreadtrum.com>");
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