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Message-ID: <4DACFCB8.8040103@metafoo.de>
Date: Tue, 19 Apr 2011 05:08:40 +0200
From: Lars-Peter Clausen <lars@...afoo.de>
To: "Rafael J. Wysocki" <rjw@...k.pl>
CC: LKML <linux-kernel@...r.kernel.org>, Greg KH <gregkh@...e.de>,
Kay Sievers <kay.sievers@...e.de>,
Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
Russell King <linux@....linux.org.uk>,
linux-omap@...r.kernel.org, Kevin Hilman <khilman@...com>,
linux-arm-kernel@...ts.infradead.org,
Ben Dooks <ben-linux@...ff.org>,
Mike Frysinger <vapier@...too.org>,
Ralf Baechle <ralf@...ux-mips.org>,
Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>,
Guan Xuetao <gxt@...c.pku.edu.cn>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
linuxppc-dev@...ts.ozlabs.org, Jiri Kosina <jkosina@...e.cz>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 10/14] PM / MIPS: Use struct syscore_ops instead of sysdevs
for PM
On 04/17/2011 11:12 PM, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
>
> Convert some MIPS architecture's code to using struct syscore_ops
> objects for power management instead of sysdev classes and sysdevs.
>
> This simplifies the code and reduces the kernel's memory footprint.
> It also is necessary for removing sysdevs from the kernel entirely in
> the future.
>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
For the jz4740 part:
Acked-and-tested-by: Lars-Peter Clausen <lars@...afoo.de>
> ---
> arch/mips/alchemy/common/dbdma.c | 92 +++++++++++----------------------------
> arch/mips/alchemy/common/irq.c | 62 +++++++++-----------------
> arch/mips/jz4740/gpio.c | 52 +++++++++-------------
> arch/mips/kernel/i8259.c | 26 +++--------
> 4 files changed, 80 insertions(+), 152 deletions(-)
>
> Index: linux-2.6/arch/mips/alchemy/common/irq.c
> ===================================================================
> --- linux-2.6.orig/arch/mips/alchemy/common/irq.c
> +++ linux-2.6/arch/mips/alchemy/common/irq.c
> @@ -30,7 +30,7 @@
> #include <linux/interrupt.h>
> #include <linux/irq.h>
> #include <linux/slab.h>
> -#include <linux/sysdev.h>
> +#include <linux/syscore_ops.h>
>
> #include <asm/irq_cpu.h>
> #include <asm/mipsregs.h>
> @@ -556,17 +556,15 @@ void __init arch_init_irq(void)
> }
> }
>
> -struct alchemy_ic_sysdev {
> - struct sys_device sysdev;
> +struct alchemy_ic {
> void __iomem *base;
> unsigned long pmdata[7];
> };
>
> -static int alchemy_ic_suspend(struct sys_device *dev, pm_message_t state)
> -{
> - struct alchemy_ic_sysdev *icdev =
> - container_of(dev, struct alchemy_ic_sysdev, sysdev);
> +static struct alchemy_ic alchemy_ic_data[2];
>
> +static void alchemy_suspend_one_ic(struct alchemy_ic *icdev)
> +{
> icdev->pmdata[0] = __raw_readl(icdev->base + IC_CFG0RD);
> icdev->pmdata[1] = __raw_readl(icdev->base + IC_CFG1RD);
> icdev->pmdata[2] = __raw_readl(icdev->base + IC_CFG2RD);
> @@ -574,15 +572,17 @@ static int alchemy_ic_suspend(struct sys
> icdev->pmdata[4] = __raw_readl(icdev->base + IC_ASSIGNRD);
> icdev->pmdata[5] = __raw_readl(icdev->base + IC_WAKERD);
> icdev->pmdata[6] = __raw_readl(icdev->base + IC_MASKRD);
> +}
>
> +static int alchemy_ic_suspend(void)
> +{
> + alchemy_suspend_one_ic(alchemy_ic_data);
> + alchemy_suspend_one_ic(alchemy_ic_data + 1);
> return 0;
> }
>
> -static int alchemy_ic_resume(struct sys_device *dev)
> +static void alchemy_resume_one_ic(struct alchemy_ic *icdev)
> {
> - struct alchemy_ic_sysdev *icdev =
> - container_of(dev, struct alchemy_ic_sysdev, sysdev);
> -
> __raw_writel(0xffffffff, icdev->base + IC_MASKCLR);
> __raw_writel(0xffffffff, icdev->base + IC_CFG0CLR);
> __raw_writel(0xffffffff, icdev->base + IC_CFG1CLR);
> @@ -604,42 +604,26 @@ static int alchemy_ic_resume(struct sys_
>
> __raw_writel(icdev->pmdata[6], icdev->base + IC_MASKSET);
> wmb();
> +}
>
> - return 0;
> +static void alchemy_ic_resume(void)
> +{
> + alchemy_resume_one_ic(alchemy_ic_data + 1);
> + alchemy_resume_one_ic(alchemy_ic_data);
> }
>
> -static struct sysdev_class alchemy_ic_sysdev_class = {
> - .name = "ic",
> +static struct syscore_ops alchemy_ic_syscore_ops = {
> .suspend = alchemy_ic_suspend,
> .resume = alchemy_ic_resume,
> };
>
> -static int __init alchemy_ic_sysdev_init(void)
> +static int __init alchemy_ic_syscore_init(void)
> {
> - struct alchemy_ic_sysdev *icdev;
> - unsigned long icbase[2] = { IC0_PHYS_ADDR, IC1_PHYS_ADDR };
> - int err, i;
> -
> - err = sysdev_class_register(&alchemy_ic_sysdev_class);
> - if (err)
> - return err;
> -
> - for (i = 0; i < 2; i++) {
> - icdev = kzalloc(sizeof(struct alchemy_ic_sysdev), GFP_KERNEL);
> - if (!icdev)
> - return -ENOMEM;
> -
> - icdev->base = ioremap(icbase[i], 0x1000);
> -
> - icdev->sysdev.id = i;
> - icdev->sysdev.cls = &alchemy_ic_sysdev_class;
> - err = sysdev_register(&icdev->sysdev);
> - if (err) {
> - kfree(icdev);
> - return err;
> - }
> - }
> + alchemy_ic_data[0].base = ioremap(icbase[IC0_PHYS_ADDR], 0x1000);
> + alchemy_ic_data[1].base = ioremap(icbase[IC1_PHYS_ADDR], 0x1000);
> +
> + register_syscore_ops(&alchemy_ic_syscore_ops);
>
> return 0;
> }
> -device_initcall(alchemy_ic_sysdev_init);
> +device_initcall(alchemy_ic_syscore_init);
> Index: linux-2.6/arch/mips/alchemy/common/dbdma.c
> ===================================================================
> --- linux-2.6.orig/arch/mips/alchemy/common/dbdma.c
> +++ linux-2.6/arch/mips/alchemy/common/dbdma.c
> @@ -36,7 +36,7 @@
> #include <linux/spinlock.h>
> #include <linux/interrupt.h>
> #include <linux/module.h>
> -#include <linux/sysdev.h>
> +#include <linux/syscore_ops.h>
> #include <asm/mach-au1x00/au1000.h>
> #include <asm/mach-au1x00/au1xxx_dbdma.h>
>
> @@ -957,37 +957,30 @@ u32 au1xxx_dbdma_put_dscr(u32 chanid, au
> return nbytes;
> }
>
> +static u32 alchemy_dbdma_pm_regs[NUM_DBDMA_CHANS + 1][6];
>
> -struct alchemy_dbdma_sysdev {
> - struct sys_device sysdev;
> - u32 pm_regs[NUM_DBDMA_CHANS + 1][6];
> -};
> -
> -static int alchemy_dbdma_suspend(struct sys_device *dev,
> - pm_message_t state)
> +static int alchemy_dbdma_suspend(void)
> {
> - struct alchemy_dbdma_sysdev *sdev =
> - container_of(dev, struct alchemy_dbdma_sysdev, sysdev);
> int i;
> u32 addr;
>
> addr = DDMA_GLOBAL_BASE;
> - sdev->pm_regs[0][0] = au_readl(addr + 0x00);
> - sdev->pm_regs[0][1] = au_readl(addr + 0x04);
> - sdev->pm_regs[0][2] = au_readl(addr + 0x08);
> - sdev->pm_regs[0][3] = au_readl(addr + 0x0c);
> + alchemy_dbdma_pm_regs[0][0] = au_readl(addr + 0x00);
> + alchemy_dbdma_pm_regs[0][1] = au_readl(addr + 0x04);
> + alchemy_dbdma_pm_regs[0][2] = au_readl(addr + 0x08);
> + alchemy_dbdma_pm_regs[0][3] = au_readl(addr + 0x0c);
>
> /* save channel configurations */
> for (i = 1, addr = DDMA_CHANNEL_BASE; i <= NUM_DBDMA_CHANS; i++) {
> - sdev->pm_regs[i][0] = au_readl(addr + 0x00);
> - sdev->pm_regs[i][1] = au_readl(addr + 0x04);
> - sdev->pm_regs[i][2] = au_readl(addr + 0x08);
> - sdev->pm_regs[i][3] = au_readl(addr + 0x0c);
> - sdev->pm_regs[i][4] = au_readl(addr + 0x10);
> - sdev->pm_regs[i][5] = au_readl(addr + 0x14);
> + alchemy_dbdma_pm_regs[i][0] = au_readl(addr + 0x00);
> + alchemy_dbdma_pm_regs[i][1] = au_readl(addr + 0x04);
> + alchemy_dbdma_pm_regs[i][2] = au_readl(addr + 0x08);
> + alchemy_dbdma_pm_regs[i][3] = au_readl(addr + 0x0c);
> + alchemy_dbdma_pm_regs[i][4] = au_readl(addr + 0x10);
> + alchemy_dbdma_pm_regs[i][5] = au_readl(addr + 0x14);
>
> /* halt channel */
> - au_writel(sdev->pm_regs[i][0] & ~1, addr + 0x00);
> + au_writel(alchemy_dbdma_pm_regs[i][0] & ~1, addr + 0x00);
> au_sync();
> while (!(au_readl(addr + 0x14) & 1))
> au_sync();
> @@ -1001,62 +994,35 @@ static int alchemy_dbdma_suspend(struct
> return 0;
> }
>
> -static int alchemy_dbdma_resume(struct sys_device *dev)
> +static void alchemy_dbdma_resume(void)
> {
> - struct alchemy_dbdma_sysdev *sdev =
> - container_of(dev, struct alchemy_dbdma_sysdev, sysdev);
> int i;
> u32 addr;
>
> addr = DDMA_GLOBAL_BASE;
> - au_writel(sdev->pm_regs[0][0], addr + 0x00);
> - au_writel(sdev->pm_regs[0][1], addr + 0x04);
> - au_writel(sdev->pm_regs[0][2], addr + 0x08);
> - au_writel(sdev->pm_regs[0][3], addr + 0x0c);
> + au_writel(alchemy_dbdma_pm_regs[0][0], addr + 0x00);
> + au_writel(alchemy_dbdma_pm_regs[0][1], addr + 0x04);
> + au_writel(alchemy_dbdma_pm_regs[0][2], addr + 0x08);
> + au_writel(alchemy_dbdma_pm_regs[0][3], addr + 0x0c);
>
> /* restore channel configurations */
> for (i = 1, addr = DDMA_CHANNEL_BASE; i <= NUM_DBDMA_CHANS; i++) {
> - au_writel(sdev->pm_regs[i][0], addr + 0x00);
> - au_writel(sdev->pm_regs[i][1], addr + 0x04);
> - au_writel(sdev->pm_regs[i][2], addr + 0x08);
> - au_writel(sdev->pm_regs[i][3], addr + 0x0c);
> - au_writel(sdev->pm_regs[i][4], addr + 0x10);
> - au_writel(sdev->pm_regs[i][5], addr + 0x14);
> + au_writel(alchemy_dbdma_pm_regs[i][0], addr + 0x00);
> + au_writel(alchemy_dbdma_pm_regs[i][1], addr + 0x04);
> + au_writel(alchemy_dbdma_pm_regs[i][2], addr + 0x08);
> + au_writel(alchemy_dbdma_pm_regs[i][3], addr + 0x0c);
> + au_writel(alchemy_dbdma_pm_regs[i][4], addr + 0x10);
> + au_writel(alchemy_dbdma_pm_regs[i][5], addr + 0x14);
> au_sync();
> addr += 0x100; /* next channel base */
> }
> -
> - return 0;
> }
>
> -static struct sysdev_class alchemy_dbdma_sysdev_class = {
> - .name = "dbdma",
> +static struct syscore_ops alchemy_dbdma_syscore_ops = {
> .suspend = alchemy_dbdma_suspend,
> .resume = alchemy_dbdma_resume,
> };
>
> -static int __init alchemy_dbdma_sysdev_init(void)
> -{
> - struct alchemy_dbdma_sysdev *sdev;
> - int ret;
> -
> - ret = sysdev_class_register(&alchemy_dbdma_sysdev_class);
> - if (ret)
> - return ret;
> -
> - sdev = kzalloc(sizeof(struct alchemy_dbdma_sysdev), GFP_KERNEL);
> - if (!sdev)
> - return -ENOMEM;
> -
> - sdev->sysdev.id = -1;
> - sdev->sysdev.cls = &alchemy_dbdma_sysdev_class;
> - ret = sysdev_register(&sdev->sysdev);
> - if (ret)
> - kfree(sdev);
> -
> - return ret;
> -}
> -
> static int __init au1xxx_dbdma_init(void)
> {
> int irq_nr, ret;
> @@ -1084,11 +1050,7 @@ static int __init au1xxx_dbdma_init(void
> else {
> dbdma_initialized = 1;
> printk(KERN_INFO "Alchemy DBDMA initialized\n");
> - ret = alchemy_dbdma_sysdev_init();
> - if (ret) {
> - printk(KERN_ERR "DBDMA PM init failed\n");
> - ret = 0;
> - }
> + register_syscore_ops(&alchemy_dbdma_syscore_ops);
> }
>
> return ret;
> Index: linux-2.6/arch/mips/jz4740/gpio.c
> ===================================================================
> --- linux-2.6.orig/arch/mips/jz4740/gpio.c
> +++ linux-2.6/arch/mips/jz4740/gpio.c
> @@ -18,7 +18,7 @@
> #include <linux/init.h>
>
> #include <linux/spinlock.h>
> -#include <linux/sysdev.h>
> +#include <linux/syscore_ops.h>
> #include <linux/io.h>
> #include <linux/gpio.h>
> #include <linux/delay.h>
> @@ -86,7 +86,6 @@ struct jz_gpio_chip {
> spinlock_t lock;
>
> struct gpio_chip gpio_chip;
> - struct sys_device sysdev;
> };
>
> static struct jz_gpio_chip jz4740_gpio_chips[];
> @@ -459,49 +458,47 @@ static struct jz_gpio_chip jz4740_gpio_c
> JZ4740_GPIO_CHIP(D),
> };
>
> -static inline struct jz_gpio_chip *sysdev_to_chip(struct sys_device *dev)
> +static void jz4740_gpio_suspend_chip(struct jz_gpio_chip *chip)
> {
> - return container_of(dev, struct jz_gpio_chip, sysdev);
> + chip->suspend_mask = readl(chip->base + JZ_REG_GPIO_MASK);
> + writel(~(chip->wakeup), chip->base + JZ_REG_GPIO_MASK_SET);
> + writel(chip->wakeup, chip->base + JZ_REG_GPIO_MASK_CLEAR);
> }
>
> -static int jz4740_gpio_suspend(struct sys_device *dev, pm_message_t state)
> +static int jz4740_gpio_suspend(void)
> {
> - struct jz_gpio_chip *chip = sysdev_to_chip(dev);
> + int i;
>
> - chip->suspend_mask = readl(chip->base + JZ_REG_GPIO_MASK);
> - writel(~(chip->wakeup), chip->base + JZ_REG_GPIO_MASK_SET);
> - writel(chip->wakeup, chip->base + JZ_REG_GPIO_MASK_CLEAR);
> + for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); i++)
> + jz4740_gpio_suspend_chip(&jz4740_gpio_chips[i]);
>
> return 0;
> }
>
> -static int jz4740_gpio_resume(struct sys_device *dev)
> +static void jz4740_gpio_resume_chip(struct jz_gpio_chip *chip)
> {
> - struct jz_gpio_chip *chip = sysdev_to_chip(dev);
> uint32_t mask = chip->suspend_mask;
>
> writel(~mask, chip->base + JZ_REG_GPIO_MASK_CLEAR);
> writel(mask, chip->base + JZ_REG_GPIO_MASK_SET);
> +}
>
> - return 0;
> +static void jz4740_gpio_resume(void)
> +{
> + int i;
> +
> + for (i = ARRAY_SIZE(jz4740_gpio_chips) - 1; i >= 0 ; i--)
> + jz4740_gpio_resume_chip(&jz4740_gpio_chips[i]);
> }
>
> -static struct sysdev_class jz4740_gpio_sysdev_class = {
> - .name = "gpio",
> +static struct syscore_ops jz4740_gpio_syscore_ops = {
> .suspend = jz4740_gpio_suspend,
> .resume = jz4740_gpio_resume,
> };
>
> -static int jz4740_gpio_chip_init(struct jz_gpio_chip *chip, unsigned int id)
> +static void jz4740_gpio_chip_init(struct jz_gpio_chip *chip, unsigned int id)
> {
> - int ret, irq;
> -
> - chip->sysdev.id = id;
> - chip->sysdev.cls = &jz4740_gpio_sysdev_class;
> - ret = sysdev_register(&chip->sysdev);
> -
> - if (ret)
> - return ret;
> + int irq;
>
> spin_lock_init(&chip->lock);
>
> @@ -519,22 +516,17 @@ static int jz4740_gpio_chip_init(struct
> irq_set_chip_and_handler(irq, &jz_gpio_irq_chip,
> handle_level_irq);
> }
> -
> - return 0;
> }
>
> static int __init jz4740_gpio_init(void)
> {
> unsigned int i;
> - int ret;
> -
> - ret = sysdev_class_register(&jz4740_gpio_sysdev_class);
> - if (ret)
> - return ret;
>
> for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i)
> jz4740_gpio_chip_init(&jz4740_gpio_chips[i], i);
>
> + register_syscore_ops(&jz4740_gpio_syscore_ops);
> +
> printk(KERN_INFO "JZ4740 GPIO initialized\n");
>
> return 0;
> Index: linux-2.6/arch/mips/kernel/i8259.c
> ===================================================================
> --- linux-2.6.orig/arch/mips/kernel/i8259.c
> +++ linux-2.6/arch/mips/kernel/i8259.c
> @@ -14,7 +14,7 @@
> #include <linux/interrupt.h>
> #include <linux/kernel.h>
> #include <linux/spinlock.h>
> -#include <linux/sysdev.h>
> +#include <linux/syscore_ops.h>
> #include <linux/irq.h>
>
> #include <asm/i8259.h>
> @@ -215,14 +215,13 @@ spurious_8259A_irq:
> }
> }
>
> -static int i8259A_resume(struct sys_device *dev)
> +static void i8259A_resume(void)
> {
> if (i8259A_auto_eoi >= 0)
> init_8259A(i8259A_auto_eoi);
> - return 0;
> }
>
> -static int i8259A_shutdown(struct sys_device *dev)
> +static void i8259A_shutdown(void)
> {
> /* Put the i8259A into a quiescent state that
> * the kernel initialization code can get it
> @@ -232,29 +231,20 @@ static int i8259A_shutdown(struct sys_de
> outb(0xff, PIC_MASTER_IMR); /* mask all of 8259A-1 */
> outb(0xff, PIC_SLAVE_IMR); /* mask all of 8259A-1 */
> }
> - return 0;
> }
>
> -static struct sysdev_class i8259_sysdev_class = {
> - .name = "i8259",
> +static struct syscore_ops i8259_syscore_ops = {
> .resume = i8259A_resume,
> .shutdown = i8259A_shutdown,
> };
>
> -static struct sys_device device_i8259A = {
> - .id = 0,
> - .cls = &i8259_sysdev_class,
> -};
> -
> -static int __init i8259A_init_sysfs(void)
> +static int __init i8259A_init_syscore(void)
> {
> - int error = sysdev_class_register(&i8259_sysdev_class);
> - if (!error)
> - error = sysdev_register(&device_i8259A);
> - return error;
> + register_syscore_ops(&i8259_syscore_ops);
> + return 0;
> }
>
> -device_initcall(i8259A_init_sysfs);
> +device_initcall(i8259A_init_syscore);
>
> static void init_8259A(int auto_eoi)
> {
>
> --
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