diff options
Diffstat (limited to 'arch/arm/mach-s3c/pm-s3c2410.c')
| -rw-r--r-- | arch/arm/mach-s3c/pm-s3c2410.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c/pm-s3c2410.c b/arch/arm/mach-s3c/pm-s3c2410.c new file mode 100644 index 000000000..a66419883 --- /dev/null +++ b/arch/arm/mach-s3c/pm-s3c2410.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright (c) 2006 Simtec Electronics +// Ben Dooks <ben@simtec.co.uk> +// +// S3C2410 (and compatible) Power Manager (Suspend-To-RAM) support + +#include <linux/init.h> +#include <linux/suspend.h> +#include <linux/errno.h> +#include <linux/time.h> +#include <linux/device.h> +#include <linux/syscore_ops.h> +#include <linux/gpio.h> +#include <linux/io.h> + +#include <asm/mach-types.h> + +#include "regs-gpio.h" +#include "gpio-samsung.h" + +#include "gpio-cfg.h" +#include "cpu.h" +#include "pm.h" + +#include "h1940.h" + +static void s3c2410_pm_prepare(void) +{ + /* ensure at least GSTATUS3 has the resume address */ + + __raw_writel(__pa_symbol(s3c_cpu_resume), S3C2410_GSTATUS3); + + S3C_PMDBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3)); + S3C_PMDBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4)); + + if (machine_is_h1940()) { + void *base = phys_to_virt(H1940_SUSPEND_CHECK); + unsigned long ptr; + unsigned long calc = 0; + + /* generate check for the bootloader to check on resume */ + + for (ptr = 0; ptr < 0x40000; ptr += 0x400) + calc += __raw_readl(base+ptr); + + __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM)); + } + + /* RX3715 and RX1950 use similar to H1940 code and the + * same offsets for resume and checksum pointers */ + + if (machine_is_rx3715() || machine_is_rx1950()) { + void *base = phys_to_virt(H1940_SUSPEND_CHECK); + unsigned long ptr; + unsigned long calc = 0; + + /* generate check for the bootloader to check on resume */ + + for (ptr = 0; ptr < 0x40000; ptr += 0x4) + calc += __raw_readl(base+ptr); + + __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM)); + } + + if (machine_is_aml_m5900()) { + gpio_request_one(S3C2410_GPF(2), GPIOF_OUT_INIT_HIGH, NULL); + gpio_free(S3C2410_GPF(2)); + } + + if (machine_is_rx1950()) { + /* According to S3C2442 user's manual, page 7-17, + * when the system is operating in NAND boot mode, + * the hardware pin configuration - EINT[23:21] – + * must be set as input for starting up after + * wakeup from sleep mode + */ + s3c_gpio_cfgpin(S3C2410_GPG(13), S3C2410_GPIO_INPUT); + s3c_gpio_cfgpin(S3C2410_GPG(14), S3C2410_GPIO_INPUT); + s3c_gpio_cfgpin(S3C2410_GPG(15), S3C2410_GPIO_INPUT); + } +} + +static void s3c2410_pm_resume(void) +{ + unsigned long tmp; + + /* unset the return-from-sleep flag, to ensure reset */ + + tmp = __raw_readl(S3C2410_GSTATUS2); + tmp &= S3C2410_GSTATUS2_OFFRESET; + __raw_writel(tmp, S3C2410_GSTATUS2); + + if (machine_is_aml_m5900()) { + gpio_request_one(S3C2410_GPF(2), GPIOF_OUT_INIT_LOW, NULL); + gpio_free(S3C2410_GPF(2)); + } +} + +struct syscore_ops s3c2410_pm_syscore_ops = { + .resume = s3c2410_pm_resume, +}; + +static int s3c2410_pm_add(struct device *dev, struct subsys_interface *sif) +{ + pm_cpu_prep = s3c2410_pm_prepare; + pm_cpu_sleep = s3c2410_cpu_suspend; + + return 0; +} + +#if defined(CONFIG_CPU_S3C2410) +static struct subsys_interface s3c2410_pm_interface = { + .name = "s3c2410_pm", + .subsys = &s3c2410_subsys, + .add_dev = s3c2410_pm_add, +}; + +/* register ourselves */ + +static int __init s3c2410_pm_drvinit(void) +{ + return subsys_interface_register(&s3c2410_pm_interface); +} + +arch_initcall(s3c2410_pm_drvinit); + +static struct subsys_interface s3c2410a_pm_interface = { + .name = "s3c2410a_pm", + .subsys = &s3c2410a_subsys, + .add_dev = s3c2410_pm_add, +}; + +static int __init s3c2410a_pm_drvinit(void) +{ + return subsys_interface_register(&s3c2410a_pm_interface); +} + +arch_initcall(s3c2410a_pm_drvinit); +#endif + +#if defined(CONFIG_CPU_S3C2440) +static struct subsys_interface s3c2440_pm_interface = { + .name = "s3c2440_pm", + .subsys = &s3c2440_subsys, + .add_dev = s3c2410_pm_add, +}; + +static int __init s3c2440_pm_drvinit(void) +{ + return subsys_interface_register(&s3c2440_pm_interface); +} + +arch_initcall(s3c2440_pm_drvinit); +#endif + +#if defined(CONFIG_CPU_S3C2442) +static struct subsys_interface s3c2442_pm_interface = { + .name = "s3c2442_pm", + .subsys = &s3c2442_subsys, + .add_dev = s3c2410_pm_add, +}; + +static int __init s3c2442_pm_drvinit(void) +{ + return subsys_interface_register(&s3c2442_pm_interface); +} + +arch_initcall(s3c2442_pm_drvinit); +#endif |