diff options
Diffstat (limited to 'arch/arm/mach-davinci/pm.c')
| -rw-r--r-- | arch/arm/mach-davinci/pm.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/pm.c b/arch/arm/mach-davinci/pm.c new file mode 100644 index 000000000..8aa39db09 --- /dev/null +++ b/arch/arm/mach-davinci/pm.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * DaVinci Power Management Routines + * + * Copyright (C) 2009 Texas Instruments, Inc. https://www.ti.com/ + */ + +#include <linux/pm.h> +#include <linux/suspend.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/spinlock.h> + +#include <asm/cacheflush.h> +#include <asm/delay.h> +#include <asm/io.h> + +#include "common.h" +#include "da8xx.h" +#include "mux.h" +#include "pm.h" +#include "clock.h" +#include "psc.h" +#include "sram.h" + +#define DA850_PLL1_BASE 0x01e1a000 +#define DEEPSLEEP_SLEEPCOUNT_MASK 0xFFFF +#define DEEPSLEEP_SLEEPCOUNT 128 + +static void (*davinci_sram_suspend) (struct davinci_pm_config *); +static struct davinci_pm_config pm_config = { + .sleepcount = DEEPSLEEP_SLEEPCOUNT, + .ddrpsc_num = DA8XX_LPSC1_EMIF3C, +}; + +static void davinci_sram_push(void *dest, void *src, unsigned int size) +{ + memcpy(dest, src, size); + flush_icache_range((unsigned long)dest, (unsigned long)(dest + size)); +} + +static void davinci_pm_suspend(void) +{ + unsigned val; + + if (pm_config.cpupll_reg_base != pm_config.ddrpll_reg_base) { + + /* Switch CPU PLL to bypass mode */ + val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL); + val &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN); + __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL); + + udelay(PLL_BYPASS_TIME); + + /* Powerdown CPU PLL */ + val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL); + val |= PLLCTL_PLLPWRDN; + __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL); + } + + /* Configure sleep count in deep sleep register */ + val = __raw_readl(pm_config.deepsleep_reg); + val &= ~DEEPSLEEP_SLEEPCOUNT_MASK, + val |= pm_config.sleepcount; + __raw_writel(val, pm_config.deepsleep_reg); + + /* System goes to sleep in this call */ + davinci_sram_suspend(&pm_config); + + if (pm_config.cpupll_reg_base != pm_config.ddrpll_reg_base) { + + /* put CPU PLL in reset */ + val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL); + val &= ~PLLCTL_PLLRST; + __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL); + + /* put CPU PLL in power down */ + val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL); + val &= ~PLLCTL_PLLPWRDN; + __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL); + + /* wait for CPU PLL reset */ + udelay(PLL_RESET_TIME); + + /* bring CPU PLL out of reset */ + val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL); + val |= PLLCTL_PLLRST; + __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL); + + /* Wait for CPU PLL to lock */ + udelay(PLL_LOCK_TIME); + + /* Remove CPU PLL from bypass mode */ + val = __raw_readl(pm_config.cpupll_reg_base + PLLCTL); + val &= ~PLLCTL_PLLENSRC; + val |= PLLCTL_PLLEN; + __raw_writel(val, pm_config.cpupll_reg_base + PLLCTL); + } +} + +static int davinci_pm_enter(suspend_state_t state) +{ + int ret = 0; + + switch (state) { + case PM_SUSPEND_MEM: + davinci_pm_suspend(); + break; + default: + ret = -EINVAL; + } + + return ret; +} + +static const struct platform_suspend_ops davinci_pm_ops = { + .enter = davinci_pm_enter, + .valid = suspend_valid_only_mem, +}; + +int __init davinci_pm_init(void) +{ + int ret; + + ret = davinci_cfg_reg(DA850_RTC_ALARM); + if (ret) + return ret; + + pm_config.ddr2_ctlr_base = da8xx_get_mem_ctlr(); + pm_config.deepsleep_reg = DA8XX_SYSCFG1_VIRT(DA8XX_DEEPSLEEP_REG); + + pm_config.cpupll_reg_base = ioremap(DA8XX_PLL0_BASE, SZ_4K); + if (!pm_config.cpupll_reg_base) + return -ENOMEM; + + pm_config.ddrpll_reg_base = ioremap(DA850_PLL1_BASE, SZ_4K); + if (!pm_config.ddrpll_reg_base) { + ret = -ENOMEM; + goto no_ddrpll_mem; + } + + pm_config.ddrpsc_reg_base = ioremap(DA8XX_PSC1_BASE, SZ_4K); + if (!pm_config.ddrpsc_reg_base) { + ret = -ENOMEM; + goto no_ddrpsc_mem; + } + + davinci_sram_suspend = sram_alloc(davinci_cpu_suspend_sz, NULL); + if (!davinci_sram_suspend) { + pr_err("PM: cannot allocate SRAM memory\n"); + ret = -ENOMEM; + goto no_sram_mem; + } + + davinci_sram_push(davinci_sram_suspend, davinci_cpu_suspend, + davinci_cpu_suspend_sz); + + suspend_set_ops(&davinci_pm_ops); + + return 0; + +no_sram_mem: + iounmap(pm_config.ddrpsc_reg_base); +no_ddrpsc_mem: + iounmap(pm_config.ddrpll_reg_base); +no_ddrpll_mem: + iounmap(pm_config.cpupll_reg_base); + return ret; +} |