diff options
Diffstat (limited to 'arch/blackfin/mach-bf609/pm.c')
| -rw-r--r-- | arch/blackfin/mach-bf609/pm.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf609/pm.c b/arch/blackfin/mach-bf609/pm.c new file mode 100644 index 000000000000..bbc5a79b5e22 --- /dev/null +++ b/arch/blackfin/mach-bf609/pm.c @@ -0,0 +1,310 @@ +/* + * Blackfin bf609 power management + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2 + */ + +#include <linux/suspend.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/gpio.h> +#include <linux/irq.h> + +#include <linux/delay.h> + +#include <asm/dpmc.h> +#include <asm/pm.h> +#include <mach/pm.h> +#include <asm/blackfin.h> + +/***********************************************************/ +/* */ +/* Wakeup Actions for DPM_RESTORE */ +/* */ +/***********************************************************/ +#define BITP_ROM_WUA_CHKHDR 24 +#define BITP_ROM_WUA_DDRLOCK 7 +#define BITP_ROM_WUA_DDRDLLEN 6 +#define BITP_ROM_WUA_DDR 5 +#define BITP_ROM_WUA_CGU 4 +#define BITP_ROM_WUA_MEMBOOT 2 +#define BITP_ROM_WUA_EN 1 + +#define BITM_ROM_WUA_CHKHDR (0xFF000000) +#define ENUM_ROM_WUA_CHKHDR_AD 0xAD000000 + +#define BITM_ROM_WUA_DDRLOCK (0x00000080) +#define BITM_ROM_WUA_DDRDLLEN (0x00000040) +#define BITM_ROM_WUA_DDR (0x00000020) +#define BITM_ROM_WUA_CGU (0x00000010) +#define BITM_ROM_WUA_MEMBOOT (0x00000002) +#define BITM_ROM_WUA_EN (0x00000001) + +/***********************************************************/ +/* */ +/* Syscontrol */ +/* */ +/***********************************************************/ +#define BITP_ROM_SYSCTRL_CGU_LOCKINGEN 28 /* unlocks CGU_CTL register */ +#define BITP_ROM_SYSCTRL_WUA_OVERRIDE 24 +#define BITP_ROM_SYSCTRL_WUA_DDRDLLEN 20 /* Saves the DDR DLL and PADS registers to the DPM registers */ +#define BITP_ROM_SYSCTRL_WUA_DDR 19 /* Saves the DDR registers to the DPM registers */ +#define BITP_ROM_SYSCTRL_WUA_CGU 18 /* Saves the CGU registers into DPM registers */ +#define BITP_ROM_SYSCTRL_WUA_DPMWRITE 17 /* Saves the Syscontrol structure structure contents into DPM registers */ +#define BITP_ROM_SYSCTRL_WUA_EN 16 /* reads current PLL and DDR configuration into structure */ +#define BITP_ROM_SYSCTRL_DDR_WRITE 13 /* writes the DDR registers from Syscontrol structure for wakeup initialization of DDR */ +#define BITP_ROM_SYSCTRL_DDR_READ 12 /* Read the DDR registers into the Syscontrol structure for storing prior to hibernate */ +#define BITP_ROM_SYSCTRL_CGU_AUTODIS 11 /* Disables auto handling of UPDT and ALGN fields */ +#define BITP_ROM_SYSCTRL_CGU_CLKOUTSEL 7 /* access CGU_CLKOUTSEL register */ +#define BITP_ROM_SYSCTRL_CGU_DIV 6 /* access CGU_DIV register */ +#define BITP_ROM_SYSCTRL_CGU_STAT 5 /* access CGU_STAT register */ +#define BITP_ROM_SYSCTRL_CGU_CTL 4 /* access CGU_CTL register */ +#define BITP_ROM_SYSCTRL_CGU_RTNSTAT 2 /* Update structure STAT field upon error */ +#define BITP_ROM_SYSCTRL_WRITE 1 /* write registers */ +#define BITP_ROM_SYSCTRL_READ 0 /* read registers */ + +#define BITM_ROM_SYSCTRL_CGU_READ (0x00000001) /* Read CGU registers */ +#define BITM_ROM_SYSCTRL_CGU_WRITE (0x00000002) /* Write registers */ +#define BITM_ROM_SYSCTRL_CGU_RTNSTAT (0x00000004) /* Update structure STAT field upon error or after a write operation */ +#define BITM_ROM_SYSCTRL_CGU_CTL (0x00000010) /* Access CGU_CTL register */ +#define BITM_ROM_SYSCTRL_CGU_STAT (0x00000020) /* Access CGU_STAT register */ +#define BITM_ROM_SYSCTRL_CGU_DIV (0x00000040) /* Access CGU_DIV register */ +#define BITM_ROM_SYSCTRL_CGU_CLKOUTSEL (0x00000080) /* Access CGU_CLKOUTSEL register */ +#define BITM_ROM_SYSCTRL_CGU_AUTODIS (0x00000800) /* Disables auto handling of UPDT and ALGN fields */ +#define BITM_ROM_SYSCTRL_DDR_READ (0x00001000) /* Reads the contents of the DDR registers and stores them into the structure */ +#define BITM_ROM_SYSCTRL_DDR_WRITE (0x00002000) /* Writes the DDR registers from the structure, only really intented for wakeup functionality and not for full DDR configuration */ +#define BITM_ROM_SYSCTRL_WUA_EN (0x00010000) /* Wakeup entry or exit opertation enable */ +#define BITM_ROM_SYSCTRL_WUA_DPMWRITE (0x00020000) /* When set indicates a restore of the PLL and DDR is to be performed otherwise a save is required */ +#define BITM_ROM_SYSCTRL_WUA_CGU (0x00040000) /* Only applicable for a PLL and DDR save operation to the DPM, saves the current settings if cleared or the contents of the structure if set */ +#define BITM_ROM_SYSCTRL_WUA_DDR (0x00080000) /* Only applicable for a PLL and DDR save operation to the DPM, saves the current settings if cleared or the contents of the structure if set */ +#define BITM_ROM_SYSCTRL_WUA_DDRDLLEN (0x00100000) /* Enables saving/restoring of the DDR DLLCTL register */ +#define BITM_ROM_SYSCTRL_WUA_OVERRIDE (0x01000000) +#define BITM_ROM_SYSCTRL_CGU_LOCKINGEN (0x10000000) /* Unlocks the CGU_CTL register */ + + +/* Structures for the syscontrol() function */ +struct STRUCT_ROM_SYSCTRL { + uint32_t ulCGU_CTL; + uint32_t ulCGU_STAT; + uint32_t ulCGU_DIV; + uint32_t ulCGU_CLKOUTSEL; + uint32_t ulWUA_Flags; + uint32_t ulWUA_BootAddr; + uint32_t ulWUA_User; + uint32_t ulDDR_CTL; + uint32_t ulDDR_CFG; + uint32_t ulDDR_TR0; + uint32_t ulDDR_TR1; + uint32_t ulDDR_TR2; + uint32_t ulDDR_MR; + uint32_t ulDDR_EMR1; + uint32_t ulDDR_EMR2; + uint32_t ulDDR_PADCTL; + uint32_t ulDDR_DLLCTL; + uint32_t ulReserved; +}; + +struct bfin_pm_data { + uint32_t magic; + uint32_t resume_addr; + uint32_t sp; +}; + +struct bfin_pm_data bf609_pm_data; + +struct STRUCT_ROM_SYSCTRL configvalues; +uint32_t dactionflags; + +#define FUNC_ROM_SYSCONTROL 0xC8000080 +__attribute__((l1_data)) +static uint32_t (* const bfrom_SysControl)(uint32_t action_flags, struct STRUCT_ROM_SYSCTRL *settings, void *reserved) = (void *)FUNC_ROM_SYSCONTROL; + +__attribute__((l1_text)) +void bfin_cpu_suspend(void) +{ + __asm__ __volatile__( \ + ".align 8;" \ + "idle;" \ + : : \ + ); +} + +__attribute__((l1_text)) +void bfin_deepsleep(unsigned long mask) +{ + uint32_t dpm0_ctl; + + bfin_write32(DPM0_WAKE_EN, 0x10); + bfin_write32(DPM0_WAKE_POL, 0x10); + dpm0_ctl = bfin_read32(DPM0_CTL); + dpm0_ctl = 0x00000008; + bfin_write32(DPM0_CTL, dpm0_ctl); + SSYNC(); + __asm__ __volatile__( \ + ".align 8;" \ + "idle;" \ + : : \ + ); +} + +__attribute__((l1_text)) +void bf609_ddr_sr(void) +{ + uint32_t reg; + + reg = bfin_read_DDR0_CTL(); + reg |= 0x8; + bfin_write_DDR0_CTL(reg); + + while (!(bfin_read_DDR0_STAT() & 0x8)) + continue; +} + +__attribute__((l1_text)) +void bf609_ddr_sr_exit(void) +{ + uint32_t reg; + while (!(bfin_read_DDR0_STAT() & 0x1)) + continue; + + reg = bfin_read_DDR0_CTL(); + reg &= ~0x8; + bfin_write_DDR0_CTL(reg); + + while ((bfin_read_DDR0_STAT() & 0x8)) + continue; +} + +__attribute__((l1_text)) +void bfin_hibernate_syscontrol(void) +{ + configvalues.ulWUA_Flags = (0xAD000000 | BITM_ROM_WUA_EN + | BITM_ROM_WUA_CGU | BITM_ROM_WUA_DDR | BITM_ROM_WUA_DDRDLLEN); + + dactionflags = (BITM_ROM_SYSCTRL_WUA_EN + | BITM_ROM_SYSCTRL_WUA_DPMWRITE | BITM_ROM_SYSCTRL_WUA_CGU + | BITM_ROM_SYSCTRL_WUA_DDR | BITM_ROM_SYSCTRL_WUA_DDRDLLEN); + + bfrom_SysControl(dactionflags, &configvalues, NULL); + + bfin_write32(DPM0_RESTORE5, bfin_read32(DPM0_RESTORE5) | 4); +} + +#ifndef CONFIG_BF60x +# define SIC_SYSIRQ(irq) (irq - (IRQ_CORETMR + 1)) +#else +# define SIC_SYSIRQ(irq) ((irq) - IVG15) +#endif +void bfin_hibernate(unsigned long mask) +{ + bfin_write32(DPM0_WAKE_EN, 0x10); + bfin_write32(DPM0_WAKE_POL, 0x10); + bfin_write32(DPM0_PGCNTR, 0x0000FFFF); + bfin_write32(DPM0_HIB_DIS, 0xFFFF); + + printk(KERN_DEBUG "hibernate: restore %x pgcnt %x\n", bfin_read32(DPM0_RESTORE0), bfin_read32(DPM0_PGCNTR)); + + bf609_hibernate(); +} + +void bf609_cpu_pm_enter(suspend_state_t state) +{ + int error; + error = irq_set_irq_wake(255, 1); + if(error < 0) + printk(KERN_DEBUG "Unable to get irq wake\n"); + error = irq_set_irq_wake(231, 1); + if (error < 0) + printk(KERN_DEBUG "Unable to get irq wake\n"); + + if (state == PM_SUSPEND_STANDBY) + bfin_deepsleep(0xffff); + else { + bfin_hibernate(0xffff); + } +} + +int bf609_cpu_pm_prepare(void) +{ + return 0; +} + +void bf609_cpu_pm_finish(void) +{ + +} + +static struct bfin_cpu_pm_fns bf609_cpu_pm = { + .enter = bf609_cpu_pm_enter, + .prepare = bf609_cpu_pm_prepare, + .finish = bf609_cpu_pm_finish, +}; + +static irqreturn_t test_isr(int irq, void *dev_id) +{ + printk(KERN_DEBUG "gpio irq %d\n", irq); + return IRQ_HANDLED; +} + +static irqreturn_t dpm0_isr(int irq, void *dev_id) +{ + uint32_t wake_stat; + + wake_stat = bfin_read32(DPM0_WAKE_STAT); + printk(KERN_DEBUG "enter %s wake stat %08x\n", __func__, wake_stat); + + bfin_write32(DPM0_WAKE_STAT, wake_stat); + return IRQ_HANDLED; +} + +static int __init bf609_init_pm(void) +{ + int irq; + int error; + error = gpio_request(GPIO_PG4, "gpiopg4"); + if (error < 0) { + printk(KERN_DEBUG "failed to request GPIO %d, error %d\n", + GPIO_PG4, error); + } + + irq = gpio_to_irq(GPIO_PG4); + if (irq < 0) { + error = irq; + printk(KERN_DEBUG "Unable to get irq number for GPIO %d, error %d\n", + GPIO_PG4, error); + } + + printk(KERN_DEBUG "%s gpio %d irq %d\n", __func__, GPIO_PG4, irq); + + error = request_irq(irq, test_isr, IRQF_TRIGGER_FALLING | IRQF_NO_SUSPEND, "gpiopg4", NULL); + if(error < 0) + printk(KERN_DEBUG "Unable to get irq\n"); + +#if 1 + irq = gpio_to_irq(GPIO_PE12); + if (irq < 0) { + error = irq; + printk(KERN_DEBUG "Unable to get irq number for GPIO %d, error %d\n", + GPIO_PE12, error); + } + + error = request_irq(irq, test_isr, IRQF_TRIGGER_RISING | IRQF_NO_SUSPEND, "gpiope12", NULL); + if(error < 0) + printk(KERN_DEBUG "Unable to get irq\n"); +#endif + + error = request_irq(IRQ_CGU_EVT, dpm0_isr, IRQF_NO_SUSPEND, "cgu0 event", NULL); + if(error < 0) + printk(KERN_DEBUG "Unable to get irq\n"); + + error = request_irq(IRQ_DPM, dpm0_isr, IRQF_NO_SUSPEND, "dpm0 event", NULL); + if (error < 0) + printk(KERN_DEBUG "Unable to get irq\n"); + + bfin_cpu_pm = &bf609_cpu_pm; + return 0; +} + +late_initcall(bf609_init_pm); |