diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mfd/sm501.c | 113 |
1 files changed, 105 insertions, 8 deletions
diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c index b0b4458ae90..72bbecf4b45 100644 --- a/drivers/mfd/sm501.c +++ b/drivers/mfd/sm501.c @@ -41,6 +41,9 @@ struct sm501_devdata { struct resource *regs_claim; struct sm501_platdata *platdata; + unsigned int in_suspend; + unsigned long pm_misc; + int unit_power[20]; unsigned int pdev_id; unsigned int irq; @@ -169,10 +172,41 @@ x "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n", fmt_freq(decode_div(pll2, pm1, 8, 1<<12, 15, misc_div)), fmt_freq(decode_div(pll2, pm1, 0, 1<<4, 15, misc_div))); } -#else -static void sm501_dump_clk(struct sm501_devdata *sm) + +static void sm501_dump_regs(struct sm501_devdata *sm) +{ + void __iomem *regs = sm->regs; + + dev_info(sm->dev, "System Control %08x\n", + readl(regs + SM501_SYSTEM_CONTROL)); + dev_info(sm->dev, "Misc Control %08x\n", + readl(regs + SM501_MISC_CONTROL)); + dev_info(sm->dev, "GPIO Control Low %08x\n", + readl(regs + SM501_GPIO31_0_CONTROL)); + dev_info(sm->dev, "GPIO Control Hi %08x\n", + readl(regs + SM501_GPIO63_32_CONTROL)); + dev_info(sm->dev, "DRAM Control %08x\n", + readl(regs + SM501_DRAM_CONTROL)); + dev_info(sm->dev, "Arbitration Ctrl %08x\n", + readl(regs + SM501_ARBTRTN_CONTROL)); + dev_info(sm->dev, "Misc Timing %08x\n", + readl(regs + SM501_MISC_TIMING)); +} + +static void sm501_dump_gate(struct sm501_devdata *sm) { + dev_info(sm->dev, "CurrentGate %08x\n", + readl(sm->regs + SM501_CURRENT_GATE)); + dev_info(sm->dev, "CurrentClock %08x\n", + readl(sm->regs + SM501_CURRENT_CLOCK)); + dev_info(sm->dev, "PowerModeControl %08x\n", + readl(sm->regs + SM501_POWER_MODE_CONTROL)); } + +#else +static inline void sm501_dump_gate(struct sm501_devdata *sm) { } +static inline void sm501_dump_regs(struct sm501_devdata *sm) { } +static inline void sm501_dump_clk(struct sm501_devdata *sm) { } #endif /* sm501_sync_regs @@ -185,9 +219,21 @@ static void sm501_sync_regs(struct sm501_devdata *sm) readl(sm->regs); } +static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay) +{ + /* during suspend/resume, we are currently not allowed to sleep, + * so change to using mdelay() instead of msleep() if we + * are in one of these paths */ + + if (sm->in_suspend) + mdelay(delay); + else + msleep(delay); +} + /* sm501_misc_control * - * alters the misceleneous control parameters + * alters the miscellaneous control parameters */ int sm501_misc_control(struct device *dev, @@ -368,7 +414,7 @@ int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to) dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n", gate, clock, mode); - msleep(16); + sm501_mdelay(sm, 16); already: mutex_unlock(&sm->clock_lock); @@ -538,7 +584,7 @@ unsigned long sm501_set_clock(struct device *dev, dev_info(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n", gate, clock, mode); - msleep(16); + sm501_mdelay(sm, 16); mutex_unlock(&sm->clock_lock); sm501_dump_clk(sm); @@ -841,9 +887,7 @@ static int sm501_init_dev(struct sm501_devdata *sm) sm->regs, readl(sm->regs + SM501_DEVICEID), (unsigned long)mem_avail >> 20, sm->irq); - dev_info(sm->dev, "CurrentGate %08x\n", readl(sm->regs+0x38)); - dev_info(sm->dev, "CurrentClock %08x\n", readl(sm->regs+0x3c)); - dev_info(sm->dev, "PowerModeControl %08x\n", readl(sm->regs+0x54)); + sm501_dump_gate(sm); ret = device_create_file(sm->dev, &dev_attr_dbg_regs); if (ret) @@ -933,6 +977,57 @@ static int sm501_plat_probe(struct platform_device *dev) } +#ifdef CONFIG_PM +/* power management support */ + +static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct sm501_devdata *sm = platform_get_drvdata(pdev); + + sm->in_suspend = 1; + sm->pm_misc = readl(sm->regs + SM501_MISC_CONTROL); + + sm501_dump_regs(sm); + return 0; +} + +static int sm501_plat_resume(struct platform_device *pdev) +{ + struct sm501_devdata *sm = platform_get_drvdata(pdev); + + sm501_dump_regs(sm); + sm501_dump_gate(sm); + sm501_dump_clk(sm); + + /* check to see if we are in the same state as when suspended */ + + if (readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) { + dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n"); + writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL); + + /* our suspend causes the controller state to change, + * either by something attempting setup, power loss, + * or an external reset event on power change */ + + if (sm->platdata && sm->platdata->init) { + sm501_init_regs(sm, sm->platdata->init); + } + } + + /* dump our state from resume */ + + sm501_dump_regs(sm); + sm501_dump_clk(sm); + + sm->in_suspend = 0; + + return 0; +} +#else +#define sm501_plat_suspend NULL +#define sm501_plat_resume NULL +#endif + /* Initialisation data for PCI devices */ static struct sm501_initdata sm501_pci_initdata = { @@ -1126,6 +1221,8 @@ static struct platform_driver sm501_plat_drv = { }, .probe = sm501_plat_probe, .remove = sm501_plat_remove, + .suspend = sm501_plat_suspend, + .resume = sm501_plat_resume, }; static int __init sm501_base_init(void) |