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authorBen Dooks <ben-linux@fluff.org>2007-06-23 17:16:28 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-24 08:59:11 -0700
commit331d74750e69a2202f857d3af9323335d0d6879f (patch)
tree1508b5d183c18d29a54271153e0f8c49546d9013 /drivers/mfd
parent1ed8a2b3c501bedd4b35130c8a52662ccf78abad (diff)
SM501: suspend support
This patch adds support for suspending the core (mfd driver) of the SM501. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/sm501.c113
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)