This patch adds support for suspending the core
(mfd driver) of the SM501.
Signed-off-by: Ben Dooks <[email protected]>
Index: linux-2.6.21-quilt8/drivers/mfd/sm501.c
===================================================================
--- linux-2.6.21-quilt8.orig/drivers/mfd/sm501.c 2007-06-04 16:06:29.000000000 +0100
+++ linux-2.6.21-quilt8/drivers/mfd/sm501.c 2007-06-13 13:25:50.000000000 +0100
@@ -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 +172,31 @@ x "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\
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 +209,21 @@ static void sm501_sync_regs(struct sm501
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 +404,7 @@ int sm501_unit_power(struct device *dev,
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 +574,7 @@ unsigned long sm501_set_clock(struct 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 +877,7 @@ static int sm501_init_dev(struct sm501_d
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 +967,53 @@ static int sm501_plat_probe(struct platf
}
+/* 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;
+}
+
+
/* Initialisation data for PCI devices */
static struct sm501_initdata sm501_pci_initdata = {
@@ -1126,6 +1207,8 @@ static struct platform_driver sm501_plat
},
.probe = sm501_plat_probe,
.remove = sm501_plat_remove,
+ .suspend = sm501_plat_suspend,
+ .resume = sm501_plat_resume,
};
static int __init sm501_base_init(void)
--
Ben ([email protected], http://www.fluff.org/)
'a smiley only costs 4 bytes'
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