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Date: Fri, 20 Jul 2012 20:42:38 +0800
From: Zhao Chenhui <chenhui.zhao@...escale.com>
To: <linuxppc-dev@...ts.ozlabs.org>, <scottwood@...escale.com>,
<galak@...nel.crashing.org>
CC: <linux-kernel@...r.kernel.org>, <leoli@...escale.com>
Subject: [PATCH v8 6/7] fsl_pmc: Add API to enable device as wakeup event source
Add APIs for setting wakeup source and lossless Ethernet in low power modes.
These APIs can be used by wake-on-packet feature.
Signed-off-by: Dave Liu <daveliu@...escale.com>
Signed-off-by: Li Yang <leoli@...escale.com>
Signed-off-by: Jin Qing <b24347@...escale.com>
Signed-off-by: Zhao Chenhui <chenhui.zhao@...escale.com>
---
arch/powerpc/sysdev/fsl_pmc.c | 77 ++++++++++++++++++++++++++++++++++++++++-
arch/powerpc/sysdev/fsl_soc.h | 12 ++++++
2 files changed, 88 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/sysdev/fsl_pmc.c b/arch/powerpc/sysdev/fsl_pmc.c
index 45718c5..b6c8c8f 100644
--- a/arch/powerpc/sysdev/fsl_pmc.c
+++ b/arch/powerpc/sysdev/fsl_pmc.c
@@ -38,6 +38,7 @@ struct pmc_regs {
__be32 powmgtcsr;
#define POWMGTCSR_SLP 0x00020000
#define POWMGTCSR_DPSLP 0x00100000
+#define POWMGTCSR_LOSSLESS 0x00400000
__be32 res3[2];
/* 0xe008c: Power management clock disable register */
__be32 pmcdr;
@@ -48,6 +49,77 @@ static unsigned int pmc_flag;
#define PMC_SLEEP 0x1
#define PMC_DEEP_SLEEP 0x2
+#define PMC_LOSSLESS 0x4
+
+#define PMCDR_MASK_INIT 0x00e008e0
+
+/**
+ * mpc85xx_pmc_set_wake - enable devices as wakeup event source
+ * @dev: a device affected
+ * @enable: True to enable event generation; false to disable
+ *
+ * This enables the device as a wakeup event source, or disables it.
+ *
+ * RETURN VALUE:
+ * 0 is returned on success.
+ * -EINVAL is returned if device is not supposed to wake up the system.
+ * -ENODEV is returned if PMC is unavailable.
+ * Error code depending on the platform is returned if both the platform and
+ * the native mechanism fail to enable the generation of wake-up events
+ */
+int mpc85xx_pmc_set_wake(struct device *dev, bool enable)
+{
+ int ret = 0;
+ struct device_node *clk_np;
+ const u32 *prop;
+ u32 pmcdr_mask;
+
+ if (!pmc_regs) {
+ pr_err("%s: PMC is unavailable\n", __func__);
+ return -ENODEV;
+ }
+
+ if (enable && !device_may_wakeup(dev))
+ return -EINVAL;
+
+ clk_np = of_parse_phandle(dev->of_node, "fsl,pmc-handle", 0);
+ if (!clk_np)
+ return -EINVAL;
+
+ prop = of_get_property(clk_np, "fsl,pmcdr-mask", NULL);
+ if (!prop) {
+ ret = -EINVAL;
+ goto out;
+ }
+ pmcdr_mask = be32_to_cpup(prop);
+
+ if (enable)
+ /* clear to enable clock in low power mode */
+ clrbits32(&pmc_regs->pmcdr, pmcdr_mask);
+ else
+ setbits32(&pmc_regs->pmcdr, pmcdr_mask);
+
+out:
+ of_node_put(clk_np);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mpc85xx_pmc_set_wake);
+
+/**
+ * mpc85xx_pmc_set_lossless_ethernet - enable lossless ethernet
+ * in (deep) sleep mode
+ * @enable: True to enable event generation; false to disable
+ */
+void mpc85xx_pmc_set_lossless_ethernet(int enable)
+{
+ if (pmc_flag & PMC_LOSSLESS) {
+ if (enable)
+ setbits32(&pmc_regs->powmgtcsr, POWMGTCSR_LOSSLESS);
+ else
+ clrbits32(&pmc_regs->powmgtcsr, POWMGTCSR_LOSSLESS);
+ }
+}
+EXPORT_SYMBOL_GPL(mpc85xx_pmc_set_lossless_ethernet);
static int pmc_suspend_enter(suspend_state_t state)
{
@@ -123,7 +195,10 @@ static int pmc_probe(struct platform_device *pdev)
pmc_flag |= PMC_DEEP_SLEEP;
if (of_device_is_compatible(np, "fsl,p1022-pmc"))
- pmc_flag |= PMC_DEEP_SLEEP;
+ pmc_flag |= PMC_DEEP_SLEEP | PMC_LOSSLESS;
+
+ /* Init the Power Management Clock Disable Register. */
+ setbits32(&pmc_regs->pmcdr, PMCDR_MASK_INIT);
suspend_set_ops(&pmc_suspend_ops);
diff --git a/arch/powerpc/sysdev/fsl_soc.h b/arch/powerpc/sysdev/fsl_soc.h
index 11d9f94..b1510ef 100644
--- a/arch/powerpc/sysdev/fsl_soc.h
+++ b/arch/powerpc/sysdev/fsl_soc.h
@@ -3,6 +3,7 @@
#ifdef __KERNEL__
#include <asm/mmu.h>
+#include <linux/platform_device.h>
struct spi_device;
@@ -21,6 +22,17 @@ struct device_node;
extern void fsl_rstcr_restart(char *cmd);
+#ifdef CONFIG_FSL_PMC
+extern int mpc85xx_pmc_set_wake(struct device *dev, bool enable);
+extern void mpc85xx_pmc_set_lossless_ethernet(int enable);
+#else
+static inline int mpc85xx_pmc_set_wake(struct device *dev, bool enable)
+{
+ return -ENODEV;
+}
+#define mpc85xx_pmc_set_lossless_ethernet(enable) do { } while (0)
+#endif
+
#if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE)
/* The different ports that the DIU can be connected to */
--
1.6.4.1
--
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