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authorDaniel Mack <zonque@gmail.com>2013-11-26 13:31:14 +0100
committerFelipe Balbi <balbi@ti.com>2013-11-26 10:58:16 -0600
commit869c597829817af4b9f85c5e4181c622918dc781 (patch)
tree412253db26f14c15ec9f41a8302cf6e422e1a609
parentb991f9b77c029135f6e0d1d5d16869ebf755c4c0 (diff)
usb: musb: dsps: add support for suspend and resume
The dsps platform needs to save save some registers at suspend time and restore them after resume. This patch adds a struct for these registers, and also lets the musb core know that the core registers need to be saved as well. We also have to explicitly de-assert the port reset upon resume on this platform, but musb_port_reset() should not be called from glue layers. Hence, introduce a flag in struct musb_hdrc_config for this. Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
-rw-r--r--drivers/usb/musb/musb_dsps.c57
-rw-r--r--drivers/usb/musb/musb_host.c7
-rw-r--r--drivers/usb/musb/musb_host.h2
-rw-r--r--drivers/usb/musb/musb_virthub.c2
-rw-r--r--include/linux/usb/musb.h3
5 files changed, 69 insertions, 2 deletions
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 3f3724471667..7cfa6e80ad60 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -113,6 +113,19 @@ struct dsps_musb_wrapper {
u8 poll_seconds;
};
+/*
+ * register shadow for suspend
+ */
+struct dsps_context {
+ u32 control;
+ u32 epintr;
+ u32 coreintr;
+ u32 phy_utmi;
+ u32 mode;
+ u32 tx_mode;
+ u32 rx_mode;
+};
+
/**
* DSPS glue structure.
*/
@@ -122,6 +135,8 @@ struct dsps_glue {
const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */
struct timer_list timer; /* otg_workaround timer */
unsigned long last_timer; /* last timer data for each instance */
+
+ struct dsps_context context;
};
static void dsps_musb_try_idle(struct musb *musb, unsigned long timeout)
@@ -559,6 +574,7 @@ static int dsps_create_musb_pdev(struct dsps_glue *glue,
config->num_eps = get_int_prop(dn, "mentor,num-eps");
config->ram_bits = get_int_prop(dn, "mentor,ram-bits");
+ config->host_port_deassert_reset_at_resume = 1;
pdata.mode = get_musb_port_mode(dev);
/* DT keeps this entry in mA, musb expects it as per USB spec */
pdata.power = get_int_prop(dn, "mentor,power") / 2;
@@ -683,11 +699,52 @@ static const struct of_device_id musb_dsps_of_match[] = {
};
MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
+#ifdef CONFIG_PM
+static int dsps_suspend(struct device *dev)
+{
+ struct dsps_glue *glue = dev_get_drvdata(dev);
+ const struct dsps_musb_wrapper *wrp = glue->wrp;
+ struct musb *musb = platform_get_drvdata(glue->musb);
+ void __iomem *mbase = musb->ctrl_base;
+
+ glue->context.control = dsps_readl(mbase, wrp->control);
+ glue->context.epintr = dsps_readl(mbase, wrp->epintr_set);
+ glue->context.coreintr = dsps_readl(mbase, wrp->coreintr_set);
+ glue->context.phy_utmi = dsps_readl(mbase, wrp->phy_utmi);
+ glue->context.mode = dsps_readl(mbase, wrp->mode);
+ glue->context.tx_mode = dsps_readl(mbase, wrp->tx_mode);
+ glue->context.rx_mode = dsps_readl(mbase, wrp->rx_mode);
+
+ return 0;
+}
+
+static int dsps_resume(struct device *dev)
+{
+ struct dsps_glue *glue = dev_get_drvdata(dev);
+ const struct dsps_musb_wrapper *wrp = glue->wrp;
+ struct musb *musb = platform_get_drvdata(glue->musb);
+ void __iomem *mbase = musb->ctrl_base;
+
+ dsps_writel(mbase, wrp->control, glue->context.control);
+ dsps_writel(mbase, wrp->epintr_set, glue->context.epintr);
+ dsps_writel(mbase, wrp->coreintr_set, glue->context.coreintr);
+ dsps_writel(mbase, wrp->phy_utmi, glue->context.phy_utmi);
+ dsps_writel(mbase, wrp->mode, glue->context.mode);
+ dsps_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
+ dsps_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(dsps_pm_ops, dsps_suspend, dsps_resume);
+
static struct platform_driver dsps_usbss_driver = {
.probe = dsps_probe,
.remove = dsps_remove,
.driver = {
.name = "musb-dsps",
+ .pm = &dsps_pm_ops,
.of_match_table = musb_dsps_of_match,
},
};
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 81caf9f4eb1a..822413899260 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -2464,7 +2464,12 @@ static int musb_bus_suspend(struct usb_hcd *hcd)
static int musb_bus_resume(struct usb_hcd *hcd)
{
- /* resuming child port does the work */
+ struct musb *musb = hcd_to_musb(hcd);
+
+ if (musb->config &&
+ musb->config->host_port_deassert_reset_at_resume)
+ musb_port_reset(musb, false);
+
return 0;
}
diff --git a/drivers/usb/musb/musb_host.h b/drivers/usb/musb/musb_host.h
index e660af90272d..7436c24af0ff 100644
--- a/drivers/usb/musb/musb_host.h
+++ b/drivers/usb/musb/musb_host.h
@@ -93,6 +93,7 @@ extern void musb_root_disconnect(struct musb *musb);
extern void musb_host_resume_root_hub(struct musb *musb);
extern void musb_host_poke_root_hub(struct musb *musb);
extern void musb_port_suspend(struct musb *musb, bool do_suspend);
+extern void musb_port_reset(struct musb *musb, bool do_reset);
#else
static inline struct musb *hcd_to_musb(struct usb_hcd *hcd)
{
@@ -123,6 +124,7 @@ static inline void musb_host_resume_root_hub(struct musb *musb) {}
static inline void musb_host_poll_rh_status(struct musb *musb) {}
static inline void musb_host_poke_root_hub(struct musb *musb) {}
static inline void musb_port_suspend(struct musb *musb, bool do_suspend) {}
+static inline void musb_port_reset(struct musb *musb) {}
#endif
struct usb_hcd;
diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c
index e977441401ed..24e46c0c84b5 100644
--- a/drivers/usb/musb/musb_virthub.c
+++ b/drivers/usb/musb/musb_virthub.c
@@ -109,7 +109,7 @@ void musb_port_suspend(struct musb *musb, bool do_suspend)
}
}
-static void musb_port_reset(struct musb *musb, bool do_reset)
+void musb_port_reset(struct musb *musb, bool do_reset)
{
u8 power;
void __iomem *mbase = musb->mregs;
diff --git a/include/linux/usb/musb.h b/include/linux/usb/musb.h
index eb505250940a..a4ee1b582183 100644
--- a/include/linux/usb/musb.h
+++ b/include/linux/usb/musb.h
@@ -76,6 +76,9 @@ struct musb_hdrc_config {
unsigned dma:1 __deprecated; /* supports DMA */
unsigned vendor_req:1 __deprecated; /* vendor registers required */
+ /* need to explicitly de-assert the port reset after resume? */
+ unsigned host_port_deassert_reset_at_resume:1;
+
u8 num_eps; /* number of endpoints _with_ ep0 */
u8 dma_channels __deprecated; /* number of dma channels */
u8 dyn_fifo_size; /* dynamic size in bytes */