summaryrefslogtreecommitdiffstats
path: root/drivers/usb/musb
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/musb')
-rw-r--r--drivers/usb/musb/musb_core.c103
-rw-r--r--drivers/usb/musb/musb_core.h3
-rw-r--r--drivers/usb/musb/omap2430.c71
3 files changed, 128 insertions, 49 deletions
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 48d95850152d..34090707d122 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -73,6 +73,7 @@
#include <linux/prefetch.h>
#include <linux/platform_device.h>
#include <linux/io.h>
+#include <linux/iopoll.h>
#include <linux/dma-mapping.h>
#include <linux/usb.h>
#include <linux/usb/of.h>
@@ -414,6 +415,108 @@ void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
return hw_ep->musb->io.write_fifo(hw_ep, len, src);
}
+static u8 musb_read_devctl(struct musb *musb)
+{
+ return musb_readb(musb->mregs, MUSB_DEVCTL);
+}
+
+/**
+ * musb_set_host - set and initialize host mode
+ * @musb: musb controller driver data
+ *
+ * At least some musb revisions need to enable devctl session bit in
+ * peripheral mode to switch to host mode. Initializes things to host
+ * mode and sets A_IDLE. SoC glue needs to advance state further
+ * based on phy provided VBUS state.
+ *
+ * Note that the SoC glue code may need to wait for musb to settle
+ * on enable before calling this to avoid babble.
+ */
+int musb_set_host(struct musb *musb)
+{
+ int error = 0;
+ u8 devctl;
+
+ if (!musb)
+ return -EINVAL;
+
+ devctl = musb_read_devctl(musb);
+ if (!(devctl & MUSB_DEVCTL_BDEVICE)) {
+ dev_info(musb->controller,
+ "%s: already in host mode: %02x\n",
+ __func__, devctl);
+ goto init_data;
+ }
+
+ devctl |= MUSB_DEVCTL_SESSION;
+ musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+
+ error = readx_poll_timeout(musb_read_devctl, musb, devctl,
+ !(devctl & MUSB_DEVCTL_BDEVICE), 5000,
+ 1000000);
+ if (error) {
+ dev_err(musb->controller, "%s: could not set host: %02x\n",
+ __func__, devctl);
+
+ return error;
+ }
+
+init_data:
+ musb->is_active = 1;
+ musb->xceiv->otg->state = OTG_STATE_A_IDLE;
+ MUSB_HST_MODE(musb);
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(musb_set_host);
+
+/**
+ * musb_set_peripheral - set and initialize peripheral mode
+ * @musb: musb controller driver data
+ *
+ * Clears devctl session bit and initializes things for peripheral
+ * mode and sets B_IDLE. SoC glue needs to advance state further
+ * based on phy provided VBUS state.
+ */
+int musb_set_peripheral(struct musb *musb)
+{
+ int error = 0;
+ u8 devctl;
+
+ if (!musb)
+ return -EINVAL;
+
+ devctl = musb_read_devctl(musb);
+ if (devctl & MUSB_DEVCTL_BDEVICE) {
+ dev_info(musb->controller,
+ "%s: already in peripheral mode: %02x\n",
+ __func__, devctl);
+
+ goto init_data;
+ }
+
+ devctl &= ~MUSB_DEVCTL_SESSION;
+ musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+
+ error = readx_poll_timeout(musb_read_devctl, musb, devctl,
+ devctl & MUSB_DEVCTL_BDEVICE, 5000,
+ 1000000);
+ if (error) {
+ dev_err(musb->controller, "%s: could not set periperal: %02x\n",
+ __func__, devctl);
+
+ return error;
+ }
+
+init_data:
+ musb->is_active = 0;
+ musb->xceiv->otg->state = OTG_STATE_B_IDLE;
+ MUSB_DEV_MODE(musb);
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(musb_set_peripheral);
+
/*-------------------------------------------------------------------------*/
/* for high speed test mode; see USB 2.0 spec 7.1.20 */
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index 04203b7126d5..8a13a46cd891 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -487,6 +487,9 @@ extern void musb_start(struct musb *musb);
extern void musb_write_fifo(struct musb_hw_ep *ep, u16 len, const u8 *src);
extern void musb_read_fifo(struct musb_hw_ep *ep, u16 len, u8 *dst);
+extern int musb_set_host(struct musb *musb);
+extern int musb_set_peripheral(struct musb *musb);
+
extern void musb_load_testpacket(struct musb *);
extern irqreturn_t musb_interrupt(struct musb *);
diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index e572ee624128..9c1b72a4b12f 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -38,65 +38,38 @@ struct omap2430_glue {
static struct omap2430_glue *_glue;
+/*
+ * HDRC controls CPEN, but beware current surges during device connect.
+ * They can trigger transient overcurrent conditions that must be ignored.
+ *
+ * Note that we're skipping A_WAIT_VFALL -> A_IDLE and jumping right to B_IDLE
+ * as set by musb_set_peripheral().
+ */
static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
{
- struct usb_otg *otg = musb->xceiv->otg;
- u8 devctl;
- unsigned long timeout = jiffies + msecs_to_jiffies(1000);
- /* HDRC controls CPEN, but beware current surges during device
- * connect. They can trigger transient overcurrent conditions
- * that must be ignored.
- */
-
- devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
+ struct usb_otg *otg = musb->xceiv->otg;
+ int error;
if (is_on) {
- if (musb->xceiv->otg->state == OTG_STATE_A_IDLE) {
- int loops = 100;
- /* start the session */
- devctl |= MUSB_DEVCTL_SESSION;
- musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
- /*
- * Wait for the musb to set as A device to enable the
- * VBUS
- */
- while (musb_readb(musb->mregs, MUSB_DEVCTL) &
- MUSB_DEVCTL_BDEVICE) {
-
- mdelay(5);
- cpu_relax();
-
- if (time_after(jiffies, timeout)
- || loops-- <= 0) {
- dev_err(musb->controller,
- "configured as A device timeout");
- break;
- }
+ switch (musb->xceiv->otg->state) {
+ case OTG_STATE_A_IDLE:
+ error = musb_set_host(musb);
+ if (!error) {
+ musb->xceiv->otg->state =
+ OTG_STATE_A_WAIT_VRISE;
+ otg_set_vbus(otg, 1);
}
-
+ break;
+ default:
otg_set_vbus(otg, 1);
- } else {
- musb->is_active = 1;
- musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
- devctl |= MUSB_DEVCTL_SESSION;
- MUSB_HST_MODE(musb);
+ break;
}
} else {
- musb->is_active = 0;
-
- /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and
- * jumping right to B_IDLE...
- */
-
- musb->xceiv->otg->state = OTG_STATE_B_IDLE;
- devctl &= ~MUSB_DEVCTL_SESSION;
-
- MUSB_DEV_MODE(musb);
+ error = musb_set_peripheral(musb);
+ otg_set_vbus(otg, 0);
}
- musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
- dev_dbg(musb->controller, "VBUS %s, devctl %02x "
- /* otg %3x conf %08x prcm %08x */ "\n",
+ dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
usb_otg_state_string(musb->xceiv->otg->state),
musb_readb(musb->mregs, MUSB_DEVCTL));
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-07 11:21:45 +0000