diff options
Diffstat (limited to 'drivers/usb/musb')
-rw-r--r-- | drivers/usb/musb/musb_core.c | 103 | ||||
-rw-r--r-- | drivers/usb/musb/musb_core.h | 3 | ||||
-rw-r--r-- | drivers/usb/musb/omap2430.c | 71 |
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)); } |