diff options
Diffstat (limited to 'drivers/usb/musb/musb_core.c')
-rw-r--r-- | drivers/usb/musb/musb_core.c | 221 |
1 files changed, 111 insertions, 110 deletions
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 067920f..3789b08 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -99,6 +99,7 @@ #include <linux/platform_device.h> #include <linux/io.h> #include <linux/dma-mapping.h> +#include <linux/usb.h> #include "musb_core.h" @@ -507,7 +508,8 @@ void musb_hnp_stop(struct musb *musb) musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16); } -static void musb_generic_disable(struct musb *musb); +static void musb_recover_from_babble(struct musb *musb); + /* * Interrupt Service Routine to record USB "global" interrupts. * Since these do not happen often and signify things of @@ -534,35 +536,21 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb, */ if (int_usb & MUSB_INTR_RESUME) { handled = IRQ_HANDLED; - dev_dbg(musb->controller, "RESUME (%s)\n", usb_otg_state_string(musb->xceiv->otg->state)); + dev_dbg(musb->controller, "RESUME (%s)\n", + usb_otg_state_string(musb->xceiv->otg->state)); if (devctl & MUSB_DEVCTL_HM) { - void __iomem *mbase = musb->mregs; - u8 power; - switch (musb->xceiv->otg->state) { case OTG_STATE_A_SUSPEND: /* remote wakeup? later, GetPortStatus * will stop RESUME signaling */ - power = musb_readb(musb->mregs, MUSB_POWER); - if (power & MUSB_POWER_SUSPENDM) { - /* spurious */ - musb->int_usb &= ~MUSB_INTR_SUSPEND; - dev_dbg(musb->controller, "Spurious SUSPENDM\n"); - break; - } - - power &= ~MUSB_POWER_SUSPENDM; - musb_writeb(mbase, MUSB_POWER, - power | MUSB_POWER_RESUME); - musb->port1_status |= (USB_PORT_STAT_C_SUSPEND << 16) | MUSB_PORT_STAT_RESUME; musb->rh_timer = jiffies - + msecs_to_jiffies(20); + + msecs_to_jiffies(USB_RESUME_TIMEOUT); musb->need_finish_resume = 1; musb->xceiv->otg->state = OTG_STATE_A_HOST; @@ -775,10 +763,6 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb, musb->ep0_stage = MUSB_EP0_START; - /* flush endpoints when transitioning from Device Mode */ - if (is_peripheral_active(musb)) { - /* REVISIT HNP; just force disconnect */ - } musb->intrtxe = musb->epmask; musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe); musb->intrrxe = musb->epmask & 0xfffe; @@ -879,20 +863,19 @@ b_host: */ if (int_usb & MUSB_INTR_RESET) { handled = IRQ_HANDLED; - if ((devctl & MUSB_DEVCTL_HM) != 0) { + if (devctl & MUSB_DEVCTL_HM) { /* - * Looks like non-HS BABBLE can be ignored, but - * HS BABBLE is an error condition. For HS the solution - * is to avoid babble in the first place and fix what - * caused BABBLE. When HS BABBLE happens we can only - * stop the session. + * When BABBLE happens what we can depends on which + * platform MUSB is running, because some platforms + * implemented proprietary means for 'recovering' from + * Babble conditions. One such platform is AM335x. In + * most cases, however, the only thing we can do is + * drop the session. */ - if (devctl & (MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV)) - dev_dbg(musb->controller, "BABBLE devctl: %02x\n", devctl); - else { - ERR("Stopping host session -- babble\n"); - musb_writeb(musb->mregs, MUSB_DEVCTL, 0); - } + dev_err(musb->controller, "Babble\n"); + + if (is_host_active(musb)) + musb_recover_from_babble(musb); } else { dev_dbg(musb->controller, "BUS RESET as %s\n", usb_otg_state_string(musb->xceiv->otg->state)); @@ -931,13 +914,6 @@ b_host: } } - /* handle babble condition */ - if (int_usb & MUSB_INTR_BABBLE && is_host_active(musb)) { - musb_generic_disable(musb); - schedule_delayed_work(&musb->recover_work, - msecs_to_jiffies(100)); - } - #if 0 /* REVISIT ... this would be for multiplexing periodic endpoints, or * supporting transfer phasing to prevent exceeding ISO bandwidth @@ -990,7 +966,7 @@ b_host: /*-------------------------------------------------------------------------*/ -static void musb_generic_disable(struct musb *musb) +static void musb_disable_interrupts(struct musb *musb) { void __iomem *mbase = musb->mregs; u16 temp; @@ -1002,14 +978,33 @@ static void musb_generic_disable(struct musb *musb) musb->intrrxe = 0; musb_writew(mbase, MUSB_INTRRXE, 0); - /* off */ - musb_writeb(mbase, MUSB_DEVCTL, 0); - /* flush pending interrupts */ temp = musb_readb(mbase, MUSB_INTRUSB); temp = musb_readw(mbase, MUSB_INTRTX); temp = musb_readw(mbase, MUSB_INTRRX); +} + +static void musb_enable_interrupts(struct musb *musb) +{ + void __iomem *regs = musb->mregs; + + /* Set INT enable registers, enable interrupts */ + musb->intrtxe = musb->epmask; + musb_writew(regs, MUSB_INTRTXE, musb->intrtxe); + musb->intrrxe = musb->epmask & 0xfffe; + musb_writew(regs, MUSB_INTRRXE, musb->intrrxe); + musb_writeb(regs, MUSB_INTRUSBE, 0xf7); + +} + +static void musb_generic_disable(struct musb *musb) +{ + void __iomem *mbase = musb->mregs; + musb_disable_interrupts(musb); + + /* off */ + musb_writeb(mbase, MUSB_DEVCTL, 0); } /* @@ -1022,13 +1017,7 @@ void musb_start(struct musb *musb) dev_dbg(musb->controller, "<== devctl %02x\n", devctl); - /* Set INT enable registers, enable interrupts */ - musb->intrtxe = musb->epmask; - musb_writew(regs, MUSB_INTRTXE, musb->intrtxe); - musb->intrrxe = musb->epmask & 0xfffe; - musb_writew(regs, MUSB_INTRRXE, musb->intrrxe); - musb_writeb(regs, MUSB_INTRUSBE, 0xf7); - + musb_enable_interrupts(musb); musb_writeb(regs, MUSB_TESTMODE, 0); /* put into basic highspeed mode and start session */ @@ -1587,9 +1576,12 @@ static int musb_core_init(u16 musb_type, struct musb *musb) irqreturn_t musb_interrupt(struct musb *musb) { irqreturn_t retval = IRQ_NONE; + unsigned long status; + unsigned long epnum; u8 devctl; - int ep_num; - u32 reg; + + if (!musb->int_usb && !musb->int_tx && !musb->int_rx) + return IRQ_NONE; devctl = musb_readb(musb->mregs, MUSB_DEVCTL); @@ -1597,56 +1589,57 @@ irqreturn_t musb_interrupt(struct musb *musb) is_host_active(musb) ? "host" : "peripheral", musb->int_usb, musb->int_tx, musb->int_rx); - /* the core can interrupt us for multiple reasons; docs have - * a generic interrupt flowchart to follow + /** + * According to Mentor Graphics' documentation, flowchart on page 98, + * IRQ should be handled as follows: + * + * . Resume IRQ + * . Session Request IRQ + * . VBUS Error IRQ + * . Suspend IRQ + * . Connect IRQ + * . Disconnect IRQ + * . Reset/Babble IRQ + * . SOF IRQ (we're not using this one) + * . Endpoint 0 IRQ + * . TX Endpoints + * . RX Endpoints + * + * We will be following that flowchart in order to avoid any problems + * that might arise with internal Finite State Machine. */ - if (musb->int_usb) - retval |= musb_stage0_irq(musb, musb->int_usb, - devctl); - /* "stage 1" is handling endpoint irqs */ + if (musb->int_usb) + retval |= musb_stage0_irq(musb, musb->int_usb, devctl); - /* handle endpoint 0 first */ if (musb->int_tx & 1) { if (is_host_active(musb)) retval |= musb_h_ep0_irq(musb); else retval |= musb_g_ep0_irq(musb); + + /* we have just handled endpoint 0 IRQ, clear it */ + musb->int_tx &= ~BIT(0); } - /* RX on endpoints 1-15 */ - reg = musb->int_rx >> 1; - ep_num = 1; - while (reg) { - if (reg & 1) { - /* musb_ep_select(musb->mregs, ep_num); */ - /* REVISIT just retval = ep->rx_irq(...) */ - retval = IRQ_HANDLED; - if (is_host_active(musb)) - musb_host_rx(musb, ep_num); - else - musb_g_rx(musb, ep_num); - } + status = musb->int_tx; - reg >>= 1; - ep_num++; + for_each_set_bit(epnum, &status, 16) { + retval = IRQ_HANDLED; + if (is_host_active(musb)) + musb_host_tx(musb, epnum); + else + musb_g_tx(musb, epnum); } - /* TX on endpoints 1-15 */ - reg = musb->int_tx >> 1; - ep_num = 1; - while (reg) { - if (reg & 1) { - /* musb_ep_select(musb->mregs, ep_num); */ - /* REVISIT just retval |= ep->tx_irq(...) */ - retval = IRQ_HANDLED; - if (is_host_active(musb)) - musb_host_tx(musb, ep_num); - else - musb_g_tx(musb, ep_num); - } - reg >>= 1; - ep_num++; + status = musb->int_rx; + + for_each_set_bit(epnum, &status, 16) { + retval = IRQ_HANDLED; + if (is_host_active(musb)) + musb_host_rx(musb, epnum); + else + musb_g_rx(musb, epnum); } return retval; @@ -1825,33 +1818,44 @@ static void musb_irq_work(struct work_struct *data) } } -/* Recover from babble interrupt conditions */ -static void musb_recover_work(struct work_struct *data) +static void musb_recover_from_babble(struct musb *musb) { - struct musb *musb = container_of(data, struct musb, recover_work.work); - int status, ret; + int ret; + u8 devctl; - ret = musb_platform_reset(musb); - if (ret) + musb_disable_interrupts(musb); + + /* + * wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give + * it some slack and wait for 10us. + */ + udelay(10); + + ret = musb_platform_recover(musb); + if (ret) { + musb_enable_interrupts(musb); return; + } - usb_phy_vbus_off(musb->xceiv); - usleep_range(100, 200); + /* drop session bit */ + devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + devctl &= ~MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); - usb_phy_vbus_on(musb->xceiv); - usleep_range(100, 200); + /* tell usbcore about it */ + musb_root_disconnect(musb); /* * When a babble condition occurs, the musb controller * removes the session bit and the endpoint config is lost. */ if (musb->dyn_fifo) - status = ep_config_from_table(musb); + ret = ep_config_from_table(musb); else - status = ep_config_from_hw(musb); + ret = ep_config_from_hw(musb); - /* start the session again */ - if (status == 0) + /* restart session */ + if (ret == 0) musb_start(musb); } @@ -2087,7 +2091,6 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl) /* Init IRQ workqueue before request_irq */ INIT_WORK(&musb->irq_work, musb_irq_work); - INIT_DELAYED_WORK(&musb->recover_work, musb_recover_work); INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset); INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume); @@ -2183,7 +2186,6 @@ fail4: fail3: cancel_work_sync(&musb->irq_work); - cancel_delayed_work_sync(&musb->recover_work); cancel_delayed_work_sync(&musb->finish_resume_work); cancel_delayed_work_sync(&musb->deassert_reset_work); if (musb->dma_controller) @@ -2249,7 +2251,6 @@ static int musb_remove(struct platform_device *pdev) dma_controller_destroy(musb->dma_controller); cancel_work_sync(&musb->irq_work); - cancel_delayed_work_sync(&musb->recover_work); cancel_delayed_work_sync(&musb->finish_resume_work); cancel_delayed_work_sync(&musb->deassert_reset_work); musb_free(musb); @@ -2463,7 +2464,7 @@ static int musb_resume(struct device *dev) if (musb->need_finish_resume) { musb->need_finish_resume = 0; schedule_delayed_work(&musb->finish_resume_work, - msecs_to_jiffies(20)); + msecs_to_jiffies(USB_RESUME_TIMEOUT)); } /* @@ -2506,7 +2507,7 @@ static int musb_runtime_resume(struct device *dev) if (musb->need_finish_resume) { musb->need_finish_resume = 0; schedule_delayed_work(&musb->finish_resume_work, - msecs_to_jiffies(20)); + msecs_to_jiffies(USB_RESUME_TIMEOUT)); } return 0; |