From b2aeb6da3d6ee562e57ad3a7d73a7de0c36ce8eb Mon Sep 17 00:00:00 2001 From: Pawel Laszczak Date: Mon, 13 Jul 2020 12:05:54 +0200 Subject: usb: cdns3: drd: simplify *switch_gadet and *switch_host Patch split function cdns3_drd_switch_gadget and cdns3_drd_switch_host into: - cdns3_drd_host_on - cdns3_drd_host_off - cdns3_drd_gadget_on - cdns3_drd_gadgett_off These functions don't have any shared code so it's better to have smaller, faster and easier functions. Signed-off-by: Pawel Laszczak Reviewed-by: Peter Chen Signed-off-by: Felipe Balbi --- drivers/usb/cdns3/drd.c | 124 ++++++++++++++++++++++++++---------------------- 1 file changed, 68 insertions(+), 56 deletions(-) (limited to 'drivers/usb/cdns3/drd.c') diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c index 8e7673da905e..6234bcd6158a 100644 --- a/drivers/usb/cdns3/drd.c +++ b/drivers/usb/cdns3/drd.c @@ -124,85 +124,97 @@ static void cdns3_otg_enable_irq(struct cdns3 *cdns) } /** - * cdns3_drd_switch_host - start/stop host - * @cdns: Pointer to controller context structure - * @on: 1 for start, 0 for stop + * cdns3_drd_host_on - start host. + * @cdns: Pointer to controller context structure. * - * Returns 0 on success otherwise negative errno + * Returns 0 on success otherwise negative errno. */ -int cdns3_drd_switch_host(struct cdns3 *cdns, int on) +int cdns3_drd_host_on(struct cdns3 *cdns) { - int ret, val; + u32 val; + int ret; - /* switch OTG core */ - if (on) { - writel(OTGCMD_HOST_BUS_REQ | OTGCMD_OTG_DIS, - &cdns->otg_regs->cmd); - - dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n"); - ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val, - val & OTGSTS_XHCI_READY, - 1, 100000); - if (ret) { - dev_err(cdns->dev, "timeout waiting for xhci_ready\n"); - return ret; - } - } else { - writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP | - OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF, - &cdns->otg_regs->cmd); - /* Waiting till H_IDLE state.*/ - readl_poll_timeout_atomic(&cdns->otg_regs->state, val, - !(val & OTGSTATE_HOST_STATE_MASK), - 1, 2000000); - } + /* Enable host mode. */ + writel(OTGCMD_HOST_BUS_REQ | OTGCMD_OTG_DIS, + &cdns->otg_regs->cmd); - return 0; + dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n"); + ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val, + val & OTGSTS_XHCI_READY, 1, 100000); + + if (ret) + dev_err(cdns->dev, "timeout waiting for xhci_ready\n"); + + return ret; } /** - * cdns3_drd_switch_gadget - start/stop gadget - * @cdns: Pointer to controller context structure - * @on: 1 for start, 0 for stop + * cdns3_drd_host_off - stop host. + * @cdns: Pointer to controller context structure. + */ +void cdns3_drd_host_off(struct cdns3 *cdns) +{ + u32 val; + + writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP | + OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF, + &cdns->otg_regs->cmd); + + /* Waiting till H_IDLE state.*/ + readl_poll_timeout_atomic(&cdns->otg_regs->state, val, + !(val & OTGSTATE_HOST_STATE_MASK), + 1, 2000000); +} + +/** + * cdns3_drd_gadget_on - start gadget. + * @cdns: Pointer to controller context structure. * * Returns 0 on success otherwise negative errno */ -int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on) +int cdns3_drd_gadget_on(struct cdns3 *cdns) { int ret, val; u32 reg = OTGCMD_OTG_DIS; /* switch OTG core */ - if (on) { - writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd); + writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd); - dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n"); + dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n"); - ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val, - val & OTGSTS_DEV_READY, - 1, 100000); - if (ret) { - dev_err(cdns->dev, "timeout waiting for dev_ready\n"); - return ret; - } - } else { - /* - * driver should wait at least 10us after disabling Device - * before turning-off Device (DEV_BUS_DROP) - */ - usleep_range(20, 30); - writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP | - OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF, - &cdns->otg_regs->cmd); - /* Waiting till DEV_IDLE state.*/ - readl_poll_timeout_atomic(&cdns->otg_regs->state, val, - !(val & OTGSTATE_DEV_STATE_MASK), - 1, 2000000); + ret = readl_poll_timeout_atomic(&cdns->otg_regs->sts, val, + val & OTGSTS_DEV_READY, + 1, 100000); + if (ret) { + dev_err(cdns->dev, "timeout waiting for dev_ready\n"); + return ret; } return 0; } +/** + * cdns3_drd_gadget_off - stop gadget. + * @cdns: Pointer to controller context structure. + */ +void cdns3_drd_gadget_off(struct cdns3 *cdns) +{ + u32 val; + + /* + * Driver should wait at least 10us after disabling Device + * before turning-off Device (DEV_BUS_DROP). + */ + usleep_range(20, 30); + writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP | + OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF, + &cdns->otg_regs->cmd); + /* Waiting till DEV_IDLE state.*/ + readl_poll_timeout_atomic(&cdns->otg_regs->state, val, + !(val & OTGSTATE_DEV_STATE_MASK), + 1, 2000000); +} + /** * cdns3_init_otg_mode - initialize drd controller * @cdns: Pointer to controller context structure -- cgit v1.2.3