From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753363Ab3B1Kjc (ORCPT ); Thu, 28 Feb 2013 05:39:32 -0500 Received: from mail-we0-f180.google.com ([74.125.82.180]:56639 "EHLO mail-we0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752627Ab3B1Kj2 (ORCPT ); Thu, 28 Feb 2013 05:39:28 -0500 From: Fabio Baltieri To: Felipe Balbi Cc: Linus Walleij , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Fabio Baltieri Subject: [PATCH 2/5] usb: musb: ux500: implement musb_set_vbus Date: Thu, 28 Feb 2013 11:38:51 +0100 Message-Id: <1362047934-22337-3-git-send-email-fabio.baltieri@linaro.org> X-Mailer: git-send-email 1.8.1.3 In-Reply-To: <1362047934-22337-1-git-send-email-fabio.baltieri@linaro.org> References: <1362047934-22337-1-git-send-email-fabio.baltieri@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add ux500_musb_set_vbus() implementation for ux500. This is based on the version originally developed inside ST-Ericsson. Acked-by: Linus Walleij Signed-off-by: Fabio Baltieri --- drivers/usb/musb/ux500.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/drivers/usb/musb/ux500.c b/drivers/usb/musb/ux500.c index 13a3929..5b742ba 100644 --- a/drivers/usb/musb/ux500.c +++ b/drivers/usb/musb/ux500.c @@ -36,6 +36,68 @@ struct ux500_glue { }; #define glue_to_musb(g) platform_get_drvdata(g->musb) +static void ux500_musb_set_vbus(struct musb *musb, int is_on) +{ + 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); + + if (is_on) { + if (musb->xceiv->state == OTG_STATE_A_IDLE) { + /* 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) & 0x80) { + + if (time_after(jiffies, timeout)) { + dev_err(musb->controller, + "configured as A device timeout"); + break; + } + } + + } else { + musb->is_active = 1; + musb->xceiv->otg->default_a = 1; + musb->xceiv->state = OTG_STATE_A_WAIT_VRISE; + devctl |= MUSB_DEVCTL_SESSION; + MUSB_HST_MODE(musb); + } + } else { + musb->is_active = 0; + + /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping + * right to B_IDLE... + */ + musb->xceiv->otg->default_a = 0; + devctl &= ~MUSB_DEVCTL_SESSION; + MUSB_DEV_MODE(musb); + } + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + + /* + * Devctl values will be updated after vbus goes below + * session_valid. The time taken depends on the capacitance + * on VBUS line. The max discharge time can be upto 1 sec + * as per the spec. Typically on our platform, it is 200ms + */ + if (!is_on) + mdelay(200); + + dev_dbg(musb->controller, "VBUS %s, devctl %02x\n", + otg_state_string(musb->xceiv->state), + musb_readb(musb->mregs, MUSB_DEVCTL)); +} + static irqreturn_t ux500_musb_interrupt(int irq, void *__hci) { unsigned long flags; @@ -79,6 +141,8 @@ static int ux500_musb_exit(struct musb *musb) static const struct musb_platform_ops ux500_ops = { .init = ux500_musb_init, .exit = ux500_musb_exit, + + .set_vbus = ux500_musb_set_vbus, }; static int ux500_probe(struct platform_device *pdev) -- 1.8.1.3