From patchwork Thu Jul 21 13:52:59 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shubhrajyoti Datta X-Patchwork-Id: 994932 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.4) with ESMTP id p6LDrPf0028180 for ; Thu, 21 Jul 2011 13:53:25 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751297Ab1GUNxY (ORCPT ); Thu, 21 Jul 2011 09:53:24 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:52359 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751283Ab1GUNxX (ORCPT ); Thu, 21 Jul 2011 09:53:23 -0400 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id p6LDrEsh026921 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 21 Jul 2011 08:53:17 -0500 Received: from dbde71.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id p6LDrElj020741; Thu, 21 Jul 2011 19:23:14 +0530 (IST) Received: from dbdp31.itg.ti.com (172.24.170.98) by DBDE71.ent.ti.com (172.24.170.149) with Microsoft SMTP Server id 8.3.106.1; Thu, 21 Jul 2011 19:23:14 +0530 Received: from a0393217ubnlt.india.ti.com ([172.24.190.93]) by dbdp31.itg.ti.com (8.13.8/8.13.8) with ESMTP id p6LDr2NK003719; Thu, 21 Jul 2011 19:23:09 +0530 (IST) From: Shubhrajyoti D To: CC: linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, khilman@ti.com, rnayak@ti.com, balajitk@ti.com, santosh.shilimkar@ti.com, Shubhrajyoti D Subject: [PATCHV3 2/4] OMAP: I2C: Remove the reset in the init path Date: Thu, 21 Jul 2011 19:22:59 +0530 Message-ID: <1311256381-25548-3-git-send-email-shubhrajyoti@ti.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1311256381-25548-1-git-send-email-shubhrajyoti@ti.com> References: <1311256381-25548-1-git-send-email-shubhrajyoti@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Thu, 21 Jul 2011 13:53:26 +0000 (UTC) The reset in the driver at init is not needed anymore as the hwmod framework takes care of reseting it. Signed-off-by: Shubhrajyoti D --- drivers/i2c/busses/i2c-omap.c | 73 ++++++++++++---------------------------- 1 files changed, 22 insertions(+), 51 deletions(-) diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 8f87a37..8dc54d5 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -155,9 +155,6 @@ enum { #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */ #endif -/* OCP_SYSSTATUS bit definitions */ -#define SYSS_RESETDONE_MASK (1 << 0) - /* OCP_SYSCONFIG bit definitions */ #define SYSC_CLOCKACTIVITY_MASK (0x3 << 8) #define SYSC_SIDLEMODE_MASK (0x3 << 3) @@ -182,6 +179,7 @@ struct omap_i2c_dev { u32 latency; /* maximum mpu wkup latency */ void (*set_mpu_wkup_lat)(struct device *dev, long latency); + int (*device_reset)(struct device *dev); u32 speed; /* Speed of bus in Khz */ u16 cmd_err; u8 *buf; @@ -332,7 +330,6 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) u16 psc = 0, scll = 0, sclh = 0, buf = 0; u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0; unsigned long fclk_rate = 12000000; - unsigned long timeout; unsigned long internal_clk = 0; struct clk *fclk; struct platform_device *pdev; @@ -341,53 +338,16 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) pdev = to_platform_device(dev->dev); pdata = pdev->dev.platform_data; - if (dev->rev >= OMAP_I2C_OMAP1_REV_2) { - /* Disable I2C controller before soft reset */ - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, - omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) & - ~(OMAP_I2C_CON_EN)); - - omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK); - /* For some reason we need to set the EN bit before the - * reset done bit gets set. */ - timeout = jiffies + OMAP_I2C_TIMEOUT; - omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); - while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) & - SYSS_RESETDONE_MASK)) { - if (time_after(jiffies, timeout)) { - dev_warn(dev->dev, "timeout waiting " - "for controller reset\n"); - return -ETIMEDOUT; - } - msleep(1); - } - - /* SYSC register is cleared by the reset; rewrite it */ - if (dev->rev == OMAP_I2C_REV_ON_2430) { - - omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, - SYSC_AUTOIDLE_MASK); - - } else if (dev->rev >= OMAP_I2C_REV_ON_3430) { - dev->syscstate = SYSC_AUTOIDLE_MASK; - dev->syscstate |= SYSC_ENAWAKEUP_MASK; - dev->syscstate |= (SYSC_IDLEMODE_SMART << - __ffs(SYSC_SIDLEMODE_MASK)); - dev->syscstate |= (SYSC_CLOCKACTIVITY_FCLK << - __ffs(SYSC_CLOCKACTIVITY_MASK)); - - omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, - dev->syscstate); - /* - * Enabling all wakup sources to stop I2C freezing on - * WFI instruction. - * REVISIT: Some wkup sources might not be needed. - */ - dev->westate = OMAP_I2C_WE_ALL; - if (dev->rev < OMAP_I2C_REV_ON_3530_4430) - omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, - dev->westate); - } + if (dev->rev >= OMAP_I2C_REV_ON_3430) { + /* + * Enabling all wakup sources to stop I2C freezing on + * WFI instruction. + * REVISIT: Some wkup sources might not be needed. + */ + dev->westate = OMAP_I2C_WE_ALL; + if (dev->rev < OMAP_I2C_REV_ON_3530_4430) + omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, + dev->westate); } omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); @@ -612,6 +572,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap, return r; if (r == 0) { dev_err(dev->dev, "controller timed out\n"); + if (dev->device_reset != NULL) { + r = dev->device_reset(dev->dev); + if (r < 0) + dev_err(dev->dev, "reset failed\n"); + } omap_i2c_init(dev); return -ETIMEDOUT; } @@ -622,6 +587,11 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap, /* We have an error */ if (dev->cmd_err & (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR | OMAP_I2C_STAT_XUDF)) { + if (dev->device_reset != NULL) { + r = dev->device_reset(dev->dev); + if (r < 0) + dev_err(dev->dev, "reset failed\n"); + } omap_i2c_init(dev); return -EIO; } @@ -1024,6 +994,7 @@ omap_i2c_probe(struct platform_device *pdev) if (pdata != NULL) { speed = pdata->clkrate; dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat; + dev->device_reset = pdata->device_reset; } else { speed = 100; /* Default speed */ dev->set_mpu_wkup_lat = NULL;