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Thu, 03 Jun 2021 10:06:12 -0700 (PDT) Subject: Re: [PATCH v3] i2c: bcm-iproc: Add i2c recovery support To: Chris Packham , wsa@kernel.org, rjui@broadcom.com, sbranden@broadcom.com, bcm-kernel-feedback-list@broadcom.com Cc: linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Richard Laing References: <20210603052515.11178-1-chris.packham@alliedtelesis.co.nz> From: Ray Jui Message-ID: <758551c7-7fb3-4e10-32a7-7dd48a93b064@broadcom.com> Date: Thu, 3 Jun 2021 10:06:10 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 In-Reply-To: <20210603052515.11178-1-chris.packham@alliedtelesis.co.nz> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210603_100614_376043_811B3A11 X-CRM114-Status: GOOD ( 35.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============2757008827986566631==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============2757008827986566631== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000b201fb05c3df97ed" --000000000000b201fb05c3df97ed Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit On 6/2/2021 10:25 PM, Chris Packham wrote: > From: Richard Laing > > The bcm-iproc controller can put the SDA/SCL lines into bit-bang mode, > make use of this to support i2c bus recovery. > > Signed-off-by: Richard Laing > Signed-off-by: Chris Packham > --- > Richard did most of the work on this. I'm just cleaning it up to get it > upstream. > > Changes in v3: > - drop const from bcm_iproc_recovery_info due to build error from the > kernel test bot > > Changes in v2: > - Incorporate feedback from Ray Jui > - Move bcm_iproc_i2c_resume so it can be re-used to return the i2c bus > to normal operation at the correct speed after a recovery. > - Add iproc_i2c_lockup_recover() helper to only trigger recovery if sda > is actually stuck > - Use usleep_range() instead of udelay() > - Cosmetic changes to register bit definitions > > drivers/i2c/busses/i2c-bcm-iproc.c | 176 +++++++++++++++++++++++++---- > 1 file changed, 151 insertions(+), 25 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c > index cceaf69279a9..fdbb98a848e3 100644 > --- a/drivers/i2c/busses/i2c-bcm-iproc.c > +++ b/drivers/i2c/busses/i2c-bcm-iproc.c > @@ -25,6 +25,7 @@ > #define CFG_OFFSET 0x00 > #define CFG_RESET_SHIFT 31 > #define CFG_EN_SHIFT 30 > +#define CFG_BIT_BANG_SHIFT 29 > #define CFG_SLAVE_ADDR_0_SHIFT 28 > #define CFG_M_RETRY_CNT_SHIFT 16 > #define CFG_M_RETRY_CNT_MASK 0x0f > @@ -66,6 +67,12 @@ > #define S_FIFO_RX_THLD_SHIFT 8 > #define S_FIFO_RX_THLD_MASK 0x3f > > +#define M_BB_CTRL_OFFSET 0x14 > +#define M_BB_SMBCLK_IN_SHIFT 31 > +#define M_BB_SMBCLK_OUT_EN_SHIFT 30 > +#define M_BB_SMBDAT_IN_SHIFT 29 > +#define M_BB_SMBDAT_OUT_EN_SHIFT 28 > + > #define M_CMD_OFFSET 0x30 > #define M_CMD_START_BUSY_SHIFT 31 > #define M_CMD_STATUS_SHIFT 25 > @@ -713,6 +720,147 @@ static void bcm_iproc_i2c_enable_disable(struct bcm_iproc_i2c_dev *iproc_i2c, > iproc_i2c_wr_reg(iproc_i2c, CFG_OFFSET, val); > } > > +static int bcm_iproc_i2c_resume(struct device *dev) > +{ > + struct bcm_iproc_i2c_dev *iproc_i2c = dev_get_drvdata(dev); > + int ret; > + u32 val; > + > + /* > + * Power domain could have been shut off completely in system deep > + * sleep, so re-initialize the block here > + */ > + ret = bcm_iproc_i2c_init(iproc_i2c); > + if (ret) > + return ret; > + > + /* configure to the desired bus speed */ > + val = iproc_i2c_rd_reg(iproc_i2c, TIM_CFG_OFFSET); > + val &= ~BIT(TIM_CFG_MODE_400_SHIFT); > + val |= (iproc_i2c->bus_speed == I2C_MAX_FAST_MODE_FREQ) << TIM_CFG_MODE_400_SHIFT; > + iproc_i2c_wr_reg(iproc_i2c, TIM_CFG_OFFSET, val); > + > + bcm_iproc_i2c_enable_disable(iproc_i2c, true); > + > + return 0; > +} > + > +static void bcm_iproc_i2c_prepare_recovery(struct i2c_adapter *adap) > +{ > + struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adap); > + u32 tmp; > + > + dev_dbg(iproc_i2c->device, "Prepare recovery\n"); > + > + /* Disable interrupts */ > + writel(0, iproc_i2c->base + IE_OFFSET); > + readl(iproc_i2c->base + IE_OFFSET); > + synchronize_irq(iproc_i2c->irq); > + > + /* Place controller in reset */ > + tmp = readl(iproc_i2c->base + CFG_OFFSET); > + tmp |= BIT(CFG_RESET_SHIFT); > + writel(tmp, iproc_i2c->base + CFG_OFFSET); > + usleep_range(100, 200); > + > + /* Switch to bit-bang mode */ > + tmp = readl(iproc_i2c->base + CFG_OFFSET); > + tmp |= BIT(CFG_BIT_BANG_SHIFT); > + writel(tmp, iproc_i2c->base + CFG_OFFSET); > + usleep_range(100, 200); > +} > + > +static void bcm_iproc_i2c_unprepare_recovery(struct i2c_adapter *adap) > +{ > + struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adap); > + u32 tmp; > + > + /* Switch to normal mode */ > + tmp = readl(iproc_i2c->base + CFG_OFFSET); > + tmp &= ~BIT(CFG_BIT_BANG_SHIFT); > + writel(tmp, iproc_i2c->base + CFG_OFFSET); > + usleep_range(100, 200); > + > + bcm_iproc_i2c_resume(iproc_i2c->device); > + > + dev_dbg(iproc_i2c->device, "Recovery complete\n"); > +} > + > +static int bcm_iproc_i2c_get_scl(struct i2c_adapter *adap) > +{ > + struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adap); > + u32 tmp; > + > + tmp = readl(iproc_i2c->base + M_BB_CTRL_OFFSET); > + > + return !!(tmp & BIT(M_BB_SMBCLK_IN_SHIFT)); > +} > + > +static void bcm_iproc_i2c_set_scl(struct i2c_adapter *adap, int val) > +{ > + struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adap); > + u32 tmp; > + > + tmp = readl(iproc_i2c->base + M_BB_CTRL_OFFSET); > + if (val) > + tmp |= BIT(M_BB_SMBCLK_OUT_EN_SHIFT); > + else > + tmp &= ~BIT(M_BB_SMBCLK_OUT_EN_SHIFT); > + > + writel(tmp, iproc_i2c->base + M_BB_CTRL_OFFSET); > +} > + > +static void bcm_iproc_i2c_set_sda(struct i2c_adapter *adap, int val) > +{ > + struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adap); > + u32 tmp; > + > + tmp = readl(iproc_i2c->base + M_BB_CTRL_OFFSET); > + if (val) > + tmp |= BIT(M_BB_SMBDAT_OUT_EN_SHIFT); > + else > + tmp &= ~BIT(M_BB_SMBDAT_OUT_EN_SHIFT); > + > + writel(tmp, iproc_i2c->base + M_BB_CTRL_OFFSET); > +} > + > +static int bcm_iproc_i2c_get_sda(struct i2c_adapter *adap) > +{ > + struct bcm_iproc_i2c_dev *iproc_i2c = i2c_get_adapdata(adap); > + u32 tmp; > + > + tmp = readl(iproc_i2c->base + M_BB_CTRL_OFFSET); > + > + return !!(tmp & BIT(M_BB_SMBDAT_IN_SHIFT)); > +} > + > +/* Check if bus lockup occurred, and invoke recovery if so. */ > +static void iproc_i2c_lockup_recover(struct bcm_iproc_i2c_dev *iproc_i2c) > +{ > + /* > + * assume bus lockup if SDA line is low; > + * note that there is no need to switch to > + * bit-bang mode for this check. > + */ > + if (!bcm_iproc_i2c_get_sda(&iproc_i2c->adapter)) { > + /* locked up - invoke i2c bus recovery. */ > + int ret = i2c_recover_bus(&iproc_i2c->adapter); > + > + if (ret) > + dev_err(iproc_i2c->device, "bus recovery: error %d\n", ret); > + } > +} > + > +static struct i2c_bus_recovery_info bcm_iproc_recovery_info = { > + .recover_bus = i2c_generic_scl_recovery, > + .prepare_recovery = bcm_iproc_i2c_prepare_recovery, > + .unprepare_recovery = bcm_iproc_i2c_unprepare_recovery, > + .set_scl = bcm_iproc_i2c_set_scl, > + .get_scl = bcm_iproc_i2c_get_scl, > + .set_sda = bcm_iproc_i2c_set_sda, > + .get_sda = bcm_iproc_i2c_get_sda, > +}; > + > static int bcm_iproc_i2c_check_status(struct bcm_iproc_i2c_dev *iproc_i2c, > struct i2c_msg *msg) > { > @@ -806,6 +954,7 @@ static int bcm_iproc_i2c_xfer_wait(struct bcm_iproc_i2c_dev *iproc_i2c, > /* flush both TX/RX FIFOs */ > val = BIT(M_FIFO_RX_FLUSH_SHIFT) | BIT(M_FIFO_TX_FLUSH_SHIFT); > iproc_i2c_wr_reg(iproc_i2c, M_FIFO_CTRL_OFFSET, val); > + iproc_i2c_lockup_recover(iproc_i2c); > return -ETIMEDOUT; > } > > @@ -814,6 +963,7 @@ static int bcm_iproc_i2c_xfer_wait(struct bcm_iproc_i2c_dev *iproc_i2c, > /* flush both TX/RX FIFOs */ > val = BIT(M_FIFO_RX_FLUSH_SHIFT) | BIT(M_FIFO_TX_FLUSH_SHIFT); > iproc_i2c_wr_reg(iproc_i2c, M_FIFO_CTRL_OFFSET, val); > + iproc_i2c_lockup_recover(iproc_i2c); > return ret; > } > > @@ -1111,6 +1261,7 @@ static int bcm_iproc_i2c_probe(struct platform_device *pdev) > of_node_full_name(iproc_i2c->device->of_node)); > adap->algo = &bcm_iproc_algo; > adap->quirks = &bcm_iproc_i2c_quirks; > + adap->bus_recovery_info = &bcm_iproc_recovery_info; > adap->dev.parent = &pdev->dev; > adap->dev.of_node = pdev->dev.of_node; > > @@ -1159,31 +1310,6 @@ static int bcm_iproc_i2c_suspend(struct device *dev) > return 0; > } > > -static int bcm_iproc_i2c_resume(struct device *dev) > -{ > - struct bcm_iproc_i2c_dev *iproc_i2c = dev_get_drvdata(dev); > - int ret; > - u32 val; > - > - /* > - * Power domain could have been shut off completely in system deep > - * sleep, so re-initialize the block here > - */ > - ret = bcm_iproc_i2c_init(iproc_i2c); > - if (ret) > - return ret; > - > - /* configure to the desired bus speed */ > - val = iproc_i2c_rd_reg(iproc_i2c, TIM_CFG_OFFSET); > - val &= ~BIT(TIM_CFG_MODE_400_SHIFT); > - val |= (iproc_i2c->bus_speed == I2C_MAX_FAST_MODE_FREQ) << TIM_CFG_MODE_400_SHIFT; > - iproc_i2c_wr_reg(iproc_i2c, TIM_CFG_OFFSET, val); > - > - bcm_iproc_i2c_enable_disable(iproc_i2c, true); > - > - return 0; > -} > - > static const struct dev_pm_ops bcm_iproc_i2c_pm_ops = { > .suspend_late = &bcm_iproc_i2c_suspend, > .resume_early = &bcm_iproc_i2c_resume > This latest change looks good to me. Thanks a lot! 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--000000000000b201fb05c3df97ed-- --===============2757008827986566631== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============2757008827986566631==--