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Thu, 05 Sep 2019 14:21:58 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id F2C1A50; Thu, 5 Sep 2019 12:21:54 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas21.st.com [10.75.90.44]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 59DE32CBDA5; Thu, 5 Sep 2019 14:21:54 +0200 (CEST) Received: from SAFEX1HUBCAS22.st.com (10.75.90.93) by SAFEX1HUBCAS21.st.com (10.75.90.44) with Microsoft SMTP Server (TLS) id 14.3.439.0; Thu, 5 Sep 2019 14:21:54 +0200 Received: from lmecxl0923.lme.st.com (10.48.0.237) by Webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.439.0; Thu, 5 Sep 2019 14:21:52 +0200 From: Ludovic Barre To: Ulf Hansson , Rob Herring Subject: [PATCH V6 2/3] mmc: mmci: add busy_complete callback Date: Thu, 5 Sep 2019 14:21:11 +0200 Message-ID: <20190905122112.29672-3-ludovic.Barre@st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190905122112.29672-1-ludovic.Barre@st.com> References: <20190905122112.29672-1-ludovic.Barre@st.com> MIME-Version: 1.0 X-Originating-IP: [10.48.0.237] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.70,1.0.8 definitions=2019-09-05_04:2019-09-04,2019-09-05 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190905_052204_961760_1C369258 X-CRM114-Status: GOOD ( 24.70 ) X-Spam-Score: -0.9 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [62.209.51.94 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Alexandre Torgue , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, srinivas.kandagatla@linaro.org, Ludovic Barre , Maxime Coquelin , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Ludovic Barre This patch adds busy_completion callback at mmci_host_ops to allow to define a specific busy completion by variant. The legacy code corresponding to busy completion used by ux500 variants is moved to ux500_busy_complete function. The busy_detect boolean property is replaced by busy_complete callback definition. Signed-off-by: Ludovic Barre --- drivers/mmc/host/mmci.c | 142 +++++++++++++++++++++------------------- drivers/mmc/host/mmci.h | 3 +- 2 files changed, 76 insertions(+), 69 deletions(-) diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index c30319255dc2..e20164f4354d 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -44,6 +44,7 @@ #define DRIVER_NAME "mmci-pl18x" static void mmci_variant_init(struct mmci_host *host); +static void ux500_variant_init(struct mmci_host *host); static void ux500v2_variant_init(struct mmci_host *host); static unsigned int fmax = 515633; @@ -175,7 +176,6 @@ static struct variant_data variant_ux500 = { .f_max = 100000000, .signal_direction = true, .pwrreg_clkgate = true, - .busy_detect = true, .busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE, .busy_detect_flag = MCI_ST_CARDBUSY, .busy_detect_mask = MCI_ST_BUSYENDMASK, @@ -184,7 +184,7 @@ static struct variant_data variant_ux500 = { .irq_pio_mask = MCI_IRQ_PIO_MASK, .start_err = MCI_STARTBITERR, .opendrain = MCI_OD, - .init = mmci_variant_init, + .init = ux500_variant_init, }; static struct variant_data variant_ux500v2 = { @@ -208,7 +208,6 @@ static struct variant_data variant_ux500v2 = { .f_max = 100000000, .signal_direction = true, .pwrreg_clkgate = true, - .busy_detect = true, .busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE, .busy_detect_flag = MCI_ST_CARDBUSY, .busy_detect_mask = MCI_ST_BUSYENDMASK, @@ -610,6 +609,67 @@ static u32 ux500v2_get_dctrl_cfg(struct mmci_host *host) return MCI_DPSM_ENABLE | (host->data->blksz << 16); } +static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk) +{ + void __iomem *base = host->base; + + /* + * Before unmasking for the busy end IRQ, confirm that the + * command was sent successfully. To keep track of having a + * command in-progress, waiting for busy signaling to end, + * store the status in host->busy_status. + * + * Note that, the card may need a couple of clock cycles before + * it starts signaling busy on DAT0, hence re-read the + * MMCISTATUS register here, to allow the busy bit to be set. + * Potentially we may even need to poll the register for a + * while, to allow it to be set, but tests indicates that it + * isn't needed. + */ + if (!host->busy_status && !(status & err_msk) && + (readl(base + MMCISTATUS) & host->variant->busy_detect_flag)) { + writel(readl(base + MMCIMASK0) | + host->variant->busy_detect_mask, + base + MMCIMASK0); + + host->busy_status = status & (MCI_CMDSENT | MCI_CMDRESPEND); + return false; + } + + /* + * If there is a command in-progress that has been successfully + * sent, then bail out if busy status is set and wait for the + * busy end IRQ. + * + * Note that, the HW triggers an IRQ on both edges while + * monitoring DAT0 for busy completion, but there is only one + * status bit in MMCISTATUS for the busy state. Therefore + * both the start and the end interrupts needs to be cleared, + * one after the other. So, clear the busy start IRQ here. + */ + if (host->busy_status && + (status & host->variant->busy_detect_flag)) { + writel(host->variant->busy_detect_mask, base + MMCICLEAR); + return false; + } + + /* + * If there is a command in-progress that has been successfully + * sent and the busy bit isn't set, it means we have received + * the busy end IRQ. Clear and mask the IRQ, then continue to + * process the command. + */ + if (host->busy_status) { + writel(host->variant->busy_detect_mask, base + MMCICLEAR); + + writel(readl(base + MMCIMASK0) & + ~host->variant->busy_detect_mask, base + MMCIMASK0); + host->busy_status = 0; + } + + return true; +} + /* * All the DMA operation mode stuff goes inside this ifdef. * This assumes that you have a generic DMA device interface, @@ -953,9 +1013,16 @@ void mmci_variant_init(struct mmci_host *host) host->ops = &mmci_variant_ops; } +void ux500_variant_init(struct mmci_host *host) +{ + host->ops = &mmci_variant_ops; + host->ops->busy_complete = ux500_busy_complete; +} + void ux500v2_variant_init(struct mmci_host *host) { host->ops = &mmci_variant_ops; + host->ops->busy_complete = ux500_busy_complete; host->ops->get_datactrl_cfg = ux500v2_get_dctrl_cfg; } @@ -1235,68 +1302,9 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd, return; /* Handle busy detection on DAT0 if the variant supports it. */ - if (busy_resp && host->variant->busy_detect) { - - /* - * Before unmasking for the busy end IRQ, confirm that the - * command was sent successfully. To keep track of having a - * command in-progress, waiting for busy signaling to end, - * store the status in host->busy_status. - * - * Note that, the card may need a couple of clock cycles before - * it starts signaling busy on DAT0, hence re-read the - * MMCISTATUS register here, to allow the busy bit to be set. - * Potentially we may even need to poll the register for a - * while, to allow it to be set, but tests indicates that it - * isn't needed. - */ - if (!host->busy_status && !(status & err_msk) && - (readl(base + MMCISTATUS) & host->variant->busy_detect_flag)) { - - writel(readl(base + MMCIMASK0) | - host->variant->busy_detect_mask, - base + MMCIMASK0); - - host->busy_status = - status & (MCI_CMDSENT|MCI_CMDRESPEND); - return; - } - - /* - * If there is a command in-progress that has been successfully - * sent, then bail out if busy status is set and wait for the - * busy end IRQ. - * - * Note that, the HW triggers an IRQ on both edges while - * monitoring DAT0 for busy completion, but there is only one - * status bit in MMCISTATUS for the busy state. Therefore - * both the start and the end interrupts needs to be cleared, - * one after the other. So, clear the busy start IRQ here. - */ - if (host->busy_status && - (status & host->variant->busy_detect_flag)) { - writel(host->variant->busy_detect_mask, - host->base + MMCICLEAR); + if (busy_resp && host->ops->busy_complete) + if (!host->ops->busy_complete(host, status, err_msk)) return; - } - - /* - * If there is a command in-progress that has been successfully - * sent and the busy bit isn't set, it means we have received - * the busy end IRQ. Clear and mask the IRQ, then continue to - * process the command. - */ - if (host->busy_status) { - - writel(host->variant->busy_detect_mask, - host->base + MMCICLEAR); - - writel(readl(base + MMCIMASK0) & - ~host->variant->busy_detect_mask, - base + MMCIMASK0); - host->busy_status = 0; - } - } host->cmd = NULL; @@ -1537,7 +1545,7 @@ static irqreturn_t mmci_irq(int irq, void *dev_id) * clear the corresponding IRQ. */ status &= readl(host->base + MMCIMASK0); - if (host->variant->busy_detect) + if (host->ops->busy_complete) writel(status & ~host->variant->busy_detect_mask, host->base + MMCICLEAR); else @@ -1605,7 +1613,7 @@ static void mmci_set_max_busy_timeout(struct mmc_host *mmc) struct mmci_host *host = mmc_priv(mmc); u32 max_busy_timeout = 0; - if (!host->variant->busy_detect) + if (!host->ops->busy_complete) return; if (host->variant->busy_timeout && mmc->actual_clock) @@ -1980,7 +1988,7 @@ static int mmci_probe(struct amba_device *dev, /* * Enable busy detection. */ - if (variant->busy_detect) { + if (host->ops->busy_complete) { mmci_ops.card_busy = mmci_card_busy; /* * Not all variants have a flag to enable busy detection diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h index d8b7f6774e8f..733f9a035b06 100644 --- a/drivers/mmc/host/mmci.h +++ b/drivers/mmc/host/mmci.h @@ -286,7 +286,6 @@ struct mmci_host; * @f_max: maximum clk frequency supported by the controller. * @signal_direction: input/out direction of bus signals can be indicated * @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock - * @busy_detect: true if the variant supports busy detection on DAT0. * @busy_timeout: true if the variant starts data timer when the DPSM * enter in Wait_R or Busy state. * @busy_dpsm_flag: bitmask enabling busy detection in the DPSM @@ -334,7 +333,6 @@ struct variant_data { u32 f_max; u8 signal_direction:1; u8 pwrreg_clkgate:1; - u8 busy_detect:1; u8 busy_timeout:1; u32 busy_dpsm_flag; u32 busy_detect_flag; @@ -369,6 +367,7 @@ struct mmci_host_ops { void (*dma_error)(struct mmci_host *host); void (*set_clkreg)(struct mmci_host *host, unsigned int desired); void (*set_pwrreg)(struct mmci_host *host, unsigned int pwr); + bool (*busy_complete)(struct mmci_host *host, u32 status, u32 err_msk); }; struct mmci_host {