From patchwork Fri May 29 03:58:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577659 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4F2941392 for ; Fri, 29 May 2020 03:59:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4060121501 for ; Fri, 29 May 2020 03:59:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388531AbgE2D7f (ORCPT ); Thu, 28 May 2020 23:59:35 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45288 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388507AbgE2D7e (ORCPT ); Thu, 28 May 2020 23:59:34 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 8576B80307CB; Fri, 29 May 2020 03:59:31 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8ioC51rXFyd1; Fri, 29 May 2020 06:59:30 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Andy Shevchenko , Rob Herring , , , , Subject: [PATCH v5 01/16] spi: dw: Set xfer effective_speed_hz Date: Fri, 29 May 2020 06:58:59 +0300 Message-ID: <20200529035915.20790-2-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Seeing DW APB SSI controller doesn't support setting the exactly requested SPI bus frequency, but only a rounded frequency determined by means of the odd-numbered half-worded reference clock divider, it would be good tune the SPI core up and initialize the current transfer effective_speed_hz. By doing so the core will be able to execute the xfer-related delays with better accuracy. Signed-off-by: Serge Semin Cc: Georgy Vlasov Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Andy Shevchenko Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- drivers/spi/spi-dw.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 9d6904d30104..050cb2ea0812 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -352,6 +352,7 @@ static int dw_spi_transfer_one(struct spi_controller *master, spi_set_clk(dws, chip->clk_div); } + transfer->effective_speed_hz = dws->max_freq / chip->clk_div; dws->n_bytes = DIV_ROUND_UP(transfer->bits_per_word, BITS_PER_BYTE); cr0 = dws->update_cr0(master, spi, transfer); From patchwork Fri May 29 03:59:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577723 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E2DA313B4 for ; Fri, 29 May 2020 04:01:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D45F32078C for ; Fri, 29 May 2020 04:01:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388584AbgE2D7g (ORCPT ); Thu, 28 May 2020 23:59:36 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45330 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388513AbgE2D7f (ORCPT ); Thu, 28 May 2020 23:59:35 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 5E3B78030807; Fri, 29 May 2020 03:59:32 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IZwmH6hUhcpO; Fri, 29 May 2020 06:59:31 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Andy Shevchenko , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 02/16] spi: dw: Return any value retrieved from the dma_transfer callback Date: Fri, 29 May 2020 06:59:00 +0300 Message-ID: <20200529035915.20790-3-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org DW APB SSI DMA may need to perform the synchronous operations. In that case the dma_transfer() callback will return 0 as a marker of the SPI transfer being finished so the SPI core can proceed with the SPI message trasnfers pumping procedure. This will be needed to fix the problem when DMA transactions are finished, but there is still data left in the SPI Tx/Rx buffers. But for now make dma_transfer to return 1 as the normal dw_spi_transfer_one() method. Signed-off-by: Serge Semin Cc: Georgy Vlasov Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Andy Shevchenko Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- drivers/spi/spi-dw-mid.c | 2 +- drivers/spi/spi-dw.c | 7 ++----- 2 files changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index b1710132b7b2..7ff1acaa55f8 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -288,7 +288,7 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) dma_async_issue_pending(dws->txchan); } - return 0; + return 1; } static void mid_spi_dma_stop(struct dw_spi *dws) diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 050cb2ea0812..6939e003e3e9 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -389,11 +389,8 @@ static int dw_spi_transfer_one(struct spi_controller *master, spi_enable_chip(dws, 1); - if (dws->dma_mapped) { - ret = dws->dma_ops->dma_transfer(dws, transfer); - if (ret < 0) - return ret; - } + if (dws->dma_mapped) + return dws->dma_ops->dma_transfer(dws, transfer); return 1; } From patchwork Fri May 29 03:59:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577719 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9C30D139A for ; Fri, 29 May 2020 04:01:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8E04E2074D for ; Fri, 29 May 2020 04:01:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388995AbgE2D7h (ORCPT ); Thu, 28 May 2020 23:59:37 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45350 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388517AbgE2D7g (ORCPT ); Thu, 28 May 2020 23:59:36 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 6969A8030776; Fri, 29 May 2020 03:59:33 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZNk5yuASX1PS; Fri, 29 May 2020 06:59:32 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Andy Shevchenko , Rob Herring , , , , Subject: [PATCH v5 03/16] spi: dw: Locally wait for the DMA transactions completion Date: Fri, 29 May 2020 06:59:01 +0300 Message-ID: <20200529035915.20790-4-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Even if DMA transactions are finished it doesn't mean that the SPI transfers are also completed. It's specifically concerns the Tx-only SPI transfers, since there might be data left in the SPI Tx FIFO after the DMA engine notifies that the Tx DMA procedure is done. In order to completely fix the problem first the driver has to wait for the DMA transaction completion, then for the corresponding SPI operations to be finished. In this commit we implement the former part of the solution. Note we can't just move the SPI operations wait procedure to the DMA completion callbacks, since these callbacks might be executed in the tasklet context (and they will be in case of the DW DMA). In case of slow SPI bus it can cause significant system performance drop. Signed-off-by: Serge Semin Cc: Georgy Vlasov Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Andy Shevchenko Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- drivers/spi/spi-dw-mid.c | 44 ++++++++++++++++++++++++++++++++++++---- drivers/spi/spi-dw.h | 2 ++ 2 files changed, 42 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 7ff1acaa55f8..355b641c4483 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -11,9 +11,11 @@ #include "spi-dw.h" #ifdef CONFIG_SPI_DW_MID_DMA +#include #include #include #include +#include #include #include @@ -66,6 +68,8 @@ static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) dws->master->dma_rx = dws->rxchan; dws->master->dma_tx = dws->txchan; + init_completion(&dws->dma_completion); + return 0; free_rxchan: @@ -91,6 +95,8 @@ static int mid_spi_dma_init_generic(struct device *dev, struct dw_spi *dws) dws->master->dma_rx = dws->rxchan; dws->master->dma_tx = dws->txchan; + init_completion(&dws->dma_completion); + return 0; } @@ -121,7 +127,7 @@ static irqreturn_t dma_transfer(struct dw_spi *dws) dev_err(&dws->master->dev, "%s: FIFO overrun/underrun\n", __func__); dws->master->cur_msg->status = -EIO; - spi_finalize_current_transfer(dws->master); + complete(&dws->dma_completion); return IRQ_HANDLED; } @@ -142,6 +148,29 @@ static enum dma_slave_buswidth convert_dma_width(u8 n_bytes) { return DMA_SLAVE_BUSWIDTH_UNDEFINED; } +static int dw_spi_dma_wait(struct dw_spi *dws, struct spi_transfer *xfer) +{ + unsigned long long ms; + + ms = xfer->len * MSEC_PER_SEC * BITS_PER_BYTE; + do_div(ms, xfer->effective_speed_hz); + ms += ms + 200; + + if (ms > UINT_MAX) + ms = UINT_MAX; + + ms = wait_for_completion_timeout(&dws->dma_completion, + msecs_to_jiffies(ms)); + + if (ms == 0) { + dev_err(&dws->master->cur_msg->spi->dev, + "DMA transaction timed out\n"); + return -ETIMEDOUT; + } + + return 0; +} + /* * dws->dma_chan_busy is set before the dma transfer starts, callback for tx * channel will clear a corresponding bit. @@ -155,7 +184,7 @@ static void dw_spi_dma_tx_done(void *arg) return; dw_writel(dws, DW_SPI_DMACR, 0); - spi_finalize_current_transfer(dws->master); + complete(&dws->dma_completion); } static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws, @@ -204,7 +233,7 @@ static void dw_spi_dma_rx_done(void *arg) return; dw_writel(dws, DW_SPI_DMACR, 0); - spi_finalize_current_transfer(dws->master); + complete(&dws->dma_completion); } static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws, @@ -260,6 +289,8 @@ static int mid_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) /* Set the interrupt mask */ spi_umask_intr(dws, imr); + reinit_completion(&dws->dma_completion); + dws->transfer_handler = dma_transfer; return 0; @@ -268,6 +299,7 @@ static int mid_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) { struct dma_async_tx_descriptor *txdesc, *rxdesc; + int ret; /* Prepare the TX dma transfer */ txdesc = dw_spi_dma_prepare_tx(dws, xfer); @@ -288,7 +320,11 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) dma_async_issue_pending(dws->txchan); } - return 1; + ret = dw_spi_dma_wait(dws, xfer); + if (ret) + return ret; + + return 0; } static void mid_spi_dma_stop(struct dw_spi *dws) diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 79782e93eb12..9585d0c83a6d 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -2,6 +2,7 @@ #ifndef DW_SPI_HEADER_H #define DW_SPI_HEADER_H +#include #include #include #include @@ -145,6 +146,7 @@ struct dw_spi { unsigned long dma_chan_busy; dma_addr_t dma_addr; /* phy address of the Data register */ const struct dw_spi_dma_ops *dma_ops; + struct completion dma_completion; #ifdef CONFIG_DEBUG_FS struct dentry *debugfs; From patchwork Fri May 29 03:59:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577717 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4AD3514F6 for ; Fri, 29 May 2020 04:01:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3C1812074D for ; Fri, 29 May 2020 04:01:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389319AbgE2D7i (ORCPT ); Thu, 28 May 2020 23:59:38 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45374 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388525AbgE2D7h (ORCPT ); Thu, 28 May 2020 23:59:37 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 4FB7C8030777; Fri, 29 May 2020 03:59:34 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fyflqadrPR6g; Fri, 29 May 2020 06:59:33 +0300 (MSK) From: Serge Semin To: Mark Brown , Vinod Koul , Feng Tang , Linus Walleij , Alan Cox , Grant Likely CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Andy Shevchenko , Rob Herring , , , , Subject: [PATCH v5 04/16] spi: dw: Add SPI Tx-done wait method to DMA-based transfer Date: Fri, 29 May 2020 06:59:02 +0300 Message-ID: <20200529035915.20790-5-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Since DMA transfers are performed asynchronously with actual SPI bus transfers, then even if DMA transactions are finished it doesn't mean all data is actually pushed to the SPI bus. Some data might still be in the controller FIFO. This is specifically true for Tx-only transfers. In this case if the next SPI transfer is recharged while a tail of the previous one is still in FIFO, we'll loose that tail data. In order to fix that problem let's add the wait procedure of the Tx SPI transfer completion after the DMA transactions are finished. Fixes: 7063c0d942a1 ("spi/dw_spi: add DMA support") Co-developed-by: Georgy Vlasov Signed-off-by: Georgy Vlasov Signed-off-by: Serge Semin Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Andy Shevchenko Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v2: - Use conditional statement instead of the ternary operator in the ref clock getter. - Move the patch to the head of the series so one could be picked up to the stable kernels as a fix. Changelog v3: - Use spi_delay_exec() method to wait for the current operation completion. Changelog v4: - Get back ndelay() method to wait for an SPI transfer completion. spi_delay_exec() isn't suitable for the atomic context. Changelog v5: - Add more detailed description of the problems the patch fixes. - Wait for the SPI Tx transfer finish in the mid_spi_dma_transfer() method executed in the task context. - Use spi_delay_exec() to wait for the SPI Tx completion, since now the driver does in the kernel thread context. - Use SPI_DELAY_UNIT_SCK spi_delay unit, since SPI xfer's are now have the effective_speed_hz initialized. --- drivers/spi/spi-dw-mid.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 355b641c4483..846e3db91329 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -19,6 +19,7 @@ #include #include +#define WAIT_RETRIES 5 #define RX_BUSY 0 #define TX_BUSY 1 @@ -171,6 +172,33 @@ static int dw_spi_dma_wait(struct dw_spi *dws, struct spi_transfer *xfer) return 0; } +static inline bool dw_spi_dma_tx_busy(struct dw_spi *dws) +{ + return !(dw_readl(dws, DW_SPI_SR) & SR_TF_EMPT); +} + +static int dw_spi_dma_wait_tx_done(struct dw_spi *dws, + struct spi_transfer *xfer) +{ + int retry = WAIT_RETRIES; + struct spi_delay delay; + u32 nents; + + nents = dw_readl(dws, DW_SPI_TXFLR); + delay.unit = SPI_DELAY_UNIT_SCK; + delay.value = nents * dws->n_bytes * BITS_PER_BYTE; + + while (dw_spi_dma_tx_busy(dws) && retry--) + spi_delay_exec(&delay, xfer); + + if (retry < 0) { + dev_err(&dws->master->dev, "Tx hanged up\n"); + return -EIO; + } + + return 0; +} + /* * dws->dma_chan_busy is set before the dma transfer starts, callback for tx * channel will clear a corresponding bit. @@ -324,6 +352,12 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) if (ret) return ret; + if (txdesc && dws->master->cur_msg->status == -EINPROGRESS) { + ret = dw_spi_dma_wait_tx_done(dws, xfer); + if (ret) + return ret; + } + return 0; } From patchwork Fri May 29 03:59:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577709 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C8CE9139A for ; Fri, 29 May 2020 04:01:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B852B20707 for ; Fri, 29 May 2020 04:01:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391688AbgE2EBA (ORCPT ); Fri, 29 May 2020 00:01:00 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45410 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388570AbgE2D7i (ORCPT ); Thu, 28 May 2020 23:59:38 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id A4EC38030772; Fri, 29 May 2020 03:59:34 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QASSozuuX7L8; Fri, 29 May 2020 06:59:34 +0300 (MSK) From: Serge Semin To: Mark Brown , Grant Likely , Linus Walleij , Feng Tang , Alan Cox , Vinod Koul CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Andy Shevchenko , Rob Herring , , , , Subject: [PATCH v5 05/16] spi: dw: Add SPI Rx-done wait method to DMA-based transfer Date: Fri, 29 May 2020 06:59:03 +0300 Message-ID: <20200529035915.20790-6-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Having any data left in the Rx FIFO after the DMA engine claimed it has finished all DMA transactions is an abnormal situation, since the DW SPI controller driver expects to have all the data being fetched and placed into the SPI Rx buffer at that moment. In case if this has happened we assume that DMA engine still may be doing the data fetching, thus we give it sometime to finish. If after a short period of time the data is still left in the Rx FIFO, the driver will give up waiting and return an error indicating that the SPI controller/DMA engine must have hung up or failed at some point of doing their duties. Fixes: 7063c0d942a1 ("spi/dw_spi: add DMA support") Co-developed-by: Georgy Vlasov Signed-off-by: Georgy Vlasov Signed-off-by: Serge Semin Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Andy Shevchenko Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v5: - Create a dedicated patch which adds the Rx-done wait method. - Add more detailed description of the problem the patch fixes. - Wait for the SPI Rx transfer finish in the mid_spi_dma_transfer() method executed in the task context. - Use spi_delay_exec() to wait for the SPI Rx completion, since now the driver does in the kernel thread context. - Wait for a delay correlated with the APB/SSI synchronous clock rate instead of using the SPI bus clock rate. --- drivers/spi/spi-dw-mid.c | 48 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 47 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 846e3db91329..4345881ebf66 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -248,6 +248,49 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws, return txdesc; } +static inline bool dw_spi_dma_rx_busy(struct dw_spi *dws) +{ + return !!(dw_readl(dws, DW_SPI_SR) & SR_RF_NOT_EMPT); +} + +static int dw_spi_dma_wait_rx_done(struct dw_spi *dws) +{ + int retry = WAIT_RETRIES; + struct spi_delay delay; + unsigned long ns, us; + u32 nents; + + /* + * It's unlikely that DMA engine is still doing the data fetching, but + * if it's let's give it some reasonable time. The timeout calculation + * is based on the synchronous APB/SSI reference clock rate, on a + * number of data entries left in the Rx FIFO, times a number of clock + * periods normally needed for a single APB read/write transaction + * without PREADY signal utilized (which is true for the DW APB SSI + * controller). + */ + nents = dw_readl(dws, DW_SPI_RXFLR); + ns = NSEC_PER_SEC / dws->max_freq * 4 * nents; + if (ns <= NSEC_PER_USEC) { + delay.unit = SPI_DELAY_UNIT_NSECS; + delay.value = ns; + } else { + us = DIV_ROUND_UP(ns, NSEC_PER_USEC); + delay.unit = SPI_DELAY_UNIT_USECS; + delay.value = clamp_val(us, 0, USHRT_MAX); + } + + while (dw_spi_dma_rx_busy(dws) && retry--) + spi_delay_exec(&delay, NULL); + + if (retry < 0) { + dev_err(&dws->master->dev, "Rx hanged up\n"); + return -EIO; + } + + return 0; +} + /* * dws->dma_chan_busy is set before the dma transfer starts, callback for rx * channel will clear a corresponding bit. @@ -358,7 +401,10 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) return ret; } - return 0; + if (rxdesc && dws->master->cur_msg->status == -EINPROGRESS) + ret = dw_spi_dma_wait_rx_done(dws); + + return ret; } static void mid_spi_dma_stop(struct dw_spi *dws) From patchwork Fri May 29 03:59:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577703 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7169F139A for ; Fri, 29 May 2020 04:00:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 63577212CC for ; Fri, 29 May 2020 04:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389400AbgE2D7j (ORCPT ); Thu, 28 May 2020 23:59:39 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45412 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388565AbgE2D7h (ORCPT ); Thu, 28 May 2020 23:59:37 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 36C9A8030839; Fri, 29 May 2020 03:59:35 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id USMqH9NTirNC; Fri, 29 May 2020 06:59:34 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Andy Shevchenko , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 06/16] spi: dw: Parameterize the DMA Rx/Tx burst length Date: Fri, 29 May 2020 06:59:04 +0300 Message-ID: <20200529035915.20790-7-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org It isn't good to have numeric literals in the code especially if there are multiple of them and they are related. Let's replace the Tx and Rx burst level literals with the corresponding constants. Co-developed-by: Georgy Vlasov Signed-off-by: Georgy Vlasov Co-developed-by: Ramil Zaripov Signed-off-by: Ramil Zaripov Signed-off-by: Serge Semin Reviewed-by: Andy Shevchenko Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v3: - Discard the dws->fifo_len utilization in the Tx FIFO DMA threshold setting. --- drivers/spi/spi-dw-mid.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 4345881ebf66..93463bdba0f8 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -21,7 +21,9 @@ #define WAIT_RETRIES 5 #define RX_BUSY 0 +#define RX_BURST_LEVEL 16 #define TX_BUSY 1 +#define TX_BURST_LEVEL 16 static bool mid_spi_dma_chan_filter(struct dma_chan *chan, void *param) { @@ -227,7 +229,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws, memset(&txconf, 0, sizeof(txconf)); txconf.direction = DMA_MEM_TO_DEV; txconf.dst_addr = dws->dma_addr; - txconf.dst_maxburst = 16; + txconf.dst_maxburst = TX_BURST_LEVEL; txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; txconf.dst_addr_width = convert_dma_width(dws->n_bytes); txconf.device_fc = false; @@ -319,7 +321,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws, memset(&rxconf, 0, sizeof(rxconf)); rxconf.direction = DMA_DEV_TO_MEM; rxconf.src_addr = dws->dma_addr; - rxconf.src_maxburst = 16; + rxconf.src_maxburst = RX_BURST_LEVEL; rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; rxconf.src_addr_width = convert_dma_width(dws->n_bytes); rxconf.device_fc = false; @@ -344,8 +346,8 @@ static int mid_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) { u16 imr = 0, dma_ctrl = 0; - dw_writel(dws, DW_SPI_DMARDLR, 0xf); - dw_writel(dws, DW_SPI_DMATDLR, 0x10); + dw_writel(dws, DW_SPI_DMARDLR, RX_BURST_LEVEL - 1); + dw_writel(dws, DW_SPI_DMATDLR, TX_BURST_LEVEL); if (xfer->tx_buf) { dma_ctrl |= SPI_DMA_TDMAE; From patchwork Fri May 29 03:59:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577667 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F1794139A for ; Fri, 29 May 2020 03:59:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E356C21508 for ; Fri, 29 May 2020 03:59:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390308AbgE2D7n (ORCPT ); Thu, 28 May 2020 23:59:43 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45418 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388744AbgE2D7k (ORCPT ); Thu, 28 May 2020 23:59:40 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id EC5DF8030779; Fri, 29 May 2020 03:59:35 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xT5FdjWP_obT; Fri, 29 May 2020 06:59:35 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Andy Shevchenko , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 07/16] spi: dw: Use DMA max burst to set the request thresholds Date: Fri, 29 May 2020 06:59:05 +0300 Message-ID: <20200529035915.20790-8-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Each channel of DMA controller may have a limited length of burst transaction (number of IO operations performed at ones in a single DMA client request). This parameter can be used to setup the most optimal DMA Tx/Rx data level values. In order to avoid the Tx buffer overrun we can set the DMA Tx level to be of FIFO depth minus the maximum burst transactions length. To prevent the Rx buffer underflow the DMA Rx level should be set to the maximum burst transactions length. This commit setups the DMA channels and the DW SPI DMA Tx/Rx levels in accordance with these rules. Signed-off-by: Serge Semin Reviewed-by: Andy Shevchenko Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v3: - Use min() method to calculate the optimal burst values. --- drivers/spi/spi-dw-mid.c | 37 +++++++++++++++++++++++++++++++++---- drivers/spi/spi-dw.h | 2 ++ 2 files changed, 35 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 93463bdba0f8..ff79b4239d68 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -36,6 +36,31 @@ static bool mid_spi_dma_chan_filter(struct dma_chan *chan, void *param) return true; } +static void mid_spi_maxburst_init(struct dw_spi *dws) +{ + struct dma_slave_caps caps; + u32 max_burst, def_burst; + int ret; + + def_burst = dws->fifo_len / 2; + + ret = dma_get_slave_caps(dws->rxchan, &caps); + if (!ret && caps.max_burst) + max_burst = caps.max_burst; + else + max_burst = RX_BURST_LEVEL; + + dws->rxburst = min(max_burst, def_burst); + + ret = dma_get_slave_caps(dws->txchan, &caps); + if (!ret && caps.max_burst) + max_burst = caps.max_burst; + else + max_burst = TX_BURST_LEVEL; + + dws->txburst = min(max_burst, def_burst); +} + static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) { struct dw_dma_slave slave = { @@ -73,6 +98,8 @@ static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) init_completion(&dws->dma_completion); + mid_spi_maxburst_init(dws); + return 0; free_rxchan: @@ -100,6 +127,8 @@ static int mid_spi_dma_init_generic(struct device *dev, struct dw_spi *dws) init_completion(&dws->dma_completion); + mid_spi_maxburst_init(dws); + return 0; } @@ -229,7 +258,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws, memset(&txconf, 0, sizeof(txconf)); txconf.direction = DMA_MEM_TO_DEV; txconf.dst_addr = dws->dma_addr; - txconf.dst_maxburst = TX_BURST_LEVEL; + txconf.dst_maxburst = dws->txburst; txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; txconf.dst_addr_width = convert_dma_width(dws->n_bytes); txconf.device_fc = false; @@ -321,7 +350,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws, memset(&rxconf, 0, sizeof(rxconf)); rxconf.direction = DMA_DEV_TO_MEM; rxconf.src_addr = dws->dma_addr; - rxconf.src_maxburst = RX_BURST_LEVEL; + rxconf.src_maxburst = dws->rxburst; rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; rxconf.src_addr_width = convert_dma_width(dws->n_bytes); rxconf.device_fc = false; @@ -346,8 +375,8 @@ static int mid_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) { u16 imr = 0, dma_ctrl = 0; - dw_writel(dws, DW_SPI_DMARDLR, RX_BURST_LEVEL - 1); - dw_writel(dws, DW_SPI_DMATDLR, TX_BURST_LEVEL); + dw_writel(dws, DW_SPI_DMARDLR, dws->rxburst - 1); + dw_writel(dws, DW_SPI_DMATDLR, dws->fifo_len - dws->txburst); if (xfer->tx_buf) { dma_ctrl |= SPI_DMA_TDMAE; diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 9585d0c83a6d..9247670fcdfb 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -142,7 +142,9 @@ struct dw_spi { /* DMA info */ struct dma_chan *txchan; + u32 txburst; struct dma_chan *rxchan; + u32 rxburst; unsigned long dma_chan_busy; dma_addr_t dma_addr; /* phy address of the Data register */ const struct dw_spi_dma_ops *dma_ops; From patchwork Fri May 29 03:59:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577711 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CA21313B4 for ; Fri, 29 May 2020 04:01:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2A572074D for ; Fri, 29 May 2020 04:01:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391672AbgE2EBA (ORCPT ); Fri, 29 May 2020 00:01:00 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45432 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389144AbgE2D7i (ORCPT ); Thu, 28 May 2020 23:59:38 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 936EF8030778; Fri, 29 May 2020 03:59:36 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1ssxlNDJj-6q; Fri, 29 May 2020 06:59:36 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Andy Shevchenko , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 08/16] spi: dw: Fix Rx-only DMA transfers Date: Fri, 29 May 2020 06:59:06 +0300 Message-ID: <20200529035915.20790-9-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Tx-only DMA transfers are working perfectly fine since in this case the code just ignores the Rx FIFO overflow interrupts. But it turns out the SPI Rx-only transfers are broken since nothing pushing any data to the shift registers, so the Rx FIFO is left empty and the SPI core subsystems just returns a timeout error. Since DW DMAC driver doesn't support something like cyclic write operations of a single byte to a device register, the only way to support the Rx-only SPI transfers is to fake it by using a dummy Tx-buffer. This is what we intend to fix in this commit by setting the SPI_CONTROLLER_MUST_TX flag for DMA-capable platform. Signed-off-by: Serge Semin Reviewed-by: Andy Shevchenko Cc: Georgy Vlasov Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- drivers/spi/spi-dw.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 6939e003e3e9..4d1849699a12 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -515,6 +515,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) dev_warn(dev, "DMA init failed\n"); } else { master->can_dma = dws->dma_ops->can_dma; + master->flags |= SPI_CONTROLLER_MUST_TX; } } From patchwork Fri May 29 03:59:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577695 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 57D5F139A for ; Fri, 29 May 2020 04:00:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 486382074D for ; Fri, 29 May 2020 04:00:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389506AbgE2D7l (ORCPT ); Thu, 28 May 2020 23:59:41 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45454 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389305AbgE2D7k (ORCPT ); Thu, 28 May 2020 23:59:40 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 70360803077A; Fri, 29 May 2020 03:59:37 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id N8_5g2D6vp7n; Fri, 29 May 2020 06:59:36 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Andy Shevchenko , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Feng Tang , Rob Herring , Arnd Bergmann , , , , Subject: [PATCH v5 09/16] spi: dw: Add core suffix to the DW APB SSI core source file Date: Fri, 29 May 2020 06:59:07 +0300 Message-ID: <20200529035915.20790-10-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Generic DMA support is going to be part of the DW APB SSI core object. In order to preserve the kernel loadable module name as spi-dw.ko, let's add the "-core" suffix to the object with generic DW APB SSI code and build it into the target spi-dw.ko driver. Signed-off-by: Serge Semin Suggested-by: Andy Shevchenko Reviewed-by: Andy Shevchenko Cc: Georgy Vlasov Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Feng Tang Cc: Rob Herring Cc: Arnd Bergmann Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v3: - This is a new patch added as a result of the discussion with Andy Shevchenko. --- drivers/spi/Makefile | 1 + drivers/spi/{spi-dw.c => spi-dw-core.c} | 0 2 files changed, 1 insertion(+) rename drivers/spi/{spi-dw.c => spi-dw-core.c} (100%) diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 28f601327f8c..70ebc2a62e5f 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_SPI_COLDFIRE_QSPI) += spi-coldfire-qspi.o obj-$(CONFIG_SPI_DAVINCI) += spi-davinci.o obj-$(CONFIG_SPI_DLN2) += spi-dln2.o obj-$(CONFIG_SPI_DESIGNWARE) += spi-dw.o +spi-dw-y := spi-dw-core.o obj-$(CONFIG_SPI_DW_MMIO) += spi-dw-mmio.o obj-$(CONFIG_SPI_DW_PCI) += spi-dw-midpci.o spi-dw-midpci-objs := spi-dw-pci.o spi-dw-mid.o diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw-core.c similarity index 100% rename from drivers/spi/spi-dw.c rename to drivers/spi/spi-dw-core.c From patchwork Fri May 29 03:59:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577701 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4D23A13B4 for ; Fri, 29 May 2020 04:00:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 35C8D21548 for ; Fri, 29 May 2020 04:00:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391445AbgE2EAw (ORCPT ); Fri, 29 May 2020 00:00:52 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45412 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389387AbgE2D7l (ORCPT ); Thu, 28 May 2020 23:59:41 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id E75D9803078F; Fri, 29 May 2020 03:59:38 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gB-UnZMQ5-tN; Fri, 29 May 2020 06:59:38 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Andy Shevchenko , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 10/16] spi: dw: Move Non-DMA code to the DW PCIe-SPI driver Date: Fri, 29 May 2020 06:59:08 +0300 Message-ID: <20200529035915.20790-11-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This is a preparation patch before adding the DW DMA support into the DW SPI MMIO driver. We need to unpin the Non-DMA-specific code from the intended to be generic DW APB SSI DMA code. This isn't that hard, since the most part of the spi-dw-mid.c driver in fact implements a generic DMA interface for the DW SPI controller driver. The only Intel MID specifics concern getting the max frequency from the MRST Clock Control Unit and fetching the DMA controller channels from corresponding PCIe DMA controller. Since first one is related with the SPI interface configuration we moved it' implementation into the DW PCIe-SPI driver module. After that former spi-dw-mid.c file can be just renamed to be the DW SPI DMA module optionally compiled in to the DW APB SSI core driver. Co-developed-by: Georgy Vlasov Signed-off-by: Georgy Vlasov Co-developed-by: Ramil Zaripov Signed-off-by: Ramil Zaripov Signed-off-by: Serge Semin Reviewed-by: Andy Shevchenko Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v2: - Compile the DW SPI DMA module into the DW APB SSI core instead of being a separate driver. --- drivers/spi/Kconfig | 8 +-- drivers/spi/Makefile | 4 +- drivers/spi/{spi-dw-mid.c => spi-dw-dma.c} | 66 +++------------------- drivers/spi/spi-dw-pci.c | 50 +++++++++++++++- drivers/spi/spi-dw.h | 14 ++++- 5 files changed, 73 insertions(+), 69 deletions(-) rename drivers/spi/{spi-dw-mid.c => spi-dw-dma.c} (88%) diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 741b9140992a..03b061975f70 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -226,14 +226,14 @@ config SPI_DESIGNWARE help general driver for SPI controller core from DesignWare +config SPI_DW_DMA + bool "DMA support for DW SPI controller" + depends on SPI_DESIGNWARE && DW_DMAC_PCI + config SPI_DW_PCI tristate "PCI interface driver for DW SPI core" depends on SPI_DESIGNWARE && PCI -config SPI_DW_MID_DMA - bool "DMA support for DW SPI controller on Intel MID platform" - depends on SPI_DW_PCI && DW_DMAC_PCI - config SPI_DW_MMIO tristate "Memory-mapped io interface driver for DW SPI core" depends on SPI_DESIGNWARE diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 70ebc2a62e5f..c4aa80085257 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -37,9 +37,9 @@ obj-$(CONFIG_SPI_DAVINCI) += spi-davinci.o obj-$(CONFIG_SPI_DLN2) += spi-dln2.o obj-$(CONFIG_SPI_DESIGNWARE) += spi-dw.o spi-dw-y := spi-dw-core.o +spi-dw-$(CONFIG_SPI_DW_DMA) += spi-dw-dma.o obj-$(CONFIG_SPI_DW_MMIO) += spi-dw-mmio.o -obj-$(CONFIG_SPI_DW_PCI) += spi-dw-midpci.o -spi-dw-midpci-objs := spi-dw-pci.o spi-dw-mid.o +obj-$(CONFIG_SPI_DW_PCI) += spi-dw-pci.o obj-$(CONFIG_SPI_EFM32) += spi-efm32.o obj-$(CONFIG_SPI_EP93XX) += spi-ep93xx.o obj-$(CONFIG_SPI_FALCON) += spi-falcon.o diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-dma.c similarity index 88% rename from drivers/spi/spi-dw-mid.c rename to drivers/spi/spi-dw-dma.c index ff79b4239d68..30bd9800f2df 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-dma.c @@ -1,16 +1,10 @@ // SPDX-License-Identifier: GPL-2.0-only /* - * Special handling for DW core on Intel MID platform + * Special handling for DW DMA core * * Copyright (c) 2009, 2014 Intel Corporation. */ -#include -#include - -#include "spi-dw.h" - -#ifdef CONFIG_SPI_DW_MID_DMA #include #include #include @@ -18,6 +12,10 @@ #include #include #include +#include +#include + +#include "spi-dw.h" #define WAIT_RETRIES 5 #define RX_BUSY 0 @@ -461,10 +459,11 @@ static const struct dw_spi_dma_ops mfld_dma_ops = { .dma_stop = mid_spi_dma_stop, }; -static void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws) +void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws) { dws->dma_ops = &mfld_dma_ops; } +EXPORT_SYMBOL_GPL(dw_spi_mid_setup_dma_mfld); static const struct dw_spi_dma_ops generic_dma_ops = { .dma_init = mid_spi_dma_init_generic, @@ -475,55 +474,8 @@ static const struct dw_spi_dma_ops generic_dma_ops = { .dma_stop = mid_spi_dma_stop, }; -static void dw_spi_mid_setup_dma_generic(struct dw_spi *dws) +void dw_spi_mid_setup_dma_generic(struct dw_spi *dws) { dws->dma_ops = &generic_dma_ops; } -#else /* CONFIG_SPI_DW_MID_DMA */ -static inline void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws) {} -static inline void dw_spi_mid_setup_dma_generic(struct dw_spi *dws) {} -#endif - -/* Some specific info for SPI0 controller on Intel MID */ - -/* HW info for MRST Clk Control Unit, 32b reg per controller */ -#define MRST_SPI_CLK_BASE 100000000 /* 100m */ -#define MRST_CLK_SPI_REG 0xff11d86c -#define CLK_SPI_BDIV_OFFSET 0 -#define CLK_SPI_BDIV_MASK 0x00000007 -#define CLK_SPI_CDIV_OFFSET 9 -#define CLK_SPI_CDIV_MASK 0x00000e00 -#define CLK_SPI_DISABLE_OFFSET 8 - -int dw_spi_mid_init_mfld(struct dw_spi *dws) -{ - void __iomem *clk_reg; - u32 clk_cdiv; - - clk_reg = ioremap(MRST_CLK_SPI_REG, 16); - if (!clk_reg) - return -ENOMEM; - - /* Get SPI controller operating freq info */ - clk_cdiv = readl(clk_reg + dws->bus_num * sizeof(u32)); - clk_cdiv &= CLK_SPI_CDIV_MASK; - clk_cdiv >>= CLK_SPI_CDIV_OFFSET; - dws->max_freq = MRST_SPI_CLK_BASE / (clk_cdiv + 1); - - iounmap(clk_reg); - - /* Register hook to configure CTRLR0 */ - dws->update_cr0 = dw_spi_update_cr0; - - dw_spi_mid_setup_dma_mfld(dws); - return 0; -} - -int dw_spi_mid_init_generic(struct dw_spi *dws) -{ - /* Register hook to configure CTRLR0 */ - dws->update_cr0 = dw_spi_update_cr0; - - dw_spi_mid_setup_dma_generic(dws); - return 0; -} +EXPORT_SYMBOL_GPL(dw_spi_mid_setup_dma_generic); diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c index dde54a918b5d..c13707b8493e 100644 --- a/drivers/spi/spi-dw-pci.c +++ b/drivers/spi/spi-dw-pci.c @@ -15,6 +15,15 @@ #define DRIVER_NAME "dw_spi_pci" +/* HW info for MRST Clk Control Unit, 32b reg per controller */ +#define MRST_SPI_CLK_BASE 100000000 /* 100m */ +#define MRST_CLK_SPI_REG 0xff11d86c +#define CLK_SPI_BDIV_OFFSET 0 +#define CLK_SPI_BDIV_MASK 0x00000007 +#define CLK_SPI_CDIV_OFFSET 9 +#define CLK_SPI_CDIV_MASK 0x00000e00 +#define CLK_SPI_DISABLE_OFFSET 8 + struct spi_pci_desc { int (*setup)(struct dw_spi *); u16 num_cs; @@ -22,20 +31,55 @@ struct spi_pci_desc { u32 max_freq; }; +static int spi_mid_init(struct dw_spi *dws) +{ + void __iomem *clk_reg; + u32 clk_cdiv; + + clk_reg = ioremap(MRST_CLK_SPI_REG, 16); + if (!clk_reg) + return -ENOMEM; + + /* Get SPI controller operating freq info */ + clk_cdiv = readl(clk_reg + dws->bus_num * sizeof(u32)); + clk_cdiv &= CLK_SPI_CDIV_MASK; + clk_cdiv >>= CLK_SPI_CDIV_OFFSET; + dws->max_freq = MRST_SPI_CLK_BASE / (clk_cdiv + 1); + + iounmap(clk_reg); + + /* Register hook to configure CTRLR0 */ + dws->update_cr0 = dw_spi_update_cr0; + + dw_spi_mid_setup_dma_mfld(dws); + + return 0; +} + +static int spi_generic_init(struct dw_spi *dws) +{ + /* Register hook to configure CTRLR0 */ + dws->update_cr0 = dw_spi_update_cr0; + + dw_spi_mid_setup_dma_generic(dws); + + return 0; +} + static struct spi_pci_desc spi_pci_mid_desc_1 = { - .setup = dw_spi_mid_init_mfld, + .setup = spi_mid_init, .num_cs = 5, .bus_num = 0, }; static struct spi_pci_desc spi_pci_mid_desc_2 = { - .setup = dw_spi_mid_init_mfld, + .setup = spi_mid_init, .num_cs = 2, .bus_num = 1, }; static struct spi_pci_desc spi_pci_ehl_desc = { - .setup = dw_spi_mid_init_generic, + .setup = spi_generic_init, .num_cs = 2, .bus_num = -1, .max_freq = 100000000, diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 9247670fcdfb..91608cf12636 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -257,8 +257,16 @@ extern u32 dw_spi_update_cr0_v1_01a(struct spi_controller *master, struct spi_device *spi, struct spi_transfer *transfer); -/* platform related setup */ -extern int dw_spi_mid_init_mfld(struct dw_spi *dws); -extern int dw_spi_mid_init_generic(struct dw_spi *dws); +#ifdef CONFIG_SPI_DW_DMA + +extern void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws); +extern void dw_spi_mid_setup_dma_generic(struct dw_spi *dws); + +#else + +static inline void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws) {} +static inline void dw_spi_mid_setup_dma_generic(struct dw_spi *dws) {} + +#endif /* !CONFIG_SPI_DW_DMA */ #endif /* DW_SPI_HEADER_H */ From patchwork Fri May 29 03:59:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577687 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B15B3139A for ; Fri, 29 May 2020 04:00:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 987B9207D3 for ; Fri, 29 May 2020 04:00:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389567AbgE2D7m (ORCPT ); Thu, 28 May 2020 23:59:42 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45478 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389447AbgE2D7l (ORCPT ); Thu, 28 May 2020 23:59:41 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 49785803079C; Fri, 29 May 2020 03:59:39 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CYsBNvkYaqym; Fri, 29 May 2020 06:59:38 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Andy Shevchenko , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 11/16] spi: dw: Remove DW DMA code dependency from DW_DMAC_PCI Date: Fri, 29 May 2020 06:59:09 +0300 Message-ID: <20200529035915.20790-12-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Since there is a generic method available to initialize the DW SPI DMA interface on any DT and ACPI-based platforms, which in general can be designed with not only DW DMAC but with any DMA engine on board, we can freely remove the CONFIG_DW_DMAC_PCI config from dependency list of CONFIG_SPI_DW_DMA. Especially seeing that we don't use anything DW DMAC specific in the new driver. Co-developed-by: Georgy Vlasov Signed-off-by: Georgy Vlasov Co-developed-by: Ramil Zaripov Signed-off-by: Ramil Zaripov Signed-off-by: Serge Semin Reviewed-by: Andy Shevchenko Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- drivers/spi/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 03b061975f70..6a84f3dad35c 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -228,7 +228,7 @@ config SPI_DESIGNWARE config SPI_DW_DMA bool "DMA support for DW SPI controller" - depends on SPI_DESIGNWARE && DW_DMAC_PCI + depends on SPI_DESIGNWARE config SPI_DW_PCI tristate "PCI interface driver for DW SPI core" From patchwork Fri May 29 03:59:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577691 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 78ED9139A for ; Fri, 29 May 2020 04:00:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6121F207D3 for ; Fri, 29 May 2020 04:00:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389579AbgE2EAq (ORCPT ); Fri, 29 May 2020 00:00:46 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45492 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389465AbgE2D7m (ORCPT ); Thu, 28 May 2020 23:59:42 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id EB7DE8029EA0; Fri, 29 May 2020 03:59:39 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mxHYci5PNTca; Fri, 29 May 2020 06:59:39 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Andy Shevchenko , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 12/16] spi: dw: Add DW SPI DMA/PCI/MMIO dependency on the DW SPI core Date: Fri, 29 May 2020 06:59:10 +0300 Message-ID: <20200529035915.20790-13-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Seeing all of the DW SPI driver components like DW SPI DMA/PCI/MMIO depend on the DW SPI core code it's better to use the if-endif conditional kernel config statement to signify that common dependency. Co-developed-by: Georgy Vlasov Signed-off-by: Georgy Vlasov Co-developed-by: Ramil Zaripov Signed-off-by: Ramil Zaripov Signed-off-by: Serge Semin Reviewed-by: Andy Shevchenko Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- drivers/spi/Kconfig | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 6a84f3dad35c..3cdf8310d185 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -226,17 +226,20 @@ config SPI_DESIGNWARE help general driver for SPI controller core from DesignWare +if SPI_DESIGNWARE + config SPI_DW_DMA bool "DMA support for DW SPI controller" - depends on SPI_DESIGNWARE config SPI_DW_PCI tristate "PCI interface driver for DW SPI core" - depends on SPI_DESIGNWARE && PCI + depends on PCI config SPI_DW_MMIO tristate "Memory-mapped io interface driver for DW SPI core" - depends on SPI_DESIGNWARE + depends on HAS_IOMEM + +endif config SPI_DLN2 tristate "Diolan DLN-2 USB SPI adapter" From patchwork Fri May 29 03:59:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577671 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 39CAB139A for ; Fri, 29 May 2020 04:00:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 21F57207D3 for ; Fri, 29 May 2020 04:00:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726082AbgE2EAQ (ORCPT ); Fri, 29 May 2020 00:00:16 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45432 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389498AbgE2D7n (ORCPT ); Thu, 28 May 2020 23:59:43 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 3954F8029EA3; Fri, 29 May 2020 03:59:41 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ygwuWnJksRuj; Fri, 29 May 2020 06:59:40 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Andy Shevchenko , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 13/16] spi: dw: Cleanup generic DW DMA code namings Date: Fri, 29 May 2020 06:59:11 +0300 Message-ID: <20200529035915.20790-14-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Since from now the former Intel MID platform layer is used as a generic DW SPI DMA module, let's alter the internal methods naming to be DMA-related instead of having the "mid_" prefix. Co-developed-by: Georgy Vlasov Signed-off-by: Georgy Vlasov Co-developed-by: Ramil Zaripov Signed-off-by: Ramil Zaripov Signed-off-by: Serge Semin Reviewed-by: Andy Shevchenko Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v2: - Leave the DMA setup method suffixes to be mfld and generic. --- drivers/spi/spi-dw-dma.c | 85 ++++++++++++++++++++-------------------- drivers/spi/spi-dw-pci.c | 4 +- drivers/spi/spi-dw.h | 8 ++-- 3 files changed, 49 insertions(+), 48 deletions(-) diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c index 30bd9800f2df..69b7051e5323 100644 --- a/drivers/spi/spi-dw-dma.c +++ b/drivers/spi/spi-dw-dma.c @@ -23,7 +23,7 @@ #define TX_BUSY 1 #define TX_BURST_LEVEL 16 -static bool mid_spi_dma_chan_filter(struct dma_chan *chan, void *param) +static bool dw_spi_dma_chan_filter(struct dma_chan *chan, void *param) { struct dw_dma_slave *s = param; @@ -34,7 +34,7 @@ static bool mid_spi_dma_chan_filter(struct dma_chan *chan, void *param) return true; } -static void mid_spi_maxburst_init(struct dw_spi *dws) +static void dw_spi_dma_maxburst_init(struct dw_spi *dws) { struct dma_slave_caps caps; u32 max_burst, def_burst; @@ -59,7 +59,7 @@ static void mid_spi_maxburst_init(struct dw_spi *dws) dws->txburst = min(max_burst, def_burst); } -static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) +static int dw_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) { struct dw_dma_slave slave = { .src_id = 0, @@ -81,13 +81,13 @@ static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) /* 1. Init rx channel */ slave.dma_dev = &dma_dev->dev; - dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, &slave); + dws->rxchan = dma_request_channel(mask, dw_spi_dma_chan_filter, &slave); if (!dws->rxchan) goto err_exit; /* 2. Init tx channel */ slave.dst_id = 1; - dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, &slave); + dws->txchan = dma_request_channel(mask, dw_spi_dma_chan_filter, &slave); if (!dws->txchan) goto free_rxchan; @@ -96,7 +96,7 @@ static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) init_completion(&dws->dma_completion); - mid_spi_maxburst_init(dws); + dw_spi_dma_maxburst_init(dws); return 0; @@ -107,7 +107,7 @@ static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) return -EBUSY; } -static int mid_spi_dma_init_generic(struct device *dev, struct dw_spi *dws) +static int dw_spi_dma_init_generic(struct device *dev, struct dw_spi *dws) { dws->rxchan = dma_request_slave_channel(dev, "rx"); if (!dws->rxchan) @@ -125,12 +125,12 @@ static int mid_spi_dma_init_generic(struct device *dev, struct dw_spi *dws) init_completion(&dws->dma_completion); - mid_spi_maxburst_init(dws); + dw_spi_dma_maxburst_init(dws); return 0; } -static void mid_spi_dma_exit(struct dw_spi *dws) +static void dw_spi_dma_exit(struct dw_spi *dws) { if (dws->txchan) { dmaengine_terminate_sync(dws->txchan); @@ -145,7 +145,7 @@ static void mid_spi_dma_exit(struct dw_spi *dws) dw_writel(dws, DW_SPI_DMACR, 0); } -static irqreturn_t dma_transfer(struct dw_spi *dws) +static irqreturn_t dw_spi_dma_transfer_handler(struct dw_spi *dws) { u16 irq_status = dw_readl(dws, DW_SPI_ISR); @@ -161,15 +161,16 @@ static irqreturn_t dma_transfer(struct dw_spi *dws) return IRQ_HANDLED; } -static bool mid_spi_can_dma(struct spi_controller *master, - struct spi_device *spi, struct spi_transfer *xfer) +static bool dw_spi_can_dma(struct spi_controller *master, + struct spi_device *spi, struct spi_transfer *xfer) { struct dw_spi *dws = spi_controller_get_devdata(master); return xfer->len > dws->fifo_len; } -static enum dma_slave_buswidth convert_dma_width(u8 n_bytes) { +static enum dma_slave_buswidth dw_spi_dma_convert_width(u8 n_bytes) +{ if (n_bytes == 1) return DMA_SLAVE_BUSWIDTH_1_BYTE; else if (n_bytes == 2) @@ -244,8 +245,8 @@ static void dw_spi_dma_tx_done(void *arg) complete(&dws->dma_completion); } -static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws, - struct spi_transfer *xfer) +static struct dma_async_tx_descriptor * +dw_spi_dma_prepare_tx(struct dw_spi *dws, struct spi_transfer *xfer) { struct dma_slave_config txconf; struct dma_async_tx_descriptor *txdesc; @@ -258,7 +259,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws, txconf.dst_addr = dws->dma_addr; txconf.dst_maxburst = dws->txburst; txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; - txconf.dst_addr_width = convert_dma_width(dws->n_bytes); + txconf.dst_addr_width = dw_spi_dma_convert_width(dws->n_bytes); txconf.device_fc = false; dmaengine_slave_config(dws->txchan, &txconf); @@ -350,7 +351,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws, rxconf.src_addr = dws->dma_addr; rxconf.src_maxburst = dws->rxburst; rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; - rxconf.src_addr_width = convert_dma_width(dws->n_bytes); + rxconf.src_addr_width = dw_spi_dma_convert_width(dws->n_bytes); rxconf.device_fc = false; dmaengine_slave_config(dws->rxchan, &rxconf); @@ -369,7 +370,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws, return rxdesc; } -static int mid_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) +static int dw_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) { u16 imr = 0, dma_ctrl = 0; @@ -391,12 +392,12 @@ static int mid_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) reinit_completion(&dws->dma_completion); - dws->transfer_handler = dma_transfer; + dws->transfer_handler = dw_spi_dma_transfer_handler; return 0; } -static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) +static int dw_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) { struct dma_async_tx_descriptor *txdesc, *rxdesc; int ret; @@ -436,7 +437,7 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) return ret; } -static void mid_spi_dma_stop(struct dw_spi *dws) +static void dw_spi_dma_stop(struct dw_spi *dws) { if (test_bit(TX_BUSY, &dws->dma_chan_busy)) { dmaengine_terminate_sync(dws->txchan); @@ -450,32 +451,32 @@ static void mid_spi_dma_stop(struct dw_spi *dws) dw_writel(dws, DW_SPI_DMACR, 0); } -static const struct dw_spi_dma_ops mfld_dma_ops = { - .dma_init = mid_spi_dma_init_mfld, - .dma_exit = mid_spi_dma_exit, - .dma_setup = mid_spi_dma_setup, - .can_dma = mid_spi_can_dma, - .dma_transfer = mid_spi_dma_transfer, - .dma_stop = mid_spi_dma_stop, +static const struct dw_spi_dma_ops dw_spi_dma_mfld_ops = { + .dma_init = dw_spi_dma_init_mfld, + .dma_exit = dw_spi_dma_exit, + .dma_setup = dw_spi_dma_setup, + .can_dma = dw_spi_can_dma, + .dma_transfer = dw_spi_dma_transfer, + .dma_stop = dw_spi_dma_stop, }; -void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws) +void dw_spi_dma_setup_mfld(struct dw_spi *dws) { - dws->dma_ops = &mfld_dma_ops; + dws->dma_ops = &dw_spi_dma_mfld_ops; } -EXPORT_SYMBOL_GPL(dw_spi_mid_setup_dma_mfld); - -static const struct dw_spi_dma_ops generic_dma_ops = { - .dma_init = mid_spi_dma_init_generic, - .dma_exit = mid_spi_dma_exit, - .dma_setup = mid_spi_dma_setup, - .can_dma = mid_spi_can_dma, - .dma_transfer = mid_spi_dma_transfer, - .dma_stop = mid_spi_dma_stop, +EXPORT_SYMBOL_GPL(dw_spi_dma_setup_mfld); + +static const struct dw_spi_dma_ops dw_spi_dma_generic_ops = { + .dma_init = dw_spi_dma_init_generic, + .dma_exit = dw_spi_dma_exit, + .dma_setup = dw_spi_dma_setup, + .can_dma = dw_spi_can_dma, + .dma_transfer = dw_spi_dma_transfer, + .dma_stop = dw_spi_dma_stop, }; -void dw_spi_mid_setup_dma_generic(struct dw_spi *dws) +void dw_spi_dma_setup_generic(struct dw_spi *dws) { - dws->dma_ops = &generic_dma_ops; + dws->dma_ops = &dw_spi_dma_generic_ops; } -EXPORT_SYMBOL_GPL(dw_spi_mid_setup_dma_generic); +EXPORT_SYMBOL_GPL(dw_spi_dma_setup_generic); diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c index c13707b8493e..2ea73809ca34 100644 --- a/drivers/spi/spi-dw-pci.c +++ b/drivers/spi/spi-dw-pci.c @@ -51,7 +51,7 @@ static int spi_mid_init(struct dw_spi *dws) /* Register hook to configure CTRLR0 */ dws->update_cr0 = dw_spi_update_cr0; - dw_spi_mid_setup_dma_mfld(dws); + dw_spi_dma_setup_mfld(dws); return 0; } @@ -61,7 +61,7 @@ static int spi_generic_init(struct dw_spi *dws) /* Register hook to configure CTRLR0 */ dws->update_cr0 = dw_spi_update_cr0; - dw_spi_mid_setup_dma_generic(dws); + dw_spi_dma_setup_generic(dws); return 0; } diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 91608cf12636..0b2cd7994513 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -259,13 +259,13 @@ extern u32 dw_spi_update_cr0_v1_01a(struct spi_controller *master, #ifdef CONFIG_SPI_DW_DMA -extern void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws); -extern void dw_spi_mid_setup_dma_generic(struct dw_spi *dws); +extern void dw_spi_dma_setup_mfld(struct dw_spi *dws); +extern void dw_spi_dma_setup_generic(struct dw_spi *dws); #else -static inline void dw_spi_mid_setup_dma_mfld(struct dw_spi *dws) {} -static inline void dw_spi_mid_setup_dma_generic(struct dw_spi *dws) {} +static inline void dw_spi_dma_setup_mfld(struct dw_spi *dws) {} +static inline void dw_spi_dma_setup_generic(struct dw_spi *dws) {} #endif /* !CONFIG_SPI_DW_DMA */ From patchwork Fri May 29 03:59:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577675 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 918E014F6 for ; Fri, 29 May 2020 04:00:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 82F22207D3 for ; Fri, 29 May 2020 04:00:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726410AbgE2EAQ (ORCPT ); Fri, 29 May 2020 00:00:16 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45454 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389554AbgE2D7o (ORCPT ); Thu, 28 May 2020 23:59:44 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id C1F7380307FF; Fri, 29 May 2020 03:59:41 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id R4VWMaS-5HKG; Fri, 29 May 2020 06:59:41 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Andy Shevchenko , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 14/16] spi: dw: Add DMA support to the DW SPI MMIO driver Date: Fri, 29 May 2020 06:59:12 +0300 Message-ID: <20200529035915.20790-15-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Since the common code in the spi-dw-dma.c driver is ready to be used by the MMIO driver and now provides a method to generically (on any DT or ACPI-based platforms) retrieve the Tx/Rx DMA channel handlers, we can use it and a set of the common DW SPI DMA callbacks to enable DMA at least for generic "snps,dw-apb-ssi" and "snps,dwc-ssi-1.01a" devices. Co-developed-by: Georgy Vlasov Signed-off-by: Georgy Vlasov Co-developed-by: Ramil Zaripov Signed-off-by: Ramil Zaripov Signed-off-by: Serge Semin Reviewed-by: Andy Shevchenko Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- drivers/spi/spi-dw-mmio.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c index 0894b4c09496..e23d0c53a664 100644 --- a/drivers/spi/spi-dw-mmio.c +++ b/drivers/spi/spi-dw-mmio.c @@ -149,6 +149,8 @@ static int dw_spi_dw_apb_init(struct platform_device *pdev, /* Register hook to configure CTRLR0 */ dwsmmio->dws.update_cr0 = dw_spi_update_cr0; + dw_spi_dma_setup_generic(&dwsmmio->dws); + return 0; } @@ -158,6 +160,8 @@ static int dw_spi_dwc_ssi_init(struct platform_device *pdev, /* Register hook to configure CTRLR0 */ dwsmmio->dws.update_cr0 = dw_spi_update_cr0_v1_01a; + dw_spi_dma_setup_generic(&dwsmmio->dws); + return 0; } From patchwork Fri May 29 03:59:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577679 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 08505139A for ; Fri, 29 May 2020 04:00:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2B742074D for ; Fri, 29 May 2020 04:00:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726068AbgE2EAP (ORCPT ); Fri, 29 May 2020 00:00:15 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45410 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389579AbgE2D7o (ORCPT ); Thu, 28 May 2020 23:59:44 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id B29FE8029EA1; Fri, 29 May 2020 03:59:42 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W0w-AkINMplP; Fri, 29 May 2020 06:59:42 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Andy Shevchenko , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Feng Tang , Rob Herring , , , , Subject: [PATCH v5 15/16] spi: dw: Use regset32 DebugFS method to create regdump file Date: Fri, 29 May 2020 06:59:13 +0300 Message-ID: <20200529035915.20790-16-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org DebugFS kernel interface provides a dedicated method to create the registers dump file. Use it instead of creating a generic DebugFS file with manually written read callback function. Signed-off-by: Serge Semin Reviewed-by: Andy Shevchenko Cc: Georgy Vlasov Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v3: - Add commas in the debugfs_reg32 structure initializer and after the last item of the array dw_spi_dbgfs_regs. --- drivers/spi/spi-dw-core.c | 86 ++++++++++++--------------------------- drivers/spi/spi-dw.h | 2 + 2 files changed, 28 insertions(+), 60 deletions(-) diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c index 4d1849699a12..323c66c5db50 100644 --- a/drivers/spi/spi-dw-core.c +++ b/drivers/spi/spi-dw-core.c @@ -29,66 +29,29 @@ struct chip_data { }; #ifdef CONFIG_DEBUG_FS -#define SPI_REGS_BUFSIZE 1024 -static ssize_t dw_spi_show_regs(struct file *file, char __user *user_buf, - size_t count, loff_t *ppos) -{ - struct dw_spi *dws = file->private_data; - char *buf; - u32 len = 0; - ssize_t ret; - - buf = kzalloc(SPI_REGS_BUFSIZE, GFP_KERNEL); - if (!buf) - return 0; - - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "%s registers:\n", dev_name(&dws->master->dev)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "=================================\n"); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "CTRLR0: \t0x%08x\n", dw_readl(dws, DW_SPI_CTRLR0)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "CTRLR1: \t0x%08x\n", dw_readl(dws, DW_SPI_CTRLR1)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "SSIENR: \t0x%08x\n", dw_readl(dws, DW_SPI_SSIENR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "SER: \t\t0x%08x\n", dw_readl(dws, DW_SPI_SER)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "BAUDR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_BAUDR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "TXFTLR: \t0x%08x\n", dw_readl(dws, DW_SPI_TXFTLR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "RXFTLR: \t0x%08x\n", dw_readl(dws, DW_SPI_RXFTLR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "TXFLR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_TXFLR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "RXFLR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_RXFLR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "SR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_SR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "IMR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_IMR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "ISR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_ISR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "DMACR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_DMACR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "DMATDLR: \t0x%08x\n", dw_readl(dws, DW_SPI_DMATDLR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "DMARDLR: \t0x%08x\n", dw_readl(dws, DW_SPI_DMARDLR)); - len += scnprintf(buf + len, SPI_REGS_BUFSIZE - len, - "=================================\n"); - - ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); - kfree(buf); - return ret; + +#define DW_SPI_DBGFS_REG(_name, _off) \ +{ \ + .name = _name, \ + .offset = _off, \ } -static const struct file_operations dw_spi_regs_ops = { - .owner = THIS_MODULE, - .open = simple_open, - .read = dw_spi_show_regs, - .llseek = default_llseek, +static const struct debugfs_reg32 dw_spi_dbgfs_regs[] = { + DW_SPI_DBGFS_REG("CTRLR0", DW_SPI_CTRLR0), + DW_SPI_DBGFS_REG("CTRLR1", DW_SPI_CTRLR1), + DW_SPI_DBGFS_REG("SSIENR", DW_SPI_SSIENR), + DW_SPI_DBGFS_REG("SER", DW_SPI_SER), + DW_SPI_DBGFS_REG("BAUDR", DW_SPI_BAUDR), + DW_SPI_DBGFS_REG("TXFTLR", DW_SPI_TXFTLR), + DW_SPI_DBGFS_REG("RXFTLR", DW_SPI_RXFTLR), + DW_SPI_DBGFS_REG("TXFLR", DW_SPI_TXFLR), + DW_SPI_DBGFS_REG("RXFLR", DW_SPI_RXFLR), + DW_SPI_DBGFS_REG("SR", DW_SPI_SR), + DW_SPI_DBGFS_REG("IMR", DW_SPI_IMR), + DW_SPI_DBGFS_REG("ISR", DW_SPI_ISR), + DW_SPI_DBGFS_REG("DMACR", DW_SPI_DMACR), + DW_SPI_DBGFS_REG("DMATDLR", DW_SPI_DMATDLR), + DW_SPI_DBGFS_REG("DMARDLR", DW_SPI_DMARDLR), }; static int dw_spi_debugfs_init(struct dw_spi *dws) @@ -100,8 +63,11 @@ static int dw_spi_debugfs_init(struct dw_spi *dws) if (!dws->debugfs) return -ENOMEM; - debugfs_create_file("registers", S_IFREG | S_IRUGO, - dws->debugfs, (void *)dws, &dw_spi_regs_ops); + dws->regset.regs = dw_spi_dbgfs_regs; + dws->regset.nregs = ARRAY_SIZE(dw_spi_dbgfs_regs); + dws->regset.base = dws->regs; + debugfs_create_regset32("registers", 0400, dws->debugfs, &dws->regset); + return 0; } diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 0b2cd7994513..151ba316619e 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -3,6 +3,7 @@ #define DW_SPI_HEADER_H #include +#include #include #include #include @@ -152,6 +153,7 @@ struct dw_spi { #ifdef CONFIG_DEBUG_FS struct dentry *debugfs; + struct debugfs_regset32 regset; #endif }; From patchwork Fri May 29 03:59:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11577669 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9F4A413B4 for ; Fri, 29 May 2020 04:00:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8680820707 for ; Fri, 29 May 2020 04:00:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726052AbgE2EAP (ORCPT ); Fri, 29 May 2020 00:00:15 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:45546 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390494AbgE2D7t (ORCPT ); Thu, 28 May 2020 23:59:49 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 465288029FF9; Fri, 29 May 2020 03:59:44 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hKH9JEXRrGol; Fri, 29 May 2020 06:59:43 +0300 (MSK) From: Serge Semin To: Mark Brown , Rob Herring CC: Serge Semin , Serge Semin , Rob Herring , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Feng Tang , Andy Shevchenko , Arnd Bergmann , , , , Subject: [PATCH v5 16/16] dt-bindings: spi: Convert DW SPI binding to DT schema Date: Fri, 29 May 2020 06:59:14 +0300 Message-ID: <20200529035915.20790-17-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> References: <20200529035915.20790-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Modern device tree bindings are supposed to be created as YAML-files in accordance with dt-schema. This commit replaces two DW SPI legacy bare text bindings with YAML file. As before the bindings file states that the corresponding dts node is supposed to be compatible either with generic DW APB SSI controller or with Microsemi/Amazon/Renesas/Intel vendors-specific controllers, to have registers, interrupts and clocks properties. Though in case of Microsemi version of the controller there must be two registers resources specified. Properties like clock-names, reg-io-width, cs-gpio, num-cs, DMA and slave device sub-nodes are optional. Signed-off-by: Serge Semin Reviewed-by: Rob Herring Cc: Georgy Vlasov Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Feng Tang Cc: Andy Shevchenko Cc: Arnd Bergmann Cc: linux-mips@vger.kernel.org --- .../bindings/spi/snps,dw-apb-ssi.txt | 44 ------ .../bindings/spi/snps,dw-apb-ssi.yaml | 127 ++++++++++++++++++ .../devicetree/bindings/spi/spi-dw.txt | 24 ---- 3 files changed, 127 insertions(+), 68 deletions(-) delete mode 100644 Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt create mode 100644 Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml delete mode 100644 Documentation/devicetree/bindings/spi/spi-dw.txt diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt deleted file mode 100644 index 020e3168ee41..000000000000 --- a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt +++ /dev/null @@ -1,44 +0,0 @@ -Synopsys DesignWare AMBA 2.0 Synchronous Serial Interface. - -Required properties: -- compatible : "snps,dw-apb-ssi" or "mscc,-spi", where soc is "ocelot" or - "jaguar2", or "amazon,alpine-dw-apb-ssi", or "snps,dwc-ssi-1.01a" or - "intel,keembay-ssi" -- reg : The register base for the controller. For "mscc,-spi", a second - register set is required (named ICPU_CFG:SPI_MST) -- interrupts : One interrupt, used by the controller. -- #address-cells : <1>, as required by generic SPI binding. -- #size-cells : <0>, also as required by generic SPI binding. -- clocks : phandles for the clocks, see the description of clock-names below. - The phandle for the "ssi_clk" is required. The phandle for the "pclk" clock - is optional. If a single clock is specified but no clock-name, it is the - "ssi_clk" clock. If both clocks are listed, the "ssi_clk" must be first. - -Optional properties: -- clock-names : Contains the names of the clocks: - "ssi_clk", for the core clock used to generate the external SPI clock. - "pclk", the interface clock, required for register access. If a clock domain - used to enable this clock then it should be named "pclk_clkdomain". -- cs-gpios : Specifies the gpio pins to be used for chipselects. -- num-cs : The number of chipselects. If omitted, this will default to 4. -- reg-io-width : The I/O register width (in bytes) implemented by this - device. Supported values are 2 or 4 (the default). -- dmas : Phandle + identifiers of Tx and Rx DMA channels. -- dma-names : Contains the names of the DMA channels. Must be "tx" and "rx". - -Child nodes as per the generic SPI binding. - -Example: - - spi@fff00000 { - compatible = "snps,dw-apb-ssi"; - reg = <0xfff00000 0x1000>; - interrupts = <0 154 4>; - #address-cells = <1>; - #size-cells = <0>; - clocks = <&spi_m_clk>; - num-cs = <2>; - cs-gpios = <&gpio0 13 0>, - <&gpio0 14 0>; - }; - diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml new file mode 100644 index 000000000000..1fcab6415136 --- /dev/null +++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml @@ -0,0 +1,127 @@ +# SPDX-License-Identifier: GPL-2.0-only +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/spi/snps,dw-apb-ssi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Synopsys DesignWare AMBA 2.0 Synchronous Serial Interface + +maintainers: + - Mark Brown + +allOf: + - $ref: "spi-controller.yaml#" + - if: + properties: + compatible: + contains: + enum: + - mscc,ocelot-spi + - mscc,jaguar2-spi + then: + properties: + reg: + minItems: 2 + +properties: + compatible: + oneOf: + - description: Generic DW SPI Controller + enum: + - snps,dw-apb-ssi + - snps,dwc-ssi-1.01a + - description: Microsemi Ocelot/Jaguar2 SoC SPI Controller + items: + - enum: + - mscc,ocelot-spi + - mscc,jaguar2-spi + - const: snps,dw-apb-ssi + - description: Amazon Alpine SPI Controller + const: amazon,alpine-dw-apb-ssi + - description: Renesas RZ/N1 SPI Controller + items: + - const: renesas,rzn1-spi + - const: snps,dw-apb-ssi + - description: Intel Keem Bay SPI Controller + const: intel,keembay-ssi + + reg: + minItems: 1 + items: + - description: DW APB SSI controller memory mapped registers + - description: SPI MST region map + + interrupts: + maxItems: 1 + + clocks: + minItems: 1 + items: + - description: SPI Controller reference clock source + - description: APB interface clock source + + clock-names: + minItems: 1 + items: + - const: ssi_clk + - const: pclk + + reg-io-width: + $ref: /schemas/types.yaml#/definitions/uint32 + description: I/O register width (in bytes) implemented by this device + default: 4 + enum: [ 2, 4 ] + + num-cs: + default: 4 + minimum: 1 + maximum: 4 + + dmas: + items: + - description: TX DMA Channel + - description: RX DMA Channel + + dma-names: + items: + - const: tx + - const: rx + +patternProperties: + "^.*@[0-9a-f]+$": + type: object + properties: + reg: + minimum: 0 + maximum: 3 + + spi-rx-bus-width: + const: 1 + + spi-tx-bus-width: + const: 1 + +unevaluatedProperties: false + +required: + - compatible + - reg + - "#address-cells" + - "#size-cells" + - interrupts + - clocks + +examples: + - | + spi@fff00000 { + compatible = "snps,dw-apb-ssi"; + reg = <0xfff00000 0x1000>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = <0 154 4>; + clocks = <&spi_m_clk>; + num-cs = <2>; + cs-gpios = <&gpio0 13 0>, + <&gpio0 14 0>; + }; +... diff --git a/Documentation/devicetree/bindings/spi/spi-dw.txt b/Documentation/devicetree/bindings/spi/spi-dw.txt deleted file mode 100644 index 7b63ed601990..000000000000 --- a/Documentation/devicetree/bindings/spi/spi-dw.txt +++ /dev/null @@ -1,24 +0,0 @@ -Synopsys DesignWare SPI master - -Required properties: -- compatible: should be "snps,designware-spi" -- #address-cells: see spi-bus.txt -- #size-cells: see spi-bus.txt -- reg: address and length of the spi master registers -- interrupts: should contain one interrupt -- clocks: spi clock phandle -- num-cs: see spi-bus.txt - -Optional properties: -- cs-gpios: see spi-bus.txt - -Example: - -spi: spi@4020a000 { - compatible = "snps,designware-spi"; - interrupts = <11 1>; - reg = <0x4020a000 0x1000>; - clocks = <&pclk>; - num-cs = <2>; - cs-gpios = <&banka 0 0>; -};