From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752538AbbHSDiq (ORCPT ); Tue, 18 Aug 2015 23:38:46 -0400 Received: from mailgw01.mediatek.com ([210.61.82.183]:42815 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752175AbbHSDik (ORCPT ); Tue, 18 Aug 2015 23:38:40 -0400 X-Listener-Flag: 11101 From: Leilk Liu To: Mark Brown CC: Mark Rutland , Matthias Brugger , Sascha Hauer , , , , , , Leilk Liu Subject: [PATCH 3/3] spi: mediatek: fix spi incorrect endian usage Date: Wed, 19 Aug 2015 11:37:58 +0800 Message-ID: <1439955478-2733-4-git-send-email-leilk.liu@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1439955478-2733-1-git-send-email-leilk.liu@mediatek.com> References: <1439955478-2733-1-git-send-email-leilk.liu@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org TX_ENDIAN/RX_ENDIAN bits define whether to reverse the endian order of the data DMA from/to memory. The endian order should keep the same with cpu endian. Signed-off-by: Leilk Liu --- drivers/spi/spi-mt65xx.c | 43 ++++++++++++-------------------- include/linux/platform_data/spi-mt65xx.h | 2 -- 2 files changed, 16 insertions(+), 29 deletions(-) diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c index 1c2b215..eaadc7e 100644 --- a/drivers/spi/spi-mt65xx.c +++ b/drivers/spi/spi-mt65xx.c @@ -107,8 +107,6 @@ static const struct mtk_spi_compatible mt8173_compat = { static const struct mtk_chip_config mtk_default_chip_info = { .rx_mlsb = 1, .tx_mlsb = 1, - .tx_endian = 0, - .rx_endian = 0, }; static const struct of_device_id mtk_spi_of_match[] = { @@ -151,14 +149,13 @@ static void mtk_spi_config(struct mtk_spi *mdata, reg_val &= ~SPI_CMD_RXMSBF; /* set the tx/rx endian */ - if (chip_config->tx_endian) - reg_val |= SPI_CMD_TX_ENDIAN; - else - reg_val &= ~SPI_CMD_TX_ENDIAN; - if (chip_config->rx_endian) - reg_val |= SPI_CMD_RX_ENDIAN; - else - reg_val &= ~SPI_CMD_RX_ENDIAN; +#ifdef __LITTLE_ENDIAN + reg_val &= ~SPI_CMD_TX_ENDIAN; + reg_val &= ~SPI_CMD_RX_ENDIAN; +#else + reg_val |= SPI_CMD_TX_ENDIAN; + reg_val |= SPI_CMD_RX_ENDIAN; +#endif /* set finish and pause interrupt always enable */ reg_val |= SPI_CMD_FINISH_IE | SPI_CMD_PAUSE_EN; @@ -348,7 +345,7 @@ static int mtk_spi_fifo_transfer(struct spi_master *master, struct spi_device *spi, struct spi_transfer *xfer) { - int cnt, i; + int cnt; struct mtk_spi *mdata = spi_master_get_devdata(master); mdata->cur_transfer = xfer; @@ -360,10 +357,7 @@ static int mtk_spi_fifo_transfer(struct spi_master *master, cnt = xfer->len / 4 + 1; else cnt = xfer->len / 4; - - for (i = 0; i < cnt; i++) - writel(*((u32 *)xfer->tx_buf + i), - mdata->base + SPI_TX_DATA_REG); + iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt); mtk_spi_enable_transfer(master); @@ -433,7 +427,7 @@ static bool mtk_spi_can_dma(struct spi_master *master, static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id) { - u32 cmd, reg_val, i; + u32 cmd, reg_val, cnt; struct spi_master *master = dev_id; struct mtk_spi *mdata = spi_master_get_devdata(master); struct spi_transfer *trans = mdata->cur_transfer; @@ -445,18 +439,13 @@ static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id) mdata->state = MTK_SPI_IDLE; if (!master->can_dma(master, master->cur_msg->spi, trans)) { - /* xfer len is not N*4 bytes every time in a transfer, - * but SPI_RX_DATA_REG must reads 4 bytes once, - * so rx buffer byte by byte. - */ if (trans->rx_buf) { - for (i = 0; i < mdata->xfer_len; i++) { - if (i % 4 == 0) - reg_val = - readl(mdata->base + SPI_RX_DATA_REG); - *((u8 *)(trans->rx_buf + i)) = - (reg_val >> ((i % 4) * 8)) & 0xff; - } + if (mdata->xfer_len % 4) + cnt = mdata->xfer_len / 4 + 1; + else + cnt = mdata->xfer_len / 4; + ioread32_rep(mdata->base + SPI_RX_DATA_REG, + trans->rx_buf, cnt); } spi_finalize_current_transfer(master); return IRQ_HANDLED; diff --git a/include/linux/platform_data/spi-mt65xx.h b/include/linux/platform_data/spi-mt65xx.h index 7512255..54b0448 100644 --- a/include/linux/platform_data/spi-mt65xx.h +++ b/include/linux/platform_data/spi-mt65xx.h @@ -16,7 +16,5 @@ struct mtk_chip_config { u32 tx_mlsb; u32 rx_mlsb; - u32 tx_endian; - u32 rx_endian; }; #endif -- 1.8.1.1.dirty