From patchwork Fri Apr 1 07:16:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leilk Liu X-Patchwork-Id: 12797956 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id ADEA5C433F5 for ; Fri, 1 Apr 2022 07:18:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=EJU1jnmW8gRmNfLMKyv/4Werp+ee/R2H+p6ZYC9updo=; b=wuC70dnqIT0AAH XjK+d7OGFLxg74wURG5cZYnA6CLoPym6WSPK0St5YrZ8UfoTm4uu/OLgePscwflC7vawKUUGaNuT1 1/sW0CRP9mU49W1wZt5/VUWZoBlX2ObI0YaLpgsfad9WN4gxEOhwXsRKF3ky/Bu4a4+fmt402ODpg 4HmpH8cd6xuxVC5+DA537kyhwd+FMYiRTX0SgsAXIHrl8FkPyBw7psEe1uzzLMhuNFRTDaWOgo5dH nkCjPWbpjdjqSo42RLdx5dlw6ahUiSS6DfDTcSXIqPKYYaitvmIPpmpPtjfLpVmHqHwl0KIE64weo Tfom9iFtUaJXQBv1+gZg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1naBWy-004khf-Jg; Fri, 01 Apr 2022 07:17:12 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1naBWT-004kVA-Vp; Fri, 01 Apr 2022 07:16:43 +0000 X-UUID: d9994dd626de4ab99a74e05d23041e4b-20220401 X-UUID: d9994dd626de4ab99a74e05d23041e4b-20220401 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 352152534; Fri, 01 Apr 2022 00:16:30 -0700 Received: from mtkexhb01.mediatek.inc (172.21.101.102) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 1 Apr 2022 00:16:29 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkexhb01.mediatek.inc (172.21.101.102) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 1 Apr 2022 15:16:21 +0800 Received: from localhost.localdomain (10.17.3.154) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 1 Apr 2022 15:16:21 +0800 From: Leilk Liu To: Mark Brown CC: Rob Herring , Matthias Brugger , , , , , , Leilk Liu , AngeloGioacchino Del Regno Subject: [PATCH V7 1/3] spi: mediatek: add spi memory support for ipm design Date: Fri, 1 Apr 2022 15:16:14 +0800 Message-ID: <20220401071616.8874-2-leilk.liu@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220401071616.8874-1-leilk.liu@mediatek.com> References: <20220401071616.8874-1-leilk.liu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220401_001642_052328_F4D1C120 X-CRM114-Status: GOOD ( 27.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org this patch add the support of spi-mem for ipm design. Signed-off-by: Leilk Liu Reviewed-by: AngeloGioacchino Del Regno --- drivers/spi/spi-mt65xx.c | 301 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 300 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c index 1a0b3208dfca..0f91c176b878 100644 --- a/drivers/spi/spi-mt65xx.c +++ b/drivers/spi/spi-mt65xx.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #define SPI_CFG0_REG 0x0000 @@ -78,8 +79,20 @@ #define SPI_CMD_IPM_GET_TICKDLY_OFFSET 22 #define SPI_CMD_IPM_GET_TICKDLY_MASK GENMASK(24, 22) + +#define PIN_MODE_CFG(x) ((x) / 2) + #define SPI_CFG3_IPM_HALF_DUPLEX_DIR BIT(2) #define SPI_CFG3_IPM_HALF_DUPLEX_EN BIT(3) +#define SPI_CFG3_IPM_XMODE_EN BIT(4) +#define SPI_CFG3_IPM_NODATA_FLAG BIT(5) +#define SPI_CFG3_IPM_CMD_BYTELEN_OFFSET 8 +#define SPI_CFG3_IPM_ADDR_BYTELEN_OFFSET 12 + +#define SPI_CFG3_IPM_CMD_PIN_MODE_MASK GENMASK(1, 0) +#define SPI_CFG3_IPM_CMD_BYTELEN_MASK GENMASK(11, 8) +#define SPI_CFG3_IPM_ADDR_BYTELEN_MASK GENMASK(15, 12) + #define MT8173_SPI_MAX_PAD_SEL 3 #define MTK_SPI_PAUSE_INT_STATUS 0x2 @@ -90,6 +103,8 @@ #define MTK_SPI_MAX_FIFO_SIZE 32U #define MTK_SPI_PACKET_SIZE 1024 #define MTK_SPI_IPM_PACKET_SIZE SZ_64K +#define MTK_SPI_IPM_PACKET_LOOP SZ_256 + #define MTK_SPI_32BITS_MASK (0xffffffff) #define DMA_ADDR_EXT_BITS (36) @@ -107,7 +122,6 @@ struct mtk_spi_compatible { bool no_need_unprepare; /* IPM design adjust and extend register to support more features */ bool ipm_design; - }; struct mtk_spi { @@ -123,6 +137,11 @@ struct mtk_spi { u32 tx_sgl_len, rx_sgl_len; const struct mtk_spi_compatible *dev_comp; u32 spi_clk_hz; + struct completion spimem_done; + bool use_spimem; + struct device *dev; + dma_addr_t tx_dma; + dma_addr_t rx_dma; }; static const struct mtk_spi_compatible mtk_common_compat; @@ -704,6 +723,12 @@ static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id) else mdata->state = MTK_SPI_IDLE; + /* SPI-MEM ops */ + if (mdata->use_spimem) { + complete(&mdata->spimem_done); + return IRQ_HANDLED; + } + if (!master->can_dma(master, NULL, trans)) { if (trans->rx_buf) { cnt = mdata->xfer_len / 4; @@ -787,6 +812,274 @@ static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +static int mtk_spi_mem_adjust_op_size(struct spi_mem *mem, + struct spi_mem_op *op) +{ + int opcode_len; + + if (op->data.dir != SPI_MEM_NO_DATA) { + opcode_len = 1 + op->addr.nbytes + op->dummy.nbytes; + if (opcode_len + op->data.nbytes > MTK_SPI_IPM_PACKET_SIZE) { + op->data.nbytes = MTK_SPI_IPM_PACKET_SIZE - opcode_len; + /* force data buffer dma-aligned. */ + op->data.nbytes -= op->data.nbytes % 4; + } + } + + return 0; +} + +static bool mtk_spi_mem_supports_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + if (!spi_mem_default_supports_op(mem, op)) + return false; + + if (op->addr.nbytes && op->dummy.nbytes && + op->addr.buswidth != op->dummy.buswidth) + return false; + + if (op->addr.nbytes + op->dummy.nbytes > 16) + return false; + + if (op->data.nbytes > MTK_SPI_IPM_PACKET_SIZE) { + if (op->data.nbytes / MTK_SPI_IPM_PACKET_SIZE > + MTK_SPI_IPM_PACKET_LOOP || + op->data.nbytes % MTK_SPI_IPM_PACKET_SIZE != 0) + return false; + } + + return true; +} + +static void mtk_spi_mem_setup_dma_xfer(struct spi_master *master, + const struct spi_mem_op *op) +{ + struct mtk_spi *mdata = spi_master_get_devdata(master); + + writel((u32)(mdata->tx_dma & MTK_SPI_32BITS_MASK), + mdata->base + SPI_TX_SRC_REG); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (mdata->dev_comp->dma_ext) + writel((u32)(mdata->tx_dma >> 32), + mdata->base + SPI_TX_SRC_REG_64); +#endif + + if (op->data.dir == SPI_MEM_DATA_IN) { + writel((u32)(mdata->rx_dma & MTK_SPI_32BITS_MASK), + mdata->base + SPI_RX_DST_REG); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (mdata->dev_comp->dma_ext) + writel((u32)(mdata->rx_dma >> 32), + mdata->base + SPI_RX_DST_REG_64); +#endif + } +} + +static int mtk_spi_transfer_wait(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct mtk_spi *mdata = spi_master_get_devdata(mem->spi->master); + /* + * For each byte we wait for 8 cycles of the SPI clock. + * Since speed is defined in Hz and we want milliseconds, + * so it should be 8 * 1000. + */ + u64 ms = 8000LL; + + if (op->data.dir == SPI_MEM_NO_DATA) + ms *= 32; /* prevent we may get 0 for short transfers. */ + else + ms *= op->data.nbytes; + ms = div_u64(ms, mem->spi->max_speed_hz); + ms += ms + 1000; /* 1s tolerance */ + + if (ms > UINT_MAX) + ms = UINT_MAX; + + if (!wait_for_completion_timeout(&mdata->spimem_done, + msecs_to_jiffies(ms))) { + dev_err(mdata->dev, "spi-mem transfer timeout\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int mtk_spi_mem_exec_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct mtk_spi *mdata = spi_master_get_devdata(mem->spi->master); + u32 reg_val, nio, tx_size; + char *tx_tmp_buf, *rx_tmp_buf; + int ret = 0; + + mdata->use_spimem = true; + reinit_completion(&mdata->spimem_done); + + mtk_spi_reset(mdata); + mtk_spi_hw_init(mem->spi->master, mem->spi); + mtk_spi_prepare_transfer(mem->spi->master, mem->spi->max_speed_hz); + + reg_val = readl(mdata->base + SPI_CFG3_IPM_REG); + /* opcode byte len */ + reg_val &= ~SPI_CFG3_IPM_CMD_BYTELEN_MASK; + reg_val |= 1 << SPI_CFG3_IPM_CMD_BYTELEN_OFFSET; + + /* addr & dummy byte len */ + reg_val &= ~SPI_CFG3_IPM_ADDR_BYTELEN_MASK; + if (op->addr.nbytes || op->dummy.nbytes) + reg_val |= (op->addr.nbytes + op->dummy.nbytes) << + SPI_CFG3_IPM_ADDR_BYTELEN_OFFSET; + + /* data byte len */ + if (op->data.dir == SPI_MEM_NO_DATA) { + reg_val |= SPI_CFG3_IPM_NODATA_FLAG; + writel(0, mdata->base + SPI_CFG1_REG); + } else { + reg_val &= ~SPI_CFG3_IPM_NODATA_FLAG; + mdata->xfer_len = op->data.nbytes; + mtk_spi_setup_packet(mem->spi->master); + } + + if (op->addr.nbytes || op->dummy.nbytes) { + if (op->addr.buswidth == 1 || op->dummy.buswidth == 1) + reg_val |= SPI_CFG3_IPM_XMODE_EN; + else + reg_val &= ~SPI_CFG3_IPM_XMODE_EN; + } + + if (op->addr.buswidth == 2 || + op->dummy.buswidth == 2 || + op->data.buswidth == 2) + nio = 2; + else if (op->addr.buswidth == 4 || + op->dummy.buswidth == 4 || + op->data.buswidth == 4) + nio = 4; + else + nio = 1; + + reg_val &= ~SPI_CFG3_IPM_CMD_PIN_MODE_MASK; + reg_val |= PIN_MODE_CFG(nio); + + reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_EN; + if (op->data.dir == SPI_MEM_DATA_IN) + reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_DIR; + else + reg_val &= ~SPI_CFG3_IPM_HALF_DUPLEX_DIR; + writel(reg_val, mdata->base + SPI_CFG3_IPM_REG); + + tx_size = 1 + op->addr.nbytes + op->dummy.nbytes; + if (op->data.dir == SPI_MEM_DATA_OUT) + tx_size += op->data.nbytes; + + tx_size = max_t(u32, tx_size, 32); + + tx_tmp_buf = kzalloc(tx_size, GFP_KERNEL | GFP_DMA); + if (!tx_tmp_buf) { + mdata->use_spimem = false; + return -ENOMEM; + } + + tx_tmp_buf[0] = op->cmd.opcode; + + if (op->addr.nbytes) { + int i; + + for (i = 0; i < op->addr.nbytes; i++) + tx_tmp_buf[i + 1] = op->addr.val >> + (8 * (op->addr.nbytes - i - 1)); + } + + if (op->dummy.nbytes) + memset(tx_tmp_buf + op->addr.nbytes + 1, + 0xff, + op->dummy.nbytes); + + if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT) + memcpy(tx_tmp_buf + op->dummy.nbytes + op->addr.nbytes + 1, + op->data.buf.out, + op->data.nbytes); + + mdata->tx_dma = dma_map_single(mdata->dev, tx_tmp_buf, + tx_size, DMA_TO_DEVICE); + if (dma_mapping_error(mdata->dev, mdata->tx_dma)) { + ret = -ENOMEM; + goto err_exit; + } + + if (op->data.dir == SPI_MEM_DATA_IN) { + if (!IS_ALIGNED((size_t)op->data.buf.in, 4)) { + rx_tmp_buf = kzalloc(op->data.nbytes, + GFP_KERNEL | GFP_DMA); + if (!rx_tmp_buf) { + ret = -ENOMEM; + goto unmap_tx_dma; + } + } else { + rx_tmp_buf = op->data.buf.in; + } + + mdata->rx_dma = dma_map_single(mdata->dev, + rx_tmp_buf, + op->data.nbytes, + DMA_FROM_DEVICE); + if (dma_mapping_error(mdata->dev, mdata->rx_dma)) { + ret = -ENOMEM; + goto kfree_rx_tmp_buf; + } + } + + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val |= SPI_CMD_TX_DMA; + if (op->data.dir == SPI_MEM_DATA_IN) + reg_val |= SPI_CMD_RX_DMA; + writel(reg_val, mdata->base + SPI_CMD_REG); + + mtk_spi_mem_setup_dma_xfer(mem->spi->master, op); + + mtk_spi_enable_transfer(mem->spi->master); + + /* Wait for the interrupt. */ + ret = mtk_spi_transfer_wait(mem, op); + if (ret) + goto unmap_rx_dma; + + /* spi disable dma */ + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val &= ~SPI_CMD_TX_DMA; + if (op->data.dir == SPI_MEM_DATA_IN) + reg_val &= ~SPI_CMD_RX_DMA; + writel(reg_val, mdata->base + SPI_CMD_REG); + +unmap_rx_dma: + if (op->data.dir == SPI_MEM_DATA_IN) { + dma_unmap_single(mdata->dev, mdata->rx_dma, + op->data.nbytes, DMA_FROM_DEVICE); + if (!IS_ALIGNED((size_t)op->data.buf.in, 4)) + memcpy(op->data.buf.in, rx_tmp_buf, op->data.nbytes); + } +kfree_rx_tmp_buf: + if (op->data.dir == SPI_MEM_DATA_IN && + !IS_ALIGNED((size_t)op->data.buf.in, 4)) + kfree(rx_tmp_buf); +unmap_tx_dma: + dma_unmap_single(mdata->dev, mdata->tx_dma, + tx_size, DMA_TO_DEVICE); +err_exit: + kfree(tx_tmp_buf); + mdata->use_spimem = false; + + return ret; +} + +static const struct spi_controller_mem_ops mtk_spi_mem_ops = { + .adjust_op_size = mtk_spi_mem_adjust_op_size, + .supports_op = mtk_spi_mem_supports_op, + .exec_op = mtk_spi_mem_exec_op, +}; + static int mtk_spi_probe(struct platform_device *pdev) { struct spi_master *master; @@ -830,6 +1123,12 @@ static int mtk_spi_probe(struct platform_device *pdev) if (mdata->dev_comp->ipm_design) master->mode_bits |= SPI_LOOP; + if (mdata->dev_comp->ipm_design) { + mdata->dev = &pdev->dev; + master->mem_ops = &mtk_spi_mem_ops; + init_completion(&mdata->spimem_done); + } + if (mdata->dev_comp->need_pad_sel) { mdata->pad_num = of_property_count_u32_elems( pdev->dev.of_node,