From patchwork Wed Oct 2 07:02:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Chen X-Patchwork-Id: 13819409 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 90453CF3198 for ; Wed, 2 Oct 2024 07:07:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:To:From:Reply-To:Cc:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=SfSKk+NEAJXc7P8MUzZMMqe5JT/zAcPkttoIlU97vq8=; b=4St1qpiXpI9yLLQlFXYnNEODCn oqe1TgQSftMMJeFiqhZk961CAFYobU2z5cs17O29776YguPkAUJ8tktMuouz863h3GHg7YMttTh0j O/sC+Rk//i6L0/ZjLzZn/RJ94HttnICFJJ41dkPeklGjvY22FHI09DrAe4Qm0Y5syALzYPW1QT0Rk edJjK/33JEUgIYjYfCv/RJlOMXdiIpArMTvfuvZUhMC5qdKwY9Q/cLswfh+OnfBoYIWuqz7zBTItI /TUobvoGkoyfbZIhXHqCr2luJOVt1pLPPVjZpYHq9XoBDV4RdA9ja8fj5UfX/TsZknOknsKaBRFNj 5gzlLWFA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1svtSP-0000000504I-1t6b; Wed, 02 Oct 2024 07:07:33 +0000 Received: from mail.aspeedtech.com ([211.20.114.72] helo=TWMBX01.aspeed.com) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1svtNe-00000004z9P-2s6f for linux-arm-kernel@lists.infradead.org; Wed, 02 Oct 2024 07:02:40 +0000 Received: from TWMBX01.aspeed.com (192.168.0.62) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.12; Wed, 2 Oct 2024 15:02:14 +0800 Received: from twmbx02.aspeed.com (192.168.10.152) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server id 15.2.1258.12 via Frontend Transport; Wed, 2 Oct 2024 15:02:14 +0800 From: Ryan Chen To: , , , , , , , , , , , , , , , , Subject: [PATCH v14 3/3] i2c: aspeed: support AST2600 i2c new register slave mode driver Date: Wed, 2 Oct 2024 15:02:13 +0800 Message-ID: <20241002070213.1165263-4-ryan_chen@aspeedtech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241002070213.1165263-1-ryan_chen@aspeedtech.com> References: <20241002070213.1165263-1-ryan_chen@aspeedtech.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241002_000238_768092_BA3314D8 X-CRM114-Status: GOOD ( 17.95 ) 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 is for i2c new register slave mode driver. Signed-off-by: Ryan Chen --- drivers/i2c/busses/i2c-ast2600.c | 528 +++++++++++++++++++++++++++++++ 1 file changed, 528 insertions(+) diff --git a/drivers/i2c/busses/i2c-ast2600.c b/drivers/i2c/busses/i2c-ast2600.c index 7084f2297a07..ca4ed892e4a5 100644 --- a/drivers/i2c/busses/i2c-ast2600.c +++ b/drivers/i2c/busses/i2c-ast2600.c @@ -270,6 +270,15 @@ struct ast2600_i2c_bus { /* Buffer mode */ void __iomem *buf_base; struct i2c_smbus_alert_setup alert_data; +#if IS_ENABLED(CONFIG_I2C_SLAVE) + /* Slave structure */ + int slave_operate; + int slave_xfer_len; + int slave_xfer_cnt; + unsigned char *slave_dma_buf; + dma_addr_t slave_dma_addr; + struct i2c_client *slave; +#endif }; static u32 ast2600_select_i2c_clock(struct ast2600_i2c_bus *i2c_bus) @@ -361,6 +370,388 @@ static u8 ast2600_i2c_recover_bus(struct ast2600_i2c_bus *i2c_bus) return ret; } +#if IS_ENABLED(CONFIG_I2C_SLAVE) +static void ast2600_i2c_slave_packet_dma_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + int slave_rx_len; + u32 cmd = 0; + u8 value; + int i; + + sts &= ~(AST2600_I2CS_SLAVE_PENDING); + /* Handle i2c slave timeout condition */ + if (AST2600_I2CS_INACTIVE_TO & sts) { + cmd = SLAVE_TRIGGER_CMD; + cmd |= AST2600_I2CS_RX_DMA_EN; + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_ISR); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + return; + } + + sts &= ~(AST2600_I2CS_PKT_DONE | AST2600_I2CS_PKT_ERROR); + + switch (sts) { + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA: + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_RX_DMA: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + slave_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CS_DMA_LEN_STS)); + for (i = 0; i < slave_rx_len; i++) { + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, + &i2c_bus->slave_dma_buf[i]); + } + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_STOP: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE_NAK | + AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_RX_DMA | + AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_RX_DONE_NAK | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_STOP: + case AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA: + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + if (sts & AST2600_I2CS_SLAVE_MATCH) + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + + slave_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CS_DMA_LEN_STS)); + for (i = 0; i < slave_rx_len; i++) { + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, + &i2c_bus->slave_dma_buf[i]); + } + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + if (sts & AST2600_I2CS_STOP) + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + + /* it is Mw data Mr coming -> it need send tx */ + case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_TX_DMA: + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_TX_DMA: + /* it should be repeat start read */ + if (sts & AST2600_I2CS_SLAVE_MATCH) + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + + slave_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CS_DMA_LEN_STS)); + for (i = 0; i < slave_rx_len; i++) { + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, + &i2c_bus->slave_dma_buf[i]); + } + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, + &i2c_bus->slave_dma_buf[0]); + writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS); + writel(AST2600_I2CS_SET_TX_DMA_LEN(1), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_TX_DMA: + /* First Start read */ + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, + &i2c_bus->slave_dma_buf[0]); + writel(AST2600_I2CS_SET_TX_DMA_LEN(1), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_DMA_EN; + break; + case AST2600_I2CS_WAIT_TX_DMA: + /* it should be next start read */ + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED, + &i2c_bus->slave_dma_buf[0]); + writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS); + writel(AST2600_I2CS_SET_TX_DMA_LEN(1), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_DMA_EN; + break; + case AST2600_I2CS_TX_NAK | AST2600_I2CS_STOP: + /* it just tx complete */ + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE: + cmd = 0; + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + break; + case AST2600_I2CS_STOP: + cmd = 0; + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + default: + dev_dbg(i2c_bus->dev, "unhandled slave isr case %x, sts %x\n", sts, + readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF)); + break; + } + + if (cmd) + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_ISR); + readl(i2c_bus->reg_base + AST2600_I2CS_ISR); +} + +static void ast2600_i2c_slave_packet_buff_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + int slave_rx_len = 0; + u32 cmd = 0; + u8 value; + int i; + + /* due to master slave is common buffer, so need force the master stop not issue */ + if (readl(i2c_bus->reg_base + AST2600_I2CM_CMD_STS) & GENMASK(15, 0)) { + writel(0, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + i2c_bus->cmd_err = -EBUSY; + writel(0, i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + complete(&i2c_bus->cmd_complete); + } + + /* Handle i2c slave timeout condition */ + if (AST2600_I2CS_INACTIVE_TO & sts) { + writel(SLAVE_TRIGGER_CMD, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_ISR); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + i2c_bus->slave_operate = 0; + return; + } + + sts &= ~(AST2600_I2CS_PKT_DONE | AST2600_I2CS_PKT_ERROR); + + if (sts & AST2600_I2CS_SLAVE_MATCH) + i2c_bus->slave_operate = 1; + + switch (sts) { + case AST2600_I2CS_SLAVE_PENDING | AST2600_I2CS_WAIT_RX_DMA | + AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_SLAVE_PENDING | + AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + case AST2600_I2CS_SLAVE_PENDING | + AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_STOP: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + fallthrough; + case AST2600_I2CS_SLAVE_PENDING | + AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE: + case AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE: + case AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_SLAVE_MATCH: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + cmd = SLAVE_TRIGGER_CMD; + if (sts & AST2600_I2CS_RX_DONE) { + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + } + if (readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS) & AST2600_I2CS_RX_BUFF_EN) + cmd = 0; + else + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_BUFF_EN; + + writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + break; + case AST2600_I2CS_WAIT_RX_DMA | AST2600_I2CS_RX_DONE: + cmd = SLAVE_TRIGGER_CMD; + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + cmd |= AST2600_I2CS_RX_BUFF_EN; + writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + break; + case AST2600_I2CS_SLAVE_PENDING | AST2600_I2CS_WAIT_RX_DMA | + AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + cmd = SLAVE_TRIGGER_CMD; + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + cmd |= AST2600_I2CS_RX_BUFF_EN; + writel(AST2600_I2CC_SET_RX_BUF_LEN(i2c_bus->buf_size), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + break; + case AST2600_I2CS_SLAVE_PENDING | AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + cmd = SLAVE_TRIGGER_CMD; + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + /* workaround for avoid next start with len != 0 */ + writel(BIT(0), i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + case AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + cmd = SLAVE_TRIGGER_CMD; + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + /* workaround for avoid next start with len != 0 */ + writel(BIT(0), i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + case AST2600_I2CS_WAIT_TX_DMA | AST2600_I2CS_SLAVE_MATCH: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &value); + writeb(value, i2c_bus->buf_base); + writel(AST2600_I2CC_SET_TX_BUF_LEN(1), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_BUFF_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_WAIT_TX_DMA | AST2600_I2CS_RX_DONE: + case AST2600_I2CS_WAIT_TX_DMA | AST2600_I2CS_RX_DONE: + case AST2600_I2CS_WAIT_TX_DMA: + if (sts & AST2600_I2CS_SLAVE_MATCH) + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + + if (sts & AST2600_I2CS_RX_DONE) { + slave_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < slave_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &value); + } + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &value); + } else { + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED, &value); + } + writeb(value, i2c_bus->buf_base); + writel(AST2600_I2CC_SET_TX_BUF_LEN(1), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_TX_BUFF_EN; + break; + /* workaround : trigger the cmd twice to fix next state keep 1000000 */ + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + cmd = SLAVE_TRIGGER_CMD | AST2600_I2CS_RX_BUFF_EN; + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + break; + + case AST2600_I2CS_TX_NAK | AST2600_I2CS_STOP: + case AST2600_I2CS_STOP: + cmd = SLAVE_TRIGGER_CMD; + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + default: + dev_dbg(i2c_bus->dev, "unhandled slave isr case %x, sts %x\n", sts, + readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF)); + break; + } + + if (cmd) + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_ISR); + readl(i2c_bus->reg_base + AST2600_I2CS_ISR); + + if ((sts & AST2600_I2CS_STOP) && !(sts & AST2600_I2CS_SLAVE_PENDING)) + i2c_bus->slave_operate = 0; +} + +static void ast2600_i2c_slave_byte_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + u32 i2c_buff = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + u32 cmd = AST2600_I2CS_ACTIVE_ALL; + u8 byte_data; + u8 value; + + switch (sts) { + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_REQUESTED, &value); + /* first address match is address */ + byte_data = AST2600_I2CC_GET_RX_BUFF(i2c_buff); + break; + case AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_RX_DMA: + byte_data = AST2600_I2CC_GET_RX_BUFF(i2c_buff); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_WRITE_RECEIVED, &byte_data); + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE | AST2600_I2CS_WAIT_TX_DMA: + cmd |= AST2600_I2CS_TX_CMD; + byte_data = AST2600_I2CC_GET_RX_BUFF(i2c_buff); + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_REQUESTED, &byte_data); + writel(byte_data, i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + break; + case AST2600_I2CS_TX_ACK | AST2600_I2CS_WAIT_TX_DMA: + cmd |= AST2600_I2CS_TX_CMD; + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_READ_PROCESSED, &byte_data); + writel(byte_data, i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + break; + case AST2600_I2CS_STOP: + case AST2600_I2CS_STOP | AST2600_I2CS_TX_NAK: + i2c_slave_event(i2c_bus->slave, I2C_SLAVE_STOP, &value); + break; + default: + dev_dbg(i2c_bus->dev, "unhandled pkt isr %x\n", sts); + break; + } + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(sts, i2c_bus->reg_base + AST2600_I2CS_ISR); + readl(i2c_bus->reg_base + AST2600_I2CS_ISR); +} + +static int ast2600_i2c_slave_irq(struct ast2600_i2c_bus *i2c_bus) +{ + u32 ier = readl(i2c_bus->reg_base + AST2600_I2CS_IER); + u32 isr = readl(i2c_bus->reg_base + AST2600_I2CS_ISR); + + if (!(isr & ier)) + return 0; + + /* + * Slave interrupt coming after Master package done + * So need handle master first. + */ + if (readl(i2c_bus->reg_base + AST2600_I2CM_ISR) & AST2600_I2CM_PKT_DONE) + return 0; + + isr &= ~(AST2600_I2CS_ADDR_INDICATE_MASK); + + if (AST2600_I2CS_ADDR1_NAK & isr) + isr &= ~AST2600_I2CS_ADDR1_NAK; + + if (AST2600_I2CS_ADDR2_NAK & isr) + isr &= ~AST2600_I2CS_ADDR2_NAK; + + if (AST2600_I2CS_ADDR3_NAK & isr) + isr &= ~AST2600_I2CS_ADDR3_NAK; + + if (AST2600_I2CS_ADDR_MASK & isr) + isr &= ~AST2600_I2CS_ADDR_MASK; + + if (AST2600_I2CS_PKT_DONE & isr) { + if (i2c_bus->mode == DMA_MODE) + ast2600_i2c_slave_packet_dma_irq(i2c_bus, isr); + else + ast2600_i2c_slave_packet_buff_irq(i2c_bus, isr); + } else { + ast2600_i2c_slave_byte_irq(i2c_bus, isr); + } + + return 1; +} +#endif + static int ast2600_i2c_setup_dma_tx(u32 cmd, struct ast2600_i2c_bus *i2c_bus) { struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; @@ -682,6 +1073,20 @@ static void ast2600_i2c_master_package_irq(struct ast2600_i2c_bus *i2c_bus, u32 } break; case AST2600_I2CM_RX_DONE: +#if IS_ENABLED(CONFIG_I2C_SLAVE) + /* + * Workaround for master/slave package mode enable rx done stuck issue + * When master go for first read (RX_DONE), slave mode will also effect + * Then controller will send nack, not operate anymore. + */ + if (readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS) & AST2600_I2CS_PKT_MODE_EN) { + u32 slave_cmd = readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + + writel(0, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(slave_cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + } + fallthrough; +#endif case AST2600_I2CM_RX_DONE | AST2600_I2CM_NORMAL_STOP: /* do next rx */ if (i2c_bus->mode == DMA_MODE) { @@ -810,6 +1215,12 @@ static irqreturn_t ast2600_i2c_bus_irq(int irq, void *dev_id) { struct ast2600_i2c_bus *i2c_bus = dev_id; +#if IS_ENABLED(CONFIG_I2C_SLAVE) + if (readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL) & AST2600_I2CC_SLAVE_EN) { + if (ast2600_i2c_slave_irq(i2c_bus)) + return IRQ_HANDLED; + } +#endif return IRQ_RETVAL(ast2600_i2c_master_irq(i2c_bus)); } @@ -827,12 +1238,30 @@ static int ast2600_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msg return ret; } +#if IS_ENABLED(CONFIG_I2C_SLAVE) + if (i2c_bus->mode == BUFF_MODE) { + if (i2c_bus->slave_operate) + return -EBUSY; + /* disable slave isr */ + writel(0, i2c_bus->reg_base + AST2600_I2CS_IER); + if (readl(i2c_bus->reg_base + AST2600_I2CS_ISR) || i2c_bus->slave_operate) { + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_IER); + return -EBUSY; + } + } +#endif + i2c_bus->cmd_err = 0; i2c_bus->msgs = msgs; i2c_bus->msgs_index = 0; i2c_bus->msgs_count = num; reinit_completion(&i2c_bus->cmd_complete); ret = ast2600_i2c_do_start(i2c_bus); +#if IS_ENABLED(CONFIG_I2C_SLAVE) + /* avoid race condication slave is wait and master wait 1st slave operate */ + if (i2c_bus->mode == BUFF_MODE) + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_IER); +#endif if (ret) goto master_out; timeout = wait_for_completion_timeout(&i2c_bus->cmd_complete, i2c_bus->adap.timeout); @@ -844,7 +1273,26 @@ static int ast2600_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msg readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF)); writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); +#if IS_ENABLED(CONFIG_I2C_SLAVE) + if (ctrl & AST2600_I2CC_SLAVE_EN) { + u32 cmd = SLAVE_TRIGGER_CMD; + if (i2c_bus->mode == DMA_MODE) { + cmd |= AST2600_I2CS_RX_DMA_EN; + writel(i2c_bus->slave_dma_addr, + i2c_bus->reg_base + AST2600_I2CS_RX_DMA); + writel(i2c_bus->slave_dma_addr, + i2c_bus->reg_base + AST2600_I2CS_TX_DMA); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + } else if (i2c_bus->mode == BUFF_MODE) { + cmd = SLAVE_TRIGGER_CMD; + } else { + cmd &= ~AST2600_I2CS_PKT_MODE_EN; + } + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + } +#endif if (i2c_bus->multi_master && (readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF) & AST2600_I2CC_BUS_BUSY_STS)) @@ -888,7 +1336,80 @@ static void ast2600_i2c_init(struct ast2600_i2c_bus *i2c_bus) /* Clear Interrupt */ writel(GENMASK(27, 0), i2c_bus->reg_base + AST2600_I2CM_ISR); + +#if IS_ENABLED(CONFIG_I2C_SLAVE) + /* for memory buffer initial */ + if (i2c_bus->mode == DMA_MODE) { + i2c_bus->slave_dma_buf = + dmam_alloc_coherent(i2c_bus->dev, I2C_SLAVE_MSG_BUF_SIZE, + &i2c_bus->slave_dma_addr, GFP_KERNEL); + if (!i2c_bus->slave_dma_buf) + return; + } + + writel(GENMASK(27, 0), i2c_bus->reg_base + AST2600_I2CS_ISR); + + if (i2c_bus->mode == BYTE_MODE) { + writel(GENMASK(15, 0), i2c_bus->reg_base + AST2600_I2CS_IER); + } else { + /* Set interrupt generation of I2C slave controller */ + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_IER); + } +#endif +} + +#if IS_ENABLED(CONFIG_I2C_SLAVE) +static int ast2600_i2c_reg_slave(struct i2c_client *client) +{ + struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(client->adapter); + u32 cmd = SLAVE_TRIGGER_CMD; + + if (i2c_bus->slave) + return -EINVAL; + + dev_dbg(i2c_bus->dev, "slave addr %x\n", client->addr); + + writel(0, i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL); + writel(AST2600_I2CC_SLAVE_EN | readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL), + i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + /* trigger rx buffer */ + if (i2c_bus->mode == DMA_MODE) { + cmd |= AST2600_I2CS_RX_DMA_EN; + writel(i2c_bus->slave_dma_addr, i2c_bus->reg_base + AST2600_I2CS_RX_DMA); + writel(i2c_bus->slave_dma_addr, i2c_bus->reg_base + AST2600_I2CS_TX_DMA); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_SLAVE_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + } else if (i2c_bus->mode == BUFF_MODE) { + cmd = SLAVE_TRIGGER_CMD; + } else { + cmd &= ~AST2600_I2CS_PKT_MODE_EN; + } + + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + i2c_bus->slave = client; + /* Set slave addr. */ + writel(client->addr | AST2600_I2CS_ADDR1_ENABLE, + i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL); + + return 0; +} + +static int ast2600_i2c_unreg_slave(struct i2c_client *slave) +{ + struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(slave->adapter); + + /* Turn off slave mode. */ + writel(~AST2600_I2CC_SLAVE_EN & readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL), + i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + writel(readl(i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL) & ~AST2600_I2CS_ADDR1_MASK, + i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL); + + i2c_bus->slave = NULL; + + return 0; } +#endif static u32 ast2600_i2c_functionality(struct i2c_adapter *adap) { @@ -898,6 +1419,10 @@ static u32 ast2600_i2c_functionality(struct i2c_adapter *adap) static const struct i2c_algorithm i2c_ast2600_algorithm = { .master_xfer = ast2600_i2c_master_xfer, .functionality = ast2600_i2c_functionality, +#if IS_ENABLED(CONFIG_I2C_SLAVE) + .reg_slave = ast2600_i2c_reg_slave, + .unreg_slave = ast2600_i2c_unreg_slave, +#endif }; static int ast2600_i2c_probe(struct platform_device *pdev) @@ -933,6 +1458,9 @@ static int ast2600_i2c_probe(struct platform_device *pdev) regmap_write(i2c_bus->global_regs, AST2600_I2CG_CLK_DIV_CTRL, I2CCG_DIV_CTRL); } +#if IS_ENABLED(CONFIG_I2C_SLAVE) + i2c_bus->slave_operate = 0; +#endif i2c_bus->dev = dev; i2c_bus->mode = BUFF_MODE;