From patchwork Mon Oct 7 03:52:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Chen X-Patchwork-Id: 1993368 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=patchwork.ozlabs.org) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4XMQHs3177z1xtV for ; Mon, 7 Oct 2024 14:54:01 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4XMQH25Z8Hz3frN for ; Mon, 7 Oct 2024 14:53:18 +1100 (AEDT) X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=211.20.114.72 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1728273184; cv=none; b=f3uvCj6alcpF13sinpzB8ay0nUG8h3ifFLel/AjE5cUKAOq5RmpjGlYFwO6mwiI1ufjlNAowSR1RJT/P5cqHTDYlC/tXhmr+kb1Syb7vGOZeNWZitn2+fEDZjFcbnCZRVCRNKDISiD8SIHXKNR6iQWos9BAXg6YvFE0tEkiqDODIjOLQt0fzrWziuiz9szF8955dLLIQzWwdc5TWQhUOfsFldZ2ta9EKoUCiRcEQqkcSxR92XH5cZUod1DmodQ7eIrhKqXdqW+r2fBL0r+sua+5kJKjqALEdeMRiCEw+BmcXXHDtqPNLACz33ppp4EazJWnD7UwX7iuJC8SszeMAgA== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1728273184; c=relaxed/relaxed; bh=HXUVEQlMjD69EmgflDutwtP83o7+ZdNw6nVfVlMAyhU=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=mtkKKe0gHu6SWAh/9COyz9KTlzEg5lXtpREIzvoU0Kwu2wTkzLusvUGno030REGw9J3bCPZ59z3uAI5rs42S02kRR4NxT2OEVcNvrP4sQvdbL7sKKJzVKjg+5Dirjxl9dPHUWo8rqStMAgOVl24WZP7vz7te8tX0VxrH9eUgk66cmNhmmjRJsE+E9WbvKTJjp0fi3Lmo7bInKGARCJQVcU4/arRa3GGqa3mVELO0bEtOY/DmQAvrehgzvxhs7Cxf3clzHBAWK/TEiUHyVvkLUBedyID5d12croQOnP4KSl9rQ1v3fVNmVI/shLWuYktzjIN3x2FrSqiwpIj5FtbZKw== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com; spf=pass (client-ip=211.20.114.72; helo=twmbx01.aspeed.com; envelope-from=ryan_chen@aspeedtech.com; receiver=lists.ozlabs.org) smtp.mailfrom=aspeedtech.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=aspeedtech.com Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=aspeedtech.com (client-ip=211.20.114.72; helo=twmbx01.aspeed.com; envelope-from=ryan_chen@aspeedtech.com; receiver=lists.ozlabs.org) Received: from TWMBX01.aspeed.com (mail.aspeedtech.com [211.20.114.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4XMQGj3FQgz2xZj; Mon, 7 Oct 2024 14:53:01 +1100 (AEDT) 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; Mon, 7 Oct 2024 11:52:35 +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; Mon, 7 Oct 2024 11:52:35 +0800 From: Ryan Chen To: , , , , , , , , , , , , , , , , Subject: [PATCH v15 3/3] i2c: aspeed: support AST2600 i2c new register target mode driver Date: Mon, 7 Oct 2024 11:52:35 +0800 Message-ID: <20241007035235.2254138-4-ryan_chen@aspeedtech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241007035235.2254138-1-ryan_chen@aspeedtech.com> References: <20241007035235.2254138-1-ryan_chen@aspeedtech.com> MIME-Version: 1.0 X-Spam-Status: No, score=0.0 required=5.0 tests=SPF_HELO_FAIL,SPF_PASS autolearn=disabled version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-13) on lists.ozlabs.org X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" This patch is for i2c new register target mode driver. Signed-off-by: Ryan Chen --- drivers/i2c/busses/i2c-ast2600.c | 561 +++++++++++++++++++++++++++++-- 1 file changed, 541 insertions(+), 20 deletions(-) diff --git a/drivers/i2c/busses/i2c-ast2600.c b/drivers/i2c/busses/i2c-ast2600.c index 17ba0ee77c27..6e9fcb1ebade 100644 --- a/drivers/i2c/busses/i2c-ast2600.c +++ b/drivers/i2c/busses/i2c-ast2600.c @@ -255,7 +255,7 @@ struct ast2600_i2c_bus { struct i2c_timings timing_info; struct completion cmd_complete; struct i2c_msg *msgs; - u8 *controller_dma_safe_buf; + u8 *dma_safe_buf; dma_addr_t controller_dma_addr; u32 apb_clk; u32 timeout; @@ -271,6 +271,13 @@ struct ast2600_i2c_bus { /* Buffer mode */ void __iomem *buf_base; struct i2c_smbus_alert_setup alert_data; +#if IS_ENABLED(CONFIG_I2C_SLAVE) + /* target structure */ + int target_operate; + unsigned char *target_dma_buf; + dma_addr_t target_dma_addr; + struct i2c_client *target; +#endif }; static u32 ast2600_select_i2c_clock(struct ast2600_i2c_bus *i2c_bus) @@ -361,6 +368,388 @@ static u8 ast2600_i2c_recover_bus(struct ast2600_i2c_bus *i2c_bus) return ret; } +#if IS_ENABLED(CONFIG_I2C_SLAVE) +static void ast2600_i2c_target_packet_dma_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + int target_rx_len = 0; + u32 cmd = 0; + u8 value; + int i; + + sts &= ~(AST2600_I2CS_SLAVE_PENDING); + /* Handle i2c target timeout condition */ + if (AST2600_I2CS_INACTIVE_TO & sts) { + cmd = TARGET_TRIGGER_CMD; + cmd |= AST2600_I2CS_RX_DMA_EN; + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_TARGET_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->target, 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->target, I2C_SLAVE_WRITE_REQUESTED, &value); + target_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CS_DMA_LEN_STS)); + for (i = 0; i < target_rx_len; i++) { + i2c_slave_event(i2c_bus->target, I2C_SLAVE_WRITE_RECEIVED, + &i2c_bus->target_dma_buf[i]); + } + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_TARGET_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = TARGET_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_STOP: + i2c_slave_event(i2c_bus->target, I2C_SLAVE_STOP, &value); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_TARGET_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = TARGET_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->target, I2C_SLAVE_WRITE_REQUESTED, &value); + + target_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CS_DMA_LEN_STS)); + for (i = 0; i < target_rx_len; i++) { + i2c_slave_event(i2c_bus->target, I2C_SLAVE_WRITE_RECEIVED, + &i2c_bus->target_dma_buf[i]); + } + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_TARGET_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + if (sts & AST2600_I2CS_STOP) + i2c_slave_event(i2c_bus->target, I2C_SLAVE_STOP, &value); + cmd = TARGET_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->target, I2C_SLAVE_WRITE_REQUESTED, &value); + + target_rx_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CS_DMA_LEN_STS)); + for (i = 0; i < target_rx_len; i++) { + i2c_slave_event(i2c_bus->target, I2C_SLAVE_WRITE_RECEIVED, + &i2c_bus->target_dma_buf[i]); + } + i2c_slave_event(i2c_bus->target, I2C_SLAVE_READ_REQUESTED, + &i2c_bus->target_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 = TARGET_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->target, I2C_SLAVE_READ_REQUESTED, + &i2c_bus->target_dma_buf[0]); + writel(AST2600_I2CS_SET_TX_DMA_LEN(1), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = TARGET_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->target, I2C_SLAVE_READ_PROCESSED, + &i2c_bus->target_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 = TARGET_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->target, I2C_SLAVE_STOP, &value); + writel(0, i2c_bus->reg_base + AST2600_I2CS_DMA_LEN_STS); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_TARGET_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + cmd = TARGET_TRIGGER_CMD | AST2600_I2CS_RX_DMA_EN; + break; + case AST2600_I2CS_SLAVE_MATCH | AST2600_I2CS_RX_DONE: + cmd = 0; + i2c_slave_event(i2c_bus->target, I2C_SLAVE_WRITE_REQUESTED, &value); + break; + case AST2600_I2CS_STOP: + cmd = 0; + i2c_slave_event(i2c_bus->target, I2C_SLAVE_STOP, &value); + break; + default: + dev_dbg(i2c_bus->dev, "unhandled target 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_target_packet_buff_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + int target_rx_len = 0; + u32 cmd = 0; + u8 value; + int i; + + /* due to controller target is common buffer, 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 target timeout condition */ + if (AST2600_I2CS_INACTIVE_TO & sts) { + writel(TARGET_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->target, I2C_SLAVE_STOP, &value); + i2c_bus->target_operate = 0; + return; + } + + sts &= ~(AST2600_I2CS_PKT_DONE | AST2600_I2CS_PKT_ERROR); + + if (sts & AST2600_I2CS_SLAVE_MATCH) + i2c_bus->target_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->target, 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->target, I2C_SLAVE_WRITE_REQUESTED, &value); + cmd = TARGET_TRIGGER_CMD; + if (sts & AST2600_I2CS_RX_DONE) { + target_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < target_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->target, I2C_SLAVE_WRITE_RECEIVED, &value); + } + } + if (readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS) & AST2600_I2CS_RX_BUFF_EN) + cmd = 0; + else + cmd = TARGET_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 = TARGET_TRIGGER_CMD; + target_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < target_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->target, 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 = TARGET_TRIGGER_CMD; + target_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < target_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->target, I2C_SLAVE_WRITE_RECEIVED, &value); + } + i2c_slave_event(i2c_bus->target, 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 = TARGET_TRIGGER_CMD; + target_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < target_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->target, 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->target, I2C_SLAVE_STOP, &value); + break; + case AST2600_I2CS_RX_DONE | AST2600_I2CS_STOP: + cmd = TARGET_TRIGGER_CMD; + target_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < target_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->target, 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->target, I2C_SLAVE_STOP, &value); + break; + case AST2600_I2CS_WAIT_TX_DMA | AST2600_I2CS_SLAVE_MATCH: + i2c_slave_event(i2c_bus->target, 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 = TARGET_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->target, I2C_SLAVE_WRITE_REQUESTED, &value); + + if (sts & AST2600_I2CS_RX_DONE) { + target_rx_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < target_rx_len; i++) { + value = readb(i2c_bus->buf_base + 0x10 + i); + i2c_slave_event(i2c_bus->target, I2C_SLAVE_WRITE_RECEIVED, &value); + } + i2c_slave_event(i2c_bus->target, I2C_SLAVE_READ_REQUESTED, &value); + } else { + i2c_slave_event(i2c_bus->target, 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 = TARGET_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->target, I2C_SLAVE_WRITE_REQUESTED, &value); + cmd = TARGET_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 = TARGET_TRIGGER_CMD; + i2c_slave_event(i2c_bus->target, I2C_SLAVE_STOP, &value); + break; + default: + dev_dbg(i2c_bus->dev, "unhandled target 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->target_operate = 0; +} + +static void ast2600_i2c_target_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->target, 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->target, 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->target, 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->target, 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->target, 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_target_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; + + /* + * Target 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_target_packet_dma_irq(i2c_bus, isr); + else + ast2600_i2c_target_packet_buff_irq(i2c_bus, isr); + } else { + ast2600_i2c_target_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]; @@ -376,16 +765,16 @@ static int ast2600_i2c_setup_dma_tx(u32 cmd, struct ast2600_i2c_bus *i2c_bus) if (cmd & AST2600_I2CM_START_CMD) { cmd |= AST2600_I2CM_PKT_ADDR(msg->addr); - i2c_bus->controller_dma_safe_buf = i2c_get_dma_safe_msg_buf(msg, 1); - if (!i2c_bus->controller_dma_safe_buf) + i2c_bus->dma_safe_buf = i2c_get_dma_safe_msg_buf(msg, 1); + if (!i2c_bus->dma_safe_buf) return -ENOMEM; i2c_bus->controller_dma_addr = - dma_map_single(i2c_bus->dev, i2c_bus->controller_dma_safe_buf, + dma_map_single(i2c_bus->dev, i2c_bus->dma_safe_buf, msg->len, DMA_TO_DEVICE); ret = dma_mapping_error(i2c_bus->dev, i2c_bus->controller_dma_addr); if (ret) { - i2c_put_dma_safe_msg_buf(i2c_bus->controller_dma_safe_buf, msg, false); - i2c_bus->controller_dma_safe_buf = NULL; + i2c_put_dma_safe_msg_buf(i2c_bus->dma_safe_buf, msg, false); + i2c_bus->dma_safe_buf = NULL; return ret; } } @@ -502,16 +891,15 @@ static int ast2600_i2c_setup_dma_rx(struct ast2600_i2c_bus *i2c_bus) cmd |= CONTROLLER_TRIGGER_LAST_STOP; } writel(AST2600_I2CM_SET_RX_DMA_LEN(xfer_len - 1), i2c_bus->reg_base + AST2600_I2CM_DMA_LEN); - i2c_bus->controller_dma_safe_buf = i2c_get_dma_safe_msg_buf(msg, 1); - if (!i2c_bus->controller_dma_safe_buf) + i2c_bus->dma_safe_buf = i2c_get_dma_safe_msg_buf(msg, 1); + if (!i2c_bus->dma_safe_buf) return -ENOMEM; i2c_bus->controller_dma_addr = - dma_map_single(i2c_bus->dev, i2c_bus->controller_dma_safe_buf, - msg->len, DMA_FROM_DEVICE); + dma_map_single(i2c_bus->dev, i2c_bus->dma_safe_buf, msg->len, DMA_FROM_DEVICE); ret = dma_mapping_error(i2c_bus->dev, i2c_bus->controller_dma_addr); if (ret) { - i2c_put_dma_safe_msg_buf(i2c_bus->controller_dma_safe_buf, msg, false); - i2c_bus->controller_dma_safe_buf = NULL; + i2c_put_dma_safe_msg_buf(i2c_bus->dma_safe_buf, msg, false); + i2c_bus->dma_safe_buf = NULL; return ret; } writel(i2c_bus->controller_dma_addr, i2c_bus->reg_base + AST2600_I2CM_RX_DMA); @@ -659,9 +1047,8 @@ static void ast2600_i2c_controller_package_irq(struct ast2600_i2c_bus *i2c_bus, if (i2c_bus->mode == DMA_MODE) { dma_unmap_single(i2c_bus->dev, i2c_bus->controller_dma_addr, msg->len, DMA_TO_DEVICE); - i2c_put_dma_safe_msg_buf(i2c_bus->controller_dma_safe_buf, - msg, true); - i2c_bus->controller_dma_safe_buf = NULL; + i2c_put_dma_safe_msg_buf(i2c_bus->dma_safe_buf, msg, true); + i2c_bus->dma_safe_buf = NULL; } i2c_bus->msgs_index++; if (i2c_bus->msgs_index == i2c_bus->msgs_count) { @@ -683,6 +1070,20 @@ static void ast2600_i2c_controller_package_irq(struct ast2600_i2c_bus *i2c_bus, } break; case AST2600_I2CM_RX_DONE: +#if IS_ENABLED(CONFIG_I2C_SLAVE) + /* + * Workaround for controller/target package mode enable rx done stuck issue + * When master go for first read (RX_DONE), target 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 target_cmd = readl(i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + + writel(0, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + writel(target_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) { @@ -712,9 +1113,8 @@ static void ast2600_i2c_controller_package_irq(struct ast2600_i2c_bus *i2c_bus, if (i2c_bus->mode == DMA_MODE) { dma_unmap_single(i2c_bus->dev, i2c_bus->controller_dma_addr, msg->len, DMA_FROM_DEVICE); - i2c_put_dma_safe_msg_buf(i2c_bus->controller_dma_safe_buf, - msg, true); - i2c_bus->controller_dma_safe_buf = NULL; + i2c_put_dma_safe_msg_buf(i2c_bus->dma_safe_buf, msg, true); + i2c_bus->dma_safe_buf = NULL; } i2c_bus->msgs_index++; @@ -812,6 +1212,12 @@ 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_target_irq(i2c_bus)) + return IRQ_HANDLED; + } +#endif return IRQ_RETVAL(ast2600_i2c_controller_irq(i2c_bus)); } @@ -828,12 +1234,30 @@ static int ast2600_i2c_controller_xfer(struct i2c_adapter *adap, struct i2c_msg return ret; } +#if IS_ENABLED(CONFIG_I2C_SLAVE) + if (i2c_bus->mode == BUFF_MODE) { + if (i2c_bus->target_operate) + return -EBUSY; + /* disable target isr */ + writel(0, i2c_bus->reg_base + AST2600_I2CS_IER); + if (readl(i2c_bus->reg_base + AST2600_I2CS_ISR) || i2c_bus->target_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 target is wait and master wait 1st target operate */ + if (i2c_bus->mode == BUFF_MODE) + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_IER); +#endif if (ret) goto controller_out; timeout = wait_for_completion_timeout(&i2c_bus->cmd_complete, i2c_bus->adap.timeout); @@ -845,7 +1269,26 @@ static int ast2600_i2c_controller_xfer(struct i2c_adapter *adap, struct i2c_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 = TARGET_TRIGGER_CMD; + if (i2c_bus->mode == DMA_MODE) { + cmd |= AST2600_I2CS_RX_DMA_EN; + writel(i2c_bus->target_dma_addr, + i2c_bus->reg_base + AST2600_I2CS_RX_DMA); + writel(i2c_bus->target_dma_addr, + i2c_bus->reg_base + AST2600_I2CS_TX_DMA); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_TARGET_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + } else if (i2c_bus->mode == BUFF_MODE) { + cmd = TARGET_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)) @@ -860,8 +1303,8 @@ static int ast2600_i2c_controller_xfer(struct i2c_adapter *adap, struct i2c_msg controller_out: if (i2c_bus->mode == DMA_MODE) { - kfree(i2c_bus->controller_dma_safe_buf); - i2c_bus->controller_dma_safe_buf = NULL; + kfree(i2c_bus->dma_safe_buf); + i2c_bus->dma_safe_buf = NULL; } return ret; @@ -889,7 +1332,78 @@ 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->target_dma_buf = + dmam_alloc_coherent(i2c_bus->dev, I2C_TARGET_MSG_BUF_SIZE, + &i2c_bus->target_dma_addr, GFP_KERNEL); + if (!i2c_bus->target_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 + writel(AST2600_I2CS_PKT_DONE, i2c_bus->reg_base + AST2600_I2CS_IER); +#endif +} + +#if IS_ENABLED(CONFIG_I2C_SLAVE) +static int ast2600_i2c_reg_target(struct i2c_client *client) +{ + struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(client->adapter); + u32 cmd = TARGET_TRIGGER_CMD; + + if (i2c_bus->target) + return -EINVAL; + + dev_dbg(i2c_bus->dev, "target 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->target_dma_addr, i2c_bus->reg_base + AST2600_I2CS_RX_DMA); + writel(i2c_bus->target_dma_addr, i2c_bus->reg_base + AST2600_I2CS_TX_DMA); + writel(AST2600_I2CS_SET_RX_DMA_LEN(I2C_TARGET_MSG_BUF_SIZE), + i2c_bus->reg_base + AST2600_I2CS_DMA_LEN); + } else if (i2c_bus->mode == BUFF_MODE) { + cmd = TARGET_TRIGGER_CMD; + } else { + cmd &= ~AST2600_I2CS_PKT_MODE_EN; + } + + writel(cmd, i2c_bus->reg_base + AST2600_I2CS_CMD_STS); + i2c_bus->target = client; + /* Set target addr. */ + writel(client->addr | AST2600_I2CS_ADDR1_ENABLE, + i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL); + + return 0; +} + +static int ast2600_i2c_unreg_target(struct i2c_client *client) +{ + struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(client->adapter); + + /* Turn off target 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->target = NULL; + + return 0; } +#endif static u32 ast2600_i2c_functionality(struct i2c_adapter *adap) { @@ -899,6 +1413,10 @@ static u32 ast2600_i2c_functionality(struct i2c_adapter *adap) static const struct i2c_algorithm i2c_ast2600_algorithm = { .xfer = ast2600_i2c_controller_xfer, .functionality = ast2600_i2c_functionality, +#if IS_ENABLED(CONFIG_I2C_SLAVE) + .reg_target = ast2600_i2c_reg_target, + .unreg_target = ast2600_i2c_unreg_target, +#endif }; static int ast2600_i2c_probe(struct platform_device *pdev) @@ -934,6 +1452,9 @@ 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->target_operate = 0; +#endif i2c_bus->dev = dev; i2c_bus->mode = BUFF_MODE;