From patchwork Mon Oct 7 03:52:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Chen X-Patchwork-Id: 13823996 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 DF591CFB43C for ; Mon, 7 Oct 2024 03:55:29 +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: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=WWv8VCtTga5WeRcDT8Zh54/sQxWWpGTOPOQV5hgeo/Q=; b=iva453zGiAr2CYA8vg1DSDT728 rDUY+UMHwCH3Rwzxs1C5VSPdbV15xhsmFfgHJA7YmUvpt1k40lbaU9fugVvdeDVKnH3C93hFkRuSA uGJ9Wo7Wn2m5zu9PZfQbm0c7H3ibi6kCQHkVMwTNc6HlDxek9OAqGri3W05dmpoVPo0HSW2hvmQ7h ZYw2vG86z6SDZYr/qw4gIKehEywYlQy07UV1ue7HYCeDcPA8Sb/lhd3X78fvLzi0Eb8AJPxl2cYSK lmWrx/X4yR+kl//h0tfgWkx3mVCrbKC/jhHFc1gf7X8nRh3HtX7edddTp0xEf5AOdpvB702o54+Ri iwF2tu9A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1sxeq7-00000001BLf-02xO; Mon, 07 Oct 2024 03:55:19 +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 1sxenc-00000001B0l-0yKu for linux-arm-kernel@lists.infradead.org; Mon, 07 Oct 2024 03:52:45 +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; 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: , , , , , , , , , , , , , , , , CC: Krzysztof Kozlowski Subject: [PATCH v15 1/3] dt-bindings: i2c: aspeed: support for AST2600-i2cv2 Date: Mon, 7 Oct 2024 11:52:33 +0800 Message-ID: <20241007035235.2254138-2-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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241006_205244_291823_A2260128 X-CRM114-Status: GOOD ( 10.05 ) 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 Add ast2600-i2cv2 compatible and aspeed,global-regs, aspeed,enable-dma and description for ast2600-i2cv2. Signed-off-by: Ryan Chen Reviewed-by: Krzysztof Kozlowski --- .../devicetree/bindings/i2c/aspeed,i2c.yaml | 51 +++++++++++++++++-- 1 file changed, 48 insertions(+), 3 deletions(-) diff --git a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml index 6df27b47b922..6c16fc76c978 100644 --- a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml @@ -9,9 +9,6 @@ title: ASPEED I2C on the AST24XX, AST25XX, and AST26XX SoCs maintainers: - Rayn Chen -allOf: - - $ref: /schemas/i2c/i2c-controller.yaml# - properties: compatible: enum: @@ -49,12 +46,50 @@ properties: description: states that there is another master active on this bus + aspeed,enable-dma: + type: boolean + description: | + I2C bus enable dma mode transfer. + + ASPEED ast2600 platform equipped with 16 I2C controllers that share a + single DMA engine. DTS files can specify the data transfer mode to/from + the device, either DMA or programmed I/O. However, hardware limitations + may require a DTS to manually allocate which controller can use DMA mode. + The "aspeed,enable-dma" property allows control of this. + + In cases where one the hardware design results in a specific + controller handling a larger amount of data, a DTS would likely + enable DMA mode for that one controller. + + aspeed,global-regs: + $ref: /schemas/types.yaml#/definitions/phandle + description: The phandle of i2c global register node. + required: - reg - compatible - clocks - resets +allOf: + - $ref: /schemas/i2c/i2c-controller.yaml# + - if: + properties: + compatible: + contains: + const: aspeed,ast2600-i2cv2 + + then: + properties: + reg: + minItems: 2 + required: + - aspeed,global-regs + else: + properties: + aspeed,global-regs: false + aspeed,enable-dma: false + unevaluatedProperties: false examples: @@ -71,3 +106,13 @@ examples: interrupts = <0>; interrupt-parent = <&i2c_ic>; }; + - | + #include + i2c1: i2c@80 { + compatible = "aspeed,ast2600-i2cv2"; + reg = <0x80 0x80>, <0xc00 0x20>; + aspeed,global-regs = <&i2c_global>; + clocks = <&syscon ASPEED_CLK_APB>; + resets = <&syscon ASPEED_RESET_I2C>; + interrupts = ; + }; From patchwork Mon Oct 7 03:52:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Chen X-Patchwork-Id: 13823997 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 D27A2CFB43C for ; Mon, 7 Oct 2024 03:56:46 +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=hI8MAxylzCbD6fGHSIsbRO+nrbHdxzaG8mdTC1aock8=; b=dapq3cHUDLy6KKNmU+iU2s8U1m Np/UbMSNaNuxwJo/tIMQcjF12oP4IDk+vPICbRz7C7/b8PdqKrflhUZWATzVufGiUDHjv7ctcwf9N BO6ojMgsCc4oyAf+n1/IK/AUGv6u5kL0v4WkBHk4uLRIAmvl89lNF3IAB9O337a3SPlz5VlFqxsl1 92uEd/IYg9eeKSbt7gQEZmONU0DEZx24RzZYTtuUGP1JQSD7IFpYr45DvZzCZebtdUzSbAzsHQGhx +H2J4tSoIDfXIJ6Vh5yUu56a8rLR44bOlWLQAXu9ELWr2j1O9+iHYpwo27LOqtTy8uGWxgXcYi2Oj h6uJpfJQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1sxerL-00000001BSM-1Vj9; Mon, 07 Oct 2024 03:56:35 +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 1sxend-00000001B0l-2mId for linux-arm-kernel@lists.infradead.org; Mon, 07 Oct 2024 03:52:48 +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; 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 2/3] i2c: aspeed: support AST2600 i2c new register mode driver Date: Mon, 7 Oct 2024 11:52:34 +0800 Message-ID: <20241007035235.2254138-3-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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241006_205245_883241_FA890365 X-CRM114-Status: GOOD ( 21.25 ) 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 Add i2c new register mode driver to support AST2600 i2c new register mode. AST2600 i2c controller have legacy and new register mode. The new register mode have global register support 4 base clock for scl clock selection, and new clock divider mode. The new register mode have separate register set to control i2c controller and target. This patch is for i2c controller mode driver. Signed-off-by: Ryan Chen --- drivers/i2c/busses/Kconfig | 11 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-ast2600.c | 1032 ++++++++++++++++++++++++++++++ 3 files changed, 1044 insertions(+) create mode 100644 drivers/i2c/busses/i2c-ast2600.c diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index a22f9125322a..abfb027350d4 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -410,6 +410,17 @@ config I2C_ALTERA This driver can also be built as a module. If so, the module will be called i2c-altera. +config I2C_AST2600 + tristate "Aspeed I2C v2 Controller" + depends on ARCH_ASPEED || COMPILE_TEST + select I2C_SMBUS + help + If you say yes to this option, support will be included for the + Aspeed I2C controller with new register set. + + This driver can also be built as a module. If so, the module + will be called i2c-ast2600. + config I2C_ASPEED tristate "Aspeed I2C Controller" depends on ARCH_ASPEED || COMPILE_TEST diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 78d0561339e5..5665b60b1566 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_I2C_POWERMAC) += i2c-powermac.o obj-$(CONFIG_I2C_ALTERA) += i2c-altera.o obj-$(CONFIG_I2C_AMD_MP2) += i2c-amd-mp2-pci.o i2c-amd-mp2-plat.o obj-$(CONFIG_I2C_ASPEED) += i2c-aspeed.o +obj-$(CONFIG_I2C_AST2600) += i2c-ast2600.o obj-$(CONFIG_I2C_AT91) += i2c-at91.o i2c-at91-objs := i2c-at91-core.o i2c-at91-master.o ifeq ($(CONFIG_I2C_AT91_SLAVE_EXPERIMENTAL),y) diff --git a/drivers/i2c/busses/i2c-ast2600.c b/drivers/i2c/busses/i2c-ast2600.c new file mode 100644 index 000000000000..17ba0ee77c27 --- /dev/null +++ b/drivers/i2c/busses/i2c-ast2600.c @@ -0,0 +1,1032 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ASPEED AST2600 new register set I2C controller driver + * + * Copyright (C) ASPEED Technology Inc. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define AST2600_I2CG_ISR 0x00 +#define AST2600_I2CG_SLAVE_ISR 0x04 +#define AST2600_I2CG_OWNER 0x08 +#define AST2600_I2CG_CTRL 0x0C +#define AST2600_I2CG_CLK_DIV_CTRL 0x10 + +#define AST2600_I2CG_SLAVE_PKT_NAK BIT(4) +#define AST2600_I2CG_M_S_SEPARATE_INTR BIT(3) +#define AST2600_I2CG_CTRL_NEW_REG BIT(2) +#define AST2600_I2CG_CTRL_NEW_CLK_DIV BIT(1) +#define AST2600_GLOBAL_INIT \ + (AST2600_I2CG_CTRL_NEW_REG | AST2600_I2CG_CTRL_NEW_CLK_DIV) +/* + * APB clk : 100Mhz + * div : scl : baseclk [APB/((div/2) + 1)] : tBuf [1/bclk * 16] + * I2CG10[31:24] base clk4 for i2c auto recovery timeout counter (0xC6) + * I2CG10[23:16] base clk3 for Standard-mode (100Khz) min tBuf 4.7us + * 0x3c : 100.8Khz : 3.225Mhz : 4.96us + * 0x3d : 99.2Khz : 3.174Mhz : 5.04us + * 0x3e : 97.65Khz : 3.125Mhz : 5.12us + * 0x40 : 97.75Khz : 3.03Mhz : 5.28us + * 0x41 : 99.5Khz : 2.98Mhz : 5.36us (default) + * I2CG10[15:8] base clk2 for Fast-mode (400Khz) min tBuf 1.3us + * 0x12 : 400Khz : 10Mhz : 1.6us + * I2CG10[7:0] base clk1 for Fast-mode Plus (1Mhz) min tBuf 0.5us + * 0x08 : 1Mhz : 20Mhz : 0.8us + */ +#define I2CCG_DIV_CTRL 0xC6411208 + +/* 0x00 : I2CC Controller/Target Function Control Register */ +#define AST2600_I2CC_FUN_CTRL 0x00 +#define AST2600_I2CC_SLAVE_ADDR_RX_EN BIT(20) +#define AST2600_I2CC_MASTER_RETRY_MASK GENMASK(19, 18) +#define AST2600_I2CC_MASTER_RETRY(x) (((x) & GENMASK(1, 0)) << 18) +#define AST2600_I2CC_BUS_AUTO_RELEASE BIT(17) +#define AST2600_I2CC_M_SDA_LOCK_EN BIT(16) +#define AST2600_I2CC_MULTI_MASTER_DIS BIT(15) +#define AST2600_I2CC_M_SCL_DRIVE_EN BIT(14) +#define AST2600_I2CC_MSB_STS BIT(9) +#define AST2600_I2CC_SDA_DRIVE_1T_EN BIT(8) +#define AST2600_I2CC_M_SDA_DRIVE_1T_EN BIT(7) +#define AST2600_I2CC_M_HIGH_SPEED_EN BIT(6) +/* reserver 5 : 2 */ +#define AST2600_I2CC_SLAVE_EN BIT(1) +#define AST2600_I2CC_MASTER_EN BIT(0) + +/* 0x04 : I2CC Controller/Target Clock and AC Timing Control Register #1 */ +#define AST2600_I2CC_AC_TIMING 0x04 +#define AST2600_I2CC_TTIMEOUT(x) (((x) & GENMASK(4, 0)) << 24) +#define AST2600_I2CC_TCKHIGHMIN(x) (((x) & GENMASK(3, 0)) << 20) +#define AST2600_I2CC_TCKHIGH(x) (((x) & GENMASK(3, 0)) << 16) +#define AST2600_I2CC_TCKLOW(x) (((x) & GENMASK(3, 0)) << 12) +#define AST2600_I2CC_THDDAT(x) (((x) & GENMASK(1, 0)) << 10) +#define AST2600_I2CC_TOUTBASECLK(x) (((x) & GENMASK(1, 0)) << 8) +#define AST2600_I2CC_TBASECLK(x) ((x) & GENMASK(3, 0)) + +/* 0x08 : I2CC Controller/Target Transmit/Receive Byte Buffer Register */ +#define AST2600_I2CC_STS_AND_BUFF 0x08 +#define AST2600_I2CC_TX_DIR_MASK GENMASK(31, 29) +#define AST2600_I2CC_SDA_OE BIT(28) +#define AST2600_I2CC_SDA_O BIT(27) +#define AST2600_I2CC_SCL_OE BIT(26) +#define AST2600_I2CC_SCL_O BIT(25) + +#define AST2600_I2CC_SCL_LINE_STS BIT(18) +#define AST2600_I2CC_SDA_LINE_STS BIT(17) +#define AST2600_I2CC_BUS_BUSY_STS BIT(16) + +#define AST2600_I2CC_GET_RX_BUFF(x) (((x) >> 8) & GENMASK(7, 0)) + +/* 0x0C : I2CC Controller/Target Pool Buffer Control Register */ +#define AST2600_I2CC_BUFF_CTRL 0x0C +#define AST2600_I2CC_GET_RX_BUF_LEN(x) (((x) & GENMASK(29, 24)) >> 24) +#define AST2600_I2CC_SET_RX_BUF_LEN(x) (((((x) - 1) & GENMASK(4, 0)) << 16) | BIT(0)) +#define AST2600_I2CC_SET_TX_BUF_LEN(x) (((((x) - 1) & GENMASK(4, 0)) << 8) | BIT(0)) +#define AST2600_I2CC_GET_TX_BUF_LEN(x) ((((x) & GENMASK(12, 8)) >> 8) + 1) + +/* 0x10 : I2CM Controller Interrupt Control Register */ +#define AST2600_I2CM_IER 0x10 +/* 0x14 : I2CM Controller Interrupt Status Register : WC */ +#define AST2600_I2CM_ISR 0x14 + +#define AST2600_I2CM_PKT_TIMEOUT BIT(18) +#define AST2600_I2CM_PKT_ERROR BIT(17) +#define AST2600_I2CM_PKT_DONE BIT(16) + +#define AST2600_I2CM_BUS_RECOVER_FAIL BIT(15) +#define AST2600_I2CM_SDA_DL_TO BIT(14) +#define AST2600_I2CM_BUS_RECOVER BIT(13) +#define AST2600_I2CM_SMBUS_ALT BIT(12) + +#define AST2600_I2CM_SCL_LOW_TO BIT(6) +#define AST2600_I2CM_ABNORMAL BIT(5) +#define AST2600_I2CM_NORMAL_STOP BIT(4) +#define AST2600_I2CM_ARBIT_LOSS BIT(3) +#define AST2600_I2CM_RX_DONE BIT(2) +#define AST2600_I2CM_TX_NAK BIT(1) +#define AST2600_I2CM_TX_ACK BIT(0) + +/* 0x18 : I2CM Controller Command/Status Register */ +#define AST2600_I2CM_CMD_STS 0x18 +#define AST2600_I2CM_PKT_ADDR(x) (((x) & GENMASK(6, 0)) << 24) +#define AST2600_I2CM_PKT_EN BIT(16) +#define AST2600_I2CM_SDA_OE_OUT_DIR BIT(15) +#define AST2600_I2CM_SDA_O_OUT_DIR BIT(14) +#define AST2600_I2CM_SCL_OE_OUT_DIR BIT(13) +#define AST2600_I2CM_SCL_O_OUT_DIR BIT(12) +#define AST2600_I2CM_RECOVER_CMD_EN BIT(11) + +#define AST2600_I2CM_RX_DMA_EN BIT(9) +#define AST2600_I2CM_TX_DMA_EN BIT(8) +/* Command Bit */ +#define AST2600_I2CM_RX_BUFF_EN BIT(7) +#define AST2600_I2CM_TX_BUFF_EN BIT(6) +#define AST2600_I2CM_STOP_CMD BIT(5) +#define AST2600_I2CM_RX_CMD_LAST BIT(4) +#define AST2600_I2CM_RX_CMD BIT(3) + +#define AST2600_I2CM_TX_CMD BIT(1) +#define AST2600_I2CM_START_CMD BIT(0) + +/* 0x1C : I2CM Controller DMA Transfer Length Register */ +#define AST2600_I2CM_DMA_LEN 0x1C +/* Tx Rx support length 1 ~ 4096 */ +#define AST2600_I2CM_SET_RX_DMA_LEN(x) ((((x) & GENMASK(11, 0)) << 16) | BIT(31)) +#define AST2600_I2CM_SET_TX_DMA_LEN(x) (((x) & GENMASK(11, 0)) | BIT(15)) + +/* 0x20 : I2CS Target Interrupt Control Register */ +#define AST2600_I2CS_IER 0x20 +/* 0x24 : I2CS Target Interrupt Status Register */ +#define AST2600_I2CS_ISR 0x24 + +#define AST2600_I2CS_ADDR_INDICATE_MASK GENMASK(31, 30) +#define AST2600_I2CS_SLAVE_PENDING BIT(29) + +#define AST2600_I2CS_WAIT_TX_DMA BIT(25) +#define AST2600_I2CS_WAIT_RX_DMA BIT(24) + +#define AST2600_I2CS_ADDR3_NAK BIT(22) +#define AST2600_I2CS_ADDR2_NAK BIT(21) +#define AST2600_I2CS_ADDR1_NAK BIT(20) + +#define AST2600_I2CS_ADDR_MASK GENMASK(19, 18) +#define AST2600_I2CS_PKT_ERROR BIT(17) +#define AST2600_I2CS_PKT_DONE BIT(16) +#define AST2600_I2CS_INACTIVE_TO BIT(15) + +#define AST2600_I2CS_SLAVE_MATCH BIT(7) +#define AST2600_I2CS_ABNOR_STOP BIT(5) +#define AST2600_I2CS_STOP BIT(4) +#define AST2600_I2CS_RX_DONE_NAK BIT(3) +#define AST2600_I2CS_RX_DONE BIT(2) +#define AST2600_I2CS_TX_NAK BIT(1) +#define AST2600_I2CS_TX_ACK BIT(0) + +/* 0x28 : I2CS Target CMD/Status Register */ +#define AST2600_I2CS_CMD_STS 0x28 +#define AST2600_I2CS_ACTIVE_ALL GENMASK(18, 17) +#define AST2600_I2CS_PKT_MODE_EN BIT(16) +#define AST2600_I2CS_AUTO_NAK_NOADDR BIT(15) +#define AST2600_I2CS_AUTO_NAK_EN BIT(14) + +#define AST2600_I2CS_ALT_EN BIT(10) +#define AST2600_I2CS_RX_DMA_EN BIT(9) +#define AST2600_I2CS_TX_DMA_EN BIT(8) +#define AST2600_I2CS_RX_BUFF_EN BIT(7) +#define AST2600_I2CS_TX_BUFF_EN BIT(6) +#define AST2600_I2CS_RX_CMD_LAST BIT(4) + +#define AST2600_I2CS_TX_CMD BIT(2) + +#define AST2600_I2CS_DMA_LEN 0x2C +#define AST2600_I2CS_SET_RX_DMA_LEN(x) (((((x) - 1) & GENMASK(11, 0)) << 16) | BIT(31)) +#define AST2600_I2CS_SET_TX_DMA_LEN(x) ((((x) - 1) & GENMASK(11, 0)) | BIT(15)) + +/* I2CM Controller DMA Tx Buffer Register */ +#define AST2600_I2CM_TX_DMA 0x30 +/* I2CM Controller DMA Rx Buffer Register */ +#define AST2600_I2CM_RX_DMA 0x34 +/* I2CS Target DMA Tx Buffer Register */ +#define AST2600_I2CS_TX_DMA 0x38 +/* I2CS Target DMA Rx Buffer Register */ +#define AST2600_I2CS_RX_DMA 0x3C + +#define AST2600_I2CS_ADDR_CTRL 0x40 + +#define AST2600_I2CS_ADDR3_MASK GENMASK(22, 16) +#define AST2600_I2CS_ADDR2_MASK GENMASK(14, 8) +#define AST2600_I2CS_ADDR1_MASK GENMASK(6, 0) + +#define AST2600_I2CM_DMA_LEN_STS 0x48 +#define AST2600_I2CS_DMA_LEN_STS 0x4C + +#define AST2600_I2C_GET_TX_DMA_LEN(x) ((x) & GENMASK(12, 0)) +#define AST2600_I2C_GET_RX_DMA_LEN(x) (((x) & GENMASK(28, 16)) >> 16) + +/* 0x40 : Target Device Address Register */ +#define AST2600_I2CS_ADDR3_ENABLE BIT(23) +#define AST2600_I2CS_ADDR3(x) ((x) << 16) +#define AST2600_I2CS_ADDR2_ENABLE BIT(15) +#define AST2600_I2CS_ADDR2(x) ((x) << 8) +#define AST2600_I2CS_ADDR1_ENABLE BIT(7) +#define AST2600_I2CS_ADDR1(x) (x) + +#define I2C_TARGET_MSG_BUF_SIZE 256 + +#define AST2600_I2C_DMA_SIZE 4096 + +#define CONTROLLER_TRIGGER_LAST_STOP (AST2600_I2CM_RX_CMD_LAST | AST2600_I2CM_STOP_CMD) +#define TARGET_TRIGGER_CMD (AST2600_I2CS_ACTIVE_ALL | AST2600_I2CS_PKT_MODE_EN) + +#define AST_I2C_TIMEOUT_CLK 0x2 + +enum xfer_mode { + BYTE_MODE, + BUFF_MODE, + DMA_MODE, +}; + +struct ast2600_i2c_bus { + struct i2c_adapter adap; + struct device *dev; + void __iomem *reg_base; + struct regmap *global_regs; + struct reset_control *rst; + struct clk *clk; + struct i2c_timings timing_info; + struct completion cmd_complete; + struct i2c_msg *msgs; + u8 *controller_dma_safe_buf; + dma_addr_t controller_dma_addr; + u32 apb_clk; + u32 timeout; + int irq; + int cmd_err; + int msgs_index; + int msgs_count; + int controller_xfer_cnt; + size_t buf_index; + size_t buf_size; + enum xfer_mode mode; + bool multi_master; + /* Buffer mode */ + void __iomem *buf_base; + struct i2c_smbus_alert_setup alert_data; +}; + +static u32 ast2600_select_i2c_clock(struct ast2600_i2c_bus *i2c_bus) +{ + unsigned long base_clk[16]; + int baseclk_idx = 0; + int divisor = 0; + u32 clk_div_reg; + u32 scl_low; + u32 scl_high; + u32 data; + + regmap_read(i2c_bus->global_regs, AST2600_I2CG_CLK_DIV_CTRL, &clk_div_reg); + + for (int i = 0; i < ARRAY_SIZE(base_clk); i++) { + if (i == 0) + base_clk[i] = i2c_bus->apb_clk; + else if (i < 5) + base_clk[i] = (i2c_bus->apb_clk * 2) / + (((clk_div_reg >> ((i - 1) * 8)) & GENMASK(7, 0)) + 2); + else + base_clk[i] = base_clk[4] >> (i - 5); + + if ((base_clk[i] / i2c_bus->timing_info.bus_freq_hz) <= 32) { + baseclk_idx = i; + divisor = DIV_ROUND_UP(base_clk[i], i2c_bus->timing_info.bus_freq_hz); + break; + } + } + baseclk_idx = min(baseclk_idx, 15); + divisor = min(divisor, 32); + scl_low = min(divisor * 9 / 16 - 1, 15); + scl_high = (divisor - scl_low - 2) & GENMASK(3, 0); + data = (scl_high - 1) << 20 | scl_high << 16 | scl_low << 12 | baseclk_idx; + if (i2c_bus->timeout) { + data |= AST2600_I2CC_TOUTBASECLK(AST_I2C_TIMEOUT_CLK); + data |= AST2600_I2CC_TTIMEOUT(i2c_bus->timeout); + } + + return data; +} + +static u8 ast2600_i2c_recover_bus(struct ast2600_i2c_bus *i2c_bus) +{ + u32 state = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + int ret = 0; + u32 ctrl; + int r; + + dev_dbg(i2c_bus->dev, "%d-bus recovery bus [%x]\n", i2c_bus->adap.nr, state); + + ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + /* Disable controller */ + writel(ctrl & ~(AST2600_I2CC_MASTER_EN | AST2600_I2CC_SLAVE_EN), + i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + writel(readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL) | AST2600_I2CC_MASTER_EN, + i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + reinit_completion(&i2c_bus->cmd_complete); + i2c_bus->cmd_err = 0; + + /* Check 0x14's SDA and SCL status */ + state = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + if (!(state & AST2600_I2CC_SDA_LINE_STS) && (state & AST2600_I2CC_SCL_LINE_STS)) { + writel(AST2600_I2CM_RECOVER_CMD_EN, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + r = wait_for_completion_timeout(&i2c_bus->cmd_complete, i2c_bus->adap.timeout); + if (r == 0) { + dev_dbg(i2c_bus->dev, "recovery timed out\n"); + writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + return -ETIMEDOUT; + } else if (i2c_bus->cmd_err) { + dev_dbg(i2c_bus->dev, "recovery error\n"); + ret = -EPROTO; + } + } + + /* Recovery done */ + state = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + if (state & AST2600_I2CC_BUS_BUSY_STS) { + dev_dbg(i2c_bus->dev, "Can't recover bus [%x]\n", state); + ret = -EPROTO; + } + + /* restore original controller setting */ + writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + return ret; +} + +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]; + int xfer_len; + int ret; + + cmd |= AST2600_I2CM_PKT_EN; + xfer_len = msg->len - i2c_bus->controller_xfer_cnt; + if (xfer_len > AST2600_I2C_DMA_SIZE) + xfer_len = AST2600_I2C_DMA_SIZE; + else if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) + cmd |= AST2600_I2CM_STOP_CMD; + + 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) + return -ENOMEM; + i2c_bus->controller_dma_addr = + dma_map_single(i2c_bus->dev, i2c_bus->controller_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; + return ret; + } + } + + if (xfer_len) { + cmd |= AST2600_I2CM_TX_DMA_EN | AST2600_I2CM_TX_CMD; + writel(AST2600_I2CM_SET_TX_DMA_LEN(xfer_len - 1), + i2c_bus->reg_base + AST2600_I2CM_DMA_LEN); + writel(i2c_bus->controller_dma_addr + i2c_bus->controller_xfer_cnt, + i2c_bus->reg_base + AST2600_I2CM_TX_DMA); + } + + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + + return 0; +} + +static int ast2600_i2c_setup_buff_tx(u32 cmd, struct ast2600_i2c_bus *i2c_bus) +{ + struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; + u32 wbuf_dword; + int xfer_len; + int i; + + cmd |= AST2600_I2CM_PKT_EN; + xfer_len = msg->len - i2c_bus->controller_xfer_cnt; + if (xfer_len > i2c_bus->buf_size) + xfer_len = i2c_bus->buf_size; + else if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) + cmd |= AST2600_I2CM_STOP_CMD; + + if (cmd & AST2600_I2CM_START_CMD) + cmd |= AST2600_I2CM_PKT_ADDR(msg->addr); + + if (xfer_len) { + cmd |= AST2600_I2CM_TX_BUFF_EN | AST2600_I2CM_TX_CMD; + /* + * The controller's buffer register supports dword writes only. + * Therefore, write dwords to the buffer register in a 4-byte aligned, + * and write the remaining unaligned data at the end. + */ + for (i = 0; i < xfer_len; i += 4) { + int xfer_cnt = i2c_bus->controller_xfer_cnt + i; + + switch (min(xfer_len - i, 4) % 4) { + case 1: + wbuf_dword = msg->buf[xfer_cnt]; + break; + case 2: + wbuf_dword = get_unaligned_le16(&msg->buf[xfer_cnt]); + break; + case 3: + wbuf_dword = get_unaligned_le24(&msg->buf[xfer_cnt]); + break; + default: + wbuf_dword = get_unaligned_le32(&msg->buf[xfer_cnt]); + break; + } + writel(wbuf_dword, i2c_bus->buf_base + i); + } + writel(AST2600_I2CC_SET_TX_BUF_LEN(xfer_len), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + } + + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + + return 0; +} + +static int ast2600_i2c_setup_byte_tx(u32 cmd, struct ast2600_i2c_bus *i2c_bus) +{ + struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; + int xfer_len; + + xfer_len = msg->len - i2c_bus->controller_xfer_cnt; + + cmd |= AST2600_I2CM_PKT_EN; + + if (cmd & AST2600_I2CM_START_CMD) + cmd |= AST2600_I2CM_PKT_ADDR(msg->addr); + + if ((i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) && + ((i2c_bus->controller_xfer_cnt + 1) == msg->len)) + cmd |= AST2600_I2CM_STOP_CMD; + + if (xfer_len) { + cmd |= AST2600_I2CM_TX_CMD; + writel(msg->buf[i2c_bus->controller_xfer_cnt], + i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF); + } + + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + + return 0; +} + +static int ast2600_i2c_setup_dma_rx(struct ast2600_i2c_bus *i2c_bus) +{ + struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; + int xfer_len; + u32 cmd; + int ret; + + cmd = AST2600_I2CM_PKT_EN | AST2600_I2CM_PKT_ADDR(msg->addr) | + AST2600_I2CM_START_CMD | AST2600_I2CM_RX_DMA_EN; + + if (msg->flags & I2C_M_RECV_LEN) { + xfer_len = 1; + } else if (msg->len > AST2600_I2C_DMA_SIZE) { + xfer_len = AST2600_I2C_DMA_SIZE; + } else { + xfer_len = msg->len; + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) + 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) + return -ENOMEM; + i2c_bus->controller_dma_addr = + dma_map_single(i2c_bus->dev, i2c_bus->controller_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; + return ret; + } + writel(i2c_bus->controller_dma_addr, i2c_bus->reg_base + AST2600_I2CM_RX_DMA); + + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + + return 0; +} + +static int ast2600_i2c_setup_buff_rx(struct ast2600_i2c_bus *i2c_bus) +{ + struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; + int xfer_len; + u32 cmd; + + cmd = AST2600_I2CM_PKT_EN | AST2600_I2CM_PKT_ADDR(msg->addr) | + AST2600_I2CM_START_CMD | AST2600_I2CM_RX_BUFF_EN; + + if (msg->flags & I2C_M_RECV_LEN) { + dev_dbg(i2c_bus->dev, "smbus read\n"); + xfer_len = 1; + } else if (msg->len > i2c_bus->buf_size) { + xfer_len = i2c_bus->buf_size; + } else { + xfer_len = msg->len; + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) + cmd |= CONTROLLER_TRIGGER_LAST_STOP; + } + writel(AST2600_I2CC_SET_RX_BUF_LEN(xfer_len), i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + + return 0; +} + +static int ast2600_i2c_setup_byte_rx(struct ast2600_i2c_bus *i2c_bus) +{ + struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; + u32 cmd; + + cmd = AST2600_I2CM_PKT_EN | AST2600_I2CM_PKT_ADDR(msg->addr) | + AST2600_I2CM_START_CMD | AST2600_I2CM_RX_CMD; + + if (msg->flags & I2C_M_RECV_LEN) { + dev_dbg(i2c_bus->dev, "smbus read\n"); + } else if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) { + if (msg->len == 1) + cmd |= CONTROLLER_TRIGGER_LAST_STOP; + } + + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + + return 0; +} + +static int ast2600_i2c_do_start(struct ast2600_i2c_bus *i2c_bus) +{ + struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; + + /* send start */ + dev_dbg(i2c_bus->dev, "[%d] %s %d byte%s %s 0x%02x\n", + i2c_bus->msgs_index, str_read_write(msg->flags & I2C_M_RD), + msg->len, str_plural(msg->len), + msg->flags & I2C_M_RD ? "from" : "to", msg->addr); + + i2c_bus->controller_xfer_cnt = 0; + i2c_bus->buf_index = 0; + + if (msg->flags & I2C_M_RD) { + if (i2c_bus->mode == DMA_MODE) + return ast2600_i2c_setup_dma_rx(i2c_bus); + else if (i2c_bus->mode == BUFF_MODE) + return ast2600_i2c_setup_buff_rx(i2c_bus); + else + return ast2600_i2c_setup_byte_rx(i2c_bus); + } else { + if (i2c_bus->mode == DMA_MODE) + return ast2600_i2c_setup_dma_tx(AST2600_I2CM_START_CMD, i2c_bus); + else if (i2c_bus->mode == BUFF_MODE) + return ast2600_i2c_setup_buff_tx(AST2600_I2CM_START_CMD, i2c_bus); + else + return ast2600_i2c_setup_byte_tx(AST2600_I2CM_START_CMD, i2c_bus); + } +} + +static int ast2600_i2c_irq_err_to_errno(u32 irq_status) +{ + if (irq_status & AST2600_I2CM_ARBIT_LOSS) + return -EAGAIN; + if (irq_status & (AST2600_I2CM_SDA_DL_TO | AST2600_I2CM_SCL_LOW_TO)) + return -EBUSY; + if (irq_status & (AST2600_I2CM_ABNORMAL)) + return -EPROTO; + + return 0; +} + +static void ast2600_i2c_controller_package_irq(struct ast2600_i2c_bus *i2c_bus, u32 sts) +{ + struct i2c_msg *msg = &i2c_bus->msgs[i2c_bus->msgs_index]; + u32 cmd = AST2600_I2CM_PKT_EN; + int xfer_len; + int i; + + sts &= ~AST2600_I2CM_PKT_DONE; + writel(AST2600_I2CM_PKT_DONE, i2c_bus->reg_base + AST2600_I2CM_ISR); + switch (sts) { + case AST2600_I2CM_PKT_ERROR: + i2c_bus->cmd_err = -EAGAIN; + complete(&i2c_bus->cmd_complete); + break; + case AST2600_I2CM_PKT_ERROR | AST2600_I2CM_TX_NAK: /* a0 fix for issue */ + fallthrough; + case AST2600_I2CM_PKT_ERROR | AST2600_I2CM_TX_NAK | AST2600_I2CM_NORMAL_STOP: + i2c_bus->cmd_err = -ENXIO; + complete(&i2c_bus->cmd_complete); + break; + case AST2600_I2CM_NORMAL_STOP: + /* write 0 byte only have stop isr */ + i2c_bus->msgs_index++; + if (i2c_bus->msgs_index < i2c_bus->msgs_count) { + if (ast2600_i2c_do_start(i2c_bus)) { + i2c_bus->cmd_err = -ENOMEM; + complete(&i2c_bus->cmd_complete); + } + } else { + i2c_bus->cmd_err = i2c_bus->msgs_index; + complete(&i2c_bus->cmd_complete); + } + break; + case AST2600_I2CM_TX_ACK: + case AST2600_I2CM_TX_ACK | AST2600_I2CM_NORMAL_STOP: + if (i2c_bus->mode == DMA_MODE) + xfer_len = AST2600_I2C_GET_TX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CM_DMA_LEN_STS)); + else if (i2c_bus->mode == BUFF_MODE) + xfer_len = AST2600_I2CC_GET_TX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + else + xfer_len = 1; + + i2c_bus->controller_xfer_cnt += xfer_len; + + if (i2c_bus->controller_xfer_cnt == msg->len) { + 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_bus->msgs_index++; + if (i2c_bus->msgs_index == i2c_bus->msgs_count) { + i2c_bus->cmd_err = i2c_bus->msgs_index; + complete(&i2c_bus->cmd_complete); + } else { + if (ast2600_i2c_do_start(i2c_bus)) { + i2c_bus->cmd_err = -ENOMEM; + complete(&i2c_bus->cmd_complete); + } + } + } else { + if (i2c_bus->mode == DMA_MODE) + ast2600_i2c_setup_dma_tx(0, i2c_bus); + else if (i2c_bus->mode == BUFF_MODE) + ast2600_i2c_setup_buff_tx(0, i2c_bus); + else + ast2600_i2c_setup_byte_tx(0, i2c_bus); + } + break; + case AST2600_I2CM_RX_DONE: + case AST2600_I2CM_RX_DONE | AST2600_I2CM_NORMAL_STOP: + /* do next rx */ + if (i2c_bus->mode == DMA_MODE) { + xfer_len = AST2600_I2C_GET_RX_DMA_LEN(readl(i2c_bus->reg_base + + AST2600_I2CM_DMA_LEN_STS)); + } else if (i2c_bus->mode == BUFF_MODE) { + xfer_len = AST2600_I2CC_GET_RX_BUF_LEN(readl(i2c_bus->reg_base + + AST2600_I2CC_BUFF_CTRL)); + for (i = 0; i < xfer_len; i++) + msg->buf[i2c_bus->controller_xfer_cnt + i] = + readb(i2c_bus->buf_base + 0x10 + i); + } else { + xfer_len = 1; + msg->buf[i2c_bus->controller_xfer_cnt] = + AST2600_I2CC_GET_RX_BUFF(readl(i2c_bus->reg_base + + AST2600_I2CC_STS_AND_BUFF)); + } + + if (msg->flags & I2C_M_RECV_LEN) { + msg->len = min_t(unsigned int, msg->buf[0], I2C_SMBUS_BLOCK_MAX); + msg->len += ((msg->flags & I2C_CLIENT_PEC) ? 2 : 1); + msg->flags &= ~I2C_M_RECV_LEN; + } + i2c_bus->controller_xfer_cnt += xfer_len; + + if (i2c_bus->controller_xfer_cnt == msg->len) { + 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_bus->msgs_index++; + if (i2c_bus->msgs_index == i2c_bus->msgs_count) { + i2c_bus->cmd_err = i2c_bus->msgs_index; + complete(&i2c_bus->cmd_complete); + } else { + if (ast2600_i2c_do_start(i2c_bus)) { + i2c_bus->cmd_err = -ENOMEM; + complete(&i2c_bus->cmd_complete); + } + } + } else { + /* next rx */ + cmd |= AST2600_I2CM_RX_CMD; + if (i2c_bus->mode == DMA_MODE) { + cmd |= AST2600_I2CM_RX_DMA_EN; + xfer_len = msg->len - i2c_bus->controller_xfer_cnt; + if (xfer_len > AST2600_I2C_DMA_SIZE) { + xfer_len = AST2600_I2C_DMA_SIZE; + } else { + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) + cmd |= CONTROLLER_TRIGGER_LAST_STOP; + } + writel(AST2600_I2CM_SET_RX_DMA_LEN(xfer_len - 1), + i2c_bus->reg_base + AST2600_I2CM_DMA_LEN); + writel(i2c_bus->controller_dma_addr + i2c_bus->controller_xfer_cnt, + i2c_bus->reg_base + AST2600_I2CM_RX_DMA); + } else if (i2c_bus->mode == BUFF_MODE) { + cmd |= AST2600_I2CM_RX_BUFF_EN; + xfer_len = msg->len - i2c_bus->controller_xfer_cnt; + if (xfer_len > i2c_bus->buf_size) { + xfer_len = i2c_bus->buf_size; + } else { + if (i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) + cmd |= CONTROLLER_TRIGGER_LAST_STOP; + } + writel(AST2600_I2CC_SET_RX_BUF_LEN(xfer_len), + i2c_bus->reg_base + AST2600_I2CC_BUFF_CTRL); + } else { + if ((i2c_bus->msgs_index + 1 == i2c_bus->msgs_count) && + ((i2c_bus->controller_xfer_cnt + 1) == msg->len)) { + cmd |= CONTROLLER_TRIGGER_LAST_STOP; + } + } + writel(cmd, i2c_bus->reg_base + AST2600_I2CM_CMD_STS); + } + break; + default: + dev_dbg(i2c_bus->dev, "unhandled sts %x\n", sts); + break; + } +} + +static int ast2600_i2c_controller_irq(struct ast2600_i2c_bus *i2c_bus) +{ + u32 sts = readl(i2c_bus->reg_base + AST2600_I2CM_ISR); + u32 ctrl; + + sts &= ~AST2600_I2CM_SMBUS_ALT; + + if (AST2600_I2CM_BUS_RECOVER_FAIL & sts) { + writel(AST2600_I2CM_BUS_RECOVER_FAIL, i2c_bus->reg_base + AST2600_I2CM_ISR); + ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + i2c_bus->cmd_err = -EPROTO; + complete(&i2c_bus->cmd_complete); + return 1; + } + + if (AST2600_I2CM_BUS_RECOVER & sts) { + writel(AST2600_I2CM_BUS_RECOVER, i2c_bus->reg_base + AST2600_I2CM_ISR); + i2c_bus->cmd_err = 0; + complete(&i2c_bus->cmd_complete); + return 1; + } + + i2c_bus->cmd_err = ast2600_i2c_irq_err_to_errno(sts); + if (i2c_bus->cmd_err) { + writel(AST2600_I2CM_PKT_DONE, i2c_bus->reg_base + AST2600_I2CM_ISR); + complete(&i2c_bus->cmd_complete); + return 1; + } + + if (AST2600_I2CM_PKT_DONE & sts) { + ast2600_i2c_controller_package_irq(i2c_bus, sts); + return 1; + } + + return 0; +} + +static irqreturn_t ast2600_i2c_bus_irq(int irq, void *dev_id) +{ + struct ast2600_i2c_bus *i2c_bus = dev_id; + + return IRQ_RETVAL(ast2600_i2c_controller_irq(i2c_bus)); +} + +static int ast2600_i2c_controller_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) +{ + struct ast2600_i2c_bus *i2c_bus = i2c_get_adapdata(adap); + unsigned long timeout; + int ret; + + if (!i2c_bus->multi_master && + (readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF) & AST2600_I2CC_BUS_BUSY_STS)) { + ret = ast2600_i2c_recover_bus(i2c_bus); + if (ret) + return ret; + } + + 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 (ret) + goto controller_out; + timeout = wait_for_completion_timeout(&i2c_bus->cmd_complete, i2c_bus->adap.timeout); + if (timeout == 0) { + u32 ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + dev_dbg(i2c_bus->dev, "timeout isr[%x], sts[%x]\n", + readl(i2c_bus->reg_base + AST2600_I2CM_ISR), + 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 (i2c_bus->multi_master && + (readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF) & + AST2600_I2CC_BUS_BUSY_STS)) + ast2600_i2c_recover_bus(i2c_bus); + + ret = -ETIMEDOUT; + } else { + ret = i2c_bus->cmd_err; + } + + dev_dbg(i2c_bus->dev, "bus%d-m: %d end\n", i2c_bus->adap.nr, i2c_bus->cmd_err); + +controller_out: + if (i2c_bus->mode == DMA_MODE) { + kfree(i2c_bus->controller_dma_safe_buf); + i2c_bus->controller_dma_safe_buf = NULL; + } + + return ret; +} + +static void ast2600_i2c_init(struct ast2600_i2c_bus *i2c_bus) +{ + struct platform_device *pdev = to_platform_device(i2c_bus->dev); + u32 fun_ctrl = AST2600_I2CC_BUS_AUTO_RELEASE | AST2600_I2CC_MASTER_EN; + + /* I2C Reset */ + writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + + i2c_bus->multi_master = device_property_read_bool(&pdev->dev, "multi-master"); + if (!i2c_bus->multi_master) + fun_ctrl |= AST2600_I2CC_MULTI_MASTER_DIS; + + /* Enable Controller Mode */ + writel(fun_ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + /* disable target address */ + writel(0, i2c_bus->reg_base + AST2600_I2CS_ADDR_CTRL); + + /* Set AC Timing */ + writel(ast2600_select_i2c_clock(i2c_bus), i2c_bus->reg_base + AST2600_I2CC_AC_TIMING); + + /* Clear Interrupt */ + writel(GENMASK(27, 0), i2c_bus->reg_base + AST2600_I2CM_ISR); +} + +static u32 ast2600_i2c_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_BLOCK_DATA; +} + +static const struct i2c_algorithm i2c_ast2600_algorithm = { + .xfer = ast2600_i2c_controller_xfer, + .functionality = ast2600_i2c_functionality, +}; + +static int ast2600_i2c_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ast2600_i2c_bus *i2c_bus; + struct resource *res; + u32 global_ctrl; + int ret; + + i2c_bus = devm_kzalloc(dev, sizeof(*i2c_bus), GFP_KERNEL); + if (!i2c_bus) + return -ENOMEM; + + i2c_bus->reg_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(i2c_bus->reg_base)) + return PTR_ERR(i2c_bus->reg_base); + + i2c_bus->rst = devm_reset_control_get_shared(dev, NULL); + if (IS_ERR(i2c_bus->rst)) + return dev_err_probe(dev, PTR_ERR(i2c_bus->rst), "Missing reset ctrl\n"); + + reset_control_deassert(i2c_bus->rst); + + i2c_bus->global_regs = + syscon_regmap_lookup_by_phandle(dev_of_node(dev), "aspeed,global-regs"); + if (IS_ERR(i2c_bus->global_regs)) + return PTR_ERR(i2c_bus->global_regs); + + regmap_read(i2c_bus->global_regs, AST2600_I2CG_CTRL, &global_ctrl); + if ((global_ctrl & AST2600_GLOBAL_INIT) != AST2600_GLOBAL_INIT) { + regmap_write(i2c_bus->global_regs, AST2600_I2CG_CTRL, AST2600_GLOBAL_INIT); + regmap_write(i2c_bus->global_regs, AST2600_I2CG_CLK_DIV_CTRL, I2CCG_DIV_CTRL); + } + + i2c_bus->dev = dev; + i2c_bus->mode = BUFF_MODE; + + if (device_property_read_bool(dev, "aspeed,enable-dma")) + i2c_bus->mode = DMA_MODE; + + if (i2c_bus->mode == BUFF_MODE) { + i2c_bus->buf_base = devm_platform_get_and_ioremap_resource(pdev, 1, &res); + if (IS_ERR(i2c_bus->buf_base)) + i2c_bus->mode = BYTE_MODE; + else + i2c_bus->buf_size = resource_size(res) / 2; + } + + /* + * i2c timeout counter: use base clk4 1Mhz, + * per unit: 1/(1000/4096) = 4096us + */ + ret = device_property_read_u32(dev, "i2c-scl-clk-low-timeout-us", &i2c_bus->timeout); + if (!ret) + i2c_bus->timeout /= 4096; + + init_completion(&i2c_bus->cmd_complete); + + i2c_bus->irq = platform_get_irq(pdev, 0); + if (i2c_bus->irq < 0) + return i2c_bus->irq; + + platform_set_drvdata(pdev, i2c_bus); + + i2c_bus->clk = devm_clk_get(i2c_bus->dev, NULL); + if (IS_ERR(i2c_bus->clk)) + return dev_err_probe(i2c_bus->dev, PTR_ERR(i2c_bus->clk), "Can't get clock\n"); + + i2c_bus->apb_clk = clk_get_rate(i2c_bus->clk); + + i2c_parse_fw_timings(i2c_bus->dev, &i2c_bus->timing_info, true); + + /* Initialize the I2C adapter */ + i2c_bus->adap.owner = THIS_MODULE; + i2c_bus->adap.algo = &i2c_ast2600_algorithm; + i2c_bus->adap.retries = 0; + i2c_bus->adap.dev.parent = i2c_bus->dev; + device_set_node(&i2c_bus->adap.dev, dev_fwnode(dev)); + i2c_bus->adap.algo_data = i2c_bus; + strscpy(i2c_bus->adap.name, pdev->name); + i2c_set_adapdata(&i2c_bus->adap, i2c_bus); + + ast2600_i2c_init(i2c_bus); + + ret = devm_request_irq(dev, i2c_bus->irq, ast2600_i2c_bus_irq, 0, + dev_name(dev), i2c_bus); + if (ret < 0) + return dev_err_probe(dev, ret, "Unable to request irq %d\n", i2c_bus->irq); + + writel(AST2600_I2CM_PKT_DONE | AST2600_I2CM_BUS_RECOVER, + i2c_bus->reg_base + AST2600_I2CM_IER); + + ret = devm_i2c_add_adapter(dev, &i2c_bus->adap); + if (ret) + return ret; + + return 0; +} + +static void ast2600_i2c_remove(struct platform_device *pdev) +{ + struct ast2600_i2c_bus *i2c_bus = platform_get_drvdata(pdev); + + /* Disable everything. */ + writel(0, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL); + writel(0, i2c_bus->reg_base + AST2600_I2CM_IER); +} + +static const struct of_device_id ast2600_i2c_bus_of_table[] = { + { + .compatible = "aspeed,ast2600-i2cv2", + }, + {} +}; +MODULE_DEVICE_TABLE(of, ast2600_i2c_bus_of_table); + +static struct platform_driver ast2600_i2c_bus_driver = { + .probe = ast2600_i2c_probe, + .remove = ast2600_i2c_remove, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = ast2600_i2c_bus_of_table, + }, +}; + +module_platform_driver(ast2600_i2c_bus_driver); + +MODULE_AUTHOR("Ryan Chen "); +MODULE_DESCRIPTION("ASPEED AST2600 I2C Controller Driver"); +MODULE_LICENSE("GPL"); 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: 13823998 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 1334ECFB440 for ; Mon, 7 Oct 2024 03:58:05 +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; 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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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241006_205249_181354_0FD11C8D X-CRM114-Status: GOOD ( 17.61 ) 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 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;