From patchwork Mon Feb 1 17:19:03 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liguo Zhang X-Patchwork-Id: 576889 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id C623C1401E7 for ; Tue, 2 Feb 2016 12:19:42 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751770AbcBBBTl (ORCPT ); Mon, 1 Feb 2016 20:19:41 -0500 Received: from mailgw02.mediatek.com ([210.61.82.184]:1765 "EHLO mailgw02.hq.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751938AbcBBBTk (ORCPT ); Mon, 1 Feb 2016 20:19:40 -0500 Received: from mtkhts09.mediatek.inc [(172.21.101.70)] by mailgw02.hq.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 2102207548; Tue, 02 Feb 2016 09:19:36 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkhts09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.266.1; Tue, 2 Feb 2016 09:19:33 +0800 From: Liguo Zhang To: Wolfram Sang CC: , Matthias Brugger , Eddie Huang , Xudong Chen , Sascha Hauer , , , , , Liguo Zhang Subject: [PATCH v6] i2c: mt8173: add 4GB mode support in i2c driver. Date: Tue, 2 Feb 2016 01:19:03 +0800 Message-ID: <1454347143-31461-1-git-send-email-liguo.zhang@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty MIME-Version: 1.0 X-MTK: N Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org If 4GB mode is enable, we should add 4gb mode support in i2c driver. Set 4GB mode register to support 4GB mode. Signed-off-by: Liguo Zhang Reviewed-by: Daniel Kurtz Reviewed-by: Yingjoe Chen --- change in v6: Remove unnecessary init for reg_4g_mode. change in v5: Use BIT_ULL() to fix kernel building warning. change in v4: Use BIT_ULL() to fix kernel building warning. change in v3: Only inline the computation of reg_4g_mode in mtk_i2c_set_4g_mode(). change in v2: Define a static inline function mtk_i2c_set_4g_mode() for support 4g mode. --- drivers/i2c/busses/i2c-mt65xx.c | 42 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index aec8e6c..453358b 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -60,6 +60,7 @@ #define I2C_DMA_INT_FLAG_NONE 0x0000 #define I2C_DMA_CLR_FLAG 0x0000 #define I2C_DMA_HARD_RST 0x0002 +#define I2C_DMA_4G_MODE 0x0001 #define I2C_DEFAULT_SPEED 100000 /* hz */ #define MAX_FS_MODE_SPEED 400000 @@ -88,6 +89,8 @@ enum DMA_REGS_OFFSET { OFFSET_RX_MEM_ADDR = 0x20, OFFSET_TX_LEN = 0x24, OFFSET_RX_LEN = 0x28, + OFFSET_TX_4G_MODE = 0x54, + OFFSET_RX_4G_MODE = 0x58, }; enum i2c_trans_st_rs { @@ -133,6 +136,7 @@ struct mtk_i2c_compatible { unsigned char dcm: 1; unsigned char auto_restart: 1; unsigned char aux_len_reg: 1; + unsigned char support_33bits: 1; }; struct mtk_i2c { @@ -182,6 +186,7 @@ static const struct mtk_i2c_compatible mt6577_compat = { .dcm = 1, .auto_restart = 0, .aux_len_reg = 0, + .support_33bits = 0, }; static const struct mtk_i2c_compatible mt6589_compat = { @@ -190,6 +195,7 @@ static const struct mtk_i2c_compatible mt6589_compat = { .dcm = 0, .auto_restart = 0, .aux_len_reg = 0, + .support_33bits = 0, }; static const struct mtk_i2c_compatible mt8173_compat = { @@ -198,6 +204,7 @@ static const struct mtk_i2c_compatible mt8173_compat = { .dcm = 1, .auto_restart = 1, .aux_len_reg = 1, + .support_33bits = 1, }; static const struct of_device_id mtk_i2c_of_match[] = { @@ -366,6 +373,11 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk, return 0; } +static inline u32 mtk_i2c_set_4g_mode(dma_addr_t addr) +{ + return (addr & BIT_ULL(32)) ? I2C_DMA_4G_MODE : I2C_DMA_CLR_FLAG; +} + static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, int num, int left_num) { @@ -373,6 +385,7 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, u16 start_reg; u16 control_reg; u16 restart_flag = 0; + u32 reg_4g_mode; dma_addr_t rpaddr = 0; dma_addr_t wpaddr = 0; int ret; @@ -439,6 +452,12 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, msgs->len, DMA_FROM_DEVICE); if (dma_mapping_error(i2c->dev, rpaddr)) return -ENOMEM; + + if (i2c->dev_comp->support_33bits) { + reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr); + writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE); + } + writel((u32)rpaddr, i2c->pdmabase + OFFSET_RX_MEM_ADDR); writel(msgs->len, i2c->pdmabase + OFFSET_RX_LEN); } else if (i2c->op == I2C_MASTER_WR) { @@ -448,6 +467,12 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, msgs->len, DMA_TO_DEVICE); if (dma_mapping_error(i2c->dev, wpaddr)) return -ENOMEM; + + if (i2c->dev_comp->support_33bits) { + reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr); + writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE); + } + writel((u32)wpaddr, i2c->pdmabase + OFFSET_TX_MEM_ADDR); writel(msgs->len, i2c->pdmabase + OFFSET_TX_LEN); } else { @@ -465,6 +490,15 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, msgs->len, DMA_TO_DEVICE); return -ENOMEM; } + + if (i2c->dev_comp->support_33bits) { + reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr); + writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE); + + reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr); + writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE); + } + writel((u32)wpaddr, i2c->pdmabase + OFFSET_TX_MEM_ADDR); writel((u32)rpaddr, i2c->pdmabase + OFFSET_RX_MEM_ADDR); writel(msgs->len, i2c->pdmabase + OFFSET_TX_LEN); @@ -729,6 +763,14 @@ static int mtk_i2c_probe(struct platform_device *pdev) return -EINVAL; } + if (i2c->dev_comp->support_33bits) { + ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(33)); + if (ret) { + dev_err(&pdev->dev, "dma_set_mask return error.\n"); + return ret; + } + } + ret = mtk_i2c_clock_enable(i2c); if (ret) { dev_err(&pdev->dev, "clock enable failed!\n");