From patchwork Sun Feb 20 03:53:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tyrone Ting X-Patchwork-Id: 544316 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 854EDC433F5 for ; Sun, 20 Feb 2022 03:57:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243461AbiBTD5y (ORCPT ); Sat, 19 Feb 2022 22:57:54 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:58396 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243460AbiBTD5o (ORCPT ); Sat, 19 Feb 2022 22:57:44 -0500 Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D869A4160F; Sat, 19 Feb 2022 19:57:23 -0800 (PST) Received: by mail-pl1-x62c.google.com with SMTP id u5so10250064ple.3; Sat, 19 Feb 2022 19:57:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=KMD0lMN6Iu67hNkeNrnkvAGmKOGIQFWemImlvh6Aswg=; b=PlvOcPC+Mk93GKAv++G+XpBRb883wEo+I8mxKRxKGUNBXzMCuZfVE5MYroZ5cVxMoX lPbGmJzqFYW5hiOGrKJKEdI6aodAtTPY52hyQT4HUtXHUSfSm5J5nWIol7D4sG4zRk6Y 6FlxVY2KKj1CnLiJl/JJls+eTUb6CA6wOsSa+gRTFZgeXWiEgduw0QevdcImfLTa+UhJ z/edHoHWQWA5d6ks4XBJIkPAQwMwHyQBoJpzaBtOr92TuDUrr14Dvqk24yF3NEG+PS8M AB9FCpXt2n5hVOv93xUQu9a6oLKMIMolbaXmIhtxXpwBHI2hU6IUriYnqaufNl9BPPOT azlw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=KMD0lMN6Iu67hNkeNrnkvAGmKOGIQFWemImlvh6Aswg=; b=NBjDlfJg2kWMXDZSR+LOs31dUxO3RfYEvL7VDwSwl8Ln7HGm+qI9FI5ijzwTOtrCxy 9sP5tgFtBwZUyGLhi0WBQv3+iAtSzz7R+UX4BbU8ISOpnZx7j2QskQ77cAi3jSHMNm8z gQLH0QfGzlZt0TBtiboLos0xLvmNen8biGJ6WSIJ/kxkaMWPsmvZ5eCZvHXHMQDQhqK6 SKlwlvduYcOyV8fmwy/VnbS6ZzsBLZTFBrsmp5qhKxSdfKhNsbtgUkZI5jbalTMSrI2P GljCZA3jJ+JjPv1pSGDe7iOCi/isshWW6zTB6jckVuwfkky0iNDDlvT3MS1ivWU41ubw fFog== X-Gm-Message-State: AOAM532HrHkk6FoliKGESyCjob+JACJPWJFH2RGD+BACDHEeD3Rg2CEJ EIaqLLsveU+bHmrjOjS18k4jcNIhU6VB X-Google-Smtp-Source: ABdhPJwwo5jbAb9oLdoLb6HDMQOuHrD2RUa/XN0xNskLK8TcRSv5XtOPJMvIalW2ZhMb5la0xesRMg== X-Received: by 2002:a17:90a:f482:b0:1bb:8504:864c with SMTP id bx2-20020a17090af48200b001bb8504864cmr19869296pjb.161.1645329443291; Sat, 19 Feb 2022 19:57:23 -0800 (PST) Received: from localhost ([2401:e180:8842:e799:9593:a6f2:788b:a48c]) by smtp.gmail.com with ESMTPSA id lb18sm3479878pjb.42.2022.02.19.19.57.22 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sat, 19 Feb 2022 19:57:22 -0800 (PST) From: Tyrone Ting To: avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, robh+dt@kernel.org, krzysztof.kozlowski@canonical.com, semen.protsenko@linaro.org, yangyicong@hisilicon.com, wsa@kernel.org, jie.deng@intel.com, sven@svenpeter.dev, bence98@sch.bme.hu, christophe.leroy@csgroup.eu, lukas.bulwahn@gmail.com, olof@lixom.net, arnd@arndb.de, digetx@gmail.com, andriy.shevchenko@linux.intel.com, warp5tw@gmail.com, tali.perry@nuvoton.com, Avi.Fishman@nuvoton.com, tomer.maimon@nuvoton.com, KWLIU@nuvoton.com, JJLIU0@nuvoton.com, kfting@nuvoton.com Cc: openbmc@lists.ozlabs.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 10/11] i2c: npcm: Remove own slave addresses 2:10 Date: Sun, 20 Feb 2022 11:53:20 +0800 Message-Id: <20220220035321.3870-11-warp5tw@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220220035321.3870-1-warp5tw@gmail.com> References: <20220220035321.3870-1-warp5tw@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: Tali Perry NPCM can support up to 10 own slave addresses. In practice, only one address is actually being used. In order to access addresses 2 and above, need to switch register banks. The switch needs spinlock. To avoid using spinlock for this useless feature removed support of SA >= 2. Also fix returned slave event enum. Remove some comment since the bank selection is not required. The bank selection is not required since the supported slave addresses are reduced. Fixes: 56a1485b102e ("i2c: npcm7xx: Add Nuvoton NPCM I2C controller driver") Signed-off-by: Tali Perry Signed-off-by: Tyrone Ting --- drivers/i2c/busses/i2c-npcm7xx.c | 46 ++++++++++++++++---------------- 1 file changed, 23 insertions(+), 23 deletions(-) diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c index a265f6fdbf5c..2cbf9c679aed 100644 --- a/drivers/i2c/busses/i2c-npcm7xx.c +++ b/drivers/i2c/busses/i2c-npcm7xx.c @@ -124,6 +124,8 @@ enum i2c_addr { * use this array to get the address or each register. */ #define I2C_NUM_OWN_ADDR 10 +#define I2C_NUM_OWN_ADDR_SUPPORTED 2 + static const int npcm_i2caddr[I2C_NUM_OWN_ADDR] = { NPCM_I2CADDR1, NPCM_I2CADDR2, NPCM_I2CADDR3, NPCM_I2CADDR4, NPCM_I2CADDR5, NPCM_I2CADDR6, NPCM_I2CADDR7, NPCM_I2CADDR8, @@ -392,14 +394,10 @@ static void npcm_i2c_disable(struct npcm_i2c *bus) #if IS_ENABLED(CONFIG_I2C_SLAVE) int i; - /* select bank 0 for I2C addresses */ - npcm_i2c_select_bank(bus, I2C_BANK_0); - /* Slave addresses removal */ - for (i = I2C_SLAVE_ADDR1; i < I2C_NUM_OWN_ADDR; i++) + for (i = I2C_SLAVE_ADDR1; i < I2C_NUM_OWN_ADDR_SUPPORTED; i++) iowrite8(0, bus->reg + npcm_i2caddr[i]); - npcm_i2c_select_bank(bus, I2C_BANK_1); #endif /* Disable module */ i2cctl2 = ioread8(bus->reg + NPCM_I2CCTL2); @@ -604,8 +602,7 @@ static int npcm_i2c_slave_enable(struct npcm_i2c *bus, enum i2c_addr addr_type, i2cctl1 &= ~NPCM_I2CCTL1_GCMEN; iowrite8(i2cctl1, bus->reg + NPCM_I2CCTL1); return 0; - } - if (addr_type == I2C_ARP_ADDR) { + } else if (addr_type == I2C_ARP_ADDR) { i2cctl3 = ioread8(bus->reg + NPCM_I2CCTL3); if (enable) i2cctl3 |= I2CCTL3_ARPMEN; @@ -614,16 +611,18 @@ static int npcm_i2c_slave_enable(struct npcm_i2c *bus, enum i2c_addr addr_type, iowrite8(i2cctl3, bus->reg + NPCM_I2CCTL3); return 0; } + if (addr_type > I2C_SLAVE_ADDR2 && addr_type <= I2C_SLAVE_ADDR10) { + dev_err(bus->dev, + "try to enable more then 2 SA not supported\n"); + } if (addr_type >= I2C_ARP_ADDR) return -EFAULT; /* select bank 0 for address 3 to 10 */ - if (addr_type > I2C_SLAVE_ADDR2) - npcm_i2c_select_bank(bus, I2C_BANK_0); + /* Set and enable the address */ iowrite8(sa_reg, bus->reg + npcm_i2caddr[addr_type]); npcm_i2c_slave_int_enable(bus, enable); - if (addr_type > I2C_SLAVE_ADDR2) - npcm_i2c_select_bank(bus, I2C_BANK_1); + return 0; } #endif @@ -846,15 +845,13 @@ static u8 npcm_i2c_get_slave_addr(struct npcm_i2c *bus, enum i2c_addr addr_type) { u8 slave_add; - /* select bank 0 for address 3 to 10 */ - if (addr_type > I2C_SLAVE_ADDR2) - npcm_i2c_select_bank(bus, I2C_BANK_0); + if (addr_type > I2C_SLAVE_ADDR2 && addr_type <= I2C_SLAVE_ADDR10) { + dev_err(bus->dev, + "get slave: try to use more then 2 slave addresses not supported\n"); + } slave_add = ioread8(bus->reg + npcm_i2caddr[(int)addr_type]); - if (addr_type > I2C_SLAVE_ADDR2) - npcm_i2c_select_bank(bus, I2C_BANK_1); - return slave_add; } @@ -864,12 +861,12 @@ static int npcm_i2c_remove_slave_addr(struct npcm_i2c *bus, u8 slave_add) /* Set the enable bit */ slave_add |= 0x80; - npcm_i2c_select_bank(bus, I2C_BANK_0); - for (i = I2C_SLAVE_ADDR1; i < I2C_NUM_OWN_ADDR; i++) { + + for (i = I2C_SLAVE_ADDR1; i < I2C_NUM_OWN_ADDR_SUPPORTED; i++) { if (ioread8(bus->reg + npcm_i2caddr[i]) == slave_add) iowrite8(0, bus->reg + npcm_i2caddr[i]); } - npcm_i2c_select_bank(bus, I2C_BANK_1); + return 0; } @@ -924,11 +921,15 @@ static int npcm_i2c_slave_get_wr_buf(struct npcm_i2c *bus) for (i = 0; i < I2C_HW_FIFO_SIZE; i++) { if (bus->slv_wr_size >= I2C_HW_FIFO_SIZE) break; - i2c_slave_event(bus->slave, I2C_SLAVE_READ_REQUESTED, &value); + if (bus->state == I2C_SLAVE_MATCH) { + i2c_slave_event(bus->slave, I2C_SLAVE_READ_REQUESTED, &value); + bus->state = I2C_OPER_STARTED; + } else { + i2c_slave_event(bus->slave, I2C_SLAVE_READ_PROCESSED, &value); + } ind = (bus->slv_wr_ind + bus->slv_wr_size) % I2C_HW_FIFO_SIZE; bus->slv_wr_buf[ind] = value; bus->slv_wr_size++; - i2c_slave_event(bus->slave, I2C_SLAVE_READ_PROCESSED, &value); } return I2C_HW_FIFO_SIZE - ret; } @@ -976,7 +977,6 @@ static void npcm_i2c_slave_xmit(struct npcm_i2c *bus, u16 nwrite, if (nwrite == 0) return; - bus->state = I2C_OPER_STARTED; bus->operation = I2C_WRITE_OPER; /* get the next buffer */