From patchwork Fri Apr 14 07:01:27 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wenyou Yang X-Patchwork-Id: 750755 X-Patchwork-Delegate: sjg@chromium.org Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.denx.de (dione.denx.de [81.169.180.215]) by ozlabs.org (Postfix) with ESMTP id 3w482N6kn9z9sDG for ; Fri, 14 Apr 2017 17:10:52 +1000 (AEST) Received: by lists.denx.de (Postfix, from userid 105) id A0B1EC21D0D; Fri, 14 Apr 2017 07:10:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lists.denx.de X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=unavailable autolearn_force=no version=3.4.0 Received: from lists.denx.de (localhost [IPv6:::1]) by lists.denx.de (Postfix) with ESMTP id ECEE0C21CE4; Fri, 14 Apr 2017 07:10:05 +0000 (UTC) Received: by lists.denx.de (Postfix, from userid 105) id D40F9C21C95; Fri, 14 Apr 2017 07:09:41 +0000 (UTC) Received: from eusmtp01.atmel.com (eusmtp01.atmel.com [212.144.249.242]) by lists.denx.de (Postfix) with ESMTPS id 929BBC21CDF for ; Fri, 14 Apr 2017 07:09:38 +0000 (UTC) Received: from apsmtp01.atmel.com (10.168.254.30) by eusmtp01.atmel.com (10.145.145.30) with Microsoft SMTP Server id 14.3.235.1; Fri, 14 Apr 2017 09:09:27 +0200 Received: from shaarm01.corp.atmel.com (10.168.254.13) by apsmtp01.corp.atmel.com (10.168.254.30) with Microsoft SMTP Server id 14.3.235.1; Fri, 14 Apr 2017 15:15:17 +0800 From: Wenyou Yang To: U-Boot Mailing List Date: Fri, 14 Apr 2017 15:01:27 +0800 Message-ID: <20170414070128.21325-2-wenyou.yang@atmel.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170414070128.21325-1-wenyou.yang@atmel.com> References: <20170414070128.21325-1-wenyou.yang@atmel.com> MIME-Version: 1.0 Cc: Tom Rini Subject: [U-Boot] [PATCH v3 1/2] serial: atmel_usart: Fix early debug not work in SPL X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.18 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" Add the uart init function to be used on both probe and the early debug uart init. For the latter, the input clock should be from CONFIG_DEBUG_UART_CLOCK. Signed-off-by: Wenyou Yang Reviewed-by: Simon Glass Signed-off-by: Wenyou Yang Reviewed-by: Simon Glass --- Changes in v3: None Changes in v2: None drivers/serial/atmel_usart.c | 36 +++++++++++++++++++++++++++++++----- 1 file changed, 31 insertions(+), 5 deletions(-) diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c index 7674f97e8d..8b1e0d55a4 100644 --- a/drivers/serial/atmel_usart.c +++ b/drivers/serial/atmel_usart.c @@ -25,6 +25,7 @@ DECLARE_GLOBAL_DATA_PTR; +#ifndef CONFIG_DM_SERIAL static void atmel_serial_setbrg_internal(atmel_usart3_t *usart, int id, int baudrate) { @@ -66,7 +67,6 @@ static void atmel_serial_activate(atmel_usart3_t *usart) __udelay(100); } -#ifndef CONFIG_DM_SERIAL static void atmel_serial_setbrg(void) { atmel_serial_setbrg_internal((atmel_usart3_t *)CONFIG_USART_BASE, @@ -138,12 +138,37 @@ struct atmel_serial_priv { atmel_usart3_t *usart; }; +static void _atmel_serial_set_brg(atmel_usart3_t *usart, + ulong usart_clk_rate, int baudrate) +{ + unsigned long divisor; + + divisor = (usart_clk_rate / 16 + baudrate / 2) / baudrate; + writel(USART3_BF(CD, divisor), &usart->brgr); +} + +void _atmel_serial_init(atmel_usart3_t *usart, + ulong usart_clk_rate, int baudrate) +{ + writel(USART3_BIT(RXDIS) | USART3_BIT(TXDIS), &usart->cr); + + writel((USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL) | + USART3_BF(USCLKS, USART3_USCLKS_MCK) | + USART3_BF(CHRL, USART3_CHRL_8) | + USART3_BF(PAR, USART3_PAR_NONE) | + USART3_BF(NBSTOP, USART3_NBSTOP_1)), &usart->mr); + + _atmel_serial_set_brg(usart, usart_clk_rate, baudrate); + + writel(USART3_BIT(RSTRX) | USART3_BIT(RSTTX), &usart->cr); + writel(USART3_BIT(RXEN) | USART3_BIT(TXEN), &usart->cr); +} + int atmel_serial_setbrg(struct udevice *dev, int baudrate) { struct atmel_serial_priv *priv = dev_get_priv(dev); - atmel_serial_setbrg_internal(priv->usart, 0 /* ignored */, baudrate); - atmel_serial_activate(priv->usart); + _atmel_serial_set_brg(priv->usart, get_usart_clk_rate(0), baudrate); return 0; } @@ -202,7 +227,8 @@ static int atmel_serial_probe(struct udevice *dev) plat->base_addr = (uint32_t)addr_base; #endif priv->usart = (atmel_usart3_t *)plat->base_addr; - atmel_serial_init_internal(priv->usart); + + _atmel_serial_init(priv->usart, get_usart_clk_rate(0), gd->baudrate); return 0; } @@ -233,7 +259,7 @@ static inline void _debug_uart_init(void) { atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_DEBUG_UART_BASE; - atmel_serial_setbrg_internal(usart, 0, CONFIG_BAUDRATE); + _atmel_serial_init(usart, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE); } static inline void _debug_uart_putc(int ch)