From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1UAPMb-0003ES-Vw for barebox@lists.infradead.org; Tue, 26 Feb 2013 18:34:56 +0000 From: Marc Kleine-Budde Date: Tue, 26 Feb 2013 19:34:50 +0100 Message-Id: <1361903690-30420-3-git-send-email-mkl@pengutronix.de> In-Reply-To: <1361903690-30420-1-git-send-email-mkl@pengutronix.de> References: <1361903690-30420-1-git-send-email-mkl@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 2/2] driver/serial: add driver for the mxs application uart To: barebox@lists.infradead.org Signed-off-by: Marc Kleine-Budde --- drivers/serial/Makefile | 1 + drivers/serial/serial_auart.c | 257 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 258 insertions(+) create mode 100644 drivers/serial/serial_auart.c diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 893e282..6b90593 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -21,3 +21,4 @@ obj-$(CONFIG_DRIVER_SERIAL_ALTERA) += serial_altera.o obj-$(CONFIG_DRIVER_SERIAL_ALTERA_JTAG) += serial_altera_jtag.o obj-$(CONFIG_DRIVER_SERIAL_PXA) += serial_pxa.o obj-$(CONFIG_DRIVER_SERIAL_OMAP4_USBBOOT) += serial_omap4_usbboot.o +obj-$(CONFIG_DRIVER_SERIAL_AUART) += serial_auart.o diff --git a/drivers/serial/serial_auart.c b/drivers/serial/serial_auart.c new file mode 100644 index 0000000..5208a5d --- /dev/null +++ b/drivers/serial/serial_auart.c @@ -0,0 +1,257 @@ +/* + * (C) 2013 Marc Kleine-Budde + * + * Based on the stm-serial driver: + * + * (C) Copyright 2010 Juergen Beisert - Pengutronix + * + * ...also based on the u-boot auart driver: + * + * (C) 2011 Wolfgang Ocker + * + * Based on the standard DUART serial driver: + * + * (C) 2007 Sascha Hauer + * + * (C) Copyright 2009-2010 Freescale Semiconductor, Inc. + * + * Further based on the Linux mxs-auart.c driver: + * + * Freescale STMP37XX/STMP378X Application UART driver + * + * Author: dmitry pervushin + * + * Copyright 2008-2010 Freescale Semiconductor, Inc. + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include + +#include +#include + +#define HW_UARTAPP_CTRL0 (0x00000000) +#define HW_UARTAPP_CTRL0_CLR (0x00000008) +#define BM_UARTAPP_CTRL0_SFTRST (0x80000000) +#define BM_UARTAPP_CTRL0_CLKGATE (0x40000000) + +#define HW_UARTAPP_CTRL2 (0x00000020) +#define HW_UARTAPP_CTRL2_SET (0x00000024) +#define HW_UARTAPP_CTRL2_CLR (0x00000028) +#define BM_UARTAPP_CTRL2_CTSEN (0x00008000) +#define BM_UARTAPP_CTRL2_RTSEN (0x00004000) +#define BM_UARTAPP_CTRL2_RXE (0x00000200) +#define BM_UARTAPP_CTRL2_TXE (0x00000100) +#define BM_UARTAPP_CTRL2_USE_LCR2 (0x00000040) +#define BM_UARTAPP_CTRL2_UARTEN (0x00000001) + +#define HW_UARTAPP_LINECTRL (0x00000030) +#define BM_UARTAPP_LINECTRL_FEN (0x00000010) + +#define BM_UARTAPP_LINECTRL_BAUD_DIVFRAC (0x00003F00) +#define BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(v) \ + (((v) << 8) & BM_UARTAPP_LINECTRL_BAUD_DIVFRAC) + +#define BP_UARTAPP_LINECTRL_BAUD_DIVINT (16) +#define BM_UARTAPP_LINECTRL_BAUD_DIVINT (0xFFFF0000) +#define BF_UARTAPP_LINECTRL_BAUD_DIVINT(v) \ + (((v) << 16) & BM_UARTAPP_LINECTRL_BAUD_DIVINT) + +#define BP_UARTAPP_LINECTRL_WLEN (5) +#define BM_UARTAPP_LINECTRL_WLEN (0x00000060) +#define BF_UARTAPP_LINECTRL_WLEN(v) \ + (((v) << 5) & BM_UARTAPP_LINECTRL_WLEN) + +#define HW_UARTAPP_LINECTRL2_SET (0x00000044) + +#define HW_UARTAPP_INTR (0x00000050) + +#define HW_UARTAPP_DATA (0x00000060) +#define BM_UARTAPP_STAT_RXFE (0x01000000) +#define BM_UARTAPP_STAT_TXFE (0x08000000) + +#define HW_UARTAPP_STAT (0x00000070) +#define BM_UARTAPP_STAT_TXFF (0x02000000) + +struct auart_priv { + struct console_device cdev; + int baudrate; + struct notifier_block notify; + void __iomem *base; +}; + +static void auart_serial_putc(struct console_device *cdev, char c) +{ + struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev); + + /* Wait for room in TX FIFO */ + while (readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFF) + ; + + writel(c, priv->base + HW_UARTAPP_DATA); +} + +static int auart_serial_tstc(struct console_device *cdev) +{ + struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev); + + /* Check if RX FIFO is not empty */ + return !(readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_RXFE); +} + +static int auart_serial_getc(struct console_device *cdev) +{ + struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev); + + /* Wait while TX FIFO is empty */ + while (!auart_serial_tstc(cdev)) + ; + + return readl(priv->base + HW_UARTAPP_DATA) & 0xff; +} + +static void auart_serial_flush(struct console_device *cdev) +{ + struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev); + + /* Wait for TX FIFO empty */ + while (readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFE) + ; +} + +static int auart_serial_setbaudrate(struct console_device *cdev, int new_baudrate) +{ + struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev); + uint32_t ctrl2, quot, reg; + + /* Disable everything */ + ctrl2 = readl(priv->base + HW_UARTAPP_CTRL2); + writel(0x0, priv->base + HW_UARTAPP_CTRL2); + + /* Calculate and set baudrate */ + quot = (imx_get_xclk() * 32) / new_baudrate; + reg = BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(quot & 0x3F) | + BF_UARTAPP_LINECTRL_BAUD_DIVINT(quot >> 6) | + BF_UARTAPP_LINECTRL_WLEN(3) | + BM_UARTAPP_LINECTRL_FEN; + + writel(reg, priv->base + HW_UARTAPP_LINECTRL); + + /* Re-enable debug UART */ + writel(ctrl2, priv->base + HW_UARTAPP_CTRL2); + + priv->baudrate = new_baudrate; + + return 0; +} + +static int auart_clocksource_clock_change(struct notifier_block *nb, unsigned long event, void *data) +{ + struct auart_priv *priv = container_of(nb, struct auart_priv, notify); + + return auart_serial_setbaudrate(&priv->cdev, priv->baudrate); +} + +static void auart_reset(struct auart_priv *priv) +{ + int i; + + writel(BM_UARTAPP_CTRL0_SFTRST, priv->base + HW_UARTAPP_CTRL0_CLR); + + for (i = 0; i < 10000; i++) { + uint32_t reg; + + reg = readl(priv->base + HW_UARTAPP_CTRL0); + if (!(reg & BM_UARTAPP_CTRL0_SFTRST)) + break; + } + + writel(BM_UARTAPP_CTRL0_CLKGATE, priv->base + HW_UARTAPP_CTRL0_CLR); +} + +static void auart_serial_init_port(struct auart_priv *priv) +{ + auart_reset(priv); + + /* Disable UART */ + writel(0x0, priv->base + HW_UARTAPP_CTRL2); + /* Mask interrupts */ + writel(0x0, priv->base + HW_UARTAPP_INTR); +} + +static int auart_serial_probe(struct device_d *dev) +{ + struct auart_priv *priv; + struct console_device *cdev; + + priv = xzalloc(sizeof *priv); + cdev = &priv->cdev; + + cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR; + cdev->tstc = auart_serial_tstc; + cdev->putc = auart_serial_putc; + cdev->getc = auart_serial_getc; + cdev->flush = auart_serial_flush; + cdev->setbrg = auart_serial_setbaudrate; + cdev->dev = dev; + + dev->priv = priv; + priv->base = dev_request_mem_region(dev, 0); + + auart_serial_init_port(priv); + auart_serial_setbaudrate(cdev, CONFIG_BAUDRATE); + + /* Disable RTS/CTS, enable Rx, Tx, UART */ + writel(BM_UARTAPP_CTRL2_RTSEN | BM_UARTAPP_CTRL2_CTSEN | + BM_UARTAPP_CTRL2_USE_LCR2, + priv->base + HW_UARTAPP_CTRL2_CLR); + writel(BM_UARTAPP_CTRL2_RXE | BM_UARTAPP_CTRL2_TXE | + BM_UARTAPP_CTRL2_UARTEN, + priv->base + HW_UARTAPP_CTRL2_SET); + + console_register(cdev); + priv->notify.notifier_call = auart_clocksource_clock_change; + clock_register_client(&priv->notify); + + return 0; +} + + +static void auart_serial_remove(struct device_d *dev) +{ + struct auart_priv *priv = dev->priv; + + auart_serial_flush(&priv->cdev); + console_unregister(&priv->cdev); + free(priv); +} + +static struct driver_d auart_serial_driver = { + .name = "auart_serial", + .probe = auart_serial_probe, + .remove = auart_serial_remove, +}; + +static int auart_serial_init(void) +{ + platform_driver_register(&auart_serial_driver); + return 0; +} + +console_initcall(auart_serial_init); -- 1.7.10.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox