236 lines
6.4 KiB
C
236 lines
6.4 KiB
C
/*
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* (C) 2013 Marc Kleine-Budde <mkl@pengutronix.de>
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*
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* Based on the stm-serial driver:
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*
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* (C) Copyright 2010 Juergen Beisert - Pengutronix
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*
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* ...also based on the u-boot auart driver:
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*
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* (C) 2011 Wolfgang Ocker <weo@reccoware.de>
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*
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* Based on the standard DUART serial driver:
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*
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* (C) 2007 Sascha Hauer <s.hauer@pengutronix.de>
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*
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* (C) Copyright 2009-2010 Freescale Semiconductor, Inc.
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*
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* Further based on the Linux mxs-auart.c driver:
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*
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* Freescale STMP37XX/STMP378X Application UART driver
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*
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* Author: dmitry pervushin <dimka@embeddedalley.com>
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*
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* Copyright 2008-2010 Freescale Semiconductor, Inc.
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* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <gpio.h>
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#include <init.h>
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#include <io.h>
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#include <malloc.h>
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#include <notifier.h>
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#include <stmp-device.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <mach/clock.h>
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#include <mach/imx-regs.h>
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#define HW_UARTAPP_CTRL0 (0x00000000)
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#define HW_UARTAPP_CTRL2 (0x00000020)
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#define HW_UARTAPP_CTRL2_SET (0x00000024)
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#define HW_UARTAPP_CTRL2_CLR (0x00000028)
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#define BM_UARTAPP_CTRL2_CTSEN (0x00008000)
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#define BM_UARTAPP_CTRL2_RTSEN (0x00004000)
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#define BM_UARTAPP_CTRL2_RXE (0x00000200)
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#define BM_UARTAPP_CTRL2_TXE (0x00000100)
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#define BM_UARTAPP_CTRL2_USE_LCR2 (0x00000040)
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#define BM_UARTAPP_CTRL2_UARTEN (0x00000001)
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#define HW_UARTAPP_LINECTRL (0x00000030)
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#define BM_UARTAPP_LINECTRL_FEN (0x00000010)
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#define BM_UARTAPP_LINECTRL_BAUD_DIVFRAC (0x00003F00)
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#define BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(v) \
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(((v) << 8) & BM_UARTAPP_LINECTRL_BAUD_DIVFRAC)
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#define BP_UARTAPP_LINECTRL_BAUD_DIVINT (16)
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#define BM_UARTAPP_LINECTRL_BAUD_DIVINT (0xFFFF0000)
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#define BF_UARTAPP_LINECTRL_BAUD_DIVINT(v) \
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(((v) << 16) & BM_UARTAPP_LINECTRL_BAUD_DIVINT)
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#define BP_UARTAPP_LINECTRL_WLEN (5)
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#define BM_UARTAPP_LINECTRL_WLEN (0x00000060)
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#define BF_UARTAPP_LINECTRL_WLEN(v) \
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(((v) << 5) & BM_UARTAPP_LINECTRL_WLEN)
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#define HW_UARTAPP_LINECTRL2_SET (0x00000044)
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#define HW_UARTAPP_INTR (0x00000050)
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#define HW_UARTAPP_DATA (0x00000060)
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#define BM_UARTAPP_STAT_RXFE (0x01000000)
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#define BM_UARTAPP_STAT_TXFE (0x08000000)
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#define HW_UARTAPP_STAT (0x00000070)
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#define BM_UARTAPP_STAT_TXFF (0x02000000)
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struct auart_priv {
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struct console_device cdev;
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int baudrate;
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struct notifier_block notify;
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void __iomem *base;
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struct clk *clk;
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};
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static void auart_serial_putc(struct console_device *cdev, char c)
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{
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struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
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/* Wait for room in TX FIFO */
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while (readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFF)
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;
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writel(c, priv->base + HW_UARTAPP_DATA);
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}
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static int auart_serial_tstc(struct console_device *cdev)
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{
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struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
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/* Check if RX FIFO is not empty */
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return !(readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_RXFE);
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}
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static int auart_serial_getc(struct console_device *cdev)
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{
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struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
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/* Wait while RX FIFO is empty */
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while (!auart_serial_tstc(cdev))
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;
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return readl(priv->base + HW_UARTAPP_DATA) & 0xff;
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}
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static void auart_serial_flush(struct console_device *cdev)
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{
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struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
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/* Wait for TX FIFO empty */
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while (!(readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFE))
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;
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}
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static int auart_serial_setbaudrate(struct console_device *cdev, int new_baudrate)
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{
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struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
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uint32_t ctrl2, quot, reg;
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/* Disable everything */
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ctrl2 = readl(priv->base + HW_UARTAPP_CTRL2);
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writel(0x0, priv->base + HW_UARTAPP_CTRL2);
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/* Calculate and set baudrate */
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quot = (clk_get_rate(priv->clk) * 32) / new_baudrate;
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reg = BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(quot & 0x3F) |
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BF_UARTAPP_LINECTRL_BAUD_DIVINT(quot >> 6) |
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BF_UARTAPP_LINECTRL_WLEN(3) |
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BM_UARTAPP_LINECTRL_FEN;
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writel(reg, priv->base + HW_UARTAPP_LINECTRL);
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/* Re-enable UART */
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writel(ctrl2, priv->base + HW_UARTAPP_CTRL2);
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priv->baudrate = new_baudrate;
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return 0;
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}
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static int auart_clocksource_clock_change(struct notifier_block *nb, unsigned long event, void *data)
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{
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struct auart_priv *priv = container_of(nb, struct auart_priv, notify);
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return auart_serial_setbaudrate(&priv->cdev, priv->baudrate);
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}
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static void auart_serial_init_port(struct auart_priv *priv)
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{
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stmp_reset_block(priv->base + HW_UARTAPP_CTRL0, 0);
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/* Disable UART */
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writel(0x0, priv->base + HW_UARTAPP_CTRL2);
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/* Mask interrupts */
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writel(0x0, priv->base + HW_UARTAPP_INTR);
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}
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static int auart_serial_probe(struct device_d *dev)
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{
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struct auart_priv *priv;
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struct console_device *cdev;
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priv = xzalloc(sizeof *priv);
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cdev = &priv->cdev;
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cdev->tstc = auart_serial_tstc;
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cdev->putc = auart_serial_putc;
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cdev->getc = auart_serial_getc;
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cdev->flush = auart_serial_flush;
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cdev->setbrg = auart_serial_setbaudrate;
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cdev->dev = dev;
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dev->priv = priv;
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priv->base = dev_request_mem_region(dev, 0);
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priv->clk = clk_get(dev, NULL);
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if (IS_ERR(priv->clk))
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return PTR_ERR(priv->clk);
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auart_serial_init_port(priv);
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/* Disable RTS/CTS, enable Rx, Tx, UART */
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writel(BM_UARTAPP_CTRL2_RTSEN | BM_UARTAPP_CTRL2_CTSEN |
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BM_UARTAPP_CTRL2_USE_LCR2,
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priv->base + HW_UARTAPP_CTRL2_CLR);
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writel(BM_UARTAPP_CTRL2_RXE | BM_UARTAPP_CTRL2_TXE |
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BM_UARTAPP_CTRL2_UARTEN,
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priv->base + HW_UARTAPP_CTRL2_SET);
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console_register(cdev);
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priv->notify.notifier_call = auart_clocksource_clock_change;
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clock_register_client(&priv->notify);
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return 0;
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}
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static void auart_serial_remove(struct device_d *dev)
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{
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struct auart_priv *priv = dev->priv;
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auart_serial_flush(&priv->cdev);
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console_unregister(&priv->cdev);
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free(priv);
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}
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static struct driver_d auart_serial_driver = {
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.name = "auart_serial",
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.probe = auart_serial_probe,
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.remove = auart_serial_remove,
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};
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console_platform_driver(auart_serial_driver);
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