303 lines
7.0 KiB
C
303 lines
7.0 KiB
C
/*
|
|
* (c) 2004 Sascha Hauer <sascha@saschahauer.de>
|
|
*
|
|
* 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 <common.h>
|
|
#include <driver.h>
|
|
#include <init.h>
|
|
#include <malloc.h>
|
|
#include <notifier.h>
|
|
#include <io.h>
|
|
#include <of.h>
|
|
#include <linux/err.h>
|
|
#include <linux/clk.h>
|
|
#include <serial/imx-uart.h>
|
|
|
|
/*
|
|
* create default values for different platforms
|
|
*/
|
|
struct imx_serial_devtype_data {
|
|
u32 ucr1_val;
|
|
u32 ucr3_val;
|
|
u32 ucr4_val;
|
|
u32 uts;
|
|
u32 onems;
|
|
};
|
|
|
|
static struct imx_serial_devtype_data imx1_data = {
|
|
.ucr1_val = UCR1_UARTCLKEN,
|
|
.ucr3_val = 0,
|
|
.ucr4_val = UCR4_CTSTL_32 | UCR4_REF16,
|
|
.uts = 0xd0,
|
|
.onems = 0,
|
|
};
|
|
|
|
static struct imx_serial_devtype_data imx21_data = {
|
|
.ucr1_val = 0,
|
|
.ucr3_val = 0x700 | UCR3_RXDMUXSEL | UCR3_ADNIMP,
|
|
.ucr4_val = UCR4_CTSTL_32,
|
|
.uts = 0xb4,
|
|
.onems = 0xb0,
|
|
};
|
|
|
|
struct imx_serial_priv {
|
|
struct console_device cdev;
|
|
int baudrate;
|
|
struct notifier_block notify;
|
|
void __iomem *regs;
|
|
struct clk *clk;
|
|
struct imx_serial_devtype_data *devtype;
|
|
};
|
|
|
|
static int imx_serial_reffreq(struct imx_serial_priv *priv)
|
|
{
|
|
ulong rfdiv;
|
|
|
|
rfdiv = (readl(priv->regs + UFCR) >> 7) & 7;
|
|
rfdiv = rfdiv < 6 ? 6 - rfdiv : 7;
|
|
|
|
return clk_get_rate(priv->clk) / rfdiv;
|
|
}
|
|
|
|
/*
|
|
* Initialise the serial port with the given baudrate. The settings
|
|
* are always 8 data bits, no parity, 1 stop bit, no start bits.
|
|
*
|
|
*/
|
|
static int imx_serial_init_port(struct console_device *cdev)
|
|
{
|
|
struct imx_serial_priv *priv = container_of(cdev,
|
|
struct imx_serial_priv, cdev);
|
|
void __iomem *regs = priv->regs;
|
|
uint32_t val;
|
|
|
|
writel(priv->devtype->ucr1_val, regs + UCR1);
|
|
writel(UCR2_WS | UCR2_IRTS, regs + UCR2);
|
|
writel(priv->devtype->ucr3_val, regs + UCR3);
|
|
writel(priv->devtype->ucr4_val, regs + UCR4);
|
|
writel(0x0000002B, regs + UESC);
|
|
writel(0, regs + UTIM);
|
|
writel(0, regs + UBIR);
|
|
writel(0, regs + UBMR);
|
|
writel(0, regs + priv->devtype->uts);
|
|
|
|
|
|
/* Configure FIFOs */
|
|
writel(0xa81, regs + UFCR);
|
|
|
|
|
|
if (priv->devtype->onems)
|
|
writel(imx_serial_reffreq(priv) / 1000, regs + priv->devtype->onems);
|
|
|
|
/* Enable FIFOs */
|
|
val = readl(regs + UCR2);
|
|
val |= UCR2_SRST | UCR2_RXEN | UCR2_TXEN;
|
|
writel(val, regs + UCR2);
|
|
|
|
/* Clear status flags */
|
|
val = readl(regs + USR2);
|
|
val |= USR2_ADET | USR2_DTRF | USR2_IDLE | USR2_IRINT | USR2_WAKE |
|
|
USR2_RTSF | USR2_BRCD | USR2_ORE | USR2_RDR;
|
|
writel(val, regs + USR2);
|
|
|
|
/* Clear status flags */
|
|
val = readl(regs + USR1);
|
|
val |= USR1_PARITYERR | USR1_RTSD | USR1_ESCF | USR1_FRAMERR | USR1_AIRINT |
|
|
USR1_AWAKE;
|
|
writel(val, regs + USR1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void imx_serial_putc(struct console_device *cdev, char c)
|
|
{
|
|
struct imx_serial_priv *priv = container_of(cdev,
|
|
struct imx_serial_priv, cdev);
|
|
|
|
/* Wait for Tx FIFO not full */
|
|
while (readl(priv->regs + priv->devtype->uts) & UTS_TXFULL);
|
|
|
|
writel(c, priv->regs + URTX0);
|
|
}
|
|
|
|
static int imx_serial_tstc(struct console_device *cdev)
|
|
{
|
|
struct imx_serial_priv *priv = container_of(cdev,
|
|
struct imx_serial_priv, cdev);
|
|
|
|
/* If receive fifo is empty, return false */
|
|
if (readl(priv->regs + priv->devtype->uts) & UTS_RXEMPTY)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int imx_serial_getc(struct console_device *cdev)
|
|
{
|
|
struct imx_serial_priv *priv = container_of(cdev,
|
|
struct imx_serial_priv, cdev);
|
|
unsigned char ch;
|
|
|
|
while (readl(priv->regs + priv->devtype->uts) & UTS_RXEMPTY);
|
|
|
|
ch = readl(priv->regs + URXD0);
|
|
|
|
return ch;
|
|
}
|
|
|
|
static void imx_serial_flush(struct console_device *cdev)
|
|
{
|
|
struct imx_serial_priv *priv = container_of(cdev,
|
|
struct imx_serial_priv, cdev);
|
|
|
|
while (!(readl(priv->regs + USR2) & USR2_TXDC));
|
|
}
|
|
|
|
static int imx_serial_setbaudrate(struct console_device *cdev, int baudrate)
|
|
{
|
|
struct imx_serial_priv *priv = container_of(cdev,
|
|
struct imx_serial_priv, cdev);
|
|
void __iomem *regs = priv->regs;
|
|
uint32_t val;
|
|
uint32_t ucr1 = readl(regs + UCR1);
|
|
|
|
/* disable UART */
|
|
val = readl(regs + UCR1);
|
|
val &= ~UCR1_UARTEN;
|
|
writel(val, regs + UCR1);
|
|
|
|
/* Set the numerator value minus one of the BRM ratio */
|
|
writel(baudrate_to_ubir(baudrate), regs + UBIR);
|
|
/* Set the denominator value minus one of the BRM ratio */
|
|
writel(refclock_to_ubmr(imx_serial_reffreq(priv)), regs + UBMR);
|
|
|
|
writel(ucr1, regs + UCR1);
|
|
|
|
priv->baudrate = baudrate;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx_clocksource_clock_change(struct notifier_block *nb,
|
|
unsigned long event, void *data)
|
|
{
|
|
struct imx_serial_priv *priv = container_of(nb,
|
|
struct imx_serial_priv, notify);
|
|
|
|
imx_serial_setbaudrate(&priv->cdev, priv->baudrate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx_serial_probe(struct device_d *dev)
|
|
{
|
|
struct console_device *cdev;
|
|
struct imx_serial_priv *priv;
|
|
uint32_t val;
|
|
struct imx_serial_devtype_data *devtype;
|
|
int ret;
|
|
const char *devname;
|
|
|
|
ret = dev_get_drvdata(dev, (const void **)&devtype);
|
|
if (ret)
|
|
return ret;
|
|
|
|
priv = xzalloc(sizeof(*priv));
|
|
priv->devtype = devtype;
|
|
cdev = &priv->cdev;
|
|
dev->priv = priv;
|
|
|
|
priv->clk = clk_get(dev, "per");
|
|
if (IS_ERR(priv->clk)) {
|
|
ret = PTR_ERR(priv->clk);
|
|
goto err_free;
|
|
}
|
|
|
|
priv->regs = dev_request_mem_region(dev, 0);
|
|
cdev->dev = dev;
|
|
cdev->tstc = imx_serial_tstc;
|
|
cdev->putc = imx_serial_putc;
|
|
cdev->getc = imx_serial_getc;
|
|
cdev->flush = imx_serial_flush;
|
|
cdev->setbrg = imx_serial_setbaudrate;
|
|
cdev->linux_console_name = "ttymxc";
|
|
if (dev->device_node) {
|
|
devname = of_alias_get(dev->device_node);
|
|
if (devname) {
|
|
cdev->devname = xstrdup(devname);
|
|
cdev->devid = DEVICE_ID_SINGLE;
|
|
}
|
|
}
|
|
|
|
imx_serial_init_port(cdev);
|
|
|
|
/* Enable UART */
|
|
val = readl(priv->regs + UCR1);
|
|
val |= UCR1_UARTEN;
|
|
writel(val, priv->regs + UCR1);
|
|
|
|
console_register(cdev);
|
|
priv->notify.notifier_call = imx_clocksource_clock_change;
|
|
clock_register_client(&priv->notify);
|
|
|
|
return 0;
|
|
|
|
err_free:
|
|
free(priv);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void imx_serial_remove(struct device_d *dev)
|
|
{
|
|
struct imx_serial_priv *priv = dev->priv;
|
|
|
|
imx_serial_flush(&priv->cdev);
|
|
console_unregister(&priv->cdev);
|
|
free(priv);
|
|
}
|
|
|
|
static __maybe_unused struct of_device_id imx_serial_dt_ids[] = {
|
|
{
|
|
.compatible = "fsl,imx1-uart",
|
|
.data = &imx1_data,
|
|
}, {
|
|
.compatible = "fsl,imx21-uart",
|
|
.data = &imx21_data,
|
|
}, {
|
|
/* sentinel */
|
|
}
|
|
};
|
|
|
|
static struct platform_device_id imx_serial_ids[] = {
|
|
{
|
|
.name = "imx1-uart",
|
|
.driver_data = (unsigned long)&imx1_data,
|
|
}, {
|
|
.name = "imx21-uart",
|
|
.driver_data = (unsigned long)&imx21_data,
|
|
}, {
|
|
/* sentinel */
|
|
},
|
|
};
|
|
|
|
static struct driver_d imx_serial_driver = {
|
|
.name = "imx_serial",
|
|
.probe = imx_serial_probe,
|
|
.remove = imx_serial_remove,
|
|
.of_compatible = DRV_OF_COMPAT(imx_serial_dt_ids),
|
|
.id_table = imx_serial_ids,
|
|
};
|
|
console_platform_driver(imx_serial_driver);
|