u-boot/drivers/serial/mcfuart.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

229 lines
5.1 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2004-2007 Freescale Semiconductor, Inc.
* TsiChung Liew, Tsi-Chung.Liew@freescale.com.
*
* Modified to add device model (DM) support
* (C) Copyright 2015 Angelo Dureghello <angelo@sysam.it>
*/
/*
* Minimal serial functions needed to use one of the uart ports
* as serial console interface.
*/
#include <common.h>
#include <dm.h>
#include <dm/platform_data/serial_coldfire.h>
#include <serial.h>
#include <linux/compiler.h>
#include <asm/immap.h>
#include <asm/uart.h>
DECLARE_GLOBAL_DATA_PTR;
extern void uart_port_conf(int port);
static int mcf_serial_init_common(uart_t *uart, int port_idx, int baudrate)
{
u32 counter;
uart_port_conf(port_idx);
/* write to SICR: SIM2 = uart mode,dcd does not affect rx */
writeb(UART_UCR_RESET_RX, &uart->ucr);
writeb(UART_UCR_RESET_TX, &uart->ucr);
writeb(UART_UCR_RESET_ERROR, &uart->ucr);
writeb(UART_UCR_RESET_MR, &uart->ucr);
__asm__("nop");
writeb(0, &uart->uimr);
/* write to CSR: RX/TX baud rate from timers */
writeb(UART_UCSR_RCS_SYS_CLK | UART_UCSR_TCS_SYS_CLK, &uart->ucsr);
writeb(UART_UMR_BC_8 | UART_UMR_PM_NONE, &uart->umr);
writeb(UART_UMR_SB_STOP_BITS_1, &uart->umr);
/* Setting up BaudRate */
counter = (u32) ((gd->bus_clk / 32) + (baudrate / 2));
counter = counter / baudrate;
/* write to CTUR: divide counter upper byte */
writeb((u8)((counter & 0xff00) >> 8), &uart->ubg1);
/* write to CTLR: divide counter lower byte */
writeb((u8)(counter & 0x00ff), &uart->ubg2);
writeb(UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED, &uart->ucr);
return (0);
}
static void mcf_serial_setbrg_common(uart_t *uart, int baudrate)
{
u32 counter;
/* Setting up BaudRate */
counter = (u32) ((gd->bus_clk / 32) + (baudrate / 2));
counter = counter / baudrate;
/* write to CTUR: divide counter upper byte */
writeb(((counter & 0xff00) >> 8), &uart->ubg1);
/* write to CTLR: divide counter lower byte */
writeb((counter & 0x00ff), &uart->ubg2);
writeb(UART_UCR_RESET_RX, &uart->ucr);
writeb(UART_UCR_RESET_TX, &uart->ucr);
writeb(UART_UCR_RX_ENABLED | UART_UCR_TX_ENABLED, &uart->ucr);
}
#ifndef CONFIG_DM_SERIAL
static int mcf_serial_init(void)
{
uart_t *uart_base;
int port_idx;
uart_base = (uart_t *)CONFIG_SYS_UART_BASE;
port_idx = CONFIG_SYS_UART_PORT;
return mcf_serial_init_common(uart_base, port_idx, gd->baudrate);
}
static void mcf_serial_putc(const char c)
{
uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;
if (c == '\n')
serial_putc('\r');
/* Wait for last character to go. */
while (!(readb(&uart->usr) & UART_USR_TXRDY))
;
writeb(c, &uart->utb);
}
static int mcf_serial_getc(void)
{
uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;
/* Wait for a character to arrive. */
while (!(readb(&uart->usr) & UART_USR_RXRDY))
;
return readb(&uart->urb);
}
static void mcf_serial_setbrg(void)
{
uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;
mcf_serial_setbrg_common(uart, gd->baudrate);
}
static int mcf_serial_tstc(void)
{
uart_t *uart = (uart_t *)CONFIG_SYS_UART_BASE;
return readb(&uart->usr) & UART_USR_RXRDY;
}
static struct serial_device mcf_serial_drv = {
.name = "mcf_serial",
.start = mcf_serial_init,
.stop = NULL,
.setbrg = mcf_serial_setbrg,
.putc = mcf_serial_putc,
.puts = default_serial_puts,
.getc = mcf_serial_getc,
.tstc = mcf_serial_tstc,
};
void mcf_serial_initialize(void)
{
serial_register(&mcf_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &mcf_serial_drv;
}
#endif
#ifdef CONFIG_DM_SERIAL
static int coldfire_serial_probe(struct udevice *dev)
{
struct coldfire_serial_platdata *plat = dev->platdata;
return mcf_serial_init_common((uart_t *)plat->base,
plat->port, plat->baudrate);
}
static int coldfire_serial_putc(struct udevice *dev, const char ch)
{
struct coldfire_serial_platdata *plat = dev->platdata;
uart_t *uart = (uart_t *)plat->base;
/* Wait for last character to go. */
if (!(readb(&uart->usr) & UART_USR_TXRDY))
return -EAGAIN;
writeb(ch, &uart->utb);
return 0;
}
static int coldfire_serial_getc(struct udevice *dev)
{
struct coldfire_serial_platdata *plat = dev->platdata;
uart_t *uart = (uart_t *)(plat->base);
/* Wait for a character to arrive. */
if (!(readb(&uart->usr) & UART_USR_RXRDY))
return -EAGAIN;
return readb(&uart->urb);
}
int coldfire_serial_setbrg(struct udevice *dev, int baudrate)
{
struct coldfire_serial_platdata *plat = dev->platdata;
uart_t *uart = (uart_t *)(plat->base);
mcf_serial_setbrg_common(uart, baudrate);
return 0;
}
static int coldfire_serial_pending(struct udevice *dev, bool input)
{
struct coldfire_serial_platdata *plat = dev->platdata;
uart_t *uart = (uart_t *)(plat->base);
if (input)
return readb(&uart->usr) & UART_USR_RXRDY ? 1 : 0;
else
return readb(&uart->usr) & UART_USR_TXRDY ? 0 : 1;
return 0;
}
static const struct dm_serial_ops coldfire_serial_ops = {
.putc = coldfire_serial_putc,
.pending = coldfire_serial_pending,
.getc = coldfire_serial_getc,
.setbrg = coldfire_serial_setbrg,
};
U_BOOT_DRIVER(serial_coldfire) = {
.name = "serial_coldfire",
.id = UCLASS_SERIAL,
.probe = coldfire_serial_probe,
.ops = &coldfire_serial_ops,
.flags = DM_FLAG_PRE_RELOC,
};
#endif