mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-02 17:41:08 +00:00
8a8d24bdf1
Try to maintain some consistency between these variables by using _plat as a suffix for them. Signed-off-by: Simon Glass <sjg@chromium.org>
342 lines
7.7 KiB
C
342 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Marius Groeger <mgroeger@sysgo.de>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Alex Zuepke <azu@sysgo.de>
|
|
*
|
|
* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
|
|
*
|
|
* Modified to add driver model (DM) support
|
|
* (C) Copyright 2016 Marcel Ziswiler <marcel.ziswiler@toradex.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <hang.h>
|
|
#include <asm/arch/pxa-regs.h>
|
|
#include <asm/arch/regs-uart.h>
|
|
#include <asm/io.h>
|
|
#include <dm.h>
|
|
#include <dm/platform_data/serial_pxa.h>
|
|
#include <linux/compiler.h>
|
|
#include <serial.h>
|
|
#include <watchdog.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
static uint32_t pxa_uart_get_baud_divider(int baudrate)
|
|
{
|
|
return 921600 / baudrate;
|
|
}
|
|
|
|
static void pxa_uart_toggle_clock(uint32_t uart_index, int enable)
|
|
{
|
|
uint32_t clk_reg, clk_offset, reg;
|
|
|
|
clk_reg = UART_CLK_REG;
|
|
clk_offset = UART_CLK_BASE << uart_index;
|
|
|
|
reg = readl(clk_reg);
|
|
|
|
if (enable)
|
|
reg |= clk_offset;
|
|
else
|
|
reg &= ~clk_offset;
|
|
|
|
writel(reg, clk_reg);
|
|
}
|
|
|
|
/*
|
|
* Enable clock and set baud rate, parity etc.
|
|
*/
|
|
void pxa_setbrg_common(struct pxa_uart_regs *uart_regs, int port, int baudrate)
|
|
{
|
|
uint32_t divider = pxa_uart_get_baud_divider(baudrate);
|
|
if (!divider)
|
|
hang();
|
|
|
|
|
|
pxa_uart_toggle_clock(port, 1);
|
|
|
|
/* Disable interrupts and FIFOs */
|
|
writel(0, &uart_regs->ier);
|
|
writel(0, &uart_regs->fcr);
|
|
|
|
/* Set baud rate */
|
|
writel(LCR_WLS0 | LCR_WLS1 | LCR_DLAB, &uart_regs->lcr);
|
|
writel(divider & 0xff, &uart_regs->dll);
|
|
writel(divider >> 8, &uart_regs->dlh);
|
|
writel(LCR_WLS0 | LCR_WLS1, &uart_regs->lcr);
|
|
|
|
/* Enable UART */
|
|
writel(IER_UUE, &uart_regs->ier);
|
|
}
|
|
|
|
#ifndef CONFIG_DM_SERIAL
|
|
static struct pxa_uart_regs *pxa_uart_index_to_regs(uint32_t uart_index)
|
|
{
|
|
switch (uart_index) {
|
|
case FFUART_INDEX: return (struct pxa_uart_regs *)FFUART_BASE;
|
|
case BTUART_INDEX: return (struct pxa_uart_regs *)BTUART_BASE;
|
|
case STUART_INDEX: return (struct pxa_uart_regs *)STUART_BASE;
|
|
case HWUART_INDEX: return (struct pxa_uart_regs *)HWUART_BASE;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Enable clock and set baud rate, parity etc.
|
|
*/
|
|
void pxa_setbrg_dev(uint32_t uart_index)
|
|
{
|
|
struct pxa_uart_regs *uart_regs = pxa_uart_index_to_regs(uart_index);
|
|
if (!uart_regs)
|
|
panic("Failed getting UART registers\n");
|
|
|
|
pxa_setbrg_common(uart_regs, uart_index, gd->baudrate);
|
|
}
|
|
|
|
/*
|
|
* Initialise the serial port with the given baudrate. The settings
|
|
* are always 8 data bits, no parity, 1 stop bit, no start bits.
|
|
*/
|
|
int pxa_init_dev(unsigned int uart_index)
|
|
{
|
|
pxa_setbrg_dev(uart_index);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Output a single byte to the serial port.
|
|
*/
|
|
void pxa_putc_dev(unsigned int uart_index, const char c)
|
|
{
|
|
struct pxa_uart_regs *uart_regs;
|
|
|
|
/* If \n, also do \r */
|
|
if (c == '\n')
|
|
pxa_putc_dev(uart_index, '\r');
|
|
|
|
uart_regs = pxa_uart_index_to_regs(uart_index);
|
|
if (!uart_regs)
|
|
hang();
|
|
|
|
while (!(readl(&uart_regs->lsr) & LSR_TEMT))
|
|
WATCHDOG_RESET();
|
|
writel(c, &uart_regs->thr);
|
|
}
|
|
|
|
/*
|
|
* Read a single byte from the serial port. Returns 1 on success, 0
|
|
* otherwise. When the function is succesfull, the character read is
|
|
* written into its argument c.
|
|
*/
|
|
int pxa_tstc_dev(unsigned int uart_index)
|
|
{
|
|
struct pxa_uart_regs *uart_regs;
|
|
|
|
uart_regs = pxa_uart_index_to_regs(uart_index);
|
|
if (!uart_regs)
|
|
return -1;
|
|
|
|
return readl(&uart_regs->lsr) & LSR_DR;
|
|
}
|
|
|
|
/*
|
|
* Read a single byte from the serial port. Returns 1 on success, 0
|
|
* otherwise. When the function is succesfull, the character read is
|
|
* written into its argument c.
|
|
*/
|
|
int pxa_getc_dev(unsigned int uart_index)
|
|
{
|
|
struct pxa_uart_regs *uart_regs;
|
|
|
|
uart_regs = pxa_uart_index_to_regs(uart_index);
|
|
if (!uart_regs)
|
|
return -1;
|
|
|
|
while (!(readl(&uart_regs->lsr) & LSR_DR))
|
|
WATCHDOG_RESET();
|
|
return readl(&uart_regs->rbr) & 0xff;
|
|
}
|
|
|
|
void pxa_puts_dev(unsigned int uart_index, const char *s)
|
|
{
|
|
while (*s)
|
|
pxa_putc_dev(uart_index, *s++);
|
|
}
|
|
|
|
#define pxa_uart(uart, UART) \
|
|
int uart##_init(void) \
|
|
{ \
|
|
return pxa_init_dev(UART##_INDEX); \
|
|
} \
|
|
\
|
|
void uart##_setbrg(void) \
|
|
{ \
|
|
return pxa_setbrg_dev(UART##_INDEX); \
|
|
} \
|
|
\
|
|
void uart##_putc(const char c) \
|
|
{ \
|
|
return pxa_putc_dev(UART##_INDEX, c); \
|
|
} \
|
|
\
|
|
void uart##_puts(const char *s) \
|
|
{ \
|
|
return pxa_puts_dev(UART##_INDEX, s); \
|
|
} \
|
|
\
|
|
int uart##_getc(void) \
|
|
{ \
|
|
return pxa_getc_dev(UART##_INDEX); \
|
|
} \
|
|
\
|
|
int uart##_tstc(void) \
|
|
{ \
|
|
return pxa_tstc_dev(UART##_INDEX); \
|
|
} \
|
|
|
|
#define pxa_uart_desc(uart) \
|
|
struct serial_device serial_##uart##_device = \
|
|
{ \
|
|
.name = "serial_"#uart, \
|
|
.start = uart##_init, \
|
|
.stop = NULL, \
|
|
.setbrg = uart##_setbrg, \
|
|
.getc = uart##_getc, \
|
|
.tstc = uart##_tstc, \
|
|
.putc = uart##_putc, \
|
|
.puts = uart##_puts, \
|
|
};
|
|
|
|
#define pxa_uart_multi(uart, UART) \
|
|
pxa_uart(uart, UART) \
|
|
pxa_uart_desc(uart)
|
|
|
|
#if defined(CONFIG_HWUART)
|
|
pxa_uart_multi(hwuart, HWUART)
|
|
#endif
|
|
#if defined(CONFIG_STUART)
|
|
pxa_uart_multi(stuart, STUART)
|
|
#endif
|
|
#if defined(CONFIG_FFUART)
|
|
pxa_uart_multi(ffuart, FFUART)
|
|
#endif
|
|
#if defined(CONFIG_BTUART)
|
|
pxa_uart_multi(btuart, BTUART)
|
|
#endif
|
|
|
|
__weak struct serial_device *default_serial_console(void)
|
|
{
|
|
#if CONFIG_CONS_INDEX == 1
|
|
return &serial_hwuart_device;
|
|
#elif CONFIG_CONS_INDEX == 2
|
|
return &serial_stuart_device;
|
|
#elif CONFIG_CONS_INDEX == 3
|
|
return &serial_ffuart_device;
|
|
#elif CONFIG_CONS_INDEX == 4
|
|
return &serial_btuart_device;
|
|
#else
|
|
#error "Bad CONFIG_CONS_INDEX."
|
|
#endif
|
|
}
|
|
|
|
void pxa_serial_initialize(void)
|
|
{
|
|
#if defined(CONFIG_FFUART)
|
|
serial_register(&serial_ffuart_device);
|
|
#endif
|
|
#if defined(CONFIG_BTUART)
|
|
serial_register(&serial_btuart_device);
|
|
#endif
|
|
#if defined(CONFIG_STUART)
|
|
serial_register(&serial_stuart_device);
|
|
#endif
|
|
}
|
|
#endif /* CONFIG_DM_SERIAL */
|
|
|
|
#ifdef CONFIG_DM_SERIAL
|
|
static int pxa_serial_probe(struct udevice *dev)
|
|
{
|
|
struct pxa_serial_plat *plat = dev->plat;
|
|
|
|
pxa_setbrg_common((struct pxa_uart_regs *)plat->base, plat->port,
|
|
plat->baudrate);
|
|
return 0;
|
|
}
|
|
|
|
static int pxa_serial_putc(struct udevice *dev, const char ch)
|
|
{
|
|
struct pxa_serial_plat *plat = dev->plat;
|
|
struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
|
|
|
|
/* Wait for last character to go. */
|
|
if (!(readl(&uart_regs->lsr) & LSR_TEMT))
|
|
return -EAGAIN;
|
|
|
|
writel(ch, &uart_regs->thr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pxa_serial_getc(struct udevice *dev)
|
|
{
|
|
struct pxa_serial_plat *plat = dev->plat;
|
|
struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
|
|
|
|
/* Wait for a character to arrive. */
|
|
if (!(readl(&uart_regs->lsr) & LSR_DR))
|
|
return -EAGAIN;
|
|
|
|
return readl(&uart_regs->rbr) & 0xff;
|
|
}
|
|
|
|
int pxa_serial_setbrg(struct udevice *dev, int baudrate)
|
|
{
|
|
struct pxa_serial_plat *plat = dev->plat;
|
|
struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
|
|
int port = plat->port;
|
|
|
|
pxa_setbrg_common(uart_regs, port, baudrate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pxa_serial_pending(struct udevice *dev, bool input)
|
|
{
|
|
struct pxa_serial_plat *plat = dev->plat;
|
|
struct pxa_uart_regs *uart_regs = (struct pxa_uart_regs *)plat->base;
|
|
|
|
if (input)
|
|
return readl(&uart_regs->lsr) & LSR_DR ? 1 : 0;
|
|
else
|
|
return readl(&uart_regs->lsr) & LSR_TEMT ? 0 : 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_serial_ops pxa_serial_ops = {
|
|
.putc = pxa_serial_putc,
|
|
.pending = pxa_serial_pending,
|
|
.getc = pxa_serial_getc,
|
|
.setbrg = pxa_serial_setbrg,
|
|
};
|
|
|
|
U_BOOT_DRIVER(serial_pxa) = {
|
|
.name = "serial_pxa",
|
|
.id = UCLASS_SERIAL,
|
|
.probe = pxa_serial_probe,
|
|
.ops = &pxa_serial_ops,
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
};
|
|
#endif /* CONFIG_DM_SERIAL */
|