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u-boot/drivers/serial/serial_pxa.c
Simon Glass db41d65a97 common: Move hang() to the same header as panic() 
At present panic() is in the vsprintf.h header file. That does not seem
like an obvious choice for hang(), even though it relates to panic(). So
let's put hang() in its own header.

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Migrate a few more files]
Signed-off-by: Tom Rini <trini@konsulko.com>
2020-01-17 17:53:40 -05:00

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7.8 KiB
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// 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_platdata *plat = dev->platdata;
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_platdata *plat = dev->platdata;
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_platdata *plat = dev->platdata;
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_platdata *plat = dev->platdata;
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_platdata *plat = dev->platdata;
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 */
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