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/* GRLIB APBUART Serial controller driver
*
* (C) Copyright 2007, 2015
* Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <ambapp.h>
#include <grlib/apbuart.h>
#include <serial.h>
#include <watchdog.h>
DECLARE_GLOBAL_DATA_PTR;
/* Select which UART that will become u-boot console */
#ifndef CONFIG_SYS_GRLIB_APBUART_INDEX
#define CONFIG_SYS_GRLIB_APBUART_INDEX 0
#endif
static unsigned apbuart_calc_scaler(unsigned apbuart_freq, unsigned baud)
{
return (((apbuart_freq * 10) / (baud * 8)) - 5) / 10;
}
static int leon3_serial_init(void)
{
ambapp_dev_apbuart *uart;
ambapp_apbdev apbdev;
unsigned int tmp;
/* find UART */
if (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER, GAISLER_APBUART,
CONFIG_SYS_GRLIB_APBUART_INDEX, &apbdev) != 1) {
gd->flags &= ~GD_FLG_SERIAL_READY;
panic("%s: apbuart not found!\n", __func__);
return -1; /* didn't find hardware */
}
/* found apbuart, let's init .. */
uart = (ambapp_dev_apbuart *) apbdev.address;
/* APBUART Frequency is equal to bus frequency */
gd->arch.uart_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
/* Set scaler / baud rate */
tmp = apbuart_calc_scaler(gd->arch.uart_freq, CONFIG_BAUDRATE);
writel(tmp, &uart->scaler);
/* Let bit 11 be unchanged (debug bit for GRMON) */
tmp = readl(&uart->ctrl) & APBUART_CTRL_DBG;
/* Receiver & transmitter enable */
tmp |= APBUART_CTRL_RE | APBUART_CTRL_TE;
writel(tmp, &uart->ctrl);
gd->arch.uart = uart;
return 0;
}
static inline ambapp_dev_apbuart *leon3_get_uart_regs(void)
{
ambapp_dev_apbuart *uart = gd->arch.uart;
return uart;
}
static void leon3_serial_putc_raw(const char c)
{
ambapp_dev_apbuart * const uart = leon3_get_uart_regs();
if (!uart)
return;
/* Wait for last character to go. */
while (!(readl(&uart->status) & APBUART_STATUS_THE))
WATCHDOG_RESET();
/* Send data */
writel(c, &uart->data);
#ifdef LEON_DEBUG
/* Wait for data to be sent */
while (!(readl(&uart->status) & APBUART_STATUS_TSE))
WATCHDOG_RESET();
#endif
}
static void leon3_serial_putc(const char c)
{
if (c == '\n')
leon3_serial_putc_raw('\r');
leon3_serial_putc_raw(c);
}
static int leon3_serial_getc(void)
{
ambapp_dev_apbuart * const uart = leon3_get_uart_regs();
if (!uart)
return 0;
/* Wait for a character to arrive. */
while (!(readl(&uart->status) & APBUART_STATUS_DR))
WATCHDOG_RESET();
/* Read character data */
return readl(&uart->data);
}
static int leon3_serial_tstc(void)
{
ambapp_dev_apbuart * const uart = leon3_get_uart_regs();
if (!uart)
return 0;
return readl(&uart->status) & APBUART_STATUS_DR;
}
/* set baud rate for uart */
static void leon3_serial_setbrg(void)
{
ambapp_dev_apbuart * const uart = leon3_get_uart_regs();
unsigned int scaler;
if (!uart)
return;
if (!gd->baudrate)
gd->baudrate = CONFIG_BAUDRATE;
if (!gd->arch.uart_freq)
gd->arch.uart_freq = CONFIG_SYS_CLK_FREQ;
scaler = apbuart_calc_scaler(gd->arch.uart_freq, gd->baudrate);
writel(scaler, &uart->scaler);
}
static struct serial_device leon3_serial_drv = {
.name = "leon3_serial",
.start = leon3_serial_init,
.stop = NULL,
.setbrg = leon3_serial_setbrg,
.putc = leon3_serial_putc,
.puts = default_serial_puts,
.getc = leon3_serial_getc,
.tstc = leon3_serial_tstc,
};
void leon3_serial_initialize(void)
{
serial_register(&leon3_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &leon3_serial_drv;
}
#ifdef CONFIG_DEBUG_UART_APBUART
#include <debug_uart.h>
static inline void _debug_uart_init(void)
{
ambapp_dev_apbuart *uart = (ambapp_dev_apbuart *)CONFIG_DEBUG_UART_BASE;
uart->scaler = apbuart_calc_scaler(CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
uart->ctrl = APBUART_CTRL_RE | APBUART_CTRL_TE;
}
static inline void _debug_uart_putc(int ch)
{
ambapp_dev_apbuart *uart = (ambapp_dev_apbuart *)CONFIG_DEBUG_UART_BASE;
while (!(readl(&uart->status) & APBUART_STATUS_THE))
WATCHDOG_RESET();
writel(ch, &uart->data);
}
DEBUG_UART_FUNCS
#endif
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