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https://github.com/smaeul/u-boot.git
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1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
155 lines
3.5 KiB
C
155 lines
3.5 KiB
C
/* GRLIB APBUART Serial controller driver
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*
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* (C) Copyright 2008
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* Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/processor.h>
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#include <asm/leon.h>
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#include <serial.h>
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#include <linux/compiler.h>
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DECLARE_GLOBAL_DATA_PTR;
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static int leon2_serial_init(void)
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{
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LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
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LEON2_Uart_regs *regs;
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unsigned int tmp;
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/* Init LEON2 UART
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*
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* Set scaler / baud rate
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*
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* Receiver & transmitter enable
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*/
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#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1;
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#else
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2;
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#endif
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regs->UART_Scaler = CONFIG_SYS_LEON2_UART1_SCALER;
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/* Let bit 11 be unchanged (debug bit for GRMON) */
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tmp = READ_WORD(regs->UART_Control);
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regs->UART_Control = ((tmp & LEON2_UART_CTRL_DBG) |
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(LEON2_UART1_LOOPBACK_ENABLE << 7) |
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(LEON2_UART1_FLOWCTRL_ENABLE << 6) |
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(LEON2_UART1_PARITY_ENABLE << 5) |
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(LEON2_UART1_ODDPAR_ENABLE << 4) |
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LEON2_UART_CTRL_RE | LEON2_UART_CTRL_TE);
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return 0;
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}
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static void leon2_serial_putc_raw(const char c)
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{
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LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
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LEON2_Uart_regs *regs;
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#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1;
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#else
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2;
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#endif
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/* Wait for last character to go. */
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while (!(READ_WORD(regs->UART_Status) & LEON2_UART_STAT_THE)) ;
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/* Send data */
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regs->UART_Channel = c;
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#ifdef LEON_DEBUG
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/* Wait for data to be sent */
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while (!(READ_WORD(regs->UART_Status) & LEON2_UART_STAT_TSE)) ;
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#endif
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}
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static void leon2_serial_putc(const char c)
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{
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if (c == '\n')
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leon2_serial_putc_raw('\r');
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leon2_serial_putc_raw(c);
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}
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static int leon2_serial_getc(void)
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{
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LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
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LEON2_Uart_regs *regs;
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#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1;
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#else
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2;
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#endif
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/* Wait for a character to arrive. */
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while (!(READ_WORD(regs->UART_Status) & LEON2_UART_STAT_DR)) ;
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/* read data */
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return READ_WORD(regs->UART_Channel);
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}
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static int leon2_serial_tstc(void)
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{
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LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
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LEON2_Uart_regs *regs;
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#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1;
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#else
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2;
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#endif
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return (READ_WORD(regs->UART_Status) & LEON2_UART_STAT_DR);
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}
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/* set baud rate for uart */
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static void leon2_serial_setbrg(void)
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{
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/* update baud rate settings, read it from gd->baudrate */
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unsigned int scaler;
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LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
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LEON2_Uart_regs *regs;
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#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1;
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#else
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regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2;
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#endif
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if (gd->baudrate > 0) {
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scaler =
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(((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) -
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5) / 10;
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regs->UART_Scaler = scaler;
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}
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}
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static struct serial_device leon2_serial_drv = {
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.name = "leon2_serial",
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.start = leon2_serial_init,
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.stop = NULL,
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.setbrg = leon2_serial_setbrg,
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.putc = leon2_serial_putc,
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.puts = default_serial_puts,
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.getc = leon2_serial_getc,
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.tstc = leon2_serial_tstc,
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};
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void leon2_serial_initialize(void)
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{
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serial_register(&leon2_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &leon2_serial_drv;
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}
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