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serial/serial_arc - add driver for ARC UART

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Driver for non-standard on-chip UART, instantiated in the ARC (Synopsys)
FPGA Boards such as ARCAngel4/ML50x

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

Cc: Mischa Jonker <mjonker@synopsys.com>
Cc: Francois Bedard <fbedard@synopsys.com>
Cc: Tom Rini <trini@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Alexey Brodkin 2013-12-13 10:35:11 +04:00 committed by Tom Rini
parent 1a78d28d02
commit 22a240c32c
3 changed files with 108 additions and 0 deletions
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1
drivers/serial/Makefile
View file

@ -34,6 +34,7 @@ obj-$(CONFIG_ZYNQ_SERIAL) += serial_zynq.o
obj-$(CONFIG_BFIN_SERIAL) += serial_bfin.o
obj-$(CONFIG_FSL_LPUART) += serial_lpuart.o
obj-$(CONFIG_MXS_AUART) += mxs_auart.o
obj-$(CONFIG_ARC_SERIAL) += serial_arc.o
ifndef CONFIG_SPL_BUILD
obj-$(CONFIG_USB_TTY) += usbtty.o

2
drivers/serial/serial.c
View file

@ -160,6 +160,7 @@ serial_initfunc(sa1100_serial_initialize);
serial_initfunc(sh_serial_initialize);
serial_initfunc(arm_dcc_initialize);
serial_initfunc(mxs_auart_initialize);
serial_initfunc(arc_serial_initialize);
/**
* serial_register() - Register serial driver with serial driver core
@ -253,6 +254,7 @@ void serial_initialize(void)
sh_serial_initialize();
arm_dcc_initialize();
mxs_auart_initialize();
arc_serial_initialize();
serial_assign(default_serial_console()->name);
}

105
drivers/serial/serial_arc.c Normal file
View file

@ -0,0 +1,105 @@
/*
* Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <common.h>
#include <serial.h>
DECLARE_GLOBAL_DATA_PTR;
struct arc_serial_regs {
unsigned int id0;
unsigned int id1;
unsigned int id2;
unsigned int id3;
unsigned int data;
unsigned int status;
unsigned int baudl;
unsigned int baudh;
};
/* Bit definitions of STATUS register */
#define UART_RXEMPTY (1 << 5)
#define UART_OVERFLOW_ERR (1 << 1)
#define UART_TXEMPTY (1 << 7)
struct arc_serial_regs *regs;
static void arc_serial_setbrg(void)
{
int arc_console_baud;
if (!gd->baudrate)
gd->baudrate = CONFIG_BAUDRATE;
arc_console_baud = gd->cpu_clk / (gd->baudrate * 4) - 1;
writel(arc_console_baud & 0xff, &regs->baudl);
writel((arc_console_baud & 0xff00) >> 8, &regs->baudh);
}
static int arc_serial_init(void)
{
regs = (struct arc_serial_regs *)CONFIG_ARC_UART_BASE;
serial_setbrg();
return 0;
}
static void arc_serial_putc(const char c)
{
if (c == '\n')
arc_serial_putc('\r');
while (!(readl(&regs->status) & UART_TXEMPTY))
;
writel(c, &regs->data);
}
static int arc_serial_tstc(void)
{
return !(readl(&regs->status) & UART_RXEMPTY);
}
static int arc_serial_getc(void)
{
while (!arc_serial_tstc())
;
/* Check for overflow errors */
if (readl(&regs->status) & UART_OVERFLOW_ERR)
return 0;
return readl(&regs->data) & 0xFF;
}
static void arc_serial_puts(const char *s)
{
while (*s)
arc_serial_putc(*s++);
}
static struct serial_device arc_serial_drv = {
.name = "arc_serial",
.start = arc_serial_init,
.stop = NULL,
.setbrg = arc_serial_setbrg,
.putc = arc_serial_putc,
.puts = arc_serial_puts,
.getc = arc_serial_getc,
.tstc = arc_serial_tstc,
};
void arc_serial_initialize(void)
{
serial_register(&arc_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &arc_serial_drv;
}