mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 04:23:46 +00:00
a821c4af79
These support the flat device tree. We want to use the dev_read_..() prefix for functions that support both flat tree and live tree. So rename the existing functions to avoid confusion. In the end we will have: 1. dev_read_addr...() - works on devices, supports flat/live tree 2. devfdt_get_addr...() - current functions, flat tree only 3. of_get_address() etc. - new functions, live tree only All drivers will be written to use 1. That function will in turn call either 2 or 3 depending on whether the flat or live tree is in use. Note this involves changing some dead code - the imx_lpi2c.c file. Signed-off-by: Simon Glass <sjg@chromium.org>
132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
/*
|
|
* 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 <dm.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;
|
|
};
|
|
|
|
|
|
struct arc_serial_platdata {
|
|
struct arc_serial_regs *reg;
|
|
unsigned int uartclk;
|
|
};
|
|
|
|
/* Bit definitions of STATUS register */
|
|
#define UART_RXEMPTY (1 << 5)
|
|
#define UART_OVERFLOW_ERR (1 << 1)
|
|
#define UART_TXEMPTY (1 << 7)
|
|
|
|
static int arc_serial_setbrg(struct udevice *dev, int baudrate)
|
|
{
|
|
struct arc_serial_platdata *plat = dev->platdata;
|
|
struct arc_serial_regs *const regs = plat->reg;
|
|
int arc_console_baud = gd->cpu_clk / (baudrate * 4) - 1;
|
|
|
|
writeb(arc_console_baud & 0xff, ®s->baudl);
|
|
writeb((arc_console_baud & 0xff00) >> 8, ®s->baudh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int arc_serial_putc(struct udevice *dev, const char c)
|
|
{
|
|
struct arc_serial_platdata *plat = dev->platdata;
|
|
struct arc_serial_regs *const regs = plat->reg;
|
|
|
|
while (!(readb(®s->status) & UART_TXEMPTY))
|
|
;
|
|
|
|
writeb(c, ®s->data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int arc_serial_tstc(struct arc_serial_regs *const regs)
|
|
{
|
|
return !(readb(®s->status) & UART_RXEMPTY);
|
|
}
|
|
|
|
static int arc_serial_pending(struct udevice *dev, bool input)
|
|
{
|
|
struct arc_serial_platdata *plat = dev->platdata;
|
|
struct arc_serial_regs *const regs = plat->reg;
|
|
uint32_t status = readb(®s->status);
|
|
|
|
if (input)
|
|
return status & UART_RXEMPTY ? 0 : 1;
|
|
else
|
|
return status & UART_TXEMPTY ? 0 : 1;
|
|
}
|
|
|
|
static int arc_serial_getc(struct udevice *dev)
|
|
{
|
|
struct arc_serial_platdata *plat = dev->platdata;
|
|
struct arc_serial_regs *const regs = plat->reg;
|
|
|
|
while (!arc_serial_tstc(regs))
|
|
;
|
|
|
|
/* Check for overflow errors */
|
|
if (readb(®s->status) & UART_OVERFLOW_ERR)
|
|
return 0;
|
|
|
|
return readb(®s->data) & 0xFF;
|
|
}
|
|
|
|
static int arc_serial_probe(struct udevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_serial_ops arc_serial_ops = {
|
|
.putc = arc_serial_putc,
|
|
.pending = arc_serial_pending,
|
|
.getc = arc_serial_getc,
|
|
.setbrg = arc_serial_setbrg,
|
|
};
|
|
|
|
static const struct udevice_id arc_serial_ids[] = {
|
|
{ .compatible = "snps,arc-uart" },
|
|
{ }
|
|
};
|
|
|
|
static int arc_serial_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct arc_serial_platdata *plat = dev_get_platdata(dev);
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
plat->reg = (struct arc_serial_regs *)devfdt_get_addr(dev);
|
|
plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
|
|
"clock-frequency", 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
U_BOOT_DRIVER(serial_arc) = {
|
|
.name = "serial_arc",
|
|
.id = UCLASS_SERIAL,
|
|
.of_match = arc_serial_ids,
|
|
.ofdata_to_platdata = arc_serial_ofdata_to_platdata,
|
|
.probe = arc_serial_probe,
|
|
.ops = &arc_serial_ops,
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
};
|