upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
132 lines
3.0 KiB
132 lines
3.0 KiB
/*
|
|
* jtag-console.c - console driver over Blackfin JTAG
|
|
*
|
|
* Copyright (c) 2008 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <devices.h>
|
|
#include <asm/blackfin.h>
|
|
|
|
#ifndef CONFIG_JTAG_CONSOLE_TIMEOUT
|
|
# define CONFIG_JTAG_CONSOLE_TIMEOUT 100
|
|
#endif
|
|
|
|
/* The Blackfin tends to be much much faster than the JTAG hardware. */
|
|
static void jtag_write_emudat(uint32_t emudat)
|
|
{
|
|
static bool overflowed = false;
|
|
ulong timeout = get_timer(0) + CONFIG_JTAG_CONSOLE_TIMEOUT;
|
|
while (bfin_read_DBGSTAT() & 0x1) {
|
|
if (overflowed)
|
|
return;
|
|
if (timeout < get_timer(0))
|
|
overflowed = true;
|
|
}
|
|
overflowed = false;
|
|
__asm__ __volatile__("emudat = %0;" : : "d"(emudat));
|
|
}
|
|
/* Transmit a buffer. The format is:
|
|
* [32bit length][actual data]
|
|
*/
|
|
static void jtag_send(const char *c, uint32_t len)
|
|
{
|
|
uint32_t i;
|
|
|
|
if (len == 0)
|
|
return;
|
|
|
|
/* First send the length */
|
|
jtag_write_emudat(len);
|
|
|
|
/* Then send the data */
|
|
for (i = 0; i < len; i += 4)
|
|
jtag_write_emudat((c[i] << 0) | (c[i+1] << 8) | (c[i+2] << 16) | (c[i+3] << 24));
|
|
}
|
|
static void jtag_putc(const char c)
|
|
{
|
|
jtag_send(&c, 1);
|
|
}
|
|
static void jtag_puts(const char *s)
|
|
{
|
|
jtag_send(s, strlen(s));
|
|
}
|
|
|
|
static size_t inbound_len, leftovers_len;
|
|
|
|
/* Lower layers want to know when jtag has data */
|
|
static int jtag_tstc_dbg(void)
|
|
{
|
|
return (bfin_read_DBGSTAT() & 0x2);
|
|
}
|
|
|
|
/* Higher layers want to know when any data is available */
|
|
static int jtag_tstc(void)
|
|
{
|
|
return jtag_tstc_dbg() || leftovers_len;
|
|
}
|
|
|
|
/* Receive a buffer. The format is:
|
|
* [32bit length][actual data]
|
|
*/
|
|
static uint32_t leftovers;
|
|
static int jtag_getc(void)
|
|
{
|
|
int ret;
|
|
uint32_t emudat;
|
|
|
|
/* see if any data is left over */
|
|
if (leftovers_len) {
|
|
--leftovers_len;
|
|
ret = leftovers & 0xff;
|
|
leftovers >>= 8;
|
|
return ret;
|
|
}
|
|
|
|
/* wait for new data ! */
|
|
while (!jtag_tstc_dbg())
|
|
continue;
|
|
__asm__("%0 = emudat;" : "=d"(emudat));
|
|
|
|
if (inbound_len == 0) {
|
|
/* grab the length */
|
|
inbound_len = emudat;
|
|
} else {
|
|
/* store the bytes */
|
|
leftovers_len = min(4, inbound_len);
|
|
inbound_len -= leftovers_len;
|
|
leftovers = emudat;
|
|
}
|
|
|
|
return jtag_getc();
|
|
}
|
|
|
|
int drv_jtag_console_init(void)
|
|
{
|
|
device_t dev;
|
|
int ret;
|
|
|
|
memset(&dev, 0x00, sizeof(dev));
|
|
strcpy(dev.name, "jtag");
|
|
dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
|
|
dev.putc = jtag_putc;
|
|
dev.puts = jtag_puts;
|
|
dev.tstc = jtag_tstc;
|
|
dev.getc = jtag_getc;
|
|
|
|
ret = device_register(&dev);
|
|
return (ret == 0 ? 1 : ret);
|
|
}
|
|
|
|
#ifdef CONFIG_UART_CONSOLE_IS_JTAG
|
|
/* Since the JTAG is always available (at power on), allow it to fake a UART */
|
|
void serial_set_baud(uint32_t baud) {}
|
|
void serial_setbrg(void) {}
|
|
int serial_init(void) { return 0; }
|
|
void serial_putc(const char c) __attribute__((alias("jtag_putc")));
|
|
void serial_puts(const char *s) __attribute__((alias("jtag_puts")));
|
|
int serial_tstc(void) __attribute__((alias("jtag_tstc")));
|
|
int serial_getc(void) __attribute__((alias("jtag_getc")));
|
|
#endif
|
|
|