Release 4.7 drivers/tty/hvc/hvc_bfin_jtag.c
/*
* Console via Blackfin JTAG Communication
*
* Copyright 2008-2011 Analog Devices Inc.
*
* Enter bugs at http://blackfin.uclinux.org/
*
* Licensed under the GPL-2 or later.
*/
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include "hvc_console.h"
/* See the Debug/Emulation chapter in the HRM */
#define EMUDOF 0x00000001
/* EMUDAT_OUT full & valid */
#define EMUDIF 0x00000002
/* EMUDAT_IN full & valid */
#define EMUDOOVF 0x00000004
/* EMUDAT_OUT overflow */
#define EMUDIOVF 0x00000008
/* EMUDAT_IN overflow */
/* Helper functions to glue the register API to simple C operations */
static inline uint32_t bfin_write_emudat(uint32_t emudat)
{
__asm__ __volatile__("emudat = %0;" : : "d"(emudat));
return emudat;
}
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static inline uint32_t bfin_read_emudat(void)
{
uint32_t emudat;
__asm__ __volatile__("%0 = emudat;" : "=d"(emudat));
return emudat;
}
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/* Send data to the host */
static int hvc_bfin_put_chars(uint32_t vt, const char *buf, int count)
{
static uint32_t outbound_len;
uint32_t emudat;
int ret;
if (bfin_read_DBGSTAT() & EMUDOF)
return 0;
if (!outbound_len) {
outbound_len = count;
bfin_write_emudat(outbound_len);
return 0;
}
ret = min(outbound_len, (uint32_t)4);
memcpy(&emudat, buf, ret);
bfin_write_emudat(emudat);
outbound_len -= ret;
return ret;
}
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/* Receive data from the host */
static int hvc_bfin_get_chars(uint32_t vt, char *buf, int count)
{
static uint32_t inbound_len;
uint32_t emudat;
int ret;
if (!(bfin_read_DBGSTAT() & EMUDIF))
return 0;
emudat = bfin_read_emudat();
if (!inbound_len) {
inbound_len = emudat;
return 0;
}
ret = min(inbound_len, (uint32_t)4);
memcpy(buf, &emudat, ret);
inbound_len -= ret;
return ret;
}
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/* Glue the HVC layers to the Blackfin layers */
static const struct hv_ops hvc_bfin_get_put_ops = {
.get_chars = hvc_bfin_get_chars,
.put_chars = hvc_bfin_put_chars,
};
static int __init hvc_bfin_console_init(void)
{
hvc_instantiate(0, 0, &hvc_bfin_get_put_ops);
return 0;
}
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console_initcall(hvc_bfin_console_init);
static int __init hvc_bfin_init(void)
{
hvc_alloc(0, 0, &hvc_bfin_get_put_ops, 128);
return 0;
}
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device_initcall(hvc_bfin_init);
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