mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-21 01:18:52 +09:00
![wdenk](/assets/img/avatar_default.png)
pointing to a location in flash * Fix INCA-IP clock calculation: 400/3 = 133.3 MHz, not 130.
172 lines
3.2 KiB
C
172 lines
3.2 KiB
C
/***********************************************************************
|
|
*
|
|
* (C) Copyright 2004
|
|
* DENX Software Engineering
|
|
* Wolfgang Denk, wd@denx.de
|
|
* All rights reserved.
|
|
*
|
|
* Simple 16550A serial driver
|
|
*
|
|
* Originally from linux source (drivers/char/ps2ser.c)
|
|
*
|
|
* Used by the PS/2 multiplexer driver (ps2mult.c)
|
|
*
|
|
***********************************************************************/
|
|
|
|
#include <common.h>
|
|
|
|
#ifdef CONFIG_PS2SERIAL
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/atomic.h>
|
|
#include <ps2mult.h>
|
|
|
|
/* #define DEBUG */
|
|
|
|
#define PS2SER_BAUD 57600
|
|
|
|
static int ps2ser_getc_hw(void);
|
|
static void ps2ser_interrupt(void *dev_id);
|
|
|
|
extern struct serial_state rs_table[]; /* in serial.c */
|
|
static struct serial_state *state;
|
|
|
|
static u_char ps2buf[PS2BUF_SIZE];
|
|
static atomic_t ps2buf_cnt;
|
|
static int ps2buf_in_idx;
|
|
static int ps2buf_out_idx;
|
|
|
|
|
|
static inline unsigned int ps2ser_in(int offset)
|
|
{
|
|
return readb((unsigned long) state->iomem_base + offset);
|
|
}
|
|
|
|
static inline void ps2ser_out(int offset, int value)
|
|
{
|
|
writeb(value, (unsigned long) state->iomem_base + offset);
|
|
}
|
|
|
|
int ps2ser_init(void)
|
|
{
|
|
int quot;
|
|
unsigned cval;
|
|
|
|
state = rs_table + CONFIG_PS2SERIAL;
|
|
|
|
quot = state->baud_base / PS2SER_BAUD;
|
|
cval = 0x3; /* 8N1 - 8 data bits, no parity bits, 1 stop bit */
|
|
|
|
/* Set speed, enable interrupts, enable FIFO
|
|
*/
|
|
ps2ser_out(UART_LCR, cval | UART_LCR_DLAB);
|
|
ps2ser_out(UART_DLL, quot & 0xff);
|
|
ps2ser_out(UART_DLM, quot >> 8);
|
|
ps2ser_out(UART_LCR, cval);
|
|
ps2ser_out(UART_IER, UART_IER_RDI);
|
|
ps2ser_out(UART_MCR, UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS);
|
|
ps2ser_out(UART_FCR,
|
|
UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
|
|
|
|
/* If we read 0xff from the LSR, there is no UART here
|
|
*/
|
|
if (ps2ser_in(UART_LSR) == 0xff) {
|
|
printf ("ps2ser.c: no UART found\n");
|
|
return -1;
|
|
}
|
|
|
|
irq_install_handler(state->irq, ps2ser_interrupt, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ps2ser_putc(int chr)
|
|
{
|
|
#ifdef DEBUG
|
|
printf(">>>> 0x%02x\n", chr);
|
|
#endif
|
|
|
|
while (!(ps2ser_in(UART_LSR) & UART_LSR_THRE));
|
|
|
|
ps2ser_out(UART_TX, chr);
|
|
}
|
|
|
|
static int ps2ser_getc_hw(void)
|
|
{
|
|
int res = -1;
|
|
|
|
if (ps2ser_in(UART_LSR) & UART_LSR_DR) {
|
|
res = (ps2ser_in(UART_RX));
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
int ps2ser_getc(void)
|
|
{
|
|
volatile int chr;
|
|
int flags;
|
|
|
|
#ifdef DEBUG
|
|
printf("<< ");
|
|
#endif
|
|
|
|
flags = disable_interrupts();
|
|
|
|
do {
|
|
if (atomic_read(&ps2buf_cnt) != 0) {
|
|
chr = ps2buf[ps2buf_out_idx++];
|
|
ps2buf_out_idx &= (PS2BUF_SIZE - 1);
|
|
atomic_dec(&ps2buf_cnt);
|
|
} else {
|
|
chr = ps2ser_getc_hw();
|
|
}
|
|
}
|
|
while (chr < 0);
|
|
|
|
if (flags) enable_interrupts();
|
|
|
|
#ifdef DEBUG
|
|
printf("0x%02x\n", chr);
|
|
#endif
|
|
|
|
return chr;
|
|
}
|
|
|
|
int ps2ser_check(void)
|
|
{
|
|
int flags;
|
|
|
|
flags = disable_interrupts();
|
|
ps2ser_interrupt(NULL);
|
|
if (flags) enable_interrupts();
|
|
|
|
return atomic_read(&ps2buf_cnt);
|
|
}
|
|
|
|
static void ps2ser_interrupt(void *dev_id)
|
|
{
|
|
int chr;
|
|
int iir;
|
|
|
|
do {
|
|
chr = ps2ser_getc_hw();
|
|
iir = ps2ser_in(UART_IIR);
|
|
if (chr < 0) continue;
|
|
|
|
if (atomic_read(&ps2buf_cnt) < PS2BUF_SIZE) {
|
|
ps2buf[ps2buf_in_idx++] = chr;
|
|
ps2buf_in_idx &= (PS2BUF_SIZE - 1);
|
|
atomic_inc(&ps2buf_cnt);
|
|
} else {
|
|
printf ("ps2ser.c: buffer overflow\n");
|
|
}
|
|
} while (iir & UART_IIR_RDI);
|
|
|
|
if (atomic_read(&ps2buf_cnt)) {
|
|
ps2mult_callback(atomic_read(&ps2buf_cnt));
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_PS2SERIAL */
|