iPod Classic: introduce s5l8702 UART driver
- polling/IRQ modes for Tx/Rx (TODO?: DMA) - fine adjust for Tx/Rx bitrates - auto bauding using HW circuitry - status and stats in debug screen Change-Id: I8650957063bc6d274d92eba2779d93ae73453fb6
This commit is contained in:
parent
291b2338c9
commit
9f27dc2103
3 changed files with 768 additions and 0 deletions
|
@ -1608,6 +1608,7 @@ target/arm/s5l8702/postmortemstub.S
|
||||||
target/arm/s5l8702/ipod6g/pmu-ipod6g.c
|
target/arm/s5l8702/ipod6g/pmu-ipod6g.c
|
||||||
target/arm/s5l8702/ipod6g/rtc-ipod6g.c
|
target/arm/s5l8702/ipod6g/rtc-ipod6g.c
|
||||||
target/arm/s5l8700/usb-nano2g-6g.c
|
target/arm/s5l8700/usb-nano2g-6g.c
|
||||||
|
target/arm/s5l8702/uc8702.c
|
||||||
#ifndef BOOTLOADER
|
#ifndef BOOTLOADER
|
||||||
target/arm/s5l8702/timer-s5l8702.c
|
target/arm/s5l8702/timer-s5l8702.c
|
||||||
target/arm/s5l8702/debug-s5l8702.c
|
target/arm/s5l8702/debug-s5l8702.c
|
||||||
|
|
446
firmware/target/arm/s5l8702/uc8702.c
Normal file
446
firmware/target/arm/s5l8702/uc8702.c
Normal file
|
@ -0,0 +1,446 @@
|
||||||
|
/***************************************************************************
|
||||||
|
* __________ __ ___.
|
||||||
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
||||||
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
||||||
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
||||||
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
||||||
|
* \/ \/ \/ \/ \/
|
||||||
|
* $Id$
|
||||||
|
*
|
||||||
|
* Copyright (C) 2014 by Cástor Muñoz
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or
|
||||||
|
* modify it under the terms of the GNU General Public License
|
||||||
|
* as published by the Free Software Foundation; either version 2
|
||||||
|
* of the License, or (at your option) any later version.
|
||||||
|
*
|
||||||
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
||||||
|
* KIND, either express or implied.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
#include <stdint.h>
|
||||||
|
#include "kernel.h"
|
||||||
|
#include "uc8702.h"
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* s5l8702 UART controller (UC8702)
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Rx related masks */
|
||||||
|
#define UTRSTAT_RX_RELATED_INTS \
|
||||||
|
(UTRSTAT_RX_INT_BIT | UTRSTAT_RX_TOUT_INT_BIT | \
|
||||||
|
UTRSTAT_ERR_INT_BIT | UTRSTAT_AUTOBR_INT_BIT)
|
||||||
|
#define UCON_RX_RELATED_INTS \
|
||||||
|
(UCON_RX_INT_BIT | UCON_RX_TOUT_INT_BIT | \
|
||||||
|
UCON_ERR_INT_BIT | UCON_AUTOBR_INT_BIT)
|
||||||
|
|
||||||
|
/* Initialization */
|
||||||
|
static void uartc_port_id_reset(struct uartc* uartc, int id)
|
||||||
|
{
|
||||||
|
uint32_t baddr = UART_PORT_BASE(uartc->baddr, id);
|
||||||
|
|
||||||
|
/* set port registers to default reset values */
|
||||||
|
UCON(baddr) = 0;
|
||||||
|
ULCON(baddr) = 0;
|
||||||
|
UMCON(baddr) = 0;
|
||||||
|
UFCON(baddr) = UFCON_RX_FIFO_RST_BIT | UFCON_TX_FIFO_RST_BIT;
|
||||||
|
/* clear all interrupts */
|
||||||
|
UTRSTAT(baddr) = UTRSTAT_RX_RELATED_INTS
|
||||||
|
| UTRSTAT_TX_INT_BIT
|
||||||
|
| UTRSTAT_MODEM_INT_BIT;
|
||||||
|
UBRDIV(baddr) = 0;
|
||||||
|
UBRCONTX(baddr) = 0;
|
||||||
|
UBRCONRX(baddr) = 0;
|
||||||
|
|
||||||
|
uartc->port_l[id] = (void*)0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void uartc_reset(struct uartc* uartc)
|
||||||
|
{
|
||||||
|
for (int id = 0; id < UART_PORT_MAX; id++)
|
||||||
|
uartc_port_id_reset(uartc, id);
|
||||||
|
}
|
||||||
|
|
||||||
|
void uartc_open(struct uartc* uartc)
|
||||||
|
__attribute__((alias("uartc_reset")));
|
||||||
|
|
||||||
|
void uartc_close(struct uartc* uartc)
|
||||||
|
__attribute__((alias("uartc_reset")));
|
||||||
|
|
||||||
|
void uartc_port_open(struct uartc_port *port)
|
||||||
|
{
|
||||||
|
struct uartc *uartc = port->uartc;
|
||||||
|
uint32_t baddr = UART_PORT_BASE(uartc->baddr, port->id);
|
||||||
|
|
||||||
|
port->baddr = baddr;
|
||||||
|
port->utrstat_int_mask = (port->rx_cb ? UTRSTAT_RX_RELATED_INTS : 0)
|
||||||
|
| (port->tx_cb ? UTRSTAT_TX_INT_BIT : 0);
|
||||||
|
port->abr_aborted = 0;
|
||||||
|
|
||||||
|
/* disable Tx/Rx and mask all interrupts */
|
||||||
|
UCON(baddr) = 0;
|
||||||
|
|
||||||
|
/* clear all interrupts */
|
||||||
|
UTRSTAT(baddr) = UTRSTAT_RX_RELATED_INTS
|
||||||
|
| UTRSTAT_TX_INT_BIT
|
||||||
|
| UTRSTAT_MODEM_INT_BIT;
|
||||||
|
|
||||||
|
/* configure registers */
|
||||||
|
UFCON(baddr) = UFCON_FIFO_ENABLE_BIT
|
||||||
|
| UFCON_RX_FIFO_RST_BIT
|
||||||
|
| UFCON_TX_FIFO_RST_BIT
|
||||||
|
| ((port->rx_trg & UFCON_RX_FIFO_TRG_MASK) << UFCON_RX_FIFO_TRG_POS)
|
||||||
|
| ((port->tx_trg & UFCON_TX_FIFO_TRG_MASK) << UFCON_TX_FIFO_TRG_POS);
|
||||||
|
|
||||||
|
UMCON(baddr) = UMCON_RTS_BIT; /* activate nRTS (low level) */
|
||||||
|
|
||||||
|
UCON(baddr) = (UCON_MODE_DISABLED << UCON_RX_MODE_POS)
|
||||||
|
| (UCON_MODE_DISABLED << UCON_TX_MODE_POS)
|
||||||
|
| ((port->clksel & UCON_CLKSEL_MASK) << UCON_CLKSEL_POS)
|
||||||
|
| (port->rx_cb ? UCON_RX_RELATED_INTS|UCON_RX_TOUT_EN_BIT : 0)
|
||||||
|
| (port->tx_cb ? UCON_TX_INT_BIT : 0);
|
||||||
|
|
||||||
|
/* register port on parent controller */
|
||||||
|
uartc->port_l[port->id] = port;
|
||||||
|
}
|
||||||
|
|
||||||
|
void uartc_port_close(struct uartc_port *port)
|
||||||
|
{
|
||||||
|
uartc_port_id_reset(port->uartc, port->id);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Configuration */
|
||||||
|
void uartc_port_config(struct uartc_port *port, unsigned int speed,
|
||||||
|
uint8_t data_bits, uint8_t parity, uint8_t stop_bits)
|
||||||
|
{
|
||||||
|
uint32_t baddr = port->baddr;
|
||||||
|
|
||||||
|
ULCON(baddr) = ((parity & ULCON_PARITY_MASK) << ULCON_PARITY_POS)
|
||||||
|
| ((stop_bits & ULCON_STOP_BITS_MASK) << ULCON_STOP_BITS_POS)
|
||||||
|
| ((data_bits & ULCON_DATA_BITS_MASK) << ULCON_DATA_BITS_POS);
|
||||||
|
|
||||||
|
uartc_port_set_bitrate(port, speed);
|
||||||
|
}
|
||||||
|
|
||||||
|
void uartc_port_set_bitrate(struct uartc_port *port, unsigned int speed)
|
||||||
|
{
|
||||||
|
uint32_t baddr = port->baddr;
|
||||||
|
int uclk = port->clkhz;
|
||||||
|
|
||||||
|
/* Real baud width in UCLK/16 ticks: trunc(UCLK/(16*speed) + 0.5) */
|
||||||
|
int brdiv = (uclk + (speed << 3)) / (speed << 4);
|
||||||
|
|
||||||
|
UBRDIV(baddr) = brdiv - 1;
|
||||||
|
|
||||||
|
/* Fine adjust:
|
||||||
|
*
|
||||||
|
* Along the whole frame, insert/remove "jittered" bauds when needed
|
||||||
|
* to minimize frame lenght accumulated error.
|
||||||
|
*
|
||||||
|
* jitter_width: "jittered" bauds are 1/16 wider/narrower than normal
|
||||||
|
* bauds, so step is 1/16 of real baud width = brdiv (in UCLK ticks)
|
||||||
|
*
|
||||||
|
* baud_err_width: it is the difference between theoric width and real
|
||||||
|
* width = CLK/speed - brdiv*16 (in UCLK ticks)
|
||||||
|
*
|
||||||
|
* Previous widths are scaled by 'speed' factor to simplify operations
|
||||||
|
* and preserve precision using integer operations.
|
||||||
|
*/
|
||||||
|
int jitter_width = brdiv * speed;
|
||||||
|
int baud_err_width = uclk - (jitter_width << 4);
|
||||||
|
|
||||||
|
int jitter_incdec = UBRCON_JITTER_INC;
|
||||||
|
if (baud_err_width < 0) {
|
||||||
|
baud_err_width = -baud_err_width;
|
||||||
|
jitter_incdec = UBRCON_JITTER_DEC;
|
||||||
|
}
|
||||||
|
|
||||||
|
int err_width = 0;
|
||||||
|
uint32_t brcon = 0;
|
||||||
|
/* TODO: for (bit < configured frame length) */
|
||||||
|
for (int bit = 0; bit < UC_FRAME_MAX_LEN; bit++) {
|
||||||
|
err_width += baud_err_width;
|
||||||
|
/* adjust to the nearest width */
|
||||||
|
if (jitter_width < (err_width << 1)) {
|
||||||
|
brcon |= jitter_incdec << UBRCON_JITTER_POS(bit);
|
||||||
|
err_width -= jitter_width;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
UBRCONRX(baddr) = brcon;
|
||||||
|
UBRCONTX(baddr) = brcon;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* TODO: uarc_port_set_bitrate_raw() using precalculated values */
|
||||||
|
|
||||||
|
/* Select Tx/Rx modes: disabling Tx/Rx resets HW, including
|
||||||
|
FIFOs and shift registers */
|
||||||
|
void uartc_port_set_rx_mode(struct uartc_port *port, uint32_t mode)
|
||||||
|
{
|
||||||
|
UCON(port->baddr) = (mode << UCON_RX_MODE_POS) |
|
||||||
|
(UCON(port->baddr) & ~(UCON_RX_MODE_MASK << UCON_RX_MODE_POS));
|
||||||
|
}
|
||||||
|
|
||||||
|
void uartc_port_set_tx_mode(struct uartc_port *port, uint32_t mode)
|
||||||
|
{
|
||||||
|
UCON(port->baddr) = (mode << UCON_TX_MODE_POS) |
|
||||||
|
(UCON(port->baddr) & ~(UCON_TX_MODE_MASK << UCON_TX_MODE_POS));
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Transmit */
|
||||||
|
bool uartc_port_tx_ready(struct uartc_port *port)
|
||||||
|
{
|
||||||
|
return (UTRSTAT(port->baddr) & UTRSTAT_TXBUF_EMPTY_BIT);
|
||||||
|
}
|
||||||
|
|
||||||
|
void uartc_port_tx_byte(struct uartc_port *port, uint8_t ch)
|
||||||
|
{
|
||||||
|
UTXH(port->baddr) = ch;
|
||||||
|
#ifdef UC8702_DEBUG
|
||||||
|
port->n_tx_bytes++;
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
|
||||||
|
void uartc_port_send_byte(struct uartc_port *port, uint8_t ch)
|
||||||
|
{
|
||||||
|
/* wait for transmit buffer empty */
|
||||||
|
while (!uartc_port_tx_ready(port));
|
||||||
|
uartc_port_tx_byte(port, ch);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Receive */
|
||||||
|
bool uartc_port_rx_ready(struct uartc_port *port)
|
||||||
|
{
|
||||||
|
/* test receive buffer data ready */
|
||||||
|
return (UTRSTAT(port->baddr) & UTRSTAT_RXBUF_RDY_BIT);
|
||||||
|
}
|
||||||
|
|
||||||
|
uint8_t uartc_port_rx_byte(struct uartc_port *port)
|
||||||
|
{
|
||||||
|
return URXH(port->baddr) & 0xff;
|
||||||
|
}
|
||||||
|
|
||||||
|
uint8_t uartc_port_read_byte(struct uartc_port *port)
|
||||||
|
{
|
||||||
|
while (!uartc_port_rx_ready(port));
|
||||||
|
return uartc_port_rx_byte(port);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Autobauding */
|
||||||
|
static inline int uartc_port_abr_status(struct uartc_port *port)
|
||||||
|
{
|
||||||
|
return UABRSTAT(port->baddr) & UABRSTAT_STATUS_MASK;
|
||||||
|
}
|
||||||
|
|
||||||
|
void uartc_port_abr_start(struct uartc_port *port)
|
||||||
|
{
|
||||||
|
port->abr_aborted = 0;
|
||||||
|
UCON(port->baddr) |= UCON_AUTOBR_START_BIT;
|
||||||
|
}
|
||||||
|
|
||||||
|
void uartc_port_abr_stop(struct uartc_port *port)
|
||||||
|
{
|
||||||
|
if (uartc_port_abr_status(port) == UABRSTAT_STATUS_COUNTING)
|
||||||
|
/* There is no known way to stop the HW once COUNTING is
|
||||||
|
* in progress.
|
||||||
|
* If we disable AUTOBR_START_BIT now, COUNTING is not
|
||||||
|
* aborted, instead the HW will launch interrupts for
|
||||||
|
* every new rising edge detected while AUTOBR_START_BIT
|
||||||
|
* remains disabled.
|
||||||
|
* If AUTOBR_START_BIT is enabled, the HW will stop by
|
||||||
|
* itself when a rising edge is detected.
|
||||||
|
* So, do not disable AUTOBR_START_BIT and wait for the
|
||||||
|
* next rising edge.
|
||||||
|
*/
|
||||||
|
port->abr_aborted = 1;
|
||||||
|
else
|
||||||
|
UCON(port->baddr) &= ~UCON_AUTOBR_START_BIT;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* ISR */
|
||||||
|
void ICODE_ATTR uartc_callback(struct uartc *uartc, int id)
|
||||||
|
{
|
||||||
|
struct uartc_port *port = uartc->port_l[id];
|
||||||
|
uint32_t baddr = port->baddr;
|
||||||
|
|
||||||
|
/* filter registered interrupts */
|
||||||
|
uint32_t ints = UTRSTAT(baddr) & port->utrstat_int_mask;
|
||||||
|
|
||||||
|
/* clear interrupts, events ocurring while processing
|
||||||
|
this ISR will be processed in the next call */
|
||||||
|
UTRSTAT(baddr) = ints;
|
||||||
|
|
||||||
|
if (ints & UTRSTAT_RX_RELATED_INTS)
|
||||||
|
{
|
||||||
|
int len = 0;
|
||||||
|
uint32_t abr_cnt = 0;
|
||||||
|
|
||||||
|
if (ints & UTRSTAT_AUTOBR_INT_BIT)
|
||||||
|
{
|
||||||
|
if (uartc_port_abr_status(port) == UABRSTAT_STATUS_COUNTING) {
|
||||||
|
#ifdef UC8702_DEBUG
|
||||||
|
if (UCON(baddr) & UCON_AUTOBR_START_BIT) port->n_abnormal0++;
|
||||||
|
else port->n_abnormal1++;
|
||||||
|
#endif
|
||||||
|
/* try to fix abnormal situations */
|
||||||
|
UCON(baddr) |= UCON_AUTOBR_START_BIT;
|
||||||
|
}
|
||||||
|
else if (!port->abr_aborted)
|
||||||
|
abr_cnt = UABRCNT(baddr);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (ints & (UTRSTAT_RX_RELATED_INTS ^ UTRSTAT_AUTOBR_INT_BIT))
|
||||||
|
{
|
||||||
|
/* get FIFO count */
|
||||||
|
uint32_t ufstat = UFSTAT(baddr);
|
||||||
|
len = (ufstat & UFSTAT_RX_FIFO_CNT_MASK) |
|
||||||
|
((ufstat & UFSTAT_RX_FIFO_FULL_BIT) >> (8 - 4));
|
||||||
|
|
||||||
|
for (int i = 0; i < len; i++) {
|
||||||
|
/* must read error status first, then data */
|
||||||
|
port->rx_err[i] = UERSTAT(baddr);
|
||||||
|
port->rx_data[i] = URXH(baddr);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* 'abr_cnt' is zero when no ABR interrupt exists, 'len'
|
||||||
|
* might be zero due to RX_TOUT interrupts are raised by
|
||||||
|
* the hardware even when RX FIFO is empty.
|
||||||
|
* When overrun, it is marked on the first readed error:
|
||||||
|
* overrun = len ? (rx_err[0] & UERSTAT_OVERRUN_BIT) : 0
|
||||||
|
*/
|
||||||
|
port->rx_cb(len, port->rx_data, port->rx_err, abr_cnt);
|
||||||
|
|
||||||
|
#ifdef UC8702_DEBUG
|
||||||
|
if (len) {
|
||||||
|
port->n_rx_bytes += len;
|
||||||
|
if (port->rx_err[0] & UERSTAT_OVERRUN_BIT)
|
||||||
|
port->n_ovr_err++;
|
||||||
|
for (int i = 0; i < len; i++) {
|
||||||
|
if (port->rx_err[i] & UERSTAT_PARITY_ERR_BIT)
|
||||||
|
port->n_parity_err++;
|
||||||
|
if (port->rx_err[i] & UERSTAT_FRAME_ERR_BIT)
|
||||||
|
port->n_frame_err++;
|
||||||
|
if (port->rx_err[i] & UERSTAT_BREAK_DETECT_BIT)
|
||||||
|
port->n_break_detect++;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
|
||||||
|
#if 0
|
||||||
|
/* not used and not tested */
|
||||||
|
if (ints & UTRSTAT_TX_INT_BIT)
|
||||||
|
{
|
||||||
|
port->tx_cb(UART_FIFO_SIZE - ((UFSTAT(baddr) & \
|
||||||
|
UFSTAT_TX_FIFO_CNT_MASK) >> UFSTAT_TX_FIFO_CNT_POS));
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
#ifdef UC8702_DEBUG
|
||||||
|
/*#define LOGF_ENABLE*/
|
||||||
|
#include "logf.h"
|
||||||
|
|
||||||
|
static int get_bitrate(int uclk, int brdiv, int brcon, int frame_len)
|
||||||
|
{
|
||||||
|
logf("get_bitrate(%d, %d, 0x%08x, %d)", uclk, brdiv, brcon, frame_len);
|
||||||
|
|
||||||
|
int avg_speed;
|
||||||
|
int speed_sum = 0;
|
||||||
|
unsigned int frame_width = 0; /* in UCLK clock ticks */
|
||||||
|
|
||||||
|
/* calculate resulting speed for every frame len */
|
||||||
|
for (int bit = 0; bit < frame_len; bit++)
|
||||||
|
{
|
||||||
|
frame_width += brdiv * 16;
|
||||||
|
|
||||||
|
int incdec = ((brcon >> UBRCON_JITTER_POS(bit)) & UBRCON_JITTER_MASK);
|
||||||
|
if (incdec == UBRCON_JITTER_INC) frame_width += brdiv;
|
||||||
|
else if (incdec == UBRCON_JITTER_DEC) frame_width -= brdiv;
|
||||||
|
|
||||||
|
/* speed = truncate((UCLK / (real_frame_width / NBITS)) + 0.5)
|
||||||
|
XXX: overflows for big UCLK */
|
||||||
|
int speed = (((uclk*(bit+1))<<1) + frame_width) / (frame_width<<1);
|
||||||
|
speed_sum += speed;
|
||||||
|
logf(" %d: %c %d", bit, ((incdec == UBRCON_JITTER_INC) ? 'i' :
|
||||||
|
((incdec == UBRCON_JITTER_DEC) ? 'd' : '.')), speed);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* average of the speed for all frame lengths */
|
||||||
|
avg_speed = speed_sum / frame_len;
|
||||||
|
logf(" avg speed = %d", avg_speed);
|
||||||
|
|
||||||
|
return avg_speed;
|
||||||
|
}
|
||||||
|
|
||||||
|
void uartc_port_get_line_info(struct uartc_port *port,
|
||||||
|
int *tx_status, int *rx_status,
|
||||||
|
int *tx_speed, int *rx_speed, char *line_cfg)
|
||||||
|
{
|
||||||
|
uint32_t baddr = port->baddr;
|
||||||
|
|
||||||
|
uint32_t ucon = UCON(baddr);
|
||||||
|
if (*tx_status)
|
||||||
|
*tx_status = ((ucon >> UCON_TX_MODE_POS) & UCON_TX_MODE_MASK) ? 1 : 0;
|
||||||
|
if (*rx_status)
|
||||||
|
*rx_status = ((ucon >> UCON_RX_MODE_POS) & UCON_RX_MODE_MASK) ? 1 : 0;
|
||||||
|
|
||||||
|
uint32_t ulcon = ULCON(baddr);
|
||||||
|
int n_data = ((ulcon >> ULCON_DATA_BITS_POS) & ULCON_DATA_BITS_MASK) + 5;
|
||||||
|
int n_stop = ((ulcon >> ULCON_STOP_BITS_POS) & ULCON_STOP_BITS_MASK) + 1;
|
||||||
|
int parity = (ulcon >> ULCON_PARITY_POS) & ULCON_PARITY_MASK;
|
||||||
|
int frame_len = 1 + n_data + (parity ? 1 : 0) + n_stop;
|
||||||
|
|
||||||
|
uint32_t brdiv = UBRDIV(baddr) + 1;
|
||||||
|
if (*tx_speed)
|
||||||
|
*tx_speed = get_bitrate(port->clkhz, brdiv, UBRCONTX(baddr), frame_len);
|
||||||
|
if (*rx_speed)
|
||||||
|
*rx_speed = get_bitrate(port->clkhz, brdiv, UBRCONRX(baddr), frame_len);
|
||||||
|
|
||||||
|
if (*line_cfg) {
|
||||||
|
line_cfg[0] = '0' + n_data;
|
||||||
|
line_cfg[1] = ((parity == ULCON_PARITY_NONE) ? 'N' :
|
||||||
|
((parity == ULCON_PARITY_EVEN) ? 'E' :
|
||||||
|
((parity == ULCON_PARITY_ODD) ? 'O' :
|
||||||
|
((parity == ULCON_PARITY_FORCE_1) ? 'M' :
|
||||||
|
((parity == ULCON_PARITY_FORCE_0) ? 'S' : '?')))));
|
||||||
|
line_cfg[2] = '0' + n_stop;
|
||||||
|
line_cfg[3] = '\0';
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Autobauding */
|
||||||
|
int uartc_port_get_abr_info(struct uartc_port *port, unsigned int *abr_cnt)
|
||||||
|
{
|
||||||
|
int status;
|
||||||
|
uint32_t abr_status;
|
||||||
|
uint32_t baddr = port->baddr;
|
||||||
|
|
||||||
|
int flags = disable_irq_save();
|
||||||
|
|
||||||
|
abr_status = uartc_port_abr_status(port);
|
||||||
|
|
||||||
|
if (UCON(port->baddr) & UCON_AUTOBR_START_BIT) {
|
||||||
|
if (abr_status == UABRSTAT_STATUS_COUNTING)
|
||||||
|
status = ABR_INFO_ST_COUNTING; /* waiting for rising edge */
|
||||||
|
else
|
||||||
|
status = ABR_INFO_ST_LAUNCHED; /* waiting for falling edge */
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
if (abr_status == UABRSTAT_STATUS_COUNTING)
|
||||||
|
status = ABR_INFO_ST_ABNORMAL;
|
||||||
|
else
|
||||||
|
status = ABR_INFO_ST_IDLE;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (*abr_cnt)
|
||||||
|
*abr_cnt = UABRCNT(baddr);
|
||||||
|
|
||||||
|
restore_irq(flags);
|
||||||
|
|
||||||
|
return status;
|
||||||
|
}
|
||||||
|
#endif /* UC8702_DEBUG */
|
321
firmware/target/arm/s5l8702/uc8702.h
Normal file
321
firmware/target/arm/s5l8702/uc8702.h
Normal file
|
@ -0,0 +1,321 @@
|
||||||
|
/***************************************************************************
|
||||||
|
* __________ __ ___.
|
||||||
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
||||||
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
||||||
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
||||||
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
||||||
|
* \/ \/ \/ \/ \/
|
||||||
|
* $Id$
|
||||||
|
*
|
||||||
|
* Copyright (C) 2014 by Cástor Muñoz
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or
|
||||||
|
* modify it under the terms of the GNU General Public License
|
||||||
|
* as published by the Free Software Foundation; either version 2
|
||||||
|
* of the License, or (at your option) any later version.
|
||||||
|
*
|
||||||
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
||||||
|
* KIND, either express or implied.
|
||||||
|
*
|
||||||
|
****************************************************************************/
|
||||||
|
#ifndef __UC8702_H__
|
||||||
|
#define __UC8702_H__
|
||||||
|
|
||||||
|
#include <stdint.h>
|
||||||
|
#include <stdbool.h>
|
||||||
|
|
||||||
|
|
||||||
|
/* s5l8702 UART controller (UC8702):
|
||||||
|
*
|
||||||
|
* This UART is similar to the UART included in s5l8700 (see also
|
||||||
|
* s3c2416 and s3c6400 datasheets), UC8702 adds fine tunning for
|
||||||
|
* Tx/Rx bitrate and autobauding.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*#define UC8702_DEBUG*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* uc8702 HW definitions
|
||||||
|
*/
|
||||||
|
#define UART_PORT_MAX 4
|
||||||
|
#define UART_FIFO_SIZE 16
|
||||||
|
|
||||||
|
#define UART_PORT_BASE(b,i) ((b) + 0x4000 * (i))
|
||||||
|
|
||||||
|
/*
|
||||||
|
* controller registers
|
||||||
|
*/
|
||||||
|
#define REG32_PTR_T volatile uint32_t *
|
||||||
|
|
||||||
|
#define ULCON(ba) (*((REG32_PTR_T)((ba) + 0x00))) /* line control */
|
||||||
|
#define UCON(ba) (*((REG32_PTR_T)((ba) + 0x04))) /* control */
|
||||||
|
#define UFCON(ba) (*((REG32_PTR_T)((ba) + 0x08))) /* FIFO control */
|
||||||
|
#define UMCON(ba) (*((REG32_PTR_T)((ba) + 0x0C))) /* modem control */
|
||||||
|
#define UTRSTAT(ba) (*((REG32_PTR_T)((ba) + 0x10))) /* Tx/Rx status */
|
||||||
|
#define UERSTAT(ba) (*((REG32_PTR_T)((ba) + 0x14))) /* Rx error status */
|
||||||
|
#define UFSTAT(ba) (*((REG32_PTR_T)((ba) + 0x18))) /* FIFO status */
|
||||||
|
#define UMSTAT(ba) (*((REG32_PTR_T)((ba) + 0x1C))) /* modem status */
|
||||||
|
#define UTXH(ba) (*((REG32_PTR_T)((ba) + 0x20))) /* transmission hold */
|
||||||
|
#define URXH(ba) (*((REG32_PTR_T)((ba) + 0x24))) /* receive buffer */
|
||||||
|
#define UBRDIV(ba) (*((REG32_PTR_T)((ba) + 0x28))) /* baud rate divisor */
|
||||||
|
#define UABRCNT(ba) (*((REG32_PTR_T)((ba) + 0x2c))) /* autobaud counter */
|
||||||
|
#define UABRSTAT(ba) (*((REG32_PTR_T)((ba) + 0x30))) /* autobaud status */
|
||||||
|
#define UBRCONTX(ba) (*((REG32_PTR_T)((ba) + 0x34))) /* Tx frame config */
|
||||||
|
#define UBRCONRX(ba) (*((REG32_PTR_T)((ba) + 0x38))) /* Rx frame config */
|
||||||
|
|
||||||
|
/* ULCON register */
|
||||||
|
#define ULCON_DATA_BITS_MASK 0x3
|
||||||
|
#define ULCON_DATA_BITS_POS 0
|
||||||
|
#define ULCON_DATA_BITS_5 0
|
||||||
|
#define ULCON_DATA_BITS_6 1
|
||||||
|
#define ULCON_DATA_BITS_7 2
|
||||||
|
#define ULCON_DATA_BITS_8 3
|
||||||
|
|
||||||
|
#define ULCON_STOP_BITS_MASK 0x1
|
||||||
|
#define ULCON_STOP_BITS_POS 2
|
||||||
|
#define ULCON_STOP_BITS_1 0
|
||||||
|
#define ULCON_STOP_BITS_2 1
|
||||||
|
|
||||||
|
#define ULCON_PARITY_MASK 0x7
|
||||||
|
#define ULCON_PARITY_POS 3
|
||||||
|
#define ULCON_PARITY_NONE 0
|
||||||
|
#define ULCON_PARITY_ODD 4
|
||||||
|
#define ULCON_PARITY_EVEN 5
|
||||||
|
#define ULCON_PARITY_FORCE_1 6
|
||||||
|
#define ULCON_PARITY_FORCE_0 7
|
||||||
|
|
||||||
|
#define ULCON_INFRARED_EN_BIT (1 << 6)
|
||||||
|
|
||||||
|
/* UCON register */
|
||||||
|
#define UCON_RX_MODE_MASK 0x3
|
||||||
|
#define UCON_RX_MODE_POS 0
|
||||||
|
|
||||||
|
#define UCON_TX_MODE_MASK 0x3
|
||||||
|
#define UCON_TX_MODE_POS 2
|
||||||
|
|
||||||
|
#define UCON_MODE_DISABLED 0
|
||||||
|
#define UCON_MODE_INTREQ 1 /* INT request or polling mode */
|
||||||
|
#define UCON_MODE_UNDEFINED 2 /* Not defined, DMAREQ signal 1 ??? */
|
||||||
|
#define UCON_MODE_DMAREQ 3 /* DMA request (signal 0) */
|
||||||
|
|
||||||
|
#define UCON_SEND_BREAK_BIT (1 << 4)
|
||||||
|
#define UCON_LOOPBACK_BIT (1 << 5)
|
||||||
|
#define UCON_RX_TOUT_EN_BIT (1 << 7) /* Rx timeout enable */
|
||||||
|
|
||||||
|
#define UCON_CLKSEL_MASK 0x1
|
||||||
|
#define UCON_CLKSEL_POS 10
|
||||||
|
#define UCON_CLKSEL_PCLK 0 /* internal */
|
||||||
|
#define UCON_CLKSEL_ECLK 1 /* external */
|
||||||
|
|
||||||
|
#define UCON_RX_TOUT_INT_BIT (1 << 11) /* Rx timeout INT enable */
|
||||||
|
#define UCON_RX_INT_BIT (1 << 12) /* Rx INT enable */
|
||||||
|
#define UCON_TX_INT_BIT (1 << 13) /* Tx INT enable */
|
||||||
|
#define UCON_ERR_INT_BIT (1 << 14) /* Rx error INT enable */
|
||||||
|
#define UCON_MODEM_INT_BIT (1 << 15) /* modem INT enable (TBC) */
|
||||||
|
#define UCON_AUTOBR_INT_BIT (1 << 16) /* autobauding INT enable */
|
||||||
|
#define UCON_AUTOBR_START_BIT (1 << 17) /* autobauding start/stop */
|
||||||
|
|
||||||
|
/* UFCON register */
|
||||||
|
#define UFCON_FIFO_ENABLE_BIT (1 << 0)
|
||||||
|
#define UFCON_RX_FIFO_RST_BIT (1 << 1)
|
||||||
|
#define UFCON_TX_FIFO_RST_BIT (1 << 2)
|
||||||
|
|
||||||
|
#define UFCON_RX_FIFO_TRG_MASK 0x3
|
||||||
|
#define UFCON_RX_FIFO_TRG_POS 4
|
||||||
|
#define UFCON_RX_FIFO_TRG_4 0
|
||||||
|
#define UFCON_RX_FIFO_TRG_8 1
|
||||||
|
#define UFCON_RX_FIFO_TRG_12 2
|
||||||
|
#define UFCON_RX_FIFO_TRG_16 3
|
||||||
|
|
||||||
|
#define UFCON_TX_FIFO_TRG_MASK 0x3
|
||||||
|
#define UFCON_TX_FIFO_TRG_POS 6
|
||||||
|
#define UFCON_TX_FIFO_TRG_EMPTY 0
|
||||||
|
#define UFCON_TX_FIFO_TRG_4 1
|
||||||
|
#define UFCON_TX_FIFO_TRG_8 2
|
||||||
|
#define UFCON_TX_FIFO_TRG_12 3
|
||||||
|
|
||||||
|
/* UMCON register */
|
||||||
|
#define UMCON_RTS_BIT (1 << 0)
|
||||||
|
#define UMCON_AUTO_FLOW_CTRL_BIT (1 << 4)
|
||||||
|
|
||||||
|
/* UTRSTAT register */
|
||||||
|
#define UTRSTAT_RXBUF_RDY_BIT (1 << 0)
|
||||||
|
#define UTRSTAT_TXBUF_EMPTY_BIT (1 << 1)
|
||||||
|
#define UTRSTAT_TX_EMPTY_BIT (1 << 2)
|
||||||
|
#define UTRSTAT_RX_TOUT_INT_BIT (1 << 3) /* Rx timeout INT status */
|
||||||
|
#define UTRSTAT_RX_INT_BIT (1 << 4)
|
||||||
|
#define UTRSTAT_TX_INT_BIT (1 << 5)
|
||||||
|
#define UTRSTAT_ERR_INT_BIT (1 << 6)
|
||||||
|
#define UTRSTAT_MODEM_INT_BIT (1 << 7) /* modem INT status (TBC) */
|
||||||
|
#define UTRSTAT_AUTOBR_INT_BIT (1 << 8) /* autobauding INT status */
|
||||||
|
|
||||||
|
/* UERSTAT register */
|
||||||
|
#define UERSTAT_OVERRUN_BIT (1 << 0)
|
||||||
|
#define UERSTAT_PARITY_ERR_BIT (1 << 1)
|
||||||
|
#define UERSTAT_FRAME_ERR_BIT (1 << 2)
|
||||||
|
#define UERSTAT_BREAK_DETECT_BIT (1 << 3)
|
||||||
|
|
||||||
|
/* UFSTAT register */
|
||||||
|
#define UFSTAT_RX_FIFO_CNT_MASK 0xf
|
||||||
|
#define UFSTAT_RX_FIFO_CNT_POS 0
|
||||||
|
|
||||||
|
#define UFSTAT_TX_FIFO_CNT_MASK 0xf
|
||||||
|
#define UFSTAT_TX_FIFO_CNT_POS 4
|
||||||
|
|
||||||
|
#define UFSTAT_RX_FIFO_FULL_BIT (1 << 8)
|
||||||
|
#define UFSTAT_TX_FIFO_FULL_BIT (1 << 9)
|
||||||
|
#define UFSTAT_RX_FIFO_ERR_BIT (1 << 10) /* clears when reading UERSTAT
|
||||||
|
for the last pending error */
|
||||||
|
/* UMSTAT register */
|
||||||
|
#define UMSTAT_CTS_ACTIVE_BIT (1 << 0)
|
||||||
|
#define UMSTAT_CTS_DELTA_BIT (1 << 4)
|
||||||
|
|
||||||
|
/* Bitrate:
|
||||||
|
*
|
||||||
|
* Master UCLK clock is divided by 16 to serialize data, UBRDIV is
|
||||||
|
* used to configure nominal bit width, NBW = (UBRDIV+1)*16 in UCLK
|
||||||
|
* clock ticks.
|
||||||
|
*
|
||||||
|
* Fine tuning works shrining/expanding each individual bit of each
|
||||||
|
* frame. Each bit width can be incremented/decremented by 1/16 of
|
||||||
|
* nominal bit width, it seems UCLK is divided by 17 for expanded
|
||||||
|
* bits and divided by 15 for compressed bits. A whole frame of N
|
||||||
|
* bits can be shrined or expanded up to (NBW * N / 16) UCLK clock
|
||||||
|
* ticks (in 1/16 steps).
|
||||||
|
*/
|
||||||
|
/* UBRCONx register */
|
||||||
|
#define UC_FRAME_MAX_LEN 12 /* 1 start + 8 data + 1 par + 2 stop */
|
||||||
|
#define UBRCON_JITTER_MASK 0x3
|
||||||
|
#define UBRCON_JITTER_POS(bit) ((bit) << 1) /* 0..UC_FRAME_MAX_LEN-1 */
|
||||||
|
|
||||||
|
#define UBRCON_JITTER_NONE 0 /* no jitter for this bit */
|
||||||
|
#define UBRCON_JITTER_INC 1 /* increment 1/16 bit width */
|
||||||
|
#define UBRCON_JITTER_UNUSED 2 /* does nothing */
|
||||||
|
#define UBRCON_JITTER_DEC 3 /* decremet 1/16 bit width */
|
||||||
|
|
||||||
|
/* Autobauding:
|
||||||
|
*
|
||||||
|
* Initial UABRSTAT is NOT_INIT, it goes to READY when either of
|
||||||
|
* UCON_AUTOBR bits are enabled for the first time.
|
||||||
|
*
|
||||||
|
* Interrupts are enabled/disabled using UCON_AUTOBR_INT_BIT and
|
||||||
|
* checked using UTRSTAT_AUTOBR_INT_BIT, writing this bit cleans the
|
||||||
|
* interrupt.
|
||||||
|
*
|
||||||
|
* When UCON_AUTOBR_START_BIT is enabled, autobauding starts and the
|
||||||
|
* hardware waits for a low pulse on RX line.
|
||||||
|
*
|
||||||
|
* Once autobauding is started, when a falling edge is detected on
|
||||||
|
* the RX line, UABRSTAT changes to COUNTING status, an internal
|
||||||
|
* counter starts incrementing at UCLK clock frequency. During
|
||||||
|
* COUNTING state, UABRCNT reads as the value of the previous ABR
|
||||||
|
* count, not the value of the current internal count.
|
||||||
|
*
|
||||||
|
* Count finish when a rising edge is detected on the line, at this
|
||||||
|
* moment internal counter stops and it can be read using UABRCNT
|
||||||
|
* register, UABRSTAT goes to READY, AUTOBR_START_BIT is disabled,
|
||||||
|
* and an interrupt is raised if UCON_AUTOBR_INT_BIT is enabled.
|
||||||
|
*/
|
||||||
|
/* UABRSTAT register */
|
||||||
|
#define UABRSTAT_STATUS_MASK 0x3
|
||||||
|
#define UABRSTAT_STATUS_POS 0
|
||||||
|
|
||||||
|
#define UABRSTAT_STATUS_NOT_INIT 0 /* initial status */
|
||||||
|
#define UABRSTAT_STATUS_READY 1 /* machine is ready */
|
||||||
|
#define UABRSTAT_STATUS_COUNTING 2 /* count in progress */
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* structs
|
||||||
|
*/
|
||||||
|
struct uartc
|
||||||
|
{
|
||||||
|
/* static configuration */
|
||||||
|
const uint32_t baddr;
|
||||||
|
/* private */
|
||||||
|
struct uartc_port *port_l[UART_PORT_MAX];
|
||||||
|
};
|
||||||
|
|
||||||
|
struct uartc_port
|
||||||
|
{
|
||||||
|
/* static configuration */
|
||||||
|
struct uartc * const uartc;
|
||||||
|
const uint8_t id; /* port number */
|
||||||
|
const uint8_t rx_trg; /* UFCON_RX_FIFO_TRG_xxx */
|
||||||
|
const uint8_t tx_trg; /* UFCON_TX_FIFO_TRG_xxx */
|
||||||
|
const uint8_t clksel; /* UFCON_CLKSEL_xxx */
|
||||||
|
const uint32_t clkhz; /* UCLK (PCLK or ECLK) frequency */
|
||||||
|
void (* const tx_cb) (int len); /* ISRs */
|
||||||
|
void (* const rx_cb) (int len, char *data, char *err, uint32_t abr_cnt);
|
||||||
|
|
||||||
|
/* private */
|
||||||
|
uint32_t baddr;
|
||||||
|
uint32_t utrstat_int_mask;
|
||||||
|
bool abr_aborted;
|
||||||
|
uint8_t rx_data[UART_FIFO_SIZE]; /* data buffer for rx_cb */
|
||||||
|
uint8_t rx_err[UART_FIFO_SIZE]; /* error buffer for rx_cb */
|
||||||
|
|
||||||
|
#ifdef UC8702_DEBUG
|
||||||
|
uint32_t n_tx_bytes;
|
||||||
|
uint32_t n_rx_bytes;
|
||||||
|
uint32_t n_ovr_err;
|
||||||
|
uint32_t n_parity_err;
|
||||||
|
uint32_t n_frame_err;
|
||||||
|
uint32_t n_break_detect;
|
||||||
|
uint32_t n_abnormal0;
|
||||||
|
uint32_t n_abnormal1;
|
||||||
|
#endif
|
||||||
|
};
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* uc8702 low level API
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Initialization */
|
||||||
|
void uartc_open(struct uartc* uartc);
|
||||||
|
void uartc_close(struct uartc* uartc);
|
||||||
|
void uartc_port_open(struct uartc_port *port);
|
||||||
|
void uartc_port_close(struct uartc_port *port);
|
||||||
|
void uartc_port_rx_onoff(struct uartc_port *port, bool onoff);
|
||||||
|
void uartc_port_tx_onoff(struct uartc_port *port, bool onoff);
|
||||||
|
|
||||||
|
/* Configuration */
|
||||||
|
void uartc_port_config(struct uartc_port *port, unsigned int speed,
|
||||||
|
uint8_t data_bits, uint8_t parity, uint8_t stop_bits);
|
||||||
|
void uartc_port_set_bitrate(struct uartc_port *port, unsigned int speed);
|
||||||
|
void uartc_port_set_rx_mode(struct uartc_port *port, uint32_t mode);
|
||||||
|
void uartc_port_set_tx_mode(struct uartc_port *port, uint32_t mode);
|
||||||
|
|
||||||
|
/* Transmit */
|
||||||
|
bool uartc_port_tx_ready(struct uartc_port *port);
|
||||||
|
void uartc_port_tx_byte(struct uartc_port *port, uint8_t ch);
|
||||||
|
void uartc_port_send_byte(struct uartc_port *port, uint8_t ch);
|
||||||
|
|
||||||
|
/* Receive */
|
||||||
|
bool uartc_port_rx_ready(struct uartc_port *port);
|
||||||
|
uint8_t uartc_port_rx_byte(struct uartc_port *port);
|
||||||
|
uint8_t uartc_port_read_byte(struct uartc_port *port);
|
||||||
|
|
||||||
|
/* Autobauding */
|
||||||
|
void uartc_port_abr_start(struct uartc_port *port);
|
||||||
|
void uartc_port_abr_stop(struct uartc_port *port);
|
||||||
|
|
||||||
|
/* ISR */
|
||||||
|
void uartc_callback(struct uartc *uartc, int dev);
|
||||||
|
|
||||||
|
#ifdef UC8702_DEBUG
|
||||||
|
enum {
|
||||||
|
ABR_INFO_ST_IDLE,
|
||||||
|
ABR_INFO_ST_LAUNCHED,
|
||||||
|
ABR_INFO_ST_COUNTING,
|
||||||
|
ABR_INFO_ST_ABNORMAL
|
||||||
|
};
|
||||||
|
|
||||||
|
void uartc_port_get_line_info(struct uartc_port *port,
|
||||||
|
int *tx_status, int *rx_status,
|
||||||
|
int *tx_speed, int *rx_speed, char *line_cfg);
|
||||||
|
|
||||||
|
int uartc_port_get_abr_info(struct uartc_port *port, unsigned int *abr_cnt);
|
||||||
|
#endif
|
||||||
|
#endif /* __UC8702_H__ */
|
Loading…
Reference in a new issue