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u-boot/cpu/ppc4xx/serial.c
Stefan Roese 887e2ec9ec Add support for AMCC Sequoia PPC440EPx eval board 
- Add support for PPC440EPx & PPC440GRx
- Add support for PPC440EP(x)/GR(x) NAND controller
  in cpu/ppc4xx directory
- Add NAND boot functionality for Sequoia board,
  please see doc/README.nand-boot-ppc440 for details
- This Sequoia NAND image doesn't support environment
  in NAND for now. This will be added in a short while.
Patch by Stefan Roese, 07 Sep 2006
2006-09-07 11:51:23 +02:00

984 lines
27 KiB
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/*
* (C) Copyright 2000-2006
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*------------------------------------------------------------------------------+ */
/*
* This source code has been made available to you by IBM on an AS-IS
* basis. Anyone receiving this source is licensed under IBM
* copyrights to use it in any way he or she deems fit, including
* copying it, modifying it, compiling it, and redistributing it either
* with or without modifications. No license under IBM patents or
* patent applications is to be implied by the copyright license.
*
* Any user of this software should understand that IBM cannot provide
* technical support for this software and will not be responsible for
* any consequences resulting from the use of this software.
*
* Any person who transfers this source code or any derivative work
* must include the IBM copyright notice, this paragraph, and the
* preceding two paragraphs in the transferred software.
*
* COPYRIGHT I B M CORPORATION 1995
* LICENSED MATERIAL - PROGRAM PROPERTY OF I B M
*/
/*------------------------------------------------------------------------------- */
/*
* Travis Sawyer 15 September 2004
* Added CONFIG_SERIAL_MULTI support
*/
#include <common.h>
#include <commproc.h>
#include <asm/processor.h>
#include <watchdog.h>
#include "vecnum.h"
#ifdef CONFIG_SERIAL_MULTI
#include <serial.h>
#endif
#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
#include <malloc.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
/*****************************************************************************/
#ifdef CONFIG_IOP480
#define SPU_BASE 0x40000000
#define spu_LineStat_rc 0x00 /* Line Status Register (Read/Clear) */
#define spu_LineStat_w 0x04 /* Line Status Register (Set) */
#define spu_Handshk_rc 0x08 /* Handshake Status Register (Read/Clear) */
#define spu_Handshk_w 0x0c /* Handshake Status Register (Set) */
#define spu_BRateDivh 0x10 /* Baud rate divisor high */
#define spu_BRateDivl 0x14 /* Baud rate divisor low */
#define spu_CtlReg 0x18 /* Control Register */
#define spu_RxCmd 0x1c /* Rx Command Register */
#define spu_TxCmd 0x20 /* Tx Command Register */
#define spu_RxBuff 0x24 /* Rx data buffer */
#define spu_TxBuff 0x24 /* Tx data buffer */
/*-----------------------------------------------------------------------------+
| Line Status Register.
+-----------------------------------------------------------------------------*/
#define asyncLSRport1 0x40000000
#define asyncLSRport1set 0x40000004
#define asyncLSRDataReady 0x80
#define asyncLSRFramingError 0x40
#define asyncLSROverrunError 0x20
#define asyncLSRParityError 0x10
#define asyncLSRBreakInterrupt 0x08
#define asyncLSRTxHoldEmpty 0x04
#define asyncLSRTxShiftEmpty 0x02
/*-----------------------------------------------------------------------------+
| Handshake Status Register.
+-----------------------------------------------------------------------------*/
#define asyncHSRport1 0x40000008
#define asyncHSRport1set 0x4000000c
#define asyncHSRDsr 0x80
#define asyncLSRCts 0x40
/*-----------------------------------------------------------------------------+
| Control Register.
+-----------------------------------------------------------------------------*/
#define asyncCRport1 0x40000018
#define asyncCRNormal 0x00
#define asyncCRLoopback 0x40
#define asyncCRAutoEcho 0x80
#define asyncCRDtr 0x20
#define asyncCRRts 0x10
#define asyncCRWordLength7 0x00
#define asyncCRWordLength8 0x08
#define asyncCRParityDisable 0x00
#define asyncCRParityEnable 0x04
#define asyncCREvenParity 0x00
#define asyncCROddParity 0x02
#define asyncCRStopBitsOne 0x00
#define asyncCRStopBitsTwo 0x01
#define asyncCRDisableDtrRts 0x00
/*-----------------------------------------------------------------------------+
| Receiver Command Register.
+-----------------------------------------------------------------------------*/
#define asyncRCRport1 0x4000001c
#define asyncRCRDisable 0x00
#define asyncRCREnable 0x80
#define asyncRCRIntDisable 0x00
#define asyncRCRIntEnabled 0x20
#define asyncRCRDMACh2 0x40
#define asyncRCRDMACh3 0x60
#define asyncRCRErrorInt 0x10
#define asyncRCRPauseEnable 0x08
/*-----------------------------------------------------------------------------+
| Transmitter Command Register.
+-----------------------------------------------------------------------------*/
#define asyncTCRport1 0x40000020
#define asyncTCRDisable 0x00
#define asyncTCREnable 0x80
#define asyncTCRIntDisable 0x00
#define asyncTCRIntEnabled 0x20
#define asyncTCRDMACh2 0x40
#define asyncTCRDMACh3 0x60
#define asyncTCRTxEmpty 0x10
#define asyncTCRErrorInt 0x08
#define asyncTCRStopPause 0x04
#define asyncTCRBreakGen 0x02
/*-----------------------------------------------------------------------------+
| Miscellanies defines.
+-----------------------------------------------------------------------------*/
#define asyncTxBufferport1 0x40000024
#define asyncRxBufferport1 0x40000024
#define asyncDLABLsbport1 0x40000014
#define asyncDLABMsbport1 0x40000010
#define asyncXOFFchar 0x13
#define asyncXONchar 0x11
/*
* Minimal serial functions needed to use one of the SMC ports
* as serial console interface.
*/
int serial_init (void)
{
volatile char val;
unsigned short br_reg;
br_reg = ((((CONFIG_CPUCLOCK * 1000000) / 16) / gd->baudrate) - 1);
/*
* Init onboard UART
*/
out8 (SPU_BASE + spu_LineStat_rc, 0x78); /* Clear all bits in Line Status Reg */
out8 (SPU_BASE + spu_BRateDivl, (br_reg & 0x00ff)); /* Set baud rate divisor... */
out8 (SPU_BASE + spu_BRateDivh, ((br_reg & 0xff00) >> 8)); /* ... */
out8 (SPU_BASE + spu_CtlReg, 0x08); /* Set 8 bits, no parity and 1 stop bit */
out8 (SPU_BASE + spu_RxCmd, 0xb0); /* Enable Rx */
out8 (SPU_BASE + spu_TxCmd, 0x9c); /* Enable Tx */
out8 (SPU_BASE + spu_Handshk_rc, 0xff); /* Clear Handshake */
val = in8 (SPU_BASE + spu_RxBuff); /* Dummy read, to clear receiver */
return (0);
}
void serial_setbrg (void)
{
unsigned short br_reg;
br_reg = ((((CONFIG_CPUCLOCK * 1000000) / 16) / gd->baudrate) - 1);
out8 (SPU_BASE + spu_BRateDivl, (br_reg & 0x00ff)); /* Set baud rate divisor... */
out8 (SPU_BASE + spu_BRateDivh, ((br_reg & 0xff00) >> 8)); /* ... */
}
void serial_putc (const char c)
{
if (c == '\n')
serial_putc ('\r');
/* load status from handshake register */
if (in8 (SPU_BASE + spu_Handshk_rc) != 00)
out8 (SPU_BASE + spu_Handshk_rc, 0xff); /* Clear Handshake */
out8 (SPU_BASE + spu_TxBuff, c); /* Put char */
while ((in8 (SPU_BASE + spu_LineStat_rc) & 04) != 04) {
if (in8 (SPU_BASE + spu_Handshk_rc) != 00)
out8 (SPU_BASE + spu_Handshk_rc, 0xff); /* Clear Handshake */
}
}
void serial_puts (const char *s)
{
while (*s) {
serial_putc (*s++);
}
}
int serial_getc ()
{
unsigned char status = 0;
while (1) {
status = in8 (asyncLSRport1);
if ((status & asyncLSRDataReady) != 0x0) {
break;
}
if ((status & ( asyncLSRFramingError |
asyncLSROverrunError |
asyncLSRParityError |
asyncLSRBreakInterrupt )) != 0) {
(void) out8 (asyncLSRport1,
asyncLSRFramingError |
asyncLSROverrunError |
asyncLSRParityError |
asyncLSRBreakInterrupt );
}
}
return (0x000000ff & (int) in8 (asyncRxBufferport1));
}
int serial_tstc ()
{
unsigned char status;
status = in8 (asyncLSRport1);
if ((status & asyncLSRDataReady) != 0x0) {
return (1);
}
if ((status & ( asyncLSRFramingError |
asyncLSROverrunError |
asyncLSRParityError |
asyncLSRBreakInterrupt )) != 0) {
(void) out8 (asyncLSRport1,
asyncLSRFramingError |
asyncLSROverrunError |
asyncLSRParityError |
asyncLSRBreakInterrupt);
}
return 0;
}
#endif /* CONFIG_IOP480 */
/*****************************************************************************/
#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405EP) || \
defined(CONFIG_440)
#if defined(CONFIG_440)
#if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
#define UART0_BASE CFG_PERIPHERAL_BASE + 0x00000300
#define UART1_BASE CFG_PERIPHERAL_BASE + 0x00000400
#else
#define UART0_BASE CFG_PERIPHERAL_BASE + 0x00000200
#define UART1_BASE CFG_PERIPHERAL_BASE + 0x00000300
#endif
#if defined(CONFIG_440SP) || defined(CONFIG_440SPE)
#define UART2_BASE CFG_PERIPHERAL_BASE + 0x00000600
#endif
#if defined(CONFIG_440GP)
#define CR0_MASK 0x3fff0000
#define CR0_EXTCLK_ENA 0x00600000
#define CR0_UDIV_POS 16
#define UDIV_SUBTRACT 1
#define UART0_SDR cntrl0
#define MFREG(a, d) d = mfdcr(a)
#define MTREG(a, d) mtdcr(a, d)
#else /* #if defined(CONFIG_440GP) */
/* all other 440 PPC's access clock divider via sdr register */
#define CR0_MASK 0xdfffffff
#define CR0_EXTCLK_ENA 0x00800000
#define CR0_UDIV_POS 0
#define UDIV_SUBTRACT 0
#define UART0_SDR sdr_uart0
#define UART1_SDR sdr_uart1
#if defined(CONFIG_440EP) || defined(CONFIG_440EPx) || \
defined(CONFIG_440GR) || defined(CONFIG_440GRx) || \
defined(CONFIG_440SP) || defined(CONFIG_440SPe)
#define UART2_SDR sdr_uart2
#endif
#if defined(CONFIG_440EP) || defined(CONFIG_440EPx) || \
defined(CONFIG_440GR) || defined(CONFIG_440GRx)
#define UART3_SDR sdr_uart3
#endif
#define MFREG(a, d) mfsdr(a, d)
#define MTREG(a, d) mtsdr(a, d)
#endif /* #if defined(CONFIG_440GP) */
#elif defined(CONFIG_405EP)
#define UART0_BASE 0xef600300
#define UART1_BASE 0xef600400
#define UCR0_MASK 0x0000007f
#define UCR1_MASK 0x00007f00
#define UCR0_UDIV_POS 0
#define UCR1_UDIV_POS 8
#define UDIV_MAX 127
#else /* CONFIG_405GP || CONFIG_405CR */
#define UART0_BASE 0xef600300
#define UART1_BASE 0xef600400
#define CR0_MASK 0x00001fff
#define CR0_EXTCLK_ENA 0x000000c0
#define CR0_UDIV_POS 1
#define UDIV_MAX 32
#endif
/* using serial port 0 or 1 as U-Boot console ? */
#if defined(CONFIG_UART1_CONSOLE)
#define ACTING_UART0_BASE UART1_BASE
#define ACTING_UART1_BASE UART0_BASE
#else
#define ACTING_UART0_BASE UART0_BASE
#define ACTING_UART1_BASE UART1_BASE
#endif
#if defined(CONFIG_SERIAL_MULTI)
#define UART_BASE dev_base
#else
#define UART_BASE ACTING_UART0_BASE
#endif
#if defined(CONFIG_405EP) && defined(CFG_EXT_SERIAL_CLOCK)
#error "External serial clock not supported on AMCC PPC405EP!"
#endif
#define UART_RBR 0x00
#define UART_THR 0x00
#define UART_IER 0x01
#define UART_IIR 0x02
#define UART_FCR 0x02
#define UART_LCR 0x03
#define UART_MCR 0x04
#define UART_LSR 0x05
#define UART_MSR 0x06
#define UART_SCR 0x07
#define UART_DLL 0x00
#define UART_DLM 0x01
/*-----------------------------------------------------------------------------+
| Line Status Register.
+-----------------------------------------------------------------------------*/
/*#define asyncLSRport1 ACTING_UART0_BASE+0x05 */
#define asyncLSRDataReady1 0x01
#define asyncLSROverrunError1 0x02
#define asyncLSRParityError1 0x04
#define asyncLSRFramingError1 0x08
#define asyncLSRBreakInterrupt1 0x10
#define asyncLSRTxHoldEmpty1 0x20
#define asyncLSRTxShiftEmpty1 0x40
#define asyncLSRRxFifoError1 0x80
/*-----------------------------------------------------------------------------+
| Miscellanies defines.
+-----------------------------------------------------------------------------*/
/*#define asyncTxBufferport1 ACTING_UART0_BASE+0x00 */
/*#define asyncRxBufferport1 ACTING_UART0_BASE+0x00 */
#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
/*-----------------------------------------------------------------------------+
| Fifo
+-----------------------------------------------------------------------------*/
typedef struct {
char *rx_buffer;
ulong rx_put;
ulong rx_get;
} serial_buffer_t;
volatile static serial_buffer_t buf_info;
#endif
#if defined(CONFIG_440) && !defined(CFG_EXT_SERIAL_CLOCK)
static void serial_divs (int baudrate, unsigned long *pudiv,
unsigned short *pbdiv )
{
sys_info_t sysinfo;
unsigned long div; /* total divisor udiv * bdiv */
unsigned long umin; /* minimum udiv */
unsigned short diff; /* smallest diff */
unsigned long udiv; /* best udiv */
unsigned short idiff; /* current diff */
unsigned short ibdiv; /* current bdiv */
unsigned long i;
unsigned long est; /* current estimate */
get_sys_info( &sysinfo );
udiv = 32; /* Assume lowest possible serial clk */
div = sysinfo.freqPLB/(16*baudrate); /* total divisor */
umin = sysinfo.pllOpbDiv<<1; /* 2 x OPB divisor */
diff = 32; /* highest possible */
/* i is the test udiv value -- start with the largest
* possible (32) to minimize serial clock and constrain
* search to umin.
*/
for( i = 32; i > umin; i-- ){
ibdiv = div/i;
est = i * ibdiv;
idiff = (est > div) ? (est-div) : (div-est);
if( idiff == 0 ){
udiv = i;
break; /* can't do better */
}
else if( idiff < diff ){
udiv = i; /* best so far */
diff = idiff; /* update lowest diff*/
}
}
*pudiv = udiv;
*pbdiv = div/udiv;
}
#endif /* defined(CONFIG_440) && !defined(CFG_EXT_SERIAL_CLK) */
/*
* Minimal serial functions needed to use one of the SMC ports
* as serial console interface.
*/
#if defined(CONFIG_440)
#if defined(CONFIG_SERIAL_MULTI)
int serial_init_dev (unsigned long dev_base)
#else
int serial_init(void)
#endif
{
unsigned long reg;
unsigned long udiv;
unsigned short bdiv;
volatile char val;
#ifdef CFG_EXT_SERIAL_CLOCK
unsigned long tmp;
#endif
MFREG(UART0_SDR, reg);
reg &= ~CR0_MASK;
#ifdef CFG_EXT_SERIAL_CLOCK
reg |= CR0_EXTCLK_ENA;
udiv = 1;
tmp = gd->baudrate * 16;
bdiv = (CFG_EXT_SERIAL_CLOCK + tmp / 2) / tmp;
#else
/* For 440, the cpu clock is on divider chain A, UART on divider
* chain B ... so cpu clock is irrelevant. Get the "optimized"
* values that are subject to the 1/2 opb clock constraint
*/
serial_divs (gd->baudrate, &udiv, &bdiv);
#endif
reg |= (udiv - UDIV_SUBTRACT) << CR0_UDIV_POS; /* set the UART divisor */
/*
* Configure input clock to baudrate generator for all
* available serial ports here
*/
MTREG(UART0_SDR, reg);
#if defined(UART1_SDR)
MTREG(UART1_SDR, reg);
#endif
#if defined(UART2_SDR)
MTREG(UART2_SDR, reg);
#endif
#if defined(UART3_SDR)
MTREG(UART3_SDR, reg);
#endif
out8(UART_BASE + UART_LCR, 0x80); /* set DLAB bit */
out8(UART_BASE + UART_DLL, bdiv); /* set baudrate divisor */
out8(UART_BASE + UART_DLM, bdiv >> 8); /* set baudrate divisor */
out8(UART_BASE + UART_LCR, 0x03); /* clear DLAB; set 8 bits, no parity */
out8(UART_BASE + UART_FCR, 0x00); /* disable FIFO */
out8(UART_BASE + UART_MCR, 0x00); /* no modem control DTR RTS */
val = in8(UART_BASE + UART_LSR); /* clear line status */
val = in8(UART_BASE + UART_RBR); /* read receive buffer */
out8(UART_BASE + UART_SCR, 0x00); /* set scratchpad */
out8(UART_BASE + UART_IER, 0x00); /* set interrupt enable reg */
return (0);
}
#else /* !defined(CONFIG_440) */
#if defined(CONFIG_SERIAL_MULTI)
int serial_init_dev (unsigned long dev_base)
#else
int serial_init (void)
#endif
{
unsigned long reg;
unsigned long tmp;
unsigned long clk;
unsigned long udiv;
unsigned short bdiv;
volatile char val;
#ifdef CONFIG_405EP
reg = mfdcr(cpc0_ucr) & ~(UCR0_MASK | UCR1_MASK);
clk = gd->cpu_clk;
tmp = CFG_BASE_BAUD * 16;
udiv = (clk + tmp / 2) / tmp;
if (udiv > UDIV_MAX) /* max. n bits for udiv */
udiv = UDIV_MAX;
reg |= (udiv) << UCR0_UDIV_POS; /* set the UART divisor */
reg |= (udiv) << UCR1_UDIV_POS; /* set the UART divisor */
mtdcr (cpc0_ucr, reg);
#else /* CONFIG_405EP */
reg = mfdcr(cntrl0) & ~CR0_MASK;
#ifdef CFG_EXT_SERIAL_CLOCK
clk = CFG_EXT_SERIAL_CLOCK;
udiv = 1;
reg |= CR0_EXTCLK_ENA;
#else
clk = gd->cpu_clk;
#ifdef CFG_405_UART_ERRATA_59
udiv = 31; /* Errata 59: stuck at 31 */
#else
tmp = CFG_BASE_BAUD * 16;
udiv = (clk + tmp / 2) / tmp;
if (udiv > UDIV_MAX) /* max. n bits for udiv */
udiv = UDIV_MAX;
#endif
#endif
reg |= (udiv - 1) << CR0_UDIV_POS; /* set the UART divisor */
mtdcr (cntrl0, reg);
#endif /* CONFIG_405EP */
tmp = gd->baudrate * udiv * 16;
bdiv = (clk + tmp / 2) / tmp;
out8(UART_BASE + UART_LCR, 0x80); /* set DLAB bit */
out8(UART_BASE + UART_DLL, bdiv); /* set baudrate divisor */
out8(UART_BASE + UART_DLM, bdiv >> 8); /* set baudrate divisor */
out8(UART_BASE + UART_LCR, 0x03); /* clear DLAB; set 8 bits, no parity */
out8(UART_BASE + UART_FCR, 0x00); /* disable FIFO */
out8(UART_BASE + UART_MCR, 0x00); /* no modem control DTR RTS */
val = in8(UART_BASE + UART_LSR); /* clear line status */
val = in8(UART_BASE + UART_RBR); /* read receive buffer */
out8(UART_BASE + UART_SCR, 0x00); /* set scratchpad */
out8(UART_BASE + UART_IER, 0x00); /* set interrupt enable reg */
return (0);
}
#endif /* if defined(CONFIG_440) */
#if defined(CONFIG_SERIAL_MULTI)
void serial_setbrg_dev (unsigned long dev_base)
#else
void serial_setbrg (void)
#endif
{
#if defined(CONFIG_SERIAL_MULTI)
serial_init_dev(dev_base);
#else
serial_init();
#endif
}
#if defined(CONFIG_SERIAL_MULTI)
void serial_putc_dev (unsigned long dev_base, const char c)
#else
void serial_putc (const char c)
#endif
{
int i;
if (c == '\n')
#if defined(CONFIG_SERIAL_MULTI)
serial_putc_dev (dev_base, '\r');
#else
serial_putc ('\r');
#endif
/* check THRE bit, wait for transmiter available */
for (i = 1; i < 3500; i++) {
if ((in8 (UART_BASE + UART_LSR) & 0x20) == 0x20)
break;
udelay (100);
}
out8 (UART_BASE + UART_THR, c); /* put character out */
}
#if defined(CONFIG_SERIAL_MULTI)
void serial_puts_dev (unsigned long dev_base, const char *s)
#else
void serial_puts (const char *s)
#endif
{
while (*s) {
#if defined(CONFIG_SERIAL_MULTI)
serial_putc_dev (dev_base, *s++);
#else
serial_putc (*s++);
#endif
}
}
#if defined(CONFIG_SERIAL_MULTI)
int serial_getc_dev (unsigned long dev_base)
#else
int serial_getc (void)
#endif
{
unsigned char status = 0;
while (1) {
#if defined(CONFIG_HW_WATCHDOG)
WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */
#endif /* CONFIG_HW_WATCHDOG */
status = in8 (UART_BASE + UART_LSR);
if ((status & asyncLSRDataReady1) != 0x0) {
break;
}
if ((status & ( asyncLSRFramingError1 |
asyncLSROverrunError1 |
asyncLSRParityError1 |
asyncLSRBreakInterrupt1 )) != 0) {
out8 (UART_BASE + UART_LSR,
asyncLSRFramingError1 |
asyncLSROverrunError1 |
asyncLSRParityError1 |
asyncLSRBreakInterrupt1);
}
}
return (0x000000ff & (int) in8 (UART_BASE));
}
#if defined(CONFIG_SERIAL_MULTI)
int serial_tstc_dev (unsigned long dev_base)
#else
int serial_tstc (void)
#endif
{
unsigned char status;
status = in8 (UART_BASE + UART_LSR);
if ((status & asyncLSRDataReady1) != 0x0) {
return (1);
}
if ((status & ( asyncLSRFramingError1 |
asyncLSROverrunError1 |
asyncLSRParityError1 |
asyncLSRBreakInterrupt1 )) != 0) {
out8 (UART_BASE + UART_LSR,
asyncLSRFramingError1 |
asyncLSROverrunError1 |
asyncLSRParityError1 |
asyncLSRBreakInterrupt1);
}
return 0;
}
#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
void serial_isr (void *arg)
{
int space;
int c;
const int rx_get = buf_info.rx_get;
int rx_put = buf_info.rx_put;
if (rx_get <= rx_put) {
space = CONFIG_SERIAL_SOFTWARE_FIFO - (rx_put - rx_get);
} else {
space = rx_get - rx_put;
}
while (serial_tstc_dev (ACTING_UART0_BASE)) {
c = serial_getc_dev (ACTING_UART0_BASE);
if (space) {
buf_info.rx_buffer[rx_put++] = c;
space--;
}
if (rx_put == CONFIG_SERIAL_SOFTWARE_FIFO)
rx_put = 0;
if (space < CONFIG_SERIAL_SOFTWARE_FIFO / 4) {
/* Stop flow by setting RTS inactive */
out8 (ACTING_UART0_BASE + UART_MCR,
in8 (ACTING_UART0_BASE + UART_MCR) & (0xFF ^ 0x02));
}
}
buf_info.rx_put = rx_put;
}
void serial_buffered_init (void)
{
serial_puts ("Switching to interrupt driven serial input mode.\n");
buf_info.rx_buffer = malloc (CONFIG_SERIAL_SOFTWARE_FIFO);
buf_info.rx_put = 0;
buf_info.rx_get = 0;
if (in8 (ACTING_UART0_BASE + UART_MSR) & 0x10) {
serial_puts ("Check CTS signal present on serial port: OK.\n");
} else {
serial_puts ("WARNING: CTS signal not present on serial port.\n");
}
irq_install_handler ( VECNUM_U0 /*UART0 */ /*int vec */ ,
serial_isr /*interrupt_handler_t *handler */ ,
(void *) &buf_info /*void *arg */ );
/* Enable "RX Data Available" Interrupt on UART */
/* out8(ACTING_UART0_BASE + UART_IER, in8(ACTING_UART0_BASE + UART_IER) |0x01); */
out8 (ACTING_UART0_BASE + UART_IER, 0x01);
/* Set DTR active */
out8 (ACTING_UART0_BASE + UART_MCR, in8 (ACTING_UART0_BASE + UART_MCR) | 0x01);
/* Start flow by setting RTS active */
out8 (ACTING_UART0_BASE + UART_MCR, in8 (ACTING_UART0_BASE + UART_MCR) | 0x02);
/* Setup UART FIFO: RX trigger level: 4 byte, Enable FIFO */
out8 (ACTING_UART0_BASE + UART_FCR, (1 << 6) | 1);
}
void serial_buffered_putc (const char c)
{
/* Wait for CTS */
#if defined(CONFIG_HW_WATCHDOG)
while (!(in8 (ACTING_UART0_BASE + UART_MSR) & 0x10))
WATCHDOG_RESET ();
#else
while (!(in8 (ACTING_UART0_BASE + UART_MSR) & 0x10));
#endif
serial_putc (c);
}
void serial_buffered_puts (const char *s)
{
serial_puts (s);
}
int serial_buffered_getc (void)
{
int space;
int c;
int rx_get = buf_info.rx_get;
int rx_put;
#if defined(CONFIG_HW_WATCHDOG)
while (rx_get == buf_info.rx_put)
WATCHDOG_RESET ();
#else
while (rx_get == buf_info.rx_put);
#endif
c = buf_info.rx_buffer[rx_get++];
if (rx_get == CONFIG_SERIAL_SOFTWARE_FIFO)
rx_get = 0;
buf_info.rx_get = rx_get;
rx_put = buf_info.rx_put;
if (rx_get <= rx_put) {
space = CONFIG_SERIAL_SOFTWARE_FIFO - (rx_put - rx_get);
} else {
space = rx_get - rx_put;
}
if (space > CONFIG_SERIAL_SOFTWARE_FIFO / 2) {
/* Start flow by setting RTS active */
out8 (ACTING_UART0_BASE + UART_MCR, in8 (ACTING_UART0_BASE + UART_MCR) | 0x02);
}
return c;
}
int serial_buffered_tstc (void)
{
return (buf_info.rx_get != buf_info.rx_put) ? 1 : 0;
}
#endif /* CONFIG_SERIAL_SOFTWARE_FIFO */
#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
/*
AS HARNOIS : according to CONFIG_KGDB_SER_INDEX kgdb uses serial port
number 0 or number 1
- if CONFIG_KGDB_SER_INDEX = 1 => serial port number 0 :
configuration has been already done
- if CONFIG_KGDB_SER_INDEX = 2 => serial port number 1 :
configure port 1 for serial I/O with rate = CONFIG_KGDB_BAUDRATE
*/
#if (CONFIG_KGDB_SER_INDEX & 2)
void kgdb_serial_init (void)
{
volatile char val;
unsigned short br_reg;
get_clocks ();
br_reg = (((((gd->cpu_clk / 16) / 18) * 10) / CONFIG_KGDB_BAUDRATE) +
5) / 10;
/*
* Init onboard 16550 UART
*/
out8 (ACTING_UART1_BASE + UART_LCR, 0x80); /* set DLAB bit */
out8 (ACTING_UART1_BASE + UART_DLL, (br_reg & 0x00ff)); /* set divisor for 9600 baud */
out8 (ACTING_UART1_BASE + UART_DLM, ((br_reg & 0xff00) >> 8)); /* set divisor for 9600 baud */
out8 (ACTING_UART1_BASE + UART_LCR, 0x03); /* line control 8 bits no parity */
out8 (ACTING_UART1_BASE + UART_FCR, 0x00); /* disable FIFO */
out8 (ACTING_UART1_BASE + UART_MCR, 0x00); /* no modem control DTR RTS */
val = in8 (ACTING_UART1_BASE + UART_LSR); /* clear line status */
val = in8 (ACTING_UART1_BASE + UART_RBR); /* read receive buffer */
out8 (ACTING_UART1_BASE + UART_SCR, 0x00); /* set scratchpad */
out8 (ACTING_UART1_BASE + UART_IER, 0x00); /* set interrupt enable reg */
}
void putDebugChar (const char c)
{
if (c == '\n')
serial_putc ('\r');
out8 (ACTING_UART1_BASE + UART_THR, c); /* put character out */
/* check THRE bit, wait for transfer done */
while ((in8 (ACTING_UART1_BASE + UART_LSR) & 0x20) != 0x20);
}
void putDebugStr (const char *s)
{
while (*s) {
serial_putc (*s++);
}
}
int getDebugChar (void)
{
unsigned char status = 0;
while (1) {
status = in8 (ACTING_UART1_BASE + UART_LSR);
if ((status & asyncLSRDataReady1) != 0x0) {
break;
}
if ((status & ( asyncLSRFramingError1 |
asyncLSROverrunError1 |
asyncLSRParityError1 |
asyncLSRBreakInterrupt1 )) != 0) {
out8 (ACTING_UART1_BASE + UART_LSR,
asyncLSRFramingError1 |
asyncLSROverrunError1 |
asyncLSRParityError1 |
asyncLSRBreakInterrupt1);
}
}
return (0x000000ff & (int) in8 (ACTING_UART1_BASE));
}
void kgdb_interruptible (int yes)
{
return;
}
#else /* ! (CONFIG_KGDB_SER_INDEX & 2) */
void kgdb_serial_init (void)
{
serial_printf ("[on serial] ");
}
void putDebugChar (int c)
{
serial_putc (c);
}
void putDebugStr (const char *str)
{
serial_puts (str);
}
int getDebugChar (void)
{
return serial_getc ();
}
void kgdb_interruptible (int yes)
{
return;
}
#endif /* (CONFIG_KGDB_SER_INDEX & 2) */
#endif /* CFG_CMD_KGDB */
#if defined(CONFIG_SERIAL_MULTI)
int serial0_init(void)
{
return (serial_init_dev(UART0_BASE));
}
int serial1_init(void)
{
return (serial_init_dev(UART1_BASE));
}
void serial0_setbrg (void)
{
serial_setbrg_dev(UART0_BASE);
}
void serial1_setbrg (void)
{
serial_setbrg_dev(UART1_BASE);
}
void serial0_putc(const char c)
{
serial_putc_dev(UART0_BASE,c);
}
void serial1_putc(const char c)
{
serial_putc_dev(UART1_BASE, c);
}
void serial0_puts(const char *s)
{
serial_puts_dev(UART0_BASE, s);
}
void serial1_puts(const char *s)
{
serial_puts_dev(UART1_BASE, s);
}
int serial0_getc(void)
{
return(serial_getc_dev(UART0_BASE));
}
int serial1_getc(void)
{
return(serial_getc_dev(UART1_BASE));
}
int serial0_tstc(void)
{
return (serial_tstc_dev(UART0_BASE));
}
int serial1_tstc(void)
{
return (serial_tstc_dev(UART1_BASE));
}
struct serial_device serial0_device =
{
"serial0",
"UART0",
serial0_init,
serial0_setbrg,
serial0_getc,
serial0_tstc,
serial0_putc,
serial0_puts,
};
struct serial_device serial1_device =
{
"serial1",
"UART1",
serial1_init,
serial1_setbrg,
serial1_getc,
serial1_tstc,
serial1_putc,
serial1_puts,
};
#endif /* CONFIG_SERIAL_MULTI */
#endif /* CONFIG_405GP || CONFIG_405CR */
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