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Diffstat (limited to 'cpu/ppc4xx/serial.c')
| -rw-r--r-- | cpu/ppc4xx/serial.c | 808 |
1 files changed, 808 insertions, 0 deletions
diff --git a/cpu/ppc4xx/serial.c b/cpu/ppc4xx/serial.c new file mode 100644 index 000000000..d02ff2fa6 --- /dev/null +++ b/cpu/ppc4xx/serial.c @@ -0,0 +1,808 @@ +/* + * (C) Copyright 2000 + * 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 + */ +/*------------------------------------------------------------------------------- */ + +#include <common.h> +#include <commproc.h> +#include <asm/processor.h> +#include <watchdog.h> +#include "vecnum.h" + +#if CONFIG_SERIAL_SOFTWARE_FIFO +#include <malloc.h> +#endif + +/*****************************************************************************/ +#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) +{ + DECLARE_GLOBAL_DATA_PTR; + + 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) +{ + DECLARE_GLOBAL_DATA_PTR; + + 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_440) + +#if defined(CONFIG_440) +#define UART0_BASE CFG_PERIPHERAL_BASE + 0x00000200 +#define UART1_BASE CFG_PERIPHERAL_BASE + 0x00000300 +#define CR0_MASK 0x3fff0000 +#define CR0_EXTCLK_ENA 0x00600000 +#define CR0_UDIV_POS 16 +#else +#define UART_BASE_PTR 0xF800FFFC; /* pointer to uart base */ +#define UART0_BASE 0xef600300 +#define UART1_BASE 0xef600400 +#define CR0_MASK 0x00001fff +#define CR0_EXTCLK_ENA 0x00000c00 +#define CR0_UDIV_POS 1 +#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 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 UART0_BASE+0x00 */ +/*#define asyncRxBufferport1 UART0_BASE+0x00 */ + + +#if 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) +int serial_init (void) +{ + DECLARE_GLOBAL_DATA_PTR; + + unsigned long reg; + unsigned long udiv; + unsigned short bdiv; + volatile char val; +#ifdef CFG_EXT_SERIAL_CLOCK + unsigned long tmp; +#endif + + reg = mfdcr(cntrl0) & ~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 - 1) << CR0_UDIV_POS; /* set the UART divisor */ + mtdcr (cntrl0, reg); + + out8 (UART0_BASE + UART_LCR, 0x80); /* set DLAB bit */ + out8 (UART0_BASE + UART_DLL, bdiv); /* set baudrate divisor */ + out8 (UART0_BASE + UART_DLM, bdiv >> 8);/* set baudrate divisor */ + out8 (UART0_BASE + UART_LCR, 0x03); /* clear DLAB; set 8 bits, no parity */ + out8 (UART0_BASE + UART_FCR, 0x00); /* disable FIFO */ + out8 (UART0_BASE + UART_MCR, 0x00); /* no modem control DTR RTS */ + val = in8 (UART0_BASE + UART_LSR); /* clear line status */ + val = in8 (UART0_BASE + UART_RBR); /* read receive buffer */ + out8 (UART0_BASE + UART_SCR, 0x00); /* set scratchpad */ + out8 (UART0_BASE + UART_IER, 0x00); /* set interrupt enable reg */ + + return (0); +} + +#else /* !defined(CONFIG_440) */ + +int serial_init (void) +{ + DECLARE_GLOBAL_DATA_PTR; + + unsigned long reg; + unsigned long tmp; + unsigned long clk; + unsigned long udiv; + unsigned short bdiv; + volatile char val; + + 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; +#endif +#endif + + reg |= (udiv - 1) << CR0_UDIV_POS; /* set the UART divisor */ + mtdcr (cntrl0, reg); + + tmp = gd->baudrate * udiv * 16; + bdiv = (clk + tmp / 2) / tmp; + + out8 (UART0_BASE + UART_LCR, 0x80); /* set DLAB bit */ + out8 (UART0_BASE + UART_DLL, bdiv); /* set baudrate divisor */ + out8 (UART0_BASE + UART_DLM, bdiv >> 8);/* set baudrate divisor */ + out8 (UART0_BASE + UART_LCR, 0x03); /* clear DLAB; set 8 bits, no parity */ + out8 (UART0_BASE + UART_FCR, 0x00); /* disable FIFO */ + out8 (UART0_BASE + UART_MCR, 0x00); /* no modem control DTR RTS */ + val = in8 (UART0_BASE + UART_LSR); /* clear line status */ + val = in8 (UART0_BASE + UART_RBR); /* read receive buffer */ + out8 (UART0_BASE + UART_SCR, 0x00); /* set scratchpad */ + out8 (UART0_BASE + UART_IER, 0x00); /* set interrupt enable reg */ + + return (0); +} + +#endif /* if defined(CONFIG_440) */ + +void serial_setbrg (void) +{ + DECLARE_GLOBAL_DATA_PTR; + + unsigned long tmp; + unsigned long clk; + unsigned long udiv; + unsigned short bdiv; + +#ifdef CFG_EXT_SERIAL_CLOCK + clk = CFG_EXT_SERIAL_CLOCK; +#else + clk = gd->cpu_clk; +#endif + udiv = ((mfdcr (cntrl0) & 0x3e) >> 1) + 1; + tmp = gd->baudrate * udiv * 16; + bdiv = (clk + tmp / 2) / tmp; + + out8 (UART0_BASE + UART_LCR, 0x80); /* set DLAB bit */ + out8 (UART0_BASE + UART_DLL, bdiv); /* set baudrate divisor */ + out8 (UART0_BASE + UART_DLM, bdiv >> 8);/* set baudrate divisor */ + out8 (UART0_BASE + UART_LCR, 0x03); /* clear DLAB; set 8 bits, no parity */ +} + + +void serial_putc (const char c) +{ + int i; + + if (c == '\n') + serial_putc ('\r'); + + /* check THRE bit, wait for transmiter available */ + for (i = 1; i < 3500; i++) { + if ((in8 (UART0_BASE + UART_LSR) & 0x20) == 0x20) + break; + udelay (100); + } + out8 (UART0_BASE + UART_THR, c); /* put character out */ +} + + +void serial_puts (const char *s) +{ + while (*s) { + serial_putc (*s++); + } +} + + +int serial_getc () +{ + unsigned char status = 0; + + while (1) { +#if defined(CONFIG_HW_WATCHDOG) + WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */ +#endif /* CONFIG_HW_WATCHDOG */ + status = in8 (UART0_BASE + UART_LSR); + if ((status & asyncLSRDataReady1) != 0x0) { + break; + } + if ((status & ( asyncLSRFramingError1 | + asyncLSROverrunError1 | + asyncLSRParityError1 | + asyncLSRBreakInterrupt1 )) != 0) { + out8 (UART0_BASE + UART_LSR, + asyncLSRFramingError1 | + asyncLSROverrunError1 | + asyncLSRParityError1 | + asyncLSRBreakInterrupt1); + } + } + return (0x000000ff & (int) in8 (UART0_BASE)); +} + + +int serial_tstc () +{ + unsigned char status; + + status = in8 (UART0_BASE + UART_LSR); + if ((status & asyncLSRDataReady1) != 0x0) { + return (1); + } + if ((status & ( asyncLSRFramingError1 | + asyncLSROverrunError1 | + asyncLSRParityError1 | + asyncLSRBreakInterrupt1 )) != 0) { + out8 (UART0_BASE + UART_LSR, + asyncLSRFramingError1 | + asyncLSROverrunError1 | + asyncLSRParityError1 | + asyncLSRBreakInterrupt1); + } + return 0; +} + + +#if 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 ()) { + c = serial_getc (); + 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 (UART0_BASE + UART_MCR, + in8 (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 (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(UART0_BASE + UART_IER, in8(UART0_BASE + UART_IER) |0x01); */ + out8 (UART0_BASE + UART_IER, 0x01); + /* Set DTR active */ + out8 (UART0_BASE + UART_MCR, in8 (UART0_BASE + UART_MCR) | 0x01); + /* Start flow by setting RTS active */ + out8 (UART0_BASE + UART_MCR, in8 (UART0_BASE + UART_MCR) | 0x02); + /* Setup UART FIFO: RX trigger level: 4 byte, Enable FIFO */ + out8 (UART0_BASE + UART_FCR, (1 << 6) | 1); +} + +void serial_buffered_putc (const char c) +{ + /* Wait for CTS */ +#if defined(CONFIG_HW_WATCHDOG) + while (!(in8 (UART0_BASE + UART_MSR) & 0x10)) + WATCHDOG_RESET (); +#else + while (!(in8 (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 (UART0_BASE + UART_MCR, in8 (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) +{ + DECLARE_GLOBAL_DATA_PTR; + + 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 (UART1_BASE + UART_LCR, 0x80); /* set DLAB bit */ + out8 (UART1_BASE + UART_DLL, (br_reg & 0x00ff)); /* set divisor for 9600 baud */ + out8 (UART1_BASE + UART_DLM, ((br_reg & 0xff00) >> 8)); /* set divisor for 9600 baud */ + out8 (UART1_BASE + UART_LCR, 0x03); /* line control 8 bits no parity */ + out8 (UART1_BASE + UART_FCR, 0x00); /* disable FIFO */ + out8 (UART1_BASE + UART_MCR, 0x00); /* no modem control DTR RTS */ + val = in8 (UART1_BASE + UART_LSR); /* clear line status */ + val = in8 (UART1_BASE + UART_RBR); /* read receive buffer */ + out8 (UART1_BASE + UART_SCR, 0x00); /* set scratchpad */ + out8 (UART1_BASE + UART_IER, 0x00); /* set interrupt enable reg */ +} + + +void putDebugChar (const char c) +{ + if (c == '\n') + serial_putc ('\r'); + + out8 (UART1_BASE + UART_THR, c); /* put character out */ + + /* check THRE bit, wait for transfer done */ + while ((in8 (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 (UART1_BASE + UART_LSR); + if ((status & asyncLSRDataReady1) != 0x0) { + break; + } + if ((status & ( asyncLSRFramingError1 | + asyncLSROverrunError1 | + asyncLSRParityError1 | + asyncLSRBreakInterrupt1 )) != 0) { + out8 (UART1_BASE + UART_LSR, + asyncLSRFramingError1 | + asyncLSROverrunError1 | + asyncLSRParityError1 | + asyncLSRBreakInterrupt1); + } + } + return (0x000000ff & (int) in8 (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 */ + +#endif /* CONFIG_405GP || CONFIG_405CR */ |