usart0at91.c

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00001 /*
00002  * Copyright (C) 2005 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  */
00032 
00033 /*
00034  * $Log: usart0at91.c,v $
00035  * Revision 1.3  2006/07/05 07:55:23  haraldkipp
00036  * Daidai's support for AT91SAM7X added.
00037  *
00038  * Revision 1.2  2006/01/05 16:46:52  haraldkipp
00039  * Baudrate calculation is now based on NutGetCpuClock().
00040  *
00041  * Revision 1.1  2005/11/20 14:40:28  haraldkipp
00042  * Added interrupt driven UART driver for AT91.
00043  *
00044  */
00045 
00046 #include <cfg/os.h>
00047 #include <cfg/clock.h>
00048 #include <cfg/arch.h>
00049 
00050 #include <string.h>
00051 
00052 #include <sys/atom.h>
00053 #include <sys/event.h>
00054 #include <sys/timer.h>
00055 
00056 #include <dev/irqreg.h>
00057 #include <dev/usartat91.h>
00058 
00059 #ifndef NUT_CPU_FREQ
00060 #ifdef NUT_PLL_CPUCLK
00061 #include <dev/cy2239x.h>
00062 #else /* !NUT_PLL_CPUCLK */
00063 #define NUT_CPU_FREQ    73728000UL
00064 #endif /* !NUT_PLL_CPUCLK */
00065 #endif /* !NUT_CPU_FREQ */
00066 
00067 /*
00068  * Local function prototypes.
00069  */
00070 static u_long At91UsartGetSpeed(void);
00071 static int At91UsartSetSpeed(u_long rate);
00072 static u_char At91UsartGetDataBits(void);
00073 static int At91UsartSetDataBits(u_char bits);
00074 static u_char At91UsartGetParity(void);
00075 static int At91UsartSetParity(u_char mode);
00076 static u_char At91UsartGetStopBits(void);
00077 static int At91UsartSetStopBits(u_char bits);
00078 static u_long At91UsartGetFlowControl(void);
00079 static int At91UsartSetFlowControl(u_long flags);
00080 static u_long At91UsartGetStatus(void);
00081 static int At91UsartSetStatus(u_long flags);
00082 static u_char At91UsartGetClockMode(void);
00083 static int At91UsartSetClockMode(u_char mode);
00084 static void At91UsartTxStart(void);
00085 static void At91UsartRxStart(void);
00086 static int At91UsartInit(void);
00087 static int At91UsartDeinit(void);
00088 
00093 
00097 static USARTDCB dcb_usart0 = {
00098     0,                          /* dcb_modeflags */
00099     0,                          /* dcb_statusflags */
00100     0,                          /* dcb_rtimeout */
00101     0,                          /* dcb_wtimeout */
00102     {0, 0, 0, 0, 0, 0, 0, 0},   /* dcb_tx_rbf */
00103     {0, 0, 0, 0, 0, 0, 0, 0},   /* dcb_rx_rbf */
00104     0,                          /* dbc_last_eol */
00105     At91UsartInit,              /* dcb_init */
00106     At91UsartDeinit,            /* dcb_deinit */
00107     At91UsartTxStart,           /* dcb_tx_start */
00108     At91UsartRxStart,           /* dcb_rx_start */
00109     At91UsartSetFlowControl,    /* dcb_set_flow_control */
00110     At91UsartGetFlowControl,    /* dcb_get_flow_control */
00111     At91UsartSetSpeed,          /* dcb_set_speed */
00112     At91UsartGetSpeed,          /* dcb_get_speed */
00113     At91UsartSetDataBits,       /* dcb_set_data_bits */
00114     At91UsartGetDataBits,       /* dcb_get_data_bits */
00115     At91UsartSetParity,         /* dcb_set_parity */
00116     At91UsartGetParity,         /* dcb_get_parity */
00117     At91UsartSetStopBits,       /* dcb_set_stop_bits */
00118     At91UsartGetStopBits,       /* dcb_get_stop_bits */
00119     At91UsartSetStatus,         /* dcb_set_status */
00120     At91UsartGetStatus,         /* dcb_get_status */
00121     At91UsartSetClockMode,      /* dcb_set_clock_mode */
00122     At91UsartGetClockMode,      /* dcb_get_clock_mode */
00123 };
00124 
00140 NUTDEVICE devUsartAt910 = {
00141     0,                          /* Pointer to next device, dev_next. */
00142     {'u', 'a', 'r', 't', '0', 0, 0, 0, 0},    /* Unique device name, dev_name. */
00143     IFTYP_CHAR,                 /* Type of device, dev_type. */
00144     0,                          /* Base address, dev_base (not used). */
00145     0,                          /* First interrupt number, dev_irq (not used). */
00146     0,                          /* Interface control block, dev_icb (not used). */
00147     &dcb_usart0,                /* Driver control block, dev_dcb. */
00148     UsartInit,                  /* Driver initialization routine, dev_init. */
00149     UsartIOCtl,                 /* Driver specific control function, dev_ioctl. */
00150     UsartRead,                  /* Read from device, dev_read. */
00151     UsartWrite,                 /* Write to device, dev_write. */
00152     UsartOpen,                  /* Open a device or file, dev_open. */
00153     UsartClose,                 /* Close a device or file, dev_close. */
00154     UsartSize                   /* Request file size, dev_size. */
00155 };
00156 
00160 
00161 #define USARTn_BASE     USART0_BASE
00162 #define US_ID           US0_ID
00163 #ifdef MCU_AT91SAM7X256
00164 #define US_GPIO_PINS    0x00000003
00165 #else
00166 #define US_GPIO_PINS    0x0000C000
00167 #endif
00168 #define SIG_UART        sig_UART0
00169 #define dcb_usart       dcb_usart0
00170 
00171 #include "usartat91.c"

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