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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [char/] [mbus.c] - Blame information for rev 1765

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/************************************************************************/
/*                                                                      */
/*  mbus.c - functions for the mbus driver                              */
/*                                                                      */
/*  (C) Copyright 1999, Martin Floeer (mfloeer@axcent.de)               */      /*                                                                      */
/*                                                                      */
/************************************************************************/
 
 
 
 
#ifndef __KERNEL__
#define __KERNEL__
#endif
#include <linux/kernel.h>
#include <linux/malloc.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/fcntl.h>
#include <linux/sched.h>
 
#include <asm/coldfire.h>
#include <asm/types.h>
#include <asm/mcfsim.h>
#include <asm/mcfmbus.h>
 
#include <asm/system.h>
#include <asm/segment.h>
 
#include "mbus.h"
 
 
 
int mbus_major = MBUS_MAJOR;
int mbus_nr_devs = MBUS_NR_DEVS;
 
Mbus_Dev *mbus_devices;
 
 
volatile char *mbus_base=(char*) (MCF_MBAR + MCFMBUS_BASE);
 
 
static unsigned char mbus_transfer_complete(void)
{
        if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_MCF) != 0) return(0x1);
        return(0x0);
}
 
 
static unsigned char mbus_idle(void)
{
        if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_MBB) == 0) return(0x1);
        return(0x0);
}
 
static unsigned char mbus_interrupt_pending(void)
{
        if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_MIF) != 0) return(0x1);
        return(0x0);
}
 
 
static void mbus_clear_interrupt(void)
{
        *(mbus_base + MCFMBUS_MBSR) = *(mbus_base + MCFMBUS_MBSR) & ~MCFMBUS_MBSR_MIF;
}
 
 
static unsigned char mbus_arbitration_lost(void)
{
        if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_MAL) != 0) return(0x1);
        return(0x0);
}
 
 
static unsigned char mbus_received_acknowledge(void)
{
        if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_RXAK) == 0) return(0x1);
        return(0x0);
}
 
 
static void mbus_set_address(unsigned char address)
{
        *(mbus_base + MCFMBUS_MADR) = MCFMBUS_MADR_ADDR(address);
}
 
 
static void mbus_set_clock(unsigned char clock)
{
        *(mbus_base + MCFMBUS_MFDR) = clock;
}
 
static void mbus_set_direction(unsigned char state)
{
        if(state == 0x1) *(mbus_base + MCFMBUS_MBCR) = *(mbus_base + MCFMBUS_MBCR) | MCFMBUS_MBCR_MTX;  /* transmit mode */
                else *(mbus_base + MCFMBUS_MBCR) = *(mbus_base + MCFMBUS_MBCR) & ~MCFMBUS_MBCR_MTX;                             /* transmit mode */
}
 
 
static void mbus_set_mode(unsigned char state)
{
        if(state == 0x1) *(mbus_base + MCFMBUS_MBCR) = *(mbus_base + MCFMBUS_MBCR) | MCFMBUS_MBCR_MSTA; /* master mode */
                else *(mbus_base + MCFMBUS_MBCR) = *(mbus_base + MCFMBUS_MBCR) & ~MCFMBUS_MBCR_MSTA;                            /* slave mode */
}
 
 
static void mbus_repeat_start(void)
{
        *(mbus_base + MCFMBUS_MBCR) = *(mbus_base + MCFMBUS_MBCR) | MCFMBUS_MBCR_RSTA;  /* generate repeat start cycle */
}
 
static int mbus_error()
{
        if(mbus_arbitration_lost() == 0x1) return(-1);
        if(mbus_received_acknowledge() == 0x0) return (-2);
        return(0);
}
 
void mbus_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
 
 
        int error;
 
        mbus_clear_interrupt();
 
        error = mbus_error();
        if(error!=0)
        {
                MBUS_STATE = error;
                mbus_set_mode(MBUS_SLAVE);                                      /* generate stop signal */
                return;
        }
 
        if(MBUS_MODE == 0x1)                                                    /* which mbus mode*/
        {
                                                /*** transmit ***/
                if(MBUS_DATA_COUNT < 0)
                {
 
                        *(mbus_base + MCFMBUS_MBDR) = MBUS_DEST_ADDRESS_BUFFER;
                        /* put destination address to mbus */
                        MBUS_DATA_COUNT++;
                }
                else
                {
                        if(MBUS_DATA_COUNT != MBUS_DATA_NUMBER)                 /* last byte transmit ? */
                        {
 
 
                                *(mbus_base + MCFMBUS_MBDR) = *MBUS_DATA++;     /* put data to mbus *//* so funkt es */
 
                                MBUS_DATA_COUNT++;
                        }
                        else
                        {
 
                                mbus_set_mode(MBUS_SLAVE);                      /* generate stop signal */
                                MBUS_STATE = MBUS_STATE_IDLE;
                        }
                }
        }
        else
        {                                                                                                                               /*** receive ***/
                if(MBUS_DATA_COUNT < 0)
                {
                        if(MBUS_DATA_COUNT == -2)
                        {
                                *(mbus_base + MCFMBUS_MBDR) =
                                MBUS_DEST_ADDRESS_BUFFER;       /* put
                                destination address to mbus */
                                MBUS_DATA_COUNT++;
                        }
                        else
                        {
                                mbus_set_direction(MBUS_RECEIVE);                                       /* receive mbus */
                                *MBUS_DATA = *(mbus_base + MCFMBUS_MBDR);                                               /* dummy read from mbus */
                                MBUS_DATA_COUNT++;
                        }
                }
                else
                {
                        if(MBUS_DATA_COUNT != MBUS_DATA_NUMBER)                                 /* last byte receive ? */
                        {
                                *MBUS_DATA++ = *(mbus_base + MCFMBUS_MBDR);                                     /* read data from mbus */
                                MBUS_DATA_COUNT++;
                        }
                        else
                        {
                                mbus_set_mode(MBUS_SLAVE);                                                      /* generate stop signal */
                                MBUS_STATE = MBUS_STATE_IDLE;
                        }
 
 
                }
        }
}
 
/*
 * This function starts the transmission of one char
 *
 * Paramters:
 *  slave_address1                      7 bit Slave address (a7,a6,a5,a4,a3,a2,a1,X)
 *  data_address                        8 bit Slave destination data Address
 *  buf                                 source data buffer
 * Returns:
 *                                                      None
 */
void mbus_putchar(unsigned char slave_address, unsigned char data_address, char
*buf)
{
        while(mbus_idle() == 0x0);                                                              /* wait for bus idle */
        MBUS_STATE = MBUS_STATE_BUSY;
 
 
        mbus_set_direction(MBUS_TRANSMIT);                                                              /* transmit mbus */
        mbus_set_mode(MBUS_MASTER);
 
        MBUS_MODE = MBUS_TRANSMIT;
        MBUS_DATA_COUNT = -1;                                                                   /* INIT data counter */
        MBUS_DATA_NUMBER = 1;                                                                   /* INIT data number */
        MBUS_DEST_ADDRESS_BUFFER = data_address;
        MBUS_DATA = buf;
 
        *(mbus_base + MCFMBUS_MBDR) = slave_address & ~MCFMBUS_MBDR_READ;       /* send mbus_address and write access*/
}
 
/*
 * This function starts the receiving of one char
 *
 * Paramters:
 *  slave_address1                      7 bit Slave address (a7,a6,a5,a4,a3,a2,a1,X)
 *  data_address                        8 bit Slave source data Address
 *  buf                                 destination data buffer
 * Returns:
 *                                                      None
 */
void mbus_getchar(unsigned char slave_address, unsigned char data_address, char *buf)
{
        while(mbus_idle() == 0x0);                                      /* wait for bus idle */
 
        MBUS_STATE = MBUS_STATE_BUSY;
 
        mbus_set_direction(MBUS_TRANSMIT);                              /* transmit mbus */
        mbus_set_mode(MBUS_MASTER);
 
        MBUS_MODE = MBUS_RECEIVE;
        MBUS_DATA_COUNT = -2;                                           /* INIT data counter */
        MBUS_DATA_NUMBER = 1;                                           /* INIT data number */
        MBUS_DEST_ADDRESS_BUFFER = data_address;
        MBUS_DATA = buf;
 
        *(mbus_base + MCFMBUS_MBDR) = slave_address & ~MCFMBUS_MBDR_READ;       /* send mbus_address and write access*/
}
 
/*
 * This function starts the transmission of n char
 *
 * Paramters:
 *  slave_address1                      7 bit Slave address (a7,a6,a5,a4,a3,a2,a1,X)
 *  dest_address                        8 bit Slave destination data Address
 *  buf                                 source data buffer
 * Returns:
 *                                                      None
 */
void mbus_putchars(unsigned char slave_address, unsigned char data_address, char *buf, int number)
{
        while(mbus_idle() == 0x0);                                      /* wait for bus idle */
        MBUS_STATE = MBUS_STATE_BUSY;
 
        mbus_set_direction(MBUS_TRANSMIT);                                                              /* transmit mbus */
        mbus_set_mode(MBUS_MASTER);
        MBUS_MODE = MBUS_TRANSMIT;
        MBUS_DATA_COUNT = -1;                                                                                           /* INIT data counter */
        MBUS_DATA_NUMBER = number;                                                                                      /* INIT data number */
        MBUS_DEST_ADDRESS_BUFFER = data_address;
        MBUS_DATA = buf;
        *(mbus_base + MCFMBUS_MBDR) = slave_address & ~MCFMBUS_MBDR_READ;       /* send mbus_address and write access*/
 
}
 
 
unsigned char mbus_busy_event(void)
{
/*      unsigned char state;
 
 
        if(MBUS_STATE == MBUS_STATE_BUSY) state = 0x1;
                else state= 0x0;
 
        return(state);*/
 
        if(MBUS_STATE == MBUS_STATE_BUSY) return 0x1;
 
        return 0x0;
}
 
 
 
int mbus_open (struct inode * inode, struct file *filp)
{
 
        int minor = MINOR(inode->i_rdev);
        Mbus_Dev *dev;
        if (minor >= mbus_nr_devs) {
                        return -ENODEV;
                        printk("Error: no such device \n");
                        }
 
 
        dev = &mbus_devices[minor];
        dev->name="mbus";
        /*Initialisierung mbus*/
 
        mbus_set_clock(MCFMBUS_CLK);
 
        mbus_set_address(MCFMBUS_ADDRESS);
 
        *(mbus_base + MCFMBUS_MBCR) = MCFMBUS_MBCR_MEN ;        /* first enable M-BUS   */
                                                        /* Interrupt disable    */
                                                        /* set to Slave mode    */
                                                        /* set to receive mode  */
                                                        /* with acknowledge     */
        if (request_irq(MCFMBUS_IRQ_VECTOR, mbus_interrupt, 0, dev->name, NULL)) printk(" kein Interrupt\n");
        *(volatile unsigned char*)(MCF_MBAR + MCFSIM_ICR3) = MCFMBUS_IRQ_LEVEL | MCFSIM_ICR_AUTOVEC;    /* set MBUS IRQ-Level and autovector */
        mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_MBUS);
        *(mbus_base + MCFMBUS_MBCR) = *(mbus_base + MCFMBUS_MBCR) | MCFMBUS_MBCR_MIEN ;         /* Interrupt enable*/
 
        /*Ender Initialisierung mbus*/
 
        return 0;
}
 
mbus_release(struct inode * inode, struct file *filp)
{
*(volatile unsigned char*)(MCF_MBAR + MCFSIM_ICR3)= 0x0;
mcf_setimr(mcf_getimr()  | MCFSIM_IMR_MBUS);
free_irq(MCFMBUS_IRQ_VECTOR, NULL);
}
/*
* Using the read function:      first Byte of buf slave address
*                               second Byte of buf dest address
*                               following Bytes read buffer
*/
 
read_write_t mbus_read (struct inode *inode, struct file *filp, char *buf,
count_t count)
{
 
        Mbus_Dev *dev= filp->private_data;
        char address=*buf++, dest_address=*buf++;
        if (count> 3)   {
                        printk(KERN_ERR "nur ein Zeichen Lesen\n");
                        return -1;
                        }
        dev->usage++;
 
        mbus_getchar(address, dest_address, buf);
 
        dev->usage--;
        return 0;
}
 
/*
* Using the write function:             first Byte of buf slave address
*                                       second Byte of buf dest address
*                                       following Bytes  write buffer
*/
 
read_write_t mbus_write (struct inode *inode, struct file *filp, char *buf,
count_t count)
{
        Mbus_Dev *dev= filp->private_data;
 
        char address=*buf++, dest_address=*buf++;
        count = count -2;
 
        dev->usage++;
 
        mbus_putchars(address, dest_address, buf, count);
 
        dev->usage--;
        return 0;
}
 
 
struct file_operations mbus_fops =
{
NULL,
mbus_read,
mbus_write,
NULL,
NULL,
NULL,
NULL,
mbus_open,
mbus_release,
 
};
 
int mbus_init(void)
{
        int result, i;
        result = register_chrdev(mbus_major, "mbus",  &mbus_fops);
 
        if (result<0)
                {
                printk("keine Major\n");
                }
 
 
        mbus_devices = kmalloc(mbus_nr_devs * sizeof(Mbus_Dev), GFP_KERNEL);
 
        if (!mbus_devices)
                {
                result = -ENOMEM;
                goto fail_malloc;
                }
 
 
        return 0;
 
        fail_malloc:    unregister_chrdev(mbus_major, "mbus");
                        return result;
 
}

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [char/] [mbus.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1626	jcastillo	`/************************************************************************/`
2			`/* */`
3			`/* mbus.c - functions for the mbus driver */`
4			`/* */`
5			`/* (C) Copyright 1999, Martin Floeer (mfloeer@axcent.de) / / */`
6			`/* */`
7			`/************************************************************************/`
8
9
10
11
12			`#ifndef __KERNEL__`
13			`#define __KERNEL__`
14			`#endif`
15			`#include <linux/kernel.h>`
16			`#include <linux/malloc.h>`
17			`#include <linux/fs.h>`
18			`#include <linux/errno.h>`
19			`#include <linux/types.h>`
20			`#include <linux/proc_fs.h>`
21			`#include <linux/fcntl.h>`
22			`#include <linux/sched.h>`
23
24			`#include <asm/coldfire.h>`
25			`#include <asm/types.h>`
26			`#include <asm/mcfsim.h>`
27			`#include <asm/mcfmbus.h>`
28
29			`#include <asm/system.h>`
30			`#include <asm/segment.h>`
31
32			`#include "mbus.h"`
33
34
35
36			`int mbus_major = MBUS_MAJOR;`
37			`int mbus_nr_devs = MBUS_NR_DEVS;`
38
39			`Mbus_Dev *mbus_devices;`
40
41
42			`volatile char mbus_base=(char) (MCF_MBAR + MCFMBUS_BASE);`
43
44
45			`static unsigned char mbus_transfer_complete(void)`
46			`{`
47			`if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_MCF) != 0) return(0x1);`
48			`return(0x0);`
49			`}`
50
51
52			`static unsigned char mbus_idle(void)`
53			`{`
54			`if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_MBB) == 0) return(0x1);`
55			`return(0x0);`
56			`}`
57
58			`static unsigned char mbus_interrupt_pending(void)`
59			`{`
60			`if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_MIF) != 0) return(0x1);`
61			`return(0x0);`
62			`}`
63
64
65			`static void mbus_clear_interrupt(void)`
66			`{`
67			`(mbus_base + MCFMBUS_MBSR) = (mbus_base + MCFMBUS_MBSR) & ~MCFMBUS_MBSR_MIF;`
68			`}`
69
70
71			`static unsigned char mbus_arbitration_lost(void)`
72			`{`
73			`if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_MAL) != 0) return(0x1);`
74			`return(0x0);`
75			`}`
76
77
78			`static unsigned char mbus_received_acknowledge(void)`
79			`{`
80			`if((*(mbus_base + MCFMBUS_MBSR) & MCFMBUS_MBSR_RXAK) == 0) return(0x1);`
81			`return(0x0);`
82			`}`
83
84
85			`static void mbus_set_address(unsigned char address)`
86			`{`
87			`*(mbus_base + MCFMBUS_MADR) = MCFMBUS_MADR_ADDR(address);`
88			`}`
89
90
91			`static void mbus_set_clock(unsigned char clock)`
92			`{`
93			`*(mbus_base + MCFMBUS_MFDR) = clock;`
94			`}`
95
96			`static void mbus_set_direction(unsigned char state)`
97			`{`
98			`if(state == 0x1) (mbus_base + MCFMBUS_MBCR) = (mbus_base + MCFMBUS_MBCR) \| MCFMBUS_MBCR_MTX; /* transmit mode */`
99			`else (mbus_base + MCFMBUS_MBCR) = (mbus_base + MCFMBUS_MBCR) & ~MCFMBUS_MBCR_MTX; /* transmit mode */`
100			`}`
101
102
103			`static void mbus_set_mode(unsigned char state)`
104			`{`
105			`if(state == 0x1) (mbus_base + MCFMBUS_MBCR) = (mbus_base + MCFMBUS_MBCR) \| MCFMBUS_MBCR_MSTA; /* master mode */`
106			`else (mbus_base + MCFMBUS_MBCR) = (mbus_base + MCFMBUS_MBCR) & ~MCFMBUS_MBCR_MSTA; /* slave mode */`
107			`}`
108
109
110			`static void mbus_repeat_start(void)`
111			`{`
112			`(mbus_base + MCFMBUS_MBCR) = (mbus_base + MCFMBUS_MBCR) \| MCFMBUS_MBCR_RSTA; /* generate repeat start cycle */`
113			`}`
114
115			`static int mbus_error()`
116			`{`
117			`if(mbus_arbitration_lost() == 0x1) return(-1);`
118			`if(mbus_received_acknowledge() == 0x0) return (-2);`
119			`return(0);`
120			`}`
121
122			`void mbus_interrupt(int irq, void dev_id, struct pt_regs regs)`
123			`{`
124
125
126			`int error;`
127
128			`mbus_clear_interrupt();`
129
130			`error = mbus_error();`
131			`if(error!=0)`
132			`{`
133			`MBUS_STATE = error;`
134			`mbus_set_mode(MBUS_SLAVE); /* generate stop signal */`
135			`return;`
136			`}`
137
138			`if(MBUS_MODE == 0x1) /* which mbus mode*/`
139			`{`
140			`/* transmit */`
141			`if(MBUS_DATA_COUNT < 0)`
142			`{`
143
144			`*(mbus_base + MCFMBUS_MBDR) = MBUS_DEST_ADDRESS_BUFFER;`
145			`/* put destination address to mbus */`
146			`MBUS_DATA_COUNT++;`
147			`}`
148			`else`
149			`{`
150			`if(MBUS_DATA_COUNT != MBUS_DATA_NUMBER) /* last byte transmit ? */`
151			`{`
152
153
154			`(mbus_base + MCFMBUS_MBDR) = MBUS_DATA++; /* put data to mbus // so funkt es */`
155
156			`MBUS_DATA_COUNT++;`
157			`}`
158			`else`
159			`{`
160
161			`mbus_set_mode(MBUS_SLAVE); /* generate stop signal */`
162			`MBUS_STATE = MBUS_STATE_IDLE;`
163			`}`
164			`}`
165			`}`
166			`else`
167			`{ /* receive */`
168			`if(MBUS_DATA_COUNT < 0)`
169			`{`
170			`if(MBUS_DATA_COUNT == -2)`
171			`{`
172			`*(mbus_base + MCFMBUS_MBDR) =`
173			`MBUS_DEST_ADDRESS_BUFFER; /* put`
174			`destination address to mbus */`
175			`MBUS_DATA_COUNT++;`
176			`}`
177			`else`
178			`{`
179			`mbus_set_direction(MBUS_RECEIVE); /* receive mbus */`
180			`MBUS_DATA = (mbus_base + MCFMBUS_MBDR); /* dummy read from mbus */`
181			`MBUS_DATA_COUNT++;`
182			`}`
183			`}`
184			`else`
185			`{`
186			`if(MBUS_DATA_COUNT != MBUS_DATA_NUMBER) /* last byte receive ? */`
187			`{`
188			`MBUS_DATA++ = (mbus_base + MCFMBUS_MBDR); /* read data from mbus */`
189			`MBUS_DATA_COUNT++;`
190			`}`
191			`else`
192			`{`
193			`mbus_set_mode(MBUS_SLAVE); /* generate stop signal */`
194			`MBUS_STATE = MBUS_STATE_IDLE;`
195			`}`
196
197
198			`}`
199			`}`
200			`}`
201
202			`/*`
203			`* This function starts the transmission of one char`
204			`*`
205			`* Paramters:`
206			`* slave_address1 7 bit Slave address (a7,a6,a5,a4,a3,a2,a1,X)`
207			`* data_address 8 bit Slave destination data Address`
208			`* buf source data buffer`
209			`* Returns:`
210			`* None`
211			`*/`
212			`void mbus_putchar(unsigned char slave_address, unsigned char data_address, char`
213			`*buf)`
214			`{`
215			`while(mbus_idle() == 0x0); /* wait for bus idle */`
216			`MBUS_STATE = MBUS_STATE_BUSY;`
217
218
219			`mbus_set_direction(MBUS_TRANSMIT); /* transmit mbus */`
220			`mbus_set_mode(MBUS_MASTER);`
221
222			`MBUS_MODE = MBUS_TRANSMIT;`
223			`MBUS_DATA_COUNT = -1; /* INIT data counter */`
224			`MBUS_DATA_NUMBER = 1; /* INIT data number */`
225			`MBUS_DEST_ADDRESS_BUFFER = data_address;`
226			`MBUS_DATA = buf;`
227
228			`(mbus_base + MCFMBUS_MBDR) = slave_address & ~MCFMBUS_MBDR_READ; / send mbus_address and write access*/`
229			`}`
230
231			`/*`
232			`* This function starts the receiving of one char`
233			`*`
234			`* Paramters:`
235			`* slave_address1 7 bit Slave address (a7,a6,a5,a4,a3,a2,a1,X)`
236			`* data_address 8 bit Slave source data Address`
237			`* buf destination data buffer`
238			`* Returns:`
239			`* None`
240			`*/`
241			`void mbus_getchar(unsigned char slave_address, unsigned char data_address, char *buf)`
242			`{`
243			`while(mbus_idle() == 0x0); /* wait for bus idle */`
244
245			`MBUS_STATE = MBUS_STATE_BUSY;`
246
247			`mbus_set_direction(MBUS_TRANSMIT); /* transmit mbus */`
248			`mbus_set_mode(MBUS_MASTER);`
249
250			`MBUS_MODE = MBUS_RECEIVE;`
251			`MBUS_DATA_COUNT = -2; /* INIT data counter */`
252			`MBUS_DATA_NUMBER = 1; /* INIT data number */`
253			`MBUS_DEST_ADDRESS_BUFFER = data_address;`
254			`MBUS_DATA = buf;`
255
256			`(mbus_base + MCFMBUS_MBDR) = slave_address & ~MCFMBUS_MBDR_READ; / send mbus_address and write access*/`
257			`}`
258
259			`/*`
260			`* This function starts the transmission of n char`
261			`*`
262			`* Paramters:`
263			`* slave_address1 7 bit Slave address (a7,a6,a5,a4,a3,a2,a1,X)`
264			`* dest_address 8 bit Slave destination data Address`
265			`* buf source data buffer`
266			`* Returns:`
267			`* None`
268			`*/`
269			`void mbus_putchars(unsigned char slave_address, unsigned char data_address, char *buf, int number)`
270			`{`
271			`while(mbus_idle() == 0x0); /* wait for bus idle */`
272			`MBUS_STATE = MBUS_STATE_BUSY;`
273
274			`mbus_set_direction(MBUS_TRANSMIT); /* transmit mbus */`
275			`mbus_set_mode(MBUS_MASTER);`
276			`MBUS_MODE = MBUS_TRANSMIT;`
277			`MBUS_DATA_COUNT = -1; /* INIT data counter */`
278			`MBUS_DATA_NUMBER = number; /* INIT data number */`
279			`MBUS_DEST_ADDRESS_BUFFER = data_address;`
280			`MBUS_DATA = buf;`
281			`(mbus_base + MCFMBUS_MBDR) = slave_address & ~MCFMBUS_MBDR_READ; / send mbus_address and write access*/`
282
283			`}`
284
285
286			`unsigned char mbus_busy_event(void)`
287			`{`
288			`/* unsigned char state;`
289
290
291			`if(MBUS_STATE == MBUS_STATE_BUSY) state = 0x1;`
292			`else state= 0x0;`
293
294			`return(state);*/`
295
296			`if(MBUS_STATE == MBUS_STATE_BUSY) return 0x1;`
297
298			`return 0x0;`
299			`}`
300
301
302
303			`int mbus_open (struct inode * inode, struct file *filp)`
304			`{`
305
306			`int minor = MINOR(inode->i_rdev);`
307			`Mbus_Dev *dev;`
308			`if (minor >= mbus_nr_devs) {`
309			`return -ENODEV;`
310			`printk("Error: no such device \n");`
311			`}`
312
313
314			`dev = &mbus_devices[minor];`
315			`dev->name="mbus";`
316			`/Initialisierung mbus/`
317
318			`mbus_set_clock(MCFMBUS_CLK);`
319
320			`mbus_set_address(MCFMBUS_ADDRESS);`
321
322			`(mbus_base + MCFMBUS_MBCR) = MCFMBUS_MBCR_MEN ; / first enable M-BUS */`
323			`/* Interrupt disable */`
324			`/* set to Slave mode */`
325			`/* set to receive mode */`
326			`/* with acknowledge */`
327			`if (request_irq(MCFMBUS_IRQ_VECTOR, mbus_interrupt, 0, dev->name, NULL)) printk(" kein Interrupt\n");`
328			`(volatile unsigned char)(MCF_MBAR + MCFSIM_ICR3) = MCFMBUS_IRQ_LEVEL \| MCFSIM_ICR_AUTOVEC; /* set MBUS IRQ-Level and autovector */`
329			`mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_MBUS);`
330			`(mbus_base + MCFMBUS_MBCR) = (mbus_base + MCFMBUS_MBCR) \| MCFMBUS_MBCR_MIEN ; /* Interrupt enable*/`
331
332			`/Ender Initialisierung mbus/`
333
334			`return 0;`
335			`}`
336
337			`mbus_release(struct inode * inode, struct file *filp)`
338			`{`
339			`(volatile unsigned char)(MCF_MBAR + MCFSIM_ICR3)= 0x0;`
340			`mcf_setimr(mcf_getimr() \| MCFSIM_IMR_MBUS);`
341			`free_irq(MCFMBUS_IRQ_VECTOR, NULL);`
342			`}`
343			`/*`
344			`* Using the read function: first Byte of buf slave address`
345			`* second Byte of buf dest address`
346			`* following Bytes read buffer`
347			`*/`
348
349			`read_write_t mbus_read (struct inode inode, struct file filp, char *buf,`
350			`count_t count)`
351			`{`
352
353			`Mbus_Dev *dev= filp->private_data;`
354			`char address=buf++, dest_address=buf++;`
355			`if (count> 3) {`
356			`printk(KERN_ERR "nur ein Zeichen Lesen\n");`
357			`return -1;`
358			`}`
359			`dev->usage++;`
360
361			`mbus_getchar(address, dest_address, buf);`
362
363			`dev->usage--;`
364			`return 0;`
365			`}`
366
367			`/*`
368			`* Using the write function: first Byte of buf slave address`
369			`* second Byte of buf dest address`
370			`* following Bytes write buffer`
371			`*/`
372
373			`read_write_t mbus_write (struct inode inode, struct file filp, char *buf,`
374			`count_t count)`
375			`{`
376			`Mbus_Dev *dev= filp->private_data;`
377
378			`char address=buf++, dest_address=buf++;`
379			`count = count -2;`
380
381			`dev->usage++;`
382
383			`mbus_putchars(address, dest_address, buf, count);`
384
385			`dev->usage--;`
386			`return 0;`
387			`}`
388
389
390			`struct file_operations mbus_fops =`
391			`{`
392			`NULL,`
393			`mbus_read,`
394			`mbus_write,`
395			`NULL,`
396			`NULL,`
397			`NULL,`
398			`NULL,`
399			`mbus_open,`
400			`mbus_release,`
401
402			`};`
403
404			`int mbus_init(void)`
405			`{`
406			`int result, i;`
407			`result = register_chrdev(mbus_major, "mbus", &mbus_fops);`
408
409			`if (result<0)`
410			`{`
411			`printk("keine Major\n");`
412			`}`
413
414
415			`mbus_devices = kmalloc(mbus_nr_devs * sizeof(Mbus_Dev), GFP_KERNEL);`
416
417			`if (!mbus_devices)`
418			`{`
419			`result = -ENOMEM;`
420			`goto fail_malloc;`
421			`}`
422
423
424			`return 0;`
425
426			`fail_malloc: unregister_chrdev(mbus_major, "mbus");`
427			`return result;`
428
429			`}`