diff options
Diffstat (limited to 'cpu/mpc824x/drivers/i2c')
| -rw-r--r-- | cpu/mpc824x/drivers/i2c/Makefile | 84 | ||||
| -rw-r--r-- | cpu/mpc824x/drivers/i2c/Makefile_pc | 91 | ||||
| -rw-r--r-- | cpu/mpc824x/drivers/i2c/README | 104 | ||||
| -rw-r--r-- | cpu/mpc824x/drivers/i2c/i2c.c | 284 | ||||
| -rw-r--r-- | cpu/mpc824x/drivers/i2c/i2c.h | 309 | ||||
| -rw-r--r-- | cpu/mpc824x/drivers/i2c/i2c1.c | 1243 | ||||
| -rw-r--r-- | cpu/mpc824x/drivers/i2c/i2c2.S | 52 | ||||
| -rw-r--r-- | cpu/mpc824x/drivers/i2c/i2c_export.h | 103 |
8 files changed, 284 insertions, 1986 deletions
diff --git a/cpu/mpc824x/drivers/i2c/Makefile b/cpu/mpc824x/drivers/i2c/Makefile deleted file mode 100644 index ae1a94c5366..00000000000 --- a/cpu/mpc824x/drivers/i2c/Makefile +++ /dev/null @@ -1,84 +0,0 @@ -########################################################################## -# -# Copyright Motorola, Inc. 1997 -# ALL RIGHTS RESERVED -# -# You are hereby granted a copyright license to use, modify, and -# distribute the SOFTWARE so long as this entire notice is retained -# without alteration in any modified and/or redistributed versions, -# and that such modified versions are clearly identified as such. -# No licenses are granted by implication, estoppel or otherwise under -# any patents or trademarks of Motorola, Inc. -# -# The SOFTWARE is provided on an "AS IS" basis and without warranty. -# To the maximum extent permitted by applicable law, MOTOROLA DISCLAIMS -# ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, INCLUDING IMPLIED -# WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR -# PURPOSE AND ANY WARRANTY AGAINST INFRINGEMENT WITH -# REGARD TO THE SOFTWARE (INCLUDING ANY MODIFIED VERSIONS -# THEREOF) AND ANY ACCOMPANYING WRITTEN MATERIALS. -# -# To the maximum extent permitted by applicable law, IN NO EVENT SHALL -# MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER -# (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF -# BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS -# INFORMATION, OR OTHER PECUNIARY LOSS) ARISING OF THE USE OR -# INABILITY TO USE THE SOFTWARE. -# -############################################################################ -TARGET = libi2c.a - -#DEBUG = -g -DEBUG = -DI2CDBG -LST = -Hanno -S -OPTIM = -CC = /risc/tools/pkgs/metaware/bin/hcppc -CFLAGS = -Hnocopyr -c -Hsds -Hon=Char_default_unsigned -Hon=Char_is_rep -I../inc -I/risc/tools/pkgs/metaware/inc -CCobj = $(CC) $(CFLAGS) $(DEBUG) $(OPTIM) -PREP = $(CC) $(CFLAGS) -P - -# Assembler used to build the .s files (for the board version) - -ASOPT = -big_si -c -ASDEBUG = -l -fm -AS = /risc/tools/pkgs/metaware/bin/asppc - -# Linker to bring .o files together into an executable. - -LKOPT = -Bbase=0 -q -Qn -r -LKCMD = -LINK = /risc/tools/pkgs/metaware/bin/ldppc $(LKCMD) $(LKOPT) - -# DOS Utilities - -DEL = rm -COPY = cp -LIST = ls - -OBJECTS = i2c1.o i2c2.o - -all: $(TARGET) - -objects: $(OBJECTS) - -$(TARGET): $(OBJECTS) - $(LINK) $(OBJECTS) -o $@ - -clean: - $(DEL) -f *.o *.i *.map *.lst $(TARGET) $(OBJECTS) - -.s.o: - $(DEL) -f $*.i - $(PREP) -Hasmcpp $< - $(AS) $(ASOPT) $*.i -# $(AS) $(ASOPT) $(ASDEBUG) $*.i > $*.lst - -.c.o: - $(CCobj) $< - -.c.s: - $(CCobj) $(LST) $< - -i2c1.o: i2c_export.h i2c.h i2c1.c - -i2c2.o: i2c.h i2c2.s diff --git a/cpu/mpc824x/drivers/i2c/Makefile_pc b/cpu/mpc824x/drivers/i2c/Makefile_pc deleted file mode 100644 index 4d42c7b8487..00000000000 --- a/cpu/mpc824x/drivers/i2c/Makefile_pc +++ /dev/null @@ -1,91 +0,0 @@ -########################################################################## -# -# makefile_pc for use with PC mksnt tools dink32/drivers/i2c -# -# Copyright Motorola, Inc. 1997 -# ALL RIGHTS RESERVED -# -# You are hereby granted a copyright license to use, modify, and -# distribute the SOFTWARE so long as this entire notice is retained -# without alteration in any modified and/or redistributed versions, -# and that such modified versions are clearly identified as such. -# No licenses are granted by implication, estoppel or otherwise under -# any patents or trademarks of Motorola, Inc. -# -# The SOFTWARE is provided on an "AS IS" basis and without warranty. -# To the maximum extent permitted by applicable law, MOTOROLA DISCLAIMS -# ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, INCLUDING IMPLIED -# WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR -# PURPOSE AND ANY WARRANTY AGAINST INFRINGEMENT WITH -# REGARD TO THE SOFTWARE (INCLUDING ANY MODIFIED VERSIONS -# THEREOF) AND ANY ACCOMPANYING WRITTEN MATERIALS. -# -# To the maximum extent permitted by applicable law, IN NO EVENT SHALL -# MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER -# (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF -# BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS -# INFORMATION, OR OTHER PECUNIARY LOSS) ARISING OF THE USE OR -# INABILITY TO USE THE SOFTWARE. -# -############################################################################ -TARGET = libi2c.a - -#DEBUG = -g -DEBUG = -DI2CDBG -LST = -Hanno -S -OPTIM = -CC = m:/old_tools/tools/hcppc/bin/hcppc -CFLAGS = -Hnocopyr -c -Hsds -Hon=Char_default_unsigned -Hon=Char_is_rep -I../inc -I/risc/tools/pkgs/metaware/inc -CCobj = $(CC) $(CFLAGS) $(DEBUG) $(OPTIM) -PREP = $(CC) $(CFLAGS) -P - -# Assembler used to build the .s files (for the board version) - -ASOPT = -big_si -c -ASDEBUG = -l -fm -AS = m:/old_tools/tools/hcppc/bin/asppc - -# Linker to bring .o files together into an executable. - -LKOPT = -Bbase=0 -q -Qn -r -LKCMD = -LINK = m:/old_tools/tools/hcppc/bin/ldppc $(LKCMD) $(LKOPT) - -# DOS Utilities - -DEL = rm -COPY = cp -LIST = ls - -OBJECTS = i2c1.o i2c2.o - -all: $(TARGET) - -objects: $(OBJECTS) - -$(TARGET): $(OBJECTS) - $(LINK) $(OBJECTS) -o $@ - -clean: - $(DEL) -f *.o *.i *.map *.lst $(TARGET) $(OBJECTS) - -.s.o: - $(DEL) -f $*.i - $(PREP) -Hasmcpp $< - $(AS) $(ASOPT) $*.i -# $(AS) $(ASOPT) $(ASDEBUG) $*.i > $*.lst - -.c.o: - $(CCobj) $< - -.c.s: - $(CCobj) $(LST) $< - -i2c1.o: i2c_export.h i2c.h i2c1.c - $(CCobj) $< - - -i2c2.o: i2c.h i2c2.s - $(DEL) -f $*.i - $(PREP) -Hasmcpp $< - $(AS) $(ASOPT) $*.i diff --git a/cpu/mpc824x/drivers/i2c/README b/cpu/mpc824x/drivers/i2c/README deleted file mode 100644 index 1db72108cac..00000000000 --- a/cpu/mpc824x/drivers/i2c/README +++ /dev/null @@ -1,104 +0,0 @@ -CONTENT: - - i2c.h - i2c1.c - i2c2.s - -WHAT ARE THESE FILES: - -These files contain MPC8240 (Kahlua) I2C -driver routines. The driver routines are not -written for any specific operating system. -They serves the purpose of code sample, and -jump-start for using the MPC8240 I2C unit. - -For the reason of correctness of C language -syntax, these files are compiled by Metaware -C compiler and assembler. - -ENDIAN NOTATION: - -The algorithm is designed for big-endian mode, -software is responsible for byte swapping. - -USAGE: - -1. The host system that is running on MPC8240 - shall link the files listed here. The memory - location of driver routines shall take into - account of that driver routines need to run - in supervisor mode and they process I2C - interrupt. - -2. The host system is responsible for configuring - the MPC8240 including Embedded Utilities Memory - Block. All I2C driver functions require the - content of Embedded Utilities Memory Block - Base Address Register, EUMBBAR, as the first - parameter. - -3. Before I2C unit of MPC8240 can be used, - initialize I2C unit by calling I2C_Init - with the corresponding parameters. - - Note that the I2CFDR register shall be written - once during the initialization. If it is written - in the midst of transers, or after I2C STOPs or - REPEAT STATRs, depending on the data written, - a long reset time may be encountered. - -4. After I2C unit has been successfully initialized, - use the Application level API to send data or - receive data upon the desired mode, Master or - Slave. - -5. If the host system is also using the EPIC unit - on MPC8240, the system can register the - I2C_ISR with the EPIC including other - desired resources. - - If the host system does not using the EPIC unit - on MPC8240, I2C_Timer_Event function can - be called for each desired time interval. - - In both cases, the host system is free to provide - its own timer event handler and interrupt service - routine. - -6. The I2C driver routines contains a set - of utilities, Set and Get, for host system - to query and modify the desired I2C registers. - -7. It is the host system's responsibility of - queueing the I2C I/O request. The host - system shall check the I2C_ISR return code - for I2C I/O status. If I2C_ISR returns - I2CBUFFEMPTY or I2CBUFFFULL, it means - I2C unit has completed a I/O request - stated by the Application API. - -8. If the host system has more than one master - mode I2C unit I/O requests but doesn't want - to be intervented by being addressed as slave, - the host system can use the master mode - Application API with stop_flag set to 0 in - conjunction with is_cnt flag set to 1. - The first API call sets both stop_flag and - is_cnt to 0, indicating a START condition - shall be generated but when the end of - transaction is reached, do not generate a - STOP condition. Once the host system is - informed that the transaction has been - completed, the next Application API call - shall set is_cnt flag to 1, indicating a - repeated START condition shall be generated. - The last Application API call shall set - stop_flag - to 1. - -9. The I2C_Timer_Event function containes - a user defined function pointer. It - serves the purpose of providing the - host system a way to use its own event - handler instead of the I2C_ISR provided - here. diff --git a/cpu/mpc824x/drivers/i2c/i2c.c b/cpu/mpc824x/drivers/i2c/i2c.c new file mode 100644 index 00000000000..7445a1ce314 --- /dev/null +++ b/cpu/mpc824x/drivers/i2c/i2c.c @@ -0,0 +1,284 @@ +/* + * (C) Copyright 2003 + * Gleb Natapov <gnatapov@mrv.com> + * Some bits are taken from linux driver writen by adrian@humboldt.co.uk + * + * Hardware I2C driver for MPC107 PCI bridge. + * + * 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 + */ + +#include <common.h> + +#undef I2CDBG + +#ifdef CONFIG_HARD_I2C +#include <i2c.h> + +#define TIMEOUT (CFG_HZ/4) + +#define I2C_Addr ((unsigned *)(CFG_EUMB_ADDR + 0x3000)) + +#define I2CADR &I2C_Addr[0] +#define I2CFDR &I2C_Addr[1] +#define I2CCCR &I2C_Addr[2] +#define I2CCSR &I2C_Addr[3] +#define I2CCDR &I2C_Addr[4] + +#define MPC107_CCR_MEN 0x80 +#define MPC107_CCR_MIEN 0x40 +#define MPC107_CCR_MSTA 0x20 +#define MPC107_CCR_MTX 0x10 +#define MPC107_CCR_TXAK 0x08 +#define MPC107_CCR_RSTA 0x04 + +#define MPC107_CSR_MCF 0x80 +#define MPC107_CSR_MAAS 0x40 +#define MPC107_CSR_MBB 0x20 +#define MPC107_CSR_MAL 0x10 +#define MPC107_CSR_SRW 0x04 +#define MPC107_CSR_MIF 0x02 +#define MPC107_CSR_RXAK 0x01 + +#define I2C_READ 1 +#define I2C_WRITE 0 + +/* taken from linux include/asm-ppc/io.h */ +inline unsigned in_le32 (volatile unsigned *addr) +{ + unsigned ret; + + __asm__ __volatile__ ("lwbrx %0,0,%1;\n" + "twi 0,%0,0;\n" + "isync":"=r" (ret): "r" (addr), "m" (*addr)); + return ret; +} + +inline void out_le32 (volatile unsigned *addr, int val) +{ + __asm__ __volatile__ ("stwbrx %1,0,%2; eieio":"=m" (*addr):"r" (val), + "r" (addr)); +} + +#define writel(val, addr) out_le32(addr, val) +#define readl(addr) in_le32(addr) + +void i2c_init (int speed, int slaveadd) +{ + /* stop I2C controller */ + writel (0x0, I2CCCR); + /* set clock */ + writel (0x1020, I2CFDR); + /* write slave address */ + writel (slaveadd, I2CADR); + /* clear status register */ + writel (0x0, I2CCSR); + /* start I2C controller */ + writel (MPC107_CCR_MEN, I2CCCR); + + return; +} + +static __inline__ int i2c_wait4bus (void) +{ + ulong timeval = get_timer (0); + + while (readl (I2CCSR) & MPC107_CSR_MBB) + if (get_timer (timeval) > TIMEOUT) + return -1; + + return 0; +} + +static __inline__ int i2c_wait (int write) +{ + u32 csr; + ulong timeval = get_timer (0); + + do { + csr = readl (I2CCSR); + + if (!(csr & MPC107_CSR_MIF)) + continue; + + writel (0x0, I2CCSR); + + if (csr & MPC107_CSR_MAL) { +#ifdef I2CDBG + printf ("i2c_wait: MAL\n"); +#endif + return -1; + } + + if (!(csr & MPC107_CSR_MCF)) { +#ifdef I2CDBG + printf ("i2c_wait: unfinished\n"); +#endif + return -1; + } + + if (write == I2C_WRITE && (csr & MPC107_CSR_RXAK)) { +#ifdef I2CDBG + printf ("i2c_wait: No RXACK\n"); +#endif + return -1; + } + + return 0; + } while (get_timer (timeval) < TIMEOUT); + +#ifdef I2CDBG + printf ("i2c_wait: timed out\n"); +#endif + return -1; +} + +static __inline__ int i2c_write_addr (u8 dev, u8 dir, int rsta) +{ + writel (MPC107_CCR_MEN | MPC107_CCR_MSTA | MPC107_CCR_MTX | + (rsta ? MPC107_CCR_RSTA : 0), I2CCCR); + + writel ((dev << 1) | dir, I2CCDR); + + if (i2c_wait (I2C_WRITE) < 0) + return 0; + + return 1; +} + +static __inline__ int __i2c_write (u8 * data, int length) +{ + int i; + + writel (MPC107_CCR_MEN | MPC107_CCR_MSTA | MPC107_CCR_MTX, I2CCCR); + + for (i = 0; i < length; i++) { + writel (data[i], I2CCDR); + + if (i2c_wait (I2C_WRITE) < 0) + break; + } + + return i; +} + +static __inline__ int __i2c_read (u8 * data, int length) +{ + int i; + + writel (MPC107_CCR_MEN | MPC107_CCR_MSTA | + ((length == 1) ? MPC107_CCR_TXAK : 0), I2CCCR); + + /* dummy read */ + readl (I2CCDR); + + for (i = 0; i < length; i++) { + if (i2c_wait (I2C_READ) < 0) + break; + + /* Generate ack on last next to last byte */ + if (i == length - 2) + writel (MPC107_CCR_MEN | MPC107_CCR_MSTA | + MPC107_CCR_TXAK, I2CCCR); + + /* Generate stop on last byte */ + if (i == length - 1) + writel (MPC107_CCR_MEN | MPC107_CCR_TXAK, I2CCCR); + + data[i] = readl (I2CCDR); + } + + return i; +} + +int i2c_read (u8 dev, uint addr, int alen, u8 * data, int length) +{ + int i = 0; + u8 *a = (u8 *) & addr; + + if (i2c_wait4bus () < 0) + goto exit; + + if (i2c_write_addr (dev, I2C_WRITE, 0) == 0) + goto exit; + + if (__i2c_write (&a[4 - alen], alen) != alen) + goto exit; + + if (i2c_write_addr (dev, I2C_READ, 1) == 0) + goto exit; + + i = __i2c_read (data, length); + +exit: + writel (MPC107_CCR_MEN, I2CCCR); + + return !(i == length); +} + +int i2c_write (u8 dev, uint addr, int alen, u8 * data, int length) +{ + int i = 0; + u8 *a = (u8 *) & addr; + + if (i2c_wait4bus () < 0) + goto exit; + + if (i2c_write_addr (dev, I2C_WRITE, 0) == 0) + goto exit; + + if (__i2c_write (&a[4 - alen], alen) != alen) + goto exit; + + i = __i2c_write (data, length); + +exit: + writel (MPC107_CCR_MEN, I2CCCR); + + return !(i == length); +} + +int i2c_probe (uchar chip) +{ + int tmp; + + /* + * Try to read the first location of the chip. The underlying + * driver doesn't appear to support sending just the chip address + * and looking for an <ACK> back. + */ + udelay (10000); + return i2c_read (chip, 0, 1, (char *) &tmp, 1); +} + +uchar i2c_reg_read (uchar i2c_addr, uchar reg) +{ + char buf[1]; + + i2c_read (i2c_addr, reg, 1, buf, 1); + + return (buf[0]); +} + +void i2c_reg_write (uchar i2c_addr, uchar reg, uchar val) +{ + i2c_write (i2c_addr, reg, 1, &val, 1); +} + +#endif /* CONFIG_HARD_I2C */ diff --git a/cpu/mpc824x/drivers/i2c/i2c.h b/cpu/mpc824x/drivers/i2c/i2c.h deleted file mode 100644 index 48a401d9076..00000000000 --- a/cpu/mpc824x/drivers/i2c/i2c.h +++ /dev/null @@ -1,309 +0,0 @@ -#ifndef I2C_H -#define I2C_H - -/**************************************************** - * - * Copyright Motrola 1999 - * - ****************************************************/ -#define get_eumbbar() CFG_EUMB_ADDR - -#define I2CADR 0x00003000 -#define I2CFDR 0x00003004 -#define I2CCR 0x00003008 -#define I2CSR 0x0000300C -#define I2CDR 0x00003010 - -typedef enum _i2cstatus -{ - I2CSUCCESS = 0x3000, - I2CADDRESS, - I2CERROR, - I2CBUFFFULL, - I2CBUFFEMPTY, - I2CXMITERROR, - I2CRCVERROR, - I2CBUSBUSY, - I2CALOSS, - I2CNOEVENT, -} I2CStatus; - -typedef enum i2c_control -{ - MEN = 0x00000080, - MIEN = 0x00000040, - MSTA = 0x00000020, - MTX = 0x00000010, - TXAK = 0x00000008, - RSTA = 0x00000004, -} I2C_CONTROL; - -typedef enum i2c_status -{ - MCF = 0x00000080, - MAAS = 0x00000040, - MBB = 0x00000020, - MAL = 0x00000010, - SRW = 0x00000004, - MIF = 0x00000002, - RXAK = 0x00000001, -} I2C_STATUS; - -typedef struct _i2c_ctrl -{ - unsigned int reserved0 : 24; - unsigned int men : 1; - unsigned int mien : 1; - unsigned int msta : 1; - unsigned int mtx : 1; - unsigned int txak : 1; - unsigned int rsta : 1; - unsigned int reserved1 : 2; -} I2C_CTRL; - -typedef struct _i2c_stat -{ - unsigned int rsrv0 : 24; - unsigned int mcf : 1; - unsigned int maas : 1; - unsigned int mbb : 1; - unsigned int mal : 1; - unsigned int rsrv1 : 1; - unsigned int srw : 1; - unsigned int mif : 1; - unsigned int rxak : 1; -} I2C_STAT; - -typedef enum _i2c_mode -{ - RCV = 0, - XMIT = 1, -} I2C_MODE; - -/******************** App. API ******************** - * The application API is for user level application - * to use the funcitonality provided by I2C driver - * - * Note: Its App.s responsibility to swap the data - * byte. In our API, we just transfer whatever - * we are given - **************************************************/ -/** - * Note: - * - * In all following functions, - * the caller shall pass the configured embedded utility memory - * block base, EUMBBAR. - **/ - -/* Send a buffer of data to the intended rcv_addr. - * If stop_flag is set, after the whole buffer - * is sent, generate a STOP signal provided that the - * receiver doesn't signal the STOP in the middle. - * I2C is the master performing transmitting. If - * no STOP signal is generated at the end of current - * transaction, the master can generate a START signal - * to another slave addr. - * - * return I2CSUCCESS if no error. - */ -static I2CStatus I2C_put( unsigned int eumbbar, - unsigned char rcv_addr, /* receiver's address */ - unsigned char *buffer_ptr, /* pointer of data to be sent */ - unsigned int length, /* number of byte of in the buffer */ - unsigned int stop_flag, /* 1 - signal STOP when buffer is empty - * 0 - no STOP signal when buffer is empty - */ - unsigned int is_cnt ); /* 1 - this is a restart, don't check MBB - * 0 - this is a new start, check MBB - */ - -/* Receive a buffer of data from the desired sender_addr - * If stop_flag is set, when the buffer is full and the - * sender does not signal STOP, generate a STOP signal. - * I2C is the master performing receiving. If no STOP signal - * is generated, the master can generate a START signal - * to another slave addr. - * - * return I2CSUCCESS if no error. - */ -static I2CStatus I2C_get( unsigned int eumbbar, - unsigned char sender_addr, /* sender's address */ - unsigned char *buffer_ptr, /* pointer of receiving buffer */ - unsigned int length, /* length of the receiving buffer */ - unsigned int stop_flag, /* 1 - signal STOP when buffer is full - * 0 - no STOP signal when buffer is full - */ - unsigned int is_cnt ); /* 1 - this is a restart, don't check MBB - * 0 - this is a new start, check MBB - */ - -#if 0 /* the I2C_write and I2C_read functions are not active */ -/* Send a buffer of data to the requiring master. - * If stop_flag is set, after the whole buffer is sent, - * generate a STOP signal provided that the requiring - * receiver doesn't signal the STOP in the middle. - * I2C is the slave performing transmitting. - * - * return I2CSUCCESS if no error. - * - * Note: due to the Kahlua design, slave transmitter - * shall not signal STOP since there is no way - * for master to detect it, causing I2C bus hung. - * - * For the above reason, the stop_flag is always - * set, i.e., 1. - * - * programmer shall use the timer on Kahlua to - * control the interval of data byte at the - * master side. - */ -static I2CStatus I2C_write( unsigned int eumbbar, - unsigned char *buffer_ptr, /* pointer of data to be sent */ - unsigned int length, /* number of byte of in the buffer */ - unsigned int stop_flag ); /* 1 - signal STOP when buffer is empty - * 0 - no STOP signal when buffer is empty - */ - - /* Receive a buffer of data from the sending master. - * If stop_flag is set, when the buffer is full and the - * sender does not signal STOP, generate a STOP signal. - * I2C is the slave performing receiving. - * - * return I2CSUCCESS if no error. - */ -static I2CStatus I2C_read(unsigned int eumbbar, - unsigned char *buffer_ptr, /* pointer of receiving buffer */ - unsigned int length, /* length of the receiving buffer */ - unsigned int stop_flag ); /* 1 - signal STOP when buffer is full - * 0 - no STOP signal when buffer is full - */ -#endif /* of if0 for turning off I2C_read & I2C_write */ - -/* if interrupt is not used, this is the timer event handler. - * After each fixed time interval, this function can be called - * to check the I2C status and call appropriate function to - * handle the status event. - */ -static I2CStatus I2C_Timer_Event( unsigned int eumbbar, I2CStatus (*handler)( unsigned int ) ); - -/********************* Kernel API ************************ - * Kernel APIs are functions I2C driver provides to the - * O.S. - *********************************************************/ - -/******************* device I/O function ***************/ - -/* Generate a START signal in the desired mode. - * I2C is the master. - * - * return I2CSUCCESS if no error. - * I2CERROR if i2c unit is not enabled. - * I2CBUSBUSY if bus cannot be granted - */ -static I2CStatus I2C_Start( unsigned int eumbbar, - unsigned char slave_addr, /* address of the receiver */ - I2C_MODE mode, /* XMIT(1) - put (write) - * RCV(0) - get (read) - */ - unsigned int is_cnt ); /* 1 - this is a restart, don't check MBB - * 0 - this is a new start, check MBB - */ - -/* Generate a STOP signal to terminate the transaction. */ -static I2CStatus I2C_Stop( unsigned int eumbbar ); - -/* Do a one-byte master transmit. - * - * return I2CBUFFEMPTY if this is the last byte. - * Otherwise return I2CSUCCESS - */ -static I2CStatus I2C_Master_Xmit( unsigned int eumbbar ); - -/* Do a one-byte master receive. - * - * return I2CBUFFFULL if this is the last byte. - * Otherwise return I2CSUCCESS - */ -static I2CStatus I2C_Master_Rcv( unsigned int eumbbar ); - -/* Do a one-byte slave transmit. - * - * return I2CBUFFEMPTY if this is the last byte. - * Otherwise return I2CSUCCESS - * - */ -static I2CStatus I2C_Slave_Xmit( unsigned int eumbbar ); - -/* Do a one-byte slave receive. - * - * return I2CBUFFFULL if this is the last byte. - * Otherwise return I2CSUCCESS - */ -static I2CStatus I2C_Slave_Rcv( unsigned int eumbbar ); - -/* Process slave address phase. - * - * return I2CADDRESS if this is slave receiver's address phase - * Otherwise return the result of slave xmit one byte. - */ -static I2CStatus I2C_Slave_Addr( unsigned int eumbbar ); - -/******************* Device Control Fucntion ****************/ -/* Initialize I2C unit with desired frequency divider, - * driver's slave address w/o interrupt enabled. - * - * This function must be called before I2C unit can - * be used. - */ -static I2CStatus I2C_Init( unsigned int eumbbar, - unsigned char fdr, /* frequency divider */ - unsigned char addr, /* driver's address used for receiving */ - unsigned int en_int); /* 1 - enable I2C interrupt - * 0 - disable I2C interrup - */ - -/* I2C interrupt service routine. - * - * return I2CADDRESS if it is receiver's (either master or slave) address phase. - * return the result of xmit or receive one byte - */ -static I2CStatus I2C_ISR(unsigned int eumbbar ); - -/* Set I2C Status, i.e., write to I2CSR */ -static void I2C_Set_Stat( unsigned int eumbbar, I2C_STAT stat ); - -/* Query I2C Status, i.e., read I2CSR */ -static I2C_STAT I2C_Get_Stat( unsigned int eumbbar ); - -/* Change I2C Control bits, i.e., write to I2CCR */ -static void I2C_Set_Ctrl( unsigned int eumbbar, I2C_CTRL ); /* new control value */ - -/* Query I2C Control bits, i.e., read I2CCR */ -static I2C_CTRL I2C_Get_Ctrl( unsigned int eumbbar ); - -/* This function performs the work for I2C_do_transaction. The work is - * split into this function to enable I2C_do_transaction to first transmit - * the data address to the I2C slave device without putting the data address - * into the first byte of the buffer. - * - * en_int controls interrupt/polling mode - * act is the type of transaction - * i2c_addr is the I2C address of the slave device - * len is the length of data to send or receive - * buffer is the address of the data buffer - * stop = I2C_NO_STOP, don't signal STOP at end of transaction - * I2C_STOP, signal STOP at end of transaction - * retry is the timeout retry value, currently ignored - * rsta = I2C_NO_RESTART, this is not continuation of existing transaction - * I2C_RESTART, this is a continuation of existing transaction - */ -static I2C_Status I2C_do_buffer( I2C_INTERRUPT_MODE en_int, - I2C_TRANSACTION_MODE act, - unsigned char i2c_addr, - int len, - unsigned char *buffer, - I2C_STOP_MODE stop, - int retry, - I2C_RESTART_MODE rsta); -#endif diff --git a/cpu/mpc824x/drivers/i2c/i2c1.c b/cpu/mpc824x/drivers/i2c/i2c1.c deleted file mode 100644 index 94c671e5672..00000000000 --- a/cpu/mpc824x/drivers/i2c/i2c1.c +++ /dev/null @@ -1,1243 +0,0 @@ -/************************************************************* - * - * Copyright @ Motorola, 1999 - * - ************************************************************/ -#include <common.h> - -#ifdef CONFIG_HARD_I2C -#include <i2c.h> -#include "i2c_export.h" -#include "i2c.h" - -#undef I2CDBG0 -#undef DEBUG - -/* Define a macro to use an optional application-layer print function, if - * one was passed to the I2C library during initialization. If there was - * no function pointer passed, this protects against calling it. Also define - * the global variable that holds the passed pointer. - */ -#define TIMEOUT (CFG_HZ/4) -#define PRINT if ( app_print ) app_print -static int (*app_print) (char *, ...); - -/******************* Internal to I2C Driver *****************/ -static unsigned int ByteToXmit = 0; -static unsigned int XmitByte = 0; -static unsigned char *XmitBuf = 0; -static unsigned int XmitBufEmptyStop = 0; -static unsigned int ByteToRcv = 0; -static unsigned int RcvByte = 0; -static unsigned char *RcvBuf = 0; -static unsigned int RcvBufFulStop = 0; -static unsigned int MasterRcvAddress = 0; - -/* Set by call to get_eumbbar during I2C_Initialize. - * This could be globally available to the I2C library, but there is - * an advantage to passing it as a parameter: it is already in a register - * and doesn't have to be loaded from memory. Also, that is the way the - * I2C library was already implemented and I don't want to change it without - * a more detailed analysis. - * It is being set as a global variable in I2C_Initialize to hide it from - * the DINK application layer, because it is Kahlua-specific. I think that - * get_eumbbar, load_runtime_reg, and store_runtime_reg should be defined in - * a Kahlua-specific library dealing with the embedded utilities memory block. - * Right now, get_eumbbar is defined in dink32/kahlua.s. The other two are - * defined in dink32/drivers/i2c/i2c2.s. - */ -static unsigned int Global_eumbbar = 0; - -extern unsigned int load_runtime_reg (unsigned int eumbbar, - unsigned int reg); - -extern unsigned int store_runtime_reg (unsigned int eumbbar, - unsigned int reg, unsigned int val); - -/************************** API *****************/ - -/* Application Program Interface (API) are the calls provided by the I2C - * library to upper layer applications (i.e., DINK) to access the Kahlua - * I2C bus interface. The functions and values that are part of this API - * are declared in i2c_export.h. - */ - -/* Initialize I2C unit with the following: - * driver's slave address - * interrupt enabled - * optional pointer to application layer print function - * - * These parameters may be added: - * desired clock rate - * digital filter frequency sampling rate - * - * This function must be called before I2C unit can be used. - */ -I2C_Status I2C_Initialize (unsigned char addr, - I2C_INTERRUPT_MODE en_int, - int (*p) (char *, ...)) -{ - I2CStatus status; - - /* establish the pointer, if there is one, to the application's "printf" */ - app_print = p; - - /* If this is the first call, get the embedded utilities memory block - * base address. I'm not sure what to do about error handling here: - * if a non-zero value is returned, accept it. - */ - if (Global_eumbbar == 0) - Global_eumbbar = get_eumbbar (); - if (Global_eumbbar == 0) { - PRINT ("I2C_Initialize: can't find EUMBBAR\n"); - return I2C_ERROR; - } - - /* validate the I2C address */ - if (addr & 0x80) { - PRINT ("I2C_Initialize, I2C address invalid: %d 0x%x\n", - (unsigned int) addr, (unsigned int) addr); - return I2C_ERROR; - } - - /* Call the internal I2C library function to perform work. - * Accept the default frequency sampling rate (no way to set it currently, - * via I2C_Init) and set the clock frequency to something reasonable. - */ - status = I2C_Init (Global_eumbbar, (unsigned char) 0x31, addr, en_int); - if (status != I2CSUCCESS) { - PRINT ("I2C_Initialize: error in initiation\n"); - return I2C_ERROR; - } - - /* all is well */ - return I2C_SUCCESS; -} - - -/* Perform the given I2C transaction, only MASTER_XMIT and MASTER_RCV - * are implemented. Both are only in polling mode. - * - * en_int controls interrupt/polling mode - * act is the type of transaction - * i2c_addr is the I2C address of the slave device - * data_addr is the address of the data on the slave device - * len is the length of data to send or receive - * buffer is the address of the data buffer - * stop = I2C_NO_STOP, don't signal STOP at end of transaction - * I2C_STOP, signal STOP at end of transaction - * retry is the timeout retry value, currently ignored - * rsta = I2C_NO_RESTART, this is not continuation of existing transaction - * I2C_RESTART, this is a continuation of existing transaction - */ -I2C_Status I2C_do_transaction ( I2C_INTERRUPT_MODE en_int, - I2C_TRANSACTION_MODE act, - unsigned char i2c_addr, - unsigned char data_addr, - int len, - char *buffer, - I2C_STOP_MODE stop, - int retry, I2C_RESTART_MODE rsta) -{ - I2C_Status status; - unsigned char data_addr_buffer[1]; - -#if 1 -/* This is a temporary work-around. The I2C library breaks the protocol - * if it attempts to handle a data transmission in more than one - * transaction, so the data address and the actual data bytes are put - * into a single buffer before sending it to the library internal functions. - * The problem is related to being able to restart a transaction without - * sending the I2C device address or repeating the data address. It may take - * a day or two to sort it all out, so I'll have to get back to it later. - * Look at I2C_Start to see about using some status flags (I'm not sure that - * "stop" and "rsta" are enough to reflect the states, maybe so; but the logic - * in the library is insufficient) to control correct handling of the protocol. - */ - unsigned char dummy_buffer[257]; - - if (act == I2C_MASTER_XMIT) { - int i; - - if (len > 256) - return I2C_ERROR; - for (i = 1; i <= len; i++) - dummy_buffer[i] = buffer[i - 1]; - dummy_buffer[0] = data_addr; - status = I2C_do_buffer (en_int, act, i2c_addr, 1 + len, - dummy_buffer, stop, retry, rsta); - if (status != I2C_SUCCESS) { - PRINT ("I2C_do_transaction: can't perform data transfer\n"); - return I2C_ERROR; - } - return I2C_SUCCESS; - } -#endif /* end of temp work-around */ - - /* validate requested transaction type */ - if ((act != I2C_MASTER_XMIT) && (act != I2C_MASTER_RCV)) { - PRINT ("I2C_do_transaction, invalid transaction request: %d\n", - act); - return I2C_ERROR; - } - - /* range check the I2C address */ - if (i2c_addr & 0x80) { - PRINT ("I2C_do_transaction, I2C address out of range: %d 0x%x\n", - (unsigned int) i2c_addr, (unsigned int) i2c_addr); - return I2C_ERROR; - } else { - data_addr_buffer[0] = data_addr; - } - - /* - * We first have to contact the slave device and transmit the - * data address. Be careful about the STOP and restart stuff. - * We don't want to signal STOP after sending the data - * address, but this could be a continuation if the - * application didn't release the bus after the previous - * transaction, by not sending a STOP after it. - */ - status = I2C_do_buffer (en_int, I2C_MASTER_XMIT, i2c_addr, 1, - data_addr_buffer, I2C_NO_STOP, retry, rsta); - if (status != I2C_SUCCESS) { - PRINT ("I2C_do_transaction: can't send data address for read\n"); - return I2C_ERROR; - } - - /* The data transfer will be a continuation. */ - rsta = I2C_RESTART; - - /* now handle the user data */ - status = I2C_do_buffer (en_int, act, i2c_addr, len, - buffer, stop, retry, rsta); - if (status != I2C_SUCCESS) { - PRINT ("I2C_do_transaction: can't perform data transfer\n"); - return I2C_ERROR; - } - - /* all is well */ - return I2C_SUCCESS; -} - -/* This function performs the work for I2C_do_transaction. The work is - * split into this function to enable I2C_do_transaction to first transmit - * the data address to the I2C slave device without putting the data address - * into the first byte of the buffer. - * - * en_int controls interrupt/polling mode - * act is the type of transaction - * i2c_addr is the I2C address of the slave device - * len is the length of data to send or receive - * buffer is the address of the data buffer - * stop = I2C_NO_STOP, don't signal STOP at end of transaction - * I2C_STOP, signal STOP at end of transaction - * retry is the timeout retry value, currently ignored - * rsta = I2C_NO_RESTART, this is not continuation of existing transaction - * I2C_RESTART, this is a continuation of existing transaction - */ -static I2C_Status I2C_do_buffer (I2C_INTERRUPT_MODE en_int, - I2C_TRANSACTION_MODE act, - unsigned char i2c_addr, - int len, - unsigned char *buffer, - I2C_STOP_MODE stop, - int retry, I2C_RESTART_MODE rsta) -{ - I2CStatus rval; - unsigned int dev_stat; - - if (act == I2C_MASTER_RCV) { - /* set up for master-receive transaction */ - rval = I2C_get (Global_eumbbar, i2c_addr, buffer, len, stop, rsta); - } else { - /* set up for master-transmit transaction */ - rval = I2C_put (Global_eumbbar, i2c_addr, buffer, len, stop, rsta); - } - - /* validate the setup */ - if (rval != I2CSUCCESS) { - dev_stat = load_runtime_reg (Global_eumbbar, I2CSR); - PRINT ("Error(I2C_do_buffer): control phase, code(0x%08x), status(0x%08x)\n", rval, dev_stat); - I2C_Stop (Global_eumbbar); - return I2C_ERROR; - } - - if (en_int == 1) { - /* this should not happen, no interrupt handling yet */ - return I2C_SUCCESS; - } - - /* this performs the polling action, when the transfer is completed, - * the status returned from I2C_Timer_Event will be I2CBUFFFULL or - * I2CBUFFEMPTY (rcv or xmit), I2CSUCCESS or I2CADDRESS indicates the - * transaction is not yet complete, anything else is an error. - */ - while (rval == I2CSUCCESS || rval == I2CADDRESS) { - int timeval = get_timer (0); - - /* poll the device until something happens */ - do { - rval = I2C_Timer_Event (Global_eumbbar, 0); - } - while (rval == I2CNOEVENT && get_timer (timeval) < TIMEOUT); - - /* check for error condition */ - if (rval == I2CSUCCESS || - rval == I2CBUFFFULL || - rval == I2CBUFFEMPTY || - rval == I2CADDRESS) { - ; /* do nothing */ - } else { - /* report the error condition */ - dev_stat = load_runtime_reg (Global_eumbbar, I2CSR); - PRINT ("Error(I2C_do_buffer): code(0x%08x), status(0x%08x)\n", - rval, dev_stat); - return I2C_ERROR; - } - } - - /* all is well */ - return I2C_SUCCESS; -} - -/** - * Note: - * - * In all following functions, - * the caller shall pass the configured embedded utility memory - * block base, EUMBBAR. - **/ - -/*********************************************************** - * function: I2C_put - * - * description: - Send a buffer of data to the intended rcv_addr. - * If stop_flag is set, after the whole buffer - * is sent, generate a STOP signal provided that the - * receiver doesn't signal the STOP in the middle. - * I2C is the master performing transmitting. If - * no STOP signal is generated at the end of current - * transaction, the master can generate a START signal - * to another slave addr. - * - * note: this is master xmit API - *********************************************************/ -static I2CStatus I2C_put (unsigned int eumbbar, unsigned char rcv_addr, /* receiver's address */ - unsigned char *buffer_ptr, /* pointer of data to be sent */ - unsigned int length, /* number of byte of in the buffer */ - unsigned int stop_flag, /* 1 - signal STOP when buffer is empty - * 0 - no STOP signal when buffer is empty - */ - unsigned int is_cnt) -{ /* 1 - this is a restart, don't check MBB - * 0 - this is a new start, check MBB - */ - if (buffer_ptr == 0 || length == 0) { - return I2CERROR; - } -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_put\n", __FILE__, __LINE__); -#endif - - XmitByte = 0; - ByteToXmit = length; - XmitBuf = buffer_ptr; - XmitBufEmptyStop = stop_flag; - - RcvByte = 0; - ByteToRcv = 0; - RcvBuf = 0; - - /* we are the master, start transaction */ - return I2C_Start (eumbbar, rcv_addr, XMIT, is_cnt); -} - -/*********************************************************** - * function: I2C_get - * - * description: - * Receive a buffer of data from the desired sender_addr - * If stop_flag is set, when the buffer is full and the - * sender does not signal STOP, generate a STOP signal. - * I2C is the master performing receiving. If no STOP signal - * is generated, the master can generate a START signal - * to another slave addr. - * - * note: this is master receive API - **********************************************************/ -static I2CStatus I2C_get (unsigned int eumbbar, unsigned char rcv_from, /* sender's address */ - unsigned char *buffer_ptr, /* pointer of receiving buffer */ - unsigned int length, /* length of the receiving buffer */ - unsigned int stop_flag, /* 1 - signal STOP when buffer is full - * 0 - no STOP signal when buffer is full - */ - unsigned int is_cnt) -{ /* 1 - this is a restart, don't check MBB - * 0 - this is a new start, check MBB - */ - if (buffer_ptr == 0 || length == 0) { - return I2CERROR; - } -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_get\n", __FILE__, __LINE__); -#endif - - RcvByte = 0; - ByteToRcv = length; - RcvBuf = buffer_ptr; - RcvBufFulStop = stop_flag; - - XmitByte = 0; - ByteToXmit = 0; - XmitBuf = 0; - - /* we are the master, start the transaction */ - return I2C_Start (eumbbar, rcv_from, RCV, is_cnt); - -} - -#if 0 /* turn off dead code */ -/********************************************************* - * function: I2C_write - * - * description: - * Send a buffer of data to the requiring master. - * If stop_flag is set, after the whole buffer is sent, - * generate a STOP signal provided that the requiring - * receiver doesn't signal the STOP in the middle. - * I2C is the slave performing transmitting. - * - * Note: this is slave xmit API. - * - * due to the current Kahlua design, slave transmitter - * shall not signal STOP since there is no way - * for master to detect it, causing I2C bus hung. - * - * For the above reason, the stop_flag is always - * set, i.e., 0. - * - * programmer shall use the timer on Kahlua to - * control the interval of data byte at the - * master side. - *******************************************************/ -static I2CStatus I2C_write (unsigned int eumbbar, unsigned char *buffer_ptr, /* pointer of data to be sent */ - unsigned int length, /* number of byte of in the buffer */ - unsigned int stop_flag) -{ /* 1 - signal STOP when buffer is empty - * 0 - no STOP signal when buffer is empty - */ - if (buffer_ptr == 0 || length == 0) { - return I2CERROR; - } - - XmitByte = 0; - ByteToXmit = length; - XmitBuf = buffer_ptr; - XmitBufEmptyStop = 0; /* in order to avoid bus hung, ignored the user's stop_flag */ - - RcvByte = 0; - ByteToRcv = 0; - RcvBuf = 0; - - /* we are the slave, just wait for being called, or pull */ - /* I2C_Timer_Event( eumbbar ); */ -} - -/****************************************************** - * function: I2C_read - * - * description: - * Receive a buffer of data from the sending master. - * If stop_flag is set, when the buffer is full and the - * sender does not signal STOP, generate a STOP signal. - * I2C is the slave performing receiving. - * - * note: this is slave receive API - ****************************************************/ -static I2CStatus I2C_read (unsigned int eumbbar, unsigned char *buffer_ptr, /* pointer of receiving buffer */ - unsigned int length, /* length of the receiving buffer */ - unsigned int stop_flag) -{ /* 1 - signal STOP when buffer is full - * 0 - no STOP signal when buffer is full - */ - if (buffer_ptr == 0 || length == 0) { - return I2CERROR; - } - - RcvByte = 0; - ByteToRcv = length; - RcvBuf = buffer_ptr; - RcvBufFulStop = stop_flag; - - XmitByte = 0; - ByteToXmit = 0; - XmitBuf = 0; - - /* wait for master to call us, or poll */ - /* I2C_Timer_Event( eumbbar ); */ -} -#endif /* turn off dead code */ - -/********************************************************* - * function: I2c_Timer_Event - * - * description: - * if interrupt is not used, this is the timer event handler. - * After each fixed time interval, this function can be called - * to check the I2C status and call appropriate function to - * handle the status event. - ********************************************************/ -static I2CStatus I2C_Timer_Event (unsigned int eumbbar, - I2CStatus (*handler) (unsigned int)) -{ - I2C_STAT stat; - -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_Timer_Event\n", __FILE__, __LINE__); -#endif - - stat = I2C_Get_Stat (eumbbar); - - if (stat.mif == 1) { - if (handler == 0) { - return I2C_ISR (eumbbar); - } else { - return (*handler) (eumbbar); - } - } - - return I2CNOEVENT; -} - - -/****************** Device I/O function *****************/ - -/****************************************************** - * function: I2C_Start - * - * description: Generate a START signal in the desired mode. - * I2C is the master. - * - * Return I2CSUCCESS if no error. - * - * note: - ****************************************************/ -static I2CStatus I2C_Start (unsigned int eumbbar, unsigned char slave_addr, /* address of the receiver */ - I2C_MODE mode, /* XMIT(1) - put (write) - * RCV(0) - get (read) - */ - unsigned int is_cnt) -{ /* 1 - this is a restart, don't check MBB - * 0 - this is a new start - */ - unsigned int tmp = 0; - I2C_STAT stat; - I2C_CTRL ctrl; - -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_Start addr 0x%x mode %d cnt %d\n", __FILE__, - __LINE__, slave_addr, mode, is_cnt); -#endif - - ctrl = I2C_Get_Ctrl (eumbbar); - - /* first make sure I2C has been initialized */ - if (ctrl.men == 0) { - return I2CERROR; - } - - /* next make sure bus is idle */ - stat = I2C_Get_Stat (eumbbar); - - if (is_cnt == 0 && stat.mbb == 1) { - /* sorry, we lost */ - return I2CBUSBUSY; - } else if (is_cnt == 1 && stat.mif == 1 && stat.mal == 0) { - /* sorry, we lost the bus */ - return I2CALOSS; - } - - - /* OK, I2C is enabled and we have the bus */ - - /* prepare to write the slave address */ - ctrl.msta = 1; - ctrl.mtx = 1; - ctrl.txak = 0; - ctrl.rsta = is_cnt; /* set the repeat start bit */ - I2C_Set_Ctrl (eumbbar, ctrl); - - /* write the slave address and xmit/rcv mode bit */ - tmp = load_runtime_reg (eumbbar, I2CDR); - tmp = (tmp & 0xffffff00) | - ((slave_addr & 0x007f) << 1) | - (mode == XMIT ? 0x0 : 0x1); - store_runtime_reg (eumbbar, I2CDR, tmp); - - if (mode == RCV) { - MasterRcvAddress = 1; - } else { - MasterRcvAddress = 0; - } - -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_Start exit\n", __FILE__, __LINE__); -#endif - - /* wait for the interrupt or poll */ - return I2CSUCCESS; -} - -/*********************************************************** - * function: I2c_Stop - * - * description: Generate a STOP signal to terminate the master - * transaction. - * return I2CSUCCESS - * - **********************************************************/ -static I2CStatus I2C_Stop (unsigned int eumbbar) -{ - I2C_CTRL ctrl; - -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_Stop enter\n", __FILE__, __LINE__); -#endif - - ctrl = I2C_Get_Ctrl (eumbbar); - ctrl.msta = 0; - I2C_Set_Ctrl (eumbbar, ctrl); - -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_Stop exit\n", __FILE__, __LINE__); -#endif - - return I2CSUCCESS; -} - -/**************************************************** - * function: I2C_Master_Xmit - * - * description: Master sends one byte of data to - * slave target - * - * return I2CSUCCESS if the byte transmitted. - * Otherwise no-zero - * - * Note: condition must meet when this function is called: - * I2CSR(MIF) == 1 && I2CSR(MCF) == 1 && I2CSR(RXAK) == 0 - * I2CCR(MSTA) == 1 && I2CCR(MTX) == 1 - * - ***************************************************/ -static I2CStatus I2C_Master_Xmit (unsigned int eumbbar) -{ - unsigned int val; - - if (ByteToXmit > 0) { - - if (ByteToXmit == XmitByte) { - /* all xmitted */ - ByteToXmit = 0; - - if (XmitBufEmptyStop == 1) { - I2C_Stop (eumbbar); - } - - return I2CBUFFEMPTY; - - } -#ifdef I2CDBG0 - PRINT ("%s(%d): xmit 0x%02x\n", __FILE__, __LINE__, - *(XmitBuf + XmitByte)); -#endif - - val = *(XmitBuf + XmitByte); - val &= 0x000000ff; - store_runtime_reg (eumbbar, I2CDR, val); - XmitByte++; - - return I2CSUCCESS; - - } - - return I2CBUFFEMPTY; -} - -/*********************************************** - * function: I2C_Master_Rcv - * - * description: master reads one byte data - * from slave source - * - * return I2CSUCCESS if no error - * - * Note: condition must meet when this function is called: - * I2CSR(MIF) == 1 && I2CSR(MCF) == 1 && - * I2CCR(MSTA) == 1 && I2CCR(MTX) == 0 - * - ***********************************************/ -static I2CStatus I2C_Master_Rcv (unsigned int eumbbar) -{ - I2C_CTRL ctrl; - unsigned int val; - - if (ByteToRcv > 0) { - - if (ByteToRcv - RcvByte == 2 && RcvBufFulStop == 1) { - /* master requests more than or equal to 2 bytes - * we are reading 2nd to last byte - */ - - /* we need to set I2CCR(TXAK) to generate a STOP */ - ctrl = I2C_Get_Ctrl (eumbbar); - ctrl.txak = 1; - I2C_Set_Ctrl (eumbbar, ctrl); - - /* Kahlua will automatically generate a STOP - * next time a transaction happens - */ - - /* note: the case of master requesting one byte is - * handled in I2C_ISR - */ - } - - /* generat a STOP before reading the last byte */ - if (RcvByte + 1 == ByteToRcv && RcvBufFulStop == 1) { - I2C_Stop (eumbbar); - } - - val = load_runtime_reg (eumbbar, I2CDR); - *(RcvBuf + RcvByte) = val & 0xFF; - -#ifdef I2CDBG0 - PRINT ("%s(%d): rcv 0x%02x\n", __FILE__, __LINE__, - *(RcvBuf + RcvByte)); -#endif - - RcvByte++; - - if (ByteToRcv == RcvByte) { - ByteToRcv = 0; - - return I2CBUFFFULL; - } - - return I2CSUCCESS; - } - - return I2CBUFFFULL; - -} - -/**************************************************** - * function: I2C_Slave_Xmit - * - * description: Slave sends one byte of data to - * requesting destination - * - * return SUCCESS if the byte transmitted. Otherwise - * No-zero - * - * Note: condition must meet when this function is called: - * I2CSR(MIF) == 1 && I2CSR(MCF) == 1 && I2CSR(RXAK) = 0 - * I2CCR(MSTA) == 0 && I2CCR(MTX) == 1 - * - ***************************************************/ -static I2CStatus I2C_Slave_Xmit (unsigned int eumbbar) -{ - unsigned int val; - - if (ByteToXmit > 0) { - - if (ByteToXmit == XmitByte) { - /* no more data to send */ - ByteToXmit = 0; - - /* - * do not toggle I2CCR(MTX). Doing so will - * cause bus-hung since current Kahlua design - * does not give master a way to detect slave - * stop. It is always a good idea for master - * to use timer to prevent the long long - * delays - */ - - return I2CBUFFEMPTY; - } -#ifdef I2CDBG - PRINT ("%s(%d): xmit 0x%02x\n", __FILE__, __LINE__, - *(XmitBuf + XmitByte)); -#endif - - val = *(XmitBuf + XmitByte); - val &= 0x000000ff; - store_runtime_reg (eumbbar, I2CDR, val); - XmitByte++; - - return I2CSUCCESS; - } - - return I2CBUFFEMPTY; -} - -/*********************************************** - * function: I2C_Slave_Rcv - * - * description: slave reads one byte data - * from master source - * - * return I2CSUCCESS if no error otherwise non-zero - * - * Note: condition must meet when this function is called: - * I2CSR(MIF) == 1 && I2CSR(MCF) == 1 && - * I2CCR(MSTA) == 0 && I2CCR(MTX) = 0 - * - ***********************************************/ -static I2CStatus I2C_Slave_Rcv (unsigned int eumbbar) -{ - unsigned int val; - I2C_CTRL ctrl; - - if (ByteToRcv > 0) { - val = load_runtime_reg (eumbbar, I2CDR); - *(RcvBuf + RcvByte) = val & 0xff; -#ifdef I2CDBG - PRINT ("%s(%d): rcv 0x%02x\n", __FILE__, __LINE__, - *(RcvBuf + RcvByte)); -#endif - RcvByte++; - - if (ByteToRcv == RcvByte) { - if (RcvBufFulStop == 1) { - /* all done */ - ctrl = I2C_Get_Ctrl (eumbbar); - ctrl.txak = 1; - I2C_Set_Ctrl (eumbbar, ctrl); - } - - ByteToRcv = 0; - return I2CBUFFFULL; - } - - return I2CSUCCESS; - } - - return I2CBUFFFULL; -} - -/****************** Device Control Function *************/ - -/********************************************************* - * function: I2C_Init - * - * description: Initialize I2C unit with desired frequency divider, - * master's listening address, with interrupt enabled - * or disabled. - * - * note: - ********************************************************/ -static I2CStatus I2C_Init (unsigned int eumbbar, unsigned char fdr, /* frequency divider */ - unsigned char slave_addr, /* driver's address used for receiving */ - unsigned int en_int) -{ /* 1 - enable I2C interrupt - * 0 - disable I2C interrup - */ - I2C_CTRL ctrl; - unsigned int tmp; - -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_Init enter\n", __FILE__, __LINE__); -#endif - - ctrl = I2C_Get_Ctrl (eumbbar); - /* disable the I2C module before we change everything */ - ctrl.men = 0; - I2C_Set_Ctrl (eumbbar, ctrl); - - /* set the frequency diver */ - tmp = load_runtime_reg (eumbbar, I2CFDR); - tmp = (tmp & 0xffffffc0) | (fdr & 0x3f); - store_runtime_reg (eumbbar, I2CFDR, tmp); - - /* Set our listening (slave) address */ - tmp = load_runtime_reg (eumbbar, I2CADR); - tmp = (tmp & 0xffffff01) | ((slave_addr & 0x7f) << 1); - store_runtime_reg (eumbbar, I2CADR, tmp); - - /* enable I2C with desired interrupt setting */ - ctrl.men = 1; - ctrl.mien = en_int & 0x1; - I2C_Set_Ctrl (eumbbar, ctrl); -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_Init exit\n", __FILE__, __LINE__); -#endif - - return I2CSUCCESS; - -} - -/***************************************** - * function I2c_Get_Stat - * - * description: Query I2C Status, i.e., read I2CSR - * - ****************************************/ -static I2C_STAT I2C_Get_Stat (unsigned int eumbbar) -{ - unsigned int temp; - I2C_STAT stat; - - temp = load_runtime_reg (eumbbar, I2CSR); - -#ifdef I2CDBG0 - PRINT ("%s(%d): get stat = 0x%08x\n", __FILE__, __LINE__, temp); -#endif - - stat.rsrv0 = (temp & 0xffffff00) >> 8; - stat.mcf = (temp & 0x00000080) >> 7; - stat.maas = (temp & 0x00000040) >> 6; - stat.mbb = (temp & 0x00000020) >> 5; - stat.mal = (temp & 0x00000010) >> 4; - stat.rsrv1 = (temp & 0x00000008) >> 3; - stat.srw = (temp & 0x00000004) >> 2; - stat.mif = (temp & 0x00000002) >> 1; - stat.rxak = (temp & 0x00000001); - return stat; -} - -/********************************************* - * function: I2c_Set_Ctrl - * - * description: Change I2C Control bits, - * i.e., write to I2CCR - * - ********************************************/ -static void I2C_Set_Ctrl (unsigned int eumbbar, I2C_CTRL ctrl) -{ /* new control value */ - unsigned int temp = load_runtime_reg (eumbbar, I2CCR); - - temp &= 0xffffff03; - temp |= ((ctrl.men & 0x1) << 7); - temp |= ((ctrl.mien & 0x1) << 6); - temp |= ((ctrl.msta & 0x1) << 5); - temp |= ((ctrl.mtx & 0x1) << 4); - temp |= ((ctrl.txak & 0x1) << 3); - temp |= ((ctrl.rsta & 0x1) << 2); -#ifdef I2CDBG0 - PRINT ("%s(%d): set ctrl = 0x%08x\n", __FILE__, __LINE__, temp); -#endif - store_runtime_reg (eumbbar, I2CCR, temp); - -} - -/***************************************** - * function: I2C_Get_Ctrl - * - * description: Query I2C Control bits, - * i.e., read I2CCR - *****************************************/ -static I2C_CTRL I2C_Get_Ctrl (unsigned int eumbbar) -{ - union { - I2C_CTRL ctrl; - unsigned int temp; - } s; - - s.temp = load_runtime_reg (eumbbar, I2CCR); -#ifdef I2CDBG0 - PRINT ("%s(%d): get ctrl = 0x%08x\n", __FILE__, __LINE__, s.temp); -#endif - - return s.ctrl; -} - - -/**************************************** - * function: I2C_Slave_Addr - * - * description: Process slave address phase. - * return I2CSUCCESS if no error - * - * note: Precondition for calling this function: - * I2CSR(MIF) == 1 && - * I2CSR(MAAS) == 1 - ****************************************/ -static I2CStatus I2C_Slave_Addr (unsigned int eumbbar) -{ - I2C_STAT stat = I2C_Get_Stat (eumbbar); - I2C_CTRL ctrl = I2C_Get_Ctrl (eumbbar); - - if (stat.srw == 1) { - /* we are asked to xmit */ - ctrl.mtx = 1; - I2C_Set_Ctrl (eumbbar, ctrl); /* set MTX */ - return I2C_Slave_Xmit (eumbbar); - } - - /* we are asked to receive data */ - ctrl.mtx = 0; - I2C_Set_Ctrl (eumbbar, ctrl); - (void) load_runtime_reg (eumbbar, I2CDR); /* do a fake read to start */ - - return I2CADDRESS; -} - -/*********************************************** - * function: I2C_ISR - * - * description: I2C Interrupt service routine - * - * note: Precondition: - * I2CSR(MIF) == 1 - **********************************************/ -static I2CStatus I2C_ISR (unsigned int eumbbar) -{ - I2C_STAT stat; - I2C_CTRL ctrl; - -#ifdef I2CDBG0 - PRINT ("%s(%d): I2C_ISR\n", __FILE__, __LINE__); -#endif - - stat = I2C_Get_Stat (eumbbar); - ctrl = I2C_Get_Ctrl (eumbbar); - - /* clear MIF */ - stat.mif = 0; - - /* Now let see what kind of event this is */ - if (stat.mcf == 1) { - /* transfer compete */ - - /* clear the MIF bit */ - I2C_Set_Stat (eumbbar, stat); - - if (ctrl.msta == 1) { - /* master */ - if (ctrl.mtx == 1) { - /* check if this is the address phase for master receive */ - if (MasterRcvAddress == 1) { - /* Yes, it is the address phase of master receive */ - ctrl.mtx = 0; - /* now check how much we want to receive */ - if (ByteToRcv == 1 && RcvBufFulStop == 1) { - ctrl.txak = 1; - } - - I2C_Set_Ctrl (eumbbar, ctrl); - (void) load_runtime_reg (eumbbar, I2CDR); /* fake read first */ - - MasterRcvAddress = 0; - return I2CADDRESS; - - } - - /* master xmit */ - if (stat.rxak == 0) { - /* slave has acknowledged */ - return I2C_Master_Xmit (eumbbar); - } - - /* slave has not acknowledged yet, generate a STOP */ - if (XmitBufEmptyStop == 1) { - ctrl.msta = 0; - I2C_Set_Ctrl (eumbbar, ctrl); - } - - return I2CSUCCESS; - } - - /* master receive */ - return I2C_Master_Rcv (eumbbar); - } - - /* slave */ - if (ctrl.mtx == 1) { - /* slave xmit */ - if (stat.rxak == 0) { - /* master has acknowledged */ - return I2C_Slave_Xmit (eumbbar); - } - - /* master has not acknowledged, wait for STOP */ - /* do nothing for preventing bus from hung */ - return I2CSUCCESS; - } - - /* slave rcv */ - return I2C_Slave_Rcv (eumbbar); - - } else if (stat.maas == 1) { - /* received a call from master */ - - /* clear the MIF bit */ - I2C_Set_Stat (eumbbar, stat); - - /* master is calling us, process the address phase */ - return I2C_Slave_Addr (eumbbar); - } else { - /* has to be arbitration lost */ - stat.mal = 0; - I2C_Set_Stat (eumbbar, stat); - - ctrl.msta = 0; /* return to receive mode */ - I2C_Set_Ctrl (eumbbar, ctrl); - } - - return I2CSUCCESS; - -} - -/****************************************************** - * function: I2C_Set_Stat - * - * description: modify the I2CSR - * - *****************************************************/ -static void I2C_Set_Stat (unsigned int eumbbar, I2C_STAT stat) -{ - union { - unsigned int val; - I2C_STAT stat; - } s_tmp; - union { - unsigned int val; - I2C_STAT stat; - } s; - - s.val = load_runtime_reg (eumbbar, I2CSR); - s.val &= 0xffffff08; - s_tmp.stat = stat; - s.val |= (s_tmp.val & 0xf7); - -#ifdef I2CDBG0 - PRINT ("%s(%d): set stat = 0x%08x\n", __FILE__, __LINE__, s.val); -#endif - - store_runtime_reg (eumbbar, I2CSR, s.val); - -} - -/****************************************************** - * The following are routines to glue the rest of - * U-Boot to the Sandpoint I2C driver. - *****************************************************/ - -void i2c_init (int speed, int slaveadd) -{ -#ifdef CFG_I2C_INIT_BOARD - /* - * call board specific i2c bus reset routine before accessing the - * environment, which might be in a chip on that bus. For details - * about this problem see doc/I2C_Edge_Conditions. - */ - i2c_init_board(); -#endif - -#ifdef DEBUG - I2C_Initialize (0x7f, 0, (void *) printf); -#else - I2C_Initialize (0x7f, 0, 0); -#endif -} - -int i2c_probe (uchar chip) -{ - int tmp; - - /* - * Try to read the first location of the chip. The underlying - * driver doesn't appear to support sending just the chip address - * and looking for an <ACK> back. - */ - udelay(10000); - return i2c_read (chip, 0, 1, (char *)&tmp, 1); -} - -int i2c_read (uchar chip, uint addr, int alen, uchar * buffer, int len) -{ - I2CStatus status; - uchar xaddr[4]; - - if (alen > 0) { - xaddr[0] = (addr >> 24) & 0xFF; - xaddr[1] = (addr >> 16) & 0xFF; - xaddr[2] = (addr >> 8) & 0xFF; - xaddr[3] = addr & 0xFF; - - status = I2C_do_buffer (0, I2C_MASTER_XMIT, chip, alen, - &xaddr[4 - alen], I2C_NO_STOP, 1, - I2C_NO_RESTART); - if (status != I2C_SUCCESS) { - PRINT ("i2c_read: can't send data address for read\n"); - return 1; - } - } - - /* The data transfer will be a continuation. */ - status = I2C_do_buffer (0, I2C_MASTER_RCV, chip, len, - buffer, I2C_STOP, 1, (alen > 0 ? I2C_RESTART : - I2C_NO_RESTART)); - - if (status != I2C_SUCCESS) { - PRINT ("i2c_read: can't perform data transfer\n"); - return 1; - } - - return 0; -} - -int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len) -{ - I2CStatus status; - uchar dummy_buffer[I2C_RXTX_LEN + 2]; - uchar *p; - int i; - - /* fill in address in big endian order */ - for (i=alen-1; i>=0; --i) { - buffer[i] = addr & 0xFF; - addr >>= 8; - } - /* fill in data */ - p = dummy_buffer + alen; - - for (i=0; i<len; ++i) - *p++ = *buffer++; - - status = I2C_do_buffer (0, I2C_MASTER_XMIT, chip, alen + len, - dummy_buffer, I2C_STOP, 1, I2C_NO_RESTART); - -#ifdef CFG_EEPROM_PAGE_WRITE_DELAY_MS - udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000); -#endif - if (status != I2C_SUCCESS) { - PRINT ("i2c_write: can't perform data transfer\n"); - return 1; - } - - return 0; -} - -uchar i2c_reg_read (uchar i2c_addr, uchar reg) -{ - char buf[1]; - - i2c_init (0, 0); - - i2c_read (i2c_addr, reg, 1, buf, 1); - - return (buf[0]); -} - -void i2c_reg_write (uchar i2c_addr, uchar reg, uchar val) -{ - i2c_init (0, 0); - - i2c_write (i2c_addr, reg, 1, &val, 1); -} - -#endif /* CONFIG_HARD_I2C */ diff --git a/cpu/mpc824x/drivers/i2c/i2c2.S b/cpu/mpc824x/drivers/i2c/i2c2.S deleted file mode 100644 index 3fd7e03fe48..00000000000 --- a/cpu/mpc824x/drivers/i2c/i2c2.S +++ /dev/null @@ -1,52 +0,0 @@ -/************************************** - * - * copyright @ Motorola, 1999 - * - **************************************/ - -#include <config.h> -#ifdef CONFIG_HARD_I2C -#include <ppc_asm.tmpl> -#include <asm/mmu.h> -/********************************************************** - * function: load_runtime_reg - * - * input: r3 - value of eumbbar - * r4 - register offset in embedded utility space - * - * output: r3 - register content - **********************************************************/ - .text - .align 2 - .global load_runtime_reg -load_runtime_reg: - -/* xor r5,r5,r5 - * or r5,r5,r3 - * - * lwbrx r3,r4,r5 - */ - lwbrx r3,r4,r3 - sync - - bclr 20, 0 - -/**************************************************************** - * function: store_runtime_reg - * - * input: r3 - value of eumbbar - * r4 - register offset in embedded utility space - * r5 - new value to be stored - * - ****************************************************************/ - .text - .align 2 - .global store_runtime_reg -store_runtime_reg: - - stwbrx r5, r4, r3 - sync - - bclr 20,0 - -#endif /* CONFIG_HARD_I2C */ diff --git a/cpu/mpc824x/drivers/i2c/i2c_export.h b/cpu/mpc824x/drivers/i2c/i2c_export.h deleted file mode 100644 index 6264d189bb2..00000000000 --- a/cpu/mpc824x/drivers/i2c/i2c_export.h +++ /dev/null @@ -1,103 +0,0 @@ -#ifndef I2C_EXPORT_H -#define I2C_EXPORT_H - -/**************************************************** - * - * Copyright Motrola 1999 - * - ****************************************************/ - -/* These are the defined return values for the I2C_do_transaction function. - * Any non-zero value indicates failure. Failure modes can be added for - * more detailed error reporting. - */ -typedef enum _i2c_status -{ - I2C_SUCCESS = 0, - I2C_ERROR, -} I2C_Status; - -/* These are the defined tasks for I2C_do_transaction. - * Modes for SLAVE_RCV and SLAVE_XMIT will be added. - */ -typedef enum _i2c_transaction_mode -{ - I2C_MASTER_RCV = 0, - I2C_MASTER_XMIT = 1, -} I2C_TRANSACTION_MODE; - -typedef enum _i2c_interrupt_mode -{ - I2C_INT_DISABLE = 0, - I2C_INT_ENABLE = 1, -} I2C_INTERRUPT_MODE; - -typedef enum _i2c_stop -{ - I2C_NO_STOP = 0, - I2C_STOP = 1, -} I2C_STOP_MODE; - -typedef enum _i2c_restart -{ - I2C_NO_RESTART = 0, - I2C_RESTART = 1, -} I2C_RESTART_MODE; - -/******************** App. API ******************** - * The application API is for user level application - * to use the functionality provided by I2C driver. - * This is a "generic" I2C interface, it should contain - * nothing specific to the Kahlua implementation. - * Only the generic functions are exported by the library. - * - * Note: Its App.s responsibility to swap the data - * byte. In our API, we just transfer whatever - * we are given - **************************************************/ - - -/* Initialize I2C unit with the following: - * driver's slave address - * interrupt enabled - * optional pointer to application layer print function - * - * These parameters may be added: - * desired clock rate - * digital filter frequency sampling rate - * - * This function must be called before I2C unit can be used. - */ -extern I2C_Status I2C_Initialize( - unsigned char addr, /* driver's I2C slave address */ - I2C_INTERRUPT_MODE en_int, /* 1 - enable I2C interrupt - * 0 - disable I2C interrupt - */ - int (*app_print_function)(char *,...)); /* pointer to optional "printf" - * provided by application - */ - -/* Perform the given I2C transaction, only MASTER_XMIT and MASTER_RCV - * are implemented. Both are only in polling mode. - * - * en_int controls interrupt/polling mode - * act is the type of transaction - * addr is the I2C address of the slave device - * len is the length of data to send or receive - * buffer is the address of the data buffer - * stop = I2C_NO_STOP, don't signal STOP at end of transaction - * I2C_STOP, signal STOP at end of transaction - * retry is the timeout retry value, currently ignored - * rsta = I2C_NO_RESTART, this is not continuation of existing transaction - * I2C_RESTART, this is a continuation of existing transaction - */ -extern I2C_Status I2C_do_transaction( I2C_INTERRUPT_MODE en_int, - I2C_TRANSACTION_MODE act, - unsigned char i2c_addr, - unsigned char data_addr, - int len, - char *buffer, - I2C_STOP_MODE stop, - int retry, - I2C_RESTART_MODE rsta); -#endif |