9e26c86850
robustness of IIC transactions when parts aren't present. This also removes a bunch of debug. This also moves this driver to 7-1 addressing rather than 6-0 addressing, which is more inline with all the other iic drivers in the tree. I've tested this for about a million years on the systems at work.
83 lines
3.6 KiB
C
83 lines
3.6 KiB
C
/*-
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* Copyright (c) 2006 M. Warner Losh. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* $FreeBSD$ */
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#ifndef ARM_AT91_AT91_TWIREG_H
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#define ARM_AT91_AT91_TWIREG_H
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#define TWI_CR 0x00 /* TWI Control Register */
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#define TWI_MMR 0x04 /* TWI Master Mode Register */
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#define TWI_SMR 0x08 /* TWI Master Mode Register */
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#define TWI_IADR 0x0c /* TWI Internal Address Register */
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#define TWI_CWGR 0x10 /* TWI Clock Waveform Generator Reg */
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/* 0x14 reserved */
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/* 0x18 reserved */
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/* 0x1c reserved */
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#define TWI_SR 0x20 /* TWI Status Register */
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#define TWI_IER 0x24 /* TWI Interrupt Enable Register */
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#define TWI_IDR 0x28 /* TWI Interrupt Disable Register */
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#define TWI_IMR 0x2c /* TWI Interrupt Mask Register */
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#define TWI_RHR 0x30 /* TWI Receiver Holding Register */
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#define TWI_THR 0x34 /* TWI Transmit Holding Register */
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/* TWI_CR */
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#define TWI_CR_START (1U << 0) /* Send a start */
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#define TWI_CR_STOP (1U << 1) /* Send a stop */
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#define TWI_CR_MSEN (1U << 2) /* Master Transfer Enable */
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#define TWI_CR_MSDIS (1U << 3) /* Master Transfer Disable */
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#define TWI_CR_SVEN (1U << 4) /* Slave Transfer Enable */
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#define TWI_CR_SVDIS (1U << 5) /* Slave Transfer Disable */
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#define TWI_CR_SWRST (1U << 7) /* Software Reset */
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/* TWI_MMR */
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/* TWI_SMR */
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#define TWI_MMR_IADRSZ(n) ((n) << 8) /* Set size of transfer */
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#define TWI_MMR_MWRITE 0U /* Master Read Direction */
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#define TWI_MMR_MREAD (1U << 12) /* Master Read Direction */
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#define TWI_MMR_DADR(n) ((n) << 15) /* Device Address */
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/* TWI_CWGR */
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#define TWI_CWGR_CKDIV(x) ((x) << 16) /* Clock Divider */
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#define TWI_CWGR_CHDIV(x) ((x) << 8) /* Clock High Divider */
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#define TWI_CWGR_CLDIV(x) ((x) << 0) /* Clock Low Divider */
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#define TWI_CWGR_DIV(rate) ((AT91C_MASTER_CLOCK /(4*(rate))) - 2)
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/* TWI_SR */
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/* TWI_IER */
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/* TWI_IDR */
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/* TWI_IMR */
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#define TWI_SR_TXCOMP (1U << 0) /* Transmission Completed */
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#define TWI_SR_RXRDY (1U << 1) /* Receive Holding Register Ready */
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#define TWI_SR_TXRDY (1U << 2) /* Transmit Holding Register Ready */
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#define TWI_SR_SVREAD (1U << 3) /* Slave Read */
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#define TWI_SR_SVACC (1U << 4) /* Slave Access */
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#define TWI_SR_GCACC (1U << 5) /* General Call Access */
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#define TWI_SR_OVRE (1U << 6) /* Overrun error */
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#define TWI_SR_UNRE (1U << 7) /* Underrun Error */
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#define TWI_SR_NACK (1U << 8) /* Not Acknowledged */
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#define TWI_SR_ARBLST (1U << 9) /* Arbitration Lost */
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#endif /* ARM_AT91_AT91_TWIREG_H */
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