mirror of
https://github.com/AsahiLinux/u-boot
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cec487a435
This reverts commits 2faa76196a as
this has introduced some large problems on all other platforms and have
more changes in them than the commit message implies.
Cc: Heiko Schocher <hs@denx.de>
Cc: Patil, Rachna <rachna@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>
170 lines
5.9 KiB
C
170 lines
5.9 KiB
C
/*
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* (C) Copyright 2004-2010
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* Texas Instruments, <www.ti.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef _OMAP2PLUS_I2C_H_
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#define _OMAP2PLUS_I2C_H_
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/* I2C masks */
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/* I2C Interrupt Enable Register (I2C_IE): */
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#define I2C_IE_GC_IE (1 << 5)
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#define I2C_IE_XRDY_IE (1 << 4) /* Transmit data ready interrupt enable */
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#define I2C_IE_RRDY_IE (1 << 3) /* Receive data ready interrupt enable */
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#define I2C_IE_ARDY_IE (1 << 2) /* Register access ready interrupt enable */
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#define I2C_IE_NACK_IE (1 << 1) /* No acknowledgment interrupt enable */
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#define I2C_IE_AL_IE (1 << 0) /* Arbitration lost interrupt enable */
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/* I2C Status Register (I2C_STAT): */
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#define I2C_STAT_SBD (1 << 15) /* Single byte data */
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#define I2C_STAT_BB (1 << 12) /* Bus busy */
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#define I2C_STAT_ROVR (1 << 11) /* Receive overrun */
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#define I2C_STAT_XUDF (1 << 10) /* Transmit underflow */
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#define I2C_STAT_AAS (1 << 9) /* Address as slave */
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#define I2C_STAT_GC (1 << 5)
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#define I2C_STAT_XRDY (1 << 4) /* Transmit data ready */
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#define I2C_STAT_RRDY (1 << 3) /* Receive data ready */
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#define I2C_STAT_ARDY (1 << 2) /* Register access ready */
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#define I2C_STAT_NACK (1 << 1) /* No acknowledgment interrupt enable */
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#define I2C_STAT_AL (1 << 0) /* Arbitration lost interrupt enable */
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/* I2C Interrupt Code Register (I2C_INTCODE): */
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#define I2C_INTCODE_MASK 7
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#define I2C_INTCODE_NONE 0
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#define I2C_INTCODE_AL 1 /* Arbitration lost */
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#define I2C_INTCODE_NAK 2 /* No acknowledgement/general call */
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#define I2C_INTCODE_ARDY 3 /* Register access ready */
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#define I2C_INTCODE_RRDY 4 /* Rcv data ready */
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#define I2C_INTCODE_XRDY 5 /* Xmit data ready */
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/* I2C Buffer Configuration Register (I2C_BUF): */
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#define I2C_BUF_RDMA_EN (1 << 15) /* Receive DMA channel enable */
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#define I2C_BUF_XDMA_EN (1 << 7) /* Transmit DMA channel enable */
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/* I2C Configuration Register (I2C_CON): */
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#define I2C_CON_EN (1 << 15) /* I2C module enable */
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#define I2C_CON_BE (1 << 14) /* Big endian mode */
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#define I2C_CON_STB (1 << 11) /* Start byte mode (master mode only) */
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#define I2C_CON_MST (1 << 10) /* Master/slave mode */
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#define I2C_CON_TRX (1 << 9) /* Transmitter/receiver mode */
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/* (master mode only) */
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#define I2C_CON_XA (1 << 8) /* Expand address */
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#define I2C_CON_STP (1 << 1) /* Stop condition (master mode only) */
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#define I2C_CON_STT (1 << 0) /* Start condition (master mode only) */
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/* I2C System Test Register (I2C_SYSTEST): */
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#define I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */
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#define I2C_SYSTEST_FREE (1 << 14) /* Free running mode, on brkpoint) */
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#define I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */
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#define I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */
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#define I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense input value */
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#define I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive output value */
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#define I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense input value */
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#define I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive output value */
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/* I2C System Status Register (I2C_SYSS): */
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#define I2C_SYSS_RDONE (1 << 0) /* Internel reset monitoring */
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#define I2C_SCLL_SCLL 0
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#define I2C_SCLL_SCLL_M 0xFF
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#define I2C_SCLL_HSSCLL 8
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#define I2C_SCLH_HSSCLL_M 0xFF
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#define I2C_SCLH_SCLH 0
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#define I2C_SCLH_SCLH_M 0xFF
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#define I2C_SCLH_HSSCLH 8
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#define I2C_SCLH_HSSCLH_M 0xFF
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#define OMAP_I2C_STANDARD 100000
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#define OMAP_I2C_FAST_MODE 400000
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#define OMAP_I2C_HIGH_SPEED 3400000
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#define SYSTEM_CLOCK_12 12000000
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#define SYSTEM_CLOCK_13 13000000
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#define SYSTEM_CLOCK_192 19200000
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#define SYSTEM_CLOCK_96 96000000
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/* Use the reference value of 96MHz if not explicitly set by the board */
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#ifndef I2C_IP_CLK
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#define I2C_IP_CLK SYSTEM_CLOCK_96
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#endif
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/*
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* The reference minimum clock for high speed is 19.2MHz.
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* The linux 2.6.30 kernel uses this value.
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* The reference minimum clock for fast mode is 9.6MHz
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* The reference minimum clock for standard mode is 4MHz
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* In TRM, the value of 12MHz is used.
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*/
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#ifndef I2C_INTERNAL_SAMPLING_CLK
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#define I2C_INTERNAL_SAMPLING_CLK 19200000
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#endif
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/*
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* The equation for the low and high time is
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* tlow = scll + scll_trim = (sampling clock * tlow_duty) / speed
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* thigh = sclh + sclh_trim = (sampling clock * (1 - tlow_duty)) / speed
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*
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* If the duty cycle is 50%
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*
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* tlow = scll + scll_trim = sampling clock / (2 * speed)
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* thigh = sclh + sclh_trim = sampling clock / (2 * speed)
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*
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* In TRM
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* scll_trim = 7
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* sclh_trim = 5
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*
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* The linux 2.6.30 kernel uses
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* scll_trim = 6
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* sclh_trim = 6
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*
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* These are the trim values for standard and fast speed
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*/
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#ifndef I2C_FASTSPEED_SCLL_TRIM
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#define I2C_FASTSPEED_SCLL_TRIM 6
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#endif
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#ifndef I2C_FASTSPEED_SCLH_TRIM
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#define I2C_FASTSPEED_SCLH_TRIM 6
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#endif
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/* These are the trim values for high speed */
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#ifndef I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM
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#define I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM I2C_FASTSPEED_SCLL_TRIM
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#endif
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#ifndef I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM
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#define I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM I2C_FASTSPEED_SCLH_TRIM
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#endif
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#ifndef I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM
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#define I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM I2C_FASTSPEED_SCLL_TRIM
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#endif
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#ifndef I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM
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#define I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM I2C_FASTSPEED_SCLH_TRIM
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#endif
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#define I2C_PSC_MAX 0x0f
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#define I2C_PSC_MIN 0x00
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#endif /* _OMAP24XX_I2C_H_ */
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