ARMV7: Restructure OMAP i2c driver to allow code sharing between OMAP3 and OMAP4
This patch modifies the omap24xx driver so that it will also work with OMAP4. Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
This commit is contained in:
Steve Sakoman
Sandeep Paulraj
parent
bec3dc7599
commit
938717cee1
@ -20,9 +20,10 @@
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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 _I2C_H_
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#define _I2C_H_
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#ifndef _OMAP3_I2C_H_
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#define _OMAP3_I2C_H_
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#define I2C_BUS_MAX 3
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#define I2C_DEFAULT_BASE I2C_BASE1
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struct i2c {
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@ -58,146 +59,4 @@ struct i2c {
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unsigned short res15;
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};
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#define I2C_BUS_MAX 3
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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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#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 /* _I2C_H_ */
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#endif /* _OMAP3_I2C_H_ */
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74
arch/arm/include/asm/arch-omap4/i2c.h
Normal file
74
arch/arm/include/asm/arch-omap4/i2c.h
Normal file
@ -0,0 +1,74 @@
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/*
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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 _OMAP4_I2C_H_
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#define _OMAP4_I2C_H_
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#define I2C_BUS_MAX 3
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#define I2C_DEFAULT_BASE I2C_BASE1
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struct i2c {
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unsigned short revnb_lo; /* 0x00 */
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unsigned short res1;
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unsigned short revnb_hi; /* 0x04 */
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unsigned short res2[13];
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unsigned short sysc; /* 0x20 */
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unsigned short res3;
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unsigned short irqstatus_raw; /* 0x24 */
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unsigned short res4;
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unsigned short stat; /* 0x28 */
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unsigned short res5;
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unsigned short ie; /* 0x2C */
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unsigned short res6;
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unsigned short irqenable_clr; /* 0x30 */
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unsigned short res7;
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unsigned short iv; /* 0x34 */
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unsigned short res8[45];
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unsigned short syss; /* 0x90 */
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unsigned short res9;
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unsigned short buf; /* 0x94 */
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unsigned short res10;
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unsigned short cnt; /* 0x98 */
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unsigned short res11;
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unsigned short data; /* 0x9C */
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unsigned short res13;
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unsigned short res14; /* 0xA0 */
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unsigned short res15;
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unsigned short con; /* 0xA4 */
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unsigned short res16;
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unsigned short oa; /* 0xA8 */
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unsigned short res17;
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unsigned short sa; /* 0xAC */
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unsigned short res18;
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unsigned short psc; /* 0xB0 */
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unsigned short res19;
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unsigned short scll; /* 0xB4 */
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unsigned short res20;
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unsigned short sclh; /* 0xB8 */
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unsigned short res21;
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unsigned short systest; /* 0xBC */
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unsigned short res22;
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unsigned short bufstat; /* 0xC0 */
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unsigned short res23;
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};
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#endif /* _OMAP4_I2C_H_ */
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@ -25,6 +25,8 @@
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#include <asm/arch/i2c.h>
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#include <asm/io.h>
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#include "omap24xx_i2c.h"
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static void wait_for_bb (void);
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static u16 wait_for_pin (void);
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static void flush_fifo(void);
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@ -176,7 +178,8 @@ static int i2c_read_byte (u8 devaddr, u8 regoffset, u8 * value)
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status = wait_for_pin ();
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if (status & I2C_STAT_RRDY) {
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#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
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#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
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defined(CONFIG_OMAP44XX)
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*value = readb (&i2c_base->data);
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#else
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*value = readw (&i2c_base->data);
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@ -221,7 +224,8 @@ static int i2c_write_byte (u8 devaddr, u8 regoffset, u8 value)
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status = wait_for_pin ();
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if (status & I2C_STAT_XRDY) {
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#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
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#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
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defined(CONFIG_OMAP44XX)
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/* send out 1 byte */
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writeb (regoffset, &i2c_base->data);
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writew (I2C_STAT_XRDY, &i2c_base->stat);
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@ -274,7 +278,8 @@ static void flush_fifo(void)
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while(1){
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stat = readw(&i2c_base->stat);
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if(stat == I2C_STAT_RRDY){
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#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX)
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#if defined(CONFIG_OMAP243X) || defined(CONFIG_OMAP34XX) || \
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defined(CONFIG_OMAP44XX)
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readb(&i2c_base->data);
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#else
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readw(&i2c_base->data);
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@ -435,3 +440,9 @@ int i2c_set_bus_num(unsigned int bus)
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return 0;
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}
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int i2c_get_bus_num(void)
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{
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return (int) current_bus;
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}
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166
drivers/i2c/omap24xx_i2c.h
Normal file
166
drivers/i2c/omap24xx_i2c.h
Normal file
@ -0,0 +1,166 @@
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/*
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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 _OMAP24XX_I2C_H_
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#define _OMAP24XX_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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#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
|
||||
|
||||
#define SYSTEM_CLOCK_12 12000000
|
||||
#define SYSTEM_CLOCK_13 13000000
|
||||
#define SYSTEM_CLOCK_192 19200000
|
||||
#define SYSTEM_CLOCK_96 96000000
|
||||
|
||||
/* Use the reference value of 96MHz if not explicitly set by the board */
|
||||
#ifndef I2C_IP_CLK
|
||||
#define I2C_IP_CLK SYSTEM_CLOCK_96
|
||||
#endif
|
||||
|
||||
/*
|
||||
* The reference minimum clock for high speed is 19.2MHz.
|
||||
* The linux 2.6.30 kernel uses this value.
|
||||
* The reference minimum clock for fast mode is 9.6MHz
|
||||
* The reference minimum clock for standard mode is 4MHz
|
||||
* In TRM, the value of 12MHz is used.
|
||||
*/
|
||||
#ifndef I2C_INTERNAL_SAMPLING_CLK
|
||||
#define I2C_INTERNAL_SAMPLING_CLK 19200000
|
||||
#endif
|
||||
|
||||
/*
|
||||
* The equation for the low and high time is
|
||||
* tlow = scll + scll_trim = (sampling clock * tlow_duty) / speed
|
||||
* thigh = sclh + sclh_trim = (sampling clock * (1 - tlow_duty)) / speed
|
||||
*
|
||||
* If the duty cycle is 50%
|
||||
*
|
||||
* tlow = scll + scll_trim = sampling clock / (2 * speed)
|
||||
* thigh = sclh + sclh_trim = sampling clock / (2 * speed)
|
||||
*
|
||||
* In TRM
|
||||
* scll_trim = 7
|
||||
* sclh_trim = 5
|
||||
*
|
||||
* The linux 2.6.30 kernel uses
|
||||
* scll_trim = 6
|
||||
* sclh_trim = 6
|
||||
*
|
||||
* These are the trim values for standard and fast speed
|
||||
*/
|
||||
#ifndef I2C_FASTSPEED_SCLL_TRIM
|
||||
#define I2C_FASTSPEED_SCLL_TRIM 6
|
||||
#endif
|
||||
#ifndef I2C_FASTSPEED_SCLH_TRIM
|
||||
#define I2C_FASTSPEED_SCLH_TRIM 6
|
||||
#endif
|
||||
|
||||
/* These are the trim values for high speed */
|
||||
#ifndef I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM
|
||||
#define I2C_HIGHSPEED_PHASE_ONE_SCLL_TRIM I2C_FASTSPEED_SCLL_TRIM
|
||||
#endif
|
||||
#ifndef I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM
|
||||
#define I2C_HIGHSPEED_PHASE_ONE_SCLH_TRIM I2C_FASTSPEED_SCLH_TRIM
|
||||
#endif
|
||||
#ifndef I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM
|
||||
#define I2C_HIGHSPEED_PHASE_TWO_SCLL_TRIM I2C_FASTSPEED_SCLL_TRIM
|
||||
#endif
|
||||
#ifndef I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM
|
||||
#define I2C_HIGHSPEED_PHASE_TWO_SCLH_TRIM I2C_FASTSPEED_SCLH_TRIM
|
||||
#endif
|
||||
|
||||
#define I2C_PSC_MAX 0x0f
|
||||
#define I2C_PSC_MIN 0x00
|
||||
|
||||
#endif /* _OMAP24XX_I2C_H_ */
|
||||
Loading…
Reference in New Issue
Block a user