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To enter high speed mode, following steps should be done: 1. When running in high speed mode, i2c clock rate is different from standard mode. Clock rate must be set according to specification first. 2. When i2c controller sends a master code and wins arbitration, high speed mode is entered. If you want to enable high speed mode, the following members of platform data should be set to proper value: 1. "high_mode" should be set to "1". 2. "master_code" should be set to "8'b 0000_1xxx"(x is 0 or 1). If no master_code is set, set to default value 0xe. 3. "rate" should be set according to specification. Signed-off-by: Leilei Shang <shangll@marvell.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
/*
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* i2c_pxa.h
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*
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* Copyright (C) 2002 Intrinsyc Software Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef _I2C_PXA_H_
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#define _I2C_PXA_H_
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#if 0
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#define DEF_TIMEOUT 3
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#else
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/* need a longer timeout if we're dealing with the fact we may well be
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* looking at a multi-master environment
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*/
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#define DEF_TIMEOUT 32
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#endif
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#define BUS_ERROR (-EREMOTEIO)
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#define XFER_NAKED (-ECONNREFUSED)
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#define I2C_RETRY (-2000) /* an error has occurred retry transmit */
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/* ICR initialize bit values
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*
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* 15. FM 0 (100 Khz operation)
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* 14. UR 0 (No unit reset)
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* 13. SADIE 0 (Disables the unit from interrupting on slave addresses
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* matching its slave address)
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* 12. ALDIE 0 (Disables the unit from interrupt when it loses arbitration
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* in master mode)
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* 11. SSDIE 0 (Disables interrupts from a slave stop detected, in slave mode)
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* 10. BEIE 1 (Enable interrupts from detected bus errors, no ACK sent)
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* 9. IRFIE 1 (Enable interrupts from full buffer received)
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* 8. ITEIE 1 (Enables the I2C unit to interrupt when transmit buffer empty)
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* 7. GCD 1 (Disables i2c unit response to general call messages as a slave)
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* 6. IUE 0 (Disable unit until we change settings)
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* 5. SCLE 1 (Enables the i2c clock output for master mode (drives SCL)
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* 4. MA 0 (Only send stop with the ICR stop bit)
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* 3. TB 0 (We are not transmitting a byte initially)
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* 2. ACKNAK 0 (Send an ACK after the unit receives a byte)
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* 1. STOP 0 (Do not send a STOP)
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* 0. START 0 (Do not send a START)
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*
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*/
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#define I2C_ICR_INIT (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE)
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/* I2C status register init values
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*
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* 10. BED 1 (Clear bus error detected)
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* 9. SAD 1 (Clear slave address detected)
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* 7. IRF 1 (Clear IDBR Receive Full)
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* 6. ITE 1 (Clear IDBR Transmit Empty)
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* 5. ALD 1 (Clear Arbitration Loss Detected)
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* 4. SSD 1 (Clear Slave Stop Detected)
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*/
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#define I2C_ISR_INIT 0x7FF /* status register init */
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struct i2c_slave_client;
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struct i2c_pxa_platform_data {
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unsigned int slave_addr;
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struct i2c_slave_client *slave;
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unsigned int class;
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unsigned int use_pio :1;
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unsigned int fast_mode :1;
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unsigned int high_mode:1;
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unsigned char master_code;
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unsigned long rate;
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};
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extern void pxa_set_i2c_info(struct i2c_pxa_platform_data *info);
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#ifdef CONFIG_PXA27x
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extern void pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data *info);
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#endif
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#ifdef CONFIG_PXA3xx
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extern void pxa3xx_set_i2c_power_info(struct i2c_pxa_platform_data *info);
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#endif
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#endif
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