[U-Boot] PATCH 3/8 Multi-adapter multi-bus I2C

[Heiko Schocher <hs@denx.de>]

Hello ksi,

ksi at koi8.net wrote:
> Signed-off-by: Sergey Kubushyn <ksi@koi8.net>      
> ---
> diff --git a/drivers/i2c/soft_i2c.c b/drivers/i2c/soft_i2c.c
> index da6cec1..f0c1771 100644
> --- a/drivers/i2c/soft_i2c.c
> +++ b/drivers/i2c/soft_i2c.c
> @@ -1,4 +1,8 @@
>  /*
> + * Copyright (c) 2009 Sergey Kubushyn <ksi@koi8.net>
> + *
> + * Changes for multibus/multiadapter I2C support.
> + *
>   * (C) Copyright 2001, 2002
>   * Wolfgang Denk, DENX Software Engineering, wd at denx.de.
>   *
> @@ -72,375 +76,493 @@ DECLARE_GLOBAL_DATA_PTR;
>  #define PRINTD(fmt,args...)
>  #endif
>  
> -#if defined(CONFIG_I2C_MULTI_BUS)
> -static unsigned int i2c_bus_num __attribute__ ((section (".data"))) = 0;
> -#endif /* CONFIG_I2C_MULTI_BUS */
> -
>  /*-----------------------------------------------------------------------
>   * Local functions
>   */
> -#if !defined(CONFIG_SYS_I2C_INIT_BOARD)
> -static void  send_reset	(void);
> +#ifndef I2C_INIT
> +#define I2C_INIT	do {} while(0)
>  #endif
> -static void  send_start	(void);
> -static void  send_stop	(void);
> -static void  send_ack	(int);
> -static int   write_byte	(uchar byte);
> -static uchar read_byte	(int);
> -
> -#if !defined(CONFIG_SYS_I2C_INIT_BOARD)
> -/*-----------------------------------------------------------------------
> - * Send a reset sequence consisting of 9 clocks with the data signal high
> - * to clock any confused device back into an idle state.  Also send a
> - * <stop> at the end of the sequence for belts & suspenders.
> - */
> -static void send_reset(void)
> -{
> -	I2C_SOFT_DECLARATIONS	/* intentional without ';' */
> -	int j;
> -
> -	I2C_SCL(1);
> -	I2C_SDA(1);
> -#ifdef	I2C_INIT
> -	I2C_INIT;
> +#ifndef I2C_INIT0
> +#define I2C_INIT0	do {} while(0)
>  #endif
> -	I2C_TRISTATE;
> -	for(j = 0; j < 9; j++) {
> -		I2C_SCL(0);
> -		I2C_DELAY;
> -		I2C_DELAY;
> -		I2C_SCL(1);
> -		I2C_DELAY;
> -		I2C_DELAY;
> -	}
> -	send_stop();
> -	I2C_TRISTATE;
> -}
> +#ifndef I2C_INIT1
> +#define I2C_INIT1	do {} while(0)
> +#endif
> +#ifndef I2C_INIT2
> +#define I2C_INIT2	do {} while(0)
>  #endif
> +#ifndef I2C_INIT3
> +#define I2C_INIT3	do {} while(0)
> +#endif
> +
>  
>  /*-----------------------------------------------------------------------
>   * START: High -> Low on SDA while SCL is High
>   */
> -static void send_start(void)
> -{
> -	I2C_SOFT_DECLARATIONS	/* intentional without ';' */
> -
> -	I2C_DELAY;
> -	I2C_SDA(1);
> -	I2C_ACTIVE;
> -	I2C_DELAY;
> -	I2C_SCL(1);
> -	I2C_DELAY;
> -	I2C_SDA(0);
> -	I2C_DELAY;
> +#define I2C_SOFT_SEND_START(n) \
> +static void send_start##n(void) \
> +{ \
> +	I2C_SOFT_DECLARATIONS##n \
> +	I2C_DELAY##n; \
> +	I2C_SDA##n(1); \
> +	I2C_ACTIVE##n; \
> +	I2C_DELAY##n; \
> +	I2C_SCL##n(1); \
> +	I2C_DELAY##n; \
> +	I2C_SDA##n(0); \
> +	I2C_DELAY##n; \
>  }
>   
[...]
> -	PRINTD("i2c_read: fix addr_overflow: chip %02X addr %02X\n",
> -		chip, addr);
> -#endif
> +#define	DO_EEAD_OVF	chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); \
>   

Line too long.

> +			PRINTD("%s: fix addr_overflow: chip %02X addr %02X\n", \
> +				__FUNCTION__, chip, addr);
>  
> -	/*
> -	 * Do the addressing portion of a write cycle to set the
> -	 * chip's address pointer.  If the address length is zero,
> -	 * don't do the normal write cycle to set the address pointer,
> -	 * there is no address pointer in this chip.
>   
[...]
> +#if defined(I2C_SOFT_DECLARATIONS3)
> +I2C_SOFT_SEND_START(3)
> +I2C_SOFT_SEND_STOP(3)
> +I2C_SOFT_SEND_ACK(3)
> +#if !defined(CONFIG_SYS_I2C_INIT_BOARD)
> +I2C_SOFT_SEND_RESET(3)
> +#endif
> +I2C_SOFT_WRITE_BYTE(3)
> +I2C_SOFT_READ_BYTE(3)
> +I2C_SOFT_INIT_ADAPTER(3)
> +I2C_SOFT_PROBE(3)
> +I2C_SOFT_READ(3)
> +I2C_SOFT_WRITE(3)
> +I2C_SOFT_GET_BUS_SPEED(3)
> +I2C_SOFT_SET_BUS_SPEED(3)
> +#endif
> +
>   

Hmm... are this lots of defines really necessary? Couldn't we add
something like

int    hw_adapnr; /* hardware adapter number */

to the i2c_adap_t struct, and have an pointer (cur_i2c_adap?) to the
current used i2c_adap_t? Then you have where you need it, your
hw_adapnr and need not all of this defines.

For example you need in the config for MPC8548CDS.h just this define:

#define I2C_SDA(bit)	(printf("HW adap: %d sda: %d", cur_i2c_adap->hw_adapnr, bit))

and not  I2C_SDA(bit) and I2C_SDA1(bit)

> +i2c_adap_t	soft_i2c_adap[] = {
> +	{
> +#if defined(I2C_SOFT_DECLARATIONS)
> +		.init		=	soft_i2c_init,
> +		.probe		=	soft_i2c_probe,
> +		.read		=	soft_i2c_read,
> +		.write		=	soft_i2c_write,
> +		.set_bus_speed	=	soft_i2c_set_bus_speed,
> +		.get_bus_speed	=	soft_i2c_get_bus_speed,
> +		.speed		=	CONFIG_SYS_SOFT_I2C_SPEED,
> +		.slaveaddr	=	CONFIG_SYS_SOFT_I2C_SLAVE,
> +		.init_done	=	0,
> +		.name		=	"soft-i2c"
> +#elif defined(I2C_SOFT_DECLARATIONS0)
> +		.init		=	soft_i2c_init0,
> +		.probe		=	soft_i2c_probe0,
> +		.read		=	soft_i2c_read0,
> +		.write		=	soft_i2c_write0,
> +		.set_bus_speed	=	soft_i2c_set_bus_speed0,
> +		.get_bus_speed	=	soft_i2c_get_bus_speed0,
> +		.speed		=	CONFIG_SYS_SOFT_I2C0_SPEED,
> +		.slaveaddr	=	CONFIG_SYS_SOFT_I2C0_SLAVE,
> +		.init_done	=	0,
> +		.name		=	"soft-i2c#0"
> +#endif
> +	},
> +#if defined(I2C_SOFT_DECLARATIONS1)
> +	{
> +		.init		=	soft_i2c_init1,
> +		.probe		=	soft_i2c_probe1,
> +		.read		=	soft_i2c_read1,
> +		.write		=	soft_i2c_write1,
> +		.set_bus_speed	=	soft_i2c_set_bus_speed1,
> +		.get_bus_speed	=	soft_i2c_get_bus_speed1,
> +		.speed		=	CONFIG_SYS_SOFT_I2C1_SPEED,
> +		.slaveaddr	=	CONFIG_SYS_SOFT_I2C1_SLAVE,
> +		.init_done	=	0,
> +		.name		=	"soft-i2c#1"
> +	},
> +#endif
> +#if defined(I2C_SOFT_DECLARATIONS2)
> +	{
> +		.init		=	soft_i2c_init2,
> +		.probe		=	soft_i2c_probe2,
> +		.read		=	soft_i2c_read2,
> +		.write		=	soft_i2c_write2,
> +		.set_bus_speed	=	soft_i2c_set_bus_speed2,
> +		.get_bus_speed	=	soft_i2c_get_bus_speed2,
> +		.speed		=	CONFIG_SYS_SOFT_I2C2_SPEED,
> +		.slaveaddr	=	CONFIG_SYS_SOFT_I2C2_SLAVE,
> +		.init_done	=	0,
> +		.name		=	"soft-i2c#2"
> +	},
> +#endif
> +#if defined(I2C_SOFT_DECLARATIONS3)
> +	{
> +		.init		=	soft_i2c_init3,
> +		.probe		=	soft_i2c_probe3,
> +		.read		=	soft_i2c_read3,
> +		.write		=	soft_i2c_write3,
> +		.set_bus_speed	=	soft_i2c_set_bus_speed3,
> +		.get_bus_speed	=	soft_i2c_get_bus_speed3,
> +		.speed		=	CONFIG_SYS_SOFT_I2C3_SPEED,
> +		.slaveaddr	=	CONFIG_SYS_SOFT_I2C3_SLAVE,
> +		.init_done	=	0,
> +		.name		=	"soft-i2c#3"
> +	},
> +#endif
> +};
>   

bye
Heiko

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