[U-Boot] [PATCH 1/2] i2c: move to new subsystem

[Heiko Schocher <hs@denx.de>]

Hello Philippe,

added stefano babic, as he is the imx custodian, to cc

Am 15.09.2013 21:09, schrieb Philippe Reynes:
> Signed-off-by: Philippe Reynes<tremyfr@yahoo.fr>
> ---
>   README                         |    3 +
>   arch/arm/cpu/armv7/mx5/clock.c |    2 +-
>   arch/arm/cpu/armv7/mx6/clock.c |    2 +-
>   arch/arm/imx-common/Makefile   |    2 +-
>   drivers/i2c/Makefile           |    2 +-
>   drivers/i2c/mxc_i2c.c          |  109 ++++++++++++++++++---------------------
>   6 files changed, 57 insertions(+), 63 deletions(-)

First, thanks for this work!

Could you please change your subject in something like

"i2c, mxc: switch to new multibus/multiadapter framework" ?

> diff --git a/README b/README
> index 63706be..7c734ba 100644
> --- a/README
> +++ b/README
> @@ -1995,6 +1995,9 @@ CBFS (Coreboot Filesystem) support
>   		  - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
>   		  - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
>
> +		- drivers/i2c/i2c_mxc.c
> +		 - activate this driver with CONFIG_SYS_I2C_MXC
> +

You should use some new defines for the speed setting ... did you?
If not please add them, thanks.

>   		additional defines:
>
>   		CONFIG_SYS_NUM_I2C_BUSES
[...]
> diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
> index 37ccbd1..f9fcebe 100644
> --- a/drivers/i2c/Makefile
> +++ b/drivers/i2c/Makefile
> @@ -14,7 +14,7 @@ COBJS-$(CONFIG_DRIVER_DAVINCI_I2C) += davinci_i2c.o
>   COBJS-$(CONFIG_DW_I2C) += designware_i2c.o
>   COBJS-$(CONFIG_I2C_MVTWSI) += mvtwsi.o
>   COBJS-$(CONFIG_I2C_MV) += mv_i2c.o
> -COBJS-$(CONFIG_I2C_MXC) += mxc_i2c.o
> +COBJS-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o

Please keep this list sorted.

>   COBJS-$(CONFIG_I2C_MXS) += mxs_i2c.o
>   COBJS-$(CONFIG_DRIVER_OMAP1510_I2C) += omap1510_i2c.o
>   COBJS-$(CONFIG_DRIVER_OMAP24XX_I2C) += omap24xx_i2c.o
> diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
> index 06ba4e3..3ac1865 100644
> --- a/drivers/i2c/mxc_i2c.c
> +++ b/drivers/i2c/mxc_i2c.c
> @@ -153,21 +153,6 @@ static int bus_i2c_set_bus_speed(void *base, int speed)
>   	return 0;
>   }
>
> -/*
> - * Get I2C Speed
> - */
> -static unsigned int bus_i2c_get_bus_speed(void *base)
> -{
> -	struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base;
> -	u8 clk_idx = readb(&i2c_regs->ifdr);
> -	u8 clk_div;
> -
> -	for (clk_div = 0; i2c_clk_div[clk_div][1] != clk_idx; clk_div++)
> -		;
> -
> -	return mxc_get_clock(MXC_I2C_CLK) / i2c_clk_div[clk_div][0];
> -}
> -
>   #define ST_BUS_IDLE (0 | (I2SR_IBB<<  8))
>   #define ST_BUS_BUSY (I2SR_IBB | (I2SR_IBB<<  8))
>   #define ST_IIF (I2SR_IIF | (I2SR_IIF<<  8))
> @@ -410,20 +395,30 @@ struct sram_data {
>    */
>   static struct sram_data __attribute__((section(".data"))) srdata;
>
> -void *get_base(void)
> -{
> -#ifdef CONFIG_SYS_I2C_BASE
> -#ifdef CONFIG_I2C_MULTI_BUS
> -	void *ret = srdata.i2c_data[srdata.curr_i2c_bus].base;
> -	if (ret)
> -		return ret;
> -#endif
> -	return (void *)CONFIG_SYS_I2C_BASE;
> -#elif defined(CONFIG_I2C_MULTI_BUS)
> -	return srdata.i2c_data[srdata.curr_i2c_bus].base;
> +static void * const i2c_bases[] = {
> +#if defined(CONFIG_MX25)
> +	(void *)IMX_I2C_BASE,
> +	(void *)IMX_I2C2_BASE,
> +	(void *)IMX_I2C3_BASE
> +#elif defined(CONFIG_MX27)
> +	(void *)IMX_I2C1_BASE,
> +	(void *)IMX_I2C2_BASE
> +#elif defined(CONFIG_MX31) || defined(CONFIG_MX35) || \
> +	defined(CONFIG_MX51) || defined(CONFIG_MX53) ||	\
> +	defined(CONFIG_MX6)
> +	(void *)I2C1_BASE_ADDR,
> +	(void *)I2C2_BASE_ADDR,
> +	(void *)I2C3_BASE_ADDR
> +#elif defined(CONFIG_VF610)
> +	(void *)I2C0_BASE_ADDR
>   #else
> -	return srdata.i2c_data[0].base;
> +#error "architecture not supported"
>   #endif
> +};
> +
> +void *i2c_get_base(struct i2c_adapter *adap)
> +{
> +	return i2c_bases[adap->hwadapnr];
>   }
>
>   static struct i2c_parms *i2c_get_parms(void *base)
> @@ -448,39 +443,26 @@ static int i2c_idle_bus(void *base)
>   	return 0;
>   }
>
> -#ifdef CONFIG_I2C_MULTI_BUS
> -unsigned int i2c_get_bus_num(void)
> +int mxc_i2c_read(struct i2c_adapter *adap, uint8_t chip,

static now

> +				uint addr, int alen, uint8_t *buffer,
> +				int len)
>   {
> -	return srdata.curr_i2c_bus;
> +	return bus_i2c_read(i2c_get_base(adap), chip, addr, alen, buffer, len);
>   }
>
> -int i2c_set_bus_num(unsigned bus_idx)
> -{
> -	if (bus_idx>= ARRAY_SIZE(srdata.i2c_data))
> -		return -1;
> -	if (!srdata.i2c_data[bus_idx].base)
> -		return -1;
> -	srdata.curr_i2c_bus = bus_idx;
> -	return 0;
> -}
> -#endif
> -
> -int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
> +int mxc_i2c_write(struct i2c_adapter *adap, uint8_t chip,

static now

> +				uint addr, int alen, uint8_t *buffer,
> +				int len)
>   {
> -	return bus_i2c_read(get_base(), chip, addr, alen, buf, len);
> -}
> -
> -int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
> -{
> -	return bus_i2c_write(get_base(), chip, addr, alen, buf, len);
> +	return bus_i2c_write(i2c_get_base(adap), chip, addr, alen, buffer, len);
>   }
>
>   /*
>    * Test if a chip at a given address responds (probe the chip)
>    */
> -int i2c_probe(uchar chip)
> +int mxc_i2c_probe(struct i2c_adapter *adap, uint8_t chip)

static now

>   {
> -	return bus_i2c_write(get_base(), chip, 0, 0, NULL, 0);
> +	return bus_i2c_write(i2c_get_base(adap), chip, 0, 0, NULL, 0);
>   }
>
>   void bus_i2c_init(void *base, int speed, int unused,
> @@ -510,23 +492,32 @@ void bus_i2c_init(void *base, int speed, int unused,
>   /*
>    * Init I2C Bus
>    */
> -void i2c_init(int speed, int unused)
> +void mxc_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)

static now

>   {
> -	bus_i2c_init(get_base(), speed, unused, NULL, NULL);
> +	bus_i2c_init(i2c_get_base(adap), speed, slaveaddr, NULL, NULL);
>   }
>
>   /*
>    * Set I2C Speed
>    */
> -int i2c_set_bus_speed(unsigned int speed)
> +uint mxc_i2c_set_bus_speed(struct i2c_adapter *adap, uint speed)

static now

>   {
> -	return bus_i2c_set_bus_speed(get_base(), speed);
> +	return bus_i2c_set_bus_speed(i2c_get_base(adap), speed);
>   }
>
>   /*
> - * Get I2C Speed
> + * Register mxc i2c adapters
>    */
> -unsigned int i2c_get_bus_speed(void)
> -{
> -	return bus_i2c_get_bus_speed(get_base());
> -}
> +U_BOOT_I2C_ADAP_COMPLETE(mxc0, mxc_i2c_init, mxc_i2c_probe,
> +			 mxc_i2c_read, mxc_i2c_write,
> +			 mxc_i2c_set_bus_speed, 100000, 0, 0)
                                                 ^
shouldn;t we do this here configurable? Or is the speed and slave
setting for all imx boards the same?

> +U_BOOT_I2C_ADAP_COMPLETE(mxc1, mxc_i2c_init, mxc_i2c_probe,
> +			 mxc_i2c_read, mxc_i2c_write,
> +			 mxc_i2c_set_bus_speed, 100000, 0, 1)
> +#if defined(CONFIG_MX31) || defined(CONFIG_MX35) ||\
> +	defined(CONFIG_MX51) || defined(CONFIG_MX53) ||\
> +	defined(CONFIG_MX6)
> +U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe,
> +			 mxc_i2c_read, mxc_i2c_write,
> +			 mxc_i2c_set_bus_speed, 100000, 0, 2)
> +#endif

bye,
Heiko
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