[PATCH 3/4] ARM: AM33XX: board-generic: Add of_dev_auxdata to pass d_can raminit

[Marc Kleine-Budde]

On 09/03/2012 01:52 PM, AnilKumar Ch wrote:
> Add of_dev_auxdata to pass d_can raminit callback APIs to initialize
> d_can RAM. D_CAN RAM initialization bits are present in CONTROL module
> address space, which can be accessed by platform specific code. So
> callback functions are added to serve this purpose, this can done by
> using of_dev_auxdata.
> 
> Callback API is added to of_dev_auxdata with different instance numbers
> for two instances of D_CAN IP. These callback functions are used to
> enable/disable D_CAN RAM from CAN driver.
> 
> Signed-off-by: AnilKumar Ch <anilkumar at ti.com>

This will be a more complicated. This patch will go over the arm tree,
but needs a header going via net.

Marc

> ---
>  arch/arm/mach-omap2/board-generic.c |   40 ++++++++++++++++++++++++++++++++++-
>  arch/arm/mach-omap2/control.h       |    4 ++++
>  2 files changed, 43 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
> index 6f93a20..b68e642 100644
> --- a/arch/arm/mach-omap2/board-generic.c
> +++ b/arch/arm/mach-omap2/board-generic.c
> @@ -15,6 +15,7 @@
>  #include <linux/of_irq.h>
>  #include <linux/of_platform.h>
>  #include <linux/irqdomain.h>
> +#include <linux/can/platform/c_can.h>
>  
>  #include <mach/hardware.h>
>  #include <asm/hardware/gic.h>
> @@ -22,6 +23,8 @@
>  
>  #include <plat/board.h>
>  #include "common.h"
> +#include "control.h"
> +#include "iomap.h"
>  #include "common-board-devices.h"
>  
>  #if !(defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3))
> @@ -37,11 +40,46 @@ static struct of_device_id omap_dt_match_table[] __initdata = {
>  	{ }
>  };
>  
> +void d_can_hw_raminit(unsigned int instance, bool enable)
> +{
> +	u32 val;
> +
> +	val = readl(AM33XX_CTRL_REGADDR(AM33XX_CONTROL_DCAN_RAMINIT));
> +	if (enable) {
> +		val &= ~AM33XX_DCAN_RAMINIT_START_MASK(instance);
> +		val |= AM33XX_DCAN_RAMINIT_START_MASK(instance);
> +		writel(val, AM33XX_CTRL_REGADDR(AM33XX_CONTROL_DCAN_RAMINIT));
> +	} else {
> +		val &= ~AM33XX_DCAN_RAMINIT_START_MASK(instance);
> +		writel(val, AM33XX_CTRL_REGADDR(AM33XX_CONTROL_DCAN_RAMINIT));
> +	}
> +}
> +
> +static struct c_can_platform_data d_can0_pdata = {
> +	.ram_init	= d_can_hw_raminit,
> +	.instance	= 0,
> +};
> +
> +static struct c_can_platform_data d_can1_pdata = {
> +	.ram_init	= d_can_hw_raminit,
> +	.instance	= 1,
> +};
> +
> +static const struct of_dev_auxdata am33xx_auxdata_lookup[] __initconst = {
> +	OF_DEV_AUXDATA("bosch,d_can", 0x481cc000, NULL, &d_can0_pdata),
> +	OF_DEV_AUXDATA("bosch,d_can", 0x481d0000, NULL, &d_can1_pdata),
> +	{ },
> +};
> +
>  static void __init omap_generic_init(void)
>  {
>  	omap_sdrc_init(NULL, NULL);
>  
> -	of_platform_populate(NULL, omap_dt_match_table, NULL, NULL);
> +	if (of_machine_is_compatible("ti,am33xx"))
> +		of_platform_populate(NULL, omap_dt_match_table,
> +				am33xx_auxdata_lookup, NULL);
> +	else
> +		of_platform_populate(NULL, omap_dt_match_table, NULL, NULL);
>  }
>  
>  #ifdef CONFIG_SOC_OMAP2420
> diff --git a/arch/arm/mach-omap2/control.h b/arch/arm/mach-omap2/control.h
> index b8cdc85..afd189b 100644
> --- a/arch/arm/mach-omap2/control.h
> +++ b/arch/arm/mach-omap2/control.h
> @@ -356,6 +356,10 @@
>  #define AM33XX_CONTROL_STATUS_SYSBOOT1_SHIFT		22
>  #define AM33XX_CONTROL_STATUS_SYSBOOT1_MASK		(0x3 << 22)
>  
> +/* AM33XX DCAN bitfields */
> +#define AM33XX_CONTROL_DCAN_RAMINIT		0x644
> +#define AM33XX_DCAN_RAMINIT_START_MASK(i)	(1 << (i))
> +
>  /* CONTROL OMAP STATUS register to identify OMAP3 features */
>  #define OMAP3_CONTROL_OMAP_STATUS	0x044c
>  
> 


-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |

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