On 11/21/2012 06:44 AM, AnilKumar Ch wrote:
> Add D_CAN raminit support to C_CAN driver to enable D_CAN RAM,
> which holds all the message objects during transmission or
> receiving of data. This initialization/de-initialization should
> be done in synchronous with D_CAN clock.
>
> In case of AM335X-EVM (current user of D_CAN driver) message RAM is
> controlled through control module register for both instances. So
> control module register details is required to initialization or
> de-initialization of message RAM according to instance number.
>
> Control module memory resource is obtained from D_CAN dt node and
> instance number obtained from device tree aliases node.
>
> This patch was tested on AM335x-EVM along with pinctrl data addition
> patch, d_can dt aliases addition and control module data addition.
> pinctrl data addition is not added to am335x-evm.dts (only supports
> CPLD profile#0) because d_can1 is supported under CPLD profile#1.
>
> Signed-off-by: AnilKumar Ch <anilkumar@xxxxxx>
> ---
[...]
> @@ -178,6 +195,20 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev)
> priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
> priv->read_reg = c_can_plat_read_reg_aligned_to_16bit;
> priv->write_reg = c_can_plat_write_reg_aligned_to_16bit;
> +
> + if (pdev->dev.of_node)
> + priv->instance = pdev->id < 0 ?
> + of_alias_get_id(pdev->dev.of_node, "d_can") :
> + pdev->id;
This wouldn't work with non DT kernels, what about:
if (pdev->dev.of_node)
priv->instance = of_alias_get_id(pdev->dev.of_node, "d_can");
else
priv->instance = pdev->id;
Marc
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + priv->raminit_ctrlreg =
> + devm_request_and_ioremap(&pdev->dev, res);
> + if (!priv->raminit_ctrlreg || priv->instance < 0) {
> + dev_info(&pdev->dev, "control memory is not used for raminit\n");
> + break;
> + }
> + priv->ram_init = c_can_hw_raminit;
> break;
> default:
> ret = -EINVAL;
>
--
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