[U-Boot] [PATCH V2] fsl: esdhc: support driver model

[Peng Fan <van.freenix@gmail.com>]

Hi York,

On Tue, Mar 22, 2016 at 07:26:08PM +0000, york sun wrote:
>On 03/15/2016 03:23 AM, Peng Fan wrote:
>> Support Driver Model for fsl esdhc driver.
>> 
>> 1. Introduce a new structure struct fsl_esdhc_priv
>> 2. Refactor fsl_esdhc_initialize which is originally used by board code.
>>    - Introduce fsl_esdhc_init to be common usage for DM and non-DM
>>    - Introduce fsl_esdhc_cfg_to_priv to build the bridge for non-DM part.
>>    - The original API for board code is still there, but we use
>>      'fsl_esdhc_cfg_to_priv' and 'fsl_esdhc_init' to serve it.
>> 3. All the functions are changed to use 'struct fsl_esdhc_priv', except
>>    fsl_esdhc_initialize.
>> 4. Since clk driver is not implemented, use mxc_get_clock to geth
>>    the clk and fill 'priv->sdhc_clk'.
>> 
>> Has been tested on i.MX6UL 14X14 EVK board:
>> "
>> =>dm tree
>> ....
>>  simple_bus  [ + ]    |   `-- aips-bus at 02100000
>>   mmc        [ + ]    |       |-- usdhc at 02190000
>>   mmc        [ + ]    |       |-- usdhc at 02194000
>> ....
>> => mmc list
>> FSL_SDHC: 0 (SD)
>> FSL_SDHC: 1 (SD)
>> "
>> 
>> Signed-off-by: Peng Fan <van.freenix@gmail.com>
>> Cc: York Sun <york.sun@nxp.com>
>> Cc: Yangbo Lu <yangbo.lu@nxp.com>
>> Cc: Hector Palacios <hector.palacios@digi.com>
>> Cc: Eric Nelson <eric@nelint.com>
>> Cc: Stefano Babic <sbabic@denx.de>
>> Cc: Fabio Estevam <fabio.estevam@nxp.com>
>> Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
>> Cc: Simon Glass <sjg@chromium.org>
>> ---
>> 
>> V2:
>>  restructure the V1 patch.
>>  Introduce fsl_esdhc_priv structure.
>>  Introduce code to handle cd-gpios and non-removable.
>> 
>>  drivers/mmc/fsl_esdhc.c | 253 ++++++++++++++++++++++++++++++++++++++++--------
>>  1 file changed, 213 insertions(+), 40 deletions(-)
>> 
>> diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
>> index ea5f4bf..6fadde1 100644
>> --- a/drivers/mmc/fsl_esdhc.c
>> +++ b/drivers/mmc/fsl_esdhc.c
>> @@ -20,6 +20,9 @@
>
><snip>
>
>> +static int fsl_esdhc_probe(struct udevice *dev)
>> +{
>> +	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
>> +	struct fsl_esdhc_priv *priv = dev_get_priv(dev);
>> +	const void *fdt = gd->fdt_blob;
>> +	int node = dev->of_offset;
>> +	fdt_addr_t addr;
>> +	unsigned int val;
>> +	int ret;
>> +
>> +	addr = dev_get_addr(dev);
>> +	if (addr == FDT_ADDR_T_NONE)
>> +		return -EINVAL;
>> +
>> +	priv->esdhc_base = (phys_addr_t)addr;
>> +	priv->dev = dev;
>> +
>> +	val = fdtdec_get_int(fdt, node, "bus-width", -1);
>> +	if (val == 8)
>> +		priv->bus_width = 8;
>> +	else if (val == 4)
>> +		priv->bus_width = 4;
>> +	else
>> +		priv->bus_width = 1;
>> +
>> +	if (fdt_get_property(fdt, node, "non-removable", NULL)) {
>> +		priv->non_removable = 1;
>> +	 } else {
>> +		priv->non_removable = 0;
>> +		gpio_request_by_name_nodev(fdt, node, "cd-gpios", 0,
>> +					   &priv->cd_gpio, GPIOD_IS_IN);
>> +	}
>> +
>> +	/*
>> +	 * TODO:
>> +	 * Because lack of clk driver, if SDHC clk is not enabled,
>> +	 * need to enable it first before this driver is invoked.
>> +	 *
>> +	 * we use MXC_ESDHC_CLK to get clk freq.
>> +	 * If one would like to make this function work,
>> +	 * the aliases should be provided in dts as this:
>> +	 *
>> +	 *  aliases {
>> +	 *	mmc0 = &usdhc1;
>> +	 *	mmc1 = &usdhc2;
>> +	 *	mmc2 = &usdhc3;
>> +	 *	mmc3 = &usdhc4;
>> +	 *	};
>> +	 * Then if your board only supports mmc2 and mmc3, but we can
>> +	 * correctly get the seq as 2 and 3, then let mxc_get_clock
>> +	 * work as expected.
>> +	 */
>> +	priv->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK + dev->seq);
>
>Peng,
>
>This seems to be problematic on powerpc platforms. Have you tested (at least
>compiled) for any of them (eg. T2080, T4240, P1022, MPC8536, etc.)?

I only test the patch on i.MX platform with DM and non_DM option.

I have no ppc compilers, Could you tell me where to download the powerpc compiler
for the platform you listed?

Thanks,
Peng.

>
>York
>