Subject: Re: [PATCH] spi/fsl_spi: fix CPM spi driver

From: Holger Brunck <[email-masked]>
Date: Tue, 05 Jul 2011 16:31:50 +0200

Hi Grant,
is this patch in your eyes ok to be scheduled for the next linux merge window or
is something missing? Or should it go through the powerpc tree and not through
your spi tree?

Please let me know your opinion.

Best regards
Holger Brunck

On 06/20/2011 06:31 PM, Holger Brunck wrote:
> This patch fixes the freescale spi driver for CPM. Without this
> patch SPI on CPM failed because cpm_muram_alloc_fixed tries to
> allocate muram in an preserved area. The error reported was:
> 
> mpc8xxx_spi f0011a80.spi: can't allocate spi parameter ram
> mpc8xxx_spi: probe of f0011a80.spi failed with error -12
> 
> Now the driver uses of_iomap to get access to this area
> similar to i2c driver driver in the i2c-cpm.c which has a
> similar device tree node. This is tested on a MPC8247 with CPM2.
> 
> Signed-off-by: Holger Brunck <[email-masked]>
> cc: Grant Likely <[email-masked]>
> cc: [email-masked]
> ---
> This was the same problem reported and discussed on ppc-dev for CPM1:
> http://lists.ozlabs.org/pipermail/linuxppc-dev/2010-September/085739.html
> 
>  drivers/spi/spi_fsl_spi.c |   28 +++++++++++-----------------
>  1 files changed, 11 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/spi/spi_fsl_spi.c b/drivers/spi/spi_fsl_spi.c
> index 7963c9b..ca57edf 100644
> --- a/drivers/spi/spi_fsl_spi.c
> +++ b/drivers/spi/spi_fsl_spi.c
> @@ -684,7 +684,7 @@ static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
>  	struct device_node *np = dev->of_node;
>  	const u32 *iprop;
>  	int size;
> -	unsigned long spi_base_ofs;
> +	void __iomem *spi_base;
>  	unsigned long pram_ofs = -ENOMEM;
>  
>  	/* Can't use of_address_to_resource(), QE muram isn't at 0. */
> @@ -702,33 +702,27 @@ static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
>  		return pram_ofs;
>  	}
>  
> -	/* CPM1 and CPM2 pram must be at a fixed addr. */
> -	if (!iprop || size != sizeof(*iprop) * 4)
> -		return -ENOMEM;
> -
> -	spi_base_ofs = cpm_muram_alloc_fixed(iprop[2], 2);
> -	if (IS_ERR_VALUE(spi_base_ofs))
> -		return -ENOMEM;
> +	spi_base = of_iomap(np, 1);
> +	if (spi_base == NULL)
> +		return -EINVAL;
>  
>  	if (mspi->flags & SPI_CPM2) {
>  		pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
> -		if (!IS_ERR_VALUE(pram_ofs)) {
> -			u16 __iomem *spi_base = cpm_muram_addr(spi_base_ofs);
> -
> -			out_be16(spi_base, pram_ofs);
> -		}
> +		out_be16(spi_base, pram_ofs);
>  	} else {
> -		struct spi_pram __iomem *pram = cpm_muram_addr(spi_base_ofs);
> +		struct spi_pram __iomem *pram = spi_base;
>  		u16 rpbase = in_be16(&pram->rpbase);
>  
>  		/* Microcode relocation patch applied? */
>  		if (rpbase)
>  			pram_ofs = rpbase;
> -		else
> -			return spi_base_ofs;
> +		else {
> +			pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
> +			out_be16(spi_base, pram_ofs);
> +		}
>  	}
>  
> -	cpm_muram_free(spi_base_ofs);
> +	iounmap(spi_base);
>  	return pram_ofs;
>  }
>