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spi/fsl_spi: fix CPM spi driver 

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 <holger.brunck@keymile.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Holger Brunck 2011-06-20 18:31:57 +02:00 committed by Grant Likely
parent c25ded1fbc
commit fb6440955f
1 changed files with 11 additions and 17 deletions
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28
drivers/spi/spi-fsl-spi.c
View File

@ -684,7 +684,7 @@ static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
struct device_node *np = dev->of_node; struct device_node *np = dev->of_node;
const u32 *iprop; const u32 *iprop;
int size; int size;
unsigned long spi_base_ofs; void __iomem *spi_base;
unsigned long pram_ofs = -ENOMEM; unsigned long pram_ofs = -ENOMEM;
/* Can't use of_address_to_resource(), QE muram isn't at 0. */ /* 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; return pram_ofs;
} }
/* CPM1 and CPM2 pram must be at a fixed addr. */ spi_base = of_iomap(np, 1);
if (!iprop || size != sizeof(*iprop) * 4) if (spi_base == NULL)
return -ENOMEM; return -EINVAL;
spi_base_ofs = cpm_muram_alloc_fixed(iprop[2], 2);
if (IS_ERR_VALUE(spi_base_ofs))
return -ENOMEM;
if (mspi->flags & SPI_CPM2) { if (mspi->flags & SPI_CPM2) {
pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
if (!IS_ERR_VALUE(pram_ofs)) { out_be16(spi_base, pram_ofs);
u16 __iomem *spi_base = cpm_muram_addr(spi_base_ofs);
out_be16(spi_base, pram_ofs);
}
} else { } 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); u16 rpbase = in_be16(&pram->rpbase);
/* Microcode relocation patch applied? */ /* Microcode relocation patch applied? */
if (rpbase) if (rpbase)
pram_ofs = rpbase; pram_ofs = rpbase;
else else {
return spi_base_ofs; 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; return pram_ofs;
} }