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>

diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index e013117a404d197be43953fe3f7406db9727c77a..d2407558773f37f4f651f23e5dfce5c9536869d9 100644 (file)
--- 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;
 }