linux-kernel - [PATCH 1/2] spi: fsl-spi: Fix parameter ram offset setup for CPM1

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Date:	Fri,  3 Oct 2014 14:56:08 +0200 (CEST)
From:	Christophe Leroy <christophe.leroy@....fr>
To:	Mark Brown <broonie@...nel.org>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Vitaly Bordug <vitb@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-spi@...r.kernel.org,
	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>,
	scottwood@...escale.com
Subject: [PATCH 1/2] spi: fsl-spi: Fix parameter ram offset setup for CPM1

On CPM1, the SPI parameter RAM has a default location. In fsl_spi_cpm_get_pram()
there was a confusion between the SPI_BASE register and the base of the SPI
parameter RAM. Fortunatly, it was working properly with MPC866 and MPC885
because they do set SPI_BASE, but on MPC860 and other old MPC8xx that doesn't
set SPI_BASE, pram_ofs was not properly set. This patch fixes this confusion.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

---
 drivers/spi/spi-fsl-cpm.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-fsl-cpm.c b/drivers/spi/spi-fsl-cpm.c
index 54b0637..0f3a912 100644
--- a/drivers/spi/spi-fsl-cpm.c
+++ b/drivers/spi/spi-fsl-cpm.c
@@ -262,15 +262,14 @@ static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
 		pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
 		out_be16(spi_base, pram_ofs);
 	} else {
-		struct spi_pram __iomem *pram = spi_base;
-		u16 rpbase = in_be16(&pram->rpbase);
+		u16 rpbase = in_be16(spi_base);
 
-		/* Microcode relocation patch applied? */
+		/* Microcode relocation patch applied | rpbase set by default */
 		if (rpbase) {
 			pram_ofs = rpbase;
 		} else {
-			pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
-			out_be16(spi_base, pram_ofs);
+			pram_ofs = offsetof(cpm8xx_t, cp_dparam[PROFF_SPI]) -
+				   offsetof(cpm8xx_t, cp_dpmem[0]);
 		}
 	}
 
-- 
2.1.0

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