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authorSemen Protsenko <semen.protsenko@globallogic.com>2015-01-24 23:28:38 +0300
committerRoger Quadros <rogerq@ti.com>2015-02-25 13:47:32 +0300
commit9c4f757ee9c64623efec61672305f87452f68968 (patch)
tree4c8c85adad625fc62fa7f3c0bc420a2c9a78c137 /drivers/memory
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
downloadlinux-9c4f757ee9c64623efec61672305f87452f68968.tar.xz
ARM: OMAP2+: gpmc: Fix writing in gpmc_cs_set_memconf
Some GPMC_CONFIG7 register bits marked as "RESERVED", means they shouldn't be overwritten. A typical approach to handle such bits called "Read-Modify-Write". Writing procedure used in gpmc_cs_set_memconf() utilizes RMW technique, but implemented incorrectly. Due to obvious typo in code read register value is being rewritten by another value, which leads to loss of read RESERVED bits. This patch fixes this. While at it, replace magic numbers with named constants to improve code readability. Signed-off-by: Semen Protsenko <semen.protsenko@globallogic.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Roger Quadros <rogerq@ti.com>
Diffstat (limited to 'drivers/memory')
-rw-r--r--drivers/memory/omap-gpmc.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index 24696f59215b..10eb4ac4d324 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -153,6 +153,15 @@
#define GPMC_CONFIG1_FCLK_DIV4 (GPMC_CONFIG1_FCLK_DIV(3))
#define GPMC_CONFIG7_CSVALID (1 << 6)
+#define GPMC_CONFIG7_BASEADDRESS_MASK 0x3f
+#define GPMC_CONFIG7_CSVALID_MASK BIT(6)
+#define GPMC_CONFIG7_MASKADDRESS_OFFSET 8
+#define GPMC_CONFIG7_MASKADDRESS_MASK (0xf << GPMC_CONFIG7_MASKADDRESS_OFFSET)
+/* All CONFIG7 bits except reserved bits */
+#define GPMC_CONFIG7_MASK (GPMC_CONFIG7_BASEADDRESS_MASK | \
+ GPMC_CONFIG7_CSVALID_MASK | \
+ GPMC_CONFIG7_MASKADDRESS_MASK)
+
#define GPMC_DEVICETYPE_NOR 0
#define GPMC_DEVICETYPE_NAND 2
#define GPMC_CONFIG_WRITEPROTECT 0x00000010
@@ -586,12 +595,15 @@ static int gpmc_cs_set_memconf(int cs, u32 base, u32 size)
if (base & (size - 1))
return -EINVAL;
+ base >>= GPMC_CHUNK_SHIFT;
mask = (1 << GPMC_SECTION_SHIFT) - size;
+ mask >>= GPMC_CHUNK_SHIFT;
+ mask <<= GPMC_CONFIG7_MASKADDRESS_OFFSET;
+
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
- l &= ~0x3f;
- l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
- l &= ~(0x0f << 8);
- l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
+ l &= ~GPMC_CONFIG7_MASK;
+ l |= base & GPMC_CONFIG7_BASEADDRESS_MASK;
+ l |= mask & GPMC_CONFIG7_MASKADDRESS_MASK;
l |= GPMC_CONFIG7_CSVALID;
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);