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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>
This commit is contained in:
Semen Protsenko 2015-01-24 22:28:38 +02:00 committed by Roger Quadros
parent c517d838eb
commit 9c4f757ee9
1 changed files with 16 additions and 4 deletions
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20
drivers/memory/omap-gpmc.c
View File

@ -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);