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imx: add comments and remove unused struct fields

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Add comment block for the imx_ddr_size function and remove the extra unused
fields from struct esd_mmdc_regs which are also not common between IMX53 and
IMX6.

Cc: Stefan Roese <sr@denx.de>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Andy Ng <andreas2025@gmail.com>
Cc: Eric Nelson <eric.nelson@boundarydevices.com>
Cc: Tapani Utriainen <tapani@technexion.com>
Cc: Tom Rini <trini@ti.com>

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Acked-by: Stefano Babic <sbabic@denx.de>
Acked-by: Nikita Kiryanov <nikita@compulab.co.il>
This commit is contained in:
Tim Harvey 2014-06-02 16:13:21 -07:00 committed by Stefano Babic
parent 887717dbb9
commit b07161c321
1 changed files with 7 additions and 9 deletions
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16
arch/arm/imx-common/cpu.c
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@ -58,6 +58,7 @@ char *get_reset_cause(void)
static const unsigned char col_lookup[] = {9, 10, 11, 8, 12, 9, 9, 9};
static const unsigned char bank_lookup[] = {3, 2};
/* these MMDC registers are common to the IMX53 and IMX6 */
struct esd_mmdc_regs {
uint32_t ctl;
uint32_t pdc;
@ -66,15 +67,6 @@ struct esd_mmdc_regs {
uint32_t cfg1;
uint32_t cfg2;
uint32_t misc;
uint32_t scr;
uint32_t ref;
uint32_t rsvd1;
uint32_t rsvd2;
uint32_t rwd;
uint32_t or;
uint32_t mrr;
uint32_t cfg3lp;
uint32_t mr4;
};
#define ESD_MMDC_CTL_GET_ROW(mdctl) ((ctl >> 24) & 7)
@ -83,6 +75,12 @@ struct esd_mmdc_regs {
#define ESD_MMDC_CTL_GET_CS1(mdctl) ((ctl >> 30) & 1)
#define ESD_MMDC_MISC_GET_BANK(mdmisc) ((misc >> 5) & 1)
/*
* imx_ddr_size - return size in bytes of DRAM according MMDC config
* The MMDC MDCTL register holds the number of bits for row, col, and data
* width and the MMDC MDMISC register holds the number of banks. Combine
* all these bits to determine the meme size the MMDC has been configured for
*/
unsigned imx_ddr_size(void)
{
struct esd_mmdc_regs *mem = (struct esd_mmdc_regs *)MEMCTL_BASE;