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omap4: make SDRAM init work for ES1.0 silicon

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SDRAM init was not working on ES1.0 due to a programming
error. A pointer that was passed by value to a function
was set in function emif_get_device_details(), but the effect
wouldn't be seen in the calling function. The issue came
out while testing for ES1.0 because ES1.0 doesn't have any
SDRAM chips connected to CS1

Signed-off-by: Aneesh V <aneesh@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
This commit is contained in:
Aneesh V 2011-09-08 11:05:53 -04:00 committed by Albert ARIBAUD
parent 16dc702f24
commit 025bc4254b
3 changed files with 22 additions and 54 deletions
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47
arch/arm/cpu/armv7/omap4/emif.c
View File

@ -963,10 +963,11 @@ static u8 is_lpddr2_sdram_present(u32 base, u32 cs,
return 1;
}
static struct lpddr2_device_details *get_lpddr2_details(u32 base, u8 cs,
struct lpddr2_device_details *emif_get_device_details(u32 emif_nr, u8 cs,
struct lpddr2_device_details *lpddr2_dev_details)
{
u32 phy;
u32 base = (emif_nr == 1) ? OMAP44XX_EMIF1 : OMAP44XX_EMIF2;
struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
if (!lpddr2_dev_details)
@ -985,40 +986,6 @@ static struct lpddr2_device_details *get_lpddr2_details(u32 base, u8 cs,
return lpddr2_dev_details;
}
void emif_get_device_details(u32 emif_nr,
struct lpddr2_device_details *cs0_device_details,
struct lpddr2_device_details *cs1_device_details)
{
u32 base = (emif_nr == 1) ? OMAP44XX_EMIF1 : OMAP44XX_EMIF2;
if (running_from_sdram()) {
/*
* We can not do automatic discovery running from SDRAM
* Most likely we came here by mistake. Indicate error
* by returning NULL
*/
cs0_device_details = NULL;
cs1_device_details = NULL;
} else {
/*
* Automatically find the device details:
*
* Reset the PHY after each call to get_lpddr2_details().
* If there is nothing connected to a given chip select
* (typically CS1) mode register reads will mess up with
* the PHY state and subsequent initialization won't work.
* PHY reset brings back PHY to a good state.
*/
cs0_device_details =
get_lpddr2_details(base, CS0, cs0_device_details);
emif_reset_phy(base);
cs1_device_details =
get_lpddr2_details(base, CS1, cs1_device_details);
emif_reset_phy(base);
}
}
#endif /* CONFIG_SYS_AUTOMATIC_SDRAM_DETECTION */
static void do_sdram_init(u32 base)
@ -1051,10 +1018,12 @@ static void do_sdram_init(u32 base)
* - Obtained from user otherwise
*/
struct lpddr2_device_details cs0_dev_details, cs1_dev_details;
emif_get_device_details(emif_nr, &cs0_dev_details,
&cs1_dev_details);
dev_details.cs0_device_details = &cs0_dev_details;
dev_details.cs1_device_details = &cs1_dev_details;
emif_reset_phy(base);
dev_details.cs0_device_details = emif_get_device_details(base, CS0,
&cs0_dev_details);
dev_details.cs1_device_details = emif_get_device_details(base, CS1,
&cs1_dev_details);
emif_reset_phy(base);
/* Return if no devices on this EMIF */
if (!dev_details.cs0_device_details &&

24
arch/arm/cpu/armv7/omap4/sdram_elpida.c
View File

@ -141,24 +141,24 @@ static const struct lpddr2_device_details elpida_2G_S4_details = {
.manufacturer = LPDDR2_MANUFACTURER_ELPIDA
};
static void emif_get_device_details_sdp(u32 emif_nr,
struct lpddr2_device_details *cs0_device_details,
struct lpddr2_device_details *cs1_device_details)
struct lpddr2_device_details *emif_get_device_details_sdp(u32 emif_nr, u8 cs,
struct lpddr2_device_details *lpddr2_dev_details)
{
u32 omap_rev = omap_revision();
/* EMIF1 & EMIF2 have identical configuration */
*cs0_device_details = elpida_2G_S4_details;
if (omap_rev == OMAP4430_ES1_0)
cs1_device_details = NULL;
else
*cs1_device_details = elpida_2G_S4_details;
if ((omap_rev == OMAP4430_ES1_0) && (cs == CS1)) {
/* Nothing connected on CS1 for ES1.0 */
return NULL;
} else {
/* In all other cases Elpida 2G device */
*lpddr2_dev_details = elpida_2G_S4_details;
return lpddr2_dev_details;
}
}
void emif_get_device_details(u32 emif_nr,
struct lpddr2_device_details *cs0_device_details,
struct lpddr2_device_details *cs1_device_details)
struct lpddr2_device_details *emif_get_device_details(u32 emif_nr, u8 cs,
struct lpddr2_device_details *lpddr2_dev_details)
__attribute__((weak, alias("emif_get_device_details_sdp")));
#endif /* CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS */

5
arch/arm/include/asm/arch-omap4/emif.h
View File

@ -1029,9 +1029,8 @@ struct emif_regs {
void emif_get_reg_dump(u32 emif_nr, const struct emif_regs **regs);
void emif_get_dmm_regs(const struct dmm_lisa_map_regs **dmm_lisa_regs);
#else
void emif_get_device_details(u32 emif_nr,
struct lpddr2_device_details *cs0_device_details,
struct lpddr2_device_details *cs1_device_details);
struct lpddr2_device_details *emif_get_device_details(u32 emif_nr, u8 cs,
struct lpddr2_device_details *lpddr2_dev_details);
void emif_get_device_timings(u32 emif_nr,
const struct lpddr2_device_timings **cs0_device_timings,
const struct lpddr2_device_timings **cs1_device_timings);