ti816x: Rework DDR initialization sequence
The ti816x/am389x SoC is the first generation in what U-Boot calls the
"am33xx" family. In the first generation of this family the DDR
initialization sequence is quite different from all of the subsequent
generations. Whereas with ti814x (second generation) we can easily work
the minor differenced between that and am33xx (third generation), our
attempts to do this for ti816x weren't sufficient. Rather than add a
large amount of #ifdef logic to make this different sequence work we add
a new file, ti816x_emif4.c to handle the various required undocumented
register writes and sequence and leverage what we can from
arch/arm/mach-omap2/am33xx/ddr.c still. As DDR2 has similar problems
today but I am unable to test it, we drop the DDR2 defines from the code
rather than imply that it works by leaving it. We also remove a bunch
of other untested code about changing the speed the DDR runs at.
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-omap2/am33xx/clock_ti816x.c b/arch/arm/mach-omap2/am33xx/clock_ti816x.c
index 079ddd7..967623d 100644
--- a/arch/arm/mach-omap2/am33xx/clock_ti816x.c
+++ b/arch/arm/mach-omap2/am33xx/clock_ti816x.c
@@ -54,57 +54,8 @@
#define MAIN_MDIV7 0x4
/* DDR PLL */
-#if defined(CONFIG_TI816X_DDR_PLL_400) /* 400 MHz */
#define DDR_N 59
#define DDR_P 0x1
-#define DDR_MDIV1 0x4
-#define DDR_INTFREQ2 0x8
-#define DDR_FRACFREQ2 0xD99999
-#define DDR_MDIV2 0x1E
-#define DDR_INTFREQ3 0x8
-#define DDR_FRACFREQ3 0x0
-#define DDR_MDIV3 0x4
-#define DDR_INTFREQ4 0xE /* Expansion DDR clk */
-#define DDR_FRACFREQ4 0x0
-#define DDR_MDIV4 0x4
-#define DDR_INTFREQ5 0xE /* Expansion DDR clk */
-#define DDR_FRACFREQ5 0x0
-#define DDR_MDIV5 0x4
-#elif defined(CONFIG_TI816X_DDR_PLL_531) /* 531 MHz */
-#define DDR_N 59
-#define DDR_P 0x1
-#define DDR_MDIV1 0x3
-#define DDR_INTFREQ2 0x8
-#define DDR_FRACFREQ2 0xD99999
-#define DDR_MDIV2 0x1E
-#define DDR_INTFREQ3 0x8
-#define DDR_FRACFREQ3 0x0
-#define DDR_MDIV3 0x4
-#define DDR_INTFREQ4 0xE /* Expansion DDR clk */
-#define DDR_FRACFREQ4 0x0
-#define DDR_MDIV4 0x4
-#define DDR_INTFREQ5 0xE /* Expansion DDR clk */
-#define DDR_FRACFREQ5 0x0
-#define DDR_MDIV5 0x4
-#elif defined(CONFIG_TI816X_DDR_PLL_675) /* 675 MHz */
-#define DDR_N 50
-#define DDR_P 0x1
-#define DDR_MDIV1 0x2
-#define DDR_INTFREQ2 0x9
-#define DDR_FRACFREQ2 0x0
-#define DDR_MDIV2 0x19
-#define DDR_INTFREQ3 0x13
-#define DDR_FRACFREQ3 0x800000
-#define DDR_MDIV3 0x2
-#define DDR_INTFREQ4 0xE /* Expansion DDR clk */
-#define DDR_FRACFREQ4 0x0
-#define DDR_MDIV4 0x4
-#define DDR_INTFREQ5 0xE /* Expansion DDR clk */
-#define DDR_FRACFREQ5 0x0
-#define DDR_MDIV5 0x4
-#elif defined(CONFIG_TI816X_DDR_PLL_796) /* 796 MHz */
-#define DDR_N 59
-#define DDR_P 0x1
#define DDR_MDIV1 0x2
#define DDR_INTFREQ2 0x8
#define DDR_FRACFREQ2 0xD99999
@@ -118,12 +69,10 @@
#define DDR_INTFREQ5 0xE /* Expansion DDR clk */
#define DDR_FRACFREQ5 0x0
#define DDR_MDIV5 0x4
-#endif
#define CONTROL_STATUS (CTRL_BASE + 0x40)
#define DDR_RCD (CTRL_BASE + 0x070C)
#define CM_TIMER1_CLKSEL (PRCM_BASE + 0x390)
-#define DMM_PAT_BASE_ADDR (DMM_BASE + 0x420)
#define CM_ALWON_CUST_EFUSE_CLKCTRL (PRCM_BASE + 0x1628)
#define INTCPS_SYSCONFIG 0x48200010
@@ -187,6 +136,15 @@
void enable_dmm_clocks(void)
{
+ writel(PRCM_MOD_EN, &cmdef->dmmclkctrl);
+ /* Wait for dmm to be fully functional, including OCP */
+ while (((readl(&cmdef->dmmclkctrl) >> 17) & 0x3) != 0)
+ ;
+}
+
+void enable_emif_clocks(void)
+{
+ writel(PRCM_MOD_EN, &cmdef->fwclkctrl);
writel(PRCM_MOD_EN, &cmdef->l3fastclkstctrl);
writel(PRCM_MOD_EN, &cmdef->emif0clkctrl);
writel(PRCM_MOD_EN, &cmdef->emif1clkctrl);
@@ -200,14 +158,6 @@
/* Wait for emif1 to be fully functional, including OCP */
while (((readl(&cmdef->emif1clkctrl) >> 17) & 0x3) != 0)
;
-
- writel(PRCM_MOD_EN, &cmdef->dmmclkctrl);
- /* Wait for dmm to be fully functional, including OCP */
- while (((readl(&cmdef->dmmclkctrl) >> 17) & 0x3) != 0)
- ;
-
- /* Enable Tiled Access */
- writel(0x80000000, DMM_PAT_BASE_ADDR);
}
/* assume delay is aprox at least 1us */