diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/armv7/omap3/sdrc.c | 116 |
1 files changed, 61 insertions, 55 deletions
diff --git a/arch/arm/cpu/armv7/omap3/sdrc.c b/arch/arm/cpu/armv7/omap3/sdrc.c index 66ce33f..2756024 100644 --- a/arch/arm/cpu/armv7/omap3/sdrc.c +++ b/arch/arm/cpu/armv7/omap3/sdrc.c @@ -108,14 +108,45 @@ u32 get_sdr_cs_offset(u32 cs) } /* + * write_sdrc_timings - + * - Takes CS and associated timings and initalize SDRAM + * - Test CS to make sure it's OK for use + */ +static void write_sdrc_timings(u32 cs, struct sdrc_actim *sdrc_actim_base, + u32 mcfg, u32 ctrla, u32 ctrlb, u32 rfr_ctrl, u32 mr) +{ + /* Setup timings we got from the board. */ + writel(mcfg, &sdrc_base->cs[cs].mcfg); + writel(ctrla, &sdrc_actim_base->ctrla); + writel(ctrlb, &sdrc_actim_base->ctrlb); + writel(rfr_ctrl, &sdrc_base->cs[cs].rfr_ctrl); + writel(CMD_NOP, &sdrc_base->cs[cs].manual); + writel(CMD_PRECHARGE, &sdrc_base->cs[cs].manual); + writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual); + writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual); + writel(mr, &sdrc_base->cs[cs].mr); + + /* + * Test ram in this bank + * Disable if bad or not present + */ + if (!mem_ok(cs)) + writel(0, &sdrc_base->cs[cs].mcfg); +} + +/* * do_sdrc_init - - * - Initialize the SDRAM for use. - * - code called once in C-Stack only context for CS0 and a possible 2nd - * time depending on memory configuration from stack+global context + * - Code called once in C-Stack only context for CS0 and with early being + * true and a possible 2nd time depending on memory configuration from + * stack+global context. */ void do_sdrc_init(u32 cs, u32 early) { struct sdrc_actim *sdrc_actim_base0, *sdrc_actim_base1; + u32 mcfg, ctrla, ctrlb, rfr_ctrl, mr; + + sdrc_actim_base0 = (struct sdrc_actim *)SDRC_ACTIM_CTRL0_BASE; + sdrc_actim_base1 = (struct sdrc_actim *)SDRC_ACTIM_CTRL1_BASE; if (early) { /* reset sdrc controller */ @@ -127,73 +158,48 @@ void do_sdrc_init(u32 cs, u32 early) /* setup sdrc to ball mux */ writel(SDRC_SHARING, &sdrc_base->sharing); - /* Disable Power Down of CKE cuz of 1 CKE on combo part */ + /* Disable Power Down of CKE because of 1 CKE on combo part */ writel(WAKEUPPROC | SRFRONRESET | PAGEPOLICY_HIGH, &sdrc_base->power); writel(ENADLL | DLLPHASE_90, &sdrc_base->dlla_ctrl); sdelay(0x20000); - } - /* As long as V_MCFG and V_RFR_CTRL is not defined for all OMAP3 boards we need * to prevent this to be build in non-SPL build */ #ifdef CONFIG_SPL_BUILD - /* If we use a SPL there is no x-loader nor config header so we have - * to do the job ourselfs - */ - if (cs == CS0) { - sdrc_actim_base0 = (struct sdrc_actim *)SDRC_ACTIM_CTRL0_BASE; - - /* General SDRC config */ - writel(V_MCFG, &sdrc_base->cs[cs].mcfg); - writel(V_RFR_CTRL, &sdrc_base->cs[cs].rfr_ctrl); - - /* AC timings */ - writel(V_ACTIMA_165, &sdrc_actim_base0->ctrla); - writel(V_ACTIMB_165, &sdrc_actim_base0->ctrlb); - - /* Initialize */ - writel(CMD_NOP, &sdrc_base->cs[cs].manual); - writel(CMD_PRECHARGE, &sdrc_base->cs[cs].manual); - writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual); - writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual); + /* + * If we use a SPL there is no x-loader nor config header so + * we have to do the job ourselfs + */ + + mcfg = V_MCFG; + ctrla = V_ACTIMA_165; + ctrlb = V_ACTIMB_165; + rfr_ctrl = V_RFR_CTRL; + mr = V_MR; + + write_sdrc_timings(CS0, sdrc_actim_base0, mcfg, ctrla, ctrlb, + rfr_ctrl, mr); +#endif - writel(V_MR, &sdrc_base->cs[cs].mr); } -#endif /* - * SDRC timings are set up by x-load or config header - * We don't need to redo them here. - * Older x-loads configure only CS0 - * configure CS1 to handle this ommission + * If we aren't using SPL we have been loaded by some + * other means which may not have correctly initialized + * both CS0 and CS1 (such as some older versions of x-loader) + * so we may be asked now to setup CS1. */ if (cs == CS1) { - sdrc_actim_base0 = (struct sdrc_actim *)SDRC_ACTIM_CTRL0_BASE; - sdrc_actim_base1 = (struct sdrc_actim *)SDRC_ACTIM_CTRL1_BASE; - writel(readl(&sdrc_base->cs[CS0].mcfg), - &sdrc_base->cs[CS1].mcfg); - writel(readl(&sdrc_base->cs[CS0].rfr_ctrl), - &sdrc_base->cs[CS1].rfr_ctrl); - writel(readl(&sdrc_actim_base0->ctrla), - &sdrc_actim_base1->ctrla); - writel(readl(&sdrc_actim_base0->ctrlb), - &sdrc_actim_base1->ctrlb); - - writel(CMD_NOP, &sdrc_base->cs[cs].manual); - writel(CMD_PRECHARGE, &sdrc_base->cs[cs].manual); - writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual); - writel(CMD_AUTOREFRESH, &sdrc_base->cs[cs].manual); - writel(readl(&sdrc_base->cs[CS0].mr), - &sdrc_base->cs[CS1].mr); - } + mcfg = readl(&sdrc_base->cs[CS0].mcfg), + rfr_ctrl = readl(&sdrc_base->cs[CS0].rfr_ctrl); + ctrla = readl(&sdrc_actim_base0->ctrla), + ctrlb = readl(&sdrc_actim_base0->ctrlb); + mr = readl(&sdrc_base->cs[CS0].mr); + write_sdrc_timings(cs, sdrc_actim_base1, mcfg, ctrla, ctrlb, + rfr_ctrl, mr); - /* - * Test ram in this bank - * Disable if bad or not present - */ - if (!mem_ok(cs)) - writel(0, &sdrc_base->cs[cs].mcfg); + } } /* |