diff options
| author | Heiko Schocher <hs@denx.de> | 2012-01-14 21:42:46 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-02-12 10:11:23 +0100 |
| commit | 3f84108b9946fa0d3bd7e9d7c17dda2da6c8216c (patch) | |
| tree | 33183f7cae0c3ff32d495d90e377d0926adafc05 /arch/arm/cpu/arm926ejs | |
| parent | f59021791b5a09b22c886aa6c1115cd49b730d6c (diff) | |
| download | u-boot-imx-3f84108b9946fa0d3bd7e9d7c17dda2da6c8216c.zip u-boot-imx-3f84108b9946fa0d3bd7e9d7c17dda2da6c8216c.tar.gz u-boot-imx-3f84108b9946fa0d3bd7e9d7c17dda2da6c8216c.tar.bz2 | |
arm, davinci: add workaround for not resetting DMA bus and VPSS modules
The Buffer Logic of VPSS is Not Reset by System Reset Pin, see
http://www.ti.com/lit/er/sprz316b/sprz316b.pdf chapter Advisory 1.2.1
on page 9. Add workaroundcode proposed in the errata.
Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Sandeep Paulraj <s-paulraj@ti.com>
Cc: Tom Rini <tom.rini@gmail.com>
Diffstat (limited to 'arch/arm/cpu/arm926ejs')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/davinci/dm365_lowlevel.c | 52 |
1 files changed, 49 insertions, 3 deletions
diff --git a/arch/arm/cpu/arm926ejs/davinci/dm365_lowlevel.c b/arch/arm/cpu/arm926ejs/davinci/dm365_lowlevel.c index 6e998de..c9936fd 100644 --- a/arch/arm/cpu/arm926ejs/davinci/dm365_lowlevel.c +++ b/arch/arm/cpu/arm926ejs/davinci/dm365_lowlevel.c @@ -254,7 +254,7 @@ int dm365_ddr_setup(void) return 0; } -void dm365_vpss_sync_reset(void) +static void dm365_vpss_sync_reset(void) { unsigned int PdNum = 0; @@ -276,11 +276,52 @@ void dm365_vpss_sync_reset(void) ; } -void dm365_por_reset(void) +static void dm365_por_reset(void) { + struct davinci_timer *wdog = + (struct davinci_timer *)DAVINCI_WDOG_BASE; + if (readl(&dv_pll0_regs->rstype) & - (PLL_RSTYPE_POR | PLL_RSTYPE_XWRST)) + (PLL_RSTYPE_POR | PLL_RSTYPE_XWRST)) { + dm365_vpss_sync_reset(); + + writel(DV_TMPBUF_VAL, TMPBUF); + setbits_le32(TMPSTATUS, FLAG_PORRST); + writel(DV_WDT_ENABLE_SYS_RESET, &wdog->na1); + writel(DV_WDT_TRIGGER_SYS_RESET, &wdog->na2); + + while (1); + } +} + +static void dm365_wdt_reset(void) +{ + struct davinci_timer *wdog = + (struct davinci_timer *)DAVINCI_WDOG_BASE; + + if (readl(TMPBUF) != DV_TMPBUF_VAL) { + writel(DV_TMPBUF_VAL, TMPBUF); + setbits_le32(TMPSTATUS, FLAG_PORRST); + setbits_le32(TMPSTATUS, FLAG_FLGOFF); + + dm365_waitloop(100); + dm365_vpss_sync_reset(); + + writel(DV_WDT_ENABLE_SYS_RESET, &wdog->na1); + writel(DV_WDT_TRIGGER_SYS_RESET, &wdog->na2); + + while (1); + } +} + +static void dm365_wdt_flag_on(void) +{ + /* VPSS_CLKMD 1:2 */ + clrbits_le32(&dv_sys_module_regs->vpss_clkctl, + VPSS_CLK_CTL_VPSS_CLKMD); + writel(0, TMPBUF); + setbits_le32(TMPSTATUS, FLAG_FLGON); } void dm365_psc_init(void) @@ -382,6 +423,9 @@ void dm36x_lowlevel_init(ulong bootflag) writel(0xffffffff, &dv_aintc_regs->irq0); writel(0xffffffff, &dv_aintc_regs->irq1); + dm365_por_reset(); + dm365_wdt_reset(); + /* System PSC setup - enable all */ dm365_psc_init(); @@ -418,6 +462,8 @@ void dm36x_lowlevel_init(ulong bootflag) puts("emif init\n"); dm365_emif_init(); + dm365_wdt_flag_on(); + #if defined(CONFIG_POST) /* * Do memory tests, calls arch_memory_failure_handle() |