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| author | Tero Kristo <t-kristo@ti.com> | 2014-02-25 20:04:56 +0400 |
|---|---|---|
| committer | Tero Kristo <t-kristo@ti.com> | 2014-07-04 18:02:11 +0400 |
| commit | 9de367fae0d9907e19d065e0381ecd3f4003e08f (patch) | |
| tree | 2119d1cf518618ea46d07b4a59f6347edf5d5e6f /arch/arm/mach-omap2/prm3xxx.c | |
| parent | 0efc0f6ec2d6c6497e401df171705c5762f5a061 (diff) | |
| download | linux-9de367fae0d9907e19d065e0381ecd3f4003e08f.tar.xz | |
ARM: OMAP3: PRM: move iva reset to PRM driver
This is a more proper isolation of the code. Done in preparation of making
PRM an individual driver.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/prm3xxx.c')
| -rw-r--r-- | arch/arm/mach-omap2/prm3xxx.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/prm3xxx.c b/arch/arm/mach-omap2/prm3xxx.c index 014ba70d2dfb..a575b6964bf9 100644 --- a/arch/arm/mach-omap2/prm3xxx.c +++ b/arch/arm/mach-omap2/prm3xxx.c @@ -28,6 +28,7 @@ #include "prm-regbits-34xx.h" #include "cm3xxx.h" #include "cm-regbits-34xx.h" +#include "control.h" static const struct omap_prcm_irq omap3_prcm_irqs[] = { OMAP_PRCM_IRQ("wkup", 0, 0), @@ -329,6 +330,50 @@ static u32 omap3xxx_prm_read_reset_sources(void) return r; } +/** + * omap3xxx_prm_iva_idle - ensure IVA is in idle so it can be put into retention + * + * In cases where IVA2 is activated by bootcode, it may prevent + * full-chip retention or off-mode because it is not idle. This + * function forces the IVA2 into idle state so it can go + * into retention/off and thus allow full-chip retention/off. + */ +void omap3xxx_prm_iva_idle(void) +{ + /* ensure IVA2 clock is disabled */ + omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN); + + /* if no clock activity, nothing else to do */ + if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) & + OMAP3430_CLKACTIVITY_IVA2_MASK)) + return; + + /* Reset IVA2 */ + omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK | + OMAP3430_RST2_IVA2_MASK | + OMAP3430_RST3_IVA2_MASK, + OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); + + /* Enable IVA2 clock */ + omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK, + OMAP3430_IVA2_MOD, CM_FCLKEN); + + /* Set IVA2 boot mode to 'idle' */ + omap3_ctrl_set_iva_bootmode_idle(); + + /* Un-reset IVA2 */ + omap2_prm_write_mod_reg(0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); + + /* Disable IVA2 clock */ + omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN); + + /* Reset IVA2 */ + omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK | + OMAP3430_RST2_IVA2_MASK | + OMAP3430_RST3_IVA2_MASK, + OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL); +} + /* Powerdomain low-level functions */ static int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) |