diff options
Diffstat (limited to 'arch/arm/mach-omap2/prm3xxx.c')
| -rw-r--r-- | arch/arm/mach-omap2/prm3xxx.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/prm3xxx.c b/arch/arm/mach-omap2/prm3xxx.c index 4bd7a2dca8af..2458be6fc67b 100644 --- a/arch/arm/mach-omap2/prm3xxx.c +++ b/arch/arm/mach-omap2/prm3xxx.c @@ -26,6 +26,8 @@ #include "prm2xxx_3xxx.h" #include "cm2xxx_3xxx.h" #include "prm-regbits-34xx.h" +#include "cm3xxx.h" +#include "cm-regbits-34xx.h" static const struct omap_prcm_irq omap3_prcm_irqs[] = { OMAP_PRCM_IRQ("wkup", 0, 0), @@ -206,6 +208,167 @@ void omap3xxx_prm_restore_irqen(u32 *saved_mask) } /** + * omap3xxx_prm_clear_mod_irqs - clear wake-up events from PRCM interrupt + * @module: PRM module to clear wakeups from + * @regs: register set to clear, 1 or 3 + * @ignore_bits: wakeup status bits to ignore + * + * The purpose of this function is to clear any wake-up events latched + * in the PRCM PM_WKST_x registers. It is possible that a wake-up event + * may occur whilst attempting to clear a PM_WKST_x register and thus + * set another bit in this register. A while loop is used to ensure + * that any peripheral wake-up events occurring while attempting to + * clear the PM_WKST_x are detected and cleared. + */ +int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits) +{ + u32 wkst, fclk, iclk, clken; + u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1; + u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1; + u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1; + u16 grpsel_off = (regs == 3) ? + OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL; + int c = 0; + + wkst = omap2_prm_read_mod_reg(module, wkst_off); + wkst &= omap2_prm_read_mod_reg(module, grpsel_off); + wkst &= ~ignore_bits; + if (wkst) { + iclk = omap2_cm_read_mod_reg(module, iclk_off); + fclk = omap2_cm_read_mod_reg(module, fclk_off); + while (wkst) { + clken = wkst; + omap2_cm_set_mod_reg_bits(clken, module, iclk_off); + /* + * For USBHOST, we don't know whether HOST1 or + * HOST2 woke us up, so enable both f-clocks + */ + if (module == OMAP3430ES2_USBHOST_MOD) + clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT; + omap2_cm_set_mod_reg_bits(clken, module, fclk_off); + omap2_prm_write_mod_reg(wkst, module, wkst_off); + wkst = omap2_prm_read_mod_reg(module, wkst_off); + wkst &= ~ignore_bits; + c++; + } + omap2_cm_write_mod_reg(iclk, module, iclk_off); + omap2_cm_write_mod_reg(fclk, module, fclk_off); + } + + return c; +} + +/** + * omap3_prm_reset_modem - toggle reset signal for modem + * + * Toggles the reset signal to modem IP block. Required to allow + * OMAP3430 without stacked modem to idle properly. + */ +void __init omap3_prm_reset_modem(void) +{ + omap2_prm_write_mod_reg( + OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK | + OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK, + CORE_MOD, OMAP2_RM_RSTCTRL); + omap2_prm_write_mod_reg(0, CORE_MOD, OMAP2_RM_RSTCTRL); +} + +/** + * omap3_prm_init_pm - initialize PM related registers for PRM + * @has_uart4: SoC has UART4 + * @has_iva: SoC has IVA + * + * Initializes PRM registers for PM use. Called from PM init. + */ +void __init omap3_prm_init_pm(bool has_uart4, bool has_iva) +{ + u32 en_uart4_mask; + u32 grpsel_uart4_mask; + + /* + * Enable control of expternal oscillator through + * sys_clkreq. In the long run clock framework should + * take care of this. + */ + omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK, + 1 << OMAP_AUTOEXTCLKMODE_SHIFT, + OMAP3430_GR_MOD, + OMAP3_PRM_CLKSRC_CTRL_OFFSET); + + /* setup wakup source */ + omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK | + OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK, + WKUP_MOD, PM_WKEN); + /* No need to write EN_IO, that is always enabled */ + omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK | + OMAP3430_GRPSEL_GPT1_MASK | + OMAP3430_GRPSEL_GPT12_MASK, + WKUP_MOD, OMAP3430_PM_MPUGRPSEL); + + /* Enable PM_WKEN to support DSS LPR */ + omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK, + OMAP3430_DSS_MOD, PM_WKEN); + + if (has_uart4) { + en_uart4_mask = OMAP3630_EN_UART4_MASK; + grpsel_uart4_mask = OMAP3630_GRPSEL_UART4_MASK; + } + + /* Enable wakeups in PER */ + omap2_prm_write_mod_reg(en_uart4_mask | + OMAP3430_EN_GPIO2_MASK | + OMAP3430_EN_GPIO3_MASK | + OMAP3430_EN_GPIO4_MASK | + OMAP3430_EN_GPIO5_MASK | + OMAP3430_EN_GPIO6_MASK | + OMAP3430_EN_UART3_MASK | + OMAP3430_EN_MCBSP2_MASK | + OMAP3430_EN_MCBSP3_MASK | + OMAP3430_EN_MCBSP4_MASK, + OMAP3430_PER_MOD, PM_WKEN); + + /* and allow them to wake up MPU */ + omap2_prm_write_mod_reg(grpsel_uart4_mask | + OMAP3430_GRPSEL_GPIO2_MASK | + OMAP3430_GRPSEL_GPIO3_MASK | + OMAP3430_GRPSEL_GPIO4_MASK | + OMAP3430_GRPSEL_GPIO5_MASK | + OMAP3430_GRPSEL_GPIO6_MASK | + OMAP3430_GRPSEL_UART3_MASK | + OMAP3430_GRPSEL_MCBSP2_MASK | + OMAP3430_GRPSEL_MCBSP3_MASK | + OMAP3430_GRPSEL_MCBSP4_MASK, + OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL); + + /* Don't attach IVA interrupts */ + if (has_iva) { + omap2_prm_write_mod_reg(0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL); + omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1); + omap2_prm_write_mod_reg(0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3); + omap2_prm_write_mod_reg(0, OMAP3430_PER_MOD, + OMAP3430_PM_IVAGRPSEL); + } + + /* Clear any pending 'reset' flags */ + omap2_prm_write_mod_reg(0xffffffff, MPU_MOD, OMAP2_RM_RSTST); + omap2_prm_write_mod_reg(0xffffffff, CORE_MOD, OMAP2_RM_RSTST); + omap2_prm_write_mod_reg(0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST); + omap2_prm_write_mod_reg(0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST); + omap2_prm_write_mod_reg(0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST); + omap2_prm_write_mod_reg(0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST); + omap2_prm_write_mod_reg(0xffffffff, OMAP3430ES2_USBHOST_MOD, + OMAP2_RM_RSTST); + + /* Clear any pending PRCM interrupts */ + omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); + + /* We need to idle iva2_pwrdm even on am3703 with no iva2. */ + omap3xxx_prm_iva_idle(); + + omap3_prm_reset_modem(); +} + +/** * omap3xxx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain * * Clear any previously-latched I/O wakeup events and ensure that the @@ -276,6 +439,76 @@ 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); + + /* 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); +} + +/** + * omap3xxx_prm_clear_global_cold_reset - checks the global cold reset status + * and clears it if asserted + * + * Checks if cold-reset has occurred and clears the status bit if yes. Returns + * 1 if cold-reset has occurred, 0 otherwise. + */ +int omap3xxx_prm_clear_global_cold_reset(void) +{ + if (omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP3_PRM_RSTST_OFFSET) & + OMAP3430_GLOBAL_COLD_RST_MASK) { + omap2_prm_set_mod_reg_bits(OMAP3430_GLOBAL_COLD_RST_MASK, + OMAP3430_GR_MOD, + OMAP3_PRM_RSTST_OFFSET); + return 1; + } + + return 0; +} + +void omap3_prm_save_scratchpad_contents(u32 *ptr) +{ + *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD, + OMAP3_PRM_CLKSRC_CTRL_OFFSET); + + *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD, + OMAP3_PRM_CLKSEL_OFFSET); +} + /* Powerdomain low-level functions */ static int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst) |