diff options
Diffstat (limited to 'arch/arm/mach-omap2/prm44xx.c')
| -rw-r--r-- | arch/arm/mach-omap2/prm44xx.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c index dd885eecf22..a1d6154dc12 100644 --- a/arch/arm/mach-omap2/prm44xx.c +++ b/arch/arm/mach-omap2/prm44xx.c @@ -19,6 +19,7 @@ #include "common.h" #include <plat/cpu.h> +#include <plat/irqs.h> #include <plat/prcm.h> #include "vp.h" @@ -27,6 +28,24 @@ #include "prcm44xx.h" #include "prminst44xx.h" +static const struct omap_prcm_irq omap4_prcm_irqs[] = { + OMAP_PRCM_IRQ("wkup", 0, 0), + OMAP_PRCM_IRQ("io", 9, 1), +}; + +static struct omap_prcm_irq_setup omap4_prcm_irq_setup = { + .ack = OMAP4_PRM_IRQSTATUS_MPU_OFFSET, + .mask = OMAP4_PRM_IRQENABLE_MPU_OFFSET, + .nr_regs = 2, + .irqs = omap4_prcm_irqs, + .nr_irqs = ARRAY_SIZE(omap4_prcm_irqs), + .irq = OMAP44XX_IRQ_PRCM, + .read_pending_irqs = &omap44xx_prm_read_pending_irqs, + .ocp_barrier = &omap44xx_prm_ocp_barrier, + .save_and_clear_irqen = &omap44xx_prm_save_and_clear_irqen, + .restore_irqen = &omap44xx_prm_restore_irqen, +}; + /* PRM low-level functions */ /* Read a register in a CM/PRM instance in the PRM module */ @@ -121,3 +140,101 @@ u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset) OMAP4430_PRM_DEVICE_INST, offset); } + +static inline u32 _read_pending_irq_reg(u16 irqen_offs, u16 irqst_offs) +{ + u32 mask, st; + + /* XXX read mask from RAM? */ + mask = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, irqen_offs); + st = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, irqst_offs); + + return mask & st; +} + +/** + * omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events + * @events: ptr to two consecutive u32s, preallocated by caller + * + * Read PRM_IRQSTATUS_MPU* bits, AND'ed with the currently-enabled PRM + * MPU IRQs, and store the result into the two u32s pointed to by @events. + * No return value. + */ +void omap44xx_prm_read_pending_irqs(unsigned long *events) +{ + events[0] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_OFFSET, + OMAP4_PRM_IRQSTATUS_MPU_OFFSET); + + events[1] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_2_OFFSET, + OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET); +} + +/** + * omap44xx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete + * + * Force any buffered writes to the PRM IP block to complete. Needed + * by the PRM IRQ handler, which reads and writes directly to the IP + * block, to avoid race conditions after acknowledging or clearing IRQ + * bits. No return value. + */ +void omap44xx_prm_ocp_barrier(void) +{ + omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, + OMAP4_REVISION_PRM_OFFSET); +} + +/** + * omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs + * @saved_mask: ptr to a u32 array to save IRQENABLE bits + * + * Save the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers to + * @saved_mask. @saved_mask must be allocated by the caller. + * Intended to be used in the PRM interrupt handler suspend callback. + * The OCP barrier is needed to ensure the write to disable PRM + * interrupts reaches the PRM before returning; otherwise, spurious + * interrupts might occur. No return value. + */ +void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask) +{ + saved_mask[0] = + omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, + OMAP4_PRM_IRQSTATUS_MPU_OFFSET); + saved_mask[1] = + omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, + OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET); + + omap4_prm_write_inst_reg(0, OMAP4430_PRM_DEVICE_INST, + OMAP4_PRM_IRQENABLE_MPU_OFFSET); + omap4_prm_write_inst_reg(0, OMAP4430_PRM_DEVICE_INST, + OMAP4_PRM_IRQENABLE_MPU_2_OFFSET); + + /* OCP barrier */ + omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, + OMAP4_REVISION_PRM_OFFSET); +} + +/** + * omap44xx_prm_restore_irqen - set PRM_IRQENABLE_MPU* registers from args + * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously + * + * Restore the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers from + * @saved_mask. Intended to be used in the PRM interrupt handler resume + * callback to restore values saved by omap44xx_prm_save_and_clear_irqen(). + * No OCP barrier should be needed here; any pending PRM interrupts will fire + * once the writes reach the PRM. No return value. + */ +void omap44xx_prm_restore_irqen(u32 *saved_mask) +{ + omap4_prm_write_inst_reg(saved_mask[0], OMAP4430_PRM_DEVICE_INST, + OMAP4_PRM_IRQENABLE_MPU_OFFSET); + omap4_prm_write_inst_reg(saved_mask[1], OMAP4430_PRM_DEVICE_INST, + OMAP4_PRM_IRQENABLE_MPU_2_OFFSET); +} + +static int __init omap4xxx_prcm_init(void) +{ + if (cpu_is_omap44xx()) + return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup); + return 0; +} +subsys_initcall(omap4xxx_prcm_init); |