diff options
Diffstat (limited to 'arch/arm/mach-omap2/prm3xxx.c')
| -rw-r--r-- | arch/arm/mach-omap2/prm3xxx.c | 417 |
1 files changed, 417 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/prm3xxx.c b/arch/arm/mach-omap2/prm3xxx.c new file mode 100644 index 000000000000..b86116cf0db9 --- /dev/null +++ b/arch/arm/mach-omap2/prm3xxx.c @@ -0,0 +1,417 @@ +/* + * OMAP3xxx PRM module functions + * + * Copyright (C) 2010-2012 Texas Instruments, Inc. + * Copyright (C) 2010 Nokia Corporation + * Benoît Cousson + * Paul Walmsley + * Rajendra Nayak <rnayak@ti.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/irq.h> + +#include "common.h" +#include <plat/cpu.h> + +#include "vp.h" +#include "powerdomain.h" +#include "prm3xxx.h" +#include "prm2xxx_3xxx.h" +#include "cm2xxx_3xxx.h" +#include "prm-regbits-34xx.h" + +static const struct omap_prcm_irq omap3_prcm_irqs[] = { + OMAP_PRCM_IRQ("wkup", 0, 0), + OMAP_PRCM_IRQ("io", 9, 1), +}; + +static struct omap_prcm_irq_setup omap3_prcm_irq_setup = { + .ack = OMAP3_PRM_IRQSTATUS_MPU_OFFSET, + .mask = OMAP3_PRM_IRQENABLE_MPU_OFFSET, + .nr_regs = 1, + .irqs = omap3_prcm_irqs, + .nr_irqs = ARRAY_SIZE(omap3_prcm_irqs), + .irq = 11 + OMAP_INTC_START, + .read_pending_irqs = &omap3xxx_prm_read_pending_irqs, + .ocp_barrier = &omap3xxx_prm_ocp_barrier, + .save_and_clear_irqen = &omap3xxx_prm_save_and_clear_irqen, + .restore_irqen = &omap3xxx_prm_restore_irqen, +}; + +/* + * omap3_prm_reset_src_map - map from bits in the PRM_RSTST hardware + * register (which are specific to OMAP3xxx SoCs) to reset source ID + * bit shifts (which is an OMAP SoC-independent enumeration) + */ +static struct prm_reset_src_map omap3xxx_prm_reset_src_map[] = { + { OMAP3430_GLOBAL_COLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT }, + { OMAP3430_GLOBAL_SW_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT }, + { OMAP3430_SECURITY_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT }, + { OMAP3430_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT }, + { OMAP3430_SECURE_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT }, + { OMAP3430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT }, + { OMAP3430_VDD1_VOLTAGE_MANAGER_RST_SHIFT, + OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT }, + { OMAP3430_VDD2_VOLTAGE_MANAGER_RST_SHIFT, + OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT }, + { OMAP3430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT }, + { OMAP3430_ICECRUSHER_RST_SHIFT, OMAP_ICECRUSHER_RST_SRC_ID_SHIFT }, + { -1, -1 }, +}; + +/* PRM VP */ + +/* + * struct omap3_vp - OMAP3 VP register access description. + * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg + */ +struct omap3_vp { + u32 tranxdone_status; +}; + +static struct omap3_vp omap3_vp[] = { + [OMAP3_VP_VDD_MPU_ID] = { + .tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK, + }, + [OMAP3_VP_VDD_CORE_ID] = { + .tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK, + }, +}; + +#define MAX_VP_ID ARRAY_SIZE(omap3_vp); + +u32 omap3_prm_vp_check_txdone(u8 vp_id) +{ + struct omap3_vp *vp = &omap3_vp[vp_id]; + u32 irqstatus; + + irqstatus = omap2_prm_read_mod_reg(OCP_MOD, + OMAP3_PRM_IRQSTATUS_MPU_OFFSET); + return irqstatus & vp->tranxdone_status; +} + +void omap3_prm_vp_clear_txdone(u8 vp_id) +{ + struct omap3_vp *vp = &omap3_vp[vp_id]; + + omap2_prm_write_mod_reg(vp->tranxdone_status, + OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); +} + +u32 omap3_prm_vcvp_read(u8 offset) +{ + return omap2_prm_read_mod_reg(OMAP3430_GR_MOD, offset); +} + +void omap3_prm_vcvp_write(u32 val, u8 offset) +{ + omap2_prm_write_mod_reg(val, OMAP3430_GR_MOD, offset); +} + +u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset) +{ + return omap2_prm_rmw_mod_reg_bits(mask, bits, OMAP3430_GR_MOD, offset); +} + +/** + * omap3xxx_prm_dpll3_reset - use DPLL3 reset to reboot the OMAP SoC + * + * Set the DPLL3 reset bit, which should reboot the SoC. This is the + * recommended way to restart the SoC, considering Errata i520. No + * return value. + */ +void omap3xxx_prm_dpll3_reset(void) +{ + omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, OMAP3430_GR_MOD, + OMAP2_RM_RSTCTRL); + /* OCP barrier */ + omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP2_RM_RSTCTRL); +} + +/** + * omap3xxx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events + * @events: ptr to a u32, preallocated by caller + * + * Read PRM_IRQSTATUS_MPU bits, AND'ed with the currently-enabled PRM + * MPU IRQs, and store the result into the u32 pointed to by @events. + * No return value. + */ +void omap3xxx_prm_read_pending_irqs(unsigned long *events) +{ + u32 mask, st; + + /* XXX Can the mask read be avoided (e.g., can it come from RAM?) */ + mask = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET); + st = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET); + + events[0] = mask & st; +} + +/** + * omap3xxx_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 omap3xxx_prm_ocp_barrier(void) +{ + omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET); +} + +/** + * omap3xxx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU reg + * @saved_mask: ptr to a u32 array to save IRQENABLE bits + * + * Save the PRM_IRQENABLE_MPU register 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 omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask) +{ + saved_mask[0] = omap2_prm_read_mod_reg(OCP_MOD, + OMAP3_PRM_IRQENABLE_MPU_OFFSET); + omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET); + + /* OCP barrier */ + omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET); +} + +/** + * omap3xxx_prm_restore_irqen - set PRM_IRQENABLE_MPU register from args + * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously + * + * Restore the PRM_IRQENABLE_MPU register from @saved_mask. Intended + * to be used in the PRM interrupt handler resume callback to restore + * values saved by omap3xxx_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 omap3xxx_prm_restore_irqen(u32 *saved_mask) +{ + omap2_prm_write_mod_reg(saved_mask[0], OCP_MOD, + OMAP3_PRM_IRQENABLE_MPU_OFFSET); +} + +/** + * omap3xxx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain + * + * Clear any previously-latched I/O wakeup events and ensure that the + * I/O wakeup gates are aligned with the current mux settings. Works + * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then + * deasserting WUCLKIN and clearing the ST_IO_CHAIN WKST bit. No + * return value. + */ +void omap3xxx_prm_reconfigure_io_chain(void) +{ + int i = 0; + + omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD, + PM_WKEN); + + omap_test_timeout(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST) & + OMAP3430_ST_IO_CHAIN_MASK, + MAX_IOPAD_LATCH_TIME, i); + if (i == MAX_IOPAD_LATCH_TIME) + pr_warn("PRM: I/O chain clock line assertion timed out\n"); + + omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD, + PM_WKEN); + + omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK, WKUP_MOD, + PM_WKST); + + omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST); +} + +/** + * omap3xxx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches + * + * Activates the I/O wakeup event latches and allows events logged by + * those latches to signal a wakeup event to the PRCM. For I/O + * wakeups to occur, WAKEUPENABLE bits must be set in the pad mux + * registers, and omap3xxx_prm_reconfigure_io_chain() must be called. + * No return value. + */ +static void __init omap3xxx_prm_enable_io_wakeup(void) +{ + if (omap3_has_io_wakeup()) + omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD, + PM_WKEN); +} + +/** + * omap3xxx_prm_read_reset_sources - return the last SoC reset source + * + * Return a u32 representing the last reset sources of the SoC. The + * returned reset source bits are standardized across OMAP SoCs. + */ +static u32 omap3xxx_prm_read_reset_sources(void) +{ + struct prm_reset_src_map *p; + u32 r = 0; + u32 v; + + v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST); + + p = omap3xxx_prm_reset_src_map; + while (p->reg_shift >= 0 && p->std_shift >= 0) { + if (v & (1 << p->reg_shift)) + r |= 1 << p->std_shift; + p++; + } + + return r; +} + +/* Powerdomain low-level functions */ + +/* Applicable only for OMAP3. Not supported on OMAP2 */ +static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm) +{ + return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, + OMAP3430_PM_PREPWSTST, + OMAP3430_LASTPOWERSTATEENTERED_MASK); +} + +static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm) +{ + return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, + OMAP2_PM_PWSTST, + OMAP3430_LOGICSTATEST_MASK); +} + +static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm) +{ + return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, + OMAP2_PM_PWSTCTRL, + OMAP3430_LOGICSTATEST_MASK); +} + +static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm) +{ + return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, + OMAP3430_PM_PREPWSTST, + OMAP3430_LASTLOGICSTATEENTERED_MASK); +} + +static int omap3_get_mem_bank_lastmemst_mask(u8 bank) +{ + switch (bank) { + case 0: + return OMAP3430_LASTMEM1STATEENTERED_MASK; + case 1: + return OMAP3430_LASTMEM2STATEENTERED_MASK; + case 2: + return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK; + case 3: + return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK; + default: + WARN_ON(1); /* should never happen */ + return -EEXIST; + } + return 0; +} + +static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank) +{ + u32 m; + + m = omap3_get_mem_bank_lastmemst_mask(bank); + + return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, + OMAP3430_PM_PREPWSTST, m); +} + +static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm) +{ + omap2_prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST); + return 0; +} + +static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm) +{ + return omap2_prm_rmw_mod_reg_bits(0, + 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, + pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL); +} + +static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm) +{ + return omap2_prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, + 0, pwrdm->prcm_offs, + OMAP2_PM_PWSTCTRL); +} + +struct pwrdm_ops omap3_pwrdm_operations = { + .pwrdm_set_next_pwrst = omap2_pwrdm_set_next_pwrst, + .pwrdm_read_next_pwrst = omap2_pwrdm_read_next_pwrst, + .pwrdm_read_pwrst = omap2_pwrdm_read_pwrst, + .pwrdm_read_prev_pwrst = omap3_pwrdm_read_prev_pwrst, + .pwrdm_set_logic_retst = omap2_pwrdm_set_logic_retst, + .pwrdm_read_logic_pwrst = omap3_pwrdm_read_logic_pwrst, + .pwrdm_read_logic_retst = omap3_pwrdm_read_logic_retst, + .pwrdm_read_prev_logic_pwrst = omap3_pwrdm_read_prev_logic_pwrst, + .pwrdm_set_mem_onst = omap2_pwrdm_set_mem_onst, + .pwrdm_set_mem_retst = omap2_pwrdm_set_mem_retst, + .pwrdm_read_mem_pwrst = omap2_pwrdm_read_mem_pwrst, + .pwrdm_read_mem_retst = omap2_pwrdm_read_mem_retst, + .pwrdm_read_prev_mem_pwrst = omap3_pwrdm_read_prev_mem_pwrst, + .pwrdm_clear_all_prev_pwrst = omap3_pwrdm_clear_all_prev_pwrst, + .pwrdm_enable_hdwr_sar = omap3_pwrdm_enable_hdwr_sar, + .pwrdm_disable_hdwr_sar = omap3_pwrdm_disable_hdwr_sar, + .pwrdm_wait_transition = omap2_pwrdm_wait_transition, +}; + +/* + * + */ + +static struct prm_ll_data omap3xxx_prm_ll_data = { + .read_reset_sources = &omap3xxx_prm_read_reset_sources, +}; + +static int __init omap3xxx_prm_init(void) +{ + int ret; + + if (!cpu_is_omap34xx()) + return 0; + + ret = prm_register(&omap3xxx_prm_ll_data); + if (ret) + return ret; + + omap3xxx_prm_enable_io_wakeup(); + ret = omap_prcm_register_chain_handler(&omap3_prcm_irq_setup); + if (!ret) + irq_set_status_flags(omap_prcm_event_to_irq("io"), + IRQ_NOAUTOEN); + + + return ret; +} +subsys_initcall(omap3xxx_prm_init); + +static void __exit omap3xxx_prm_exit(void) +{ + if (!cpu_is_omap34xx()) + return; + + /* Should never happen */ + WARN(prm_unregister(&omap3xxx_prm_ll_data), + "%s: prm_ll_data function pointer mismatch\n", __func__); +} +__exitcall(omap3xxx_prm_exit); |