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-rw-r--r--arch/arm/mach-omap2/prm3xxx.c417
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 00000000000..b86116cf0db
--- /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
+ * BenoƮt 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);