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-rw-r--r--arch/arm/mach-omap2/prm44xx.c355
1 files changed, 349 insertions, 6 deletions
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index f0c4d5f4a17..a799e9552fb 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -1,10 +1,11 @@
/*
* OMAP4 PRM module functions
*
- * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011-2012 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
@@ -27,6 +28,9 @@
#include "prm-regbits-44xx.h"
#include "prcm44xx.h"
#include "prminst44xx.h"
+#include "powerdomain.h"
+
+/* Static data */
static const struct omap_prcm_irq omap4_prcm_irqs[] = {
OMAP_PRCM_IRQ("wkup", 0, 0),
@@ -46,6 +50,33 @@ static struct omap_prcm_irq_setup omap4_prcm_irq_setup = {
.restore_irqen = &omap44xx_prm_restore_irqen,
};
+/*
+ * omap44xx_prm_reset_src_map - map from bits in the PRM_RSTST
+ * hardware register (which are specific to OMAP44xx SoCs) to reset
+ * source ID bit shifts (which is an OMAP SoC-independent
+ * enumeration)
+ */
+static struct prm_reset_src_map omap44xx_prm_reset_src_map[] = {
+ { OMAP4430_RST_GLOBAL_WARM_SW_SHIFT,
+ OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
+ { OMAP4430_RST_GLOBAL_COLD_SW_SHIFT,
+ OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
+ { OMAP4430_MPU_SECURITY_VIOL_RST_SHIFT,
+ OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
+ { OMAP4430_MPU_WDT_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
+ { OMAP4430_SECURE_WDT_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
+ { OMAP4430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
+ { OMAP4430_VDD_MPU_VOLT_MGR_RST_SHIFT,
+ OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT },
+ { OMAP4430_VDD_IVA_VOLT_MGR_RST_SHIFT,
+ OMAP_VDD_IVA_VM_RST_SRC_ID_SHIFT },
+ { OMAP4430_VDD_CORE_VOLT_MGR_RST_SHIFT,
+ OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT },
+ { OMAP4430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT },
+ { OMAP4430_C2C_RST_SHIFT, OMAP_C2C_RST_SRC_ID_SHIFT },
+ { -1, -1 },
+};
+
/* PRM low-level functions */
/* Read a register in a CM/PRM instance in the PRM module */
@@ -291,12 +322,324 @@ static void __init omap44xx_prm_enable_io_wakeup(void)
OMAP4_PRM_IO_PMCTRL_OFFSET);
}
-static int __init omap4xxx_prcm_init(void)
+/**
+ * omap44xx_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 omap44xx_prm_read_reset_sources(void)
+{
+ struct prm_reset_src_map *p;
+ u32 r = 0;
+ u32 v;
+
+ v = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
+ OMAP4_RM_RSTST);
+
+ p = omap44xx_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 */
+
+static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
+{
+ omap4_prminst_rmw_inst_reg_bits(OMAP_POWERSTATE_MASK,
+ (pwrst << OMAP_POWERSTATE_SHIFT),
+ pwrdm->prcm_partition,
+ pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
+ return 0;
+}
+
+static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
+{
+ u32 v;
+
+ v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTCTRL);
+ v &= OMAP_POWERSTATE_MASK;
+ v >>= OMAP_POWERSTATE_SHIFT;
+
+ return v;
+}
+
+static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm)
+{
+ u32 v;
+
+ v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTST);
+ v &= OMAP_POWERSTATEST_MASK;
+ v >>= OMAP_POWERSTATEST_SHIFT;
+
+ return v;
+}
+
+static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
+{
+ u32 v;
+
+ v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTST);
+ v &= OMAP4430_LASTPOWERSTATEENTERED_MASK;
+ v >>= OMAP4430_LASTPOWERSTATEENTERED_SHIFT;
+
+ return v;
+}
+
+static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
+{
+ omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
+ (1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
+ pwrdm->prcm_partition,
+ pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
+ return 0;
+}
+
+static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
+{
+ omap4_prminst_rmw_inst_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK,
+ OMAP4430_LASTPOWERSTATEENTERED_MASK,
+ pwrdm->prcm_partition,
+ pwrdm->prcm_offs, OMAP4_PM_PWSTST);
+ return 0;
+}
+
+static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
+{
+ u32 v;
+
+ v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK);
+ omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOGICRETSTATE_MASK, v,
+ pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTCTRL);
+
+ return 0;
+}
+
+static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
+ u8 pwrst)
+{
+ u32 m;
+
+ m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
+
+ omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
+ pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTCTRL);
+
+ return 0;
+}
+
+static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
+ u8 pwrst)
+{
+ u32 m;
+
+ m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
+
+ omap4_prminst_rmw_inst_reg_bits(m, (pwrst << __ffs(m)),
+ pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTCTRL);
+
+ return 0;
+}
+
+static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
+{
+ u32 v;
+
+ v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTST);
+ v &= OMAP4430_LOGICSTATEST_MASK;
+ v >>= OMAP4430_LOGICSTATEST_SHIFT;
+
+ return v;
+}
+
+static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
{
- if (cpu_is_omap44xx()) {
- omap44xx_prm_enable_io_wakeup();
- return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
+ u32 v;
+
+ v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTCTRL);
+ v &= OMAP4430_LOGICRETSTATE_MASK;
+ v >>= OMAP4430_LOGICRETSTATE_SHIFT;
+
+ return v;
+}
+
+/**
+ * omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate
+ * @pwrdm: struct powerdomain * to read the state for
+ *
+ * Reads the previous logic powerstate for a powerdomain. This
+ * function must determine the previous logic powerstate by first
+ * checking the previous powerstate for the domain. If that was OFF,
+ * then logic has been lost. If previous state was RETENTION, the
+ * function reads the setting for the next retention logic state to
+ * see the actual value. In every other case, the logic is
+ * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
+ * depending whether the logic was retained or not.
+ */
+static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
+{
+ int state;
+
+ state = omap4_pwrdm_read_prev_pwrst(pwrdm);
+
+ if (state == PWRDM_POWER_OFF)
+ return PWRDM_POWER_OFF;
+
+ if (state != PWRDM_POWER_RET)
+ return PWRDM_POWER_RET;
+
+ return omap4_pwrdm_read_logic_retst(pwrdm);
+}
+
+static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+ u32 m, v;
+
+ m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
+
+ v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTST);
+ v &= m;
+ v >>= __ffs(m);
+
+ return v;
+}
+
+static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
+{
+ u32 m, v;
+
+ m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
+
+ v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTCTRL);
+ v &= m;
+ v >>= __ffs(m);
+
+ return v;
+}
+
+/**
+ * omap4_pwrdm_read_prev_mem_pwrst - reads the previous memory powerstate
+ * @pwrdm: struct powerdomain * to read mem powerstate for
+ * @bank: memory bank index
+ *
+ * Reads the previous memory powerstate for a powerdomain. This
+ * function must determine the previous memory powerstate by first
+ * checking the previous powerstate for the domain. If that was OFF,
+ * then logic has been lost. If previous state was RETENTION, the
+ * function reads the setting for the next memory retention state to
+ * see the actual value. In every other case, the logic is
+ * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
+ * depending whether logic was retained or not.
+ */
+static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+ int state;
+
+ state = omap4_pwrdm_read_prev_pwrst(pwrdm);
+
+ if (state == PWRDM_POWER_OFF)
+ return PWRDM_POWER_OFF;
+
+ if (state != PWRDM_POWER_RET)
+ return PWRDM_POWER_RET;
+
+ return omap4_pwrdm_read_mem_retst(pwrdm, bank);
+}
+
+static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm)
+{
+ u32 c = 0;
+
+ /*
+ * REVISIT: pwrdm_wait_transition() may be better implemented
+ * via a callback and a periodic timer check -- how long do we expect
+ * powerdomain transitions to take?
+ */
+
+ /* XXX Is this udelay() value meaningful? */
+ while ((omap4_prminst_read_inst_reg(pwrdm->prcm_partition,
+ pwrdm->prcm_offs,
+ OMAP4_PM_PWSTST) &
+ OMAP_INTRANSITION_MASK) &&
+ (c++ < PWRDM_TRANSITION_BAILOUT))
+ udelay(1);
+
+ if (c > PWRDM_TRANSITION_BAILOUT) {
+ pr_err("powerdomain: %s: waited too long to complete transition\n",
+ pwrdm->name);
+ return -EAGAIN;
}
+
+ pr_debug("powerdomain: completed transition in %d loops\n", c);
+
return 0;
}
-subsys_initcall(omap4xxx_prcm_init);
+
+struct pwrdm_ops omap4_pwrdm_operations = {
+ .pwrdm_set_next_pwrst = omap4_pwrdm_set_next_pwrst,
+ .pwrdm_read_next_pwrst = omap4_pwrdm_read_next_pwrst,
+ .pwrdm_read_pwrst = omap4_pwrdm_read_pwrst,
+ .pwrdm_read_prev_pwrst = omap4_pwrdm_read_prev_pwrst,
+ .pwrdm_set_lowpwrstchange = omap4_pwrdm_set_lowpwrstchange,
+ .pwrdm_clear_all_prev_pwrst = omap4_pwrdm_clear_all_prev_pwrst,
+ .pwrdm_set_logic_retst = omap4_pwrdm_set_logic_retst,
+ .pwrdm_read_logic_pwrst = omap4_pwrdm_read_logic_pwrst,
+ .pwrdm_read_prev_logic_pwrst = omap4_pwrdm_read_prev_logic_pwrst,
+ .pwrdm_read_logic_retst = omap4_pwrdm_read_logic_retst,
+ .pwrdm_read_mem_pwrst = omap4_pwrdm_read_mem_pwrst,
+ .pwrdm_read_mem_retst = omap4_pwrdm_read_mem_retst,
+ .pwrdm_read_prev_mem_pwrst = omap4_pwrdm_read_prev_mem_pwrst,
+ .pwrdm_set_mem_onst = omap4_pwrdm_set_mem_onst,
+ .pwrdm_set_mem_retst = omap4_pwrdm_set_mem_retst,
+ .pwrdm_wait_transition = omap4_pwrdm_wait_transition,
+};
+
+/*
+ * XXX document
+ */
+static struct prm_ll_data omap44xx_prm_ll_data = {
+ .read_reset_sources = &omap44xx_prm_read_reset_sources,
+};
+
+static int __init omap44xx_prm_init(void)
+{
+ int ret;
+
+ if (!cpu_is_omap44xx())
+ return 0;
+
+ ret = prm_register(&omap44xx_prm_ll_data);
+ if (ret)
+ return ret;
+
+ omap44xx_prm_enable_io_wakeup();
+
+ return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
+}
+subsys_initcall(omap44xx_prm_init);
+
+static void __exit omap44xx_prm_exit(void)
+{
+ if (!cpu_is_omap44xx())
+ return;
+
+ /* Should never happen */
+ WARN(prm_unregister(&omap44xx_prm_ll_data),
+ "%s: prm_ll_data function pointer mismatch\n", __func__);
+}
+__exitcall(omap44xx_prm_exit);