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-rw-r--r--arch/arm/mach-omap2/prm44xx.c699
1 files changed, 635 insertions, 64 deletions
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index a1ff918d9be..a7f6ea27180 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) 2010 Texas Instruments, Inc.
+ * Copyright (C) 2011-2012 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
@@ -15,102 +16,672 @@
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/err.h>
+#include <linux/io.h>
-#include <plat/common.h>
-#include <plat/cpu.h>
-#include <plat/prcm.h>
-#include "prm.h"
+#include "soc.h"
+#include "iomap.h"
+#include "common.h"
+#include "vp.h"
+#include "prm44xx.h"
#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),
+ 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 = 11 + OMAP44XX_IRQ_GIC_START,
+ .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,
+ .reconfigure_io_chain = &omap44xx_prm_reconfigure_io_chain,
+};
/*
- * Address offset (in bytes) between the reset control and the reset
- * status registers: 4 bytes on OMAP4
+ * 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)
*/
-#define OMAP4_RST_CTRL_ST_OFFSET 4
+static struct prm_reset_src_map omap44xx_prm_reset_src_map[] = {
+ { OMAP4430_GLOBAL_WARM_SW_RST_SHIFT,
+ OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
+ { OMAP4430_GLOBAL_COLD_RST_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 */
+u32 omap4_prm_read_inst_reg(s16 inst, u16 reg)
+{
+ return readl_relaxed(prm_base + inst + reg);
+}
+
+/* Write into a register in a CM/PRM instance in the PRM module */
+void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg)
+{
+ writel_relaxed(val, prm_base + inst + reg);
+}
+
+/* Read-modify-write a register in a PRM module. Caller must lock */
+u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
+{
+ u32 v;
+
+ v = omap4_prm_read_inst_reg(inst, reg);
+ v &= ~mask;
+ v |= bits;
+ omap4_prm_write_inst_reg(v, inst, reg);
+
+ return v;
+}
+
+/* PRM VP */
+
+/*
+ * struct omap4_vp - OMAP4 VP register access description.
+ * @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP
+ * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
+ */
+struct omap4_vp {
+ u32 irqstatus_mpu;
+ u32 tranxdone_status;
+};
+
+static struct omap4_vp omap4_vp[] = {
+ [OMAP4_VP_VDD_MPU_ID] = {
+ .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET,
+ .tranxdone_status = OMAP4430_VP_MPU_TRANXDONE_ST_MASK,
+ },
+ [OMAP4_VP_VDD_IVA_ID] = {
+ .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
+ .tranxdone_status = OMAP4430_VP_IVA_TRANXDONE_ST_MASK,
+ },
+ [OMAP4_VP_VDD_CORE_ID] = {
+ .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
+ .tranxdone_status = OMAP4430_VP_CORE_TRANXDONE_ST_MASK,
+ },
+};
+
+u32 omap4_prm_vp_check_txdone(u8 vp_id)
+{
+ struct omap4_vp *vp = &omap4_vp[vp_id];
+ u32 irqstatus;
+
+ irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
+ OMAP4430_PRM_OCP_SOCKET_INST,
+ vp->irqstatus_mpu);
+ return irqstatus & vp->tranxdone_status;
+}
+
+void omap4_prm_vp_clear_txdone(u8 vp_id)
+{
+ struct omap4_vp *vp = &omap4_vp[vp_id];
+
+ omap4_prminst_write_inst_reg(vp->tranxdone_status,
+ OMAP4430_PRM_PARTITION,
+ OMAP4430_PRM_OCP_SOCKET_INST,
+ vp->irqstatus_mpu);
+};
+
+u32 omap4_prm_vcvp_read(u8 offset)
+{
+ return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
+ OMAP4430_PRM_DEVICE_INST, offset);
+}
+
+void omap4_prm_vcvp_write(u32 val, u8 offset)
+{
+ omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION,
+ OMAP4430_PRM_DEVICE_INST, offset);
+}
+
+u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
+{
+ return omap4_prminst_rmw_inst_reg_bits(mask, bits,
+ OMAP4430_PRM_PARTITION,
+ 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_OCP_SOCKET_INST,
+ irqen_offs);
+ st = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, irqst_offs);
+
+ return mask & st;
+}
/**
- * omap4_prm_is_hardreset_asserted - read the HW reset line state of
- * submodules contained in the hwmod module
- * @rstctrl_reg: RM_RSTCTRL register address for this module
- * @shift: register bit shift corresponding to the reset line to check
+ * omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
+ * @events: ptr to two consecutive u32s, preallocated by caller
*
- * Returns 1 if the (sub)module hardreset line is currently asserted,
- * 0 if the (sub)module hardreset line is not currently asserted, or
- * -EINVAL upon parameter error.
+ * 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.
*/
-int omap4_prm_is_hardreset_asserted(void __iomem *rstctrl_reg, u8 shift)
+void omap44xx_prm_read_pending_irqs(unsigned long *events)
{
- if (!cpu_is_omap44xx() || !rstctrl_reg)
- return -EINVAL;
+ 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);
+}
- return omap4_prm_read_bits_shift(rstctrl_reg, (1 << shift));
+/**
+ * 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_OCP_SOCKET_INST,
+ OMAP4_REVISION_PRM_OFFSET);
}
/**
- * omap4_prm_assert_hardreset - assert the HW reset line of a submodule
- * @rstctrl_reg: RM_RSTCTRL register address for this module
- * @shift: register bit shift corresponding to the reset line to assert
+ * omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs
+ * @saved_mask: ptr to a u32 array to save IRQENABLE bits
*
- * Some IPs like dsp, ipu or iva contain processors that require an HW
- * reset line to be asserted / deasserted in order to fully enable the
- * IP. These modules may have multiple hard-reset lines that reset
- * different 'submodules' inside the IP block. This function will
- * place the submodule into reset. Returns 0 upon success or -EINVAL
- * upon an argument error.
+ * 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.
*/
-int omap4_prm_assert_hardreset(void __iomem *rstctrl_reg, u8 shift)
+void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask)
+{
+ saved_mask[0] =
+ omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
+ OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
+ saved_mask[1] =
+ omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
+ OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
+
+ omap4_prm_write_inst_reg(0, OMAP4430_PRM_OCP_SOCKET_INST,
+ OMAP4_PRM_IRQENABLE_MPU_OFFSET);
+ omap4_prm_write_inst_reg(0, OMAP4430_PRM_OCP_SOCKET_INST,
+ OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
+
+ /* OCP barrier */
+ omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_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_OCP_SOCKET_INST,
+ OMAP4_PRM_IRQENABLE_MPU_OFFSET);
+ omap4_prm_write_inst_reg(saved_mask[1], OMAP4430_PRM_OCP_SOCKET_INST,
+ OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
+}
+
+/**
+ * omap44xx_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 waiting for WUCLKOUT to be deasserted.
+ * No return value. XXX Are the final two steps necessary?
+ */
+void omap44xx_prm_reconfigure_io_chain(void)
+{
+ int i = 0;
+
+ /* Trigger WUCLKIN enable */
+ omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK,
+ OMAP4430_WUCLK_CTRL_MASK,
+ OMAP4430_PRM_DEVICE_INST,
+ OMAP4_PRM_IO_PMCTRL_OFFSET);
+ omap_test_timeout(
+ (((omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
+ OMAP4_PRM_IO_PMCTRL_OFFSET) &
+ OMAP4430_WUCLK_STATUS_MASK) >>
+ OMAP4430_WUCLK_STATUS_SHIFT) == 1),
+ MAX_IOPAD_LATCH_TIME, i);
+ if (i == MAX_IOPAD_LATCH_TIME)
+ pr_warn("PRM: I/O chain clock line assertion timed out\n");
+
+ /* Trigger WUCLKIN disable */
+ omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK, 0x0,
+ OMAP4430_PRM_DEVICE_INST,
+ OMAP4_PRM_IO_PMCTRL_OFFSET);
+ omap_test_timeout(
+ (((omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
+ OMAP4_PRM_IO_PMCTRL_OFFSET) &
+ OMAP4430_WUCLK_STATUS_MASK) >>
+ OMAP4430_WUCLK_STATUS_SHIFT) == 0),
+ MAX_IOPAD_LATCH_TIME, i);
+ if (i == MAX_IOPAD_LATCH_TIME)
+ pr_warn("PRM: I/O chain clock line deassertion timed out\n");
+
+ return;
+}
+
+/**
+ * omap44xx_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
+ * omap44xx_prm_reconfigure_io_chain() must be called. No return value.
+ */
+static void __init omap44xx_prm_enable_io_wakeup(void)
+{
+ omap4_prm_rmw_inst_reg_bits(OMAP4430_GLOBAL_WUEN_MASK,
+ OMAP4430_GLOBAL_WUEN_MASK,
+ OMAP4430_PRM_DEVICE_INST,
+ OMAP4_PRM_IO_PMCTRL_OFFSET);
+}
+
+/**
+ * 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_DEVICE_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;
+}
+
+/**
+ * omap44xx_prm_was_any_context_lost_old - was module hardware context lost?
+ * @part: PRM partition ID (e.g., OMAP4430_PRM_PARTITION)
+ * @inst: PRM instance offset (e.g., OMAP4430_PRM_MPU_INST)
+ * @idx: CONTEXT register offset
+ *
+ * Return 1 if any bits were set in the *_CONTEXT_* register
+ * identified by (@part, @inst, @idx), which means that some context
+ * was lost for that module; otherwise, return 0.
+ */
+static bool omap44xx_prm_was_any_context_lost_old(u8 part, s16 inst, u16 idx)
+{
+ return (omap4_prminst_read_inst_reg(part, inst, idx)) ? 1 : 0;
+}
+
+/**
+ * omap44xx_prm_clear_context_lost_flags_old - clear context loss flags
+ * @part: PRM partition ID (e.g., OMAP4430_PRM_PARTITION)
+ * @inst: PRM instance offset (e.g., OMAP4430_PRM_MPU_INST)
+ * @idx: CONTEXT register offset
+ *
+ * Clear hardware context loss bits for the module identified by
+ * (@part, @inst, @idx). No return value. XXX Writes to reserved bits;
+ * is there a way to avoid this?
+ */
+static void omap44xx_prm_clear_context_loss_flags_old(u8 part, s16 inst,
+ u16 idx)
+{
+ omap4_prminst_write_inst_reg(0xffffffff, part, inst, idx);
+}
+
+/* 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 mask;
+ u32 v;
- if (!cpu_is_omap44xx() || !rstctrl_reg)
- return -EINVAL;
+ v = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, pwrdm->prcm_offs,
+ OMAP4_PM_PWSTST);
+ v &= OMAP_POWERSTATEST_MASK;
+ v >>= OMAP_POWERSTATEST_SHIFT;
- mask = 1 << shift;
- omap4_prm_rmw_reg_bits(mask, mask, rstctrl_reg);
+ 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)
+{
+ 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_prm_deassert_hardreset - deassert a submodule hardreset line and wait
- * @rstctrl_reg: RM_RSTCTRL register address for this module
- * @shift: register bit shift corresponding to the reset line to deassert
+ * omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate
+ * @pwrdm: struct powerdomain * to read the state for
*
- * Some IPs like dsp, ipu or iva contain processors that require an HW
- * reset line to be asserted / deasserted in order to fully enable the
- * IP. These modules may have multiple hard-reset lines that reset
- * different 'submodules' inside the IP block. This function will
- * take the submodule out of reset and wait until the PRCM indicates
- * that the reset has completed before returning. Returns 0 upon success or
- * -EINVAL upon an argument error, -EEXIST if the submodule was already out
- * of reset, or -EBUSY if the submodule did not exit reset promptly.
+ * 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.
*/
-int omap4_prm_deassert_hardreset(void __iomem *rstctrl_reg, u8 shift)
+static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
{
- u32 mask;
- void __iomem *rstst_reg;
- int c;
+ int state;
- if (!cpu_is_omap44xx() || !rstctrl_reg)
- return -EINVAL;
+ state = omap4_pwrdm_read_prev_pwrst(pwrdm);
- rstst_reg = rstctrl_reg + OMAP4_RST_CTRL_ST_OFFSET;
+ if (state == PWRDM_POWER_OFF)
+ return PWRDM_POWER_OFF;
- mask = 1 << shift;
+ if (state != PWRDM_POWER_RET)
+ return PWRDM_POWER_RET;
- /* Check the current status to avoid de-asserting the line twice */
- if (omap4_prm_read_bits_shift(rstctrl_reg, mask) == 0)
- return -EEXIST;
+ return omap4_pwrdm_read_logic_retst(pwrdm);
+}
- /* Clear the reset status by writing 1 to the status bit */
- omap4_prm_rmw_reg_bits(0xffffffff, mask, rstst_reg);
- /* de-assert the reset control line */
- omap4_prm_rmw_reg_bits(mask, 0, rstctrl_reg);
- /* wait the status to be set */
- omap_test_timeout(omap4_prm_read_bits_shift(rstst_reg, mask),
- MAX_MODULE_HARDRESET_WAIT, c);
+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?
+ */
- return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
+ /* 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;
+}
+
+static int omap4_check_vcvp(void)
+{
+ /* No VC/VP on dra7xx devices */
+ if (soc_is_dra7xx())
+ return 0;
+
+ return 1;
+}
+
+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,
+ .pwrdm_has_voltdm = omap4_check_vcvp,
+};
+
+static int omap44xx_prm_late_init(void);
+
+/*
+ * XXX document
+ */
+static struct prm_ll_data omap44xx_prm_ll_data = {
+ .read_reset_sources = &omap44xx_prm_read_reset_sources,
+ .was_any_context_lost_old = &omap44xx_prm_was_any_context_lost_old,
+ .clear_context_loss_flags_old = &omap44xx_prm_clear_context_loss_flags_old,
+ .late_init = &omap44xx_prm_late_init,
+};
+
+int __init omap44xx_prm_init(void)
+{
+ if (cpu_is_omap44xx())
+ prm_features |= PRM_HAS_IO_WAKEUP;
+
+ return prm_register(&omap44xx_prm_ll_data);
+}
+
+static int omap44xx_prm_late_init(void)
+{
+ if (!(prm_features & PRM_HAS_IO_WAKEUP))
+ return 0;
+
+ omap44xx_prm_enable_io_wakeup();
+
+ return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
}
+static void __exit omap44xx_prm_exit(void)
+{
+ prm_unregister(&omap44xx_prm_ll_data);
+}
+__exitcall(omap44xx_prm_exit);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-03 18:37:42 +0000