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Diffstat (limited to 'arch/arm/mach-omap2/cminst44xx.c')
-rw-r--r--arch/arm/mach-omap2/cminst44xx.c150
1 files changed, 133 insertions, 17 deletions
diff --git a/arch/arm/mach-omap2/cminst44xx.c b/arch/arm/mach-omap2/cminst44xx.c
index a482bfa..eb2a472 100644
--- a/arch/arm/mach-omap2/cminst44xx.c
+++ b/arch/arm/mach-omap2/cminst44xx.c
@@ -2,6 +2,7 @@
* OMAP4 CM instance functions
*
* Copyright (C) 2009 Nokia Corporation
+ * Copyright (C) 2011 Texas Instruments, Inc.
* Paul Walmsley
*
* This program is free software; you can redistribute it and/or modify
@@ -32,6 +33,22 @@
#include "prm44xx.h"
#include "prcm_mpu44xx.h"
+/*
+ * CLKCTRL_IDLEST_*: possible values for the CM_*_CLKCTRL.IDLEST bitfield:
+ *
+ * 0x0 func: Module is fully functional, including OCP
+ * 0x1 trans: Module is performing transition: wakeup, or sleep, or sleep
+ * abortion
+ * 0x2 idle: Module is in Idle mode (only OCP part). It is functional if
+ * using separate functional clock
+ * 0x3 disabled: Module is disabled and cannot be accessed
+ *
+ */
+#define CLKCTRL_IDLEST_FUNCTIONAL 0x0
+#define CLKCTRL_IDLEST_INTRANSITION 0x1
+#define CLKCTRL_IDLEST_INTERFACE_IDLE 0x2
+#define CLKCTRL_IDLEST_DISABLED 0x3
+
static u32 _cm_bases[OMAP4_MAX_PRCM_PARTITIONS] = {
[OMAP4430_INVALID_PRCM_PARTITION] = 0,
[OMAP4430_PRM_PARTITION] = OMAP4430_PRM_BASE,
@@ -41,6 +58,48 @@ static u32 _cm_bases[OMAP4_MAX_PRCM_PARTITIONS] = {
[OMAP4430_PRCM_MPU_PARTITION] = OMAP4430_PRCM_MPU_BASE,
};
+/* Private functions */
+
+/**
+ * _clkctrl_idlest - read a CM_*_CLKCTRL register; mask & shift IDLEST bitfield
+ * @part: PRCM partition ID that the CM_CLKCTRL register exists in
+ * @inst: CM instance register offset (*_INST macro)
+ * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
+ * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
+ *
+ * Return the IDLEST bitfield of a CM_*_CLKCTRL register, shifted down to
+ * bit 0.
+ */
+static u32 _clkctrl_idlest(u8 part, u16 inst, s16 cdoffs, u16 clkctrl_offs)
+{
+ u32 v = omap4_cminst_read_inst_reg(part, inst, clkctrl_offs);
+ v &= OMAP4430_IDLEST_MASK;
+ v >>= OMAP4430_IDLEST_SHIFT;
+ return v;
+}
+
+/**
+ * _is_module_ready - can module registers be accessed without causing an abort?
+ * @part: PRCM partition ID that the CM_CLKCTRL register exists in
+ * @inst: CM instance register offset (*_INST macro)
+ * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
+ * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
+ *
+ * Returns true if the module's CM_*_CLKCTRL.IDLEST bitfield is either
+ * *FUNCTIONAL or *INTERFACE_IDLE; false otherwise.
+ */
+static bool _is_module_ready(u8 part, u16 inst, s16 cdoffs, u16 clkctrl_offs)
+{
+ u32 v;
+
+ v = _clkctrl_idlest(part, inst, cdoffs, clkctrl_offs);
+
+ return (v == CLKCTRL_IDLEST_FUNCTIONAL ||
+ v == CLKCTRL_IDLEST_INTERFACE_IDLE) ? true : false;
+}
+
+/* Public functions */
+
/* Read a register in a CM instance */
u32 omap4_cminst_read_inst_reg(u8 part, s16 inst, u16 idx)
{
@@ -200,36 +259,93 @@ void omap4_cminst_clkdm_force_wakeup(u8 part, s16 inst, u16 cdoffs)
*/
/**
- * omap4_cm_wait_module_ready - wait for a module to be in 'func' state
- * @clkctrl_reg: CLKCTRL module address
+ * omap4_cminst_wait_module_ready - wait for a module to be in 'func' state
+ * @part: PRCM partition ID that the CM_CLKCTRL register exists in
+ * @inst: CM instance register offset (*_INST macro)
+ * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
+ * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
*
* Wait for the module IDLEST to be functional. If the idle state is in any
* the non functional state (trans, idle or disabled), module and thus the
* sysconfig cannot be accessed and will probably lead to an "imprecise
* external abort"
+ */
+int omap4_cminst_wait_module_ready(u8 part, u16 inst, s16 cdoffs,
+ u16 clkctrl_offs)
+{
+ int i = 0;
+
+ if (!clkctrl_offs)
+ return 0;
+
+ omap_test_timeout(_is_module_ready(part, inst, cdoffs, clkctrl_offs),
+ MAX_MODULE_READY_TIME, i);
+
+ return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
+}
+
+/**
+ * omap4_cminst_wait_module_idle - wait for a module to be in 'disabled'
+ * state
+ * @part: PRCM partition ID that the CM_CLKCTRL register exists in
+ * @inst: CM instance register offset (*_INST macro)
+ * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
+ * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
*
- * Module idle state:
- * 0x0 func: Module is fully functional, including OCP
- * 0x1 trans: Module is performing transition: wakeup, or sleep, or sleep
- * abortion
- * 0x2 idle: Module is in Idle mode (only OCP part). It is functional if
- * using separate functional clock
- * 0x3 disabled: Module is disabled and cannot be accessed
- *
+ * Wait for the module IDLEST to be disabled. Some PRCM transition,
+ * like reset assertion or parent clock de-activation must wait the
+ * module to be fully disabled.
*/
-int omap4_cm_wait_module_ready(void __iomem *clkctrl_reg)
+int omap4_cminst_wait_module_idle(u8 part, u16 inst, s16 cdoffs, u16 clkctrl_offs)
{
int i = 0;
- if (!clkctrl_reg)
+ if (!clkctrl_offs)
return 0;
- omap_test_timeout((
- ((__raw_readl(clkctrl_reg) & OMAP4430_IDLEST_MASK) == 0) ||
- (((__raw_readl(clkctrl_reg) & OMAP4430_IDLEST_MASK) >>
- OMAP4430_IDLEST_SHIFT) == 0x2)),
- MAX_MODULE_READY_TIME, i);
+ omap_test_timeout((_clkctrl_idlest(part, inst, cdoffs, clkctrl_offs) ==
+ CLKCTRL_IDLEST_DISABLED),
+ MAX_MODULE_READY_TIME, i);
return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
}
+/**
+ * omap4_cminst_module_enable - Enable the modulemode inside CLKCTRL
+ * @mode: Module mode (SW or HW)
+ * @part: PRCM partition ID that the CM_CLKCTRL register exists in
+ * @inst: CM instance register offset (*_INST macro)
+ * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
+ * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
+ *
+ * No return value.
+ */
+void omap4_cminst_module_enable(u8 mode, u8 part, u16 inst, s16 cdoffs,
+ u16 clkctrl_offs)
+{
+ u32 v;
+
+ v = omap4_cminst_read_inst_reg(part, inst, clkctrl_offs);
+ v &= ~OMAP4430_MODULEMODE_MASK;
+ v |= mode << OMAP4430_MODULEMODE_SHIFT;
+ omap4_cminst_write_inst_reg(v, part, inst, clkctrl_offs);
+}
+
+/**
+ * omap4_cminst_module_disable - Disable the module inside CLKCTRL
+ * @part: PRCM partition ID that the CM_CLKCTRL register exists in
+ * @inst: CM instance register offset (*_INST macro)
+ * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
+ * @clkctrl_offs: Module clock control register offset (*_CLKCTRL macro)
+ *
+ * No return value.
+ */
+void omap4_cminst_module_disable(u8 part, u16 inst, s16 cdoffs,
+ u16 clkctrl_offs)
+{
+ u32 v;
+
+ v = omap4_cminst_read_inst_reg(part, inst, clkctrl_offs);
+ v &= ~OMAP4430_MODULEMODE_MASK;
+ omap4_cminst_write_inst_reg(v, part, inst, clkctrl_offs);
+}
generated by cgit v1.1 at 2024-04-19 22:11:49 +0000