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linux-next/arch/arm/mach-omap2/cminst44xx.c
Benoit Cousson 288d6a1618 OMAP4: cm: Add two new APIs for modulemode control 
In OMAP4, a new programming model based on module control instead
of clock control was introduced.
Expose two APIs to allow the upper layer (omap_hwmod) to control
the module mode independently of the parent clocks management.

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: renamed 'omap4_cm_' fns to 'omap4_cminst_'; cleaned up
 kerneldoc]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
2011-07-10 05:56:32 -06:00

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/*
* 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
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This is needed since CM instances can be in the PRM, PRCM_MPU, CM1,
* or CM2 hardware modules. For example, the EMU_CM CM instance is in
* the PRM hardware module. What a mess...
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/io.h>
#include <plat/common.h>
#include "cm.h"
#include "cm1_44xx.h"
#include "cm2_44xx.h"
#include "cm44xx.h"
#include "cminst44xx.h"
#include "cm-regbits-34xx.h"
#include "cm-regbits-44xx.h"
#include "prcm44xx.h"
#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,
[OMAP4430_CM1_PARTITION] = OMAP4430_CM1_BASE,
[OMAP4430_CM2_PARTITION] = OMAP4430_CM2_BASE,
[OMAP4430_SCRM_PARTITION] = 0,
[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)
{
BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
part == OMAP4430_INVALID_PRCM_PARTITION ||
!_cm_bases[part]);
return __raw_readl(OMAP2_L4_IO_ADDRESS(_cm_bases[part] + inst + idx));
}
/* Write into a register in a CM instance */
void omap4_cminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx)
{
BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
part == OMAP4430_INVALID_PRCM_PARTITION ||
!_cm_bases[part]);
__raw_writel(val, OMAP2_L4_IO_ADDRESS(_cm_bases[part] + inst + idx));
}
/* Read-modify-write a register in CM1. Caller must lock */
u32 omap4_cminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst,
s16 idx)
{
u32 v;
v = omap4_cminst_read_inst_reg(part, inst, idx);
v &= ~mask;
v |= bits;
omap4_cminst_write_inst_reg(v, part, inst, idx);
return v;
}
u32 omap4_cminst_set_inst_reg_bits(u32 bits, u8 part, s16 inst, s16 idx)
{
return omap4_cminst_rmw_inst_reg_bits(bits, bits, part, inst, idx);
}
u32 omap4_cminst_clear_inst_reg_bits(u32 bits, u8 part, s16 inst, s16 idx)
{
return omap4_cminst_rmw_inst_reg_bits(bits, 0x0, part, inst, idx);
}
u32 omap4_cminst_read_inst_reg_bits(u8 part, u16 inst, s16 idx, u32 mask)
{
u32 v;
v = omap4_cminst_read_inst_reg(part, inst, idx);
v &= mask;
v >>= __ffs(mask);
return v;
}
/*
*
*/
/**
* _clktrctrl_write - write @c to a CM_CLKSTCTRL.CLKTRCTRL register bitfield
* @c: CLKTRCTRL register bitfield (LSB = bit 0, i.e., unshifted)
* @part: PRCM partition ID that the CM_CLKSTCTRL register exists in
* @inst: CM instance register offset (*_INST macro)
* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
*
* @c must be the unshifted value for CLKTRCTRL - i.e., this function
* will handle the shift itself.
*/
static void _clktrctrl_write(u8 c, u8 part, s16 inst, u16 cdoffs)
{
u32 v;
v = omap4_cminst_read_inst_reg(part, inst, cdoffs + OMAP4_CM_CLKSTCTRL);
v &= ~OMAP4430_CLKTRCTRL_MASK;
v |= c << OMAP4430_CLKTRCTRL_SHIFT;
omap4_cminst_write_inst_reg(v, part, inst, cdoffs + OMAP4_CM_CLKSTCTRL);
}
/**
* omap4_cminst_is_clkdm_in_hwsup - is a clockdomain in hwsup idle mode?
* @part: PRCM partition ID that the CM_CLKSTCTRL register exists in
* @inst: CM instance register offset (*_INST macro)
* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
*
* Returns true if the clockdomain referred to by (@part, @inst, @cdoffs)
* is in hardware-supervised idle mode, or 0 otherwise.
*/
bool omap4_cminst_is_clkdm_in_hwsup(u8 part, s16 inst, u16 cdoffs)
{
u32 v;
v = omap4_cminst_read_inst_reg(part, inst, cdoffs + OMAP4_CM_CLKSTCTRL);
v &= OMAP4430_CLKTRCTRL_MASK;
v >>= OMAP4430_CLKTRCTRL_SHIFT;
return (v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ? true : false;
}
/**
* omap4_cminst_clkdm_enable_hwsup - put a clockdomain in hwsup-idle mode
* @part: PRCM partition ID that the clockdomain registers exist in
* @inst: CM instance register offset (*_INST macro)
* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
*
* Put a clockdomain referred to by (@part, @inst, @cdoffs) into
* hardware-supervised idle mode. No return value.
*/
void omap4_cminst_clkdm_enable_hwsup(u8 part, s16 inst, u16 cdoffs)
{
_clktrctrl_write(OMAP34XX_CLKSTCTRL_ENABLE_AUTO, part, inst, cdoffs);
}
/**
* omap4_cminst_clkdm_disable_hwsup - put a clockdomain in swsup-idle mode
* @part: PRCM partition ID that the clockdomain registers exist in
* @inst: CM instance register offset (*_INST macro)
* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
*
* Put a clockdomain referred to by (@part, @inst, @cdoffs) into
* software-supervised idle mode, i.e., controlled manually by the
* Linux OMAP clockdomain code. No return value.
*/
void omap4_cminst_clkdm_disable_hwsup(u8 part, s16 inst, u16 cdoffs)
{
_clktrctrl_write(OMAP34XX_CLKSTCTRL_DISABLE_AUTO, part, inst, cdoffs);
}
/**
* omap4_cminst_clkdm_force_sleep - try to put a clockdomain into idle
* @part: PRCM partition ID that the clockdomain registers exist in
* @inst: CM instance register offset (*_INST macro)
* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
*
* Put a clockdomain referred to by (@part, @inst, @cdoffs) into idle
* No return value.
*/
void omap4_cminst_clkdm_force_sleep(u8 part, s16 inst, u16 cdoffs)
{
_clktrctrl_write(OMAP34XX_CLKSTCTRL_FORCE_SLEEP, part, inst, cdoffs);
}
/**
* omap4_cminst_clkdm_force_sleep - try to take a clockdomain out of idle
* @part: PRCM partition ID that the clockdomain registers exist in
* @inst: CM instance register offset (*_INST macro)
* @cdoffs: Clockdomain register offset (*_CDOFFS macro)
*
* Take a clockdomain referred to by (@part, @inst, @cdoffs) out of idle,
* waking it up. No return value.
*/
void omap4_cminst_clkdm_force_wakeup(u8 part, s16 inst, u16 cdoffs)
{
_clktrctrl_write(OMAP34XX_CLKSTCTRL_FORCE_WAKEUP, part, inst, cdoffs);
}
/*
*
*/
/**
* 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)
*
* 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_cminst_wait_module_idle(u8 part, u16 inst, s16 cdoffs, u16 clkctrl_offs)
{
int i = 0;
if (!clkctrl_offs)
return 0;
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);
}
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