mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
125 lines
4.1 KiB
C
125 lines
4.1 KiB
C
![]() |
/*
|
||
|
* OMAP3517/3505-specific clock framework functions
|
||
|
*
|
||
|
* Copyright (C) 2010 Texas Instruments, Inc.
|
||
|
* Copyright (C) 2010 Nokia Corporation
|
||
|
*
|
||
|
* Ranjith Lohithakshan
|
||
|
* Paul Walmsley
|
||
|
*
|
||
|
* Parts of this code are based on code written by
|
||
|
* Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu,
|
||
|
* Russell King
|
||
|
*
|
||
|
* 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.
|
||
|
*/
|
||
|
#undef DEBUG
|
||
|
|
||
|
#include <linux/kernel.h>
|
||
|
#include <linux/clk.h>
|
||
|
#include <linux/io.h>
|
||
|
|
||
|
#include <plat/clock.h>
|
||
|
|
||
|
#include "clock.h"
|
||
|
#include "clock3517.h"
|
||
|
#include "cm.h"
|
||
|
#include "cm-regbits-34xx.h"
|
||
|
|
||
|
/*
|
||
|
* In AM35xx IPSS, the {ICK,FCK} enable bits for modules are exported
|
||
|
* in the same register at a bit offset of 0x8. The EN_ACK for ICK is
|
||
|
* at an offset of 4 from ICK enable bit.
|
||
|
*/
|
||
|
#define AM35XX_IPSS_ICK_MASK 0xF
|
||
|
#define AM35XX_IPSS_ICK_EN_ACK_OFFSET 0x4
|
||
|
#define AM35XX_IPSS_ICK_FCK_OFFSET 0x8
|
||
|
#define AM35XX_IPSS_CLK_IDLEST_VAL 0
|
||
|
|
||
|
/**
|
||
|
* am35xx_clk_find_idlest - return clock ACK info for AM35XX IPSS
|
||
|
* @clk: struct clk * being enabled
|
||
|
* @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
|
||
|
* @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
|
||
|
* @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
|
||
|
*
|
||
|
* The interface clocks on AM35xx IPSS reflects the clock idle status
|
||
|
* in the enable register itsel at a bit offset of 4 from the enable
|
||
|
* bit. A value of 1 indicates that clock is enabled.
|
||
|
*/
|
||
|
static void am35xx_clk_find_idlest(struct clk *clk,
|
||
|
void __iomem **idlest_reg,
|
||
|
u8 *idlest_bit,
|
||
|
u8 *idlest_val)
|
||
|
{
|
||
|
*idlest_reg = (__force void __iomem *)(clk->enable_reg);
|
||
|
*idlest_bit = clk->enable_bit + AM35XX_IPSS_ICK_EN_ACK_OFFSET;
|
||
|
*idlest_val = AM35XX_IPSS_CLK_IDLEST_VAL;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* am35xx_clk_find_companion - find companion clock to @clk
|
||
|
* @clk: struct clk * to find the companion clock of
|
||
|
* @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in
|
||
|
* @other_bit: u8 ** to return the companion clock bit shift in
|
||
|
*
|
||
|
* Some clocks don't have companion clocks. For example, modules with
|
||
|
* only an interface clock (such as HECC) don't have a companion
|
||
|
* clock. Right now, this code relies on the hardware exporting a bit
|
||
|
* in the correct companion register that indicates that the
|
||
|
* nonexistent 'companion clock' is active. Future patches will
|
||
|
* associate this type of code with per-module data structures to
|
||
|
* avoid this issue, and remove the casts. No return value.
|
||
|
*/
|
||
|
static void am35xx_clk_find_companion(struct clk *clk, void __iomem **other_reg,
|
||
|
u8 *other_bit)
|
||
|
{
|
||
|
*other_reg = (__force void __iomem *)(clk->enable_reg);
|
||
|
if (clk->enable_bit & AM35XX_IPSS_ICK_MASK)
|
||
|
*other_bit = clk->enable_bit + AM35XX_IPSS_ICK_FCK_OFFSET;
|
||
|
else
|
||
|
*other_bit = clk->enable_bit - AM35XX_IPSS_ICK_FCK_OFFSET;
|
||
|
}
|
||
|
|
||
|
const struct clkops clkops_am35xx_ipss_module_wait = {
|
||
|
.enable = omap2_dflt_clk_enable,
|
||
|
.disable = omap2_dflt_clk_disable,
|
||
|
.find_idlest = am35xx_clk_find_idlest,
|
||
|
.find_companion = am35xx_clk_find_companion,
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* am35xx_clk_ipss_find_idlest - return CM_IDLEST info for IPSS
|
||
|
* @clk: struct clk * being enabled
|
||
|
* @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
|
||
|
* @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
|
||
|
* @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
|
||
|
*
|
||
|
* The IPSS target CM_IDLEST bit is at a different shift from the
|
||
|
* CM_{I,F}CLKEN bit. Pass back the correct info via @idlest_reg
|
||
|
* and @idlest_bit. No return value.
|
||
|
*/
|
||
|
static void am35xx_clk_ipss_find_idlest(struct clk *clk,
|
||
|
void __iomem **idlest_reg,
|
||
|
u8 *idlest_bit,
|
||
|
u8 *idlest_val)
|
||
|
{
|
||
|
u32 r;
|
||
|
|
||
|
r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
|
||
|
*idlest_reg = (__force void __iomem *)r;
|
||
|
*idlest_bit = AM35XX_ST_IPSS_SHIFT;
|
||
|
*idlest_val = OMAP34XX_CM_IDLEST_VAL;
|
||
|
}
|
||
|
|
||
|
const struct clkops clkops_am35xx_ipss_wait = {
|
||
|
.enable = omap2_dflt_clk_enable,
|
||
|
.disable = omap2_dflt_clk_disable,
|
||
|
.find_idlest = am35xx_clk_ipss_find_idlest,
|
||
|
.find_companion = omap2_clk_dflt_find_companion,
|
||
|
};
|
||
|
|
||
|
|