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OMAP2 clock: 2430 I2CHS uses non-standard CM_IDLEST register 

OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the CM_*CLKEN bits
are in CM_{I,F}CLKEN2_CORE [1].  Fix by implementing a custom clkops
.find_idlest function to return the correct slave IDLEST register.

...

1. OMAP2430 Multimedia Device Package-on-Package (POP) Silicon Revision 2.1
   (Rev. V) Technical Reference Manual, tables 4-99 and 4-105.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Paul Walmsley 2009-07-24 19:44:04 -06:00 committed by paul
parent 72350b29a4
commit 3dc2197579
2 changed files with 37 additions and 4 deletions
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37
arch/arm/mach-omap2/clock24xx.c
View File

@ -30,6 +30,7 @@
#include <mach/clock.h>
#include <mach/sram.h>
#include <mach/prcm.h>
#include <asm/div64.h>
#include <asm/clkdev.h>
@ -43,6 +44,18 @@
static const struct clkops clkops_oscck;
static const struct clkops clkops_fixed;
static void omap2430_clk_i2chs_find_idlest(struct clk *clk,
void __iomem **idlest_reg,
u8 *idlest_bit);
/* 2430 I2CHS has non-standard IDLEST register */
static const struct clkops clkops_omap2430_i2chs_wait = {
.enable = omap2_dflt_clk_enable,
.disable = omap2_dflt_clk_disable,
.find_idlest = omap2430_clk_i2chs_find_idlest,
.find_companion = omap2_clk_dflt_find_companion,
};
#include "clock24xx.h"
struct omap_clk {
@ -239,6 +252,26 @@ static void __iomem *prcm_clksrc_ctrl;
* Omap24xx specific clock functions
*-------------------------------------------------------------------------*/
/**
* omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
* @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
*
* OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
* CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function
* passes back the correct CM_IDLEST register address for I2CHS
* modules. No return value.
*/
static void omap2430_clk_i2chs_find_idlest(struct clk *clk,
void __iomem **idlest_reg,
u8 *idlest_bit)
{
*idlest_reg = OMAP_CM_REGADDR(CORE_MOD, CM_IDLEST);
*idlest_bit = clk->enable_bit;
}
/**
* omap2xxx_clk_get_core_rate - return the CORE_CLK rate
* @clk: pointer to the combined dpll_ck + core_ck (currently "dpll_ck")
@ -325,8 +358,8 @@ static int omap2_clk_fixed_enable(struct clk *clk)
else if (clk == &apll54_ck)
cval = OMAP24XX_ST_54M_APLL;
omap2_wait_clock_ready(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), cval,
clk->name);
omap2_cm_wait_idlest(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), cval,
clk->name);
/*
* REVISIT: Should we return an error code if omap2_wait_clock_ready()

4
arch/arm/mach-omap2/clock24xx.h
View File

@ -2337,7 +2337,7 @@ static struct clk i2c2_fck = {
static struct clk i2chs2_fck = {
.name = "i2c_fck",
.ops = &clkops_omap2_dflt_wait,
.ops = &clkops_omap2430_i2chs_wait,
.id = 2,
.parent = &func_96m_ck,
.clkdm_name = "core_l4_clkdm",
@ -2370,7 +2370,7 @@ static struct clk i2c1_fck = {
static struct clk i2chs1_fck = {
.name = "i2c_fck",
.ops = &clkops_omap2_dflt_wait,
.ops = &clkops_omap2430_i2chs_wait,
.id = 1,
.parent = &func_96m_ck,
.clkdm_name = "core_l4_clkdm",