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linux-sg2042/arch/arm/mach-u300/clock.c

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/*
*
* arch/arm/mach-u300/clock.c
*
*
* Copyright (C) 2007-2009 ST-Ericsson AB
* License terms: GNU General Public License (GPL) version 2
* Define clocks in the app platform.
* Author: Linus Walleij <linus.walleij@stericsson.com>
* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/clk.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/io.h>
#include <linux/seq_file.h>
#include <linux/clkdev.h>
#include <mach/hardware.h>
#include <mach/syscon.h>
#include "clock.h"
/*
* TODO:
* - move all handling of the CCR register into this file and create
* a spinlock for the CCR register
* - switch to the clkdevice lookup mechanism that maps clocks to
* device ID:s instead when it becomes available in kernel 2.6.29.
* - implement rate get/set for all clocks that need it.
*/
/*
* Syscon clock I/O registers lock so clock requests don't collide
* NOTE: this is a local lock only used to lock access to clock and
* reset registers in syscon.
*/
static DEFINE_SPINLOCK(syscon_clkreg_lock);
static DEFINE_SPINLOCK(syscon_resetreg_lock);
/*
* The clocking hierarchy currently looks like this.
* NOTE: the idea is NOT to show how the clocks are routed on the chip!
* The ideas is to show dependencies, so a clock higher up in the
* hierarchy has to be on in order for another clock to be on. Now,
* both CPU and DMA can actually be on top of the hierarchy, and that
* is not modeled currently. Instead we have the backbone AMBA bus on
* top. This bus cannot be programmed in any way but conceptually it
* needs to be active for the bridges and devices to transport data.
*
* Please be aware that a few clocks are hw controlled, which mean that
* the hw itself can turn on/off or change the rate of the clock when
* needed!
*
* AMBA bus
* |
* +- CPU
* +- FSMC NANDIF NAND Flash interface
* +- SEMI Shared Memory interface
* +- ISP Image Signal Processor (U335 only)
* +- CDS (U335 only)
* +- DMA Direct Memory Access Controller
* +- AAIF APP/ACC Inteface (Mobile Scalable Link, MSL)
* +- APEX
* +- VIDEO_ENC AVE2/3 Video Encoder
* +- XGAM Graphics Accelerator Controller
* +- AHB
* |
* +- ahb:0 AHB Bridge
* | |
* | +- ahb:1 INTCON Interrupt controller
* | +- ahb:3 MSPRO Memory Stick Pro controller
* | +- ahb:4 EMIF External Memory interface
* |
* +- fast:0 FAST bridge
* | |
* | +- fast:1 MMCSD MMC/SD card reader controller
* | +- fast:2 I2S0 PCM I2S channel 0 controller
* | +- fast:3 I2S1 PCM I2S channel 1 controller
* | +- fast:4 I2C0 I2C channel 0 controller
* | +- fast:5 I2C1 I2C channel 1 controller
* | +- fast:6 SPI SPI controller
* | +- fast:7 UART1 Secondary UART (U335 only)
* |
* +- slow:0 SLOW bridge
* |
* +- slow:1 SYSCON (not possible to control)
* +- slow:2 WDOG Watchdog
* +- slow:3 UART0 primary UART
* +- slow:4 TIMER_APP Application timer - used in Linux
* +- slow:5 KEYPAD controller
* +- slow:6 GPIO controller
* +- slow:7 RTC controller
* +- slow:8 BT Bus Tracer (not used currently)
* +- slow:9 EH Event Handler (not used currently)
* +- slow:a TIMER_ACC Access style timer (not used currently)
* +- slow:b PPM (U335 only, what is that?)
*/
/*
* Reset control functions. We remember if a block has been
* taken out of reset and don't remove the reset assertion again
* and vice versa. Currently we only remove resets so the
* enablement function is defined out.
*/
static void syscon_block_reset_enable(struct clk *clk)
{
u16 val;
unsigned long iflags;
/* Not all blocks support resetting */
if (!clk->res_reg || !clk->res_mask)
return;
spin_lock_irqsave(&syscon_resetreg_lock, iflags);
val = readw(clk->res_reg);
val |= clk->res_mask;
writew(val, clk->res_reg);
spin_unlock_irqrestore(&syscon_resetreg_lock, iflags);
clk->reset = true;
}
static void syscon_block_reset_disable(struct clk *clk)
{
u16 val;
unsigned long iflags;
/* Not all blocks support resetting */
if (!clk->res_reg || !clk->res_mask)
return;
spin_lock_irqsave(&syscon_resetreg_lock, iflags);
val = readw(clk->res_reg);
val &= ~clk->res_mask;
writew(val, clk->res_reg);
spin_unlock_irqrestore(&syscon_resetreg_lock, iflags);
clk->reset = false;
}
int __clk_get(struct clk *clk)
{
u16 val;
/* The MMC and MSPRO clocks need some special set-up */
if (!strcmp(clk->name, "MCLK")) {
/* Set default MMC clock divisor to 18.9 MHz */
writew(0x0054U, U300_SYSCON_VBASE + U300_SYSCON_MMF0R);
val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMCR);
/* Disable the MMC feedback clock */
val &= ~U300_SYSCON_MMCR_MMC_FB_CLK_SEL_ENABLE;
/* Disable MSPRO frequency */
val &= ~U300_SYSCON_MMCR_MSPRO_FREQSEL_ENABLE;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_MMCR);
}
if (!strcmp(clk->name, "MSPRO")) {
val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMCR);
/* Disable the MMC feedback clock */
val &= ~U300_SYSCON_MMCR_MMC_FB_CLK_SEL_ENABLE;
/* Enable MSPRO frequency */
val |= U300_SYSCON_MMCR_MSPRO_FREQSEL_ENABLE;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_MMCR);
}
return 1;
}
EXPORT_SYMBOL(__clk_get);
void __clk_put(struct clk *clk)
{
}
EXPORT_SYMBOL(__clk_put);
static void syscon_clk_disable(struct clk *clk)
{
unsigned long iflags;
/* Don't touch the hardware controlled clocks */
if (clk->hw_ctrld)
return;
spin_lock_irqsave(&syscon_clkreg_lock, iflags);
writew(clk->clk_val, U300_SYSCON_VBASE + U300_SYSCON_SBCDR);
spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
}
static void syscon_clk_enable(struct clk *clk)
{
unsigned long iflags;
/* Don't touch the hardware controlled clocks */
if (clk->hw_ctrld)
return;
spin_lock_irqsave(&syscon_clkreg_lock, iflags);
writew(clk->clk_val, U300_SYSCON_VBASE + U300_SYSCON_SBCER);
spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
}
static u16 syscon_clk_get_rate(void)
{
u16 val;
unsigned long iflags;
spin_lock_irqsave(&syscon_clkreg_lock, iflags);
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
val &= U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK;
spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
return val;
}
#ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
static void enable_i2s0_vcxo(void)
{
u16 val;
unsigned long iflags;
spin_lock_irqsave(&syscon_clkreg_lock, iflags);
/* Set I2S0 to use the VCXO 26 MHz clock */
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
val |= U300_SYSCON_CCR_TURN_VCXO_ON;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
val |= U300_SYSCON_CCR_I2S0_USE_VCXO;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
val |= U300_SYSCON_CEFR_I2S0_CLK_EN;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
}
static void enable_i2s1_vcxo(void)
{
u16 val;
unsigned long iflags;
spin_lock_irqsave(&syscon_clkreg_lock, iflags);
/* Set I2S1 to use the VCXO 26 MHz clock */
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
val |= U300_SYSCON_CCR_TURN_VCXO_ON;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
val |= U300_SYSCON_CCR_I2S1_USE_VCXO;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
val |= U300_SYSCON_CEFR_I2S1_CLK_EN;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
}
static void disable_i2s0_vcxo(void)
{
u16 val;
unsigned long iflags;
spin_lock_irqsave(&syscon_clkreg_lock, iflags);
/* Disable I2S0 use of the VCXO 26 MHz clock */
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
val &= ~U300_SYSCON_CCR_I2S0_USE_VCXO;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
/* Deactivate VCXO if no one else is using VCXO */
if (!(val & U300_SYSCON_CCR_I2S1_USE_VCXO))
val &= ~U300_SYSCON_CCR_TURN_VCXO_ON;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
val &= ~U300_SYSCON_CEFR_I2S0_CLK_EN;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
}
static void disable_i2s1_vcxo(void)
{
u16 val;
unsigned long iflags;
spin_lock_irqsave(&syscon_clkreg_lock, iflags);
/* Disable I2S1 use of the VCXO 26 MHz clock */
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
val &= ~U300_SYSCON_CCR_I2S1_USE_VCXO;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
/* Deactivate VCXO if no one else is using VCXO */
if (!(val & U300_SYSCON_CCR_I2S0_USE_VCXO))
val &= ~U300_SYSCON_CCR_TURN_VCXO_ON;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
val &= ~U300_SYSCON_CEFR_I2S0_CLK_EN;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
}
#endif /* CONFIG_MACH_U300_USE_I2S_AS_MASTER */
static void syscon_clk_rate_set_mclk(unsigned long rate)
{
u16 val;
u32 reg;
unsigned long iflags;
switch (rate) {
case 18900000:
val = 0x0054;
break;
case 20800000:
val = 0x0044;
break;
case 23100000:
val = 0x0043;
break;
case 26000000:
val = 0x0033;
break;
case 29700000:
val = 0x0032;
break;
case 34700000:
val = 0x0022;
break;
case 41600000:
val = 0x0021;
break;
case 52000000:
val = 0x0011;
break;
case 104000000:
val = 0x0000;
break;
default:
printk(KERN_ERR "Trying to set MCLK to unknown speed! %ld\n",
rate);
return;
}
spin_lock_irqsave(&syscon_clkreg_lock, iflags);
reg = readw(U300_SYSCON_VBASE + U300_SYSCON_MMF0R) &
~U300_SYSCON_MMF0R_MASK;
writew(reg | val, U300_SYSCON_VBASE + U300_SYSCON_MMF0R);
spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
}
void syscon_clk_rate_set_cpuclk(unsigned long rate)
{
u16 val;
unsigned long iflags;
switch (rate) {
case 13000000:
val = U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER;
break;
case 52000000:
val = U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE;
break;
case 104000000:
val = U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH;
break;
case 208000000:
val = U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST;
break;
default:
return;
}
spin_lock_irqsave(&syscon_clkreg_lock, iflags);
val |= readw(U300_SYSCON_VBASE + U300_SYSCON_CCR) &
~U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK ;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
}
EXPORT_SYMBOL(syscon_clk_rate_set_cpuclk);
void clk_disable(struct clk *clk)
{
unsigned long iflags;
spin_lock_irqsave(&clk->lock, iflags);
if (clk->usecount > 0 && !(--clk->usecount)) {
/* some blocks lack clocking registers and cannot be disabled */
if (clk->disable)
clk->disable(clk);
if (likely((u32)clk->parent))
clk_disable(clk->parent);
}
#ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
if (unlikely(!strcmp(clk->name, "I2S0")))
disable_i2s0_vcxo();
if (unlikely(!strcmp(clk->name, "I2S1")))
disable_i2s1_vcxo();
#endif
spin_unlock_irqrestore(&clk->lock, iflags);
}
EXPORT_SYMBOL(clk_disable);
int clk_enable(struct clk *clk)
{
int ret = 0;
unsigned long iflags;
spin_lock_irqsave(&clk->lock, iflags);
if (clk->usecount++ == 0) {
if (likely((u32)clk->parent))
ret = clk_enable(clk->parent);
if (unlikely(ret != 0))
clk->usecount--;
else {
/* remove reset line (we never enable reset again) */
syscon_block_reset_disable(clk);
/* clocks without enable function are always on */
if (clk->enable)
clk->enable(clk);
#ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
if (unlikely(!strcmp(clk->name, "I2S0")))
enable_i2s0_vcxo();
if (unlikely(!strcmp(clk->name, "I2S1")))
enable_i2s1_vcxo();
#endif
}
}
spin_unlock_irqrestore(&clk->lock, iflags);
return ret;
}
EXPORT_SYMBOL(clk_enable);
/* Returns the clock rate in Hz */
static unsigned long clk_get_rate_cpuclk(struct clk *clk)
{
u16 val;
val = syscon_clk_get_rate();
switch (val) {
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
return 13000000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
return 52000000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
return 104000000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
return 208000000;
default:
break;
}
return clk->rate;
}
static unsigned long clk_get_rate_ahb_clk(struct clk *clk)
{
u16 val;
val = syscon_clk_get_rate();
switch (val) {
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
return 6500000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
return 26000000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
return 52000000;
default:
break;
}
return clk->rate;
}
static unsigned long clk_get_rate_emif_clk(struct clk *clk)
{
u16 val;
val = syscon_clk_get_rate();
switch (val) {
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
return 13000000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
return 52000000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
return 104000000;
default:
break;
}
return clk->rate;
}
static unsigned long clk_get_rate_xgamclk(struct clk *clk)
{
u16 val;
val = syscon_clk_get_rate();
switch (val) {
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
return 6500000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
return 26000000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
return 52000000;
default:
break;
}
return clk->rate;
}
static unsigned long clk_get_rate_mclk(struct clk *clk)
{
u16 val;
val = syscon_clk_get_rate();
switch (val) {
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
/*
* Here, the 208 MHz PLL gets shut down and the always
* on 13 MHz PLL used for RTC etc kicks into use
* instead.
*/
return 13000000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
{
/*
* This clock is under program control. The register is
* divided in two nybbles, bit 7-4 gives cycles-1 to count
* high, bit 3-0 gives cycles-1 to count low. Distribute
* these with no more than 1 cycle difference between
* low and high and add low and high to get the actual
* divisor. The base PLL is 208 MHz. Writing 0x00 will
* divide by 1 and 1 so the highest frequency possible
* is 104 MHz.
*
* e.g. 0x54 =>
* f = 208 / ((5+1) + (4+1)) = 208 / 11 = 18.9 MHz
*/
u16 val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMF0R) &
U300_SYSCON_MMF0R_MASK;
switch (val) {
case 0x0054:
return 18900000;
case 0x0044:
return 20800000;
case 0x0043:
return 23100000;
case 0x0033:
return 26000000;
case 0x0032:
return 29700000;
case 0x0022:
return 34700000;
case 0x0021:
return 41600000;
case 0x0011:
return 52000000;
case 0x0000:
return 104000000;
default:
break;
}
}
default:
break;
}
return clk->rate;
}
static unsigned long clk_get_rate_i2s_i2c_spi(struct clk *clk)
{
u16 val;
val = syscon_clk_get_rate();
switch (val) {
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
return 13000000;
case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
return 26000000;
default:
break;
}
return clk->rate;
}
unsigned long clk_get_rate(struct clk *clk)
{
if (clk->get_rate)
return clk->get_rate(clk);
else
return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);
static unsigned long clk_round_rate_mclk(struct clk *clk, unsigned long rate)
{
if (rate <= 18900000)
return 18900000;
if (rate <= 20800000)
return 20800000;
if (rate <= 23100000)
return 23100000;
if (rate <= 26000000)
return 26000000;
if (rate <= 29700000)
return 29700000;
if (rate <= 34700000)
return 34700000;
if (rate <= 41600000)
return 41600000;
if (rate <= 52000000)
return 52000000;
return -EINVAL;
}
static unsigned long clk_round_rate_cpuclk(struct clk *clk, unsigned long rate)
{
if (rate <= 13000000)
return 13000000;
if (rate <= 52000000)
return 52000000;
if (rate <= 104000000)
return 104000000;
if (rate <= 208000000)
return 208000000;
return -EINVAL;
}
/*
* This adjusts a requested rate to the closest exact rate
* a certain clock can provide. For a fixed clock it's
* mostly clk->rate.
*/
long clk_round_rate(struct clk *clk, unsigned long rate)
{
/* TODO: get appropriate switches for EMIFCLK, AHBCLK and MCLK */
/* Else default to fixed value */
if (clk->round_rate) {
return (long) clk->round_rate(clk, rate);
} else {
printk(KERN_ERR "clock: Failed to round rate of %s\n",
clk->name);
}
return (long) clk->rate;
}
EXPORT_SYMBOL(clk_round_rate);
static int clk_set_rate_mclk(struct clk *clk, unsigned long rate)
{
syscon_clk_rate_set_mclk(clk_round_rate(clk, rate));
return 0;
}
static int clk_set_rate_cpuclk(struct clk *clk, unsigned long rate)
{
syscon_clk_rate_set_cpuclk(clk_round_rate(clk, rate));
return 0;
}
int clk_set_rate(struct clk *clk, unsigned long rate)
{
/* TODO: set for EMIFCLK and AHBCLK */
/* Else assume the clock is fixed and fail */
if (clk->set_rate) {
return clk->set_rate(clk, rate);
} else {
printk(KERN_ERR "clock: Failed to set %s to %ld hz\n",
clk->name, rate);
return -EINVAL;
}
}
EXPORT_SYMBOL(clk_set_rate);
/*
* Clock definitions. The clock parents are set to respective
* bridge and the clock framework makes sure that the clocks have
* parents activated and are brought out of reset when in use.
*
* Clocks that have hw_ctrld = true are hw controlled, and the hw
* can by itself turn these clocks on and off.
* So in other words, we don't really have to care about them.
*/
static struct clk amba_clk = {
.name = "AMBA",
.rate = 52000000, /* this varies! */
.hw_ctrld = true,
.reset = false,
.lock = __SPIN_LOCK_UNLOCKED(amba_clk.lock),
};
/*
* These blocks are connected directly to the AMBA bus
* with no bridge.
*/
static struct clk cpu_clk = {
.name = "CPU",
.parent = &amba_clk,
.rate = 208000000, /* this varies! */
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_CPU_RESET_EN,
.set_rate = clk_set_rate_cpuclk,
.get_rate = clk_get_rate_cpuclk,
.round_rate = clk_round_rate_cpuclk,
.lock = __SPIN_LOCK_UNLOCKED(cpu_clk.lock),
};
static struct clk nandif_clk = {
.name = "FSMC",
.parent = &amba_clk,
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_NANDIF_RESET_EN,
.clk_val = U300_SYSCON_SBCER_NANDIF_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(nandif_clk.lock),
};
static struct clk semi_clk = {
.name = "SEMI",
.parent = &amba_clk,
.rate = 0, /* FIXME */
/* It is not possible to reset SEMI */
.hw_ctrld = false,
.reset = false,
.clk_val = U300_SYSCON_SBCER_SEMI_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(semi_clk.lock),
};
#ifdef CONFIG_MACH_U300_BS335
static struct clk isp_clk = {
.name = "ISP",
.parent = &amba_clk,
.rate = 0, /* FIXME */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_ISP_RESET_EN,
.clk_val = U300_SYSCON_SBCER_ISP_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(isp_clk.lock),
};
static struct clk cds_clk = {
.name = "CDS",
.parent = &amba_clk,
.rate = 0, /* FIXME */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_CDS_RESET_EN,
.clk_val = U300_SYSCON_SBCER_CDS_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(cds_clk.lock),
};
#endif
static struct clk dma_clk = {
.name = "DMA",
.parent = &amba_clk,
.rate = 52000000, /* this varies! */
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_DMAC_RESET_EN,
.clk_val = U300_SYSCON_SBCER_DMAC_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(dma_clk.lock),
};
static struct clk aaif_clk = {
.name = "AAIF",
.parent = &amba_clk,
.rate = 52000000, /* this varies! */
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_AAIF_RESET_EN,
.clk_val = U300_SYSCON_SBCER_AAIF_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(aaif_clk.lock),
};
static struct clk apex_clk = {
.name = "APEX",
.parent = &amba_clk,
.rate = 0, /* FIXME */
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_APEX_RESET_EN,
.clk_val = U300_SYSCON_SBCER_APEX_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(apex_clk.lock),
};
static struct clk video_enc_clk = {
.name = "VIDEO_ENC",
.parent = &amba_clk,
.rate = 208000000, /* this varies! */
.hw_ctrld = false,
.reset = false,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
/* This has XGAM in the name but refers to the video encoder */
.res_mask = U300_SYSCON_RRR_XGAM_VC_SYNC_RESET_EN,
.clk_val = U300_SYSCON_SBCER_VIDEO_ENC_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(video_enc_clk.lock),
};
static struct clk xgam_clk = {
.name = "XGAMCLK",
.parent = &amba_clk,
.rate = 52000000, /* this varies! */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_XGAM_RESET_EN,
.clk_val = U300_SYSCON_SBCER_XGAM_CLK_EN,
.get_rate = clk_get_rate_xgamclk,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(xgam_clk.lock),
};
/* This clock is used to activate the video encoder */
static struct clk ahb_clk = {
.name = "AHB",
.parent = &amba_clk,
.rate = 52000000, /* this varies! */
.hw_ctrld = false, /* This one is set to false due to HW bug */
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_AHB_RESET_EN,
.clk_val = U300_SYSCON_SBCER_AHB_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.get_rate = clk_get_rate_ahb_clk,
.lock = __SPIN_LOCK_UNLOCKED(ahb_clk.lock),
};
/*
* Clocks on the AHB bridge
*/
static struct clk ahb_subsys_clk = {
.name = "AHB_SUBSYS",
.parent = &amba_clk,
.rate = 52000000, /* this varies! */
.hw_ctrld = true,
.reset = false,
.clk_val = U300_SYSCON_SBCER_AHB_SUBSYS_BRIDGE_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.get_rate = clk_get_rate_ahb_clk,
.lock = __SPIN_LOCK_UNLOCKED(ahb_subsys_clk.lock),
};
static struct clk intcon_clk = {
.name = "INTCON",
.parent = &ahb_subsys_clk,
.rate = 52000000, /* this varies! */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_INTCON_RESET_EN,
/* INTCON can be reset but not clock-gated */
.lock = __SPIN_LOCK_UNLOCKED(intcon_clk.lock),
};
static struct clk mspro_clk = {
.name = "MSPRO",
.parent = &ahb_subsys_clk,
.rate = 0, /* FIXME */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_MSPRO_RESET_EN,
.clk_val = U300_SYSCON_SBCER_MSPRO_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(mspro_clk.lock),
};
static struct clk emif_clk = {
.name = "EMIF",
.parent = &ahb_subsys_clk,
.rate = 104000000, /* this varies! */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
.res_mask = U300_SYSCON_RRR_EMIF_RESET_EN,
.clk_val = U300_SYSCON_SBCER_EMIF_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.get_rate = clk_get_rate_emif_clk,
.lock = __SPIN_LOCK_UNLOCKED(emif_clk.lock),
};
/*
* Clocks on the FAST bridge
*/
static struct clk fast_clk = {
.name = "FAST_BRIDGE",
.parent = &amba_clk,
.rate = 13000000, /* this varies! */
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
.res_mask = U300_SYSCON_RFR_FAST_BRIDGE_RESET_ENABLE,
.clk_val = U300_SYSCON_SBCER_FAST_BRIDGE_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(fast_clk.lock),
};
/*
* The MMCI apb_pclk is hardwired to the same terminal as the
* external MCI clock. Thus this will be referenced twice.
*/
static struct clk mmcsd_clk = {
.name = "MCLK",
.parent = &fast_clk,
.rate = 18900000, /* this varies! */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
.res_mask = U300_SYSCON_RFR_MMC_RESET_ENABLE,
.clk_val = U300_SYSCON_SBCER_MMC_CLK_EN,
.get_rate = clk_get_rate_mclk,
.set_rate = clk_set_rate_mclk,
.round_rate = clk_round_rate_mclk,
.disable = syscon_clk_disable,
.enable = syscon_clk_enable,
.lock = __SPIN_LOCK_UNLOCKED(mmcsd_clk.lock),
};
static struct clk i2s0_clk = {
.name = "i2s0",
.parent = &fast_clk,
.rate = 26000000, /* this varies! */
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
.res_mask = U300_SYSCON_RFR_PCM_I2S0_RESET_ENABLE,
.clk_val = U300_SYSCON_SBCER_I2S0_CORE_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.get_rate = clk_get_rate_i2s_i2c_spi,
.lock = __SPIN_LOCK_UNLOCKED(i2s0_clk.lock),
};
static struct clk i2s1_clk = {
.name = "i2s1",
.parent = &fast_clk,
.rate = 26000000, /* this varies! */
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
.res_mask = U300_SYSCON_RFR_PCM_I2S1_RESET_ENABLE,
.clk_val = U300_SYSCON_SBCER_I2S1_CORE_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.get_rate = clk_get_rate_i2s_i2c_spi,
.lock = __SPIN_LOCK_UNLOCKED(i2s1_clk.lock),
};
static struct clk i2c0_clk = {
.name = "I2C0",
.parent = &fast_clk,
.rate = 26000000, /* this varies! */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
.res_mask = U300_SYSCON_RFR_I2C0_RESET_ENABLE,
.clk_val = U300_SYSCON_SBCER_I2C0_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.get_rate = clk_get_rate_i2s_i2c_spi,
.lock = __SPIN_LOCK_UNLOCKED(i2c0_clk.lock),
};
static struct clk i2c1_clk = {
.name = "I2C1",
.parent = &fast_clk,
.rate = 26000000, /* this varies! */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
.res_mask = U300_SYSCON_RFR_I2C1_RESET_ENABLE,
.clk_val = U300_SYSCON_SBCER_I2C1_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.get_rate = clk_get_rate_i2s_i2c_spi,
.lock = __SPIN_LOCK_UNLOCKED(i2c1_clk.lock),
};
/*
* The SPI apb_pclk is hardwired to the same terminal as the
* external SPI clock. Thus this will be referenced twice.
*/
static struct clk spi_clk = {
.name = "SPI",
.parent = &fast_clk,
.rate = 26000000, /* this varies! */
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
.res_mask = U300_SYSCON_RFR_SPI_RESET_ENABLE,
.clk_val = U300_SYSCON_SBCER_SPI_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.get_rate = clk_get_rate_i2s_i2c_spi,
.lock = __SPIN_LOCK_UNLOCKED(spi_clk.lock),
};
#ifdef CONFIG_MACH_U300_BS335
static struct clk uart1_pclk = {
.name = "UART1_PCLK",
.parent = &fast_clk,
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
.res_mask = U300_SYSCON_RFR_UART1_RESET_ENABLE,
.clk_val = U300_SYSCON_SBCER_UART1_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(uart1_pclk.lock),
};
/* This one is hardwired to PLL13 */
static struct clk uart1_clk = {
.name = "UART1_CLK",
.rate = 13000000,
.hw_ctrld = true,
.lock = __SPIN_LOCK_UNLOCKED(uart1_clk.lock),
};
#endif
/*
* Clocks on the SLOW bridge
*/
static struct clk slow_clk = {
.name = "SLOW_BRIDGE",
.parent = &amba_clk,
.rate = 13000000,
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_SLOW_BRIDGE_RESET_EN,
.clk_val = U300_SYSCON_SBCER_SLOW_BRIDGE_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(slow_clk.lock),
};
/* TODO: implement SYSCON clock? */
static struct clk wdog_clk = {
.name = "WDOG",
.parent = &slow_clk,
.hw_ctrld = false,
.rate = 32768,
.reset = false,
/* This is always on, cannot be enabled/disabled or reset */
.lock = __SPIN_LOCK_UNLOCKED(wdog_clk.lock),
};
static struct clk uart0_pclk = {
.name = "UART0_PCLK",
.parent = &slow_clk,
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_UART_RESET_EN,
.clk_val = U300_SYSCON_SBCER_UART_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(uart0_pclk.lock),
};
/* This one is hardwired to PLL13 */
static struct clk uart0_clk = {
.name = "UART0_CLK",
.parent = &slow_clk,
.rate = 13000000,
.hw_ctrld = true,
.lock = __SPIN_LOCK_UNLOCKED(uart0_clk.lock),
};
static struct clk keypad_clk = {
.name = "KEYPAD",
.parent = &slow_clk,
.rate = 32768,
.hw_ctrld = false,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_KEYPAD_RESET_EN,
.clk_val = U300_SYSCON_SBCER_KEYPAD_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(keypad_clk.lock),
};
static struct clk gpio_clk = {
.name = "GPIO",
.parent = &slow_clk,
.rate = 13000000,
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_GPIO_RESET_EN,
.clk_val = U300_SYSCON_SBCER_GPIO_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(gpio_clk.lock),
};
static struct clk rtc_clk = {
.name = "RTC",
.parent = &slow_clk,
.rate = 32768,
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_RTC_RESET_EN,
/* This clock is always on, cannot be enabled/disabled */
.lock = __SPIN_LOCK_UNLOCKED(rtc_clk.lock),
};
static struct clk bustr_clk = {
.name = "BUSTR",
.parent = &slow_clk,
.rate = 13000000,
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_BTR_RESET_EN,
.clk_val = U300_SYSCON_SBCER_BTR_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(bustr_clk.lock),
};
static struct clk evhist_clk = {
.name = "EVHIST",
.parent = &slow_clk,
.rate = 13000000,
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_EH_RESET_EN,
.clk_val = U300_SYSCON_SBCER_EH_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(evhist_clk.lock),
};
static struct clk timer_clk = {
.name = "TIMER",
.parent = &slow_clk,
.rate = 13000000,
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_ACC_TMR_RESET_EN,
.clk_val = U300_SYSCON_SBCER_ACC_TMR_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(timer_clk.lock),
};
/*
* There is a binary divider in the hardware that divides
* the 13MHz PLL by 13 down to 1 MHz.
*/
static struct clk app_timer_clk = {
.name = "TIMER_APP",
.parent = &slow_clk,
.rate = 1000000,
.hw_ctrld = true,
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_APP_TMR_RESET_EN,
.clk_val = U300_SYSCON_SBCER_APP_TMR_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(app_timer_clk.lock),
};
#ifdef CONFIG_MACH_U300_BS335
static struct clk ppm_clk = {
.name = "PPM",
.parent = &slow_clk,
.rate = 0, /* FIXME */
.hw_ctrld = true, /* TODO: Look up if it is hw ctrld or not */
.reset = true,
.res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
.res_mask = U300_SYSCON_RSR_PPM_RESET_EN,
.clk_val = U300_SYSCON_SBCER_PPM_CLK_EN,
.enable = syscon_clk_enable,
.disable = syscon_clk_disable,
.lock = __SPIN_LOCK_UNLOCKED(ppm_clk.lock),
};
#endif
#define DEF_LOOKUP(devid, clkref) \
{ \
.dev_id = devid, \
.clk = clkref, \
}
#define DEF_LOOKUP_CON(devid, conid, clkref) \
{ \
.dev_id = devid, \
.con_id = conid, \
.clk = clkref, \
}
/*
* Here we only define clocks that are meaningful to
* look up through clockdevice.
*/
static struct clk_lookup lookups[] = {
/* Connected directly to the AMBA bus */
DEF_LOOKUP("amba", &amba_clk),
DEF_LOOKUP("cpu", &cpu_clk),
DEF_LOOKUP("fsmc-nand", &nandif_clk),
DEF_LOOKUP("semi", &semi_clk),
#ifdef CONFIG_MACH_U300_BS335
DEF_LOOKUP("isp", &isp_clk),
DEF_LOOKUP("cds", &cds_clk),
#endif
DEF_LOOKUP("dma", &dma_clk),
DEF_LOOKUP("msl", &aaif_clk),
DEF_LOOKUP("apex", &apex_clk),
DEF_LOOKUP("video_enc", &video_enc_clk),
DEF_LOOKUP("xgam", &xgam_clk),
DEF_LOOKUP("ahb", &ahb_clk),
/* AHB bridge clocks */
DEF_LOOKUP("ahb_subsys", &ahb_subsys_clk),
DEF_LOOKUP("intcon", &intcon_clk),
DEF_LOOKUP_CON("intcon", "apb_pclk", &intcon_clk),
DEF_LOOKUP("mspro", &mspro_clk),
DEF_LOOKUP("pl172", &emif_clk),
DEF_LOOKUP_CON("pl172", "apb_pclk", &emif_clk),
/* FAST bridge clocks */
DEF_LOOKUP("fast", &fast_clk),
DEF_LOOKUP("mmci", &mmcsd_clk),
DEF_LOOKUP_CON("mmci", "apb_pclk", &mmcsd_clk),
/*
* The .0 and .1 identifiers on these comes from the platform device
* .id field and are assigned when the platform devices are registered.
*/
DEF_LOOKUP("i2s.0", &i2s0_clk),
DEF_LOOKUP("i2s.1", &i2s1_clk),
DEF_LOOKUP("stu300.0", &i2c0_clk),
DEF_LOOKUP("stu300.1", &i2c1_clk),
DEF_LOOKUP("pl022", &spi_clk),
DEF_LOOKUP_CON("pl022", "apb_pclk", &spi_clk),
#ifdef CONFIG_MACH_U300_BS335
DEF_LOOKUP("uart1", &uart1_clk),
DEF_LOOKUP_CON("uart1", "apb_pclk", &uart1_pclk),
#endif
/* SLOW bridge clocks */
DEF_LOOKUP("slow", &slow_clk),
DEF_LOOKUP("coh901327_wdog", &wdog_clk),
DEF_LOOKUP("uart0", &uart0_clk),
DEF_LOOKUP_CON("uart0", "apb_pclk", &uart0_pclk),
DEF_LOOKUP("apptimer", &app_timer_clk),
DEF_LOOKUP("coh901461-keypad", &keypad_clk),
DEF_LOOKUP("u300-gpio", &gpio_clk),
DEF_LOOKUP("rtc-coh901331", &rtc_clk),
DEF_LOOKUP("bustr", &bustr_clk),
DEF_LOOKUP("evhist", &evhist_clk),
DEF_LOOKUP("timer", &timer_clk),
#ifdef CONFIG_MACH_U300_BS335
DEF_LOOKUP("ppm", &ppm_clk),
#endif
};
static void __init clk_register(void)
{
/* Register the lookups */
clkdev_add_table(lookups, ARRAY_SIZE(lookups));
}
#if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_U300_DEBUG))
/*
* The following makes it possible to view the status (especially
* reference count and reset status) for the clocks in the platform
* by looking into the special file <debugfs>/u300_clocks
*/
/* A list of all clocks in the platform */
static struct clk *clks[] = {
/* Top node clock for the AMBA bus */
&amba_clk,
/* Connected directly to the AMBA bus */
&cpu_clk,
&nandif_clk,
&semi_clk,
#ifdef CONFIG_MACH_U300_BS335
&isp_clk,
&cds_clk,
#endif
&dma_clk,
&aaif_clk,
&apex_clk,
&video_enc_clk,
&xgam_clk,
&ahb_clk,
/* AHB bridge clocks */
&ahb_subsys_clk,
&intcon_clk,
&mspro_clk,
&emif_clk,
/* FAST bridge clocks */
&fast_clk,
&mmcsd_clk,
&i2s0_clk,
&i2s1_clk,
&i2c0_clk,
&i2c1_clk,
&spi_clk,
#ifdef CONFIG_MACH_U300_BS335
&uart1_clk,
&uart1_pclk,
#endif
/* SLOW bridge clocks */
&slow_clk,
&wdog_clk,
&uart0_clk,
&uart0_pclk,
&app_timer_clk,
&keypad_clk,
&gpio_clk,
&rtc_clk,
&bustr_clk,
&evhist_clk,
&timer_clk,
#ifdef CONFIG_MACH_U300_BS335
&ppm_clk,
#endif
};
static int u300_clocks_show(struct seq_file *s, void *data)
{
struct clk *clk;
int i;
seq_printf(s, "CLOCK DEVICE RESET STATE\t" \
"ACTIVE\tUSERS\tHW CTRL FREQ\n");
seq_printf(s, "---------------------------------------------" \
"-----------------------------------------\n");
for (i = 0; i < ARRAY_SIZE(clks); i++) {
clk = clks[i];
if (clk != ERR_PTR(-ENOENT)) {
/* Format clock and device name nicely */
char cdp[33];
int chars;
chars = snprintf(&cdp[0], 17, "%s", clk->name);
while (chars < 16) {
cdp[chars] = ' ';
chars++;
}
chars = snprintf(&cdp[16], 17, "%s", clk->dev ?
dev_name(clk->dev) : "N/A");
while (chars < 16) {
cdp[chars+16] = ' ';
chars++;
}
cdp[32] = '\0';
if (clk->get_rate || clk->rate != 0)
seq_printf(s,
"%s%s\t%s\t%d\t%s\t%lu Hz\n",
&cdp[0],
clk->reset ?
"ASSERTED" : "RELEASED",
clk->usecount ? "ON" : "OFF",
clk->usecount,
clk->hw_ctrld ? "YES" : "NO ",
clk_get_rate(clk));
else
seq_printf(s,
"%s%s\t%s\t%d\t%s\t" \
"(unknown rate)\n",
&cdp[0],
clk->reset ?
"ASSERTED" : "RELEASED",
clk->usecount ? "ON" : "OFF",
clk->usecount,
clk->hw_ctrld ? "YES" : "NO ");
}
}
return 0;
}
static int u300_clocks_open(struct inode *inode, struct file *file)
{
return single_open(file, u300_clocks_show, NULL);
}
static const struct file_operations u300_clocks_operations = {
.open = u300_clocks_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init init_clk_read_debugfs(void)
{
/* Expose a simple debugfs interface to view all clocks */
(void) debugfs_create_file("u300_clocks", S_IFREG | S_IRUGO,
NULL, NULL,
&u300_clocks_operations);
return 0;
}
/*
* This needs to come in after the core_initcall() for the
* overall clocks, because debugfs is not available until
* the subsystems come up.
*/
module_init(init_clk_read_debugfs);
#endif
int __init u300_clock_init(void)
{
u16 val;
/*
* FIXME: shall all this powermanagement stuff really live here???
*/
/* Set system to run at PLL208, max performance, a known state. */
val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
val &= ~U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
/* Wait for the PLL208 to lock if not locked in yet */
while (!(readw(U300_SYSCON_VBASE + U300_SYSCON_CSR) &
U300_SYSCON_CSR_PLL208_LOCK_IND));
/* Power management enable */
val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMCR);
val |= U300_SYSCON_PMCR_PWR_MGNT_ENABLE;
writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMCR);
clk_register();
/*
* Some of these may be on when we boot the system so make sure they
* are turned OFF.
*/
syscon_block_reset_enable(&timer_clk);
timer_clk.disable(&timer_clk);
/*
* These shall be turned on by default when we boot the system
* so make sure they are ON. (Adding CPU here is a bit too much.)
* These clocks will be claimed by drivers later.
*/
syscon_block_reset_disable(&semi_clk);
syscon_block_reset_disable(&emif_clk);
clk_enable(&semi_clk);
clk_enable(&emif_clk);
return 0;
}
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