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OpenCloudOS-Kernel/arch/arm/mach-pnx4008/clock.c

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/*
* arch/arm/mach-pnx4008/clock.c
*
* Clock control driver for PNX4008
*
* Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
* Generic clock management functions are partially based on:
* linux/arch/arm/mach-omap/clock.c
*
* 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <asm/clkdev.h>
#include <mach/hardware.h>
#include <mach/clock.h>
#include "clock.h"
/*forward declaration*/
static struct clk per_ck;
static struct clk hclk_ck;
static struct clk ck_1MHz;
static struct clk ck_13MHz;
static struct clk ck_pll1;
static int local_set_rate(struct clk *clk, u32 rate);
static inline void clock_lock(void)
{
local_irq_disable();
}
static inline void clock_unlock(void)
{
local_irq_enable();
}
static void propagate_rate(struct clk *clk)
{
struct clk *tmp_clk;
tmp_clk = clk;
while (tmp_clk->propagate_next) {
tmp_clk = tmp_clk->propagate_next;
local_set_rate(tmp_clk, tmp_clk->user_rate);
}
}
static void clk_reg_disable(struct clk *clk)
{
if (clk->enable_reg)
__raw_writel(__raw_readl(clk->enable_reg) &
~(1 << clk->enable_shift), clk->enable_reg);
}
static int clk_reg_enable(struct clk *clk)
{
if (clk->enable_reg)
__raw_writel(__raw_readl(clk->enable_reg) |
(1 << clk->enable_shift), clk->enable_reg);
return 0;
}
static inline void clk_reg_disable1(struct clk *clk)
{
if (clk->enable_reg1)
__raw_writel(__raw_readl(clk->enable_reg1) &
~(1 << clk->enable_shift1), clk->enable_reg1);
}
static inline void clk_reg_enable1(struct clk *clk)
{
if (clk->enable_reg1)
__raw_writel(__raw_readl(clk->enable_reg1) |
(1 << clk->enable_shift1), clk->enable_reg1);
}
static int clk_wait_for_pll_lock(struct clk *clk)
{
int i;
i = 0;
while (i++ < 0xFFF && !(__raw_readl(clk->scale_reg) & 1)) ; /*wait for PLL to lock */
if (!(__raw_readl(clk->scale_reg) & 1)) {
printk(KERN_ERR
"%s ERROR: failed to lock, scale reg data: %x\n",
clk->name, __raw_readl(clk->scale_reg));
return -1;
}
return 0;
}
static int switch_to_dirty_13mhz(struct clk *clk)
{
int i;
int ret;
u32 tmp_reg;
ret = 0;
if (!clk->rate)
clk_reg_enable1(clk);
tmp_reg = __raw_readl(clk->parent_switch_reg);
/*if 13Mhz clock selected, select 13'MHz (dirty) source from OSC */
if (!(tmp_reg & 1)) {
tmp_reg |= (1 << 1); /* Trigger switch to 13'MHz (dirty) clock */
__raw_writel(tmp_reg, clk->parent_switch_reg);
i = 0;
while (i++ < 0xFFF && !(__raw_readl(clk->parent_switch_reg) & 1)) ; /*wait for 13'MHz selection status */
if (!(__raw_readl(clk->parent_switch_reg) & 1)) {
printk(KERN_ERR
"%s ERROR: failed to select 13'MHz, parent sw reg data: %x\n",
clk->name, __raw_readl(clk->parent_switch_reg));
ret = -1;
}
}
if (!clk->rate)
clk_reg_disable1(clk);
return ret;
}
static int switch_to_clean_13mhz(struct clk *clk)
{
int i;
int ret;
u32 tmp_reg;
ret = 0;
if (!clk->rate)
clk_reg_enable1(clk);
tmp_reg = __raw_readl(clk->parent_switch_reg);
/*if 13'Mhz clock selected, select 13MHz (clean) source from OSC */
if (tmp_reg & 1) {
tmp_reg &= ~(1 << 1); /* Trigger switch to 13MHz (clean) clock */
__raw_writel(tmp_reg, clk->parent_switch_reg);
i = 0;
while (i++ < 0xFFF && (__raw_readl(clk->parent_switch_reg) & 1)) ; /*wait for 13MHz selection status */
if (__raw_readl(clk->parent_switch_reg) & 1) {
printk(KERN_ERR
"%s ERROR: failed to select 13MHz, parent sw reg data: %x\n",
clk->name, __raw_readl(clk->parent_switch_reg));
ret = -1;
}
}
if (!clk->rate)
clk_reg_disable1(clk);
return ret;
}
static int set_13MHz_parent(struct clk *clk, struct clk *parent)
{
int ret = -EINVAL;
if (parent == &ck_13MHz)
ret = switch_to_clean_13mhz(clk);
else if (parent == &ck_pll1)
ret = switch_to_dirty_13mhz(clk);
return ret;
}
#define PLL160_MIN_FCCO 156000
#define PLL160_MAX_FCCO 320000
/*
* Calculate pll160 settings.
* Possible input: up to 320MHz with step of clk->parent->rate.
* In PNX4008 parent rate for pll160s may be either 1 or 13MHz.
* Ignored paths: "feedback" (bit 13 set), "div-by-N".
* Setting ARM PLL4 rate to 0 will put CPU into direct run mode.
* Setting PLL5 and PLL3 rate to 0 will disable USB and DSP clock input.
* Please refer to PNX4008 IC manual for details.
*/
static int pll160_set_rate(struct clk *clk, u32 rate)
{
u32 tmp_reg, tmp_m, tmp_2p, i;
u32 parent_rate;
int ret = -EINVAL;
parent_rate = clk->parent->rate;
if (!parent_rate)
goto out;
/* set direct run for ARM or disable output for others */
clk_reg_disable(clk);
/* disable source input as well (ignored for ARM) */
clk_reg_disable1(clk);
tmp_reg = __raw_readl(clk->scale_reg);
tmp_reg &= ~0x1ffff; /*clear all settings, power down */
__raw_writel(tmp_reg, clk->scale_reg);
rate -= rate % parent_rate; /*round down the input */
if (rate > PLL160_MAX_FCCO)
rate = PLL160_MAX_FCCO;
if (!rate) {
clk->rate = 0;
ret = 0;
goto out;
}
clk_reg_enable1(clk);
tmp_reg = __raw_readl(clk->scale_reg);
if (rate == parent_rate) {
/*enter direct bypass mode */
tmp_reg |= ((1 << 14) | (1 << 15));
__raw_writel(tmp_reg, clk->scale_reg);
clk->rate = parent_rate;
clk_reg_enable(clk);
ret = 0;
goto out;
}
i = 0;
for (tmp_2p = 1; tmp_2p < 16; tmp_2p <<= 1) {
if (rate * tmp_2p >= PLL160_MIN_FCCO)
break;
i++;
}
if (tmp_2p > 1)
tmp_reg |= ((i - 1) << 11);
else
tmp_reg |= (1 << 14); /*direct mode, no divide */
tmp_m = rate * tmp_2p;
tmp_m /= parent_rate;
tmp_reg |= (tmp_m - 1) << 1; /*calculate M */
tmp_reg |= (1 << 16); /*power up PLL */
__raw_writel(tmp_reg, clk->scale_reg);
if (clk_wait_for_pll_lock(clk) < 0) {
clk_reg_disable(clk);
clk_reg_disable1(clk);
tmp_reg = __raw_readl(clk->scale_reg);
tmp_reg &= ~0x1ffff; /*clear all settings, power down */
__raw_writel(tmp_reg, clk->scale_reg);
clk->rate = 0;
ret = -EFAULT;
goto out;
}
clk->rate = (tmp_m * parent_rate) / tmp_2p;
if (clk->flags & RATE_PROPAGATES)
propagate_rate(clk);
clk_reg_enable(clk);
ret = 0;
out:
return ret;
}
/*configure PER_CLK*/
static int per_clk_set_rate(struct clk *clk, u32 rate)
{
u32 tmp;
tmp = __raw_readl(clk->scale_reg);
tmp &= ~(0x1f << 2);
tmp |= ((clk->parent->rate / clk->rate) - 1) << 2;
__raw_writel(tmp, clk->scale_reg);
clk->rate = rate;
return 0;
}
/*configure HCLK*/
static int hclk_set_rate(struct clk *clk, u32 rate)
{
u32 tmp;
tmp = __raw_readl(clk->scale_reg);
tmp = tmp & ~0x3;
switch (rate) {
case 1:
break;
case 2:
tmp |= 1;
break;
case 4:
tmp |= 2;
break;
}
__raw_writel(tmp, clk->scale_reg);
clk->rate = rate;
return 0;
}
static u32 hclk_round_rate(struct clk *clk, u32 rate)
{
switch (rate) {
case 1:
case 4:
return rate;
}
return 2;
}
static u32 per_clk_round_rate(struct clk *clk, u32 rate)
{
return CLK_RATE_13MHZ;
}
static int on_off_set_rate(struct clk *clk, u32 rate)
{
if (rate) {
clk_reg_enable(clk);
clk->rate = 1;
} else {
clk_reg_disable(clk);
clk->rate = 0;
}
return 0;
}
static int on_off_inv_set_rate(struct clk *clk, u32 rate)
{
if (rate) {
clk_reg_disable(clk); /*enable bit is inverted */
clk->rate = 1;
} else {
clk_reg_enable(clk);
clk->rate = 0;
}
return 0;
}
static u32 on_off_round_rate(struct clk *clk, u32 rate)
{
return (rate ? 1 : 0);
}
static u32 pll4_round_rate(struct clk *clk, u32 rate)
{
if (rate > CLK_RATE_208MHZ)
rate = CLK_RATE_208MHZ;
if (rate == CLK_RATE_208MHZ && hclk_ck.user_rate == 1)
rate = CLK_RATE_208MHZ - CLK_RATE_13MHZ;
return (rate - (rate % (hclk_ck.user_rate * CLK_RATE_13MHZ)));
}
static u32 pll3_round_rate(struct clk *clk, u32 rate)
{
if (rate > CLK_RATE_208MHZ)
rate = CLK_RATE_208MHZ;
return (rate - rate % CLK_RATE_13MHZ);
}
static u32 pll5_round_rate(struct clk *clk, u32 rate)
{
return (rate ? CLK_RATE_48MHZ : 0);
}
static u32 ck_13MHz_round_rate(struct clk *clk, u32 rate)
{
return (rate ? CLK_RATE_13MHZ : 0);
}
static int ck_13MHz_set_rate(struct clk *clk, u32 rate)
{
if (rate) {
clk_reg_disable(clk); /*enable bit is inverted */
udelay(500);
clk->rate = CLK_RATE_13MHZ;
ck_1MHz.rate = CLK_RATE_1MHZ;
} else {
clk_reg_enable(clk);
clk->rate = 0;
ck_1MHz.rate = 0;
}
return 0;
}
static int pll1_set_rate(struct clk *clk, u32 rate)
{
#if 0 /* doesn't work on some boards, probably a HW BUG */
if (rate) {
clk_reg_disable(clk); /*enable bit is inverted */
if (!clk_wait_for_pll_lock(clk)) {
clk->rate = CLK_RATE_13MHZ;
} else {
clk_reg_enable(clk);
clk->rate = 0;
}
} else {
clk_reg_enable(clk);
clk->rate = 0;
}
#endif
return 0;
}
/* Clock sources */
static struct clk osc_13MHz = {
.name = "osc_13MHz",
.flags = FIXED_RATE,
.rate = CLK_RATE_13MHZ,
};
static struct clk ck_13MHz = {
.name = "ck_13MHz",
.parent = &osc_13MHz,
.flags = NEEDS_INITIALIZATION,
.round_rate = &ck_13MHz_round_rate,
.set_rate = &ck_13MHz_set_rate,
.enable_reg = OSC13CTRL_REG,
.enable_shift = 0,
.rate = CLK_RATE_13MHZ,
};
static struct clk osc_32KHz = {
.name = "osc_32KHz",
.flags = FIXED_RATE,
.rate = CLK_RATE_32KHZ,
};
/*attached to PLL5*/
static struct clk ck_1MHz = {
.name = "ck_1MHz",
.flags = FIXED_RATE | PARENT_SET_RATE,
.parent = &ck_13MHz,
};
/* PLL1 (397) - provides 13' MHz clock */
static struct clk ck_pll1 = {
.name = "ck_pll1",
.parent = &osc_32KHz,
.flags = NEEDS_INITIALIZATION,
.round_rate = &ck_13MHz_round_rate,
.set_rate = &pll1_set_rate,
.enable_reg = PLLCTRL_REG,
.enable_shift = 1,
.scale_reg = PLLCTRL_REG,
.rate = CLK_RATE_13MHZ,
};
/* CPU/Bus PLL */
static struct clk ck_pll4 = {
.name = "ck_pll4",
.parent = &ck_pll1,
.flags = RATE_PROPAGATES | NEEDS_INITIALIZATION,
.propagate_next = &per_ck,
.round_rate = &pll4_round_rate,
.set_rate = &pll160_set_rate,
.rate = CLK_RATE_208MHZ,
.scale_reg = HCLKPLLCTRL_REG,
.enable_reg = PWRCTRL_REG,
.enable_shift = 2,
.parent_switch_reg = SYSCLKCTRL_REG,
.set_parent = &set_13MHz_parent,
};
/* USB PLL */
static struct clk ck_pll5 = {
.name = "ck_pll5",
.parent = &ck_1MHz,
.flags = NEEDS_INITIALIZATION,
.round_rate = &pll5_round_rate,
.set_rate = &pll160_set_rate,
.scale_reg = USBCTRL_REG,
.enable_reg = USBCTRL_REG,
.enable_shift = 18,
.enable_reg1 = USBCTRL_REG,
.enable_shift1 = 17,
};
/* XPERTTeak DSP PLL */
static struct clk ck_pll3 = {
.name = "ck_pll3",
.parent = &ck_pll1,
.flags = NEEDS_INITIALIZATION,
.round_rate = &pll3_round_rate,
.set_rate = &pll160_set_rate,
.scale_reg = DSPPLLCTRL_REG,
.enable_reg = DSPCLKCTRL_REG,
.enable_shift = 3,
.enable_reg1 = DSPCLKCTRL_REG,
.enable_shift1 = 2,
.parent_switch_reg = DSPCLKCTRL_REG,
.set_parent = &set_13MHz_parent,
};
static struct clk hclk_ck = {
.name = "hclk_ck",
.parent = &ck_pll4,
.flags = PARENT_SET_RATE,
.set_rate = &hclk_set_rate,
.round_rate = &hclk_round_rate,
.scale_reg = HCLKDIVCTRL_REG,
.rate = 2,
.user_rate = 2,
};
static struct clk per_ck = {
.name = "per_ck",
.parent = &ck_pll4,
.flags = FIXED_RATE,
.propagate_next = &hclk_ck,
.set_rate = &per_clk_set_rate,
.round_rate = &per_clk_round_rate,
.scale_reg = HCLKDIVCTRL_REG,
.rate = CLK_RATE_13MHZ,
.user_rate = CLK_RATE_13MHZ,
};
static struct clk m2hclk_ck = {
.name = "m2hclk_ck",
.parent = &hclk_ck,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_inv_set_rate,
.rate = 1,
.enable_shift = 6,
.enable_reg = PWRCTRL_REG,
};
static struct clk vfp9_ck = {
.name = "vfp9_ck",
.parent = &ck_pll4,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.rate = 1,
.enable_shift = 4,
.enable_reg = VFP9CLKCTRL_REG,
};
static struct clk keyscan_ck = {
.name = "keyscan_ck",
.parent = &osc_32KHz,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 0,
.enable_reg = KEYCLKCTRL_REG,
};
static struct clk touch_ck = {
.name = "touch_ck",
.parent = &osc_32KHz,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 0,
.enable_reg = TSCLKCTRL_REG,
};
static struct clk pwm1_ck = {
.name = "pwm1_ck",
.parent = &osc_32KHz,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 0,
.enable_reg = PWMCLKCTRL_REG,
};
static struct clk pwm2_ck = {
.name = "pwm2_ck",
.parent = &osc_32KHz,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 2,
.enable_reg = PWMCLKCTRL_REG,
};
static struct clk jpeg_ck = {
.name = "jpeg_ck",
.parent = &hclk_ck,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 0,
.enable_reg = JPEGCLKCTRL_REG,
};
static struct clk ms_ck = {
.name = "ms_ck",
.parent = &ck_pll4,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 5,
.enable_reg = MSCTRL_REG,
};
static struct clk dum_ck = {
.name = "dum_ck",
.parent = &hclk_ck,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 0,
.enable_reg = DUMCLKCTRL_REG,
};
static struct clk flash_ck = {
.name = "flash_ck",
.parent = &hclk_ck,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 1, /* Only MLC clock supported */
.enable_reg = FLASHCLKCTRL_REG,
};
static struct clk i2c0_ck = {
.name = "i2c0_ck",
.parent = &per_ck,
.flags = NEEDS_INITIALIZATION | FIXED_RATE,
.enable_shift = 0,
.enable_reg = I2CCLKCTRL_REG,
.rate = 13000000,
.enable = clk_reg_enable,
.disable = clk_reg_disable,
};
static struct clk i2c1_ck = {
.name = "i2c1_ck",
.parent = &per_ck,
.flags = NEEDS_INITIALIZATION | FIXED_RATE,
.enable_shift = 1,
.enable_reg = I2CCLKCTRL_REG,
.rate = 13000000,
.enable = clk_reg_enable,
.disable = clk_reg_disable,
};
static struct clk i2c2_ck = {
.name = "i2c2_ck",
.parent = &per_ck,
.flags = NEEDS_INITIALIZATION | FIXED_RATE,
.enable_shift = 2,
.enable_reg = USB_OTG_CLKCTRL_REG,
.rate = 13000000,
.enable = clk_reg_enable,
.disable = clk_reg_disable,
};
static struct clk spi0_ck = {
.name = "spi0_ck",
.parent = &hclk_ck,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 0,
.enable_reg = SPICTRL_REG,
};
static struct clk spi1_ck = {
.name = "spi1_ck",
.parent = &hclk_ck,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 4,
.enable_reg = SPICTRL_REG,
};
static struct clk dma_ck = {
.name = "dma_ck",
.parent = &hclk_ck,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 0,
.enable_reg = DMACLKCTRL_REG,
};
static struct clk uart3_ck = {
.name = "uart3_ck",
.parent = &per_ck,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.rate = 1,
.enable_shift = 0,
.enable_reg = UARTCLKCTRL_REG,
};
static struct clk uart4_ck = {
.name = "uart4_ck",
.parent = &per_ck,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 1,
.enable_reg = UARTCLKCTRL_REG,
};
static struct clk uart5_ck = {
.name = "uart5_ck",
.parent = &per_ck,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.rate = 1,
.enable_shift = 2,
.enable_reg = UARTCLKCTRL_REG,
};
static struct clk uart6_ck = {
.name = "uart6_ck",
.parent = &per_ck,
.flags = NEEDS_INITIALIZATION,
.round_rate = &on_off_round_rate,
.set_rate = &on_off_set_rate,
.enable_shift = 3,
.enable_reg = UARTCLKCTRL_REG,
};
static struct clk wdt_ck = {
.name = "wdt_ck",
.parent = &per_ck,
.flags = NEEDS_INITIALIZATION,
.enable_shift = 0,
.enable_reg = TIMCLKCTRL_REG,
.enable = clk_reg_enable,
.disable = clk_reg_disable,
};
/* These clocks are visible outside this module
* and can be initialized
*/
static struct clk *onchip_clks[] __initdata = {
&ck_13MHz,
&ck_pll1,
&ck_pll4,
&ck_pll5,
&ck_pll3,
&vfp9_ck,
&m2hclk_ck,
&hclk_ck,
&dma_ck,
&flash_ck,
&dum_ck,
&keyscan_ck,
&pwm1_ck,
&pwm2_ck,
&jpeg_ck,
&ms_ck,
&touch_ck,
&i2c0_ck,
&i2c1_ck,
&i2c2_ck,
&spi0_ck,
&spi1_ck,
&uart3_ck,
&uart4_ck,
&uart5_ck,
&uart6_ck,
&wdt_ck,
};
static struct clk_lookup onchip_clkreg[] = {
{ .clk = &ck_13MHz, .con_id = "ck_13MHz" },
{ .clk = &ck_pll1, .con_id = "ck_pll1" },
{ .clk = &ck_pll4, .con_id = "ck_pll4" },
{ .clk = &ck_pll5, .con_id = "ck_pll5" },
{ .clk = &ck_pll3, .con_id = "ck_pll3" },
{ .clk = &vfp9_ck, .con_id = "vfp9_ck" },
{ .clk = &m2hclk_ck, .con_id = "m2hclk_ck" },
{ .clk = &hclk_ck, .con_id = "hclk_ck" },
{ .clk = &dma_ck, .con_id = "dma_ck" },
{ .clk = &flash_ck, .con_id = "flash_ck" },
{ .clk = &dum_ck, .con_id = "dum_ck" },
{ .clk = &keyscan_ck, .con_id = "keyscan_ck" },
{ .clk = &pwm1_ck, .con_id = "pwm1_ck" },
{ .clk = &pwm2_ck, .con_id = "pwm2_ck" },
{ .clk = &jpeg_ck, .con_id = "jpeg_ck" },
{ .clk = &ms_ck, .con_id = "ms_ck" },
{ .clk = &touch_ck, .con_id = "touch_ck" },
{ .clk = &i2c0_ck, .dev_id = "pnx-i2c.0" },
{ .clk = &i2c1_ck, .dev_id = "pnx-i2c.1" },
{ .clk = &i2c2_ck, .dev_id = "pnx-i2c.2" },
{ .clk = &spi0_ck, .con_id = "spi0_ck" },
{ .clk = &spi1_ck, .con_id = "spi1_ck" },
{ .clk = &uart3_ck, .con_id = "uart3_ck" },
{ .clk = &uart4_ck, .con_id = "uart4_ck" },
{ .clk = &uart5_ck, .con_id = "uart5_ck" },
{ .clk = &uart6_ck, .con_id = "uart6_ck" },
{ .clk = &wdt_ck, .dev_id = "pnx4008-watchdog" },
};
static void local_clk_disable(struct clk *clk)
{
if (WARN_ON(clk->usecount == 0))
return;
if (!(--clk->usecount)) {
if (clk->disable)
clk->disable(clk);
else if (!(clk->flags & FIXED_RATE) && clk->rate && clk->set_rate)
clk->set_rate(clk, 0);
if (clk->parent)
local_clk_disable(clk->parent);
}
}
static int local_clk_enable(struct clk *clk)
{
int ret = 0;
if (clk->usecount == 0) {
if (clk->parent) {
ret = local_clk_enable(clk->parent);
if (ret != 0)
goto out;
}
if (clk->enable)
ret = clk->enable(clk);
else if (!(clk->flags & FIXED_RATE) && !clk->rate && clk->set_rate
&& clk->user_rate)
ret = clk->set_rate(clk, clk->user_rate);
if (ret != 0 && clk->parent) {
local_clk_disable(clk->parent);
goto out;
}
clk->usecount++;
}
out:
return ret;
}
static int local_set_rate(struct clk *clk, u32 rate)
{
int ret = -EINVAL;
if (clk->set_rate) {
if (clk->user_rate == clk->rate && clk->parent->rate) {
/* if clock enabled or rate not set */
clk->user_rate = clk->round_rate(clk, rate);
ret = clk->set_rate(clk, clk->user_rate);
} else
clk->user_rate = clk->round_rate(clk, rate);
ret = 0;
}
return ret;
}
int clk_set_rate(struct clk *clk, unsigned long rate)
{
int ret = -EINVAL;
if (clk->flags & FIXED_RATE)
goto out;
clock_lock();
if ((clk->flags & PARENT_SET_RATE) && clk->parent) {
clk->user_rate = clk->round_rate(clk, rate);
/* parent clock needs to be refreshed
for the setting to take effect */
} else {
ret = local_set_rate(clk, rate);
}
ret = 0;
clock_unlock();
out:
return ret;
}
EXPORT_SYMBOL(clk_set_rate);
unsigned long clk_get_rate(struct clk *clk)
{
unsigned long ret;
clock_lock();
ret = clk->rate;
clock_unlock();
return ret;
}
EXPORT_SYMBOL(clk_get_rate);
int clk_enable(struct clk *clk)
{
int ret;
clock_lock();
ret = local_clk_enable(clk);
clock_unlock();
return ret;
}
EXPORT_SYMBOL(clk_enable);
void clk_disable(struct clk *clk)
{
clock_lock();
local_clk_disable(clk);
clock_unlock();
}
EXPORT_SYMBOL(clk_disable);
long clk_round_rate(struct clk *clk, unsigned long rate)
{
long ret;
clock_lock();
if (clk->round_rate)
ret = clk->round_rate(clk, rate);
else
ret = clk->rate;
clock_unlock();
return ret;
}
EXPORT_SYMBOL(clk_round_rate);
int clk_set_parent(struct clk *clk, struct clk *parent)
{
int ret = -ENODEV;
if (!clk->set_parent)
goto out;
clock_lock();
ret = clk->set_parent(clk, parent);
if (!ret)
clk->parent = parent;
clock_unlock();
out:
return ret;
}
EXPORT_SYMBOL(clk_set_parent);
static int __init clk_init(void)
{
struct clk **clkp;
/* Disable autoclocking, as it doesn't seem to work */
__raw_writel(0xff, AUTOCLK_CTRL);
for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
clkp++) {
struct clk *clk = *clkp;
if (clk->flags & NEEDS_INITIALIZATION) {
if (clk->set_rate) {
clk->user_rate = clk->rate;
local_set_rate(clk, clk->user_rate);
if (clk->set_parent)
clk->set_parent(clk, clk->parent);
}
if (clk->enable && clk->usecount)
clk->enable(clk);
if (clk->disable && !clk->usecount)
clk->disable(clk);
}
pr_debug("%s: clock %s, rate %ld\n",
__func__, clk->name, clk->rate);
}
local_clk_enable(&ck_pll4);
/* if ck_13MHz is not used, disable it. */
if (ck_13MHz.usecount == 0)
local_clk_disable(&ck_13MHz);
/* Disable autoclocking */
__raw_writeb(0xff, AUTOCLK_CTRL);
clkdev_add_table(onchip_clkreg, ARRAY_SIZE(onchip_clkreg));
return 0;
}
arch_initcall(clk_init);
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