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Diffstat (limited to 'arch/arm/mach-lpc32xx/clock.c')
-rw-r--r--arch/arm/mach-lpc32xx/clock.c183
1 files changed, 119 insertions, 64 deletions
diff --git a/arch/arm/mach-lpc32xx/clock.c b/arch/arm/mach-lpc32xx/clock.c
index 1e027514096d..b7ef51119d37 100644
--- a/arch/arm/mach-lpc32xx/clock.c
+++ b/arch/arm/mach-lpc32xx/clock.c
@@ -82,10 +82,12 @@
* will also impact the individual peripheral rates.
*/
+#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/device.h>
+#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/amba/bus.h>
@@ -97,9 +99,12 @@
#include "clock.h"
#include "common.h"
+static DEFINE_SPINLOCK(global_clkregs_lock);
+
+static int usb_pll_enable, usb_pll_valid;
+
static struct clk clk_armpll;
static struct clk clk_usbpll;
-static DEFINE_MUTEX(clkm_lock);
/*
* Post divider values for PLLs based on selected register value
@@ -127,7 +132,7 @@ static struct clk osc_32KHz = {
static int local_pll397_enable(struct clk *clk, int enable)
{
u32 reg;
- unsigned long timeout = 1 + msecs_to_jiffies(10);
+ unsigned long timeout = jiffies + msecs_to_jiffies(10);
reg = __raw_readl(LPC32XX_CLKPWR_PLL397_CTRL);
@@ -142,7 +147,7 @@ static int local_pll397_enable(struct clk *clk, int enable)
/* Wait for PLL397 lock */
while (((__raw_readl(LPC32XX_CLKPWR_PLL397_CTRL) &
LPC32XX_CLKPWR_SYSCTRL_PLL397_STS) == 0) &&
- (timeout > jiffies))
+ time_before(jiffies, timeout))
cpu_relax();
if ((__raw_readl(LPC32XX_CLKPWR_PLL397_CTRL) &
@@ -156,7 +161,7 @@ static int local_pll397_enable(struct clk *clk, int enable)
static int local_oscmain_enable(struct clk *clk, int enable)
{
u32 reg;
- unsigned long timeout = 1 + msecs_to_jiffies(10);
+ unsigned long timeout = jiffies + msecs_to_jiffies(10);
reg = __raw_readl(LPC32XX_CLKPWR_MAIN_OSC_CTRL);
@@ -171,7 +176,7 @@ static int local_oscmain_enable(struct clk *clk, int enable)
/* Wait for main oscillator to start */
while (((__raw_readl(LPC32XX_CLKPWR_MAIN_OSC_CTRL) &
LPC32XX_CLKPWR_MOSC_DISABLE) != 0) &&
- (timeout > jiffies))
+ time_before(jiffies, timeout))
cpu_relax();
if ((__raw_readl(LPC32XX_CLKPWR_MAIN_OSC_CTRL) &
@@ -382,30 +387,62 @@ static u32 local_clk_usbpll_setup(struct clk_pll_setup *pHCLKPllSetup)
static int local_usbpll_enable(struct clk *clk, int enable)
{
u32 reg;
- int ret = -ENODEV;
- unsigned long timeout = 1 + msecs_to_jiffies(10);
+ int ret = 0;
+ unsigned long timeout = jiffies + msecs_to_jiffies(20);
reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
- if (enable == 0) {
- reg &= ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN1 |
- LPC32XX_CLKPWR_USBCTRL_CLK_EN2);
- __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
- } else if (reg & LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP) {
+ __raw_writel(reg & ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN2 |
+ LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP),
+ LPC32XX_CLKPWR_USB_CTRL);
+ __raw_writel(reg & ~LPC32XX_CLKPWR_USBCTRL_CLK_EN1,
+ LPC32XX_CLKPWR_USB_CTRL);
+
+ if (enable && usb_pll_valid && usb_pll_enable) {
+ ret = -ENODEV;
+ /*
+ * If the PLL rate has been previously set, then the rate
+ * in the PLL register is valid and can be enabled here.
+ * Otherwise, it needs to be enabled as part of setrate.
+ */
+
+ /*
+ * Gate clock into PLL
+ */
reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN1;
__raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
- /* Wait for PLL lock */
- while ((timeout > jiffies) & (ret == -ENODEV)) {
+ /*
+ * Enable PLL
+ */
+ reg |= LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP;
+ __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
+
+ /*
+ * Wait for PLL to lock
+ */
+ while (time_before(jiffies, timeout) && (ret == -ENODEV)) {
reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
if (reg & LPC32XX_CLKPWR_USBCTRL_PLL_STS)
ret = 0;
+ else
+ udelay(10);
}
+ /*
+ * Gate clock from PLL if PLL is locked
+ */
if (ret == 0) {
- reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN2;
- __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
+ __raw_writel(reg | LPC32XX_CLKPWR_USBCTRL_CLK_EN2,
+ LPC32XX_CLKPWR_USB_CTRL);
+ } else {
+ __raw_writel(reg & ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN1 |
+ LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP),
+ LPC32XX_CLKPWR_USB_CTRL);
}
+ } else if ((enable == 0) && usb_pll_valid && usb_pll_enable) {
+ usb_pll_valid = 0;
+ usb_pll_enable = 0;
}
return ret;
@@ -423,7 +460,7 @@ static unsigned long local_usbpll_round_rate(struct clk *clk,
*/
rate = rate * 1000;
- clkin = clk->parent->rate;
+ clkin = clk->get_rate(clk);
usbdiv = (__raw_readl(LPC32XX_CLKPWR_USBCLK_PDIV) &
LPC32XX_CLKPWR_USBPDIV_PLL_MASK) + 1;
clkin = clkin / usbdiv;
@@ -437,7 +474,8 @@ static unsigned long local_usbpll_round_rate(struct clk *clk,
static int local_usbpll_set_rate(struct clk *clk, unsigned long rate)
{
- u32 clkin, reg, usbdiv;
+ int ret = -ENODEV;
+ u32 clkin, usbdiv;
struct clk_pll_setup pllsetup;
/*
@@ -446,7 +484,7 @@ static int local_usbpll_set_rate(struct clk *clk, unsigned long rate)
*/
rate = rate * 1000;
- clkin = clk->get_rate(clk);
+ clkin = clk->get_rate(clk->parent);
usbdiv = (__raw_readl(LPC32XX_CLKPWR_USBCLK_PDIV) &
LPC32XX_CLKPWR_USBPDIV_PLL_MASK) + 1;
clkin = clkin / usbdiv;
@@ -455,22 +493,25 @@ static int local_usbpll_set_rate(struct clk *clk, unsigned long rate)
if (local_clk_find_pll_cfg(clkin, rate, &pllsetup) == 0)
return -EINVAL;
+ /*
+ * Disable PLL clocks during PLL change
+ */
local_usbpll_enable(clk, 0);
-
- reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
- reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN1;
- __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
-
- pllsetup.analog_on = 1;
+ pllsetup.analog_on = 0;
local_clk_usbpll_setup(&pllsetup);
- clk->rate = clk_check_pll_setup(clkin, &pllsetup);
+ /*
+ * Start USB PLL and check PLL status
+ */
+
+ usb_pll_valid = 1;
+ usb_pll_enable = 1;
- reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
- reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN2;
- __raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);
+ ret = local_usbpll_enable(clk, 1);
+ if (ret >= 0)
+ clk->rate = clk_check_pll_setup(clkin, &pllsetup);
- return 0;
+ return ret;
}
static struct clk clk_usbpll = {
@@ -719,6 +760,41 @@ static struct clk clk_tsc = {
.get_rate = local_return_parent_rate,
};
+static int adc_onoff_enable(struct clk *clk, int enable)
+{
+ u32 tmp;
+ u32 divider;
+
+ /* Use PERIPH_CLOCK */
+ tmp = __raw_readl(LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
+ tmp |= LPC32XX_CLKPWR_ADCCTRL1_PCLK_SEL;
+ /*
+ * Set clock divider so that we have equal to or less than
+ * 4.5MHz clock at ADC
+ */
+ divider = clk->get_rate(clk) / 4500000 + 1;
+ tmp |= divider;
+ __raw_writel(tmp, LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
+
+ /* synchronize rate of this clock w/ actual HW setting */
+ clk->rate = clk->get_rate(clk->parent) / divider;
+
+ if (enable == 0)
+ __raw_writel(0, clk->enable_reg);
+ else
+ __raw_writel(clk->enable_mask, clk->enable_reg);
+
+ return 0;
+}
+
+static struct clk clk_adc = {
+ .parent = &clk_pclk,
+ .enable = adc_onoff_enable,
+ .enable_reg = LPC32XX_CLKPWR_ADC_CLK_CTRL,
+ .enable_mask = LPC32XX_CLKPWR_ADC32CLKCTRL_CLK_EN,
+ .get_rate = local_return_parent_rate,
+};
+
static int mmc_onoff_enable(struct clk *clk, int enable)
{
u32 tmp;
@@ -891,20 +967,8 @@ static struct clk clk_lcd = {
.enable_mask = LPC32XX_CLKPWR_LCDCTRL_CLK_EN,
};
-static inline void clk_lock(void)
-{
- mutex_lock(&clkm_lock);
-}
-
-static inline void clk_unlock(void)
-{
- mutex_unlock(&clkm_lock);
-}
-
static void local_clk_disable(struct clk *clk)
{
- WARN_ON(clk->usecount == 0);
-
/* Don't attempt to disable clock if it has no users */
if (clk->usecount > 0) {
clk->usecount--;
@@ -947,10 +1011,11 @@ static int local_clk_enable(struct clk *clk)
int clk_enable(struct clk *clk)
{
int ret;
+ unsigned long flags;
- clk_lock();
+ spin_lock_irqsave(&global_clkregs_lock, flags);
ret = local_clk_enable(clk);
- clk_unlock();
+ spin_unlock_irqrestore(&global_clkregs_lock, flags);
return ret;
}
@@ -961,9 +1026,11 @@ EXPORT_SYMBOL(clk_enable);
*/
void clk_disable(struct clk *clk)
{
- clk_lock();
+ unsigned long flags;
+
+ spin_lock_irqsave(&global_clkregs_lock, flags);
local_clk_disable(clk);
- clk_unlock();
+ spin_unlock_irqrestore(&global_clkregs_lock, flags);
}
EXPORT_SYMBOL(clk_disable);
@@ -972,13 +1039,7 @@ EXPORT_SYMBOL(clk_disable);
*/
unsigned long clk_get_rate(struct clk *clk)
{
- unsigned long rate;
-
- clk_lock();
- rate = clk->get_rate(clk);
- clk_unlock();
-
- return rate;
+ return clk->get_rate(clk);
}
EXPORT_SYMBOL(clk_get_rate);
@@ -994,11 +1055,8 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
* the actual rate set as part of the peripheral dividers
* instead of high level clock control
*/
- if (clk->set_rate) {
- clk_lock();
+ if (clk->set_rate)
ret = clk->set_rate(clk, rate);
- clk_unlock();
- }
return ret;
}
@@ -1009,15 +1067,11 @@ EXPORT_SYMBOL(clk_set_rate);
*/
long clk_round_rate(struct clk *clk, unsigned long rate)
{
- clk_lock();
-
if (clk->round_rate)
rate = clk->round_rate(clk, rate);
else
rate = clk->get_rate(clk);
- clk_unlock();
-
return rate;
}
EXPORT_SYMBOL(clk_round_rate);
@@ -1075,10 +1129,11 @@ static struct clk_lookup lookups[] = {
_REGISTER_CLOCK("dev:ssp1", NULL, clk_ssp1)
_REGISTER_CLOCK("lpc32xx_keys.0", NULL, clk_kscan)
_REGISTER_CLOCK("lpc32xx-nand.0", "nand_ck", clk_nand)
- _REGISTER_CLOCK("tbd", "i2s0_ck", clk_i2s0)
- _REGISTER_CLOCK("tbd", "i2s1_ck", clk_i2s1)
+ _REGISTER_CLOCK("lpc32xx-adc", NULL, clk_adc)
+ _REGISTER_CLOCK(NULL, "i2s0_ck", clk_i2s0)
+ _REGISTER_CLOCK(NULL, "i2s1_ck", clk_i2s1)
_REGISTER_CLOCK("ts-lpc32xx", NULL, clk_tsc)
- _REGISTER_CLOCK("dev:mmc0", "MCLK", clk_mmc)
+ _REGISTER_CLOCK("dev:mmc0", NULL, clk_mmc)
_REGISTER_CLOCK("lpc-net.0", NULL, clk_net)
_REGISTER_CLOCK("dev:clcd", NULL, clk_lcd)
_REGISTER_CLOCK("lpc32xx_udc", "ck_usbd", clk_usbd)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.