[ARM] pxa: introduce clk support for PXA SoC clocks

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 176 insertions, 29 deletions

diff --git a/arch/arm/mach-pxa/clock.c b/arch/arm/mach-pxa/clock.c
index 34a31caa6f9d..83ef5ecaf432 100644
--- a/arch/arm/mach-pxa/clock.c
+++ b/arch/arm/mach-pxa/clock.c
@@ -9,19 +9,15 @@
 #include <linux/string.h>
 #include <linux/clk.h>
 #include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
 
 #include <asm/arch/pxa-regs.h>
 #include <asm/hardware.h>
 
-struct clk {
-        struct list_head        node;
-        unsigned long           rate;
-        struct module           *owner;
-        const char              *name;
-        unsigned int            enabled;
-        void                    (*enable)(void);
-        void                    (*disable)(void);
-};
+#include "devices.h"
+#include "generic.h"
+#include "clock.h"
 
 static LIST_HEAD(clocks);
 static DEFINE_MUTEX(clocks_mutex);
@@ -33,7 +29,8 @@ struct clk *clk_get(struct device *dev, const char *id)
 
         mutex_lock(&clocks_mutex);
         list_for_each_entry(p, &clocks, node) {
-                if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
+                if (strcmp(id, p->name) == 0 &&
+                    (p->dev == NULL || p->dev == dev)) {
                         clk = p;
                         break;
                 }
@@ -46,7 +43,6 @@ EXPORT_SYMBOL(clk_get);
 
 void clk_put(struct clk *clk)
 {
-        module_put(clk->owner);
 }
 EXPORT_SYMBOL(clk_put);
 
@@ -56,8 +52,12 @@ int clk_enable(struct clk *clk)
 
         spin_lock_irqsave(&clocks_lock, flags);
         if (clk->enabled++ == 0)
-                clk->enable();
+                clk->ops->enable(clk);
         spin_unlock_irqrestore(&clocks_lock, flags);
+
+        if (clk->delay)
+                udelay(clk->delay);
+
         return 0;
 }
 EXPORT_SYMBOL(clk_enable);
@@ -70,54 +70,75 @@ void clk_disable(struct clk *clk)
 
         spin_lock_irqsave(&clocks_lock, flags);
         if (--clk->enabled == 0)
-                clk->disable();
+                clk->ops->disable(clk);
         spin_unlock_irqrestore(&clocks_lock, flags);
 }
 EXPORT_SYMBOL(clk_disable);
 
 unsigned long clk_get_rate(struct clk *clk)
 {
-        return clk->rate;
+        unsigned long rate;
+
+        rate = clk->rate;
+        if (clk->ops->getrate)
+                rate = clk->ops->getrate(clk);
+
+        return rate;
 }
 EXPORT_SYMBOL(clk_get_rate);
 
 
-static void clk_gpio27_enable(void)
+static void clk_gpio27_enable(struct clk *clk)
 {
         pxa_gpio_mode(GPIO11_3_6MHz_MD);
 }
 
-static void clk_gpio27_disable(void)
+static void clk_gpio27_disable(struct clk *clk)
 {
 }
 
-static struct clk clk_gpio27 = {
-        .name           = "GPIO27_CLK",
-        .rate           = 3686400,
+static const struct clkops clk_gpio27_ops = {
         .enable         = clk_gpio27_enable,
         .disable        = clk_gpio27_disable,
 };
 
-int clk_register(struct clk *clk)
+
+void clk_cken_enable(struct clk *clk)
 {
-        mutex_lock(&clocks_mutex);
-        list_add(&clk->node, &clocks);
-        mutex_unlock(&clocks_mutex);
-        return 0;
+        CKEN |= 1 << clk->cken;
 }
-EXPORT_SYMBOL(clk_register);
 
-void clk_unregister(struct clk *clk)
+void clk_cken_disable(struct clk *clk)
 {
+        CKEN &= ~(1 << clk->cken);
+}
+
+const struct clkops clk_cken_ops = {
+        .enable         = clk_cken_enable,
+        .disable        = clk_cken_disable,
+};
+
+static struct clk common_clks[] = {
+        {
+                .name           = "GPIO27_CLK",
+                .ops            = &clk_gpio27_ops,
+                .rate           = 3686400,
+        },
+};
+
+void clks_register(struct clk *clks, size_t num)
+{
+        int i;
+
         mutex_lock(&clocks_mutex);
-        list_del(&clk->node);
+        for (i = 0; i < num; i++)
+                list_add(&clks[i].node, &clocks);
         mutex_unlock(&clocks_mutex);
 }
-EXPORT_SYMBOL(clk_unregister);
 
 static int __init clk_init(void)
 {
-        clk_register(&clk_gpio27);
+        clks_register(common_clks, ARRAY_SIZE(common_clks));
         return 0;
 }
 arch_initcall(clk_init);
diff --git a/arch/arm/mach-pxa/clock.h b/arch/arm/mach-pxa/clock.h
new file mode 100644
index 000000000000..bc6b77e1592e
--- /dev/null
+++ b/arch/arm/mach-pxa/clock.h
@@ -0,0 +1,43 @@
+struct clk;
+
+struct clkops {
+        void                    (*enable)(struct clk *);
+        void                    (*disable)(struct clk *);
+        unsigned long           (*getrate)(struct clk *);
+};
+
+struct clk {
+        struct list_head        node;
+        const char              *name;
+        struct device           *dev;
+        const struct clkops     *ops;
+        unsigned long           rate;
+        unsigned int            cken;
+        unsigned int            delay;
+        unsigned int            enabled;
+};
+
+#define INIT_CKEN(_name, _cken, _rate, _delay, _dev)    \
+        {                                               \
+                .name   = _name,                        \
+                .dev    = _dev,                         \
+                .ops    = &clk_cken_ops,                \
+                .rate   = _rate,                        \
+                .cken   = CKEN_##_cken,                 \
+                .delay  = _delay,                       \
+        }
+
+#define INIT_CK(_name, _cken, _ops, _dev)               \
+        {                                               \
+                .name   = _name,                        \
+                .dev    = _dev,                         \
+                .ops    = _ops,                         \
+                .cken   = CKEN_##_cken,                 \
+        }
+
+extern const struct clkops clk_cken_ops;
+
+void clk_cken_enable(struct clk *clk);
+void clk_cken_disable(struct clk *clk);
+
+void clks_register(struct clk *clks, size_t num);
diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c
index bcf3f0a78463..62a770121bfa 100644
--- a/arch/arm/mach-pxa/pxa25x.c
+++ b/arch/arm/mach-pxa/pxa25x.c
@@ -30,6 +30,7 @@
 
 #include "generic.h"
 #include "devices.h"
+#include "clock.h"
 
 /*
  * Various clock factors driven by the CCCR register.
@@ -94,6 +95,41 @@ unsigned int pxa25x_get_memclk_frequency_10khz(void)
         return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
 }
 
+static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk)
+{
+        return pxa25x_get_memclk_frequency_10khz() * 10000;
+}
+
+static const struct clkops clk_pxa25x_lcd_ops = {
+        .enable         = clk_cken_enable,
+        .disable        = clk_cken_disable,
+        .getrate        = clk_pxa25x_lcd_getrate,
+};
+
+/*
+ * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
+ * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
+ * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
+ */
+static struct clk pxa25x_clks[] = {
+        INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev),
+        INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev),
+        INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),
+        INIT_CKEN("UARTCLK", STUART, 14745600, 1, &pxa_device_stuart.dev),
+        INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),
+        INIT_CKEN("UDCCLK", USB, 47923000, 5, &pxa_device_udc.dev),
+        INIT_CKEN("MMCCLK", MMC, 19169000, 0, &pxa_device_mci.dev),
+        INIT_CKEN("I2CCLK", I2C, 31949000, 0, &pxa_device_i2c.dev),
+        /*
+        INIT_CKEN("PWMCLK",  PWM0, 3686400,  0, NULL),
+        INIT_CKEN("PWMCLK",  PWM0, 3686400,  0, NULL),
+        INIT_CKEN("SSPCLK",  SSP,  3686400,  0, NULL),
+        INIT_CKEN("I2SCLK",  I2S,  14745600, 0, NULL),
+        INIT_CKEN("NSSPCLK", NSSP, 3686400,  0, NULL),
+        INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL),
+        */
+};
+
 #ifdef CONFIG_PM
 
 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
@@ -215,6 +251,8 @@ static int __init pxa25x_init(void)
         int ret = 0;
 
         if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
+                clks_register(pxa25x_clks, ARRAY_SIZE(pxa25x_clks));
+
                 if ((ret = pxa_init_dma(16)))
                         return ret;
 #ifdef CONFIG_PM
diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index 3710981b72d8..433644edf791 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -27,6 +27,7 @@
 
 #include "generic.h"
 #include "devices.h"
+#include "clock.h"
 
 /* Crystal clock: 13MHz */
 #define BASE_CLK        13000000
@@ -120,6 +121,48 @@ unsigned int pxa27x_get_lcdclk_frequency_10khz(void)
         return (K / 10000);
 }
 
+static unsigned long clk_pxa27x_lcd_getrate(struct clk *clk)
+{
+        return pxa27x_get_lcdclk_frequency_10khz() * 10000;
+}
+
+static const struct clkops clk_pxa27x_lcd_ops = {
+        .enable         = clk_cken_enable,
+        .disable        = clk_cken_disable,
+        .getrate        = clk_pxa27x_lcd_getrate,
+};
+
+static struct clk pxa27x_clks[] = {
+        INIT_CK("LCDCLK", LCD,    &clk_pxa27x_lcd_ops, &pxa_device_fb.dev),
+        INIT_CK("CAMCLK", CAMERA, &clk_pxa27x_lcd_ops, NULL),
+
+        INIT_CKEN("UARTCLK", STUART, 14857000, 1, &pxa_device_stuart.dev),
+        INIT_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev),
+        INIT_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev),
+
+        INIT_CKEN("I2SCLK",  I2S,  14682000, 0, &pxa_device_i2s.dev),
+        INIT_CKEN("I2CCLK",  I2C,  32842000, 0, &pxa_device_i2c.dev),
+        INIT_CKEN("UDCCLK",  USB,  48000000, 5, &pxa_device_udc.dev),
+        INIT_CKEN("MMCCLK",  MMC,  19500000, 0, &pxa_device_mci.dev),
+        INIT_CKEN("FICPCLK", FICP, 48000000, 0, &pxa_device_ficp.dev),
+
+        INIT_CKEN("USBCLK", USB,    48000000, 0, &pxa27x_device_ohci.dev),
+        INIT_CKEN("I2CCLK", PWRI2C, 13000000, 0, &pxa27x_device_i2c_power.dev),
+        INIT_CKEN("KBDCLK", KEYPAD, 32768, 0, NULL),
+
+        /*
+        INIT_CKEN("PWMCLK",  PWM0, 13000000, 0, NULL),
+        INIT_CKEN("SSPCLK",  SSP1, 13000000, 0, NULL),
+        INIT_CKEN("SSPCLK",  SSP2, 13000000, 0, NULL),
+        INIT_CKEN("SSPCLK",  SSP3, 13000000, 0, NULL),
+        INIT_CKEN("MSLCLK",  MSL,  48000000, 0, NULL),
+        INIT_CKEN("USIMCLK", USIM, 48000000, 0, NULL),
+        INIT_CKEN("MSTKCLK", MEMSTK, 19500000, 0, NULL),
+        INIT_CKEN("IMCLK",   IM,   0, 0, NULL),
+        INIT_CKEN("MEMCLK",  MEMC, 0, 0, NULL),
+        */
+};
+
 #ifdef CONFIG_PM
 
 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
@@ -343,6 +386,8 @@ static int __init pxa27x_init(void)
 {
         int ret = 0;
         if (cpu_is_pxa27x()) {
+                clks_register(pxa27x_clks, ARRAY_SIZE(pxa27x_clks));
+
                 if ((ret = pxa_init_dma(32)))
                         return ret;
 #ifdef CONFIG_PM