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Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/asic3.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
index ad3c59135990..ebe889392b6d 100644
--- a/drivers/mfd/asic3.c
+++ b/drivers/mfd/asic3.c
@@ -25,6 +25,48 @@
#include <linux/mfd/asic3.h>
+enum {
+ ASIC3_CLOCK_SPI,
+ ASIC3_CLOCK_OWM,
+ ASIC3_CLOCK_PWM0,
+ ASIC3_CLOCK_PWM1,
+ ASIC3_CLOCK_LED0,
+ ASIC3_CLOCK_LED1,
+ ASIC3_CLOCK_LED2,
+ ASIC3_CLOCK_SD_HOST,
+ ASIC3_CLOCK_SD_BUS,
+ ASIC3_CLOCK_SMBUS,
+ ASIC3_CLOCK_EX0,
+ ASIC3_CLOCK_EX1,
+};
+
+struct asic3_clk {
+ int enabled;
+ unsigned int cdex;
+ unsigned long rate;
+};
+
+#define INIT_CDEX(_name, _rate) \
+ [ASIC3_CLOCK_##_name] = { \
+ .cdex = CLOCK_CDEX_##_name, \
+ .rate = _rate, \
+ }
+
+struct asic3_clk asic3_clk_init[] __initdata = {
+ INIT_CDEX(SPI, 0),
+ INIT_CDEX(OWM, 5000000),
+ INIT_CDEX(PWM0, 0),
+ INIT_CDEX(PWM1, 0),
+ INIT_CDEX(LED0, 0),
+ INIT_CDEX(LED1, 0),
+ INIT_CDEX(LED2, 0),
+ INIT_CDEX(SD_HOST, 24576000),
+ INIT_CDEX(SD_BUS, 12288000),
+ INIT_CDEX(SMBUS, 0),
+ INIT_CDEX(EX0, 32768),
+ INIT_CDEX(EX1, 24576000),
+};
+
struct asic3 {
void __iomem *mapping;
unsigned int bus_shift;
@@ -34,6 +76,8 @@ struct asic3 {
u16 irq_bothedge[4];
struct gpio_chip gpio;
struct device *dev;
+
+ struct asic3_clk clocks[ARRAY_SIZE(asic3_clk_init)];
};
static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset);
@@ -540,6 +584,37 @@ static int asic3_gpio_remove(struct platform_device *pdev)
return gpiochip_remove(&asic->gpio);
}
+static int asic3_clk_enable(struct asic3 *asic, struct asic3_clk *clk)
+{
+ unsigned long flags;
+ u32 cdex;
+
+ spin_lock_irqsave(&asic->lock, flags);
+ if (clk->enabled++ == 0) {
+ cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
+ cdex |= clk->cdex;
+ asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
+ }
+ spin_unlock_irqrestore(&asic->lock, flags);
+
+ return 0;
+}
+
+static void asic3_clk_disable(struct asic3 *asic, struct asic3_clk *clk)
+{
+ unsigned long flags;
+ u32 cdex;
+
+ WARN_ON(clk->enabled == 0);
+
+ spin_lock_irqsave(&asic->lock, flags);
+ if (--clk->enabled == 0) {
+ cdex = asic3_read_register(asic, ASIC3_OFFSET(CLOCK, CDEX));
+ cdex &= ~clk->cdex;
+ asic3_write_register(asic, ASIC3_OFFSET(CLOCK, CDEX), cdex);
+ }
+ spin_unlock_irqrestore(&asic->lock, flags);
+}
/* Core */
static int __init asic3_probe(struct platform_device *pdev)
@@ -605,6 +680,11 @@ static int __init asic3_probe(struct platform_device *pdev)
goto out_irq;
}
+ /* Making a per-device copy is only needed for the
+ * theoretical case of multiple ASIC3s on one board:
+ */
+ memcpy(asic->clocks, asic3_clk_init, sizeof(asic3_clk_init));
+
dev_info(asic->dev, "ASIC3 Core driver\n");
return 0;