1 files changed, 222 insertions, 74 deletions

diff --git a/arch/arm/mach-davinci/clock.c b/arch/arm/mach-davinci/clock.c
index baece65cb9c..985e5fd00fb 100644
--- a/arch/arm/mach-davinci/clock.c
+++ b/arch/arm/mach-davinci/clock.c
@@ -22,6 +22,7 @@
 
 #include <mach/hardware.h>
 
+#include <mach/clock.h>
 #include <mach/psc.h>
 #include <mach/cputype.h>
 #include "clock.h"
@@ -30,31 +31,68 @@ static LIST_HEAD(clocks);
 static DEFINE_MUTEX(clocks_mutex);
 static DEFINE_SPINLOCK(clockfw_lock);
 
-static unsigned psc_domain(struct clk *clk)
-{
-	return (clk->flags & PSC_DSP)
-		? DAVINCI_GPSC_DSPDOMAIN
-		: DAVINCI_GPSC_ARMDOMAIN;
-}
-
 static void __clk_enable(struct clk *clk)
 {
 	if (clk->parent)
 		__clk_enable(clk->parent);
-	if (clk->usecount++ == 0 && (clk->flags & CLK_PSC))
-		davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc, 1);
+	if (clk->usecount++ == 0) {
+		if (clk->flags & CLK_PSC)
+			davinci_psc_config(clk->domain, clk->gpsc, clk->lpsc,
+					   true, clk->flags);
+		else if (clk->clk_enable)
+			clk->clk_enable(clk);
+	}
 }
 
 static void __clk_disable(struct clk *clk)
 {
 	if (WARN_ON(clk->usecount == 0))
 		return;
-	if (--clk->usecount == 0 && !(clk->flags & CLK_PLL))
-		davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc, 0);
+	if (--clk->usecount == 0) {
+		if (!(clk->flags & CLK_PLL) && (clk->flags & CLK_PSC))
+			davinci_psc_config(clk->domain, clk->gpsc, clk->lpsc,
+					   false, clk->flags);
+		else if (clk->clk_disable)
+			clk->clk_disable(clk);
+	}
 	if (clk->parent)
 		__clk_disable(clk->parent);
 }
 
+int davinci_clk_reset(struct clk *clk, bool reset)
+{
+	unsigned long flags;
+
+	if (clk == NULL || IS_ERR(clk))
+		return -EINVAL;
+
+	spin_lock_irqsave(&clockfw_lock, flags);
+	if (clk->flags & CLK_PSC)
+		davinci_psc_reset(clk->gpsc, clk->lpsc, reset);
+	spin_unlock_irqrestore(&clockfw_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(davinci_clk_reset);
+
+int davinci_clk_reset_assert(struct clk *clk)
+{
+	if (clk == NULL || IS_ERR(clk) || !clk->reset)
+		return -EINVAL;
+
+	return clk->reset(clk, true);
+}
+EXPORT_SYMBOL(davinci_clk_reset_assert);
+
+int davinci_clk_reset_deassert(struct clk *clk)
+{
+	if (clk == NULL || IS_ERR(clk) || !clk->reset)
+		return -EINVAL;
+
+	return clk->reset(clk, false);
+}
+EXPORT_SYMBOL(davinci_clk_reset_deassert);
+
 int clk_enable(struct clk *clk)
 {
 	unsigned long flags;
@@ -95,7 +133,7 @@ EXPORT_SYMBOL(clk_get_rate);
 long clk_round_rate(struct clk *clk, unsigned long rate)
 {
 	if (clk == NULL || IS_ERR(clk))
-		return -EINVAL;
+		return 0;
 
 	if (clk->round_rate)
 		return clk->round_rate(clk, rate);
@@ -124,9 +162,10 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
 	if (clk == NULL || IS_ERR(clk))
 		return ret;
 
-	spin_lock_irqsave(&clockfw_lock, flags);
 	if (clk->set_rate)
 		ret = clk->set_rate(clk, rate);
+
+	spin_lock_irqsave(&clockfw_lock, flags);
 	if (ret == 0) {
 		if (clk->recalc)
 			clk->rate = clk->recalc(clk);
@@ -215,7 +254,7 @@ EXPORT_SYMBOL(clk_unregister);
 /*
  * Disable any unused clocks left on by the bootloader
  */
-static int __init clk_disable_unused(void)
+int __init davinci_clk_disable_unused(void)
 {
 	struct clk *ck;
 
@@ -230,14 +269,15 @@ static int __init clk_disable_unused(void)
 		if (!davinci_psc_is_clk_active(ck->gpsc, ck->lpsc))
 			continue;
 
-		pr_info("Clocks: disable unused %s\n", ck->name);
-		davinci_psc_config(psc_domain(ck), ck->gpsc, ck->lpsc, 0);
+		pr_debug("Clocks: disable unused %s\n", ck->name);
+
+		davinci_psc_config(ck->domain, ck->gpsc, ck->lpsc,
+				false, ck->flags);
 	}
 	spin_unlock_irq(&clockfw_lock);
 
 	return 0;
 }
-late_initcall(clk_disable_unused);
 #endif
 
 static unsigned long clk_sysclk_recalc(struct clk *clk)
@@ -270,7 +310,7 @@ static unsigned long clk_sysclk_recalc(struct clk *clk)
 
 	v = __raw_readl(pll->base + clk->div_reg);
 	if (v & PLLDIV_EN) {
-		plldiv = (v & PLLDIV_RATIO_MASK) + 1;
+		plldiv = (v & pll->div_ratio_mask) + 1;
 		if (plldiv)
 			rate /= plldiv;
 	}
@@ -278,6 +318,79 @@ static unsigned long clk_sysclk_recalc(struct clk *clk)
 	return rate;
 }
 
+int davinci_set_sysclk_rate(struct clk *clk, unsigned long rate)
+{
+	unsigned v;
+	struct pll_data *pll;
+	unsigned long input;
+	unsigned ratio = 0;
+
+	/* If this is the PLL base clock, wrong function to call */
+	if (clk->pll_data)
+		return -EINVAL;
+
+	/* There must be a parent... */
+	if (WARN_ON(!clk->parent))
+		return -EINVAL;
+
+	/* ... the parent must be a PLL... */
+	if (WARN_ON(!clk->parent->pll_data))
+		return -EINVAL;
+
+	/* ... and this clock must have a divider. */
+	if (WARN_ON(!clk->div_reg))
+		return -EINVAL;
+
+	pll = clk->parent->pll_data;
+
+	input = clk->parent->rate;
+
+	/* If pre-PLL, source clock is before the multiplier and divider(s) */
+	if (clk->flags & PRE_PLL)
+		input = pll->input_rate;
+
+	if (input > rate) {
+		/*
+		 * Can afford to provide an output little higher than requested
+		 * only if maximum rate supported by hardware on this sysclk
+		 * is known.
+		 */
+		if (clk->maxrate) {
+			ratio = DIV_ROUND_CLOSEST(input, rate);
+			if (input / ratio > clk->maxrate)
+				ratio = 0;
+		}
+
+		if (ratio == 0)
+			ratio = DIV_ROUND_UP(input, rate);
+
+		ratio--;
+	}
+
+	if (ratio > pll->div_ratio_mask)
+		return -EINVAL;
+
+	do {
+		v = __raw_readl(pll->base + PLLSTAT);
+	} while (v & PLLSTAT_GOSTAT);
+
+	v = __raw_readl(pll->base + clk->div_reg);
+	v &= ~pll->div_ratio_mask;
+	v |= ratio | PLLDIV_EN;
+	__raw_writel(v, pll->base + clk->div_reg);
+
+	v = __raw_readl(pll->base + PLLCMD);
+	v |= PLLCMD_GOSET;
+	__raw_writel(v, pll->base + PLLCMD);
+
+	do {
+		v = __raw_readl(pll->base + PLLSTAT);
+	} while (v & PLLSTAT_GOSTAT);
+
+	return 0;
+}
+EXPORT_SYMBOL(davinci_set_sysclk_rate);
+
 static unsigned long clk_leafclk_recalc(struct clk *clk)
 {
 	if (WARN_ON(!clk->parent))
@@ -286,6 +399,12 @@ static unsigned long clk_leafclk_recalc(struct clk *clk)
 	return clk->parent->rate;
 }
 
+int davinci_simple_set_rate(struct clk *clk, unsigned long rate)
+{
+	clk->rate = rate;
+	return 0;
+}
+
 static unsigned long clk_pllclk_recalc(struct clk *clk)
 {
 	u32 ctrl, mult = 1, prediv = 1, postdiv = 1;
@@ -293,7 +412,6 @@ static unsigned long clk_pllclk_recalc(struct clk *clk)
 	struct pll_data *pll = clk->pll_data;
 	unsigned long rate = clk->rate;
 
-	pll->base = IO_ADDRESS(pll->phys_base);
 	ctrl = __raw_readl(pll->base + PLLCTL);
 	rate = pll->input_rate = clk->parent->rate;
 
@@ -310,7 +428,7 @@ static unsigned long clk_pllclk_recalc(struct clk *clk)
 	if (pll->flags & PLL_HAS_PREDIV) {
 		prediv = __raw_readl(pll->base + PREDIV);
 		if (prediv & PLLDIV_EN)
-			prediv = (prediv & PLLDIV_RATIO_MASK) + 1;
+			prediv = (prediv & pll->div_ratio_mask) + 1;
 		else
 			prediv = 1;
 	}
@@ -322,7 +440,7 @@ static unsigned long clk_pllclk_recalc(struct clk *clk)
 	if (pll->flags & PLL_HAS_POSTDIV) {
 		postdiv = __raw_readl(pll->base + POSTDIV);
 		if (postdiv & PLLDIV_EN)
-			postdiv = (postdiv & PLLDIV_RATIO_MASK) + 1;
+			postdiv = (postdiv & pll->div_ratio_mask) + 1;
 		else
 			postdiv = 1;
 	}
@@ -363,6 +481,7 @@ int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv,
 {
 	u32 ctrl;
 	unsigned int locktime;
+	unsigned long flags;
 
 	if (pll->base == NULL)
 		return -EINVAL;
@@ -376,25 +495,23 @@ int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv,
 		locktime = ((2000 * prediv) / 100);
 		prediv = (prediv - 1) | PLLDIV_EN;
 	} else {
-		locktime = 20;
+		locktime = PLL_LOCK_TIME;
 	}
 	if (postdiv)
 		postdiv = (postdiv - 1) | PLLDIV_EN;
 	if (mult)
 		mult = mult - 1;
 
+	/* Protect against simultaneous calls to PLL setting seqeunce */
+	spin_lock_irqsave(&clockfw_lock, flags);
+
 	ctrl = __raw_readl(pll->base + PLLCTL);
 
 	/* Switch the PLL to bypass mode */
 	ctrl &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
 	__raw_writel(ctrl, pll->base + PLLCTL);
 
-	/*
-	 * Wait for 4 OSCIN/CLKIN cycles to ensure that the PLLC has switched
-	 * to bypass mode. Delay of 1us ensures we are good for all > 4MHz
-	 * OSCIN/CLKIN inputs. Typically the input is ~25MHz.
-	 */
-	udelay(1);
+	udelay(PLL_BYPASS_TIME);
 
 	/* Reset and enable PLL */
 	ctrl &= ~(PLLCTL_PLLRST | PLLCTL_PLLDIS);
@@ -408,11 +525,7 @@ int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv,
 	if (pll->flags & PLL_HAS_POSTDIV)
 		__raw_writel(postdiv, pll->base + POSTDIV);
 
-	/*
-	 * Wait for PLL to reset properly, OMAP-L138 datasheet says
-	 * 'min' time = 125ns
-	 */
-	udelay(1);
+	udelay(PLL_RESET_TIME);
 
 	/* Bring PLL out of reset */
 	ctrl |= PLLCTL_PLLRST;
@@ -424,17 +537,52 @@ int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv,
 	ctrl |= PLLCTL_PLLEN;
 	__raw_writel(ctrl, pll->base + PLLCTL);
 
+	spin_unlock_irqrestore(&clockfw_lock, flags);
+
 	return 0;
 }
 EXPORT_SYMBOL(davinci_set_pllrate);
 
-int __init davinci_clk_init(struct davinci_clk *clocks)
-  {
-	struct davinci_clk *c;
+/**
+ * davinci_set_refclk_rate() - Set the reference clock rate
+ * @rate:	The new rate.
+ *
+ * Sets the reference clock rate to a given value. This will most likely
+ * result in the entire clock tree getting updated.
+ *
+ * This is used to support boards which use a reference clock different
+ * than that used by default in <soc>.c file. The reference clock rate
+ * should be updated early in the boot process; ideally soon after the
+ * clock tree has been initialized once with the default reference clock
+ * rate (davinci_common_init()).
+ *
+ * Returns 0 on success, error otherwise.
+ */
+int davinci_set_refclk_rate(unsigned long rate)
+{
+	struct clk *refclk;
+
+	refclk = clk_get(NULL, "ref");
+	if (IS_ERR(refclk)) {
+		pr_err("%s: failed to get reference clock.\n", __func__);
+		return PTR_ERR(refclk);
+	}
+
+	clk_set_rate(refclk, rate);
+
+	clk_put(refclk);
+
+	return 0;
+}
+
+int __init davinci_clk_init(struct clk_lookup *clocks)
+{
+	struct clk_lookup *c;
 	struct clk *clk;
+	size_t num_clocks = 0;
 
-	for (c = clocks; c->lk.clk; c++) {
-		clk = c->lk.clk;
+	for (c = clocks; c->clk; c++) {
+		clk = c->clk;
 
 		if (!clk->recalc) {
 
@@ -451,41 +599,44 @@ int __init davinci_clk_init(struct davinci_clk *clocks)
 				clk->recalc = clk_leafclk_recalc;
 		}
 
+		if (clk->pll_data) {
+			struct pll_data *pll = clk->pll_data;
+
+			if (!pll->div_ratio_mask)
+				pll->div_ratio_mask = PLLDIV_RATIO_MASK;
+
+			if (pll->phys_base && !pll->base) {
+				pll->base = ioremap(pll->phys_base, SZ_4K);
+				WARN_ON(!pll->base);
+			}
+		}
+
 		if (clk->recalc)
 			clk->rate = clk->recalc(clk);
 
 		if (clk->lpsc)
 			clk->flags |= CLK_PSC;
 
-		clkdev_add(&c->lk);
+		if (clk->flags & PSC_LRST)
+			clk->reset = davinci_clk_reset;
+
 		clk_register(clk);
+		num_clocks++;
 
 		/* Turn on clocks that Linux doesn't otherwise manage */
 		if (clk->flags & ALWAYS_ENABLED)
 			clk_enable(clk);
 	}
 
-	return 0;
-}
+	clkdev_add_table(clocks, num_clocks);
 
-#ifdef CONFIG_PROC_FS
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-
-static void *davinci_ck_start(struct seq_file *m, loff_t *pos)
-{
-	return *pos < 1 ? (void *)1 : NULL;
+	return 0;
 }
 
-static void *davinci_ck_next(struct seq_file *m, void *v, loff_t *pos)
-{
-	++*pos;
-	return NULL;
-}
+#ifdef CONFIG_DEBUG_FS
 
-static void davinci_ck_stop(struct seq_file *m, void *v)
-{
-}
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 
 #define CLKNAME_MAX	10		/* longest clock name */
 #define NEST_DELTA	2
@@ -525,41 +676,38 @@ dump_clock(struct seq_file *s, unsigned nest, struct clk *parent)
 
 static int davinci_ck_show(struct seq_file *m, void *v)
 {
-	/* Show clock tree; we know the main oscillator is first.
-	 * We trust nonzero usecounts equate to PSC enables...
+	struct clk *clk;
+
+	/*
+	 * Show clock tree; We trust nonzero usecounts equate to PSC enables...
 	 */
 	mutex_lock(&clocks_mutex);
-	if (!list_empty(&clocks))
-		dump_clock(m, 0, list_first_entry(&clocks, struct clk, node));
+	list_for_each_entry(clk, &clocks, node)
+		if (!clk->parent)
+			dump_clock(m, 0, clk);
 	mutex_unlock(&clocks_mutex);
 
 	return 0;
 }
 
-static const struct seq_operations davinci_ck_op = {
-	.start	= davinci_ck_start,
-	.next	= davinci_ck_next,
-	.stop	= davinci_ck_stop,
-	.show	= davinci_ck_show
-};
-
 static int davinci_ck_open(struct inode *inode, struct file *file)
 {
-	return seq_open(file, &davinci_ck_op);
+	return single_open(file, davinci_ck_show, NULL);
 }
 
-static const struct file_operations proc_davinci_ck_operations = {
+static const struct file_operations davinci_ck_operations = {
 	.open		= davinci_ck_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
-	.release	= seq_release,
+	.release	= single_release,
 };
 
-static int __init davinci_ck_proc_init(void)
+static int __init davinci_clk_debugfs_init(void)
 {
-	proc_create("davinci_clocks", 0, NULL, &proc_davinci_ck_operations);
+	debugfs_create_file("davinci_clocks", S_IFREG | S_IRUGO, NULL, NULL,
+						&davinci_ck_operations);
 	return 0;
 
 }
-__initcall(davinci_ck_proc_init);
-#endif /* CONFIG_DEBUG_PROC_FS */
+device_initcall(davinci_clk_debugfs_init);
+#endif /* CONFIG_DEBUG_FS */