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Diffstat (limited to 'arch/arm/mach-davinci/clock.c')
-rw-r--r--arch/arm/mach-davinci/clock.c93
1 files changed, 39 insertions, 54 deletions
diff --git a/arch/arm/mach-davinci/clock.c b/arch/arm/mach-davinci/clock.c
index baece65cb9c0..bf6218ee94e1 100644
--- a/arch/arm/mach-davinci/clock.c
+++ b/arch/arm/mach-davinci/clock.c
@@ -49,7 +49,8 @@ static void __clk_disable(struct clk *clk)
{
if (WARN_ON(clk->usecount == 0))
return;
- if (--clk->usecount == 0 && !(clk->flags & CLK_PLL))
+ if (--clk->usecount == 0 && !(clk->flags & CLK_PLL) &&
+ (clk->flags & CLK_PSC))
davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc, 0);
if (clk->parent)
__clk_disable(clk->parent);
@@ -124,9 +125,10 @@ 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);
@@ -363,6 +365,7 @@ 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 +379,23 @@ 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 +409,7 @@ 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 +421,20 @@ 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)
+int __init davinci_clk_init(struct clk_lookup *clocks)
{
- struct davinci_clk *c;
+ 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) {
@@ -457,35 +457,23 @@ int __init davinci_clk_init(struct davinci_clk *clocks)
if (clk->lpsc)
clk->flags |= CLK_PSC;
- clkdev_add(&c->lk);
clk_register(clk);
+ num_clocks++;
/* Turn on clocks that Linux doesn't otherwise manage */
if (clk->flags & ALWAYS_ENABLED)
clk_enable(clk);
}
- return 0;
-}
-
-#ifdef CONFIG_PROC_FS
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
+ clkdev_add_table(clocks, num_clocks);
-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 +513,38 @@ 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 */