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path: root/drivers/clk/clk-vt8500.c
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Diffstat (limited to 'drivers/clk/clk-vt8500.c')
-rw-r--r--drivers/clk/clk-vt8500.c100
1 files changed, 71 insertions, 29 deletions
diff --git a/drivers/clk/clk-vt8500.c b/drivers/clk/clk-vt8500.c
index 37e928846..b0f76a84f 100644
--- a/drivers/clk/clk-vt8500.c
+++ b/drivers/clk/clk-vt8500.c
@@ -355,7 +355,7 @@ CLK_OF_DECLARE(vt8500_device, "via,vt8500-device-clock", vtwm_device_clk_init);
#define WM8850_BITS_TO_VAL(m, d1, d2) \
((((m / 2) - 1) << 16) | ((d1 - 1) << 8) | d2)
-static void vt8500_find_pll_bits(unsigned long rate, unsigned long parent_rate,
+static int vt8500_find_pll_bits(unsigned long rate, unsigned long parent_rate,
u32 *multiplier, u32 *prediv)
{
unsigned long tclk;
@@ -365,7 +365,7 @@ static void vt8500_find_pll_bits(unsigned long rate, unsigned long parent_rate,
pr_err("%s: requested rate out of range\n", __func__);
*multiplier = 0;
*prediv = 1;
- return;
+ return -EINVAL;
}
if (rate <= parent_rate * 31)
/* use the prediv to double the resolution */
@@ -379,12 +379,15 @@ static void vt8500_find_pll_bits(unsigned long rate, unsigned long parent_rate,
if (tclk != rate)
pr_warn("%s: requested rate %lu, found rate %lu\n", __func__,
rate, tclk);
+
+ return 0;
}
-static void wm8650_find_pll_bits(unsigned long rate, unsigned long parent_rate,
+static int wm8650_find_pll_bits(unsigned long rate, unsigned long parent_rate,
u32 *multiplier, u32 *divisor1, u32 *divisor2)
{
- u32 mul, div1, div2;
+ u32 mul, div1;
+ int div2;
u32 best_mul, best_div1, best_div2;
unsigned long tclk, rate_err, best_err;
@@ -403,7 +406,7 @@ static void wm8650_find_pll_bits(unsigned long rate, unsigned long parent_rate,
*multiplier = mul;
*divisor1 = div1;
*divisor2 = div2;
- return;
+ return 0;
}
if (rate_err < best_err) {
@@ -414,12 +417,19 @@ static void wm8650_find_pll_bits(unsigned long rate, unsigned long parent_rate,
}
}
+ if (best_err == (unsigned long)-1) {
+ pr_warn("%s: impossible rate %lu\n", __func__, rate);
+ return -EINVAL;
+ }
+
/* if we got here, it wasn't an exact match */
pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
rate - best_err);
*multiplier = best_mul;
*divisor1 = best_div1;
*divisor2 = best_div2;
+
+ return 0;
}
static u32 wm8750_get_filter(u32 parent_rate, u32 divisor1)
@@ -449,10 +459,11 @@ static u32 wm8750_get_filter(u32 parent_rate, u32 divisor1)
return 0;
}
-static void wm8750_find_pll_bits(unsigned long rate, unsigned long parent_rate,
+static int wm8750_find_pll_bits(unsigned long rate, unsigned long parent_rate,
u32 *filter, u32 *multiplier, u32 *divisor1, u32 *divisor2)
{
- u32 mul, div1, div2;
+ u32 mul;
+ int div1, div2;
u32 best_mul, best_div1, best_div2;
unsigned long tclk, rate_err, best_err;
@@ -472,7 +483,7 @@ static void wm8750_find_pll_bits(unsigned long rate, unsigned long parent_rate,
*multiplier = mul;
*divisor1 = div1;
*divisor2 = div2;
- return;
+ return 0;
}
if (rate_err < best_err) {
@@ -483,6 +494,11 @@ static void wm8750_find_pll_bits(unsigned long rate, unsigned long parent_rate,
}
}
+ if (best_err == (unsigned long)-1) {
+ pr_warn("%s: impossible rate %lu\n", __func__, rate);
+ return -EINVAL;
+ }
+
/* if we got here, it wasn't an exact match */
pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
rate - best_err);
@@ -491,12 +507,15 @@ static void wm8750_find_pll_bits(unsigned long rate, unsigned long parent_rate,
*multiplier = best_mul;
*divisor1 = best_div1;
*divisor2 = best_div2;
+
+ return 0;
}
-static void wm8850_find_pll_bits(unsigned long rate, unsigned long parent_rate,
+static int wm8850_find_pll_bits(unsigned long rate, unsigned long parent_rate,
u32 *multiplier, u32 *divisor1, u32 *divisor2)
{
- u32 mul, div1, div2;
+ u32 mul;
+ int div1, div2;
u32 best_mul, best_div1, best_div2;
unsigned long tclk, rate_err, best_err;
@@ -516,7 +535,7 @@ static void wm8850_find_pll_bits(unsigned long rate, unsigned long parent_rate,
*multiplier = mul;
*divisor1 = div1;
*divisor2 = div2;
- return;
+ return 0;
}
if (rate_err < best_err) {
@@ -527,6 +546,11 @@ static void wm8850_find_pll_bits(unsigned long rate, unsigned long parent_rate,
}
}
+ if (best_err == (unsigned long)-1) {
+ pr_warn("%s: impossible rate %lu\n", __func__, rate);
+ return -EINVAL;
+ }
+
/* if we got here, it wasn't an exact match */
pr_warn("%s: requested rate %lu, found rate %lu\n", __func__, rate,
rate - best_err);
@@ -534,6 +558,8 @@ static void wm8850_find_pll_bits(unsigned long rate, unsigned long parent_rate,
*multiplier = best_mul;
*divisor1 = best_div1;
*divisor2 = best_div2;
+
+ return 0;
}
static int vtwm_pll_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -543,31 +569,39 @@ static int vtwm_pll_set_rate(struct clk_hw *hw, unsigned long rate,
u32 filter, mul, div1, div2;
u32 pll_val;
unsigned long flags = 0;
+ int ret;
/* sanity check */
switch (pll->type) {
case PLL_TYPE_VT8500:
- vt8500_find_pll_bits(rate, parent_rate, &mul, &div1);
- pll_val = VT8500_BITS_TO_VAL(mul, div1);
+ ret = vt8500_find_pll_bits(rate, parent_rate, &mul, &div1);
+ if (!ret)
+ pll_val = VT8500_BITS_TO_VAL(mul, div1);
break;
case PLL_TYPE_WM8650:
- wm8650_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
- pll_val = WM8650_BITS_TO_VAL(mul, div1, div2);
+ ret = wm8650_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
+ if (!ret)
+ pll_val = WM8650_BITS_TO_VAL(mul, div1, div2);
break;
case PLL_TYPE_WM8750:
- wm8750_find_pll_bits(rate, parent_rate, &filter, &mul, &div1, &div2);
- pll_val = WM8750_BITS_TO_VAL(filter, mul, div1, div2);
+ ret = wm8750_find_pll_bits(rate, parent_rate, &filter, &mul, &div1, &div2);
+ if (!ret)
+ pll_val = WM8750_BITS_TO_VAL(filter, mul, div1, div2);
break;
case PLL_TYPE_WM8850:
- wm8850_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
- pll_val = WM8850_BITS_TO_VAL(mul, div1, div2);
+ ret = wm8850_find_pll_bits(rate, parent_rate, &mul, &div1, &div2);
+ if (!ret)
+ pll_val = WM8850_BITS_TO_VAL(mul, div1, div2);
break;
default:
pr_err("%s: invalid pll type\n", __func__);
- return 0;
+ ret = -EINVAL;
}
+ if (ret)
+ return ret;
+
spin_lock_irqsave(pll->lock, flags);
vt8500_pmc_wait_busy();
@@ -585,28 +619,36 @@ static long vtwm_pll_round_rate(struct clk_hw *hw, unsigned long rate,
struct clk_pll *pll = to_clk_pll(hw);
u32 filter, mul, div1, div2;
long round_rate;
+ int ret;
switch (pll->type) {
case PLL_TYPE_VT8500:
- vt8500_find_pll_bits(rate, *prate, &mul, &div1);
- round_rate = VT8500_BITS_TO_FREQ(*prate, mul, div1);
+ ret = vt8500_find_pll_bits(rate, *prate, &mul, &div1);
+ if (!ret)
+ round_rate = VT8500_BITS_TO_FREQ(*prate, mul, div1);
break;
case PLL_TYPE_WM8650:
- wm8650_find_pll_bits(rate, *prate, &mul, &div1, &div2);
- round_rate = WM8650_BITS_TO_FREQ(*prate, mul, div1, div2);
+ ret = wm8650_find_pll_bits(rate, *prate, &mul, &div1, &div2);
+ if (!ret)
+ round_rate = WM8650_BITS_TO_FREQ(*prate, mul, div1, div2);
break;
case PLL_TYPE_WM8750:
- wm8750_find_pll_bits(rate, *prate, &filter, &mul, &div1, &div2);
- round_rate = WM8750_BITS_TO_FREQ(*prate, mul, div1, div2);
+ ret = wm8750_find_pll_bits(rate, *prate, &filter, &mul, &div1, &div2);
+ if (!ret)
+ round_rate = WM8750_BITS_TO_FREQ(*prate, mul, div1, div2);
break;
case PLL_TYPE_WM8850:
- wm8850_find_pll_bits(rate, *prate, &mul, &div1, &div2);
- round_rate = WM8850_BITS_TO_FREQ(*prate, mul, div1, div2);
+ ret = wm8850_find_pll_bits(rate, *prate, &mul, &div1, &div2);
+ if (!ret)
+ round_rate = WM8850_BITS_TO_FREQ(*prate, mul, div1, div2);
break;
default:
- round_rate = 0;
+ ret = -EINVAL;
}
+ if (ret)
+ return ret;
+
return round_rate;
}
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