Patchwork [U-Boot,v2] EXYNOS: Clock: Add common function for pll rate calculation

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Submitter Chander Kashyap
Date Oct. 15, 2012, 11:58 a.m.
Message ID <1350302280-4987-1-git-send-email-chander.kashyap@linaro.org>
Download mbox | patch
Permalink /patch/191547/
State Accepted
Delegated to: Minkyu Kang
Headers show

Comments

Chander Kashyap - Oct. 15, 2012, 11:58 a.m.
From: Minkyu Kang <mk7.kang@samsung.com>

Moved the common code to calculate pll clock rate to new function
exynos_get_pll_clk().

Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
---
Changes from v1:
	- Author name changed
 arch/arm/cpu/armv7/exynos/clock.c |  102 ++++++++++++++-----------------------
 1 file changed, 38 insertions(+), 64 deletions(-)
Minkyu Kang - Oct. 26, 2012, 8:19 a.m.
On 15 October 2012 20:58, Chander Kashyap <chander.kashyap@linaro.org> wrote:
> From: Minkyu Kang <mk7.kang@samsung.com>
>
> Moved the common code to calculate pll clock rate to new function
> exynos_get_pll_clk().
>
> Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
> ---
> Changes from v1:
>         - Author name changed
>  arch/arm/cpu/armv7/exynos/clock.c |  102 ++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 64 deletions(-)
>

applied to u-boot-samsung

Patch

diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
index 4f3b451..a042423 100644
--- a/arch/arm/cpu/armv7/exynos/clock.c
+++ b/arch/arm/cpu/armv7/exynos/clock.c
@@ -26,41 +26,19 @@ 
 #include <asm/arch/clock.h>
 #include <asm/arch/clk.h>
 
-/* exynos4: return pll clock frequency */
-static unsigned long exynos4_get_pll_clk(int pllreg)
+/* exynos: return pll clock frequency */
+static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k)
 {
-	struct exynos4_clock *clk =
-		(struct exynos4_clock *)samsung_get_base_clock();
-	unsigned long r, m, p, s, k = 0, mask, fout;
+	unsigned long m, p, s = 0, mask, fout;
 	unsigned int freq;
-
-	switch (pllreg) {
-	case APLL:
-		r = readl(&clk->apll_con0);
-		break;
-	case MPLL:
-		r = readl(&clk->mpll_con0);
-		break;
-	case EPLL:
-		r = readl(&clk->epll_con0);
-		k = readl(&clk->epll_con1);
-		break;
-	case VPLL:
-		r = readl(&clk->vpll_con0);
-		k = readl(&clk->vpll_con1);
-		break;
-	default:
-		printf("Unsupported PLL (%d)\n", pllreg);
-		return 0;
-	}
-
 	/*
 	 * APLL_CON: MIDV [25:16]
 	 * MPLL_CON: MIDV [25:16]
 	 * EPLL_CON: MIDV [24:16]
 	 * VPLL_CON: MIDV [24:16]
+	 * BPLL_CON: MIDV [25:16]: Exynos5
 	 */
-	if (pllreg == APLL || pllreg == MPLL)
+	if (pllreg == APLL || pllreg == MPLL || pllreg == BPLL)
 		mask = 0x3ff;
 	else
 		mask = 0x1ff;
@@ -92,13 +70,43 @@  static unsigned long exynos4_get_pll_clk(int pllreg)
 	return fout;
 }
 
+/* exynos4: return pll clock frequency */
+static unsigned long exynos4_get_pll_clk(int pllreg)
+{
+	struct exynos4_clock *clk =
+		(struct exynos4_clock *)samsung_get_base_clock();
+	unsigned long r, k = 0;
+
+	switch (pllreg) {
+	case APLL:
+		r = readl(&clk->apll_con0);
+		break;
+	case MPLL:
+		r = readl(&clk->mpll_con0);
+		break;
+	case EPLL:
+		r = readl(&clk->epll_con0);
+		k = readl(&clk->epll_con1);
+		break;
+	case VPLL:
+		r = readl(&clk->vpll_con0);
+		k = readl(&clk->vpll_con1);
+		break;
+	default:
+		printf("Unsupported PLL (%d)\n", pllreg);
+		return 0;
+	}
+
+	return exynos_get_pll_clk(pllreg, r, k);
+}
+
 /* exynos5: return pll clock frequency */
 static unsigned long exynos5_get_pll_clk(int pllreg)
 {
 	struct exynos5_clock *clk =
 		(struct exynos5_clock *)samsung_get_base_clock();
-	unsigned long r, m, p, s, k = 0, mask, fout;
-	unsigned int freq, pll_div2_sel, fout_sel;
+	unsigned long r, k = 0, fout;
+	unsigned int pll_div2_sel, fout_sel;
 
 	switch (pllreg) {
 	case APLL:
@@ -123,41 +131,7 @@  static unsigned long exynos5_get_pll_clk(int pllreg)
 		return 0;
 	}
 
-	/*
-	 * APLL_CON: MIDV [25:16]
-	 * MPLL_CON: MIDV [25:16]
-	 * EPLL_CON: MIDV [24:16]
-	 * VPLL_CON: MIDV [24:16]
-	 * BPLL_CON: MIDV [25:16]
-	 */
-	if (pllreg == APLL || pllreg == MPLL || pllreg == BPLL)
-		mask = 0x3ff;
-	else
-		mask = 0x1ff;
-
-	m = (r >> 16) & mask;
-
-	/* PDIV [13:8] */
-	p = (r >> 8) & 0x3f;
-	/* SDIV [2:0] */
-	s = r & 0x7;
-
-	freq = CONFIG_SYS_CLK_FREQ;
-
-	if (pllreg == EPLL) {
-		k = k & 0xffff;
-		/* FOUT = (MDIV + K / 65536) * FIN / (PDIV * 2^SDIV) */
-		fout = (m + k / 65536) * (freq / (p * (1 << s)));
-	} else if (pllreg == VPLL) {
-		k = k & 0xfff;
-		/* FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV) */
-		fout = (m + k / 1024) * (freq / (p * (1 << s)));
-	} else {
-		if (s < 1)
-			s = 1;
-		/* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */
-		fout = m * (freq / (p * (1 << (s - 1))));
-	}
+	fout = exynos_get_pll_clk(pllreg, r, k);
 
 	/* According to the user manual, in EVT1 MPLL and BPLL always gives
 	 * 1.6GHz clock, so divide by 2 to get 800MHz MPLL clock.*/