[U-Boot] [PATCH V2 2/2] imx: mx6ul/sx: fix mmdc_ch0 clk calculation

[Peng Fan <van.freenix@gmail.com>]

From: Peng Fan <peng.fan@nxp.com>

Check "Figure 19-5. BUS clock generation" of i.MX 6SoloX Applications
Processor Reference Manual and "Figure 18-5. BUS clock generation" of
i.MX 6UltraLite Applications Processor Reference Manual. If mmdc clk
sources from pll4_main_clk(pll_audio), the calculation is wrong.

Fix mmdc_ch0 clk calculation. Also add PLL_AUDIO/VIDEO support
for decode_pll.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
---

Changes V2:
 Address Eric's comemnts about indent format. Use pmu_misc2_audio_div, but not
 misc2_audio_div.
 Define macro to simplify c code.

 arch/arm/cpu/armv7/mx6/clock.c           | 61 +++++++++++++++++++++++++++++---
 arch/arm/include/asm/arch-mx6/crm_regs.h | 12 +++++++
 2 files changed, 69 insertions(+), 4 deletions(-)

diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c
index 64514b1..27a3f2f 100644
--- a/arch/arm/cpu/armv7/mx6/clock.c
+++ b/arch/arm/cpu/armv7/mx6/clock.c
@@ -18,6 +18,8 @@ enum pll_clocks {
 	PLL_BUS,	/* System Bus PLL*/
 	PLL_USBOTG,	/* OTG USB PLL */
 	PLL_ENET,	/* ENET PLL */
+	PLL_AUDIO,	/* AUDIO PLL */
+	PLL_VIDEO,	/* AUDIO PLL */
 };
 
 struct mxc_ccm_reg *imx_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
@@ -204,7 +206,7 @@ int enable_spi_clk(unsigned char enable, unsigned spi_num)
 }
 static u32 decode_pll(enum pll_clocks pll, u32 infreq)
 {
-	u32 div;
+	u32 div, test_div, pll_num, pll_denom;
 
 	switch (pll) {
 	case PLL_SYS:
@@ -227,6 +229,44 @@ static u32 decode_pll(enum pll_clocks pll, u32 infreq)
 		div &= BM_ANADIG_PLL_ENET_DIV_SELECT;
 
 		return 25000000 * (div + (div >> 1) + 1);
+	case PLL_AUDIO:
+		div = __raw_readl(&imx_ccm->analog_pll_audio);
+		if (!(div & BM_ANADIG_PLL_AUDIO_ENABLE))
+			return 0;
+		/* BM_ANADIG_PLL_AUDIO_BYPASS_CLK_SRC is ignored */
+		if (div & BM_ANADIG_PLL_AUDIO_BYPASS)
+			return MXC_HCLK;
+		pll_num = __raw_readl(&imx_ccm->analog_pll_audio_num);
+		pll_denom = __raw_readl(&imx_ccm->analog_pll_audio_denom);
+		test_div = (div & BM_ANADIG_PLL_AUDIO_TEST_DIV_SELECT) >>
+			BP_ANADIG_PLL_AUDIO_TEST_DIV_SELECT;
+		div &= BM_ANADIG_PLL_AUDIO_DIV_SELECT;
+		if (test_div == 3) {
+			debug("Error test_div\n");
+			return 0;
+		}
+		test_div = 1 << (2 - test_div);
+
+		return infreq * (div + pll_num / pll_denom) / test_div;
+	case PLL_VIDEO:
+		div = __raw_readl(&imx_ccm->analog_pll_video);
+		if (!(div & BM_ANADIG_PLL_VIDEO_ENABLE))
+			return 0;
+		/* BM_ANADIG_PLL_AUDIO_BYPASS_CLK_SRC is ignored */
+		if (div & BM_ANADIG_PLL_VIDEO_BYPASS)
+			return MXC_HCLK;
+		pll_num = __raw_readl(&imx_ccm->analog_pll_video_num);
+		pll_denom = __raw_readl(&imx_ccm->analog_pll_video_denom);
+		test_div = (div & BM_ANADIG_PLL_VIDEO_POST_DIV_SELECT) >>
+			BP_ANADIG_PLL_VIDEO_POST_DIV_SELECT;
+		div &= BM_ANADIG_PLL_VIDEO_DIV_SELECT;
+		if (test_div == 3) {
+			debug("Error test_div\n");
+			return 0;
+		}
+		test_div = 1 << (2 - test_div);
+
+		return infreq * (div + pll_num / pll_denom) / test_div;
 	default:
 		return 0;
 	}
@@ -437,7 +477,7 @@ static u32 get_mmdc_ch0_clk(void)
 	u32 cbcmr = __raw_readl(&imx_ccm->cbcmr);
 	u32 cbcdr = __raw_readl(&imx_ccm->cbcdr);
 
-	u32 freq, podf, per2_clk2_podf;
+	u32 freq, podf, per2_clk2_podf, pmu_misc2_audio_div;
 
 	if (is_cpu_type(MXC_CPU_MX6SX) || is_cpu_type(MXC_CPU_MX6UL) ||
 	    is_cpu_type(MXC_CPU_MX6SL)) {
@@ -472,8 +512,21 @@ static u32 get_mmdc_ch0_clk(void)
 				freq = mxc_get_pll_pfd(PLL_BUS, 0);
 				break;
 			case 3:
-				/* static / 2 divider */
-				freq =  mxc_get_pll_pfd(PLL_BUS, 2) / 2;
+				pmu_misc2_audio_div = PMU_MISC2_AUDIO_DIV(__raw_readl(&imx_ccm->pmu_misc2));
+				switch (pmu_misc2_audio_div) {
+				case 0:
+				case 2:
+					pmu_misc2_audio_div = 1;
+					break;
+				case 1:
+					pmu_misc2_audio_div = 2;
+					break;
+				case 3:
+					pmu_misc2_audio_div = 4;
+					break;
+				}
+				freq = decode_pll(PLL_AUDIO, MXC_HCLK) /
+					pmu_misc2_audio_div;
 				break;
 			}
 		}
diff --git a/arch/arm/include/asm/arch-mx6/crm_regs.h b/arch/arm/include/asm/arch-mx6/crm_regs.h
index f6ec09d..d9254ba 100644
--- a/arch/arm/include/asm/arch-mx6/crm_regs.h
+++ b/arch/arm/include/asm/arch-mx6/crm_regs.h
@@ -1227,4 +1227,16 @@ struct mxc_ccm_reg {
 
 #define BM_ANADIG_ANA_MISC0_REFTOP_SELBIASOFF 0x00000008
 
+#define BM_PMU_MISC2_AUDIO_DIV_MSB (1 << 23)
+#define BP_PMU_MISC2_AUDIO_DIV_MSB 23
+
+#define BM_PMU_MISC2_AUDIO_DIV_LSB (1 << 15)
+#define BP_PMU_MISC2_AUDIO_DIV_LSB 15
+
+#define PMU_MISC2_AUDIO_DIV(v) \
+	(((v & BM_PMU_MISC2_AUDIO_DIV_MSB) >> \
+	(BP_PMU_MISC2_AUDIO_DIV_MSB - 1)) | \
+	((v & BM_PMU_MISC2_AUDIO_DIV_LSB) >> \
+	 BP_PMU_MISC2_AUDIO_DIV_LSB))
+
 #endif /*__ARCH_ARM_MACH_MX6_CCM_REGS_H__ */
-- 
2.6.2