[U-Boot] [PATCH 2/2] armv8/fsl-lsch3: consolidate the clock system initialization

[Zhiqiang Hou]

From: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>

This patch map the sys_info->freq_systembus to Platform PLL, and
implement the IPs' clock function individually.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
---
 .../arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c | 26 +++++++++++++++++-----
 .../include/asm/arch-fsl-layerscape/immap_lsch3.h  |  1 +
 include/configs/ls2080a_common.h                   |  2 +-
 3 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c b/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c
index a9b12a4..daad80a 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c
@@ -88,11 +88,10 @@ void get_sys_info(struct sys_info *sys_info)
 #endif
 #endif
 
+	/* The freq_systembus is used to record frequency of platform PLL */
 	sys_info->freq_systembus *= (gur_in32(&gur->rcwsr[0]) >>
 			FSL_CHASSIS3_RCWSR0_SYS_PLL_RAT_SHIFT) &
 			FSL_CHASSIS3_RCWSR0_SYS_PLL_RAT_MASK;
-	/* Platform clock is half of platform PLL */
-	sys_info->freq_systembus /= 2;
 	sys_info->freq_ddrbus *= (gur_in32(&gur->rcwsr[0]) >>
 			FSL_CHASSIS3_RCWSR0_MEM_PLL_RAT_SHIFT) &
 			FSL_CHASSIS3_RCWSR0_MEM_PLL_RAT_MASK;
@@ -132,7 +131,7 @@ void get_sys_info(struct sys_info *sys_info)
 	ccr = ifc_in32(&ifc_regs.gregs->ifc_ccr);
 	ccr = ((ccr & IFC_CCR_CLK_DIV_MASK) >> IFC_CCR_CLK_DIV_SHIFT) + 1;
 
-	sys_info->freq_localbus = sys_info->freq_systembus / ccr;
+	sys_info->freq_localbus = sys_info->freq_systembus / 2 / ccr;
 #endif
 }
 
@@ -159,7 +158,7 @@ int get_clocks(void)
 
 /********************************************
  * get_bus_freq
- * return system bus freq in Hz
+ * return platform PLL freq in Hz
  *********************************************/
 ulong get_bus_freq(ulong dummy)
 {
@@ -190,13 +189,28 @@ ulong get_ddr_freq(ulong ctrl_num)
 	return gd->mem_clk;
 }
 
+int get_i2c_freq(ulong dummy)
+{
+	return  get_bus_freq(0) / 4;
+}
+
+int get_dspi_freq(ulong dummy)
+{
+	return  get_bus_freq(0) / 4;
+}
+
+int get_serial_clock(void)
+{
+	return get_bus_freq(0) / 4;
+}
+
 unsigned int mxc_get_clock(enum mxc_clock clk)
 {
 	switch (clk) {
 	case MXC_I2C_CLK:
-		return get_bus_freq(0) / 2;
+		return get_i2c_freq(0);
 	case MXC_DSPI_CLK:
-		return get_bus_freq(0) / 2;
+		return get_dspi_freq(0);
 	default:
 		printf("Unsupported clock\n");
 	}
diff --git a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
index 93e26c1..5415165 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
@@ -165,6 +165,7 @@
 
 struct sys_info {
 	unsigned long freq_processor[CONFIG_MAX_CPUS];
+	/* frequency of platform PLL */
 	unsigned long freq_systembus;
 	unsigned long freq_ddrbus;
 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
diff --git a/include/configs/ls2080a_common.h b/include/configs/ls2080a_common.h
index ebe1415..8cfb7fb 100644
--- a/include/configs/ls2080a_common.h
+++ b/include/configs/ls2080a_common.h
@@ -102,7 +102,7 @@
 #define CONFIG_CONS_INDEX       1
 #define CONFIG_SYS_NS16550_SERIAL
 #define CONFIG_SYS_NS16550_REG_SIZE     1
-#define CONFIG_SYS_NS16550_CLK          (get_bus_freq(0)/2)
+#define CONFIG_SYS_NS16550_CLK          (get_serial_clock())
 
 #define CONFIG_BAUDRATE			115200
 #define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200 }
-- 
2.1.0.27.g96db324