armv8/fsl-lsch3: consolidate the clock system initialization

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

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

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;
@@ -142,13 +141,13 @@ int get_clocks(void)
 	struct sys_info sys_info;
 	get_sys_info(&sys_info);
 	gd->cpu_clk = sys_info.freq_processor[0];
-	gd->bus_clk = sys_info.freq_systembus;
+	gd->bus_clk = sys_info.freq_systembus / CONFIG_SYS_FSL_PCLK_DIV;
 	gd->mem_clk = sys_info.freq_ddrbus;
 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
 	gd->arch.mem2_clk = sys_info.freq_ddrbus2;
 #endif
 #if defined(CONFIG_FSL_ESDHC)
-	gd->arch.sdhc_clk = gd->bus_clk / 2;
+	gd->arch.sdhc_clk = gd->bus_clk / CONFIG_SYS_FSL_SDHC_CLK_DIV;
 #endif /* defined(CONFIG_FSL_ESDHC) */
 
 	if (gd->cpu_clk != 0)
@@ -159,7 +158,7 @@ int get_clocks(void)
 
 /********************************************
  * get_bus_freq
- * return system bus freq in Hz
+ * return platform clock 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) / CONFIG_SYS_FSL_I2C_CLK_DIV;
+}
+
+int get_dspi_freq(ulong dummy)
+{
+	return get_bus_freq(0) / CONFIG_SYS_FSL_DSPI_CLK_DIV;
+}
+
+int get_serial_clock(void)
+{
+	return get_bus_freq(0) / CONFIG_SYS_FSL_DUART_CLK_DIV;
+}
+
 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");
 	}

arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h

@@ -151,6 +151,7 @@
 #ifndef __ASSEMBLY__
 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

include/configs/ls2080a_common.h

@@ -97,7 +97,7 @@
 #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 }