3 files changed, 99 insertions, 1 deletions

diff --git a/board/freescale/common/ics307_clk.c b/board/freescale/common/ics307_clk.c
index 89d8810..6acbc36 100644
--- a/board/freescale/common/ics307_clk.c
+++ b/board/freescale/common/ics307_clk.c
@@ -31,12 +31,81 @@
 #include "pixis.h"
 #endif
 
+/* define for SYS CLK or CLK1Frequency */
+#define TTL		1
+#define CLK2		0
+#define CRYSTAL		0
+#define MAX_VDW		(511 + 8)
+#define MAX_RDW		(127 + 2)
+#define MIN_VDW		(4 + 8)
+#define MIN_RDW		(1 + 2)
+#define NUM_OD_SETTING	8
+/*
+ * These defines cover the industrial temperature range part,
+ * for commercial, change below to 400000 and 55000, respectively
+ */
+#define MAX_VCO		360000
+#define MIN_VCO		60000
+
 /* decode S[0-2] to Output Divider (OD) */
 static u8 ics307_s_to_od[] = {
 	10, 2, 8, 4, 5, 7, 3, 6
 };
 
 /*
+ * Find one solution to generate required frequency for SYSCLK
+ * out_freq: KHz, required frequency to the SYSCLK
+ * the result will be retuned with component RDW, VDW, OD, TTL,
+ * CLK2 and crystal
+ */
+unsigned long ics307_sysclk_calculator(unsigned long out_freq)
+{
+	const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ;
+	unsigned long vdw, rdw, odp, s_vdw = 0, s_rdw = 0, s_odp = 0, od;
+	unsigned long tmp_out, diff, result = 0;
+	int found = 0;
+
+	for (odp = 0; odp < NUM_OD_SETTING; odp++) {
+		od = ics307_s_to_od[odp];
+		if (od * out_freq < MIN_VCO || od * out_freq > MAX_VCO)
+			continue;
+		for (rdw = MIN_RDW; rdw <= MAX_RDW; rdw++) {
+			/* Calculate the VDW */
+			vdw = out_freq * 1000 * od * rdw / (input_freq * 2);
+			if (vdw > MAX_VDW)
+				vdw = MAX_VDW;
+			if (vdw < MIN_VDW)
+				continue;
+			/* Calculate the temp out frequency */
+			tmp_out = input_freq * 2 * vdw / (rdw * od * 1000);
+			diff = MAX(out_freq, tmp_out) - MIN(out_freq, tmp_out);
+			/*
+			 * calculate the percent, the precision is 1/1000
+			 * If greater than 1/1000, continue
+			 * otherwise, we think the solution is we required
+			 */
+			if (diff * 1000 / out_freq > 1)
+				continue;
+			else {
+				s_vdw = vdw;
+				s_rdw = rdw;
+				s_odp = odp;
+				found = 1;
+				break;
+			}
+		}
+	}
+
+	if (found)
+		result = (s_rdw - 2) | (s_vdw - 8) << 7 | s_odp << 16 |
+			CLK2 << 19 | TTL << 21 | CRYSTAL << 22;
+
+	debug("ICS307-02: RDW: %ld, VDW: %ld, OD: %d\n", s_rdw - 2, s_vdw - 8,
+			ics307_s_to_od[s_odp]);
+	return result;
+}
+
+/*
  * Calculate frequency being generated by ICS307-02 clock chip based upon
  * the control bytes being programmed into it.
  */
diff --git a/board/freescale/common/ics307_clk.h b/board/freescale/common/ics307_clk.h
index db3dbc4..3757912 100644
--- a/board/freescale/common/ics307_clk.h
+++ b/board/freescale/common/ics307_clk.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 Freescale Semiconductor, Inc.
+ * Copyright 2010-2011 Freescale Semiconductor, Inc.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -23,8 +23,10 @@
 #define __ICS_CLK_H_	1
 
 #ifndef __ASSEMBLY__
+
 extern unsigned long get_board_sys_clk(void);
 extern unsigned long get_board_ddr_clk(void);
+extern unsigned long ics307_sysclk_calculator(unsigned long out_freq);
 #endif
 
 #endif	/* __ICS_CLK_H_ */
diff --git a/board/freescale/common/ngpixis.c b/board/freescale/common/ngpixis.c
index 765f035..276ae3c 100644
--- a/board/freescale/common/ngpixis.c
+++ b/board/freescale/common/ngpixis.c
@@ -156,9 +156,29 @@ static void pixis_dump_regs(void)
 }
 #endif
 
+void pixis_sysclk_set(unsigned long sysclk)
+{
+	unsigned long freq_word;
+	u8 sclk0, sclk1, sclk2;
+
+	freq_word = ics307_sysclk_calculator(sysclk);
+	sclk2 = freq_word & 0xff;
+	sclk1 = (freq_word >> 8) & 0xff;
+	sclk0 = (freq_word >> 16) & 0xff;
+
+	/* set SYSCLK enable bit */
+	PIXIS_WRITE(vcfgen0, 0x01);
+
+	/* SYSCLK to required frequency */
+	PIXIS_WRITE(sclk[0], sclk0);
+	PIXIS_WRITE(sclk[1], sclk1);
+	PIXIS_WRITE(sclk[2], sclk2);
+}
+
 int pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	unsigned int i;
+	unsigned long sysclk;
 	char *p_altbank = NULL;
 #ifdef DEBUG
 	char *p_dump = NULL;
@@ -182,6 +202,12 @@ int pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 			continue;
 		}
 #endif
+		if (strcmp(argv[i], "sysclk") == 0) {
+			sysclk = simple_strtoul(argv[i + 1], NULL, 0);
+			i += 1;
+			pixis_sysclk_set(sysclk);
+			continue;
+		}
 
 		unknown_param = argv[i];
 	}
@@ -219,4 +245,5 @@ U_BOOT_CMD(
 #ifdef DEBUG
 	"pixis_reset dump - display the PIXIS registers\n"
 #endif
+	"pixis_reset sysclk <SYSCLK_freq> - reset with SYSCLK frequency(KHz)\n"
 	);