GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2010-2011 Freescale Semiconductor, Inc.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#include "ics307_clk.h"
+
+#if defined(CONFIG_FSL_NGPIXIS)
+#include "ngpixis.h"
+#define fpga_reg pixis
+#elif defined(CONFIG_FSL_QIXIS)
+#include "qixis.h"
+#define fpga_reg ((struct qixis *)QIXIS_BASE)
+#else
+#include "pixis.h"
+#define fpga_reg pixis
+#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.
+ */
+static unsigned long ics307_clk_freq(u8 cw0, u8 cw1, u8 cw2)
+{
+	const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ;
+	unsigned long vdw = ((cw1 << 1) & 0x1FE) + ((cw2 >> 7) & 1);
+	unsigned long rdw = cw2 & 0x7F;
+	unsigned long od = ics307_s_to_od[cw0 & 0x7];
+	unsigned long freq;
+
+	/*
+	 * CLK1 Freq = Input Frequency * 2 * (VDW + 8) / ((RDW + 2) * OD)
+	 *
+	 * cw0:  C1 C0 TTL F1 F0 S2 S1 S0
+	 * cw1:  V8 V7 V6 V5 V4 V3 V2 V1
+	 * cw2:  V0 R6 R5 R4 R3 R2 R1 R0
+	 *
+	 * R6:R0 = Reference Divider Word (RDW)
+	 * V8:V0 = VCO Divider Word (VDW)
+	 * S2:S0 = Output Divider Select (OD)
+	 * F1:F0 = Function of CLK2 Output
+	 * TTL = duty cycle
+	 * C1:C0 = internal load capacitance for cyrstal
+	 *
+	 */
+
+	freq = input_freq * 2 * (vdw + 8) / ((rdw + 2) * od);
+
+	debug("ICS307: CW[0-2]: %02X %02X %02X => %lu Hz\n", cw0, cw1, cw2,
+			freq);
+	return freq;
+}
+
+unsigned long get_board_sys_clk(void)
+{
+	return ics307_clk_freq(
+			in_8(&fpga_reg->sclk[0]),
+			in_8(&fpga_reg->sclk[1]),
+			in_8(&fpga_reg->sclk[2]));
+}
+
+unsigned long get_board_ddr_clk(void)
+{
+	return ics307_clk_freq(
+			in_8(&fpga_reg->dclk[0]),
+			in_8(&fpga_reg->dclk[1]),
+			in_8(&fpga_reg->dclk[2]));
+}