MLK-12495 mx6: Add LDO bypass support

Port LDO bypass support from v2015 to support the features:

1. Add check for 1.2GHz core speed. If Speed grading fuse is for 1.2GHz,
   enable LDO bypass and setup PMIC voltages. LDO bypass is dependent
   on the flatten device tree file.

2. We set WDOG_B in set_anatop_bypass() before, because it is the only case, but now
   on i.mx6sabreauto board, we didn't use ldo-bypass mode, but have to use WDOG_B to
   reboot whole board, so split these code to independent function so that board file
   can call it freely.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 5b87d04dba66fa45375d59648838ef89f559f75d)

1 files changed, 191 insertions, 0 deletions

diff --git a/board/freescale/mx6sabresd/mx6sabresd.c b/board/freescale/mx6sabresd/mx6sabresd.c
index d0db0c6..c09c9d2 100644
--- a/board/freescale/mx6sabresd/mx6sabresd.c
+++ b/board/freescale/mx6sabresd/mx6sabresd.c
@@ -1076,6 +1076,197 @@ int power_init_board(void)
 }
 #endif
 
+#ifdef CONFIG_LDO_BYPASS_CHECK
+#ifdef CONFIG_POWER
+void ldo_mode_set(int ldo_bypass)
+{
+	unsigned int value;
+	int is_400M;
+	unsigned char vddarm;
+	struct pmic *p = pmic_get("PFUZE100");
+
+	if (!p) {
+		printf("No PMIC found!\n");
+		return;
+	}
+
+	/* increase VDDARM/VDDSOC to support 1.2G chip */
+	if (check_1_2G()) {
+		ldo_bypass = 0;	/* ldo_enable on 1.2G chip */
+		printf("1.2G chip, increase VDDARM_IN/VDDSOC_IN\n");
+		if (is_mx6dqp()) {
+			/* increase VDDARM to 1.425V */
+			pmic_reg_read(p, PFUZE100_SW2VOL, &value);
+			value &= ~0x3f;
+			value |= 0x29;
+			pmic_reg_write(p, PFUZE100_SW2VOL, value);
+		} else {
+			/* increase VDDARM to 1.425V */
+			pmic_reg_read(p, PFUZE100_SW1ABVOL, &value);
+			value &= ~0x3f;
+			value |= 0x2d;
+			pmic_reg_write(p, PFUZE100_SW1ABVOL, value);
+		}
+		/* increase VDDSOC to 1.425V */
+		pmic_reg_read(p, PFUZE100_SW1CVOL, &value);
+		value &= ~0x3f;
+		value |= 0x2d;
+		pmic_reg_write(p, PFUZE100_SW1CVOL, value);
+	}
+	/* switch to ldo_bypass mode , boot on 800Mhz */
+	if (ldo_bypass) {
+		prep_anatop_bypass();
+		if (is_mx6dqp()) {
+			/* decrease VDDARM for 400Mhz DQP:1.1V*/
+			pmic_reg_read(p, PFUZE100_SW2VOL, &value);
+			value &= ~0x3f;
+			value |= 0x1c;
+			pmic_reg_write(p, PFUZE100_SW2VOL, value);
+		} else {
+			/* decrease VDDARM for 400Mhz DQ:1.1V, DL:1.275V */
+			pmic_reg_read(p, PFUZE100_SW1ABVOL, &value);
+			value &= ~0x3f;
+			if (is_mx6dl())
+				value |= 0x27;
+			else
+				value |= 0x20;
+
+			pmic_reg_write(p, PFUZE100_SW1ABVOL, value);
+		}
+		/* increase VDDSOC to 1.3V */
+		pmic_reg_read(p, PFUZE100_SW1CVOL, &value);
+		value &= ~0x3f;
+		value |= 0x28;
+		pmic_reg_write(p, PFUZE100_SW1CVOL, value);
+
+		/*
+		 * MX6Q/DQP:
+		 * VDDARM:1.15V@800M; VDDSOC:1.175V@800M
+		 * VDDARM:0.975V@400M; VDDSOC:1.175V@400M
+		 * MX6DL:
+		 * VDDARM:1.175V@800M; VDDSOC:1.175V@800M
+		 * VDDARM:1.075V@400M; VDDSOC:1.175V@400M
+		 */
+		is_400M = set_anatop_bypass(2);
+		if (is_mx6dqp()) {
+			pmic_reg_read(p, PFUZE100_SW2VOL, &value);
+			value &= ~0x3f;
+			if (is_400M)
+				value |= 0x17;
+			else
+				value |= 0x1e;
+			pmic_reg_write(p, PFUZE100_SW2VOL, value);
+		}
+
+		if (is_400M) {
+			if (is_mx6dl())
+				vddarm = 0x1f;
+			else
+				vddarm = 0x1b;
+		} else {
+			if (is_mx6dl())
+				vddarm = 0x23;
+			else
+				vddarm = 0x22;
+		}
+		pmic_reg_read(p, PFUZE100_SW1ABVOL, &value);
+		value &= ~0x3f;
+		value |= vddarm;
+		pmic_reg_write(p, PFUZE100_SW1ABVOL, value);
+
+		/* decrease VDDSOC to 1.175V */
+		pmic_reg_read(p, PFUZE100_SW1CVOL, &value);
+		value &= ~0x3f;
+		value |= 0x23;
+		pmic_reg_write(p, PFUZE100_SW1CVOL, value);
+
+		finish_anatop_bypass();
+		printf("switch to ldo_bypass mode!\n");
+	}
+}
+#elif defined(CONFIG_DM_PMIC_PFUZE100)
+void ldo_mode_set(int ldo_bypass)
+{
+	int is_400M;
+	unsigned char vddarm;
+	struct udevice *dev;
+	int ret;
+
+	ret = pmic_get("pfuze100", &dev);
+	if (ret == -ENODEV) {
+		printf("No PMIC found!\n");
+		return;
+	}
+
+	/* increase VDDARM/VDDSOC to support 1.2G chip */
+	if (check_1_2G()) {
+		ldo_bypass = 0; /* ldo_enable on 1.2G chip */
+		printf("1.2G chip, increase VDDARM_IN/VDDSOC_IN\n");
+		if (is_mx6dqp()) {
+			/* increase VDDARM to 1.425V */
+			pmic_clrsetbits(dev, PFUZE100_SW2VOL, 0x3f, 0x29);
+		} else {
+			/* increase VDDARM to 1.425V */
+			pmic_clrsetbits(dev, PFUZE100_SW1ABVOL, 0x3f, 0x2d);
+		}
+		/* increase VDDSOC to 1.425V */
+		pmic_clrsetbits(dev, PFUZE100_SW1CVOL, 0x3f, 0x2d);
+	}
+	/* switch to ldo_bypass mode , boot on 800Mhz */
+	if (ldo_bypass) {
+		prep_anatop_bypass();
+		if (is_mx6dqp()) {
+			/* decrease VDDARM for 400Mhz DQP:1.1V*/
+			pmic_clrsetbits(dev, PFUZE100_SW2VOL, 0x3f, 0x1c);
+		} else {
+			/* decrease VDDARM for 400Mhz DQ:1.1V, DL:1.275V */
+			if (is_mx6dl())
+				pmic_clrsetbits(dev, PFUZE100_SW1ABVOL, 0x3f, 0x27);
+			else
+				pmic_clrsetbits(dev, PFUZE100_SW1ABVOL, 0x3f, 0x20);
+		}
+		/* increase VDDSOC to 1.3V */
+		pmic_clrsetbits(dev, PFUZE100_SW1CVOL, 0x3f, 0x28);
+
+		/*
+		 * MX6Q/DQP:
+		 * VDDARM:1.15V@800M; VDDSOC:1.175V@800M
+		 * VDDARM:0.975V@400M; VDDSOC:1.175V@400M
+		 * MX6DL:
+		 * VDDARM:1.175V@800M; VDDSOC:1.175V@800M
+		 * VDDARM:1.075V@400M; VDDSOC:1.175V@400M
+		 */
+		is_400M = set_anatop_bypass(2);
+		if (is_mx6dqp()) {
+			if (is_400M)
+				pmic_clrsetbits(dev, PFUZE100_SW2VOL, 0x3f, 0x17);
+			else
+				pmic_clrsetbits(dev, PFUZE100_SW2VOL, 0x3f, 0x1e);
+		}
+
+		if (is_400M) {
+			if (is_mx6dl())
+				vddarm = 0x1f;
+			else
+				vddarm = 0x1b;
+		} else {
+			if (is_mx6dl())
+				vddarm = 0x23;
+			else
+				vddarm = 0x22;
+		}
+		pmic_clrsetbits(dev, PFUZE100_SW1ABVOL, 0x3f, vddarm);
+
+		/* decrease VDDSOC to 1.175V */
+		pmic_clrsetbits(dev, PFUZE100_SW1CVOL, 0x3f, 0x23);
+
+		finish_anatop_bypass();
+		printf("switch to ldo_bypass mode!\n");
+	}
+}
+#endif
+#endif
+
 #ifdef CONFIG_CMD_BMODE
 static const struct boot_mode board_boot_modes[] = {
 	/* 4 bit bus width */