i.MX28: Add battery boot components to SPL

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>

arch/arm/cpu/arm926ejs/mx28/spl_power_init.c

@@ -45,11 +45,11 @@ void mx28_power_clock2pll(void)
 	struct mx28_clkctrl_regs *clkctrl_regs =
 		(struct mx28_clkctrl_regs *)MXS_CLKCTRL_BASE;
 
-	writel(CLKCTRL_PLL0CTRL0_POWER,
-		&clkctrl_regs->hw_clkctrl_pll0ctrl0_set);
+	setbits_le32(&clkctrl_regs->hw_clkctrl_pll0ctrl0,
+			CLKCTRL_PLL0CTRL0_POWER);
 	early_delay(100);
-	writel(CLKCTRL_CLKSEQ_BYPASS_CPU,
-		&clkctrl_regs->hw_clkctrl_clkseq_clr);
+	setbits_le32(&clkctrl_regs->hw_clkctrl_clkseq,
+			CLKCTRL_CLKSEQ_BYPASS_CPU);
 }
 
 void mx28_power_clear_auto_restart(void)
@@ -455,9 +455,14 @@ void mx28_power_enable_4p2(void)
 	mx28_power_init_4p2_regulator();
 
 	/* Shutdown battery (none present) */
-	clrbits_le32(&power_regs->hw_power_dcdc4p2, POWER_DCDC4P2_BO_MASK);
-	writel(POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
-	writel(POWER_CTRL_ENIRQ_DCDC4P2_BO, &power_regs->hw_power_ctrl_clr);
+	if (!mx28_is_batt_ready()) {
+		clrbits_le32(&power_regs->hw_power_dcdc4p2,
+				POWER_DCDC4P2_BO_MASK);
+		writel(POWER_CTRL_DCDC4P2_BO_IRQ,
+				&power_regs->hw_power_ctrl_clr);
+		writel(POWER_CTRL_ENIRQ_DCDC4P2_BO,
+				&power_regs->hw_power_ctrl_clr);
+	}
 
 	mx28_power_init_dcdc_4p2_source();
 
@@ -515,6 +520,50 @@ void mx28_powerdown(void)
 		&power_regs->hw_power_reset);
 }
 
+void mx28_batt_boot(void)
+{
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+
+	clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_PWDN_5VBRNOUT);
+	clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_ENABLE_DCDC);
+
+	clrbits_le32(&power_regs->hw_power_dcdc4p2,
+			POWER_DCDC4P2_ENABLE_DCDC | POWER_DCDC4P2_ENABLE_4P2);
+	writel(POWER_CHARGE_ENABLE_LOAD, &power_regs->hw_power_charge_clr);
+
+	/* 5V to battery handoff. */
+	setbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
+	early_delay(30);
+	clrbits_le32(&power_regs->hw_power_5vctrl, POWER_5VCTRL_DCDC_XFER);
+
+	writel(POWER_CTRL_ENIRQ_DCDC4P2_BO, &power_regs->hw_power_ctrl_clr);
+
+	clrsetbits_le32(&power_regs->hw_power_minpwr,
+			POWER_MINPWR_HALFFETS, POWER_MINPWR_DOUBLE_FETS);
+
+	mx28_power_set_linreg();
+
+	clrbits_le32(&power_regs->hw_power_vdddctrl,
+		POWER_VDDDCTRL_DISABLE_FET | POWER_VDDDCTRL_ENABLE_LINREG);
+
+	clrbits_le32(&power_regs->hw_power_vddactrl,
+		POWER_VDDACTRL_DISABLE_FET | POWER_VDDACTRL_ENABLE_LINREG);
+
+	clrbits_le32(&power_regs->hw_power_vddioctrl,
+		POWER_VDDIOCTRL_DISABLE_FET);
+
+	setbits_le32(&power_regs->hw_power_5vctrl,
+		POWER_5VCTRL_PWD_CHARGE_4P2_MASK);
+
+	setbits_le32(&power_regs->hw_power_5vctrl,
+		POWER_5VCTRL_ENABLE_DCDC);
+
+	clrsetbits_le32(&power_regs->hw_power_5vctrl,
+		POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
+		0x8 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
+}
+
 void mx28_handle_5v_conflict(void)
 {
 	struct mx28_power_regs *power_regs =
@@ -539,6 +588,11 @@ void mx28_handle_5v_conflict(void)
 			mx28_powerdown();
 			break;
 		}
+
+		if (tmp & POWER_STS_PSWITCH_MASK) {
+			mx28_batt_boot();
+			break;
+		}
 	}
 }
 
@@ -595,12 +649,42 @@ void mx28_switch_vddd_to_dcdc_source(void)
 
 void mx28_power_configure_power_source(void)
 {
+	int batt_ready, batt_good;
+	struct mx28_power_regs *power_regs =
+		(struct mx28_power_regs *)MXS_POWER_BASE;
+	struct mx28_lradc_regs *lradc_regs =
+		(struct mx28_lradc_regs *)MXS_LRADC_BASE;
+
 	mx28_src_power_init();
 
-	mx28_5v_boot();
+	batt_ready = mx28_is_batt_ready();
+
+	if (readl(&power_regs->hw_power_sts) & POWER_STS_VDD5V_GT_VDDIO) {
+		batt_good = mx28_is_batt_good();
+		if (batt_ready) {
+			/* 5V source detected, good battery detected. */
+			mx28_batt_boot();
+		} else {
+			if (batt_good) {
+				/* 5V source detected, low battery detceted. */
+			} else {
+				/* 5V source detected, bad battery detected. */
+				writel(LRADC_CONVERSION_AUTOMATIC,
+					&lradc_regs->hw_lradc_conversion_clr);
+				clrbits_le32(&power_regs->hw_power_battmonitor,
+					POWER_BATTMONITOR_BATT_VAL_MASK);
+			}
+			mx28_5v_boot();
+		}
+	} else {
+		/* 5V not detected, booting from battery. */
+		mx28_batt_boot();
+	}
+
 	mx28_power_clock2pll();
 
 	mx28_init_batt_bo();
+
 	mx28_switch_vddd_to_dcdc_source();
 }