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From 2e5adad8385127605c3ad3e3a006d65deeccde38 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marek.vasut@gmail.com>
Date: Tue, 1 May 2012 11:09:51 +0000
Subject: [PATCH 53/56] 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 |  100 +++++++++++++++++++++++---
 1 file changed, 92 insertions(+), 8 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c b/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c
index ac942b4..4b09b0c 100644
--- a/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c
+++ b/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();
 }
 
-- 
1.7.10