charger: isl923x: Add support for ISL9238

ISL9237 and ISL9238 are almost identical, with few register changes,
let's make the driver generic, to support both chargers.

BRANCH=none
BUG=chrome-os-partner:61166
TEST=make buildall -j

Change-Id: I029894dd62ab7e45897d877289707ee8c1ff1d09
Reviewed-on: https://chromium-review.googlesource.com/422197
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

1 files changed, 264 insertions, 0 deletions

diff --git a/driver/charger/isl923x.h b/driver/charger/isl923x.h
new file mode 100644
index 0000000000..ba018e766c
--- /dev/null
+++ b/driver/charger/isl923x.h
@@ -0,0 +1,264 @@
+/* Copyright 2015 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Intersil ISL-9237/8 battery charger driver.
+ */
+
+#ifndef __CROS_EC_ISL923X_H
+#define __CROS_EC_ISL923X_H
+
+#define ISL923X_ADDR 0x12 /* 7bit address 0001001 */
+
+/* Registers */
+#define ISL923X_REG_CHG_CURRENT      0x14
+#define ISL923X_REG_ADAPTER_CURRENT1 0x3f
+#define ISL923X_REG_ADAPTER_CURRENT2 0x3b
+#define ISL923X_REG_SYS_VOLTAGE_MAX  0x15
+#define ISL923X_REG_SYS_VOLTAGE_MIN  0x3e
+#define ISL923X_REG_PROCHOT_AC       0x47
+#define ISL923X_REG_PROCHOT_DC       0x48
+#define ISL923X_REG_T1_T2            0x38
+#define ISL923X_REG_CONTROL0         0x39
+#define ISL923X_REG_CONTROL1         0x3c
+#define ISL923X_REG_CONTROL2         0x3d
+#define ISL9238_REG_CONTROL3         0x4c
+#define ISL9238_REG_CONTROL4         0x4e
+#define ISL923X_REG_INFO             0x3a
+#define ISL9238_REG_INFO2            0x4d
+#define ISL923X_REG_OTG_VOLTAGE      0x49
+#define ISL923X_REG_OTG_CURRENT      0x4a
+#define ISL9238_REG_INPUT_VOLTAGE    0x4b
+#define ISL923X_REG_MANUFACTURER_ID  0xfe
+#define ISL923X_REG_DEVICE_ID        0xff
+
+/* Sense resistor default values in mOhm */
+#define ISL923X_DEFAULT_SENSE_RESISTOR_AC 20
+#define ISL923X_DEFAULT_SENSE_RESISTOR 10
+
+/* Maximum charging current register value */
+#define ISL923X_CURRENT_REG_MAX 0x17c0 /* bit<12:2> 10111110000 */
+
+/* 2-level adpater current limit duration T1 & T2 in micro seconds */
+#define ISL923X_T1_10000 0x00
+#define ISL923X_T1_20000 0x01
+#define ISL923X_T1_15000 0x02
+#define ISL923X_T1_5000  0x03
+#define ISL923X_T1_1000  0x04
+#define ISL923X_T1_500   0x05
+#define ISL923X_T1_100   0x06
+#define ISL923X_T1_0     0x07
+#define ISL923X_T2_10    (0x00 << 8)
+#define ISL923X_T2_100   (0x01 << 8)
+#define ISL923X_T2_500   (0x02 << 8)
+#define ISL923X_T2_1000  (0x03 << 8)
+#define ISL923X_T2_300   (0x04 << 8)
+#define ISL923X_T2_750   (0x05 << 8)
+#define ISL923X_T2_2000  (0x06 << 8)
+#define ISL923X_T2_10000 (0x07 << 8)
+
+#define ISL9237_SYS_VOLTAGE_REG_MAX 13824
+#define ISL9238_SYS_VOLTAGE_REG_MAX 18304
+#define ISL923X_SYS_VOLTAGE_REG_MIN 2048
+
+/* PROCHOT# debounce time and duration time in micro seconds */
+#define ISL923X_PROCHOT_DURATION_10000  (0 << 6)
+#define ISL923X_PROCHOT_DURATION_20000  (1 << 6)
+#define ISL923X_PROCHOT_DURATION_15000  (2 << 6)
+#define ISL923X_PROCHOT_DURATION_5000   (3 << 6)
+#define ISL923X_PROCHOT_DURATION_1000   (4 << 6)
+#define ISL923X_PROCHOT_DURATION_500    (5 << 6)
+#define ISL923X_PROCHOT_DURATION_100000 (6 << 6)
+#define ISL923X_PROCHOT_DURATION_0      (7 << 6)
+#define ISL923X_PROCHOT_DURATION_MASK   (7 << 6)
+
+#define ISL923X_PROCHOT_DEBOUNCE_10   (0 << 9)
+#define ISL923X_PROCHOT_DEBOUNCE_100  (1 << 9)
+#define ISL923X_PROCHOT_DEBOUNCE_500  (2 << 9)
+#define ISL923X_PROCHOT_DEBOUNCE_1000 (3 << 9)
+#define ISL923X_PROCHOT_DEBOUNCE_MASK (3 << 9)
+
+/* Maximum PROCHOT register value */
+#define ISL923X_PROCHOT_AC_REG_MAX 6400
+#define ISL923X_PROCHOT_DC_REG_MAX 12800
+
+/* Control0: adapter voltage regulation reference */
+#define ISL9237_C0_VREG_REF_3900 0
+#define ISL9237_C0_VREG_REF_4200 1
+#define ISL9237_C0_VREG_REF_4500 2
+#define ISL9237_C0_VREG_REF_4800 3
+#define ISL9237_C0_VREG_REF_MASK 0x03
+
+/* Control0: disable adapter voltaqe regulation */
+#define ISL923X_C0_DISABLE_VREG (1 << 2)
+
+/* Control0: battery DCHOT reference for RS2 == 20mOhm */
+#define ISL923X_C0_DCHOT_6A   (0 << 3)
+#define ISL923X_C0_DCHOT_5A   (1 << 3)
+#define ISL923X_C0_DCHOT_4A   (2 << 3)
+#define ISL923X_C0_DCHOT_3A   (3 << 3)
+#define ISL923X_C0_DCHOT_MASK (3 << 3)
+
+/* Control1: general purpose comparator debounce time in micro second */
+#define ISL923X_C1_GP_DEBOUNCE_2       (0 << 14)
+#define ISL923X_C1_GP_DEBOUNCE_12      (1 << 14)
+#define ISL923X_C1_GP_DEBOUNCE_2000    (2 << 14)
+#define ISL923X_C1_GP_DEBOUNCE_5000000 (3 << 14)
+#define ISL923X_C1_GP_DEBOUNCE_MASK    (3 << 14)
+
+/* Control1: learn mode */
+#define ISL923X_C1_LEARN_MODE_AUTOEXIT (1 << 13)
+#define ISL923X_C1_LEARN_MODE_ENABLE   (1 << 12)
+
+/* Control1: OTG enable */
+#define ISL923X_C1_OTG (1 << 11)
+
+/* Control1: audio filter */
+#define ISL923X_C1_AUDIO_FILTER (1 << 10)
+
+/* Control1: switch frequency, ISL9238 defines bit 7 as unused */
+#define ISL923X_C1_SWITCH_FREQ_PROG (0 << 7) /* 1000kHz or PROG */
+#define ISL9237_C1_SWITCH_FREQ_913K (1 << 7)
+#define ISL923X_C1_SWITCH_FREQ_839K (2 << 7)
+#define ISL9237_C1_SWITCH_FREQ_777K (3 << 7)
+#define ISL923X_C1_SWITCH_FREQ_723K (4 << 7)
+#define ISL9237_C1_SWITCH_FREQ_676K (5 << 7)
+#define ISL923X_C1_SWITCH_FREQ_635K (6 << 7)
+#define ISL9237_C1_SWITCH_FREQ_599K (7 << 7)
+#define ISL923X_C1_SWITCH_FREQ_MASK (7 << 7)
+
+/* Control1: turbo mode */
+#define ISL923X_C1_TURBO_MODE (1 << 6)
+
+/* Control1: AMON & BMON */
+#define ISL923X_C1_DISABLE_MON (1 << 5)
+#define ISL923X_C1_SELECT_BMON (1 << 4)
+
+/* Control1: PSYS, VSYS, VSYSLO */
+#define ISL923X_C1_ENABLE_PSYS (1 << 3)
+#define ISL923X_C1_ENABLE_VSYS (1 << 2)
+#define ISL923X_C1_VSYSLO_REF_6000 0
+#define ISL923X_C1_VSYSLO_REF_6300 1
+#define ISL923X_C1_VSYSLO_REF_6600 2
+#define ISL923X_C1_VSYSLO_REF_6900 3
+#define ISL923X_C1_VSYSLO_REF_MASK 3
+
+/* Control2: trickle charging current in mA */
+#define ISL923X_C2_TRICKLE_256  (0 << 14)
+#define ISL923X_C2_TRICKLE_128  (1 << 14)
+#define ISL923X_C2_TRICKLE_64   (2 << 14)
+#define ISL923X_C2_TRICKLE_512  (3 << 14)
+#define ISL923X_C2_TRICKLE_MASK (3 << 14)
+
+/* Control2: OTGEN debounce time in ms */
+#define ISL923X_C2_OTG_DEBOUNCE_1300 (0 << 13)
+#define ISL923X_C2_OTG_DEBOUNCE_150  (1 << 13)
+#define ISL923X_C2_OTG_DEBOUNCE_MASK (1 << 13)
+
+/* Control2: 2-level adapter over current */
+#define ISL923X_C2_2LVL_OVERCURRENT (1 << 12)
+
+/* Control2: adapter insertion debounce time in ms */
+#define ISL923X_C2_ADAPTER_DEBOUNCE_1300 (0 << 11)
+#define ISL923X_C2_ADAPTER_DEBOUNCE_150  (1 << 11)
+#define ISL923X_C2_ADAPTER_DEBOUNCE_MASK (1 << 11)
+
+/* Control2: PROCHOT debounce time in uS */
+#define ISL9238_C2_PROCHOT_DEBOUNCE_7    (0 << 9)
+#define ISL9237_C2_PROCHOT_DEBOUNCE_10   (0 << 9)
+#define ISL923X_C2_PROCHOT_DEBOUNCE_100  (1 << 9)
+#define ISL923X_C2_PROCHOT_DEBOUNCE_500  (2 << 9)
+#define ISL923X_C2_PROCHOT_DEBOUNCE_1000 (3 << 9)
+#define ISL923X_C2_PROCHOT_DEBOUNCE_MASK (3 << 9)
+
+/* Control2: min PROCHOT duration in uS */
+#define ISL923X_C2_PROCHOT_DURATION_10000 (0 << 6)
+#define ISL923X_C2_PROCHOT_DURATION_20000 (1 << 6)
+#define ISL923X_C2_PROCHOT_DURATION_15000 (2 << 6)
+#define ISL923X_C2_PROCHOT_DURATION_5000  (3 << 6)
+#define ISL923X_C2_PROCHOT_DURATION_1000  (4 << 6)
+#define ISL923X_C2_PROCHOT_DURATION_500   (5 << 6)
+#define ISL923X_C2_PROCHOT_DURATION_100   (6 << 6)
+#define ISL923X_C2_PROCHOT_DURATION_0     (7 << 6)
+#define ISL923X_C2_PROCHOT_DURATION_MASK  (7 << 6)
+
+/* Control2: turn off ASGATE in OTG mode */
+#define ISL923X_C2_ASGATE_OFF (1 << 5)
+
+/* Control2: CMIN, general purpose comparator reference in mV */
+#define ISL923X_C2_CMIN_2000 (0 << 4)
+#define ISL923X_C2_CMIN_1200 (1 << 4)
+
+/* Control2: general purpose comparator enable */
+#define ISL923X_C2_COMPARATOR (1 << 3)
+
+/* Control2: invert CMOUT, general purpose comparator output, polarity */
+#define ISL923X_C2_INVERT_CMOUT (1 << 2)
+
+/* Control2: disable WOC, way over current */
+#define ISL923X_C2_WOC_OFF (1 << 1)
+
+/* Control2: PSYS gain in uA/W (ISL9237 only) */
+#define ISL9237_C2_PSYS_GAIN (1 << 0)
+
+/* Control2: PSYS gain in uA/W (ISL9238 only) */
+#define ISL9238_C3_PSYS_GAIN (1 << 9)
+
+/* OTG voltage limit in mV, current limit in mA */
+#define ISL923X_OTG_VOLTAGE_MIN 4864
+#define ISL923X_OTG_VOLTAGE_MAX 5376
+#define ISL923X_OTG_CURRENT_MAX 4096
+
+/* Info register fields */
+#define ISL9237_INFO_PROG_RESISTOR_MASK 0xf
+#define ISL923X_INFO_TRICKLE_ACTIVE_MASK (1 << 4)
+#define ISL9237_INFO_PSTATE_SHIFT 5
+#define ISL9237_INFO_PSTATE_MASK 3
+
+enum isl9237_power_stage {
+	BUCK_MODE,
+	BOOST_MODE,
+	BUCK_BOOST_MODE,
+	REVERSE_BUCK_MODE
+};
+
+#define ISL9237_INFO_FSM_STATE_SHIFT 7
+#define ISL9237_INFO_FSM_STATE_MASK 7
+
+enum isl9237_fsm_state {
+	FSM_OFF,
+	FSM_BAT,
+	FSM_ADPT,
+	FSM_ACOK,
+	FSM_VSYS,
+	FSM_CHRG,
+	FSM_ENTOG,
+	FSM_OTG
+};
+
+#define ISL923X_INFO_VSYSLO (1 << 10)
+#define ISL923X_INFO_DCHOT (1 << 11)
+#define ISL9237_INFO_ACHOT (1 << 12)
+
+#if defined(CONFIG_CHARGER_ISL9237)
+#define CHARGER_NAME  "isl9237"
+#define CHARGE_V_MAX  ISL9237_SYS_VOLTAGE_REG_MAX
+#define CHARGE_V_MIN  ISL923X_SYS_VOLTAGE_REG_MIN
+#define CHARGE_V_STEP 8
+#elif defined(CONFIG_CHARGER_ISL9238)
+#define CHARGER_NAME  "isl9238"
+#define CHARGE_V_MAX  ISL9238_SYS_VOLTAGE_REG_MAX
+#define CHARGE_V_MIN  ISL923X_SYS_VOLTAGE_REG_MIN
+#define CHARGE_V_STEP 8
+#endif
+
+#define CHARGE_I_MAX  ISL923X_CURRENT_REG_MAX
+#define CHARGE_I_MIN  4
+#define CHARGE_I_OFF  0
+#define CHARGE_I_STEP 4
+#define INPUT_I_MAX   ISL923X_CURRENT_REG_MAX
+#define INPUT_I_MIN   4
+#define INPUT_I_STEP  4
+
+#define I2C_ADDR_CHARGER ISL923X_ADDR
+#endif /* __CROS_EC_ISL923X_H */