[U-Boot] [PATCH v4 6/7] board: common: vid: Add support for LTC3882 voltage regulator chip
Rajesh Bhagat
rajesh.bhagat at nxp.com
Tue Nov 7 10:38:04 UTC 2017
Restructures common driver to support LTC3882 voltage regulator
chip.
Signed-off-by: Ashish Kumar <Ashish.Kumar at nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat at nxp.com>
---
Changes in v4:
None
Changes in v3:
Restructured LS1088A VID support to use common VID driver
Added the coding for voltage in comments i.e. 1/4096V
Removed APIs getLSB/MSB and used bit operations.
Changes in v2:
Checkpatch errors fixed
.../include/asm/arch-fsl-layerscape/immap_lsch3.h | 9 ++-
board/freescale/common/vid.c | 76 ++++++++++++++++++++++
include/configs/ls1088aqds.h | 16 +++++
include/configs/ls1088ardb.h | 15 +++++
4 files changed, 114 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
index 47e8b5a..642df2f 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
@@ -201,10 +201,15 @@ struct ccsr_gur {
u32 gpporcr3;
u32 gpporcr4;
u8 res_030[0x60-0x30];
-#define FSL_CHASSIS3_DCFG_FUSESR_VID_SHIFT 2
#define FSL_CHASSIS3_DCFG_FUSESR_VID_MASK 0x1F
-#define FSL_CHASSIS3_DCFG_FUSESR_ALTVID_SHIFT 7
#define FSL_CHASSIS3_DCFG_FUSESR_ALTVID_MASK 0x1F
+#if defined(CONFIG_ARCH_LS1088A)
+#define FSL_CHASSIS3_DCFG_FUSESR_VID_SHIFT 25
+#define FSL_CHASSIS3_DCFG_FUSESR_ALTVID_SHIFT 20
+#else
+#define FSL_CHASSIS3_DCFG_FUSESR_VID_SHIFT 2
+#define FSL_CHASSIS3_DCFG_FUSESR_ALTVID_SHIFT 7
+#endif
u32 dcfg_fusesr; /* Fuse status register */
u8 res_064[0x70-0x64];
u32 devdisr; /* Device disable control 1 */
diff --git a/board/freescale/common/vid.c b/board/freescale/common/vid.c
index 8acadc4..871f92a 100644
--- a/board/freescale/common/vid.c
+++ b/board/freescale/common/vid.c
@@ -174,6 +174,36 @@ static int read_voltage_from_IR(int i2caddress)
}
#endif
+#ifdef CONFIG_VOL_MONITOR_LTC3882_READ
+/* read the current value of the LTC Regulator Voltage */
+static int read_voltage_from_LTC(int i2caddress)
+{
+ int ret, vcode = 0;
+ u8 chan = PWM_CHANNEL0;
+
+ /* select the PAGE 0 using PMBus commands PAGE for VDD*/
+ ret = i2c_write(I2C_VOL_MONITOR_ADDR,
+ PMBUS_CMD_PAGE, 1, &chan, 1);
+ if (ret) {
+ printf("VID: failed to select VDD Page 0\n");
+ return ret;
+ }
+
+ /*read the output voltage using PMBus command READ_VOUT*/
+ ret = i2c_read(I2C_VOL_MONITOR_ADDR,
+ PMBUS_CMD_READ_VOUT, 1, (void *)&vcode, 2);
+ if (ret) {
+ printf("VID: failed to read the volatge\n");
+ return ret;
+ }
+
+ /* Scale down to the real mV as LTC resolution is 1/4096V,rounding up */
+ vcode = DIV_ROUND_UP(vcode * 1000, 4096);
+
+ return vcode;
+}
+#endif
+
static int read_voltage(int i2caddress)
{
int voltage_read;
@@ -181,6 +211,8 @@ static int read_voltage(int i2caddress)
voltage_read = read_voltage_from_INA220(i2caddress);
#elif defined CONFIG_VOL_MONITOR_IR36021_READ
voltage_read = read_voltage_from_IR(i2caddress);
+#elif defined CONFIG_VOL_MONITOR_LTC3882_READ
+ voltage_read = read_voltage_from_LTC(i2caddress);
#else
return -1;
#endif
@@ -281,6 +313,42 @@ static int set_voltage_to_IR(int i2caddress, int vdd)
debug("VID: Current voltage is %d mV\n", vdd_last);
return vdd_last;
}
+
+#endif
+
+#ifdef CONFIG_VOL_MONITOR_LTC3882_SET
+/* this function sets the VDD and returns the value set */
+static int set_voltage_to_LTC(int i2caddress, int vdd)
+{
+ int ret, vdd_last, vdd_target = vdd;
+
+ /* Scale up to the LTC resolution is 1/4096V */
+ vdd = (vdd * 4096) / 1000;
+
+ /* 5-byte buffer which needs to be sent following the
+ * PMBus command PAGE_PLUS_WRITE.
+ */
+ u8 buff[5] = {0x04, PWM_CHANNEL0, PMBUS_CMD_VOUT_COMMAND,
+ vdd & 0xFF, (vdd & 0xFF00) >> 8};
+
+ /* Write the desired voltage code to the regulator */
+ ret = i2c_write(I2C_VOL_MONITOR_ADDR,
+ PMBUS_CMD_PAGE_PLUS_WRITE, 1, (void *)&buff, 5);
+ if (ret) {
+ printf("VID: I2C failed to write to the volatge regulator\n");
+ return -1;
+ }
+
+ /* Wait for the volatge to get to the desired value */
+ do {
+ vdd_last = read_voltage_from_LTC(i2caddress);
+ if (vdd_last < 0) {
+ printf("VID: Couldn't read sensor abort VID adjust\n");
+ return -1;
+ }
+ } while (vdd_last != vdd_target);
+ return vdd_last;
+}
#endif
static int set_voltage(int i2caddress, int vdd)
@@ -289,6 +357,8 @@ static int set_voltage(int i2caddress, int vdd)
#ifdef CONFIG_VOL_MONITOR_IR36021_SET
vdd_last = set_voltage_to_IR(i2caddress, vdd);
+#elif defined CONFIG_VOL_MONITOR_LTC3882_SET
+ vdd_last = set_voltage_to_LTC(i2caddress, vdd);
#else
#error Specific voltage monitor must be defined
#endif
@@ -455,6 +525,11 @@ int adjust_vdd(ulong vdd_override)
}
vdd_current = vdd_last;
debug("VID: Core voltage is currently at %d mV\n", vdd_last);
+
+#ifdef CONFIG_VOL_MONITOR_LTC3882_SET
+ /* Set the target voltage */
+ vdd_last = vdd_current = set_voltage(i2caddress, vdd_target);
+#else
/*
* Adjust voltage to at or one step above target.
* As measurements are less precise than setting the values
@@ -472,6 +547,7 @@ int adjust_vdd(ulong vdd_override)
vdd_last = set_voltage(i2caddress, vdd_current);
}
+#endif
if (board_adjust_vdd(vdd_target) < 0) {
ret = -1;
goto exit;
diff --git a/include/configs/ls1088aqds.h b/include/configs/ls1088aqds.h
index 310e8fd..76570f2 100644
--- a/include/configs/ls1088aqds.h
+++ b/include/configs/ls1088aqds.h
@@ -280,6 +280,22 @@ unsigned long get_board_ddr_clk(void);
#define I2C_MUX_CH_DEFAULT 0x8
#define I2C_MUX_CH5 0xD
+#define I2C_MUX_CH_VOL_MONITOR 0xA
+
+/* Voltage monitor on channel 2*/
+#define I2C_VOL_MONITOR_ADDR 0x63
+#define I2C_VOL_MONITOR_BUS_V_OFFSET 0x2
+#define I2C_VOL_MONITOR_BUS_V_OVF 0x1
+#define I2C_VOL_MONITOR_BUS_V_SHIFT 3
+
+/* PM Bus commands code for LTC3882*/
+#define PMBUS_CMD_PAGE 0x0
+#define PMBUS_CMD_READ_VOUT 0x8B
+#define PMBUS_CMD_PAGE_PLUS_WRITE 0x05
+#define PMBUS_CMD_VOUT_COMMAND 0x21
+
+#define PWM_CHANNEL0 0x0
+
/*
* RTC configuration
*/
diff --git a/include/configs/ls1088ardb.h b/include/configs/ls1088ardb.h
index c7d1fd3..feffd33 100644
--- a/include/configs/ls1088ardb.h
+++ b/include/configs/ls1088ardb.h
@@ -211,6 +211,21 @@
#define CONFIG_SYS_LS_MC_BOOT_TIMEOUT_MS 5000
+#define I2C_MUX_CH_VOL_MONITOR 0xA
+/* Voltage monitor on channel 2*/
+#define I2C_VOL_MONITOR_ADDR 0x63
+#define I2C_VOL_MONITOR_BUS_V_OFFSET 0x2
+#define I2C_VOL_MONITOR_BUS_V_OVF 0x1
+#define I2C_VOL_MONITOR_BUS_V_SHIFT 3
+
+/* PM Bus commands code for LTC3882*/
+#define PMBUS_CMD_PAGE 0x0
+#define PMBUS_CMD_READ_VOUT 0x8B
+#define PMBUS_CMD_PAGE_PLUS_WRITE 0x05
+#define PMBUS_CMD_VOUT_COMMAND 0x21
+
+#define PWM_CHANNEL0 0x0
+
/*
* I2C bus multiplexer
*/
--
2.7.4
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