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From:   <alexandru.tachici@analog.com>
To:     <linux-hwmon@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <devicetree@vger.kernel.org>
CC:     <robh+dt@kernel.org>, <linux@roeck-us.net>,
        Alexandru Tachici <alexandru.tachici@analog.com>
Subject: [PATCH v7 8/9] hwmon: pmbus: adm1266: program configuration
Date:   Mon, 27 Jul 2020 19:19:27 +0300
Message-ID: <20200727161928.14122-9-alexandru.tachici@analog.com>
In-Reply-To: <20200727161928.14122-1-alexandru.tachici@analog.com>
References: <20200727161928.14122-1-alexandru.tachici@analog.com>
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From: Alexandru Tachici <alexandru.tachici@analog.com>

Writing the configuration Intel hex file to the nvmem,
of an adm1266, with offset 0x30000, will now
trigger the configuration programming.

During this process the adm1266 sequencer will be
stopped and at the end will be issued a seq reset
(see AN-1453 Programming the configuration).

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
---
 drivers/hwmon/pmbus/adm1266.c | 179 +++++++++++++++++++++++++++++++++-
 1 file changed, 178 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c
index f851c6617870..50386c98d714 100644
--- a/drivers/hwmon/pmbus/adm1266.c
+++ b/drivers/hwmon/pmbus/adm1266.c
@@ -40,7 +40,10 @@
 #define ADM1266_BLACKBOX_INFO	0xE6
 #define ADM1266_PDIO_STATUS	0xE9
 #define ADM1266_GPIO_STATUS	0xEA
+#define ADM1266_STATUS_MFR_2	0xED
+#define ADM1266_REFRESH_FLASH	0xF5
 #define ADM1266_MEMORY_CONFIG	0xF8
+#define ADM1266_MEMORY_CRC	0xF9
 #define ADM1266_SWITCH_MEMORY	0xFA
 #define ADM1266_UPDATE_FW	0xFC
 #define ADM1266_FW_PASSWORD	0xFD
@@ -66,6 +69,11 @@
 
 /* ADM1266 STATUS_MFR defines */
 #define ADM1266_STATUS_PART_LOCKED(x)	FIELD_GET(BIT(2), x)
+#define ADM1266_RUNNING_REFRESH(x)	FIELD_GET(BIT(3), x)
+#define ADM1266_ALL_CRC_FAULT(x)	FIELD_GET(BIT(5), x)
+
+/* ADM1266 STATUS_MFR_2 defines */
+#define ADM1266_MAIN_CONFIG_FAULT(x)	FIELD_GET(GENMASK(9, 8), x)
 
 /* ADM1266 GO_COMMAND defines */
 #define ADM1266_GO_COMMAND_STOP		BIT(0)
@@ -74,6 +82,8 @@
 
 #define ADM1266_FIRMWARE_OFFSET		0x00000
 #define ADM1266_FIRMWARE_SIZE		131072
+#define ADM1266_CONFIG_OFFSET		0x30000
+#define ADM1266_CONFIG_SIZE		131072
 #define ADM1266_BLACKBOX_OFFSET		0x7F700
 #define ADM1266_BLACKBOX_SIZE		64
 
@@ -117,6 +127,11 @@ static const struct nvmem_cell_info adm1266_nvmem_cells[] = {
 		.offset         = ADM1266_FIRMWARE_OFFSET,
 		.bytes          = ADM1266_FIRMWARE_SIZE,
 	},
+	{
+		.name           = "configuration",
+		.offset         = ADM1266_CONFIG_OFFSET,
+		.bytes          = ADM1266_CONFIG_SIZE,
+	},
 };
 
 DECLARE_CRC8_TABLE(pmbus_crc_table);
@@ -520,6 +535,9 @@ static int adm1266_read_mem_cell(struct adm1266_data *data, const struct nvmem_c
 	case ADM1266_FIRMWARE_OFFSET:
 		/* firmware is write-only */
 		return 0;
+	case ADM1266_CONFIG_OFFSET:
+		/* configuration is write-only */
+		return 0;
 	default:
 		return -EINVAL;
 	}
@@ -676,6 +694,7 @@ static int adm1266_write_hex(struct adm1266_data *data,
 	u8 first_writes[7];
 	u8 byte_count;
 	u8 reg_address;
+	bool to_slaves = false;
 	int ret;
 	int i;
 
@@ -706,7 +725,10 @@ static int adm1266_write_hex(struct adm1266_data *data,
 		if (ret < 0)
 			return ret;
 
-		ret = adm1266_group_cmd(data, reg_address, write_buf, byte_count, true);
+		if (offset == ADM1266_FIRMWARE_OFFSET)
+			to_slaves = true;
+
+		ret = adm1266_group_cmd(data, reg_address, write_buf, byte_count, to_slaves);
 		if (ret < 0) {
 			dev_err(&data->client->dev, "Firmware write error: %d.", ret);
 			return ret;
@@ -731,6 +753,87 @@ static int adm1266_write_hex(struct adm1266_data *data,
 	return 0;
 }
 
+static int adm1266_verify_memory(struct adm1266_data *data)
+{
+	char cmd[2];
+	int ret;
+	int reg;
+
+	cmd[0] = 0x1;
+	cmd[1] = 0x0;
+	ret = adm1266_group_cmd(data, ADM1266_MEMORY_CRC, cmd,
+				sizeof(cmd), true);
+	if (ret < 0)
+		return ret;
+
+	/* after issuing a memory recalculate crc command, wait 1000 ms */
+	msleep(1000);
+
+	reg = pmbus_read_word_data(data->client, 0, 0xFF, ADM1266_STATUS_MFR_2);
+	if (reg < 0)
+		return reg;
+
+	if (ADM1266_MAIN_CONFIG_FAULT(reg)) {
+		dev_err(&data->client->dev, "Main memory corrupted.");
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static int adm1266_refresh_memory(struct adm1266_data *data)
+{
+	unsigned int timeout = 9000;
+	int ret;
+	u8 cmd[2];
+
+	cmd[0] = 0x2;
+	ret = adm1266_group_cmd(data, ADM1266_REFRESH_FLASH, cmd, 1, true);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Could not refresh flash.");
+		return ret;
+	}
+
+	/* after issuing a refresh flash command, wait 9000 ms */
+	msleep(9000);
+
+	do {
+		msleep(1000);
+		timeout -= 1000;
+
+		ret = pmbus_read_byte_data(data->client, 0, ADM1266_STATUS_MFR);
+		if (ret < 0) {
+			dev_err(&data->client->dev, "Could not read status.");
+			return ret;
+		}
+
+	} while (ADM1266_RUNNING_REFRESH(ret) && timeout > 0);
+
+	if (timeout == 0)
+		return -ETIMEDOUT;
+
+	cmd[0] = 0x1;
+	cmd[1] = 0x0;
+	ret = adm1266_group_cmd(data, ADM1266_MEMORY_CRC, cmd,
+				sizeof(cmd), true);
+	if (ret < 0)
+		return ret;
+
+	/* after issuing a memory recalculate crc command, wait 1000 ms */
+	msleep(1000);
+
+	ret = pmbus_read_byte_data(data->client, 0, ADM1266_STATUS_MFR);
+	if (ret < 0)
+		return ret;
+
+	if (ADM1266_ALL_CRC_FAULT(ret)) {
+		dev_err(&data->client->dev, "CRC checks failed.");
+		return ret;
+	}
+
+	return 0;
+}
+
 static int adm1266_program_firmware(struct adm1266_data *data)
 {
 	u8 write_data[3];
@@ -783,6 +886,77 @@ static int adm1266_program_firmware(struct adm1266_data *data)
 	return ret;
 }
 
+static int adm1266_program_config(struct adm1266_data *data)
+{
+	u8 cmd[2];
+	u8 value;
+	int ret;
+
+	value = ADM1266_GO_COMMAND_STOP | ADM1266_GO_COMMAND_SEQ_RES;
+	ret = pmbus_write_word_data(data->client, 0, ADM1266_GO_COMMAND, value);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Could not stop sequence.");
+		return ret;
+	}
+
+	/* after issuing a stop command, wait 100 ms */
+	msleep(100);
+
+	ret = adm1266_unlock_all_dev(data);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Could not unlock dev.");
+		goto lock_all_devices;
+	}
+
+	value = 0;
+	ret = i2c_smbus_write_block_data(data->client, ADM1266_SWITCH_MEMORY, 1, &value);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Could not switch to main mem.");
+		goto lock_all_devices;
+	}
+
+	/* after issuing a SWITCH_MEMORY command, wait 1000 ms */
+	msleep(1000);
+
+	ret = adm1266_write_hex(data, ADM1266_CONFIG_OFFSET, ADM1266_CONFIG_SIZE);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Could not write configuration.");
+		goto lock_all_devices;
+	}
+
+	ret = pmbus_write_byte(data->client, 0, ADM1266_STORE_USER_ALL);
+	if (ret < 0)
+		return ret;
+
+	/* after issuing a STORE_USER_ALL command, wait 300 ms */
+	msleep(300);
+
+	if (!data->master_dev)
+		goto lock_all_devices;
+
+	ret = adm1266_verify_memory(data);
+	if (ret < 0)
+		goto lock_all_devices;
+
+	cmd[0] = 0;
+	cmd[1] = 0;
+	ret = adm1266_group_cmd(data, ADM1266_GO_COMMAND, cmd, sizeof(cmd), true);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Could not restart sequence.");
+		goto lock_all_devices;
+	}
+
+	/* after issuing a restart sequence command, wait 350 ms */
+	msleep(350);
+
+	ret = adm1266_refresh_memory(data);
+
+lock_all_devices:
+	adm1266_lock_all_dev(data);
+
+	return ret;
+}
+
 /* check if firmware/config write has ended */
 static bool adm1266_check_ending(struct adm1266_data *data, unsigned int offset,
 				 unsigned int size)
@@ -824,6 +998,9 @@ static int adm1266_write_mem_cell(struct adm1266_data *data,
 
 		program_func = &adm1266_program_firmware;
 		break;
+	case ADM1266_CONFIG_OFFSET:
+		program_func = &adm1266_program_config;
+		break;
 	default:
 		return -EINVAL;
 	}
-- 
2.20.1