515 lines
12 KiB
C
515 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ADM1266 - Cascadable Super Sequencer with Margin
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* Control and Fault Recording
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*
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* Copyright 2020 Analog Devices Inc.
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*/
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#include <linux/bitfield.h>
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#include <linux/crc8.h>
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#include <linux/debugfs.h>
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#include <linux/gpio/driver.h>
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#include <linux/i2c.h>
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#include <linux/i2c-smbus.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/nvmem-consumer.h>
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#include <linux/nvmem-provider.h>
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#include "pmbus.h"
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#include <linux/slab.h>
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#include <linux/timekeeping.h>
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#define ADM1266_BLACKBOX_CONFIG 0xD3
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#define ADM1266_PDIO_CONFIG 0xD4
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#define ADM1266_READ_STATE 0xD9
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#define ADM1266_READ_BLACKBOX 0xDE
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#define ADM1266_SET_RTC 0xDF
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#define ADM1266_GPIO_CONFIG 0xE1
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#define ADM1266_BLACKBOX_INFO 0xE6
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#define ADM1266_PDIO_STATUS 0xE9
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#define ADM1266_GPIO_STATUS 0xEA
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/* ADM1266 GPIO defines */
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#define ADM1266_GPIO_NR 9
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#define ADM1266_GPIO_FUNCTIONS(x) FIELD_GET(BIT(0), x)
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#define ADM1266_GPIO_INPUT_EN(x) FIELD_GET(BIT(2), x)
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#define ADM1266_GPIO_OUTPUT_EN(x) FIELD_GET(BIT(3), x)
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#define ADM1266_GPIO_OPEN_DRAIN(x) FIELD_GET(BIT(4), x)
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/* ADM1266 PDIO defines */
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#define ADM1266_PDIO_NR 16
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#define ADM1266_PDIO_PIN_CFG(x) FIELD_GET(GENMASK(15, 13), x)
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#define ADM1266_PDIO_GLITCH_FILT(x) FIELD_GET(GENMASK(12, 9), x)
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#define ADM1266_PDIO_OUT_CFG(x) FIELD_GET(GENMASK(2, 0), x)
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#define ADM1266_BLACKBOX_OFFSET 0
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#define ADM1266_BLACKBOX_SIZE 64
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#define ADM1266_PMBUS_BLOCK_MAX 255
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struct adm1266_data {
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struct pmbus_driver_info info;
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struct gpio_chip gc;
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const char *gpio_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR];
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struct i2c_client *client;
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struct dentry *debugfs_dir;
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struct nvmem_config nvmem_config;
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struct nvmem_device *nvmem;
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u8 *dev_mem;
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struct mutex buf_mutex;
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u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
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u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
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};
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static const struct nvmem_cell_info adm1266_nvmem_cells[] = {
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{
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.name = "blackbox",
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.offset = ADM1266_BLACKBOX_OFFSET,
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.bytes = 2048,
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},
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};
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DECLARE_CRC8_TABLE(pmbus_crc_table);
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/*
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* Different from Block Read as it sends data and waits for the slave to
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* return a value dependent on that data. The protocol is simply a Write Block
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* followed by a Read Block without the Read-Block command field and the
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* Write-Block STOP bit.
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*/
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static int adm1266_pmbus_block_xfer(struct adm1266_data *data, u8 cmd, u8 w_len, u8 *data_w,
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u8 *data_r)
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{
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struct i2c_client *client = data->client;
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struct i2c_msg msgs[2] = {
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{
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.addr = client->addr,
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.flags = I2C_M_DMA_SAFE,
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.buf = data->write_buf,
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.len = w_len + 2,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD | I2C_M_DMA_SAFE,
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.buf = data->read_buf,
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.len = ADM1266_PMBUS_BLOCK_MAX + 2,
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}
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};
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u8 addr;
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u8 crc;
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int ret;
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mutex_lock(&data->buf_mutex);
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msgs[0].buf[0] = cmd;
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msgs[0].buf[1] = w_len;
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memcpy(&msgs[0].buf[2], data_w, w_len);
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ret = i2c_transfer(client->adapter, msgs, 2);
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if (ret != 2) {
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if (ret >= 0)
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ret = -EPROTO;
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mutex_unlock(&data->buf_mutex);
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return ret;
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}
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if (client->flags & I2C_CLIENT_PEC) {
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addr = i2c_8bit_addr_from_msg(&msgs[0]);
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crc = crc8(pmbus_crc_table, &addr, 1, 0);
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crc = crc8(pmbus_crc_table, msgs[0].buf, msgs[0].len, crc);
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addr = i2c_8bit_addr_from_msg(&msgs[1]);
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crc = crc8(pmbus_crc_table, &addr, 1, crc);
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crc = crc8(pmbus_crc_table, msgs[1].buf, msgs[1].buf[0] + 1, crc);
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if (crc != msgs[1].buf[msgs[1].buf[0] + 1]) {
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mutex_unlock(&data->buf_mutex);
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return -EBADMSG;
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}
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}
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memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]);
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ret = msgs[1].buf[0];
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mutex_unlock(&data->buf_mutex);
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return ret;
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}
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static const unsigned int adm1266_gpio_mapping[ADM1266_GPIO_NR][2] = {
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{1, 0},
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{2, 1},
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{3, 2},
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{4, 8},
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{5, 9},
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{6, 10},
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{7, 11},
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{8, 6},
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{9, 7},
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};
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static const char *adm1266_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR] = {
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"GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5", "GPIO6", "GPIO7", "GPIO8",
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"GPIO9", "PDIO1", "PDIO2", "PDIO3", "PDIO4", "PDIO5", "PDIO6",
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"PDIO7", "PDIO8", "PDIO9", "PDIO10", "PDIO11", "PDIO12", "PDIO13",
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"PDIO14", "PDIO15", "PDIO16",
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};
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static int adm1266_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct adm1266_data *data = gpiochip_get_data(chip);
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u8 read_buf[I2C_SMBUS_BLOCK_MAX + 1];
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unsigned long pins_status;
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unsigned int pmbus_cmd;
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int ret;
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if (offset < ADM1266_GPIO_NR)
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pmbus_cmd = ADM1266_GPIO_STATUS;
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else
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pmbus_cmd = ADM1266_PDIO_STATUS;
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ret = i2c_smbus_read_block_data(data->client, pmbus_cmd, read_buf);
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if (ret < 0)
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return ret;
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pins_status = read_buf[0] + (read_buf[1] << 8);
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if (offset < ADM1266_GPIO_NR)
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return test_bit(adm1266_gpio_mapping[offset][1], &pins_status);
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return test_bit(offset - ADM1266_GPIO_NR, &pins_status);
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}
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static int adm1266_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
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unsigned long *bits)
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{
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struct adm1266_data *data = gpiochip_get_data(chip);
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u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];
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unsigned long status;
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unsigned int gpio_nr;
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int ret;
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ret = i2c_smbus_read_block_data(data->client, ADM1266_GPIO_STATUS, read_buf);
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if (ret < 0)
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return ret;
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status = read_buf[0] + (read_buf[1] << 8);
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*bits = 0;
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for_each_set_bit(gpio_nr, mask, ADM1266_GPIO_NR) {
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if (test_bit(adm1266_gpio_mapping[gpio_nr][1], &status))
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set_bit(gpio_nr, bits);
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}
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ret = i2c_smbus_read_block_data(data->client, ADM1266_PDIO_STATUS, read_buf);
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if (ret < 0)
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return ret;
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status = read_buf[0] + (read_buf[1] << 8);
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*bits = 0;
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for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) {
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if (test_bit(gpio_nr - ADM1266_GPIO_NR, &status))
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set_bit(gpio_nr, bits);
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}
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return 0;
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}
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static void adm1266_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
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{
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struct adm1266_data *data = gpiochip_get_data(chip);
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u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];
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unsigned long gpio_config;
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unsigned long pdio_config;
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unsigned long pin_cfg;
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u8 write_cmd;
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int ret;
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int i;
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for (i = 0; i < ADM1266_GPIO_NR; i++) {
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write_cmd = adm1266_gpio_mapping[i][1];
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ret = adm1266_pmbus_block_xfer(data, ADM1266_GPIO_CONFIG, 1, &write_cmd, read_buf);
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if (ret != 2)
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return;
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gpio_config = read_buf[0];
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seq_puts(s, adm1266_names[i]);
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seq_puts(s, " ( ");
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if (!ADM1266_GPIO_FUNCTIONS(gpio_config)) {
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seq_puts(s, "high-Z )\n");
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continue;
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}
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if (ADM1266_GPIO_INPUT_EN(gpio_config))
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seq_puts(s, "input ");
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if (ADM1266_GPIO_OUTPUT_EN(gpio_config))
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seq_puts(s, "output ");
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if (ADM1266_GPIO_OPEN_DRAIN(gpio_config))
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seq_puts(s, "open-drain )\n");
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else
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seq_puts(s, "push-pull )\n");
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}
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write_cmd = 0xFF;
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ret = adm1266_pmbus_block_xfer(data, ADM1266_PDIO_CONFIG, 1, &write_cmd, read_buf);
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if (ret != 32)
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return;
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for (i = 0; i < ADM1266_PDIO_NR; i++) {
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seq_puts(s, adm1266_names[ADM1266_GPIO_NR + i]);
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pdio_config = read_buf[2 * i];
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pdio_config += (read_buf[2 * i + 1] << 8);
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pin_cfg = ADM1266_PDIO_PIN_CFG(pdio_config);
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seq_puts(s, " ( ");
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if (!pin_cfg || pin_cfg > 5) {
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seq_puts(s, "high-Z )\n");
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continue;
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}
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if (pin_cfg & BIT(0))
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seq_puts(s, "output ");
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if (pin_cfg & BIT(1))
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seq_puts(s, "input ");
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seq_puts(s, ")\n");
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}
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}
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static int adm1266_config_gpio(struct adm1266_data *data)
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{
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const char *name = dev_name(&data->client->dev);
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char *gpio_name;
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int ret;
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int i;
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for (i = 0; i < ARRAY_SIZE(data->gpio_names); i++) {
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gpio_name = devm_kasprintf(&data->client->dev, GFP_KERNEL, "adm1266-%x-%s",
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data->client->addr, adm1266_names[i]);
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if (!gpio_name)
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return -ENOMEM;
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data->gpio_names[i] = gpio_name;
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}
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data->gc.label = name;
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data->gc.parent = &data->client->dev;
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data->gc.owner = THIS_MODULE;
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data->gc.can_sleep = true;
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data->gc.base = -1;
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data->gc.names = data->gpio_names;
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data->gc.ngpio = ARRAY_SIZE(data->gpio_names);
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data->gc.get = adm1266_gpio_get;
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data->gc.get_multiple = adm1266_gpio_get_multiple;
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data->gc.dbg_show = adm1266_gpio_dbg_show;
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ret = devm_gpiochip_add_data(&data->client->dev, &data->gc, data);
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if (ret)
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dev_err(&data->client->dev, "GPIO registering failed (%d)\n", ret);
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return ret;
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}
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static int adm1266_state_read(struct seq_file *s, void *pdata)
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{
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struct device *dev = s->private;
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struct i2c_client *client = to_i2c_client(dev);
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int ret;
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ret = i2c_smbus_read_word_data(client, ADM1266_READ_STATE);
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if (ret < 0)
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return ret;
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seq_printf(s, "%d\n", ret);
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return 0;
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}
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static void adm1266_init_debugfs(struct adm1266_data *data)
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{
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struct dentry *root;
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root = pmbus_get_debugfs_dir(data->client);
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if (!root)
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return;
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data->debugfs_dir = debugfs_create_dir(data->client->name, root);
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if (!data->debugfs_dir)
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return;
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debugfs_create_devm_seqfile(&data->client->dev, "sequencer_state", data->debugfs_dir,
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adm1266_state_read);
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}
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static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *read_buff)
|
||
|
|
{
|
||
|
|
int record_count;
|
||
|
|
char index;
|
||
|
|
u8 buf[5];
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = i2c_smbus_read_block_data(data->client, ADM1266_BLACKBOX_INFO, buf);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (ret != 4)
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
record_count = buf[3];
|
||
|
|
|
||
|
|
for (index = 0; index < record_count; index++) {
|
||
|
|
ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, read_buff);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (ret != ADM1266_BLACKBOX_SIZE)
|
||
|
|
return -EIO;
|
||
|
|
|
||
|
|
read_buff += ADM1266_BLACKBOX_SIZE;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adm1266_nvmem_read(void *priv, unsigned int offset, void *val, size_t bytes)
|
||
|
|
{
|
||
|
|
struct adm1266_data *data = priv;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (offset + bytes > data->nvmem_config.size)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (offset == 0) {
|
||
|
|
memset(data->dev_mem, 0, data->nvmem_config.size);
|
||
|
|
|
||
|
|
ret = adm1266_nvmem_read_blackbox(data, data->dev_mem);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&data->client->dev, "Could not read blackbox!");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
memcpy(val, data->dev_mem + offset, bytes);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adm1266_config_nvmem(struct adm1266_data *data)
|
||
|
|
{
|
||
|
|
data->nvmem_config.name = dev_name(&data->client->dev);
|
||
|
|
data->nvmem_config.dev = &data->client->dev;
|
||
|
|
data->nvmem_config.root_only = true;
|
||
|
|
data->nvmem_config.read_only = true;
|
||
|
|
data->nvmem_config.owner = THIS_MODULE;
|
||
|
|
data->nvmem_config.reg_read = adm1266_nvmem_read;
|
||
|
|
data->nvmem_config.cells = adm1266_nvmem_cells;
|
||
|
|
data->nvmem_config.ncells = ARRAY_SIZE(adm1266_nvmem_cells);
|
||
|
|
data->nvmem_config.priv = data;
|
||
|
|
data->nvmem_config.stride = 1;
|
||
|
|
data->nvmem_config.word_size = 1;
|
||
|
|
data->nvmem_config.size = adm1266_nvmem_cells[0].bytes;
|
||
|
|
|
||
|
|
data->dev_mem = devm_kzalloc(&data->client->dev, data->nvmem_config.size, GFP_KERNEL);
|
||
|
|
if (!data->dev_mem)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
data->nvmem = devm_nvmem_register(&data->client->dev, &data->nvmem_config);
|
||
|
|
if (IS_ERR(data->nvmem)) {
|
||
|
|
dev_err(&data->client->dev, "Could not register nvmem!");
|
||
|
|
return PTR_ERR(data->nvmem);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adm1266_set_rtc(struct adm1266_data *data)
|
||
|
|
{
|
||
|
|
time64_t kt;
|
||
|
|
char write_buf[6];
|
||
|
|
int i;
|
||
|
|
|
||
|
|
kt = ktime_get_seconds();
|
||
|
|
|
||
|
|
memset(write_buf, 0, sizeof(write_buf));
|
||
|
|
|
||
|
|
for (i = 0; i < 4; i++)
|
||
|
|
write_buf[2 + i] = (kt >> (i * 8)) & 0xFF;
|
||
|
|
|
||
|
|
return i2c_smbus_write_block_data(data->client, ADM1266_SET_RTC, sizeof(write_buf),
|
||
|
|
write_buf);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adm1266_probe(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
struct adm1266_data *data;
|
||
|
|
int ret;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
data = devm_kzalloc(&client->dev, sizeof(struct adm1266_data), GFP_KERNEL);
|
||
|
|
if (!data)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
data->client = client;
|
||
|
|
data->info.pages = 17;
|
||
|
|
data->info.format[PSC_VOLTAGE_OUT] = linear;
|
||
|
|
for (i = 0; i < data->info.pages; i++)
|
||
|
|
data->info.func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
|
||
|
|
|
||
|
|
crc8_populate_msb(pmbus_crc_table, 0x7);
|
||
|
|
mutex_init(&data->buf_mutex);
|
||
|
|
|
||
|
|
ret = adm1266_config_gpio(data);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = adm1266_set_rtc(data);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = adm1266_config_nvmem(data);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = pmbus_do_probe(client, &data->info);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
adm1266_init_debugfs(data);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id adm1266_of_match[] = {
|
||
|
|
{ .compatible = "adi,adm1266" },
|
||
|
|
{ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, adm1266_of_match);
|
||
|
|
|
||
|
|
static const struct i2c_device_id adm1266_id[] = {
|
||
|
|
{ "adm1266", 0 },
|
||
|
|
{ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(i2c, adm1266_id);
|
||
|
|
|
||
|
|
static struct i2c_driver adm1266_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "adm1266",
|
||
|
|
.of_match_table = adm1266_of_match,
|
||
|
|
},
|
||
|
|
.probe_new = adm1266_probe,
|
||
|
|
.id_table = adm1266_id,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_i2c_driver(adm1266_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>");
|
||
|
|
MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1266");
|
||
|
|
MODULE_LICENSE("GPL v2");
|
||
|
|
MODULE_IMPORT_NS(PMBUS);
|