@@ -15,12 +15,19 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/nvmem-provider.h>
#include "pmbus.h"
#include <linux/slab.h>
+#include <linux/timekeeping.h>
+#define ADM1266_BLACKBOX_CONFIG 0xD3
#define ADM1266_PDIO_CONFIG 0xD4
#define ADM1266_READ_STATE 0xD9
+#define ADM1266_READ_BLACKBOX 0xDE
+#define ADM1266_SET_RTC 0xDF
#define ADM1266_GPIO_CONFIG 0xE1
+#define ADM1266_BLACKBOX_INFO 0xE6
#define ADM1266_PDIO_STATUS 0xE9
#define ADM1266_GPIO_STATUS 0xEA
@@ -37,6 +44,9 @@
#define ADM1266_PDIO_GLITCH_FILT(x) FIELD_GET(GENMASK(12, 9), x)
#define ADM1266_PDIO_OUT_CFG(x) FIELD_GET(GENMASK(2, 0), x)
+#define ADM1266_BLACKBOX_OFFSET 0x7F700
+#define ADM1266_BLACKBOX_SIZE 64
+
#define ADM1266_PMBUS_BLOCK_MAX 255
struct adm1266_data {
@@ -45,11 +55,22 @@ struct adm1266_data {
const char *gpio_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR];
struct i2c_client *client;
struct dentry *debugfs_dir;
+ struct nvmem_config nvmem_config;
+ struct nvmem_device *nvmem;
+ u8 *dev_mem;
struct mutex buf_mutex;
u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
};
+static const struct nvmem_cell_info adm1266_nvmem_cells[] = {
+ {
+ .name = "blackbox",
+ .offset = ADM1266_BLACKBOX_OFFSET,
+ .bytes = 2048,
+ },
+};
+
DECLARE_CRC8_TABLE(pmbus_crc_table);
/*
@@ -320,6 +341,142 @@ static void adm1266_init_debugfs(struct adm1266_data *data)
adm1266_state_read);
}
+#if IS_ENABLED(CONFIG_NVMEM)
+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 bool adm1266_cell_is_accessed(const struct nvmem_cell_info *mem_cell, unsigned int offset,
+ size_t bytes)
+{
+ unsigned int start_addr = offset;
+ unsigned int end_addr = offset + bytes;
+ unsigned int cell_start = mem_cell->offset;
+ unsigned int cell_end = mem_cell->offset + mem_cell->bytes;
+
+ return start_addr <= cell_end && cell_start <= end_addr;
+}
+
+static int adm1266_read_mem_cell(struct adm1266_data *data, const struct nvmem_cell_info *mem_cell)
+{
+ u8 *mem_offset;
+ int ret;
+
+ switch (mem_cell->offset) {
+ case ADM1266_BLACKBOX_OFFSET:
+ mem_offset = data->dev_mem + mem_cell->offset;
+
+ memset(mem_offset, 0, ADM1266_BLACKBOX_SIZE);
+
+ ret = adm1266_nvmem_read_blackbox(data, mem_offset);
+ if (ret)
+ dev_err(&data->client->dev, "Could not read blackbox!");
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int adm1266_nvmem_read(void *priv, unsigned int offset, void *val,
+ size_t bytes)
+{
+ const struct nvmem_cell_info *mem_cell;
+ struct adm1266_data *data = priv;
+ int ret;
+ int i;
+
+ for (i = 0; i < data->nvmem_config.ncells; i++) {
+ mem_cell = &adm1266_nvmem_cells[i];
+ if (!adm1266_cell_is_accessed(mem_cell, offset, bytes))
+ continue;
+
+ ret = adm1266_read_mem_cell(data, mem_cell);
+ if (ret < 0)
+ 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 = 0x80000;
+
+ 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;
+}
+#else
+static int adm1266_config_nvmem(struct adm1266_data *data)
+{
+ return 0;
+}
+#endif /* CONFIG_NVMEM */
+
+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, const struct i2c_device_id *id)
{
struct adm1266_data *data;
@@ -343,6 +500,14 @@ static int adm1266_probe(struct i2c_client *client, const struct i2c_device_id *
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, id, &data->info);
if (ret)
return ret;