2018-11-08 21:05:21 +00:00
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/fsi-sbefifo.h>
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#include <linux/gfp.h>
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#include <linux/idr.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/miscdevice.h>
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2021-10-19 20:53:04 +00:00
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#include <linux/mm.h>
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2018-11-08 21:05:21 +00:00
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/fsi-occ.h>
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#include <linux/of.h>
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2020-11-20 01:03:14 +00:00
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#include <linux/of_device.h>
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2018-11-08 21:05:21 +00:00
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <asm/unaligned.h>
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#define OCC_SRAM_BYTES 4096
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#define OCC_CMD_DATA_BYTES 4090
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#define OCC_RESP_DATA_BYTES 4089
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2020-11-20 01:03:14 +00:00
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#define OCC_P9_SRAM_CMD_ADDR 0xFFFBE000
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#define OCC_P9_SRAM_RSP_ADDR 0xFFFBF000
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#define OCC_P10_SRAM_CMD_ADDR 0xFFFFD000
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#define OCC_P10_SRAM_RSP_ADDR 0xFFFFE000
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#define OCC_P10_SRAM_MODE 0x58 /* Normal mode, OCB channel 2 */
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2018-11-08 21:05:21 +00:00
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#define OCC_TIMEOUT_MS 1000
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#define OCC_CMD_IN_PRG_WAIT_MS 50
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2020-11-20 01:03:14 +00:00
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enum versions { occ_p9, occ_p10 };
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2018-11-08 21:05:21 +00:00
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struct occ {
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struct device *dev;
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struct device *sbefifo;
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char name[32];
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int idx;
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2021-07-21 19:02:29 +00:00
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u8 sequence_number;
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2021-10-19 20:53:04 +00:00
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void *buffer;
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2021-10-19 20:53:05 +00:00
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void *client_buffer;
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size_t client_buffer_size;
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size_t client_response_size;
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2020-11-20 01:03:14 +00:00
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enum versions version;
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2018-11-08 21:05:21 +00:00
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struct miscdevice mdev;
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struct mutex occ_lock;
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};
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#define to_occ(x) container_of((x), struct occ, mdev)
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struct occ_response {
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u8 seq_no;
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u8 cmd_type;
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u8 return_status;
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__be16 data_length;
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u8 data[OCC_RESP_DATA_BYTES + 2]; /* two bytes checksum */
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} __packed;
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struct occ_client {
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struct occ *occ;
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struct mutex lock;
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size_t data_size;
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size_t read_offset;
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u8 *buffer;
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};
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#define to_client(x) container_of((x), struct occ_client, xfr)
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static DEFINE_IDA(occ_ida);
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static int occ_open(struct inode *inode, struct file *file)
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{
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struct occ_client *client = kzalloc(sizeof(*client), GFP_KERNEL);
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struct miscdevice *mdev = file->private_data;
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struct occ *occ = to_occ(mdev);
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if (!client)
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return -ENOMEM;
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client->buffer = (u8 *)__get_free_page(GFP_KERNEL);
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if (!client->buffer) {
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kfree(client);
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return -ENOMEM;
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}
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client->occ = occ;
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mutex_init(&client->lock);
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file->private_data = client;
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/* We allocate a 1-page buffer, make sure it all fits */
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BUILD_BUG_ON((OCC_CMD_DATA_BYTES + 3) > PAGE_SIZE);
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BUILD_BUG_ON((OCC_RESP_DATA_BYTES + 7) > PAGE_SIZE);
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return 0;
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}
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static ssize_t occ_read(struct file *file, char __user *buf, size_t len,
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loff_t *offset)
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{
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struct occ_client *client = file->private_data;
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ssize_t rc = 0;
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if (!client)
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return -ENODEV;
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if (len > OCC_SRAM_BYTES)
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return -EINVAL;
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mutex_lock(&client->lock);
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/* This should not be possible ... */
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if (WARN_ON_ONCE(client->read_offset > client->data_size)) {
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rc = -EIO;
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goto done;
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}
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/* Grab how much data we have to read */
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rc = min(len, client->data_size - client->read_offset);
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if (copy_to_user(buf, client->buffer + client->read_offset, rc))
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rc = -EFAULT;
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else
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client->read_offset += rc;
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done:
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mutex_unlock(&client->lock);
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return rc;
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}
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static ssize_t occ_write(struct file *file, const char __user *buf,
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size_t len, loff_t *offset)
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{
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struct occ_client *client = file->private_data;
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size_t rlen, data_length;
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2021-07-21 19:02:29 +00:00
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ssize_t rc;
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2018-11-08 21:05:21 +00:00
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u8 *cmd;
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if (!client)
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return -ENODEV;
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if (len > (OCC_CMD_DATA_BYTES + 3) || len < 3)
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return -EINVAL;
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mutex_lock(&client->lock);
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/* Construct the command */
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cmd = client->buffer;
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/*
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* Copy the user command (assume user data follows the occ command
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* format)
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* byte 0: command type
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* bytes 1-2: data length (msb first)
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* bytes 3-n: data
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*/
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if (copy_from_user(&cmd[1], buf, len)) {
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rc = -EFAULT;
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goto done;
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}
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/* Extract data length */
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data_length = (cmd[2] << 8) + cmd[3];
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if (data_length > OCC_CMD_DATA_BYTES) {
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rc = -EINVAL;
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goto done;
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}
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2021-07-21 19:02:29 +00:00
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/* Submit command; 4 bytes before the data and 2 bytes after */
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2018-11-08 21:05:21 +00:00
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rlen = PAGE_SIZE;
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rc = fsi_occ_submit(client->occ->dev, cmd, data_length + 6, cmd,
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&rlen);
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if (rc)
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goto done;
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/* Set read tracking data */
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client->data_size = rlen;
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client->read_offset = 0;
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/* Done */
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rc = len;
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done:
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mutex_unlock(&client->lock);
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return rc;
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}
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static int occ_release(struct inode *inode, struct file *file)
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{
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struct occ_client *client = file->private_data;
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free_page((unsigned long)client->buffer);
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kfree(client);
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return 0;
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}
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static const struct file_operations occ_fops = {
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.owner = THIS_MODULE,
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.open = occ_open,
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.read = occ_read,
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.write = occ_write,
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.release = occ_release,
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};
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2021-10-19 20:53:05 +00:00
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static void occ_save_ffdc(struct occ *occ, __be32 *resp, size_t parsed_len,
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size_t resp_len)
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{
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if (resp_len > parsed_len) {
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size_t dh = resp_len - parsed_len;
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size_t ffdc_len = (dh - 1) * 4; /* SBE words are four bytes */
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__be32 *ffdc = &resp[parsed_len];
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if (ffdc_len > occ->client_buffer_size)
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ffdc_len = occ->client_buffer_size;
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memcpy(occ->client_buffer, ffdc, ffdc_len);
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occ->client_response_size = ffdc_len;
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}
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}
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2021-02-09 17:12:33 +00:00
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static int occ_verify_checksum(struct occ *occ, struct occ_response *resp,
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u16 data_length)
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2018-11-08 21:05:21 +00:00
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{
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/* Fetch the two bytes after the data for the checksum. */
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u16 checksum_resp = get_unaligned_be16(&resp->data[data_length]);
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u16 checksum;
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u16 i;
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checksum = resp->seq_no;
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checksum += resp->cmd_type;
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checksum += resp->return_status;
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checksum += (data_length >> 8) + (data_length & 0xFF);
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for (i = 0; i < data_length; ++i)
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checksum += resp->data[i];
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2021-02-09 17:12:33 +00:00
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if (checksum != checksum_resp) {
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dev_err(occ->dev, "Bad checksum: %04x!=%04x\n", checksum,
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checksum_resp);
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2018-11-08 21:05:21 +00:00
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return -EBADMSG;
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2021-02-09 17:12:33 +00:00
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}
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2018-11-08 21:05:21 +00:00
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return 0;
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}
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2020-11-20 01:03:14 +00:00
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static int occ_getsram(struct occ *occ, u32 offset, void *data, ssize_t len)
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2018-11-08 21:05:21 +00:00
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{
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u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */
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2021-10-19 20:53:05 +00:00
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size_t cmd_len, parsed_len, resp_data_len;
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2021-10-19 20:53:04 +00:00
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size_t resp_len = OCC_MAX_RESP_WORDS;
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__be32 *resp = occ->buffer;
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__be32 cmd[6];
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2020-11-20 01:03:14 +00:00
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int idx = 0, rc;
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2018-11-08 21:05:21 +00:00
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/*
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* Magic sequence to do SBE getsram command. SBE will fetch data from
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* specified SRAM address.
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*/
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2020-11-20 01:03:14 +00:00
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switch (occ->version) {
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default:
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case occ_p9:
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cmd_len = 5;
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cmd[2] = cpu_to_be32(1); /* Normal mode */
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cmd[3] = cpu_to_be32(OCC_P9_SRAM_RSP_ADDR + offset);
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break;
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case occ_p10:
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idx = 1;
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cmd_len = 6;
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cmd[2] = cpu_to_be32(OCC_P10_SRAM_MODE);
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cmd[3] = 0;
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cmd[4] = cpu_to_be32(OCC_P10_SRAM_RSP_ADDR + offset);
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break;
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}
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cmd[0] = cpu_to_be32(cmd_len);
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2018-11-08 21:05:21 +00:00
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cmd[1] = cpu_to_be32(SBEFIFO_CMD_GET_OCC_SRAM);
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2020-11-20 01:03:14 +00:00
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cmd[4 + idx] = cpu_to_be32(data_len);
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2018-11-08 21:05:21 +00:00
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2020-11-20 01:03:14 +00:00
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rc = sbefifo_submit(occ->sbefifo, cmd, cmd_len, resp, &resp_len);
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2018-11-08 21:05:21 +00:00
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if (rc)
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2021-10-19 20:53:04 +00:00
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return rc;
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2018-11-08 21:05:21 +00:00
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rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_GET_OCC_SRAM,
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2021-10-19 20:53:05 +00:00
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resp, resp_len, &parsed_len);
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2021-10-19 20:53:04 +00:00
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if (rc > 0) {
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dev_err(occ->dev, "SRAM read returned failure status: %08x\n",
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rc);
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2021-10-19 20:53:05 +00:00
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occ_save_ffdc(occ, resp, parsed_len, resp_len);
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return -ECOMM;
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2021-10-19 20:53:04 +00:00
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} else if (rc) {
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return rc;
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}
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2018-11-08 21:05:21 +00:00
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2021-10-19 20:53:05 +00:00
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resp_data_len = be32_to_cpu(resp[parsed_len - 1]);
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2018-11-08 21:05:21 +00:00
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if (resp_data_len != data_len) {
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dev_err(occ->dev, "SRAM read expected %d bytes got %zd\n",
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data_len, resp_data_len);
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rc = -EBADMSG;
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} else {
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memcpy(data, resp, len);
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}
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return rc;
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}
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2021-07-21 19:02:29 +00:00
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static int occ_putsram(struct occ *occ, const void *data, ssize_t len,
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u8 seq_no, u16 checksum)
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2018-11-08 21:05:21 +00:00
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{
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u32 data_len = ((len + 7) / 8) * 8; /* must be multiples of 8 B */
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2021-10-19 20:53:05 +00:00
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size_t cmd_len, parsed_len, resp_data_len;
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2021-10-19 20:53:04 +00:00
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size_t resp_len = OCC_MAX_RESP_WORDS;
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__be32 *buf = occ->buffer;
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2021-07-21 19:02:29 +00:00
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u8 *byte_buf;
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2020-11-20 01:03:14 +00:00
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int idx = 0, rc;
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cmd_len = (occ->version == occ_p10) ? 6 : 5;
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cmd_len += data_len >> 2;
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2018-11-08 21:05:21 +00:00
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/*
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* Magic sequence to do SBE putsram command. SBE will transfer
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* data to specified SRAM address.
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*/
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buf[0] = cpu_to_be32(cmd_len);
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buf[1] = cpu_to_be32(SBEFIFO_CMD_PUT_OCC_SRAM);
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2020-11-20 01:03:14 +00:00
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switch (occ->version) {
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default:
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case occ_p9:
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buf[2] = cpu_to_be32(1); /* Normal mode */
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buf[3] = cpu_to_be32(OCC_P9_SRAM_CMD_ADDR);
|
|
|
|
break;
|
|
|
|
case occ_p10:
|
|
|
|
idx = 1;
|
|
|
|
buf[2] = cpu_to_be32(OCC_P10_SRAM_MODE);
|
|
|
|
buf[3] = 0;
|
|
|
|
buf[4] = cpu_to_be32(OCC_P10_SRAM_CMD_ADDR);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
buf[4 + idx] = cpu_to_be32(data_len);
|
|
|
|
memcpy(&buf[5 + idx], data, len);
|
2018-11-08 21:05:21 +00:00
|
|
|
|
2021-07-21 19:02:29 +00:00
|
|
|
byte_buf = (u8 *)&buf[5 + idx];
|
|
|
|
/*
|
|
|
|
* Overwrite the first byte with our sequence number and the last two
|
|
|
|
* bytes with the checksum.
|
|
|
|
*/
|
|
|
|
byte_buf[0] = seq_no;
|
|
|
|
byte_buf[len - 2] = checksum >> 8;
|
|
|
|
byte_buf[len - 1] = checksum & 0xff;
|
|
|
|
|
2018-11-08 21:05:21 +00:00
|
|
|
rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len);
|
|
|
|
if (rc)
|
2021-10-19 20:53:04 +00:00
|
|
|
return rc;
|
2018-11-08 21:05:21 +00:00
|
|
|
|
|
|
|
rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM,
|
2021-10-19 20:53:05 +00:00
|
|
|
buf, resp_len, &parsed_len);
|
2021-10-19 20:53:04 +00:00
|
|
|
if (rc > 0) {
|
|
|
|
dev_err(occ->dev, "SRAM write returned failure status: %08x\n",
|
|
|
|
rc);
|
2021-10-19 20:53:05 +00:00
|
|
|
occ_save_ffdc(occ, buf, parsed_len, resp_len);
|
|
|
|
return -ECOMM;
|
2021-10-19 20:53:04 +00:00
|
|
|
} else if (rc) {
|
|
|
|
return rc;
|
|
|
|
}
|
2018-11-08 21:05:21 +00:00
|
|
|
|
2021-10-19 20:53:05 +00:00
|
|
|
if (parsed_len != 1) {
|
2018-11-08 21:05:21 +00:00
|
|
|
dev_err(occ->dev, "SRAM write response length invalid: %zd\n",
|
2021-10-19 20:53:05 +00:00
|
|
|
parsed_len);
|
2018-11-08 21:05:21 +00:00
|
|
|
rc = -EBADMSG;
|
|
|
|
} else {
|
|
|
|
resp_data_len = be32_to_cpu(buf[0]);
|
|
|
|
if (resp_data_len != data_len) {
|
|
|
|
dev_err(occ->dev,
|
|
|
|
"SRAM write expected %d bytes got %zd\n",
|
|
|
|
data_len, resp_data_len);
|
|
|
|
rc = -EBADMSG;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int occ_trigger_attn(struct occ *occ)
|
|
|
|
{
|
2021-10-19 20:53:04 +00:00
|
|
|
__be32 *buf = occ->buffer;
|
2021-10-19 20:53:05 +00:00
|
|
|
size_t cmd_len, parsed_len, resp_data_len;
|
2021-10-19 20:53:04 +00:00
|
|
|
size_t resp_len = OCC_MAX_RESP_WORDS;
|
2020-11-20 01:03:14 +00:00
|
|
|
int idx = 0, rc;
|
2018-11-08 21:05:21 +00:00
|
|
|
|
2020-11-20 01:03:14 +00:00
|
|
|
switch (occ->version) {
|
|
|
|
default:
|
|
|
|
case occ_p9:
|
|
|
|
cmd_len = 7;
|
|
|
|
buf[2] = cpu_to_be32(3); /* Circular mode */
|
|
|
|
buf[3] = 0;
|
|
|
|
break;
|
|
|
|
case occ_p10:
|
|
|
|
idx = 1;
|
|
|
|
cmd_len = 8;
|
|
|
|
buf[2] = cpu_to_be32(0xd0); /* Circular mode, OCB Channel 1 */
|
|
|
|
buf[3] = 0;
|
|
|
|
buf[4] = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
buf[0] = cpu_to_be32(cmd_len); /* Chip-op length in words */
|
2018-11-08 21:05:21 +00:00
|
|
|
buf[1] = cpu_to_be32(SBEFIFO_CMD_PUT_OCC_SRAM);
|
2020-11-20 01:03:14 +00:00
|
|
|
buf[4 + idx] = cpu_to_be32(8); /* Data length in bytes */
|
|
|
|
buf[5 + idx] = cpu_to_be32(0x20010000); /* Trigger OCC attention */
|
|
|
|
buf[6 + idx] = 0;
|
2018-11-08 21:05:21 +00:00
|
|
|
|
2020-11-20 01:03:14 +00:00
|
|
|
rc = sbefifo_submit(occ->sbefifo, buf, cmd_len, buf, &resp_len);
|
2018-11-08 21:05:21 +00:00
|
|
|
if (rc)
|
2021-10-19 20:53:04 +00:00
|
|
|
return rc;
|
2018-11-08 21:05:21 +00:00
|
|
|
|
|
|
|
rc = sbefifo_parse_status(occ->sbefifo, SBEFIFO_CMD_PUT_OCC_SRAM,
|
2021-10-19 20:53:05 +00:00
|
|
|
buf, resp_len, &parsed_len);
|
2021-10-19 20:53:04 +00:00
|
|
|
if (rc > 0) {
|
|
|
|
dev_err(occ->dev, "SRAM attn returned failure status: %08x\n",
|
|
|
|
rc);
|
2021-10-19 20:53:05 +00:00
|
|
|
occ_save_ffdc(occ, buf, parsed_len, resp_len);
|
|
|
|
return -ECOMM;
|
2021-10-19 20:53:04 +00:00
|
|
|
} else if (rc) {
|
|
|
|
return rc;
|
|
|
|
}
|
2018-11-08 21:05:21 +00:00
|
|
|
|
2021-10-19 20:53:05 +00:00
|
|
|
if (parsed_len != 1) {
|
2018-11-08 21:05:21 +00:00
|
|
|
dev_err(occ->dev, "SRAM attn response length invalid: %zd\n",
|
2021-10-19 20:53:05 +00:00
|
|
|
parsed_len);
|
2018-11-08 21:05:21 +00:00
|
|
|
rc = -EBADMSG;
|
|
|
|
} else {
|
|
|
|
resp_data_len = be32_to_cpu(buf[0]);
|
|
|
|
if (resp_data_len != 8) {
|
|
|
|
dev_err(occ->dev,
|
|
|
|
"SRAM attn expected 8 bytes got %zd\n",
|
|
|
|
resp_data_len);
|
|
|
|
rc = -EBADMSG;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2022-02-08 15:22:35 +00:00
|
|
|
static bool fsi_occ_response_not_ready(struct occ_response *resp, u8 seq_no,
|
|
|
|
u8 cmd_type)
|
|
|
|
{
|
|
|
|
return resp->return_status == OCC_RESP_CMD_IN_PRG ||
|
|
|
|
resp->return_status == OCC_RESP_CRIT_INIT ||
|
|
|
|
resp->seq_no != seq_no || resp->cmd_type != cmd_type;
|
|
|
|
}
|
|
|
|
|
2018-11-08 21:05:21 +00:00
|
|
|
int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
|
|
|
|
void *response, size_t *resp_len)
|
|
|
|
{
|
|
|
|
const unsigned long timeout = msecs_to_jiffies(OCC_TIMEOUT_MS);
|
|
|
|
const unsigned long wait_time =
|
|
|
|
msecs_to_jiffies(OCC_CMD_IN_PRG_WAIT_MS);
|
|
|
|
struct occ *occ = dev_get_drvdata(dev);
|
|
|
|
struct occ_response *resp = response;
|
2021-10-19 20:53:05 +00:00
|
|
|
size_t user_resp_len = *resp_len;
|
2019-07-02 15:47:42 +00:00
|
|
|
u8 seq_no;
|
2022-02-08 15:22:35 +00:00
|
|
|
u8 cmd_type;
|
2021-07-21 19:02:29 +00:00
|
|
|
u16 checksum = 0;
|
2018-11-08 21:05:21 +00:00
|
|
|
u16 resp_data_length;
|
2021-07-21 19:02:29 +00:00
|
|
|
const u8 *byte_request = (const u8 *)request;
|
2022-02-08 15:22:35 +00:00
|
|
|
unsigned long end;
|
2018-11-08 21:05:21 +00:00
|
|
|
int rc;
|
2021-07-21 19:02:29 +00:00
|
|
|
size_t i;
|
2018-11-08 21:05:21 +00:00
|
|
|
|
2021-10-19 20:53:05 +00:00
|
|
|
*resp_len = 0;
|
|
|
|
|
2018-11-08 21:05:21 +00:00
|
|
|
if (!occ)
|
|
|
|
return -ENODEV;
|
|
|
|
|
2021-10-19 20:53:05 +00:00
|
|
|
if (user_resp_len < 7) {
|
|
|
|
dev_dbg(dev, "Bad resplen %zd\n", user_resp_len);
|
2018-11-08 21:05:21 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2022-02-08 15:22:35 +00:00
|
|
|
cmd_type = byte_request[1];
|
|
|
|
|
2021-07-21 19:02:29 +00:00
|
|
|
/* Checksum the request, ignoring first byte (sequence number). */
|
|
|
|
for (i = 1; i < req_len - 2; ++i)
|
|
|
|
checksum += byte_request[i];
|
|
|
|
|
2018-11-08 21:05:21 +00:00
|
|
|
mutex_lock(&occ->occ_lock);
|
|
|
|
|
2021-10-19 20:53:05 +00:00
|
|
|
occ->client_buffer = response;
|
|
|
|
occ->client_buffer_size = user_resp_len;
|
|
|
|
occ->client_response_size = 0;
|
|
|
|
|
2021-07-21 19:02:29 +00:00
|
|
|
/*
|
|
|
|
* Get a sequence number and update the counter. Avoid a sequence
|
|
|
|
* number of 0 which would pass the response check below even if the
|
|
|
|
* OCC response is uninitialized. Any sequence number the user is
|
|
|
|
* trying to send is overwritten since this function is the only common
|
|
|
|
* interface to the OCC and therefore the only place we can guarantee
|
|
|
|
* unique sequence numbers.
|
|
|
|
*/
|
|
|
|
seq_no = occ->sequence_number++;
|
|
|
|
if (!occ->sequence_number)
|
|
|
|
occ->sequence_number = 1;
|
|
|
|
checksum += seq_no;
|
|
|
|
|
|
|
|
rc = occ_putsram(occ, request, req_len, seq_no, checksum);
|
2018-11-08 21:05:21 +00:00
|
|
|
if (rc)
|
|
|
|
goto done;
|
|
|
|
|
|
|
|
rc = occ_trigger_attn(occ);
|
|
|
|
if (rc)
|
|
|
|
goto done;
|
|
|
|
|
2022-02-08 15:22:35 +00:00
|
|
|
end = jiffies + timeout;
|
|
|
|
while (true) {
|
|
|
|
/* Read occ response header */
|
2020-11-20 01:03:14 +00:00
|
|
|
rc = occ_getsram(occ, 0, resp, 8);
|
2018-11-08 21:05:21 +00:00
|
|
|
if (rc)
|
|
|
|
goto done;
|
|
|
|
|
2022-02-08 15:22:35 +00:00
|
|
|
if (fsi_occ_response_not_ready(resp, seq_no, cmd_type)) {
|
|
|
|
if (time_after(jiffies, end)) {
|
|
|
|
dev_err(occ->dev,
|
|
|
|
"resp timeout status=%02x seq=%d cmd=%d, our seq=%d cmd=%d\n",
|
2019-07-02 15:47:42 +00:00
|
|
|
resp->return_status, resp->seq_no,
|
2022-02-08 15:22:35 +00:00
|
|
|
resp->cmd_type, seq_no, cmd_type);
|
|
|
|
rc = -ETIMEDOUT;
|
2019-07-02 15:47:42 +00:00
|
|
|
goto done;
|
|
|
|
}
|
2018-11-08 21:05:21 +00:00
|
|
|
|
|
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
|
|
schedule_timeout(wait_time);
|
2022-02-08 15:22:35 +00:00
|
|
|
} else {
|
|
|
|
/* Extract size of response data */
|
|
|
|
resp_data_length =
|
|
|
|
get_unaligned_be16(&resp->data_length);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Message size is data length + 5 bytes header + 2
|
|
|
|
* bytes checksum
|
|
|
|
*/
|
|
|
|
if ((resp_data_length + 7) > user_resp_len) {
|
|
|
|
rc = -EMSGSIZE;
|
|
|
|
goto done;
|
|
|
|
}
|
2018-11-08 21:05:21 +00:00
|
|
|
|
2022-02-08 15:22:35 +00:00
|
|
|
/*
|
|
|
|
* Get the entire response including the header again,
|
|
|
|
* in case it changed
|
|
|
|
*/
|
|
|
|
if (resp_data_length > 1) {
|
|
|
|
rc = occ_getsram(occ, 0, resp,
|
|
|
|
resp_data_length + 7);
|
|
|
|
if (rc)
|
|
|
|
goto done;
|
|
|
|
|
|
|
|
if (!fsi_occ_response_not_ready(resp, seq_no,
|
|
|
|
cmd_type))
|
|
|
|
break;
|
|
|
|
} else {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2018-11-08 21:05:21 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
dev_dbg(dev, "resp_status=%02x resp_data_len=%d\n",
|
|
|
|
resp->return_status, resp_data_length);
|
|
|
|
|
2021-10-19 20:53:05 +00:00
|
|
|
occ->client_response_size = resp_data_length + 7;
|
2021-02-09 17:12:33 +00:00
|
|
|
rc = occ_verify_checksum(occ, resp, resp_data_length);
|
2018-11-08 21:05:21 +00:00
|
|
|
|
|
|
|
done:
|
2021-10-19 20:53:05 +00:00
|
|
|
*resp_len = occ->client_response_size;
|
2018-11-08 21:05:21 +00:00
|
|
|
mutex_unlock(&occ->occ_lock);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(fsi_occ_submit);
|
|
|
|
|
|
|
|
static int occ_unregister_child(struct device *dev, void *data)
|
|
|
|
{
|
|
|
|
struct platform_device *hwmon_dev = to_platform_device(dev);
|
|
|
|
|
|
|
|
platform_device_unregister(hwmon_dev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int occ_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
u32 reg;
|
|
|
|
struct occ *occ;
|
|
|
|
struct platform_device *hwmon_dev;
|
|
|
|
struct device *dev = &pdev->dev;
|
|
|
|
struct platform_device_info hwmon_dev_info = {
|
|
|
|
.parent = dev,
|
|
|
|
.name = "occ-hwmon",
|
|
|
|
};
|
|
|
|
|
|
|
|
occ = devm_kzalloc(dev, sizeof(*occ), GFP_KERNEL);
|
|
|
|
if (!occ)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2021-10-19 20:53:04 +00:00
|
|
|
/* SBE words are always four bytes */
|
|
|
|
occ->buffer = kvmalloc(OCC_MAX_RESP_WORDS * 4, GFP_KERNEL);
|
|
|
|
if (!occ->buffer)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2020-11-20 01:03:14 +00:00
|
|
|
occ->version = (uintptr_t)of_device_get_match_data(dev);
|
2018-11-08 21:05:21 +00:00
|
|
|
occ->dev = dev;
|
|
|
|
occ->sbefifo = dev->parent;
|
2022-02-08 15:22:35 +00:00
|
|
|
/*
|
|
|
|
* Quickly derive a pseudo-random number from jiffies so that
|
|
|
|
* re-probing the driver doesn't accidentally overlap sequence numbers.
|
|
|
|
*/
|
|
|
|
occ->sequence_number = (u8)((jiffies % 0xff) + 1);
|
2018-11-08 21:05:21 +00:00
|
|
|
mutex_init(&occ->occ_lock);
|
|
|
|
|
|
|
|
if (dev->of_node) {
|
|
|
|
rc = of_property_read_u32(dev->of_node, "reg", ®);
|
|
|
|
if (!rc) {
|
|
|
|
/* make sure we don't have a duplicate from dts */
|
|
|
|
occ->idx = ida_simple_get(&occ_ida, reg, reg + 1,
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (occ->idx < 0)
|
|
|
|
occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX,
|
|
|
|
GFP_KERNEL);
|
|
|
|
} else {
|
|
|
|
occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX,
|
|
|
|
GFP_KERNEL);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
occ->idx = ida_simple_get(&occ_ida, 1, INT_MAX, GFP_KERNEL);
|
|
|
|
}
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, occ);
|
|
|
|
|
|
|
|
snprintf(occ->name, sizeof(occ->name), "occ%d", occ->idx);
|
|
|
|
occ->mdev.fops = &occ_fops;
|
|
|
|
occ->mdev.minor = MISC_DYNAMIC_MINOR;
|
|
|
|
occ->mdev.name = occ->name;
|
|
|
|
occ->mdev.parent = dev;
|
|
|
|
|
|
|
|
rc = misc_register(&occ->mdev);
|
|
|
|
if (rc) {
|
|
|
|
dev_err(dev, "failed to register miscdevice: %d\n", rc);
|
|
|
|
ida_simple_remove(&occ_ida, occ->idx);
|
2021-10-19 20:53:04 +00:00
|
|
|
kvfree(occ->buffer);
|
2018-11-08 21:05:21 +00:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
hwmon_dev_info.id = occ->idx;
|
|
|
|
hwmon_dev = platform_device_register_full(&hwmon_dev_info);
|
2020-07-13 03:33:13 +00:00
|
|
|
if (IS_ERR(hwmon_dev))
|
2018-11-08 21:05:21 +00:00
|
|
|
dev_warn(dev, "failed to create hwmon device\n");
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int occ_remove(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct occ *occ = platform_get_drvdata(pdev);
|
|
|
|
|
2021-10-19 20:53:04 +00:00
|
|
|
kvfree(occ->buffer);
|
|
|
|
|
2018-11-08 21:05:21 +00:00
|
|
|
misc_deregister(&occ->mdev);
|
|
|
|
|
|
|
|
device_for_each_child(&pdev->dev, NULL, occ_unregister_child);
|
|
|
|
|
|
|
|
ida_simple_remove(&occ_ida, occ->idx);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct of_device_id occ_match[] = {
|
2020-11-20 01:03:14 +00:00
|
|
|
{
|
|
|
|
.compatible = "ibm,p9-occ",
|
|
|
|
.data = (void *)occ_p9
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.compatible = "ibm,p10-occ",
|
|
|
|
.data = (void *)occ_p10
|
|
|
|
},
|
2018-11-08 21:05:21 +00:00
|
|
|
{ },
|
|
|
|
};
|
2021-05-13 08:57:29 +00:00
|
|
|
MODULE_DEVICE_TABLE(of, occ_match);
|
2018-11-08 21:05:21 +00:00
|
|
|
|
|
|
|
static struct platform_driver occ_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "occ",
|
|
|
|
.of_match_table = occ_match,
|
|
|
|
},
|
|
|
|
.probe = occ_probe,
|
|
|
|
.remove = occ_remove,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int occ_init(void)
|
|
|
|
{
|
|
|
|
return platform_driver_register(&occ_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void occ_exit(void)
|
|
|
|
{
|
|
|
|
platform_driver_unregister(&occ_driver);
|
|
|
|
|
|
|
|
ida_destroy(&occ_ida);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(occ_init);
|
|
|
|
module_exit(occ_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>");
|
|
|
|
MODULE_DESCRIPTION("BMC P9 OCC driver");
|
|
|
|
MODULE_LICENSE("GPL");
|