283 lines
6.3 KiB
C
283 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 MediaTek Inc.
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* Author: Sagy Shih <sagy.shih@mediatek.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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#include <memory/mediatek/emi.h>
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static struct platform_device *emiisu_pdev;
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static int emiisu_probe(struct platform_device *pdev);
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static ssize_t emiisu_ctrl_show(struct device_driver *driver, char *buf)
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{
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struct emiisu_dev_t *emiisu_dev_ptr;
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unsigned int state;
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if (!emiisu_pdev)
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return 0;
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emiisu_dev_ptr =
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(struct emiisu_dev_t *)platform_get_drvdata(emiisu_pdev);
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if (!(emiisu_dev_ptr->con_addr))
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return 0;
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state = readl(emiisu_dev_ptr->con_addr);
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return snprintf(buf, PAGE_SIZE, "isu_state: 0x%x\n", state);
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}
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static ssize_t emiisu_ctrl_store
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(struct device_driver *driver, const char *buf, size_t count)
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{
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struct emiisu_dev_t *emiisu_dev_ptr;
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unsigned long state;
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char *command;
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char *backup_command;
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char *ptr;
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char *token[MTK_EMI_MAX_TOKEN];
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int i;
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if (!emiisu_pdev)
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return count;
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emiisu_dev_ptr =
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(struct emiisu_dev_t *)platform_get_drvdata(emiisu_pdev);
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if (!(emiisu_dev_ptr->ctrl_intf))
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return count;
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if (!(emiisu_dev_ptr->con_addr))
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return count;
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if ((strlen(buf) + 1) > MTK_EMI_MAX_CMD_LEN) {
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pr_info("%s: store command overflow\n", __func__);
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return count;
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}
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command = kmalloc((size_t)MTK_EMI_MAX_CMD_LEN, GFP_KERNEL);
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if (!command)
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return count;
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backup_command = command;
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strncpy(command, buf, (size_t)MTK_EMI_MAX_CMD_LEN);
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for (i = 0; i < MTK_EMI_MAX_TOKEN; i++) {
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ptr = strsep(&command, " ");
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if (!ptr)
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break;
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token[i] = ptr;
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}
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if (i < 1)
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goto emiisu_ctrl_store_end;
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if (kstrtoul(token[0], 16, &state) == 0)
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writel((unsigned int)state, emiisu_dev_ptr->con_addr);
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emiisu_ctrl_store_end:
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kfree(backup_command);
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return count;
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}
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static DRIVER_ATTR_RW(emiisu_ctrl);
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static ssize_t dump_buf_read
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(struct file *file, char __user *data, size_t len, loff_t *ppos)
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{
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struct emiisu_dev_t *emiisu_dev_ptr;
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ssize_t bytes;
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ssize_t header_bytes = 0;
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if (!emiisu_pdev)
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return 0;
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emiisu_dev_ptr =
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(struct emiisu_dev_t *)platform_get_drvdata(emiisu_pdev);
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bytes = len < (emiisu_dev_ptr->buf_size - *ppos) ?
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len : (emiisu_dev_ptr->buf_size - *ppos);
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if (!(emiisu_dev_ptr->buf_addr))
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return 0;
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if (!(emiisu_dev_ptr->ver_addr))
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return 0;
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if (*ppos == 0) {
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if (copy_to_user(data, (char *)(emiisu_dev_ptr->ver_addr), 4)
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|| (bytes < 4))
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return -EFAULT;
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data += 4;
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header_bytes += 4;
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bytes -= 4;
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}
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if (bytes) {
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if (copy_to_user(data, (char *)(emiisu_dev_ptr->buf_addr) +
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*ppos, bytes))
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return -EFAULT;
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}
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*ppos += bytes;
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return (bytes + header_bytes);
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}
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static int dump_buf_open(struct inode *inode, struct file *file)
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{
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return nonseekable_open(inode, file);
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}
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static const struct file_operations dump_buf_fops = {
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.owner = THIS_MODULE,
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.read = dump_buf_read,
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.open = dump_buf_open
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};
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static int emiisu_remove(struct platform_device *dev)
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{
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return 0;
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}
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static const struct of_device_id emiisu_of_ids[] = {
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{.compatible = "mediatek,common-emiisu",},
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{}
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};
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static struct platform_driver emiisu_drv = {
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.probe = emiisu_probe,
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.remove = emiisu_remove,
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.driver = {
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.name = "emiisu_drv",
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.owner = THIS_MODULE,
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.of_match_table = emiisu_of_ids,
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},
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};
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static int emiisu_probe(struct platform_device *pdev)
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{
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struct device_node *emiisu_node = pdev->dev.of_node;
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struct emiisu_dev_t *emiisu_dev_ptr;
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unsigned long long addr_temp;
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int ret;
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pr_info("%s: module probe.\n", __func__);
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emiisu_pdev = pdev;
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emiisu_dev_ptr = devm_kmalloc(&pdev->dev,
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sizeof(struct emiisu_dev_t), GFP_KERNEL);
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if (!emiisu_dev_ptr)
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return -ENOMEM;
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ret = of_property_read_u32(emiisu_node,
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"buf_size", &(emiisu_dev_ptr->buf_size));
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if (ret) {
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pr_info("%s: get buf_size fail\n", __func__);
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return -EINVAL;
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}
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ret = of_property_read_u64(emiisu_node, "buf_addr", &addr_temp);
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if (ret) {
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pr_info("%s: get buf_addr fail\n", __func__);
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return -EINVAL;
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}
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if (addr_temp)
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emiisu_dev_ptr->buf_addr = ioremap_wc(
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(phys_addr_t)addr_temp, emiisu_dev_ptr->buf_size);
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else
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emiisu_dev_ptr->buf_addr = NULL;
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ret = of_property_read_u64(emiisu_node, "ver_addr", &addr_temp);
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if (ret) {
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pr_info("%s: get ver_addr fail\n", __func__);
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return -EINVAL;
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}
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if (addr_temp)
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emiisu_dev_ptr->ver_addr = ioremap((phys_addr_t)addr_temp, 4);
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else
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emiisu_dev_ptr->ver_addr = NULL;
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ret = of_property_read_u64(emiisu_node, "con_addr", &addr_temp);
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if (ret) {
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pr_info("%s: get con_addr fail\n", __func__);
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return -EINVAL;
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}
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if (addr_temp)
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emiisu_dev_ptr->con_addr = ioremap((phys_addr_t)addr_temp, 4);
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else
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emiisu_dev_ptr->con_addr = NULL;
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ret = of_property_read_u32(emiisu_node,
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"ctrl_intf", &(emiisu_dev_ptr->ctrl_intf));
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if (ret) {
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pr_info("%s: get ctrl_intf fail\n", __func__);
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return -EINVAL;
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}
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pr_info("%s: %s(%x),%s(%lx),%s(%lx),%s(%lx),%s(%d)\n", __func__,
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"buf_size", emiisu_dev_ptr->buf_size,
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"buf_addr", (unsigned long)(emiisu_dev_ptr->buf_addr),
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"ver_addr", (unsigned long)(emiisu_dev_ptr->ver_addr),
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"con_addr", (unsigned long)(emiisu_dev_ptr->con_addr),
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"ctrl_intf", emiisu_dev_ptr->ctrl_intf);
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emiisu_dev_ptr->dump_dir = debugfs_create_dir("emi_mbw", NULL);
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if (!emiisu_dev_ptr->dump_dir) {
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pr_info("%s: fail to create dump_dir\n", __func__);
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return -EINVAL;
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}
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emiisu_dev_ptr->dump_buf = debugfs_create_file("dump_buf", 0444,
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emiisu_dev_ptr->dump_dir, NULL, &dump_buf_fops);
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if (!emiisu_dev_ptr->dump_buf) {
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pr_info("%s: fail to create dump_buf\n", __func__);
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return -EINVAL;
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}
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platform_set_drvdata(pdev, emiisu_dev_ptr);
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ret = driver_create_file(&emiisu_drv.driver,
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&driver_attr_emiisu_ctrl);
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if (ret)
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pr_info("%s: fail to create emiisu_ctrl\n", __func__);
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return ret;
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}
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static int __init emiisu_drv_init(void)
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{
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int ret;
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ret = platform_driver_register(&emiisu_drv);
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if (ret) {
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pr_info("%s: init fail, ret 0x%x\n", __func__, ret);
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return ret;
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}
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return ret;
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}
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static void __exit emiisu_drv_exit(void)
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{
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platform_driver_unregister(&emiisu_drv);
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}
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module_init(emiisu_drv_init);
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module_exit(emiisu_drv_exit);
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MODULE_DESCRIPTION("MediaTek EMIISU Driver v0.1");
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