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/*
* Copyright (c) 2006-2013, Cypress Semiconductor Corporation
* All rights reserved.
*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/ihex.h>
#include <linux/gpio.h>
#include "issp_priv.h"
#define DRIVER_NAME "issp"
static int issp_check_fw(struct issp_host *host)
{
const struct ihex_binrec *rec;
int checks = 0;
int size;
size = host->pdata->block_size * host->pdata->blocks;
rec = (const struct ihex_binrec *)host->fw->data;
while (rec) {
int addr, len;
addr = be32_to_cpu(rec->addr);
len = be16_to_cpu(rec->len);
if (addr + len == size)
checks++;
if (addr == ISSP_FW_SECURITY_ADDR) {
host->security_rec = rec;
checks++;
}
if (addr == ISSP_FW_CHECKSUM_ADDR) {
host->checksum_fw = rec->data[0] << 8 | rec->data[1];
checks++;
}
if (host->pdata->version_addr > addr &&
host->pdata->version_addr < addr + len) {
host->version_fw =
rec->data[host->pdata->version_addr - addr];
checks++;
}
if (checks == 4)
break;
rec = ihex_next_binrec(rec);
}
if (checks < 4)
return -EINVAL;
else
return 0;
}
void issp_fw_rewind(struct issp_host *host)
{
host->cur_rec = (const struct ihex_binrec *)host->fw->data;
host->cur_idx = 0;
}
void issp_fw_seek_security(struct issp_host *host)
{
host->cur_rec = host->security_rec;
host->cur_idx = 0;
}
uint8_t issp_fw_get_byte(struct issp_host *host)
{
uint8_t byte;
byte = host->cur_rec->data[host->cur_idx];
host->cur_idx++;
if (host->cur_idx >= be16_to_cpu(host->cur_rec->len)) {
host->cur_rec = ihex_next_binrec(host->cur_rec);
host->cur_idx = 0;
}
return byte;
}
static int issp_need_update(struct issp_host *host, bool *update)
{
uint8_t idx, addr, ver_uc;
int ret;
idx = host->pdata->version_addr / host->pdata->block_size;
addr = host->pdata->version_addr - idx * host->pdata->block_size;
ret = issp_read_block(host, idx, addr, &ver_uc, 1);
if (ret == -EACCES) {
dev_err(&host->pdev->dev,
"Version Block is protected, force upgrade!\n");
*update = true;
} else if (ret == 1) {
*update = (ver_uc < host->version_fw) ||
((ver_uc != host->version_fw) &&
host->pdata->force_update);
if (*update)
dev_info(&host->pdev->dev, "firmware needs upgrade, "\
"version 0x%02x -> 0x%02x\n",
ver_uc, host->version_fw);
else
dev_info(&host->pdev->dev,
"firmware version %02x is latest!\n", ver_uc);
} else
return ret;
return 0;
}
static int __init issp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct issp_platform_data *pdata = dev->platform_data;
struct issp_host *host;
bool update;
int ret;
if (!pdata || !gpio_is_valid(pdata->reset_gpio)
|| !gpio_is_valid(pdata->data_gpio)
|| !gpio_is_valid(pdata->clk_gpio)) {
dev_err(dev, "Invalid platform data!");
return -EINVAL;
}
ret = devm_gpio_request(dev, pdata->reset_gpio, "issp reset");
if (!ret)
ret = devm_gpio_request(dev, pdata->data_gpio, "issp data");
if (!ret)
ret = devm_gpio_request(dev, pdata->clk_gpio, "issp clock");
if (ret)
return ret;
/* set gpio directions */
gpio_direction_output(pdata->reset_gpio, 0);
gpio_direction_input(pdata->data_gpio);
gpio_direction_output(pdata->clk_gpio, 0);
host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
host->pdev = pdev;
host->pdata = pdata;
ret = request_ihex_firmware(&host->fw, pdata->fw_name, dev);
if (ret) {
dev_err(dev, "Request firmware %s failed!\n", pdata->fw_name);
return ret;
}
ret = issp_check_fw(host);
if (ret) {
dev_err(dev, "Firmware %s invalid!\n", pdata->fw_name);
goto err;
}
issp_uc_program(host);
if (host->si_id[0] != pdata->si_id[0] ||
host->si_id[1] != pdata->si_id[1] ||
host->si_id[2] != pdata->si_id[2] ||
host->si_id[3] != pdata->si_id[3]) {
dev_err(dev, "Sillicon ID check failed!\n");
goto err_id;
}
ret = issp_need_update(host, &update);
if (ret)
goto err_id;
if (update) {
ret = issp_program(host);
if (!ret)
dev_info(dev, "Firmware update successfully!\n");
else
dev_err(dev, "Firmware update failed!\n");
}
err_id:
issp_uc_run(host);
err:
gpio_direction_input(pdata->data_gpio);
gpio_direction_input(pdata->clk_gpio);
release_firmware(host->fw);
devm_kfree(dev, host);
return 0;
}
static int __exit issp_remove(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver issp_driver = {
.remove = __exit_p(issp_remove),
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
}
};
static int __init issp_init(void)
{
return platform_driver_probe(&issp_driver, issp_probe);
}
subsys_initcall(issp_init);
static void __exit issp_exit(void)
{
platform_driver_unregister(&issp_driver);
}
module_exit(issp_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Richard Zhao, nVidia <rizhao@nvidia.com>");
MODULE_DESCRIPTION("ISSP driver");
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