303 lines
6.8 KiB
C
303 lines
6.8 KiB
C
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/*
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* DSPG DBMD4/DBMD6/DBMD8 I2C interface driver
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*
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* Copyright (C) 2014 DSP Group
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/* #define DEBUG */
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/firmware.h>
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#include "dbmdx-interface.h"
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#include "dbmdx-va-regmap.h"
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#include "dbmdx-i2c.h"
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#define DRIVER_VERSION "1.0"
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static const u8 clr_crc_cmd[] = {0x5A, 0x0F};
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static int dbmd4_i2c_boot(const void *fw_data, size_t fw_size,
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struct dbmdx_private *p, const void *checksum,
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size_t chksum_len, int load_fw)
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{
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int retry = RETRY_COUNT;
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int ret = 0;
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ssize_t send_bytes;
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struct dbmdx_i2c_private *i2c_p =
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(struct dbmdx_i2c_private *)p->chip->pdata;
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dev_dbg(i2c_p->dev, "%s\n", __func__);
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/* change to boot I2C address */
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i2c_p->client->addr = (unsigned short)(i2c_p->pdata->boot_addr);
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do {
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if (p->active_fw == DBMDX_FW_PRE_BOOT) {
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if (!(p->boot_mode & DBMDX_BOOT_MODE_RESET_DISABLED)) {
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/* reset DBMD4 chip */
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p->reset_sequence(p);
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} else {
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/* If failed and reset is disabled, break */
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if (retry != RETRY_COUNT) {
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retry = -1;
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break;
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}
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}
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/* delay before sending commands */
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if (p->clk_get_rate(p, DBMDX_CLK_MASTER) <= 32768)
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msleep(DBMDX_MSLEEP_I2C_D4_AFTER_RESET_32K);
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else
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usleep_range(DBMDX_USLEEP_I2C_D4_AFTER_RESET,
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DBMDX_USLEEP_I2C_D4_AFTER_RESET + 5000);
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/* verify chip id */
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if (p->cur_boot_options &
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DBMDX_BOOT_OPT_VERIFY_CHIP_ID) {
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ret = i2c_verify_chip_id(p);
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if (ret < 0) {
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dev_err(i2c_p->dev,
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"%s: couldn't verify chip id\n",
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__func__);
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continue;
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}
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}
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if (!(p->cur_boot_options &
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DBMDX_BOOT_OPT_DONT_CLR_CRC)) {
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/* send CRC clear command */
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ret = write_i2c_data(p, clr_crc_cmd,
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sizeof(clr_crc_cmd));
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if (ret != sizeof(clr_crc_cmd)) {
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dev_err(p->dev,
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"%s: failed to clear CRC\n",
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__func__);
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continue;
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}
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}
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} else {
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ret = send_i2c_cmd_va(p,
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DBMDX_VA_SWITCH_TO_BOOT,
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NULL);
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if (ret < 0) {
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dev_err(p->dev,
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"%s: failed to send 'Switch to BOOT' cmd\n",
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__func__);
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continue;
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}
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}
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if (!load_fw)
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break;
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/* Sleep is needed here to ensure that chip is ready */
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msleep(DBMDX_MSLEEP_I2C_D4_AFTER_SBL);
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/* send firmware */
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send_bytes = write_i2c_data(p, fw_data, fw_size - 4);
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if (send_bytes != fw_size - 4) {
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dev_err(p->dev,
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"%s: -----------> load firmware error\n",
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__func__);
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continue;
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}
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msleep(DBMDX_MSLEEP_I2C_D4_BEFORE_FW_CHECKSUM);
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/* verify checksum */
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if (checksum && !(p->cur_boot_options &
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DBMDX_BOOT_OPT_DONT_VERIFY_CRC)) {
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ret = i2c_verify_boot_checksum(p, checksum, chksum_len);
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if (ret < 0) {
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dev_err(i2c_p->dev,
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"%s: could not verify checksum\n",
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__func__);
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continue;
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}
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}
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dev_info(p->dev, "%s: ---------> firmware loaded\n",
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__func__);
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break;
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} while (--retry);
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/* no retries left, failed to boot */
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if (retry <= 0) {
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dev_err(p->dev, "%s: failed to load firmware\n", __func__);
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return -EIO;
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}
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if (!(p->cur_boot_options & DBMDX_BOOT_OPT_DONT_SEND_START_BOOT)) {
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/* send boot command */
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ret = send_i2c_cmd_boot(p, DBMDX_FIRMWARE_BOOT);
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if (ret < 0) {
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dev_err(p->dev,
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"%s: booting the firmware failed\n", __func__);
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return -EIO;
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}
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}
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/* wait some time */
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usleep_range(DBMDX_USLEEP_I2C_D4_AFTER_BOOT,
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DBMDX_USLEEP_I2C_D4_AFTER_BOOT + 1000);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int dbmdx_i2c_suspend(struct device *dev)
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{
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struct chip_interface *ci = i2c_get_clientdata(to_i2c_client(dev));
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struct dbmdx_i2c_private *i2c_p =
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(struct dbmdx_i2c_private *)ci->pdata;
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dev_dbg(dev, "%s\n", __func__);
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i2c_interface_suspend(i2c_p);
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return 0;
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}
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static int dbmdx_i2c_resume(struct device *dev)
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{
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struct chip_interface *ci = i2c_get_clientdata(to_i2c_client(dev));
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struct dbmdx_i2c_private *i2c_p =
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(struct dbmdx_i2c_private *)ci->pdata;
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dev_dbg(dev, "%s\n", __func__);
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i2c_interface_resume(i2c_p);
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return 0;
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}
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#else
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#define dbmdx_i2c_suspend NULL
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#define dbmdx_i2c_resume NULL
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_PM
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static int dbmdx_i2c_runtime_suspend(struct device *dev)
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{
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struct chip_interface *ci = i2c_get_clientdata(to_i2c_client(dev));
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struct dbmdx_i2c_private *i2c_p =
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(struct dbmdx_i2c_private *)ci->pdata;
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dev_dbg(dev, "%s\n", __func__);
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i2c_interface_suspend(i2c_p);
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return 0;
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}
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static int dbmdx_i2c_runtime_resume(struct device *dev)
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{
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struct chip_interface *ci = i2c_get_clientdata(to_i2c_client(dev));
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struct dbmdx_i2c_private *i2c_p =
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(struct dbmdx_i2c_private *)ci->pdata;
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dev_dbg(dev, "%s\n", __func__);
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i2c_interface_resume(i2c_p);
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return 0;
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}
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#else
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#define dbmdx_i2c_runtime_suspend NULL
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#define dbmdx_i2c_runtime_resume NULL
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#endif /* CONFIG_PM */
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static const struct dev_pm_ops dbmdx_i2c_pm = {
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SET_SYSTEM_SLEEP_PM_OPS(dbmdx_i2c_suspend, dbmdx_i2c_resume)
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SET_RUNTIME_PM_OPS(dbmdx_i2c_runtime_suspend,
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dbmdx_i2c_runtime_resume, NULL)
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};
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static int dbmd4_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int rc;
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struct dbmdx_i2c_private *p;
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struct chip_interface *ci;
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rc = i2c_common_probe(client, id);
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if (rc < 0)
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return rc;
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ci = i2c_get_clientdata(client);
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p = (struct dbmdx_i2c_private *)ci->pdata;
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/* fill in chip interface functions */
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p->chip.boot = dbmd4_i2c_boot;
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return rc;
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}
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static const struct of_device_id dbmd_4_8_i2c_of_match[] = {
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{ .compatible = "dspg,dbmd4-i2c", },
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{ .compatible = "dspg,dbmd6-i2c", },
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{ .compatible = "dspg,dbmd8-i2c", },
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{},
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};
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MODULE_DEVICE_TABLE(of, dbmd_4_8_i2c_of_match);
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static const struct i2c_device_id dbmd_4_8_i2c_id[] = {
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{ "dbmdx-i2c", 0 },
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{ "dbmd4-i2c", 0 },
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{ "dbmd6-i2c", 0 },
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{ "dbmd8-i2c", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, dbmd_4_8_i2c_id);
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static struct i2c_driver dbmd_4_8_i2c_driver = {
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.driver = {
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.name = "dbmd_4_8-i2c",
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.owner = THIS_MODULE,
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#ifdef CONFIG_OF
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.of_match_table = dbmd_4_8_i2c_of_match,
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#endif
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.pm = &dbmdx_i2c_pm,
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},
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.probe = dbmd4_i2c_probe,
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.remove = i2c_common_remove,
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.id_table = dbmd_4_8_i2c_id,
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};
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static int __init dbmd_4_8_modinit(void)
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{
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return i2c_add_driver(&dbmd_4_8_i2c_driver);
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}
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module_init(dbmd_4_8_modinit);
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static void __exit dbmd_4_8_exit(void)
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{
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i2c_del_driver(&dbmd_4_8_i2c_driver);
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}
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module_exit(dbmd_4_8_exit);
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MODULE_DESCRIPTION("DSPG DBMD4/DBMD6/DBMD8 I2C interface driver");
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MODULE_LICENSE("GPL");
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