/* * DSPG DBMD4/DBMD6/DBMD8 I2C interface driver * * Copyright (C) 2014 DSP Group * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that 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. */ /* #define DEBUG */ #include #include #include #include #include #include #include #include #include #include "dbmdx-interface.h" #include "dbmdx-va-regmap.h" #include "dbmdx-i2c.h" #define DRIVER_VERSION "1.0" static const u8 clr_crc_cmd[] = {0x5A, 0x0F}; static int dbmd4_i2c_boot(const void *fw_data, size_t fw_size, struct dbmdx_private *p, const void *checksum, size_t chksum_len, int load_fw) { int retry = RETRY_COUNT; int ret = 0; ssize_t send_bytes; struct dbmdx_i2c_private *i2c_p = (struct dbmdx_i2c_private *)p->chip->pdata; dev_dbg(i2c_p->dev, "%s\n", __func__); /* change to boot I2C address */ i2c_p->client->addr = (unsigned short)(i2c_p->pdata->boot_addr); do { if (p->active_fw == DBMDX_FW_PRE_BOOT) { if (!(p->boot_mode & DBMDX_BOOT_MODE_RESET_DISABLED)) { /* reset DBMD4 chip */ p->reset_sequence(p); } else { /* If failed and reset is disabled, break */ if (retry != RETRY_COUNT) { retry = -1; break; } } /* delay before sending commands */ if (p->clk_get_rate(p, DBMDX_CLK_MASTER) <= 32768) msleep(DBMDX_MSLEEP_I2C_D4_AFTER_RESET_32K); else usleep_range(DBMDX_USLEEP_I2C_D4_AFTER_RESET, DBMDX_USLEEP_I2C_D4_AFTER_RESET + 5000); /* verify chip id */ if (p->cur_boot_options & DBMDX_BOOT_OPT_VERIFY_CHIP_ID) { ret = i2c_verify_chip_id(p); if (ret < 0) { dev_err(i2c_p->dev, "%s: couldn't verify chip id\n", __func__); continue; } } if (!(p->cur_boot_options & DBMDX_BOOT_OPT_DONT_CLR_CRC)) { /* send CRC clear command */ ret = write_i2c_data(p, clr_crc_cmd, sizeof(clr_crc_cmd)); if (ret != sizeof(clr_crc_cmd)) { dev_err(p->dev, "%s: failed to clear CRC\n", __func__); continue; } } } else { ret = send_i2c_cmd_va(p, DBMDX_VA_SWITCH_TO_BOOT, NULL); if (ret < 0) { dev_err(p->dev, "%s: failed to send 'Switch to BOOT' cmd\n", __func__); continue; } } if (!load_fw) break; /* Sleep is needed here to ensure that chip is ready */ msleep(DBMDX_MSLEEP_I2C_D4_AFTER_SBL); /* send firmware */ send_bytes = write_i2c_data(p, fw_data, fw_size - 4); if (send_bytes != fw_size - 4) { dev_err(p->dev, "%s: -----------> load firmware error\n", __func__); continue; } msleep(DBMDX_MSLEEP_I2C_D4_BEFORE_FW_CHECKSUM); /* verify checksum */ if (checksum && !(p->cur_boot_options & DBMDX_BOOT_OPT_DONT_VERIFY_CRC)) { ret = i2c_verify_boot_checksum(p, checksum, chksum_len); if (ret < 0) { dev_err(i2c_p->dev, "%s: could not verify checksum\n", __func__); continue; } } dev_info(p->dev, "%s: ---------> firmware loaded\n", __func__); break; } while (--retry); /* no retries left, failed to boot */ if (retry <= 0) { dev_err(p->dev, "%s: failed to load firmware\n", __func__); return -EIO; } if (!(p->cur_boot_options & DBMDX_BOOT_OPT_DONT_SEND_START_BOOT)) { /* send boot command */ ret = send_i2c_cmd_boot(p, DBMDX_FIRMWARE_BOOT); if (ret < 0) { dev_err(p->dev, "%s: booting the firmware failed\n", __func__); return -EIO; } } /* wait some time */ usleep_range(DBMDX_USLEEP_I2C_D4_AFTER_BOOT, DBMDX_USLEEP_I2C_D4_AFTER_BOOT + 1000); return 0; } #ifdef CONFIG_PM_SLEEP static int dbmdx_i2c_suspend(struct device *dev) { struct chip_interface *ci = i2c_get_clientdata(to_i2c_client(dev)); struct dbmdx_i2c_private *i2c_p = (struct dbmdx_i2c_private *)ci->pdata; dev_dbg(dev, "%s\n", __func__); i2c_interface_suspend(i2c_p); return 0; } static int dbmdx_i2c_resume(struct device *dev) { struct chip_interface *ci = i2c_get_clientdata(to_i2c_client(dev)); struct dbmdx_i2c_private *i2c_p = (struct dbmdx_i2c_private *)ci->pdata; dev_dbg(dev, "%s\n", __func__); i2c_interface_resume(i2c_p); return 0; } #else #define dbmdx_i2c_suspend NULL #define dbmdx_i2c_resume NULL #endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_PM static int dbmdx_i2c_runtime_suspend(struct device *dev) { struct chip_interface *ci = i2c_get_clientdata(to_i2c_client(dev)); struct dbmdx_i2c_private *i2c_p = (struct dbmdx_i2c_private *)ci->pdata; dev_dbg(dev, "%s\n", __func__); i2c_interface_suspend(i2c_p); return 0; } static int dbmdx_i2c_runtime_resume(struct device *dev) { struct chip_interface *ci = i2c_get_clientdata(to_i2c_client(dev)); struct dbmdx_i2c_private *i2c_p = (struct dbmdx_i2c_private *)ci->pdata; dev_dbg(dev, "%s\n", __func__); i2c_interface_resume(i2c_p); return 0; } #else #define dbmdx_i2c_runtime_suspend NULL #define dbmdx_i2c_runtime_resume NULL #endif /* CONFIG_PM */ static const struct dev_pm_ops dbmdx_i2c_pm = { SET_SYSTEM_SLEEP_PM_OPS(dbmdx_i2c_suspend, dbmdx_i2c_resume) SET_RUNTIME_PM_OPS(dbmdx_i2c_runtime_suspend, dbmdx_i2c_runtime_resume, NULL) }; static int dbmd4_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { int rc; struct dbmdx_i2c_private *p; struct chip_interface *ci; rc = i2c_common_probe(client, id); if (rc < 0) return rc; ci = i2c_get_clientdata(client); p = (struct dbmdx_i2c_private *)ci->pdata; /* fill in chip interface functions */ p->chip.boot = dbmd4_i2c_boot; return rc; } static const struct of_device_id dbmd_4_8_i2c_of_match[] = { { .compatible = "dspg,dbmd4-i2c", }, { .compatible = "dspg,dbmd6-i2c", }, { .compatible = "dspg,dbmd8-i2c", }, {}, }; MODULE_DEVICE_TABLE(of, dbmd_4_8_i2c_of_match); static const struct i2c_device_id dbmd_4_8_i2c_id[] = { { "dbmdx-i2c", 0 }, { "dbmd4-i2c", 0 }, { "dbmd6-i2c", 0 }, { "dbmd8-i2c", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, dbmd_4_8_i2c_id); static struct i2c_driver dbmd_4_8_i2c_driver = { .driver = { .name = "dbmd_4_8-i2c", .owner = THIS_MODULE, #ifdef CONFIG_OF .of_match_table = dbmd_4_8_i2c_of_match, #endif .pm = &dbmdx_i2c_pm, }, .probe = dbmd4_i2c_probe, .remove = i2c_common_remove, .id_table = dbmd_4_8_i2c_id, }; static int __init dbmd_4_8_modinit(void) { return i2c_add_driver(&dbmd_4_8_i2c_driver); } module_init(dbmd_4_8_modinit); static void __exit dbmd_4_8_exit(void) { i2c_del_driver(&dbmd_4_8_i2c_driver); } module_exit(dbmd_4_8_exit); MODULE_DESCRIPTION("DSPG DBMD4/DBMD6/DBMD8 I2C interface driver"); MODULE_LICENSE("GPL");