372 lines
8.7 KiB
C
372 lines
8.7 KiB
C
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/*
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* DSPG DBMD2 SPI 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/spi/spi.h>
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#include <linux/of_gpio.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-vqe-regmap.h"
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#include "dbmdx-spi.h"
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#define DBMD2_MAX_SPI_BOOT_SPEED 8000000
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static const u8 clr_crc[] = {0x5A, 0x03, 0x52, 0x0a, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00};
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static const u8 chng_pll_cmd[] = {0x5A, 0x13,
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0x3D, 0x10, 0x00, 0x00,
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0x00, 0x16, 0x00, 0x10,
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0xFF, 0xF1, 0x3F, 0x00};
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static int dbmd2_spi_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_spi_private *spi_p =
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(struct dbmdx_spi_private *)p->chip->pdata;
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struct spi_device *spi = spi_p->client;
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u8 sbl_spi[] = {
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0x5A, 0x04, 0x4c, 0x00, 0x00,
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0x03, 0x11, 0x55, 0x05, 0x00};
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dev_dbg(spi_p->dev, "%s\n", __func__);
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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 DBMD2 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_SPI_D2_AFTER_RESET_32K);
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else
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usleep_range(DBMDX_USLEEP_SPI_D2_AFTER_RESET,
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DBMDX_USLEEP_SPI_D2_AFTER_RESET + 5000);
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ret = spi_set_speed(p, DBMDX_VA_SPEED_MAX);
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if (ret < 0) {
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dev_err(spi_p->dev, "%s:failed %x\n",
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__func__, ret);
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continue;
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}
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if ((spi->max_speed_hz > DBMD2_MAX_SPI_BOOT_SPEED) &&
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!(p->cur_boot_options &
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DBMDX_BOOT_OPT_DONT_SET_PLL)) {
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ret = spi_set_speed(p, DBMDX_VA_SPEED_NORMAL);
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if (ret < 0) {
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dev_err(spi_p->dev, "%s:failed %x\n",
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__func__, ret);
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continue;
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}
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/* send Change PLL clear command */
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ret = send_spi_data(p, chng_pll_cmd,
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sizeof(chng_pll_cmd));
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if (ret != sizeof(chng_pll_cmd)) {
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dev_err(p->dev,
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"%s: failed to change PLL\n",
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__func__);
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continue;
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}
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msleep(DBMDX_MSLEEP_SPI_D2_AFTER_PLL_CHANGE);
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ret = spi_set_speed(p, DBMDX_VA_SPEED_MAX);
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if (ret < 0) {
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dev_err(spi_p->dev, "%s:failed %x\n",
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__func__, ret);
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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_SENT_SBL)) {
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/* send SBL */
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send_bytes = send_spi_data(p, sbl_spi,
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sizeof(sbl_spi));
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if (send_bytes != sizeof(sbl_spi)) {
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dev_err(p->dev,
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"%s: -----------> load SBL error\n",
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__func__);
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continue;
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}
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usleep_range(DBMDX_USLEEP_SPI_D2_AFTER_SBL,
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DBMDX_USLEEP_SPI_D2_AFTER_SBL + 1000);
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}
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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 = spi_verify_chip_id(p);
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if (ret < 0) {
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dev_err(spi_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 = send_spi_data(p, clr_crc,
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sizeof(clr_crc));
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if (ret != sizeof(clr_crc)) {
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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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/* delay before sending commands */
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if (p->active_fw == DBMDX_FW_VQE)
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ret = send_spi_cmd_vqe(p,
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DBMDX_VQE_SET_SWITCH_TO_BOOT_CMD,
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NULL);
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else if (p->active_fw == DBMDX_FW_VA)
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ret = send_spi_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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/* send firmware */
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send_bytes = send_spi_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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/* 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 = spi_verify_boot_checksum(p, checksum, chksum_len);
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if (ret < 0) {
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dev_err(spi_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_dbg(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_spi_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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ret = spi_set_speed(p, DBMDX_VA_SPEED_NORMAL);
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if (ret < 0)
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dev_err(spi_p->dev, "%s:failed %x\n", __func__, ret);
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/* wait some time */
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usleep_range(DBMDX_USLEEP_SPI_D2_AFTER_BOOT,
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DBMDX_USLEEP_SPI_D2_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_spi_suspend(struct device *dev)
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{
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struct chip_interface *ci = spi_get_drvdata(to_spi_device(dev));
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struct dbmdx_spi_private *spi_p = (struct dbmdx_spi_private *)ci->pdata;
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dev_dbg(dev, "%s\n", __func__);
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spi_interface_suspend(spi_p);
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return 0;
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}
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static int dbmdx_spi_resume(struct device *dev)
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{
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struct chip_interface *ci = spi_get_drvdata(to_spi_device(dev));
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struct dbmdx_spi_private *spi_p = (struct dbmdx_spi_private *)ci->pdata;
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dev_dbg(dev, "%s\n", __func__);
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spi_interface_resume(spi_p);
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return 0;
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}
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#else
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#define dbmdx_spi_suspend NULL
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#define dbmdx_spi_resume NULL
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_PM
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static int dbmdx_spi_runtime_suspend(struct device *dev)
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{
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struct chip_interface *ci = spi_get_drvdata(to_spi_device(dev));
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struct dbmdx_spi_private *spi_p = (struct dbmdx_spi_private *)ci->pdata;
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dev_dbg(dev, "%s\n", __func__);
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spi_interface_suspend(spi_p);
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return 0;
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}
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static int dbmdx_spi_runtime_resume(struct device *dev)
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{
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struct chip_interface *ci = spi_get_drvdata(to_spi_device(dev));
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struct dbmdx_spi_private *spi_p = (struct dbmdx_spi_private *)ci->pdata;
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dev_dbg(dev, "%s\n", __func__);
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spi_interface_resume(spi_p);
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return 0;
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}
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#else
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#define dbmdx_spi_runtime_suspend NULL
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#define dbmdx_spi_runtime_resume NULL
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#endif /* CONFIG_PM */
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static const struct dev_pm_ops dbmdx_spi_pm = {
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SET_SYSTEM_SLEEP_PM_OPS(dbmdx_spi_suspend, dbmdx_spi_resume)
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SET_RUNTIME_PM_OPS(dbmdx_spi_runtime_suspend,
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dbmdx_spi_runtime_resume, NULL)
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};
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static int dbmd2_spi_probe(struct spi_device *client)
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{
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int rc;
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struct dbmdx_spi_private *p;
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struct chip_interface *ci;
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rc = spi_common_probe(client);
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if (rc < 0)
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return rc;
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ci = spi_get_drvdata(client);
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p = (struct dbmdx_spi_private *)ci->pdata;
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/* fill in chip interface functions */
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p->chip.boot = dbmd2_spi_boot;
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return rc;
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}
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static const struct of_device_id dbmd2_spi_of_match[] = {
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{ .compatible = "dspg,dbmd2-spi", },
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{},
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};
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#ifdef CONFIG_SND_SOC_DBMDX
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MODULE_DEVICE_TABLE(of, dbmd2_spi_of_match);
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#endif
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static const struct spi_device_id dbmd2_spi_id[] = {
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{ "dbmdx-spi", 0 },
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{ "dbmd2-spi", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, dbmd2_spi_id);
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static struct spi_driver dbmd2_spi_driver = {
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.driver = {
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.name = "dbmd2-spi",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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#ifdef CONFIG_OF
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.of_match_table = dbmd2_spi_of_match,
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#endif
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.pm = &dbmdx_spi_pm,
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},
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.probe = dbmd2_spi_probe,
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.remove = spi_common_remove,
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.id_table = dbmd2_spi_id,
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};
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#ifdef CONFIG_SND_SOC_DBMDX
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static int __init dbmd2_modinit(void)
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{
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return spi_register_driver(&dbmd2_spi_driver);
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}
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module_init(dbmd2_modinit);
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static void __exit dbmd2_exit(void)
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{
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spi_unregister_driver(&dbmd2_spi_driver);
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}
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module_exit(dbmd2_exit);
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#else
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int dbmd2_spi_init_interface(void)
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{
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spi_register_driver(&dbmd2_spi_driver);
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return 0;
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}
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void dbmd2_spi_deinit_interface(void)
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{
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spi_unregister_driver(&dbmd2_spi_driver);
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}
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int (*dbmdx_init_interface)(void) = &dbmd2_spi_init_interface;
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void (*dbmdx_deinit_interface)(void) = &dbmd2_spi_deinit_interface;
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#endif
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MODULE_DESCRIPTION("DSPG DBMD2 spi interface driver");
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MODULE_LICENSE("GPL");
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