569 lines
14 KiB
C
569 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* This file is part of wl1271
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*/
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/swab.h>
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#include <linux/crc7.h>
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#include <linux/spi/spi.h>
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#include <linux/platform_device.h>
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#include <linux/of_irq.h>
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#include <linux/regulator/consumer.h>
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#include "wlcore.h"
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#include "wl12xx_80211.h"
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#include "io.h"
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#define WSPI_CMD_READ 0x40000000
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#define WSPI_CMD_WRITE 0x00000000
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#define WSPI_CMD_FIXED 0x20000000
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#define WSPI_CMD_BYTE_LENGTH 0x1FFE0000
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#define WSPI_CMD_BYTE_LENGTH_OFFSET 17
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#define WSPI_CMD_BYTE_ADDR 0x0001FFFF
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#define WSPI_INIT_CMD_CRC_LEN 5
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#define WSPI_INIT_CMD_START 0x00
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#define WSPI_INIT_CMD_TX 0x40
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/* the extra bypass bit is sampled by the TNET as '1' */
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#define WSPI_INIT_CMD_BYPASS_BIT 0x80
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#define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07
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#define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80
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#define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00
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#define WSPI_INIT_CMD_IOD 0x40
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#define WSPI_INIT_CMD_IP 0x20
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#define WSPI_INIT_CMD_CS 0x10
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#define WSPI_INIT_CMD_WS 0x08
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#define WSPI_INIT_CMD_WSPI 0x01
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#define WSPI_INIT_CMD_END 0x01
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#define WSPI_INIT_CMD_LEN 8
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#define HW_ACCESS_WSPI_FIXED_BUSY_LEN \
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((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32))
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#define HW_ACCESS_WSPI_INIT_CMD_MASK 0
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/* HW limitation: maximum possible chunk size is 4095 bytes */
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#define WSPI_MAX_CHUNK_SIZE 4092
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/*
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* wl18xx driver aggregation buffer size is (13 * 4K) compared to
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* (4 * 4K) for wl12xx, so use the larger buffer needed for wl18xx
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*/
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#define SPI_AGGR_BUFFER_SIZE (13 * SZ_4K)
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/* Maximum number of SPI write chunks */
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#define WSPI_MAX_NUM_OF_CHUNKS \
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((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1)
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static const struct wilink_family_data wl127x_data = {
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.name = "wl127x",
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.nvs_name = "ti-connectivity/wl127x-nvs.bin",
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};
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static const struct wilink_family_data wl128x_data = {
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.name = "wl128x",
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.nvs_name = "ti-connectivity/wl128x-nvs.bin",
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};
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static const struct wilink_family_data wl18xx_data = {
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.name = "wl18xx",
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.cfg_name = "ti-connectivity/wl18xx-conf.bin",
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.nvs_name = "ti-connectivity/wl1271-nvs.bin",
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};
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struct wl12xx_spi_glue {
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struct device *dev;
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struct platform_device *core;
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struct regulator *reg; /* Power regulator */
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};
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static void wl12xx_spi_reset(struct device *child)
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{
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
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u8 *cmd;
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struct spi_transfer t;
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struct spi_message m;
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cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
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if (!cmd) {
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dev_err(child->parent,
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"could not allocate cmd for spi reset\n");
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return;
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}
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memset(&t, 0, sizeof(t));
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spi_message_init(&m);
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memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
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t.tx_buf = cmd;
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t.len = WSPI_INIT_CMD_LEN;
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spi_message_add_tail(&t, &m);
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spi_sync(to_spi_device(glue->dev), &m);
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kfree(cmd);
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}
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static void wl12xx_spi_init(struct device *child)
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{
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
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struct spi_transfer t;
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struct spi_message m;
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struct spi_device *spi = to_spi_device(glue->dev);
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u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
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if (!cmd) {
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dev_err(child->parent,
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"could not allocate cmd for spi init\n");
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return;
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}
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memset(&t, 0, sizeof(t));
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spi_message_init(&m);
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/*
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* Set WSPI_INIT_COMMAND
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* the data is being send from the MSB to LSB
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*/
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cmd[0] = 0xff;
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cmd[1] = 0xff;
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cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
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cmd[3] = 0;
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cmd[4] = 0;
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cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
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cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
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cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
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| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
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if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
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cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
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else
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cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
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cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
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/*
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* The above is the logical order; it must actually be stored
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* in the buffer byte-swapped.
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*/
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__swab32s((u32 *)cmd);
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__swab32s((u32 *)cmd+1);
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t.tx_buf = cmd;
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t.len = WSPI_INIT_CMD_LEN;
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spi_message_add_tail(&t, &m);
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spi_sync(to_spi_device(glue->dev), &m);
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/* Send extra clocks with inverted CS (high). this is required
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* by the wilink family in order to successfully enter WSPI mode.
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*/
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spi->mode ^= SPI_CS_HIGH;
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memset(&m, 0, sizeof(m));
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spi_message_init(&m);
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cmd[0] = 0xff;
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cmd[1] = 0xff;
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cmd[2] = 0xff;
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cmd[3] = 0xff;
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__swab32s((u32 *)cmd);
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t.tx_buf = cmd;
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t.len = 4;
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spi_message_add_tail(&t, &m);
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spi_sync(to_spi_device(glue->dev), &m);
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/* Restore chip select configuration to normal */
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spi->mode ^= SPI_CS_HIGH;
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kfree(cmd);
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}
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#define WL1271_BUSY_WORD_TIMEOUT 1000
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static int wl12xx_spi_read_busy(struct device *child)
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{
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
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struct wl1271 *wl = dev_get_drvdata(child);
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struct spi_transfer t[1];
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struct spi_message m;
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u32 *busy_buf;
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int num_busy_bytes = 0;
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/*
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* Read further busy words from SPI until a non-busy word is
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* encountered, then read the data itself into the buffer.
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*/
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num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
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busy_buf = wl->buffer_busyword;
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while (num_busy_bytes) {
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num_busy_bytes--;
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spi_message_init(&m);
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memset(t, 0, sizeof(t));
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t[0].rx_buf = busy_buf;
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t[0].len = sizeof(u32);
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t[0].cs_change = true;
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spi_message_add_tail(&t[0], &m);
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spi_sync(to_spi_device(glue->dev), &m);
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if (*busy_buf & 0x1)
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return 0;
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}
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/* The SPI bus is unresponsive, the read failed. */
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dev_err(child->parent, "SPI read busy-word timeout!\n");
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return -ETIMEDOUT;
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}
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static int __must_check wl12xx_spi_raw_read(struct device *child, int addr,
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void *buf, size_t len, bool fixed)
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{
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
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struct wl1271 *wl = dev_get_drvdata(child);
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struct spi_transfer t[2];
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struct spi_message m;
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u32 *busy_buf;
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u32 *cmd;
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u32 chunk_len;
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while (len > 0) {
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chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
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cmd = &wl->buffer_cmd;
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busy_buf = wl->buffer_busyword;
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*cmd = 0;
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*cmd |= WSPI_CMD_READ;
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*cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
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WSPI_CMD_BYTE_LENGTH;
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*cmd |= addr & WSPI_CMD_BYTE_ADDR;
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if (fixed)
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*cmd |= WSPI_CMD_FIXED;
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spi_message_init(&m);
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memset(t, 0, sizeof(t));
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t[0].tx_buf = cmd;
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t[0].len = 4;
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t[0].cs_change = true;
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spi_message_add_tail(&t[0], &m);
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/* Busy and non busy words read */
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t[1].rx_buf = busy_buf;
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t[1].len = WL1271_BUSY_WORD_LEN;
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t[1].cs_change = true;
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spi_message_add_tail(&t[1], &m);
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spi_sync(to_spi_device(glue->dev), &m);
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if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
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wl12xx_spi_read_busy(child)) {
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memset(buf, 0, chunk_len);
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return 0;
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}
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spi_message_init(&m);
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memset(t, 0, sizeof(t));
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t[0].rx_buf = buf;
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t[0].len = chunk_len;
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t[0].cs_change = true;
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spi_message_add_tail(&t[0], &m);
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spi_sync(to_spi_device(glue->dev), &m);
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if (!fixed)
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addr += chunk_len;
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buf += chunk_len;
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len -= chunk_len;
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}
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return 0;
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}
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static int __wl12xx_spi_raw_write(struct device *child, int addr,
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void *buf, size_t len, bool fixed)
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{
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
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struct spi_transfer *t;
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struct spi_message m;
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u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */
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u32 *cmd;
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u32 chunk_len;
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int i;
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/* SPI write buffers - 2 for each chunk */
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t = kzalloc(sizeof(*t) * 2 * WSPI_MAX_NUM_OF_CHUNKS, GFP_KERNEL);
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if (!t)
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return -ENOMEM;
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WARN_ON(len > SPI_AGGR_BUFFER_SIZE);
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spi_message_init(&m);
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cmd = &commands[0];
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i = 0;
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while (len > 0) {
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chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
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*cmd = 0;
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*cmd |= WSPI_CMD_WRITE;
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*cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
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WSPI_CMD_BYTE_LENGTH;
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*cmd |= addr & WSPI_CMD_BYTE_ADDR;
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if (fixed)
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*cmd |= WSPI_CMD_FIXED;
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t[i].tx_buf = cmd;
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t[i].len = sizeof(*cmd);
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spi_message_add_tail(&t[i++], &m);
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t[i].tx_buf = buf;
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t[i].len = chunk_len;
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spi_message_add_tail(&t[i++], &m);
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if (!fixed)
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addr += chunk_len;
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buf += chunk_len;
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len -= chunk_len;
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cmd++;
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}
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spi_sync(to_spi_device(glue->dev), &m);
|
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kfree(t);
|
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return 0;
|
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}
|
||
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|
||
|
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static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
|
||
|
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void *buf, size_t len, bool fixed)
|
||
|
|
{
|
||
|
|
/* The ELP wakeup write may fail the first time due to internal
|
||
|
|
* hardware latency. It is safer to send the wakeup command twice to
|
||
|
|
* avoid unexpected failures.
|
||
|
|
*/
|
||
|
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if (addr == HW_ACCESS_ELP_CTRL_REG)
|
||
|
|
__wl12xx_spi_raw_write(child, addr, buf, len, fixed);
|
||
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|
||
|
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return __wl12xx_spi_raw_write(child, addr, buf, len, fixed);
|
||
|
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}
|
||
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|
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/**
|
||
|
|
* wl12xx_spi_set_power - power on/off the wl12xx unit
|
||
|
|
* @child: wl12xx device handle.
|
||
|
|
* @enable: true/false to power on/off the unit.
|
||
|
|
*
|
||
|
|
* use the WiFi enable regulator to enable/disable the WiFi unit.
|
||
|
|
*/
|
||
|
|
static int wl12xx_spi_set_power(struct device *child, bool enable)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
|
||
|
|
|
||
|
|
WARN_ON(!glue->reg);
|
||
|
|
|
||
|
|
/* Update regulator state */
|
||
|
|
if (enable) {
|
||
|
|
ret = regulator_enable(glue->reg);
|
||
|
|
if (ret)
|
||
|
|
dev_err(child, "Power enable failure\n");
|
||
|
|
} else {
|
||
|
|
ret = regulator_disable(glue->reg);
|
||
|
|
if (ret)
|
||
|
|
dev_err(child, "Power disable failure\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* wl12xx_spi_set_block_size
|
||
|
|
*
|
||
|
|
* This function is not needed for spi mode, but need to be present.
|
||
|
|
* Without it defined the wlcore fallback to use the wrong packet
|
||
|
|
* allignment on tx.
|
||
|
|
*/
|
||
|
|
static void wl12xx_spi_set_block_size(struct device *child,
|
||
|
|
unsigned int blksz)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct wl1271_if_operations spi_ops = {
|
||
|
|
.read = wl12xx_spi_raw_read,
|
||
|
|
.write = wl12xx_spi_raw_write,
|
||
|
|
.reset = wl12xx_spi_reset,
|
||
|
|
.init = wl12xx_spi_init,
|
||
|
|
.power = wl12xx_spi_set_power,
|
||
|
|
.set_block_size = wl12xx_spi_set_block_size,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct of_device_id wlcore_spi_of_match_table[] = {
|
||
|
|
{ .compatible = "ti,wl1271", .data = &wl127x_data},
|
||
|
|
{ .compatible = "ti,wl1273", .data = &wl127x_data},
|
||
|
|
{ .compatible = "ti,wl1281", .data = &wl128x_data},
|
||
|
|
{ .compatible = "ti,wl1283", .data = &wl128x_data},
|
||
|
|
{ .compatible = "ti,wl1285", .data = &wl128x_data},
|
||
|
|
{ .compatible = "ti,wl1801", .data = &wl18xx_data},
|
||
|
|
{ .compatible = "ti,wl1805", .data = &wl18xx_data},
|
||
|
|
{ .compatible = "ti,wl1807", .data = &wl18xx_data},
|
||
|
|
{ .compatible = "ti,wl1831", .data = &wl18xx_data},
|
||
|
|
{ .compatible = "ti,wl1835", .data = &wl18xx_data},
|
||
|
|
{ .compatible = "ti,wl1837", .data = &wl18xx_data},
|
||
|
|
{ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, wlcore_spi_of_match_table);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* wlcore_probe_of - DT node parsing.
|
||
|
|
* @spi: SPI slave device parameters.
|
||
|
|
* @glue: wl12xx SPI bus to slave device glue parameters.
|
||
|
|
* @pdev_data: wlcore device parameters
|
||
|
|
*/
|
||
|
|
static int wlcore_probe_of(struct spi_device *spi, struct wl12xx_spi_glue *glue,
|
||
|
|
struct wlcore_platdev_data *pdev_data)
|
||
|
|
{
|
||
|
|
struct device_node *dt_node = spi->dev.of_node;
|
||
|
|
const struct of_device_id *of_id;
|
||
|
|
|
||
|
|
of_id = of_match_node(wlcore_spi_of_match_table, dt_node);
|
||
|
|
if (!of_id)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
pdev_data->family = of_id->data;
|
||
|
|
dev_info(&spi->dev, "selected chip family is %s\n",
|
||
|
|
pdev_data->family->name);
|
||
|
|
|
||
|
|
pdev_data->ref_clock_xtal = of_property_read_bool(dt_node, "clock-xtal");
|
||
|
|
|
||
|
|
/* optional clock frequency params */
|
||
|
|
of_property_read_u32(dt_node, "ref-clock-frequency",
|
||
|
|
&pdev_data->ref_clock_freq);
|
||
|
|
of_property_read_u32(dt_node, "tcxo-clock-frequency",
|
||
|
|
&pdev_data->tcxo_clock_freq);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int wl1271_probe(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
struct wl12xx_spi_glue *glue;
|
||
|
|
struct wlcore_platdev_data *pdev_data;
|
||
|
|
struct resource res[1];
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
pdev_data = devm_kzalloc(&spi->dev, sizeof(*pdev_data), GFP_KERNEL);
|
||
|
|
if (!pdev_data)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
pdev_data->if_ops = &spi_ops;
|
||
|
|
|
||
|
|
glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL);
|
||
|
|
if (!glue) {
|
||
|
|
dev_err(&spi->dev, "can't allocate glue\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
glue->dev = &spi->dev;
|
||
|
|
|
||
|
|
spi_set_drvdata(spi, glue);
|
||
|
|
|
||
|
|
/* This is the only SPI value that we need to set here, the rest
|
||
|
|
* comes from the board-peripherals file */
|
||
|
|
spi->bits_per_word = 32;
|
||
|
|
|
||
|
|
glue->reg = devm_regulator_get(&spi->dev, "vwlan");
|
||
|
|
if (IS_ERR(glue->reg))
|
||
|
|
return dev_err_probe(glue->dev, PTR_ERR(glue->reg),
|
||
|
|
"can't get regulator\n");
|
||
|
|
|
||
|
|
ret = wlcore_probe_of(spi, glue, pdev_data);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(glue->dev,
|
||
|
|
"can't get device tree parameters (%d)\n", ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = spi_setup(spi);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(glue->dev, "spi_setup failed\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
glue->core = platform_device_alloc(pdev_data->family->name,
|
||
|
|
PLATFORM_DEVID_AUTO);
|
||
|
|
if (!glue->core) {
|
||
|
|
dev_err(glue->dev, "can't allocate platform_device\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
glue->core->dev.parent = &spi->dev;
|
||
|
|
|
||
|
|
memset(res, 0x00, sizeof(res));
|
||
|
|
|
||
|
|
res[0].start = spi->irq;
|
||
|
|
res[0].flags = IORESOURCE_IRQ | irq_get_trigger_type(spi->irq);
|
||
|
|
res[0].name = "irq";
|
||
|
|
|
||
|
|
ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
|
||
|
|
if (ret) {
|
||
|
|
dev_err(glue->dev, "can't add resources\n");
|
||
|
|
goto out_dev_put;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = platform_device_add_data(glue->core, pdev_data,
|
||
|
|
sizeof(*pdev_data));
|
||
|
|
if (ret) {
|
||
|
|
dev_err(glue->dev, "can't add platform data\n");
|
||
|
|
goto out_dev_put;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = platform_device_add(glue->core);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(glue->dev, "can't register platform device\n");
|
||
|
|
goto out_dev_put;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
out_dev_put:
|
||
|
|
platform_device_put(glue->core);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void wl1271_remove(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);
|
||
|
|
|
||
|
|
platform_device_unregister(glue->core);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct spi_driver wl1271_spi_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "wl1271_spi",
|
||
|
|
.of_match_table = of_match_ptr(wlcore_spi_of_match_table),
|
||
|
|
},
|
||
|
|
|
||
|
|
.probe = wl1271_probe,
|
||
|
|
.remove = wl1271_remove,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_spi_driver(wl1271_spi_driver);
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
|
||
|
|
MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
|
||
|
|
MODULE_ALIAS("spi:wl1271");
|