348 lines
7.2 KiB
C
348 lines
7.2 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 wl1251
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*
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* Copyright (C) 2008 Nokia Corporation
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*/
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#include <linux/err.h>
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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/gpio/consumer.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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#include "wl1251.h"
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#include "reg.h"
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#include "spi.h"
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struct wl1251_spi {
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struct spi_device *spi;
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struct gpio_desc *power_gpio;
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};
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static irqreturn_t wl1251_irq(int irq, void *cookie)
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{
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struct wl1251 *wl;
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wl1251_debug(DEBUG_IRQ, "IRQ");
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wl = cookie;
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ieee80211_queue_work(wl->hw, &wl->irq_work);
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return IRQ_HANDLED;
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}
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static void wl1251_spi_reset(struct wl1251 *wl)
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{
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struct wl1251_spi *wl_spi = wl->if_priv;
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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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wl1251_error("could not allocate cmd for spi reset");
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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(wl_spi->spi, &m);
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wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
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kfree(cmd);
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}
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static void wl1251_spi_wake(struct wl1251 *wl)
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{
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struct wl1251_spi *wl_spi = wl->if_priv;
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struct spi_transfer t;
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struct spi_message m;
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u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
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if (!cmd) {
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wl1251_error("could not allocate cmd for spi init");
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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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/* 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(wl_spi->spi, &m);
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wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
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kfree(cmd);
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}
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static void wl1251_spi_reset_wake(struct wl1251 *wl)
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{
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wl1251_spi_reset(wl);
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wl1251_spi_wake(wl);
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}
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static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
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size_t len)
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{
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struct wl1251_spi *wl_spi = wl->if_priv;
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struct spi_transfer t[3];
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struct spi_message m;
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u8 *busy_buf;
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u32 *cmd;
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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 |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
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*cmd |= addr & WSPI_CMD_BYTE_ADDR;
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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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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 = WL1251_BUSY_WORD_LEN;
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spi_message_add_tail(&t[1], &m);
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t[2].rx_buf = buf;
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t[2].len = len;
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spi_message_add_tail(&t[2], &m);
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spi_sync(wl_spi->spi, &m);
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/* FIXME: check busy words */
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wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
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wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
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}
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static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
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size_t len)
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{
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struct wl1251_spi *wl_spi = wl->if_priv;
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struct spi_transfer t[2];
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struct spi_message m;
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u32 *cmd;
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cmd = &wl->buffer_cmd;
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*cmd = 0;
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*cmd |= WSPI_CMD_WRITE;
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*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
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*cmd |= addr & WSPI_CMD_BYTE_ADDR;
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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 = sizeof(*cmd);
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spi_message_add_tail(&t[0], &m);
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t[1].tx_buf = buf;
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t[1].len = len;
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spi_message_add_tail(&t[1], &m);
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spi_sync(wl_spi->spi, &m);
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wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
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wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
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}
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static void wl1251_spi_enable_irq(struct wl1251 *wl)
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{
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return enable_irq(wl->irq);
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}
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static void wl1251_spi_disable_irq(struct wl1251 *wl)
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{
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return disable_irq(wl->irq);
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}
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static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
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{
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struct wl1251_spi *wl_spi = wl->if_priv;
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if (wl_spi->power_gpio)
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gpiod_set_value_cansleep(wl_spi->power_gpio, enable);
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return 0;
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}
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static const struct wl1251_if_operations wl1251_spi_ops = {
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.read = wl1251_spi_read,
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.write = wl1251_spi_write,
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.reset = wl1251_spi_reset_wake,
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.enable_irq = wl1251_spi_enable_irq,
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.disable_irq = wl1251_spi_disable_irq,
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.power = wl1251_spi_set_power,
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};
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static int wl1251_spi_probe(struct spi_device *spi)
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{
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struct device_node *np = spi->dev.of_node;
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struct ieee80211_hw *hw;
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struct wl1251_spi *wl_spi;
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struct wl1251 *wl;
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int ret;
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if (!np)
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return -ENODEV;
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wl_spi = devm_kzalloc(&spi->dev, sizeof(*wl_spi), GFP_KERNEL);
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if (!wl_spi)
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return -ENOMEM;
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wl_spi->spi = spi;
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hw = wl1251_alloc_hw();
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if (IS_ERR(hw))
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return PTR_ERR(hw);
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wl = hw->priv;
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SET_IEEE80211_DEV(hw, &spi->dev);
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spi_set_drvdata(spi, wl);
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wl->if_priv = wl_spi;
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wl->if_ops = &wl1251_spi_ops;
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/* This is the only SPI value that we need to set here, the rest
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* comes from the board-peripherals file
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*/
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spi->bits_per_word = 32;
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ret = spi_setup(spi);
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if (ret < 0) {
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wl1251_error("spi_setup failed");
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goto out_free;
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}
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wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
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wl_spi->power_gpio = devm_gpiod_get_optional(&spi->dev, "ti,power",
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GPIOD_OUT_LOW);
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ret = PTR_ERR_OR_ZERO(wl_spi->power_gpio);
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if (ret) {
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if (ret != -EPROBE_DEFER)
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wl1251_error("Failed to request gpio: %d\n", ret);
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goto out_free;
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}
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gpiod_set_consumer_name(wl_spi->power_gpio, "wl1251 power");
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wl->irq = spi->irq;
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if (wl->irq < 0) {
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wl1251_error("irq missing in platform data");
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ret = -ENODEV;
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goto out_free;
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}
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irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
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ret = devm_request_irq(&spi->dev, wl->irq, wl1251_irq, 0,
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DRIVER_NAME, wl);
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if (ret < 0) {
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wl1251_error("request_irq() failed: %d", ret);
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goto out_free;
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}
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irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
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wl->vio = devm_regulator_get(&spi->dev, "vio");
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if (IS_ERR(wl->vio)) {
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ret = PTR_ERR(wl->vio);
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wl1251_error("vio regulator missing: %d", ret);
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goto out_free;
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}
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ret = regulator_enable(wl->vio);
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if (ret)
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goto out_free;
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ret = wl1251_init_ieee80211(wl);
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if (ret)
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goto disable_regulator;
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return 0;
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disable_regulator:
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regulator_disable(wl->vio);
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out_free:
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ieee80211_free_hw(hw);
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return ret;
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}
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static void wl1251_spi_remove(struct spi_device *spi)
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{
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struct wl1251 *wl = spi_get_drvdata(spi);
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wl1251_free_hw(wl);
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regulator_disable(wl->vio);
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}
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static struct spi_driver wl1251_spi_driver = {
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.driver = {
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.name = DRIVER_NAME,
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},
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.probe = wl1251_spi_probe,
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.remove = wl1251_spi_remove,
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};
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module_spi_driver(wl1251_spi_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
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MODULE_ALIAS("spi:wl1251");
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