1 files changed, 351 insertions, 0 deletions
diff --git a/drivers/net/wireless/ti/wl1251/spi.c b/drivers/net/wireless/ti/wl1251/spi.c
new file mode 100644
index 000000000..9df38726e
--- /dev/null
+++ b/drivers/net/wireless/ti/wl1251/spi.c
@@ -0,0 +1,351 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * This file is part of wl1251
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/swab.h>
+#include <linux/crc7.h>
+#include <linux/spi/spi.h>
+#include <linux/wl12xx.h>
+#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/regulator/consumer.h>
+
+#include "wl1251.h"
+#include "reg.h"
+#include "spi.h"
+
+static irqreturn_t wl1251_irq(int irq, void *cookie)
+{
+	struct wl1251 *wl;
+
+	wl1251_debug(DEBUG_IRQ, "IRQ");
+
+	wl = cookie;
+
+	ieee80211_queue_work(wl->hw, &wl->irq_work);
+
+	return IRQ_HANDLED;
+}
+
+static struct spi_device *wl_to_spi(struct wl1251 *wl)
+{
+	return wl->if_priv;
+}
+
+static void wl1251_spi_reset(struct wl1251 *wl)
+{
+	u8 *cmd;
+	struct spi_transfer t;
+	struct spi_message m;
+
+	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
+	if (!cmd) {
+		wl1251_error("could not allocate cmd for spi reset");
+		return;
+	}
+
+	memset(&t, 0, sizeof(t));
+	spi_message_init(&m);
+
+	memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
+
+	t.tx_buf = cmd;
+	t.len = WSPI_INIT_CMD_LEN;
+	spi_message_add_tail(&t, &m);
+
+	spi_sync(wl_to_spi(wl), &m);
+
+	wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
+
+	kfree(cmd);
+}
+
+static void wl1251_spi_wake(struct wl1251 *wl)
+{
+	struct spi_transfer t;
+	struct spi_message m;
+	u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
+
+	if (!cmd) {
+		wl1251_error("could not allocate cmd for spi init");
+		return;
+	}
+
+	memset(&t, 0, sizeof(t));
+	spi_message_init(&m);
+
+	/* Set WSPI_INIT_COMMAND
+	 * the data is being send from the MSB to LSB
+	 */
+	cmd[0] = 0xff;
+	cmd[1] = 0xff;
+	cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
+	cmd[3] = 0;
+	cmd[4] = 0;
+	cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
+	cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
+
+	cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
+		| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
+
+	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
+		cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
+	else
+		cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
+
+	cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
+	/*
+	 * The above is the logical order; it must actually be stored
+	 * in the buffer byte-swapped.
+	 */
+	__swab32s((u32 *)cmd);
+	__swab32s((u32 *)cmd+1);
+
+	t.tx_buf = cmd;
+	t.len = WSPI_INIT_CMD_LEN;
+	spi_message_add_tail(&t, &m);
+
+	spi_sync(wl_to_spi(wl), &m);
+
+	wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
+
+	kfree(cmd);
+}
+
+static void wl1251_spi_reset_wake(struct wl1251 *wl)
+{
+	wl1251_spi_reset(wl);
+	wl1251_spi_wake(wl);
+}
+
+static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
+			    size_t len)
+{
+	struct spi_transfer t[3];
+	struct spi_message m;
+	u8 *busy_buf;
+	u32 *cmd;
+
+	cmd = &wl->buffer_cmd;
+	busy_buf = wl->buffer_busyword;
+
+	*cmd = 0;
+	*cmd |= WSPI_CMD_READ;
+	*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
+	*cmd |= addr & WSPI_CMD_BYTE_ADDR;
+
+	spi_message_init(&m);
+	memset(t, 0, sizeof(t));
+
+	t[0].tx_buf = cmd;
+	t[0].len = 4;
+	spi_message_add_tail(&t[0], &m);
+
+	/* Busy and non busy words read */
+	t[1].rx_buf = busy_buf;
+	t[1].len = WL1251_BUSY_WORD_LEN;
+	spi_message_add_tail(&t[1], &m);
+
+	t[2].rx_buf = buf;
+	t[2].len = len;
+	spi_message_add_tail(&t[2], &m);
+
+	spi_sync(wl_to_spi(wl), &m);
+
+	/* FIXME: check busy words */
+
+	wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
+	wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
+}
+
+static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
+			     size_t len)
+{
+	struct spi_transfer t[2];
+	struct spi_message m;
+	u32 *cmd;
+
+	cmd = &wl->buffer_cmd;
+
+	*cmd = 0;
+	*cmd |= WSPI_CMD_WRITE;
+	*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
+	*cmd |= addr & WSPI_CMD_BYTE_ADDR;
+
+	spi_message_init(&m);
+	memset(t, 0, sizeof(t));
+
+	t[0].tx_buf = cmd;
+	t[0].len = sizeof(*cmd);
+	spi_message_add_tail(&t[0], &m);
+
+	t[1].tx_buf = buf;
+	t[1].len = len;
+	spi_message_add_tail(&t[1], &m);
+
+	spi_sync(wl_to_spi(wl), &m);
+
+	wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
+	wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
+}
+
+static void wl1251_spi_enable_irq(struct wl1251 *wl)
+{
+	return enable_irq(wl->irq);
+}
+
+static void wl1251_spi_disable_irq(struct wl1251 *wl)
+{
+	return disable_irq(wl->irq);
+}
+
+static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
+{
+	if (gpio_is_valid(wl->power_gpio))
+		gpio_set_value(wl->power_gpio, enable);
+
+	return 0;
+}
+
+static const struct wl1251_if_operations wl1251_spi_ops = {
+	.read = wl1251_spi_read,
+	.write = wl1251_spi_write,
+	.reset = wl1251_spi_reset_wake,
+	.enable_irq = wl1251_spi_enable_irq,
+	.disable_irq = wl1251_spi_disable_irq,
+	.power = wl1251_spi_set_power,
+};
+
+static int wl1251_spi_probe(struct spi_device *spi)
+{
+	struct wl1251_platform_data *pdata = dev_get_platdata(&spi->dev);
+	struct device_node *np = spi->dev.of_node;
+	struct ieee80211_hw *hw;
+	struct wl1251 *wl;
+	int ret;
+
+	if (!np && !pdata) {
+		wl1251_error("no platform data");
+		return -ENODEV;
+	}
+
+	hw = wl1251_alloc_hw();
+	if (IS_ERR(hw))
+		return PTR_ERR(hw);
+
+	wl = hw->priv;
+
+	SET_IEEE80211_DEV(hw, &spi->dev);
+	spi_set_drvdata(spi, wl);
+	wl->if_priv = spi;
+	wl->if_ops = &wl1251_spi_ops;
+
+	/* 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;
+
+	ret = spi_setup(spi);
+	if (ret < 0) {
+		wl1251_error("spi_setup failed");
+		goto out_free;
+	}
+
+	if (np) {
+		wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
+		wl->power_gpio = of_get_named_gpio(np, "ti,power-gpio", 0);
+	} else if (pdata) {
+		wl->power_gpio = pdata->power_gpio;
+		wl->use_eeprom = pdata->use_eeprom;
+	}
+
+	if (wl->power_gpio == -EPROBE_DEFER) {
+		ret = -EPROBE_DEFER;
+		goto out_free;
+	}
+
+	if (gpio_is_valid(wl->power_gpio)) {
+		ret = devm_gpio_request_one(&spi->dev, wl->power_gpio,
+					GPIOF_OUT_INIT_LOW, "wl1251 power");
+		if (ret) {
+			wl1251_error("Failed to request gpio: %d\n", ret);
+			goto out_free;
+		}
+	} else {
+		wl1251_error("set power gpio missing in platform data");
+		ret = -ENODEV;
+		goto out_free;
+	}
+
+	wl->irq = spi->irq;
+	if (wl->irq < 0) {
+		wl1251_error("irq missing in platform data");
+		ret = -ENODEV;
+		goto out_free;
+	}
+
+	irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
+	ret = devm_request_irq(&spi->dev, wl->irq, wl1251_irq, 0,
+							DRIVER_NAME, wl);
+	if (ret < 0) {
+		wl1251_error("request_irq() failed: %d", ret);
+		goto out_free;
+	}
+
+	irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
+
+	wl->vio = devm_regulator_get(&spi->dev, "vio");
+	if (IS_ERR(wl->vio)) {
+		ret = PTR_ERR(wl->vio);
+		wl1251_error("vio regulator missing: %d", ret);
+		goto out_free;
+	}
+
+	ret = regulator_enable(wl->vio);
+	if (ret)
+		goto out_free;
+
+	ret = wl1251_init_ieee80211(wl);
+	if (ret)
+		goto disable_regulator;
+
+	return 0;
+
+disable_regulator:
+	regulator_disable(wl->vio);
+out_free:
+	ieee80211_free_hw(hw);
+
+	return ret;
+}
+
+static void wl1251_spi_remove(struct spi_device *spi)
+{
+	struct wl1251 *wl = spi_get_drvdata(spi);
+
+	wl1251_free_hw(wl);
+	regulator_disable(wl->vio);
+}
+
+static struct spi_driver wl1251_spi_driver = {
+	.driver = {
+		.name		= DRIVER_NAME,
+	},
+
+	.probe		= wl1251_spi_probe,
+	.remove		= wl1251_spi_remove,
+};
+
+module_spi_driver(wl1251_spi_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
+MODULE_ALIAS("spi:wl1251");