staging: wfx: load firmware

A firmware is necessary to run the chip. wfx_init_device() is in charge
of loading firmware on chip and doing low level initialization.

Firmwares for WF200 are available here:

  https://github.com/SiliconLabs/wfx-firmware/

Note that firmware are encrypted. Driver checks that key used to encrypt
firmware match with key burned into chip.

Currently, "C0" key is used for production chips.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20190919142527.31797-6-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/Makefile

@@ -5,6 +5,7 @@ CFLAGS_debug.o = -I$(src)
 
 wfx-y := \
 	hwio.o \
+	fwio.o \
 	main.o \
 	debug.o
 wfx-$(CONFIG_SPI) += bus_spi.o

drivers/staging/wfx/bus_sdio.c

@@ -17,6 +17,7 @@
 #include "main.h"
 
 static const struct wfx_platform_data wfx_sdio_pdata = {
+	.file_fw = "wfm_wf200",
 };
 
 struct wfx_sdio_priv {
@@ -204,8 +205,14 @@ static int wfx_sdio_probe(struct sdio_func *func,
 		goto err2;
 	}
 
+	ret = wfx_probe(bus->core);
+	if (ret)
+		goto err3;
+
 	return 0;
 
+err3:
+	wfx_free_common(bus->core);
 err2:
 	wfx_sdio_irq_unsubscribe(bus);
 err1:
@@ -220,6 +227,7 @@ static void wfx_sdio_remove(struct sdio_func *func)
 {
 	struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
 
+	wfx_release(bus->core);
 	wfx_free_common(bus->core);
 	wfx_sdio_irq_unsubscribe(bus);
 	sdio_claim_host(func);

drivers/staging/wfx/bus_spi.c

@@ -27,6 +27,8 @@ MODULE_PARM_DESC(gpio_reset, "gpio number for reset. -1 for none.");
 #define SET_READ 0x8000         /* usage: or operation */
 
 static const struct wfx_platform_data wfx_spi_pdata = {
+	.file_fw = "wfm_wf200",
+	.use_rising_clk = true,
 };
 
 struct wfx_spi_priv {
@@ -205,6 +207,10 @@ static int wfx_spi_probe(struct spi_device *func)
 	if (!bus->core)
 		return -EIO;
 
+	ret = wfx_probe(bus->core);
+	if (ret)
+		wfx_free_common(bus->core);
+
 	return ret;
 }
 
@@ -213,6 +219,7 @@ static int wfx_spi_disconnect(struct spi_device *func)
 {
 	struct wfx_spi_priv *bus = spi_get_drvdata(func);
 
+	wfx_release(bus->core);
 	wfx_free_common(bus->core);
 	// A few IRQ will be sent during device release. Hopefully, no IRQ
 	// should happen after wdev/wvif are released.

drivers/staging/wfx/fwio.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Firmware loading.
+ *
+ * Copyright (c) 2017-2019, Silicon Laboratories, Inc.
+ * Copyright (c) 2010, ST-Ericsson
+ */
+#ifndef WFX_FWIO_H
+#define WFX_FWIO_H
+
+struct wfx_dev;
+
+int wfx_init_device(struct wfx_dev *wdev);
+
+#endif /* WFX_FWIO_H */

drivers/staging/wfx/main.c

@@ -20,6 +20,8 @@
 
 #include "main.h"
 #include "wfx.h"
+#include "fwio.h"
+#include "hwio.h"
 #include "bus.h"
 #include "wfx_version.h"
 
@@ -76,6 +78,24 @@ void wfx_free_common(struct wfx_dev *wdev)
 {
 }
 
+int wfx_probe(struct wfx_dev *wdev)
+{
+	int err;
+
+	err = wfx_init_device(wdev);
+	if (err)
+		goto err1;
+
+	return 0;
+
+err1:
+	return err;
+}
+
+void wfx_release(struct wfx_dev *wdev)
+{
+}
+
 static int __init wfx_core_init(void)
 {
 	int ret = 0;

drivers/staging/wfx/main.h

@@ -18,6 +18,13 @@
 struct wfx_dev;
 
 struct wfx_platform_data {
+	/* Keyset and ".sec" extention will appended to this string */
+	const char *file_fw;
+	/*
+	 * if true HIF D_out is sampled on the rising edge of the clock
+	 * (intended to be used in 50Mhz SDIO)
+	 */
+	bool use_rising_clk;
 };
 
 struct wfx_dev *wfx_init_common(struct device *dev,
@@ -26,6 +33,9 @@ struct wfx_dev *wfx_init_common(struct device *dev,
 				void *hwbus_priv);
 void wfx_free_common(struct wfx_dev *wdev);
 
+int wfx_probe(struct wfx_dev *wdev);
+void wfx_release(struct wfx_dev *wdev);
+
 struct gpio_desc *wfx_get_gpio(struct device *dev, int override,
 			       const char *label);
 

drivers/staging/wfx/wfx.h

@@ -19,6 +19,8 @@ struct wfx_dev {
 	struct device		*dev;
 	const struct hwbus_ops	*hwbus_ops;
 	void			*hwbus_priv;
+
+	u8			keyset;
 };
 
 #endif /* WFX_H */