1 files changed, 409 insertions, 0 deletions
diff --git a/drivers/net/wireless/cw1200/cw1200_sdio.c b/drivers/net/wireless/cw1200/cw1200_sdio.c
new file mode 100644
index 000000000000..f6e22192d80a
--- /dev/null
+++ b/drivers/net/wireless/cw1200/cw1200_sdio.c
@@ -0,0 +1,409 @@
+/*
+ * Mac80211 SDIO driver for ST-Ericsson CW1200 device
+ *
+ * Copyright (c) 2010, ST-Ericsson
+ * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/sdio_func.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
+#include <net/mac80211.h>
+
+#include "cw1200.h"
+#include "sbus.h"
+#include <linux/cw1200_platform.h>
+#include "hwio.h"
+
+MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>");
+MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver");
+MODULE_LICENSE("GPL");
+
+#define SDIO_BLOCK_SIZE (512)
+
+struct sbus_priv {
+	struct sdio_func	*func;
+	struct cw1200_common	*core;
+	const struct cw1200_platform_data_sdio *pdata;
+};
+
+#ifndef SDIO_VENDOR_ID_STE
+#define SDIO_VENDOR_ID_STE		0x0020
+#endif
+
+#ifndef SDIO_DEVICE_ID_STE_CW1200
+#define SDIO_DEVICE_ID_STE_CW1200	0x2280
+#endif
+
+static const struct sdio_device_id cw1200_sdio_ids[] = {
+	{ SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) },
+	{ /* end: all zeroes */			},
+};
+
+/* sbus_ops implemetation */
+
+static int cw1200_sdio_memcpy_fromio(struct sbus_priv *self,
+				     unsigned int addr,
+				     void *dst, int count)
+{
+	return sdio_memcpy_fromio(self->func, dst, addr, count);
+}
+
+static int cw1200_sdio_memcpy_toio(struct sbus_priv *self,
+				   unsigned int addr,
+				   const void *src, int count)
+{
+	return sdio_memcpy_toio(self->func, addr, (void *)src, count);
+}
+
+static void cw1200_sdio_lock(struct sbus_priv *self)
+{
+	sdio_claim_host(self->func);
+}
+
+static void cw1200_sdio_unlock(struct sbus_priv *self)
+{
+	sdio_release_host(self->func);
+}
+
+static void cw1200_sdio_irq_handler(struct sdio_func *func)
+{
+	struct sbus_priv *self = sdio_get_drvdata(func);
+
+	/* note:  sdio_host already claimed here. */
+	if (self->core)
+		cw1200_irq_handler(self->core);
+}
+
+static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id)
+{
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id)
+{
+	struct sbus_priv *self = dev_id;
+
+	if (self->core) {
+		sdio_claim_host(self->func);
+		cw1200_irq_handler(self->core);
+		sdio_release_host(self->func);
+		return IRQ_HANDLED;
+	} else {
+		return IRQ_NONE;
+	}
+}
+
+static int cw1200_request_irq(struct sbus_priv *self)
+{
+	int ret;
+	const struct resource *irq = self->pdata->irq;
+	u8 cccr;
+
+	cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret);
+	if (WARN_ON(ret))
+		goto err;
+
+	/* Master interrupt enable ... */
+	cccr |= BIT(0);
+
+	/* ... for our function */
+	cccr |= BIT(self->func->num);
+
+	sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret);
+	if (WARN_ON(ret))
+		goto err;
+
+	ret = enable_irq_wake(irq->start);
+	if (WARN_ON(ret))
+		goto err;
+
+	/* Request the IRQ */
+	ret =  request_threaded_irq(irq->start, cw1200_gpio_hardirq,
+				    cw1200_gpio_irq,
+				    IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+				    irq->name, self);
+	if (WARN_ON(ret))
+		goto err;
+
+	return 0;
+
+err:
+	return ret;
+}
+
+static int cw1200_sdio_irq_subscribe(struct sbus_priv *self)
+{
+	int ret = 0;
+
+	pr_debug("SW IRQ subscribe\n");
+	sdio_claim_host(self->func);
+	if (self->pdata->irq)
+		ret = cw1200_request_irq(self);
+	else
+		ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler);
+
+	sdio_release_host(self->func);
+	return ret;
+}
+
+static int cw1200_sdio_irq_unsubscribe(struct sbus_priv *self)
+{
+	int ret = 0;
+
+	pr_debug("SW IRQ unsubscribe\n");
+
+	if (self->pdata->irq) {
+		disable_irq_wake(self->pdata->irq->start);
+		free_irq(self->pdata->irq->start, self);
+	} else {
+		sdio_claim_host(self->func);
+		ret = sdio_release_irq(self->func);
+		sdio_release_host(self->func);
+	}
+	return ret;
+}
+
+static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata)
+{
+	const struct resource *reset = pdata->reset;
+
+	if (reset) {
+		gpio_set_value(reset->start, 0);
+		msleep(30); /* Min is 2 * CLK32K cycles */
+		gpio_free(reset->start);
+	}
+
+	if (pdata->power_ctrl)
+		pdata->power_ctrl(pdata, false);
+	if (pdata->clk_ctrl)
+		pdata->clk_ctrl(pdata, false);
+
+	return 0;
+}
+
+static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata)
+{
+	const struct resource *reset = pdata->reset;
+	const struct resource *powerup = pdata->reset;
+
+	/* Ensure I/Os are pulled low */
+	if (reset) {
+		gpio_request(reset->start, reset->name);
+		gpio_direction_output(reset->start, 0);
+	}
+	if (powerup) {
+		gpio_request(powerup->start, powerup->name);
+		gpio_direction_output(powerup->start, 0);
+	}
+	if (reset || powerup)
+		msleep(50); /* Settle time */
+
+	/* Enable 3v3 and 1v8 to hardware */
+	if (pdata->power_ctrl) {
+		if (pdata->power_ctrl(pdata, true)) {
+			pr_err("power_ctrl() failed!\n");
+			return -1;
+		}
+	}
+
+	/* Enable CLK32K */
+	if (pdata->clk_ctrl) {
+		if (pdata->clk_ctrl(pdata, true)) {
+			pr_err("clk_ctrl() failed!\n");
+			return -1;
+		}
+		msleep(10); /* Delay until clock is stable for 2 cycles */
+	}
+
+	/* Enable POWERUP signal */
+	if (powerup) {
+		gpio_set_value(powerup->start, 1);
+		msleep(250); /* or more..? */
+	}
+	/* Enable RSTn signal */
+	if (reset) {
+		gpio_set_value(reset->start, 1);
+		msleep(50); /* Or more..? */
+	}
+	return 0;
+}
+
+static size_t cw1200_sdio_align_size(struct sbus_priv *self, size_t size)
+{
+	if (self->pdata->no_nptb)
+		size = round_up(size, SDIO_BLOCK_SIZE);
+	else
+		size = sdio_align_size(self->func, size);
+
+	return size;
+}
+
+static int cw1200_sdio_pm(struct sbus_priv *self, bool suspend)
+{
+	int ret = 0;
+
+	if (self->pdata->irq)
+		ret = irq_set_irq_wake(self->pdata->irq->start, suspend);
+	return ret;
+}
+
+static struct sbus_ops cw1200_sdio_sbus_ops = {
+	.sbus_memcpy_fromio	= cw1200_sdio_memcpy_fromio,
+	.sbus_memcpy_toio	= cw1200_sdio_memcpy_toio,
+	.lock			= cw1200_sdio_lock,
+	.unlock			= cw1200_sdio_unlock,
+	.align_size		= cw1200_sdio_align_size,
+	.power_mgmt		= cw1200_sdio_pm,
+};
+
+/* Probe Function to be called by SDIO stack when device is discovered */
+static int cw1200_sdio_probe(struct sdio_func *func,
+				       const struct sdio_device_id *id)
+{
+	struct sbus_priv *self;
+	int status;
+
+	pr_info("cw1200_wlan_sdio: Probe called\n");
+
+       /* We are only able to handle the wlan function */
+	if (func->num != 0x01)
+		return -ENODEV;
+
+	self = kzalloc(sizeof(*self), GFP_KERNEL);
+	if (!self) {
+		pr_err("Can't allocate SDIO sbus_priv.\n");
+		return -ENOMEM;
+	}
+
+	func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
+
+	self->pdata = cw1200_get_platform_data();
+	self->func = func;
+	sdio_set_drvdata(func, self);
+	sdio_claim_host(func);
+	sdio_enable_func(func);
+	sdio_release_host(func);
+
+	status = cw1200_sdio_irq_subscribe(self);
+
+	status = cw1200_core_probe(&cw1200_sdio_sbus_ops,
+				   self, &func->dev, &self->core,
+				   self->pdata->ref_clk,
+				   self->pdata->macaddr,
+				   self->pdata->sdd_file,
+				   self->pdata->have_5ghz);
+	if (status) {
+		cw1200_sdio_irq_unsubscribe(self);
+		sdio_claim_host(func);
+		sdio_disable_func(func);
+		sdio_release_host(func);
+		sdio_set_drvdata(func, NULL);
+		kfree(self);
+	}
+
+	return status;
+}
+
+/* Disconnect Function to be called by SDIO stack when
+ * device is disconnected */
+static void cw1200_sdio_disconnect(struct sdio_func *func)
+{
+	struct sbus_priv *self = sdio_get_drvdata(func);
+
+	if (self) {
+		cw1200_sdio_irq_unsubscribe(self);
+		if (self->core) {
+			cw1200_core_release(self->core);
+			self->core = NULL;
+		}
+		sdio_claim_host(func);
+		sdio_disable_func(func);
+		sdio_release_host(func);
+		sdio_set_drvdata(func, NULL);
+		kfree(self);
+	}
+}
+
+static int cw1200_sdio_suspend(struct device *dev)
+{
+	int ret;
+	struct sdio_func *func = dev_to_sdio_func(dev);
+	struct sbus_priv *self = sdio_get_drvdata(func);
+
+	if (!cw1200_can_suspend(self->core))
+		return -EAGAIN;
+
+	/* Notify SDIO that CW1200 will remain powered during suspend */
+	ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
+	if (ret)
+		pr_err("Error setting SDIO pm flags: %i\n", ret);
+
+	return ret;
+}
+
+static int cw1200_sdio_resume(struct device *dev)
+{
+	return 0;
+}
+
+static const struct dev_pm_ops cw1200_pm_ops = {
+	.suspend = cw1200_sdio_suspend,
+	.resume = cw1200_sdio_resume,
+};
+
+static struct sdio_driver sdio_driver = {
+	.name		= "cw1200_wlan_sdio",
+	.id_table	= cw1200_sdio_ids,
+	.probe		= cw1200_sdio_probe,
+	.remove		= cw1200_sdio_disconnect,
+	.drv = {
+		.pm = &cw1200_pm_ops,
+	}
+};
+
+/* Init Module function -> Called by insmod */
+static int __init cw1200_sdio_init(void)
+{
+	const struct cw1200_platform_data_sdio *pdata;
+	int ret;
+
+	pdata = cw1200_get_platform_data();
+
+	if (cw1200_sdio_on(pdata)) {
+		ret = -1;
+		goto err;
+	}
+
+	ret = sdio_register_driver(&sdio_driver);
+	if (ret)
+		goto err;
+
+	return 0;
+
+err:
+	cw1200_sdio_off(pdata);
+	return ret;
+}
+
+/* Called at Driver Unloading */
+static void __exit cw1200_sdio_exit(void)
+{
+	const struct cw1200_platform_data_sdio *pdata;
+	pdata = cw1200_get_platform_data();
+	sdio_unregister_driver(&sdio_driver);
+	cw1200_sdio_off(pdata);
+}
+
+
+module_init(cw1200_sdio_init);
+module_exit(cw1200_sdio_exit);