Message-ID: <20241029172354.4027886-5-michael.nemanov@ti.com>
Date: Tue, 29 Oct 2024 19:23:41 +0200
From: Michael Nemanov <michael.nemanov@...com>
To: Kalle Valo <kvalo@...nel.org>, "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo
 Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, <linux-wireless@...r.kernel.org>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: Sabeeh Khan <sabeeh-khan@...com>, Michael Nemanov <michael.nemanov@...com>
Subject: [PATCH v4 04/17] wifi: cc33xx: Add sdio.c, io.c, io.h

sdio.c implements SDIO transport functions. These are bound into
struct cc33xx_if_operations and accessed via io.h in order to abstract
multiple transport interfaces such as SPI in the future.
The CC33xx driver supports the SDIO in-band IRQ option so the IRQ from
the device received here as well.
Unlike wl1xxx products, there is no longer mapping between
HW and SDIO / SPI address space of any kind.
There are only 3 valid addresses for control, data and status
transactions each with a predefined structure.

Signed-off-by: Michael Nemanov <michael.nemanov@...com>
---
 drivers/net/wireless/ti/cc33xx/io.c   | 129 +++++++
 drivers/net/wireless/ti/cc33xx/io.h   |  26 ++
 drivers/net/wireless/ti/cc33xx/sdio.c | 530 ++++++++++++++++++++++++++
 3 files changed, 685 insertions(+)
 create mode 100644 drivers/net/wireless/ti/cc33xx/io.c
 create mode 100644 drivers/net/wireless/ti/cc33xx/io.h
 create mode 100644 drivers/net/wireless/ti/cc33xx/sdio.c

diff --git a/drivers/net/wireless/ti/cc33xx/io.c b/drivers/net/wireless/ti/cc33xx/io.c
new file mode 100644
index 000000000000..59696004efe9
--- /dev/null
+++ b/drivers/net/wireless/ti/cc33xx/io.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022-2024 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+#include "cc33xx.h"
+#include "debug.h"
+#include "io.h"
+#include "tx.h"
+
+bool cc33xx_set_block_size(struct cc33xx *cc)
+{
+	if (cc->if_ops->set_block_size) {
+		cc->if_ops->set_block_size(cc->dev, CC33XX_BUS_BLOCK_SIZE);
+		cc33xx_debug(DEBUG_CC33xx,
+			     "Set BLKsize to %d", CC33XX_BUS_BLOCK_SIZE);
+		return true;
+	}
+
+	cc33xx_debug(DEBUG_CC33xx, "Could not set BLKsize");
+	return false;
+}
+
+void cc33xx_disable_interrupts_nosync(struct cc33xx *cc)
+{
+	cc->if_ops->disable_irq(cc->dev);
+}
+
+void cc33xx_irq(void *cookie);
+void cc33xx_enable_interrupts(struct cc33xx *cc)
+{
+	cc->if_ops->enable_irq(cc->dev);
+
+	cc33xx_irq(cc);
+}
+
+void cc33xx_io_reset(struct cc33xx *cc)
+{
+	if (cc->if_ops->reset)
+		cc->if_ops->reset(cc->dev);
+}
+
+void cc33xx_io_init(struct cc33xx *cc)
+{
+	if (cc->if_ops->init)
+		cc->if_ops->init(cc->dev);
+}
+
+/* Raw target IO, address is not translated */
+static int __must_check cc33xx_raw_write(struct cc33xx *cc, int addr,
+					 void *buf, size_t len, bool fixed)
+{
+	int ret;
+
+	if (test_bit(CC33XX_FLAG_IO_FAILED, &cc->flags) ||
+	    WARN_ON((test_bit(CC33XX_FLAG_IN_ELP, &cc->flags) &&
+		     addr != HW_ACCESS_ELP_CTRL_REG)))
+		return -EIO;
+
+	ret = cc->if_ops->write(cc->dev, addr, buf, len, fixed);
+	if (ret && cc->state != CC33XX_STATE_OFF)
+		set_bit(CC33XX_FLAG_IO_FAILED, &cc->flags);
+
+	return ret;
+}
+
+int __must_check cc33xx_raw_read(struct cc33xx *cc, int addr,
+				 void *buf, size_t len, bool fixed)
+{
+	int ret;
+
+	if (test_bit(CC33XX_FLAG_IO_FAILED, &cc->flags) ||
+	    WARN_ON((test_bit(CC33XX_FLAG_IN_ELP, &cc->flags) &&
+		     addr != HW_ACCESS_ELP_CTRL_REG)))
+		return -EIO;
+
+	ret = cc->if_ops->read(cc->dev, addr, buf, len, fixed);
+	if (ret && cc->state != CC33XX_STATE_OFF)
+		set_bit(CC33XX_FLAG_IO_FAILED, &cc->flags);
+
+	return ret;
+}
+
+int __must_check cc33xx_write(struct cc33xx *cc, int addr,
+			      void *buf, size_t len, bool fixed)
+{
+	return cc33xx_raw_write(cc, addr, buf, len, fixed);
+}
+
+void claim_core_status_lock(struct cc33xx *cc)
+{
+	/* When accessing core-status data (read or write) the transport lock
+	 * should be held.
+	 */
+	cc->if_ops->interface_claim(cc->dev);
+}
+
+void release_core_status_lock(struct cc33xx *cc)
+{
+	/* After accessing core-status data (read or write) the transport lock
+	 * should be released.
+	 */
+	cc->if_ops->interface_release(cc->dev);
+}
+
+void cc33xx_power_off(struct cc33xx *cc)
+{
+	int ret = 0;
+
+	if (!test_bit(CC33XX_FLAG_GPIO_POWER, &cc->flags))
+		return;
+
+	if (cc->if_ops->power)
+		ret = cc->if_ops->power(cc->dev, false);
+	if (!ret)
+		clear_bit(CC33XX_FLAG_GPIO_POWER, &cc->flags);
+}
+
+int cc33xx_power_on(struct cc33xx *cc)
+{
+	int ret = 0;
+
+	if (cc->if_ops->power)
+		ret = cc->if_ops->power(cc->dev, true);
+	if (ret == 0)
+		set_bit(CC33XX_FLAG_GPIO_POWER, &cc->flags);
+
+	return ret;
+}
diff --git a/drivers/net/wireless/ti/cc33xx/io.h b/drivers/net/wireless/ti/cc33xx/io.h
new file mode 100644
index 000000000000..cc5abd428d99
--- /dev/null
+++ b/drivers/net/wireless/ti/cc33xx/io.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (C) 2022-2024 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+#ifndef __IO_H__
+#define __IO_H__
+
+struct cc33xx;
+
+void cc33xx_disable_interrupts_nosync(struct cc33xx *cc);
+void cc33xx_enable_interrupts(struct cc33xx *cc);
+void cc33xx_io_reset(struct cc33xx *cc);
+void cc33xx_io_init(struct cc33xx *cc);
+int __must_check cc33xx_raw_read(struct cc33xx *cc, int addr,
+				 void *buf, size_t len, bool fixed);
+int __must_check cc33xx_write(struct cc33xx *cc, int addr,
+			      void *buf, size_t len, bool fixed);
+void claim_core_status_lock(struct cc33xx *cc);
+void release_core_status_lock(struct cc33xx *cc);
+void cc33xx_power_off(struct cc33xx *cc);
+int cc33xx_power_on(struct cc33xx *cc);
+int cc33xx_translate_addr(struct cc33xx *cc, int addr);
+bool cc33xx_set_block_size(struct cc33xx *cc);
+
+#endif /* __IO_H__ */
diff --git a/drivers/net/wireless/ti/cc33xx/sdio.c b/drivers/net/wireless/ti/cc33xx/sdio.c
new file mode 100644
index 000000000000..3d41bba459c8
--- /dev/null
+++ b/drivers/net/wireless/ti/cc33xx/sdio.c
@@ -0,0 +1,530 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022-2024 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+#include <linux/mmc/sdio_func.h>
+#include <linux/mmc/host.h>
+#include <linux/gpio.h>
+#include <linux/pm_runtime.h>
+#include <linux/of_irq.h>
+
+#include "cc33xx.h"
+#include "io.h"
+
+#ifndef SDIO_VENDOR_ID_TI
+#define SDIO_VENDOR_ID_TI		0x0097
+#endif
+
+#define SDIO_DEVICE_ID_CC33XX_NO_EFUSE	0x4076
+#define SDIO_DEVICE_ID_TI_CC33XX	0x4077
+
+struct cc33xx_sdio_glue {
+	struct device *dev;
+	struct platform_device *core;
+};
+
+static void cc33xx_sdio_claim(struct device *child)
+{
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct sdio_func *func = dev_to_sdio_func(glue->dev);
+
+	sdio_claim_host(func);
+}
+
+static void cc33xx_sdio_release(struct device *child)
+{
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct sdio_func *func = dev_to_sdio_func(glue->dev);
+
+	sdio_release_host(func);
+}
+
+static void cc33xx_sdio_set_block_size(struct device *child,
+				       unsigned int blksz)
+{
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct sdio_func *func = dev_to_sdio_func(glue->dev);
+
+	sdio_claim_host(func);
+	sdio_set_block_size(func, blksz);
+	sdio_release_host(func);
+}
+
+static int __must_check cc33xx_sdio_raw_read(struct device *child, int addr,
+					     void *buf, size_t len, bool fixed)
+{
+	int ret;
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct sdio_func *func = dev_to_sdio_func(glue->dev);
+
+	sdio_claim_host(func);
+
+	if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
+		((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret);
+		dev_dbg(child->parent, "sdio read 52 addr 0x%x, byte 0x%02x\n",
+			addr, ((u8 *)buf)[0]);
+	} else {
+		if (fixed)
+			ret = sdio_readsb(func, buf, addr, len);
+		else
+			ret = sdio_memcpy_fromio(func, buf, addr, len);
+
+		dev_dbg(child->parent, "sdio read 53 addr 0x%x, %zu bytes\n",
+			addr, len);
+	}
+
+	sdio_release_host(func);
+
+	if (WARN_ON(ret))
+		dev_err(child->parent, "sdio read failed (%d)\n", ret);
+
+	return ret;
+}
+
+static int __must_check cc33xx_sdio_raw_write(struct device *child, int addr,
+					      void *buf, size_t len, bool fixed)
+{
+	int ret;
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct sdio_func *func = dev_to_sdio_func(glue->dev);
+
+	sdio_claim_host(func);
+
+	if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
+		sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret);
+	} else {
+		if (fixed)
+			ret = sdio_writesb(func, addr, buf, len);
+		else
+			ret = sdio_memcpy_toio(func, addr, buf, len);
+	}
+
+	sdio_release_host(func);
+
+	if (WARN_ON(ret))
+		dev_err(child->parent, "sdio write failed (%d)\n", ret);
+
+	return ret;
+}
+
+static int cc33xx_sdio_power_on(struct cc33xx_sdio_glue *glue)
+{
+	int ret;
+	struct sdio_func *func = dev_to_sdio_func(glue->dev);
+	struct mmc_card *card = func->card;
+
+	ret = pm_runtime_get_sync(&card->dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(&card->dev);
+		dev_err(glue->dev, "%s: failed to get_sync(%d)\n",
+			__func__, ret);
+
+		return ret;
+	}
+
+	sdio_claim_host(func);
+	sdio_enable_func(func);
+	sdio_release_host(func);
+
+	return 0;
+}
+
+static int cc33xx_sdio_power_off(struct cc33xx_sdio_glue *glue)
+{
+	struct sdio_func *func = dev_to_sdio_func(glue->dev);
+	struct mmc_card *card = func->card;
+
+	sdio_claim_host(func);
+	sdio_disable_func(func);
+	sdio_release_host(func);
+
+	/* Let runtime PM know the card is powered off */
+	pm_runtime_put(&card->dev);
+	return 0;
+}
+
+static int cc33xx_sdio_set_power(struct device *child, bool enable)
+{
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+
+	if (enable)
+		return cc33xx_sdio_power_on(glue);
+	else
+		return cc33xx_sdio_power_off(glue);
+}
+
+/**
+ *	inband_irq_handler - Called from the MMC subsystem when the
+ *	function's IRQ is signaled.
+ *	@func: an SDIO function of the card
+ *
+ *	Note that the host is already claimed when handler is invoked.
+ */
+static void inband_irq_handler(struct sdio_func *func)
+{
+	struct cc33xx_sdio_glue *glue = sdio_get_drvdata(func);
+	struct platform_device *pdev = glue->core;
+	struct cc33xx_platdev_data *pdev_data = dev_get_platdata(&pdev->dev);
+
+	if (WARN_ON(!pdev_data->irq_handler))
+		return;
+
+	pdev_data->irq_handler(pdev);
+}
+
+static void cc33xx_enable_async_interrupt(struct sdio_func *func)
+{
+	u8 reg_val;
+	const int CCCR_REG_16_ADDR = 0x16;
+	const int ENABLE_ASYNC_IRQ_BIT = BIT(1);
+
+	reg_val = sdio_f0_readb(func, CCCR_REG_16_ADDR, NULL);
+	reg_val |= ENABLE_ASYNC_IRQ_BIT;
+	sdio_f0_writeb(func, reg_val, CCCR_REG_16_ADDR, NULL);
+}
+
+static void cc33xx_sdio_enable_irq(struct device *child)
+{
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct sdio_func *func = dev_to_sdio_func(glue->dev);
+
+	sdio_claim_host(func);
+	cc33xx_enable_async_interrupt(func);
+	sdio_claim_irq(func, inband_irq_handler);
+	sdio_release_host(func);
+}
+
+static void cc33xx_sdio_disable_irq(struct device *child)
+{
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct sdio_func *func = dev_to_sdio_func(glue->dev);
+
+	sdio_claim_host(func);
+	sdio_release_irq(func);
+	sdio_release_host(func);
+}
+
+static void cc33xx_enable_line_irq(struct device *child)
+{
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct platform_device *pdev = glue->core;
+	struct cc33xx_platdev_data *pdev_data = dev_get_platdata(&pdev->dev);
+
+	enable_irq(pdev_data->gpio_irq_num);
+}
+
+static void cc33xx_disable_line_irq(struct device *child)
+{
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct platform_device *pdev = glue->core;
+	struct cc33xx_platdev_data *pdev_data = dev_get_platdata(&pdev->dev);
+
+	disable_irq_nosync(pdev_data->gpio_irq_num);
+}
+
+static void cc33xx_set_irq_handler(struct device *child, void *handler)
+{
+	struct cc33xx_sdio_glue *glue = dev_get_drvdata(child->parent);
+	struct platform_device *pdev = glue->core;
+	struct cc33xx_platdev_data *pdev_data = dev_get_platdata(&pdev->dev);
+
+	pdev_data->irq_handler = handler;
+}
+
+static const struct cc33xx_if_operations sdio_ops_gpio_irq = {
+	.interface_claim	= cc33xx_sdio_claim,
+	.interface_release	= cc33xx_sdio_release,
+	.read			= cc33xx_sdio_raw_read,
+	.write			= cc33xx_sdio_raw_write,
+	.power			= cc33xx_sdio_set_power,
+	.set_block_size	= cc33xx_sdio_set_block_size,
+	.set_irq_handler	= cc33xx_set_irq_handler,
+	.disable_irq		= cc33xx_disable_line_irq,
+	.enable_irq		= cc33xx_enable_line_irq,
+};
+
+static const struct cc33xx_if_operations sdio_ops_inband_irq = {
+	.interface_claim	= cc33xx_sdio_claim,
+	.interface_release	= cc33xx_sdio_release,
+	.read			= cc33xx_sdio_raw_read,
+	.write			= cc33xx_sdio_raw_write,
+	.power			= cc33xx_sdio_set_power,
+	.set_block_size	= cc33xx_sdio_set_block_size,
+	.set_irq_handler	= cc33xx_set_irq_handler,
+	.disable_irq		= cc33xx_sdio_disable_irq,
+	.enable_irq		= cc33xx_sdio_enable_irq,
+};
+
+#ifdef CONFIG_OF
+static const struct cc33xx_family_data cc33xx_data = {
+	.name = "cc33xx",
+	.cfg_name = "ti-connectivity/cc33xx-conf.bin",
+	.nvs_name = "ti-connectivity/cc33xx-nvs.bin",
+};
+
+static const struct of_device_id cc33xx_sdio_of_match_table[] = {
+	{ .compatible = "ti,cc33xx", .data = &cc33xx_data },
+	{ }
+};
+
+static int cc33xx_probe_of(struct device *dev, int *irq, int *wakeirq,
+			   struct cc33xx_platdev_data *pdev_data)
+{
+	struct device_node *np = dev->of_node;
+	const struct of_device_id *of_id;
+
+	of_id = of_match_node(cc33xx_sdio_of_match_table, np);
+	if (!of_id)
+		return -ENODEV;
+
+	pdev_data->family = of_id->data;
+
+	*irq = irq_of_parse_and_map(np, 0);
+
+	*wakeirq = irq_of_parse_and_map(np, 1);
+
+	return 0;
+}
+#else
+static int cc33xx_probe_of(struct device *dev, int *irq, int *wakeirq,
+			   struct cc33xx_platdev_data *pdev_data)
+{
+	return -ENODATA;
+}
+#endif /* CONFIG_OF */
+
+static irqreturn_t gpio_irq_hard_handler(int irq, void *cookie)
+{
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t gpio_irq_thread_handler(int irq, void *cookie)
+{
+	struct sdio_func *func = cookie;
+	struct cc33xx_sdio_glue *glue = sdio_get_drvdata(func);
+	struct platform_device *pdev = glue->core;
+	struct cc33xx_platdev_data *pdev_data = dev_get_platdata(&pdev->dev);
+
+	if (WARN_ON(!pdev_data->irq_handler))
+		return IRQ_HANDLED;
+
+	pdev_data->irq_handler(pdev);
+
+	return IRQ_HANDLED;
+}
+
+static int sdio_cc33xx_probe(struct sdio_func *func,
+			     const struct sdio_device_id *id)
+{
+	struct cc33xx_platdev_data *pdev_data;
+	struct cc33xx_sdio_glue *glue;
+	struct resource res[1];
+	mmc_pm_flag_t mmcflags;
+	int ret = -ENOMEM;
+	int gpio_irq, wakeirq, irq_flags;
+
+	/* We are only able to handle the wlan function */
+	if (func->num != 0x02)
+		return -ENODEV;
+
+	pdev_data = devm_kzalloc(&func->dev, sizeof(*pdev_data), GFP_KERNEL);
+	if (!pdev_data)
+		return -ENOMEM;
+
+	glue = devm_kzalloc(&func->dev, sizeof(*glue), GFP_KERNEL);
+	if (!glue)
+		return -ENOMEM;
+
+	glue->dev = &func->dev;
+
+	/* Grab access to FN0 for ELP reg. */
+	func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
+
+	/* Use block mode for transferring over one block size of data */
+	func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
+
+	ret = cc33xx_probe_of(&func->dev, &gpio_irq, &wakeirq, pdev_data);
+	if (ret)
+		goto out;
+
+	/* if sdio can keep power while host is suspended, enable wow */
+	mmcflags = sdio_get_host_pm_caps(func);
+
+	sdio_set_drvdata(func, glue);
+
+	/* Tell PM core that we don't need the card to be powered now */
+	pm_runtime_put_noidle(&func->dev);
+
+	glue->core = platform_device_alloc("cc33xx", PLATFORM_DEVID_AUTO);
+	if (!glue->core) {
+		dev_err(glue->dev, "can't allocate platform_device");
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	glue->core->dev.parent = &func->dev;
+
+	if (gpio_irq) {
+		irq_flags = irqd_get_trigger_type(irq_get_irq_data(gpio_irq));
+
+		irq_set_status_flags(gpio_irq, IRQ_NOAUTOEN);
+
+		if (irq_flags & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW))
+			irq_flags |= IRQF_ONESHOT;
+
+		ret = request_threaded_irq(gpio_irq, gpio_irq_hard_handler,
+					   gpio_irq_thread_handler,
+					   irq_flags, glue->core->name, func);
+		if (ret) {
+			dev_err(glue->dev, "can't register GPIO IRQ handler\n");
+			goto out_dev_put;
+		}
+
+		pdev_data->gpio_irq_num = gpio_irq;
+
+		if ((mmcflags & MMC_PM_KEEP_POWER) &&
+		    (enable_irq_wake(gpio_irq) == 0))
+			pdev_data->pwr_in_suspend = true;
+
+		pdev_data->if_ops = &sdio_ops_gpio_irq;
+	} else {
+		pdev_data->if_ops = &sdio_ops_inband_irq;
+	}
+
+	if (wakeirq > 0) {
+		res[0].start = wakeirq;
+		res[0].flags = IORESOURCE_IRQ |
+			irqd_get_trigger_type(irq_get_irq_data(wakeirq));
+		res[0].name = "wakeirq";
+
+		ret = platform_device_add_resources(glue->core, res, 1);
+		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 add platform device\n");
+		goto out_dev_put;
+	}
+	return 0;
+
+out_dev_put:
+	platform_device_put(glue->core);
+
+	if (pdev_data->gpio_irq_num)
+		free_irq(pdev_data->gpio_irq_num, func);
+
+out:
+	return ret;
+}
+
+static void sdio_cc33xx_remove(struct sdio_func *func)
+{
+	struct cc33xx_sdio_glue *glue = sdio_get_drvdata(func);
+	struct platform_device *pdev = glue->core;
+	struct cc33xx_platdev_data *pdev_data = dev_get_platdata(&pdev->dev);
+
+	/* Undo decrement done above in sdio_cc33xx_probe */
+	pm_runtime_get_noresume(&func->dev);
+
+	platform_device_unregister(glue->core);
+
+	if (pdev_data->gpio_irq_num) {
+		free_irq(pdev_data->gpio_irq_num, func);
+		if (pdev_data->pwr_in_suspend)
+			disable_irq_wake(pdev_data->gpio_irq_num);
+	} else {
+		sdio_claim_host(func);
+		sdio_release_irq(func);
+		sdio_release_host(func);
+	}
+}
+
+#ifdef CONFIG_PM
+static int cc33xx_suspend(struct device *dev)
+{
+	/* Tell MMC/SDIO core it's OK to power down the card
+	 * (if it isn't already), but not to remove it completely
+	 */
+	struct sdio_func *func = dev_to_sdio_func(dev);
+	struct cc33xx_sdio_glue *glue = sdio_get_drvdata(func);
+	struct cc33xx *cc = platform_get_drvdata(glue->core);
+	mmc_pm_flag_t sdio_flags;
+	int ret = 0;
+
+	if (!cc) {
+		dev_err(dev, "no wilink module was probed\n");
+		goto out;
+	}
+
+	dev_dbg(dev, "cc33xx suspend. keep_device_power: %d\n",
+		cc->keep_device_power);
+
+	if (cc->keep_device_power) {
+		sdio_flags = sdio_get_host_pm_caps(func);
+
+		if (!(sdio_flags & MMC_PM_KEEP_POWER)) {
+			dev_err(dev, "can't keep power while host is suspended\n");
+			ret = -EINVAL;
+			goto out;
+		}
+
+		/* keep power while host suspended */
+		ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
+		if (ret) {
+			dev_err(dev, "error while trying to keep power\n");
+			goto out;
+		}
+	}
+out:
+	return ret;
+}
+
+static int cc33xx_resume(struct device *dev)
+{
+	return 0;
+}
+
+static const struct dev_pm_ops cc33xx_sdio_pm_ops = {
+	.suspend	= cc33xx_suspend,
+	.resume		= cc33xx_resume,
+};
+#endif
+
+static const struct sdio_device_id cc33xx_devices[] = {
+	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_CC33XX) },
+	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_CC33XX_NO_EFUSE) },
+	{}
+};
+
+static struct sdio_driver cc33xx_sdio_driver = {
+	.name		= "cc33xx_sdio",
+	.id_table	= cc33xx_devices,
+	.probe		= sdio_cc33xx_probe,
+	.remove		= sdio_cc33xx_remove,
+#ifdef CONFIG_PM
+	.drv = {
+		.pm = &cc33xx_sdio_pm_ops,
+	},
+#endif /* CONFIG_PM */
+};
+
+MODULE_DEVICE_TABLE(sdio, cc33xx_devices);
+
+module_sdio_driver(cc33xx_sdio_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("SDIO transport for Texas Instruments CC33xx WLAN driver");
+MODULE_AUTHOR("Michael Nemanov <michael.nemanov@...com>");
+MODULE_AUTHOR("Sabeeh Khan <sabeeh-khan@...com>");
-- 
2.34.1

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