1 files changed, 353 insertions, 0 deletions

diff --git a/drivers/net/wireless/ti/wl1251/sdio.c b/drivers/net/wireless/ti/wl1251/sdio.c
new file mode 100644
index 000000000..c9a4e9a43
--- /dev/null
+++ b/drivers/net/wireless/ti/wl1251/sdio.c
@@ -0,0 +1,353 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * wl12xx SDIO routines
+ *
+ * Copyright (C) 2005 Texas Instruments Incorporated
+ * Copyright (C) 2008 Google Inc
+ * Copyright (C) 2009 Bob Copeland (me@bobcopeland.com)
+ */
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mmc/sdio_func.h>
+#include <linux/mmc/sdio_ids.h>
+#include <linux/platform_device.h>
+#include <linux/wl12xx.h>
+#include <linux/irq.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+
+#include "wl1251.h"
+
+struct wl1251_sdio {
+	struct sdio_func *func;
+	u32 elp_val;
+};
+
+static struct sdio_func *wl_to_func(struct wl1251 *wl)
+{
+	struct wl1251_sdio *wl_sdio = wl->if_priv;
+	return wl_sdio->func;
+}
+
+static void wl1251_sdio_interrupt(struct sdio_func *func)
+{
+	struct wl1251 *wl = sdio_get_drvdata(func);
+
+	wl1251_debug(DEBUG_IRQ, "IRQ");
+
+	/* FIXME should be synchronous for sdio */
+	ieee80211_queue_work(wl->hw, &wl->irq_work);
+}
+
+static const struct sdio_device_id wl1251_devices[] = {
+	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI_WL1251, SDIO_DEVICE_ID_TI_WL1251) },
+	{}
+};
+MODULE_DEVICE_TABLE(sdio, wl1251_devices);
+
+
+static void wl1251_sdio_read(struct wl1251 *wl, int addr,
+			     void *buf, size_t len)
+{
+	int ret;
+	struct sdio_func *func = wl_to_func(wl);
+
+	sdio_claim_host(func);
+	ret = sdio_memcpy_fromio(func, buf, addr, len);
+	if (ret)
+		wl1251_error("sdio read failed (%d)", ret);
+	sdio_release_host(func);
+}
+
+static void wl1251_sdio_write(struct wl1251 *wl, int addr,
+			      void *buf, size_t len)
+{
+	int ret;
+	struct sdio_func *func = wl_to_func(wl);
+
+	sdio_claim_host(func);
+	ret = sdio_memcpy_toio(func, addr, buf, len);
+	if (ret)
+		wl1251_error("sdio write failed (%d)", ret);
+	sdio_release_host(func);
+}
+
+static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
+{
+	int ret = 0;
+	struct wl1251_sdio *wl_sdio = wl->if_priv;
+	struct sdio_func *func = wl_sdio->func;
+
+	/*
+	 * The hardware only supports RAW (read after write) access for
+	 * reading, regular sdio_readb won't work here (it interprets
+	 * the unused bits of CMD52 as write data even if we send read
+	 * request).
+	 */
+	sdio_claim_host(func);
+	*val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
+	sdio_release_host(func);
+
+	if (ret)
+		wl1251_error("sdio_readb failed (%d)", ret);
+}
+
+static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
+{
+	int ret = 0;
+	struct wl1251_sdio *wl_sdio = wl->if_priv;
+	struct sdio_func *func = wl_sdio->func;
+
+	sdio_claim_host(func);
+	sdio_writeb(func, val, addr, &ret);
+	sdio_release_host(func);
+
+	if (ret)
+		wl1251_error("sdio_writeb failed (%d)", ret);
+	else
+		wl_sdio->elp_val = val;
+}
+
+static void wl1251_sdio_reset(struct wl1251 *wl)
+{
+}
+
+static void wl1251_sdio_enable_irq(struct wl1251 *wl)
+{
+	struct sdio_func *func = wl_to_func(wl);
+
+	sdio_claim_host(func);
+	sdio_claim_irq(func, wl1251_sdio_interrupt);
+	sdio_release_host(func);
+}
+
+static void wl1251_sdio_disable_irq(struct wl1251 *wl)
+{
+	struct sdio_func *func = wl_to_func(wl);
+
+	sdio_claim_host(func);
+	sdio_release_irq(func);
+	sdio_release_host(func);
+}
+
+/* Interrupts when using dedicated WLAN_IRQ pin */
+static irqreturn_t wl1251_line_irq(int irq, void *cookie)
+{
+	struct wl1251 *wl = cookie;
+
+	ieee80211_queue_work(wl->hw, &wl->irq_work);
+
+	return IRQ_HANDLED;
+}
+
+static void wl1251_enable_line_irq(struct wl1251 *wl)
+{
+	return enable_irq(wl->irq);
+}
+
+static void wl1251_disable_line_irq(struct wl1251 *wl)
+{
+	return disable_irq(wl->irq);
+}
+
+static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
+{
+	struct sdio_func *func = wl_to_func(wl);
+	int ret;
+
+	if (enable) {
+		ret = pm_runtime_get_sync(&func->dev);
+		if (ret < 0) {
+			pm_runtime_put_sync(&func->dev);
+			goto out;
+		}
+
+		sdio_claim_host(func);
+		sdio_enable_func(func);
+		sdio_release_host(func);
+	} else {
+		sdio_claim_host(func);
+		sdio_disable_func(func);
+		sdio_release_host(func);
+
+		ret = pm_runtime_put_sync(&func->dev);
+		if (ret < 0)
+			goto out;
+	}
+
+out:
+	return ret;
+}
+
+static struct wl1251_if_operations wl1251_sdio_ops = {
+	.read = wl1251_sdio_read,
+	.write = wl1251_sdio_write,
+	.write_elp = wl1251_sdio_write_elp,
+	.read_elp = wl1251_sdio_read_elp,
+	.reset = wl1251_sdio_reset,
+	.power = wl1251_sdio_set_power,
+};
+
+static int wl1251_sdio_probe(struct sdio_func *func,
+			     const struct sdio_device_id *id)
+{
+	int ret;
+	struct wl1251 *wl;
+	struct ieee80211_hw *hw;
+	struct wl1251_sdio *wl_sdio;
+	const struct wl1251_platform_data *wl1251_board_data;
+	struct device_node *np = func->dev.of_node;
+
+	hw = wl1251_alloc_hw();
+	if (IS_ERR(hw))
+		return PTR_ERR(hw);
+
+	wl = hw->priv;
+
+	wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
+	if (wl_sdio == NULL) {
+		ret = -ENOMEM;
+		goto out_free_hw;
+	}
+
+	sdio_claim_host(func);
+	ret = sdio_enable_func(func);
+	if (ret)
+		goto release;
+
+	sdio_set_block_size(func, 512);
+	sdio_release_host(func);
+
+	SET_IEEE80211_DEV(hw, &func->dev);
+	wl_sdio->func = func;
+	wl->if_priv = wl_sdio;
+	wl->if_ops = &wl1251_sdio_ops;
+
+	wl1251_board_data = wl1251_get_platform_data();
+	if (!IS_ERR(wl1251_board_data)) {
+		wl->irq = wl1251_board_data->irq;
+		wl->use_eeprom = wl1251_board_data->use_eeprom;
+	} else if (np) {
+		wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
+		wl->irq = of_irq_get(np, 0);
+		if (wl->irq == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto disable;
+		}
+	}
+
+	if (wl->irq) {
+		irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
+		ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
+		if (ret < 0) {
+			wl1251_error("request_irq() failed: %d", ret);
+			goto disable;
+		}
+
+		irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
+
+		wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
+		wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
+
+		wl1251_info("using dedicated interrupt line");
+	} else {
+		wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
+		wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
+
+		wl1251_info("using SDIO interrupt");
+	}
+
+	ret = wl1251_init_ieee80211(wl);
+	if (ret)
+		goto out_free_irq;
+
+	sdio_set_drvdata(func, wl);
+
+	/* Tell PM core that we don't need the card to be powered now */
+	pm_runtime_put_noidle(&func->dev);
+
+	return ret;
+
+out_free_irq:
+	if (wl->irq)
+		free_irq(wl->irq, wl);
+disable:
+	sdio_claim_host(func);
+	sdio_disable_func(func);
+release:
+	sdio_release_host(func);
+	kfree(wl_sdio);
+out_free_hw:
+	wl1251_free_hw(wl);
+	return ret;
+}
+
+static void wl1251_sdio_remove(struct sdio_func *func)
+{
+	struct wl1251 *wl = sdio_get_drvdata(func);
+	struct wl1251_sdio *wl_sdio = wl->if_priv;
+
+	/* Undo decrement done above in wl1251_probe */
+	pm_runtime_get_noresume(&func->dev);
+
+	if (wl->irq)
+		free_irq(wl->irq, wl);
+	wl1251_free_hw(wl);
+	kfree(wl_sdio);
+
+	sdio_claim_host(func);
+	sdio_release_irq(func);
+	sdio_disable_func(func);
+	sdio_release_host(func);
+}
+
+static int wl1251_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.
+	 */
+	return 0;
+}
+
+static int wl1251_resume(struct device *dev)
+{
+	return 0;
+}
+
+static const struct dev_pm_ops wl1251_sdio_pm_ops = {
+	.suspend        = wl1251_suspend,
+	.resume         = wl1251_resume,
+};
+
+static struct sdio_driver wl1251_sdio_driver = {
+	.name		= "wl1251_sdio",
+	.id_table	= wl1251_devices,
+	.probe		= wl1251_sdio_probe,
+	.remove		= wl1251_sdio_remove,
+	.drv.pm		= &wl1251_sdio_pm_ops,
+};
+
+static int __init wl1251_sdio_init(void)
+{
+	int err;
+
+	err = sdio_register_driver(&wl1251_sdio_driver);
+	if (err)
+		wl1251_error("failed to register sdio driver: %d", err);
+	return err;
+}
+
+static void __exit wl1251_sdio_exit(void)
+{
+	sdio_unregister_driver(&wl1251_sdio_driver);
+	wl1251_notice("unloaded");
+}
+
+module_init(wl1251_sdio_init);
+module_exit(wl1251_sdio_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");