The patch contains SDIO wrapper for the cw1200 wireless driver.
The wrapper instantiates driver's core and implements common sbus
interface for the core.
Signed-off-by: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
---
drivers/staging/cw1200/cw1200_sdio.c | 493 ++++++++++++++++++++++++++++++++++
1 files changed, 493 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/cw1200/cw1200_sdio.c
diff --git a/drivers/staging/cw1200/cw1200_sdio.c b/drivers/staging/cw1200/cw1200_sdio.c
new file mode 100644
index 0000000..dfa7e64
--- /dev/null
+++ b/drivers/staging/cw1200/cw1200_sdio.c
@@ -0,0 +1,493 @@
+/*
+ * Mac80211 SDIO driver for ST-Ericsson CW1200 device
+ *
+ * Copyright (c) 2010, ST-Ericsson
+ * Author: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
+ *
+ * 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 <linux/spinlock.h>
+#include <net/mac80211.h>
+
+#include "cw1200.h"
+#include "sbus.h"
+#include "cw1200_plat.h"
+
+MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("cw1200_wlan");
+
+#if defined(CONFIG_CW1200_STANDALONE)
+static char cw1200_mmc_id[10];
+module_param_string(mmc_id, cw1200_mmc_id, sizeof(cw1200_mmc_id), 0);
+#endif /* CONFIG_CW1200_STANDALONE */
+
+struct sbus_priv {
+ struct sdio_func *func;
+ struct cw1200_common *core;
+ const struct cw1200_platform_data *pdata;
+ spinlock_t lock;
+ sbus_irq_handler irq_handler;
+ void *irq_priv;
+};
+
+static const struct sdio_device_id cw1200_sdio_ids[] = {
+ { SDIO_DEVICE(SDIO_ANY_ID, SDIO_ANY_ID) },
+ { /* 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);
+}
+
+#ifndef CONFIG_CW1200_USE_GPIO_IRQ
+static void cw1200_sdio_irq_handler(struct sdio_func *func)
+{
+ struct sbus_priv *self = sdio_get_drvdata(func);
+ unsigned long flags;
+
+ BUG_ON(!self);
+ spin_lock_irqsave(&self->lock, flags);
+ if (self->irq_handler)
+ self->irq_handler(self->irq_priv);
+ spin_unlock_irqrestore(&self->lock, flags);
+}
+#else /* CONFIG_CW1200_USE_GPIO_IRQ */
+static irqreturn_t cw1200_gpio_irq_handler(int irq, void *dev_id)
+{
+ struct sbus_priv *self = dev_id;
+
+ BUG_ON(!self);
+ if (self->irq_handler)
+ self->irq_handler(self->irq_priv);
+ return IRQ_HANDLED;
+}
+
+static int cw1200_request_irq(struct sbus_priv *self,
+ irq_handler_t handler)
+{
+ int ret;
+ int func_num;
+ const struct resource *irq = self->pdata->irq;
+ u8 cccr;
+
+ if (!irq)
+ return -EINVAL;
+
+ ret = request_any_context_irq(irq->start, handler,
+ IRQF_TRIGGER_RISING, irq->name, self);
+ if (WARN_ON(ret < 0))
+ goto exit;
+
+ /* Hack to access Fuction-0 */
+ func_num = self->func->num;
+ self->func->num = 0;
+
+ cccr = sdio_readb(self->func, SDIO_CCCR_IENx, &ret);
+ if (WARN_ON(ret))
+ goto set_func;
+
+ /* Master interrupt enable ... */
+ cccr |= BIT(0);
+
+ /* ... for our function */
+ cccr |= BIT(func_num);
+
+ sdio_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret);
+ if (WARN_ON(ret))
+ goto set_func;
+
+ /* Restore the WLAN function number */
+ self->func->num = func_num;
+ return 0;
+
+set_func:
+ self->func->num = func_num;
+ free_irq(irq->start, self);
+exit:
+ return ret;
+}
+#endif /* CONFIG_CW1200_USE_GPIO_IRQ */
+
+static int cw1200_sdio_irq_subscribe(struct sbus_priv *self,
+ sbus_irq_handler handler,
+ void *priv)
+{
+ int ret;
+ unsigned long flags;
+
+ if (!handler)
+ return -EINVAL;
+
+ spin_lock_irqsave(&self->lock, flags);
+ self->irq_priv = priv;
+ self->irq_handler = handler;
+ spin_unlock_irqrestore(&self->lock, flags);
+
+ printk(KERN_DEBUG "SW IRQ subscribe\n");
+ sdio_claim_host(self->func);
+#ifndef CONFIG_CW1200_USE_GPIO_IRQ
+ ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler);
+#else
+ ret = cw1200_request_irq(self, cw1200_gpio_irq_handler);
+#endif
+ sdio_release_host(self->func);
+ return ret;
+}
+
+static int cw1200_sdio_irq_unsubscribe(struct sbus_priv *self)
+{
+ int ret = 0;
+ unsigned long flags;
+#ifdef CONFIG_CW1200_USE_GPIO_IRQ
+ const struct resource *irq = self->pdata->irq;
+
+ if (!irq)
+ return -EINVAL;
+#endif
+
+ WARN_ON(!self->irq_handler);
+ if (!self->irq_handler)
+ return 0;
+
+ printk(KERN_DEBUG "SW IRQ unsubscribe\n");
+#ifndef CONFIG_CW1200_USE_GPIO_IRQ
+ sdio_claim_host(self->func);
+ ret = sdio_release_irq(self->func);
+ sdio_release_host(self->func);
+#else
+ free_irq(irq->start, self);
+#endif
+
+ spin_lock_irqsave(&self->lock, flags);
+ self->irq_priv = NULL;
+ self->irq_handler = NULL;
+ spin_unlock_irqrestore(&self->lock, flags);
+
+ return ret;
+}
+
+static int cw1200_detect_card(const struct cw1200_platform_data *pdata)
+{
+ /* HACK!!!
+ * Rely on mmc->class_dev.class set in mmc_alloc_host
+ * Tricky part: a new mmc hook is being (temporary) created
+ * to discover mmc_host class.
+ * Do you know more elegant way how to enumerate mmc_hosts?
+ */
+
+ struct mmc_host *mmc = NULL;
+ struct class_dev_iter iter;
+ struct device *dev;
+
+ mmc = mmc_alloc_host(0, NULL);
+ if (!mmc)
+ return -ENOMEM;
+
+ BUG_ON(!mmc->class_dev.class);
+ class_dev_iter_init(&iter, mmc->class_dev.class, NULL, NULL);
+ for (;;) {
+ dev = class_dev_iter_next(&iter);
+ if (!dev) {
+ printk(KERN_ERR "cw1200: %s is not found.\n",
+ pdata->mmc_id);
+ break;
+ } else {
+ struct mmc_host *host = container_of(dev,
+ struct mmc_host, class_dev);
+
+ if (dev_name(&host->class_dev) &&
+ strcmp(dev_name(&host->class_dev),
+ pdata->mmc_id))
+ continue;
+
+ mmc_detect_change(host, 10);
+ break;
+ }
+ }
+ mmc_free_host(mmc);
+ return 0;
+}
+
+static int cw1200_sdio_off(const struct cw1200_platform_data *pdata)
+{
+ int ret = 0;
+#ifndef CONFIG_CW1200_U5500_SUPPORT
+ const struct resource *reset = pdata->reset;
+ if (reset) {
+ gpio_set_value(reset->start, 0);
+ gpio_free(reset->start);
+ }
+#else
+ if (pdata->prcmu_ctrl)
+ ret = pdata->prcmu_ctrl(pdata, false);
+ msleep(50);
+#endif
+ cw1200_detect_card(pdata);
+ return ret;
+}
+
+static int cw1200_sdio_on(const struct cw1200_platform_data *pdata)
+{
+ int ret = 0;
+#ifndef CONFIG_CW1200_U5500_SUPPORT
+ const struct resource *reset = pdata->reset;
+ if (reset) {
+ gpio_request(reset->start, reset->name);
+ gpio_direction_output(reset->start, 1);
+ /* It is not stated in the datasheet, but at least some
+ * of devices have problems with reset if this stage
+ * is omited. */
+ msleep(50);
+ gpio_direction_output(reset->start, 0);
+ /* A valid reset shall be obtained by maintaining WRESETN
+ * active (low) for at least two cycles of LP_CLK after VDDIO
+ * is stable within it operating range. */
+ usleep_range(1000, 20000);
+ gpio_set_value(reset->start, 1);
+ /* The host should wait 32 ms after the WRESETN release
+ * for the on-chip LDO to stabilize */
+ msleep(32);
+ }
+#else
+ if (pdata->prcmu_ctrl)
+ ret = pdata->prcmu_ctrl(pdata, true);
+ msleep(50);
+#endif
+ cw1200_detect_card(pdata);
+ return ret;
+}
+
+static int cw1200_sdio_reset(struct sbus_priv *self)
+{
+ cw1200_sdio_off(self->pdata);
+ msleep(1000);
+ cw1200_sdio_on(self->pdata);
+ return 0;
+}
+
+static size_t cw1200_sdio_align_size(struct sbus_priv *self, size_t size)
+{
+ size_t aligned = sdio_align_size(self->func, size);
+ return aligned;
+}
+
+int cw1200_sdio_set_block_size(struct sbus_priv *self, size_t size)
+{
+ return sdio_set_block_size(self->func, size);
+}
+
+static int cw1200_sdio_pm(struct sbus_priv *self, bool suspend)
+{
+ int ret = 0;
+ const struct resource *irq = self->pdata->irq;
+
+ if (irq)
+ ret = irq_set_irq_wake(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,
+ .irq_subscribe = cw1200_sdio_irq_subscribe,
+ .irq_unsubscribe = cw1200_sdio_irq_unsubscribe,
+ .reset = cw1200_sdio_reset,
+ .align_size = cw1200_sdio_align_size,
+ .power_mgmt = cw1200_sdio_pm,
+ .set_block_size = cw1200_sdio_set_block_size,
+};
+
+/* 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;
+
+ cw1200_dbg(CW1200_DBG_INIT, "Probe called\n");
+
+ self = kzalloc(sizeof(*self), GFP_KERNEL);
+ if (!self) {
+ cw1200_dbg(CW1200_DBG_ERROR, "Can't allocate SDIO sbus_priv.");
+ return -ENOMEM;
+ }
+
+ spin_lock_init(&self->lock);
+ 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_core_probe(&cw1200_sdio_sbus_ops,
+ self, &func->dev, &self->core);
+ if (status) {
+ 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) {
+ 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_suspend(struct device *dev)
+{
+ int ret;
+ struct sdio_func *func = dev_to_sdio_func(dev);
+
+ /* Notify SDIO that CW1200 will remain powered during suspend */
+ ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
+ if (ret)
+ cw1200_dbg(CW1200_DBG_ERROR,
+ "Error setting SDIO pm flags: %i\n", ret);
+
+ return ret;
+}
+
+static int cw1200_resume(struct device *dev)
+{
+ return 0;
+}
+
+static const struct dev_pm_ops cw1200_pm_ops = {
+ .suspend = cw1200_suspend,
+ .resume = cw1200_resume,
+};
+
+static struct sdio_driver sdio_driver = {
+ .name = "cw1200_wlan",
+ .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 *pdata;
+ int ret;
+
+ pdata = cw1200_get_platform_data();
+
+ ret = sdio_register_driver(&sdio_driver);
+ if (ret)
+ goto err_reg;
+
+ if (pdata->clk_ctrl) {
+ ret = pdata->clk_ctrl(pdata, true);
+ if (ret)
+ goto err_clk;
+ }
+
+ if (pdata->power_ctrl) {
+ ret = pdata->power_ctrl(pdata, true);
+ if (ret)
+ goto err_power;
+ }
+
+ ret = cw1200_sdio_on(pdata);
+ if (ret)
+ goto err_on;
+
+ return 0;
+
+err_on:
+ if (pdata->power_ctrl)
+ pdata->power_ctrl(pdata, false);
+err_power:
+ if (pdata->clk_ctrl)
+ pdata->clk_ctrl(pdata, false);
+err_clk:
+ sdio_unregister_driver(&sdio_driver);
+err_reg:
+ return ret;
+}
+
+/* Called at Driver Unloading */
+static void __exit cw1200_sdio_exit(void)
+{
+ const struct cw1200_platform_data *pdata;
+ pdata = cw1200_get_platform_data();
+ sdio_unregister_driver(&sdio_driver);
+ cw1200_sdio_off(pdata);
+ if (pdata->power_ctrl)
+ pdata->power_ctrl(pdata, false);
+ if (pdata->clk_ctrl)
+ pdata->clk_ctrl(pdata, false);
+}
+
+#if defined(CONFIG_CW1200_STANDALONE)
+const struct cw1200_platform_data *cw1200_get_platform_data()
+{
+ static const struct cw1200_platform_data pdata = {
+ .mmc_id = cw1200_mmc_id,
+ };
+ return &pdata;
+}
+#endif /* CONFIG_CW1200_STANDALONE */
+
+module_init(cw1200_sdio_init);
+module_exit(cw1200_sdio_exit);
--
1.7.9
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