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417 lines
9.1 KiB
417 lines
9.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Mac80211 SDIO driver for ST-Ericsson CW1200 device |
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* |
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* Copyright (c) 2010, ST-Ericsson |
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* Author: Dmitry Tarnyagin <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/gpio.h> |
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#include <linux/delay.h> |
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#include <linux/mmc/host.h> |
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#include <linux/mmc/sdio_func.h> |
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#include <linux/mmc/card.h> |
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#include <linux/mmc/sdio.h> |
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#include <linux/mmc/sdio_ids.h> |
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#include <net/mac80211.h> |
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#include "cw1200.h" |
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#include "hwbus.h" |
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#include <linux/platform_data/net-cw1200.h> |
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#include "hwio.h" |
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MODULE_AUTHOR("Dmitry Tarnyagin <[email protected]>"); |
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MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver"); |
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MODULE_LICENSE("GPL"); |
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#define SDIO_BLOCK_SIZE (512) |
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/* Default platform data for Sagrad modules */ |
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static struct cw1200_platform_data_sdio sagrad_109x_evk_platform_data = { |
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.ref_clk = 38400, |
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.have_5ghz = false, |
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.sdd_file = "sdd_sagrad_1091_1098.bin", |
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}; |
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/* Allow platform data to be overridden */ |
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static struct cw1200_platform_data_sdio *global_plat_data = &sagrad_109x_evk_platform_data; |
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void __init cw1200_sdio_set_platform_data(struct cw1200_platform_data_sdio *pdata) |
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{ |
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global_plat_data = pdata; |
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} |
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struct hwbus_priv { |
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struct sdio_func *func; |
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struct cw1200_common *core; |
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const struct cw1200_platform_data_sdio *pdata; |
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}; |
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static const struct sdio_device_id cw1200_sdio_ids[] = { |
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{ SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) }, |
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{ /* end: all zeroes */ }, |
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}; |
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MODULE_DEVICE_TABLE(sdio, cw1200_sdio_ids); |
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/* hwbus_ops implemetation */ |
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static int cw1200_sdio_memcpy_fromio(struct hwbus_priv *self, |
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unsigned int addr, |
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void *dst, int count) |
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{ |
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return sdio_memcpy_fromio(self->func, dst, addr, count); |
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} |
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static int cw1200_sdio_memcpy_toio(struct hwbus_priv *self, |
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unsigned int addr, |
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const void *src, int count) |
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{ |
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return sdio_memcpy_toio(self->func, addr, (void *)src, count); |
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} |
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static void cw1200_sdio_lock(struct hwbus_priv *self) |
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{ |
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sdio_claim_host(self->func); |
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} |
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static void cw1200_sdio_unlock(struct hwbus_priv *self) |
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{ |
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sdio_release_host(self->func); |
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} |
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static void cw1200_sdio_irq_handler(struct sdio_func *func) |
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{ |
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struct hwbus_priv *self = sdio_get_drvdata(func); |
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/* note: sdio_host already claimed here. */ |
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if (self->core) |
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cw1200_irq_handler(self->core); |
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} |
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static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id) |
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{ |
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return IRQ_WAKE_THREAD; |
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} |
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static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id) |
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{ |
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struct hwbus_priv *self = dev_id; |
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if (self->core) { |
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cw1200_sdio_lock(self); |
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cw1200_irq_handler(self->core); |
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cw1200_sdio_unlock(self); |
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return IRQ_HANDLED; |
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} else { |
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return IRQ_NONE; |
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} |
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} |
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static int cw1200_request_irq(struct hwbus_priv *self) |
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{ |
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int ret; |
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u8 cccr; |
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cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret); |
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if (WARN_ON(ret)) |
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goto err; |
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/* Master interrupt enable ... */ |
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cccr |= BIT(0); |
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/* ... for our function */ |
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cccr |= BIT(self->func->num); |
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sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret); |
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if (WARN_ON(ret)) |
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goto err; |
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ret = enable_irq_wake(self->pdata->irq); |
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if (WARN_ON(ret)) |
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goto err; |
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/* Request the IRQ */ |
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ret = request_threaded_irq(self->pdata->irq, cw1200_gpio_hardirq, |
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cw1200_gpio_irq, |
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IRQF_TRIGGER_HIGH | IRQF_ONESHOT, |
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"cw1200_wlan_irq", self); |
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if (WARN_ON(ret)) |
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goto err; |
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return 0; |
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err: |
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return ret; |
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} |
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static int cw1200_sdio_irq_subscribe(struct hwbus_priv *self) |
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{ |
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int ret = 0; |
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pr_debug("SW IRQ subscribe\n"); |
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sdio_claim_host(self->func); |
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if (self->pdata->irq) |
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ret = cw1200_request_irq(self); |
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else |
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ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler); |
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sdio_release_host(self->func); |
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return ret; |
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} |
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static int cw1200_sdio_irq_unsubscribe(struct hwbus_priv *self) |
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{ |
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int ret = 0; |
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pr_debug("SW IRQ unsubscribe\n"); |
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if (self->pdata->irq) { |
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disable_irq_wake(self->pdata->irq); |
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free_irq(self->pdata->irq, self); |
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} else { |
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sdio_claim_host(self->func); |
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ret = sdio_release_irq(self->func); |
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sdio_release_host(self->func); |
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} |
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return ret; |
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} |
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static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata) |
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{ |
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if (pdata->reset) { |
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gpio_set_value(pdata->reset, 0); |
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msleep(30); /* Min is 2 * CLK32K cycles */ |
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gpio_free(pdata->reset); |
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} |
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if (pdata->power_ctrl) |
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pdata->power_ctrl(pdata, false); |
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if (pdata->clk_ctrl) |
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pdata->clk_ctrl(pdata, false); |
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return 0; |
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} |
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static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata) |
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{ |
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/* Ensure I/Os are pulled low */ |
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if (pdata->reset) { |
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gpio_request(pdata->reset, "cw1200_wlan_reset"); |
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gpio_direction_output(pdata->reset, 0); |
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} |
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if (pdata->powerup) { |
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gpio_request(pdata->powerup, "cw1200_wlan_powerup"); |
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gpio_direction_output(pdata->powerup, 0); |
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} |
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if (pdata->reset || pdata->powerup) |
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msleep(10); /* Settle time? */ |
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/* Enable 3v3 and 1v8 to hardware */ |
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if (pdata->power_ctrl) { |
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if (pdata->power_ctrl(pdata, true)) { |
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pr_err("power_ctrl() failed!\n"); |
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return -1; |
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} |
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} |
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/* Enable CLK32K */ |
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if (pdata->clk_ctrl) { |
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if (pdata->clk_ctrl(pdata, true)) { |
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pr_err("clk_ctrl() failed!\n"); |
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return -1; |
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} |
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msleep(10); /* Delay until clock is stable for 2 cycles */ |
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} |
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/* Enable POWERUP signal */ |
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if (pdata->powerup) { |
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gpio_set_value(pdata->powerup, 1); |
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msleep(250); /* or more..? */ |
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} |
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/* Enable RSTn signal */ |
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if (pdata->reset) { |
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gpio_set_value(pdata->reset, 1); |
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msleep(50); /* Or more..? */ |
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} |
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return 0; |
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} |
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static size_t cw1200_sdio_align_size(struct hwbus_priv *self, size_t size) |
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{ |
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if (self->pdata->no_nptb) |
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size = round_up(size, SDIO_BLOCK_SIZE); |
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else |
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size = sdio_align_size(self->func, size); |
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return size; |
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} |
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static int cw1200_sdio_pm(struct hwbus_priv *self, bool suspend) |
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{ |
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int ret = 0; |
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if (self->pdata->irq) |
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ret = irq_set_irq_wake(self->pdata->irq, suspend); |
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return ret; |
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} |
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static const struct hwbus_ops cw1200_sdio_hwbus_ops = { |
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.hwbus_memcpy_fromio = cw1200_sdio_memcpy_fromio, |
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.hwbus_memcpy_toio = cw1200_sdio_memcpy_toio, |
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.lock = cw1200_sdio_lock, |
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.unlock = cw1200_sdio_unlock, |
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.align_size = cw1200_sdio_align_size, |
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.power_mgmt = cw1200_sdio_pm, |
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}; |
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/* Probe Function to be called by SDIO stack when device is discovered */ |
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static int cw1200_sdio_probe(struct sdio_func *func, |
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const struct sdio_device_id *id) |
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{ |
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struct hwbus_priv *self; |
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int status; |
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pr_info("cw1200_wlan_sdio: Probe called\n"); |
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/* We are only able to handle the wlan function */ |
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if (func->num != 0x01) |
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return -ENODEV; |
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self = kzalloc(sizeof(*self), GFP_KERNEL); |
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if (!self) { |
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pr_err("Can't allocate SDIO hwbus_priv.\n"); |
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return -ENOMEM; |
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} |
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func->card->quirks |= MMC_QUIRK_LENIENT_FN0; |
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self->pdata = global_plat_data; /* FIXME */ |
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self->func = func; |
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sdio_set_drvdata(func, self); |
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sdio_claim_host(func); |
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sdio_enable_func(func); |
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sdio_release_host(func); |
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status = cw1200_sdio_irq_subscribe(self); |
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status = cw1200_core_probe(&cw1200_sdio_hwbus_ops, |
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self, &func->dev, &self->core, |
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self->pdata->ref_clk, |
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self->pdata->macaddr, |
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self->pdata->sdd_file, |
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self->pdata->have_5ghz); |
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if (status) { |
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cw1200_sdio_irq_unsubscribe(self); |
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sdio_claim_host(func); |
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sdio_disable_func(func); |
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sdio_release_host(func); |
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sdio_set_drvdata(func, NULL); |
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kfree(self); |
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} |
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return status; |
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} |
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/* Disconnect Function to be called by SDIO stack when |
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* device is disconnected |
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*/ |
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static void cw1200_sdio_disconnect(struct sdio_func *func) |
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{ |
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struct hwbus_priv *self = sdio_get_drvdata(func); |
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if (self) { |
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cw1200_sdio_irq_unsubscribe(self); |
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if (self->core) { |
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cw1200_core_release(self->core); |
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self->core = NULL; |
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} |
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sdio_claim_host(func); |
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sdio_disable_func(func); |
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sdio_release_host(func); |
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sdio_set_drvdata(func, NULL); |
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kfree(self); |
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} |
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} |
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#ifdef CONFIG_PM |
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static int cw1200_sdio_suspend(struct device *dev) |
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{ |
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int ret; |
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struct sdio_func *func = dev_to_sdio_func(dev); |
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struct hwbus_priv *self = sdio_get_drvdata(func); |
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if (!cw1200_can_suspend(self->core)) |
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return -EAGAIN; |
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/* Notify SDIO that CW1200 will remain powered during suspend */ |
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ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER); |
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if (ret) |
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pr_err("Error setting SDIO pm flags: %i\n", ret); |
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return ret; |
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} |
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static int cw1200_sdio_resume(struct device *dev) |
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{ |
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return 0; |
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} |
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static const struct dev_pm_ops cw1200_pm_ops = { |
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.suspend = cw1200_sdio_suspend, |
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.resume = cw1200_sdio_resume, |
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}; |
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#endif |
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static struct sdio_driver sdio_driver = { |
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.name = "cw1200_wlan_sdio", |
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.id_table = cw1200_sdio_ids, |
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.probe = cw1200_sdio_probe, |
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.remove = cw1200_sdio_disconnect, |
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#ifdef CONFIG_PM |
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.drv = { |
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.pm = &cw1200_pm_ops, |
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} |
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#endif |
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}; |
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/* Init Module function -> Called by insmod */ |
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static int __init cw1200_sdio_init(void) |
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{ |
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const struct cw1200_platform_data_sdio *pdata; |
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int ret; |
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/* FIXME -- this won't support multiple devices */ |
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pdata = global_plat_data; |
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if (cw1200_sdio_on(pdata)) { |
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ret = -1; |
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goto err; |
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} |
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ret = sdio_register_driver(&sdio_driver); |
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if (ret) |
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goto err; |
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return 0; |
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err: |
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cw1200_sdio_off(pdata); |
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return ret; |
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} |
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/* Called at Driver Unloading */ |
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static void __exit cw1200_sdio_exit(void) |
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{ |
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const struct cw1200_platform_data_sdio *pdata; |
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/* FIXME -- this won't support multiple devices */ |
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pdata = global_plat_data; |
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sdio_unregister_driver(&sdio_driver); |
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cw1200_sdio_off(pdata); |
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} |
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module_init(cw1200_sdio_init); |
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module_exit(cw1200_sdio_exit);
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