1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Mac80211 SDIO driver for ST-Ericsson CW1200 device
4 *
5 * Copyright (c) 2010, ST-Ericsson
6 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
7 */
8
9#include <linux/module.h>
10#include <linux/interrupt.h>
11#include <linux/gpio.h>
12#include <linux/delay.h>
13#include <linux/mmc/host.h>
14#include <linux/mmc/sdio_func.h>
15#include <linux/mmc/card.h>
16#include <linux/mmc/sdio.h>
17#include <linux/mmc/sdio_ids.h>
18#include <net/mac80211.h>
19
20#include "cw1200.h"
21#include "hwbus.h"
22#include <linux/platform_data/net-cw1200.h>
23#include "hwio.h"
24
25MODULE_AUTHOR("Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>");
26MODULE_DESCRIPTION("mac80211 ST-Ericsson CW1200 SDIO driver");
27MODULE_LICENSE("GPL");
28
29#define SDIO_BLOCK_SIZE (512)
30
31/* Default platform data for Sagrad modules */
32static struct cw1200_platform_data_sdio sagrad_109x_evk_platform_data = {
33	.ref_clk = 38400,
34	.have_5ghz = false,
35	.sdd_file = "sdd_sagrad_1091_1098.bin",
36};
37
38/* Allow platform data to be overridden */
39static struct cw1200_platform_data_sdio *global_plat_data = &sagrad_109x_evk_platform_data;
40
41void __init cw1200_sdio_set_platform_data(struct cw1200_platform_data_sdio *pdata)
42{
43	global_plat_data = pdata;
44}
45
46struct hwbus_priv {
47	struct sdio_func	*func;
48	struct cw1200_common	*core;
49	const struct cw1200_platform_data_sdio *pdata;
50};
51
52static const struct sdio_device_id cw1200_sdio_ids[] = {
53	{ SDIO_DEVICE(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200) },
54	{ /* end: all zeroes */			},
55};
56MODULE_DEVICE_TABLE(sdio, cw1200_sdio_ids);
57
58/* hwbus_ops implemetation */
59
60static int cw1200_sdio_memcpy_fromio(struct hwbus_priv *self,
61				     unsigned int addr,
62				     void *dst, int count)
63{
64	return sdio_memcpy_fromio(self->func, dst, addr, count);
65}
66
67static int cw1200_sdio_memcpy_toio(struct hwbus_priv *self,
68				   unsigned int addr,
69				   const void *src, int count)
70{
71	return sdio_memcpy_toio(self->func, addr, (void *)src, count);
72}
73
74static void cw1200_sdio_lock(struct hwbus_priv *self)
75{
76	sdio_claim_host(self->func);
77}
78
79static void cw1200_sdio_unlock(struct hwbus_priv *self)
80{
81	sdio_release_host(self->func);
82}
83
84static void cw1200_sdio_irq_handler(struct sdio_func *func)
85{
86	struct hwbus_priv *self = sdio_get_drvdata(func);
87
88	/* note:  sdio_host already claimed here. */
89	if (self->core)
90		cw1200_irq_handler(self->core);
91}
92
93static irqreturn_t cw1200_gpio_hardirq(int irq, void *dev_id)
94{
95	return IRQ_WAKE_THREAD;
96}
97
98static irqreturn_t cw1200_gpio_irq(int irq, void *dev_id)
99{
100	struct hwbus_priv *self = dev_id;
101
102	if (self->core) {
103		cw1200_sdio_lock(self);
104		cw1200_irq_handler(self->core);
105		cw1200_sdio_unlock(self);
106		return IRQ_HANDLED;
107	} else {
108		return IRQ_NONE;
109	}
110}
111
112static int cw1200_request_irq(struct hwbus_priv *self)
113{
114	int ret;
115	u8 cccr;
116
117	cccr = sdio_f0_readb(self->func, SDIO_CCCR_IENx, &ret);
118	if (WARN_ON(ret))
119		goto err;
120
121	/* Master interrupt enable ... */
122	cccr |= BIT(0);
123
124	/* ... for our function */
125	cccr |= BIT(self->func->num);
126
127	sdio_f0_writeb(self->func, cccr, SDIO_CCCR_IENx, &ret);
128	if (WARN_ON(ret))
129		goto err;
130
131	ret = enable_irq_wake(self->pdata->irq);
132	if (WARN_ON(ret))
133		goto err;
134
135	/* Request the IRQ */
136	ret =  request_threaded_irq(self->pdata->irq, cw1200_gpio_hardirq,
137				    cw1200_gpio_irq,
138				    IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
139				    "cw1200_wlan_irq", self);
140	if (WARN_ON(ret))
141		goto err;
142
143	return 0;
144
145err:
146	return ret;
147}
148
149static int cw1200_sdio_irq_subscribe(struct hwbus_priv *self)
150{
151	int ret = 0;
152
153	pr_debug("SW IRQ subscribe\n");
154	sdio_claim_host(self->func);
155	if (self->pdata->irq)
156		ret = cw1200_request_irq(self);
157	else
158		ret = sdio_claim_irq(self->func, cw1200_sdio_irq_handler);
159
160	sdio_release_host(self->func);
161	return ret;
162}
163
164static int cw1200_sdio_irq_unsubscribe(struct hwbus_priv *self)
165{
166	int ret = 0;
167
168	pr_debug("SW IRQ unsubscribe\n");
169
170	if (self->pdata->irq) {
171		disable_irq_wake(self->pdata->irq);
172		free_irq(self->pdata->irq, self);
173	} else {
174		sdio_claim_host(self->func);
175		ret = sdio_release_irq(self->func);
176		sdio_release_host(self->func);
177	}
178	return ret;
179}
180
181static int cw1200_sdio_off(const struct cw1200_platform_data_sdio *pdata)
182{
183	if (pdata->reset) {
184		gpio_set_value(pdata->reset, 0);
185		msleep(30); /* Min is 2 * CLK32K cycles */
186		gpio_free(pdata->reset);
187	}
188
189	if (pdata->power_ctrl)
190		pdata->power_ctrl(pdata, false);
191	if (pdata->clk_ctrl)
192		pdata->clk_ctrl(pdata, false);
193
194	return 0;
195}
196
197static int cw1200_sdio_on(const struct cw1200_platform_data_sdio *pdata)
198{
199	/* Ensure I/Os are pulled low */
200	if (pdata->reset) {
201		gpio_request(pdata->reset, "cw1200_wlan_reset");
202		gpio_direction_output(pdata->reset, 0);
203	}
204	if (pdata->powerup) {
205		gpio_request(pdata->powerup, "cw1200_wlan_powerup");
206		gpio_direction_output(pdata->powerup, 0);
207	}
208	if (pdata->reset || pdata->powerup)
209		msleep(10); /* Settle time? */
210
211	/* Enable 3v3 and 1v8 to hardware */
212	if (pdata->power_ctrl) {
213		if (pdata->power_ctrl(pdata, true)) {
214			pr_err("power_ctrl() failed!\n");
215			return -1;
216		}
217	}
218
219	/* Enable CLK32K */
220	if (pdata->clk_ctrl) {
221		if (pdata->clk_ctrl(pdata, true)) {
222			pr_err("clk_ctrl() failed!\n");
223			return -1;
224		}
225		msleep(10); /* Delay until clock is stable for 2 cycles */
226	}
227
228	/* Enable POWERUP signal */
229	if (pdata->powerup) {
230		gpio_set_value(pdata->powerup, 1);
231		msleep(250); /* or more..? */
232	}
233	/* Enable RSTn signal */
234	if (pdata->reset) {
235		gpio_set_value(pdata->reset, 1);
236		msleep(50); /* Or more..? */
237	}
238	return 0;
239}
240
241static size_t cw1200_sdio_align_size(struct hwbus_priv *self, size_t size)
242{
243	if (self->pdata->no_nptb)
244		size = round_up(size, SDIO_BLOCK_SIZE);
245	else
246		size = sdio_align_size(self->func, size);
247
248	return size;
249}
250
251static int cw1200_sdio_pm(struct hwbus_priv *self, bool suspend)
252{
253	int ret = 0;
254
255	if (self->pdata->irq)
256		ret = irq_set_irq_wake(self->pdata->irq, suspend);
257	return ret;
258}
259
260static const struct hwbus_ops cw1200_sdio_hwbus_ops = {
261	.hwbus_memcpy_fromio	= cw1200_sdio_memcpy_fromio,
262	.hwbus_memcpy_toio	= cw1200_sdio_memcpy_toio,
263	.lock			= cw1200_sdio_lock,
264	.unlock			= cw1200_sdio_unlock,
265	.align_size		= cw1200_sdio_align_size,
266	.power_mgmt		= cw1200_sdio_pm,
267};
268
269/* Probe Function to be called by SDIO stack when device is discovered */
270static int cw1200_sdio_probe(struct sdio_func *func,
271			     const struct sdio_device_id *id)
272{
273	struct hwbus_priv *self;
274	int status;
275
276	pr_info("cw1200_wlan_sdio: Probe called\n");
277
278	/* We are only able to handle the wlan function */
279	if (func->num != 0x01)
280		return -ENODEV;
281
282	self = kzalloc(sizeof(*self), GFP_KERNEL);
283	if (!self) {
284		pr_err("Can't allocate SDIO hwbus_priv.\n");
285		return -ENOMEM;
286	}
287
288	func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
289
290	self->pdata = global_plat_data; /* FIXME */
291	self->func = func;
292	sdio_set_drvdata(func, self);
293	sdio_claim_host(func);
294	sdio_enable_func(func);
295	sdio_release_host(func);
296
297	status = cw1200_sdio_irq_subscribe(self);
298
299	status = cw1200_core_probe(&cw1200_sdio_hwbus_ops,
300				   self, &func->dev, &self->core,
301				   self->pdata->ref_clk,
302				   self->pdata->macaddr,
303				   self->pdata->sdd_file,
304				   self->pdata->have_5ghz);
305	if (status) {
306		cw1200_sdio_irq_unsubscribe(self);
307		sdio_claim_host(func);
308		sdio_disable_func(func);
309		sdio_release_host(func);
310		sdio_set_drvdata(func, NULL);
311		kfree(self);
312	}
313
314	return status;
315}
316
317/* Disconnect Function to be called by SDIO stack when
318 * device is disconnected
319 */
320static void cw1200_sdio_disconnect(struct sdio_func *func)
321{
322	struct hwbus_priv *self = sdio_get_drvdata(func);
323
324	if (self) {
325		cw1200_sdio_irq_unsubscribe(self);
326		if (self->core) {
327			cw1200_core_release(self->core);
328			self->core = NULL;
329		}
330		sdio_claim_host(func);
331		sdio_disable_func(func);
332		sdio_release_host(func);
333		sdio_set_drvdata(func, NULL);
334		kfree(self);
335	}
336}
337
338#ifdef CONFIG_PM
339static int cw1200_sdio_suspend(struct device *dev)
340{
341	int ret;
342	struct sdio_func *func = dev_to_sdio_func(dev);
343	struct hwbus_priv *self = sdio_get_drvdata(func);
344
345	if (!cw1200_can_suspend(self->core))
346		return -EAGAIN;
347
348	/* Notify SDIO that CW1200 will remain powered during suspend */
349	ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
350	if (ret)
351		pr_err("Error setting SDIO pm flags: %i\n", ret);
352
353	return ret;
354}
355
356static int cw1200_sdio_resume(struct device *dev)
357{
358	return 0;
359}
360
361static const struct dev_pm_ops cw1200_pm_ops = {
362	.suspend = cw1200_sdio_suspend,
363	.resume = cw1200_sdio_resume,
364};
365#endif
366
367static struct sdio_driver sdio_driver = {
368	.name		= "cw1200_wlan_sdio",
369	.id_table	= cw1200_sdio_ids,
370	.probe		= cw1200_sdio_probe,
371	.remove		= cw1200_sdio_disconnect,
372#ifdef CONFIG_PM
373	.drv = {
374		.pm = &cw1200_pm_ops,
375	}
376#endif
377};
378
379/* Init Module function -> Called by insmod */
380static int __init cw1200_sdio_init(void)
381{
382	const struct cw1200_platform_data_sdio *pdata;
383	int ret;
384
385	/* FIXME -- this won't support multiple devices */
386	pdata = global_plat_data;
387
388	if (cw1200_sdio_on(pdata)) {
389		ret = -1;
390		goto err;
391	}
392
393	ret = sdio_register_driver(&sdio_driver);
394	if (ret)
395		goto err;
396
397	return 0;
398
399err:
400	cw1200_sdio_off(pdata);
401	return ret;
402}
403
404/* Called at Driver Unloading */
405static void __exit cw1200_sdio_exit(void)
406{
407	const struct cw1200_platform_data_sdio *pdata;
408
409	/* FIXME -- this won't support multiple devices */
410	pdata = global_plat_data;
411	sdio_unregister_driver(&sdio_driver);
412	cw1200_sdio_off(pdata);
413}
414
415
416module_init(cw1200_sdio_init);
417module_exit(cw1200_sdio_exit);
418