1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * SDIO interface.
4 *
5 * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
6 * Copyright (c) 2010, ST-Ericsson
7 */
8 #include <linux/module.h>
9 #include <linux/mmc/sdio.h>
10 #include <linux/mmc/sdio_func.h>
11 #include <linux/mmc/card.h>
12 #include <linux/interrupt.h>
13 #include <linux/of.h>
14 #include <linux/of_irq.h>
15 #include <linux/irq.h>
16 #include <linux/align.h>
17
18 #include "bus.h"
19 #include "wfx.h"
20 #include "hwio.h"
21 #include "main.h"
22 #include "bh.h"
23
24 static const struct wfx_platform_data pdata_wf200 = {
25 .file_fw = "wfx/wfm_wf200",
26 .file_pds = "wfx/wf200.pds",
27 };
28
29 static const struct wfx_platform_data pdata_brd4001a = {
30 .file_fw = "wfx/wfm_wf200",
31 .file_pds = "wfx/brd4001a.pds",
32 };
33
34 static const struct wfx_platform_data pdata_brd8022a = {
35 .file_fw = "wfx/wfm_wf200",
36 .file_pds = "wfx/brd8022a.pds",
37 };
38
39 static const struct wfx_platform_data pdata_brd8023a = {
40 .file_fw = "wfx/wfm_wf200",
41 .file_pds = "wfx/brd8023a.pds",
42 };
43
44 struct wfx_sdio_priv {
45 struct sdio_func *func;
46 struct wfx_dev *core;
47 u8 buf_id_tx;
48 u8 buf_id_rx;
49 int of_irq;
50 };
51
wfx_sdio_copy_from_io(void * priv,unsigned int reg_id,void * dst,size_t count)52 static int wfx_sdio_copy_from_io(void *priv, unsigned int reg_id, void *dst, size_t count)
53 {
54 struct wfx_sdio_priv *bus = priv;
55 unsigned int sdio_addr = reg_id << 2;
56 int ret;
57
58 WARN(reg_id > 7, "chip only has 7 registers");
59 WARN(!IS_ALIGNED((uintptr_t)dst, 4), "unaligned buffer address");
60 WARN(!IS_ALIGNED(count, 4), "unaligned buffer size");
61
62 /* Use queue mode buffers */
63 if (reg_id == WFX_REG_IN_OUT_QUEUE)
64 sdio_addr |= (bus->buf_id_rx + 1) << 7;
65 ret = sdio_memcpy_fromio(bus->func, dst, sdio_addr, count);
66 if (!ret && reg_id == WFX_REG_IN_OUT_QUEUE)
67 bus->buf_id_rx = (bus->buf_id_rx + 1) % 4;
68
69 return ret;
70 }
71
wfx_sdio_copy_to_io(void * priv,unsigned int reg_id,const void * src,size_t count)72 static int wfx_sdio_copy_to_io(void *priv, unsigned int reg_id, const void *src, size_t count)
73 {
74 struct wfx_sdio_priv *bus = priv;
75 unsigned int sdio_addr = reg_id << 2;
76 int ret;
77
78 WARN(reg_id > 7, "chip only has 7 registers");
79 WARN(!IS_ALIGNED((uintptr_t)src, 4), "unaligned buffer address");
80 WARN(!IS_ALIGNED(count, 4), "unaligned buffer size");
81
82 /* Use queue mode buffers */
83 if (reg_id == WFX_REG_IN_OUT_QUEUE)
84 sdio_addr |= bus->buf_id_tx << 7;
85 /* FIXME: discards 'const' qualifier for src */
86 ret = sdio_memcpy_toio(bus->func, sdio_addr, (void *)src, count);
87 if (!ret && reg_id == WFX_REG_IN_OUT_QUEUE)
88 bus->buf_id_tx = (bus->buf_id_tx + 1) % 32;
89
90 return ret;
91 }
92
wfx_sdio_lock(void * priv)93 static void wfx_sdio_lock(void *priv)
94 {
95 struct wfx_sdio_priv *bus = priv;
96
97 sdio_claim_host(bus->func);
98 }
99
wfx_sdio_unlock(void * priv)100 static void wfx_sdio_unlock(void *priv)
101 {
102 struct wfx_sdio_priv *bus = priv;
103
104 sdio_release_host(bus->func);
105 }
106
wfx_sdio_irq_handler(struct sdio_func * func)107 static void wfx_sdio_irq_handler(struct sdio_func *func)
108 {
109 struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
110
111 wfx_bh_request_rx(bus->core);
112 }
113
wfx_sdio_irq_handler_ext(int irq,void * priv)114 static irqreturn_t wfx_sdio_irq_handler_ext(int irq, void *priv)
115 {
116 struct wfx_sdio_priv *bus = priv;
117
118 sdio_claim_host(bus->func);
119 wfx_bh_request_rx(bus->core);
120 sdio_release_host(bus->func);
121 return IRQ_HANDLED;
122 }
123
wfx_sdio_irq_subscribe(void * priv)124 static int wfx_sdio_irq_subscribe(void *priv)
125 {
126 struct wfx_sdio_priv *bus = priv;
127 u32 flags;
128 int ret;
129 u8 cccr;
130
131 if (!bus->of_irq) {
132 sdio_claim_host(bus->func);
133 ret = sdio_claim_irq(bus->func, wfx_sdio_irq_handler);
134 sdio_release_host(bus->func);
135 return ret;
136 }
137
138 flags = irq_get_trigger_type(bus->of_irq);
139 if (!flags)
140 flags = IRQF_TRIGGER_HIGH;
141 flags |= IRQF_ONESHOT;
142 ret = devm_request_threaded_irq(&bus->func->dev, bus->of_irq, NULL,
143 wfx_sdio_irq_handler_ext, flags, "wfx", bus);
144 if (ret)
145 return ret;
146 sdio_claim_host(bus->func);
147 cccr = sdio_f0_readb(bus->func, SDIO_CCCR_IENx, NULL);
148 cccr |= BIT(0);
149 cccr |= BIT(bus->func->num);
150 sdio_f0_writeb(bus->func, cccr, SDIO_CCCR_IENx, NULL);
151 sdio_release_host(bus->func);
152 return 0;
153 }
154
wfx_sdio_irq_unsubscribe(void * priv)155 static int wfx_sdio_irq_unsubscribe(void *priv)
156 {
157 struct wfx_sdio_priv *bus = priv;
158 int ret;
159
160 if (bus->of_irq)
161 devm_free_irq(&bus->func->dev, bus->of_irq, bus);
162 sdio_claim_host(bus->func);
163 ret = sdio_release_irq(bus->func);
164 sdio_release_host(bus->func);
165 return ret;
166 }
167
wfx_sdio_align_size(void * priv,size_t size)168 static size_t wfx_sdio_align_size(void *priv, size_t size)
169 {
170 struct wfx_sdio_priv *bus = priv;
171
172 return sdio_align_size(bus->func, size);
173 }
174
175 static const struct wfx_hwbus_ops wfx_sdio_hwbus_ops = {
176 .copy_from_io = wfx_sdio_copy_from_io,
177 .copy_to_io = wfx_sdio_copy_to_io,
178 .irq_subscribe = wfx_sdio_irq_subscribe,
179 .irq_unsubscribe = wfx_sdio_irq_unsubscribe,
180 .lock = wfx_sdio_lock,
181 .unlock = wfx_sdio_unlock,
182 .align_size = wfx_sdio_align_size,
183 };
184
185 static const struct of_device_id wfx_sdio_of_match[] = {
186 { .compatible = "silabs,wf200", .data = &pdata_wf200 },
187 { .compatible = "silabs,brd4001a", .data = &pdata_brd4001a },
188 { .compatible = "silabs,brd8022a", .data = &pdata_brd8022a },
189 { .compatible = "silabs,brd8023a", .data = &pdata_brd8023a },
190 { },
191 };
192 MODULE_DEVICE_TABLE(of, wfx_sdio_of_match);
193
wfx_sdio_probe(struct sdio_func * func,const struct sdio_device_id * id)194 static int wfx_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id)
195 {
196 const struct wfx_platform_data *pdata = of_device_get_match_data(&func->dev);
197 struct device_node *np = func->dev.of_node;
198 struct wfx_sdio_priv *bus;
199 int ret;
200
201 if (func->num != 1) {
202 dev_err(&func->dev, "SDIO function number is %d while it should always be 1 (unsupported chip?)\n",
203 func->num);
204 return -ENODEV;
205 }
206
207 if (!pdata) {
208 dev_warn(&func->dev, "no compatible device found in DT\n");
209 return -ENODEV;
210 }
211
212 bus = devm_kzalloc(&func->dev, sizeof(*bus), GFP_KERNEL);
213 if (!bus)
214 return -ENOMEM;
215
216 bus->func = func;
217 bus->of_irq = irq_of_parse_and_map(np, 0);
218 sdio_set_drvdata(func, bus);
219
220 sdio_claim_host(func);
221 ret = sdio_enable_func(func);
222 /* Block of 64 bytes is more efficient than 512B for frame sizes < 4k */
223 sdio_set_block_size(func, 64);
224 sdio_release_host(func);
225 if (ret)
226 return ret;
227
228 bus->core = wfx_init_common(&func->dev, pdata, &wfx_sdio_hwbus_ops, bus);
229 if (!bus->core) {
230 ret = -EIO;
231 goto sdio_release;
232 }
233
234 ret = wfx_probe(bus->core);
235 if (ret)
236 goto sdio_release;
237
238 return 0;
239
240 sdio_release:
241 sdio_claim_host(func);
242 sdio_disable_func(func);
243 sdio_release_host(func);
244 return ret;
245 }
246
wfx_sdio_remove(struct sdio_func * func)247 static void wfx_sdio_remove(struct sdio_func *func)
248 {
249 struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
250
251 wfx_release(bus->core);
252 sdio_claim_host(func);
253 sdio_disable_func(func);
254 sdio_release_host(func);
255 }
256
257 static const struct sdio_device_id wfx_sdio_ids[] = {
258 /* WF200 does not have official VID/PID */
259 { SDIO_DEVICE(0x0000, 0x1000) },
260 { },
261 };
262 MODULE_DEVICE_TABLE(sdio, wfx_sdio_ids);
263
264 struct sdio_driver wfx_sdio_driver = {
265 .name = "wfx-sdio",
266 .id_table = wfx_sdio_ids,
267 .probe = wfx_sdio_probe,
268 .remove = wfx_sdio_remove,
269 .drv = {
270 .of_match_table = wfx_sdio_of_match,
271 }
272 };
273