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_device.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 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 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 93 static void wfx_sdio_lock(void *priv) 94 { 95 struct wfx_sdio_priv *bus = priv; 96 97 sdio_claim_host(bus->func); 98 } 99 100 static void wfx_sdio_unlock(void *priv) 101 { 102 struct wfx_sdio_priv *bus = priv; 103 104 sdio_release_host(bus->func); 105 } 106 107 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 } 113 114 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 } 123 124 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 } 154 155 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 } 167 168 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); 193 194 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 } 246 247 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 .owner = THIS_MODULE, 271 .of_match_table = wfx_sdio_of_match, 272 } 273 }; 274