1 /* 2 * Renesas USB driver 3 * 4 * Copyright (C) 2011 Renesas Solutions Corp. 5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 15 * 16 */ 17 #include <linux/interrupt.h> 18 19 #include "./common.h" 20 #include "./mod.h" 21 22 #define usbhs_priv_to_modinfo(priv) (&priv->mod_info) 23 #define usbhs_mod_info_call(priv, func, param...) \ 24 ({ \ 25 struct usbhs_mod_info *info; \ 26 info = usbhs_priv_to_modinfo(priv); \ 27 !info->func ? 0 : \ 28 info->func(param); \ 29 }) 30 31 /* 32 * autonomy 33 * 34 * these functions are used if platform doesn't have external phy. 35 * -> there is no "notify_hotplug" callback from platform 36 * -> call "notify_hotplug" by itself 37 * -> use own interrupt to connect/disconnect 38 * -> it mean module clock is always ON 39 * ~~~~~~~~~~~~~~~~~~~~~~~~~ 40 */ 41 static int usbhsm_autonomy_get_vbus(struct platform_device *pdev) 42 { 43 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev); 44 45 return VBSTS & usbhs_read(priv, INTSTS0); 46 } 47 48 static int usbhsm_autonomy_irq_vbus(struct usbhs_priv *priv, 49 struct usbhs_irq_state *irq_state) 50 { 51 struct platform_device *pdev = usbhs_priv_to_pdev(priv); 52 53 return usbhsc_drvcllbck_notify_hotplug(pdev); 54 } 55 56 void usbhs_mod_autonomy_mode(struct usbhs_priv *priv) 57 { 58 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 59 60 info->irq_vbus = usbhsm_autonomy_irq_vbus; 61 priv->pfunc->get_vbus = usbhsm_autonomy_get_vbus; 62 63 usbhs_irq_callback_update(priv, NULL); 64 } 65 66 /* 67 * host / gadget functions 68 * 69 * renesas_usbhs host/gadget can register itself by below functions. 70 * these functions are called when probe 71 * 72 */ 73 void usbhs_mod_register(struct usbhs_priv *priv, struct usbhs_mod *mod, int id) 74 { 75 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 76 77 info->mod[id] = mod; 78 mod->priv = priv; 79 } 80 81 struct usbhs_mod *usbhs_mod_get(struct usbhs_priv *priv, int id) 82 { 83 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 84 struct usbhs_mod *ret = NULL; 85 86 switch (id) { 87 case USBHS_HOST: 88 case USBHS_GADGET: 89 ret = info->mod[id]; 90 break; 91 } 92 93 return ret; 94 } 95 96 int usbhs_mod_is_host(struct usbhs_priv *priv, struct usbhs_mod *mod) 97 { 98 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 99 100 if (!mod) 101 return -EINVAL; 102 103 return info->mod[USBHS_HOST] == mod; 104 } 105 106 struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv) 107 { 108 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 109 110 return info->curt; 111 } 112 113 int usbhs_mod_change(struct usbhs_priv *priv, int id) 114 { 115 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 116 struct usbhs_mod *mod = NULL; 117 int ret = 0; 118 119 /* id < 0 mean no current */ 120 switch (id) { 121 case USBHS_HOST: 122 case USBHS_GADGET: 123 mod = info->mod[id]; 124 break; 125 default: 126 ret = -EINVAL; 127 } 128 info->curt = mod; 129 130 return ret; 131 } 132 133 static irqreturn_t usbhs_interrupt(int irq, void *data); 134 int usbhs_mod_probe(struct usbhs_priv *priv) 135 { 136 struct device *dev = usbhs_priv_to_dev(priv); 137 int ret; 138 139 /* 140 * install host/gadget driver 141 */ 142 ret = usbhs_mod_gadget_probe(priv); 143 if (ret < 0) 144 return ret; 145 146 /* irq settings */ 147 ret = request_irq(priv->irq, usbhs_interrupt, 148 IRQF_DISABLED, dev_name(dev), priv); 149 if (ret) { 150 dev_err(dev, "irq request err\n"); 151 goto mod_init_gadget_err; 152 } 153 154 return ret; 155 156 mod_init_gadget_err: 157 usbhs_mod_gadget_remove(priv); 158 159 return ret; 160 } 161 162 void usbhs_mod_remove(struct usbhs_priv *priv) 163 { 164 usbhs_mod_gadget_remove(priv); 165 free_irq(priv->irq, priv); 166 } 167 168 /* 169 * status functions 170 */ 171 int usbhs_status_get_usb_speed(struct usbhs_irq_state *irq_state) 172 { 173 switch (irq_state->dvstctr & RHST) { 174 case RHST_LOW_SPEED: 175 return USB_SPEED_LOW; 176 case RHST_FULL_SPEED: 177 return USB_SPEED_FULL; 178 case RHST_HIGH_SPEED: 179 return USB_SPEED_HIGH; 180 } 181 182 return USB_SPEED_UNKNOWN; 183 } 184 185 int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state) 186 { 187 int state = irq_state->intsts0 & DVSQ_MASK; 188 189 switch (state) { 190 case POWER_STATE: 191 case DEFAULT_STATE: 192 case ADDRESS_STATE: 193 case CONFIGURATION_STATE: 194 return state; 195 } 196 197 return -EIO; 198 } 199 200 int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state) 201 { 202 /* 203 * return value 204 * 205 * IDLE_SETUP_STAGE 206 * READ_DATA_STAGE 207 * READ_STATUS_STAGE 208 * WRITE_DATA_STAGE 209 * WRITE_STATUS_STAGE 210 * NODATA_STATUS_STAGE 211 * SEQUENCE_ERROR 212 */ 213 return (int)irq_state->intsts0 & CTSQ_MASK; 214 } 215 216 static void usbhs_status_get_each_irq(struct usbhs_priv *priv, 217 struct usbhs_irq_state *state) 218 { 219 struct usbhs_mod *mod = usbhs_mod_get_current(priv); 220 221 state->intsts0 = usbhs_read(priv, INTSTS0); 222 state->intsts1 = usbhs_read(priv, INTSTS1); 223 224 state->dvstctr = usbhs_read(priv, DVSTCTR); 225 226 /* mask */ 227 if (mod) { 228 state->brdysts = usbhs_read(priv, BRDYSTS); 229 state->nrdysts = usbhs_read(priv, NRDYSTS); 230 state->bempsts = usbhs_read(priv, BEMPSTS); 231 232 state->bempsts &= mod->irq_bempsts; 233 state->brdysts &= mod->irq_brdysts; 234 } 235 } 236 237 /* 238 * interrupt 239 */ 240 #define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */ 241 #define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */ 242 static irqreturn_t usbhs_interrupt(int irq, void *data) 243 { 244 struct usbhs_priv *priv = data; 245 struct usbhs_irq_state irq_state; 246 247 usbhs_status_get_each_irq(priv, &irq_state); 248 249 /* 250 * clear interrupt 251 * 252 * The hardware is _very_ picky to clear interrupt bit. 253 * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value. 254 * 255 * see 256 * "Operation" 257 * - "Control Transfer (DCP)" 258 * - Function :: VALID bit should 0 259 */ 260 usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC); 261 usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC); 262 263 usbhs_write(priv, BRDYSTS, 0); 264 usbhs_write(priv, NRDYSTS, 0); 265 usbhs_write(priv, BEMPSTS, 0); 266 267 /* 268 * call irq callback functions 269 * see also 270 * usbhs_irq_setting_update 271 */ 272 if (irq_state.intsts0 & VBINT) 273 usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state); 274 275 if (irq_state.intsts0 & DVST) 276 usbhs_mod_call(priv, irq_dev_state, priv, &irq_state); 277 278 if (irq_state.intsts0 & CTRT) 279 usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state); 280 281 if (irq_state.intsts0 & BEMP) 282 usbhs_mod_call(priv, irq_empty, priv, &irq_state); 283 284 if (irq_state.intsts0 & BRDY) 285 usbhs_mod_call(priv, irq_ready, priv, &irq_state); 286 287 return IRQ_HANDLED; 288 } 289 290 void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod) 291 { 292 u16 intenb0 = 0; 293 struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); 294 295 usbhs_write(priv, INTENB0, 0); 296 297 usbhs_write(priv, BEMPENB, 0); 298 usbhs_write(priv, BRDYENB, 0); 299 300 /* 301 * see also 302 * usbhs_interrupt 303 */ 304 305 /* 306 * it don't enable DVSE (intenb0) here 307 * but "mod->irq_dev_state" will be called. 308 */ 309 if (info->irq_vbus) 310 intenb0 |= VBSE; 311 312 if (mod) { 313 if (mod->irq_ctrl_stage) 314 intenb0 |= CTRE; 315 316 if (mod->irq_empty && mod->irq_bempsts) { 317 usbhs_write(priv, BEMPENB, mod->irq_bempsts); 318 intenb0 |= BEMPE; 319 } 320 321 if (mod->irq_ready && mod->irq_brdysts) { 322 usbhs_write(priv, BRDYENB, mod->irq_brdysts); 323 intenb0 |= BRDYE; 324 } 325 } 326 327 usbhs_write(priv, INTENB0, intenb0); 328 } 329