Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 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 | |
| 24 | /* |
| 25 | * host / gadget functions |
| 26 | * |
| 27 | * renesas_usbhs host/gadget can register itself by below functions. |
| 28 | * these functions are called when probe |
| 29 | * |
| 30 | */ |
| 31 | void usbhs_mod_register(struct usbhs_priv *priv, struct usbhs_mod *mod, int id) |
| 32 | { |
| 33 | struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); |
| 34 | |
| 35 | info->mod[id] = mod; |
| 36 | mod->priv = priv; |
| 37 | } |
| 38 | |
| 39 | struct usbhs_mod *usbhs_mod_get(struct usbhs_priv *priv, int id) |
| 40 | { |
| 41 | struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); |
| 42 | struct usbhs_mod *ret = NULL; |
| 43 | |
| 44 | switch (id) { |
| 45 | case USBHS_HOST: |
| 46 | case USBHS_GADGET: |
| 47 | ret = info->mod[id]; |
| 48 | break; |
| 49 | } |
| 50 | |
| 51 | return ret; |
| 52 | } |
| 53 | |
| 54 | int usbhs_mod_is_host(struct usbhs_priv *priv, struct usbhs_mod *mod) |
| 55 | { |
| 56 | struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); |
| 57 | |
| 58 | if (!mod) |
| 59 | return -EINVAL; |
| 60 | |
| 61 | return info->mod[USBHS_HOST] == mod; |
| 62 | } |
| 63 | |
| 64 | struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv) |
| 65 | { |
| 66 | struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); |
| 67 | |
| 68 | return info->curt; |
| 69 | } |
| 70 | |
| 71 | int usbhs_mod_change(struct usbhs_priv *priv, int id) |
| 72 | { |
| 73 | struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv); |
| 74 | struct usbhs_mod *mod = NULL; |
| 75 | int ret = 0; |
| 76 | |
| 77 | /* id < 0 mean no current */ |
| 78 | switch (id) { |
| 79 | case USBHS_HOST: |
| 80 | case USBHS_GADGET: |
| 81 | mod = info->mod[id]; |
| 82 | break; |
| 83 | default: |
| 84 | ret = -EINVAL; |
| 85 | } |
| 86 | info->curt = mod; |
| 87 | |
| 88 | return ret; |
| 89 | } |
| 90 | |
| 91 | static irqreturn_t usbhs_interrupt(int irq, void *data); |
| 92 | int usbhs_mod_probe(struct usbhs_priv *priv) |
| 93 | { |
| 94 | struct device *dev = usbhs_priv_to_dev(priv); |
| 95 | int ret; |
| 96 | |
Kuninori Morimoto | 2f98382 | 2011-04-05 11:40:54 +0900 | [diff] [blame] | 97 | /* |
| 98 | * install host/gadget driver |
| 99 | */ |
| 100 | ret = usbhs_mod_gadget_probe(priv); |
| 101 | if (ret < 0) |
| 102 | return ret; |
| 103 | |
Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 104 | /* irq settings */ |
| 105 | ret = request_irq(priv->irq, usbhs_interrupt, |
| 106 | IRQF_DISABLED, dev_name(dev), priv); |
Kuninori Morimoto | 2f98382 | 2011-04-05 11:40:54 +0900 | [diff] [blame] | 107 | if (ret) { |
Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 108 | dev_err(dev, "irq request err\n"); |
Kuninori Morimoto | 2f98382 | 2011-04-05 11:40:54 +0900 | [diff] [blame] | 109 | goto mod_init_gadget_err; |
| 110 | } |
| 111 | |
| 112 | return ret; |
| 113 | |
| 114 | mod_init_gadget_err: |
| 115 | usbhs_mod_gadget_remove(priv); |
Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 116 | |
| 117 | return ret; |
| 118 | } |
| 119 | |
| 120 | void usbhs_mod_remove(struct usbhs_priv *priv) |
| 121 | { |
Kuninori Morimoto | 2f98382 | 2011-04-05 11:40:54 +0900 | [diff] [blame] | 122 | usbhs_mod_gadget_remove(priv); |
Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 123 | free_irq(priv->irq, priv); |
| 124 | } |
| 125 | |
| 126 | /* |
| 127 | * status functions |
| 128 | */ |
| 129 | int usbhs_status_get_usb_speed(struct usbhs_irq_state *irq_state) |
| 130 | { |
| 131 | switch (irq_state->dvstctr & RHST) { |
| 132 | case RHST_LOW_SPEED: |
| 133 | return USB_SPEED_LOW; |
| 134 | case RHST_FULL_SPEED: |
| 135 | return USB_SPEED_FULL; |
| 136 | case RHST_HIGH_SPEED: |
| 137 | return USB_SPEED_HIGH; |
| 138 | } |
| 139 | |
| 140 | return USB_SPEED_UNKNOWN; |
| 141 | } |
| 142 | |
| 143 | int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state) |
| 144 | { |
| 145 | int state = irq_state->intsts0 & DVSQ_MASK; |
| 146 | |
| 147 | switch (state) { |
| 148 | case POWER_STATE: |
| 149 | case DEFAULT_STATE: |
| 150 | case ADDRESS_STATE: |
| 151 | case CONFIGURATION_STATE: |
| 152 | return state; |
| 153 | } |
| 154 | |
| 155 | return -EIO; |
| 156 | } |
| 157 | |
| 158 | int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state) |
| 159 | { |
| 160 | /* |
| 161 | * return value |
| 162 | * |
| 163 | * IDLE_SETUP_STAGE |
| 164 | * READ_DATA_STAGE |
| 165 | * READ_STATUS_STAGE |
| 166 | * WRITE_DATA_STAGE |
| 167 | * WRITE_STATUS_STAGE |
| 168 | * NODATA_STATUS_STAGE |
| 169 | * SEQUENCE_ERROR |
| 170 | */ |
| 171 | return (int)irq_state->intsts0 & CTSQ_MASK; |
| 172 | } |
| 173 | |
| 174 | static void usbhs_status_get_each_irq(struct usbhs_priv *priv, |
| 175 | struct usbhs_irq_state *state) |
| 176 | { |
| 177 | struct usbhs_mod *mod = usbhs_mod_get_current(priv); |
| 178 | |
| 179 | state->intsts0 = usbhs_read(priv, INTSTS0); |
| 180 | state->intsts1 = usbhs_read(priv, INTSTS1); |
| 181 | |
Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 182 | state->dvstctr = usbhs_read(priv, DVSTCTR); |
| 183 | |
| 184 | /* mask */ |
Kuninori Morimoto | 5ea68d5 | 2011-04-28 16:41:07 +0900 | [diff] [blame] | 185 | if (mod) { |
| 186 | state->brdysts = usbhs_read(priv, BRDYSTS); |
| 187 | state->nrdysts = usbhs_read(priv, NRDYSTS); |
| 188 | state->bempsts = usbhs_read(priv, BEMPSTS); |
| 189 | |
| 190 | state->bempsts &= mod->irq_bempsts; |
| 191 | state->brdysts &= mod->irq_brdysts; |
| 192 | } |
Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | /* |
| 196 | * interrupt |
| 197 | */ |
| 198 | #define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */ |
| 199 | #define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */ |
| 200 | static irqreturn_t usbhs_interrupt(int irq, void *data) |
| 201 | { |
| 202 | struct usbhs_priv *priv = data; |
| 203 | struct usbhs_irq_state irq_state; |
| 204 | |
| 205 | usbhs_status_get_each_irq(priv, &irq_state); |
| 206 | |
| 207 | /* |
| 208 | * clear interrupt |
| 209 | * |
| 210 | * The hardware is _very_ picky to clear interrupt bit. |
| 211 | * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value. |
| 212 | * |
| 213 | * see |
| 214 | * "Operation" |
| 215 | * - "Control Transfer (DCP)" |
| 216 | * - Function :: VALID bit should 0 |
| 217 | */ |
| 218 | usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC); |
| 219 | usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC); |
| 220 | |
| 221 | usbhs_write(priv, BRDYSTS, 0); |
| 222 | usbhs_write(priv, NRDYSTS, 0); |
| 223 | usbhs_write(priv, BEMPSTS, 0); |
| 224 | |
| 225 | /* |
| 226 | * call irq callback functions |
| 227 | * see also |
| 228 | * usbhs_irq_setting_update |
| 229 | */ |
| 230 | if (irq_state.intsts0 & DVST) |
| 231 | usbhs_mod_call(priv, irq_dev_state, priv, &irq_state); |
| 232 | |
| 233 | if (irq_state.intsts0 & CTRT) |
| 234 | usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state); |
| 235 | |
| 236 | if (irq_state.intsts0 & BEMP) |
| 237 | usbhs_mod_call(priv, irq_empty, priv, &irq_state); |
| 238 | |
| 239 | if (irq_state.intsts0 & BRDY) |
| 240 | usbhs_mod_call(priv, irq_ready, priv, &irq_state); |
| 241 | |
| 242 | return IRQ_HANDLED; |
| 243 | } |
| 244 | |
| 245 | void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod) |
| 246 | { |
| 247 | u16 intenb0 = 0; |
| 248 | |
| 249 | usbhs_write(priv, INTENB0, 0); |
| 250 | |
| 251 | usbhs_write(priv, BEMPENB, 0); |
| 252 | usbhs_write(priv, BRDYENB, 0); |
| 253 | |
| 254 | /* |
| 255 | * see also |
| 256 | * usbhs_interrupt |
| 257 | */ |
| 258 | |
| 259 | /* |
| 260 | * it don't enable DVSE (intenb0) here |
| 261 | * but "mod->irq_dev_state" will be called. |
| 262 | */ |
| 263 | |
Kuninori Morimoto | 5ea68d5 | 2011-04-28 16:41:07 +0900 | [diff] [blame] | 264 | if (mod) { |
| 265 | if (mod->irq_ctrl_stage) |
| 266 | intenb0 |= CTRE; |
Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 267 | |
Kuninori Morimoto | 5ea68d5 | 2011-04-28 16:41:07 +0900 | [diff] [blame] | 268 | if (mod->irq_empty && mod->irq_bempsts) { |
| 269 | usbhs_write(priv, BEMPENB, mod->irq_bempsts); |
| 270 | intenb0 |= BEMPE; |
| 271 | } |
Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 272 | |
Kuninori Morimoto | 5ea68d5 | 2011-04-28 16:41:07 +0900 | [diff] [blame] | 273 | if (mod->irq_ready && mod->irq_brdysts) { |
| 274 | usbhs_write(priv, BRDYENB, mod->irq_brdysts); |
| 275 | intenb0 |= BRDYE; |
| 276 | } |
Kuninori Morimoto | f1407d5 | 2011-04-04 13:44:59 +0900 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | usbhs_write(priv, INTENB0, intenb0); |
| 280 | } |