Sylvain Munaut | 7acb939 | 2007-09-16 20:53:30 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Driver for MPC52xx processor BestComm General Buffer Descriptor |
| 3 | * |
| 4 | * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com> |
| 5 | * Copyright (C) 2006 AppSpec Computer Technologies Corp. |
| 6 | * Jeff Gibbons <jeff.gibbons@appspec.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License version 2 as published |
| 10 | * by the Free Software Foundation. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include <linux/version.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <asm/errno.h> |
| 20 | #include <asm/io.h> |
| 21 | |
| 22 | #include <asm/mpc52xx.h> |
Grant Likely | 7ba6d6d | 2008-07-01 21:38:16 -0600 | [diff] [blame^] | 23 | #include <asm/mpc52xx_psc.h> |
Sylvain Munaut | 7acb939 | 2007-09-16 20:53:30 +1000 | [diff] [blame] | 24 | |
| 25 | #include "bestcomm.h" |
| 26 | #include "bestcomm_priv.h" |
| 27 | #include "gen_bd.h" |
| 28 | |
| 29 | |
| 30 | /* ======================================================================== */ |
| 31 | /* Task image/var/inc */ |
| 32 | /* ======================================================================== */ |
| 33 | |
| 34 | /* gen_bd tasks images */ |
| 35 | extern u32 bcom_gen_bd_rx_task[]; |
| 36 | extern u32 bcom_gen_bd_tx_task[]; |
| 37 | |
| 38 | /* rx task vars that need to be set before enabling the task */ |
| 39 | struct bcom_gen_bd_rx_var { |
| 40 | u32 enable; /* (u16*) address of task's control register */ |
| 41 | u32 fifo; /* (u32*) address of gen_bd's fifo */ |
| 42 | u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ |
| 43 | u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ |
| 44 | u32 bd_start; /* (struct bcom_bd*) current bd */ |
| 45 | u32 buffer_size; /* size of receive buffer */ |
| 46 | }; |
| 47 | |
| 48 | /* rx task incs that need to be set before enabling the task */ |
| 49 | struct bcom_gen_bd_rx_inc { |
| 50 | u16 pad0; |
| 51 | s16 incr_bytes; |
| 52 | u16 pad1; |
| 53 | s16 incr_dst; |
| 54 | }; |
| 55 | |
| 56 | /* tx task vars that need to be set before enabling the task */ |
| 57 | struct bcom_gen_bd_tx_var { |
| 58 | u32 fifo; /* (u32*) address of gen_bd's fifo */ |
| 59 | u32 enable; /* (u16*) address of task's control register */ |
| 60 | u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ |
| 61 | u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ |
| 62 | u32 bd_start; /* (struct bcom_bd*) current bd */ |
| 63 | u32 buffer_size; /* set by uCode for each packet */ |
| 64 | }; |
| 65 | |
| 66 | /* tx task incs that need to be set before enabling the task */ |
| 67 | struct bcom_gen_bd_tx_inc { |
| 68 | u16 pad0; |
| 69 | s16 incr_bytes; |
| 70 | u16 pad1; |
| 71 | s16 incr_src; |
| 72 | u16 pad2; |
| 73 | s16 incr_src_ma; |
| 74 | }; |
| 75 | |
| 76 | /* private structure */ |
| 77 | struct bcom_gen_bd_priv { |
| 78 | phys_addr_t fifo; |
| 79 | int initiator; |
| 80 | int ipr; |
| 81 | int maxbufsize; |
| 82 | }; |
| 83 | |
| 84 | |
| 85 | /* ======================================================================== */ |
| 86 | /* Task support code */ |
| 87 | /* ======================================================================== */ |
| 88 | |
| 89 | struct bcom_task * |
| 90 | bcom_gen_bd_rx_init(int queue_len, phys_addr_t fifo, |
| 91 | int initiator, int ipr, int maxbufsize) |
| 92 | { |
| 93 | struct bcom_task *tsk; |
| 94 | struct bcom_gen_bd_priv *priv; |
| 95 | |
| 96 | tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), |
| 97 | sizeof(struct bcom_gen_bd_priv)); |
| 98 | if (!tsk) |
| 99 | return NULL; |
| 100 | |
| 101 | tsk->flags = BCOM_FLAGS_NONE; |
| 102 | |
| 103 | priv = tsk->priv; |
| 104 | priv->fifo = fifo; |
| 105 | priv->initiator = initiator; |
| 106 | priv->ipr = ipr; |
| 107 | priv->maxbufsize = maxbufsize; |
| 108 | |
| 109 | if (bcom_gen_bd_rx_reset(tsk)) { |
| 110 | bcom_task_free(tsk); |
| 111 | return NULL; |
| 112 | } |
| 113 | |
| 114 | return tsk; |
| 115 | } |
| 116 | EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_init); |
| 117 | |
| 118 | int |
| 119 | bcom_gen_bd_rx_reset(struct bcom_task *tsk) |
| 120 | { |
| 121 | struct bcom_gen_bd_priv *priv = tsk->priv; |
| 122 | struct bcom_gen_bd_rx_var *var; |
| 123 | struct bcom_gen_bd_rx_inc *inc; |
| 124 | |
| 125 | /* Shutdown the task */ |
| 126 | bcom_disable_task(tsk->tasknum); |
| 127 | |
| 128 | /* Reset the microcode */ |
| 129 | var = (struct bcom_gen_bd_rx_var *) bcom_task_var(tsk->tasknum); |
| 130 | inc = (struct bcom_gen_bd_rx_inc *) bcom_task_inc(tsk->tasknum); |
| 131 | |
| 132 | if (bcom_load_image(tsk->tasknum, bcom_gen_bd_rx_task)) |
| 133 | return -1; |
| 134 | |
| 135 | var->enable = bcom_eng->regs_base + |
| 136 | offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); |
| 137 | var->fifo = (u32) priv->fifo; |
| 138 | var->bd_base = tsk->bd_pa; |
| 139 | var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); |
| 140 | var->bd_start = tsk->bd_pa; |
| 141 | var->buffer_size = priv->maxbufsize; |
| 142 | |
| 143 | inc->incr_bytes = -(s16)sizeof(u32); |
| 144 | inc->incr_dst = sizeof(u32); |
| 145 | |
| 146 | /* Reset the BDs */ |
| 147 | tsk->index = 0; |
| 148 | tsk->outdex = 0; |
| 149 | |
| 150 | memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); |
| 151 | |
| 152 | /* Configure some stuff */ |
| 153 | bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_RX_BD_PRAGMA); |
| 154 | bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); |
| 155 | |
| 156 | out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr); |
| 157 | bcom_set_initiator(tsk->tasknum, priv->initiator); |
| 158 | |
| 159 | out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_reset); |
| 164 | |
| 165 | void |
| 166 | bcom_gen_bd_rx_release(struct bcom_task *tsk) |
| 167 | { |
| 168 | /* Nothing special for the GenBD tasks */ |
| 169 | bcom_task_free(tsk); |
| 170 | } |
| 171 | EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_release); |
| 172 | |
| 173 | |
| 174 | extern struct bcom_task * |
| 175 | bcom_gen_bd_tx_init(int queue_len, phys_addr_t fifo, |
| 176 | int initiator, int ipr) |
| 177 | { |
| 178 | struct bcom_task *tsk; |
| 179 | struct bcom_gen_bd_priv *priv; |
| 180 | |
| 181 | tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), |
| 182 | sizeof(struct bcom_gen_bd_priv)); |
| 183 | if (!tsk) |
| 184 | return NULL; |
| 185 | |
| 186 | tsk->flags = BCOM_FLAGS_NONE; |
| 187 | |
| 188 | priv = tsk->priv; |
| 189 | priv->fifo = fifo; |
| 190 | priv->initiator = initiator; |
| 191 | priv->ipr = ipr; |
| 192 | |
| 193 | if (bcom_gen_bd_tx_reset(tsk)) { |
| 194 | bcom_task_free(tsk); |
| 195 | return NULL; |
| 196 | } |
| 197 | |
| 198 | return tsk; |
| 199 | } |
| 200 | EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_init); |
| 201 | |
| 202 | int |
| 203 | bcom_gen_bd_tx_reset(struct bcom_task *tsk) |
| 204 | { |
| 205 | struct bcom_gen_bd_priv *priv = tsk->priv; |
| 206 | struct bcom_gen_bd_tx_var *var; |
| 207 | struct bcom_gen_bd_tx_inc *inc; |
| 208 | |
| 209 | /* Shutdown the task */ |
| 210 | bcom_disable_task(tsk->tasknum); |
| 211 | |
| 212 | /* Reset the microcode */ |
| 213 | var = (struct bcom_gen_bd_tx_var *) bcom_task_var(tsk->tasknum); |
| 214 | inc = (struct bcom_gen_bd_tx_inc *) bcom_task_inc(tsk->tasknum); |
| 215 | |
| 216 | if (bcom_load_image(tsk->tasknum, bcom_gen_bd_tx_task)) |
| 217 | return -1; |
| 218 | |
| 219 | var->enable = bcom_eng->regs_base + |
| 220 | offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); |
| 221 | var->fifo = (u32) priv->fifo; |
| 222 | var->bd_base = tsk->bd_pa; |
| 223 | var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); |
| 224 | var->bd_start = tsk->bd_pa; |
| 225 | |
| 226 | inc->incr_bytes = -(s16)sizeof(u32); |
| 227 | inc->incr_src = sizeof(u32); |
| 228 | inc->incr_src_ma = sizeof(u8); |
| 229 | |
| 230 | /* Reset the BDs */ |
| 231 | tsk->index = 0; |
| 232 | tsk->outdex = 0; |
| 233 | |
| 234 | memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); |
| 235 | |
| 236 | /* Configure some stuff */ |
| 237 | bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_TX_BD_PRAGMA); |
| 238 | bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); |
| 239 | |
| 240 | out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr); |
| 241 | bcom_set_initiator(tsk->tasknum, priv->initiator); |
| 242 | |
| 243 | out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_reset); |
| 248 | |
| 249 | void |
| 250 | bcom_gen_bd_tx_release(struct bcom_task *tsk) |
| 251 | { |
| 252 | /* Nothing special for the GenBD tasks */ |
| 253 | bcom_task_free(tsk); |
| 254 | } |
| 255 | EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_release); |
| 256 | |
Grant Likely | 7ba6d6d | 2008-07-01 21:38:16 -0600 | [diff] [blame^] | 257 | /* --------------------------------------------------------------------- |
| 258 | * PSC support code |
| 259 | */ |
| 260 | |
| 261 | /** |
| 262 | * bcom_psc_parameters - Bestcomm initialization value table for PSC devices |
| 263 | * |
| 264 | * This structure is only used internally. It is a lookup table for PSC |
| 265 | * specific parameters to bestcomm tasks. |
| 266 | */ |
| 267 | static struct bcom_psc_params { |
| 268 | int rx_initiator; |
| 269 | int rx_ipr; |
| 270 | int tx_initiator; |
| 271 | int tx_ipr; |
| 272 | } bcom_psc_params[] = { |
| 273 | [0] = { |
| 274 | .rx_initiator = BCOM_INITIATOR_PSC1_RX, |
| 275 | .rx_ipr = BCOM_IPR_PSC1_RX, |
| 276 | .tx_initiator = BCOM_INITIATOR_PSC1_TX, |
| 277 | .tx_ipr = BCOM_IPR_PSC1_TX, |
| 278 | }, |
| 279 | [1] = { |
| 280 | .rx_initiator = BCOM_INITIATOR_PSC2_RX, |
| 281 | .rx_ipr = BCOM_IPR_PSC2_RX, |
| 282 | .tx_initiator = BCOM_INITIATOR_PSC2_TX, |
| 283 | .tx_ipr = BCOM_IPR_PSC2_TX, |
| 284 | }, |
| 285 | [2] = { |
| 286 | .rx_initiator = BCOM_INITIATOR_PSC3_RX, |
| 287 | .rx_ipr = BCOM_IPR_PSC3_RX, |
| 288 | .tx_initiator = BCOM_INITIATOR_PSC3_TX, |
| 289 | .tx_ipr = BCOM_IPR_PSC3_TX, |
| 290 | }, |
| 291 | [3] = { |
| 292 | .rx_initiator = BCOM_INITIATOR_PSC4_RX, |
| 293 | .rx_ipr = BCOM_IPR_PSC4_RX, |
| 294 | .tx_initiator = BCOM_INITIATOR_PSC4_TX, |
| 295 | .tx_ipr = BCOM_IPR_PSC4_TX, |
| 296 | }, |
| 297 | [4] = { |
| 298 | .rx_initiator = BCOM_INITIATOR_PSC5_RX, |
| 299 | .rx_ipr = BCOM_IPR_PSC5_RX, |
| 300 | .tx_initiator = BCOM_INITIATOR_PSC5_TX, |
| 301 | .tx_ipr = BCOM_IPR_PSC5_TX, |
| 302 | }, |
| 303 | [5] = { |
| 304 | .rx_initiator = BCOM_INITIATOR_PSC6_RX, |
| 305 | .rx_ipr = BCOM_IPR_PSC6_RX, |
| 306 | .tx_initiator = BCOM_INITIATOR_PSC6_TX, |
| 307 | .tx_ipr = BCOM_IPR_PSC6_TX, |
| 308 | }, |
| 309 | }; |
| 310 | |
| 311 | /** |
| 312 | * bcom_psc_gen_bd_rx_init - Allocate a receive bcom_task for a PSC port |
| 313 | * @psc_num: Number of the PSC to allocate a task for |
| 314 | * @queue_len: number of buffer descriptors to allocate for the task |
| 315 | * @fifo: physical address of FIFO register |
| 316 | * @maxbufsize: Maximum receive data size in bytes. |
| 317 | * |
| 318 | * Allocate a bestcomm task structure for receiving data from a PSC. |
| 319 | */ |
| 320 | struct bcom_task * bcom_psc_gen_bd_rx_init(unsigned psc_num, int queue_len, |
| 321 | phys_addr_t fifo, int maxbufsize) |
| 322 | { |
| 323 | if (psc_num >= MPC52xx_PSC_MAXNUM) |
| 324 | return NULL; |
| 325 | |
| 326 | return bcom_gen_bd_rx_init(queue_len, fifo, |
| 327 | bcom_psc_params[psc_num].rx_initiator, |
| 328 | bcom_psc_params[psc_num].rx_ipr, |
| 329 | maxbufsize); |
| 330 | } |
| 331 | EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_rx_init); |
| 332 | |
| 333 | /** |
| 334 | * bcom_psc_gen_bd_tx_init - Allocate a transmit bcom_task for a PSC port |
| 335 | * @psc_num: Number of the PSC to allocate a task for |
| 336 | * @queue_len: number of buffer descriptors to allocate for the task |
| 337 | * @fifo: physical address of FIFO register |
| 338 | * |
| 339 | * Allocate a bestcomm task structure for transmitting data to a PSC. |
| 340 | */ |
| 341 | struct bcom_task * |
| 342 | bcom_psc_gen_bd_tx_init(unsigned psc_num, int queue_len, phys_addr_t fifo) |
| 343 | { |
| 344 | struct psc; |
| 345 | return bcom_gen_bd_tx_init(queue_len, fifo, |
| 346 | bcom_psc_params[psc_num].tx_initiator, |
| 347 | bcom_psc_params[psc_num].tx_ipr); |
| 348 | } |
| 349 | EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_tx_init); |
| 350 | |
Sylvain Munaut | 7acb939 | 2007-09-16 20:53:30 +1000 | [diff] [blame] | 351 | |
| 352 | MODULE_DESCRIPTION("BestComm General Buffer Descriptor tasks driver"); |
| 353 | MODULE_AUTHOR("Jeff Gibbons <jeff.gibbons@appspec.com>"); |
| 354 | MODULE_LICENSE("GPL v2"); |
| 355 | |