Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 1 | /* |
| 2 | * MPC85xx RapidIO support |
| 3 | * |
| 4 | * Copyright 2005 MontaVista Software, Inc. |
| 5 | * Matt Porter <mporter@kernel.crashing.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | */ |
| 12 | |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 13 | #include <linux/init.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/dma-mapping.h> |
| 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/rio.h> |
| 19 | #include <linux/rio_drv.h> |
| 20 | |
| 21 | #include <asm/io.h> |
| 22 | |
| 23 | #define RIO_REGS_BASE (CCSRBAR + 0xc0000) |
| 24 | #define RIO_ATMU_REGS_OFFSET 0x10c00 |
| 25 | #define RIO_MSG_REGS_OFFSET 0x11000 |
| 26 | #define RIO_MAINT_WIN_SIZE 0x400000 |
| 27 | #define RIO_DBELL_WIN_SIZE 0x1000 |
| 28 | |
| 29 | #define RIO_MSG_OMR_MUI 0x00000002 |
| 30 | #define RIO_MSG_OSR_TE 0x00000080 |
| 31 | #define RIO_MSG_OSR_QOI 0x00000020 |
| 32 | #define RIO_MSG_OSR_QFI 0x00000010 |
| 33 | #define RIO_MSG_OSR_MUB 0x00000004 |
| 34 | #define RIO_MSG_OSR_EOMI 0x00000002 |
| 35 | #define RIO_MSG_OSR_QEI 0x00000001 |
| 36 | |
| 37 | #define RIO_MSG_IMR_MI 0x00000002 |
| 38 | #define RIO_MSG_ISR_TE 0x00000080 |
| 39 | #define RIO_MSG_ISR_QFI 0x00000010 |
| 40 | #define RIO_MSG_ISR_DIQI 0x00000001 |
| 41 | |
| 42 | #define RIO_MSG_DESC_SIZE 32 |
| 43 | #define RIO_MSG_BUFFER_SIZE 4096 |
| 44 | #define RIO_MIN_TX_RING_SIZE 2 |
| 45 | #define RIO_MAX_TX_RING_SIZE 2048 |
| 46 | #define RIO_MIN_RX_RING_SIZE 2 |
| 47 | #define RIO_MAX_RX_RING_SIZE 2048 |
| 48 | |
| 49 | #define DOORBELL_DMR_DI 0x00000002 |
| 50 | #define DOORBELL_DSR_TE 0x00000080 |
| 51 | #define DOORBELL_DSR_QFI 0x00000010 |
| 52 | #define DOORBELL_DSR_DIQI 0x00000001 |
| 53 | #define DOORBELL_TID_OFFSET 0x03 |
| 54 | #define DOORBELL_SID_OFFSET 0x05 |
| 55 | #define DOORBELL_INFO_OFFSET 0x06 |
| 56 | |
| 57 | #define DOORBELL_MESSAGE_SIZE 0x08 |
| 58 | #define DBELL_SID(x) (*(u8 *)(x + DOORBELL_SID_OFFSET)) |
| 59 | #define DBELL_TID(x) (*(u8 *)(x + DOORBELL_TID_OFFSET)) |
| 60 | #define DBELL_INF(x) (*(u16 *)(x + DOORBELL_INFO_OFFSET)) |
| 61 | |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 62 | struct rio_atmu_regs { |
| 63 | u32 rowtar; |
| 64 | u32 pad1; |
| 65 | u32 rowbar; |
| 66 | u32 pad2; |
| 67 | u32 rowar; |
| 68 | u32 pad3[3]; |
| 69 | }; |
| 70 | |
| 71 | struct rio_msg_regs { |
| 72 | u32 omr; |
| 73 | u32 osr; |
| 74 | u32 pad1; |
| 75 | u32 odqdpar; |
| 76 | u32 pad2; |
| 77 | u32 osar; |
| 78 | u32 odpr; |
| 79 | u32 odatr; |
| 80 | u32 odcr; |
| 81 | u32 pad3; |
| 82 | u32 odqepar; |
| 83 | u32 pad4[13]; |
| 84 | u32 imr; |
| 85 | u32 isr; |
| 86 | u32 pad5; |
| 87 | u32 ifqdpar; |
| 88 | u32 pad6; |
| 89 | u32 ifqepar; |
| 90 | u32 pad7[250]; |
| 91 | u32 dmr; |
| 92 | u32 dsr; |
| 93 | u32 pad8; |
| 94 | u32 dqdpar; |
| 95 | u32 pad9; |
| 96 | u32 dqepar; |
| 97 | u32 pad10[26]; |
| 98 | u32 pwmr; |
| 99 | u32 pwsr; |
| 100 | u32 pad11; |
| 101 | u32 pwqbar; |
| 102 | }; |
| 103 | |
| 104 | struct rio_tx_desc { |
| 105 | u32 res1; |
| 106 | u32 saddr; |
| 107 | u32 dport; |
| 108 | u32 dattr; |
| 109 | u32 res2; |
| 110 | u32 res3; |
| 111 | u32 dwcnt; |
| 112 | u32 res4; |
| 113 | }; |
| 114 | |
| 115 | static u32 regs_win; |
| 116 | static struct rio_atmu_regs *atmu_regs; |
| 117 | static struct rio_atmu_regs *maint_atmu_regs; |
| 118 | static struct rio_atmu_regs *dbell_atmu_regs; |
| 119 | static u32 dbell_win; |
| 120 | static u32 maint_win; |
| 121 | static struct rio_msg_regs *msg_regs; |
| 122 | |
| 123 | static struct rio_dbell_ring { |
| 124 | void *virt; |
| 125 | dma_addr_t phys; |
| 126 | } dbell_ring; |
| 127 | |
| 128 | static struct rio_msg_tx_ring { |
| 129 | void *virt; |
| 130 | dma_addr_t phys; |
| 131 | void *virt_buffer[RIO_MAX_TX_RING_SIZE]; |
| 132 | dma_addr_t phys_buffer[RIO_MAX_TX_RING_SIZE]; |
| 133 | int tx_slot; |
| 134 | int size; |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 135 | void *dev_id; |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 136 | } msg_tx_ring; |
| 137 | |
| 138 | static struct rio_msg_rx_ring { |
| 139 | void *virt; |
| 140 | dma_addr_t phys; |
| 141 | void *virt_buffer[RIO_MAX_RX_RING_SIZE]; |
| 142 | int rx_slot; |
| 143 | int size; |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 144 | void *dev_id; |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 145 | } msg_rx_ring; |
| 146 | |
| 147 | /** |
| 148 | * mpc85xx_rio_doorbell_send - Send a MPC85xx doorbell message |
| 149 | * @index: ID of RapidIO interface |
| 150 | * @destid: Destination ID of target device |
| 151 | * @data: 16-bit info field of RapidIO doorbell message |
| 152 | * |
| 153 | * Sends a MPC85xx doorbell message. Returns %0 on success or |
| 154 | * %-EINVAL on failure. |
| 155 | */ |
| 156 | static int mpc85xx_rio_doorbell_send(int index, u16 destid, u16 data) |
| 157 | { |
| 158 | pr_debug("mpc85xx_doorbell_send: index %d destid %4.4x data %4.4x\n", |
| 159 | index, destid, data); |
| 160 | out_be32((void *)&dbell_atmu_regs->rowtar, destid << 22); |
| 161 | out_be16((void *)(dbell_win), data); |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * mpc85xx_local_config_read - Generate a MPC85xx local config space read |
| 168 | * @index: ID of RapdiIO interface |
| 169 | * @offset: Offset into configuration space |
| 170 | * @len: Length (in bytes) of the maintenance transaction |
| 171 | * @data: Value to be read into |
| 172 | * |
| 173 | * Generates a MPC85xx local configuration space read. Returns %0 on |
| 174 | * success or %-EINVAL on failure. |
| 175 | */ |
| 176 | static int mpc85xx_local_config_read(int index, u32 offset, int len, u32 * data) |
| 177 | { |
| 178 | pr_debug("mpc85xx_local_config_read: index %d offset %8.8x\n", index, |
| 179 | offset); |
| 180 | *data = in_be32((void *)(regs_win + offset)); |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * mpc85xx_local_config_write - Generate a MPC85xx local config space write |
| 187 | * @index: ID of RapdiIO interface |
| 188 | * @offset: Offset into configuration space |
| 189 | * @len: Length (in bytes) of the maintenance transaction |
| 190 | * @data: Value to be written |
| 191 | * |
| 192 | * Generates a MPC85xx local configuration space write. Returns %0 on |
| 193 | * success or %-EINVAL on failure. |
| 194 | */ |
| 195 | static int mpc85xx_local_config_write(int index, u32 offset, int len, u32 data) |
| 196 | { |
| 197 | pr_debug |
| 198 | ("mpc85xx_local_config_write: index %d offset %8.8x data %8.8x\n", |
| 199 | index, offset, data); |
| 200 | out_be32((void *)(regs_win + offset), data); |
| 201 | |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * mpc85xx_rio_config_read - Generate a MPC85xx read maintenance transaction |
| 207 | * @index: ID of RapdiIO interface |
| 208 | * @destid: Destination ID of transaction |
| 209 | * @hopcount: Number of hops to target device |
| 210 | * @offset: Offset into configuration space |
| 211 | * @len: Length (in bytes) of the maintenance transaction |
| 212 | * @val: Location to be read into |
| 213 | * |
| 214 | * Generates a MPC85xx read maintenance transaction. Returns %0 on |
| 215 | * success or %-EINVAL on failure. |
| 216 | */ |
| 217 | static int |
| 218 | mpc85xx_rio_config_read(int index, u16 destid, u8 hopcount, u32 offset, int len, |
| 219 | u32 * val) |
| 220 | { |
| 221 | u8 *data; |
| 222 | |
| 223 | pr_debug |
| 224 | ("mpc85xx_rio_config_read: index %d destid %d hopcount %d offset %8.8x len %d\n", |
| 225 | index, destid, hopcount, offset, len); |
| 226 | out_be32((void *)&maint_atmu_regs->rowtar, |
| 227 | (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9)); |
| 228 | |
| 229 | data = (u8 *) maint_win + offset; |
| 230 | switch (len) { |
| 231 | case 1: |
| 232 | *val = in_8((u8 *) data); |
| 233 | break; |
| 234 | case 2: |
| 235 | *val = in_be16((u16 *) data); |
| 236 | break; |
| 237 | default: |
| 238 | *val = in_be32((u32 *) data); |
| 239 | break; |
| 240 | } |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * mpc85xx_rio_config_write - Generate a MPC85xx write maintenance transaction |
| 247 | * @index: ID of RapdiIO interface |
| 248 | * @destid: Destination ID of transaction |
| 249 | * @hopcount: Number of hops to target device |
| 250 | * @offset: Offset into configuration space |
| 251 | * @len: Length (in bytes) of the maintenance transaction |
| 252 | * @val: Value to be written |
| 253 | * |
| 254 | * Generates an MPC85xx write maintenance transaction. Returns %0 on |
| 255 | * success or %-EINVAL on failure. |
| 256 | */ |
| 257 | static int |
| 258 | mpc85xx_rio_config_write(int index, u16 destid, u8 hopcount, u32 offset, |
| 259 | int len, u32 val) |
| 260 | { |
| 261 | u8 *data; |
| 262 | pr_debug |
| 263 | ("mpc85xx_rio_config_write: index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n", |
| 264 | index, destid, hopcount, offset, len, val); |
| 265 | out_be32((void *)&maint_atmu_regs->rowtar, |
| 266 | (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9)); |
| 267 | |
| 268 | data = (u8 *) maint_win + offset; |
| 269 | switch (len) { |
| 270 | case 1: |
| 271 | out_8((u8 *) data, val); |
| 272 | break; |
| 273 | case 2: |
| 274 | out_be16((u16 *) data, val); |
| 275 | break; |
| 276 | default: |
| 277 | out_be32((u32 *) data, val); |
| 278 | break; |
| 279 | } |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | /** |
| 285 | * rio_hw_add_outb_message - Add message to the MPC85xx outbound message queue |
| 286 | * @mport: Master port with outbound message queue |
| 287 | * @rdev: Target of outbound message |
| 288 | * @mbox: Outbound mailbox |
| 289 | * @buffer: Message to add to outbound queue |
| 290 | * @len: Length of message |
| 291 | * |
| 292 | * Adds the @buffer message to the MPC85xx outbound message queue. Returns |
| 293 | * %0 on success or %-EINVAL on failure. |
| 294 | */ |
| 295 | int |
| 296 | rio_hw_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox, |
| 297 | void *buffer, size_t len) |
| 298 | { |
| 299 | u32 omr; |
| 300 | struct rio_tx_desc *desc = |
| 301 | (struct rio_tx_desc *)msg_tx_ring.virt + msg_tx_ring.tx_slot; |
| 302 | int ret = 0; |
| 303 | |
| 304 | pr_debug |
| 305 | ("RIO: rio_hw_add_outb_message(): destid %4.4x mbox %d buffer %8.8x len %8.8x\n", |
| 306 | rdev->destid, mbox, (int)buffer, len); |
| 307 | |
| 308 | if ((len < 8) || (len > RIO_MAX_MSG_SIZE)) { |
| 309 | ret = -EINVAL; |
| 310 | goto out; |
| 311 | } |
| 312 | |
| 313 | /* Copy and clear rest of buffer */ |
| 314 | memcpy(msg_tx_ring.virt_buffer[msg_tx_ring.tx_slot], buffer, len); |
| 315 | if (len < (RIO_MAX_MSG_SIZE - 4)) |
| 316 | memset((void *)((u32) msg_tx_ring. |
| 317 | virt_buffer[msg_tx_ring.tx_slot] + len), 0, |
| 318 | RIO_MAX_MSG_SIZE - len); |
| 319 | |
| 320 | /* Set mbox field for message */ |
| 321 | desc->dport = mbox & 0x3; |
| 322 | |
| 323 | /* Enable EOMI interrupt, set priority, and set destid */ |
| 324 | desc->dattr = 0x28000000 | (rdev->destid << 2); |
| 325 | |
| 326 | /* Set transfer size aligned to next power of 2 (in double words) */ |
| 327 | desc->dwcnt = is_power_of_2(len) ? len : 1 << get_bitmask_order(len); |
| 328 | |
| 329 | /* Set snooping and source buffer address */ |
| 330 | desc->saddr = 0x00000004 | msg_tx_ring.phys_buffer[msg_tx_ring.tx_slot]; |
| 331 | |
| 332 | /* Increment enqueue pointer */ |
| 333 | omr = in_be32((void *)&msg_regs->omr); |
| 334 | out_be32((void *)&msg_regs->omr, omr | RIO_MSG_OMR_MUI); |
| 335 | |
| 336 | /* Go to next descriptor */ |
| 337 | if (++msg_tx_ring.tx_slot == msg_tx_ring.size) |
| 338 | msg_tx_ring.tx_slot = 0; |
| 339 | |
| 340 | out: |
| 341 | return ret; |
| 342 | } |
| 343 | |
| 344 | EXPORT_SYMBOL_GPL(rio_hw_add_outb_message); |
| 345 | |
| 346 | /** |
| 347 | * mpc85xx_rio_tx_handler - MPC85xx outbound message interrupt handler |
| 348 | * @irq: Linux interrupt number |
| 349 | * @dev_instance: Pointer to interrupt-specific data |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 350 | * |
| 351 | * Handles outbound message interrupts. Executes a register outbound |
Simon Arlott | a8de5ce | 2007-05-12 05:42:54 +1000 | [diff] [blame] | 352 | * mailbox event handler and acks the interrupt occurrence. |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 353 | */ |
| 354 | static irqreturn_t |
Al Viro | 39e3eb7 | 2006-10-09 12:48:42 +0100 | [diff] [blame] | 355 | mpc85xx_rio_tx_handler(int irq, void *dev_instance) |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 356 | { |
| 357 | int osr; |
| 358 | struct rio_mport *port = (struct rio_mport *)dev_instance; |
| 359 | |
| 360 | osr = in_be32((void *)&msg_regs->osr); |
| 361 | |
| 362 | if (osr & RIO_MSG_OSR_TE) { |
| 363 | pr_info("RIO: outbound message transmission error\n"); |
| 364 | out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_TE); |
| 365 | goto out; |
| 366 | } |
| 367 | |
| 368 | if (osr & RIO_MSG_OSR_QOI) { |
| 369 | pr_info("RIO: outbound message queue overflow\n"); |
| 370 | out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_QOI); |
| 371 | goto out; |
| 372 | } |
| 373 | |
| 374 | if (osr & RIO_MSG_OSR_EOMI) { |
| 375 | u32 dqp = in_be32((void *)&msg_regs->odqdpar); |
| 376 | int slot = (dqp - msg_tx_ring.phys) >> 5; |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 377 | port->outb_msg[0].mcback(port, msg_tx_ring.dev_id, -1, slot); |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 378 | |
| 379 | /* Ack the end-of-message interrupt */ |
| 380 | out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_EOMI); |
| 381 | } |
| 382 | |
| 383 | out: |
| 384 | return IRQ_HANDLED; |
| 385 | } |
| 386 | |
| 387 | /** |
| 388 | * rio_open_outb_mbox - Initialize MPC85xx outbound mailbox |
| 389 | * @mport: Master port implementing the outbound message unit |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 390 | * @dev_id: Device specific pointer to pass on event |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 391 | * @mbox: Mailbox to open |
| 392 | * @entries: Number of entries in the outbound mailbox ring |
| 393 | * |
| 394 | * Initializes buffer ring, request the outbound message interrupt, |
| 395 | * and enables the outbound message unit. Returns %0 on success and |
| 396 | * %-EINVAL or %-ENOMEM on failure. |
| 397 | */ |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 398 | int rio_open_outb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries) |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 399 | { |
| 400 | int i, j, rc = 0; |
| 401 | |
| 402 | if ((entries < RIO_MIN_TX_RING_SIZE) || |
| 403 | (entries > RIO_MAX_TX_RING_SIZE) || (!is_power_of_2(entries))) { |
| 404 | rc = -EINVAL; |
| 405 | goto out; |
| 406 | } |
| 407 | |
| 408 | /* Initialize shadow copy ring */ |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 409 | msg_tx_ring.dev_id = dev_id; |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 410 | msg_tx_ring.size = entries; |
| 411 | |
| 412 | for (i = 0; i < msg_tx_ring.size; i++) { |
| 413 | if (! |
| 414 | (msg_tx_ring.virt_buffer[i] = |
| 415 | dma_alloc_coherent(NULL, RIO_MSG_BUFFER_SIZE, |
| 416 | &msg_tx_ring.phys_buffer[i], |
| 417 | GFP_KERNEL))) { |
| 418 | rc = -ENOMEM; |
| 419 | for (j = 0; j < msg_tx_ring.size; j++) |
| 420 | if (msg_tx_ring.virt_buffer[j]) |
| 421 | dma_free_coherent(NULL, |
| 422 | RIO_MSG_BUFFER_SIZE, |
| 423 | msg_tx_ring. |
| 424 | virt_buffer[j], |
| 425 | msg_tx_ring. |
| 426 | phys_buffer[j]); |
| 427 | goto out; |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | /* Initialize outbound message descriptor ring */ |
| 432 | if (!(msg_tx_ring.virt = dma_alloc_coherent(NULL, |
| 433 | msg_tx_ring.size * |
| 434 | RIO_MSG_DESC_SIZE, |
| 435 | &msg_tx_ring.phys, |
| 436 | GFP_KERNEL))) { |
| 437 | rc = -ENOMEM; |
| 438 | goto out_dma; |
| 439 | } |
| 440 | memset(msg_tx_ring.virt, 0, msg_tx_ring.size * RIO_MSG_DESC_SIZE); |
| 441 | msg_tx_ring.tx_slot = 0; |
| 442 | |
| 443 | /* Point dequeue/enqueue pointers at first entry in ring */ |
| 444 | out_be32((void *)&msg_regs->odqdpar, msg_tx_ring.phys); |
| 445 | out_be32((void *)&msg_regs->odqepar, msg_tx_ring.phys); |
| 446 | |
| 447 | /* Configure for snooping */ |
| 448 | out_be32((void *)&msg_regs->osar, 0x00000004); |
| 449 | |
| 450 | /* Clear interrupt status */ |
| 451 | out_be32((void *)&msg_regs->osr, 0x000000b3); |
| 452 | |
| 453 | /* Hook up outbound message handler */ |
| 454 | if ((rc = |
| 455 | request_irq(MPC85xx_IRQ_RIO_TX, mpc85xx_rio_tx_handler, 0, |
| 456 | "msg_tx", (void *)mport)) < 0) |
| 457 | goto out_irq; |
| 458 | |
| 459 | /* |
| 460 | * Configure outbound message unit |
| 461 | * Snooping |
| 462 | * Interrupts (all enabled, except QEIE) |
| 463 | * Chaining mode |
| 464 | * Disable |
| 465 | */ |
| 466 | out_be32((void *)&msg_regs->omr, 0x00100220); |
| 467 | |
| 468 | /* Set number of entries */ |
| 469 | out_be32((void *)&msg_regs->omr, |
| 470 | in_be32((void *)&msg_regs->omr) | |
| 471 | ((get_bitmask_order(entries) - 2) << 12)); |
| 472 | |
| 473 | /* Now enable the unit */ |
| 474 | out_be32((void *)&msg_regs->omr, in_be32((void *)&msg_regs->omr) | 0x1); |
| 475 | |
| 476 | out: |
| 477 | return rc; |
| 478 | |
| 479 | out_irq: |
| 480 | dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE, |
| 481 | msg_tx_ring.virt, msg_tx_ring.phys); |
| 482 | |
| 483 | out_dma: |
| 484 | for (i = 0; i < msg_tx_ring.size; i++) |
| 485 | dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE, |
| 486 | msg_tx_ring.virt_buffer[i], |
| 487 | msg_tx_ring.phys_buffer[i]); |
| 488 | |
| 489 | return rc; |
| 490 | } |
| 491 | |
| 492 | /** |
| 493 | * rio_close_outb_mbox - Shut down MPC85xx outbound mailbox |
| 494 | * @mport: Master port implementing the outbound message unit |
| 495 | * @mbox: Mailbox to close |
| 496 | * |
| 497 | * Disables the outbound message unit, free all buffers, and |
| 498 | * frees the outbound message interrupt. |
| 499 | */ |
| 500 | void rio_close_outb_mbox(struct rio_mport *mport, int mbox) |
| 501 | { |
| 502 | /* Disable inbound message unit */ |
| 503 | out_be32((void *)&msg_regs->omr, 0); |
| 504 | |
| 505 | /* Free ring */ |
| 506 | dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE, |
| 507 | msg_tx_ring.virt, msg_tx_ring.phys); |
| 508 | |
| 509 | /* Free interrupt */ |
| 510 | free_irq(MPC85xx_IRQ_RIO_TX, (void *)mport); |
| 511 | } |
| 512 | |
| 513 | /** |
| 514 | * mpc85xx_rio_rx_handler - MPC85xx inbound message interrupt handler |
| 515 | * @irq: Linux interrupt number |
| 516 | * @dev_instance: Pointer to interrupt-specific data |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 517 | * |
| 518 | * Handles inbound message interrupts. Executes a registered inbound |
Simon Arlott | a8de5ce | 2007-05-12 05:42:54 +1000 | [diff] [blame] | 519 | * mailbox event handler and acks the interrupt occurrence. |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 520 | */ |
| 521 | static irqreturn_t |
Al Viro | 39e3eb7 | 2006-10-09 12:48:42 +0100 | [diff] [blame] | 522 | mpc85xx_rio_rx_handler(int irq, void *dev_instance) |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 523 | { |
| 524 | int isr; |
| 525 | struct rio_mport *port = (struct rio_mport *)dev_instance; |
| 526 | |
| 527 | isr = in_be32((void *)&msg_regs->isr); |
| 528 | |
| 529 | if (isr & RIO_MSG_ISR_TE) { |
| 530 | pr_info("RIO: inbound message reception error\n"); |
| 531 | out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_TE); |
| 532 | goto out; |
| 533 | } |
| 534 | |
| 535 | /* XXX Need to check/dispatch until queue empty */ |
| 536 | if (isr & RIO_MSG_ISR_DIQI) { |
| 537 | /* |
| 538 | * We implement *only* mailbox 0, but can receive messages |
| 539 | * for any mailbox/letter to that mailbox destination. So, |
| 540 | * make the callback with an unknown/invalid mailbox number |
| 541 | * argument. |
| 542 | */ |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 543 | port->inb_msg[0].mcback(port, msg_rx_ring.dev_id, -1, -1); |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 544 | |
| 545 | /* Ack the queueing interrupt */ |
| 546 | out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_DIQI); |
| 547 | } |
| 548 | |
| 549 | out: |
| 550 | return IRQ_HANDLED; |
| 551 | } |
| 552 | |
| 553 | /** |
| 554 | * rio_open_inb_mbox - Initialize MPC85xx inbound mailbox |
| 555 | * @mport: Master port implementing the inbound message unit |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 556 | * @dev_id: Device specific pointer to pass on event |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 557 | * @mbox: Mailbox to open |
| 558 | * @entries: Number of entries in the inbound mailbox ring |
| 559 | * |
| 560 | * Initializes buffer ring, request the inbound message interrupt, |
| 561 | * and enables the inbound message unit. Returns %0 on success |
| 562 | * and %-EINVAL or %-ENOMEM on failure. |
| 563 | */ |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 564 | int rio_open_inb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries) |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 565 | { |
| 566 | int i, rc = 0; |
| 567 | |
| 568 | if ((entries < RIO_MIN_RX_RING_SIZE) || |
| 569 | (entries > RIO_MAX_RX_RING_SIZE) || (!is_power_of_2(entries))) { |
| 570 | rc = -EINVAL; |
| 571 | goto out; |
| 572 | } |
| 573 | |
| 574 | /* Initialize client buffer ring */ |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 575 | msg_rx_ring.dev_id = dev_id; |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 576 | msg_rx_ring.size = entries; |
| 577 | msg_rx_ring.rx_slot = 0; |
| 578 | for (i = 0; i < msg_rx_ring.size; i++) |
| 579 | msg_rx_ring.virt_buffer[i] = NULL; |
| 580 | |
| 581 | /* Initialize inbound message ring */ |
| 582 | if (!(msg_rx_ring.virt = dma_alloc_coherent(NULL, |
| 583 | msg_rx_ring.size * |
| 584 | RIO_MAX_MSG_SIZE, |
| 585 | &msg_rx_ring.phys, |
| 586 | GFP_KERNEL))) { |
| 587 | rc = -ENOMEM; |
| 588 | goto out; |
| 589 | } |
| 590 | |
| 591 | /* Point dequeue/enqueue pointers at first entry in ring */ |
| 592 | out_be32((void *)&msg_regs->ifqdpar, (u32) msg_rx_ring.phys); |
| 593 | out_be32((void *)&msg_regs->ifqepar, (u32) msg_rx_ring.phys); |
| 594 | |
| 595 | /* Clear interrupt status */ |
| 596 | out_be32((void *)&msg_regs->isr, 0x00000091); |
| 597 | |
| 598 | /* Hook up inbound message handler */ |
| 599 | if ((rc = |
| 600 | request_irq(MPC85xx_IRQ_RIO_RX, mpc85xx_rio_rx_handler, 0, |
| 601 | "msg_rx", (void *)mport)) < 0) { |
| 602 | dma_free_coherent(NULL, RIO_MSG_BUFFER_SIZE, |
| 603 | msg_tx_ring.virt_buffer[i], |
| 604 | msg_tx_ring.phys_buffer[i]); |
| 605 | goto out; |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * Configure inbound message unit: |
| 610 | * Snooping |
| 611 | * 4KB max message size |
| 612 | * Unmask all interrupt sources |
| 613 | * Disable |
| 614 | */ |
| 615 | out_be32((void *)&msg_regs->imr, 0x001b0060); |
| 616 | |
| 617 | /* Set number of queue entries */ |
| 618 | out_be32((void *)&msg_regs->imr, |
| 619 | in_be32((void *)&msg_regs->imr) | |
| 620 | ((get_bitmask_order(entries) - 2) << 12)); |
| 621 | |
| 622 | /* Now enable the unit */ |
| 623 | out_be32((void *)&msg_regs->imr, in_be32((void *)&msg_regs->imr) | 0x1); |
| 624 | |
| 625 | out: |
| 626 | return rc; |
| 627 | } |
| 628 | |
| 629 | /** |
| 630 | * rio_close_inb_mbox - Shut down MPC85xx inbound mailbox |
| 631 | * @mport: Master port implementing the inbound message unit |
| 632 | * @mbox: Mailbox to close |
| 633 | * |
| 634 | * Disables the inbound message unit, free all buffers, and |
| 635 | * frees the inbound message interrupt. |
| 636 | */ |
| 637 | void rio_close_inb_mbox(struct rio_mport *mport, int mbox) |
| 638 | { |
| 639 | /* Disable inbound message unit */ |
| 640 | out_be32((void *)&msg_regs->imr, 0); |
| 641 | |
| 642 | /* Free ring */ |
| 643 | dma_free_coherent(NULL, msg_rx_ring.size * RIO_MAX_MSG_SIZE, |
| 644 | msg_rx_ring.virt, msg_rx_ring.phys); |
| 645 | |
| 646 | /* Free interrupt */ |
| 647 | free_irq(MPC85xx_IRQ_RIO_RX, (void *)mport); |
| 648 | } |
| 649 | |
| 650 | /** |
| 651 | * rio_hw_add_inb_buffer - Add buffer to the MPC85xx inbound message queue |
| 652 | * @mport: Master port implementing the inbound message unit |
| 653 | * @mbox: Inbound mailbox number |
| 654 | * @buf: Buffer to add to inbound queue |
| 655 | * |
| 656 | * Adds the @buf buffer to the MPC85xx inbound message queue. Returns |
| 657 | * %0 on success or %-EINVAL on failure. |
| 658 | */ |
| 659 | int rio_hw_add_inb_buffer(struct rio_mport *mport, int mbox, void *buf) |
| 660 | { |
| 661 | int rc = 0; |
| 662 | |
| 663 | pr_debug("RIO: rio_hw_add_inb_buffer(), msg_rx_ring.rx_slot %d\n", |
| 664 | msg_rx_ring.rx_slot); |
| 665 | |
| 666 | if (msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot]) { |
| 667 | printk(KERN_ERR |
| 668 | "RIO: error adding inbound buffer %d, buffer exists\n", |
| 669 | msg_rx_ring.rx_slot); |
| 670 | rc = -EINVAL; |
| 671 | goto out; |
| 672 | } |
| 673 | |
| 674 | msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot] = buf; |
| 675 | if (++msg_rx_ring.rx_slot == msg_rx_ring.size) |
| 676 | msg_rx_ring.rx_slot = 0; |
| 677 | |
| 678 | out: |
| 679 | return rc; |
| 680 | } |
| 681 | |
| 682 | EXPORT_SYMBOL_GPL(rio_hw_add_inb_buffer); |
| 683 | |
| 684 | /** |
| 685 | * rio_hw_get_inb_message - Fetch inbound message from the MPC85xx message unit |
| 686 | * @mport: Master port implementing the inbound message unit |
| 687 | * @mbox: Inbound mailbox number |
| 688 | * |
| 689 | * Gets the next available inbound message from the inbound message queue. |
| 690 | * A pointer to the message is returned on success or NULL on failure. |
| 691 | */ |
| 692 | void *rio_hw_get_inb_message(struct rio_mport *mport, int mbox) |
| 693 | { |
| 694 | u32 imr; |
| 695 | u32 phys_buf, virt_buf; |
| 696 | void *buf = NULL; |
| 697 | int buf_idx; |
| 698 | |
| 699 | phys_buf = in_be32((void *)&msg_regs->ifqdpar); |
| 700 | |
| 701 | /* If no more messages, then bail out */ |
| 702 | if (phys_buf == in_be32((void *)&msg_regs->ifqepar)) |
| 703 | goto out2; |
| 704 | |
| 705 | virt_buf = (u32) msg_rx_ring.virt + (phys_buf - msg_rx_ring.phys); |
| 706 | buf_idx = (phys_buf - msg_rx_ring.phys) / RIO_MAX_MSG_SIZE; |
| 707 | buf = msg_rx_ring.virt_buffer[buf_idx]; |
| 708 | |
| 709 | if (!buf) { |
| 710 | printk(KERN_ERR |
| 711 | "RIO: inbound message copy failed, no buffers\n"); |
| 712 | goto out1; |
| 713 | } |
| 714 | |
| 715 | /* Copy max message size, caller is expected to allocate that big */ |
| 716 | memcpy(buf, (void *)virt_buf, RIO_MAX_MSG_SIZE); |
| 717 | |
| 718 | /* Clear the available buffer */ |
| 719 | msg_rx_ring.virt_buffer[buf_idx] = NULL; |
| 720 | |
| 721 | out1: |
| 722 | imr = in_be32((void *)&msg_regs->imr); |
| 723 | out_be32((void *)&msg_regs->imr, imr | RIO_MSG_IMR_MI); |
| 724 | |
| 725 | out2: |
| 726 | return buf; |
| 727 | } |
| 728 | |
| 729 | EXPORT_SYMBOL_GPL(rio_hw_get_inb_message); |
| 730 | |
| 731 | /** |
| 732 | * mpc85xx_rio_dbell_handler - MPC85xx doorbell interrupt handler |
| 733 | * @irq: Linux interrupt number |
| 734 | * @dev_instance: Pointer to interrupt-specific data |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 735 | * |
| 736 | * Handles doorbell interrupts. Parses a list of registered |
| 737 | * doorbell event handlers and executes a matching event handler. |
| 738 | */ |
| 739 | static irqreturn_t |
Al Viro | 39e3eb7 | 2006-10-09 12:48:42 +0100 | [diff] [blame] | 740 | mpc85xx_rio_dbell_handler(int irq, void *dev_instance) |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 741 | { |
| 742 | int dsr; |
| 743 | struct rio_mport *port = (struct rio_mport *)dev_instance; |
| 744 | |
| 745 | dsr = in_be32((void *)&msg_regs->dsr); |
| 746 | |
| 747 | if (dsr & DOORBELL_DSR_TE) { |
| 748 | pr_info("RIO: doorbell reception error\n"); |
| 749 | out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_TE); |
| 750 | goto out; |
| 751 | } |
| 752 | |
| 753 | if (dsr & DOORBELL_DSR_QFI) { |
| 754 | pr_info("RIO: doorbell queue full\n"); |
| 755 | out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_QFI); |
| 756 | goto out; |
| 757 | } |
| 758 | |
| 759 | /* XXX Need to check/dispatch until queue empty */ |
| 760 | if (dsr & DOORBELL_DSR_DIQI) { |
| 761 | u32 dmsg = |
| 762 | (u32) dbell_ring.virt + |
| 763 | (in_be32((void *)&msg_regs->dqdpar) & 0xfff); |
| 764 | u32 dmr; |
| 765 | struct rio_dbell *dbell; |
| 766 | int found = 0; |
| 767 | |
| 768 | pr_debug |
| 769 | ("RIO: processing doorbell, sid %2.2x tid %2.2x info %4.4x\n", |
| 770 | DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg)); |
| 771 | |
| 772 | list_for_each_entry(dbell, &port->dbells, node) { |
| 773 | if ((dbell->res->start <= DBELL_INF(dmsg)) && |
| 774 | (dbell->res->end >= DBELL_INF(dmsg))) { |
| 775 | found = 1; |
| 776 | break; |
| 777 | } |
| 778 | } |
| 779 | if (found) { |
Matt Porter | 6978bbc | 2005-11-07 01:00:20 -0800 | [diff] [blame] | 780 | dbell->dinb(port, dbell->dev_id, DBELL_SID(dmsg), DBELL_TID(dmsg), |
Matt Porter | 2b0c28d7f | 2005-11-07 01:00:19 -0800 | [diff] [blame] | 781 | DBELL_INF(dmsg)); |
| 782 | } else { |
| 783 | pr_debug |
| 784 | ("RIO: spurious doorbell, sid %2.2x tid %2.2x info %4.4x\n", |
| 785 | DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg)); |
| 786 | } |
| 787 | dmr = in_be32((void *)&msg_regs->dmr); |
| 788 | out_be32((void *)&msg_regs->dmr, dmr | DOORBELL_DMR_DI); |
| 789 | out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_DIQI); |
| 790 | } |
| 791 | |
| 792 | out: |
| 793 | return IRQ_HANDLED; |
| 794 | } |
| 795 | |
| 796 | /** |
| 797 | * mpc85xx_rio_doorbell_init - MPC85xx doorbell interface init |
| 798 | * @mport: Master port implementing the inbound doorbell unit |
| 799 | * |
| 800 | * Initializes doorbell unit hardware and inbound DMA buffer |
| 801 | * ring. Called from mpc85xx_rio_setup(). Returns %0 on success |
| 802 | * or %-ENOMEM on failure. |
| 803 | */ |
| 804 | static int mpc85xx_rio_doorbell_init(struct rio_mport *mport) |
| 805 | { |
| 806 | int rc = 0; |
| 807 | |
| 808 | /* Map outbound doorbell window immediately after maintenance window */ |
| 809 | if (!(dbell_win = |
| 810 | (u32) ioremap(mport->iores.start + RIO_MAINT_WIN_SIZE, |
| 811 | RIO_DBELL_WIN_SIZE))) { |
| 812 | printk(KERN_ERR |
| 813 | "RIO: unable to map outbound doorbell window\n"); |
| 814 | rc = -ENOMEM; |
| 815 | goto out; |
| 816 | } |
| 817 | |
| 818 | /* Initialize inbound doorbells */ |
| 819 | if (!(dbell_ring.virt = dma_alloc_coherent(NULL, |
| 820 | 512 * DOORBELL_MESSAGE_SIZE, |
| 821 | &dbell_ring.phys, |
| 822 | GFP_KERNEL))) { |
| 823 | printk(KERN_ERR "RIO: unable allocate inbound doorbell ring\n"); |
| 824 | rc = -ENOMEM; |
| 825 | iounmap((void *)dbell_win); |
| 826 | goto out; |
| 827 | } |
| 828 | |
| 829 | /* Point dequeue/enqueue pointers at first entry in ring */ |
| 830 | out_be32((void *)&msg_regs->dqdpar, (u32) dbell_ring.phys); |
| 831 | out_be32((void *)&msg_regs->dqepar, (u32) dbell_ring.phys); |
| 832 | |
| 833 | /* Clear interrupt status */ |
| 834 | out_be32((void *)&msg_regs->dsr, 0x00000091); |
| 835 | |
| 836 | /* Hook up doorbell handler */ |
| 837 | if ((rc = |
| 838 | request_irq(MPC85xx_IRQ_RIO_BELL, mpc85xx_rio_dbell_handler, 0, |
| 839 | "dbell_rx", (void *)mport) < 0)) { |
| 840 | iounmap((void *)dbell_win); |
| 841 | dma_free_coherent(NULL, 512 * DOORBELL_MESSAGE_SIZE, |
| 842 | dbell_ring.virt, dbell_ring.phys); |
| 843 | printk(KERN_ERR |
| 844 | "MPC85xx RIO: unable to request inbound doorbell irq"); |
| 845 | goto out; |
| 846 | } |
| 847 | |
| 848 | /* Configure doorbells for snooping, 512 entries, and enable */ |
| 849 | out_be32((void *)&msg_regs->dmr, 0x00108161); |
| 850 | |
| 851 | out: |
| 852 | return rc; |
| 853 | } |
| 854 | |
| 855 | static char *cmdline = NULL; |
| 856 | |
| 857 | static int mpc85xx_rio_get_hdid(int index) |
| 858 | { |
| 859 | /* XXX Need to parse multiple entries in some format */ |
| 860 | if (!cmdline) |
| 861 | return -1; |
| 862 | |
| 863 | return simple_strtol(cmdline, NULL, 0); |
| 864 | } |
| 865 | |
| 866 | static int mpc85xx_rio_get_cmdline(char *s) |
| 867 | { |
| 868 | if (!s) |
| 869 | return 0; |
| 870 | |
| 871 | cmdline = s; |
| 872 | return 1; |
| 873 | } |
| 874 | |
| 875 | __setup("riohdid=", mpc85xx_rio_get_cmdline); |
| 876 | |
| 877 | /** |
| 878 | * mpc85xx_rio_setup - Setup MPC85xx RapidIO interface |
| 879 | * @law_start: Starting physical address of RapidIO LAW |
| 880 | * @law_size: Size of RapidIO LAW |
| 881 | * |
| 882 | * Initializes MPC85xx RapidIO hardware interface, configures |
| 883 | * master port with system-specific info, and registers the |
| 884 | * master port with the RapidIO subsystem. |
| 885 | */ |
| 886 | void mpc85xx_rio_setup(int law_start, int law_size) |
| 887 | { |
| 888 | struct rio_ops *ops; |
| 889 | struct rio_mport *port; |
| 890 | |
| 891 | ops = kmalloc(sizeof(struct rio_ops), GFP_KERNEL); |
| 892 | ops->lcread = mpc85xx_local_config_read; |
| 893 | ops->lcwrite = mpc85xx_local_config_write; |
| 894 | ops->cread = mpc85xx_rio_config_read; |
| 895 | ops->cwrite = mpc85xx_rio_config_write; |
| 896 | ops->dsend = mpc85xx_rio_doorbell_send; |
| 897 | |
| 898 | port = kmalloc(sizeof(struct rio_mport), GFP_KERNEL); |
| 899 | port->id = 0; |
| 900 | port->index = 0; |
| 901 | INIT_LIST_HEAD(&port->dbells); |
| 902 | port->iores.start = law_start; |
| 903 | port->iores.end = law_start + law_size; |
| 904 | port->iores.flags = IORESOURCE_MEM; |
| 905 | |
| 906 | rio_init_dbell_res(&port->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff); |
| 907 | rio_init_mbox_res(&port->riores[RIO_INB_MBOX_RESOURCE], 0, 0); |
| 908 | rio_init_mbox_res(&port->riores[RIO_OUTB_MBOX_RESOURCE], 0, 0); |
| 909 | strcpy(port->name, "RIO0 mport"); |
| 910 | |
| 911 | port->ops = ops; |
| 912 | port->host_deviceid = mpc85xx_rio_get_hdid(port->id); |
| 913 | |
| 914 | rio_register_mport(port); |
| 915 | |
| 916 | regs_win = (u32) ioremap(RIO_REGS_BASE, 0x20000); |
| 917 | atmu_regs = (struct rio_atmu_regs *)(regs_win + RIO_ATMU_REGS_OFFSET); |
| 918 | maint_atmu_regs = atmu_regs + 1; |
| 919 | dbell_atmu_regs = atmu_regs + 2; |
| 920 | msg_regs = (struct rio_msg_regs *)(regs_win + RIO_MSG_REGS_OFFSET); |
| 921 | |
| 922 | /* Configure maintenance transaction window */ |
| 923 | out_be32((void *)&maint_atmu_regs->rowbar, 0x000c0000); |
| 924 | out_be32((void *)&maint_atmu_regs->rowar, 0x80077015); |
| 925 | |
| 926 | maint_win = (u32) ioremap(law_start, RIO_MAINT_WIN_SIZE); |
| 927 | |
| 928 | /* Configure outbound doorbell window */ |
| 929 | out_be32((void *)&dbell_atmu_regs->rowbar, 0x000c0400); |
| 930 | out_be32((void *)&dbell_atmu_regs->rowar, 0x8004200b); |
| 931 | mpc85xx_rio_doorbell_init(port); |
| 932 | } |