Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006-2007 PA Semi, Inc |
| 3 | * |
| 4 | * Common functions for DMA access on PA Semi PWRficient |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
Olof Johansson | afea327 | 2008-03-05 12:11:48 -0600 | [diff] [blame] | 20 | #include <linux/kernel.h> |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 21 | #include <linux/init.h> |
Paul Gortmaker | 4b16f8e | 2011-07-22 18:24:23 -0400 | [diff] [blame] | 22 | #include <linux/export.h> |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 23 | #include <linux/pci.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 25 | #include <linux/of.h> |
Paul Gortmaker | 62fe91b | 2011-05-27 14:25:11 -0400 | [diff] [blame] | 26 | #include <linux/sched.h> |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 27 | |
| 28 | #include <asm/pasemi_dma.h> |
| 29 | |
| 30 | #define MAX_TXCH 64 |
| 31 | #define MAX_RXCH 64 |
Olof Johansson | f37203b | 2008-03-05 12:25:45 -0600 | [diff] [blame] | 32 | #define MAX_FLAGS 64 |
Olof Johansson | dda56df | 2008-03-05 12:25:59 -0600 | [diff] [blame] | 33 | #define MAX_FUN 8 |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 34 | |
| 35 | static struct pasdma_status *dma_status; |
| 36 | |
| 37 | static void __iomem *iob_regs; |
| 38 | static void __iomem *mac_regs[6]; |
| 39 | static void __iomem *dma_regs; |
| 40 | |
| 41 | static int base_hw_irq; |
| 42 | |
| 43 | static int num_txch, num_rxch; |
| 44 | |
| 45 | static struct pci_dev *dma_pdev; |
| 46 | |
| 47 | /* Bitmaps to handle allocation of channels */ |
| 48 | |
| 49 | static DECLARE_BITMAP(txch_free, MAX_TXCH); |
| 50 | static DECLARE_BITMAP(rxch_free, MAX_RXCH); |
Olof Johansson | f37203b | 2008-03-05 12:25:45 -0600 | [diff] [blame] | 51 | static DECLARE_BITMAP(flags_free, MAX_FLAGS); |
Olof Johansson | dda56df | 2008-03-05 12:25:59 -0600 | [diff] [blame] | 52 | static DECLARE_BITMAP(fun_free, MAX_FUN); |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 53 | |
| 54 | /* pasemi_read_iob_reg - read IOB register |
| 55 | * @reg: Register to read (offset into PCI CFG space) |
| 56 | */ |
| 57 | unsigned int pasemi_read_iob_reg(unsigned int reg) |
| 58 | { |
| 59 | return in_le32(iob_regs+reg); |
| 60 | } |
| 61 | EXPORT_SYMBOL(pasemi_read_iob_reg); |
| 62 | |
| 63 | /* pasemi_write_iob_reg - write IOB register |
| 64 | * @reg: Register to write to (offset into PCI CFG space) |
| 65 | * @val: Value to write |
| 66 | */ |
| 67 | void pasemi_write_iob_reg(unsigned int reg, unsigned int val) |
| 68 | { |
| 69 | out_le32(iob_regs+reg, val); |
| 70 | } |
| 71 | EXPORT_SYMBOL(pasemi_write_iob_reg); |
| 72 | |
| 73 | /* pasemi_read_mac_reg - read MAC register |
| 74 | * @intf: MAC interface |
| 75 | * @reg: Register to read (offset into PCI CFG space) |
| 76 | */ |
| 77 | unsigned int pasemi_read_mac_reg(int intf, unsigned int reg) |
| 78 | { |
| 79 | return in_le32(mac_regs[intf]+reg); |
| 80 | } |
| 81 | EXPORT_SYMBOL(pasemi_read_mac_reg); |
| 82 | |
| 83 | /* pasemi_write_mac_reg - write MAC register |
| 84 | * @intf: MAC interface |
| 85 | * @reg: Register to write to (offset into PCI CFG space) |
| 86 | * @val: Value to write |
| 87 | */ |
| 88 | void pasemi_write_mac_reg(int intf, unsigned int reg, unsigned int val) |
| 89 | { |
| 90 | out_le32(mac_regs[intf]+reg, val); |
| 91 | } |
| 92 | EXPORT_SYMBOL(pasemi_write_mac_reg); |
| 93 | |
| 94 | /* pasemi_read_dma_reg - read DMA register |
| 95 | * @reg: Register to read (offset into PCI CFG space) |
| 96 | */ |
| 97 | unsigned int pasemi_read_dma_reg(unsigned int reg) |
| 98 | { |
| 99 | return in_le32(dma_regs+reg); |
| 100 | } |
| 101 | EXPORT_SYMBOL(pasemi_read_dma_reg); |
| 102 | |
| 103 | /* pasemi_write_dma_reg - write DMA register |
| 104 | * @reg: Register to write to (offset into PCI CFG space) |
| 105 | * @val: Value to write |
| 106 | */ |
| 107 | void pasemi_write_dma_reg(unsigned int reg, unsigned int val) |
| 108 | { |
| 109 | out_le32(dma_regs+reg, val); |
| 110 | } |
| 111 | EXPORT_SYMBOL(pasemi_write_dma_reg); |
| 112 | |
| 113 | static int pasemi_alloc_tx_chan(enum pasemi_dmachan_type type) |
| 114 | { |
| 115 | int bit; |
| 116 | int start, limit; |
| 117 | |
| 118 | switch (type & (TXCHAN_EVT0|TXCHAN_EVT1)) { |
| 119 | case TXCHAN_EVT0: |
| 120 | start = 0; |
| 121 | limit = 10; |
| 122 | break; |
| 123 | case TXCHAN_EVT1: |
| 124 | start = 10; |
| 125 | limit = MAX_TXCH; |
| 126 | break; |
| 127 | default: |
| 128 | start = 0; |
| 129 | limit = MAX_TXCH; |
| 130 | break; |
| 131 | } |
| 132 | retry: |
| 133 | bit = find_next_bit(txch_free, MAX_TXCH, start); |
| 134 | if (bit >= limit) |
| 135 | return -ENOSPC; |
| 136 | if (!test_and_clear_bit(bit, txch_free)) |
| 137 | goto retry; |
| 138 | |
| 139 | return bit; |
| 140 | } |
| 141 | |
| 142 | static void pasemi_free_tx_chan(int chan) |
| 143 | { |
| 144 | BUG_ON(test_bit(chan, txch_free)); |
| 145 | set_bit(chan, txch_free); |
| 146 | } |
| 147 | |
| 148 | static int pasemi_alloc_rx_chan(void) |
| 149 | { |
| 150 | int bit; |
| 151 | retry: |
| 152 | bit = find_first_bit(rxch_free, MAX_RXCH); |
| 153 | if (bit >= MAX_TXCH) |
| 154 | return -ENOSPC; |
| 155 | if (!test_and_clear_bit(bit, rxch_free)) |
| 156 | goto retry; |
| 157 | |
| 158 | return bit; |
| 159 | } |
| 160 | |
| 161 | static void pasemi_free_rx_chan(int chan) |
| 162 | { |
| 163 | BUG_ON(test_bit(chan, rxch_free)); |
| 164 | set_bit(chan, rxch_free); |
| 165 | } |
| 166 | |
| 167 | /* pasemi_dma_alloc_chan - Allocate a DMA channel |
| 168 | * @type: Type of channel to allocate |
| 169 | * @total_size: Total size of structure to allocate (to allow for more |
| 170 | * room behind the structure to be used by the client) |
| 171 | * @offset: Offset in bytes from start of the total structure to the beginning |
| 172 | * of struct pasemi_dmachan. Needed when struct pasemi_dmachan is |
| 173 | * not the first member of the client structure. |
| 174 | * |
| 175 | * pasemi_dma_alloc_chan allocates a DMA channel for use by a client. The |
| 176 | * type argument specifies whether it's a RX or TX channel, and in the case |
| 177 | * of TX channels which group it needs to belong to (if any). |
| 178 | * |
| 179 | * Returns a pointer to the total structure allocated on success, NULL |
| 180 | * on failure. |
| 181 | */ |
| 182 | void *pasemi_dma_alloc_chan(enum pasemi_dmachan_type type, |
| 183 | int total_size, int offset) |
| 184 | { |
| 185 | void *buf; |
| 186 | struct pasemi_dmachan *chan; |
| 187 | int chno; |
| 188 | |
| 189 | BUG_ON(total_size < sizeof(struct pasemi_dmachan)); |
| 190 | |
| 191 | buf = kzalloc(total_size, GFP_KERNEL); |
| 192 | |
| 193 | if (!buf) |
| 194 | return NULL; |
| 195 | chan = buf + offset; |
| 196 | |
| 197 | chan->priv = buf; |
| 198 | |
| 199 | switch (type & (TXCHAN|RXCHAN)) { |
| 200 | case RXCHAN: |
| 201 | chno = pasemi_alloc_rx_chan(); |
| 202 | chan->chno = chno; |
| 203 | chan->irq = irq_create_mapping(NULL, |
| 204 | base_hw_irq + num_txch + chno); |
| 205 | chan->status = &dma_status->rx_sta[chno]; |
| 206 | break; |
| 207 | case TXCHAN: |
| 208 | chno = pasemi_alloc_tx_chan(type); |
| 209 | chan->chno = chno; |
| 210 | chan->irq = irq_create_mapping(NULL, base_hw_irq + chno); |
| 211 | chan->status = &dma_status->tx_sta[chno]; |
| 212 | break; |
| 213 | } |
| 214 | |
| 215 | chan->chan_type = type; |
| 216 | |
| 217 | return chan; |
| 218 | } |
| 219 | EXPORT_SYMBOL(pasemi_dma_alloc_chan); |
| 220 | |
| 221 | /* pasemi_dma_free_chan - Free a previously allocated channel |
| 222 | * @chan: Channel to free |
| 223 | * |
| 224 | * Frees a previously allocated channel. It will also deallocate any |
| 225 | * descriptor ring associated with the channel, if allocated. |
| 226 | */ |
| 227 | void pasemi_dma_free_chan(struct pasemi_dmachan *chan) |
| 228 | { |
| 229 | if (chan->ring_virt) |
| 230 | pasemi_dma_free_ring(chan); |
| 231 | |
| 232 | switch (chan->chan_type & (RXCHAN|TXCHAN)) { |
| 233 | case RXCHAN: |
| 234 | pasemi_free_rx_chan(chan->chno); |
| 235 | break; |
| 236 | case TXCHAN: |
| 237 | pasemi_free_tx_chan(chan->chno); |
| 238 | break; |
| 239 | } |
| 240 | |
| 241 | kfree(chan->priv); |
| 242 | } |
| 243 | EXPORT_SYMBOL(pasemi_dma_free_chan); |
| 244 | |
| 245 | /* pasemi_dma_alloc_ring - Allocate descriptor ring for a channel |
| 246 | * @chan: Channel for which to allocate |
| 247 | * @ring_size: Ring size in 64-bit (8-byte) words |
| 248 | * |
| 249 | * Allocate a descriptor ring for a channel. Returns 0 on success, errno |
| 250 | * on failure. The passed in struct pasemi_dmachan is updated with the |
| 251 | * virtual and DMA addresses of the ring. |
| 252 | */ |
| 253 | int pasemi_dma_alloc_ring(struct pasemi_dmachan *chan, int ring_size) |
| 254 | { |
| 255 | BUG_ON(chan->ring_virt); |
| 256 | |
| 257 | chan->ring_size = ring_size; |
| 258 | |
| 259 | chan->ring_virt = dma_alloc_coherent(&dma_pdev->dev, |
| 260 | ring_size * sizeof(u64), |
| 261 | &chan->ring_dma, GFP_KERNEL); |
| 262 | |
| 263 | if (!chan->ring_virt) |
| 264 | return -ENOMEM; |
| 265 | |
| 266 | memset(chan->ring_virt, 0, ring_size * sizeof(u64)); |
| 267 | |
| 268 | return 0; |
| 269 | } |
| 270 | EXPORT_SYMBOL(pasemi_dma_alloc_ring); |
| 271 | |
| 272 | /* pasemi_dma_free_ring - Free an allocated descriptor ring for a channel |
| 273 | * @chan: Channel for which to free the descriptor ring |
| 274 | * |
| 275 | * Frees a previously allocated descriptor ring for a channel. |
| 276 | */ |
| 277 | void pasemi_dma_free_ring(struct pasemi_dmachan *chan) |
| 278 | { |
| 279 | BUG_ON(!chan->ring_virt); |
| 280 | |
| 281 | dma_free_coherent(&dma_pdev->dev, chan->ring_size * sizeof(u64), |
| 282 | chan->ring_virt, chan->ring_dma); |
| 283 | chan->ring_virt = NULL; |
| 284 | chan->ring_size = 0; |
| 285 | chan->ring_dma = 0; |
| 286 | } |
| 287 | EXPORT_SYMBOL(pasemi_dma_free_ring); |
| 288 | |
| 289 | /* pasemi_dma_start_chan - Start a DMA channel |
| 290 | * @chan: Channel to start |
| 291 | * @cmdsta: Additional CCMDSTA/TCMDSTA bits to write |
| 292 | * |
| 293 | * Enables (starts) a DMA channel with optional additional arguments. |
| 294 | */ |
| 295 | void pasemi_dma_start_chan(const struct pasemi_dmachan *chan, const u32 cmdsta) |
| 296 | { |
| 297 | if (chan->chan_type == RXCHAN) |
| 298 | pasemi_write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno), |
| 299 | cmdsta | PAS_DMA_RXCHAN_CCMDSTA_EN); |
| 300 | else |
| 301 | pasemi_write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno), |
| 302 | cmdsta | PAS_DMA_TXCHAN_TCMDSTA_EN); |
| 303 | } |
| 304 | EXPORT_SYMBOL(pasemi_dma_start_chan); |
| 305 | |
| 306 | /* pasemi_dma_stop_chan - Stop a DMA channel |
| 307 | * @chan: Channel to stop |
| 308 | * |
| 309 | * Stops (disables) a DMA channel. This is done by setting the ST bit in the |
| 310 | * CMDSTA register and waiting on the ACT (active) bit to clear, then |
| 311 | * finally disabling the whole channel. |
| 312 | * |
| 313 | * This function will only try for a short while for the channel to stop, if |
| 314 | * it doesn't it will return failure. |
| 315 | * |
| 316 | * Returns 1 on success, 0 on failure. |
| 317 | */ |
| 318 | #define MAX_RETRIES 5000 |
| 319 | int pasemi_dma_stop_chan(const struct pasemi_dmachan *chan) |
| 320 | { |
| 321 | int reg, retries; |
| 322 | u32 sta; |
| 323 | |
| 324 | if (chan->chan_type == RXCHAN) { |
| 325 | reg = PAS_DMA_RXCHAN_CCMDSTA(chan->chno); |
| 326 | pasemi_write_dma_reg(reg, PAS_DMA_RXCHAN_CCMDSTA_ST); |
| 327 | for (retries = 0; retries < MAX_RETRIES; retries++) { |
| 328 | sta = pasemi_read_dma_reg(reg); |
| 329 | if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)) { |
| 330 | pasemi_write_dma_reg(reg, 0); |
| 331 | return 1; |
| 332 | } |
| 333 | cond_resched(); |
| 334 | } |
| 335 | } else { |
| 336 | reg = PAS_DMA_TXCHAN_TCMDSTA(chan->chno); |
| 337 | pasemi_write_dma_reg(reg, PAS_DMA_TXCHAN_TCMDSTA_ST); |
| 338 | for (retries = 0; retries < MAX_RETRIES; retries++) { |
| 339 | sta = pasemi_read_dma_reg(reg); |
| 340 | if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)) { |
| 341 | pasemi_write_dma_reg(reg, 0); |
| 342 | return 1; |
| 343 | } |
| 344 | cond_resched(); |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | return 0; |
| 349 | } |
| 350 | EXPORT_SYMBOL(pasemi_dma_stop_chan); |
| 351 | |
| 352 | /* pasemi_dma_alloc_buf - Allocate a buffer to use for DMA |
| 353 | * @chan: Channel to allocate for |
| 354 | * @size: Size of buffer in bytes |
| 355 | * @handle: DMA handle |
| 356 | * |
| 357 | * Allocate a buffer to be used by the DMA engine for read/write, |
| 358 | * similar to dma_alloc_coherent(). |
| 359 | * |
| 360 | * Returns the virtual address of the buffer, or NULL in case of failure. |
| 361 | */ |
| 362 | void *pasemi_dma_alloc_buf(struct pasemi_dmachan *chan, int size, |
| 363 | dma_addr_t *handle) |
| 364 | { |
| 365 | return dma_alloc_coherent(&dma_pdev->dev, size, handle, GFP_KERNEL); |
| 366 | } |
| 367 | EXPORT_SYMBOL(pasemi_dma_alloc_buf); |
| 368 | |
| 369 | /* pasemi_dma_free_buf - Free a buffer used for DMA |
| 370 | * @chan: Channel the buffer was allocated for |
| 371 | * @size: Size of buffer in bytes |
| 372 | * @handle: DMA handle |
| 373 | * |
| 374 | * Frees a previously allocated buffer. |
| 375 | */ |
| 376 | void pasemi_dma_free_buf(struct pasemi_dmachan *chan, int size, |
| 377 | dma_addr_t *handle) |
| 378 | { |
| 379 | dma_free_coherent(&dma_pdev->dev, size, handle, GFP_KERNEL); |
| 380 | } |
| 381 | EXPORT_SYMBOL(pasemi_dma_free_buf); |
| 382 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 383 | /* pasemi_dma_alloc_flag - Allocate a flag (event) for channel synchronization |
Olof Johansson | f37203b | 2008-03-05 12:25:45 -0600 | [diff] [blame] | 384 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 385 | * Allocates a flag for use with channel synchronization (event descriptors). |
Olof Johansson | f37203b | 2008-03-05 12:25:45 -0600 | [diff] [blame] | 386 | * Returns allocated flag (0-63), < 0 on error. |
| 387 | */ |
| 388 | int pasemi_dma_alloc_flag(void) |
| 389 | { |
| 390 | int bit; |
| 391 | |
| 392 | retry: |
| 393 | bit = find_next_bit(flags_free, MAX_FLAGS, 0); |
| 394 | if (bit >= MAX_FLAGS) |
| 395 | return -ENOSPC; |
| 396 | if (!test_and_clear_bit(bit, flags_free)) |
| 397 | goto retry; |
| 398 | |
| 399 | return bit; |
| 400 | } |
| 401 | EXPORT_SYMBOL(pasemi_dma_alloc_flag); |
| 402 | |
| 403 | |
| 404 | /* pasemi_dma_free_flag - Deallocates a flag (event) |
| 405 | * @flag: Flag number to deallocate |
| 406 | * |
| 407 | * Frees up a flag so it can be reused for other purposes. |
| 408 | */ |
| 409 | void pasemi_dma_free_flag(int flag) |
| 410 | { |
| 411 | BUG_ON(test_bit(flag, flags_free)); |
| 412 | BUG_ON(flag >= MAX_FLAGS); |
| 413 | set_bit(flag, flags_free); |
| 414 | } |
| 415 | EXPORT_SYMBOL(pasemi_dma_free_flag); |
| 416 | |
| 417 | |
| 418 | /* pasemi_dma_set_flag - Sets a flag (event) to 1 |
| 419 | * @flag: Flag number to set active |
| 420 | * |
| 421 | * Sets the flag provided to 1. |
| 422 | */ |
| 423 | void pasemi_dma_set_flag(int flag) |
| 424 | { |
| 425 | BUG_ON(flag >= MAX_FLAGS); |
| 426 | if (flag < 32) |
| 427 | pasemi_write_dma_reg(PAS_DMA_TXF_SFLG0, 1 << flag); |
| 428 | else |
| 429 | pasemi_write_dma_reg(PAS_DMA_TXF_SFLG1, 1 << flag); |
| 430 | } |
| 431 | EXPORT_SYMBOL(pasemi_dma_set_flag); |
| 432 | |
| 433 | /* pasemi_dma_clear_flag - Sets a flag (event) to 0 |
| 434 | * @flag: Flag number to set inactive |
| 435 | * |
| 436 | * Sets the flag provided to 0. |
| 437 | */ |
| 438 | void pasemi_dma_clear_flag(int flag) |
| 439 | { |
| 440 | BUG_ON(flag >= MAX_FLAGS); |
| 441 | if (flag < 32) |
| 442 | pasemi_write_dma_reg(PAS_DMA_TXF_CFLG0, 1 << flag); |
| 443 | else |
| 444 | pasemi_write_dma_reg(PAS_DMA_TXF_CFLG1, 1 << flag); |
| 445 | } |
| 446 | EXPORT_SYMBOL(pasemi_dma_clear_flag); |
| 447 | |
Olof Johansson | dda56df | 2008-03-05 12:25:59 -0600 | [diff] [blame] | 448 | /* pasemi_dma_alloc_fun - Allocate a function engine |
| 449 | * |
| 450 | * Allocates a function engine to use for crypto/checksum offload |
| 451 | * Returns allocated engine (0-8), < 0 on error. |
| 452 | */ |
| 453 | int pasemi_dma_alloc_fun(void) |
| 454 | { |
| 455 | int bit; |
| 456 | |
| 457 | retry: |
| 458 | bit = find_next_bit(fun_free, MAX_FLAGS, 0); |
| 459 | if (bit >= MAX_FLAGS) |
| 460 | return -ENOSPC; |
| 461 | if (!test_and_clear_bit(bit, fun_free)) |
| 462 | goto retry; |
| 463 | |
| 464 | return bit; |
| 465 | } |
| 466 | EXPORT_SYMBOL(pasemi_dma_alloc_fun); |
| 467 | |
| 468 | |
| 469 | /* pasemi_dma_free_fun - Deallocates a function engine |
| 470 | * @flag: Engine number to deallocate |
| 471 | * |
| 472 | * Frees up a function engine so it can be used for other purposes. |
| 473 | */ |
| 474 | void pasemi_dma_free_fun(int fun) |
| 475 | { |
| 476 | BUG_ON(test_bit(fun, fun_free)); |
| 477 | BUG_ON(fun >= MAX_FLAGS); |
| 478 | set_bit(fun, fun_free); |
| 479 | } |
| 480 | EXPORT_SYMBOL(pasemi_dma_free_fun); |
| 481 | |
| 482 | |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 483 | static void *map_onedev(struct pci_dev *p, int index) |
| 484 | { |
| 485 | struct device_node *dn; |
| 486 | void __iomem *ret; |
| 487 | |
| 488 | dn = pci_device_to_OF_node(p); |
| 489 | if (!dn) |
| 490 | goto fallback; |
| 491 | |
| 492 | ret = of_iomap(dn, index); |
| 493 | if (!ret) |
| 494 | goto fallback; |
| 495 | |
| 496 | return ret; |
| 497 | fallback: |
| 498 | /* This is hardcoded and ugly, but we have some firmware versions |
| 499 | * that don't provide the register space in the device tree. Luckily |
| 500 | * they are at well-known locations so we can just do the math here. |
| 501 | */ |
| 502 | return ioremap(0xe0000000 + (p->devfn << 12), 0x2000); |
| 503 | } |
| 504 | |
| 505 | /* pasemi_dma_init - Initialize the PA Semi DMA library |
| 506 | * |
| 507 | * This function initializes the DMA library. It must be called before |
| 508 | * any other function in the library. |
| 509 | * |
| 510 | * Returns 0 on success, errno on failure. |
| 511 | */ |
| 512 | int pasemi_dma_init(void) |
| 513 | { |
Julia Lawall | 1d5bc03 | 2008-12-25 04:34:04 +0000 | [diff] [blame] | 514 | static DEFINE_SPINLOCK(init_lock); |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 515 | struct pci_dev *iob_pdev; |
| 516 | struct pci_dev *pdev; |
| 517 | struct resource res; |
| 518 | struct device_node *dn; |
| 519 | int i, intf, err = 0; |
Olof Johansson | afea327 | 2008-03-05 12:11:48 -0600 | [diff] [blame] | 520 | unsigned long timeout; |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 521 | u32 tmp; |
| 522 | |
| 523 | if (!machine_is(pasemi)) |
| 524 | return -ENODEV; |
| 525 | |
| 526 | spin_lock(&init_lock); |
| 527 | |
| 528 | /* Make sure we haven't already initialized */ |
| 529 | if (dma_pdev) |
| 530 | goto out; |
| 531 | |
| 532 | iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL); |
| 533 | if (!iob_pdev) { |
| 534 | BUG(); |
| 535 | printk(KERN_WARNING "Can't find I/O Bridge\n"); |
| 536 | err = -ENODEV; |
| 537 | goto out; |
| 538 | } |
| 539 | iob_regs = map_onedev(iob_pdev, 0); |
| 540 | |
| 541 | dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL); |
| 542 | if (!dma_pdev) { |
| 543 | BUG(); |
| 544 | printk(KERN_WARNING "Can't find DMA controller\n"); |
| 545 | err = -ENODEV; |
| 546 | goto out; |
| 547 | } |
| 548 | dma_regs = map_onedev(dma_pdev, 0); |
| 549 | base_hw_irq = virq_to_hw(dma_pdev->irq); |
| 550 | |
| 551 | pci_read_config_dword(dma_pdev, PAS_DMA_CAP_TXCH, &tmp); |
| 552 | num_txch = (tmp & PAS_DMA_CAP_TXCH_TCHN_M) >> PAS_DMA_CAP_TXCH_TCHN_S; |
| 553 | |
| 554 | pci_read_config_dword(dma_pdev, PAS_DMA_CAP_RXCH, &tmp); |
| 555 | num_rxch = (tmp & PAS_DMA_CAP_RXCH_RCHN_M) >> PAS_DMA_CAP_RXCH_RCHN_S; |
| 556 | |
| 557 | intf = 0; |
| 558 | for (pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa006, NULL); |
| 559 | pdev; |
| 560 | pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa006, pdev)) |
| 561 | mac_regs[intf++] = map_onedev(pdev, 0); |
| 562 | |
| 563 | pci_dev_put(pdev); |
| 564 | |
| 565 | for (pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa005, NULL); |
| 566 | pdev; |
| 567 | pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa005, pdev)) |
| 568 | mac_regs[intf++] = map_onedev(pdev, 0); |
| 569 | |
| 570 | pci_dev_put(pdev); |
| 571 | |
| 572 | dn = pci_device_to_OF_node(iob_pdev); |
| 573 | if (dn) |
| 574 | err = of_address_to_resource(dn, 1, &res); |
| 575 | if (!dn || err) { |
| 576 | /* Fallback for old firmware */ |
| 577 | res.start = 0xfd800000; |
| 578 | res.end = res.start + 0x1000; |
| 579 | } |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 580 | dma_status = __ioremap(res.start, resource_size(&res), 0); |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 581 | pci_dev_put(iob_pdev); |
| 582 | |
| 583 | for (i = 0; i < MAX_TXCH; i++) |
| 584 | __set_bit(i, txch_free); |
| 585 | |
| 586 | for (i = 0; i < MAX_RXCH; i++) |
| 587 | __set_bit(i, rxch_free); |
| 588 | |
Olof Johansson | afea327 | 2008-03-05 12:11:48 -0600 | [diff] [blame] | 589 | timeout = jiffies + HZ; |
| 590 | pasemi_write_dma_reg(PAS_DMA_COM_RXCMD, 0); |
| 591 | while (pasemi_read_dma_reg(PAS_DMA_COM_RXSTA) & 1) { |
| 592 | if (time_after(jiffies, timeout)) { |
| 593 | pr_warning("Warning: Could not disable RX section\n"); |
| 594 | break; |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | timeout = jiffies + HZ; |
| 599 | pasemi_write_dma_reg(PAS_DMA_COM_TXCMD, 0); |
| 600 | while (pasemi_read_dma_reg(PAS_DMA_COM_TXSTA) & 1) { |
| 601 | if (time_after(jiffies, timeout)) { |
| 602 | pr_warning("Warning: Could not disable TX section\n"); |
| 603 | break; |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | /* setup resource allocations for the different DMA sections */ |
| 608 | tmp = pasemi_read_dma_reg(PAS_DMA_COM_CFG); |
| 609 | pasemi_write_dma_reg(PAS_DMA_COM_CFG, tmp | 0x18000000); |
| 610 | |
| 611 | /* enable tx section */ |
| 612 | pasemi_write_dma_reg(PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN); |
| 613 | |
| 614 | /* enable rx section */ |
| 615 | pasemi_write_dma_reg(PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN); |
| 616 | |
Olof Johansson | f37203b | 2008-03-05 12:25:45 -0600 | [diff] [blame] | 617 | for (i = 0; i < MAX_FLAGS; i++) |
| 618 | __set_bit(i, flags_free); |
| 619 | |
Olof Johansson | dda56df | 2008-03-05 12:25:59 -0600 | [diff] [blame] | 620 | for (i = 0; i < MAX_FUN; i++) |
| 621 | __set_bit(i, fun_free); |
| 622 | |
Olof Johansson | f37203b | 2008-03-05 12:25:45 -0600 | [diff] [blame] | 623 | /* clear all status flags */ |
| 624 | pasemi_write_dma_reg(PAS_DMA_TXF_CFLG0, 0xffffffff); |
| 625 | pasemi_write_dma_reg(PAS_DMA_TXF_CFLG1, 0xffffffff); |
| 626 | |
Olof Johansson | 8ee9d85 | 2007-11-28 20:56:20 -0600 | [diff] [blame] | 627 | printk(KERN_INFO "PA Semi PWRficient DMA library initialized " |
| 628 | "(%d tx, %d rx channels)\n", num_txch, num_rxch); |
| 629 | |
| 630 | out: |
| 631 | spin_unlock(&init_lock); |
| 632 | return err; |
| 633 | } |
Olof Johansson | 06daa16 | 2007-12-14 02:06:55 -0600 | [diff] [blame] | 634 | EXPORT_SYMBOL(pasemi_dma_init); |