John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 1 | /* |
| 2 | |
| 3 | Broadcom BCM43xx wireless driver |
| 4 | |
| 5 | DMA ringbuffer and descriptor allocation/management |
| 6 | |
| 7 | Copyright (c) 2005 Michael Buesch <mbuesch@freenet.de> |
| 8 | |
| 9 | Some code in this file is derived from the b44.c driver |
| 10 | Copyright (C) 2002 David S. Miller |
| 11 | Copyright (C) Pekka Pietikainen |
| 12 | |
| 13 | This program is free software; you can redistribute it and/or modify |
| 14 | it under the terms of the GNU General Public License as published by |
| 15 | the Free Software Foundation; either version 2 of the License, or |
| 16 | (at your option) any later version. |
| 17 | |
| 18 | This program is distributed in the hope that it will be useful, |
| 19 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | GNU General Public License for more details. |
| 22 | |
| 23 | You should have received a copy of the GNU General Public License |
| 24 | along with this program; see the file COPYING. If not, write to |
| 25 | the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, |
| 26 | Boston, MA 02110-1301, USA. |
| 27 | |
| 28 | */ |
| 29 | |
| 30 | #include "bcm43xx.h" |
| 31 | #include "bcm43xx_dma.h" |
| 32 | #include "bcm43xx_main.h" |
| 33 | #include "bcm43xx_debugfs.h" |
| 34 | #include "bcm43xx_power.h" |
Michael Buesch | f398f02 | 2006-02-23 21:15:39 +0100 | [diff] [blame] | 35 | #include "bcm43xx_xmit.h" |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 36 | |
Michael Buesch | d1ca6c4 | 2006-03-25 15:43:18 +0100 | [diff] [blame] | 37 | #include <linux/dma-mapping.h> |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 38 | #include <linux/pci.h> |
| 39 | #include <linux/delay.h> |
| 40 | #include <linux/skbuff.h> |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 41 | |
| 42 | |
| 43 | static inline int free_slots(struct bcm43xx_dmaring *ring) |
| 44 | { |
| 45 | return (ring->nr_slots - ring->used_slots); |
| 46 | } |
| 47 | |
| 48 | static inline int next_slot(struct bcm43xx_dmaring *ring, int slot) |
| 49 | { |
| 50 | assert(slot >= -1 && slot <= ring->nr_slots - 1); |
| 51 | if (slot == ring->nr_slots - 1) |
| 52 | return 0; |
| 53 | return slot + 1; |
| 54 | } |
| 55 | |
| 56 | static inline int prev_slot(struct bcm43xx_dmaring *ring, int slot) |
| 57 | { |
| 58 | assert(slot >= 0 && slot <= ring->nr_slots - 1); |
| 59 | if (slot == 0) |
| 60 | return ring->nr_slots - 1; |
| 61 | return slot - 1; |
| 62 | } |
| 63 | |
| 64 | /* Request a slot for usage. */ |
| 65 | static inline |
| 66 | int request_slot(struct bcm43xx_dmaring *ring) |
| 67 | { |
| 68 | int slot; |
| 69 | |
| 70 | assert(ring->tx); |
| 71 | assert(!ring->suspended); |
| 72 | assert(free_slots(ring) != 0); |
| 73 | |
| 74 | slot = next_slot(ring, ring->current_slot); |
| 75 | ring->current_slot = slot; |
| 76 | ring->used_slots++; |
| 77 | |
| 78 | /* Check the number of available slots and suspend TX, |
| 79 | * if we are running low on free slots. |
| 80 | */ |
| 81 | if (unlikely(free_slots(ring) < ring->suspend_mark)) { |
| 82 | netif_stop_queue(ring->bcm->net_dev); |
| 83 | ring->suspended = 1; |
| 84 | } |
| 85 | #ifdef CONFIG_BCM43XX_DEBUG |
| 86 | if (ring->used_slots > ring->max_used_slots) |
| 87 | ring->max_used_slots = ring->used_slots; |
| 88 | #endif /* CONFIG_BCM43XX_DEBUG*/ |
| 89 | |
| 90 | return slot; |
| 91 | } |
| 92 | |
| 93 | /* Return a slot to the free slots. */ |
| 94 | static inline |
| 95 | void return_slot(struct bcm43xx_dmaring *ring, int slot) |
| 96 | { |
| 97 | assert(ring->tx); |
| 98 | |
| 99 | ring->used_slots--; |
| 100 | |
| 101 | /* Check if TX is suspended and check if we have |
| 102 | * enough free slots to resume it again. |
| 103 | */ |
| 104 | if (unlikely(ring->suspended)) { |
| 105 | if (free_slots(ring) >= ring->resume_mark) { |
| 106 | ring->suspended = 0; |
| 107 | netif_wake_queue(ring->bcm->net_dev); |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | static inline |
| 113 | dma_addr_t map_descbuffer(struct bcm43xx_dmaring *ring, |
| 114 | unsigned char *buf, |
| 115 | size_t len, |
| 116 | int tx) |
| 117 | { |
| 118 | dma_addr_t dmaaddr; |
| 119 | |
| 120 | if (tx) { |
| 121 | dmaaddr = dma_map_single(&ring->bcm->pci_dev->dev, |
| 122 | buf, len, |
| 123 | DMA_TO_DEVICE); |
| 124 | } else { |
| 125 | dmaaddr = dma_map_single(&ring->bcm->pci_dev->dev, |
| 126 | buf, len, |
| 127 | DMA_FROM_DEVICE); |
| 128 | } |
| 129 | |
| 130 | return dmaaddr; |
| 131 | } |
| 132 | |
| 133 | static inline |
| 134 | void unmap_descbuffer(struct bcm43xx_dmaring *ring, |
| 135 | dma_addr_t addr, |
| 136 | size_t len, |
| 137 | int tx) |
| 138 | { |
| 139 | if (tx) { |
| 140 | dma_unmap_single(&ring->bcm->pci_dev->dev, |
| 141 | addr, len, |
| 142 | DMA_TO_DEVICE); |
| 143 | } else { |
| 144 | dma_unmap_single(&ring->bcm->pci_dev->dev, |
| 145 | addr, len, |
| 146 | DMA_FROM_DEVICE); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | static inline |
| 151 | void sync_descbuffer_for_cpu(struct bcm43xx_dmaring *ring, |
| 152 | dma_addr_t addr, |
| 153 | size_t len) |
| 154 | { |
| 155 | assert(!ring->tx); |
| 156 | |
| 157 | dma_sync_single_for_cpu(&ring->bcm->pci_dev->dev, |
| 158 | addr, len, DMA_FROM_DEVICE); |
| 159 | } |
| 160 | |
| 161 | static inline |
| 162 | void sync_descbuffer_for_device(struct bcm43xx_dmaring *ring, |
| 163 | dma_addr_t addr, |
| 164 | size_t len) |
| 165 | { |
| 166 | assert(!ring->tx); |
| 167 | |
| 168 | dma_sync_single_for_device(&ring->bcm->pci_dev->dev, |
| 169 | addr, len, DMA_FROM_DEVICE); |
| 170 | } |
| 171 | |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 172 | /* Unmap and free a descriptor buffer. */ |
| 173 | static inline |
| 174 | void free_descriptor_buffer(struct bcm43xx_dmaring *ring, |
| 175 | struct bcm43xx_dmadesc *desc, |
| 176 | struct bcm43xx_dmadesc_meta *meta, |
| 177 | int irq_context) |
| 178 | { |
| 179 | assert(meta->skb); |
Pete Zaitcev | 512a809 | 2006-03-07 01:37:51 +0100 | [diff] [blame] | 180 | if (irq_context) |
| 181 | dev_kfree_skb_irq(meta->skb); |
| 182 | else |
| 183 | dev_kfree_skb(meta->skb); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 184 | meta->skb = NULL; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | static int alloc_ringmemory(struct bcm43xx_dmaring *ring) |
| 188 | { |
| 189 | struct device *dev = &(ring->bcm->pci_dev->dev); |
| 190 | |
| 191 | ring->vbase = dma_alloc_coherent(dev, BCM43xx_DMA_RINGMEMSIZE, |
| 192 | &(ring->dmabase), GFP_KERNEL); |
| 193 | if (!ring->vbase) { |
| 194 | printk(KERN_ERR PFX "DMA ringmemory allocation failed\n"); |
| 195 | return -ENOMEM; |
| 196 | } |
| 197 | if (ring->dmabase + BCM43xx_DMA_RINGMEMSIZE > BCM43xx_DMA_BUSADDRMAX) { |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 198 | printk(KERN_ERR PFX ">>>FATAL ERROR<<< DMA RINGMEMORY >1G " |
| 199 | "(0x%08x, len: %lu)\n", |
| 200 | ring->dmabase, BCM43xx_DMA_RINGMEMSIZE); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 201 | dma_free_coherent(dev, BCM43xx_DMA_RINGMEMSIZE, |
| 202 | ring->vbase, ring->dmabase); |
| 203 | return -ENOMEM; |
| 204 | } |
| 205 | assert(!(ring->dmabase & 0x000003FF)); |
| 206 | memset(ring->vbase, 0, BCM43xx_DMA_RINGMEMSIZE); |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | static void free_ringmemory(struct bcm43xx_dmaring *ring) |
| 212 | { |
| 213 | struct device *dev = &(ring->bcm->pci_dev->dev); |
| 214 | |
| 215 | dma_free_coherent(dev, BCM43xx_DMA_RINGMEMSIZE, |
| 216 | ring->vbase, ring->dmabase); |
| 217 | } |
| 218 | |
| 219 | /* Reset the RX DMA channel */ |
| 220 | int bcm43xx_dmacontroller_rx_reset(struct bcm43xx_private *bcm, |
| 221 | u16 mmio_base) |
| 222 | { |
| 223 | int i; |
| 224 | u32 value; |
| 225 | |
| 226 | bcm43xx_write32(bcm, |
| 227 | mmio_base + BCM43xx_DMA_RX_CONTROL, |
| 228 | 0x00000000); |
| 229 | for (i = 0; i < 1000; i++) { |
| 230 | value = bcm43xx_read32(bcm, |
| 231 | mmio_base + BCM43xx_DMA_RX_STATUS); |
| 232 | value &= BCM43xx_DMA_RXSTAT_STAT_MASK; |
| 233 | if (value == BCM43xx_DMA_RXSTAT_STAT_DISABLED) { |
| 234 | i = -1; |
| 235 | break; |
| 236 | } |
| 237 | udelay(10); |
| 238 | } |
| 239 | if (i != -1) { |
| 240 | printk(KERN_ERR PFX "Error: Wait on DMA RX status timed out.\n"); |
| 241 | return -ENODEV; |
| 242 | } |
| 243 | |
| 244 | return 0; |
| 245 | } |
| 246 | |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 247 | /* Reset the RX DMA channel */ |
| 248 | int bcm43xx_dmacontroller_tx_reset(struct bcm43xx_private *bcm, |
| 249 | u16 mmio_base) |
| 250 | { |
| 251 | int i; |
| 252 | u32 value; |
| 253 | |
| 254 | for (i = 0; i < 1000; i++) { |
| 255 | value = bcm43xx_read32(bcm, |
| 256 | mmio_base + BCM43xx_DMA_TX_STATUS); |
| 257 | value &= BCM43xx_DMA_TXSTAT_STAT_MASK; |
| 258 | if (value == BCM43xx_DMA_TXSTAT_STAT_DISABLED || |
| 259 | value == BCM43xx_DMA_TXSTAT_STAT_IDLEWAIT || |
| 260 | value == BCM43xx_DMA_TXSTAT_STAT_STOPPED) |
| 261 | break; |
| 262 | udelay(10); |
| 263 | } |
| 264 | bcm43xx_write32(bcm, |
| 265 | mmio_base + BCM43xx_DMA_TX_CONTROL, |
| 266 | 0x00000000); |
| 267 | for (i = 0; i < 1000; i++) { |
| 268 | value = bcm43xx_read32(bcm, |
| 269 | mmio_base + BCM43xx_DMA_TX_STATUS); |
| 270 | value &= BCM43xx_DMA_TXSTAT_STAT_MASK; |
| 271 | if (value == BCM43xx_DMA_TXSTAT_STAT_DISABLED) { |
| 272 | i = -1; |
| 273 | break; |
| 274 | } |
| 275 | udelay(10); |
| 276 | } |
| 277 | if (i != -1) { |
| 278 | printk(KERN_ERR PFX "Error: Wait on DMA TX status timed out.\n"); |
| 279 | return -ENODEV; |
| 280 | } |
| 281 | /* ensure the reset is completed. */ |
| 282 | udelay(300); |
| 283 | |
| 284 | return 0; |
| 285 | } |
| 286 | |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 287 | static int setup_rx_descbuffer(struct bcm43xx_dmaring *ring, |
| 288 | struct bcm43xx_dmadesc *desc, |
| 289 | struct bcm43xx_dmadesc_meta *meta, |
| 290 | gfp_t gfp_flags) |
| 291 | { |
| 292 | struct bcm43xx_rxhdr *rxhdr; |
| 293 | dma_addr_t dmaaddr; |
| 294 | u32 desc_addr; |
| 295 | u32 desc_ctl; |
| 296 | const int slot = (int)(desc - ring->vbase); |
| 297 | struct sk_buff *skb; |
| 298 | |
| 299 | assert(slot >= 0 && slot < ring->nr_slots); |
| 300 | assert(!ring->tx); |
| 301 | |
| 302 | skb = __dev_alloc_skb(ring->rx_buffersize, gfp_flags); |
| 303 | if (unlikely(!skb)) |
| 304 | return -ENOMEM; |
| 305 | dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0); |
| 306 | if (unlikely(dmaaddr + ring->rx_buffersize > BCM43xx_DMA_BUSADDRMAX)) { |
| 307 | unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); |
| 308 | dev_kfree_skb_any(skb); |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 309 | printk(KERN_ERR PFX ">>>FATAL ERROR<<< DMA RX SKB >1G " |
| 310 | "(0x%08x, len: %u)\n", |
| 311 | dmaaddr, ring->rx_buffersize); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 312 | return -ENOMEM; |
| 313 | } |
| 314 | meta->skb = skb; |
| 315 | meta->dmaaddr = dmaaddr; |
| 316 | skb->dev = ring->bcm->net_dev; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 317 | desc_addr = (u32)(dmaaddr + ring->memoffset); |
| 318 | desc_ctl = (BCM43xx_DMADTOR_BYTECNT_MASK & |
| 319 | (u32)(ring->rx_buffersize - ring->frameoffset)); |
| 320 | if (slot == ring->nr_slots - 1) |
| 321 | desc_ctl |= BCM43xx_DMADTOR_DTABLEEND; |
| 322 | set_desc_addr(desc, desc_addr); |
| 323 | set_desc_ctl(desc, desc_ctl); |
| 324 | |
| 325 | rxhdr = (struct bcm43xx_rxhdr *)(skb->data); |
| 326 | rxhdr->frame_length = 0; |
| 327 | rxhdr->flags1 = 0; |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | /* Allocate the initial descbuffers. |
| 333 | * This is used for an RX ring only. |
| 334 | */ |
| 335 | static int alloc_initial_descbuffers(struct bcm43xx_dmaring *ring) |
| 336 | { |
| 337 | int i, err = -ENOMEM; |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 338 | struct bcm43xx_dmadesc *desc; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 339 | struct bcm43xx_dmadesc_meta *meta; |
| 340 | |
| 341 | for (i = 0; i < ring->nr_slots; i++) { |
| 342 | desc = ring->vbase + i; |
| 343 | meta = ring->meta + i; |
| 344 | |
| 345 | err = setup_rx_descbuffer(ring, desc, meta, GFP_KERNEL); |
| 346 | if (err) |
| 347 | goto err_unwind; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 348 | } |
| 349 | ring->used_slots = ring->nr_slots; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 350 | err = 0; |
| 351 | out: |
| 352 | return err; |
| 353 | |
| 354 | err_unwind: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 355 | for (i--; i >= 0; i--) { |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 356 | desc = ring->vbase + i; |
| 357 | meta = ring->meta + i; |
| 358 | |
| 359 | unmap_descbuffer(ring, meta->dmaaddr, ring->rx_buffersize, 0); |
| 360 | dev_kfree_skb(meta->skb); |
| 361 | } |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 362 | goto out; |
| 363 | } |
| 364 | |
| 365 | /* Do initial setup of the DMA controller. |
| 366 | * Reset the controller, write the ring busaddress |
| 367 | * and switch the "enable" bit on. |
| 368 | */ |
| 369 | static int dmacontroller_setup(struct bcm43xx_dmaring *ring) |
| 370 | { |
| 371 | int err = 0; |
| 372 | u32 value; |
| 373 | |
| 374 | if (ring->tx) { |
| 375 | /* Set Transmit Control register to "transmit enable" */ |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 376 | bcm43xx_dma_write(ring, BCM43xx_DMA_TX_CONTROL, |
| 377 | BCM43xx_DMA_TXCTRL_ENABLE); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 378 | /* Set Transmit Descriptor ring address. */ |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 379 | bcm43xx_dma_write(ring, BCM43xx_DMA_TX_DESC_RING, |
| 380 | ring->dmabase + ring->memoffset); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 381 | } else { |
| 382 | err = alloc_initial_descbuffers(ring); |
| 383 | if (err) |
| 384 | goto out; |
| 385 | /* Set Receive Control "receive enable" and frame offset */ |
| 386 | value = (ring->frameoffset << BCM43xx_DMA_RXCTRL_FRAMEOFF_SHIFT); |
| 387 | value |= BCM43xx_DMA_RXCTRL_ENABLE; |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 388 | bcm43xx_dma_write(ring, BCM43xx_DMA_RX_CONTROL, value); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 389 | /* Set Receive Descriptor ring address. */ |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 390 | bcm43xx_dma_write(ring, BCM43xx_DMA_RX_DESC_RING, |
| 391 | ring->dmabase + ring->memoffset); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 392 | /* Init the descriptor pointer. */ |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 393 | bcm43xx_dma_write(ring, BCM43xx_DMA_RX_DESC_INDEX, 200); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 394 | } |
| 395 | |
| 396 | out: |
| 397 | return err; |
| 398 | } |
| 399 | |
| 400 | /* Shutdown the DMA controller. */ |
| 401 | static void dmacontroller_cleanup(struct bcm43xx_dmaring *ring) |
| 402 | { |
| 403 | if (ring->tx) { |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 404 | bcm43xx_dmacontroller_tx_reset(ring->bcm, ring->mmio_base); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 405 | /* Zero out Transmit Descriptor ring address. */ |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 406 | bcm43xx_dma_write(ring, BCM43xx_DMA_TX_DESC_RING, 0); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 407 | } else { |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 408 | bcm43xx_dmacontroller_rx_reset(ring->bcm, ring->mmio_base); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 409 | /* Zero out Receive Descriptor ring address. */ |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 410 | bcm43xx_dma_write(ring, BCM43xx_DMA_RX_DESC_RING, 0); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 411 | } |
| 412 | } |
| 413 | |
| 414 | static void free_all_descbuffers(struct bcm43xx_dmaring *ring) |
| 415 | { |
| 416 | struct bcm43xx_dmadesc *desc; |
| 417 | struct bcm43xx_dmadesc_meta *meta; |
| 418 | int i; |
| 419 | |
| 420 | if (!ring->used_slots) |
| 421 | return; |
| 422 | for (i = 0; i < ring->nr_slots; i++) { |
| 423 | desc = ring->vbase + i; |
| 424 | meta = ring->meta + i; |
| 425 | |
| 426 | if (!meta->skb) { |
| 427 | assert(ring->tx); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 428 | continue; |
| 429 | } |
| 430 | if (ring->tx) { |
| 431 | unmap_descbuffer(ring, meta->dmaaddr, |
| 432 | meta->skb->len, 1); |
| 433 | } else { |
| 434 | unmap_descbuffer(ring, meta->dmaaddr, |
| 435 | ring->rx_buffersize, 0); |
| 436 | } |
| 437 | free_descriptor_buffer(ring, desc, meta, 0); |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | /* Main initialization function. */ |
| 442 | static |
| 443 | struct bcm43xx_dmaring * bcm43xx_setup_dmaring(struct bcm43xx_private *bcm, |
| 444 | u16 dma_controller_base, |
| 445 | int nr_descriptor_slots, |
| 446 | int tx) |
| 447 | { |
| 448 | struct bcm43xx_dmaring *ring; |
| 449 | int err; |
| 450 | |
| 451 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); |
| 452 | if (!ring) |
| 453 | goto out; |
| 454 | |
| 455 | ring->meta = kzalloc(sizeof(*ring->meta) * nr_descriptor_slots, |
| 456 | GFP_KERNEL); |
| 457 | if (!ring->meta) |
| 458 | goto err_kfree_ring; |
| 459 | |
| 460 | ring->memoffset = BCM43xx_DMA_DMABUSADDROFFSET; |
| 461 | #ifdef CONFIG_BCM947XX |
| 462 | if (bcm->pci_dev->bus->number == 0) |
| 463 | ring->memoffset = 0; |
| 464 | #endif |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 465 | |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 466 | ring->bcm = bcm; |
| 467 | ring->nr_slots = nr_descriptor_slots; |
| 468 | ring->suspend_mark = ring->nr_slots * BCM43xx_TXSUSPEND_PERCENT / 100; |
| 469 | ring->resume_mark = ring->nr_slots * BCM43xx_TXRESUME_PERCENT / 100; |
| 470 | assert(ring->suspend_mark < ring->resume_mark); |
| 471 | ring->mmio_base = dma_controller_base; |
| 472 | if (tx) { |
| 473 | ring->tx = 1; |
| 474 | ring->current_slot = -1; |
| 475 | } else { |
| 476 | switch (dma_controller_base) { |
| 477 | case BCM43xx_MMIO_DMA1_BASE: |
| 478 | ring->rx_buffersize = BCM43xx_DMA1_RXBUFFERSIZE; |
| 479 | ring->frameoffset = BCM43xx_DMA1_RX_FRAMEOFFSET; |
| 480 | break; |
| 481 | case BCM43xx_MMIO_DMA4_BASE: |
| 482 | ring->rx_buffersize = BCM43xx_DMA4_RXBUFFERSIZE; |
| 483 | ring->frameoffset = BCM43xx_DMA4_RX_FRAMEOFFSET; |
| 484 | break; |
| 485 | default: |
| 486 | assert(0); |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | err = alloc_ringmemory(ring); |
| 491 | if (err) |
| 492 | goto err_kfree_meta; |
| 493 | err = dmacontroller_setup(ring); |
| 494 | if (err) |
| 495 | goto err_free_ringmemory; |
| 496 | |
| 497 | out: |
| 498 | return ring; |
| 499 | |
| 500 | err_free_ringmemory: |
| 501 | free_ringmemory(ring); |
| 502 | err_kfree_meta: |
| 503 | kfree(ring->meta); |
| 504 | err_kfree_ring: |
| 505 | kfree(ring); |
| 506 | ring = NULL; |
| 507 | goto out; |
| 508 | } |
| 509 | |
| 510 | /* Main cleanup function. */ |
| 511 | static void bcm43xx_destroy_dmaring(struct bcm43xx_dmaring *ring) |
| 512 | { |
| 513 | if (!ring) |
| 514 | return; |
| 515 | |
| 516 | dprintk(KERN_INFO PFX "DMA 0x%04x (%s) max used slots: %d/%d\n", |
| 517 | ring->mmio_base, |
| 518 | (ring->tx) ? "TX" : "RX", |
| 519 | ring->max_used_slots, ring->nr_slots); |
| 520 | /* Device IRQs are disabled prior entering this function, |
| 521 | * so no need to take care of concurrency with rx handler stuff. |
| 522 | */ |
| 523 | dmacontroller_cleanup(ring); |
| 524 | free_all_descbuffers(ring); |
| 525 | free_ringmemory(ring); |
| 526 | |
| 527 | kfree(ring->meta); |
| 528 | kfree(ring); |
| 529 | } |
| 530 | |
| 531 | void bcm43xx_dma_free(struct bcm43xx_private *bcm) |
| 532 | { |
Michael Buesch | 49f29efa | 2006-03-14 16:05:26 +0100 | [diff] [blame] | 533 | struct bcm43xx_dma *dma; |
| 534 | |
| 535 | if (bcm43xx_using_pio(bcm)) |
| 536 | return; |
| 537 | dma = bcm43xx_current_dma(bcm); |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 538 | |
| 539 | bcm43xx_destroy_dmaring(dma->rx_ring1); |
| 540 | dma->rx_ring1 = NULL; |
| 541 | bcm43xx_destroy_dmaring(dma->rx_ring0); |
| 542 | dma->rx_ring0 = NULL; |
| 543 | bcm43xx_destroy_dmaring(dma->tx_ring3); |
| 544 | dma->tx_ring3 = NULL; |
| 545 | bcm43xx_destroy_dmaring(dma->tx_ring2); |
| 546 | dma->tx_ring2 = NULL; |
| 547 | bcm43xx_destroy_dmaring(dma->tx_ring1); |
| 548 | dma->tx_ring1 = NULL; |
| 549 | bcm43xx_destroy_dmaring(dma->tx_ring0); |
| 550 | dma->tx_ring0 = NULL; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | int bcm43xx_dma_init(struct bcm43xx_private *bcm) |
| 554 | { |
Michael Buesch | e9357c0 | 2006-03-13 19:27:34 +0100 | [diff] [blame] | 555 | struct bcm43xx_dma *dma = bcm43xx_current_dma(bcm); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 556 | struct bcm43xx_dmaring *ring; |
| 557 | int err = -ENOMEM; |
| 558 | |
| 559 | /* setup TX DMA channels. */ |
| 560 | ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA1_BASE, |
| 561 | BCM43xx_TXRING_SLOTS, 1); |
| 562 | if (!ring) |
| 563 | goto out; |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 564 | dma->tx_ring0 = ring; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 565 | |
| 566 | ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA2_BASE, |
| 567 | BCM43xx_TXRING_SLOTS, 1); |
| 568 | if (!ring) |
| 569 | goto err_destroy_tx0; |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 570 | dma->tx_ring1 = ring; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 571 | |
| 572 | ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA3_BASE, |
| 573 | BCM43xx_TXRING_SLOTS, 1); |
| 574 | if (!ring) |
| 575 | goto err_destroy_tx1; |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 576 | dma->tx_ring2 = ring; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 577 | |
| 578 | ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA4_BASE, |
| 579 | BCM43xx_TXRING_SLOTS, 1); |
| 580 | if (!ring) |
| 581 | goto err_destroy_tx2; |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 582 | dma->tx_ring3 = ring; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 583 | |
| 584 | /* setup RX DMA channels. */ |
| 585 | ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA1_BASE, |
| 586 | BCM43xx_RXRING_SLOTS, 0); |
| 587 | if (!ring) |
| 588 | goto err_destroy_tx3; |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 589 | dma->rx_ring0 = ring; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 590 | |
| 591 | if (bcm->current_core->rev < 5) { |
| 592 | ring = bcm43xx_setup_dmaring(bcm, BCM43xx_MMIO_DMA4_BASE, |
| 593 | BCM43xx_RXRING_SLOTS, 0); |
| 594 | if (!ring) |
| 595 | goto err_destroy_rx0; |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 596 | dma->rx_ring1 = ring; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | dprintk(KERN_INFO PFX "DMA initialized\n"); |
| 600 | err = 0; |
| 601 | out: |
| 602 | return err; |
| 603 | |
| 604 | err_destroy_rx0: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 605 | bcm43xx_destroy_dmaring(dma->rx_ring0); |
| 606 | dma->rx_ring0 = NULL; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 607 | err_destroy_tx3: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 608 | bcm43xx_destroy_dmaring(dma->tx_ring3); |
| 609 | dma->tx_ring3 = NULL; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 610 | err_destroy_tx2: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 611 | bcm43xx_destroy_dmaring(dma->tx_ring2); |
| 612 | dma->tx_ring2 = NULL; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 613 | err_destroy_tx1: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 614 | bcm43xx_destroy_dmaring(dma->tx_ring1); |
| 615 | dma->tx_ring1 = NULL; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 616 | err_destroy_tx0: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 617 | bcm43xx_destroy_dmaring(dma->tx_ring0); |
| 618 | dma->tx_ring0 = NULL; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 619 | goto out; |
| 620 | } |
| 621 | |
| 622 | /* Generate a cookie for the TX header. */ |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 623 | static u16 generate_cookie(struct bcm43xx_dmaring *ring, |
| 624 | int slot) |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 625 | { |
| 626 | u16 cookie = 0x0000; |
| 627 | |
| 628 | /* Use the upper 4 bits of the cookie as |
| 629 | * DMA controller ID and store the slot number |
| 630 | * in the lower 12 bits |
| 631 | */ |
| 632 | switch (ring->mmio_base) { |
| 633 | default: |
| 634 | assert(0); |
| 635 | case BCM43xx_MMIO_DMA1_BASE: |
| 636 | break; |
| 637 | case BCM43xx_MMIO_DMA2_BASE: |
| 638 | cookie = 0x1000; |
| 639 | break; |
| 640 | case BCM43xx_MMIO_DMA3_BASE: |
| 641 | cookie = 0x2000; |
| 642 | break; |
| 643 | case BCM43xx_MMIO_DMA4_BASE: |
| 644 | cookie = 0x3000; |
| 645 | break; |
| 646 | } |
| 647 | assert(((u16)slot & 0xF000) == 0x0000); |
| 648 | cookie |= (u16)slot; |
| 649 | |
| 650 | return cookie; |
| 651 | } |
| 652 | |
| 653 | /* Inspect a cookie and find out to which controller/slot it belongs. */ |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 654 | static |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 655 | struct bcm43xx_dmaring * parse_cookie(struct bcm43xx_private *bcm, |
| 656 | u16 cookie, int *slot) |
| 657 | { |
Michael Buesch | e9357c0 | 2006-03-13 19:27:34 +0100 | [diff] [blame] | 658 | struct bcm43xx_dma *dma = bcm43xx_current_dma(bcm); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 659 | struct bcm43xx_dmaring *ring = NULL; |
| 660 | |
| 661 | switch (cookie & 0xF000) { |
| 662 | case 0x0000: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 663 | ring = dma->tx_ring0; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 664 | break; |
| 665 | case 0x1000: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 666 | ring = dma->tx_ring1; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 667 | break; |
| 668 | case 0x2000: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 669 | ring = dma->tx_ring2; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 670 | break; |
| 671 | case 0x3000: |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 672 | ring = dma->tx_ring3; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 673 | break; |
| 674 | default: |
| 675 | assert(0); |
| 676 | } |
| 677 | *slot = (cookie & 0x0FFF); |
| 678 | assert(*slot >= 0 && *slot < ring->nr_slots); |
| 679 | |
| 680 | return ring; |
| 681 | } |
| 682 | |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 683 | static void dmacontroller_poke_tx(struct bcm43xx_dmaring *ring, |
| 684 | int slot) |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 685 | { |
| 686 | /* Everything is ready to start. Buffers are DMA mapped and |
| 687 | * associated with slots. |
| 688 | * "slot" is the last slot of the new frame we want to transmit. |
| 689 | * Close your seat belts now, please. |
| 690 | */ |
| 691 | wmb(); |
| 692 | slot = next_slot(ring, slot); |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 693 | bcm43xx_dma_write(ring, BCM43xx_DMA_TX_DESC_INDEX, |
| 694 | (u32)(slot * sizeof(struct bcm43xx_dmadesc))); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 695 | } |
| 696 | |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 697 | static int dma_tx_fragment(struct bcm43xx_dmaring *ring, |
| 698 | struct sk_buff *skb, |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 699 | u8 cur_frag) |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 700 | { |
| 701 | int slot; |
| 702 | struct bcm43xx_dmadesc *desc; |
| 703 | struct bcm43xx_dmadesc_meta *meta; |
| 704 | u32 desc_ctl; |
| 705 | u32 desc_addr; |
| 706 | |
| 707 | assert(skb_shinfo(skb)->nr_frags == 0); |
| 708 | |
| 709 | slot = request_slot(ring); |
| 710 | desc = ring->vbase + slot; |
| 711 | meta = ring->meta + slot; |
| 712 | |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 713 | /* Add a device specific TX header. */ |
| 714 | assert(skb_headroom(skb) >= sizeof(struct bcm43xx_txhdr)); |
| 715 | /* Reserve enough headroom for the device tx header. */ |
| 716 | __skb_push(skb, sizeof(struct bcm43xx_txhdr)); |
| 717 | /* Now calculate and add the tx header. |
| 718 | * The tx header includes the PLCP header. |
| 719 | */ |
| 720 | bcm43xx_generate_txhdr(ring->bcm, |
| 721 | (struct bcm43xx_txhdr *)skb->data, |
| 722 | skb->data + sizeof(struct bcm43xx_txhdr), |
| 723 | skb->len - sizeof(struct bcm43xx_txhdr), |
| 724 | (cur_frag == 0), |
| 725 | generate_cookie(ring, slot)); |
| 726 | |
| 727 | meta->skb = skb; |
| 728 | meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1); |
| 729 | if (unlikely(meta->dmaaddr + skb->len > BCM43xx_DMA_BUSADDRMAX)) { |
| 730 | return_slot(ring, slot); |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 731 | printk(KERN_ERR PFX ">>>FATAL ERROR<<< DMA TX SKB >1G " |
| 732 | "(0x%08x, len: %u)\n", |
| 733 | meta->dmaaddr, skb->len); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 734 | return -ENOMEM; |
| 735 | } |
| 736 | |
| 737 | desc_addr = (u32)(meta->dmaaddr + ring->memoffset); |
| 738 | desc_ctl = BCM43xx_DMADTOR_FRAMESTART | BCM43xx_DMADTOR_FRAMEEND; |
| 739 | desc_ctl |= BCM43xx_DMADTOR_COMPIRQ; |
| 740 | desc_ctl |= (BCM43xx_DMADTOR_BYTECNT_MASK & |
| 741 | (u32)(meta->skb->len - ring->frameoffset)); |
| 742 | if (slot == ring->nr_slots - 1) |
| 743 | desc_ctl |= BCM43xx_DMADTOR_DTABLEEND; |
| 744 | |
| 745 | set_desc_ctl(desc, desc_ctl); |
| 746 | set_desc_addr(desc, desc_addr); |
| 747 | /* Now transfer the whole frame. */ |
| 748 | dmacontroller_poke_tx(ring, slot); |
| 749 | |
| 750 | return 0; |
| 751 | } |
| 752 | |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 753 | int bcm43xx_dma_tx(struct bcm43xx_private *bcm, |
| 754 | struct ieee80211_txb *txb) |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 755 | { |
| 756 | /* We just received a packet from the kernel network subsystem. |
| 757 | * Add headers and DMA map the memory. Poke |
| 758 | * the device to send the stuff. |
| 759 | * Note that this is called from atomic context. |
| 760 | */ |
Michael Buesch | e9357c0 | 2006-03-13 19:27:34 +0100 | [diff] [blame] | 761 | struct bcm43xx_dmaring *ring = bcm43xx_current_dma(bcm)->tx_ring1; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 762 | u8 i; |
| 763 | struct sk_buff *skb; |
| 764 | |
| 765 | assert(ring->tx); |
| 766 | if (unlikely(free_slots(ring) < txb->nr_frags)) { |
| 767 | /* The queue should be stopped, |
| 768 | * if we are low on free slots. |
| 769 | * If this ever triggers, we have to lower the suspend_mark. |
| 770 | */ |
| 771 | dprintkl(KERN_ERR PFX "Out of DMA descriptor slots!\n"); |
| 772 | return -ENOMEM; |
| 773 | } |
| 774 | |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 775 | for (i = 0; i < txb->nr_frags; i++) { |
| 776 | skb = txb->fragments[i]; |
Pete Zaitcev | 512a809 | 2006-03-07 01:37:51 +0100 | [diff] [blame] | 777 | /* Take skb from ieee80211_txb_free */ |
| 778 | txb->fragments[i] = NULL; |
| 779 | dma_tx_fragment(ring, skb, i); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 780 | //TODO: handle failure of dma_tx_fragment |
| 781 | } |
Pete Zaitcev | 512a809 | 2006-03-07 01:37:51 +0100 | [diff] [blame] | 782 | ieee80211_txb_free(txb); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 783 | |
| 784 | return 0; |
| 785 | } |
| 786 | |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 787 | void bcm43xx_dma_handle_xmitstatus(struct bcm43xx_private *bcm, |
| 788 | struct bcm43xx_xmitstatus *status) |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 789 | { |
| 790 | struct bcm43xx_dmaring *ring; |
| 791 | struct bcm43xx_dmadesc *desc; |
| 792 | struct bcm43xx_dmadesc_meta *meta; |
| 793 | int is_last_fragment; |
| 794 | int slot; |
| 795 | |
| 796 | ring = parse_cookie(bcm, status->cookie, &slot); |
| 797 | assert(ring); |
| 798 | assert(ring->tx); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 799 | assert(get_desc_ctl(ring->vbase + slot) & BCM43xx_DMADTOR_FRAMESTART); |
| 800 | while (1) { |
| 801 | assert(slot >= 0 && slot < ring->nr_slots); |
| 802 | desc = ring->vbase + slot; |
| 803 | meta = ring->meta + slot; |
| 804 | |
| 805 | is_last_fragment = !!(get_desc_ctl(desc) & BCM43xx_DMADTOR_FRAMEEND); |
| 806 | unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1); |
| 807 | free_descriptor_buffer(ring, desc, meta, 1); |
| 808 | /* Everything belonging to the slot is unmapped |
| 809 | * and freed, so we can return it. |
| 810 | */ |
| 811 | return_slot(ring, slot); |
| 812 | |
| 813 | if (is_last_fragment) |
| 814 | break; |
| 815 | slot = next_slot(ring, slot); |
| 816 | } |
| 817 | bcm->stats.last_tx = jiffies; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 818 | } |
| 819 | |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 820 | static void dma_rx(struct bcm43xx_dmaring *ring, |
| 821 | int *slot) |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 822 | { |
| 823 | struct bcm43xx_dmadesc *desc; |
| 824 | struct bcm43xx_dmadesc_meta *meta; |
| 825 | struct bcm43xx_rxhdr *rxhdr; |
| 826 | struct sk_buff *skb; |
| 827 | u16 len; |
| 828 | int err; |
| 829 | dma_addr_t dmaaddr; |
| 830 | |
| 831 | desc = ring->vbase + *slot; |
| 832 | meta = ring->meta + *slot; |
| 833 | |
| 834 | sync_descbuffer_for_cpu(ring, meta->dmaaddr, ring->rx_buffersize); |
| 835 | skb = meta->skb; |
| 836 | |
| 837 | if (ring->mmio_base == BCM43xx_MMIO_DMA4_BASE) { |
| 838 | /* We received an xmit status. */ |
| 839 | struct bcm43xx_hwxmitstatus *hw = (struct bcm43xx_hwxmitstatus *)skb->data; |
| 840 | struct bcm43xx_xmitstatus stat; |
| 841 | |
| 842 | stat.cookie = le16_to_cpu(hw->cookie); |
| 843 | stat.flags = hw->flags; |
| 844 | stat.cnt1 = hw->cnt1; |
| 845 | stat.cnt2 = hw->cnt2; |
| 846 | stat.seq = le16_to_cpu(hw->seq); |
| 847 | stat.unknown = le16_to_cpu(hw->unknown); |
| 848 | |
| 849 | bcm43xx_debugfs_log_txstat(ring->bcm, &stat); |
| 850 | bcm43xx_dma_handle_xmitstatus(ring->bcm, &stat); |
| 851 | /* recycle the descriptor buffer. */ |
| 852 | sync_descbuffer_for_device(ring, meta->dmaaddr, ring->rx_buffersize); |
| 853 | |
| 854 | return; |
| 855 | } |
| 856 | rxhdr = (struct bcm43xx_rxhdr *)skb->data; |
| 857 | len = le16_to_cpu(rxhdr->frame_length); |
| 858 | if (len == 0) { |
| 859 | int i = 0; |
| 860 | |
| 861 | do { |
| 862 | udelay(2); |
| 863 | barrier(); |
| 864 | len = le16_to_cpu(rxhdr->frame_length); |
| 865 | } while (len == 0 && i++ < 5); |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 866 | if (unlikely(len == 0)) { |
| 867 | /* recycle the descriptor buffer. */ |
| 868 | sync_descbuffer_for_device(ring, meta->dmaaddr, |
| 869 | ring->rx_buffersize); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 870 | goto drop; |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 871 | } |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 872 | } |
| 873 | if (unlikely(len > ring->rx_buffersize)) { |
| 874 | /* The data did not fit into one descriptor buffer |
| 875 | * and is split over multiple buffers. |
| 876 | * This should never happen, as we try to allocate buffers |
| 877 | * big enough. So simply ignore this packet. |
| 878 | */ |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 879 | int cnt = 0; |
| 880 | s32 tmp = len; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 881 | |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 882 | while (1) { |
| 883 | desc = ring->vbase + *slot; |
| 884 | meta = ring->meta + *slot; |
| 885 | /* recycle the descriptor buffer. */ |
| 886 | sync_descbuffer_for_device(ring, meta->dmaaddr, |
| 887 | ring->rx_buffersize); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 888 | *slot = next_slot(ring, *slot); |
| 889 | cnt++; |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 890 | tmp -= ring->rx_buffersize; |
| 891 | if (tmp <= 0) |
| 892 | break; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 893 | } |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 894 | printkl(KERN_ERR PFX "DMA RX buffer too small " |
| 895 | "(len: %u, buffer: %u, nr-dropped: %d)\n", |
| 896 | len, ring->rx_buffersize, cnt); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 897 | goto drop; |
| 898 | } |
| 899 | len -= IEEE80211_FCS_LEN; |
| 900 | |
| 901 | dmaaddr = meta->dmaaddr; |
| 902 | err = setup_rx_descbuffer(ring, desc, meta, GFP_ATOMIC); |
| 903 | if (unlikely(err)) { |
| 904 | dprintkl(KERN_ERR PFX "DMA RX: setup_rx_descbuffer() failed\n"); |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 905 | sync_descbuffer_for_device(ring, dmaaddr, |
| 906 | ring->rx_buffersize); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 907 | goto drop; |
| 908 | } |
| 909 | |
| 910 | unmap_descbuffer(ring, dmaaddr, ring->rx_buffersize, 0); |
| 911 | skb_put(skb, len + ring->frameoffset); |
| 912 | skb_pull(skb, ring->frameoffset); |
| 913 | |
| 914 | err = bcm43xx_rx(ring->bcm, skb, rxhdr); |
| 915 | if (err) { |
| 916 | dev_kfree_skb_irq(skb); |
| 917 | goto drop; |
| 918 | } |
| 919 | |
| 920 | drop: |
| 921 | return; |
| 922 | } |
| 923 | |
Michael Buesch | ea72ab2 | 2006-01-27 17:26:20 +0100 | [diff] [blame] | 924 | void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring) |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 925 | { |
| 926 | u32 status; |
| 927 | u16 descptr; |
| 928 | int slot, current_slot; |
| 929 | #ifdef CONFIG_BCM43XX_DEBUG |
| 930 | int used_slots = 0; |
| 931 | #endif |
| 932 | |
| 933 | assert(!ring->tx); |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 934 | status = bcm43xx_dma_read(ring, BCM43xx_DMA_RX_STATUS); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 935 | descptr = (status & BCM43xx_DMA_RXSTAT_DPTR_MASK); |
| 936 | current_slot = descptr / sizeof(struct bcm43xx_dmadesc); |
| 937 | assert(current_slot >= 0 && current_slot < ring->nr_slots); |
| 938 | |
| 939 | slot = ring->current_slot; |
| 940 | for ( ; slot != current_slot; slot = next_slot(ring, slot)) { |
| 941 | dma_rx(ring, &slot); |
| 942 | #ifdef CONFIG_BCM43XX_DEBUG |
| 943 | if (++used_slots > ring->max_used_slots) |
| 944 | ring->max_used_slots = used_slots; |
| 945 | #endif |
| 946 | } |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 947 | bcm43xx_dma_write(ring, BCM43xx_DMA_RX_DESC_INDEX, |
| 948 | (u32)(slot * sizeof(struct bcm43xx_dmadesc))); |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 949 | ring->current_slot = slot; |
John W. Linville | f222313 | 2006-01-23 16:59:58 -0500 | [diff] [blame] | 950 | } |
| 951 | |
Michael Buesch | aae3778 | 2006-03-13 15:54:56 +0100 | [diff] [blame] | 952 | void bcm43xx_dma_tx_suspend(struct bcm43xx_dmaring *ring) |
| 953 | { |
| 954 | assert(ring->tx); |
| 955 | bcm43xx_power_saving_ctl_bits(ring->bcm, -1, 1); |
| 956 | bcm43xx_dma_write(ring, BCM43xx_DMA_TX_CONTROL, |
| 957 | bcm43xx_dma_read(ring, BCM43xx_DMA_TX_CONTROL) |
| 958 | | BCM43xx_DMA_TXCTRL_SUSPEND); |
| 959 | } |
| 960 | |
| 961 | void bcm43xx_dma_tx_resume(struct bcm43xx_dmaring *ring) |
| 962 | { |
| 963 | assert(ring->tx); |
| 964 | bcm43xx_dma_write(ring, BCM43xx_DMA_TX_CONTROL, |
| 965 | bcm43xx_dma_read(ring, BCM43xx_DMA_TX_CONTROL) |
| 966 | & ~BCM43xx_DMA_TXCTRL_SUSPEND); |
| 967 | bcm43xx_power_saving_ctl_bits(ring->bcm, -1, -1); |
| 968 | } |