1 /******************************************************************************
3 * This file is provided under a dual BSD/GPLv2 license. When using or
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10 * This program is free software; you can redistribute it and/or modify
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21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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28 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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62 *****************************************************************************/
64 /****************************/
65 /* Flow Handler Definitions */
66 /****************************/
69 * This I/O area is directly read/writable by driver (e.g. Linux uses writel())
70 * Addresses are offsets from device's PCI hardware base address.
72 #define FH_MEM_LOWER_BOUND (0x1000)
73 #define FH_MEM_UPPER_BOUND (0x1EF0)
76 * Keep-Warm (KW) buffer base address.
78 * Driver must allocate a 4KByte buffer that is used by 4965 for keeping the
79 * host DRAM powered on (via dummy accesses to DRAM) to maintain low-latency
80 * DRAM access when 4965 is Txing or Rxing. The dummy accesses prevent host
81 * from going into a power-savings mode that would cause higher DRAM latency,
82 * and possible data over/under-runs, before all Tx/Rx is complete.
84 * Driver loads FH_KW_MEM_ADDR_REG with the physical address (bits 35:4)
85 * of the buffer, which must be 4K aligned. Once this is set up, the 4965
86 * automatically invokes keep-warm accesses when normal accesses might not
87 * be sufficient to maintain fast DRAM response.
90 * 31-0: Keep-warm buffer physical base address [35:4], must be 4K aligned
92 #define FH_KW_MEM_ADDR_REG (FH_MEM_LOWER_BOUND + 0x97C)
96 * TFD Circular Buffers Base (CBBC) addresses
98 * 4965 has 16 base pointer registers, one for each of 16 host-DRAM-resident
99 * circular buffers (CBs/queues) containing Transmit Frame Descriptors (TFDs)
100 * (see struct iwl_tfd_frame). These 16 pointer registers are offset by 0x04
101 * bytes from one another. Each TFD circular buffer in DRAM must be 256-byte
102 * aligned (address bits 0-7 must be 0).
104 * Bit fields in each pointer register:
105 * 27-0: TFD CB physical base address [35:8], must be 256-byte aligned
107 #define FH_MEM_CBBC_LOWER_BOUND (FH_MEM_LOWER_BOUND + 0x9D0)
108 #define FH_MEM_CBBC_UPPER_BOUND (FH_MEM_LOWER_BOUND + 0xA10)
110 /* Find TFD CB base pointer for given queue (range 0-15). */
111 #define FH_MEM_CBBC_QUEUE(x) (FH_MEM_CBBC_LOWER_BOUND + (x) * 0x4)
115 * Rx SRAM Control and Status Registers (RSCSR)
117 * These registers provide handshake between driver and 4965 for the Rx queue
118 * (this queue handles *all* command responses, notifications, Rx data, etc.
119 * sent from 4965 uCode to host driver). Unlike Tx, there is only one Rx
120 * queue, and only one Rx DMA/FIFO channel. Also unlike Tx, which can
121 * concatenate up to 20 DRAM buffers to form a Tx frame, each Receive Buffer
122 * Descriptor (RBD) points to only one Rx Buffer (RB); there is a 1:1
123 * mapping between RBDs and RBs.
125 * Driver must allocate host DRAM memory for the following, and set the
126 * physical address of each into 4965 registers:
128 * 1) Receive Buffer Descriptor (RBD) circular buffer (CB), typically with 256
129 * entries (although any power of 2, up to 4096, is selectable by driver).
130 * Each entry (1 dword) points to a receive buffer (RB) of consistent size
131 * (typically 4K, although 8K or 16K are also selectable by driver).
132 * Driver sets up RB size and number of RBDs in the CB via Rx config
133 * register FH_MEM_RCSR_CHNL0_CONFIG_REG.
135 * Bit fields within one RBD:
136 * 27-0: Receive Buffer physical address bits [35:8], 256-byte aligned
138 * Driver sets physical address [35:8] of base of RBD circular buffer
139 * into FH_RSCSR_CHNL0_RBDCB_BASE_REG [27:0].
141 * 2) Rx status buffer, 8 bytes, in which 4965 indicates which Rx Buffers
142 * (RBs) have been filled, via a "write pointer", actually the index of
143 * the RB's corresponding RBD within the circular buffer. Driver sets
144 * physical address [35:4] into FH_RSCSR_CHNL0_STTS_WPTR_REG [31:0].
146 * Bit fields in lower dword of Rx status buffer (upper dword not used
147 * by driver; see struct iwl4965_shared, val0):
148 * 31-12: Not used by driver
149 * 11- 0: Index of last filled Rx buffer descriptor
150 * (4965 writes, driver reads this value)
152 * As the driver prepares Receive Buffers (RBs) for 4965 to fill, driver must
153 * enter pointers to these RBs into contiguous RBD circular buffer entries,
154 * and update the 4965's "write" index register,
155 * FH_RSCSR_CHNL0_RBDCB_WPTR_REG.
157 * This "write" index corresponds to the *next* RBD that the driver will make
158 * available, i.e. one RBD past the tail of the ready-to-fill RBDs within
159 * the circular buffer. This value should initially be 0 (before preparing any
160 * RBs), should be 8 after preparing the first 8 RBs (for example), and must
161 * wrap back to 0 at the end of the circular buffer (but don't wrap before
162 * "read" index has advanced past 1! See below).
163 * NOTE: 4965 EXPECTS THE WRITE INDEX TO BE INCREMENTED IN MULTIPLES OF 8.
165 * As the 4965 fills RBs (referenced from contiguous RBDs within the circular
166 * buffer), it updates the Rx status buffer in host DRAM, 2) described above,
167 * to tell the driver the index of the latest filled RBD. The driver must
168 * read this "read" index from DRAM after receiving an Rx interrupt from 4965.
170 * The driver must also internally keep track of a third index, which is the
171 * next RBD to process. When receiving an Rx interrupt, driver should process
172 * all filled but unprocessed RBs up to, but not including, the RB
173 * corresponding to the "read" index. For example, if "read" index becomes "1",
174 * driver may process the RB pointed to by RBD 0. Depending on volume of
175 * traffic, there may be many RBs to process.
177 * If read index == write index, 4965 thinks there is no room to put new data.
178 * Due to this, the maximum number of filled RBs is 255, instead of 256. To
179 * be safe, make sure that there is a gap of at least 2 RBDs between "write"
180 * and "read" indexes; that is, make sure that there are no more than 254
181 * buffers waiting to be filled.
183 #define FH_MEM_RSCSR_LOWER_BOUND (FH_MEM_LOWER_BOUND + 0xBC0)
184 #define FH_MEM_RSCSR_UPPER_BOUND (FH_MEM_LOWER_BOUND + 0xC00)
185 #define FH_MEM_RSCSR_CHNL0 (FH_MEM_RSCSR_LOWER_BOUND)
188 * Physical base address of 8-byte Rx Status buffer.
190 * 31-0: Rx status buffer physical base address [35:4], must 16-byte aligned.
192 #define FH_RSCSR_CHNL0_STTS_WPTR_REG (FH_MEM_RSCSR_CHNL0)
195 * Physical base address of Rx Buffer Descriptor Circular Buffer.
197 * 27-0: RBD CD physical base address [35:8], must be 256-byte aligned.
199 #define FH_RSCSR_CHNL0_RBDCB_BASE_REG (FH_MEM_RSCSR_CHNL0 + 0x004)
202 * Rx write pointer (index, really!).
204 * 11-0: Index of driver's most recent prepared-to-be-filled RBD, + 1.
205 * NOTE: For 256-entry circular buffer, use only bits [7:0].
207 #define FH_RSCSR_CHNL0_RBDCB_WPTR_REG (FH_MEM_RSCSR_CHNL0 + 0x008)
208 #define FH_RSCSR_CHNL0_WPTR (FH_RSCSR_CHNL0_RBDCB_WPTR_REG)
212 * Rx Config/Status Registers (RCSR)
213 * Rx Config Reg for channel 0 (only channel used)
215 * Driver must initialize FH_MEM_RCSR_CHNL0_CONFIG_REG as follows for
216 * normal operation (see bit fields).
218 * Clearing FH_MEM_RCSR_CHNL0_CONFIG_REG to 0 turns off Rx DMA.
219 * Driver should poll FH_MEM_RSSR_RX_STATUS_REG for
220 * FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE (bit 24) before continuing.
223 * 31-30: Rx DMA channel enable: '00' off/pause, '01' pause at end of frame,
224 * '10' operate normally
226 * 23-20: # RBDs in circular buffer = 2^value; use "8" for 256 RBDs (normal),
227 * min "5" for 32 RBDs, max "12" for 4096 RBDs.
229 * 17-16: size of each receive buffer; '00' 4K (normal), '01' 8K,
230 * '10' 12K, '11' 16K.
232 * 13-12: IRQ destination; '00' none, '01' host driver (normal operation)
233 * 11- 4: timeout for closing Rx buffer and interrupting host (units 32 usec)
234 * typical value 0x10 (about 1/2 msec)
237 #define FH_MEM_RCSR_LOWER_BOUND (FH_MEM_LOWER_BOUND + 0xC00)
238 #define FH_MEM_RCSR_UPPER_BOUND (FH_MEM_LOWER_BOUND + 0xCC0)
239 #define FH_MEM_RCSR_CHNL0 (FH_MEM_RCSR_LOWER_BOUND)
241 #define FH_MEM_RCSR_CHNL0_CONFIG_REG (FH_MEM_RCSR_CHNL0)
243 #define FH_RCSR_CHNL0_RX_CONFIG_RB_TIMEOUT_MSK (0x00000FF0) /* bits 4-11 */
244 #define FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_MSK (0x00001000) /* bits 12 */
245 #define FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK (0x00008000) /* bit 15 */
246 #define FH_RCSR_CHNL0_RX_CONFIG_RB_SIZE_MSK (0x00030000) /* bits 16-17 */
247 #define FH_RCSR_CHNL0_RX_CONFIG_RBDBC_SIZE_MSK (0x00F00000) /* bits 20-23 */
248 #define FH_RCSR_CHNL0_RX_CONFIG_DMA_CHNL_EN_MSK (0xC0000000) /* bits 30-31*/
250 #define FH_RCSR_RX_CONFIG_RBDCB_SIZE_BITSHIFT (20)
251 #define FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_BITSHIFT (4)
252 #define RX_RB_TIMEOUT (0x10)
254 #define FH_RCSR_RX_CONFIG_CHNL_EN_PAUSE_VAL (0x00000000)
255 #define FH_RCSR_RX_CONFIG_CHNL_EN_PAUSE_EOF_VAL (0x40000000)
256 #define FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL (0x80000000)
258 #define FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K (0x00000000)
259 #define FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K (0x00010000)
260 #define FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_12K (0x00020000)
261 #define FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_16K (0x00030000)
263 #define FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_NO_INT_VAL (0x00000000)
264 #define FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL (0x00001000)
268 * Rx Shared Status Registers (RSSR)
270 * After stopping Rx DMA channel (writing 0 to
271 * FH_MEM_RCSR_CHNL0_CONFIG_REG), driver must poll
272 * FH_MEM_RSSR_RX_STATUS_REG until Rx channel is idle.
275 * 24: 1 = Channel 0 is idle
277 * FH_MEM_RSSR_SHARED_CTRL_REG and FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV
278 * contain default values that should not be altered by the driver.
280 #define FH_MEM_RSSR_LOWER_BOUND (FH_MEM_LOWER_BOUND + 0xC40)
281 #define FH_MEM_RSSR_UPPER_BOUND (FH_MEM_LOWER_BOUND + 0xD00)
283 #define FH_MEM_RSSR_SHARED_CTRL_REG (FH_MEM_RSSR_LOWER_BOUND)
284 #define FH_MEM_RSSR_RX_STATUS_REG (FH_MEM_RSSR_LOWER_BOUND + 0x004)
285 #define FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV\
286 (FH_MEM_RSSR_LOWER_BOUND + 0x008)
288 #define FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE (0x01000000)
292 * Transmit DMA Channel Control/Status Registers (TCSR)
294 * 4965 has one configuration register for each of 8 Tx DMA/FIFO channels
295 * supported in hardware (don't confuse these with the 16 Tx queues in DRAM,
296 * which feed the DMA/FIFO channels); config regs are separated by 0x20 bytes.
298 * To use a Tx DMA channel, driver must initialize its
299 * FH_TCSR_CHNL_TX_CONFIG_REG(chnl) with:
301 * FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
302 * FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE_VAL
304 * All other bits should be 0.
307 * 31-30: Tx DMA channel enable: '00' off/pause, '01' pause at end of frame,
308 * '10' operate normally
309 * 29- 4: Reserved, set to "0"
310 * 3: Enable internal DMA requests (1, normal operation), disable (0)
311 * 2- 0: Reserved, set to "0"
313 #define FH_TCSR_LOWER_BOUND (FH_MEM_LOWER_BOUND + 0xD00)
314 #define FH_TCSR_UPPER_BOUND (FH_MEM_LOWER_BOUND + 0xE60)
316 /* Find Control/Status reg for given Tx DMA/FIFO channel */
317 #define FH_TCSR_CHNL_TX_CONFIG_REG(_chnl) \
318 (FH_TCSR_LOWER_BOUND + 0x20 * _chnl)
320 #define FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_DISABLE_VAL (0x00000000)
321 #define FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE_VAL (0x00000008)
323 #define FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_PAUSE (0x00000000)
324 #define FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_PAUSE_EOF (0x40000000)
325 #define FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE (0x80000000)
327 #define FH_TCSR_CHNL_NUM (7)
329 #define FH_TCSR_CHNL_TX_BUF_STS_REG_VAL_TFDB_EMPTY (0x00000000)
330 #define FH_TCSR_CHNL_TX_BUF_STS_REG_VAL_TFDB_WAIT (0x00002000)
331 #define FH_TCSR_CHNL_TX_BUF_STS_REG_VAL_TFDB_VALID (0x00000003)
333 #define FH_TCSR_TX_CONFIG_REG_VAL_CIRQ_HOST_NOINT (0x00000000)
334 #define FH_TCSR_TX_CONFIG_REG_VAL_CIRQ_HOST_ENDTFD (0x00100000)
335 #define FH_TCSR_TX_CONFIG_REG_VAL_CIRQ_HOST_IFTFD (0x00200000)
337 #define FH_TCSR_CHNL_TX_BUF_STS_REG_POS_TB_NUM (20)
338 #define FH_TCSR_CHNL_TX_BUF_STS_REG_POS_TB_IDX (12)
339 #define FH_TCSR_CHNL_TX_CONFIG_REG(_chnl) \
340 (FH_TCSR_LOWER_BOUND + 0x20 * _chnl)
341 #define FH_TCSR_CHNL_TX_CREDIT_REG(_chnl) \
342 (FH_TCSR_LOWER_BOUND + 0x20 * _chnl + 0x4)
343 #define FH_TCSR_CHNL_TX_BUF_STS_REG(_chnl) \
344 (FH_TCSR_LOWER_BOUND + 0x20 * _chnl + 0x8)
347 * Tx Shared Status Registers (TSSR)
349 * After stopping Tx DMA channel (writing 0 to
350 * FH_TCSR_CHNL_TX_CONFIG_REG(chnl)), driver must poll
351 * FH_TSSR_TX_STATUS_REG until selected Tx channel is idle
352 * (channel's buffers empty | no pending requests).
355 * 31-24: 1 = Channel buffers empty (channel 7:0)
356 * 23-16: 1 = No pending requests (channel 7:0)
358 #define FH_TSSR_LOWER_BOUND (FH_MEM_LOWER_BOUND + 0xEA0)
359 #define FH_TSSR_UPPER_BOUND (FH_MEM_LOWER_BOUND + 0xEC0)
361 #define FH_TSSR_TX_STATUS_REG (FH_TSSR_LOWER_BOUND + 0x010)
363 #define FH_TSSR_TX_STATUS_REG_BIT_BUFS_EMPTY(_chnl) ((1 << (_chnl)) << 24)
364 #define FH_TSSR_TX_STATUS_REG_BIT_NO_PEND_REQ(_chnl) ((1 << (_chnl)) << 16)
366 #define FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(_chnl) \
367 (FH_TSSR_TX_STATUS_REG_BIT_BUFS_EMPTY(_chnl) | \
368 FH_TSSR_TX_STATUS_REG_BIT_NO_PEND_REQ(_chnl))
372 #define FH_REGS_LOWER_BOUND (0x1000)
373 #define FH_REGS_UPPER_BOUND (0x2000)
375 /* Tx service channels */
376 #define FH_SRVC_CHNL (9)
377 #define FH_SRVC_LOWER_BOUND (FH_REGS_LOWER_BOUND + 0x9C8)
378 #define FH_SRVC_UPPER_BOUND (FH_REGS_LOWER_BOUND + 0x9D0)
379 #define FH_SRVC_CHNL_SRAM_ADDR_REG(_chnl) \
380 (FH_SRVC_LOWER_BOUND + ((_chnl) - 9) * 0x4)
382 /* TFDB Area - TFDs buffer table */
383 #define FH_MEM_TFDIB_DRAM_ADDR_LSB_MSK (0xFFFFFFFF)
384 #define FH_TFDIB_LOWER_BOUND (FH_REGS_LOWER_BOUND + 0x900)
385 #define FH_TFDIB_UPPER_BOUND (FH_REGS_LOWER_BOUND + 0x958)
386 #define FH_TFDIB_CTRL0_REG(_chnl) (FH_TFDIB_LOWER_BOUND + 0x8 * (_chnl))
387 #define FH_TFDIB_CTRL1_REG(_chnl) (FH_TFDIB_LOWER_BOUND + 0x8 * (_chnl) + 0x4)
389 /* TCSR: tx_config register values */
390 #define FH_RSCSR_FRAME_SIZE_MSK (0x00003FFF) /* bits 0-13 */