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82c29810 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 2 | /* |
a1aa8822 | 3 | * ks8842.c timberdale KS8842 ethernet driver |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 4 | * Copyright (c) 2009 Intel Corporation |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5 R |
5 | */ |
6 | ||
7 | /* Supports: | |
8 | * The Micrel KS8842 behind the timberdale FPGA | |
28bd620c | 9 | * The genuine Micrel KS8841/42 device with ISA 16/32bit bus interface |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
10 | */ |
11 | ||
0dc7d2b3 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
a6b7a407 | 14 | #include <linux/interrupt.h> |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5 R |
15 | #include <linux/kernel.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/netdevice.h> | |
19 | #include <linux/etherdevice.h> | |
20 | #include <linux/ethtool.h> | |
a1aa8822 | 21 | #include <linux/ks8842.h> |
94fe8c68 RR |
22 | #include <linux/dmaengine.h> |
23 | #include <linux/dma-mapping.h> | |
24 | #include <linux/scatterlist.h> | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5 R |
25 | |
26 | #define DRV_NAME "ks8842" | |
27 | ||
28 | /* Timberdale specific Registers */ | |
db5824dd RR |
29 | #define REG_TIMB_RST 0x1c |
30 | #define REG_TIMB_FIFO 0x20 | |
31 | #define REG_TIMB_ISR 0x24 | |
32 | #define REG_TIMB_IER 0x28 | |
33 | #define REG_TIMB_IAR 0x2C | |
34 | #define REQ_TIMB_DMA_RESUME 0x30 | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="42">b07878e5 R |
35 | |
36 | /* KS8842 registers */ | |
37 | ||
38 | #define REG_SELECT_BANK 0x0e | |
39 | ||
40 | /* bank 0 registers */ | |
41 | #define REG_QRFCR 0x04 | |
42 | ||
43 | /* bank 2 registers */ | |
44 | #define REG_MARL 0x00 | |
45 | #define REG_MARM 0x02 | |
46 | #define REG_MARH 0x04 | |
47 | ||
48 | /* bank 3 registers */ | |
49 | #define REG_GRR 0x06 | |
50 | ||
51 | /* bank 16 registers */ | |
52 | #define REG_TXCR 0x00 | |
53 | #define REG_TXSR 0x02 | |
54 | #define REG_RXCR 0x04 | |
55 | #define REG_TXMIR 0x08 | |
56 | #define REG_RXMIR 0x0A | |
57 | ||
58 | /* bank 17 registers */ | |
59 | #define REG_TXQCR 0x00 | |
60 | #define REG_RXQCR 0x02 | |
61 | #define REG_TXFDPR 0x04 | |
62 | #define REG_RXFDPR 0x06 | |
63 | #define REG_QMU_DATA_LO 0x08 | |
64 | #define REG_QMU_DATA_HI 0x0A | |
65 | ||
66 | /* bank 18 registers */ | |
67 | #define REG_IER 0x00 | |
68 | #define IRQ_LINK_CHANGE 0x8000 | |
69 | #define IRQ_TX 0x4000 | |
70 | #define IRQ_RX 0x2000 | |
71 | #define IRQ_RX_OVERRUN 0x0800 | |
72 | #define IRQ_TX_STOPPED 0x0200 | |
73 | #define IRQ_RX_STOPPED 0x0100 | |
74 | #define IRQ_RX_ERROR 0x0080 | |
75 | #define ENABLED_IRQS (IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \ | |
76 | IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR) | |
94fe8c68 RR |
77 | /* When running via timberdale in DMA mode, the RX interrupt should be |
78 | enabled in the KS8842, but not in the FPGA IP, since the IP handles | |
79 | RX DMA internally. | |
80 | TX interrupts are not needed it is handled by the FPGA the driver is | |
81 | notified via DMA callbacks. | |
82 | */ | |
83 | #define ENABLED_IRQS_DMA_IP (IRQ_LINK_CHANGE | IRQ_RX_STOPPED | \ | |
84 | IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR) | |
85 | #define ENABLED_IRQS_DMA (ENABLED_IRQS_DMA_IP | IRQ_RX) | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="38">b07878e5 R |
86 | #define REG_ISR 0x02 |
87 | #define REG_RXSR 0x04 | |
88 | #define RXSR_VALID 0x8000 | |
89 | #define RXSR_BROADCAST 0x80 | |
90 | #define RXSR_MULTICAST 0x40 | |
91 | #define RXSR_UNICAST 0x20 | |
92 | #define RXSR_FRAMETYPE 0x08 | |
93 | #define RXSR_TOO_LONG 0x04 | |
94 | #define RXSR_RUNT 0x02 | |
95 | #define RXSR_CRC_ERROR 0x01 | |
96 | #define RXSR_ERROR (RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR) | |
97 | ||
98 | /* bank 32 registers */ | |
99 | #define REG_SW_ID_AND_ENABLE 0x00 | |
100 | #define REG_SGCR1 0x02 | |
101 | #define REG_SGCR2 0x04 | |
102 | #define REG_SGCR3 0x06 | |
103 | ||
104 | /* bank 39 registers */ | |
105 | #define REG_MACAR1 0x00 | |
106 | #define REG_MACAR2 0x02 | |
107 | #define REG_MACAR3 0x04 | |
108 | ||
109 | /* bank 45 registers */ | |
110 | #define REG_P1MBCR 0x00 | |
111 | #define REG_P1MBSR 0x02 | |
112 | ||
113 | /* bank 46 registers */ | |
114 | #define REG_P2MBCR 0x00 | |
115 | #define REG_P2MBSR 0x02 | |
116 | ||
117 | /* bank 48 registers */ | |
118 | #define REG_P1CR2 0x02 | |
119 | ||
120 | /* bank 49 registers */ | |
121 | #define REG_P1CR4 0x02 | |
122 | #define REG_P1SR 0x04 | |
123 | ||
28bd620c DC |
124 | /* flags passed by platform_device for configuration */ |
125 | #define MICREL_KS884X 0x01 /* 0=Timeberdale(FPGA), 1=Micrel */ | |
126 | #define KS884X_16BIT 0x02 /* 1=16bit, 0=32bit */ | |
127 | ||
94fe8c68 RR |
128 | #define DMA_BUFFER_SIZE 2048 |
129 | ||
130 | struct ks8842_tx_dma_ctl { | |
131 | struct dma_chan *chan; | |
132 | struct dma_async_tx_descriptor *adesc; | |
133 | void *buf; | |
134 | struct scatterlist sg; | |
135 | int channel; | |
136 | }; | |
137 | ||
138 | struct ks8842_rx_dma_ctl { | |
139 | struct dma_chan *chan; | |
140 | struct dma_async_tx_descriptor *adesc; | |
141 | struct sk_buff *skb; | |
142 | struct scatterlist sg; | |
143 | struct tasklet_struct tasklet; | |
144 | int channel; | |
145 | }; | |
146 | ||
147 | #define KS8842_USE_DMA(adapter) (((adapter)->dma_tx.channel != -1) && \ | |
148 | ((adapter)->dma_rx.channel != -1)) | |
149 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
150 | struct ks8842_adapter { |
151 | void __iomem *hw_addr; | |
152 | int irq; | |
28bd620c | 153 | unsigned long conf_flags; /* copy of platform_device config */ |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
154 | struct tasklet_struct tasklet; |
155 | spinlock_t lock; /* spinlock to be interrupt safe */ | |
cc88e450 RR |
156 | struct work_struct timeout_work; |
157 | struct net_device *netdev; | |
94fe8c68 RR |
158 | struct device *dev; |
159 | struct ks8842_tx_dma_ctl dma_tx; | |
160 | struct ks8842_rx_dma_ctl dma_rx; | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
161 | }; |
162 | ||
94fe8c68 RR |
163 | static void ks8842_dma_rx_cb(void *data); |
164 | static void ks8842_dma_tx_cb(void *data); | |
165 | ||
166 | static inline void ks8842_resume_dma(struct ks8842_adapter *adapter) | |
167 | { | |
168 | iowrite32(1, adapter->hw_addr + REQ_TIMB_DMA_RESUME); | |
169 | } | |
170 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="69">b07878e5 R |
171 | static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank) |
172 | { | |
173 | iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK); | |
174 | } | |
175 | ||
176 | static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank, | |
177 | u8 value, int offset) | |
178 | { | |
179 | ks8842_select_bank(adapter, bank); | |
180 | iowrite8(value, adapter->hw_addr + offset); | |
181 | } | |
182 | ||
183 | static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank, | |
184 | u16 value, int offset) | |
185 | { | |
186 | ks8842_select_bank(adapter, bank); | |
187 | iowrite16(value, adapter->hw_addr + offset); | |
188 | } | |
189 | ||
190 | static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank, | |
191 | u16 bits, int offset) | |
192 | { | |
193 | u16 reg; | |
194 | ks8842_select_bank(adapter, bank); | |
195 | reg = ioread16(adapter->hw_addr + offset); | |
196 | reg |= bits; | |
197 | iowrite16(reg, adapter->hw_addr + offset); | |
198 | } | |
199 | ||
200 | static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank, | |
201 | u16 bits, int offset) | |
202 | { | |
203 | u16 reg; | |
204 | ks8842_select_bank(adapter, bank); | |
205 | reg = ioread16(adapter->hw_addr + offset); | |
206 | reg &= ~bits; | |
207 | iowrite16(reg, adapter->hw_addr + offset); | |
208 | } | |
209 | ||
210 | static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank, | |
211 | u32 value, int offset) | |
212 | { | |
213 | ks8842_select_bank(adapter, bank); | |
214 | iowrite32(value, adapter->hw_addr + offset); | |
215 | } | |
216 | ||
217 | static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank, | |
218 | int offset) | |
219 | { | |
220 | ks8842_select_bank(adapter, bank); | |
221 | return ioread8(adapter->hw_addr + offset); | |
222 | } | |
223 | ||
224 | static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank, | |
225 | int offset) | |
226 | { | |
227 | ks8842_select_bank(adapter, bank); | |
228 | return ioread16(adapter->hw_addr + offset); | |
229 | } | |
230 | ||
231 | static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank, | |
232 | int offset) | |
233 | { | |
234 | ks8842_select_bank(adapter, bank); | |
235 | return ioread32(adapter->hw_addr + offset); | |
236 | } | |
237 | ||
238 | static void ks8842_reset(struct ks8842_adapter *adapter) | |
239 | { | |
28bd620c DC |
240 | if (adapter->conf_flags & MICREL_KS884X) { |
241 | ks8842_write16(adapter, 3, 1, REG_GRR); | |
242 | msleep(10); | |
243 | iowrite16(0, adapter->hw_addr + REG_GRR); | |
244 | } else { | |
245 | /* The KS8842 goes haywire when doing softare reset | |
246 | * a work around in the timberdale IP is implemented to | |
247 | * do a hardware reset instead | |
248 | ks8842_write16(adapter, 3, 1, REG_GRR); | |
249 | msleep(10); | |
250 | iowrite16(0, adapter->hw_addr + REG_GRR); | |
251 | */ | |
252 | iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST); | |
253 | msleep(20); | |
254 | } | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="57">b07878e5 R |
255 | } |
256 | ||
257 | static void ks8842_update_link_status(struct net_device *netdev, | |
258 | struct ks8842_adapter *adapter) | |
259 | { | |
260 | /* check the status of the link */ | |
261 | if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) { | |
262 | netif_carrier_on(netdev); | |
263 | netif_wake_queue(netdev); | |
264 | } else { | |
265 | netif_stop_queue(netdev); | |
266 | netif_carrier_off(netdev); | |
267 | } | |
268 | } | |
269 | ||
270 | static void ks8842_enable_tx(struct ks8842_adapter *adapter) | |
271 | { | |
272 | ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR); | |
273 | } | |
274 | ||
275 | static void ks8842_disable_tx(struct ks8842_adapter *adapter) | |
276 | { | |
277 | ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR); | |
278 | } | |
279 | ||
280 | static void ks8842_enable_rx(struct ks8842_adapter *adapter) | |
281 | { | |
282 | ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR); | |
283 | } | |
284 | ||
285 | static void ks8842_disable_rx(struct ks8842_adapter *adapter) | |
286 | { | |
287 | ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR); | |
288 | } | |
289 | ||
290 | static void ks8842_reset_hw(struct ks8842_adapter *adapter) | |
291 | { | |
292 | /* reset the HW */ | |
293 | ks8842_reset(adapter); | |
294 | ||
295 | /* Enable QMU Transmit flow control / transmit padding / Transmit CRC */ | |
296 | ks8842_write16(adapter, 16, 0x000E, REG_TXCR); | |
297 | ||
298 | /* enable the receiver, uni + multi + broadcast + flow ctrl | |
299 | + crc strip */ | |
300 | ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400, | |
301 | REG_RXCR); | |
302 | ||
303 | /* TX frame pointer autoincrement */ | |
304 | ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR); | |
305 | ||
306 | /* RX frame pointer autoincrement */ | |
307 | ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR); | |
308 | ||
309 | /* RX 2 kb high watermark */ | |
310 | ks8842_write16(adapter, 0, 0x1000, REG_QRFCR); | |
311 | ||
25985edc | 312 | /* aggressive back off in half duplex */ |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="10">b07878e5 R |
313 | ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1); |
314 | ||
315 | /* enable no excessive collison drop */ | |
316 | ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2); | |
317 | ||
318 | /* Enable port 1 force flow control / back pressure / transmit / recv */ | |
319 | ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2); | |
320 | ||
321 | /* restart port auto-negotiation */ | |
322 | ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4); | |
28bd620c | 323 | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="10">b07878e5 R |
324 | /* Enable the transmitter */ |
325 | ks8842_enable_tx(adapter); | |
326 | ||
327 | /* Enable the receiver */ | |
328 | ks8842_enable_rx(adapter); | |
329 | ||
330 | /* clear all interrupts */ | |
331 | ks8842_write16(adapter, 18, 0xffff, REG_ISR); | |
332 | ||
333 | /* enable interrupts */ | |
94fe8c68 RR |
334 | if (KS8842_USE_DMA(adapter)) { |
335 | /* When running in DMA Mode the RX interrupt is not enabled in | |
336 | timberdale because RX data is received by DMA callbacks | |
337 | it must still be enabled in the KS8842 because it indicates | |
338 | to timberdale when there is RX data for it's DMA FIFOs */ | |
339 | iowrite16(ENABLED_IRQS_DMA_IP, adapter->hw_addr + REG_TIMB_IER); | |
340 | ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER); | |
341 | } else { | |
342 | if (!(adapter->conf_flags & MICREL_KS884X)) | |
343 | iowrite16(ENABLED_IRQS, | |
344 | adapter->hw_addr + REG_TIMB_IER); | |
345 | ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER); | |
346 | } | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="12">b07878e5 R |
347 | /* enable the switch */ |
348 | ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE); | |
349 | } | |
350 | ||
351 | static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest) | |
352 | { | |
353 | int i; | |
354 | u16 mac; | |
355 | ||
356 | for (i = 0; i < ETH_ALEN; i++) | |
357 | dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i); | |
358 | ||
28bd620c DC |
359 | if (adapter->conf_flags & MICREL_KS884X) { |
360 | /* | |
361 | the sequence of saving mac addr between MAC and Switch is | |
362 | different. | |
363 | */ | |
364 | ||
365 | mac = ks8842_read16(adapter, 2, REG_MARL); | |
366 | ks8842_write16(adapter, 39, mac, REG_MACAR3); | |
367 | mac = ks8842_read16(adapter, 2, REG_MARM); | |
368 | ks8842_write16(adapter, 39, mac, REG_MACAR2); | |
369 | mac = ks8842_read16(adapter, 2, REG_MARH); | |
370 | ks8842_write16(adapter, 39, mac, REG_MACAR1); | |
371 | } else { | |
372 | ||
373 | /* make sure the switch port uses the same MAC as the QMU */ | |
374 | mac = ks8842_read16(adapter, 2, REG_MARL); | |
375 | ks8842_write16(adapter, 39, mac, REG_MACAR1); | |
376 | mac = ks8842_read16(adapter, 2, REG_MARM); | |
377 | ks8842_write16(adapter, 39, mac, REG_MACAR2); | |
378 | mac = ks8842_read16(adapter, 2, REG_MARH); | |
379 | ks8842_write16(adapter, 39, mac, REG_MACAR3); | |
380 | } | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
381 | } |
382 | ||
a1aa8822 RR |
383 | static void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac) |
384 | { | |
385 | unsigned long flags; | |
386 | unsigned i; | |
387 | ||
388 | spin_lock_irqsave(&adapter->lock, flags); | |
389 | for (i = 0; i < ETH_ALEN; i++) { | |
390 | ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i); | |
28bd620c DC |
391 | if (!(adapter->conf_flags & MICREL_KS884X)) |
392 | ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1], | |
393 | REG_MACAR1 + i); | |
394 | } | |
395 | ||
396 | if (adapter->conf_flags & MICREL_KS884X) { | |
397 | /* | |
398 | the sequence of saving mac addr between MAC and Switch is | |
399 | different. | |
400 | */ | |
401 | ||
402 | u16 mac; | |
403 | ||
404 | mac = ks8842_read16(adapter, 2, REG_MARL); | |
405 | ks8842_write16(adapter, 39, mac, REG_MACAR3); | |
406 | mac = ks8842_read16(adapter, 2, REG_MARM); | |
407 | ks8842_write16(adapter, 39, mac, REG_MACAR2); | |
408 | mac = ks8842_read16(adapter, 2, REG_MARH); | |
409 | ks8842_write16(adapter, 39, mac, REG_MACAR1); | |
a1aa8822 RR |
410 | } |
411 | spin_unlock_irqrestore(&adapter->lock, flags); | |
412 | } | |
413 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="5">b07878e5 R |
414 | static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter) |
415 | { | |
416 | return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff; | |
417 | } | |
418 | ||
94fe8c68 RR |
419 | static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev) |
420 | { | |
421 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
422 | struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx; | |
423 | u8 *buf = ctl->buf; | |
424 | ||
425 | if (ctl->adesc) { | |
426 | netdev_dbg(netdev, "%s: TX ongoing\n", __func__); | |
427 | /* transfer ongoing */ | |
428 | return NETDEV_TX_BUSY; | |
429 | } | |
430 | ||
431 | sg_dma_len(&ctl->sg) = skb->len + sizeof(u32); | |
432 | ||
433 | /* copy data to the TX buffer */ | |
434 | /* the control word, enable IRQ, port 1 and the length */ | |
435 | *buf++ = 0x00; | |
436 | *buf++ = 0x01; /* Port 1 */ | |
437 | *buf++ = skb->len & 0xff; | |
438 | *buf++ = (skb->len >> 8) & 0xff; | |
439 | skb_copy_from_linear_data(skb, buf, skb->len); | |
440 | ||
441 | dma_sync_single_range_for_device(adapter->dev, | |
442 | sg_dma_address(&ctl->sg), 0, sg_dma_len(&ctl->sg), | |
443 | DMA_TO_DEVICE); | |
444 | ||
445 | /* make sure the length is a multiple of 4 */ | |
446 | if (sg_dma_len(&ctl->sg) % 4) | |
447 | sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4; | |
448 | ||
16052827 | 449 | ctl->adesc = dmaengine_prep_slave_sg(ctl->chan, |
0776ae7b | 450 | &ctl->sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); |
94fe8c68 RR |
451 | if (!ctl->adesc) |
452 | return NETDEV_TX_BUSY; | |
453 | ||
454 | ctl->adesc->callback_param = netdev; | |
455 | ctl->adesc->callback = ks8842_dma_tx_cb; | |
456 | ctl->adesc->tx_submit(ctl->adesc); | |
457 | ||
458 | netdev->stats.tx_bytes += skb->len; | |
459 | ||
460 | dev_kfree_skb(skb); | |
461 | ||
462 | return NETDEV_TX_OK; | |
463 | } | |
464 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5 R |
465 | static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev) |
466 | { | |
467 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
468 | int len = skb->len; | |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 469 | |
a99db196 | 470 | netdev_dbg(netdev, "%s: len %u head %p data %p tail %p end %p\n", |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="7">b07878e5 R |
471 | __func__, skb->len, skb->head, skb->data, |
472 | skb_tail_pointer(skb), skb_end_pointer(skb)); | |
473 | ||
474 | /* check FIFO buffer space, we need space for CRC and command bits */ | |
475 | if (ks8842_tx_fifo_space(adapter) < len + 8) | |
476 | return NETDEV_TX_BUSY; | |
477 | ||
28bd620c DC |
478 | if (adapter->conf_flags & KS884X_16BIT) { |
479 | u16 *ptr16 = (u16 *)skb->data; | |
480 | ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO); | |
481 | ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI); | |
482 | netdev->stats.tx_bytes += len; | |
483 | ||
484 | /* copy buffer */ | |
485 | while (len > 0) { | |
486 | iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO); | |
487 | iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI); | |
488 | len -= sizeof(u32); | |
489 | } | |
490 | } else { | |
491 | ||
492 | u32 *ptr = (u32 *)skb->data; | |
493 | u32 ctrl; | |
494 | /* the control word, enable IRQ, port 1 and the length */ | |
495 | ctrl = 0x8000 | 0x100 | (len << 16); | |
496 | ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO); | |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 497 | |
28bd620c | 498 | netdev->stats.tx_bytes += len; |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 499 | |
28bd620c DC |
500 | /* copy buffer */ |
501 | while (len > 0) { | |
502 | iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO); | |
503 | len -= sizeof(u32); | |
504 | ptr++; | |
505 | } | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="10">b07878e5 R |
506 | } |
507 | ||
508 | /* enqueue packet */ | |
509 | ks8842_write16(adapter, 17, 1, REG_TXQCR); | |
510 | ||
511 | dev_kfree_skb(skb); | |
512 | ||
513 | return NETDEV_TX_OK; | |
514 | } | |
515 | ||
94fe8c68 RR |
516 | static void ks8842_update_rx_err_counters(struct net_device *netdev, u32 status) |
517 | { | |
518 | netdev_dbg(netdev, "RX error, status: %x\n", status); | |
519 | ||
520 | netdev->stats.rx_errors++; | |
521 | if (status & RXSR_TOO_LONG) | |
522 | netdev->stats.rx_length_errors++; | |
523 | if (status & RXSR_CRC_ERROR) | |
524 | netdev->stats.rx_crc_errors++; | |
525 | if (status & RXSR_RUNT) | |
526 | netdev->stats.rx_frame_errors++; | |
527 | } | |
528 | ||
529 | static void ks8842_update_rx_counters(struct net_device *netdev, u32 status, | |
530 | int len) | |
531 | { | |
532 | netdev_dbg(netdev, "RX packet, len: %d\n", len); | |
533 | ||
534 | netdev->stats.rx_packets++; | |
535 | netdev->stats.rx_bytes += len; | |
536 | if (status & RXSR_MULTICAST) | |
537 | netdev->stats.multicast++; | |
538 | } | |
539 | ||
540 | static int __ks8842_start_new_rx_dma(struct net_device *netdev) | |
541 | { | |
542 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
543 | struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx; | |
544 | struct scatterlist *sg = &ctl->sg; | |
545 | int err; | |
546 | ||
547 | ctl->skb = netdev_alloc_skb(netdev, DMA_BUFFER_SIZE); | |
548 | if (ctl->skb) { | |
549 | sg_init_table(sg, 1); | |
550 | sg_dma_address(sg) = dma_map_single(adapter->dev, | |
551 | ctl->skb->data, DMA_BUFFER_SIZE, DMA_FROM_DEVICE); | |
3af0d554 DC |
552 | if (dma_mapping_error(adapter->dev, sg_dma_address(sg))) { |
553 | err = -ENOMEM; | |
94fe8c68 RR |
554 | sg_dma_address(sg) = 0; |
555 | goto out; | |
556 | } | |
557 | ||
558 | sg_dma_len(sg) = DMA_BUFFER_SIZE; | |
559 | ||
16052827 | 560 | ctl->adesc = dmaengine_prep_slave_sg(ctl->chan, |
0776ae7b | 561 | sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); |
94fe8c68 | 562 | |
3af0d554 DC |
563 | if (!ctl->adesc) { |
564 | err = -ENOMEM; | |
94fe8c68 | 565 | goto out; |
3af0d554 | 566 | } |
94fe8c68 RR |
567 | |
568 | ctl->adesc->callback_param = netdev; | |
569 | ctl->adesc->callback = ks8842_dma_rx_cb; | |
570 | ctl->adesc->tx_submit(ctl->adesc); | |
571 | } else { | |
572 | err = -ENOMEM; | |
573 | sg_dma_address(sg) = 0; | |
574 | goto out; | |
575 | } | |
576 | ||
3af0d554 | 577 | return 0; |
94fe8c68 RR |
578 | out: |
579 | if (sg_dma_address(sg)) | |
580 | dma_unmap_single(adapter->dev, sg_dma_address(sg), | |
581 | DMA_BUFFER_SIZE, DMA_FROM_DEVICE); | |
582 | sg_dma_address(sg) = 0; | |
583 | if (ctl->skb) | |
584 | dev_kfree_skb(ctl->skb); | |
585 | ||
586 | ctl->skb = NULL; | |
587 | ||
588 | printk(KERN_ERR DRV_NAME": Failed to start RX DMA: %d\n", err); | |
589 | return err; | |
590 | } | |
591 | ||
592 | static void ks8842_rx_frame_dma_tasklet(unsigned long arg) | |
593 | { | |
594 | struct net_device *netdev = (struct net_device *)arg; | |
595 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
596 | struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx; | |
597 | struct sk_buff *skb = ctl->skb; | |
598 | dma_addr_t addr = sg_dma_address(&ctl->sg); | |
599 | u32 status; | |
600 | ||
601 | ctl->adesc = NULL; | |
602 | ||
603 | /* kick next transfer going */ | |
604 | __ks8842_start_new_rx_dma(netdev); | |
605 | ||
606 | /* now handle the data we got */ | |
607 | dma_unmap_single(adapter->dev, addr, DMA_BUFFER_SIZE, DMA_FROM_DEVICE); | |
608 | ||
609 | status = *((u32 *)skb->data); | |
610 | ||
611 | netdev_dbg(netdev, "%s - rx_data: status: %x\n", | |
612 | __func__, status & 0xffff); | |
613 | ||
614 | /* check the status */ | |
615 | if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) { | |
616 | int len = (status >> 16) & 0x7ff; | |
617 | ||
618 | ks8842_update_rx_counters(netdev, status, len); | |
619 | ||
620 | /* reserve 4 bytes which is the status word */ | |
621 | skb_reserve(skb, 4); | |
622 | skb_put(skb, len); | |
623 | ||
624 | skb->protocol = eth_type_trans(skb, netdev); | |
625 | netif_rx(skb); | |
626 | } else { | |
627 | ks8842_update_rx_err_counters(netdev, status); | |
628 | dev_kfree_skb(skb); | |
629 | } | |
630 | } | |
631 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
632 | static void ks8842_rx_frame(struct net_device *netdev, |
633 | struct ks8842_adapter *adapter) | |
634 | { | |
28bd620c DC |
635 | u32 status; |
636 | int len; | |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 637 | |
28bd620c | 638 | if (adapter->conf_flags & KS884X_16BIT) { |
e2df8b7f DM |
639 | status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO); |
640 | len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI); | |
28bd620c | 641 | netdev_dbg(netdev, "%s - rx_data: status: %x\n", |
e2df8b7f | 642 | __func__, status); |
28bd620c DC |
643 | } else { |
644 | status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO); | |
645 | len = (status >> 16) & 0x7ff; | |
646 | status &= 0xffff; | |
647 | netdev_dbg(netdev, "%s - rx_data: status: %x\n", | |
648 | __func__, status); | |
649 | } | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
650 | |
651 | /* check the status */ | |
652 | if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) { | |
b10cec8a | 653 | struct sk_buff *skb = netdev_alloc_skb_ip_align(netdev, len + 3); |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 654 | |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 655 | if (skb) { |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 656 | |
94fe8c68 | 657 | ks8842_update_rx_counters(netdev, status, len); |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 658 | |
28bd620c | 659 | if (adapter->conf_flags & KS884X_16BIT) { |
4df864c1 | 660 | u16 *data16 = skb_put(skb, len); |
28bd620c DC |
661 | ks8842_select_bank(adapter, 17); |
662 | while (len > 0) { | |
663 | *data16++ = ioread16(adapter->hw_addr + | |
664 | REG_QMU_DATA_LO); | |
665 | *data16++ = ioread16(adapter->hw_addr + | |
666 | REG_QMU_DATA_HI); | |
667 | len -= sizeof(u32); | |
668 | } | |
669 | } else { | |
4df864c1 | 670 | u32 *data = skb_put(skb, len); |
28bd620c DC |
671 | |
672 | ks8842_select_bank(adapter, 17); | |
673 | while (len > 0) { | |
674 | *data++ = ioread32(adapter->hw_addr + | |
675 | REG_QMU_DATA_LO); | |
676 | len -= sizeof(u32); | |
677 | } | |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 678 | } |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5 R |
679 | skb->protocol = eth_type_trans(skb, netdev); |
680 | netif_rx(skb); | |
681 | } else | |
682 | netdev->stats.rx_dropped++; | |
94fe8c68 RR |
683 | } else |
684 | ks8842_update_rx_err_counters(netdev, status); | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="11">b07878e5 R |
685 | |
686 | /* set high watermark to 3K */ | |
687 | ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR); | |
688 | ||
689 | /* release the frame */ | |
690 | ks8842_write16(adapter, 17, 0x01, REG_RXQCR); | |
691 | ||
692 | /* set high watermark to 2K */ | |
693 | ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR); | |
694 | } | |
695 | ||
51a700db JH |
696 | static void ks8842_handle_rx(struct net_device *netdev, |
697 | struct ks8842_adapter *adapter) | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
698 | { |
699 | u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff; | |
a99db196 | 700 | netdev_dbg(netdev, "%s Entry - rx_data: %d\n", __func__, rx_data); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5 R |
701 | while (rx_data) { |
702 | ks8842_rx_frame(netdev, adapter); | |
703 | rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff; | |
704 | } | |
705 | } | |
706 | ||
51a700db JH |
707 | static void ks8842_handle_tx(struct net_device *netdev, |
708 | struct ks8842_adapter *adapter) | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
709 | { |
710 | u16 sr = ks8842_read16(adapter, 16, REG_TXSR); | |
a99db196 | 711 | netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="5">b07878e5 R |
712 | netdev->stats.tx_packets++; |
713 | if (netif_queue_stopped(netdev)) | |
714 | netif_wake_queue(netdev); | |
715 | } | |
716 | ||
51a700db | 717 | static void ks8842_handle_rx_overrun(struct net_device *netdev, |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
718 | struct ks8842_adapter *adapter) |
719 | { | |
a99db196 | 720 | netdev_dbg(netdev, "%s: entry\n", __func__); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5 R |
721 | netdev->stats.rx_errors++; |
722 | netdev->stats.rx_fifo_errors++; | |
723 | } | |
724 | ||
51a700db | 725 | static void ks8842_tasklet(unsigned long arg) |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="13">b07878e5 R |
726 | { |
727 | struct net_device *netdev = (struct net_device *)arg; | |
728 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
729 | u16 isr; | |
730 | unsigned long flags; | |
731 | u16 entry_bank; | |
732 | ||
733 | /* read current bank to be able to set it back */ | |
734 | spin_lock_irqsave(&adapter->lock, flags); | |
735 | entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK); | |
736 | spin_unlock_irqrestore(&adapter->lock, flags); | |
737 | ||
738 | isr = ks8842_read16(adapter, 18, REG_ISR); | |
a99db196 | 739 | netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr); |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 740 | |
94fe8c68 RR |
741 | /* when running in DMA mode, do not ack RX interrupts, it is handled |
742 | internally by timberdale, otherwise it's DMA FIFO:s would stop | |
743 | */ | |
744 | if (KS8842_USE_DMA(adapter)) | |
745 | isr &= ~IRQ_RX; | |
746 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
747 | /* Ack */ |
748 | ks8842_write16(adapter, 18, isr, REG_ISR); | |
749 | ||
db5824dd RR |
750 | if (!(adapter->conf_flags & MICREL_KS884X)) |
751 | /* Ack in the timberdale IP as well */ | |
752 | iowrite32(0x1, adapter->hw_addr + REG_TIMB_IAR); | |
753 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5 R |
754 | if (!netif_running(netdev)) |
755 | return; | |
756 | ||
757 | if (isr & IRQ_LINK_CHANGE) | |
758 | ks8842_update_link_status(netdev, adapter); | |
759 | ||
94fe8c68 RR |
760 | /* should not get IRQ_RX when running DMA mode */ |
761 | if (isr & (IRQ_RX | IRQ_RX_ERROR) && !KS8842_USE_DMA(adapter)) | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
762 | ks8842_handle_rx(netdev, adapter); |
763 | ||
94fe8c68 | 764 | /* should only happen when in PIO mode */ |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="18">b07878e5 R |
765 | if (isr & IRQ_TX) |
766 | ks8842_handle_tx(netdev, adapter); | |
767 | ||
768 | if (isr & IRQ_RX_OVERRUN) | |
769 | ks8842_handle_rx_overrun(netdev, adapter); | |
770 | ||
771 | if (isr & IRQ_TX_STOPPED) { | |
772 | ks8842_disable_tx(adapter); | |
773 | ks8842_enable_tx(adapter); | |
774 | } | |
775 | ||
776 | if (isr & IRQ_RX_STOPPED) { | |
777 | ks8842_disable_rx(adapter); | |
778 | ks8842_enable_rx(adapter); | |
779 | } | |
780 | ||
781 | /* re-enable interrupts, put back the bank selection register */ | |
782 | spin_lock_irqsave(&adapter->lock, flags); | |
94fe8c68 RR |
783 | if (KS8842_USE_DMA(adapter)) |
784 | ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER); | |
785 | else | |
786 | ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER); | |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 787 | iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK); |
94fe8c68 RR |
788 | |
789 | /* Make sure timberdale continues DMA operations, they are stopped while | |
790 | we are handling the ks8842 because we might change bank */ | |
791 | if (KS8842_USE_DMA(adapter)) | |
792 | ks8842_resume_dma(adapter); | |
793 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="5">b07878e5 R |
794 | spin_unlock_irqrestore(&adapter->lock, flags); |
795 | } | |
796 | ||
797 | static irqreturn_t ks8842_irq(int irq, void *devid) | |
798 | { | |
a99db196 RR |
799 | struct net_device *netdev = devid; |
800 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="5">b07878e5 R |
801 | u16 isr; |
802 | u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK); | |
803 | irqreturn_t ret = IRQ_NONE; | |
804 | ||
805 | isr = ks8842_read16(adapter, 18, REG_ISR); | |
a99db196 | 806 | netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
807 | |
808 | if (isr) { | |
94fe8c68 RR |
809 | if (KS8842_USE_DMA(adapter)) |
810 | /* disable all but RX IRQ, since the FPGA relies on it*/ | |
811 | ks8842_write16(adapter, 18, IRQ_RX, REG_IER); | |
812 | else | |
813 | /* disable IRQ */ | |
814 | ks8842_write16(adapter, 18, 0x00, REG_IER); | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="9">b07878e5 R |
815 | |
816 | /* schedule tasklet */ | |
817 | tasklet_schedule(&adapter->tasklet); | |
818 | ||
819 | ret = IRQ_HANDLED; | |
820 | } | |
821 | ||
822 | iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK); | |
823 | ||
94fe8c68 RR |
824 | /* After an interrupt, tell timberdale to continue DMA operations. |
825 | DMA is disabled while we are handling the ks8842 because we might | |
826 | change bank */ | |
827 | ks8842_resume_dma(adapter); | |
828 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
829 | return ret; |
830 | } | |
831 | ||
94fe8c68 RR |
832 | static void ks8842_dma_rx_cb(void *data) |
833 | { | |
834 | struct net_device *netdev = data; | |
835 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
836 | ||
837 | netdev_dbg(netdev, "RX DMA finished\n"); | |
838 | /* schedule tasklet */ | |
839 | if (adapter->dma_rx.adesc) | |
840 | tasklet_schedule(&adapter->dma_rx.tasklet); | |
841 | } | |
842 | ||
843 | static void ks8842_dma_tx_cb(void *data) | |
844 | { | |
845 | struct net_device *netdev = data; | |
846 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
847 | struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx; | |
848 | ||
849 | netdev_dbg(netdev, "TX DMA finished\n"); | |
850 | ||
851 | if (!ctl->adesc) | |
852 | return; | |
853 | ||
854 | netdev->stats.tx_packets++; | |
855 | ctl->adesc = NULL; | |
856 | ||
857 | if (netif_queue_stopped(netdev)) | |
858 | netif_wake_queue(netdev); | |
859 | } | |
860 | ||
861 | static void ks8842_stop_dma(struct ks8842_adapter *adapter) | |
862 | { | |
863 | struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx; | |
864 | struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx; | |
865 | ||
866 | tx_ctl->adesc = NULL; | |
867 | if (tx_ctl->chan) | |
843d349c | 868 | dmaengine_terminate_all(tx_ctl->chan); |
94fe8c68 RR |
869 | |
870 | rx_ctl->adesc = NULL; | |
871 | if (rx_ctl->chan) | |
843d349c | 872 | dmaengine_terminate_all(rx_ctl->chan); |
94fe8c68 RR |
873 | |
874 | if (sg_dma_address(&rx_ctl->sg)) | |
875 | dma_unmap_single(adapter->dev, sg_dma_address(&rx_ctl->sg), | |
876 | DMA_BUFFER_SIZE, DMA_FROM_DEVICE); | |
877 | sg_dma_address(&rx_ctl->sg) = 0; | |
878 | ||
879 | dev_kfree_skb(rx_ctl->skb); | |
880 | rx_ctl->skb = NULL; | |
881 | } | |
882 | ||
883 | static void ks8842_dealloc_dma_bufs(struct ks8842_adapter *adapter) | |
884 | { | |
885 | struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx; | |
886 | struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx; | |
887 | ||
888 | ks8842_stop_dma(adapter); | |
889 | ||
890 | if (tx_ctl->chan) | |
891 | dma_release_channel(tx_ctl->chan); | |
892 | tx_ctl->chan = NULL; | |
893 | ||
894 | if (rx_ctl->chan) | |
895 | dma_release_channel(rx_ctl->chan); | |
896 | rx_ctl->chan = NULL; | |
897 | ||
898 | tasklet_kill(&rx_ctl->tasklet); | |
899 | ||
900 | if (sg_dma_address(&tx_ctl->sg)) | |
901 | dma_unmap_single(adapter->dev, sg_dma_address(&tx_ctl->sg), | |
902 | DMA_BUFFER_SIZE, DMA_TO_DEVICE); | |
903 | sg_dma_address(&tx_ctl->sg) = 0; | |
904 | ||
905 | kfree(tx_ctl->buf); | |
906 | tx_ctl->buf = NULL; | |
907 | } | |
908 | ||
909 | static bool ks8842_dma_filter_fn(struct dma_chan *chan, void *filter_param) | |
910 | { | |
bd280635 | 911 | return chan->chan_id == (long)filter_param; |
94fe8c68 RR |
912 | } |
913 | ||
914 | static int ks8842_alloc_dma_bufs(struct net_device *netdev) | |
915 | { | |
916 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
917 | struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx; | |
918 | struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx; | |
919 | int err; | |
920 | ||
921 | dma_cap_mask_t mask; | |
922 | ||
923 | dma_cap_zero(mask); | |
924 | dma_cap_set(DMA_SLAVE, mask); | |
925 | dma_cap_set(DMA_PRIVATE, mask); | |
926 | ||
927 | sg_init_table(&tx_ctl->sg, 1); | |
928 | ||
929 | tx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn, | |
bd280635 | 930 | (void *)(long)tx_ctl->channel); |
94fe8c68 RR |
931 | if (!tx_ctl->chan) { |
932 | err = -ENODEV; | |
933 | goto err; | |
934 | } | |
935 | ||
936 | /* allocate DMA buffer */ | |
937 | tx_ctl->buf = kmalloc(DMA_BUFFER_SIZE, GFP_KERNEL); | |
938 | if (!tx_ctl->buf) { | |
939 | err = -ENOMEM; | |
940 | goto err; | |
941 | } | |
942 | ||
943 | sg_dma_address(&tx_ctl->sg) = dma_map_single(adapter->dev, | |
944 | tx_ctl->buf, DMA_BUFFER_SIZE, DMA_TO_DEVICE); | |
2902bc66 DC |
945 | if (dma_mapping_error(adapter->dev, sg_dma_address(&tx_ctl->sg))) { |
946 | err = -ENOMEM; | |
94fe8c68 RR |
947 | sg_dma_address(&tx_ctl->sg) = 0; |
948 | goto err; | |
949 | } | |
950 | ||
951 | rx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn, | |
bd280635 | 952 | (void *)(long)rx_ctl->channel); |
94fe8c68 RR |
953 | if (!rx_ctl->chan) { |
954 | err = -ENODEV; | |
955 | goto err; | |
956 | } | |
957 | ||
958 | tasklet_init(&rx_ctl->tasklet, ks8842_rx_frame_dma_tasklet, | |
959 | (unsigned long)netdev); | |
960 | ||
961 | return 0; | |
962 | err: | |
963 | ks8842_dealloc_dma_bufs(adapter); | |
964 | return err; | |
965 | } | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="8">b07878e5 R |
966 | |
967 | /* Netdevice operations */ | |
968 | ||
969 | static int ks8842_open(struct net_device *netdev) | |
970 | { | |
971 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
972 | int err; | |
973 | ||
a99db196 | 974 | netdev_dbg(netdev, "%s - entry\n", __func__); |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 975 | |
94fe8c68 RR |
976 | if (KS8842_USE_DMA(adapter)) { |
977 | err = ks8842_alloc_dma_bufs(netdev); | |
978 | ||
979 | if (!err) { | |
980 | /* start RX dma */ | |
981 | err = __ks8842_start_new_rx_dma(netdev); | |
982 | if (err) | |
983 | ks8842_dealloc_dma_bufs(adapter); | |
984 | } | |
985 | ||
986 | if (err) { | |
987 | printk(KERN_WARNING DRV_NAME | |
988 | ": Failed to initiate DMA, running PIO\n"); | |
989 | ks8842_dealloc_dma_bufs(adapter); | |
990 | adapter->dma_rx.channel = -1; | |
991 | adapter->dma_tx.channel = -1; | |
992 | } | |
993 | } | |
994 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
995 | /* reset the HW */ |
996 | ks8842_reset_hw(adapter); | |
997 | ||
a1aa8822 RR |
998 | ks8842_write_mac_addr(adapter, netdev->dev_addr); |
999 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
1000 | ks8842_update_link_status(netdev, adapter); |
1001 | ||
1002 | err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME, | |
a99db196 | 1003 | netdev); |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 1004 | if (err) { |
0dc7d2b3 | 1005 | pr_err("Failed to request IRQ: %d: %d\n", adapter->irq, err); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="10">b07878e5 R |
1006 | return err; |
1007 | } | |
1008 | ||
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | static int ks8842_close(struct net_device *netdev) | |
1013 | { | |
1014 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
1015 | ||
a99db196 | 1016 | netdev_dbg(netdev, "%s - entry\n", __func__); |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 1017 | |
cc88e450 RR |
1018 | cancel_work_sync(&adapter->timeout_work); |
1019 | ||
94fe8c68 RR |
1020 | if (KS8842_USE_DMA(adapter)) |
1021 | ks8842_dealloc_dma_bufs(adapter); | |
1022 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 1023 | /* free the irq */ |
a99db196 | 1024 | free_irq(adapter->irq, netdev); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="7">b07878e5 R |
1025 | |
1026 | /* disable the switch */ | |
1027 | ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE); | |
1028 | ||
1029 | return 0; | |
1030 | } | |
1031 | ||
61357325 SH |
1032 | static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb, |
1033 | struct net_device *netdev) | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5 R |
1034 | { |
1035 | int ret; | |
1036 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
1037 | ||
a99db196 | 1038 | netdev_dbg(netdev, "%s: entry\n", __func__); |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 1039 | |
94fe8c68 RR |
1040 | if (KS8842_USE_DMA(adapter)) { |
1041 | unsigned long flags; | |
1042 | ret = ks8842_tx_frame_dma(skb, netdev); | |
1043 | /* for now only allow one transfer at the time */ | |
1044 | spin_lock_irqsave(&adapter->lock, flags); | |
1045 | if (adapter->dma_tx.adesc) | |
1046 | netif_stop_queue(netdev); | |
1047 | spin_unlock_irqrestore(&adapter->lock, flags); | |
1048 | return ret; | |
1049 | } | |
1050 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="11">b07878e5 R |
1051 | ret = ks8842_tx_frame(skb, netdev); |
1052 | ||
1053 | if (ks8842_tx_fifo_space(adapter) < netdev->mtu + 8) | |
1054 | netif_stop_queue(netdev); | |
1055 | ||
1056 | return ret; | |
1057 | } | |
1058 | ||
1059 | static int ks8842_set_mac(struct net_device *netdev, void *p) | |
1060 | { | |
1061 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
1062 | struct sockaddr *addr = p; |
1063 | char *mac = (u8 *)addr->sa_data; | |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 1064 | |
a99db196 | 1065 | netdev_dbg(netdev, "%s: entry\n", __func__); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5 R |
1066 | |
1067 | if (!is_valid_ether_addr(addr->sa_data)) | |
1068 | return -EADDRNOTAVAIL; | |
1069 | ||
1070 | memcpy(netdev->dev_addr, mac, netdev->addr_len); | |
1071 | ||
a1aa8822 | 1072 | ks8842_write_mac_addr(adapter, mac); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
1073 | return 0; |
1074 | } | |
1075 | ||
cc88e450 | 1076 | static void ks8842_tx_timeout_work(struct work_struct *work) |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 1077 | { |
cc88e450 RR |
1078 | struct ks8842_adapter *adapter = |
1079 | container_of(work, struct ks8842_adapter, timeout_work); | |
1080 | struct net_device *netdev = adapter->netdev; | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
1081 | unsigned long flags; |
1082 | ||
a99db196 | 1083 | netdev_dbg(netdev, "%s: entry\n", __func__); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
1084 | |
1085 | spin_lock_irqsave(&adapter->lock, flags); | |
94fe8c68 RR |
1086 | |
1087 | if (KS8842_USE_DMA(adapter)) | |
1088 | ks8842_stop_dma(adapter); | |
1089 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
1090 | /* disable interrupts */ |
1091 | ks8842_write16(adapter, 18, 0, REG_IER); | |
1092 | ks8842_write16(adapter, 18, 0xFFFF, REG_ISR); | |
cc88e450 RR |
1093 | |
1094 | netif_stop_queue(netdev); | |
1095 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="4">b07878e5 R |
1096 | spin_unlock_irqrestore(&adapter->lock, flags); |
1097 | ||
1098 | ks8842_reset_hw(adapter); | |
1099 | ||
a1aa8822 RR |
1100 | ks8842_write_mac_addr(adapter, netdev->dev_addr); |
1101 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 1102 | ks8842_update_link_status(netdev, adapter); |
94fe8c68 RR |
1103 | |
1104 | if (KS8842_USE_DMA(adapter)) | |
1105 | __ks8842_start_new_rx_dma(netdev); | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
1106 | } |
1107 | ||
cc88e450 RR |
1108 | static void ks8842_tx_timeout(struct net_device *netdev) |
1109 | { | |
1110 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
1111 | ||
1112 | netdev_dbg(netdev, "%s: entry\n", __func__); | |
1113 | ||
1114 | schedule_work(&adapter->timeout_work); | |
1115 | } | |
1116 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="9">b07878e5 R |
1117 | static const struct net_device_ops ks8842_netdev_ops = { |
1118 | .ndo_open = ks8842_open, | |
1119 | .ndo_stop = ks8842_close, | |
1120 | .ndo_start_xmit = ks8842_xmit_frame, | |
1121 | .ndo_set_mac_address = ks8842_set_mac, | |
1122 | .ndo_tx_timeout = ks8842_tx_timeout, | |
1123 | .ndo_validate_addr = eth_validate_addr | |
1124 | }; | |
1125 | ||
0fc0b732 | 1126 | static const struct ethtool_ops ks8842_ethtool_ops = { |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="3">b07878e5 R |
1127 | .get_link = ethtool_op_get_link, |
1128 | }; | |
1129 | ||
654b8c5c | 1130 | static int ks8842_probe(struct platform_device *pdev) |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="5">b07878e5 R |
1131 | { |
1132 | int err = -ENOMEM; | |
1133 | struct resource *iomem; | |
1134 | struct net_device *netdev; | |
1135 | struct ks8842_adapter *adapter; | |
0dd14b67 | 1136 | struct ks8842_platform_data *pdata = dev_get_platdata(&pdev->dev); |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 1137 | u16 id; |
a1aa8822 | 1138 | unsigned i; |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="12">b07878e5 R |
1139 | |
1140 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1141 | if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME)) | |
1142 | goto err_mem_region; | |
1143 | ||
1144 | netdev = alloc_etherdev(sizeof(struct ks8842_adapter)); | |
1145 | if (!netdev) | |
1146 | goto err_alloc_etherdev; | |
1147 | ||
1148 | SET_NETDEV_DEV(netdev, &pdev->dev); | |
1149 | ||
1150 | adapter = netdev_priv(netdev); | |
cc88e450 RR |
1151 | adapter->netdev = netdev; |
1152 | INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work); | |
\9aöjfors, 2009-06-04 03:35:55 +0000">b07878e5 | 1153 | adapter->hw_addr = ioremap(iomem->start, resource_size(iomem)); |
28bd620c DC |
1154 | adapter->conf_flags = iomem->flags; |
1155 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="9">b07878e5 R |
1156 | if (!adapter->hw_addr) |
1157 | goto err_ioremap; | |
1158 | ||
1159 | adapter->irq = platform_get_irq(pdev, 0); | |
1160 | if (adapter->irq < 0) { | |
1161 | err = adapter->irq; | |
1162 | goto err_get_irq; | |
1163 | } | |
1164 | ||
94fe8c68 RR |
1165 | adapter->dev = (pdev->dev.parent) ? pdev->dev.parent : &pdev->dev; |
1166 | ||
1167 | /* DMA is only supported when accessed via timberdale */ | |
1168 | if (!(adapter->conf_flags & MICREL_KS884X) && pdata && | |
1169 | (pdata->tx_dma_channel != -1) && | |
1170 | (pdata->rx_dma_channel != -1)) { | |
1171 | adapter->dma_rx.channel = pdata->rx_dma_channel; | |
1172 | adapter->dma_tx.channel = pdata->tx_dma_channel; | |
1173 | } else { | |
1174 | adapter->dma_rx.channel = -1; | |
1175 | adapter->dma_tx.channel = -1; | |
1176 | } | |
1177 | ||
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5 R |
1178 | tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev); |
1179 | spin_lock_init(&adapter->lock); | |
1180 | ||
1181 | netdev->netdev_ops = &ks8842_netdev_ops; | |
1182 | netdev->ethtool_ops = &ks8842_ethtool_ops; | |
1183 | ||
a1aa8822 RR |
1184 | /* Check if a mac address was given */ |
1185 | i = netdev->addr_len; | |
1186 | if (pdata) { | |
1187 | for (i = 0; i < netdev->addr_len; i++) | |
1188 | if (pdata->macaddr[i] != 0) | |
1189 | break; | |
1190 | ||
1191 | if (i < netdev->addr_len) | |
1192 | /* an address was passed, use it */ | |
1193 | memcpy(netdev->dev_addr, pdata->macaddr, | |
1194 | netdev->addr_len); | |
1195 | } | |
1196 | ||
1197 | if (i == netdev->addr_len) { | |
1198 | ks8842_read_mac_addr(adapter, netdev->dev_addr); | |
1199 | ||
1200 | if (!is_valid_ether_addr(netdev->dev_addr)) | |
7ce5d222 | 1201 | eth_hw_addr_random(netdev); |
a1aa8822 | 1202 | } |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="10">b07878e5 R |
1203 | |
1204 | id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE); | |
1205 | ||
1206 | strcpy(netdev->name, "eth%d"); | |
1207 | err = register_netdev(netdev); | |
1208 | if (err) | |
1209 | goto err_register; | |
1210 | ||
1211 | platform_set_drvdata(pdev, netdev); | |
1212 | ||
0dc7d2b3 | 1213 | pr_info("Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n", |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="15">b07878e5 R |
1214 | (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7); |
1215 | ||
1216 | return 0; | |
1217 | ||
1218 | err_register: | |
1219 | err_get_irq: | |
1220 | iounmap(adapter->hw_addr); | |
1221 | err_ioremap: | |
1222 | free_netdev(netdev); | |
1223 | err_alloc_etherdev: | |
1224 | release_mem_region(iomem->start, resource_size(iomem)); | |
1225 | err_mem_region: | |
1226 | return err; | |
1227 | } | |
1228 | ||
654b8c5c | 1229 | static int ks8842_remove(struct platform_device *pdev) |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="10">b07878e5 R |
1230 | { |
1231 | struct net_device *netdev = platform_get_drvdata(pdev); | |
1232 | struct ks8842_adapter *adapter = netdev_priv(netdev); | |
1233 | struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1234 | ||
1235 | unregister_netdev(netdev); | |
1236 | tasklet_kill(&adapter->tasklet); | |
1237 | iounmap(adapter->hw_addr); | |
1238 | free_netdev(netdev); | |
1239 | release_mem_region(iomem->start, resource_size(iomem)); | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="7">b07878e5 R |
1240 | return 0; |
1241 | } | |
1242 | ||
1243 | ||
1244 | static struct platform_driver ks8842_platform_driver = { | |
1245 | .driver = { | |
1246 | .name = DRV_NAME, | |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
1247 | }, |
1248 | .probe = ks8842_probe, | |
654b8c5c | 1249 | .remove = ks8842_remove, |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="2">b07878e5 R |
1250 | }; |
1251 | ||
db62f684 | 1252 | module_platform_driver(ks8842_platform_driver); |
\9aöjfors, 2009-06-04 03:35:55 +0000" rowspan="6">b07878e5 R |
1253 | |
1254 | MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver"); | |
1255 | MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>"); | |
1256 | MODULE_LICENSE("GPL v2"); | |
1257 | MODULE_ALIAS("platform:ks8842"); | |
1258 |