1
2
3
4#include <linux/kernel.h>
5#include <linux/firmware.h>
6#include <linux/pci.h>
7#include <linux/vmalloc.h>
8#include <linux/delay.h>
9#include <linux/interrupt.h>
10#include <linux/sched.h>
11#include <linux/completion.h>
12#include <linux/crc32.h>
13#include <linux/spinlock.h>
14#include <linux/circ_buf.h>
15#include <linux/log2.h>
16
17#include "pcie_priv.h"
18#include "pearl_pcie_regs.h"
19#include "pearl_pcie_ipc.h"
20#include "qtn_hw_ids.h"
21#include "core.h"
22#include "bus.h"
23#include "shm_ipc.h"
24#include "debug.h"
25
26#define PEARL_TX_BD_SIZE_DEFAULT 32
27
28struct qtnf_pearl_bda {
29 __le16 bda_len;
30 __le16 bda_version;
31 __le32 bda_pci_endian;
32 __le32 bda_ep_state;
33 __le32 bda_rc_state;
34 __le32 bda_dma_mask;
35 __le32 bda_msi_addr;
36 __le32 bda_flashsz;
37 u8 bda_boardname[PCIE_BDA_NAMELEN];
38 __le32 bda_rc_msi_enabled;
39 u8 bda_hhbm_list[PCIE_HHBM_MAX_SIZE];
40 __le32 bda_dsbw_start_index;
41 __le32 bda_dsbw_end_index;
42 __le32 bda_dsbw_total_bytes;
43 __le32 bda_rc_tx_bd_base;
44 __le32 bda_rc_tx_bd_num;
45 u8 bda_pcie_mac[QTN_ENET_ADDR_LENGTH];
46 struct qtnf_shm_ipc_region bda_shm_reg1 __aligned(4096);
47 struct qtnf_shm_ipc_region bda_shm_reg2 __aligned(4096);
48} __packed;
49
50struct qtnf_pearl_tx_bd {
51 __le32 addr;
52 __le32 addr_h;
53 __le32 info;
54 __le32 info_h;
55} __packed;
56
57struct qtnf_pearl_rx_bd {
58 __le32 addr;
59 __le32 addr_h;
60 __le32 info;
61 __le32 info_h;
62 __le32 next_ptr;
63 __le32 next_ptr_h;
64} __packed;
65
66struct qtnf_pearl_fw_hdr {
67 u8 boardflg[8];
68 __le32 fwsize;
69 __le32 seqnum;
70 __le32 type;
71 __le32 pktlen;
72 __le32 crc;
73} __packed;
74
75struct qtnf_pcie_pearl_state {
76 struct qtnf_pcie_bus_priv base;
77
78
79 spinlock_t irq_lock;
80
81 struct qtnf_pearl_bda __iomem *bda;
82 void __iomem *pcie_reg_base;
83
84 struct qtnf_pearl_tx_bd *tx_bd_vbase;
85 dma_addr_t tx_bd_pbase;
86
87 struct qtnf_pearl_rx_bd *rx_bd_vbase;
88 dma_addr_t rx_bd_pbase;
89
90 dma_addr_t bd_table_paddr;
91 void *bd_table_vaddr;
92 u32 bd_table_len;
93 u32 pcie_irq_mask;
94 u32 pcie_irq_rx_count;
95 u32 pcie_irq_tx_count;
96 u32 pcie_irq_uf_count;
97};
98
99static inline void qtnf_init_hdp_irqs(struct qtnf_pcie_pearl_state *ps)
100{
101 unsigned long flags;
102
103 spin_lock_irqsave(&ps->irq_lock, flags);
104 ps->pcie_irq_mask = (PCIE_HDP_INT_RX_BITS | PCIE_HDP_INT_TX_BITS);
105 spin_unlock_irqrestore(&ps->irq_lock, flags);
106}
107
108static inline void qtnf_enable_hdp_irqs(struct qtnf_pcie_pearl_state *ps)
109{
110 unsigned long flags;
111
112 spin_lock_irqsave(&ps->irq_lock, flags);
113 writel(ps->pcie_irq_mask, PCIE_HDP_INT_EN(ps->pcie_reg_base));
114 spin_unlock_irqrestore(&ps->irq_lock, flags);
115}
116
117static inline void qtnf_disable_hdp_irqs(struct qtnf_pcie_pearl_state *ps)
118{
119 unsigned long flags;
120
121 spin_lock_irqsave(&ps->irq_lock, flags);
122 writel(0x0, PCIE_HDP_INT_EN(ps->pcie_reg_base));
123 spin_unlock_irqrestore(&ps->irq_lock, flags);
124}
125
126static inline void qtnf_en_rxdone_irq(struct qtnf_pcie_pearl_state *ps)
127{
128 unsigned long flags;
129
130 spin_lock_irqsave(&ps->irq_lock, flags);
131 ps->pcie_irq_mask |= PCIE_HDP_INT_RX_BITS;
132 writel(ps->pcie_irq_mask, PCIE_HDP_INT_EN(ps->pcie_reg_base));
133 spin_unlock_irqrestore(&ps->irq_lock, flags);
134}
135
136static inline void qtnf_dis_rxdone_irq(struct qtnf_pcie_pearl_state *ps)
137{
138 unsigned long flags;
139
140 spin_lock_irqsave(&ps->irq_lock, flags);
141 ps->pcie_irq_mask &= ~PCIE_HDP_INT_RX_BITS;
142 writel(ps->pcie_irq_mask, PCIE_HDP_INT_EN(ps->pcie_reg_base));
143 spin_unlock_irqrestore(&ps->irq_lock, flags);
144}
145
146static inline void qtnf_en_txdone_irq(struct qtnf_pcie_pearl_state *ps)
147{
148 unsigned long flags;
149
150 spin_lock_irqsave(&ps->irq_lock, flags);
151 ps->pcie_irq_mask |= PCIE_HDP_INT_TX_BITS;
152 writel(ps->pcie_irq_mask, PCIE_HDP_INT_EN(ps->pcie_reg_base));
153 spin_unlock_irqrestore(&ps->irq_lock, flags);
154}
155
156static inline void qtnf_dis_txdone_irq(struct qtnf_pcie_pearl_state *ps)
157{
158 unsigned long flags;
159
160 spin_lock_irqsave(&ps->irq_lock, flags);
161 ps->pcie_irq_mask &= ~PCIE_HDP_INT_TX_BITS;
162 writel(ps->pcie_irq_mask, PCIE_HDP_INT_EN(ps->pcie_reg_base));
163 spin_unlock_irqrestore(&ps->irq_lock, flags);
164}
165
166static void qtnf_deassert_intx(struct qtnf_pcie_pearl_state *ps)
167{
168 void __iomem *reg = ps->base.sysctl_bar + PEARL_PCIE_CFG0_OFFSET;
169 u32 cfg;
170
171 cfg = readl(reg);
172 cfg &= ~PEARL_ASSERT_INTX;
173 qtnf_non_posted_write(cfg, reg);
174}
175
176static void qtnf_pearl_reset_ep(struct qtnf_pcie_pearl_state *ps)
177{
178 const u32 data = QTN_PEARL_IPC_IRQ_WORD(QTN_PEARL_LHOST_EP_RESET);
179 void __iomem *reg = ps->base.sysctl_bar +
180 QTN_PEARL_SYSCTL_LHOST_IRQ_OFFSET;
181
182 qtnf_non_posted_write(data, reg);
183 msleep(QTN_EP_RESET_WAIT_MS);
184 pci_restore_state(ps->base.pdev);
185}
186
187static void qtnf_pcie_pearl_ipc_gen_ep_int(void *arg)
188{
189 const struct qtnf_pcie_pearl_state *ps = arg;
190 const u32 data = QTN_PEARL_IPC_IRQ_WORD(QTN_PEARL_LHOST_IPC_IRQ);
191 void __iomem *reg = ps->base.sysctl_bar +
192 QTN_PEARL_SYSCTL_LHOST_IRQ_OFFSET;
193
194 qtnf_non_posted_write(data, reg);
195}
196
197static int qtnf_is_state(__le32 __iomem *reg, u32 state)
198{
199 u32 s = readl(reg);
200
201 return s & state;
202}
203
204static void qtnf_set_state(__le32 __iomem *reg, u32 state)
205{
206 u32 s = readl(reg);
207
208 qtnf_non_posted_write(state | s, reg);
209}
210
211static void qtnf_clear_state(__le32 __iomem *reg, u32 state)
212{
213 u32 s = readl(reg);
214
215 qtnf_non_posted_write(s & ~state, reg);
216}
217
218static int qtnf_poll_state(__le32 __iomem *reg, u32 state, u32 delay_in_ms)
219{
220 u32 timeout = 0;
221
222 while ((qtnf_is_state(reg, state) == 0)) {
223 usleep_range(1000, 1200);
224 if (++timeout > delay_in_ms)
225 return -1;
226 }
227
228 return 0;
229}
230
231static int pearl_alloc_bd_table(struct qtnf_pcie_pearl_state *ps)
232{
233 struct qtnf_pcie_bus_priv *priv = &ps->base;
234 dma_addr_t paddr;
235 void *vaddr;
236 int len;
237
238 len = priv->tx_bd_num * sizeof(struct qtnf_pearl_tx_bd) +
239 priv->rx_bd_num * sizeof(struct qtnf_pearl_rx_bd);
240
241 vaddr = dmam_alloc_coherent(&priv->pdev->dev, len, &paddr, GFP_KERNEL);
242 if (!vaddr)
243 return -ENOMEM;
244
245
246
247 memset(vaddr, 0, len);
248
249 ps->bd_table_vaddr = vaddr;
250 ps->bd_table_paddr = paddr;
251 ps->bd_table_len = len;
252
253 ps->tx_bd_vbase = vaddr;
254 ps->tx_bd_pbase = paddr;
255
256 pr_debug("TX descriptor table: vaddr=0x%p paddr=%pad\n", vaddr, &paddr);
257
258 priv->tx_bd_r_index = 0;
259 priv->tx_bd_w_index = 0;
260
261
262
263 vaddr = ((struct qtnf_pearl_tx_bd *)vaddr) + priv->tx_bd_num;
264 paddr += priv->tx_bd_num * sizeof(struct qtnf_pearl_tx_bd);
265
266 ps->rx_bd_vbase = vaddr;
267 ps->rx_bd_pbase = paddr;
268
269#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
270 writel(QTN_HOST_HI32(paddr),
271 PCIE_HDP_TX_HOST_Q_BASE_H(ps->pcie_reg_base));
272#endif
273 writel(QTN_HOST_LO32(paddr),
274 PCIE_HDP_TX_HOST_Q_BASE_L(ps->pcie_reg_base));
275 writel(priv->rx_bd_num | (sizeof(struct qtnf_pearl_rx_bd)) << 16,
276 PCIE_HDP_TX_HOST_Q_SZ_CTRL(ps->pcie_reg_base));
277
278 pr_debug("RX descriptor table: vaddr=0x%p paddr=%pad\n", vaddr, &paddr);
279
280 return 0;
281}
282
283static int pearl_skb2rbd_attach(struct qtnf_pcie_pearl_state *ps, u16 index)
284{
285 struct qtnf_pcie_bus_priv *priv = &ps->base;
286 struct qtnf_pearl_rx_bd *rxbd;
287 struct sk_buff *skb;
288 dma_addr_t paddr;
289
290 skb = __netdev_alloc_skb_ip_align(NULL, SKB_BUF_SIZE, GFP_ATOMIC);
291 if (!skb) {
292 priv->rx_skb[index] = NULL;
293 return -ENOMEM;
294 }
295
296 priv->rx_skb[index] = skb;
297 rxbd = &ps->rx_bd_vbase[index];
298
299 paddr = pci_map_single(priv->pdev, skb->data,
300 SKB_BUF_SIZE, PCI_DMA_FROMDEVICE);
301 if (pci_dma_mapping_error(priv->pdev, paddr)) {
302 pr_err("skb DMA mapping error: %pad\n", &paddr);
303 return -ENOMEM;
304 }
305
306
307 rxbd->addr = cpu_to_le32(QTN_HOST_LO32(paddr));
308 rxbd->addr_h = cpu_to_le32(QTN_HOST_HI32(paddr));
309 rxbd->info = 0x0;
310
311 priv->rx_bd_w_index = index;
312
313
314 wmb();
315
316#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
317 writel(QTN_HOST_HI32(paddr),
318 PCIE_HDP_HHBM_BUF_PTR_H(ps->pcie_reg_base));
319#endif
320 writel(QTN_HOST_LO32(paddr),
321 PCIE_HDP_HHBM_BUF_PTR(ps->pcie_reg_base));
322
323 writel(index, PCIE_HDP_TX_HOST_Q_WR_PTR(ps->pcie_reg_base));
324 return 0;
325}
326
327static int pearl_alloc_rx_buffers(struct qtnf_pcie_pearl_state *ps)
328{
329 u16 i;
330 int ret = 0;
331
332 memset(ps->rx_bd_vbase, 0x0,
333 ps->base.rx_bd_num * sizeof(struct qtnf_pearl_rx_bd));
334
335 for (i = 0; i < ps->base.rx_bd_num; i++) {
336 ret = pearl_skb2rbd_attach(ps, i);
337 if (ret)
338 break;
339 }
340
341 return ret;
342}
343
344
345static void qtnf_pearl_free_xfer_buffers(struct qtnf_pcie_pearl_state *ps)
346{
347 struct qtnf_pcie_bus_priv *priv = &ps->base;
348 struct qtnf_pearl_tx_bd *txbd;
349 struct qtnf_pearl_rx_bd *rxbd;
350 struct sk_buff *skb;
351 dma_addr_t paddr;
352 int i;
353
354
355 for (i = 0; i < priv->rx_bd_num; i++) {
356 if (priv->rx_skb && priv->rx_skb[i]) {
357 rxbd = &ps->rx_bd_vbase[i];
358 skb = priv->rx_skb[i];
359 paddr = QTN_HOST_ADDR(le32_to_cpu(rxbd->addr_h),
360 le32_to_cpu(rxbd->addr));
361 pci_unmap_single(priv->pdev, paddr, SKB_BUF_SIZE,
362 PCI_DMA_FROMDEVICE);
363 dev_kfree_skb_any(skb);
364 priv->rx_skb[i] = NULL;
365 }
366 }
367
368
369 for (i = 0; i < priv->tx_bd_num; i++) {
370 if (priv->tx_skb && priv->tx_skb[i]) {
371 txbd = &ps->tx_bd_vbase[i];
372 skb = priv->tx_skb[i];
373 paddr = QTN_HOST_ADDR(le32_to_cpu(txbd->addr_h),
374 le32_to_cpu(txbd->addr));
375 pci_unmap_single(priv->pdev, paddr, skb->len,
376 PCI_DMA_TODEVICE);
377 dev_kfree_skb_any(skb);
378 priv->tx_skb[i] = NULL;
379 }
380 }
381}
382
383static int pearl_hhbm_init(struct qtnf_pcie_pearl_state *ps)
384{
385 u32 val;
386
387 val = readl(PCIE_HHBM_CONFIG(ps->pcie_reg_base));
388 val |= HHBM_CONFIG_SOFT_RESET;
389 writel(val, PCIE_HHBM_CONFIG(ps->pcie_reg_base));
390 usleep_range(50, 100);
391 val &= ~HHBM_CONFIG_SOFT_RESET;
392#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
393 val |= HHBM_64BIT;
394#endif
395 writel(val, PCIE_HHBM_CONFIG(ps->pcie_reg_base));
396 writel(ps->base.rx_bd_num, PCIE_HHBM_Q_LIMIT_REG(ps->pcie_reg_base));
397
398 return 0;
399}
400
401static int qtnf_pcie_pearl_init_xfer(struct qtnf_pcie_pearl_state *ps,
402 unsigned int tx_bd_size)
403{
404 struct qtnf_pcie_bus_priv *priv = &ps->base;
405 int ret;
406 u32 val;
407
408 if (tx_bd_size == 0)
409 tx_bd_size = PEARL_TX_BD_SIZE_DEFAULT;
410
411 val = tx_bd_size * sizeof(struct qtnf_pearl_tx_bd);
412
413 if (!is_power_of_2(tx_bd_size) || val > PCIE_HHBM_MAX_SIZE) {
414 pr_warn("bad tx_bd_size value %u\n", tx_bd_size);
415 priv->tx_bd_num = PEARL_TX_BD_SIZE_DEFAULT;
416 } else {
417 priv->tx_bd_num = tx_bd_size;
418 }
419
420 priv->rx_bd_w_index = 0;
421 priv->rx_bd_r_index = 0;
422
423 if (!priv->rx_bd_num || !is_power_of_2(priv->rx_bd_num)) {
424 pr_err("rx_bd_size_param %u is not power of two\n",
425 priv->rx_bd_num);
426 return -EINVAL;
427 }
428
429 val = priv->rx_bd_num * sizeof(dma_addr_t);
430 if (val > PCIE_HHBM_MAX_SIZE) {
431 pr_err("rx_bd_size_param %u is too large\n",
432 priv->rx_bd_num);
433 return -EINVAL;
434 }
435
436 ret = pearl_hhbm_init(ps);
437 if (ret) {
438 pr_err("failed to init h/w queues\n");
439 return ret;
440 }
441
442 ret = qtnf_pcie_alloc_skb_array(priv);
443 if (ret) {
444 pr_err("failed to allocate skb array\n");
445 return ret;
446 }
447
448 ret = pearl_alloc_bd_table(ps);
449 if (ret) {
450 pr_err("failed to allocate bd table\n");
451 return ret;
452 }
453
454 ret = pearl_alloc_rx_buffers(ps);
455 if (ret) {
456 pr_err("failed to allocate rx buffers\n");
457 return ret;
458 }
459
460 return ret;
461}
462
463static void qtnf_pearl_data_tx_reclaim(struct qtnf_pcie_pearl_state *ps)
464{
465 struct qtnf_pcie_bus_priv *priv = &ps->base;
466 struct qtnf_pearl_tx_bd *txbd;
467 struct sk_buff *skb;
468 unsigned long flags;
469 dma_addr_t paddr;
470 u32 tx_done_index;
471 int count = 0;
472 int i;
473
474 spin_lock_irqsave(&priv->tx_reclaim_lock, flags);
475
476 tx_done_index = readl(PCIE_HDP_RX0DMA_CNT(ps->pcie_reg_base))
477 & (priv->tx_bd_num - 1);
478
479 i = priv->tx_bd_r_index;
480
481 while (CIRC_CNT(tx_done_index, i, priv->tx_bd_num)) {
482 skb = priv->tx_skb[i];
483 if (likely(skb)) {
484 txbd = &ps->tx_bd_vbase[i];
485 paddr = QTN_HOST_ADDR(le32_to_cpu(txbd->addr_h),
486 le32_to_cpu(txbd->addr));
487 pci_unmap_single(priv->pdev, paddr, skb->len,
488 PCI_DMA_TODEVICE);
489
490 if (skb->dev) {
491 qtnf_update_tx_stats(skb->dev, skb);
492 if (unlikely(priv->tx_stopped)) {
493 qtnf_wake_all_queues(skb->dev);
494 priv->tx_stopped = 0;
495 }
496 }
497
498 dev_kfree_skb_any(skb);
499 }
500
501 priv->tx_skb[i] = NULL;
502 count++;
503
504 if (++i >= priv->tx_bd_num)
505 i = 0;
506 }
507
508 priv->tx_reclaim_done += count;
509 priv->tx_reclaim_req++;
510 priv->tx_bd_r_index = i;
511
512 spin_unlock_irqrestore(&priv->tx_reclaim_lock, flags);
513}
514
515static int qtnf_tx_queue_ready(struct qtnf_pcie_pearl_state *ps)
516{
517 struct qtnf_pcie_bus_priv *priv = &ps->base;
518
519 if (!CIRC_SPACE(priv->tx_bd_w_index, priv->tx_bd_r_index,
520 priv->tx_bd_num)) {
521 qtnf_pearl_data_tx_reclaim(ps);
522
523 if (!CIRC_SPACE(priv->tx_bd_w_index, priv->tx_bd_r_index,
524 priv->tx_bd_num)) {
525 pr_warn_ratelimited("reclaim full Tx queue\n");
526 priv->tx_full_count++;
527 return 0;
528 }
529 }
530
531 return 1;
532}
533
534static int qtnf_pcie_data_tx(struct qtnf_bus *bus, struct sk_buff *skb)
535{
536 struct qtnf_pcie_pearl_state *ps = get_bus_priv(bus);
537 struct qtnf_pcie_bus_priv *priv = &ps->base;
538 dma_addr_t txbd_paddr, skb_paddr;
539 struct qtnf_pearl_tx_bd *txbd;
540 unsigned long flags;
541 int len, i;
542 u32 info;
543 int ret = 0;
544
545 spin_lock_irqsave(&priv->tx_lock, flags);
546
547 if (!qtnf_tx_queue_ready(ps)) {
548 if (skb->dev) {
549 netif_tx_stop_all_queues(skb->dev);
550 priv->tx_stopped = 1;
551 }
552
553 spin_unlock_irqrestore(&priv->tx_lock, flags);
554 return NETDEV_TX_BUSY;
555 }
556
557 i = priv->tx_bd_w_index;
558 priv->tx_skb[i] = skb;
559 len = skb->len;
560
561 skb_paddr = pci_map_single(priv->pdev, skb->data,
562 skb->len, PCI_DMA_TODEVICE);
563 if (pci_dma_mapping_error(priv->pdev, skb_paddr)) {
564 pr_err("skb DMA mapping error: %pad\n", &skb_paddr);
565 ret = -ENOMEM;
566 goto tx_done;
567 }
568
569 txbd = &ps->tx_bd_vbase[i];
570 txbd->addr = cpu_to_le32(QTN_HOST_LO32(skb_paddr));
571 txbd->addr_h = cpu_to_le32(QTN_HOST_HI32(skb_paddr));
572
573 info = (len & QTN_PCIE_TX_DESC_LEN_MASK) << QTN_PCIE_TX_DESC_LEN_SHIFT;
574 txbd->info = cpu_to_le32(info);
575
576
577 dma_wmb();
578
579
580 txbd_paddr = ps->tx_bd_pbase + i * sizeof(struct qtnf_pearl_tx_bd);
581
582#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
583 writel(QTN_HOST_HI32(txbd_paddr),
584 PCIE_HDP_HOST_WR_DESC0_H(ps->pcie_reg_base));
585#endif
586 writel(QTN_HOST_LO32(txbd_paddr),
587 PCIE_HDP_HOST_WR_DESC0(ps->pcie_reg_base));
588
589 if (++i >= priv->tx_bd_num)
590 i = 0;
591
592 priv->tx_bd_w_index = i;
593
594tx_done:
595 if (ret && skb) {
596 pr_err_ratelimited("drop skb\n");
597 if (skb->dev)
598 skb->dev->stats.tx_dropped++;
599 dev_kfree_skb_any(skb);
600 }
601
602 priv->tx_done_count++;
603 spin_unlock_irqrestore(&priv->tx_lock, flags);
604
605 qtnf_pearl_data_tx_reclaim(ps);
606
607 return NETDEV_TX_OK;
608}
609
610static irqreturn_t qtnf_pcie_pearl_interrupt(int irq, void *data)
611{
612 struct qtnf_bus *bus = (struct qtnf_bus *)data;
613 struct qtnf_pcie_pearl_state *ps = get_bus_priv(bus);
614 struct qtnf_pcie_bus_priv *priv = &ps->base;
615 u32 status;
616
617 priv->pcie_irq_count++;
618 status = readl(PCIE_HDP_INT_STATUS(ps->pcie_reg_base));
619
620 qtnf_shm_ipc_irq_handler(&priv->shm_ipc_ep_in);
621 qtnf_shm_ipc_irq_handler(&priv->shm_ipc_ep_out);
622
623 if (!(status & ps->pcie_irq_mask))
624 goto irq_done;
625
626 if (status & PCIE_HDP_INT_RX_BITS)
627 ps->pcie_irq_rx_count++;
628
629 if (status & PCIE_HDP_INT_TX_BITS)
630 ps->pcie_irq_tx_count++;
631
632 if (status & PCIE_HDP_INT_HHBM_UF)
633 ps->pcie_irq_uf_count++;
634
635 if (status & PCIE_HDP_INT_RX_BITS) {
636 qtnf_dis_rxdone_irq(ps);
637 napi_schedule(&bus->mux_napi);
638 }
639
640 if (status & PCIE_HDP_INT_TX_BITS) {
641 qtnf_dis_txdone_irq(ps);
642 tasklet_hi_schedule(&priv->reclaim_tq);
643 }
644
645irq_done:
646
647 qtnf_non_posted_write(~0U, PCIE_HDP_INT_STATUS(ps->pcie_reg_base));
648
649 if (!priv->msi_enabled)
650 qtnf_deassert_intx(ps);
651
652 return IRQ_HANDLED;
653}
654
655static int qtnf_rx_data_ready(struct qtnf_pcie_pearl_state *ps)
656{
657 u16 index = ps->base.rx_bd_r_index;
658 struct qtnf_pearl_rx_bd *rxbd;
659 u32 descw;
660
661 rxbd = &ps->rx_bd_vbase[index];
662 descw = le32_to_cpu(rxbd->info);
663
664 if (descw & QTN_TXDONE_MASK)
665 return 1;
666
667 return 0;
668}
669
670static int qtnf_pcie_pearl_rx_poll(struct napi_struct *napi, int budget)
671{
672 struct qtnf_bus *bus = container_of(napi, struct qtnf_bus, mux_napi);
673 struct qtnf_pcie_pearl_state *ps = get_bus_priv(bus);
674 struct qtnf_pcie_bus_priv *priv = &ps->base;
675 struct net_device *ndev = NULL;
676 struct sk_buff *skb = NULL;
677 int processed = 0;
678 struct qtnf_pearl_rx_bd *rxbd;
679 dma_addr_t skb_paddr;
680 int consume;
681 u32 descw;
682 u32 psize;
683 u16 r_idx;
684 u16 w_idx;
685 int ret;
686
687 while (processed < budget) {
688 if (!qtnf_rx_data_ready(ps))
689 goto rx_out;
690
691 r_idx = priv->rx_bd_r_index;
692 rxbd = &ps->rx_bd_vbase[r_idx];
693 descw = le32_to_cpu(rxbd->info);
694
695 skb = priv->rx_skb[r_idx];
696 psize = QTN_GET_LEN(descw);
697 consume = 1;
698
699 if (!(descw & QTN_TXDONE_MASK)) {
700 pr_warn("skip invalid rxbd[%d]\n", r_idx);
701 consume = 0;
702 }
703
704 if (!skb) {
705 pr_warn("skip missing rx_skb[%d]\n", r_idx);
706 consume = 0;
707 }
708
709 if (skb && (skb_tailroom(skb) < psize)) {
710 pr_err("skip packet with invalid length: %u > %u\n",
711 psize, skb_tailroom(skb));
712 consume = 0;
713 }
714
715 if (skb) {
716 skb_paddr = QTN_HOST_ADDR(le32_to_cpu(rxbd->addr_h),
717 le32_to_cpu(rxbd->addr));
718 pci_unmap_single(priv->pdev, skb_paddr, SKB_BUF_SIZE,
719 PCI_DMA_FROMDEVICE);
720 }
721
722 if (consume) {
723 skb_put(skb, psize);
724 ndev = qtnf_classify_skb(bus, skb);
725 if (likely(ndev)) {
726 qtnf_update_rx_stats(ndev, skb);
727 skb->protocol = eth_type_trans(skb, ndev);
728 napi_gro_receive(napi, skb);
729 } else {
730 pr_debug("drop untagged skb\n");
731 bus->mux_dev.stats.rx_dropped++;
732 dev_kfree_skb_any(skb);
733 }
734 } else {
735 if (skb) {
736 bus->mux_dev.stats.rx_dropped++;
737 dev_kfree_skb_any(skb);
738 }
739 }
740
741 priv->rx_skb[r_idx] = NULL;
742 if (++r_idx >= priv->rx_bd_num)
743 r_idx = 0;
744
745 priv->rx_bd_r_index = r_idx;
746
747
748 w_idx = priv->rx_bd_w_index;
749 while (CIRC_SPACE(priv->rx_bd_w_index, priv->rx_bd_r_index,
750 priv->rx_bd_num) > 0) {
751 if (++w_idx >= priv->rx_bd_num)
752 w_idx = 0;
753
754 ret = pearl_skb2rbd_attach(ps, w_idx);
755 if (ret) {
756 pr_err("failed to allocate new rx_skb[%d]\n",
757 w_idx);
758 break;
759 }
760 }
761
762 processed++;
763 }
764
765rx_out:
766 if (processed < budget) {
767 napi_complete(napi);
768 qtnf_en_rxdone_irq(ps);
769 }
770
771 return processed;
772}
773
774static void
775qtnf_pcie_data_tx_timeout(struct qtnf_bus *bus, struct net_device *ndev)
776{
777 struct qtnf_pcie_pearl_state *ps = (void *)get_bus_priv(bus);
778
779 tasklet_hi_schedule(&ps->base.reclaim_tq);
780}
781
782static void qtnf_pcie_data_rx_start(struct qtnf_bus *bus)
783{
784 struct qtnf_pcie_pearl_state *ps = (void *)get_bus_priv(bus);
785
786 qtnf_enable_hdp_irqs(ps);
787 napi_enable(&bus->mux_napi);
788}
789
790static void qtnf_pcie_data_rx_stop(struct qtnf_bus *bus)
791{
792 struct qtnf_pcie_pearl_state *ps = (void *)get_bus_priv(bus);
793
794 napi_disable(&bus->mux_napi);
795 qtnf_disable_hdp_irqs(ps);
796}
797
798static const struct qtnf_bus_ops qtnf_pcie_pearl_bus_ops = {
799
800 .control_tx = qtnf_pcie_control_tx,
801
802
803 .data_tx = qtnf_pcie_data_tx,
804 .data_tx_timeout = qtnf_pcie_data_tx_timeout,
805 .data_rx_start = qtnf_pcie_data_rx_start,
806 .data_rx_stop = qtnf_pcie_data_rx_stop,
807};
808
809static int qtnf_dbg_irq_stats(struct seq_file *s, void *data)
810{
811 struct qtnf_bus *bus = dev_get_drvdata(s->private);
812 struct qtnf_pcie_pearl_state *ps = get_bus_priv(bus);
813 u32 reg = readl(PCIE_HDP_INT_EN(ps->pcie_reg_base));
814 u32 status;
815
816 seq_printf(s, "pcie_irq_count(%u)\n", ps->base.pcie_irq_count);
817 seq_printf(s, "pcie_irq_tx_count(%u)\n", ps->pcie_irq_tx_count);
818 status = reg & PCIE_HDP_INT_TX_BITS;
819 seq_printf(s, "pcie_irq_tx_status(%s)\n",
820 (status == PCIE_HDP_INT_TX_BITS) ? "EN" : "DIS");
821 seq_printf(s, "pcie_irq_rx_count(%u)\n", ps->pcie_irq_rx_count);
822 status = reg & PCIE_HDP_INT_RX_BITS;
823 seq_printf(s, "pcie_irq_rx_status(%s)\n",
824 (status == PCIE_HDP_INT_RX_BITS) ? "EN" : "DIS");
825 seq_printf(s, "pcie_irq_uf_count(%u)\n", ps->pcie_irq_uf_count);
826 status = reg & PCIE_HDP_INT_HHBM_UF;
827 seq_printf(s, "pcie_irq_hhbm_uf_status(%s)\n",
828 (status == PCIE_HDP_INT_HHBM_UF) ? "EN" : "DIS");
829
830 return 0;
831}
832
833static int qtnf_dbg_hdp_stats(struct seq_file *s, void *data)
834{
835 struct qtnf_bus *bus = dev_get_drvdata(s->private);
836 struct qtnf_pcie_pearl_state *ps = get_bus_priv(bus);
837 struct qtnf_pcie_bus_priv *priv = &ps->base;
838
839 seq_printf(s, "tx_full_count(%u)\n", priv->tx_full_count);
840 seq_printf(s, "tx_done_count(%u)\n", priv->tx_done_count);
841 seq_printf(s, "tx_reclaim_done(%u)\n", priv->tx_reclaim_done);
842 seq_printf(s, "tx_reclaim_req(%u)\n", priv->tx_reclaim_req);
843
844 seq_printf(s, "tx_bd_r_index(%u)\n", priv->tx_bd_r_index);
845 seq_printf(s, "tx_bd_p_index(%u)\n",
846 readl(PCIE_HDP_RX0DMA_CNT(ps->pcie_reg_base))
847 & (priv->tx_bd_num - 1));
848 seq_printf(s, "tx_bd_w_index(%u)\n", priv->tx_bd_w_index);
849 seq_printf(s, "tx queue len(%u)\n",
850 CIRC_CNT(priv->tx_bd_w_index, priv->tx_bd_r_index,
851 priv->tx_bd_num));
852
853 seq_printf(s, "rx_bd_r_index(%u)\n", priv->rx_bd_r_index);
854 seq_printf(s, "rx_bd_p_index(%u)\n",
855 readl(PCIE_HDP_TX0DMA_CNT(ps->pcie_reg_base))
856 & (priv->rx_bd_num - 1));
857 seq_printf(s, "rx_bd_w_index(%u)\n", priv->rx_bd_w_index);
858 seq_printf(s, "rx alloc queue len(%u)\n",
859 CIRC_SPACE(priv->rx_bd_w_index, priv->rx_bd_r_index,
860 priv->rx_bd_num));
861
862 return 0;
863}
864
865static int qtnf_ep_fw_send(struct pci_dev *pdev, uint32_t size,
866 int blk, const u8 *pblk, const u8 *fw)
867{
868 struct qtnf_bus *bus = pci_get_drvdata(pdev);
869
870 struct qtnf_pearl_fw_hdr *hdr;
871 u8 *pdata;
872
873 int hds = sizeof(*hdr);
874 struct sk_buff *skb = NULL;
875 int len = 0;
876 int ret;
877
878 skb = __dev_alloc_skb(QTN_PCIE_FW_BUFSZ, GFP_KERNEL);
879 if (!skb)
880 return -ENOMEM;
881
882 skb->len = QTN_PCIE_FW_BUFSZ;
883 skb->dev = NULL;
884
885 hdr = (struct qtnf_pearl_fw_hdr *)skb->data;
886 memcpy(hdr->boardflg, QTN_PCIE_BOARDFLG, strlen(QTN_PCIE_BOARDFLG));
887 hdr->fwsize = cpu_to_le32(size);
888 hdr->seqnum = cpu_to_le32(blk);
889
890 if (blk)
891 hdr->type = cpu_to_le32(QTN_FW_DSUB);
892 else
893 hdr->type = cpu_to_le32(QTN_FW_DBEGIN);
894
895 pdata = skb->data + hds;
896
897 len = QTN_PCIE_FW_BUFSZ - hds;
898 if (pblk >= (fw + size - len)) {
899 len = fw + size - pblk;
900 hdr->type = cpu_to_le32(QTN_FW_DEND);
901 }
902
903 hdr->pktlen = cpu_to_le32(len);
904 memcpy(pdata, pblk, len);
905 hdr->crc = cpu_to_le32(~crc32(0, pdata, len));
906
907 ret = qtnf_pcie_data_tx(bus, skb);
908
909 return (ret == NETDEV_TX_OK) ? len : 0;
910}
911
912static int
913qtnf_ep_fw_load(struct qtnf_pcie_pearl_state *ps, const u8 *fw, u32 fw_size)
914{
915 int blk_size = QTN_PCIE_FW_BUFSZ - sizeof(struct qtnf_pearl_fw_hdr);
916 int blk_count = fw_size / blk_size + ((fw_size % blk_size) ? 1 : 0);
917 const u8 *pblk = fw;
918 int threshold = 0;
919 int blk = 0;
920 int len;
921
922 pr_debug("FW upload started: fw_addr=0x%p size=%d\n", fw, fw_size);
923
924 while (blk < blk_count) {
925 if (++threshold > 10000) {
926 pr_err("FW upload failed: too many retries\n");
927 return -ETIMEDOUT;
928 }
929
930 len = qtnf_ep_fw_send(ps->base.pdev, fw_size, blk, pblk, fw);
931 if (len <= 0)
932 continue;
933
934 if (!((blk + 1) & QTN_PCIE_FW_DLMASK) ||
935 (blk == (blk_count - 1))) {
936 qtnf_set_state(&ps->bda->bda_rc_state,
937 QTN_RC_FW_SYNC);
938 if (qtnf_poll_state(&ps->bda->bda_ep_state,
939 QTN_EP_FW_SYNC,
940 QTN_FW_DL_TIMEOUT_MS)) {
941 pr_err("FW upload failed: SYNC timed out\n");
942 return -ETIMEDOUT;
943 }
944
945 qtnf_clear_state(&ps->bda->bda_ep_state,
946 QTN_EP_FW_SYNC);
947
948 if (qtnf_is_state(&ps->bda->bda_ep_state,
949 QTN_EP_FW_RETRY)) {
950 if (blk == (blk_count - 1)) {
951 int last_round =
952 blk_count & QTN_PCIE_FW_DLMASK;
953 blk -= last_round;
954 pblk -= ((last_round - 1) *
955 blk_size + len);
956 } else {
957 blk -= QTN_PCIE_FW_DLMASK;
958 pblk -= QTN_PCIE_FW_DLMASK * blk_size;
959 }
960
961 qtnf_clear_state(&ps->bda->bda_ep_state,
962 QTN_EP_FW_RETRY);
963
964 pr_warn("FW upload retry: block #%d\n", blk);
965 continue;
966 }
967
968 qtnf_pearl_data_tx_reclaim(ps);
969 }
970
971 pblk += len;
972 blk++;
973 }
974
975 pr_debug("FW upload completed: totally sent %d blocks\n", blk);
976 return 0;
977}
978
979static void qtnf_pearl_fw_work_handler(struct work_struct *work)
980{
981 struct qtnf_bus *bus = container_of(work, struct qtnf_bus, fw_work);
982 struct qtnf_pcie_pearl_state *ps = (void *)get_bus_priv(bus);
983 u32 state = QTN_RC_FW_LOADRDY | QTN_RC_FW_QLINK;
984 const char *fwname = QTN_PCI_PEARL_FW_NAME;
985 struct pci_dev *pdev = ps->base.pdev;
986 const struct firmware *fw;
987 int ret;
988
989 if (ps->base.flashboot) {
990 state |= QTN_RC_FW_FLASHBOOT;
991 } else {
992 ret = request_firmware(&fw, fwname, &pdev->dev);
993 if (ret < 0) {
994 pr_err("failed to get firmware %s\n", fwname);
995 goto fw_load_exit;
996 }
997 }
998
999 qtnf_set_state(&ps->bda->bda_rc_state, state);
1000
1001 if (qtnf_poll_state(&ps->bda->bda_ep_state, QTN_EP_FW_LOADRDY,
1002 QTN_FW_DL_TIMEOUT_MS)) {
1003 pr_err("card is not ready\n");
1004
1005 if (!ps->base.flashboot)
1006 release_firmware(fw);
1007
1008 goto fw_load_exit;
1009 }
1010
1011 qtnf_clear_state(&ps->bda->bda_ep_state, QTN_EP_FW_LOADRDY);
1012
1013 if (ps->base.flashboot) {
1014 pr_info("booting firmware from flash\n");
1015
1016 } else {
1017 pr_info("starting firmware upload: %s\n", fwname);
1018
1019 ret = qtnf_ep_fw_load(ps, fw->data, fw->size);
1020 release_firmware(fw);
1021 if (ret) {
1022 pr_err("firmware upload error\n");
1023 goto fw_load_exit;
1024 }
1025 }
1026
1027 if (qtnf_poll_state(&ps->bda->bda_ep_state, QTN_EP_FW_DONE,
1028 QTN_FW_DL_TIMEOUT_MS)) {
1029 pr_err("firmware bringup timed out\n");
1030 goto fw_load_exit;
1031 }
1032
1033 if (qtnf_poll_state(&ps->bda->bda_ep_state,
1034 QTN_EP_FW_QLINK_DONE, QTN_FW_QLINK_TIMEOUT_MS)) {
1035 pr_err("firmware runtime failure\n");
1036 goto fw_load_exit;
1037 }
1038
1039 pr_info("firmware is up and running\n");
1040
1041 ret = qtnf_pcie_fw_boot_done(bus);
1042 if (ret)
1043 goto fw_load_exit;
1044
1045 qtnf_debugfs_add_entry(bus, "hdp_stats", qtnf_dbg_hdp_stats);
1046 qtnf_debugfs_add_entry(bus, "irq_stats", qtnf_dbg_irq_stats);
1047
1048fw_load_exit:
1049 put_device(&pdev->dev);
1050}
1051
1052static void qtnf_pearl_reclaim_tasklet_fn(unsigned long data)
1053{
1054 struct qtnf_pcie_pearl_state *ps = (void *)data;
1055
1056 qtnf_pearl_data_tx_reclaim(ps);
1057 qtnf_en_txdone_irq(ps);
1058}
1059
1060static u64 qtnf_pearl_dma_mask_get(void)
1061{
1062#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
1063 return DMA_BIT_MASK(64);
1064#else
1065 return DMA_BIT_MASK(32);
1066#endif
1067}
1068
1069static int qtnf_pcie_pearl_probe(struct qtnf_bus *bus, unsigned int tx_bd_size)
1070{
1071 struct qtnf_shm_ipc_int ipc_int;
1072 struct qtnf_pcie_pearl_state *ps = get_bus_priv(bus);
1073 struct pci_dev *pdev = ps->base.pdev;
1074 int ret;
1075
1076 bus->bus_ops = &qtnf_pcie_pearl_bus_ops;
1077 spin_lock_init(&ps->irq_lock);
1078 INIT_WORK(&bus->fw_work, qtnf_pearl_fw_work_handler);
1079
1080 ps->pcie_reg_base = ps->base.dmareg_bar;
1081 ps->bda = ps->base.epmem_bar;
1082 writel(ps->base.msi_enabled, &ps->bda->bda_rc_msi_enabled);
1083
1084 ret = qtnf_pcie_pearl_init_xfer(ps, tx_bd_size);
1085 if (ret) {
1086 pr_err("PCIE xfer init failed\n");
1087 return ret;
1088 }
1089
1090
1091 qtnf_init_hdp_irqs(ps);
1092
1093
1094 qtnf_disable_hdp_irqs(ps);
1095
1096 ret = devm_request_irq(&pdev->dev, pdev->irq,
1097 &qtnf_pcie_pearl_interrupt, 0,
1098 "qtnf_pearl_irq", (void *)bus);
1099 if (ret) {
1100 pr_err("failed to request pcie irq %d\n", pdev->irq);
1101 qtnf_pearl_free_xfer_buffers(ps);
1102 return ret;
1103 }
1104
1105 tasklet_init(&ps->base.reclaim_tq, qtnf_pearl_reclaim_tasklet_fn,
1106 (unsigned long)ps);
1107 netif_napi_add(&bus->mux_dev, &bus->mux_napi,
1108 qtnf_pcie_pearl_rx_poll, 10);
1109
1110 ipc_int.fn = qtnf_pcie_pearl_ipc_gen_ep_int;
1111 ipc_int.arg = ps;
1112 qtnf_pcie_init_shm_ipc(&ps->base, &ps->bda->bda_shm_reg1,
1113 &ps->bda->bda_shm_reg2, &ipc_int);
1114
1115 return 0;
1116}
1117
1118static void qtnf_pcie_pearl_remove(struct qtnf_bus *bus)
1119{
1120 struct qtnf_pcie_pearl_state *ps = get_bus_priv(bus);
1121
1122 qtnf_pearl_reset_ep(ps);
1123 qtnf_pearl_free_xfer_buffers(ps);
1124}
1125
1126#ifdef CONFIG_PM_SLEEP
1127static int qtnf_pcie_pearl_suspend(struct qtnf_bus *bus)
1128{
1129 return -EOPNOTSUPP;
1130}
1131
1132static int qtnf_pcie_pearl_resume(struct qtnf_bus *bus)
1133{
1134 return 0;
1135}
1136#endif
1137
1138struct qtnf_bus *qtnf_pcie_pearl_alloc(struct pci_dev *pdev)
1139{
1140 struct qtnf_bus *bus;
1141 struct qtnf_pcie_pearl_state *ps;
1142
1143 bus = devm_kzalloc(&pdev->dev, sizeof(*bus) + sizeof(*ps), GFP_KERNEL);
1144 if (!bus)
1145 return NULL;
1146
1147 ps = get_bus_priv(bus);
1148 ps->base.probe_cb = qtnf_pcie_pearl_probe;
1149 ps->base.remove_cb = qtnf_pcie_pearl_remove;
1150 ps->base.dma_mask_get_cb = qtnf_pearl_dma_mask_get;
1151#ifdef CONFIG_PM_SLEEP
1152 ps->base.resume_cb = qtnf_pcie_pearl_resume;
1153 ps->base.suspend_cb = qtnf_pcie_pearl_suspend;
1154#endif
1155
1156 return bus;
1157}
1158
