1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * BCM6368 Ethernet Switch Controller Driver
5 * Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
6 * Copyright (C) 2015 Jonas Gorski <jonas.gorski@gmail.com>
7 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/err.h>
14 #include <linux/ethtool.h>
15 #include <linux/if_vlan.h>
16 #include <linux/interrupt.h>
17 #include <linux/of_clk.h>
18 #include <linux/of_net.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_domain.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/reset.h>
25 #define ENETSW_TAG_SIZE 6
26 #define ENETSW_MTU_OVERHEAD (VLAN_ETH_HLEN + VLAN_HLEN + \
28 #define ENETSW_FRAG_SIZE(x) (SKB_DATA_ALIGN(NET_SKB_PAD + x + \
29 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))))
31 /* default number of descriptor */
32 #define ENETSW_DEF_RX_DESC 64
33 #define ENETSW_DEF_TX_DESC 32
34 #define ENETSW_DEF_CPY_BREAK 128
36 /* maximum burst len for dma (4 bytes unit) */
37 #define ENETSW_DMA_MAXBURST 8
40 #define DMA_CHAN_WIDTH 0x10
42 /* Controller Configuration Register */
43 #define DMA_CFG_REG 0x0
44 #define DMA_CFG_EN_SHIFT 0
45 #define DMA_CFG_EN_MASK (1 << DMA_CFG_EN_SHIFT)
46 #define DMA_CFG_FLOWCH_MASK(x) (1 << ((x >> 1) + 1))
48 /* Flow Control Descriptor Low Threshold register */
49 #define DMA_FLOWCL_REG(x) (0x4 + (x) * 6)
51 /* Flow Control Descriptor High Threshold register */
52 #define DMA_FLOWCH_REG(x) (0x8 + (x) * 6)
54 /* Flow Control Descriptor Buffer Alloca Threshold register */
55 #define DMA_BUFALLOC_REG(x) (0xc + (x) * 6)
56 #define DMA_BUFALLOC_FORCE_SHIFT 31
57 #define DMA_BUFALLOC_FORCE_MASK (1 << DMA_BUFALLOC_FORCE_SHIFT)
59 /* Channel Configuration register */
60 #define DMAC_CHANCFG_REG 0x0
61 #define DMAC_CHANCFG_EN_SHIFT 0
62 #define DMAC_CHANCFG_EN_MASK (1 << DMAC_CHANCFG_EN_SHIFT)
63 #define DMAC_CHANCFG_PKTHALT_SHIFT 1
64 #define DMAC_CHANCFG_PKTHALT_MASK (1 << DMAC_CHANCFG_PKTHALT_SHIFT)
65 #define DMAC_CHANCFG_BUFHALT_SHIFT 2
66 #define DMAC_CHANCFG_BUFHALT_MASK (1 << DMAC_CHANCFG_BUFHALT_SHIFT)
67 #define DMAC_CHANCFG_CHAINING_SHIFT 2
68 #define DMAC_CHANCFG_CHAINING_MASK (1 << DMAC_CHANCFG_CHAINING_SHIFT)
69 #define DMAC_CHANCFG_WRAP_EN_SHIFT 3
70 #define DMAC_CHANCFG_WRAP_EN_MASK (1 << DMAC_CHANCFG_WRAP_EN_SHIFT)
71 #define DMAC_CHANCFG_FLOWC_EN_SHIFT 4
72 #define DMAC_CHANCFG_FLOWC_EN_MASK (1 << DMAC_CHANCFG_FLOWC_EN_SHIFT)
74 /* Interrupt Control/Status register */
75 #define DMAC_IR_REG 0x4
76 #define DMAC_IR_BUFDONE_MASK (1 << 0)
77 #define DMAC_IR_PKTDONE_MASK (1 << 1)
78 #define DMAC_IR_NOTOWNER_MASK (1 << 2)
80 /* Interrupt Mask register */
81 #define DMAC_IRMASK_REG 0x8
83 /* Maximum Burst Length */
84 #define DMAC_MAXBURST_REG 0xc
86 /* Ring Start Address register */
87 #define DMAS_RSTART_REG 0x0
89 /* State Ram Word 2 */
90 #define DMAS_SRAM2_REG 0x4
92 /* State Ram Word 3 */
93 #define DMAS_SRAM3_REG 0x8
95 /* State Ram Word 4 */
96 #define DMAS_SRAM4_REG 0xc
98 struct bcm6368_enetsw_desc
{
104 #define DMADESC_LENGTH_SHIFT 16
105 #define DMADESC_LENGTH_MASK (0xfff << DMADESC_LENGTH_SHIFT)
106 #define DMADESC_OWNER_MASK (1 << 15)
107 #define DMADESC_EOP_MASK (1 << 14)
108 #define DMADESC_SOP_MASK (1 << 13)
109 #define DMADESC_ESOP_MASK (DMADESC_EOP_MASK | DMADESC_SOP_MASK)
110 #define DMADESC_WRAP_MASK (1 << 12)
111 #define DMADESC_USB_NOZERO_MASK (1 << 1)
112 #define DMADESC_USB_ZERO_MASK (1 << 0)
115 #define DMADESC_UNDER_MASK (1 << 9)
116 #define DMADESC_APPEND_CRC (1 << 8)
117 #define DMADESC_OVSIZE_MASK (1 << 4)
118 #define DMADESC_RXER_MASK (1 << 2)
119 #define DMADESC_CRC_MASK (1 << 1)
120 #define DMADESC_OV_MASK (1 << 0)
121 #define DMADESC_ERR_MASK (DMADESC_UNDER_MASK | \
122 DMADESC_OVSIZE_MASK | \
123 DMADESC_RXER_MASK | \
127 struct bcm6368_enetsw
{
128 void __iomem
*dma_base
;
129 void __iomem
*dma_chan
;
130 void __iomem
*dma_sram
;
133 struct device_link
**link_pm
;
137 unsigned int num_clocks
;
139 struct reset_control
**reset
;
140 unsigned int num_resets
;
147 /* hw view of rx & tx dma ring */
148 dma_addr_t rx_desc_dma
;
149 dma_addr_t tx_desc_dma
;
151 /* allocated size (in bytes) for rx & tx dma ring */
152 unsigned int rx_desc_alloc_size
;
153 unsigned int tx_desc_alloc_size
;
155 struct napi_struct napi
;
157 /* dma channel id for rx */
160 /* number of dma desc in rx ring */
163 /* cpu view of rx dma ring */
164 struct bcm6368_enetsw_desc
*rx_desc_cpu
;
166 /* current number of armed descriptor given to hardware for rx */
169 /* next rx descriptor to fetch from hardware */
172 /* next dirty rx descriptor to refill */
175 /* size of allocated rx buffer */
176 unsigned int rx_buf_size
;
178 /* size of allocated rx frag */
179 unsigned int rx_frag_size
;
181 /* list of buffer given to hw for rx */
182 unsigned char **rx_buf
;
184 /* used when rx buffer allocation failed, so we defer rx queue
186 struct timer_list rx_timeout
;
188 /* lock rx_timeout against rx normal operation */
191 /* dma channel id for tx */
194 /* number of dma desc in tx ring */
197 /* maximum dma burst size */
200 /* cpu view of rx dma ring */
201 struct bcm6368_enetsw_desc
*tx_desc_cpu
;
203 /* number of available descriptor for tx */
206 /* next tx descriptor avaiable */
209 /* next dirty tx descriptor to reclaim */
212 /* list of skb given to hw for tx */
213 struct sk_buff
**tx_skb
;
215 /* lock used by tx reclaim and xmit */
218 /* network device reference */
219 struct net_device
*net_dev
;
221 /* platform device reference */
222 struct platform_device
*pdev
;
224 /* dma channel enable mask */
225 u32 dma_chan_en_mask
;
227 /* dma channel interrupt mask */
228 u32 dma_chan_int_mask
;
230 /* dma channel width */
231 unsigned int dma_chan_width
;
234 static inline void dma_writel(struct bcm6368_enetsw
*priv
, u32 val
, u32 off
)
236 __raw_writel(val
, priv
->dma_base
+ off
);
239 static inline u32
dma_readl(struct bcm6368_enetsw
*priv
, u32 off
, int chan
)
241 return __raw_readl(priv
->dma_chan
+ off
+ chan
* priv
->dma_chan_width
);
244 static inline void dmac_writel(struct bcm6368_enetsw
*priv
, u32 val
,
247 __raw_writel(val
, priv
->dma_chan
+ off
+ chan
* priv
->dma_chan_width
);
250 static inline void dmas_writel(struct bcm6368_enetsw
*priv
, u32 val
,
253 __raw_writel(val
, priv
->dma_sram
+ off
+ chan
* priv
->dma_chan_width
);
259 static int bcm6368_enetsw_refill_rx(struct net_device
*dev
, bool napi_mode
)
261 struct bcm6368_enetsw
*priv
= netdev_priv(dev
);
263 while (priv
->rx_desc_count
< priv
->rx_ring_size
) {
264 struct bcm6368_enetsw_desc
*desc
;
268 desc_idx
= priv
->rx_dirty_desc
;
269 desc
= &priv
->rx_desc_cpu
[desc_idx
];
271 if (!priv
->rx_buf
[desc_idx
]) {
274 if (likely(napi_mode
))
275 buf
= napi_alloc_frag(priv
->rx_frag_size
);
277 buf
= netdev_alloc_frag(priv
->rx_frag_size
);
282 priv
->rx_buf
[desc_idx
] = buf
;
283 desc
->address
= dma_map_single(&priv
->pdev
->dev
,
289 len_stat
= priv
->rx_buf_size
<< DMADESC_LENGTH_SHIFT
;
290 len_stat
|= DMADESC_OWNER_MASK
;
291 if (priv
->rx_dirty_desc
== priv
->rx_ring_size
- 1) {
292 len_stat
|= DMADESC_WRAP_MASK
;
293 priv
->rx_dirty_desc
= 0;
295 priv
->rx_dirty_desc
++;
298 desc
->len_stat
= len_stat
;
300 priv
->rx_desc_count
++;
302 /* tell dma engine we allocated one buffer */
303 dma_writel(priv
, 1, DMA_BUFALLOC_REG(priv
->rx_chan
));
306 /* If rx ring is still empty, set a timer to try allocating
307 * again at a later time. */
308 if (priv
->rx_desc_count
== 0 && netif_running(dev
)) {
309 dev_warn(&priv
->pdev
->dev
, "unable to refill rx ring\n");
310 priv
->rx_timeout
.expires
= jiffies
+ HZ
;
311 add_timer(&priv
->rx_timeout
);
318 * timer callback to defer refill rx queue in case we're OOM
320 static void bcm6368_enetsw_refill_rx_timer(struct timer_list
*t
)
322 struct bcm6368_enetsw
*priv
= from_timer(priv
, t
, rx_timeout
);
323 struct net_device
*dev
= priv
->net_dev
;
325 spin_lock(&priv
->rx_lock
);
326 bcm6368_enetsw_refill_rx(dev
, false);
327 spin_unlock(&priv
->rx_lock
);
331 * extract packet from rx queue
333 static int bcm6368_enetsw_receive_queue(struct net_device
*dev
, int budget
)
335 struct bcm6368_enetsw
*priv
= netdev_priv(dev
);
336 struct device
*kdev
= &priv
->pdev
->dev
;
337 struct list_head rx_list
;
340 INIT_LIST_HEAD(&rx_list
);
342 /* don't scan ring further than number of refilled
344 if (budget
> priv
->rx_desc_count
)
345 budget
= priv
->rx_desc_count
;
348 struct bcm6368_enetsw_desc
*desc
;
349 unsigned int frag_size
;
356 desc_idx
= priv
->rx_curr_desc
;
357 desc
= &priv
->rx_desc_cpu
[desc_idx
];
359 /* make sure we actually read the descriptor status at
363 len_stat
= desc
->len_stat
;
365 /* break if dma ownership belongs to hw */
366 if (len_stat
& DMADESC_OWNER_MASK
)
370 priv
->rx_curr_desc
++;
371 if (priv
->rx_curr_desc
== priv
->rx_ring_size
)
372 priv
->rx_curr_desc
= 0;
374 /* if the packet does not have start of packet _and_
375 * end of packet flag set, then just recycle it */
376 if ((len_stat
& DMADESC_ESOP_MASK
) != DMADESC_ESOP_MASK
) {
377 dev
->stats
.rx_dropped
++;
382 buf
= priv
->rx_buf
[desc_idx
];
383 len
= (len_stat
& DMADESC_LENGTH_MASK
)
384 >> DMADESC_LENGTH_SHIFT
;
385 /* don't include FCS */
388 if (len
< priv
->copybreak
) {
389 unsigned int nfrag_size
= ENETSW_FRAG_SIZE(len
);
390 unsigned char *nbuf
= napi_alloc_frag(nfrag_size
);
392 if (unlikely(!nbuf
)) {
393 /* forget packet, just rearm desc */
394 dev
->stats
.rx_dropped
++;
398 dma_sync_single_for_cpu(kdev
, desc
->address
,
399 len
, DMA_FROM_DEVICE
);
400 memcpy(nbuf
+ NET_SKB_PAD
, buf
+ NET_SKB_PAD
, len
);
401 dma_sync_single_for_device(kdev
, desc
->address
,
402 len
, DMA_FROM_DEVICE
);
404 frag_size
= nfrag_size
;
406 dma_unmap_single(kdev
, desc
->address
,
407 priv
->rx_buf_size
, DMA_FROM_DEVICE
);
408 priv
->rx_buf
[desc_idx
] = NULL
;
409 frag_size
= priv
->rx_frag_size
;
412 skb
= napi_build_skb(buf
, frag_size
);
413 if (unlikely(!skb
)) {
415 dev
->stats
.rx_dropped
++;
419 skb_reserve(skb
, NET_SKB_PAD
);
421 skb
->protocol
= eth_type_trans(skb
, dev
);
422 dev
->stats
.rx_packets
++;
423 dev
->stats
.rx_bytes
+= len
;
424 list_add_tail(&skb
->list
, &rx_list
);
425 } while (processed
< budget
);
427 netif_receive_skb_list(&rx_list
);
428 priv
->rx_desc_count
-= processed
;
430 if (processed
|| !priv
->rx_desc_count
) {
431 bcm6368_enetsw_refill_rx(dev
, true);
434 dmac_writel(priv
, priv
->dma_chan_en_mask
,
435 DMAC_CHANCFG_REG
, priv
->rx_chan
);
442 * try to or force reclaim of transmitted buffers
444 static int bcm6368_enetsw_tx_reclaim(struct net_device
*dev
, int force
)
446 struct bcm6368_enetsw
*priv
= netdev_priv(dev
);
449 while (priv
->tx_desc_count
< priv
->tx_ring_size
) {
450 struct bcm6368_enetsw_desc
*desc
;
453 /* We run in a bh and fight against start_xmit, which
454 * is called with bh disabled */
455 spin_lock(&priv
->tx_lock
);
457 desc
= &priv
->tx_desc_cpu
[priv
->tx_dirty_desc
];
459 if (!force
&& (desc
->len_stat
& DMADESC_OWNER_MASK
)) {
460 spin_unlock(&priv
->tx_lock
);
464 /* ensure other field of the descriptor were not read
465 * before we checked ownership */
468 skb
= priv
->tx_skb
[priv
->tx_dirty_desc
];
469 priv
->tx_skb
[priv
->tx_dirty_desc
] = NULL
;
470 dma_unmap_single(&priv
->pdev
->dev
, desc
->address
, skb
->len
,
473 priv
->tx_dirty_desc
++;
474 if (priv
->tx_dirty_desc
== priv
->tx_ring_size
)
475 priv
->tx_dirty_desc
= 0;
476 priv
->tx_desc_count
++;
478 spin_unlock(&priv
->tx_lock
);
480 if (desc
->len_stat
& DMADESC_UNDER_MASK
)
481 dev
->stats
.tx_errors
++;
483 napi_consume_skb(skb
, !force
);
487 if (netif_queue_stopped(dev
) && released
)
488 netif_wake_queue(dev
);
494 * poll func, called by network core
496 static int bcm6368_enetsw_poll(struct napi_struct
*napi
, int budget
)
498 struct bcm6368_enetsw
*priv
= container_of(napi
, struct bcm6368_enetsw
, napi
);
499 struct net_device
*dev
= priv
->net_dev
;
503 dmac_writel(priv
, priv
->dma_chan_int_mask
,
504 DMAC_IR_REG
, priv
->rx_chan
);
505 dmac_writel(priv
, priv
->dma_chan_int_mask
,
506 DMAC_IR_REG
, priv
->tx_chan
);
508 /* reclaim sent skb */
509 bcm6368_enetsw_tx_reclaim(dev
, 0);
511 spin_lock(&priv
->rx_lock
);
512 rx_work_done
= bcm6368_enetsw_receive_queue(dev
, budget
);
513 spin_unlock(&priv
->rx_lock
);
515 if (rx_work_done
>= budget
) {
516 /* rx queue is not yet empty/clean */
520 /* no more packet in rx/tx queue, remove device from poll
522 napi_complete_done(napi
, rx_work_done
);
524 /* restore rx/tx interrupt */
525 dmac_writel(priv
, priv
->dma_chan_int_mask
,
526 DMAC_IRMASK_REG
, priv
->rx_chan
);
527 dmac_writel(priv
, priv
->dma_chan_int_mask
,
528 DMAC_IRMASK_REG
, priv
->tx_chan
);
534 * rx/tx dma interrupt handler
536 static irqreturn_t
bcm6368_enetsw_isr_dma(int irq
, void *dev_id
)
538 struct net_device
*dev
= dev_id
;
539 struct bcm6368_enetsw
*priv
= netdev_priv(dev
);
541 /* mask rx/tx interrupts */
542 dmac_writel(priv
, 0, DMAC_IRMASK_REG
, priv
->rx_chan
);
543 dmac_writel(priv
, 0, DMAC_IRMASK_REG
, priv
->tx_chan
);
545 napi_schedule(&priv
->napi
);
551 * tx request callback
554 bcm6368_enetsw_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
556 struct bcm6368_enetsw
*priv
= netdev_priv(dev
);
557 struct bcm6368_enetsw_desc
*desc
;
561 /* lock against tx reclaim */
562 spin_lock(&priv
->tx_lock
);
564 /* make sure the tx hw queue is not full, should not happen
565 * since we stop queue before it's the case */
566 if (unlikely(!priv
->tx_desc_count
)) {
567 netif_stop_queue(dev
);
568 dev_err(&priv
->pdev
->dev
, "xmit called with no tx desc "
570 ret
= NETDEV_TX_BUSY
;
574 /* pad small packets */
575 if (skb
->len
< (ETH_ZLEN
+ ETH_FCS_LEN
)) {
576 int needed
= (ETH_ZLEN
+ ETH_FCS_LEN
) - skb
->len
;
579 if (unlikely(skb_tailroom(skb
) < needed
)) {
580 struct sk_buff
*nskb
;
582 nskb
= skb_copy_expand(skb
, 0, needed
, GFP_ATOMIC
);
584 ret
= NETDEV_TX_BUSY
;
591 data
= skb_put_zero(skb
, needed
);
594 /* point to the next available desc */
595 desc
= &priv
->tx_desc_cpu
[priv
->tx_curr_desc
];
596 priv
->tx_skb
[priv
->tx_curr_desc
] = skb
;
598 /* fill descriptor */
599 desc
->address
= dma_map_single(&priv
->pdev
->dev
, skb
->data
, skb
->len
,
602 len_stat
= (skb
->len
<< DMADESC_LENGTH_SHIFT
) & DMADESC_LENGTH_MASK
;
603 len_stat
|= DMADESC_ESOP_MASK
| DMADESC_APPEND_CRC
|
606 priv
->tx_curr_desc
++;
607 if (priv
->tx_curr_desc
== priv
->tx_ring_size
) {
608 priv
->tx_curr_desc
= 0;
609 len_stat
|= DMADESC_WRAP_MASK
;
611 priv
->tx_desc_count
--;
613 /* dma might be already polling, make sure we update desc
614 * fields in correct order */
616 desc
->len_stat
= len_stat
;
620 dmac_writel(priv
, priv
->dma_chan_en_mask
, DMAC_CHANCFG_REG
,
623 /* stop queue if no more desc available */
624 if (!priv
->tx_desc_count
)
625 netif_stop_queue(dev
);
627 dev
->stats
.tx_bytes
+= skb
->len
;
628 dev
->stats
.tx_packets
++;
632 spin_unlock(&priv
->tx_lock
);
637 * disable dma in given channel
639 static void bcm6368_enetsw_disable_dma(struct bcm6368_enetsw
*priv
, int chan
)
643 dmac_writel(priv
, 0, DMAC_CHANCFG_REG
, chan
);
648 val
= dma_readl(priv
, DMAC_CHANCFG_REG
, chan
);
649 if (!(val
& DMAC_CHANCFG_EN_MASK
))
656 static int bcm6368_enetsw_open(struct net_device
*dev
)
658 struct bcm6368_enetsw
*priv
= netdev_priv(dev
);
659 struct device
*kdev
= &priv
->pdev
->dev
;
665 /* mask all interrupts and request them */
666 dmac_writel(priv
, 0, DMAC_IRMASK_REG
, priv
->rx_chan
);
667 dmac_writel(priv
, 0, DMAC_IRMASK_REG
, priv
->tx_chan
);
669 ret
= request_irq(priv
->irq_rx
, bcm6368_enetsw_isr_dma
,
674 if (priv
->irq_tx
!= -1) {
675 ret
= request_irq(priv
->irq_tx
, bcm6368_enetsw_isr_dma
,
681 /* allocate rx dma ring */
682 size
= priv
->rx_ring_size
* sizeof(struct bcm6368_enetsw_desc
);
683 p
= dma_alloc_coherent(kdev
, size
, &priv
->rx_desc_dma
, GFP_KERNEL
);
685 dev_err(kdev
, "cannot allocate rx ring %u\n", size
);
691 priv
->rx_desc_alloc_size
= size
;
692 priv
->rx_desc_cpu
= p
;
694 /* allocate tx dma ring */
695 size
= priv
->tx_ring_size
* sizeof(struct bcm6368_enetsw_desc
);
696 p
= dma_alloc_coherent(kdev
, size
, &priv
->tx_desc_dma
, GFP_KERNEL
);
698 dev_err(kdev
, "cannot allocate tx ring\n");
700 goto out_free_rx_ring
;
704 priv
->tx_desc_alloc_size
= size
;
705 priv
->tx_desc_cpu
= p
;
707 priv
->tx_skb
= kzalloc(sizeof(struct sk_buff
*) * priv
->tx_ring_size
,
710 dev_err(kdev
, "cannot allocate tx skb queue\n");
712 goto out_free_tx_ring
;
715 priv
->tx_desc_count
= priv
->tx_ring_size
;
716 priv
->tx_dirty_desc
= 0;
717 priv
->tx_curr_desc
= 0;
718 spin_lock_init(&priv
->tx_lock
);
720 /* init & fill rx ring with buffers */
721 priv
->rx_buf
= kzalloc(sizeof(unsigned char *) * priv
->rx_ring_size
,
724 dev_err(kdev
, "cannot allocate rx buffer queue\n");
726 goto out_free_tx_skb
;
729 priv
->rx_desc_count
= 0;
730 priv
->rx_dirty_desc
= 0;
731 priv
->rx_curr_desc
= 0;
733 /* initialize flow control buffer allocation */
734 dma_writel(priv
, DMA_BUFALLOC_FORCE_MASK
| 0,
735 DMA_BUFALLOC_REG(priv
->rx_chan
));
737 if (bcm6368_enetsw_refill_rx(dev
, false)) {
738 dev_err(kdev
, "cannot allocate rx buffer queue\n");
743 /* write rx & tx ring addresses */
744 dmas_writel(priv
, priv
->rx_desc_dma
,
745 DMAS_RSTART_REG
, priv
->rx_chan
);
746 dmas_writel(priv
, priv
->tx_desc_dma
,
747 DMAS_RSTART_REG
, priv
->tx_chan
);
749 /* clear remaining state ram for rx & tx channel */
750 dmas_writel(priv
, 0, DMAS_SRAM2_REG
, priv
->rx_chan
);
751 dmas_writel(priv
, 0, DMAS_SRAM2_REG
, priv
->tx_chan
);
752 dmas_writel(priv
, 0, DMAS_SRAM3_REG
, priv
->rx_chan
);
753 dmas_writel(priv
, 0, DMAS_SRAM3_REG
, priv
->tx_chan
);
754 dmas_writel(priv
, 0, DMAS_SRAM4_REG
, priv
->rx_chan
);
755 dmas_writel(priv
, 0, DMAS_SRAM4_REG
, priv
->tx_chan
);
757 /* set dma maximum burst len */
758 dmac_writel(priv
, priv
->dma_maxburst
,
759 DMAC_MAXBURST_REG
, priv
->rx_chan
);
760 dmac_writel(priv
, priv
->dma_maxburst
,
761 DMAC_MAXBURST_REG
, priv
->tx_chan
);
763 /* set flow control low/high threshold to 1/3 / 2/3 */
764 val
= priv
->rx_ring_size
/ 3;
765 dma_writel(priv
, val
, DMA_FLOWCL_REG(priv
->rx_chan
));
766 val
= (priv
->rx_ring_size
* 2) / 3;
767 dma_writel(priv
, val
, DMA_FLOWCH_REG(priv
->rx_chan
));
769 /* all set, enable mac and interrupts, start dma engine and
770 * kick rx dma channel
773 dma_writel(priv
, DMA_CFG_EN_MASK
, DMA_CFG_REG
);
774 dmac_writel(priv
, DMAC_CHANCFG_EN_MASK
,
775 DMAC_CHANCFG_REG
, priv
->rx_chan
);
777 /* watch "packet transferred" interrupt in rx and tx */
778 dmac_writel(priv
, DMAC_IR_PKTDONE_MASK
,
779 DMAC_IR_REG
, priv
->rx_chan
);
780 dmac_writel(priv
, DMAC_IR_PKTDONE_MASK
,
781 DMAC_IR_REG
, priv
->tx_chan
);
783 /* make sure we enable napi before rx interrupt */
784 napi_enable(&priv
->napi
);
786 dmac_writel(priv
, DMAC_IR_PKTDONE_MASK
,
787 DMAC_IRMASK_REG
, priv
->rx_chan
);
788 dmac_writel(priv
, DMAC_IR_PKTDONE_MASK
,
789 DMAC_IRMASK_REG
, priv
->tx_chan
);
791 netif_carrier_on(dev
);
792 netif_start_queue(dev
);
797 for (i
= 0; i
< priv
->rx_ring_size
; i
++) {
798 struct bcm6368_enetsw_desc
*desc
;
800 if (!priv
->rx_buf
[i
])
803 desc
= &priv
->rx_desc_cpu
[i
];
804 dma_unmap_single(kdev
, desc
->address
, priv
->rx_buf_size
,
806 skb_free_frag(priv
->rx_buf
[i
]);
814 dma_free_coherent(kdev
, priv
->tx_desc_alloc_size
,
815 priv
->tx_desc_cpu
, priv
->tx_desc_dma
);
818 dma_free_coherent(kdev
, priv
->rx_desc_alloc_size
,
819 priv
->rx_desc_cpu
, priv
->rx_desc_dma
);
822 if (priv
->irq_tx
!= -1)
823 free_irq(priv
->irq_tx
, dev
);
826 free_irq(priv
->irq_rx
, dev
);
832 static int bcm6368_enetsw_stop(struct net_device
*dev
)
834 struct bcm6368_enetsw
*priv
= netdev_priv(dev
);
835 struct device
*kdev
= &priv
->pdev
->dev
;
838 netif_stop_queue(dev
);
839 napi_disable(&priv
->napi
);
840 del_timer_sync(&priv
->rx_timeout
);
842 /* mask all interrupts */
843 dmac_writel(priv
, 0, DMAC_IRMASK_REG
, priv
->rx_chan
);
844 dmac_writel(priv
, 0, DMAC_IRMASK_REG
, priv
->tx_chan
);
846 /* disable dma & mac */
847 bcm6368_enetsw_disable_dma(priv
, priv
->tx_chan
);
848 bcm6368_enetsw_disable_dma(priv
, priv
->rx_chan
);
850 /* force reclaim of all tx buffers */
851 bcm6368_enetsw_tx_reclaim(dev
, 1);
853 /* free the rx buffer ring */
854 for (i
= 0; i
< priv
->rx_ring_size
; i
++) {
855 struct bcm6368_enetsw_desc
*desc
;
857 if (!priv
->rx_buf
[i
])
860 desc
= &priv
->rx_desc_cpu
[i
];
861 dma_unmap_single_attrs(kdev
, desc
->address
, priv
->rx_buf_size
,
863 DMA_ATTR_SKIP_CPU_SYNC
);
864 skb_free_frag(priv
->rx_buf
[i
]);
867 /* free remaining allocated memory */
870 dma_free_coherent(kdev
, priv
->rx_desc_alloc_size
,
871 priv
->rx_desc_cpu
, priv
->rx_desc_dma
);
872 dma_free_coherent(kdev
, priv
->tx_desc_alloc_size
,
873 priv
->tx_desc_cpu
, priv
->tx_desc_dma
);
874 if (priv
->irq_tx
!= -1)
875 free_irq(priv
->irq_tx
, dev
);
876 free_irq(priv
->irq_rx
, dev
);
881 static const struct net_device_ops bcm6368_enetsw_ops
= {
882 .ndo_open
= bcm6368_enetsw_open
,
883 .ndo_stop
= bcm6368_enetsw_stop
,
884 .ndo_start_xmit
= bcm6368_enetsw_start_xmit
,
887 static int bcm6368_enetsw_probe(struct platform_device
*pdev
)
889 struct bcm6368_enetsw
*priv
;
890 struct device
*dev
= &pdev
->dev
;
891 struct device_node
*node
= dev
->of_node
;
892 struct net_device
*ndev
;
893 struct resource
*res
;
897 ndev
= alloc_etherdev(sizeof(*priv
));
901 priv
= netdev_priv(ndev
);
903 priv
->num_pms
= of_count_phandle_with_args(node
, "power-domains",
904 "#power-domain-cells");
905 if (priv
->num_pms
> 1) {
906 priv
->pm
= devm_kcalloc(dev
, priv
->num_pms
,
907 sizeof(struct device
*), GFP_KERNEL
);
911 priv
->link_pm
= devm_kcalloc(dev
, priv
->num_pms
,
912 sizeof(struct device_link
*),
917 for (i
= 0; i
< priv
->num_pms
; i
++) {
918 priv
->pm
[i
] = genpd_dev_pm_attach_by_id(dev
, i
);
919 if (IS_ERR(priv
->pm
[i
])) {
920 dev_err(dev
, "error getting pm %d\n", i
);
924 priv
->link_pm
[i
] = device_link_add(dev
, priv
->pm
[i
],
925 DL_FLAG_STATELESS
| DL_FLAG_PM_RUNTIME
|
930 pm_runtime_enable(dev
);
931 pm_runtime_no_callbacks(dev
);
932 ret
= pm_runtime_get_sync(dev
);
934 pm_runtime_disable(dev
);
935 dev_info(dev
, "PM prober defer: ret=%d\n", ret
);
936 return -EPROBE_DEFER
;
939 res
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, "dma");
940 priv
->dma_base
= devm_ioremap_resource(dev
, res
);
941 if (IS_ERR(priv
->dma_base
))
942 return PTR_ERR(priv
->dma_base
);
944 res
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
,
946 priv
->dma_chan
= devm_ioremap_resource(dev
, res
);
947 if (IS_ERR(priv
->dma_chan
))
948 return PTR_ERR(priv
->dma_chan
);
950 res
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, "dma-sram");
951 priv
->dma_sram
= devm_ioremap_resource(dev
, res
);
952 if (IS_ERR(priv
->dma_sram
))
953 return PTR_ERR(priv
->dma_sram
);
955 priv
->irq_rx
= platform_get_irq_byname(pdev
, "rx");
959 priv
->irq_tx
= platform_get_irq_byname(pdev
, "tx");
962 else if (priv
->irq_tx
< 0)
965 if (device_property_read_u32(dev
, "dma-rx", &priv
->rx_chan
))
968 if (device_property_read_u32(dev
, "dma-tx", &priv
->tx_chan
))
971 priv
->rx_ring_size
= ENETSW_DEF_RX_DESC
;
972 priv
->tx_ring_size
= ENETSW_DEF_TX_DESC
;
974 priv
->dma_maxburst
= ENETSW_DMA_MAXBURST
;
976 priv
->copybreak
= ENETSW_DEF_CPY_BREAK
;
978 priv
->dma_chan_en_mask
= DMAC_CHANCFG_EN_MASK
;
979 priv
->dma_chan_int_mask
= DMAC_IR_PKTDONE_MASK
;
980 priv
->dma_chan_width
= DMA_CHAN_WIDTH
;
982 of_get_mac_address(node
, ndev
->dev_addr
);
983 if (is_valid_ether_addr(ndev
->dev_addr
)) {
984 dev_info(dev
, "mtd mac %pM\n", ndev
->dev_addr
);
986 random_ether_addr(ndev
->dev_addr
);
987 dev_info(dev
, "random mac %pM\n", ndev
->dev_addr
);
990 priv
->rx_buf_size
= ALIGN(ndev
->mtu
+ ENETSW_MTU_OVERHEAD
,
991 priv
->dma_maxburst
* 4);
993 priv
->rx_frag_size
= ENETSW_FRAG_SIZE(priv
->rx_buf_size
);
995 priv
->num_clocks
= of_clk_get_parent_count(node
);
996 if (priv
->num_clocks
) {
997 priv
->clock
= devm_kcalloc(dev
, priv
->num_clocks
,
998 sizeof(struct clk
*), GFP_KERNEL
);
1002 for (i
= 0; i
< priv
->num_clocks
; i
++) {
1003 priv
->clock
[i
] = of_clk_get(node
, i
);
1004 if (IS_ERR(priv
->clock
[i
])) {
1005 dev_err(dev
, "error getting clock %d\n", i
);
1009 ret
= clk_prepare_enable(priv
->clock
[i
]);
1011 dev_err(dev
, "error enabling clock %d\n", i
);
1016 priv
->num_resets
= of_count_phandle_with_args(node
, "resets",
1018 if (priv
->num_resets
) {
1019 priv
->reset
= devm_kcalloc(dev
, priv
->num_resets
,
1020 sizeof(struct reset_control
*),
1025 for (i
= 0; i
< priv
->num_resets
; i
++) {
1026 priv
->reset
[i
] = devm_reset_control_get_by_index(dev
, i
);
1027 if (IS_ERR(priv
->reset
[i
])) {
1028 dev_err(dev
, "error getting reset %d\n", i
);
1032 ret
= reset_control_reset(priv
->reset
[i
]);
1034 dev_err(dev
, "error performing reset %d\n", i
);
1039 spin_lock_init(&priv
->rx_lock
);
1041 timer_setup(&priv
->rx_timeout
, bcm6368_enetsw_refill_rx_timer
, 0);
1043 /* register netdevice */
1044 ndev
->netdev_ops
= &bcm6368_enetsw_ops
;
1045 ndev
->min_mtu
= ETH_ZLEN
;
1046 ndev
->mtu
= ETH_DATA_LEN
+ ENETSW_TAG_SIZE
;
1047 ndev
->max_mtu
= ETH_DATA_LEN
+ ENETSW_TAG_SIZE
;
1048 netif_napi_add(ndev
, &priv
->napi
, bcm6368_enetsw_poll
, 16);
1049 SET_NETDEV_DEV(ndev
, dev
);
1051 ret
= register_netdev(ndev
);
1053 goto out_disable_clk
;
1055 netif_carrier_off(ndev
);
1056 platform_set_drvdata(pdev
, ndev
);
1058 priv
->net_dev
= ndev
;
1063 for (i
= 0; i
< priv
->num_resets
; i
++)
1064 reset_control_assert(priv
->reset
[i
]);
1066 for (i
= 0; i
< priv
->num_clocks
; i
++)
1067 clk_disable_unprepare(priv
->clock
[i
]);
1072 static int bcm6368_enetsw_remove(struct platform_device
*pdev
)
1074 struct device
*dev
= &pdev
->dev
;
1075 struct net_device
*ndev
= platform_get_drvdata(pdev
);
1076 struct bcm6368_enetsw
*priv
= netdev_priv(ndev
);
1079 unregister_netdev(ndev
);
1081 pm_runtime_put_sync(dev
);
1082 for (i
= 0; priv
->pm
&& i
< priv
->num_pms
; i
++) {
1083 dev_pm_domain_detach(priv
->pm
[i
], true);
1084 device_link_del(priv
->link_pm
[i
]);
1087 for (i
= 0; i
< priv
->num_resets
; i
++)
1088 reset_control_assert(priv
->reset
[i
]);
1090 for (i
= 0; i
< priv
->num_clocks
; i
++)
1091 clk_disable_unprepare(priv
->clock
[i
]);
1098 static const struct of_device_id bcm6368_enetsw_of_match
[] = {
1099 { .compatible
= "brcm,bcm6318-enetsw", },
1100 { .compatible
= "brcm,bcm6328-enetsw", },
1101 { .compatible
= "brcm,bcm6362-enetsw", },
1102 { .compatible
= "brcm,bcm6368-enetsw", },
1103 { .compatible
= "brcm,bcm63268-enetsw", },
1106 MODULE_DEVICE_TABLE(of
, bcm6368_enetsw_of_match
);
1108 static struct platform_driver bcm6368_enetsw_driver
= {
1110 .name
= "bcm6368-enetsw",
1111 .of_match_table
= of_match_ptr(bcm6368_enetsw_of_match
),
1113 .probe
= bcm6368_enetsw_probe
,
1114 .remove
= bcm6368_enetsw_remove
,
1116 module_platform_driver(bcm6368_enetsw_driver
);