2 * Copyright (C) 2005-2006 Atmel Corporation
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #if defined(CONFIG_MACB) \
21 && (defined(CONFIG_CMD_NET) || defined(CONFIG_CMD_MII))
24 * The u-boot networking stack is a little weird. It seems like the
25 * networking core allocates receive buffers up front without any
26 * regard to the hardware that's supposed to actually receive those
29 * The MACB receives packets into 128-byte receive buffers, so the
30 * buffers allocated by the core isn't very practical to use. We'll
31 * allocate our own, but we need one such buffer in case a packet
32 * wraps around the DMA ring so that we have to copy it.
34 * Therefore, define CFG_RX_ETH_BUFFER to 1 in the board-specific
35 * configuration header. This way, the core allocates one RX buffer
36 * and one TX buffer, each of which can hold a ethernet packet of
39 * For some reason, the networking core unconditionally specifies a
40 * 32-byte packet "alignment" (which really should be called
41 * "padding"). MACB shouldn't need that, but we'll refrain from any
42 * core modifications here...
48 #include <linux/mii.h>
50 #include <asm/dma-mapping.h>
51 #include <asm/arch/clk.h>
55 #define barrier() asm volatile("" ::: "memory")
57 #define CFG_MACB_RX_BUFFER_SIZE 4096
58 #define CFG_MACB_RX_RING_SIZE (CFG_MACB_RX_BUFFER_SIZE / 128)
59 #define CFG_MACB_TX_RING_SIZE 16
60 #define CFG_MACB_TX_TIMEOUT 1000
61 #define CFG_MACB_AUTONEG_TIMEOUT 5000000
63 struct macb_dma_desc {
68 #define RXADDR_USED 0x00000001
69 #define RXADDR_WRAP 0x00000002
71 #define RXBUF_FRMLEN_MASK 0x00000fff
72 #define RXBUF_FRAME_START 0x00004000
73 #define RXBUF_FRAME_END 0x00008000
74 #define RXBUF_TYPEID_MATCH 0x00400000
75 #define RXBUF_ADDR4_MATCH 0x00800000
76 #define RXBUF_ADDR3_MATCH 0x01000000
77 #define RXBUF_ADDR2_MATCH 0x02000000
78 #define RXBUF_ADDR1_MATCH 0x04000000
79 #define RXBUF_BROADCAST 0x80000000
81 #define TXBUF_FRMLEN_MASK 0x000007ff
82 #define TXBUF_FRAME_END 0x00008000
83 #define TXBUF_NOCRC 0x00010000
84 #define TXBUF_EXHAUSTED 0x08000000
85 #define TXBUF_UNDERRUN 0x10000000
86 #define TXBUF_MAXRETRY 0x20000000
87 #define TXBUF_WRAP 0x40000000
88 #define TXBUF_USED 0x80000000
99 struct macb_dma_desc *rx_ring;
100 struct macb_dma_desc *tx_ring;
102 unsigned long rx_buffer_dma;
103 unsigned long rx_ring_dma;
104 unsigned long tx_ring_dma;
106 const struct device *dev;
107 struct eth_device netdev;
108 unsigned short phy_addr;
110 #define to_macb(_nd) container_of(_nd, struct macb_device, netdev)
112 static void macb_mdio_write(struct macb_device *macb, u8 reg, u16 value)
114 unsigned long netctl;
115 unsigned long netstat;
118 netctl = macb_readl(macb, NCR);
119 netctl |= MACB_BIT(MPE);
120 macb_writel(macb, NCR, netctl);
122 frame = (MACB_BF(SOF, 1)
124 | MACB_BF(PHYA, macb->phy_addr)
127 | MACB_BF(DATA, value));
128 macb_writel(macb, MAN, frame);
131 netstat = macb_readl(macb, NSR);
132 } while (!(netstat & MACB_BIT(IDLE)));
134 netctl = macb_readl(macb, NCR);
135 netctl &= ~MACB_BIT(MPE);
136 macb_writel(macb, NCR, netctl);
139 static u16 macb_mdio_read(struct macb_device *macb, u8 reg)
141 unsigned long netctl;
142 unsigned long netstat;
145 netctl = macb_readl(macb, NCR);
146 netctl |= MACB_BIT(MPE);
147 macb_writel(macb, NCR, netctl);
149 frame = (MACB_BF(SOF, 1)
151 | MACB_BF(PHYA, macb->phy_addr)
154 macb_writel(macb, MAN, frame);
157 netstat = macb_readl(macb, NSR);
158 } while (!(netstat & MACB_BIT(IDLE)));
160 frame = macb_readl(macb, MAN);
162 netctl = macb_readl(macb, NCR);
163 netctl &= ~MACB_BIT(MPE);
164 macb_writel(macb, NCR, netctl);
166 return MACB_BFEXT(DATA, frame);
169 #if defined(CONFIG_CMD_NET)
171 static int macb_send(struct eth_device *netdev, volatile void *packet,
174 struct macb_device *macb = to_macb(netdev);
175 unsigned long paddr, ctrl;
176 unsigned int tx_head = macb->tx_head;
179 paddr = dma_map_single(packet, length, DMA_TO_DEVICE);
181 ctrl = length & TXBUF_FRMLEN_MASK;
182 ctrl |= TXBUF_FRAME_END;
183 if (tx_head == (CFG_MACB_TX_RING_SIZE - 1)) {
189 macb->tx_ring[tx_head].ctrl = ctrl;
190 macb->tx_ring[tx_head].addr = paddr;
192 macb_writel(macb, NCR, MACB_BIT(TE) | MACB_BIT(RE) | MACB_BIT(TSTART));
195 * I guess this is necessary because the networking core may
196 * re-use the transmit buffer as soon as we return...
198 for (i = 0; i <= CFG_MACB_TX_TIMEOUT; i++) {
200 ctrl = macb->tx_ring[tx_head].ctrl;
201 if (ctrl & TXBUF_USED)
206 dma_unmap_single(packet, length, paddr);
208 if (i <= CFG_MACB_TX_TIMEOUT) {
209 if (ctrl & TXBUF_UNDERRUN)
210 printf("%s: TX underrun\n", netdev->name);
211 if (ctrl & TXBUF_EXHAUSTED)
212 printf("%s: TX buffers exhausted in mid frame\n",
215 printf("%s: TX timeout\n", netdev->name);
218 /* No one cares anyway */
222 static void reclaim_rx_buffers(struct macb_device *macb,
223 unsigned int new_tail)
228 while (i > new_tail) {
229 macb->rx_ring[i].addr &= ~RXADDR_USED;
231 if (i > CFG_MACB_RX_RING_SIZE)
235 while (i < new_tail) {
236 macb->rx_ring[i].addr &= ~RXADDR_USED;
241 macb->rx_tail = new_tail;
244 static int macb_recv(struct eth_device *netdev)
246 struct macb_device *macb = to_macb(netdev);
247 unsigned int rx_tail = macb->rx_tail;
254 if (!(macb->rx_ring[rx_tail].addr & RXADDR_USED))
257 status = macb->rx_ring[rx_tail].ctrl;
258 if (status & RXBUF_FRAME_START) {
259 if (rx_tail != macb->rx_tail)
260 reclaim_rx_buffers(macb, rx_tail);
264 if (status & RXBUF_FRAME_END) {
265 buffer = macb->rx_buffer + 128 * macb->rx_tail;
266 length = status & RXBUF_FRMLEN_MASK;
268 unsigned int headlen, taillen;
270 headlen = 128 * (CFG_MACB_RX_RING_SIZE
272 taillen = length - headlen;
273 memcpy((void *)NetRxPackets[0],
275 memcpy((void *)NetRxPackets[0] + headlen,
276 macb->rx_buffer, taillen);
277 buffer = (void *)NetRxPackets[0];
280 NetReceive(buffer, length);
281 if (++rx_tail >= CFG_MACB_RX_RING_SIZE)
283 reclaim_rx_buffers(macb, rx_tail);
285 if (++rx_tail >= CFG_MACB_RX_RING_SIZE) {
296 static void macb_phy_reset(struct macb_device *macb)
298 struct eth_device *netdev = &macb->netdev;
302 adv = ADVERTISE_CSMA | ADVERTISE_ALL;
303 macb_mdio_write(macb, MII_ADVERTISE, adv);
304 printf("%s: Starting autonegotiation...\n", netdev->name);
305 macb_mdio_write(macb, MII_BMCR, (BMCR_ANENABLE
308 for (i = 0; i < CFG_MACB_AUTONEG_TIMEOUT / 100; i++) {
309 status = macb_mdio_read(macb, MII_BMSR);
310 if (status & BMSR_ANEGCOMPLETE)
315 if (status & BMSR_ANEGCOMPLETE)
316 printf("%s: Autonegotiation complete\n", netdev->name);
318 printf("%s: Autonegotiation timed out (status=0x%04x)\n",
319 netdev->name, status);
322 static int macb_phy_init(struct macb_device *macb)
324 struct eth_device *netdev = &macb->netdev;
326 u16 phy_id, status, adv, lpa;
327 int media, speed, duplex;
330 /* Check if the PHY is up to snuff... */
331 phy_id = macb_mdio_read(macb, MII_PHYSID1);
332 if (phy_id == 0xffff) {
333 printf("%s: No PHY present\n", netdev->name);
337 status = macb_mdio_read(macb, MII_BMSR);
338 if (!(status & BMSR_LSTATUS)) {
339 /* Try to re-negotiate if we don't have link already. */
340 macb_phy_reset(macb);
342 for (i = 0; i < CFG_MACB_AUTONEG_TIMEOUT / 100; i++) {
343 status = macb_mdio_read(macb, MII_BMSR);
344 if (status & BMSR_LSTATUS)
350 if (!(status & BMSR_LSTATUS)) {
351 printf("%s: link down (status: 0x%04x)\n",
352 netdev->name, status);
355 adv = macb_mdio_read(macb, MII_ADVERTISE);
356 lpa = macb_mdio_read(macb, MII_LPA);
357 media = mii_nway_result(lpa & adv);
358 speed = (media & (ADVERTISE_100FULL | ADVERTISE_100HALF)
360 duplex = (media & ADVERTISE_FULL) ? 1 : 0;
361 printf("%s: link up, %sMbps %s-duplex (lpa: 0x%04x)\n",
363 speed ? "100" : "10",
364 duplex ? "full" : "half",
367 ncfgr = macb_readl(macb, NCFGR);
368 ncfgr &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
370 ncfgr |= MACB_BIT(SPD);
372 ncfgr |= MACB_BIT(FD);
373 macb_writel(macb, NCFGR, ncfgr);
378 static int macb_init(struct eth_device *netdev, bd_t *bd)
380 struct macb_device *macb = to_macb(netdev);
387 * macb_halt should have been called at some point before now,
388 * so we'll assume the controller is idle.
391 /* initialize DMA descriptors */
392 paddr = macb->rx_buffer_dma;
393 for (i = 0; i < CFG_MACB_RX_RING_SIZE; i++) {
394 if (i == (CFG_MACB_RX_RING_SIZE - 1))
395 paddr |= RXADDR_WRAP;
396 macb->rx_ring[i].addr = paddr;
397 macb->rx_ring[i].ctrl = 0;
400 for (i = 0; i < CFG_MACB_TX_RING_SIZE; i++) {
401 macb->tx_ring[i].addr = 0;
402 if (i == (CFG_MACB_TX_RING_SIZE - 1))
403 macb->tx_ring[i].ctrl = TXBUF_USED | TXBUF_WRAP;
405 macb->tx_ring[i].ctrl = TXBUF_USED;
407 macb->rx_tail = macb->tx_head = macb->tx_tail = 0;
409 macb_writel(macb, RBQP, macb->rx_ring_dma);
410 macb_writel(macb, TBQP, macb->tx_ring_dma);
412 /* set hardware address */
413 hwaddr_bottom = cpu_to_le32(*((u32 *)netdev->enetaddr));
414 macb_writel(macb, SA1B, hwaddr_bottom);
415 hwaddr_top = cpu_to_le16(*((u16 *)(netdev->enetaddr + 4)));
416 macb_writel(macb, SA1T, hwaddr_top);
418 /* choose RMII or MII mode. This depends on the board */
420 macb_writel(macb, USRIO, 0);
422 macb_writel(macb, USRIO, MACB_BIT(MII));
425 if (!macb_phy_init(macb))
428 /* Enable TX and RX */
429 macb_writel(macb, NCR, MACB_BIT(TE) | MACB_BIT(RE));
434 static void macb_halt(struct eth_device *netdev)
436 struct macb_device *macb = to_macb(netdev);
439 /* Halt the controller and wait for any ongoing transmission to end. */
440 ncr = macb_readl(macb, NCR);
441 ncr |= MACB_BIT(THALT);
442 macb_writel(macb, NCR, ncr);
445 tsr = macb_readl(macb, TSR);
446 } while (tsr & MACB_BIT(TGO));
448 /* Disable TX and RX, and clear statistics */
449 macb_writel(macb, NCR, MACB_BIT(CLRSTAT));
452 int macb_eth_initialize(int id, void *regs, unsigned int phy_addr)
454 struct macb_device *macb;
455 struct eth_device *netdev;
456 unsigned long macb_hz;
459 macb = malloc(sizeof(struct macb_device));
461 printf("Error: Failed to allocate memory for MACB%d\n", id);
464 memset(macb, 0, sizeof(struct macb_device));
466 netdev = &macb->netdev;
468 macb->rx_buffer = dma_alloc_coherent(CFG_MACB_RX_BUFFER_SIZE,
469 &macb->rx_buffer_dma);
470 macb->rx_ring = dma_alloc_coherent(CFG_MACB_RX_RING_SIZE
471 * sizeof(struct macb_dma_desc),
473 macb->tx_ring = dma_alloc_coherent(CFG_MACB_TX_RING_SIZE
474 * sizeof(struct macb_dma_desc),
478 macb->phy_addr = phy_addr;
480 sprintf(netdev->name, "macb%d", id);
481 netdev->init = macb_init;
482 netdev->halt = macb_halt;
483 netdev->send = macb_send;
484 netdev->recv = macb_recv;
487 * Do some basic initialization so that we at least can talk
490 macb_hz = get_macb_pclk_rate(id);
491 if (macb_hz < 20000000)
492 ncfgr = MACB_BF(CLK, MACB_CLK_DIV8);
493 else if (macb_hz < 40000000)
494 ncfgr = MACB_BF(CLK, MACB_CLK_DIV16);
495 else if (macb_hz < 80000000)
496 ncfgr = MACB_BF(CLK, MACB_CLK_DIV32);
498 ncfgr = MACB_BF(CLK, MACB_CLK_DIV64);
500 macb_writel(macb, NCFGR, ncfgr);
502 eth_register(netdev);
509 #if defined(CONFIG_CMD_MII)
511 int miiphy_read(unsigned char addr, unsigned char reg, unsigned short *value)
513 unsigned long netctl;
514 unsigned long netstat;
518 iflag = disable_interrupts();
519 netctl = macb_readl(&macb, EMACB_NCR);
520 netctl |= MACB_BIT(MPE);
521 macb_writel(&macb, EMACB_NCR, netctl);
525 frame = (MACB_BF(SOF, 1)
527 | MACB_BF(PHYA, addr)
530 macb_writel(&macb, EMACB_MAN, frame);
533 netstat = macb_readl(&macb, EMACB_NSR);
534 } while (!(netstat & MACB_BIT(IDLE)));
536 frame = macb_readl(&macb, EMACB_MAN);
537 *value = MACB_BFEXT(DATA, frame);
539 iflag = disable_interrupts();
540 netctl = macb_readl(&macb, EMACB_NCR);
541 netctl &= ~MACB_BIT(MPE);
542 macb_writel(&macb, EMACB_NCR, netctl);
549 int miiphy_write(unsigned char addr, unsigned char reg, unsigned short value)
551 unsigned long netctl;
552 unsigned long netstat;
556 iflag = disable_interrupts();
557 netctl = macb_readl(&macb, EMACB_NCR);
558 netctl |= MACB_BIT(MPE);
559 macb_writel(&macb, EMACB_NCR, netctl);
563 frame = (MACB_BF(SOF, 1)
565 | MACB_BF(PHYA, addr)
568 | MACB_BF(DATA, value));
569 macb_writel(&macb, EMACB_MAN, frame);
572 netstat = macb_readl(&macb, EMACB_NSR);
573 } while (!(netstat & MACB_BIT(IDLE)));
575 iflag = disable_interrupts();
576 netctl = macb_readl(&macb, EMACB_NCR);
577 netctl &= ~MACB_BIT(MPE);
578 macb_writel(&macb, EMACB_NCR, netctl);
587 #endif /* CONFIG_MACB */