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) && (CONFIG_COMMANDS & (CFG_CMD_NET | CFG_CMD_MII))
23 * The u-boot networking stack is a little weird. It seems like the
24 * networking core allocates receive buffers up front without any
25 * regard to the hardware that's supposed to actually receive those
28 * The MACB receives packets into 128-byte receive buffers, so the
29 * buffers allocated by the core isn't very practical to use. We'll
30 * allocate our own, but we need one such buffer in case a packet
31 * wraps around the DMA ring so that we have to copy it.
33 * Therefore, define CFG_RX_ETH_BUFFER to 1 in the board-specific
34 * configuration header. This way, the core allocates one RX buffer
35 * and one TX buffer, each of which can hold a ethernet packet of
38 * For some reason, the networking core unconditionally specifies a
39 * 32-byte packet "alignment" (which really should be called
40 * "padding"). MACB shouldn't need that, but we'll refrain from any
41 * core modifications here...
47 #include <linux/mii.h>
49 #include <asm/dma-mapping.h>
50 #include <asm/arch/clk.h>
54 #define CFG_MACB_RX_BUFFER_SIZE 4096
55 #define CFG_MACB_RX_RING_SIZE (CFG_MACB_RX_BUFFER_SIZE / 128)
56 #define CFG_MACB_TX_RING_SIZE 16
57 #define CFG_MACB_TX_TIMEOUT 1000
58 #define CFG_MACB_AUTONEG_TIMEOUT 5000000
60 struct macb_dma_desc {
65 #define RXADDR_USED 0x00000001
66 #define RXADDR_WRAP 0x00000002
68 #define RXBUF_FRMLEN_MASK 0x00000fff
69 #define RXBUF_FRAME_START 0x00004000
70 #define RXBUF_FRAME_END 0x00008000
71 #define RXBUF_TYPEID_MATCH 0x00400000
72 #define RXBUF_ADDR4_MATCH 0x00800000
73 #define RXBUF_ADDR3_MATCH 0x01000000
74 #define RXBUF_ADDR2_MATCH 0x02000000
75 #define RXBUF_ADDR1_MATCH 0x04000000
76 #define RXBUF_BROADCAST 0x80000000
78 #define TXBUF_FRMLEN_MASK 0x000007ff
79 #define TXBUF_FRAME_END 0x00008000
80 #define TXBUF_NOCRC 0x00010000
81 #define TXBUF_EXHAUSTED 0x08000000
82 #define TXBUF_UNDERRUN 0x10000000
83 #define TXBUF_MAXRETRY 0x20000000
84 #define TXBUF_WRAP 0x40000000
85 #define TXBUF_USED 0x80000000
96 struct macb_dma_desc *rx_ring;
97 struct macb_dma_desc *tx_ring;
99 unsigned long rx_buffer_dma;
100 unsigned long rx_ring_dma;
101 unsigned long tx_ring_dma;
103 const struct device *dev;
104 struct eth_device netdev;
105 unsigned short phy_addr;
107 #define to_macb(_nd) container_of(_nd, struct macb_device, netdev)
109 static void macb_mdio_write(struct macb_device *macb, u8 reg, u16 value)
111 unsigned long netctl;
112 unsigned long netstat;
115 netctl = macb_readl(macb, NCR);
116 netctl |= MACB_BIT(MPE);
117 macb_writel(macb, NCR, netctl);
119 frame = (MACB_BF(SOF, 1)
121 | MACB_BF(PHYA, macb->phy_addr)
124 | MACB_BF(DATA, value));
125 macb_writel(macb, MAN, frame);
128 netstat = macb_readl(macb, NSR);
129 } while (!(netstat & MACB_BIT(IDLE)));
131 netctl = macb_readl(macb, NCR);
132 netctl &= ~MACB_BIT(MPE);
133 macb_writel(macb, NCR, netctl);
136 static u16 macb_mdio_read(struct macb_device *macb, u8 reg)
138 unsigned long netctl;
139 unsigned long netstat;
142 netctl = macb_readl(macb, NCR);
143 netctl |= MACB_BIT(MPE);
144 macb_writel(macb, NCR, netctl);
146 frame = (MACB_BF(SOF, 1)
148 | MACB_BF(PHYA, macb->phy_addr)
151 macb_writel(macb, MAN, frame);
154 netstat = macb_readl(macb, NSR);
155 } while (!(netstat & MACB_BIT(IDLE)));
157 frame = macb_readl(macb, MAN);
159 netctl = macb_readl(macb, NCR);
160 netctl &= ~MACB_BIT(MPE);
161 macb_writel(macb, NCR, netctl);
163 return MACB_BFEXT(DATA, frame);
166 #if (CONFIG_COMMANDS & CFG_CMD_NET)
168 static int macb_send(struct eth_device *netdev, volatile void *packet,
171 struct macb_device *macb = to_macb(netdev);
172 unsigned long paddr, ctrl;
173 unsigned int tx_head = macb->tx_head;
176 paddr = dma_map_single(packet, length, DMA_TO_DEVICE);
178 ctrl = length & TXBUF_FRMLEN_MASK;
179 ctrl |= TXBUF_FRAME_END;
180 if (tx_head == (CFG_MACB_TX_RING_SIZE - 1)) {
186 macb->tx_ring[tx_head].ctrl = ctrl;
187 macb->tx_ring[tx_head].addr = paddr;
188 macb_writel(macb, NCR, MACB_BIT(TE) | MACB_BIT(RE) | MACB_BIT(TSTART));
191 * I guess this is necessary because the networking core may
192 * re-use the transmit buffer as soon as we return...
195 while (!(macb->tx_ring[tx_head].ctrl & TXBUF_USED)) {
196 if (i > CFG_MACB_TX_TIMEOUT) {
197 printf("%s: TX timeout\n", netdev->name);
204 dma_unmap_single(packet, length, paddr);
206 if (i <= CFG_MACB_TX_TIMEOUT) {
207 ctrl = macb->tx_ring[tx_head].ctrl;
208 if (ctrl & TXBUF_UNDERRUN)
209 printf("%s: TX underrun\n", netdev->name);
210 if (ctrl & TXBUF_EXHAUSTED)
211 printf("%s: TX buffers exhausted in mid frame\n",
215 /* No one cares anyway */
219 static void reclaim_rx_buffers(struct macb_device *macb,
220 unsigned int new_tail)
225 while (i > new_tail) {
226 macb->rx_ring[i].addr &= ~RXADDR_USED;
228 if (i > CFG_MACB_RX_RING_SIZE)
232 while (i < new_tail) {
233 macb->rx_ring[i].addr &= ~RXADDR_USED;
237 macb->rx_tail = new_tail;
240 static int macb_recv(struct eth_device *netdev)
242 struct macb_device *macb = to_macb(netdev);
243 unsigned int rx_tail = macb->rx_tail;
250 if (!(macb->rx_ring[rx_tail].addr & RXADDR_USED))
253 status = macb->rx_ring[rx_tail].ctrl;
254 if (status & RXBUF_FRAME_START) {
255 if (rx_tail != macb->rx_tail)
256 reclaim_rx_buffers(macb, rx_tail);
260 if (status & RXBUF_FRAME_END) {
261 buffer = macb->rx_buffer + 128 * macb->rx_tail;
262 length = status & RXBUF_FRMLEN_MASK;
264 unsigned int headlen, taillen;
266 headlen = 128 * (CFG_MACB_RX_RING_SIZE
268 taillen = length - headlen;
269 memcpy((void *)NetRxPackets[0],
271 memcpy((void *)NetRxPackets[0] + headlen,
272 macb->rx_buffer, taillen);
273 buffer = (void *)NetRxPackets[0];
276 NetReceive(buffer, length);
277 if (++rx_tail >= CFG_MACB_RX_RING_SIZE)
279 reclaim_rx_buffers(macb, rx_tail);
281 if (++rx_tail >= CFG_MACB_RX_RING_SIZE) {
291 static int macb_phy_init(struct macb_device *macb)
293 struct eth_device *netdev = &macb->netdev;
295 u16 phy_id, status, adv, lpa;
296 int media, speed, duplex;
299 /* Check if the PHY is up to snuff... */
300 phy_id = macb_mdio_read(macb, MII_PHYSID1);
301 if (phy_id == 0xffff) {
302 printf("%s: No PHY present\n", netdev->name);
306 adv = ADVERTISE_CSMA | ADVERTISE_ALL;
307 macb_mdio_write(macb, MII_ADVERTISE, adv);
308 printf("%s: Starting autonegotiation...\n", netdev->name);
309 macb_mdio_write(macb, MII_BMCR, (BMCR_ANENABLE
313 for (i = 0; i < 9; i++)
314 printf("mii%d: 0x%04x\n", i, macb_mdio_read(macb, i));
317 for (i = 0; i < CFG_MACB_AUTONEG_TIMEOUT / 100; i++) {
318 status = macb_mdio_read(macb, MII_BMSR);
319 if (status & BMSR_ANEGCOMPLETE)
324 if (status & BMSR_ANEGCOMPLETE)
325 printf("%s: Autonegotiation complete\n", netdev->name);
327 printf("%s: Autonegotiation timed out (status=0x%04x)\n",
328 netdev->name, status);
330 if (!(status & BMSR_LSTATUS)) {
331 for (i = 0; i < CFG_MACB_AUTONEG_TIMEOUT / 100; i++) {
333 status = macb_mdio_read(macb, MII_BMSR);
334 if (status & BMSR_LSTATUS)
339 if (!(status & BMSR_LSTATUS)) {
340 printf("%s: link down (status: 0x%04x)\n",
341 netdev->name, status);
344 lpa = macb_mdio_read(macb, MII_LPA);
345 media = mii_nway_result(lpa & adv);
346 speed = (media & (ADVERTISE_100FULL | ADVERTISE_100HALF)
348 duplex = (media & ADVERTISE_FULL) ? 1 : 0;
349 printf("%s: link up, %sMbps %s-duplex (lpa: 0x%04x)\n",
351 speed ? "100" : "10",
352 duplex ? "full" : "half",
355 ncfgr = macb_readl(macb, NCFGR);
356 ncfgr &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
358 ncfgr |= MACB_BIT(SPD);
360 ncfgr |= MACB_BIT(FD);
361 macb_writel(macb, NCFGR, ncfgr);
366 static int macb_init(struct eth_device *netdev, bd_t *bd)
368 struct macb_device *macb = to_macb(netdev);
375 * macb_halt should have been called at some point before now,
376 * so we'll assume the controller is idle.
379 /* initialize DMA descriptors */
380 paddr = macb->rx_buffer_dma;
381 for (i = 0; i < CFG_MACB_RX_RING_SIZE; i++) {
382 if (i == (CFG_MACB_RX_RING_SIZE - 1))
383 paddr |= RXADDR_WRAP;
384 macb->rx_ring[i].addr = paddr;
385 macb->rx_ring[i].ctrl = 0;
388 for (i = 0; i < CFG_MACB_TX_RING_SIZE; i++) {
389 macb->tx_ring[i].addr = 0;
390 if (i == (CFG_MACB_TX_RING_SIZE - 1))
391 macb->tx_ring[i].ctrl = TXBUF_USED | TXBUF_WRAP;
393 macb->tx_ring[i].ctrl = TXBUF_USED;
395 macb->rx_tail = macb->tx_head = macb->tx_tail = 0;
397 macb_writel(macb, RBQP, macb->rx_ring_dma);
398 macb_writel(macb, TBQP, macb->tx_ring_dma);
400 /* set hardware address */
401 hwaddr_bottom = cpu_to_le32(*((u32 *)netdev->enetaddr));
402 macb_writel(macb, SA1B, hwaddr_bottom);
403 hwaddr_top = cpu_to_le16(*((u16 *)(netdev->enetaddr + 4)));
404 macb_writel(macb, SA1T, hwaddr_top);
406 /* choose RMII or MII mode. This depends on the board */
408 macb_writel(macb, USRIO, 0);
410 macb_writel(macb, USRIO, MACB_BIT(MII));
413 if (!macb_phy_init(macb))
416 /* Enable TX and RX */
417 macb_writel(macb, NCR, MACB_BIT(TE) | MACB_BIT(RE));
422 static void macb_halt(struct eth_device *netdev)
424 struct macb_device *macb = to_macb(netdev);
427 /* Halt the controller and wait for any ongoing transmission to end. */
428 ncr = macb_readl(macb, NCR);
429 ncr |= MACB_BIT(THALT);
430 macb_writel(macb, NCR, ncr);
433 tsr = macb_readl(macb, TSR);
434 } while (tsr & MACB_BIT(TGO));
436 /* Disable TX and RX, and clear statistics */
437 macb_writel(macb, NCR, MACB_BIT(CLRSTAT));
440 int macb_eth_initialize(int id, void *regs, unsigned int phy_addr)
442 struct macb_device *macb;
443 struct eth_device *netdev;
444 unsigned long macb_hz;
447 macb = malloc(sizeof(struct macb_device));
449 printf("Error: Failed to allocate memory for MACB%d\n", id);
452 memset(macb, 0, sizeof(struct macb_device));
454 netdev = &macb->netdev;
456 macb->rx_buffer = dma_alloc_coherent(CFG_MACB_RX_BUFFER_SIZE,
457 &macb->rx_buffer_dma);
458 macb->rx_ring = dma_alloc_coherent(CFG_MACB_RX_RING_SIZE
459 * sizeof(struct macb_dma_desc),
461 macb->tx_ring = dma_alloc_coherent(CFG_MACB_TX_RING_SIZE
462 * sizeof(struct macb_dma_desc),
466 macb->phy_addr = phy_addr;
468 sprintf(netdev->name, "macb%d", id);
469 netdev->init = macb_init;
470 netdev->halt = macb_halt;
471 netdev->send = macb_send;
472 netdev->recv = macb_recv;
475 * Do some basic initialization so that we at least can talk
478 macb_hz = get_macb_pclk_rate(id);
479 if (macb_hz < 20000000)
480 ncfgr = MACB_BF(CLK, MACB_CLK_DIV8);
481 else if (macb_hz < 40000000)
482 ncfgr = MACB_BF(CLK, MACB_CLK_DIV16);
483 else if (macb_hz < 80000000)
484 ncfgr = MACB_BF(CLK, MACB_CLK_DIV32);
486 ncfgr = MACB_BF(CLK, MACB_CLK_DIV64);
488 macb_writel(macb, NCFGR, ncfgr);
490 eth_register(netdev);
495 #endif /* (CONFIG_COMMANDS & CFG_CMD_NET) */
497 #if (CONFIG_COMMANDS & CFG_CMD_MII)
499 int miiphy_read(unsigned char addr, unsigned char reg, unsigned short *value)
501 unsigned long netctl;
502 unsigned long netstat;
506 iflag = disable_interrupts();
507 netctl = macb_readl(&macb, EMACB_NCR);
508 netctl |= MACB_BIT(MPE);
509 macb_writel(&macb, EMACB_NCR, netctl);
513 frame = (MACB_BF(SOF, 1)
515 | MACB_BF(PHYA, addr)
518 macb_writel(&macb, EMACB_MAN, frame);
521 netstat = macb_readl(&macb, EMACB_NSR);
522 } while (!(netstat & MACB_BIT(IDLE)));
524 frame = macb_readl(&macb, EMACB_MAN);
525 *value = MACB_BFEXT(DATA, frame);
527 iflag = disable_interrupts();
528 netctl = macb_readl(&macb, EMACB_NCR);
529 netctl &= ~MACB_BIT(MPE);
530 macb_writel(&macb, EMACB_NCR, netctl);
537 int miiphy_write(unsigned char addr, unsigned char reg, unsigned short value)
539 unsigned long netctl;
540 unsigned long netstat;
544 iflag = disable_interrupts();
545 netctl = macb_readl(&macb, EMACB_NCR);
546 netctl |= MACB_BIT(MPE);
547 macb_writel(&macb, EMACB_NCR, netctl);
551 frame = (MACB_BF(SOF, 1)
553 | MACB_BF(PHYA, addr)
556 | MACB_BF(DATA, value));
557 macb_writel(&macb, EMACB_MAN, frame);
560 netstat = macb_readl(&macb, EMACB_NSR);
561 } while (!(netstat & MACB_BIT(IDLE)));
563 iflag = disable_interrupts();
564 netctl = macb_readl(&macb, EMACB_NCR);
565 netctl &= ~MACB_BIT(MPE);
566 macb_writel(&macb, EMACB_NCR, netctl);
573 #endif /* (CONFIG_COMMANDS & CFG_CMD_MII) */
575 #endif /* CONFIG_MACB */