[mirror_qemu.git] / hw / etraxfs_eth.c

/*
 * QEMU ETRAX Ethernet Controller.
 *
 * Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <stdio.h>
#include "hw.h"
#include "net.h"

#include "etraxfs_dma.h"

#define D(x)

/* Advertisement control register. */
#define ADVERTISE_10HALF        0x0020  /* Try for 10mbps half-duplex  */
#define ADVERTISE_10FULL        0x0040  /* Try for 10mbps full-duplex  */
#define ADVERTISE_100HALF       0x0080  /* Try for 100mbps half-duplex */
#define ADVERTISE_100FULL       0x0100  /* Try for 100mbps full-duplex */

/* 
 * The MDIO extensions in the TDK PHY model were reversed engineered from the 
 * linux driver (PHYID and Diagnostics reg).
 * TODO: Add friendly names for the register nums.
 */
struct qemu_phy
{
	uint32_t regs[32];

	unsigned int (*read)(struct qemu_phy *phy, unsigned int req);
	void (*write)(struct qemu_phy *phy, unsigned int req, 
		      unsigned int data);
};

static unsigned int tdk_read(struct qemu_phy *phy, unsigned int req)
{
	int regnum;
	unsigned r = 0;

	regnum = req & 0x1f;

	switch (regnum) {
		case 1:
			/* MR1.	 */
			/* Speeds and modes.  */
			r |= (1 << 13) | (1 << 14);
			r |= (1 << 11) | (1 << 12);
			r |= (1 << 5); /* Autoneg complete.  */
			r |= (1 << 3); /* Autoneg able.	 */
			r |= (1 << 2); /* Link.	 */
			break;
		case 5:
			/* Link partner ability.
			   We are kind; always agree with whatever best mode
			   the guest advertises.  */
			r = 1 << 14; /* Success.  */
			/* Copy advertised modes.  */
			r |= phy->regs[4] & (15 << 5);
			/* Autoneg support.  */
			r |= 1;
			break;
		case 18:
		{
			/* Diagnostics reg.  */
			int duplex = 0;
			int speed_100 = 0;

			/* Are we advertising 100 half or 100 duplex ? */
			speed_100 = !!(phy->regs[4] & ADVERTISE_100HALF);
			speed_100 |= !!(phy->regs[4] & ADVERTISE_100FULL);

			/* Are we advertising 10 duplex or 100 duplex ? */
			duplex = !!(phy->regs[4] & ADVERTISE_100FULL);
			duplex |= !!(phy->regs[4] & ADVERTISE_10FULL);
			r = (speed_100 << 10) | (duplex << 11);
		}
		break;

		default:
			r = phy->regs[regnum];
			break;
	}
	D(printf("\n%s %x = reg[%d]\n", __func__, r, regnum));
	return r;
}

static void 
tdk_write(struct qemu_phy *phy, unsigned int req, unsigned int data)
{
	int regnum;

	regnum = req & 0x1f;
	D(printf("%s reg[%d] = %x\n", __func__, regnum, data));
	switch (regnum) {
		default:
			phy->regs[regnum] = data;
			break;
	}
}

static void 
tdk_init(struct qemu_phy *phy)
{
	phy->regs[0] = 0x3100;
	/* PHY Id.  */
	phy->regs[2] = 0x0300;
	phy->regs[3] = 0xe400;
	/* Autonegotiation advertisement reg.  */
	phy->regs[4] = 0x01E1;

	phy->read = tdk_read;
	phy->write = tdk_write;
}

struct qemu_mdio
{
	/* bus.	 */
	int mdc;
	int mdio;

	/* decoder.  */
	enum {
		PREAMBLE,
		SOF,
		OPC,
		ADDR,
		REQ,
		TURNAROUND,
		DATA
	} state;
	unsigned int drive;

	unsigned int cnt;
	unsigned int addr;
	unsigned int opc;
	unsigned int req;
	unsigned int data;

	struct qemu_phy *devs[32];
};

static void 
mdio_attach(struct qemu_mdio *bus, struct qemu_phy *phy, unsigned int addr)
{
	bus->devs[addr & 0x1f] = phy;
}

#ifdef USE_THIS_DEAD_CODE
static void 
mdio_detach(struct qemu_mdio *bus, struct qemu_phy *phy, unsigned int addr)
{
	bus->devs[addr & 0x1f] = NULL;	
}
#endif

static void mdio_read_req(struct qemu_mdio *bus)
{
	struct qemu_phy *phy;

	phy = bus->devs[bus->addr];
	if (phy && phy->read)
		bus->data = phy->read(phy, bus->req);
	else 
		bus->data = 0xffff;
}

static void mdio_write_req(struct qemu_mdio *bus)
{
	struct qemu_phy *phy;

	phy = bus->devs[bus->addr];
	if (phy && phy->write)
		phy->write(phy, bus->req, bus->data);
}

static void mdio_cycle(struct qemu_mdio *bus)
{
	bus->cnt++;

	D(printf("mdc=%d mdio=%d state=%d cnt=%d drv=%d\n",
		bus->mdc, bus->mdio, bus->state, bus->cnt, bus->drive));
#if 0
	if (bus->mdc)
		printf("%d", bus->mdio);
#endif
	switch (bus->state)
	{
		case PREAMBLE:
			if (bus->mdc) {
				if (bus->cnt >= (32 * 2) && !bus->mdio) {
					bus->cnt = 0;
					bus->state = SOF;
					bus->data = 0;
				}
			}
			break;
		case SOF:
			if (bus->mdc) {
				if (bus->mdio != 1)
					printf("WARNING: no SOF\n");
				if (bus->cnt == 1*2) {
					bus->cnt = 0;
					bus->opc = 0;
					bus->state = OPC;
				}
			}
			break;
		case OPC:
			if (bus->mdc) {
				bus->opc <<= 1;
				bus->opc |= bus->mdio & 1;
				if (bus->cnt == 2*2) {
					bus->cnt = 0;
					bus->addr = 0;
					bus->state = ADDR;
				}
			}
			break;
		case ADDR:
			if (bus->mdc) {
				bus->addr <<= 1;
				bus->addr |= bus->mdio & 1;

				if (bus->cnt == 5*2) {
					bus->cnt = 0;
					bus->req = 0;
					bus->state = REQ;
				}
			}
			break;
		case REQ:
			if (bus->mdc) {
				bus->req <<= 1;
				bus->req |= bus->mdio & 1;
				if (bus->cnt == 5*2) {
					bus->cnt = 0;
					bus->state = TURNAROUND;
				}
			}
			break;
		case TURNAROUND:
			if (bus->mdc && bus->cnt == 2*2) {
				bus->mdio = 0;
				bus->cnt = 0;

				if (bus->opc == 2) {
					bus->drive = 1;
					mdio_read_req(bus);
					bus->mdio = bus->data & 1;
				}
				bus->state = DATA;
			}
			break;
		case DATA:			
			if (!bus->mdc) {
				if (bus->drive) {
					bus->mdio = !!(bus->data & (1 << 15));
					bus->data <<= 1;
				}
			} else {
				if (!bus->drive) {
					bus->data <<= 1;
					bus->data |= bus->mdio;
				}
				if (bus->cnt == 16 * 2) {
					bus->cnt = 0;
					bus->state = PREAMBLE;
					if (!bus->drive)
						mdio_write_req(bus);
					bus->drive = 0;
				}
			}
			break;
		default:
			break;
	}
}

/* ETRAX-FS Ethernet MAC block starts here.  */

#define RW_MA0_LO	  0x00
#define RW_MA0_HI	  0x04
#define RW_MA1_LO	  0x08
#define RW_MA1_HI	  0x0c
#define RW_GA_LO	  0x10
#define RW_GA_HI	  0x14
#define RW_GEN_CTRL	  0x18
#define RW_REC_CTRL	  0x1c
#define RW_TR_CTRL	  0x20
#define RW_CLR_ERR	  0x24
#define RW_MGM_CTRL	  0x28
#define R_STAT		  0x2c
#define FS_ETH_MAX_REGS	  0x5c

struct fs_eth
{
	CPUState *env;
	qemu_irq *irq;
	VLANClientState *vc;
	int ethregs;

	/* Two addrs in the filter.  */
	uint8_t macaddr[2][6];
	uint32_t regs[FS_ETH_MAX_REGS];

	struct etraxfs_dma_client *dma_out;
	struct etraxfs_dma_client *dma_in;

	/* MDIO bus.  */
	struct qemu_mdio mdio_bus;
	unsigned int phyaddr;
	int duplex_mismatch;

	/* PHY.	 */
	struct qemu_phy phy;
};

static void eth_validate_duplex(struct fs_eth *eth)
{
	struct qemu_phy *phy;
	unsigned int phy_duplex;
	unsigned int mac_duplex;
	int new_mm = 0;

	phy = eth->mdio_bus.devs[eth->phyaddr];
	phy_duplex = !!(phy->read(phy, 18) & (1 << 11));
	mac_duplex = !!(eth->regs[RW_REC_CTRL] & 128);

	if (mac_duplex != phy_duplex)
		new_mm = 1;

	if (eth->regs[RW_GEN_CTRL] & 1) {
		if (new_mm != eth->duplex_mismatch) {
			if (new_mm)
				printf("HW: WARNING "
				       "ETH duplex mismatch MAC=%d PHY=%d\n",
				       mac_duplex, phy_duplex);
			else
				printf("HW: ETH duplex ok.\n");
		}
		eth->duplex_mismatch = new_mm;
	}
}

static uint32_t eth_rinvalid (void *opaque, target_phys_addr_t addr)
{
	struct fs_eth *eth = opaque;
	CPUState *env = eth->env;
	cpu_abort(env, "Unsupported short access. reg=" TARGET_FMT_plx "\n",
		  addr);
	return 0;
}

static uint32_t eth_readl (void *opaque, target_phys_addr_t addr)
{
	struct fs_eth *eth = opaque;
	uint32_t r = 0;

	switch (addr) {
		case R_STAT:
			/* Attach an MDIO/PHY abstraction.  */
			r = eth->mdio_bus.mdio & 1;
			break;
	default:
		r = eth->regs[addr];
		D(printf ("%s %x\n", __func__, addr));
		break;
	}
	return r;
}

static void
eth_winvalid (void *opaque, target_phys_addr_t addr, uint32_t value)
{
	struct fs_eth *eth = opaque;
	CPUState *env = eth->env;
	cpu_abort(env, "Unsupported short access. reg=" TARGET_FMT_plx "\n",
		  addr);
}

static void eth_update_ma(struct fs_eth *eth, int ma)
{
	int reg;
	int i = 0;

	ma &= 1;

	reg = RW_MA0_LO;
	if (ma)
		reg = RW_MA1_LO;

	eth->macaddr[ma][i++] = eth->regs[reg];
	eth->macaddr[ma][i++] = eth->regs[reg] >> 8;
	eth->macaddr[ma][i++] = eth->regs[reg] >> 16;
	eth->macaddr[ma][i++] = eth->regs[reg] >> 24;
	eth->macaddr[ma][i++] = eth->regs[reg + 4];
	eth->macaddr[ma][i++] = eth->regs[reg + 4] >> 8;

	D(printf("set mac%d=%x.%x.%x.%x.%x.%x\n", ma,
		 eth->macaddr[ma][0], eth->macaddr[ma][1],
		 eth->macaddr[ma][2], eth->macaddr[ma][3],
		 eth->macaddr[ma][4], eth->macaddr[ma][5]));
}

static void
eth_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
{
	struct fs_eth *eth = opaque;

	switch (addr)
	{
		case RW_MA0_LO:
			eth->regs[addr] = value;
			eth_update_ma(eth, 0);
			break;
		case RW_MA0_HI:
			eth->regs[addr] = value;
			eth_update_ma(eth, 0);
			break;
		case RW_MA1_LO:
			eth->regs[addr] = value;
			eth_update_ma(eth, 1);
			break;
		case RW_MA1_HI:
			eth->regs[addr] = value;
			eth_update_ma(eth, 1);
			break;

		case RW_MGM_CTRL:
			/* Attach an MDIO/PHY abstraction.  */
			if (value & 2)
				eth->mdio_bus.mdio = value & 1;
			if (eth->mdio_bus.mdc != (value & 4)) {
				mdio_cycle(&eth->mdio_bus);
				eth_validate_duplex(eth);
			}
			eth->mdio_bus.mdc = !!(value & 4);
			break;

		case RW_REC_CTRL:
			eth->regs[addr] = value;
			eth_validate_duplex(eth);
			break;

		default:
			eth->regs[addr] = value;
			D(printf ("%s %x %x\n",
				  __func__, addr, value));
			break;
	}
}

/* The ETRAX FS has a groupt address table (GAT) which works like a k=1 bloom
   filter dropping group addresses we have not joined.	The filter has 64
   bits (m). The has function is a simple nible xor of the group addr.	*/
static int eth_match_groupaddr(struct fs_eth *eth, const unsigned char *sa)
{
	unsigned int hsh;
	int m_individual = eth->regs[RW_REC_CTRL] & 4;
	int match;

	/* First bit on the wire of a MAC address signals multicast or
	   physical address.  */
	if (!m_individual && !sa[0] & 1)
		return 0;

	/* Calculate the hash index for the GA registers. */
	hsh = 0;
	hsh ^= (*sa) & 0x3f;
	hsh ^= ((*sa) >> 6) & 0x03;
	++sa;
	hsh ^= ((*sa) << 2) & 0x03c;
	hsh ^= ((*sa) >> 4) & 0xf;
	++sa;
	hsh ^= ((*sa) << 4) & 0x30;
	hsh ^= ((*sa) >> 2) & 0x3f;
	++sa;
	hsh ^= (*sa) & 0x3f;
	hsh ^= ((*sa) >> 6) & 0x03;
	++sa;
	hsh ^= ((*sa) << 2) & 0x03c;
	hsh ^= ((*sa) >> 4) & 0xf;
	++sa;
	hsh ^= ((*sa) << 4) & 0x30;
	hsh ^= ((*sa) >> 2) & 0x3f;

	hsh &= 63;
	if (hsh > 31)
		match = eth->regs[RW_GA_HI] & (1 << (hsh - 32));
	else
		match = eth->regs[RW_GA_LO] & (1 << hsh);
	D(printf("hsh=%x ga=%x.%x mtch=%d\n", hsh,
		 eth->regs[RW_GA_HI], eth->regs[RW_GA_LO], match));
	return match;
}

static int eth_can_receive(void *opaque)
{
	return 1;
}

static void eth_receive(void *opaque, const uint8_t *buf, int size)
{
	unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
	struct fs_eth *eth = opaque;
	int use_ma0 = eth->regs[RW_REC_CTRL] & 1;
	int use_ma1 = eth->regs[RW_REC_CTRL] & 2;
	int r_bcast = eth->regs[RW_REC_CTRL] & 8;

	if (size < 12)
		return;

	D(printf("%x.%x.%x.%x.%x.%x ma=%d %d bc=%d\n",
		 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
		 use_ma0, use_ma1, r_bcast));
	       
	/* Does the frame get through the address filters?  */
	if ((!use_ma0 || memcmp(buf, eth->macaddr[0], 6))
	    && (!use_ma1 || memcmp(buf, eth->macaddr[1], 6))
	    && (!r_bcast || memcmp(buf, sa_bcast, 6))
	    && !eth_match_groupaddr(eth, buf))
		return;

	/* FIXME: Find another way to pass on the fake csum.  */
	etraxfs_dmac_input(eth->dma_in, (void *)buf, size + 4, 1);
}

static int eth_tx_push(void *opaque, unsigned char *buf, int len)
{
	struct fs_eth *eth = opaque;

	D(printf("%s buf=%p len=%d\n", __func__, buf, len));
	qemu_send_packet(eth->vc, buf, len);
	return len;
}

static CPUReadMemoryFunc *eth_read[] = {
	&eth_rinvalid,
	&eth_rinvalid,
	&eth_readl,
};

static CPUWriteMemoryFunc *eth_write[] = {
	&eth_winvalid,
	&eth_winvalid,
	&eth_writel,
};

void *etraxfs_eth_init(NICInfo *nd, CPUState *env, 
		       qemu_irq *irq, target_phys_addr_t base)
{
	struct etraxfs_dma_client *dma = NULL;	
	struct fs_eth *eth = NULL;

	dma = qemu_mallocz(sizeof *dma * 2);
	if (!dma)
		return NULL;

	eth = qemu_mallocz(sizeof *eth);
	if (!eth)
		goto err;

	dma[0].client.push = eth_tx_push;
	dma[0].client.opaque = eth;
	dma[1].client.opaque = eth;
	dma[1].client.pull = NULL;

	eth->env = env;
	eth->irq = irq;
	eth->dma_out = dma;
	eth->dma_in = dma + 1;

	/* Connect the phy.  */
	eth->phyaddr = 1;
	tdk_init(&eth->phy);
	mdio_attach(&eth->mdio_bus, &eth->phy, eth->phyaddr);

	eth->ethregs = cpu_register_io_memory(0, eth_read, eth_write, eth);
	cpu_register_physical_memory (base, 0x5c, eth->ethregs);

	eth->vc = qemu_new_vlan_client(nd->vlan, 
				       eth_receive, eth_can_receive, eth);

	return dma;
  err:
	qemu_free(eth);
	qemu_free(dma);
	return NULL;
}
Commit	Line	Data
a3ea5df5 EI	1	/*
	2	* QEMU ETRAX Ethernet Controller.
	3	*
	4	* Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
	24
	25	#include <stdio.h>
	26	#include "hw.h"
	27	#include "net.h"
	28
	29	#include "etraxfs_dma.h"
	30
	31	#define D(x)
	32
c6488268 EI	33	/* Advertisement control register. */
	34	#define ADVERTISE_10HALF 0x0020 /* Try for 10mbps half-duplex */
	35	#define ADVERTISE_10FULL 0x0040 /* Try for 10mbps full-duplex */
	36	#define ADVERTISE_100HALF 0x0080 /* Try for 100mbps half-duplex */
	37	#define ADVERTISE_100FULL 0x0100 /* Try for 100mbps full-duplex */
	38
2e56350e EI	39	/*
	40	* The MDIO extensions in the TDK PHY model were reversed engineered from the
	41	* linux driver (PHYID and Diagnostics reg).
	42	* TODO: Add friendly names for the register nums.
	43	*/
a3ea5df5 EI	44	struct qemu_phy
	45	{
	46	uint32_t regs[32];
	47
	48	unsigned int (read)(struct qemu_phy phy, unsigned int req);
2e56350e EI	49	void (write)(struct qemu_phy phy, unsigned int req,
2e56350e EI	50	unsigned int data);
a3ea5df5 EI	51	};
	52
	53	static unsigned int tdk_read(struct qemu_phy *phy, unsigned int req)
	54	{
	55	int regnum;
	56	unsigned r = 0;
	57
	58	regnum = req & 0x1f;
	59
	60	switch (regnum) {
	61	case 1:
f6953f13	62	/* MR1. */
a3ea5df5 EI	63	/* Speeds and modes. */
	64	r \|= (1 << 13) \| (1 << 14);
	65	r \|= (1 << 11) \| (1 << 12);
	66	r \|= (1 << 5); /* Autoneg complete. */
f6953f13 EI	67	r \|= (1 << 3); /* Autoneg able. */
f6953f13 EI	68	r \|= (1 << 2); /* Link. */
a3ea5df5	69	break;
2e56350e EI	70	case 5:
	71	/* Link partner ability.
	72	We are kind; always agree with whatever best mode
	73	the guest advertises. */
	74	r = 1 << 14; /* Success. */
	75	/* Copy advertised modes. */
	76	r \|= phy->regs[4] & (15 << 5);
	77	/* Autoneg support. */
	78	r \|= 1;
	79	break;
	80	case 18:
	81	{
	82	/* Diagnostics reg. */
	83	int duplex = 0;
	84	int speed_100 = 0;
	85
	86	/* Are we advertising 100 half or 100 duplex ? */
c6488268 EI	87	speed_100 = !!(phy->regs[4] & ADVERTISE_100HALF);
	88	speed_100 \|= !!(phy->regs[4] & ADVERTISE_100FULL);
	89
2e56350e	90	/* Are we advertising 10 duplex or 100 duplex ? */
c6488268 EI	91	duplex = !!(phy->regs[4] & ADVERTISE_100FULL);
c6488268 EI	92	duplex \|= !!(phy->regs[4] & ADVERTISE_10FULL);
2e56350e EI	93	r = (speed_100 << 10) \| (duplex << 11);
	94	}
	95	break;
	96
a3ea5df5 EI	97	default:
	98	r = phy->regs[regnum];
	99	break;
	100	}
2e56350e	101	D(printf("\n%s %x = reg[%d]\n", __func__, r, regnum));
a3ea5df5 EI	102	return r;
	103	}
	104
	105	static void
	106	tdk_write(struct qemu_phy *phy, unsigned int req, unsigned int data)
	107	{
	108	int regnum;
	109
	110	regnum = req & 0x1f;
	111	D(printf("%s reg[%d] = %x\n", __func__, regnum, data));
	112	switch (regnum) {
	113	default:
	114	phy->regs[regnum] = data;
	115	break;
	116	}
	117	}
	118
	119	static void
	120	tdk_init(struct qemu_phy *phy)
	121	{
2e56350e EI	122	phy->regs[0] = 0x3100;
	123	/* PHY Id. */
	124	phy->regs[2] = 0x0300;
	125	phy->regs[3] = 0xe400;
	126	/* Autonegotiation advertisement reg. */
	127	phy->regs[4] = 0x01E1;
	128
a3ea5df5 EI	129	phy->read = tdk_read;
	130	phy->write = tdk_write;
	131	}
	132
	133	struct qemu_mdio
	134	{
f6953f13	135	/* bus. */
a3ea5df5 EI	136	int mdc;
	137	int mdio;
	138
	139	/* decoder. */
	140	enum {
	141	PREAMBLE,
	142	SOF,
	143	OPC,
	144	ADDR,
	145	REQ,
	146	TURNAROUND,
	147	DATA
	148	} state;
	149	unsigned int drive;
	150
	151	unsigned int cnt;
	152	unsigned int addr;
	153	unsigned int opc;
	154	unsigned int req;
	155	unsigned int data;
	156
	157	struct qemu_phy *devs[32];
	158	};
	159
	160	static void
	161	mdio_attach(struct qemu_mdio bus, struct qemu_phy phy, unsigned int addr)
	162	{
	163	bus->devs[addr & 0x1f] = phy;
	164	}
	165
d297f464	166	#ifdef USE_THIS_DEAD_CODE
a3ea5df5 EI	167	static void
	168	mdio_detach(struct qemu_mdio bus, struct qemu_phy phy, unsigned int addr)
	169	{
	170	bus->devs[addr & 0x1f] = NULL;
	171	}
d297f464	172	#endif
a3ea5df5 EI	173
	174	static void mdio_read_req(struct qemu_mdio *bus)
	175	{
	176	struct qemu_phy *phy;
	177
	178	phy = bus->devs[bus->addr];
	179	if (phy && phy->read)
	180	bus->data = phy->read(phy, bus->req);
	181	else
	182	bus->data = 0xffff;
	183	}
	184
	185	static void mdio_write_req(struct qemu_mdio *bus)
	186	{
	187	struct qemu_phy *phy;
	188
	189	phy = bus->devs[bus->addr];
	190	if (phy && phy->write)
	191	phy->write(phy, bus->req, bus->data);
	192	}
	193
	194	static void mdio_cycle(struct qemu_mdio *bus)
	195	{
	196	bus->cnt++;
	197
	198	D(printf("mdc=%d mdio=%d state=%d cnt=%d drv=%d\n",
	199	bus->mdc, bus->mdio, bus->state, bus->cnt, bus->drive));
	200	#if 0
	201	if (bus->mdc)
	202	printf("%d", bus->mdio);
	203	#endif
	204	switch (bus->state)
	205	{
	206	case PREAMBLE:
	207	if (bus->mdc) {
	208	if (bus->cnt >= (32 * 2) && !bus->mdio) {
	209	bus->cnt = 0;
	210	bus->state = SOF;
	211	bus->data = 0;
	212	}
	213	}
	214	break;
	215	case SOF:
	216	if (bus->mdc) {
	217	if (bus->mdio != 1)
	218	printf("WARNING: no SOF\n");
	219	if (bus->cnt == 1*2) {
	220	bus->cnt = 0;
	221	bus->opc = 0;
	222	bus->state = OPC;
	223	}
	224	}
	225	break;
	226	case OPC:
	227	if (bus->mdc) {
	228	bus->opc <<= 1;
	229	bus->opc \|= bus->mdio & 1;
	230	if (bus->cnt == 2*2) {
	231	bus->cnt = 0;
	232	bus->addr = 0;
	233	bus->state = ADDR;
	234	}
	235	}
	236	break;
237	case ADDR:
238	if (bus->mdc) {
239	bus->addr <<= 1;
240	bus->addr \|= bus->mdio & 1;
241
242	if (bus->cnt == 5*2) {
243	bus->cnt = 0;
244	bus->req = 0;
245	bus->state = REQ;
246	}
247	}
248	break;
249	case REQ:
250	if (bus->mdc) {
251	bus->req <<= 1;
252	bus->req \|= bus->mdio & 1;
253	if (bus->cnt == 5*2) {
254	bus->cnt = 0;
255	bus->state = TURNAROUND;
256	}
257	}
258	break;
259	case TURNAROUND:
260	if (bus->mdc && bus->cnt == 2*2) {
261	bus->mdio = 0;
262	bus->cnt = 0;
263
264	if (bus->opc == 2) {
265	bus->drive = 1;
266	mdio_read_req(bus);
267	bus->mdio = bus->data & 1;
268	}
269	bus->state = DATA;
270	}
271	break;
272	case DATA:
273	if (!bus->mdc) {
274	if (bus->drive) {
2e56350e EI	275	bus->mdio = !!(bus->data & (1 << 15));
2e56350e EI	276	bus->data <<= 1;
a3ea5df5 EI	277	}
	278	} else {
	279	if (!bus->drive) {
	280	bus->data <<= 1;
	281	bus->data \|= bus->mdio;
	282	}
	283	if (bus->cnt == 16 * 2) {
	284	bus->cnt = 0;
	285	bus->state = PREAMBLE;
2e56350e EI	286	if (!bus->drive)
	287	mdio_write_req(bus);
	288	bus->drive = 0;
a3ea5df5 EI	289	}
	290	}
	291	break;
	292	default:
	293	break;
	294	}
	295	}
	296
2e56350e EI	297	/* ETRAX-FS Ethernet MAC block starts here. */
2e56350e EI	298
f6953f13 EI	299	#define RW_MA0_LO 0x00
	300	#define RW_MA0_HI 0x04
	301	#define RW_MA1_LO 0x08
	302	#define RW_MA1_HI 0x0c
	303	#define RW_GA_LO 0x10
	304	#define RW_GA_HI 0x14
	305	#define RW_GEN_CTRL 0x18
	306	#define RW_REC_CTRL 0x1c
	307	#define RW_TR_CTRL 0x20
	308	#define RW_CLR_ERR 0x24
	309	#define RW_MGM_CTRL 0x28
	310	#define R_STAT 0x2c
	311	#define FS_ETH_MAX_REGS 0x5c
a3ea5df5 EI	312
	313	struct fs_eth
	314	{
f6953f13	315	CPUState *env;
a3ea5df5	316	qemu_irq *irq;
a3ea5df5	317	VLANClientState *vc;
a3ea5df5 EI	318	int ethregs;
a3ea5df5 EI	319
f6953f13 EI	320	/* Two addrs in the filter. */
f6953f13 EI	321	uint8_t macaddr[2][6];
a3ea5df5 EI	322	uint32_t regs[FS_ETH_MAX_REGS];
a3ea5df5 EI	323
a3ea5df5 EI	324	struct etraxfs_dma_client *dma_out;
	325	struct etraxfs_dma_client *dma_in;
	326
	327	/* MDIO bus. */
	328	struct qemu_mdio mdio_bus;
c6488268 EI	329	unsigned int phyaddr;
	330	int duplex_mismatch;
	331
f6953f13	332	/* PHY. */
a3ea5df5 EI	333	struct qemu_phy phy;
	334	};
	335
c6488268 EI	336	static void eth_validate_duplex(struct fs_eth *eth)
	337	{
	338	struct qemu_phy *phy;
	339	unsigned int phy_duplex;
	340	unsigned int mac_duplex;
	341	int new_mm = 0;
	342
	343	phy = eth->mdio_bus.devs[eth->phyaddr];
	344	phy_duplex = !!(phy->read(phy, 18) & (1 << 11));
	345	mac_duplex = !!(eth->regs[RW_REC_CTRL] & 128);
	346
	347	if (mac_duplex != phy_duplex)
	348	new_mm = 1;
	349
	350	if (eth->regs[RW_GEN_CTRL] & 1) {
	351	if (new_mm != eth->duplex_mismatch) {
	352	if (new_mm)
	353	printf("HW: WARNING "
	354	"ETH duplex mismatch MAC=%d PHY=%d\n",
	355	mac_duplex, phy_duplex);
	356	else
	357	printf("HW: ETH duplex ok.\n");
	358	}
	359	eth->duplex_mismatch = new_mm;
	360	}
	361	}
	362
a3ea5df5 EI	363	static uint32_t eth_rinvalid (void *opaque, target_phys_addr_t addr)
a3ea5df5 EI	364	{
f6953f13 EI	365	struct fs_eth *eth = opaque;
f6953f13 EI	366	CPUState *env = eth->env;
d27b2e50 EI	367	cpu_abort(env, "Unsupported short access. reg=" TARGET_FMT_plx "\n",
d27b2e50 EI	368	addr);
f6953f13	369	return 0;
a3ea5df5 EI	370	}
	371
	372	static uint32_t eth_readl (void *opaque, target_phys_addr_t addr)
	373	{
f6953f13	374	struct fs_eth *eth = opaque;
f6953f13	375	uint32_t r = 0;
a3ea5df5	376
f6953f13	377	switch (addr) {
a3ea5df5 EI	378	case R_STAT:
	379	/* Attach an MDIO/PHY abstraction. */
	380	r = eth->mdio_bus.mdio & 1;
	381	break;
f6953f13	382	default:
a3ea5df5	383	r = eth->regs[addr];
d27b2e50	384	D(printf ("%s %x\n", __func__, addr));
f6953f13 EI	385	break;
	386	}
	387	return r;
a3ea5df5 EI	388	}
	389
	390	static void
	391	eth_winvalid (void *opaque, target_phys_addr_t addr, uint32_t value)
	392	{
f6953f13 EI	393	struct fs_eth *eth = opaque;
f6953f13 EI	394	CPUState *env = eth->env;
d27b2e50 EI	395	cpu_abort(env, "Unsupported short access. reg=" TARGET_FMT_plx "\n",
d27b2e50 EI	396	addr);
f6953f13 EI	397	}
	398
	399	static void eth_update_ma(struct fs_eth *eth, int ma)
	400	{
	401	int reg;
	402	int i = 0;
	403
	404	ma &= 1;
	405
	406	reg = RW_MA0_LO;
	407	if (ma)
	408	reg = RW_MA1_LO;
	409
	410	eth->macaddr[ma][i++] = eth->regs[reg];
	411	eth->macaddr[ma][i++] = eth->regs[reg] >> 8;
	412	eth->macaddr[ma][i++] = eth->regs[reg] >> 16;
	413	eth->macaddr[ma][i++] = eth->regs[reg] >> 24;
	414	eth->macaddr[ma][i++] = eth->regs[reg + 4];
	415	eth->macaddr[ma][i++] = eth->regs[reg + 4] >> 8;
	416
	417	D(printf("set mac%d=%x.%x.%x.%x.%x.%x\n", ma,
	418	eth->macaddr[ma][0], eth->macaddr[ma][1],
	419	eth->macaddr[ma][2], eth->macaddr[ma][3],
	420	eth->macaddr[ma][4], eth->macaddr[ma][5]));
a3ea5df5 EI	421	}
	422
	423	static void
	424	eth_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
	425	{
f6953f13	426	struct fs_eth *eth = opaque;
f6953f13	427
f6953f13 EI	428	switch (addr)
	429	{
	430	case RW_MA0_LO:
	431	eth->regs[addr] = value;
	432	eth_update_ma(eth, 0);
	433	break;
	434	case RW_MA0_HI:
	435	eth->regs[addr] = value;
	436	eth_update_ma(eth, 0);
	437	break;
	438	case RW_MA1_LO:
	439	eth->regs[addr] = value;
	440	eth_update_ma(eth, 1);
	441	break;
	442	case RW_MA1_HI:
	443	eth->regs[addr] = value;
	444	eth_update_ma(eth, 1);
	445	break;
a3ea5df5	446
a3ea5df5 EI	447	case RW_MGM_CTRL:
	448	/* Attach an MDIO/PHY abstraction. */
	449	if (value & 2)
	450	eth->mdio_bus.mdio = value & 1;
c6488268	451	if (eth->mdio_bus.mdc != (value & 4)) {
a3ea5df5	452	mdio_cycle(&eth->mdio_bus);
c6488268 EI	453	eth_validate_duplex(eth);
c6488268 EI	454	}
a3ea5df5 EI	455	eth->mdio_bus.mdc = !!(value & 4);
	456	break;
	457
c6488268 EI	458	case RW_REC_CTRL:
	459	eth->regs[addr] = value;
	460	eth_validate_duplex(eth);
	461	break;
	462
f6953f13 EI	463	default:
f6953f13 EI	464	eth->regs[addr] = value;
9bcd77d6 EI	465	D(printf ("%s %x %x\n",
9bcd77d6 EI	466	__func__, addr, value));
f6953f13 EI	467	break;
	468	}
	469	}
	470
	471	/* The ETRAX FS has a groupt address table (GAT) which works like a k=1 bloom
	472	filter dropping group addresses we have not joined. The filter has 64
	473	bits (m). The has function is a simple nible xor of the group addr. */
	474	static int eth_match_groupaddr(struct fs_eth eth, const unsigned char sa)
	475	{
	476	unsigned int hsh;
	477	int m_individual = eth->regs[RW_REC_CTRL] & 4;
	478	int match;
	479
	480	/* First bit on the wire of a MAC address signals multicast or
	481	physical address. */
	482	if (!m_individual && !sa[0] & 1)
	483	return 0;
	484
	485	/* Calculate the hash index for the GA registers. */
	486	hsh = 0;
	487	hsh ^= (*sa) & 0x3f;
	488	hsh ^= ((*sa) >> 6) & 0x03;
	489	++sa;
	490	hsh ^= ((*sa) << 2) & 0x03c;
	491	hsh ^= ((*sa) >> 4) & 0xf;
	492	++sa;
	493	hsh ^= ((*sa) << 4) & 0x30;
	494	hsh ^= ((*sa) >> 2) & 0x3f;
	495	++sa;
	496	hsh ^= (*sa) & 0x3f;
	497	hsh ^= ((*sa) >> 6) & 0x03;
	498	++sa;
	499	hsh ^= ((*sa) << 2) & 0x03c;
	500	hsh ^= ((*sa) >> 4) & 0xf;
	501	++sa;
	502	hsh ^= ((*sa) << 4) & 0x30;
	503	hsh ^= ((*sa) >> 2) & 0x3f;
	504
	505	hsh &= 63;
	506	if (hsh > 31)
	507	match = eth->regs[RW_GA_HI] & (1 << (hsh - 32));
	508	else
	509	match = eth->regs[RW_GA_LO] & (1 << hsh);
	510	D(printf("hsh=%x ga=%x.%x mtch=%d\n", hsh,
	511	eth->regs[RW_GA_HI], eth->regs[RW_GA_LO], match));
	512	return match;
a3ea5df5 EI	513	}
	514
	515	static int eth_can_receive(void *opaque)
	516	{
aa25cf46	517	return 1;
a3ea5df5 EI	518	}
	519
	520	static void eth_receive(void opaque, const uint8_t buf, int size)
	521	{
f6953f13	522	unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
a3ea5df5	523	struct fs_eth *eth = opaque;
f6953f13 EI	524	int use_ma0 = eth->regs[RW_REC_CTRL] & 1;
	525	int use_ma1 = eth->regs[RW_REC_CTRL] & 2;
	526	int r_bcast = eth->regs[RW_REC_CTRL] & 8;
	527
	528	if (size < 12)
	529	return;
	530
	531	D(printf("%x.%x.%x.%x.%x.%x ma=%d %d bc=%d\n",
	532	buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
	533	use_ma0, use_ma1, r_bcast));
	534
	535	/* Does the frame get through the address filters? */
	536	if ((!use_ma0 \|\| memcmp(buf, eth->macaddr[0], 6))
	537	&& (!use_ma1 \|\| memcmp(buf, eth->macaddr[1], 6))
	538	&& (!r_bcast \|\| memcmp(buf, sa_bcast, 6))
	539	&& !eth_match_groupaddr(eth, buf))
	540	return;
	541
aa25cf46 EI	542	/* FIXME: Find another way to pass on the fake csum. */
aa25cf46 EI	543	etraxfs_dmac_input(eth->dma_in, (void *)buf, size + 4, 1);
a3ea5df5 EI	544	}
	545
	546	static int eth_tx_push(void opaque, unsigned char buf, int len)
	547	{
	548	struct fs_eth *eth = opaque;
	549
	550	D(printf("%s buf=%p len=%d\n", __func__, buf, len));
	551	qemu_send_packet(eth->vc, buf, len);
	552	return len;
	553	}
	554
	555	static CPUReadMemoryFunc *eth_read[] = {
2e56350e EI	556	&eth_rinvalid,
	557	&eth_rinvalid,
	558	&eth_readl,
a3ea5df5 EI	559	};
	560
	561	static CPUWriteMemoryFunc *eth_write[] = {
2e56350e EI	562	&eth_winvalid,
	563	&eth_winvalid,
	564	&eth_writel,
a3ea5df5 EI	565	};
	566
	567	void etraxfs_eth_init(NICInfo nd, CPUState *env,
	568	qemu_irq *irq, target_phys_addr_t base)
	569	{
	570	struct etraxfs_dma_client *dma = NULL;
	571	struct fs_eth *eth = NULL;
	572
	573	dma = qemu_mallocz(sizeof dma 2);
	574	if (!dma)
	575	return NULL;
	576
	577	eth = qemu_mallocz(sizeof *eth);
	578	if (!eth)
	579	goto err;
	580
	581	dma[0].client.push = eth_tx_push;
	582	dma[0].client.opaque = eth;
	583	dma[1].client.opaque = eth;
aa25cf46	584	dma[1].client.pull = NULL;
a3ea5df5 EI	585
a3ea5df5 EI	586	eth->env = env;
a3ea5df5 EI	587	eth->irq = irq;
	588	eth->dma_out = dma;
	589	eth->dma_in = dma + 1;
a3ea5df5 EI	590
a3ea5df5 EI	591	/* Connect the phy. */
c6488268	592	eth->phyaddr = 1;
a3ea5df5	593	tdk_init(&eth->phy);
c6488268	594	mdio_attach(&eth->mdio_bus, &eth->phy, eth->phyaddr);
a3ea5df5 EI	595
	596	eth->ethregs = cpu_register_io_memory(0, eth_read, eth_write, eth);
	597	cpu_register_physical_memory (base, 0x5c, eth->ethregs);
	598
	599	eth->vc = qemu_new_vlan_client(nd->vlan,
	600	eth_receive, eth_can_receive, eth);
	601
	602	return dma;
	603	err:
	604	qemu_free(eth);
	605	qemu_free(dma);
	606	return NULL;
	607	}