[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 "sysbus.h"
#include "net.h"
#include "etraxfs.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];

	int link;

	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:
			if (!phy->link)
				break;
			/* 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;

			if (!phy->link)
				break;

			/* 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->link = 1;

	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	  0x01
#define RW_MA1_LO	  0x02
#define RW_MA1_HI	  0x03
#define RW_GA_LO	  0x04
#define RW_GA_HI	  0x05
#define RW_GEN_CTRL	  0x06
#define RW_REC_CTRL	  0x07
#define RW_TR_CTRL	  0x08
#define RW_CLR_ERR	  0x09
#define RW_MGM_CTRL	  0x0a
#define R_STAT		  0x0b
#define FS_ETH_MAX_REGS	  0x17

struct fs_eth
{
	SysBusDevice busdev;
	MemoryRegion mmio;
	NICState *nic;
	NICConf conf;

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

	union {
		void *vdma_out;
		struct etraxfs_dma_client *dma_out;
	};
	union {
		void *vdma_in;
		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 uint64_t
eth_read(void *opaque, target_phys_addr_t addr, unsigned int size)
{
	struct fs_eth *eth = opaque;
	uint32_t r = 0;

	addr >>= 2;

	switch (addr) {
		case R_STAT:
			r = eth->mdio_bus.mdio & 1;
			break;
	default:
		r = eth->regs[addr];
		D(printf ("%s %x\n", __func__, addr * 4));
		break;
	}
	return r;
}

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 + 1];
	eth->macaddr[ma][i] = eth->regs[reg + 1] >> 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_write(void *opaque, target_phys_addr_t addr,
          uint64_t val64, unsigned int size)
{
	struct fs_eth *eth = opaque;
	uint32_t value = val64;

	addr >>= 2;
	switch (addr)
	{
		case RW_MA0_LO:
		case RW_MA0_HI:
			eth->regs[addr] = value;
			eth_update_ma(eth, 0);
			break;
		case RW_MA1_LO:
		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);
			eth->regs[addr] = value;
			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(VLANClientState *nc)
{
	return 1;
}

static ssize_t eth_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
{
	unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
	struct fs_eth *eth = DO_UPCAST(NICState, nc, nc)->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 -1;

	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 size;

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

        return size;
}

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->nic->nc, buf, len);
	return len;
}

static void eth_set_link(VLANClientState *nc)
{
	struct fs_eth *eth = DO_UPCAST(NICState, nc, nc)->opaque;
	D(printf("%s %d\n", __func__, nc->link_down));
	eth->phy.link = !nc->link_down;
}

static const MemoryRegionOps eth_ops = {
	.read = eth_read,
	.write = eth_write,
	.endianness = DEVICE_LITTLE_ENDIAN,
	.valid = {
		.min_access_size = 4,
		.max_access_size = 4
	}
};

static void eth_cleanup(VLANClientState *nc)
{
	struct fs_eth *eth = DO_UPCAST(NICState, nc, nc)->opaque;

	/* Disconnect the client.  */
	eth->dma_out->client.push = NULL;
	eth->dma_out->client.opaque = NULL;
	eth->dma_in->client.opaque = NULL;
	eth->dma_in->client.pull = NULL;
        g_free(eth);
}

static NetClientInfo net_etraxfs_info = {
	.type = NET_CLIENT_TYPE_NIC,
	.size = sizeof(NICState),
	.can_receive = eth_can_receive,
	.receive = eth_receive,
	.cleanup = eth_cleanup,
	.link_status_changed = eth_set_link,
};

static int fs_eth_init(SysBusDevice *dev)
{
	struct fs_eth *s = FROM_SYSBUS(typeof(*s), dev);

	if (!s->dma_out || !s->dma_in) {
		hw_error("Unconnected ETRAX-FS Ethernet MAC.\n");
	}

	s->dma_out->client.push = eth_tx_push;
	s->dma_out->client.opaque = s;
	s->dma_in->client.opaque = s;
	s->dma_in->client.pull = NULL;

	memory_region_init_io(&s->mmio, &eth_ops, s, "etraxfs-eth", 0x5c);
	sysbus_init_mmio(dev, &s->mmio);

	qemu_macaddr_default_if_unset(&s->conf.macaddr);
	s->nic = qemu_new_nic(&net_etraxfs_info, &s->conf,
			      dev->qdev.info->name, dev->qdev.id, s);
	qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a);

	tdk_init(&s->phy);
	mdio_attach(&s->mdio_bus, &s->phy, s->phyaddr);
	return 0;
}

static SysBusDeviceInfo etraxfs_eth_info = {
	.init = fs_eth_init,
	.qdev.name  = "etraxfs-eth",
	.qdev.size  = sizeof(struct fs_eth),
	.qdev.props = (Property[]) {
		DEFINE_PROP_UINT32("phyaddr", struct fs_eth, phyaddr, 1),
		DEFINE_PROP_PTR("dma_out", struct fs_eth, vdma_out),
		DEFINE_PROP_PTR("dma_in", struct fs_eth, vdma_in),
		DEFINE_NIC_PROPERTIES(struct fs_eth, conf),
		DEFINE_PROP_END_OF_LIST(),
	}
};

static void etraxfs_eth_register(void)
{
	sysbus_register_withprop(&etraxfs_eth_info);
}

device_init(etraxfs_eth_register)
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>
d949396e	26	#include "sysbus.h"
a3ea5df5	27	#include "net.h"
cc53adbc	28	#include "etraxfs.h"
a3ea5df5 EI	29
	30	#define D(x)
	31
c6488268 EI	32	/* Advertisement control register. */
	33	#define ADVERTISE_10HALF 0x0020 /* Try for 10mbps half-duplex */
	34	#define ADVERTISE_10FULL 0x0040 /* Try for 10mbps full-duplex */
	35	#define ADVERTISE_100HALF 0x0080 /* Try for 100mbps half-duplex */
	36	#define ADVERTISE_100FULL 0x0100 /* Try for 100mbps full-duplex */
	37
2e56350e EI	38	/*
	39	* The MDIO extensions in the TDK PHY model were reversed engineered from the
	40	* linux driver (PHYID and Diagnostics reg).
	41	* TODO: Add friendly names for the register nums.
	42	*/
a3ea5df5 EI	43	struct qemu_phy
	44	{
	45	uint32_t regs[32];
	46
94410b78 EI	47	int link;
94410b78 EI	48
a3ea5df5	49	unsigned int (read)(struct qemu_phy phy, unsigned int req);
2e56350e EI	50	void (write)(struct qemu_phy phy, unsigned int req,
2e56350e EI	51	unsigned int data);
a3ea5df5 EI	52	};
	53
	54	static unsigned int tdk_read(struct qemu_phy *phy, unsigned int req)
	55	{
	56	int regnum;
	57	unsigned r = 0;
	58
	59	regnum = req & 0x1f;
	60
	61	switch (regnum) {
	62	case 1:
94410b78 EI	63	if (!phy->link)
94410b78 EI	64	break;
f6953f13	65	/* MR1. */
a3ea5df5 EI	66	/* Speeds and modes. */
	67	r \|= (1 << 13) \| (1 << 14);
	68	r \|= (1 << 11) \| (1 << 12);
	69	r \|= (1 << 5); /* Autoneg complete. */
f6953f13	70	r \|= (1 << 3); /* Autoneg able. */
94410b78	71	r \|= (1 << 2); /* link. */
a3ea5df5	72	break;
2e56350e EI	73	case 5:
	74	/* Link partner ability.
	75	We are kind; always agree with whatever best mode
	76	the guest advertises. */
	77	r = 1 << 14; /* Success. */
	78	/* Copy advertised modes. */
	79	r \|= phy->regs[4] & (15 << 5);
	80	/* Autoneg support. */
	81	r \|= 1;
	82	break;
	83	case 18:
	84	{
	85	/* Diagnostics reg. */
	86	int duplex = 0;
	87	int speed_100 = 0;
	88
94410b78 EI	89	if (!phy->link)
	90	break;
	91
2e56350e	92	/* Are we advertising 100 half or 100 duplex ? */
c6488268 EI	93	speed_100 = !!(phy->regs[4] & ADVERTISE_100HALF);
	94	speed_100 \|= !!(phy->regs[4] & ADVERTISE_100FULL);
	95
2e56350e	96	/* Are we advertising 10 duplex or 100 duplex ? */
c6488268 EI	97	duplex = !!(phy->regs[4] & ADVERTISE_100FULL);
c6488268 EI	98	duplex \|= !!(phy->regs[4] & ADVERTISE_10FULL);
2e56350e EI	99	r = (speed_100 << 10) \| (duplex << 11);
	100	}
	101	break;
	102
a3ea5df5 EI	103	default:
	104	r = phy->regs[regnum];
	105	break;
	106	}
2e56350e	107	D(printf("\n%s %x = reg[%d]\n", __func__, r, regnum));
a3ea5df5 EI	108	return r;
	109	}
	110
	111	static void
	112	tdk_write(struct qemu_phy *phy, unsigned int req, unsigned int data)
	113	{
	114	int regnum;
	115
	116	regnum = req & 0x1f;
	117	D(printf("%s reg[%d] = %x\n", __func__, regnum, data));
	118	switch (regnum) {
	119	default:
	120	phy->regs[regnum] = data;
	121	break;
	122	}
	123	}
	124
	125	static void
	126	tdk_init(struct qemu_phy *phy)
	127	{
2e56350e EI	128	phy->regs[0] = 0x3100;
	129	/* PHY Id. */
	130	phy->regs[2] = 0x0300;
	131	phy->regs[3] = 0xe400;
	132	/* Autonegotiation advertisement reg. */
	133	phy->regs[4] = 0x01E1;
94410b78	134	phy->link = 1;
2e56350e	135
a3ea5df5 EI	136	phy->read = tdk_read;
	137	phy->write = tdk_write;
	138	}
	139
	140	struct qemu_mdio
	141	{
f6953f13	142	/* bus. */
a3ea5df5 EI	143	int mdc;
	144	int mdio;
	145
	146	/* decoder. */
	147	enum {
	148	PREAMBLE,
	149	SOF,
	150	OPC,
	151	ADDR,
	152	REQ,
	153	TURNAROUND,
	154	DATA
	155	} state;
	156	unsigned int drive;
	157
	158	unsigned int cnt;
	159	unsigned int addr;
	160	unsigned int opc;
	161	unsigned int req;
	162	unsigned int data;
	163
	164	struct qemu_phy *devs[32];
	165	};
	166
	167	static void
	168	mdio_attach(struct qemu_mdio bus, struct qemu_phy phy, unsigned int addr)
	169	{
	170	bus->devs[addr & 0x1f] = phy;
	171	}
	172
d297f464	173	#ifdef USE_THIS_DEAD_CODE
a3ea5df5 EI	174	static void
	175	mdio_detach(struct qemu_mdio bus, struct qemu_phy phy, unsigned int addr)
	176	{
	177	bus->devs[addr & 0x1f] = NULL;
	178	}
d297f464	179	#endif
a3ea5df5 EI	180
	181	static void mdio_read_req(struct qemu_mdio *bus)
	182	{
	183	struct qemu_phy *phy;
	184
	185	phy = bus->devs[bus->addr];
	186	if (phy && phy->read)
	187	bus->data = phy->read(phy, bus->req);
	188	else
	189	bus->data = 0xffff;
	190	}
	191
	192	static void mdio_write_req(struct qemu_mdio *bus)
	193	{
	194	struct qemu_phy *phy;
	195
	196	phy = bus->devs[bus->addr];
	197	if (phy && phy->write)
	198	phy->write(phy, bus->req, bus->data);
	199	}
	200
	201	static void mdio_cycle(struct qemu_mdio *bus)
	202	{
	203	bus->cnt++;
	204
	205	D(printf("mdc=%d mdio=%d state=%d cnt=%d drv=%d\n",
	206	bus->mdc, bus->mdio, bus->state, bus->cnt, bus->drive));
	207	#if 0
	208	if (bus->mdc)
	209	printf("%d", bus->mdio);
	210	#endif
	211	switch (bus->state)
	212	{
	213	case PREAMBLE:
	214	if (bus->mdc) {
	215	if (bus->cnt >= (32 * 2) && !bus->mdio) {
	216	bus->cnt = 0;
	217	bus->state = SOF;
	218	bus->data = 0;
	219	}
	220	}
	221	break;
	222	case SOF:
	223	if (bus->mdc) {
	224	if (bus->mdio != 1)
	225	printf("WARNING: no SOF\n");
	226	if (bus->cnt == 1*2) {
	227	bus->cnt = 0;
	228	bus->opc = 0;
	229	bus->state = OPC;
	230	}
	231	}
	232	break;
	233	case OPC:
	234	if (bus->mdc) {
	235	bus->opc <<= 1;
	236	bus->opc \|= bus->mdio & 1;
	237	if (bus->cnt == 2*2) {
	238	bus->cnt = 0;
	239	bus->addr = 0;
	240	bus->state = ADDR;
	241	}
	242	}
	243	break;
244	case ADDR:
245	if (bus->mdc) {
246	bus->addr <<= 1;
247	bus->addr \|= bus->mdio & 1;
248
249	if (bus->cnt == 5*2) {
250	bus->cnt = 0;
251	bus->req = 0;
252	bus->state = REQ;
253	}
254	}
255	break;
256	case REQ:
257	if (bus->mdc) {
258	bus->req <<= 1;
259	bus->req \|= bus->mdio & 1;
260	if (bus->cnt == 5*2) {
261	bus->cnt = 0;
262	bus->state = TURNAROUND;
263	}
264	}
265	break;
266	case TURNAROUND:
267	if (bus->mdc && bus->cnt == 2*2) {
268	bus->mdio = 0;
269	bus->cnt = 0;
270
271	if (bus->opc == 2) {
272	bus->drive = 1;
273	mdio_read_req(bus);
274	bus->mdio = bus->data & 1;
275	}
276	bus->state = DATA;
277	}
278	break;
279	case DATA:
280	if (!bus->mdc) {
281	if (bus->drive) {
2e56350e EI	282	bus->mdio = !!(bus->data & (1 << 15));
2e56350e EI	283	bus->data <<= 1;
a3ea5df5 EI	284	}
	285	} else {
	286	if (!bus->drive) {
	287	bus->data <<= 1;
	288	bus->data \|= bus->mdio;
	289	}
	290	if (bus->cnt == 16 * 2) {
	291	bus->cnt = 0;
	292	bus->state = PREAMBLE;
2e56350e EI	293	if (!bus->drive)
	294	mdio_write_req(bus);
	295	bus->drive = 0;
a3ea5df5 EI	296	}
	297	}
	298	break;
	299	default:
	300	break;
	301	}
	302	}
	303
2e56350e EI	304	/* ETRAX-FS Ethernet MAC block starts here. */
2e56350e EI	305
f6953f13	306	#define RW_MA0_LO 0x00
35ef81d6 EI	307	#define RW_MA0_HI 0x01
	308	#define RW_MA1_LO 0x02
	309	#define RW_MA1_HI 0x03
	310	#define RW_GA_LO 0x04
	311	#define RW_GA_HI 0x05
	312	#define RW_GEN_CTRL 0x06
	313	#define RW_REC_CTRL 0x07
	314	#define RW_TR_CTRL 0x08
	315	#define RW_CLR_ERR 0x09
	316	#define RW_MGM_CTRL 0x0a
	317	#define R_STAT 0x0b
	318	#define FS_ETH_MAX_REGS 0x17
a3ea5df5 EI	319
	320	struct fs_eth
	321	{
d949396e	322	SysBusDevice busdev;
06dccb82	323	MemoryRegion mmio;
163bf3a5 MM	324	NICState *nic;
163bf3a5 MM	325	NICConf conf;
a3ea5df5	326
f6953f13 EI	327	/* Two addrs in the filter. */
f6953f13 EI	328	uint8_t macaddr[2][6];
a3ea5df5 EI	329	uint32_t regs[FS_ETH_MAX_REGS];
a3ea5df5 EI	330
d949396e EI	331	union {
	332	void *vdma_out;
	333	struct etraxfs_dma_client *dma_out;
	334	};
	335	union {
	336	void *vdma_in;
	337	struct etraxfs_dma_client *dma_in;
	338	};
a3ea5df5 EI	339
	340	/* MDIO bus. */
	341	struct qemu_mdio mdio_bus;
c6488268 EI	342	unsigned int phyaddr;
	343	int duplex_mismatch;
	344
f6953f13	345	/* PHY. */
a3ea5df5 EI	346	struct qemu_phy phy;
	347	};
	348
c6488268 EI	349	static void eth_validate_duplex(struct fs_eth *eth)
	350	{
	351	struct qemu_phy *phy;
	352	unsigned int phy_duplex;
	353	unsigned int mac_duplex;
	354	int new_mm = 0;
	355
	356	phy = eth->mdio_bus.devs[eth->phyaddr];
	357	phy_duplex = !!(phy->read(phy, 18) & (1 << 11));
	358	mac_duplex = !!(eth->regs[RW_REC_CTRL] & 128);
	359
	360	if (mac_duplex != phy_duplex)
	361	new_mm = 1;
	362
	363	if (eth->regs[RW_GEN_CTRL] & 1) {
	364	if (new_mm != eth->duplex_mismatch) {
	365	if (new_mm)
	366	printf("HW: WARNING "
	367	"ETH duplex mismatch MAC=%d PHY=%d\n",
	368	mac_duplex, phy_duplex);
	369	else
	370	printf("HW: ETH duplex ok.\n");
	371	}
	372	eth->duplex_mismatch = new_mm;
	373	}
	374	}
	375
06dccb82 EI	376	static uint64_t
06dccb82 EI	377	eth_read(void *opaque, target_phys_addr_t addr, unsigned int size)
a3ea5df5	378	{
f6953f13	379	struct fs_eth *eth = opaque;
f6953f13	380	uint32_t r = 0;
a3ea5df5	381
35ef81d6 EI	382	addr >>= 2;
35ef81d6 EI	383
f6953f13	384	switch (addr) {
a3ea5df5	385	case R_STAT:
a3ea5df5 EI	386	r = eth->mdio_bus.mdio & 1;
a3ea5df5 EI	387	break;
f6953f13	388	default:
a3ea5df5	389	r = eth->regs[addr];
35ef81d6	390	D(printf ("%s %x\n", __func__, addr * 4));
f6953f13 EI	391	break;
	392	}
	393	return r;
a3ea5df5 EI	394	}
a3ea5df5 EI	395
f6953f13 EI	396	static void eth_update_ma(struct fs_eth *eth, int ma)
	397	{
	398	int reg;
	399	int i = 0;
	400
	401	ma &= 1;
	402
	403	reg = RW_MA0_LO;
	404	if (ma)
	405	reg = RW_MA1_LO;
	406
	407	eth->macaddr[ma][i++] = eth->regs[reg];
	408	eth->macaddr[ma][i++] = eth->regs[reg] >> 8;
	409	eth->macaddr[ma][i++] = eth->regs[reg] >> 16;
	410	eth->macaddr[ma][i++] = eth->regs[reg] >> 24;
4af6e404	411	eth->macaddr[ma][i++] = eth->regs[reg + 1];
0d84be5b	412	eth->macaddr[ma][i] = eth->regs[reg + 1] >> 8;
f6953f13 EI	413
	414	D(printf("set mac%d=%x.%x.%x.%x.%x.%x\n", ma,
	415	eth->macaddr[ma][0], eth->macaddr[ma][1],
	416	eth->macaddr[ma][2], eth->macaddr[ma][3],
	417	eth->macaddr[ma][4], eth->macaddr[ma][5]));
a3ea5df5 EI	418	}
	419
	420	static void
06dccb82 EI	421	eth_write(void *opaque, target_phys_addr_t addr,
06dccb82 EI	422	uint64_t val64, unsigned int size)
a3ea5df5	423	{
f6953f13	424	struct fs_eth *eth = opaque;
06dccb82	425	uint32_t value = val64;
f6953f13	426
35ef81d6	427	addr >>= 2;
f6953f13 EI	428	switch (addr)
	429	{
	430	case RW_MA0_LO:
f6953f13 EI	431	case RW_MA0_HI:
	432	eth->regs[addr] = value;
	433	eth_update_ma(eth, 0);
	434	break;
	435	case RW_MA1_LO:
f6953f13 EI	436	case RW_MA1_HI:
	437	eth->regs[addr] = value;
	438	eth_update_ma(eth, 1);
	439	break;
a3ea5df5	440
a3ea5df5 EI	441	case RW_MGM_CTRL:
	442	/* Attach an MDIO/PHY abstraction. */
	443	if (value & 2)
	444	eth->mdio_bus.mdio = value & 1;
c6488268	445	if (eth->mdio_bus.mdc != (value & 4)) {
a3ea5df5	446	mdio_cycle(&eth->mdio_bus);
c6488268 EI	447	eth_validate_duplex(eth);
c6488268 EI	448	}
a3ea5df5	449	eth->mdio_bus.mdc = !!(value & 4);
cdcf9153	450	eth->regs[addr] = value;
a3ea5df5 EI	451	break;
a3ea5df5 EI	452
c6488268 EI	453	case RW_REC_CTRL:
	454	eth->regs[addr] = value;
	455	eth_validate_duplex(eth);
	456	break;
	457
f6953f13 EI	458	default:
f6953f13 EI	459	eth->regs[addr] = value;
9bcd77d6 EI	460	D(printf ("%s %x %x\n",
9bcd77d6 EI	461	__func__, addr, value));
f6953f13 EI	462	break;
	463	}
	464	}
	465
	466	/* The ETRAX FS has a groupt address table (GAT) which works like a k=1 bloom
	467	filter dropping group addresses we have not joined. The filter has 64
	468	bits (m). The has function is a simple nible xor of the group addr. */
	469	static int eth_match_groupaddr(struct fs_eth eth, const unsigned char sa)
	470	{
	471	unsigned int hsh;
	472	int m_individual = eth->regs[RW_REC_CTRL] & 4;
	473	int match;
	474
	475	/* First bit on the wire of a MAC address signals multicast or
	476	physical address. */
9e84a470	477	if (!m_individual && !(sa[0] & 1))
f6953f13 EI	478	return 0;
	479
	480	/* Calculate the hash index for the GA registers. */
	481	hsh = 0;
	482	hsh ^= (*sa) & 0x3f;
	483	hsh ^= ((*sa) >> 6) & 0x03;
	484	++sa;
	485	hsh ^= ((*sa) << 2) & 0x03c;
	486	hsh ^= ((*sa) >> 4) & 0xf;
	487	++sa;
	488	hsh ^= ((*sa) << 4) & 0x30;
	489	hsh ^= ((*sa) >> 2) & 0x3f;
	490	++sa;
	491	hsh ^= (*sa) & 0x3f;
	492	hsh ^= ((*sa) >> 6) & 0x03;
	493	++sa;
	494	hsh ^= ((*sa) << 2) & 0x03c;
	495	hsh ^= ((*sa) >> 4) & 0xf;
	496	++sa;
	497	hsh ^= ((*sa) << 4) & 0x30;
	498	hsh ^= ((*sa) >> 2) & 0x3f;
	499
	500	hsh &= 63;
	501	if (hsh > 31)
	502	match = eth->regs[RW_GA_HI] & (1 << (hsh - 32));
	503	else
	504	match = eth->regs[RW_GA_LO] & (1 << hsh);
	505	D(printf("hsh=%x ga=%x.%x mtch=%d\n", hsh,
	506	eth->regs[RW_GA_HI], eth->regs[RW_GA_LO], match));
	507	return match;
a3ea5df5 EI	508	}
a3ea5df5 EI	509
163bf3a5	510	static int eth_can_receive(VLANClientState *nc)
a3ea5df5	511	{
aa25cf46	512	return 1;
a3ea5df5 EI	513	}
a3ea5df5 EI	514
163bf3a5	515	static ssize_t eth_receive(VLANClientState nc, const uint8_t buf, size_t size)
a3ea5df5	516	{
f6953f13	517	unsigned char sa_bcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
163bf3a5	518	struct fs_eth *eth = DO_UPCAST(NICState, nc, nc)->opaque;
f6953f13 EI	519	int use_ma0 = eth->regs[RW_REC_CTRL] & 1;
	520	int use_ma1 = eth->regs[RW_REC_CTRL] & 2;
	521	int r_bcast = eth->regs[RW_REC_CTRL] & 8;
	522
	523	if (size < 12)
4f1c942b	524	return -1;
f6953f13 EI	525
	526	D(printf("%x.%x.%x.%x.%x.%x ma=%d %d bc=%d\n",
	527	buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
	528	use_ma0, use_ma1, r_bcast));
	529
	530	/* Does the frame get through the address filters? */
	531	if ((!use_ma0 \|\| memcmp(buf, eth->macaddr[0], 6))
	532	&& (!use_ma1 \|\| memcmp(buf, eth->macaddr[1], 6))
	533	&& (!r_bcast \|\| memcmp(buf, sa_bcast, 6))
	534	&& !eth_match_groupaddr(eth, buf))
4f1c942b	535	return size;
f6953f13	536
aa25cf46 EI	537	/* FIXME: Find another way to pass on the fake csum. */
aa25cf46 EI	538	etraxfs_dmac_input(eth->dma_in, (void *)buf, size + 4, 1);
4f1c942b MM	539
4f1c942b MM	540	return size;
a3ea5df5 EI	541	}
	542
	543	static int eth_tx_push(void opaque, unsigned char buf, int len)
	544	{
	545	struct fs_eth *eth = opaque;
	546
	547	D(printf("%s buf=%p len=%d\n", __func__, buf, len));
163bf3a5	548	qemu_send_packet(&eth->nic->nc, buf, len);
a3ea5df5 EI	549	return len;
	550	}
	551
163bf3a5	552	static void eth_set_link(VLANClientState *nc)
94410b78	553	{
163bf3a5 MM	554	struct fs_eth *eth = DO_UPCAST(NICState, nc, nc)->opaque;
	555	D(printf("%s %d\n", __func__, nc->link_down));
	556	eth->phy.link = !nc->link_down;
94410b78 EI	557	}
94410b78 EI	558
06dccb82 EI	559	static const MemoryRegionOps eth_ops = {
	560	.read = eth_read,
	561	.write = eth_write,
	562	.endianness = DEVICE_LITTLE_ENDIAN,
	563	.valid = {
	564	.min_access_size = 4,
	565	.max_access_size = 4
	566	}
a3ea5df5 EI	567	};
a3ea5df5 EI	568
163bf3a5	569	static void eth_cleanup(VLANClientState *nc)
b946a153	570	{
163bf3a5	571	struct fs_eth *eth = DO_UPCAST(NICState, nc, nc)->opaque;
b946a153	572
1da005b3 EI	573	/* Disconnect the client. */
	574	eth->dma_out->client.push = NULL;
	575	eth->dma_out->client.opaque = NULL;
	576	eth->dma_in->client.opaque = NULL;
	577	eth->dma_in->client.pull = NULL;
7267c094	578	g_free(eth);
b946a153 AL	579	}
b946a153 AL	580
163bf3a5 MM	581	static NetClientInfo net_etraxfs_info = {
	582	.type = NET_CLIENT_TYPE_NIC,
	583	.size = sizeof(NICState),
	584	.can_receive = eth_can_receive,
	585	.receive = eth_receive,
	586	.cleanup = eth_cleanup,
	587	.link_status_changed = eth_set_link,
	588	};
	589
d949396e	590	static int fs_eth_init(SysBusDevice *dev)
a3ea5df5	591	{
d949396e	592	struct fs_eth s = FROM_SYSBUS(typeof(s), dev);
a3ea5df5	593
d949396e EI	594	if (!s->dma_out \|\| !s->dma_in) {
	595	hw_error("Unconnected ETRAX-FS Ethernet MAC.\n");
	596	}
a3ea5df5	597
d949396e EI	598	s->dma_out->client.push = eth_tx_push;
	599	s->dma_out->client.opaque = s;
	600	s->dma_in->client.opaque = s;
	601	s->dma_in->client.pull = NULL;
a3ea5df5	602
06dccb82	603	memory_region_init_io(&s->mmio, &eth_ops, s, "etraxfs-eth", 0x5c);
750ecd44	604	sysbus_init_mmio(dev, &s->mmio);
a3ea5df5	605
d949396e EI	606	qemu_macaddr_default_if_unset(&s->conf.macaddr);
	607	s->nic = qemu_new_nic(&net_etraxfs_info, &s->conf,
	608	dev->qdev.info->name, dev->qdev.id, s);
	609	qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a);
a3ea5df5	610
d949396e EI	611	tdk_init(&s->phy);
	612	mdio_attach(&s->mdio_bus, &s->phy, s->phyaddr);
	613	return 0;
	614	}
a3ea5df5	615
d949396e EI	616	static SysBusDeviceInfo etraxfs_eth_info = {
	617	.init = fs_eth_init,
	618	.qdev.name = "etraxfs-eth",
	619	.qdev.size = sizeof(struct fs_eth),
	620	.qdev.props = (Property[]) {
	621	DEFINE_PROP_UINT32("phyaddr", struct fs_eth, phyaddr, 1),
	622	DEFINE_PROP_PTR("dma_out", struct fs_eth, vdma_out),
	623	DEFINE_PROP_PTR("dma_in", struct fs_eth, vdma_in),
	624	DEFINE_NIC_PROPERTIES(struct fs_eth, conf),
	625	DEFINE_PROP_END_OF_LIST(),
	626	}
	627	};
163bf3a5	628
d949396e EI	629	static void etraxfs_eth_register(void)
	630	{
	631	sysbus_register_withprop(&etraxfs_eth_info);
a3ea5df5	632	}
d949396e EI	633
d949396e EI	634	device_init(etraxfs_eth_register)