/*
	drivers/net/ethernet/dec/tulip/eeprom.c

	Copyright 2000,2001  The Linux Kernel Team
	Written/copyright 1994-2001 by Donald Becker.

	This software may be used and distributed according to the terms
	of the GNU General Public License, incorporated herein by reference.

	Please submit bug reports to http://bugzilla.kernel.org/.
*/

#include <linux/pci.h>
#include <linux/slab.h>
#include "tulip.h"
#include <asm/unaligned.h>


/* Serial EEPROM section. */
/* The main routine to parse the very complicated SROM structure.
   Search www.digital.com for "21X4 SROM" to get details.
   This code is very complex, and will require changes to support
   additional cards, so I'll be verbose about what is going on.
   */

/* Known cards that have old-style EEPROMs. */
static struct eeprom_fixup eeprom_fixups[] = {
  {"Asante", 0, 0, 0x94, {0x1e00, 0x0000, 0x0800, 0x0100, 0x018c,
			  0x0000, 0x0000, 0xe078, 0x0001, 0x0050, 0x0018 }},
  {"SMC9332DST", 0, 0, 0xC0, { 0x1e00, 0x0000, 0x0800, 0x041f,
			   0x0000, 0x009E, /* 10baseT */
			   0x0004, 0x009E, /* 10baseT-FD */
			   0x0903, 0x006D, /* 100baseTx */
			   0x0905, 0x006D, /* 100baseTx-FD */ }},
  {"Cogent EM100", 0, 0, 0x92, { 0x1e00, 0x0000, 0x0800, 0x063f,
				 0x0107, 0x8021, /* 100baseFx */
				 0x0108, 0x8021, /* 100baseFx-FD */
				 0x0100, 0x009E, /* 10baseT */
				 0x0104, 0x009E, /* 10baseT-FD */
				 0x0103, 0x006D, /* 100baseTx */
				 0x0105, 0x006D, /* 100baseTx-FD */ }},
  {"Maxtech NX-110", 0, 0, 0xE8, { 0x1e00, 0x0000, 0x0800, 0x0513,
				   0x1001, 0x009E, /* 10base2, CSR12 0x10*/
				   0x0000, 0x009E, /* 10baseT */
				   0x0004, 0x009E, /* 10baseT-FD */
				   0x0303, 0x006D, /* 100baseTx, CSR12 0x03 */
				   0x0305, 0x006D, /* 100baseTx-FD CSR12 0x03 */}},
  {"Accton EN1207", 0, 0, 0xE8, { 0x1e00, 0x0000, 0x0800, 0x051F,
				  0x1B01, 0x0000, /* 10base2,   CSR12 0x1B */
				  0x0B00, 0x009E, /* 10baseT,   CSR12 0x0B */
				  0x0B04, 0x009E, /* 10baseT-FD,CSR12 0x0B */
				  0x1B03, 0x006D, /* 100baseTx, CSR12 0x1B */
				  0x1B05, 0x006D, /* 100baseTx-FD CSR12 0x1B */
   }},
  {"NetWinder", 0x00, 0x10, 0x57,
	/* Default media = MII
	 * MII block, reset sequence (3) = 0x0821 0x0000 0x0001, capabilities 0x01e1
	 */
	{ 0x1e00, 0x0000, 0x000b, 0x8f01, 0x0103, 0x0300, 0x0821, 0x000, 0x0001, 0x0000, 0x01e1 }
  },
  {"Cobalt Microserver", 0, 0x10, 0xE0, {0x1e00, /* 0 == controller #, 1e == offset	*/
					 0x0000, /* 0 == high offset, 0 == gap		*/
					 0x0800, /* Default Autoselect			*/
					 0x8001, /* 1 leaf, extended type, bogus len	*/
					 0x0003, /* Type 3 (MII), PHY #0		*/
					 0x0400, /* 0 init instr, 4 reset instr		*/
					 0x0801, /* Set control mode, GP0 output	*/
					 0x0000, /* Drive GP0 Low (RST is active low)	*/
					 0x0800, /* control mode, GP0 input (undriven)	*/
					 0x0000, /* clear control mode			*/
					 0x7800, /* 100TX FDX + HDX, 10bT FDX + HDX	*/
					 0x01e0, /* Advertise all above			*/
					 0x5000, /* FDX all above			*/
					 0x1800, /* Set fast TTM in 100bt modes		*/
					 0x0000, /* PHY cannot be unplugged		*/
  }},
  {NULL}};


static const char *const block_name[] = {
	"21140 non-MII",
	"21140 MII PHY",
	"21142 Serial PHY",
	"21142 MII PHY",
	"21143 SYM PHY",
	"21143 reset method"
};


/**
 * tulip_build_fake_mediatable - Build a fake mediatable entry.
 * @tp: Ptr to the tulip private data.
 *
 * Some cards like the 3x5 HSC cards (J3514A) do not have a standard
 * srom and can not be handled under the fixup routine.  These cards
 * still need a valid mediatable entry for correct csr12 setup and
 * mii handling.
 *
 * Since this is currently a parisc-linux specific function, the
 * #ifdef __hppa__ should completely optimize this function away for
 * non-parisc hardware.
 */
static void tulip_build_fake_mediatable(struct tulip_private *tp)
{
#ifdef CONFIG_GSC
	if (tp->flags & NEEDS_FAKE_MEDIA_TABLE) {
		static unsigned char leafdata[] =
			{ 0x01,       /* phy number */
			  0x02,       /* gpr setup sequence length */
			  0x02, 0x00, /* gpr setup sequence */
			  0x02,       /* phy reset sequence length */
			  0x01, 0x00, /* phy reset sequence */
			  0x00, 0x78, /* media capabilities */
			  0x00, 0xe0, /* nway advertisement */
			  0x00, 0x05, /* fdx bit map */
			  0x00, 0x06  /* ttm bit map */
			};

		tp->mtable = devm_kmalloc(&tp->pdev->dev, sizeof(struct mediatable) +
					  sizeof(struct medialeaf), GFP_KERNEL);

		if (tp->mtable == NULL)
			return; /* Horrible, impossible failure. */

		tp->mtable->defaultmedia = 0x800;
		tp->mtable->leafcount = 1;
		tp->mtable->csr12dir = 0x3f; /* inputs on bit7 for hsc-pci, bit6 for pci-fx */
		tp->mtable->has_nonmii = 0;
		tp->mtable->has_reset = 0;
		tp->mtable->has_mii = 1;
		tp->mtable->csr15dir = tp->mtable->csr15val = 0;
		tp->mtable->mleaf[0].type = 1;
		tp->mtable->mleaf[0].media = 11;
		tp->mtable->mleaf[0].leafdata = &leafdata[0];
		tp->flags |= HAS_PHY_IRQ;
		tp->csr12_shadow = -1;
	}
#endif
}

void tulip_parse_eeprom(struct net_device *dev)
{
	/*
	  dev is not registered at this point, so logging messages can't
	  use dev_<level> or netdev_<level> but dev->name is good via a
	  hack in the caller
	*/

	/* The last media info list parsed, for multiport boards.  */
	static struct mediatable *last_mediatable;
	static unsigned char *last_ee_data;
	static int controller_index;
	struct tulip_private *tp = netdev_priv(dev);
	unsigned char *ee_data = tp->eeprom;
	int i;

	tp->mtable = NULL;
	/* Detect an old-style (SA only) EEPROM layout:
	   memcmp(eedata, eedata+16, 8). */
	for (i = 0; i < 8; i ++)
		if (ee_data[i] != ee_data[16+i])
			break;
	if (i >= 8) {
		if (ee_data[0] == 0xff) {
			if (last_mediatable) {
				controller_index++;
				pr_info("%s: Controller %d of multiport board\n",
					dev->name, controller_index);
				tp->mtable = last_mediatable;
				ee_data = last_ee_data;
				goto subsequent_board;
			} else
				pr_info("%s: Missing EEPROM, this interface may not work correctly!\n",
					dev->name);
			return;
		}
	  /* Do a fix-up based on the vendor half of the station address prefix. */
	  for (i = 0; eeprom_fixups[i].name; i++) {
		  if (dev->dev_addr[0] == eeprom_fixups[i].addr0 &&
		      dev->dev_addr[1] == eeprom_fixups[i].addr1 &&
		      dev->dev_addr[2] == eeprom_fixups[i].addr2) {
		  if (dev->dev_addr[2] == 0xE8 && ee_data[0x1a] == 0x55)
			  i++;			/* An Accton EN1207, not an outlaw Maxtech. */
		  memcpy(ee_data + 26, eeprom_fixups[i].newtable,
				 sizeof(eeprom_fixups[i].newtable));
		  pr_info("%s: Old format EEPROM on '%s' board.  Using substitute media control info\n",
			  dev->name, eeprom_fixups[i].name);
		  break;
		}
	  }
	  if (eeprom_fixups[i].name == NULL) { /* No fixup found. */
		  pr_info("%s: Old style EEPROM with no media selection information\n",
			  dev->name);
		return;
	  }
	}

	controller_index = 0;
	if (ee_data[19] > 1) {		/* Multiport board. */
		last_ee_data = ee_data;
	}
subsequent_board:

	if (ee_data[27] == 0) {		/* No valid media table. */
		tulip_build_fake_mediatable(tp);
	} else {
		unsigned char *p = (void *)ee_data + ee_data[27];
		unsigned char csr12dir = 0;
		int count, new_advertise = 0;
		struct mediatable *mtable;
		u16 media = get_u16(p);

		p += 2;
		if (tp->flags & CSR12_IN_SROM)
			csr12dir = *p++;
		count = *p++;

	        /* there is no phy information, don't even try to build mtable */
	        if (count == 0) {
			if (tulip_debug > 0)
				pr_warn("%s: no phy info, aborting mtable build\n",
					dev->name);
		        return;
		}

		mtable = devm_kmalloc(&tp->pdev->dev, struct_size(mtable, mleaf, count),
				      GFP_KERNEL);
		if (mtable == NULL)
			return;				/* Horrible, impossible failure. */
		last_mediatable = tp->mtable = mtable;
		mtable->defaultmedia = media;
		mtable->leafcount = count;
		mtable->csr12dir = csr12dir;
		mtable->has_nonmii = mtable->has_mii = mtable->has_reset = 0;
		mtable->csr15dir = mtable->csr15val = 0;

		pr_info("%s: EEPROM default media type %s\n",
			dev->name,
			media & 0x0800 ? "Autosense"
				       : medianame[media & MEDIA_MASK]);
		for (i = 0; i < count; i++) {
			struct medialeaf *leaf = &mtable->mleaf[i];

			if ((p[0] & 0x80) == 0) { /* 21140 Compact block. */
				leaf->type = 0;
				leaf->media = p[0] & 0x3f;
				leaf->leafdata = p;
				if ((p[2] & 0x61) == 0x01)	/* Bogus, but Znyx boards do it. */
					mtable->has_mii = 1;
				p += 4;
			} else {
				leaf->type = p[1];
				if (p[1] == 0x05) {
					mtable->has_reset = i;
					leaf->media = p[2] & 0x0f;
				} else if (tp->chip_id == DM910X && p[1] == 0x80) {
					/* Hack to ignore Davicom delay period block */
					mtable->leafcount--;
					count--;
					i--;
					leaf->leafdata = p + 2;
					p += (p[0] & 0x3f) + 1;
					continue;
				} else if (p[1] & 1) {
					int gpr_len, reset_len;

					mtable->has_mii = 1;
					leaf->media = 11;
					gpr_len=p[3]*2;
					reset_len=p[4+gpr_len]*2;
					new_advertise |= get_u16(&p[7+gpr_len+reset_len]);
				} else {
					mtable->has_nonmii = 1;
					leaf->media = p[2] & MEDIA_MASK;
					/* Davicom's media number for 100BaseTX is strange */
					if (tp->chip_id == DM910X && leaf->media == 1)
						leaf->media = 3;
					switch (leaf->media) {
					case 0: new_advertise |= 0x0020; break;
					case 4: new_advertise |= 0x0040; break;
					case 3: new_advertise |= 0x0080; break;
					case 5: new_advertise |= 0x0100; break;
					case 6: new_advertise |= 0x0200; break;
					}
					if (p[1] == 2  &&  leaf->media == 0) {
						if (p[2] & 0x40) {
							u32 base15 = get_unaligned((u16*)&p[7]);
							mtable->csr15dir =
								(get_unaligned((u16*)&p[9])<<16) + base15;
							mtable->csr15val =
								(get_unaligned((u16*)&p[11])<<16) + base15;
						} else {
							mtable->csr15dir = get_unaligned((u16*)&p[3])<<16;
							mtable->csr15val = get_unaligned((u16*)&p[5])<<16;
						}
					}
				}
				leaf->leafdata = p + 2;
				p += (p[0] & 0x3f) + 1;
			}
			if (tulip_debug > 1  &&  leaf->media == 11) {
				unsigned char *bp = leaf->leafdata;
				pr_info("%s: MII interface PHY %d, setup/reset sequences %d/%d long, capabilities %02x %02x\n",
					dev->name,
					bp[0], bp[1], bp[2 + bp[1]*2],
					bp[5 + bp[2 + bp[1]*2]*2],
					bp[4 + bp[2 + bp[1]*2]*2]);
			}
			pr_info("%s: Index #%d - Media %s (#%d) described by a %s (%d) block\n",
				dev->name,
				i, medianame[leaf->media & 15], leaf->media,
				leaf->type < ARRAY_SIZE(block_name) ? block_name[leaf->type] : "<unknown>",
				leaf->type);
		}
		if (new_advertise)
			tp->sym_advertise = new_advertise;
	}
}
/* Reading a serial EEPROM is a "bit" grungy, but we work our way through:->.*/

/*  EEPROM_Ctrl bits. */
#define EE_SHIFT_CLK	0x02	/* EEPROM shift clock. */
#define EE_CS		0x01	/* EEPROM chip select. */
#define EE_DATA_WRITE	0x04	/* Data from the Tulip to EEPROM. */
#define EE_WRITE_0	0x01
#define EE_WRITE_1	0x05
#define EE_DATA_READ	0x08	/* Data from the EEPROM chip. */
#define EE_ENB		(0x4800 | EE_CS)

/* Delay between EEPROM clock transitions.
   Even at 33Mhz current PCI implementations don't overrun the EEPROM clock.
   We add a bus turn-around to insure that this remains true. */
#define eeprom_delay()	ioread32(ee_addr)

/* The EEPROM commands include the alway-set leading bit. */
#define EE_READ_CMD		(6)

/* Note: this routine returns extra data bits for size detection. */
int tulip_read_eeprom(struct net_device *dev, int location, int addr_len)
{
	int i;
	unsigned retval = 0;
	struct tulip_private *tp = netdev_priv(dev);
	void __iomem *ee_addr = tp->base_addr + CSR9;
	int read_cmd = location | (EE_READ_CMD << addr_len);

	/* If location is past the end of what we can address, don't
	 * read some other location (ie truncate). Just return zero.
	 */
	if (location > (1 << addr_len) - 1)
		return 0;

	iowrite32(EE_ENB & ~EE_CS, ee_addr);
	iowrite32(EE_ENB, ee_addr);

	/* Shift the read command bits out. */
	for (i = 4 + addr_len; i >= 0; i--) {
		short dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
		iowrite32(EE_ENB | dataval, ee_addr);
		eeprom_delay();
		iowrite32(EE_ENB | dataval | EE_SHIFT_CLK, ee_addr);
		eeprom_delay();
		retval = (retval << 1) | ((ioread32(ee_addr) & EE_DATA_READ) ? 1 : 0);
	}
	iowrite32(EE_ENB, ee_addr);
	eeprom_delay();

	for (i = 16; i > 0; i--) {
		iowrite32(EE_ENB | EE_SHIFT_CLK, ee_addr);
		eeprom_delay();
		retval = (retval << 1) | ((ioread32(ee_addr) & EE_DATA_READ) ? 1 : 0);
		iowrite32(EE_ENB, ee_addr);
		eeprom_delay();
	}

	/* Terminate the EEPROM access. */
	iowrite32(EE_ENB & ~EE_CS, ee_addr);
	return (tp->flags & HAS_SWAPPED_SEEPROM) ? swab16(retval) : retval;
}