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/*******************************************************************************

     2

     3

  Intel PRO/1000 Linux driver

     4

  Copyright(c) 1999 - 2013 Intel Corporation.

     5

     6

  This program is free software; you can redistribute it and/or modify it

     7

  under the terms and conditions of the GNU General Public License,

     8

  version 2, as published by the Free Software Foundation.

     9

    10

  This program is distributed in the hope it will be useful, but WITHOUT

    11

  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12

  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

    13

  more details.

    14

    15

  You should have received a copy of the GNU General Public License along with

    16

  this program; if not, write to the Free Software Foundation, Inc.,

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  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

    18

    19

  The full GNU General Public License is included in this distribution in

    20

  the file called "COPYING".

    21

    22

  Contact Information:

    23

  Linux NICS <linux.nics@intel.com>

    24

  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>

    25

  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

    26

    27

*******************************************************************************/

    28

    29

#include "e1000.h"

    30

    31

/**

    32

 *  e1000_raise_eec_clk - Raise EEPROM clock

    33

 *  @hw: pointer to the HW structure

    34

 *  @eecd: pointer to the EEPROM

    35

 *

    36

 *  Enable/Raise the EEPROM clock bit.

    37

 **/

    38

static void e1000_raise_eec_clk(struct e1000_hw *hw, u32 *eecd)

    39

{

    40

	*eecd = *eecd | E1000_EECD_SK;

    41

	ew32(EECD, *eecd);

    42

	e1e_flush();

    43

	udelay(hw->nvm.delay_usec);

    44

}

    45

    46

/**

    47

 *  e1000_lower_eec_clk - Lower EEPROM clock

    48

 *  @hw: pointer to the HW structure

    49

 *  @eecd: pointer to the EEPROM

    50

 *

    51

 *  Clear/Lower the EEPROM clock bit.

    52

 **/

    53

static void e1000_lower_eec_clk(struct e1000_hw *hw, u32 *eecd)

    54

{

    55

	*eecd = *eecd & ~E1000_EECD_SK;

    56

	ew32(EECD, *eecd);

    57

	e1e_flush();

    58

	udelay(hw->nvm.delay_usec);

    59

}

    60

    61

/**

    62

 *  e1000_shift_out_eec_bits - Shift data bits our to the EEPROM

    63

 *  @hw: pointer to the HW structure

    64

 *  @data: data to send to the EEPROM

    65

 *  @count: number of bits to shift out

    66

 *

    67

 *  We need to shift 'count' bits out to the EEPROM.  So, the value in the

    68

 *  "data" parameter will be shifted out to the EEPROM one bit at a time.

    69

 *  In order to do this, "data" must be broken down into bits.

    70

 **/

    71

static void e1000_shift_out_eec_bits(struct e1000_hw *hw, u16 data, u16 count)

    72

{

    73

	struct e1000_nvm_info *nvm = &hw->nvm;

    74

	u32 eecd = er32(EECD);

    75

	u32 mask;

    76

    77

	mask = 0x01 << (count - 1);

    78

	if (nvm->type == e1000_nvm_eeprom_spi)

    79

		eecd |= E1000_EECD_DO;

    80

    81

	do {

    82

		eecd &= ~E1000_EECD_DI;

    83

    84

		if (data & mask)

    85

			eecd |= E1000_EECD_DI;

    86

    87

		ew32(EECD, eecd);

    88

		e1e_flush();

    89

    90

		udelay(nvm->delay_usec);

    91

    92

		e1000_raise_eec_clk(hw, &eecd);

    93

		e1000_lower_eec_clk(hw, &eecd);

    94

    95

		mask >>= 1;

    96

	} while (mask);

    97

    98

	eecd &= ~E1000_EECD_DI;

    99

	ew32(EECD, eecd);

   100

}

   101

   102

/**

   103

 *  e1000_shift_in_eec_bits - Shift data bits in from the EEPROM

   104

 *  @hw: pointer to the HW structure

   105

 *  @count: number of bits to shift in

   106

 *

   107

 *  In order to read a register from the EEPROM, we need to shift 'count' bits

   108

 *  in from the EEPROM.  Bits are "shifted in" by raising the clock input to

   109

 *  the EEPROM (setting the SK bit), and then reading the value of the data out

   110

 *  "DO" bit.  During this "shifting in" process the data in "DI" bit should

   111

 *  always be clear.

   112

 **/

   113

static u16 e1000_shift_in_eec_bits(struct e1000_hw *hw, u16 count)

   114

{

   115

	u32 eecd;

   116

	u32 i;

   117

	u16 data;

   118

   119

	eecd = er32(EECD);

   120

   121

	eecd &= ~(E1000_EECD_DO | E1000_EECD_DI);

   122

	data = 0;

   123

   124

	for (i = 0; i < count; i++) {

   125

		data <<= 1;

   126

		e1000_raise_eec_clk(hw, &eecd);

   127

   128

		eecd = er32(EECD);

   129

   130

		eecd &= ~E1000_EECD_DI;

   131

		if (eecd & E1000_EECD_DO)

   132

			data |= 1;

   133

   134

		e1000_lower_eec_clk(hw, &eecd);

   135

	}

   136

   137

	return data;

   138

}

   139

   140

/**

   141

 *  e1000e_poll_eerd_eewr_done - Poll for EEPROM read/write completion

   142

 *  @hw: pointer to the HW structure

   143

 *  @ee_reg: EEPROM flag for polling

   144

 *

   145

 *  Polls the EEPROM status bit for either read or write completion based

   146

 *  upon the value of 'ee_reg'.

   147

 **/

   148

s32 e1000e_poll_eerd_eewr_done(struct e1000_hw *hw, int ee_reg)

   149

{

   150

	u32 attempts = 100000;

   151

	u32 i, reg = 0;

   152

   153

	for (i = 0; i < attempts; i++) {

   154

		if (ee_reg == E1000_NVM_POLL_READ)

   155

			reg = er32(EERD);

   156

		else

   157

			reg = er32(EEWR);

   158

   159

		if (reg & E1000_NVM_RW_REG_DONE)

   160

			return 0;

   161

   162

		udelay(5);

   163

	}

   164

   165

	return -E1000_ERR_NVM;

   166

}

   167

   168

/**

   169

 *  e1000e_acquire_nvm - Generic request for access to EEPROM

   170

 *  @hw: pointer to the HW structure

   171

 *

   172

 *  Set the EEPROM access request bit and wait for EEPROM access grant bit.

   173

 *  Return successful if access grant bit set, else clear the request for

   174

 *  EEPROM access and return -E1000_ERR_NVM (-1).

   175

 **/

   176

s32 e1000e_acquire_nvm(struct e1000_hw *hw)

   177

{

   178

	u32 eecd = er32(EECD);

   179

	s32 timeout = E1000_NVM_GRANT_ATTEMPTS;

   180

   181

	ew32(EECD, eecd | E1000_EECD_REQ);

   182

	eecd = er32(EECD);

   183

   184

	while (timeout) {

   185

		if (eecd & E1000_EECD_GNT)

   186

			break;

   187

		udelay(5);

   188

		eecd = er32(EECD);

   189

		timeout--;

   190

	}

   191

   192

	if (!timeout) {

   193

		eecd &= ~E1000_EECD_REQ;

   194

		ew32(EECD, eecd);

   195

		e_dbg("Could not acquire NVM grant\n");

   196

		return -E1000_ERR_NVM;

   197

	}

   198

   199

	return 0;

   200

}

   201

   202

/**

   203

 *  e1000_standby_nvm - Return EEPROM to standby state

   204

 *  @hw: pointer to the HW structure

   205

 *

   206

 *  Return the EEPROM to a standby state.

   207

 **/

   208

static void e1000_standby_nvm(struct e1000_hw *hw)

   209

{

   210

	struct e1000_nvm_info *nvm = &hw->nvm;

   211

	u32 eecd = er32(EECD);

   212

   213

	if (nvm->type == e1000_nvm_eeprom_spi) {

   214

		/* Toggle CS to flush commands */

   215

		eecd |= E1000_EECD_CS;

   216

		ew32(EECD, eecd);

   217

		e1e_flush();

   218

		udelay(nvm->delay_usec);

   219

		eecd &= ~E1000_EECD_CS;

   220

		ew32(EECD, eecd);

   221

		e1e_flush();

   222

		udelay(nvm->delay_usec);

   223

	}

   224

}

   225

   226

/**

   227

 *  e1000_stop_nvm - Terminate EEPROM command

   228

 *  @hw: pointer to the HW structure

   229

 *

   230

 *  Terminates the current command by inverting the EEPROM's chip select pin.

   231

 **/

   232

static void e1000_stop_nvm(struct e1000_hw *hw)

   233

{

   234

	u32 eecd;

   235

   236

	eecd = er32(EECD);

   237

	if (hw->nvm.type == e1000_nvm_eeprom_spi) {

   238

		/* Pull CS high */

   239

		eecd |= E1000_EECD_CS;

   240

		e1000_lower_eec_clk(hw, &eecd);

   241

	}

   242

}

   243

   244

/**

   245

 *  e1000e_release_nvm - Release exclusive access to EEPROM

   246

 *  @hw: pointer to the HW structure

   247

 *

   248

 *  Stop any current commands to the EEPROM and clear the EEPROM request bit.

   249

 **/

   250

void e1000e_release_nvm(struct e1000_hw *hw)

   251

{

   252

	u32 eecd;

   253

   254

	e1000_stop_nvm(hw);

   255

   256

	eecd = er32(EECD);

   257

	eecd &= ~E1000_EECD_REQ;

   258

	ew32(EECD, eecd);

   259

}

   260

   261

/**

   262

 *  e1000_ready_nvm_eeprom - Prepares EEPROM for read/write

   263

 *  @hw: pointer to the HW structure

   264

 *

   265

 *  Setups the EEPROM for reading and writing.

   266

 **/

   267

static s32 e1000_ready_nvm_eeprom(struct e1000_hw *hw)

   268

{

   269

	struct e1000_nvm_info *nvm = &hw->nvm;

   270

	u32 eecd = er32(EECD);

   271

	u8 spi_stat_reg;

   272

   273

	if (nvm->type == e1000_nvm_eeprom_spi) {

   274

		u16 timeout = NVM_MAX_RETRY_SPI;

   275

   276

		/* Clear SK and CS */

   277

		eecd &= ~(E1000_EECD_CS | E1000_EECD_SK);

   278

		ew32(EECD, eecd);

   279

		e1e_flush();

   280

		udelay(1);

   281

   282

		/* Read "Status Register" repeatedly until the LSB is cleared.

   283

		 * The EEPROM will signal that the command has been completed

   284

		 * by clearing bit 0 of the internal status register.  If it's

   285

		 * not cleared within 'timeout', then error out.

   286

		 */

   287

		while (timeout) {

   288

			e1000_shift_out_eec_bits(hw, NVM_RDSR_OPCODE_SPI,

   289

						 hw->nvm.opcode_bits);

   290

			spi_stat_reg = (u8)e1000_shift_in_eec_bits(hw, 8);

   291

			if (!(spi_stat_reg & NVM_STATUS_RDY_SPI))

   292

				break;

   293

   294

			udelay(5);

   295

			e1000_standby_nvm(hw);

   296

			timeout--;

   297

		}

   298

   299

		if (!timeout) {

   300

			e_dbg("SPI NVM Status error\n");

   301

			return -E1000_ERR_NVM;

   302

		}

   303

	}

   304

   305

	return 0;

   306

}

   307

   308

/**

   309

 *  e1000e_read_nvm_eerd - Reads EEPROM using EERD register

   310

 *  @hw: pointer to the HW structure

   311

 *  @offset: offset of word in the EEPROM to read

   312

 *  @words: number of words to read

   313

 *  @data: word read from the EEPROM

   314

 *

   315

 *  Reads a 16 bit word from the EEPROM using the EERD register.

   316

 **/

   317

s32 e1000e_read_nvm_eerd(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)

   318

{

   319

	struct e1000_nvm_info *nvm = &hw->nvm;

   320

	u32 i, eerd = 0;

   321

	s32 ret_val = 0;

   322

   323

	/* A check for invalid values:  offset too large, too many words,

   324

	 * too many words for the offset, and not enough words.

   325

	 */

   326

	if ((offset >= nvm->word_size) || (words > (nvm->word_size - offset)) ||

   327

	    (words == 0)) {

   328

		e_dbg("nvm parameter(s) out of bounds\n");

   329

		return -E1000_ERR_NVM;

   330

	}

   331

   332

	for (i = 0; i < words; i++) {

   333

		eerd = ((offset + i) << E1000_NVM_RW_ADDR_SHIFT) +

   334

		    E1000_NVM_RW_REG_START;

   335

   336

		ew32(EERD, eerd);

   337

		ret_val = e1000e_poll_eerd_eewr_done(hw, E1000_NVM_POLL_READ);

   338

		if (ret_val)

   339

			break;

   340

   341

		data[i] = (er32(EERD) >> E1000_NVM_RW_REG_DATA);

   342

	}

   343

   344

	return ret_val;

   345

}

   346

   347

/**

   348

 *  e1000e_write_nvm_spi - Write to EEPROM using SPI

   349

 *  @hw: pointer to the HW structure

   350

 *  @offset: offset within the EEPROM to be written to

   351

 *  @words: number of words to write

   352

 *  @data: 16 bit word(s) to be written to the EEPROM

   353

 *

   354

 *  Writes data to EEPROM at offset using SPI interface.

   355

 *

   356

 *  If e1000e_update_nvm_checksum is not called after this function , the

   357

 *  EEPROM will most likely contain an invalid checksum.

   358

 **/

   359

s32 e1000e_write_nvm_spi(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)

   360

{

   361

	struct e1000_nvm_info *nvm = &hw->nvm;

   362

	s32 ret_val = -E1000_ERR_NVM;

   363

	u16 widx = 0;

   364

   365

	/* A check for invalid values:  offset too large, too many words,

   366

	 * and not enough words.

   367

	 */

   368

	if ((offset >= nvm->word_size) || (words > (nvm->word_size - offset)) ||

   369

	    (words == 0)) {

   370

		e_dbg("nvm parameter(s) out of bounds\n");

   371

		return -E1000_ERR_NVM;

   372

	}

   373

   374

	while (widx < words) {

   375

		u8 write_opcode = NVM_WRITE_OPCODE_SPI;

   376

   377

		ret_val = nvm->ops.acquire(hw);

   378

		if (ret_val)

   379

			return ret_val;

   380

   381

		ret_val = e1000_ready_nvm_eeprom(hw);

   382

		if (ret_val) {

   383

			nvm->ops.release(hw);

   384

			return ret_val;

   385

		}

   386

   387

		e1000_standby_nvm(hw);

   388

   389

		/* Send the WRITE ENABLE command (8 bit opcode) */

   390

		e1000_shift_out_eec_bits(hw, NVM_WREN_OPCODE_SPI,

   391

					 nvm->opcode_bits);

   392

   393

		e1000_standby_nvm(hw);

   394

   395

		/* Some SPI eeproms use the 8th address bit embedded in the

   396

		 * opcode

   397

		 */

   398

		if ((nvm->address_bits == 8) && (offset >= 128))

   399

			write_opcode |= NVM_A8_OPCODE_SPI;

   400

   401

		/* Send the Write command (8-bit opcode + addr) */

   402

		e1000_shift_out_eec_bits(hw, write_opcode, nvm->opcode_bits);

   403

		e1000_shift_out_eec_bits(hw, (u16)((offset + widx) * 2),

   404

					 nvm->address_bits);

   405

   406

		/* Loop to allow for up to whole page write of eeprom */

   407

		while (widx < words) {

   408

			u16 word_out = data[widx];

   409

			word_out = (word_out >> 8) | (word_out << 8);

   410

			e1000_shift_out_eec_bits(hw, word_out, 16);

   411

			widx++;

   412

   413

			if ((((offset + widx) * 2) % nvm->page_size) == 0) {

   414

				e1000_standby_nvm(hw);

   415

				break;

   416

			}

   417

		}

   418

		usleep_range(10000, 20000);

   419

		nvm->ops.release(hw);

   420

	}

   421

   422

	return ret_val;

   423

}

   424

   425

/**

   426

 *  e1000_read_pba_string_generic - Read device part number

   427

 *  @hw: pointer to the HW structure

   428

 *  @pba_num: pointer to device part number

   429

 *  @pba_num_size: size of part number buffer

   430

 *

   431

 *  Reads the product board assembly (PBA) number from the EEPROM and stores

   432

 *  the value in pba_num.

   433

 **/

   434

s32 e1000_read_pba_string_generic(struct e1000_hw *hw, u8 *pba_num,

   435

				  u32 pba_num_size)

   436

{

   437

	s32 ret_val;

   438

	u16 nvm_data;

   439

	u16 pba_ptr;

   440

	u16 offset;

   441

	u16 length;

   442

   443

	if (pba_num == NULL) {

   444

		e_dbg("PBA string buffer was null\n");

   445

		return -E1000_ERR_INVALID_ARGUMENT;

   446

	}

   447

   448

	ret_val = e1000_read_nvm(hw, NVM_PBA_OFFSET_0, 1, &nvm_data);

   449

	if (ret_val) {

   450

		e_dbg("NVM Read Error\n");

   451

		return ret_val;

   452

	}

   453

   454

	ret_val = e1000_read_nvm(hw, NVM_PBA_OFFSET_1, 1, &pba_ptr);

   455

	if (ret_val) {

   456

		e_dbg("NVM Read Error\n");

   457

		return ret_val;

   458

	}

   459

   460

	/* if nvm_data is not ptr guard the PBA must be in legacy format which

   461

	 * means pba_ptr is actually our second data word for the PBA number

   462

	 * and we can decode it into an ascii string

   463

	 */

   464

	if (nvm_data != NVM_PBA_PTR_GUARD) {

   465

		e_dbg("NVM PBA number is not stored as string\n");

   466

   467

		/* make sure callers buffer is big enough to store the PBA */

   468

		if (pba_num_size < E1000_PBANUM_LENGTH) {

   469

			e_dbg("PBA string buffer too small\n");

   470

			return E1000_ERR_NO_SPACE;

   471

		}

   472

   473

		/* extract hex string from data and pba_ptr */

   474

		pba_num[0] = (nvm_data >> 12) & 0xF;

   475

		pba_num[1] = (nvm_data >> 8) & 0xF;

   476

		pba_num[2] = (nvm_data >> 4) & 0xF;

   477

		pba_num[3] = nvm_data & 0xF;

   478

		pba_num[4] = (pba_ptr >> 12) & 0xF;

   479

		pba_num[5] = (pba_ptr >> 8) & 0xF;

   480

		pba_num[6] = '-';

   481

		pba_num[7] = 0;

   482

		pba_num[8] = (pba_ptr >> 4) & 0xF;

   483

		pba_num[9] = pba_ptr & 0xF;

   484

   485

		/* put a null character on the end of our string */

   486

		pba_num[10] = '\0';

   487

   488

		/* switch all the data but the '-' to hex char */

   489

		for (offset = 0; offset < 10; offset++) {

   490

			if (pba_num[offset] < 0xA)

   491

				pba_num[offset] += '0';

   492

			else if (pba_num[offset] < 0x10)

   493

				pba_num[offset] += 'A' - 0xA;

   494

		}

   495

   496

		return 0;

   497

	}

   498

   499

	ret_val = e1000_read_nvm(hw, pba_ptr, 1, &length);

   500

	if (ret_val) {

   501

		e_dbg("NVM Read Error\n");

   502

		return ret_val;

   503

	}

   504

   505

	if (length == 0xFFFF || length == 0) {

   506

		e_dbg("NVM PBA number section invalid length\n");

   507

		return -E1000_ERR_NVM_PBA_SECTION;

   508

	}

   509

	/* check if pba_num buffer is big enough */

   510

	if (pba_num_size < (((u32)length * 2) - 1)) {

   511

		e_dbg("PBA string buffer too small\n");

   512

		return -E1000_ERR_NO_SPACE;

   513

	}

   514

   515

	/* trim pba length from start of string */

   516

	pba_ptr++;

   517

	length--;

   518

   519

	for (offset = 0; offset < length; offset++) {

   520

		ret_val = e1000_read_nvm(hw, pba_ptr + offset, 1, &nvm_data);

   521

		if (ret_val) {

   522

			e_dbg("NVM Read Error\n");

   523

			return ret_val;

   524

		}

   525

		pba_num[offset * 2] = (u8)(nvm_data >> 8);

   526

		pba_num[(offset * 2) + 1] = (u8)(nvm_data & 0xFF);

   527

	}

   528

	pba_num[offset * 2] = '\0';

   529