1

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

     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.,

    17

  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

	eecd &= ~(E1000_EECD_DO | E1000_EECD_DI);

   121

	data = 0;

   122

   123

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

   124

		data <<= 1;

   125

		e1000_raise_eec_clk(hw, &eecd);

   126

   127

		eecd = er32(EECD);

   128

   129

		eecd &= ~E1000_EECD_DI;

   130

		if (eecd & E1000_EECD_DO)

   131

			data |= 1;

   132

   133

		e1000_lower_eec_clk(hw, &eecd);

   134

	}

   135

   136

	return data;

   137

}

   138

   139

/**

   140

 *  e1000e_poll_eerd_eewr_done - Poll for EEPROM read/write completion

   141

 *  @hw: pointer to the HW structure

   142

 *  @ee_reg: EEPROM flag for polling

   143

 *

   144

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

   145

 *  upon the value of 'ee_reg'.

   146

 **/

   147

s32 e1000e_poll_eerd_eewr_done(struct e1000_hw *hw, int ee_reg)

   148

{

   149

	u32 attempts = 100000;

   150

	u32 i, reg = 0;

   151

   152

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

   153

		if (ee_reg == E1000_NVM_POLL_READ)

   154

			reg = er32(EERD);

   155

		else

   156

			reg = er32(EEWR);

   157

   158

		if (reg & E1000_NVM_RW_REG_DONE)

   159

			return 0;

   160

   161

		udelay(5);

   162

	}

   163

   164

	return -E1000_ERR_NVM;

   165

}

   166

   167

/**

   168

 *  e1000e_acquire_nvm - Generic request for access to EEPROM

   169

 *  @hw: pointer to the HW structure

   170

 *

   171

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

   172

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

   173

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

   174

 **/

   175

s32 e1000e_acquire_nvm(struct e1000_hw *hw)

   176

{

   177

	u32 eecd = er32(EECD);

   178

	s32 timeout = E1000_NVM_GRANT_ATTEMPTS;

   179

   180

	ew32(EECD, eecd | E1000_EECD_REQ);

   181

	eecd = er32(EECD);

   182

   183

	while (timeout) {

   184

		if (eecd & E1000_EECD_GNT)

   185

			break;

   186

		udelay(5);

   187

		eecd = er32(EECD);

   188

		timeout--;

   189

	}

   190

   191

	if (!timeout) {

   192

		eecd &= ~E1000_EECD_REQ;

   193

		ew32(EECD, eecd);

   194

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

   195

		return -E1000_ERR_NVM;

   196

	}

   197

   198

	return 0;

   199

}

   200

   201

/**

   202

 *  e1000_standby_nvm - Return EEPROM to standby state

   203

 *  @hw: pointer to the HW structure

   204

 *

   205

 *  Return the EEPROM to a standby state.

   206

 **/

   207

static void e1000_standby_nvm(struct e1000_hw *hw)

   208

{

   209

	struct e1000_nvm_info *nvm = &hw->nvm;

   210

	u32 eecd = er32(EECD);

   211

   212

	if (nvm->type == e1000_nvm_eeprom_spi) {

   213

		/* Toggle CS to flush commands */

   214

		eecd |= E1000_EECD_CS;

   215

		ew32(EECD, eecd);

   216

		e1e_flush();

   217

		udelay(nvm->delay_usec);

   218

		eecd &= ~E1000_EECD_CS;

   219

		ew32(EECD, eecd);

   220

		e1e_flush();

   221

		udelay(nvm->delay_usec);

   222

	}

   223

}

   224

   225

/**

   226

 *  e1000_stop_nvm - Terminate EEPROM command

   227

 *  @hw: pointer to the HW structure

   228

 *

   229

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

   230

 **/

   231

static void e1000_stop_nvm(struct e1000_hw *hw)

   232

{

   233

	u32 eecd;

   234

   235

	eecd = er32(EECD);

   236

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

   237

		/* Pull CS high */

   238

		eecd |= E1000_EECD_CS;

   239

		e1000_lower_eec_clk(hw, &eecd);

   240

	}

   241

}

   242

   243

/**

   244

 *  e1000e_release_nvm - Release exclusive access to EEPROM

   245

 *  @hw: pointer to the HW structure

   246

 *

   247

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

   248

 **/

   249

void e1000e_release_nvm(struct e1000_hw *hw)

   250

{

   251

	u32 eecd;

   252

   253

	e1000_stop_nvm(hw);

   254

   255

	eecd = er32(EECD);

   256

	eecd &= ~E1000_EECD_REQ;

   257

	ew32(EECD, eecd);

   258

}

   259

   260

/**

   261

 *  e1000_ready_nvm_eeprom - Prepares EEPROM for read/write

   262

 *  @hw: pointer to the HW structure

   263

 *

   264

 *  Setups the EEPROM for reading and writing.

   265

 **/

   266

static s32 e1000_ready_nvm_eeprom(struct e1000_hw *hw)

   267

{

   268

	struct e1000_nvm_info *nvm = &hw->nvm;

   269

	u32 eecd = er32(EECD);

   270

	u8 spi_stat_reg;

   271

   272

	if (nvm->type == e1000_nvm_eeprom_spi) {

   273

		u16 timeout = NVM_MAX_RETRY_SPI;

   274

   275

		/* Clear SK and CS */

   276

		eecd &= ~(E1000_EECD_CS | E1000_EECD_SK);

   277

		ew32(EECD, eecd);

   278

		e1e_flush();

   279

		udelay(1);

   280

   281

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

   282

		 * The EEPROM will signal that the command has been completed

   283

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

   284

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

   285

		 */

   286

		while (timeout) {

   287

			e1000_shift_out_eec_bits(hw, NVM_RDSR_OPCODE_SPI,

   288

						 hw->nvm.opcode_bits);

   289

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

   290

			if (!(spi_stat_reg & NVM_STATUS_RDY_SPI))

   291

				break;

   292

   293

			udelay(5);

   294

			e1000_standby_nvm(hw);

   295

			timeout--;

   296

		}

   297

   298

		if (!timeout) {

   299

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

   300

			return -E1000_ERR_NVM;

   301

		}

   302

	}

   303

   304

	return 0;

   305

}

   306

   307

/**

   308

 *  e1000e_read_nvm_eerd - Reads EEPROM using EERD register

   309

 *  @hw: pointer to the HW structure

   310

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

   311

 *  @words: number of words to read

   312

 *  @data: word read from the EEPROM

   313

 *

   314

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

   315

 **/

   316

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

   317

{

   318

	struct e1000_nvm_info *nvm = &hw->nvm;

   319

	u32 i, eerd = 0;

   320

	s32 ret_val = 0;

   321

   322

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

   323

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

   324

	 */

   325

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

   326

	    (words == 0)) {

   327

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

   328

		return -E1000_ERR_NVM;

   329

	}

   330

   331

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

   332

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

   333

		    E1000_NVM_RW_REG_START;

   334

   335

		ew32(EERD, eerd);

   336

		ret_val = e1000e_poll_eerd_eewr_done(hw, E1000_NVM_POLL_READ);

   337

		if (ret_val)

   338

			break;

   339

   340

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

   341

	}

   342

   343

	return ret_val;

   344

}

   345

   346

/**

   347

 *  e1000e_write_nvm_spi - Write to EEPROM using SPI

   348

 *  @hw: pointer to the HW structure

   349

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

   350

 *  @words: number of words to write

   351

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

   352

 *

   353

 *  Writes data to EEPROM at offset using SPI interface.

   354

 *

   355

 *  If e1000e_update_nvm_checksum is not called after this function , the

   356

 *  EEPROM will most likely contain an invalid checksum.

   357

 **/

   358

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

   359

{

   360

	struct e1000_nvm_info *nvm = &hw->nvm;

   361

	s32 ret_val = -E1000_ERR_NVM;

   362

	u16 widx = 0;

   363

   364

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

   365

	 * and not enough words.

   366

	 */

   367

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

   368

	    (words == 0)) {

   369

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

   370

		return -E1000_ERR_NVM;

   371

	}

   372

   373

	while (widx < words) {

   374

		u8 write_opcode = NVM_WRITE_OPCODE_SPI;

   375

   376

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

   377

		if (ret_val)

   378

			return ret_val;

   379

   380

		ret_val = e1000_ready_nvm_eeprom(hw);

   381

		if (ret_val) {

   382

			nvm->ops.release(hw);

   383

			return ret_val;

   384

		}

   385

   386

		e1000_standby_nvm(hw);

   387

   388

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

   389

		e1000_shift_out_eec_bits(hw, NVM_WREN_OPCODE_SPI,

   390

					 nvm->opcode_bits);

   391

   392

		e1000_standby_nvm(hw);

   393

   394

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

   395

		 * opcode

   396

		 */

   397

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

   398

			write_opcode |= NVM_A8_OPCODE_SPI;

   399

   400

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

   401

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

   402

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

   403

					 nvm->address_bits);

   404

   405

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

   406

		while (widx < words) {

   407

			u16 word_out = data[widx];

   408

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

   409

			e1000_shift_out_eec_bits(hw, word_out, 16);

   410

			widx++;

   411

   412

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

   413

				e1000_standby_nvm(hw);

   414

				break;

   415

			}

   416

		}

   417

		usleep_range(10000, 20000);

   418

		nvm->ops.release(hw);

   419

	}

   420

   421

	return ret_val;

   422

}

   423

   424

/**

   425

 *  e1000_read_pba_string_generic - Read device part number

   426

 *  @hw: pointer to the HW structure

   427

 *  @pba_num: pointer to device part number

   428

 *  @pba_num_size: size of part number buffer

   429

 *

   430

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

   431

 *  the value in pba_num.

   432

 **/

   433

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

   434

				  u32 pba_num_size)

   435

{

   436

	s32 ret_val;

   437

	u16 nvm_data;

   438

	u16 pba_ptr;

   439

	u16 offset;

   440

	u16 length;

   441

   442

	if (pba_num == NULL) {

   443

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

   444

		return -E1000_ERR_INVALID_ARGUMENT;

   445

	}

   446

   447

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

   448

	if (ret_val) {

   449

		e_dbg("NVM Read Error\n");

   450

		return ret_val;

   451

	}

   452

   453

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

   454

	if (ret_val) {

   455

		e_dbg("NVM Read Error\n");

   456

		return ret_val;

   457

	}

   458

   459

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

   460

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

   461

	 * and we can decode it into an ascii string

   462

	 */

   463

	if (nvm_data != NVM_PBA_PTR_GUARD) {

   464

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

   465

   466

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

   467

		if (pba_num_size < E1000_PBANUM_LENGTH) {

   468

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

   469

			return E1000_ERR_NO_SPACE;

   470

		}

   471

   472

		/* extract hex string from data and pba_ptr */

   473

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

   474

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

   475

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

   476

		pba_num[3] = nvm_data & 0xF;

   477

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

   478

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

   479

		pba_num[6] = '-';

   480

		pba_num[7] = 0;

   481

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

   482

		pba_num[9] = pba_ptr & 0xF;

   483

   484

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

   485

		pba_num[10] = '\0';

   486

   487

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

   488

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

   489

			if (pba_num[offset] < 0xA)

   490

				pba_num[offset] += '0';

   491

			else if (pba_num[offset] < 0x10)

   492

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

   493

		}

   494

   495

		return 0;

   496

	}

   497

   498

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

   499

	if (ret_val) {

   500

		e_dbg("NVM Read Error\n");

   501

		return ret_val;

   502

	}

   503

   504

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

   505

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

   506

		return -E1000_ERR_NVM_PBA_SECTION;

   507

	}

   508

	/* check if pba_num buffer is big enough */

   509

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

   510

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

   511

		return -E1000_ERR_NO_SPACE;

   512

	}

   513

   514

	/* trim pba length from start of string */

   515

	pba_ptr++;

   516

	length--;

   517

   518

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

   519

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

   520

		if (ret_val) {

   521

			e_dbg("NVM Read Error\n");

   522

			return ret_val;

   523

		}

   524

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

   525

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

   526

	}

   527

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

   528

   529

	return 0;

   530

}