Release 4.7 drivers/mtd/nand/denali.c

/*
 * NAND Flash Controller Device Driver
 * Copyright © 2009-2010, Intel Corporation and its suppliers.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/wait.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/module.h>

#include "denali.h"

MODULE_LICENSE("GPL");

/*
 * We define a module parameter that allows the user to override
 * the hardware and decide what timing mode should be used.
 */

#define NAND_DEFAULT_TIMINGS	-1


static int onfi_timing_mode = NAND_DEFAULT_TIMINGS;
module_param(onfi_timing_mode, int, S_IRUGO);
MODULE_PARM_DESC(onfi_timing_mode,
	   "Overrides default ONFI setting. -1 indicates use default timings");


#define DENALI_NAND_NAME    "denali-nand"

/*
 * We define a macro here that combines all interrupts this driver uses into
 * a single constant value, for convenience.
 */

#define DENALI_IRQ_ALL	(INTR_STATUS__DMA_CMD_COMP | \
                        INTR_STATUS__ECC_TRANSACTION_DONE | \
                        INTR_STATUS__ECC_ERR | \
                        INTR_STATUS__PROGRAM_FAIL | \
                        INTR_STATUS__LOAD_COMP | \
                        INTR_STATUS__PROGRAM_COMP | \
                        INTR_STATUS__TIME_OUT | \
                        INTR_STATUS__ERASE_FAIL | \
                        INTR_STATUS__RST_COMP | \
                        INTR_STATUS__ERASE_COMP)

/*
 * indicates whether or not the internal value for the flash bank is
 * valid or not
 */

#define CHIP_SELECT_INVALID	-1


#define SUPPORT_8BITECC		1

/*
 * This macro divides two integers and rounds fractional values up
 * to the nearest integer value.
 */

#define CEIL_DIV(X, Y) (((X)%(Y)) ? ((X)/(Y)+1) : ((X)/(Y)))

/*
 * this macro allows us to convert from an MTD structure to our own
 * device context (denali) structure.
 */


static inline struct denali_nand_info *mtd_to_denali(struct mtd_info *mtd)
{
	return container_of(mtd_to_nand(mtd), struct denali_nand_info, nand);
}

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/*
 * These constants are defined by the driver to enable common driver
 * configuration options.
 */

#define SPARE_ACCESS		0x41

#define MAIN_ACCESS		0x42

#define MAIN_SPARE_ACCESS	0x43

#define PIPELINE_ACCESS		0x2000


#define DENALI_READ	0

#define DENALI_WRITE	0x100

/* types of device accesses. We can issue commands and get status */

#define COMMAND_CYCLE	0

#define ADDR_CYCLE	1

#define STATUS_CYCLE	2

/*
 * this is a helper macro that allows us to
 * format the bank into the proper bits for the controller
 */

#define BANK(x) ((x) << 24)

/* forward declarations */
static void clear_interrupts(struct denali_nand_info *denali);
static uint32_t wait_for_irq(struct denali_nand_info *denali,
							uint32_t irq_mask);
static void denali_irq_enable(struct denali_nand_info *denali,
							uint32_t int_mask);
static uint32_t read_interrupt_status(struct denali_nand_info *denali);

/*
 * Certain operations for the denali NAND controller use an indexed mode to
 * read/write data. The operation is performed by writing the address value
 * of the command to the device memory followed by the data. This function
 * abstracts this common operation.
 */


static void index_addr(struct denali_nand_info *denali,
				uint32_t address, uint32_t data)
{
	iowrite32(address, denali->flash_mem);
	iowrite32(data, denali->flash_mem + 0x10);
}

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/* Perform an indexed read of the device */


static void index_addr_read_data(struct denali_nand_info *denali,
				 uint32_t address, uint32_t *pdata)
{
	iowrite32(address, denali->flash_mem);
	*pdata = ioread32(denali->flash_mem + 0x10);
}

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/*
 * We need to buffer some data for some of the NAND core routines.
 * The operations manage buffering that data.
 */


static void reset_buf(struct denali_nand_info *denali)
{
	denali->buf.head = denali->buf.tail = 0;
}

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static void write_byte_to_buf(struct denali_nand_info *denali, uint8_t byte)
{
	denali->buf.buf[denali->buf.tail++] = byte;
}

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/* reads the status of the device */


static void read_status(struct denali_nand_info *denali)
{
	uint32_t cmd;

	/* initialize the data buffer to store status */
	reset_buf(denali);

	cmd = ioread32(denali->flash_reg + WRITE_PROTECT);
	if (cmd)
		write_byte_to_buf(denali, NAND_STATUS_WP);
	else
		write_byte_to_buf(denali, 0);
}

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/* resets a specific device connected to the core */


static void reset_bank(struct denali_nand_info *denali)
{
	uint32_t irq_status;
	uint32_t irq_mask = INTR_STATUS__RST_COMP | INTR_STATUS__TIME_OUT;

	clear_interrupts(denali);

	iowrite32(1 << denali->flash_bank, denali->flash_reg + DEVICE_RESET);

	irq_status = wait_for_irq(denali, irq_mask);

	if (irq_status & INTR_STATUS__TIME_OUT)
		dev_err(denali->dev, "reset bank failed.\n");
}

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/* Reset the flash controller */


static uint16_t denali_nand_reset(struct denali_nand_info *denali)
{
	int i;

	dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
		__FILE__, __LINE__, __func__);

	for (i = 0; i < denali->max_banks; i++)
		iowrite32(INTR_STATUS__RST_COMP | INTR_STATUS__TIME_OUT,
		denali->flash_reg + INTR_STATUS(i));

	for (i = 0; i < denali->max_banks; i++) {
		iowrite32(1 << i, denali->flash_reg + DEVICE_RESET);
		while (!(ioread32(denali->flash_reg + INTR_STATUS(i)) &
			(INTR_STATUS__RST_COMP | INTR_STATUS__TIME_OUT)))
			cpu_relax();
		if (ioread32(denali->flash_reg + INTR_STATUS(i)) &
			INTR_STATUS__TIME_OUT)
			dev_dbg(denali->dev,
			"NAND Reset operation timed out on bank %d\n", i);
	}

	for (i = 0; i < denali->max_banks; i++)
		iowrite32(INTR_STATUS__RST_COMP | INTR_STATUS__TIME_OUT,
			  denali->flash_reg + INTR_STATUS(i));

	return PASS;
}

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/*
 * this routine calculates the ONFI timing values for a given mode and
 * programs the clocking register accordingly. The mode is determined by
 * the get_onfi_nand_para routine.
 */


static void nand_onfi_timing_set(struct denali_nand_info *denali,
								uint16_t mode)
{
	uint16_t Trea[6] = {40, 30, 25, 20, 20, 16};
	uint16_t Trp[6] = {50, 25, 17, 15, 12, 10};
	uint16_t Treh[6] = {30, 15, 15, 10, 10, 7};
	uint16_t Trc[6] = {100, 50, 35, 30, 25, 20};
	uint16_t Trhoh[6] = {0, 15, 15, 15, 15, 15};
	uint16_t Trloh[6] = {0, 0, 0, 0, 5, 5};
	uint16_t Tcea[6] = {100, 45, 30, 25, 25, 25};
	uint16_t Tadl[6] = {200, 100, 100, 100, 70, 70};
	uint16_t Trhw[6] = {200, 100, 100, 100, 100, 100};
	uint16_t Trhz[6] = {200, 100, 100, 100, 100, 100};
	uint16_t Twhr[6] = {120, 80, 80, 60, 60, 60};
	uint16_t Tcs[6] = {70, 35, 25, 25, 20, 15};

	uint16_t data_invalid_rhoh, data_invalid_rloh, data_invalid;
	uint16_t dv_window = 0;
	uint16_t en_lo, en_hi;
	uint16_t acc_clks;
	uint16_t addr_2_data, re_2_we, re_2_re, we_2_re, cs_cnt;

	dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
		__FILE__, __LINE__, __func__);

	en_lo = CEIL_DIV(Trp[mode], CLK_X);
	en_hi = CEIL_DIV(Treh[mode], CLK_X);
#if ONFI_BLOOM_TIME
	if ((en_hi * CLK_X) < (Treh[mode] + 2))
		en_hi++;
#endif

	if ((en_lo + en_hi) * CLK_X < Trc[mode])
		en_lo += CEIL_DIV((Trc[mode] - (en_lo + en_hi) * CLK_X), CLK_X);

	if ((en_lo + en_hi) < CLK_MULTI)
		en_lo += CLK_MULTI - en_lo - en_hi;

	while (dv_window < 8) {
		data_invalid_rhoh = en_lo * CLK_X + Trhoh[mode];

		data_invalid_rloh = (en_lo + en_hi) * CLK_X + Trloh[mode];

		data_invalid = data_invalid_rhoh < data_invalid_rloh ?
					data_invalid_rhoh : data_invalid_rloh;

		dv_window = data_invalid - Trea[mode];

		if (dv_window < 8)
			en_lo++;
	}

	acc_clks = CEIL_DIV(Trea[mode], CLK_X);

	while (acc_clks * CLK_X - Trea[mode] < 3)
		acc_clks++;

	if (data_invalid - acc_clks * CLK_X < 2)
		dev_warn(denali->dev, "%s, Line %d: Warning!\n",
			 __FILE__, __LINE__);

	addr_2_data = CEIL_DIV(Tadl[mode], CLK_X);
	re_2_we = CEIL_DIV(Trhw[mode], CLK_X);
	re_2_re = CEIL_DIV(Trhz[mode], CLK_X);
	we_2_re = CEIL_DIV(Twhr[mode], CLK_X);
	cs_cnt = CEIL_DIV((Tcs[mode] - Trp[mode]), CLK_X);
	if (cs_cnt == 0)
		cs_cnt = 1;

	if (Tcea[mode]) {
		while (cs_cnt * CLK_X + Trea[mode] < Tcea[mode])
			cs_cnt++;
	}

#if MODE5_WORKAROUND
	if (mode == 5)
		acc_clks = 5;
#endif

	/* Sighting 3462430: Temporary hack for MT29F128G08CJABAWP:B */
	if (ioread32(denali->flash_reg + MANUFACTURER_ID) == 0 &&
		ioread32(denali->flash_reg + DEVICE_ID) == 0x88)
		acc_clks = 6;

	iowrite32(acc_clks, denali->flash_reg + ACC_CLKS);
	iowrite32(re_2_we, denali->flash_reg + RE_2_WE);
	iowrite32(re_2_re, denali->flash_reg + RE_2_RE);
	iowrite32(we_2_re, denali->flash_reg + WE_2_RE);
	iowrite32(addr_2_data, denali->flash_reg + ADDR_2_DATA);
	iowrite32(en_lo, denali->flash_reg + RDWR_EN_LO_CNT);
	iowrite32(en_hi, denali->flash_reg + RDWR_EN_HI_CNT);
	iowrite32(cs_cnt, denali->flash_reg + CS_SETUP_CNT);
}

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/* queries the NAND device to see what ONFI modes it supports. */


static uint16_t get_onfi_nand_para(struct denali_nand_info *denali)
{
	int i;

	/*
         * we needn't to do a reset here because driver has already
         * reset all the banks before
         */
	if (!(ioread32(denali->flash_reg + ONFI_TIMING_MODE) &
		ONFI_TIMING_MODE__VALUE))
		return FAIL;

	for (i = 5; i > 0; i--) {
		if (ioread32(denali->flash_reg + ONFI_TIMING_MODE) &
			(0x01 << i))
			break;
	}

	nand_onfi_timing_set(denali, i);

	/*
         * By now, all the ONFI devices we know support the page cache
         * rw feature. So here we enable the pipeline_rw_ahead feature
         */
	/* iowrite32(1, denali->flash_reg + CACHE_WRITE_ENABLE); */
	/* iowrite32(1, denali->flash_reg + CACHE_READ_ENABLE);  */

	return PASS;
}

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static void get_samsung_nand_para(struct denali_nand_info *denali,
							uint8_t device_id)
{
	if (device_id == 0xd3) { /* Samsung K9WAG08U1A */
		/* Set timing register values according to datasheet */
		iowrite32(5, denali->flash_reg + ACC_CLKS);
		iowrite32(20, denali->flash_reg + RE_2_WE);
		iowrite32(12, denali->flash_reg + WE_2_RE);
		iowrite32(14, denali->flash_reg + ADDR_2_DATA);
		iowrite32(3, denali->flash_reg + RDWR_EN_LO_CNT);
		iowrite32(2, denali->flash_reg + RDWR_EN_HI_CNT);
		iowrite32(2, denali->flash_reg + CS_SETUP_CNT);
	}
}

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static void get_toshiba_nand_para(struct denali_nand_info *denali)
{
	uint32_t tmp;

	/*
         * Workaround to fix a controller bug which reports a wrong
         * spare area size for some kind of Toshiba NAND device
         */
	if ((ioread32(denali->flash_reg + DEVICE_MAIN_AREA_SIZE) == 4096) &&
		(ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE) == 64)) {
		iowrite32(216, denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
		tmp = ioread32(denali->flash_reg + DEVICES_CONNECTED) *
			ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
		iowrite32(tmp,
				denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE);
#if SUPPORT_15BITECC
		iowrite32(15, denali->flash_reg + ECC_CORRECTION);
#elif SUPPORT_8BITECC
		iowrite32(8, denali->flash_reg + ECC_CORRECTION);
#endif
	}
}

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static void get_hynix_nand_para(struct denali_nand_info *denali,
							uint8_t device_id)
{
	uint32_t main_size, spare_size;

	switch (device_id) {
	case 0xD5: /* Hynix H27UAG8T2A, H27UBG8U5A or H27UCG8VFA */
	case 0xD7: /* Hynix H27UDG8VEM, H27UCG8UDM or H27UCG8V5A */
		iowrite32(128, denali->flash_reg + PAGES_PER_BLOCK);
		iowrite32(4096, denali->flash_reg + DEVICE_MAIN_AREA_SIZE);
		iowrite32(224, denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
		main_size = 4096 *
			ioread32(denali->flash_reg + DEVICES_CONNECTED);
		spare_size = 224 *
			ioread32(denali->flash_reg + DEVICES_CONNECTED);
		iowrite32(main_size,
				denali->flash_reg + LOGICAL_PAGE_DATA_SIZE);
		iowrite32(spare_size,
				denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE);
		iowrite32(0, denali->flash_reg + DEVICE_WIDTH);
#if SUPPORT_15BITECC
		iowrite32(15, denali->flash_reg + ECC_CORRECTION);
#elif SUPPORT_8BITECC
		iowrite32(8, denali->flash_reg + ECC_CORRECTION);
#endif
		break;
	default:
		dev_warn(denali->dev,
			 "Spectra: Unknown Hynix NAND (Device ID: 0x%x).\n"
			 "Will use default parameter values instead.\n",
			 device_id);
	}
}

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/*
 * determines how many NAND chips are connected to the controller. Note for
 * Intel CE4100 devices we don't support more than one device.
 */


static void find_valid_banks(struct denali_nand_info *denali)
{
	uint32_t id[denali->max_banks];
	int i;

	denali->total_used_banks = 1;
	for (i = 0; i < denali->max_banks; i++) {
		index_addr(denali, MODE_11 | (i << 24) | 0, 0x90);
		index_addr(denali, MODE_11 | (i << 24) | 1, 0);
		index_addr_read_data(denali, MODE_11 | (i << 24) | 2, &id[i]);

		dev_dbg(denali->dev,
			"Return 1st ID for bank[%d]: %x\n", i, id[i]);

		if (i == 0) {
			if (!(id[i] & 0x0ff))
				break; /* WTF? */
		} else {
			if ((id[i] & 0x0ff) == (id[0] & 0x0ff))
				denali->total_used_banks++;
			else
				break;
		}
	}

	if (denali->platform == INTEL_CE4100) {
		/*
                 * Platform limitations of the CE4100 device limit
                 * users to a single chip solution for NAND.
                 * Multichip support is not enabled.
                 */
		if (denali->total_used_banks != 1) {
			dev_err(denali->dev,
				"Sorry, Intel CE4100 only supports a single NAND device.\n");
			BUG();
		}
	}
	dev_dbg(denali->dev,
		"denali->total_used_banks: %d\n", denali->total_used_banks);
}

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/*
 * Use the configuration feature register to determine the maximum number of
 * banks that the hardware supports.
 */


static void detect_max_banks(struct denali_nand_info *denali)
{
	uint32_t features = ioread32(denali->flash_reg + FEATURES);
	/*
         * Read the revision register, so we can calculate the max_banks
         * properly: the encoding changed from rev 5.0 to 5.1
         */
	u32 revision = MAKE_COMPARABLE_REVISION(
				ioread32(denali->flash_reg + REVISION));

	if (revision < REVISION_5_1)
		denali->max_banks = 2 << (features & FEATURES__N_BANKS);
	else
		denali->max_banks = 1 << (features & FEATURES__N_BANKS);
}

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static void detect_partition_feature(struct denali_nand_info *denali)
{
	/*
         * For MRST platform, denali->fwblks represent the
         * number of blocks firmware is taken,
         * FW is in protect partition and MTD driver has no
         * permission to access it. So let driver know how many
         * blocks it can't touch.
         */
	if (ioread32(denali->flash_reg + FEATURES) & FEATURES__PARTITION) {
		if ((ioread32(denali->flash_reg + PERM_SRC_ID(1)) &
			PERM_SRC_ID__SRCID) == SPECTRA_PARTITION_ID) {
			denali->fwblks =
			    ((ioread32(denali->flash_reg + MIN_MAX_BANK(1)) &
			      MIN_MAX_BANK__MIN_VALUE) *
			     denali->blksperchip)
			    +
			    (ioread32(denali->flash_reg + MIN_BLK_ADDR(1)) &
			    MIN_BLK_ADDR__VALUE);
		} else {
			denali->fwblks = SPECTRA_START_BLOCK;
		}
	} else {
		denali->fwblks = SPECTRA_START_BLOCK;
	}
}

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jason roberts
jason roberts
78
71.56%
1
20.00%
jamie iles
jamie iles
15
13.76%
1
20.00%
chuanxiao dong
chuanxiao dong
11
10.09%
1
20.00%
masahiro yamada
masahiro yamada
5
4.59%
2
40.00%
Total
109
100.00%
5
100.00%



static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
{
	uint16_t status = PASS;
	uint32_t id_bytes[8], addr;
	uint8_t maf_id, device_id;
	int i;

	dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
			__FILE__, __LINE__, __func__);

	/*
         * Use read id method to get device ID and other params.
         * For some NAND chips, controller can't report the correct
         * device ID by reading from DEVICE_ID register
         */
	addr = MODE_11 | BANK(denali->flash_bank);
	index_addr(denali, addr | 0, 0x90);
	index_addr(denali, addr | 1, 0);
	for (i = 0; i < 8; i++)
		index_addr_read_data(denali, addr | 2, &id_bytes[i]);
	maf_id = id_bytes[0];
	device_id = id_bytes[1];

	if (ioread32(denali->flash_reg + ONFI_DEVICE_NO_OF_LUNS) &
		ONFI_DEVICE_NO_OF_LUNS__ONFI_DEVICE) { /* ONFI 1.0 NAND */
		if (FAIL == get_onfi_nand_para(denali))
			return FAIL;
	} else if (maf_id == 0xEC) { /* Samsung NAND */
		get_samsung_nand_para(denali, device_id);
	} else if (maf_id == 0x98) { /* Toshiba NAND */
		get_toshiba_nand_para(denali);
	} else if (maf_id == 0xAD) { /* Hynix NAND */
		get_hynix_nand_para(denali, device_id);
	}

	dev_info(denali->dev,
			"Dump timing register values:\n"
			"acc_clks: %d, re_2_we: %d, re_2_re: %d\n"
			"we_2_re: %d, addr_2_data: %d, rdwr_en_lo_cnt: %d\n"
			"rdwr_en_hi_cnt: %d, cs_setup_cnt: %d\n",
			ioread32(denali->flash_reg + ACC_CLKS),
			ioread32(denali->flash_reg + RE_2_WE),
			ioread32(denali->flash_reg + RE_2_RE),
			ioread32(denali->flash_reg + WE_2_RE),
			ioread32(denali->flash_reg + ADDR_2_DATA),
			ioread32(denali->flash_reg + RDWR_EN_LO_CNT),
			ioread32(denali->flash_reg + RDWR_EN_HI_CNT),
			ioread32(denali->flash_reg + CS_SETUP_CNT));

	find_valid_banks(denali);

	detect_partition_feature(denali);

	/*
         * If the user specified to override the default timings
         * with a specific ONFI mode, we apply those changes here.
         */
	if (onfi_timing_mode != NAND_DEFAULT_TIMINGS)
		nand_onfi_timing_set(denali, onfi_timing_mode);

	return status;
}

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jason roberts
jason roberts
212
68.17%
1
10.00%
chuanxiao dong
chuanxiao dong
91
29.26%
5
50.00%
masahiro yamada
masahiro yamada
6
1.93%
3
30.00%
graham moore
graham moore
2
0.64%
1
10.00%
Total
311
100.00%
10
100.00%



static void denali_set_intr_modes(struct denali_nand_info *denali,
					uint16_t INT_ENABLE)
{
	dev_dbg(denali->dev, "%s, Line %d, Function: %s\n",
		__FILE__, __LINE__, __func__);

	if (INT_ENABLE)
		iowrite32(1, denali->flash_reg + GLOBAL_INT_ENABLE);
	else
		iowrite32(0, denali->flash_reg + GLOBAL_INT_ENABLE);
}

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jason roberts
jason roberts
49
87.50%
1
25.00%
chuanxiao dong
chuanxiao dong
7
12.50%
3
75.00%
Total
56
100.00%
4
100.00%

/*
 * validation function to verify that the controlling software is making
 * a valid request
 */


static inline bool is_flash_bank_valid(int flash_bank)
{
	return flash_bank >= 0 && flash_bank < 4;
}

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jason roberts
jason roberts
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%



static void denali_irq_init(struct denali_nand_info *denali)
{
	uint32_t int_mask;
	int i;

	/* Disable global interrupts */
	denali_set_intr_modes(denali, false);

	int_mask = DENALI_IRQ_ALL;

	/* Clear all status bits */
	for (i = 0; i < denali->max_banks; ++i)
		iowrite32(0xFFFF, denali->flash_reg + INTR_STATUS(i));

	denali_irq_enable(denali, int_mask);
}

Contributors
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jason roberts
jason roberts
44
66.67%
1
20.00%
jamie iles
jamie iles
20
30.30%
2
40.00%
chuanxiao dong
chuanxiao dong
2
3.03%
2
40.00%
Total
66
100.00%
5
100.00%



static void denali_irq_cleanup(int irqnum, struct denali_nand_info *denali)
{
	denali_set_intr_modes(denali, false);
	free_irq(irqnum, denali);
}

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jason roberts
jason roberts
27
96.43%
1
50.00%
chuanxiao dong
chuanxiao dong
1
3.57%
1
50.00%
Total
28
100.00%
2
100.00%



static void denali_irq_enable(struct denali_nand_info *denali,
							uint32_t int_mask)
{
	int i;

	for (i = 0; i < denali->max_banks; ++i)
		iowrite32(int_mask, denali->flash_reg + INTR_EN(i));
}

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jason roberts
jason roberts
25
54.35%
1
25.00%
jamie iles
jamie iles
20
43.48%
2
50.00%
chuanxiao dong
chuanxiao dong
1
2.17%
1
25.00%
Total
46
100.00%
4
100.00%

/*
 * This function only returns when an interrupt that this driver cares about
 * occurs. This is to reduce the overhead of servicing interrupts
 */


static inline uint32_t denali_irq_detected(struct denali_nand_info *denali)
{
	return read_interrupt_status(denali) & DENALI_IRQ_ALL;
}

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jason roberts
20
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1
100.00%
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20
100.00%
1
100.00%

/* Interrupts are cleared by writing a 1 to the appropriate status bit */


static inline void clear_interrupt(struct denali_nand_info *denali,
							uint32_t irq_mask)
{
	uint32_t intr_status_reg;

	intr_status_reg = INTR_STATUS(denali->flash_bank);

	iowrite32(irq_mask, denali->flash_reg + intr_status_reg);
}

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jason roberts
jason roberts
34
89.47%
1
33.33%
jamie iles
jamie iles
3
7.89%
1
33.33%
chuanxiao dong
chuanxiao dong
1
2.63%
1
33.33%
Total
38
100.00%
3
100.00%



static void clear_interrupts(struct denali_nand_info *denali)
{
	uint32_t status;

	spin_lock_irq(&denali->irq_lock);

	status = read_interrupt_status(denali);
	clear_interrupt(denali, status);

	denali->irq_status = 0x0;
	spin_unlock_irq(&denali->irq_lock);
}

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jason roberts
jason roberts
43
86.00%
1
50.00%
chuanxiao dong
chuanxiao dong
7
14.00%
1
50.00%
Total
50
100.00%
2
100.00%



static uint32_t read_interrupt_status(struct denali_nand_info *denali)
{
	uint32_t intr_status_reg;

	intr_status_reg = INTR_STATUS(denali->flash_bank);

	return ioread32(denali->flash_reg + intr_status_reg);
}

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jason roberts
jason roberts
30
90.91%
1
50.00%
jamie iles
jamie iles
3
9.09%
1
50.00%
Total
33
100.00%
2
100.00%

/*
 * This is the interrupt service routine. It handles all interrupts
 * sent to this device. Note that on CE4100, this is a shared interrupt.
 */


static irqreturn_t denali_isr(int irq, void *dev_id)
{
	struct denali_nand_info *denali = dev_id;
	uint32_t irq_status;
	irqreturn_t result = IRQ_NONE;

	spin_lock(&denali->irq_lock);

	/* check to see if a valid NAND chip has been selected. */
	if (is_flash_bank_valid(denali->flash_bank)) {
		/*
                 * check to see if controller generated the interrupt,
                 * since this is a shared interrupt
                 */
		irq_status = denali_irq_detected(denali);
		if (irq_status != 0) {
			/* handle interrupt */
			/* first acknowledge it */
			clear_interrupt(denali, irq_status);
			/*
                         * store the status in the device context for someone
                         * to read
                         */
			denali->irq_status |= irq_status;
			/* notify anyone who cares that it happened */
			complete(&denali->complete);
			/* tell the OS that we've handled this */
			result = IRQ_HANDLED;
		}
	}
	spin_unlock(&denali->irq_lock);
	return result;
}
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jason roberts
jason roberts
98
93.33%
1
33.33%
chuanxiao dong
chuanxiao dong
4
3.81%
1
33.33%
masahiro yamada
masahiro yamada
3
2.86%
1
33.33%
Total
105
100.00%
3
100.00%


#define BANK(x) ((x) << 24)



static uint32_t wait_for_irq(struct denali_nand_info *denali, uint32_t irq_mask)
{
	unsigned long comp_res;
	uint32_t intr_status;
	unsigned long timeout = msecs_to_jiffies(1000);

	do {
		comp_res =
			wait_for_completion_timeout(&denali->complete, timeout);
		spin_lock_irq(&denali->irq_lock);
		intr_status = denali->irq_status;

		if (intr_status & irq_mask) {
			denali->irq_status &= ~irq_mask;
			spin_unlock_irq(&denali->irq_lock);
			/* our interrupt was detected */
			break;
		}

		/*
                 * these are not the interrupts you are looking for -
                 * need to wait again
                 */
		spin_unlock_irq(&denali->irq_lock);
	} while (comp_res != 0);

	if (comp_res == 0) {
		/* timeout */
		pr_err("timeout occurred, status = 0x%x, mask = 0x%x\n",
				intr_status, irq_mask);

		intr_status = 0;
	}
	return intr_status;
}

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jason roberts
jason roberts
123
98.40%
1
33.33%
masahiro yamada
masahiro yamada
1
0.80%
1
33.33%
dinh nguyen
dinh nguyen
1
0.80%
1
33.33%
Total
125
100.00%
3
100.00%

/*
 * This helper function setups the registers for ECC and whether or not
 * the spare area will be transferred.
 */


static void setup_ecc_for_xfer(struct denali_nand_info *denali, bool ecc_en,
				bool transfer_spare)
{
	int ecc_en_flag, transfer_spare_flag;

	/* set ECC, transfer spare bits if needed */
	ecc_en_flag = ecc_en ? ECC_ENABLE__FLAG : 0;
	transfer_spare_flag = transfer_spare ? TRANSFER_SPARE_REG__FLAG : 0;

	/* Enable spare area/ECC per user's request. */
	iowrite32(ecc_en_flag, denali->flash_reg + ECC_ENABLE);
	iowrite32(transfer_spare_flag, denali->flash_reg + TRANSFER_SPARE_REG);
}

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jason roberts
jason roberts
60
96.77%
1
50.00%
chuanxiao dong
chuanxiao dong
2
3.23%
1
50.00%
Total
62
100.00%
2
100.00%

/*
 * sends a pipeline command operation to the controller. See the Denali NAND
 * controller's user guide for more information (section 4.2.3.6).
 */


static int denali_send_pipeline_cmd(struct denali_nand_info *denali,
				    bool ecc_en, bool transfer_spare,
				    int access_type, int op)
{
	int status = PASS;
	uint32_t page_count = 1;
	uint32_t addr, cmd, irq_status, irq_mask;

	if (op == DENALI_READ)
		irq_mask = INTR_STATUS__LOAD_COMP;
	else if (op == DENALI_WRITE)
		irq_mask = 0;
	else
		BUG();

	setup_ecc_for_xfer(denali, ecc_en, transfer_spare);

	clear_interrupts(denali);

	addr = BANK(denali->flash_bank) | denali->page;

	if (op == DENALI_WRITE && access_type != SPARE_ACCESS) {
		cmd = MODE_01 | addr;
		iowrite32(cmd, denali->flash_mem);
	} else if (op == DENALI_WRITE && access_type == SPARE_ACCESS) {
		/* read spare area */
		cmd = MODE_10 | addr;
		index_addr(denali, cmd, access_type);

		cmd = MODE_01 | addr;
		iowrite32(cmd, denali->flash_mem);
	} else if (op == DENALI_READ) {
		/* setup page read request for access type */
		cmd = MODE_10 | addr;
		index_addr(denali, cmd, access_type);

		/*
                 * page 33 of the NAND controller spec indicates we should not
                 * use the pipeline commands in Spare area only mode.
                 * So we don't.
                 */
		if (access_type == SPARE_ACCESS) {
			cmd = MODE_01 | addr;
			iowrite32(cmd, denali->flash_mem);
		} else {
			index_addr(denali, cmd,
					PIPELINE_ACCESS | op | page_count);

			/*
                         * wait for command to be accepted
                         * can always use status0 bit as the
                         * mask is identical for each bank.
                         */
			irq_status = wait_for_irq(denali, irq_mask);

			if (irq_status == 0) {
				dev_err(denali->dev,
					"cmd, page, addr on timeout (0x%x, 0x%x, 0x%x)\n",
					cmd, denali->page, addr);
				status = FAIL;
			} else {
				cmd = MODE_01 | addr;
				iowrite32(cmd, denali->flash_mem);
			}
		}
	}
	return status;
}

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jason roberts
jason roberts
271
93.45%
1
12.50%
chuanxiao dong
chuanxiao dong
9
3.10%
2
25.00%
masahiro yamada
masahiro yamada
9
3.10%
4
50.00%
jamie iles
jamie iles
1
0.34%
1
12.50%
Total
290
100.00%
8
100.00%

/* helper function that simply writes a buffer to the flash */


static int write_data_to_flash_mem(struct denali_nand_info *denali,
				   const uint8_t *buf, int len)
{
	uint32_t *buf32;
	int i;

	/*
         * verify that the len is a multiple of 4.
         * see comment in read_data_from_flash_mem()
         */
	BUG_ON((len % 4) != 0);

	/* write the data to the flash memory */
	buf32 = (uint32_t *)buf;
	for (i = 0; i < len / 4; i++)
		iowrite32(*buf32++, denali->flash_mem + 0x10);
	return i * 4; /* intent is to return the number of bytes read */
}

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jason roberts
jason roberts
76
93.83%
1
25.00%
masahiro yamada
masahiro yamada
4
4.94%
2
50.00%
chuanxiao dong
chuanxiao dong
1
1.23%
1
25.00%
Total
81
100.00%
4
100.00%

/* helper function that simply reads a buffer from the flash */


static int read_data_from_flash_mem(struct denali_nand_info *denali,
				    uint8_t *buf, int len)
{
	uint32_t *buf32;
	int i;

	/*
         * we assume that len will be a multiple of 4, if not it would be nice
         * to know about it ASAP rather than have random failures...
         * This assumption is based on the fact that this function is designed
         * to be used to read flash pages, which are typically multiples of 4.
         */
	BUG_ON((len % 4) != 0);

	/* transfer the data from the flash */
	buf32 = (uint32_t *)buf;
	for (i = 0; i < len / 4; i++)
		*buf32++ = ioread32(denali->flash_mem + 0x10);
	return i * 4; /* intent is to return the number of bytes read */
}

Contributors
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jason roberts
jason roberts
76
95.00%
1
33.33%
masahiro yamada
masahiro yamada
4
5.00%
2
66.67%
Total
80
100.00%
3
100.00%

/* writes OOB data to the device */


static int write_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);
	uint32_t irq_status;
	uint32_t irq_mask = INTR_STATUS__PROGRAM_COMP |
						INTR_STATUS__PROGRAM_FAIL;
	int status = 0;

	denali->page = page;

	if (denali_send_pipeline_cmd(denali, false, false, SPARE_ACCESS,
							DENALI_WRITE) == PASS) {
		write_data_to_flash_mem(denali, buf, mtd->oobsize);

		/* wait for operation to complete */
		irq_status = wait_for_irq(denali, irq_mask);

		if (irq_status == 0) {
			dev_err(denali->dev, "OOB write failed\n");
			status = -EIO;
		}
	} else {
		dev_err(denali->dev, "unable to send pipeline command\n");
		status = -EIO;
	}
	return status;
}

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jason roberts
jason roberts
119
90.84%
1
33.33%
chuanxiao dong
chuanxiao dong
10
7.63%
1
33.33%
jamie iles
jamie iles
2
1.53%
1
33.33%
Total
131
100.00%
3
100.00%

/* reads OOB data from the device */


static void read_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);
	uint32_t irq_mask = INTR_STATUS__LOAD_COMP;
	uint32_t irq_status, addr, cmd;

	denali->page = page;

	if (denali_send_pipeline_cmd(denali, false, true, SPARE_ACCESS,
							DENALI_READ) == PASS) {
		read_data_from_flash_mem(denali, buf, mtd->oobsize);

		/*
                 * wait for command to be accepted
                 * can always use status0 bit as the
                 * mask is identical for each bank.
                 */
		irq_status = wait_for_irq(denali, irq_mask);

		if (irq_status == 0)
			dev_err(denali->dev, "page on OOB timeout %d\n",
					denali->page);

		/*
                 * We set the device back to MAIN_ACCESS here as I observed
                 * instability with the controller if you do a block erase
                 * and the last transaction was a SPARE_ACCESS. Block erase
                 * is reliable (according to the MTD test infrastructure)
                 * if you are in MAIN_ACCESS.
                 */
		addr = BANK(denali->flash_bank) | denali->page;
		cmd = MODE_10 | addr;
		index_addr(denali, cmd, MAIN_ACCESS);
	}
}

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jason roberts
jason roberts
124
92.54%
1
20.00%
chuanxiao dong
chuanxiao dong
5
3.73%
1
20.00%
masahiro yamada
masahiro yamada
4
2.99%
2
40.00%
jamie iles
jamie iles
1
0.75%
1
20.00%
Total
134
100.00%
5
100.00%

/*
 * this function examines buffers to see if they contain data that
 * indicate that the buffer is part of an erased region of flash.
 */


static bool is_erased(uint8_t *buf, int len)
{
	int i;

	for (i = 0; i < len; i++)
		if (buf[i] != 0xFF)
			return false;
	return true;
}
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jason roberts
jason roberts
43
97.73%
1
50.00%
rashika kheria
rashika kheria
1
2.27%
1
50.00%
Total
44
100.00%
2
100.00%


#define ECC_SECTOR_SIZE 512


#define ECC_SECTOR(x)	(((x) & ECC_ERROR_ADDRESS__SECTOR_NR) >> 12)

#define ECC_BYTE(x)	(((x) & ECC_ERROR_ADDRESS__OFFSET))

#define ECC_CORRECTION_VALUE(x) ((x) & ERR_CORRECTION_INFO__BYTEMASK)

#define ECC_ERROR_CORRECTABLE(x) (!((x) & ERR_CORRECTION_INFO__ERROR_TYPE))

#define ECC_ERR_DEVICE(x)	(((x) & ERR_CORRECTION_INFO__DEVICE_NR) >> 8)

#define ECC_LAST_ERR(x)		((x) & ERR_CORRECTION_INFO__LAST_ERR_INFO)



static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf,
		       uint32_t irq_status, unsigned int *max_bitflips)
{
	bool check_erased_page = false;
	unsigned int bitflips = 0;

	if (irq_status & INTR_STATUS__ECC_ERR) {
		/* read the ECC errors. we'll ignore them for now */
		uint32_t err_address, err_correction_info, err_byte,
			 err_sector, err_device, err_correction_value;
		denali_set_intr_modes(denali, false);

		do {
			err_address = ioread32(denali->flash_reg +
						ECC_ERROR_ADDRESS);
			err_sector = ECC_SECTOR(err_address);
			err_byte = ECC_BYTE(err_address);

			err_correction_info = ioread32(denali->flash_reg +
						ERR_CORRECTION_INFO);
			err_correction_value =
				ECC_CORRECTION_VALUE(err_correction_info);
			err_device = ECC_ERR_DEVICE(err_correction_info);

			if (ECC_ERROR_CORRECTABLE(err_correction_info)) {
				/*
                                 * If err_byte is larger than ECC_SECTOR_SIZE,
                                 * means error happened in OOB, so we ignore
                                 * it. It's no need for us to correct it
                                 * err_device is represented the NAND error
                                 * bits are happened in if there are more
                                 * than one NAND connected.
                                 */
				if (err_byte < ECC_SECTOR_SIZE) {
					struct mtd_info *mtd =
						nand_to_mtd(&denali->nand);
					int offset;

					offset = (err_sector *
							ECC_SECTOR_SIZE +
							err_byte) *
							denali->devnum +
							err_device;
					/* correct the ECC error */
					buf[offset] ^= err_correction_value;
					mtd->ecc_stats.corrected++;
					bitflips++;
				}
			} else {
				/*
                                 * if the error is not correctable, need to
                                 * look at the page to see if it is an erased
                                 * page. if so, then it's not a real ECC error
                                 */
				check_erased_page = true;
			}
		} while (!ECC_LAST_ERR(err_correction_info));
		/*
                 * Once handle all ecc errors, controller will triger
                 * a ECC_TRANSACTION_DONE interrupt, so here just wait
                 * for a while for this interrupt
                 */
		while (!(read_interrupt_status(denali) &
				INTR_STATUS__ECC_TRANSACTION_DONE))
			cpu_relax();
		clear_interrupts(denali);
		denali_set_intr_modes(denali, true);
	}
	*max_bitflips = bitflips;
	return check_erased_page;
}

Contributors
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jason roberts
jason roberts
147
62.03%
1
14.29%
chuanxiao dong
chuanxiao dong
50
21.10%
1
14.29%
mike dunn
mike dunn
19
8.02%
1
14.29%
boris brezillon
boris brezillon
14
5.91%
1
14.29%
masahiro yamada
masahiro yamada
5
2.11%
2
28.57%
jamie iles
jamie iles
2
0.84%
1
14.29%
Total
237
100.00%
7
100.00%

/* programs the controller to either enable/disable DMA transfers */


static void denali_enable_dma(struct denali_nand_info *denali, bool en)
{
	iowrite32(en ? DMA_ENABLE__FLAG : 0, denali->flash_reg + DMA_ENABLE);
	ioread32(denali->flash_reg + DMA_ENABLE);
}

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jason roberts
jason roberts
31
81.58%
1
25.00%
masahiro yamada
masahiro yamada
5
13.16%
1
25.00%
chuanxiao dong
chuanxiao dong
1
2.63%
1
25.00%
david woodhouse
david woodhouse
1
2.63%
1
25.00%
Total
38
100.00%
4
100.00%

/* setups the HW to perform the data DMA */


static void denali_setup_dma(struct denali_nand_info *denali, int op)
{
	uint32_t mode;
	const int page_count = 1;
	uint32_t addr = denali->buf.dma_buf;

	mode = MODE_10 | BANK(denali->flash_bank);

	/* DMA is a four step process */

	/* 1. setup transfer type and # of pages */
	index_addr(denali, mode | denali->page, 0x2000 | op | page_count);

	/* 2. set memory high address bits 23:8 */
	index_addr(denali, mode | ((addr >> 16) << 8), 0x2200);

	/* 3. set memory low address bits 23:8 */
	index_addr(denali, mode | ((addr & 0xffff) << 8), 0x2300);

	/* 4. interrupt when complete, burst len = 64 bytes */
	index_addr(denali, mode | 0x14000, 0x2400);
}

Contributors
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jason roberts
jason roberts
106
92.98%
1
20.00%
masahiro yamada
masahiro yamada
6
5.26%
2
40.00%
graham moore
graham moore
1
0.88%
1
20.00%
david woodhouse
david woodhouse
1
0.88%
1
20.00%
Total
114
100.00%
5
100.00%

/*
 * writes a page. user specifies type, and this function handles the
 * configuration details.
 */


static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
			const uint8_t *buf, bool raw_xfer)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);
	dma_addr_t addr = denali->buf.dma_buf;
	size_t size = mtd->writesize + mtd->oobsize;
	uint32_t irq_status;
	uint32_t irq_mask = INTR_STATUS__DMA_CMD_COMP |
						INTR_STATUS__PROGRAM_FAIL;

	/*
         * if it is a raw xfer, we want to disable ecc and send the spare area.
         * !raw_xfer - enable ecc
         * raw_xfer - transfer spare
         */
	setup_ecc_for_xfer(denali, !raw_xfer, raw_xfer);

	/* copy buffer into DMA buffer */
	memcpy(denali->buf.buf, buf, mtd->writesize);

	if (raw_xfer) {
		/* transfer the data to the spare area */
		memcpy(denali->buf.buf + mtd->writesize,
			chip->oob_poi,
			mtd->oobsize);
	}

	dma_sync_single_for_device(denali->dev, addr, size, DMA_TO_DEVICE);

	clear_interrupts(denali);
	denali_enable_dma(denali, true);

	denali_setup_dma(denali, DENALI_WRITE);

	/* wait for operation to complete */
	irq_status = wait_for_irq(denali, irq_mask);

	if (irq_status == 0) {
		dev_err(denali->dev, "timeout on write_page (type = %d)\n",
			raw_xfer);
		denali->status = NAND_STATUS_FAIL;
	}

	denali_enable_dma(denali, false);
	dma_sync_single_for_cpu(denali->dev, addr, size, DMA_TO_DEVICE);

	return 0;
}

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jason roberts
jason roberts
181
86.60%
1
12.50%
jamie iles
jamie iles
12
5.74%
2
25.00%
chuanxiao dong
chuanxiao dong
6
2.87%
1
12.50%
josh wu
josh wu
4
1.91%
1
12.50%
david woodhouse
david woodhouse
3
1.44%
1
12.50%
boris brezillon
boris brezillon
2
0.96%
1
12.50%
masahiro yamada
masahiro yamada
1
0.48%
1
12.50%
Total
209
100.00%
8
100.00%

/* NAND core entry points */

/*
 * this is the callback that the NAND core calls to write a page. Since
 * writing a page with ECC or without is similar, all the work is done
 * by write_page above.
 */


static int denali_write_page(struct mtd_info *mtd, struct nand_chip *chip,
				const uint8_t *buf, int oob_required, int page)
{
	/*
         * for regular page writes, we let HW handle all the ECC
         * data written to the device.
         */
	return write_page(mtd, chip, buf, false);
}

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jason roberts
jason roberts
30
75.00%
1
20.00%
josh wu
josh wu
3
7.50%
1
20.00%
brian norris
brian norris
3
7.50%
1
20.00%
boris brezillon
boris brezillon
3
7.50%
1
20.00%
masahiro yamada
masahiro yamada
1
2.50%
1
20.00%
Total
40
100.00%
5
100.00%

/*
 * This is the callback that the NAND core calls to write a page without ECC.
 * raw access is similar to ECC page writes, so all the work is done in the
 * write_page() function above.
 */


static int denali_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
				 const uint8_t *buf, int oob_required,
				 int page)
{
	/*
         * for raw page writes, we want to disable ECC and simply write
         * whatever data is in the buffer.
         */
	return write_page(mtd, chip, buf, true);
}

Contributors
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jason roberts
jason roberts
30
75.00%
1
20.00%
josh wu
josh wu
3
7.50%
1
20.00%
boris brezillon
boris brezillon
3
7.50%
1
20.00%
brian norris
brian norris
3
7.50%
1
20.00%
masahiro yamada
masahiro yamada
1
2.50%
1
20.00%
Total
40
100.00%
5
100.00%



static int denali_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
			    int page)
{
	return write_oob_data(mtd, chip->oob_poi, page);
}

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jason roberts
jason roberts
31
100.00%
1
100.00%
Total
31
100.00%
1
100.00%



static int denali_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
			   int page)
{
	read_oob_data(mtd, chip->oob_poi, page);

	return 0;
}

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jason roberts
jason roberts
33
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1
100.00%
Total
33
100.00%
1
100.00%



static int denali_read_page(struct mtd_info *mtd, struct nand_chip *chip,
			    uint8_t *buf, int oob_required, int page)
{
	unsigned int max_bitflips;
	struct denali_nand_info *denali = mtd_to_denali(mtd);

	dma_addr_t addr = denali->buf.dma_buf;
	size_t size = mtd->writesize + mtd->oobsize;

	uint32_t irq_status;
	uint32_t irq_mask = INTR_STATUS__ECC_TRANSACTION_DONE |
			    INTR_STATUS__ECC_ERR;
	bool check_erased_page = false;

	if (page != denali->page) {
		dev_err(denali->dev,
			"IN %s: page %d is not equal to denali->page %d",
			__func__, page, denali->page);
		BUG();
	}

	setup_ecc_for_xfer(denali, true, false);

	denali_enable_dma(denali, true);
	dma_sync_single_for_device(denali->dev, addr, size, DMA_FROM_DEVICE);

	clear_interrupts(denali);
	denali_setup_dma(denali, DENALI_READ);

	/* wait for operation to complete */
	irq_status = wait_for_irq(denali, irq_mask);

	dma_sync_single_for_cpu(denali->dev, addr, size, DMA_FROM_DEVICE);

	memcpy(buf, denali->buf.buf, mtd->writesize);

	check_erased_page = handle_ecc(denali, buf, irq_status, &max_bitflips);
	denali_enable_dma(denali, false);

	if (check_erased_page) {
		read_oob_data(mtd, chip->oob_poi, denali->page);

		/* check ECC failures that may have occurred on erased pages */
		if (check_erased_page) {
			if (!is_erased(buf, mtd->writesize))
				mtd->ecc_stats.failed++;
			if (!is_erased(buf, mtd->oobsize))
				mtd->ecc_stats.failed++;
		}
	}
	return max_bitflips;
}

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jason roberts
jason roberts
210
77.21%
1
11.11%
chuanxiao dong
chuanxiao dong
29
10.66%
1
11.11%
jamie iles
jamie iles
12
4.41%
2
22.22%
mike dunn
mike dunn
8
2.94%
1
11.11%
boris brezillon
boris brezillon
6
2.21%
1
11.11%
brian norris
brian norris
3
1.10%
1
11.11%
david woodhouse
david woodhouse
3
1.10%
1
11.11%
masahiro yamada
masahiro yamada
1
0.37%
1
11.11%
Total
272
100.00%
9
100.00%



static int denali_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
				uint8_t *buf, int oob_required, int page)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);
	dma_addr_t addr = denali->buf.dma_buf;
	size_t size = mtd->writesize + mtd->oobsize;
	uint32_t irq_mask = INTR_STATUS__DMA_CMD_COMP;

	if (page != denali->page) {
		dev_err(denali->dev,
			"IN %s: page %d is not equal to denali->page %d",
			__func__, page, denali->page);
		BUG();
	}

	setup_ecc_for_xfer(denali, false, true);
	denali_enable_dma(denali, true);

	dma_sync_single_for_device(denali->dev, addr, size, DMA_FROM_DEVICE);

	clear_interrupts(denali);
	denali_setup_dma(denali, DENALI_READ);

	/* wait for operation to complete */
	wait_for_irq(denali, irq_mask);

	dma_sync_single_for_cpu(denali->dev, addr, size, DMA_FROM_DEVICE);

	denali_enable_dma(denali, false);

	memcpy(buf, denali->buf.buf, mtd->writesize);
	memcpy(chip->oob_poi, denali->buf.buf + mtd->writesize, mtd->oobsize);

	return 0;
}

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jason roberts
jason roberts
150
75.38%
1
12.50%
chuanxiao dong
chuanxiao dong
29
14.57%
1
12.50%
jamie iles
jamie iles
11
5.53%
2
25.00%
david woodhouse
david woodhouse
3
1.51%
1
12.50%
brian norris
brian norris
3
1.51%
1
12.50%
boris brezillon
boris brezillon
2
1.01%
1
12.50%
masahiro yamada
masahiro yamada
1
0.50%
1
12.50%
Total
199
100.00%
8
100.00%



static uint8_t denali_read_byte(struct mtd_info *mtd)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);
	uint8_t result = 0xff;

	if (denali->buf.head < denali->buf.tail)
		result = denali->buf.buf[denali->buf.head++];

	return result;
}

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jason roberts
jason roberts
59
100.00%
1
100.00%
Total
59
100.00%
1
100.00%



static void denali_select_chip(struct mtd_info *mtd, int chip)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);

	spin_lock_irq(&denali->irq_lock);
	denali->flash_bank = chip;
	spin_unlock_irq(&denali->irq_lock);
}

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jason roberts
jason roberts
46
100.00%
1
100.00%
Total
46
100.00%
1
100.00%



static int denali_waitfunc(struct mtd_info *mtd, struct nand_chip *chip)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);
	int status = denali->status;

	denali->status = 0;

	return status;
}

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jason roberts
jason roberts
42
100.00%
1
100.00%
Total
42
100.00%
1
100.00%



static int denali_erase(struct mtd_info *mtd, int page)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);

	uint32_t cmd, irq_status;

	clear_interrupts(denali);

	/* setup page read request for access type */
	cmd = MODE_10 | BANK(denali->flash_bank) | page;
	index_addr(denali, cmd, 0x1);

	/* wait for erase to complete or failure to occur */
	irq_status = wait_for_irq(denali, INTR_STATUS__ERASE_COMP |
					INTR_STATUS__ERASE_FAIL);

	return irq_status & INTR_STATUS__ERASE_FAIL ? NAND_STATUS_FAIL : PASS;
}

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jason roberts
jason roberts
72
92.31%
1
33.33%
jamie iles
jamie iles
3
3.85%
1
33.33%
brian norris
brian norris
3
3.85%
1
33.33%
Total
78
100.00%
3
100.00%



static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col,
			   int page)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);
	uint32_t addr, id;
	int i;

	switch (cmd) {
	case NAND_CMD_PAGEPROG:
		break;
	case NAND_CMD_STATUS:
		read_status(denali);
		break;
	case NAND_CMD_READID:
	case NAND_CMD_PARAM:
		reset_buf(denali);
		/*
                 * sometimes ManufactureId read from register is not right
                 * e.g. some of Micron MT29F32G08QAA MLC NAND chips
                 * So here we send READID cmd to NAND insteand
                 */
		addr = MODE_11 | BANK(denali->flash_bank);
		index_addr(denali, addr | 0, 0x90);
		index_addr(denali, addr | 1, col);
		for (i = 0; i < 8; i++) {
			index_addr_read_data(denali, addr | 2, &id);
			write_byte_to_buf(denali, id);
		}
		break;
	case NAND_CMD_READ0:
	case NAND_CMD_SEQIN:
		denali->page = page;
		break;
	case NAND_CMD_RESET:
		reset_bank(denali);
		break;
	case NAND_CMD_READOOB:
		/* TODO: Read OOB data */
		break;
	default:
		pr_err(": unsupported command received 0x%x\n", cmd);
		break;
	}
}
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jason roberts
jason roberts
129
74.14%
1
14.29%
chuanxiao dong
chuanxiao dong
37
21.26%
1
14.29%
florian fainelli
florian fainelli
3
1.72%
1
14.29%
dinh nguyen
dinh nguyen
2
1.15%
1
14.29%
enrico jorns
enrico jorns
1
0.57%
1
14.29%
masahiro yamada
masahiro yamada
1
0.57%
1
14.29%
graham moore
graham moore
1
0.57%
1
14.29%
Total
174
100.00%
7
100.00%

/* end NAND core entry points */

/* Initialization code to bring the device up to a known good state */


static void denali_hw_init(struct denali_nand_info *denali)
{
	/*
         * tell driver how many bit controller will skip before
         * writing ECC code in OOB, this register may be already
         * set by firmware. So we read this value out.
         * if this value is 0, just let it be.
         */
	denali->bbtskipbytes = ioread32(denali->flash_reg +
						SPARE_AREA_SKIP_BYTES);
	detect_max_banks(denali);
	denali_nand_reset(denali);
	iowrite32(0x0F, denali->flash_reg + RB_PIN_ENABLED);
	iowrite32(CHIP_EN_DONT_CARE__FLAG,
			denali->flash_reg + CHIP_ENABLE_DONT_CARE);

	iowrite32(0xffff, denali->flash_reg + SPARE_AREA_MARKER);

	/* Should set value for these registers when init */
	iowrite32(0, denali->flash_reg + TWO_ROW_ADDR_CYCLES);
	iowrite32(1, denali->flash_reg + ECC_ENABLE);
	denali_nand_timing_set(denali);
	denali_irq_init(denali);
}

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jason roberts
jason roberts
66
65.35%
1
14.29%
chuanxiao dong
chuanxiao dong
29
28.71%
4
57.14%
jamie iles
jamie iles
5
4.95%
1
14.29%
masahiro yamada
masahiro yamada
1
0.99%
1
14.29%
Total
101
100.00%
7
100.00%

/*
 * Althogh controller spec said SLC ECC is forceb to be 4bit,
 * but denali controller in MRST only support 15bit and 8bit ECC
 * correction
 */

#define ECC_8BITS	14

#define ECC_15BITS	26



static int denali_ooblayout_ecc(struct mtd_info *mtd, int section,
				struct mtd_oob_region *oobregion)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);
	struct nand_chip *chip = mtd_to_nand(mtd);

	if (section)
		return -ERANGE;

	oobregion->offset = denali->bbtskipbytes;
	oobregion->length = chip->ecc.total;

	return 0;
}

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boris brezillon
68
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1
100.00%
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68
100.00%
1
100.00%



static int denali_ooblayout_free(struct mtd_info *mtd, int section,
				 struct mtd_oob_region *oobregion)
{
	struct denali_nand_info *denali = mtd_to_denali(mtd);
	struct nand_chip *chip = mtd_to_nand(mtd);

	if (section)
		return -ERANGE;

	oobregion->offset = chip->ecc.total + denali->bbtskipbytes;
	oobregion->length = mtd->oobsize - oobregion->offset;

	return 0;
}

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76
100.00%
1
100.00%


static const struct mtd_ooblayout_ops denali_ooblayout_ops = {
	.ecc = denali_ooblayout_ecc,
	.free = denali_ooblayout_free,
};


static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };

static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' };


static struct nand_bbt_descr bbt_main_descr = {
	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
		| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
	.offs =	8,
	.len = 4,
	.veroffs = 12,
	.maxblocks = 4,
	.pattern = bbt_pattern,
};


static struct nand_bbt_descr bbt_mirror_descr = {
	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
		| NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
	.offs =	8,
	.len = 4,
	.veroffs = 12,
	.maxblocks = 4,
	.pattern = mirror_pattern,
};

/* initialize driver data structures */


static void denali_drv_init(struct denali_nand_info *denali)
{
	denali->idx = 0;

	/* setup interrupt handler */
	/*
         * the completion object will be used to notify
         * the callee that the interrupt is done
         */
	init_completion(&denali->complete);

	/*
         * the spinlock will be used to synchronize the ISR with any
         * element that might be access shared data (interrupt status)
         */
	spin_lock_init(&denali->irq_lock);

	/* indicate that MTD has not selected a valid bank yet */
	denali->flash_bank = CHIP_SELECT_INVALID;

	/* initialize our irq_status variable to indicate no interrupts */
	denali->irq_status = 0;
}

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int denali_init(struct denali_nand_info *denali)
{
	struct mtd_info *mtd = nand_to_mtd(&denali->nand);
	int ret;

	if (denali->platform == INTEL_CE4100) {
		/*
                 * Due to a silicon limitation, we can only support
                 * ONFI timing mode 1 and below.
                 */
		if (onfi_timing_mode < -1 || onfi_timing_mode > 1) {
			pr_err("Intel CE4100 only supports ONFI timing mode 1 or below\n");
			return -EINVAL;
		}
	}

	/* allocate a temporary buffer for nand_scan_ident() */
	denali->buf.buf = devm_kzalloc(denali->dev, PAGE_SIZE,
					GFP_DMA | GFP_KERNEL);
	if (!denali->buf.buf)
		return -ENOMEM;

	mtd->dev.parent = denali->dev;
	denali_hw_init(denali);
	denali_drv_init(denali);

	/*
         * denali_isr register is done after all the hardware
         * initilization is finished
         */
	if (request_irq(denali->irq, denali_isr, IRQF_SHARED,
			DENALI_NAND_NAME, denali)) {
		pr_err("Spectra: Unable to allocate IRQ\n");
		return -ENODEV;
	}

	/* now that our ISR is registered, we can enable interrupts */
	denali_set_intr_modes(denali, true);
	mtd->name = "denali-nand";

	/* register the driver with the NAND core subsystem */
	denali->nand.select_chip = denali_select_chip;
	denali->nand.cmdfunc = denali_cmdfunc;
	denali->nand.read_byte = denali_read_byte;
	denali->nand.waitfunc = denali_waitfunc;

	/*
         * scan for NAND devices attached to the controller
         * this is the first stage in a two step process to register
         * with the nand subsystem
         */
	if (nand_scan_ident(mtd, denali->max_banks, NULL)) {
		ret = -ENXIO;
		goto failed_req_irq;
	}

	/* allocate the right size buffer now */
	devm_kfree(denali->dev, denali->buf.buf);
	denali->buf.buf = devm_kzalloc(denali->dev,
			     mtd->writesize + mtd->oobsize,
			     GFP_KERNEL);
	if (!denali->buf.buf) {
		ret = -ENOMEM;
		goto failed_req_irq;
	}

	/* Is 32-bit DMA supported? */
	ret = dma_set_mask(denali->dev, DMA_BIT_MASK(32));
	if (ret) {
		pr_err("Spectra: no usable DMA configuration\n");
		goto failed_req_irq;
	}

	denali->buf.dma_buf = dma_map_single(denali->dev, denali->buf.buf,
			     mtd->writesize + mtd->oobsize,
			     DMA_BIDIRECTIONAL);
	if (dma_mapping_error(denali->dev, denali->buf.dma_buf)) {
		dev_err(denali->dev, "Spectra: failed to map DMA buffer\n");
		ret = -EIO;
		goto failed_req_irq;
	}

	/*
         * support for multi nand
         * MTD known nothing about multi nand, so we should tell it
         * the real pagesize and anything necessery
         */
	denali->devnum = ioread32(denali->flash_reg + DEVICES_CONNECTED);
	denali->nand.chipsize <<= (denali->devnum - 1);
	denali->nand.page_shift += (denali->devnum - 1);
	denali->nand.pagemask = (denali->nand.chipsize >>
						denali->nand.page_shift) - 1;
	denali->nand.bbt_erase_shift += (denali->devnum - 1);
	denali->nand.phys_erase_shift = denali->nand.bbt_erase_shift;
	denali->nand.chip_shift += (denali->devnum - 1);
	mtd->writesize <<= (denali->devnum - 1);
	mtd->oobsize <<= (denali->devnum - 1);
	mtd->erasesize <<= (denali->devnum - 1);
	mtd->size = denali->nand.numchips * denali->nand.chipsize;
	denali->bbtskipbytes *= denali->devnum;

	/*
         * second stage of the NAND scan
         * this stage requires information regarding ECC and
         * bad block management.
         */

	/* Bad block management */
	denali->nand.bbt_td = &bbt_main_descr;
	denali->nand.bbt_md = &bbt_mirror_descr;

	/* skip the scan for now until we have OOB read and write support */
	denali->nand.bbt_options |= NAND_BBT_USE_FLASH;
	denali->nand.options |= NAND_SKIP_BBTSCAN;
	denali->nand.ecc.mode = NAND_ECC_HW_SYNDROME;

	/* no subpage writes on denali */
	denali->nand.options |= NAND_NO_SUBPAGE_WRITE;

	/*
         * Denali Controller only support 15bit and 8bit ECC in MRST,
         * so just let controller do 15bit ECC for MLC and 8bit ECC for
         * SLC if possible.
         * */
	if (!nand_is_slc(&denali->nand) &&
			(mtd->oobsize > (denali->bbtskipbytes +
			ECC_15BITS * (mtd->writesize /
			ECC_SECTOR_SIZE)))) {
		/* if MLC OOB size is large enough, use 15bit ECC*/
		denali->nand.ecc.strength = 15;
		denali->nand.ecc.bytes = ECC_15BITS;
		iowrite32(15, denali->flash_reg + ECC_CORRECTION);
	} else if (mtd->oobsize < (denali->bbtskipbytes +
			ECC_8BITS * (mtd->writesize /
			ECC_SECTOR_SIZE))) {
		pr_err("Your NAND chip OOB is not large enough to contain 8bit ECC correction codes");
		goto failed_req_irq;
	} else {
		denali->nand.ecc.strength = 8;
		denali->nand.ecc.bytes = ECC_8BITS;
		iowrite32(8, denali->flash_reg + ECC_CORRECTION);
	}

	mtd_set_ooblayout(mtd, &denali_ooblayout_ops);
	denali->nand.ecc.bytes *= denali->devnum;
	denali->nand.ecc.strength *= denali->devnum;

	/*
         * Let driver know the total blocks number and how many blocks
         * contained by each nand chip. blksperchip will help driver to
         * know how many blocks is taken by FW.
         */
	denali->totalblks = mtd->size >> denali->nand.phys_erase_shift;
	denali->blksperchip = denali->totalblks / denali->nand.numchips;

	/* override the default read operations */
	denali->nand.ecc.size = ECC_SECTOR_SIZE * denali->devnum;
	denali->nand.ecc.read_page = denali_read_page;
	denali->nand.ecc.read_page_raw = denali_read_page_raw;
	denali->nand.ecc.write_page = denali_write_page;
	denali->nand.ecc.write_page_raw = denali_write_page_raw;
	denali->nand.ecc.read_oob = denali_read_oob;
	denali->nand.ecc.write_oob = denali_write_oob;
	denali->nand.erase = denali_erase;

	if (nand_scan_tail(mtd)) {
		ret = -ENXIO;
		goto failed_req_irq;
	}

	ret = mtd_device_register(mtd, NULL, 0);
	if (ret) {
		dev_err(denali->dev, "Spectra: Failed to register MTD: %d\n",
				ret);
		goto failed_req_irq;
	}
	return 0;

failed_req_irq:
	denali_irq_cleanup(denali->irq, denali);

	return ret;
}
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296
32.03%
8
33.33%
huang shijie
huang shijie
142
15.37%
2
8.33%
boris brezillon
boris brezillon
36
3.90%
2
8.33%
mike dunn
mike dunn
26
2.81%
1
4.17%
dinh nguyen
dinh nguyen
21
2.27%
1
4.17%
brian norris
brian norris
10
1.08%
3
12.50%
graham moore
graham moore
9
0.97%
1
4.17%
jamie iles
jamie iles
9
0.97%
3
12.50%
masahiro yamada
masahiro yamada
8
0.87%
2
8.33%
Total
924
100.00%
24
100.00%


EXPORT_SYMBOL(denali_init);

/* driver exit point */


void denali_remove(struct denali_nand_info *denali)
{
	struct mtd_info *mtd = nand_to_mtd(&denali->nand);
	/*
         * Pre-compute DMA buffer size to avoid any problems in case
         * nand_release() ever changes in a way that mtd->writesize and
         * mtd->oobsize are not reliable after this call.
         */
	int bufsize = mtd->writesize + mtd->oobsize;

	nand_release(mtd);
	denali_irq_cleanup(denali->irq, denali);
	dma_unmap_single(denali->dev, denali->buf.dma_buf, bufsize,
			 DMA_BIDIRECTIONAL);
}
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40.91%
1
20.00%
dinh nguyen
dinh nguyen
5
7.58%
1
20.00%
jamie iles
jamie iles
3
4.55%
1
20.00%
Total
66
100.00%
5
100.00%


EXPORT_SYMBOL(denali_remove);
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5456
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chuanxiao dong
734
10.33%
15
28.85%
boris brezillon
boris brezillon
276
3.88%
4
7.69%
jamie iles
jamie iles
205
2.88%
5
9.62%
huang shijie
huang shijie
142
2.00%
2
3.85%
masahiro yamada
masahiro yamada
102
1.44%
6
11.54%
mike dunn
mike dunn
53
0.75%
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3.85%
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graham moore
48
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4
7.69%
dinh nguyen
dinh nguyen
36
0.51%
1
1.92%
brian norris
brian norris
26
0.37%
5
9.62%
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david woodhouse
11
0.15%
1
1.92%
josh wu
josh wu
10
0.14%
1
1.92%
florian fainelli
florian fainelli
3
0.04%
1
1.92%
david s. miller
david s. miller
3
0.04%
1
1.92%
uwe kleine-koenig
uwe kleine-koenig
1
0.01%
1
1.92%
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enrico jorns
1
0.01%
1
1.92%
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rashika kheria
1
0.01%
1
1.92%
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Directory: drivers/mtd/nand

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