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WSL2-Linux-Kernel/drivers/mtd/nand/mxc_nand.c

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/*
* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Sascha Hauer, kernel@pengutronix.de
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that 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 Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/completion.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/mach/flash.h>
#include <linux/platform_data/mtd-mxc_nand.h>
#define DRIVER_NAME "mxc_nand"
/* Addresses for NFC registers */
#define NFC_V1_V2_BUF_SIZE (host->regs + 0x00)
#define NFC_V1_V2_BUF_ADDR (host->regs + 0x04)
#define NFC_V1_V2_FLASH_ADDR (host->regs + 0x06)
#define NFC_V1_V2_FLASH_CMD (host->regs + 0x08)
#define NFC_V1_V2_CONFIG (host->regs + 0x0a)
#define NFC_V1_V2_ECC_STATUS_RESULT (host->regs + 0x0c)
#define NFC_V1_V2_RSLTMAIN_AREA (host->regs + 0x0e)
#define NFC_V1_V2_RSLTSPARE_AREA (host->regs + 0x10)
#define NFC_V1_V2_WRPROT (host->regs + 0x12)
#define NFC_V1_UNLOCKSTART_BLKADDR (host->regs + 0x14)
#define NFC_V1_UNLOCKEND_BLKADDR (host->regs + 0x16)
#define NFC_V21_UNLOCKSTART_BLKADDR0 (host->regs + 0x20)
#define NFC_V21_UNLOCKSTART_BLKADDR1 (host->regs + 0x24)
#define NFC_V21_UNLOCKSTART_BLKADDR2 (host->regs + 0x28)
#define NFC_V21_UNLOCKSTART_BLKADDR3 (host->regs + 0x2c)
#define NFC_V21_UNLOCKEND_BLKADDR0 (host->regs + 0x22)
#define NFC_V21_UNLOCKEND_BLKADDR1 (host->regs + 0x26)
#define NFC_V21_UNLOCKEND_BLKADDR2 (host->regs + 0x2a)
#define NFC_V21_UNLOCKEND_BLKADDR3 (host->regs + 0x2e)
#define NFC_V1_V2_NF_WRPRST (host->regs + 0x18)
#define NFC_V1_V2_CONFIG1 (host->regs + 0x1a)
#define NFC_V1_V2_CONFIG2 (host->regs + 0x1c)
#define NFC_V2_CONFIG1_ECC_MODE_4 (1 << 0)
#define NFC_V1_V2_CONFIG1_SP_EN (1 << 2)
#define NFC_V1_V2_CONFIG1_ECC_EN (1 << 3)
#define NFC_V1_V2_CONFIG1_INT_MSK (1 << 4)
#define NFC_V1_V2_CONFIG1_BIG (1 << 5)
#define NFC_V1_V2_CONFIG1_RST (1 << 6)
#define NFC_V1_V2_CONFIG1_CE (1 << 7)
#define NFC_V2_CONFIG1_ONE_CYCLE (1 << 8)
#define NFC_V2_CONFIG1_PPB(x) (((x) & 0x3) << 9)
#define NFC_V2_CONFIG1_FP_INT (1 << 11)
#define NFC_V1_V2_CONFIG2_INT (1 << 15)
/*
* Operation modes for the NFC. Valid for v1, v2 and v3
* type controllers.
*/
#define NFC_CMD (1 << 0)
#define NFC_ADDR (1 << 1)
#define NFC_INPUT (1 << 2)
#define NFC_OUTPUT (1 << 3)
#define NFC_ID (1 << 4)
#define NFC_STATUS (1 << 5)
#define NFC_V3_FLASH_CMD (host->regs_axi + 0x00)
#define NFC_V3_FLASH_ADDR0 (host->regs_axi + 0x04)
#define NFC_V3_CONFIG1 (host->regs_axi + 0x34)
#define NFC_V3_CONFIG1_SP_EN (1 << 0)
#define NFC_V3_CONFIG1_RBA(x) (((x) & 0x7 ) << 4)
#define NFC_V3_ECC_STATUS_RESULT (host->regs_axi + 0x38)
#define NFC_V3_LAUNCH (host->regs_axi + 0x40)
#define NFC_V3_WRPROT (host->regs_ip + 0x0)
#define NFC_V3_WRPROT_LOCK_TIGHT (1 << 0)
#define NFC_V3_WRPROT_LOCK (1 << 1)
#define NFC_V3_WRPROT_UNLOCK (1 << 2)
#define NFC_V3_WRPROT_BLS_UNLOCK (2 << 6)
#define NFC_V3_WRPROT_UNLOCK_BLK_ADD0 (host->regs_ip + 0x04)
#define NFC_V3_CONFIG2 (host->regs_ip + 0x24)
#define NFC_V3_CONFIG2_PS_512 (0 << 0)
#define NFC_V3_CONFIG2_PS_2048 (1 << 0)
#define NFC_V3_CONFIG2_PS_4096 (2 << 0)
#define NFC_V3_CONFIG2_ONE_CYCLE (1 << 2)
#define NFC_V3_CONFIG2_ECC_EN (1 << 3)
#define NFC_V3_CONFIG2_2CMD_PHASES (1 << 4)
#define NFC_V3_CONFIG2_NUM_ADDR_PHASE0 (1 << 5)
#define NFC_V3_CONFIG2_ECC_MODE_8 (1 << 6)
#define NFC_V3_CONFIG2_PPB(x, shift) (((x) & 0x3) << shift)
#define NFC_V3_CONFIG2_NUM_ADDR_PHASE1(x) (((x) & 0x3) << 12)
#define NFC_V3_CONFIG2_INT_MSK (1 << 15)
#define NFC_V3_CONFIG2_ST_CMD(x) (((x) & 0xff) << 24)
#define NFC_V3_CONFIG2_SPAS(x) (((x) & 0xff) << 16)
#define NFC_V3_CONFIG3 (host->regs_ip + 0x28)
#define NFC_V3_CONFIG3_ADD_OP(x) (((x) & 0x3) << 0)
#define NFC_V3_CONFIG3_FW8 (1 << 3)
#define NFC_V3_CONFIG3_SBB(x) (((x) & 0x7) << 8)
#define NFC_V3_CONFIG3_NUM_OF_DEVICES(x) (((x) & 0x7) << 12)
#define NFC_V3_CONFIG3_RBB_MODE (1 << 15)
#define NFC_V3_CONFIG3_NO_SDMA (1 << 20)
#define NFC_V3_IPC (host->regs_ip + 0x2C)
#define NFC_V3_IPC_CREQ (1 << 0)
#define NFC_V3_IPC_INT (1 << 31)
#define NFC_V3_DELAY_LINE (host->regs_ip + 0x34)
struct mxc_nand_host;
struct mxc_nand_devtype_data {
void (*preset)(struct mtd_info *);
void (*send_cmd)(struct mxc_nand_host *, uint16_t, int);
void (*send_addr)(struct mxc_nand_host *, uint16_t, int);
void (*send_page)(struct mtd_info *, unsigned int);
void (*send_read_id)(struct mxc_nand_host *);
uint16_t (*get_dev_status)(struct mxc_nand_host *);
int (*check_int)(struct mxc_nand_host *);
void (*irq_control)(struct mxc_nand_host *, int);
u32 (*get_ecc_status)(struct mxc_nand_host *);
const struct mtd_ooblayout_ops *ooblayout;
void (*select_chip)(struct mtd_info *mtd, int chip);
int (*correct_data)(struct mtd_info *mtd, u_char *dat,
u_char *read_ecc, u_char *calc_ecc);
/*
* On i.MX21 the CONFIG2:INT bit cannot be read if interrupts are masked
* (CONFIG1:INT_MSK is set). To handle this the driver uses
* enable_irq/disable_irq_nosync instead of CONFIG1:INT_MSK
*/
int irqpending_quirk;
int needs_ip;
size_t regs_offset;
size_t spare0_offset;
size_t axi_offset;
int spare_len;
int eccbytes;
int eccsize;
int ppb_shift;
};
struct mxc_nand_host {
struct nand_chip nand;
struct device *dev;
void __iomem *spare0;
void __iomem *main_area0;
void __iomem *base;
void __iomem *regs;
void __iomem *regs_axi;
void __iomem *regs_ip;
int status_request;
struct clk *clk;
int clk_act;
int irq;
int eccsize;
int used_oobsize;
int active_cs;
struct completion op_completion;
uint8_t *data_buf;
unsigned int buf_start;
const struct mxc_nand_devtype_data *devtype_data;
struct mxc_nand_platform_data pdata;
};
static const char * const part_probes[] = {
"cmdlinepart", "RedBoot", "ofpart", NULL };
static void memcpy32_fromio(void *trg, const void __iomem *src, size_t size)
{
int i;
u32 *t = trg;
const __iomem u32 *s = src;
for (i = 0; i < (size >> 2); i++)
*t++ = __raw_readl(s++);
}
static void memcpy16_fromio(void *trg, const void __iomem *src, size_t size)
{
int i;
u16 *t = trg;
const __iomem u16 *s = src;
/* We assume that src (IO) is always 32bit aligned */
if (PTR_ALIGN(trg, 4) == trg && IS_ALIGNED(size, 4)) {
memcpy32_fromio(trg, src, size);
return;
}
for (i = 0; i < (size >> 1); i++)
*t++ = __raw_readw(s++);
}
static inline void memcpy32_toio(void __iomem *trg, const void *src, int size)
{
/* __iowrite32_copy use 32bit size values so divide by 4 */
__iowrite32_copy(trg, src, size / 4);
}
static void memcpy16_toio(void __iomem *trg, const void *src, int size)
{
int i;
__iomem u16 *t = trg;
const u16 *s = src;
/* We assume that trg (IO) is always 32bit aligned */
if (PTR_ALIGN(src, 4) == src && IS_ALIGNED(size, 4)) {
memcpy32_toio(trg, src, size);
return;
}
for (i = 0; i < (size >> 1); i++)
__raw_writew(*s++, t++);
}
static int check_int_v3(struct mxc_nand_host *host)
{
uint32_t tmp;
tmp = readl(NFC_V3_IPC);
if (!(tmp & NFC_V3_IPC_INT))
return 0;
tmp &= ~NFC_V3_IPC_INT;
writel(tmp, NFC_V3_IPC);
return 1;
}
static int check_int_v1_v2(struct mxc_nand_host *host)
{
uint32_t tmp;
tmp = readw(NFC_V1_V2_CONFIG2);
if (!(tmp & NFC_V1_V2_CONFIG2_INT))
return 0;
if (!host->devtype_data->irqpending_quirk)
writew(tmp & ~NFC_V1_V2_CONFIG2_INT, NFC_V1_V2_CONFIG2);
return 1;
}
static void irq_control_v1_v2(struct mxc_nand_host *host, int activate)
{
uint16_t tmp;
tmp = readw(NFC_V1_V2_CONFIG1);
if (activate)
tmp &= ~NFC_V1_V2_CONFIG1_INT_MSK;
else
tmp |= NFC_V1_V2_CONFIG1_INT_MSK;
writew(tmp, NFC_V1_V2_CONFIG1);
}
static void irq_control_v3(struct mxc_nand_host *host, int activate)
{
uint32_t tmp;
tmp = readl(NFC_V3_CONFIG2);
if (activate)
tmp &= ~NFC_V3_CONFIG2_INT_MSK;
else
tmp |= NFC_V3_CONFIG2_INT_MSK;
writel(tmp, NFC_V3_CONFIG2);
}
static void irq_control(struct mxc_nand_host *host, int activate)
{
if (host->devtype_data->irqpending_quirk) {
if (activate)
enable_irq(host->irq);
else
disable_irq_nosync(host->irq);
} else {
host->devtype_data->irq_control(host, activate);
}
}
static u32 get_ecc_status_v1(struct mxc_nand_host *host)
{
return readw(NFC_V1_V2_ECC_STATUS_RESULT);
}
static u32 get_ecc_status_v2(struct mxc_nand_host *host)
{
return readl(NFC_V1_V2_ECC_STATUS_RESULT);
}
static u32 get_ecc_status_v3(struct mxc_nand_host *host)
{
return readl(NFC_V3_ECC_STATUS_RESULT);
}
static irqreturn_t mxc_nfc_irq(int irq, void *dev_id)
{
struct mxc_nand_host *host = dev_id;
if (!host->devtype_data->check_int(host))
return IRQ_NONE;
irq_control(host, 0);
complete(&host->op_completion);
return IRQ_HANDLED;
}
/* This function polls the NANDFC to wait for the basic operation to
* complete by checking the INT bit of config2 register.
*/
static int wait_op_done(struct mxc_nand_host *host, int useirq)
{
int ret = 0;
/*
* If operation is already complete, don't bother to setup an irq or a
* loop.
*/
if (host->devtype_data->check_int(host))
return 0;
if (useirq) {
unsigned long timeout;
reinit_completion(&host->op_completion);
irq_control(host, 1);
timeout = wait_for_completion_timeout(&host->op_completion, HZ);
if (!timeout && !host->devtype_data->check_int(host)) {
dev_dbg(host->dev, "timeout waiting for irq\n");
ret = -ETIMEDOUT;
}
} else {
int max_retries = 8000;
int done;
do {
udelay(1);
done = host->devtype_data->check_int(host);
if (done)
break;
} while (--max_retries);
if (!done) {
dev_dbg(host->dev, "timeout polling for completion\n");
ret = -ETIMEDOUT;
}
}
WARN_ONCE(ret < 0, "timeout! useirq=%d\n", useirq);
return ret;
}
static void send_cmd_v3(struct mxc_nand_host *host, uint16_t cmd, int useirq)
{
/* fill command */
writel(cmd, NFC_V3_FLASH_CMD);
/* send out command */
writel(NFC_CMD, NFC_V3_LAUNCH);
/* Wait for operation to complete */
wait_op_done(host, useirq);
}
/* This function issues the specified command to the NAND device and
* waits for completion. */
static void send_cmd_v1_v2(struct mxc_nand_host *host, uint16_t cmd, int useirq)
{
pr_debug("send_cmd(host, 0x%x, %d)\n", cmd, useirq);
writew(cmd, NFC_V1_V2_FLASH_CMD);
writew(NFC_CMD, NFC_V1_V2_CONFIG2);
if (host->devtype_data->irqpending_quirk && (cmd == NAND_CMD_RESET)) {
int max_retries = 100;
/* Reset completion is indicated by NFC_CONFIG2 */
/* being set to 0 */
while (max_retries-- > 0) {
if (readw(NFC_V1_V2_CONFIG2) == 0) {
break;
}
udelay(1);
}
if (max_retries < 0)
pr_debug("%s: RESET failed\n", __func__);
} else {
/* Wait for operation to complete */
wait_op_done(host, useirq);
}
}
static void send_addr_v3(struct mxc_nand_host *host, uint16_t addr, int islast)
{
/* fill address */
writel(addr, NFC_V3_FLASH_ADDR0);
/* send out address */
writel(NFC_ADDR, NFC_V3_LAUNCH);
wait_op_done(host, 0);
}
/* This function sends an address (or partial address) to the
* NAND device. The address is used to select the source/destination for
* a NAND command. */
static void send_addr_v1_v2(struct mxc_nand_host *host, uint16_t addr, int islast)
{
pr_debug("send_addr(host, 0x%x %d)\n", addr, islast);
writew(addr, NFC_V1_V2_FLASH_ADDR);
writew(NFC_ADDR, NFC_V1_V2_CONFIG2);
/* Wait for operation to complete */
wait_op_done(host, islast);
}
static void send_page_v3(struct mtd_info *mtd, unsigned int ops)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
uint32_t tmp;
tmp = readl(NFC_V3_CONFIG1);
tmp &= ~(7 << 4);
writel(tmp, NFC_V3_CONFIG1);
/* transfer data from NFC ram to nand */
writel(ops, NFC_V3_LAUNCH);
wait_op_done(host, false);
}
static void send_page_v2(struct mtd_info *mtd, unsigned int ops)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
/* NANDFC buffer 0 is used for page read/write */
writew(host->active_cs << 4, NFC_V1_V2_BUF_ADDR);
writew(ops, NFC_V1_V2_CONFIG2);
/* Wait for operation to complete */
wait_op_done(host, true);
}
static void send_page_v1(struct mtd_info *mtd, unsigned int ops)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
int bufs, i;
if (mtd->writesize > 512)
bufs = 4;
else
bufs = 1;
for (i = 0; i < bufs; i++) {
/* NANDFC buffer 0 is used for page read/write */
writew((host->active_cs << 4) | i, NFC_V1_V2_BUF_ADDR);
writew(ops, NFC_V1_V2_CONFIG2);
/* Wait for operation to complete */
wait_op_done(host, true);
}
}
static void send_read_id_v3(struct mxc_nand_host *host)
{
/* Read ID into main buffer */
writel(NFC_ID, NFC_V3_LAUNCH);
wait_op_done(host, true);
memcpy32_fromio(host->data_buf, host->main_area0, 16);
}
/* Request the NANDFC to perform a read of the NAND device ID. */
static void send_read_id_v1_v2(struct mxc_nand_host *host)
{
/* NANDFC buffer 0 is used for device ID output */
writew(host->active_cs << 4, NFC_V1_V2_BUF_ADDR);
writew(NFC_ID, NFC_V1_V2_CONFIG2);
/* Wait for operation to complete */
wait_op_done(host, true);
memcpy32_fromio(host->data_buf, host->main_area0, 16);
}
static uint16_t get_dev_status_v3(struct mxc_nand_host *host)
{
writew(NFC_STATUS, NFC_V3_LAUNCH);
wait_op_done(host, true);
return readl(NFC_V3_CONFIG1) >> 16;
}
/* This function requests the NANDFC to perform a read of the
* NAND device status and returns the current status. */
static uint16_t get_dev_status_v1_v2(struct mxc_nand_host *host)
{
void __iomem *main_buf = host->main_area0;
uint32_t store;
uint16_t ret;
writew(host->active_cs << 4, NFC_V1_V2_BUF_ADDR);
/*
* The device status is stored in main_area0. To
* prevent corruption of the buffer save the value
* and restore it afterwards.
*/
store = readl(main_buf);
writew(NFC_STATUS, NFC_V1_V2_CONFIG2);
wait_op_done(host, true);
ret = readw(main_buf);
writel(store, main_buf);
return ret;
}
/* This functions is used by upper layer to checks if device is ready */
static int mxc_nand_dev_ready(struct mtd_info *mtd)
{
/*
* NFC handles R/B internally. Therefore, this function
* always returns status as ready.
*/
return 1;
}
static void mxc_nand_enable_hwecc(struct mtd_info *mtd, int mode)
{
/*
* If HW ECC is enabled, we turn it on during init. There is
* no need to enable again here.
*/
}
static int mxc_nand_correct_data_v1(struct mtd_info *mtd, u_char *dat,
u_char *read_ecc, u_char *calc_ecc)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
/*
* 1-Bit errors are automatically corrected in HW. No need for
* additional correction. 2-Bit errors cannot be corrected by
* HW ECC, so we need to return failure
*/
uint16_t ecc_status = get_ecc_status_v1(host);
if (((ecc_status & 0x3) == 2) || ((ecc_status >> 2) == 2)) {
pr_debug("MXC_NAND: HWECC uncorrectable 2-bit ECC error\n");
return -EBADMSG;
}
return 0;
}
static int mxc_nand_correct_data_v2_v3(struct mtd_info *mtd, u_char *dat,
u_char *read_ecc, u_char *calc_ecc)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
u32 ecc_stat, err;
int no_subpages = 1;
int ret = 0;
u8 ecc_bit_mask, err_limit;
ecc_bit_mask = (host->eccsize == 4) ? 0x7 : 0xf;
err_limit = (host->eccsize == 4) ? 0x4 : 0x8;
no_subpages = mtd->writesize >> 9;
ecc_stat = host->devtype_data->get_ecc_status(host);
do {
err = ecc_stat & ecc_bit_mask;
if (err > err_limit) {
printk(KERN_WARNING "UnCorrectable RS-ECC Error\n");
return -EBADMSG;
} else {
ret += err;
}
ecc_stat >>= 4;
} while (--no_subpages);
pr_debug("%d Symbol Correctable RS-ECC Error\n", ret);
return ret;
}
static int mxc_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
u_char *ecc_code)
{
return 0;
}
static u_char mxc_nand_read_byte(struct mtd_info *mtd)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
uint8_t ret;
/* Check for status request */
if (host->status_request)
return host->devtype_data->get_dev_status(host) & 0xFF;
if (nand_chip->options & NAND_BUSWIDTH_16) {
/* only take the lower byte of each word */
ret = *(uint16_t *)(host->data_buf + host->buf_start);
host->buf_start += 2;
} else {
ret = *(uint8_t *)(host->data_buf + host->buf_start);
host->buf_start++;
}
pr_debug("%s: ret=0x%hhx (start=%u)\n", __func__, ret, host->buf_start);
return ret;
}
static uint16_t mxc_nand_read_word(struct mtd_info *mtd)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
uint16_t ret;
ret = *(uint16_t *)(host->data_buf + host->buf_start);
host->buf_start += 2;
return ret;
}
/* Write data of length len to buffer buf. The data to be
* written on NAND Flash is first copied to RAMbuffer. After the Data Input
* Operation by the NFC, the data is written to NAND Flash */
static void mxc_nand_write_buf(struct mtd_info *mtd,
const u_char *buf, int len)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
u16 col = host->buf_start;
int n = mtd->oobsize + mtd->writesize - col;
n = min(n, len);
memcpy(host->data_buf + col, buf, n);
host->buf_start += n;
}
/* Read the data buffer from the NAND Flash. To read the data from NAND
* Flash first the data output cycle is initiated by the NFC, which copies
* the data to RAMbuffer. This data of length len is then copied to buffer buf.
*/
static void mxc_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
u16 col = host->buf_start;
int n = mtd->oobsize + mtd->writesize - col;
n = min(n, len);
memcpy(buf, host->data_buf + col, n);
host->buf_start += n;
}
/* This function is used by upper layer for select and
* deselect of the NAND chip */
static void mxc_nand_select_chip_v1_v3(struct mtd_info *mtd, int chip)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
if (chip == -1) {
/* Disable the NFC clock */
if (host->clk_act) {
clk_disable_unprepare(host->clk);
host->clk_act = 0;
}
return;
}
if (!host->clk_act) {
/* Enable the NFC clock */
clk_prepare_enable(host->clk);
host->clk_act = 1;
}
}
static void mxc_nand_select_chip_v2(struct mtd_info *mtd, int chip)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
if (chip == -1) {
/* Disable the NFC clock */
if (host->clk_act) {
clk_disable_unprepare(host->clk);
host->clk_act = 0;
}
return;
}
if (!host->clk_act) {
/* Enable the NFC clock */
clk_prepare_enable(host->clk);
host->clk_act = 1;
}
host->active_cs = chip;
writew(host->active_cs << 4, NFC_V1_V2_BUF_ADDR);
}
/*
* The controller splits a page into data chunks of 512 bytes + partial oob.
* There are writesize / 512 such chunks, the size of the partial oob parts is
* oobsize / #chunks rounded down to a multiple of 2. The last oob chunk then
* contains additionally the byte lost by rounding (if any).
* This function handles the needed shuffling between host->data_buf (which
* holds a page in natural order, i.e. writesize bytes data + oobsize bytes
* spare) and the NFC buffer.
*/
static void copy_spare(struct mtd_info *mtd, bool bfrom)
{
struct nand_chip *this = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(this);
u16 i, oob_chunk_size;
u16 num_chunks = mtd->writesize / 512;
u8 *d = host->data_buf + mtd->writesize;
u8 __iomem *s = host->spare0;
u16 sparebuf_size = host->devtype_data->spare_len;
/* size of oob chunk for all but possibly the last one */
oob_chunk_size = (host->used_oobsize / num_chunks) & ~1;
if (bfrom) {
for (i = 0; i < num_chunks - 1; i++)
memcpy16_fromio(d + i * oob_chunk_size,
s + i * sparebuf_size,
oob_chunk_size);
/* the last chunk */
memcpy16_fromio(d + i * oob_chunk_size,
s + i * sparebuf_size,
host->used_oobsize - i * oob_chunk_size);
} else {
for (i = 0; i < num_chunks - 1; i++)
memcpy16_toio(&s[i * sparebuf_size],
&d[i * oob_chunk_size],
oob_chunk_size);
/* the last chunk */
memcpy16_toio(&s[i * sparebuf_size],
&d[i * oob_chunk_size],
host->used_oobsize - i * oob_chunk_size);
}
}
/*
* MXC NANDFC can only perform full page+spare or spare-only read/write. When
* the upper layers perform a read/write buf operation, the saved column address
* is used to index into the full page. So usually this function is called with
* column == 0 (unless no column cycle is needed indicated by column == -1)
*/
static void mxc_do_addr_cycle(struct mtd_info *mtd, int column, int page_addr)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
/* Write out column address, if necessary */
if (column != -1) {
host->devtype_data->send_addr(host, column & 0xff,
page_addr == -1);
if (mtd->writesize > 512)
/* another col addr cycle for 2k page */
host->devtype_data->send_addr(host,
(column >> 8) & 0xff,
false);
}
/* Write out page address, if necessary */
if (page_addr != -1) {
/* paddr_0 - p_addr_7 */
host->devtype_data->send_addr(host, (page_addr & 0xff), false);
if (mtd->writesize > 512) {
if (mtd->size >= 0x10000000) {
/* paddr_8 - paddr_15 */
host->devtype_data->send_addr(host,
(page_addr >> 8) & 0xff,
false);
host->devtype_data->send_addr(host,
(page_addr >> 16) & 0xff,
true);
} else
/* paddr_8 - paddr_15 */
host->devtype_data->send_addr(host,
(page_addr >> 8) & 0xff, true);
} else {
/* One more address cycle for higher density devices */
if (mtd->size >= 0x4000000) {
/* paddr_8 - paddr_15 */
host->devtype_data->send_addr(host,
(page_addr >> 8) & 0xff,
false);
host->devtype_data->send_addr(host,
(page_addr >> 16) & 0xff,
true);
} else
/* paddr_8 - paddr_15 */
host->devtype_data->send_addr(host,
(page_addr >> 8) & 0xff, true);
}
}
}
static int mxc_v1_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
if (section >= nand_chip->ecc.steps)
return -ERANGE;
oobregion->offset = (section * 16) + 6;
oobregion->length = nand_chip->ecc.bytes;
return 0;
}
static int mxc_v1_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
if (section > nand_chip->ecc.steps)
return -ERANGE;
if (!section) {
if (mtd->writesize <= 512) {
oobregion->offset = 0;
oobregion->length = 5;
} else {
oobregion->offset = 2;
oobregion->length = 4;
}
} else {
oobregion->offset = ((section - 1) * 16) +
nand_chip->ecc.bytes + 6;
if (section < nand_chip->ecc.steps)
oobregion->length = (section * 16) + 6 -
oobregion->offset;
else
oobregion->length = mtd->oobsize - oobregion->offset;
}
return 0;
}
static const struct mtd_ooblayout_ops mxc_v1_ooblayout_ops = {
.ecc = mxc_v1_ooblayout_ecc,
.free = mxc_v1_ooblayout_free,
};
static int mxc_v2_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
if (section >= nand_chip->ecc.steps)
return -ERANGE;
oobregion->offset = (section * stepsize) + 7;
oobregion->length = nand_chip->ecc.bytes;
return 0;
}
static int mxc_v2_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
int stepsize = nand_chip->ecc.bytes == 9 ? 16 : 26;
if (section > nand_chip->ecc.steps)
return -ERANGE;
if (!section) {
if (mtd->writesize <= 512) {
oobregion->offset = 0;
oobregion->length = 5;
} else {
oobregion->offset = 2;
oobregion->length = 4;
}
} else {
oobregion->offset = section * stepsize;
oobregion->length = 7;
}
return 0;
}
static const struct mtd_ooblayout_ops mxc_v2_ooblayout_ops = {
.ecc = mxc_v2_ooblayout_ecc,
.free = mxc_v2_ooblayout_free,
};
/*
* v2 and v3 type controllers can do 4bit or 8bit ecc depending
* on how much oob the nand chip has. For 8bit ecc we need at least
* 26 bytes of oob data per 512 byte block.
*/
static int get_eccsize(struct mtd_info *mtd)
{
int oobbytes_per_512 = 0;
oobbytes_per_512 = mtd->oobsize * 512 / mtd->writesize;
if (oobbytes_per_512 < 26)
return 4;
else
return 8;
}
static void preset_v1(struct mtd_info *mtd)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
uint16_t config1 = 0;
if (nand_chip->ecc.mode == NAND_ECC_HW && mtd->writesize)
config1 |= NFC_V1_V2_CONFIG1_ECC_EN;
if (!host->devtype_data->irqpending_quirk)
config1 |= NFC_V1_V2_CONFIG1_INT_MSK;
host->eccsize = 1;
writew(config1, NFC_V1_V2_CONFIG1);
/* preset operation */
/* Unlock the internal RAM Buffer */
writew(0x2, NFC_V1_V2_CONFIG);
/* Blocks to be unlocked */
writew(0x0, NFC_V1_UNLOCKSTART_BLKADDR);
writew(0xffff, NFC_V1_UNLOCKEND_BLKADDR);
/* Unlock Block Command for given address range */
writew(0x4, NFC_V1_V2_WRPROT);
}
static void preset_v2(struct mtd_info *mtd)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
uint16_t config1 = 0;
config1 |= NFC_V2_CONFIG1_FP_INT;
if (!host->devtype_data->irqpending_quirk)
config1 |= NFC_V1_V2_CONFIG1_INT_MSK;
if (mtd->writesize) {
uint16_t pages_per_block = mtd->erasesize / mtd->writesize;
if (nand_chip->ecc.mode == NAND_ECC_HW)
config1 |= NFC_V1_V2_CONFIG1_ECC_EN;
host->eccsize = get_eccsize(mtd);
if (host->eccsize == 4)
config1 |= NFC_V2_CONFIG1_ECC_MODE_4;
config1 |= NFC_V2_CONFIG1_PPB(ffs(pages_per_block) - 6);
} else {
host->eccsize = 1;
}
writew(config1, NFC_V1_V2_CONFIG1);
/* preset operation */
/* Unlock the internal RAM Buffer */
writew(0x2, NFC_V1_V2_CONFIG);
/* Blocks to be unlocked */
writew(0x0, NFC_V21_UNLOCKSTART_BLKADDR0);
writew(0x0, NFC_V21_UNLOCKSTART_BLKADDR1);
writew(0x0, NFC_V21_UNLOCKSTART_BLKADDR2);
writew(0x0, NFC_V21_UNLOCKSTART_BLKADDR3);
writew(0xffff, NFC_V21_UNLOCKEND_BLKADDR0);
writew(0xffff, NFC_V21_UNLOCKEND_BLKADDR1);
writew(0xffff, NFC_V21_UNLOCKEND_BLKADDR2);
writew(0xffff, NFC_V21_UNLOCKEND_BLKADDR3);
/* Unlock Block Command for given address range */
writew(0x4, NFC_V1_V2_WRPROT);
}
static void preset_v3(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(chip);
uint32_t config2, config3;
int i, addr_phases;
writel(NFC_V3_CONFIG1_RBA(0), NFC_V3_CONFIG1);
writel(NFC_V3_IPC_CREQ, NFC_V3_IPC);
/* Unlock the internal RAM Buffer */
writel(NFC_V3_WRPROT_BLS_UNLOCK | NFC_V3_WRPROT_UNLOCK,
NFC_V3_WRPROT);
/* Blocks to be unlocked */
for (i = 0; i < NAND_MAX_CHIPS; i++)
writel(0xffff << 16, NFC_V3_WRPROT_UNLOCK_BLK_ADD0 + (i << 2));
writel(0, NFC_V3_IPC);
config2 = NFC_V3_CONFIG2_ONE_CYCLE |
NFC_V3_CONFIG2_2CMD_PHASES |
NFC_V3_CONFIG2_SPAS(mtd->oobsize >> 1) |
NFC_V3_CONFIG2_ST_CMD(0x70) |
NFC_V3_CONFIG2_INT_MSK |
NFC_V3_CONFIG2_NUM_ADDR_PHASE0;
addr_phases = fls(chip->pagemask) >> 3;
if (mtd->writesize == 2048) {
config2 |= NFC_V3_CONFIG2_PS_2048;
config2 |= NFC_V3_CONFIG2_NUM_ADDR_PHASE1(addr_phases);
} else if (mtd->writesize == 4096) {
config2 |= NFC_V3_CONFIG2_PS_4096;
config2 |= NFC_V3_CONFIG2_NUM_ADDR_PHASE1(addr_phases);
} else {
config2 |= NFC_V3_CONFIG2_PS_512;
config2 |= NFC_V3_CONFIG2_NUM_ADDR_PHASE1(addr_phases - 1);
}
if (mtd->writesize) {
if (chip->ecc.mode == NAND_ECC_HW)
config2 |= NFC_V3_CONFIG2_ECC_EN;
config2 |= NFC_V3_CONFIG2_PPB(
ffs(mtd->erasesize / mtd->writesize) - 6,
host->devtype_data->ppb_shift);
host->eccsize = get_eccsize(mtd);
if (host->eccsize == 8)
config2 |= NFC_V3_CONFIG2_ECC_MODE_8;
}
writel(config2, NFC_V3_CONFIG2);
config3 = NFC_V3_CONFIG3_NUM_OF_DEVICES(0) |
NFC_V3_CONFIG3_NO_SDMA |
NFC_V3_CONFIG3_RBB_MODE |
NFC_V3_CONFIG3_SBB(6) | /* Reset default */
NFC_V3_CONFIG3_ADD_OP(0);
if (!(chip->options & NAND_BUSWIDTH_16))
config3 |= NFC_V3_CONFIG3_FW8;
writel(config3, NFC_V3_CONFIG3);
writel(0, NFC_V3_DELAY_LINE);
}
/* Used by the upper layer to write command to NAND Flash for
* different operations to be carried out on NAND Flash */
static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
int column, int page_addr)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct mxc_nand_host *host = nand_get_controller_data(nand_chip);
pr_debug("mxc_nand_command (cmd = 0x%x, col = 0x%x, page = 0x%x)\n",
command, column, page_addr);
/* Reset command state information */
host->status_request = false;
/* Command pre-processing step */
switch (command) {
case NAND_CMD_RESET:
host->devtype_data->preset(mtd);
host->devtype_data->send_cmd(host, command, false);
break;
case NAND_CMD_STATUS:
host->buf_start = 0;
host->status_request = true;
host->devtype_data->send_cmd(host, command, true);
WARN_ONCE(column != -1 || page_addr != -1,
"Unexpected column/row value (cmd=%u, col=%d, row=%d)\n",
command, column, page_addr);
mxc_do_addr_cycle(mtd, column, page_addr);
break;
case NAND_CMD_READ0:
case NAND_CMD_READOOB:
if (command == NAND_CMD_READ0)
host->buf_start = column;
else
host->buf_start = column + mtd->writesize;
command = NAND_CMD_READ0; /* only READ0 is valid */
host->devtype_data->send_cmd(host, command, false);
WARN_ONCE(column < 0,
"Unexpected column/row value (cmd=%u, col=%d, row=%d)\n",
command, column, page_addr);
mxc_do_addr_cycle(mtd, 0, page_addr);
if (mtd->writesize > 512)
host->devtype_data->send_cmd(host,
NAND_CMD_READSTART, true);
host->devtype_data->send_page(mtd, NFC_OUTPUT);
memcpy32_fromio(host->data_buf, host->main_area0,
mtd->writesize);
copy_spare(mtd, true);
break;
case NAND_CMD_SEQIN:
if (column >= mtd->writesize)
/* call ourself to read a page */
mxc_nand_command(mtd, NAND_CMD_READ0, 0, page_addr);
host->buf_start = column;
host->devtype_data->send_cmd(host, command, false);
WARN_ONCE(column < -1,
"Unexpected column/row value (cmd=%u, col=%d, row=%d)\n",
command, column, page_addr);
mxc_do_addr_cycle(mtd, 0, page_addr);
break;
case NAND_CMD_PAGEPROG:
memcpy32_toio(host->main_area0, host->data_buf, mtd->writesize);
copy_spare(mtd, false);
host->devtype_data->send_page(mtd, NFC_INPUT);
host->devtype_data->send_cmd(host, command, true);
WARN_ONCE(column != -1 || page_addr != -1,
"Unexpected column/row value (cmd=%u, col=%d, row=%d)\n",
command, column, page_addr);
mxc_do_addr_cycle(mtd, column, page_addr);
break;
case NAND_CMD_READID:
host->devtype_data->send_cmd(host, command, true);
mxc_do_addr_cycle(mtd, column, page_addr);
host->devtype_data->send_read_id(host);
host->buf_start = 0;
break;
case NAND_CMD_ERASE1:
case NAND_CMD_ERASE2:
host->devtype_data->send_cmd(host, command, false);
WARN_ONCE(column != -1,
"Unexpected column value (cmd=%u, col=%d)\n",
command, column);
mxc_do_addr_cycle(mtd, column, page_addr);
break;
case NAND_CMD_PARAM:
host->devtype_data->send_cmd(host, command, false);
mxc_do_addr_cycle(mtd, column, page_addr);
host->devtype_data->send_page(mtd, NFC_OUTPUT);
memcpy32_fromio(host->data_buf, host->main_area0, 512);
host->buf_start = 0;
break;
default:
WARN_ONCE(1, "Unimplemented command (cmd=%u)\n",
command);
break;
}
}
/*
* The generic flash bbt decriptors overlap with our ecc
* hardware, so define some i.MX specific ones.
*/
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 = 0,
.len = 4,
.veroffs = 4,
.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 = 0,
.len = 4,
.veroffs = 4,
.maxblocks = 4,
.pattern = mirror_pattern,
};
/* v1 + irqpending_quirk: i.MX21 */
static const struct mxc_nand_devtype_data imx21_nand_devtype_data = {
.preset = preset_v1,
.send_cmd = send_cmd_v1_v2,
.send_addr = send_addr_v1_v2,
.send_page = send_page_v1,
.send_read_id = send_read_id_v1_v2,
.get_dev_status = get_dev_status_v1_v2,
.check_int = check_int_v1_v2,
.irq_control = irq_control_v1_v2,
.get_ecc_status = get_ecc_status_v1,
.ooblayout = &mxc_v1_ooblayout_ops,
.select_chip = mxc_nand_select_chip_v1_v3,
.correct_data = mxc_nand_correct_data_v1,
.irqpending_quirk = 1,
.needs_ip = 0,
.regs_offset = 0xe00,
.spare0_offset = 0x800,
.spare_len = 16,
.eccbytes = 3,
.eccsize = 1,
};
/* v1 + !irqpending_quirk: i.MX27, i.MX31 */
static const struct mxc_nand_devtype_data imx27_nand_devtype_data = {
.preset = preset_v1,
.send_cmd = send_cmd_v1_v2,
.send_addr = send_addr_v1_v2,
.send_page = send_page_v1,
.send_read_id = send_read_id_v1_v2,
.get_dev_status = get_dev_status_v1_v2,
.check_int = check_int_v1_v2,
.irq_control = irq_control_v1_v2,
.get_ecc_status = get_ecc_status_v1,
.ooblayout = &mxc_v1_ooblayout_ops,
.select_chip = mxc_nand_select_chip_v1_v3,
.correct_data = mxc_nand_correct_data_v1,
.irqpending_quirk = 0,
.needs_ip = 0,
.regs_offset = 0xe00,
.spare0_offset = 0x800,
.axi_offset = 0,
.spare_len = 16,
.eccbytes = 3,
.eccsize = 1,
};
/* v21: i.MX25, i.MX35 */
static const struct mxc_nand_devtype_data imx25_nand_devtype_data = {
.preset = preset_v2,
.send_cmd = send_cmd_v1_v2,
.send_addr = send_addr_v1_v2,
.send_page = send_page_v2,
.send_read_id = send_read_id_v1_v2,
.get_dev_status = get_dev_status_v1_v2,
.check_int = check_int_v1_v2,
.irq_control = irq_control_v1_v2,
.get_ecc_status = get_ecc_status_v2,
.ooblayout = &mxc_v2_ooblayout_ops,
.select_chip = mxc_nand_select_chip_v2,
.correct_data = mxc_nand_correct_data_v2_v3,
.irqpending_quirk = 0,
.needs_ip = 0,
.regs_offset = 0x1e00,
.spare0_offset = 0x1000,
.axi_offset = 0,
.spare_len = 64,
.eccbytes = 9,
.eccsize = 0,
};
/* v3.2a: i.MX51 */
static const struct mxc_nand_devtype_data imx51_nand_devtype_data = {
.preset = preset_v3,
.send_cmd = send_cmd_v3,
.send_addr = send_addr_v3,
.send_page = send_page_v3,
.send_read_id = send_read_id_v3,
.get_dev_status = get_dev_status_v3,
.check_int = check_int_v3,
.irq_control = irq_control_v3,
.get_ecc_status = get_ecc_status_v3,
.ooblayout = &mxc_v2_ooblayout_ops,
.select_chip = mxc_nand_select_chip_v1_v3,
.correct_data = mxc_nand_correct_data_v2_v3,
.irqpending_quirk = 0,
.needs_ip = 1,
.regs_offset = 0,
.spare0_offset = 0x1000,
.axi_offset = 0x1e00,
.spare_len = 64,
.eccbytes = 0,
.eccsize = 0,
.ppb_shift = 7,
};
/* v3.2b: i.MX53 */
static const struct mxc_nand_devtype_data imx53_nand_devtype_data = {
.preset = preset_v3,
.send_cmd = send_cmd_v3,
.send_addr = send_addr_v3,
.send_page = send_page_v3,
.send_read_id = send_read_id_v3,
.get_dev_status = get_dev_status_v3,
.check_int = check_int_v3,
.irq_control = irq_control_v3,
.get_ecc_status = get_ecc_status_v3,
.ooblayout = &mxc_v2_ooblayout_ops,
.select_chip = mxc_nand_select_chip_v1_v3,
.correct_data = mxc_nand_correct_data_v2_v3,
.irqpending_quirk = 0,
.needs_ip = 1,
.regs_offset = 0,
.spare0_offset = 0x1000,
.axi_offset = 0x1e00,
.spare_len = 64,
.eccbytes = 0,
.eccsize = 0,
.ppb_shift = 8,
};
static inline int is_imx21_nfc(struct mxc_nand_host *host)
{
return host->devtype_data == &imx21_nand_devtype_data;
}
static inline int is_imx27_nfc(struct mxc_nand_host *host)
{
return host->devtype_data == &imx27_nand_devtype_data;
}
static inline int is_imx25_nfc(struct mxc_nand_host *host)
{
return host->devtype_data == &imx25_nand_devtype_data;
}
static inline int is_imx51_nfc(struct mxc_nand_host *host)
{
return host->devtype_data == &imx51_nand_devtype_data;
}
static inline int is_imx53_nfc(struct mxc_nand_host *host)
{
return host->devtype_data == &imx53_nand_devtype_data;
}
static const struct platform_device_id mxcnd_devtype[] = {
{
.name = "imx21-nand",
.driver_data = (kernel_ulong_t) &imx21_nand_devtype_data,
}, {
.name = "imx27-nand",
.driver_data = (kernel_ulong_t) &imx27_nand_devtype_data,
}, {
.name = "imx25-nand",
.driver_data = (kernel_ulong_t) &imx25_nand_devtype_data,
}, {
.name = "imx51-nand",
.driver_data = (kernel_ulong_t) &imx51_nand_devtype_data,
}, {
.name = "imx53-nand",
.driver_data = (kernel_ulong_t) &imx53_nand_devtype_data,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, mxcnd_devtype);
#ifdef CONFIG_OF_MTD
static const struct of_device_id mxcnd_dt_ids[] = {
{
.compatible = "fsl,imx21-nand",
.data = &imx21_nand_devtype_data,
}, {
.compatible = "fsl,imx27-nand",
.data = &imx27_nand_devtype_data,
}, {
.compatible = "fsl,imx25-nand",
.data = &imx25_nand_devtype_data,
}, {
.compatible = "fsl,imx51-nand",
.data = &imx51_nand_devtype_data,
}, {
.compatible = "fsl,imx53-nand",
.data = &imx53_nand_devtype_data,
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxcnd_dt_ids);
static int __init mxcnd_probe_dt(struct mxc_nand_host *host)
{
struct device_node *np = host->dev->of_node;
const struct of_device_id *of_id =
of_match_device(mxcnd_dt_ids, host->dev);
if (!np)
return 1;
host->devtype_data = of_id->data;
return 0;
}
#else
static int __init mxcnd_probe_dt(struct mxc_nand_host *host)
{
return 1;
}
#endif
static int mxcnd_probe(struct platform_device *pdev)
{
struct nand_chip *this;
struct mtd_info *mtd;
struct mxc_nand_host *host;
struct resource *res;
int err = 0;
/* Allocate memory for MTD device structure and private data */
host = devm_kzalloc(&pdev->dev, sizeof(struct mxc_nand_host),
GFP_KERNEL);
if (!host)
return -ENOMEM;
/* allocate a temporary buffer for the nand_scan_ident() */
host->data_buf = devm_kzalloc(&pdev->dev, PAGE_SIZE, GFP_KERNEL);
if (!host->data_buf)
return -ENOMEM;
host->dev = &pdev->dev;
/* structures must be linked */
this = &host->nand;
mtd = nand_to_mtd(this);
mtd->dev.parent = &pdev->dev;
mtd->name = DRIVER_NAME;
/* 50 us command delay time */
this->chip_delay = 5;
nand_set_controller_data(this, host);
nand_set_flash_node(this, pdev->dev.of_node),
this->dev_ready = mxc_nand_dev_ready;
this->cmdfunc = mxc_nand_command;
this->read_byte = mxc_nand_read_byte;
this->read_word = mxc_nand_read_word;
this->write_buf = mxc_nand_write_buf;
this->read_buf = mxc_nand_read_buf;
host->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(host->clk))
return PTR_ERR(host->clk);
err = mxcnd_probe_dt(host);
if (err > 0) {
struct mxc_nand_platform_data *pdata =
dev_get_platdata(&pdev->dev);
if (pdata) {
host->pdata = *pdata;
host->devtype_data = (struct mxc_nand_devtype_data *)
pdev->id_entry->driver_data;
} else {
err = -ENODEV;
}
}
if (err < 0)
return err;
if (host->devtype_data->needs_ip) {
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->regs_ip = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->regs_ip))
return PTR_ERR(host->regs_ip);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
} else {
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
}
host->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->base))
return PTR_ERR(host->base);
host->main_area0 = host->base;
if (host->devtype_data->regs_offset)
host->regs = host->base + host->devtype_data->regs_offset;
host->spare0 = host->base + host->devtype_data->spare0_offset;
if (host->devtype_data->axi_offset)
host->regs_axi = host->base + host->devtype_data->axi_offset;
this->ecc.bytes = host->devtype_data->eccbytes;
host->eccsize = host->devtype_data->eccsize;
this->select_chip = host->devtype_data->select_chip;
this->ecc.size = 512;
mtd_set_ooblayout(mtd, host->devtype_data->ooblayout);
if (host->pdata.hw_ecc) {
this->ecc.mode = NAND_ECC_HW;
} else {
this->ecc.mode = NAND_ECC_SOFT;
this->ecc.algo = NAND_ECC_HAMMING;
}
/* NAND bus width determines access functions used by upper layer */
if (host->pdata.width == 2)
this->options |= NAND_BUSWIDTH_16;
/* update flash based bbt */
if (host->pdata.flash_bbt)
this->bbt_options |= NAND_BBT_USE_FLASH;
init_completion(&host->op_completion);
host->irq = platform_get_irq(pdev, 0);
if (host->irq < 0)
return host->irq;
/*
* Use host->devtype_data->irq_control() here instead of irq_control()
* because we must not disable_irq_nosync without having requested the
* irq.
*/
host->devtype_data->irq_control(host, 0);
err = devm_request_irq(&pdev->dev, host->irq, mxc_nfc_irq,
0, DRIVER_NAME, host);
if (err)
return err;
err = clk_prepare_enable(host->clk);
if (err)
return err;
host->clk_act = 1;
/*
* Now that we "own" the interrupt make sure the interrupt mask bit is
* cleared on i.MX21. Otherwise we can't read the interrupt status bit
* on this machine.
*/
if (host->devtype_data->irqpending_quirk) {
disable_irq_nosync(host->irq);
host->devtype_data->irq_control(host, 1);
}
/* first scan to find the device and get the page size */
if (nand_scan_ident(mtd, is_imx25_nfc(host) ? 4 : 1, NULL)) {
err = -ENXIO;
goto escan;
}
switch (this->ecc.mode) {
case NAND_ECC_HW:
this->ecc.calculate = mxc_nand_calculate_ecc;
this->ecc.hwctl = mxc_nand_enable_hwecc;
this->ecc.correct = host->devtype_data->correct_data;
break;
case NAND_ECC_SOFT:
break;
default:
err = -EINVAL;
goto escan;
}
if (this->bbt_options & NAND_BBT_USE_FLASH) {
this->bbt_td = &bbt_main_descr;
this->bbt_md = &bbt_mirror_descr;
}
/* allocate the right size buffer now */
devm_kfree(&pdev->dev, (void *)host->data_buf);
host->data_buf = devm_kzalloc(&pdev->dev, mtd->writesize + mtd->oobsize,
GFP_KERNEL);
if (!host->data_buf) {
err = -ENOMEM;
goto escan;
}
/* Call preset again, with correct writesize this time */
host->devtype_data->preset(mtd);
if (!this->ecc.bytes) {
if (host->eccsize == 8)
this->ecc.bytes = 18;
else if (host->eccsize == 4)
this->ecc.bytes = 9;
}
/*
* Experimentation shows that i.MX NFC can only handle up to 218 oob
* bytes. Limit used_oobsize to 218 so as to not confuse copy_spare()
* into copying invalid data to/from the spare IO buffer, as this
* might cause ECC data corruption when doing sub-page write to a
* partially written page.
*/
host->used_oobsize = min(mtd->oobsize, 218U);
if (this->ecc.mode == NAND_ECC_HW) {
if (is_imx21_nfc(host) || is_imx27_nfc(host))
this->ecc.strength = 1;
else
this->ecc.strength = (host->eccsize == 4) ? 4 : 8;
}
/* second phase scan */
if (nand_scan_tail(mtd)) {
err = -ENXIO;
goto escan;
}
/* Register the partitions */
mtd_device_parse_register(mtd, part_probes,
NULL,
host->pdata.parts,
host->pdata.nr_parts);
platform_set_drvdata(pdev, host);
return 0;
escan:
if (host->clk_act)
clk_disable_unprepare(host->clk);
return err;
}
static int mxcnd_remove(struct platform_device *pdev)
{
struct mxc_nand_host *host = platform_get_drvdata(pdev);
nand_release(nand_to_mtd(&host->nand));
if (host->clk_act)
clk_disable_unprepare(host->clk);
return 0;
}
static struct platform_driver mxcnd_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = of_match_ptr(mxcnd_dt_ids),
},
.id_table = mxcnd_devtype,
.probe = mxcnd_probe,
.remove = mxcnd_remove,
};
module_platform_driver(mxcnd_driver);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("MXC NAND MTD driver");
MODULE_LICENSE("GPL");
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