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fsmc_nand.c
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/*
* drivers/mtd/nand/fsmc_nand.c
*
* ST Microelectronics
* Flexible Static Memory Controller (FSMC)
* Driver for NAND portions
*
* Copyright © 2010 ST Microelectronics
* Vipin Kumar <[email protected]>
* Ashish Priyadarshi
*
* Based on drivers/mtd/nand/nomadik_nand.c
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/dmaengine.h>
#include <linux/dma-direction.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/resource.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/mtd/partitions.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/mtd/fsmc.h>
#include <linux/amba/bus.h>
#include <mtd/mtd-abi.h>
static struct nand_ecclayout fsmc_ecc1_128_layout = {
.eccbytes = 24,
.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52,
66, 67, 68, 82, 83, 84, 98, 99, 100, 114, 115, 116},
.oobfree = {
{.offset = 8, .length = 8},
{.offset = 24, .length = 8},
{.offset = 40, .length = 8},
{.offset = 56, .length = 8},
{.offset = 72, .length = 8},
{.offset = 88, .length = 8},
{.offset = 104, .length = 8},
{.offset = 120, .length = 8}
}
};
static struct nand_ecclayout fsmc_ecc1_64_layout = {
.eccbytes = 12,
.eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52},
.oobfree = {
{.offset = 8, .length = 8},
{.offset = 24, .length = 8},
{.offset = 40, .length = 8},
{.offset = 56, .length = 8},
}
};
static struct nand_ecclayout fsmc_ecc1_16_layout = {
.eccbytes = 3,
.eccpos = {2, 3, 4},
.oobfree = {
{.offset = 8, .length = 8},
}
};
/*
* ECC4 layout for NAND of pagesize 8192 bytes & OOBsize 256 bytes. 13*16 bytes
* of OB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 46
* bytes are free for use.
*/
static struct nand_ecclayout fsmc_ecc4_256_layout = {
.eccbytes = 208,
.eccpos = { 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14,
18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30,
34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46,
50, 51, 52, 53, 54, 55, 56,
57, 58, 59, 60, 61, 62,
66, 67, 68, 69, 70, 71, 72,
73, 74, 75, 76, 77, 78,
82, 83, 84, 85, 86, 87, 88,
89, 90, 91, 92, 93, 94,
98, 99, 100, 101, 102, 103, 104,
105, 106, 107, 108, 109, 110,
114, 115, 116, 117, 118, 119, 120,
121, 122, 123, 124, 125, 126,
130, 131, 132, 133, 134, 135, 136,
137, 138, 139, 140, 141, 142,
146, 147, 148, 149, 150, 151, 152,
153, 154, 155, 156, 157, 158,
162, 163, 164, 165, 166, 167, 168,
169, 170, 171, 172, 173, 174,
178, 179, 180, 181, 182, 183, 184,
185, 186, 187, 188, 189, 190,
194, 195, 196, 197, 198, 199, 200,
201, 202, 203, 204, 205, 206,
210, 211, 212, 213, 214, 215, 216,
217, 218, 219, 220, 221, 222,
226, 227, 228, 229, 230, 231, 232,
233, 234, 235, 236, 237, 238,
242, 243, 244, 245, 246, 247, 248,
249, 250, 251, 252, 253, 254
},
.oobfree = {
{.offset = 15, .length = 3},
{.offset = 31, .length = 3},
{.offset = 47, .length = 3},
{.offset = 63, .length = 3},
{.offset = 79, .length = 3},
{.offset = 95, .length = 3},
{.offset = 111, .length = 3},
{.offset = 127, .length = 3},
{.offset = 143, .length = 3},
{.offset = 159, .length = 3},
{.offset = 175, .length = 3},
{.offset = 191, .length = 3},
{.offset = 207, .length = 3},
{.offset = 223, .length = 3},
{.offset = 239, .length = 3},
{.offset = 255, .length = 1}
}
};
/*
* ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 224 bytes. 13*8 bytes
* of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 118
* bytes are free for use.
*/
static struct nand_ecclayout fsmc_ecc4_224_layout = {
.eccbytes = 104,
.eccpos = { 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14,
18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30,
34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46,
50, 51, 52, 53, 54, 55, 56,
57, 58, 59, 60, 61, 62,
66, 67, 68, 69, 70, 71, 72,
73, 74, 75, 76, 77, 78,
82, 83, 84, 85, 86, 87, 88,
89, 90, 91, 92, 93, 94,
98, 99, 100, 101, 102, 103, 104,
105, 106, 107, 108, 109, 110,
114, 115, 116, 117, 118, 119, 120,
121, 122, 123, 124, 125, 126
},
.oobfree = {
{.offset = 15, .length = 3},
{.offset = 31, .length = 3},
{.offset = 47, .length = 3},
{.offset = 63, .length = 3},
{.offset = 79, .length = 3},
{.offset = 95, .length = 3},
{.offset = 111, .length = 3},
{.offset = 127, .length = 97}
}
};
/*
* ECC4 layout for NAND of pagesize 4096 bytes & OOBsize 128 bytes. 13*8 bytes
* of OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block & 22
* bytes are free for use.
*/
static struct nand_ecclayout fsmc_ecc4_128_layout = {
.eccbytes = 104,
.eccpos = { 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14,
18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30,
34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46,
50, 51, 52, 53, 54, 55, 56,
57, 58, 59, 60, 61, 62,
66, 67, 68, 69, 70, 71, 72,
73, 74, 75, 76, 77, 78,
82, 83, 84, 85, 86, 87, 88,
89, 90, 91, 92, 93, 94,
98, 99, 100, 101, 102, 103, 104,
105, 106, 107, 108, 109, 110,
114, 115, 116, 117, 118, 119, 120,
121, 122, 123, 124, 125, 126
},
.oobfree = {
{.offset = 15, .length = 3},
{.offset = 31, .length = 3},
{.offset = 47, .length = 3},
{.offset = 63, .length = 3},
{.offset = 79, .length = 3},
{.offset = 95, .length = 3},
{.offset = 111, .length = 3},
{.offset = 127, .length = 1}
}
};
/*
* ECC4 layout for NAND of pagesize 2048 bytes & OOBsize 64 bytes. 13*4 bytes of
* OOB size is reserved for ECC, Byte no. 0 & 1 reserved for bad block and 10
* bytes are free for use.
*/
static struct nand_ecclayout fsmc_ecc4_64_layout = {
.eccbytes = 52,
.eccpos = { 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14,
18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30,
34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46,
50, 51, 52, 53, 54, 55, 56,
57, 58, 59, 60, 61, 62,
},
.oobfree = {
{.offset = 15, .length = 3},
{.offset = 31, .length = 3},
{.offset = 47, .length = 3},
{.offset = 63, .length = 1},
}
};
/*
* ECC4 layout for NAND of pagesize 512 bytes & OOBsize 16 bytes. 13 bytes of
* OOB size is reserved for ECC, Byte no. 4 & 5 reserved for bad block and One
* byte is free for use.
*/
static struct nand_ecclayout fsmc_ecc4_16_layout = {
.eccbytes = 13,
.eccpos = { 0, 1, 2, 3, 6, 7, 8,
9, 10, 11, 12, 13, 14
},
.oobfree = {
{.offset = 15, .length = 1},
}
};
/*
* ECC placement definitions in oobfree type format.
* There are 13 bytes of ecc for every 512 byte block and it has to be read
* consecutively and immediately after the 512 byte data block for hardware to
* generate the error bit offsets in 512 byte data.
* Managing the ecc bytes in the following way makes it easier for software to
* read ecc bytes consecutive to data bytes. This way is similar to
* oobfree structure maintained already in generic nand driver
*/
static struct fsmc_eccplace fsmc_ecc4_lp_place = {
.eccplace = {
{.offset = 2, .length = 13},
{.offset = 18, .length = 13},
{.offset = 34, .length = 13},
{.offset = 50, .length = 13},
{.offset = 66, .length = 13},
{.offset = 82, .length = 13},
{.offset = 98, .length = 13},
{.offset = 114, .length = 13}
}
};
static struct fsmc_eccplace fsmc_ecc4_sp_place = {
.eccplace = {
{.offset = 0, .length = 4},
{.offset = 6, .length = 9}
}
};
/**
* struct fsmc_nand_data - structure for FSMC NAND device state
*
* @pid: Part ID on the AMBA PrimeCell format
* @mtd: MTD info for a NAND flash.
* @nand: Chip related info for a NAND flash.
* @partitions: Partition info for a NAND Flash.
* @nr_partitions: Total number of partition of a NAND flash.
*
* @ecc_place: ECC placing locations in oobfree type format.
* @bank: Bank number for probed device.
* @clk: Clock structure for FSMC.
*
* @read_dma_chan: DMA channel for read access
* @write_dma_chan: DMA channel for write access to NAND
* @dma_access_complete: Completion structure
*
* @data_pa: NAND Physical port for Data.
* @data_va: NAND port for Data.
* @cmd_va: NAND port for Command.
* @addr_va: NAND port for Address.
* @regs_va: FSMC regs base address.
*/
struct fsmc_nand_data {
u32 pid;
struct mtd_info mtd;
struct nand_chip nand;
struct mtd_partition *partitions;
unsigned int nr_partitions;
struct fsmc_eccplace *ecc_place;
unsigned int bank;
struct device *dev;
enum access_mode mode;
struct clk *clk;
/* DMA related objects */
struct dma_chan *read_dma_chan;
struct dma_chan *write_dma_chan;
struct completion dma_access_complete;
struct fsmc_nand_timings *dev_timings;
dma_addr_t data_pa;
void __iomem *data_va;
void __iomem *cmd_va;
void __iomem *addr_va;
void __iomem *regs_va;
void (*select_chip)(uint32_t bank, uint32_t busw);
};
/* Assert CS signal based on chipnr */
static void fsmc_select_chip(struct mtd_info *mtd, int chipnr)
{
struct nand_chip *chip = mtd->priv;
struct fsmc_nand_data *host;
host = container_of(mtd, struct fsmc_nand_data, mtd);
switch (chipnr) {
case -1:
chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
break;
case 0:
case 1:
case 2:
case 3:
if (host->select_chip)
host->select_chip(chipnr,
chip->options & NAND_BUSWIDTH_16);
break;
default:
BUG();
}
}
/*
* fsmc_cmd_ctrl - For facilitaing Hardware access
* This routine allows hardware specific access to control-lines(ALE,CLE)
*/
static void fsmc_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *this = mtd->priv;
struct fsmc_nand_data *host = container_of(mtd,
struct fsmc_nand_data, mtd);
void __iomem *regs = host->regs_va;
unsigned int bank = host->bank;
if (ctrl & NAND_CTRL_CHANGE) {
u32 pc;
if (ctrl & NAND_CLE) {
this->IO_ADDR_R = host->cmd_va;
this->IO_ADDR_W = host->cmd_va;
} else if (ctrl & NAND_ALE) {
this->IO_ADDR_R = host->addr_va;
this->IO_ADDR_W = host->addr_va;
} else {
this->IO_ADDR_R = host->data_va;
this->IO_ADDR_W = host->data_va;
}
pc = readl(FSMC_NAND_REG(regs, bank, PC));
if (ctrl & NAND_NCE)
pc |= FSMC_ENABLE;
else
pc &= ~FSMC_ENABLE;
writel_relaxed(pc, FSMC_NAND_REG(regs, bank, PC));
}
mb();
if (cmd != NAND_CMD_NONE)
writeb_relaxed(cmd, this->IO_ADDR_W);
}
/*
* fsmc_nand_setup - FSMC (Flexible Static Memory Controller) init routine
*
* This routine initializes timing parameters related to NAND memory access in
* FSMC registers
*/
static void fsmc_nand_setup(void __iomem *regs, uint32_t bank,
uint32_t busw, struct fsmc_nand_timings *timings)
{
uint32_t value = FSMC_DEVTYPE_NAND | FSMC_ENABLE | FSMC_WAITON;
uint32_t tclr, tar, thiz, thold, twait, tset;
struct fsmc_nand_timings *tims;
struct fsmc_nand_timings default_timings = {
.tclr = FSMC_TCLR_1,
.tar = FSMC_TAR_1,
.thiz = FSMC_THIZ_1,
.thold = FSMC_THOLD_4,
.twait = FSMC_TWAIT_6,
.tset = FSMC_TSET_0,
};
if (timings)
tims = timings;
else
tims = &default_timings;
tclr = (tims->tclr & FSMC_TCLR_MASK) << FSMC_TCLR_SHIFT;
tar = (tims->tar & FSMC_TAR_MASK) << FSMC_TAR_SHIFT;
thiz = (tims->thiz & FSMC_THIZ_MASK) << FSMC_THIZ_SHIFT;
thold = (tims->thold & FSMC_THOLD_MASK) << FSMC_THOLD_SHIFT;
twait = (tims->twait & FSMC_TWAIT_MASK) << FSMC_TWAIT_SHIFT;
tset = (tims->tset & FSMC_TSET_MASK) << FSMC_TSET_SHIFT;
if (busw)
writel_relaxed(value | FSMC_DEVWID_16,
FSMC_NAND_REG(regs, bank, PC));
else
writel_relaxed(value | FSMC_DEVWID_8,
FSMC_NAND_REG(regs, bank, PC));
writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) | tclr | tar,
FSMC_NAND_REG(regs, bank, PC));
writel_relaxed(thiz | thold | twait | tset,
FSMC_NAND_REG(regs, bank, COMM));
writel_relaxed(thiz | thold | twait | tset,
FSMC_NAND_REG(regs, bank, ATTRIB));
}
/*
* fsmc_enable_hwecc - Enables Hardware ECC through FSMC registers
*/
static void fsmc_enable_hwecc(struct mtd_info *mtd, int mode)
{
struct fsmc_nand_data *host = container_of(mtd,
struct fsmc_nand_data, mtd);
void __iomem *regs = host->regs_va;
uint32_t bank = host->bank;
writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) & ~FSMC_ECCPLEN_256,
FSMC_NAND_REG(regs, bank, PC));
writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) & ~FSMC_ECCEN,
FSMC_NAND_REG(regs, bank, PC));
writel_relaxed(readl(FSMC_NAND_REG(regs, bank, PC)) | FSMC_ECCEN,
FSMC_NAND_REG(regs, bank, PC));
}
/*
* fsmc_read_hwecc_ecc4 - Hardware ECC calculator for ecc4 option supported by
* FSMC. ECC is 13 bytes for 512 bytes of data (supports error correction up to
* max of 8-bits)
*/
static int fsmc_read_hwecc_ecc4(struct mtd_info *mtd, const uint8_t *data,
uint8_t *ecc)
{
struct fsmc_nand_data *host = container_of(mtd,
struct fsmc_nand_data, mtd);
void __iomem *regs = host->regs_va;
uint32_t bank = host->bank;
uint32_t ecc_tmp;
unsigned long deadline = jiffies + FSMC_BUSY_WAIT_TIMEOUT;
do {
if (readl_relaxed(FSMC_NAND_REG(regs, bank, STS)) & FSMC_CODE_RDY)
break;
else
cond_resched();
} while (!time_after_eq(jiffies, deadline));
if (time_after_eq(jiffies, deadline)) {
dev_err(host->dev, "calculate ecc timed out\n");
return -ETIMEDOUT;
}
ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC1));
ecc[0] = (uint8_t) (ecc_tmp >> 0);
ecc[1] = (uint8_t) (ecc_tmp >> 8);
ecc[2] = (uint8_t) (ecc_tmp >> 16);
ecc[3] = (uint8_t) (ecc_tmp >> 24);
ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC2));
ecc[4] = (uint8_t) (ecc_tmp >> 0);
ecc[5] = (uint8_t) (ecc_tmp >> 8);
ecc[6] = (uint8_t) (ecc_tmp >> 16);
ecc[7] = (uint8_t) (ecc_tmp >> 24);
ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC3));
ecc[8] = (uint8_t) (ecc_tmp >> 0);
ecc[9] = (uint8_t) (ecc_tmp >> 8);
ecc[10] = (uint8_t) (ecc_tmp >> 16);
ecc[11] = (uint8_t) (ecc_tmp >> 24);
ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, STS));
ecc[12] = (uint8_t) (ecc_tmp >> 16);
return 0;
}
/*
* fsmc_read_hwecc_ecc1 - Hardware ECC calculator for ecc1 option supported by
* FSMC. ECC is 3 bytes for 512 bytes of data (supports error correction up to
* max of 1-bit)
*/
static int fsmc_read_hwecc_ecc1(struct mtd_info *mtd, const uint8_t *data,
uint8_t *ecc)
{
struct fsmc_nand_data *host = container_of(mtd,
struct fsmc_nand_data, mtd);
void __iomem *regs = host->regs_va;
uint32_t bank = host->bank;
uint32_t ecc_tmp;
ecc_tmp = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC1));
ecc[0] = (uint8_t) (ecc_tmp >> 0);
ecc[1] = (uint8_t) (ecc_tmp >> 8);
ecc[2] = (uint8_t) (ecc_tmp >> 16);
return 0;
}
/* Count the number of 0's in buff upto a max of max_bits */
static int count_written_bits(uint8_t *buff, int size, int max_bits)
{
int k, written_bits = 0;
for (k = 0; k < size; k++) {
written_bits += hweight8(~buff[k]);
if (written_bits > max_bits)
break;
}
return written_bits;
}
static void dma_complete(void *param)
{
struct fsmc_nand_data *host = param;
complete(&host->dma_access_complete);
}
static int dma_xfer(struct fsmc_nand_data *host, void *buffer, int len,
enum dma_data_direction direction)
{
struct dma_chan *chan;
struct dma_device *dma_dev;
struct dma_async_tx_descriptor *tx;
dma_addr_t dma_dst, dma_src, dma_addr;
dma_cookie_t cookie;
unsigned long flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
int ret;
if (direction == DMA_TO_DEVICE)
chan = host->write_dma_chan;
else if (direction == DMA_FROM_DEVICE)
chan = host->read_dma_chan;
else
return -EINVAL;
dma_dev = chan->device;
dma_addr = dma_map_single(dma_dev->dev, buffer, len, direction);
if (direction == DMA_TO_DEVICE) {
dma_src = dma_addr;
dma_dst = host->data_pa;
} else {
dma_src = host->data_pa;
dma_dst = dma_addr;
}
tx = dma_dev->device_prep_dma_memcpy(chan, dma_dst, dma_src,
len, flags);
if (!tx) {
dev_err(host->dev, "device_prep_dma_memcpy error\n");
ret = -EIO;
goto unmap_dma;
}
tx->callback = dma_complete;
tx->callback_param = host;
cookie = tx->tx_submit(tx);
ret = dma_submit_error(cookie);
if (ret) {
dev_err(host->dev, "dma_submit_error %d\n", cookie);
goto unmap_dma;
}
dma_async_issue_pending(chan);
ret =
wait_for_completion_timeout(&host->dma_access_complete,
msecs_to_jiffies(3000));
if (ret <= 0) {
dmaengine_terminate_all(chan);
dev_err(host->dev, "wait_for_completion_timeout\n");
if (!ret)
ret = -ETIMEDOUT;
goto unmap_dma;
}
ret = 0;
unmap_dma:
dma_unmap_single(dma_dev->dev, dma_addr, len, direction);
return ret;
}
/*
* fsmc_write_buf - write buffer to chip
* @mtd: MTD device structure
* @buf: data buffer
* @len: number of bytes to write
*/
static void fsmc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
{
int i;
struct nand_chip *chip = mtd->priv;
if (IS_ALIGNED((uint32_t)buf, sizeof(uint32_t)) &&
IS_ALIGNED(len, sizeof(uint32_t))) {
uint32_t *p = (uint32_t *)buf;
len = len >> 2;
for (i = 0; i < len; i++)
writel_relaxed(p[i], chip->IO_ADDR_W);
} else {
for (i = 0; i < len; i++)
writeb_relaxed(buf[i], chip->IO_ADDR_W);
}
}
/*
* fsmc_read_buf - read chip data into buffer
* @mtd: MTD device structure
* @buf: buffer to store date
* @len: number of bytes to read
*/
static void fsmc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
int i;
struct nand_chip *chip = mtd->priv;
if (IS_ALIGNED((uint32_t)buf, sizeof(uint32_t)) &&
IS_ALIGNED(len, sizeof(uint32_t))) {
uint32_t *p = (uint32_t *)buf;
len = len >> 2;
for (i = 0; i < len; i++)
p[i] = readl_relaxed(chip->IO_ADDR_R);
} else {
for (i = 0; i < len; i++)
buf[i] = readb_relaxed(chip->IO_ADDR_R);
}
}
/*
* fsmc_read_buf_dma - read chip data into buffer
* @mtd: MTD device structure
* @buf: buffer to store date
* @len: number of bytes to read
*/
static void fsmc_read_buf_dma(struct mtd_info *mtd, uint8_t *buf, int len)
{
struct fsmc_nand_data *host;
host = container_of(mtd, struct fsmc_nand_data, mtd);
dma_xfer(host, buf, len, DMA_FROM_DEVICE);
}
/*
* fsmc_write_buf_dma - write buffer to chip
* @mtd: MTD device structure
* @buf: data buffer
* @len: number of bytes to write
*/
static void fsmc_write_buf_dma(struct mtd_info *mtd, const uint8_t *buf,
int len)
{
struct fsmc_nand_data *host;
host = container_of(mtd, struct fsmc_nand_data, mtd);
dma_xfer(host, (void *)buf, len, DMA_TO_DEVICE);
}
/*
* fsmc_read_page_hwecc
* @mtd: mtd info structure
* @chip: nand chip info structure
* @buf: buffer to store read data
* @oob_required: caller expects OOB data read to chip->oob_poi
* @page: page number to read
*
* This routine is needed for fsmc version 8 as reading from NAND chip has to be
* performed in a strict sequence as follows:
* data(512 byte) -> ecc(13 byte)
* After this read, fsmc hardware generates and reports error data bits(up to a
* max of 8 bits)
*/
static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buf, int oob_required, int page)
{
struct fsmc_nand_data *host = container_of(mtd,
struct fsmc_nand_data, mtd);
struct fsmc_eccplace *ecc_place = host->ecc_place;
int i, j, s, stat, eccsize = chip->ecc.size;
int eccbytes = chip->ecc.bytes;
int eccsteps = chip->ecc.steps;
uint8_t *p = buf;
uint8_t *ecc_calc = chip->buffers->ecccalc;
uint8_t *ecc_code = chip->buffers->ecccode;
int off, len, group = 0;
/*
* ecc_oob is intentionally taken as uint16_t. In 16bit devices, we
* end up reading 14 bytes (7 words) from oob. The local array is
* to maintain word alignment
*/
uint16_t ecc_oob[7];
uint8_t *oob = (uint8_t *)&ecc_oob[0];
unsigned int max_bitflips = 0;
for (i = 0, s = 0; s < eccsteps; s++, i += eccbytes, p += eccsize) {
chip->cmdfunc(mtd, NAND_CMD_READ0, s * eccsize, page);
chip->ecc.hwctl(mtd, NAND_ECC_READ);
chip->read_buf(mtd, p, eccsize);
for (j = 0; j < eccbytes;) {
off = ecc_place->eccplace[group].offset;
len = ecc_place->eccplace[group].length;
group++;
/*
* length is intentionally kept a higher multiple of 2
* to read at least 13 bytes even in case of 16 bit NAND
* devices
*/
if (chip->options & NAND_BUSWIDTH_16)
len = roundup(len, 2);
chip->cmdfunc(mtd, NAND_CMD_READOOB, off, page);
chip->read_buf(mtd, oob + j, len);
j += len;
}
memcpy(&ecc_code[i], oob, chip->ecc.bytes);
chip->ecc.calculate(mtd, p, &ecc_calc[i]);
stat = chip->ecc.correct(mtd, p, &ecc_code[i], &ecc_calc[i]);
if (stat < 0) {
mtd->ecc_stats.failed++;
} else {
mtd->ecc_stats.corrected += stat;
max_bitflips = max_t(unsigned int, max_bitflips, stat);
}
}
return max_bitflips;
}
/*
* fsmc_bch8_correct_data
* @mtd: mtd info structure
* @dat: buffer of read data
* @read_ecc: ecc read from device spare area
* @calc_ecc: ecc calculated from read data
*
* calc_ecc is a 104 bit information containing maximum of 8 error
* offset informations of 13 bits each in 512 bytes of read data.
*/
static int fsmc_bch8_correct_data(struct mtd_info *mtd, uint8_t *dat,
uint8_t *read_ecc, uint8_t *calc_ecc)
{
struct fsmc_nand_data *host = container_of(mtd,
struct fsmc_nand_data, mtd);
struct nand_chip *chip = mtd->priv;
void __iomem *regs = host->regs_va;
unsigned int bank = host->bank;
uint32_t err_idx[8];
uint32_t num_err, i;
uint32_t ecc1, ecc2, ecc3, ecc4;
num_err = (readl_relaxed(FSMC_NAND_REG(regs, bank, STS)) >> 10) & 0xF;
/* no bit flipping */
if (likely(num_err == 0))
return 0;
/* too many errors */
if (unlikely(num_err > 8)) {
/*
* This is a temporary erase check. A newly erased page read
* would result in an ecc error because the oob data is also
* erased to FF and the calculated ecc for an FF data is not
* FF..FF.
* This is a workaround to skip performing correction in case
* data is FF..FF
*
* Logic:
* For every page, each bit written as 0 is counted until these
* number of bits are greater than 8 (the maximum correction
* capability of FSMC for each 512 + 13 bytes)
*/
int bits_ecc = count_written_bits(read_ecc, chip->ecc.bytes, 8);
int bits_data = count_written_bits(dat, chip->ecc.size, 8);
if ((bits_ecc + bits_data) <= 8) {
if (bits_data)
memset(dat, 0xff, chip->ecc.size);
return bits_data;
}
return -EBADMSG;
}
/*
* ------------------- calc_ecc[] bit wise -----------|--13 bits--|
* |---idx[7]--|--.....-----|---idx[2]--||---idx[1]--||---idx[0]--|
*
* calc_ecc is a 104 bit information containing maximum of 8 error
* offset informations of 13 bits each. calc_ecc is copied into a
* uint64_t array and error offset indexes are populated in err_idx
* array
*/
ecc1 = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC1));
ecc2 = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC2));
ecc3 = readl_relaxed(FSMC_NAND_REG(regs, bank, ECC3));
ecc4 = readl_relaxed(FSMC_NAND_REG(regs, bank, STS));
err_idx[0] = (ecc1 >> 0) & 0x1FFF;
err_idx[1] = (ecc1 >> 13) & 0x1FFF;
err_idx[2] = (((ecc2 >> 0) & 0x7F) << 6) | ((ecc1 >> 26) & 0x3F);
err_idx[3] = (ecc2 >> 7) & 0x1FFF;
err_idx[4] = (((ecc3 >> 0) & 0x1) << 12) | ((ecc2 >> 20) & 0xFFF);
err_idx[5] = (ecc3 >> 1) & 0x1FFF;
err_idx[6] = (ecc3 >> 14) & 0x1FFF;
err_idx[7] = (((ecc4 >> 16) & 0xFF) << 5) | ((ecc3 >> 27) & 0x1F);
i = 0;
while (num_err--) {
change_bit(0, (unsigned long *)&err_idx[i]);
change_bit(1, (unsigned long *)&err_idx[i]);
if (err_idx[i] < chip->ecc.size * 8) {
change_bit(err_idx[i], (unsigned long *)dat);
i++;
}
}
return i;
}
static bool filter(struct dma_chan *chan, void *slave)
{
chan->private = slave;
return true;
}
#ifdef CONFIG_OF
static int fsmc_nand_probe_config_dt(struct platform_device *pdev,
struct device_node *np)
{
struct fsmc_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
u32 val;
/* Set default NAND width to 8 bits */
pdata->width = 8;
if (!of_property_read_u32(np, "bank-width", &val)) {
if (val == 2) {
pdata->width = 16;
} else if (val != 1) {
dev_err(&pdev->dev, "invalid bank-width %u\n", val);
return -EINVAL;
}
}
if (of_get_property(np, "nand-skip-bbtscan", NULL))
pdata->options = NAND_SKIP_BBTSCAN;
pdata->nand_timings = devm_kzalloc(&pdev->dev,
sizeof(*pdata->nand_timings), GFP_KERNEL);
if (!pdata->nand_timings)
return -ENOMEM;
of_property_read_u8_array(np, "timings", (u8 *)pdata->nand_timings,
sizeof(*pdata->nand_timings));
/* Set default NAND bank to 0 */
pdata->bank = 0;
if (!of_property_read_u32(np, "bank", &val)) {
if (val > 3) {
dev_err(&pdev->dev, "invalid bank %u\n", val);
return -EINVAL;
}
pdata->bank = val;
}
return 0;
}
#else
static int fsmc_nand_probe_config_dt(struct platform_device *pdev,
struct device_node *np)
{
return -ENOSYS;
}
#endif
/*
* fsmc_nand_probe - Probe function
* @pdev: platform device structure
*/
static int __init fsmc_nand_probe(struct platform_device *pdev)
{
struct fsmc_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node __maybe_unused *np = pdev->dev.of_node;
struct mtd_part_parser_data ppdata = {};
struct fsmc_nand_data *host;
struct mtd_info *mtd;
struct nand_chip *nand;
struct resource *res;
dma_cap_mask_t mask;
int ret = 0;
u32 pid;
int i;
if (np) {
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
pdev->dev.platform_data = pdata;
ret = fsmc_nand_probe_config_dt(pdev, np);
if (ret) {
dev_err(&pdev->dev, "no platform data\n");
return -ENODEV;
}
}
if (!pdata) {
dev_err(&pdev->dev, "platform data is NULL\n");
return -EINVAL;
}
/* Allocate memory for the device structure (and zero it) */
host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_data");
host->data_va = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->data_va))
return PTR_ERR(host->data_va);
host->data_pa = (dma_addr_t)res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_addr");
host->addr_va = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->addr_va))
return PTR_ERR(host->addr_va);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand_cmd");
host->cmd_va = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->cmd_va))
return PTR_ERR(host->cmd_va);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fsmc_regs");
host->regs_va = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->regs_va))
return PTR_ERR(host->regs_va);
host->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(host->clk)) {
dev_err(&pdev->dev, "failed to fetch block clock\n");
return PTR_ERR(host->clk);
}
ret = clk_prepare_enable(host->clk);
if (ret)
goto err_clk_prepare_enable;
/*
* This device ID is actually a common AMBA ID as used on the
* AMBA PrimeCell bus. However it is not a PrimeCell.
*/
for (pid = 0, i = 0; i < 4; i++)
pid |= (readl(host->regs_va + resource_size(res) - 0x20 + 4 * i) & 255) << (i * 8);
host->pid = pid;
dev_info(&pdev->dev, "FSMC device partno %03x, manufacturer %02x, "
"revision %02x, config %02x\n",
AMBA_PART_BITS(pid), AMBA_MANF_BITS(pid),
AMBA_REV_BITS(pid), AMBA_CONFIG_BITS(pid));
host->bank = pdata->bank;
host->select_chip = pdata->select_bank;
host->partitions = pdata->partitions;