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mtd: nand: pxa3xx: Use a completion to signal device ready 

The expected behavior of the waitfunc() NAND chip call is to wait
for the device to be READY (this is a standard chip line).
However, the current implementation does almost nothing, which opens
the possibility of issuing a command to a non-ready device.

Fix this by adding a new completion to wait for the ready event to arrive.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Ezequiel Garcia 2013-11-14 18:25:26 -03:00 committed by Brian Norris
parent 6a3e48651f
commit 55d9fd6e94
1 changed files with 24 additions and 14 deletions
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38
drivers/mtd/nand/pxa3xx_nand.c
View File

@ -37,6 +37,7 @@
#include <linux/platform_data/mtd-nand-pxa3xx.h>
#define NAND_DEV_READY_TIMEOUT 50
#define CHIP_DELAY_TIMEOUT (2 * HZ/10)
#define NAND_STOP_DELAY (2 * HZ/50)
#define PAGE_CHUNK_SIZE (2048)
@ -168,7 +169,7 @@ struct pxa3xx_nand_info {
struct clk *clk;
void __iomem *mmio_base;
unsigned long mmio_phys;
struct completion cmd_complete;
struct completion cmd_complete, dev_ready;
unsigned int buf_start;
unsigned int buf_count;
@ -198,7 +199,7 @@ struct pxa3xx_nand_info {
int use_ecc; /* use HW ECC ? */
int use_dma; /* use DMA ? */
int use_spare; /* use spare ? */
int is_ready;
int need_wait;
unsigned int fifo_size; /* max. data size in the FIFO */
unsigned int data_size; /* data to be read from FIFO */
@ -476,7 +477,7 @@ static void start_data_dma(struct pxa3xx_nand_info *info)
static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
{
struct pxa3xx_nand_info *info = devid;
unsigned int status, is_completed = 0;
unsigned int status, is_completed = 0, is_ready = 0;
unsigned int ready, cmd_done;
if (info->cs == 0) {
@ -512,8 +513,8 @@ static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
is_completed = 1;
}
if (status & ready) {
info->is_ready = 1;
info->state = STATE_READY;
is_ready = 1;
}
if (status & NDSR_WRCMDREQ) {
@ -542,6 +543,8 @@ static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
nand_writel(info, NDSR, status);
if (is_completed)
complete(&info->cmd_complete);
if (is_ready)
complete(&info->dev_ready);
NORMAL_IRQ_EXIT:
return IRQ_HANDLED;
}
@ -572,7 +575,6 @@ static int prepare_command_pool(struct pxa3xx_nand_info *info, int command,
info->oob_size = 0;
info->use_ecc = 0;
info->use_spare = 1;
info->is_ready = 0;
info->retcode = ERR_NONE;
if (info->cs != 0)
info->ndcb0 = NDCB0_CSEL;
@ -745,6 +747,8 @@ static void pxa3xx_nand_cmdfunc(struct mtd_info *mtd, unsigned command,
exec_cmd = prepare_command_pool(info, command, column, page_addr);
if (exec_cmd) {
init_completion(&info->cmd_complete);
init_completion(&info->dev_ready);
info->need_wait = 1;
pxa3xx_nand_start(info);
ret = wait_for_completion_timeout(&info->cmd_complete,
@ -859,21 +863,27 @@ static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct pxa3xx_nand_info *info = host->info_data;
int ret;
if (info->need_wait) {
ret = wait_for_completion_timeout(&info->dev_ready,
CHIP_DELAY_TIMEOUT);
info->need_wait = 0;
if (!ret) {
dev_err(&info->pdev->dev, "Ready time out!!!\n");
return NAND_STATUS_FAIL;
}
}
/* pxa3xx_nand_send_command has waited for command complete */
if (this->state == FL_WRITING || this->state == FL_ERASING) {
if (info->retcode == ERR_NONE)
return 0;
else {
/*
* any error make it return 0x01 which will tell
* the caller the erase and write fail
*/
return 0x01;
}
else
return NAND_STATUS_FAIL;
}
return 0;
return NAND_STATUS_READY;
}
static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info,
@ -1026,7 +1036,7 @@ static int pxa3xx_nand_sensing(struct pxa3xx_nand_info *info)
return ret;
chip->cmdfunc(mtd, NAND_CMD_RESET, 0, 0);
if (info->is_ready)
if (!info->need_wait)
return 0;
return -ENODEV;