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mtd: atmel_nand: add NFC status error check 

Add a new function to read the NFC status. Meantime, this function will
check if there is any errors in NFC.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Tested-by: Matthieu Crapet <Matthieu.Crapet@ingenico.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Wu, Josh 2014-06-10 17:50:09 +08:00 committed by Brian Norris
parent b38576667c
commit 50e04e2f0c
2 changed files with 27 additions and 1 deletions
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24
drivers/mtd/nand/atmel_nand.c
View File

@ -1572,6 +1572,25 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
return 0;
}
static inline u32 nfc_read_status(struct atmel_nand_host *host)
{
u32 err_flags = NFC_SR_DTOE | NFC_SR_UNDEF | NFC_SR_AWB | NFC_SR_ASE;
u32 nfc_status = nfc_readl(host->nfc->hsmc_regs, SR);
if (unlikely(nfc_status & err_flags)) {
if (nfc_status & NFC_SR_DTOE)
dev_err(host->dev, "NFC: Waiting Nand R/B Timeout Error\n");
else if (nfc_status & NFC_SR_UNDEF)
dev_err(host->dev, "NFC: Access Undefined Area Error\n");
else if (nfc_status & NFC_SR_AWB)
dev_err(host->dev, "NFC: Access memory While NFC is busy\n");
else if (nfc_status & NFC_SR_ASE)
dev_err(host->dev, "NFC: Access memory Size Error\n");
}
return nfc_status;
}
/* SMC interrupt service routine */
static irqreturn_t hsmc_interrupt(int irq, void *dev_id)
{
@ -1579,7 +1598,7 @@ static irqreturn_t hsmc_interrupt(int irq, void *dev_id)
u32 status, mask, pending;
irqreturn_t ret = IRQ_HANDLED;
status = nfc_readl(host->nfc->hsmc_regs, SR);
status = nfc_read_status(host);
mask = nfc_readl(host->nfc->hsmc_regs, IMR);
pending = status & mask;
@ -2209,6 +2228,9 @@ static int atmel_nand_nfc_probe(struct platform_device *pdev)
}
}
nfc_writel(nfc->hsmc_regs, IDR, 0xffffffff);
nfc_readl(nfc->hsmc_regs, SR); /* clear the NFC_SR */
nfc->is_initialized = true;
dev_info(&pdev->dev, "NFC is probed.\n");
return 0;

4
drivers/mtd/nand/atmel_nand_nfc.h
View File

@ -37,6 +37,10 @@
#define ATMEL_HSMC_NFC_SR 0x08 /* NFC Status Register */
#define NFC_SR_XFR_DONE (1 << 16)
#define NFC_SR_CMD_DONE (1 << 17)
#define NFC_SR_DTOE (1 << 20)
#define NFC_SR_UNDEF (1 << 21)
#define NFC_SR_AWB (1 << 22)
#define NFC_SR_ASE (1 << 23)
#define NFC_SR_RB_EDGE (1 << 24)
#define ATMEL_HSMC_NFC_IER 0x0c