From: Wu, Josh Date: Tue, 10 Jun 2014 09:50:09 +0000 (+0800) Subject: mtd: atmel_nand: add NFC status error check X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=50e04e2f0cf25917d8bec05326d0003cc2ab25eb;p=linux-beck.git 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 Tested-by: Matthieu Crapet Signed-off-by: Brian Norris --- diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index 4f5348fd409c..22e9137412b4 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -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; diff --git a/drivers/mtd/nand/atmel_nand_nfc.h b/drivers/mtd/nand/atmel_nand_nfc.h index 4efd117cd3a3..85b8ca6af7d2 100644 --- a/drivers/mtd/nand/atmel_nand_nfc.h +++ b/drivers/mtd/nand/atmel_nand_nfc.h @@ -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