mtd: rawnand: Pass a nand_chip object to chip->dev_ready()

Let's make the raw NAND API consistent by patching all helpers and
hooks to take a nand_chip object instead of an mtd_info one or
remove the mtd_info object when both are passed.

Let's tackle the chip->dev_ready() hook.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Boris Brezillon 2018-09-06 14:05:27 +02:00 committed by Miquel Raynal
parent 0f808c1602
commit 50a487e771
37 changed files with 68 additions and 88 deletions

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@ -130,7 +130,7 @@ static void ams_delta_hwcontrol(struct nand_chip *this, int cmd,
ams_delta_write_byte(this, cmd);
}
static int ams_delta_nand_ready(struct mtd_info *mtd)
static int ams_delta_nand_ready(struct nand_chip *this)
{
return gpio_get_value(AMS_DELTA_GPIO_PIN_NAND_RB);
}

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@ -475,9 +475,8 @@ static void atmel_nand_write_buf(struct nand_chip *chip, const u8 *buf, int len)
iowrite8_rep(nand->activecs->io.virt, buf, len);
}
static int atmel_nand_dev_ready(struct mtd_info *mtd)
static int atmel_nand_dev_ready(struct nand_chip *chip)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct atmel_nand *nand = to_atmel_nand(chip);
return gpiod_get_value(nand->activecs->rb.gpio);
@ -499,9 +498,8 @@ static void atmel_nand_select_chip(struct nand_chip *chip, int cs)
chip->dev_ready = atmel_nand_dev_ready;
}
static int atmel_hsmc_nand_dev_ready(struct mtd_info *mtd)
static int atmel_hsmc_nand_dev_ready(struct nand_chip *chip)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct atmel_nand *nand = to_atmel_nand(chip);
struct atmel_hsmc_nand_controller *nc;
u32 status;

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@ -213,7 +213,7 @@ static void au1550_hwcontrol(struct mtd_info *mtd, int cmd)
wmb(); /* Drain the writebuffer */
}
int au1550_device_ready(struct mtd_info *mtd)
int au1550_device_ready(struct nand_chip *this)
{
return (alchemy_rdsmem(AU1000_MEM_STSTAT) & 0x1) ? 1 : 0;
}
@ -341,7 +341,7 @@ static void au1550_command(struct mtd_info *mtd, unsigned command, int column, i
/* Apply a short delay always to ensure that we do wait tWB. */
ndelay(100);
/* Wait for a chip to become ready... */
for (i = this->chip_delay; !this->dev_ready(mtd) && i > 0; --i)
for (i = this->chip_delay; !this->dev_ready(this) && i > 0; --i)
udelay(1);
/* Release -CE and re-enable interrupts. */
@ -352,7 +352,7 @@ static void au1550_command(struct mtd_info *mtd, unsigned command, int column, i
/* Apply this short delay always to ensure that we do wait tWB. */
ndelay(100);
while(!this->dev_ready(mtd));
while(!this->dev_ready(this));
}
static int find_nand_cs(unsigned long nand_base)

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@ -196,9 +196,8 @@ static void bcm47xxnflash_ops_bcm4706_select_chip(struct nand_chip *chip,
return;
}
static int bcm47xxnflash_ops_bcm4706_dev_ready(struct mtd_info *mtd)
static int bcm47xxnflash_ops_bcm4706_dev_ready(struct nand_chip *nand_chip)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct bcm47xxnflash *b47n = nand_get_controller_data(nand_chip);
return !!(bcma_cc_read32(b47n->cc, BCMA_CC_NFLASH_CTL) & NCTL_READY);

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@ -100,9 +100,8 @@ static const char *part_probes[] = { "cmdlinepart", "RedBoot", NULL };
#define cafe_readl(cafe, addr) readl((cafe)->mmio + CAFE_##addr)
#define cafe_writel(cafe, datum, addr) writel(datum, (cafe)->mmio + CAFE_##addr)
static int cafe_device_ready(struct mtd_info *mtd)
static int cafe_device_ready(struct nand_chip *chip)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct cafe_priv *cafe = nand_get_controller_data(chip);
int result = !!(cafe_readl(cafe, NAND_STATUS) & 0x40000000);
uint32_t irqs = cafe_readl(cafe, NAND_IRQ);

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@ -119,7 +119,7 @@ static void cmx270_hwcontrol(struct nand_chip *this, int dat,
/*
* read device ready pin
*/
static int cmx270_device_ready(struct mtd_info *mtd)
static int cmx270_device_ready(struct nand_chip *this)
{
dsb();

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@ -141,9 +141,8 @@ static void cs553x_hwcontrol(struct nand_chip *this, int cmd,
cs553x_write_byte(this, cmd);
}
static int cs553x_device_ready(struct mtd_info *mtd)
static int cs553x_device_ready(struct nand_chip *this)
{
struct nand_chip *this = mtd_to_nand(mtd);
void __iomem *mmio_base = this->IO_ADDR_R;
unsigned char foo = readb(mmio_base + MM_NAND_STS);

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@ -460,9 +460,9 @@ static void nand_davinci_write_buf(struct nand_chip *chip, const uint8_t *buf,
* Check hardware register for wait status. Returns 1 if device is ready,
* 0 if it is still busy.
*/
static int nand_davinci_dev_ready(struct mtd_info *mtd)
static int nand_davinci_dev_ready(struct nand_chip *chip)
{
struct davinci_nand_info *info = to_davinci_nand(mtd);
struct davinci_nand_info *info = to_davinci_nand(nand_to_mtd(chip));
return davinci_nand_readl(info, NANDFSR_OFFSET) & BIT(0);
}

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@ -296,9 +296,9 @@ static void denali_cmd_ctrl(struct nand_chip *chip, int dat, unsigned int ctrl)
denali->host_write(denali, DENALI_BANK(denali) | type, dat);
}
static int denali_dev_ready(struct mtd_info *mtd)
static int denali_dev_ready(struct nand_chip *chip)
{
struct denali_nand_info *denali = mtd_to_denali(mtd);
struct denali_nand_info *denali = mtd_to_denali(nand_to_mtd(chip));
return !!(denali_check_irq(denali) & INTR__INT_ACT);
}

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@ -739,12 +739,11 @@ static void doc2001plus_command(struct mtd_info *mtd, unsigned command, int colu
* any case on any machine. */
ndelay(100);
/* wait until command is processed */
while (!this->dev_ready(mtd)) ;
while (!this->dev_ready(this)) ;
}
static int doc200x_dev_ready(struct mtd_info *mtd)
static int doc200x_dev_ready(struct nand_chip *this)
{
struct nand_chip *this = mtd_to_nand(mtd);
struct doc_priv *doc = nand_get_controller_data(this);
void __iomem *docptr = doc->virtadr;

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@ -52,9 +52,9 @@ static inline struct fsl_upm_nand *to_fsl_upm_nand(struct mtd_info *mtdinfo)
chip);
}
static int fun_chip_ready(struct mtd_info *mtd)
static int fun_chip_ready(struct nand_chip *chip)
{
struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip));
if (gpio_get_value(fun->rnb_gpio[fun->mchip_number]))
return 1;
@ -69,7 +69,7 @@ static void fun_wait_rnb(struct fsl_upm_nand *fun)
struct mtd_info *mtd = nand_to_mtd(&fun->chip);
int cnt = 1000000;
while (--cnt && !fun_chip_ready(mtd))
while (--cnt && !fun_chip_ready(&fun->chip))
cpu_relax();
if (!cnt)
dev_err(fun->dev, "tired waiting for RNB\n");

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@ -94,9 +94,9 @@ static void gpio_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
gpio_nand_dosync(gpiomtd);
}
static int gpio_nand_devready(struct mtd_info *mtd)
static int gpio_nand_devready(struct nand_chip *chip)
{
struct gpiomtd *gpiomtd = gpio_nand_getpriv(mtd);
struct gpiomtd *gpiomtd = gpio_nand_getpriv(nand_to_mtd(chip));
return gpiod_get_value(gpiomtd->rdy);
}

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@ -816,9 +816,8 @@ static void gpmi_cmd_ctrl(struct nand_chip *chip, int data, unsigned int ctrl)
this->command_length = 0;
}
static int gpmi_dev_ready(struct mtd_info *mtd)
static int gpmi_dev_ready(struct nand_chip *chip)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct gpmi_nand_data *this = nand_get_controller_data(chip);
return gpmi_is_ready(this, this->current_chip);

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@ -127,9 +127,9 @@ static void jz_nand_cmd_ctrl(struct nand_chip *chip, int dat,
writeb(dat, chip->IO_ADDR_W);
}
static int jz_nand_dev_ready(struct mtd_info *mtd)
static int jz_nand_dev_ready(struct nand_chip *chip)
{
struct jz_nand *nand = mtd_to_jz_nand(mtd);
struct jz_nand *nand = mtd_to_jz_nand(nand_to_mtd(chip));
return gpiod_get_value_cansleep(nand->busy_gpio);
}

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@ -109,9 +109,9 @@ static void jz4780_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
writeb(cmd, cs->base + OFFSET_CMD);
}
static int jz4780_nand_dev_ready(struct mtd_info *mtd)
static int jz4780_nand_dev_ready(struct nand_chip *chip)
{
struct jz4780_nand_chip *nand = to_jz4780_nand_chip(mtd);
struct jz4780_nand_chip *nand = to_jz4780_nand_chip(nand_to_mtd(chip));
return !gpiod_get_value_cansleep(nand->busy_gpio);
}

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@ -302,9 +302,8 @@ static void lpc32xx_nand_cmd_ctrl(struct nand_chip *nand_chip, int cmd,
/*
* Read Device Ready (NAND device _and_ controller ready)
*/
static int lpc32xx_nand_device_ready(struct mtd_info *mtd)
static int lpc32xx_nand_device_ready(struct nand_chip *nand_chip)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct lpc32xx_nand_host *host = nand_get_controller_data(nand_chip);
if ((readb(MLC_ISR(host->io_base)) &

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@ -303,9 +303,8 @@ static void lpc32xx_nand_cmd_ctrl(struct nand_chip *chip, int cmd,
/*
* Read the Device Ready pin
*/
static int lpc32xx_nand_device_ready(struct mtd_info *mtd)
static int lpc32xx_nand_device_ready(struct nand_chip *chip)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct lpc32xx_nand_host *host = nand_get_controller_data(chip);
int rdy = 0;

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@ -320,7 +320,7 @@ static void ads5121_select_chip(struct nand_chip *nand, int chip)
}
/* Read NAND Ready/Busy signal */
static int mpc5121_nfc_dev_ready(struct mtd_info *mtd)
static int mpc5121_nfc_dev_ready(struct nand_chip *nand)
{
/*
* NFC handles ready/busy signal internally. Therefore, this function

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@ -402,9 +402,9 @@ static void mtk_nfc_select_chip(struct nand_chip *nand, int chip)
nfi_writel(nfc, mtk_nand->sels[chip], NFI_CSEL);
}
static int mtk_nfc_dev_ready(struct mtd_info *mtd)
static int mtk_nfc_dev_ready(struct nand_chip *nand)
{
struct mtk_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd));
struct mtk_nfc *nfc = nand_get_controller_data(nand);
if (nfi_readl(nfc, NFI_STA) & STA_BUSY)
return 0;

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@ -701,7 +701,7 @@ static void mxc_nand_enable_hwecc_v3(struct nand_chip *chip, bool enable)
}
/* This functions is used by upper layer to checks if device is ready */
static int mxc_nand_dev_ready(struct mtd_info *mtd)
static int mxc_nand_dev_ready(struct nand_chip *chip)
{
/*
* NFC handles R/B internally. Therefore, this function

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@ -603,7 +603,7 @@ static void panic_nand_wait_ready(struct mtd_info *mtd, unsigned long timeo)
/* Wait for the device to get ready */
for (i = 0; i < timeo; i++) {
if (chip->dev_ready(mtd))
if (chip->dev_ready(chip))
break;
touch_softlockup_watchdog();
mdelay(1);
@ -627,12 +627,12 @@ void nand_wait_ready(struct nand_chip *chip)
/* Wait until command is processed or timeout occurs */
timeo = jiffies + msecs_to_jiffies(timeo);
do {
if (chip->dev_ready(mtd))
if (chip->dev_ready(chip))
return;
cond_resched();
} while (time_before(jiffies, timeo));
if (!chip->dev_ready(mtd))
if (!chip->dev_ready(chip))
pr_warn_ratelimited("timeout while waiting for chip to become ready\n");
}
EXPORT_SYMBOL_GPL(nand_wait_ready);
@ -1068,7 +1068,7 @@ static void panic_nand_wait(struct mtd_info *mtd, struct nand_chip *chip,
int i;
for (i = 0; i < timeo; i++) {
if (chip->dev_ready) {
if (chip->dev_ready(mtd))
if (chip->dev_ready(chip))
break;
} else {
int ret;
@ -1116,7 +1116,7 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
timeo = jiffies + msecs_to_jiffies(timeo);
do {
if (chip->dev_ready) {
if (chip->dev_ready(mtd))
if (chip->dev_ready(chip))
break;
} else {
ret = nand_read_data_op(chip, &status,

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@ -2099,7 +2099,7 @@ static void ns_hwcontrol(struct nand_chip *chip, int cmd, unsigned int bitmask)
ns_nand_write_byte(chip, cmd);
}
static int ns_device_ready(struct mtd_info *mtd)
static int ns_device_ready(struct nand_chip *chip)
{
NS_DBG("device_ready\n");
return 1;

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@ -71,9 +71,8 @@ static void ndfc_hwcontrol(struct nand_chip *chip, int cmd, unsigned int ctrl)
writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_ALE);
}
static int ndfc_ready(struct mtd_info *mtd)
static int ndfc_ready(struct nand_chip *chip)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct ndfc_controller *ndfc = nand_get_controller_data(chip);
return in_be32(ndfc->ndfcbase + NDFC_STAT) & NDFC_STAT_IS_READY;

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@ -120,9 +120,9 @@ static int nuc900_check_rb(struct nuc900_nand *nand)
return val;
}
static int nuc900_nand_devready(struct mtd_info *mtd)
static int nuc900_nand_devready(struct nand_chip *chip)
{
struct nuc900_nand *nand = mtd_to_nuc900(mtd);
struct nuc900_nand *nand = mtd_to_nuc900(nand_to_mtd(chip));
int ready;
ready = (nuc900_check_rb(nand)) ? 1 : 0;
@ -205,7 +205,7 @@ static void nuc900_nand_command_lp(struct mtd_info *mtd, unsigned int command,
* any case on any machine. */
ndelay(100);
while (!chip->dev_ready(mtd))
while (!chip->dev_ready(chip))
;
}

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@ -1021,9 +1021,9 @@ static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
*
* Returns true if ready and false if busy.
*/
static int omap_dev_ready(struct mtd_info *mtd)
static int omap_dev_ready(struct nand_chip *chip)
{
struct omap_nand_info *info = mtd_to_omap(mtd);
struct omap_nand_info *info = mtd_to_omap(nand_to_mtd(chip));
return gpiod_get_value(info->ready_gpiod);
}

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@ -80,7 +80,7 @@ static void pasemi_hwcontrol(struct nand_chip *chip, int cmd,
inl(lpcctl);
}
int pasemi_device_ready(struct mtd_info *mtd)
int pasemi_device_ready(struct nand_chip *chip)
{
return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
}

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@ -23,13 +23,6 @@ struct plat_nand_data {
void __iomem *io_base;
};
static int plat_nand_dev_ready(struct mtd_info *mtd)
{
struct platform_nand_data *pdata = dev_get_platdata(mtd->dev.parent);
return pdata->ctrl.dev_ready(mtd_to_nand(mtd));
}
/*
* Probe for the NAND device.
*/
@ -70,10 +63,7 @@ static int plat_nand_probe(struct platform_device *pdev)
data->chip.IO_ADDR_R = data->io_base;
data->chip.IO_ADDR_W = data->io_base;
data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
if (pdata->ctrl.dev_ready)
data->chip.dev_ready = plat_nand_dev_ready;
data->chip.dev_ready = pdata->ctrl.dev_ready;
data->chip.select_chip = pdata->ctrl.select_chip;
data->chip.write_buf = pdata->ctrl.write_buf;
data->chip.read_buf = pdata->ctrl.read_buf;

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@ -373,7 +373,7 @@ static int r852_wait(struct mtd_info *mtd, struct nand_chip *chip)
msecs_to_jiffies(400) : msecs_to_jiffies(20));
while (time_before(jiffies, timeout))
if (chip->dev_ready(mtd))
if (chip->dev_ready(chip))
break;
nand_status_op(chip, &status);
@ -390,9 +390,9 @@ static int r852_wait(struct mtd_info *mtd, struct nand_chip *chip)
* Check if card is ready
*/
static int r852_ready(struct mtd_info *mtd)
static int r852_ready(struct nand_chip *chip)
{
struct r852_device *dev = r852_get_dev(mtd);
struct r852_device *dev = r852_get_dev(nand_to_mtd(chip));
return !(r852_read_reg(dev, R852_CARD_STA) & R852_CARD_STA_BUSY);
}

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@ -493,20 +493,23 @@ static void s3c2440_nand_hwcontrol(struct nand_chip *chip, int cmd,
* returns 0 if the nand is busy, 1 if it is ready
*/
static int s3c2410_nand_devready(struct mtd_info *mtd)
static int s3c2410_nand_devready(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
return readb(info->regs + S3C2410_NFSTAT) & S3C2410_NFSTAT_BUSY;
}
static int s3c2440_nand_devready(struct mtd_info *mtd)
static int s3c2440_nand_devready(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
return readb(info->regs + S3C2440_NFSTAT) & S3C2440_NFSTAT_READY;
}
static int s3c2412_nand_devready(struct mtd_info *mtd)
static int s3c2412_nand_devready(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
return readb(info->regs + S3C2412_NFSTAT) & S3C2412_NFSTAT_READY;
}

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@ -78,9 +78,9 @@ static void sharpsl_nand_hwcontrol(struct nand_chip *chip, int cmd,
writeb(cmd, chip->IO_ADDR_W);
}
static int sharpsl_nand_dev_ready(struct mtd_info *mtd)
static int sharpsl_nand_dev_ready(struct nand_chip *chip)
{
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(mtd);
struct sharpsl_nand *sharpsl = mtd_to_sharpsl(nand_to_mtd(chip));
return !((readb(sharpsl->io + FLASHCTL) & FLRYBY) == 0);
}

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@ -112,9 +112,8 @@ static void socrates_nand_cmd_ctrl(struct nand_chip *nand_chip, int cmd,
/*
* Read the Device Ready pin.
*/
static int socrates_nand_device_ready(struct mtd_info *mtd)
static int socrates_nand_device_ready(struct nand_chip *nand_chip)
{
struct nand_chip *nand_chip = mtd_to_nand(mtd);
struct socrates_nand_host *host = nand_get_controller_data(nand_chip);
if (in_be32(host->io_base) & FPGA_NAND_BUSY)

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@ -400,9 +400,8 @@ static void sunxi_nfc_dma_op_cleanup(struct mtd_info *mtd,
nfc->regs + NFC_REG_CTL);
}
static int sunxi_nfc_dev_ready(struct mtd_info *mtd)
static int sunxi_nfc_dev_ready(struct nand_chip *nand)
{
struct nand_chip *nand = mtd_to_nand(mtd);
struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand);
struct sunxi_nfc *nfc = to_sunxi_nfc(sunxi_nand->nand.controller);
u32 mask;

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@ -127,9 +127,8 @@ static void tango_cmd_ctrl(struct nand_chip *chip, int dat, unsigned int ctrl)
writeb_relaxed(dat, tchip->base + PBUS_ADDR);
}
static int tango_dev_ready(struct mtd_info *mtd)
static int tango_dev_ready(struct nand_chip *chip)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct tango_nfc *nfc = to_tango_nfc(chip->controller);
return readl_relaxed(nfc->pbus_base + PBUS_CS_CTRL) & PBUS_IORDY;

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@ -158,9 +158,9 @@ static void tmio_nand_hwcontrol(struct nand_chip *chip, int cmd,
tmio_iowrite8(cmd, chip->IO_ADDR_W);
}
static int tmio_nand_dev_ready(struct mtd_info *mtd)
static int tmio_nand_dev_ready(struct nand_chip *chip)
{
struct tmio_nand *tmio = mtd_to_tmio(mtd);
struct tmio_nand *tmio = mtd_to_tmio(nand_to_mtd(chip));
return !(tmio_ioread8(tmio->fcr + FCR_STATUS) & FCR_STATUS_BUSY);
}
@ -198,10 +198,10 @@ tmio_nand_wait(struct mtd_info *mtd, struct nand_chip *nand_chip)
tmio_iowrite8(0x81, tmio->fcr + FCR_IMR);
timeout = wait_event_timeout(nand_chip->controller->wq,
tmio_nand_dev_ready(mtd),
tmio_nand_dev_ready(nand_chip),
msecs_to_jiffies(nand_chip->state == FL_ERASING ? 400 : 20));
if (unlikely(!tmio_nand_dev_ready(mtd))) {
if (unlikely(!tmio_nand_dev_ready(nand_chip))) {
tmio_iowrite8(0x00, tmio->fcr + FCR_IMR);
dev_warn(&tmio->dev->dev, "still busy with %s after %d ms\n",
nand_chip->state == FL_ERASING ? "erase" : "program",

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@ -162,9 +162,9 @@ static void txx9ndfmc_cmd_ctrl(struct nand_chip *chip, int cmd,
mmiowb();
}
static int txx9ndfmc_dev_ready(struct mtd_info *mtd)
static int txx9ndfmc_dev_ready(struct nand_chip *chip)
{
struct platform_device *dev = mtd_to_platdev(mtd);
struct platform_device *dev = mtd_to_platdev(nand_to_mtd(chip));
return !(txx9ndfmc_read(dev, TXX9_NDFSR) & TXX9_NDFSR_BUSY);
}

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@ -121,7 +121,7 @@ static void xway_cmd_ctrl(struct nand_chip *chip, int cmd, unsigned int ctrl)
;
}
static int xway_dev_ready(struct mtd_info *mtd)
static int xway_dev_ready(struct nand_chip *chip)
{
return ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_RD;
}

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@ -1291,7 +1291,7 @@ struct nand_chip {
int (*block_bad)(struct nand_chip *chip, loff_t ofs);
int (*block_markbad)(struct nand_chip *chip, loff_t ofs);
void (*cmd_ctrl)(struct nand_chip *chip, int dat, unsigned int ctrl);
int (*dev_ready)(struct mtd_info *mtd);
int (*dev_ready)(struct nand_chip *chip);
void (*cmdfunc)(struct mtd_info *mtd, unsigned command, int column,
int page_addr);
int(*waitfunc)(struct mtd_info *mtd, struct nand_chip *this);