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| author | Thomas Gleixner <tglx@cruncher.tec.linutronix.de> | 2006-05-23 23:25:53 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@cruncher.tec.linutronix.de> | 2006-05-23 23:25:53 +0200 |
| commit | 7abd3ef9875eb2afcdcd4f450680298a2983a55e (patch) | |
| tree | 64c19d2e5ecca182938acfcb8a172efb7d907d85 /drivers/mtd/nand/spia.c | |
| parent | 3821720d51b5f304d2c33021a82c8da70f6d6ac9 (diff) | |
| download | lwn-7abd3ef9875eb2afcdcd4f450680298a2983a55e.tar.gz lwn-7abd3ef9875eb2afcdcd4f450680298a2983a55e.zip | |
[MTD] Refactor NAND hwcontrol to cmd_ctrl
The hwcontrol function enforced a step by step state machine
for any kind of hardware chip access. Let the hardware driver
know which control bits are set and inform it about a change
of the control lines. Let the hardware driver write out the
command and address bytes directly. This gives a peformance
advantage for address bus controlled chips and simplifies the
quirks in the hardware drivers.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/mtd/nand/spia.c')
| -rw-r--r-- | drivers/mtd/nand/spia.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/drivers/mtd/nand/spia.c b/drivers/mtd/nand/spia.c index 9737f1d67c3c..1f6d429b1583 100644 --- a/drivers/mtd/nand/spia.c +++ b/drivers/mtd/nand/spia.c @@ -82,20 +82,27 @@ static const struct mtd_partition partition_info[] = { /* * hardware specific access to control-lines -*/ + * + * ctrl: + * NAND_CNE: bit 0 -> bit 2 + * NAND_CLE: bit 1 -> bit 0 + * NAND_ALE: bit 2 -> bit 1 + */ static void spia_hwcontrol(struct mtd_info *mtd, int cmd) { - switch (cmd) { + struct nand_chip *chip = mtd->priv; - case NAND_CTL_SETCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x01; break; - case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x01; break; + if (ctrl & NAND_CTRL_CHANGE) { + void __iomem *addr = spia_io_base + spia_pedr; + unsigned char bits; - case NAND_CTL_SETALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x02; break; - case NAND_CTL_CLRALE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x02; break; - - case NAND_CTL_SETNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) &= ~0x04; break; - case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (spia_io_base + spia_pedr)) |= 0x04; break; + bits = (ctrl & NAND_CNE) << 2; + bits |= (ctrl & NAND_CLE | NAND_ALE) >> 1; + writeb((readb(addr) & ~0x7) | bits, addr); } + + if (cmd != NAND_CMD_NONE) + writeb(cmd, chip->IO_ADDR_W); } /* @@ -133,7 +140,7 @@ static int __init spia_init(void) this->IO_ADDR_R = (void __iomem *)spia_fio_base; this->IO_ADDR_W = (void __iomem *)spia_fio_base; /* Set address of hardware control function */ - this->hwcontrol = spia_hwcontrol; + this->cmd_ctrl = spia_hwcontrol; /* 15 us command delay time */ this->chip_delay = 15; |