diff options
Diffstat (limited to 'drivers/spi/spi-sh-hspi.c')
| -rw-r--r-- | drivers/spi/spi-sh-hspi.c | 49 |
1 files changed, 44 insertions, 5 deletions
diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c index 796c077ef439..32f7b55fce09 100644 --- a/drivers/spi/spi-sh-hspi.c +++ b/drivers/spi/spi-sh-hspi.c @@ -68,6 +68,16 @@ static u32 hspi_read(struct hspi_priv *hspi, int reg) return ioread32(hspi->addr + reg); } +static void hspi_bit_set(struct hspi_priv *hspi, int reg, u32 mask, u32 set) +{ + u32 val = hspi_read(hspi, reg); + + val &= ~mask; + val |= set & mask; + + hspi_write(hspi, reg, val); +} + /* * transfer function */ @@ -105,6 +115,13 @@ static int hspi_unprepare_transfer(struct spi_master *master) return 0; } +#define hspi_hw_cs_enable(hspi) hspi_hw_cs_ctrl(hspi, 0) +#define hspi_hw_cs_disable(hspi) hspi_hw_cs_ctrl(hspi, 1) +static void hspi_hw_cs_ctrl(struct hspi_priv *hspi, int hi) +{ + hspi_bit_set(hspi, SPSCR, (1 << 6), (hi) << 6); +} + static void hspi_hw_setup(struct hspi_priv *hspi, struct spi_message *msg, struct spi_transfer *t) @@ -155,7 +172,7 @@ static void hspi_hw_setup(struct hspi_priv *hspi, hspi_write(hspi, SPCR, spcr); hspi_write(hspi, SPSR, 0x0); - hspi_write(hspi, SPSCR, 0x1); /* master mode */ + hspi_write(hspi, SPSCR, 0x21); /* master mode / CS control */ } static int hspi_transfer_one_message(struct spi_master *master, @@ -166,12 +183,21 @@ static int hspi_transfer_one_message(struct spi_master *master, u32 tx; u32 rx; int ret, i; + unsigned int cs_change; + const int nsecs = 50; dev_dbg(hspi->dev, "%s\n", __func__); + cs_change = 1; ret = 0; list_for_each_entry(t, &msg->transfers, transfer_list) { - hspi_hw_setup(hspi, msg, t); + + if (cs_change) { + hspi_hw_setup(hspi, msg, t); + hspi_hw_cs_enable(hspi); + ndelay(nsecs); + } + cs_change = t->cs_change; for (i = 0; i < t->len; i++) { @@ -198,9 +224,22 @@ static int hspi_transfer_one_message(struct spi_master *master, } msg->actual_length += t->len; + + if (t->delay_usecs) + udelay(t->delay_usecs); + + if (cs_change) { + ndelay(nsecs); + hspi_hw_cs_disable(hspi); + ndelay(nsecs); + } } msg->status = ret; + if (!cs_change) { + ndelay(nsecs); + hspi_hw_cs_disable(hspi); + } spi_finalize_current_message(master); return ret; @@ -229,7 +268,7 @@ static void hspi_cleanup(struct spi_device *spi) dev_dbg(dev, "%s cleanup\n", spi->modalias); } -static int __devinit hspi_probe(struct platform_device *pdev) +static int hspi_probe(struct platform_device *pdev) { struct resource *res; struct spi_master *master; @@ -300,7 +339,7 @@ static int __devinit hspi_probe(struct platform_device *pdev) return ret; } -static int __devexit hspi_remove(struct platform_device *pdev) +static int hspi_remove(struct platform_device *pdev) { struct hspi_priv *hspi = dev_get_drvdata(&pdev->dev); @@ -314,7 +353,7 @@ static int __devexit hspi_remove(struct platform_device *pdev) static struct platform_driver hspi_driver = { .probe = hspi_probe, - .remove = __devexit_p(hspi_remove), + .remove = hspi_remove, .driver = { .name = "sh-hspi", .owner = THIS_MODULE, |