[U-Boot] [PATCH v2] spi: add altera spi controller support

[Scott McNutt]

Applied.
Thanks,
--Scott

Thomas Chou wrote:
> This patch adds the driver of altera spi controller, which is also
> used as epcs/spi flash controller.
> 
> With the spi_flash driver, they can replace the epcs driver at
> cpu/nios2/epcs.c.
> 
> Signed-off-by: Thomas Chou <thomas at wytron.com.tw>
> ---
>  drivers/spi/Makefile     |    1 +
>  drivers/spi/altera_spi.c |   81 ++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 82 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/spi/altera_spi.c
> 
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index f112ed0..dfcbb8b 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
>  
>  LIB	:= $(obj)libspi.a
>  
> +COBJS-$(CONFIG_ALTERA_SPI) += altera_spi.o
>  COBJS-$(CONFIG_ATMEL_DATAFLASH_SPI) += atmel_dataflash_spi.o
>  COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o
>  COBJS-$(CONFIG_BFIN_SPI) += bfin_spi.o
> diff --git a/drivers/spi/altera_spi.c b/drivers/spi/altera_spi.c
> new file mode 100644
> index 0000000..7a021d0
> --- /dev/null
> +++ b/drivers/spi/altera_spi.c
> @@ -0,0 +1,81 @@
> +/*
> + * Altera SPI driver
> + *
> + * Copyright (C) 2010 Thomas Chou <thomas at wytron.com.tw>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +#include <common.h>
> +#include <malloc.h>
> +#include <spi.h>
> +#include <asm/io.h>
> +#include <nios2-io.h>
> +
> +static nios_spi_t *nios_spi = (nios_spi_t *)CONFIG_SYS_SPI_BASE;
> +
> +void spi_init (void)
> +{
> +	/* empty read buffer */
> +	if (readl (&nios_spi->status) & NIOS_SPI_RRDY)
> +		readl (&nios_spi->rxdata);
> +	return;
> +}
> +
> +struct spi_slave *spi_setup_slave (unsigned int bus, unsigned int cs,
> +				  unsigned int max_hz, unsigned int mode)
> +{
> +	struct spi_slave *slave;
> +
> +	slave = malloc (sizeof(struct spi_slave));
> +	if (!slave)
> +		return NULL;
> +
> +	slave->bus = bus;
> +	slave->cs = cs;
> +
> +	return slave;
> +}
> +
> +void spi_free_slave (struct spi_slave *slave)
> +{
> +	free (slave);
> +}
> +
> +int spi_claim_bus (struct spi_slave *slave)
> +{
> +	return 0;
> +}
> +
> +void spi_release_bus (struct spi_slave *slave)
> +{
> +	return;
> +}
> +
> +int spi_xfer (struct spi_slave *slave, unsigned int bitlen, const void *dout,
> +	     void *din, unsigned long flags)
> +{
> +	int i, iter = bitlen >> 3;
> +	const uchar *txp = dout;
> +	uchar *rxp = din;
> +	uchar d;
> +
> +	if (flags & SPI_XFER_BEGIN) {
> +		writel (1 << slave->cs, &nios_spi->slaveselect);
> +		writel (NIOS_SPI_SSO, &nios_spi->control);
> +	}
> +
> +	for (i = 0; i < iter; i++) {
> +		writel (txp ? txp[i] : 0, &nios_spi->txdata);
> +		while (!(readl (&nios_spi->status) & NIOS_SPI_RRDY))
> +			;
> +		d = readl (&nios_spi->rxdata);
> +		if (rxp)
> +			rxp[i] = d;
> +	}
> +	if (flags & SPI_XFER_END)
> +		writel (0, &nios_spi->control);
> +
> +	return 0;
> +}