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

Scott McNutt
2010-03-23T20:05:02Z

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@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@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;
> +}