Re: [spi-devel-general] [PATCH v6 1/2] spi: implemented driver for Cirrus EP93xx SPI controller

[Linus Walleij <linus.ml.walleij@gmail.com>]

2010/5/2 Mika Westerberg <mika.westerberg@iki.fi>:

> This patch adds an SPI master driver for the Cirrus EP93xx SPI controller found
> in EP93xx chips.
(...)
> +#define SSPCR0                 0x0000
> +#define SSPCR0_MODE_SHIFT      6
> +#define SSPCR0_SCR_SHIFT       8
> +
> +#define SSPCR1                 0x0004
> +#define SSPCR1_RIE             BIT(0)
> +#define SSPCR1_TIE             BIT(1)
> +#define SSPCR1_RORIE           BIT(2)
> +#define SSPCR1_LBM             BIT(3)
> +#define SSPCR1_SSE             BIT(4)
> +#define SSPCR1_MS              BIT(5)
> +#define SSPCR1_SOD             BIT(6)
> +
> +#define SSPDR                  0x0008
> +
> +#define SSPSR                  0x000c
> +#define SSPSR_TFE              BIT(0)
> +#define SSPSR_TNF              BIT(1)
> +#define SSPSR_RNE              BIT(2)
> +#define SSPSR_RFF              BIT(3)
> +#define SSPSR_BSY              BIT(4)
> +#define SSPCPSR                        0x0010
> +
> +#define SSPIIR                 0x0014
> +#define SSPIIR_RIS             BIT(0)
> +#define SSPIIR_TIS             BIT(1)
> +#define SSPIIR_RORIS           BIT(2)
> +#define SSPICR                 SSPIIR

When I look at this it's quite obvious that this is the same hardware or very
close (maybe a redux version) of the thing supported by
drivers/spi/amba-pl022.c.

What is the difference really? I suspect this is a PL022 PrimeCell straight off.
Even the CPSR algorithm is the same, just written differently.

Can you make a hexdump of the PrimeCell ID registers at offset
base+0xffe0..0xffff and post the contents?

Yours,
Linus Walleij