[spi-devel-general] [PATCH v6 1/2] spi: implemented driver for Cirrus EP93xx SPI controller
Linus Walleij
linus.ml.walleij at gmail.com
Sun May 2 20:18:44 EDT 2010
2010/5/2 Mika Westerberg <mika.westerberg at 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
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