Re: [RESEND][PATCH] SPI: xilinx_spi: Added platform driver and support for DS570
flat view
From: Andrew Morton <akpm@linux-foundation.org>
Date: 2009-06-23 05:05:11
Also in:
linux-spi, lkml
This appears to be a ppc thing, so let's cc that list. Let's also cc the driver's author and other contributors. Please cc these people on future versions of the patch also. On Mon, 15 Jun 2009 17:17:54 +0200 Richard R__jfors [off-list ref] wrote:
This patch splits xilinx_spi into three parts, an OF and a platform driver and generic part. The generic part now also works on X86 and also supports the Xilinx SPI IP DS570 ... +#ifndef CONFIG_PPC +#define in_8(addr) ioread8(addr) +#define in_be16(addr) ioread16(addr) +#define in_be32(addr) ioread32(addr) + +#define out_8(addr, b) iowrite8(b, addr) +#define out_be16(addr, w) iowrite16(w, addr) +#define out_be32(addr, l) iowrite32(l, addr) +#endif
Why do we need these?
quoted hunk
+#define XSPI_WRITE8(xspi, offs, val) \ + do { \ + if (xspi->model == XILINX_SPI_MODEL_DS464) \ + out_8(xspi->regs + offs, (val) & 0xff); \ + else \ + XSPI_WRITE32(xspi, offs, val); \ + } while (0) + +#define XSPI_WRITE16(xspi, offs, val) \ + do { \ + if (xspi->model == XILINX_SPI_MODEL_DS464) \ + out_be16(xspi->regs + offs, (val) & 0xffff); \ + else \ + XSPI_WRITE32(xspi, offs, val); \ + } while (0) + +#define XSPI_WRITE32(xspi, offs, val) \ + out_be32(xspi->regs + offs, val) + +#define XSPI_READ8(xspi, offs) \ + (xspi->model == XILINX_SPI_MODEL_DS464) ? \ + in_8(xspi->regs + offs) : XSPI_READ32(xspi, offs) + +#define XSPI_READ16(xspi, offs) \ + (xspi->model == XILINX_SPI_MODEL_DS464) ? \ + in_be16(xspi->regs + offs) : XSPI_READ32(xspi, offs) + +#define XSPI_READ32(xspi, offs) \ + in_be32(xspi->regs + offs)
I'm seeing no reason why these had to be implemented as macros. They're ugly, add considerable code bloat and, because they evaluate their args multiple times they will fail if passed as expression with side-effects. I suggest that they be reimplemented as lower-case, uninlined C functions.