Adding new fields to struct spi_slave and struct spi_flash is painful, because most drivers don't zero the fields they don't use. Anyway it seems better to have the SPI/SPI flash infrastructure provide a simple way of doing this that all drivers can use.
So the first part of this series adds spi_alloc_slave(), for SPI, and spi_flash_alloc() for SPI flash.
Support is added for the Intel ICH SPI controller, possibly the oddest SPI controller in U-Boot. It is designed for use with SPI flash only, and has a number of high-level features which are dedicated to flash. As such it is a bit of a challenge to get it to behave just like a normal U-Boot SPI device.
The ICH driver has two interesting features. Firstly it is impossible to read or write more than 64 bytes at a time! For SPI reading it is possible to hide this within the SPI driver. For SPI writing it unfortunately isn't, since the spi_flash layer has to send an unlock command and a new address for every write. It would be an egregious hack to try to fake this in the driver. So a new property is added to spi_flash to allow the maximum transfer size to be set.
Secondly, the ICH SPI flash can be memory mapped. On a lot of x86 devices this improves performance significantly. For example, the standard driver gets maybe 12Mbps throughput from a 33Mbps dual interface, roughly 20% utilisation. With memory mapping, many platforms can achieve about 40Mbps. To implement memory mapping, a new property is provided in the device tree to set the memory map address, which varies by platform. Some x86 platforms will see a speed increase with memory mapping, some won't. The memory mapping feature only works for reading. When in use, the spi_flash layer bypasses the SPI driver completely, and just copies the flash data from the correct place in the memory map.
Simon Glass (15): fdt: Use sed instead of cpp to pre-process the dtc fdt: Add fdtdec_get_addr_size() to read reg properties spi: Add function to allocate a new SPI slave spi: Use spi_alloc_slave() in each SPI driver sf: Add spi_flash_alloc() to create a new SPI flash struct sf: Use spi_flash_alloc() in each SPI flash driver x86: spi: Add Intel ICH driver spi: Add parameter for maximum write size sf: Respect maximum SPI write size x86: spi: Set maximum write size for ICH sf: Enable FDT-based configuration and memory mapping x86: Move PCI init before SPI init x86: Add FDT SPI node for link x86: Enable SPI flash support for coreboot x86: Enable time command for coreboot
arch/x86/lib/board.c | 8 +- board/chromebook-x86/dts/link.dts | 11 + drivers/mtd/spi/atmel.c | 8 +- drivers/mtd/spi/eon.c | 8 +- drivers/mtd/spi/macronix.c | 8 +- drivers/mtd/spi/ramtron.c | 4 +- drivers/mtd/spi/spansion.c | 8 +- drivers/mtd/spi/spi_flash.c | 81 ++++- drivers/mtd/spi/sst.c | 8 +- drivers/mtd/spi/stmicro.c | 8 +- drivers/mtd/spi/winbond.c | 8 +- drivers/spi/Makefile | 4 + drivers/spi/altera_spi.c | 4 +- drivers/spi/andes_spi.c | 4 +- drivers/spi/armada100_spi.c | 4 +- drivers/spi/atmel_spi.c | 4 +- drivers/spi/bfin_spi.c | 4 +- drivers/spi/cf_qspi.c | 4 +- drivers/spi/cf_spi.c | 4 +- drivers/spi/davinci_spi.c | 4 +- drivers/spi/fsl_espi.c | 4 +- drivers/spi/ich.c | 752 +++++++++++++++++++++++++++++++++++++ drivers/spi/ich.h | 144 +++++++ drivers/spi/kirkwood_spi.c | 5 +- drivers/spi/mpc52xx_spi.c | 5 +- drivers/spi/mpc8xxx_spi.c | 5 +- drivers/spi/mxc_spi.c | 4 +- drivers/spi/mxs_spi.c | 4 +- drivers/spi/oc_tiny_spi.c | 5 +- drivers/spi/omap3_spi.c | 27 +- drivers/spi/sh_spi.c | 4 +- drivers/spi/soft_spi.c | 4 +- drivers/spi/spi.c | 39 ++ drivers/spi/tegra_spi.c | 4 +- drivers/spi/xilinx_spi.c | 4 +- dts/Makefile | 10 +- include/configs/coreboot.h | 13 +- include/fdtdec.h | 16 + include/spi.h | 44 +++ include/spi_flash.h | 39 ++ lib/fdtdec.c | 27 ++- 41 files changed, 1208 insertions(+), 147 deletions(-) create mode 100644 drivers/spi/ich.c create mode 100644 drivers/spi/ich.h create mode 100644 drivers/spi/spi.c