On 29/11/13 12:18, Lee Jones wrote: > This is a new driver. It's used to communicate with a special type of > optimised Serial Flash Controller called the FSM. The FSM uses a subset > of the SPI protocol to communicate with supported NOR-Flash devices. > You might want to expand what is FSM here..(Fast sequence mode). > Signed-off-by: Lee Jones <[email protected]> > --- > drivers/mtd/devices/Kconfig | 7 +++ > drivers/mtd/devices/Makefile | 1 + > drivers/mtd/devices/st_spi_fsm.c | 111 > +++++++++++++++++++++++++++++++++++++++ > drivers/mtd/devices/st_spi_fsm.h | 27 ++++++++++ > 4 files changed, 146 insertions(+) > create mode 100644 drivers/mtd/devices/st_spi_fsm.c > create mode 100644 drivers/mtd/devices/st_spi_fsm.h > > diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig > index 74ab4b7..d977281 100644 > --- a/drivers/mtd/devices/Kconfig > +++ b/drivers/mtd/devices/Kconfig > @@ -217,6 +217,13 @@ config MTD_DOCG3 > M-Systems and now Sandisk. The support is very experimental, > and doesn't give access to any write operations. > > +config MTD_ST_SPI_FSM > + tristate "ST Microelectronics SPI FSM Serial Flash Controller"
I think this should depend on ARCH_STI, so that it is not build for x86 or any other platforms. > + help > + This provides an MTD device driver for the ST Microelectronics > + SPI FSM Serial Flash Controller and support for a subset of > + connected Serial Flash devices. > + > if MTD_DOCG3 > config BCH_CONST_M > default 14 > diff --git a/drivers/mtd/devices/Makefile b/drivers/mtd/devices/Makefile > index d83bd73..c68868f 100644 > --- a/drivers/mtd/devices/Makefile > +++ b/drivers/mtd/devices/Makefile > @@ -16,6 +16,7 @@ obj-$(CONFIG_MTD_NAND_OMAP_BCH) += elm.o > obj-$(CONFIG_MTD_SPEAR_SMI) += spear_smi.o > obj-$(CONFIG_MTD_SST25L) += sst25l.o > obj-$(CONFIG_MTD_BCM47XXSFLASH) += bcm47xxsflash.o > +obj-$(CONFIG_MTD_ST_SPI_FSM) += st_spi_fsm.o > > > CFLAGS_docg3.o += -I$(src) > diff --git a/drivers/mtd/devices/st_spi_fsm.c > b/drivers/mtd/devices/st_spi_fsm.c > new file mode 100644 > index 0000000..1e3abde > --- /dev/null > +++ b/drivers/mtd/devices/st_spi_fsm.c > @@ -0,0 +1,111 @@ > +/* > + * st_spi_fsm.c Support for ST Serial Flash Controller > + * > + * Author: Angus Clark <[email protected]> > + * > + * Copyright (C) 2010-2013 STicroelectronics Limited > + * > + * JEDEC probe based on drivers/mtd/devices/m25p80.c > + * > + * This code 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 <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/mtd/mtd.h> > +#include <linux/sched.h> > +#include <linux/delay.h> > +#include <linux/io.h> > +#include <linux/of.h> > + > +#include <asm/io.h> Are you sure about including this? > + > +#include "st_spi_fsm.h" Header file can be removed totally, as this is the only file which is using it. > + > +static int stfsm_probe(struct platform_device *pdev) > +{ > + struct device_node *np = pdev->dev.of_node; > + struct resource *res; > + struct stfsm *fsm; > + > + if (!np) { > + dev_err(&pdev->dev, "No DT found\n"); > + return -EINVAL; > + } > + > + fsm = devm_kzalloc(&pdev->dev, sizeof(*fsm), GFP_KERNEL); > + if (!fsm) > + return -ENOMEM; > + > + fsm->dev = &pdev->dev; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!res) { > + dev_err(&pdev->dev, "Resource not found\n"); > + return -ENODEV; > + } > + > + fsm->region = devm_request_mem_region(&pdev->dev, res->start, > + resource_size(res), pdev->name); > + if (!fsm->region) { > + dev_err(&pdev->dev, > + "Failed to reserve memory region [0x%08x-0x%08x]\n", > + res->start, res->end); > + return -EBUSY; > + } > + > + fsm->base = devm_ioremap_nocache(&pdev->dev, > + res->start, resource_size(res)); > + if (!fsm->base) { > + dev_err(&pdev->dev, "Failed to ioremap [0x%08x]\n", res->start); > + return -EINVAL; > + } > + > + mutex_init(&fsm->lock); > + > + platform_set_drvdata(pdev, fsm); > + > + fsm->mtd.dev.parent = &pdev->dev; > + fsm->mtd.type = MTD_NORFLASH; > + fsm->mtd.writesize = 4; > + fsm->mtd.writebufsize = fsm->mtd.writesize; > + fsm->mtd.flags = MTD_CAP_NORFLASH; > + > + return mtd_device_parse_register(&fsm->mtd, NULL, NULL, NULL, 0); > +} > + > +static int stfsm_remove(struct platform_device *pdev) > +{ > + struct stfsm *fsm = platform_get_drvdata(pdev); > + int err; > + > + err = mtd_device_unregister(&fsm->mtd); > + if (err) > + return err; > + > + return 0; > +} > +Any reason not to use of_match_ptr macro here? Thanks, srini > +static struct of_device_id stfsm_match[] = { > + { .compatible = "st,spi-fsm", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, spi_fsm_match); > + > +static struct platform_driver stfsm_driver = { > + .probe = stfsm_probe, > + .remove = stfsm_remove, > + .driver = { > + .name = "st-spi-fsm", > + .owner = THIS_MODULE, > + .of_match_table = stfsm_match, Any reason not to use of_match_ptr macro here? Thanks, srini -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
