[PATCH v3 01/36] mtd: st_spi_fsm: Allocate resources and register with MTD framework

Lee Jones
2013-11-29T12:19:40Z

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.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
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"
+ 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 <angus.clark@st.com>
+ *
+ * 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>
+
+#include "st_spi_fsm.h"
+
+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;
+}
+
+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,
+ },
+};
+module_platform_driver(stfsm_driver);
+
+MODULE_AUTHOR("Angus Clark <angus.clark@st.com>");
+MODULE_DESCRIPTION("ST SPI FSM driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mtd/devices/st_spi_fsm.h b/drivers/mtd/devices/st_spi_fsm.h
new file mode 100644
index 0000000..df45e1a
--- /dev/null
+++ b/drivers/mtd/devices/st_spi_fsm.h
@@ -0,0 +1,27 @@
+/*
+ * st_spi_fsm.c Support for ST Serial Flash Controller
+ *
+ * Author: Angus Clark <angus.clark@st.com>
+ *
+ * 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.
+ *
+ */
+
+#ifndef ST_SPI_FSM_H
+#define ST_SPI_FSM_H
+
+struct stfsm {
+ struct device *dev;
+ void __iomem *base;
+ struct resource *region;
+ struct mtd_info mtd;
+ struct mutex lock;
+};
+
+#endif /* ST_SPI_FSM_H */
--
1.8.3.2