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349 lines
10 KiB
Diff
349 lines
10 KiB
Diff
From 06d1fce502f478f7e554c591a68cd42cc861e976 Mon Sep 17 00:00:00 2001
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From: Luke Wren <wren6991@gmail.com>
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Date: Sat, 5 Sep 2015 01:16:10 +0100
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Subject: [PATCH 051/806] Add SMI NAND driver
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Signed-off-by: Luke Wren <wren6991@gmail.com>
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---
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.../bindings/mtd/brcm,bcm2835-smi-nand.txt | 42 +++
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drivers/mtd/nand/raw/Kconfig | 7 +
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drivers/mtd/nand/raw/Makefile | 1 +
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drivers/mtd/nand/raw/bcm2835_smi_nand.c | 258 ++++++++++++++++++
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4 files changed, 308 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/mtd/brcm,bcm2835-smi-nand.txt
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create mode 100644 drivers/mtd/nand/raw/bcm2835_smi_nand.c
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/mtd/brcm,bcm2835-smi-nand.txt
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@@ -0,0 +1,42 @@
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+* BCM2835 SMI NAND flash
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+
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+This driver is a shim between the BCM2835 SMI driver (SMI is a peripheral for
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+talking to parallel register interfaces) and Linux's MTD layer.
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+
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+Required properties:
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+- compatible: "brcm,bcm2835-smi-nand"
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+- status: "okay"
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+
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+Optional properties:
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+- partition@n, where n is an integer from a consecutive sequence starting at 0
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+ - Difficult to store partition table on NAND device - normally put it
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+ in the source code, kernel bootparams, or device tree (the best way!)
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+ - Sub-properties:
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+ - label: the partition name, as shown by mtdinfo /dev/mtd*
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+ - reg: the size and offset of this partition.
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+ - (optional) read-only: an empty property flagging as read only
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+
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+Example:
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+
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+nand: flash@0 {
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+ compatible = "brcm,bcm2835-smi-nand";
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+ status = "okay";
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+
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+ partition@0 {
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+ label = "stage2";
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+ // 128k
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+ reg = <0 0x20000>;
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+ read-only;
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+ };
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+ partition@1 {
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+ label = "firmware";
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+ // 16M
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+ reg = <0x20000 0x1000000>;
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+ read-only;
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+ };
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+ partition@2 {
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+ label = "root";
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+ // 2G
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+ reg = <0x1020000 0x80000000>;
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+ };
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+};
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\ No newline at end of file
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--- a/drivers/mtd/nand/raw/Kconfig
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+++ b/drivers/mtd/nand/raw/Kconfig
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@@ -40,6 +40,13 @@ config MTD_SM_COMMON
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tristate
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default n
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+config MTD_NAND_BCM2835_SMI
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+ tristate "Use Broadcom's Secondary Memory Interface as a NAND controller (BCM283x)"
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+ depends on BCM2835_SMI
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+ default m
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+ help
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+ Uses the BCM2835's SMI peripheral as a NAND controller.
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+
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config MTD_NAND_DENALI
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tristate
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--- a/drivers/mtd/nand/raw/Makefile
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+++ b/drivers/mtd/nand/raw/Makefile
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@@ -11,6 +11,7 @@ obj-$(CONFIG_MTD_NAND_DENALI) += denali
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obj-$(CONFIG_MTD_NAND_DENALI_PCI) += denali_pci.o
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obj-$(CONFIG_MTD_NAND_DENALI_DT) += denali_dt.o
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obj-$(CONFIG_MTD_NAND_AU1550) += au1550nd.o
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+obj-$(CONFIG_MTD_NAND_BCM2835_SMI) += bcm2835_smi_nand.o
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obj-$(CONFIG_MTD_NAND_S3C2410) += s3c2410.o
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obj-$(CONFIG_MTD_NAND_TANGO) += tango_nand.o
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obj-$(CONFIG_MTD_NAND_DAVINCI) += davinci_nand.o
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--- /dev/null
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+++ b/drivers/mtd/nand/raw/bcm2835_smi_nand.c
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@@ -0,0 +1,258 @@
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+/**
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+ * NAND flash driver for Broadcom Secondary Memory Interface
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+ *
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+ * Written by Luke Wren <luke@raspberrypi.org>
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+ * Copyright (c) 2015, Raspberry Pi (Trading) Ltd.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions, and the following disclaimer,
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+ * without modification.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * 3. The names of the above-listed copyright holders may not be used
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+ * to endorse or promote products derived from this software without
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+ * specific prior written permission.
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+ *
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+ * ALTERNATIVELY, this software may be distributed under the terms of the
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+ * GNU General Public License ("GPL") version 2, as published by the Free
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+ * Software Foundation.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/platform_device.h>
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+#include <linux/slab.h>
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+#include <linux/mtd/rawnand.h>
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+#include <linux/mtd/partitions.h>
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+
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+#include <linux/broadcom/bcm2835_smi.h>
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+
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+#define DEVICE_NAME "bcm2835-smi-nand"
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+#define DRIVER_NAME "smi-nand-bcm2835"
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+
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+struct bcm2835_smi_nand_host {
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+ struct bcm2835_smi_instance *smi_inst;
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+ struct nand_chip nand_chip;
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+ struct mtd_info mtd;
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+ struct device *dev;
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+};
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+
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+/****************************************************************************
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+*
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+* NAND functionality implementation
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+*
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+****************************************************************************/
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+
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+#define SMI_NAND_CLE_PIN 0x01
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+#define SMI_NAND_ALE_PIN 0x02
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+
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+static inline void bcm2835_smi_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
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+ unsigned int ctrl)
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+{
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+ uint32_t cmd32 = cmd;
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+ uint32_t addr = ~(SMI_NAND_CLE_PIN | SMI_NAND_ALE_PIN);
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+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
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+ struct bcm2835_smi_instance *inst = host->smi_inst;
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+
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+ if (ctrl & NAND_CLE)
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+ addr |= SMI_NAND_CLE_PIN;
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+ if (ctrl & NAND_ALE)
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+ addr |= SMI_NAND_ALE_PIN;
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+ /* Lower ALL the CS pins! */
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+ if (ctrl & NAND_NCE)
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+ addr &= (SMI_NAND_CLE_PIN | SMI_NAND_ALE_PIN);
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+
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+ bcm2835_smi_set_address(inst, addr);
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+
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+ if (cmd != NAND_CMD_NONE)
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+ bcm2835_smi_write_buf(inst, &cmd32, 1);
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+}
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+
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+static inline uint8_t bcm2835_smi_nand_read_byte(struct mtd_info *mtd)
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+{
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+ uint8_t byte;
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+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
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+ struct bcm2835_smi_instance *inst = host->smi_inst;
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+
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+ bcm2835_smi_read_buf(inst, &byte, 1);
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+ return byte;
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+}
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+
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+static inline void bcm2835_smi_nand_write_byte(struct mtd_info *mtd,
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+ uint8_t byte)
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+{
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+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
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+ struct bcm2835_smi_instance *inst = host->smi_inst;
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+
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+ bcm2835_smi_write_buf(inst, &byte, 1);
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+}
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+
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+static inline void bcm2835_smi_nand_write_buf(struct mtd_info *mtd,
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+ const uint8_t *buf, int len)
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+{
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+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
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+ struct bcm2835_smi_instance *inst = host->smi_inst;
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+
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+ bcm2835_smi_write_buf(inst, buf, len);
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+}
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+
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+static inline void bcm2835_smi_nand_read_buf(struct mtd_info *mtd,
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+ uint8_t *buf, int len)
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+{
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+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
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+ struct bcm2835_smi_instance *inst = host->smi_inst;
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+
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+ bcm2835_smi_read_buf(inst, buf, len);
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+}
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+
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+/****************************************************************************
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+*
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+* Probe and remove functions
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+*
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+***************************************************************************/
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+
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+static int bcm2835_smi_nand_probe(struct platform_device *pdev)
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+{
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+ struct bcm2835_smi_nand_host *host;
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+ struct nand_chip *this;
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+ struct mtd_info *mtd;
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+ struct device *dev = &pdev->dev;
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+ struct device_node *node = dev->of_node, *smi_node;
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+ struct mtd_part_parser_data ppdata;
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+ struct smi_settings *smi_settings;
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+ struct bcm2835_smi_instance *smi_inst;
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+ int ret = -ENXIO;
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+
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+ if (!node) {
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+ dev_err(dev, "No device tree node supplied!");
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+ return -EINVAL;
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+ }
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+
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+ smi_node = of_parse_phandle(node, "smi_handle", 0);
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+
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+ /* Request use of SMI peripheral: */
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+ smi_inst = bcm2835_smi_get(smi_node);
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+
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+ if (!smi_inst) {
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+ dev_err(dev, "Could not register with SMI.");
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+ return -EPROBE_DEFER;
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+ }
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+
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+ /* Set SMI timing and bus width */
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+
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+ smi_settings = bcm2835_smi_get_settings_from_regs(smi_inst);
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+
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+ smi_settings->data_width = SMI_WIDTH_8BIT;
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+ smi_settings->read_setup_time = 2;
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+ smi_settings->read_hold_time = 1;
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+ smi_settings->read_pace_time = 1;
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+ smi_settings->read_strobe_time = 3;
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+
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+ smi_settings->write_setup_time = 2;
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+ smi_settings->write_hold_time = 1;
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+ smi_settings->write_pace_time = 1;
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+ smi_settings->write_strobe_time = 3;
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+
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+ bcm2835_smi_set_regs_from_settings(smi_inst);
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+
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+ host = devm_kzalloc(dev, sizeof(struct bcm2835_smi_nand_host),
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+ GFP_KERNEL);
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+ if (!host)
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+ return -ENOMEM;
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+
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+ host->dev = dev;
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+ host->smi_inst = smi_inst;
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+
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+ platform_set_drvdata(pdev, host);
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+
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+ /* Link the structures together */
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+
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+ this = &host->nand_chip;
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+ mtd = &host->mtd;
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+ mtd->priv = this;
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+ mtd->owner = THIS_MODULE;
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+ mtd->dev.parent = dev;
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+ mtd->name = DRIVER_NAME;
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+
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+ /* 20 us command delay time... */
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+ this->chip_delay = 20;
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+
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+ this->priv = host;
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+ this->cmd_ctrl = bcm2835_smi_nand_cmd_ctrl;
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+ this->read_byte = bcm2835_smi_nand_read_byte;
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+ this->write_byte = bcm2835_smi_nand_write_byte;
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+ this->write_buf = bcm2835_smi_nand_write_buf;
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+ this->read_buf = bcm2835_smi_nand_read_buf;
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+
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+ this->ecc.mode = NAND_ECC_SOFT;
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+
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+ /* Should never be accessed directly: */
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+
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+ this->IO_ADDR_R = (void *)0xdeadbeef;
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+ this->IO_ADDR_W = (void *)0xdeadbeef;
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+
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+ /* Scan to find the device and get the page size */
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+
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+ if (nand_scan(mtd, 1))
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+ return -ENXIO;
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+
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+ nand_release(mtd);
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+ return -EINVAL;
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+}
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+
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+static int bcm2835_smi_nand_remove(struct platform_device *pdev)
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+{
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+ struct bcm2835_smi_nand_host *host = platform_get_drvdata(pdev);
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+
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+ nand_release(&host->mtd);
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+
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+ return 0;
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+}
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+
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+/****************************************************************************
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+*
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+* Register the driver with device tree
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+*
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+***************************************************************************/
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+
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+static const struct of_device_id bcm2835_smi_nand_of_match[] = {
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+ {.compatible = "brcm,bcm2835-smi-nand",},
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+ { /* sentinel */ }
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+};
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+
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+MODULE_DEVICE_TABLE(of, bcm2835_smi_nand_of_match);
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+
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+static struct platform_driver bcm2835_smi_nand_driver = {
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+ .probe = bcm2835_smi_nand_probe,
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+ .remove = bcm2835_smi_nand_remove,
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+ .driver = {
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+ .name = DRIVER_NAME,
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+ .owner = THIS_MODULE,
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+ .of_match_table = bcm2835_smi_nand_of_match,
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+ },
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+};
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+
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+module_platform_driver(bcm2835_smi_nand_driver);
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+
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+MODULE_ALIAS("platform:smi-nand-bcm2835");
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+MODULE_LICENSE("GPL");
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+MODULE_DESCRIPTION
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+ ("Driver for NAND chips using Broadcom Secondary Memory Interface");
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+MODULE_AUTHOR("Luke Wren <luke@raspberrypi.org>");
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