302 lines
8.2 KiB
Diff
302 lines
8.2 KiB
Diff
From cd0d53b24ca744295d2cdf69bb2b659571091b75 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Tue, 12 Apr 2011 18:10:01 +0200
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Subject: [PATCH 04/13] MIPS: Lantiq: Add NOR flash support
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This patch adds the driver/map for NOR devices attached to the SoC via the
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External Bus Unit (EBU).
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Signed-off-by: John Crispin <blogic@openwrt.org>
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Signed-off-by: Ralph Hempel <ralph.hempel@lantiq.com>
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Cc: David Woodhouse <dwmw2@infradead.org>
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Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
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Cc: linux-mips@linux-mips.org
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Cc: linux-mtd@lists.infradead.org
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Acked-by: Artem Bityutskiy <dedekind1@gmail.com>
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Patchwork: https://patchwork.linux-mips.org/patch/2285/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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drivers/mtd/maps/Kconfig | 7 +
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drivers/mtd/maps/Makefile | 1 +
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drivers/mtd/maps/lantiq-flash.c | 251 +++++++++++++++++++++++++++++++++++++++
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3 files changed, 259 insertions(+), 0 deletions(-)
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create mode 100644 drivers/mtd/maps/lantiq-flash.c
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--- a/drivers/mtd/maps/Kconfig
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+++ b/drivers/mtd/maps/Kconfig
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@@ -259,6 +259,13 @@
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help
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Flash memory access on AMD Alchemy Pb/Db/RDK Reference Boards
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+config MTD_LANTIQ
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+ tristate "Lantiq SoC NOR support"
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+ depends on LANTIQ
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+ select MTD_PARTITIONS
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+ help
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+ Support for NOR flash attached to the Lantiq SoC's External Bus Unit.
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+
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config MTD_DILNETPC
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tristate "CFI Flash device mapped on DIL/Net PC"
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depends on X86 && MTD_CONCAT && MTD_PARTITIONS && MTD_CFI_INTELEXT && BROKEN
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--- a/drivers/mtd/maps/Makefile
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+++ b/drivers/mtd/maps/Makefile
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@@ -61,3 +61,4 @@
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obj-$(CONFIG_MTD_RBTX4939) += rbtx4939-flash.o
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obj-$(CONFIG_MTD_VMU) += vmu-flash.o
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obj-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr-flash.o
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+obj-$(CONFIG_MTD_LANTIQ) += lantiq-flash.o
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--- /dev/null
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+++ b/drivers/mtd/maps/lantiq-flash.c
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@@ -0,0 +1,251 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
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+ * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/types.h>
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+#include <linux/kernel.h>
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+#include <linux/io.h>
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+#include <linux/slab.h>
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+#include <linux/init.h>
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+#include <linux/mtd/mtd.h>
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+#include <linux/mtd/map.h>
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+#include <linux/mtd/partitions.h>
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+#include <linux/mtd/cfi.h>
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+#include <linux/platform_device.h>
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+#include <linux/mtd/physmap.h>
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+
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+#include <lantiq_soc.h>
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+#include <lantiq_platform.h>
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+
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+/*
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+ * The NOR flash is connected to the same external bus unit (EBU) as PCI.
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+ * To make PCI work we need to enable the endianness swapping for the address
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+ * written to the EBU. This endianness swapping works for PCI correctly but
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+ * fails for attached NOR devices. To workaround this we need to use a complex
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+ * map. The workaround involves swapping all addresses whilst probing the chip.
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+ * Once probing is complete we stop swapping the addresses but swizzle the
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+ * unlock addresses to ensure that access to the NOR device works correctly.
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+ */
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+
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+enum {
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+ LTQ_NOR_PROBING,
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+ LTQ_NOR_NORMAL
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+};
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+
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+struct ltq_mtd {
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+ struct resource *res;
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+ struct mtd_info *mtd;
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+ struct map_info *map;
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+};
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+
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+static char ltq_map_name[] = "ltq_nor";
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+
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+static map_word
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+ltq_read16(struct map_info *map, unsigned long adr)
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+{
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+ unsigned long flags;
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+ map_word temp;
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+
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+ if (map->map_priv_1 == LTQ_NOR_PROBING)
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+ adr ^= 2;
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+ spin_lock_irqsave(&ebu_lock, flags);
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+ temp.x[0] = *(u16 *)(map->virt + adr);
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+ spin_unlock_irqrestore(&ebu_lock, flags);
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+ return temp;
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+}
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+
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+static void
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+ltq_write16(struct map_info *map, map_word d, unsigned long adr)
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+{
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+ unsigned long flags;
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+
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+ if (map->map_priv_1 == LTQ_NOR_PROBING)
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+ adr ^= 2;
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+ spin_lock_irqsave(&ebu_lock, flags);
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+ *(u16 *)(map->virt + adr) = d.x[0];
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+ spin_unlock_irqrestore(&ebu_lock, flags);
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+}
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+
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+/*
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+ * The following 2 functions copy data between iomem and a cached memory
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+ * section. As memcpy() makes use of pre-fetching we cannot use it here.
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+ * The normal alternative of using memcpy_{to,from}io also makes use of
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+ * memcpy() on MIPS so it is not applicable either. We are therefore stuck
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+ * with having to use our own loop.
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+ */
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+static void
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+ltq_copy_from(struct map_info *map, void *to,
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+ unsigned long from, ssize_t len)
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+{
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+ unsigned char *f = (unsigned char *)map->virt + from;
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+ unsigned char *t = (unsigned char *)to;
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&ebu_lock, flags);
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+ while (len--)
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+ *t++ = *f++;
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+ spin_unlock_irqrestore(&ebu_lock, flags);
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+}
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+
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+static void
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+ltq_copy_to(struct map_info *map, unsigned long to,
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+ const void *from, ssize_t len)
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+{
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+ unsigned char *f = (unsigned char *)from;
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+ unsigned char *t = (unsigned char *)map->virt + to;
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&ebu_lock, flags);
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+ while (len--)
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+ *t++ = *f++;
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+ spin_unlock_irqrestore(&ebu_lock, flags);
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+}
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+
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+static const char const *part_probe_types[] = { "cmdlinepart", NULL };
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+
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+static int __init
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+ltq_mtd_probe(struct platform_device *pdev)
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+{
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+ struct physmap_flash_data *ltq_mtd_data = dev_get_platdata(&pdev->dev);
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+ struct ltq_mtd *ltq_mtd;
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+ struct mtd_partition *parts;
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+ struct resource *res;
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+ int nr_parts = 0;
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+ struct cfi_private *cfi;
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+ int err;
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+
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+ ltq_mtd = kzalloc(sizeof(struct ltq_mtd), GFP_KERNEL);
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+ platform_set_drvdata(pdev, ltq_mtd);
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+
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+ ltq_mtd->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!ltq_mtd->res) {
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+ dev_err(&pdev->dev, "failed to get memory resource");
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+ err = -ENOENT;
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+ goto err_out;
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+ }
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+
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+ res = devm_request_mem_region(&pdev->dev, ltq_mtd->res->start,
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+ resource_size(ltq_mtd->res), dev_name(&pdev->dev));
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+ if (!ltq_mtd->res) {
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+ dev_err(&pdev->dev, "failed to request mem resource");
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+ err = -EBUSY;
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+ goto err_out;
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+ }
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+
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+ ltq_mtd->map = kzalloc(sizeof(struct map_info), GFP_KERNEL);
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+ ltq_mtd->map->phys = res->start;
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+ ltq_mtd->map->size = resource_size(res);
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+ ltq_mtd->map->virt = devm_ioremap_nocache(&pdev->dev,
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+ ltq_mtd->map->phys, ltq_mtd->map->size);
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+ if (!ltq_mtd->map->virt) {
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+ dev_err(&pdev->dev, "failed to ioremap!\n");
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+ err = -ENOMEM;
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+ goto err_free;
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+ }
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+
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+ ltq_mtd->map->name = ltq_map_name;
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+ ltq_mtd->map->bankwidth = 2;
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+ ltq_mtd->map->read = ltq_read16;
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+ ltq_mtd->map->write = ltq_write16;
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+ ltq_mtd->map->copy_from = ltq_copy_from;
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+ ltq_mtd->map->copy_to = ltq_copy_to;
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+
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+ ltq_mtd->map->map_priv_1 = LTQ_NOR_PROBING;
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+ ltq_mtd->mtd = do_map_probe("cfi_probe", ltq_mtd->map);
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+ ltq_mtd->map->map_priv_1 = LTQ_NOR_NORMAL;
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+
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+ if (!ltq_mtd->mtd) {
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+ dev_err(&pdev->dev, "probing failed\n");
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+ err = -ENXIO;
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+ goto err_unmap;
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+ }
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+
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+ ltq_mtd->mtd->owner = THIS_MODULE;
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+
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+ cfi = ltq_mtd->map->fldrv_priv;
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+ cfi->addr_unlock1 ^= 1;
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+ cfi->addr_unlock2 ^= 1;
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+
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+ nr_parts = parse_mtd_partitions(ltq_mtd->mtd,
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+ part_probe_types, &parts, 0);
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+ if (nr_parts > 0) {
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+ dev_info(&pdev->dev,
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+ "using %d partitions from cmdline", nr_parts);
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+ } else {
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+ nr_parts = ltq_mtd_data->nr_parts;
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+ parts = ltq_mtd_data->parts;
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+ }
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+
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+ err = add_mtd_partitions(ltq_mtd->mtd, parts, nr_parts);
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+ if (err) {
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+ dev_err(&pdev->dev, "failed to add partitions\n");
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+ goto err_destroy;
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+ }
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+
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+ return 0;
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+
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+err_destroy:
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+ map_destroy(ltq_mtd->mtd);
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+err_unmap:
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+ iounmap(ltq_mtd->map->virt);
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+err_free:
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+ kfree(ltq_mtd->map);
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+err_out:
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+ kfree(ltq_mtd);
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+ return err;
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+}
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+
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+static int __devexit
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+ltq_mtd_remove(struct platform_device *pdev)
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+{
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+ struct ltq_mtd *ltq_mtd = platform_get_drvdata(pdev);
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+
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+ if (ltq_mtd) {
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+ if (ltq_mtd->mtd) {
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+ del_mtd_partitions(ltq_mtd->mtd);
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+ map_destroy(ltq_mtd->mtd);
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+ }
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+ if (ltq_mtd->map->virt)
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+ iounmap(ltq_mtd->map->virt);
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+ kfree(ltq_mtd->map);
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+ kfree(ltq_mtd);
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+ }
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+ return 0;
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+}
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+
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+static struct platform_driver ltq_mtd_driver = {
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+ .remove = __devexit_p(ltq_mtd_remove),
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+ .driver = {
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+ .name = "ltq_nor",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init
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+init_ltq_mtd(void)
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+{
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+ int ret = platform_driver_probe(<q_mtd_driver, ltq_mtd_probe);
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+
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+ if (ret)
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+ pr_err("ltq_nor: error registering platform driver");
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+ return ret;
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+}
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+
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+static void __exit
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+exit_ltq_mtd(void)
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+{
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+ platform_driver_unregister(<q_mtd_driver);
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+}
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+
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+module_init(init_ltq_mtd);
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+module_exit(exit_ltq_mtd);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
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+MODULE_DESCRIPTION("Lantiq SoC NOR");
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