Root/target/linux/brcm47xx/patches-3.2/0018-mtd-bcm47xx-add-parallel-flash-driver.patch

1From 36f8b899174a445a98fe02ed8d1db177525f0c52 Mon Sep 17 00:00:00 2001
2From: Hauke Mehrtens <hauke@hauke-m.de>
3Date: Sun, 17 Jul 2011 14:55:18 +0200
4Subject: [PATCH 07/15] mtd: bcm47xx: add parallel flash driver
5
6
7Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
8---
9 drivers/mtd/maps/Kconfig | 9 ++
10 drivers/mtd/maps/Makefile | 1 +
11 drivers/mtd/maps/bcm47xx-pflash.c | 188 +++++++++++++++++++++++++++++++++++++
12 3 files changed, 198 insertions(+), 0 deletions(-)
13 create mode 100644 drivers/mtd/maps/bcm47xx-pflash.c
14
15--- a/drivers/mtd/maps/Kconfig
16+++ b/drivers/mtd/maps/Kconfig
17@@ -257,6 +257,15 @@ config MTD_LANTIQ
18     help
19       Support for NOR flash attached to the Lantiq SoC's External Bus Unit.
20 
21+config MTD_BCM47XX_PFLASH
22+ tristate "bcm47xx parallel flash support"
23+ default y
24+ depends on BCM47XX
25+ select MTD_PARTITIONS
26+ select MTD_BCM47XX_PARTS
27+ help
28+ Support for bcm47xx parallel flash
29+
30 config MTD_DILNETPC
31     tristate "CFI Flash device mapped on DIL/Net PC"
32     depends on X86 && MTD_CFI_INTELEXT && BROKEN
33--- a/drivers/mtd/maps/Makefile
34+++ b/drivers/mtd/maps/Makefile
35@@ -58,3 +58,4 @@ obj-$(CONFIG_MTD_GPIO_ADDR) += gpio-addr
36 obj-$(CONFIG_MTD_BCM963XX) += bcm963xx-flash.o
37 obj-$(CONFIG_MTD_LATCH_ADDR) += latch-addr-flash.o
38 obj-$(CONFIG_MTD_LANTIQ) += lantiq-flash.o
39+obj-$(CONFIG_MTD_BCM47XX_PFLASH)+= bcm47xx-pflash.o
40--- /dev/null
41+++ b/drivers/mtd/maps/bcm47xx-pflash.c
42@@ -0,0 +1,188 @@
43+/*
44+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
45+ * Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
46+ * Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
47+ *
48+ * original functions for finding root filesystem from Mike Baker
49+ *
50+ * This program is free software; you can redistribute it and/or modify it
51+ * under the terms of the GNU General Public License as published by the
52+ * Free Software Foundation; either version 2 of the License, or (at your
53+ * option) any later version.
54+ *
55+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
56+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
57+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
58+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
59+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
60+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
61+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
62+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
63+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
64+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
65+ *
66+ * You should have received a copy of the GNU General Public License along
67+ * with this program; if not, write to the Free Software Foundation, Inc.,
68+ * 675 Mass Ave, Cambridge, MA 02139, USA.
69+ *
70+ * Copyright 2001-2003, Broadcom Corporation
71+ * All Rights Reserved.
72+ *
73+ * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
74+ * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
75+ * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
76+ * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
77+ *
78+ * Flash mapping for BCM947XX boards
79+ */
80+
81+#define pr_fmt(fmt) "bcm47xx_pflash: " fmt
82+#include <linux/init.h>
83+#include <linux/module.h>
84+#include <linux/types.h>
85+#include <linux/kernel.h>
86+#include <linux/sched.h>
87+#include <linux/mtd/mtd.h>
88+#include <linux/mtd/map.h>
89+#include <linux/mtd/partitions.h>
90+#include <linux/io.h>
91+#include <asm/mach-bcm47xx/bcm47xx.h>
92+#include <linux/platform_device.h>
93+
94+#define WINDOW_ADDR 0x1fc00000
95+#define WINDOW_SIZE 0x400000
96+#define BUSWIDTH 2
97+
98+static struct mtd_info *bcm47xx_mtd;
99+
100+static void bcm47xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
101+{
102+ if (len == 1) {
103+ memcpy_fromio(to, map->virt + from, len);
104+ } else {
105+ int i;
106+ u16 *dest = (u16 *) to;
107+ u16 *src = (u16 *) (map->virt + from);
108+ for (i = 0; i < (len / 2); i++)
109+ dest[i] = src[i];
110+ if (len & 1)
111+ *((u8 *)dest+len-1) = src[i] & 0xff;
112+ }
113+}
114+
115+static struct map_info bcm47xx_map = {
116+ name: "Physically mapped flash",
117+ size : WINDOW_SIZE,
118+ bankwidth : BUSWIDTH,
119+ phys : WINDOW_ADDR,
120+};
121+
122+static const char *probes[] = { "bcm47xx", NULL };
123+
124+static int bcm47xx_mtd_probe(struct platform_device *pdev)
125+{
126+#ifdef CONFIG_BCM47XX_SSB
127+ struct ssb_chipcommon *ssb_cc;
128+#endif
129+#ifdef CONFIG_BCM47XX_BCMA
130+ struct bcma_drv_cc *bcma_cc;
131+#endif
132+ int ret = 0;
133+
134+ switch (bcm47xx_bus_type) {
135+#ifdef CONFIG_BCM47XX_SSB
136+ case BCM47XX_BUS_TYPE_SSB:
137+ ssb_cc = &bcm47xx_bus.ssb.chipco;
138+ if (ssb_cc->flash_type != SSB_PFLASH)
139+ return -ENODEV;
140+
141+ bcm47xx_map.phys = ssb_cc->pflash.window;
142+ bcm47xx_map.size = ssb_cc->pflash.window_size;
143+ bcm47xx_map.bankwidth = ssb_cc->pflash.buswidth;
144+ break;
145+#endif
146+#ifdef CONFIG_BCM47XX_BCMA
147+ case BCM47XX_BUS_TYPE_BCMA:
148+ bcma_cc = &bcm47xx_bus.bcma.bus.drv_cc;
149+ if (bcma_cc->flash_type != BCMA_PFLASH)
150+ return -ENODEV;
151+
152+ bcm47xx_map.phys = bcma_cc->pflash.window;
153+ bcm47xx_map.size = bcma_cc->pflash.window_size;
154+ bcm47xx_map.bankwidth = bcma_cc->pflash.buswidth;
155+ break;
156+#endif
157+ }
158+
159+ pr_notice("flash init: 0x%08x 0x%08lx\n", bcm47xx_map.phys, bcm47xx_map.size);
160+ bcm47xx_map.virt = ioremap_nocache(bcm47xx_map.phys, bcm47xx_map.size);
161+
162+ if (!bcm47xx_map.virt) {
163+ pr_err("Failed to ioremap\n");
164+ return -EIO;
165+ }
166+
167+ simple_map_init(&bcm47xx_map);
168+ /* override copy_from routine */
169+ bcm47xx_map.copy_from = bcm47xx_map_copy_from;
170+
171+ bcm47xx_mtd = do_map_probe("cfi_probe", &bcm47xx_map);
172+ if (!bcm47xx_mtd) {
173+ pr_err("Failed to do_map_probe\n");
174+ ret = -ENXIO;
175+ goto err_unmap;
176+ }
177+ bcm47xx_mtd->owner = THIS_MODULE;
178+
179+ pr_notice("Flash device: 0x%lx at 0x%x\n", bcm47xx_map.size, WINDOW_ADDR);
180+
181+ ret = mtd_device_parse_register(bcm47xx_mtd, probes, NULL, NULL, 0);
182+
183+ if (ret) {
184+ pr_err("Flash: mtd_device_register failed\n");
185+ goto err_destroy;
186+ }
187+ return 0;
188+
189+err_destroy:
190+ map_destroy(bcm47xx_mtd);
191+err_unmap:
192+ iounmap(bcm47xx_map.virt);
193+ return ret;
194+}
195+
196+static int __devexit bcm47xx_mtd_remove(struct platform_device *pdev)
197+{
198+ mtd_device_unregister(bcm47xx_mtd);
199+ map_destroy(bcm47xx_mtd);
200+ iounmap(bcm47xx_map.virt);
201+ return 0;
202+}
203+
204+static struct platform_driver bcm47xx_mtd_driver = {
205+ .remove = __devexit_p(bcm47xx_mtd_remove),
206+ .driver = {
207+ .name = "bcm47xx_pflash",
208+ .owner = THIS_MODULE,
209+ },
210+};
211+
212+static int __init init_bcm47xx_mtd(void)
213+{
214+ int ret = platform_driver_probe(&bcm47xx_mtd_driver, bcm47xx_mtd_probe);
215+
216+ if (ret)
217+ pr_err("error registering platform driver: %i\n", ret);
218+ return ret;
219+}
220+
221+static void __exit exit_bcm47xx_mtd(void)
222+{
223+ platform_driver_unregister(&bcm47xx_mtd_driver);
224+}
225+
226+module_init(init_bcm47xx_mtd);
227+module_exit(exit_bcm47xx_mtd);
228+
229+MODULE_LICENSE("GPL");
230+MODULE_DESCRIPTION("BCM47XX parallel flash driver");
231

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