1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Cobalt NOR flash functions
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2012-2015 Cisco Systems, Inc. and/or its affiliates.
6*4882a593Smuzhiyun * All rights reserved.
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/mtd/mtd.h>
10*4882a593Smuzhiyun #include <linux/mtd/map.h>
11*4882a593Smuzhiyun #include <linux/mtd/cfi.h>
12*4882a593Smuzhiyun #include <linux/time.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "cobalt-flash.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define ADRS(offset) (COBALT_BUS_FLASH_BASE + offset)
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun static struct map_info cobalt_flash_map = {
19*4882a593Smuzhiyun .name = "cobalt-flash",
20*4882a593Smuzhiyun .bankwidth = 2, /* 16 bits */
21*4882a593Smuzhiyun .size = 0x4000000, /* 64MB */
22*4882a593Smuzhiyun .phys = 0, /* offset */
23*4882a593Smuzhiyun };
24*4882a593Smuzhiyun
flash_read16(struct map_info * map,unsigned long offset)25*4882a593Smuzhiyun static map_word flash_read16(struct map_info *map, unsigned long offset)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun map_word r;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun r.x[0] = cobalt_bus_read32(map->virt, ADRS(offset));
30*4882a593Smuzhiyun if (offset & 0x2)
31*4882a593Smuzhiyun r.x[0] >>= 16;
32*4882a593Smuzhiyun else
33*4882a593Smuzhiyun r.x[0] &= 0x0000ffff;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return r;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
flash_write16(struct map_info * map,const map_word datum,unsigned long offset)38*4882a593Smuzhiyun static void flash_write16(struct map_info *map, const map_word datum,
39*4882a593Smuzhiyun unsigned long offset)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun u16 data = (u16)datum.x[0];
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun cobalt_bus_write16(map->virt, ADRS(offset), data);
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
flash_copy_from(struct map_info * map,void * to,unsigned long from,ssize_t len)46*4882a593Smuzhiyun static void flash_copy_from(struct map_info *map, void *to,
47*4882a593Smuzhiyun unsigned long from, ssize_t len)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun u32 src = from;
50*4882a593Smuzhiyun u8 *dest = to;
51*4882a593Smuzhiyun u32 data;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun while (len) {
54*4882a593Smuzhiyun data = cobalt_bus_read32(map->virt, ADRS(src));
55*4882a593Smuzhiyun do {
56*4882a593Smuzhiyun *dest = data >> (8 * (src & 3));
57*4882a593Smuzhiyun src++;
58*4882a593Smuzhiyun dest++;
59*4882a593Smuzhiyun len--;
60*4882a593Smuzhiyun } while (len && (src % 4));
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
flash_copy_to(struct map_info * map,unsigned long to,const void * from,ssize_t len)64*4882a593Smuzhiyun static void flash_copy_to(struct map_info *map, unsigned long to,
65*4882a593Smuzhiyun const void *from, ssize_t len)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun const u8 *src = from;
68*4882a593Smuzhiyun u32 dest = to;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun pr_info("%s: offset 0x%x: length %zu\n", __func__, dest, len);
71*4882a593Smuzhiyun while (len) {
72*4882a593Smuzhiyun u16 data;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun do {
75*4882a593Smuzhiyun data = *src << (8 * (dest & 1));
76*4882a593Smuzhiyun src++;
77*4882a593Smuzhiyun dest++;
78*4882a593Smuzhiyun len--;
79*4882a593Smuzhiyun } while (len && (dest % 2));
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun cobalt_bus_write16(map->virt, ADRS(dest - 2), data);
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
cobalt_flash_probe(struct cobalt * cobalt)85*4882a593Smuzhiyun int cobalt_flash_probe(struct cobalt *cobalt)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun struct map_info *map = &cobalt_flash_map;
88*4882a593Smuzhiyun struct mtd_info *mtd;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun BUG_ON(!map_bankwidth_supported(map->bankwidth));
91*4882a593Smuzhiyun map->virt = cobalt->bar1;
92*4882a593Smuzhiyun map->read = flash_read16;
93*4882a593Smuzhiyun map->write = flash_write16;
94*4882a593Smuzhiyun map->copy_from = flash_copy_from;
95*4882a593Smuzhiyun map->copy_to = flash_copy_to;
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun mtd = do_map_probe("cfi_probe", map);
98*4882a593Smuzhiyun cobalt->mtd = mtd;
99*4882a593Smuzhiyun if (!mtd) {
100*4882a593Smuzhiyun cobalt_err("Probe CFI flash failed!\n");
101*4882a593Smuzhiyun return -1;
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun mtd->owner = THIS_MODULE;
105*4882a593Smuzhiyun mtd->dev.parent = &cobalt->pci_dev->dev;
106*4882a593Smuzhiyun mtd_device_register(mtd, NULL, 0);
107*4882a593Smuzhiyun return 0;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
cobalt_flash_remove(struct cobalt * cobalt)110*4882a593Smuzhiyun void cobalt_flash_remove(struct cobalt *cobalt)
111*4882a593Smuzhiyun {
112*4882a593Smuzhiyun if (cobalt->mtd) {
113*4882a593Smuzhiyun mtd_device_unregister(cobalt->mtd);
114*4882a593Smuzhiyun map_destroy(cobalt->mtd);
115*4882a593Smuzhiyun }
116*4882a593Smuzhiyun }
117