1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * tsunami_flash.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * flash chip on alpha ds10...
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include <asm/io.h>
8*4882a593Smuzhiyun #include <asm/core_tsunami.h>
9*4882a593Smuzhiyun #include <linux/init.h>
10*4882a593Smuzhiyun #include <linux/mtd/map.h>
11*4882a593Smuzhiyun #include <linux/mtd/mtd.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #define FLASH_ENABLE_PORT 0x00C00001
14*4882a593Smuzhiyun #define FLASH_ENABLE_BYTE 0x01
15*4882a593Smuzhiyun #define FLASH_DISABLE_BYTE 0x00
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #define MAX_TIG_FLASH_SIZE (12*1024*1024)
tsunami_flash_read8(struct map_info * map,unsigned long offset)18*4882a593Smuzhiyun static inline map_word tsunami_flash_read8(struct map_info *map, unsigned long offset)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun map_word val;
21*4882a593Smuzhiyun val.x[0] = tsunami_tig_readb(offset);
22*4882a593Smuzhiyun return val;
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
tsunami_flash_write8(struct map_info * map,map_word value,unsigned long offset)25*4882a593Smuzhiyun static void tsunami_flash_write8(struct map_info *map, map_word value, unsigned long offset)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun tsunami_tig_writeb(value.x[0], offset);
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
tsunami_flash_copy_from(struct map_info * map,void * addr,unsigned long offset,ssize_t len)30*4882a593Smuzhiyun static void tsunami_flash_copy_from(
31*4882a593Smuzhiyun struct map_info *map, void *addr, unsigned long offset, ssize_t len)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun unsigned char *dest;
34*4882a593Smuzhiyun dest = addr;
35*4882a593Smuzhiyun while(len && (offset < MAX_TIG_FLASH_SIZE)) {
36*4882a593Smuzhiyun *dest = tsunami_tig_readb(offset);
37*4882a593Smuzhiyun offset++;
38*4882a593Smuzhiyun dest++;
39*4882a593Smuzhiyun len--;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
tsunami_flash_copy_to(struct map_info * map,unsigned long offset,const void * addr,ssize_t len)43*4882a593Smuzhiyun static void tsunami_flash_copy_to(
44*4882a593Smuzhiyun struct map_info *map, unsigned long offset,
45*4882a593Smuzhiyun const void *addr, ssize_t len)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun const unsigned char *src;
48*4882a593Smuzhiyun src = addr;
49*4882a593Smuzhiyun while(len && (offset < MAX_TIG_FLASH_SIZE)) {
50*4882a593Smuzhiyun tsunami_tig_writeb(*src, offset);
51*4882a593Smuzhiyun offset++;
52*4882a593Smuzhiyun src++;
53*4882a593Smuzhiyun len--;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun /*
58*4882a593Smuzhiyun * Deliberately don't provide operations wider than 8 bits. I don't
59*4882a593Smuzhiyun * have then and it scares me to think how you could mess up if
60*4882a593Smuzhiyun * you tried to use them. Buswidth is correctly so I'm safe.
61*4882a593Smuzhiyun */
62*4882a593Smuzhiyun static struct map_info tsunami_flash_map = {
63*4882a593Smuzhiyun .name = "flash chip on the Tsunami TIG bus",
64*4882a593Smuzhiyun .size = MAX_TIG_FLASH_SIZE,
65*4882a593Smuzhiyun .phys = NO_XIP,
66*4882a593Smuzhiyun .bankwidth = 1,
67*4882a593Smuzhiyun .read = tsunami_flash_read8,
68*4882a593Smuzhiyun .copy_from = tsunami_flash_copy_from,
69*4882a593Smuzhiyun .write = tsunami_flash_write8,
70*4882a593Smuzhiyun .copy_to = tsunami_flash_copy_to,
71*4882a593Smuzhiyun };
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun static struct mtd_info *tsunami_flash_mtd;
74*4882a593Smuzhiyun
cleanup_tsunami_flash(void)75*4882a593Smuzhiyun static void __exit cleanup_tsunami_flash(void)
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun struct mtd_info *mtd;
78*4882a593Smuzhiyun mtd = tsunami_flash_mtd;
79*4882a593Smuzhiyun if (mtd) {
80*4882a593Smuzhiyun mtd_device_unregister(mtd);
81*4882a593Smuzhiyun map_destroy(mtd);
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun tsunami_flash_mtd = 0;
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun static const char * const rom_probe_types[] = {
87*4882a593Smuzhiyun "cfi_probe", "jedec_probe", "map_rom", NULL };
88*4882a593Smuzhiyun
init_tsunami_flash(void)89*4882a593Smuzhiyun static int __init init_tsunami_flash(void)
90*4882a593Smuzhiyun {
91*4882a593Smuzhiyun const char * const *type;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun tsunami_tig_writeb(FLASH_ENABLE_BYTE, FLASH_ENABLE_PORT);
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun tsunami_flash_mtd = 0;
96*4882a593Smuzhiyun type = rom_probe_types;
97*4882a593Smuzhiyun for(; !tsunami_flash_mtd && *type; type++) {
98*4882a593Smuzhiyun tsunami_flash_mtd = do_map_probe(*type, &tsunami_flash_map);
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun if (tsunami_flash_mtd) {
101*4882a593Smuzhiyun tsunami_flash_mtd->owner = THIS_MODULE;
102*4882a593Smuzhiyun mtd_device_register(tsunami_flash_mtd, NULL, 0);
103*4882a593Smuzhiyun return 0;
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun return -ENXIO;
106*4882a593Smuzhiyun }
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun module_init(init_tsunami_flash);
109*4882a593Smuzhiyun module_exit(cleanup_tsunami_flash);
110