1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
// SPDX-License-Identifier: GPL-2.0
/*
* Cortina Systems Gemini OF physmap add-on
* Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
*
* This SoC has an elaborate flash control register, so we need to
* detect and set it up when booting on this platform.
*/
#include <linux/export.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/mtd/map.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/bitops.h>
#include "physmap_of_gemini.h"
/*
* The Flash-relevant parts of the global status register
* These would also be relevant for a NAND driver.
*/
#define GLOBAL_STATUS 0x04
#define FLASH_TYPE_MASK (0x3 << 24)
#define FLASH_TYPE_NAND_2K (0x3 << 24)
#define FLASH_TYPE_NAND_512 (0x2 << 24)
#define FLASH_TYPE_PARALLEL (0x1 << 24)
#define FLASH_TYPE_SERIAL (0x0 << 24)
/* if parallel */
#define FLASH_WIDTH_16BIT (1 << 23) /* else 8 bit */
/* if serial */
#define FLASH_ATMEL (1 << 23) /* else STM */
#define FLASH_SIZE_MASK (0x3 << 21)
#define NAND_256M (0x3 << 21) /* and more */
#define NAND_128M (0x2 << 21)
#define NAND_64M (0x1 << 21)
#define NAND_32M (0x0 << 21)
#define ATMEL_16M (0x3 << 21) /* and more */
#define ATMEL_8M (0x2 << 21)
#define ATMEL_4M_2M (0x1 << 21)
#define ATMEL_1M (0x0 << 21) /* and less */
#define STM_32M (1 << 22) /* and more */
#define STM_16M (0 << 22) /* and less */
#define FLASH_PARALLEL_HIGH_PIN_CNT (1 << 20) /* else low pin cnt */
static const struct of_device_id syscon_match[] = {
{ .compatible = "cortina,gemini-syscon" },
{ },
};
int of_flash_probe_gemini(struct platform_device *pdev,
struct device_node *np,
struct map_info *map)
{
struct regmap *rmap;
struct device *dev = &pdev->dev;
u32 val;
int ret;
/* Multiplatform guard */
if (!of_device_is_compatible(np, "cortina,gemini-flash"))
return 0;
rmap = syscon_regmap_lookup_by_phandle(np, "syscon");
if (IS_ERR(rmap)) {
dev_err(dev, "no syscon\n");
return PTR_ERR(rmap);
}
ret = regmap_read(rmap, GLOBAL_STATUS, &val);
if (ret) {
dev_err(dev, "failed to read global status register\n");
return -ENODEV;
}
dev_dbg(dev, "global status reg: %08x\n", val);
/*
* It would be contradictory if a physmap flash was NOT parallel.
*/
if ((val & FLASH_TYPE_MASK) != FLASH_TYPE_PARALLEL) {
dev_err(dev, "flash is not parallel\n");
return -ENODEV;
}
/*
* Complain if DT data and hardware definition is different.
*/
if (val & FLASH_WIDTH_16BIT) {
if (map->bankwidth != 2)
dev_warn(dev, "flash hardware say flash is 16 bit wide but DT says it is %d bits wide\n",
map->bankwidth * 8);
} else {
if (map->bankwidth != 1)
dev_warn(dev, "flash hardware say flash is 8 bit wide but DT says it is %d bits wide\n",
map->bankwidth * 8);
}
dev_info(&pdev->dev, "initialized Gemini-specific physmap control\n");
return 0;
}
|
