1 #include <linux/kernel.h>
2 #include <linux/module.h>
3 #include <linux/slab.h>
4 #include <linux/mtd/mtd.h>
5 #include <linux/platform_device.h>
6 #include <linux/bcma/bcma.h>
7 
8 #include "bcm47xxsflash.h"
9 
10 MODULE_LICENSE("GPL");
11 MODULE_DESCRIPTION("Serial flash driver for BCMA bus");
12 
13 static const char * const probes[] = { "bcm47xxpart", NULL };
14 
15 static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,
16 			      size_t *retlen, u_char *buf)
17 {
18 	struct bcm47xxsflash *b47s = mtd->priv;
19 
20 	/* Check address range */
21 	if ((from + len) > mtd->size)
22 		return -EINVAL;
23 
24 	memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
25 		      len);
26 	*retlen = len;
27 
28 	return len;
29 }
30 
31 static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
32 {
33 	struct mtd_info *mtd = &b47s->mtd;
34 
35 	mtd->priv = b47s;
36 	mtd->name = "bcm47xxsflash";
37 	mtd->owner = THIS_MODULE;
38 	mtd->type = MTD_ROM;
39 	mtd->size = b47s->size;
40 	mtd->_read = bcm47xxsflash_read;
41 
42 	/* TODO: implement writing support and verify/change following code */
43 	mtd->flags = MTD_CAP_ROM;
44 	mtd->writebufsize = mtd->writesize = 1;
45 }
46 
47 /**************************************************
48  * BCMA
49  **************************************************/
50 
51 static int bcm47xxsflash_bcma_probe(struct platform_device *pdev)
52 {
53 	struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
54 	struct bcm47xxsflash *b47s;
55 	int err;
56 
57 	b47s = kzalloc(sizeof(*b47s), GFP_KERNEL);
58 	if (!b47s) {
59 		err = -ENOMEM;
60 		goto out;
61 	}
62 	sflash->priv = b47s;
63 
64 	b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash);
65 
66 	switch (b47s->bcma_cc->capabilities & BCMA_CC_CAP_FLASHT) {
67 	case BCMA_CC_FLASHT_STSER:
68 		b47s->type = BCM47XXSFLASH_TYPE_ST;
69 		break;
70 	case BCMA_CC_FLASHT_ATSER:
71 		b47s->type = BCM47XXSFLASH_TYPE_ATMEL;
72 		break;
73 	}
74 
75 	b47s->window = sflash->window;
76 	b47s->blocksize = sflash->blocksize;
77 	b47s->numblocks = sflash->numblocks;
78 	b47s->size = sflash->size;
79 	bcm47xxsflash_fill_mtd(b47s);
80 
81 	err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);
82 	if (err) {
83 		pr_err("Failed to register MTD device: %d\n", err);
84 		goto err_dev_reg;
85 	}
86 
87 	return 0;
88 
89 err_dev_reg:
90 	kfree(&b47s->mtd);
91 out:
92 	return err;
93 }
94 
95 static int bcm47xxsflash_bcma_remove(struct platform_device *pdev)
96 {
97 	struct bcma_sflash *sflash = dev_get_platdata(&pdev->dev);
98 	struct bcm47xxsflash *b47s = sflash->priv;
99 
100 	mtd_device_unregister(&b47s->mtd);
101 	kfree(b47s);
102 
103 	return 0;
104 }
105 
106 static struct platform_driver bcma_sflash_driver = {
107 	.probe	= bcm47xxsflash_bcma_probe,
108 	.remove = bcm47xxsflash_bcma_remove,
109 	.driver = {
110 		.name = "bcma_sflash",
111 		.owner = THIS_MODULE,
112 	},
113 };
114 
115 /**************************************************
116  * Init
117  **************************************************/
118 
119 static int __init bcm47xxsflash_init(void)
120 {
121 	int err;
122 
123 	err = platform_driver_register(&bcma_sflash_driver);
124 	if (err)
125 		pr_err("Failed to register BCMA serial flash driver: %d\n",
126 		       err);
127 
128 	return err;
129 }
130 
131 static void __exit bcm47xxsflash_exit(void)
132 {
133 	platform_driver_unregister(&bcma_sflash_driver);
134 }
135 
136 module_init(bcm47xxsflash_init);
137 module_exit(bcm47xxsflash_exit);
138