1
2
3#include <common.h>
4#include <asm/io.h>
5#include <memalign.h>
6#include <nand.h>
7#include <linux/errno.h>
8#include <linux/io.h>
9#include <linux/ioport.h>
10#include <dm.h>
11
12#include "brcmnand.h"
13
14struct bcm6838_nand_soc {
15 struct brcmnand_soc soc;
16 void __iomem *base;
17};
18
19#define BCM6838_NAND_INT 0x00
20#define BCM6838_NAND_STATUS_SHIFT 0
21#define BCM6838_NAND_STATUS_MASK (0xfff << BCM6838_NAND_STATUS_SHIFT)
22#define BCM6838_NAND_ENABLE_SHIFT 16
23#define BCM6838_NAND_ENABLE_MASK (0xffff << BCM6838_NAND_ENABLE_SHIFT)
24
25enum {
26 BCM6838_NP_READ = BIT(0),
27 BCM6838_BLOCK_ERASE = BIT(1),
28 BCM6838_COPY_BACK = BIT(2),
29 BCM6838_PAGE_PGM = BIT(3),
30 BCM6838_CTRL_READY = BIT(4),
31 BCM6838_DEV_RBPIN = BIT(5),
32 BCM6838_ECC_ERR_UNC = BIT(6),
33 BCM6838_ECC_ERR_CORR = BIT(7),
34};
35
36static bool bcm6838_nand_intc_ack(struct brcmnand_soc *soc)
37{
38 struct bcm6838_nand_soc *priv =
39 container_of(soc, struct bcm6838_nand_soc, soc);
40 void __iomem *mmio = priv->base + BCM6838_NAND_INT;
41 u32 val = brcmnand_readl(mmio);
42
43 if (val & (BCM6838_CTRL_READY << BCM6838_NAND_STATUS_SHIFT)) {
44
45 val &= ~BCM6838_NAND_STATUS_MASK;
46 val |= BCM6838_CTRL_READY << BCM6838_NAND_STATUS_SHIFT;
47 brcmnand_writel(val, mmio);
48 return true;
49 }
50
51 return false;
52}
53
54static void bcm6838_nand_intc_set(struct brcmnand_soc *soc, bool en)
55{
56 struct bcm6838_nand_soc *priv =
57 container_of(soc, struct bcm6838_nand_soc, soc);
58 void __iomem *mmio = priv->base + BCM6838_NAND_INT;
59 u32 val = brcmnand_readl(mmio);
60
61
62 val &= ~BCM6838_NAND_STATUS_MASK;
63
64 if (en)
65 val |= BCM6838_CTRL_READY << BCM6838_NAND_ENABLE_SHIFT;
66 else
67 val &= ~(BCM6838_CTRL_READY << BCM6838_NAND_ENABLE_SHIFT);
68
69 brcmnand_writel(val, mmio);
70}
71
72static int bcm6838_nand_probe(struct udevice *dev)
73{
74 struct udevice *pdev = dev;
75 struct bcm6838_nand_soc *priv = dev_get_priv(dev);
76 struct brcmnand_soc *soc;
77 struct resource res;
78
79 soc = &priv->soc;
80
81 dev_read_resource_byname(pdev, "nand-int-base", &res);
82 priv->base = ioremap(res.start, resource_size(&res));
83 if (IS_ERR(priv->base))
84 return PTR_ERR(priv->base);
85
86 soc->ctlrdy_ack = bcm6838_nand_intc_ack;
87 soc->ctlrdy_set_enabled = bcm6838_nand_intc_set;
88
89
90 brcmnand_writel(0, priv->base + BCM6838_NAND_INT);
91 brcmnand_writel(BCM6838_NAND_STATUS_MASK,
92 priv->base + BCM6838_NAND_INT);
93
94 return brcmnand_probe(pdev, soc);
95}
96
97static const struct udevice_id bcm6838_nand_dt_ids[] = {
98 {
99 .compatible = "brcm,nand-bcm6838",
100 },
101 { }
102};
103
104U_BOOT_DRIVER(bcm6838_nand) = {
105 .name = "bcm6838-nand",
106 .id = UCLASS_MTD,
107 .of_match = bcm6838_nand_dt_ids,
108 .probe = bcm6838_nand_probe,
109 .priv_auto_alloc_size = sizeof(struct bcm6838_nand_soc),
110};
111
112void board_nand_init(void)
113{
114 struct udevice *dev;
115 int ret;
116
117 ret = uclass_get_device_by_driver(UCLASS_MTD,
118 DM_GET_DRIVER(bcm6838_nand), &dev);
119 if (ret && ret != -ENODEV)
120 pr_err("Failed to initialize %s. (error %d)\n", dev->name,
121 ret);
122}
123
