1 // SPDX-License-Identifier: GPL-2.0+
2
3 #include <common.h>
4 #include <asm/io.h>
5 #include <memalign.h>
6 #include <nand.h>
7 #include <linux/bitops.h>
8 #include <linux/errno.h>
9 #include <linux/io.h>
10 #include <linux/ioport.h>
11 #include <dm.h>
12
13 #include "brcmnand.h"
14
15 struct bcm6368_nand_soc {
16 struct brcmnand_soc soc;
17 void __iomem *base;
18 };
19
20 #define soc_to_priv(_soc) container_of(_soc, struct bcm6368_nand_soc, soc)
21
22 #define BCM6368_NAND_INT 0x00
23 #define BCM6368_NAND_STATUS_SHIFT 0
24 #define BCM6368_NAND_STATUS_MASK (0xfff << BCM6368_NAND_STATUS_SHIFT)
25 #define BCM6368_NAND_ENABLE_SHIFT 16
26 #define BCM6368_NAND_ENABLE_MASK (0xffff << BCM6368_NAND_ENABLE_SHIFT)
27
28 enum {
29 BCM6368_NP_READ = BIT(0),
30 BCM6368_BLOCK_ERASE = BIT(1),
31 BCM6368_COPY_BACK = BIT(2),
32 BCM6368_PAGE_PGM = BIT(3),
33 BCM6368_CTRL_READY = BIT(4),
34 BCM6368_DEV_RBPIN = BIT(5),
35 BCM6368_ECC_ERR_UNC = BIT(6),
36 BCM6368_ECC_ERR_CORR = BIT(7),
37 };
38
bcm6368_nand_intc_ack(struct brcmnand_soc * soc)39 static bool bcm6368_nand_intc_ack(struct brcmnand_soc *soc)
40 {
41 struct bcm6368_nand_soc *priv = soc_to_priv(soc);
42 void __iomem *mmio = priv->base + BCM6368_NAND_INT;
43 u32 val = brcmnand_readl(mmio);
44
45 if (val & (BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT)) {
46 /* Ack interrupt */
47 val &= ~BCM6368_NAND_STATUS_MASK;
48 val |= BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT;
49 brcmnand_writel(val, mmio);
50 return true;
51 }
52
53 return false;
54 }
55
bcm6368_nand_intc_set(struct brcmnand_soc * soc,bool en)56 static void bcm6368_nand_intc_set(struct brcmnand_soc *soc, bool en)
57 {
58 struct bcm6368_nand_soc *priv = soc_to_priv(soc);
59 void __iomem *mmio = priv->base + BCM6368_NAND_INT;
60 u32 val = brcmnand_readl(mmio);
61
62 /* Don't ack any interrupts */
63 val &= ~BCM6368_NAND_STATUS_MASK;
64
65 if (en)
66 val |= BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT;
67 else
68 val &= ~(BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT);
69
70 brcmnand_writel(val, mmio);
71 }
72
bcm6368_nand_probe(struct udevice * dev)73 static int bcm6368_nand_probe(struct udevice *dev)
74 {
75 struct bcm6368_nand_soc *priv = dev_get_priv(dev);
76 struct brcmnand_soc *soc = &priv->soc;
77
78 priv->base = dev_remap_addr_name(dev, "nand-int-base");
79 if (!priv->base)
80 return -EINVAL;
81
82 soc->ctlrdy_ack = bcm6368_nand_intc_ack;
83 soc->ctlrdy_set_enabled = bcm6368_nand_intc_set;
84
85 /* Disable and ack all interrupts */
86 brcmnand_writel(0, priv->base + BCM6368_NAND_INT);
87 brcmnand_writel(BCM6368_NAND_STATUS_MASK,
88 priv->base + BCM6368_NAND_INT);
89
90 return brcmnand_probe(dev, soc);
91 }
92
93 static const struct udevice_id bcm6368_nand_dt_ids[] = {
94 {
95 .compatible = "brcm,nand-bcm6368",
96 },
97 { /* sentinel */ }
98 };
99
100 U_BOOT_DRIVER(bcm6368_nand) = {
101 .name = "bcm6368-nand",
102 .id = UCLASS_MTD,
103 .of_match = bcm6368_nand_dt_ids,
104 .probe = bcm6368_nand_probe,
105 .priv_auto = sizeof(struct bcm6368_nand_soc),
106 };
107
board_nand_init(void)108 void board_nand_init(void)
109 {
110 struct udevice *dev;
111 int ret;
112
113 ret = uclass_get_device_by_driver(UCLASS_MTD,
114 DM_DRIVER_GET(bcm6368_nand), &dev);
115 if (ret && ret != -ENODEV)
116 pr_err("Failed to initialize %s. (error %d)\n", dev->name,
117 ret);
118 }
119