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#include <linux/printk.h>
13
14#include "brcmnand.h"
15
16struct bcm68360_nand_soc {
17	struct brcmnand_soc soc;
18	void __iomem *base;
19};
20
21#define BCM68360_NAND_INT		0x00
22#define BCM68360_NAND_STATUS_SHIFT	0
23#define BCM68360_NAND_STATUS_MASK	(0xfff << BCM68360_NAND_STATUS_SHIFT)
24
25#define BCM68360_NAND_INT_EN		0x04
26#define BCM68360_NAND_ENABLE_SHIFT	0
27#define BCM68360_NAND_ENABLE_MASK	(0xffff << BCM68360_NAND_ENABLE_SHIFT)
28
29enum {
30	BCM68360_NP_READ		= BIT(0),
31	BCM68360_BLOCK_ERASE	= BIT(1),
32	BCM68360_COPY_BACK	= BIT(2),
33	BCM68360_PAGE_PGM	= BIT(3),
34	BCM68360_CTRL_READY	= BIT(4),
35	BCM68360_DEV_RBPIN	= BIT(5),
36	BCM68360_ECC_ERR_UNC	= BIT(6),
37	BCM68360_ECC_ERR_CORR	= BIT(7),
38};
39
40static bool bcm68360_nand_intc_ack(struct brcmnand_soc *soc)
41{
42	struct bcm68360_nand_soc *priv =
43			container_of(soc, struct bcm68360_nand_soc, soc);
44	void __iomem *mmio = priv->base + BCM68360_NAND_INT;
45	u32 val = brcmnand_readl(mmio);
46
47	if (val & (BCM68360_CTRL_READY << BCM68360_NAND_STATUS_SHIFT)) {
48		/* Ack interrupt */
49		val &= ~BCM68360_NAND_STATUS_MASK;
50		val |= BCM68360_CTRL_READY << BCM68360_NAND_STATUS_SHIFT;
51		brcmnand_writel(val, mmio);
52		return true;
53	}
54
55	return false;
56}
57
58static void bcm68360_nand_intc_set(struct brcmnand_soc *soc, bool en)
59{
60	struct bcm68360_nand_soc *priv =
61			container_of(soc, struct bcm68360_nand_soc, soc);
62	void __iomem *mmio = priv->base + BCM68360_NAND_INT_EN;
63	u32 val = brcmnand_readl(mmio);
64
65	/* Don't ack any interrupts */
66	val &= ~BCM68360_NAND_STATUS_MASK;
67
68	if (en)
69		val |= BCM68360_CTRL_READY << BCM68360_NAND_ENABLE_SHIFT;
70	else
71		val &= ~(BCM68360_CTRL_READY << BCM68360_NAND_ENABLE_SHIFT);
72
73	brcmnand_writel(val, mmio);
74}
75
76static int bcm68360_nand_probe(struct udevice *dev)
77{
78	struct udevice *pdev = dev;
79	struct bcm68360_nand_soc *priv = dev_get_priv(dev);
80	struct brcmnand_soc *soc;
81	struct resource res;
82
83	soc = &priv->soc;
84
85	dev_read_resource_byname(pdev, "nand-int-base", &res);
86	priv->base = devm_ioremap(dev, res.start, resource_size(&res));
87	if (IS_ERR(priv->base))
88		return PTR_ERR(priv->base);
89
90	soc->ctlrdy_ack = bcm68360_nand_intc_ack;
91	soc->ctlrdy_set_enabled = bcm68360_nand_intc_set;
92
93	/* Disable and ack all interrupts  */
94	brcmnand_writel(0, priv->base + BCM68360_NAND_INT_EN);
95	brcmnand_writel(0, priv->base + BCM68360_NAND_INT);
96
97	return brcmnand_probe(pdev, soc);
98}
99
100static const struct udevice_id bcm68360_nand_dt_ids[] = {
101	{
102		.compatible = "brcm,nand-bcm68360",
103	},
104	{ /* sentinel */ }
105};
106
107U_BOOT_DRIVER(bcm68360_nand) = {
108	.name = "bcm68360-nand",
109	.id = UCLASS_MTD,
110	.of_match = bcm68360_nand_dt_ids,
111	.probe = bcm68360_nand_probe,
112	.priv_auto	= sizeof(struct bcm68360_nand_soc),
113};
114
115void board_nand_init(void)
116{
117	struct udevice *dev;
118	int ret;
119
120	ret = uclass_get_device_by_driver(UCLASS_MTD,
121					  DM_DRIVER_GET(bcm68360_nand), &dev);
122	if (ret && ret != -ENODEV)
123		pr_err("Failed to initialize %s. (error %d)\n", dev->name,
124		       ret);
125}
126