1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright © 2015 Broadcom Corporation
4 */
5
6#include <linux/device.h>
7#include <linux/io.h>
8#include <linux/ioport.h>
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/of_address.h>
12#include <linux/platform_device.h>
13#include <linux/slab.h>
14
15#include "brcmnand.h"
16
17struct bcm63138_nand_soc {
18	struct brcmnand_soc soc;
19	void __iomem *base;
20};
21
22#define BCM63138_NAND_INT_STATUS		0x00
23#define BCM63138_NAND_INT_EN			0x04
24
25enum {
26	BCM63138_CTLRDY		= BIT(4),
27};
28
29static bool bcm63138_nand_intc_ack(struct brcmnand_soc *soc)
30{
31	struct bcm63138_nand_soc *priv =
32			container_of(soc, struct bcm63138_nand_soc, soc);
33	void __iomem *mmio = priv->base + BCM63138_NAND_INT_STATUS;
34	u32 val = brcmnand_readl(mmio);
35
36	if (val & BCM63138_CTLRDY) {
37		brcmnand_writel(val & ~BCM63138_CTLRDY, mmio);
38		return true;
39	}
40
41	return false;
42}
43
44static void bcm63138_nand_intc_set(struct brcmnand_soc *soc, bool en)
45{
46	struct bcm63138_nand_soc *priv =
47			container_of(soc, struct bcm63138_nand_soc, soc);
48	void __iomem *mmio = priv->base + BCM63138_NAND_INT_EN;
49	u32 val = brcmnand_readl(mmio);
50
51	if (en)
52		val |= BCM63138_CTLRDY;
53	else
54		val &= ~BCM63138_CTLRDY;
55
56	brcmnand_writel(val, mmio);
57}
58
59static int bcm63138_nand_probe(struct platform_device *pdev)
60{
61	struct device *dev = &pdev->dev;
62	struct bcm63138_nand_soc *priv;
63	struct brcmnand_soc *soc;
64
65	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
66	if (!priv)
67		return -ENOMEM;
68	soc = &priv->soc;
69
70	priv->base = devm_platform_ioremap_resource_byname(pdev, "nand-int-base");
71	if (IS_ERR(priv->base))
72		return PTR_ERR(priv->base);
73
74	soc->ctlrdy_ack = bcm63138_nand_intc_ack;
75	soc->ctlrdy_set_enabled = bcm63138_nand_intc_set;
76
77	return brcmnand_probe(pdev, soc);
78}
79
80static const struct of_device_id bcm63138_nand_of_match[] = {
81	{ .compatible = "brcm,nand-bcm63138" },
82	{},
83};
84MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);
85
86static struct platform_driver bcm63138_nand_driver = {
87	.probe			= bcm63138_nand_probe,
88	.remove			= brcmnand_remove,
89	.driver = {
90		.name		= "bcm63138_nand",
91		.pm		= &brcmnand_pm_ops,
92		.of_match_table	= bcm63138_nand_of_match,
93	}
94};
95module_platform_driver(bcm63138_nand_driver);
96
97MODULE_LICENSE("GPL v2");
98MODULE_AUTHOR("Brian Norris");
99MODULE_DESCRIPTION("NAND driver for BCM63138");
100