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	struct resource *res;
65
66	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
67	if (!priv)
68		return -ENOMEM;
69	soc = &priv->soc;
70
71	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-int-base");
72	priv->base = devm_ioremap_resource(dev, res);
73	if (IS_ERR(priv->base))
74		return PTR_ERR(priv->base);
75
76	soc->ctlrdy_ack = bcm63138_nand_intc_ack;
77	soc->ctlrdy_set_enabled = bcm63138_nand_intc_set;
78
79	return brcmnand_probe(pdev, soc);
80}
81
82static const struct of_device_id bcm63138_nand_of_match[] = {
83	{ .compatible = "brcm,nand-bcm63138" },
84	{},
85};
86MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);
87
88static struct platform_driver bcm63138_nand_driver = {
89	.probe			= bcm63138_nand_probe,
90	.remove			= brcmnand_remove,
91	.driver = {
92		.name		= "bcm63138_nand",
93		.pm		= &brcmnand_pm_ops,
94		.of_match_table	= bcm63138_nand_of_match,
95	}
96};
97module_platform_driver(bcm63138_nand_driver);
98
99MODULE_LICENSE("GPL v2");
100MODULE_AUTHOR("Brian Norris");
101MODULE_DESCRIPTION("NAND driver for BCM63138");
102