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 
17 struct 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 
25 enum {
26 	BCM63138_CTLRDY		= BIT(4),
27 };
28 
29 static 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 
44 static 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 
59 static 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 
80 static const struct of_device_id bcm63138_nand_of_match[] = {
81 	{ .compatible = "brcm,nand-bcm63138" },
82 	{},
83 };
84 MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);
85 
86 static 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 };
95 module_platform_driver(bcm63138_nand_driver);
96 
97 MODULE_LICENSE("GPL v2");
98 MODULE_AUTHOR("Brian Norris");
99 MODULE_DESCRIPTION("NAND driver for BCM63138");
100