xref: /linux/drivers/mtd/nand/raw/brcmnand/bcm6368_nand.c (revision 06d07429858317ded2db7986113a9e0129cd599b)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2015 Simon Arlott
4  *
5  * Derived from bcm63138_nand.c:
6  * Copyright © 2015 Broadcom Corporation
7  *
8  * Derived from bcm963xx_4.12L.06B_consumer/shared/opensource/include/bcm963xx/63268_map_part.h:
9  * Copyright 2000-2010 Broadcom Corporation
10  *
11  * Derived from bcm963xx_4.12L.06B_consumer/shared/opensource/flash/nandflash.c:
12  * Copyright 2000-2010 Broadcom Corporation
13  */
14 
15 #include <linux/device.h>
16 #include <linux/io.h>
17 #include <linux/ioport.h>
18 #include <linux/module.h>
19 #include <linux/of.h>
20 #include <linux/of_address.h>
21 #include <linux/platform_device.h>
22 #include <linux/slab.h>
23 
24 #include "brcmnand.h"
25 
26 struct bcm6368_nand_soc {
27 	struct brcmnand_soc soc;
28 	void __iomem *base;
29 };
30 
31 #define BCM6368_NAND_INT		0x00
32 #define  BCM6368_NAND_STATUS_SHIFT	0
33 #define  BCM6368_NAND_STATUS_MASK	(0xfff << BCM6368_NAND_STATUS_SHIFT)
34 #define  BCM6368_NAND_ENABLE_SHIFT	16
35 #define  BCM6368_NAND_ENABLE_MASK	(0xffff << BCM6368_NAND_ENABLE_SHIFT)
36 #define BCM6368_NAND_BASE_ADDR0	0x04
37 #define BCM6368_NAND_BASE_ADDR1	0x0c
38 
39 enum {
40 	BCM6368_NP_READ		= BIT(0),
41 	BCM6368_BLOCK_ERASE	= BIT(1),
42 	BCM6368_COPY_BACK	= BIT(2),
43 	BCM6368_PAGE_PGM	= BIT(3),
44 	BCM6368_CTRL_READY	= BIT(4),
45 	BCM6368_DEV_RBPIN	= BIT(5),
46 	BCM6368_ECC_ERR_UNC	= BIT(6),
47 	BCM6368_ECC_ERR_CORR	= BIT(7),
48 };
49 
bcm6368_nand_intc_ack(struct brcmnand_soc * soc)50 static bool bcm6368_nand_intc_ack(struct brcmnand_soc *soc)
51 {
52 	struct bcm6368_nand_soc *priv =
53 			container_of(soc, struct bcm6368_nand_soc, soc);
54 	void __iomem *mmio = priv->base + BCM6368_NAND_INT;
55 	u32 val = brcmnand_readl(mmio);
56 
57 	if (val & (BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT)) {
58 		/* Ack interrupt */
59 		val &= ~BCM6368_NAND_STATUS_MASK;
60 		val |= BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT;
61 		brcmnand_writel(val, mmio);
62 		return true;
63 	}
64 
65 	return false;
66 }
67 
bcm6368_nand_intc_set(struct brcmnand_soc * soc,bool en)68 static void bcm6368_nand_intc_set(struct brcmnand_soc *soc, bool en)
69 {
70 	struct bcm6368_nand_soc *priv =
71 			container_of(soc, struct bcm6368_nand_soc, soc);
72 	void __iomem *mmio = priv->base + BCM6368_NAND_INT;
73 	u32 val = brcmnand_readl(mmio);
74 
75 	/* Don't ack any interrupts */
76 	val &= ~BCM6368_NAND_STATUS_MASK;
77 
78 	if (en)
79 		val |= BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT;
80 	else
81 		val &= ~(BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT);
82 
83 	brcmnand_writel(val, mmio);
84 }
85 
bcm6368_nand_probe(struct platform_device * pdev)86 static int bcm6368_nand_probe(struct platform_device *pdev)
87 {
88 	struct device *dev = &pdev->dev;
89 	struct bcm6368_nand_soc *priv;
90 	struct brcmnand_soc *soc;
91 
92 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
93 	if (!priv)
94 		return -ENOMEM;
95 	soc = &priv->soc;
96 
97 	priv->base = devm_platform_ioremap_resource_byname(pdev, "nand-int-base");
98 	if (IS_ERR(priv->base))
99 		return PTR_ERR(priv->base);
100 
101 	soc->ctlrdy_ack = bcm6368_nand_intc_ack;
102 	soc->ctlrdy_set_enabled = bcm6368_nand_intc_set;
103 
104 	/* Disable and ack all interrupts  */
105 	brcmnand_writel(0, priv->base + BCM6368_NAND_INT);
106 	brcmnand_writel(BCM6368_NAND_STATUS_MASK,
107 			priv->base + BCM6368_NAND_INT);
108 
109 	return brcmnand_probe(pdev, soc);
110 }
111 
112 static const struct of_device_id bcm6368_nand_of_match[] = {
113 	{ .compatible = "brcm,nand-bcm6368" },
114 	{},
115 };
116 MODULE_DEVICE_TABLE(of, bcm6368_nand_of_match);
117 
118 static struct platform_driver bcm6368_nand_driver = {
119 	.probe			= bcm6368_nand_probe,
120 	.remove_new		= brcmnand_remove,
121 	.driver = {
122 		.name		= "bcm6368_nand",
123 		.pm		= &brcmnand_pm_ops,
124 		.of_match_table	= bcm6368_nand_of_match,
125 	}
126 };
127 module_platform_driver(bcm6368_nand_driver);
128 
129 MODULE_LICENSE("GPL");
130 MODULE_AUTHOR("Simon Arlott");
131 MODULE_DESCRIPTION("NAND driver for BCM6368");
132