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 = 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