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 iproc_nand_soc {
18 struct brcmnand_soc soc;
19
20 void __iomem *idm_base;
21 void __iomem *ext_base;
22 spinlock_t idm_lock;
23 };
24
25 #define IPROC_NAND_CTLR_READY_OFFSET 0x10
26 #define IPROC_NAND_CTLR_READY BIT(0)
27
28 #define IPROC_NAND_IO_CTRL_OFFSET 0x00
29 #define IPROC_NAND_APB_LE_MODE BIT(24)
30 #define IPROC_NAND_INT_CTRL_READ_ENABLE BIT(6)
31
iproc_nand_intc_ack(struct brcmnand_soc * soc)32 static bool iproc_nand_intc_ack(struct brcmnand_soc *soc)
33 {
34 struct iproc_nand_soc *priv =
35 container_of(soc, struct iproc_nand_soc, soc);
36 void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET;
37 u32 val = brcmnand_readl(mmio);
38
39 if (val & IPROC_NAND_CTLR_READY) {
40 brcmnand_writel(IPROC_NAND_CTLR_READY, mmio);
41 return true;
42 }
43
44 return false;
45 }
46
iproc_nand_intc_set(struct brcmnand_soc * soc,bool en)47 static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en)
48 {
49 struct iproc_nand_soc *priv =
50 container_of(soc, struct iproc_nand_soc, soc);
51 void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
52 u32 val;
53 unsigned long flags;
54
55 spin_lock_irqsave(&priv->idm_lock, flags);
56
57 val = brcmnand_readl(mmio);
58
59 if (en)
60 val |= IPROC_NAND_INT_CTRL_READ_ENABLE;
61 else
62 val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE;
63
64 brcmnand_writel(val, mmio);
65
66 spin_unlock_irqrestore(&priv->idm_lock, flags);
67 }
68
iproc_nand_apb_access(struct brcmnand_soc * soc,bool prepare,bool is_param)69 static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare,
70 bool is_param)
71 {
72 struct iproc_nand_soc *priv =
73 container_of(soc, struct iproc_nand_soc, soc);
74 void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
75 u32 val;
76 unsigned long flags;
77
78 spin_lock_irqsave(&priv->idm_lock, flags);
79
80 val = brcmnand_readl(mmio);
81
82 /*
83 * In the case of BE or when dealing with NAND data, alway configure
84 * the APB bus to LE mode before accessing the FIFO and back to BE mode
85 * after the access is done
86 */
87 if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) || !is_param) {
88 if (prepare)
89 val |= IPROC_NAND_APB_LE_MODE;
90 else
91 val &= ~IPROC_NAND_APB_LE_MODE;
92 } else { /* when in LE accessing the parameter page, keep APB in BE */
93 val &= ~IPROC_NAND_APB_LE_MODE;
94 }
95
96 brcmnand_writel(val, mmio);
97
98 spin_unlock_irqrestore(&priv->idm_lock, flags);
99 }
100
iproc_nand_probe(struct platform_device * pdev)101 static int iproc_nand_probe(struct platform_device *pdev)
102 {
103 struct device *dev = &pdev->dev;
104 struct iproc_nand_soc *priv;
105 struct brcmnand_soc *soc;
106
107 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
108 if (!priv)
109 return -ENOMEM;
110 soc = &priv->soc;
111
112 spin_lock_init(&priv->idm_lock);
113
114 priv->idm_base = devm_platform_ioremap_resource_byname(pdev, "iproc-idm");
115 if (IS_ERR(priv->idm_base))
116 return PTR_ERR(priv->idm_base);
117
118 priv->ext_base = devm_platform_ioremap_resource_byname(pdev, "iproc-ext");
119 if (IS_ERR(priv->ext_base))
120 return PTR_ERR(priv->ext_base);
121
122 soc->ctlrdy_ack = iproc_nand_intc_ack;
123 soc->ctlrdy_set_enabled = iproc_nand_intc_set;
124 soc->prepare_data_bus = iproc_nand_apb_access;
125
126 return brcmnand_probe(pdev, soc);
127 }
128
129 static const struct of_device_id iproc_nand_of_match[] = {
130 { .compatible = "brcm,nand-iproc" },
131 {},
132 };
133 MODULE_DEVICE_TABLE(of, iproc_nand_of_match);
134
135 static struct platform_driver iproc_nand_driver = {
136 .probe = iproc_nand_probe,
137 .remove = brcmnand_remove,
138 .driver = {
139 .name = "iproc_nand",
140 .pm = &brcmnand_pm_ops,
141 .of_match_table = iproc_nand_of_match,
142 }
143 };
144 module_platform_driver(iproc_nand_driver);
145
146 MODULE_LICENSE("GPL v2");
147 MODULE_AUTHOR("Brian Norris");
148 MODULE_AUTHOR("Ray Jui");
149 MODULE_DESCRIPTION("NAND driver for Broadcom IPROC-based SoCs");
150