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1 | /* |
2 | * Copyright © 2015 Broadcom Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/device.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/ioport.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/of_address.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/slab.h> | |
22 | ||
23 | #include "brcmnand.h" | |
24 | ||
25 | struct iproc_nand_soc_priv { | |
26 | void __iomem *idm_base; | |
27 | void __iomem *ext_base; | |
28 | spinlock_t idm_lock; | |
29 | }; | |
30 | ||
31 | #define IPROC_NAND_CTLR_READY_OFFSET 0x10 | |
32 | #define IPROC_NAND_CTLR_READY BIT(0) | |
33 | ||
34 | #define IPROC_NAND_IO_CTRL_OFFSET 0x00 | |
35 | #define IPROC_NAND_APB_LE_MODE BIT(24) | |
36 | #define IPROC_NAND_INT_CTRL_READ_ENABLE BIT(6) | |
37 | ||
38 | static bool iproc_nand_intc_ack(struct brcmnand_soc *soc) | |
39 | { | |
40 | struct iproc_nand_soc_priv *priv = soc->priv; | |
41 | void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET; | |
42 | u32 val = brcmnand_readl(mmio); | |
43 | ||
44 | if (val & IPROC_NAND_CTLR_READY) { | |
45 | brcmnand_writel(IPROC_NAND_CTLR_READY, mmio); | |
46 | return true; | |
47 | } | |
48 | ||
49 | return false; | |
50 | } | |
51 | ||
52 | static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en) | |
53 | { | |
54 | struct iproc_nand_soc_priv *priv = soc->priv; | |
55 | void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET; | |
56 | u32 val; | |
57 | unsigned long flags; | |
58 | ||
59 | spin_lock_irqsave(&priv->idm_lock, flags); | |
60 | ||
61 | val = brcmnand_readl(mmio); | |
62 | ||
63 | if (en) | |
64 | val |= IPROC_NAND_INT_CTRL_READ_ENABLE; | |
65 | else | |
66 | val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE; | |
67 | ||
68 | brcmnand_writel(val, mmio); | |
69 | ||
70 | spin_unlock_irqrestore(&priv->idm_lock, flags); | |
71 | } | |
72 | ||
73 | static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare) | |
74 | { | |
75 | struct iproc_nand_soc_priv *priv = soc->priv; | |
76 | void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET; | |
77 | u32 val; | |
78 | unsigned long flags; | |
79 | ||
80 | spin_lock_irqsave(&priv->idm_lock, flags); | |
81 | ||
82 | val = brcmnand_readl(mmio); | |
83 | ||
84 | if (prepare) | |
85 | val |= IPROC_NAND_APB_LE_MODE; | |
86 | else | |
87 | val &= ~IPROC_NAND_APB_LE_MODE; | |
88 | ||
89 | brcmnand_writel(val, mmio); | |
90 | ||
91 | spin_unlock_irqrestore(&priv->idm_lock, flags); | |
92 | } | |
93 | ||
94 | static int iproc_nand_probe(struct platform_device *pdev) | |
95 | { | |
96 | struct device *dev = &pdev->dev; | |
97 | struct iproc_nand_soc_priv *priv; | |
98 | struct brcmnand_soc *soc; | |
99 | struct resource *res; | |
100 | ||
101 | soc = devm_kzalloc(dev, sizeof(*soc), GFP_KERNEL); | |
102 | if (!soc) | |
103 | return -ENOMEM; | |
104 | ||
105 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
106 | if (!priv) | |
107 | return -ENOMEM; | |
108 | ||
109 | spin_lock_init(&priv->idm_lock); | |
110 | ||
111 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-idm"); | |
112 | priv->idm_base = devm_ioremap_resource(dev, res); | |
113 | if (IS_ERR(priv->idm_base)) | |
114 | return PTR_ERR(priv->idm_base); | |
115 | ||
116 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-ext"); | |
117 | priv->ext_base = devm_ioremap_resource(dev, res); | |
118 | if (IS_ERR(priv->ext_base)) | |
119 | return PTR_ERR(priv->ext_base); | |
120 | ||
121 | soc->pdev = pdev; | |
122 | soc->priv = priv; | |
123 | soc->ctlrdy_ack = iproc_nand_intc_ack; | |
124 | soc->ctlrdy_set_enabled = iproc_nand_intc_set; | |
125 | soc->prepare_data_bus = iproc_nand_apb_access; | |
126 | ||
127 | return brcmnand_probe(pdev, soc); | |
128 | } | |
129 | ||
130 | static const struct of_device_id iproc_nand_of_match[] = { | |
131 | { .compatible = "brcm,nand-iproc" }, | |
132 | {}, | |
133 | }; | |
134 | MODULE_DEVICE_TABLE(of, iproc_nand_of_match); | |
135 | ||
136 | static struct platform_driver iproc_nand_driver = { | |
137 | .probe = iproc_nand_probe, | |
138 | .remove = brcmnand_remove, | |
139 | .driver = { | |
140 | .name = "iproc_nand", | |
141 | .pm = &brcmnand_pm_ops, | |
142 | .of_match_table = iproc_nand_of_match, | |
143 | } | |
144 | }; | |
145 | module_platform_driver(iproc_nand_driver); | |
146 | ||
147 | MODULE_LICENSE("GPL v2"); | |
148 | MODULE_AUTHOR("Brian Norris"); | |
149 | MODULE_AUTHOR("Ray Jui"); | |
150 | MODULE_DESCRIPTION("NAND driver for Broadcom IPROC-based SoCs"); |