2 * Copyright © 2015 Broadcom Corporation
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.
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.
14 #include <linux/device.h>
16 #include <linux/ioport.h>
17 #include <linux/module.h>
19 #include <linux/of_address.h>
20 #include <linux/platform_device.h>
21 #include <linux/slab.h>
25 struct iproc_nand_soc_priv {
26 void __iomem *idm_base;
27 void __iomem *ext_base;
31 #define IPROC_NAND_CTLR_READY_OFFSET 0x10
32 #define IPROC_NAND_CTLR_READY BIT(0)
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)
38 static bool iproc_nand_intc_ack(struct brcmnand_soc *soc)
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);
44 if (val & IPROC_NAND_CTLR_READY) {
45 brcmnand_writel(IPROC_NAND_CTLR_READY, mmio);
52 static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en)
54 struct iproc_nand_soc_priv *priv = soc->priv;
55 void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
59 spin_lock_irqsave(&priv->idm_lock, flags);
61 val = brcmnand_readl(mmio);
64 val |= IPROC_NAND_INT_CTRL_READ_ENABLE;
66 val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE;
68 brcmnand_writel(val, mmio);
70 spin_unlock_irqrestore(&priv->idm_lock, flags);
73 static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare)
75 struct iproc_nand_soc_priv *priv = soc->priv;
76 void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
80 spin_lock_irqsave(&priv->idm_lock, flags);
82 val = brcmnand_readl(mmio);
85 val |= IPROC_NAND_APB_LE_MODE;
87 val &= ~IPROC_NAND_APB_LE_MODE;
89 brcmnand_writel(val, mmio);
91 spin_unlock_irqrestore(&priv->idm_lock, flags);
94 static int iproc_nand_probe(struct platform_device *pdev)
96 struct device *dev = &pdev->dev;
97 struct iproc_nand_soc_priv *priv;
98 struct brcmnand_soc *soc;
101 soc = devm_kzalloc(dev, sizeof(*soc), GFP_KERNEL);
105 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
109 spin_lock_init(&priv->idm_lock);
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);
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);
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;
127 return brcmnand_probe(pdev, soc);
130 static const struct of_device_id iproc_nand_of_match[] = {
131 { .compatible = "brcm,nand-iproc" },
134 MODULE_DEVICE_TABLE(of, iproc_nand_of_match);
136 static struct platform_driver iproc_nand_driver = {
137 .probe = iproc_nand_probe,
138 .remove = brcmnand_remove,
140 .name = "iproc_nand",
141 .pm = &brcmnand_pm_ops,
142 .of_match_table = iproc_nand_of_match,
145 module_platform_driver(iproc_nand_driver);
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");