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");