projects / deliverable / linux.git / blame
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|---|---|---|
| ca22f040 BN |
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 | ||
| a86c947b BN |
25 | struct iproc_nand_soc { |
| 26 | struct brcmnand_soc soc; | |
| 27 | ||
| ca22f040 BN |
28 | void __iomem *idm_base; |
| 29 | void __iomem *ext_base; | |
| 30 | spinlock_t idm_lock; | |
| 31 | }; | |
| 32 | ||
| 33 | #define IPROC_NAND_CTLR_READY_OFFSET 0x10 | |
| 34 | #define IPROC_NAND_CTLR_READY BIT(0) | |
| 35 | ||
| 36 | #define IPROC_NAND_IO_CTRL_OFFSET 0x00 | |
| 37 | #define IPROC_NAND_APB_LE_MODE BIT(24) | |
| 38 | #define IPROC_NAND_INT_CTRL_READ_ENABLE BIT(6) | |
| 39 | ||
| 40 | static bool iproc_nand_intc_ack(struct brcmnand_soc *soc) | |
| 41 | { | |
| a86c947b BN |
42 | struct iproc_nand_soc *priv = |
| 43 | container_of(soc, struct iproc_nand_soc, soc); | |
| ca22f040 BN |
44 | void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET; |
| 45 | u32 val = brcmnand_readl(mmio); | |
| 46 | ||
| 47 | if (val & IPROC_NAND_CTLR_READY) { | |
| 48 | brcmnand_writel(IPROC_NAND_CTLR_READY, mmio); | |
| 49 | return true; | |
| 50 | } | |
| 51 | ||
| 52 | return false; | |
| 53 | } | |
| 54 | ||
| 55 | static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en) | |
| 56 | { | |
| a86c947b BN |
57 | struct iproc_nand_soc *priv = |
| 58 | container_of(soc, struct iproc_nand_soc, soc); | |
| ca22f040 BN |
59 | void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET; |
| 60 | u32 val; | |
| 61 | unsigned long flags; | |
| 62 | ||
| 63 | spin_lock_irqsave(&priv->idm_lock, flags); | |
| 64 | ||
| 65 | val = brcmnand_readl(mmio); | |
| 66 | ||
| 67 | if (en) | |
| 68 | val |= IPROC_NAND_INT_CTRL_READ_ENABLE; | |
| 69 | else | |
| 70 | val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE; | |
| 71 | ||
| 72 | brcmnand_writel(val, mmio); | |
| 73 | ||
| 74 | spin_unlock_irqrestore(&priv->idm_lock, flags); | |
| 75 | } | |
| 76 | ||
| 77 | static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare) | |
| 78 | { | |
| a86c947b BN |
79 | struct iproc_nand_soc *priv = |
| 80 | container_of(soc, struct iproc_nand_soc, soc); | |
| ca22f040 BN |
81 | void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET; |
| 82 | u32 val; | |
| 83 | unsigned long flags; | |
| 84 | ||
| 85 | spin_lock_irqsave(&priv->idm_lock, flags); | |
| 86 | ||
| 87 | val = brcmnand_readl(mmio); | |
| 88 | ||
| 89 | if (prepare) | |
| 90 | val |= IPROC_NAND_APB_LE_MODE; | |
| 91 | else | |
| 92 | val &= ~IPROC_NAND_APB_LE_MODE; | |
| 93 | ||
| 94 | brcmnand_writel(val, mmio); | |
| 95 | ||
| 96 | spin_unlock_irqrestore(&priv->idm_lock, flags); | |
| 97 | } | |
| 98 | ||
| 99 | static int iproc_nand_probe(struct platform_device *pdev) | |
| 100 | { | |
| 101 | struct device *dev = &pdev->dev; | |
| a86c947b | 102 | struct iproc_nand_soc *priv; |
| ca22f040 BN |
103 | struct brcmnand_soc *soc; |
| 104 | struct resource *res; | |
| 105 | ||
| ca22f040 BN |
106 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
| 107 | if (!priv) | |
| 108 | return -ENOMEM; | |
| a86c947b | 109 | soc = &priv->soc; |
| ca22f040 BN |
110 | |
| 111 | spin_lock_init(&priv->idm_lock); | |
| 112 | ||
| 113 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-idm"); | |
| 114 | priv->idm_base = devm_ioremap_resource(dev, res); | |
| 115 | if (IS_ERR(priv->idm_base)) | |
| 116 | return PTR_ERR(priv->idm_base); | |
| 117 | ||
| 118 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-ext"); | |
| 119 | priv->ext_base = devm_ioremap_resource(dev, res); | |
| 120 | if (IS_ERR(priv->ext_base)) | |
| 121 | return PTR_ERR(priv->ext_base); | |
| 122 | ||
| ca22f040 BN |
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"); |