| Brian Norris | f628ece | 2015-05-12 12:13:14 -0700 | [diff] [blame^] | 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 bcm63138_nand_soc_priv { |
| 26 | void __iomem *base; |
| 27 | }; |
| 28 | |
| 29 | #define BCM63138_NAND_INT_STATUS 0x00 |
| 30 | #define BCM63138_NAND_INT_EN 0x04 |
| 31 | |
| 32 | enum { |
| 33 | BCM63138_CTLRDY = BIT(4), |
| 34 | }; |
| 35 | |
| 36 | static bool bcm63138_nand_intc_ack(struct brcmnand_soc *soc) |
| 37 | { |
| 38 | struct bcm63138_nand_soc_priv *priv = soc->priv; |
| 39 | void __iomem *mmio = priv->base + BCM63138_NAND_INT_STATUS; |
| 40 | u32 val = brcmnand_readl(mmio); |
| 41 | |
| 42 | if (val & BCM63138_CTLRDY) { |
| 43 | brcmnand_writel(val & ~BCM63138_CTLRDY, mmio); |
| 44 | return true; |
| 45 | } |
| 46 | |
| 47 | return false; |
| 48 | } |
| 49 | |
| 50 | static void bcm63138_nand_intc_set(struct brcmnand_soc *soc, bool en) |
| 51 | { |
| 52 | struct bcm63138_nand_soc_priv *priv = soc->priv; |
| 53 | void __iomem *mmio = priv->base + BCM63138_NAND_INT_EN; |
| 54 | u32 val = brcmnand_readl(mmio); |
| 55 | |
| 56 | if (en) |
| 57 | val |= BCM63138_CTLRDY; |
| 58 | else |
| 59 | val &= ~BCM63138_CTLRDY; |
| 60 | |
| 61 | brcmnand_writel(val, mmio); |
| 62 | } |
| 63 | |
| 64 | static int bcm63138_nand_probe(struct platform_device *pdev) |
| 65 | { |
| 66 | struct device *dev = &pdev->dev; |
| 67 | struct bcm63138_nand_soc_priv *priv; |
| 68 | struct brcmnand_soc *soc; |
| 69 | struct resource *res; |
| 70 | |
| 71 | soc = devm_kzalloc(dev, sizeof(*soc), GFP_KERNEL); |
| 72 | if (!soc) |
| 73 | return -ENOMEM; |
| 74 | |
| 75 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
| 76 | if (!priv) |
| 77 | return -ENOMEM; |
| 78 | |
| 79 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-int-base"); |
| 80 | priv->base = devm_ioremap_resource(dev, res); |
| 81 | if (IS_ERR(priv->base)) |
| 82 | return PTR_ERR(priv->base); |
| 83 | |
| 84 | soc->pdev = pdev; |
| 85 | soc->priv = priv; |
| 86 | soc->ctlrdy_ack = bcm63138_nand_intc_ack; |
| 87 | soc->ctlrdy_set_enabled = bcm63138_nand_intc_set; |
| 88 | |
| 89 | return brcmnand_probe(pdev, soc); |
| 90 | } |
| 91 | |
| 92 | static const struct of_device_id bcm63138_nand_of_match[] = { |
| 93 | { .compatible = "brcm,nand-bcm63138" }, |
| 94 | {}, |
| 95 | }; |
| 96 | MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match); |
| 97 | |
| 98 | static struct platform_driver bcm63138_nand_driver = { |
| 99 | .probe = bcm63138_nand_probe, |
| 100 | .remove = brcmnand_remove, |
| 101 | .driver = { |
| 102 | .name = "bcm63138_nand", |
| 103 | .pm = &brcmnand_pm_ops, |
| 104 | .of_match_table = bcm63138_nand_of_match, |
| 105 | } |
| 106 | }; |
| 107 | module_platform_driver(bcm63138_nand_driver); |
| 108 | |
| 109 | MODULE_LICENSE("GPL v2"); |
| 110 | MODULE_AUTHOR("Brian Norris"); |
| 111 | MODULE_DESCRIPTION("NAND driver for BCM63138"); |