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 { 26 struct brcmnand_soc soc; 27 void __iomem *base; 28 }; 29 30 #define BCM63138_NAND_INT_STATUS 0x00 31 #define BCM63138_NAND_INT_EN 0x04 32 33 enum { 34 BCM63138_CTLRDY = BIT(4), 35 }; 36 37 static bool bcm63138_nand_intc_ack(struct brcmnand_soc *soc) 38 { 39 struct bcm63138_nand_soc *priv = 40 container_of(soc, struct bcm63138_nand_soc, soc); 41 void __iomem *mmio = priv->base + BCM63138_NAND_INT_STATUS; 42 u32 val = brcmnand_readl(mmio); 43 44 if (val & BCM63138_CTLRDY) { 45 brcmnand_writel(val & ~BCM63138_CTLRDY, mmio); 46 return true; 47 } 48 49 return false; 50 } 51 52 static void bcm63138_nand_intc_set(struct brcmnand_soc *soc, bool en) 53 { 54 struct bcm63138_nand_soc *priv = 55 container_of(soc, struct bcm63138_nand_soc, soc); 56 void __iomem *mmio = priv->base + BCM63138_NAND_INT_EN; 57 u32 val = brcmnand_readl(mmio); 58 59 if (en) 60 val |= BCM63138_CTLRDY; 61 else 62 val &= ~BCM63138_CTLRDY; 63 64 brcmnand_writel(val, mmio); 65 } 66 67 static int bcm63138_nand_probe(struct platform_device *pdev) 68 { 69 struct device *dev = &pdev->dev; 70 struct bcm63138_nand_soc *priv; 71 struct brcmnand_soc *soc; 72 struct resource *res; 73 74 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 75 if (!priv) 76 return -ENOMEM; 77 soc = &priv->soc; 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->ctlrdy_ack = bcm63138_nand_intc_ack; 85 soc->ctlrdy_set_enabled = bcm63138_nand_intc_set; 86 87 return brcmnand_probe(pdev, soc); 88 } 89 90 static const struct of_device_id bcm63138_nand_of_match[] = { 91 { .compatible = "brcm,nand-bcm63138" }, 92 {}, 93 }; 94 MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match); 95 96 static struct platform_driver bcm63138_nand_driver = { 97 .probe = bcm63138_nand_probe, 98 .remove = brcmnand_remove, 99 .driver = { 100 .name = "bcm63138_nand", 101 .pm = &brcmnand_pm_ops, 102 .of_match_table = bcm63138_nand_of_match, 103 } 104 }; 105 module_platform_driver(bcm63138_nand_driver); 106 107 MODULE_LICENSE("GPL v2"); 108 MODULE_AUTHOR("Brian Norris"); 109 MODULE_DESCRIPTION("NAND driver for BCM63138"); 110