1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2015 Simon Arlott 4 * 5 * Derived from bcm63138_nand.c: 6 * Copyright © 2015 Broadcom Corporation 7 * 8 * Derived from bcm963xx_4.12L.06B_consumer/shared/opensource/include/bcm963xx/63268_map_part.h: 9 * Copyright 2000-2010 Broadcom Corporation 10 * 11 * Derived from bcm963xx_4.12L.06B_consumer/shared/opensource/flash/nandflash.c: 12 * Copyright 2000-2010 Broadcom Corporation 13 */ 14 15 #include <linux/device.h> 16 #include <linux/io.h> 17 #include <linux/ioport.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/of_address.h> 21 #include <linux/platform_device.h> 22 #include <linux/slab.h> 23 24 #include "brcmnand.h" 25 26 struct bcm6368_nand_soc { 27 struct brcmnand_soc soc; 28 void __iomem *base; 29 }; 30 31 #define BCM6368_NAND_INT 0x00 32 #define BCM6368_NAND_STATUS_SHIFT 0 33 #define BCM6368_NAND_STATUS_MASK (0xfff << BCM6368_NAND_STATUS_SHIFT) 34 #define BCM6368_NAND_ENABLE_SHIFT 16 35 #define BCM6368_NAND_ENABLE_MASK (0xffff << BCM6368_NAND_ENABLE_SHIFT) 36 #define BCM6368_NAND_BASE_ADDR0 0x04 37 #define BCM6368_NAND_BASE_ADDR1 0x0c 38 39 enum { 40 BCM6368_NP_READ = BIT(0), 41 BCM6368_BLOCK_ERASE = BIT(1), 42 BCM6368_COPY_BACK = BIT(2), 43 BCM6368_PAGE_PGM = BIT(3), 44 BCM6368_CTRL_READY = BIT(4), 45 BCM6368_DEV_RBPIN = BIT(5), 46 BCM6368_ECC_ERR_UNC = BIT(6), 47 BCM6368_ECC_ERR_CORR = BIT(7), 48 }; 49 50 static bool bcm6368_nand_intc_ack(struct brcmnand_soc *soc) 51 { 52 struct bcm6368_nand_soc *priv = 53 container_of(soc, struct bcm6368_nand_soc, soc); 54 void __iomem *mmio = priv->base + BCM6368_NAND_INT; 55 u32 val = brcmnand_readl(mmio); 56 57 if (val & (BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT)) { 58 /* Ack interrupt */ 59 val &= ~BCM6368_NAND_STATUS_MASK; 60 val |= BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT; 61 brcmnand_writel(val, mmio); 62 return true; 63 } 64 65 return false; 66 } 67 68 static void bcm6368_nand_intc_set(struct brcmnand_soc *soc, bool en) 69 { 70 struct bcm6368_nand_soc *priv = 71 container_of(soc, struct bcm6368_nand_soc, soc); 72 void __iomem *mmio = priv->base + BCM6368_NAND_INT; 73 u32 val = brcmnand_readl(mmio); 74 75 /* Don't ack any interrupts */ 76 val &= ~BCM6368_NAND_STATUS_MASK; 77 78 if (en) 79 val |= BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT; 80 else 81 val &= ~(BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT); 82 83 brcmnand_writel(val, mmio); 84 } 85 86 static int bcm6368_nand_probe(struct platform_device *pdev) 87 { 88 struct device *dev = &pdev->dev; 89 struct bcm6368_nand_soc *priv; 90 struct brcmnand_soc *soc; 91 92 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 93 if (!priv) 94 return -ENOMEM; 95 soc = &priv->soc; 96 97 priv->base = devm_platform_ioremap_resource_byname(pdev, "nand-int-base"); 98 if (IS_ERR(priv->base)) 99 return PTR_ERR(priv->base); 100 101 soc->ctlrdy_ack = bcm6368_nand_intc_ack; 102 soc->ctlrdy_set_enabled = bcm6368_nand_intc_set; 103 104 /* Disable and ack all interrupts */ 105 brcmnand_writel(0, priv->base + BCM6368_NAND_INT); 106 brcmnand_writel(BCM6368_NAND_STATUS_MASK, 107 priv->base + BCM6368_NAND_INT); 108 109 return brcmnand_probe(pdev, soc); 110 } 111 112 static const struct of_device_id bcm6368_nand_of_match[] = { 113 { .compatible = "brcm,nand-bcm6368" }, 114 {}, 115 }; 116 MODULE_DEVICE_TABLE(of, bcm6368_nand_of_match); 117 118 static struct platform_driver bcm6368_nand_driver = { 119 .probe = bcm6368_nand_probe, 120 .remove = brcmnand_remove, 121 .driver = { 122 .name = "bcm6368_nand", 123 .pm = &brcmnand_pm_ops, 124 .of_match_table = bcm6368_nand_of_match, 125 } 126 }; 127 module_platform_driver(bcm6368_nand_driver); 128 129 MODULE_LICENSE("GPL"); 130 MODULE_AUTHOR("Simon Arlott"); 131 MODULE_DESCRIPTION("NAND driver for BCM6368"); 132