bcm63138_nand.c (2377B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright © 2015 Broadcom Corporation 4 */ 5 6#include <linux/device.h> 7#include <linux/io.h> 8#include <linux/ioport.h> 9#include <linux/module.h> 10#include <linux/of.h> 11#include <linux/of_address.h> 12#include <linux/platform_device.h> 13#include <linux/slab.h> 14 15#include "brcmnand.h" 16 17struct bcm63138_nand_soc { 18 struct brcmnand_soc soc; 19 void __iomem *base; 20}; 21 22#define BCM63138_NAND_INT_STATUS 0x00 23#define BCM63138_NAND_INT_EN 0x04 24 25enum { 26 BCM63138_CTLRDY = BIT(4), 27}; 28 29static bool bcm63138_nand_intc_ack(struct brcmnand_soc *soc) 30{ 31 struct bcm63138_nand_soc *priv = 32 container_of(soc, struct bcm63138_nand_soc, soc); 33 void __iomem *mmio = priv->base + BCM63138_NAND_INT_STATUS; 34 u32 val = brcmnand_readl(mmio); 35 36 if (val & BCM63138_CTLRDY) { 37 brcmnand_writel(val & ~BCM63138_CTLRDY, mmio); 38 return true; 39 } 40 41 return false; 42} 43 44static void bcm63138_nand_intc_set(struct brcmnand_soc *soc, bool en) 45{ 46 struct bcm63138_nand_soc *priv = 47 container_of(soc, struct bcm63138_nand_soc, soc); 48 void __iomem *mmio = priv->base + BCM63138_NAND_INT_EN; 49 u32 val = brcmnand_readl(mmio); 50 51 if (en) 52 val |= BCM63138_CTLRDY; 53 else 54 val &= ~BCM63138_CTLRDY; 55 56 brcmnand_writel(val, mmio); 57} 58 59static int bcm63138_nand_probe(struct platform_device *pdev) 60{ 61 struct device *dev = &pdev->dev; 62 struct bcm63138_nand_soc *priv; 63 struct brcmnand_soc *soc; 64 struct resource *res; 65 66 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 67 if (!priv) 68 return -ENOMEM; 69 soc = &priv->soc; 70 71 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-int-base"); 72 priv->base = devm_ioremap_resource(dev, res); 73 if (IS_ERR(priv->base)) 74 return PTR_ERR(priv->base); 75 76 soc->ctlrdy_ack = bcm63138_nand_intc_ack; 77 soc->ctlrdy_set_enabled = bcm63138_nand_intc_set; 78 79 return brcmnand_probe(pdev, soc); 80} 81 82static const struct of_device_id bcm63138_nand_of_match[] = { 83 { .compatible = "brcm,nand-bcm63138" }, 84 {}, 85}; 86MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match); 87 88static struct platform_driver bcm63138_nand_driver = { 89 .probe = bcm63138_nand_probe, 90 .remove = brcmnand_remove, 91 .driver = { 92 .name = "bcm63138_nand", 93 .pm = &brcmnand_pm_ops, 94 .of_match_table = bcm63138_nand_of_match, 95 } 96}; 97module_platform_driver(bcm63138_nand_driver); 98 99MODULE_LICENSE("GPL v2"); 100MODULE_AUTHOR("Brian Norris"); 101MODULE_DESCRIPTION("NAND driver for BCM63138");