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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright © 2015 Broadcom Corporation4 */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 bcmbca_nand_soc {18 struct brcmnand_soc soc;19 void __iomem *base;20};21 22#define BCMBCA_NAND_INT_STATUS 0x0023#define BCMBCA_NAND_INT_EN 0x0424 25enum {26 BCMBCA_CTLRDY = BIT(4),27};28 29#if defined(CONFIG_ARM64)30#define ALIGN_REQ 831#else32#define ALIGN_REQ 433#endif34 35static inline bool bcmbca_nand_is_buf_aligned(void *flash_cache, void *buffer)36{37 return IS_ALIGNED((uintptr_t)buffer, ALIGN_REQ) &&38 IS_ALIGNED((uintptr_t)flash_cache, ALIGN_REQ);39}40 41static bool bcmbca_nand_intc_ack(struct brcmnand_soc *soc)42{43 struct bcmbca_nand_soc *priv =44 container_of(soc, struct bcmbca_nand_soc, soc);45 void __iomem *mmio = priv->base + BCMBCA_NAND_INT_STATUS;46 u32 val = brcmnand_readl(mmio);47 48 if (val & BCMBCA_CTLRDY) {49 brcmnand_writel(val & ~BCMBCA_CTLRDY, mmio);50 return true;51 }52 53 return false;54}55 56static void bcmbca_nand_intc_set(struct brcmnand_soc *soc, bool en)57{58 struct bcmbca_nand_soc *priv =59 container_of(soc, struct bcmbca_nand_soc, soc);60 void __iomem *mmio = priv->base + BCMBCA_NAND_INT_EN;61 u32 val = brcmnand_readl(mmio);62 63 if (en)64 val |= BCMBCA_CTLRDY;65 else66 val &= ~BCMBCA_CTLRDY;67 68 brcmnand_writel(val, mmio);69}70 71static void bcmbca_read_data_bus(struct brcmnand_soc *soc,72 void __iomem *flash_cache, u32 *buffer, int fc_words)73{74 /*75 * memcpy can do unaligned aligned access depending on source76 * and dest address, which is incompatible with nand cache. Fallback77 * to the memcpy_fromio in such case78 */79 if (bcmbca_nand_is_buf_aligned((void __force *)flash_cache, buffer))80 memcpy((void *)buffer, (void __force *)flash_cache, fc_words * 4);81 else82 memcpy_fromio((void *)buffer, flash_cache, fc_words * 4);83}84 85static int bcmbca_nand_probe(struct platform_device *pdev)86{87 struct device *dev = &pdev->dev;88 struct bcmbca_nand_soc *priv;89 struct brcmnand_soc *soc;90 91 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);92 if (!priv)93 return -ENOMEM;94 soc = &priv->soc;95 96 priv->base = devm_platform_ioremap_resource_byname(pdev, "nand-int-base");97 if (IS_ERR(priv->base))98 return PTR_ERR(priv->base);99 100 soc->ctlrdy_ack = bcmbca_nand_intc_ack;101 soc->ctlrdy_set_enabled = bcmbca_nand_intc_set;102 soc->read_data_bus = bcmbca_read_data_bus;103 104 return brcmnand_probe(pdev, soc);105}106 107static const struct of_device_id bcmbca_nand_of_match[] = {108 { .compatible = "brcm,nand-bcm63138" },109 {},110};111MODULE_DEVICE_TABLE(of, bcmbca_nand_of_match);112 113static struct platform_driver bcmbca_nand_driver = {114 .probe = bcmbca_nand_probe,115 .remove_new = brcmnand_remove,116 .driver = {117 .name = "bcmbca_nand",118 .pm = &brcmnand_pm_ops,119 .of_match_table = bcmbca_nand_of_match,120 }121};122module_platform_driver(bcmbca_nand_driver);123 124MODULE_LICENSE("GPL v2");125MODULE_AUTHOR("Brian Norris");126MODULE_DESCRIPTION("NAND driver for BCMBCA");127