127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright © 2015 Broadcom Corporation
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*/
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "brcmnand.h"
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struct bcmbca_nand_soc {
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struct brcmnand_soc soc;
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void __iomem *base;
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};
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#define BCMBCA_NAND_INT_STATUS 0x00
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#define BCMBCA_NAND_INT_EN 0x04
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enum {
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BCMBCA_CTLRDY = BIT(4),
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};
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#if defined(CONFIG_ARM64)
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#define ALIGN_REQ 8
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#else
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#define ALIGN_REQ 4
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#endif
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static inline bool bcmbca_nand_is_buf_aligned(void *flash_cache, void *buffer)
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{
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return IS_ALIGNED((uintptr_t)buffer, ALIGN_REQ) &&
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IS_ALIGNED((uintptr_t)flash_cache, ALIGN_REQ);
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}
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static bool bcmbca_nand_intc_ack(struct brcmnand_soc *soc)
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{
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struct bcmbca_nand_soc *priv =
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container_of(soc, struct bcmbca_nand_soc, soc);
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void __iomem *mmio = priv->base + BCMBCA_NAND_INT_STATUS;
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u32 val = brcmnand_readl(mmio);
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if (val & BCMBCA_CTLRDY) {
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brcmnand_writel(val & ~BCMBCA_CTLRDY, mmio);
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return true;
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}
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return false;
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}
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static void bcmbca_nand_intc_set(struct brcmnand_soc *soc, bool en)
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{
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struct bcmbca_nand_soc *priv =
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container_of(soc, struct bcmbca_nand_soc, soc);
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void __iomem *mmio = priv->base + BCMBCA_NAND_INT_EN;
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u32 val = brcmnand_readl(mmio);
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if (en)
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val |= BCMBCA_CTLRDY;
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else
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val &= ~BCMBCA_CTLRDY;
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brcmnand_writel(val, mmio);
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}
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static void bcmbca_read_data_bus(struct brcmnand_soc *soc,
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void __iomem *flash_cache, u32 *buffer, int fc_words)
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{
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/*
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* memcpy can do unaligned aligned access depending on source
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* and dest address, which is incompatible with nand cache. Fallback
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* to the memcpy_fromio in such case
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*/
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if (bcmbca_nand_is_buf_aligned((void __force *)flash_cache, buffer))
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memcpy((void *)buffer, (void __force *)flash_cache, fc_words * 4);
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else
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memcpy_fromio((void *)buffer, flash_cache, fc_words * 4);
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}
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static int bcmbca_nand_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct bcmbca_nand_soc *priv;
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struct brcmnand_soc *soc;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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soc = &priv->soc;
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priv->base = devm_platform_ioremap_resource_byname(pdev, "nand-int-base");
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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soc->ctlrdy_ack = bcmbca_nand_intc_ack;
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soc->ctlrdy_set_enabled = bcmbca_nand_intc_set;
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soc->read_data_bus = bcmbca_read_data_bus;
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return brcmnand_probe(pdev, soc);
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}
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static const struct of_device_id bcmbca_nand_of_match[] = {
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{ .compatible = "brcm,nand-bcm63138" },
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{},
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};
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MODULE_DEVICE_TABLE(of, bcmbca_nand_of_match);
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static struct platform_driver bcmbca_nand_driver = {
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.probe = bcmbca_nand_probe,
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.remove = brcmnand_remove,
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.driver = {
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.name = "bcmbca_nand",
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.pm = &brcmnand_pm_ops,
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.of_match_table = bcmbca_nand_of_match,
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}
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};
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module_platform_driver(bcmbca_nand_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Brian Norris");
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MODULE_DESCRIPTION("NAND driver for BCMBCA");
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