cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bcm6368_nand.c (3504B)

      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
     26struct 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
     39enum {
     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
     50static 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
     68static 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
     86static 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
    112static const struct of_device_id bcm6368_nand_of_match[] = {
    113	{ .compatible = "brcm,nand-bcm6368" },
    114	{},
    115};
    116MODULE_DEVICE_TABLE(of, bcm6368_nand_of_match);
    117
    118static 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};
    127module_platform_driver(bcm6368_nand_driver);
    128
    129MODULE_LICENSE("GPL");
    130MODULE_AUTHOR("Simon Arlott");
    131MODULE_DESCRIPTION("NAND driver for BCM6368");