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152 lines
3.8 KiB
152 lines
3.8 KiB
// 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 iproc_nand_soc { |
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struct brcmnand_soc soc; |
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void __iomem *idm_base; |
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void __iomem *ext_base; |
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spinlock_t idm_lock; |
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}; |
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#define IPROC_NAND_CTLR_READY_OFFSET 0x10 |
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#define IPROC_NAND_CTLR_READY BIT(0) |
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#define IPROC_NAND_IO_CTRL_OFFSET 0x00 |
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#define IPROC_NAND_APB_LE_MODE BIT(24) |
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#define IPROC_NAND_INT_CTRL_READ_ENABLE BIT(6) |
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static bool iproc_nand_intc_ack(struct brcmnand_soc *soc) |
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{ |
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struct iproc_nand_soc *priv = |
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container_of(soc, struct iproc_nand_soc, soc); |
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void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET; |
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u32 val = brcmnand_readl(mmio); |
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if (val & IPROC_NAND_CTLR_READY) { |
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brcmnand_writel(IPROC_NAND_CTLR_READY, 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 iproc_nand_intc_set(struct brcmnand_soc *soc, bool en) |
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{ |
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struct iproc_nand_soc *priv = |
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container_of(soc, struct iproc_nand_soc, soc); |
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void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET; |
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u32 val; |
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unsigned long flags; |
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spin_lock_irqsave(&priv->idm_lock, flags); |
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val = brcmnand_readl(mmio); |
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if (en) |
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val |= IPROC_NAND_INT_CTRL_READ_ENABLE; |
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else |
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val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE; |
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brcmnand_writel(val, mmio); |
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spin_unlock_irqrestore(&priv->idm_lock, flags); |
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} |
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static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare, |
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bool is_param) |
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{ |
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struct iproc_nand_soc *priv = |
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container_of(soc, struct iproc_nand_soc, soc); |
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void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET; |
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u32 val; |
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unsigned long flags; |
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spin_lock_irqsave(&priv->idm_lock, flags); |
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val = brcmnand_readl(mmio); |
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/* |
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* In the case of BE or when dealing with NAND data, alway configure |
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* the APB bus to LE mode before accessing the FIFO and back to BE mode |
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* after the access is done |
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*/ |
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if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) || !is_param) { |
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if (prepare) |
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val |= IPROC_NAND_APB_LE_MODE; |
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else |
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val &= ~IPROC_NAND_APB_LE_MODE; |
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} else { /* when in LE accessing the parameter page, keep APB in BE */ |
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val &= ~IPROC_NAND_APB_LE_MODE; |
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} |
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brcmnand_writel(val, mmio); |
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spin_unlock_irqrestore(&priv->idm_lock, flags); |
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} |
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static int iproc_nand_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct iproc_nand_soc *priv; |
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struct brcmnand_soc *soc; |
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struct resource *res; |
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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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spin_lock_init(&priv->idm_lock); |
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-idm"); |
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priv->idm_base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(priv->idm_base)) |
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return PTR_ERR(priv->idm_base); |
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-ext"); |
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priv->ext_base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(priv->ext_base)) |
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return PTR_ERR(priv->ext_base); |
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soc->ctlrdy_ack = iproc_nand_intc_ack; |
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soc->ctlrdy_set_enabled = iproc_nand_intc_set; |
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soc->prepare_data_bus = iproc_nand_apb_access; |
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return brcmnand_probe(pdev, soc); |
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} |
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static const struct of_device_id iproc_nand_of_match[] = { |
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{ .compatible = "brcm,nand-iproc" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, iproc_nand_of_match); |
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static struct platform_driver iproc_nand_driver = { |
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.probe = iproc_nand_probe, |
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.remove = brcmnand_remove, |
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.driver = { |
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.name = "iproc_nand", |
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.pm = &brcmnand_pm_ops, |
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.of_match_table = iproc_nand_of_match, |
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} |
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}; |
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module_platform_driver(iproc_nand_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Brian Norris"); |
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MODULE_AUTHOR("Ray Jui"); |
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MODULE_DESCRIPTION("NAND driver for Broadcom IPROC-based SoCs");
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