diff options
Diffstat (limited to 'drivers/mtd/nand/brcmnand')
| -rw-r--r-- | drivers/mtd/nand/brcmnand/Makefile | 3 | ||||
| -rw-r--r-- | drivers/mtd/nand/brcmnand/iproc_nand.c | 150 |
2 files changed, 153 insertions, 0 deletions
diff --git a/drivers/mtd/nand/brcmnand/Makefile b/drivers/mtd/nand/brcmnand/Makefile index ef47c280f5c0..4e1e65e40598 100644 --- a/drivers/mtd/nand/brcmnand/Makefile +++ b/drivers/mtd/nand/brcmnand/Makefile @@ -1,2 +1,5 @@ +# link order matters; don't link the more generic brcmstb_nand.o before the +# more specific iproc_nand.o, for instance +obj-$(CONFIG_MTD_NAND_BRCMNAND) += iproc_nand.o obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmstb_nand.o obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand.o diff --git a/drivers/mtd/nand/brcmnand/iproc_nand.c b/drivers/mtd/nand/brcmnand/iproc_nand.c new file mode 100644 index 000000000000..683495c74620 --- /dev/null +++ b/drivers/mtd/nand/brcmnand/iproc_nand.c @@ -0,0 +1,150 @@ +/* + * Copyright © 2015 Broadcom Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/device.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include "brcmnand.h" + +struct iproc_nand_soc_priv { + void __iomem *idm_base; + void __iomem *ext_base; + spinlock_t idm_lock; +}; + +#define IPROC_NAND_CTLR_READY_OFFSET 0x10 +#define IPROC_NAND_CTLR_READY BIT(0) + +#define IPROC_NAND_IO_CTRL_OFFSET 0x00 +#define IPROC_NAND_APB_LE_MODE BIT(24) +#define IPROC_NAND_INT_CTRL_READ_ENABLE BIT(6) + +static bool iproc_nand_intc_ack(struct brcmnand_soc *soc) +{ + struct iproc_nand_soc_priv *priv = soc->priv; + void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET; + u32 val = brcmnand_readl(mmio); + + if (val & IPROC_NAND_CTLR_READY) { + brcmnand_writel(IPROC_NAND_CTLR_READY, mmio); + return true; + } + + return false; +} + +static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en) +{ + struct iproc_nand_soc_priv *priv = soc->priv; + void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET; + u32 val; + unsigned long flags; + + spin_lock_irqsave(&priv->idm_lock, flags); + + val = brcmnand_readl(mmio); + + if (en) + val |= IPROC_NAND_INT_CTRL_READ_ENABLE; + else + val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE; + + brcmnand_writel(val, mmio); + + spin_unlock_irqrestore(&priv->idm_lock, flags); +} + +static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare) +{ + struct iproc_nand_soc_priv *priv = soc->priv; + void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET; + u32 val; + unsigned long flags; + + spin_lock_irqsave(&priv->idm_lock, flags); + + val = brcmnand_readl(mmio); + + if (prepare) + val |= IPROC_NAND_APB_LE_MODE; + else + val &= ~IPROC_NAND_APB_LE_MODE; + + brcmnand_writel(val, mmio); + + spin_unlock_irqrestore(&priv->idm_lock, flags); +} + +static int iproc_nand_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct iproc_nand_soc_priv *priv; + struct brcmnand_soc *soc; + struct resource *res; + + soc = devm_kzalloc(dev, sizeof(*soc), GFP_KERNEL); + if (!soc) + return -ENOMEM; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + spin_lock_init(&priv->idm_lock); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-idm"); + priv->idm_base = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->idm_base)) + return PTR_ERR(priv->idm_base); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-ext"); + priv->ext_base = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->ext_base)) + return PTR_ERR(priv->ext_base); + + soc->pdev = pdev; + soc->priv = priv; + soc->ctlrdy_ack = iproc_nand_intc_ack; + soc->ctlrdy_set_enabled = iproc_nand_intc_set; + soc->prepare_data_bus = iproc_nand_apb_access; + + return brcmnand_probe(pdev, soc); +} + +static const struct of_device_id iproc_nand_of_match[] = { + { .compatible = "brcm,nand-iproc" }, + {}, +}; +MODULE_DEVICE_TABLE(of, iproc_nand_of_match); + +static struct platform_driver iproc_nand_driver = { + .probe = iproc_nand_probe, + .remove = brcmnand_remove, + .driver = { + .name = "iproc_nand", + .pm = &brcmnand_pm_ops, + .of_match_table = iproc_nand_of_match, + } +}; +module_platform_driver(iproc_nand_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Brian Norris"); +MODULE_AUTHOR("Ray Jui"); +MODULE_DESCRIPTION("NAND driver for Broadcom IPROC-based SoCs"); |