diff options
Diffstat (limited to 'drivers/spi/spi-iproc-qspi.c')
| -rw-r--r-- | drivers/spi/spi-iproc-qspi.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/spi/spi-iproc-qspi.c b/drivers/spi/spi-iproc-qspi.c new file mode 100644 index 000000000000..be6ccb204a66 --- /dev/null +++ b/drivers/spi/spi-iproc-qspi.c @@ -0,0 +1,163 @@ +/* + * Copyright 2016 Broadcom Limited + * + * 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 "spi-bcm-qspi.h" + +#define INTR_BASE_BIT_SHIFT 0x02 +#define INTR_COUNT 0x07 + +struct bcm_iproc_intc { + struct bcm_qspi_soc_intc soc_intc; + struct platform_device *pdev; + void __iomem *int_reg; + void __iomem *int_status_reg; + spinlock_t soclock; + bool big_endian; +}; + +static u32 bcm_iproc_qspi_get_l2_int_status(struct bcm_qspi_soc_intc *soc_intc) +{ + struct bcm_iproc_intc *priv = + container_of(soc_intc, struct bcm_iproc_intc, soc_intc); + void __iomem *mmio = priv->int_status_reg; + int i; + u32 val = 0, sts = 0; + + for (i = 0; i < INTR_COUNT; i++) { + if (bcm_qspi_readl(priv->big_endian, mmio + (i * 4))) + val |= 1UL << i; + } + + if (val & INTR_MSPI_DONE_MASK) + sts |= MSPI_DONE; + + if (val & BSPI_LR_INTERRUPTS_ALL) + sts |= BSPI_DONE; + + if (val & BSPI_LR_INTERRUPTS_ERROR) + sts |= BSPI_ERR; + + return sts; +} + +static void bcm_iproc_qspi_int_ack(struct bcm_qspi_soc_intc *soc_intc, int type) +{ + struct bcm_iproc_intc *priv = + container_of(soc_intc, struct bcm_iproc_intc, soc_intc); + void __iomem *mmio = priv->int_status_reg; + u32 mask = get_qspi_mask(type); + int i; + + for (i = 0; i < INTR_COUNT; i++) { + if (mask & (1UL << i)) + bcm_qspi_writel(priv->big_endian, 1, mmio + (i * 4)); + } +} + +static void bcm_iproc_qspi_int_set(struct bcm_qspi_soc_intc *soc_intc, int type, + bool en) +{ + struct bcm_iproc_intc *priv = + container_of(soc_intc, struct bcm_iproc_intc, soc_intc); + void __iomem *mmio = priv->int_reg; + u32 mask = get_qspi_mask(type); + u32 val; + unsigned long flags; + + spin_lock_irqsave(&priv->soclock, flags); + + val = bcm_qspi_readl(priv->big_endian, mmio); + + if (en) + val = val | (mask << INTR_BASE_BIT_SHIFT); + else + val = val & ~(mask << INTR_BASE_BIT_SHIFT); + + bcm_qspi_writel(priv->big_endian, val, mmio); + + spin_unlock_irqrestore(&priv->soclock, flags); +} + +static int bcm_iproc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct bcm_iproc_intc *priv; + struct bcm_qspi_soc_intc *soc_intc; + struct resource *res; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + soc_intc = &priv->soc_intc; + priv->pdev = pdev; + + spin_lock_init(&priv->soclock); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr_regs"); + priv->int_reg = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->int_reg)) + return PTR_ERR(priv->int_reg); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "intr_status_reg"); + priv->int_status_reg = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->int_status_reg)) + return PTR_ERR(priv->int_status_reg); + + priv->big_endian = of_device_is_big_endian(dev->of_node); + + bcm_iproc_qspi_int_ack(soc_intc, MSPI_BSPI_DONE); + bcm_iproc_qspi_int_set(soc_intc, MSPI_BSPI_DONE, false); + + soc_intc->bcm_qspi_int_ack = bcm_iproc_qspi_int_ack; + soc_intc->bcm_qspi_int_set = bcm_iproc_qspi_int_set; + soc_intc->bcm_qspi_get_int_status = bcm_iproc_qspi_get_l2_int_status; + + return bcm_qspi_probe(pdev, soc_intc); +} + +static int bcm_iproc_remove(struct platform_device *pdev) +{ + return bcm_qspi_remove(pdev); +} + +static const struct of_device_id bcm_iproc_of_match[] = { + { .compatible = "brcm,spi-nsp-qspi" }, + { .compatible = "brcm,spi-ns2-qspi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm_iproc_of_match); + +static struct platform_driver bcm_iproc_driver = { + .probe = bcm_iproc_probe, + .remove = bcm_iproc_remove, + .driver = { + .name = "bcm_iproc", + .pm = &bcm_qspi_pm_ops, + .of_match_table = bcm_iproc_of_match, + } +}; +module_platform_driver(bcm_iproc_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Kamal Dasu"); +MODULE_DESCRIPTION("SPI flash driver for Broadcom iProc SoCs"); |