LXR linux/drivers/spi/spi-iproc-qspi.c

   1/*
   2 * Copyright 2016 Broadcom Limited
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11 * GNU General Public License for more details.
  12 */
  13
  14#include <linux/device.h>
  15#include <linux/io.h>
  16#include <linux/ioport.h>
  17#include <linux/module.h>
  18#include <linux/of.h>
  19#include <linux/of_address.h>
  20#include <linux/platform_device.h>
  21#include <linux/slab.h>
  22
  23#include "spi-bcm-qspi.h"
  24
  25#define INTR_BASE_BIT_SHIFT                     0x02
  26#define INTR_COUNT                              0x07
  27
  28struct bcm_iproc_intc {
  29        struct bcm_qspi_soc_intc soc_intc;
  30        struct platform_device *pdev;
  31        void __iomem *int_reg;
  32        void __iomem *int_status_reg;
  33        spinlock_t soclock;
  34        bool big_endian;
  35};
  36
  37static u32 bcm_iproc_qspi_get_l2_int_status(struct bcm_qspi_soc_intc *soc_intc)
  38{
  39        struct bcm_iproc_intc *priv =
  40                        container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
  41        void __iomem *mmio = priv->int_status_reg;
  42        int i;
  43        u32 val = 0, sts = 0;
  44
  45        for (i = 0; i < INTR_COUNT; i++) {
  46                if (bcm_qspi_readl(priv->big_endian, mmio + (i * 4)))
  47                        val |= 1UL << i;
  48        }
  49
  50        if (val & INTR_MSPI_DONE_MASK)
  51                sts |= MSPI_DONE;
  52
  53        if (val & BSPI_LR_INTERRUPTS_ALL)
  54                sts |= BSPI_DONE;
  55
  56        if (val & BSPI_LR_INTERRUPTS_ERROR)
  57                sts |= BSPI_ERR;
  58
  59        return sts;
  60}
  61
  62static void bcm_iproc_qspi_int_ack(struct bcm_qspi_soc_intc *soc_intc, int type)
  63{
  64        struct bcm_iproc_intc *priv =
  65                        container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
  66        void __iomem *mmio = priv->int_status_reg;
  67        u32 mask = get_qspi_mask(type);
  68        int i;
  69
  70        for (i = 0; i < INTR_COUNT; i++) {
  71                if (mask & (1UL << i))
  72                        bcm_qspi_writel(priv->big_endian, 1, mmio + (i * 4));
  73        }
  74}
  75
  76static void bcm_iproc_qspi_int_set(struct bcm_qspi_soc_intc *soc_intc, int type,
  77                                   bool en)
  78{
  79        struct bcm_iproc_intc *priv =
  80                        container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
  81        void __iomem *mmio = priv->int_reg;
  82        u32 mask = get_qspi_mask(type);
  83        u32 val;
  84        unsigned long flags;
  85
  86        spin_lock_irqsave(&priv->soclock, flags);
  87
  88        val = bcm_qspi_readl(priv->big_endian, mmio);
  89
  90        if (en)
  91                val = val | (mask << INTR_BASE_BIT_SHIFT);
  92        else
  93                val = val & ~(mask << INTR_BASE_BIT_SHIFT);
  94
  95        bcm_qspi_writel(priv->big_endian, val, mmio);
  96
  97        spin_unlock_irqrestore(&priv->soclock, flags);
  98}
  99
 100static int bcm_iproc_probe(struct platform_device *pdev)
 101{
 102        struct device *dev = &pdev->dev;
 103        struct bcm_iproc_intc *priv;
 104        struct bcm_qspi_soc_intc *soc_intc;
 105        struct resource *res;
 106
 107        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 108        if (!priv)
 109                return -ENOMEM;
 110        soc_intc = &priv->soc_intc;
 111        priv->pdev = pdev;
 112
 113        spin_lock_init(&priv->soclock);
 114
 115        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr_regs");
 116        priv->int_reg = devm_ioremap_resource(dev, res);
 117        if (IS_ERR(priv->int_reg))
 118                return PTR_ERR(priv->int_reg);
 119
 120        res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 121                                           "intr_status_reg");
 122        priv->int_status_reg = devm_ioremap_resource(dev, res);
 123        if (IS_ERR(priv->int_status_reg))
 124                return PTR_ERR(priv->int_status_reg);
 125
 126        priv->big_endian = of_device_is_big_endian(dev->of_node);
 127
 128        bcm_iproc_qspi_int_ack(soc_intc, MSPI_BSPI_DONE);
 129        bcm_iproc_qspi_int_set(soc_intc, MSPI_BSPI_DONE, false);
 130
 131        soc_intc->bcm_qspi_int_ack = bcm_iproc_qspi_int_ack;
 132        soc_intc->bcm_qspi_int_set = bcm_iproc_qspi_int_set;
 133        soc_intc->bcm_qspi_get_int_status = bcm_iproc_qspi_get_l2_int_status;
 134
 135        return bcm_qspi_probe(pdev, soc_intc);
 136}
 137
 138static int bcm_iproc_remove(struct platform_device *pdev)
 139{
 140        return bcm_qspi_remove(pdev);
 141}
 142
 143static const struct of_device_id bcm_iproc_of_match[] = {
 144        { .compatible = "brcm,spi-nsp-qspi" },
 145        { .compatible = "brcm,spi-ns2-qspi" },
 146        {},
 147};
 148MODULE_DEVICE_TABLE(of, bcm_iproc_of_match);
 149
 150static struct platform_driver bcm_iproc_driver = {
 151        .probe                  = bcm_iproc_probe,
 152        .remove                 = bcm_iproc_remove,
 153        .driver = {
 154                .name           = "bcm_iproc",
 155                .pm             = &bcm_qspi_pm_ops,
 156                .of_match_table = bcm_iproc_of_match,
 157        }
 158};
 159module_platform_driver(bcm_iproc_driver);
 160
 161MODULE_LICENSE("GPL v2");
 162MODULE_AUTHOR("Kamal Dasu");
 163MODULE_DESCRIPTION("SPI flash driver for Broadcom iProc SoCs");
 164