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
  28 struct 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
  37 static 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
  62 static 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
  76 static 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
 100 static 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
 138 static int bcm_iproc_remove(struct platform_device *pdev)
 139 {
 140         return bcm_qspi_remove(pdev);
 141 }
 142
 143 static const struct of_device_id bcm_iproc_of_match[] = {
 144         { .compatible = "brcm,spi-nsp-qspi" },
 145         { .compatible = "brcm,spi-ns2-qspi" },
 146         {},
 147 };
 148 MODULE_DEVICE_TABLE(of, bcm_iproc_of_match);
 149
 150 static 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 };
 159 module_platform_driver(bcm_iproc_driver);
 160
 161 MODULE_LICENSE("GPL v2");
 162 MODULE_AUTHOR("Kamal Dasu");
 163 MODULE_DESCRIPTION("SPI flash driver for Broadcom iProc SoCs");