linux-imx

/*

 * Freescale SCFG MSI(-X) support

 *

 * Copyright (C) 2016 Freescale Semiconductor.

 *

 * Author: Minghuan Lian <Minghuan.Lian@nxp.com>

 *

 * 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.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/msi.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/irqchip/chained_irq.h>

#include <linux/irqdomain.h>

#include <linux/of_irq.h>

#include <linux/of_pci.h>

#include <linux/of_platform.h>

#include <linux/spinlock.h>

#include <linux/dma-iommu.h>

​

#define MSI_IRQS_PER_MSIR   32

#define MSI_MSIR_OFFSET     4

​

#define MSI_LS1043V1_1_IRQS_PER_MSIR    8

#define MSI_LS1043V1_1_MSIR_OFFSET  0x10

​

struct ls_scfg_msi_cfg {

    u32 ibs_shift; /* Shift of interrupt bit select */

    u32 msir_irqs; /* The irq number per MSIR */

    u32 msir_base; /* The base address of MSIR */

};

​

struct ls_scfg_msir {

    struct ls_scfg_msi *msi_data;

    unsigned int index;

    unsigned int gic_irq;

    unsigned int bit_start;

    unsigned int bit_end;

    unsigned int srs; /* Shared interrupt register select */

    void __iomem *reg;

};

​

struct ls_scfg_msi {

    spinlock_t      lock;

    struct platform_device  *pdev;

    struct irq_domain   *parent;

    struct irq_domain   *msi_domain;

    void __iomem        *regs;

    phys_addr_t     msiir_addr;

    struct ls_scfg_msi_cfg  *cfg;

    u32         msir_num;

    struct ls_scfg_msir *msir;

    u32         irqs_num;

    unsigned long       *used;

};

​

static struct irq_chip ls_scfg_msi_irq_chip = {

    .name = "MSI",

    .irq_mask   = pci_msi_mask_irq,

    .irq_unmask = pci_msi_unmask_irq,

};

​

static struct msi_domain_info ls_scfg_msi_domain_info = {

    .flags  = (MSI_FLAG_USE_DEF_DOM_OPS |

           MSI_FLAG_USE_DEF_CHIP_OPS |

           MSI_FLAG_PCI_MSIX),

    .chip   = &ls_scfg_msi_irq_chip,

};

​

static int msi_affinity_flag = 1;

​

static int __init early_parse_ls_scfg_msi(char *p)

{

    if (p && strncmp(p, "no-affinity", 11) == 0)

        msi_affinity_flag = 0;

    else

        msi_affinity_flag = 1;

​

    return 0;

}

early_param("lsmsi", early_parse_ls_scfg_msi);

​

static void ls_scfg_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)

{

    struct ls_scfg_msi *msi_data = irq_data_get_irq_chip_data(data);

​

    msg->address_hi = upper_32_bits(msi_data->msiir_addr);