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// SPDX-License-Identifier: GPL-2.0
/* Marvell Loki driver
*
* Copyright (C) 2018 Marvell International Ltd.
*
* 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/io.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#define PCI_DEVICE_ID_BPHY 0xA089
#define PSM_GPINT0_SUM_W1C 0x0ULL
#define PSM_GPINT0_SUM_W1S 0x40ULL
#define PSM_GPINT0_ENA_W1C 0x80ULL
#define PSM_GPINT0_ENA_W1S 0xC0ULL
#define CPRI_INT_MASK 0x1F
#define CPRI_IP_AXI_INT_STATUS(a) (0x100ULL | a << 10)
#define CPRI_IP_AXI_INT(a) (0x108ULL | a << 10)
struct mrvl_loki {
struct pci_dev *pdev;
struct msix_entry msix_ent;
void __iomem *psm_gpint;
void __iomem *cpri_axi[3];
int intr_num;
int (*irq_cb)(uint32_t instance, uint32_t pss_int);
};
struct mrvl_loki *g_ml;
int mrvl_loki_register_irq_cb(int (*func)(uint32_t instance, uint32_t pss_int))
{
if (!g_ml) {
pr_err("Error: mrvl_loki is NULL\n");
return -ENOENT;
}
if (func)
g_ml->irq_cb = func;
else
return -EIO;
return 0;
}
EXPORT_SYMBOL(mrvl_loki_register_irq_cb);
void mrvl_loki_unregister_irq_cb(void)
{
g_ml->irq_cb = NULL;
}
EXPORT_SYMBOL(mrvl_loki_unregister_irq_cb);
static irqreturn_t mrvl_loki_handler(int irq, void *dev)
{
struct mrvl_loki *ml =
platform_get_drvdata((struct platform_device *)dev);
uint32_t instance, pss_int, val;
uint8_t cpri, mac;
int ret;
val = readq_relaxed(ml->psm_gpint + PSM_GPINT0_SUM_W1C) & CPRI_INT_MASK;
instance = ffs(val) - 1;
cpri = instance / 2;
mac = instance % 2;
pss_int = (u32)readq_relaxed(ml->cpri_axi[cpri] +
CPRI_IP_AXI_INT_STATUS(mac));
if (ml->irq_cb) {
ret = ml->irq_cb(instance, pss_int);
if (ret < 0)
dev_err(dev, "Error %d from loki CPRI callback\n", ret);
}
writeq_relaxed(val, ml->psm_gpint + PSM_GPINT0_SUM_W1C);
writeq_relaxed((u64)pss_int, ml->cpri_axi[cpri] + CPRI_IP_AXI_INT(mac));
return IRQ_HANDLED;
};
static inline void msix_enable_ctrl(struct pci_dev *dev)
{
u16 control;
pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
control |= PCI_MSIX_FLAGS_ENABLE;
pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, control);
}
static int mrvl_loki_probe(struct platform_device *pdev)
{
struct mrvl_loki *ml;
struct device *dev = &pdev->dev;
struct pci_dev *bphy_pdev;
struct resource *res;
int ret = 0;
ml = devm_kzalloc(dev, sizeof(*ml), GFP_KERNEL);
if (!ml)
return -ENOMEM;
platform_set_drvdata(pdev, ml);
/*
* BPHY is a PCI device and the kernel resets the MSIXEN bit during
* enumeration. So enable it back for interrupts to be generated.
*/
bphy_pdev = pci_get_device(PCI_VENDOR_ID_CAVIUM, PCI_DEVICE_ID_BPHY,
NULL);
if (!bphy_pdev) {
dev_err(dev, "Couldn't find BPHY PCI device %x\n",
PCI_DEVICE_ID_BPHY);
ret = -ENODEV;
goto err;
}
ml->pdev = bphy_pdev;
ml->msix_ent.entry = 0;
msix_enable_ctrl(bphy_pdev);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ml->psm_gpint = ioremap(res->start, resource_size(res));
if (IS_ERR(ml->psm_gpint)) {
dev_err(dev, "error in ioremap PSM GPINT\n");
return PTR_ERR(ml->psm_gpint);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
ml->cpri_axi[0] = ioremap(res->start, resource_size(res));
if (IS_ERR(ml->cpri_axi[0])) {
dev_err(dev, "error in ioremap CPRI AXI0\n");
return PTR_ERR(ml->cpri_axi[0]);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
ml->cpri_axi[1] = ioremap(res->start, resource_size(res));
if (IS_ERR(ml->cpri_axi[1])) {
dev_err(dev, "error in ioremap CPRI AXI1\n");
return PTR_ERR(ml->cpri_axi[1]);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
ml->cpri_axi[2] = ioremap(res->start, resource_size(res));
if (IS_ERR(ml->cpri_axi[2])) {
dev_err(dev, "error in ioremap CPRI AXI2\n");
return PTR_ERR(ml->cpri_axi[2]);
}
/* register interrupt */
ml->intr_num = irq_of_parse_and_map(dev->of_node, 0);
if (request_irq(ml->intr_num, mrvl_loki_handler, 0,
"mrvl loki handler", pdev)) {
dev_err(dev, "failed to register irq handler\n");
ret = -ENOMEM;
goto err;
}
g_ml = ml;
dev_info(dev, "Registered interrupt handler for %d\n", ml->intr_num);
return 0;
err:
devm_kfree(&pdev->dev, ml);
return ret;
}
static int mrvl_loki_remove(struct platform_device *pdev)
{
struct mrvl_loki *ml = platform_get_drvdata(pdev);
free_irq(ml->intr_num, pdev);
devm_kfree(&pdev->dev, ml);
return 0;
}
static const struct of_device_id mrvl_loki_of_match[] = {
{ .compatible = "marvell,loki", },
{},
};
MODULE_DEVICE_TABLE(of, mrvl_loki_of_match);
static struct platform_driver mrvl_loki_driver = {
.probe = mrvl_loki_probe,
.remove = mrvl_loki_remove,
.driver = {
.name = "mrvl-loki",
.of_match_table = of_match_ptr(mrvl_loki_of_match),
},
};
module_platform_driver(mrvl_loki_driver);
MODULE_DESCRIPTION("Marvell Loki Driver");
MODULE_AUTHOR("Radha Mohan Chintakuntla");
MODULE_LICENSE("GPL v2");
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