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/*
* Copyright (C) 2016 Cavium, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*/
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/phy.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include "nic.h"
#include "thunder_bgx.h"
#define DRV_NAME "thunder-xcv"
#define DRV_VERSION "1.0"
/* Register offsets */
#define XCV_RESET 0x00
#define PORT_EN BIT_ULL(63)
#define CLK_RESET BIT_ULL(15)
#define DLL_RESET BIT_ULL(11)
#define COMP_EN BIT_ULL(7)
#define TX_PKT_RESET BIT_ULL(3)
#define TX_DATA_RESET BIT_ULL(2)
#define RX_PKT_RESET BIT_ULL(1)
#define RX_DATA_RESET BIT_ULL(0)
#define XCV_DLL_CTL 0x10
#define CLKRX_BYP BIT_ULL(23)
#define CLKTX_BYP BIT_ULL(15)
#define XCV_COMP_CTL 0x20
#define DRV_BYP BIT_ULL(63)
#define XCV_CTL 0x30
#define XCV_INT 0x40
#define XCV_INT_W1S 0x48
#define XCV_INT_ENA_W1C 0x50
#define XCV_INT_ENA_W1S 0x58
#define XCV_INBND_STATUS 0x80
#define XCV_BATCH_CRD_RET 0x100
struct xcv {
void __iomem *reg_base;
struct pci_dev *pdev;
};
static struct xcv *xcv;
/* Supported devices */
static const struct pci_device_id xcv_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xA056) },
{ 0, } /* end of table */
};
MODULE_AUTHOR("Cavium Inc");
MODULE_DESCRIPTION("Cavium Thunder RGX/XCV Driver");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRV_VERSION);
MODULE_DEVICE_TABLE(pci, xcv_id_table);
void xcv_init_hw(void)
{
u64 cfg;
/* Take DLL out of reset */
cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
cfg &= ~DLL_RESET;
writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
/* Take clock tree out of reset */
cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
cfg &= ~CLK_RESET;
writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
/* Wait for DLL to lock */
msleep(1);
/* Configure DLL - enable or bypass
* TX no bypass, RX bypass
*/
cfg = readq_relaxed(xcv->reg_base + XCV_DLL_CTL);
cfg &= ~0xFF03;
cfg |= CLKRX_BYP;
writeq_relaxed(cfg, xcv->reg_base + XCV_DLL_CTL);
/* Enable compensation controller and force the
* write to be visible to HW by readig back.
*/
cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
cfg |= COMP_EN;
writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
readq_relaxed(xcv->reg_base + XCV_RESET);
/* Wait for compensation state machine to lock */
msleep(10);
/* enable the XCV block */
cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
cfg |= PORT_EN;
writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
cfg |= CLK_RESET;
writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
}
EXPORT_SYMBOL(xcv_init_hw);
void xcv_setup_link(bool link_up, int link_speed)
{
u64 cfg;
int speed = 2;
if (!xcv) {
dev_err(&xcv->pdev->dev,
"XCV init not done, probe may have failed\n");
return;
}
if (link_speed == 100)
speed = 1;
else if (link_speed == 10)
speed = 0;
if (link_up) {
/* set operating speed */
cfg = readq_relaxed(xcv->reg_base + XCV_CTL);
cfg &= ~0x03;
cfg |= speed;
writeq_relaxed(cfg, xcv->reg_base + XCV_CTL);
/* Reset datapaths */
cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
cfg |= TX_DATA_RESET | RX_DATA_RESET;
writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
/* Enable the packet flow */
cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
cfg |= TX_PKT_RESET | RX_PKT_RESET;
writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
/* Return credits to RGX */
writeq_relaxed(0x01, xcv->reg_base + XCV_BATCH_CRD_RET);
} else {
/* Disable packet flow */
cfg = readq_relaxed(xcv->reg_base + XCV_RESET);
cfg &= ~(TX_PKT_RESET | RX_PKT_RESET);
writeq_relaxed(cfg, xcv->reg_base + XCV_RESET);
readq_relaxed(xcv->reg_base + XCV_RESET);
}
}
EXPORT_SYMBOL(xcv_setup_link);
static int xcv_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int err;
struct device *dev = &pdev->dev;
xcv = devm_kzalloc(dev, sizeof(struct xcv), GFP_KERNEL);
if (!xcv)
return -ENOMEM;
xcv->pdev = pdev;
pci_set_drvdata(pdev, xcv);
err = pci_enable_device(pdev);
if (err) {
dev_err(dev, "Failed to enable PCI device\n");
goto err_kfree;
}
err = pci_request_regions(pdev, DRV_NAME);
if (err) {
dev_err(dev, "PCI request regions failed 0x%x\n", err);
goto err_disable_device;
}
/* MAP configuration registers */
xcv->reg_base = pcim_iomap(pdev, PCI_CFG_REG_BAR_NUM, 0);
if (!xcv->reg_base) {
dev_err(dev, "XCV: Cannot map CSR memory space, aborting\n");
err = -ENOMEM;
goto err_release_regions;
}
return 0;
err_release_regions:
pci_release_regions(pdev);
err_disable_device:
pci_disable_device(pdev);
err_kfree:
devm_kfree(dev, xcv);
xcv = NULL;
return err;
}
static void xcv_remove(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;
if (xcv) {
devm_kfree(dev, xcv);
xcv = NULL;
}
pci_release_regions(pdev);
pci_disable_device(pdev);
}
static struct pci_driver xcv_driver = {
.name = DRV_NAME,
.id_table = xcv_id_table,
.probe = xcv_probe,
.remove = xcv_remove,
};
static int __init xcv_init_module(void)
{
pr_info("%s, ver %s\n", DRV_NAME, DRV_VERSION);
return pci_register_driver(&xcv_driver);
}
static void __exit xcv_cleanup_module(void)
{
pci_unregister_driver(&xcv_driver);
}
module_init(xcv_init_module);
module_exit(xcv_cleanup_module);
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