linux-stable/drivers/ptp/ptp_pch.c
Vaibhav Gupta 4b88b9ce72 ptp_pch: use generic power management
With legacy PM, drivers themselves were responsible for managing the
device's power states and takes care of register states.

After upgrading to the generic structure, PCI core will take care of
required tasks and drivers should do only device-specific operations.

In the case of ptp_pch, after removing PCI helper functions, .suspend()
and .resume() became empty-body functions. Hence, define them NULL and
use dev_pm_ops.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-25 12:35:44 -07:00

690 lines
15 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* PTP 1588 clock using the EG20T PCH
*
* Copyright (C) 2010 OMICRON electronics GmbH
* Copyright (C) 2011-2012 LAPIS SEMICONDUCTOR Co., LTD.
*
* This code was derived from the IXP46X driver.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/slab.h>
#define STATION_ADDR_LEN 20
#define PCI_DEVICE_ID_PCH_1588 0x8819
#define IO_MEM_BAR 1
#define DEFAULT_ADDEND 0xA0000000
#define TICKS_NS_SHIFT 5
#define N_EXT_TS 2
enum pch_status {
PCH_SUCCESS,
PCH_INVALIDPARAM,
PCH_NOTIMESTAMP,
PCH_INTERRUPTMODEINUSE,
PCH_FAILED,
PCH_UNSUPPORTED,
};
/**
* struct pch_ts_regs - IEEE 1588 registers
*/
struct pch_ts_regs {
u32 control;
u32 event;
u32 addend;
u32 accum;
u32 test;
u32 ts_compare;
u32 rsystime_lo;
u32 rsystime_hi;
u32 systime_lo;
u32 systime_hi;
u32 trgt_lo;
u32 trgt_hi;
u32 asms_lo;
u32 asms_hi;
u32 amms_lo;
u32 amms_hi;
u32 ch_control;
u32 ch_event;
u32 tx_snap_lo;
u32 tx_snap_hi;
u32 rx_snap_lo;
u32 rx_snap_hi;
u32 src_uuid_lo;
u32 src_uuid_hi;
u32 can_status;
u32 can_snap_lo;
u32 can_snap_hi;
u32 ts_sel;
u32 ts_st[6];
u32 reserve1[14];
u32 stl_max_set_en;
u32 stl_max_set;
u32 reserve2[13];
u32 srst;
};
#define PCH_TSC_RESET (1 << 0)
#define PCH_TSC_TTM_MASK (1 << 1)
#define PCH_TSC_ASMS_MASK (1 << 2)
#define PCH_TSC_AMMS_MASK (1 << 3)
#define PCH_TSC_PPSM_MASK (1 << 4)
#define PCH_TSE_TTIPEND (1 << 1)
#define PCH_TSE_SNS (1 << 2)
#define PCH_TSE_SNM (1 << 3)
#define PCH_TSE_PPS (1 << 4)
#define PCH_CC_MM (1 << 0)
#define PCH_CC_TA (1 << 1)
#define PCH_CC_MODE_SHIFT 16
#define PCH_CC_MODE_MASK 0x001F0000
#define PCH_CC_VERSION (1 << 31)
#define PCH_CE_TXS (1 << 0)
#define PCH_CE_RXS (1 << 1)
#define PCH_CE_OVR (1 << 0)
#define PCH_CE_VAL (1 << 1)
#define PCH_ECS_ETH (1 << 0)
#define PCH_ECS_CAN (1 << 1)
#define PCH_STATION_BYTES 6
#define PCH_IEEE1588_ETH (1 << 0)
#define PCH_IEEE1588_CAN (1 << 1)
/**
* struct pch_dev - Driver private data
*/
struct pch_dev {
struct pch_ts_regs __iomem *regs;
struct ptp_clock *ptp_clock;
struct ptp_clock_info caps;
int exts0_enabled;
int exts1_enabled;
u32 mem_base;
u32 mem_size;
u32 irq;
struct pci_dev *pdev;
spinlock_t register_lock;
};
/**
* struct pch_params - 1588 module parameter
*/
struct pch_params {
u8 station[STATION_ADDR_LEN];
};
/* structure to hold the module parameters */
static struct pch_params pch_param = {
"00:00:00:00:00:00"
};
/*
* Register access functions
*/
static inline void pch_eth_enable_set(struct pch_dev *chip)
{
u32 val;
/* SET the eth_enable bit */
val = ioread32(&chip->regs->ts_sel) | (PCH_ECS_ETH);
iowrite32(val, (&chip->regs->ts_sel));
}
static u64 pch_systime_read(struct pch_ts_regs __iomem *regs)
{
u64 ns;
u32 lo, hi;
lo = ioread32(&regs->systime_lo);
hi = ioread32(&regs->systime_hi);
ns = ((u64) hi) << 32;
ns |= lo;
ns <<= TICKS_NS_SHIFT;
return ns;
}
static void pch_systime_write(struct pch_ts_regs __iomem *regs, u64 ns)
{
u32 hi, lo;
ns >>= TICKS_NS_SHIFT;
hi = ns >> 32;
lo = ns & 0xffffffff;
iowrite32(lo, &regs->systime_lo);
iowrite32(hi, &regs->systime_hi);
}
static inline void pch_block_reset(struct pch_dev *chip)
{
u32 val;
/* Reset Hardware Assist block */
val = ioread32(&chip->regs->control) | PCH_TSC_RESET;
iowrite32(val, (&chip->regs->control));
val = val & ~PCH_TSC_RESET;
iowrite32(val, (&chip->regs->control));
}
u32 pch_ch_control_read(struct pci_dev *pdev)
{
struct pch_dev *chip = pci_get_drvdata(pdev);
u32 val;
val = ioread32(&chip->regs->ch_control);
return val;
}
EXPORT_SYMBOL(pch_ch_control_read);
void pch_ch_control_write(struct pci_dev *pdev, u32 val)
{
struct pch_dev *chip = pci_get_drvdata(pdev);
iowrite32(val, (&chip->regs->ch_control));
}
EXPORT_SYMBOL(pch_ch_control_write);
u32 pch_ch_event_read(struct pci_dev *pdev)
{
struct pch_dev *chip = pci_get_drvdata(pdev);
u32 val;
val = ioread32(&chip->regs->ch_event);
return val;
}
EXPORT_SYMBOL(pch_ch_event_read);
void pch_ch_event_write(struct pci_dev *pdev, u32 val)
{
struct pch_dev *chip = pci_get_drvdata(pdev);
iowrite32(val, (&chip->regs->ch_event));
}
EXPORT_SYMBOL(pch_ch_event_write);
u32 pch_src_uuid_lo_read(struct pci_dev *pdev)
{
struct pch_dev *chip = pci_get_drvdata(pdev);
u32 val;
val = ioread32(&chip->regs->src_uuid_lo);
return val;
}
EXPORT_SYMBOL(pch_src_uuid_lo_read);
u32 pch_src_uuid_hi_read(struct pci_dev *pdev)
{
struct pch_dev *chip = pci_get_drvdata(pdev);
u32 val;
val = ioread32(&chip->regs->src_uuid_hi);
return val;
}
EXPORT_SYMBOL(pch_src_uuid_hi_read);
u64 pch_rx_snap_read(struct pci_dev *pdev)
{
struct pch_dev *chip = pci_get_drvdata(pdev);
u64 ns;
u32 lo, hi;
lo = ioread32(&chip->regs->rx_snap_lo);
hi = ioread32(&chip->regs->rx_snap_hi);
ns = ((u64) hi) << 32;
ns |= lo;
ns <<= TICKS_NS_SHIFT;
return ns;
}
EXPORT_SYMBOL(pch_rx_snap_read);
u64 pch_tx_snap_read(struct pci_dev *pdev)
{
struct pch_dev *chip = pci_get_drvdata(pdev);
u64 ns;
u32 lo, hi;
lo = ioread32(&chip->regs->tx_snap_lo);
hi = ioread32(&chip->regs->tx_snap_hi);
ns = ((u64) hi) << 32;
ns |= lo;
ns <<= TICKS_NS_SHIFT;
return ns;
}
EXPORT_SYMBOL(pch_tx_snap_read);
/* This function enables all 64 bits in system time registers [high & low].
This is a work-around for non continuous value in the SystemTime Register*/
static void pch_set_system_time_count(struct pch_dev *chip)
{
iowrite32(0x01, &chip->regs->stl_max_set_en);
iowrite32(0xFFFFFFFF, &chip->regs->stl_max_set);
iowrite32(0x00, &chip->regs->stl_max_set_en);
}
static void pch_reset(struct pch_dev *chip)
{
/* Reset Hardware Assist */
pch_block_reset(chip);
/* enable all 32 bits in system time registers */
pch_set_system_time_count(chip);
}
/**
* pch_set_station_address() - This API sets the station address used by
* IEEE 1588 hardware when looking at PTP
* traffic on the ethernet interface
* @addr: dress which contain the column separated address to be used.
*/
int pch_set_station_address(u8 *addr, struct pci_dev *pdev)
{
s32 i;
struct pch_dev *chip = pci_get_drvdata(pdev);
/* Verify the parameter */
if ((chip->regs == NULL) || addr == (u8 *)NULL) {
dev_err(&pdev->dev,
"invalid params returning PCH_INVALIDPARAM\n");
return PCH_INVALIDPARAM;
}
/* For all station address bytes */
for (i = 0; i < PCH_STATION_BYTES; i++) {
u32 val;
s32 tmp;
tmp = hex_to_bin(addr[i * 3]);
if (tmp < 0) {
dev_err(&pdev->dev,
"invalid params returning PCH_INVALIDPARAM\n");
return PCH_INVALIDPARAM;
}
val = tmp * 16;
tmp = hex_to_bin(addr[(i * 3) + 1]);
if (tmp < 0) {
dev_err(&pdev->dev,
"invalid params returning PCH_INVALIDPARAM\n");
return PCH_INVALIDPARAM;
}
val += tmp;
/* Expects ':' separated addresses */
if ((i < 5) && (addr[(i * 3) + 2] != ':')) {
dev_err(&pdev->dev,
"invalid params returning PCH_INVALIDPARAM\n");
return PCH_INVALIDPARAM;
}
/* Ideally we should set the address only after validating
entire string */
dev_dbg(&pdev->dev, "invoking pch_station_set\n");
iowrite32(val, &chip->regs->ts_st[i]);
}
return 0;
}
EXPORT_SYMBOL(pch_set_station_address);
/*
* Interrupt service routine
*/
static irqreturn_t isr(int irq, void *priv)
{
struct pch_dev *pch_dev = priv;
struct pch_ts_regs __iomem *regs = pch_dev->regs;
struct ptp_clock_event event;
u32 ack = 0, lo, hi, val;
val = ioread32(&regs->event);
if (val & PCH_TSE_SNS) {
ack |= PCH_TSE_SNS;
if (pch_dev->exts0_enabled) {
hi = ioread32(&regs->asms_hi);
lo = ioread32(&regs->asms_lo);
event.type = PTP_CLOCK_EXTTS;
event.index = 0;
event.timestamp = ((u64) hi) << 32;
event.timestamp |= lo;
event.timestamp <<= TICKS_NS_SHIFT;
ptp_clock_event(pch_dev->ptp_clock, &event);
}
}
if (val & PCH_TSE_SNM) {
ack |= PCH_TSE_SNM;
if (pch_dev->exts1_enabled) {
hi = ioread32(&regs->amms_hi);
lo = ioread32(&regs->amms_lo);
event.type = PTP_CLOCK_EXTTS;
event.index = 1;
event.timestamp = ((u64) hi) << 32;
event.timestamp |= lo;
event.timestamp <<= TICKS_NS_SHIFT;
ptp_clock_event(pch_dev->ptp_clock, &event);
}
}
if (val & PCH_TSE_TTIPEND)
ack |= PCH_TSE_TTIPEND; /* this bit seems to be always set */
if (ack) {
iowrite32(ack, &regs->event);
return IRQ_HANDLED;
} else
return IRQ_NONE;
}
/*
* PTP clock operations
*/
static int ptp_pch_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
{
u64 adj;
u32 diff, addend;
int neg_adj = 0;
struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
struct pch_ts_regs __iomem *regs = pch_dev->regs;
if (ppb < 0) {
neg_adj = 1;
ppb = -ppb;
}
addend = DEFAULT_ADDEND;
adj = addend;
adj *= ppb;
diff = div_u64(adj, 1000000000ULL);
addend = neg_adj ? addend - diff : addend + diff;
iowrite32(addend, &regs->addend);
return 0;
}
static int ptp_pch_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
s64 now;
unsigned long flags;
struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
struct pch_ts_regs __iomem *regs = pch_dev->regs;
spin_lock_irqsave(&pch_dev->register_lock, flags);
now = pch_systime_read(regs);
now += delta;
pch_systime_write(regs, now);
spin_unlock_irqrestore(&pch_dev->register_lock, flags);
return 0;
}
static int ptp_pch_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
{
u64 ns;
unsigned long flags;
struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
struct pch_ts_regs __iomem *regs = pch_dev->regs;
spin_lock_irqsave(&pch_dev->register_lock, flags);
ns = pch_systime_read(regs);
spin_unlock_irqrestore(&pch_dev->register_lock, flags);
*ts = ns_to_timespec64(ns);
return 0;
}
static int ptp_pch_settime(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
u64 ns;
unsigned long flags;
struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
struct pch_ts_regs __iomem *regs = pch_dev->regs;
ns = timespec64_to_ns(ts);
spin_lock_irqsave(&pch_dev->register_lock, flags);
pch_systime_write(regs, ns);
spin_unlock_irqrestore(&pch_dev->register_lock, flags);
return 0;
}
static int ptp_pch_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
struct pch_dev *pch_dev = container_of(ptp, struct pch_dev, caps);
switch (rq->type) {
case PTP_CLK_REQ_EXTTS:
switch (rq->extts.index) {
case 0:
pch_dev->exts0_enabled = on ? 1 : 0;
break;
case 1:
pch_dev->exts1_enabled = on ? 1 : 0;
break;
default:
return -EINVAL;
}
return 0;
default:
break;
}
return -EOPNOTSUPP;
}
static const struct ptp_clock_info ptp_pch_caps = {
.owner = THIS_MODULE,
.name = "PCH timer",
.max_adj = 50000000,
.n_ext_ts = N_EXT_TS,
.n_pins = 0,
.pps = 0,
.adjfreq = ptp_pch_adjfreq,
.adjtime = ptp_pch_adjtime,
.gettime64 = ptp_pch_gettime,
.settime64 = ptp_pch_settime,
.enable = ptp_pch_enable,
};
#define pch_suspend NULL
#define pch_resume NULL
static void pch_remove(struct pci_dev *pdev)
{
struct pch_dev *chip = pci_get_drvdata(pdev);
ptp_clock_unregister(chip->ptp_clock);
/* free the interrupt */
if (pdev->irq != 0)
free_irq(pdev->irq, chip);
/* unmap the virtual IO memory space */
if (chip->regs != NULL) {
iounmap(chip->regs);
chip->regs = NULL;
}
/* release the reserved IO memory space */
if (chip->mem_base != 0) {
release_mem_region(chip->mem_base, chip->mem_size);
chip->mem_base = 0;
}
pci_disable_device(pdev);
kfree(chip);
dev_info(&pdev->dev, "complete\n");
}
static s32
pch_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
s32 ret;
unsigned long flags;
struct pch_dev *chip;
chip = kzalloc(sizeof(struct pch_dev), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
/* enable the 1588 pci device */
ret = pci_enable_device(pdev);
if (ret != 0) {
dev_err(&pdev->dev, "could not enable the pci device\n");
goto err_pci_en;
}
chip->mem_base = pci_resource_start(pdev, IO_MEM_BAR);
if (!chip->mem_base) {
dev_err(&pdev->dev, "could not locate IO memory address\n");
ret = -ENODEV;
goto err_pci_start;
}
/* retrieve the available length of the IO memory space */
chip->mem_size = pci_resource_len(pdev, IO_MEM_BAR);
/* allocate the memory for the device registers */
if (!request_mem_region(chip->mem_base, chip->mem_size, "1588_regs")) {
dev_err(&pdev->dev,
"could not allocate register memory space\n");
ret = -EBUSY;
goto err_req_mem_region;
}
/* get the virtual address to the 1588 registers */
chip->regs = ioremap(chip->mem_base, chip->mem_size);
if (!chip->regs) {
dev_err(&pdev->dev, "Could not get virtual address\n");
ret = -ENOMEM;
goto err_ioremap;
}
chip->caps = ptp_pch_caps;
chip->ptp_clock = ptp_clock_register(&chip->caps, &pdev->dev);
if (IS_ERR(chip->ptp_clock)) {
ret = PTR_ERR(chip->ptp_clock);
goto err_ptp_clock_reg;
}
spin_lock_init(&chip->register_lock);
ret = request_irq(pdev->irq, &isr, IRQF_SHARED, KBUILD_MODNAME, chip);
if (ret != 0) {
dev_err(&pdev->dev, "failed to get irq %d\n", pdev->irq);
goto err_req_irq;
}
/* indicate success */
chip->irq = pdev->irq;
chip->pdev = pdev;
pci_set_drvdata(pdev, chip);
spin_lock_irqsave(&chip->register_lock, flags);
/* reset the ieee1588 h/w */
pch_reset(chip);
iowrite32(DEFAULT_ADDEND, &chip->regs->addend);
iowrite32(1, &chip->regs->trgt_lo);
iowrite32(0, &chip->regs->trgt_hi);
iowrite32(PCH_TSE_TTIPEND, &chip->regs->event);
pch_eth_enable_set(chip);
if (strcmp(pch_param.station, "00:00:00:00:00:00") != 0) {
if (pch_set_station_address(pch_param.station, pdev) != 0) {
dev_err(&pdev->dev,
"Invalid station address parameter\n"
"Module loaded but station address not set correctly\n"
);
}
}
spin_unlock_irqrestore(&chip->register_lock, flags);
return 0;
err_req_irq:
ptp_clock_unregister(chip->ptp_clock);
err_ptp_clock_reg:
iounmap(chip->regs);
chip->regs = NULL;
err_ioremap:
release_mem_region(chip->mem_base, chip->mem_size);
err_req_mem_region:
chip->mem_base = 0;
err_pci_start:
pci_disable_device(pdev);
err_pci_en:
kfree(chip);
dev_err(&pdev->dev, "probe failed(ret=0x%x)\n", ret);
return ret;
}
static const struct pci_device_id pch_ieee1588_pcidev_id[] = {
{
.vendor = PCI_VENDOR_ID_INTEL,
.device = PCI_DEVICE_ID_PCH_1588
},
{0}
};
static SIMPLE_DEV_PM_OPS(pch_pm_ops, pch_suspend, pch_resume);
static struct pci_driver pch_driver = {
.name = KBUILD_MODNAME,
.id_table = pch_ieee1588_pcidev_id,
.probe = pch_probe,
.remove = pch_remove,
.driver.pm = &pch_pm_ops,
};
static void __exit ptp_pch_exit(void)
{
pci_unregister_driver(&pch_driver);
}
static s32 __init ptp_pch_init(void)
{
s32 ret;
/* register the driver with the pci core */
ret = pci_register_driver(&pch_driver);
return ret;
}
module_init(ptp_pch_init);
module_exit(ptp_pch_exit);
module_param_string(station,
pch_param.station, sizeof(pch_param.station), 0444);
MODULE_PARM_DESC(station,
"IEEE 1588 station address to use - colon separated hex values");
MODULE_AUTHOR("LAPIS SEMICONDUCTOR, <tshimizu818@gmail.com>");
MODULE_DESCRIPTION("PTP clock using the EG20T timer");
MODULE_LICENSE("GPL");