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Brooklyn/drivers/ptp/ptp_ocp.c
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2022-03-15 21:13:23 +05:00

1597 lines
34 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2020 Facebook */
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/serial_8250.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/platform_device.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/spi/spi.h>
#include <linux/spi/xilinx_spi.h>
#include <net/devlink.h>
#include <linux/i2c.h>
#include <linux/mtd/mtd.h>
#ifndef PCI_VENDOR_ID_FACEBOOK
#define PCI_VENDOR_ID_FACEBOOK 0x1d9b
#endif
#ifndef PCI_DEVICE_ID_FACEBOOK_TIMECARD
#define PCI_DEVICE_ID_FACEBOOK_TIMECARD 0x0400
#endif
static struct class timecard_class = {
.owner = THIS_MODULE,
.name = "timecard",
};
struct ocp_reg {
u32 ctrl;
u32 status;
u32 select;
u32 version;
u32 time_ns;
u32 time_sec;
u32 __pad0[2];
u32 adjust_ns;
u32 adjust_sec;
u32 __pad1[2];
u32 offset_ns;
u32 offset_window_ns;
u32 __pad2[2];
u32 drift_ns;
u32 drift_window_ns;
u32 __pad3[6];
u32 servo_offset_p;
u32 servo_offset_i;
u32 servo_drift_p;
u32 servo_drift_i;
};
#define OCP_CTRL_ENABLE BIT(0)
#define OCP_CTRL_ADJUST_TIME BIT(1)
#define OCP_CTRL_ADJUST_OFFSET BIT(2)
#define OCP_CTRL_ADJUST_DRIFT BIT(3)
#define OCP_CTRL_ADJUST_SERVO BIT(8)
#define OCP_CTRL_READ_TIME_REQ BIT(30)
#define OCP_CTRL_READ_TIME_DONE BIT(31)
#define OCP_STATUS_IN_SYNC BIT(0)
#define OCP_STATUS_IN_HOLDOVER BIT(1)
#define OCP_SELECT_CLK_NONE 0
#define OCP_SELECT_CLK_REG 0xfe
struct tod_reg {
u32 ctrl;
u32 status;
u32 uart_polarity;
u32 version;
u32 correction_sec;
u32 __pad0[3];
u32 uart_baud;
u32 __pad1[3];
u32 utc_status;
u32 leap;
};
#define TOD_CTRL_PROTOCOL BIT(28)
#define TOD_CTRL_DISABLE_FMT_A BIT(17)
#define TOD_CTRL_DISABLE_FMT_B BIT(16)
#define TOD_CTRL_ENABLE BIT(0)
#define TOD_CTRL_GNSS_MASK ((1U << 4) - 1)
#define TOD_CTRL_GNSS_SHIFT 24
#define TOD_STATUS_UTC_MASK 0xff
#define TOD_STATUS_UTC_VALID BIT(8)
#define TOD_STATUS_LEAP_VALID BIT(16)
struct ts_reg {
u32 enable;
u32 error;
u32 polarity;
u32 version;
u32 __pad0[4];
u32 cable_delay;
u32 __pad1[3];
u32 intr;
u32 intr_mask;
u32 event_count;
u32 __pad2[1];
u32 ts_count;
u32 time_ns;
u32 time_sec;
u32 data_width;
u32 data;
};
struct pps_reg {
u32 ctrl;
u32 status;
u32 __pad0[6];
u32 cable_delay;
};
#define PPS_STATUS_FILTER_ERR BIT(0)
#define PPS_STATUS_SUPERV_ERR BIT(1)
struct img_reg {
u32 version;
};
struct ptp_ocp_flash_info {
const char *name;
int pci_offset;
int data_size;
void *data;
};
struct ptp_ocp_ext_info {
const char *name;
int index;
irqreturn_t (*irq_fcn)(int irq, void *priv);
int (*enable)(void *priv, bool enable);
};
struct ptp_ocp_ext_src {
void __iomem *mem;
struct ptp_ocp *bp;
struct ptp_ocp_ext_info *info;
int irq_vec;
};
struct ptp_ocp {
struct pci_dev *pdev;
struct device dev;
spinlock_t lock;
struct ocp_reg __iomem *reg;
struct tod_reg __iomem *tod;
struct pps_reg __iomem *pps_to_ext;
struct pps_reg __iomem *pps_to_clk;
struct ptp_ocp_ext_src *pps;
struct ptp_ocp_ext_src *ts0;
struct ptp_ocp_ext_src *ts1;
struct img_reg __iomem *image;
struct ptp_clock *ptp;
struct ptp_clock_info ptp_info;
struct platform_device *i2c_ctrl;
struct platform_device *spi_flash;
struct clk_hw *i2c_clk;
struct timer_list watchdog;
time64_t gnss_lost;
int id;
int n_irqs;
int gnss_port;
int mac_port; /* miniature atomic clock */
u8 serial[6];
int flash_start;
bool has_serial;
};
struct ocp_resource {
unsigned long offset;
int size;
int irq_vec;
int (*setup)(struct ptp_ocp *bp, struct ocp_resource *r);
void *extra;
unsigned long bp_offset;
};
static int ptp_ocp_register_mem(struct ptp_ocp *bp, struct ocp_resource *r);
static int ptp_ocp_register_i2c(struct ptp_ocp *bp, struct ocp_resource *r);
static int ptp_ocp_register_spi(struct ptp_ocp *bp, struct ocp_resource *r);
static int ptp_ocp_register_serial(struct ptp_ocp *bp, struct ocp_resource *r);
static int ptp_ocp_register_ext(struct ptp_ocp *bp, struct ocp_resource *r);
static int ptp_ocp_fb_board_init(struct ptp_ocp *bp, struct ocp_resource *r);
static irqreturn_t ptp_ocp_ts_irq(int irq, void *priv);
static int ptp_ocp_ts_enable(void *priv, bool enable);
#define bp_assign_entry(bp, res, val) ({ \
uintptr_t addr = (uintptr_t)(bp) + (res)->bp_offset; \
*(typeof(val) *)addr = val; \
})
#define OCP_RES_LOCATION(member) \
.bp_offset = offsetof(struct ptp_ocp, member)
#define OCP_MEM_RESOURCE(member) \
OCP_RES_LOCATION(member), .setup = ptp_ocp_register_mem
#define OCP_SERIAL_RESOURCE(member) \
OCP_RES_LOCATION(member), .setup = ptp_ocp_register_serial
#define OCP_I2C_RESOURCE(member) \
OCP_RES_LOCATION(member), .setup = ptp_ocp_register_i2c
#define OCP_SPI_RESOURCE(member) \
OCP_RES_LOCATION(member), .setup = ptp_ocp_register_spi
#define OCP_EXT_RESOURCE(member) \
OCP_RES_LOCATION(member), .setup = ptp_ocp_register_ext
/* This is the MSI vector mapping used.
* 0: N/C
* 1: TS0
* 2: TS1
* 3: GPS
* 4: GPS2 (n/c)
* 5: MAC
* 6: SPI IMU (inertial measurement unit)
* 7: I2C oscillator
* 8: HWICAP
* 9: SPI Flash
*/
static struct ocp_resource ocp_fb_resource[] = {
{
OCP_MEM_RESOURCE(reg),
.offset = 0x01000000, .size = 0x10000,
},
{
OCP_EXT_RESOURCE(ts0),
.offset = 0x01010000, .size = 0x10000, .irq_vec = 1,
.extra = &(struct ptp_ocp_ext_info) {
.name = "ts0", .index = 0,
.irq_fcn = ptp_ocp_ts_irq,
.enable = ptp_ocp_ts_enable,
},
},
{
OCP_EXT_RESOURCE(ts1),
.offset = 0x01020000, .size = 0x10000, .irq_vec = 2,
.extra = &(struct ptp_ocp_ext_info) {
.name = "ts1", .index = 1,
.irq_fcn = ptp_ocp_ts_irq,
.enable = ptp_ocp_ts_enable,
},
},
{
OCP_MEM_RESOURCE(pps_to_ext),
.offset = 0x01030000, .size = 0x10000,
},
{
OCP_MEM_RESOURCE(pps_to_clk),
.offset = 0x01040000, .size = 0x10000,
},
{
OCP_MEM_RESOURCE(tod),
.offset = 0x01050000, .size = 0x10000,
},
{
OCP_MEM_RESOURCE(image),
.offset = 0x00020000, .size = 0x1000,
},
{
OCP_I2C_RESOURCE(i2c_ctrl),
.offset = 0x00150000, .size = 0x10000, .irq_vec = 7,
},
{
OCP_SERIAL_RESOURCE(gnss_port),
.offset = 0x00160000 + 0x1000, .irq_vec = 3,
},
{
OCP_SERIAL_RESOURCE(mac_port),
.offset = 0x00180000 + 0x1000, .irq_vec = 5,
},
{
OCP_SPI_RESOURCE(spi_flash),
.offset = 0x00310000, .size = 0x10000, .irq_vec = 9,
.extra = &(struct ptp_ocp_flash_info) {
.name = "xilinx_spi", .pci_offset = 0,
.data_size = sizeof(struct xspi_platform_data),
.data = &(struct xspi_platform_data) {
.num_chipselect = 1,
.bits_per_word = 8,
.num_devices = 1,
.devices = &(struct spi_board_info) {
.modalias = "spi-nor",
},
},
},
},
{
.setup = ptp_ocp_fb_board_init,
},
{ }
};
static const struct pci_device_id ptp_ocp_pcidev_id[] = {
{ PCI_DEVICE_DATA(FACEBOOK, TIMECARD, &ocp_fb_resource) },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, ptp_ocp_pcidev_id);
static DEFINE_MUTEX(ptp_ocp_lock);
static DEFINE_IDR(ptp_ocp_idr);
static struct {
const char *name;
int value;
} ptp_ocp_clock[] = {
{ .name = "NONE", .value = 0 },
{ .name = "TOD", .value = 1 },
{ .name = "IRIG", .value = 2 },
{ .name = "PPS", .value = 3 },
{ .name = "PTP", .value = 4 },
{ .name = "RTC", .value = 5 },
{ .name = "DCF", .value = 6 },
{ .name = "REGS", .value = 0xfe },
{ .name = "EXT", .value = 0xff },
};
static const char *
ptp_ocp_clock_name_from_val(int val)
{
int i;
for (i = 0; i < ARRAY_SIZE(ptp_ocp_clock); i++)
if (ptp_ocp_clock[i].value == val)
return ptp_ocp_clock[i].name;
return NULL;
}
static int
ptp_ocp_clock_val_from_name(const char *name)
{
const char *clk;
int i;
for (i = 0; i < ARRAY_SIZE(ptp_ocp_clock); i++) {
clk = ptp_ocp_clock[i].name;
if (!strncasecmp(name, clk, strlen(clk)))
return ptp_ocp_clock[i].value;
}
return -EINVAL;
}
static int
__ptp_ocp_gettime_locked(struct ptp_ocp *bp, struct timespec64 *ts,
struct ptp_system_timestamp *sts)
{
u32 ctrl, time_sec, time_ns;
int i;
ctrl = ioread32(&bp->reg->ctrl);
ctrl |= OCP_CTRL_READ_TIME_REQ;
ptp_read_system_prets(sts);
iowrite32(ctrl, &bp->reg->ctrl);
for (i = 0; i < 100; i++) {
ctrl = ioread32(&bp->reg->ctrl);
if (ctrl & OCP_CTRL_READ_TIME_DONE)
break;
}
ptp_read_system_postts(sts);
time_ns = ioread32(&bp->reg->time_ns);
time_sec = ioread32(&bp->reg->time_sec);
ts->tv_sec = time_sec;
ts->tv_nsec = time_ns;
return ctrl & OCP_CTRL_READ_TIME_DONE ? 0 : -ETIMEDOUT;
}
static int
ptp_ocp_gettimex(struct ptp_clock_info *ptp_info, struct timespec64 *ts,
struct ptp_system_timestamp *sts)
{
struct ptp_ocp *bp = container_of(ptp_info, struct ptp_ocp, ptp_info);
unsigned long flags;
int err;
spin_lock_irqsave(&bp->lock, flags);
err = __ptp_ocp_gettime_locked(bp, ts, sts);
spin_unlock_irqrestore(&bp->lock, flags);
return err;
}
static void
__ptp_ocp_settime_locked(struct ptp_ocp *bp, const struct timespec64 *ts)
{
u32 ctrl, time_sec, time_ns;
u32 select;
time_ns = ts->tv_nsec;
time_sec = ts->tv_sec;
select = ioread32(&bp->reg->select);
iowrite32(OCP_SELECT_CLK_REG, &bp->reg->select);
iowrite32(time_ns, &bp->reg->adjust_ns);
iowrite32(time_sec, &bp->reg->adjust_sec);
ctrl = ioread32(&bp->reg->ctrl);
ctrl |= OCP_CTRL_ADJUST_TIME;
iowrite32(ctrl, &bp->reg->ctrl);
/* restore clock selection */
iowrite32(select >> 16, &bp->reg->select);
}
static int
ptp_ocp_settime(struct ptp_clock_info *ptp_info, const struct timespec64 *ts)
{
struct ptp_ocp *bp = container_of(ptp_info, struct ptp_ocp, ptp_info);
unsigned long flags;
if (ioread32(&bp->reg->status) & OCP_STATUS_IN_SYNC)
return 0;
spin_lock_irqsave(&bp->lock, flags);
__ptp_ocp_settime_locked(bp, ts);
spin_unlock_irqrestore(&bp->lock, flags);
return 0;
}
static int
ptp_ocp_adjtime(struct ptp_clock_info *ptp_info, s64 delta_ns)
{
struct ptp_ocp *bp = container_of(ptp_info, struct ptp_ocp, ptp_info);
struct timespec64 ts;
unsigned long flags;
int err;
if (ioread32(&bp->reg->status) & OCP_STATUS_IN_SYNC)
return 0;
spin_lock_irqsave(&bp->lock, flags);
err = __ptp_ocp_gettime_locked(bp, &ts, NULL);
if (likely(!err)) {
timespec64_add_ns(&ts, delta_ns);
__ptp_ocp_settime_locked(bp, &ts);
}
spin_unlock_irqrestore(&bp->lock, flags);
return err;
}
static int
ptp_ocp_null_adjfine(struct ptp_clock_info *ptp_info, long scaled_ppm)
{
if (scaled_ppm == 0)
return 0;
return -EOPNOTSUPP;
}
static int
ptp_ocp_adjphase(struct ptp_clock_info *ptp_info, s32 phase_ns)
{
return -EOPNOTSUPP;
}
static int
ptp_ocp_enable(struct ptp_clock_info *ptp_info, struct ptp_clock_request *rq,
int on)
{
struct ptp_ocp *bp = container_of(ptp_info, struct ptp_ocp, ptp_info);
struct ptp_ocp_ext_src *ext = NULL;
int err;
switch (rq->type) {
case PTP_CLK_REQ_EXTTS:
switch (rq->extts.index) {
case 0:
ext = bp->ts0;
break;
case 1:
ext = bp->ts1;
break;
}
break;
case PTP_CLK_REQ_PPS:
ext = bp->pps;
break;
default:
return -EOPNOTSUPP;
}
err = -ENXIO;
if (ext)
err = ext->info->enable(ext, on);
return err;
}
static const struct ptp_clock_info ptp_ocp_clock_info = {
.owner = THIS_MODULE,
.name = KBUILD_MODNAME,
.max_adj = 100000000,
.gettimex64 = ptp_ocp_gettimex,
.settime64 = ptp_ocp_settime,
.adjtime = ptp_ocp_adjtime,
.adjfine = ptp_ocp_null_adjfine,
.adjphase = ptp_ocp_adjphase,
.enable = ptp_ocp_enable,
.pps = true,
.n_ext_ts = 2,
};
static void
__ptp_ocp_clear_drift_locked(struct ptp_ocp *bp)
{
u32 ctrl, select;
select = ioread32(&bp->reg->select);
iowrite32(OCP_SELECT_CLK_REG, &bp->reg->select);
iowrite32(0, &bp->reg->drift_ns);
ctrl = ioread32(&bp->reg->ctrl);
ctrl |= OCP_CTRL_ADJUST_DRIFT;
iowrite32(ctrl, &bp->reg->ctrl);
/* restore clock selection */
iowrite32(select >> 16, &bp->reg->select);
}
static void
ptp_ocp_watchdog(struct timer_list *t)
{
struct ptp_ocp *bp = from_timer(bp, t, watchdog);
unsigned long flags;
u32 status;
status = ioread32(&bp->pps_to_clk->status);
if (status & PPS_STATUS_SUPERV_ERR) {
iowrite32(status, &bp->pps_to_clk->status);
if (!bp->gnss_lost) {
spin_lock_irqsave(&bp->lock, flags);
__ptp_ocp_clear_drift_locked(bp);
spin_unlock_irqrestore(&bp->lock, flags);
bp->gnss_lost = ktime_get_real_seconds();
}
} else if (bp->gnss_lost) {
bp->gnss_lost = 0;
}
mod_timer(&bp->watchdog, jiffies + HZ);
}
static int
ptp_ocp_init_clock(struct ptp_ocp *bp)
{
struct timespec64 ts;
bool sync;
u32 ctrl;
/* make sure clock is enabled */
ctrl = ioread32(&bp->reg->ctrl);
ctrl |= OCP_CTRL_ENABLE;
iowrite32(ctrl, &bp->reg->ctrl);
/* NO DRIFT Correction */
/* offset_p:i 1/8, offset_i: 1/16, drift_p: 0, drift_i: 0 */
iowrite32(0x2000, &bp->reg->servo_offset_p);
iowrite32(0x1000, &bp->reg->servo_offset_i);
iowrite32(0, &bp->reg->servo_drift_p);
iowrite32(0, &bp->reg->servo_drift_i);
/* latch servo values */
ctrl |= OCP_CTRL_ADJUST_SERVO;
iowrite32(ctrl, &bp->reg->ctrl);
if ((ioread32(&bp->reg->ctrl) & OCP_CTRL_ENABLE) == 0) {
dev_err(&bp->pdev->dev, "clock not enabled\n");
return -ENODEV;
}
sync = ioread32(&bp->reg->status) & OCP_STATUS_IN_SYNC;
if (!sync) {
ktime_get_real_ts64(&ts);
ptp_ocp_settime(&bp->ptp_info, &ts);
}
if (!ptp_ocp_gettimex(&bp->ptp_info, &ts, NULL))
dev_info(&bp->pdev->dev, "Time: %lld.%ld, %s\n",
ts.tv_sec, ts.tv_nsec,
sync ? "in-sync" : "UNSYNCED");
timer_setup(&bp->watchdog, ptp_ocp_watchdog, 0);
mod_timer(&bp->watchdog, jiffies + HZ);
return 0;
}
static void
ptp_ocp_tod_info(struct ptp_ocp *bp)
{
static const char * const proto_name[] = {
"NMEA", "NMEA_ZDA", "NMEA_RMC", "NMEA_none",
"UBX", "UBX_UTC", "UBX_LS", "UBX_none"
};
static const char * const gnss_name[] = {
"ALL", "COMBINED", "GPS", "GLONASS", "GALILEO", "BEIDOU",
};
u32 version, ctrl, reg;
int idx;
version = ioread32(&bp->tod->version);
dev_info(&bp->pdev->dev, "TOD Version %d.%d.%d\n",
version >> 24, (version >> 16) & 0xff, version & 0xffff);
ctrl = ioread32(&bp->tod->ctrl);
ctrl |= TOD_CTRL_PROTOCOL | TOD_CTRL_ENABLE;
ctrl &= ~(TOD_CTRL_DISABLE_FMT_A | TOD_CTRL_DISABLE_FMT_B);
iowrite32(ctrl, &bp->tod->ctrl);
ctrl = ioread32(&bp->tod->ctrl);
idx = ctrl & TOD_CTRL_PROTOCOL ? 4 : 0;
idx += (ctrl >> 16) & 3;
dev_info(&bp->pdev->dev, "control: %x\n", ctrl);
dev_info(&bp->pdev->dev, "TOD Protocol %s %s\n", proto_name[idx],
ctrl & TOD_CTRL_ENABLE ? "enabled" : "");
idx = (ctrl >> TOD_CTRL_GNSS_SHIFT) & TOD_CTRL_GNSS_MASK;
if (idx < ARRAY_SIZE(gnss_name))
dev_info(&bp->pdev->dev, "GNSS %s\n", gnss_name[idx]);
reg = ioread32(&bp->tod->status);
dev_info(&bp->pdev->dev, "status: %x\n", reg);
reg = ioread32(&bp->tod->correction_sec);
dev_info(&bp->pdev->dev, "correction: %d\n", reg);
reg = ioread32(&bp->tod->utc_status);
dev_info(&bp->pdev->dev, "utc_status: %x\n", reg);
dev_info(&bp->pdev->dev, "utc_offset: %d valid:%d leap_valid:%d\n",
reg & TOD_STATUS_UTC_MASK, reg & TOD_STATUS_UTC_VALID ? 1 : 0,
reg & TOD_STATUS_LEAP_VALID ? 1 : 0);
}
static int
ptp_ocp_firstchild(struct device *dev, void *data)
{
return 1;
}
static int
ptp_ocp_read_i2c(struct i2c_adapter *adap, u8 addr, u8 reg, u8 sz, u8 *data)
{
struct i2c_msg msgs[2] = {
{
.addr = addr,
.len = 1,
.buf = &reg,
},
{
.addr = addr,
.flags = I2C_M_RD,
.len = 2,
.buf = data,
},
};
int err;
u8 len;
/* xiic-i2c for some stupid reason only does 2 byte reads. */
while (sz) {
len = min_t(u8, sz, 2);
msgs[1].len = len;
err = i2c_transfer(adap, msgs, 2);
if (err != msgs[1].len)
return err;
msgs[1].buf += len;
reg += len;
sz -= len;
}
return 0;
}
static void
ptp_ocp_get_serial_number(struct ptp_ocp *bp)
{
struct i2c_adapter *adap;
struct device *dev;
int err;
dev = device_find_child(&bp->i2c_ctrl->dev, NULL, ptp_ocp_firstchild);
if (!dev) {
dev_err(&bp->pdev->dev, "Can't find I2C adapter\n");
return;
}
adap = i2c_verify_adapter(dev);
if (!adap) {
dev_err(&bp->pdev->dev, "device '%s' isn't an I2C adapter\n",
dev_name(dev));
goto out;
}
err = ptp_ocp_read_i2c(adap, 0x58, 0x9A, 6, bp->serial);
if (err) {
dev_err(&bp->pdev->dev, "could not read eeprom: %d\n", err);
goto out;
}
bp->has_serial = true;
out:
put_device(dev);
}
static void
ptp_ocp_info(struct ptp_ocp *bp)
{
u32 version, select;
version = ioread32(&bp->reg->version);
select = ioread32(&bp->reg->select);
dev_info(&bp->pdev->dev, "Version %d.%d.%d, clock %s, device ptp%d\n",
version >> 24, (version >> 16) & 0xff, version & 0xffff,
ptp_ocp_clock_name_from_val(select >> 16),
ptp_clock_index(bp->ptp));
ptp_ocp_tod_info(bp);
}
static struct device *
ptp_ocp_find_flash(struct ptp_ocp *bp)
{
struct device *dev, *last;
last = NULL;
dev = &bp->spi_flash->dev;
while ((dev = device_find_child(dev, NULL, ptp_ocp_firstchild))) {
if (!strcmp("mtd", dev_bus_name(dev)))
break;
put_device(last);
last = dev;
}
put_device(last);
return dev;
}
static int
ptp_ocp_devlink_flash(struct devlink *devlink, struct device *dev,
const struct firmware *fw)
{
struct mtd_info *mtd = dev_get_drvdata(dev);
struct ptp_ocp *bp = devlink_priv(devlink);
size_t off, len, resid, wrote;
struct erase_info erase;
size_t base, blksz;
int err = 0;
off = 0;
base = bp->flash_start;
blksz = 4096;
resid = fw->size;
while (resid) {
devlink_flash_update_status_notify(devlink, "Flashing",
NULL, off, fw->size);
len = min_t(size_t, resid, blksz);
erase.addr = base + off;
erase.len = blksz;
err = mtd_erase(mtd, &erase);
if (err)
goto out;
err = mtd_write(mtd, base + off, len, &wrote, &fw->data[off]);
if (err)
goto out;
off += blksz;
resid -= len;
}
out:
return err;
}
static int
ptp_ocp_devlink_flash_update(struct devlink *devlink,
struct devlink_flash_update_params *params,
struct netlink_ext_ack *extack)
{
struct ptp_ocp *bp = devlink_priv(devlink);
struct device *dev;
const char *msg;
int err;
dev = ptp_ocp_find_flash(bp);
if (!dev) {
dev_err(&bp->pdev->dev, "Can't find Flash SPI adapter\n");
return -ENODEV;
}
devlink_flash_update_status_notify(devlink, "Preparing to flash",
NULL, 0, 0);
err = ptp_ocp_devlink_flash(devlink, dev, params->fw);
msg = err ? "Flash error" : "Flash complete";
devlink_flash_update_status_notify(devlink, msg, NULL, 0, 0);
put_device(dev);
return err;
}
static int
ptp_ocp_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
struct netlink_ext_ack *extack)
{
struct ptp_ocp *bp = devlink_priv(devlink);
char buf[32];
int err;
err = devlink_info_driver_name_put(req, KBUILD_MODNAME);
if (err)
return err;
if (bp->image) {
u32 ver = ioread32(&bp->image->version);
if (ver & 0xffff) {
sprintf(buf, "%d", ver);
err = devlink_info_version_running_put(req,
"fw",
buf);
} else {
sprintf(buf, "%d", ver >> 16);
err = devlink_info_version_running_put(req,
"loader",
buf);
}
if (err)
return err;
}
if (!bp->has_serial)
ptp_ocp_get_serial_number(bp);
if (bp->has_serial) {
sprintf(buf, "%pM", bp->serial);
err = devlink_info_serial_number_put(req, buf);
if (err)
return err;
}
return 0;
}
static const struct devlink_ops ptp_ocp_devlink_ops = {
.flash_update = ptp_ocp_devlink_flash_update,
.info_get = ptp_ocp_devlink_info_get,
};
static void __iomem *
__ptp_ocp_get_mem(struct ptp_ocp *bp, unsigned long start, int size)
{
struct resource res = DEFINE_RES_MEM_NAMED(start, size, "ptp_ocp");
return devm_ioremap_resource(&bp->pdev->dev, &res);
}
static void __iomem *
ptp_ocp_get_mem(struct ptp_ocp *bp, struct ocp_resource *r)
{
unsigned long start;
start = pci_resource_start(bp->pdev, 0) + r->offset;
return __ptp_ocp_get_mem(bp, start, r->size);
}
static void
ptp_ocp_set_irq_resource(struct resource *res, int irq)
{
struct resource r = DEFINE_RES_IRQ(irq);
*res = r;
}
static void
ptp_ocp_set_mem_resource(struct resource *res, unsigned long start, int size)
{
struct resource r = DEFINE_RES_MEM(start, size);
*res = r;
}
static int
ptp_ocp_register_spi(struct ptp_ocp *bp, struct ocp_resource *r)
{
struct ptp_ocp_flash_info *info;
struct pci_dev *pdev = bp->pdev;
struct platform_device *p;
struct resource res[2];
unsigned long start;
int id;
/* XXX hack to work around old FPGA */
if (bp->n_irqs < 10) {
dev_err(&bp->pdev->dev, "FPGA does not have SPI devices\n");
return 0;
}
if (r->irq_vec > bp->n_irqs) {
dev_err(&bp->pdev->dev, "spi device irq %d out of range\n",
r->irq_vec);
return 0;
}
start = pci_resource_start(pdev, 0) + r->offset;
ptp_ocp_set_mem_resource(&res[0], start, r->size);
ptp_ocp_set_irq_resource(&res[1], pci_irq_vector(pdev, r->irq_vec));
info = r->extra;
id = pci_dev_id(pdev) << 1;
id += info->pci_offset;
p = platform_device_register_resndata(&pdev->dev, info->name, id,
res, 2, info->data,
info->data_size);
if (IS_ERR(p))
return PTR_ERR(p);
bp_assign_entry(bp, r, p);
return 0;
}
static struct platform_device *
ptp_ocp_i2c_bus(struct pci_dev *pdev, struct ocp_resource *r, int id)
{
struct resource res[2];
unsigned long start;
start = pci_resource_start(pdev, 0) + r->offset;
ptp_ocp_set_mem_resource(&res[0], start, r->size);
ptp_ocp_set_irq_resource(&res[1], pci_irq_vector(pdev, r->irq_vec));
return platform_device_register_resndata(&pdev->dev, "xiic-i2c",
id, res, 2, NULL, 0);
}
static int
ptp_ocp_register_i2c(struct ptp_ocp *bp, struct ocp_resource *r)
{
struct pci_dev *pdev = bp->pdev;
struct platform_device *p;
struct clk_hw *clk;
char buf[32];
int id;
if (r->irq_vec > bp->n_irqs) {
dev_err(&bp->pdev->dev, "i2c device irq %d out of range\n",
r->irq_vec);
return 0;
}
id = pci_dev_id(bp->pdev);
sprintf(buf, "AXI.%d", id);
clk = clk_hw_register_fixed_rate(&pdev->dev, buf, NULL, 0, 50000000);
if (IS_ERR(clk))
return PTR_ERR(clk);
bp->i2c_clk = clk;
sprintf(buf, "xiic-i2c.%d", id);
devm_clk_hw_register_clkdev(&pdev->dev, clk, NULL, buf);
p = ptp_ocp_i2c_bus(bp->pdev, r, id);
if (IS_ERR(p))
return PTR_ERR(p);
bp_assign_entry(bp, r, p);
return 0;
}
static irqreturn_t
ptp_ocp_ts_irq(int irq, void *priv)
{
struct ptp_ocp_ext_src *ext = priv;
struct ts_reg __iomem *reg = ext->mem;
struct ptp_clock_event ev;
u32 sec, nsec;
/* XXX should fix API - this converts s/ns -> ts -> s/ns */
sec = ioread32(&reg->time_sec);
nsec = ioread32(&reg->time_ns);
ev.type = PTP_CLOCK_EXTTS;
ev.index = ext->info->index;
ev.timestamp = sec * 1000000000ULL + nsec;
ptp_clock_event(ext->bp->ptp, &ev);
iowrite32(1, &reg->intr); /* write 1 to ack */
return IRQ_HANDLED;
}
static int
ptp_ocp_ts_enable(void *priv, bool enable)
{
struct ptp_ocp_ext_src *ext = priv;
struct ts_reg __iomem *reg = ext->mem;
if (enable) {
iowrite32(1, &reg->enable);
iowrite32(1, &reg->intr_mask);
iowrite32(1, &reg->intr);
} else {
iowrite32(0, &reg->intr_mask);
iowrite32(0, &reg->enable);
}
return 0;
}
static void
ptp_ocp_unregister_ext(struct ptp_ocp_ext_src *ext)
{
ext->info->enable(ext, false);
pci_free_irq(ext->bp->pdev, ext->irq_vec, ext);
kfree(ext);
}
static int
ptp_ocp_register_ext(struct ptp_ocp *bp, struct ocp_resource *r)
{
struct pci_dev *pdev = bp->pdev;
struct ptp_ocp_ext_src *ext;
int err;
ext = kzalloc(sizeof(*ext), GFP_KERNEL);
if (!ext)
return -ENOMEM;
ext->mem = ptp_ocp_get_mem(bp, r);
if (IS_ERR(ext->mem)) {
err = PTR_ERR(ext->mem);
goto out;
}
ext->bp = bp;
ext->info = r->extra;
ext->irq_vec = r->irq_vec;
err = pci_request_irq(pdev, r->irq_vec, ext->info->irq_fcn, NULL,
ext, "ocp%d.%s", bp->id, ext->info->name);
if (err) {
dev_err(&pdev->dev, "Could not get irq %d\n", r->irq_vec);
goto out;
}
bp_assign_entry(bp, r, ext);
return 0;
out:
kfree(ext);
return err;
}
static int
ptp_ocp_serial_line(struct ptp_ocp *bp, struct ocp_resource *r)
{
struct pci_dev *pdev = bp->pdev;
struct uart_8250_port uart;
/* Setting UPF_IOREMAP and leaving port.membase unspecified lets
* the serial port device claim and release the pci resource.
*/
memset(&uart, 0, sizeof(uart));
uart.port.dev = &pdev->dev;
uart.port.iotype = UPIO_MEM;
uart.port.regshift = 2;
uart.port.mapbase = pci_resource_start(pdev, 0) + r->offset;
uart.port.irq = pci_irq_vector(pdev, r->irq_vec);
uart.port.uartclk = 50000000;
uart.port.flags = UPF_FIXED_TYPE | UPF_IOREMAP;
uart.port.type = PORT_16550A;
return serial8250_register_8250_port(&uart);
}
static int
ptp_ocp_register_serial(struct ptp_ocp *bp, struct ocp_resource *r)
{
int port;
if (r->irq_vec > bp->n_irqs) {
dev_err(&bp->pdev->dev, "serial device irq %d out of range\n",
r->irq_vec);
return 0;
}
port = ptp_ocp_serial_line(bp, r);
if (port < 0)
return port;
bp_assign_entry(bp, r, port);
return 0;
}
static int
ptp_ocp_register_mem(struct ptp_ocp *bp, struct ocp_resource *r)
{
void __iomem *mem;
mem = ptp_ocp_get_mem(bp, r);
if (IS_ERR(mem))
return PTR_ERR(mem);
bp_assign_entry(bp, r, mem);
return 0;
}
/* FB specific board initializers; last "resource" registered. */
static int
ptp_ocp_fb_board_init(struct ptp_ocp *bp, struct ocp_resource *r)
{
bp->flash_start = 1024 * 4096;
return ptp_ocp_init_clock(bp);
}
static int
ptp_ocp_register_resources(struct ptp_ocp *bp, kernel_ulong_t driver_data)
{
struct ocp_resource *r, *table;
int err = 0;
table = (struct ocp_resource *)driver_data;
for (r = table; r->setup; r++) {
err = r->setup(bp, r);
if (err)
break;
}
return err;
}
static ssize_t
serialnum_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct ptp_ocp *bp = dev_get_drvdata(dev);
if (!bp->has_serial)
ptp_ocp_get_serial_number(bp);
return sysfs_emit(buf, "%pM\n", bp->serial);
}
static DEVICE_ATTR_RO(serialnum);
static ssize_t
gnss_sync_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct ptp_ocp *bp = dev_get_drvdata(dev);
ssize_t ret;
if (bp->gnss_lost)
ret = sysfs_emit(buf, "LOST @ %ptT\n", &bp->gnss_lost);
else
ret = sysfs_emit(buf, "SYNC\n");
return ret;
}
static DEVICE_ATTR_RO(gnss_sync);
static ssize_t
clock_source_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct ptp_ocp *bp = dev_get_drvdata(dev);
const char *p;
u32 select;
select = ioread32(&bp->reg->select);
p = ptp_ocp_clock_name_from_val(select >> 16);
return sysfs_emit(buf, "%s\n", p);
}
static ssize_t
clock_source_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ptp_ocp *bp = dev_get_drvdata(dev);
unsigned long flags;
int val;
val = ptp_ocp_clock_val_from_name(buf);
if (val < 0)
return val;
spin_lock_irqsave(&bp->lock, flags);
iowrite32(val, &bp->reg->select);
spin_unlock_irqrestore(&bp->lock, flags);
return count;
}
static DEVICE_ATTR_RW(clock_source);
static ssize_t
available_clock_sources_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
const char *clk;
ssize_t count;
int i;
count = 0;
for (i = 0; i < ARRAY_SIZE(ptp_ocp_clock); i++) {
clk = ptp_ocp_clock[i].name;
count += sysfs_emit_at(buf, count, "%s ", clk);
}
if (count)
count--;
count += sysfs_emit_at(buf, count, "\n");
return count;
}
static DEVICE_ATTR_RO(available_clock_sources);
static struct attribute *timecard_attrs[] = {
&dev_attr_serialnum.attr,
&dev_attr_gnss_sync.attr,
&dev_attr_clock_source.attr,
&dev_attr_available_clock_sources.attr,
NULL,
};
ATTRIBUTE_GROUPS(timecard);
static void
ptp_ocp_dev_release(struct device *dev)
{
struct ptp_ocp *bp = dev_get_drvdata(dev);
mutex_lock(&ptp_ocp_lock);
idr_remove(&ptp_ocp_idr, bp->id);
mutex_unlock(&ptp_ocp_lock);
}
static int
ptp_ocp_device_init(struct ptp_ocp *bp, struct pci_dev *pdev)
{
int err;
mutex_lock(&ptp_ocp_lock);
err = idr_alloc(&ptp_ocp_idr, bp, 0, 0, GFP_KERNEL);
mutex_unlock(&ptp_ocp_lock);
if (err < 0) {
dev_err(&pdev->dev, "idr_alloc failed: %d\n", err);
return err;
}
bp->id = err;
bp->ptp_info = ptp_ocp_clock_info;
spin_lock_init(&bp->lock);
bp->gnss_port = -1;
bp->mac_port = -1;
bp->pdev = pdev;
device_initialize(&bp->dev);
dev_set_name(&bp->dev, "ocp%d", bp->id);
bp->dev.class = &timecard_class;
bp->dev.parent = &pdev->dev;
bp->dev.release = ptp_ocp_dev_release;
dev_set_drvdata(&bp->dev, bp);
err = device_add(&bp->dev);
if (err) {
dev_err(&bp->dev, "device add failed: %d\n", err);
goto out;
}
pci_set_drvdata(pdev, bp);
return 0;
out:
ptp_ocp_dev_release(&bp->dev);
put_device(&bp->dev);
return err;
}
static void
ptp_ocp_symlink(struct ptp_ocp *bp, struct device *child, const char *link)
{
struct device *dev = &bp->dev;
if (sysfs_create_link(&dev->kobj, &child->kobj, link))
dev_err(dev, "%s symlink failed\n", link);
}
static void
ptp_ocp_link_child(struct ptp_ocp *bp, const char *name, const char *link)
{
struct device *dev, *child;
dev = &bp->pdev->dev;
child = device_find_child_by_name(dev, name);
if (!child) {
dev_err(dev, "Could not find device %s\n", name);
return;
}
ptp_ocp_symlink(bp, child, link);
put_device(child);
}
static int
ptp_ocp_complete(struct ptp_ocp *bp)
{
struct pps_device *pps;
char buf[32];
if (bp->gnss_port != -1) {
sprintf(buf, "ttyS%d", bp->gnss_port);
ptp_ocp_link_child(bp, buf, "ttyGNSS");
}
if (bp->mac_port != -1) {
sprintf(buf, "ttyS%d", bp->mac_port);
ptp_ocp_link_child(bp, buf, "ttyMAC");
}
sprintf(buf, "ptp%d", ptp_clock_index(bp->ptp));
ptp_ocp_link_child(bp, buf, "ptp");
pps = pps_lookup_dev(bp->ptp);
if (pps)
ptp_ocp_symlink(bp, pps->dev, "pps");
if (device_add_groups(&bp->dev, timecard_groups))
pr_err("device add groups failed\n");
return 0;
}
static void
ptp_ocp_resource_summary(struct ptp_ocp *bp)
{
struct device *dev = &bp->pdev->dev;
if (bp->image) {
u32 ver = ioread32(&bp->image->version);
dev_info(dev, "version %x\n", ver);
if (ver & 0xffff)
dev_info(dev, "regular image, version %d\n",
ver & 0xffff);
else
dev_info(dev, "golden image, version %d\n",
ver >> 16);
}
if (bp->gnss_port != -1)
dev_info(dev, "GNSS @ /dev/ttyS%d 115200\n", bp->gnss_port);
if (bp->mac_port != -1)
dev_info(dev, "MAC @ /dev/ttyS%d 57600\n", bp->mac_port);
}
static void
ptp_ocp_detach_sysfs(struct ptp_ocp *bp)
{
struct device *dev = &bp->dev;
sysfs_remove_link(&dev->kobj, "ttyGNSS");
sysfs_remove_link(&dev->kobj, "ttyMAC");
sysfs_remove_link(&dev->kobj, "ptp");
sysfs_remove_link(&dev->kobj, "pps");
device_remove_groups(dev, timecard_groups);
}
static void
ptp_ocp_detach(struct ptp_ocp *bp)
{
ptp_ocp_detach_sysfs(bp);
if (timer_pending(&bp->watchdog))
del_timer_sync(&bp->watchdog);
if (bp->ts0)
ptp_ocp_unregister_ext(bp->ts0);
if (bp->ts1)
ptp_ocp_unregister_ext(bp->ts1);
if (bp->pps)
ptp_ocp_unregister_ext(bp->pps);
if (bp->gnss_port != -1)
serial8250_unregister_port(bp->gnss_port);
if (bp->mac_port != -1)
serial8250_unregister_port(bp->mac_port);
if (bp->spi_flash)
platform_device_unregister(bp->spi_flash);
if (bp->i2c_ctrl)
platform_device_unregister(bp->i2c_ctrl);
if (bp->i2c_clk)
clk_hw_unregister_fixed_rate(bp->i2c_clk);
if (bp->n_irqs)
pci_free_irq_vectors(bp->pdev);
if (bp->ptp)
ptp_clock_unregister(bp->ptp);
device_unregister(&bp->dev);
}
static int
ptp_ocp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct devlink *devlink;
struct ptp_ocp *bp;
int err;
devlink = devlink_alloc(&ptp_ocp_devlink_ops, sizeof(*bp), &pdev->dev);
if (!devlink) {
dev_err(&pdev->dev, "devlink_alloc failed\n");
return -ENOMEM;
}
err = devlink_register(devlink);
if (err)
goto out_free;
err = pci_enable_device(pdev);
if (err) {
dev_err(&pdev->dev, "pci_enable_device\n");
goto out_unregister;
}
bp = devlink_priv(devlink);
err = ptp_ocp_device_init(bp, pdev);
if (err)
goto out_disable;
/* compat mode.
* Older FPGA firmware only returns 2 irq's.
* allow this - if not all of the IRQ's are returned, skip the
* extra devices and just register the clock.
*/
err = pci_alloc_irq_vectors(pdev, 1, 10, PCI_IRQ_MSI | PCI_IRQ_MSIX);
if (err < 0) {
dev_err(&pdev->dev, "alloc_irq_vectors err: %d\n", err);
goto out;
}
bp->n_irqs = err;
pci_set_master(pdev);
err = ptp_ocp_register_resources(bp, id->driver_data);
if (err)
goto out;
bp->ptp = ptp_clock_register(&bp->ptp_info, &pdev->dev);
if (IS_ERR(bp->ptp)) {
err = PTR_ERR(bp->ptp);
dev_err(&pdev->dev, "ptp_clock_register: %d\n", err);
bp->ptp = NULL;
goto out;
}
err = ptp_ocp_complete(bp);
if (err)
goto out;
ptp_ocp_info(bp);
ptp_ocp_resource_summary(bp);
return 0;
out:
ptp_ocp_detach(bp);
pci_set_drvdata(pdev, NULL);
out_disable:
pci_disable_device(pdev);
out_unregister:
devlink_unregister(devlink);
out_free:
devlink_free(devlink);
return err;
}
static void
ptp_ocp_remove(struct pci_dev *pdev)
{
struct ptp_ocp *bp = pci_get_drvdata(pdev);
struct devlink *devlink = priv_to_devlink(bp);
ptp_ocp_detach(bp);
pci_set_drvdata(pdev, NULL);
pci_disable_device(pdev);
devlink_unregister(devlink);
devlink_free(devlink);
}
static struct pci_driver ptp_ocp_driver = {
.name = KBUILD_MODNAME,
.id_table = ptp_ocp_pcidev_id,
.probe = ptp_ocp_probe,
.remove = ptp_ocp_remove,
};
static int
ptp_ocp_i2c_notifier_call(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev, *child = data;
struct ptp_ocp *bp;
bool add;
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
case BUS_NOTIFY_DEL_DEVICE:
add = action == BUS_NOTIFY_ADD_DEVICE;
break;
default:
return 0;
}
if (!i2c_verify_adapter(child))
return 0;
dev = child;
while ((dev = dev->parent))
if (dev->driver && !strcmp(dev->driver->name, KBUILD_MODNAME))
goto found;
return 0;
found:
bp = dev_get_drvdata(dev);
if (add)
ptp_ocp_symlink(bp, child, "i2c");
else
sysfs_remove_link(&bp->dev.kobj, "i2c");
return 0;
}
static struct notifier_block ptp_ocp_i2c_notifier = {
.notifier_call = ptp_ocp_i2c_notifier_call,
};
static int __init
ptp_ocp_init(void)
{
const char *what;
int err;
what = "timecard class";
err = class_register(&timecard_class);
if (err)
goto out;
what = "i2c notifier";
err = bus_register_notifier(&i2c_bus_type, &ptp_ocp_i2c_notifier);
if (err)
goto out_notifier;
what = "ptp_ocp driver";
err = pci_register_driver(&ptp_ocp_driver);
if (err)
goto out_register;
return 0;
out_register:
bus_unregister_notifier(&i2c_bus_type, &ptp_ocp_i2c_notifier);
out_notifier:
class_unregister(&timecard_class);
out:
pr_err(KBUILD_MODNAME ": failed to register %s: %d\n", what, err);
return err;
}
static void __exit
ptp_ocp_fini(void)
{
bus_unregister_notifier(&i2c_bus_type, &ptp_ocp_i2c_notifier);
pci_unregister_driver(&ptp_ocp_driver);
class_unregister(&timecard_class);
}
module_init(ptp_ocp_init);
module_exit(ptp_ocp_fini);
MODULE_DESCRIPTION("OpenCompute TimeCard driver");
MODULE_LICENSE("GPL v2");