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IB/hfi1: Use built-in i2c bit-shift bus adapter 

Use built-in i2c bit-shift bus adapter to control the
i2c busses on the chip.

Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Easwar Hariharan <easwar.hariharan@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Dean Luick 2016-07-06 17:28:52 -04:00 committed by Doug Ledford
parent b094a36f90
commit dba715f0c8
6 changed files with 340 additions and 114 deletions
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3
drivers/infiniband/hw/hfi1/Kconfig
View File

@ -1,8 +1,9 @@
config INFINIBAND_HFI1
tristate "Intel OPA Gen1 support"
depends on X86_64 && INFINIBAND_RDMAVT
depends on X86_64 && INFINIBAND_RDMAVT && I2C
select MMU_NOTIFIER
select CRC32
select I2C_ALGOBIT
default m
---help---
This is a low-level driver for Intel OPA Gen1 adapter.

5
drivers/infiniband/hw/hfi1/chip.c
View File

@ -14165,6 +14165,11 @@ static int init_asic_data(struct hfi1_devdata *dd)
}
dd->asic_data->dds[dd->hfi1_id] = dd; /* self back-pointer */
spin_unlock_irqrestore(&hfi1_devs_lock, flags);
/* first one through - set up i2c devices */
if (!peer)
ret = set_up_i2c(dd, dd->asic_data);
return ret;
}

11
drivers/infiniband/hw/hfi1/hfi.h
View File

@ -62,6 +62,8 @@
#include <linux/cdev.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <rdma/rdma_vt.h>
#include "chip_registers.h"
@ -805,10 +807,19 @@ struct hfi1_temp {
u8 triggers; /* temperature triggers */
};
struct hfi1_i2c_bus {
struct hfi1_devdata *controlling_dd; /* current controlling device */
struct i2c_adapter adapter; /* bus details */
struct i2c_algo_bit_data algo; /* bus algorithm details */
int num; /* bus number, 0 or 1 */
};
/* common data between shared ASIC HFIs */
struct hfi1_asic_data {
struct hfi1_devdata *dds[2]; /* back pointers */
struct mutex asic_resource_mutex;
struct hfi1_i2c_bus *i2c_bus0;
struct hfi1_i2c_bus *i2c_bus1;
};
/* device data struct now contains only "general per-device" info.

27
drivers/infiniband/hw/hfi1/init.c
View File

@ -973,34 +973,45 @@ void hfi1_free_ctxtdata(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
/*
* Release our hold on the shared asic data. If we are the last one,
* free the structure. Must be holding hfi1_devs_lock.
* return the structure to be finalized outside the lock. Must be
* holding hfi1_devs_lock.
*/
static void release_asic_data(struct hfi1_devdata *dd)
static struct hfi1_asic_data *release_asic_data(struct hfi1_devdata *dd)
{
struct hfi1_asic_data *ad;
int other;
if (!dd->asic_data)
return;
return NULL;
dd->asic_data->dds[dd->hfi1_id] = NULL;
other = dd->hfi1_id ? 0 : 1;
if (!dd->asic_data->dds[other]) {
/* we are the last holder, free it */
kfree(dd->asic_data);
}
ad = dd->asic_data;
dd->asic_data = NULL;
/* return NULL if the other dd still has a link */
return ad->dds[other] ? NULL : ad;
}
static void finalize_asic_data(struct hfi1_devdata *dd,
struct hfi1_asic_data *ad)
{
clean_up_i2c(dd, ad);
kfree(ad);
}
static void __hfi1_free_devdata(struct kobject *kobj)
{
struct hfi1_devdata *dd =
container_of(kobj, struct hfi1_devdata, kobj);
struct hfi1_asic_data *ad;
unsigned long flags;
spin_lock_irqsave(&hfi1_devs_lock, flags);
idr_remove(&hfi1_unit_table, dd->unit);
list_del(&dd->list);
release_asic_data(dd);
ad = release_asic_data(dd);
spin_unlock_irqrestore(&hfi1_devs_lock, flags);
if (ad)
finalize_asic_data(dd, ad);
free_platform_config(dd);
rcu_barrier(); /* wait for rcu callbacks to complete */
free_percpu(dd->int_counter);

405
drivers/infiniband/hw/hfi1/qsfp.c
View File

@ -50,46 +50,285 @@
#include <linux/vmalloc.h>
#include "hfi.h"
#include "twsi.h"
/* for the given bus number, return the CSR for reading an i2c line */
static inline u32 i2c_in_csr(u32 bus_num)
{
return bus_num ? ASIC_QSFP2_IN : ASIC_QSFP1_IN;
}
/* for the given bus number, return the CSR for writing an i2c line */
static inline u32 i2c_oe_csr(u32 bus_num)
{
return bus_num ? ASIC_QSFP2_OE : ASIC_QSFP1_OE;
}
static void hfi1_setsda(void *data, int state)
{
struct hfi1_i2c_bus *bus = (struct hfi1_i2c_bus *)data;
struct hfi1_devdata *dd = bus->controlling_dd;
u64 reg;
u32 target_oe;
target_oe = i2c_oe_csr(bus->num);
reg = read_csr(dd, target_oe);
/*
* The OE bit value is inverted and connected to the pin. When
* OE is 0 the pin is left to be pulled up, when the OE is 1
* the pin is driven low. This matches the "open drain" or "open
* collector" convention.
*/
if (state)
reg &= ~QSFP_HFI0_I2CDAT;
else
reg |= QSFP_HFI0_I2CDAT;
write_csr(dd, target_oe, reg);
/* do a read to force the write into the chip */
(void)read_csr(dd, target_oe);
}
static void hfi1_setscl(void *data, int state)
{
struct hfi1_i2c_bus *bus = (struct hfi1_i2c_bus *)data;
struct hfi1_devdata *dd = bus->controlling_dd;
u64 reg;
u32 target_oe;
target_oe = i2c_oe_csr(bus->num);
reg = read_csr(dd, target_oe);
/*
* The OE bit value is inverted and connected to the pin. When
* OE is 0 the pin is left to be pulled up, when the OE is 1
* the pin is driven low. This matches the "open drain" or "open
* collector" convention.
*/
if (state)
reg &= ~QSFP_HFI0_I2CCLK;
else
reg |= QSFP_HFI0_I2CCLK;
write_csr(dd, target_oe, reg);
/* do a read to force the write into the chip */
(void)read_csr(dd, target_oe);
}
static int hfi1_getsda(void *data)
{
struct hfi1_i2c_bus *bus = (struct hfi1_i2c_bus *)data;
u64 reg;
u32 target_in;
hfi1_setsda(data, 1); /* clear OE so we do not pull line down */
udelay(2); /* 1us pull up + 250ns hold */
target_in = i2c_in_csr(bus->num);
reg = read_csr(bus->controlling_dd, target_in);
return !!(reg & QSFP_HFI0_I2CDAT);
}
static int hfi1_getscl(void *data)
{
struct hfi1_i2c_bus *bus = (struct hfi1_i2c_bus *)data;
u64 reg;
u32 target_in;
hfi1_setscl(data, 1); /* clear OE so we do not pull line down */
udelay(2); /* 1us pull up + 250ns hold */
target_in = i2c_in_csr(bus->num);
reg = read_csr(bus->controlling_dd, target_in);
return !!(reg & QSFP_HFI0_I2CCLK);
}
/*
* QSFP support for hfi driver, using "Two Wire Serial Interface" driver
* in twsi.c
* Allocate and initialize the given i2c bus number.
* Returns NULL on failure.
*/
#define I2C_MAX_RETRY 4
static struct hfi1_i2c_bus *init_i2c_bus(struct hfi1_devdata *dd,
struct hfi1_asic_data *ad, int num)
{
struct hfi1_i2c_bus *bus;
int ret;
bus = kzalloc(sizeof(*bus), GFP_KERNEL);
if (!bus)
return NULL;
bus->controlling_dd = dd;
bus->num = num; /* our bus number */
bus->algo.setsda = hfi1_setsda;
bus->algo.setscl = hfi1_setscl;
bus->algo.getsda = hfi1_getsda;
bus->algo.getscl = hfi1_getscl;
bus->algo.udelay = 5;
bus->algo.timeout = usecs_to_jiffies(50);
bus->algo.data = bus;
bus->adapter.owner = THIS_MODULE;
bus->adapter.algo_data = &bus->algo;
bus->adapter.dev.parent = &dd->pcidev->dev;
snprintf(bus->adapter.name, sizeof(bus->adapter.name),
"hfi1_i2c%d", num);
ret = i2c_bit_add_bus(&bus->adapter);
if (ret) {
dd_dev_info(dd, "%s: unable to add i2c bus %d, err %d\n",
__func__, num, ret);
kfree(bus);
return NULL;
}
return bus;
}
/*
* Initialize i2c buses.
* Return 0 on success, -errno on error.
*/
int set_up_i2c(struct hfi1_devdata *dd, struct hfi1_asic_data *ad)
{
ad->i2c_bus0 = init_i2c_bus(dd, ad, 0);
ad->i2c_bus1 = init_i2c_bus(dd, ad, 1);
if (!ad->i2c_bus0 || !ad->i2c_bus1)
return -ENOMEM;
return 0;
};
static void clean_i2c_bus(struct hfi1_i2c_bus *bus)
{
if (bus) {
i2c_del_adapter(&bus->adapter);
kfree(bus);
}
}
void clean_up_i2c(struct hfi1_devdata *dd, struct hfi1_asic_data *ad)
{
clean_i2c_bus(ad->i2c_bus0);
ad->i2c_bus0 = NULL;
clean_i2c_bus(ad->i2c_bus1);
ad->i2c_bus1 = NULL;
}
static int i2c_bus_write(struct hfi1_devdata *dd, struct hfi1_i2c_bus *i2c,
u8 slave_addr, int offset, int offset_size,
u8 *data, u16 len)
{
int ret;
int num_msgs;
u8 offset_bytes[2];
struct i2c_msg msgs[2];
switch (offset_size) {
case 0:
num_msgs = 1;
msgs[0].addr = slave_addr;
msgs[0].flags = 0;
msgs[0].len = len;
msgs[0].buf = data;
break;
case 2:
offset_bytes[1] = (offset >> 8) & 0xff;
/* fall through */
case 1:
num_msgs = 2;
offset_bytes[0] = offset & 0xff;
msgs[0].addr = slave_addr;
msgs[0].flags = 0;
msgs[0].len = offset_size;
msgs[0].buf = offset_bytes;
msgs[1].addr = slave_addr;
msgs[1].flags = I2C_M_NOSTART,
msgs[1].len = len;
msgs[1].buf = data;
break;
default:
return -EINVAL;
}
i2c->controlling_dd = dd;
ret = i2c_transfer(&i2c->adapter, msgs, num_msgs);
if (ret != num_msgs) {
dd_dev_err(dd, "%s: bus %d, i2c slave 0x%x, offset 0x%x, len 0x%x; write failed, ret %d\n",
__func__, i2c->num, slave_addr, offset, len, ret);
return ret < 0 ? ret : -EIO;
}
return 0;
}
static int i2c_bus_read(struct hfi1_devdata *dd, struct hfi1_i2c_bus *bus,
u8 slave_addr, int offset, int offset_size,
u8 *data, u16 len)
{
int ret;
int num_msgs;
u8 offset_bytes[2];
struct i2c_msg msgs[2];
switch (offset_size) {
case 0:
num_msgs = 1;
msgs[0].addr = slave_addr;
msgs[0].flags = I2C_M_RD;
msgs[0].len = len;
msgs[0].buf = data;
break;
case 2:
offset_bytes[1] = (offset >> 8) & 0xff;
/* fall through */
case 1:
num_msgs = 2;
offset_bytes[0] = offset & 0xff;
msgs[0].addr = slave_addr;
msgs[0].flags = 0;
msgs[0].len = offset_size;
msgs[0].buf = offset_bytes;
msgs[1].addr = slave_addr;
msgs[1].flags = I2C_M_RD,
msgs[1].len = len;
msgs[1].buf = data;
break;
default:
return -EINVAL;
}
bus->controlling_dd = dd;
ret = i2c_transfer(&bus->adapter, msgs, num_msgs);
if (ret != num_msgs) {
dd_dev_err(dd, "%s: bus %d, i2c slave 0x%x, offset 0x%x, len 0x%x; read failed, ret %d\n",
__func__, bus->num, slave_addr, offset, len, ret);
return ret < 0 ? ret : -EIO;
}
return 0;
}
/*
* Raw i2c write. No set-up or lock checking.
*
* Return 0 on success, -errno on error.
*/
static int __i2c_write(struct hfi1_pportdata *ppd, u32 target, int i2c_addr,
int offset, void *bp, int len)
{
struct hfi1_devdata *dd = ppd->dd;
int ret, cnt;
u8 *buff = bp;
struct hfi1_i2c_bus *bus;
u8 slave_addr;
int offset_size;
cnt = 0;
while (cnt < len) {
int wlen = len - cnt;
ret = hfi1_twsi_blk_wr(dd, target, i2c_addr, offset,
buff + cnt, wlen);
if (ret) {
/* hfi1_twsi_blk_wr() 1 for error, else 0 */
return -EIO;
}
offset += wlen;
cnt += wlen;
}
/* Must wait min 20us between qsfp i2c transactions */
udelay(20);
return cnt;
bus = target ? dd->asic_data->i2c_bus1 : dd->asic_data->i2c_bus0;
slave_addr = (i2c_addr & 0xff) >> 1; /* convert to 7-bit addr */
offset_size = (i2c_addr >> 8) & 0x3;
return i2c_bus_write(dd, bus, slave_addr, offset, offset_size, bp, len);
}
/*
* Caller must hold the i2c chain resource.
*
* Return number of bytes written, or -errno.
*/
int i2c_write(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, int offset,
void *bp, int len)
@ -99,63 +338,36 @@ int i2c_write(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, int offset,
if (!check_chip_resource(ppd->dd, i2c_target(target), __func__))
return -EACCES;
/* make sure the TWSI bus is in a sane state */
ret = hfi1_twsi_reset(ppd->dd, target);
if (ret) {
hfi1_dev_porterr(ppd->dd, ppd->port,
"I2C chain %d write interface reset failed\n",
target);
ret = __i2c_write(ppd, target, i2c_addr, offset, bp, len);
if (ret)
return ret;
}
return __i2c_write(ppd, target, i2c_addr, offset, bp, len);
return len;
}
/*
* Raw i2c read. No set-up or lock checking.
*
* Return 0 on success, -errno on error.
*/
static int __i2c_read(struct hfi1_pportdata *ppd, u32 target, int i2c_addr,
int offset, void *bp, int len)
{
struct hfi1_devdata *dd = ppd->dd;
int ret, cnt, pass = 0;
int orig_offset = offset;
struct hfi1_i2c_bus *bus;
u8 slave_addr;
int offset_size;
cnt = 0;
while (cnt < len) {
int rlen = len - cnt;
ret = hfi1_twsi_blk_rd(dd, target, i2c_addr, offset,
bp + cnt, rlen);
/* Some QSFP's fail first try. Retry as experiment */
if (ret && cnt == 0 && ++pass < I2C_MAX_RETRY)
continue;
if (ret) {
/* hfi1_twsi_blk_rd() 1 for error, else 0 */
ret = -EIO;
goto exit;
}
offset += rlen;
cnt += rlen;
}
ret = cnt;
exit:
if (ret < 0) {
hfi1_dev_porterr(dd, ppd->port,
"I2C chain %d read failed, addr 0x%x, offset 0x%x, len %d\n",
target, i2c_addr, orig_offset, len);
}
/* Must wait min 20us between qsfp i2c transactions */
udelay(20);
return ret;
bus = target ? dd->asic_data->i2c_bus1 : dd->asic_data->i2c_bus0;
slave_addr = (i2c_addr & 0xff) >> 1; /* convert to 7-bit addr */
offset_size = (i2c_addr >> 8) & 0x3;
return i2c_bus_read(dd, bus, slave_addr, offset, offset_size, bp, len);
}
/*
* Caller must hold the i2c chain resource.
*
* Return number of bytes read, or -errno.
*/
int i2c_read(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, int offset,
void *bp, int len)
@ -165,16 +377,11 @@ int i2c_read(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, int offset,
if (!check_chip_resource(ppd->dd, i2c_target(target), __func__))
return -EACCES;
/* make sure the TWSI bus is in a sane state */
ret = hfi1_twsi_reset(ppd->dd, target);
if (ret) {
hfi1_dev_porterr(ppd->dd, ppd->port,
"I2C chain %d read interface reset failed\n",
target);
ret = __i2c_read(ppd, target, i2c_addr, offset, bp, len);
if (ret)
return ret;
}
return __i2c_read(ppd, target, i2c_addr, offset, bp, len);
return len;
}
/*
@ -182,6 +389,8 @@ int i2c_read(struct hfi1_pportdata *ppd, u32 target, int i2c_addr, int offset,
* by writing @addr = ((256 * n) + m)
*
* Caller must hold the i2c chain resource.
*
* Return number of bytes written or -errno.
*/
int qsfp_write(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
int len)
@ -189,21 +398,12 @@ int qsfp_write(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
int count = 0;
int offset;
int nwrite;
int ret;
int ret = 0;
u8 page;
if (!check_chip_resource(ppd->dd, i2c_target(target), __func__))
return -EACCES;
/* make sure the TWSI bus is in a sane state */
ret = hfi1_twsi_reset(ppd->dd, target);
if (ret) {
hfi1_dev_porterr(ppd->dd, ppd->port,
"QSFP chain %d write interface reset failed\n",
target);
return ret;
}
while (count < len) {
/*
* Set the qsfp page based on a zero-based address
@ -213,11 +413,12 @@ int qsfp_write(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
ret = __i2c_write(ppd, target, QSFP_DEV | QSFP_OFFSET_SIZE,
QSFP_PAGE_SELECT_BYTE_OFFS, &page, 1);
if (ret != 1) {
/* QSFPs require a 5-10msec delay after write operations */
mdelay(5);
if (ret) {
hfi1_dev_porterr(ppd->dd, ppd->port,
"QSFP chain %d can't write QSFP_PAGE_SELECT_BYTE: %d\n",
target, ret);
ret = -EIO;
break;
}
@ -229,11 +430,13 @@ int qsfp_write(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
ret = __i2c_write(ppd, target, QSFP_DEV | QSFP_OFFSET_SIZE,
offset, bp + count, nwrite);
if (ret <= 0) /* stop on error or nothing written */
/* QSFPs require a 5-10msec delay after write operations */
mdelay(5);
if (ret) /* stop on error */
break;
count += ret;
addr += ret;
count += nwrite;
addr += nwrite;
}
if (ret < 0)
@ -266,6 +469,8 @@ int one_qsfp_write(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
* by reading @addr = ((256 * n) + m)
*
* Caller must hold the i2c chain resource.
*
* Return the number of bytes read or -errno.
*/
int qsfp_read(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
int len)
@ -273,21 +478,12 @@ int qsfp_read(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
int count = 0;
int offset;
int nread;
int ret;
int ret = 0;
u8 page;
if (!check_chip_resource(ppd->dd, i2c_target(target), __func__))
return -EACCES;
/* make sure the TWSI bus is in a sane state */
ret = hfi1_twsi_reset(ppd->dd, target);
if (ret) {
hfi1_dev_porterr(ppd->dd, ppd->port,
"QSFP chain %d read interface reset failed\n",
target);
return ret;
}
while (count < len) {
/*
* Set the qsfp page based on a zero-based address
@ -296,11 +492,12 @@ int qsfp_read(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
page = (u8)(addr / QSFP_PAGESIZE);
ret = __i2c_write(ppd, target, QSFP_DEV | QSFP_OFFSET_SIZE,
QSFP_PAGE_SELECT_BYTE_OFFS, &page, 1);
if (ret != 1) {
/* QSFPs require a 5-10msec delay after write operations */
mdelay(5);
if (ret) {
hfi1_dev_porterr(ppd->dd, ppd->port,
"QSFP chain %d can't write QSFP_PAGE_SELECT_BYTE: %d\n",
target, ret);
ret = -EIO;
break;
}
@ -310,15 +507,13 @@ int qsfp_read(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
if (((addr % QSFP_RW_BOUNDARY) + nread) > QSFP_RW_BOUNDARY)
nread = QSFP_RW_BOUNDARY - (addr % QSFP_RW_BOUNDARY);
/* QSFPs require a 5-10msec delay after write operations */
mdelay(5);
ret = __i2c_read(ppd, target, QSFP_DEV | QSFP_OFFSET_SIZE,
offset, bp + count, nread);
if (ret <= 0) /* stop on error or nothing read */
if (ret) /* stop on error */
break;
count += ret;
addr += ret;
count += nread;
addr += nread;
}
if (ret < 0)

3
drivers/infiniband/hw/hfi1/qsfp.h
View File

@ -238,3 +238,6 @@ int one_qsfp_write(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
int len);
int one_qsfp_read(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
int len);
struct hfi1_asic_data;
int set_up_i2c(struct hfi1_devdata *dd, struct hfi1_asic_data *ad);
void clean_up_i2c(struct hfi1_devdata *dd, struct hfi1_asic_data *ad);