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kernel/drivers/thunderbolt/tmu.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Thunderbolt Time Management Unit (TMU) support
*
* Copyright (C) 2019, Intel Corporation
* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
* Rajmohan Mani <rajmohan.mani@intel.com>
*/
#include <linux/delay.h>
#include "tb.h"
static const unsigned int tmu_rates[] = {
[TB_SWITCH_TMU_MODE_OFF] = 0,
[TB_SWITCH_TMU_MODE_LOWRES] = 1000,
[TB_SWITCH_TMU_MODE_HIFI_UNI] = 16,
[TB_SWITCH_TMU_MODE_HIFI_BI] = 16,
[TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI] = 16,
};
static const struct {
unsigned int freq_meas_window;
unsigned int avg_const;
unsigned int delta_avg_const;
unsigned int repl_timeout;
unsigned int repl_threshold;
unsigned int repl_n;
unsigned int dirswitch_n;
} tmu_params[] = {
[TB_SWITCH_TMU_MODE_OFF] = { },
[TB_SWITCH_TMU_MODE_LOWRES] = { 30, 4, },
[TB_SWITCH_TMU_MODE_HIFI_UNI] = { 800, 8, },
[TB_SWITCH_TMU_MODE_HIFI_BI] = { 800, 8, },
[TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI] = {
800, 4, 0, 3125, 25, 128, 255,
},
};
static const char *tmu_mode_name(enum tb_switch_tmu_mode mode)
{
switch (mode) {
case TB_SWITCH_TMU_MODE_OFF:
return "off";
case TB_SWITCH_TMU_MODE_LOWRES:
return "uni-directional, LowRes";
case TB_SWITCH_TMU_MODE_HIFI_UNI:
return "uni-directional, HiFi";
case TB_SWITCH_TMU_MODE_HIFI_BI:
return "bi-directional, HiFi";
case TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI:
return "enhanced uni-directional, MedRes";
default:
return "unknown";
}
}
static bool tb_switch_tmu_enhanced_is_supported(const struct tb_switch *sw)
{
return usb4_switch_version(sw) > 1;
}
static int tb_switch_set_tmu_mode_params(struct tb_switch *sw,
enum tb_switch_tmu_mode mode)
{
u32 freq, avg, val;
int ret;
freq = tmu_params[mode].freq_meas_window;
avg = tmu_params[mode].avg_const;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_0, 1);
if (ret)
return ret;
val &= ~TMU_RTR_CS_0_FREQ_WIND_MASK;
val |= FIELD_PREP(TMU_RTR_CS_0_FREQ_WIND_MASK, freq);
ret = tb_sw_write(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_0, 1);
if (ret)
return ret;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_15, 1);
if (ret)
return ret;
val &= ~TMU_RTR_CS_15_FREQ_AVG_MASK &
~TMU_RTR_CS_15_DELAY_AVG_MASK &
~TMU_RTR_CS_15_OFFSET_AVG_MASK &
~TMU_RTR_CS_15_ERROR_AVG_MASK;
val |= FIELD_PREP(TMU_RTR_CS_15_FREQ_AVG_MASK, avg) |
FIELD_PREP(TMU_RTR_CS_15_DELAY_AVG_MASK, avg) |
FIELD_PREP(TMU_RTR_CS_15_OFFSET_AVG_MASK, avg) |
FIELD_PREP(TMU_RTR_CS_15_ERROR_AVG_MASK, avg);
ret = tb_sw_write(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_15, 1);
if (ret)
return ret;
if (tb_switch_tmu_enhanced_is_supported(sw)) {
u32 delta_avg = tmu_params[mode].delta_avg_const;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_18, 1);
if (ret)
return ret;
val &= ~TMU_RTR_CS_18_DELTA_AVG_CONST_MASK;
val |= FIELD_PREP(TMU_RTR_CS_18_DELTA_AVG_CONST_MASK, delta_avg);
ret = tb_sw_write(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_18, 1);
}
return ret;
}
static bool tb_switch_tmu_ucap_is_supported(struct tb_switch *sw)
{
int ret;
u32 val;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_0, 1);
if (ret)
return false;
return !!(val & TMU_RTR_CS_0_UCAP);
}
static int tb_switch_tmu_rate_read(struct tb_switch *sw)
{
int ret;
u32 val;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_3, 1);
if (ret)
return ret;
val >>= TMU_RTR_CS_3_TS_PACKET_INTERVAL_SHIFT;
return val;
}
static int tb_switch_tmu_rate_write(struct tb_switch *sw, int rate)
{
int ret;
u32 val;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_3, 1);
if (ret)
return ret;
val &= ~TMU_RTR_CS_3_TS_PACKET_INTERVAL_MASK;
val |= rate << TMU_RTR_CS_3_TS_PACKET_INTERVAL_SHIFT;
return tb_sw_write(sw, &val, TB_CFG_SWITCH,
sw->tmu.cap + TMU_RTR_CS_3, 1);
}
static int tb_port_tmu_write(struct tb_port *port, u8 offset, u32 mask,
u32 value)
{
u32 data;
int ret;
ret = tb_port_read(port, &data, TB_CFG_PORT, port->cap_tmu + offset, 1);
if (ret)
return ret;
data &= ~mask;
data |= value;
return tb_port_write(port, &data, TB_CFG_PORT,
port->cap_tmu + offset, 1);
}
static int tb_port_tmu_set_unidirectional(struct tb_port *port,
bool unidirectional)
{
u32 val;
if (!port->sw->tmu.has_ucap)
return 0;
val = unidirectional ? TMU_ADP_CS_3_UDM : 0;
return tb_port_tmu_write(port, TMU_ADP_CS_3, TMU_ADP_CS_3_UDM, val);
}
static inline int tb_port_tmu_unidirectional_disable(struct tb_port *port)
{
return tb_port_tmu_set_unidirectional(port, false);
}
static inline int tb_port_tmu_unidirectional_enable(struct tb_port *port)
{
return tb_port_tmu_set_unidirectional(port, true);
}
static bool tb_port_tmu_is_unidirectional(struct tb_port *port)
{
int ret;
u32 val;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_3, 1);
if (ret)
return false;
return val & TMU_ADP_CS_3_UDM;
}
static bool tb_port_tmu_is_enhanced(struct tb_port *port)
{
int ret;
u32 val;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_8, 1);
if (ret)
return false;
return val & TMU_ADP_CS_8_EUDM;
}
/* Can be called to non-v2 lane adapters too */
static int tb_port_tmu_enhanced_enable(struct tb_port *port, bool enable)
{
int ret;
u32 val;
if (!tb_switch_tmu_enhanced_is_supported(port->sw))
return 0;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_8, 1);
if (ret)
return ret;
if (enable)
val |= TMU_ADP_CS_8_EUDM;
else
val &= ~TMU_ADP_CS_8_EUDM;
return tb_port_write(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_8, 1);
}
static int tb_port_set_tmu_mode_params(struct tb_port *port,
enum tb_switch_tmu_mode mode)
{
u32 repl_timeout, repl_threshold, repl_n, dirswitch_n, val;
int ret;
repl_timeout = tmu_params[mode].repl_timeout;
repl_threshold = tmu_params[mode].repl_threshold;
repl_n = tmu_params[mode].repl_n;
dirswitch_n = tmu_params[mode].dirswitch_n;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_8, 1);
if (ret)
return ret;
val &= ~TMU_ADP_CS_8_REPL_TIMEOUT_MASK;
val &= ~TMU_ADP_CS_8_REPL_THRESHOLD_MASK;
val |= FIELD_PREP(TMU_ADP_CS_8_REPL_TIMEOUT_MASK, repl_timeout);
val |= FIELD_PREP(TMU_ADP_CS_8_REPL_THRESHOLD_MASK, repl_threshold);
ret = tb_port_write(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_8, 1);
if (ret)
return ret;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_9, 1);
if (ret)
return ret;
val &= ~TMU_ADP_CS_9_REPL_N_MASK;
val &= ~TMU_ADP_CS_9_DIRSWITCH_N_MASK;
val |= FIELD_PREP(TMU_ADP_CS_9_REPL_N_MASK, repl_n);
val |= FIELD_PREP(TMU_ADP_CS_9_DIRSWITCH_N_MASK, dirswitch_n);
return tb_port_write(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_9, 1);
}
/* Can be called to non-v2 lane adapters too */
static int tb_port_tmu_rate_write(struct tb_port *port, int rate)
{
int ret;
u32 val;
if (!tb_switch_tmu_enhanced_is_supported(port->sw))
return 0;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_9, 1);
if (ret)
return ret;
val &= ~TMU_ADP_CS_9_ADP_TS_INTERVAL_MASK;
val |= FIELD_PREP(TMU_ADP_CS_9_ADP_TS_INTERVAL_MASK, rate);
return tb_port_write(port, &val, TB_CFG_PORT,
port->cap_tmu + TMU_ADP_CS_9, 1);
}
static int tb_port_tmu_time_sync(struct tb_port *port, bool time_sync)
{
u32 val = time_sync ? TMU_ADP_CS_6_DTS : 0;
return tb_port_tmu_write(port, TMU_ADP_CS_6, TMU_ADP_CS_6_DTS, val);
}
static int tb_port_tmu_time_sync_disable(struct tb_port *port)
{
return tb_port_tmu_time_sync(port, true);
}
static int tb_port_tmu_time_sync_enable(struct tb_port *port)
{
return tb_port_tmu_time_sync(port, false);
}
static int tb_switch_tmu_set_time_disruption(struct tb_switch *sw, bool set)
{
u32 val, offset, bit;
int ret;
if (tb_switch_is_usb4(sw)) {
offset = sw->tmu.cap + TMU_RTR_CS_0;
bit = TMU_RTR_CS_0_TD;
} else {
offset = sw->cap_vsec_tmu + TB_TIME_VSEC_3_CS_26;
bit = TB_TIME_VSEC_3_CS_26_TD;
}
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
if (ret)
return ret;
if (set)
val |= bit;
else
val &= ~bit;
return tb_sw_write(sw, &val, TB_CFG_SWITCH, offset, 1);
}
static int tmu_mode_init(struct tb_switch *sw)
{
bool enhanced, ucap;
int ret, rate;
ucap = tb_switch_tmu_ucap_is_supported(sw);
if (ucap)
tb_sw_dbg(sw, "TMU: supports uni-directional mode\n");
enhanced = tb_switch_tmu_enhanced_is_supported(sw);
if (enhanced)
tb_sw_dbg(sw, "TMU: supports enhanced uni-directional mode\n");
ret = tb_switch_tmu_rate_read(sw);
if (ret < 0)
return ret;
rate = ret;
/* Off by default */
sw->tmu.mode = TB_SWITCH_TMU_MODE_OFF;
if (tb_route(sw)) {
struct tb_port *up = tb_upstream_port(sw);
if (enhanced && tb_port_tmu_is_enhanced(up)) {
sw->tmu.mode = TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI;
} else if (ucap && tb_port_tmu_is_unidirectional(up)) {
if (tmu_rates[TB_SWITCH_TMU_MODE_LOWRES] == rate)
sw->tmu.mode = TB_SWITCH_TMU_MODE_LOWRES;
else if (tmu_rates[TB_SWITCH_TMU_MODE_HIFI_UNI] == rate)
sw->tmu.mode = TB_SWITCH_TMU_MODE_HIFI_UNI;
} else if (rate) {
sw->tmu.mode = TB_SWITCH_TMU_MODE_HIFI_BI;
}
} else if (rate) {
sw->tmu.mode = TB_SWITCH_TMU_MODE_HIFI_BI;
}
/* Update the initial request to match the current mode */
sw->tmu.mode_request = sw->tmu.mode;
sw->tmu.has_ucap = ucap;
return 0;
}
/**
* tb_switch_tmu_init() - Initialize switch TMU structures
* @sw: Switch to initialized
*
* This function must be called before other TMU related functions to
* makes the internal structures are filled in correctly. Does not
* change any hardware configuration.
*/
int tb_switch_tmu_init(struct tb_switch *sw)
{
struct tb_port *port;
int ret;
if (tb_switch_is_icm(sw))
return 0;
ret = tb_switch_find_cap(sw, TB_SWITCH_CAP_TMU);
if (ret > 0)
sw->tmu.cap = ret;
tb_switch_for_each_port(sw, port) {
int cap;
cap = tb_port_find_cap(port, TB_PORT_CAP_TIME1);
if (cap > 0)
port->cap_tmu = cap;
}
ret = tmu_mode_init(sw);
if (ret)
return ret;
tb_sw_dbg(sw, "TMU: current mode: %s\n", tmu_mode_name(sw->tmu.mode));
return 0;
}
/**
* tb_switch_tmu_post_time() - Update switch local time
* @sw: Switch whose time to update
*
* Updates switch local time using time posting procedure.
*/
int tb_switch_tmu_post_time(struct tb_switch *sw)
{
unsigned int post_time_high_offset, post_time_high = 0;
unsigned int post_local_time_offset, post_time_offset;
struct tb_switch *root_switch = sw->tb->root_switch;
u64 hi, mid, lo, local_time, post_time;
int i, ret, retries = 100;
u32 gm_local_time[3];
if (!tb_route(sw))
return 0;
if (!tb_switch_is_usb4(sw))
return 0;
/* Need to be able to read the grand master time */
if (!root_switch->tmu.cap)
return 0;
ret = tb_sw_read(root_switch, gm_local_time, TB_CFG_SWITCH,
root_switch->tmu.cap + TMU_RTR_CS_1,
ARRAY_SIZE(gm_local_time));
if (ret)
return ret;
for (i = 0; i < ARRAY_SIZE(gm_local_time); i++)
tb_sw_dbg(root_switch, "TMU: local_time[%d]=0x%08x\n", i,
gm_local_time[i]);
/* Convert to nanoseconds (drop fractional part) */
hi = gm_local_time[2] & TMU_RTR_CS_3_LOCAL_TIME_NS_MASK;
mid = gm_local_time[1];
lo = (gm_local_time[0] & TMU_RTR_CS_1_LOCAL_TIME_NS_MASK) >>
TMU_RTR_CS_1_LOCAL_TIME_NS_SHIFT;
local_time = hi << 48 | mid << 16 | lo;
/* Tell the switch that time sync is disrupted for a while */
ret = tb_switch_tmu_set_time_disruption(sw, true);
if (ret)
return ret;
post_local_time_offset = sw->tmu.cap + TMU_RTR_CS_22;
post_time_offset = sw->tmu.cap + TMU_RTR_CS_24;
post_time_high_offset = sw->tmu.cap + TMU_RTR_CS_25;
/*
* Write the Grandmaster time to the Post Local Time registers
* of the new switch.
*/
ret = tb_sw_write(sw, &local_time, TB_CFG_SWITCH,
post_local_time_offset, 2);
if (ret)
goto out;
/*
* Have the new switch update its local time by:
* 1) writing 0x1 to the Post Time Low register and 0xffffffff to
* Post Time High register.
* 2) write 0 to Post Time High register and then wait for
* the completion of the post_time register becomes 0.
* This means the time has been converged properly.
*/
post_time = 0xffffffff00000001ULL;
ret = tb_sw_write(sw, &post_time, TB_CFG_SWITCH, post_time_offset, 2);
if (ret)
goto out;
ret = tb_sw_write(sw, &post_time_high, TB_CFG_SWITCH,
post_time_high_offset, 1);
if (ret)
goto out;
do {
usleep_range(5, 10);
ret = tb_sw_read(sw, &post_time, TB_CFG_SWITCH,
post_time_offset, 2);
if (ret)
goto out;
} while (--retries && post_time);
if (!retries) {
ret = -ETIMEDOUT;
goto out;
}
tb_sw_dbg(sw, "TMU: updated local time to %#llx\n", local_time);
out:
tb_switch_tmu_set_time_disruption(sw, false);
return ret;
}
static int disable_enhanced(struct tb_port *up, struct tb_port *down)
{
int ret;
/*
* Router may already been disconnected so ignore errors on the
* upstream port.
*/
tb_port_tmu_rate_write(up, 0);
tb_port_tmu_enhanced_enable(up, false);
ret = tb_port_tmu_rate_write(down, 0);
if (ret)
return ret;
return tb_port_tmu_enhanced_enable(down, false);
}
/**
* tb_switch_tmu_disable() - Disable TMU of a switch
* @sw: Switch whose TMU to disable
*
* Turns off TMU of @sw if it is enabled. If not enabled does nothing.
*/
int tb_switch_tmu_disable(struct tb_switch *sw)
{
/* Already disabled? */
if (sw->tmu.mode == TB_SWITCH_TMU_MODE_OFF)
return 0;
if (tb_route(sw)) {
struct tb_port *down, *up;
int ret;
down = tb_switch_downstream_port(sw);
up = tb_upstream_port(sw);
/*
* In case of uni-directional time sync, TMU handshake is
* initiated by upstream router. In case of bi-directional
* time sync, TMU handshake is initiated by downstream router.
* We change downstream router's rate to off for both uni/bidir
* cases although it is needed only for the bi-directional mode.
* We avoid changing upstream router's mode since it might
* have another downstream router plugged, that is set to
* uni-directional mode and we don't want to change it's TMU
* mode.
*/
ret = tb_switch_tmu_rate_write(sw, tmu_rates[TB_SWITCH_TMU_MODE_OFF]);
if (ret)
return ret;
tb_port_tmu_time_sync_disable(up);
ret = tb_port_tmu_time_sync_disable(down);
if (ret)
return ret;
switch (sw->tmu.mode) {
case TB_SWITCH_TMU_MODE_LOWRES:
case TB_SWITCH_TMU_MODE_HIFI_UNI:
/* The switch may be unplugged so ignore any errors */
tb_port_tmu_unidirectional_disable(up);
ret = tb_port_tmu_unidirectional_disable(down);
if (ret)
return ret;
break;
case TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI:
ret = disable_enhanced(up, down);
if (ret)
return ret;
break;
default:
break;
}
} else {
tb_switch_tmu_rate_write(sw, tmu_rates[TB_SWITCH_TMU_MODE_OFF]);
}
sw->tmu.mode = TB_SWITCH_TMU_MODE_OFF;
tb_sw_dbg(sw, "TMU: disabled\n");
return 0;
}
/* Called only when there is failure enabling requested mode */
static void tb_switch_tmu_off(struct tb_switch *sw)
{
unsigned int rate = tmu_rates[TB_SWITCH_TMU_MODE_OFF];
struct tb_port *down, *up;
down = tb_switch_downstream_port(sw);
up = tb_upstream_port(sw);
/*
* In case of any failure in one of the steps when setting
* bi-directional or uni-directional TMU mode, get back to the TMU
* configurations in off mode. In case of additional failures in
* the functions below, ignore them since the caller shall already
* report a failure.
*/
tb_port_tmu_time_sync_disable(down);
tb_port_tmu_time_sync_disable(up);
switch (sw->tmu.mode_request) {
case TB_SWITCH_TMU_MODE_LOWRES:
case TB_SWITCH_TMU_MODE_HIFI_UNI:
tb_switch_tmu_rate_write(tb_switch_parent(sw), rate);
break;
case TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI:
disable_enhanced(up, down);
break;
default:
break;
}
/* Always set the rate to 0 */
tb_switch_tmu_rate_write(sw, rate);
tb_switch_set_tmu_mode_params(sw, sw->tmu.mode);
tb_port_tmu_unidirectional_disable(down);
tb_port_tmu_unidirectional_disable(up);
}
/*
* This function is called when the previous TMU mode was
* TB_SWITCH_TMU_MODE_OFF.
*/
static int tb_switch_tmu_enable_bidirectional(struct tb_switch *sw)
{
struct tb_port *up, *down;
int ret;
up = tb_upstream_port(sw);
down = tb_switch_downstream_port(sw);
ret = tb_port_tmu_unidirectional_disable(up);
if (ret)
return ret;
ret = tb_port_tmu_unidirectional_disable(down);
if (ret)
goto out;
ret = tb_switch_tmu_rate_write(sw, tmu_rates[TB_SWITCH_TMU_MODE_HIFI_BI]);
if (ret)
goto out;
ret = tb_port_tmu_time_sync_enable(up);
if (ret)
goto out;
ret = tb_port_tmu_time_sync_enable(down);
if (ret)
goto out;
return 0;
out:
tb_switch_tmu_off(sw);
return ret;
}
/* Only needed for Titan Ridge */
static int tb_switch_tmu_disable_objections(struct tb_switch *sw)
{
struct tb_port *up = tb_upstream_port(sw);
u32 val;
int ret;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
sw->cap_vsec_tmu + TB_TIME_VSEC_3_CS_9, 1);
if (ret)
return ret;
val &= ~TB_TIME_VSEC_3_CS_9_TMU_OBJ_MASK;
ret = tb_sw_write(sw, &val, TB_CFG_SWITCH,
sw->cap_vsec_tmu + TB_TIME_VSEC_3_CS_9, 1);
if (ret)
return ret;
return tb_port_tmu_write(up, TMU_ADP_CS_6,
TMU_ADP_CS_6_DISABLE_TMU_OBJ_MASK,
TMU_ADP_CS_6_DISABLE_TMU_OBJ_CL1 |
TMU_ADP_CS_6_DISABLE_TMU_OBJ_CL2);
}
/*
* This function is called when the previous TMU mode was
* TB_SWITCH_TMU_MODE_OFF.
*/
static int tb_switch_tmu_enable_unidirectional(struct tb_switch *sw)
{
struct tb_port *up, *down;
int ret;
up = tb_upstream_port(sw);
down = tb_switch_downstream_port(sw);
ret = tb_switch_tmu_rate_write(tb_switch_parent(sw),
tmu_rates[sw->tmu.mode_request]);
if (ret)
return ret;
ret = tb_switch_set_tmu_mode_params(sw, sw->tmu.mode_request);
if (ret)
return ret;
ret = tb_port_tmu_unidirectional_enable(up);
if (ret)
goto out;
ret = tb_port_tmu_time_sync_enable(up);
if (ret)
goto out;
ret = tb_port_tmu_unidirectional_enable(down);
if (ret)
goto out;
ret = tb_port_tmu_time_sync_enable(down);
if (ret)
goto out;
return 0;
out:
tb_switch_tmu_off(sw);
return ret;
}
/*
* This function is called when the previous TMU mode was
* TB_SWITCH_TMU_RATE_OFF.
*/
static int tb_switch_tmu_enable_enhanced(struct tb_switch *sw)
{
unsigned int rate = tmu_rates[sw->tmu.mode_request];
struct tb_port *up, *down;
int ret;
/* Router specific parameters first */
ret = tb_switch_set_tmu_mode_params(sw, sw->tmu.mode_request);
if (ret)
return ret;
up = tb_upstream_port(sw);
down = tb_switch_downstream_port(sw);
ret = tb_port_set_tmu_mode_params(up, sw->tmu.mode_request);
if (ret)
goto out;
ret = tb_port_tmu_rate_write(up, rate);
if (ret)
goto out;
ret = tb_port_tmu_enhanced_enable(up, true);
if (ret)
goto out;
ret = tb_port_set_tmu_mode_params(down, sw->tmu.mode_request);
if (ret)
goto out;
ret = tb_port_tmu_rate_write(down, rate);
if (ret)
goto out;
ret = tb_port_tmu_enhanced_enable(down, true);
if (ret)
goto out;
return 0;
out:
tb_switch_tmu_off(sw);
return ret;
}
static void tb_switch_tmu_change_mode_prev(struct tb_switch *sw)
{
unsigned int rate = tmu_rates[sw->tmu.mode];
struct tb_port *down, *up;
down = tb_switch_downstream_port(sw);
up = tb_upstream_port(sw);
/*
* In case of any failure in one of the steps when change mode,
* get back to the TMU configurations in previous mode.
* In case of additional failures in the functions below,
* ignore them since the caller shall already report a failure.
*/
switch (sw->tmu.mode) {
case TB_SWITCH_TMU_MODE_LOWRES:
case TB_SWITCH_TMU_MODE_HIFI_UNI:
tb_port_tmu_set_unidirectional(down, true);
tb_switch_tmu_rate_write(tb_switch_parent(sw), rate);
break;
case TB_SWITCH_TMU_MODE_HIFI_BI:
tb_port_tmu_set_unidirectional(down, false);
tb_switch_tmu_rate_write(sw, rate);
break;
default:
break;
}
tb_switch_set_tmu_mode_params(sw, sw->tmu.mode);
switch (sw->tmu.mode) {
case TB_SWITCH_TMU_MODE_LOWRES:
case TB_SWITCH_TMU_MODE_HIFI_UNI:
tb_port_tmu_set_unidirectional(up, true);
break;
case TB_SWITCH_TMU_MODE_HIFI_BI:
tb_port_tmu_set_unidirectional(up, false);
break;
default:
break;
}
}
static int tb_switch_tmu_change_mode(struct tb_switch *sw)
{
unsigned int rate = tmu_rates[sw->tmu.mode_request];
struct tb_port *up, *down;
int ret;
up = tb_upstream_port(sw);
down = tb_switch_downstream_port(sw);
/* Program the upstream router downstream facing lane adapter */
switch (sw->tmu.mode_request) {
case TB_SWITCH_TMU_MODE_LOWRES:
case TB_SWITCH_TMU_MODE_HIFI_UNI:
ret = tb_port_tmu_set_unidirectional(down, true);
if (ret)
goto out;
ret = tb_switch_tmu_rate_write(tb_switch_parent(sw), rate);
if (ret)
goto out;
break;
case TB_SWITCH_TMU_MODE_HIFI_BI:
ret = tb_port_tmu_set_unidirectional(down, false);
if (ret)
goto out;
ret = tb_switch_tmu_rate_write(sw, rate);
if (ret)
goto out;
break;
default:
/* Not allowed to change modes from other than above */
return -EINVAL;
}
ret = tb_switch_set_tmu_mode_params(sw, sw->tmu.mode_request);
if (ret)
goto out;
/* Program the new mode and the downstream router lane adapter */
switch (sw->tmu.mode_request) {
case TB_SWITCH_TMU_MODE_LOWRES:
case TB_SWITCH_TMU_MODE_HIFI_UNI:
ret = tb_port_tmu_set_unidirectional(up, true);
if (ret)
goto out;
break;
case TB_SWITCH_TMU_MODE_HIFI_BI:
ret = tb_port_tmu_set_unidirectional(up, false);
if (ret)
goto out;
break;
default:
/* Not allowed to change modes from other than above */
return -EINVAL;
}
ret = tb_port_tmu_time_sync_enable(down);
if (ret)
goto out;
ret = tb_port_tmu_time_sync_enable(up);
if (ret)
goto out;
return 0;
out:
tb_switch_tmu_change_mode_prev(sw);
return ret;
}
/**
* tb_switch_tmu_enable() - Enable TMU on a router
* @sw: Router whose TMU to enable
*
* Enables TMU of a router to be in uni-directional Normal/HiFi or
* bi-directional HiFi mode. Calling tb_switch_tmu_configure() is
* required before calling this function.
*/
int tb_switch_tmu_enable(struct tb_switch *sw)
{
int ret;
if (tb_switch_tmu_is_enabled(sw))
return 0;
if (tb_switch_is_titan_ridge(sw) &&
(sw->tmu.mode_request == TB_SWITCH_TMU_MODE_LOWRES ||
sw->tmu.mode_request == TB_SWITCH_TMU_MODE_HIFI_UNI)) {
ret = tb_switch_tmu_disable_objections(sw);
if (ret)
return ret;
}
ret = tb_switch_tmu_set_time_disruption(sw, true);
if (ret)
return ret;
if (tb_route(sw)) {
/*
* The used mode changes are from OFF to
* HiFi-Uni/HiFi-BiDir/Normal-Uni or from Normal-Uni to
* HiFi-Uni.
*/
if (sw->tmu.mode == TB_SWITCH_TMU_MODE_OFF) {
switch (sw->tmu.mode_request) {
case TB_SWITCH_TMU_MODE_LOWRES:
case TB_SWITCH_TMU_MODE_HIFI_UNI:
ret = tb_switch_tmu_enable_unidirectional(sw);
break;
case TB_SWITCH_TMU_MODE_HIFI_BI:
ret = tb_switch_tmu_enable_bidirectional(sw);
break;
case TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI:
ret = tb_switch_tmu_enable_enhanced(sw);
break;
default:
ret = -EINVAL;
break;
}
} else if (sw->tmu.mode == TB_SWITCH_TMU_MODE_LOWRES ||
sw->tmu.mode == TB_SWITCH_TMU_MODE_HIFI_UNI ||
sw->tmu.mode == TB_SWITCH_TMU_MODE_HIFI_BI) {
ret = tb_switch_tmu_change_mode(sw);
} else {
ret = -EINVAL;
}
} else {
/*
* Host router port configurations are written as
* part of configurations for downstream port of the parent
* of the child node - see above.
* Here only the host router' rate configuration is written.
*/
ret = tb_switch_tmu_rate_write(sw, tmu_rates[sw->tmu.mode_request]);
}
if (ret) {
tb_sw_warn(sw, "TMU: failed to enable mode %s: %d\n",
tmu_mode_name(sw->tmu.mode_request), ret);
} else {
sw->tmu.mode = sw->tmu.mode_request;
tb_sw_dbg(sw, "TMU: mode set to: %s\n", tmu_mode_name(sw->tmu.mode));
}
return tb_switch_tmu_set_time_disruption(sw, false);
}
/**
* tb_switch_tmu_configure() - Configure the TMU mode
* @sw: Router whose mode to change
* @mode: Mode to configure
*
* Selects the TMU mode that is enabled when tb_switch_tmu_enable() is
* next called.
*
* Returns %0 in success and negative errno otherwise. Specifically
* returns %-EOPNOTSUPP if the requested mode is not possible (not
* supported by the router and/or topology).
*/
int tb_switch_tmu_configure(struct tb_switch *sw, enum tb_switch_tmu_mode mode)
{
switch (mode) {
case TB_SWITCH_TMU_MODE_OFF:
break;
case TB_SWITCH_TMU_MODE_LOWRES:
case TB_SWITCH_TMU_MODE_HIFI_UNI:
if (!sw->tmu.has_ucap)
return -EOPNOTSUPP;
break;
case TB_SWITCH_TMU_MODE_HIFI_BI:
break;
case TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI: {
const struct tb_switch *parent_sw = tb_switch_parent(sw);
if (!parent_sw || !tb_switch_tmu_enhanced_is_supported(parent_sw))
return -EOPNOTSUPP;
if (!tb_switch_tmu_enhanced_is_supported(sw))
return -EOPNOTSUPP;
break;
}
default:
tb_sw_warn(sw, "TMU: unsupported mode %u\n", mode);
return -EINVAL;
}
if (sw->tmu.mode_request != mode) {
tb_sw_dbg(sw, "TMU: mode change %s -> %s requested\n",
tmu_mode_name(sw->tmu.mode), tmu_mode_name(mode));
sw->tmu.mode_request = mode;
}
return 0;
}
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