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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "adc.h"
#include "board.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "registers.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#include "usb_pd.h"
#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
/* Acceptable margin between requested VBUS and measured value */
#define MARGIN_MV 400 /* mV */
/* Define typical operating power and max power */
#define OPERATING_POWER_MW 5000
#define MAX_POWER_MW 60000
#define MAX_CURRENT_MA 3000
#define PDO_FIXED_FLAGS (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP | \
PDO_FIXED_EXTERNAL)
/* Source PDOs */
const uint32_t pd_src_pdo[] = {
PDO_FIXED(5000, 3000, PDO_FIXED_FLAGS),
PDO_FIXED(12000, 3000, PDO_FIXED_FLAGS),
PDO_FIXED(20000, 3000, PDO_FIXED_FLAGS),
};
static const int pd_src_pdo_cnts[3] = {
[SRC_CAP_5V] = 1,
[SRC_CAP_12V] = 2,
[SRC_CAP_20V] = 3,
};
static int pd_src_pdo_idx;
/* Fake PDOs : we just want our pre-defined voltages */
const uint32_t pd_snk_pdo[] = {
PDO_FIXED(5000, 500, PDO_FIXED_FLAGS),
PDO_FIXED(12000, 500, PDO_FIXED_FLAGS),
PDO_FIXED(20000, 500, PDO_FIXED_FLAGS),
};
const int pd_snk_pdo_cnt = ARRAY_SIZE(pd_snk_pdo);
/* Desired voltage requested as a sink (in millivolts) */
static unsigned select_mv = 5000;
void board_set_source_cap(enum board_src_cap cap)
{
pd_src_pdo_idx = cap;
}
int pd_get_source_pdo(const uint32_t **src_pdo)
{
*src_pdo = pd_src_pdo;
return pd_src_pdo_cnts[pd_src_pdo_idx];
}
int pd_choose_voltage(int cnt, uint32_t *src_caps, uint32_t *rdo,
uint32_t *curr_limit, uint32_t *supply_voltage)
{
int i;
int ma;
int set_mv = select_mv;
int max;
uint32_t flags;
/* Default to 5V */
if (set_mv <= 0)
set_mv = 5000;
/* Get the selected voltage */
for (i = cnt; i >= 0; i--) {
int mv = ((src_caps[i] >> 10) & 0x3FF) * 50;
int type = src_caps[i] & PDO_TYPE_MASK;
if ((mv == set_mv) && (type == PDO_TYPE_FIXED))
break;
}
if (i < 0)
return -EC_ERROR_UNKNOWN;
/* build rdo for desired power */
ma = 10 * (src_caps[i] & 0x3FF);
max = MIN(ma, MAX_CURRENT_MA);
flags = (max * set_mv) < (1000 * OPERATING_POWER_MW) ?
RDO_CAP_MISMATCH : 0;
*rdo = RDO_FIXED(i + 1, max, max, 0);
CPRINTF("Request [%d] %dV %dmA", i, set_mv/1000, max);
/* Mismatch bit set if less power offered than the operating power */
if (flags & RDO_CAP_MISMATCH)
CPRINTF(" Mismatch");
CPRINTF("\n");
*curr_limit = max;
*supply_voltage = set_mv;
return EC_SUCCESS;
}
void pd_set_input_current_limit(int port, uint32_t max_ma,
uint32_t supply_voltage)
{
/* No battery, nothing to do */
return;
}
void pd_set_max_voltage(unsigned mv)
{
select_mv = mv;
}
int pd_check_requested_voltage(uint32_t rdo)
{
int op_ma = rdo & 0x3FF;
int max_ma = (rdo >> 10) & 0x3FF;
int idx = rdo >> 28;
uint32_t pdo;
uint32_t pdo_ma;
if (!idx || idx > pd_src_pdo_cnts[pd_src_pdo_idx])
return EC_ERROR_INVAL; /* Invalid index */
/* check current ... */
pdo = pd_src_pdo[idx - 1];
pdo_ma = (pdo & 0x3ff);
if (op_ma > pdo_ma)
return EC_ERROR_INVAL; /* too much op current */
if (max_ma > pdo_ma)
return EC_ERROR_INVAL; /* too much max current */
CPRINTF("Requested %d V %d mA (for %d/%d mA)\n",
((pdo >> 10) & 0x3ff) * 50, (pdo & 0x3ff) * 10,
((rdo >> 10) & 0x3ff) * 10, (rdo & 0x3ff) * 10);
return EC_SUCCESS;
}
void pd_transition_voltage(int idx)
{
gpio_set_level(GPIO_USBC_VSEL_0, idx >= 2);
gpio_set_level(GPIO_USBC_VSEL_1, idx >= 3);
}
int pd_set_power_supply_ready(int port)
{
/* Output the correct voltage */
gpio_set_level(GPIO_VBUS_CHARGER_EN, 1);
return EC_SUCCESS;
}
void pd_power_supply_reset(int port)
{
/* Kill VBUS */
gpio_set_level(GPIO_VBUS_CHARGER_EN, 0);
gpio_set_level(GPIO_USBC_VSEL_0, 0);
gpio_set_level(GPIO_USBC_VSEL_1, 0);
}
int pd_board_checks(void)
{
static int was_connected = -1;
if (was_connected != 1 && pd_is_connected(0))
board_maybe_reset_usb_hub();
was_connected = pd_is_connected(0);
return EC_SUCCESS;
}
int pd_check_power_swap(int port)
{
/* Always allow power swap */
return 1;
}
int pd_check_data_swap(int port, int data_role)
{
/* Always allow data swap */
return 1;
}
void pd_execute_data_swap(int port, int data_role)
{
/* Do nothing */
}
void pd_new_contract(int port, int pr_role, int dr_role,
int partner_pr_swap, int partner_dr_swap)
{
}
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