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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 "board.h"
#include "common.h"
#include "console.h"
#include "debug.h"
#include "hooks.h"
#include "registers.h"
#include "util.h"
#include "usb_pd.h"
/* ------------------------- Power supply control ------------------------ */
/* GPIO level setting helpers through BSRR register */
#define GPIO_SET(n) (1 << (n))
#define GPIO_RESET(n) (1 << ((n) + 16))
/* Output voltage selection */
enum volt {
VO_5V = GPIO_RESET(13) | GPIO_RESET(14),
VO_12V = GPIO_SET(13) | GPIO_RESET(14),
VO_13V = GPIO_RESET(13) | GPIO_SET(14),
VO_20V = GPIO_SET(13) | GPIO_SET(14),
};
static inline void set_output_voltage(enum volt v)
{
/* set voltage_select on PA13/PA14 */
STM32_GPIO_BSRR(GPIO_A) = v;
}
static inline void output_enable(void)
{
/* GPF0 (FET driver shutdown) = 0 */
STM32_GPIO_BSRR(GPIO_F) = GPIO_RESET(0);
}
static inline void output_disable(void)
{
/* GPF0 (FET driver shutdown) = 1 */
STM32_GPIO_BSRR(GPIO_F) = GPIO_SET(0);
}
/* ----------------------- USB Power delivery policy ---------------------- */
/* Power Delivery Objects */
const uint32_t pd_src_pdo[] = {
PDO_FIXED(5000, 500, PDO_FIXED_EXTERNAL),
PDO_FIXED(5000, 3000, 0),
PDO_FIXED(12000, 3000, 0),
PDO_FIXED(20000, 2000, 0),
};
const int pd_src_pdo_cnt = ARRAY_SIZE(pd_src_pdo);
/* PDO voltages (should match the table above) */
static enum volt voltages[ARRAY_SIZE(pd_src_pdo)] = {
VO_5V,
VO_5V,
VO_12V,
VO_20V,
};
int pd_request_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_cnt)
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 */
debug_printf("Switch to %d V %d mA (for %d/%d mA)\n",
((pdo >> 10) & 0x3ff) * 50, (pdo & 0x3ff) * 10,
((rdo >> 10) & 0x3ff) * 10, (rdo & 0x3ff) * 10);
output_disable();
/* TODO discharge ? */
set_output_voltage(voltages[idx-1]);
return EC_SUCCESS;
}
int pd_set_power_supply_ready(void)
{
output_enable();
return EC_SUCCESS; /* we are ready */
}
void pd_power_supply_reset(void)
{
output_disable();
/* TODO discharge ? */
set_output_voltage(VO_5V);
/* TODO transition delay */
}
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