/* * Copyright (c) 2019 Intel Corporation * * SPDX-License-Identifier: Apache-2.0 */ #define DT_DRV_COMPAT microchip_xec_ps2 #include #include #include #include #include #define LOG_LEVEL CONFIG_PS2_LOG_LEVEL LOG_MODULE_REGISTER(ps2_mchp_xec); /* in 50us units */ #define PS2_TIMEOUT 10000 struct ps2_xec_config { PS2_Type *base; uint8_t girq_id; uint8_t girq_bit; uint8_t isr_nvic; }; struct ps2_xec_data { ps2_callback_t callback_isr; struct k_sem tx_lock; }; static int ps2_xec_configure(const struct device *dev, ps2_callback_t callback_isr) { const struct ps2_xec_config *config = dev->config; struct ps2_xec_data *data = dev->data; PS2_Type *base = config->base; uint8_t __attribute__((unused)) dummy; if (!callback_isr) { return -EINVAL; } data->callback_isr = callback_isr; /* In case the self test for a PS2 device already finished and * set the SOURCE bit to 1 we clear it before enabling the * interrupts. Instances must be allocated before the BAT or * the host may time out. */ MCHP_GIRQ_SRC(config->girq_id) = BIT(config->girq_bit); dummy = base->TRX_BUFF; base->STATUS = MCHP_PS2_STATUS_RW1C_MASK; /* Enable FSM and init instance in rx mode*/ base->CTRL = MCHP_PS2_CTRL_EN_POS; /* We enable the interrupts in the EC aggregator so that the * result can be forwarded to the ARM NVIC */ MCHP_GIRQ_ENSET(config->girq_id) = BIT(config->girq_bit); k_sem_give(&data->tx_lock); return 0; } static int ps2_xec_write(const struct device *dev, uint8_t value) { const struct ps2_xec_config *config = dev->config; struct ps2_xec_data *data = dev->data; PS2_Type *base = config->base; int i = 0; uint8_t __attribute__((unused)) dummy; if (k_sem_take(&data->tx_lock, K_NO_WAIT)) { return -EACCES; } /* Allow the PS2 controller to complete a RX transaction. This * is because the channel may be actively receiving data. * In addition, it is necessary to wait for a previous TX * transaction to complete. The PS2 block has a single * FSM. */ while (((base->STATUS & (MCHP_PS2_STATUS_RX_BUSY | MCHP_PS2_STATUS_TX_IDLE)) != MCHP_PS2_STATUS_TX_IDLE) && (i < PS2_TIMEOUT)) { k_busy_wait(50); i++; } if (unlikely(i == PS2_TIMEOUT)) { LOG_DBG("PS2 write timed out"); return -ETIMEDOUT; } /* Inhibit ps2 controller and clear status register */ base->CTRL = 0x00; /* Read to clear data ready bit in the status register*/ dummy = base->TRX_BUFF; k_sleep(K_MSEC(1)); base->STATUS = MCHP_PS2_STATUS_RW1C_MASK; /* Switch the interface to TX mode and enable state machine */ base->CTRL = MCHP_PS2_CTRL_TR_TX | MCHP_PS2_CTRL_EN; /* Write value to TX/RX register */ base->TRX_BUFF = value; k_sem_give(&data->tx_lock); return 0; } static int ps2_xec_inhibit_interface(const struct device *dev) { const struct ps2_xec_config *config = dev->config; struct ps2_xec_data *data = dev->data; PS2_Type *base = config->base; if (k_sem_take(&data->tx_lock, K_MSEC(10)) != 0) { return -EACCES; } base->CTRL = 0x00; MCHP_GIRQ_SRC(config->girq_id) = BIT(config->girq_bit); NVIC_ClearPendingIRQ(config->isr_nvic); k_sem_give(&data->tx_lock); return 0; } static int ps2_xec_enable_interface(const struct device *dev) { const struct ps2_xec_config *config = dev->config; struct ps2_xec_data *data = dev->data; PS2_Type *base = config->base; MCHP_GIRQ_SRC(config->girq_id) = BIT(config->girq_bit); base->CTRL = MCHP_PS2_CTRL_EN; k_sem_give(&data->tx_lock); return 0; } static void ps2_xec_isr(const struct device *dev) { const struct ps2_xec_config *config = dev->config; struct ps2_xec_data *data = dev->data; PS2_Type *base = config->base; uint32_t status; MCHP_GIRQ_SRC(config->girq_id) = BIT(config->girq_bit); /* Read and clear status */ status = base->STATUS; if (status & MCHP_PS2_STATUS_RXD_RDY) { base->CTRL = 0x00; if (data->callback_isr) { data->callback_isr(dev, base->TRX_BUFF); } } else if (status & (MCHP_PS2_STATUS_TX_TMOUT | MCHP_PS2_STATUS_TX_ST_TMOUT)) { /* Clear sticky bits and go to read mode */ base->STATUS = MCHP_PS2_STATUS_RW1C_MASK; LOG_ERR("TX time out: %0x", status); } /* The control register reverts to RX automatically after * transmiting the data */ base->CTRL = MCHP_PS2_CTRL_EN; } static const struct ps2_driver_api ps2_xec_driver_api = { .config = ps2_xec_configure, .read = NULL, .write = ps2_xec_write, .disable_callback = ps2_xec_inhibit_interface, .enable_callback = ps2_xec_enable_interface, }; #ifdef CONFIG_PS2_XEC_0 static int ps2_xec_init_0(const struct device *dev); static const struct ps2_xec_config ps2_xec_config_0 = { .base = (PS2_Type *) DT_INST_REG_ADDR(0), .girq_id = DT_INST_PROP(0, girq), .girq_bit = DT_INST_PROP(0, girq_bit), .isr_nvic = DT_INST_IRQN(0), }; static struct ps2_xec_data ps2_xec_port_data_0; DEVICE_DT_INST_DEFINE(0, &ps2_xec_init_0, NULL, &ps2_xec_port_data_0, &ps2_xec_config_0, POST_KERNEL, CONFIG_PS2_INIT_PRIORITY, &ps2_xec_driver_api); static int ps2_xec_init_0(const struct device *dev) { ARG_UNUSED(dev); struct ps2_xec_data *data = dev->data; k_sem_init(&data->tx_lock, 0, 1); IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), ps2_xec_isr, DEVICE_DT_INST_GET(0), 0); irq_enable(DT_INST_IRQN(0)); return 0; } #endif /* CONFIG_PS2_XEC_0 */ #ifdef CONFIG_PS2_XEC_1 static int ps2_xec_init_1(const struct device *dev); static const struct ps2_xec_config ps2_xec_config_1 = { .base = (PS2_Type *) DT_INST_REG_ADDR(1), .girq_id = DT_INST_PROP(1, girq), .girq_bit = DT_INST_PROP(1, girq_bit), .isr_nvic = DT_INST_IRQN(1), }; static struct ps2_xec_data ps2_xec_port_data_1; DEVICE_DT_INST_DEFINE(1, &ps2_xec_init_1, NULL, &ps2_xec_port_data_1, &ps2_xec_config_1, POST_KERNEL, CONFIG_PS2_INIT_PRIORITY, &ps2_xec_driver_api); static int ps2_xec_init_1(const struct device *dev) { ARG_UNUSED(dev); struct ps2_xec_data *data = dev->data; k_sem_init(&data->tx_lock, 0, 1); IRQ_CONNECT(DT_INST_IRQN(1), DT_INST_IRQ(1, priority), ps2_xec_isr, DEVICE_DT_INST_GET(1), 0); irq_enable(DT_INST_IRQN(1)); return 0; } #endif /* CONFIG_PS2_XEC_1 */