/* * Copyright (c) 2018 Linaro Limited * Copyright (c) 2022 Arm Limited (or its affiliates). All rights reserved. * Copyright (c) 2023 Antmicro * * SPDX-License-Identifier: Apache-2.0 */ #define DT_DRV_COMPAT arm_pl011 #define SBSA_COMPAT arm_sbsa_uart #include #include #include #include #include #include #include #include #include #if defined(CONFIG_PINCTRL) #include #endif #if defined(CONFIG_RESET) #include #endif #if defined(CONFIG_CLOCK_CONTROL) #include #endif #ifdef CONFIG_CPU_CORTEX_M #include #endif #include "uart_pl011_registers.h" #include "uart_pl011_ambiq.h" #include "uart_pl011_raspberrypi_pico.h" struct pl011_config { DEVICE_MMIO_ROM; #if defined(CONFIG_PINCTRL) const struct pinctrl_dev_config *pincfg; #endif #if defined(CONFIG_RESET) const struct reset_dt_spec reset; #endif #if defined(CONFIG_CLOCK_CONTROL) const struct device *clock_dev; clock_control_subsys_t clock_id; #endif #ifdef CONFIG_UART_INTERRUPT_DRIVEN uart_irq_config_func_t irq_config_func; #endif int (*clk_enable_func)(const struct device *dev, uint32_t clk); int (*pwr_on_func)(void); }; /* Device data structure */ struct pl011_data { DEVICE_MMIO_RAM; struct uart_config uart_cfg; bool sbsa; /* SBSA mode */ uint32_t clk_freq; #ifdef CONFIG_UART_INTERRUPT_DRIVEN volatile bool sw_call_txdrdy; uart_irq_callback_user_data_t irq_cb; void *irq_cb_data; #endif }; static void pl011_enable(const struct device *dev) { get_uart(dev)->cr |= PL011_CR_UARTEN; } static void pl011_disable(const struct device *dev) { get_uart(dev)->cr &= ~PL011_CR_UARTEN; } static void pl011_enable_fifo(const struct device *dev) { get_uart(dev)->lcr_h |= PL011_LCRH_FEN; } static void pl011_disable_fifo(const struct device *dev) { get_uart(dev)->lcr_h &= ~PL011_LCRH_FEN; } static void pl011_set_flow_control(const struct device *dev, bool rts, bool cts) { if (rts) { get_uart(dev)->cr |= PL011_CR_RTSEn; } else { get_uart(dev)->cr &= ~PL011_CR_RTSEn; } if (cts) { get_uart(dev)->cr |= PL011_CR_CTSEn; } else { get_uart(dev)->cr &= ~PL011_CR_CTSEn; } } static int pl011_set_baudrate(const struct device *dev, uint32_t clk, uint32_t baudrate) { /* Avoiding float calculations, bauddiv is left shifted by 6 */ uint64_t bauddiv = (((uint64_t)clk) << PL011_FBRD_WIDTH) / (baudrate * 16U); /* Valid bauddiv value * uart_clk (min) >= 16 x baud_rate (max) * uart_clk (max) <= 16 x 65535 x baud_rate (min) */ if ((bauddiv < (1u << PL011_FBRD_WIDTH)) || (bauddiv > (65535u << PL011_FBRD_WIDTH))) { return -EINVAL; } get_uart(dev)->ibrd = bauddiv >> PL011_FBRD_WIDTH; get_uart(dev)->fbrd = bauddiv & ((1u << PL011_FBRD_WIDTH) - 1u); barrier_dmem_fence_full(); /* In order to internally update the contents of ibrd or fbrd, a * lcr_h write must always be performed at the end * ARM DDI 0183F, Pg 3-13 */ get_uart(dev)->lcr_h = get_uart(dev)->lcr_h; return 0; } static bool pl011_is_readable(const struct device *dev) { struct pl011_data *data = dev->data; if (!data->sbsa && (!(get_uart(dev)->cr & PL011_CR_UARTEN) || !(get_uart(dev)->cr & PL011_CR_RXE))) { return false; } return (get_uart(dev)->fr & PL011_FR_RXFE) == 0U; } static int pl011_poll_in(const struct device *dev, unsigned char *c) { if (!pl011_is_readable(dev)) { return -1; } /* got a character */ *c = (unsigned char)get_uart(dev)->dr; return get_uart(dev)->rsr & PL011_RSR_ERROR_MASK; } static void pl011_poll_out(const struct device *dev, unsigned char c) { /* Wait for space in FIFO */ while (get_uart(dev)->fr & PL011_FR_TXFF) { ; /* Wait */ } /* Send a character */ get_uart(dev)->dr = (uint32_t)c; } static int pl011_err_check(const struct device *dev) { int errors = 0; if (get_uart(dev)->rsr & PL011_RSR_ECR_OE) { errors |= UART_ERROR_OVERRUN; } if (get_uart(dev)->rsr & PL011_RSR_ECR_BE) { errors |= UART_BREAK; } if (get_uart(dev)->rsr & PL011_RSR_ECR_PE) { errors |= UART_ERROR_PARITY; } if (get_uart(dev)->rsr & PL011_RSR_ECR_FE) { errors |= UART_ERROR_FRAMING; } return errors; } static int pl011_runtime_configure_internal(const struct device *dev, const struct uart_config *cfg, bool disable) { struct pl011_data *data = dev->data; uint32_t lcrh; int ret = -ENOTSUP; if (data->sbsa) { goto out; } if (disable) { pl011_disable(dev); pl011_disable_fifo(dev); } lcrh = get_uart(dev)->lcr_h & ~(PL011_LCRH_FORMAT_MASK | PL011_LCRH_STP2); switch (cfg->parity) { case UART_CFG_PARITY_NONE: lcrh &= ~(BIT(1) | BIT(2)); break; case UART_CFG_PARITY_ODD: lcrh |= PL011_LCRH_PARITY_ODD; break; case UART_CFG_PARITY_EVEN: lcrh |= PL011_LCRH_PARTIY_EVEN; break; default: goto enable; } switch (cfg->stop_bits) { case UART_CFG_STOP_BITS_1: lcrh &= ~(PL011_LCRH_STP2); break; case UART_CFG_STOP_BITS_2: lcrh |= PL011_LCRH_STP2; break; default: goto enable; } switch (cfg->data_bits) { case UART_CFG_DATA_BITS_5: lcrh |= PL011_LCRH_WLEN_SIZE(5) << PL011_LCRH_WLEN_SHIFT; break; case UART_CFG_DATA_BITS_6: lcrh |= PL011_LCRH_WLEN_SIZE(6) << PL011_LCRH_WLEN_SHIFT; break; case UART_CFG_DATA_BITS_7: lcrh |= PL011_LCRH_WLEN_SIZE(7) << PL011_LCRH_WLEN_SHIFT; break; case UART_CFG_DATA_BITS_8: lcrh |= PL011_LCRH_WLEN_SIZE(8) << PL011_LCRH_WLEN_SHIFT; break; default: goto enable; } switch (cfg->flow_ctrl) { case UART_CFG_FLOW_CTRL_NONE: pl011_set_flow_control(dev, false, false); break; case UART_CFG_FLOW_CTRL_RTS_CTS: pl011_set_flow_control(dev, true, true); break; default: goto enable; } /* Set baud rate */ ret = pl011_set_baudrate(dev, data->clk_freq, cfg->baudrate); if (ret != 0) { goto enable; } /* Update settings */ get_uart(dev)->lcr_h = lcrh; memcpy(&data->uart_cfg, cfg, sizeof(data->uart_cfg)); enable: if (disable) { pl011_enable_fifo(dev); pl011_enable(dev); } out: return ret; } #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE static int pl011_runtime_configure(const struct device *dev, const struct uart_config *cfg) { return pl011_runtime_configure_internal(dev, cfg, true); } static int pl011_runtime_config_get(const struct device *dev, struct uart_config *cfg) { struct pl011_data *data = dev->data; *cfg = data->uart_cfg; return 0; } #endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */ #ifdef CONFIG_UART_INTERRUPT_DRIVEN static int pl011_fifo_fill(const struct device *dev, const uint8_t *tx_data, int len) { uint8_t num_tx = 0U; while (!(get_uart(dev)->fr & PL011_FR_TXFF) && (len - num_tx > 0)) { get_uart(dev)->dr = tx_data[num_tx++]; } return num_tx; } static int pl011_fifo_read(const struct device *dev, uint8_t *rx_data, const int len) { uint8_t num_rx = 0U; while ((len - num_rx > 0) && !(get_uart(dev)->fr & PL011_FR_RXFE)) { rx_data[num_rx++] = get_uart(dev)->dr; } return num_rx; } static void pl011_irq_tx_enable(const struct device *dev) { struct pl011_data *data = dev->data; get_uart(dev)->imsc |= PL011_IMSC_TXIM; if (data->sw_call_txdrdy) { /* Verify if the callback has been registered */ if (data->irq_cb) { /* * Due to HW limitation, the first TX interrupt should * be triggered by the software. * * PL011 TX interrupt is based on a transition through * a level, rather than on the level itself[1]. So that, * enable TX interrupt can not trigger TX interrupt if * no data was filled to TX FIFO at the beginning. * * [1]: PrimeCell UART (PL011) Technical Reference Manual * functional-overview/interrupts */ data->irq_cb(dev, data->irq_cb_data); } data->sw_call_txdrdy = false; } } static void pl011_irq_tx_disable(const struct device *dev) { get_uart(dev)->imsc &= ~PL011_IMSC_TXIM; } static int pl011_irq_tx_complete(const struct device *dev) { /* Check for UART is busy transmitting data. */ return ((get_uart(dev)->fr & PL011_FR_BUSY) == 0); } static int pl011_irq_tx_ready(const struct device *dev) { struct pl011_data *data = dev->data; if (!data->sbsa && !(get_uart(dev)->cr & PL011_CR_TXE)) return false; return ((get_uart(dev)->imsc & PL011_IMSC_TXIM) && /* Check for TX interrupt status is set or TX FIFO is empty. */ (get_uart(dev)->ris & PL011_RIS_TXRIS || get_uart(dev)->fr & PL011_FR_TXFE)); } static void pl011_irq_rx_enable(const struct device *dev) { get_uart(dev)->imsc |= PL011_IMSC_RXIM | PL011_IMSC_RTIM; } static void pl011_irq_rx_disable(const struct device *dev) { get_uart(dev)->imsc &= ~(PL011_IMSC_RXIM | PL011_IMSC_RTIM); } static int pl011_irq_rx_ready(const struct device *dev) { struct pl011_data *data = dev->data; if (!data->sbsa && !(get_uart(dev)->cr & PL011_CR_RXE)) return false; return ((get_uart(dev)->imsc & PL011_IMSC_RXIM) && (!(get_uart(dev)->fr & PL011_FR_RXFE))); } static void pl011_irq_err_enable(const struct device *dev) { /* enable framing, parity, break, and overrun */ get_uart(dev)->imsc |= PL011_IMSC_ERROR_MASK; } static void pl011_irq_err_disable(const struct device *dev) { get_uart(dev)->imsc &= ~PL011_IMSC_ERROR_MASK; } static int pl011_irq_is_pending(const struct device *dev) { return pl011_irq_rx_ready(dev) || pl011_irq_tx_ready(dev); } static int pl011_irq_update(const struct device *dev) { return 1; } static void pl011_irq_callback_set(const struct device *dev, uart_irq_callback_user_data_t cb, void *cb_data) { struct pl011_data *data = dev->data; data->irq_cb = cb; data->irq_cb_data = cb_data; } #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ static const struct uart_driver_api pl011_driver_api = { .poll_in = pl011_poll_in, .poll_out = pl011_poll_out, .err_check = pl011_err_check, #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE .configure = pl011_runtime_configure, .config_get = pl011_runtime_config_get, #endif #ifdef CONFIG_UART_INTERRUPT_DRIVEN .fifo_fill = pl011_fifo_fill, .fifo_read = pl011_fifo_read, .irq_tx_enable = pl011_irq_tx_enable, .irq_tx_disable = pl011_irq_tx_disable, .irq_tx_ready = pl011_irq_tx_ready, .irq_rx_enable = pl011_irq_rx_enable, .irq_rx_disable = pl011_irq_rx_disable, .irq_tx_complete = pl011_irq_tx_complete, .irq_rx_ready = pl011_irq_rx_ready, .irq_err_enable = pl011_irq_err_enable, .irq_err_disable = pl011_irq_err_disable, .irq_is_pending = pl011_irq_is_pending, .irq_update = pl011_irq_update, .irq_callback_set = pl011_irq_callback_set, #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ }; static int pl011_init(const struct device *dev) { const struct pl011_config *config = dev->config; struct pl011_data *data = dev->data; int ret; DEVICE_MMIO_MAP(dev, K_MEM_CACHE_NONE); #if defined(CONFIG_RESET) if (config->reset.dev) { ret = reset_line_toggle_dt(&config->reset); if (ret) { return ret; } } #endif #if defined(CONFIG_CLOCK_CONTROL) if (config->clock_dev) { clock_control_on(config->clock_dev, config->clock_id); clock_control_get_rate(config->clock_dev, config->clock_id, &data->clk_freq); } #endif /* * If working in SBSA mode, we assume that UART is already configured, * or does not require configuration at all (if UART is emulated by * virtualization software). */ if (!data->sbsa) { #if defined(CONFIG_PINCTRL) ret = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT); if (ret) { return ret; } #endif /* Call vendor-specific function to power on the peripheral */ if (config->pwr_on_func != NULL) { ret = config->pwr_on_func(); } /* disable the uart */ pl011_disable(dev); pl011_disable_fifo(dev); /* Call vendor-specific function to enable clock for the peripheral */ if (config->clk_enable_func != NULL) { ret = config->clk_enable_func(dev, data->clk_freq); if (ret) { return ret; } } pl011_runtime_configure_internal(dev, &data->uart_cfg, false); /* Setting transmit and receive interrupt FIFO level */ get_uart(dev)->ifls = FIELD_PREP(PL011_IFLS_TXIFLSEL_M, TXIFLSEL_1_8_FULL) | FIELD_PREP(PL011_IFLS_RXIFLSEL_M, RXIFLSEL_1_2_FULL); /* Enabling the FIFOs */ pl011_enable_fifo(dev); } /* initialize all IRQs as masked */ get_uart(dev)->imsc = 0U; get_uart(dev)->icr = PL011_IMSC_MASK_ALL; if (!data->sbsa) { get_uart(dev)->dmacr = 0U; barrier_isync_fence_full(); get_uart(dev)->cr &= ~PL011_CR_SIREN; get_uart(dev)->cr |= PL011_CR_RXE | PL011_CR_TXE; barrier_isync_fence_full(); } #ifdef CONFIG_UART_INTERRUPT_DRIVEN config->irq_config_func(dev); data->sw_call_txdrdy = true; #endif if (!data->sbsa) { pl011_enable(dev); } return 0; } #define COMPAT_SPECIFIC_FUNC_NAME(prefix, name) _CONCAT(_CONCAT(prefix, name), _) /* * The first element of compatible is used to determine the type. * When compatible defines as "ambiq,uart", "arm,pl011", * this macro expands to pwr_on_ambiq_uart_[n]. */ #define COMPAT_SPECIFIC_PWR_ON_FUNC(n) \ _CONCAT(COMPAT_SPECIFIC_FUNC_NAME(pwr_on_, DT_INST_STRING_TOKEN_BY_IDX(n, compatible, 0)), \ n) /* * The first element of compatible is used to determine the type. * When compatible defines as "ambiq,uart", "arm,pl011", * this macro expands to clk_enable_ambiq_uart_[n]. */ #define COMPAT_SPECIFIC_CLK_ENABLE_FUNC(n) \ _CONCAT(COMPAT_SPECIFIC_FUNC_NAME(clk_enable_, \ DT_INST_STRING_TOKEN_BY_IDX(n, compatible, 0)), n) /* * The first element of compatible is used to determine the type. * When compatible defines as "ambiq,uart", "arm,pl011", * this macro expands to AMBIQ_UART_DEFINE(n). */ #define COMPAT_SPECIFIC_DEFINE(n) \ _CONCAT(DT_INST_STRING_UPPER_TOKEN_BY_IDX(n, compatible, 0), _DEFINE)(n) #define COMPAT_SPECIFIC_CLOCK_CTLR_SUBSYS_CELL(n) \ _CONCAT(DT_INST_STRING_UPPER_TOKEN_BY_IDX(n, compatible, 0), _CLOCK_CTLR_SUBSYS_CELL) #if defined(CONFIG_PINCTRL) #define PINCTRL_DEFINE(n) PINCTRL_DT_INST_DEFINE(n); #define PINCTRL_INIT(n) .pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), #else #define PINCTRL_DEFINE(n) #define PINCTRL_INIT(n) #endif /* CONFIG_PINCTRL */ #if defined(CONFIG_RESET) #define RESET_INIT(n) \ IF_ENABLED(DT_INST_NODE_HAS_PROP(0, resets), (.reset = RESET_DT_SPEC_INST_GET(n),)) #else #define RESET_INIT(n) #endif #define CLOCK_INIT(n) \ COND_CODE_1(DT_NODE_HAS_COMPAT(DT_INST_CLOCKS_CTLR(n), fixed_clock), (), \ (.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)), \ .clock_id = (clock_control_subsys_t)DT_INST_CLOCKS_CELL(n, \ COMPAT_SPECIFIC_CLOCK_CTLR_SUBSYS_CELL(n)),)) #define ARM_PL011_DEFINE(n) \ static inline int pwr_on_arm_pl011_##n(void) \ { \ return 0; \ } \ static inline int clk_enable_arm_pl011_##n(const struct device *dev, uint32_t clk) \ { \ return 0; \ } #ifdef CONFIG_UART_INTERRUPT_DRIVEN void pl011_isr(const struct device *dev) { struct pl011_data *data = dev->data; /* Verify if the callback has been registered */ if (data->irq_cb) { data->irq_cb(dev, data->irq_cb_data); } } #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ #ifdef CONFIG_UART_INTERRUPT_DRIVEN #define PL011_IRQ_CONFIG_FUNC_BODY(n, prop, i) \ { \ IRQ_CONNECT(DT_IRQ_BY_IDX(n, i, irq), \ DT_IRQ_BY_IDX(n, i, priority), \ pl011_isr, \ DEVICE_DT_GET(n), \ 0); \ irq_enable(DT_IRQ_BY_IDX(n, i, irq)); \ } #define PL011_CONFIG_PORT(n) \ static void pl011_irq_config_func_##n(const struct device *dev) \ { \ DT_INST_FOREACH_PROP_ELEM(n, interrupt_names, \ PL011_IRQ_CONFIG_FUNC_BODY) \ }; \ \ static struct pl011_config pl011_cfg_port_##n = { \ DEVICE_MMIO_ROM_INIT(DT_DRV_INST(n)), \ CLOCK_INIT(n) \ PINCTRL_INIT(n) \ .irq_config_func = pl011_irq_config_func_##n, \ .clk_enable_func = COMPAT_SPECIFIC_CLK_ENABLE_FUNC(n), \ .pwr_on_func = COMPAT_SPECIFIC_PWR_ON_FUNC(n), \ }; #else #define PL011_CONFIG_PORT(n) \ static struct pl011_config pl011_cfg_port_##n = { \ DEVICE_MMIO_ROM_INIT(DT_DRV_INST(n)), \ CLOCK_INIT(n) \ PINCTRL_INIT(n) \ }; #endif /* CONFIG_UART_INTERRUPT_DRIVEN */ #define PL011_INIT(n) \ PINCTRL_DEFINE(n) \ COMPAT_SPECIFIC_DEFINE(n) \ PL011_CONFIG_PORT(n) \ \ static struct pl011_data pl011_data_port_##n = { \ .uart_cfg = { \ .baudrate = DT_INST_PROP(n, current_speed), \ .parity = UART_CFG_PARITY_NONE, \ .stop_bits = UART_CFG_STOP_BITS_1, \ .data_bits = UART_CFG_DATA_BITS_8, \ .flow_ctrl = DT_INST_PROP(n, hw_flow_control) \ ? UART_CFG_FLOW_CTRL_RTS_CTS \ : UART_CFG_FLOW_CTRL_NONE, \ }, \ .clk_freq = COND_CODE_1( \ DT_NODE_HAS_COMPAT(DT_INST_CLOCKS_CTLR(n), fixed_clock), \ (DT_INST_PROP_BY_PHANDLE(n, clocks, clock_frequency)), (0)), \ }; \ \ DEVICE_DT_INST_DEFINE(n, pl011_init, \ NULL, \ &pl011_data_port_##n, \ &pl011_cfg_port_##n, \ PRE_KERNEL_1, \ CONFIG_SERIAL_INIT_PRIORITY, \ &pl011_driver_api); DT_INST_FOREACH_STATUS_OKAY(PL011_INIT) #ifdef CONFIG_UART_PL011_SBSA #undef DT_DRV_COMPAT #define DT_DRV_COMPAT SBSA_COMPAT #ifdef CONFIG_UART_INTERRUPT_DRIVEN #define PL011_SBSA_CONFIG_PORT(n) \ static void pl011_irq_config_func_sbsa_##n(const struct device *dev) \ { \ DT_INST_FOREACH_PROP_ELEM(n, interrupt_names, \ PL011_IRQ_CONFIG_FUNC_BODY) \ }; \ \ static struct pl011_config pl011_cfg_sbsa_##n = { \ DEVICE_MMIO_ROM_INIT(DT_DRV_INST(n)), \ .irq_config_func = pl011_irq_config_func_sbsa_##n, \ }; #else #define PL011_SBSA_CONFIG_PORT(n) \ static struct pl011_config pl011_cfg_sbsa_##n = { \ DEVICE_MMIO_ROM_INIT(DT_DRV_INST(n)), \ }; #endif #define PL011_SBSA_INIT(n) \ PL011_SBSA_CONFIG_PORT(n) \ \ static struct pl011_data pl011_data_sbsa_##n = { \ .sbsa = true, \ }; \ \ DEVICE_DT_INST_DEFINE(n, pl011_init, \ NULL, \ &pl011_data_sbsa_##n, \ &pl011_cfg_sbsa_##n, \ PRE_KERNEL_1, \ CONFIG_SERIAL_INIT_PRIORITY, \ &pl011_driver_api); DT_INST_FOREACH_STATUS_OKAY(PL011_SBSA_INIT) #endif /* CONFIG_UART_PL011_SBSA */