1 /* uart_xlnx_ps.c - Xilinx Zynq family serial driver */
6  * SPDX-License-Identifier: Apache-2.0
19  * - the following macro for the number of bytes between register addresses:
42  * Comp. Xilinx Zynq-7000 Technical Reference Manual (ug585), chap. B.33
50 #define XUARTPS_IMR_OFFSET	0x0010U  /**< Interrupt Mask [12:0] */
61 #define XUARTPS_TXWM_OFFSET	0x0044U  /**< TX FIFO Trigger Level [5:0] */
68 #define XUARTPS_CR_TX_DIS	0x00000020U  /**< TX disabled. */
69 #define XUARTPS_CR_TX_EN	0x00000010U  /**< TX enabled */
72 #define XUARTPS_CR_EN_DIS_MASK	0x0000003CU  /**< Enable/disable Mask */
73 #define XUARTPS_CR_TXRST	0x00000002U  /**< TX logic reset */
83 #define XUARTPS_MR_CHMODE_MASK		0x00000300U /**< Mode mask */
88 #define XUARTPS_MR_STOPMODE_MASK	0x000000A0U /**< Stop bits mask */
95 #define XUARTPS_MR_PARITY_MASK		0x00000038U /**< Parity mask */
100 #define XUARTPS_MR_CHARLEN_MASK		0x00000006U /**< Data length mask */
105 #define XUARTPS_IXR_TOVR	0x00001000U /**< Tx FIFO Overflow interrupt */
106 #define XUARTPS_IXR_TNFUL	0x00000800U /**< Tx FIFO Nearly Full interrupt */
107 #define XUARTPS_IXR_TTRIG	0x00000400U /**< Tx Trig interrupt */
113 #define XUARTPS_IXR_TXFULL	0x00000010U /**< TX FIFO full interrupt. */
114 #define XUARTPS_IXR_TXEMPTY	0x00000008U /**< TX FIFO empty interrupt. */
118 #define XUARTPS_IXR_MASK	0x00003FFFU /**< Valid bit mask */
123 #define XUARTPS_MODEMCR_FCM_MASK	0x00000020 /**< Hardware flow control mask. */
128 #define XUARTPS_SR_TNFUL	0x00004000U /**< TX FIFO Nearly Full Status */
129 #define XUARTPS_SR_TTRIG	0x00002000U /**< TX FIFO Trigger Status */
131 #define XUARTPS_SR_TACTIVE	0x00000800U /**< TX active */
133 #define XUARTPS_SR_TXFULL	0x00000010U /**< TX FIFO full */
134 #define XUARTPS_SR_TXEMPTY	0x00000008U /**< TX FIFO empty */
167  * @brief Disables the UART's RX and TX function.
169  * Writes 'Disable RX' and 'Disable TX' command bits into the respective
176  * of the UART are modified at run-time.
191  * @brief Enables the UART's RX and TX function.
193  * Writes 'Enable RX' and 'Enable TX' command bits into the respective
200  * of the UART are being modified at run-time.
222  * registers is described in the Zynq-7000 TRM, chapter 19.2.3 'Baud Rate
230 	const struct uart_xlnx_ps_dev_config *dev_cfg = dev->config;  in set_baudrate()
231 	uint32_t baud = dev_cfg->baud_rate;  in set_baudrate()
232 	uint32_t clk_freq = dev_cfg->sys_clk_freq;  in set_baudrate()
253 				bauderr = baud - tmpbaud;  in set_baudrate()
255 				bauderr = tmpbaud - baud;  in set_baudrate()
264 		 * -> This function is always called from a context in which  in set_baudrate()
284 	const struct uart_xlnx_ps_dev_config *dev_cfg = dev->config;  in uart_xlnx_ps_init()
293 	/* Disable RX/TX before changing any configuration data */  in uart_xlnx_ps_init()
297 	err = pinctrl_apply_state(dev_cfg->pincfg, PINCTRL_STATE_DEFAULT);  in uart_xlnx_ps_init()
318 	set_baudrate(dev, dev_cfg->baud_rate);  in uart_xlnx_ps_init()
326 	dev_cfg->irq_config_func(dev);  in uart_xlnx_ps_init()
341  * @return 0 if a character arrived, -1 if the input buffer if empty.
352 		return -1;  in uart_xlnx_ps_poll_in()
388  * @brief Converts a parity enum value to a Mode Register bit mask.
392  * into a bit mask within the Mode Register.
400  * @param parity   Enumeration value to be converted to a bit mask.
443  * @brief Converts a stop bit enum value to a Mode Register bit mask.
447  * into a bit mask within the Mode Register.
455  * @param stopbits Enumeration value to be converted to a bit mask.
493  * @brief Converts a data bit enum value to a Mode Register bit mask.
497  * into a bit mask within the Mode Register.
505  * @param databits Enumeration value to be converted to a bit mask.
544  *        Register bit mask.
548  * setting into a bit mask within the Modem Control Register.
557  * @param hwctrl Enumeration value to be converted to a bit mask.
587  * @brief Configures the UART device at run-time.
589  * Configures the UART device at run-time according to the
602 	(struct uart_xlnx_ps_dev_config *)dev->config;  in uart_xlnx_ps_configure()
612 	/* Mask out all items that might be re-configured */  in uart_xlnx_ps_configure()
619 	if ((!uart_xlnx_ps_cfg2ll_parity(&mode_reg, cfg->parity)) ||  in uart_xlnx_ps_configure()
620 		(!uart_xlnx_ps_cfg2ll_stopbits(&mode_reg, cfg->stop_bits)) ||  in uart_xlnx_ps_configure()
621 		(!uart_xlnx_ps_cfg2ll_databits(&mode_reg, cfg->data_bits)) ||  in uart_xlnx_ps_configure()
622 		(!uart_xlnx_ps_cfg2ll_hwctrl(&modemcr_reg, cfg->flow_ctrl))) {  in uart_xlnx_ps_configure()
623 		return -ENOTSUP;  in uart_xlnx_ps_configure()
630 	set_baudrate(dev, cfg->baudrate);  in uart_xlnx_ps_configure()
631 	dev_cfg->baud_rate = cfg->baudrate;  in uart_xlnx_ps_configure()
637 	/* Re-enable the controller */  in uart_xlnx_ps_configure()
645  * @brief Converts a Mode Register bit mask to a parity configuration
648  * Converts a bit mask representing the UART's parity setting within
664 	 *  000b : even -> reset value  in uart_xlnx_ps_ll2cfg_parity()
687  * @brief Converts a Mode Register bit mask to a stop bit configuration
690  * Converts a bit mask representing the UART's stop bit setting within
706 	 *  00b : 1 stop bit -> reset value  in uart_xlnx_ps_ll2cfg_stopbits()
724  * @brief Converts a Mode Register bit mask to a data bit configuration
727  * Converts a bit mask representing the UART's data bit setting within
743 	 *  0xb : 8 data bits -> reset value  in uart_xlnx_ps_ll2cfg_databits()
760  * @brief Converts a Modem Control Register bit mask to a flow control
763  * Converts a bit mask representing the UART's flow control setting within
779 	 *  0b : no flow control -> reset value  in uart_xlnx_ps_ll2cfg_hwctrl()
793  * @brief Returns the current configuration of the UART at run-time.
795  * Returns the current configuration of the UART at run-time by obtaining
808 	const struct uart_xlnx_ps_dev_config *dev_cfg = dev->config;  in uart_xlnx_ps_config_get()
812 	 * Read the Mode & Modem control registers - they contain  in uart_xlnx_ps_config_get()
820 	cfg->baudrate  = dev_cfg->baud_rate;  in uart_xlnx_ps_config_get()
821 	cfg->parity    = uart_xlnx_ps_ll2cfg_parity(mode_reg);  in uart_xlnx_ps_config_get()
822 	cfg->stop_bits = uart_xlnx_ps_ll2cfg_stopbits(mode_reg);  in uart_xlnx_ps_config_get()
823 	cfg->data_bits = uart_xlnx_ps_ll2cfg_databits(mode_reg);  in uart_xlnx_ps_config_get()
824 	cfg->flow_ctrl = uart_xlnx_ps_ll2cfg_hwctrl(modemcr_reg);  in uart_xlnx_ps_config_get()
849 	while (size--) {  in uart_xlnx_ps_fifo_fill()
886  * @brief Enable TX interrupt in IER
900  * @brief Disable TX interrupt in IER
914  * @brief Check if Tx IRQ has been raised
1076 	struct uart_xlnx_ps_dev_data_t *dev_data = dev->data;  in uart_xlnx_ps_irq_callback_set()
1078 	dev_data->user_cb = cb;  in uart_xlnx_ps_irq_callback_set()
1079 	dev_data->user_data = cb_data;  in uart_xlnx_ps_irq_callback_set()
1091 	const struct uart_xlnx_ps_dev_data_t *data = dev->data;  in uart_xlnx_ps_isr()
1093 	if (data->user_cb) {  in uart_xlnx_ps_isr()
1094 		data->user_cb(dev, data->user_data);  in uart_xlnx_ps_isr()