/* * Copyright (c) 2010-2012, 2014, 2016, 2019, The Linux Foundation. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of The Linux Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #define UART_DM_CLK_RX_TX_BIT_RATE 0xFF enum MSM_BOOT_UART_DM_PARITY_MODE { MSM_BOOT_UART_DM_NO_PARITY, MSM_BOOT_UART_DM_ODD_PARITY, MSM_BOOT_UART_DM_EVEN_PARITY, MSM_BOOT_UART_DM_SPACE_PARITY }; /* UART Stop Bit Length */ enum MSM_BOOT_UART_DM_STOP_BIT_LEN { MSM_BOOT_UART_DM_SBL_9_16, MSM_BOOT_UART_DM_SBL_1, MSM_BOOT_UART_DM_SBL_1_9_16, MSM_BOOT_UART_DM_SBL_2 }; /* UART Bits per Char */ enum MSM_BOOT_UART_DM_BITS_PER_CHAR { MSM_BOOT_UART_DM_5_BPS, MSM_BOOT_UART_DM_6_BPS, MSM_BOOT_UART_DM_7_BPS, MSM_BOOT_UART_DM_8_BPS }; /* 8-N-1 Configuration */ #define MSM_BOOT_UART_DM_8_N_1_MODE (MSM_BOOT_UART_DM_NO_PARITY | \ (MSM_BOOT_UART_DM_SBL_1 << 2) | \ (MSM_BOOT_UART_DM_8_BPS << 4)) /* UART_DM Registers */ /* UART Operational Mode Register */ #define MSM_BOOT_UART_DM_MR1(base) ((base) + 0x00) #define MSM_BOOT_UART_DM_MR2(base) ((base) + 0x04) #define MSM_BOOT_UART_DM_RXBRK_ZERO_CHAR_OFF (1 << 8) #define MSM_BOOT_UART_DM_LOOPBACK (1 << 7) #define PERIPH_BLK_BLSP 1 /* UART Clock Selection Register */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_CSR(base) ((base) + 0xA0) #else #define MSM_BOOT_UART_DM_CSR(base) ((base) + 0x08) #endif /* UART DM TX FIFO Registers - 4 */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_TF(base, x) ((base) + 0x100+(4*(x))) #else #define MSM_BOOT_UART_DM_TF(base, x) ((base) + 0x70+(4*(x))) #endif /* UART Command Register */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_CR(base) ((base) + 0xA8) #else #define MSM_BOOT_UART_DM_CR(base) ((base) + 0x10) #endif #define MSM_BOOT_UART_DM_CR_RX_ENABLE (1 << 0) #define MSM_BOOT_UART_DM_CR_RX_DISABLE (1 << 1) #define MSM_BOOT_UART_DM_CR_TX_ENABLE (1 << 2) #define MSM_BOOT_UART_DM_CR_TX_DISABLE (1 << 3) /* UART Channel Command */ #define MSM_BOOT_UART_DM_CR_CH_CMD_LSB(x) ((x & 0x0f) << 4) #define MSM_BOOT_UART_DM_CR_CH_CMD_MSB(x) ((x >> 4) << 11) #define MSM_BOOT_UART_DM_CR_CH_CMD(x) \ (MSM_BOOT_UART_DM_CR_CH_CMD_LSB(x) | MSM_BOOT_UART_DM_CR_CH_CMD_MSB(x)) #define MSM_BOOT_UART_DM_CMD_NULL MSM_BOOT_UART_DM_CR_CH_CMD(0) #define MSM_BOOT_UART_DM_CMD_RESET_RX MSM_BOOT_UART_DM_CR_CH_CMD(1) #define MSM_BOOT_UART_DM_CMD_RESET_TX MSM_BOOT_UART_DM_CR_CH_CMD(2) #define MSM_BOOT_UART_DM_CMD_RESET_ERR_STAT MSM_BOOT_UART_DM_CR_CH_CMD(3) #define MSM_BOOT_UART_DM_CMD_RES_BRK_CHG_INT MSM_BOOT_UART_DM_CR_CH_CMD(4) #define MSM_BOOT_UART_DM_CMD_START_BRK MSM_BOOT_UART_DM_CR_CH_CMD(5) #define MSM_BOOT_UART_DM_CMD_STOP_BRK MSM_BOOT_UART_DM_CR_CH_CMD(6) #define MSM_BOOT_UART_DM_CMD_RES_CTS_N MSM_BOOT_UART_DM_CR_CH_CMD(7) #define MSM_BOOT_UART_DM_CMD_RES_STALE_INT MSM_BOOT_UART_DM_CR_CH_CMD(8) #define MSM_BOOT_UART_DM_CMD_PACKET_MODE MSM_BOOT_UART_DM_CR_CH_CMD(9) #define MSM_BOOT_UART_DM_CMD_MODE_RESET MSM_BOOT_UART_DM_CR_CH_CMD(C) #define MSM_BOOT_UART_DM_CMD_SET_RFR_N MSM_BOOT_UART_DM_CR_CH_CMD(D) #define MSM_BOOT_UART_DM_CMD_RES_RFR_N MSM_BOOT_UART_DM_CR_CH_CMD(E) #define MSM_BOOT_UART_DM_CMD_RES_TX_ERR MSM_BOOT_UART_DM_CR_CH_CMD(10) #define MSM_BOOT_UART_DM_CMD_CLR_TX_DONE MSM_BOOT_UART_DM_CR_CH_CMD(11) #define MSM_BOOT_UART_DM_CMD_RES_BRKSTRT_INT MSM_BOOT_UART_DM_CR_CH_CMD(12) #define MSM_BOOT_UART_DM_CMD_RES_BRKEND_INT MSM_BOOT_UART_DM_CR_CH_CMD(13) #define MSM_BOOT_UART_DM_CMD_RES_PER_FRM_INT MSM_BOOT_UART_DM_CR_CH_CMD(14) /*UART General Command */ #define MSM_UART_DM_CR_GENERAL_CMD(x) ((x) << 8) #define MSM_BOOT_UART_DM_GCMD_NULL MSM_UART_DM_CR_GENERAL_CMD(0) #define MSM_BOOT_UART_DM_GCMD_CR_PROT_EN MSM_UART_DM_CR_GENERAL_CMD(1) #define MSM_BOOT_UART_DM_GCMD_CR_PROT_DIS MSM_UART_DM_CR_GENERAL_CMD(2) #define MSM_BOOT_UART_DM_GCMD_RES_TX_RDY_INT MSM_UART_DM_CR_GENERAL_CMD(3) #define MSM_BOOT_UART_DM_GCMD_SW_FORCE_STALE MSM_UART_DM_CR_GENERAL_CMD(4) #define MSM_BOOT_UART_DM_GCMD_ENA_STALE_EVT MSM_UART_DM_CR_GENERAL_CMD(5) #define MSM_BOOT_UART_DM_GCMD_DIS_STALE_EVT MSM_UART_DM_CR_GENERAL_CMD(6) /* UART Interrupt Mask Register */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_IMR(base) ((base) + 0xB0) #else #define MSM_BOOT_UART_DM_IMR(base) ((base) + 0x14) #endif #define MSM_BOOT_UART_DM_TXLEV (1 << 0) #define MSM_BOOT_UART_DM_RXHUNT (1 << 1) #define MSM_BOOT_UART_DM_RXBRK_CHNG (1 << 2) #define MSM_BOOT_UART_DM_RXSTALE (1 << 3) #define MSM_BOOT_UART_DM_RXLEV (1 << 4) #define MSM_BOOT_UART_DM_DELTA_CTS (1 << 5) #define MSM_BOOT_UART_DM_CURRENT_CTS (1 << 6) #define MSM_BOOT_UART_DM_TX_READY (1 << 7) #define MSM_BOOT_UART_DM_TX_ERROR (1 << 8) #define MSM_BOOT_UART_DM_TX_DONE (1 << 9) #define MSM_BOOT_UART_DM_RXBREAK_START (1 << 10) #define MSM_BOOT_UART_DM_RXBREAK_END (1 << 11) #define MSM_BOOT_UART_DM_PAR_FRAME_ERR_IRQ (1 << 12) #define MSM_BOOT_UART_DM_IMR_ENABLED (MSM_BOOT_UART_DM_TX_READY | \ MSM_BOOT_UART_DM_TXLEV | \ MSM_BOOT_UART_DM_RXSTALE) /* UART Interrupt Programming Register */ #define MSM_BOOT_UART_DM_IPR(base) ((base) + 0x18) #define MSM_BOOT_UART_DM_STALE_TIMEOUT_LSB 0x0f #define MSM_BOOT_UART_DM_STALE_TIMEOUT_MSB 0 /* Not used currently */ /* UART Transmit/Receive FIFO Watermark Register */ #define MSM_BOOT_UART_DM_TFWR(base) ((base) + 0x1C) /* Interrupt is generated when FIFO level is less than or equal to this value */ #define MSM_BOOT_UART_DM_TFW_VALUE 0 #define MSM_BOOT_UART_DM_RFWR(base) ((base) + 0x20) /*Interrupt generated when no of words in RX FIFO is greater than this value */ #define MSM_BOOT_UART_DM_RFW_VALUE 0 /* UART Hunt Character Register */ #define MSM_BOOT_UART_DM_HCR(base) ((base) + 0x24) /* Used for RX transfer initialization */ #define MSM_BOOT_UART_DM_DMRX(base) ((base) + 0x34) /* Default DMRX value - any value bigger than FIFO size would be fine */ #define MSM_BOOT_UART_DM_DMRX_DEF_VALUE 0x220 /* Register to enable IRDA function */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_IRDA(base) ((base) + 0xB8) #else #define MSM_BOOT_UART_DM_IRDA(base) ((base) + 0x38) #endif /* UART Data Mover Enable Register */ #define MSM_BOOT_UART_DM_DMEN(base) ((base) + 0x3C) /* Number of characters for Transmission */ #define MSM_BOOT_UART_DM_NO_CHARS_FOR_TX(base) ((base) + 0x040) /* UART RX FIFO Base Address */ #define MSM_BOOT_UART_DM_BADR(base) ((base) + 0x44) /* UART Status Register */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_SR(base) ((base) + 0x0A4) #else #define MSM_BOOT_UART_DM_SR(base) ((base) + 0x008) #endif #define MSM_BOOT_UART_DM_SR_RXRDY (1 << 0) #define MSM_BOOT_UART_DM_SR_RXFULL (1 << 1) #define MSM_BOOT_UART_DM_SR_TXRDY (1 << 2) #define MSM_BOOT_UART_DM_SR_TXEMT (1 << 3) #define MSM_BOOT_UART_DM_SR_UART_OVERRUN (1 << 4) #define MSM_BOOT_UART_DM_SR_PAR_FRAME_ERR (1 << 5) #define MSM_BOOT_UART_DM_RX_BREAK (1 << 6) #define MSM_BOOT_UART_DM_HUNT_CHAR (1 << 7) #define MSM_BOOT_UART_DM_RX_BRK_START_LAST (1 << 8) /* UART Receive FIFO Registers - 4 in numbers */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_RF(base, x) ((base) + 0x140 + (4*(x))) #else #define MSM_BOOT_UART_DM_RF(base, x) ((base) + 0x70 + (4*(x))) #endif /* UART Masked Interrupt Status Register */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_MISR(base) ((base) + 0xAC) #else #define MSM_BOOT_UART_DM_MISR(base) ((base) + 0x10) #endif /* UART Interrupt Status Register */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_ISR(base) ((base) + 0xB4) #else #define MSM_BOOT_UART_DM_ISR(base) ((base) + 0x14) #endif /* Number of characters received since the end of last RX transfer */ #if PERIPH_BLK_BLSP #define MSM_BOOT_UART_DM_RX_TOTAL_SNAP(base) ((base) + 0xBC) #else #define MSM_BOOT_UART_DM_RX_TOTAL_SNAP(base) ((base) + 0x38) #endif /* UART TX FIFO Status Register */ #define MSM_BOOT_UART_DM_TXFS(base) ((base) + 0x4C) #define MSM_BOOT_UART_DM_TXFS_STATE_LSB(x) \ MSM_BOOT_UART_DM_EXTR_BITS(x, 0, 6) #define MSM_BOOT_UART_DM_TXFS_STATE_MSB(x) \ MSM_BOOT_UART_DM_EXTR_BITS(x, 14, 31) #define MSM_BOOT_UART_DM_TXFS_BUF_STATE(x) \ MSM_BOOT_UART_DM_EXTR_BITS(x, 7, 9) #define MSM_BOOT_UART_DM_TXFS_ASYNC_STATE(x) \ MSM_BOOT_UART_DM_EXTR_BITS(x, 10, 13) /* UART RX FIFO Status Register */ #define MSM_BOOT_UART_DM_RXFS(base) ((base) + 0x50) #define MSM_BOOT_UART_DM_RXFS_STATE_LSB(x) \ MSM_BOOT_UART_DM_EXTR_BITS(x, 0, 6) #define MSM_BOOT_UART_DM_RXFS_STATE_MSB(x) \ MSM_BOOT_UART_DM_EXTR_BITS(x, 14, 31) #define MSM_BOOT_UART_DM_RXFS_BUF_STATE(x) \ MSM_BOOT_UART_DM_EXTR_BITS(x, 7, 9) #define MSM_BOOT_UART_DM_RXFS_ASYNC_STATE(x) \ MSM_BOOT_UART_DM_EXTR_BITS(x, 10, 13) /* Macros for Common Errors */ #define MSM_BOOT_UART_DM_E_FAILURE 1 #define MSM_BOOT_UART_DM_E_TIMEOUT 2 #define MSM_BOOT_UART_DM_E_INVAL 3 #define MSM_BOOT_UART_DM_E_MALLOC_FAIL 4 #define MSM_BOOT_UART_DM_E_RX_NOT_READY 5 #define UART1_DM_BASE ((void *)0x078af000) #define UART2_DM_BASE ((void *)0x078b1000) enum { BLSP1_UART1, BLSP1_UART2, }; #define FIFO_DATA_SIZE 4 struct uart_params_t { void *uart_dm_base; unsigned int blsp_uart; }; static struct console_input_driver consin = { .havekey = serial_havechar, .getchar = serial_getchar, }; static struct console_output_driver consout = { .putchar = serial_putchar, }; static struct uart_params_t uart_board_param = {}; /** * msm_boot_uart_dm_init_rx_transfer - Init Rx transfer * @uart_dm_base: UART controller base address */ static unsigned int msm_boot_uart_dm_init_rx_transfer(void *uart_dm_base) { /* Reset receiver */ write32(MSM_BOOT_UART_DM_CR(uart_dm_base), MSM_BOOT_UART_DM_CMD_RESET_RX); /* Enable receiver */ write32(MSM_BOOT_UART_DM_CR(uart_dm_base), MSM_BOOT_UART_DM_CR_RX_ENABLE); write32(MSM_BOOT_UART_DM_DMRX(uart_dm_base), MSM_BOOT_UART_DM_DMRX_DEF_VALUE); /* Clear stale event */ write32(MSM_BOOT_UART_DM_CR(uart_dm_base), MSM_BOOT_UART_DM_CMD_RES_STALE_INT); /* Enable stale event */ write32(MSM_BOOT_UART_DM_CR(uart_dm_base), MSM_BOOT_UART_DM_GCMD_ENA_STALE_EVT); return 0; } static unsigned int msm_boot_uart_dm_init(void *uart_dm_base); static int valid_data = 0; static unsigned int word = 0; /** * msm_boot_uart_dm_read - reads a word from the RX FIFO. * @data: location where the read data is stored * @count: no of valid data in the FIFO * * Reads a word from the RX FIFO. If no data is available * returns %MSM_BOOT_UART_DM_E_RX_NOT_READY. */ static unsigned int msm_boot_uart_dm_read(unsigned int *data, int *count) { static int total_rx_data = 0; static int rx_data_read = 0; void *base; uint32_t status_reg; base = uart_board_param.uart_dm_base; if (data == NULL) return MSM_BOOT_UART_DM_E_INVAL; status_reg = read32(MSM_BOOT_UART_DM_MISR(base)); /* Check for DM_RXSTALE for RX transfer to finish */ while (!(status_reg & MSM_BOOT_UART_DM_RXSTALE)) { status_reg = read32(MSM_BOOT_UART_DM_MISR(base)); return MSM_BOOT_UART_DM_E_RX_NOT_READY; } /* Check for Overrun error. We'll just reset Error Status */ if (read32(MSM_BOOT_UART_DM_SR(base)) & MSM_BOOT_UART_DM_SR_UART_OVERRUN) { write32(MSM_BOOT_UART_DM_CR(base), MSM_BOOT_UART_DM_CMD_RESET_ERR_STAT); total_rx_data = rx_data_read = 0; msm_boot_uart_dm_init(base); return MSM_BOOT_UART_DM_E_RX_NOT_READY; } /* Read UART_DM_RX_TOTAL_SNAP for actual number of bytes received */ if (total_rx_data == 0) total_rx_data = read32(MSM_BOOT_UART_DM_RX_TOTAL_SNAP(base)); /* Data available in FIFO; read a word. */ *data = read32(MSM_BOOT_UART_DM_RF(base, 0)); /* increment the total count of chars we've read so far */ rx_data_read += FIFO_DATA_SIZE; /* actual count of valid data in word */ *count = ((total_rx_data < rx_data_read) ? (FIFO_DATA_SIZE - (rx_data_read - total_rx_data)) : FIFO_DATA_SIZE); /* If there are still data left in FIFO we'll read them before * initializing RX Transfer again */ if (rx_data_read < total_rx_data) return 0; msm_boot_uart_dm_init_rx_transfer(base); total_rx_data = rx_data_read = 0; return 0; } void serial_putchar(unsigned int data) { int num_of_chars = 1; void *base = uart_board_param.uart_dm_base; if (data == '\n') { num_of_chars++; data = (data << 8) | '\r'; } /* Wait until transmit FIFO is empty. */ while (!(read32(MSM_BOOT_UART_DM_SR(base)) & MSM_BOOT_UART_DM_SR_TXEMT)) udelay(1); /* * TX FIFO is ready to accept new character(s). First write number of * characters to be transmitted. */ write32(MSM_BOOT_UART_DM_NO_CHARS_FOR_TX(base), num_of_chars); /* And now write the character(s) */ write32(MSM_BOOT_UART_DM_TF(base, 0), data); } /* * msm_boot_uart_dm_reset - resets UART controller * @base: UART controller base address */ static unsigned int msm_boot_uart_dm_reset(void *base) { write32(MSM_BOOT_UART_DM_CR(base), MSM_BOOT_UART_DM_CMD_RESET_RX); write32(MSM_BOOT_UART_DM_CR(base), MSM_BOOT_UART_DM_CMD_RESET_TX); write32(MSM_BOOT_UART_DM_CR(base), MSM_BOOT_UART_DM_CMD_RESET_ERR_STAT); write32(MSM_BOOT_UART_DM_CR(base), MSM_BOOT_UART_DM_CMD_RES_TX_ERR); write32(MSM_BOOT_UART_DM_CR(base), MSM_BOOT_UART_DM_CMD_RES_STALE_INT); return 0; } /* * msm_boot_uart_dm_init - initilaizes UART controller * @uart_dm_base: UART controller base address */ unsigned int msm_boot_uart_dm_init(void *uart_dm_base) { /* Configure UART mode registers MR1 and MR2 */ /* Hardware flow control isn't supported */ write32(MSM_BOOT_UART_DM_MR1(uart_dm_base), 0x0); /* 8-N-1 configuration: 8 data bits - No parity - 1 stop bit */ write32(MSM_BOOT_UART_DM_MR2(uart_dm_base), MSM_BOOT_UART_DM_8_N_1_MODE); /* Configure Interrupt Mask register IMR */ write32(MSM_BOOT_UART_DM_IMR(uart_dm_base), MSM_BOOT_UART_DM_IMR_ENABLED); /* * Configure Tx and Rx watermarks configuration registers * TX watermark value is set to 0 - interrupt is generated when * FIFO level is less than or equal to 0 */ write32(MSM_BOOT_UART_DM_TFWR(uart_dm_base), MSM_BOOT_UART_DM_TFW_VALUE); /* RX watermark value */ write32(MSM_BOOT_UART_DM_RFWR(uart_dm_base), MSM_BOOT_UART_DM_RFW_VALUE); /* Configure Interrupt Programming Register */ /* Set initial Stale timeout value */ write32(MSM_BOOT_UART_DM_IPR(uart_dm_base), MSM_BOOT_UART_DM_STALE_TIMEOUT_LSB); /* Configure IRDA if required */ /* Disabling IRDA mode */ write32(MSM_BOOT_UART_DM_IRDA(uart_dm_base), 0x0); /* Configure hunt character value in HCR register */ /* Keep it in reset state */ write32(MSM_BOOT_UART_DM_HCR(uart_dm_base), 0x0); /* * Configure Rx FIFO base address * Both TX/RX shares same SRAM and default is half-n-half. * Sticking with default value now. * As such RAM size is (2^RAM_ADDR_WIDTH, 32-bit entries). * We have found RAM_ADDR_WIDTH = 0x7f */ /* Issue soft reset command */ msm_boot_uart_dm_reset(uart_dm_base); /* Enable/Disable Rx/Tx DM interfaces */ /* Data Mover not currently utilized. */ write32(MSM_BOOT_UART_DM_DMEN(uart_dm_base), 0x0); /* Enable transmitter */ write32(MSM_BOOT_UART_DM_CR(uart_dm_base), MSM_BOOT_UART_DM_CR_TX_ENABLE); /* Initialize Receive Path */ msm_boot_uart_dm_init_rx_transfer(uart_dm_base); return 0; } /** * serial_havechar - checks if data available for reading * * Returns 1 if data available, 0 otherwise */ int serial_havechar(void) { /* Return if data is already read */ if (valid_data) return 1; /* Read data from the FIFO */ if (msm_boot_uart_dm_read(&word, &valid_data) != 0) return 0; return 1; } /** * qcs405_serial_getc - reads a character * * Returns the character read from serial port. */ int serial_getchar(void) { uint8_t byte; while (!serial_havechar()) ; /* wait for incoming data */ byte = (uint8_t)(word & 0xff); word = word >> 8; valid_data--; return byte; } /* For simplicity sake let's rely on coreboot initalizing the UART. */ void serial_console_init(void) { struct cb_serial *sc_ptr = lib_sysinfo.serial; if (!sc_ptr) return; uart_board_param.uart_dm_base = (void *)(uintptr_t)sc_ptr->baseaddr; /* We should re-initialise uart rx as it gets reset in coreboot. */ write32(MSM_BOOT_UART_DM_IMR(uart_board_param.uart_dm_base), MSM_BOOT_UART_DM_IMR_ENABLED); msm_boot_uart_dm_init_rx_transfer(uart_board_param.uart_dm_base); console_add_output_driver(&consout); console_add_input_driver(&consin); }