diff options
Diffstat (limited to 'payloads/libpayload')
| -rw-r--r-- | payloads/libpayload/Kconfig | 5 | ||||
| -rw-r--r-- | payloads/libpayload/configs/config.mistral | 2 | ||||
| -rw-r--r-- | payloads/libpayload/drivers/Makefile.inc | 1 | ||||
| -rw-r--r-- | payloads/libpayload/drivers/serial/qcs405.c | 555 |
4 files changed, 563 insertions, 0 deletions
diff --git a/payloads/libpayload/Kconfig b/payloads/libpayload/Kconfig index 5dce89ae6f..97b970b0f1 100644 --- a/payloads/libpayload/Kconfig +++ b/payloads/libpayload/Kconfig @@ -258,6 +258,11 @@ config IPQ40XX_SERIAL_CONSOLE depends on SERIAL_CONSOLE default n +config QCS405_SERIAL_CONSOLE + bool "QCS405 SOC compatible serial port driver" + depends on SERIAL_CONSOLE + default n + config PL011_SERIAL_CONSOLE bool "PL011 compatible serial port driver" depends on 8250_SERIAL_CONSOLE diff --git a/payloads/libpayload/configs/config.mistral b/payloads/libpayload/configs/config.mistral index 5f60392fdb..e305fb6700 100644 --- a/payloads/libpayload/configs/config.mistral +++ b/payloads/libpayload/configs/config.mistral @@ -1,3 +1,5 @@ CONFIG_LP_CHROMEOS=y CONFIG_LP_ARCH_ARM64=y CONFIG_LP_TIMER_ARM64_ARCH=y +CONFIG_LP_SERIAL_CONSOLE=y +CONFIG_LP_QCS405_SERIAL_CONSOLE=y diff --git a/payloads/libpayload/drivers/Makefile.inc b/payloads/libpayload/drivers/Makefile.inc index 40e587c223..b4e75943f3 100644 --- a/payloads/libpayload/drivers/Makefile.inc +++ b/payloads/libpayload/drivers/Makefile.inc @@ -37,6 +37,7 @@ libc-$(CONFIG_LP_8250_SERIAL_CONSOLE) += serial/8250.c serial/serial.c libc-$(CONFIG_LP_S5P_SERIAL_CONSOLE) += serial/s5p.c serial/serial.c libc-$(CONFIG_LP_IPQ806X_SERIAL_CONSOLE) += serial/ipq806x.c serial/serial.c libc-$(CONFIG_LP_IPQ40XX_SERIAL_CONSOLE) += serial/ipq40xx.c serial/serial.c +libc-$(CONFIG_LP_QCS405_SERIAL_CONSOLE) += serial/qcs405.c serial/serial.c libc-$(CONFIG_LP_PC_KEYBOARD) += i8042/keyboard.c libc-$(CONFIG_LP_PC_MOUSE) += i8042/mouse.c libc-$(CONFIG_LP_PC_I8042) += i8042/i8042.c diff --git a/payloads/libpayload/drivers/serial/qcs405.c b/payloads/libpayload/drivers/serial/qcs405.c new file mode 100644 index 0000000000..9f02e17263 --- /dev/null +++ b/payloads/libpayload/drivers/serial/qcs405.c @@ -0,0 +1,555 @@ +/* + * 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 <libpayload.h> + +#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; + + /* TODO: We should rely on coreboot init. */ + msm_boot_uart_dm_init(uart_board_param.uart_dm_base); + + console_add_output_driver(&consout); + console_add_input_driver(&consin); +} |