| /* Source : APQ8064 LK boot */ |
| /* SPDX-License-Identifier: BSD-3-Clause */ |
| |
| #include <device/mmio.h> |
| #include <boot/coreboot_tables.h> |
| #include <console/uart.h> |
| #include <delay.h> |
| #include <gpio.h> |
| #include <soc/clock.h> |
| #include <soc/gsbi.h> |
| #include <soc/ipq_uart.h> |
| #include <stdint.h> |
| |
| #define FIFO_DATA_SIZE 4 |
| |
| typedef struct { |
| void *uart_dm_base; |
| void *uart_gsbi_base; |
| unsigned int uart_gsbi; |
| uart_clk_mnd_t mnd_value; |
| gpio_func_data_t dbg_uart_gpio[NO_OF_DBG_UART_GPIOS]; |
| } uart_params_t; |
| |
| /* |
| * All constants lifted from u-boot's |
| * board/qcom/ipq806x_cdp/ipq806x_board_param.h |
| */ |
| static const uart_params_t uart_board_param = { |
| .uart_dm_base = (void *)UART4_DM_BASE, |
| .uart_gsbi_base = (void *)UART_GSBI4_BASE, |
| .uart_gsbi = GSBI_4, |
| .mnd_value = { 12, 625, 313 }, |
| .dbg_uart_gpio = { |
| { |
| .gpio = 10, |
| .func = 1, |
| .dir = GPIO_OUTPUT, |
| .pull = GPIO_NO_PULL, |
| .drvstr = GPIO_12MA, |
| .enable = GPIO_DISABLE |
| }, |
| { |
| .gpio = 11, |
| .func = 1, |
| .dir = GPIO_INPUT, |
| .pull = GPIO_NO_PULL, |
| .drvstr = GPIO_12MA, |
| .enable = GPIO_DISABLE |
| }, |
| } |
| }; |
| |
| /** |
| * msm_boot_uart_dm_init_rx_transfer - Init Rx transfer |
| * @param 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 MSM_BOOT_UART_DM_E_SUCCESS; |
| } |
| |
| static unsigned int msm_boot_uart_dm_init(void *uart_dm_base); |
| |
| /* Received data is valid or not */ |
| static int valid_data = 0; |
| |
| /* Received data */ |
| 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 |
| * @wait: indicates blocking call or not blocking call |
| * |
| * Reads a word from the RX FIFO. If no data is available blocks if |
| * @wait is true, else returns %MSM_BOOT_UART_DM_E_RX_NOT_READY. |
| */ |
| #if 0 /* Not used yet */ |
| static unsigned int |
| msm_boot_uart_dm_read(unsigned int *data, int *count, int wait) |
| { |
| 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 = readl(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 = readl(MSM_BOOT_UART_DM_MISR(base)); |
| if (!wait) |
| return MSM_BOOT_UART_DM_E_RX_NOT_READY; |
| } |
| |
| /* Check for Overrun error. We'll just reset Error Status */ |
| if (readl(MSM_BOOT_UART_DM_SR(base)) & |
| MSM_BOOT_UART_DM_SR_UART_OVERRUN) { |
| writel(MSM_BOOT_UART_DM_CMD_RESET_ERR_STAT, |
| MSM_BOOT_UART_DM_CR(base)); |
| 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 = readl(MSM_BOOT_UART_DM_RX_TOTAL_SNAP(base)); |
| |
| /* Data available in FIFO; read a word. */ |
| *data = readl(MSM_BOOT_UART_DM_RF(base, 0)); |
| |
| /* WAR for http://prism/CR/548280 */ |
| if (*data == 0) { |
| return MSM_BOOT_UART_DM_E_RX_NOT_READY; |
| } |
| |
| /* 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 MSM_BOOT_UART_DM_E_SUCCESS; |
| |
| msm_boot_uart_dm_init_rx_transfer(base); |
| total_rx_data = rx_data_read = 0; |
| |
| return MSM_BOOT_UART_DM_E_SUCCESS; |
| } |
| #endif |
| |
| void uart_tx_byte(unsigned int idx, unsigned char data) |
| { |
| int num_of_chars = 1; |
| unsigned int tx_data = 0; |
| void *base = uart_board_param.uart_dm_base; |
| |
| /* 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), tx_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 MSM_BOOT_UART_DM_E_SUCCESS; |
| } |
| |
| /* |
| * msm_boot_uart_dm_init - initilaizes UART controller |
| * @uart_dm_base: UART controller base address |
| */ |
| static 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; |
| } |
| |
| /** |
| * ipq806x_uart_init - initializes UART |
| * |
| * Initializes clocks, GPIO and UART controller. |
| */ |
| void uart_init(unsigned int idx) |
| { |
| /* Note int idx isn't used in this driver. */ |
| void *dm_base; |
| void *gsbi_base; |
| |
| dm_base = uart_board_param.uart_dm_base; |
| |
| if (read32(MSM_BOOT_UART_DM_CSR(dm_base)) == UART_DM_CLK_RX_TX_BIT_RATE) |
| return; /* UART must have been already initialized. */ |
| |
| gsbi_base = uart_board_param.uart_gsbi_base; |
| ipq_configure_gpio(uart_board_param.dbg_uart_gpio, |
| NO_OF_DBG_UART_GPIOS); |
| |
| /* Configure the uart clock */ |
| uart_clock_config(uart_board_param.uart_gsbi, |
| uart_board_param.mnd_value.m_value, |
| uart_board_param.mnd_value.n_value, |
| uart_board_param.mnd_value.d_value, |
| 0); |
| |
| write32(GSBI_CTRL_REG(gsbi_base), |
| GSBI_PROTOCOL_CODE_I2C_UART << GSBI_CTRL_REG_PROTOCOL_CODE_S); |
| write32(MSM_BOOT_UART_DM_CSR(dm_base), UART_DM_CLK_RX_TX_BIT_RATE); |
| |
| /* Initialize UART_DM */ |
| msm_boot_uart_dm_init(dm_base); |
| } |
| |
| /* for the benefit of non-console uart init */ |
| void ipq806x_uart_init(void) |
| { |
| uart_init(0); |
| } |
| |
| #if 0 /* Not used yet */ |
| uint32_t uartmem_getbaseaddr(void) |
| { |
| return (uint32_t)uart_board_param.uart_dm_base; |
| } |
| #endif |
| |
| /** |
| * uart_tx_flush - transmits a string of data |
| * @s: string to transmit |
| */ |
| void uart_tx_flush(unsigned int idx) |
| { |
| void *base = uart_board_param.uart_dm_base; |
| |
| while (!(read32(MSM_BOOT_UART_DM_SR(base)) & |
| MSM_BOOT_UART_DM_SR_TXEMT)) |
| ; |
| } |
| |
| /** |
| * uart_can_rx_byte - checks if data available for reading |
| * |
| * Returns 1 if data available, 0 otherwise |
| */ |
| #if 0 /* Not used yet */ |
| int uart_can_rx_byte(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) != |
| MSM_BOOT_UART_DM_E_SUCCESS) |
| return 0; |
| |
| return 1; |
| } |
| #endif |
| |
| /** |
| * ipq806x_serial_getc - reads a character |
| * |
| * Returns the character read from serial port. |
| */ |
| uint8_t uart_rx_byte(unsigned int idx) |
| { |
| uint8_t byte; |
| |
| #if 0 /* Not used yet */ |
| while (!uart_can_rx_byte()) { |
| /* wait for incoming data */ |
| } |
| #endif |
| byte = (uint8_t)(word & 0xff); |
| word = word >> 8; |
| valid_data--; |
| |
| return byte; |
| } |
| |
| /* TODO: Implement function */ |
| void uart_fill_lb(void *data) |
| { |
| } |