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author | Varadarajan Narayanan <varada@codeaurora.org> | 2016-03-02 16:57:10 +0530 |
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committer | Patrick Georgi <pgeorgi@google.com> | 2016-05-10 21:34:21 +0200 |
commit | a6935c2508c426f30d6bf5bcf4c3130277a0f998 (patch) | |
tree | e844bb803e8c069101fdf6ec47017af9dc832713 /src/soc/qualcomm/ipq40xx/uart.c | |
parent | c84e2fe893e02de3c5d97d26d05462351ac90d91 (diff) | |
download | coreboot-a6935c2508c426f30d6bf5bcf4c3130277a0f998.tar.xz |
soc/qualcomm/ipq40xx: Initial commit for IPQ40xx SoC support
Copy 'ipq806x' files as a template
BUG=chrome-os-partner:49249
TEST=None. Initial code not sure if it will even compile
BRANCH=none
Original-Commit-Id: dc6a5937953fe61cd4b5a99ca49f9371c4b712d4
Original-Change-Id: If171fcdd3b0561cb6b7dab5f8434de7ef711ea41
Original-Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org>
Original-Signed-off-by: Kan Yan <kyan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/333178
Original-Commit-Ready: David Hendricks <dhendrix@chromium.org>
Original-Tested-by: David Hendricks <dhendrix@chromium.org>
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
squashed:
soc/qualcomm/ipq40xx: Update ipq806x/storm references
Since the files were taken from ipq806x/storm as
template. Update those references to reflect
ipq40xx/gale.
BUG=chrome-os-partner:49249
TEST=None. Initial code not sure if it will even compile
BRANCH=none
Original-Commit-Id: c6c76d184cc92c09e6826fbdc7d7fac59b2cb69b
Original-Change-Id: Ieae1bce25291243b4a6034d37a6949978f318997
Original-Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/333293
Original-Commit-Ready: David Hendricks <dhendrix@chromium.org>
Original-Tested-by: David Hendricks <dhendrix@chromium.org>
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Change-Id: Ie5794c48131ae562861074b406106734541880d9
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/14644
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/soc/qualcomm/ipq40xx/uart.c')
-rw-r--r-- | src/soc/qualcomm/ipq40xx/uart.c | 406 |
1 files changed, 406 insertions, 0 deletions
diff --git a/src/soc/qualcomm/ipq40xx/uart.c b/src/soc/qualcomm/ipq40xx/uart.c new file mode 100644 index 0000000000..99b2b055b7 --- /dev/null +++ b/src/soc/qualcomm/ipq40xx/uart.c @@ -0,0 +1,406 @@ +/* + * Copyright (c) 2012 The Linux Foundation. All rights reserved. + * Source : APQ8064 LK boot + * + * 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 <arch/io.h> +#include <boot/coreboot_tables.h> +#include <console/console.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> +#include <stdlib.h> + +#define FIFO_DATA_SIZE 4 + +typedef struct { + void *uart_dm_base; + void *uart_gsbi_base; + unsigned 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/ipq40xx_cdp/ipq40xx_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 + * @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; +} + +#if IS_ENABLED(CONFIG_DRIVERS_UART) +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(int idx, unsigned char data) +{ + int num_of_chars = 1; + unsigned 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); +} +#endif /* CONFIG_SERIAL_UART */ + +/* + * 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; +} + +/** + * ipq40xx_uart_init - initializes UART + * + * Initializes clocks, GPIO and UART controller. + */ +void uart_init(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 ipq40xx_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(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 + +#if IS_ENABLED(CONFIG_DRIVERS_UART) +/** + * ipq40xx_serial_getc - reads a character + * + * Returns the character read from serial port. + */ +uint8_t uart_rx_byte(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; +} +#endif + +#ifndef __PRE_RAM__ +/* TODO: Implement function */ +void uart_fill_lb(void *data) +{ +} +#endif |