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/* SPDX-License-Identifier: GPL-2.0-only */
#include <assert.h>
#include <boot/coreboot_tables.h>
#include <console/uart.h>
#include <soc/clock.h>
#include <soc/qcom_qup_se.h>
#include <soc/qupv3_config.h>
#include <types.h>
/* COMMON STATUS/CONFIGURATION REGISTERS AND MASKS */
#define GENI_STATUS_M_GENI_CMD_ACTIVE_MASK 0x1
#define GENI_STATUS_S_GENI_CMD_ACTIVE_MASK 0x1000
#define UART_TX_WATERMARK_MARGIN 4 /* Represented in words */
#define UART_RX_WATERMARK_MARGIN 8 /* Represented in words */
#define UART_RX_RFR_WATERMARK_MARGIN 4 /* Represented in words */
#define UART_TX_BITS_PER_WORD 8
#define UART_RX_BITS_PER_WORD 8
#define START_UART_TX 0x8000000
#define START_UART_RX 0x8000000
/* UART FIFO Packing Configuration. */
/* Start_idx:0, direction:0, len:7, stop:0 */
#define UART_TX_PACK_VECTOR0 0x0E
/* Start_idx:8, direction:0, len:7, stop:0 */
#define UART_TX_PACK_VECTOR1 0x10E
/* Start_idx:16, direction:0, len:7, stop:0 */
#define UART_TX_PACK_VECTOR2 0x20E
/* Start_idx:24, direction:0, len:7, stop:1 */
#define UART_TX_PACK_VECTOR3 0x30F
/* Start_idx:0, direction:0, len:7, stop:1 */
#define UART_RX_PACK_VECTOR0 0xF
#define UART_RX_PACK_VECTOR2 0x00
void uart_tx_flush(int idx)
{
struct qup_regs *regs = qup[idx].regs;
while (read32(®s->geni_status) &
GENI_STATUS_M_GENI_CMD_ACTIVE_MASK)
;
}
void uart_init(int idx)
{
struct qup_regs *regs = qup[idx].regs;
unsigned int reg_value;
unsigned int div, baud_rate, uart_freq;
/*
* If the RX (secondary) sequencer is already active, it means the core
* has been already initialized in the previous stage. Skip
* configuration
*/
if (read32(®s->geni_status) & GENI_STATUS_S_GENI_CMD_ACTIVE_MASK)
return;
qupv3_se_fw_load_and_init(idx, SE_PROTOCOL_UART, FIFO);
clock_enable_qup(idx);
reg_value = read32(®s->geni_fw_revision_ro);
reg_value &= GENI_FW_REVISION_RO_PROTOCOL_MASK;
reg_value >>= GENI_FW_REVISION_RO_PROTOCOL_SHIFT;
assert(reg_value == SE_PROTOCOL_UART);
baud_rate = get_uart_baudrate();
/* sc7180 requires 16 clock pulses to sample 1 bit of data */
uart_freq = baud_rate * 16;
div = DIV_ROUND_CLOSEST(QUPV3_UART_SRC_HZ, uart_freq);
write32(®s->geni_ser_m_clk_cfg, (div << 4) | 1);
write32(®s->geni_ser_s_clk_cfg, (div << 4) | 1);
/* GPIO Configuration */
gpio_configure(qup[idx].pin[2], qup[idx].func[2], GPIO_PULL_UP,
GPIO_2MA, GPIO_OUTPUT);
gpio_configure(qup[idx].pin[3], qup[idx].func[3], GPIO_PULL_UP,
GPIO_2MA, GPIO_INPUT);
write32(®s->geni_tx_watermark_reg, UART_TX_WATERMARK_MARGIN);
write32(®s->geni_rx_watermark_reg, FIFO_DEPTH
- UART_RX_WATERMARK_MARGIN);
write32(®s->geni_rx_rfr_watermark_reg,
FIFO_DEPTH - UART_RX_RFR_WATERMARK_MARGIN);
write32(®s->uart_tx_word_len, UART_TX_BITS_PER_WORD);
write32(®s->uart_rx_word_len, UART_RX_BITS_PER_WORD);
/* Disable TX parity calculation */
write32(®s->uart_tx_parity_cfg, 0x0);
/* Ignore CTS line status for TX communication */
write32(®s->uart_tx_trans_cfg_reg, 0x2);
/* Disable RX parity calculation */
write32(®s->uart_rx_parity_cfg, 0x0);
/* Disable parity, framing and break check on received word */
write32(®s->uart_rx_trans_cfg, 0x0);
/* Set UART TX stop bit len to one UART bit length */
write32(®s->uart_tx_stop_bit_len, 0x0);
write32(®s->uart_rx_stale_cnt, 0x16 * 10);
write32(®s->geni_tx_packing_cfg0, UART_TX_PACK_VECTOR0 |
(UART_TX_PACK_VECTOR1 << 10));
write32(®s->geni_tx_packing_cfg1, UART_TX_PACK_VECTOR2 |
(UART_TX_PACK_VECTOR3 << 10));
write32(®s->geni_rx_packing_cfg0, UART_RX_PACK_VECTOR0);
write32(®s->geni_rx_packing_cfg1, UART_RX_PACK_VECTOR2);
/* Start RX */
write32(®s->geni_s_cmd0, START_UART_RX);
}
unsigned char uart_rx_byte(int idx)
{
struct qup_regs *regs = qup[idx].regs;
if (read32(®s->geni_rx_fifo_status) & RX_FIFO_WC_MSK)
return read32(®s->geni_rx_fifon) & 0xFF;
return 0;
}
void uart_tx_byte(int idx, unsigned char data)
{
struct qup_regs *regs = qup[idx].regs;
uart_tx_flush(idx);
write32(®s->uart_tx_trans_len, 1);
/* Start TX */
write32(®s->geni_m_cmd0, START_UART_TX);
write32(®s->geni_tx_fifon, data);
}
uintptr_t uart_platform_base(int idx)
{
return (uintptr_t)qup[idx].regs;
}
void uart_fill_lb(void *data)
{
struct lb_serial serial = {0};
serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
serial.baseaddr = (uint32_t)uart_platform_base(CONFIG_UART_FOR_CONSOLE);
serial.baud = get_uart_baudrate();
serial.regwidth = 4;
serial.input_hertz = QUPV3_UART_SRC_HZ;
lb_add_serial(&serial, data);
}
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