| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Drivers for CSR SiRFprimaII onboard UARTs. |
| * |
| * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. |
| */ |
| #include <linux/bitops.h> |
| #include <linux/log2.h> |
| #include <linux/hrtimer.h> |
| struct sirfsoc_uart_param { |
| const char *uart_name; |
| const char *port_name; |
| }; |
| |
| struct sirfsoc_register { |
| /* hardware uart specific */ |
| u32 sirfsoc_line_ctrl; |
| u32 sirfsoc_divisor; |
| /* uart - usp common */ |
| u32 sirfsoc_tx_rx_en; |
| u32 sirfsoc_int_en_reg; |
| u32 sirfsoc_int_st_reg; |
| u32 sirfsoc_int_en_clr_reg; |
| u32 sirfsoc_tx_dma_io_ctrl; |
| u32 sirfsoc_tx_dma_io_len; |
| u32 sirfsoc_tx_fifo_ctrl; |
| u32 sirfsoc_tx_fifo_level_chk; |
| u32 sirfsoc_tx_fifo_op; |
| u32 sirfsoc_tx_fifo_status; |
| u32 sirfsoc_tx_fifo_data; |
| u32 sirfsoc_rx_dma_io_ctrl; |
| u32 sirfsoc_rx_dma_io_len; |
| u32 sirfsoc_rx_fifo_ctrl; |
| u32 sirfsoc_rx_fifo_level_chk; |
| u32 sirfsoc_rx_fifo_op; |
| u32 sirfsoc_rx_fifo_status; |
| u32 sirfsoc_rx_fifo_data; |
| u32 sirfsoc_afc_ctrl; |
| u32 sirfsoc_swh_dma_io; |
| /* hardware usp specific */ |
| u32 sirfsoc_mode1; |
| u32 sirfsoc_mode2; |
| u32 sirfsoc_tx_frame_ctrl; |
| u32 sirfsoc_rx_frame_ctrl; |
| u32 sirfsoc_async_param_reg; |
| }; |
| |
| typedef u32 (*fifo_full_mask)(struct uart_port *port); |
| typedef u32 (*fifo_empty_mask)(struct uart_port *port); |
| |
| struct sirfsoc_fifo_status { |
| fifo_full_mask ff_full; |
| fifo_empty_mask ff_empty; |
| }; |
| |
| struct sirfsoc_int_en { |
| u32 sirfsoc_rx_done_en; |
| u32 sirfsoc_tx_done_en; |
| u32 sirfsoc_rx_oflow_en; |
| u32 sirfsoc_tx_allout_en; |
| u32 sirfsoc_rx_io_dma_en; |
| u32 sirfsoc_tx_io_dma_en; |
| u32 sirfsoc_rxfifo_full_en; |
| u32 sirfsoc_txfifo_empty_en; |
| u32 sirfsoc_rxfifo_thd_en; |
| u32 sirfsoc_txfifo_thd_en; |
| u32 sirfsoc_frm_err_en; |
| u32 sirfsoc_rxd_brk_en; |
| u32 sirfsoc_rx_timeout_en; |
| u32 sirfsoc_parity_err_en; |
| u32 sirfsoc_cts_en; |
| u32 sirfsoc_rts_en; |
| }; |
| |
| struct sirfsoc_int_status { |
| u32 sirfsoc_rx_done; |
| u32 sirfsoc_tx_done; |
| u32 sirfsoc_rx_oflow; |
| u32 sirfsoc_tx_allout; |
| u32 sirfsoc_rx_io_dma; |
| u32 sirfsoc_tx_io_dma; |
| u32 sirfsoc_rxfifo_full; |
| u32 sirfsoc_txfifo_empty; |
| u32 sirfsoc_rxfifo_thd; |
| u32 sirfsoc_txfifo_thd; |
| u32 sirfsoc_frm_err; |
| u32 sirfsoc_rxd_brk; |
| u32 sirfsoc_rx_timeout; |
| u32 sirfsoc_parity_err; |
| u32 sirfsoc_cts; |
| u32 sirfsoc_rts; |
| }; |
| |
| enum sirfsoc_uart_type { |
| SIRF_REAL_UART, |
| SIRF_USP_UART, |
| }; |
| |
| struct sirfsoc_uart_register { |
| struct sirfsoc_register uart_reg; |
| struct sirfsoc_int_en uart_int_en; |
| struct sirfsoc_int_status uart_int_st; |
| struct sirfsoc_fifo_status fifo_status; |
| struct sirfsoc_uart_param uart_param; |
| enum sirfsoc_uart_type uart_type; |
| }; |
| |
| static u32 uart_usp_ff_full_mask(struct uart_port *port) |
| { |
| u32 full_bit; |
| |
| full_bit = ilog2(port->fifosize); |
| return (1 << full_bit); |
| } |
| |
| static u32 uart_usp_ff_empty_mask(struct uart_port *port) |
| { |
| u32 empty_bit; |
| |
| empty_bit = ilog2(port->fifosize) + 1; |
| return (1 << empty_bit); |
| } |
| struct sirfsoc_uart_register sirfsoc_usp = { |
| .uart_reg = { |
| .sirfsoc_mode1 = 0x0000, |
| .sirfsoc_mode2 = 0x0004, |
| .sirfsoc_tx_frame_ctrl = 0x0008, |
| .sirfsoc_rx_frame_ctrl = 0x000c, |
| .sirfsoc_tx_rx_en = 0x0010, |
| .sirfsoc_int_en_reg = 0x0014, |
| .sirfsoc_int_st_reg = 0x0018, |
| .sirfsoc_async_param_reg = 0x0024, |
| .sirfsoc_tx_dma_io_ctrl = 0x0100, |
| .sirfsoc_tx_dma_io_len = 0x0104, |
| .sirfsoc_tx_fifo_ctrl = 0x0108, |
| .sirfsoc_tx_fifo_level_chk = 0x010c, |
| .sirfsoc_tx_fifo_op = 0x0110, |
| .sirfsoc_tx_fifo_status = 0x0114, |
| .sirfsoc_tx_fifo_data = 0x0118, |
| .sirfsoc_rx_dma_io_ctrl = 0x0120, |
| .sirfsoc_rx_dma_io_len = 0x0124, |
| .sirfsoc_rx_fifo_ctrl = 0x0128, |
| .sirfsoc_rx_fifo_level_chk = 0x012c, |
| .sirfsoc_rx_fifo_op = 0x0130, |
| .sirfsoc_rx_fifo_status = 0x0134, |
| .sirfsoc_rx_fifo_data = 0x0138, |
| .sirfsoc_int_en_clr_reg = 0x140, |
| }, |
| .uart_int_en = { |
| .sirfsoc_rx_done_en = BIT(0), |
| .sirfsoc_tx_done_en = BIT(1), |
| .sirfsoc_rx_oflow_en = BIT(2), |
| .sirfsoc_tx_allout_en = BIT(3), |
| .sirfsoc_rx_io_dma_en = BIT(4), |
| .sirfsoc_tx_io_dma_en = BIT(5), |
| .sirfsoc_rxfifo_full_en = BIT(6), |
| .sirfsoc_txfifo_empty_en = BIT(7), |
| .sirfsoc_rxfifo_thd_en = BIT(8), |
| .sirfsoc_txfifo_thd_en = BIT(9), |
| .sirfsoc_frm_err_en = BIT(10), |
| .sirfsoc_rx_timeout_en = BIT(11), |
| .sirfsoc_rxd_brk_en = BIT(15), |
| }, |
| .uart_int_st = { |
| .sirfsoc_rx_done = BIT(0), |
| .sirfsoc_tx_done = BIT(1), |
| .sirfsoc_rx_oflow = BIT(2), |
| .sirfsoc_tx_allout = BIT(3), |
| .sirfsoc_rx_io_dma = BIT(4), |
| .sirfsoc_tx_io_dma = BIT(5), |
| .sirfsoc_rxfifo_full = BIT(6), |
| .sirfsoc_txfifo_empty = BIT(7), |
| .sirfsoc_rxfifo_thd = BIT(8), |
| .sirfsoc_txfifo_thd = BIT(9), |
| .sirfsoc_frm_err = BIT(10), |
| .sirfsoc_rx_timeout = BIT(11), |
| .sirfsoc_rxd_brk = BIT(15), |
| }, |
| .fifo_status = { |
| .ff_full = uart_usp_ff_full_mask, |
| .ff_empty = uart_usp_ff_empty_mask, |
| }, |
| .uart_param = { |
| .uart_name = "ttySiRF", |
| .port_name = "sirfsoc-uart", |
| }, |
| }; |
| |
| struct sirfsoc_uart_register sirfsoc_uart = { |
| .uart_reg = { |
| .sirfsoc_line_ctrl = 0x0040, |
| .sirfsoc_tx_rx_en = 0x004c, |
| .sirfsoc_divisor = 0x0050, |
| .sirfsoc_int_en_reg = 0x0054, |
| .sirfsoc_int_st_reg = 0x0058, |
| .sirfsoc_int_en_clr_reg = 0x0060, |
| .sirfsoc_tx_dma_io_ctrl = 0x0100, |
| .sirfsoc_tx_dma_io_len = 0x0104, |
| .sirfsoc_tx_fifo_ctrl = 0x0108, |
| .sirfsoc_tx_fifo_level_chk = 0x010c, |
| .sirfsoc_tx_fifo_op = 0x0110, |
| .sirfsoc_tx_fifo_status = 0x0114, |
| .sirfsoc_tx_fifo_data = 0x0118, |
| .sirfsoc_rx_dma_io_ctrl = 0x0120, |
| .sirfsoc_rx_dma_io_len = 0x0124, |
| .sirfsoc_rx_fifo_ctrl = 0x0128, |
| .sirfsoc_rx_fifo_level_chk = 0x012c, |
| .sirfsoc_rx_fifo_op = 0x0130, |
| .sirfsoc_rx_fifo_status = 0x0134, |
| .sirfsoc_rx_fifo_data = 0x0138, |
| .sirfsoc_afc_ctrl = 0x0140, |
| .sirfsoc_swh_dma_io = 0x0148, |
| }, |
| .uart_int_en = { |
| .sirfsoc_rx_done_en = BIT(0), |
| .sirfsoc_tx_done_en = BIT(1), |
| .sirfsoc_rx_oflow_en = BIT(2), |
| .sirfsoc_tx_allout_en = BIT(3), |
| .sirfsoc_rx_io_dma_en = BIT(4), |
| .sirfsoc_tx_io_dma_en = BIT(5), |
| .sirfsoc_rxfifo_full_en = BIT(6), |
| .sirfsoc_txfifo_empty_en = BIT(7), |
| .sirfsoc_rxfifo_thd_en = BIT(8), |
| .sirfsoc_txfifo_thd_en = BIT(9), |
| .sirfsoc_frm_err_en = BIT(10), |
| .sirfsoc_rxd_brk_en = BIT(11), |
| .sirfsoc_rx_timeout_en = BIT(12), |
| .sirfsoc_parity_err_en = BIT(13), |
| .sirfsoc_cts_en = BIT(14), |
| .sirfsoc_rts_en = BIT(15), |
| }, |
| .uart_int_st = { |
| .sirfsoc_rx_done = BIT(0), |
| .sirfsoc_tx_done = BIT(1), |
| .sirfsoc_rx_oflow = BIT(2), |
| .sirfsoc_tx_allout = BIT(3), |
| .sirfsoc_rx_io_dma = BIT(4), |
| .sirfsoc_tx_io_dma = BIT(5), |
| .sirfsoc_rxfifo_full = BIT(6), |
| .sirfsoc_txfifo_empty = BIT(7), |
| .sirfsoc_rxfifo_thd = BIT(8), |
| .sirfsoc_txfifo_thd = BIT(9), |
| .sirfsoc_frm_err = BIT(10), |
| .sirfsoc_rxd_brk = BIT(11), |
| .sirfsoc_rx_timeout = BIT(12), |
| .sirfsoc_parity_err = BIT(13), |
| .sirfsoc_cts = BIT(14), |
| .sirfsoc_rts = BIT(15), |
| }, |
| .fifo_status = { |
| .ff_full = uart_usp_ff_full_mask, |
| .ff_empty = uart_usp_ff_empty_mask, |
| }, |
| .uart_param = { |
| .uart_name = "ttySiRF", |
| .port_name = "sirfsoc_uart", |
| }, |
| }; |
| /* uart io ctrl */ |
| #define SIRFUART_DATA_BIT_LEN_MASK 0x3 |
| #define SIRFUART_DATA_BIT_LEN_5 BIT(0) |
| #define SIRFUART_DATA_BIT_LEN_6 1 |
| #define SIRFUART_DATA_BIT_LEN_7 2 |
| #define SIRFUART_DATA_BIT_LEN_8 3 |
| #define SIRFUART_STOP_BIT_LEN_1 0 |
| #define SIRFUART_STOP_BIT_LEN_2 BIT(2) |
| #define SIRFUART_PARITY_EN BIT(3) |
| #define SIRFUART_EVEN_BIT BIT(4) |
| #define SIRFUART_STICK_BIT_MASK (7 << 3) |
| #define SIRFUART_STICK_BIT_NONE (0 << 3) |
| #define SIRFUART_STICK_BIT_EVEN BIT(3) |
| #define SIRFUART_STICK_BIT_ODD (3 << 3) |
| #define SIRFUART_STICK_BIT_MARK (5 << 3) |
| #define SIRFUART_STICK_BIT_SPACE (7 << 3) |
| #define SIRFUART_SET_BREAK BIT(6) |
| #define SIRFUART_LOOP_BACK BIT(7) |
| #define SIRFUART_PARITY_MASK (7 << 3) |
| #define SIRFUART_DUMMY_READ BIT(16) |
| #define SIRFUART_AFC_CTRL_RX_THD 0x70 |
| #define SIRFUART_AFC_RX_EN BIT(8) |
| #define SIRFUART_AFC_TX_EN BIT(9) |
| #define SIRFUART_AFC_CTS_CTRL BIT(10) |
| #define SIRFUART_AFC_RTS_CTRL BIT(11) |
| #define SIRFUART_AFC_CTS_STATUS BIT(12) |
| #define SIRFUART_AFC_RTS_STATUS BIT(13) |
| /* UART FIFO Register */ |
| #define SIRFUART_FIFO_STOP 0x0 |
| #define SIRFUART_FIFO_RESET BIT(0) |
| #define SIRFUART_FIFO_START BIT(1) |
| |
| #define SIRFUART_RX_EN BIT(0) |
| #define SIRFUART_TX_EN BIT(1) |
| |
| #define SIRFUART_IO_MODE BIT(0) |
| #define SIRFUART_DMA_MODE 0x0 |
| #define SIRFUART_RX_DMA_FLUSH 0x4 |
| |
| #define SIRFUART_CLEAR_RX_ADDR_EN 0x2 |
| /* Baud Rate Calculation */ |
| #define SIRF_USP_MIN_SAMPLE_DIV 0x1 |
| #define SIRF_MIN_SAMPLE_DIV 0xf |
| #define SIRF_MAX_SAMPLE_DIV 0x3f |
| #define SIRF_IOCLK_DIV_MAX 0xffff |
| #define SIRF_SAMPLE_DIV_SHIFT 16 |
| #define SIRF_IOCLK_DIV_MASK 0xffff |
| #define SIRF_SAMPLE_DIV_MASK 0x3f0000 |
| #define SIRF_BAUD_RATE_SUPPORT_NR 18 |
| |
| /* USP SPEC */ |
| #define SIRFSOC_USP_ENDIAN_CTRL_LSBF BIT(4) |
| #define SIRFSOC_USP_EN BIT(5) |
| #define SIRFSOC_USP_MODE2_RXD_DELAY_OFFSET 0 |
| #define SIRFSOC_USP_MODE2_TXD_DELAY_OFFSET 8 |
| #define SIRFSOC_USP_MODE2_CLK_DIVISOR_MASK 0x3ff |
| #define SIRFSOC_USP_MODE2_CLK_DIVISOR_OFFSET 21 |
| #define SIRFSOC_USP_TX_DATA_LEN_OFFSET 0 |
| #define SIRFSOC_USP_TX_SYNC_LEN_OFFSET 8 |
| #define SIRFSOC_USP_TX_FRAME_LEN_OFFSET 16 |
| #define SIRFSOC_USP_TX_SHIFTER_LEN_OFFSET 24 |
| #define SIRFSOC_USP_TX_CLK_DIVISOR_OFFSET 30 |
| #define SIRFSOC_USP_RX_DATA_LEN_OFFSET 0 |
| #define SIRFSOC_USP_RX_FRAME_LEN_OFFSET 8 |
| #define SIRFSOC_USP_RX_SHIFTER_LEN_OFFSET 16 |
| #define SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET 24 |
| #define SIRFSOC_USP_ASYNC_DIV2_MASK 0x3f |
| #define SIRFSOC_USP_ASYNC_DIV2_OFFSET 16 |
| #define SIRFSOC_USP_LOOP_BACK_CTRL BIT(2) |
| #define SIRFSOC_USP_FRADDR_CLR_EN BIT(1) |
| /* USP-UART Common */ |
| #define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000) |
| #define SIRFUART_RECV_TIMEOUT_VALUE(x) \ |
| (((x) > 0xFFFF) ? 0xFFFF : ((x) & 0xFFFF)) |
| #define SIRFUART_USP_RECV_TIMEOUT(x) (x & 0xFFFF) |
| #define SIRFUART_UART_RECV_TIMEOUT(x) ((x & 0xFFFF) << 16) |
| |
| #define SIRFUART_FIFO_THD(port) (port->fifosize >> 1) |
| #define SIRFUART_ERR_INT_STAT(unit_st, uart_type) \ |
| (uint_st->sirfsoc_rx_oflow | \ |
| uint_st->sirfsoc_frm_err | \ |
| uint_st->sirfsoc_rxd_brk | \ |
| ((uart_type != SIRF_REAL_UART) ? \ |
| 0 : uint_st->sirfsoc_parity_err)) |
| #define SIRFUART_RX_IO_INT_EN(uint_en, uart_type) \ |
| (uint_en->sirfsoc_rx_done_en |\ |
| uint_en->sirfsoc_rxfifo_thd_en |\ |
| uint_en->sirfsoc_rxfifo_full_en |\ |
| uint_en->sirfsoc_frm_err_en |\ |
| uint_en->sirfsoc_rx_oflow_en |\ |
| uint_en->sirfsoc_rxd_brk_en |\ |
| ((uart_type != SIRF_REAL_UART) ? \ |
| 0 : uint_en->sirfsoc_parity_err_en)) |
| #define SIRFUART_RX_IO_INT_ST(uint_st) \ |
| (uint_st->sirfsoc_rxfifo_thd |\ |
| uint_st->sirfsoc_rxfifo_full|\ |
| uint_st->sirfsoc_rx_done |\ |
| uint_st->sirfsoc_rx_timeout) |
| #define SIRFUART_CTS_INT_ST(uint_st) (uint_st->sirfsoc_cts) |
| #define SIRFUART_RX_DMA_INT_EN(uint_en, uart_type) \ |
| (uint_en->sirfsoc_frm_err_en |\ |
| uint_en->sirfsoc_rx_oflow_en |\ |
| uint_en->sirfsoc_rxd_brk_en |\ |
| ((uart_type != SIRF_REAL_UART) ? \ |
| 0 : uint_en->sirfsoc_parity_err_en)) |
| /* Generic Definitions */ |
| #define SIRFSOC_UART_NAME "ttySiRF" |
| #define SIRFSOC_UART_MAJOR 0 |
| #define SIRFSOC_UART_MINOR 0 |
| #define SIRFUART_PORT_NAME "sirfsoc-uart" |
| #define SIRFUART_MAP_SIZE 0x200 |
| #define SIRFSOC_UART_NR 11 |
| #define SIRFSOC_PORT_TYPE 0xa5 |
| |
| /* Uart Common Use Macro*/ |
| #define SIRFSOC_RX_DMA_BUF_SIZE (1024 * 32) |
| #define BYTES_TO_ALIGN(dma_addr) ((unsigned long)(dma_addr) & 0x3) |
| /* Uart Fifo Level Chk */ |
| #define SIRFUART_TX_FIFO_SC_OFFSET 0 |
| #define SIRFUART_TX_FIFO_LC_OFFSET 10 |
| #define SIRFUART_TX_FIFO_HC_OFFSET 20 |
| #define SIRFUART_TX_FIFO_CHK_SC(line, value) ((((line) == 1) ? (value & 0x3) :\ |
| (value & 0x1f)) << SIRFUART_TX_FIFO_SC_OFFSET) |
| #define SIRFUART_TX_FIFO_CHK_LC(line, value) ((((line) == 1) ? (value & 0x3) :\ |
| (value & 0x1f)) << SIRFUART_TX_FIFO_LC_OFFSET) |
| #define SIRFUART_TX_FIFO_CHK_HC(line, value) ((((line) == 1) ? (value & 0x3) :\ |
| (value & 0x1f)) << SIRFUART_TX_FIFO_HC_OFFSET) |
| |
| #define SIRFUART_RX_FIFO_CHK_SC SIRFUART_TX_FIFO_CHK_SC |
| #define SIRFUART_RX_FIFO_CHK_LC SIRFUART_TX_FIFO_CHK_LC |
| #define SIRFUART_RX_FIFO_CHK_HC SIRFUART_TX_FIFO_CHK_HC |
| #define SIRFUART_RX_FIFO_MASK 0x7f |
| /* Indicate how many buffers used */ |
| |
| /* For Fast Baud Rate Calculation */ |
| struct sirfsoc_baudrate_to_regv { |
| unsigned int baud_rate; |
| unsigned int reg_val; |
| }; |
| |
| enum sirfsoc_tx_state { |
| TX_DMA_IDLE, |
| TX_DMA_RUNNING, |
| TX_DMA_PAUSE, |
| }; |
| |
| struct sirfsoc_rx_buffer { |
| struct circ_buf xmit; |
| dma_cookie_t cookie; |
| struct dma_async_tx_descriptor *desc; |
| dma_addr_t dma_addr; |
| }; |
| |
| struct sirfsoc_uart_port { |
| bool hw_flow_ctrl; |
| bool ms_enabled; |
| |
| struct uart_port port; |
| struct clk *clk; |
| /* for SiRFatlas7, there are SET/CLR for UART_INT_EN */ |
| bool is_atlas7; |
| struct sirfsoc_uart_register *uart_reg; |
| struct dma_chan *rx_dma_chan; |
| struct dma_chan *tx_dma_chan; |
| dma_addr_t tx_dma_addr; |
| struct dma_async_tx_descriptor *tx_dma_desc; |
| unsigned long transfer_size; |
| enum sirfsoc_tx_state tx_dma_state; |
| unsigned int cts_gpio; |
| unsigned int rts_gpio; |
| |
| struct sirfsoc_rx_buffer rx_dma_items; |
| struct hrtimer hrt; |
| bool is_hrt_enabled; |
| unsigned long rx_period_time; |
| unsigned long rx_last_pos; |
| unsigned long pio_fetch_cnt; |
| }; |
| |
| /* Register Access Control */ |
| #define portaddr(port, reg) ((port)->membase + (reg)) |
| #define rd_regl(port, reg) (__raw_readl(portaddr(port, reg))) |
| #define wr_regl(port, reg, val) __raw_writel(val, portaddr(port, reg)) |
| |
| /* UART Port Mask */ |
| #define SIRFUART_FIFOLEVEL_MASK(port) ((port->fifosize - 1) & 0xFFF) |
| #define SIRFUART_FIFOFULL_MASK(port) (port->fifosize & 0xFFF) |
| #define SIRFUART_FIFOEMPTY_MASK(port) ((port->fifosize & 0xFFF) << 1) |
