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