diff options
Diffstat (limited to 'drivers/tty/serial/sirfsoc_uart.c')
| -rw-r--r-- | drivers/tty/serial/sirfsoc_uart.c | 1503 |
1 files changed, 0 insertions, 1503 deletions
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c deleted file mode 100644 index 38622f2a30a9..000000000000 --- a/drivers/tty/serial/sirfsoc_uart.c +++ /dev/null @@ -1,1503 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Driver for CSR SiRFprimaII onboard UARTs. - * - * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. - */ - -#include <linux/module.h> -#include <linux/ioport.h> -#include <linux/platform_device.h> -#include <linux/init.h> -#include <linux/sysrq.h> -#include <linux/console.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/serial_core.h> -#include <linux/serial.h> -#include <linux/clk.h> -#include <linux/of.h> -#include <linux/slab.h> -#include <linux/io.h> -#include <linux/of_gpio.h> -#include <linux/dmaengine.h> -#include <linux/dma-direction.h> -#include <linux/dma-mapping.h> -#include <asm/irq.h> -#include <asm/mach/irq.h> - -#include "sirfsoc_uart.h" - -static unsigned int -sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count); -static unsigned int -sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count); -static struct uart_driver sirfsoc_uart_drv; - -static void sirfsoc_uart_tx_dma_complete_callback(void *param); -static const struct sirfsoc_baudrate_to_regv baudrate_to_regv[] = { - {4000000, 2359296}, - {3500000, 1310721}, - {3000000, 1572865}, - {2500000, 1245186}, - {2000000, 1572866}, - {1500000, 1245188}, - {1152000, 1638404}, - {1000000, 1572869}, - {921600, 1114120}, - {576000, 1245196}, - {500000, 1245198}, - {460800, 1572876}, - {230400, 1310750}, - {115200, 1310781}, - {57600, 1310843}, - {38400, 1114328}, - {19200, 1114545}, - {9600, 1114979}, -}; - -static struct sirfsoc_uart_port *sirf_ports[SIRFSOC_UART_NR]; - -static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port) -{ - return container_of(port, struct sirfsoc_uart_port, port); -} - -static inline unsigned int sirfsoc_uart_tx_empty(struct uart_port *port) -{ - unsigned long reg; - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; - reg = rd_regl(port, ureg->sirfsoc_tx_fifo_status); - return (reg & ufifo_st->ff_empty(port)) ? TIOCSER_TEMT : 0; -} - -static unsigned int sirfsoc_uart_get_mctrl(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled) - goto cts_asserted; - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { - if (!(rd_regl(port, ureg->sirfsoc_afc_ctrl) & - SIRFUART_AFC_CTS_STATUS)) - goto cts_asserted; - else - goto cts_deasserted; - } else { - if (!gpio_get_value(sirfport->cts_gpio)) - goto cts_asserted; - else - goto cts_deasserted; - } -cts_deasserted: - return TIOCM_CAR | TIOCM_DSR; -cts_asserted: - return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; -} - -static void sirfsoc_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - unsigned int assert = mctrl & TIOCM_RTS; - unsigned int val = assert ? SIRFUART_AFC_CTRL_RX_THD : 0x0; - unsigned int current_val; - - if (mctrl & TIOCM_LOOP) { - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) - wr_regl(port, ureg->sirfsoc_line_ctrl, - rd_regl(port, ureg->sirfsoc_line_ctrl) | - SIRFUART_LOOP_BACK); - else - wr_regl(port, ureg->sirfsoc_mode1, - rd_regl(port, ureg->sirfsoc_mode1) | - SIRFSOC_USP_LOOP_BACK_CTRL); - } else { - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) - wr_regl(port, ureg->sirfsoc_line_ctrl, - rd_regl(port, ureg->sirfsoc_line_ctrl) & - ~SIRFUART_LOOP_BACK); - else - wr_regl(port, ureg->sirfsoc_mode1, - rd_regl(port, ureg->sirfsoc_mode1) & - ~SIRFSOC_USP_LOOP_BACK_CTRL); - } - - if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled) - return; - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { - current_val = rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0xFF; - val |= current_val; - wr_regl(port, ureg->sirfsoc_afc_ctrl, val); - } else { - if (!val) - gpio_set_value(sirfport->rts_gpio, 1); - else - gpio_set_value(sirfport->rts_gpio, 0); - } -} - -static void sirfsoc_uart_stop_tx(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - - if (sirfport->tx_dma_chan) { - if (sirfport->tx_dma_state == TX_DMA_RUNNING) { - dmaengine_pause(sirfport->tx_dma_chan); - sirfport->tx_dma_state = TX_DMA_PAUSE; - } else { - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) & - ~uint_en->sirfsoc_txfifo_empty_en); - else - wr_regl(port, ureg->sirfsoc_int_en_clr_reg, - uint_en->sirfsoc_txfifo_empty_en); - } - } else { - if (sirfport->uart_reg->uart_type == SIRF_USP_UART) - wr_regl(port, ureg->sirfsoc_tx_rx_en, rd_regl(port, - ureg->sirfsoc_tx_rx_en) & ~SIRFUART_TX_EN); - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) & - ~uint_en->sirfsoc_txfifo_empty_en); - else - wr_regl(port, ureg->sirfsoc_int_en_clr_reg, - uint_en->sirfsoc_txfifo_empty_en); - } -} - -static void sirfsoc_uart_tx_with_dma(struct sirfsoc_uart_port *sirfport) -{ - struct uart_port *port = &sirfport->port; - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - struct circ_buf *xmit = &port->state->xmit; - unsigned long tran_size; - unsigned long tran_start; - unsigned long pio_tx_size; - - tran_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); - tran_start = (unsigned long)(xmit->buf + xmit->tail); - if (uart_circ_empty(xmit) || uart_tx_stopped(port) || - !tran_size) - return; - if (sirfport->tx_dma_state == TX_DMA_PAUSE) { - dmaengine_resume(sirfport->tx_dma_chan); - return; - } - if (sirfport->tx_dma_state == TX_DMA_RUNNING) - return; - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg)& - ~(uint_en->sirfsoc_txfifo_empty_en)); - else - wr_regl(port, ureg->sirfsoc_int_en_clr_reg, - uint_en->sirfsoc_txfifo_empty_en); - /* - * DMA requires buffer address and buffer length are both aligned with - * 4 bytes, so we use PIO for - * 1. if address is not aligned with 4bytes, use PIO for the first 1~3 - * bytes, and move to DMA for the left part aligned with 4bytes - * 2. if buffer length is not aligned with 4bytes, use DMA for aligned - * part first, move to PIO for the left 1~3 bytes - */ - if (tran_size < 4 || BYTES_TO_ALIGN(tran_start)) { - wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP); - wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)| - SIRFUART_IO_MODE); - if (BYTES_TO_ALIGN(tran_start)) { - pio_tx_size = sirfsoc_uart_pio_tx_chars(sirfport, - BYTES_TO_ALIGN(tran_start)); - tran_size -= pio_tx_size; - } - if (tran_size < 4) - sirfsoc_uart_pio_tx_chars(sirfport, tran_size); - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg)| - uint_en->sirfsoc_txfifo_empty_en); - else - wr_regl(port, ureg->sirfsoc_int_en_reg, - uint_en->sirfsoc_txfifo_empty_en); - wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START); - } else { - /* tx transfer mode switch into dma mode */ - wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP); - wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl)& - ~SIRFUART_IO_MODE); - wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START); - tran_size &= ~(0x3); - - sirfport->tx_dma_addr = dma_map_single(port->dev, - xmit->buf + xmit->tail, - tran_size, DMA_TO_DEVICE); - sirfport->tx_dma_desc = dmaengine_prep_slave_single( - sirfport->tx_dma_chan, sirfport->tx_dma_addr, - tran_size, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); - if (!sirfport->tx_dma_desc) { - dev_err(port->dev, "DMA prep slave single fail\n"); - return; - } - sirfport->tx_dma_desc->callback = - sirfsoc_uart_tx_dma_complete_callback; - sirfport->tx_dma_desc->callback_param = (void *)sirfport; - sirfport->transfer_size = tran_size; - - dmaengine_submit(sirfport->tx_dma_desc); - dma_async_issue_pending(sirfport->tx_dma_chan); - sirfport->tx_dma_state = TX_DMA_RUNNING; - } -} - -static void sirfsoc_uart_start_tx(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - if (sirfport->tx_dma_chan) - sirfsoc_uart_tx_with_dma(sirfport); - else { - if (sirfport->uart_reg->uart_type == SIRF_USP_UART) - wr_regl(port, ureg->sirfsoc_tx_rx_en, rd_regl(port, - ureg->sirfsoc_tx_rx_en) | SIRFUART_TX_EN); - wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_STOP); - sirfsoc_uart_pio_tx_chars(sirfport, port->fifosize); - wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START); - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg)| - uint_en->sirfsoc_txfifo_empty_en); - else - wr_regl(port, ureg->sirfsoc_int_en_reg, - uint_en->sirfsoc_txfifo_empty_en); - } -} - -static void sirfsoc_uart_stop_rx(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - - wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0); - if (sirfport->rx_dma_chan) { - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) & - ~(SIRFUART_RX_DMA_INT_EN(uint_en, - sirfport->uart_reg->uart_type) | - uint_en->sirfsoc_rx_done_en)); - else - wr_regl(port, ureg->sirfsoc_int_en_clr_reg, - SIRFUART_RX_DMA_INT_EN(uint_en, - sirfport->uart_reg->uart_type)| - uint_en->sirfsoc_rx_done_en); - dmaengine_terminate_all(sirfport->rx_dma_chan); - } else { - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg)& - ~(SIRFUART_RX_IO_INT_EN(uint_en, - sirfport->uart_reg->uart_type))); - else - wr_regl(port, ureg->sirfsoc_int_en_clr_reg, - SIRFUART_RX_IO_INT_EN(uint_en, - sirfport->uart_reg->uart_type)); - } -} - -static void sirfsoc_uart_disable_ms(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - - if (!sirfport->hw_flow_ctrl) - return; - sirfport->ms_enabled = false; - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { - wr_regl(port, ureg->sirfsoc_afc_ctrl, - rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0x3FF); - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg)& - ~uint_en->sirfsoc_cts_en); - else - wr_regl(port, ureg->sirfsoc_int_en_clr_reg, - uint_en->sirfsoc_cts_en); - } else - disable_irq(gpio_to_irq(sirfport->cts_gpio)); -} - -static irqreturn_t sirfsoc_uart_usp_cts_handler(int irq, void *dev_id) -{ - struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id; - struct uart_port *port = &sirfport->port; - spin_lock(&port->lock); - if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled) - uart_handle_cts_change(port, - !gpio_get_value(sirfport->cts_gpio)); - spin_unlock(&port->lock); - return IRQ_HANDLED; -} - -static void sirfsoc_uart_enable_ms(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - - if (!sirfport->hw_flow_ctrl) - return; - sirfport->ms_enabled = true; - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { - wr_regl(port, ureg->sirfsoc_afc_ctrl, - rd_regl(port, ureg->sirfsoc_afc_ctrl) | - SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN | - SIRFUART_AFC_CTRL_RX_THD); - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) - | uint_en->sirfsoc_cts_en); - else - wr_regl(port, ureg->sirfsoc_int_en_reg, - uint_en->sirfsoc_cts_en); - } else - enable_irq(gpio_to_irq(sirfport->cts_gpio)); -} - -static void sirfsoc_uart_break_ctl(struct uart_port *port, int break_state) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { - unsigned long ulcon = rd_regl(port, ureg->sirfsoc_line_ctrl); - if (break_state) - ulcon |= SIRFUART_SET_BREAK; - else - ulcon &= ~SIRFUART_SET_BREAK; - wr_regl(port, ureg->sirfsoc_line_ctrl, ulcon); - } -} - -static unsigned int -sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; - unsigned int ch, rx_count = 0; - struct tty_struct *tty; - tty = tty_port_tty_get(&port->state->port); - if (!tty) - return -ENODEV; - while (!(rd_regl(port, ureg->sirfsoc_rx_fifo_status) & - ufifo_st->ff_empty(port))) { - ch = rd_regl(port, ureg->sirfsoc_rx_fifo_data) | - SIRFUART_DUMMY_READ; - if (unlikely(uart_handle_sysrq_char(port, ch))) - continue; - uart_insert_char(port, 0, 0, ch, TTY_NORMAL); - rx_count++; - if (rx_count >= max_rx_count) - break; - } - - port->icount.rx += rx_count; - - return rx_count; -} - -static unsigned int -sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count) -{ - struct uart_port *port = &sirfport->port; - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; - struct circ_buf *xmit = &port->state->xmit; - unsigned int num_tx = 0; - while (!uart_circ_empty(xmit) && - !(rd_regl(port, ureg->sirfsoc_tx_fifo_status) & - ufifo_st->ff_full(port)) && - count--) { - wr_regl(port, ureg->sirfsoc_tx_fifo_data, - xmit->buf[xmit->tail]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - port->icount.tx++; - num_tx++; - } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - return num_tx; -} - -static void sirfsoc_uart_tx_dma_complete_callback(void *param) -{ - struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param; - struct uart_port *port = &sirfport->port; - struct circ_buf *xmit = &port->state->xmit; - unsigned long flags; - - spin_lock_irqsave(&port->lock, flags); - xmit->tail = (xmit->tail + sirfport->transfer_size) & - (UART_XMIT_SIZE - 1); - port->icount.tx += sirfport->transfer_size; - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - if (sirfport->tx_dma_addr) - dma_unmap_single(port->dev, sirfport->tx_dma_addr, - sirfport->transfer_size, DMA_TO_DEVICE); - sirfport->tx_dma_state = TX_DMA_IDLE; - sirfsoc_uart_tx_with_dma(sirfport); - spin_unlock_irqrestore(&port->lock, flags); -} - -static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id) -{ - unsigned long intr_status; - unsigned long cts_status; - unsigned long flag = TTY_NORMAL; - struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id; - struct uart_port *port = &sirfport->port; - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; - struct sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - struct uart_state *state = port->state; - struct circ_buf *xmit = &port->state->xmit; - spin_lock(&port->lock); - intr_status = rd_regl(port, ureg->sirfsoc_int_st_reg); - wr_regl(port, ureg->sirfsoc_int_st_reg, intr_status); - intr_status &= rd_regl(port, ureg->sirfsoc_int_en_reg); - if (unlikely(intr_status & (SIRFUART_ERR_INT_STAT(uint_st, - sirfport->uart_reg->uart_type)))) { - if (intr_status & uint_st->sirfsoc_rxd_brk) { - port->icount.brk++; - if (uart_handle_break(port)) - goto recv_char; - } - if (intr_status & uint_st->sirfsoc_rx_oflow) { - port->icount.overrun++; - flag = TTY_OVERRUN; - } - if (intr_status & uint_st->sirfsoc_frm_err) { - port->icount.frame++; - flag = TTY_FRAME; - } - if (intr_status & uint_st->sirfsoc_parity_err) { - port->icount.parity++; - flag = TTY_PARITY; - } - wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET); - wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0); - wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START); - intr_status &= port->read_status_mask; - uart_insert_char(port, intr_status, - uint_en->sirfsoc_rx_oflow_en, 0, flag); - } -recv_char: - if ((sirfport->uart_reg->uart_type == SIRF_REAL_UART) && - (intr_status & SIRFUART_CTS_INT_ST(uint_st)) && - !sirfport->tx_dma_state) { - cts_status = rd_regl(port, ureg->sirfsoc_afc_ctrl) & - SIRFUART_AFC_CTS_STATUS; - if (cts_status != 0) - cts_status = 0; - else - cts_status = 1; - uart_handle_cts_change(port, cts_status); - wake_up_interruptible(&state->port.delta_msr_wait); - } - if (!sirfport->rx_dma_chan && - (intr_status & SIRFUART_RX_IO_INT_ST(uint_st))) { - /* - * chip will trigger continuous RX_TIMEOUT interrupt - * in RXFIFO empty and not trigger if RXFIFO recevice - * data in limit time, original method use RX_TIMEOUT - * will trigger lots of useless interrupt in RXFIFO - * empty.RXFIFO received one byte will trigger RX_DONE - * interrupt.use RX_DONE to wait for data received - * into RXFIFO, use RX_THD/RX_FULL for lots data receive - * and use RX_TIMEOUT for the last left data. - */ - if (intr_status & uint_st->sirfsoc_rx_done) { - if (!sirfport->is_atlas7) { - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) - & ~(uint_en->sirfsoc_rx_done_en)); - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) - | (uint_en->sirfsoc_rx_timeout_en)); - } else { - wr_regl(port, ureg->sirfsoc_int_en_clr_reg, - uint_en->sirfsoc_rx_done_en); - wr_regl(port, ureg->sirfsoc_int_en_reg, - uint_en->sirfsoc_rx_timeout_en); - } - } else { - if (intr_status & uint_st->sirfsoc_rx_timeout) { - if (!sirfport->is_atlas7) { - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) - & ~(uint_en->sirfsoc_rx_timeout_en)); - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) - | (uint_en->sirfsoc_rx_done_en)); - } else { - wr_regl(port, - ureg->sirfsoc_int_en_clr_reg, - uint_en->sirfsoc_rx_timeout_en); - wr_regl(port, ureg->sirfsoc_int_en_reg, - uint_en->sirfsoc_rx_done_en); - } - } - sirfsoc_uart_pio_rx_chars(port, port->fifosize); - } - } - spin_unlock(&port->lock); - tty_flip_buffer_push(&state->port); - spin_lock(&port->lock); - if (intr_status & uint_st->sirfsoc_txfifo_empty) { - if (sirfport->tx_dma_chan) - sirfsoc_uart_tx_with_dma(sirfport); - else { - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - spin_unlock(&port->lock); - return IRQ_HANDLED; - } else { - sirfsoc_uart_pio_tx_chars(sirfport, - port->fifosize); - if ((uart_circ_empty(xmit)) && - (rd_regl(port, ureg->sirfsoc_tx_fifo_status) & - ufifo_st->ff_empty(port))) - sirfsoc_uart_stop_tx(port); - } - } - } - spin_unlock(&port->lock); - - return IRQ_HANDLED; -} - -static void sirfsoc_uart_rx_dma_complete_callback(void *param) -{ -} - -/* submit rx dma task into dmaengine */ -static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & - ~SIRFUART_IO_MODE); - sirfport->rx_dma_items.xmit.tail = - sirfport->rx_dma_items.xmit.head = 0; - sirfport->rx_dma_items.desc = - dmaengine_prep_dma_cyclic(sirfport->rx_dma_chan, - sirfport->rx_dma_items.dma_addr, SIRFSOC_RX_DMA_BUF_SIZE, - SIRFSOC_RX_DMA_BUF_SIZE / 2, - DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); - if (IS_ERR_OR_NULL(sirfport->rx_dma_items.desc)) { - dev_err(port->dev, "DMA slave single fail\n"); - return; - } - sirfport->rx_dma_items.desc->callback = - sirfsoc_uart_rx_dma_complete_callback; - sirfport->rx_dma_items.desc->callback_param = sirfport; - sirfport->rx_dma_items.cookie = - dmaengine_submit(sirfport->rx_dma_items.desc); - dma_async_issue_pending(sirfport->rx_dma_chan); - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) | - SIRFUART_RX_DMA_INT_EN(uint_en, - sirfport->uart_reg->uart_type)); - else - wr_regl(port, ureg->sirfsoc_int_en_reg, - SIRFUART_RX_DMA_INT_EN(uint_en, - sirfport->uart_reg->uart_type)); -} - -static unsigned int -sirfsoc_usp_calc_sample_div(unsigned long set_rate, - unsigned long ioclk_rate, unsigned long *sample_reg) -{ - unsigned long min_delta = ~0UL; - unsigned short sample_div; - unsigned long ioclk_div = 0; - unsigned long temp_delta; - - for (sample_div = SIRF_USP_MIN_SAMPLE_DIV; - sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) { - temp_delta = ioclk_rate - - (ioclk_rate + (set_rate * sample_div) / 2) - / (set_rate * sample_div) * set_rate * sample_div; - - temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta; - if (temp_delta < min_delta) { - ioclk_div = (2 * ioclk_rate / - (set_rate * sample_div) + 1) / 2 - 1; - if (ioclk_div > SIRF_IOCLK_DIV_MAX) - continue; - min_delta = temp_delta; - *sample_reg = sample_div; - if (!temp_delta) - break; - } - } - return ioclk_div; -} - -static unsigned int -sirfsoc_uart_calc_sample_div(unsigned long baud_rate, - unsigned long ioclk_rate, unsigned long *set_baud) -{ - unsigned long min_delta = ~0UL; - unsigned short sample_div; - unsigned int regv = 0; - unsigned long ioclk_div; - unsigned long baud_tmp; - int temp_delta; - - for (sample_div = SIRF_MIN_SAMPLE_DIV; - sample_div <= SIRF_MAX_SAMPLE_DIV; sample_div++) { - ioclk_div = (ioclk_rate / (baud_rate * (sample_div + 1))) - 1; - if (ioclk_div > SIRF_IOCLK_DIV_MAX) - continue; - baud_tmp = ioclk_rate / ((ioclk_div + 1) * (sample_div + 1)); - temp_delta = baud_tmp - baud_rate; - temp_delta = (temp_delta > 0) ? temp_delta : -temp_delta; - if (temp_delta < min_delta) { - regv = regv & (~SIRF_IOCLK_DIV_MASK); - regv = regv | ioclk_div; - regv = regv & (~SIRF_SAMPLE_DIV_MASK); - regv = regv | (sample_div << SIRF_SAMPLE_DIV_SHIFT); - min_delta = temp_delta; - *set_baud = baud_tmp; - } - } - return regv; -} - -static void sirfsoc_uart_set_termios(struct uart_port *port, - struct ktermios *termios, - struct ktermios *old) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - unsigned long config_reg = 0; - unsigned long baud_rate; - unsigned long set_baud; - unsigned long flags; - unsigned long ic; - unsigned int clk_div_reg = 0; - unsigned long txfifo_op_reg, ioclk_rate; - unsigned long rx_time_out; - int threshold_div; - u32 data_bit_len, stop_bit_len, len_val; - unsigned long sample_div_reg = 0xf; - ioclk_rate = port->uartclk; - - switch (termios->c_cflag & CSIZE) { - default: - case CS8: - data_bit_len = 8; - config_reg |= SIRFUART_DATA_BIT_LEN_8; - break; - case CS7: - data_bit_len = 7; - config_reg |= SIRFUART_DATA_BIT_LEN_7; - break; - case CS6: - data_bit_len = 6; - config_reg |= SIRFUART_DATA_BIT_LEN_6; - break; - case CS5: - data_bit_len = 5; - config_reg |= SIRFUART_DATA_BIT_LEN_5; - break; - } - if (termios->c_cflag & CSTOPB) { - config_reg |= SIRFUART_STOP_BIT_LEN_2; - stop_bit_len = 2; - } else - stop_bit_len = 1; - - spin_lock_irqsave(&port->lock, flags); - port->read_status_mask = uint_en->sirfsoc_rx_oflow_en; - port->ignore_status_mask = 0; - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { - if (termios->c_iflag & INPCK) - port->read_status_mask |= uint_en->sirfsoc_frm_err_en | - uint_en->sirfsoc_parity_err_en; - } else { - if (termios->c_iflag & INPCK) - port->read_status_mask |= uint_en->sirfsoc_frm_err_en; - } - if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) - port->read_status_mask |= uint_en->sirfsoc_rxd_brk_en; - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= - uint_en->sirfsoc_frm_err_en | - uint_en->sirfsoc_parity_err_en; - if (termios->c_cflag & PARENB) { - if (termios->c_cflag & CMSPAR) { - if (termios->c_cflag & PARODD) - config_reg |= SIRFUART_STICK_BIT_MARK; - else - config_reg |= SIRFUART_STICK_BIT_SPACE; - } else { - if (termios->c_cflag & PARODD) - config_reg |= SIRFUART_STICK_BIT_ODD; - else - config_reg |= SIRFUART_STICK_BIT_EVEN; - } - } - } else { - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= - uint_en->sirfsoc_frm_err_en; - if (termios->c_cflag & PARENB) - dev_warn(port->dev, - "USP-UART not support parity err\n"); - } - if (termios->c_iflag & IGNBRK) { - port->ignore_status_mask |= - uint_en->sirfsoc_rxd_brk_en; - if (termios->c_iflag & IGNPAR) - port->ignore_status_mask |= - uint_en->sirfsoc_rx_oflow_en; - } - if ((termios->c_cflag & CREAD) == 0) - port->ignore_status_mask |= SIRFUART_DUMMY_READ; - /* Hardware Flow Control Settings */ - if (UART_ENABLE_MS(port, termios->c_cflag)) { - if (!sirfport->ms_enabled) - sirfsoc_uart_enable_ms(port); - } else { - if (sirfport->ms_enabled) - sirfsoc_uart_disable_ms(port); - } - baud_rate = uart_get_baud_rate(port, termios, old, 0, 4000000); - if (ioclk_rate == 150000000) { - for (ic = 0; ic < SIRF_BAUD_RATE_SUPPORT_NR; ic++) - if (baud_rate == baudrate_to_regv[ic].baud_rate) - clk_div_reg = baudrate_to_regv[ic].reg_val; - } - set_baud = baud_rate; - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { - if (unlikely(clk_div_reg == 0)) - clk_div_reg = sirfsoc_uart_calc_sample_div(baud_rate, - ioclk_rate, &set_baud); - wr_regl(port, ureg->sirfsoc_divisor, clk_div_reg); - } else { - clk_div_reg = sirfsoc_usp_calc_sample_div(baud_rate, - ioclk_rate, &sample_div_reg); - sample_div_reg--; - set_baud = ((ioclk_rate / (clk_div_reg+1) - 1) / - (sample_div_reg + 1)); - /* setting usp mode 2 */ - len_val = ((1 << SIRFSOC_USP_MODE2_RXD_DELAY_OFFSET) | - (1 << SIRFSOC_USP_MODE2_TXD_DELAY_OFFSET)); - len_val |= ((clk_div_reg & SIRFSOC_USP_MODE2_CLK_DIVISOR_MASK) - << SIRFSOC_USP_MODE2_CLK_DIVISOR_OFFSET); - wr_regl(port, ureg->sirfsoc_mode2, len_val); - } - if (tty_termios_baud_rate(termios)) - tty_termios_encode_baud_rate(termios, set_baud, set_baud); - /* set receive timeout && data bits len */ - rx_time_out = SIRFSOC_UART_RX_TIMEOUT(set_baud, 20000); - rx_time_out = SIRFUART_RECV_TIMEOUT_VALUE(rx_time_out); - txfifo_op_reg = rd_regl(port, ureg->sirfsoc_tx_fifo_op); - wr_regl(port, ureg->sirfsoc_tx_fifo_op, - (txfifo_op_reg & ~SIRFUART_FIFO_START)); - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { - config_reg |= SIRFUART_UART_RECV_TIMEOUT(rx_time_out); - wr_regl(port, ureg->sirfsoc_line_ctrl, config_reg); - } else { - /*tx frame ctrl*/ - len_val = (data_bit_len - 1) << SIRFSOC_USP_TX_DATA_LEN_OFFSET; - len_val |= (data_bit_len + 1 + stop_bit_len - 1) << - SIRFSOC_USP_TX_FRAME_LEN_OFFSET; - len_val |= ((data_bit_len - 1) << - SIRFSOC_USP_TX_SHIFTER_LEN_OFFSET); - len_val |= (((clk_div_reg & 0xc00) >> 10) << - SIRFSOC_USP_TX_CLK_DIVISOR_OFFSET); - wr_regl(port, ureg->sirfsoc_tx_frame_ctrl, len_val); - /*rx frame ctrl*/ - len_val = (data_bit_len - 1) << SIRFSOC_USP_RX_DATA_LEN_OFFSET; - len_val |= (data_bit_len + 1 + stop_bit_len - 1) << - SIRFSOC_USP_RX_FRAME_LEN_OFFSET; - len_val |= (data_bit_len - 1) << - SIRFSOC_USP_RX_SHIFTER_LEN_OFFSET; - len_val |= (((clk_div_reg & 0xf000) >> 12) << - SIRFSOC_USP_RX_CLK_DIVISOR_OFFSET); - wr_regl(port, ureg->sirfsoc_rx_frame_ctrl, len_val); - /*async param*/ - wr_regl(port, ureg->sirfsoc_async_param_reg, - (SIRFUART_USP_RECV_TIMEOUT(rx_time_out)) | - (sample_div_reg & SIRFSOC_USP_ASYNC_DIV2_MASK) << - SIRFSOC_USP_ASYNC_DIV2_OFFSET); - } - if (sirfport->tx_dma_chan) - wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_DMA_MODE); - else - wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_IO_MODE); - if (sirfport->rx_dma_chan) - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & - ~SIRFUART_IO_MODE); - else - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | - SIRFUART_IO_MODE); - sirfport->rx_period_time = 20000000; - /* Reset Rx/Tx FIFO Threshold level for proper baudrate */ - if (set_baud < 1000000) - threshold_div = 1; - else - threshold_div = 2; - wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl, - SIRFUART_FIFO_THD(port) / threshold_div); - wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, - SIRFUART_FIFO_THD(port) / threshold_div); - txfifo_op_reg |= SIRFUART_FIFO_START; - wr_regl(port, ureg->sirfsoc_tx_fifo_op, txfifo_op_reg); - uart_update_timeout(port, termios->c_cflag, set_baud); - wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_TX_EN | SIRFUART_RX_EN); - spin_unlock_irqrestore(&port->lock, flags); -} - -static void sirfsoc_uart_pm(struct uart_port *port, unsigned int state, - unsigned int oldstate) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - if (!state) - clk_prepare_enable(sirfport->clk); - else - clk_disable_unprepare(sirfport->clk); -} - -static int sirfsoc_uart_startup(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - unsigned int index = port->line; - int ret; - irq_modify_status(port->irq, IRQ_NOREQUEST, IRQ_NOAUTOEN); - ret = request_irq(port->irq, - sirfsoc_uart_isr, - 0, - SIRFUART_PORT_NAME, - sirfport); - if (ret != 0) { - dev_err(port->dev, "UART%d request IRQ line (%d) failed.\n", - index, port->irq); - goto irq_err; - } - /* initial hardware settings */ - wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_tx_dma_io_ctrl) | - SIRFUART_IO_MODE); - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | - SIRFUART_IO_MODE); - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & - ~SIRFUART_RX_DMA_FLUSH); - wr_regl(port, ureg->sirfsoc_tx_dma_io_len, 0); - wr_regl(port, ureg->sirfsoc_rx_dma_io_len, 0); - wr_regl(port, ureg->sirfsoc_tx_rx_en, SIRFUART_RX_EN | SIRFUART_TX_EN); - if (sirfport->uart_reg->uart_type == SIRF_USP_UART) - wr_regl(port, ureg->sirfsoc_mode1, - SIRFSOC_USP_ENDIAN_CTRL_LSBF | - SIRFSOC_USP_EN); - wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_RESET); - wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET); - wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0); - wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl, SIRFUART_FIFO_THD(port)); - wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, SIRFUART_FIFO_THD(port)); - if (sirfport->rx_dma_chan) - wr_regl(port, ureg->sirfsoc_rx_fifo_level_chk, - SIRFUART_RX_FIFO_CHK_SC(port->line, 0x1) | - SIRFUART_RX_FIFO_CHK_LC(port->line, 0x2) | - SIRFUART_RX_FIFO_CHK_HC(port->line, 0x4)); - if (sirfport->tx_dma_chan) { - sirfport->tx_dma_state = TX_DMA_IDLE; - wr_regl(port, ureg->sirfsoc_tx_fifo_level_chk, - SIRFUART_TX_FIFO_CHK_SC(port->line, 0x1b) | - SIRFUART_TX_FIFO_CHK_LC(port->line, 0xe) | - SIRFUART_TX_FIFO_CHK_HC(port->line, 0x4)); - } - sirfport->ms_enabled = false; - if (sirfport->uart_reg->uart_type == SIRF_USP_UART && - sirfport->hw_flow_ctrl) { - irq_modify_status(gpio_to_irq(sirfport->cts_gpio), - IRQ_NOREQUEST, IRQ_NOAUTOEN); - ret = request_irq(gpio_to_irq(sirfport->cts_gpio), - sirfsoc_uart_usp_cts_handler, IRQF_TRIGGER_FALLING | - IRQF_TRIGGER_RISING, "usp_cts_irq", sirfport); - if (ret != 0) { - dev_err(port->dev, "UART-USP:request gpio irq fail\n"); - goto init_rx_err; - } - } - if (sirfport->uart_reg->uart_type == SIRF_REAL_UART && - sirfport->rx_dma_chan) - wr_regl(port, ureg->sirfsoc_swh_dma_io, - SIRFUART_CLEAR_RX_ADDR_EN); - if (sirfport->uart_reg->uart_type == SIRF_USP_UART && - sirfport->rx_dma_chan) - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | - SIRFSOC_USP_FRADDR_CLR_EN); - if (sirfport->rx_dma_chan && !sirfport->is_hrt_enabled) { - sirfport->is_hrt_enabled = true; - sirfport->rx_period_time = 20000000; - sirfport->rx_last_pos = -1; - sirfport->pio_fetch_cnt = 0; - sirfport->rx_dma_items.xmit.tail = - sirfport->rx_dma_items.xmit.head = 0; - hrtimer_start(&sirfport->hrt, - ns_to_ktime(sirfport->rx_period_time), - HRTIMER_MODE_REL); - } - wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START); - if (sirfport->rx_dma_chan) - sirfsoc_uart_start_next_rx_dma(port); - else { - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, - rd_regl(port, ureg->sirfsoc_int_en_reg) | - SIRFUART_RX_IO_INT_EN(uint_en, - sirfport->uart_reg->uart_type)); - else - wr_regl(port, ureg->sirfsoc_int_en_reg, - SIRFUART_RX_IO_INT_EN(uint_en, - sirfport->uart_reg->uart_type)); - } - enable_irq(port->irq); - - return 0; -init_rx_err: - free_irq(port->irq, sirfport); -irq_err: - return ret; -} - -static void sirfsoc_uart_shutdown(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct circ_buf *xmit; - - xmit = &sirfport->rx_dma_items.xmit; - if (!sirfport->is_atlas7) - wr_regl(port, ureg->sirfsoc_int_en_reg, 0); - else - wr_regl(port, ureg->sirfsoc_int_en_clr_reg, ~0UL); - - free_irq(port->irq, sirfport); - if (sirfport->ms_enabled) - sirfsoc_uart_disable_ms(port); - if (sirfport->uart_reg->uart_type == SIRF_USP_UART && - sirfport->hw_flow_ctrl) { - gpio_set_value(sirfport->rts_gpio, 1); - free_irq(gpio_to_irq(sirfport->cts_gpio), sirfport); - } - if (sirfport->tx_dma_chan) - sirfport->tx_dma_state = TX_DMA_IDLE; - if (sirfport->rx_dma_chan && sirfport->is_hrt_enabled) { - while (((rd_regl(port, ureg->sirfsoc_rx_fifo_status) & - SIRFUART_RX_FIFO_MASK) > sirfport->pio_fetch_cnt) && - !CIRC_CNT(xmit->head, xmit->tail, - SIRFSOC_RX_DMA_BUF_SIZE)) - ; - sirfport->is_hrt_enabled = false; - hrtimer_cancel(&sirfport->hrt); - } -} - -static const char *sirfsoc_uart_type(struct uart_port *port) -{ - return port->type == SIRFSOC_PORT_TYPE ? SIRFUART_PORT_NAME : NULL; -} - -static int sirfsoc_uart_request_port(struct uart_port *port) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_uart_param *uart_param = &sirfport->uart_reg->uart_param; - void *ret; - ret = request_mem_region(port->mapbase, - SIRFUART_MAP_SIZE, uart_param->port_name); - return ret ? 0 : -EBUSY; -} - -static void sirfsoc_uart_release_port(struct uart_port *port) -{ - release_mem_region(port->mapbase, SIRFUART_MAP_SIZE); -} - -static void sirfsoc_uart_config_port(struct uart_port *port, int flags) -{ - if (flags & UART_CONFIG_TYPE) { - port->type = SIRFSOC_PORT_TYPE; - sirfsoc_uart_request_port(port); - } -} - -static const struct uart_ops sirfsoc_uart_ops = { - .tx_empty = sirfsoc_uart_tx_empty, - .get_mctrl = sirfsoc_uart_get_mctrl, - .set_mctrl = sirfsoc_uart_set_mctrl, - .stop_tx = sirfsoc_uart_stop_tx, - .start_tx = sirfsoc_uart_start_tx, - .stop_rx = sirfsoc_uart_stop_rx, - .enable_ms = sirfsoc_uart_enable_ms, - .break_ctl = sirfsoc_uart_break_ctl, - .startup = sirfsoc_uart_startup, - .shutdown = sirfsoc_uart_shutdown, - .set_termios = sirfsoc_uart_set_termios, - .pm = sirfsoc_uart_pm, - .type = sirfsoc_uart_type, - .release_port = sirfsoc_uart_release_port, - .request_port = sirfsoc_uart_request_port, - .config_port = sirfsoc_uart_config_port, -}; - -#ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE -static int __init -sirfsoc_uart_console_setup(struct console *co, char *options) -{ - unsigned int baud = 115200; - unsigned int bits = 8; - unsigned int parity = 'n'; - unsigned int flow = 'n'; - struct sirfsoc_uart_port *sirfport; - struct sirfsoc_register *ureg; - if (co->index < 0 || co->index >= SIRFSOC_UART_NR) - co->index = 1; - sirfport = sirf_ports[co->index]; - if (!sirfport) - return -ENODEV; - ureg = &sirfport->uart_reg->uart_reg; - if (!sirfport->port.mapbase) - return -ENODEV; - - /* enable usp in mode1 register */ - if (sirfport->uart_reg->uart_type == SIRF_USP_UART) - wr_regl(&sirfport->port, ureg->sirfsoc_mode1, SIRFSOC_USP_EN | - SIRFSOC_USP_ENDIAN_CTRL_LSBF); - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - sirfport->port.cons = co; - - /* default console tx/rx transfer using io mode */ - sirfport->rx_dma_chan = NULL; - sirfport->tx_dma_chan = NULL; - return uart_set_options(&sirfport->port, co, baud, parity, bits, flow); -} - -static void sirfsoc_uart_console_putchar(struct uart_port *port, int ch) -{ - struct sirfsoc_uart_port *sirfport = to_sirfport(port); - struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - struct sirfsoc_fifo_status *ufifo_st = &sirfport->uart_reg->fifo_status; - while (rd_regl(port, ureg->sirfsoc_tx_fifo_status) & - ufifo_st->ff_full(port)) - cpu_relax(); - wr_regl(port, ureg->sirfsoc_tx_fifo_data, ch); -} - -static void sirfsoc_uart_console_write(struct console *co, const char *s, - unsigned int count) -{ - struct sirfsoc_uart_port *sirfport = sirf_ports[co->index]; - - uart_console_write(&sirfport->port, s, count, - sirfsoc_uart_console_putchar); -} - -static struct console sirfsoc_uart_console = { - .name = SIRFSOC_UART_NAME, - .device = uart_console_device, - .flags = CON_PRINTBUFFER, - .index = -1, - .write = sirfsoc_uart_console_write, - .setup = sirfsoc_uart_console_setup, - .data = &sirfsoc_uart_drv, -}; - -static int __init sirfsoc_uart_console_init(void) -{ - register_console(&sirfsoc_uart_console); - return 0; -} -console_initcall(sirfsoc_uart_console_init); -#endif - -static struct uart_driver sirfsoc_uart_drv = { - .owner = THIS_MODULE, - .driver_name = SIRFUART_PORT_NAME, - .nr = SIRFSOC_UART_NR, - .dev_name = SIRFSOC_UART_NAME, - .major = SIRFSOC_UART_MAJOR, - .minor = SIRFSOC_UART_MINOR, -#ifdef CONFIG_SERIAL_SIRFSOC_CONSOLE - .cons = &sirfsoc_uart_console, -#else - .cons = NULL, -#endif -}; - -static enum hrtimer_restart - sirfsoc_uart_rx_dma_hrtimer_callback(struct hrtimer *hrt) -{ - struct sirfsoc_uart_port *sirfport; - struct uart_port *port; - int count, inserted; - struct dma_tx_state tx_state; - struct tty_struct *tty; - struct sirfsoc_register *ureg; - struct circ_buf *xmit; - struct sirfsoc_fifo_status *ufifo_st; - int max_pio_cnt; - - sirfport = container_of(hrt, struct sirfsoc_uart_port, hrt); - port = &sirfport->port; - inserted = 0; - tty = port->state->port.tty; - ureg = &sirfport->uart_reg->uart_reg; - xmit = &sirfport->rx_dma_items.xmit; - ufifo_st = &sirfport->uart_reg->fifo_status; - - dmaengine_tx_status(sirfport->rx_dma_chan, - sirfport->rx_dma_items.cookie, &tx_state); - if (SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue != - sirfport->rx_last_pos) { - xmit->head = SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue; - sirfport->rx_last_pos = xmit->head; - sirfport->pio_fetch_cnt = 0; - } - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, - SIRFSOC_RX_DMA_BUF_SIZE); - while (count > 0) { - inserted = tty_insert_flip_string(tty->port, - (const unsigned char *)&xmit->buf[xmit->tail], count); - if (!inserted) - goto next_hrt; - port->icount.rx += inserted; - xmit->tail = (xmit->tail + inserted) & - (SIRFSOC_RX_DMA_BUF_SIZE - 1); - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, - SIRFSOC_RX_DMA_BUF_SIZE); - tty_flip_buffer_push(tty->port); - } - /* - * if RX DMA buffer data have all push into tty buffer, and there is - * only little data(less than a dma transfer unit) left in rxfifo, - * fetch it out in pio mode and switch back to dma immediately - */ - if (!inserted && !count && - ((rd_regl(port, ureg->sirfsoc_rx_fifo_status) & - SIRFUART_RX_FIFO_MASK) > sirfport->pio_fetch_cnt)) { - dmaengine_pause(sirfport->rx_dma_chan); - /* switch to pio mode */ - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | - SIRFUART_IO_MODE); - /* - * UART controller SWH_DMA_IO register have CLEAR_RX_ADDR_EN - * When found changing I/O to DMA mode, it clears - * two low bits of read point; - * USP have similar FRADDR_CLR_EN bit in USP_RX_DMA_IO_CTRL. - * Fetch data out from rxfifo into DMA buffer in PIO mode, - * while switch back to DMA mode, the data fetched will override - * by DMA, as hardware have a strange behaviour: - * after switch back to DMA mode, check rxfifo status it will - * be the number PIO fetched, so record the fetched data count - * to avoid the repeated fetch - */ - max_pio_cnt = 3; - while (!(rd_regl(port, ureg->sirfsoc_rx_fifo_status) & - ufifo_st->ff_empty(port)) && max_pio_cnt--) { - xmit->buf[xmit->head] = - rd_regl(port, ureg->sirfsoc_rx_fifo_data); - xmit->head = (xmit->head + 1) & - (SIRFSOC_RX_DMA_BUF_SIZE - 1); - sirfport->pio_fetch_cnt++; - } - /* switch back to dma mode */ - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, - rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & - ~SIRFUART_IO_MODE); - dmaengine_resume(sirfport->rx_dma_chan); - } -next_hrt: - hrtimer_forward_now(hrt, ns_to_ktime(sirfport->rx_period_time)); - return HRTIMER_RESTART; -} - -static const struct of_device_id sirfsoc_uart_ids[] = { - { .compatible = "sirf,prima2-uart", .data = &sirfsoc_uart,}, - { .compatible = "sirf,atlas7-uart", .data = &sirfsoc_uart}, - { .compatible = "sirf,prima2-usp-uart", .data = &sirfsoc_usp}, - { .compatible = "sirf,atlas7-usp-uart", .data = &sirfsoc_usp}, - {} -}; -MODULE_DEVICE_TABLE(of, sirfsoc_uart_ids); - -static int sirfsoc_uart_probe(struct platform_device *pdev) -{ - struct device_node *np = pdev->dev.of_node; - struct sirfsoc_uart_port *sirfport; - struct uart_port *port; - struct resource *res; - int ret; - struct dma_slave_config slv_cfg = { - .src_maxburst = 1, - }; - struct dma_slave_config tx_slv_cfg = { - .dst_maxburst = 2, - }; - const struct of_device_id *match; - - match = of_match_node(sirfsoc_uart_ids, np); - sirfport = devm_kzalloc(&pdev->dev, sizeof(*sirfport), GFP_KERNEL); - if (!sirfport) { - ret = -ENOMEM; - goto err; - } - sirfport->port.line = of_alias_get_id(np, "serial"); - if (sirfport->port.line >= ARRAY_SIZE(sirf_ports)) { - dev_err(&pdev->dev, "serial%d out of range\n", - sirfport->port.line); - return -EINVAL; - } - sirf_ports[sirfport->port.line] = sirfport; - sirfport->port.iotype = UPIO_MEM; - sirfport->port.flags = UPF_BOOT_AUTOCONF; - port = &sirfport->port; - port->dev = &pdev->dev; - port->private_data = sirfport; - sirfport->uart_reg = (struct sirfsoc_uart_register *)match->data; - - sirfport->hw_flow_ctrl = - of_property_read_bool(np, "uart-has-rtscts") || - of_property_read_bool(np, "sirf,uart-has-rtscts") /* deprecated */; - if (of_device_is_compatible(np, "sirf,prima2-uart") || - of_device_is_compatible(np, "sirf,atlas7-uart")) - sirfport->uart_reg->uart_type = SIRF_REAL_UART; - if (of_device_is_compatible(np, "sirf,prima2-usp-uart") || - of_device_is_compatible(np, "sirf,atlas7-usp-uart")) { - sirfport->uart_reg->uart_type = SIRF_USP_UART; - if (!sirfport->hw_flow_ctrl) - goto usp_no_flow_control; - if (of_find_property(np, "cts-gpios", NULL)) - sirfport->cts_gpio = - of_get_named_gpio(np, "cts-gpios", 0); - else - sirfport->cts_gpio = -1; - if (of_find_property(np, "rts-gpios", NULL)) - sirfport->rts_gpio = - of_get_named_gpio(np, "rts-gpios", 0); - else - sirfport->rts_gpio = -1; - - if ((!gpio_is_valid(sirfport->cts_gpio) || - !gpio_is_valid(sirfport->rts_gpio))) { - ret = -EINVAL; - dev_err(&pdev->dev, - "Usp flow control must have cts and rts gpio"); - goto err; - } - ret = devm_gpio_request(&pdev->dev, sirfport->cts_gpio, - "usp-cts-gpio"); - if (ret) { - dev_err(&pdev->dev, "Unable request cts gpio"); - goto err; - } - gpio_direction_input(sirfport->cts_gpio); - ret = devm_gpio_request(&pdev->dev, sirfport->rts_gpio, - "usp-rts-gpio"); - if (ret) { - dev_err(&pdev->dev, "Unable request rts gpio"); - goto err; - } - gpio_direction_output(sirfport->rts_gpio, 1); - } -usp_no_flow_control: - if (of_device_is_compatible(np, "sirf,atlas7-uart") || - of_device_is_compatible(np, "sirf,atlas7-usp-uart")) - sirfport->is_atlas7 = true; - - if (of_property_read_u32(np, "fifosize", &port->fifosize)) { - dev_err(&pdev->dev, - "Unable to find fifosize in uart node.\n"); - ret = -EFAULT; - goto err; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res == NULL) { - dev_err(&pdev->dev, "Insufficient resources.\n"); - ret = -EFAULT; - goto err; - } - port->mapbase = res->start; - port->membase = devm_ioremap(&pdev->dev, - res->start, resource_size(res)); - if (!port->membase) { - dev_err(&pdev->dev, "Cannot remap resource.\n"); - ret = -ENOMEM; - goto err; - } - res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (res == NULL) { - dev_err(&pdev->dev, "Insufficient resources.\n"); - ret = -EFAULT; - goto err; - } - port->irq = res->start; - - sirfport->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(sirfport->clk)) { - ret = PTR_ERR(sirfport->clk); - goto err; - } - port->uartclk = clk_get_rate(sirfport->clk); - - port->ops = &sirfsoc_uart_ops; - spin_lock_init(&port->lock); - - platform_set_drvdata(pdev, sirfport); - ret = uart_add_one_port(&sirfsoc_uart_drv, port); - if (ret != 0) { - dev_err(&pdev->dev, "Cannot add UART port(%d).\n", pdev->id); - goto err; - } - - sirfport->rx_dma_chan = dma_request_slave_channel(port->dev, "rx"); - sirfport->rx_dma_items.xmit.buf = - dma_alloc_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE, - &sirfport->rx_dma_items.dma_addr, GFP_KERNEL); - if (!sirfport->rx_dma_items.xmit.buf) { - dev_err(port->dev, "Uart alloc bufa failed\n"); - ret = -ENOMEM; - goto alloc_coherent_err; - } - sirfport->rx_dma_items.xmit.head = - sirfport->rx_dma_items.xmit.tail = 0; - if (sirfport->rx_dma_chan) - dmaengine_slave_config(sirfport->rx_dma_chan, &slv_cfg); - sirfport->tx_dma_chan = dma_request_slave_channel(port->dev, "tx"); - if (sirfport->tx_dma_chan) - dmaengine_slave_config(sirfport->tx_dma_chan, &tx_slv_cfg); - if (sirfport->rx_dma_chan) { - hrtimer_init(&sirfport->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL); - sirfport->hrt.function = sirfsoc_uart_rx_dma_hrtimer_callback; - sirfport->is_hrt_enabled = false; - } - - return 0; -alloc_coherent_err: - dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE, - sirfport->rx_dma_items.xmit.buf, - sirfport->rx_dma_items.dma_addr); - dma_release_channel(sirfport->rx_dma_chan); -err: - return ret; -} - -static int sirfsoc_uart_remove(struct platform_device *pdev) -{ - struct sirfsoc_uart_port *sirfport = platform_get_drvdata(pdev); - struct uart_port *port = &sirfport->port; - uart_remove_one_port(&sirfsoc_uart_drv, port); - if (sirfport->rx_dma_chan) { - dmaengine_terminate_all(sirfport->rx_dma_chan); - dma_release_channel(sirfport->rx_dma_chan); - dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE, - sirfport->rx_dma_items.xmit.buf, - sirfport->rx_dma_items.dma_addr); - } - if (sirfport->tx_dma_chan) { - dmaengine_terminate_all(sirfport->tx_dma_chan); - dma_release_channel(sirfport->tx_dma_chan); - } - return 0; -} - -#ifdef CONFIG_PM_SLEEP -static int -sirfsoc_uart_suspend(struct device *pdev) -{ - struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev); - struct uart_port *port = &sirfport->port; - uart_suspend_port(&sirfsoc_uart_drv, port); - return 0; -} - -static int sirfsoc_uart_resume(struct device *pdev) -{ - struct sirfsoc_uart_port *sirfport = dev_get_drvdata(pdev); - struct uart_port *port = &sirfport->port; - uart_resume_port(&sirfsoc_uart_drv, port); - return 0; -} -#endif - -static const struct dev_pm_ops sirfsoc_uart_pm_ops = { - SET_SYSTEM_SLEEP_PM_OPS(sirfsoc_uart_suspend, sirfsoc_uart_resume) -}; - -static struct platform_driver sirfsoc_uart_driver = { - .probe = sirfsoc_uart_probe, - .remove = sirfsoc_uart_remove, - .driver = { - .name = SIRFUART_PORT_NAME, - .of_match_table = sirfsoc_uart_ids, - .pm = &sirfsoc_uart_pm_ops, - }, -}; - -static int __init sirfsoc_uart_init(void) -{ - int ret = 0; - - ret = uart_register_driver(&sirfsoc_uart_drv); - if (ret) - goto out; - - ret = platform_driver_register(&sirfsoc_uart_driver); - if (ret) - uart_unregister_driver(&sirfsoc_uart_drv); -out: - return ret; -} -module_init(sirfsoc_uart_init); - -static void __exit sirfsoc_uart_exit(void) -{ - platform_driver_unregister(&sirfsoc_uart_driver); - uart_unregister_driver(&sirfsoc_uart_drv); -} -module_exit(sirfsoc_uart_exit); - -MODULE_LICENSE("GPL v2"); -MODULE_AUTHOR("Bin Shi <Bin.Shi@csr.com>, Rong Wang<Rong.Wang@csr.com>"); -MODULE_DESCRIPTION("CSR SiRFprimaII Uart Driver"); |