diff options
Diffstat (limited to 'drivers/tty/serial/sirfsoc_uart.c')
| -rw-r--r-- | drivers/tty/serial/sirfsoc_uart.c | 1195 |
1 files changed, 981 insertions, 214 deletions
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c index 1fd564b8194..61c1ad03db5 100644 --- a/drivers/tty/serial/sirfsoc_uart.c +++ b/drivers/tty/serial/sirfsoc_uart.c @@ -20,9 +20,13 @@ #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 <linux/sirfsoc_dma.h> #include <asm/irq.h> #include <asm/mach/irq.h> -#include <linux/pinctrl/consumer.h> #include "sirfsoc_uart.h" @@ -32,6 +36,9 @@ 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 void sirfsoc_uart_start_next_rx_dma(struct uart_port *port); +static void sirfsoc_uart_rx_dma_complete_callback(void *param); static const struct sirfsoc_baudrate_to_regv baudrate_to_regv[] = { {4000000, 2359296}, {3500000, 1310721}, @@ -89,6 +96,13 @@ static struct sirfsoc_uart_port sirfsoc_uart_ports[SIRFSOC_UART_NR] = { .line = 4, }, }, + [5] = { + .port = { + .iotype = UPIO_MEM, + .flags = UPF_BOOT_AUTOCONF, + .line = 5, + }, + }, }; static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port) @@ -99,21 +113,28 @@ static inline struct sirfsoc_uart_port *to_sirfport(struct uart_port *port) static inline unsigned int sirfsoc_uart_tx_empty(struct uart_port *port) { unsigned long reg; - reg = rd_regl(port, SIRFUART_TX_FIFO_STATUS); - if (reg & SIRFUART_FIFOEMPTY_MASK(port)) - return TIOCSER_TEMT; - else - return 0; + 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->line)) ? TIOCSER_TEMT : 0; } static unsigned int sirfsoc_uart_get_mctrl(struct uart_port *port) { struct sirfsoc_uart_port *sirfport = to_sirfport(port); - if (!(sirfport->ms_enabled)) { + struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; + if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled) goto cts_asserted; - } else if (sirfport->hw_flow_ctrl) { - if (!(rd_regl(port, SIRFUART_AFC_CTRL) & - SIRFUART_CTS_IN_STATUS)) + 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; @@ -127,89 +148,276 @@ cts_asserted: 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 (sirfport->hw_flow_ctrl) { - current_val = rd_regl(port, SIRFUART_AFC_CTRL) & ~0xFF; + + 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, SIRFUART_AFC_CTRL, 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) { - unsigned int regv; - regv = rd_regl(port, SIRFUART_INT_EN); - wr_regl(port, SIRFUART_INT_EN, regv & ~SIRFUART_TX_INT_EN); + 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 (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) { + 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_marco) + 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, SIRFUART_INT_EN_CLR, + uint_en->sirfsoc_txfifo_empty_en); + } + } else { + if (!sirfport->is_marco) + 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, SIRFUART_INT_EN_CLR, + uint_en->sirfsoc_txfifo_empty_en); + } } -void sirfsoc_uart_start_tx(struct uart_port *port) +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_marco) + 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, SIRFUART_INT_EN_CLR, + 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_marco) + 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); - unsigned long regv; - sirfsoc_uart_pio_tx_chars(sirfport, 1); - wr_regl(port, SIRFUART_TX_FIFO_OP, SIRFUART_TX_FIFO_START); - regv = rd_regl(port, SIRFUART_INT_EN); - wr_regl(port, SIRFUART_INT_EN, regv | SIRFUART_TX_INT_EN); + struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; + struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; + if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) + sirfsoc_uart_tx_with_dma(sirfport); + else { + sirfsoc_uart_pio_tx_chars(sirfport, 1); + wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START); + if (!sirfport->is_marco) + 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) { - unsigned long regv; - wr_regl(port, SIRFUART_RX_FIFO_OP, 0); - regv = rd_regl(port, SIRFUART_INT_EN); - wr_regl(port, SIRFUART_INT_EN, regv & ~SIRFUART_RX_IO_INT_EN); + 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 (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) { + if (!sirfport->is_marco) + wr_regl(port, ureg->sirfsoc_int_en_reg, + rd_regl(port, ureg->sirfsoc_int_en_reg) & + ~(SIRFUART_RX_DMA_INT_EN(port, uint_en) | + uint_en->sirfsoc_rx_done_en)); + else + wr_regl(port, SIRFUART_INT_EN_CLR, + SIRFUART_RX_DMA_INT_EN(port, uint_en)| + uint_en->sirfsoc_rx_done_en); + dmaengine_terminate_all(sirfport->rx_dma_chan); + } else { + if (!sirfport->is_marco) + wr_regl(port, ureg->sirfsoc_int_en_reg, + rd_regl(port, ureg->sirfsoc_int_en_reg)& + ~(SIRFUART_RX_IO_INT_EN(port, uint_en))); + else + wr_regl(port, SIRFUART_INT_EN_CLR, + SIRFUART_RX_IO_INT_EN(port, uint_en)); + } } static void sirfsoc_uart_disable_ms(struct uart_port *port) { struct sirfsoc_uart_port *sirfport = to_sirfport(port); - unsigned long reg; - sirfport->ms_enabled = 0; + 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; - reg = rd_regl(port, SIRFUART_AFC_CTRL); - wr_regl(port, SIRFUART_AFC_CTRL, reg & ~0x3FF); - reg = rd_regl(port, SIRFUART_INT_EN); - wr_regl(port, SIRFUART_INT_EN, reg & ~SIRFUART_CTS_INT_EN); + 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_marco) + 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, SIRFUART_INT_EN_CLR, + 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; + if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled) + uart_handle_cts_change(port, + !gpio_get_value(sirfport->cts_gpio)); + return IRQ_HANDLED; } static void sirfsoc_uart_enable_ms(struct uart_port *port) { struct sirfsoc_uart_port *sirfport = to_sirfport(port); - unsigned long reg; - unsigned long flg; + 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; - flg = SIRFUART_AFC_RX_EN | SIRFUART_AFC_TX_EN; - reg = rd_regl(port, SIRFUART_AFC_CTRL); - wr_regl(port, SIRFUART_AFC_CTRL, reg | flg); - reg = rd_regl(port, SIRFUART_INT_EN); - wr_regl(port, SIRFUART_INT_EN, reg | SIRFUART_CTS_INT_EN); - uart_handle_cts_change(port, - !(rd_regl(port, SIRFUART_AFC_CTRL) & SIRFUART_CTS_IN_STATUS)); - sirfport->ms_enabled = 1; + 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); + if (!sirfport->is_marco) + 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) { - unsigned long ulcon = rd_regl(port, SIRFUART_LINE_CTRL); - if (break_state) - ulcon |= SIRFUART_SET_BREAK; - else - ulcon &= ~SIRFUART_SET_BREAK; - wr_regl(port, SIRFUART_LINE_CTRL, ulcon); + 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; - - while (!(rd_regl(port, SIRFUART_RX_FIFO_STATUS) & - SIRFUART_FIFOEMPTY_MASK(port))) { - ch = rd_regl(port, SIRFUART_RX_FIFO_DATA) | SIRFUART_DUMMY_READ; + 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->line))) { + 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); @@ -218,8 +426,12 @@ sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count) break; } + sirfport->rx_io_count += rx_count; port->icount.rx += rx_count; + + spin_unlock(&port->lock); tty_flip_buffer_push(&port->state->port); + spin_lock(&port->lock); return rx_count; } @@ -228,13 +440,16 @@ 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, SIRFUART_TX_FIFO_STATUS) & - SIRFUART_FIFOFULL_MASK(port)) && + !(rd_regl(port, ureg->sirfsoc_tx_fifo_status) & + ufifo_st->ff_full(port->line)) && count--) { - wr_regl(port, SIRFUART_TX_FIFO_DATA, xmit->buf[xmit->tail]); + 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++; @@ -244,6 +459,166 @@ sirfsoc_uart_pio_tx_chars(struct sirfsoc_uart_port *sirfport, int count) 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; + + 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); + spin_lock_irqsave(&sirfport->tx_lock, flags); + sirfport->tx_dma_state = TX_DMA_IDLE; + sirfsoc_uart_tx_with_dma(sirfport); + spin_unlock_irqrestore(&sirfport->tx_lock, flags); +} + +static void sirfsoc_uart_insert_rx_buf_to_tty( + struct sirfsoc_uart_port *sirfport, int count) +{ + struct uart_port *port = &sirfport->port; + struct tty_port *tport = &port->state->port; + int inserted; + + inserted = tty_insert_flip_string(tport, + sirfport->rx_dma_items[sirfport->rx_completed].xmit.buf, count); + port->icount.rx += inserted; + tty_flip_buffer_push(tport); +} + +static void sirfsoc_rx_submit_one_dma_desc(struct uart_port *port, int index) +{ + struct sirfsoc_uart_port *sirfport = to_sirfport(port); + + sirfport->rx_dma_items[index].xmit.tail = + sirfport->rx_dma_items[index].xmit.head = 0; + sirfport->rx_dma_items[index].desc = + dmaengine_prep_slave_single(sirfport->rx_dma_chan, + sirfport->rx_dma_items[index].dma_addr, SIRFSOC_RX_DMA_BUF_SIZE, + DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); + if (!sirfport->rx_dma_items[index].desc) { + dev_err(port->dev, "DMA slave single fail\n"); + return; + } + sirfport->rx_dma_items[index].desc->callback = + sirfsoc_uart_rx_dma_complete_callback; + sirfport->rx_dma_items[index].desc->callback_param = sirfport; + sirfport->rx_dma_items[index].cookie = + dmaengine_submit(sirfport->rx_dma_items[index].desc); + dma_async_issue_pending(sirfport->rx_dma_chan); +} + +static void sirfsoc_rx_tmo_process_tl(unsigned long param) +{ + struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param; + 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 sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st; + unsigned int count; + unsigned long flags; + + spin_lock_irqsave(&sirfport->rx_lock, flags); + while (sirfport->rx_completed != sirfport->rx_issued) { + sirfsoc_uart_insert_rx_buf_to_tty(sirfport, + SIRFSOC_RX_DMA_BUF_SIZE); + sirfsoc_rx_submit_one_dma_desc(port, sirfport->rx_completed++); + sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT; + } + count = CIRC_CNT(sirfport->rx_dma_items[sirfport->rx_issued].xmit.head, + sirfport->rx_dma_items[sirfport->rx_issued].xmit.tail, + SIRFSOC_RX_DMA_BUF_SIZE); + if (count > 0) + sirfsoc_uart_insert_rx_buf_to_tty(sirfport, count); + wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, + rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | + SIRFUART_IO_MODE); + sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count); + spin_unlock_irqrestore(&sirfport->rx_lock, flags); + if (sirfport->rx_io_count == 4) { + spin_lock_irqsave(&sirfport->rx_lock, flags); + sirfport->rx_io_count = 0; + wr_regl(port, ureg->sirfsoc_int_st_reg, + uint_st->sirfsoc_rx_done); + if (!sirfport->is_marco) + 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, SIRFUART_INT_EN_CLR, + uint_en->sirfsoc_rx_done_en); + spin_unlock_irqrestore(&sirfport->rx_lock, flags); + + sirfsoc_uart_start_next_rx_dma(port); + } else { + spin_lock_irqsave(&sirfport->rx_lock, flags); + wr_regl(port, ureg->sirfsoc_int_st_reg, + uint_st->sirfsoc_rx_done); + if (!sirfport->is_marco) + 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_reg, + uint_en->sirfsoc_rx_done_en); + spin_unlock_irqrestore(&sirfport->rx_lock, flags); + } +} + +static void sirfsoc_uart_handle_rx_tmo(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 dma_tx_state tx_state; + spin_lock(&sirfport->rx_lock); + + dmaengine_tx_status(sirfport->rx_dma_chan, + sirfport->rx_dma_items[sirfport->rx_issued].cookie, &tx_state); + dmaengine_terminate_all(sirfport->rx_dma_chan); + sirfport->rx_dma_items[sirfport->rx_issued].xmit.head = + SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue; + if (!sirfport->is_marco) + 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, SIRFUART_INT_EN_CLR, + uint_en->sirfsoc_rx_timeout_en); + spin_unlock(&sirfport->rx_lock); + tasklet_schedule(&sirfport->rx_tmo_process_tasklet); +} + +static void sirfsoc_uart_handle_rx_done(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 sirfsoc_int_status *uint_st = &sirfport->uart_reg->uart_int_st; + + sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count); + if (sirfport->rx_io_count == 4) { + sirfport->rx_io_count = 0; + if (!sirfport->is_marco) + 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, SIRFUART_INT_EN_CLR, + uint_en->sirfsoc_rx_done_en); + wr_regl(port, ureg->sirfsoc_int_st_reg, + uint_st->sirfsoc_rx_timeout); + sirfsoc_uart_start_next_rx_dma(port); + } +} + static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id) { unsigned long intr_status; @@ -251,79 +626,191 @@ static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id) 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, SIRFUART_INT_STATUS); - wr_regl(port, SIRFUART_INT_STATUS, intr_status); - intr_status &= rd_regl(port, SIRFUART_INT_EN); - if (unlikely(intr_status & (SIRFUART_ERR_INT_STAT))) { - if (intr_status & SIRFUART_RXD_BREAK) { + 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(port, uint_st)))) { + if (intr_status & uint_st->sirfsoc_rxd_brk) { + port->icount.brk++; if (uart_handle_break(port)) goto recv_char; - uart_insert_char(port, intr_status, - SIRFUART_RX_OFLOW, 0, TTY_BREAK); - spin_unlock(&port->lock); - return IRQ_HANDLED; } - if (intr_status & SIRFUART_RX_OFLOW) + if (intr_status & uint_st->sirfsoc_rx_oflow) port->icount.overrun++; - if (intr_status & SIRFUART_FRM_ERR) { + if (intr_status & uint_st->sirfsoc_frm_err) { port->icount.frame++; flag = TTY_FRAME; } - if (intr_status & SIRFUART_PARITY_ERR) + if (intr_status & uint_st->sirfsoc_parity_err) flag = TTY_PARITY; - wr_regl(port, SIRFUART_RX_FIFO_OP, SIRFUART_RX_FIFO_RESET); - wr_regl(port, SIRFUART_RX_FIFO_OP, 0); - wr_regl(port, SIRFUART_RX_FIFO_OP, SIRFUART_RX_FIFO_START); + 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, - SIRFUART_RX_OFLOW_INT, 0, flag); + uint_en->sirfsoc_rx_oflow_en, 0, flag); + tty_flip_buffer_push(&state->port); } recv_char: - if (intr_status & SIRFUART_CTS_INT_EN) { - cts_status = !(rd_regl(port, SIRFUART_AFC_CTRL) & - SIRFUART_CTS_IN_STATUS); - if (cts_status != 0) { - uart_handle_cts_change(port, 1); - } else { - uart_handle_cts_change(port, 0); - wake_up_interruptible(&state->port.delta_msr_wait); - } + 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 (intr_status & SIRFUART_RX_IO_INT_EN) - sirfsoc_uart_pio_rx_chars(port, SIRFSOC_UART_IO_RX_MAX_CNT); - if (intr_status & SIRFUART_TX_INT_EN) { - if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - spin_unlock(&port->lock); - return IRQ_HANDLED; - } else { - sirfsoc_uart_pio_tx_chars(sirfport, + if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) { + if (intr_status & uint_st->sirfsoc_rx_timeout) + sirfsoc_uart_handle_rx_tmo(sirfport); + if (intr_status & uint_st->sirfsoc_rx_done) + sirfsoc_uart_handle_rx_done(sirfport); + } else { + if (intr_status & SIRFUART_RX_IO_INT_ST(uint_st)) + sirfsoc_uart_pio_rx_chars(port, + SIRFSOC_UART_IO_RX_MAX_CNT); + } + if (intr_status & uint_st->sirfsoc_txfifo_empty) { + if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) + 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, SIRFSOC_UART_IO_TX_REASONABLE_CNT); - if ((uart_circ_empty(xmit)) && - (rd_regl(port, SIRFUART_TX_FIFO_STATUS) & - SIRFUART_FIFOEMPTY_MASK(port))) - sirfsoc_uart_stop_tx(port); + if ((uart_circ_empty(xmit)) && + (rd_regl(port, ureg->sirfsoc_tx_fifo_status) & + ufifo_st->ff_empty(port->line))) + sirfsoc_uart_stop_tx(port); + } } } spin_unlock(&port->lock); return IRQ_HANDLED; } +static void sirfsoc_uart_rx_dma_complete_tl(unsigned long param) +{ + struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param; + struct uart_port *port = &sirfport->port; + unsigned long flags; + spin_lock_irqsave(&sirfport->rx_lock, flags); + while (sirfport->rx_completed != sirfport->rx_issued) { + sirfsoc_uart_insert_rx_buf_to_tty(sirfport, + SIRFSOC_RX_DMA_BUF_SIZE); + sirfsoc_rx_submit_one_dma_desc(port, sirfport->rx_completed++); + sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT; + } + spin_unlock_irqrestore(&sirfport->rx_lock, flags); +} + +static void sirfsoc_uart_rx_dma_complete_callback(void *param) +{ + struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param; + spin_lock(&sirfport->rx_lock); + sirfport->rx_issued++; + sirfport->rx_issued %= SIRFSOC_RX_LOOP_BUF_CNT; + spin_unlock(&sirfport->rx_lock); + tasklet_schedule(&sirfport->rx_dma_complete_tasklet); +} + +/* 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; + unsigned long flags; + int i; + spin_lock_irqsave(&sirfport->rx_lock, flags); + sirfport->rx_io_count = 0; + wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, + rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & + ~SIRFUART_IO_MODE); + spin_unlock_irqrestore(&sirfport->rx_lock, flags); + for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++) + sirfsoc_rx_submit_one_dma_desc(port, i); + sirfport->rx_completed = sirfport->rx_issued = 0; + spin_lock_irqsave(&sirfport->rx_lock, flags); + if (!sirfport->is_marco) + wr_regl(port, ureg->sirfsoc_int_en_reg, + rd_regl(port, ureg->sirfsoc_int_en_reg) | + SIRFUART_RX_DMA_INT_EN(port, uint_en)); + else + wr_regl(port, ureg->sirfsoc_int_en_reg, + SIRFUART_RX_DMA_INT_EN(port, uint_en)); + spin_unlock_irqrestore(&sirfport->rx_lock, flags); +} + static void sirfsoc_uart_start_rx(struct uart_port *port) { - unsigned long regv; - regv = rd_regl(port, SIRFUART_INT_EN); - wr_regl(port, SIRFUART_INT_EN, regv | SIRFUART_RX_IO_INT_EN); - wr_regl(port, SIRFUART_RX_FIFO_OP, SIRFUART_RX_FIFO_RESET); - wr_regl(port, SIRFUART_RX_FIFO_OP, 0); - wr_regl(port, SIRFUART_RX_FIFO_OP, SIRFUART_RX_FIFO_START); + 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; + + sirfport->rx_io_count = 0; + 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); + if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) + sirfsoc_uart_start_next_rx_dma(port); + else { + if (!sirfport->is_marco) + wr_regl(port, ureg->sirfsoc_int_en_reg, + rd_regl(port, ureg->sirfsoc_int_en_reg) | + SIRFUART_RX_IO_INT_EN(port, uint_en)); + else + wr_regl(port, ureg->sirfsoc_int_en_reg, + SIRFUART_RX_IO_INT_EN(port, uint_en)); + } +} + +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_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_calc_sample_div(unsigned long baud_rate, - unsigned long ioclk_rate, unsigned long *setted_baud) +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; @@ -346,7 +833,7 @@ sirfsoc_calc_sample_div(unsigned long baud_rate, regv = regv & (~SIRF_SAMPLE_DIV_MASK); regv = regv | (sample_div << SIRF_SAMPLE_DIV_SHIFT); min_delta = temp_delta; - *setted_baud = baud_tmp; + *set_baud = baud_tmp; } } return regv; @@ -357,63 +844,93 @@ static void sirfsoc_uart_set_termios(struct uart_port *port, 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 setted_baud; + unsigned long set_baud; unsigned long flags; unsigned long ic; unsigned int clk_div_reg = 0; - unsigned long temp_reg_val; + unsigned long txfifo_op_reg, ioclk_rate; unsigned long rx_time_out; int threshold_div; - int temp; + 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) + if (termios->c_cflag & CSTOPB) { config_reg |= SIRFUART_STOP_BIT_LEN_2; - baud_rate = uart_get_baud_rate(port, termios, old, 0, 4000000); + stop_bit_len = 2; + } else + stop_bit_len = 1; + spin_lock_irqsave(&port->lock, flags); - port->read_status_mask = SIRFUART_RX_OFLOW_INT; + port->read_status_mask = uint_en->sirfsoc_rx_oflow_en; port->ignore_status_mask = 0; - /* read flags */ - if (termios->c_iflag & INPCK) - port->read_status_mask |= - SIRFUART_FRM_ERR_INT | SIRFUART_PARITY_ERR_INT; + 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 & (BRKINT | PARMRK)) - port->read_status_mask |= SIRFUART_RXD_BREAK_INT; - /* ignore flags */ - if (termios->c_iflag & IGNPAR) + 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 |= - SIRFUART_FRM_ERR_INT | SIRFUART_PARITY_ERR_INT; + 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; - /* enable parity if PARENB is set*/ - 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; - } - } /* Hardware Flow Control Settings */ if (UART_ENABLE_MS(port, termios->c_cflag)) { if (!sirfport->ms_enabled) @@ -422,75 +939,184 @@ static void sirfsoc_uart_set_termios(struct uart_port *port, if (sirfport->ms_enabled) sirfsoc_uart_disable_ms(port); } - - if (port->uartclk == 150000000) { - /* common rate: fast calculation */ + 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; } - - setted_baud = baud_rate; - /* arbitary rate setting */ - if (unlikely(clk_div_reg == 0)) - clk_div_reg = sirfsoc_calc_sample_div(baud_rate, port->uartclk, - &setted_baud); - wr_regl(port, SIRFUART_DIVISOR, clk_div_reg); - + 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 & |