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694 lines
18 KiB
694 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Mediatek 8250 driver. |
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* |
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* Copyright (c) 2014 MundoReader S.L. |
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* Author: Matthias Brugger <[email protected]> |
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*/ |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of_irq.h> |
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#include <linux/of_platform.h> |
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#include <linux/pinctrl/consumer.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/serial_8250.h> |
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#include <linux/serial_reg.h> |
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#include <linux/console.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/tty.h> |
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#include <linux/tty_flip.h> |
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|
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#include "8250.h" |
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|
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#define MTK_UART_HIGHS 0x09 /* Highspeed register */ |
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#define MTK_UART_SAMPLE_COUNT 0x0a /* Sample count register */ |
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#define MTK_UART_SAMPLE_POINT 0x0b /* Sample point register */ |
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#define MTK_UART_RATE_FIX 0x0d /* UART Rate Fix Register */ |
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#define MTK_UART_ESCAPE_DAT 0x10 /* Escape Character register */ |
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#define MTK_UART_ESCAPE_EN 0x11 /* Escape Enable register */ |
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#define MTK_UART_DMA_EN 0x13 /* DMA Enable register */ |
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#define MTK_UART_RXTRI_AD 0x14 /* RX Trigger address */ |
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#define MTK_UART_FRACDIV_L 0x15 /* Fractional divider LSB address */ |
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#define MTK_UART_FRACDIV_M 0x16 /* Fractional divider MSB address */ |
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#define MTK_UART_DEBUG0 0x18 |
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#define MTK_UART_IER_XOFFI 0x20 /* Enable XOFF character interrupt */ |
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#define MTK_UART_IER_RTSI 0x40 /* Enable RTS Modem status interrupt */ |
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#define MTK_UART_IER_CTSI 0x80 /* Enable CTS Modem status interrupt */ |
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#define MTK_UART_EFR_EN 0x10 /* Enable enhancement feature */ |
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#define MTK_UART_EFR_RTS 0x40 /* Enable hardware rx flow control */ |
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#define MTK_UART_EFR_CTS 0x80 /* Enable hardware tx flow control */ |
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#define MTK_UART_EFR_NO_SW_FC 0x0 /* no sw flow control */ |
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#define MTK_UART_EFR_XON1_XOFF1 0xa /* XON1/XOFF1 as sw flow control */ |
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#define MTK_UART_EFR_XON2_XOFF2 0x5 /* XON2/XOFF2 as sw flow control */ |
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#define MTK_UART_EFR_SW_FC_MASK 0xf /* Enable CTS Modem status interrupt */ |
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#define MTK_UART_EFR_HW_FC (MTK_UART_EFR_RTS | MTK_UART_EFR_CTS) |
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#define MTK_UART_DMA_EN_TX 0x2 |
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#define MTK_UART_DMA_EN_RX 0x5 |
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#define MTK_UART_ESCAPE_CHAR 0x77 /* Escape char added under sw fc */ |
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#define MTK_UART_RX_SIZE 0x8000 |
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#define MTK_UART_TX_TRIGGER 1 |
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#define MTK_UART_RX_TRIGGER MTK_UART_RX_SIZE |
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#ifdef CONFIG_SERIAL_8250_DMA |
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enum dma_rx_status { |
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DMA_RX_START = 0, |
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DMA_RX_RUNNING = 1, |
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DMA_RX_SHUTDOWN = 2, |
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}; |
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#endif |
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struct mtk8250_data { |
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int line; |
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unsigned int rx_pos; |
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unsigned int clk_count; |
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struct clk *uart_clk; |
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struct clk *bus_clk; |
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struct uart_8250_dma *dma; |
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#ifdef CONFIG_SERIAL_8250_DMA |
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enum dma_rx_status rx_status; |
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#endif |
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int rx_wakeup_irq; |
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}; |
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|
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/* flow control mode */ |
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enum { |
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MTK_UART_FC_NONE, |
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MTK_UART_FC_SW, |
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MTK_UART_FC_HW, |
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}; |
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#ifdef CONFIG_SERIAL_8250_DMA |
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static void mtk8250_rx_dma(struct uart_8250_port *up); |
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static void mtk8250_dma_rx_complete(void *param) |
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{ |
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struct uart_8250_port *up = param; |
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struct uart_8250_dma *dma = up->dma; |
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struct mtk8250_data *data = up->port.private_data; |
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struct tty_port *tty_port = &up->port.state->port; |
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struct dma_tx_state state; |
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int copied, total, cnt; |
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unsigned char *ptr; |
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unsigned long flags; |
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if (data->rx_status == DMA_RX_SHUTDOWN) |
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return; |
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spin_lock_irqsave(&up->port.lock, flags); |
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dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state); |
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total = dma->rx_size - state.residue; |
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cnt = total; |
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if ((data->rx_pos + cnt) > dma->rx_size) |
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cnt = dma->rx_size - data->rx_pos; |
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ptr = (unsigned char *)(data->rx_pos + dma->rx_buf); |
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copied = tty_insert_flip_string(tty_port, ptr, cnt); |
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data->rx_pos += cnt; |
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if (total > cnt) { |
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ptr = (unsigned char *)(dma->rx_buf); |
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cnt = total - cnt; |
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copied += tty_insert_flip_string(tty_port, ptr, cnt); |
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data->rx_pos = cnt; |
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} |
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up->port.icount.rx += copied; |
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tty_flip_buffer_push(tty_port); |
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mtk8250_rx_dma(up); |
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spin_unlock_irqrestore(&up->port.lock, flags); |
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} |
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static void mtk8250_rx_dma(struct uart_8250_port *up) |
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{ |
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struct uart_8250_dma *dma = up->dma; |
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struct dma_async_tx_descriptor *desc; |
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desc = dmaengine_prep_slave_single(dma->rxchan, dma->rx_addr, |
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dma->rx_size, DMA_DEV_TO_MEM, |
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
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if (!desc) { |
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pr_err("failed to prepare rx slave single\n"); |
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return; |
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} |
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desc->callback = mtk8250_dma_rx_complete; |
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desc->callback_param = up; |
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dma->rx_cookie = dmaengine_submit(desc); |
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dma_async_issue_pending(dma->rxchan); |
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} |
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static void mtk8250_dma_enable(struct uart_8250_port *up) |
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{ |
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struct uart_8250_dma *dma = up->dma; |
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struct mtk8250_data *data = up->port.private_data; |
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int lcr = serial_in(up, UART_LCR); |
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if (data->rx_status != DMA_RX_START) |
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return; |
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dma->rxconf.src_port_window_size = dma->rx_size; |
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dma->rxconf.src_addr = dma->rx_addr; |
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dma->txconf.dst_port_window_size = UART_XMIT_SIZE; |
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dma->txconf.dst_addr = dma->tx_addr; |
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serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | |
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UART_FCR_CLEAR_XMIT); |
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serial_out(up, MTK_UART_DMA_EN, |
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MTK_UART_DMA_EN_RX | MTK_UART_DMA_EN_TX); |
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serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
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serial_out(up, UART_EFR, UART_EFR_ECB); |
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serial_out(up, UART_LCR, lcr); |
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if (dmaengine_slave_config(dma->rxchan, &dma->rxconf) != 0) |
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pr_err("failed to configure rx dma channel\n"); |
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if (dmaengine_slave_config(dma->txchan, &dma->txconf) != 0) |
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pr_err("failed to configure tx dma channel\n"); |
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data->rx_status = DMA_RX_RUNNING; |
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data->rx_pos = 0; |
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mtk8250_rx_dma(up); |
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} |
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#endif |
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static int mtk8250_startup(struct uart_port *port) |
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{ |
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#ifdef CONFIG_SERIAL_8250_DMA |
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struct uart_8250_port *up = up_to_u8250p(port); |
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struct mtk8250_data *data = port->private_data; |
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/* disable DMA for console */ |
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if (uart_console(port)) |
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up->dma = NULL; |
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if (up->dma) { |
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data->rx_status = DMA_RX_START; |
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uart_circ_clear(&port->state->xmit); |
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} |
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#endif |
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memset(&port->icount, 0, sizeof(port->icount)); |
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return serial8250_do_startup(port); |
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} |
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static void mtk8250_shutdown(struct uart_port *port) |
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{ |
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#ifdef CONFIG_SERIAL_8250_DMA |
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struct uart_8250_port *up = up_to_u8250p(port); |
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struct mtk8250_data *data = port->private_data; |
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if (up->dma) |
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data->rx_status = DMA_RX_SHUTDOWN; |
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#endif |
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return serial8250_do_shutdown(port); |
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} |
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static void mtk8250_disable_intrs(struct uart_8250_port *up, int mask) |
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{ |
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serial_out(up, UART_IER, serial_in(up, UART_IER) & (~mask)); |
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} |
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static void mtk8250_enable_intrs(struct uart_8250_port *up, int mask) |
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{ |
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serial_out(up, UART_IER, serial_in(up, UART_IER) | mask); |
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} |
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static void mtk8250_set_flow_ctrl(struct uart_8250_port *up, int mode) |
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{ |
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struct uart_port *port = &up->port; |
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int lcr = serial_in(up, UART_LCR); |
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serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
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serial_out(up, UART_EFR, UART_EFR_ECB); |
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serial_out(up, UART_LCR, lcr); |
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lcr = serial_in(up, UART_LCR); |
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switch (mode) { |
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case MTK_UART_FC_NONE: |
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serial_out(up, MTK_UART_ESCAPE_DAT, MTK_UART_ESCAPE_CHAR); |
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serial_out(up, MTK_UART_ESCAPE_EN, 0x00); |
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serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
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serial_out(up, UART_EFR, serial_in(up, UART_EFR) & |
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(~(MTK_UART_EFR_HW_FC | MTK_UART_EFR_SW_FC_MASK))); |
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serial_out(up, UART_LCR, lcr); |
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mtk8250_disable_intrs(up, MTK_UART_IER_XOFFI | |
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MTK_UART_IER_RTSI | MTK_UART_IER_CTSI); |
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break; |
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case MTK_UART_FC_HW: |
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serial_out(up, MTK_UART_ESCAPE_DAT, MTK_UART_ESCAPE_CHAR); |
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serial_out(up, MTK_UART_ESCAPE_EN, 0x00); |
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serial_out(up, UART_MCR, UART_MCR_RTS); |
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serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
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/*enable hw flow control*/ |
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serial_out(up, UART_EFR, MTK_UART_EFR_HW_FC | |
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(serial_in(up, UART_EFR) & |
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(~(MTK_UART_EFR_HW_FC | MTK_UART_EFR_SW_FC_MASK)))); |
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serial_out(up, UART_LCR, lcr); |
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mtk8250_disable_intrs(up, MTK_UART_IER_XOFFI); |
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mtk8250_enable_intrs(up, MTK_UART_IER_CTSI | MTK_UART_IER_RTSI); |
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break; |
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case MTK_UART_FC_SW: /*MTK software flow control */ |
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serial_out(up, MTK_UART_ESCAPE_DAT, MTK_UART_ESCAPE_CHAR); |
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serial_out(up, MTK_UART_ESCAPE_EN, 0x01); |
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serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); |
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/*enable sw flow control */ |
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serial_out(up, UART_EFR, MTK_UART_EFR_XON1_XOFF1 | |
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(serial_in(up, UART_EFR) & |
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(~(MTK_UART_EFR_HW_FC | MTK_UART_EFR_SW_FC_MASK)))); |
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serial_out(up, UART_XON1, START_CHAR(port->state->port.tty)); |
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serial_out(up, UART_XOFF1, STOP_CHAR(port->state->port.tty)); |
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serial_out(up, UART_LCR, lcr); |
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mtk8250_disable_intrs(up, MTK_UART_IER_CTSI|MTK_UART_IER_RTSI); |
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mtk8250_enable_intrs(up, MTK_UART_IER_XOFFI); |
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break; |
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default: |
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break; |
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} |
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} |
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static void |
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mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, |
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struct ktermios *old) |
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{ |
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static const unsigned short fraction_L_mapping[] = { |
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0, 1, 0x5, 0x15, 0x55, 0x57, 0x57, 0x77, 0x7F, 0xFF, 0xFF |
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}; |
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static const unsigned short fraction_M_mapping[] = { |
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0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 3 |
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}; |
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struct uart_8250_port *up = up_to_u8250p(port); |
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unsigned int baud, quot, fraction; |
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unsigned long flags; |
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int mode; |
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#ifdef CONFIG_SERIAL_8250_DMA |
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if (up->dma) { |
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if (uart_console(port)) { |
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devm_kfree(up->port.dev, up->dma); |
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up->dma = NULL; |
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} else { |
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mtk8250_dma_enable(up); |
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} |
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} |
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#endif |
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/* |
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* Store the requested baud rate before calling the generic 8250 |
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* set_termios method. Standard 8250 port expects bauds to be |
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* no higher than (uartclk / 16) so the baud will be clamped if it |
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* gets out of that bound. Mediatek 8250 port supports speed |
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* higher than that, therefore we'll get original baud rate back |
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* after calling the generic set_termios method and recalculate |
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* the speed later in this method. |
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*/ |
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baud = tty_termios_baud_rate(termios); |
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serial8250_do_set_termios(port, termios, NULL); |
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tty_termios_encode_baud_rate(termios, baud, baud); |
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/* |
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* Mediatek UARTs use an extra highspeed register (MTK_UART_HIGHS) |
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* |
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* We need to recalcualte the quot register, as the claculation depends |
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* on the vaule in the highspeed register. |
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* |
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* Some baudrates are not supported by the chip, so we use the next |
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* lower rate supported and update termios c_flag. |
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* |
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* If highspeed register is set to 3, we need to specify sample count |
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* and sample point to increase accuracy. If not, we reset the |
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* registers to their default values. |
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*/ |
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baud = uart_get_baud_rate(port, termios, old, |
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port->uartclk / 16 / UART_DIV_MAX, |
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port->uartclk); |
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if (baud < 115200) { |
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serial_port_out(port, MTK_UART_HIGHS, 0x0); |
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quot = uart_get_divisor(port, baud); |
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} else { |
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serial_port_out(port, MTK_UART_HIGHS, 0x3); |
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quot = DIV_ROUND_UP(port->uartclk, 256 * baud); |
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} |
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/* |
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* Ok, we're now changing the port state. Do it with |
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* interrupts disabled. |
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*/ |
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spin_lock_irqsave(&port->lock, flags); |
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/* |
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* Update the per-port timeout. |
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*/ |
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uart_update_timeout(port, termios->c_cflag, baud); |
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/* set DLAB we have cval saved in up->lcr from the call to the core */ |
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serial_port_out(port, UART_LCR, up->lcr | UART_LCR_DLAB); |
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serial_dl_write(up, quot); |
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/* reset DLAB */ |
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serial_port_out(port, UART_LCR, up->lcr); |
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if (baud >= 115200) { |
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unsigned int tmp; |
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tmp = (port->uartclk / (baud * quot)) - 1; |
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serial_port_out(port, MTK_UART_SAMPLE_COUNT, tmp); |
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serial_port_out(port, MTK_UART_SAMPLE_POINT, |
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(tmp >> 1) - 1); |
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/*count fraction to set fractoin register */ |
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fraction = ((port->uartclk * 100) / baud / quot) % 100; |
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fraction = DIV_ROUND_CLOSEST(fraction, 10); |
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serial_port_out(port, MTK_UART_FRACDIV_L, |
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fraction_L_mapping[fraction]); |
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serial_port_out(port, MTK_UART_FRACDIV_M, |
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fraction_M_mapping[fraction]); |
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} else { |
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serial_port_out(port, MTK_UART_SAMPLE_COUNT, 0x00); |
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serial_port_out(port, MTK_UART_SAMPLE_POINT, 0xff); |
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serial_port_out(port, MTK_UART_FRACDIV_L, 0x00); |
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serial_port_out(port, MTK_UART_FRACDIV_M, 0x00); |
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} |
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if ((termios->c_cflag & CRTSCTS) && (!(termios->c_iflag & CRTSCTS))) |
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mode = MTK_UART_FC_HW; |
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else if (termios->c_iflag & CRTSCTS) |
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mode = MTK_UART_FC_SW; |
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else |
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mode = MTK_UART_FC_NONE; |
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mtk8250_set_flow_ctrl(up, mode); |
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if (uart_console(port)) |
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up->port.cons->cflag = termios->c_cflag; |
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spin_unlock_irqrestore(&port->lock, flags); |
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/* Don't rewrite B0 */ |
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if (tty_termios_baud_rate(termios)) |
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tty_termios_encode_baud_rate(termios, baud, baud); |
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} |
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static int __maybe_unused mtk8250_runtime_suspend(struct device *dev) |
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{ |
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struct mtk8250_data *data = dev_get_drvdata(dev); |
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struct uart_8250_port *up = serial8250_get_port(data->line); |
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|
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/* wait until UART in idle status */ |
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while |
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(serial_in(up, MTK_UART_DEBUG0)); |
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if (data->clk_count == 0U) { |
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dev_dbg(dev, "%s clock count is 0\n", __func__); |
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} else { |
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clk_disable_unprepare(data->bus_clk); |
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data->clk_count--; |
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} |
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return 0; |
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} |
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static int __maybe_unused mtk8250_runtime_resume(struct device *dev) |
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{ |
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struct mtk8250_data *data = dev_get_drvdata(dev); |
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int err; |
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if (data->clk_count > 0U) { |
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dev_dbg(dev, "%s clock count is %d\n", __func__, |
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data->clk_count); |
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} else { |
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err = clk_prepare_enable(data->bus_clk); |
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if (err) { |
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dev_warn(dev, "Can't enable bus clock\n"); |
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return err; |
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} |
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data->clk_count++; |
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} |
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return 0; |
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} |
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static void |
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mtk8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old) |
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{ |
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if (!state) |
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if (!mtk8250_runtime_resume(port->dev)) |
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pm_runtime_get_sync(port->dev); |
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serial8250_do_pm(port, state, old); |
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if (state) |
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if (!pm_runtime_put_sync_suspend(port->dev)) |
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mtk8250_runtime_suspend(port->dev); |
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} |
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#ifdef CONFIG_SERIAL_8250_DMA |
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static bool mtk8250_dma_filter(struct dma_chan *chan, void *param) |
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{ |
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return false; |
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} |
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#endif |
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static int mtk8250_probe_of(struct platform_device *pdev, struct uart_port *p, |
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struct mtk8250_data *data) |
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{ |
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#ifdef CONFIG_SERIAL_8250_DMA |
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int dmacnt; |
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#endif |
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data->uart_clk = devm_clk_get(&pdev->dev, "baud"); |
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if (IS_ERR(data->uart_clk)) { |
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/* |
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* For compatibility with older device trees try unnamed |
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* clk when no baud clk can be found. |
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*/ |
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data->uart_clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(data->uart_clk)) { |
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dev_warn(&pdev->dev, "Can't get uart clock\n"); |
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return PTR_ERR(data->uart_clk); |
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} |
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return 0; |
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} |
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|
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data->bus_clk = devm_clk_get(&pdev->dev, "bus"); |
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if (IS_ERR(data->bus_clk)) |
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return PTR_ERR(data->bus_clk); |
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|
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data->dma = NULL; |
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#ifdef CONFIG_SERIAL_8250_DMA |
|
dmacnt = of_property_count_strings(pdev->dev.of_node, "dma-names"); |
|
if (dmacnt == 2) { |
|
data->dma = devm_kzalloc(&pdev->dev, sizeof(*data->dma), |
|
GFP_KERNEL); |
|
if (!data->dma) |
|
return -ENOMEM; |
|
|
|
data->dma->fn = mtk8250_dma_filter; |
|
data->dma->rx_size = MTK_UART_RX_SIZE; |
|
data->dma->rxconf.src_maxburst = MTK_UART_RX_TRIGGER; |
|
data->dma->txconf.dst_maxburst = MTK_UART_TX_TRIGGER; |
|
} |
|
#endif |
|
|
|
return 0; |
|
} |
|
|
|
static int mtk8250_probe(struct platform_device *pdev) |
|
{ |
|
struct uart_8250_port uart = {}; |
|
struct mtk8250_data *data; |
|
struct resource *regs; |
|
int irq, err; |
|
|
|
irq = platform_get_irq(pdev, 0); |
|
if (irq < 0) |
|
return irq; |
|
|
|
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
|
if (!regs) { |
|
dev_err(&pdev->dev, "no registers defined\n"); |
|
return -EINVAL; |
|
} |
|
|
|
uart.port.membase = devm_ioremap(&pdev->dev, regs->start, |
|
resource_size(regs)); |
|
if (!uart.port.membase) |
|
return -ENOMEM; |
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
data->clk_count = 0; |
|
|
|
if (pdev->dev.of_node) { |
|
err = mtk8250_probe_of(pdev, &uart.port, data); |
|
if (err) |
|
return err; |
|
} else |
|
return -ENODEV; |
|
|
|
spin_lock_init(&uart.port.lock); |
|
uart.port.mapbase = regs->start; |
|
uart.port.irq = irq; |
|
uart.port.pm = mtk8250_do_pm; |
|
uart.port.type = PORT_16550; |
|
uart.port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT; |
|
uart.port.dev = &pdev->dev; |
|
uart.port.iotype = UPIO_MEM32; |
|
uart.port.regshift = 2; |
|
uart.port.private_data = data; |
|
uart.port.shutdown = mtk8250_shutdown; |
|
uart.port.startup = mtk8250_startup; |
|
uart.port.set_termios = mtk8250_set_termios; |
|
uart.port.uartclk = clk_get_rate(data->uart_clk); |
|
#ifdef CONFIG_SERIAL_8250_DMA |
|
if (data->dma) |
|
uart.dma = data->dma; |
|
#endif |
|
|
|
/* Disable Rate Fix function */ |
|
writel(0x0, uart.port.membase + |
|
(MTK_UART_RATE_FIX << uart.port.regshift)); |
|
|
|
platform_set_drvdata(pdev, data); |
|
|
|
pm_runtime_enable(&pdev->dev); |
|
err = mtk8250_runtime_resume(&pdev->dev); |
|
if (err) |
|
goto err_pm_disable; |
|
|
|
data->line = serial8250_register_8250_port(&uart); |
|
if (data->line < 0) { |
|
err = data->line; |
|
goto err_pm_disable; |
|
} |
|
|
|
data->rx_wakeup_irq = platform_get_irq_optional(pdev, 1); |
|
|
|
return 0; |
|
|
|
err_pm_disable: |
|
pm_runtime_disable(&pdev->dev); |
|
|
|
return err; |
|
} |
|
|
|
static int mtk8250_remove(struct platform_device *pdev) |
|
{ |
|
struct mtk8250_data *data = platform_get_drvdata(pdev); |
|
|
|
pm_runtime_get_sync(&pdev->dev); |
|
|
|
serial8250_unregister_port(data->line); |
|
|
|
pm_runtime_disable(&pdev->dev); |
|
pm_runtime_put_noidle(&pdev->dev); |
|
|
|
if (!pm_runtime_status_suspended(&pdev->dev)) |
|
mtk8250_runtime_suspend(&pdev->dev); |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused mtk8250_suspend(struct device *dev) |
|
{ |
|
struct mtk8250_data *data = dev_get_drvdata(dev); |
|
int irq = data->rx_wakeup_irq; |
|
int err; |
|
|
|
serial8250_suspend_port(data->line); |
|
|
|
pinctrl_pm_select_sleep_state(dev); |
|
if (irq >= 0) { |
|
err = enable_irq_wake(irq); |
|
if (err) { |
|
dev_err(dev, |
|
"failed to enable irq wake on IRQ %d: %d\n", |
|
irq, err); |
|
pinctrl_pm_select_default_state(dev); |
|
serial8250_resume_port(data->line); |
|
return err; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused mtk8250_resume(struct device *dev) |
|
{ |
|
struct mtk8250_data *data = dev_get_drvdata(dev); |
|
int irq = data->rx_wakeup_irq; |
|
|
|
if (irq >= 0) |
|
disable_irq_wake(irq); |
|
pinctrl_pm_select_default_state(dev); |
|
|
|
serial8250_resume_port(data->line); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct dev_pm_ops mtk8250_pm_ops = { |
|
SET_SYSTEM_SLEEP_PM_OPS(mtk8250_suspend, mtk8250_resume) |
|
SET_RUNTIME_PM_OPS(mtk8250_runtime_suspend, mtk8250_runtime_resume, |
|
NULL) |
|
}; |
|
|
|
static const struct of_device_id mtk8250_of_match[] = { |
|
{ .compatible = "mediatek,mt6577-uart" }, |
|
{ /* Sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, mtk8250_of_match); |
|
|
|
static struct platform_driver mtk8250_platform_driver = { |
|
.driver = { |
|
.name = "mt6577-uart", |
|
.pm = &mtk8250_pm_ops, |
|
.of_match_table = mtk8250_of_match, |
|
}, |
|
.probe = mtk8250_probe, |
|
.remove = mtk8250_remove, |
|
}; |
|
module_platform_driver(mtk8250_platform_driver); |
|
|
|
#ifdef CONFIG_SERIAL_8250_CONSOLE |
|
static int __init early_mtk8250_setup(struct earlycon_device *device, |
|
const char *options) |
|
{ |
|
if (!device->port.membase) |
|
return -ENODEV; |
|
|
|
device->port.iotype = UPIO_MEM32; |
|
device->port.regshift = 2; |
|
|
|
return early_serial8250_setup(device, NULL); |
|
} |
|
|
|
OF_EARLYCON_DECLARE(mtk8250, "mediatek,mt6577-uart", early_mtk8250_setup); |
|
#endif |
|
|
|
MODULE_AUTHOR("Matthias Brugger"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("Mediatek 8250 serial port driver");
|
|
|