682 строки
18 KiB
C
682 строки
18 KiB
C
// 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 <matthias.bgg@gmail.com>
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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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#include "8250.h"
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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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/* 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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if (data->rx_status == DMA_RX_SHUTDOWN)
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return;
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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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}
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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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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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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, old);
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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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/* 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)
|
|
if (!mtk8250_runtime_resume(port->dev))
|
|
pm_runtime_get_sync(port->dev);
|
|
|
|
serial8250_do_pm(port, state, old);
|
|
|
|
if (state)
|
|
if (!pm_runtime_put_sync_suspend(port->dev))
|
|
mtk8250_runtime_suspend(port->dev);
|
|
}
|
|
|
|
#ifdef CONFIG_SERIAL_8250_DMA
|
|
static bool mtk8250_dma_filter(struct dma_chan *chan, void *param)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
static int mtk8250_probe_of(struct platform_device *pdev, struct uart_port *p,
|
|
struct mtk8250_data *data)
|
|
{
|
|
#ifdef CONFIG_SERIAL_8250_DMA
|
|
int dmacnt;
|
|
#endif
|
|
|
|
data->uart_clk = devm_clk_get(&pdev->dev, "baud");
|
|
if (IS_ERR(data->uart_clk)) {
|
|
/*
|
|
* For compatibility with older device trees try unnamed
|
|
* clk when no baud clk can be found.
|
|
*/
|
|
data->uart_clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(data->uart_clk)) {
|
|
dev_warn(&pdev->dev, "Can't get uart clock\n");
|
|
return PTR_ERR(data->uart_clk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
data->bus_clk = devm_clk_get(&pdev->dev, "bus");
|
|
if (IS_ERR(data->bus_clk))
|
|
return PTR_ERR(data->bus_clk);
|
|
|
|
data->dma = NULL;
|
|
#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)
|
|
return err;
|
|
|
|
data->line = serial8250_register_8250_port(&uart);
|
|
if (data->line < 0)
|
|
return data->line;
|
|
|
|
data->rx_wakeup_irq = platform_get_irq_optional(pdev, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
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");
|