2013-01-08 10:57:44 +00:00
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/*
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* serial_tegra.c
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*
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* High-speed serial driver for NVIDIA Tegra SoCs
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*
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* Copyright (c) 2012-2013, NVIDIA CORPORATION. All rights reserved.
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*
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* Author: Laxman Dewangan <ldewangan@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/clk.h>
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmapool.h>
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2013-03-04 04:29:00 +00:00
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#include <linux/err.h>
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2013-01-08 10:57:44 +00:00
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/pagemap.h>
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#include <linux/platform_device.h>
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2013-11-06 23:50:44 +00:00
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#include <linux/reset.h>
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2013-01-08 10:57:44 +00:00
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#include <linux/serial.h>
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#include <linux/serial_8250.h>
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#include <linux/serial_core.h>
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#include <linux/serial_reg.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/termios.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#define TEGRA_UART_TYPE "TEGRA_UART"
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#define TX_EMPTY_STATUS (UART_LSR_TEMT | UART_LSR_THRE)
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#define BYTES_TO_ALIGN(x) ((unsigned long)(x) & 0x3)
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#define TEGRA_UART_RX_DMA_BUFFER_SIZE 4096
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#define TEGRA_UART_LSR_TXFIFO_FULL 0x100
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#define TEGRA_UART_IER_EORD 0x20
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#define TEGRA_UART_MCR_RTS_EN 0x40
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#define TEGRA_UART_MCR_CTS_EN 0x20
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#define TEGRA_UART_LSR_ANY (UART_LSR_OE | UART_LSR_BI | \
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UART_LSR_PE | UART_LSR_FE)
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#define TEGRA_UART_IRDA_CSR 0x08
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#define TEGRA_UART_SIR_ENABLED 0x80
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#define TEGRA_UART_TX_PIO 1
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#define TEGRA_UART_TX_DMA 2
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#define TEGRA_UART_MIN_DMA 16
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#define TEGRA_UART_FIFO_SIZE 32
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/*
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* Tx fifo trigger level setting in tegra uart is in
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* reverse way then conventional uart.
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*/
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#define TEGRA_UART_TX_TRIG_16B 0x00
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#define TEGRA_UART_TX_TRIG_8B 0x10
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#define TEGRA_UART_TX_TRIG_4B 0x20
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#define TEGRA_UART_TX_TRIG_1B 0x30
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#define TEGRA_UART_MAXIMUM 5
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/* Default UART setting when started: 115200 no parity, stop, 8 data bits */
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#define TEGRA_UART_DEFAULT_BAUD 115200
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#define TEGRA_UART_DEFAULT_LSR UART_LCR_WLEN8
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/* Tx transfer mode */
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#define TEGRA_TX_PIO 1
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#define TEGRA_TX_DMA 2
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/**
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* tegra_uart_chip_data: SOC specific data.
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*
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* @tx_fifo_full_status: Status flag available for checking tx fifo full.
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* @allow_txfifo_reset_fifo_mode: allow_tx fifo reset with fifo mode or not.
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* Tegra30 does not allow this.
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* @support_clk_src_div: Clock source support the clock divider.
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*/
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struct tegra_uart_chip_data {
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bool tx_fifo_full_status;
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bool allow_txfifo_reset_fifo_mode;
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bool support_clk_src_div;
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};
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struct tegra_uart_port {
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struct uart_port uport;
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const struct tegra_uart_chip_data *cdata;
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struct clk *uart_clk;
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2013-11-06 23:50:44 +00:00
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struct reset_control *rst;
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2013-01-08 10:57:44 +00:00
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unsigned int current_baud;
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/* Register shadow */
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unsigned long fcr_shadow;
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unsigned long mcr_shadow;
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unsigned long lcr_shadow;
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unsigned long ier_shadow;
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bool rts_active;
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int tx_in_progress;
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unsigned int tx_bytes;
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bool enable_modem_interrupt;
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bool rx_timeout;
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int rx_in_progress;
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int symb_bit;
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struct dma_chan *rx_dma_chan;
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struct dma_chan *tx_dma_chan;
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dma_addr_t rx_dma_buf_phys;
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dma_addr_t tx_dma_buf_phys;
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unsigned char *rx_dma_buf_virt;
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unsigned char *tx_dma_buf_virt;
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struct dma_async_tx_descriptor *tx_dma_desc;
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struct dma_async_tx_descriptor *rx_dma_desc;
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dma_cookie_t tx_cookie;
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dma_cookie_t rx_cookie;
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int tx_bytes_requested;
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int rx_bytes_requested;
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};
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static void tegra_uart_start_next_tx(struct tegra_uart_port *tup);
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static int tegra_uart_start_rx_dma(struct tegra_uart_port *tup);
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static inline unsigned long tegra_uart_read(struct tegra_uart_port *tup,
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unsigned long reg)
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{
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return readl(tup->uport.membase + (reg << tup->uport.regshift));
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}
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static inline void tegra_uart_write(struct tegra_uart_port *tup, unsigned val,
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unsigned long reg)
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{
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writel(val, tup->uport.membase + (reg << tup->uport.regshift));
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}
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static inline struct tegra_uart_port *to_tegra_uport(struct uart_port *u)
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{
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return container_of(u, struct tegra_uart_port, uport);
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}
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static unsigned int tegra_uart_get_mctrl(struct uart_port *u)
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{
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struct tegra_uart_port *tup = to_tegra_uport(u);
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/*
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* RI - Ring detector is active
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* CD/DCD/CAR - Carrier detect is always active. For some reason
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* linux has different names for carrier detect.
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* DSR - Data Set ready is active as the hardware doesn't support it.
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* Don't know if the linux support this yet?
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* CTS - Clear to send. Always set to active, as the hardware handles
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* CTS automatically.
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*/
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if (tup->enable_modem_interrupt)
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return TIOCM_RI | TIOCM_CD | TIOCM_DSR | TIOCM_CTS;
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return TIOCM_CTS;
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}
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static void set_rts(struct tegra_uart_port *tup, bool active)
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{
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unsigned long mcr;
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mcr = tup->mcr_shadow;
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if (active)
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mcr |= TEGRA_UART_MCR_RTS_EN;
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else
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mcr &= ~TEGRA_UART_MCR_RTS_EN;
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if (mcr != tup->mcr_shadow) {
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tegra_uart_write(tup, mcr, UART_MCR);
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tup->mcr_shadow = mcr;
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}
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return;
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}
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static void set_dtr(struct tegra_uart_port *tup, bool active)
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{
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unsigned long mcr;
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mcr = tup->mcr_shadow;
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if (active)
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mcr |= UART_MCR_DTR;
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else
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mcr &= ~UART_MCR_DTR;
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if (mcr != tup->mcr_shadow) {
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tegra_uart_write(tup, mcr, UART_MCR);
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tup->mcr_shadow = mcr;
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}
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return;
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}
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static void tegra_uart_set_mctrl(struct uart_port *u, unsigned int mctrl)
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{
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struct tegra_uart_port *tup = to_tegra_uport(u);
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unsigned long mcr;
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int dtr_enable;
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mcr = tup->mcr_shadow;
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tup->rts_active = !!(mctrl & TIOCM_RTS);
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set_rts(tup, tup->rts_active);
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dtr_enable = !!(mctrl & TIOCM_DTR);
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set_dtr(tup, dtr_enable);
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return;
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}
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static void tegra_uart_break_ctl(struct uart_port *u, int break_ctl)
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{
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struct tegra_uart_port *tup = to_tegra_uport(u);
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unsigned long lcr;
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lcr = tup->lcr_shadow;
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if (break_ctl)
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lcr |= UART_LCR_SBC;
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else
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lcr &= ~UART_LCR_SBC;
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tegra_uart_write(tup, lcr, UART_LCR);
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tup->lcr_shadow = lcr;
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}
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/* Wait for a symbol-time. */
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static void tegra_uart_wait_sym_time(struct tegra_uart_port *tup,
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unsigned int syms)
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{
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if (tup->current_baud)
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udelay(DIV_ROUND_UP(syms * tup->symb_bit * 1000000,
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tup->current_baud));
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}
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static void tegra_uart_fifo_reset(struct tegra_uart_port *tup, u8 fcr_bits)
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{
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unsigned long fcr = tup->fcr_shadow;
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if (tup->cdata->allow_txfifo_reset_fifo_mode) {
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fcr |= fcr_bits & (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
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tegra_uart_write(tup, fcr, UART_FCR);
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} else {
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fcr &= ~UART_FCR_ENABLE_FIFO;
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tegra_uart_write(tup, fcr, UART_FCR);
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udelay(60);
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fcr |= fcr_bits & (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
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tegra_uart_write(tup, fcr, UART_FCR);
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fcr |= UART_FCR_ENABLE_FIFO;
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tegra_uart_write(tup, fcr, UART_FCR);
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}
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/* Dummy read to ensure the write is posted */
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tegra_uart_read(tup, UART_SCR);
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/* Wait for the flush to propagate. */
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tegra_uart_wait_sym_time(tup, 1);
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}
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static int tegra_set_baudrate(struct tegra_uart_port *tup, unsigned int baud)
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{
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unsigned long rate;
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unsigned int divisor;
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unsigned long lcr;
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int ret;
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if (tup->current_baud == baud)
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return 0;
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if (tup->cdata->support_clk_src_div) {
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rate = baud * 16;
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ret = clk_set_rate(tup->uart_clk, rate);
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if (ret < 0) {
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dev_err(tup->uport.dev,
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"clk_set_rate() failed for rate %lu\n", rate);
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return ret;
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}
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divisor = 1;
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} else {
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rate = clk_get_rate(tup->uart_clk);
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divisor = DIV_ROUND_CLOSEST(rate, baud * 16);
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}
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lcr = tup->lcr_shadow;
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lcr |= UART_LCR_DLAB;
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tegra_uart_write(tup, lcr, UART_LCR);
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tegra_uart_write(tup, divisor & 0xFF, UART_TX);
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tegra_uart_write(tup, ((divisor >> 8) & 0xFF), UART_IER);
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lcr &= ~UART_LCR_DLAB;
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tegra_uart_write(tup, lcr, UART_LCR);
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/* Dummy read to ensure the write is posted */
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tegra_uart_read(tup, UART_SCR);
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tup->current_baud = baud;
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/* wait two character intervals at new rate */
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tegra_uart_wait_sym_time(tup, 2);
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return 0;
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}
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static char tegra_uart_decode_rx_error(struct tegra_uart_port *tup,
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unsigned long lsr)
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{
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char flag = TTY_NORMAL;
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if (unlikely(lsr & TEGRA_UART_LSR_ANY)) {
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if (lsr & UART_LSR_OE) {
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/* Overrrun error */
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flag |= TTY_OVERRUN;
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tup->uport.icount.overrun++;
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dev_err(tup->uport.dev, "Got overrun errors\n");
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} else if (lsr & UART_LSR_PE) {
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/* Parity error */
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flag |= TTY_PARITY;
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tup->uport.icount.parity++;
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dev_err(tup->uport.dev, "Got Parity errors\n");
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} else if (lsr & UART_LSR_FE) {
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flag |= TTY_FRAME;
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tup->uport.icount.frame++;
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dev_err(tup->uport.dev, "Got frame errors\n");
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} else if (lsr & UART_LSR_BI) {
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dev_err(tup->uport.dev, "Got Break\n");
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tup->uport.icount.brk++;
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/* If FIFO read error without any data, reset Rx FIFO */
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if (!(lsr & UART_LSR_DR) && (lsr & UART_LSR_FIFOE))
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tegra_uart_fifo_reset(tup, UART_FCR_CLEAR_RCVR);
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}
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}
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return flag;
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}
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static int tegra_uart_request_port(struct uart_port *u)
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{
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return 0;
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|
}
|
|
|
|
|
|
|
|
static void tegra_uart_release_port(struct uart_port *u)
|
|
|
|
{
|
|
|
|
/* Nothing to do here */
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_fill_tx_fifo(struct tegra_uart_port *tup, int max_bytes)
|
|
|
|
{
|
|
|
|
struct circ_buf *xmit = &tup->uport.state->xmit;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < max_bytes; i++) {
|
|
|
|
BUG_ON(uart_circ_empty(xmit));
|
|
|
|
if (tup->cdata->tx_fifo_full_status) {
|
|
|
|
unsigned long lsr = tegra_uart_read(tup, UART_LSR);
|
|
|
|
if ((lsr & TEGRA_UART_LSR_TXFIFO_FULL))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
tegra_uart_write(tup, xmit->buf[xmit->tail], UART_TX);
|
|
|
|
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
|
|
|
|
tup->uport.icount.tx++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_start_pio_tx(struct tegra_uart_port *tup,
|
|
|
|
unsigned int bytes)
|
|
|
|
{
|
|
|
|
if (bytes > TEGRA_UART_MIN_DMA)
|
|
|
|
bytes = TEGRA_UART_MIN_DMA;
|
|
|
|
|
|
|
|
tup->tx_in_progress = TEGRA_UART_TX_PIO;
|
|
|
|
tup->tx_bytes = bytes;
|
|
|
|
tup->ier_shadow |= UART_IER_THRI;
|
|
|
|
tegra_uart_write(tup, tup->ier_shadow, UART_IER);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_tx_dma_complete(void *args)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = args;
|
|
|
|
struct circ_buf *xmit = &tup->uport.state->xmit;
|
|
|
|
struct dma_tx_state state;
|
|
|
|
unsigned long flags;
|
|
|
|
int count;
|
|
|
|
|
|
|
|
dmaengine_tx_status(tup->tx_dma_chan, tup->rx_cookie, &state);
|
|
|
|
count = tup->tx_bytes_requested - state.residue;
|
|
|
|
async_tx_ack(tup->tx_dma_desc);
|
|
|
|
spin_lock_irqsave(&tup->uport.lock, flags);
|
|
|
|
xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
|
|
|
|
tup->tx_in_progress = 0;
|
|
|
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
|
|
|
|
uart_write_wakeup(&tup->uport);
|
|
|
|
tegra_uart_start_next_tx(tup);
|
|
|
|
spin_unlock_irqrestore(&tup->uport.lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tegra_uart_start_tx_dma(struct tegra_uart_port *tup,
|
|
|
|
unsigned long count)
|
|
|
|
{
|
|
|
|
struct circ_buf *xmit = &tup->uport.state->xmit;
|
|
|
|
dma_addr_t tx_phys_addr;
|
|
|
|
|
|
|
|
dma_sync_single_for_device(tup->uport.dev, tup->tx_dma_buf_phys,
|
|
|
|
UART_XMIT_SIZE, DMA_TO_DEVICE);
|
|
|
|
|
|
|
|
tup->tx_bytes = count & ~(0xF);
|
|
|
|
tx_phys_addr = tup->tx_dma_buf_phys + xmit->tail;
|
|
|
|
tup->tx_dma_desc = dmaengine_prep_slave_single(tup->tx_dma_chan,
|
|
|
|
tx_phys_addr, tup->tx_bytes, DMA_MEM_TO_DEV,
|
|
|
|
DMA_PREP_INTERRUPT);
|
|
|
|
if (!tup->tx_dma_desc) {
|
|
|
|
dev_err(tup->uport.dev, "Not able to get desc for Tx\n");
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
tup->tx_dma_desc->callback = tegra_uart_tx_dma_complete;
|
|
|
|
tup->tx_dma_desc->callback_param = tup;
|
|
|
|
tup->tx_in_progress = TEGRA_UART_TX_DMA;
|
|
|
|
tup->tx_bytes_requested = tup->tx_bytes;
|
|
|
|
tup->tx_cookie = dmaengine_submit(tup->tx_dma_desc);
|
|
|
|
dma_async_issue_pending(tup->tx_dma_chan);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_start_next_tx(struct tegra_uart_port *tup)
|
|
|
|
{
|
|
|
|
unsigned long tail;
|
|
|
|
unsigned long count;
|
|
|
|
struct circ_buf *xmit = &tup->uport.state->xmit;
|
|
|
|
|
|
|
|
tail = (unsigned long)&xmit->buf[xmit->tail];
|
|
|
|
count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
|
|
|
|
if (!count)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (count < TEGRA_UART_MIN_DMA)
|
|
|
|
tegra_uart_start_pio_tx(tup, count);
|
|
|
|
else if (BYTES_TO_ALIGN(tail) > 0)
|
|
|
|
tegra_uart_start_pio_tx(tup, BYTES_TO_ALIGN(tail));
|
|
|
|
else
|
|
|
|
tegra_uart_start_tx_dma(tup, count);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Called by serial core driver with u->lock taken. */
|
|
|
|
static void tegra_uart_start_tx(struct uart_port *u)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
|
|
|
struct circ_buf *xmit = &u->state->xmit;
|
|
|
|
|
|
|
|
if (!uart_circ_empty(xmit) && !tup->tx_in_progress)
|
|
|
|
tegra_uart_start_next_tx(tup);
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int tegra_uart_tx_empty(struct uart_port *u)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
|
|
|
unsigned int ret = 0;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&u->lock, flags);
|
|
|
|
if (!tup->tx_in_progress) {
|
|
|
|
unsigned long lsr = tegra_uart_read(tup, UART_LSR);
|
|
|
|
if ((lsr & TX_EMPTY_STATUS) == TX_EMPTY_STATUS)
|
|
|
|
ret = TIOCSER_TEMT;
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&u->lock, flags);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_stop_tx(struct uart_port *u)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
|
|
|
struct circ_buf *xmit = &tup->uport.state->xmit;
|
|
|
|
struct dma_tx_state state;
|
|
|
|
int count;
|
|
|
|
|
2014-06-06 11:18:08 +00:00
|
|
|
if (tup->tx_in_progress != TEGRA_UART_TX_DMA)
|
|
|
|
return;
|
|
|
|
|
2013-01-08 10:57:44 +00:00
|
|
|
dmaengine_terminate_all(tup->tx_dma_chan);
|
|
|
|
dmaengine_tx_status(tup->tx_dma_chan, tup->tx_cookie, &state);
|
|
|
|
count = tup->tx_bytes_requested - state.residue;
|
|
|
|
async_tx_ack(tup->tx_dma_desc);
|
|
|
|
xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
|
|
|
|
tup->tx_in_progress = 0;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_handle_tx_pio(struct tegra_uart_port *tup)
|
|
|
|
{
|
|
|
|
struct circ_buf *xmit = &tup->uport.state->xmit;
|
|
|
|
|
|
|
|
tegra_uart_fill_tx_fifo(tup, tup->tx_bytes);
|
|
|
|
tup->tx_in_progress = 0;
|
|
|
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
|
|
|
|
uart_write_wakeup(&tup->uport);
|
|
|
|
tegra_uart_start_next_tx(tup);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_handle_rx_pio(struct tegra_uart_port *tup,
|
2013-01-17 13:31:45 +00:00
|
|
|
struct tty_port *tty)
|
2013-01-08 10:57:44 +00:00
|
|
|
{
|
|
|
|
do {
|
|
|
|
char flag = TTY_NORMAL;
|
|
|
|
unsigned long lsr = 0;
|
|
|
|
unsigned char ch;
|
|
|
|
|
|
|
|
lsr = tegra_uart_read(tup, UART_LSR);
|
|
|
|
if (!(lsr & UART_LSR_DR))
|
|
|
|
break;
|
|
|
|
|
|
|
|
flag = tegra_uart_decode_rx_error(tup, lsr);
|
|
|
|
ch = (unsigned char) tegra_uart_read(tup, UART_RX);
|
|
|
|
tup->uport.icount.rx++;
|
|
|
|
|
|
|
|
if (!uart_handle_sysrq_char(&tup->uport, ch) && tty)
|
|
|
|
tty_insert_flip_char(tty, ch, flag);
|
|
|
|
} while (1);
|
|
|
|
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup,
|
2013-01-17 13:31:45 +00:00
|
|
|
struct tty_port *tty, int count)
|
2013-01-08 10:57:44 +00:00
|
|
|
{
|
|
|
|
int copied;
|
|
|
|
|
|
|
|
tup->uport.icount.rx += count;
|
|
|
|
if (!tty) {
|
|
|
|
dev_err(tup->uport.dev, "No tty port\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
dma_sync_single_for_cpu(tup->uport.dev, tup->rx_dma_buf_phys,
|
|
|
|
TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
|
|
|
|
copied = tty_insert_flip_string(tty,
|
|
|
|
((unsigned char *)(tup->rx_dma_buf_virt)), count);
|
|
|
|
if (copied != count) {
|
|
|
|
WARN_ON(1);
|
|
|
|
dev_err(tup->uport.dev, "RxData copy to tty layer failed\n");
|
|
|
|
}
|
|
|
|
dma_sync_single_for_device(tup->uport.dev, tup->rx_dma_buf_phys,
|
|
|
|
TEGRA_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_rx_dma_complete(void *args)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = args;
|
|
|
|
struct uart_port *u = &tup->uport;
|
|
|
|
int count = tup->rx_bytes_requested;
|
|
|
|
struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port);
|
2013-01-17 13:31:45 +00:00
|
|
|
struct tty_port *port = &u->state->port;
|
2013-01-08 10:57:44 +00:00
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
async_tx_ack(tup->rx_dma_desc);
|
|
|
|
spin_lock_irqsave(&u->lock, flags);
|
|
|
|
|
|
|
|
/* Deactivate flow control to stop sender */
|
|
|
|
if (tup->rts_active)
|
|
|
|
set_rts(tup, false);
|
|
|
|
|
|
|
|
/* If we are here, DMA is stopped */
|
|
|
|
if (count)
|
2013-01-17 13:31:45 +00:00
|
|
|
tegra_uart_copy_rx_to_tty(tup, port, count);
|
2013-01-08 10:57:44 +00:00
|
|
|
|
2013-01-17 13:31:45 +00:00
|
|
|
tegra_uart_handle_rx_pio(tup, port);
|
2013-01-08 10:57:44 +00:00
|
|
|
if (tty) {
|
2013-08-19 14:44:27 +00:00
|
|
|
spin_unlock_irqrestore(&u->lock, flags);
|
2013-01-17 13:31:45 +00:00
|
|
|
tty_flip_buffer_push(port);
|
2013-08-19 14:44:27 +00:00
|
|
|
spin_lock_irqsave(&u->lock, flags);
|
2013-01-08 10:57:44 +00:00
|
|
|
tty_kref_put(tty);
|
|
|
|
}
|
|
|
|
tegra_uart_start_rx_dma(tup);
|
|
|
|
|
|
|
|
/* Activate flow control to start transfer */
|
|
|
|
if (tup->rts_active)
|
|
|
|
set_rts(tup, true);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&u->lock, flags);
|
|
|
|
}
|
|
|
|
|
2013-08-19 14:44:27 +00:00
|
|
|
static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup,
|
|
|
|
unsigned long *flags)
|
2013-01-08 10:57:44 +00:00
|
|
|
{
|
|
|
|
struct dma_tx_state state;
|
|
|
|
struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port);
|
2013-01-17 13:31:45 +00:00
|
|
|
struct tty_port *port = &tup->uport.state->port;
|
2013-08-19 14:44:27 +00:00
|
|
|
struct uart_port *u = &tup->uport;
|
2013-01-08 10:57:44 +00:00
|
|
|
int count;
|
|
|
|
|
|
|
|
/* Deactivate flow control to stop sender */
|
|
|
|
if (tup->rts_active)
|
|
|
|
set_rts(tup, false);
|
|
|
|
|
|
|
|
dmaengine_terminate_all(tup->rx_dma_chan);
|
|
|
|
dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state);
|
2014-06-06 11:18:09 +00:00
|
|
|
async_tx_ack(tup->rx_dma_desc);
|
2013-01-08 10:57:44 +00:00
|
|
|
count = tup->rx_bytes_requested - state.residue;
|
|
|
|
|
|
|
|
/* If we are here, DMA is stopped */
|
|
|
|
if (count)
|
2013-01-17 13:31:45 +00:00
|
|
|
tegra_uart_copy_rx_to_tty(tup, port, count);
|
2013-01-08 10:57:44 +00:00
|
|
|
|
2013-01-17 13:31:45 +00:00
|
|
|
tegra_uart_handle_rx_pio(tup, port);
|
2013-01-08 10:57:44 +00:00
|
|
|
if (tty) {
|
2013-08-19 14:44:27 +00:00
|
|
|
spin_unlock_irqrestore(&u->lock, *flags);
|
2013-01-17 13:31:45 +00:00
|
|
|
tty_flip_buffer_push(port);
|
2013-08-19 14:44:27 +00:00
|
|
|
spin_lock_irqsave(&u->lock, *flags);
|
2013-01-08 10:57:44 +00:00
|
|
|
tty_kref_put(tty);
|
|
|
|
}
|
|
|
|
tegra_uart_start_rx_dma(tup);
|
|
|
|
|
|
|
|
if (tup->rts_active)
|
|
|
|
set_rts(tup, true);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tegra_uart_start_rx_dma(struct tegra_uart_port *tup)
|
|
|
|
{
|
|
|
|
unsigned int count = TEGRA_UART_RX_DMA_BUFFER_SIZE;
|
|
|
|
|
|
|
|
tup->rx_dma_desc = dmaengine_prep_slave_single(tup->rx_dma_chan,
|
|
|
|
tup->rx_dma_buf_phys, count, DMA_DEV_TO_MEM,
|
|
|
|
DMA_PREP_INTERRUPT);
|
|
|
|
if (!tup->rx_dma_desc) {
|
|
|
|
dev_err(tup->uport.dev, "Not able to get desc for Rx\n");
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
tup->rx_dma_desc->callback = tegra_uart_rx_dma_complete;
|
|
|
|
tup->rx_dma_desc->callback_param = tup;
|
|
|
|
dma_sync_single_for_device(tup->uport.dev, tup->rx_dma_buf_phys,
|
|
|
|
count, DMA_TO_DEVICE);
|
|
|
|
tup->rx_bytes_requested = count;
|
|
|
|
tup->rx_cookie = dmaengine_submit(tup->rx_dma_desc);
|
|
|
|
dma_async_issue_pending(tup->rx_dma_chan);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_handle_modem_signal_change(struct uart_port *u)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
|
|
|
unsigned long msr;
|
|
|
|
|
|
|
|
msr = tegra_uart_read(tup, UART_MSR);
|
|
|
|
if (!(msr & UART_MSR_ANY_DELTA))
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (msr & UART_MSR_TERI)
|
|
|
|
tup->uport.icount.rng++;
|
|
|
|
if (msr & UART_MSR_DDSR)
|
|
|
|
tup->uport.icount.dsr++;
|
|
|
|
/* We may only get DDCD when HW init and reset */
|
|
|
|
if (msr & UART_MSR_DDCD)
|
|
|
|
uart_handle_dcd_change(&tup->uport, msr & UART_MSR_DCD);
|
|
|
|
/* Will start/stop_tx accordingly */
|
|
|
|
if (msr & UART_MSR_DCTS)
|
|
|
|
uart_handle_cts_change(&tup->uport, msr & UART_MSR_CTS);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static irqreturn_t tegra_uart_isr(int irq, void *data)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = data;
|
|
|
|
struct uart_port *u = &tup->uport;
|
|
|
|
unsigned long iir;
|
|
|
|
unsigned long ier;
|
|
|
|
bool is_rx_int = false;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&u->lock, flags);
|
|
|
|
while (1) {
|
|
|
|
iir = tegra_uart_read(tup, UART_IIR);
|
|
|
|
if (iir & UART_IIR_NO_INT) {
|
|
|
|
if (is_rx_int) {
|
2013-08-19 14:44:27 +00:00
|
|
|
tegra_uart_handle_rx_dma(tup, &flags);
|
2013-01-08 10:57:44 +00:00
|
|
|
if (tup->rx_in_progress) {
|
|
|
|
ier = tup->ier_shadow;
|
|
|
|
ier |= (UART_IER_RLSI | UART_IER_RTOIE |
|
|
|
|
TEGRA_UART_IER_EORD);
|
|
|
|
tup->ier_shadow = ier;
|
|
|
|
tegra_uart_write(tup, ier, UART_IER);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&u->lock, flags);
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch ((iir >> 1) & 0x7) {
|
|
|
|
case 0: /* Modem signal change interrupt */
|
|
|
|
tegra_uart_handle_modem_signal_change(u);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 1: /* Transmit interrupt only triggered when using PIO */
|
|
|
|
tup->ier_shadow &= ~UART_IER_THRI;
|
|
|
|
tegra_uart_write(tup, tup->ier_shadow, UART_IER);
|
|
|
|
tegra_uart_handle_tx_pio(tup);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 4: /* End of data */
|
|
|
|
case 6: /* Rx timeout */
|
|
|
|
case 2: /* Receive */
|
|
|
|
if (!is_rx_int) {
|
|
|
|
is_rx_int = true;
|
|
|
|
/* Disable Rx interrupts */
|
|
|
|
ier = tup->ier_shadow;
|
|
|
|
ier |= UART_IER_RDI;
|
|
|
|
tegra_uart_write(tup, ier, UART_IER);
|
|
|
|
ier &= ~(UART_IER_RDI | UART_IER_RLSI |
|
|
|
|
UART_IER_RTOIE | TEGRA_UART_IER_EORD);
|
|
|
|
tup->ier_shadow = ier;
|
|
|
|
tegra_uart_write(tup, ier, UART_IER);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 3: /* Receive error */
|
|
|
|
tegra_uart_decode_rx_error(tup,
|
|
|
|
tegra_uart_read(tup, UART_LSR));
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 5: /* break nothing to handle */
|
|
|
|
case 7: /* break nothing to handle */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_stop_rx(struct uart_port *u)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
2013-09-10 10:50:48 +00:00
|
|
|
struct tty_struct *tty;
|
2013-01-17 13:31:45 +00:00
|
|
|
struct tty_port *port = &u->state->port;
|
2013-01-08 10:57:44 +00:00
|
|
|
struct dma_tx_state state;
|
|
|
|
unsigned long ier;
|
|
|
|
int count;
|
|
|
|
|
|
|
|
if (tup->rts_active)
|
|
|
|
set_rts(tup, false);
|
|
|
|
|
|
|
|
if (!tup->rx_in_progress)
|
|
|
|
return;
|
|
|
|
|
2013-09-10 10:50:48 +00:00
|
|
|
tty = tty_port_tty_get(&tup->uport.state->port);
|
|
|
|
|
2013-01-08 10:57:44 +00:00
|
|
|
tegra_uart_wait_sym_time(tup, 1); /* wait a character interval */
|
|
|
|
|
|
|
|
ier = tup->ier_shadow;
|
|
|
|
ier &= ~(UART_IER_RDI | UART_IER_RLSI | UART_IER_RTOIE |
|
|
|
|
TEGRA_UART_IER_EORD);
|
|
|
|
tup->ier_shadow = ier;
|
|
|
|
tegra_uart_write(tup, ier, UART_IER);
|
|
|
|
tup->rx_in_progress = 0;
|
|
|
|
if (tup->rx_dma_chan) {
|
|
|
|
dmaengine_terminate_all(tup->rx_dma_chan);
|
|
|
|
dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state);
|
|
|
|
async_tx_ack(tup->rx_dma_desc);
|
|
|
|
count = tup->rx_bytes_requested - state.residue;
|
2013-01-17 13:31:45 +00:00
|
|
|
tegra_uart_copy_rx_to_tty(tup, port, count);
|
|
|
|
tegra_uart_handle_rx_pio(tup, port);
|
2013-01-08 10:57:44 +00:00
|
|
|
} else {
|
2013-01-17 13:31:45 +00:00
|
|
|
tegra_uart_handle_rx_pio(tup, port);
|
2013-01-08 10:57:44 +00:00
|
|
|
}
|
|
|
|
if (tty) {
|
2013-01-17 13:31:45 +00:00
|
|
|
tty_flip_buffer_push(port);
|
2013-01-08 10:57:44 +00:00
|
|
|
tty_kref_put(tty);
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_hw_deinit(struct tegra_uart_port *tup)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
unsigned long char_time = DIV_ROUND_UP(10000000, tup->current_baud);
|
|
|
|
unsigned long fifo_empty_time = tup->uport.fifosize * char_time;
|
|
|
|
unsigned long wait_time;
|
|
|
|
unsigned long lsr;
|
|
|
|
unsigned long msr;
|
|
|
|
unsigned long mcr;
|
|
|
|
|
|
|
|
/* Disable interrupts */
|
|
|
|
tegra_uart_write(tup, 0, UART_IER);
|
|
|
|
|
|
|
|
lsr = tegra_uart_read(tup, UART_LSR);
|
|
|
|
if ((lsr & UART_LSR_TEMT) != UART_LSR_TEMT) {
|
|
|
|
msr = tegra_uart_read(tup, UART_MSR);
|
|
|
|
mcr = tegra_uart_read(tup, UART_MCR);
|
|
|
|
if ((mcr & TEGRA_UART_MCR_CTS_EN) && (msr & UART_MSR_CTS))
|
|
|
|
dev_err(tup->uport.dev,
|
|
|
|
"Tx Fifo not empty, CTS disabled, waiting\n");
|
|
|
|
|
|
|
|
/* Wait for Tx fifo to be empty */
|
|
|
|
while ((lsr & UART_LSR_TEMT) != UART_LSR_TEMT) {
|
|
|
|
wait_time = min(fifo_empty_time, 100lu);
|
|
|
|
udelay(wait_time);
|
|
|
|
fifo_empty_time -= wait_time;
|
|
|
|
if (!fifo_empty_time) {
|
|
|
|
msr = tegra_uart_read(tup, UART_MSR);
|
|
|
|
mcr = tegra_uart_read(tup, UART_MCR);
|
|
|
|
if ((mcr & TEGRA_UART_MCR_CTS_EN) &&
|
|
|
|
(msr & UART_MSR_CTS))
|
|
|
|
dev_err(tup->uport.dev,
|
|
|
|
"Slave not ready\n");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
lsr = tegra_uart_read(tup, UART_LSR);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock_irqsave(&tup->uport.lock, flags);
|
|
|
|
/* Reset the Rx and Tx FIFOs */
|
|
|
|
tegra_uart_fifo_reset(tup, UART_FCR_CLEAR_XMIT | UART_FCR_CLEAR_RCVR);
|
|
|
|
tup->current_baud = 0;
|
|
|
|
spin_unlock_irqrestore(&tup->uport.lock, flags);
|
|
|
|
|
|
|
|
clk_disable_unprepare(tup->uart_clk);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tegra_uart_hw_init(struct tegra_uart_port *tup)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
tup->fcr_shadow = 0;
|
|
|
|
tup->mcr_shadow = 0;
|
|
|
|
tup->lcr_shadow = 0;
|
|
|
|
tup->ier_shadow = 0;
|
|
|
|
tup->current_baud = 0;
|
|
|
|
|
|
|
|
clk_prepare_enable(tup->uart_clk);
|
|
|
|
|
|
|
|
/* Reset the UART controller to clear all previous status.*/
|
2013-11-06 23:50:44 +00:00
|
|
|
reset_control_assert(tup->rst);
|
2013-01-08 10:57:44 +00:00
|
|
|
udelay(10);
|
2013-11-06 23:50:44 +00:00
|
|
|
reset_control_deassert(tup->rst);
|
2013-01-08 10:57:44 +00:00
|
|
|
|
|
|
|
tup->rx_in_progress = 0;
|
|
|
|
tup->tx_in_progress = 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the trigger level
|
|
|
|
*
|
|
|
|
* For PIO mode:
|
|
|
|
*
|
|
|
|
* For receive, this will interrupt the CPU after that many number of
|
|
|
|
* bytes are received, for the remaining bytes the receive timeout
|
|
|
|
* interrupt is received. Rx high watermark is set to 4.
|
|
|
|
*
|
|
|
|
* For transmit, if the trasnmit interrupt is enabled, this will
|
|
|
|
* interrupt the CPU when the number of entries in the FIFO reaches the
|
|
|
|
* low watermark. Tx low watermark is set to 16 bytes.
|
|
|
|
*
|
|
|
|
* For DMA mode:
|
|
|
|
*
|
|
|
|
* Set the Tx trigger to 16. This should match the DMA burst size that
|
|
|
|
* programmed in the DMA registers.
|
|
|
|
*/
|
|
|
|
tup->fcr_shadow = UART_FCR_ENABLE_FIFO;
|
|
|
|
tup->fcr_shadow |= UART_FCR_R_TRIG_01;
|
|
|
|
tup->fcr_shadow |= TEGRA_UART_TX_TRIG_16B;
|
|
|
|
tegra_uart_write(tup, tup->fcr_shadow, UART_FCR);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialize the UART with default configuration
|
|
|
|
* (115200, N, 8, 1) so that the receive DMA buffer may be
|
|
|
|
* enqueued
|
|
|
|
*/
|
|
|
|
tup->lcr_shadow = TEGRA_UART_DEFAULT_LSR;
|
|
|
|
tegra_set_baudrate(tup, TEGRA_UART_DEFAULT_BAUD);
|
|
|
|
tup->fcr_shadow |= UART_FCR_DMA_SELECT;
|
|
|
|
tegra_uart_write(tup, tup->fcr_shadow, UART_FCR);
|
|
|
|
|
|
|
|
ret = tegra_uart_start_rx_dma(tup);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(tup->uport.dev, "Not able to start Rx DMA\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
tup->rx_in_progress = 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Enable IE_RXS for the receive status interrupts like line errros.
|
|
|
|
* Enable IE_RX_TIMEOUT to get the bytes which cannot be DMA'd.
|
|
|
|
*
|
|
|
|
* If using DMA mode, enable EORD instead of receive interrupt which
|
|
|
|
* will interrupt after the UART is done with the receive instead of
|
|
|
|
* the interrupt when the FIFO "threshold" is reached.
|
|
|
|
*
|
|
|
|
* EORD is different interrupt than RX_TIMEOUT - RX_TIMEOUT occurs when
|
|
|
|
* the DATA is sitting in the FIFO and couldn't be transferred to the
|
|
|
|
* DMA as the DMA size alignment(4 bytes) is not met. EORD will be
|
|
|
|
* triggered when there is a pause of the incomming data stream for 4
|
|
|
|
* characters long.
|
|
|
|
*
|
|
|
|
* For pauses in the data which is not aligned to 4 bytes, we get
|
|
|
|
* both the EORD as well as RX_TIMEOUT - SW sees RX_TIMEOUT first
|
|
|
|
* then the EORD.
|
|
|
|
*/
|
|
|
|
tup->ier_shadow = UART_IER_RLSI | UART_IER_RTOIE | TEGRA_UART_IER_EORD;
|
|
|
|
tegra_uart_write(tup, tup->ier_shadow, UART_IER);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
|
|
|
|
bool dma_to_memory)
|
|
|
|
{
|
|
|
|
struct dma_chan *dma_chan;
|
|
|
|
unsigned char *dma_buf;
|
|
|
|
dma_addr_t dma_phys;
|
|
|
|
int ret;
|
|
|
|
struct dma_slave_config dma_sconfig;
|
|
|
|
|
2013-11-11 21:16:38 +00:00
|
|
|
dma_chan = dma_request_slave_channel_reason(tup->uport.dev,
|
|
|
|
dma_to_memory ? "rx" : "tx");
|
|
|
|
if (IS_ERR(dma_chan)) {
|
|
|
|
ret = PTR_ERR(dma_chan);
|
2013-01-08 10:57:44 +00:00
|
|
|
dev_err(tup->uport.dev,
|
2013-11-11 21:16:38 +00:00
|
|
|
"DMA channel alloc failed: %d\n", ret);
|
|
|
|
return ret;
|
2013-01-08 10:57:44 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if (dma_to_memory) {
|
|
|
|
dma_buf = dma_alloc_coherent(tup->uport.dev,
|
|
|
|
TEGRA_UART_RX_DMA_BUFFER_SIZE,
|
|
|
|
&dma_phys, GFP_KERNEL);
|
|
|
|
if (!dma_buf) {
|
|
|
|
dev_err(tup->uport.dev,
|
|
|
|
"Not able to allocate the dma buffer\n");
|
|
|
|
dma_release_channel(dma_chan);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
dma_phys = dma_map_single(tup->uport.dev,
|
|
|
|
tup->uport.state->xmit.buf, UART_XMIT_SIZE,
|
|
|
|
DMA_TO_DEVICE);
|
|
|
|
dma_buf = tup->uport.state->xmit.buf;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (dma_to_memory) {
|
|
|
|
dma_sconfig.src_addr = tup->uport.mapbase;
|
|
|
|
dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
|
|
|
|
dma_sconfig.src_maxburst = 4;
|
|
|
|
} else {
|
|
|
|
dma_sconfig.dst_addr = tup->uport.mapbase;
|
|
|
|
dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
|
|
|
|
dma_sconfig.dst_maxburst = 16;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = dmaengine_slave_config(dma_chan, &dma_sconfig);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(tup->uport.dev,
|
|
|
|
"Dma slave config failed, err = %d\n", ret);
|
|
|
|
goto scrub;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (dma_to_memory) {
|
|
|
|
tup->rx_dma_chan = dma_chan;
|
|
|
|
tup->rx_dma_buf_virt = dma_buf;
|
|
|
|
tup->rx_dma_buf_phys = dma_phys;
|
|
|
|
} else {
|
|
|
|
tup->tx_dma_chan = dma_chan;
|
|
|
|
tup->tx_dma_buf_virt = dma_buf;
|
|
|
|
tup->tx_dma_buf_phys = dma_phys;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
scrub:
|
|
|
|
dma_release_channel(dma_chan);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_dma_channel_free(struct tegra_uart_port *tup,
|
|
|
|
bool dma_to_memory)
|
|
|
|
{
|
|
|
|
struct dma_chan *dma_chan;
|
|
|
|
|
|
|
|
if (dma_to_memory) {
|
|
|
|
dma_free_coherent(tup->uport.dev, TEGRA_UART_RX_DMA_BUFFER_SIZE,
|
|
|
|
tup->rx_dma_buf_virt, tup->rx_dma_buf_phys);
|
|
|
|
dma_chan = tup->rx_dma_chan;
|
|
|
|
tup->rx_dma_chan = NULL;
|
|
|
|
tup->rx_dma_buf_phys = 0;
|
|
|
|
tup->rx_dma_buf_virt = NULL;
|
|
|
|
} else {
|
|
|
|
dma_unmap_single(tup->uport.dev, tup->tx_dma_buf_phys,
|
|
|
|
UART_XMIT_SIZE, DMA_TO_DEVICE);
|
|
|
|
dma_chan = tup->tx_dma_chan;
|
|
|
|
tup->tx_dma_chan = NULL;
|
|
|
|
tup->tx_dma_buf_phys = 0;
|
|
|
|
tup->tx_dma_buf_virt = NULL;
|
|
|
|
}
|
|
|
|
dma_release_channel(dma_chan);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tegra_uart_startup(struct uart_port *u)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = tegra_uart_dma_channel_allocate(tup, false);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(u->dev, "Tx Dma allocation failed, err = %d\n", ret);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = tegra_uart_dma_channel_allocate(tup, true);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(u->dev, "Rx Dma allocation failed, err = %d\n", ret);
|
|
|
|
goto fail_rx_dma;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = tegra_uart_hw_init(tup);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(u->dev, "Uart HW init failed, err = %d\n", ret);
|
|
|
|
goto fail_hw_init;
|
|
|
|
}
|
|
|
|
|
2013-10-06 06:30:17 +00:00
|
|
|
ret = request_irq(u->irq, tegra_uart_isr, 0,
|
2013-01-08 10:57:44 +00:00
|
|
|
dev_name(u->dev), tup);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(u->dev, "Failed to register ISR for IRQ %d\n", u->irq);
|
|
|
|
goto fail_hw_init;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
fail_hw_init:
|
|
|
|
tegra_uart_dma_channel_free(tup, true);
|
|
|
|
fail_rx_dma:
|
|
|
|
tegra_uart_dma_channel_free(tup, false);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_shutdown(struct uart_port *u)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
|
|
|
|
|
|
|
tegra_uart_hw_deinit(tup);
|
|
|
|
|
|
|
|
tup->rx_in_progress = 0;
|
|
|
|
tup->tx_in_progress = 0;
|
|
|
|
|
|
|
|
tegra_uart_dma_channel_free(tup, true);
|
|
|
|
tegra_uart_dma_channel_free(tup, false);
|
|
|
|
free_irq(u->irq, tup);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_enable_ms(struct uart_port *u)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
|
|
|
|
|
|
|
if (tup->enable_modem_interrupt) {
|
|
|
|
tup->ier_shadow |= UART_IER_MSI;
|
|
|
|
tegra_uart_write(tup, tup->ier_shadow, UART_IER);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void tegra_uart_set_termios(struct uart_port *u,
|
|
|
|
struct ktermios *termios, struct ktermios *oldtermios)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
|
|
|
unsigned int baud;
|
|
|
|
unsigned long flags;
|
|
|
|
unsigned int lcr;
|
|
|
|
int symb_bit = 1;
|
|
|
|
struct clk *parent_clk = clk_get_parent(tup->uart_clk);
|
|
|
|
unsigned long parent_clk_rate = clk_get_rate(parent_clk);
|
|
|
|
int max_divider = (tup->cdata->support_clk_src_div) ? 0x7FFF : 0xFFFF;
|
|
|
|
|
|
|
|
max_divider *= 16;
|
|
|
|
spin_lock_irqsave(&u->lock, flags);
|
|
|
|
|
|
|
|
/* Changing configuration, it is safe to stop any rx now */
|
|
|
|
if (tup->rts_active)
|
|
|
|
set_rts(tup, false);
|
|
|
|
|
|
|
|
/* Clear all interrupts as configuration is going to be change */
|
|
|
|
tegra_uart_write(tup, tup->ier_shadow | UART_IER_RDI, UART_IER);
|
|
|
|
tegra_uart_read(tup, UART_IER);
|
|
|
|
tegra_uart_write(tup, 0, UART_IER);
|
|
|
|
tegra_uart_read(tup, UART_IER);
|
|
|
|
|
|
|
|
/* Parity */
|
|
|
|
lcr = tup->lcr_shadow;
|
|
|
|
lcr &= ~UART_LCR_PARITY;
|
|
|
|
|
|
|
|
/* CMSPAR isn't supported by this driver */
|
|
|
|
termios->c_cflag &= ~CMSPAR;
|
|
|
|
|
|
|
|
if ((termios->c_cflag & PARENB) == PARENB) {
|
|
|
|
symb_bit++;
|
|
|
|
if (termios->c_cflag & PARODD) {
|
|
|
|
lcr |= UART_LCR_PARITY;
|
|
|
|
lcr &= ~UART_LCR_EPAR;
|
|
|
|
lcr &= ~UART_LCR_SPAR;
|
|
|
|
} else {
|
|
|
|
lcr |= UART_LCR_PARITY;
|
|
|
|
lcr |= UART_LCR_EPAR;
|
|
|
|
lcr &= ~UART_LCR_SPAR;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
lcr &= ~UART_LCR_WLEN8;
|
|
|
|
switch (termios->c_cflag & CSIZE) {
|
|
|
|
case CS5:
|
|
|
|
lcr |= UART_LCR_WLEN5;
|
|
|
|
symb_bit += 5;
|
|
|
|
break;
|
|
|
|
case CS6:
|
|
|
|
lcr |= UART_LCR_WLEN6;
|
|
|
|
symb_bit += 6;
|
|
|
|
break;
|
|
|
|
case CS7:
|
|
|
|
lcr |= UART_LCR_WLEN7;
|
|
|
|
symb_bit += 7;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
lcr |= UART_LCR_WLEN8;
|
|
|
|
symb_bit += 8;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Stop bits */
|
|
|
|
if (termios->c_cflag & CSTOPB) {
|
|
|
|
lcr |= UART_LCR_STOP;
|
|
|
|
symb_bit += 2;
|
|
|
|
} else {
|
|
|
|
lcr &= ~UART_LCR_STOP;
|
|
|
|
symb_bit++;
|
|
|
|
}
|
|
|
|
|
|
|
|
tegra_uart_write(tup, lcr, UART_LCR);
|
|
|
|
tup->lcr_shadow = lcr;
|
|
|
|
tup->symb_bit = symb_bit;
|
|
|
|
|
|
|
|
/* Baud rate. */
|
|
|
|
baud = uart_get_baud_rate(u, termios, oldtermios,
|
|
|
|
parent_clk_rate/max_divider,
|
|
|
|
parent_clk_rate/16);
|
|
|
|
spin_unlock_irqrestore(&u->lock, flags);
|
|
|
|
tegra_set_baudrate(tup, baud);
|
|
|
|
if (tty_termios_baud_rate(termios))
|
|
|
|
tty_termios_encode_baud_rate(termios, baud, baud);
|
|
|
|
spin_lock_irqsave(&u->lock, flags);
|
|
|
|
|
|
|
|
/* Flow control */
|
|
|
|
if (termios->c_cflag & CRTSCTS) {
|
|
|
|
tup->mcr_shadow |= TEGRA_UART_MCR_CTS_EN;
|
|
|
|
tup->mcr_shadow &= ~TEGRA_UART_MCR_RTS_EN;
|
|
|
|
tegra_uart_write(tup, tup->mcr_shadow, UART_MCR);
|
|
|
|
/* if top layer has asked to set rts active then do so here */
|
|
|
|
if (tup->rts_active)
|
|
|
|
set_rts(tup, true);
|
|
|
|
} else {
|
|
|
|
tup->mcr_shadow &= ~TEGRA_UART_MCR_CTS_EN;
|
|
|
|
tup->mcr_shadow &= ~TEGRA_UART_MCR_RTS_EN;
|
|
|
|
tegra_uart_write(tup, tup->mcr_shadow, UART_MCR);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* update the port timeout based on new settings */
|
|
|
|
uart_update_timeout(u, termios->c_cflag, baud);
|
|
|
|
|
|
|
|
/* Make sure all write has completed */
|
|
|
|
tegra_uart_read(tup, UART_IER);
|
|
|
|
|
|
|
|
/* Reenable interrupt */
|
|
|
|
tegra_uart_write(tup, tup->ier_shadow, UART_IER);
|
|
|
|
tegra_uart_read(tup, UART_IER);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&u->lock, flags);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Flush any TX data submitted for DMA and PIO. Called when the
|
|
|
|
* TX circular buffer is reset.
|
|
|
|
*/
|
|
|
|
static void tegra_uart_flush_buffer(struct uart_port *u)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = to_tegra_uport(u);
|
|
|
|
|
|
|
|
tup->tx_bytes = 0;
|
|
|
|
if (tup->tx_dma_chan)
|
|
|
|
dmaengine_terminate_all(tup->tx_dma_chan);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const char *tegra_uart_type(struct uart_port *u)
|
|
|
|
{
|
|
|
|
return TEGRA_UART_TYPE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct uart_ops tegra_uart_ops = {
|
|
|
|
.tx_empty = tegra_uart_tx_empty,
|
|
|
|
.set_mctrl = tegra_uart_set_mctrl,
|
|
|
|
.get_mctrl = tegra_uart_get_mctrl,
|
|
|
|
.stop_tx = tegra_uart_stop_tx,
|
|
|
|
.start_tx = tegra_uart_start_tx,
|
|
|
|
.stop_rx = tegra_uart_stop_rx,
|
|
|
|
.flush_buffer = tegra_uart_flush_buffer,
|
|
|
|
.enable_ms = tegra_uart_enable_ms,
|
|
|
|
.break_ctl = tegra_uart_break_ctl,
|
|
|
|
.startup = tegra_uart_startup,
|
|
|
|
.shutdown = tegra_uart_shutdown,
|
|
|
|
.set_termios = tegra_uart_set_termios,
|
|
|
|
.type = tegra_uart_type,
|
|
|
|
.request_port = tegra_uart_request_port,
|
|
|
|
.release_port = tegra_uart_release_port,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct uart_driver tegra_uart_driver = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.driver_name = "tegra_hsuart",
|
|
|
|
.dev_name = "ttyTHS",
|
2013-08-08 08:40:55 +00:00
|
|
|
.cons = NULL,
|
2013-01-08 10:57:44 +00:00
|
|
|
.nr = TEGRA_UART_MAXIMUM,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int tegra_uart_parse_dt(struct platform_device *pdev,
|
|
|
|
struct tegra_uart_port *tup)
|
|
|
|
{
|
|
|
|
struct device_node *np = pdev->dev.of_node;
|
|
|
|
int port;
|
|
|
|
|
|
|
|
port = of_alias_get_id(np, "serial");
|
|
|
|
if (port < 0) {
|
|
|
|
dev_err(&pdev->dev, "failed to get alias id, errno %d\n", port);
|
|
|
|
return port;
|
|
|
|
}
|
|
|
|
tup->uport.line = port;
|
|
|
|
|
|
|
|
tup->enable_modem_interrupt = of_property_read_bool(np,
|
|
|
|
"nvidia,enable-modem-interrupt");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-08-08 08:40:55 +00:00
|
|
|
static struct tegra_uart_chip_data tegra20_uart_chip_data = {
|
2013-01-08 10:57:44 +00:00
|
|
|
.tx_fifo_full_status = false,
|
|
|
|
.allow_txfifo_reset_fifo_mode = true,
|
|
|
|
.support_clk_src_div = false,
|
|
|
|
};
|
|
|
|
|
2013-08-08 08:40:55 +00:00
|
|
|
static struct tegra_uart_chip_data tegra30_uart_chip_data = {
|
2013-01-08 10:57:44 +00:00
|
|
|
.tx_fifo_full_status = true,
|
|
|
|
.allow_txfifo_reset_fifo_mode = false,
|
|
|
|
.support_clk_src_div = true,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct of_device_id tegra_uart_of_match[] = {
|
|
|
|
{
|
|
|
|
.compatible = "nvidia,tegra30-hsuart",
|
|
|
|
.data = &tegra30_uart_chip_data,
|
|
|
|
}, {
|
|
|
|
.compatible = "nvidia,tegra20-hsuart",
|
|
|
|
.data = &tegra20_uart_chip_data,
|
|
|
|
}, {
|
|
|
|
},
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, tegra_uart_of_match);
|
|
|
|
|
|
|
|
static int tegra_uart_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup;
|
|
|
|
struct uart_port *u;
|
|
|
|
struct resource *resource;
|
|
|
|
int ret;
|
|
|
|
const struct tegra_uart_chip_data *cdata;
|
|
|
|
const struct of_device_id *match;
|
|
|
|
|
2013-02-15 22:04:45 +00:00
|
|
|
match = of_match_device(tegra_uart_of_match, &pdev->dev);
|
2013-01-08 10:57:44 +00:00
|
|
|
if (!match) {
|
|
|
|
dev_err(&pdev->dev, "Error: No device match found\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
cdata = match->data;
|
|
|
|
|
|
|
|
tup = devm_kzalloc(&pdev->dev, sizeof(*tup), GFP_KERNEL);
|
|
|
|
if (!tup) {
|
|
|
|
dev_err(&pdev->dev, "Failed to allocate memory for tup\n");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = tegra_uart_parse_dt(pdev, tup);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
u = &tup->uport;
|
|
|
|
u->dev = &pdev->dev;
|
|
|
|
u->ops = &tegra_uart_ops;
|
|
|
|
u->type = PORT_TEGRA;
|
|
|
|
u->fifosize = 32;
|
|
|
|
tup->cdata = cdata;
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, tup);
|
|
|
|
resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
if (!resource) {
|
|
|
|
dev_err(&pdev->dev, "No IO memory resource\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
u->mapbase = resource->start;
|
2013-03-04 04:29:00 +00:00
|
|
|
u->membase = devm_ioremap_resource(&pdev->dev, resource);
|
|
|
|
if (IS_ERR(u->membase))
|
|
|
|
return PTR_ERR(u->membase);
|
2013-01-08 10:57:44 +00:00
|
|
|
|
|
|
|
tup->uart_clk = devm_clk_get(&pdev->dev, NULL);
|
|
|
|
if (IS_ERR(tup->uart_clk)) {
|
|
|
|
dev_err(&pdev->dev, "Couldn't get the clock\n");
|
|
|
|
return PTR_ERR(tup->uart_clk);
|
|
|
|
}
|
|
|
|
|
2013-11-06 23:50:44 +00:00
|
|
|
tup->rst = devm_reset_control_get(&pdev->dev, "serial");
|
|
|
|
if (IS_ERR(tup->rst)) {
|
|
|
|
dev_err(&pdev->dev, "Couldn't get the reset\n");
|
|
|
|
return PTR_ERR(tup->rst);
|
|
|
|
}
|
|
|
|
|
2013-01-08 10:57:44 +00:00
|
|
|
u->iotype = UPIO_MEM32;
|
|
|
|
u->irq = platform_get_irq(pdev, 0);
|
|
|
|
u->regshift = 2;
|
|
|
|
ret = uart_add_one_port(&tegra_uart_driver, u);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(&pdev->dev, "Failed to add uart port, err %d\n", ret);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tegra_uart_remove(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = platform_get_drvdata(pdev);
|
|
|
|
struct uart_port *u = &tup->uport;
|
|
|
|
|
|
|
|
uart_remove_one_port(&tegra_uart_driver, u);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static int tegra_uart_suspend(struct device *dev)
|
|
|
|
{
|
|
|
|
struct tegra_uart_port *tup = dev_get_drvdata(dev);
|
|
|
|
struct uart_port *u = &tup->uport;
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|
|
|
|
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return uart_suspend_port(&tegra_uart_driver, u);
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|
|
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}
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|
|
|
|
|
|
|
static int tegra_uart_resume(struct device *dev)
|
|
|
|
{
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|
|
|
struct tegra_uart_port *tup = dev_get_drvdata(dev);
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|
|
|
struct uart_port *u = &tup->uport;
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|
|
|
|
|
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|
return uart_resume_port(&tegra_uart_driver, u);
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|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static const struct dev_pm_ops tegra_uart_pm_ops = {
|
|
|
|
SET_SYSTEM_SLEEP_PM_OPS(tegra_uart_suspend, tegra_uart_resume)
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct platform_driver tegra_uart_platform_driver = {
|
|
|
|
.probe = tegra_uart_probe,
|
|
|
|
.remove = tegra_uart_remove,
|
|
|
|
.driver = {
|
|
|
|
.name = "serial-tegra",
|
2013-02-15 22:04:45 +00:00
|
|
|
.of_match_table = tegra_uart_of_match,
|
2013-01-08 10:57:44 +00:00
|
|
|
.pm = &tegra_uart_pm_ops,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init tegra_uart_init(void)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = uart_register_driver(&tegra_uart_driver);
|
|
|
|
if (ret < 0) {
|
|
|
|
pr_err("Could not register %s driver\n",
|
|
|
|
tegra_uart_driver.driver_name);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = platform_driver_register(&tegra_uart_platform_driver);
|
|
|
|
if (ret < 0) {
|
2013-05-21 14:13:12 +00:00
|
|
|
pr_err("Uart platform driver register failed, e = %d\n", ret);
|
2013-01-08 10:57:44 +00:00
|
|
|
uart_unregister_driver(&tegra_uart_driver);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit tegra_uart_exit(void)
|
|
|
|
{
|
|
|
|
pr_info("Unloading tegra uart driver\n");
|
|
|
|
platform_driver_unregister(&tegra_uart_platform_driver);
|
|
|
|
uart_unregister_driver(&tegra_uart_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(tegra_uart_init);
|
|
|
|
module_exit(tegra_uart_exit);
|
|
|
|
|
|
|
|
MODULE_ALIAS("platform:serial-tegra");
|
|
|
|
MODULE_DESCRIPTION("High speed UART driver for tegra chipset");
|
|
|
|
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
|
|
|
|
MODULE_LICENSE("GPL v2");
|