From 1c055e55a242a33e574e48be530e06770a210dcd Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 19 Feb 2024 03:26:26 +0000
Subject: [PATCH] add r8169 read mac form eeprom
---
kernel/drivers/tty/serial/serial-tegra.c | 526 +++++++++++++++++++++++++++++++++++++++++++++++-----------
1 files changed, 424 insertions(+), 102 deletions(-)
diff --git a/kernel/drivers/tty/serial/serial-tegra.c b/kernel/drivers/tty/serial/serial-tegra.c
index af2a29c..fac4d90 100644
--- a/kernel/drivers/tty/serial/serial-tegra.c
+++ b/kernel/drivers/tty/serial/serial-tegra.c
@@ -4,7 +4,7 @@
*
* High-speed serial driver for NVIDIA Tegra SoCs
*
- * Copyright (c) 2012-2013, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2012-2019, NVIDIA CORPORATION. All rights reserved.
*
* Author: Laxman Dewangan <ldewangan@nvidia.com>
*/
@@ -62,7 +62,7 @@
#define TEGRA_UART_TX_TRIG_4B 0x20
#define TEGRA_UART_TX_TRIG_1B 0x30
-#define TEGRA_UART_MAXIMUM 5
+#define TEGRA_UART_MAXIMUM 8
/* Default UART setting when started: 115200 no parity, stop, 8 data bits */
#define TEGRA_UART_DEFAULT_BAUD 115200
@@ -71,6 +71,8 @@
/* Tx transfer mode */
#define TEGRA_TX_PIO 1
#define TEGRA_TX_DMA 2
+
+#define TEGRA_UART_FCR_IIR_FIFO_EN 0x40
/**
* tegra_uart_chip_data: SOC specific data.
@@ -84,6 +86,17 @@
bool tx_fifo_full_status;
bool allow_txfifo_reset_fifo_mode;
bool support_clk_src_div;
+ bool fifo_mode_enable_status;
+ int uart_max_port;
+ int max_dma_burst_bytes;
+ int error_tolerance_low_range;
+ int error_tolerance_high_range;
+};
+
+struct tegra_baud_tolerance {
+ u32 lower_range_baud;
+ u32 upper_range_baud;
+ s32 tolerance;
};
struct tegra_uart_port {
@@ -122,10 +135,19 @@
dma_cookie_t rx_cookie;
unsigned int tx_bytes_requested;
unsigned int rx_bytes_requested;
+ struct tegra_baud_tolerance *baud_tolerance;
+ int n_adjustable_baud_rates;
+ int required_rate;
+ int configured_rate;
+ bool use_rx_pio;
+ bool use_tx_pio;
+ bool rx_dma_active;
};
static void tegra_uart_start_next_tx(struct tegra_uart_port *tup);
static int tegra_uart_start_rx_dma(struct tegra_uart_port *tup);
+static void tegra_uart_dma_channel_free(struct tegra_uart_port *tup,
+ bool dma_to_memory);
static inline unsigned long tegra_uart_read(struct tegra_uart_port *tup,
unsigned long reg)
@@ -192,16 +214,34 @@
}
}
+static void set_loopbk(struct tegra_uart_port *tup, bool active)
+{
+ unsigned long mcr = tup->mcr_shadow;
+
+ if (active)
+ mcr |= UART_MCR_LOOP;
+ else
+ mcr &= ~UART_MCR_LOOP;
+
+ if (mcr != tup->mcr_shadow) {
+ tegra_uart_write(tup, mcr, UART_MCR);
+ tup->mcr_shadow = mcr;
+ }
+}
+
static void tegra_uart_set_mctrl(struct uart_port *u, unsigned int mctrl)
{
struct tegra_uart_port *tup = to_tegra_uport(u);
- int dtr_enable;
+ int enable;
tup->rts_active = !!(mctrl & TIOCM_RTS);
set_rts(tup, tup->rts_active);
- dtr_enable = !!(mctrl & TIOCM_DTR);
- set_dtr(tup, dtr_enable);
+ enable = !!(mctrl & TIOCM_DTR);
+ set_dtr(tup, enable);
+
+ enable = !!(mctrl & TIOCM_LOOP);
+ set_loopbk(tup, enable);
}
static void tegra_uart_break_ctl(struct uart_port *u, int break_ctl)
@@ -243,9 +283,28 @@
tup->current_baud));
}
+static int tegra_uart_wait_fifo_mode_enabled(struct tegra_uart_port *tup)
+{
+ unsigned long iir;
+ unsigned int tmout = 100;
+
+ do {
+ iir = tegra_uart_read(tup, UART_IIR);
+ if (iir & TEGRA_UART_FCR_IIR_FIFO_EN)
+ return 0;
+ udelay(1);
+ } while (--tmout);
+
+ return -ETIMEDOUT;
+}
+
static void tegra_uart_fifo_reset(struct tegra_uart_port *tup, u8 fcr_bits)
{
unsigned long fcr = tup->fcr_shadow;
+ unsigned int lsr, tmout = 10000;
+
+ if (tup->rts_active)
+ set_rts(tup, false);
if (tup->cdata->allow_txfifo_reset_fifo_mode) {
fcr |= fcr_bits & (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
@@ -258,6 +317,8 @@
tegra_uart_write(tup, fcr, UART_FCR);
fcr |= UART_FCR_ENABLE_FIFO;
tegra_uart_write(tup, fcr, UART_FCR);
+ if (tup->cdata->fifo_mode_enable_status)
+ tegra_uart_wait_fifo_mode_enabled(tup);
}
/* Dummy read to ensure the write is posted */
@@ -269,6 +330,47 @@
* to propagate, otherwise data could be lost.
*/
tegra_uart_wait_cycle_time(tup, 32);
+
+ do {
+ lsr = tegra_uart_read(tup, UART_LSR);
+ if ((lsr & UART_LSR_TEMT) && !(lsr & UART_LSR_DR))
+ break;
+ udelay(1);
+ } while (--tmout);
+
+ if (tup->rts_active)
+ set_rts(tup, true);
+}
+
+static long tegra_get_tolerance_rate(struct tegra_uart_port *tup,
+ unsigned int baud, long rate)
+{
+ int i;
+
+ for (i = 0; i < tup->n_adjustable_baud_rates; ++i) {
+ if (baud >= tup->baud_tolerance[i].lower_range_baud &&
+ baud <= tup->baud_tolerance[i].upper_range_baud)
+ return (rate + (rate *
+ tup->baud_tolerance[i].tolerance) / 10000);
+ }
+
+ return rate;
+}
+
+static int tegra_check_rate_in_range(struct tegra_uart_port *tup)
+{
+ long diff;
+
+ diff = ((long)(tup->configured_rate - tup->required_rate) * 10000)
+ / tup->required_rate;
+ if (diff < (tup->cdata->error_tolerance_low_range * 100) ||
+ diff > (tup->cdata->error_tolerance_high_range * 100)) {
+ dev_err(tup->uport.dev,
+ "configured baud rate is out of range by %ld", diff);
+ return -EIO;
+ }
+
+ return 0;
}
static int tegra_set_baudrate(struct tegra_uart_port *tup, unsigned int baud)
@@ -276,6 +378,7 @@
unsigned long rate;
unsigned int divisor;
unsigned long lcr;
+ unsigned long flags;
int ret;
if (tup->current_baud == baud)
@@ -283,18 +386,28 @@
if (tup->cdata->support_clk_src_div) {
rate = baud * 16;
+ tup->required_rate = rate;
+
+ if (tup->n_adjustable_baud_rates)
+ rate = tegra_get_tolerance_rate(tup, baud, rate);
+
ret = clk_set_rate(tup->uart_clk, rate);
if (ret < 0) {
dev_err(tup->uport.dev,
"clk_set_rate() failed for rate %lu\n", rate);
return ret;
}
+ tup->configured_rate = clk_get_rate(tup->uart_clk);
divisor = 1;
+ ret = tegra_check_rate_in_range(tup);
+ if (ret < 0)
+ return ret;
} else {
rate = clk_get_rate(tup->uart_clk);
divisor = DIV_ROUND_CLOSEST(rate, baud * 16);
}
+ spin_lock_irqsave(&tup->uport.lock, flags);
lcr = tup->lcr_shadow;
lcr |= UART_LCR_DLAB;
tegra_uart_write(tup, lcr, UART_LCR);
@@ -307,6 +420,7 @@
/* Dummy read to ensure the write is posted */
tegra_uart_read(tup, UART_SCR);
+ spin_unlock_irqrestore(&tup->uport.lock, flags);
tup->current_baud = baud;
@@ -325,24 +439,32 @@
/* Overrrun error */
flag = TTY_OVERRUN;
tup->uport.icount.overrun++;
- dev_err(tup->uport.dev, "Got overrun errors\n");
+ dev_dbg(tup->uport.dev, "Got overrun errors\n");
} else if (lsr & UART_LSR_PE) {
/* Parity error */
flag = TTY_PARITY;
tup->uport.icount.parity++;
- dev_err(tup->uport.dev, "Got Parity errors\n");
+ dev_dbg(tup->uport.dev, "Got Parity errors\n");
} else if (lsr & UART_LSR_FE) {
flag = TTY_FRAME;
tup->uport.icount.frame++;
- dev_err(tup->uport.dev, "Got frame errors\n");
+ dev_dbg(tup->uport.dev, "Got frame errors\n");
} else if (lsr & UART_LSR_BI) {
- dev_err(tup->uport.dev, "Got Break\n");
- tup->uport.icount.brk++;
- /* If FIFO read error without any data, reset Rx FIFO */
+ /*
+ * Break error
+ * If FIFO read error without any data, reset Rx FIFO
+ */
if (!(lsr & UART_LSR_DR) && (lsr & UART_LSR_FIFOE))
tegra_uart_fifo_reset(tup, UART_FCR_CLEAR_RCVR);
+ if (tup->uport.ignore_status_mask & UART_LSR_BI)
+ return TTY_BREAK;
+ flag = TTY_BREAK;
+ tup->uport.icount.brk++;
+ dev_dbg(tup->uport.dev, "Got Break\n");
}
+ uart_insert_char(&tup->uport, lsr, UART_LSR_OE, 0, flag);
}
+
return flag;
}
@@ -398,7 +520,7 @@
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);
+ uart_xmit_advance(&tup->uport, count);
tup->tx_in_progress = 0;
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&tup->uport);
@@ -412,11 +534,12 @@
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;
+
+ dma_sync_single_for_device(tup->uport.dev, tx_phys_addr,
+ tup->tx_bytes, DMA_TO_DEVICE);
+
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);
@@ -440,12 +563,15 @@
unsigned long count;
struct circ_buf *xmit = &tup->uport.state->xmit;
+ if (!tup->current_baud)
+ return;
+
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)
+ if (tup->use_tx_pio || 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));
@@ -482,18 +608,18 @@
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;
unsigned int count;
if (tup->tx_in_progress != TEGRA_UART_TX_DMA)
return;
- dmaengine_terminate_all(tup->tx_dma_chan);
+ dmaengine_pause(tup->tx_dma_chan);
dmaengine_tx_status(tup->tx_dma_chan, tup->tx_cookie, &state);
+ dmaengine_terminate_all(tup->tx_dma_chan);
count = tup->tx_bytes_requested - state.residue;
async_tx_ack(tup->tx_dma_desc);
- xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
+ uart_xmit_advance(&tup->uport, count);
tup->tx_in_progress = 0;
}
@@ -509,7 +635,7 @@
}
static void tegra_uart_handle_rx_pio(struct tegra_uart_port *tup,
- struct tty_port *tty)
+ struct tty_port *port)
{
do {
char flag = TTY_NORMAL;
@@ -521,16 +647,24 @@
break;
flag = tegra_uart_decode_rx_error(tup, lsr);
+ if (flag != TTY_NORMAL)
+ continue;
+
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);
+ if (uart_handle_sysrq_char(&tup->uport, ch))
+ continue;
+
+ if (tup->uport.ignore_status_mask & UART_LSR_DR)
+ continue;
+
+ tty_insert_flip_char(port, ch, flag);
} while (1);
}
static void tegra_uart_copy_rx_to_tty(struct tegra_uart_port *tup,
- struct tty_port *tty,
+ struct tty_port *port,
unsigned int count)
{
int copied;
@@ -540,27 +674,38 @@
return;
tup->uport.icount.rx += count;
- if (!tty) {
- dev_err(tup->uport.dev, "No tty port\n");
+
+ if (tup->uport.ignore_status_mask & UART_LSR_DR)
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,
+ count, DMA_FROM_DEVICE);
+ copied = tty_insert_flip_string(port,
((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);
+ count, DMA_TO_DEVICE);
+}
+
+static void do_handle_rx_pio(struct tegra_uart_port *tup)
+{
+ struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port);
+ struct tty_port *port = &tup->uport.state->port;
+
+ tegra_uart_handle_rx_pio(tup, port);
+ if (tty) {
+ tty_flip_buffer_push(port);
+ tty_kref_put(tty);
+ }
}
static void tegra_uart_rx_buffer_push(struct tegra_uart_port *tup,
unsigned int residue)
{
struct tty_port *port = &tup->uport.state->port;
- struct tty_struct *tty = tty_port_tty_get(port);
unsigned int count;
async_tx_ack(tup->rx_dma_desc);
@@ -569,11 +714,7 @@
/* If we are here, DMA is stopped */
tegra_uart_copy_rx_to_tty(tup, port, count);
- tegra_uart_handle_rx_pio(tup, port);
- if (tty) {
- tty_flip_buffer_push(port);
- tty_kref_put(tty);
- }
+ do_handle_rx_pio(tup);
}
static void tegra_uart_rx_dma_complete(void *args)
@@ -597,6 +738,7 @@
if (tup->rts_active)
set_rts(tup, false);
+ tup->rx_dma_active = false;
tegra_uart_rx_buffer_push(tup, 0);
tegra_uart_start_rx_dma(tup);
@@ -608,18 +750,30 @@
spin_unlock_irqrestore(&u->lock, flags);
}
-static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup)
+static void tegra_uart_terminate_rx_dma(struct tegra_uart_port *tup)
{
struct dma_tx_state state;
+ if (!tup->rx_dma_active) {
+ do_handle_rx_pio(tup);
+ return;
+ }
+
+ dmaengine_pause(tup->rx_dma_chan);
+ dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state);
+ dmaengine_terminate_all(tup->rx_dma_chan);
+
+ tegra_uart_rx_buffer_push(tup, state.residue);
+ tup->rx_dma_active = false;
+}
+
+static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup)
+{
/* 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);
- tegra_uart_rx_buffer_push(tup, state.residue);
- tegra_uart_start_rx_dma(tup);
+ tegra_uart_terminate_rx_dma(tup);
if (tup->rts_active)
set_rts(tup, true);
@@ -629,6 +783,9 @@
{
unsigned int count = TEGRA_UART_RX_DMA_BUFFER_SIZE;
+ if (tup->rx_dma_active)
+ return 0;
+
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);
@@ -637,10 +794,9 @@
return -EIO;
}
+ tup->rx_dma_active = true;
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);
@@ -674,6 +830,7 @@
struct uart_port *u = &tup->uport;
unsigned long iir;
unsigned long ier;
+ bool is_rx_start = false;
bool is_rx_int = false;
unsigned long flags;
@@ -681,15 +838,17 @@
while (1) {
iir = tegra_uart_read(tup, UART_IIR);
if (iir & UART_IIR_NO_INT) {
- if (is_rx_int) {
+ if (!tup->use_rx_pio && is_rx_int) {
tegra_uart_handle_rx_dma(tup);
if (tup->rx_in_progress) {
ier = tup->ier_shadow;
ier |= (UART_IER_RLSI | UART_IER_RTOIE |
- TEGRA_UART_IER_EORD);
+ TEGRA_UART_IER_EORD | UART_IER_RDI);
tup->ier_shadow = ier;
tegra_uart_write(tup, ier, UART_IER);
}
+ } else if (is_rx_start) {
+ tegra_uart_start_rx_dma(tup);
}
spin_unlock_irqrestore(&u->lock, flags);
return IRQ_HANDLED;
@@ -708,17 +867,25 @@
case 4: /* End of data */
case 6: /* Rx timeout */
- case 2: /* Receive */
- if (!is_rx_int) {
- is_rx_int = true;
+ if (!tup->use_rx_pio) {
+ is_rx_int = tup->rx_in_progress;
/* 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;
+ }
+ fallthrough;
+ case 2: /* Receive */
+ if (!tup->use_rx_pio) {
+ is_rx_start = tup->rx_in_progress;
+ tup->ier_shadow &= ~UART_IER_RDI;
+ tegra_uart_write(tup, tup->ier_shadow,
+ UART_IER);
+ } else {
+ do_handle_rx_pio(tup);
}
break;
@@ -737,7 +904,7 @@
static void tegra_uart_stop_rx(struct uart_port *u)
{
struct tegra_uart_port *tup = to_tegra_uport(u);
- struct dma_tx_state state;
+ struct tty_port *port = &tup->uport.state->port;
unsigned long ier;
if (tup->rts_active)
@@ -746,7 +913,7 @@
if (!tup->rx_in_progress)
return;
- tegra_uart_wait_sym_time(tup, 1); /* wait a character interval */
+ tegra_uart_wait_sym_time(tup, 1); /* wait one character interval */
ier = tup->ier_shadow;
ier &= ~(UART_IER_RDI | UART_IER_RLSI | UART_IER_RTOIE |
@@ -754,9 +921,11 @@
tup->ier_shadow = ier;
tegra_uart_write(tup, ier, UART_IER);
tup->rx_in_progress = 0;
- dmaengine_terminate_all(tup->rx_dma_chan);
- dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state);
- tegra_uart_rx_buffer_push(tup, state.residue);
+
+ if (!tup->use_rx_pio)
+ tegra_uart_terminate_rx_dma(tup);
+ else
+ tegra_uart_handle_rx_pio(tup, port);
}
static void tegra_uart_hw_deinit(struct tegra_uart_port *tup)
@@ -804,6 +973,14 @@
tup->current_baud = 0;
spin_unlock_irqrestore(&tup->uport.lock, flags);
+ tup->rx_in_progress = 0;
+ tup->tx_in_progress = 0;
+
+ if (!tup->use_rx_pio)
+ tegra_uart_dma_channel_free(tup, true);
+ if (!tup->use_tx_pio)
+ tegra_uart_dma_channel_free(tup, false);
+
clk_disable_unprepare(tup->uart_clk);
}
@@ -817,7 +994,11 @@
tup->ier_shadow = 0;
tup->current_baud = 0;
- clk_prepare_enable(tup->uart_clk);
+ ret = clk_prepare_enable(tup->uart_clk);
+ if (ret) {
+ dev_err(tup->uport.dev, "could not enable clk\n");
+ return ret;
+ }
/* Reset the UART controller to clear all previous status.*/
reset_control_assert(tup->rst);
@@ -846,34 +1027,55 @@
* programmed in the DMA registers.
*/
tup->fcr_shadow = UART_FCR_ENABLE_FIFO;
- tup->fcr_shadow |= UART_FCR_R_TRIG_01;
+
+ if (tup->use_rx_pio) {
+ tup->fcr_shadow |= UART_FCR_R_TRIG_11;
+ } else {
+ if (tup->cdata->max_dma_burst_bytes == 8)
+ tup->fcr_shadow |= UART_FCR_R_TRIG_10;
+ else
+ 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);
/* Dummy read to ensure the write is posted */
tegra_uart_read(tup, UART_SCR);
- /*
- * For all tegra devices (up to t210), there is a hardware issue that
- * requires software to wait for 3 UART clock periods after enabling
- * the TX fifo, otherwise data could be lost.
- */
- tegra_uart_wait_cycle_time(tup, 3);
+ if (tup->cdata->fifo_mode_enable_status) {
+ ret = tegra_uart_wait_fifo_mode_enabled(tup);
+ if (ret < 0) {
+ dev_err(tup->uport.dev,
+ "Failed to enable FIFO mode: %d\n", ret);
+ return ret;
+ }
+ } else {
+ /*
+ * For all tegra devices (up to t210), there is a hardware
+ * issue that requires software to wait for 3 UART clock
+ * periods after enabling the TX fifo, otherwise data could
+ * be lost.
+ */
+ tegra_uart_wait_cycle_time(tup, 3);
+ }
/*
* 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);
+ ret = tegra_set_baudrate(tup, TEGRA_UART_DEFAULT_BAUD);
if (ret < 0) {
- dev_err(tup->uport.dev, "Not able to start Rx DMA\n");
+ dev_err(tup->uport.dev, "Failed to set baud rate\n");
return ret;
+ }
+ if (!tup->use_rx_pio) {
+ tup->lcr_shadow = TEGRA_UART_DEFAULT_LSR;
+ tup->fcr_shadow |= UART_FCR_DMA_SELECT;
+ tegra_uart_write(tup, tup->fcr_shadow, UART_FCR);
+ } else {
+ tegra_uart_write(tup, tup->fcr_shadow, UART_FCR);
}
tup->rx_in_progress = 1;
@@ -881,13 +1083,9 @@
* 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
+ * 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.
*
@@ -895,7 +1093,15 @@
* 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;
+ tup->ier_shadow = UART_IER_RLSI | UART_IER_RTOIE | UART_IER_RDI;
+
+ /*
+ * If using DMA mode, enable EORD interrupt to notify about RX
+ * completion.
+ */
+ if (!tup->use_rx_pio)
+ tup->ier_shadow |= TEGRA_UART_IER_EORD;
+
tegra_uart_write(tup, tup->ier_shadow, UART_IER);
return 0;
}
@@ -931,8 +1137,7 @@
int ret;
struct dma_slave_config dma_sconfig;
- dma_chan = dma_request_slave_channel_reason(tup->uport.dev,
- dma_to_memory ? "rx" : "tx");
+ dma_chan = dma_request_chan(tup->uport.dev, dma_to_memory ? "rx" : "tx");
if (IS_ERR(dma_chan)) {
ret = PTR_ERR(dma_chan);
dev_err(tup->uport.dev,
@@ -950,9 +1155,12 @@
dma_release_channel(dma_chan);
return -ENOMEM;
}
+ dma_sync_single_for_device(tup->uport.dev, dma_phys,
+ TEGRA_UART_RX_DMA_BUFFER_SIZE,
+ DMA_TO_DEVICE);
dma_sconfig.src_addr = tup->uport.mapbase;
dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- dma_sconfig.src_maxburst = 4;
+ dma_sconfig.src_maxburst = tup->cdata->max_dma_burst_bytes;
tup->rx_dma_chan = dma_chan;
tup->rx_dma_buf_virt = dma_buf;
tup->rx_dma_buf_phys = dma_phys;
@@ -990,16 +1198,22 @@
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;
+ if (!tup->use_tx_pio) {
+ 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;
+ if (!tup->use_rx_pio) {
+ 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);
@@ -1017,9 +1231,11 @@
return 0;
fail_hw_init:
- tegra_uart_dma_channel_free(tup, true);
+ if (!tup->use_rx_pio)
+ tegra_uart_dma_channel_free(tup, true);
fail_rx_dma:
- tegra_uart_dma_channel_free(tup, false);
+ if (!tup->use_tx_pio)
+ tegra_uart_dma_channel_free(tup, false);
return ret;
}
@@ -1041,12 +1257,6 @@
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);
}
@@ -1071,6 +1281,7 @@
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;
+ int ret;
max_divider *= 16;
spin_lock_irqsave(&u->lock, flags);
@@ -1079,7 +1290,7 @@
if (tup->rts_active)
set_rts(tup, false);
- /* Clear all interrupts as configuration is going to be change */
+ /* Clear all interrupts as configuration is going to be changed */
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);
@@ -1143,7 +1354,11 @@
parent_clk_rate/max_divider,
parent_clk_rate/16);
spin_unlock_irqrestore(&u->lock, flags);
- tegra_set_baudrate(tup, baud);
+ ret = tegra_set_baudrate(tup, baud);
+ if (ret < 0) {
+ dev_err(tup->uport.dev, "Failed to set baud rate\n");
+ return;
+ }
if (tty_termios_baud_rate(termios))
tty_termios_encode_baud_rate(termios, baud, baud);
spin_lock_irqsave(&u->lock, flags);
@@ -1165,12 +1380,19 @@
/* update the port timeout based on new settings */
uart_update_timeout(u, termios->c_cflag, baud);
- /* Make sure all write has completed */
+ /* Make sure all writes have completed */
tegra_uart_read(tup, UART_IER);
- /* Reenable interrupt */
+ /* Re-enable interrupt */
tegra_uart_write(tup, tup->ier_shadow, UART_IER);
tegra_uart_read(tup, UART_IER);
+
+ tup->uport.ignore_status_mask = 0;
+ /* Ignore all characters if CREAD is not set */
+ if ((termios->c_cflag & CREAD) == 0)
+ tup->uport.ignore_status_mask |= UART_LSR_DR;
+ if (termios->c_iflag & IGNBRK)
+ tup->uport.ignore_status_mask |= UART_LSR_BI;
spin_unlock_irqrestore(&u->lock, flags);
}
@@ -1211,6 +1433,11 @@
{
struct device_node *np = pdev->dev.of_node;
int port;
+ int ret;
+ int index;
+ u32 pval;
+ int count;
+ int n_entries;
port = of_alias_get_id(np, "serial");
if (port < 0) {
@@ -1221,6 +1448,54 @@
tup->enable_modem_interrupt = of_property_read_bool(np,
"nvidia,enable-modem-interrupt");
+
+ index = of_property_match_string(np, "dma-names", "rx");
+ if (index < 0) {
+ tup->use_rx_pio = true;
+ dev_info(&pdev->dev, "RX in PIO mode\n");
+ }
+ index = of_property_match_string(np, "dma-names", "tx");
+ if (index < 0) {
+ tup->use_tx_pio = true;
+ dev_info(&pdev->dev, "TX in PIO mode\n");
+ }
+
+ n_entries = of_property_count_u32_elems(np, "nvidia,adjust-baud-rates");
+ if (n_entries > 0) {
+ tup->n_adjustable_baud_rates = n_entries / 3;
+ tup->baud_tolerance =
+ devm_kzalloc(&pdev->dev, (tup->n_adjustable_baud_rates) *
+ sizeof(*tup->baud_tolerance), GFP_KERNEL);
+ if (!tup->baud_tolerance)
+ return -ENOMEM;
+ for (count = 0, index = 0; count < n_entries; count += 3,
+ index++) {
+ ret =
+ of_property_read_u32_index(np,
+ "nvidia,adjust-baud-rates",
+ count, &pval);
+ if (!ret)
+ tup->baud_tolerance[index].lower_range_baud =
+ pval;
+ ret =
+ of_property_read_u32_index(np,
+ "nvidia,adjust-baud-rates",
+ count + 1, &pval);
+ if (!ret)
+ tup->baud_tolerance[index].upper_range_baud =
+ pval;
+ ret =
+ of_property_read_u32_index(np,
+ "nvidia,adjust-baud-rates",
+ count + 2, &pval);
+ if (!ret)
+ tup->baud_tolerance[index].tolerance =
+ (s32)pval;
+ }
+ } else {
+ tup->n_adjustable_baud_rates = 0;
+ }
+
return 0;
}
@@ -1228,12 +1503,44 @@
.tx_fifo_full_status = false,
.allow_txfifo_reset_fifo_mode = true,
.support_clk_src_div = false,
+ .fifo_mode_enable_status = false,
+ .uart_max_port = 5,
+ .max_dma_burst_bytes = 4,
+ .error_tolerance_low_range = -4,
+ .error_tolerance_high_range = 4,
};
static struct tegra_uart_chip_data tegra30_uart_chip_data = {
.tx_fifo_full_status = true,
.allow_txfifo_reset_fifo_mode = false,
.support_clk_src_div = true,
+ .fifo_mode_enable_status = false,
+ .uart_max_port = 5,
+ .max_dma_burst_bytes = 4,
+ .error_tolerance_low_range = -4,
+ .error_tolerance_high_range = 4,
+};
+
+static struct tegra_uart_chip_data tegra186_uart_chip_data = {
+ .tx_fifo_full_status = true,
+ .allow_txfifo_reset_fifo_mode = false,
+ .support_clk_src_div = true,
+ .fifo_mode_enable_status = true,
+ .uart_max_port = 8,
+ .max_dma_burst_bytes = 8,
+ .error_tolerance_low_range = 0,
+ .error_tolerance_high_range = 4,
+};
+
+static struct tegra_uart_chip_data tegra194_uart_chip_data = {
+ .tx_fifo_full_status = true,
+ .allow_txfifo_reset_fifo_mode = false,
+ .support_clk_src_div = true,
+ .fifo_mode_enable_status = true,
+ .uart_max_port = 8,
+ .max_dma_burst_bytes = 8,
+ .error_tolerance_low_range = -2,
+ .error_tolerance_high_range = 2,
};
static const struct of_device_id tegra_uart_of_match[] = {
@@ -1243,6 +1550,12 @@
}, {
.compatible = "nvidia,tegra20-hsuart",
.data = &tegra20_uart_chip_data,
+ }, {
+ .compatible = "nvidia,tegra186-hsuart",
+ .data = &tegra186_uart_chip_data,
+ }, {
+ .compatible = "nvidia,tegra194-hsuart",
+ .data = &tegra194_uart_chip_data,
}, {
},
};
@@ -1307,10 +1620,8 @@
u->iotype = UPIO_MEM32;
ret = platform_get_irq(pdev, 0);
- if (ret < 0) {
- dev_err(&pdev->dev, "Couldn't get IRQ\n");
+ if (ret < 0)
return ret;
- }
u->irq = ret;
u->regshift = 2;
ret = uart_add_one_port(&tegra_uart_driver, u);
@@ -1365,11 +1676,22 @@
static int __init tegra_uart_init(void)
{
int ret;
+ struct device_node *node;
+ const struct of_device_id *match = NULL;
+ const struct tegra_uart_chip_data *cdata = NULL;
+
+ node = of_find_matching_node(NULL, tegra_uart_of_match);
+ if (node)
+ match = of_match_node(tegra_uart_of_match, node);
+ if (match)
+ cdata = match->data;
+ if (cdata)
+ tegra_uart_driver.nr = cdata->uart_max_port;
ret = uart_register_driver(&tegra_uart_driver);
if (ret < 0) {
pr_err("Could not register %s driver\n",
- tegra_uart_driver.driver_name);
+ tegra_uart_driver.driver_name);
return ret;
}
--
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