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path: root/drivers/tty/serial/serial-tegra.c
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Diffstat (limited to 'drivers/tty/serial/serial-tegra.c')
-rw-r--r--drivers/tty/serial/serial-tegra.c71
1 files changed, 36 insertions, 35 deletions
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index 372de8ade76..d5c2a287b7e 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -26,6 +26,7 @@
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
+#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
@@ -33,6 +34,7 @@
#include <linux/of_device.h>
#include <linux/pagemap.h>
#include <linux/platform_device.h>
+#include <linux/reset.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/serial_core.h>
@@ -43,8 +45,6 @@
#include <linux/tty.h>
#include <linux/tty_flip.h>
-#include <linux/clk/tegra.h>
-
#define TEGRA_UART_TYPE "TEGRA_UART"
#define TX_EMPTY_STATUS (UART_LSR_TEMT | UART_LSR_THRE)
#define BYTES_TO_ALIGN(x) ((unsigned long)(x) & 0x3)
@@ -102,6 +102,7 @@ struct tegra_uart_port {
const struct tegra_uart_chip_data *cdata;
struct clk *uart_clk;
+ struct reset_control *rst;
unsigned int current_baud;
/* Register shadow */
@@ -119,7 +120,6 @@ struct tegra_uart_port {
bool rx_timeout;
int rx_in_progress;
int symb_bit;
- int dma_req_sel;
struct dma_chan *rx_dma_chan;
struct dma_chan *tx_dma_chan;
@@ -570,7 +570,9 @@ static void tegra_uart_rx_dma_complete(void *args)
tegra_uart_handle_rx_pio(tup, port);
if (tty) {
+ spin_unlock_irqrestore(&u->lock, flags);
tty_flip_buffer_push(port);
+ spin_lock_irqsave(&u->lock, flags);
tty_kref_put(tty);
}
tegra_uart_start_rx_dma(tup);
@@ -582,11 +584,13 @@ static void tegra_uart_rx_dma_complete(void *args)
spin_unlock_irqrestore(&u->lock, flags);
}
-static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup)
+static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup,
+ unsigned long *flags)
{
struct dma_tx_state state;
struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port);
struct tty_port *port = &tup->uport.state->port;
+ struct uart_port *u = &tup->uport;
int count;
/* Deactivate flow control to stop sender */
@@ -603,7 +607,9 @@ static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup)
tegra_uart_handle_rx_pio(tup, port);
if (tty) {
+ spin_unlock_irqrestore(&u->lock, *flags);
tty_flip_buffer_push(port);
+ spin_lock_irqsave(&u->lock, *flags);
tty_kref_put(tty);
}
tegra_uart_start_rx_dma(tup);
@@ -670,7 +676,7 @@ static irqreturn_t tegra_uart_isr(int irq, void *data)
iir = tegra_uart_read(tup, UART_IIR);
if (iir & UART_IIR_NO_INT) {
if (is_rx_int) {
- tegra_uart_handle_rx_dma(tup);
+ tegra_uart_handle_rx_dma(tup, &flags);
if (tup->rx_in_progress) {
ier = tup->ier_shadow;
ier |= (UART_IER_RLSI | UART_IER_RTOIE |
@@ -725,7 +731,7 @@ static irqreturn_t tegra_uart_isr(int irq, void *data)
static void tegra_uart_stop_rx(struct uart_port *u)
{
struct tegra_uart_port *tup = to_tegra_uport(u);
- struct tty_struct *tty = tty_port_tty_get(&tup->uport.state->port);
+ struct tty_struct *tty;
struct tty_port *port = &u->state->port;
struct dma_tx_state state;
unsigned long ier;
@@ -737,6 +743,8 @@ static void tegra_uart_stop_rx(struct uart_port *u)
if (!tup->rx_in_progress)
return;
+ tty = tty_port_tty_get(&tup->uport.state->port);
+
tegra_uart_wait_sym_time(tup, 1); /* wait a character interval */
ier = tup->ier_shadow;
@@ -823,9 +831,9 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup)
clk_prepare_enable(tup->uart_clk);
/* Reset the UART controller to clear all previous status.*/
- tegra_periph_reset_assert(tup->uart_clk);
+ reset_control_assert(tup->rst);
udelay(10);
- tegra_periph_reset_deassert(tup->uart_clk);
+ reset_control_deassert(tup->rst);
tup->rx_in_progress = 0;
tup->tx_in_progress = 0;
@@ -901,15 +909,14 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
dma_addr_t dma_phys;
int ret;
struct dma_slave_config dma_sconfig;
- dma_cap_mask_t mask;
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
- dma_chan = dma_request_channel(mask, NULL, NULL);
- if (!dma_chan) {
+ 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);
dev_err(tup->uport.dev,
- "Dma channel is not available, will try later\n");
- return -EPROBE_DEFER;
+ "DMA channel alloc failed: %d\n", ret);
+ return ret;
}
if (dma_to_memory) {
@@ -929,7 +936,6 @@ static int tegra_uart_dma_channel_allocate(struct tegra_uart_port *tup,
dma_buf = tup->uport.state->xmit.buf;
}
- dma_sconfig.slave_id = tup->dma_req_sel;
if (dma_to_memory) {
dma_sconfig.src_addr = tup->uport.mapbase;
dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
@@ -1009,7 +1015,7 @@ static int tegra_uart_startup(struct uart_port *u)
goto fail_hw_init;
}
- ret = request_irq(u->irq, tegra_uart_isr, IRQF_DISABLED,
+ ret = request_irq(u->irq, tegra_uart_isr, 0,
dev_name(u->dev), tup);
if (ret < 0) {
dev_err(u->dev, "Failed to register ISR for IRQ %d\n", u->irq);
@@ -1205,7 +1211,7 @@ static struct uart_driver tegra_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "tegra_hsuart",
.dev_name = "ttyTHS",
- .cons = 0,
+ .cons = NULL,
.nr = TEGRA_UART_MAXIMUM,
};
@@ -1213,17 +1219,8 @@ static int tegra_uart_parse_dt(struct platform_device *pdev,
struct tegra_uart_port *tup)
{
struct device_node *np = pdev->dev.of_node;
- u32 of_dma[2];
int port;
- if (of_property_read_u32_array(np, "nvidia,dma-request-selector",
- of_dma, 2) >= 0) {
- tup->dma_req_sel = of_dma[1];
- } else {
- dev_err(&pdev->dev, "missing dma requestor in device tree\n");
- return -EINVAL;
- }
-
port = of_alias_get_id(np, "serial");
if (port < 0) {
dev_err(&pdev->dev, "failed to get alias id, errno %d\n", port);
@@ -1236,13 +1233,13 @@ static int tegra_uart_parse_dt(struct platform_device *pdev,
return 0;
}
-struct tegra_uart_chip_data tegra20_uart_chip_data = {
+static struct tegra_uart_chip_data tegra20_uart_chip_data = {
.tx_fifo_full_status = false,
.allow_txfifo_reset_fifo_mode = true,
.support_clk_src_div = false,
};
-struct tegra_uart_chip_data tegra30_uart_chip_data = {
+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,
@@ -1301,11 +1298,9 @@ static int tegra_uart_probe(struct platform_device *pdev)
}
u->mapbase = resource->start;
- u->membase = devm_request_and_ioremap(&pdev->dev, resource);
- if (!u->membase) {
- dev_err(&pdev->dev, "memregion/iomap address req failed\n");
- return -EADDRNOTAVAIL;
- }
+ u->membase = devm_ioremap_resource(&pdev->dev, resource);
+ if (IS_ERR(u->membase))
+ return PTR_ERR(u->membase);
tup->uart_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(tup->uart_clk)) {
@@ -1313,6 +1308,12 @@ static int tegra_uart_probe(struct platform_device *pdev)
return PTR_ERR(tup->uart_clk);
}
+ 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);
+ }
+
u->iotype = UPIO_MEM32;
u->irq = platform_get_irq(pdev, 0);
u->regshift = 2;
@@ -1378,7 +1379,7 @@ static int __init tegra_uart_init(void)
ret = platform_driver_register(&tegra_uart_platform_driver);
if (ret < 0) {
- pr_err("Uart platfrom driver register failed, e = %d\n", ret);
+ pr_err("Uart platform driver register failed, e = %d\n", ret);
uart_unregister_driver(&tegra_uart_driver);
return ret;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 23:09:01 +0000