aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/tty/serial/samsung_tty.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/tty/serial/samsung_tty.c')
-rw-r--r--drivers/tty/serial/samsung_tty.c95
1 files changed, 71 insertions, 24 deletions
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 9fbc61151c2e..e2f49863e9c2 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -65,6 +65,7 @@ enum s3c24xx_port_type {
struct s3c24xx_uart_info {
char *name;
enum s3c24xx_port_type type;
+ unsigned int has_usi;
unsigned int port_type;
unsigned int fifosize;
unsigned long rx_fifomask;
@@ -305,8 +306,9 @@ static void s3c24xx_serial_stop_tx(struct uart_port *port)
dmaengine_pause(dma->tx_chan);
dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
dmaengine_terminate_all(dma->tx_chan);
- dma_sync_single_for_cpu(ourport->port.dev,
- dma->tx_transfer_addr, dma->tx_size, DMA_TO_DEVICE);
+ dma_sync_single_for_cpu(dma->tx_chan->device->dev,
+ dma->tx_transfer_addr, dma->tx_size,
+ DMA_TO_DEVICE);
async_tx_ack(dma->tx_desc);
count = dma->tx_bytes_requested - state.residue;
xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
@@ -338,8 +340,9 @@ static void s3c24xx_serial_tx_dma_complete(void *args)
count = dma->tx_bytes_requested - state.residue;
async_tx_ack(dma->tx_desc);
- dma_sync_single_for_cpu(ourport->port.dev, dma->tx_transfer_addr,
- dma->tx_size, DMA_TO_DEVICE);
+ dma_sync_single_for_cpu(dma->tx_chan->device->dev,
+ dma->tx_transfer_addr, dma->tx_size,
+ DMA_TO_DEVICE);
spin_lock_irqsave(&port->lock, flags);
@@ -443,8 +446,9 @@ static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
- dma_sync_single_for_device(ourport->port.dev, dma->tx_transfer_addr,
- dma->tx_size, DMA_TO_DEVICE);
+ dma_sync_single_for_device(dma->tx_chan->device->dev,
+ dma->tx_transfer_addr, dma->tx_size,
+ DMA_TO_DEVICE);
dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
dma->tx_transfer_addr, dma->tx_size,
@@ -515,7 +519,7 @@ static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
if (!count)
return;
- dma_sync_single_for_cpu(ourport->port.dev, dma->rx_addr,
+ dma_sync_single_for_cpu(dma->rx_chan->device->dev, dma->rx_addr,
dma->rx_size, DMA_FROM_DEVICE);
ourport->port.icount.rx += count;
@@ -636,8 +640,8 @@ static void s3c64xx_start_rx_dma(struct s3c24xx_uart_port *ourport)
{
struct s3c24xx_uart_dma *dma = ourport->dma;
- dma_sync_single_for_device(ourport->port.dev, dma->rx_addr,
- dma->rx_size, DMA_FROM_DEVICE);
+ dma_sync_single_for_device(dma->rx_chan->device->dev, dma->rx_addr,
+ dma->rx_size, DMA_FROM_DEVICE);
dma->rx_desc = dmaengine_prep_slave_single(dma->rx_chan,
dma->rx_addr, dma->rx_size, DMA_DEV_TO_MEM,
@@ -1102,18 +1106,19 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
goto err_release_tx;
}
- dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf,
- dma->rx_size, DMA_FROM_DEVICE);
- if (dma_mapping_error(p->port.dev, dma->rx_addr)) {
+ dma->rx_addr = dma_map_single(dma->rx_chan->device->dev, dma->rx_buf,
+ dma->rx_size, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dma->rx_chan->device->dev, dma->rx_addr)) {
reason = "DMA mapping error for RX buffer";
ret = -EIO;
goto err_free_rx;
}
/* TX buffer */
- dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf,
- UART_XMIT_SIZE, DMA_TO_DEVICE);
- if (dma_mapping_error(p->port.dev, dma->tx_addr)) {
+ dma->tx_addr = dma_map_single(dma->tx_chan->device->dev,
+ p->port.state->xmit.buf, UART_XMIT_SIZE,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(dma->tx_chan->device->dev, dma->tx_addr)) {
reason = "DMA mapping error for TX buffer";
ret = -EIO;
goto err_unmap_rx;
@@ -1122,8 +1127,8 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p)
return 0;
err_unmap_rx:
- dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size,
- DMA_FROM_DEVICE);
+ dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
+ dma->rx_size, DMA_FROM_DEVICE);
err_free_rx:
kfree(dma->rx_buf);
err_release_tx:
@@ -1142,8 +1147,8 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
if (dma->rx_chan) {
dmaengine_terminate_all(dma->rx_chan);
- dma_unmap_single(p->port.dev, dma->rx_addr,
- dma->rx_size, DMA_FROM_DEVICE);
+ dma_unmap_single(dma->rx_chan->device->dev, dma->rx_addr,
+ dma->rx_size, DMA_FROM_DEVICE);
kfree(dma->rx_buf);
dma_release_channel(dma->rx_chan);
dma->rx_chan = NULL;
@@ -1151,8 +1156,8 @@ static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)
if (dma->tx_chan) {
dmaengine_terminate_all(dma->tx_chan);
- dma_unmap_single(p->port.dev, dma->tx_addr,
- UART_XMIT_SIZE, DMA_TO_DEVICE);
+ dma_unmap_single(dma->tx_chan->device->dev, dma->tx_addr,
+ UART_XMIT_SIZE, DMA_TO_DEVICE);
dma_release_channel(dma->tx_chan);
dma->tx_chan = NULL;
}
@@ -1352,6 +1357,28 @@ static int apple_s5l_serial_startup(struct uart_port *port)
return ret;
}
+static void exynos_usi_init(struct uart_port *port)
+{
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+ struct s3c24xx_uart_info *info = ourport->info;
+ unsigned int val;
+
+ if (!info->has_usi)
+ return;
+
+ /* Clear the software reset of USI block (it's set at startup) */
+ val = rd_regl(port, USI_CON);
+ val &= ~USI_CON_RESET_MASK;
+ wr_regl(port, USI_CON, val);
+ udelay(1);
+
+ /* Continuously provide the clock to USI IP w/o gating (for Rx mode) */
+ val = rd_regl(port, USI_OPTION);
+ val &= ~USI_OPTION_HWACG_MASK;
+ val |= USI_OPTION_HWACG_CLKREQ_ON;
+ wr_regl(port, USI_OPTION, val);
+}
+
/* power power management control */
static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
@@ -1379,6 +1406,7 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
if (!IS_ERR(ourport->baudclk))
clk_prepare_enable(ourport->baudclk);
+ exynos_usi_init(port);
break;
default:
dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
@@ -2102,6 +2130,8 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
if (ret)
pr_warn("uart: failed to enable baudclk\n");
+ exynos_usi_init(port);
+
/* Keep all interrupts masked and cleared */
switch (ourport->info->type) {
case TYPE_S3C6400:
@@ -2750,10 +2780,11 @@ static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
#endif
#if defined(CONFIG_ARCH_EXYNOS)
-#define EXYNOS_COMMON_SERIAL_DRV_DATA \
+#define EXYNOS_COMMON_SERIAL_DRV_DATA_USI(_has_usi) \
.info = &(struct s3c24xx_uart_info) { \
.name = "Samsung Exynos UART", \
.type = TYPE_S3C6400, \
+ .has_usi = _has_usi, \
.port_type = PORT_S3C6400, \
.has_divslot = 1, \
.rx_fifomask = S5PV210_UFSTAT_RXMASK, \
@@ -2773,6 +2804,9 @@ static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
.has_fracval = 1, \
} \
+#define EXYNOS_COMMON_SERIAL_DRV_DATA \
+ EXYNOS_COMMON_SERIAL_DRV_DATA_USI(0)
+
static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
EXYNOS_COMMON_SERIAL_DRV_DATA,
.fifosize = { 256, 64, 16, 16 },
@@ -2783,11 +2817,19 @@ static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
.fifosize = { 64, 256, 16, 256 },
};
+static struct s3c24xx_serial_drv_data exynos850_serial_drv_data = {
+ EXYNOS_COMMON_SERIAL_DRV_DATA_USI(1),
+ .fifosize = { 256, 64, 64, 64 },
+};
+
#define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
#define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data)
+#define EXYNOS850_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos850_serial_drv_data)
+
#else
-#define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
-#define EXYNOS5433_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)NULL)
+#define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)NULL)
+#define EXYNOS850_SERIAL_DRV_DATA ((kernel_ulong_t)NULL)
#endif
#ifdef CONFIG_ARCH_APPLE
@@ -2843,6 +2885,9 @@ static const struct platform_device_id s3c24xx_serial_driver_ids[] = {
}, {
.name = "s5l-uart",
.driver_data = S5L_SERIAL_DRV_DATA,
+ }, {
+ .name = "exynos850-uart",
+ .driver_data = EXYNOS850_SERIAL_DRV_DATA,
},
{ },
};
@@ -2866,6 +2911,8 @@ static const struct of_device_id s3c24xx_uart_dt_match[] = {
.data = (void *)EXYNOS5433_SERIAL_DRV_DATA },
{ .compatible = "apple,s5l-uart",
.data = (void *)S5L_SERIAL_DRV_DATA },
+ { .compatible = "samsung,exynos850-uart",
+ .data = (void *)EXYNOS850_SERIAL_DRV_DATA },
{},
};
MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.