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path: root/drivers/tty/serial/pch_uart.c
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Diffstat (limited to 'drivers/tty/serial/pch_uart.c')
-rw-r--r--drivers/tty/serial/pch_uart.c125
1 files changed, 79 insertions, 46 deletions
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 21a7e179edf..0cb6a8e52bd 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -217,6 +217,7 @@ enum {
#define FRI2_64_UARTCLK 64000000 /* 64.0000 MHz */
#define FRI2_48_UARTCLK 48000000 /* 48.0000 MHz */
#define NTC1_UARTCLK 64000000 /* 64.0000 MHz */
+#define MINNOW_UARTCLK 50000000 /* 50.0000 MHz */
struct pch_uart_buffer {
unsigned char *buf;
@@ -231,7 +232,7 @@ struct eg20t_port {
unsigned int iobase;
struct pci_dev *pdev;
int fifo_size;
- int uartclk;
+ unsigned int uartclk;
int start_tx;
int start_rx;
int tx_empty;
@@ -256,6 +257,8 @@ struct eg20t_port {
dma_addr_t rx_buf_dma;
struct dentry *debugfs;
+#define IRQ_NAME_SIZE 17
+ char irq_name[IRQ_NAME_SIZE];
/* protect the eg20t_port private structure and io access to membase */
spinlock_t lock;
@@ -372,31 +375,62 @@ static const struct file_operations port_regs_ops = {
};
#endif /* CONFIG_DEBUG_FS */
+static struct dmi_system_id pch_uart_dmi_table[] = {
+ {
+ .ident = "CM-iTC",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "CM-iTC"),
+ },
+ (void *)CMITC_UARTCLK,
+ },
+ {
+ .ident = "FRI2",
+ {
+ DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
+ },
+ (void *)FRI2_64_UARTCLK,
+ },
+ {
+ .ident = "Fish River Island II",
+ {
+ DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
+ },
+ (void *)FRI2_48_UARTCLK,
+ },
+ {
+ .ident = "COMe-mTT",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
+ },
+ (void *)NTC1_UARTCLK,
+ },
+ {
+ .ident = "nanoETXexpress-TT",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
+ },
+ (void *)NTC1_UARTCLK,
+ },
+ {
+ .ident = "MinnowBoard",
+ {
+ DMI_MATCH(DMI_BOARD_NAME, "MinnowBoard"),
+ },
+ (void *)MINNOW_UARTCLK,
+ },
+};
+
/* Return UART clock, checking for board specific clocks. */
-static int pch_uart_get_uartclk(void)
+static unsigned int pch_uart_get_uartclk(void)
{
- const char *cmp;
+ const struct dmi_system_id *d;
if (user_uartclk)
return user_uartclk;
- cmp = dmi_get_system_info(DMI_BOARD_NAME);
- if (cmp && strstr(cmp, "CM-iTC"))
- return CMITC_UARTCLK;
-
- cmp = dmi_get_system_info(DMI_BIOS_VERSION);
- if (cmp && strnstr(cmp, "FRI2", 4))
- return FRI2_64_UARTCLK;
-
- cmp = dmi_get_system_info(DMI_PRODUCT_NAME);
- if (cmp && strstr(cmp, "Fish River Island II"))
- return FRI2_48_UARTCLK;
-
- /* Kontron COMe-mTT10 (nanoETXexpress-TT) */
- cmp = dmi_get_system_info(DMI_BOARD_NAME);
- if (cmp && (strstr(cmp, "COMe-mTT") ||
- strstr(cmp, "nanoETXexpress-TT")))
- return NTC1_UARTCLK;
+ d = dmi_first_match(pch_uart_dmi_table);
+ if (d)
+ return (unsigned long)d->driver_data;
return DEFAULT_UARTCLK;
}
@@ -417,7 +451,7 @@ static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
iowrite8(ier, priv->membase + UART_IER);
}
-static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
+static int pch_uart_hal_set_line(struct eg20t_port *priv, unsigned int baud,
unsigned int parity, unsigned int bits,
unsigned int stb)
{
@@ -452,7 +486,7 @@ static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
lcr |= bits;
lcr |= stb;
- dev_dbg(priv->port.dev, "%s:baud = %d, div = %04x, lcr = %02x (%lu)\n",
+ dev_dbg(priv->port.dev, "%s:baud = %u, div = %04x, lcr = %02x (%lu)\n",
__func__, baud, div, lcr, jiffies);
iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
iowrite8(dll, priv->membase + PCH_UART_DLL);
@@ -635,30 +669,21 @@ static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
static int dma_push_rx(struct eg20t_port *priv, int size)
{
- struct tty_struct *tty;
int room;
struct uart_port *port = &priv->port;
struct tty_port *tport = &port->state->port;
- port = &priv->port;
- tty = tty_port_tty_get(tport);
- if (!tty) {
- dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
- return 0;
- }
-
room = tty_buffer_request_room(tport, size);
if (room < size)
dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
size - room);
if (!room)
- return room;
+ return 0;
tty_insert_flip_string(tport, sg_virt(&priv->sg_rx), size);
port->icount.rx += room;
- tty_kref_put(tty);
return room;
}
@@ -1066,6 +1091,8 @@ static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
if (tty == NULL) {
for (i = 0; error_msg[i] != NULL; i++)
dev_err(&priv->pdev->dev, error_msg[i]);
+ } else {
+ tty_kref_put(tty);
}
}
@@ -1318,7 +1345,7 @@ static int pch_uart_startup(struct uart_port *port)
return ret;
ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
- KBUILD_MODNAME, priv);
+ priv->irq_name, priv);
if (ret < 0)
return ret;
@@ -1358,9 +1385,8 @@ static void pch_uart_shutdown(struct uart_port *port)
static void pch_uart_set_termios(struct uart_port *port,
struct ktermios *termios, struct ktermios *old)
{
- int baud;
int rtn;
- unsigned int parity, bits, stb;
+ unsigned int baud, parity, bits, stb;
struct eg20t_port *priv;
unsigned long flags;
@@ -1484,15 +1510,20 @@ static int pch_uart_verify_port(struct uart_port *port,
__func__);
return -EOPNOTSUPP;
#endif
- dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n");
- if (!priv->use_dma)
+ if (!priv->use_dma) {
pch_request_dma(port);
- priv->use_dma = 1;
+ if (priv->chan_rx)
+ priv->use_dma = 1;
+ }
+ dev_info(priv->port.dev, "PCH UART: %s\n",
+ priv->use_dma ?
+ "Use DMA Mode" : "No DMA");
}
return 0;
}
+#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_PCH_UART_CONSOLE)
/*
* Wait for transmitter & holding register to empty
*/
@@ -1523,6 +1554,7 @@ static void wait_for_xmitr(struct eg20t_port *up, int bits)
}
}
}
+#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_PCH_UART_CONSOLE */
#ifdef CONFIG_CONSOLE_POLL
/*
@@ -1558,13 +1590,8 @@ static void pch_uart_put_poll_char(struct uart_port *port,
wait_for_xmitr(priv, UART_LSR_THRE);
/*
* Send the character out.
- * If a LF, also do CR...
*/
iowrite8(c, priv->membase + PCH_UART_THR);
- if (c == 10) {
- wait_for_xmitr(priv, UART_LSR_THRE);
- iowrite8(13, priv->membase + PCH_UART_THR);
- }
/*
* Finally, wait for transmitter to become empty
@@ -1588,7 +1615,6 @@ static struct uart_ops pch_uart_ops = {
.shutdown = pch_uart_shutdown,
.set_termios = pch_uart_set_termios,
/* .pm = pch_uart_pm, Not supported yet */
-/* .set_wake = pch_uart_set_wake, Not supported yet */
.type = pch_uart_type,
.release_port = pch_uart_release_port,
.request_port = pch_uart_request_port,
@@ -1733,7 +1759,9 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
int fifosize;
int port_type;
struct pch_uart_driver_data *board;
+#ifdef CONFIG_DEBUG_FS
char name[32]; /* for debugfs file name */
+#endif
board = &drv_dat[id->driver_data];
port_type = board->port_type;
@@ -1787,6 +1815,10 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
priv->port.line = board->line_no;
priv->trigger = PCH_UART_HAL_TRIGGER_M;
+ snprintf(priv->irq_name, IRQ_NAME_SIZE,
+ KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d",
+ priv->port.line);
+
spin_lock_init(&priv->port.lock);
pci_set_drvdata(pdev, priv);
@@ -1828,7 +1860,6 @@ static void pch_uart_exit_port(struct eg20t_port *priv)
debugfs_remove(priv->debugfs);
#endif
uart_remove_one_port(&pch_uart_driver, &priv->port);
- pci_set_drvdata(priv->pdev, NULL);
free_page((unsigned long)priv->rxbuf.buf);
}
@@ -1882,7 +1913,7 @@ static int pch_uart_pci_resume(struct pci_dev *pdev)
#define pch_uart_pci_resume NULL
#endif
-static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
+static const struct pci_device_id pch_uart_pci_id[] = {
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
.driver_data = pch_et20t_uart0},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
@@ -1970,6 +2001,8 @@ module_exit(pch_uart_module_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
+MODULE_DEVICE_TABLE(pci, pch_uart_pci_id);
+
module_param(default_baud, uint, S_IRUGO);
MODULE_PARM_DESC(default_baud,
"Default BAUD for initial driver state and console (default 9600)");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 10:29:08 +0000