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Diffstat (limited to 'drivers/tty/serial/cpm_uart')
-rw-r--r--drivers/tty/serial/cpm_uart/cpm_uart_core.c81
-rw-r--r--drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c2
-rw-r--r--drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c1
3 files changed, 62 insertions, 22 deletions
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index b418947b710..aa60e6d13ec 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -41,6 +41,8 @@
#include <linux/bootmem.h>
#include <linux/dma-mapping.h>
#include <linux/fs_uart_pd.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
@@ -71,7 +73,7 @@ static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
/**************************************************************/
-#define HW_BUF_SPD_THRESHOLD 9600
+#define HW_BUF_SPD_THRESHOLD 2400
/*
* Check, if transmit buffers are processed
@@ -245,7 +247,7 @@ static void cpm_uart_int_rx(struct uart_port *port)
int i;
unsigned char ch;
u8 *cp;
- struct tty_struct *tty = port->state->port.tty;
+ struct tty_port *tport = &port->state->port;
struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
cbd_t __iomem *bdp;
u16 status;
@@ -276,7 +278,7 @@ static void cpm_uart_int_rx(struct uart_port *port)
/* If we have not enough room in tty flip buffer, then we try
* later, which will be the next rx-interrupt or a timeout
*/
- if(tty_buffer_request_room(tty, i) < i) {
+ if (tty_buffer_request_room(tport, i) < i) {
printk(KERN_WARNING "No room in flip buffer\n");
return;
}
@@ -302,7 +304,7 @@ static void cpm_uart_int_rx(struct uart_port *port)
}
#endif
error_return:
- tty_insert_flip_char(tty, ch, flg);
+ tty_insert_flip_char(tport, ch, flg);
} /* End while (i--) */
@@ -322,7 +324,7 @@ static void cpm_uart_int_rx(struct uart_port *port)
pinfo->rx_cur = bdp;
/* activate BH processing */
- tty_flip_buffer_push(tty);
+ tty_flip_buffer_push(tport);
return;
@@ -417,6 +419,7 @@ static int cpm_uart_startup(struct uart_port *port)
clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR);
clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX);
}
+ cpm_uart_initbd(pinfo);
cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
}
/* Install interrupt handler. */
@@ -500,16 +503,28 @@ static void cpm_uart_set_termios(struct uart_port *port,
struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
smc_t __iomem *smcp = pinfo->smcp;
scc_t __iomem *sccp = pinfo->sccp;
+ int maxidl;
pr_debug("CPM uart[%d]:set_termios\n", port->line);
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
- if (baud <= HW_BUF_SPD_THRESHOLD ||
- (pinfo->port.state && pinfo->port.state->port.tty->low_latency))
+ if (baud < HW_BUF_SPD_THRESHOLD ||
+ (pinfo->port.state && pinfo->port.state->port.low_latency))
pinfo->rx_fifosize = 1;
else
pinfo->rx_fifosize = RX_BUF_SIZE;
+ /* MAXIDL is the timeout after which a receive buffer is closed
+ * when not full if no more characters are received.
+ * We calculate it from the baudrate so that the duration is
+ * always the same at standard rates: about 4ms.
+ */
+ maxidl = baud / 2400;
+ if (maxidl < 1)
+ maxidl = 1;
+ if (maxidl > 0x10)
+ maxidl = 0x10;
+
/* Character length programmed into the mode register is the
* sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
* 1 or 2 stop bits, minus 1.
@@ -610,6 +625,7 @@ static void cpm_uart_set_termios(struct uart_port *port,
* SMC/SCC receiver is disabled.
*/
out_be16(&pinfo->smcup->smc_mrblr, pinfo->rx_fifosize);
+ out_be16(&pinfo->smcup->smc_maxidl, maxidl);
/* Set the mode register. We want to keep a copy of the
* enables, because we want to put them back if they were
@@ -622,6 +638,7 @@ static void cpm_uart_set_termios(struct uart_port *port,
SMCMR_SM_UART | prev_mode);
} else {
out_be16(&pinfo->sccup->scc_genscc.scc_mrblr, pinfo->rx_fifosize);
+ out_be16(&pinfo->sccup->scc_maxidl, maxidl);
out_be16(&sccp->scc_psmr, (sbits << 12) | scval);
}
@@ -798,7 +815,7 @@ static void cpm_uart_init_scc(struct uart_cpm_port *pinfo)
cpm_set_scc_fcr(sup);
out_be16(&sup->scc_genscc.scc_mrblr, pinfo->rx_fifosize);
- out_be16(&sup->scc_maxidl, pinfo->rx_fifosize);
+ out_be16(&sup->scc_maxidl, 0x10);
out_be16(&sup->scc_brkcr, 1);
out_be16(&sup->scc_parec, 0);
out_be16(&sup->scc_frmec, 0);
@@ -872,7 +889,7 @@ static void cpm_uart_init_smc(struct uart_cpm_port *pinfo)
/* Using idle character time requires some additional tuning. */
out_be16(&up->smc_mrblr, pinfo->rx_fifosize);
- out_be16(&up->smc_maxidl, pinfo->rx_fifosize);
+ out_be16(&up->smc_maxidl, 0x10);
out_be16(&up->smc_brklen, 0);
out_be16(&up->smc_brkec, 0);
out_be16(&up->smc_brkcr, 1);
@@ -954,7 +971,7 @@ static void cpm_uart_config_port(struct uart_port *port, int flags)
* Note that this is called with interrupts already disabled
*/
static void cpm_uart_early_write(struct uart_cpm_port *pinfo,
- const char *string, u_int count)
+ const char *string, u_int count, bool handle_linefeed)
{
unsigned int i;
cbd_t __iomem *bdp, *bdbase;
@@ -996,7 +1013,7 @@ static void cpm_uart_early_write(struct uart_cpm_port *pinfo,
bdp++;
/* if a LF, also do CR... */
- if (*string == 10) {
+ if (handle_linefeed && *string == 10) {
while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
;
@@ -1094,7 +1111,7 @@ static void cpm_put_poll_char(struct uart_port *port,
static char ch[2];
ch[0] = (char)c;
- cpm_uart_early_write(pinfo, ch, 1);
+ cpm_uart_early_write(pinfo, ch, 1, false);
}
#endif /* CONFIG_CONSOLE_POLL */
@@ -1192,14 +1209,38 @@ static int cpm_uart_init_port(struct device_node *np,
pinfo->port.fifosize = pinfo->tx_nrfifos * pinfo->tx_fifosize;
spin_lock_init(&pinfo->port.lock);
- pinfo->port.irq = of_irq_to_resource(np, 0, NULL);
+ pinfo->port.irq = irq_of_parse_and_map(np, 0);
if (pinfo->port.irq == NO_IRQ) {
ret = -EINVAL;
goto out_pram;
}
- for (i = 0; i < NUM_GPIOS; i++)
- pinfo->gpios[i] = of_get_gpio(np, i);
+ for (i = 0; i < NUM_GPIOS; i++) {
+ int gpio;
+
+ pinfo->gpios[i] = -1;
+
+ gpio = of_get_gpio(np, i);
+
+ if (gpio_is_valid(gpio)) {
+ ret = gpio_request(gpio, "cpm_uart");
+ if (ret) {
+ pr_err("can't request gpio #%d: %d\n", i, ret);
+ continue;
+ }
+ if (i == GPIO_RTS || i == GPIO_DTR)
+ ret = gpio_direction_output(gpio, 0);
+ else
+ ret = gpio_direction_input(gpio);
+ if (ret) {
+ pr_err("can't set direction for gpio #%d: %d\n",
+ i, ret);
+ gpio_free(gpio);
+ continue;
+ }
+ pinfo->gpios[i] = gpio;
+ }
+ }
#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
udbg_putc = NULL;
@@ -1234,7 +1275,7 @@ static void cpm_uart_console_write(struct console *co, const char *s,
spin_lock_irqsave(&pinfo->port.lock, flags);
}
- cpm_uart_early_write(pinfo, s, count);
+ cpm_uart_early_write(pinfo, s, count, true);
if (unlikely(nolock)) {
local_irq_restore(flags);
@@ -1358,7 +1399,7 @@ static struct uart_driver cpm_reg = {
static int probe_index;
-static int __devinit cpm_uart_probe(struct platform_device *ofdev)
+static int cpm_uart_probe(struct platform_device *ofdev)
{
int index = probe_index++;
struct uart_cpm_port *pinfo = &cpm_uart_ports[index];
@@ -1369,7 +1410,7 @@ static int __devinit cpm_uart_probe(struct platform_device *ofdev)
if (index >= UART_NR)
return -ENODEV;
- dev_set_drvdata(&ofdev->dev, pinfo);
+ platform_set_drvdata(ofdev, pinfo);
/* initialize the device pointer for the port */
pinfo->port.dev = &ofdev->dev;
@@ -1381,9 +1422,9 @@ static int __devinit cpm_uart_probe(struct platform_device *ofdev)
return uart_add_one_port(&cpm_reg, &pinfo->port);
}
-static int __devexit cpm_uart_remove(struct platform_device *ofdev)
+static int cpm_uart_remove(struct platform_device *ofdev)
{
- struct uart_cpm_port *pinfo = dev_get_drvdata(&ofdev->dev);
+ struct uart_cpm_port *pinfo = platform_get_drvdata(ofdev);
return uart_remove_one_port(&cpm_reg, &pinfo->port);
}
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c b/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c
index 18f79575894..6d3b22e9324 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c
@@ -29,7 +29,6 @@
#include <linux/tty.h>
#include <linux/gfp.h>
#include <linux/ioport.h>
-#include <linux/init.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/sysrq.h>
@@ -45,6 +44,7 @@
#include <linux/kernel.h>
#include <linux/of.h>
+#include <linux/of_address.h>
#include "cpm_uart.h"
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c
index a4927e66e74..f46d2ca8720 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c
@@ -29,7 +29,6 @@
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/slab.h>
-#include <linux/init.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/sysrq.h>
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 15:09:05 +0000