[PATCH] 2.6 Altix : rs422 support for ioc4 serial driver

From: Pat Gefre
Date: Fri Mar 17 2006 - 14:35:58 EST



This patch adds rs422 support to the Altix ioc4 serial driver.


ioc4_serial.c | 335 ++++++++++++++++++++++++++++++++++++----------------------
1 files changed, 211 insertions(+), 124 deletions(-)


Signed-off-by: Patrick Gefre <pfg@xxxxxxx>


Index: linux-2.6/drivers/serial/ioc4_serial.c
===================================================================
--- linux-2.6.orig/drivers/serial/ioc4_serial.c 2006-03-09 11:38:36.697103905 -0600
+++ linux-2.6/drivers/serial/ioc4_serial.c 2006-03-17 08:47:48.621553907 -0600
@@ -3,7 +3,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
- * Copyright (C) 2003-2005 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (C) 2003-2006 Silicon Graphics, Inc. All Rights Reserved.
*/


@@ -323,9 +323,12 @@
#define IOC4_FIFO_CHARS 255

/* Device name we're using */
-#define DEVICE_NAME "ttyIOC"
-#define DEVICE_MAJOR 204
-#define DEVICE_MINOR 50
+#define DEVICE_NAME_RS232 "ttyIOC"
+#define DEVICE_NAME_RS422 "ttyAIOC"
+#define DEVICE_MAJOR 204
+#define DEVICE_MINOR_RS232 50
+#define DEVICE_MINOR_RS422 84
+

/* register offsets */
#define IOC4_SERIAL_OFFSET 0x300
@@ -341,10 +344,8 @@
#define MAX_BAUD_SUPPORTED 115200

/* protocol types supported */
-enum sio_proto {
- PROTO_RS232,
- PROTO_RS422
-};
+#define PROTO_RS232 3
+#define PROTO_RS422 7

/* Notification types */
#define N_DATA_READY 0x01
@@ -395,11 +396,17 @@
/*
* This is the entry saved by the driver - one per card
*/
+
+#define UART_PORT_MIN 0
+#define UART_PORT_RS232 UART_PORT_MIN
+#define UART_PORT_RS422 1
+#define UART_PORT_COUNT 2 /* one for each mode */
+
struct ioc4_control {
int ic_irq;
struct {
- /* uart ports are allocated here */
- struct uart_port icp_uart_port;
+ /* uart ports are allocated here - 1 for rs232, 1 for rs422 */
+ struct uart_port icp_uart_port[UART_PORT_COUNT];
/* Handy reference material */
struct ioc4_port *icp_port;
} ic_port[IOC4_NUM_SERIAL_PORTS];
@@ -443,7 +450,9 @@

/* Local port info for each IOC4 serial ports */
struct ioc4_port {
- struct uart_port *ip_port;
+ struct uart_port *ip_port; /* current active port ptr */
+ /* Ptrs for all ports */
+ struct uart_port *ip_all_ports[UART_PORT_COUNT];
/* Back ptrs for this port */
struct ioc4_control *ip_control;
struct pci_dev *ip_pdev;
@@ -502,6 +511,12 @@
#define DCD_ON 0x02
#define LOWAT_WRITTEN 0x04
#define READ_ABORTED 0x08
+#define PORT_ACTIVE 0x10
+#define PORT_INACTIVE 0 /* This is the value when "off" */
+
+#define PORT_IS_ACTIVE(_x, _y) ((_x->ip_flags & PORT_ACTIVE) \
+ && (_x->ip_port == _y))
+

/* Since each port has different register offsets and bitmasks
* for everything, we'll store those that we need in tables so we
@@ -708,19 +723,30 @@
/**
* get_ioc4_port - given a uart port, return the control structure
* @port: uart port
+ * @set: set this port as current
*/
-static struct ioc4_port *get_ioc4_port(struct uart_port *the_port)
+static struct ioc4_port *get_ioc4_port(struct uart_port *the_port, int set)
{
struct ioc4_driver_data *idd = dev_get_drvdata(the_port->dev);
struct ioc4_control *control = idd->idd_serial_data;
- int ii;
+ struct ioc4_port *port;
+ int ii, jj;

if (control) {
for ( ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++ ) {
- if (!control->ic_port[ii].icp_port)
+ port = control->ic_port[ii].icp_port;
+ if (!port)
continue;
- if (the_port == control->ic_port[ii].icp_port->ip_port)
- return control->ic_port[ii].icp_port;
+ for (jj = UART_PORT_MIN; jj < UART_PORT_COUNT; jj++) {
+ if (the_port == port->ip_all_ports[jj]) {
+ /* set local copy */
+ if (set) {
+ port->ip_port
+ = port->ip_all_ports[jj];
+ }
+ return port;
+ }
+ }
}
}
return NULL;
@@ -946,6 +972,7 @@
* @arg: handler arg
* @regs: registers
*/
+
static irqreturn_t ioc4_intr(int irq, void *arg, struct pt_regs *regs)
{
struct ioc4_soft *soft;
@@ -980,7 +1007,6 @@
#ifdef DEBUG_INTERRUPTS
{
struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr;
- spinlock_t *lp = &soft->is_ir_lock;
unsigned long flag;

spin_lock_irqsave(&soft->is_ir_lock, flag);
@@ -1177,7 +1203,7 @@
{
int spiniter = 0;

- port->ip_flags = 0;
+ port->ip_flags = PORT_ACTIVE;

/* Pause the DMA interface if necessary */
if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
@@ -1187,6 +1213,7 @@
& IOC4_SSCR_PAUSE_STATE) == 0) {
spiniter++;
if (spiniter > MAXITER) {
+ port->ip_flags = PORT_INACTIVE;
return -1;
}
}
@@ -1506,14 +1533,13 @@
/**
* set_mcr - set the master control reg
* @the_port: port to use
- * @set: set ?
* @mask1: mcr mask
* @mask2: shadow mask
*/
-static inline int set_mcr(struct uart_port *the_port, int set,
+static inline int set_mcr(struct uart_port *the_port,
int mask1, int mask2)
{
- struct ioc4_port *port = get_ioc4_port(the_port);
+ struct ioc4_port *port = get_ioc4_port(the_port, 0);
uint32_t shadow;
int spiniter = 0;
char mcr;
@@ -1536,13 +1562,9 @@
mcr = (shadow & 0xff000000) >> 24;

/* Set new value */
- if (set) {
- mcr |= mask1;
- shadow |= mask2;
- } else {
- mcr &= ~mask1;
- shadow &= ~mask2;
- }
+ mcr |= mask1;
+ shadow |= mask2;
+
writeb(mcr, &port->ip_uart_regs->i4u_mcr);
writel(shadow, &port->ip_serial_regs->shadow);

@@ -1558,7 +1580,7 @@
* @port: port to use
* @proto: protocol to use
*/
-static int ioc4_set_proto(struct ioc4_port *port, enum sio_proto proto)
+static int ioc4_set_proto(struct ioc4_port *port, int proto)
{
struct hooks *hooks = port->ip_hooks;

@@ -1589,7 +1611,7 @@
int result;
char *start;
struct tty_struct *tty;
- struct ioc4_port *port = get_ioc4_port(the_port);
+ struct ioc4_port *port = get_ioc4_port(the_port, 0);
struct uart_info *info;

if (!the_port)
@@ -1645,7 +1667,7 @@
ioc4_change_speed(struct uart_port *the_port,
struct termios *new_termios, struct termios *old_termios)
{
- struct ioc4_port *port = get_ioc4_port(the_port);
+ struct ioc4_port *port = get_ioc4_port(the_port, 0);
int baud, bits;
unsigned cflag;
int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
@@ -1752,7 +1774,7 @@
if (!the_port)
return -1;

- port = get_ioc4_port(the_port);
+ port = get_ioc4_port(the_port, 0);
if (!port)
return -1;

@@ -1760,6 +1782,9 @@

local_open(port);

+ /* set the protocol - mapbase has the port type */
+ ioc4_set_proto(port, the_port->mapbase);
+
/* set the speed of the serial port */
ioc4_change_speed(the_port, info->tty->termios, (struct termios *)0);

@@ -1768,17 +1793,17 @@

/*
* ioc4_cb_output_lowat - called when the output low water mark is hit
- * @port: port to output
+ * @the_port: port to output
*/
-static void ioc4_cb_output_lowat(struct ioc4_port *port)
+static void ioc4_cb_output_lowat(struct uart_port *the_port)
{
unsigned long pflags;

/* ip_lock is set on the call here */
- if (port->ip_port) {
- spin_lock_irqsave(&port->ip_port->lock, pflags);
- transmit_chars(port->ip_port);
- spin_unlock_irqrestore(&port->ip_port->lock, pflags);
+ if (the_port) {
+ spin_lock_irqsave(&the_port->lock, pflags);
+ transmit_chars(the_port);
+ spin_unlock_irqrestore(&the_port->lock, pflags);
}
}

@@ -1923,7 +1948,7 @@
&port->ip_mem->sio_ir.raw);

if (port->ip_notify & N_OUTPUT_LOWAT)
- ioc4_cb_output_lowat(port);
+ ioc4_cb_output_lowat(port->ip_port);
}

/* Handle tx_mt. Must come after tx_explicit. */
@@ -1936,7 +1961,7 @@
* So send the notification now.
*/
if (port->ip_notify & N_OUTPUT_LOWAT) {
- ioc4_cb_output_lowat(port);
+ ioc4_cb_output_lowat(port->ip_port);

/* We need to reload the sio_ir since the lowat
* call may have caused another write to occur,
@@ -2023,7 +2048,7 @@
int len)
{
int prod_ptr, cons_ptr, total;
- struct ioc4_port *port = get_ioc4_port(the_port);
+ struct ioc4_port *port = get_ioc4_port(the_port, 0);
struct ring *inring;
struct ring_entry *entry;
struct hooks *hooks = port->ip_hooks;
@@ -2335,17 +2360,27 @@
*/
static const char *ic4_type(struct uart_port *the_port)
{
- return "SGI IOC4 Serial";
+ if (the_port->mapbase == PROTO_RS232)
+ return "SGI IOC4 Serial [rs232]";
+ else
+ return "SGI IOC4 Serial [rs422]";
}

/**
- * ic4_tx_empty - Is the transmitter empty? We pretend we're always empty
- * @port: Port to operate on (we ignore since we always return 1)
+ * ic4_tx_empty - Is the transmitter empty?
+ * @port: Port to operate on
*
*/
static unsigned int ic4_tx_empty(struct uart_port *the_port)
{
- return 1;
+ struct ioc4_port *port = get_ioc4_port(the_port, 0);
+ unsigned int ret = 0;
+
+ if (port && PORT_IS_ACTIVE(port, the_port)) {
+ if (readl(&port->ip_serial_regs->shadow) & IOC4_SHADOW_TEMT)
+ ret = TIOCSER_TEMT;
+ }
+ return ret;
}

/**
@@ -2355,6 +2390,10 @@
*/
static void ic4_stop_tx(struct uart_port *the_port)
{
+ struct ioc4_port *port = get_ioc4_port(the_port, 0);
+
+ if (port && PORT_IS_ACTIVE(port, the_port))
+ set_notification(port, N_OUTPUT_LOWAT, 0);
}

/**
@@ -2377,11 +2416,12 @@
struct ioc4_port *port;
struct uart_info *info;

- port = get_ioc4_port(the_port);
+ port = get_ioc4_port(the_port, 0);
if (!port)
return;

info = the_port->info;
+ port->ip_port = NULL;

wake_up_interruptible(&info->delta_msr_wait);

@@ -2390,6 +2430,7 @@

spin_lock_irqsave(&the_port->lock, port_flags);
set_notification(port, N_ALL, 0);
+ port->ip_flags = PORT_INACTIVE;
spin_unlock_irqrestore(&the_port->lock, port_flags);
}

@@ -2402,6 +2443,11 @@
static void ic4_set_mctrl(struct uart_port *the_port, unsigned int mctrl)
{
unsigned char mcr = 0;
+ struct ioc4_port *port;
+
+ port = get_ioc4_port(the_port, 0);
+ if (!port || !PORT_IS_ACTIVE(port, the_port))
+ return;

if (mctrl & TIOCM_RTS)
mcr |= UART_MCR_RTS;
@@ -2414,7 +2460,7 @@
if (mctrl & TIOCM_LOOP)
mcr |= UART_MCR_LOOP;

- set_mcr(the_port, 1, mcr, IOC4_SHADOW_DTR);
+ set_mcr(the_port, mcr, IOC4_SHADOW_DTR);
}

/**
@@ -2424,11 +2470,11 @@
*/
static unsigned int ic4_get_mctrl(struct uart_port *the_port)
{
- struct ioc4_port *port = get_ioc4_port(the_port);
+ struct ioc4_port *port = get_ioc4_port(the_port, 0);
uint32_t shadow;
unsigned int ret = 0;

- if (!port)
+ if (!port || !PORT_IS_ACTIVE(port, the_port))
return 0;

shadow = readl(&port->ip_serial_regs->shadow);
@@ -2448,9 +2494,9 @@
*/
static void ic4_start_tx(struct uart_port *the_port)
{
- struct ioc4_port *port = get_ioc4_port(the_port);
+ struct ioc4_port *port = get_ioc4_port(the_port, 0);

- if (port) {
+ if (port && PORT_IS_ACTIVE(port, the_port)) {
set_notification(port, N_OUTPUT_LOWAT, 1);
enable_intrs(port, port->ip_hooks->intr_tx_mt);
}
@@ -2467,7 +2513,7 @@
}

/**
- * ic4_startup - Start up the serial port - always return 0 (We're always on)
+ * ic4_startup - Start up the serial port
* @port: Port to operate on
*
*/
@@ -2479,17 +2525,16 @@
struct uart_info *info;
unsigned long port_flags;

- if (!the_port) {
+ if (!the_port)
return -ENODEV;
- }
- port = get_ioc4_port(the_port);
- if (!port) {
+ port = get_ioc4_port(the_port, 1);
+ if (!port)
return -ENODEV;
- }
info = the_port->info;

control = port->ip_control;
if (!control) {
+ port->ip_port = NULL;
return -ENODEV;
}

@@ -2551,28 +2596,100 @@
* Boot-time initialization code
*/

-static struct uart_driver ioc4_uart = {
+static struct uart_driver ioc4_uart_rs232 = {
+ .owner = THIS_MODULE,
+ .driver_name = "ioc4_serial_rs232",
+ .dev_name = DEVICE_NAME_RS232,
+ .major = DEVICE_MAJOR,
+ .minor = DEVICE_MINOR_RS232,
+ .nr = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS,
+};
+
+static struct uart_driver ioc4_uart_rs422 = {
.owner = THIS_MODULE,
- .driver_name = "ioc4_serial",
- .dev_name = DEVICE_NAME,
+ .driver_name = "ioc4_serial_rs422",
+ .dev_name = DEVICE_NAME_RS422,
.major = DEVICE_MAJOR,
- .minor = DEVICE_MINOR,
+ .minor = DEVICE_MINOR_RS422,
.nr = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS,
};

+
/**
- * ioc4_serial_core_attach - register with serial core
+ * ioc4_serial_remove_one - detach function
+ *
+ * @idd: IOC4 master module data for this IOC4
+ */
+
+int ioc4_serial_remove_one(struct ioc4_driver_data *idd)
+{
+ int ii, jj;
+ struct ioc4_control *control;
+ struct uart_port *the_port;
+ struct ioc4_port *port;
+ struct ioc4_soft *soft;
+
+ control = idd->idd_serial_data;
+
+ for (ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++) {
+ for (jj = UART_PORT_MIN; jj < UART_PORT_COUNT; jj++) {
+ the_port = &control->ic_port[ii].icp_uart_port[jj];
+ if (the_port) {
+ switch (jj) {
+ case UART_PORT_RS422:
+ uart_remove_one_port(&ioc4_uart_rs422,
+ the_port);
+ break;
+ default:
+ case UART_PORT_RS232:
+ uart_remove_one_port(&ioc4_uart_rs232,
+ the_port);
+ break;
+ }
+ }
+ }
+ port = control->ic_port[ii].icp_port;
+ if (!(ii & 1) && port) {
+ pci_free_consistent(port->ip_pdev,
+ TOTAL_RING_BUF_SIZE,
+ (void *)port->ip_cpu_ringbuf,
+ port->ip_dma_ringbuf);
+ kfree(port);
+ }
+ }
+ soft = control->ic_soft;
+ if (soft) {
+ free_irq(control->ic_irq, (void *)soft);
+ if (soft->is_ioc4_serial_addr) {
+ release_region((unsigned long)
+ soft->is_ioc4_serial_addr,
+ sizeof(struct ioc4_serial));
+ }
+ kfree(soft);
+ }
+ kfree(control);
+ idd->idd_serial_data = NULL;
+
+ return 0;
+}
+
+
+/**
+ * ioc4_serial_core_attach_rs232 - register with serial core
* This is done during pci probing
* @pdev: handle for this card
*/
static inline int
-ioc4_serial_core_attach(struct pci_dev *pdev)
+ioc4_serial_core_attach(struct pci_dev *pdev, int port_type)
{
struct ioc4_port *port;
struct uart_port *the_port;
struct ioc4_driver_data *idd = pci_get_drvdata(pdev);
struct ioc4_control *control = idd->idd_serial_data;
int ii;
+ int port_index;
+ struct uart_driver *u_driver;
+

DPRINT_CONFIG(("%s: attach pdev 0x%p - control 0x%p\n",
__FUNCTION__, pdev, (void *)control));
@@ -2580,28 +2697,35 @@
if (!control)
return -ENODEV;

+ port_index = (port_type == PROTO_RS232) ? UART_PORT_RS232
+ : UART_PORT_RS422;
+
+ u_driver = (port_type == PROTO_RS232) ? &ioc4_uart_rs232
+ : &ioc4_uart_rs422;
+
/* once around for each port on this card */
for (ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++) {
- the_port = &control->ic_port[ii].icp_uart_port;
+ the_port = &control->ic_port[ii].icp_uart_port[port_index];
port = control->ic_port[ii].icp_port;
- port->ip_port = the_port;
+ port->ip_all_ports[port_index] = the_port;

- DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p\n",
+ DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p : type %s\n",
__FUNCTION__, (void *)the_port,
- (void *)port));
+ (void *)port,
+ port_type == PROTO_RS232 ? "rs232" : "rs422"));

/* membase, iobase and mapbase just need to be non-0 */
the_port->membase = (unsigned char __iomem *)1;
the_port->iobase = (pdev->bus->number << 16) | ii;
the_port->line = (Num_of_ioc4_cards << 2) | ii;
- the_port->mapbase = 1;
+ the_port->mapbase = port_type;
the_port->type = PORT_16550A;
the_port->fifosize = IOC4_FIFO_CHARS;
the_port->ops = &ioc4_ops;
the_port->irq = control->ic_irq;
the_port->dev = &pdev->dev;
spin_lock_init(&the_port->lock);
- if (uart_add_one_port(&ioc4_uart, the_port) < 0) {
+ if (uart_add_one_port(u_driver, the_port) < 0) {
printk(KERN_WARNING
"%s: unable to add port %d bus %d\n",
__FUNCTION__, the_port->line, pdev->bus->number);
@@ -2610,8 +2734,6 @@
("IOC4 serial port %d irq = %d, bus %d\n",
the_port->line, the_port->irq, pdev->bus->number));
}
- /* all ports are rs232 for now */
- ioc4_set_proto(port, PROTO_RS232);
}
return 0;
}
@@ -2656,8 +2778,7 @@
__FUNCTION__, (void *)idd->idd_misc_regs, (void *)serial));

/* Get memory for the new card */
- control = kmalloc(sizeof(struct ioc4_control) * IOC4_NUM_SERIAL_PORTS,
- GFP_KERNEL);
+ control = kmalloc(sizeof(struct ioc4_control), GFP_KERNEL);

if (!control) {
printk(KERN_WARNING "ioc4_attach_one"
@@ -2713,16 +2834,21 @@
if (ret)
goto out4;

- /* register port with the serial core */
+ /* register port with the serial core - 1 rs232, 1 rs422 */

- if ((ret = ioc4_serial_core_attach(idd->idd_pdev)))
+ if ((ret = ioc4_serial_core_attach(idd->idd_pdev, PROTO_RS232)))
goto out4;

+ if ((ret = ioc4_serial_core_attach(idd->idd_pdev, PROTO_RS422)))
+ goto out5;
+
Num_of_ioc4_cards++;

return ret;

/* error exits that give back resources */
+out5:
+ ioc4_serial_remove_one(idd);
out4:
kfree(soft);
out3:
@@ -2735,52 +2861,6 @@
}


-/**
- * ioc4_serial_remove_one - detach function
- *
- * @idd: IOC4 master module data for this IOC4
- */
-
-int ioc4_serial_remove_one(struct ioc4_driver_data *idd)
-{
- int ii;
- struct ioc4_control *control;
- struct uart_port *the_port;
- struct ioc4_port *port;
- struct ioc4_soft *soft;
-
- control = idd->idd_serial_data;
-
- for (ii = 0; ii < IOC4_NUM_SERIAL_PORTS; ii++) {
- the_port = &control->ic_port[ii].icp_uart_port;
- if (the_port) {
- uart_remove_one_port(&ioc4_uart, the_port);
- }
- port = control->ic_port[ii].icp_port;
- if (!(ii & 1) && port) {
- pci_free_consistent(port->ip_pdev,
- TOTAL_RING_BUF_SIZE,
- (void *)port->ip_cpu_ringbuf,
- port->ip_dma_ringbuf);
- kfree(port);
- }
- }
- soft = control->ic_soft;
- if (soft) {
- free_irq(control->ic_irq, (void *)soft);
- if (soft->is_ioc4_serial_addr) {
- release_region((unsigned long)
- soft->is_ioc4_serial_addr,
- sizeof(struct ioc4_serial));
- }
- kfree(soft);
- }
- kfree(control);
- idd->idd_serial_data = NULL;
-
- return 0;
-}
-
static struct ioc4_submodule ioc4_serial_submodule = {
.is_name = "IOC4_serial",
.is_owner = THIS_MODULE,
@@ -2796,9 +2876,15 @@
int ret;

/* register with serial core */
- if ((ret = uart_register_driver(&ioc4_uart)) < 0) {
+ if ((ret = uart_register_driver(&ioc4_uart_rs232)) < 0) {
+ printk(KERN_WARNING
+ "%s: Couldn't register rs232 IOC4 serial driver\n",
+ __FUNCTION__);
+ return ret;
+ }
+ if ((ret = uart_register_driver(&ioc4_uart_rs422)) < 0) {
printk(KERN_WARNING
- "%s: Couldn't register IOC4 serial driver\n",
+ "%s: Couldn't register rs422 IOC4 serial driver\n",
__FUNCTION__);
return ret;
}
@@ -2810,7 +2896,8 @@
static void __devexit ioc4_serial_exit(void)
{
ioc4_unregister_submodule(&ioc4_serial_submodule);
- uart_unregister_driver(&ioc4_uart);
+ uart_unregister_driver(&ioc4_uart_rs232);
+ uart_unregister_driver(&ioc4_uart_rs422);
}

module_init(ioc4_serial_init);
-
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