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cyclades.c
4183 lines (3664 loc) · 111 KB
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cyclades.c
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#undef BLOCKMOVE
#define Z_WAKE
#undef Z_EXT_CHARS_IN_BUFFER
/*
* This file contains the driver for the Cyclades async multiport
* serial boards.
*
* Initially written by Randolph Bentson <bentson@grieg.seaslug.org>.
* Modified and maintained by Marcio Saito <marcio@cyclades.com>.
*
* Copyright (C) 2007-2009 Jiri Slaby <jirislaby@gmail.com>
*
* Much of the design and some of the code came from serial.c
* which was copyright (C) 1991, 1992 Linus Torvalds. It was
* extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92,
* and then fixed as suggested by Michael K. Johnson 12/12/92.
* Converted to pci probing and cleaned up by Jiri Slaby.
*
*/
#define CY_VERSION "2.6"
/* If you need to install more boards than NR_CARDS, change the constant
in the definition below. No other change is necessary to support up to
eight boards. Beyond that you'll have to extend cy_isa_addresses. */
#define NR_CARDS 4
/*
If the total number of ports is larger than NR_PORTS, change this
constant in the definition below. No other change is necessary to
support more boards/ports. */
#define NR_PORTS 256
#define ZO_V1 0
#define ZO_V2 1
#define ZE_V1 2
#define SERIAL_PARANOIA_CHECK
#undef CY_DEBUG_OPEN
#undef CY_DEBUG_THROTTLE
#undef CY_DEBUG_OTHER
#undef CY_DEBUG_IO
#undef CY_DEBUG_COUNT
#undef CY_DEBUG_DTR
#undef CY_DEBUG_INTERRUPTS
#undef CY_16Y_HACK
#undef CY_ENABLE_MONITORING
#undef CY_PCI_DEBUG
/*
* Include section
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/cyclades.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <linux/firmware.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/stat.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
static void cy_send_xchar(struct tty_struct *tty, char ch);
#ifndef SERIAL_XMIT_SIZE
#define SERIAL_XMIT_SIZE (min(PAGE_SIZE, 4096))
#endif
#define STD_COM_FLAGS (0)
/* firmware stuff */
#define ZL_MAX_BLOCKS 16
#define DRIVER_VERSION 0x02010203
#define RAM_SIZE 0x80000
enum zblock_type {
ZBLOCK_PRG = 0,
ZBLOCK_FPGA = 1
};
struct zfile_header {
char name[64];
char date[32];
char aux[32];
u32 n_config;
u32 config_offset;
u32 n_blocks;
u32 block_offset;
u32 reserved[9];
} __attribute__ ((packed));
struct zfile_config {
char name[64];
u32 mailbox;
u32 function;
u32 n_blocks;
u32 block_list[ZL_MAX_BLOCKS];
} __attribute__ ((packed));
struct zfile_block {
u32 type;
u32 file_offset;
u32 ram_offset;
u32 size;
} __attribute__ ((packed));
static struct tty_driver *cy_serial_driver;
#ifdef CONFIG_ISA
/* This is the address lookup table. The driver will probe for
Cyclom-Y/ISA boards at all addresses in here. If you want the
driver to probe addresses at a different address, add it to
this table. If the driver is probing some other board and
causing problems, remove the offending address from this table.
*/
static unsigned int cy_isa_addresses[] = {
0xD0000,
0xD2000,
0xD4000,
0xD6000,
0xD8000,
0xDA000,
0xDC000,
0xDE000,
0, 0, 0, 0, 0, 0, 0, 0
};
#define NR_ISA_ADDRS ARRAY_SIZE(cy_isa_addresses)
static long maddr[NR_CARDS];
static int irq[NR_CARDS];
module_param_array(maddr, long, NULL, 0);
module_param_array(irq, int, NULL, 0);
#endif /* CONFIG_ISA */
/* This is the per-card data structure containing address, irq, number of
channels, etc. This driver supports a maximum of NR_CARDS cards.
*/
static struct cyclades_card cy_card[NR_CARDS];
static int cy_next_channel; /* next minor available */
/*
* This is used to look up the divisor speeds and the timeouts
* We're normally limited to 15 distinct baud rates. The extra
* are accessed via settings in info->port.flags.
* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
* 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
* HI VHI
* 20
*/
static const int baud_table[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
1800, 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200, 150000,
230400, 0
};
static const char baud_co_25[] = { /* 25 MHz clock option table */
/* value => 00 01 02 03 04 */
/* divide by 8 32 128 512 2048 */
0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x02,
0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const char baud_bpr_25[] = { /* 25 MHz baud rate period table */
0x00, 0xf5, 0xa3, 0x6f, 0x5c, 0x51, 0xf5, 0xa3, 0x51, 0xa3,
0x6d, 0x51, 0xa3, 0x51, 0xa3, 0x51, 0x36, 0x29, 0x1b, 0x15
};
static const char baud_co_60[] = { /* 60 MHz clock option table (CD1400 J) */
/* value => 00 01 02 03 04 */
/* divide by 8 32 128 512 2048 */
0x00, 0x00, 0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03,
0x03, 0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00
};
static const char baud_bpr_60[] = { /* 60 MHz baud rate period table (CD1400 J) */
0x00, 0x82, 0x21, 0xff, 0xdb, 0xc3, 0x92, 0x62, 0xc3, 0x62,
0x41, 0xc3, 0x62, 0xc3, 0x62, 0xc3, 0x82, 0x62, 0x41, 0x32,
0x21
};
static const char baud_cor3[] = { /* receive threshold */
0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x08, 0x08, 0x07,
0x07
};
/*
* The Cyclades driver implements HW flow control as any serial driver.
* The cyclades_port structure member rflow and the vector rflow_thr
* allows us to take advantage of a special feature in the CD1400 to avoid
* data loss even when the system interrupt latency is too high. These flags
* are to be used only with very special applications. Setting these flags
* requires the use of a special cable (DTR and RTS reversed). In the new
* CD1400-based boards (rev. 6.00 or later), there is no need for special
* cables.
*/
static const char rflow_thr[] = { /* rflow threshold */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
0x0a
};
/* The Cyclom-Ye has placed the sequential chips in non-sequential
* address order. This look-up table overcomes that problem.
*/
static const unsigned int cy_chip_offset[] = { 0x0000,
0x0400,
0x0800,
0x0C00,
0x0200,
0x0600,
0x0A00,
0x0E00
};
/* PCI related definitions */
#ifdef CONFIG_PCI
static const struct pci_device_id cy_pci_dev_id[] = {
/* PCI < 1Mb */
{ PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_Y_Lo) },
/* PCI > 1Mb */
{ PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_Y_Hi) },
/* 4Y PCI < 1Mb */
{ PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_4Y_Lo) },
/* 4Y PCI > 1Mb */
{ PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_4Y_Hi) },
/* 8Y PCI < 1Mb */
{ PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_8Y_Lo) },
/* 8Y PCI > 1Mb */
{ PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_8Y_Hi) },
/* Z PCI < 1Mb */
{ PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_Z_Lo) },
/* Z PCI > 1Mb */
{ PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_Z_Hi) },
{ } /* end of table */
};
MODULE_DEVICE_TABLE(pci, cy_pci_dev_id);
#endif
static void cy_start(struct tty_struct *);
static void cy_set_line_char(struct cyclades_port *, struct tty_struct *);
static int cyz_issue_cmd(struct cyclades_card *, __u32, __u8, __u32);
#ifdef CONFIG_ISA
static unsigned detect_isa_irq(void __iomem *);
#endif /* CONFIG_ISA */
#ifndef CONFIG_CYZ_INTR
static void cyz_poll(unsigned long);
/* The Cyclades-Z polling cycle is defined by this variable */
static long cyz_polling_cycle = CZ_DEF_POLL;
static DEFINE_TIMER(cyz_timerlist, cyz_poll, 0, 0);
#else /* CONFIG_CYZ_INTR */
static void cyz_rx_restart(unsigned long);
static struct timer_list cyz_rx_full_timer[NR_PORTS];
#endif /* CONFIG_CYZ_INTR */
static inline void cyy_writeb(struct cyclades_port *port, u32 reg, u8 val)
{
struct cyclades_card *card = port->card;
cy_writeb(port->u.cyy.base_addr + (reg << card->bus_index), val);
}
static inline u8 cyy_readb(struct cyclades_port *port, u32 reg)
{
struct cyclades_card *card = port->card;
return readb(port->u.cyy.base_addr + (reg << card->bus_index));
}
static inline bool cy_is_Z(struct cyclades_card *card)
{
return card->num_chips == (unsigned int)-1;
}
static inline bool __cyz_fpga_loaded(struct RUNTIME_9060 __iomem *ctl_addr)
{
return readl(&ctl_addr->init_ctrl) & (1 << 17);
}
static inline bool cyz_fpga_loaded(struct cyclades_card *card)
{
return __cyz_fpga_loaded(card->ctl_addr.p9060);
}
static inline bool cyz_is_loaded(struct cyclades_card *card)
{
struct FIRM_ID __iomem *fw_id = card->base_addr + ID_ADDRESS;
return (card->hw_ver == ZO_V1 || cyz_fpga_loaded(card)) &&
readl(&fw_id->signature) == ZFIRM_ID;
}
static inline int serial_paranoia_check(struct cyclades_port *info,
const char *name, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
if (!info) {
printk(KERN_WARNING "cyc Warning: null cyclades_port for (%s) "
"in %s\n", name, routine);
return 1;
}
if (info->magic != CYCLADES_MAGIC) {
printk(KERN_WARNING "cyc Warning: bad magic number for serial "
"struct (%s) in %s\n", name, routine);
return 1;
}
#endif
return 0;
}
/***********************************************************/
/********* Start of block of Cyclom-Y specific code ********/
/* This routine waits up to 1000 micro-seconds for the previous
command to the Cirrus chip to complete and then issues the
new command. An error is returned if the previous command
didn't finish within the time limit.
This function is only called from inside spinlock-protected code.
*/
static int __cyy_issue_cmd(void __iomem *base_addr, u8 cmd, int index)
{
void __iomem *ccr = base_addr + (CyCCR << index);
unsigned int i;
/* Check to see that the previous command has completed */
for (i = 0; i < 100; i++) {
if (readb(ccr) == 0)
break;
udelay(10L);
}
/* if the CCR never cleared, the previous command
didn't finish within the "reasonable time" */
if (i == 100)
return -1;
/* Issue the new command */
cy_writeb(ccr, cmd);
return 0;
}
static inline int cyy_issue_cmd(struct cyclades_port *port, u8 cmd)
{
return __cyy_issue_cmd(port->u.cyy.base_addr, cmd,
port->card->bus_index);
}
#ifdef CONFIG_ISA
/* ISA interrupt detection code */
static unsigned detect_isa_irq(void __iomem *address)
{
int irq;
unsigned long irqs, flags;
int save_xir, save_car;
int index = 0; /* IRQ probing is only for ISA */
/* forget possible initially masked and pending IRQ */
irq = probe_irq_off(probe_irq_on());
/* Clear interrupts on the board first */
cy_writeb(address + (Cy_ClrIntr << index), 0);
/* Cy_ClrIntr is 0x1800 */
irqs = probe_irq_on();
/* Wait ... */
msleep(5);
/* Enable the Tx interrupts on the CD1400 */
local_irq_save(flags);
cy_writeb(address + (CyCAR << index), 0);
__cyy_issue_cmd(address, CyCHAN_CTL | CyENB_XMTR, index);
cy_writeb(address + (CyCAR << index), 0);
cy_writeb(address + (CySRER << index),
readb(address + (CySRER << index)) | CyTxRdy);
local_irq_restore(flags);
/* Wait ... */
msleep(5);
/* Check which interrupt is in use */
irq = probe_irq_off(irqs);
/* Clean up */
save_xir = (u_char) readb(address + (CyTIR << index));
save_car = readb(address + (CyCAR << index));
cy_writeb(address + (CyCAR << index), (save_xir & 0x3));
cy_writeb(address + (CySRER << index),
readb(address + (CySRER << index)) & ~CyTxRdy);
cy_writeb(address + (CyTIR << index), (save_xir & 0x3f));
cy_writeb(address + (CyCAR << index), (save_car));
cy_writeb(address + (Cy_ClrIntr << index), 0);
/* Cy_ClrIntr is 0x1800 */
return (irq > 0) ? irq : 0;
}
#endif /* CONFIG_ISA */
static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
void __iomem *base_addr)
{
struct cyclades_port *info;
struct tty_struct *tty;
int len, index = cinfo->bus_index;
u8 ivr, save_xir, channel, save_car, data, char_count;
#ifdef CY_DEBUG_INTERRUPTS
printk(KERN_DEBUG "cyy_interrupt: rcvd intr, chip %d\n", chip);
#endif
/* determine the channel & change to that context */
save_xir = readb(base_addr + (CyRIR << index));
channel = save_xir & CyIRChannel;
info = &cinfo->ports[channel + chip * 4];
save_car = cyy_readb(info, CyCAR);
cyy_writeb(info, CyCAR, save_xir);
ivr = cyy_readb(info, CyRIVR) & CyIVRMask;
tty = tty_port_tty_get(&info->port);
/* if there is nowhere to put the data, discard it */
if (tty == NULL) {
if (ivr == CyIVRRxEx) { /* exception */
data = cyy_readb(info, CyRDSR);
} else { /* normal character reception */
char_count = cyy_readb(info, CyRDCR);
while (char_count--)
data = cyy_readb(info, CyRDSR);
}
goto end;
}
/* there is an open port for this data */
if (ivr == CyIVRRxEx) { /* exception */
data = cyy_readb(info, CyRDSR);
/* For statistics only */
if (data & CyBREAK)
info->icount.brk++;
else if (data & CyFRAME)
info->icount.frame++;
else if (data & CyPARITY)
info->icount.parity++;
else if (data & CyOVERRUN)
info->icount.overrun++;
if (data & info->ignore_status_mask) {
info->icount.rx++;
tty_kref_put(tty);
return;
}
if (tty_buffer_request_room(tty, 1)) {
if (data & info->read_status_mask) {
if (data & CyBREAK) {
tty_insert_flip_char(tty,
cyy_readb(info, CyRDSR),
TTY_BREAK);
info->icount.rx++;
if (info->port.flags & ASYNC_SAK)
do_SAK(tty);
} else if (data & CyFRAME) {
tty_insert_flip_char(tty,
cyy_readb(info, CyRDSR),
TTY_FRAME);
info->icount.rx++;
info->idle_stats.frame_errs++;
} else if (data & CyPARITY) {
/* Pieces of seven... */
tty_insert_flip_char(tty,
cyy_readb(info, CyRDSR),
TTY_PARITY);
info->icount.rx++;
info->idle_stats.parity_errs++;
} else if (data & CyOVERRUN) {
tty_insert_flip_char(tty, 0,
TTY_OVERRUN);
info->icount.rx++;
/* If the flip buffer itself is
overflowing, we still lose
the next incoming character.
*/
tty_insert_flip_char(tty,
cyy_readb(info, CyRDSR),
TTY_FRAME);
info->icount.rx++;
info->idle_stats.overruns++;
/* These two conditions may imply */
/* a normal read should be done. */
/* } else if(data & CyTIMEOUT) { */
/* } else if(data & CySPECHAR) { */
} else {
tty_insert_flip_char(tty, 0,
TTY_NORMAL);
info->icount.rx++;
}
} else {
tty_insert_flip_char(tty, 0, TTY_NORMAL);
info->icount.rx++;
}
} else {
/* there was a software buffer overrun and nothing
* could be done about it!!! */
info->icount.buf_overrun++;
info->idle_stats.overruns++;
}
} else { /* normal character reception */
/* load # chars available from the chip */
char_count = cyy_readb(info, CyRDCR);
#ifdef CY_ENABLE_MONITORING
++info->mon.int_count;
info->mon.char_count += char_count;
if (char_count > info->mon.char_max)
info->mon.char_max = char_count;
info->mon.char_last = char_count;
#endif
len = tty_buffer_request_room(tty, char_count);
while (len--) {
data = cyy_readb(info, CyRDSR);
tty_insert_flip_char(tty, data, TTY_NORMAL);
info->idle_stats.recv_bytes++;
info->icount.rx++;
#ifdef CY_16Y_HACK
udelay(10L);
#endif
}
info->idle_stats.recv_idle = jiffies;
}
tty_schedule_flip(tty);
tty_kref_put(tty);
end:
/* end of service */
cyy_writeb(info, CyRIR, save_xir & 0x3f);
cyy_writeb(info, CyCAR, save_car);
}
static void cyy_chip_tx(struct cyclades_card *cinfo, unsigned int chip,
void __iomem *base_addr)
{
struct cyclades_port *info;
struct tty_struct *tty;
int char_count, index = cinfo->bus_index;
u8 save_xir, channel, save_car, outch;
/* Since we only get here when the transmit buffer
is empty, we know we can always stuff a dozen
characters. */
#ifdef CY_DEBUG_INTERRUPTS
printk(KERN_DEBUG "cyy_interrupt: xmit intr, chip %d\n", chip);
#endif
/* determine the channel & change to that context */
save_xir = readb(base_addr + (CyTIR << index));
channel = save_xir & CyIRChannel;
save_car = readb(base_addr + (CyCAR << index));
cy_writeb(base_addr + (CyCAR << index), save_xir);
info = &cinfo->ports[channel + chip * 4];
tty = tty_port_tty_get(&info->port);
if (tty == NULL) {
cyy_writeb(info, CySRER, cyy_readb(info, CySRER) & ~CyTxRdy);
goto end;
}
/* load the on-chip space for outbound data */
char_count = info->xmit_fifo_size;
if (info->x_char) { /* send special char */
outch = info->x_char;
cyy_writeb(info, CyTDR, outch);
char_count--;
info->icount.tx++;
info->x_char = 0;
}
if (info->breakon || info->breakoff) {
if (info->breakon) {
cyy_writeb(info, CyTDR, 0);
cyy_writeb(info, CyTDR, 0x81);
info->breakon = 0;
char_count -= 2;
}
if (info->breakoff) {
cyy_writeb(info, CyTDR, 0);
cyy_writeb(info, CyTDR, 0x83);
info->breakoff = 0;
char_count -= 2;
}
}
while (char_count-- > 0) {
if (!info->xmit_cnt) {
if (cyy_readb(info, CySRER) & CyTxMpty) {
cyy_writeb(info, CySRER,
cyy_readb(info, CySRER) & ~CyTxMpty);
} else {
cyy_writeb(info, CySRER, CyTxMpty |
(cyy_readb(info, CySRER) & ~CyTxRdy));
}
goto done;
}
if (info->port.xmit_buf == NULL) {
cyy_writeb(info, CySRER,
cyy_readb(info, CySRER) & ~CyTxRdy);
goto done;
}
if (tty->stopped || tty->hw_stopped) {
cyy_writeb(info, CySRER,
cyy_readb(info, CySRER) & ~CyTxRdy);
goto done;
}
/* Because the Embedded Transmit Commands have been enabled,
* we must check to see if the escape character, NULL, is being
* sent. If it is, we must ensure that there is room for it to
* be doubled in the output stream. Therefore we no longer
* advance the pointer when the character is fetched, but
* rather wait until after the check for a NULL output
* character. This is necessary because there may not be room
* for the two chars needed to send a NULL.)
*/
outch = info->port.xmit_buf[info->xmit_tail];
if (outch) {
info->xmit_cnt--;
info->xmit_tail = (info->xmit_tail + 1) &
(SERIAL_XMIT_SIZE - 1);
cyy_writeb(info, CyTDR, outch);
info->icount.tx++;
} else {
if (char_count > 1) {
info->xmit_cnt--;
info->xmit_tail = (info->xmit_tail + 1) &
(SERIAL_XMIT_SIZE - 1);
cyy_writeb(info, CyTDR, outch);
cyy_writeb(info, CyTDR, 0);
info->icount.tx++;
char_count--;
}
}
}
done:
tty_wakeup(tty);
tty_kref_put(tty);
end:
/* end of service */
cyy_writeb(info, CyTIR, save_xir & 0x3f);
cyy_writeb(info, CyCAR, save_car);
}
static void cyy_chip_modem(struct cyclades_card *cinfo, int chip,
void __iomem *base_addr)
{
struct cyclades_port *info;
struct tty_struct *tty;
int index = cinfo->bus_index;
u8 save_xir, channel, save_car, mdm_change, mdm_status;
/* determine the channel & change to that context */
save_xir = readb(base_addr + (CyMIR << index));
channel = save_xir & CyIRChannel;
info = &cinfo->ports[channel + chip * 4];
save_car = cyy_readb(info, CyCAR);
cyy_writeb(info, CyCAR, save_xir);
mdm_change = cyy_readb(info, CyMISR);
mdm_status = cyy_readb(info, CyMSVR1);
tty = tty_port_tty_get(&info->port);
if (!tty)
goto end;
if (mdm_change & CyANY_DELTA) {
/* For statistics only */
if (mdm_change & CyDCD)
info->icount.dcd++;
if (mdm_change & CyCTS)
info->icount.cts++;
if (mdm_change & CyDSR)
info->icount.dsr++;
if (mdm_change & CyRI)
info->icount.rng++;
wake_up_interruptible(&info->port.delta_msr_wait);
}
if ((mdm_change & CyDCD) && (info->port.flags & ASYNC_CHECK_CD)) {
if (mdm_status & CyDCD)
wake_up_interruptible(&info->port.open_wait);
else
tty_hangup(tty);
}
if ((mdm_change & CyCTS) && tty_port_cts_enabled(&info->port)) {
if (tty->hw_stopped) {
if (mdm_status & CyCTS) {
/* cy_start isn't used
because... !!! */
tty->hw_stopped = 0;
cyy_writeb(info, CySRER,
cyy_readb(info, CySRER) | CyTxRdy);
tty_wakeup(tty);
}
} else {
if (!(mdm_status & CyCTS)) {
/* cy_stop isn't used
because ... !!! */
tty->hw_stopped = 1;
cyy_writeb(info, CySRER,
cyy_readb(info, CySRER) & ~CyTxRdy);
}
}
}
/* if (mdm_change & CyDSR) {
}
if (mdm_change & CyRI) {
}*/
tty_kref_put(tty);
end:
/* end of service */
cyy_writeb(info, CyMIR, save_xir & 0x3f);
cyy_writeb(info, CyCAR, save_car);
}
/* The real interrupt service routine is called
whenever the card wants its hand held--chars
received, out buffer empty, modem change, etc.
*/
static irqreturn_t cyy_interrupt(int irq, void *dev_id)
{
int status;
struct cyclades_card *cinfo = dev_id;
void __iomem *base_addr, *card_base_addr;
unsigned int chip, too_many, had_work;
int index;
if (unlikely(cinfo == NULL)) {
#ifdef CY_DEBUG_INTERRUPTS
printk(KERN_DEBUG "cyy_interrupt: spurious interrupt %d\n",
irq);
#endif
return IRQ_NONE; /* spurious interrupt */
}
card_base_addr = cinfo->base_addr;
index = cinfo->bus_index;
/* card was not initialized yet (e.g. DEBUG_SHIRQ) */
if (unlikely(card_base_addr == NULL))
return IRQ_HANDLED;
/* This loop checks all chips in the card. Make a note whenever
_any_ chip had some work to do, as this is considered an
indication that there will be more to do. Only when no chip
has any work does this outermost loop exit.
*/
do {
had_work = 0;
for (chip = 0; chip < cinfo->num_chips; chip++) {
base_addr = cinfo->base_addr +
(cy_chip_offset[chip] << index);
too_many = 0;
while ((status = readb(base_addr +
(CySVRR << index))) != 0x00) {
had_work++;
/* The purpose of the following test is to ensure that
no chip can monopolize the driver. This forces the
chips to be checked in a round-robin fashion (after
draining each of a bunch (1000) of characters).
*/
if (1000 < too_many++)
break;
spin_lock(&cinfo->card_lock);
if (status & CySRReceive) /* rx intr */
cyy_chip_rx(cinfo, chip, base_addr);
if (status & CySRTransmit) /* tx intr */
cyy_chip_tx(cinfo, chip, base_addr);
if (status & CySRModem) /* modem intr */
cyy_chip_modem(cinfo, chip, base_addr);
spin_unlock(&cinfo->card_lock);
}
}
} while (had_work);
/* clear interrupts */
spin_lock(&cinfo->card_lock);
cy_writeb(card_base_addr + (Cy_ClrIntr << index), 0);
/* Cy_ClrIntr is 0x1800 */
spin_unlock(&cinfo->card_lock);
return IRQ_HANDLED;
} /* cyy_interrupt */
static void cyy_change_rts_dtr(struct cyclades_port *info, unsigned int set,
unsigned int clear)
{
struct cyclades_card *card = info->card;
int channel = info->line - card->first_line;
u32 rts, dtr, msvrr, msvrd;
channel &= 0x03;
if (info->rtsdtr_inv) {
msvrr = CyMSVR2;
msvrd = CyMSVR1;
rts = CyDTR;
dtr = CyRTS;
} else {
msvrr = CyMSVR1;
msvrd = CyMSVR2;
rts = CyRTS;
dtr = CyDTR;
}
if (set & TIOCM_RTS) {
cyy_writeb(info, CyCAR, channel);
cyy_writeb(info, msvrr, rts);
}
if (clear & TIOCM_RTS) {
cyy_writeb(info, CyCAR, channel);
cyy_writeb(info, msvrr, ~rts);
}
if (set & TIOCM_DTR) {
cyy_writeb(info, CyCAR, channel);
cyy_writeb(info, msvrd, dtr);
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:set_modem_info raising DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
cyy_readb(info, CyMSVR1),
cyy_readb(info, CyMSVR2));
#endif
}
if (clear & TIOCM_DTR) {
cyy_writeb(info, CyCAR, channel);
cyy_writeb(info, msvrd, ~dtr);
#ifdef CY_DEBUG_DTR
printk(KERN_DEBUG "cyc:set_modem_info dropping DTR\n");
printk(KERN_DEBUG " status: 0x%x, 0x%x\n",
cyy_readb(info, CyMSVR1),
cyy_readb(info, CyMSVR2));
#endif
}
}
/***********************************************************/
/********* End of block of Cyclom-Y specific code **********/
/******** Start of block of Cyclades-Z specific code *******/
/***********************************************************/
static int
cyz_fetch_msg(struct cyclades_card *cinfo,
__u32 *channel, __u8 *cmd, __u32 *param)
{
struct BOARD_CTRL __iomem *board_ctrl = cinfo->board_ctrl;
unsigned long loc_doorbell;
loc_doorbell = readl(&cinfo->ctl_addr.p9060->loc_doorbell);
if (loc_doorbell) {
*cmd = (char)(0xff & loc_doorbell);
*channel = readl(&board_ctrl->fwcmd_channel);
*param = (__u32) readl(&board_ctrl->fwcmd_param);
cy_writel(&cinfo->ctl_addr.p9060->loc_doorbell, 0xffffffff);
return 1;
}
return 0;
} /* cyz_fetch_msg */
static int
cyz_issue_cmd(struct cyclades_card *cinfo,
__u32 channel, __u8 cmd, __u32 param)
{
struct BOARD_CTRL __iomem *board_ctrl = cinfo->board_ctrl;
__u32 __iomem *pci_doorbell;
unsigned int index;
if (!cyz_is_loaded(cinfo))
return -1;
index = 0;
pci_doorbell = &cinfo->ctl_addr.p9060->pci_doorbell;
while ((readl(pci_doorbell) & 0xff) != 0) {
if (index++ == 1000)
return (int)(readl(pci_doorbell) & 0xff);
udelay(50L);
}
cy_writel(&board_ctrl->hcmd_channel, channel);
cy_writel(&board_ctrl->hcmd_param, param);
cy_writel(pci_doorbell, (long)cmd);
return 0;
} /* cyz_issue_cmd */
static void cyz_handle_rx(struct cyclades_port *info, struct tty_struct *tty)
{
struct BUF_CTRL __iomem *buf_ctrl = info->u.cyz.buf_ctrl;
struct cyclades_card *cinfo = info->card;
unsigned int char_count;
int len;
#ifdef BLOCKMOVE
unsigned char *buf;
#else
char data;
#endif
__u32 rx_put, rx_get, new_rx_get, rx_bufsize, rx_bufaddr;
rx_get = new_rx_get = readl(&buf_ctrl->rx_get);
rx_put = readl(&buf_ctrl->rx_put);
rx_bufsize = readl(&buf_ctrl->rx_bufsize);
rx_bufaddr = readl(&buf_ctrl->rx_bufaddr);
if (rx_put >= rx_get)
char_count = rx_put - rx_get;
else
char_count = rx_put - rx_get + rx_bufsize;
if (char_count) {
#ifdef CY_ENABLE_MONITORING
info->mon.int_count++;
info->mon.char_count += char_count;
if (char_count > info->mon.char_max)
info->mon.char_max = char_count;
info->mon.char_last = char_count;
#endif
if (tty == NULL) {
/* flush received characters */
new_rx_get = (new_rx_get + char_count) &
(rx_bufsize - 1);
info->rflush_count++;
} else {
#ifdef BLOCKMOVE
/* we'd like to use memcpy(t, f, n) and memset(s, c, count)
for performance, but because of buffer boundaries, there
may be several steps to the operation */
while (1) {
len = tty_prepare_flip_string(tty, &buf,
char_count);
if (!len)
break;
len = min_t(unsigned int, min(len, char_count),
rx_bufsize - new_rx_get);
memcpy_fromio(buf, cinfo->base_addr +
rx_bufaddr + new_rx_get, len);
new_rx_get = (new_rx_get + len) &
(rx_bufsize - 1);
char_count -= len;
info->icount.rx += len;
info->idle_stats.recv_bytes += len;
}
#else
len = tty_buffer_request_room(tty, char_count);
while (len--) {
data = readb(cinfo->base_addr + rx_bufaddr +
new_rx_get);
new_rx_get = (new_rx_get + 1) &
(rx_bufsize - 1);
tty_insert_flip_char(tty, data, TTY_NORMAL);
info->idle_stats.recv_bytes++;
info->icount.rx++;
}
#endif
#ifdef CONFIG_CYZ_INTR
/* Recalculate the number of chars in the RX buffer and issue
a cmd in case it's higher than the RX high water mark */
rx_put = readl(&buf_ctrl->rx_put);