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USB: serial: FTDI: add high speed device support
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Added support for FTDI's USB 2.0 hi-speed devices - FT2232H (2
interfaces) and FT4232H (4 interfaces), including a new baud rate
calculation for these devices which can now achieve up to 12Mbaud by
turning off a divide by 2.5 in the baud rate generator of the chips.  In
order to achieve baud rates of <1200 baud, the divide by 2.5 must be
active.  The default product ID of the FT2232H is 0x6010 (same as the
FT2232C IC).  The default PID of the FT4232H is 0x6011.


Signed-off-by: Mark J. Adamson <mark.adamson@ftdichip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Mark Adamson authored and Greg Kroah-Hartman committed Jun 16, 2009
1 parent a483d70 commit 094c2e6
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Showing 2 changed files with 89 additions and 11 deletions.
90 changes: 80 additions & 10 deletions drivers/usb/serial/ftdi_sio.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@
/*
* Version Information
*/
#define DRIVER_VERSION "v1.4.3"
#define DRIVER_VERSION "v1.5.0"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Bill Ryder <bryder@sgi.com>, Kuba Ober <kuba@mareimbrium.org>"
#define DRIVER_DESC "USB FTDI Serial Converters Driver"

Expand Down Expand Up @@ -82,7 +82,8 @@ struct ftdi_private {
int rx_processed;
unsigned long rx_bytes;

__u16 interface; /* FT2232C port interface (0 for FT232/245) */
__u16 interface; /* FT2232C, FT2232H or FT4232H port interface
(0 for FT232/245) */

speed_t force_baud; /* if non-zero, force the baud rate to
this value */
Expand Down Expand Up @@ -164,6 +165,7 @@ static struct usb_device_id id_table_combined [] = {
{ USB_DEVICE(FTDI_VID, FTDI_8U232AM_ALT_PID) },
{ USB_DEVICE(FTDI_VID, FTDI_232RL_PID) },
{ USB_DEVICE(FTDI_VID, FTDI_8U2232C_PID) },
{ USB_DEVICE(FTDI_VID, FTDI_4232H_PID) },
{ USB_DEVICE(FTDI_VID, FTDI_MICRO_CHAMELEON_PID) },
{ USB_DEVICE(FTDI_VID, FTDI_RELAIS_PID) },
{ USB_DEVICE(FTDI_VID, FTDI_OPENDCC_PID) },
Expand Down Expand Up @@ -694,6 +696,8 @@ static const char *ftdi_chip_name[] = {
[FT232BM] = "FT232BM",
[FT2232C] = "FT2232C",
[FT232RL] = "FT232RL",
[FT2232H] = "FT2232H",
[FT4232H] = "FT4232H"
};


Expand Down Expand Up @@ -745,6 +749,8 @@ static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base);
static unsigned short int ftdi_232am_baud_to_divisor(int baud);
static __u32 ftdi_232bm_baud_base_to_divisor(int baud, int base);
static __u32 ftdi_232bm_baud_to_divisor(int baud);
static __u32 ftdi_2232h_baud_base_to_divisor(int baud, int base);
static __u32 ftdi_2232h_baud_to_divisor(int baud);

static struct usb_serial_driver ftdi_sio_device = {
.driver = {
Expand Down Expand Up @@ -839,6 +845,36 @@ static __u32 ftdi_232bm_baud_to_divisor(int baud)
return ftdi_232bm_baud_base_to_divisor(baud, 48000000);
}

static __u32 ftdi_2232h_baud_base_to_divisor(int baud, int base)
{
static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
__u32 divisor;
int divisor3;

/* hi-speed baud rate is 10-bit sampling instead of 16-bit */
divisor3 = (base / 10 / baud) * 8;

divisor = divisor3 >> 3;
divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
/* Deal with special cases for highest baud rates. */
if (divisor == 1)
divisor = 0;
else if (divisor == 0x4001)
divisor = 1;
/*
* Set this bit to turn off a divide by 2.5 on baud rate generator
* This enables baud rates up to 12Mbaud but cannot reach below 1200
* baud with this bit set
*/
divisor |= 0x00020000;
return divisor;
}

static __u32 ftdi_2232h_baud_to_divisor(int baud)
{
return ftdi_2232h_baud_base_to_divisor(baud, 120000000);
}

#define set_mctrl(port, set) update_mctrl((port), (set), 0)
#define clear_mctrl(port, clear) update_mctrl((port), 0, (clear))

Expand Down Expand Up @@ -997,6 +1033,19 @@ static __u32 get_ftdi_divisor(struct tty_struct *tty,
baud = 9600;
}
break;
case FT2232H: /* FT2232H chip */
case FT4232H: /* FT4232H chip */
if ((baud <= 12000000) & (baud >= 1200)) {
div_value = ftdi_2232h_baud_to_divisor(baud);
} else if (baud < 1200) {
div_value = ftdi_232bm_baud_to_divisor(baud);
} else {
dbg("%s - Baud rate too high!", __func__);
div_value = ftdi_232bm_baud_to_divisor(9600);
div_okay = 0;
baud = 9600;
}
break;
} /* priv->chip_type */

if (div_okay) {
Expand Down Expand Up @@ -1197,14 +1246,29 @@ static void ftdi_determine_type(struct usb_serial_port *port)
if (interfaces > 1) {
int inter;

/* Multiple interfaces. Assume FT2232C. */
priv->chip_type = FT2232C;
/* Multiple interfaces.*/
if (version == 0x0800) {
priv->chip_type = FT4232H;
/* Hi-speed - baud clock runs at 120MHz */
priv->baud_base = 120000000 / 2;
} else if (version == 0x0700) {
priv->chip_type = FT2232H;
/* Hi-speed - baud clock runs at 120MHz */
priv->baud_base = 120000000 / 2;
} else
priv->chip_type = FT2232C;

/* Determine interface code. */
inter = serial->interface->altsetting->desc.bInterfaceNumber;
if (inter == 0)
priv->interface = PIT_SIOA;
else
priv->interface = PIT_SIOB;
if (inter == 0) {
priv->interface = INTERFACE_A;
} else if (inter == 1) {
priv->interface = INTERFACE_B;
} else if (inter == 2) {
priv->interface = INTERFACE_C;
} else if (inter == 3) {
priv->interface = INTERFACE_D;
}
/* BM-type devices have a bug where bcdDevice gets set
* to 0x200 when iSerialNumber is 0. */
if (version < 0x500) {
Expand Down Expand Up @@ -1315,7 +1379,9 @@ static int create_sysfs_attrs(struct usb_serial_port *port)
if ((!retval) &&
(priv->chip_type == FT232BM ||
priv->chip_type == FT2232C ||
priv->chip_type == FT232RL)) {
priv->chip_type == FT232RL ||
priv->chip_type == FT2232H ||
priv->chip_type == FT4232H)) {
retval = device_create_file(&port->dev,
&dev_attr_latency_timer);
}
Expand All @@ -1334,7 +1400,9 @@ static void remove_sysfs_attrs(struct usb_serial_port *port)
device_remove_file(&port->dev, &dev_attr_event_char);
if (priv->chip_type == FT232BM ||
priv->chip_type == FT2232C ||
priv->chip_type == FT232RL) {
priv->chip_type == FT232RL ||
priv->chip_type == FT2232H ||
priv->chip_type == FT4232H) {
device_remove_file(&port->dev, &dev_attr_latency_timer);
}
}
Expand Down Expand Up @@ -2333,6 +2401,8 @@ static int ftdi_tiocmget(struct tty_struct *tty, struct file *file)
case FT232BM:
case FT2232C:
case FT232RL:
case FT2232H:
case FT4232H:
/* the 8U232AM returns a two byte value (the sio is a 1 byte
value) - in the same format as the data returned from the in
point */
Expand Down
10 changes: 9 additions & 1 deletion drivers/usb/serial/ftdi_sio.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
* The device is based on the FTDI FT8U100AX chip. It has a DB25 on one side,
* USB on the other.
*
* Thanx to FTDI (http://www.ftdi.co.uk) for so kindly providing details
* Thanx to FTDI (http://www.ftdichip.com) for so kindly providing details
* of the protocol required to talk to the device and ongoing assistence
* during development.
*
Expand All @@ -28,6 +28,7 @@
#define FTDI_8U232AM_ALT_PID 0x6006 /* FTDI's alternate PID for above */
#define FTDI_8U2232C_PID 0x6010 /* Dual channel device */
#define FTDI_232RL_PID 0xFBFA /* Product ID for FT232RL */
#define FTDI_4232H_PID 0x6011 /* Quad channel hi-speed device */
#define FTDI_RELAIS_PID 0xFA10 /* Relais device from Rudolf Gugler */
#define FTDI_NF_RIC_VID 0x0DCD /* Vendor Id */
#define FTDI_NF_RIC_PID 0x0001 /* Product Id */
Expand Down Expand Up @@ -876,6 +877,11 @@
#define FTDI_SIO_SET_LATENCY_TIMER 9 /* Set the latency timer */
#define FTDI_SIO_GET_LATENCY_TIMER 10 /* Get the latency timer */

/* Interface indicies for FT2232, FT2232H and FT4232H devices*/
#define INTERFACE_A 1
#define INTERFACE_B 2
#define INTERFACE_C 3
#define INTERFACE_D 4

/*
* FIC / OpenMoko, Inc. http://wiki.openmoko.org/wiki/Neo1973_Debug_Board_v3
Expand Down Expand Up @@ -1039,6 +1045,8 @@ typedef enum {
FT232BM = 3,
FT2232C = 4,
FT232RL = 5,
FT2232H = 6,
FT4232H = 7
} ftdi_chip_type_t;

typedef enum {
Expand Down

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