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annotate linux-patch/minpatch-4.9.240/0003-USB-serial-ftdi_sio-add-support-for-FreeCalypso-DUAR.patch @ 176:fb2f6497ba53 default tip

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doc/Linux-DTR-RTS-flaw: point to new location of this article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 11 Dec 2023 19:37:20 +0000
parents d7a1e7a6d6ba
children
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83
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1 From 8edb5017764d4ad9d90a631c420caca41827cd6e Mon Sep 17 00:00:00 2001
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2 From: "Mychaela N. Falconia" <falcon@freecalypso.org>
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3 Date: Fri, 2 Oct 2020 18:01:12 +0000
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4 Subject: [PATCH 3/3] USB: serial: ftdi_sio: add support for FreeCalypso
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5 DUART28C adapter
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6
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7 FreeCalypso DUART28C is an FT2232D-based USB to dual UART adapter
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8 with a special quirk: Channel B RTS and DTR outputs (BDBUS2 and BDBUS4
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9 on the chip) have been repurposed to drive PWON and RESET controls
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10 on Calypso targets. The circuit is wired such that BDBUS[24] high
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11 (RTS/DTR inactive) is the normal state with Iota VRPC controls
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12 NOT activated, whereas BDBUS[24] low (RTS or DTR active) turn ON
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13 the corresponding open drain control signal drivers.
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14
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15 A special ftdi_sio driver quirk is needed in order to suppress
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16 automatic assertion of DTR & RTS on device open: this device's
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17 special PWON and RESET control drivers MUST NOT be activated
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18 when the port is ordinarily opened for plain serial communication,
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19 instead they must only be activated when a special userspace
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20 application explicitly requests such activation with a TIOCMBIS ioctl.
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21 These special userspace applications are responsible for making the
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22 needed pulse with a TIOCMBIS, delay, TIOCMBIC sequence.
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23
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24 The special quirk is conditionalized on the DUART28C adapter's custom
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25 USB ID, and is further limited to FT2232D Channel B only: Channel A
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26 is wired normally, with the chip's ADBUS2 and ADBUS4 outputs
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27 actually being RTS and DTR rather than something else.
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28
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29 Signed-off-by: Mychaela N. Falconia <falcon@freecalypso.org>
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30 ---
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31 drivers/usb/serial/ftdi_sio.c | 61 +++++++++++++++++++++++++++++++++++----
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32 drivers/usb/serial/ftdi_sio_ids.h | 1 +
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33 2 files changed, 57 insertions(+), 5 deletions(-)
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34
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35 diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
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36 index 878ab4e5625c..443aee847556 100644
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37 --- a/drivers/usb/serial/ftdi_sio.c
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38 +++ b/drivers/usb/serial/ftdi_sio.c
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39 @@ -73,6 +73,8 @@ struct ftdi_private {
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40 this value */
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41 int force_rtscts; /* if non-zero, force RTS-CTS to always
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42 be enabled */
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43 + int no_auto_dtr_rts; /* if non-zero, suppress automatic assertion
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44 + of DTR & RTS on device open */
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45
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46 unsigned int latency; /* latency setting in use */
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47 unsigned short max_packet_size;
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48 @@ -92,6 +94,7 @@ static int ftdi_stmclite_probe(struct usb_serial *serial);
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49 static int ftdi_8u2232c_probe(struct usb_serial *serial);
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50 static void ftdi_USB_UIRT_setup(struct usb_serial_port *port);
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51 static void ftdi_HE_TIRA1_setup(struct usb_serial_port *port);
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52 +static void ftdi_duart28c_setup(struct usb_serial_port *port);
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53
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54 static const struct ftdi_sio_quirk ftdi_jtag_quirk = {
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55 .probe = ftdi_jtag_probe,
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56 @@ -117,6 +120,10 @@ static const struct ftdi_sio_quirk ftdi_8u2232c_quirk = {
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57 .probe = ftdi_8u2232c_probe,
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58 };
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59
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60 +static const struct ftdi_sio_quirk ftdi_duart28c_quirk = {
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61 + .port_probe = ftdi_duart28c_setup,
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62 +};
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63 +
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64 /*
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65 * The 8U232AM has the same API as the sio except for:
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66 * - it can support MUCH higher baudrates; up to:
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67 @@ -1037,6 +1044,8 @@ static const struct usb_device_id id_table_combined[] = {
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68 .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
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69 { USB_DEVICE(FTDI_VID, FTDI_FALCONIA_JTAG_UNBUF_PID),
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70 .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
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71 + { USB_DEVICE(FTDI_VID, FTDI_FALCONIA_DUART28C_PID),
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72 + .driver_info = (kernel_ulong_t)&ftdi_duart28c_quirk },
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73 { } /* Terminating entry */
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74 };
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75
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76 @@ -1961,6 +1970,39 @@ static int ftdi_stmclite_probe(struct usb_serial *serial)
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77 return 0;
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78 }
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79
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80 +/*
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81 + * FreeCalypso DUART28C is an FT2232D-based USB to dual UART adapter
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82 + * with a special quirk: Channel B RTS and DTR outputs (BDBUS2 and BDBUS4
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83 + * on the chip) have been repurposed to drive PWON and RESET controls
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84 + * on Calypso targets. The circuit is wired such that BDBUS[24] high
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85 + * (RTS/DTR inactive) is the normal state with Iota VRPC controls
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86 + * NOT activated, whereas BDBUS[24] low (RTS or DTR active) turn ON
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87 + * the corresponding open drain control signal drivers.
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88 + *
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89 + * A special ftdi_sio driver quirk is needed in order to suppress
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90 + * automatic assertion of DTR & RTS on device open: this device's
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91 + * special PWON and RESET control drivers MUST NOT be activated
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92 + * when the port is ordinarily opened for plain serial communication,
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93 + * instead they must only be activated when a special userspace
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94 + * application explicitly requests such activation with a TIOCMBIS ioctl.
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Mychaela Falconia <falcon@freecalypso.org>
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95 + * These special userspace applications are responsible for making the
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96 + * needed pulse with a TIOCMBIS, delay, TIOCMBIC sequence.
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97 + *
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98 + * The special quirk must be applied only to FT2232D Channel B:
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99 + * Channel A is wired normally, with the chip's ADBUS2 and ADBUS4 outputs
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100 + * actually being RTS and DTR rather than something else.
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101 + */
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102 +static void ftdi_duart28c_setup(struct usb_serial_port *port)
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103 +{
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104 + struct ftdi_private *priv = usb_get_serial_port_data(port);
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105 + struct usb_serial *serial = port->serial;
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106 + struct usb_interface *intf = serial->interface;
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107 + int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
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108 +
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109 + if (ifnum == 1)
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110 + priv->no_auto_dtr_rts = 1;
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111 +}
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112 +
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113 static int ftdi_sio_port_remove(struct usb_serial_port *port)
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114 {
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115 struct ftdi_private *priv = usb_get_serial_port_data(port);
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116 @@ -2010,10 +2052,18 @@ static void ftdi_dtr_rts(struct usb_serial_port *port, int on)
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117 dev_err(&port->dev, "error from flowcontrol urb\n");
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118 }
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119 }
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120 - /* drop RTS and DTR */
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121 - if (on)
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122 - set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
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123 - else
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124 + /*
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125 + * Assert or negate RTS and DTR as requested. When DUART28C
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126 + * quirk is applied, we suppress automatic assertion, but
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127 + * automatic negation on device close is retained - these
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128 + * special control signals are meant to be pulsed, and leaving
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129 + * either of them stuck on when the responsible userspace
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130 + * program has terminated unexpectedly is undesirable.
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131 + */
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132 + if (on) {
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133 + if (!priv->no_auto_dtr_rts)
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134 + set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
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135 + } else
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136 clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
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137 }
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138
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139 @@ -2355,7 +2405,8 @@ static void ftdi_set_termios(struct tty_struct *tty,
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140 dev_err(ddev, "%s urb failed to set baudrate\n", __func__);
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141 mutex_unlock(&priv->cfg_lock);
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142 /* Ensure RTS and DTR are raised when baudrate changed from 0 */
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143 - if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
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144 + if (old_termios && (old_termios->c_cflag & CBAUD) == B0
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145 + && !priv->no_auto_dtr_rts)
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146 set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
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147 }
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148
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149 diff --git a/drivers/usb/serial/ftdi_sio_ids.h b/drivers/usb/serial/ftdi_sio_ids.h
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150 index f3302516a1e4..f756b80cb361 100644
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151 --- a/drivers/usb/serial/ftdi_sio_ids.h
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152 +++ b/drivers/usb/serial/ftdi_sio_ids.h
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153 @@ -44,6 +44,7 @@
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154 */
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155 #define FTDI_FALCONIA_JTAG_BUF_PID 0x7150
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156 #define FTDI_FALCONIA_JTAG_UNBUF_PID 0x7151
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157 +#define FTDI_FALCONIA_DUART28C_PID 0x7152
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158
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159 /* Sienna Serial Interface by Secyourit GmbH */
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160 #define FTDI_SIENNA_PID 0x8348
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161 --
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162 2.9.0
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163