Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 131 insertions, 0 deletions

diff --git a/Documentation/misc-devices/oxsemi-tornado.rst b/Documentation/misc-devices/oxsemi-tornado.rst
new file mode 100644
index 0000000000..b33351bef6
--- /dev/null
+++ b/Documentation/misc-devices/oxsemi-tornado.rst
@@ -0,0 +1,131 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+====================================================================
+Notes on Oxford Semiconductor PCIe (Tornado) 950 serial port devices
+====================================================================
+
+Oxford Semiconductor PCIe (Tornado) 950 serial port devices are driven
+by a fixed 62.5MHz clock input derived from the 100MHz PCI Express clock.
+
+The baud rate produced by the baud generator is obtained from this input
+frequency by dividing it by the clock prescaler, which can be set to any
+value from 1 to 63.875 in increments of 0.125, and then the usual 16-bit
+divisor is used as with the original 8250, to divide the frequency by a
+value from 1 to 65535.  Finally a programmable oversampling rate is used
+that can take any value from 4 to 16 to divide the frequency further and
+determine the actual baud rate used.  Baud rates from 15625000bps down
+to 0.933bps can be obtained this way.
+
+By default the oversampling rate is set to 16 and the clock prescaler is
+set to 33.875, meaning that the frequency to be used as the reference
+for the usual 16-bit divisor is 115313.653, which is close enough to the
+frequency of 115200 used by the original 8250 for the same values to be
+used for the divisor to obtain the requested baud rates by software that
+is unaware of the extra clock controls available.
+
+The oversampling rate is programmed with the TCR register and the clock
+prescaler is programmed with the CPR/CPR2 register pair [OX200]_ [OX952]_
+[OX954]_ [OX958]_.  To switch away from the default value of 33.875 for
+the prescaler the enhanced mode has to be explicitly enabled though, by
+setting bit 4 of the EFR.  In that mode setting bit 7 in the MCR enables
+the prescaler or otherwise it is bypassed as if the value of 1 was used.
+Additionally writing any value to CPR clears CPR2 for compatibility with
+old software written for older conventional PCI Oxford Semiconductor
+devices that do not have the extra prescaler's 9th bit in CPR2, so the
+CPR/CPR2 register pair has to be programmed in the right order.
+
+By using these parameters rates from 15625000bps down to 1bps can be
+obtained, with either exact or highly-accurate actual bit rates for
+standard and many non-standard rates.
+
+Here are the figures for the standard and some non-standard baud rates
+(including those quoted in Oxford Semiconductor documentation), giving
+the requested rate (r), the actual rate yielded (a) and its deviation
+from the requested rate (d), and the values of the oversampling rate
+(tcr), the clock prescaler (cpr) and the divisor (div) produced by the
+new ``get_divisor`` handler:
+
+::
+
+ r: 15625000, a: 15625000.00, d:  0.0000%, tcr:  4, cpr:  1.000, div:     1
+ r: 12500000, a: 12500000.00, d:  0.0000%, tcr:  5, cpr:  1.000, div:     1
+ r: 10416666, a: 10416666.67, d:  0.0000%, tcr:  6, cpr:  1.000, div:     1
+ r:  8928571, a:  8928571.43, d:  0.0000%, tcr:  7, cpr:  1.000, div:     1
+ r:  7812500, a:  7812500.00, d:  0.0000%, tcr:  8, cpr:  1.000, div:     1
+ r:  4000000, a:  4000000.00, d:  0.0000%, tcr:  5, cpr:  3.125, div:     1
+ r:  3686400, a:  3676470.59, d: -0.2694%, tcr:  8, cpr:  2.125, div:     1
+ r:  3500000, a:  3496503.50, d: -0.0999%, tcr: 13, cpr:  1.375, div:     1
+ r:  3000000, a:  2976190.48, d: -0.7937%, tcr: 14, cpr:  1.500, div:     1
+ r:  2500000, a:  2500000.00, d:  0.0000%, tcr: 10, cpr:  2.500, div:     1
+ r:  2000000, a:  2000000.00, d:  0.0000%, tcr: 10, cpr:  3.125, div:     1
+ r:  1843200, a:  1838235.29, d: -0.2694%, tcr: 16, cpr:  2.125, div:     1
+ r:  1500000, a:  1492537.31, d: -0.4975%, tcr:  5, cpr:  8.375, div:     1
+ r:  1152000, a:  1152073.73, d:  0.0064%, tcr: 14, cpr:  3.875, div:     1
+ r:   921600, a:   919117.65, d: -0.2694%, tcr: 16, cpr:  2.125, div:     2
+ r:   576000, a:   576036.87, d:  0.0064%, tcr: 14, cpr:  3.875, div:     2
+ r:   460800, a:   460829.49, d:  0.0064%, tcr:  7, cpr:  3.875, div:     5
+ r:   230400, a:   230414.75, d:  0.0064%, tcr: 14, cpr:  3.875, div:     5
+ r:   115200, a:   115207.37, d:  0.0064%, tcr: 14, cpr:  1.250, div:    31
+ r:    57600, a:    57603.69, d:  0.0064%, tcr:  8, cpr:  3.875, div:    35
+ r:    38400, a:    38402.46, d:  0.0064%, tcr: 14, cpr:  3.875, div:    30
+ r:    19200, a:    19201.23, d:  0.0064%, tcr:  8, cpr:  3.875, div:   105
+ r:     9600, a:     9600.06, d:  0.0006%, tcr:  9, cpr:  1.125, div:   643
+ r:     4800, a:     4799.98, d: -0.0004%, tcr:  7, cpr:  2.875, div:   647
+ r:     2400, a:     2400.02, d:  0.0008%, tcr:  9, cpr:  2.250, div:  1286
+ r:     1200, a:     1200.00, d:  0.0000%, tcr: 14, cpr:  2.875, div:  1294
+ r:      300, a:      300.00, d:  0.0000%, tcr: 11, cpr:  2.625, div:  7215
+ r:      200, a:      200.00, d:  0.0000%, tcr: 16, cpr:  1.250, div: 15625
+ r:      150, a:      150.00, d:  0.0000%, tcr: 13, cpr:  2.250, div: 14245
+ r:      134, a:      134.00, d:  0.0000%, tcr: 11, cpr:  2.625, div: 16153
+ r:      110, a:      110.00, d:  0.0000%, tcr: 12, cpr:  1.000, div: 47348
+ r:       75, a:       75.00, d:  0.0000%, tcr:  4, cpr:  5.875, div: 35461
+ r:       50, a:       50.00, d:  0.0000%, tcr: 16, cpr:  1.250, div: 62500
+ r:       25, a:       25.00, d:  0.0000%, tcr: 16, cpr:  2.500, div: 62500
+ r:        4, a:        4.00, d:  0.0000%, tcr: 16, cpr: 20.000, div: 48828
+ r:        2, a:        2.00, d:  0.0000%, tcr: 16, cpr: 40.000, div: 48828
+ r:        1, a:        1.00, d:  0.0000%, tcr: 16, cpr: 63.875, div: 61154
+
+With the baud base set to 15625000 and the unsigned 16-bit UART_DIV_MAX
+limitation imposed by ``serial8250_get_baud_rate`` standard baud rates
+below 300bps become unavailable in the regular way, e.g. the rate of
+200bps requires the baud base to be divided by 78125 and that is beyond
+the unsigned 16-bit range.  The historic spd_cust feature can still be
+used by encoding the values for, the prescaler, the oversampling rate
+and the clock divisor (DLM/DLL) as follows to obtain such rates if so
+required:
+
+::
+
+  31 29 28             20 19   16 15                            0
+ +-----+-----------------+-------+-------------------------------+
+ |0 0 0|    CPR2:CPR     |  TCR  |            DLM:DLL            |
+ +-----+-----------------+-------+-------------------------------+
+
+Use a value such encoded for the ``custom_divisor`` field along with the
+ASYNC_SPD_CUST flag set in the ``flags`` field in ``struct serial_struct``
+passed with the TIOCSSERIAL ioctl(2), such as with the setserial(8)
+utility and its ``divisor`` and ``spd_cust`` parameters, and then select
+the baud rate of 38400bps.  Note that the value of 0 in TCR sets the
+oversampling rate to 16 and prescaler values below 1 in CPR2/CPR are
+clamped by the driver to 1.
+
+For example the value of 0x1f4004e2 will set CPR2/CPR, TCR and DLM/DLL
+respectively to 0x1f4, 0x0 and 0x04e2, choosing the prescaler value,
+the oversampling rate and the clock divisor of 62.500, 16 and 1250
+respectively.  These parameters will set the baud rate for the serial
+port to 62500000 / 62.500 / 1250 / 16 = 50bps.
+
+Maciej W. Rozycki  <macro@orcam.me.uk>
+
+.. [OX200] "OXPCIe200 PCI Express Multi-Port Bridge", Oxford Semiconductor,
+   Inc., DS-0045, 10 Nov 2008, Section "950 Mode", pp. 64-65
+
+.. [OX952] "OXPCIe952 PCI Express Bridge to Dual Serial & Parallel Port",
+   Oxford Semiconductor, Inc., DS-0046, Mar 06 08, Section "950 Mode",
+   p. 20
+
+.. [OX954] "OXPCIe954 PCI Express Bridge to Quad Serial Port", Oxford
+   Semiconductor, Inc., DS-0047, Feb 08, Section "950 Mode", p. 20
+
+.. [OX958] "OXPCIe958 PCI Express Bridge to Octal Serial Port", Oxford
+   Semiconductor, Inc., DS-0048, Feb 08, Section "950 Mode", p. 20