xref: /freebsd/share/man/man4/mx25l.4 (revision 4b9d6057) 
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25.Dd February 26, 2019
26.Dt MX25L 4
27.Os
28.Sh NAME
29.Nm mx25l
30.Nd driver for SpiFlash(tm) compatible non-volatile storage devices
31.Sh SYNOPSIS
32To compile this driver into the kernel,
33place the following line in your
34kernel configuration file:
35.Bd -ragged -offset indent
36.Cd "device mx25l"
37.Ed
38.Pp
39Alternatively, to load the driver as a
40module at boot time, place the following line in
41.Xr loader.conf 5 :
42.Bd -literal -offset indent
43mx25l_load="YES"
44.Ed
45.Sh DESCRIPTION
46The
47.Nm
48driver provides support for the family of non-volatile storage
49devices known collectively as SpiFlash(tm).
50SpiFlash chips typically have part numbers beginning with EN25,
51IS25, MX25, S25, SST25, or W25.
52.Pp
53The
54.Nm
55driver uses opcode 0x9f to read the manufacturer and device ID
56data to determine whether the device is supported.
57The device ID is looked up using a table of data within the driver
58which describes the attributes of each supported device,
59such as block size, sector size, and device capacity.
60When a supported device is found, the
61.Nm
62driver creates a disk device and makes it accessible at
63.Pa /dev/flash/mx25l? .
64The new disk device is then tasted by the available
65.Xr geom 4
66modules as with any disk device.
67.Sh HARDWARE
68The
69.Nm
70driver provides support for the following devices:
71.Pp
72.Bl -bullet -compact
73.It
74AT25DF641
75.It
76EN25F32
77.It
78EN25P32
79.It
80EN25P64
81.It
82EN25Q32
83.It
84EN25Q64
85.It
86GD25Q64
87.It
88M25P32
89.It
90M25P64
91.It
92MX25L1606E
93.It
94MX25LL128
95.It
96MX25LL256
97.It
98MX25LL32
99.It
100MX25LL64
101.It
102S25FL032
103.It
104S25FL064
105.It
106S25FL128
107.It
108S25FL256S
109.It
110SST25VF010A
111.It
112SST25VF032B
113.It
114W25Q128
115.It
116W25Q256
117.It
118W25Q32
119.It
120W25Q64
121.It
122W25Q64BV
123.It
124W25X32
125.It
126W25X64
127.El
128.Sh FDT CONFIGURATION
129On an
130.Xr fdt 4
131based system, the
132.Nm
133device is defined as a slave device subnode
134of the SPI bus controller node.
135All properties documented in the
136.Va spibus.txt
137bindings document can be used with the
138.Nm
139device.
140The most commonly-used ones are documented below.
141.Pp
142The following properties are required in the
143.Nm
144device subnode:
145.Bl -tag -width indent
146.It Va compatible
147Must be the string "jedec,spi-nor".
148.It Va reg
149Chip select address of device.
150.It Va spi-max-frequency
151The maximum bus frequency to use when communicating with this slave device.
152Actual bus speed may be lower, depending on the capabilities of the SPI
153bus controller hardware.
154.El
155.Pp
156The following properties are optional for the
157.Nm
158device subnode:
159.Bl -tag -width indent
160.It Va spi-cpha
161Empty property indicating the slave device requires shifted clock
162phase (CPHA) mode.
163.It Va spi-cpol
164Empty property indicating the slave device requires inverse clock
165polarity (CPOL) mode.
166.It Va spi-cs-high
167Empty property indicating the slave device requires chip select active high.
168.El
169.Sh HINTS CONFIGURATION
170On a
171.Xr device.hints 5
172based system, such as
173.Li MIPS ,
174these values are configurable for
175.Nm :
176.Bl -tag -width indent
177.It Va hint.mx25l.%d.at
178The spibus the
179.Nm
180instance is attached to.
181.It Va hint.mx25l.%d.clock
182The maximum bus frequency to use when communicating with this device.
183Actual bus speed may be lower, depending on the capabilities of the SPI
184bus controller hardware.
185.It Va hint.mx25l.%d.cs
186The chip-select number to assert when performing I/O for this device.
187Set the high bit (1 << 31) to invert the logic level of the chip select line.
188.It Va hint.mx25l.%d.mode
189The SPI mode (0-3) to use when communicating with this device.
190.El
191.Sh FILES
192.Bl -tag -width /dev/flash/mx25l?
193.It Pa /dev/flash/mx25l?
194Provides read/write access to the storage device.
195.It Pa /dev/flash/spi?
196An alias for the
197.Pa /dev/mx25l?
198device, for backwards compatibility with older versions of the driver.
199.El
200.Sh SEE ALSO
201.Xr fdt 4 ,
202.Xr geom 4
203.Sh HISTORY
204The
205.Nm
206driver first appeared in
207.Fx 8.0 .
208