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tty: amba-pl011: probe ZTE device from AMBA bus with a pseudo-ID

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There is no Peripheral Identification Registers on ZTE PL011 device, so
although the driver amba-pl011 is ready to work for ZTE device, the
device cannot be probed by the driver at all.

With arm,primecell-periphid DT bindings (bindings/arm/primecell.txt) in
place, it should be the cleanest the way to use a pseudo-ID to probe the
device from AMBA bus.  We create an unofficial vendor number
AMBA_VENDOR_LINUX, which will practically never become an official
vendor ID, and takes Configuration, Revision number, and Part number as
input to compose a pseudo-ID for ZTE device.

Also, since we start using vendor_zte to probe ZTE device, the
__maybe_unused for vendor_zte is removed.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shawn Guo 2016-07-08 17:00:41 +08:00 committed by Greg Kroah-Hartman
parent 9c267ddb41
commit 2426fbc77f
2 changed files with 12 additions and 1 deletions
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7
drivers/tty/serial/amba-pl011.c
View file

@ -209,7 +209,7 @@ static unsigned int get_fifosize_zte(struct amba_device *dev)
return 16;
}
static struct vendor_data vendor_zte __maybe_unused = {
static struct vendor_data vendor_zte = {
.reg_offset = pl011_zte_offsets,
.access_32b = true,
.ifls = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
@ -2652,6 +2652,11 @@ static struct amba_id pl011_ids[] = {
.mask = 0x00ffffff,
.data = &vendor_st,
},
{
.id = AMBA_LINUX_ID(0x00, 0x1, 0xffe),
.mask = 0x00ffffff,
.data = &vendor_zte,
},
{ 0, 0 },
};

6
include/linux/amba/bus.h
View file

@ -53,8 +53,14 @@ enum amba_vendor {
AMBA_VENDOR_ST = 0x80,
AMBA_VENDOR_QCOM = 0x51,
AMBA_VENDOR_LSI = 0xb6,
AMBA_VENDOR_LINUX = 0xfe, /* This value is not official */
};
/* This is used to generate pseudo-ID for AMBA device */
#define AMBA_LINUX_ID(conf, rev, part) \
(((conf) & 0xff) << 24 | ((rev) & 0xf) << 20 | \
AMBA_VENDOR_LINUX << 12 | ((part) & 0xfff))
extern struct bus_type amba_bustype;
#define to_amba_device(d) container_of(d, struct amba_device, dev)