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acpi_pld: Make it easier to define the ACPI USB device groups 

The Linux kernel can use the ACPI _PLD group information to
determine peer ports.  Currently to define the group information
the devicetree must provide a complete _PLD structure.  This
change pulls the group information into a separate structure that
can be defined in devicetree.  This makes it easier to set for
USB devices in devicetree that do not need a full custom PLD.

This was tested on a sarien board with the USB devices defined
by verifying that the USB 2/3 ports are correctly identified
with their peer in sysfs.

Change-Id: Ifd4cadf0f6c901eb3832ad4e1395904f99c2f5a0
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/29998
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Duncan Laurie 2018-12-01 17:14:35 -08:00 committed by Duncan Laurie
parent 1e64d2386a
commit e1eca1d91c
4 changed files with 33 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
src/arch/x86/acpi_pld.c
View File

@ -18,7 +18,8 @@
#include <arch/acpi.h>
#include <arch/acpi_pld.h>
int acpi_pld_fill_usb(struct acpi_pld *pld, enum acpi_upc_type type)
int acpi_pld_fill_usb(struct acpi_pld *pld, enum acpi_upc_type type,
struct acpi_pld_group *group)
{
if (!pld)
return -1;
@ -32,6 +33,8 @@ int acpi_pld_fill_usb(struct acpi_pld *pld, enum acpi_upc_type type)
pld->horizontal_position = PLD_HORIZONTAL_POSITION_CENTER;
pld->rotation = PLD_ROTATE_0;
pld->visible = 1;
pld->group.token = group->token;
pld->group.position = group->position;
/* Set the shape based on port type */
switch (type) {
@ -114,16 +117,16 @@ int acpi_pld_to_buffer(const struct acpi_pld *pld, uint8_t *buf, int buf_len)
/* [77:74] Shape */
buf[9] |= (pld->shape & 0xf) << 2;
/* [78] Group Orientation */
buf[9] |= (pld->group_orientation & 0x1) << 6;
/* [78] Orientation */
buf[9] |= (pld->orientation & 0x1) << 6;
/* [86:79] Group Token (incorrectly defined as 1 bit in ACPI 6.2A) */
buf[9] |= (pld->group_token & 0x1) << 7;
buf[10] |= (pld->group_token >> 0x1) & 0x7f;
buf[9] |= (pld->group.token & 0x1) << 7;
buf[10] |= (pld->group.token >> 0x1) & 0x7f;
/* [94:87] Group Position */
buf[10] |= (pld->group_position & 0x1) << 7;
buf[11] |= (pld->group_position >> 0x1) & 0x7f;
buf[10] |= (pld->group.position & 0x1) << 7;
buf[11] |= (pld->group.position >> 0x1) & 0x7f;
/* [95] Bay */
buf[11] |= (pld->bay & 0x1) << 7;

19
src/arch/x86/include/arch/acpi_pld.h
View File

@ -75,6 +75,17 @@ enum acpi_pld_rotate {
PLD_ROTATE_315
};
#define ACPI_PLD_GROUP(__token, __position) \
{ \
.token = __token, \
.position = __position, \
}
struct acpi_pld_group {
uint8_t token;
uint8_t position;
};
struct acpi_pld {
/* Color field can be explicitly ignored */
bool ignore_color;
@ -100,9 +111,8 @@ struct acpi_pld {
enum acpi_pld_rotate rotation;
/* Port grouping */
enum acpi_pld_orientation group_orientation;
uint8_t group_token;
uint8_t group_position;
enum acpi_pld_orientation orientation;
struct acpi_pld_group group;
uint8_t draw_order;
uint8_t cabinet_number;
uint8_t card_cage_number;
@ -112,7 +122,8 @@ struct acpi_pld {
};
/* Fill out PLD structure with defaults based on USB port type */
int acpi_pld_fill_usb(struct acpi_pld *pld, enum acpi_upc_type type);
int acpi_pld_fill_usb(struct acpi_pld *pld, enum acpi_upc_type type,
struct acpi_pld_group *group);
/* Turn PLD structure into a 20 byte ACPI buffer */
int acpi_pld_to_buffer(const struct acpi_pld *pld, uint8_t *buf, int buf_len);

8
src/drivers/usb/acpi/chip.h
View File

@ -46,7 +46,13 @@ struct drivers_usb_acpi_config {
*/
enum acpi_upc_type type;
/* Define a custom physical location for the port */
/* Group peer ports */
struct acpi_pld_group group;
/*
* Define a custom physical location for the port.
* If enabled, this takes precedence over the 'group' field.
*/
bool use_custom_pld;
struct acpi_pld custom_pld;

2
src/drivers/usb/acpi/usb_acpi.c
View File

@ -57,7 +57,7 @@ static void usb_acpi_fill_ssdt_generator(struct device *dev)
} else {
/* Fill PLD strucutre based on port type */
struct acpi_pld pld;
acpi_pld_fill_usb(&pld, config->type);
acpi_pld_fill_usb(&pld, config->type, &config->group);
acpigen_write_pld(&pld);
}