381 lines
9.6 KiB
Diff
381 lines
9.6 KiB
Diff
From: Andreas Noever <andreas.noever@gmail.com>
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Date: Thu, 12 Jun 2014 23:11:46 +0200
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Subject: [14/31] thunderbolt: Read port configuration from eeprom.
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Origin: https://git.kernel.org/linus/cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6
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All Thunderbolt switches (except the root switch) contain a drom which
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contains information about the device. Right now we only read the UID.
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Add code to read and parse this drom. For now we are only interested in
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which ports are disabled and which ports are "dual link ports" (a
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physical thunderbolt port/socket contains two such ports).
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Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/thunderbolt/eeprom.c | 266 ++++++++++++++++++++++++++++++++++++++++++-
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drivers/thunderbolt/switch.c | 4 +-
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drivers/thunderbolt/tb.h | 7 +-
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3 files changed, 270 insertions(+), 7 deletions(-)
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diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c
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index f28e402..0d5a80b 100644
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--- a/drivers/thunderbolt/eeprom.c
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+++ b/drivers/thunderbolt/eeprom.c
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@@ -4,6 +4,7 @@
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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*/
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+#include <linux/crc32.h>
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#include "tb.h"
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/**
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@@ -152,9 +153,86 @@ static int tb_eeprom_read_n(struct tb_switch *sw, u16 offset, u8 *val,
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return tb_eeprom_active(sw, false);
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}
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-int tb_eeprom_read_uid(struct tb_switch *sw, u64 *uid)
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+static u8 tb_crc8(u8 *data, int len)
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+{
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+ int i, j;
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+ u8 val = 0xff;
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+ for (i = 0; i < len; i++) {
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+ val ^= data[i];
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+ for (j = 0; j < 8; j++)
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+ val = (val << 1) ^ ((val & 0x80) ? 7 : 0);
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+ }
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+ return val;
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+}
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+
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+static u32 tb_crc32(void *data, size_t len)
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+{
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+ return ~__crc32c_le(~0, data, len);
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+}
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+
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+#define TB_DROM_DATA_START 13
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+struct tb_drom_header {
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+ /* BYTE 0 */
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+ u8 uid_crc8; /* checksum for uid */
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+ /* BYTES 1-8 */
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+ u64 uid;
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+ /* BYTES 9-12 */
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+ u32 data_crc32; /* checksum for data_len bytes starting at byte 13 */
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+ /* BYTE 13 */
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+ u8 device_rom_revision; /* should be <= 1 */
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+ u16 data_len:10;
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+ u8 __unknown1:6;
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+ /* BYTES 16-21 */
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+ u16 vendor_id;
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+ u16 model_id;
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+ u8 model_rev;
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+ u8 eeprom_rev;
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+} __packed;
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+
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+enum tb_drom_entry_type {
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+ TB_DROM_ENTRY_GENERIC,
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+ TB_DROM_ENTRY_PORT,
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+};
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+
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+struct tb_drom_entry_header {
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+ u8 len;
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+ u8 index:6;
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+ bool port_disabled:1; /* only valid if type is TB_DROM_ENTRY_PORT */
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+ enum tb_drom_entry_type type:1;
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+} __packed;
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+
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+struct tb_drom_entry_port {
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+ /* BYTES 0-1 */
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+ struct tb_drom_entry_header header;
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+ /* BYTE 2 */
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+ u8 dual_link_port_rid:4;
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+ u8 link_nr:1;
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+ u8 unknown1:2;
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+ bool has_dual_link_port:1;
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+
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+ /* BYTE 3 */
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+ u8 dual_link_port_nr:6;
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+ u8 unknown2:2;
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+
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+ /* BYTES 4 - 5 TODO decode */
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+ u8 micro2:4;
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+ u8 micro1:4;
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+ u8 micro3;
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+
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+ /* BYTES 5-6, TODO: verify (find hardware that has these set) */
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+ u8 peer_port_rid:4;
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+ u8 unknown3:3;
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+ bool has_peer_port:1;
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+ u8 peer_port_nr:6;
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+ u8 unknown4:2;
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+} __packed;
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+
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+
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+/**
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+ * tb_eeprom_get_drom_offset - get drom offset within eeprom
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+ */
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+int tb_eeprom_get_drom_offset(struct tb_switch *sw, u16 *offset)
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{
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- u8 data[9];
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struct tb_cap_plug_events cap;
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int res;
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if (!sw->cap_plug_events) {
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@@ -165,6 +243,7 @@ int tb_eeprom_read_uid(struct tb_switch *sw, u64 *uid)
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sizeof(cap) / 4);
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if (res)
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return res;
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+
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if (!cap.eeprom_ctl.present || cap.eeprom_ctl.not_present) {
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tb_sw_warn(sw, "no NVM\n");
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return -ENOSYS;
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@@ -175,15 +254,194 @@ int tb_eeprom_read_uid(struct tb_switch *sw, u64 *uid)
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cap.drom_offset);
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return -ENXIO;
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}
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+ *offset = cap.drom_offset;
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+ return 0;
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+}
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+
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+/**
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+ * tb_drom_read_uid_only - read uid directly from drom
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+ *
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+ * Does not use the cached copy in sw->drom. Used during resume to check switch
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+ * identity.
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+ */
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+int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid)
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+{
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+ u8 data[9];
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+ u16 drom_offset;
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+ u8 crc;
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+ int res = tb_eeprom_get_drom_offset(sw, &drom_offset);
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+ if (res)
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+ return res;
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/* read uid */
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- res = tb_eeprom_read_n(sw, cap.drom_offset, data, 9);
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+ res = tb_eeprom_read_n(sw, drom_offset, data, 9);
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if (res)
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return res;
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- /* TODO: check checksum in data[0] */
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+
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+ crc = tb_crc8(data + 1, 8);
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+ if (crc != data[0]) {
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+ tb_sw_warn(sw, "uid crc8 missmatch (expected: %#x, got: %#x)\n",
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+ data[0], crc);
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+ return -EIO;
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+ }
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+
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*uid = *(u64 *)(data+1);
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return 0;
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}
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+static void tb_drom_parse_port_entry(struct tb_port *port,
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+ struct tb_drom_entry_port *entry)
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+{
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+ port->link_nr = entry->link_nr;
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+ if (entry->has_dual_link_port)
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+ port->dual_link_port =
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+ &port->sw->ports[entry->dual_link_port_nr];
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+}
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+
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+static int tb_drom_parse_entry(struct tb_switch *sw,
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+ struct tb_drom_entry_header *header)
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+{
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+ struct tb_port *port;
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+ int res;
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+ enum tb_port_type type;
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+ if (header->type != TB_DROM_ENTRY_PORT)
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+ return 0;
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+ port = &sw->ports[header->index];
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+ port->disabled = header->port_disabled;
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+ if (port->disabled)
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+ return 0;
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+
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+ res = tb_port_read(port, &type, TB_CFG_PORT, 2, 1);
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+ if (res)
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+ return res;
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+ type &= 0xffffff;
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+
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+ if (type == TB_TYPE_PORT) {
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+ struct tb_drom_entry_port *entry = (void *) header;
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+ if (header->len != sizeof(*entry)) {
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+ tb_sw_warn(sw,
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+ "port entry has size %#x (expected %#lx)\n",
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+ header->len, sizeof(struct tb_drom_entry_port));
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+ return -EIO;
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+ }
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+ tb_drom_parse_port_entry(port, entry);
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+ }
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+ return 0;
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+}
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+
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+/**
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+ * tb_drom_parse_entries - parse the linked list of drom entries
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+ *
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+ * Drom must have been copied to sw->drom.
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+ */
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+static int tb_drom_parse_entries(struct tb_switch *sw)
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+{
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+ struct tb_drom_header *header = (void *) sw->drom;
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+ u16 pos = sizeof(*header);
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+ u16 drom_size = header->data_len + TB_DROM_DATA_START;
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+
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+ while (pos < drom_size) {
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+ struct tb_drom_entry_header *entry = (void *) (sw->drom + pos);
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+ if (pos + 1 == drom_size || pos + entry->len > drom_size
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+ || !entry->len) {
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+ tb_sw_warn(sw, "drom buffer overrun, aborting\n");
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+ return -EIO;
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+ }
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+
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+ tb_drom_parse_entry(sw, entry);
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+
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+ pos += entry->len;
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+ }
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+ return 0;
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+}
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+
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+/**
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+ * tb_drom_read - copy drom to sw->drom and parse it
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+ */
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+int tb_drom_read(struct tb_switch *sw)
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+{
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+ u16 drom_offset;
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+ u16 size;
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+ u32 crc;
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+ struct tb_drom_header *header;
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+ int res;
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+ if (sw->drom)
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+ return 0;
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+
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+ if (tb_route(sw) == 0) {
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+ /*
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+ * The root switch contains only a dummy drom (header only,
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+ * no entries). Hardcode the configuration here.
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+ */
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+ tb_drom_read_uid_only(sw, &sw->uid);
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+
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+ sw->ports[1].link_nr = 0;
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+ sw->ports[2].link_nr = 1;
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+ sw->ports[1].dual_link_port = &sw->ports[2];
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+ sw->ports[2].dual_link_port = &sw->ports[1];
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+
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+ sw->ports[3].link_nr = 0;
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+ sw->ports[4].link_nr = 1;
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+ sw->ports[3].dual_link_port = &sw->ports[4];
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+ sw->ports[4].dual_link_port = &sw->ports[3];
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+ return 0;
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+ }
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+
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+ res = tb_eeprom_get_drom_offset(sw, &drom_offset);
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+ if (res)
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+ return res;
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+
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+ res = tb_eeprom_read_n(sw, drom_offset + 14, (u8 *) &size, 2);
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+ if (res)
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+ return res;
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+ size &= 0x3ff;
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+ size += TB_DROM_DATA_START;
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+ tb_sw_info(sw, "reading drom (length: %#x)\n", size);
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+ if (size < sizeof(*header)) {
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+ tb_sw_warn(sw, "drom too small, aborting\n");
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+ return -EIO;
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+ }
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+
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+ sw->drom = kzalloc(size, GFP_KERNEL);
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+ if (!sw->drom)
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+ return -ENOMEM;
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+ res = tb_eeprom_read_n(sw, drom_offset, sw->drom, size);
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+ if (res)
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+ goto err;
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+
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+ header = (void *) sw->drom;
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+
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+ if (header->data_len + TB_DROM_DATA_START != size) {
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+ tb_sw_warn(sw, "drom size mismatch, aborting\n");
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+ goto err;
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+ }
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+
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+ crc = tb_crc8((u8 *) &header->uid, 8);
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+ if (crc != header->uid_crc8) {
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+ tb_sw_warn(sw,
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+ "drom uid crc8 mismatch (expected: %#x, got: %#x), aborting\n",
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+ header->uid_crc8, crc);
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+ goto err;
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+ }
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+ sw->uid = header->uid;
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+
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+ crc = tb_crc32(sw->drom + TB_DROM_DATA_START, header->data_len);
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+ if (crc != header->data_crc32) {
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+ tb_sw_warn(sw,
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+ "drom data crc32 mismatch (expected: %#x, got: %#x), aborting\n",
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+ header->data_crc32, crc);
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+ goto err;
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+ }
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+
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+ if (header->device_rom_revision > 1)
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+ tb_sw_warn(sw, "drom device_rom_revision %#x unknown\n",
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+ header->device_rom_revision);
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+
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+ return tb_drom_parse_entries(sw);
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+err:
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+ kfree(sw->drom);
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+ return -EIO;
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+
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+}
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diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
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index c2a24b6..9dfb8e1 100644
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--- a/drivers/thunderbolt/switch.c
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+++ b/drivers/thunderbolt/switch.c
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@@ -400,7 +400,7 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
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}
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sw->cap_plug_events = cap;
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- if (tb_eeprom_read_uid(sw, &sw->uid))
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+ if (tb_drom_read_uid_only(sw, &sw->uid))
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tb_sw_warn(sw, "could not read uid from eeprom\n");
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else
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tb_sw_info(sw, "uid: %#llx\n", sw->uid);
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@@ -442,7 +442,7 @@ int tb_switch_resume(struct tb_switch *sw)
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u64 uid;
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tb_sw_info(sw, "resuming switch\n");
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- err = tb_eeprom_read_uid(sw, &uid);
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+ err = tb_drom_read_uid_only(sw, &uid);
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if (err) {
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tb_sw_warn(sw, "uid read failed\n");
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return err;
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diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
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index 63e89d0..18ade5e 100644
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--- a/drivers/thunderbolt/tb.h
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+++ b/drivers/thunderbolt/tb.h
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@@ -22,6 +22,7 @@ struct tb_switch {
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u64 uid;
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int cap_plug_events; /* offset, zero if not found */
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bool is_unplugged; /* unplugged, will go away */
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+ u8 *drom;
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};
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/**
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@@ -33,6 +34,9 @@ struct tb_port {
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struct tb_port *remote; /* remote port, NULL if not connected */
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int cap_phy; /* offset, zero if not found */
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u8 port; /* port number on switch */
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+ bool disabled; /* disabled by eeprom */
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+ struct tb_port *dual_link_port;
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+ u8 link_nr:1;
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};
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/**
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@@ -237,7 +241,8 @@ int tb_path_activate(struct tb_path *path);
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void tb_path_deactivate(struct tb_path *path);
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bool tb_path_is_invalid(struct tb_path *path);
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-int tb_eeprom_read_uid(struct tb_switch *sw, u64 *uid);
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+int tb_drom_read(struct tb_switch *sw);
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+int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
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static inline int tb_route_length(u64 route)
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