Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 712 insertions, 0 deletions

diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c
new file mode 100644
index 000000000..eb241b270
--- /dev/null
+++ b/drivers/thunderbolt/eeprom.c
@@ -0,0 +1,712 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Thunderbolt driver - eeprom access
+ *
+ * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
+ * Copyright (C) 2018, Intel Corporation
+ */
+
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+#include "tb.h"
+
+/*
+ * tb_eeprom_ctl_write() - write control word
+ */
+static int tb_eeprom_ctl_write(struct tb_switch *sw, struct tb_eeprom_ctl *ctl)
+{
+	return tb_sw_write(sw, ctl, TB_CFG_SWITCH, sw->cap_plug_events + ROUTER_CS_4, 1);
+}
+
+/*
+ * tb_eeprom_ctl_write() - read control word
+ */
+static int tb_eeprom_ctl_read(struct tb_switch *sw, struct tb_eeprom_ctl *ctl)
+{
+	return tb_sw_read(sw, ctl, TB_CFG_SWITCH, sw->cap_plug_events + ROUTER_CS_4, 1);
+}
+
+enum tb_eeprom_transfer {
+	TB_EEPROM_IN,
+	TB_EEPROM_OUT,
+};
+
+/*
+ * tb_eeprom_active - enable rom access
+ *
+ * WARNING: Always disable access after usage. Otherwise the controller will
+ * fail to reprobe.
+ */
+static int tb_eeprom_active(struct tb_switch *sw, bool enable)
+{
+	struct tb_eeprom_ctl ctl;
+	int res = tb_eeprom_ctl_read(sw, &ctl);
+	if (res)
+		return res;
+	if (enable) {
+		ctl.bit_banging_enable = 1;
+		res = tb_eeprom_ctl_write(sw, &ctl);
+		if (res)
+			return res;
+		ctl.fl_cs = 0;
+		return tb_eeprom_ctl_write(sw, &ctl);
+	} else {
+		ctl.fl_cs = 1;
+		res = tb_eeprom_ctl_write(sw, &ctl);
+		if (res)
+			return res;
+		ctl.bit_banging_enable = 0;
+		return tb_eeprom_ctl_write(sw, &ctl);
+	}
+}
+
+/*
+ * tb_eeprom_transfer - transfer one bit
+ *
+ * If TB_EEPROM_IN is passed, then the bit can be retrieved from ctl->fl_do.
+ * If TB_EEPROM_OUT is passed, then ctl->fl_di will be written.
+ */
+static int tb_eeprom_transfer(struct tb_switch *sw, struct tb_eeprom_ctl *ctl,
+			      enum tb_eeprom_transfer direction)
+{
+	int res;
+	if (direction == TB_EEPROM_OUT) {
+		res = tb_eeprom_ctl_write(sw, ctl);
+		if (res)
+			return res;
+	}
+	ctl->fl_sk = 1;
+	res = tb_eeprom_ctl_write(sw, ctl);
+	if (res)
+		return res;
+	if (direction == TB_EEPROM_IN) {
+		res = tb_eeprom_ctl_read(sw, ctl);
+		if (res)
+			return res;
+	}
+	ctl->fl_sk = 0;
+	return tb_eeprom_ctl_write(sw, ctl);
+}
+
+/*
+ * tb_eeprom_out - write one byte to the bus
+ */
+static int tb_eeprom_out(struct tb_switch *sw, u8 val)
+{
+	struct tb_eeprom_ctl ctl;
+	int i;
+	int res = tb_eeprom_ctl_read(sw, &ctl);
+	if (res)
+		return res;
+	for (i = 0; i < 8; i++) {
+		ctl.fl_di = val & 0x80;
+		res = tb_eeprom_transfer(sw, &ctl, TB_EEPROM_OUT);
+		if (res)
+			return res;
+		val <<= 1;
+	}
+	return 0;
+}
+
+/*
+ * tb_eeprom_in - read one byte from the bus
+ */
+static int tb_eeprom_in(struct tb_switch *sw, u8 *val)
+{
+	struct tb_eeprom_ctl ctl;
+	int i;
+	int res = tb_eeprom_ctl_read(sw, &ctl);
+	if (res)
+		return res;
+	*val = 0;
+	for (i = 0; i < 8; i++) {
+		*val <<= 1;
+		res = tb_eeprom_transfer(sw, &ctl, TB_EEPROM_IN);
+		if (res)
+			return res;
+		*val |= ctl.fl_do;
+	}
+	return 0;
+}
+
+/*
+ * tb_eeprom_get_drom_offset - get drom offset within eeprom
+ */
+static int tb_eeprom_get_drom_offset(struct tb_switch *sw, u16 *offset)
+{
+	struct tb_cap_plug_events cap;
+	int res;
+
+	if (!sw->cap_plug_events) {
+		tb_sw_warn(sw, "no TB_CAP_PLUG_EVENTS, cannot read eeprom\n");
+		return -ENODEV;
+	}
+	res = tb_sw_read(sw, &cap, TB_CFG_SWITCH, sw->cap_plug_events,
+			     sizeof(cap) / 4);
+	if (res)
+		return res;
+
+	if (!cap.eeprom_ctl.present || cap.eeprom_ctl.not_present) {
+		tb_sw_warn(sw, "no NVM\n");
+		return -ENODEV;
+	}
+
+	if (cap.drom_offset > 0xffff) {
+		tb_sw_warn(sw, "drom offset is larger than 0xffff: %#x\n",
+				cap.drom_offset);
+		return -ENXIO;
+	}
+	*offset = cap.drom_offset;
+	return 0;
+}
+
+/*
+ * tb_eeprom_read_n - read count bytes from offset into val
+ */
+static int tb_eeprom_read_n(struct tb_switch *sw, u16 offset, u8 *val,
+		size_t count)
+{
+	u16 drom_offset;
+	int i, res;
+
+	res = tb_eeprom_get_drom_offset(sw, &drom_offset);
+	if (res)
+		return res;
+
+	offset += drom_offset;
+
+	res = tb_eeprom_active(sw, true);
+	if (res)
+		return res;
+	res = tb_eeprom_out(sw, 3);
+	if (res)
+		return res;
+	res = tb_eeprom_out(sw, offset >> 8);
+	if (res)
+		return res;
+	res = tb_eeprom_out(sw, offset);
+	if (res)
+		return res;
+	for (i = 0; i < count; i++) {
+		res = tb_eeprom_in(sw, val + i);
+		if (res)
+			return res;
+	}
+	return tb_eeprom_active(sw, false);
+}
+
+static u8 tb_crc8(u8 *data, int len)
+{
+	int i, j;
+	u8 val = 0xff;
+	for (i = 0; i < len; i++) {
+		val ^= data[i];
+		for (j = 0; j < 8; j++)
+			val = (val << 1) ^ ((val & 0x80) ? 7 : 0);
+	}
+	return val;
+}
+
+static u32 tb_crc32(void *data, size_t len)
+{
+	return ~__crc32c_le(~0, data, len);
+}
+
+#define TB_DROM_DATA_START		13
+#define TB_DROM_HEADER_SIZE		22
+#define USB4_DROM_HEADER_SIZE		16
+
+struct tb_drom_header {
+	/* BYTE 0 */
+	u8 uid_crc8; /* checksum for uid */
+	/* BYTES 1-8 */
+	u64 uid;
+	/* BYTES 9-12 */
+	u32 data_crc32; /* checksum for data_len bytes starting at byte 13 */
+	/* BYTE 13 */
+	u8 device_rom_revision; /* should be <= 1 */
+	u16 data_len:12;
+	u8 reserved:4;
+	/* BYTES 16-21 - Only for TBT DROM, nonexistent in USB4 DROM */
+	u16 vendor_id;
+	u16 model_id;
+	u8 model_rev;
+	u8 eeprom_rev;
+} __packed;
+
+enum tb_drom_entry_type {
+	/* force unsigned to prevent "one-bit signed bitfield" warning */
+	TB_DROM_ENTRY_GENERIC = 0U,
+	TB_DROM_ENTRY_PORT,
+};
+
+struct tb_drom_entry_header {
+	u8 len;
+	u8 index:6;
+	bool port_disabled:1; /* only valid if type is TB_DROM_ENTRY_PORT */
+	enum tb_drom_entry_type type:1;
+} __packed;
+
+struct tb_drom_entry_generic {
+	struct tb_drom_entry_header header;
+	u8 data[];
+} __packed;
+
+struct tb_drom_entry_port {
+	/* BYTES 0-1 */
+	struct tb_drom_entry_header header;
+	/* BYTE 2 */
+	u8 dual_link_port_rid:4;
+	u8 link_nr:1;
+	u8 unknown1:2;
+	bool has_dual_link_port:1;
+
+	/* BYTE 3 */
+	u8 dual_link_port_nr:6;
+	u8 unknown2:2;
+
+	/* BYTES 4 - 5 TODO decode */
+	u8 micro2:4;
+	u8 micro1:4;
+	u8 micro3;
+
+	/* BYTES 6-7, TODO: verify (find hardware that has these set) */
+	u8 peer_port_rid:4;
+	u8 unknown3:3;
+	bool has_peer_port:1;
+	u8 peer_port_nr:6;
+	u8 unknown4:2;
+} __packed;
+
+/* USB4 product descriptor */
+struct tb_drom_entry_desc {
+	struct tb_drom_entry_header header;
+	u16 bcdUSBSpec;
+	u16 idVendor;
+	u16 idProduct;
+	u16 bcdProductFWRevision;
+	u32 TID;
+	u8 productHWRevision;
+};
+
+/**
+ * tb_drom_read_uid_only() - Read UID directly from DROM
+ * @sw: Router whose UID to read
+ * @uid: UID is placed here
+ *
+ * Does not use the cached copy in sw->drom. Used during resume to check switch
+ * identity.
+ */
+int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid)
+{
+	u8 data[9];
+	u8 crc;
+	int res;
+
+	/* read uid */
+	res = tb_eeprom_read_n(sw, 0, data, 9);
+	if (res)
+		return res;
+
+	crc = tb_crc8(data + 1, 8);
+	if (crc != data[0]) {
+		tb_sw_warn(sw, "uid crc8 mismatch (expected: %#x, got: %#x)\n",
+				data[0], crc);
+		return -EIO;
+	}
+
+	*uid = *(u64 *)(data+1);
+	return 0;
+}
+
+static int tb_drom_parse_entry_generic(struct tb_switch *sw,
+		struct tb_drom_entry_header *header)
+{
+	const struct tb_drom_entry_generic *entry =
+		(const struct tb_drom_entry_generic *)header;
+
+	switch (header->index) {
+	case 1:
+		/* Length includes 2 bytes header so remove it before copy */
+		sw->vendor_name = kstrndup(entry->data,
+			header->len - sizeof(*header), GFP_KERNEL);
+		if (!sw->vendor_name)
+			return -ENOMEM;
+		break;
+
+	case 2:
+		sw->device_name = kstrndup(entry->data,
+			header->len - sizeof(*header), GFP_KERNEL);
+		if (!sw->device_name)
+			return -ENOMEM;
+		break;
+	case 9: {
+		const struct tb_drom_entry_desc *desc =
+			(const struct tb_drom_entry_desc *)entry;
+
+		if (!sw->vendor && !sw->device) {
+			sw->vendor = desc->idVendor;
+			sw->device = desc->idProduct;
+		}
+		break;
+	}
+	}
+
+	return 0;
+}
+
+static int tb_drom_parse_entry_port(struct tb_switch *sw,
+				    struct tb_drom_entry_header *header)
+{
+	struct tb_port *port;
+	int res;
+	enum tb_port_type type;
+
+	/*
+	 * Some DROMs list more ports than the controller actually has
+	 * so we skip those but allow the parser to continue.
+	 */
+	if (header->index > sw->config.max_port_number) {
+		dev_info_once(&sw->dev, "ignoring unnecessary extra entries in DROM\n");
+		return 0;
+	}
+
+	port = &sw->ports[header->index];
+	port->disabled = header->port_disabled;
+	if (port->disabled)
+		return 0;
+
+	res = tb_port_read(port, &type, TB_CFG_PORT, 2, 1);
+	if (res)
+		return res;
+	type &= 0xffffff;
+
+	if (type == TB_TYPE_PORT) {
+		struct tb_drom_entry_port *entry = (void *) header;
+		if (header->len != sizeof(*entry)) {
+			tb_sw_warn(sw,
+				"port entry has size %#x (expected %#zx)\n",
+				header->len, sizeof(struct tb_drom_entry_port));
+			return -EIO;
+		}
+		port->link_nr = entry->link_nr;
+		if (entry->has_dual_link_port)
+			port->dual_link_port =
+				&port->sw->ports[entry->dual_link_port_nr];
+	}
+	return 0;
+}
+
+/*
+ * tb_drom_parse_entries - parse the linked list of drom entries
+ *
+ * Drom must have been copied to sw->drom.
+ */
+static int tb_drom_parse_entries(struct tb_switch *sw, size_t header_size)
+{
+	struct tb_drom_header *header = (void *) sw->drom;
+	u16 pos = header_size;
+	u16 drom_size = header->data_len + TB_DROM_DATA_START;
+	int res;
+
+	while (pos < drom_size) {
+		struct tb_drom_entry_header *entry = (void *) (sw->drom + pos);
+		if (pos + 1 == drom_size || pos + entry->len > drom_size
+				|| !entry->len) {
+			tb_sw_warn(sw, "DROM buffer overrun\n");
+			return -EIO;
+		}
+
+		switch (entry->type) {
+		case TB_DROM_ENTRY_GENERIC:
+			res = tb_drom_parse_entry_generic(sw, entry);
+			break;
+		case TB_DROM_ENTRY_PORT:
+			res = tb_drom_parse_entry_port(sw, entry);
+			break;
+		}
+		if (res)
+			return res;
+
+		pos += entry->len;
+	}
+	return 0;
+}
+
+/*
+ * tb_drom_copy_efi - copy drom supplied by EFI to sw->drom if present
+ */
+static int tb_drom_copy_efi(struct tb_switch *sw, u16 *size)
+{
+	struct device *dev = &sw->tb->nhi->pdev->dev;
+	int len, res;
+
+	len = device_property_count_u8(dev, "ThunderboltDROM");
+	if (len < 0 || len < sizeof(struct tb_drom_header))
+		return -EINVAL;
+
+	sw->drom = kmalloc(len, GFP_KERNEL);
+	if (!sw->drom)
+		return -ENOMEM;
+
+	res = device_property_read_u8_array(dev, "ThunderboltDROM", sw->drom,
+									len);
+	if (res)
+		goto err;
+
+	*size = ((struct tb_drom_header *)sw->drom)->data_len +
+							  TB_DROM_DATA_START;
+	if (*size > len)
+		goto err;
+
+	return 0;
+
+err:
+	kfree(sw->drom);
+	sw->drom = NULL;
+	return -EINVAL;
+}
+
+static int tb_drom_copy_nvm(struct tb_switch *sw, u16 *size)
+{
+	u16 drom_offset;
+	int ret;
+
+	if (!sw->dma_port)
+		return -ENODEV;
+
+	ret = tb_eeprom_get_drom_offset(sw, &drom_offset);
+	if (ret)
+		return ret;
+
+	if (!drom_offset)
+		return -ENODEV;
+
+	ret = dma_port_flash_read(sw->dma_port, drom_offset + 14, size,
+				  sizeof(*size));
+	if (ret)
+		return ret;
+
+	/* Size includes CRC8 + UID + CRC32 */
+	*size += 1 + 8 + 4;
+	sw->drom = kzalloc(*size, GFP_KERNEL);
+	if (!sw->drom)
+		return -ENOMEM;
+
+	ret = dma_port_flash_read(sw->dma_port, drom_offset, sw->drom, *size);
+	if (ret)
+		goto err_free;
+
+	/*
+	 * Read UID from the minimal DROM because the one in NVM is just
+	 * a placeholder.
+	 */
+	tb_drom_read_uid_only(sw, &sw->uid);
+	return 0;
+
+err_free:
+	kfree(sw->drom);
+	sw->drom = NULL;
+	return ret;
+}
+
+static int usb4_copy_drom(struct tb_switch *sw, u16 *size)
+{
+	int ret;
+
+	ret = usb4_switch_drom_read(sw, 14, size, sizeof(*size));
+	if (ret)
+		return ret;
+
+	/* Size includes CRC8 + UID + CRC32 */
+	*size += 1 + 8 + 4;
+	sw->drom = kzalloc(*size, GFP_KERNEL);
+	if (!sw->drom)
+		return -ENOMEM;
+
+	ret = usb4_switch_drom_read(sw, 0, sw->drom, *size);
+	if (ret) {
+		kfree(sw->drom);
+		sw->drom = NULL;
+	}
+
+	return ret;
+}
+
+static int tb_drom_bit_bang(struct tb_switch *sw, u16 *size)
+{
+	int ret;
+
+	ret = tb_eeprom_read_n(sw, 14, (u8 *)size, 2);
+	if (ret)
+		return ret;
+
+	*size &= 0x3ff;
+	*size += TB_DROM_DATA_START;
+
+	tb_sw_dbg(sw, "reading DROM (length: %#x)\n", *size);
+	if (*size < sizeof(struct tb_drom_header)) {
+		tb_sw_warn(sw, "DROM too small, aborting\n");
+		return -EIO;
+	}
+
+	sw->drom = kzalloc(*size, GFP_KERNEL);
+	if (!sw->drom)
+		return -ENOMEM;
+
+	ret = tb_eeprom_read_n(sw, 0, sw->drom, *size);
+	if (ret)
+		goto err;
+
+	return 0;
+
+err:
+	kfree(sw->drom);
+	sw->drom = NULL;
+	return ret;
+}
+
+static int tb_drom_parse_v1(struct tb_switch *sw)
+{
+	const struct tb_drom_header *header =
+		(const struct tb_drom_header *)sw->drom;
+	u32 crc;
+
+	crc = tb_crc8((u8 *) &header->uid, 8);
+	if (crc != header->uid_crc8) {
+		tb_sw_warn(sw,
+			"DROM UID CRC8 mismatch (expected: %#x, got: %#x)\n",
+			header->uid_crc8, crc);
+		return -EIO;
+	}
+	if (!sw->uid)
+		sw->uid = header->uid;
+	sw->vendor = header->vendor_id;
+	sw->device = header->model_id;
+
+	crc = tb_crc32(sw->drom + TB_DROM_DATA_START, header->data_len);
+	if (crc != header->data_crc32) {
+		tb_sw_warn(sw,
+			"DROM data CRC32 mismatch (expected: %#x, got: %#x), continuing\n",
+			header->data_crc32, crc);
+	}
+
+	return tb_drom_parse_entries(sw, TB_DROM_HEADER_SIZE);
+}
+
+static int usb4_drom_parse(struct tb_switch *sw)
+{
+	const struct tb_drom_header *header =
+		(const struct tb_drom_header *)sw->drom;
+	u32 crc;
+
+	crc = tb_crc32(sw->drom + TB_DROM_DATA_START, header->data_len);
+	if (crc != header->data_crc32) {
+		tb_sw_warn(sw,
+			   "DROM data CRC32 mismatch (expected: %#x, got: %#x), continuing\n",
+			   header->data_crc32, crc);
+	}
+
+	return tb_drom_parse_entries(sw, USB4_DROM_HEADER_SIZE);
+}
+
+static int tb_drom_parse(struct tb_switch *sw, u16 size)
+{
+	const struct tb_drom_header *header = (const void *)sw->drom;
+	int ret;
+
+	if (header->data_len + TB_DROM_DATA_START != size) {
+		tb_sw_warn(sw, "DROM size mismatch\n");
+		ret = -EIO;
+		goto err;
+	}
+
+	tb_sw_dbg(sw, "DROM version: %d\n", header->device_rom_revision);
+
+	switch (header->device_rom_revision) {
+	case 3:
+		ret = usb4_drom_parse(sw);
+		break;
+	default:
+		tb_sw_warn(sw, "DROM device_rom_revision %#x unknown\n",
+			   header->device_rom_revision);
+		fallthrough;
+	case 1:
+		ret = tb_drom_parse_v1(sw);
+		break;
+	}
+
+	if (ret) {
+		tb_sw_warn(sw, "parsing DROM failed\n");
+		goto err;
+	}
+
+	return 0;
+
+err:
+	kfree(sw->drom);
+	sw->drom = NULL;
+
+	return ret;
+}
+
+static int tb_drom_host_read(struct tb_switch *sw)
+{
+	u16 size;
+
+	if (tb_switch_is_usb4(sw)) {
+		usb4_switch_read_uid(sw, &sw->uid);
+		if (!usb4_copy_drom(sw, &size))
+			return tb_drom_parse(sw, size);
+	} else {
+		if (!tb_drom_copy_efi(sw, &size))
+			return tb_drom_parse(sw, size);
+
+		if (!tb_drom_copy_nvm(sw, &size))
+			return tb_drom_parse(sw, size);
+
+		tb_drom_read_uid_only(sw, &sw->uid);
+	}
+
+	return 0;
+}
+
+static int tb_drom_device_read(struct tb_switch *sw)
+{
+	u16 size;
+	int ret;
+
+	if (tb_switch_is_usb4(sw)) {
+		usb4_switch_read_uid(sw, &sw->uid);
+		ret = usb4_copy_drom(sw, &size);
+	} else {
+		ret = tb_drom_bit_bang(sw, &size);
+	}
+
+	if (ret)
+		return ret;
+
+	return tb_drom_parse(sw, size);
+}
+
+/**
+ * tb_drom_read() - Copy DROM to sw->drom and parse it
+ * @sw: Router whose DROM to read and parse
+ *
+ * This function reads router DROM and if successful parses the entries and
+ * populates the fields in @sw accordingly. Can be called for any router
+ * generation.
+ *
+ * Returns %0 in case of success and negative errno otherwise.
+ */
+int tb_drom_read(struct tb_switch *sw)
+{
+	if (sw->drom)
+		return 0;
+
+	if (!tb_route(sw))
+		return tb_drom_host_read(sw);
+	return tb_drom_device_read(sw);
+}