thunderbolt: Add support for ASMedia NVM image format

Add support for ASMedia specific NVM image format. This makes it
possible to upgrade the NVM firmware of ASMedia routers in addition to
Intel ones.
Signed-off-by: Szuying Chen <Chloe_Chen@asmedia.com.tw>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/thunderbolt/nvm.c

@@ -18,6 +18,10 @@
 #define INTEL_NVM_CSS			0x10
 #define INTEL_NVM_FLASH_SIZE		0x45
 
+/* ASMedia specific NVM offsets */
+#define ASMEDIA_NVM_DATE		0x1c
+#define ASMEDIA_NVM_VERSION		0x28
+
 static DEFINE_IDA(nvm_ida);
 
 /**
@@ -149,8 +153,41 @@ static const struct tb_nvm_vendor_ops intel_switch_nvm_ops = {
 	.write_headers = intel_switch_nvm_write_headers,
 };
 
+static int asmedia_switch_nvm_version(struct tb_nvm *nvm)
+{
+	struct tb_switch *sw = tb_to_switch(nvm->dev);
+	u32 val;
+	int ret;
+
+	ret = tb_switch_nvm_read(sw, ASMEDIA_NVM_VERSION, &val, sizeof(val));
+	if (ret)
+		return ret;
+
+	nvm->major = (val << 16) & 0xff0000;
+	nvm->major |= val & 0x00ff00;
+	nvm->major |= (val >> 16) & 0x0000ff;
+
+	ret = tb_switch_nvm_read(sw, ASMEDIA_NVM_DATE, &val, sizeof(val));
+	if (ret)
+		return ret;
+
+	nvm->minor = (val << 16) & 0xff0000;
+	nvm->minor |= val & 0x00ff00;
+	nvm->minor |= (val >> 16) & 0x0000ff;
+
+	/* ASMedia NVM size is fixed to 512k */
+	nvm->active_size = SZ_512K;
+
+	return 0;
+}
+
+static const struct tb_nvm_vendor_ops asmedia_switch_nvm_ops = {
+	.read_version = asmedia_switch_nvm_version,
+};
+
 /* Router vendor NVM support table */
 static const struct tb_nvm_vendor switch_nvm_vendors[] = {
+	{ 0x174c, &asmedia_switch_nvm_ops },
 	{ PCI_VENDOR_ID_INTEL, &intel_switch_nvm_ops },
 	{ 0x8087, &intel_switch_nvm_ops },
 };