linux-kernel - [PATCH v7 3/3] thunderbolt: To extend ASMedia NVM formats.

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Date:   Mon, 29 Aug 2022 19:10:59 +0800
From:   Szuying Chen <chensiying21@...il.com>
To:     gregkh@...uxfoundation.org, mario.limonciello@....com,
        mika.westerberg@...ux.intel.com, andreas.noever@...il.com,
        michael.jamet@...el.com, YehezkelShB@...il.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yd_Tseng@...edia.com.tw, Chloe_Chen@...edia.com.tw,
        Richard_Hsu@...edia.com.tw
Subject: [PATCH v7 3/3] thunderbolt: To extend ASMedia NVM formats.

From: Szuying Chen <Chloe_Chen@...edia.com.tw>

The patch add ASMedia NVM formats. And add tb_switch_nvm_upgradeable()
to enable firmware upgrade.

Signed-off-by: Szuying Chen <Chloe_Chen@...edia.com.tw>
---
Add ASMedia NVM formats. And fix asmedia_nvm_version() part of code so
that easier to read.

 drivers/thunderbolt/nvm.c    | 68 ++++++++++++++++++++++++++++++++++++
 drivers/thunderbolt/switch.c |  3 ++
 drivers/thunderbolt/tb.h     |  1 +
 3 files changed, 72 insertions(+)

diff --git a/drivers/thunderbolt/nvm.c b/drivers/thunderbolt/nvm.c
index 91c8848b4d2e..c69db5b65f7d 100644
--- a/drivers/thunderbolt/nvm.c
+++ b/drivers/thunderbolt/nvm.c
@@ -15,16 +15,25 @@
 /* Switch NVM support */
 #define NVM_CSS		0x10

+/* Vendor ID of the Router. It's assigned by the USB-IF */
+#define ROUTER_VENDOR_ID_ASMEDIA 0x174c
+
+/* ASMedia specific NVM offsets */
+#define ASMEDIA_NVM_DATE	0x1c
+#define ASMEDIA_NVM_VERSION	0x28
+
 static DEFINE_IDA(nvm_ida);

 /**
  * struct tb_nvm_vendor_ops - Vendor NVM specific operations
  * @read_version: Used NVM read get Firmware version.
  * @validate: Vendors have their validate method before NVM write.
+ * @nvm_upgrade: Enable NVM upgrade.
  */
 struct tb_nvm_vendor_ops {
 	int (*read_version)(struct tb_switch *sw);
 	int (*validate)(struct tb_switch *sw);
+	void (*nvm_upgrade)(struct tb_switch *sw);
 };

 static inline int nvm_read(struct tb_switch *sw, unsigned int address,
@@ -128,11 +137,49 @@ static int intel_nvm_validate(struct tb_switch *sw)
 	return 0;
 }

+static int asmedia_nvm_version(struct tb_switch *sw)
+{
+	struct tb_nvm *nvm = sw->nvm;
+	u32 val;
+	int ret;
+
+	/* ASMedia get version and date format is xxxxxx.xxxxxx */
+	ret = nvm_read(sw, ASMEDIA_NVM_VERSION, &val, sizeof(val));
+	if (ret)
+		return ret;
+
+	nvm->major = (((u8)val) << 0x10 | ((u8)(val >> 0x8)) << 0x8 | (u8)(val >> 0x10));
+
+	ret = nvm_read(sw, ASMEDIA_NVM_DATE, &val, sizeof(val));
+	if (ret)
+		return ret;
+
+	nvm->minor = (((u8)val) << 0x10 | ((u8)(val >> 0x8)) << 0x8 | (u8)(val >> 0x10));
+
+	/*
+	 * Asmedia NVM size fixed on 512K. We currently have no plan
+	 * to increase size in the future.
+	 */
+	nvm->nvm_size = SZ_512K;
+
+	return 0;
+}
+
+static void tb_switch_set_nvm_upgrade(struct tb_switch *sw)
+{
+	sw->no_nvm_upgrade = false;
+}
+
 static const struct tb_nvm_vendor_ops intel_switch_nvm_ops = {
 	.read_version = intel_nvm_version,
 	.validate = intel_nvm_validate,
 };

+static const struct tb_nvm_vendor_ops asmedia_switch_nvm_ops = {
+	.nvm_upgrade = tb_switch_set_nvm_upgrade,
+	.read_version = asmedia_nvm_version,
+};
+
 struct switch_nvm_vendor {
 	u16 vendor;
 	const struct tb_nvm_vendor_ops *vops;
@@ -143,6 +190,27 @@ static const struct switch_nvm_vendor switch_nvm_vendors[] = {
 	{ 0x8087, &intel_switch_nvm_ops },
 };

+/**
+ * tb_switch_nvm_upgradeable() - Enable NVM upgrade of a switch
+ * @sw: Switch whose NVM upgrade to enable
+ *
+ * This function must be called before creating the switch devices, it will
+ * make the no_active NVM device visible.
+ */
+void tb_switch_nvm_upgradeable(struct tb_switch *sw)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(switch_nvm_vendors); i++) {
+		const struct switch_nvm_vendor *v = &switch_nvm_vendors[i];
+
+		if (v->vendor == sw->config.vendor_id) {
+			if (v->vops->nvm_upgrade)
+				v->vops->nvm_upgrade(sw);
+		}
+	}
+}
+
 /**
  * tb_switch_nvm_validate() - Validate NVM image
  * @switch: Switch to NVM write
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 2dbfd75202bf..f8dc18f6c5c8 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -2822,6 +2822,9 @@ int tb_switch_add(struct tb_switch *sw)
 			return ret;
 	}

+	/* Enable the NVM firmware upgrade */
+	tb_switch_nvm_upgradeable(sw);
+
 	ret = device_add(&sw->dev);
 	if (ret) {
 		dev_err(&sw->dev, "failed to add device: %d\n", ret);
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 9cf62d5f25d2..642af7473851 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -773,6 +773,7 @@ int tb_switch_reset(struct tb_switch *sw);
 int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
 			   u32 value, int timeout_msec);
 int tb_switch_nvm_validate(struct tb_switch *sw);
+void tb_switch_nvm_upgradeable(struct tb_switch *sw);
 void tb_sw_set_unplugged(struct tb_switch *sw);
 struct tb_port *tb_switch_find_port(struct tb_switch *sw,
				    enum tb_port_type type);
--
2.34.1