This will be needed to check if latest fw is already flashed.
Signed-off-by: Ajay Gupta <ajayg@xxxxxxxxxx>
---
drivers/usb/typec/ucsi/ucsi_ccg.c | 139 ++++++++++++++++++++++++++++++
1 file changed, 139 insertions(+)
diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c
index 5f341934a5af..6069a9f60d1e 100644
--- a/drivers/usb/typec/ucsi/ucsi_ccg.c
+++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
@@ -9,6 +9,7 @@
*/
#include <linux/acpi.h>
#include <linux/delay.h>
+#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pci.h>
@@ -17,6 +18,8 @@
#include <asm/unaligned.h>
#include "ucsi.h"
+static int secondary_fw_min_ver = 41;
+module_param(secondary_fw_min_ver, int, 0660);
#define CCGX_RAB_DEVICE_MODE 0x0000
#define CCGX_RAB_INTR_REG 0x0006
#define DEV_INT BIT(0)
@@ -68,6 +71,27 @@
#define FW2_METADATA_ROW 0x1FE
#define FW_CFG_TABLE_SIG_SIZE 256
+enum enum_fw_mode {
+ BOOT, /* bootloader */
+ FW1, /* FW partition-1 */
+ FW2, /* FW partition-2 */
+ FW_INVALID,
+};
+
+enum enum_flash_mode {
+ SECONDARY_BL, /* update secondary using bootloader */
+ SECONDARY, /* update secondary using primary */
+ PRIMARY, /* update primary */
+ FLASH_NOT_NEEDED, /* update not required */
+ FLASH_INVALID,
+};
+
+static const char * const ccg_fw_names[] = {
+ /* 0x00 */ "ccg_boot.cyacd",
+ /* 0x01 */ "ccg_2.cyacd",
+ /* 0x02 */ "ccg_1.cyacd",
+};
+
struct ccg_dev_info {
u8 fw_mode:2;
u8 two_pd_ports:2;
@@ -95,6 +119,20 @@ struct version_info {
struct version_format app;
};
+struct fw_config_table {
+ u32 identity;
+ u16 table_size;
+ u8 fwct_version;
+ u8 is_key_change;
+ u8 guid[16];
+ struct version_format base;
+ struct version_format app;
+ u8 primary_fw_digest[32];
+ u32 key_exp_length;
+ u8 key_modulus[256];
+ u8 key_exp[4];
+};
+
/* CCGx response codes */
enum ccg_resp_code {
CMD_NO_RESP = 0x00,
@@ -737,6 +775,107 @@ static int ccg_cmd_validate_fw(struct ucsi_ccg *uc, unsigned int fwid)
return 0;
}
+static bool ccg_check_fw_version(struct ucsi_ccg *uc, const char *fw_name,
+ struct version_format *app)
+{
+ const struct firmware *fw = NULL;
+ struct device *dev = uc->dev;
+ struct fw_config_table fw_cfg;
+ u32 cur_version, new_version;
+ bool is_later = false;
+
+ if (request_firmware(&fw, fw_name, dev) != 0) {
+ dev_err(dev, "error: Failed to open cyacd file %s\n", fw_name);
+ return false;
+ }
+
+ /*
+ * check if signed fw
+ * last part of fw image is fw cfg table and signature
+ */
+ if (fw->size < sizeof(fw_cfg) + FW_CFG_TABLE_SIG_SIZE)
+ goto not_signed_fw;
+
+ memcpy((uint8_t *)&fw_cfg, fw->data + fw->size -
+ sizeof(fw_cfg) - FW_CFG_TABLE_SIG_SIZE, sizeof(fw_cfg));
+
+ if (fw_cfg.identity != ('F' | ('W' << 8) | ('C' << 16) | ('T' << 24))) {
+ dev_info(dev, "not a signed image\n");
+ goto not_signed_fw;
+ }
+
+ /* compare input version with FWCT version */
+ cur_version = app->build | (app->patch << 16) |
+ ((app->min | (app->maj << 4)) << 24);
+
+ new_version = fw_cfg.app.build | (fw_cfg.app.patch << 16) |
+ ((fw_cfg.app.min | (fw_cfg.app.maj << 4)) << 24);
+
+ dev_dbg(dev, "compare current %08x and new version %08x\n",
+ cur_version, new_version);
+
+ if (new_version > cur_version) {
+ dev_dbg(dev, "new firmware file version is later\n");
+ is_later = true;
+ } else {
+ dev_dbg(dev, "new firmware file version is same or earlier\n");
+ }
+
+not_signed_fw:
+ release_firmware(fw);
+ return is_later;
+}
+
+static int ccg_fw_update_needed(struct ucsi_ccg *uc,
+ enum enum_flash_mode *mode)
+{
+ struct device *dev = uc->dev;
+ int err;
+ struct version_info version[3];
+
+ err = ccg_read(uc, CCGX_RAB_DEVICE_MODE, (u8 *)(&uc->info),
+ sizeof(uc->info));
+ if (err) {
+ dev_err(dev, "read device mode failed\n");
+ return err;
+ }
+
+ err = ccg_read(uc, CCGX_RAB_READ_ALL_VER, (u8 *)version,
+ sizeof(version));
+ if (err) {
+ dev_err(dev, "read device mode failed\n");
+ return err;
+ }
+
+ dev_dbg(dev, "check if fw upgrade required %x %x %x %x %x %x %x %x\n",
+ version[FW1].base.build, version[FW1].base.patch,
+ version[FW1].base.min, version[FW1].base.maj,
+ version[FW2].app.build, version[FW2].app.patch,
+ version[FW2].app.min, version[FW2].app.maj);
+
+ if (memcmp(&version[FW1], "\0\0\0\0\0\0\0\0",
+ sizeof(struct version_info)) == 0) {
+ dev_info(dev, "secondary fw is not flashed\n");
+ *mode = SECONDARY_BL;
+ } else if (version[FW1].base.build < secondary_fw_min_ver) {
+ dev_info(dev, "secondary fw version is too low (< %d)\n",
+ secondary_fw_min_ver);
+ *mode = SECONDARY;
+ } else if (memcmp(&version[FW2], "\0\0\0\0\0\0\0\0",
+ sizeof(struct version_info)) == 0) {
+ dev_info(dev, "primary fw is not flashed\n");
+ *mode = PRIMARY;
+ } else if (ccg_check_fw_version(uc, ccg_fw_names[PRIMARY],
+ &version[FW2].app)) {
+ dev_info(dev, "found primary fw with later version\n");
+ *mode = PRIMARY;
+ } else {
+ dev_info(dev, "secondary and primary fw are the latest\n");
+ *mode = FLASH_NOT_NEEDED;
+ }
+ return 0;
+}
+
static int ucsi_ccg_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
--
2.17.1
