From 066d471ae6dd34eda370c5f610adaefa1029bab9 Mon Sep 17 00:00:00 2001
From: Solomon Peachy <pizza@shaftnet.org>
Date: Wed, 8 Jul 2020 12:26:04 -0400
Subject: ATA:  Check to see if the ATA device is solid-state (WIP)

Not all devices advertise this flag, unfortunately.

Change-Id: I6d666febdfcba7598e4d29df7d05c0a288e15158
---
 firmware/drivers/ata.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'firmware')

diff --git a/firmware/drivers/ata.c b/firmware/drivers/ata.c
index 39c305c3df..db39255256 100644
--- a/firmware/drivers/ata.c
+++ b/firmware/drivers/ata.c
@@ -332,6 +332,19 @@ static ICODE_ATTR void copy_write_sectors(const unsigned char* buf,
 }
 #endif /* !ATA_OPTIMIZED_WRITING */
 
+static inline int ata_disk_isssd(void)
+{
+    /* offset 217 is "Nominal Rotation rate"
+       0x0000 == Not reported
+       0x0001 == Solid State
+       0x0401 -> 0xffe == RPM
+       All others reserved
+
+       Some CF cards return 0x0100 (ie byteswapped 0x0001) so accept either
+     */
+    return (identify_info[217] == 0x0001 || identify_info[217] == 0x0100);
+}
+
 static int ata_transfer_sectors(unsigned long start,
                                 int incount,
                                 void* inbuf,
-- 
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