[PATCH v2 05/25] hw/sd: sd: Drop sd_crc16()

From: Bin Meng <bmeng.cn@gmail.com>
To: "Philippe Mathieu-Daudé" <f4bug@amsat.org>,
	"Alistair Francis" <alistair.francis@wdc.com>,
	qemu-block@nongnu.org, qemu-riscv@nongnu.org,
	qemu-devel@nongnu.org
Cc: Bin Meng <bin.meng@windriver.com>,
	Pragnesh Patel <pragnesh.patel@sifive.com>
Subject: [PATCH v2 05/25] hw/sd: sd: Drop sd_crc16()
Date: Sat, 23 Jan 2021 18:39:56 +0800	[thread overview]
Message-ID: <20210123104016.17485-6-bmeng.cn@gmail.com> (raw)
In-Reply-To: <20210123104016.17485-1-bmeng.cn@gmail.com>

From: Bin Meng <bin.meng@windriver.com>

commit f6fb1f9b319f ("sdcard: Correct CRC16 offset in sd_function_switch()")
changed the 16-bit CRC to be stored at offset 64. In fact, this CRC
calculation is completely wrong. From the original codes, it wants
to calculate the CRC16 of the first 64 bytes of sd->data[], however
passing 64 as the `width` to sd_crc16() actually counts 256 bytes
starting from the `message` for the CRC16 calculation, which is not
what we want.

Besides that, it seems existing sd_crc16() algorithm does not match
the SD spec, which says CRC16 is the CCITT one but the calculation
does not produce expected result. It turns out the CRC16 was never
transferred outside the sd core, as in sd_read_byte() we see:

    if (sd->data_offset >= 64)
        sd->state = sd_transfer_state;

Given above reasons, let's drop it.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Tested-by: Pragnesh Patel <pragnesh.patel@sifive.com>

---

Changes in v2:
- Fix several typos in the commit message

 hw/sd/sd.c | 18 ------------------
 1 file changed, 18 deletions(-)

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index bfea5547d5..b3952514fe 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -271,23 +271,6 @@ static uint8_t sd_crc7(const void *message, size_t width)
     return shift_reg;
 }
 
-static uint16_t sd_crc16(const void *message, size_t width)
-{
-    int i, bit;
-    uint16_t shift_reg = 0x0000;
-    const uint16_t *msg = (const uint16_t *)message;
-    width <<= 1;
-
-    for (i = 0; i < width; i ++, msg ++)
-        for (bit = 15; bit >= 0; bit --) {
-            shift_reg <<= 1;
-            if ((shift_reg >> 15) ^ ((*msg >> bit) & 1))
-                shift_reg ^= 0x1011;
-        }
-
-    return shift_reg;
-}
-
 #define OCR_POWER_DELAY_NS      500000 /* 0.5ms */
 
 FIELD(OCR, VDD_VOLTAGE_WINDOW,          0, 24)
@@ -843,7 +826,6 @@ static void sd_function_switch(SDState *sd, uint32_t arg)
         sd->data[16 - (i >> 1)] |= new_func << ((i % 2) * 4);
     }
     memset(&sd->data[17], 0, 47);
-    stw_be_p(sd->data + 64, sd_crc16(sd->data, 64));
 }
 
 static inline bool sd_wp_addr(SDState *sd, uint64_t addr)
-- 
2.25.1


