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m25p80: Add basic support for the SFDP command 

JEDEC STANDARD JESD216 for Serial Flash Discovery Parameters (SFDP)
provides a mean to describe the features of a serial flash device
using a set of internal parameter tables.

This is the initial framework for the RDSFDP command giving access to
a private SFDP area under the flash. This area now needs to be
populated with the flash device characteristics, using a new
'sfdp_read' handler under FlashPartInfo.

Reviewed-by: Francisco Iglesias <frasse.iglesias@gmail.com>
Message-Id: <20220722063602.128144-2-clg@kaod.org>
Message-Id: <20221013161241.2805140-2-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Cédric Le Goater 2022-10-24 11:20:15 +02:00
parent 104bdaffd7
commit 2389bcc259
4 changed files with 47 additions and 1 deletions
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2
MAINTAINERS
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@ -1915,7 +1915,7 @@ SSI
M: Alistair Francis <alistair@alistair23.me>
S: Maintained
F: hw/ssi/*
F: hw/block/m25p80.c
F: hw/block/m25p80*
F: include/hw/ssi/ssi.h
X: hw/ssi/xilinx_*
F: tests/qtest/m25p80-test.c

27
hw/block/m25p80.c
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@ -35,6 +35,7 @@
#include "qapi/error.h"
#include "trace.h"
#include "qom/object.h"
#include "m25p80_sfdp.h"
/* 16 MiB max in 3 byte address mode */
#define MAX_3BYTES_SIZE 0x1000000
@ -72,6 +73,7 @@ typedef struct FlashPartInfo {
* This field inform how many die is in the chip.
*/
uint8_t die_cnt;
uint8_t (*sfdp_read)(uint32_t sfdp_addr);
} FlashPartInfo;
/* adapted from linux */
@ -355,6 +357,7 @@ typedef enum {
BULK_ERASE = 0xc7,
READ_FSR = 0x70,
RDCR = 0x15,
RDSFDP = 0x5a,
READ = 0x03,
READ4 = 0x13,
@ -421,6 +424,7 @@ typedef enum {
STATE_COLLECTING_DATA,
STATE_COLLECTING_VAR_LEN_DATA,
STATE_READING_DATA,
STATE_READING_SFDP,
} CMDState;
typedef enum {
@ -679,6 +683,8 @@ static inline int get_addr_length(Flash *s)
}
switch (s->cmd_in_progress) {
case RDSFDP:
return 3;
case PP4:
case PP4_4:
case QPP_4:
@ -823,6 +829,11 @@ static void complete_collecting_data(Flash *s)
" by device\n");
}
break;
case RDSFDP:
s->state = STATE_READING_SFDP;
break;
default:
break;
}
@ -1431,6 +1442,16 @@ static void decode_new_cmd(Flash *s, uint32_t value)
qemu_log_mask(LOG_GUEST_ERROR, "M25P80: Unknown cmd %x\n", value);
}
break;
case RDSFDP:
if (s->pi->sfdp_read) {
s->needed_bytes = get_addr_length(s) + 1; /* SFDP addr + dummy */
s->pos = 0;
s->len = 0;
s->state = STATE_COLLECTING_DATA;
break;
}
/* Fallthrough */
default:
s->pos = 0;
s->len = 1;
@ -1538,6 +1559,12 @@ static uint32_t m25p80_transfer8(SSIPeripheral *ss, uint32_t tx)
}
}
break;
case STATE_READING_SFDP:
assert(s->pi->sfdp_read);
r = s->pi->sfdp_read(s->cur_addr);
trace_m25p80_read_sfdp(s, s->cur_addr, (uint8_t)r);
s->cur_addr = (s->cur_addr + 1) & (M25P80_SFDP_MAX_SIZE - 1);
break;
default:
case STATE_IDLE:

18
hw/block/m25p80_sfdp.h Normal file
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@ -0,0 +1,18 @@
/*
* M25P80 SFDP
*
* Copyright (c) 2020, IBM Corporation.
*
* This code is licensed under the GPL version 2 or later. See the
* COPYING file in the top-level directory.
*/
#ifndef HW_M25P80_SFDP_H
#define HW_M25P80_SFDP_H
/*
* SFDP area has a 3 bytes address space.
*/
#define M25P80_SFDP_MAX_SIZE (1 << 24)
#endif

1
hw/block/trace-events
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@ -80,5 +80,6 @@ m25p80_page_program(void *s, uint32_t addr, uint8_t tx) "[%p] page program cur_a
m25p80_transfer(void *s, uint8_t state, uint32_t len, uint8_t needed, uint32_t pos, uint32_t cur_addr, uint8_t t) "[%p] Transfer state 0x%"PRIx8" len 0x%"PRIx32" needed 0x%"PRIx8" pos 0x%"PRIx32" addr 0x%"PRIx32" tx 0x%"PRIx8
m25p80_read_byte(void *s, uint32_t addr, uint8_t v) "[%p] Read byte 0x%"PRIx32"=0x%"PRIx8
m25p80_read_data(void *s, uint32_t pos, uint8_t v) "[%p] Read data 0x%"PRIx32"=0x%"PRIx8
m25p80_read_sfdp(void *s, uint32_t addr, uint8_t v) "[%p] Read SFDP 0x%"PRIx32"=0x%"PRIx8
m25p80_binding(void *s) "[%p] Binding to IF_MTD drive"
m25p80_binding_no_bdrv(void *s) "[%p] No BDRV - binding to RAM"