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- Remove unused timer in CFI01 flash,

Browse Source 
- Clean up code documentation,
 - Silent a long-standing Coverity warning (2016-07-15).
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Merge remote-tracking branch 'remotes/philmd-gitlab/tags/pflash-next-20200522' into staging

- Remove unused timer in CFI01 flash,
- Clean up code documentation,
- Silent a long-standing Coverity warning (2016-07-15).

# gpg: Signature made Fri 22 May 2020 18:43:03 BST
# gpg:                using RSA key FAABE75E12917221DCFD6BB2E3E32C2CDEADC0DE
# gpg: Good signature from "Philippe Mathieu-Daudé (F4BUG) <f4bug@amsat.org>" [full]
# Primary key fingerprint: FAAB E75E 1291 7221 DCFD  6BB2 E3E3 2C2C DEAD C0DE

* remotes/philmd-gitlab/tags/pflash-next-20200522:
  hw/block/pflash: Check return value of blk_pwrite()
  hw/block/pflash_cfi01: Rename 'reset_flash' label as 'mode_read_array'
  hw/block/pflash_cfi01: Document use of non-CFI compliant command '0x00'
  hw/block/pflash_cfi01: Removed an unused timer

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2020-05-22 18:54:47 +01:00
commit fea8f3ed73
2 changed files with 42 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
hw/block/pflash_cfi01.c
View File

@ -42,7 +42,7 @@
#include "hw/qdev-properties.h"
#include "sysemu/block-backend.h"
#include "qapi/error.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "qemu/bitops.h"
#include "qemu/error-report.h"
#include "qemu/host-utils.h"
@ -91,7 +91,6 @@ struct PFlashCFI01 {
uint8_t cfi_table[0x52];
uint64_t counter;
unsigned int writeblock_size;
QEMUTimer *timer;
MemoryRegion mem;
char *name;
void *storage;
@ -115,18 +114,6 @@ static const VMStateDescription vmstate_pflash = {
}
};
static void pflash_timer (void *opaque)
{
PFlashCFI01 *pfl = opaque;
trace_pflash_timer_expired(pfl->cmd);
/* Reset flash */
pfl->status ^= 0x80;
memory_region_rom_device_set_romd(&pfl->mem, true);
pfl->wcycle = 0;
pfl->cmd = 0;
}
/* Perform a CFI query based on the bank width of the flash.
* If this code is called we know we have a device_width set for
* this flash.
@ -292,9 +279,13 @@ static uint32_t pflash_read(PFlashCFI01 *pfl, hwaddr offset,
/* This should never happen : reset state & treat it as a read */
DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
pfl->wcycle = 0;
pfl->cmd = 0;
/*
* The command 0x00 is not assigned by the CFI open standard,
* but QEMU historically uses it for the READ_ARRAY command (0xff).
*/
pfl->cmd = 0x00;
/* fall through to read code */
case 0x00:
case 0x00: /* This model reset value for READ_ARRAY (not CFI compliant) */
/* Flash area read */
ret = pflash_data_read(pfl, offset, width, be);
break;
@ -399,13 +390,18 @@ static void pflash_update(PFlashCFI01 *pfl, int offset,
int size)
{
int offset_end;
int ret;
if (pfl->blk) {
offset_end = offset + size;
/* widen to sector boundaries */
offset = QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE);
offset_end = QEMU_ALIGN_UP(offset_end, BDRV_SECTOR_SIZE);
blk_pwrite(pfl->blk, offset, pfl->storage + offset,
ret = blk_pwrite(pfl->blk, offset, pfl->storage + offset,
offset_end - offset, 0);
if (ret < 0) {
/* TODO set error bit in status */
error_report("Could not update PFLASH: %s", strerror(-ret));
}
}
}
@ -463,8 +459,8 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
case 0:
/* read mode */
switch (cmd) {
case 0x00: /* ??? */
goto reset_flash;
case 0x00: /* This model reset value for READ_ARRAY (not CFI) */
goto mode_read_array;
case 0x10: /* Single Byte Program */
case 0x40: /* Single Byte Program */
DPRINTF("%s: Single Byte Program\n", __func__);
@ -487,7 +483,7 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
case 0x50: /* Clear status bits */
DPRINTF("%s: Clear status bits\n", __func__);
pfl->status = 0x0;
goto reset_flash;
goto mode_read_array;
case 0x60: /* Block (un)lock */
DPRINTF("%s: Block unlock\n", __func__);
break;
@ -512,10 +508,10 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
break;
case 0xf0: /* Probe for AMD flash */
DPRINTF("%s: Probe for AMD flash\n", __func__);
goto reset_flash;
case 0xff: /* Read array mode */
goto mode_read_array;
case 0xff: /* Read Array */
DPRINTF("%s: Read array mode\n", __func__);
goto reset_flash;
goto mode_read_array;
default:
goto error_flash;
}
@ -541,8 +537,8 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
if (cmd == 0xd0) { /* confirm */
pfl->wcycle = 0;
pfl->status |= 0x80;
} else if (cmd == 0xff) { /* read array mode */
goto reset_flash;
} else if (cmd == 0xff) { /* Read Array */
goto mode_read_array;
} else
goto error_flash;
@ -568,16 +564,16 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
} else if (cmd == 0x01) {
pfl->wcycle = 0;
pfl->status |= 0x80;
} else if (cmd == 0xff) {
goto reset_flash;
} else if (cmd == 0xff) { /* Read Array */
goto mode_read_array;
} else {
DPRINTF("%s: Unknown (un)locking command\n", __func__);
goto reset_flash;
goto mode_read_array;
}
break;
case 0x98:
if (cmd == 0xff) {
goto reset_flash;
if (cmd == 0xff) { /* Read Array */
goto mode_read_array;
} else {
DPRINTF("%s: leaving query mode\n", __func__);
}
@ -637,7 +633,7 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
" the data is already written to storage!\n"
"Flash device reset into READ mode.\n",
__func__);
goto reset_flash;
goto mode_read_array;
}
break;
default:
@ -647,7 +643,7 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
default:
/* Should never happen */
DPRINTF("%s: invalid write state\n", __func__);
goto reset_flash;
goto mode_read_array;
}
return;
@ -656,11 +652,11 @@ static void pflash_write(PFlashCFI01 *pfl, hwaddr offset,
"(offset " TARGET_FMT_plx ", wcycle 0x%x cmd 0x%x value 0x%x)"
"\n", __func__, offset, pfl->wcycle, pfl->cmd, value);
reset_flash:
mode_read_array:
trace_pflash_reset();
memory_region_rom_device_set_romd(&pfl->mem, true);
pfl->wcycle = 0;
pfl->cmd = 0;
pfl->cmd = 0x00; /* This model reset value for READ_ARRAY (not CFI) */
}
@ -775,9 +771,12 @@ static void pflash_cfi01_realize(DeviceState *dev, Error **errp)
pfl->max_device_width = pfl->device_width;
}
pfl->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, pflash_timer, pfl);
pfl->wcycle = 0;
pfl->cmd = 0;
/*
* The command 0x00 is not assigned by the CFI open standard,
* but QEMU historically uses it for the READ_ARRAY command (0xff).
*/
pfl->cmd = 0x00;
pfl->status = 0x80; /* WSM ready */
/* Hardcoded CFI table */
/* Standard "QRY" string */

8
hw/block/pflash_cfi02.c
View File

@ -37,6 +37,7 @@
#include "hw/block/flash.h"
#include "hw/qdev-properties.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/bitmap.h"
#include "qemu/timer.h"
#include "sysemu/block-backend.h"
@ -393,13 +394,18 @@ static uint64_t pflash_read(void *opaque, hwaddr offset, unsigned int width)
static void pflash_update(PFlashCFI02 *pfl, int offset, int size)
{
int offset_end;
int ret;
if (pfl->blk) {
offset_end = offset + size;
/* widen to sector boundaries */
offset = QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE);
offset_end = QEMU_ALIGN_UP(offset_end, BDRV_SECTOR_SIZE);
blk_pwrite(pfl->blk, offset, pfl->storage + offset,
ret = blk_pwrite(pfl->blk, offset, pfl->storage + offset,
offset_end - offset, 0);
if (ret < 0) {
/* TODO set error bit in status */
error_report("Could not update PFLASH: %s", strerror(-ret));
}
}
}