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ch341a_spi: Refactor singleton states into reentrant pattern

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Move global singleton states into a struct and store within
the spi_master data field for the life-time of the driver.

This patchset also includes stdlib.h to be able to work with
memory allocation. Pass programmer's data as a parameter to
functions that need it.

This is one of the steps on the way to move spi_master data
memory management behind the initialisation API, for more
context see other patches under the same topic specified below.

TOPIC=register_master_api
TEST=Tested on flash W25Q128JVSQ
flashrom -E              # Result: success
flashrom -v ff.bin       # Result: verified
flashrom -w firmware.bin # Result: success
flashrom -v firmware.bin # Result: verified

Change-Id: I9fe72bff88b7f8778c1199bdab8ba43bf32e1c8c
Signed-off-by: Alexander Goncharov <chat@joursoir.net>
Ticket: https://ticket.coreboot.org/issues/391
Reviewed-on: https://review.coreboot.org/c/flashrom/+/72807
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
This commit is contained in:
Alexander Goncharov 2023-01-20 13:56:31 +04:00 committed by Anastasia Klimchuk
parent c61bbb1f9f
commit abbf988ecb
1 changed files with 84 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

162
ch341a_spi.c
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@ -17,6 +17,7 @@
* GNU General Public License for more details.
*/
#include <stdlib.h>
#include <string.h>
#include <libusb.h>
#include "flash.h"
@ -72,16 +73,18 @@
/* Number of parallel IN transfers. 32 seems to produce the most stable throughput on Windows. */
#define USB_IN_TRANSFERS 32
/* We need to use many queued IN transfers for any resemblance of performance (especially on Windows)
* because USB spec says that transfers end on non-full packets and the device sends the 31 reply
* data bytes to each 32-byte packet with command + 31 bytes of data... */
static struct libusb_transfer *transfer_out = NULL;
static struct libusb_transfer *transfer_ins[USB_IN_TRANSFERS] = {0};
struct ch341a_spi_data {
struct libusb_device_handle *handle;
/* Accumulate delays to be plucked between CS deassertion and CS assertions. */
static unsigned int stored_delay_us = 0;
/* We need to use many queued IN transfers for any resemblance of performance (especially on Windows)
* because USB spec says that transfers end on non-full packets and the device sends the 31 reply
* data bytes to each 32-byte packet with command + 31 bytes of data... */
struct libusb_transfer *transfer_out;
struct libusb_transfer *transfer_ins[USB_IN_TRANSFERS];
static struct libusb_device_handle *handle = NULL;
/* Accumulate delays to be plucked between CS deassertion and CS assertions. */
unsigned int stored_delay_us;
};
static const struct dev_entry devs_ch341a_spi[] = {
{0x1A86, 0x5512, OK, "Winchiphead (WCH)", "CH341A"},
@ -131,20 +134,21 @@ static void LIBUSB_CALL cb_in(struct libusb_transfer *transfer)
cb_common(__func__, transfer);
}
static int32_t usb_transfer(const char *func, unsigned int writecnt, unsigned int readcnt, const uint8_t *writearr, uint8_t *readarr)
static int32_t usb_transfer(const struct ch341a_spi_data *data, const char *func,
unsigned int writecnt, unsigned int readcnt, const uint8_t *writearr, uint8_t *readarr)
{
if (handle == NULL)
if (data->handle == NULL)
return -1;
int state_out = TRANS_IDLE;
transfer_out->buffer = (uint8_t*)writearr;
transfer_out->length = writecnt;
transfer_out->user_data = &state_out;
data->transfer_out->buffer = (uint8_t*)writearr;
data->transfer_out->length = writecnt;
data->transfer_out->user_data = &state_out;
/* Schedule write first */
if (writecnt > 0) {
state_out = TRANS_ACTIVE;
int ret = libusb_submit_transfer(transfer_out);
int ret = libusb_submit_transfer(data->transfer_out);
if (ret) {
msg_perr("%s: failed to submit OUT transfer: %s\n", func, libusb_error_name(ret));
state_out = TRANS_ERR;
@ -165,10 +169,10 @@ static int32_t usb_transfer(const char *func, unsigned int writecnt, unsigned in
/* Schedule new reads as long as there are free transfers and unscheduled bytes to read. */
while ((in_done + in_active) < readcnt && state_in[free_idx] == TRANS_IDLE) {
unsigned int cur_todo = min(CH341_PACKET_LENGTH - 1, readcnt - in_done - in_active);
transfer_ins[free_idx]->length = cur_todo;
transfer_ins[free_idx]->buffer = in_buf;
transfer_ins[free_idx]->user_data = &state_in[free_idx];
int ret = libusb_submit_transfer(transfer_ins[free_idx]);
data->transfer_ins[free_idx]->length = cur_todo;
data->transfer_ins[free_idx]->buffer = in_buf;
data->transfer_ins[free_idx]->user_data = &state_in[free_idx];
int ret = libusb_submit_transfer(data->transfer_ins[free_idx]);
if (ret) {
state_in[free_idx] = TRANS_ERR;
msg_perr("%s: failed to submit IN transfer: %s\n",
@ -223,14 +227,14 @@ err:
(state_out == TRANS_ERR) ? writecnt : readcnt);
/* First, we must cancel any ongoing requests and wait for them to be canceled. */
if ((writecnt > 0) && (state_out == TRANS_ACTIVE)) {
if (libusb_cancel_transfer(transfer_out) != 0)
if (libusb_cancel_transfer(data->transfer_out) != 0)
state_out = TRANS_ERR;
}
if (readcnt > 0) {
unsigned int i;
for (i = 0; i < USB_IN_TRANSFERS; i++) {
if (state_in[i] == TRANS_ACTIVE)
if (libusb_cancel_transfer(transfer_ins[i]) != 0)
if (libusb_cancel_transfer(data->transfer_ins[i]) != 0)
state_in[i] = TRANS_ERR;
}
}
@ -256,9 +260,9 @@ err:
/* Set the I2C bus speed (speed(b1b0): 0 = 20kHz; 1 = 100kHz, 2 = 400kHz, 3 = 750kHz).
* Set the SPI bus data width (speed(b2): 0 = Single, 1 = Double). */
static int32_t config_stream(uint32_t speed)
static int32_t config_stream(const struct ch341a_spi_data *data, uint32_t speed)
{
if (handle == NULL)
if (data->handle == NULL)
return -1;
uint8_t buf[] = {
@ -267,7 +271,7 @@ static int32_t config_stream(uint32_t speed)
CH341A_CMD_I2C_STM_END
};
int32_t ret = usb_transfer(__func__, sizeof(buf), 0, buf, NULL);
int32_t ret = usb_transfer(data, __func__, sizeof(buf), 0, buf, NULL);
if (ret < 0) {
msg_perr("Could not configure stream interface.\n");
}
@ -287,7 +291,7 @@ static int32_t config_stream(uint32_t speed)
* D6/21 unused (DIN2)
* D7/22 SO/2 (DIN)
*/
static int32_t enable_pins(bool enable)
static int32_t enable_pins(const struct ch341a_spi_data *data, bool enable)
{
uint8_t buf[] = {
CH341A_CMD_UIO_STREAM,
@ -296,7 +300,7 @@ static int32_t enable_pins(bool enable)
CH341A_CMD_UIO_STM_END,
};
int32_t ret = usb_transfer(__func__, sizeof(buf), 0, buf, NULL);
int32_t ret = usb_transfer(data, __func__, sizeof(buf), 0, buf, NULL);
if (ret < 0) {
msg_perr("Could not %sable output pins.\n", enable ? "en" : "dis");
}
@ -304,14 +308,14 @@ static int32_t enable_pins(bool enable)
}
/* De-assert and assert CS in one operation. */
static void pluck_cs(uint8_t *ptr)
static void pluck_cs(uint8_t *ptr, unsigned int *stored_delay_us)
{
/* This was measured to give a minimum deassertion time of 2.25 us,
* >20x more than needed for most SPI chips (100ns). */
int delay_cnt = 2;
if (stored_delay_us) {
delay_cnt = (stored_delay_us * 4) / 3;
stored_delay_us = 0;
if (*stored_delay_us) {
delay_cnt = (*stored_delay_us * 4) / 3;
*stored_delay_us = 0;
}
*ptr++ = CH341A_CMD_UIO_STREAM;
*ptr++ = CH341A_CMD_UIO_STM_OUT | 0x37; /* deasserted */
@ -324,20 +328,23 @@ static void pluck_cs(uint8_t *ptr)
static void ch341a_spi_delay(const struct flashctx *flash, unsigned int usecs)
{
struct ch341a_spi_data *data = flash->mst->spi.data;
/* There is space for 28 bytes instructions of 750 ns each in the CS packet (32 - 4 for the actual CS
* instructions), thus max 21 us, but we avoid getting too near to this boundary and use
* default_delay() for durations over 20 us. */
if ((usecs + stored_delay_us) > 20) {
unsigned int inc = 20 - stored_delay_us;
if ((usecs + data->stored_delay_us) > 20) {
unsigned int inc = 20 - data->stored_delay_us;
default_delay(usecs - inc);
usecs = inc;
}
stored_delay_us += usecs;
data->stored_delay_us += usecs;
}
static int ch341a_spi_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr)
{
if (handle == NULL)
struct ch341a_spi_data *data = flash->mst->spi.data;
if (data->handle == NULL)
return -1;
/* How many packets ... */
@ -352,7 +359,7 @@ static int ch341a_spi_spi_send_command(const struct flashctx *flash, unsigned in
uint8_t *ptr = wbuf[0];
/* CS usage is optimized by doing both transitions in one packet.
* Final transition to deselected state is in the pin disable. */
pluck_cs(ptr);
pluck_cs(ptr, &data->stored_delay_us);
unsigned int write_left = writecnt;
unsigned int read_left = readcnt;
unsigned int p;
@ -371,7 +378,7 @@ static int ch341a_spi_spi_send_command(const struct flashctx *flash, unsigned in
write_left -= write_now;
}
int32_t ret = usb_transfer(__func__, CH341_PACKET_LENGTH + packets + writecnt + readcnt,
int32_t ret = usb_transfer(data, __func__, CH341_PACKET_LENGTH + packets + writecnt + readcnt,
writecnt + readcnt, wbuf[0], rbuf);
if (ret < 0)
return -1;
@ -386,22 +393,21 @@ static int ch341a_spi_spi_send_command(const struct flashctx *flash, unsigned in
static int ch341a_spi_shutdown(void *data)
{
if (handle == NULL)
struct ch341a_spi_data *ch341a_data = data;
if (ch341a_data->handle == NULL)
return -1;
enable_pins(false);
libusb_free_transfer(transfer_out);
transfer_out = NULL;
enable_pins(ch341a_data, false);
libusb_free_transfer(ch341a_data->transfer_out);
int i;
for (i = 0; i < USB_IN_TRANSFERS; i++) {
libusb_free_transfer(transfer_ins[i]);
transfer_ins[i] = NULL;
}
libusb_release_interface(handle, 0);
libusb_attach_kernel_driver(handle, 0);
libusb_close(handle);
for (i = 0; i < USB_IN_TRANSFERS; i++)
libusb_free_transfer(ch341a_data->transfer_ins[i]);
libusb_release_interface(ch341a_data->handle, 0);
libusb_attach_kernel_driver(ch341a_data->handle, 0);
libusb_close(ch341a_data->handle);
libusb_exit(NULL);
handle = NULL;
free(data);
return 0;
}
@ -421,11 +427,6 @@ static const struct spi_master spi_master_ch341a_spi = {
static int ch341a_spi_init(const struct programmer_cfg *cfg)
{
if (handle != NULL) {
msg_cerr("%s: handle already set! Please report a bug at flashrom@flashrom.org\n", __func__);
return -1;
}
int32_t ret = libusb_init(NULL);
if (ret < 0) {
msg_perr("Couldn't initialize libusb!\n");
@ -439,27 +440,33 @@ static int ch341a_spi_init(const struct programmer_cfg *cfg)
libusb_set_option(NULL, LIBUSB_OPTION_LOG_LEVEL, LIBUSB_LOG_LEVEL_INFO);
#endif
uint16_t vid = devs_ch341a_spi[0].vendor_id;
uint16_t pid = devs_ch341a_spi[0].device_id;
handle = libusb_open_device_with_vid_pid(NULL, vid, pid);
if (handle == NULL) {
msg_perr("Couldn't open device %04x:%04x.\n", vid, pid);
return -1;
struct ch341a_spi_data *data = calloc(1, sizeof(*data));
if (!data) {
msg_perr("Out of memory!\n");
return 1;
}
ret = libusb_detach_kernel_driver(handle, 0);
uint16_t vid = devs_ch341a_spi[0].vendor_id;
uint16_t pid = devs_ch341a_spi[0].device_id;
data->handle = libusb_open_device_with_vid_pid(NULL, vid, pid);
if (data->handle == NULL) {
msg_perr("Couldn't open device %04x:%04x.\n", vid, pid);
goto free_data;
}
ret = libusb_detach_kernel_driver(data->handle, 0);
if (ret != 0 && ret != LIBUSB_ERROR_NOT_FOUND)
msg_pwarn("Cannot detach the existing USB driver. Claiming the interface may fail. %s\n",
libusb_error_name(ret));
ret = libusb_claim_interface(handle, 0);
ret = libusb_claim_interface(data->handle, 0);
if (ret != 0) {
msg_perr("Failed to claim interface 0: '%s'\n", libusb_error_name(ret));
goto close_handle;
}
struct libusb_device *dev;
if (!(dev = libusb_get_device(handle))) {
if (!(dev = libusb_get_device(data->handle))) {
msg_perr("Failed to get device from device handle.\n");
goto close_handle;
}
@ -477,44 +484,43 @@ static int ch341a_spi_init(const struct programmer_cfg *cfg)
(desc.bcdDevice >> 0) & 0x000F);
/* Allocate and pre-fill transfer structures. */
transfer_out = libusb_alloc_transfer(0);
if (!transfer_out) {
data->transfer_out = libusb_alloc_transfer(0);
if (!data->transfer_out) {
msg_perr("Failed to alloc libusb OUT transfer\n");
goto release_interface;
}
int i;
for (i = 0; i < USB_IN_TRANSFERS; i++) {
transfer_ins[i] = libusb_alloc_transfer(0);
if (transfer_ins[i] == NULL) {
data->transfer_ins[i] = libusb_alloc_transfer(0);
if (data->transfer_ins[i] == NULL) {
msg_perr("Failed to alloc libusb IN transfer %d\n", i);
goto dealloc_transfers;
}
}
/* We use these helpers but dont fill the actual buffer yet. */
libusb_fill_bulk_transfer(transfer_out, handle, WRITE_EP, NULL, 0, cb_out, NULL, USB_TIMEOUT);
libusb_fill_bulk_transfer(data->transfer_out, data->handle, WRITE_EP, NULL, 0, cb_out, NULL, USB_TIMEOUT);
for (i = 0; i < USB_IN_TRANSFERS; i++)
libusb_fill_bulk_transfer(transfer_ins[i], handle, READ_EP, NULL, 0, cb_in, NULL, USB_TIMEOUT);
libusb_fill_bulk_transfer(data->transfer_ins[i], data->handle, READ_EP, NULL, 0, cb_in, NULL, USB_TIMEOUT);
if ((config_stream(CH341A_STM_I2C_100K) < 0) || (enable_pins(true) < 0))
if ((config_stream(data, CH341A_STM_I2C_100K) < 0) || (enable_pins(data, true) < 0))
goto dealloc_transfers;
return register_spi_master(&spi_master_ch341a_spi, NULL);
return register_spi_master(&spi_master_ch341a_spi, data);
dealloc_transfers:
for (i = 0; i < USB_IN_TRANSFERS; i++) {
if (transfer_ins[i] == NULL)
if (data->transfer_ins[i] == NULL)
break;
libusb_free_transfer(transfer_ins[i]);
transfer_ins[i] = NULL;
libusb_free_transfer(data->transfer_ins[i]);
}
libusb_free_transfer(transfer_out);
transfer_out = NULL;
libusb_free_transfer(data->transfer_out);
release_interface:
libusb_release_interface(handle, 0);
libusb_release_interface(data->handle, 0);
close_handle:
libusb_attach_kernel_driver(handle, 0);
libusb_close(handle);
handle = NULL;
libusb_attach_kernel_driver(data->handle, 0);
libusb_close(data->handle);
free_data:
free(data);
return -1;
}