const'ify flashctx to align signatures with cros flashrom

The ChromiumOS flashrom fork has since const'ify flashctx
in a few places. This aligns the function signatures to
match with downstream to ease forward porting patches
out of downstream back into mainline flashrom.

This patch is minimum viable alignment and so feedback is
welcome.

Change-Id: Iff6dbda13cb0d941481c0d204b9c30895630fbd1
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/40324
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

26 files changed, 53 insertions, 53 deletions

diff --git a/bitbang_spi.c b/bitbang_spi.c
index 7c183c39..ac50e67d 100644
--- a/bitbang_spi.c
+++ b/bitbang_spi.c
@@ -64,7 +64,7 @@ static int bitbang_spi_set_sck_get_miso(const struct bitbang_spi_master * const
 	return master->get_miso();
 }
 
-static int bitbang_spi_send_command(struct flashctx *flash,
+static int bitbang_spi_send_command(const struct flashctx *flash,
 				    unsigned int writecnt, unsigned int readcnt,
 				    const unsigned char *writearr,
 				    unsigned char *readarr);
@@ -145,7 +145,7 @@ static void bitbang_spi_write_byte(const struct bitbang_spi_master *master, uint
 	}
 }
 
-static int bitbang_spi_send_command(struct flashctx *flash,
+static int bitbang_spi_send_command(const struct flashctx *flash,
 				    unsigned int writecnt, unsigned int readcnt,
 				    const unsigned char *writearr,
 				    unsigned char *readarr)
diff --git a/buspirate_spi.c b/buspirate_spi.c
index 826bd841..fdfc0e45 100644
--- a/buspirate_spi.c
+++ b/buspirate_spi.c
@@ -128,9 +128,9 @@ static int buspirate_wait_for_string(unsigned char *buf, const char *key)
 	return ret;
 }
 
-static int buspirate_spi_send_command_v1(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int buspirate_spi_send_command_v1(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 					 const unsigned char *writearr, unsigned char *readarr);
-static int buspirate_spi_send_command_v2(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int buspirate_spi_send_command_v2(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 					 const unsigned char *writearr, unsigned char *readarr);
 
 static struct spi_master spi_master_buspirate = {
@@ -572,7 +572,7 @@ int buspirate_spi_init(void)
 	return 0;
 }
 
-static int buspirate_spi_send_command_v1(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int buspirate_spi_send_command_v1(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 					 const unsigned char *writearr, unsigned char *readarr)
 {
 	unsigned int i = 0;
@@ -625,7 +625,7 @@ static int buspirate_spi_send_command_v1(struct flashctx *flash, unsigned int wr
 	return ret;
 }
 
-static int buspirate_spi_send_command_v2(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int buspirate_spi_send_command_v2(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 					 const unsigned char *writearr, unsigned char *readarr)
 {
 	int i = 0, ret = 0;
diff --git a/ch341a_spi.c b/ch341a_spi.c
index d3af32f1..17c37ebf 100644
--- a/ch341a_spi.c
+++ b/ch341a_spi.c
@@ -335,7 +335,7 @@ void ch341a_spi_delay(unsigned int usecs)
 	stored_delay_us += usecs;
 }
 
-static int ch341a_spi_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr)
+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)
 		return -1;
diff --git a/chipdrivers.h b/chipdrivers.h
index aa240851..04963c22 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -65,8 +65,8 @@ int spi_exit_4ba(struct flashctx *flash);
 int spi_set_extended_address(struct flashctx *, uint8_t addr_high);
 
 /* spi25_statusreg.c */
-uint8_t spi_read_status_register(struct flashctx *flash);
-int spi_write_status_register(struct flashctx *flash, int status);
+uint8_t spi_read_status_register(const struct flashctx *flash);
+int spi_write_status_register(const struct flashctx *flash, int status);
 int s25fs_read_cr(struct flashctx *const flash, uint32_t addr);
 int s25fs_write_cr(struct flashctx *const flash, uint32_t addr, uint8_t data);
 int s25fs_restore_cr3nv(struct flashctx *const flash, uint8_t cfg);
diff --git a/dediprog.c b/dediprog.c
index 175e0998..1f7c3d02 100644
--- a/dediprog.c
+++ b/dediprog.c
@@ -714,7 +714,7 @@ static int dediprog_spi_write_aai(struct flashctx *flash, const uint8_t *buf, un
 	return dediprog_spi_write(flash, buf, start, len, WRITE_MODE_2B_AAI);
 }
 
-static int dediprog_spi_send_command(struct flashctx *flash,
+static int dediprog_spi_send_command(const struct flashctx *flash,
 				     unsigned int writecnt,
 				     unsigned int readcnt,
 				     const unsigned char *writearr,
diff --git a/digilent_spi.c b/digilent_spi.c
index 13a876e1..0f7a9da1 100644
--- a/digilent_spi.c
+++ b/digilent_spi.c
@@ -257,7 +257,7 @@ static int spi_tx_end(uint8_t read_follows, uint32_t tx_len)
 	return 0;
 }
 
-static int digilent_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int digilent_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 				     const unsigned char *writearr, unsigned char *readarr)
 {
 	int ret;
diff --git a/dummyflasher.c b/dummyflasher.c
index b9f61267..e1a1d801 100644
--- a/dummyflasher.c
+++ b/dummyflasher.c
@@ -93,7 +93,7 @@ static const uint8_t sfdp_table[] = {
 
 static unsigned int spi_write_256_chunksize = 256;
 
-static int dummy_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int dummy_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 				  const unsigned char *writearr, unsigned char *readarr);
 static int dummy_spi_write_256(struct flashctx *flash, const uint8_t *buf,
 			       unsigned int start, unsigned int len);
@@ -818,7 +818,7 @@ static int emulate_spi_chip_response(unsigned int writecnt,
 }
 #endif
 
-static int dummy_spi_send_command(struct flashctx *flash, unsigned int writecnt,
+static int dummy_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 				  unsigned int readcnt,
 				  const unsigned char *writearr,
 				  unsigned char *readarr)
diff --git a/flash.h b/flash.h
index 1ee0f0fe..1278e86b 100644
--- a/flash.h
+++ b/flash.h
@@ -418,8 +418,8 @@ struct spi_command {
 	unsigned char *readarr;
 };
 #define NULL_SPI_CMD { 0, 0, NULL, NULL, }
-int spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr);
-int spi_send_multicommand(struct flashctx *flash, struct spi_command *cmds);
+int spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt, const unsigned char *writearr, unsigned char *readarr);
+int spi_send_multicommand(const struct flashctx *flash, struct spi_command *cmds);
 
 enum chipbustype get_buses_supported(void);
 #endif				/* !__FLASH_H__ */
diff --git a/ft2232_spi.c b/ft2232_spi.c
index 9f4c7f03..87e60579 100644
--- a/ft2232_spi.c
+++ b/ft2232_spi.c
@@ -155,7 +155,7 @@ static int get_buf(struct ftdi_context *ftdic, const unsigned char *buf,
 	return 0;
 }
 
-static int ft2232_spi_send_command(struct flashctx *flash,
+static int ft2232_spi_send_command(const struct flashctx *flash,
 				   unsigned int writecnt, unsigned int readcnt,
 				   const unsigned char *writearr,
 				   unsigned char *readarr);
@@ -459,7 +459,7 @@ ftdi_err:
 }
 
 /* Returns 0 upon success, a negative number upon errors. */
-static int ft2232_spi_send_command(struct flashctx *flash,
+static int ft2232_spi_send_command(const struct flashctx *flash,
 				   unsigned int writecnt, unsigned int readcnt,
 				   const unsigned char *writearr,
 				   unsigned char *readarr)
diff --git a/ichspi.c b/ichspi.c
index 12ee126f..c780d525 100644
--- a/ichspi.c
+++ b/ichspi.c
@@ -1103,7 +1103,7 @@ static int run_opcode(const struct flashctx *flash, OPCODE op, uint32_t offset,
 	}
 }
 
-static int ich_spi_send_command(struct flashctx *flash, unsigned int writecnt,
+static int ich_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 				unsigned int readcnt,
 				const unsigned char *writearr,
 				unsigned char *readarr)
@@ -1506,7 +1506,7 @@ static int ich_hwseq_write(struct flashctx *flash, const uint8_t *buf, unsigned
 	return 0;
 }
 
-static int ich_spi_send_multicommand(struct flashctx *flash,
+static int ich_spi_send_multicommand(const struct flashctx *flash,
 				     struct spi_command *cmds)
 {
 	int ret = 0;
diff --git a/it85spi.c b/it85spi.c
index 5ce9193d..b9987906 100644
--- a/it85spi.c
+++ b/it85spi.c
@@ -270,7 +270,7 @@ static int it85xx_spi_common_init(struct superio s)
 	return 0;
 }
 
-static int it85xx_spi_send_command(struct flashctx *flash,
+static int it85xx_spi_send_command(const struct flashctx *flash,
 				   unsigned int writecnt, unsigned int readcnt,
 				   const unsigned char *writearr,
 				   unsigned char *readarr);
@@ -322,7 +322,7 @@ int it85xx_spi_init(struct superio s)
  *   3. read date from LPC/FWH address 0xffff_fdxxh (drive CE# low and get
  *      data from MISO)
  */
-static int it85xx_spi_send_command(struct flashctx *flash,
+static int it85xx_spi_send_command(const struct flashctx *flash,
 				   unsigned int writecnt, unsigned int readcnt,
 				   const unsigned char *writearr,
 				   unsigned char *readarr)
diff --git a/it87spi.c b/it87spi.c
index f5955fe6..8224db08 100644
--- a/it87spi.c
+++ b/it87spi.c
@@ -98,7 +98,7 @@ void probe_superio_ite(void)
 	return;
 }
 
-static int it8716f_spi_send_command(struct flashctx *flash,
+static int it8716f_spi_send_command(const struct flashctx *flash,
 				    unsigned int writecnt, unsigned int readcnt,
 				    const unsigned char *writearr,
 				    unsigned char *readarr);
@@ -275,7 +275,7 @@ int init_superio_ite(void)
  * commands with the address in inverse wire order. That's why the register
  * ordering in case 4 and 5 may seem strange.
  */
-static int it8716f_spi_send_command(struct flashctx *flash,
+static int it8716f_spi_send_command(const struct flashctx *flash,
 				    unsigned int writecnt, unsigned int readcnt,
 				    const unsigned char *writearr,
 				    unsigned char *readarr)
diff --git a/jlink_spi.c b/jlink_spi.c
index 8a69b41e..36611bf0 100644
--- a/jlink_spi.c
+++ b/jlink_spi.c
@@ -101,7 +101,7 @@ static bool deassert_cs(void)
 	return true;
 }
 
-static int jlink_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int jlink_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 		const unsigned char *writearr, unsigned char *readarr)
 {
 	uint32_t length;
diff --git a/linux_spi.c b/linux_spi.c
index aa73c181..1ef8f2b7 100644
--- a/linux_spi.c
+++ b/linux_spi.c
@@ -49,7 +49,7 @@ static int fd = -1;
 static size_t max_kernel_buf_size;
 
 static int linux_spi_shutdown(void *data);
-static int linux_spi_send_command(struct flashctx *flash, unsigned int writecnt,
+static int linux_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 				  unsigned int readcnt,
 				  const unsigned char *txbuf,
 				  unsigned char *rxbuf);
@@ -183,7 +183,7 @@ static int linux_spi_shutdown(void *data)
 	return 0;
 }
 
-static int linux_spi_send_command(struct flashctx *flash, unsigned int writecnt,
+static int linux_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 				  unsigned int readcnt,
 				  const unsigned char *txbuf,
 				  unsigned char *rxbuf)
diff --git a/lspcon_i2c_spi.c b/lspcon_i2c_spi.c
index 8de2c148..72ed78a3 100644
--- a/lspcon_i2c_spi.c
+++ b/lspcon_i2c_spi.c
@@ -98,7 +98,7 @@ static int lspcon_i2c_spi_read_data(int fd, uint16_t addr, void *buf, uint16_t l
 	return i2c_read(fd, addr, &data) == len ? 0 : SPI_GENERIC_ERROR;
 }
 
-static int get_fd_from_context(struct flashctx *flash)
+static int get_fd_from_context(const struct flashctx *flash)
 {
 	if (!flash || !flash->mst || !flash->mst->spi.data) {
 		msg_perr("Unable to extract fd from flash context.\n");
@@ -251,7 +251,7 @@ static int lspcon_i2c_spi_disable_all_protection(int fd)
 	return ret;
 }
 
-static int lspcon_i2c_spi_send_command(struct flashctx *flash,
+static int lspcon_i2c_spi_send_command(const struct flashctx *flash,
 				unsigned int writecnt, unsigned int readcnt,
 				const unsigned char *writearr,
 				unsigned char *readarr)
diff --git a/mstarddc_spi.c b/mstarddc_spi.c
index db111577..48d62045 100644
--- a/mstarddc_spi.c
+++ b/mstarddc_spi.c
@@ -153,7 +153,7 @@ out:
 }
 
 /* Returns 0 upon success, a negative number upon errors. */
-static int mstarddc_spi_send_command(struct flashctx *flash,
+static int mstarddc_spi_send_command(const struct flashctx *flash,
 				     unsigned int writecnt,
 				     unsigned int readcnt,
 				     const unsigned char *writearr,
diff --git a/pickit2_spi.c b/pickit2_spi.c
index 2936ee8d..0bc17afb 100644
--- a/pickit2_spi.c
+++ b/pickit2_spi.c
@@ -195,7 +195,7 @@ static int pickit2_set_spi_speed(unsigned int spispeed_idx)
 	return 0;
 }
 
-static int pickit2_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int pickit2_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 				     const unsigned char *writearr, unsigned char *readarr)
 {
 
diff --git a/programmer.h b/programmer.h
index f6c53996..49a9d29d 100644
--- a/programmer.h
+++ b/programmer.h
@@ -612,9 +612,9 @@ struct spi_master {
 	uint32_t features;
 	unsigned int max_data_read; // (Ideally,) maximum data read size in one go (excluding opcode+address).
 	unsigned int max_data_write; // (Ideally,) maximum data write size in one go (excluding opcode+address).
-	int (*command)(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+	int (*command)(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 		   const unsigned char *writearr, unsigned char *readarr);
-	int (*multicommand)(struct flashctx *flash, struct spi_command *cmds);
+	int (*multicommand)(const struct flashctx *flash, struct spi_command *cmds);
 
 	/* Optimized functions for this master */
 	int (*read)(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
@@ -623,9 +623,9 @@ struct spi_master {
 	const void *data;
 };
 
-int default_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+int default_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 			     const unsigned char *writearr, unsigned char *readarr);
-int default_spi_send_multicommand(struct flashctx *flash, struct spi_command *cmds);
+int default_spi_send_multicommand(const struct flashctx *flash, struct spi_command *cmds);
 int default_spi_read(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
 int default_spi_write_256(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len);
 int default_spi_write_aai(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len);
diff --git a/raiden_debug_spi.c b/raiden_debug_spi.c
index a0d65783..306d8fba 100644
--- a/raiden_debug_spi.c
+++ b/raiden_debug_spi.c
@@ -284,7 +284,7 @@ static int read_response(const struct flashctx *flash,
 	return response_packet.status_code;
 }
 
-static int send_command(struct flashctx *flash,
+static int send_command(const struct flashctx *flash,
 		unsigned int write_count,
 		unsigned int read_count,
 		const unsigned char *write_buffer,
diff --git a/sb600spi.c b/sb600spi.c
index a649253d..5892d57b 100644
--- a/sb600spi.c
+++ b/sb600spi.c
@@ -56,9 +56,9 @@ static enum amd_chipset amd_gen = CHIPSET_AMD_UNKNOWN;
 #define FIFO_SIZE_OLD		8
 #define FIFO_SIZE_YANGTZE	71
 
-static int sb600_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int sb600_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 				  const unsigned char *writearr, unsigned char *readarr);
-static int spi100_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int spi100_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 				  const unsigned char *writearr, unsigned char *readarr);
 
 static struct spi_master spi_master_sb600 = {
@@ -190,7 +190,7 @@ static int compare_internal_fifo_pointer(uint8_t want)
 }
 
 /* Check the number of bytes to be transmitted and extract opcode. */
-static int check_readwritecnt(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt)
+static int check_readwritecnt(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt)
 {
 	unsigned int maxwritecnt = flash->mst->spi.max_data_write + 3;
 	if (writecnt > maxwritecnt) {
@@ -217,7 +217,7 @@ static void execute_command(void)
 	msg_pspew("done\n");
 }
 
-static int sb600_spi_send_command(struct flashctx *flash, unsigned int writecnt,
+static int sb600_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 				  unsigned int readcnt,
 				  const unsigned char *writearr,
 				  unsigned char *readarr)
@@ -303,7 +303,7 @@ static int sb600_spi_send_command(struct flashctx *flash, unsigned int writecnt,
 	return 0;
 }
 
-static int spi100_spi_send_command(struct flashctx *flash, unsigned int writecnt,
+static int spi100_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 				  unsigned int readcnt,
 				  const unsigned char *writearr,
 				  unsigned char *readarr)
diff --git a/serprog.c b/serprog.c
index 37a9db41..1befce10 100644
--- a/serprog.c
+++ b/serprog.c
@@ -295,7 +295,7 @@ static int sp_stream_buffer_op(uint8_t cmd, uint32_t parmlen, uint8_t *parms)
 	return 0;
 }
 
-static int serprog_spi_send_command(struct flashctx *flash,
+static int serprog_spi_send_command(const struct flashctx *flash,
 				    unsigned int writecnt, unsigned int readcnt,
 				    const unsigned char *writearr,
 				    unsigned char *readarr);
@@ -894,7 +894,7 @@ void serprog_delay(unsigned int usecs)
 	sp_prev_was_write = 0;
 }
 
-static int serprog_spi_send_command(struct flashctx *flash,
+static int serprog_spi_send_command(const struct flashctx *flash,
 				    unsigned int writecnt, unsigned int readcnt,
 				    const unsigned char *writearr,
 				    unsigned char *readarr)
diff --git a/spi.c b/spi.c
index 489baf30..aed2a927 100644
--- a/spi.c
+++ b/spi.c
@@ -26,7 +26,7 @@
 #include "programmer.h"
 #include "spi.h"
 
-int spi_send_command(struct flashctx *flash, unsigned int writecnt,
+int spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 		     unsigned int readcnt, const unsigned char *writearr,
 		     unsigned char *readarr)
 {
@@ -34,12 +34,12 @@ int spi_send_command(struct flashctx *flash, unsigned int writecnt,
 				       readarr);
 }
 
-int spi_send_multicommand(struct flashctx *flash, struct spi_command *cmds)
+int spi_send_multicommand(const struct flashctx *flash, struct spi_command *cmds)
 {
 	return flash->mst->spi.multicommand(flash, cmds);
 }
 
-int default_spi_send_command(struct flashctx *flash, unsigned int writecnt,
+int default_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 			     unsigned int readcnt,
 			     const unsigned char *writearr,
 			     unsigned char *readarr)
@@ -60,7 +60,7 @@ int default_spi_send_command(struct flashctx *flash, unsigned int writecnt,
 	return spi_send_multicommand(flash, cmd);
 }
 
-int default_spi_send_multicommand(struct flashctx *flash,
+int default_spi_send_multicommand(const struct flashctx *flash,
 				  struct spi_command *cmds)
 {
 	int result = 0;
diff --git a/spi25_statusreg.c b/spi25_statusreg.c
index aa574d5a..083a832f 100644
--- a/spi25_statusreg.c
+++ b/spi25_statusreg.c
@@ -22,7 +22,7 @@
 #include "spi.h"
 
 /* === Generic functions === */
-static int spi_write_status_register_flag(struct flashctx *flash, int status, const unsigned char enable_opcode)
+static int spi_write_status_register_flag(const struct flashctx *flash, int status, const unsigned char enable_opcode)
 {
 	int result;
 	int i = 0;
@@ -73,7 +73,7 @@ static int spi_write_status_register_flag(struct flashctx *flash, int status, co
 	return 0;
 }
 
-int spi_write_status_register(struct flashctx *flash, int status)
+int spi_write_status_register(const struct flashctx *flash, int status)
 {
 	int feature_bits = flash->chip->feature_bits;
 	int ret = 1;
@@ -90,7 +90,7 @@ int spi_write_status_register(struct flashctx *flash, int status)
 	return ret;
 }
 
-uint8_t spi_read_status_register(struct flashctx *flash)
+uint8_t spi_read_status_register(const struct flashctx *flash)
 {
 	static const unsigned char cmd[JEDEC_RDSR_OUTSIZE] = { JEDEC_RDSR };
 	/* FIXME: No workarounds for driver/hardware bugs in generic code. */
diff --git a/stlinkv3_spi.c b/stlinkv3_spi.c
index 114c0cab..ae865be1 100644
--- a/stlinkv3_spi.c
+++ b/stlinkv3_spi.c
@@ -323,7 +323,7 @@ static int stlinkv3_spi_set_SPI_NSS(enum spi_nss_level nss_level)
 	return 0;
 }
 
-static int stlinkv3_spi_transmit(struct flashctx *flash,
+static int stlinkv3_spi_transmit(const struct flashctx *flash,
 				 unsigned int write_cnt,
 				 unsigned int read_cnt,
 				 const unsigned char *write_arr,
diff --git a/usbblaster_spi.c b/usbblaster_spi.c
index e2a0a4f2..46de86c8 100644
--- a/usbblaster_spi.c
+++ b/usbblaster_spi.c
@@ -179,7 +179,7 @@ static int send_read(unsigned int readcnt, unsigned char *readarr)
 }
 
 /* Returns 0 upon success, a negative number upon errors. */
-static int usbblaster_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+static int usbblaster_spi_send_command(const struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
 				       const unsigned char *writearr, unsigned char *readarr)
 {
 	uint8_t cmd;
diff --git a/wbsio_spi.c b/wbsio_spi.c
index f4f6af90..1674825e 100644
--- a/wbsio_spi.c
+++ b/wbsio_spi.c
@@ -57,7 +57,7 @@ done:
 	return flashport;
 }
 
-static int wbsio_spi_send_command(struct flashctx *flash, unsigned int writecnt,
+static int wbsio_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 				  unsigned int readcnt,
 				  const unsigned char *writearr,
 				  unsigned char *readarr);
@@ -110,7 +110,7 @@ int wbsio_check_for_spi(void)
  * Would one more byte of RAM in the chip (to get all 24 bits) really make
  * such a big difference?
  */
-static int wbsio_spi_send_command(struct flashctx *flash, unsigned int writecnt,
+static int wbsio_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
 				  unsigned int readcnt,
 				  const unsigned char *writearr,
 				  unsigned char *readarr)