flash/stm32l4x: add support of STM32WLEx devices

STM32WLEx devices are based on arm Cortex-M4 running at 48MHz,
contains a single bank of maximum 256 Kbytes of flash memory.

there is 3 variants with different Flash/RAM sizes:
  STM32WLE5JC : 256K/64K
  STM32WLE5JB : 128K/48K
  STM32WLE5J8 :  64K/20K

the work-area size is set to 20 kb to fit in STM32WLE5J8

Change-Id: Ie8e186fe4be97cbc25c53ef0ade4b4dbbcee6f66
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: http://openocd.zylin.com/5450
Tested-by: jenkins
Reviewed-by: Andreas Bolsch <hyphen0break@gmail.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

4 files changed, 125 insertions, 3 deletions

diff --git a/doc/openocd.texi b/doc/openocd.texi
index 97c5a72..25554f8 100644
--- a/doc/openocd.texi
+++ b/doc/openocd.texi
@@ -6892,7 +6892,7 @@ The @var{num} parameter is a value shown by @command{flash banks}.
 @end deffn
 
 @deffn {Flash Driver} stm32l4x
-All members of the STM32L4, STM32L4+, STM32WB and STM32G4
+All members of the STM32L4, STM32L4+, STM32WB, STM32WL and STM32G4
 microcontroller families from STMicroelectronics include internal flash
 and use ARM Cortex-M4 cores.
 Additionally this driver supports STM32G0 family with ARM Cortex-M0+ core.
diff --git a/src/flash/nor/stm32l4x.c b/src/flash/nor/stm32l4x.c
index b6f0d71..42f3394 100644
--- a/src/flash/nor/stm32l4x.c
+++ b/src/flash/nor/stm32l4x.c
@@ -75,6 +75,12 @@
  * http://www.st.com/resource/en/reference_manual/dm00622834.pdf
  */
 
+/* STM32WLxxx series for reference.
+ *
+ * RM0461 (STM32WLEx)
+ * http://www.st.com/resource/en/reference_manual/dm00530369.pdf
+ */
+
 /*
  * STM32G0xxx series for reference.
  *
@@ -132,7 +138,7 @@ struct stm32l4_flash_bank {
 };
 
 /* human readable list of families this drivers supports */
-static const char *device_families = "STM32L4/L4+/WB/G4/G0";
+static const char *device_families = "STM32L4/L4+/WB/WL/G4/G0";
 
 static const struct stm32l4_rev stm32_415_revs[] = {
 	{ 0x1000, "1" }, { 0x1001, "2" }, { 0x1003, "3" }, { 0x1007, "4" }
@@ -182,6 +188,10 @@ static const struct stm32l4_rev stm32_495_revs[] = {
 	{ 0x2001, "2.1" },
 };
 
+static const struct stm32l4_rev stm32_497_revs[] = {
+	{ 0x1000, "1.0" },
+};
+
 static const struct stm32l4_part_info stm32l4_parts[] = {
 	{
 	  .id                    = 0x415,
@@ -303,6 +313,16 @@ static const struct stm32l4_part_info stm32l4_parts[] = {
 	  .flash_regs_base       = 0x58004000,
 	  .fsize_addr            = 0x1FFF75E0,
 	},
+	{
+	  .id                    = 0x497,
+	  .revs                  = stm32_497_revs,
+	  .num_revs              = ARRAY_SIZE(stm32_497_revs),
+	  .device_str            = "STM32WLEx",
+	  .max_flash_size_kb     = 256,
+	  .has_dual_bank         = false,
+	  .flash_regs_base       = 0x58004000,
+	  .fsize_addr            = 0x1FFF75E0,
+	},
 };
 
 /* flash bank stm32l4x <base> <size> 0 0 <target#> */
@@ -918,6 +938,7 @@ static int stm32l4_probe(struct flash_bank *bank)
 	case 0x464: /* STM32L41/L42xx */
 	case 0x466: /* STM32G03/G04xx */
 	case 0x468: /* STM32G43/G44xx */
+	case 0x497: /* STM32WLEx */
 		/* single bank flash */
 		page_size_kb = 2;
 		num_pages = flash_size_kb / page_size_kb;
diff --git a/src/flash/startup.tcl b/src/flash/startup.tcl
index 9d8e910..aafb939 100644
--- a/src/flash/startup.tcl
+++ b/src/flash/startup.tcl
@@ -113,10 +113,11 @@ proc stm32f7x args { eval stm32f2x $args }
 proc stm32l0x args { eval stm32lx $args }
 proc stm32l1x args { eval stm32lx $args }
 
-# stm32[g0|g4|wb] uses the same flash driver as the stm32l4x
+# stm32[g0|g4|wb|wl] uses the same flash driver as the stm32l4x
 proc stm32g0x args { eval stm32l4x $args }
 proc stm32g4x args { eval stm32l4x $args }
 proc stm32wbx args { eval stm32l4x $args }
+proc stm32wlx args { eval stm32l4x $args }
 
 # ease migration to updated flash driver
 proc stm32x args {
diff --git a/tcl/target/stm32wlx.cfg b/tcl/target/stm32wlx.cfg
new file mode 100644
index 0000000..98c9a7e
--- /dev/null
+++ b/tcl/target/stm32wlx.cfg
@@ -0,0 +1,100 @@
+# script for stm32wlx family
+
+#
+# stm32wl devices support both JTAG and SWD transports.
+#
+source [find target/swj-dp.tcl]
+source [find mem_helper.tcl]
+
+if { [info exists CHIPNAME] } {
+	set _CHIPNAME $CHIPNAME
+} else {
+	set _CHIPNAME stm32wlx
+}
+
+set _ENDIAN little
+
+# Work-area is a space in RAM used for flash programming
+# By default use 20kB
+if { [info exists WORKAREASIZE] } {
+	set _WORKAREASIZE $WORKAREASIZE
+} else {
+	set _WORKAREASIZE 0x5000
+}
+
+#jtag scan chain
+if { [info exists CPUTAPID] } {
+	set _CPUTAPID $CPUTAPID
+} else {
+	if { [using_jtag] } {
+		set _CPUTAPID 0x6ba00477
+	} else {
+		# SWD IDCODE (single drop, arm)
+		set _CPUTAPID 0x6ba02477
+	}
+}
+
+swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
+dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
+
+if {[using_jtag]} {
+	swj_newdap $_CHIPNAME bs -irlen 5
+}
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+
+set _FLASHNAME $_CHIPNAME.flash
+flash bank $_FLASHNAME stm32l4x 0 0 0 0 $_TARGETNAME
+
+# Common knowledges tells JTAG speed should be <= F_CPU/6.
+# F_CPU after reset is MSI 4MHz, so use F_JTAG = 500 kHz to stay on
+# the safe side.
+#
+# Note that there is a pretty wide band where things are
+# more or less stable, see http://openocd.zylin.com/#/c/3366/
+adapter speed 500
+
+adapter srst delay 100
+if {[using_jtag]} {
+	jtag_ntrst_delay 100
+}
+
+reset_config srst_nogate
+
+if {![using_hla]} {
+	# if srst is not fitted use SYSRESETREQ to
+	# perform a soft reset
+	cortex_m reset_config sysresetreq
+}
+
+$_TARGETNAME configure -event reset-init {
+	# CPU comes out of reset with MSI_ON | MSI_RDY | MSI Range 4 MHz.
+	# Configure system to use MSI 24 MHz clock, compliant with VOS default Range1.
+	# 2 WS compliant with VOS=Range1 and 24 MHz.
+	mmw 0x58004000 0x00000102 0  ;# FLASH_ACR |= PRFTEN | 2(Latency)
+	mmw 0x58000000 0x00000091 0  ;# RCC_CR = MSI_ON | MSI Range 24 MHz
+	# Boost JTAG frequency
+	adapter speed 4000
+}
+
+$_TARGETNAME configure -event reset-start {
+	# Reset clock is MSI (4 MHz)
+	adapter speed 500
+}
+
+$_TARGETNAME configure -event examine-end {
+	# Enable debug during low power modes (uses more power)
+	# DBGMCU_CR |= DBG_STANDBY | DBG_STOP | DBG_SLEEP
+	mmw 0xE0042004 0x00000007 0
+
+	# Stop watchdog counters during halt
+	# DBGMCU_APB1_FZR1 |= DBG_IWDG_STOP | DBG_WWDG_STOP
+	mmw 0xE004203C 0x00001800 0
+}
+
+$_TARGETNAME configure -event trace-config {
+	# nothing to do
+}