stm32l: split l0/l1 support no jtag, different HSI settings

L0 is cortex m0+, so different id codes, SWD only, different addresses
for the clock speedup.  It has no endian options, no boundary scan.

Removed all L0 specific portions from L1 files, and renamed files to clarify
their purpose.  The deprecated stm32lx_stlink.cfg is kept as is, as it is only
around for backwards compatibility with prior releases.

Tested on STM32L053 Discovery and STM32L151 Discovery.

Has _not_ been tested with jtag on L1.

Change-Id: I8eea890d2f92a302d9e9c8a8832d218ee1b6bcfc
Signed-off-by: Karl Palsson <karlp@tweak.net.au>
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2405
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-by: Juha Niskanen <juha.niskanen@haltian.com>

tcl/board/stm32l0discovery.cfg

@@ -6,7 +6,7 @@ source [find interface/stlink-v2-1.cfg]
 transport select hla_swd
 
 set WORKAREASIZE 0x2000
-source [find target/stm32l.cfg]
+source [find target/stm32l0.cfg]
 
 # use hardware reset, connect under reset
 reset_config srst_only srst_nogate

tcl/board/stm32ldiscovery.cfg

@@ -6,7 +6,7 @@ source [find interface/stlink-v2.cfg]
 transport select hla_swd
 
 set WORKAREASIZE 0x4000
-source [find target/stm32l.cfg]
+source [find target/stm32l1.cfg]
 
 # use hardware reset, connect under reset
 reset_config srst_only srst_nogate

tcl/target/stm32l0.cfg

@@ -0,0 +1,73 @@
+#
+# M0+ devices only have SW-DP, but swj-dp code works, just don't
+# set any jtag related features
+#
+
+source [find target/swj-dp.tcl]
+
+if { [info exists CHIPNAME] } {
+   set _CHIPNAME $CHIPNAME
+} else {
+   set _CHIPNAME stm32l0
+}
+
+# Work-area is a space in RAM used for flash programming
+# By default use 8kB (max ram on smallest part)
+if { [info exists WORKAREASIZE] } {
+   set _WORKAREASIZE $WORKAREASIZE
+} else {
+   set _WORKAREASIZE 0x2000
+}
+
+# JTAG speed should be <= F_CPU/6.
+# F_CPU after reset is ~2MHz, so use F_JTAG max = 333kHz
+adapter_khz 300
+
+adapter_nsrst_delay 100
+
+if { [info exists CPUTAPID] } {
+    set _CPUTAPID $CPUTAPID
+} else {
+    # Arm, m0+, non-multidrop.
+    # http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka16088.html
+    set _CPUTAPID 0x0bc11477
+}
+
+swj_newdap $_CHIPNAME cpu -expected-id $_CPUTAPID
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME cortex_m -chain-position $_TARGETNAME
+
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+
+# flash size will be probed
+set _FLASHNAME $_CHIPNAME.flash
+flash bank $_FLASHNAME stm32lx 0x08000000 0 0 0 $_TARGETNAME
+
+if {![using_hla]} {
+   # if srst is not fitted use SYSRESETREQ to
+   # perform a soft reset
+   cortex_m reset_config sysresetreq
+}
+
+proc stm32l0_enable_HSI16 {} {
+	# Enable HSI16 as clock source
+	echo "STM32L0: Enabling HSI16"
+
+	# Set HSI16ON in RCC_CR (leave MSI enabled)
+	mww 0x40021000 0x00000101
+
+	# Set HSI16 as SYSCLK (RCC_CFGR)
+	mww 0x4002100c 0x00000001
+
+	# Increase speed
+	adapter_khz 2500
+}
+
+$_TARGETNAME configure -event reset-init {
+	stm32l0_enable_HSI16
+}
+
+$_TARGETNAME configure -event reset-start {
+	adapter_khz 300
+}

tcl/target/stm32l1.cfg

@@ -1,8 +1,7 @@
-# script for stm32l
+#
+# stm32l1 devices support both JTAG and SWD transports.
+#
 
-#
-# stm32 devices support both JTAG and SWD transports.
-#
 source [find target/swj-dp.tcl]
 
 if { [info exists CHIPNAME] } {
@@ -42,17 +41,13 @@ if { [info exists CPUTAPID] } {
       # See STM Document RM0038
       # Section 30.6.3 - corresponds to Cortex-M3 r2p0
       set _CPUTAPID 0x4ba00477
-   } {
+   } else {
-      set _CPUTAPID1 0x2ba01477
+      # SWD IDCODE (single drop, arm)
-      set _CPUTAPID2 0x0bc11477
+      set _CPUTAPID 0x2ba01477
    }
 }
 
-if { [using_jtag] } {
 swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
-} else {
-   swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID1 -expected-id $_CPUTAPID2
-}
 
 if { [info exists BSTAPID] } {
    # FIXME this never gets used to override defaults...

tcl/target/stm32l1x_dual_bank.cfg

@@ -1,6 +1,6 @@
-source [find target/stm32l.cfg]
+source [find target/stm32l1.cfg]
 
-# The stm32lx 384kb have a dual bank flash.
+# The stm32l1x 384kb have a dual bank flash.
 # Let's add a definition for the second bank here.
 
 # Add the second flash bank.

tcl/target/stm32lx_stlink.cfg

@@ -1,2 +1,2 @@
-echo "WARNING: target/stm32lx_stlink.cfg is deprecated, please switch to target/stm32l.cfg"
+echo "WARNING: target/stm32lx_stlink.cfg is deprecated, please switch to target/stm32l1.cfg"
-source [find target/stm32l.cfg]
+source [find target/stm32l1.cfg]