This is an automated email from Gerrit. Tomas Vanek (van...@fbl.cz) just uploaded a new patch set to Gerrit, which you can find at http://openocd.zylin.com/2604
-- gerrit commit a8235914264595de4d58ab6a2a1a158d761116db Author: Tomas Vanek <van...@fbl.cz> Date: Sat Mar 14 12:03:47 2015 +0100 AT91SAM4L: handle reset run/halt in SMAP This is a remake of http://openocd.zylin.com/1966 originally written by Angus Gratton <g...@projectgus.com> ATSAM4L has a "System Manager Access Port" (SMAP) that holds the CPU in reset if TCK is low when srst (RESET_N) is deasserted. Without this change any use of sysresetreq or srst locks the chip in reset state until power is cycled. A new function smap_reset_deassert is called as reset-deassert-post event handler. It optionally prepares reset vector catch and SMAP reset is released then. Change-Id: Iad736357b0f551725befa2b9e00f3bc54504f3d8 Signed-off-by: Tomas Vanek <van...@fbl.cz> diff --git a/doc/openocd.texi b/doc/openocd.texi index 4086437..e6ce2bc 100644 --- a/doc/openocd.texi +++ b/doc/openocd.texi @@ -5140,6 +5140,21 @@ Atmel include internal flash and use ARM's Cortex-M4 core. This driver uses the same cmd names/syntax as @xref{at91sam3}. @end deffn +@deffn {Flash Driver} at91sam4l +@cindex at91sam4l +All members of the AT91SAM4L microcontroller family from +Atmel include internal flash and use ARM's Cortex-M4 core. +This driver uses the same cmd names/syntax as @xref{at91sam3}. + +The AT91SAM4L driver adds some additional commands: +@deffn Command {at91sam4 smap_reset_deassert} +This command releases internal reset held by SMAP +and prepares reset vector catch in case of reset halt. +Command is used internally in event event reset-deassert-post. +@command{at91sam3 info} command calculations above. +@end deffn +@end deffn + @deffn {Flash Driver} at91sam7 All members of the AT91SAM7 microcontroller family from Atmel include internal flash and use ARM7TDMI cores. The driver automatically diff --git a/src/flash/nor/at91sam4l.c b/src/flash/nor/at91sam4l.c index a5eb672..74d5dbc 100644 --- a/src/flash/nor/at91sam4l.c +++ b/src/flash/nor/at91sam4l.c @@ -24,13 +24,15 @@ #include "imp.h" +#include <target/cortex_m.h> + /* At this time, the SAM4L Flash is available in these capacities: * ATSAM4Lx4xx: 256KB (512 pages) * ATSAM4Lx2xx: 128KB (256 pages) * ATSAM4Lx8xx: 512KB (1024 pages) */ -/* There are 16 lockable regions regardless of overall capacity. The number +/* There are 16 lockable regions regardless of overall capacity. The number * of pages per sector is therefore dependant on capacity. */ #define SAM4L_NUM_SECTORS 16 @@ -75,6 +77,14 @@ #define SAM4L_FMCD_CMDKEY 0xA5UL /* 'key' to issue commands, see 14.10.2 */ + +/* SMAP registers and bits */ +#define SMAP_BASE 0x400A3000 + +#define SMAP_SCR (SMAP_BASE + 8) +#define SMAP_SCR_HCR (1 << 1) + + struct sam4l_chip_info { uint32_t id; uint32_t exid; @@ -633,21 +643,47 @@ static int sam4l_write(struct flash_bank *bank, const uint8_t *buffer, return ERROR_OK; } -COMMAND_HANDLER(sam4l_handle_info_command) + +COMMAND_HANDLER(sam4l_handle_reset_deassert) { - return ERROR_OK; + struct target *target = get_current_target(CMD_CTX); + struct armv7m_common *armv7m = target_to_armv7m(target); + struct adiv5_dap *swjdp = armv7m->arm.dap; + int retval = ERROR_OK; + enum reset_types jtag_reset_config = jtag_get_reset_config(); + + /* In case of sysresetreq, debug retains state set in cortex_m_assert_reset() + * so we just release reset held by SMAP + * + * n_RESET (srst) clears the DP, so reenable debug and set vector catch here + * + * After vectreset SMAP release is not needed however makes no harm + */ + if (target->reset_halt && (jtag_reset_config & RESET_HAS_SRST)) { + retval = mem_ap_write_u32(swjdp, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN); + if (retval == ERROR_OK) + retval = mem_ap_write_atomic_u32(swjdp, DCB_DEMCR, + TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET); + /* do not return on error here, releasing SMAP reset is more important */ + } + + int retval2 = mem_ap_write_atomic_u32(swjdp, SMAP_SCR, SMAP_SCR_HCR); + if (retval2 != ERROR_OK) + return retval2; + + return retval; } static const struct command_registration at91sam4l_exec_command_handlers[] = { { - .name = "info", - .handler = sam4l_handle_info_command, + .name = "smap_reset_deassert", + .handler = sam4l_handle_reset_deassert, .mode = COMMAND_EXEC, - .help = "Print information about the current at91sam4l chip" - "and its flash configuration.", + .help = "deasert internal reset held by SMAP" }, COMMAND_REGISTRATION_DONE }; + static const struct command_registration at91sam4l_command_handlers[] = { { .name = "at91sam4l", diff --git a/tcl/target/at91sam4lXX.cfg b/tcl/target/at91sam4lXX.cfg index 93799a2..46c38ae 100644 --- a/tcl/target/at91sam4lXX.cfg +++ b/tcl/target/at91sam4lXX.cfg @@ -5,3 +5,23 @@ source [find target/at91sam4XXX.cfg] set _FLASHNAME $_CHIPNAME.flash flash bank $_FLASHNAME at91sam4l 0x00000000 0 1 1 $_TARGETNAME + +# SAM4L SMAP will hold the CPU in reset if TCK is low when RESET_N +# deasserts (see datasheet 42023E-SAM-07/2013 sec 8.11.3). +# +# smap_reset_deassert configures whether we want to run or halt out of reset, +# then instruct the SMAP to let us out of reset. +$_TARGETNAME configure -event reset-deassert-post "at91sam4l smap_reset_deassert" + +# SRST (wired to RESET_N) resets debug circuitry +# srst_pulls_trst is not configured here to avoid an error raised in reset halt +reset_config srst_gates_jtag + +# SAM4L starts from POR with SYSCLK set to 115kHz RCSYS, needs slow JTAG speed. +# Datasheet does not specify SYSCLK to JTAG/SWD clock ratio. +# Usually used SYSCLK/6 is hell slow, testing shows that debugging can work @ SYSCLK/2 +# but your mileage may vary. +adapter_khz 50 + +# System RC oscillator RCSYS starts in 3 cycles +adapter_nsrst_delay 0 -- ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. 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