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cortex_a9: move dap_ap_select to arm_avi_v5
authorLuca Ellero <lroluk@gmail.com>
Sat, 12 Feb 2011 11:54:42 +0000 (11:54 +0000)
committerØyvind Harboe <oyvind.harboe@zylin.com>
Mon, 14 Feb 2011 14:29:25 +0000 (15:29 +0100)
dap_ap_select was used in the code at various points, but that can lead to
confusion, without any knowledge of what AP is really selected at some
points.
Some bugs derive from this (for example md/mw doesn't work well after
issueing "dap apsel" command).
Moving it to arm_adi_v5.c (using  mem_ap_sel* functions instead of mem_ap_*)
make the code more clear and more easier to maintain.
In the future it should be made "static" to avoid its use outside arm_adi_v5

One further benefit is the various goto has been removed as well

Signed-off-by: Luca Ellero <lroluk@gmail.com>
src/target/cortex_a9.c patch | blob | history

diff --git a/src/target/cortex_a9.c b/src/target/cortex_a9.c
index 422da3f7da0687b1810369adcb01853c2a7d9b71..95bb07f2b056590c6c3834c63ee9016496d4ce6e 100644 (file)
--- a/src/target/cortex_a9.c
+++ b/src/target/cortex_a9.c
@@ -81,45 +81,40 @@ static int cortex_a9_init_debug_access(struct target *target)
 {
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct adiv5_dap *swjdp = &armv7a->dap;
-       uint8_t saved_apsel = dap_ap_get_select(swjdp);
-
        int retval;
        uint32_t dummy;
 
-       dap_ap_select(swjdp, swjdp_debugap);
-
        LOG_DEBUG(" ");
 
        /* Unlocking the debug registers for modification */
        /* The debugport might be uninitialised so try twice */
-       retval = mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
+       retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+                       armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
        if (retval != ERROR_OK)
        {
                /* try again */
-               retval = mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
+               retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+                               armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
                if (retval == ERROR_OK)
                {
                        LOG_USER("Locking debug access failed on first, but succeeded on second try.");
                }
        }
        if (retval != ERROR_OK)
-               goto out;
+               return retval;
        /* Clear Sticky Power Down status Bit in PRSR to enable access to
           the registers in the Core Power Domain */
-       retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_PRSR, &dummy);
+       retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+                               armv7a->debug_base + CPUDBG_PRSR, &dummy);
        if (retval != ERROR_OK)
-               goto out;
+               return retval;
 
        /* Enabling of instruction execution in debug mode is done in debug_entry code */
 
        /* Resync breakpoint registers */
 
        /* Since this is likely called from init or reset, update target state information*/
-       retval = cortex_a9_poll(target);
-
- out:
-       dap_ap_select(swjdp, saved_apsel);
-       return retval;
+       return cortex_a9_poll(target);
 }
 
 /* To reduce needless round-trips, pass in a pointer to the current
@@ -143,7 +138,7 @@ static int cortex_a9_exec_opcode(struct target *target,
        long long then = timeval_ms();
        while ((dscr & DSCR_INSTR_COMP) == 0)
        {
-               retval = mem_ap_read_atomic_u32(swjdp,
+               retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                                armv7a->debug_base + CPUDBG_DSCR, &dscr);
                if (retval != ERROR_OK)
                {
@@ -157,14 +152,15 @@ static int cortex_a9_exec_opcode(struct target *target,
                }
        }
 
-       retval = mem_ap_write_u32(swjdp, armv7a->debug_base + CPUDBG_ITR, opcode);
+       retval = mem_ap_sel_write_u32(swjdp, swjdp_debugap,
+                               armv7a->debug_base + CPUDBG_ITR, opcode);
        if (retval != ERROR_OK)
                return retval;
 
        then = timeval_ms();
        do
        {
-               retval = mem_ap_read_atomic_u32(swjdp,
+               retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                                armv7a->debug_base + CPUDBG_DSCR, &dscr);
                if (retval != ERROR_OK)
                {
@@ -206,11 +202,8 @@ static int cortex_a9_read_regs_through_mem(struct target *target, uint32_t addre
        if (retval != ERROR_OK)
                return retval;
 
-       dap_ap_select(swjdp, swjdp_memoryap);
-       retval = mem_ap_read_buf_u32(swjdp, (uint8_t *)(&regfile[1]), 4*15, address);
-       if (retval != ERROR_OK)
-               return retval;
-       dap_ap_select(swjdp, swjdp_debugap);
+       retval = mem_ap_sel_read_buf_u32(swjdp, swjdp_memoryap,
+                       (uint8_t *)(&regfile[1]), 4*15, address);
 
        return retval;
 }
@@ -267,7 +260,7 @@ static int cortex_a9_dap_read_coreregister_u32(struct target *target,
        long long then = timeval_ms();
        while ((dscr & DSCR_DTR_TX_FULL) == 0)
        {
-               retval = mem_ap_read_atomic_u32(swjdp,
+               retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                                armv7a->debug_base + CPUDBG_DSCR, &dscr);
                if (retval != ERROR_OK)
                        return retval;
@@ -278,7 +271,7 @@ static int cortex_a9_dap_read_coreregister_u32(struct target *target,
                }
        }
 
-       retval = mem_ap_read_atomic_u32(swjdp,
+       retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_DTRTX, value);
        LOG_DEBUG("read DCC 0x%08" PRIx32, *value);
 
@@ -297,7 +290,7 @@ static int cortex_a9_dap_write_coreregister_u32(struct target *target,
        LOG_DEBUG("register %i, value 0x%08" PRIx32, regnum, value);
 
        /* Check that DCCRX is not full */
-       retval = mem_ap_read_atomic_u32(swjdp,
+       retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                                armv7a->debug_base + CPUDBG_DSCR, &dscr);
        if (retval != ERROR_OK)
                return retval;
@@ -316,7 +309,7 @@ static int cortex_a9_dap_write_coreregister_u32(struct target *target,
 
        /* Write DTRRX ... sets DSCR.DTRRXfull but exec_opcode() won't care */
        LOG_DEBUG("write DCC 0x%08" PRIx32, value);
-       retval = mem_ap_write_u32(swjdp,
+       retval = mem_ap_sel_write_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_DTRRX, value);
        if (retval != ERROR_OK)
                return retval;
@@ -377,7 +370,7 @@ static int cortex_a9_dap_write_memap_register_u32(struct target *target, uint32_
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct adiv5_dap *swjdp = &armv7a->dap;
 
-       retval = mem_ap_write_atomic_u32(swjdp, address, value);
+       retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap, address, value);
 
        return retval;
 }
@@ -401,7 +394,7 @@ static inline struct cortex_a9_common *dpm_to_a9(struct arm_dpm *dpm)
 static int cortex_a9_write_dcc(struct cortex_a9_common *a9, uint32_t data)
 {
        LOG_DEBUG("write DCC 0x%08" PRIx32, data);
-       return mem_ap_write_u32(&a9->armv7a_common.dap,
+       return mem_ap_sel_write_u32(&a9->armv7a_common.dap, swjdp_debugap,
                        a9->armv7a_common.debug_base + CPUDBG_DTRRX, data);
 }
 
@@ -418,7 +411,7 @@ static int cortex_a9_read_dcc(struct cortex_a9_common *a9, uint32_t *data,
        /* Wait for DTRRXfull */
        long long then = timeval_ms();
        while ((dscr & DSCR_DTR_TX_FULL) == 0) {
-               retval = mem_ap_read_atomic_u32(swjdp,
+               retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                                a9->armv7a_common.debug_base + CPUDBG_DSCR,
                                &dscr);
                if (retval != ERROR_OK)
@@ -430,7 +423,7 @@ static int cortex_a9_read_dcc(struct cortex_a9_common *a9, uint32_t *data,
                }
        }
 
-       retval = mem_ap_read_atomic_u32(swjdp,
+       retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        a9->armv7a_common.debug_base + CPUDBG_DTRTX, data);
        if (retval != ERROR_OK)
                return retval;
@@ -453,7 +446,7 @@ static int cortex_a9_dpm_prepare(struct arm_dpm *dpm)
        long long then = timeval_ms();
        for (;;)
        {
-               retval = mem_ap_read_atomic_u32(swjdp,
+               retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                                a9->armv7a_common.debug_base + CPUDBG_DSCR,
                                &dscr);
                if (retval != ERROR_OK)
@@ -690,14 +683,11 @@ static int cortex_a9_poll(struct target *target)
        struct armv7a_common *armv7a = &cortex_a9->armv7a_common;
        struct adiv5_dap *swjdp = &armv7a->dap;
        enum target_state prev_target_state = target->state;
-       uint8_t saved_apsel = dap_ap_get_select(swjdp);
 
-       dap_ap_select(swjdp, swjdp_debugap);
-       retval = mem_ap_read_atomic_u32(swjdp,
+       retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_DSCR, &dscr);
        if (retval != ERROR_OK)
        {
-               dap_ap_select(swjdp, saved_apsel);
                return retval;
        }
        cortex_a9->cpudbg_dscr = dscr;
@@ -742,8 +732,6 @@ static int cortex_a9_poll(struct target *target)
                target->state = TARGET_UNKNOWN;
        }
 
-       dap_ap_select(swjdp, saved_apsel);
-
        return retval;
 }
 
@@ -753,37 +741,36 @@ static int cortex_a9_halt(struct target *target)
        uint32_t dscr;
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct adiv5_dap *swjdp = &armv7a->dap;
-       uint8_t saved_apsel = dap_ap_get_select(swjdp);
-       dap_ap_select(swjdp, swjdp_debugap);
 
        /*
         * Tell the core to be halted by writing DRCR with 0x1
         * and then wait for the core to be halted.
         */
-       retval = mem_ap_write_atomic_u32(swjdp,
+       retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_DRCR, DRCR_HALT);
        if (retval != ERROR_OK)
-               goto out;
+               return retval;
 
        /*
         * enter halting debug mode
         */
-       retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr);
+       retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+                               armv7a->debug_base + CPUDBG_DSCR, &dscr);
        if (retval != ERROR_OK)
-               goto out;
+               return retval;
 
-       retval = mem_ap_write_atomic_u32(swjdp,
+       retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
                armv7a->debug_base + CPUDBG_DSCR, dscr | DSCR_HALT_DBG_MODE);
        if (retval != ERROR_OK)
-               goto out;
+               return retval;
 
        long long then = timeval_ms();
        for (;;)
        {
-               retval = mem_ap_read_atomic_u32(swjdp,
+               retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_DSCR, &dscr);
                if (retval != ERROR_OK)
-                       goto out;
+                       return retval;
                if ((dscr & DSCR_CORE_HALTED) != 0)
                {
                        break;
@@ -797,9 +784,7 @@ static int cortex_a9_halt(struct target *target)
 
        target->debug_reason = DBG_REASON_DBGRQ;
 
-out:
-       dap_ap_select(swjdp, saved_apsel);
-       return retval;
+       return ERROR_OK;
 }
 
 static int cortex_a9_resume(struct target *target, int current,
@@ -813,9 +798,6 @@ static int cortex_a9_resume(struct target *target, int current,
 //     struct breakpoint *breakpoint = NULL;
        uint32_t resume_pc, dscr;
 
-       uint8_t saved_apsel = dap_ap_get_select(swjdp);
-       dap_ap_select(swjdp, swjdp_debugap);
-
        if (!debug_execution)
                target_free_all_working_areas(target);
 
@@ -897,7 +879,7 @@ static int cortex_a9_resume(struct target *target, int current,
         * disable IRQs by default, with optional override...
         */
 
-       retval = mem_ap_read_atomic_u32(swjdp,
+       retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_DSCR, &dscr);
        if (retval != ERROR_OK)
                return retval;
@@ -905,20 +887,20 @@ static int cortex_a9_resume(struct target *target, int current,
        if ((dscr & DSCR_INSTR_COMP) == 0)
                LOG_ERROR("DSCR InstrCompl must be set before leaving debug!");
 
-       retval = mem_ap_write_atomic_u32(swjdp,
+       retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
                armv7a->debug_base + CPUDBG_DSCR, dscr & ~DSCR_ITR_EN);
        if (retval != ERROR_OK)
                return retval;
 
-       retval = mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DRCR,
-                       DRCR_RESTART | DRCR_CLEAR_EXCEPTIONS);
+       retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+                       armv7a->debug_base + CPUDBG_DRCR, DRCR_RESTART | DRCR_CLEAR_EXCEPTIONS);
        if (retval != ERROR_OK)
                return retval;
 
        long long then = timeval_ms();
        for (;;)
        {
-               retval = mem_ap_read_atomic_u32(swjdp,
+               retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_DSCR, &dscr);
                if (retval != ERROR_OK)
                        return retval;
@@ -950,8 +932,6 @@ static int cortex_a9_resume(struct target *target, int current,
                LOG_DEBUG("target debug resumed at 0x%" PRIx32, resume_pc);
        }
 
-       dap_ap_select(swjdp, saved_apsel);
-
        return ERROR_OK;
 }
 
@@ -970,7 +950,7 @@ static int cortex_a9_debug_entry(struct target *target)
        LOG_DEBUG("dscr = 0x%08" PRIx32, cortex_a9->cpudbg_dscr);
 
        /* REVISIT surely we should not re-read DSCR !! */
-       retval = mem_ap_read_atomic_u32(swjdp,
+       retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                                armv7a->debug_base + CPUDBG_DSCR, &dscr);
        if (retval != ERROR_OK)
                return retval;
@@ -982,7 +962,7 @@ static int cortex_a9_debug_entry(struct target *target)
 
        /* Enable the ITR execution once we are in debug mode */
        dscr |= DSCR_ITR_EN;
-       retval = mem_ap_write_atomic_u32(swjdp,
+       retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_DSCR, dscr);
        if (retval != ERROR_OK)
                return retval;
@@ -994,7 +974,7 @@ static int cortex_a9_debug_entry(struct target *target)
        if (target->debug_reason == DBG_REASON_WATCHPOINT) {
                uint32_t wfar;
 
-               retval = mem_ap_read_atomic_u32(swjdp,
+               retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                                armv7a->debug_base + CPUDBG_WFAR,
                                &wfar);
                if (retval != ERROR_OK)
@@ -1015,10 +995,9 @@ static int cortex_a9_debug_entry(struct target *target)
        }
        else
        {
-               dap_ap_select(swjdp, swjdp_memoryap);
                retval = cortex_a9_read_regs_through_mem(target,
                                regfile_working_area->address, regfile);
-               dap_ap_select(swjdp, swjdp_memoryap);
+
                target_free_working_area(target, regfile_working_area);
                if (retval != ERROR_OK)
                {
@@ -1029,7 +1008,7 @@ static int cortex_a9_debug_entry(struct target *target)
                retval = cortex_a9_dap_read_coreregister_u32(target, &cpsr, 16);
                if (retval != ERROR_OK)
                        return retval;
-               dap_ap_select(swjdp, swjdp_debugap);
+
                LOG_DEBUG("cpsr: %8.8" PRIx32, cpsr);
 
                arm_set_cpsr(armv4_5, cpsr);
@@ -1134,12 +1113,10 @@ static int cortex_a9_step(struct target *target, int current, uint32_t address,
 {
        struct armv7a_common *armv7a = target_to_armv7a(target);
        struct arm *armv4_5 = &armv7a->armv4_5_common;
-       struct adiv5_dap *swjdp = &armv7a->dap;
        struct breakpoint *breakpoint = NULL;
        struct breakpoint stepbreakpoint;
        struct reg *r;
        int retval;
-       uint8_t saved_apsel = dap_ap_get_select(swjdp);
 
        if (target->state != TARGET_HALTED)
        {
@@ -1147,8 +1124,6 @@ static int cortex_a9_step(struct target *target, int current, uint32_t address,
                return ERROR_TARGET_NOT_HALTED;
        }
 
-       dap_ap_select(swjdp, swjdp_debugap);
-
        /* current = 1: continue on current pc, otherwise continue at <address> */
        r = armv4_5->pc;
        if (!current)
@@ -1185,19 +1160,18 @@ static int cortex_a9_step(struct target *target, int current, uint32_t address,
 
        retval = cortex_a9_resume(target, 1, address, 0, 0);
        if (retval != ERROR_OK)
-               goto out;
+               return retval;
 
        long long then = timeval_ms();
        while (target->state != TARGET_HALTED)
        {
                retval = cortex_a9_poll(target);
                if (retval != ERROR_OK)
-                       goto out;
+                       return retval;
                if (timeval_ms() > then + 1000)
                {
                        LOG_ERROR("timeout waiting for target halt");
-                       retval = ERROR_FAIL;
-                       goto out;
+                       return ERROR_FAIL;
                }
        }
 
@@ -1211,11 +1185,7 @@ static int cortex_a9_step(struct target *target, int current, uint32_t address,
        if (target->state != TARGET_HALTED)
                LOG_DEBUG("target stepped");
 
-       retval = ERROR_OK;
-
- out:
-       dap_ap_select(swjdp, saved_apsel);
-       return retval;
+       return ERROR_OK;
 }
 
 static int cortex_a9_restore_context(struct target *target, bool bpwp)
@@ -1504,13 +1474,16 @@ static int cortex_a9_read_phys_memory(struct target *target,
 
                        switch (size) {
                                case 4:
-                                       retval = mem_ap_read_buf_u32(swjdp, buffer, 4 * count, address);
+                                       retval = mem_ap_sel_read_buf_u32(swjdp, swjdp_memoryap,
+                                                       buffer, 4 * count, address);
                                        break;
                                case 2:
-                                       retval = mem_ap_read_buf_u16(swjdp, buffer, 2 * count, address);
+                                       retval = mem_ap_sel_read_buf_u16(swjdp, swjdp_memoryap,
+                                                       buffer, 2 * count, address);
                                        break;
                                case 1:
-                                       retval = mem_ap_read_buf_u8(swjdp, buffer, count, address);
+                                       retval = mem_ap_sel_read_buf_u8(swjdp, swjdp_memoryap,
+                                                       buffer, count, address);
                                        break;
                        }
 
@@ -1629,13 +1602,16 @@ static int cortex_a9_write_phys_memory(struct target *target,
                        /* write memory through AHB-AP */
                        switch (size) {
                                case 4:
-                                       retval = mem_ap_write_buf_u32(swjdp, buffer, 4 * count, address);
+                                       retval = mem_ap_sel_write_buf_u32(swjdp, swjdp_memoryap,
+                                                       buffer, 4 * count, address);
                                        break;
                                case 2:
-                                       retval = mem_ap_write_buf_u16(swjdp, buffer, 2 * count, address);
+                                       retval = mem_ap_sel_write_buf_u16(swjdp, swjdp_memoryap,
+                                                       buffer, 2 * count, address);
                                        break;
                                case 1:
-                                       retval = mem_ap_write_buf_u8(swjdp, buffer, count, address);
+                                       retval = mem_ap_sel_write_buf_u8(swjdp, swjdp_memoryap,
+                                                       buffer, count, address);
                                        break;
                        }
 
@@ -1891,8 +1867,6 @@ static int cortex_a9_examine_first(struct target *target)
        if (retval != ERROR_OK)
                return retval;
 
-       dap_ap_select(swjdp, swjdp_debugap);
-
        /*
         * FIXME: assuming omap4430
         *
@@ -1906,33 +1880,33 @@ static int cortex_a9_examine_first(struct target *target)
        armv7a->debug_base = 0x80000000 |
                        ((target->coreid & 0x3) << CORTEX_A9_PADDRDBG_CPU_SHIFT);
 
-       retval = mem_ap_read_atomic_u32(swjdp,
+       retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_CPUID, &cpuid);
        if (retval != ERROR_OK)
                return retval;
 
-       if ((retval = mem_ap_read_atomic_u32(swjdp,
+       if ((retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_CPUID, &cpuid)) != ERROR_OK)
        {
                LOG_DEBUG("Examine %s failed", "CPUID");
                return retval;
        }
 
-       if ((retval = mem_ap_read_atomic_u32(swjdp,
+       if ((retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_CTYPR, &ctypr)) != ERROR_OK)
        {
                LOG_DEBUG("Examine %s failed", "CTYPR");
                return retval;
        }
 
-       if ((retval = mem_ap_read_atomic_u32(swjdp,
+       if ((retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_TTYPR, &ttypr)) != ERROR_OK)
        {
                LOG_DEBUG("Examine %s failed", "TTYPR");
                return retval;
        }
 
-       if ((retval = mem_ap_read_atomic_u32(swjdp,
+       if ((retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
                        armv7a->debug_base + CPUDBG_DIDR, &didr)) != ERROR_OK)
        {
                LOG_DEBUG("Examine %s failed", "DIDR");
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