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adi_v5_swd: Improve SWD support 

Fix bug in parity calculation macro.

Cache and update the selected DP bank when necessary.

Add aborts when the Ack code signals a failure (we should really only
clear the sticky bits, but this will do for now).

Change-Id: I38a4da136ba1d9e989b33c1875a80c0b1b2be874
Signed-off-by: Fatih Aşıcı <fatih.asici@gmail.com>
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/1950
Tested-by: jenkins
This commit is contained in:
Fatih Aşıcı 2014-02-14 13:37:04 +02:00 committed by Andreas Fritiofson
parent e3be699f51
commit 31138437c3
4 changed files with 121 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/jtag/swd.h
View File

@ -33,7 +33,7 @@
/* followed by TRN, 3-bits of ACK, TRN */
/* pbit16 holds precomputed parity bits for each nibble */
#define pbit(parity, nibble) (parity << nibble)
#define pbit(parity, nibble) ((parity) << (nibble))
static const uint16_t pbit16 =
pbit(0, 0) | pbit(1, 1) | pbit(1, 2) | pbit(0, 3)
@ -41,7 +41,7 @@ static const uint16_t pbit16 =
| pbit(1, 8) | pbit(0, 9) | pbit(0, 0xa) | pbit(1, 0xb)
| pbit(0, 0xc) | pbit(1, 0xd) | pbit(1, 0xe) | pbit(0, 0xf);
#define nibble_parity(nibble) (pbit16 & pbit(1, nibble))
#define nibble_parity(nibble) (pbit16 & pbit(1, (nibble)))
/**
* Construct a "cmd" byte, in lSB bit order, which swd_driver.read_reg()

112
src/target/adi_v5_swd.c
View File

@ -58,14 +58,56 @@
/* YUK! - but this is currently a global.... */
extern struct jtag_interface *jtag_interface;
static int (swd_queue_dp_write)(struct adiv5_dap *dap, unsigned reg,
uint32_t data);
static int swd_queue_ap_abort(struct adiv5_dap *dap, uint8_t *ack)
{
const struct swd_driver *swd = jtag_interface->swd;
assert(swd);
return swd->write_reg(swd_cmd(false, false, DP_ABORT),
STKCMPCLR | STKERRCLR | WDERRCLR | ORUNERRCLR);
}
/** Select the DP register bank matching bits 7:4 of reg. */
static int swd_queue_dp_bankselect(struct adiv5_dap *dap, unsigned reg)
{
uint32_t select_dp_bank = (reg & 0x000000F0) >> 4;
if (reg == DP_SELECT)
return ERROR_OK;
if (select_dp_bank == dap->dp_bank_value)
return ERROR_OK;
dap->dp_bank_value = select_dp_bank;
select_dp_bank |= dap->ap_current | dap->ap_bank_value;
return swd_queue_dp_write(dap, DP_SELECT, select_dp_bank);
}
static int swd_queue_dp_read(struct adiv5_dap *dap, unsigned reg,
uint32_t *data)
{
int retval;
/* REVISIT status return vs ack ... */
const struct swd_driver *swd = jtag_interface->swd;
assert(swd);
return swd->read_reg(swd_cmd(true, false, reg), data);
retval = swd_queue_dp_bankselect(dap, reg);
if (retval != ERROR_OK)
return retval;
retval = swd->read_reg(swd_cmd(true, false, reg), data);
if (retval != ERROR_OK) {
/* fault response */
uint8_t ack = retval & 0xff;
swd_queue_ap_abort(dap, &ack);
}
return retval;
}
static int swd_queue_idcode_read(struct adiv5_dap *dap,
@ -82,39 +124,82 @@ static int swd_queue_idcode_read(struct adiv5_dap *dap,
static int (swd_queue_dp_write)(struct adiv5_dap *dap, unsigned reg,
uint32_t data)
{
int retval;
/* REVISIT status return vs ack ... */
const struct swd_driver *swd = jtag_interface->swd;
assert(swd);
return swd->write_reg(swd_cmd(false, false, reg), data);
retval = swd_queue_dp_bankselect(dap, reg);
if (retval != ERROR_OK)
return retval;
retval = swd->write_reg(swd_cmd(false, false, reg), data);
if (retval != ERROR_OK) {
/* fault response */
uint8_t ack = retval & 0xff;
swd_queue_ap_abort(dap, &ack);
}
return retval;
}
/** Select the AP register bank matching bits 7:4 of reg. */
static int swd_queue_ap_bankselect(struct adiv5_dap *dap, unsigned reg)
{
uint32_t select_ap_bank = reg & 0x000000F0;
if (select_ap_bank == dap->ap_bank_value)
return ERROR_OK;
dap->ap_bank_value = select_ap_bank;
select_ap_bank |= dap->ap_current | dap->dp_bank_value;
return swd_queue_dp_write(dap, DP_SELECT, select_ap_bank);
}
static int (swd_queue_ap_read)(struct adiv5_dap *dap, unsigned reg,
uint32_t *data)
{
/* REVISIT APSEL ... */
/* REVISIT status return ... */
const struct swd_driver *swd = jtag_interface->swd;
assert(swd);
return swd->read_reg(swd_cmd(true, true, reg), data);
int retval = swd_queue_ap_bankselect(dap, reg);
if (retval != ERROR_OK)
return retval;
retval = swd->read_reg(swd_cmd(true, true, reg), data);
if (retval != ERROR_OK) {
/* fault response */
uint8_t ack = retval & 0xff;
swd_queue_ap_abort(dap, &ack);
}
return retval;
}
static int (swd_queue_ap_write)(struct adiv5_dap *dap, unsigned reg,
uint32_t data)
{
/* REVISIT APSEL ... */
/* REVISIT status return ... */
const struct swd_driver *swd = jtag_interface->swd;
assert(swd);
return swd->write_reg(swd_cmd(false, true, reg), data);
}
int retval = swd_queue_ap_bankselect(dap, reg);
if (retval != ERROR_OK)
return retval;
static int (swd_queue_ap_abort)(struct adiv5_dap *dap, uint8_t *ack)
{
return ERROR_FAIL;
retval = swd->write_reg(swd_cmd(false, true, reg), data);
if (retval != ERROR_OK) {
/* fault response */
uint8_t ack = retval & 0xff;
swd_queue_ap_abort(dap, &ack);
}
return retval;
}
/** Executes all queued DAP operations. */
@ -356,8 +441,13 @@ static int swd_init(struct command_context *ctx)
if (status == ERROR_OK)
LOG_INFO("SWD IDCODE %#8.8" PRIx32, idcode);
return status;
/* force clear all sticky faults */
swd_queue_ap_abort(dap, &ack);
/* this is a workaround to get polling working */
jtag_add_reset(0, 0);
return status;
}
static struct transport swd_transport = {

2
src/target/arm_adi_v5.c
View File

@ -664,6 +664,8 @@ int ahbap_debugport_init(struct adiv5_dap *dap)
/* DP initialization */
dap->dp_bank_value = 0;
retval = dap_queue_dp_read(dap, DP_CTRL_STAT, NULL);
if (retval != ERROR_OK)
return retval;

23
src/target/arm_adi_v5.h
View File

@ -47,18 +47,20 @@
#define DPAP_WRITE 0
#define DPAP_READ 1
#define BANK_REG(bank, reg) (((bank) << 4) | (reg))
/* A[3:0] for DP registers; A[1:0] are always zero.
* - JTAG accesses all of these via JTAG_DP_DPACC, except for
* IDCODE (JTAG_DP_IDCODE) and ABORT (JTAG_DP_ABORT).
* - SWD accesses these directly, sometimes needing SELECT.CTRLSEL
*/
#define DP_IDCODE 0 /* SWD: read */
#define DP_ABORT 0 /* SWD: write */
#define DP_CTRL_STAT 0x4 /* r/w */
#define DP_WCR 0x4 /* SWD: r/w (mux CTRLSEL) */
#define DP_RESEND 0x8 /* SWD: read */
#define DP_SELECT 0x8 /* JTAG: r/w; SWD: write */
#define DP_RDBUFF 0xC /* read-only */
#define DP_IDCODE BANK_REG(0x0, 0x0) /* SWD: read */
#define DP_ABORT BANK_REG(0x0, 0x0) /* SWD: write */
#define DP_CTRL_STAT BANK_REG(0x0, 0x4) /* r/w */
#define DP_RESEND BANK_REG(0x0, 0x8) /* SWD: read */
#define DP_SELECT BANK_REG(0x0, 0x8) /* JTAG: r/w; SWD: write */
#define DP_RDBUFF BANK_REG(0x0, 0xC) /* read-only */
#define DP_WCR BANK_REG(0x1, 0x4) /* SWD: r/w */
#define WCR_TO_TRN(wcr) ((uint32_t)(1 + (3 & ((wcr)) >> 8))) /* 1..4 clocks */
#define WCR_TO_PRESCALE(wcr) ((uint32_t)(7 & ((wcr)))) /* impl defined */
@ -161,6 +163,13 @@ struct adiv5_dap {
*/
uint32_t ap_bank_value;
/**
* Cache for DP_SELECT bits identifying the current four-word DP
* register bank. This caches DP register addresss bits 7:4; JTAG
* and SWD access primitves pass address bits 3:2; bits 1:0 are zero.
*/
uint32_t dp_bank_value;
/**
* Cache for (MEM-AP) AP_REG_CSW register value. This is written to
* configure an access mode, such as autoincrementing AP_REG_TAR during