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jtag: tm2: add SWD interface

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Change-Id: I4a31de854be2e6d3985a8fec5c11bfbc54803ec5
Signed-off-by: Lei Qian <lei.qian@amlogic.com>
This commit is contained in:
Lei Qian
2019-10-17 14:17:27 +08:00
committed by Luke Go
parent fdb67c7098
commit d32bf0570d
2 changed files with 21 additions and 2 deletions
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22
drivers/amlogic/jtag/meson_jtag.c
View File

@@ -96,6 +96,8 @@ static inline char *select_to_name(int select)
return "apao";
case AMLOGIC_JTAG_APEE:
return "apee";
case AMLOGIC_SWD_APAO:
return "swd_apao";
default:
return "disable";
}
@@ -111,6 +113,8 @@ static inline int name_to_select(const char *s)
select = AMLOGIC_JTAG_APAO;
else if (!strncmp(s, "apee", 4))
select = AMLOGIC_JTAG_APEE;
else if (!strncmp(s, "swd_apao", 8))
select = AMLOGIC_SWD_APAO;
else {
pr_err("unknown select: %s\n", s);
select = AMLOGIC_JTAG_DISABLE;
@@ -168,7 +172,7 @@ static int __init setup_jtag(char *p)
}
/*
* jtag=[apao|apee]
* jtag=[apao|apee|swd_apao]
* jtag=[apao|apee]{,[0|1]}
*
* [apao|apee]: jtag domain
@@ -356,6 +360,20 @@ static int aml_jtag_setup(struct aml_jtag_dev *jdev)
return -EINVAL;
}
break;
case AMLOGIC_SWD_APAO:
s = pinctrl_lookup_state(jdev->jtag_pinctrl,
"jtag_swd_apao_pins");
if (IS_ERR_OR_NULL(s)) {
dev_err(&jdev->pdev->dev,
"could not get swd_apao_pins state\n");
return -EINVAL;
}
ret = pinctrl_select_state(jdev->jtag_pinctrl, s);
if (ret) {
dev_err(&jdev->pdev->dev, "failed to set pinctrl\n");
return -EINVAL;
}
break;
default:
if (old_select != AMLOGIC_JTAG_DISABLE) {
devm_pinctrl_put(jdev->jtag_pinctrl);
@@ -380,7 +398,7 @@ static ssize_t jtag_select_show(struct class *cls,
len += sprintf(buf + len, "current select: %s\n\n",
select_to_name(global_select));
len += sprintf(buf + len, "usage:\n");
len += sprintf(buf + len, " echo [apao|apee] > select\n");
len += sprintf(buf + len, " echo [apao|apee|swd_apao] > select\n");
len += sprintf(buf + len, " echo [apao|apee]{,[0|1]} > select\n");
return len;

1
include/linux/amlogic/jtag.h
View File

@@ -26,6 +26,7 @@
#define AMLOGIC_JTAG_DISABLE (-1)
#define AMLOGIC_JTAG_APAO 2
#define AMLOGIC_JTAG_APEE 3
#define AMLOGIC_SWD_APAO 10
#define AMLOGIC_JTAG_ON 0x82000040
#define AMLOGIC_JTAG_OFF 0x82000041