drivers/jtag/jtag.c

#include <common.h>
#include <command.h>
#include <asm/arch/io.h>
#include <asm/arch/secure_apb.h>

#define JTAG_M3_AO	0
#define JTAG_M3_EE	1
#define JTAG_AP_AO	2
#define JTAG_AP_EE	3
#define JTAG_M4_AO	8
#define JTAG_M4_EE	9
#define SWD_AP_AO	10

struct jtag_pinctrl_reg_desc {
	unsigned char mode;
	volatile uint32_t *reg;
	uint32_t	val;
	uint32_t   valbak;
};

/* axg */
#if defined(CONFIG_AML_MESON_AXG)
	struct jtag_pinctrl_reg_desc regs_data[] = {
		{JTAG_AP_AO, P_AO_RTI_PINMUX_REG0, (0x4<<12) | (0x4<<16) | (0x4<<20) | (0x4<<28)},
		{JTAG_AP_EE, P_PERIPHS_PIN_MUX_4,  (0x2<<0) | (0x2<<4) | (0x2<<16) | (0x2<<20)},
	};
/* g12a/g12b/tl1 */
#elif defined(CONFIG_AML_MESON_G12A) || defined(CONFIG_AML_MESON_G12B) || defined(CONFIG_AML_MESON_TL1) || defined(CONFIG_AML_MESON_SM1) ||defined(CONFIG_AML_MESON_TM2)
	struct jtag_pinctrl_reg_desc regs_data[] = {
		{JTAG_AP_AO, P_AO_RTI_PINMUX_REG0, (1 << 24) | (1 << 28)},
		{JTAG_AP_AO, P_AO_RTI_PINMUX_REG1, (1 << 4) | (1 << 0)},
		{JTAG_AP_EE, P_PERIPHS_PIN_MUX_9, (2 << 0) | (2 << 4) | (2 << 16) | (2 << 20)},
		{SWD_AP_AO, P_AO_RTI_PINMUX_REG0, (4 << 24) | (4 << 28)},
	};
/* txhd */
#elif defined(CONFIG_AML_MESON_TXHD)
	struct jtag_pinctrl_reg_desc regs_data[] = {
		{JTAG_AP_AO, P_AO_RTI_PIN_MUX_REG, (3 << 12) | (4 << 16) | (4 << 20) | (3 << 28)},
		{JTAG_AP_EE, P_PERIPHS_PIN_MUX_9,  (2 << 0) | (2 << 4) | (2 << 16) | (2 << 20)},
	};
/* axg before */
#else
	struct jtag_pinctrl_reg_desc regs_data[] = {
		{0xff, (uint32_t *)0xffffffff, 0xffffffff},
	};

#endif

static int enabled_flag = 0;
void jtag_set_pinmux(unsigned int sel, int enable)
{
	int i;

	if (regs_data[0].mode == 0xff)
		return;
	if (enable) {
		for (i = 0; i < sizeof(regs_data)/sizeof(struct jtag_pinctrl_reg_desc); i++) {
			if (sel == regs_data[i].mode) {
				enabled_flag = 1;
				regs_data[i].valbak = readl(regs_data[i].reg);
				writel(readl(regs_data[i].reg) | regs_data[i].val, regs_data[i].reg);
			}
		}
	} else {
		if (enabled_flag == 0)
			return;
		for (i = 0; i < sizeof(regs_data)/sizeof(struct jtag_pinctrl_reg_desc); i++) {
			if (sel == regs_data[i].mode) {
				enabled_flag = 0;
				writel(regs_data[i].valbak, regs_data[i].reg);
			}
		}
	}
}