Rex-BC Chen has uploaded this change for review.
soc/mediatek/mt8186: Add GPIO driving functions
Add GPIO driving functions to adjust pin driving.
This implementation is according to chapter 5.1 in MT8186 Functional
Specification.
BUG=b:218775654, b:216462313, b:212375511
TEST=build pass
Signed-off-by: Guodong Liu <guodong.liu@mediatek.corp-partner.google.com>
Change-Id: I6d987f28be98b515fa5c542222bda08bea1d5118
---
M src/soc/mediatek/common/include/soc/gpio_common.h
M src/soc/mediatek/mt8186/gpio.c
M src/soc/mediatek/mt8186/include/soc/gpio.h
3 files changed, 519 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/71/62471/1
diff --git a/src/soc/mediatek/common/include/soc/gpio_common.h b/src/soc/mediatek/common/include/soc/gpio_common.h
index 283cf94..cdf0240 100644
--- a/src/soc/mediatek/common/include/soc/gpio_common.h
+++ b/src/soc/mediatek/common/include/soc/gpio_common.h
@@ -18,10 +18,50 @@
GPIO_PULL_UP = 1,
};
+/* The corresponding value of drive strength is different from different SoCs */
+enum gpio_drv {
+ GPIO_DRV0 = 0,
+ GPIO_DRV1 = 1,
+ GPIO_DRV2 = 2,
+ GPIO_DRV3 = 3,
+ GPIO_DRV4 = 4,
+ GPIO_DRV5 = 5,
+ GPIO_DRV6 = 6,
+ GPIO_DRV7 = 7,
+};
+
+/*
+ * GPIO DRIVING
+ * Special IO(I2C, HDMI...) advanced drive strength:
+ * GPIO_DRV_ADV0: 0.125mA
+ * GPIO_DRV_ADV1: 0.25mA
+ * GPIO_DRV_ADV2: 0.5mA
+ * GPIO_DRV_ADV3: 1mA
+ */
+enum gpio_drv_adv {
+ GPIO_DRV_ADV0 = 0,
+ GPIO_DRV_ADV1 = 1,
+ GPIO_DRV_ADV2 = 2,
+ GPIO_DRV_ADV3 = 3,
+};
+
+struct gpio_drv_info {
+ int32_t offset;
+ int8_t shift;
+ int8_t width;
+};
+
void gpio_set_pull(gpio_t gpio, enum pull_enable enable,
enum pull_select select);
void gpio_set_mode(gpio_t gpio, int mode);
+/* Normal driving function */
+int gpio_set_driving(gpio_t gpio, enum gpio_drv drv);
+int gpio_get_driving(gpio_t gpio);
+/* Advanced driving function */
+int gpio_set_driving_adv(gpio_t gpio, enum gpio_drv_adv drv);
+int gpio_get_driving_adv(gpio_t gpio);
+
enum gpio_irq_type {
IRQ_TYPE_EDGE_RISING,
IRQ_TYPE_EDGE_FALLING,
diff --git a/src/soc/mediatek/mt8186/gpio.c b/src/soc/mediatek/mt8186/gpio.c
index bd3ab65..b22a868 100644
--- a/src/soc/mediatek/mt8186/gpio.c
+++ b/src/soc/mediatek/mt8186/gpio.c
@@ -8,6 +8,388 @@
#include <device/mmio.h>
#include <gpio.h>
+static const struct gpio_drv_info gpio_driving_info[] = {
+ [0] = { 0x0, 27, 3, },
+ [1] = { 0x0, 27, 3, },
+ [2] = { 0x0, 27, 3, },
+ [3] = { 0x0, 27, 3, },
+ [4] = { 0x10, 0, 3, },
+ [5] = { 0x10, 0, 3, },
+ [6] = { 0x0, 9, 3, },
+ [7] = { 0x0, 9, 3, },
+ [8] = { 0x0, 9, 3, },
+ [9] = { 0x0, 12, 3, },
+ [10] = { 0x0, 0, 3, },
+ [11] = { 0x0, 3, 3, },
+ [12] = { 0x0, 6, 3, },
+ [13] = { 0x0, 0, 3, },
+ [14] = { 0x0, 3, 3, },
+ [15] = { 0x10, 3, 3, },
+ [16] = { 0x10, 3, 3, },
+ [17] = { 0x0, 21, 3, },
+ [18] = { 0x10, 0, 3, },
+ [19] = { 0x0, 27, 3, },
+ [20] = { 0x0, 24, 3, },
+ [21] = { 0x0, 27, 3, },
+ [22] = { 0x0, 24, 3, },
+ [23] = { 0x10, 0, 3, },
+ [24] = { 0x10, 9, 3, },
+ [25] = { 0x10, 0, 3, },
+ [26] = { 0x0, 27, 3, },
+ [27] = { 0x0, 27, 3, },
+ [28] = { 0x10, 0, 3, },
+ [29] = { 0x10, 0, 3, },
+ [30] = { 0x10, 0, 3, },
+ [31] = { 0x10, 3, 3, },
+ [32] = { 0x0, 6, 3, },
+ [33] = { 0x0, 6, 3, },
+ [34] = { 0x0, 3, 3, },
+ [35] = { 0x0, 3, 3, },
+ [36] = { 0x0, 9, 3, },
+ [37] = { 0x0, 9, 3, },
+ [38] = { 0x0, 12, 3, },
+ [39] = { 0x0, 9, 3, },
+ [40] = { 0x0, 15, 3, },
+ [41] = { 0x0, 12, 3, },
+ [42] = { 0x0, 12, 3, },
+ [43] = { 0x0, 12, 3, },
+ [44] = { 0x10, 6, 3, },
+ [45] = { 0x10, 3, 3, },
+ [46] = { 0x10, 3, 3, },
+ [47] = { 0x10, 6, 3, },
+ [48] = { 0x0, 15, 3, },
+ [49] = { 0x0, 15, 3, },
+ [50] = { 0x0, 15, 3, },
+ [51] = { 0x0, 18, 3, },
+ [52] = { 0x10, 3, 3, },
+ [53] = { 0x10, 6, 3, },
+ [54] = { 0x10, 3, 3, },
+ [55] = { 0x10, 3, 3, },
+ [56] = { 0x10, 3, 3, },
+ [57] = { 0x10, 6, 3, },
+ [58] = { 0x10, 6, 3, },
+ [59] = { 0x10, 3, 3, },
+ [60] = { 0x0, 24, 3, },
+ [61] = { 0x0, 24, 3, },
+ [62] = { 0x0, 24, 3, },
+ [63] = { 0x0, 24, 3, },
+ [64] = { 0x0, 27, 3, },
+ [65] = { 0x0, 27, 3, },
+ [66] = { 0x0, 27, 3, },
+ [67] = { 0x10, 0, 3, },
+ [68] = { 0x0, 0, 3, },
+ [69] = { 0x0, 3, 3, },
+ [70] = { 0x10, 3, 3, },
+ [71] = { 0x0, 6, 3, },
+ [72] = { 0x0, 9, 3, },
+ [73] = { 0x0, 12, 3, },
+ [74] = { 0x0, 15, 3, },
+ [75] = { 0x0, 18, 3, },
+ [76] = { 0x0, 21, 3, },
+ [77] = { 0x0, 24, 3, },
+ [78] = { 0x0, 27, 3, },
+ [79] = { 0x0, 24, 3, },
+ [80] = { 0x0, 24, 3, },
+ [81] = { 0x0, 21, 3, },
+ [82] = { 0x0, 21, 3, },
+ [83] = { 0x10, 3, 3, },
+ [84] = { 0x0, 6, 3, },
+ [85] = { 0x0, 9, 3, },
+ [86] = { 0x0, 12, 3, },
+ [87] = { 0x0, 15, 3, },
+ [88] = { 0x0, 18, 3, },
+ [89] = { 0x0, 21, 3, },
+ [90] = { 0x0, 27, 3, },
+ [91] = { 0x10, 0, 3, },
+ [92] = { 0x10, 0, 3, },
+ [93] = { 0x10, 0, 3, },
+ [94] = { 0x10, 0, 3, },
+ [95] = { 0x10, 3, 3, },
+ [96] = { 0x0, 9, 3, },
+ [97] = { 0x0, 6, 3, },
+ [98] = { 0x0, 3, 3, },
+ [99] = { 0x0, 18, 3, },
+ [100] = { 0x0, 18, 3, },
+ [101] = { 0x0, 21, 3, },
+ [102] = { 0x0, 21, 3, },
+ [103] = { 0x0, 21, 3, },
+ [104] = { 0x0, 21, 3, },
+ [105] = { 0x0, 24, 3, },
+ [106] = { 0x0, 24, 3, },
+ [107] = { 0x0, 24, 3, },
+ [108] = { 0x0, 24, 3, },
+ [109] = { 0x0, 27, 3, },
+ [110] = { 0x0, 27, 3, },
+ [111] = { 0x0, 27, 3, },
+ [112] = { 0x0, 27, 3, },
+ [113] = { 0x10, 0, 3, },
+ [114] = { 0x10, 0, 3, },
+ [115] = { 0x10, 6, 3, },
+ [116] = { 0x10, 9, 3, },
+ [117] = { 0x10, 6, 3, },
+ [118] = { 0x10, 6, 3, },
+ [119] = { 0x0, 18, 3, },
+ [120] = { 0x0, 9, 3, },
+ [121] = { 0x0, 12, 3, },
+ [122] = { 0x0, 15, 3, },
+ [123] = { 0x0, 21, 3, },
+ [124] = { 0x0, 0, 3, },
+ [125] = { 0x0, 3, 3, },
+ [126] = { 0x0, 6, 3, },
+ [127] = { 0x10, 12, 3, },
+ [128] = { 0x10, 18, 3, },
+ [129] = { 0x10, 12, 3, },
+ [130] = { 0x10, 18, 3, },
+ [131] = { 0x10, 15, 3, },
+ [132] = { 0x10, 21, 3, },
+ [133] = { 0x10, 15, 3, },
+ [134] = { 0x10, 21, 3, },
+ [135] = { 0x10, 6, 3, },
+ [136] = { 0x10, 15, 3, },
+ [137] = { 0x10, 18, 3, },
+ [138] = { 0x10, 24, 3, },
+ [139] = { 0x0, 21, 3, },
+ [140] = { 0x0, 24, 3, },
+ [141] = { 0x10, 15, 3, },
+ [142] = { 0x10, 21, 3, },
+ [143] = { 0x10, 9, 3, },
+ [144] = { 0x10, 18, 3, },
+ [145] = { 0x10, 12, 3, },
+ [146] = { 0x10, 21, 3, },
+ [147] = { 0x0, 12, 3, },
+ [148] = { 0x0, 12, 3, },
+ [149] = { 0x0, 12, 3, },
+ [150] = { 0x0, 15, 3, },
+ [151] = { 0x0, 15, 3, },
+ [152] = { 0x0, 9, 3, },
+ [153] = { 0x0, 15, 3, },
+ [154] = { 0x0, 15, 3, },
+ [155] = { 0x0, 18, 3, },
+ [156] = { 0x0, 18, 3, },
+ [157] = { 0x0, 0, 3, },
+ [158] = { 0x0, 0, 3, },
+ [159] = { 0x0, 0, 3, },
+ [160] = { 0x0, 0, 3, },
+ [161] = { 0x0, 6, 3, },
+ [162] = { 0x0, 3, 3, },
+ [163] = { 0x10, 12, 3, },
+ [164] = { -1, -1, -1},
+ [165] = { 0x10, 6, 3, },
+ [166] = { 0x10, 6, 3, },
+ [167] = { 0x10, 9, 3, },
+ [168] = { 0x10, 6, 3, },
+ [169] = { 0x10, 12, 3, },
+ [170] = { 0x10, 9, 3, },
+ [171] = { 0x10, 9, 3, },
+ [172] = { 0x10, 9, 3, },
+ [173] = { 0x10, 6, 3, },
+ [174] = { 0x0, 9, 3, },
+ [175] = { 0x0, 12, 3, },
+ [176] = { 0x0, 0, 3, },
+ [177] = { 0x0, 3, 3, },
+ [178] = { 0x0, 6, 3, },
+ [179] = { 0x0, 15, 3, },
+ [180] = { 0x0, 18, 3, },
+ [181] = { 0x0, 21, 3, },
+ [182] = { 0x0, 24, 3, },
+ [183] = { 0x0, 27, 3, },
+ [184] = { 0x10, 0, 3, },
+};
+
+_Static_assert(ARRAY_SIZE(gpio_driving_info) == GPIO_NUM,
+ "gpio_driving_info array size not match");
+
+static const struct gpio_drv_info gpio_driving_adv_info[] = {
+ [0] = { -1, -1, -1, },
+ [1] = { -1, -1, -1, },
+ [2] = { -1, -1, -1, },
+ [3] = { -1, -1, -1, },
+ [4] = { -1, -1, -1, },
+ [5] = { -1, -1, -1, },
+ [6] = { -1, -1, -1, },
+ [7] = { -1, -1, -1, },
+ [8] = { -1, -1, -1, },
+ [9] = { -1, -1, -1, },
+ [10] = { -1, -1, -1, },
+ [11] = { -1, -1, -1, },
+ [12] = { -1, -1, -1, },
+ [13] = { -1, -1, -1, },
+ [14] = { -1, -1, -1, },
+ [15] = { -1, -1, -1, },
+ [16] = { -1, -1, -1, },
+ [17] = { -1, -1, -1, },
+ [18] = { -1, -1, -1, },
+ [19] = { -1, -1, -1, },
+ [20] = { -1, -1, -1, },
+ [21] = { -1, -1, -1, },
+ [22] = { -1, -1, -1, },
+ [23] = { -1, -1, -1, },
+ [24] = { -1, -1, -1, },
+ [25] = { -1, -1, -1, },
+ [26] = { -1, -1, -1, },
+ [27] = { -1, -1, -1, },
+ [28] = { -1, -1, -1, },
+ [29] = { -1, -1, -1, },
+ [30] = { -1, -1, -1, },
+ [31] = { -1, -1, -1, },
+ [32] = { -1, -1, -1, },
+ [33] = { -1, -1, -1, },
+ [34] = { -1, -1, -1, },
+ [35] = { -1, -1, -1, },
+ [36] = { -1, -1, -1, },
+ [37] = { -1, -1, -1, },
+ [38] = { -1, -1, -1, },
+ [39] = { -1, -1, -1, },
+ [40] = { -1, -1, -1, },
+ [41] = { -1, -1, -1, },
+ [42] = { -1, -1, -1, },
+ [43] = { -1, -1, -1, },
+ [44] = { -1, -1, -1, },
+ [45] = { -1, -1, -1, },
+ [46] = { -1, -1, -1, },
+ [47] = { -1, -1, -1, },
+ [48] = { -1, -1, -1, },
+ [49] = { -1, -1, -1, },
+ [50] = { -1, -1, -1, },
+ [51] = { -1, -1, -1, },
+ [52] = { -1, -1, -1, },
+ [53] = { -1, -1, -1, },
+ [54] = { -1, -1, -1, },
+ [55] = { -1, -1, -1, },
+ [56] = { -1, -1, -1, },
+ [57] = { -1, -1, -1, },
+ [58] = { -1, -1, -1, },
+ [59] = { -1, -1, -1, },
+ [60] = { -1, -1, -1, },
+ [61] = { -1, -1, -1, },
+ [62] = { -1, -1, -1, },
+ [63] = { -1, -1, -1, },
+ [64] = { -1, -1, -1, },
+ [65] = { -1, -1, -1, },
+ [66] = { -1, -1, -1, },
+ [67] = { -1, -1, -1, },
+ [68] = { -1, -1, -1, },
+ [69] = { -1, -1, -1, },
+ [70] = { -1, -1, -1, },
+ [71] = { -1, -1, -1, },
+ [72] = { -1, -1, -1, },
+ [73] = { -1, -1, -1, },
+ [74] = { -1, -1, -1, },
+ [75] = { -1, -1, -1, },
+ [76] = { -1, -1, -1, },
+ [77] = { -1, -1, -1, },
+ [78] = { -1, -1, -1, },
+ [79] = { -1, -1, -1, },
+ [80] = { -1, -1, -1, },
+ [81] = { -1, -1, -1, },
+ [82] = { -1, -1, -1, },
+ [83] = { -1, -1, -1, },
+ [84] = { -1, -1, -1, },
+ [85] = { -1, -1, -1, },
+ [86] = { -1, -1, -1, },
+ [87] = { -1, -1, -1, },
+ [88] = { -1, -1, -1, },
+ [89] = { -1, -1, -1, },
+ [90] = { -1, -1, -1, },
+ [91] = { -1, -1, -1, },
+ [92] = { -1, -1, -1, },
+ [93] = { -1, -1, -1, },
+ [94] = { -1, -1, -1, },
+ [95] = { -1, -1, -1, },
+ [96] = { -1, -1, -1, },
+ [97] = { -1, -1, -1, },
+ [98] = { -1, -1, -1, },
+ [99] = { -1, -1, -1, },
+ [100] = { -1, -1, -1, },
+ [101] = { -1, -1, -1, },
+ [102] = { -1, -1, -1, },
+ [103] = { -1, -1, -1, },
+ [104] = { -1, -1, -1, },
+ [105] = { -1, -1, -1, },
+ [106] = { -1, -1, -1, },
+ [107] = { -1, -1, -1, },
+ [108] = { -1, -1, -1, },
+ [109] = { -1, -1, -1, },
+ [110] = { -1, -1, -1, },
+ [111] = { -1, -1, -1, },
+ [112] = { -1, -1, -1, },
+ [113] = { -1, -1, -1, },
+ [114] = { -1, -1, -1, },
+ [115] = { -1, -1, -1, },
+ [116] = { -1, -1, -1, },
+ [117] = { -1, -1, -1, },
+ [118] = { -1, -1, -1, },
+ [119] = { -1, -1, -1, },
+ [120] = { -1, -1, -1, },
+ [121] = { -1, -1, -1, },
+ [122] = { -1, -1, -1, },
+ [123] = { -1, -1, -1, },
+ [124] = { -1, -1, -1, },
+ [125] = { -1, -1, -1, },
+ [126] = { -1, -1, -1, },
+ [127] = { 0x30, 0, 3, },
+ [128] = { 0x30, 6, 3, },
+ [129] = { 0x30, 0, 3, },
+ [130] = { 0x30, 6, 3, },
+ [131] = { 0x30, 3, 3, },
+ [132] = { 0x30, 9, 3, },
+ [133] = { 0x30, 0, 3, },
+ [134] = { 0x30, 6, 3, },
+ [135] = { 0x20, 0, 3, },
+ [136] = { 0x20, 9, 3, },
+ [137] = { 0x30, 3, 3, },
+ [138] = { 0x30, 9, 3, },
+ [139] = { 0x20, 0, 3, },
+ [140] = { 0x20, 3, 3, },
+ [141] = { 0x30, 3, 3, },
+ [142] = { 0x30, 9, 3, },
+ [143] = { 0x20, 3, 3, },
+ [144] = { 0x20, 12, 3, },
+ [145] = { 0x20, 6, 3, },
+ [146] = { 0x20, 15, 3, },
+ [147] = { -1, -1, -1, },
+ [148] = { -1, -1, -1, },
+ [149] = { -1, -1, -1, },
+ [150] = { -1, -1, -1, },
+ [151] = { -1, -1, -1, },
+ [152] = { -1, -1, -1, },
+ [153] = { -1, -1, -1, },
+ [154] = { -1, -1, -1, },
+ [155] = { -1, -1, -1, },
+ [156] = { -1, -1, -1, },
+ [157] = { -1, -1, -1, },
+ [158] = { -1, -1, -1, },
+ [159] = { -1, -1, -1, },
+ [160] = { -1, -1, -1, },
+ [161] = { -1, -1, -1, },
+ [162] = { -1, -1, -1, },
+ [163] = { -1, -1, -1, },
+ [164] = { -1, -1, -1, },
+ [165] = { -1, -1, -1, },
+ [166] = { -1, -1, -1, },
+ [167] = { -1, -1, -1, },
+ [168] = { -1, -1, -1, },
+ [169] = { -1, -1, -1, },
+ [170] = { -1, -1, -1, },
+ [171] = { -1, -1, -1, },
+ [172] = { -1, -1, -1, },
+ [173] = { -1, -1, -1, },
+ [174] = { -1, -1, -1, },
+ [175] = { -1, -1, -1, },
+ [176] = { -1, -1, -1, },
+ [177] = { -1, -1, -1, },
+ [178] = { -1, -1, -1, },
+ [179] = { -1, -1, -1, },
+ [180] = { -1, -1, -1, },
+ [181] = { -1, -1, -1, },
+ [182] = { -1, -1, -1, },
+ [183] = { -1, -1, -1, },
+ [184] = { -1, -1, -1, },
+};
+
+_Static_assert(ARRAY_SIZE(gpio_driving_adv_info) == GPIO_NUM,
+ "gpio_driving_adv_info array size not match");
+
static void *gpio_find_reg_addr(gpio_t gpio)
{
void *reg_addr;
@@ -95,3 +477,98 @@
else
gpio_set_pull_pu_pd(gpio, enable, select);
}
+
+static inline bool is_valid_drv(enum gpio_drv drv)
+{
+ return (drv <= GPIO_DRV7 && drv >= GPIO_DRV0);
+}
+
+static inline bool is_valid_drv_adv(enum gpio_drv_adv drv)
+{
+ return (drv <= GPIO_DRV_ADV3 && drv >= GPIO_DRV_ADV0);
+}
+
+int gpio_set_driving(gpio_t gpio, enum gpio_drv drv)
+{
+ uint32_t mask;
+ const struct gpio_drv_info *info = &gpio_driving_info[gpio.id];
+ const struct gpio_drv_info *adv_info = &gpio_driving_adv_info[gpio.id];
+ void *reg, *reg_adv;
+
+ if (!is_valid_drv(drv))
+ return -1;
+
+ reg = gpio_find_reg_addr(gpio) + info->offset;
+ reg_adv = gpio_find_reg_addr(gpio) + adv_info->offset;
+
+ if (info->shift == -1)
+ return -1;
+
+ mask = BIT(info->width) - 1;
+ /* Check setting value is not beyond width */
+ if ((uint32_t)drv > mask)
+ return -1;
+
+ clrsetbits32(reg, mask << info->shift, drv << info->shift);
+
+ /* Disable EH if supported */
+ if (adv_info->shift != -1)
+ clrbits32(reg_adv, BIT(adv_info->shift));
+
+ return 0;
+}
+
+int gpio_get_driving(gpio_t gpio)
+{
+ const struct gpio_drv_info *info = &gpio_driving_info[gpio.id];
+ void *reg;
+
+ reg = gpio_find_reg_addr(gpio) + info->offset;
+ if (info->shift == -1)
+ return -1;
+
+ return (read32(reg) >> info->shift) & (BIT(info->width) - 1);
+}
+
+int gpio_set_driving_adv(gpio_t gpio, enum gpio_drv_adv drv)
+{
+ uint32_t mask;
+ const struct gpio_drv_info *adv_info = &gpio_driving_adv_info[gpio.id];
+ void *reg_adv;
+
+ if (!is_valid_drv_adv(drv))
+ return -1;
+
+ reg_adv = gpio_find_reg_addr(gpio) + adv_info->offset;
+
+ if (adv_info->shift == -1)
+ return -1;
+
+ /* Not include EH bit (the lowest bit) */
+ if ((uint32_t)drv > (BIT(adv_info->width - 1) - 1))
+ return -1;
+
+ mask = BIT(adv_info->width) - 1;
+ /* EH enable */
+ drv = (drv << 1) | BIT(0);
+
+ clrsetbits32(reg_adv, mask << adv_info->shift, drv << adv_info->shift);
+
+ return 0;
+}
+
+int gpio_get_driving_adv(gpio_t gpio)
+{
+ const struct gpio_drv_info *adv_info = &gpio_driving_adv_info[gpio.id];
+ void *reg_adv;
+ uint32_t drv;
+
+ reg_adv = gpio_find_reg_addr(gpio) + adv_info->offset;
+ if (adv_info->shift == -1)
+ return -1;
+
+ drv = (read32(reg_adv) >> adv_info->shift) & (BIT(adv_info->width) - 1);
+
+ /* Drop EH bit */
+ return drv >> 1;
+}
diff --git a/src/soc/mediatek/mt8186/include/soc/gpio.h b/src/soc/mediatek/mt8186/include/soc/gpio.h
index a47d27c..628b482 100644
--- a/src/soc/mediatek/mt8186/include/soc/gpio.h
+++ b/src/soc/mediatek/mt8186/include/soc/gpio.h
@@ -12,6 +12,8 @@
#include <soc/gpio_common.h>
#include <types.h>
+#define GPIO_NUM 185
+
enum {
MAX_GPIO_REG_BITS = 32,
MAX_GPIO_MODE_PER_REG = 8,
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