projects / thirdparty / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| cc54a0f7 TK |
2 | /* |
| 3 | * Copyright (C) 2012 Boundary Devices Inc. | |
| cc54a0f7 | 4 | */ |
| d678a59d | 5 | #include <common.h> |
| c6f3f323 | 6 | #include <malloc.h> |
| cc54a0f7 TK |
7 | #include <asm/arch/clock.h> |
| 8 | #include <asm/arch/imx-regs.h> | |
| c05ed00a | 9 | #include <linux/delay.h> |
| 1221ce45 | 10 | #include <linux/errno.h> |
| cc54a0f7 | 11 | #include <asm/gpio.h> |
| 552a848e | 12 | #include <asm/mach-imx/mxc_i2c.h> |
| cc54a0f7 TK |
13 | #include <watchdog.h> |
| 14 | ||
| 71204e95 | 15 | int force_idle_bus(void *priv) |
| cc54a0f7 TK |
16 | { |
| 17 | int i; | |
| 18 | int sda, scl; | |
| 19 | ulong elapsed, start_time; | |
| 20 | struct i2c_pads_info *p = (struct i2c_pads_info *)priv; | |
| 21 | int ret = 0; | |
| 22 | ||
| 23 | gpio_direction_input(p->sda.gp); | |
| 24 | gpio_direction_input(p->scl.gp); | |
| 25 | ||
| 26 | imx_iomux_v3_setup_pad(p->sda.gpio_mode); | |
| 27 | imx_iomux_v3_setup_pad(p->scl.gpio_mode); | |
| 28 | ||
| 29 | sda = gpio_get_value(p->sda.gp); | |
| 30 | scl = gpio_get_value(p->scl.gp); | |
| 31 | if ((sda & scl) == 1) | |
| 32 | goto exit; /* Bus is idle already */ | |
| 33 | ||
| 34 | printf("%s: sda=%d scl=%d sda.gp=0x%x scl.gp=0x%x\n", __func__, | |
| 35 | sda, scl, p->sda.gp, p->scl.gp); | |
| 36 | /* Send high and low on the SCL line */ | |
| 37 | for (i = 0; i < 9; i++) { | |
| 38 | gpio_direction_output(p->scl.gp, 0); | |
| 39 | udelay(50); | |
| 40 | gpio_direction_input(p->scl.gp); | |
| 41 | udelay(50); | |
| 42 | } | |
| 43 | start_time = get_timer(0); | |
| 44 | for (;;) { | |
| 45 | sda = gpio_get_value(p->sda.gp); | |
| 46 | scl = gpio_get_value(p->scl.gp); | |
| 47 | if ((sda & scl) == 1) | |
| 48 | break; | |
| 29caf930 | 49 | schedule(); |
| cc54a0f7 TK |
50 | elapsed = get_timer(start_time); |
| 51 | if (elapsed > (CONFIG_SYS_HZ / 5)) { /* .2 seconds */ | |
| 52 | ret = -EBUSY; | |
| 53 | printf("%s: failed to clear bus, sda=%d scl=%d\n", | |
| 54 | __func__, sda, scl); | |
| 55 | break; | |
| 56 | } | |
| 57 | } | |
| 58 | exit: | |
| 59 | imx_iomux_v3_setup_pad(p->sda.i2c_mode); | |
| 60 | imx_iomux_v3_setup_pad(p->scl.i2c_mode); | |
| 61 | return ret; | |
| 62 | } | |
| 63 | ||
| 64 | static void * const i2c_bases[] = { | |
| 65 | (void *)I2C1_BASE_ADDR, | |
| 66 | (void *)I2C2_BASE_ADDR, | |
| 67 | #ifdef I2C3_BASE_ADDR | |
| 68 | (void *)I2C3_BASE_ADDR, | |
| 69 | #endif | |
| 21a26940 HS |
70 | #ifdef I2C4_BASE_ADDR |
| 71 | (void *)I2C4_BASE_ADDR, | |
| 72 | #endif | |
| c92c3a44 MW |
73 | #ifdef I2C5_BASE_ADDR |
| 74 | (void *)I2C5_BASE_ADDR, | |
| 75 | #endif | |
| 76 | #ifdef I2C6_BASE_ADDR | |
| 77 | (void *)I2C6_BASE_ADDR, | |
| 78 | #endif | |
| cc54a0f7 TK |
79 | }; |
| 80 | ||
| 21a26940 | 81 | /* i2c_index can be from 0 - 3 */ |
| edbf8b4f SG |
82 | int setup_i2c(unsigned i2c_index, int speed, int slave_addr, |
| 83 | struct i2c_pads_info *p) | |
| cc54a0f7 | 84 | { |
| cd3c5896 | 85 | char name[9]; |
| edbf8b4f SG |
86 | int ret; |
| 87 | ||
| cc54a0f7 | 88 | if (i2c_index >= ARRAY_SIZE(i2c_bases)) |
| edbf8b4f | 89 | return -EINVAL; |
| c6f3f323 | 90 | |
| cd3c5896 MV |
91 | snprintf(name, sizeof(name), "i2c_sda%01d", i2c_index); |
| 92 | ret = gpio_request(p->sda.gp, name); | |
| c6f3f323 | 93 | if (ret) |
| cd3c5896 | 94 | return ret; |
| c6f3f323 | 95 | |
| cd3c5896 MV |
96 | snprintf(name, sizeof(name), "i2c_scl%01d", i2c_index); |
| 97 | ret = gpio_request(p->scl.gp, name); | |
| c6f3f323 | 98 | if (ret) |
| cd3c5896 | 99 | goto err_req; |
| c6f3f323 | 100 | |
| cc54a0f7 | 101 | /* Enable i2c clock */ |
| edbf8b4f SG |
102 | ret = enable_i2c_clk(1, i2c_index); |
| 103 | if (ret) | |
| 104 | goto err_clk; | |
| 105 | ||
| cc54a0f7 | 106 | /* Make sure bus is idle */ |
| edbf8b4f SG |
107 | ret = force_idle_bus(p); |
| 108 | if (ret) | |
| 109 | goto err_idle; | |
| 110 | ||
| 2147a169 | 111 | #if !CONFIG_IS_ENABLED(DM_I2C) |
| 71204e95 PF |
112 | bus_i2c_init(i2c_index, speed, slave_addr, force_idle_bus, p); |
| 113 | #endif | |
| edbf8b4f SG |
114 | |
| 115 | return 0; | |
| 116 | ||
| 117 | err_idle: | |
| 118 | err_clk: | |
| c6f3f323 | 119 | gpio_free(p->scl.gp); |
| cd3c5896 | 120 | err_req: |
| c6f3f323 | 121 | gpio_free(p->sda.gp); |
| c6f3f323 | 122 | |
| edbf8b4f | 123 | return ret; |
| cc54a0f7 | 124 | } |