Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 1 | /* |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 2 | * i2c driver for Freescale i.MX series |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 3 | * |
| 4 | * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de> |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 5 | * (c) 2011 Marek Vasut <marek.vasut@gmail.com> |
| 6 | * |
| 7 | * Based on i2c-imx.c from linux kernel: |
| 8 | * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de> |
| 9 | * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de> |
| 10 | * Copyright (C) 2007 RightHand Technologies, Inc. |
| 11 | * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt> |
| 12 | * |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 13 | * |
Wolfgang Denk | d79de1d | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 14 | * SPDX-License-Identifier: GPL-2.0+ |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 15 | */ |
| 16 | |
| 17 | #include <common.h> |
Liu Hui-R64343 | 447beb1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 18 | #include <asm/arch/clock.h> |
Stefano Babic | 78129d9 | 2011-03-14 15:43:56 +0100 | [diff] [blame] | 19 | #include <asm/arch/imx-regs.h> |
Troy Kisky | 752ac8f | 2012-07-19 08:18:04 +0000 | [diff] [blame] | 20 | #include <asm/errno.h> |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 21 | #include <asm/imx-common/mxc_i2c.h> |
Troy Kisky | 2254b7f | 2012-07-19 08:18:03 +0000 | [diff] [blame] | 22 | #include <asm/io.h> |
Marek Vasut | 5f1291e | 2011-10-26 00:05:44 +0000 | [diff] [blame] | 23 | #include <i2c.h> |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 24 | #include <watchdog.h> |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 25 | #include <dm.h> |
| 26 | #include <fdtdec.h> |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 27 | |
York Sun | a4c0266 | 2014-02-10 14:02:52 -0800 | [diff] [blame] | 28 | DECLARE_GLOBAL_DATA_PTR; |
| 29 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 30 | #define I2C_QUIRK_FLAG (1 << 0) |
| 31 | |
| 32 | #define IMX_I2C_REGSHIFT 2 |
| 33 | #define VF610_I2C_REGSHIFT 0 |
| 34 | /* Register index */ |
| 35 | #define IADR 0 |
| 36 | #define IFDR 1 |
| 37 | #define I2CR 2 |
| 38 | #define I2SR 3 |
| 39 | #define I2DR 4 |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 40 | |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 41 | #define I2CR_IIEN (1 << 6) |
| 42 | #define I2CR_MSTA (1 << 5) |
| 43 | #define I2CR_MTX (1 << 4) |
| 44 | #define I2CR_TX_NO_AK (1 << 3) |
| 45 | #define I2CR_RSTA (1 << 2) |
| 46 | |
| 47 | #define I2SR_ICF (1 << 7) |
| 48 | #define I2SR_IBB (1 << 5) |
Troy Kisky | 8ff683a | 2012-07-19 08:18:15 +0000 | [diff] [blame] | 49 | #define I2SR_IAL (1 << 4) |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 50 | #define I2SR_IIF (1 << 1) |
| 51 | #define I2SR_RX_NO_AK (1 << 0) |
| 52 | |
Alison Wang | cf50800 | 2013-06-17 15:30:39 +0800 | [diff] [blame] | 53 | #ifdef I2C_QUIRK_REG |
| 54 | #define I2CR_IEN (0 << 7) |
| 55 | #define I2CR_IDIS (1 << 7) |
| 56 | #define I2SR_IIF_CLEAR (1 << 1) |
| 57 | #else |
| 58 | #define I2CR_IEN (1 << 7) |
| 59 | #define I2CR_IDIS (0 << 7) |
| 60 | #define I2SR_IIF_CLEAR (0 << 1) |
| 61 | #endif |
| 62 | |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 63 | #if defined(CONFIG_HARD_I2C) && !defined(CONFIG_SYS_I2C_BASE) |
Troy Kisky | 8462c63 | 2012-04-24 17:33:25 +0000 | [diff] [blame] | 64 | #error "define CONFIG_SYS_I2C_BASE to use the mxc_i2c driver" |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 65 | #endif |
| 66 | |
Alison Wang | cf50800 | 2013-06-17 15:30:39 +0800 | [diff] [blame] | 67 | #ifdef I2C_QUIRK_REG |
| 68 | static u16 i2c_clk_div[60][2] = { |
| 69 | { 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 }, |
| 70 | { 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 }, |
| 71 | { 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D }, |
| 72 | { 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 }, |
| 73 | { 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 }, |
| 74 | { 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 }, |
| 75 | { 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 }, |
| 76 | { 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 }, |
| 77 | { 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 }, |
| 78 | { 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B }, |
| 79 | { 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 }, |
| 80 | { 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 }, |
| 81 | { 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B }, |
| 82 | { 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A }, |
| 83 | { 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E }, |
| 84 | }; |
| 85 | #else |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 86 | static u16 i2c_clk_div[50][2] = { |
| 87 | { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 }, |
| 88 | { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 }, |
| 89 | { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 }, |
| 90 | { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B }, |
| 91 | { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A }, |
| 92 | { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 }, |
| 93 | { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 }, |
| 94 | { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 }, |
| 95 | { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 }, |
| 96 | { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B }, |
| 97 | { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E }, |
| 98 | { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D }, |
| 99 | { 3072, 0x1E }, { 3840, 0x1F } |
| 100 | }; |
Alison Wang | cf50800 | 2013-06-17 15:30:39 +0800 | [diff] [blame] | 101 | #endif |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 102 | |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 103 | #ifndef CONFIG_SYS_MXC_I2C1_SPEED |
| 104 | #define CONFIG_SYS_MXC_I2C1_SPEED 100000 |
| 105 | #endif |
| 106 | #ifndef CONFIG_SYS_MXC_I2C2_SPEED |
| 107 | #define CONFIG_SYS_MXC_I2C2_SPEED 100000 |
| 108 | #endif |
| 109 | #ifndef CONFIG_SYS_MXC_I2C3_SPEED |
| 110 | #define CONFIG_SYS_MXC_I2C3_SPEED 100000 |
| 111 | #endif |
York Sun | f1a5216 | 2015-03-20 10:20:40 -0700 | [diff] [blame] | 112 | #ifndef CONFIG_SYS_MXC_I2C4_SPEED |
| 113 | #define CONFIG_SYS_MXC_I2C4_SPEED 100000 |
| 114 | #endif |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 115 | |
| 116 | #ifndef CONFIG_SYS_MXC_I2C1_SLAVE |
| 117 | #define CONFIG_SYS_MXC_I2C1_SLAVE 0 |
| 118 | #endif |
| 119 | #ifndef CONFIG_SYS_MXC_I2C2_SLAVE |
| 120 | #define CONFIG_SYS_MXC_I2C2_SLAVE 0 |
| 121 | #endif |
| 122 | #ifndef CONFIG_SYS_MXC_I2C3_SLAVE |
| 123 | #define CONFIG_SYS_MXC_I2C3_SLAVE 0 |
| 124 | #endif |
York Sun | f1a5216 | 2015-03-20 10:20:40 -0700 | [diff] [blame] | 125 | #ifndef CONFIG_SYS_MXC_I2C4_SLAVE |
| 126 | #define CONFIG_SYS_MXC_I2C4_SLAVE 0 |
| 127 | #endif |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 128 | |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 129 | /* |
| 130 | * Calculate and set proper clock divider |
| 131 | */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 132 | static uint8_t i2c_imx_get_clk(struct mxc_i2c_bus *i2c_bus, unsigned int rate) |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 133 | { |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 134 | unsigned int i2c_clk_rate; |
| 135 | unsigned int div; |
Marek Vasut | 5f1291e | 2011-10-26 00:05:44 +0000 | [diff] [blame] | 136 | u8 clk_div; |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 137 | |
Liu Hui-R64343 | 447beb1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 138 | #if defined(CONFIG_MX31) |
Stefano Babic | 2212172 | 2011-01-20 07:50:44 +0000 | [diff] [blame] | 139 | struct clock_control_regs *sc_regs = |
| 140 | (struct clock_control_regs *)CCM_BASE; |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 141 | |
Guennadi Liakhovetski | 3314fc6 | 2009-02-13 09:23:36 +0100 | [diff] [blame] | 142 | /* start the required I2C clock */ |
Troy Kisky | 8462c63 | 2012-04-24 17:33:25 +0000 | [diff] [blame] | 143 | writel(readl(&sc_regs->cgr0) | (3 << CONFIG_SYS_I2C_CLK_OFFSET), |
Stefano Babic | 2212172 | 2011-01-20 07:50:44 +0000 | [diff] [blame] | 144 | &sc_regs->cgr0); |
Liu Hui-R64343 | 447beb1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 145 | #endif |
Guennadi Liakhovetski | 3314fc6 | 2009-02-13 09:23:36 +0100 | [diff] [blame] | 146 | |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 147 | /* Divider value calculation */ |
Matthias Weisser | 99ba342 | 2012-09-24 02:46:53 +0000 | [diff] [blame] | 148 | i2c_clk_rate = mxc_get_clock(MXC_I2C_CLK); |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 149 | div = (i2c_clk_rate + rate - 1) / rate; |
| 150 | if (div < i2c_clk_div[0][0]) |
Marek Vasut | 4f27444 | 2011-09-27 06:34:11 +0000 | [diff] [blame] | 151 | clk_div = 0; |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 152 | else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0]) |
Marek Vasut | 4f27444 | 2011-09-27 06:34:11 +0000 | [diff] [blame] | 153 | clk_div = ARRAY_SIZE(i2c_clk_div) - 1; |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 154 | else |
Marek Vasut | 4f27444 | 2011-09-27 06:34:11 +0000 | [diff] [blame] | 155 | for (clk_div = 0; i2c_clk_div[clk_div][0] < div; clk_div++) |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 156 | ; |
| 157 | |
| 158 | /* Store divider value */ |
Marek Vasut | 5f1291e | 2011-10-26 00:05:44 +0000 | [diff] [blame] | 159 | return clk_div; |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 160 | } |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 161 | |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 162 | /* |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 163 | * Set I2C Bus speed |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 164 | */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 165 | static int bus_i2c_set_bus_speed(struct mxc_i2c_bus *i2c_bus, int speed) |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 166 | { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 167 | ulong base = i2c_bus->base; |
| 168 | bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false; |
| 169 | u8 clk_idx = i2c_imx_get_clk(i2c_bus, speed); |
Marek Vasut | 5f1291e | 2011-10-26 00:05:44 +0000 | [diff] [blame] | 170 | u8 idx = i2c_clk_div[clk_idx][1]; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 171 | int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; |
Marek Vasut | 5f1291e | 2011-10-26 00:05:44 +0000 | [diff] [blame] | 172 | |
Heiko Schocher | 24ebcf2 | 2015-05-18 10:58:12 +0200 | [diff] [blame] | 173 | if (!base) |
| 174 | return -ENODEV; |
| 175 | |
Marek Vasut | 5f1291e | 2011-10-26 00:05:44 +0000 | [diff] [blame] | 176 | /* Store divider value */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 177 | writeb(idx, base + (IFDR << reg_shift)); |
Marek Vasut | 5f1291e | 2011-10-26 00:05:44 +0000 | [diff] [blame] | 178 | |
Troy Kisky | e6fa4d7 | 2012-07-19 08:18:12 +0000 | [diff] [blame] | 179 | /* Reset module */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 180 | writeb(I2CR_IDIS, base + (I2CR << reg_shift)); |
| 181 | writeb(0, base + (I2SR << reg_shift)); |
Marek Vasut | 4f27444 | 2011-09-27 06:34:11 +0000 | [diff] [blame] | 182 | return 0; |
| 183 | } |
| 184 | |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 185 | #define ST_BUS_IDLE (0 | (I2SR_IBB << 8)) |
| 186 | #define ST_BUS_BUSY (I2SR_IBB | (I2SR_IBB << 8)) |
| 187 | #define ST_IIF (I2SR_IIF | (I2SR_IIF << 8)) |
Stefano Babic | 848bb99 | 2011-01-20 07:51:31 +0000 | [diff] [blame] | 188 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 189 | static int wait_for_sr_state(struct mxc_i2c_bus *i2c_bus, unsigned state) |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 190 | { |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 191 | unsigned sr; |
| 192 | ulong elapsed; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 193 | bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false; |
| 194 | int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; |
| 195 | ulong base = i2c_bus->base; |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 196 | ulong start_time = get_timer(0); |
| 197 | for (;;) { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 198 | sr = readb(base + (I2SR << reg_shift)); |
Troy Kisky | 8ff683a | 2012-07-19 08:18:15 +0000 | [diff] [blame] | 199 | if (sr & I2SR_IAL) { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 200 | if (quirk) |
| 201 | writeb(sr | I2SR_IAL, base + |
| 202 | (I2SR << reg_shift)); |
| 203 | else |
| 204 | writeb(sr & ~I2SR_IAL, base + |
| 205 | (I2SR << reg_shift)); |
Troy Kisky | 8ff683a | 2012-07-19 08:18:15 +0000 | [diff] [blame] | 206 | printf("%s: Arbitration lost sr=%x cr=%x state=%x\n", |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 207 | __func__, sr, readb(base + (I2CR << reg_shift)), |
| 208 | state); |
Troy Kisky | 8ff683a | 2012-07-19 08:18:15 +0000 | [diff] [blame] | 209 | return -ERESTART; |
| 210 | } |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 211 | if ((sr & (state >> 8)) == (unsigned char)state) |
| 212 | return sr; |
| 213 | WATCHDOG_RESET(); |
| 214 | elapsed = get_timer(start_time); |
| 215 | if (elapsed > (CONFIG_SYS_HZ / 10)) /* .1 seconds */ |
| 216 | break; |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 217 | } |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 218 | printf("%s: failed sr=%x cr=%x state=%x\n", __func__, |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 219 | sr, readb(base + (I2CR << reg_shift)), state); |
Troy Kisky | 752ac8f | 2012-07-19 08:18:04 +0000 | [diff] [blame] | 220 | return -ETIMEDOUT; |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 221 | } |
| 222 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 223 | static int tx_byte(struct mxc_i2c_bus *i2c_bus, u8 byte) |
Stefano Babic | 848bb99 | 2011-01-20 07:51:31 +0000 | [diff] [blame] | 224 | { |
Troy Kisky | 752ac8f | 2012-07-19 08:18:04 +0000 | [diff] [blame] | 225 | int ret; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 226 | int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? |
| 227 | VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; |
| 228 | ulong base = i2c_bus->base; |
Stefano Babic | 848bb99 | 2011-01-20 07:51:31 +0000 | [diff] [blame] | 229 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 230 | writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift)); |
| 231 | writeb(byte, base + (I2DR << reg_shift)); |
| 232 | |
| 233 | ret = wait_for_sr_state(i2c_bus, ST_IIF); |
Troy Kisky | 752ac8f | 2012-07-19 08:18:04 +0000 | [diff] [blame] | 234 | if (ret < 0) |
| 235 | return ret; |
Troy Kisky | 752ac8f | 2012-07-19 08:18:04 +0000 | [diff] [blame] | 236 | if (ret & I2SR_RX_NO_AK) |
| 237 | return -ENODEV; |
| 238 | return 0; |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 239 | } |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 240 | |
| 241 | /* |
| 242 | * Stub implementations for outer i2c slave operations. |
| 243 | */ |
| 244 | void __i2c_force_reset_slave(void) |
| 245 | { |
| 246 | } |
| 247 | void i2c_force_reset_slave(void) |
| 248 | __attribute__((weak, alias("__i2c_force_reset_slave"))); |
Stefano Babic | 848bb99 | 2011-01-20 07:51:31 +0000 | [diff] [blame] | 249 | |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 250 | /* |
Troy Kisky | fef163f | 2012-07-19 08:18:13 +0000 | [diff] [blame] | 251 | * Stop I2C transaction |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 252 | */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 253 | static void i2c_imx_stop(struct mxc_i2c_bus *i2c_bus) |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 254 | { |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 255 | int ret; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 256 | int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? |
| 257 | VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; |
| 258 | ulong base = i2c_bus->base; |
| 259 | unsigned int temp = readb(base + (I2CR << reg_shift)); |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 260 | |
Troy Kisky | 1ac1e45 | 2012-07-19 08:18:02 +0000 | [diff] [blame] | 261 | temp &= ~(I2CR_MSTA | I2CR_MTX); |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 262 | writeb(temp, base + (I2CR << reg_shift)); |
| 263 | ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE); |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 264 | if (ret < 0) |
| 265 | printf("%s:trigger stop failed\n", __func__); |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 266 | } |
| 267 | |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 268 | /* |
Troy Kisky | 14db6f2 | 2012-07-19 08:18:06 +0000 | [diff] [blame] | 269 | * Send start signal, chip address and |
| 270 | * write register address |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 271 | */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 272 | static int i2c_init_transfer_(struct mxc_i2c_bus *i2c_bus, u8 chip, |
| 273 | u32 addr, int alen) |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 274 | { |
Troy Kisky | a974bcc | 2012-07-19 08:18:11 +0000 | [diff] [blame] | 275 | unsigned int temp; |
| 276 | int ret; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 277 | bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false; |
| 278 | ulong base = i2c_bus->base; |
| 279 | int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; |
| 280 | |
| 281 | /* Reset i2c slave */ |
| 282 | i2c_force_reset_slave(); |
Troy Kisky | a974bcc | 2012-07-19 08:18:11 +0000 | [diff] [blame] | 283 | |
| 284 | /* Enable I2C controller */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 285 | if (quirk) |
| 286 | ret = readb(base + (I2CR << reg_shift)) & I2CR_IDIS; |
| 287 | else |
| 288 | ret = !(readb(base + (I2CR << reg_shift)) & I2CR_IEN); |
| 289 | |
| 290 | if (ret) { |
| 291 | writeb(I2CR_IEN, base + (I2CR << reg_shift)); |
Troy Kisky | fef163f | 2012-07-19 08:18:13 +0000 | [diff] [blame] | 292 | /* Wait for controller to be stable */ |
| 293 | udelay(50); |
| 294 | } |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 295 | |
| 296 | if (readb(base + (IADR << reg_shift)) == (chip << 1)) |
| 297 | writeb((chip << 1) ^ 2, base + (IADR << reg_shift)); |
| 298 | writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift)); |
| 299 | ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE); |
Troy Kisky | fef163f | 2012-07-19 08:18:13 +0000 | [diff] [blame] | 300 | if (ret < 0) |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 301 | return ret; |
Troy Kisky | a974bcc | 2012-07-19 08:18:11 +0000 | [diff] [blame] | 302 | |
| 303 | /* Start I2C transaction */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 304 | temp = readb(base + (I2CR << reg_shift)); |
Troy Kisky | a974bcc | 2012-07-19 08:18:11 +0000 | [diff] [blame] | 305 | temp |= I2CR_MSTA; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 306 | writeb(temp, base + (I2CR << reg_shift)); |
Troy Kisky | a974bcc | 2012-07-19 08:18:11 +0000 | [diff] [blame] | 307 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 308 | ret = wait_for_sr_state(i2c_bus, ST_BUS_BUSY); |
Troy Kisky | a974bcc | 2012-07-19 08:18:11 +0000 | [diff] [blame] | 309 | if (ret < 0) |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 310 | return ret; |
Troy Kisky | 14db6f2 | 2012-07-19 08:18:06 +0000 | [diff] [blame] | 311 | |
Troy Kisky | a974bcc | 2012-07-19 08:18:11 +0000 | [diff] [blame] | 312 | temp |= I2CR_MTX | I2CR_TX_NO_AK; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 313 | writeb(temp, base + (I2CR << reg_shift)); |
Troy Kisky | a974bcc | 2012-07-19 08:18:11 +0000 | [diff] [blame] | 314 | |
Troy Kisky | 14db6f2 | 2012-07-19 08:18:06 +0000 | [diff] [blame] | 315 | /* write slave address */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 316 | ret = tx_byte(i2c_bus, chip << 1); |
Troy Kisky | 14db6f2 | 2012-07-19 08:18:06 +0000 | [diff] [blame] | 317 | if (ret < 0) |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 318 | return ret; |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 319 | |
Marek Vasut | 5f1291e | 2011-10-26 00:05:44 +0000 | [diff] [blame] | 320 | while (alen--) { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 321 | ret = tx_byte(i2c_bus, (addr >> (alen * 8)) & 0xff); |
Troy Kisky | 752ac8f | 2012-07-19 08:18:04 +0000 | [diff] [blame] | 322 | if (ret < 0) |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 323 | return ret; |
Stefano Babic | 848bb99 | 2011-01-20 07:51:31 +0000 | [diff] [blame] | 324 | } |
Troy Kisky | 14db6f2 | 2012-07-19 08:18:06 +0000 | [diff] [blame] | 325 | return 0; |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 326 | } |
| 327 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 328 | #ifndef CONFIG_DM_I2C |
| 329 | int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus) |
| 330 | { |
| 331 | if (i2c_bus && i2c_bus->idle_bus_fn) |
| 332 | return i2c_bus->idle_bus_fn(i2c_bus->idle_bus_data); |
| 333 | return 0; |
| 334 | } |
| 335 | #else |
| 336 | /* |
| 337 | * Since pinmux is not supported, implement a weak function here. |
| 338 | * You can implement your i2c_bus_idle in board file. When pinctrl |
| 339 | * is supported, this can be removed. |
| 340 | */ |
| 341 | int __i2c_idle_bus(struct mxc_i2c_bus *i2c_bus) |
| 342 | { |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus) |
| 347 | __attribute__((weak, alias("__i2c_idle_bus"))); |
| 348 | #endif |
Troy Kisky | a23ab22 | 2012-07-19 08:18:19 +0000 | [diff] [blame] | 349 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 350 | static int i2c_init_transfer(struct mxc_i2c_bus *i2c_bus, u8 chip, |
| 351 | u32 addr, int alen) |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 352 | { |
| 353 | int retry; |
| 354 | int ret; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 355 | int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? |
| 356 | VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; |
Heiko Schocher | 24ebcf2 | 2015-05-18 10:58:12 +0200 | [diff] [blame] | 357 | |
| 358 | if (!i2c_bus->base) |
| 359 | return -ENODEV; |
| 360 | |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 361 | for (retry = 0; retry < 3; retry++) { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 362 | ret = i2c_init_transfer_(i2c_bus, chip, addr, alen); |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 363 | if (ret >= 0) |
| 364 | return 0; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 365 | i2c_imx_stop(i2c_bus); |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 366 | if (ret == -ENODEV) |
| 367 | return ret; |
| 368 | |
| 369 | printf("%s: failed for chip 0x%x retry=%d\n", __func__, chip, |
| 370 | retry); |
| 371 | if (ret != -ERESTART) |
Alison Wang | cf50800 | 2013-06-17 15:30:39 +0800 | [diff] [blame] | 372 | /* Disable controller */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 373 | writeb(I2CR_IDIS, i2c_bus->base + (I2CR << reg_shift)); |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 374 | udelay(100); |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 375 | if (i2c_idle_bus(i2c_bus) < 0) |
Troy Kisky | a23ab22 | 2012-07-19 08:18:19 +0000 | [diff] [blame] | 376 | break; |
Troy Kisky | eca037a | 2012-07-19 08:18:16 +0000 | [diff] [blame] | 377 | } |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 378 | printf("%s: give up i2c_regs=0x%lx\n", __func__, i2c_bus->base); |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 379 | return ret; |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 380 | } |
| 381 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 382 | |
| 383 | static int i2c_write_data(struct mxc_i2c_bus *i2c_bus, u8 chip, const u8 *buf, |
| 384 | int len) |
| 385 | { |
| 386 | int i, ret = 0; |
| 387 | |
| 388 | debug("i2c_write_data: chip=0x%x, len=0x%x\n", chip, len); |
| 389 | debug("write_data: "); |
| 390 | /* use rc for counter */ |
| 391 | for (i = 0; i < len; ++i) |
| 392 | debug(" 0x%02x", buf[i]); |
| 393 | debug("\n"); |
| 394 | |
| 395 | for (i = 0; i < len; i++) { |
| 396 | ret = tx_byte(i2c_bus, buf[i]); |
| 397 | if (ret < 0) { |
| 398 | debug("i2c_write_data(): rc=%d\n", ret); |
| 399 | break; |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | return ret; |
| 404 | } |
| 405 | |
| 406 | static int i2c_read_data(struct mxc_i2c_bus *i2c_bus, uchar chip, uchar *buf, |
| 407 | int len) |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 408 | { |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 409 | int ret; |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 410 | unsigned int temp; |
| 411 | int i; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 412 | int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? |
| 413 | VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; |
| 414 | ulong base = i2c_bus->base; |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 415 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 416 | debug("i2c_read_data: chip=0x%x, len=0x%x\n", chip, len); |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 417 | |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 418 | /* setup bus to read data */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 419 | temp = readb(base + (I2CR << reg_shift)); |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 420 | temp &= ~(I2CR_MTX | I2CR_TX_NO_AK); |
| 421 | if (len == 1) |
| 422 | temp |= I2CR_TX_NO_AK; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 423 | writeb(temp, base + (I2CR << reg_shift)); |
| 424 | writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift)); |
| 425 | /* dummy read to clear ICF */ |
| 426 | readb(base + (I2DR << reg_shift)); |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 427 | |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 428 | /* read data */ |
| 429 | for (i = 0; i < len; i++) { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 430 | ret = wait_for_sr_state(i2c_bus, ST_IIF); |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 431 | if (ret < 0) { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 432 | debug("i2c_read_data(): ret=%d\n", ret); |
| 433 | i2c_imx_stop(i2c_bus); |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 434 | return ret; |
Troy Kisky | 0ce898d | 2012-07-19 08:18:07 +0000 | [diff] [blame] | 435 | } |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 436 | |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 437 | /* |
| 438 | * It must generate STOP before read I2DR to prevent |
| 439 | * controller from generating another clock cycle |
| 440 | */ |
| 441 | if (i == (len - 1)) { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 442 | i2c_imx_stop(i2c_bus); |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 443 | } else if (i == (len - 2)) { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 444 | temp = readb(base + (I2CR << reg_shift)); |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 445 | temp |= I2CR_TX_NO_AK; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 446 | writeb(temp, base + (I2CR << reg_shift)); |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 447 | } |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 448 | writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift)); |
| 449 | buf[i] = readb(base + (I2DR << reg_shift)); |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 450 | } |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 451 | |
| 452 | /* reuse ret for counter*/ |
| 453 | for (ret = 0; ret < len; ++ret) |
| 454 | debug(" 0x%02x", buf[ret]); |
| 455 | debug("\n"); |
| 456 | |
| 457 | i2c_imx_stop(i2c_bus); |
Troy Kisky | f024a3b | 2012-07-19 08:18:09 +0000 | [diff] [blame] | 458 | return 0; |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 459 | } |
| 460 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 461 | #ifndef CONFIG_DM_I2C |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 462 | /* |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 463 | * Read data from I2C device |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 464 | */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 465 | static int bus_i2c_read(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr, |
| 466 | int alen, u8 *buf, int len) |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 467 | { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 468 | int ret = 0; |
| 469 | u32 temp; |
| 470 | int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? |
| 471 | VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; |
| 472 | ulong base = i2c_bus->base; |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 473 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 474 | ret = i2c_init_transfer(i2c_bus, chip, addr, alen); |
Troy Kisky | 752ac8f | 2012-07-19 08:18:04 +0000 | [diff] [blame] | 475 | if (ret < 0) |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 476 | return ret; |
Sascha Hauer | 15ea70f | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 477 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 478 | temp = readb(base + (I2CR << reg_shift)); |
| 479 | temp |= I2CR_RSTA; |
| 480 | writeb(temp, base + (I2CR << reg_shift)); |
| 481 | |
| 482 | ret = tx_byte(i2c_bus, (chip << 1) | 1); |
| 483 | if (ret < 0) { |
| 484 | i2c_imx_stop(i2c_bus); |
| 485 | return ret; |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 486 | } |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 487 | |
| 488 | ret = i2c_read_data(i2c_bus, chip, buf, len); |
| 489 | |
| 490 | i2c_imx_stop(i2c_bus); |
| 491 | return ret; |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * Write data to I2C device |
| 496 | */ |
| 497 | static int bus_i2c_write(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr, |
| 498 | int alen, const u8 *buf, int len) |
| 499 | { |
| 500 | int ret = 0; |
| 501 | |
| 502 | ret = i2c_init_transfer(i2c_bus, chip, addr, alen); |
| 503 | if (ret < 0) |
| 504 | return ret; |
| 505 | |
| 506 | ret = i2c_write_data(i2c_bus, chip, buf, len); |
| 507 | |
| 508 | i2c_imx_stop(i2c_bus); |
| 509 | |
Marek Vasut | 94cb842 | 2011-09-22 09:22:12 +0000 | [diff] [blame] | 510 | return ret; |
| 511 | } |
Troy Kisky | 321a42b | 2012-07-19 08:18:08 +0000 | [diff] [blame] | 512 | |
Heiko Schocher | 24ebcf2 | 2015-05-18 10:58:12 +0200 | [diff] [blame] | 513 | #if !defined(I2C2_BASE_ADDR) |
| 514 | #define I2C2_BASE_ADDR 0 |
Heiko Schocher | 5c4b1e9 | 2015-05-18 10:56:24 +0200 | [diff] [blame] | 515 | #endif |
Heiko Schocher | 24ebcf2 | 2015-05-18 10:58:12 +0200 | [diff] [blame] | 516 | |
| 517 | #if !defined(I2C3_BASE_ADDR) |
| 518 | #define I2C3_BASE_ADDR 0 |
| 519 | #endif |
| 520 | |
| 521 | #if !defined(I2C4_BASE_ADDR) |
| 522 | #define I2C4_BASE_ADDR 0 |
| 523 | #endif |
| 524 | |
| 525 | static struct mxc_i2c_bus mxc_i2c_buses[] = { |
Albert ARIBAUD \(3ADEV\) | 40281ba | 2015-06-19 14:18:29 +0200 | [diff] [blame] | 526 | #if defined(CONFIG_LS102XA) || defined(CONFIG_FSL_LSCH3) || \ |
| 527 | defined(CONFIG_VF610) |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 528 | { 0, I2C1_BASE_ADDR, I2C_QUIRK_FLAG }, |
| 529 | { 1, I2C2_BASE_ADDR, I2C_QUIRK_FLAG }, |
| 530 | { 2, I2C3_BASE_ADDR, I2C_QUIRK_FLAG }, |
| 531 | { 3, I2C4_BASE_ADDR, I2C_QUIRK_FLAG }, |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 532 | #else |
Heiko Schocher | 24ebcf2 | 2015-05-18 10:58:12 +0200 | [diff] [blame] | 533 | { 0, I2C1_BASE_ADDR, 0 }, |
| 534 | { 1, I2C2_BASE_ADDR, 0 }, |
| 535 | { 2, I2C3_BASE_ADDR, 0 }, |
| 536 | { 3, I2C4_BASE_ADDR, 0 }, |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 537 | #endif |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 538 | }; |
| 539 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 540 | struct mxc_i2c_bus *i2c_get_base(struct i2c_adapter *adap) |
Troy Kisky | a23ab22 | 2012-07-19 08:18:19 +0000 | [diff] [blame] | 541 | { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 542 | return &mxc_i2c_buses[adap->hwadapnr]; |
Troy Kisky | a23ab22 | 2012-07-19 08:18:19 +0000 | [diff] [blame] | 543 | } |
Troy Kisky | b6f9826 | 2012-07-19 08:18:20 +0000 | [diff] [blame] | 544 | |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 545 | static int mxc_i2c_read(struct i2c_adapter *adap, uint8_t chip, |
| 546 | uint addr, int alen, uint8_t *buffer, |
| 547 | int len) |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 548 | { |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 549 | return bus_i2c_read(i2c_get_base(adap), chip, addr, alen, buffer, len); |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 550 | } |
| 551 | |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 552 | static int mxc_i2c_write(struct i2c_adapter *adap, uint8_t chip, |
| 553 | uint addr, int alen, uint8_t *buffer, |
| 554 | int len) |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 555 | { |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 556 | return bus_i2c_write(i2c_get_base(adap), chip, addr, alen, buffer, len); |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 557 | } |
| 558 | |
| 559 | /* |
Troy Kisky | 321a42b | 2012-07-19 08:18:08 +0000 | [diff] [blame] | 560 | * Test if a chip at a given address responds (probe the chip) |
| 561 | */ |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 562 | static int mxc_i2c_probe(struct i2c_adapter *adap, uint8_t chip) |
Troy Kisky | 321a42b | 2012-07-19 08:18:08 +0000 | [diff] [blame] | 563 | { |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 564 | return bus_i2c_write(i2c_get_base(adap), chip, 0, 0, NULL, 0); |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 565 | } |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 566 | |
| 567 | int __enable_i2c_clk(unsigned char enable, unsigned i2c_num) |
| 568 | { |
| 569 | return 1; |
| 570 | } |
| 571 | int enable_i2c_clk(unsigned char enable, unsigned i2c_num) |
| 572 | __attribute__((weak, alias("__enable_i2c_clk"))); |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 573 | |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 574 | void bus_i2c_init(int index, int speed, int unused, |
| 575 | int (*idle_bus_fn)(void *p), void *idle_bus_data) |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 576 | { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 577 | int ret; |
| 578 | |
| 579 | if (index >= ARRAY_SIZE(mxc_i2c_buses)) { |
| 580 | debug("Error i2c index\n"); |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 581 | return; |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 582 | } |
| 583 | |
| 584 | mxc_i2c_buses[index].idle_bus_fn = idle_bus_fn; |
| 585 | mxc_i2c_buses[index].idle_bus_data = idle_bus_data; |
| 586 | |
| 587 | ret = enable_i2c_clk(1, index); |
| 588 | if (ret < 0) { |
| 589 | debug("I2C-%d clk fail to enable.\n", index); |
| 590 | return; |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 591 | } |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 592 | |
| 593 | bus_i2c_set_bus_speed(&mxc_i2c_buses[index], speed); |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 594 | } |
| 595 | |
| 596 | /* |
| 597 | * Init I2C Bus |
| 598 | */ |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 599 | static void mxc_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr) |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 600 | { |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 601 | bus_i2c_init(adap->hwadapnr, speed, slaveaddr, NULL, NULL); |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Set I2C Speed |
| 606 | */ |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 607 | static u32 mxc_i2c_set_bus_speed(struct i2c_adapter *adap, uint speed) |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 608 | { |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 609 | return bus_i2c_set_bus_speed(i2c_get_base(adap), speed); |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 610 | } |
| 611 | |
| 612 | /* |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 613 | * Register mxc i2c adapters |
Troy Kisky | ae44760 | 2012-07-19 08:18:18 +0000 | [diff] [blame] | 614 | */ |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 615 | U_BOOT_I2C_ADAP_COMPLETE(mxc0, mxc_i2c_init, mxc_i2c_probe, |
| 616 | mxc_i2c_read, mxc_i2c_write, |
| 617 | mxc_i2c_set_bus_speed, |
| 618 | CONFIG_SYS_MXC_I2C1_SPEED, |
| 619 | CONFIG_SYS_MXC_I2C1_SLAVE, 0) |
| 620 | U_BOOT_I2C_ADAP_COMPLETE(mxc1, mxc_i2c_init, mxc_i2c_probe, |
| 621 | mxc_i2c_read, mxc_i2c_write, |
| 622 | mxc_i2c_set_bus_speed, |
| 623 | CONFIG_SYS_MXC_I2C2_SPEED, |
| 624 | CONFIG_SYS_MXC_I2C2_SLAVE, 1) |
York Sun | f1a5216 | 2015-03-20 10:20:40 -0700 | [diff] [blame] | 625 | #ifdef CONFIG_SYS_I2C_MXC_I2C3 |
trem | a49f40a | 2013-09-21 18:13:35 +0200 | [diff] [blame] | 626 | U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe, |
| 627 | mxc_i2c_read, mxc_i2c_write, |
| 628 | mxc_i2c_set_bus_speed, |
| 629 | CONFIG_SYS_MXC_I2C3_SPEED, |
| 630 | CONFIG_SYS_MXC_I2C3_SLAVE, 2) |
| 631 | #endif |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 632 | |
York Sun | f1a5216 | 2015-03-20 10:20:40 -0700 | [diff] [blame] | 633 | #ifdef CONFIG_SYS_I2C_MXC_I2C4 |
| 634 | U_BOOT_I2C_ADAP_COMPLETE(mxc3, mxc_i2c_init, mxc_i2c_probe, |
| 635 | mxc_i2c_read, mxc_i2c_write, |
| 636 | mxc_i2c_set_bus_speed, |
| 637 | CONFIG_SYS_MXC_I2C4_SPEED, |
| 638 | CONFIG_SYS_MXC_I2C4_SLAVE, 3) |
| 639 | #endif |
Peng Fan | 8262cb1 | 2015-05-15 07:29:12 +0800 | [diff] [blame] | 640 | |
| 641 | #else |
| 642 | |
| 643 | static int mxc_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) |
| 644 | { |
| 645 | struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus); |
| 646 | |
| 647 | return bus_i2c_set_bus_speed(i2c_bus, speed); |
| 648 | } |
| 649 | |
| 650 | static int mxc_i2c_probe(struct udevice *bus) |
| 651 | { |
| 652 | struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus); |
| 653 | fdt_addr_t addr; |
| 654 | int ret; |
| 655 | |
| 656 | i2c_bus->driver_data = dev_get_driver_data(bus); |
| 657 | |
| 658 | addr = dev_get_addr(bus); |
| 659 | if (addr == FDT_ADDR_T_NONE) |
| 660 | return -ENODEV; |
| 661 | |
| 662 | i2c_bus->base = addr; |
| 663 | i2c_bus->index = bus->seq; |
| 664 | |
| 665 | /* Enable clk */ |
| 666 | ret = enable_i2c_clk(1, bus->seq); |
| 667 | if (ret < 0) |
| 668 | return ret; |
| 669 | |
| 670 | ret = i2c_idle_bus(i2c_bus); |
| 671 | if (ret < 0) { |
| 672 | /* Disable clk */ |
| 673 | enable_i2c_clk(0, bus->seq); |
| 674 | return ret; |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * Pinmux settings are in board file now, until pinmux is supported, |
| 679 | * we can set pinmux here in probe function. |
| 680 | */ |
| 681 | |
| 682 | debug("i2c : controller bus %d at %lu , speed %d: ", |
| 683 | bus->seq, i2c_bus->base, |
| 684 | i2c_bus->speed); |
| 685 | |
| 686 | return 0; |
| 687 | } |
| 688 | |
| 689 | static int mxc_i2c_probe_chip(struct udevice *bus, u32 chip_addr, |
| 690 | u32 chip_flags) |
| 691 | { |
| 692 | int ret; |
| 693 | struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus); |
| 694 | |
| 695 | ret = i2c_init_transfer(i2c_bus, chip_addr, 0, 0); |
| 696 | if (ret < 0) { |
| 697 | debug("%s failed, ret = %d\n", __func__, ret); |
| 698 | return ret; |
| 699 | } |
| 700 | |
| 701 | i2c_imx_stop(i2c_bus); |
| 702 | |
| 703 | return 0; |
| 704 | } |
| 705 | |
| 706 | static int mxc_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) |
| 707 | { |
| 708 | struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus); |
| 709 | int ret = 0; |
| 710 | ulong base = i2c_bus->base; |
| 711 | int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? |
| 712 | VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; |
| 713 | |
| 714 | /* |
| 715 | * Here the 3rd parameter addr and the 4th one alen are set to 0, |
| 716 | * because here we only want to send out chip address. The register |
| 717 | * address is wrapped in msg. |
| 718 | */ |
| 719 | ret = i2c_init_transfer(i2c_bus, msg->addr, 0, 0); |
| 720 | if (ret < 0) { |
| 721 | debug("i2c_init_transfer error: %d\n", ret); |
| 722 | return ret; |
| 723 | } |
| 724 | |
| 725 | for (; nmsgs > 0; nmsgs--, msg++) { |
| 726 | bool next_is_read = nmsgs > 1 && (msg[1].flags & I2C_M_RD); |
| 727 | debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len); |
| 728 | if (msg->flags & I2C_M_RD) |
| 729 | ret = i2c_read_data(i2c_bus, msg->addr, msg->buf, |
| 730 | msg->len); |
| 731 | else { |
| 732 | ret = i2c_write_data(i2c_bus, msg->addr, msg->buf, |
| 733 | msg->len); |
| 734 | if (ret) |
| 735 | break; |
| 736 | if (next_is_read) { |
| 737 | /* Reuse ret */ |
| 738 | ret = readb(base + (I2CR << reg_shift)); |
| 739 | ret |= I2CR_RSTA; |
| 740 | writeb(ret, base + (I2CR << reg_shift)); |
| 741 | |
| 742 | ret = tx_byte(i2c_bus, (msg->addr << 1) | 1); |
| 743 | if (ret < 0) { |
| 744 | i2c_imx_stop(i2c_bus); |
| 745 | break; |
| 746 | } |
| 747 | } |
| 748 | } |
| 749 | } |
| 750 | |
| 751 | if (ret) |
| 752 | debug("i2c_write: error sending\n"); |
| 753 | |
| 754 | i2c_imx_stop(i2c_bus); |
| 755 | |
| 756 | return ret; |
| 757 | } |
| 758 | |
| 759 | static const struct dm_i2c_ops mxc_i2c_ops = { |
| 760 | .xfer = mxc_i2c_xfer, |
| 761 | .probe_chip = mxc_i2c_probe_chip, |
| 762 | .set_bus_speed = mxc_i2c_set_bus_speed, |
| 763 | }; |
| 764 | |
| 765 | static const struct udevice_id mxc_i2c_ids[] = { |
| 766 | { .compatible = "fsl,imx21-i2c", }, |
| 767 | { .compatible = "fsl,vf610-i2c", .data = I2C_QUIRK_FLAG, }, |
| 768 | {} |
| 769 | }; |
| 770 | |
| 771 | U_BOOT_DRIVER(i2c_mxc) = { |
| 772 | .name = "i2c_mxc", |
| 773 | .id = UCLASS_I2C, |
| 774 | .of_match = mxc_i2c_ids, |
| 775 | .probe = mxc_i2c_probe, |
| 776 | .priv_auto_alloc_size = sizeof(struct mxc_i2c_bus), |
| 777 | .ops = &mxc_i2c_ops, |
| 778 | }; |
| 779 | #endif |