huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2014 Rockchip Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 16 | #include <arch/io.h> |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 17 | #include <assert.h> |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 18 | #include <cbfs.h> |
Julius Werner | 7a453eb | 2014-10-20 13:14:55 -0700 | [diff] [blame] | 19 | #include <console/console.h> |
| 20 | #include <delay.h> |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 21 | #include <device/i2c.h> |
Julius Werner | 7a453eb | 2014-10-20 13:14:55 -0700 | [diff] [blame] | 22 | #include <soc/addressmap.h> |
| 23 | #include <soc/grf.h> |
| 24 | #include <soc/soc.h> |
| 25 | #include <soc/i2c.h> |
| 26 | #include <soc/clock.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
huang lin | bbcffd9 | 2014-09-27 12:02:27 +0800 | [diff] [blame] | 29 | |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 30 | #define RETRY_COUNT 3 |
| 31 | /* 100000us = 100ms */ |
| 32 | #define I2C_TIMEOUT_US 100000 |
Daisuke Nojiri | 51de5a8 | 2014-09-18 12:35:09 -0700 | [diff] [blame] | 33 | #define I2C_BUS_MAX 6 |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 34 | #define I2C_NOACK 2 |
| 35 | #define I2C_TIMEOUT 3 |
| 36 | |
| 37 | #define i2c_info(x...) do {if (0) printk(BIOS_DEBUG, x); } while (0) |
| 38 | |
| 39 | struct rk3288_i2c_regs { |
| 40 | u32 i2c_con; |
| 41 | u32 i2c_clkdiv; |
| 42 | u32 i2c_mrxaddr; |
| 43 | u32 i2c_mrxraddr; |
| 44 | u32 i2c_mtxcnt; |
| 45 | u32 i2c_mrxcnt; |
| 46 | u32 i2c_ien; |
| 47 | u32 i2c_ipd; |
| 48 | u32 i2c_fcnt; |
| 49 | u32 reserved0[(0x100 - 0x24) / 4]; |
| 50 | u32 txdata[8]; |
| 51 | u32 reserved1[(0x200 - 0x120) / 4]; |
| 52 | u32 rxdata[8]; |
| 53 | }; |
| 54 | |
| 55 | struct rk3288_i2c_regs *i2c_bus[] = { |
| 56 | (struct rk3288_i2c_regs *)0xff650000, |
| 57 | (struct rk3288_i2c_regs *)0xff140000, |
| 58 | (struct rk3288_i2c_regs *)0xff660000, |
| 59 | (struct rk3288_i2c_regs *)0xff150000, |
| 60 | (struct rk3288_i2c_regs *)0xff160000, |
| 61 | (struct rk3288_i2c_regs *)0xff170000, |
| 62 | }; |
| 63 | |
| 64 | /* Con register bits. */ |
| 65 | #define I2C_ACT2NAK (1<<6) |
| 66 | #define I2C_NAK (1<<5) |
| 67 | #define I2C_STOP (1<<4) |
| 68 | #define I2C_START (1<<3) |
| 69 | #define I2C_MODE_TX (0<<1) |
| 70 | #define I2C_MODE_TRX (1<<1) |
| 71 | #define I2C_MODE_RX (2<<1) |
| 72 | #define I2C_EN (1<<0) |
| 73 | |
| 74 | #define I2C_8BIT (1<<24) |
| 75 | #define I2C_16BIT (3<<24) |
| 76 | #define I2C_24BIT (7<<24) |
| 77 | |
| 78 | /* Mtxcnt register bits. */ |
| 79 | #define I2C_CNT(cnt) ((cnt) & 0x3F) |
| 80 | |
| 81 | #define I2C_NAKRCVI (1<<6) |
| 82 | #define I2C_STOPI (1<<5) |
| 83 | #define I2C_STARTI (1<<4) |
| 84 | #define I2C_MBRFI (1<<3) |
| 85 | #define I2C_MBTFI (1<<2) |
| 86 | #define I2C_BRFI (1<<1) |
| 87 | #define I2C_BTFI (1<<0) |
| 88 | #define I2C_CLEANI 0x7F |
| 89 | |
| 90 | static int i2c_send_start(struct rk3288_i2c_regs *reg_addr) |
| 91 | { |
| 92 | int res = 0; |
| 93 | int timeout = I2C_TIMEOUT_US; |
| 94 | |
| 95 | i2c_info("I2c Start::Send Start bit\n"); |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 96 | write32(®_addr->i2c_ipd, I2C_CLEANI); |
| 97 | write32(®_addr->i2c_con, I2C_EN | I2C_START); |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 98 | while (timeout--) { |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 99 | if (read32(®_addr->i2c_ipd) & I2C_STARTI) |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 100 | break; |
| 101 | udelay(1); |
| 102 | } |
| 103 | |
| 104 | if (timeout <= 0) { |
| 105 | printk(BIOS_ERR, "I2C Start::Send Start Bit Timeout\n"); |
| 106 | res = I2C_TIMEOUT; |
| 107 | } |
| 108 | |
| 109 | return res; |
| 110 | } |
| 111 | |
| 112 | static int i2c_send_stop(struct rk3288_i2c_regs *reg_addr) |
| 113 | { |
| 114 | int res = 0; |
| 115 | int timeout = I2C_TIMEOUT_US; |
| 116 | |
| 117 | i2c_info("I2c Stop::Send Stop bit\n"); |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 118 | write32(®_addr->i2c_ipd, I2C_CLEANI); |
| 119 | write32(®_addr->i2c_con, I2C_EN | I2C_STOP); |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 120 | while (timeout--) { |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 121 | if (read32(®_addr->i2c_ipd) & I2C_STOPI) |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 122 | break; |
| 123 | udelay(1); |
| 124 | } |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 125 | write32(®_addr->i2c_con, 0); |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 126 | if (timeout <= 0) { |
| 127 | printk(BIOS_ERR, "I2C Stop::Send Stop Bit Timeout\n"); |
| 128 | res = I2C_TIMEOUT; |
| 129 | } |
| 130 | |
| 131 | return res; |
| 132 | } |
| 133 | |
| 134 | static int i2c_read(struct rk3288_i2c_regs *reg_addr, struct i2c_seg segment) |
| 135 | { |
| 136 | int res = 0; |
| 137 | uint8_t *data = segment.buf; |
| 138 | int timeout = I2C_TIMEOUT_US; |
| 139 | unsigned int bytes_remaining = segment.len; |
| 140 | unsigned int bytes_transfered = 0; |
| 141 | unsigned int words_transfered = 0; |
| 142 | unsigned int rxdata = 0; |
| 143 | unsigned int con = 0; |
| 144 | unsigned int i, j; |
| 145 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 146 | write32(®_addr->i2c_mrxaddr, I2C_8BIT | segment.chip << 1 | 1); |
| 147 | write32(®_addr->i2c_mrxraddr, 0); |
Daisuke Nojiri | 51de5a8 | 2014-09-18 12:35:09 -0700 | [diff] [blame] | 148 | con = I2C_MODE_TRX | I2C_EN | I2C_ACT2NAK; |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 149 | while (bytes_remaining) { |
| 150 | bytes_transfered = MIN(bytes_remaining, 32); |
| 151 | bytes_remaining -= bytes_transfered; |
| 152 | if (!bytes_remaining) |
| 153 | con |= I2C_EN | I2C_NAK; |
| 154 | words_transfered = ALIGN_UP(bytes_transfered, 4) / 4; |
| 155 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 156 | write32(®_addr->i2c_ipd, I2C_CLEANI); |
| 157 | write32(®_addr->i2c_con, con); |
| 158 | write32(®_addr->i2c_mrxcnt, bytes_transfered); |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 159 | |
| 160 | timeout = I2C_TIMEOUT_US; |
| 161 | while (timeout--) { |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 162 | if (read32(®_addr->i2c_ipd) & I2C_NAKRCVI) { |
| 163 | write32(®_addr->i2c_mrxcnt, 0); |
| 164 | write32(®_addr->i2c_con, 0); |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 165 | return I2C_NOACK; |
| 166 | } |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 167 | if (read32(®_addr->i2c_ipd) & I2C_MBRFI) |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 168 | break; |
| 169 | udelay(1); |
| 170 | } |
| 171 | if (timeout <= 0) { |
| 172 | printk(BIOS_ERR, "I2C Read::Recv Data Timeout\n"); |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 173 | write32(®_addr->i2c_mrxcnt, 0); |
| 174 | write32(®_addr->i2c_con, 0); |
Daisuke Nojiri | 51de5a8 | 2014-09-18 12:35:09 -0700 | [diff] [blame] | 175 | return I2C_TIMEOUT; |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | for (i = 0; i < words_transfered; i++) { |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 179 | rxdata = read32(®_addr->rxdata[i]); |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 180 | i2c_info("I2c Read::RXDATA[%d] = 0x%x\n", i, rxdata); |
| 181 | for (j = 0; j < 4; j++) { |
| 182 | if ((i * 4 + j) == bytes_transfered) |
| 183 | break; |
| 184 | *data++ = (rxdata >> (j * 8)) & 0xff; |
| 185 | } |
| 186 | } |
Daisuke Nojiri | 51de5a8 | 2014-09-18 12:35:09 -0700 | [diff] [blame] | 187 | con = I2C_MODE_RX | I2C_EN | I2C_ACT2NAK; |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 188 | } |
| 189 | return res; |
| 190 | } |
| 191 | |
| 192 | static int i2c_write(struct rk3288_i2c_regs *reg_addr, struct i2c_seg segment) |
| 193 | { |
| 194 | int res = 0; |
| 195 | uint8_t *data = segment.buf; |
| 196 | int timeout = I2C_TIMEOUT_US; |
| 197 | int bytes_remaining = segment.len + 1; |
| 198 | int bytes_transfered = 0; |
| 199 | int words_transfered = 0; |
| 200 | unsigned int i; |
| 201 | unsigned int j = 1; |
| 202 | u32 txdata = 0; |
| 203 | |
| 204 | txdata |= (segment.chip << 1); |
| 205 | while (bytes_remaining) { |
| 206 | bytes_transfered = MIN(bytes_remaining, 32); |
| 207 | words_transfered = ALIGN_UP(bytes_transfered, 4) / 4; |
| 208 | for (i = 0; i < words_transfered; i++) { |
| 209 | do { |
| 210 | if ((i * 4 + j) == bytes_transfered) |
| 211 | break; |
| 212 | txdata |= (*data++) << (j * 8); |
| 213 | } while (++j < 4); |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 214 | write32(®_addr->txdata[i], txdata); |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 215 | j = 0; |
| 216 | i2c_info("I2c Write::TXDATA[%d] = 0x%x\n", i, txdata); |
| 217 | txdata = 0; |
| 218 | } |
| 219 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 220 | write32(®_addr->i2c_ipd, I2C_CLEANI); |
| 221 | write32(®_addr->i2c_con, |
| 222 | I2C_EN | I2C_MODE_TX | I2C_ACT2NAK); |
| 223 | write32(®_addr->i2c_mtxcnt, bytes_transfered); |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 224 | |
| 225 | timeout = I2C_TIMEOUT_US; |
| 226 | while (timeout--) { |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 227 | if (read32(®_addr->i2c_ipd) & I2C_NAKRCVI) { |
| 228 | write32(®_addr->i2c_mtxcnt, 0); |
| 229 | write32(®_addr->i2c_con, 0); |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 230 | return I2C_NOACK; |
| 231 | } |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 232 | if (read32(®_addr->i2c_ipd) & I2C_MBTFI) |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 233 | break; |
| 234 | udelay(1); |
| 235 | } |
| 236 | |
| 237 | if (timeout <= 0) { |
| 238 | printk(BIOS_ERR, "I2C Write::Send Data Timeout\n"); |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 239 | write32(®_addr->i2c_mtxcnt, 0); |
| 240 | write32(®_addr->i2c_con, 0); |
Daisuke Nojiri | 51de5a8 | 2014-09-18 12:35:09 -0700 | [diff] [blame] | 241 | return I2C_TIMEOUT; |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | bytes_remaining -= bytes_transfered; |
| 245 | } |
| 246 | return res; |
| 247 | } |
| 248 | |
| 249 | static int i2c_do_xfer(void *reg_addr, struct i2c_seg segment) |
| 250 | { |
| 251 | int res = 0; |
| 252 | |
| 253 | if (i2c_send_start(reg_addr)) |
| 254 | return I2C_TIMEOUT; |
| 255 | if (segment.read) |
| 256 | res = i2c_read(reg_addr, segment); |
| 257 | else |
| 258 | res = i2c_write(reg_addr, segment); |
| 259 | return i2c_send_stop(reg_addr) || res; |
| 260 | } |
| 261 | |
| 262 | int platform_i2c_transfer(unsigned bus, struct i2c_seg *segments, int seg_count) |
| 263 | { |
| 264 | int i; |
| 265 | int res = 0; |
| 266 | struct rk3288_i2c_regs *regs = i2c_bus[bus]; |
Daisuke Nojiri | 51de5a8 | 2014-09-18 12:35:09 -0700 | [diff] [blame] | 267 | struct i2c_seg *seg = segments; |
huang lin | 441a578 | 2014-07-30 20:34:40 -0700 | [diff] [blame] | 268 | |
| 269 | for (i = 0; i < seg_count; i++, seg++) { |
| 270 | res = i2c_do_xfer(regs, *seg); |
| 271 | if (res) |
| 272 | break; |
| 273 | } |
| 274 | return res; |
| 275 | } |
huang lin | bbcffd9 | 2014-09-27 12:02:27 +0800 | [diff] [blame] | 276 | |
| 277 | void i2c_init(unsigned int bus, unsigned int hz) |
| 278 | { |
| 279 | unsigned int clk_div; |
| 280 | unsigned int divl; |
| 281 | unsigned int divh; |
huang lin | 8affee5 | 2014-10-10 23:26:21 -0700 | [diff] [blame] | 282 | unsigned int i2c_src_clk = 0; |
huang lin | bbcffd9 | 2014-09-27 12:02:27 +0800 | [diff] [blame] | 283 | struct rk3288_i2c_regs *regs = i2c_bus[bus]; |
| 284 | |
| 285 | /*i2c0,i2c2 src clk from pd_bus_pclk |
| 286 | other i2c src clk from peri_pclk |
| 287 | */ |
| 288 | switch (bus) { |
| 289 | case 0: |
| 290 | case 2: |
| 291 | i2c_src_clk = PD_BUS_PCLK_HZ; |
| 292 | break; |
| 293 | case 1: |
| 294 | case 3: |
| 295 | case 4: |
| 296 | case 5: |
| 297 | i2c_src_clk = PERI_PCLK_HZ; |
| 298 | break; |
| 299 | default: |
| 300 | break; |
| 301 | } |
| 302 | |
| 303 | /*SCL Divisor = 8*(CLKDIVL + 1 + CLKDIVH + 1) |
| 304 | SCL = PCLK/ SCLK Divisor |
| 305 | */ |
huang lin | 8affee5 | 2014-10-10 23:26:21 -0700 | [diff] [blame] | 306 | clk_div = div_round_up(i2c_src_clk, hz * 8); |
| 307 | divh = clk_div * 3 / 7 - 1; |
| 308 | divl = clk_div - divh - 2; |
huang lin | bbcffd9 | 2014-09-27 12:02:27 +0800 | [diff] [blame] | 309 | assert((divh < 65536) && (divl < 65536)); |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 310 | write32(®s->i2c_clkdiv, (divh << 16) | (divl << 0)); |
huang lin | bbcffd9 | 2014-09-27 12:02:27 +0800 | [diff] [blame] | 311 | } |