Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 1 | /* |
| 2 | * i2c driver for Freescale mx31 |
| 3 | * |
| 4 | * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de> |
| 5 | * |
| 6 | * See file CREDITS for list of people who contributed to this |
| 7 | * project. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License as |
| 11 | * published by the Free Software Foundation; either version 2 of |
| 12 | * the License, or (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 22 | * MA 02111-1307 USA |
| 23 | */ |
| 24 | |
| 25 | #include <common.h> |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 26 | #include <asm/io.h> |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 27 | |
Michal Simek | a4a549b | 2008-07-14 19:45:35 +0200 | [diff] [blame] | 28 | #if defined(CONFIG_HARD_I2C) |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 29 | |
Liu Hui-R64343 | 127cec1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 30 | #if defined(CONFIG_MX31) |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 31 | #include <asm/arch/mx31.h> |
| 32 | #include <asm/arch/mx31-regs.h> |
Stefano Babic | 0422061 | 2011-01-19 22:46:26 +0000 | [diff] [blame] | 33 | #else |
| 34 | #include <asm/arch/imx-regs.h> |
Liu Hui-R64343 | 127cec1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 35 | #include <asm/arch/clock.h> |
| 36 | #endif |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 37 | |
| 38 | #define IADR 0x00 |
| 39 | #define IFDR 0x04 |
| 40 | #define I2CR 0x08 |
| 41 | #define I2SR 0x0c |
| 42 | #define I2DR 0x10 |
| 43 | |
| 44 | #define I2CR_IEN (1 << 7) |
| 45 | #define I2CR_IIEN (1 << 6) |
| 46 | #define I2CR_MSTA (1 << 5) |
| 47 | #define I2CR_MTX (1 << 4) |
| 48 | #define I2CR_TX_NO_AK (1 << 3) |
| 49 | #define I2CR_RSTA (1 << 2) |
| 50 | |
| 51 | #define I2SR_ICF (1 << 7) |
| 52 | #define I2SR_IBB (1 << 5) |
| 53 | #define I2SR_IIF (1 << 1) |
| 54 | #define I2SR_RX_NO_AK (1 << 0) |
| 55 | |
Liu Hui-R64343 | 127cec1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 56 | #if defined(CONFIG_SYS_I2C_MX31_PORT1) |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 57 | #define I2C_BASE 0x43f80000 |
Guennadi Liakhovetski | e7de18a | 2009-02-13 09:23:36 +0100 | [diff] [blame] | 58 | #define I2C_CLK_OFFSET 26 |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 59 | #elif defined (CONFIG_SYS_I2C_MX31_PORT2) |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 60 | #define I2C_BASE 0x43f98000 |
Guennadi Liakhovetski | e7de18a | 2009-02-13 09:23:36 +0100 | [diff] [blame] | 61 | #define I2C_CLK_OFFSET 28 |
Jean-Christophe PLAGNIOL-VILLARD | 6d0f6bc | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 62 | #elif defined (CONFIG_SYS_I2C_MX31_PORT3) |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 63 | #define I2C_BASE 0x43f84000 |
Guennadi Liakhovetski | e7de18a | 2009-02-13 09:23:36 +0100 | [diff] [blame] | 64 | #define I2C_CLK_OFFSET 30 |
Liu Hui-R64343 | 127cec1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 65 | #elif defined(CONFIG_SYS_I2C_MX53_PORT1) |
| 66 | #define I2C_BASE I2C1_BASE_ADDR |
| 67 | #elif defined(CONFIG_SYS_I2C_MX53_PORT2) |
| 68 | #define I2C_BASE I2C2_BASE_ADDR |
Stefano Babic | 0422061 | 2011-01-19 22:46:26 +0000 | [diff] [blame] | 69 | #elif defined(CONFIG_SYS_I2C_MX35_PORT1) |
| 70 | #define I2C_BASE I2C_BASE_ADDR |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 71 | #else |
Stefano Babic | 0422061 | 2011-01-19 22:46:26 +0000 | [diff] [blame] | 72 | #error "define CONFIG_SYS_I2C_MX<Processor>_PORTx to use the mx I2C driver" |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 73 | #endif |
| 74 | |
| 75 | #ifdef DEBUG |
| 76 | #define DPRINTF(args...) printf(args) |
| 77 | #else |
| 78 | #define DPRINTF(args...) |
| 79 | #endif |
| 80 | |
| 81 | static u16 div[] = { 30, 32, 36, 42, 48, 52, 60, 72, 80, 88, 104, 128, 144, |
| 82 | 160, 192, 240, 288, 320, 384, 480, 576, 640, 768, 960, |
| 83 | 1152, 1280, 1536, 1920, 2304, 2560, 3072, 3840}; |
| 84 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 85 | static inline void i2c_reset(void) |
| 86 | { |
| 87 | writew(0, I2C_BASE + I2CR); /* Reset module */ |
| 88 | writew(0, I2C_BASE + I2SR); |
| 89 | writew(I2CR_IEN, I2C_BASE + I2CR); |
| 90 | } |
| 91 | |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 92 | void i2c_init(int speed, int unused) |
| 93 | { |
Liu Hui-R64343 | 127cec1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 94 | int freq; |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 95 | int i; |
| 96 | |
Liu Hui-R64343 | 127cec1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 97 | #if defined(CONFIG_MX31) |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 98 | struct clock_control_regs *sc_regs = |
| 99 | (struct clock_control_regs *)CCM_BASE; |
| 100 | |
Liu Hui-R64343 | 127cec1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 101 | freq = mx31_get_ipg_clk(); |
Guennadi Liakhovetski | e7de18a | 2009-02-13 09:23:36 +0100 | [diff] [blame] | 102 | /* start the required I2C clock */ |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 103 | writel(readl(&sc_regs->cgr0) | (3 << I2C_CLK_OFFSET), |
| 104 | &sc_regs->cgr0); |
Liu Hui-R64343 | 127cec1 | 2011-01-03 22:27:39 +0000 | [diff] [blame] | 105 | #else |
| 106 | freq = mxc_get_clock(MXC_IPG_PERCLK); |
| 107 | #endif |
Guennadi Liakhovetski | e7de18a | 2009-02-13 09:23:36 +0100 | [diff] [blame] | 108 | |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 109 | for (i = 0; i < 0x1f; i++) |
| 110 | if (freq / div[i] <= speed) |
| 111 | break; |
| 112 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 113 | debug("%s: speed: %d\n", __func__, speed); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 114 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 115 | writew(i, I2C_BASE + IFDR); |
| 116 | i2c_reset(); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | static int wait_busy(void) |
| 120 | { |
| 121 | int timeout = 10000; |
| 122 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 123 | while (!(readw(I2C_BASE + I2SR) & I2SR_IIF) && --timeout) |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 124 | udelay(1); |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 125 | writew(0, I2C_BASE + I2SR); /* clear interrupt */ |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 126 | |
| 127 | return timeout; |
| 128 | } |
| 129 | |
| 130 | static int tx_byte(u8 byte) |
| 131 | { |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 132 | writew(byte, I2C_BASE + I2DR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 133 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 134 | if (!wait_busy() || readw(I2C_BASE + I2SR) & I2SR_RX_NO_AK) |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 135 | return -1; |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | static int rx_byte(void) |
| 140 | { |
| 141 | if (!wait_busy()) |
| 142 | return -1; |
| 143 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 144 | return readw(I2C_BASE + I2DR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | int i2c_probe(uchar chip) |
| 148 | { |
| 149 | int ret; |
| 150 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 151 | writew(0, I2C_BASE + I2CR); /* Reset module */ |
| 152 | writew(I2CR_IEN, I2C_BASE + I2CR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 153 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 154 | writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX, I2C_BASE + I2CR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 155 | ret = tx_byte(chip << 1); |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 156 | writew(I2CR_IEN | I2CR_MTX, I2C_BASE + I2CR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 157 | |
| 158 | return ret; |
| 159 | } |
| 160 | |
| 161 | static int i2c_addr(uchar chip, uint addr, int alen) |
| 162 | { |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 163 | writew(0, I2C_BASE + I2SR); |
| 164 | writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX, I2C_BASE + I2CR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 165 | |
| 166 | if (tx_byte(chip << 1)) |
| 167 | return -1; |
| 168 | |
| 169 | while (alen--) |
| 170 | if (tx_byte((addr >> (alen * 8)) & 0xff)) |
| 171 | return -1; |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) |
| 176 | { |
| 177 | int timeout = 10000; |
| 178 | int ret; |
| 179 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 180 | debug("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n", |
| 181 | __func__, chip, addr, alen, len); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 182 | |
| 183 | if (i2c_addr(chip, addr, alen)) { |
| 184 | printf("i2c_addr failed\n"); |
| 185 | return -1; |
| 186 | } |
| 187 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 188 | writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX | I2CR_RSTA, I2C_BASE + I2CR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 189 | |
| 190 | if (tx_byte(chip << 1 | 1)) |
| 191 | return -1; |
| 192 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 193 | writew(I2CR_IEN | I2CR_MSTA | |
| 194 | ((len == 1) ? I2CR_TX_NO_AK : 0), |
| 195 | I2C_BASE + I2CR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 196 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 197 | ret = readw(I2C_BASE + I2DR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 198 | |
| 199 | while (len--) { |
| 200 | if ((ret = rx_byte()) < 0) |
| 201 | return -1; |
| 202 | *buf++ = ret; |
| 203 | if (len <= 1) |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 204 | writew(I2CR_IEN | I2CR_MSTA | |
| 205 | I2CR_TX_NO_AK, |
| 206 | I2C_BASE + I2CR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | wait_busy(); |
| 210 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 211 | writew(I2CR_IEN, I2C_BASE + I2CR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 212 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 213 | while (readw(I2C_BASE + I2SR) & I2SR_IBB && --timeout) |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 214 | udelay(1); |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) |
| 220 | { |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 221 | int timeout = I2C_MAX_TIMEOUT; |
| 222 | debug("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n", |
| 223 | __func__, chip, addr, alen, len); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 224 | |
| 225 | if (i2c_addr(chip, addr, alen)) |
| 226 | return -1; |
| 227 | |
| 228 | while (len--) |
| 229 | if (tx_byte(*buf++)) |
| 230 | return -1; |
| 231 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 232 | writew(I2CR_IEN, I2C_BASE + I2CR); |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 233 | |
Stefano Babic | 1d549ad | 2011-01-20 07:50:44 +0000 | [diff] [blame^] | 234 | while (readw(I2C_BASE + I2SR) & I2SR_IBB && --timeout) |
Sascha Hauer | cdace06 | 2008-03-26 20:40:49 +0100 | [diff] [blame] | 235 | udelay(1); |
| 236 | |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | #endif /* CONFIG_HARD_I2C */ |