Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 1 | /* |
Wolfram Sang | 3d99bea | 2014-05-28 09:44:46 +0200 | [diff] [blame] | 2 | * Driver for the Renesas RCar I2C unit |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 3 | * |
Wolfram Sang | 708ca40 | 2015-09-03 22:20:13 +0200 | [diff] [blame] | 4 | * Copyright (C) 2014-15 Wolfram Sang <wsa@sang-engineering.com> |
| 5 | * Copyright (C) 2011-2015 Renesas Electronics Corporation |
Wolfram Sang | 3d99bea | 2014-05-28 09:44:46 +0200 | [diff] [blame] | 6 | * |
| 7 | * Copyright (C) 2012-14 Renesas Solutions Corp. |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 8 | * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> |
| 9 | * |
| 10 | * This file is based on the drivers/i2c/busses/i2c-sh7760.c |
| 11 | * (c) 2005-2008 MSC Vertriebsges.m.b.H, Manuel Lauss <mlau@msc-ge.com> |
| 12 | * |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
Wolfram Sang | 3d99bea | 2014-05-28 09:44:46 +0200 | [diff] [blame] | 15 | * the Free Software Foundation; version 2 of the License. |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 21 | */ |
| 22 | #include <linux/clk.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/err.h> |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/io.h> |
| 27 | #include <linux/i2c.h> |
| 28 | #include <linux/i2c/i2c-rcar.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/module.h> |
Guennadi Liakhovetski | 7679c0e | 2013-09-12 14:36:46 +0200 | [diff] [blame] | 31 | #include <linux/of_device.h> |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 32 | #include <linux/platform_device.h> |
| 33 | #include <linux/pm_runtime.h> |
| 34 | #include <linux/slab.h> |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 35 | |
| 36 | /* register offsets */ |
| 37 | #define ICSCR 0x00 /* slave ctrl */ |
| 38 | #define ICMCR 0x04 /* master ctrl */ |
| 39 | #define ICSSR 0x08 /* slave status */ |
| 40 | #define ICMSR 0x0C /* master status */ |
| 41 | #define ICSIER 0x10 /* slave irq enable */ |
| 42 | #define ICMIER 0x14 /* master irq enable */ |
| 43 | #define ICCCR 0x18 /* clock dividers */ |
| 44 | #define ICSAR 0x1C /* slave address */ |
| 45 | #define ICMAR 0x20 /* master address */ |
| 46 | #define ICRXTX 0x24 /* data port */ |
| 47 | |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 48 | /* ICSCR */ |
| 49 | #define SDBS (1 << 3) /* slave data buffer select */ |
| 50 | #define SIE (1 << 2) /* slave interface enable */ |
| 51 | #define GCAE (1 << 1) /* general call address enable */ |
| 52 | #define FNA (1 << 0) /* forced non acknowledgment */ |
| 53 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 54 | /* ICMCR */ |
| 55 | #define MDBS (1 << 7) /* non-fifo mode switch */ |
| 56 | #define FSCL (1 << 6) /* override SCL pin */ |
| 57 | #define FSDA (1 << 5) /* override SDA pin */ |
| 58 | #define OBPC (1 << 4) /* override pins */ |
| 59 | #define MIE (1 << 3) /* master if enable */ |
| 60 | #define TSBE (1 << 2) |
| 61 | #define FSB (1 << 1) /* force stop bit */ |
| 62 | #define ESG (1 << 0) /* en startbit gen */ |
| 63 | |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 64 | /* ICSSR (also for ICSIER) */ |
| 65 | #define GCAR (1 << 6) /* general call received */ |
| 66 | #define STM (1 << 5) /* slave transmit mode */ |
| 67 | #define SSR (1 << 4) /* stop received */ |
| 68 | #define SDE (1 << 3) /* slave data empty */ |
| 69 | #define SDT (1 << 2) /* slave data transmitted */ |
| 70 | #define SDR (1 << 1) /* slave data received */ |
| 71 | #define SAR (1 << 0) /* slave addr received */ |
| 72 | |
Wolfram Sang | 3e3aaba | 2014-05-28 09:44:44 +0200 | [diff] [blame] | 73 | /* ICMSR (also for ICMIE) */ |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 74 | #define MNR (1 << 6) /* nack received */ |
| 75 | #define MAL (1 << 5) /* arbitration lost */ |
| 76 | #define MST (1 << 4) /* sent a stop */ |
| 77 | #define MDE (1 << 3) |
| 78 | #define MDT (1 << 2) |
| 79 | #define MDR (1 << 1) |
| 80 | #define MAT (1 << 0) /* slave addr xfer done */ |
| 81 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 82 | |
Wolfram Sang | 4f443a8 | 2014-05-28 09:44:38 +0200 | [diff] [blame] | 83 | #define RCAR_BUS_PHASE_START (MDBS | MIE | ESG) |
| 84 | #define RCAR_BUS_PHASE_DATA (MDBS | MIE) |
Wolfram Sang | e5a7eff | 2015-09-03 22:20:12 +0200 | [diff] [blame] | 85 | #define RCAR_BUS_MASK_DATA (~(ESG | FSB) & 0xFF) |
Wolfram Sang | 4f443a8 | 2014-05-28 09:44:38 +0200 | [diff] [blame] | 86 | #define RCAR_BUS_PHASE_STOP (MDBS | MIE | FSB) |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 87 | |
Wolfram Sang | 3e3aaba | 2014-05-28 09:44:44 +0200 | [diff] [blame] | 88 | #define RCAR_IRQ_SEND (MNR | MAL | MST | MAT | MDE) |
| 89 | #define RCAR_IRQ_RECV (MNR | MAL | MST | MAT | MDR) |
| 90 | #define RCAR_IRQ_STOP (MST) |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 91 | |
Sergei Shtylyov | 938916f | 2014-09-06 03:34:32 +0400 | [diff] [blame] | 92 | #define RCAR_IRQ_ACK_SEND (~(MAT | MDE) & 0xFF) |
| 93 | #define RCAR_IRQ_ACK_RECV (~(MAT | MDR) & 0xFF) |
Wolfram Sang | 3c95de6 | 2014-05-28 09:44:42 +0200 | [diff] [blame] | 94 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 95 | #define ID_LAST_MSG (1 << 0) |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 96 | #define ID_DONE (1 << 2) |
| 97 | #define ID_ARBLOST (1 << 3) |
| 98 | #define ID_NACK (1 << 4) |
| 99 | |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 100 | enum rcar_i2c_type { |
Kuninori Morimoto | 043a3f1 | 2013-10-21 01:04:32 -0700 | [diff] [blame] | 101 | I2C_RCAR_GEN1, |
| 102 | I2C_RCAR_GEN2, |
Wolfram Sang | e7db0d3 | 2015-08-05 15:18:25 +0200 | [diff] [blame^] | 103 | I2C_RCAR_GEN3, |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 104 | }; |
| 105 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 106 | struct rcar_i2c_priv { |
| 107 | void __iomem *io; |
| 108 | struct i2c_adapter adap; |
Wolfram Sang | 344beeb | 2015-09-03 22:20:08 +0200 | [diff] [blame] | 109 | struct i2c_msg *msg; |
| 110 | int msgs_left; |
Ben Dooks | bc8120f | 2014-01-26 16:05:35 +0000 | [diff] [blame] | 111 | struct clk *clk; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 112 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 113 | wait_queue_head_t wait; |
| 114 | |
| 115 | int pos; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 116 | u32 icccr; |
| 117 | u32 flags; |
Wolfram Sang | 51371cd | 2014-05-28 09:44:45 +0200 | [diff] [blame] | 118 | enum rcar_i2c_type devtype; |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 119 | struct i2c_client *slave; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 120 | }; |
| 121 | |
| 122 | #define rcar_i2c_priv_to_dev(p) ((p)->adap.dev.parent) |
| 123 | #define rcar_i2c_is_recv(p) ((p)->msg->flags & I2C_M_RD) |
| 124 | |
| 125 | #define rcar_i2c_flags_set(p, f) ((p)->flags |= (f)) |
| 126 | #define rcar_i2c_flags_has(p, f) ((p)->flags & (f)) |
| 127 | |
| 128 | #define LOOP_TIMEOUT 1024 |
| 129 | |
Wolfram Sang | 51371cd | 2014-05-28 09:44:45 +0200 | [diff] [blame] | 130 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 131 | static void rcar_i2c_write(struct rcar_i2c_priv *priv, int reg, u32 val) |
| 132 | { |
| 133 | writel(val, priv->io + reg); |
| 134 | } |
| 135 | |
| 136 | static u32 rcar_i2c_read(struct rcar_i2c_priv *priv, int reg) |
| 137 | { |
| 138 | return readl(priv->io + reg); |
| 139 | } |
| 140 | |
| 141 | static void rcar_i2c_init(struct rcar_i2c_priv *priv) |
| 142 | { |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 143 | /* reset master mode */ |
| 144 | rcar_i2c_write(priv, ICMIER, 0); |
Wolfram Sang | 93c659d | 2015-09-03 22:20:05 +0200 | [diff] [blame] | 145 | rcar_i2c_write(priv, ICMCR, MDBS); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 146 | rcar_i2c_write(priv, ICMSR, 0); |
Wolfram Sang | 93c659d | 2015-09-03 22:20:05 +0200 | [diff] [blame] | 147 | /* start clock */ |
| 148 | rcar_i2c_write(priv, ICCCR, priv->icccr); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 151 | static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv) |
| 152 | { |
| 153 | int i; |
| 154 | |
| 155 | for (i = 0; i < LOOP_TIMEOUT; i++) { |
| 156 | /* make sure that bus is not busy */ |
| 157 | if (!(rcar_i2c_read(priv, ICMCR) & FSDA)) |
| 158 | return 0; |
| 159 | udelay(1); |
| 160 | } |
| 161 | |
| 162 | return -EBUSY; |
| 163 | } |
| 164 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 165 | static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, |
| 166 | u32 bus_speed, |
| 167 | struct device *dev) |
| 168 | { |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 169 | u32 scgd, cdf; |
| 170 | u32 round, ick; |
| 171 | u32 scl; |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 172 | u32 cdf_width; |
Guennadi Liakhovetski | 8d04940 | 2013-09-12 14:36:45 +0200 | [diff] [blame] | 173 | unsigned long rate; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 174 | |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 175 | switch (priv->devtype) { |
Kuninori Morimoto | 043a3f1 | 2013-10-21 01:04:32 -0700 | [diff] [blame] | 176 | case I2C_RCAR_GEN1: |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 177 | cdf_width = 2; |
| 178 | break; |
Kuninori Morimoto | 043a3f1 | 2013-10-21 01:04:32 -0700 | [diff] [blame] | 179 | case I2C_RCAR_GEN2: |
Wolfram Sang | e7db0d3 | 2015-08-05 15:18:25 +0200 | [diff] [blame^] | 180 | case I2C_RCAR_GEN3: |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 181 | cdf_width = 3; |
| 182 | break; |
| 183 | default: |
| 184 | dev_err(dev, "device type error\n"); |
| 185 | return -EIO; |
| 186 | } |
| 187 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 188 | /* |
| 189 | * calculate SCL clock |
| 190 | * see |
| 191 | * ICCCR |
| 192 | * |
| 193 | * ick = clkp / (1 + CDF) |
| 194 | * SCL = ick / (20 + SCGD * 8 + F[(ticf + tr + intd) * ick]) |
| 195 | * |
| 196 | * ick : I2C internal clock < 20 MHz |
| 197 | * ticf : I2C SCL falling time = 35 ns here |
| 198 | * tr : I2C SCL rising time = 200 ns here |
| 199 | * intd : LSI internal delay = 50 ns here |
| 200 | * clkp : peripheral_clk |
| 201 | * F[] : integer up-valuation |
| 202 | */ |
Ben Dooks | bc8120f | 2014-01-26 16:05:35 +0000 | [diff] [blame] | 203 | rate = clk_get_rate(priv->clk); |
Guennadi Liakhovetski | 8d04940 | 2013-09-12 14:36:45 +0200 | [diff] [blame] | 204 | cdf = rate / 20000000; |
Wolfram Sang | 22762cc | 2014-09-20 12:07:37 +0200 | [diff] [blame] | 205 | if (cdf >= 1U << cdf_width) { |
Guennadi Liakhovetski | 8d04940 | 2013-09-12 14:36:45 +0200 | [diff] [blame] | 206 | dev_err(dev, "Input clock %lu too high\n", rate); |
| 207 | return -EIO; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 208 | } |
Guennadi Liakhovetski | 8d04940 | 2013-09-12 14:36:45 +0200 | [diff] [blame] | 209 | ick = rate / (cdf + 1); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 210 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 211 | /* |
| 212 | * it is impossible to calculate large scale |
| 213 | * number on u32. separate it |
| 214 | * |
| 215 | * F[(ticf + tr + intd) * ick] |
| 216 | * = F[(35 + 200 + 50)ns * ick] |
| 217 | * = F[285 * ick / 1000000000] |
| 218 | * = F[(ick / 1000000) * 285 / 1000] |
| 219 | */ |
| 220 | round = (ick + 500000) / 1000000 * 285; |
| 221 | round = (round + 500) / 1000; |
| 222 | |
| 223 | /* |
| 224 | * SCL = ick / (20 + SCGD * 8 + F[(ticf + tr + intd) * ick]) |
| 225 | * |
| 226 | * Calculation result (= SCL) should be less than |
| 227 | * bus_speed for hardware safety |
Guennadi Liakhovetski | 8d04940 | 2013-09-12 14:36:45 +0200 | [diff] [blame] | 228 | * |
| 229 | * We could use something along the lines of |
| 230 | * div = ick / (bus_speed + 1) + 1; |
| 231 | * scgd = (div - 20 - round + 7) / 8; |
| 232 | * scl = ick / (20 + (scgd * 8) + round); |
| 233 | * (not fully verified) but that would get pretty involved |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 234 | */ |
| 235 | for (scgd = 0; scgd < 0x40; scgd++) { |
| 236 | scl = ick / (20 + (scgd * 8) + round); |
| 237 | if (scl <= bus_speed) |
| 238 | goto scgd_find; |
| 239 | } |
| 240 | dev_err(dev, "it is impossible to calculate best SCL\n"); |
| 241 | return -EIO; |
| 242 | |
| 243 | scgd_find: |
| 244 | dev_dbg(dev, "clk %d/%d(%lu), round %u, CDF:0x%x, SCGD: 0x%x\n", |
Ben Dooks | bc8120f | 2014-01-26 16:05:35 +0000 | [diff] [blame] | 245 | scl, bus_speed, clk_get_rate(priv->clk), round, cdf, scgd); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 246 | |
Wolfram Sang | 708ca40 | 2015-09-03 22:20:13 +0200 | [diff] [blame] | 247 | /* keep icccr value */ |
Guennadi Liakhovetski | 14d32f1 | 2013-09-12 14:36:44 +0200 | [diff] [blame] | 248 | priv->icccr = scgd << cdf_width | cdf; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
Sergei Shtylyov | 7c7117f | 2014-09-15 00:15:46 +0400 | [diff] [blame] | 253 | static void rcar_i2c_prepare_msg(struct rcar_i2c_priv *priv) |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 254 | { |
Wolfram Sang | 386babf | 2014-05-28 09:44:41 +0200 | [diff] [blame] | 255 | int read = !!rcar_i2c_is_recv(priv); |
| 256 | |
Wolfram Sang | 344beeb | 2015-09-03 22:20:08 +0200 | [diff] [blame] | 257 | priv->pos = 0; |
| 258 | priv->flags = 0; |
| 259 | if (priv->msgs_left == 1) |
| 260 | rcar_i2c_flags_set(priv, ID_LAST_MSG); |
| 261 | |
Wolfram Sang | 386babf | 2014-05-28 09:44:41 +0200 | [diff] [blame] | 262 | rcar_i2c_write(priv, ICMAR, (priv->msg->addr << 1) | read); |
Wolfram Sang | 3c95de6 | 2014-05-28 09:44:42 +0200 | [diff] [blame] | 263 | rcar_i2c_write(priv, ICMSR, 0); |
Wolfram Sang | 4f443a8 | 2014-05-28 09:44:38 +0200 | [diff] [blame] | 264 | rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_START); |
Wolfram Sang | 386babf | 2014-05-28 09:44:41 +0200 | [diff] [blame] | 265 | rcar_i2c_write(priv, ICMIER, read ? RCAR_IRQ_RECV : RCAR_IRQ_SEND); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 268 | static void rcar_i2c_next_msg(struct rcar_i2c_priv *priv) |
| 269 | { |
| 270 | priv->msg++; |
| 271 | priv->msgs_left--; |
| 272 | rcar_i2c_prepare_msg(priv); |
| 273 | } |
| 274 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 275 | /* |
| 276 | * interrupt functions |
| 277 | */ |
| 278 | static int rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr) |
| 279 | { |
| 280 | struct i2c_msg *msg = priv->msg; |
| 281 | |
Wolfram Sang | 708ca40 | 2015-09-03 22:20:13 +0200 | [diff] [blame] | 282 | /* FIXME: sometimes, unknown interrupt happened. Do nothing */ |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 283 | if (!(msr & MDE)) |
| 284 | return 0; |
| 285 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 286 | if (priv->pos < msg->len) { |
| 287 | /* |
| 288 | * Prepare next data to ICRXTX register. |
| 289 | * This data will go to _SHIFT_ register. |
| 290 | * |
| 291 | * * |
| 292 | * [ICRXTX] -> [SHIFT] -> [I2C bus] |
| 293 | */ |
| 294 | rcar_i2c_write(priv, ICRXTX, msg->buf[priv->pos]); |
| 295 | priv->pos++; |
| 296 | |
| 297 | } else { |
| 298 | /* |
| 299 | * The last data was pushed to ICRXTX on _PREV_ empty irq. |
| 300 | * It is on _SHIFT_ register, and will sent to I2C bus. |
| 301 | * |
| 302 | * * |
| 303 | * [ICRXTX] -> [SHIFT] -> [I2C bus] |
| 304 | */ |
| 305 | |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 306 | if (priv->flags & ID_LAST_MSG) { |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 307 | /* |
| 308 | * If current msg is the _LAST_ msg, |
| 309 | * prepare stop condition here. |
| 310 | * ID_DONE will be set on STOP irq. |
| 311 | */ |
Wolfram Sang | 4f443a8 | 2014-05-28 09:44:38 +0200 | [diff] [blame] | 312 | rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP); |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 313 | } else { |
| 314 | rcar_i2c_next_msg(priv); |
| 315 | return 0; |
| 316 | } |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 317 | } |
| 318 | |
Wolfram Sang | 3c95de6 | 2014-05-28 09:44:42 +0200 | [diff] [blame] | 319 | rcar_i2c_write(priv, ICMSR, RCAR_IRQ_ACK_SEND); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 320 | |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | static int rcar_i2c_irq_recv(struct rcar_i2c_priv *priv, u32 msr) |
| 325 | { |
| 326 | struct i2c_msg *msg = priv->msg; |
| 327 | |
Wolfram Sang | 708ca40 | 2015-09-03 22:20:13 +0200 | [diff] [blame] | 328 | /* FIXME: sometimes, unknown interrupt happened. Do nothing */ |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 329 | if (!(msr & MDR)) |
| 330 | return 0; |
| 331 | |
| 332 | if (msr & MAT) { |
Wolfram Sang | e5a7eff | 2015-09-03 22:20:12 +0200 | [diff] [blame] | 333 | /* Address transfer phase finished, but no data at this point. */ |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 334 | } else if (priv->pos < msg->len) { |
Wolfram Sang | 708ca40 | 2015-09-03 22:20:13 +0200 | [diff] [blame] | 335 | /* get received data */ |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 336 | msg->buf[priv->pos] = rcar_i2c_read(priv, ICRXTX); |
| 337 | priv->pos++; |
| 338 | } |
| 339 | |
| 340 | /* |
Wolfram Sang | 708ca40 | 2015-09-03 22:20:13 +0200 | [diff] [blame] | 341 | * If next received data is the _LAST_, go to STOP phase. Might be |
| 342 | * overwritten by REP START when setting up a new msg. Not elegant |
| 343 | * but the only stable sequence for REP START I have found so far. |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 344 | */ |
| 345 | if (priv->pos + 1 >= msg->len) |
Wolfram Sang | 4f443a8 | 2014-05-28 09:44:38 +0200 | [diff] [blame] | 346 | rcar_i2c_write(priv, ICMCR, RCAR_BUS_PHASE_STOP); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 347 | |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 348 | if (priv->pos == msg->len && !(priv->flags & ID_LAST_MSG)) |
| 349 | rcar_i2c_next_msg(priv); |
| 350 | else |
| 351 | rcar_i2c_write(priv, ICMSR, RCAR_IRQ_ACK_RECV); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 352 | |
| 353 | return 0; |
| 354 | } |
| 355 | |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 356 | static bool rcar_i2c_slave_irq(struct rcar_i2c_priv *priv) |
| 357 | { |
| 358 | u32 ssr_raw, ssr_filtered; |
| 359 | u8 value; |
| 360 | |
| 361 | ssr_raw = rcar_i2c_read(priv, ICSSR) & 0xff; |
| 362 | ssr_filtered = ssr_raw & rcar_i2c_read(priv, ICSIER); |
| 363 | |
| 364 | if (!ssr_filtered) |
| 365 | return false; |
| 366 | |
| 367 | /* address detected */ |
| 368 | if (ssr_filtered & SAR) { |
| 369 | /* read or write request */ |
| 370 | if (ssr_raw & STM) { |
Wolfram Sang | 5b77d16 | 2015-03-23 09:26:36 +0100 | [diff] [blame] | 371 | i2c_slave_event(priv->slave, I2C_SLAVE_READ_REQUESTED, &value); |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 372 | rcar_i2c_write(priv, ICRXTX, value); |
| 373 | rcar_i2c_write(priv, ICSIER, SDE | SSR | SAR); |
| 374 | } else { |
Wolfram Sang | 5b77d16 | 2015-03-23 09:26:36 +0100 | [diff] [blame] | 375 | i2c_slave_event(priv->slave, I2C_SLAVE_WRITE_REQUESTED, &value); |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 376 | rcar_i2c_read(priv, ICRXTX); /* dummy read */ |
| 377 | rcar_i2c_write(priv, ICSIER, SDR | SSR | SAR); |
| 378 | } |
| 379 | |
| 380 | rcar_i2c_write(priv, ICSSR, ~SAR & 0xff); |
| 381 | } |
| 382 | |
| 383 | /* master sent stop */ |
| 384 | if (ssr_filtered & SSR) { |
| 385 | i2c_slave_event(priv->slave, I2C_SLAVE_STOP, &value); |
| 386 | rcar_i2c_write(priv, ICSIER, SAR | SSR); |
| 387 | rcar_i2c_write(priv, ICSSR, ~SSR & 0xff); |
| 388 | } |
| 389 | |
| 390 | /* master wants to write to us */ |
| 391 | if (ssr_filtered & SDR) { |
| 392 | int ret; |
| 393 | |
| 394 | value = rcar_i2c_read(priv, ICRXTX); |
Wolfram Sang | 5b77d16 | 2015-03-23 09:26:36 +0100 | [diff] [blame] | 395 | ret = i2c_slave_event(priv->slave, I2C_SLAVE_WRITE_RECEIVED, &value); |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 396 | /* Send NACK in case of error */ |
| 397 | rcar_i2c_write(priv, ICSCR, SIE | SDBS | (ret < 0 ? FNA : 0)); |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 398 | rcar_i2c_write(priv, ICSSR, ~SDR & 0xff); |
| 399 | } |
| 400 | |
| 401 | /* master wants to read from us */ |
| 402 | if (ssr_filtered & SDE) { |
Wolfram Sang | 5b77d16 | 2015-03-23 09:26:36 +0100 | [diff] [blame] | 403 | i2c_slave_event(priv->slave, I2C_SLAVE_READ_PROCESSED, &value); |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 404 | rcar_i2c_write(priv, ICRXTX, value); |
| 405 | rcar_i2c_write(priv, ICSSR, ~SDE & 0xff); |
| 406 | } |
| 407 | |
| 408 | return true; |
| 409 | } |
| 410 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 411 | static irqreturn_t rcar_i2c_irq(int irq, void *ptr) |
| 412 | { |
| 413 | struct rcar_i2c_priv *priv = ptr; |
Wolfram Sang | e5a7eff | 2015-09-03 22:20:12 +0200 | [diff] [blame] | 414 | u32 msr, val; |
| 415 | |
| 416 | /* Clear START or STOP as soon as we can */ |
| 417 | val = rcar_i2c_read(priv, ICMCR); |
| 418 | rcar_i2c_write(priv, ICMCR, val & RCAR_BUS_MASK_DATA); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 419 | |
Wolfram Sang | 1c176d5 | 2014-05-28 09:44:36 +0200 | [diff] [blame] | 420 | msr = rcar_i2c_read(priv, ICMSR); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 421 | |
Sergei Shtylyov | dd318b0 | 2014-09-02 01:15:26 +0400 | [diff] [blame] | 422 | /* Only handle interrupts that are currently enabled */ |
| 423 | msr &= rcar_i2c_read(priv, ICMIER); |
Sergei Shtylyov | aa5beaf | 2014-09-15 00:20:19 +0400 | [diff] [blame] | 424 | if (!msr) { |
Wolfram Sang | 2151ba7 | 2015-09-03 22:20:11 +0200 | [diff] [blame] | 425 | if (rcar_i2c_slave_irq(priv)) |
| 426 | return IRQ_HANDLED; |
| 427 | |
| 428 | return IRQ_NONE; |
Sergei Shtylyov | aa5beaf | 2014-09-15 00:20:19 +0400 | [diff] [blame] | 429 | } |
Sergei Shtylyov | dd318b0 | 2014-09-02 01:15:26 +0400 | [diff] [blame] | 430 | |
Wolfram Sang | 51371cd | 2014-05-28 09:44:45 +0200 | [diff] [blame] | 431 | /* Arbitration lost */ |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 432 | if (msr & MAL) { |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 433 | rcar_i2c_flags_set(priv, (ID_DONE | ID_ARBLOST)); |
| 434 | goto out; |
| 435 | } |
| 436 | |
Wolfram Sang | 51371cd | 2014-05-28 09:44:45 +0200 | [diff] [blame] | 437 | /* Nack */ |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 438 | if (msr & MNR) { |
Wolfram Sang | 315a173 | 2015-09-03 22:20:10 +0200 | [diff] [blame] | 439 | /* HW automatically sends STOP after received NACK */ |
Wolfram Sang | f238224 | 2014-05-28 09:44:39 +0200 | [diff] [blame] | 440 | rcar_i2c_write(priv, ICMIER, RCAR_IRQ_STOP); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 441 | rcar_i2c_flags_set(priv, ID_NACK); |
| 442 | goto out; |
| 443 | } |
| 444 | |
Sergei Shtylyov | dd318b0 | 2014-09-02 01:15:26 +0400 | [diff] [blame] | 445 | /* Stop */ |
| 446 | if (msr & MST) { |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 447 | priv->msgs_left--; /* The last message also made it */ |
Sergei Shtylyov | dd318b0 | 2014-09-02 01:15:26 +0400 | [diff] [blame] | 448 | rcar_i2c_flags_set(priv, ID_DONE); |
| 449 | goto out; |
| 450 | } |
| 451 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 452 | if (rcar_i2c_is_recv(priv)) |
| 453 | rcar_i2c_flags_set(priv, rcar_i2c_irq_recv(priv, msr)); |
| 454 | else |
| 455 | rcar_i2c_flags_set(priv, rcar_i2c_irq_send(priv, msr)); |
| 456 | |
| 457 | out: |
| 458 | if (rcar_i2c_flags_has(priv, ID_DONE)) { |
Wolfram Sang | f238224 | 2014-05-28 09:44:39 +0200 | [diff] [blame] | 459 | rcar_i2c_write(priv, ICMIER, 0); |
Wolfram Sang | 3c95de6 | 2014-05-28 09:44:42 +0200 | [diff] [blame] | 460 | rcar_i2c_write(priv, ICMSR, 0); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 461 | wake_up(&priv->wait); |
| 462 | } |
| 463 | |
Wolfram Sang | 2151ba7 | 2015-09-03 22:20:11 +0200 | [diff] [blame] | 464 | return IRQ_HANDLED; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | static int rcar_i2c_master_xfer(struct i2c_adapter *adap, |
| 468 | struct i2c_msg *msgs, |
| 469 | int num) |
| 470 | { |
| 471 | struct rcar_i2c_priv *priv = i2c_get_adapdata(adap); |
| 472 | struct device *dev = rcar_i2c_priv_to_dev(priv); |
Wolfram Sang | b6763d0 | 2015-06-20 21:03:20 +0200 | [diff] [blame] | 473 | int i, ret; |
Wolfram Sang | 738206de | 2015-09-03 22:20:07 +0200 | [diff] [blame] | 474 | long time_left; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 475 | |
| 476 | pm_runtime_get_sync(dev); |
| 477 | |
Wolfram Sang | 3f7de22 | 2014-05-28 09:44:40 +0200 | [diff] [blame] | 478 | ret = rcar_i2c_bus_barrier(priv); |
| 479 | if (ret < 0) |
| 480 | goto out; |
| 481 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 482 | for (i = 0; i < num; i++) { |
Wolfram Sang | d765396 | 2014-05-05 18:36:21 +0200 | [diff] [blame] | 483 | /* This HW can't send STOP after address phase */ |
| 484 | if (msgs[i].len == 0) { |
| 485 | ret = -EOPNOTSUPP; |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 486 | goto out; |
Wolfram Sang | d765396 | 2014-05-05 18:36:21 +0200 | [diff] [blame] | 487 | } |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 488 | } |
Wolfram Sang | d765396 | 2014-05-05 18:36:21 +0200 | [diff] [blame] | 489 | |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 490 | /* init data */ |
| 491 | priv->msg = msgs; |
| 492 | priv->msgs_left = num; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 493 | |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 494 | rcar_i2c_prepare_msg(priv); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 495 | |
Wolfram Sang | 2bc3c5a | 2015-09-03 22:20:09 +0200 | [diff] [blame] | 496 | time_left = wait_event_timeout(priv->wait, |
| 497 | rcar_i2c_flags_has(priv, ID_DONE), |
| 498 | num * adap->timeout); |
| 499 | if (!time_left) { |
| 500 | rcar_i2c_init(priv); |
| 501 | ret = -ETIMEDOUT; |
| 502 | } else if (rcar_i2c_flags_has(priv, ID_NACK)) { |
| 503 | ret = -ENXIO; |
| 504 | } else if (rcar_i2c_flags_has(priv, ID_ARBLOST)) { |
| 505 | ret = -EAGAIN; |
| 506 | } else { |
| 507 | ret = num - priv->msgs_left; /* The number of transfer */ |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 508 | } |
Wolfram Sang | 3f7de22 | 2014-05-28 09:44:40 +0200 | [diff] [blame] | 509 | out: |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 510 | pm_runtime_put(dev); |
| 511 | |
Ben Dooks | 6ff4b105 | 2014-01-26 16:05:37 +0000 | [diff] [blame] | 512 | if (ret < 0 && ret != -ENXIO) |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 513 | dev_err(dev, "error %d : %x\n", ret, priv->flags); |
| 514 | |
| 515 | return ret; |
| 516 | } |
| 517 | |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 518 | static int rcar_reg_slave(struct i2c_client *slave) |
| 519 | { |
| 520 | struct rcar_i2c_priv *priv = i2c_get_adapdata(slave->adapter); |
| 521 | |
| 522 | if (priv->slave) |
| 523 | return -EBUSY; |
| 524 | |
| 525 | if (slave->flags & I2C_CLIENT_TEN) |
| 526 | return -EAFNOSUPPORT; |
| 527 | |
| 528 | pm_runtime_forbid(rcar_i2c_priv_to_dev(priv)); |
| 529 | |
| 530 | priv->slave = slave; |
| 531 | rcar_i2c_write(priv, ICSAR, slave->addr); |
| 532 | rcar_i2c_write(priv, ICSSR, 0); |
| 533 | rcar_i2c_write(priv, ICSIER, SAR | SSR); |
| 534 | rcar_i2c_write(priv, ICSCR, SIE | SDBS); |
| 535 | |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | static int rcar_unreg_slave(struct i2c_client *slave) |
| 540 | { |
| 541 | struct rcar_i2c_priv *priv = i2c_get_adapdata(slave->adapter); |
| 542 | |
| 543 | WARN_ON(!priv->slave); |
| 544 | |
| 545 | rcar_i2c_write(priv, ICSIER, 0); |
| 546 | rcar_i2c_write(priv, ICSCR, 0); |
| 547 | |
| 548 | priv->slave = NULL; |
| 549 | |
| 550 | pm_runtime_allow(rcar_i2c_priv_to_dev(priv)); |
| 551 | |
| 552 | return 0; |
| 553 | } |
| 554 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 555 | static u32 rcar_i2c_func(struct i2c_adapter *adap) |
| 556 | { |
Wolfram Sang | d765396 | 2014-05-05 18:36:21 +0200 | [diff] [blame] | 557 | /* This HW can't do SMBUS_QUICK and NOSTART */ |
Wolfram Sang | 1fb2ad9 | 2015-05-14 14:40:03 +0200 | [diff] [blame] | 558 | return I2C_FUNC_I2C | I2C_FUNC_SLAVE | |
| 559 | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | static const struct i2c_algorithm rcar_i2c_algo = { |
| 563 | .master_xfer = rcar_i2c_master_xfer, |
| 564 | .functionality = rcar_i2c_func, |
Wolfram Sang | de20d18 | 2014-11-18 17:04:55 +0100 | [diff] [blame] | 565 | .reg_slave = rcar_reg_slave, |
| 566 | .unreg_slave = rcar_unreg_slave, |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 567 | }; |
| 568 | |
Guennadi Liakhovetski | 7679c0e | 2013-09-12 14:36:46 +0200 | [diff] [blame] | 569 | static const struct of_device_id rcar_i2c_dt_ids[] = { |
Kuninori Morimoto | 043a3f1 | 2013-10-21 01:04:32 -0700 | [diff] [blame] | 570 | { .compatible = "renesas,i2c-rcar", .data = (void *)I2C_RCAR_GEN1 }, |
| 571 | { .compatible = "renesas,i2c-r8a7778", .data = (void *)I2C_RCAR_GEN1 }, |
| 572 | { .compatible = "renesas,i2c-r8a7779", .data = (void *)I2C_RCAR_GEN1 }, |
| 573 | { .compatible = "renesas,i2c-r8a7790", .data = (void *)I2C_RCAR_GEN2 }, |
Wolfram Sang | e893645 | 2014-02-20 09:03:20 +0100 | [diff] [blame] | 574 | { .compatible = "renesas,i2c-r8a7791", .data = (void *)I2C_RCAR_GEN2 }, |
Wolfram Sang | 819a395 | 2014-05-27 14:06:28 +0200 | [diff] [blame] | 575 | { .compatible = "renesas,i2c-r8a7792", .data = (void *)I2C_RCAR_GEN2 }, |
| 576 | { .compatible = "renesas,i2c-r8a7793", .data = (void *)I2C_RCAR_GEN2 }, |
| 577 | { .compatible = "renesas,i2c-r8a7794", .data = (void *)I2C_RCAR_GEN2 }, |
Wolfram Sang | e7db0d3 | 2015-08-05 15:18:25 +0200 | [diff] [blame^] | 578 | { .compatible = "renesas,i2c-r8a7795", .data = (void *)I2C_RCAR_GEN3 }, |
Guennadi Liakhovetski | 7679c0e | 2013-09-12 14:36:46 +0200 | [diff] [blame] | 579 | {}, |
| 580 | }; |
| 581 | MODULE_DEVICE_TABLE(of, rcar_i2c_dt_ids); |
| 582 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 583 | static int rcar_i2c_probe(struct platform_device *pdev) |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 584 | { |
Jingoo Han | 6d4028c | 2013-07-30 16:59:33 +0900 | [diff] [blame] | 585 | struct i2c_rcar_platform_data *pdata = dev_get_platdata(&pdev->dev); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 586 | struct rcar_i2c_priv *priv; |
| 587 | struct i2c_adapter *adap; |
| 588 | struct resource *res; |
| 589 | struct device *dev = &pdev->dev; |
| 590 | u32 bus_speed; |
Wolfram Sang | 93e953d | 2014-05-28 09:44:37 +0200 | [diff] [blame] | 591 | int irq, ret; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 592 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 593 | priv = devm_kzalloc(dev, sizeof(struct rcar_i2c_priv), GFP_KERNEL); |
Jingoo Han | 46797a2 | 2014-05-13 10:51:58 +0900 | [diff] [blame] | 594 | if (!priv) |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 595 | return -ENOMEM; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 596 | |
Ben Dooks | bc8120f | 2014-01-26 16:05:35 +0000 | [diff] [blame] | 597 | priv->clk = devm_clk_get(dev, NULL); |
| 598 | if (IS_ERR(priv->clk)) { |
| 599 | dev_err(dev, "cannot get clock\n"); |
| 600 | return PTR_ERR(priv->clk); |
| 601 | } |
| 602 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 603 | bus_speed = 100000; /* default 100 kHz */ |
Guennadi Liakhovetski | 7679c0e | 2013-09-12 14:36:46 +0200 | [diff] [blame] | 604 | ret = of_property_read_u32(dev->of_node, "clock-frequency", &bus_speed); |
| 605 | if (ret < 0 && pdata && pdata->bus_speed) |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 606 | bus_speed = pdata->bus_speed; |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 607 | |
Guennadi Liakhovetski | 7679c0e | 2013-09-12 14:36:46 +0200 | [diff] [blame] | 608 | if (pdev->dev.of_node) |
| 609 | priv->devtype = (long)of_match_device(rcar_i2c_dt_ids, |
| 610 | dev)->data; |
| 611 | else |
| 612 | priv->devtype = platform_get_device_id(pdev)->driver_data; |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 613 | |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 614 | ret = rcar_i2c_clock_calculate(priv, bus_speed, dev); |
| 615 | if (ret < 0) |
| 616 | return ret; |
| 617 | |
Wolfram Sang | 3cc2d00 | 2013-05-10 10:16:54 +0200 | [diff] [blame] | 618 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Thierry Reding | 84dbf80 | 2013-01-21 11:09:03 +0100 | [diff] [blame] | 619 | priv->io = devm_ioremap_resource(dev, res); |
| 620 | if (IS_ERR(priv->io)) |
| 621 | return PTR_ERR(priv->io); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 622 | |
Wolfram Sang | 93c659d | 2015-09-03 22:20:05 +0200 | [diff] [blame] | 623 | rcar_i2c_init(priv); |
| 624 | |
Wolfram Sang | 93e953d | 2014-05-28 09:44:37 +0200 | [diff] [blame] | 625 | irq = platform_get_irq(pdev, 0); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 626 | init_waitqueue_head(&priv->wait); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 627 | |
Wolfram Sang | 929e3aba | 2014-07-10 13:46:31 +0200 | [diff] [blame] | 628 | adap = &priv->adap; |
| 629 | adap->nr = pdev->id; |
| 630 | adap->algo = &rcar_i2c_algo; |
| 631 | adap->class = I2C_CLASS_DEPRECATED; |
| 632 | adap->retries = 3; |
| 633 | adap->dev.parent = dev; |
| 634 | adap->dev.of_node = dev->of_node; |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 635 | i2c_set_adapdata(adap, priv); |
| 636 | strlcpy(adap->name, pdev->name, sizeof(adap->name)); |
| 637 | |
Wolfram Sang | 93e953d | 2014-05-28 09:44:37 +0200 | [diff] [blame] | 638 | ret = devm_request_irq(dev, irq, rcar_i2c_irq, 0, |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 639 | dev_name(dev), priv); |
| 640 | if (ret < 0) { |
Wolfram Sang | 93e953d | 2014-05-28 09:44:37 +0200 | [diff] [blame] | 641 | dev_err(dev, "cannot get irq %d\n", irq); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 642 | return ret; |
| 643 | } |
| 644 | |
| 645 | ret = i2c_add_numbered_adapter(adap); |
| 646 | if (ret < 0) { |
| 647 | dev_err(dev, "reg adap failed: %d\n", ret); |
| 648 | return ret; |
| 649 | } |
| 650 | |
| 651 | pm_runtime_enable(dev); |
| 652 | platform_set_drvdata(pdev, priv); |
| 653 | |
| 654 | dev_info(dev, "probed\n"); |
| 655 | |
| 656 | return 0; |
| 657 | } |
| 658 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 659 | static int rcar_i2c_remove(struct platform_device *pdev) |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 660 | { |
| 661 | struct rcar_i2c_priv *priv = platform_get_drvdata(pdev); |
| 662 | struct device *dev = &pdev->dev; |
| 663 | |
| 664 | i2c_del_adapter(&priv->adap); |
| 665 | pm_runtime_disable(dev); |
| 666 | |
| 667 | return 0; |
| 668 | } |
| 669 | |
Krzysztof Kozlowski | e9a02a3 | 2015-05-02 00:54:25 +0900 | [diff] [blame] | 670 | static const struct platform_device_id rcar_i2c_id_table[] = { |
Kuninori Morimoto | 043a3f1 | 2013-10-21 01:04:32 -0700 | [diff] [blame] | 671 | { "i2c-rcar", I2C_RCAR_GEN1 }, |
| 672 | { "i2c-rcar_gen1", I2C_RCAR_GEN1 }, |
| 673 | { "i2c-rcar_gen2", I2C_RCAR_GEN2 }, |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 674 | {}, |
| 675 | }; |
| 676 | MODULE_DEVICE_TABLE(platform, rcar_i2c_id_table); |
| 677 | |
Wolfram Sang | 45fd5e4 | 2012-11-13 11:24:15 +0100 | [diff] [blame] | 678 | static struct platform_driver rcar_i2c_driver = { |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 679 | .driver = { |
| 680 | .name = "i2c-rcar", |
Guennadi Liakhovetski | 7679c0e | 2013-09-12 14:36:46 +0200 | [diff] [blame] | 681 | .of_match_table = rcar_i2c_dt_ids, |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 682 | }, |
| 683 | .probe = rcar_i2c_probe, |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 684 | .remove = rcar_i2c_remove, |
Nguyen Viet Dung | b720423 | 2013-09-03 09:09:25 +0900 | [diff] [blame] | 685 | .id_table = rcar_i2c_id_table, |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 686 | }; |
| 687 | |
Wolfram Sang | 45fd5e4 | 2012-11-13 11:24:15 +0100 | [diff] [blame] | 688 | module_platform_driver(rcar_i2c_driver); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 689 | |
Wolfram Sang | 3d99bea | 2014-05-28 09:44:46 +0200 | [diff] [blame] | 690 | MODULE_LICENSE("GPL v2"); |
Kuninori Morimoto | 6ccbe60 | 2012-09-27 23:44:25 -0700 | [diff] [blame] | 691 | MODULE_DESCRIPTION("Renesas R-Car I2C bus driver"); |
| 692 | MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); |