Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1 | /* |
| 2 | * TI OMAP I2C master mode driver |
| 3 | * |
| 4 | * Copyright (C) 2003 MontaVista Software, Inc. |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 5 | * Copyright (C) 2005 Nokia Corporation |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 6 | * Copyright (C) 2004 - 2007 Texas Instruments. |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 7 | * |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 8 | * Originally written by MontaVista Software, Inc. |
| 9 | * Additional contributions by: |
| 10 | * Tony Lindgren <tony@atomide.com> |
| 11 | * Imre Deak <imre.deak@nokia.com> |
| 12 | * Juha Yrjölä <juha.yrjola@solidboot.com> |
| 13 | * Syed Khasim <x0khasim@ti.com> |
| 14 | * Nishant Menon <nm@ti.com> |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License as published by |
| 18 | * the Free Software Foundation; either version 2 of the License, or |
| 19 | * (at your option) any later version. |
| 20 | * |
| 21 | * This program is distributed in the hope that it will be useful, |
| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 24 | * GNU General Public License for more details. |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 25 | */ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/i2c.h> |
| 30 | #include <linux/err.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/completion.h> |
| 33 | #include <linux/platform_device.h> |
| 34 | #include <linux/clk.h> |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 35 | #include <linux/io.h> |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 36 | #include <linux/of.h> |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 37 | #include <linux/of_device.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 38 | #include <linux/slab.h> |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 39 | #include <linux/i2c-omap.h> |
Rajendra Nayak | 27b1fec | 2010-09-28 21:02:58 +0530 | [diff] [blame] | 40 | #include <linux/pm_runtime.h> |
Pascal Huerst | 096ea30 | 2015-05-06 15:07:04 +0200 | [diff] [blame^] | 41 | #include <linux/pinctrl/consumer.h> |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 42 | |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 43 | /* I2C controller revisions */ |
Andy Green | 4e80f72 | 2011-05-30 07:43:07 -0700 | [diff] [blame] | 44 | #define OMAP_I2C_OMAP1_REV_2 0x20 |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 45 | |
| 46 | /* I2C controller revisions present on specific hardware */ |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 47 | #define OMAP_I2C_REV_ON_2430 0x00000036 |
| 48 | #define OMAP_I2C_REV_ON_3430_3530 0x0000003C |
| 49 | #define OMAP_I2C_REV_ON_3630 0x00000040 |
| 50 | #define OMAP_I2C_REV_ON_4430_PLUS 0x50400002 |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 51 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 52 | /* timeout waiting for the controller to respond */ |
| 53 | #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) |
| 54 | |
Felipe Balbi | 6d8451d | 2012-09-12 16:28:15 +0530 | [diff] [blame] | 55 | /* timeout for pm runtime autosuspend */ |
| 56 | #define OMAP_I2C_PM_TIMEOUT 1000 /* ms */ |
| 57 | |
Alexander Kochetkov | 0f5768b | 2014-11-22 23:47:12 +0400 | [diff] [blame] | 58 | /* timeout for making decision on bus free status */ |
| 59 | #define OMAP_I2C_BUS_FREE_TIMEOUT (msecs_to_jiffies(10)) |
| 60 | |
Kalle Jokiniemi | 5043e9e7 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 61 | /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */ |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 62 | enum { |
| 63 | OMAP_I2C_REV_REG = 0, |
| 64 | OMAP_I2C_IE_REG, |
| 65 | OMAP_I2C_STAT_REG, |
| 66 | OMAP_I2C_IV_REG, |
| 67 | OMAP_I2C_WE_REG, |
| 68 | OMAP_I2C_SYSS_REG, |
| 69 | OMAP_I2C_BUF_REG, |
| 70 | OMAP_I2C_CNT_REG, |
| 71 | OMAP_I2C_DATA_REG, |
| 72 | OMAP_I2C_SYSC_REG, |
| 73 | OMAP_I2C_CON_REG, |
| 74 | OMAP_I2C_OA_REG, |
| 75 | OMAP_I2C_SA_REG, |
| 76 | OMAP_I2C_PSC_REG, |
| 77 | OMAP_I2C_SCLL_REG, |
| 78 | OMAP_I2C_SCLH_REG, |
| 79 | OMAP_I2C_SYSTEST_REG, |
| 80 | OMAP_I2C_BUFSTAT_REG, |
Andy Green | b885308 | 2011-05-30 07:43:04 -0700 | [diff] [blame] | 81 | /* only on OMAP4430 */ |
| 82 | OMAP_I2C_IP_V2_REVNB_LO, |
| 83 | OMAP_I2C_IP_V2_REVNB_HI, |
| 84 | OMAP_I2C_IP_V2_IRQSTATUS_RAW, |
| 85 | OMAP_I2C_IP_V2_IRQENABLE_SET, |
| 86 | OMAP_I2C_IP_V2_IRQENABLE_CLR, |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 87 | }; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 88 | |
| 89 | /* I2C Interrupt Enable Register (OMAP_I2C_IE): */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 90 | #define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */ |
| 91 | #define OMAP_I2C_IE_RDR (1 << 13) /* RX Buffer drain int enable */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 92 | #define OMAP_I2C_IE_XRDY (1 << 4) /* TX data ready int enable */ |
| 93 | #define OMAP_I2C_IE_RRDY (1 << 3) /* RX data ready int enable */ |
| 94 | #define OMAP_I2C_IE_ARDY (1 << 2) /* Access ready int enable */ |
| 95 | #define OMAP_I2C_IE_NACK (1 << 1) /* No ack interrupt enable */ |
| 96 | #define OMAP_I2C_IE_AL (1 << 0) /* Arbitration lost int ena */ |
| 97 | |
| 98 | /* I2C Status Register (OMAP_I2C_STAT): */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 99 | #define OMAP_I2C_STAT_XDR (1 << 14) /* TX Buffer draining */ |
| 100 | #define OMAP_I2C_STAT_RDR (1 << 13) /* RX Buffer draining */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 101 | #define OMAP_I2C_STAT_BB (1 << 12) /* Bus busy */ |
| 102 | #define OMAP_I2C_STAT_ROVR (1 << 11) /* Receive overrun */ |
| 103 | #define OMAP_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */ |
| 104 | #define OMAP_I2C_STAT_AAS (1 << 9) /* Address as slave */ |
Alexander Kochetkov | 9fd6ada | 2014-11-22 23:47:11 +0400 | [diff] [blame] | 105 | #define OMAP_I2C_STAT_BF (1 << 8) /* Bus Free */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 106 | #define OMAP_I2C_STAT_XRDY (1 << 4) /* Transmit data ready */ |
| 107 | #define OMAP_I2C_STAT_RRDY (1 << 3) /* Receive data ready */ |
| 108 | #define OMAP_I2C_STAT_ARDY (1 << 2) /* Register access ready */ |
| 109 | #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */ |
| 110 | #define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */ |
| 111 | |
Kalle Jokiniemi | 5043e9e7 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 112 | /* I2C WE wakeup enable register */ |
| 113 | #define OMAP_I2C_WE_XDR_WE (1 << 14) /* TX drain wakup */ |
| 114 | #define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */ |
| 115 | #define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/ |
| 116 | #define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */ |
| 117 | #define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */ |
| 118 | #define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */ |
| 119 | #define OMAP_I2C_WE_DRDY_WE (1 << 3) /* TX/RX data ready wakeup */ |
| 120 | #define OMAP_I2C_WE_ARDY_WE (1 << 2) /* Reg access ready wakeup */ |
| 121 | #define OMAP_I2C_WE_NACK_WE (1 << 1) /* No acknowledgment wakeup */ |
| 122 | #define OMAP_I2C_WE_AL_WE (1 << 0) /* Arbitration lost wakeup */ |
| 123 | |
| 124 | #define OMAP_I2C_WE_ALL (OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \ |
| 125 | OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \ |
| 126 | OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \ |
| 127 | OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \ |
| 128 | OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE) |
| 129 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 130 | /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */ |
| 131 | #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 132 | #define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 133 | #define OMAP_I2C_BUF_XDMA_EN (1 << 7) /* TX DMA channel enable */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 134 | #define OMAP_I2C_BUF_TXFIF_CLR (1 << 6) /* TX FIFO Clear */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 135 | |
| 136 | /* I2C Configuration Register (OMAP_I2C_CON): */ |
| 137 | #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */ |
| 138 | #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 139 | #define OMAP_I2C_CON_OPMODE_HS (1 << 12) /* High Speed support */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 140 | #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */ |
| 141 | #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */ |
| 142 | #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */ |
| 143 | #define OMAP_I2C_CON_XA (1 << 8) /* Expand address */ |
| 144 | #define OMAP_I2C_CON_RM (1 << 2) /* Repeat mode (master only) */ |
| 145 | #define OMAP_I2C_CON_STP (1 << 1) /* Stop cond (master only) */ |
| 146 | #define OMAP_I2C_CON_STT (1 << 0) /* Start condition (master) */ |
| 147 | |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 148 | /* I2C SCL time value when Master */ |
| 149 | #define OMAP_I2C_SCLL_HSSCLL 8 |
| 150 | #define OMAP_I2C_SCLH_HSSCLH 8 |
| 151 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 152 | /* I2C System Test Register (OMAP_I2C_SYSTEST): */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 153 | #define OMAP_I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */ |
| 154 | #define OMAP_I2C_SYSTEST_FREE (1 << 14) /* Free running mode */ |
| 155 | #define OMAP_I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */ |
| 156 | #define OMAP_I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */ |
Alexander Kochetkov | 9fd6ada | 2014-11-22 23:47:11 +0400 | [diff] [blame] | 157 | /* Functional mode */ |
| 158 | #define OMAP_I2C_SYSTEST_SCL_I_FUNC (1 << 8) /* SCL line input value */ |
| 159 | #define OMAP_I2C_SYSTEST_SCL_O_FUNC (1 << 7) /* SCL line output value */ |
| 160 | #define OMAP_I2C_SYSTEST_SDA_I_FUNC (1 << 6) /* SDA line input value */ |
| 161 | #define OMAP_I2C_SYSTEST_SDA_O_FUNC (1 << 5) /* SDA line output value */ |
| 162 | /* SDA/SCL IO mode */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 163 | #define OMAP_I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense in */ |
| 164 | #define OMAP_I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive out */ |
| 165 | #define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */ |
| 166 | #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 167 | |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 168 | /* OCP_SYSSTATUS bit definitions */ |
| 169 | #define SYSS_RESETDONE_MASK (1 << 0) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 170 | |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 171 | /* OCP_SYSCONFIG bit definitions */ |
| 172 | #define SYSC_CLOCKACTIVITY_MASK (0x3 << 8) |
| 173 | #define SYSC_SIDLEMODE_MASK (0x3 << 3) |
| 174 | #define SYSC_ENAWAKEUP_MASK (1 << 2) |
| 175 | #define SYSC_SOFTRESET_MASK (1 << 1) |
| 176 | #define SYSC_AUTOIDLE_MASK (1 << 0) |
| 177 | |
| 178 | #define SYSC_IDLEMODE_SMART 0x2 |
| 179 | #define SYSC_CLOCKACTIVITY_FCLK 0x2 |
| 180 | |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 181 | /* Errata definitions */ |
| 182 | #define I2C_OMAP_ERRATA_I207 (1 << 0) |
Shubhrajyoti D | c8db38f | 2012-05-29 16:26:22 +0530 | [diff] [blame] | 183 | #define I2C_OMAP_ERRATA_I462 (1 << 1) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 184 | |
Oleksandr Dmytryshyn | 4368de1 | 2013-06-03 10:37:20 +0300 | [diff] [blame] | 185 | #define OMAP_I2C_IP_V2_INTERRUPTS_MASK 0x6FFF |
| 186 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 187 | struct omap_i2c_dev { |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame] | 188 | spinlock_t lock; /* IRQ synchronization */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 189 | struct device *dev; |
| 190 | void __iomem *base; /* virtual */ |
| 191 | int irq; |
Cory Maccarrone | d84d3ea | 2009-12-12 17:54:02 -0800 | [diff] [blame] | 192 | int reg_shift; /* bit shift for I2C register addresses */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 193 | struct completion cmd_complete; |
| 194 | struct resource *ioarea; |
Paul Walmsley | 49839dc | 2012-11-06 16:31:32 +0000 | [diff] [blame] | 195 | u32 latency; /* maximum mpu wkup latency */ |
| 196 | void (*set_mpu_wkup_lat)(struct device *dev, |
| 197 | long latency); |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 198 | u32 speed; /* Speed of bus in kHz */ |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 199 | u32 flags; |
Oleksandr Dmytryshyn | 4368de1 | 2013-06-03 10:37:20 +0300 | [diff] [blame] | 200 | u16 scheme; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 201 | u16 cmd_err; |
| 202 | u8 *buf; |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 203 | u8 *regs; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 204 | size_t buf_len; |
| 205 | struct i2c_adapter adapter; |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 206 | u8 threshold; |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 207 | u8 fifo_size; /* use as flag and value |
| 208 | * fifo_size==0 implies no fifo |
| 209 | * if set, should be trsh+1 |
| 210 | */ |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 211 | u32 rev; |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 212 | unsigned b_hw:1; /* bad h/w fixes */ |
Alexander Kochetkov | 0f5768b | 2014-11-22 23:47:12 +0400 | [diff] [blame] | 213 | unsigned bb_valid:1; /* true when BB-bit reflects |
| 214 | * the I2C bus state |
| 215 | */ |
Felipe Balbi | 079d8af | 2012-09-12 16:28:06 +0530 | [diff] [blame] | 216 | unsigned receiver:1; /* true when we're in receiver mode */ |
Tony Lindgren | f08ac4e | 2008-03-23 20:28:20 +0100 | [diff] [blame] | 217 | u16 iestate; /* Saved interrupt register */ |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 218 | u16 pscstate; |
| 219 | u16 scllstate; |
| 220 | u16 sclhstate; |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 221 | u16 syscstate; |
| 222 | u16 westate; |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 223 | u16 errata; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 224 | }; |
| 225 | |
Andy Green | a129557 | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 226 | static const u8 reg_map_ip_v1[] = { |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 227 | [OMAP_I2C_REV_REG] = 0x00, |
| 228 | [OMAP_I2C_IE_REG] = 0x01, |
| 229 | [OMAP_I2C_STAT_REG] = 0x02, |
| 230 | [OMAP_I2C_IV_REG] = 0x03, |
| 231 | [OMAP_I2C_WE_REG] = 0x03, |
| 232 | [OMAP_I2C_SYSS_REG] = 0x04, |
| 233 | [OMAP_I2C_BUF_REG] = 0x05, |
| 234 | [OMAP_I2C_CNT_REG] = 0x06, |
| 235 | [OMAP_I2C_DATA_REG] = 0x07, |
| 236 | [OMAP_I2C_SYSC_REG] = 0x08, |
| 237 | [OMAP_I2C_CON_REG] = 0x09, |
| 238 | [OMAP_I2C_OA_REG] = 0x0a, |
| 239 | [OMAP_I2C_SA_REG] = 0x0b, |
| 240 | [OMAP_I2C_PSC_REG] = 0x0c, |
| 241 | [OMAP_I2C_SCLL_REG] = 0x0d, |
| 242 | [OMAP_I2C_SCLH_REG] = 0x0e, |
| 243 | [OMAP_I2C_SYSTEST_REG] = 0x0f, |
| 244 | [OMAP_I2C_BUFSTAT_REG] = 0x10, |
| 245 | }; |
| 246 | |
Andy Green | a129557 | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 247 | static const u8 reg_map_ip_v2[] = { |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 248 | [OMAP_I2C_REV_REG] = 0x04, |
| 249 | [OMAP_I2C_IE_REG] = 0x2c, |
| 250 | [OMAP_I2C_STAT_REG] = 0x28, |
| 251 | [OMAP_I2C_IV_REG] = 0x34, |
| 252 | [OMAP_I2C_WE_REG] = 0x34, |
| 253 | [OMAP_I2C_SYSS_REG] = 0x90, |
| 254 | [OMAP_I2C_BUF_REG] = 0x94, |
| 255 | [OMAP_I2C_CNT_REG] = 0x98, |
| 256 | [OMAP_I2C_DATA_REG] = 0x9c, |
Alexander Aring | 2727b17 | 2011-12-08 15:43:53 +0100 | [diff] [blame] | 257 | [OMAP_I2C_SYSC_REG] = 0x10, |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 258 | [OMAP_I2C_CON_REG] = 0xa4, |
| 259 | [OMAP_I2C_OA_REG] = 0xa8, |
| 260 | [OMAP_I2C_SA_REG] = 0xac, |
| 261 | [OMAP_I2C_PSC_REG] = 0xb0, |
| 262 | [OMAP_I2C_SCLL_REG] = 0xb4, |
| 263 | [OMAP_I2C_SCLH_REG] = 0xb8, |
| 264 | [OMAP_I2C_SYSTEST_REG] = 0xbC, |
| 265 | [OMAP_I2C_BUFSTAT_REG] = 0xc0, |
Andy Green | b885308 | 2011-05-30 07:43:04 -0700 | [diff] [blame] | 266 | [OMAP_I2C_IP_V2_REVNB_LO] = 0x00, |
| 267 | [OMAP_I2C_IP_V2_REVNB_HI] = 0x04, |
| 268 | [OMAP_I2C_IP_V2_IRQSTATUS_RAW] = 0x24, |
| 269 | [OMAP_I2C_IP_V2_IRQENABLE_SET] = 0x2c, |
| 270 | [OMAP_I2C_IP_V2_IRQENABLE_CLR] = 0x30, |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 271 | }; |
| 272 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 273 | static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev, |
| 274 | int reg, u16 val) |
| 275 | { |
Victor Kamensky | 40b13ca | 2013-11-27 15:48:08 +0200 | [diff] [blame] | 276 | writew_relaxed(val, i2c_dev->base + |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 277 | (i2c_dev->regs[reg] << i2c_dev->reg_shift)); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) |
| 281 | { |
Victor Kamensky | 40b13ca | 2013-11-27 15:48:08 +0200 | [diff] [blame] | 282 | return readw_relaxed(i2c_dev->base + |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 283 | (i2c_dev->regs[reg] << i2c_dev->reg_shift)); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 284 | } |
| 285 | |
Shubhrajyoti D | 95dd303 | 2012-11-05 17:53:40 +0530 | [diff] [blame] | 286 | static void __omap_i2c_init(struct omap_i2c_dev *dev) |
| 287 | { |
| 288 | |
| 289 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
| 290 | |
| 291 | /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */ |
| 292 | omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate); |
| 293 | |
| 294 | /* SCL low and high time values */ |
| 295 | omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate); |
| 296 | omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, dev->sclhstate); |
| 297 | if (dev->rev >= OMAP_I2C_REV_ON_3430_3530) |
| 298 | omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate); |
| 299 | |
| 300 | /* Take the I2C module out of reset: */ |
| 301 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); |
| 302 | |
| 303 | /* |
Alexander Kochetkov | 4f734a3 | 2014-11-22 23:47:14 +0400 | [diff] [blame] | 304 | * NOTE: right after setting CON_EN, STAT_BB could be 0 while the |
| 305 | * bus is busy. It will be changed to 1 on the next IP FCLK clock. |
| 306 | * udelay(1) will be enough to fix that. |
| 307 | */ |
| 308 | |
| 309 | /* |
Shubhrajyoti D | 95dd303 | 2012-11-05 17:53:40 +0530 | [diff] [blame] | 310 | * Don't write to this register if the IE state is 0 as it can |
| 311 | * cause deadlock. |
| 312 | */ |
| 313 | if (dev->iestate) |
| 314 | omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); |
| 315 | } |
| 316 | |
Shubhrajyoti D | d6c842a | 2012-11-05 17:53:41 +0530 | [diff] [blame] | 317 | static int omap_i2c_reset(struct omap_i2c_dev *dev) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 318 | { |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 319 | unsigned long timeout; |
Shubhrajyoti D | ca85e24 | 2012-11-05 17:53:43 +0530 | [diff] [blame] | 320 | u16 sysc; |
| 321 | |
Andy Green | 4e80f72 | 2011-05-30 07:43:07 -0700 | [diff] [blame] | 322 | if (dev->rev >= OMAP_I2C_OMAP1_REV_2) { |
Shubhrajyoti D | ca85e24 | 2012-11-05 17:53:43 +0530 | [diff] [blame] | 323 | sysc = omap_i2c_read_reg(dev, OMAP_I2C_SYSC_REG); |
| 324 | |
Manjunatha GK | 57eb81b | 2009-12-11 11:09:08 +0530 | [diff] [blame] | 325 | /* Disable I2C controller before soft reset */ |
| 326 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, |
| 327 | omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) & |
| 328 | ~(OMAP_I2C_CON_EN)); |
| 329 | |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 330 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 331 | /* For some reason we need to set the EN bit before the |
| 332 | * reset done bit gets set. */ |
| 333 | timeout = jiffies + OMAP_I2C_TIMEOUT; |
| 334 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); |
| 335 | while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) & |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 336 | SYSS_RESETDONE_MASK)) { |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 337 | if (time_after(jiffies, timeout)) { |
Joe Perches | fce3ff0 | 2007-12-12 13:45:24 +0100 | [diff] [blame] | 338 | dev_warn(dev->dev, "timeout waiting " |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 339 | "for controller reset\n"); |
| 340 | return -ETIMEDOUT; |
| 341 | } |
| 342 | msleep(1); |
| 343 | } |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 344 | |
| 345 | /* SYSC register is cleared by the reset; rewrite it */ |
Shubhrajyoti D | ca85e24 | 2012-11-05 17:53:43 +0530 | [diff] [blame] | 346 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, sysc); |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 347 | |
Alexander Kochetkov | 23173ea | 2014-11-25 02:20:55 +0400 | [diff] [blame] | 348 | if (dev->rev > OMAP_I2C_REV_ON_3430_3530) { |
| 349 | /* Schedule I2C-bus monitoring on the next transfer */ |
| 350 | dev->bb_valid = 0; |
| 351 | } |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 352 | } |
Alexander Kochetkov | 0f5768b | 2014-11-22 23:47:12 +0400 | [diff] [blame] | 353 | |
Shubhrajyoti D | d6c842a | 2012-11-05 17:53:41 +0530 | [diff] [blame] | 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | static int omap_i2c_init(struct omap_i2c_dev *dev) |
| 358 | { |
| 359 | u16 psc = 0, scll = 0, sclh = 0; |
| 360 | u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0; |
| 361 | unsigned long fclk_rate = 12000000; |
| 362 | unsigned long internal_clk = 0; |
| 363 | struct clk *fclk; |
| 364 | |
| 365 | if (dev->rev >= OMAP_I2C_REV_ON_3430_3530) { |
| 366 | /* |
| 367 | * Enabling all wakup sources to stop I2C freezing on |
| 368 | * WFI instruction. |
| 369 | * REVISIT: Some wkup sources might not be needed. |
| 370 | */ |
| 371 | dev->westate = OMAP_I2C_WE_ALL; |
| 372 | } |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 373 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 374 | if (dev->flags & OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK) { |
Russell King | 0e9ae10 | 2009-01-22 19:31:46 +0000 | [diff] [blame] | 375 | /* |
| 376 | * The I2C functional clock is the armxor_ck, so there's |
| 377 | * no need to get "armxor_ck" separately. Now, if OMAP2420 |
| 378 | * always returns 12MHz for the functional clock, we can |
| 379 | * do this bit unconditionally. |
| 380 | */ |
Rajendra Nayak | 27b1fec | 2010-09-28 21:02:58 +0530 | [diff] [blame] | 381 | fclk = clk_get(dev->dev, "fck"); |
| 382 | fclk_rate = clk_get_rate(fclk); |
| 383 | clk_put(fclk); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 384 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 385 | /* TRM for 5912 says the I2C clock must be prescaled to be |
| 386 | * between 7 - 12 MHz. The XOR input clock is typically |
| 387 | * 12, 13 or 19.2 MHz. So we should have code that produces: |
| 388 | * |
| 389 | * XOR MHz Divider Prescaler |
| 390 | * 12 1 0 |
| 391 | * 13 2 1 |
| 392 | * 19.2 2 1 |
| 393 | */ |
Jean Delvare | d7aef13 | 2006-12-10 21:21:34 +0100 | [diff] [blame] | 394 | if (fclk_rate > 12000000) |
| 395 | psc = fclk_rate / 12000000; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 396 | } |
| 397 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 398 | if (!(dev->flags & OMAP_I2C_FLAG_SIMPLE_CLOCK)) { |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 399 | |
Aaro Koskinen | 84bf2c8 | 2009-05-27 17:54:46 +0300 | [diff] [blame] | 400 | /* |
| 401 | * HSI2C controller internal clk rate should be 19.2 Mhz for |
| 402 | * HS and for all modes on 2430. On 34xx we can use lower rate |
| 403 | * to get longer filter period for better noise suppression. |
| 404 | * The filter is iclk (fclk for HS) period. |
| 405 | */ |
Andy Green | 3be0053 | 2011-05-30 07:43:09 -0700 | [diff] [blame] | 406 | if (dev->speed > 400 || |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 407 | dev->flags & OMAP_I2C_FLAG_FORCE_19200_INT_CLK) |
Aaro Koskinen | 84bf2c8 | 2009-05-27 17:54:46 +0300 | [diff] [blame] | 408 | internal_clk = 19200; |
| 409 | else if (dev->speed > 100) |
| 410 | internal_clk = 9600; |
| 411 | else |
| 412 | internal_clk = 4000; |
Rajendra Nayak | 27b1fec | 2010-09-28 21:02:58 +0530 | [diff] [blame] | 413 | fclk = clk_get(dev->dev, "fck"); |
| 414 | fclk_rate = clk_get_rate(fclk) / 1000; |
| 415 | clk_put(fclk); |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 416 | |
| 417 | /* Compute prescaler divisor */ |
| 418 | psc = fclk_rate / internal_clk; |
| 419 | psc = psc - 1; |
| 420 | |
| 421 | /* If configured for High Speed */ |
| 422 | if (dev->speed > 400) { |
Aaro Koskinen | baf46b4 | 2009-05-27 17:54:45 +0300 | [diff] [blame] | 423 | unsigned long scl; |
| 424 | |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 425 | /* For first phase of HS mode */ |
Aaro Koskinen | baf46b4 | 2009-05-27 17:54:45 +0300 | [diff] [blame] | 426 | scl = internal_clk / 400; |
| 427 | fsscll = scl - (scl / 3) - 7; |
| 428 | fssclh = (scl / 3) - 5; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 429 | |
| 430 | /* For second phase of HS mode */ |
Aaro Koskinen | baf46b4 | 2009-05-27 17:54:45 +0300 | [diff] [blame] | 431 | scl = fclk_rate / dev->speed; |
| 432 | hsscll = scl - (scl / 3) - 7; |
| 433 | hssclh = (scl / 3) - 5; |
| 434 | } else if (dev->speed > 100) { |
| 435 | unsigned long scl; |
| 436 | |
| 437 | /* Fast mode */ |
| 438 | scl = internal_clk / dev->speed; |
| 439 | fsscll = scl - (scl / 3) - 7; |
| 440 | fssclh = (scl / 3) - 5; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 441 | } else { |
Aaro Koskinen | baf46b4 | 2009-05-27 17:54:45 +0300 | [diff] [blame] | 442 | /* Standard mode */ |
| 443 | fsscll = internal_clk / (dev->speed * 2) - 7; |
| 444 | fssclh = internal_clk / (dev->speed * 2) - 5; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 445 | } |
| 446 | scll = (hsscll << OMAP_I2C_SCLL_HSSCLL) | fsscll; |
| 447 | sclh = (hssclh << OMAP_I2C_SCLH_HSSCLH) | fssclh; |
| 448 | } else { |
| 449 | /* Program desired operating rate */ |
| 450 | fclk_rate /= (psc + 1) * 1000; |
| 451 | if (psc > 2) |
| 452 | psc = 2; |
| 453 | scll = fclk_rate / (dev->speed * 2) - 7 + psc; |
| 454 | sclh = fclk_rate / (dev->speed * 2) - 7 + psc; |
| 455 | } |
| 456 | |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 457 | dev->iestate = (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY | |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 458 | OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK | |
| 459 | OMAP_I2C_IE_AL) | ((dev->fifo_size) ? |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 460 | (OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0); |
Shubhrajyoti D | 95dd303 | 2012-11-05 17:53:40 +0530 | [diff] [blame] | 461 | |
| 462 | dev->pscstate = psc; |
| 463 | dev->scllstate = scll; |
| 464 | dev->sclhstate = sclh; |
| 465 | |
Alexander Kochetkov | 23173ea | 2014-11-25 02:20:55 +0400 | [diff] [blame] | 466 | if (dev->rev <= OMAP_I2C_REV_ON_3430_3530) { |
Alexander Kochetkov | 0f5768b | 2014-11-22 23:47:12 +0400 | [diff] [blame] | 467 | /* Not implemented */ |
| 468 | dev->bb_valid = 1; |
| 469 | } |
| 470 | |
Shubhrajyoti D | 95dd303 | 2012-11-05 17:53:40 +0530 | [diff] [blame] | 471 | __omap_i2c_init(dev); |
| 472 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * Waiting on Bus Busy |
| 478 | */ |
| 479 | static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev) |
| 480 | { |
| 481 | unsigned long timeout; |
| 482 | |
| 483 | timeout = jiffies + OMAP_I2C_TIMEOUT; |
| 484 | while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) { |
| 485 | if (time_after(jiffies, timeout)) { |
| 486 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); |
| 487 | return -ETIMEDOUT; |
| 488 | } |
| 489 | msleep(1); |
| 490 | } |
| 491 | |
| 492 | return 0; |
| 493 | } |
| 494 | |
Alexander Kochetkov | 0f5768b | 2014-11-22 23:47:12 +0400 | [diff] [blame] | 495 | /* |
| 496 | * Wait while BB-bit doesn't reflect the I2C bus state |
| 497 | * |
| 498 | * In a multimaster environment, after IP software reset, BB-bit value doesn't |
| 499 | * correspond to the current bus state. It may happen what BB-bit will be 0, |
| 500 | * while the bus is busy due to another I2C master activity. |
| 501 | * Here are BB-bit values after reset: |
| 502 | * SDA SCL BB NOTES |
| 503 | * 0 0 0 1, 2 |
| 504 | * 1 0 0 1, 2 |
| 505 | * 0 1 1 |
| 506 | * 1 1 0 3 |
| 507 | * Later, if IP detect SDA=0 and SCL=1 (ACK) or SDA 1->0 while SCL=1 (START) |
| 508 | * combinations on the bus, it set BB-bit to 1. |
| 509 | * If IP detect SDA 0->1 while SCL=1 (STOP) combination on the bus, |
| 510 | * it set BB-bit to 0 and BF to 1. |
| 511 | * BB and BF bits correctly tracks the bus state while IP is suspended |
| 512 | * BB bit became valid on the next FCLK clock after CON_EN bit set |
| 513 | * |
| 514 | * NOTES: |
| 515 | * 1. Any transfer started when BB=0 and bus is busy wouldn't be |
| 516 | * completed by IP and results in controller timeout. |
| 517 | * 2. Any transfer started when BB=0 and SCL=0 results in IP |
| 518 | * starting to drive SDA low. In that case IP corrupt data |
| 519 | * on the bus. |
| 520 | * 3. Any transfer started in the middle of another master's transfer |
| 521 | * results in unpredictable results and data corruption |
| 522 | */ |
| 523 | static int omap_i2c_wait_for_bb_valid(struct omap_i2c_dev *dev) |
| 524 | { |
| 525 | unsigned long bus_free_timeout = 0; |
| 526 | unsigned long timeout; |
| 527 | int bus_free = 0; |
| 528 | u16 stat, systest; |
| 529 | |
| 530 | if (dev->bb_valid) |
| 531 | return 0; |
| 532 | |
| 533 | timeout = jiffies + OMAP_I2C_TIMEOUT; |
| 534 | while (1) { |
| 535 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); |
| 536 | /* |
| 537 | * We will see BB or BF event in a case IP had detected any |
| 538 | * activity on the I2C bus. Now IP correctly tracks the bus |
| 539 | * state. BB-bit value is valid. |
| 540 | */ |
| 541 | if (stat & (OMAP_I2C_STAT_BB | OMAP_I2C_STAT_BF)) |
| 542 | break; |
| 543 | |
| 544 | /* |
| 545 | * Otherwise, we must look signals on the bus to make |
| 546 | * the right decision. |
| 547 | */ |
| 548 | systest = omap_i2c_read_reg(dev, OMAP_I2C_SYSTEST_REG); |
| 549 | if ((systest & OMAP_I2C_SYSTEST_SCL_I_FUNC) && |
| 550 | (systest & OMAP_I2C_SYSTEST_SDA_I_FUNC)) { |
| 551 | if (!bus_free) { |
| 552 | bus_free_timeout = jiffies + |
| 553 | OMAP_I2C_BUS_FREE_TIMEOUT; |
| 554 | bus_free = 1; |
| 555 | } |
| 556 | |
| 557 | /* |
| 558 | * SDA and SCL lines was high for 10 ms without bus |
| 559 | * activity detected. The bus is free. Consider |
| 560 | * BB-bit value is valid. |
| 561 | */ |
| 562 | if (time_after(jiffies, bus_free_timeout)) |
| 563 | break; |
| 564 | } else { |
| 565 | bus_free = 0; |
| 566 | } |
| 567 | |
| 568 | if (time_after(jiffies, timeout)) { |
| 569 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); |
| 570 | return -ETIMEDOUT; |
| 571 | } |
| 572 | |
| 573 | msleep(1); |
| 574 | } |
| 575 | |
| 576 | dev->bb_valid = 1; |
| 577 | return 0; |
| 578 | } |
| 579 | |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 580 | static void omap_i2c_resize_fifo(struct omap_i2c_dev *dev, u8 size, bool is_rx) |
| 581 | { |
| 582 | u16 buf; |
| 583 | |
| 584 | if (dev->flags & OMAP_I2C_FLAG_NO_FIFO) |
| 585 | return; |
| 586 | |
| 587 | /* |
| 588 | * Set up notification threshold based on message size. We're doing |
| 589 | * this to try and avoid draining feature as much as possible. Whenever |
| 590 | * we have big messages to transfer (bigger than our total fifo size) |
| 591 | * then we might use draining feature to transfer the remaining bytes. |
| 592 | */ |
| 593 | |
| 594 | dev->threshold = clamp(size, (u8) 1, dev->fifo_size); |
| 595 | |
| 596 | buf = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG); |
| 597 | |
| 598 | if (is_rx) { |
| 599 | /* Clear RX Threshold */ |
| 600 | buf &= ~(0x3f << 8); |
| 601 | buf |= ((dev->threshold - 1) << 8) | OMAP_I2C_BUF_RXFIF_CLR; |
| 602 | } else { |
| 603 | /* Clear TX Threshold */ |
| 604 | buf &= ~0x3f; |
| 605 | buf |= (dev->threshold - 1) | OMAP_I2C_BUF_TXFIF_CLR; |
| 606 | } |
| 607 | |
| 608 | omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, buf); |
| 609 | |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 610 | if (dev->rev < OMAP_I2C_REV_ON_3630) |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 611 | dev->b_hw = 1; /* Enable hardware fixes */ |
| 612 | |
| 613 | /* calculate wakeup latency constraint for MPU */ |
Paul Walmsley | 49839dc | 2012-11-06 16:31:32 +0000 | [diff] [blame] | 614 | if (dev->set_mpu_wkup_lat != NULL) |
| 615 | dev->latency = (1000000 * dev->threshold) / |
| 616 | (1000 * dev->speed / 8); |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 617 | } |
| 618 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 619 | /* |
| 620 | * Low level master read/write transaction. |
| 621 | */ |
| 622 | static int omap_i2c_xfer_msg(struct i2c_adapter *adap, |
| 623 | struct i2c_msg *msg, int stop) |
| 624 | { |
| 625 | struct omap_i2c_dev *dev = i2c_get_adapdata(adap); |
Shubhrajyoti D | 33d5498 | 2012-05-29 16:26:17 +0530 | [diff] [blame] | 626 | unsigned long timeout; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 627 | u16 w; |
| 628 | |
| 629 | dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n", |
| 630 | msg->addr, msg->len, msg->flags, stop); |
| 631 | |
| 632 | if (msg->len == 0) |
| 633 | return -EINVAL; |
| 634 | |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 635 | dev->receiver = !!(msg->flags & I2C_M_RD); |
| 636 | omap_i2c_resize_fifo(dev, msg->len, dev->receiver); |
| 637 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 638 | omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr); |
| 639 | |
| 640 | /* REVISIT: Could the STB bit of I2C_CON be used with probing? */ |
| 641 | dev->buf = msg->buf; |
| 642 | dev->buf_len = msg->len; |
| 643 | |
Felipe Balbi | d60ece5 | 2012-11-14 16:22:45 +0200 | [diff] [blame] | 644 | /* make sure writes to dev->buf_len are ordered */ |
| 645 | barrier(); |
| 646 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 647 | omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len); |
| 648 | |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 649 | /* Clear the FIFO Buffers */ |
| 650 | w = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG); |
| 651 | w |= OMAP_I2C_BUF_RXFIF_CLR | OMAP_I2C_BUF_TXFIF_CLR; |
| 652 | omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, w); |
| 653 | |
Wolfram Sang | 16735d0 | 2013-11-14 14:32:02 -0800 | [diff] [blame] | 654 | reinit_completion(&dev->cmd_complete); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 655 | dev->cmd_err = 0; |
| 656 | |
| 657 | w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 658 | |
| 659 | /* High speed configuration */ |
| 660 | if (dev->speed > 400) |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 661 | w |= OMAP_I2C_CON_OPMODE_HS; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 662 | |
Laurent Pinchart | fb604a3 | 2012-07-24 14:13:59 +0200 | [diff] [blame] | 663 | if (msg->flags & I2C_M_STOP) |
| 664 | stop = 1; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 665 | if (msg->flags & I2C_M_TEN) |
| 666 | w |= OMAP_I2C_CON_XA; |
| 667 | if (!(msg->flags & I2C_M_RD)) |
| 668 | w |= OMAP_I2C_CON_TRX; |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 669 | |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 670 | if (!dev->b_hw && stop) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 671 | w |= OMAP_I2C_CON_STP; |
Alexander Kochetkov | 4f734a3 | 2014-11-22 23:47:14 +0400 | [diff] [blame] | 672 | /* |
| 673 | * NOTE: STAT_BB bit could became 1 here if another master occupy |
| 674 | * the bus. IP successfully complete transfer when the bus will be |
| 675 | * free again (BB reset to 0). |
| 676 | */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 677 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); |
| 678 | |
Jarkko Nikula | b7af349 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 679 | /* |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 680 | * Don't write stt and stp together on some hardware. |
| 681 | */ |
| 682 | if (dev->b_hw && stop) { |
| 683 | unsigned long delay = jiffies + OMAP_I2C_TIMEOUT; |
| 684 | u16 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); |
| 685 | while (con & OMAP_I2C_CON_STT) { |
| 686 | con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); |
| 687 | |
| 688 | /* Let the user know if i2c is in a bad state */ |
| 689 | if (time_after(jiffies, delay)) { |
| 690 | dev_err(dev->dev, "controller timed out " |
| 691 | "waiting for start condition to finish\n"); |
| 692 | return -ETIMEDOUT; |
| 693 | } |
| 694 | cpu_relax(); |
| 695 | } |
| 696 | |
| 697 | w |= OMAP_I2C_CON_STP; |
| 698 | w &= ~OMAP_I2C_CON_STT; |
| 699 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); |
| 700 | } |
| 701 | |
| 702 | /* |
Jarkko Nikula | b7af349 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 703 | * REVISIT: We should abort the transfer on signals, but the bus goes |
| 704 | * into arbitration and we're currently unable to recover from it. |
| 705 | */ |
Shubhrajyoti D | 33d5498 | 2012-05-29 16:26:17 +0530 | [diff] [blame] | 706 | timeout = wait_for_completion_timeout(&dev->cmd_complete, |
| 707 | OMAP_I2C_TIMEOUT); |
Shubhrajyoti D | 33d5498 | 2012-05-29 16:26:17 +0530 | [diff] [blame] | 708 | if (timeout == 0) { |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 709 | dev_err(dev->dev, "controller timed out\n"); |
Shubhrajyoti D | d6c842a | 2012-11-05 17:53:41 +0530 | [diff] [blame] | 710 | omap_i2c_reset(dev); |
| 711 | __omap_i2c_init(dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 712 | return -ETIMEDOUT; |
| 713 | } |
| 714 | |
| 715 | if (likely(!dev->cmd_err)) |
| 716 | return 0; |
| 717 | |
| 718 | /* We have an error */ |
Alexander Kochetkov | b76911d | 2014-11-22 23:47:13 +0400 | [diff] [blame] | 719 | if (dev->cmd_err & (OMAP_I2C_STAT_ROVR | OMAP_I2C_STAT_XUDF)) { |
Shubhrajyoti D | d6c842a | 2012-11-05 17:53:41 +0530 | [diff] [blame] | 720 | omap_i2c_reset(dev); |
| 721 | __omap_i2c_init(dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 722 | return -EIO; |
| 723 | } |
| 724 | |
Alexander Kochetkov | b76911d | 2014-11-22 23:47:13 +0400 | [diff] [blame] | 725 | if (dev->cmd_err & OMAP_I2C_STAT_AL) |
| 726 | return -EAGAIN; |
| 727 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 728 | if (dev->cmd_err & OMAP_I2C_STAT_NACK) { |
| 729 | if (msg->flags & I2C_M_IGNORE_NAK) |
| 730 | return 0; |
Grygorii Strashko | cda2109 | 2013-06-07 21:46:07 +0300 | [diff] [blame] | 731 | |
| 732 | w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); |
| 733 | w |= OMAP_I2C_CON_STP; |
| 734 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 735 | return -EREMOTEIO; |
| 736 | } |
| 737 | return -EIO; |
| 738 | } |
| 739 | |
| 740 | |
| 741 | /* |
| 742 | * Prepare controller for a transaction and call omap_i2c_xfer_msg |
| 743 | * to do the work during IRQ processing. |
| 744 | */ |
| 745 | static int |
| 746 | omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) |
| 747 | { |
| 748 | struct omap_i2c_dev *dev = i2c_get_adapdata(adap); |
| 749 | int i; |
| 750 | int r; |
| 751 | |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 752 | r = pm_runtime_get_sync(dev->dev); |
Nishanth Menon | ff37025 | 2014-03-27 11:18:33 -0500 | [diff] [blame] | 753 | if (r < 0) |
Kevin Hilman | 33ec5e8 | 2012-06-26 18:45:32 -0700 | [diff] [blame] | 754 | goto out; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 755 | |
Alexander Kochetkov | 0f5768b | 2014-11-22 23:47:12 +0400 | [diff] [blame] | 756 | r = omap_i2c_wait_for_bb_valid(dev); |
| 757 | if (r < 0) |
| 758 | goto out; |
| 759 | |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 760 | r = omap_i2c_wait_for_bb(dev); |
| 761 | if (r < 0) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 762 | goto out; |
| 763 | |
Paul Walmsley | 49839dc | 2012-11-06 16:31:32 +0000 | [diff] [blame] | 764 | if (dev->set_mpu_wkup_lat != NULL) |
| 765 | dev->set_mpu_wkup_lat(dev->dev, dev->latency); |
Samu Onkalo | 6a91b55 | 2010-11-18 12:04:20 +0200 | [diff] [blame] | 766 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 767 | for (i = 0; i < num; i++) { |
| 768 | r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1))); |
| 769 | if (r != 0) |
| 770 | break; |
| 771 | } |
| 772 | |
| 773 | if (r == 0) |
| 774 | r = num; |
Mathias Nyman | 5c64eb2 | 2010-08-26 07:36:44 +0000 | [diff] [blame] | 775 | |
| 776 | omap_i2c_wait_for_bb(dev); |
Shubhrajyoti D | 1ab3604 | 2012-11-15 14:19:21 +0530 | [diff] [blame] | 777 | |
| 778 | if (dev->set_mpu_wkup_lat != NULL) |
| 779 | dev->set_mpu_wkup_lat(dev->dev, -1); |
| 780 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 781 | out: |
Felipe Balbi | 6d8451d | 2012-09-12 16:28:15 +0530 | [diff] [blame] | 782 | pm_runtime_mark_last_busy(dev->dev); |
| 783 | pm_runtime_put_autosuspend(dev->dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 784 | return r; |
| 785 | } |
| 786 | |
| 787 | static u32 |
| 788 | omap_i2c_func(struct i2c_adapter *adap) |
| 789 | { |
Laurent Pinchart | fb604a3 | 2012-07-24 14:13:59 +0200 | [diff] [blame] | 790 | return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | |
| 791 | I2C_FUNC_PROTOCOL_MANGLING; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | static inline void |
| 795 | omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err) |
| 796 | { |
| 797 | dev->cmd_err |= err; |
| 798 | complete(&dev->cmd_complete); |
| 799 | } |
| 800 | |
| 801 | static inline void |
| 802 | omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat) |
| 803 | { |
| 804 | omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat); |
| 805 | } |
| 806 | |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 807 | static inline void i2c_omap_errata_i207(struct omap_i2c_dev *dev, u16 stat) |
| 808 | { |
| 809 | /* |
| 810 | * I2C Errata(Errata Nos. OMAP2: 1.67, OMAP3: 1.8) |
| 811 | * Not applicable for OMAP4. |
| 812 | * Under certain rare conditions, RDR could be set again |
| 813 | * when the bus is busy, then ignore the interrupt and |
| 814 | * clear the interrupt. |
| 815 | */ |
| 816 | if (stat & OMAP_I2C_STAT_RDR) { |
| 817 | /* Step 1: If RDR is set, clear it */ |
| 818 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); |
| 819 | |
| 820 | /* Step 2: */ |
| 821 | if (!(omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) |
| 822 | & OMAP_I2C_STAT_BB)) { |
| 823 | |
| 824 | /* Step 3: */ |
| 825 | if (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) |
| 826 | & OMAP_I2C_STAT_RDR) { |
| 827 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); |
| 828 | dev_dbg(dev->dev, "RDR when bus is busy.\n"); |
| 829 | } |
| 830 | |
| 831 | } |
| 832 | } |
| 833 | } |
| 834 | |
Paul Walmsley | 43469d8e | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 835 | /* rev1 devices are apparently only on some 15xx */ |
| 836 | #ifdef CONFIG_ARCH_OMAP15XX |
| 837 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 838 | static irqreturn_t |
Andy Green | 4e80f72 | 2011-05-30 07:43:07 -0700 | [diff] [blame] | 839 | omap_i2c_omap1_isr(int this_irq, void *dev_id) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 840 | { |
| 841 | struct omap_i2c_dev *dev = dev_id; |
| 842 | u16 iv, w; |
| 843 | |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 844 | if (pm_runtime_suspended(dev->dev)) |
Tony Lindgren | f08ac4e | 2008-03-23 20:28:20 +0100 | [diff] [blame] | 845 | return IRQ_NONE; |
| 846 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 847 | iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); |
| 848 | switch (iv) { |
| 849 | case 0x00: /* None */ |
| 850 | break; |
| 851 | case 0x01: /* Arbitration lost */ |
| 852 | dev_err(dev->dev, "Arbitration lost\n"); |
| 853 | omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL); |
| 854 | break; |
| 855 | case 0x02: /* No acknowledgement */ |
| 856 | omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK); |
| 857 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP); |
| 858 | break; |
| 859 | case 0x03: /* Register access ready */ |
| 860 | omap_i2c_complete_cmd(dev, 0); |
| 861 | break; |
| 862 | case 0x04: /* Receive data ready */ |
| 863 | if (dev->buf_len) { |
| 864 | w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); |
| 865 | *dev->buf++ = w; |
| 866 | dev->buf_len--; |
| 867 | if (dev->buf_len) { |
| 868 | *dev->buf++ = w >> 8; |
| 869 | dev->buf_len--; |
| 870 | } |
| 871 | } else |
| 872 | dev_err(dev->dev, "RRDY IRQ while no data requested\n"); |
| 873 | break; |
| 874 | case 0x05: /* Transmit data ready */ |
| 875 | if (dev->buf_len) { |
| 876 | w = *dev->buf++; |
| 877 | dev->buf_len--; |
| 878 | if (dev->buf_len) { |
| 879 | w |= *dev->buf++ << 8; |
| 880 | dev->buf_len--; |
| 881 | } |
| 882 | omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); |
| 883 | } else |
| 884 | dev_err(dev->dev, "XRDY IRQ while no data to send\n"); |
| 885 | break; |
| 886 | default: |
| 887 | return IRQ_NONE; |
| 888 | } |
| 889 | |
| 890 | return IRQ_HANDLED; |
| 891 | } |
Paul Walmsley | 43469d8e | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 892 | #else |
Andy Green | 4e80f72 | 2011-05-30 07:43:07 -0700 | [diff] [blame] | 893 | #define omap_i2c_omap1_isr NULL |
Paul Walmsley | 43469d8e | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 894 | #endif |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 895 | |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 896 | /* |
Shubhrajyoti D | c8db38f | 2012-05-29 16:26:22 +0530 | [diff] [blame] | 897 | * OMAP3430 Errata i462: When an XRDY/XDR is hit, wait for XUDF before writing |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 898 | * data to DATA_REG. Otherwise some data bytes can be lost while transferring |
| 899 | * them from the memory to the I2C interface. |
| 900 | */ |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 901 | static int errata_omap3_i462(struct omap_i2c_dev *dev) |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 902 | { |
Alexander Shishkin | e9f59b9 | 2010-05-11 11:35:17 -0700 | [diff] [blame] | 903 | unsigned long timeout = 10000; |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 904 | u16 stat; |
Alexander Shishkin | e9f59b9 | 2010-05-11 11:35:17 -0700 | [diff] [blame] | 905 | |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 906 | do { |
| 907 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); |
| 908 | if (stat & OMAP_I2C_STAT_XUDF) |
| 909 | break; |
| 910 | |
| 911 | if (stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) { |
Felipe Balbi | 540a479 | 2012-09-12 16:27:59 +0530 | [diff] [blame] | 912 | omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_XRDY | |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 913 | OMAP_I2C_STAT_XDR)); |
Felipe Balbi | b07be0f | 2012-09-12 16:28:11 +0530 | [diff] [blame] | 914 | if (stat & OMAP_I2C_STAT_NACK) { |
| 915 | dev->cmd_err |= OMAP_I2C_STAT_NACK; |
| 916 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); |
| 917 | } |
| 918 | |
| 919 | if (stat & OMAP_I2C_STAT_AL) { |
| 920 | dev_err(dev->dev, "Arbitration lost\n"); |
| 921 | dev->cmd_err |= OMAP_I2C_STAT_AL; |
Aaro Koskinen | 2c5de55 | 2013-01-20 02:32:58 +0200 | [diff] [blame] | 922 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_AL); |
Felipe Balbi | b07be0f | 2012-09-12 16:28:11 +0530 | [diff] [blame] | 923 | } |
| 924 | |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 925 | return -EIO; |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 926 | } |
Alexander Shishkin | e9f59b9 | 2010-05-11 11:35:17 -0700 | [diff] [blame] | 927 | |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 928 | cpu_relax(); |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 929 | } while (--timeout); |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 930 | |
Alexander Shishkin | e9f59b9 | 2010-05-11 11:35:17 -0700 | [diff] [blame] | 931 | if (!timeout) { |
| 932 | dev_err(dev->dev, "timeout waiting on XUDF bit\n"); |
| 933 | return 0; |
| 934 | } |
| 935 | |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 936 | return 0; |
| 937 | } |
| 938 | |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 939 | static void omap_i2c_receive_data(struct omap_i2c_dev *dev, u8 num_bytes, |
| 940 | bool is_rdr) |
| 941 | { |
| 942 | u16 w; |
| 943 | |
| 944 | while (num_bytes--) { |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 945 | w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); |
| 946 | *dev->buf++ = w; |
| 947 | dev->buf_len--; |
| 948 | |
| 949 | /* |
| 950 | * Data reg in 2430, omap3 and |
| 951 | * omap4 is 8 bit wide |
| 952 | */ |
| 953 | if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 954 | *dev->buf++ = w >> 8; |
| 955 | dev->buf_len--; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 956 | } |
| 957 | } |
| 958 | } |
| 959 | |
| 960 | static int omap_i2c_transmit_data(struct omap_i2c_dev *dev, u8 num_bytes, |
| 961 | bool is_xdr) |
| 962 | { |
| 963 | u16 w; |
| 964 | |
| 965 | while (num_bytes--) { |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 966 | w = *dev->buf++; |
| 967 | dev->buf_len--; |
| 968 | |
| 969 | /* |
| 970 | * Data reg in 2430, omap3 and |
| 971 | * omap4 is 8 bit wide |
| 972 | */ |
| 973 | if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 974 | w |= *dev->buf++ << 8; |
| 975 | dev->buf_len--; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 976 | } |
| 977 | |
| 978 | if (dev->errata & I2C_OMAP_ERRATA_I462) { |
| 979 | int ret; |
| 980 | |
| 981 | ret = errata_omap3_i462(dev); |
| 982 | if (ret < 0) |
| 983 | return ret; |
| 984 | } |
| 985 | |
| 986 | omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); |
| 987 | } |
| 988 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 989 | return 0; |
| 990 | } |
| 991 | |
| 992 | static irqreturn_t |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame] | 993 | omap_i2c_isr(int irq, void *dev_id) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 994 | { |
| 995 | struct omap_i2c_dev *dev = dev_id; |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame] | 996 | irqreturn_t ret = IRQ_HANDLED; |
| 997 | u16 mask; |
| 998 | u16 stat; |
| 999 | |
| 1000 | spin_lock(&dev->lock); |
| 1001 | mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); |
| 1002 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); |
| 1003 | |
| 1004 | if (stat & mask) |
| 1005 | ret = IRQ_WAKE_THREAD; |
| 1006 | |
| 1007 | spin_unlock(&dev->lock); |
| 1008 | |
| 1009 | return ret; |
| 1010 | } |
| 1011 | |
| 1012 | static irqreturn_t |
| 1013 | omap_i2c_isr_thread(int this_irq, void *dev_id) |
| 1014 | { |
| 1015 | struct omap_i2c_dev *dev = dev_id; |
| 1016 | unsigned long flags; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1017 | u16 bits; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 1018 | u16 stat; |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 1019 | int err = 0, count = 0; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1020 | |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame] | 1021 | spin_lock_irqsave(&dev->lock, flags); |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 1022 | do { |
| 1023 | bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); |
| 1024 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); |
| 1025 | stat &= bits; |
Tony Lindgren | f08ac4e | 2008-03-23 20:28:20 +0100 | [diff] [blame] | 1026 | |
Felipe Balbi | 079d8af | 2012-09-12 16:28:06 +0530 | [diff] [blame] | 1027 | /* If we're in receiver mode, ignore XDR/XRDY */ |
| 1028 | if (dev->receiver) |
| 1029 | stat &= ~(OMAP_I2C_STAT_XDR | OMAP_I2C_STAT_XRDY); |
| 1030 | else |
| 1031 | stat &= ~(OMAP_I2C_STAT_RDR | OMAP_I2C_STAT_RRDY); |
| 1032 | |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 1033 | if (!stat) { |
| 1034 | /* my work here is done */ |
Felipe Balbi | 0bdfe0c | 2012-09-12 16:28:16 +0530 | [diff] [blame] | 1035 | goto out; |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 1036 | } |
| 1037 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1038 | dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat); |
| 1039 | if (count++ == 100) { |
| 1040 | dev_warn(dev->dev, "Too much work in one IRQ\n"); |
| 1041 | break; |
| 1042 | } |
| 1043 | |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 1044 | if (stat & OMAP_I2C_STAT_NACK) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1045 | err |= OMAP_I2C_STAT_NACK; |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 1046 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 1047 | } |
Jan Weitzel | 78e1cf4 | 2011-12-07 11:50:16 -0800 | [diff] [blame] | 1048 | |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1049 | if (stat & OMAP_I2C_STAT_AL) { |
| 1050 | dev_err(dev->dev, "Arbitration lost\n"); |
| 1051 | err |= OMAP_I2C_STAT_AL; |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 1052 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_AL); |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1053 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 1054 | |
Ben Dooks | a5a595c | 2011-02-23 00:43:55 +0000 | [diff] [blame] | 1055 | /* |
Richard woodruff | cb527ed | 2011-02-16 10:24:16 +0530 | [diff] [blame] | 1056 | * ProDB0017052: Clear ARDY bit twice |
Ben Dooks | a5a595c | 2011-02-23 00:43:55 +0000 | [diff] [blame] | 1057 | */ |
Taras Kondratiuk | 4cdbf7d | 2013-10-07 13:41:59 +0300 | [diff] [blame] | 1058 | if (stat & OMAP_I2C_STAT_ARDY) |
| 1059 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ARDY); |
| 1060 | |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1061 | if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK | |
Sonasath, Moiz | 04c688d | 2009-07-21 10:14:40 -0500 | [diff] [blame] | 1062 | OMAP_I2C_STAT_AL)) { |
Felipe Balbi | 540a479 | 2012-09-12 16:27:59 +0530 | [diff] [blame] | 1063 | omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_RRDY | |
| 1064 | OMAP_I2C_STAT_RDR | |
| 1065 | OMAP_I2C_STAT_XRDY | |
| 1066 | OMAP_I2C_STAT_XDR | |
| 1067 | OMAP_I2C_STAT_ARDY)); |
Felipe Balbi | 0bdfe0c | 2012-09-12 16:28:16 +0530 | [diff] [blame] | 1068 | break; |
Sonasath, Moiz | 04c688d | 2009-07-21 10:14:40 -0500 | [diff] [blame] | 1069 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 1070 | |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1071 | if (stat & OMAP_I2C_STAT_RDR) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1072 | u8 num_bytes = 1; |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 1073 | |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1074 | if (dev->fifo_size) |
| 1075 | num_bytes = dev->buf_len; |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 1076 | |
Alexander Kochetkov | ccfc866 | 2014-11-21 04:16:51 +0400 | [diff] [blame] | 1077 | if (dev->errata & I2C_OMAP_ERRATA_I207) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1078 | i2c_omap_errata_i207(dev, stat); |
Alexander Kochetkov | ccfc866 | 2014-11-21 04:16:51 +0400 | [diff] [blame] | 1079 | num_bytes = (omap_i2c_read_reg(dev, |
| 1080 | OMAP_I2C_BUFSTAT_REG) >> 8) & 0x3F; |
| 1081 | } |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1082 | |
Alexander Kochetkov | ccfc866 | 2014-11-21 04:16:51 +0400 | [diff] [blame] | 1083 | omap_i2c_receive_data(dev, num_bytes, true); |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1084 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); |
Aaro Koskinen | 9eb13cf | 2013-01-20 20:37:02 +0200 | [diff] [blame] | 1085 | continue; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1086 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 1087 | |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1088 | if (stat & OMAP_I2C_STAT_RRDY) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1089 | u8 num_bytes = 1; |
Sonasath, Moiz | cd086d3 | 2009-07-21 10:15:12 -0500 | [diff] [blame] | 1090 | |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 1091 | if (dev->threshold) |
| 1092 | num_bytes = dev->threshold; |
Sonasath, Moiz | cd086d3 | 2009-07-21 10:15:12 -0500 | [diff] [blame] | 1093 | |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 1094 | omap_i2c_receive_data(dev, num_bytes, false); |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1095 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1096 | continue; |
| 1097 | } |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1098 | |
| 1099 | if (stat & OMAP_I2C_STAT_XDR) { |
| 1100 | u8 num_bytes = 1; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 1101 | int ret; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1102 | |
| 1103 | if (dev->fifo_size) |
| 1104 | num_bytes = dev->buf_len; |
| 1105 | |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 1106 | ret = omap_i2c_transmit_data(dev, num_bytes, true); |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 1107 | if (ret < 0) |
Felipe Balbi | 0bdfe0c | 2012-09-12 16:28:16 +0530 | [diff] [blame] | 1108 | break; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1109 | |
| 1110 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XDR); |
Aaro Koskinen | 9eb13cf | 2013-01-20 20:37:02 +0200 | [diff] [blame] | 1111 | continue; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1112 | } |
| 1113 | |
| 1114 | if (stat & OMAP_I2C_STAT_XRDY) { |
| 1115 | u8 num_bytes = 1; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 1116 | int ret; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1117 | |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 1118 | if (dev->threshold) |
| 1119 | num_bytes = dev->threshold; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1120 | |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 1121 | ret = omap_i2c_transmit_data(dev, num_bytes, false); |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 1122 | if (ret < 0) |
Felipe Balbi | 0bdfe0c | 2012-09-12 16:28:16 +0530 | [diff] [blame] | 1123 | break; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 1124 | |
| 1125 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1126 | continue; |
| 1127 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 1128 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1129 | if (stat & OMAP_I2C_STAT_ROVR) { |
| 1130 | dev_err(dev->dev, "Receive overrun\n"); |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 1131 | err |= OMAP_I2C_STAT_ROVR; |
| 1132 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ROVR); |
Felipe Balbi | 0bdfe0c | 2012-09-12 16:28:16 +0530 | [diff] [blame] | 1133 | break; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1134 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 1135 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1136 | if (stat & OMAP_I2C_STAT_XUDF) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1137 | dev_err(dev->dev, "Transmit underflow\n"); |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 1138 | err |= OMAP_I2C_STAT_XUDF; |
| 1139 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XUDF); |
Felipe Balbi | 0bdfe0c | 2012-09-12 16:28:16 +0530 | [diff] [blame] | 1140 | break; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1141 | } |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 1142 | } while (stat); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1143 | |
Felipe Balbi | 4a7ec4e | 2012-09-12 16:28:09 +0530 | [diff] [blame] | 1144 | omap_i2c_complete_cmd(dev, err); |
Felipe Balbi | 0bdfe0c | 2012-09-12 16:28:16 +0530 | [diff] [blame] | 1145 | |
| 1146 | out: |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame] | 1147 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1148 | |
Felipe Balbi | 6a85ced | 2012-09-12 16:28:08 +0530 | [diff] [blame] | 1149 | return IRQ_HANDLED; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1150 | } |
| 1151 | |
Jean Delvare | 8f9082c | 2006-09-03 22:39:46 +0200 | [diff] [blame] | 1152 | static const struct i2c_algorithm omap_i2c_algo = { |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1153 | .master_xfer = omap_i2c_xfer, |
| 1154 | .functionality = omap_i2c_func, |
| 1155 | }; |
| 1156 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1157 | #ifdef CONFIG_OF |
Tony Lindgren | 4c62484 | 2013-11-14 15:25:07 -0800 | [diff] [blame] | 1158 | static struct omap_i2c_bus_platform_data omap2420_pdata = { |
| 1159 | .rev = OMAP_I2C_IP_VERSION_1, |
| 1160 | .flags = OMAP_I2C_FLAG_NO_FIFO | |
| 1161 | OMAP_I2C_FLAG_SIMPLE_CLOCK | |
| 1162 | OMAP_I2C_FLAG_16BIT_DATA_REG | |
| 1163 | OMAP_I2C_FLAG_BUS_SHIFT_2, |
| 1164 | }; |
| 1165 | |
| 1166 | static struct omap_i2c_bus_platform_data omap2430_pdata = { |
| 1167 | .rev = OMAP_I2C_IP_VERSION_1, |
| 1168 | .flags = OMAP_I2C_FLAG_BUS_SHIFT_2 | |
| 1169 | OMAP_I2C_FLAG_FORCE_19200_INT_CLK, |
| 1170 | }; |
| 1171 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1172 | static struct omap_i2c_bus_platform_data omap3_pdata = { |
| 1173 | .rev = OMAP_I2C_IP_VERSION_1, |
Shubhrajyoti D | 972deb4 | 2012-11-26 15:25:11 +0530 | [diff] [blame] | 1174 | .flags = OMAP_I2C_FLAG_BUS_SHIFT_2, |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1175 | }; |
| 1176 | |
| 1177 | static struct omap_i2c_bus_platform_data omap4_pdata = { |
| 1178 | .rev = OMAP_I2C_IP_VERSION_2, |
| 1179 | }; |
| 1180 | |
| 1181 | static const struct of_device_id omap_i2c_of_match[] = { |
| 1182 | { |
| 1183 | .compatible = "ti,omap4-i2c", |
| 1184 | .data = &omap4_pdata, |
| 1185 | }, |
| 1186 | { |
| 1187 | .compatible = "ti,omap3-i2c", |
| 1188 | .data = &omap3_pdata, |
| 1189 | }, |
Tony Lindgren | 4c62484 | 2013-11-14 15:25:07 -0800 | [diff] [blame] | 1190 | { |
| 1191 | .compatible = "ti,omap2430-i2c", |
| 1192 | .data = &omap2430_pdata, |
| 1193 | }, |
| 1194 | { |
| 1195 | .compatible = "ti,omap2420-i2c", |
| 1196 | .data = &omap2420_pdata, |
| 1197 | }, |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1198 | { }, |
| 1199 | }; |
| 1200 | MODULE_DEVICE_TABLE(of, omap_i2c_of_match); |
| 1201 | #endif |
| 1202 | |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 1203 | #define OMAP_I2C_SCHEME(rev) ((rev & 0xc000) >> 14) |
| 1204 | |
| 1205 | #define OMAP_I2C_REV_SCHEME_0_MAJOR(rev) (rev >> 4) |
| 1206 | #define OMAP_I2C_REV_SCHEME_0_MINOR(rev) (rev & 0xf) |
| 1207 | |
| 1208 | #define OMAP_I2C_REV_SCHEME_1_MAJOR(rev) ((rev & 0x0700) >> 7) |
| 1209 | #define OMAP_I2C_REV_SCHEME_1_MINOR(rev) (rev & 0x1f) |
| 1210 | #define OMAP_I2C_SCHEME_0 0 |
| 1211 | #define OMAP_I2C_SCHEME_1 1 |
| 1212 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 1213 | static int |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1214 | omap_i2c_probe(struct platform_device *pdev) |
| 1215 | { |
| 1216 | struct omap_i2c_dev *dev; |
| 1217 | struct i2c_adapter *adap; |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1218 | struct resource *mem; |
Uwe Kleine-König | c4dba01 | 2012-05-21 21:57:39 +0200 | [diff] [blame] | 1219 | const struct omap_i2c_bus_platform_data *pdata = |
Jingoo Han | 6d4028c | 2013-07-30 16:59:33 +0900 | [diff] [blame] | 1220 | dev_get_platdata(&pdev->dev); |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1221 | struct device_node *node = pdev->dev.of_node; |
| 1222 | const struct of_device_id *match; |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1223 | int irq; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1224 | int r; |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 1225 | u32 rev; |
Oleksandr Dmytryshyn | 4368de1 | 2013-06-03 10:37:20 +0300 | [diff] [blame] | 1226 | u16 minor, major; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1227 | |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1228 | irq = platform_get_irq(pdev, 0); |
| 1229 | if (irq < 0) { |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1230 | dev_err(&pdev->dev, "no irq resource?\n"); |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1231 | return irq; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1232 | } |
| 1233 | |
Felipe Balbi | d9ebd04 | 2012-09-12 16:27:55 +0530 | [diff] [blame] | 1234 | dev = devm_kzalloc(&pdev->dev, sizeof(struct omap_i2c_dev), GFP_KERNEL); |
Jingoo Han | 46797a2 | 2014-05-13 10:51:58 +0900 | [diff] [blame] | 1235 | if (!dev) |
Felipe Balbi | d9ebd04 | 2012-09-12 16:27:55 +0530 | [diff] [blame] | 1236 | return -ENOMEM; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1237 | |
Wolfram Sang | 3cc2d00 | 2013-05-10 10:16:54 +0200 | [diff] [blame] | 1238 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Thierry Reding | 84dbf80 | 2013-01-21 11:09:03 +0100 | [diff] [blame] | 1239 | dev->base = devm_ioremap_resource(&pdev->dev, mem); |
| 1240 | if (IS_ERR(dev->base)) |
| 1241 | return PTR_ERR(dev->base); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1242 | |
Cousson, Benoit | 6c5aa40 | 2012-01-20 16:55:04 +0100 | [diff] [blame] | 1243 | match = of_match_device(of_match_ptr(omap_i2c_of_match), &pdev->dev); |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1244 | if (match) { |
| 1245 | u32 freq = 100000; /* default to 100000 Hz */ |
| 1246 | |
| 1247 | pdata = match->data; |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1248 | dev->flags = pdata->flags; |
| 1249 | |
| 1250 | of_property_read_u32(node, "clock-frequency", &freq); |
| 1251 | /* convert DT freq value in Hz into kHz for speed */ |
| 1252 | dev->speed = freq / 1000; |
| 1253 | } else if (pdata != NULL) { |
| 1254 | dev->speed = pdata->clkrate; |
| 1255 | dev->flags = pdata->flags; |
Paul Walmsley | 49839dc | 2012-11-06 16:31:32 +0000 | [diff] [blame] | 1256 | dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat; |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 1257 | } |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 1258 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1259 | dev->dev = &pdev->dev; |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1260 | dev->irq = irq; |
Russell King | 55c381e | 2008-09-04 14:07:22 +0100 | [diff] [blame] | 1261 | |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame] | 1262 | spin_lock_init(&dev->lock); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1263 | |
| 1264 | platform_set_drvdata(pdev, dev); |
Shubhrajyoti D | 0e33bbb | 2012-06-28 20:41:29 +0530 | [diff] [blame] | 1265 | init_completion(&dev->cmd_complete); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1266 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1267 | dev->reg_shift = (dev->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3; |
Mika Westerberg | 7c6bd20 | 2010-03-23 12:12:56 +0200 | [diff] [blame] | 1268 | |
Kevin Hilman | 7f4b08e | 2011-05-17 16:31:37 +0200 | [diff] [blame] | 1269 | pm_runtime_enable(dev->dev); |
Felipe Balbi | 6d8451d | 2012-09-12 16:28:15 +0530 | [diff] [blame] | 1270 | pm_runtime_set_autosuspend_delay(dev->dev, OMAP_I2C_PM_TIMEOUT); |
| 1271 | pm_runtime_use_autosuspend(dev->dev); |
| 1272 | |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 1273 | r = pm_runtime_get_sync(dev->dev); |
Nishanth Menon | ff37025 | 2014-03-27 11:18:33 -0500 | [diff] [blame] | 1274 | if (r < 0) |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 1275 | goto err_free_mem; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1276 | |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 1277 | /* |
| 1278 | * Read the Rev hi bit-[15:14] ie scheme this is 1 indicates ver2. |
| 1279 | * On omap1/3/2 Offset 4 is IE Reg the bit [15:14] is 0 at reset. |
| 1280 | * Also since the omap_i2c_read_reg uses reg_map_ip_* a |
Victor Kamensky | 40b13ca | 2013-11-27 15:48:08 +0200 | [diff] [blame] | 1281 | * readw_relaxed is done. |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 1282 | */ |
Victor Kamensky | 40b13ca | 2013-11-27 15:48:08 +0200 | [diff] [blame] | 1283 | rev = readw_relaxed(dev->base + 0x04); |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 1284 | |
Oleksandr Dmytryshyn | 4368de1 | 2013-06-03 10:37:20 +0300 | [diff] [blame] | 1285 | dev->scheme = OMAP_I2C_SCHEME(rev); |
| 1286 | switch (dev->scheme) { |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 1287 | case OMAP_I2C_SCHEME_0: |
| 1288 | dev->regs = (u8 *)reg_map_ip_v1; |
| 1289 | dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG); |
| 1290 | minor = OMAP_I2C_REV_SCHEME_0_MAJOR(dev->rev); |
| 1291 | major = OMAP_I2C_REV_SCHEME_0_MAJOR(dev->rev); |
| 1292 | break; |
| 1293 | case OMAP_I2C_SCHEME_1: |
| 1294 | /* FALLTHROUGH */ |
| 1295 | default: |
| 1296 | dev->regs = (u8 *)reg_map_ip_v2; |
| 1297 | rev = (rev << 16) | |
| 1298 | omap_i2c_read_reg(dev, OMAP_I2C_IP_V2_REVNB_LO); |
| 1299 | minor = OMAP_I2C_REV_SCHEME_1_MINOR(rev); |
| 1300 | major = OMAP_I2C_REV_SCHEME_1_MAJOR(rev); |
| 1301 | dev->rev = rev; |
| 1302 | } |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1303 | |
Tasslehoff Kjappfot | 9aa8ec6 | 2012-05-29 16:26:20 +0530 | [diff] [blame] | 1304 | dev->errata = 0; |
| 1305 | |
Shubhrajyoti D | a748021 | 2012-11-05 17:53:37 +0530 | [diff] [blame] | 1306 | if (dev->rev >= OMAP_I2C_REV_ON_2430 && |
| 1307 | dev->rev < OMAP_I2C_REV_ON_4430_PLUS) |
Tasslehoff Kjappfot | 9aa8ec6 | 2012-05-29 16:26:20 +0530 | [diff] [blame] | 1308 | dev->errata |= I2C_OMAP_ERRATA_I207; |
| 1309 | |
Jon Hunter | f518b48 | 2012-06-28 20:41:31 +0530 | [diff] [blame] | 1310 | if (dev->rev <= OMAP_I2C_REV_ON_3430_3530) |
Shubhrajyoti D | c8db38f | 2012-05-29 16:26:22 +0530 | [diff] [blame] | 1311 | dev->errata |= I2C_OMAP_ERRATA_I462; |
manjugk manjugk | 8a9d97d | 2010-05-11 11:35:23 -0700 | [diff] [blame] | 1312 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1313 | if (!(dev->flags & OMAP_I2C_FLAG_NO_FIFO)) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1314 | u16 s; |
| 1315 | |
| 1316 | /* Set up the fifo size - Get total size */ |
| 1317 | s = (omap_i2c_read_reg(dev, OMAP_I2C_BUFSTAT_REG) >> 14) & 0x3; |
| 1318 | dev->fifo_size = 0x8 << s; |
| 1319 | |
| 1320 | /* |
| 1321 | * Set up notification threshold as half the total available |
| 1322 | * size. This is to ensure that we can handle the status on int |
| 1323 | * call back latencies. |
| 1324 | */ |
Shubhrajyoti D | 1d5a34f | 2011-12-06 10:25:58 -0800 | [diff] [blame] | 1325 | |
| 1326 | dev->fifo_size = (dev->fifo_size / 2); |
| 1327 | |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 1328 | if (dev->rev < OMAP_I2C_REV_ON_3630) |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 1329 | dev->b_hw = 1; /* Enable hardware fixes */ |
Shubhrajyoti D | 1d5a34f | 2011-12-06 10:25:58 -0800 | [diff] [blame] | 1330 | |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 1331 | /* calculate wakeup latency constraint for MPU */ |
Paul Walmsley | 49839dc | 2012-11-06 16:31:32 +0000 | [diff] [blame] | 1332 | if (dev->set_mpu_wkup_lat != NULL) |
| 1333 | dev->latency = (1000000 * dev->fifo_size) / |
| 1334 | (1000 * dev->speed / 8); |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1335 | } |
| 1336 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1337 | /* reset ASAP, clearing any IRQs */ |
| 1338 | omap_i2c_init(dev); |
| 1339 | |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame] | 1340 | if (dev->rev < OMAP_I2C_OMAP1_REV_2) |
| 1341 | r = devm_request_irq(&pdev->dev, dev->irq, omap_i2c_omap1_isr, |
| 1342 | IRQF_NO_SUSPEND, pdev->name, dev); |
| 1343 | else |
| 1344 | r = devm_request_threaded_irq(&pdev->dev, dev->irq, |
| 1345 | omap_i2c_isr, omap_i2c_isr_thread, |
| 1346 | IRQF_NO_SUSPEND | IRQF_ONESHOT, |
| 1347 | pdev->name, dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1348 | |
| 1349 | if (r) { |
| 1350 | dev_err(dev->dev, "failure requesting irq %i\n", dev->irq); |
| 1351 | goto err_unuse_clocks; |
| 1352 | } |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 1353 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1354 | adap = &dev->adapter; |
| 1355 | i2c_set_adapdata(adap, dev); |
| 1356 | adap->owner = THIS_MODULE; |
Wolfram Sang | cfac71d | 2014-07-10 13:46:30 +0200 | [diff] [blame] | 1357 | adap->class = I2C_CLASS_DEPRECATED; |
Roel Kluin | 783fd6f | 2009-07-17 15:24:00 +0200 | [diff] [blame] | 1358 | strlcpy(adap->name, "OMAP I2C adapter", sizeof(adap->name)); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1359 | adap->algo = &omap_i2c_algo; |
| 1360 | adap->dev.parent = &pdev->dev; |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1361 | adap->dev.of_node = pdev->dev.of_node; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1362 | |
| 1363 | /* i2c device drivers may be active on return from add_adapter() */ |
David Brownell | 7c17549 | 2007-05-01 23:26:32 +0200 | [diff] [blame] | 1364 | adap->nr = pdev->id; |
| 1365 | r = i2c_add_numbered_adapter(adap); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1366 | if (r) { |
| 1367 | dev_err(dev->dev, "failure adding adapter\n"); |
Felipe Balbi | d9ebd04 | 2012-09-12 16:27:55 +0530 | [diff] [blame] | 1368 | goto err_unuse_clocks; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1369 | } |
| 1370 | |
Shubhrajyoti D | cd10c74 | 2012-11-05 17:53:38 +0530 | [diff] [blame] | 1371 | dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n", adap->nr, |
| 1372 | major, minor, dev->speed); |
Florian Vaussard | c5d3cd6 | 2012-08-31 13:02:55 +0200 | [diff] [blame] | 1373 | |
Felipe Balbi | 6d8451d | 2012-09-12 16:28:15 +0530 | [diff] [blame] | 1374 | pm_runtime_mark_last_busy(dev->dev); |
| 1375 | pm_runtime_put_autosuspend(dev->dev); |
Shubhrajyoti D | 62ff2c2 | 2012-05-29 16:26:16 +0530 | [diff] [blame] | 1376 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1377 | return 0; |
| 1378 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1379 | err_unuse_clocks: |
Tony Lindgren | 3e39752 | 2008-01-14 21:53:30 +0100 | [diff] [blame] | 1380 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1381 | pm_runtime_put(dev->dev); |
Shubhrajyoti D | 2474051 | 2012-05-29 16:26:14 +0530 | [diff] [blame] | 1382 | pm_runtime_disable(&pdev->dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1383 | err_free_mem: |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1384 | |
| 1385 | return r; |
| 1386 | } |
| 1387 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 1388 | static int omap_i2c_remove(struct platform_device *pdev) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1389 | { |
| 1390 | struct omap_i2c_dev *dev = platform_get_drvdata(pdev); |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 1391 | int ret; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1392 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1393 | i2c_del_adapter(&dev->adapter); |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 1394 | ret = pm_runtime_get_sync(&pdev->dev); |
Nishanth Menon | ff37025 | 2014-03-27 11:18:33 -0500 | [diff] [blame] | 1395 | if (ret < 0) |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 1396 | return ret; |
| 1397 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1398 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
Shubhrajyoti D | 0861f43 | 2012-05-29 16:26:18 +0530 | [diff] [blame] | 1399 | pm_runtime_put(&pdev->dev); |
Shubhrajyoti D | 2474051 | 2012-05-29 16:26:14 +0530 | [diff] [blame] | 1400 | pm_runtime_disable(&pdev->dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1401 | return 0; |
| 1402 | } |
| 1403 | |
Shubhrajyoti D | 5692d2a | 2012-06-28 20:41:28 +0530 | [diff] [blame] | 1404 | #ifdef CONFIG_PM |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1405 | static int omap_i2c_runtime_suspend(struct device *dev) |
| 1406 | { |
| 1407 | struct platform_device *pdev = to_platform_device(dev); |
| 1408 | struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); |
| 1409 | |
Shubhrajyoti D | 3dae3ef | 2012-05-29 16:26:13 +0530 | [diff] [blame] | 1410 | _dev->iestate = omap_i2c_read_reg(_dev, OMAP_I2C_IE_REG); |
Shubhrajyoti D | bd16c82 | 2012-05-29 16:26:15 +0530 | [diff] [blame] | 1411 | |
Oleksandr Dmytryshyn | 4368de1 | 2013-06-03 10:37:20 +0300 | [diff] [blame] | 1412 | if (_dev->scheme == OMAP_I2C_SCHEME_0) |
| 1413 | omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, 0); |
| 1414 | else |
| 1415 | omap_i2c_write_reg(_dev, OMAP_I2C_IP_V2_IRQENABLE_CLR, |
| 1416 | OMAP_I2C_IP_V2_INTERRUPTS_MASK); |
Shubhrajyoti D | 3dae3ef | 2012-05-29 16:26:13 +0530 | [diff] [blame] | 1417 | |
| 1418 | if (_dev->rev < OMAP_I2C_OMAP1_REV_2) { |
Wolfram Sang | 27e0fbe | 2012-11-14 18:12:29 +0100 | [diff] [blame] | 1419 | omap_i2c_read_reg(_dev, OMAP_I2C_IV_REG); /* Read clears */ |
Shubhrajyoti D | 3dae3ef | 2012-05-29 16:26:13 +0530 | [diff] [blame] | 1420 | } else { |
| 1421 | omap_i2c_write_reg(_dev, OMAP_I2C_STAT_REG, _dev->iestate); |
| 1422 | |
| 1423 | /* Flush posted write */ |
| 1424 | omap_i2c_read_reg(_dev, OMAP_I2C_STAT_REG); |
| 1425 | } |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1426 | |
Pascal Huerst | 096ea30 | 2015-05-06 15:07:04 +0200 | [diff] [blame^] | 1427 | pinctrl_pm_select_sleep_state(dev); |
| 1428 | |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1429 | return 0; |
| 1430 | } |
| 1431 | |
| 1432 | static int omap_i2c_runtime_resume(struct device *dev) |
| 1433 | { |
| 1434 | struct platform_device *pdev = to_platform_device(dev); |
| 1435 | struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); |
| 1436 | |
Pascal Huerst | 096ea30 | 2015-05-06 15:07:04 +0200 | [diff] [blame^] | 1437 | pinctrl_pm_select_default_state(dev); |
| 1438 | |
Shubhrajyoti D | 47dcd01 | 2012-11-05 17:53:36 +0530 | [diff] [blame] | 1439 | if (!_dev->regs) |
| 1440 | return 0; |
| 1441 | |
Shubhrajyoti D | 554c967 | 2012-11-05 17:53:42 +0530 | [diff] [blame] | 1442 | __omap_i2c_init(_dev); |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1443 | |
| 1444 | return 0; |
| 1445 | } |
| 1446 | |
| 1447 | static struct dev_pm_ops omap_i2c_pm_ops = { |
Shubhrajyoti D | 5692d2a | 2012-06-28 20:41:28 +0530 | [diff] [blame] | 1448 | SET_RUNTIME_PM_OPS(omap_i2c_runtime_suspend, |
| 1449 | omap_i2c_runtime_resume, NULL) |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1450 | }; |
| 1451 | #define OMAP_I2C_PM_OPS (&omap_i2c_pm_ops) |
| 1452 | #else |
| 1453 | #define OMAP_I2C_PM_OPS NULL |
Shubhrajyoti D | 5692d2a | 2012-06-28 20:41:28 +0530 | [diff] [blame] | 1454 | #endif /* CONFIG_PM */ |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1455 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1456 | static struct platform_driver omap_i2c_driver = { |
| 1457 | .probe = omap_i2c_probe, |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 1458 | .remove = omap_i2c_remove, |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1459 | .driver = { |
Benoit Cousson | f7bb0d9 | 2010-12-09 14:24:16 +0000 | [diff] [blame] | 1460 | .name = "omap_i2c", |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1461 | .pm = OMAP_I2C_PM_OPS, |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1462 | .of_match_table = of_match_ptr(omap_i2c_of_match), |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1463 | }, |
| 1464 | }; |
| 1465 | |
| 1466 | /* I2C may be needed to bring up other drivers */ |
| 1467 | static int __init |
| 1468 | omap_i2c_init_driver(void) |
| 1469 | { |
| 1470 | return platform_driver_register(&omap_i2c_driver); |
| 1471 | } |
| 1472 | subsys_initcall(omap_i2c_init_driver); |
| 1473 | |
| 1474 | static void __exit omap_i2c_exit_driver(void) |
| 1475 | { |
| 1476 | platform_driver_unregister(&omap_i2c_driver); |
| 1477 | } |
| 1478 | module_exit(omap_i2c_exit_driver); |
| 1479 | |
| 1480 | MODULE_AUTHOR("MontaVista Software, Inc. (and others)"); |
| 1481 | MODULE_DESCRIPTION("TI OMAP I2C bus adapter"); |
| 1482 | MODULE_LICENSE("GPL"); |
Benoit Cousson | f7bb0d9 | 2010-12-09 14:24:16 +0000 | [diff] [blame] | 1483 | MODULE_ALIAS("platform:omap_i2c"); |