Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2017, The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/clk.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/i2c.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/io.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/of.h> |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 23 | #include <linux/of_platform.h> |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 24 | #include <linux/platform_device.h> |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 25 | #include <linux/pm_runtime.h> |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 26 | #include <linux/dma-mapping.h> |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 27 | #include <linux/qcom-geni-se.h> |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 28 | #include <linux/ipc_logging.h> |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 29 | |
| 30 | #define SE_I2C_TX_TRANS_LEN (0x26C) |
| 31 | #define SE_I2C_RX_TRANS_LEN (0x270) |
| 32 | #define SE_I2C_SCL_COUNTERS (0x278) |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 33 | #define SE_GENI_IOS (0x908) |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 34 | |
| 35 | #define SE_I2C_ERR (M_CMD_OVERRUN_EN | M_ILLEGAL_CMD_EN | M_CMD_FAILURE_EN |\ |
| 36 | M_GP_IRQ_1_EN | M_GP_IRQ_3_EN | M_GP_IRQ_4_EN) |
| 37 | #define SE_I2C_ABORT (1U << 1) |
| 38 | /* M_CMD OP codes for I2C */ |
| 39 | #define I2C_WRITE (0x1) |
| 40 | #define I2C_READ (0x2) |
| 41 | #define I2C_WRITE_READ (0x3) |
| 42 | #define I2C_ADDR_ONLY (0x4) |
| 43 | #define I2C_BUS_CLEAR (0x6) |
| 44 | #define I2C_STOP_ON_BUS (0x7) |
| 45 | /* M_CMD params for I2C */ |
| 46 | #define PRE_CMD_DELAY (BIT(0)) |
| 47 | #define TIMESTAMP_BEFORE (BIT(1)) |
| 48 | #define STOP_STRETCH (BIT(2)) |
| 49 | #define TIMESTAMP_AFTER (BIT(3)) |
| 50 | #define POST_COMMAND_DELAY (BIT(4)) |
| 51 | #define IGNORE_ADD_NACK (BIT(6)) |
| 52 | #define READ_FINISHED_WITH_ACK (BIT(7)) |
| 53 | #define BYPASS_ADDR_PHASE (BIT(8)) |
| 54 | #define SLV_ADDR_MSK (GENMASK(15, 9)) |
| 55 | #define SLV_ADDR_SHFT (9) |
| 56 | |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 57 | #define I2C_CORE2X_VOTE (10000) |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 58 | #define GP_IRQ0 0 |
| 59 | #define GP_IRQ1 1 |
| 60 | #define GP_IRQ2 2 |
| 61 | #define GP_IRQ3 3 |
| 62 | #define GP_IRQ4 4 |
| 63 | #define GP_IRQ5 5 |
| 64 | #define GENI_OVERRUN 6 |
| 65 | #define GENI_ILLEGAL_CMD 7 |
| 66 | #define GENI_ABORT_DONE 8 |
| 67 | #define GENI_TIMEOUT 9 |
| 68 | |
| 69 | #define I2C_NACK GP_IRQ1 |
| 70 | #define I2C_BUS_PROTO GP_IRQ3 |
| 71 | #define I2C_ARB_LOST GP_IRQ4 |
| 72 | #define DM_I2C_RX_ERR ((GP_IRQ1 | GP_IRQ3 | GP_IRQ4) >> 4) |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 73 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 74 | struct geni_i2c_dev { |
| 75 | struct device *dev; |
| 76 | void __iomem *base; |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 77 | unsigned int tx_wm; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 78 | int irq; |
| 79 | int err; |
| 80 | struct i2c_adapter adap; |
| 81 | struct completion xfer; |
| 82 | struct i2c_msg *cur; |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 83 | struct se_geni_rsc i2c_rsc; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 84 | int cur_wr; |
| 85 | int cur_rd; |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 86 | struct device *wrapper_dev; |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 87 | void *ipcl; |
| 88 | }; |
| 89 | |
| 90 | struct geni_i2c_err_log { |
| 91 | int err; |
| 92 | const char *msg; |
| 93 | }; |
| 94 | |
| 95 | static struct geni_i2c_err_log gi2c_log[] = { |
| 96 | [GP_IRQ0] = {-EINVAL, "Unknown I2C err GP_IRQ0"}, |
| 97 | [I2C_NACK] = {-ENOTCONN, |
| 98 | "NACK: slv unresponsive, check its power/reset-ln"}, |
| 99 | [GP_IRQ2] = {-EINVAL, "Unknown I2C err GP IRQ2"}, |
| 100 | [I2C_BUS_PROTO] = {-EPROTO, |
| 101 | "Bus proto err, noisy/unepxected start/stop"}, |
| 102 | [I2C_ARB_LOST] = {-EBUSY, |
| 103 | "Bus arbitration lost, clock line undriveable"}, |
| 104 | [GP_IRQ5] = {-EINVAL, "Unknown I2C err GP IRQ5"}, |
| 105 | [GENI_OVERRUN] = {-EIO, "Cmd overrun, check GENI cmd-state machine"}, |
| 106 | [GENI_ILLEGAL_CMD] = {-EILSEQ, |
| 107 | "Illegal cmd, check GENI cmd-state machine"}, |
| 108 | [GENI_ABORT_DONE] = {-ETIMEDOUT, "Abort after timeout successful"}, |
| 109 | [GENI_TIMEOUT] = {-ETIMEDOUT, "I2C TXN timed out"}, |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 110 | }; |
| 111 | |
| 112 | static inline void qcom_geni_i2c_conf(void __iomem *base, int dfs, int div) |
| 113 | { |
| 114 | geni_write_reg(dfs, base, SE_GENI_CLK_SEL); |
| 115 | geni_write_reg((div << 4) | 1, base, GENI_SER_M_CLK_CFG); |
| 116 | geni_write_reg(((5 << 20) | (0xC << 10) | 0x18), |
| 117 | base, SE_I2C_SCL_COUNTERS); |
| 118 | /* |
| 119 | * Ensure Clk config completes before return. |
| 120 | */ |
| 121 | mb(); |
| 122 | } |
| 123 | |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 124 | static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err) |
| 125 | { |
| 126 | u32 m_stat = readl_relaxed(gi2c->base + SE_GENI_M_IRQ_STATUS); |
| 127 | u32 rx_st = readl_relaxed(gi2c->base + SE_GENI_RX_FIFO_STATUS); |
| 128 | u32 tx_st = readl_relaxed(gi2c->base + SE_GENI_TX_FIFO_STATUS); |
| 129 | u32 m_cmd = readl_relaxed(gi2c->base + SE_GENI_M_CMD0); |
| 130 | u32 geni_s = readl_relaxed(gi2c->base + SE_GENI_STATUS); |
| 131 | u32 geni_ios = readl_relaxed(gi2c->base + SE_GENI_IOS); |
| 132 | |
| 133 | if (err == I2C_NACK || err == GENI_ABORT_DONE) { |
| 134 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, "%s\n", |
| 135 | gi2c_log[err].msg); |
| 136 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, |
| 137 | "m_stat:0x%x, tx_stat:0x%x, rx_stat:0x%x, ", |
| 138 | m_stat, tx_st, rx_st); |
| 139 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, |
| 140 | "m_cmd:0x%x, geni_status:0x%x, geni_ios:0x%x\n", |
| 141 | m_cmd, geni_s, geni_ios); |
| 142 | } else { |
| 143 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, "%s\n", |
| 144 | gi2c_log[err].msg); |
| 145 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 146 | "m_stat:0x%x, tx_stat:0x%x, rx_stat:0x%x, ", |
| 147 | m_stat, tx_st, rx_st); |
| 148 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 149 | "m_cmd:0x%x, geni_status:0x%x, geni_ios:0x%x\n", |
| 150 | m_cmd, geni_s, geni_ios); |
| 151 | } |
| 152 | gi2c->err = gi2c_log[err].err; |
| 153 | } |
| 154 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 155 | static irqreturn_t geni_i2c_irq(int irq, void *dev) |
| 156 | { |
| 157 | struct geni_i2c_dev *gi2c = dev; |
| 158 | int i, j; |
| 159 | u32 m_stat = readl_relaxed(gi2c->base + SE_GENI_M_IRQ_STATUS); |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 160 | u32 rx_st = readl_relaxed(gi2c->base + SE_GENI_RX_FIFO_STATUS); |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 161 | u32 dm_tx_st = readl_relaxed(gi2c->base + SE_DMA_TX_IRQ_STAT); |
| 162 | u32 dm_rx_st = readl_relaxed(gi2c->base + SE_DMA_RX_IRQ_STAT); |
| 163 | u32 dma = readl_relaxed(gi2c->base + SE_GENI_DMA_MODE_EN); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 164 | struct i2c_msg *cur = gi2c->cur; |
| 165 | |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 166 | if (!cur || (m_stat & M_CMD_FAILURE_EN) || |
| 167 | (dm_rx_st & (DM_I2C_RX_ERR)) || |
| 168 | (m_stat & M_CMD_ABORT_EN)) { |
| 169 | |
| 170 | if (m_stat & M_GP_IRQ_1_EN) |
| 171 | geni_i2c_err(gi2c, I2C_NACK); |
| 172 | if (m_stat & M_GP_IRQ_3_EN) |
| 173 | geni_i2c_err(gi2c, I2C_BUS_PROTO); |
| 174 | if (m_stat & M_GP_IRQ_4_EN) |
| 175 | geni_i2c_err(gi2c, I2C_ARB_LOST); |
| 176 | if (m_stat & M_CMD_OVERRUN_EN) |
| 177 | geni_i2c_err(gi2c, GENI_OVERRUN); |
| 178 | if (m_stat & M_ILLEGAL_CMD_EN) |
| 179 | geni_i2c_err(gi2c, GENI_ILLEGAL_CMD); |
| 180 | if (m_stat & M_CMD_ABORT_EN) |
| 181 | geni_i2c_err(gi2c, GENI_ABORT_DONE); |
| 182 | if (m_stat & M_GP_IRQ_0_EN) |
| 183 | geni_i2c_err(gi2c, GP_IRQ0); |
| 184 | |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 185 | if (!dma) |
| 186 | writel_relaxed(0, (gi2c->base + |
| 187 | SE_GENI_TX_WATERMARK_REG)); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 188 | gi2c->err = -EIO; |
| 189 | goto irqret; |
| 190 | } |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 191 | |
| 192 | if (dma) { |
| 193 | dev_dbg(gi2c->dev, "i2c dma tx:0x%x, dma rx:0x%x\n", dm_tx_st, |
| 194 | dm_rx_st); |
| 195 | goto irqret; |
| 196 | } |
| 197 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 198 | if (((m_stat & M_RX_FIFO_WATERMARK_EN) || |
| 199 | (m_stat & M_RX_FIFO_LAST_EN)) && (cur->flags & I2C_M_RD)) { |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 200 | u32 rxcnt = rx_st & RX_FIFO_WC_MSK; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 201 | |
| 202 | for (j = 0; j < rxcnt; j++) { |
| 203 | u32 temp; |
| 204 | int p; |
| 205 | |
| 206 | temp = readl_relaxed(gi2c->base + SE_GENI_RX_FIFOn); |
| 207 | for (i = gi2c->cur_rd, p = 0; (i < cur->len && p < 4); |
| 208 | i++, p++) |
| 209 | cur->buf[i] = (u8) ((temp >> (p * 8)) & 0xff); |
| 210 | gi2c->cur_rd = i; |
| 211 | if (gi2c->cur_rd == cur->len) { |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 212 | dev_dbg(gi2c->dev, "FIFO i:%d,read 0x%x\n", |
| 213 | i, temp); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 214 | break; |
| 215 | } |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 216 | } |
| 217 | } else if ((m_stat & M_TX_FIFO_WATERMARK_EN) && |
| 218 | !(cur->flags & I2C_M_RD)) { |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 219 | for (j = 0; j < gi2c->tx_wm; j++) { |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 220 | u32 temp = 0; |
| 221 | int p; |
| 222 | |
| 223 | for (i = gi2c->cur_wr, p = 0; (i < cur->len && p < 4); |
| 224 | i++, p++) |
| 225 | temp |= (((u32)(cur->buf[i]) << (p * 8))); |
| 226 | writel_relaxed(temp, gi2c->base + SE_GENI_TX_FIFOn); |
| 227 | gi2c->cur_wr = i; |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 228 | dev_dbg(gi2c->dev, "FIFO i:%d,wrote 0x%x\n", i, temp); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 229 | if (gi2c->cur_wr == cur->len) { |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 230 | dev_dbg(gi2c->dev, "FIFO i2c bytes done writing\n"); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 231 | writel_relaxed(0, |
| 232 | (gi2c->base + SE_GENI_TX_WATERMARK_REG)); |
| 233 | break; |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | irqret: |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 238 | if (m_stat) |
| 239 | writel_relaxed(m_stat, gi2c->base + SE_GENI_M_IRQ_CLEAR); |
| 240 | |
| 241 | if (dma) { |
| 242 | if (dm_tx_st) |
| 243 | writel_relaxed(dm_tx_st, gi2c->base + |
| 244 | SE_DMA_TX_IRQ_CLR); |
| 245 | if (dm_rx_st) |
| 246 | writel_relaxed(dm_rx_st, gi2c->base + |
| 247 | SE_DMA_RX_IRQ_CLR); |
| 248 | /* Ensure all writes are done before returning from ISR. */ |
| 249 | wmb(); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 250 | } |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 251 | /* if this is err with done-bit not set, handle that thr' timeout. */ |
| 252 | if (m_stat & M_CMD_DONE_EN) |
| 253 | complete(&gi2c->xfer); |
| 254 | else if ((dm_tx_st & TX_DMA_DONE) || (dm_rx_st & RX_DMA_DONE)) |
| 255 | complete(&gi2c->xfer); |
| 256 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 257 | return IRQ_HANDLED; |
| 258 | } |
| 259 | |
| 260 | static int geni_i2c_xfer(struct i2c_adapter *adap, |
| 261 | struct i2c_msg msgs[], |
| 262 | int num) |
| 263 | { |
| 264 | struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap); |
| 265 | int i, ret = 0, timeout = 0; |
| 266 | |
| 267 | gi2c->err = 0; |
| 268 | gi2c->cur = &msgs[0]; |
| 269 | reinit_completion(&gi2c->xfer); |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 270 | ret = pm_runtime_get_sync(gi2c->dev); |
| 271 | if (ret < 0) { |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 272 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 273 | "error turning SE resources:%d\n", ret); |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 274 | pm_runtime_put_noidle(gi2c->dev); |
| 275 | /* Set device in suspended since resume failed */ |
| 276 | pm_runtime_set_suspended(gi2c->dev); |
| 277 | return ret; |
| 278 | } |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 279 | qcom_geni_i2c_conf(gi2c->base, 0, 2); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 280 | dev_dbg(gi2c->dev, "i2c xfer:num:%d, msgs:len:%d,flg:%d\n", |
| 281 | num, msgs[0].len, msgs[0].flags); |
| 282 | for (i = 0; i < num; i++) { |
| 283 | int stretch = (i < (num - 1)); |
| 284 | u32 m_param = 0; |
| 285 | u32 m_cmd = 0; |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 286 | dma_addr_t tx_dma = 0; |
| 287 | dma_addr_t rx_dma = 0; |
| 288 | enum se_xfer_mode mode = FIFO_MODE; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 289 | |
Girish Mahadevan | d5890b2 | 2017-03-30 13:20:02 -0600 | [diff] [blame] | 290 | m_param |= (stretch ? STOP_STRETCH : 0); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 291 | m_param |= ((msgs[i].addr & 0x7F) << SLV_ADDR_SHFT); |
| 292 | |
| 293 | gi2c->cur = &msgs[i]; |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 294 | mode = msgs[i].len > 32 ? SE_DMA : FIFO_MODE; |
| 295 | ret = geni_se_select_mode(gi2c->base, mode); |
| 296 | if (ret) { |
| 297 | dev_err(gi2c->dev, "%s: Error mode init %d:%d:%d\n", |
| 298 | __func__, mode, i, msgs[i].len); |
| 299 | break; |
| 300 | } |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 301 | if (msgs[i].flags & I2C_M_RD) { |
| 302 | dev_dbg(gi2c->dev, |
| 303 | "READ,n:%d,i:%d len:%d, stretch:%d\n", |
| 304 | num, i, msgs[i].len, stretch); |
| 305 | geni_write_reg(msgs[i].len, |
| 306 | gi2c->base, SE_I2C_RX_TRANS_LEN); |
| 307 | m_cmd = I2C_READ; |
| 308 | geni_setup_m_cmd(gi2c->base, m_cmd, m_param); |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 309 | if (mode == SE_DMA) { |
| 310 | ret = geni_se_rx_dma_prep(gi2c->wrapper_dev, |
| 311 | gi2c->base, msgs[i].buf, |
| 312 | msgs[i].len, &rx_dma); |
| 313 | if (ret) |
| 314 | mode = FIFO_MODE; |
| 315 | } |
| 316 | if (mode == FIFO_MODE) |
| 317 | geni_se_select_mode(gi2c->base, mode); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 318 | } else { |
| 319 | dev_dbg(gi2c->dev, |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 320 | "WRITE:n:%d,i:%d len:%d, stretch:%d, m_param:0x%x\n", |
| 321 | num, i, msgs[i].len, stretch, m_param); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 322 | geni_write_reg(msgs[i].len, gi2c->base, |
| 323 | SE_I2C_TX_TRANS_LEN); |
| 324 | m_cmd = I2C_WRITE; |
| 325 | geni_setup_m_cmd(gi2c->base, m_cmd, m_param); |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 326 | if (mode == SE_DMA) { |
| 327 | ret = geni_se_tx_dma_prep(gi2c->wrapper_dev, |
| 328 | gi2c->base, msgs[i].buf, |
| 329 | msgs[i].len, &tx_dma); |
| 330 | if (ret) |
| 331 | mode = FIFO_MODE; |
| 332 | } |
| 333 | if (mode == FIFO_MODE) { |
| 334 | geni_se_select_mode(gi2c->base, mode); |
| 335 | /* Get FIFO IRQ */ |
| 336 | geni_write_reg(1, gi2c->base, |
| 337 | SE_GENI_TX_WATERMARK_REG); |
| 338 | } |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 339 | } |
| 340 | /* Ensure FIFO write go through before waiting for Done evet */ |
| 341 | mb(); |
| 342 | timeout = wait_for_completion_timeout(&gi2c->xfer, HZ); |
| 343 | if (!timeout) { |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 344 | geni_i2c_err(gi2c, GENI_TIMEOUT); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 345 | gi2c->cur = NULL; |
| 346 | geni_abort_m_cmd(gi2c->base); |
| 347 | timeout = wait_for_completion_timeout(&gi2c->xfer, HZ); |
| 348 | } |
| 349 | gi2c->cur_wr = 0; |
| 350 | gi2c->cur_rd = 0; |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 351 | if (mode == SE_DMA) { |
| 352 | if (gi2c->err) { |
| 353 | if (msgs[i].flags != I2C_M_RD) |
| 354 | writel_relaxed(1, gi2c->base + |
| 355 | SE_DMA_TX_FSM_RST); |
| 356 | else |
| 357 | writel_relaxed(1, gi2c->base + |
| 358 | SE_DMA_RX_FSM_RST); |
| 359 | wait_for_completion_timeout(&gi2c->xfer, HZ); |
| 360 | } |
| 361 | geni_se_rx_dma_unprep(gi2c->wrapper_dev, rx_dma, |
| 362 | msgs[i].len); |
| 363 | geni_se_tx_dma_unprep(gi2c->wrapper_dev, tx_dma, |
| 364 | msgs[i].len); |
| 365 | } |
| 366 | ret = gi2c->err; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 367 | if (gi2c->err) { |
| 368 | dev_err(gi2c->dev, "i2c error :%d\n", gi2c->err); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 369 | break; |
| 370 | } |
| 371 | } |
| 372 | if (ret == 0) |
| 373 | ret = i; |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 374 | pm_runtime_put_sync(gi2c->dev); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 375 | gi2c->cur = NULL; |
| 376 | gi2c->err = 0; |
| 377 | dev_dbg(gi2c->dev, "i2c txn ret:%d\n", ret); |
| 378 | return ret; |
| 379 | } |
| 380 | |
| 381 | static u32 geni_i2c_func(struct i2c_adapter *adap) |
| 382 | { |
| 383 | return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); |
| 384 | } |
| 385 | |
| 386 | static const struct i2c_algorithm geni_i2c_algo = { |
| 387 | .master_xfer = geni_i2c_xfer, |
| 388 | .functionality = geni_i2c_func, |
| 389 | }; |
| 390 | |
| 391 | static int geni_i2c_probe(struct platform_device *pdev) |
| 392 | { |
| 393 | struct geni_i2c_dev *gi2c; |
| 394 | struct resource *res; |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 395 | struct platform_device *wrapper_pdev; |
| 396 | struct device_node *wrapper_ph_node; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 397 | int ret; |
| 398 | |
| 399 | gi2c = devm_kzalloc(&pdev->dev, sizeof(*gi2c), GFP_KERNEL); |
| 400 | if (!gi2c) |
| 401 | return -ENOMEM; |
| 402 | |
| 403 | gi2c->dev = &pdev->dev; |
| 404 | |
| 405 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 406 | if (!res) |
| 407 | return -EINVAL; |
| 408 | |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 409 | wrapper_ph_node = of_parse_phandle(pdev->dev.of_node, |
| 410 | "qcom,wrapper-core", 0); |
| 411 | if (IS_ERR_OR_NULL(wrapper_ph_node)) { |
| 412 | ret = PTR_ERR(wrapper_ph_node); |
| 413 | dev_err(&pdev->dev, "No wrapper core defined\n"); |
| 414 | return ret; |
| 415 | } |
| 416 | wrapper_pdev = of_find_device_by_node(wrapper_ph_node); |
| 417 | of_node_put(wrapper_ph_node); |
| 418 | if (IS_ERR_OR_NULL(wrapper_pdev)) { |
| 419 | ret = PTR_ERR(wrapper_pdev); |
| 420 | dev_err(&pdev->dev, "Cannot retrieve wrapper device\n"); |
| 421 | return ret; |
| 422 | } |
| 423 | gi2c->wrapper_dev = &wrapper_pdev->dev; |
| 424 | gi2c->i2c_rsc.wrapper_dev = &wrapper_pdev->dev; |
| 425 | ret = geni_se_resources_init(&gi2c->i2c_rsc, I2C_CORE2X_VOTE, |
| 426 | (DEFAULT_SE_CLK * DEFAULT_BUS_WIDTH)); |
| 427 | if (ret) { |
| 428 | dev_err(gi2c->dev, "geni_se_resources_init\n"); |
| 429 | return ret; |
| 430 | } |
| 431 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 432 | gi2c->i2c_rsc.se_clk = devm_clk_get(&pdev->dev, "se-clk"); |
| 433 | if (IS_ERR(gi2c->i2c_rsc.se_clk)) { |
| 434 | ret = PTR_ERR(gi2c->i2c_rsc.se_clk); |
| 435 | dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret); |
| 436 | return ret; |
| 437 | } |
| 438 | |
| 439 | gi2c->i2c_rsc.m_ahb_clk = devm_clk_get(&pdev->dev, "m-ahb"); |
| 440 | if (IS_ERR(gi2c->i2c_rsc.m_ahb_clk)) { |
| 441 | ret = PTR_ERR(gi2c->i2c_rsc.m_ahb_clk); |
| 442 | dev_err(&pdev->dev, "Err getting M AHB clk %d\n", ret); |
| 443 | return ret; |
| 444 | } |
| 445 | |
| 446 | gi2c->i2c_rsc.s_ahb_clk = devm_clk_get(&pdev->dev, "s-ahb"); |
| 447 | if (IS_ERR(gi2c->i2c_rsc.s_ahb_clk)) { |
| 448 | ret = PTR_ERR(gi2c->i2c_rsc.s_ahb_clk); |
| 449 | dev_err(&pdev->dev, "Err getting S AHB clk %d\n", ret); |
| 450 | return ret; |
| 451 | } |
| 452 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 453 | gi2c->base = devm_ioremap_resource(gi2c->dev, res); |
| 454 | if (IS_ERR(gi2c->base)) |
| 455 | return PTR_ERR(gi2c->base); |
| 456 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 457 | gi2c->i2c_rsc.geni_pinctrl = devm_pinctrl_get(&pdev->dev); |
| 458 | if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_pinctrl)) { |
| 459 | dev_err(&pdev->dev, "No pinctrl config specified\n"); |
| 460 | ret = PTR_ERR(gi2c->i2c_rsc.geni_pinctrl); |
| 461 | return ret; |
| 462 | } |
| 463 | gi2c->i2c_rsc.geni_gpio_active = |
| 464 | pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl, |
| 465 | PINCTRL_DEFAULT); |
| 466 | if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_active)) { |
| 467 | dev_err(&pdev->dev, "No default config specified\n"); |
| 468 | ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_active); |
| 469 | return ret; |
| 470 | } |
| 471 | gi2c->i2c_rsc.geni_gpio_sleep = |
| 472 | pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl, |
| 473 | PINCTRL_SLEEP); |
| 474 | if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_sleep)) { |
| 475 | dev_err(&pdev->dev, "No sleep config specified\n"); |
| 476 | ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_sleep); |
| 477 | return ret; |
| 478 | } |
| 479 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 480 | gi2c->irq = platform_get_irq(pdev, 0); |
| 481 | if (gi2c->irq < 0) { |
| 482 | dev_err(gi2c->dev, "IRQ error for i2c-geni\n"); |
| 483 | return gi2c->irq; |
| 484 | } |
| 485 | |
| 486 | gi2c->adap.algo = &geni_i2c_algo; |
| 487 | init_completion(&gi2c->xfer); |
| 488 | platform_set_drvdata(pdev, gi2c); |
| 489 | ret = devm_request_irq(gi2c->dev, gi2c->irq, geni_i2c_irq, |
| 490 | IRQF_TRIGGER_HIGH, "i2c_geni", gi2c); |
| 491 | if (ret) { |
| 492 | dev_err(gi2c->dev, "Request_irq failed:%d: err:%d\n", |
| 493 | gi2c->irq, ret); |
| 494 | return ret; |
| 495 | } |
| 496 | disable_irq(gi2c->irq); |
| 497 | i2c_set_adapdata(&gi2c->adap, gi2c); |
| 498 | gi2c->adap.dev.parent = gi2c->dev; |
| 499 | gi2c->adap.dev.of_node = pdev->dev.of_node; |
| 500 | |
| 501 | strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name)); |
| 502 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 503 | pm_runtime_set_suspended(gi2c->dev); |
| 504 | pm_runtime_enable(gi2c->dev); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 505 | i2c_add_adapter(&gi2c->adap); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 506 | |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 507 | dev_dbg(gi2c->dev, "I2C probed\n"); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | static int geni_i2c_remove(struct platform_device *pdev) |
| 512 | { |
| 513 | struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev); |
| 514 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 515 | pm_runtime_disable(gi2c->dev); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 516 | i2c_del_adapter(&gi2c->adap); |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 517 | if (gi2c->ipcl) |
| 518 | ipc_log_context_destroy(gi2c->ipcl); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 519 | return 0; |
| 520 | } |
| 521 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 522 | static int geni_i2c_resume_noirq(struct device *device) |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 523 | { |
| 524 | return 0; |
| 525 | } |
| 526 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 527 | #ifdef CONFIG_PM |
| 528 | static int geni_i2c_runtime_suspend(struct device *dev) |
| 529 | { |
| 530 | struct geni_i2c_dev *gi2c = dev_get_drvdata(dev); |
| 531 | |
| 532 | disable_irq(gi2c->irq); |
| 533 | se_geni_resources_off(&gi2c->i2c_rsc); |
| 534 | return 0; |
| 535 | } |
| 536 | |
| 537 | static int geni_i2c_runtime_resume(struct device *dev) |
| 538 | { |
| 539 | int ret; |
| 540 | struct geni_i2c_dev *gi2c = dev_get_drvdata(dev); |
| 541 | |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 542 | if (!gi2c->ipcl) { |
| 543 | char ipc_name[I2C_NAME_SIZE]; |
| 544 | |
| 545 | snprintf(ipc_name, I2C_NAME_SIZE, "i2c-%d", gi2c->adap.nr); |
| 546 | gi2c->ipcl = ipc_log_context_create(2, ipc_name, 0); |
| 547 | } |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 548 | ret = se_geni_resources_on(&gi2c->i2c_rsc); |
| 549 | if (ret) |
| 550 | return ret; |
| 551 | |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 552 | if (unlikely(!gi2c->tx_wm)) { |
| 553 | int gi2c_tx_depth = get_tx_fifo_depth(gi2c->base); |
| 554 | |
| 555 | gi2c->tx_wm = gi2c_tx_depth - 1; |
| 556 | geni_se_init(gi2c->base, gi2c->tx_wm, gi2c_tx_depth); |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 557 | se_config_packing(gi2c->base, 8, 4, true); |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame^] | 558 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, |
| 559 | "i2c fifo depth:%d\n", gi2c_tx_depth); |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 560 | } |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 561 | enable_irq(gi2c->irq); |
| 562 | return 0; |
| 563 | } |
| 564 | |
| 565 | static int geni_i2c_suspend_noirq(struct device *device) |
| 566 | { |
| 567 | if (!pm_runtime_status_suspended(device)) |
| 568 | return -EBUSY; |
| 569 | return 0; |
| 570 | } |
| 571 | #else |
| 572 | static int geni_i2c_runtime_suspend(struct device *dev) |
| 573 | { |
| 574 | return 0; |
| 575 | } |
| 576 | |
| 577 | static int geni_i2c_runtime_resume(struct device *dev) |
| 578 | { |
| 579 | return 0; |
| 580 | } |
| 581 | |
| 582 | static int geni_i2c_suspend_noirq(struct device *device) |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 583 | { |
| 584 | return 0; |
| 585 | } |
| 586 | #endif |
| 587 | |
| 588 | static const struct dev_pm_ops geni_i2c_pm_ops = { |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 589 | .suspend_noirq = geni_i2c_suspend_noirq, |
| 590 | .resume_noirq = geni_i2c_resume_noirq, |
| 591 | .runtime_suspend = geni_i2c_runtime_suspend, |
| 592 | .runtime_resume = geni_i2c_runtime_resume, |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 593 | }; |
| 594 | |
| 595 | static const struct of_device_id geni_i2c_dt_match[] = { |
| 596 | { .compatible = "qcom,i2c-geni" }, |
| 597 | {} |
| 598 | }; |
| 599 | MODULE_DEVICE_TABLE(of, geni_i2c_dt_match); |
| 600 | |
| 601 | static struct platform_driver geni_i2c_driver = { |
| 602 | .probe = geni_i2c_probe, |
| 603 | .remove = geni_i2c_remove, |
| 604 | .driver = { |
| 605 | .name = "i2c_geni", |
| 606 | .pm = &geni_i2c_pm_ops, |
| 607 | .of_match_table = geni_i2c_dt_match, |
| 608 | }, |
| 609 | }; |
| 610 | |
| 611 | module_platform_driver(geni_i2c_driver); |
| 612 | |
| 613 | MODULE_LICENSE("GPL v2"); |
| 614 | MODULE_ALIAS("platform:i2c_geni"); |