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 | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 29 | #include <linux/dmaengine.h> |
| 30 | #include <linux/msm_gpi.h> |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 31 | |
| 32 | #define SE_I2C_TX_TRANS_LEN (0x26C) |
| 33 | #define SE_I2C_RX_TRANS_LEN (0x270) |
| 34 | #define SE_I2C_SCL_COUNTERS (0x278) |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 35 | #define SE_GENI_IOS (0x908) |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 36 | |
| 37 | #define SE_I2C_ERR (M_CMD_OVERRUN_EN | M_ILLEGAL_CMD_EN | M_CMD_FAILURE_EN |\ |
| 38 | M_GP_IRQ_1_EN | M_GP_IRQ_3_EN | M_GP_IRQ_4_EN) |
| 39 | #define SE_I2C_ABORT (1U << 1) |
| 40 | /* M_CMD OP codes for I2C */ |
| 41 | #define I2C_WRITE (0x1) |
| 42 | #define I2C_READ (0x2) |
| 43 | #define I2C_WRITE_READ (0x3) |
| 44 | #define I2C_ADDR_ONLY (0x4) |
| 45 | #define I2C_BUS_CLEAR (0x6) |
| 46 | #define I2C_STOP_ON_BUS (0x7) |
| 47 | /* M_CMD params for I2C */ |
| 48 | #define PRE_CMD_DELAY (BIT(0)) |
| 49 | #define TIMESTAMP_BEFORE (BIT(1)) |
| 50 | #define STOP_STRETCH (BIT(2)) |
| 51 | #define TIMESTAMP_AFTER (BIT(3)) |
| 52 | #define POST_COMMAND_DELAY (BIT(4)) |
| 53 | #define IGNORE_ADD_NACK (BIT(6)) |
| 54 | #define READ_FINISHED_WITH_ACK (BIT(7)) |
| 55 | #define BYPASS_ADDR_PHASE (BIT(8)) |
| 56 | #define SLV_ADDR_MSK (GENMASK(15, 9)) |
| 57 | #define SLV_ADDR_SHFT (9) |
| 58 | |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 59 | #define I2C_PACK_EN (BIT(0) | BIT(1)) |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 60 | #define I2C_CORE2X_VOTE (10000) |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 61 | #define GP_IRQ0 0 |
| 62 | #define GP_IRQ1 1 |
| 63 | #define GP_IRQ2 2 |
| 64 | #define GP_IRQ3 3 |
| 65 | #define GP_IRQ4 4 |
| 66 | #define GP_IRQ5 5 |
| 67 | #define GENI_OVERRUN 6 |
| 68 | #define GENI_ILLEGAL_CMD 7 |
| 69 | #define GENI_ABORT_DONE 8 |
| 70 | #define GENI_TIMEOUT 9 |
| 71 | |
| 72 | #define I2C_NACK GP_IRQ1 |
| 73 | #define I2C_BUS_PROTO GP_IRQ3 |
| 74 | #define I2C_ARB_LOST GP_IRQ4 |
| 75 | #define DM_I2C_RX_ERR ((GP_IRQ1 | GP_IRQ3 | GP_IRQ4) >> 4) |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 76 | |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 77 | enum i2c_se_mode { |
| 78 | UNINITIALIZED, |
| 79 | FIFO_SE_DMA, |
| 80 | GSI_ONLY, |
| 81 | }; |
| 82 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 83 | struct geni_i2c_dev { |
| 84 | struct device *dev; |
| 85 | void __iomem *base; |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 86 | unsigned int tx_wm; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 87 | int irq; |
| 88 | int err; |
| 89 | struct i2c_adapter adap; |
| 90 | struct completion xfer; |
| 91 | struct i2c_msg *cur; |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 92 | struct se_geni_rsc i2c_rsc; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 93 | int cur_wr; |
| 94 | int cur_rd; |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 95 | struct device *wrapper_dev; |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 96 | void *ipcl; |
Shrey Vijay | 6f23120 | 2017-07-11 11:16:16 +0530 | [diff] [blame] | 97 | int clk_fld_idx; |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 98 | struct dma_chan *tx_c; |
| 99 | struct dma_chan *rx_c; |
| 100 | struct msm_gpi_tre cfg0_t; |
| 101 | struct msm_gpi_tre go_t; |
| 102 | struct msm_gpi_tre tx_t; |
| 103 | struct msm_gpi_tre rx_t; |
| 104 | dma_addr_t tx_ph; |
| 105 | dma_addr_t rx_ph; |
| 106 | struct msm_gpi_ctrl tx_ev; |
| 107 | struct msm_gpi_ctrl rx_ev; |
| 108 | struct scatterlist tx_sg[5]; /* lock, cfg0, go, TX, unlock */ |
| 109 | struct scatterlist rx_sg; |
| 110 | int cfg_sent; |
| 111 | struct dma_async_tx_descriptor *tx_desc; |
| 112 | struct dma_async_tx_descriptor *rx_desc; |
| 113 | struct msm_gpi_dma_async_tx_cb_param tx_cb; |
| 114 | struct msm_gpi_dma_async_tx_cb_param rx_cb; |
| 115 | enum i2c_se_mode se_mode; |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 116 | }; |
| 117 | |
| 118 | struct geni_i2c_err_log { |
| 119 | int err; |
| 120 | const char *msg; |
| 121 | }; |
| 122 | |
| 123 | static struct geni_i2c_err_log gi2c_log[] = { |
| 124 | [GP_IRQ0] = {-EINVAL, "Unknown I2C err GP_IRQ0"}, |
| 125 | [I2C_NACK] = {-ENOTCONN, |
| 126 | "NACK: slv unresponsive, check its power/reset-ln"}, |
| 127 | [GP_IRQ2] = {-EINVAL, "Unknown I2C err GP IRQ2"}, |
| 128 | [I2C_BUS_PROTO] = {-EPROTO, |
| 129 | "Bus proto err, noisy/unepxected start/stop"}, |
| 130 | [I2C_ARB_LOST] = {-EBUSY, |
| 131 | "Bus arbitration lost, clock line undriveable"}, |
| 132 | [GP_IRQ5] = {-EINVAL, "Unknown I2C err GP IRQ5"}, |
| 133 | [GENI_OVERRUN] = {-EIO, "Cmd overrun, check GENI cmd-state machine"}, |
| 134 | [GENI_ILLEGAL_CMD] = {-EILSEQ, |
| 135 | "Illegal cmd, check GENI cmd-state machine"}, |
| 136 | [GENI_ABORT_DONE] = {-ETIMEDOUT, "Abort after timeout successful"}, |
| 137 | [GENI_TIMEOUT] = {-ETIMEDOUT, "I2C TXN timed out"}, |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 138 | }; |
| 139 | |
Shrey Vijay | 6f23120 | 2017-07-11 11:16:16 +0530 | [diff] [blame] | 140 | struct geni_i2c_clk_fld { |
| 141 | u32 clk_freq_out; |
| 142 | u8 clk_div; |
| 143 | u8 t_high; |
| 144 | u8 t_low; |
| 145 | u8 t_cycle; |
| 146 | }; |
| 147 | |
| 148 | static struct geni_i2c_clk_fld geni_i2c_clk_map[] = { |
| 149 | {KHz(100), 7, 10, 11, 26}, |
| 150 | {KHz(400), 2, 5, 12, 24}, |
| 151 | {KHz(1000), 1, 3, 9, 18}, |
| 152 | }; |
| 153 | |
| 154 | static int geni_i2c_clk_map_idx(struct geni_i2c_dev *gi2c) |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 155 | { |
Shrey Vijay | 6f23120 | 2017-07-11 11:16:16 +0530 | [diff] [blame] | 156 | int i; |
| 157 | int ret = 0; |
| 158 | bool clk_map_present = false; |
| 159 | struct geni_i2c_clk_fld *itr = geni_i2c_clk_map; |
| 160 | |
| 161 | for (i = 0; i < ARRAY_SIZE(geni_i2c_clk_map); i++, itr++) { |
| 162 | if (itr->clk_freq_out == gi2c->i2c_rsc.clk_freq_out) { |
| 163 | clk_map_present = true; |
| 164 | break; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | if (clk_map_present) |
| 169 | gi2c->clk_fld_idx = i; |
| 170 | else |
| 171 | ret = -EINVAL; |
| 172 | |
| 173 | return ret; |
| 174 | } |
| 175 | |
| 176 | static inline void qcom_geni_i2c_conf(struct geni_i2c_dev *gi2c, int dfs) |
| 177 | { |
| 178 | struct geni_i2c_clk_fld *itr = geni_i2c_clk_map + gi2c->clk_fld_idx; |
| 179 | |
| 180 | geni_write_reg(dfs, gi2c->base, SE_GENI_CLK_SEL); |
| 181 | |
| 182 | geni_write_reg((itr->clk_div << 4) | 1, gi2c->base, GENI_SER_M_CLK_CFG); |
| 183 | geni_write_reg(((itr->t_high << 20) | (itr->t_low << 10) | |
| 184 | itr->t_cycle), gi2c->base, SE_I2C_SCL_COUNTERS); |
| 185 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 186 | /* |
Shrey Vijay | 6f23120 | 2017-07-11 11:16:16 +0530 | [diff] [blame] | 187 | * Ensure Clk config completes before return. |
| 188 | */ |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 189 | mb(); |
| 190 | } |
| 191 | |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 192 | static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err) |
| 193 | { |
Sagar Dharia | 1bfc8d1 | 2017-06-29 17:50:18 -0600 | [diff] [blame] | 194 | if (gi2c->cur) |
| 195 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, |
| 196 | "len:%d, slv-addr:0x%x, RD/WR:%d\n", gi2c->cur->len, |
| 197 | gi2c->cur->addr, gi2c->cur->flags); |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 198 | |
| 199 | if (err == I2C_NACK || err == GENI_ABORT_DONE) { |
| 200 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, "%s\n", |
Sagar Dharia | 1bfc8d1 | 2017-06-29 17:50:18 -0600 | [diff] [blame] | 201 | gi2c_log[err].msg); |
| 202 | goto err_ret; |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 203 | } else { |
| 204 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, "%s\n", |
| 205 | gi2c_log[err].msg); |
Sagar Dharia | 1bfc8d1 | 2017-06-29 17:50:18 -0600 | [diff] [blame] | 206 | } |
Girish Mahadevan | 3b7e974 | 2017-09-15 15:17:16 -0600 | [diff] [blame] | 207 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, "%s: se-mode:%d\n", __func__, |
| 208 | gi2c->se_mode); |
| 209 | geni_se_dump_dbg_regs(&gi2c->i2c_rsc, gi2c->base, gi2c->ipcl); |
Sagar Dharia | 1bfc8d1 | 2017-06-29 17:50:18 -0600 | [diff] [blame] | 210 | err_ret: |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 211 | gi2c->err = gi2c_log[err].err; |
| 212 | } |
| 213 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 214 | static irqreturn_t geni_i2c_irq(int irq, void *dev) |
| 215 | { |
| 216 | struct geni_i2c_dev *gi2c = dev; |
| 217 | int i, j; |
| 218 | u32 m_stat = readl_relaxed(gi2c->base + SE_GENI_M_IRQ_STATUS); |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 219 | u32 rx_st = readl_relaxed(gi2c->base + SE_GENI_RX_FIFO_STATUS); |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 220 | u32 dm_tx_st = readl_relaxed(gi2c->base + SE_DMA_TX_IRQ_STAT); |
| 221 | u32 dm_rx_st = readl_relaxed(gi2c->base + SE_DMA_RX_IRQ_STAT); |
| 222 | u32 dma = readl_relaxed(gi2c->base + SE_GENI_DMA_MODE_EN); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 223 | struct i2c_msg *cur = gi2c->cur; |
| 224 | |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 225 | if (!cur || (m_stat & M_CMD_FAILURE_EN) || |
| 226 | (dm_rx_st & (DM_I2C_RX_ERR)) || |
| 227 | (m_stat & M_CMD_ABORT_EN)) { |
| 228 | |
| 229 | if (m_stat & M_GP_IRQ_1_EN) |
| 230 | geni_i2c_err(gi2c, I2C_NACK); |
| 231 | if (m_stat & M_GP_IRQ_3_EN) |
| 232 | geni_i2c_err(gi2c, I2C_BUS_PROTO); |
| 233 | if (m_stat & M_GP_IRQ_4_EN) |
| 234 | geni_i2c_err(gi2c, I2C_ARB_LOST); |
| 235 | if (m_stat & M_CMD_OVERRUN_EN) |
| 236 | geni_i2c_err(gi2c, GENI_OVERRUN); |
| 237 | if (m_stat & M_ILLEGAL_CMD_EN) |
| 238 | geni_i2c_err(gi2c, GENI_ILLEGAL_CMD); |
| 239 | if (m_stat & M_CMD_ABORT_EN) |
| 240 | geni_i2c_err(gi2c, GENI_ABORT_DONE); |
| 241 | if (m_stat & M_GP_IRQ_0_EN) |
| 242 | geni_i2c_err(gi2c, GP_IRQ0); |
| 243 | |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 244 | if (!dma) |
| 245 | writel_relaxed(0, (gi2c->base + |
| 246 | SE_GENI_TX_WATERMARK_REG)); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 247 | goto irqret; |
| 248 | } |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 249 | |
| 250 | if (dma) { |
| 251 | dev_dbg(gi2c->dev, "i2c dma tx:0x%x, dma rx:0x%x\n", dm_tx_st, |
| 252 | dm_rx_st); |
| 253 | goto irqret; |
| 254 | } |
| 255 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 256 | if (((m_stat & M_RX_FIFO_WATERMARK_EN) || |
| 257 | (m_stat & M_RX_FIFO_LAST_EN)) && (cur->flags & I2C_M_RD)) { |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 258 | u32 rxcnt = rx_st & RX_FIFO_WC_MSK; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 259 | |
| 260 | for (j = 0; j < rxcnt; j++) { |
| 261 | u32 temp; |
| 262 | int p; |
| 263 | |
| 264 | temp = readl_relaxed(gi2c->base + SE_GENI_RX_FIFOn); |
| 265 | for (i = gi2c->cur_rd, p = 0; (i < cur->len && p < 4); |
| 266 | i++, p++) |
| 267 | cur->buf[i] = (u8) ((temp >> (p * 8)) & 0xff); |
| 268 | gi2c->cur_rd = i; |
| 269 | if (gi2c->cur_rd == cur->len) { |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 270 | dev_dbg(gi2c->dev, "FIFO i:%d,read 0x%x\n", |
| 271 | i, temp); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 272 | break; |
| 273 | } |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 274 | } |
| 275 | } else if ((m_stat & M_TX_FIFO_WATERMARK_EN) && |
| 276 | !(cur->flags & I2C_M_RD)) { |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 277 | for (j = 0; j < gi2c->tx_wm; j++) { |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 278 | u32 temp = 0; |
| 279 | int p; |
| 280 | |
| 281 | for (i = gi2c->cur_wr, p = 0; (i < cur->len && p < 4); |
| 282 | i++, p++) |
| 283 | temp |= (((u32)(cur->buf[i]) << (p * 8))); |
| 284 | writel_relaxed(temp, gi2c->base + SE_GENI_TX_FIFOn); |
| 285 | gi2c->cur_wr = i; |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 286 | 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] | 287 | if (gi2c->cur_wr == cur->len) { |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 288 | dev_dbg(gi2c->dev, "FIFO i2c bytes done writing\n"); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 289 | writel_relaxed(0, |
| 290 | (gi2c->base + SE_GENI_TX_WATERMARK_REG)); |
| 291 | break; |
| 292 | } |
| 293 | } |
| 294 | } |
| 295 | irqret: |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 296 | if (m_stat) |
| 297 | writel_relaxed(m_stat, gi2c->base + SE_GENI_M_IRQ_CLEAR); |
| 298 | |
| 299 | if (dma) { |
| 300 | if (dm_tx_st) |
| 301 | writel_relaxed(dm_tx_st, gi2c->base + |
| 302 | SE_DMA_TX_IRQ_CLR); |
| 303 | if (dm_rx_st) |
| 304 | writel_relaxed(dm_rx_st, gi2c->base + |
| 305 | SE_DMA_RX_IRQ_CLR); |
| 306 | /* Ensure all writes are done before returning from ISR. */ |
| 307 | wmb(); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 308 | } |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 309 | /* if this is err with done-bit not set, handle that thr' timeout. */ |
| 310 | if (m_stat & M_CMD_DONE_EN) |
| 311 | complete(&gi2c->xfer); |
| 312 | else if ((dm_tx_st & TX_DMA_DONE) || (dm_rx_st & RX_DMA_DONE)) |
| 313 | complete(&gi2c->xfer); |
| 314 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 315 | return IRQ_HANDLED; |
| 316 | } |
| 317 | |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 318 | static void gi2c_ev_cb(struct dma_chan *ch, struct msm_gpi_cb const *cb_str, |
| 319 | void *ptr) |
| 320 | { |
| 321 | struct geni_i2c_dev *gi2c = ptr; |
| 322 | u32 m_stat = cb_str->status; |
| 323 | |
| 324 | switch (cb_str->cb_event) { |
| 325 | case MSM_GPI_QUP_ERROR: |
| 326 | case MSM_GPI_QUP_SW_ERROR: |
| 327 | case MSM_GPI_QUP_MAX_EVENT: |
| 328 | /* fall through to stall impacted channel */ |
| 329 | case MSM_GPI_QUP_CH_ERROR: |
| 330 | case MSM_GPI_QUP_PENDING_EVENT: |
| 331 | case MSM_GPI_QUP_EOT_DESC_MISMATCH: |
| 332 | break; |
| 333 | case MSM_GPI_QUP_NOTIFY: |
| 334 | if (m_stat & M_GP_IRQ_1_EN) |
| 335 | geni_i2c_err(gi2c, I2C_NACK); |
| 336 | if (m_stat & M_GP_IRQ_3_EN) |
| 337 | geni_i2c_err(gi2c, I2C_BUS_PROTO); |
| 338 | if (m_stat & M_GP_IRQ_4_EN) |
| 339 | geni_i2c_err(gi2c, I2C_ARB_LOST); |
| 340 | complete(&gi2c->xfer); |
| 341 | break; |
| 342 | default: |
| 343 | break; |
| 344 | } |
| 345 | if (cb_str->cb_event != MSM_GPI_QUP_NOTIFY) |
| 346 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 347 | "GSI QN err:0x%x, status:0x%x, err:%d\n", |
| 348 | cb_str->error_log.error_code, |
| 349 | m_stat, cb_str->cb_event); |
| 350 | } |
| 351 | |
| 352 | static void gi2c_gsi_tx_cb(void *ptr) |
| 353 | { |
| 354 | struct msm_gpi_dma_async_tx_cb_param *tx_cb = ptr; |
| 355 | struct geni_i2c_dev *gi2c = tx_cb->userdata; |
| 356 | |
| 357 | if (!(gi2c->cur->flags & I2C_M_RD)) |
| 358 | complete(&gi2c->xfer); |
| 359 | } |
| 360 | |
| 361 | static void gi2c_gsi_rx_cb(void *ptr) |
| 362 | { |
| 363 | struct msm_gpi_dma_async_tx_cb_param *rx_cb = ptr; |
| 364 | struct geni_i2c_dev *gi2c = rx_cb->userdata; |
| 365 | |
| 366 | if (gi2c->cur->flags & I2C_M_RD) { |
| 367 | if (rx_cb->status & DM_I2C_RX_ERR) { |
| 368 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, |
| 369 | "RX TCE Unexpected Err, stat:0x%x\n", |
| 370 | rx_cb->status); |
| 371 | if (rx_cb->status & GP_IRQ1) |
| 372 | geni_i2c_err(gi2c, I2C_NACK); |
| 373 | if (rx_cb->status & GP_IRQ3) |
| 374 | geni_i2c_err(gi2c, I2C_BUS_PROTO); |
| 375 | if (rx_cb->status & GP_IRQ4) |
| 376 | geni_i2c_err(gi2c, I2C_ARB_LOST); |
| 377 | } |
| 378 | complete(&gi2c->xfer); |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | static int geni_i2c_gsi_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], |
| 383 | int num) |
| 384 | { |
| 385 | struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap); |
| 386 | int i, ret = 0, timeout = 0; |
| 387 | |
| 388 | if (!gi2c->tx_c) { |
| 389 | gi2c->tx_c = dma_request_slave_channel(gi2c->dev, "tx"); |
| 390 | if (!gi2c->tx_c) { |
| 391 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 392 | "tx dma req slv chan ret :%d\n", ret); |
| 393 | return -EIO; |
| 394 | } |
| 395 | gi2c->tx_ev.init.callback = gi2c_ev_cb; |
| 396 | gi2c->tx_ev.init.cb_param = gi2c; |
| 397 | gi2c->tx_ev.cmd = MSM_GPI_INIT; |
| 398 | gi2c->tx_c->private = &gi2c->tx_ev; |
| 399 | ret = dmaengine_slave_config(gi2c->tx_c, NULL); |
| 400 | if (ret) { |
| 401 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 402 | "tx dma slave config ret :%d\n", ret); |
| 403 | return ret; |
| 404 | } |
| 405 | } |
| 406 | if (!gi2c->rx_c) { |
| 407 | gi2c->rx_c = dma_request_slave_channel(gi2c->dev, "rx"); |
| 408 | if (!gi2c->rx_c) { |
| 409 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 410 | "rx dma req slv chan ret :%d\n", ret); |
| 411 | return -EIO; |
| 412 | } |
| 413 | gi2c->rx_ev.init.cb_param = gi2c; |
| 414 | gi2c->rx_ev.init.callback = gi2c_ev_cb; |
| 415 | gi2c->rx_ev.cmd = MSM_GPI_INIT; |
| 416 | gi2c->rx_c->private = &gi2c->rx_ev; |
| 417 | ret = dmaengine_slave_config(gi2c->rx_c, NULL); |
| 418 | if (ret) { |
| 419 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 420 | "rx dma slave config ret :%d\n", ret); |
| 421 | return ret; |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | if (!gi2c->cfg_sent) { |
| 426 | struct geni_i2c_clk_fld *itr = geni_i2c_clk_map + |
| 427 | gi2c->clk_fld_idx; |
| 428 | struct msm_gpi_tre *cfg0 = &gi2c->cfg0_t; |
| 429 | |
| 430 | /* config0 */ |
| 431 | cfg0->dword[0] = MSM_GPI_I2C_CONFIG0_TRE_DWORD0(I2C_PACK_EN, |
| 432 | itr->t_cycle, |
| 433 | itr->t_high, |
| 434 | itr->t_low); |
| 435 | cfg0->dword[1] = MSM_GPI_I2C_CONFIG0_TRE_DWORD1(0, 0); |
| 436 | cfg0->dword[2] = MSM_GPI_I2C_CONFIG0_TRE_DWORD2(0, |
| 437 | itr->clk_div); |
| 438 | cfg0->dword[3] = MSM_GPI_I2C_CONFIG0_TRE_DWORD3(0, 0, 0, 1); |
| 439 | |
| 440 | gi2c->tx_cb.userdata = gi2c; |
| 441 | gi2c->rx_cb.userdata = gi2c; |
| 442 | } |
| 443 | |
| 444 | for (i = 0; i < num; i++) { |
| 445 | u8 op = (msgs[i].flags & I2C_M_RD) ? 2 : 1; |
| 446 | int segs = 3 - op; |
| 447 | int index = 0; |
| 448 | int stretch = (i < (num - 1)); |
| 449 | dma_cookie_t tx_cookie, rx_cookie; |
| 450 | struct msm_gpi_tre *go_t = &gi2c->go_t; |
Girish Mahadevan | d87fe2e | 2017-09-13 11:44:04 -0600 | [diff] [blame] | 451 | struct device *rx_dev = gi2c->wrapper_dev; |
| 452 | struct device *tx_dev = gi2c->wrapper_dev; |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 453 | |
| 454 | gi2c->cur = &msgs[i]; |
| 455 | if (!gi2c->cfg_sent) { |
| 456 | segs++; |
| 457 | sg_init_table(gi2c->tx_sg, segs); |
| 458 | sg_set_buf(gi2c->tx_sg, &gi2c->cfg0_t, |
| 459 | sizeof(gi2c->cfg0_t)); |
| 460 | gi2c->cfg_sent = 1; |
| 461 | index++; |
| 462 | } else { |
| 463 | sg_init_table(gi2c->tx_sg, segs); |
| 464 | } |
| 465 | |
| 466 | go_t->dword[0] = MSM_GPI_I2C_GO_TRE_DWORD0((stretch << 2), |
| 467 | msgs[i].addr, op); |
| 468 | go_t->dword[1] = MSM_GPI_I2C_GO_TRE_DWORD1; |
| 469 | |
| 470 | if (msgs[i].flags & I2C_M_RD) { |
| 471 | go_t->dword[2] = MSM_GPI_I2C_GO_TRE_DWORD2(msgs[i].len); |
| 472 | go_t->dword[3] = MSM_GPI_I2C_GO_TRE_DWORD3(0, 0, 1, 0); |
| 473 | } else { |
| 474 | go_t->dword[2] = MSM_GPI_I2C_GO_TRE_DWORD2(0); |
| 475 | go_t->dword[3] = MSM_GPI_I2C_GO_TRE_DWORD3(0, 0, 0, 1); |
| 476 | } |
| 477 | |
| 478 | sg_set_buf(&gi2c->tx_sg[index++], &gi2c->go_t, |
| 479 | sizeof(gi2c->go_t)); |
| 480 | |
| 481 | if (msgs[i].flags & I2C_M_RD) { |
| 482 | sg_init_table(&gi2c->rx_sg, 1); |
Girish Mahadevan | d87fe2e | 2017-09-13 11:44:04 -0600 | [diff] [blame] | 483 | geni_se_iommu_map_buf(rx_dev, &gi2c->rx_ph, msgs[i].buf, |
| 484 | msgs[i].len, DMA_FROM_DEVICE); |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 485 | gi2c->rx_t.dword[0] = |
| 486 | MSM_GPI_DMA_W_BUFFER_TRE_DWORD0(gi2c->rx_ph); |
| 487 | gi2c->rx_t.dword[1] = |
| 488 | MSM_GPI_DMA_W_BUFFER_TRE_DWORD1(gi2c->rx_ph); |
| 489 | gi2c->rx_t.dword[2] = |
| 490 | MSM_GPI_DMA_W_BUFFER_TRE_DWORD2(msgs[i].len); |
| 491 | gi2c->rx_t.dword[3] = |
| 492 | MSM_GPI_DMA_W_BUFFER_TRE_DWORD3(0, 1, 0, 0); |
| 493 | |
| 494 | sg_set_buf(&gi2c->rx_sg, &gi2c->rx_t, |
| 495 | sizeof(gi2c->rx_t)); |
| 496 | gi2c->rx_desc = dmaengine_prep_slave_sg(gi2c->rx_c, |
| 497 | &gi2c->rx_sg, 1, |
| 498 | DMA_DEV_TO_MEM, |
| 499 | (DMA_PREP_INTERRUPT | |
| 500 | DMA_CTRL_ACK)); |
| 501 | if (!gi2c->rx_desc) { |
| 502 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 503 | "prep_slave_sg for rx failed\n"); |
| 504 | gi2c->err = -ENOMEM; |
| 505 | return gi2c->err; |
| 506 | } |
| 507 | gi2c->rx_desc->callback = gi2c_gsi_rx_cb; |
| 508 | gi2c->rx_desc->callback_param = &gi2c->rx_cb; |
| 509 | |
| 510 | /* Issue RX */ |
| 511 | rx_cookie = dmaengine_submit(gi2c->rx_desc); |
| 512 | dma_async_issue_pending(gi2c->rx_c); |
| 513 | } else { |
Girish Mahadevan | d87fe2e | 2017-09-13 11:44:04 -0600 | [diff] [blame] | 514 | geni_se_iommu_map_buf(tx_dev, &gi2c->tx_ph, msgs[i].buf, |
| 515 | msgs[i].len, DMA_TO_DEVICE); |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 516 | gi2c->tx_t.dword[0] = |
| 517 | MSM_GPI_DMA_W_BUFFER_TRE_DWORD0(gi2c->tx_ph); |
| 518 | gi2c->tx_t.dword[1] = |
| 519 | MSM_GPI_DMA_W_BUFFER_TRE_DWORD1(gi2c->tx_ph); |
| 520 | gi2c->tx_t.dword[2] = |
| 521 | MSM_GPI_DMA_W_BUFFER_TRE_DWORD2(msgs[i].len); |
| 522 | gi2c->tx_t.dword[3] = |
| 523 | MSM_GPI_DMA_W_BUFFER_TRE_DWORD3(0, 1, 0, 0); |
| 524 | |
| 525 | sg_set_buf(&gi2c->tx_sg[index++], &gi2c->tx_t, |
| 526 | sizeof(gi2c->tx_t)); |
| 527 | } |
| 528 | |
| 529 | gi2c->tx_desc = dmaengine_prep_slave_sg(gi2c->tx_c, gi2c->tx_sg, |
| 530 | segs, DMA_MEM_TO_DEV, |
| 531 | (DMA_PREP_INTERRUPT | |
| 532 | DMA_CTRL_ACK)); |
| 533 | if (!gi2c->tx_desc) { |
| 534 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 535 | "prep_slave_sg for tx failed\n"); |
| 536 | gi2c->err = -ENOMEM; |
| 537 | return gi2c->err; |
| 538 | } |
| 539 | gi2c->tx_desc->callback = gi2c_gsi_tx_cb; |
| 540 | gi2c->tx_desc->callback_param = &gi2c->tx_cb; |
| 541 | |
| 542 | /* Issue TX */ |
| 543 | tx_cookie = dmaengine_submit(gi2c->tx_desc); |
| 544 | dma_async_issue_pending(gi2c->tx_c); |
| 545 | |
| 546 | timeout = wait_for_completion_timeout(&gi2c->xfer, HZ); |
| 547 | if (msgs[i].flags & I2C_M_RD) |
Girish Mahadevan | d87fe2e | 2017-09-13 11:44:04 -0600 | [diff] [blame] | 548 | geni_se_iommu_unmap_buf(rx_dev, &gi2c->rx_ph, |
| 549 | msgs[i].len, DMA_FROM_DEVICE); |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 550 | else |
Girish Mahadevan | d87fe2e | 2017-09-13 11:44:04 -0600 | [diff] [blame] | 551 | geni_se_iommu_unmap_buf(tx_dev, &gi2c->tx_ph, |
| 552 | msgs[i].len, DMA_TO_DEVICE); |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 553 | |
| 554 | if (!timeout) { |
| 555 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 556 | "GSI Txn timed out\n"); |
| 557 | gi2c->err = -ETIMEDOUT; |
| 558 | } |
| 559 | if (gi2c->err) { |
| 560 | dmaengine_terminate_all(gi2c->tx_c); |
| 561 | gi2c->cfg_sent = 0; |
| 562 | return gi2c->err; |
| 563 | } |
| 564 | } |
| 565 | return gi2c->err; |
| 566 | } |
| 567 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 568 | static int geni_i2c_xfer(struct i2c_adapter *adap, |
| 569 | struct i2c_msg msgs[], |
| 570 | int num) |
| 571 | { |
| 572 | struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap); |
| 573 | int i, ret = 0, timeout = 0; |
| 574 | |
| 575 | gi2c->err = 0; |
| 576 | gi2c->cur = &msgs[0]; |
| 577 | reinit_completion(&gi2c->xfer); |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 578 | ret = pm_runtime_get_sync(gi2c->dev); |
| 579 | if (ret < 0) { |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 580 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 581 | "error turning SE resources:%d\n", ret); |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 582 | pm_runtime_put_noidle(gi2c->dev); |
| 583 | /* Set device in suspended since resume failed */ |
| 584 | pm_runtime_set_suspended(gi2c->dev); |
| 585 | return ret; |
| 586 | } |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 587 | if (gi2c->se_mode == GSI_ONLY) { |
| 588 | ret = geni_i2c_gsi_xfer(adap, msgs, num); |
| 589 | goto geni_i2c_txn_ret; |
| 590 | } |
| 591 | |
Shrey Vijay | 6f23120 | 2017-07-11 11:16:16 +0530 | [diff] [blame] | 592 | qcom_geni_i2c_conf(gi2c, 0); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 593 | dev_dbg(gi2c->dev, "i2c xfer:num:%d, msgs:len:%d,flg:%d\n", |
| 594 | num, msgs[0].len, msgs[0].flags); |
| 595 | for (i = 0; i < num; i++) { |
| 596 | int stretch = (i < (num - 1)); |
| 597 | u32 m_param = 0; |
| 598 | u32 m_cmd = 0; |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 599 | dma_addr_t tx_dma = 0; |
| 600 | dma_addr_t rx_dma = 0; |
| 601 | enum se_xfer_mode mode = FIFO_MODE; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 602 | |
Girish Mahadevan | d5890b2 | 2017-03-30 13:20:02 -0600 | [diff] [blame] | 603 | m_param |= (stretch ? STOP_STRETCH : 0); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 604 | m_param |= ((msgs[i].addr & 0x7F) << SLV_ADDR_SHFT); |
| 605 | |
| 606 | gi2c->cur = &msgs[i]; |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 607 | mode = msgs[i].len > 32 ? SE_DMA : FIFO_MODE; |
| 608 | ret = geni_se_select_mode(gi2c->base, mode); |
| 609 | if (ret) { |
| 610 | dev_err(gi2c->dev, "%s: Error mode init %d:%d:%d\n", |
| 611 | __func__, mode, i, msgs[i].len); |
| 612 | break; |
| 613 | } |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 614 | if (msgs[i].flags & I2C_M_RD) { |
| 615 | dev_dbg(gi2c->dev, |
| 616 | "READ,n:%d,i:%d len:%d, stretch:%d\n", |
| 617 | num, i, msgs[i].len, stretch); |
| 618 | geni_write_reg(msgs[i].len, |
| 619 | gi2c->base, SE_I2C_RX_TRANS_LEN); |
| 620 | m_cmd = I2C_READ; |
| 621 | geni_setup_m_cmd(gi2c->base, m_cmd, m_param); |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 622 | if (mode == SE_DMA) { |
| 623 | ret = geni_se_rx_dma_prep(gi2c->wrapper_dev, |
| 624 | gi2c->base, msgs[i].buf, |
| 625 | msgs[i].len, &rx_dma); |
Sagar Dharia | 1bfc8d1 | 2017-06-29 17:50:18 -0600 | [diff] [blame] | 626 | if (ret) { |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 627 | mode = FIFO_MODE; |
Sagar Dharia | 1bfc8d1 | 2017-06-29 17:50:18 -0600 | [diff] [blame] | 628 | ret = geni_se_select_mode(gi2c->base, |
| 629 | mode); |
| 630 | } |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 631 | } |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 632 | } else { |
| 633 | dev_dbg(gi2c->dev, |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 634 | "WRITE:n:%d,i:%d len:%d, stretch:%d, m_param:0x%x\n", |
| 635 | num, i, msgs[i].len, stretch, m_param); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 636 | geni_write_reg(msgs[i].len, gi2c->base, |
| 637 | SE_I2C_TX_TRANS_LEN); |
| 638 | m_cmd = I2C_WRITE; |
| 639 | geni_setup_m_cmd(gi2c->base, m_cmd, m_param); |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 640 | if (mode == SE_DMA) { |
| 641 | ret = geni_se_tx_dma_prep(gi2c->wrapper_dev, |
| 642 | gi2c->base, msgs[i].buf, |
| 643 | msgs[i].len, &tx_dma); |
Sagar Dharia | 1bfc8d1 | 2017-06-29 17:50:18 -0600 | [diff] [blame] | 644 | if (ret) { |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 645 | mode = FIFO_MODE; |
Sagar Dharia | 1bfc8d1 | 2017-06-29 17:50:18 -0600 | [diff] [blame] | 646 | ret = geni_se_select_mode(gi2c->base, |
| 647 | mode); |
| 648 | } |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 649 | } |
Sagar Dharia | 1bfc8d1 | 2017-06-29 17:50:18 -0600 | [diff] [blame] | 650 | if (mode == FIFO_MODE) /* Get FIFO IRQ */ |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 651 | geni_write_reg(1, gi2c->base, |
| 652 | SE_GENI_TX_WATERMARK_REG); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 653 | } |
| 654 | /* Ensure FIFO write go through before waiting for Done evet */ |
| 655 | mb(); |
| 656 | timeout = wait_for_completion_timeout(&gi2c->xfer, HZ); |
| 657 | if (!timeout) { |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 658 | geni_i2c_err(gi2c, GENI_TIMEOUT); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 659 | gi2c->cur = NULL; |
| 660 | geni_abort_m_cmd(gi2c->base); |
| 661 | timeout = wait_for_completion_timeout(&gi2c->xfer, HZ); |
| 662 | } |
| 663 | gi2c->cur_wr = 0; |
| 664 | gi2c->cur_rd = 0; |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 665 | if (mode == SE_DMA) { |
| 666 | if (gi2c->err) { |
| 667 | if (msgs[i].flags != I2C_M_RD) |
| 668 | writel_relaxed(1, gi2c->base + |
| 669 | SE_DMA_TX_FSM_RST); |
| 670 | else |
| 671 | writel_relaxed(1, gi2c->base + |
| 672 | SE_DMA_RX_FSM_RST); |
| 673 | wait_for_completion_timeout(&gi2c->xfer, HZ); |
| 674 | } |
| 675 | geni_se_rx_dma_unprep(gi2c->wrapper_dev, rx_dma, |
| 676 | msgs[i].len); |
| 677 | geni_se_tx_dma_unprep(gi2c->wrapper_dev, tx_dma, |
| 678 | msgs[i].len); |
| 679 | } |
| 680 | ret = gi2c->err; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 681 | if (gi2c->err) { |
| 682 | dev_err(gi2c->dev, "i2c error :%d\n", gi2c->err); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 683 | break; |
| 684 | } |
| 685 | } |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 686 | geni_i2c_txn_ret: |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 687 | if (ret == 0) |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 688 | ret = num; |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 689 | pm_runtime_put_sync(gi2c->dev); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 690 | gi2c->cur = NULL; |
| 691 | gi2c->err = 0; |
| 692 | dev_dbg(gi2c->dev, "i2c txn ret:%d\n", ret); |
| 693 | return ret; |
| 694 | } |
| 695 | |
| 696 | static u32 geni_i2c_func(struct i2c_adapter *adap) |
| 697 | { |
| 698 | return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK); |
| 699 | } |
| 700 | |
| 701 | static const struct i2c_algorithm geni_i2c_algo = { |
| 702 | .master_xfer = geni_i2c_xfer, |
| 703 | .functionality = geni_i2c_func, |
| 704 | }; |
| 705 | |
| 706 | static int geni_i2c_probe(struct platform_device *pdev) |
| 707 | { |
| 708 | struct geni_i2c_dev *gi2c; |
| 709 | struct resource *res; |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 710 | struct platform_device *wrapper_pdev; |
| 711 | struct device_node *wrapper_ph_node; |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 712 | int ret; |
| 713 | |
| 714 | gi2c = devm_kzalloc(&pdev->dev, sizeof(*gi2c), GFP_KERNEL); |
| 715 | if (!gi2c) |
| 716 | return -ENOMEM; |
| 717 | |
| 718 | gi2c->dev = &pdev->dev; |
| 719 | |
| 720 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 721 | if (!res) |
| 722 | return -EINVAL; |
| 723 | |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 724 | wrapper_ph_node = of_parse_phandle(pdev->dev.of_node, |
| 725 | "qcom,wrapper-core", 0); |
| 726 | if (IS_ERR_OR_NULL(wrapper_ph_node)) { |
| 727 | ret = PTR_ERR(wrapper_ph_node); |
| 728 | dev_err(&pdev->dev, "No wrapper core defined\n"); |
| 729 | return ret; |
| 730 | } |
| 731 | wrapper_pdev = of_find_device_by_node(wrapper_ph_node); |
| 732 | of_node_put(wrapper_ph_node); |
| 733 | if (IS_ERR_OR_NULL(wrapper_pdev)) { |
| 734 | ret = PTR_ERR(wrapper_pdev); |
| 735 | dev_err(&pdev->dev, "Cannot retrieve wrapper device\n"); |
| 736 | return ret; |
| 737 | } |
| 738 | gi2c->wrapper_dev = &wrapper_pdev->dev; |
| 739 | gi2c->i2c_rsc.wrapper_dev = &wrapper_pdev->dev; |
| 740 | ret = geni_se_resources_init(&gi2c->i2c_rsc, I2C_CORE2X_VOTE, |
| 741 | (DEFAULT_SE_CLK * DEFAULT_BUS_WIDTH)); |
| 742 | if (ret) { |
| 743 | dev_err(gi2c->dev, "geni_se_resources_init\n"); |
| 744 | return ret; |
| 745 | } |
| 746 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 747 | gi2c->i2c_rsc.se_clk = devm_clk_get(&pdev->dev, "se-clk"); |
| 748 | if (IS_ERR(gi2c->i2c_rsc.se_clk)) { |
| 749 | ret = PTR_ERR(gi2c->i2c_rsc.se_clk); |
| 750 | dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret); |
| 751 | return ret; |
| 752 | } |
| 753 | |
| 754 | gi2c->i2c_rsc.m_ahb_clk = devm_clk_get(&pdev->dev, "m-ahb"); |
| 755 | if (IS_ERR(gi2c->i2c_rsc.m_ahb_clk)) { |
| 756 | ret = PTR_ERR(gi2c->i2c_rsc.m_ahb_clk); |
| 757 | dev_err(&pdev->dev, "Err getting M AHB clk %d\n", ret); |
| 758 | return ret; |
| 759 | } |
| 760 | |
| 761 | gi2c->i2c_rsc.s_ahb_clk = devm_clk_get(&pdev->dev, "s-ahb"); |
| 762 | if (IS_ERR(gi2c->i2c_rsc.s_ahb_clk)) { |
| 763 | ret = PTR_ERR(gi2c->i2c_rsc.s_ahb_clk); |
| 764 | dev_err(&pdev->dev, "Err getting S AHB clk %d\n", ret); |
| 765 | return ret; |
| 766 | } |
| 767 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 768 | gi2c->base = devm_ioremap_resource(gi2c->dev, res); |
| 769 | if (IS_ERR(gi2c->base)) |
| 770 | return PTR_ERR(gi2c->base); |
| 771 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 772 | gi2c->i2c_rsc.geni_pinctrl = devm_pinctrl_get(&pdev->dev); |
| 773 | if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_pinctrl)) { |
| 774 | dev_err(&pdev->dev, "No pinctrl config specified\n"); |
| 775 | ret = PTR_ERR(gi2c->i2c_rsc.geni_pinctrl); |
| 776 | return ret; |
| 777 | } |
| 778 | gi2c->i2c_rsc.geni_gpio_active = |
| 779 | pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl, |
| 780 | PINCTRL_DEFAULT); |
| 781 | if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_active)) { |
| 782 | dev_err(&pdev->dev, "No default config specified\n"); |
| 783 | ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_active); |
| 784 | return ret; |
| 785 | } |
| 786 | gi2c->i2c_rsc.geni_gpio_sleep = |
| 787 | pinctrl_lookup_state(gi2c->i2c_rsc.geni_pinctrl, |
| 788 | PINCTRL_SLEEP); |
| 789 | if (IS_ERR_OR_NULL(gi2c->i2c_rsc.geni_gpio_sleep)) { |
| 790 | dev_err(&pdev->dev, "No sleep config specified\n"); |
| 791 | ret = PTR_ERR(gi2c->i2c_rsc.geni_gpio_sleep); |
| 792 | return ret; |
| 793 | } |
| 794 | |
Shrey Vijay | 6f23120 | 2017-07-11 11:16:16 +0530 | [diff] [blame] | 795 | if (of_property_read_u32(pdev->dev.of_node, "qcom,clk-freq-out", |
| 796 | &gi2c->i2c_rsc.clk_freq_out)) { |
| 797 | dev_info(&pdev->dev, |
| 798 | "Bus frequency not specified, default to 400KHz.\n"); |
| 799 | gi2c->i2c_rsc.clk_freq_out = KHz(400); |
| 800 | } |
| 801 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 802 | gi2c->irq = platform_get_irq(pdev, 0); |
| 803 | if (gi2c->irq < 0) { |
| 804 | dev_err(gi2c->dev, "IRQ error for i2c-geni\n"); |
| 805 | return gi2c->irq; |
| 806 | } |
| 807 | |
Shrey Vijay | 6f23120 | 2017-07-11 11:16:16 +0530 | [diff] [blame] | 808 | ret = geni_i2c_clk_map_idx(gi2c); |
| 809 | if (ret) { |
| 810 | dev_err(gi2c->dev, "Invalid clk frequency %d KHz: %d\n", |
| 811 | gi2c->i2c_rsc.clk_freq_out, ret); |
| 812 | return ret; |
| 813 | } |
| 814 | |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 815 | gi2c->adap.algo = &geni_i2c_algo; |
| 816 | init_completion(&gi2c->xfer); |
| 817 | platform_set_drvdata(pdev, gi2c); |
| 818 | ret = devm_request_irq(gi2c->dev, gi2c->irq, geni_i2c_irq, |
| 819 | IRQF_TRIGGER_HIGH, "i2c_geni", gi2c); |
| 820 | if (ret) { |
| 821 | dev_err(gi2c->dev, "Request_irq failed:%d: err:%d\n", |
| 822 | gi2c->irq, ret); |
| 823 | return ret; |
| 824 | } |
| 825 | disable_irq(gi2c->irq); |
| 826 | i2c_set_adapdata(&gi2c->adap, gi2c); |
| 827 | gi2c->adap.dev.parent = gi2c->dev; |
| 828 | gi2c->adap.dev.of_node = pdev->dev.of_node; |
| 829 | |
| 830 | strlcpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name)); |
| 831 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 832 | pm_runtime_set_suspended(gi2c->dev); |
| 833 | pm_runtime_enable(gi2c->dev); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 834 | i2c_add_adapter(&gi2c->adap); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 835 | |
Karthikeyan Ramasubramanian | a576657 | 2017-04-19 11:31:42 -0600 | [diff] [blame] | 836 | dev_dbg(gi2c->dev, "I2C probed\n"); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | static int geni_i2c_remove(struct platform_device *pdev) |
| 841 | { |
| 842 | struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev); |
| 843 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 844 | pm_runtime_disable(gi2c->dev); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 845 | i2c_del_adapter(&gi2c->adap); |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 846 | if (gi2c->ipcl) |
| 847 | ipc_log_context_destroy(gi2c->ipcl); |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 848 | return 0; |
| 849 | } |
| 850 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 851 | static int geni_i2c_resume_noirq(struct device *device) |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 852 | { |
| 853 | return 0; |
| 854 | } |
| 855 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 856 | #ifdef CONFIG_PM |
| 857 | static int geni_i2c_runtime_suspend(struct device *dev) |
| 858 | { |
| 859 | struct geni_i2c_dev *gi2c = dev_get_drvdata(dev); |
| 860 | |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 861 | if (gi2c->se_mode == FIFO_SE_DMA) |
| 862 | disable_irq(gi2c->irq); |
| 863 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 864 | se_geni_resources_off(&gi2c->i2c_rsc); |
| 865 | return 0; |
| 866 | } |
| 867 | |
| 868 | static int geni_i2c_runtime_resume(struct device *dev) |
| 869 | { |
| 870 | int ret; |
| 871 | struct geni_i2c_dev *gi2c = dev_get_drvdata(dev); |
| 872 | |
Sagar Dharia | 818623c | 2017-04-27 13:13:29 -0600 | [diff] [blame] | 873 | if (!gi2c->ipcl) { |
| 874 | char ipc_name[I2C_NAME_SIZE]; |
| 875 | |
| 876 | snprintf(ipc_name, I2C_NAME_SIZE, "i2c-%d", gi2c->adap.nr); |
| 877 | gi2c->ipcl = ipc_log_context_create(2, ipc_name, 0); |
| 878 | } |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 879 | ret = se_geni_resources_on(&gi2c->i2c_rsc); |
| 880 | if (ret) |
| 881 | return ret; |
| 882 | |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 883 | if (gi2c->se_mode == UNINITIALIZED) { |
Girish Mahadevan | af5f2bc | 2017-08-15 12:05:40 -0600 | [diff] [blame] | 884 | u32 se_mode = readl_relaxed(gi2c->base + |
| 885 | GENI_IF_FIFO_DISABLE_RO); |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 886 | |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 887 | if (se_mode) { |
| 888 | gi2c->se_mode = GSI_ONLY; |
| 889 | geni_se_select_mode(gi2c->base, GSI_DMA); |
| 890 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, |
| 891 | "i2c in GSI ONLY mode\n"); |
| 892 | } else { |
| 893 | int gi2c_tx_depth = get_tx_fifo_depth(gi2c->base); |
| 894 | |
| 895 | gi2c->se_mode = FIFO_SE_DMA; |
| 896 | |
| 897 | gi2c->tx_wm = gi2c_tx_depth - 1; |
| 898 | geni_se_init(gi2c->base, gi2c->tx_wm, gi2c_tx_depth); |
| 899 | se_config_packing(gi2c->base, 8, 4, true); |
| 900 | GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev, |
| 901 | "i2c fifo/se-dma mode. fifo depth:%d\n", |
| 902 | gi2c_tx_depth); |
| 903 | } |
Karthikeyan Ramasubramanian | 0d578b7 | 2017-04-26 10:44:02 -0600 | [diff] [blame] | 904 | } |
Sagar Dharia | 673a450 | 2017-04-14 14:20:21 -0600 | [diff] [blame] | 905 | if (gi2c->se_mode == FIFO_SE_DMA) |
| 906 | enable_irq(gi2c->irq); |
| 907 | |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 908 | return 0; |
| 909 | } |
| 910 | |
| 911 | static int geni_i2c_suspend_noirq(struct device *device) |
| 912 | { |
Sagar Dharia | 9b8e1052 | 2017-09-28 22:59:56 -0600 | [diff] [blame] | 913 | struct geni_i2c_dev *gi2c = dev_get_drvdata(device); |
| 914 | int ret; |
| 915 | |
| 916 | /* Make sure no transactions are pending */ |
| 917 | ret = i2c_trylock_bus(&gi2c->adap, I2C_LOCK_SEGMENT); |
| 918 | if (!ret) { |
| 919 | GENI_SE_ERR(gi2c->ipcl, true, gi2c->dev, |
| 920 | "late I2C transaction request\n"); |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 921 | return -EBUSY; |
Sagar Dharia | 9b8e1052 | 2017-09-28 22:59:56 -0600 | [diff] [blame] | 922 | } |
| 923 | if (!pm_runtime_status_suspended(device)) { |
| 924 | geni_i2c_runtime_suspend(device); |
| 925 | pm_runtime_disable(device); |
| 926 | pm_runtime_set_suspended(device); |
| 927 | pm_runtime_enable(device); |
| 928 | } |
| 929 | i2c_unlock_bus(&gi2c->adap, I2C_LOCK_SEGMENT); |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 930 | return 0; |
| 931 | } |
| 932 | #else |
| 933 | static int geni_i2c_runtime_suspend(struct device *dev) |
| 934 | { |
| 935 | return 0; |
| 936 | } |
| 937 | |
| 938 | static int geni_i2c_runtime_resume(struct device *dev) |
| 939 | { |
| 940 | return 0; |
| 941 | } |
| 942 | |
| 943 | static int geni_i2c_suspend_noirq(struct device *device) |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 944 | { |
| 945 | return 0; |
| 946 | } |
| 947 | #endif |
| 948 | |
| 949 | static const struct dev_pm_ops geni_i2c_pm_ops = { |
Sagar Dharia | b44003b | 2017-03-10 15:34:26 -0700 | [diff] [blame] | 950 | .suspend_noirq = geni_i2c_suspend_noirq, |
| 951 | .resume_noirq = geni_i2c_resume_noirq, |
| 952 | .runtime_suspend = geni_i2c_runtime_suspend, |
| 953 | .runtime_resume = geni_i2c_runtime_resume, |
Sagar Dharia | 7c927c0 | 2016-11-23 11:51:43 -0700 | [diff] [blame] | 954 | }; |
| 955 | |
| 956 | static const struct of_device_id geni_i2c_dt_match[] = { |
| 957 | { .compatible = "qcom,i2c-geni" }, |
| 958 | {} |
| 959 | }; |
| 960 | MODULE_DEVICE_TABLE(of, geni_i2c_dt_match); |
| 961 | |
| 962 | static struct platform_driver geni_i2c_driver = { |
| 963 | .probe = geni_i2c_probe, |
| 964 | .remove = geni_i2c_remove, |
| 965 | .driver = { |
| 966 | .name = "i2c_geni", |
| 967 | .pm = &geni_i2c_pm_ops, |
| 968 | .of_match_table = geni_i2c_dt_match, |
| 969 | }, |
| 970 | }; |
| 971 | |
| 972 | module_platform_driver(geni_i2c_driver); |
| 973 | |
| 974 | MODULE_LICENSE("GPL v2"); |
| 975 | MODULE_ALIAS("platform:i2c_geni"); |