Lines Matching +full:slave +full:- +full:dev
1 // SPDX-License-Identifier: GPL-2.0
3 * Synopsys DesignWare I2C adapter driver (slave only).
19 #include "i2c-designware-core.h"
21 static void i2c_dw_configure_fifo_slave(struct dw_i2c_dev *dev) in i2c_dw_configure_fifo_slave() argument
24 regmap_write(dev->map, DW_IC_TX_TL, 0); in i2c_dw_configure_fifo_slave()
25 regmap_write(dev->map, DW_IC_RX_TL, 0); in i2c_dw_configure_fifo_slave()
27 /* Configure the I2C slave. */ in i2c_dw_configure_fifo_slave()
28 regmap_write(dev->map, DW_IC_CON, dev->slave_cfg); in i2c_dw_configure_fifo_slave()
29 regmap_write(dev->map, DW_IC_INTR_MASK, DW_IC_INTR_SLAVE_MASK); in i2c_dw_configure_fifo_slave()
33 * i2c_dw_init_slave() - Initialize the designware i2c slave hardware
34 * @dev: device private data
36 * This function configures and enables the I2C in slave mode.
40 static int i2c_dw_init_slave(struct dw_i2c_dev *dev) in i2c_dw_init_slave() argument
44 ret = i2c_dw_acquire_lock(dev); in i2c_dw_init_slave()
49 __i2c_dw_disable(dev); in i2c_dw_init_slave()
52 if (dev->sda_hold_time) in i2c_dw_init_slave()
53 regmap_write(dev->map, DW_IC_SDA_HOLD, dev->sda_hold_time); in i2c_dw_init_slave()
55 i2c_dw_configure_fifo_slave(dev); in i2c_dw_init_slave()
56 i2c_dw_release_lock(dev); in i2c_dw_init_slave()
61 static int i2c_dw_reg_slave(struct i2c_client *slave) in i2c_dw_reg_slave() argument
63 struct dw_i2c_dev *dev = i2c_get_adapdata(slave->adapter); in i2c_dw_reg_slave() local
65 if (dev->slave) in i2c_dw_reg_slave()
66 return -EBUSY; in i2c_dw_reg_slave()
67 if (slave->flags & I2C_CLIENT_TEN) in i2c_dw_reg_slave()
68 return -EAFNOSUPPORT; in i2c_dw_reg_slave()
69 pm_runtime_get_sync(dev->dev); in i2c_dw_reg_slave()
72 * Set slave address in the IC_SAR register, in i2c_dw_reg_slave()
75 __i2c_dw_disable_nowait(dev); in i2c_dw_reg_slave()
76 regmap_write(dev->map, DW_IC_SAR, slave->addr); in i2c_dw_reg_slave()
77 dev->slave = slave; in i2c_dw_reg_slave()
79 __i2c_dw_enable(dev); in i2c_dw_reg_slave()
81 dev->status = 0; in i2c_dw_reg_slave()
86 static int i2c_dw_unreg_slave(struct i2c_client *slave) in i2c_dw_unreg_slave() argument
88 struct dw_i2c_dev *dev = i2c_get_adapdata(slave->adapter); in i2c_dw_unreg_slave() local
90 regmap_write(dev->map, DW_IC_INTR_MASK, 0); in i2c_dw_unreg_slave()
91 i2c_dw_disable(dev); in i2c_dw_unreg_slave()
92 synchronize_irq(dev->irq); in i2c_dw_unreg_slave()
93 dev->slave = NULL; in i2c_dw_unreg_slave()
94 pm_runtime_put(dev->dev); in i2c_dw_unreg_slave()
99 static u32 i2c_dw_read_clear_intrbits_slave(struct dw_i2c_dev *dev) in i2c_dw_read_clear_intrbits_slave() argument
115 regmap_read(dev->map, DW_IC_INTR_STAT, &stat); in i2c_dw_read_clear_intrbits_slave()
122 * Instead, use the separately-prepared IC_CLR_* registers. in i2c_dw_read_clear_intrbits_slave()
125 regmap_read(dev->map, DW_IC_CLR_TX_ABRT, &dummy); in i2c_dw_read_clear_intrbits_slave()
127 regmap_read(dev->map, DW_IC_CLR_RX_UNDER, &dummy); in i2c_dw_read_clear_intrbits_slave()
129 regmap_read(dev->map, DW_IC_CLR_RX_OVER, &dummy); in i2c_dw_read_clear_intrbits_slave()
131 regmap_read(dev->map, DW_IC_CLR_TX_OVER, &dummy); in i2c_dw_read_clear_intrbits_slave()
133 regmap_read(dev->map, DW_IC_CLR_RX_DONE, &dummy); in i2c_dw_read_clear_intrbits_slave()
135 regmap_read(dev->map, DW_IC_CLR_ACTIVITY, &dummy); in i2c_dw_read_clear_intrbits_slave()
137 regmap_read(dev->map, DW_IC_CLR_STOP_DET, &dummy); in i2c_dw_read_clear_intrbits_slave()
139 regmap_read(dev->map, DW_IC_CLR_START_DET, &dummy); in i2c_dw_read_clear_intrbits_slave()
141 regmap_read(dev->map, DW_IC_CLR_GEN_CALL, &dummy); in i2c_dw_read_clear_intrbits_slave()
147 * Interrupt service routine. This gets called whenever an I2C slave interrupt
152 struct dw_i2c_dev *dev = dev_id; in i2c_dw_isr_slave() local
156 regmap_read(dev->map, DW_IC_ENABLE, &enabled); in i2c_dw_isr_slave()
157 regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &raw_stat); in i2c_dw_isr_slave()
158 regmap_read(dev->map, DW_IC_STATUS, &tmp); in i2c_dw_isr_slave()
161 if (!enabled || !(raw_stat & ~DW_IC_INTR_ACTIVITY) || !dev->slave) in i2c_dw_isr_slave()
164 stat = i2c_dw_read_clear_intrbits_slave(dev); in i2c_dw_isr_slave()
165 dev_dbg(dev->dev, in i2c_dw_isr_slave()
170 if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) { in i2c_dw_isr_slave()
171 dev->status |= STATUS_WRITE_IN_PROGRESS; in i2c_dw_isr_slave()
172 dev->status &= ~STATUS_READ_IN_PROGRESS; in i2c_dw_isr_slave()
173 i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_REQUESTED, in i2c_dw_isr_slave()
178 regmap_read(dev->map, DW_IC_DATA_CMD, &tmp); in i2c_dw_isr_slave()
180 i2c_slave_event(dev->slave, in i2c_dw_isr_slave()
184 i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_RECEIVED, in i2c_dw_isr_slave()
186 regmap_read(dev->map, DW_IC_STATUS, &tmp); in i2c_dw_isr_slave()
192 regmap_read(dev->map, DW_IC_CLR_RD_REQ, &tmp); in i2c_dw_isr_slave()
194 if (!(dev->status & STATUS_READ_IN_PROGRESS)) { in i2c_dw_isr_slave()
195 i2c_slave_event(dev->slave, in i2c_dw_isr_slave()
198 dev->status |= STATUS_READ_IN_PROGRESS; in i2c_dw_isr_slave()
199 dev->status &= ~STATUS_WRITE_IN_PROGRESS; in i2c_dw_isr_slave()
201 i2c_slave_event(dev->slave, in i2c_dw_isr_slave()
205 regmap_write(dev->map, DW_IC_DATA_CMD, val); in i2c_dw_isr_slave()
210 i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val); in i2c_dw_isr_slave()
221 void i2c_dw_configure_slave(struct dw_i2c_dev *dev) in i2c_dw_configure_slave() argument
223 dev->functionality = I2C_FUNC_SLAVE; in i2c_dw_configure_slave()
225 dev->slave_cfg = DW_IC_CON_RX_FIFO_FULL_HLD_CTRL | in i2c_dw_configure_slave()
228 dev->mode = DW_IC_SLAVE; in i2c_dw_configure_slave()
232 int i2c_dw_probe_slave(struct dw_i2c_dev *dev) in i2c_dw_probe_slave() argument
234 struct i2c_adapter *adap = &dev->adapter; in i2c_dw_probe_slave()
237 dev->init = i2c_dw_init_slave; in i2c_dw_probe_slave()
239 ret = i2c_dw_init_regmap(dev); in i2c_dw_probe_slave()
243 ret = i2c_dw_set_sda_hold(dev); in i2c_dw_probe_slave()
247 ret = i2c_dw_set_fifo_size(dev); in i2c_dw_probe_slave()
251 ret = dev->init(dev); in i2c_dw_probe_slave()
255 snprintf(adap->name, sizeof(adap->name), in i2c_dw_probe_slave()
256 "Synopsys DesignWare I2C Slave adapter"); in i2c_dw_probe_slave()
257 adap->retries = 3; in i2c_dw_probe_slave()
258 adap->algo = &i2c_dw_algo; in i2c_dw_probe_slave()
259 adap->dev.parent = dev->dev; in i2c_dw_probe_slave()
260 i2c_set_adapdata(adap, dev); in i2c_dw_probe_slave()
262 ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr_slave, in i2c_dw_probe_slave()
263 IRQF_SHARED, dev_name(dev->dev), dev); in i2c_dw_probe_slave()
265 dev_err(dev->dev, "failure requesting irq %i: %d\n", in i2c_dw_probe_slave()
266 dev->irq, ret); in i2c_dw_probe_slave()
272 dev_err(dev->dev, "failure adding adapter: %d\n", ret); in i2c_dw_probe_slave()
279 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus slave adapter");