1 // SPDX-License-Identifier: BSD-3-Clause
3  * Copyright (c) 2020, MIPI Alliance, Inc.
7  * I3C HCI v1.0/v1.1 Command Descriptor Handling
11 #include <linux/i3c/master.h>
13 #include "hci.h"
122 static enum hci_cmd_mode get_i3c_mode(struct i3c_hci *hci)  in get_i3c_mode()  argument
124 	struct i3c_bus *bus = i3c_master_get_bus(&hci->master);  in get_i3c_mode()
126 	if (bus->scl_rate.i3c >= 12500000)  in get_i3c_mode()
128 	if (bus->scl_rate.i3c > 8000000)  in get_i3c_mode()
130 	if (bus->scl_rate.i3c > 6000000)  in get_i3c_mode()
132 	if (bus->scl_rate.i3c > 4000000)  in get_i3c_mode()
134 	if (bus->scl_rate.i3c > 2000000)  in get_i3c_mode()
139 static enum hci_cmd_mode get_i2c_mode(struct i3c_hci *hci)  in get_i2c_mode()  argument
141 	struct i3c_bus *bus = i3c_master_get_bus(&hci->master);  in get_i2c_mode()
143 	if (bus->scl_rate.i2c >= 1000000)  in get_i2c_mode()
151 	xfer->cmd_desc[1] = 0;  in fill_data_bytes()
154 		xfer->cmd_desc[1] |= CMD_I1_DATA_BYTE_4(data[3]);  in fill_data_bytes()
157 		xfer->cmd_desc[1] |= CMD_I1_DATA_BYTE_3(data[2]);  in fill_data_bytes()
160 		xfer->cmd_desc[1] |= CMD_I1_DATA_BYTE_2(data[1]);  in fill_data_bytes()
163 		xfer->cmd_desc[1] |= CMD_I1_DATA_BYTE_1(data[0]);  in fill_data_bytes()
169 	xfer->data = NULL;  in fill_data_bytes()
172 static int hci_cmd_v1_prep_ccc(struct i3c_hci *hci,  in hci_cmd_v1_prep_ccc()  argument
177 	enum hci_cmd_mode mode = get_i3c_mode(hci);  in hci_cmd_v1_prep_ccc()
178 	u8 *data = xfer->data;  in hci_cmd_v1_prep_ccc()
179 	unsigned int data_len = xfer->data_len;  in hci_cmd_v1_prep_ccc()
180 	bool rnw = xfer->rnw;  in hci_cmd_v1_prep_ccc()
185 		return -EINVAL;  in hci_cmd_v1_prep_ccc()
188 		ret = mipi_i3c_hci_dat_v1.get_index(hci, ccc_addr);  in hci_cmd_v1_prep_ccc()
194 	xfer->cmd_tid = hci_get_tid();  in hci_cmd_v1_prep_ccc()
198 		xfer->cmd_desc[0] =  in hci_cmd_v1_prep_ccc()
200 			CMD_I0_TID(xfer->cmd_tid) |  in hci_cmd_v1_prep_ccc()
208 		xfer->cmd_desc[0] =  in hci_cmd_v1_prep_ccc()
210 			CMD_R0_TID(xfer->cmd_tid) |  in hci_cmd_v1_prep_ccc()
215 		xfer->cmd_desc[1] =  in hci_cmd_v1_prep_ccc()
222 static void hci_cmd_v1_prep_i3c_xfer(struct i3c_hci *hci,  in hci_cmd_v1_prep_i3c_xfer()  argument
227 	unsigned int dat_idx = dev_data->dat_idx;  in hci_cmd_v1_prep_i3c_xfer()
228 	enum hci_cmd_mode mode = get_i3c_mode(hci);  in hci_cmd_v1_prep_i3c_xfer()
229 	u8 *data = xfer->data;  in hci_cmd_v1_prep_i3c_xfer()
230 	unsigned int data_len = xfer->data_len;  in hci_cmd_v1_prep_i3c_xfer()
231 	bool rnw = xfer->rnw;  in hci_cmd_v1_prep_i3c_xfer()
233 	xfer->cmd_tid = hci_get_tid();  in hci_cmd_v1_prep_i3c_xfer()
237 		xfer->cmd_desc[0] =  in hci_cmd_v1_prep_i3c_xfer()
239 			CMD_I0_TID(xfer->cmd_tid) |  in hci_cmd_v1_prep_i3c_xfer()
246 		xfer->cmd_desc[0] =  in hci_cmd_v1_prep_i3c_xfer()
248 			CMD_R0_TID(xfer->cmd_tid) |  in hci_cmd_v1_prep_i3c_xfer()
252 		xfer->cmd_desc[1] =  in hci_cmd_v1_prep_i3c_xfer()
257 static void hci_cmd_v1_prep_i2c_xfer(struct i3c_hci *hci,  in hci_cmd_v1_prep_i2c_xfer()  argument
262 	unsigned int dat_idx = dev_data->dat_idx;  in hci_cmd_v1_prep_i2c_xfer()
263 	enum hci_cmd_mode mode = get_i2c_mode(hci);  in hci_cmd_v1_prep_i2c_xfer()
264 	u8 *data = xfer->data;  in hci_cmd_v1_prep_i2c_xfer()
265 	unsigned int data_len = xfer->data_len;  in hci_cmd_v1_prep_i2c_xfer()
266 	bool rnw = xfer->rnw;  in hci_cmd_v1_prep_i2c_xfer()
268 	xfer->cmd_tid = hci_get_tid();  in hci_cmd_v1_prep_i2c_xfer()
272 		xfer->cmd_desc[0] =  in hci_cmd_v1_prep_i2c_xfer()
274 			CMD_I0_TID(xfer->cmd_tid) |  in hci_cmd_v1_prep_i2c_xfer()
281 		xfer->cmd_desc[0] =  in hci_cmd_v1_prep_i2c_xfer()
283 			CMD_R0_TID(xfer->cmd_tid) |  in hci_cmd_v1_prep_i2c_xfer()
287 		xfer->cmd_desc[1] =  in hci_cmd_v1_prep_i2c_xfer()
292 static int hci_cmd_v1_daa(struct i3c_hci *hci)  in hci_cmd_v1_daa()  argument
295 	int ret, dat_idx = -1;  in hci_cmd_v1_daa()
303 		return -ENOMEM;  in hci_cmd_v1_daa()
313 		ret = mipi_i3c_hci_dat_v1.alloc_entry(hci);  in hci_cmd_v1_daa()
317 		ret = i3c_master_get_free_addr(&hci->master, next_addr);  in hci_cmd_v1_daa()
323 		mipi_i3c_hci_dat_v1.set_dynamic_addr(hci, dat_idx, next_addr);  in hci_cmd_v1_daa()
324 		mipi_i3c_hci_dct_index_reset(hci);  in hci_cmd_v1_daa()
326 		xfer->cmd_tid = hci_get_tid();  in hci_cmd_v1_daa()
327 		xfer->cmd_desc[0] =  in hci_cmd_v1_daa()
329 			CMD_A0_TID(xfer->cmd_tid) |  in hci_cmd_v1_daa()
334 		xfer->cmd_desc[1] = 0;  in hci_cmd_v1_daa()
335 		hci->io->queue_xfer(hci, xfer, 1);  in hci_cmd_v1_daa()
337 		    hci->io->dequeue_xfer(hci, xfer, 1)) {  in hci_cmd_v1_daa()
338 			ret = -ETIME;  in hci_cmd_v1_daa()
347 			ret = -EIO;  in hci_cmd_v1_daa()
351 		i3c_hci_dct_get_val(hci, 0, &pid, &dcr, &bcr);  in hci_cmd_v1_daa()
355 		mipi_i3c_hci_dat_v1.free_entry(hci, dat_idx);  in hci_cmd_v1_daa()
356 		dat_idx = -1;  in hci_cmd_v1_daa()
362 		ret = i3c_master_add_i3c_dev_locked(&hci->master, next_addr);  in hci_cmd_v1_daa()
368 		mipi_i3c_hci_dat_v1.free_entry(hci, dat_idx);  in hci_cmd_v1_daa()