1 // SPDX-License-Identifier: GPL-2.0+
6 #include <linux/fsi-occ.h>
18 /* OCB (on-chip control bridge - interface to OCC) registers */
23 /* OCC SRAM address space */
36 static int p8_i2c_occ_getscom(struct i2c_client *client, u32 address, u8 *data)  in p8_i2c_occ_getscom()  argument
43 	address <<= 1;  in p8_i2c_occ_getscom()
45 	msgs[0].addr = client->addr;  in p8_i2c_occ_getscom()
46 	msgs[0].flags = client->flags & I2C_M_TEN;  in p8_i2c_occ_getscom()
48 	/* address is a scom address; bus-endian */  in p8_i2c_occ_getscom()
49 	msgs[0].buf = (char *)&address;  in p8_i2c_occ_getscom()
51 	/* data from OCC is big-endian */  in p8_i2c_occ_getscom()
52 	msgs[1].addr = client->addr;  in p8_i2c_occ_getscom()
53 	msgs[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;  in p8_i2c_occ_getscom()
57 	rc = i2c_transfer(client->adapter, msgs, 2);  in p8_i2c_occ_getscom()
61 	*(u64 *)data = be64_to_cpu(buf);  in p8_i2c_occ_getscom()
66 static int p8_i2c_occ_putscom(struct i2c_client *client, u32 address, u8 *data)  in p8_i2c_occ_putscom()  argument
72 	address <<= 1;  in p8_i2c_occ_putscom()
74 	/* address is bus-endian; data passed through from user as-is */  in p8_i2c_occ_putscom()
75 	buf[0] = address;  in p8_i2c_occ_putscom()
76 	memcpy(&buf[1], &data[4], sizeof(u32));  in p8_i2c_occ_putscom()
77 	memcpy(&buf[2], data, sizeof(u32));  in p8_i2c_occ_putscom()
83 		return -EIO;  in p8_i2c_occ_putscom()
88 static int p8_i2c_occ_putscom_u32(struct i2c_client *client, u32 address,  in p8_i2c_occ_putscom_u32()  argument
96 	return p8_i2c_occ_putscom(client, address, buf);  in p8_i2c_occ_putscom_u32()
99 static int p8_i2c_occ_putscom_be(struct i2c_client *client, u32 address,  in p8_i2c_occ_putscom_be()  argument
100 				 u8 *data, size_t len)  in p8_i2c_occ_putscom_be()  argument
104 	memcpy(&data0, data, min_t(size_t, len, 4));  in p8_i2c_occ_putscom_be()
106 		len -= 4;  in p8_i2c_occ_putscom_be()
107 		memcpy(&data1, data + 4, min_t(size_t, len, 4));  in p8_i2c_occ_putscom_be()
110 	return p8_i2c_occ_putscom_u32(client, address, be32_to_cpu(data0),  in p8_i2c_occ_putscom_be()
123 	struct i2c_client *client = ctx->client;  in p8_i2c_occ_send_cmd()
128 	/* set sram address for command */  in p8_i2c_occ_send_cmd()
133 	/* write command (expected to already be BE), we need bus-endian... */  in p8_i2c_occ_send_cmd()
144 		/* set sram address for response */  in p8_i2c_occ_send_cmd()
155 		if (or->return_status == OCC_RESP_CMD_IN_PRG) {  in p8_i2c_occ_send_cmd()
156 			rc = -EALREADY;  in p8_i2c_occ_send_cmd()
167 	switch (or->return_status) {  in p8_i2c_occ_send_cmd()
169 		rc = -ETIMEDOUT;  in p8_i2c_occ_send_cmd()
178 		rc = -EINVAL;  in p8_i2c_occ_send_cmd()
187 		rc = -EREMOTEIO;  in p8_i2c_occ_send_cmd()
190 		rc = -EPROTO;  in p8_i2c_occ_send_cmd()
196 	data_length = get_unaligned_be16(&or->data_length);  in p8_i2c_occ_send_cmd()
198 		return -EMSGSIZE;  in p8_i2c_occ_send_cmd()
200 	/* fetch the rest of the response data */  in p8_i2c_occ_send_cmd()
213 	struct p8_i2c_occ *ctx = devm_kzalloc(&client->dev, sizeof(*ctx),  in p8_i2c_occ_probe()
216 		return -ENOMEM;  in p8_i2c_occ_probe()
218 	ctx->client = client;  in p8_i2c_occ_probe()
219 	occ = &ctx->occ;  in p8_i2c_occ_probe()
220 	occ->bus_dev = &client->dev;  in p8_i2c_occ_probe()
221 	dev_set_drvdata(&client->dev, occ);  in p8_i2c_occ_probe()
223 	occ->powr_sample_time_us = 250;  in p8_i2c_occ_probe()
224 	occ->poll_cmd_data = 0x10;		/* P8 OCC poll data */  in p8_i2c_occ_probe()
225 	occ->send_cmd = p8_i2c_occ_send_cmd;  in p8_i2c_occ_probe()
232 	struct occ *occ = dev_get_drvdata(&client->dev);  in p8_i2c_occ_remove()
238 	{ .compatible = "ibm,p8-occ-hwmon" },
245 		.name = "occ-hwmon",