1 // SPDX-License-Identifier: GPL-2.0-only
8  * Christophe Ricard <christophe-h.ricard@st.com>
10  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
46  * [1] https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
48 static int tpm_tis_spi_flow_control(struct tpm_tis_spi_phy *phy,  in tpm_tis_spi_flow_control()  argument
51 	struct spi_message m;  in tpm_tis_spi_flow_control()  local
54 	if ((phy->iobuf[3] & 0x01) == 0) {  in tpm_tis_spi_flow_control()
57 			spi_xfer->len = 1;  in tpm_tis_spi_flow_control()
58 			spi_message_init(&m);  in tpm_tis_spi_flow_control()
59 			spi_message_add_tail(spi_xfer, &m);  in tpm_tis_spi_flow_control()
60 			ret = spi_sync_locked(phy->spi_device, &m);  in tpm_tis_spi_flow_control()
63 			if (phy->iobuf[0] & 0x01)  in tpm_tis_spi_flow_control()
68 			return -ETIMEDOUT;  in tpm_tis_spi_flow_control()
77 	struct tpm_tis_spi_phy *phy = to_tpm_tis_spi_phy(data);  in tpm_tis_spi_transfer()  local
79 	struct spi_message m;  in tpm_tis_spi_transfer()  local
83 	spi_bus_lock(phy->spi_device->master);  in tpm_tis_spi_transfer()
88 		phy->iobuf[0] = (in ? 0x80 : 0) | (transfer_len - 1);  in tpm_tis_spi_transfer()
89 		phy->iobuf[1] = 0xd4;  in tpm_tis_spi_transfer()
90 		phy->iobuf[2] = addr >> 8;  in tpm_tis_spi_transfer()
91 		phy->iobuf[3] = addr;  in tpm_tis_spi_transfer()
94 		spi_xfer.tx_buf = phy->iobuf;  in tpm_tis_spi_transfer()
95 		spi_xfer.rx_buf = phy->iobuf;  in tpm_tis_spi_transfer()
99 		spi_message_init(&m);  in tpm_tis_spi_transfer()
100 		spi_message_add_tail(&spi_xfer, &m);  in tpm_tis_spi_transfer()
101 		ret = spi_sync_locked(phy->spi_device, &m);  in tpm_tis_spi_transfer()
107 		ret = phy->flow_control(phy, &spi_xfer);  in tpm_tis_spi_transfer()
117 			spi_xfer.tx_buf = phy->iobuf;  in tpm_tis_spi_transfer()
119 			memcpy(phy->iobuf, out, transfer_len);  in tpm_tis_spi_transfer()
123 		spi_message_init(&m);  in tpm_tis_spi_transfer()
124 		spi_message_add_tail(&spi_xfer, &m);  in tpm_tis_spi_transfer()
125 		reinit_completion(&phy->ready);  in tpm_tis_spi_transfer()
126 		ret = spi_sync_locked(phy->spi_device, &m);  in tpm_tis_spi_transfer()
131 			memcpy(in, phy->iobuf, transfer_len);  in tpm_tis_spi_transfer()
135 		len -= transfer_len;  in tpm_tis_spi_transfer()
139 	spi_bus_unlock(phy->spi_device->master);  in tpm_tis_spi_transfer()
160 	rc = data->phy_ops->read_bytes(data, addr, sizeof(u16),  in tpm_tis_spi_read16()
173 	rc = data->phy_ops->read_bytes(data, addr, sizeof(u32),  in tpm_tis_spi_read32()
187 	rc = data->phy_ops->write_bytes(data, addr, sizeof(u32),  in tpm_tis_spi_write32()
193 int tpm_tis_spi_init(struct spi_device *spi, struct tpm_tis_spi_phy *phy,  in tpm_tis_spi_init()  argument
196 	phy->iobuf = devm_kmalloc(&spi->dev, MAX_SPI_FRAMESIZE, GFP_KERNEL);  in tpm_tis_spi_init()
197 	if (!phy->iobuf)  in tpm_tis_spi_init()
198 		return -ENOMEM;  in tpm_tis_spi_init()
200 	phy->spi_device = spi;  in tpm_tis_spi_init()
202 	return tpm_tis_core_init(&spi->dev, &phy->priv, irq, phy_ops, NULL);  in tpm_tis_spi_init()
215 	struct tpm_tis_spi_phy *phy;  in tpm_tis_spi_probe()  local
218 	phy = devm_kzalloc(&dev->dev, sizeof(struct tpm_tis_spi_phy),  in tpm_tis_spi_probe()
220 	if (!phy)  in tpm_tis_spi_probe()
221 		return -ENOMEM;  in tpm_tis_spi_probe()
223 	phy->flow_control = tpm_tis_spi_flow_control;  in tpm_tis_spi_probe()
226 	if (dev->irq > 0)  in tpm_tis_spi_probe()
227 		irq = dev->irq;  in tpm_tis_spi_probe()
229 		irq = -1;  in tpm_tis_spi_probe()
231 	init_completion(&phy->ready);  in tpm_tis_spi_probe()
232 	return tpm_tis_spi_init(dev, phy, irq, &tpm_spi_phy_ops);  in tpm_tis_spi_probe()
242 	probe_func = of_device_get_match_data(&spi->dev);  in tpm_tis_spi_driver_probe()
244 		probe_func = (tpm_tis_spi_probe_func)spi_dev_id->driver_data;  in tpm_tis_spi_driver_probe()
246 		return -ENODEV;  in tpm_tis_spi_driver_probe()
270 	{ .compatible = "st,st33htpm-spi", .data = tpm_tis_spi_probe },
272 	{ .compatible = "tcg,tpm_tis-spi", .data = tpm_tis_spi_probe },