1 // SPDX-License-Identifier: GPL-2.0-only
8  * Christophe Ricard <christophe-h.ricard@st.com>
10  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
47  * [1] https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
49 static int tpm_tis_spi_flow_control(struct tpm_tis_spi_phy *phy,  in tpm_tis_spi_flow_control()  argument
52 	struct spi_message m;  in tpm_tis_spi_flow_control()  local
55 	if ((phy->iobuf[3] & 0x01) == 0) {  in tpm_tis_spi_flow_control()
58 			spi_xfer->len = 1;  in tpm_tis_spi_flow_control()
59 			spi_message_init(&m);  in tpm_tis_spi_flow_control()
60 			spi_message_add_tail(spi_xfer, &m);  in tpm_tis_spi_flow_control()
61 			ret = spi_sync_locked(phy->spi_device, &m);  in tpm_tis_spi_flow_control()
64 			if (phy->iobuf[0] & 0x01)  in tpm_tis_spi_flow_control()
69 			return -ETIMEDOUT;  in tpm_tis_spi_flow_control()
84 	struct tpm_tis_spi_phy *phy = to_tpm_tis_spi_phy(data);  in tpm_tis_spi_transfer_half()  local
86 	struct spi_message m;  in tpm_tis_spi_transfer_half()  local
93 		spi_message_init(&m);  in tpm_tis_spi_transfer_half()
94 		phy->iobuf[0] = (in ? 0x80 : 0) | (transfer_len - 1);  in tpm_tis_spi_transfer_half()
95 		phy->iobuf[1] = 0xd4;  in tpm_tis_spi_transfer_half()
96 		phy->iobuf[2] = addr >> 8;  in tpm_tis_spi_transfer_half()
97 		phy->iobuf[3] = addr;  in tpm_tis_spi_transfer_half()
101 		spi_xfer[0].tx_buf = phy->iobuf;  in tpm_tis_spi_transfer_half()
103 		spi_message_add_tail(&spi_xfer[0], &m);  in tpm_tis_spi_transfer_half()
105 		spi_xfer[1].tx_buf = phy->iobuf + 1;  in tpm_tis_spi_transfer_half()
107 		spi_message_add_tail(&spi_xfer[1], &m);  in tpm_tis_spi_transfer_half()
110 			spi_xfer[2].tx_buf = &phy->iobuf[4];  in tpm_tis_spi_transfer_half()
112 			memcpy(&phy->iobuf[4], out, transfer_len);  in tpm_tis_spi_transfer_half()
118 			spi_xfer[2].rx_buf = &phy->iobuf[4];  in tpm_tis_spi_transfer_half()
122 		spi_message_add_tail(&spi_xfer[2], &m);  in tpm_tis_spi_transfer_half()
124 		reinit_completion(&phy->ready);  in tpm_tis_spi_transfer_half()
126 		ret = spi_sync(phy->spi_device, &m);  in tpm_tis_spi_transfer_half()
131 			memcpy(in, &phy->iobuf[4], transfer_len);  in tpm_tis_spi_transfer_half()
135 		len -= transfer_len;  in tpm_tis_spi_transfer_half()
144 	struct tpm_tis_spi_phy *phy = to_tpm_tis_spi_phy(data);  in tpm_tis_spi_transfer_full()  local
146 	struct spi_message m;  in tpm_tis_spi_transfer_full()  local
150 	spi_bus_lock(phy->spi_device->controller);  in tpm_tis_spi_transfer_full()
155 		phy->iobuf[0] = (in ? 0x80 : 0) | (transfer_len - 1);  in tpm_tis_spi_transfer_full()
156 		phy->iobuf[1] = 0xd4;  in tpm_tis_spi_transfer_full()
157 		phy->iobuf[2] = addr >> 8;  in tpm_tis_spi_transfer_full()
158 		phy->iobuf[3] = addr;  in tpm_tis_spi_transfer_full()
161 		spi_xfer.tx_buf = phy->iobuf;  in tpm_tis_spi_transfer_full()
162 		spi_xfer.rx_buf = phy->iobuf;  in tpm_tis_spi_transfer_full()
166 		spi_message_init(&m);  in tpm_tis_spi_transfer_full()
167 		spi_message_add_tail(&spi_xfer, &m);  in tpm_tis_spi_transfer_full()
168 		ret = spi_sync_locked(phy->spi_device, &m);  in tpm_tis_spi_transfer_full()
174 		ret = phy->flow_control(phy, &spi_xfer);  in tpm_tis_spi_transfer_full()
184 			spi_xfer.tx_buf = phy->iobuf;  in tpm_tis_spi_transfer_full()
186 			memcpy(phy->iobuf, out, transfer_len);  in tpm_tis_spi_transfer_full()
190 		spi_message_init(&m);  in tpm_tis_spi_transfer_full()
191 		spi_message_add_tail(&spi_xfer, &m);  in tpm_tis_spi_transfer_full()
192 		reinit_completion(&phy->ready);  in tpm_tis_spi_transfer_full()
193 		ret = spi_sync_locked(phy->spi_device, &m);  in tpm_tis_spi_transfer_full()
198 			memcpy(in, phy->iobuf, transfer_len);  in tpm_tis_spi_transfer_full()
202 		len -= transfer_len;  in tpm_tis_spi_transfer_full()
209 		spi_message_init(&m);  in tpm_tis_spi_transfer_full()
210 		spi_message_add_tail(&spi_xfer, &m);  in tpm_tis_spi_transfer_full()
211 		spi_sync_locked(phy->spi_device, &m);  in tpm_tis_spi_transfer_full()
214 	spi_bus_unlock(phy->spi_device->controller);  in tpm_tis_spi_transfer_full()
221 	struct tpm_tis_spi_phy *phy = to_tpm_tis_spi_phy(data);  in tpm_tis_spi_transfer()  local
222 	struct spi_controller *ctlr = phy->spi_device->controller;  in tpm_tis_spi_transfer()
230 	if (ctlr->flags & SPI_CONTROLLER_HALF_DUPLEX)  in tpm_tis_spi_transfer()
248 int tpm_tis_spi_init(struct spi_device *spi, struct tpm_tis_spi_phy *phy,  in tpm_tis_spi_init()  argument
251 	phy->iobuf = devm_kmalloc(&spi->dev, SPI_HDRSIZE + MAX_SPI_FRAMESIZE, GFP_KERNEL);  in tpm_tis_spi_init()
252 	if (!phy->iobuf)  in tpm_tis_spi_init()
253 		return -ENOMEM;  in tpm_tis_spi_init()
255 	phy->spi_device = spi;  in tpm_tis_spi_init()
257 	return tpm_tis_core_init(&spi->dev, &phy->priv, irq, phy_ops, NULL);  in tpm_tis_spi_init()
267 	struct tpm_tis_spi_phy *phy;  in tpm_tis_spi_probe()  local
270 	phy = devm_kzalloc(&dev->dev, sizeof(struct tpm_tis_spi_phy),  in tpm_tis_spi_probe()
272 	if (!phy)  in tpm_tis_spi_probe()
273 		return -ENOMEM;  in tpm_tis_spi_probe()
275 	phy->flow_control = tpm_tis_spi_flow_control;  in tpm_tis_spi_probe()
277 	if (dev->controller->flags & SPI_CONTROLLER_HALF_DUPLEX)  in tpm_tis_spi_probe()
278 		dev->mode |= SPI_TPM_HW_FLOW;  in tpm_tis_spi_probe()
281 	if (dev->irq > 0)  in tpm_tis_spi_probe()
282 		irq = dev->irq;  in tpm_tis_spi_probe()
284 		irq = -1;  in tpm_tis_spi_probe()
286 	init_completion(&phy->ready);  in tpm_tis_spi_probe()
287 	return tpm_tis_spi_init(dev, phy, irq, &tpm_spi_phy_ops);  in tpm_tis_spi_probe()
297 	probe_func = of_device_get_match_data(&spi->dev);  in tpm_tis_spi_driver_probe()
300 			probe_func = (tpm_tis_spi_probe_func)spi_dev_id->driver_data;  in tpm_tis_spi_driver_probe()
302 				return -ENODEV;  in tpm_tis_spi_driver_probe()
322 	{ "st33htpm-spi", (unsigned long)tpm_tis_spi_probe },
325 	{ "tpm_tis-spi", (unsigned long)tpm_tis_spi_probe },
333 	{ .compatible = "st,st33htpm-spi", .data = tpm_tis_spi_probe },
335 	{ .compatible = "tcg,tpm_tis-spi", .data = tpm_tis_spi_probe },