1 // SPDX-License-Identifier: GPL-2.0+
18 #include <tpm-v1.h>
87 /* Retrieve burst count value out of the status register contents. */
98 	debug(PREFIX "Read reg 0x%4.4x returns 0x%2.2x\n",  in tpm_read_byte()
99 	      (u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, ret);  in tpm_read_byte()
106 	debug(PREFIX "Read reg 0x%4.4x returns 0x%8.8x\n",  in tpm_read_word()
107 	      (u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, ret);  in tpm_read_word()
114 	      (u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, value);  in tpm_write_byte()
122 	      (u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, value);  in tpm_write_word()
132  * @reg - pointer to the TPM register
133  * @mask - bitmask for the bitfield(s) to watch
134  * @expected - value the field(s) are supposed to be set to
137  * appropriate register bits, or -ETIMEDOUT on timeout.
149 		time_us--;  in tis_wait_reg()
152 	return -ETIMEDOUT;  in tis_wait_reg()
158  * Returns 0 on success, -ve on error
169 		return -EINVAL;  in tpm_tis_lpc_probe()
170 	priv->regs = map_sysmem(addr, 0);  in tpm_tis_lpc_probe()
171 	didvid = tpm_read_word(priv, &priv->regs[0].did_vid);  in tpm_tis_lpc_probe()
178 		return -ENODEV;  in tpm_tis_lpc_probe()
191  * @data - address of the data to send, byte by byte
192  * @len - length of the data to send
194  * Returns 0 on success, -ve on error (in case the device does not accept
200 	struct tpm_locality *regs = priv->regs;  in tis_senddata()
202 	u16 burst = 0;  in tis_senddata()  local
209 	if (value == -ETIMEDOUT) {  in tis_senddata()
210 		printf("%s:%d - failed to get 'command_ready' status\n",  in tis_senddata()
214 	burst = burst_count(value);  in tis_senddata()
220 		while (!burst) {  in tis_senddata()
223 				       __FILE__, __LINE__, len - offset, len);  in tis_senddata()
224 				return -ETIMEDOUT;  in tis_senddata()
227 			burst = burst_count(tpm_read_word(priv,  in tis_senddata()
238 		 * the -1 below) to make sure that the 'expected' status bit  in tis_senddata()
242 		count = min((size_t)burst, len - offset - 1);  in tis_senddata()
243 		while (count--)  in tis_senddata()
250 		if ((value == -ETIMEDOUT) || !(value & TIS_STS_EXPECT)) {  in tis_senddata()
253 			return value == -ETIMEDOUT ? value : -EIO;  in tis_senddata()
256 		burst = burst_count(value);  in tis_senddata()
257 		if ((offset == (len - 1)) && burst) {  in tis_senddata()
260 			 * device, so burst size must be nonzero before we  in tis_senddata()
275 	if ((value == -ETIMEDOUT) || (value & TIS_STS_EXPECT)) {  in tis_senddata()
278 		return value == -ETIMEDOUT ? value : -EIO;  in tis_senddata()
289  * read the TPM device response after a command was issued.
291  * @buffer - address where to read the response, byte by byte.
292  * @len - pointer to the size of buffer
296  * -ve value.
301 	struct tpm_locality *regs = priv->regs;  in tis_readresponse()
302 	u16 burst;  in tis_readresponse()  local
313 	if (value == -ETIMEDOUT) {  in tis_readresponse()
320 		while ((burst = burst_count(value)) == 0) {  in tis_readresponse()
322 				printf("%s:%d TPM stuck on read\n",  in tis_readresponse()
324 				return -EIO;  in tis_readresponse()
332 		while (burst-- && (offset < expected_count)) {  in tis_readresponse()
340 				 * total - it is stored as a 4 byte number in  in tis_readresponse()
355 					return -ENOSPC;  in tis_readresponse()
363 		if (value == -ETIMEDOUT) {  in tis_readresponse()
364 			printf("%s:%d failed to read response\n",  in tis_readresponse()
375 	 * Make sure we indeed read all there was. The TIS_STS_VALID bit is  in tis_readresponse()
381 		return -EBADMSG;  in tis_readresponse()
394 	struct tpm_locality *regs = priv->regs;  in tpm_tis_lpc_close()
403 				 TIS_ACCESS_ACTIVE_LOCALITY, 0) == -ETIMEDOUT) {  in tpm_tis_lpc_close()
404 			printf("%s:%d - failed to release locality %d\n",  in tpm_tis_lpc_close()
406 			return -ETIMEDOUT;  in tpm_tis_lpc_close()
415 	struct tpm_locality *regs = priv->regs;  in tpm_tis_lpc_open()
432 	if (ret == -ETIMEDOUT) {  in tpm_tis_lpc_open()
433 		printf("%s:%d - failed to lock locality %d\n",  in tpm_tis_lpc_open()
449 		return -ENOSPC;  in tpm_tis_get_desc()