1 // SPDX-License-Identifier: GPL-2.0-only
3  * Amlogic Secure Monitor driver
9 #define pr_fmt(fmt) "meson-sm: " fmt
11 #include <linux/arm-smccc.h>
24 #include <linux/firmware/meson/meson_sm.h>
63 	const struct meson_sm_cmd *cmd = chip->cmd;  in meson_sm_get_cmd()
65 	while (cmd->smc_id && cmd->index != cmd_index)  in meson_sm_get_cmd()
68 	return cmd->smc_id;  in meson_sm_get_cmd()
92  * meson_sm_call - generic SMC32 call to the secure-monitor
94  * @fw:		Pointer to secure-monitor firmware
111 	if (!fw->chip)  in meson_sm_call()
112 		return -ENOENT;  in meson_sm_call()
114 	cmd = meson_sm_get_cmd(fw->chip, cmd_index);  in meson_sm_call()
116 		return -EINVAL;  in meson_sm_call()
128  * meson_sm_call_read - retrieve data from secure-monitor
130  * @fw:		Pointer to secure-monitor firmware
151 	if (!fw->chip)  in meson_sm_call_read()
152 		return -ENOENT;  in meson_sm_call_read()
154 	if (!fw->chip->cmd_shmem_out_base)  in meson_sm_call_read()
155 		return -EINVAL;  in meson_sm_call_read()
157 	if (bsize > fw->chip->shmem_size)  in meson_sm_call_read()
158 		return -EINVAL;  in meson_sm_call_read()
161 		return -EINVAL;  in meson_sm_call_read()
164 		return -EINVAL;  in meson_sm_call_read()
177 		memcpy(buffer, fw->sm_shmem_out_base, size);  in meson_sm_call_read()
184  * meson_sm_call_write - send data to secure-monitor
186  * @fw:		Pointer to secure-monitor firmware
204 	if (!fw->chip)  in meson_sm_call_write()
205 		return -ENOENT;  in meson_sm_call_write()
207 	if (size > fw->chip->shmem_size)  in meson_sm_call_write()
208 		return -EINVAL;  in meson_sm_call_write()
210 	if (!fw->chip->cmd_shmem_in_base)  in meson_sm_call_write()
211 		return -EINVAL;  in meson_sm_call_write()
213 	memcpy(fw->sm_shmem_in_base, buffer, size);  in meson_sm_call_write()
216 		return -EINVAL;  in meson_sm_call_write()
219 		return -EINVAL;  in meson_sm_call_write()
226  * meson_sm_get - get pointer to meson_sm_firmware structure.
228  * @sm_node:		Pointer to the secure-monitor Device Tree node.
230  * Return:		NULL is the secure-monitor device is not ready.
259 		return -ENOMEM;  in serial_show()
284 	{ .compatible = "amlogic,meson-gxbb-sm", .data = &gxbb_chip },
290 	struct device *dev = &pdev->dev;  in meson_sm_probe()
296 		return -ENOMEM;  in meson_sm_probe()
300 		return -EINVAL;  in meson_sm_probe()
302 	if (chip->cmd_shmem_in_base) {  in meson_sm_probe()
303 		fw->sm_shmem_in_base = meson_sm_map_shmem(chip->cmd_shmem_in_base,  in meson_sm_probe()
304 							  chip->shmem_size);  in meson_sm_probe()
305 		if (WARN_ON(!fw->sm_shmem_in_base))  in meson_sm_probe()
309 	if (chip->cmd_shmem_out_base) {  in meson_sm_probe()
310 		fw->sm_shmem_out_base = meson_sm_map_shmem(chip->cmd_shmem_out_base,  in meson_sm_probe()
311 							   chip->shmem_size);  in meson_sm_probe()
312 		if (WARN_ON(!fw->sm_shmem_out_base))  in meson_sm_probe()
316 	fw->chip = chip;  in meson_sm_probe()
323 	pr_info("secure-monitor enabled\n");  in meson_sm_probe()
328 	iounmap(fw->sm_shmem_out_base);  in meson_sm_probe()
330 	iounmap(fw->sm_shmem_in_base);  in meson_sm_probe()
332 	return -EINVAL;  in meson_sm_probe()
337 		.name = "meson-sm",
343 MODULE_DESCRIPTION("Amlogic Secure Monitor driver");