1 // SPDX-License-Identifier: GPL-2.0-only
9 #define pr_fmt(fmt) "meson-sm: " fmt
11 #include <linux/arm-smccc.h>
23 #include <linux/firmware/meson/meson_sm.h>
62 	const struct meson_sm_cmd *cmd = chip->cmd;  in meson_sm_get_cmd()
64 	while (cmd->smc_id && cmd->index != cmd_index)  in meson_sm_get_cmd()
67 	return cmd->smc_id;  in meson_sm_get_cmd()
91  * meson_sm_call - generic SMC32 call to the secure-monitor
93  * @fw:		Pointer to secure-monitor firmware
109 	if (!fw->chip)  in meson_sm_call()
110 		return -ENOENT;  in meson_sm_call()
112 	cmd = meson_sm_get_cmd(fw->chip, cmd_index);  in meson_sm_call()
114 		return -EINVAL;  in meson_sm_call()
126  * meson_sm_call_read - retrieve data from secure-monitor
128  * @fw:		Pointer to secure-monitor firmware
149 	if (!fw->chip)  in meson_sm_call_read()
150 		return -ENOENT;  in meson_sm_call_read()
152 	if (!fw->chip->cmd_shmem_out_base)  in meson_sm_call_read()
153 		return -EINVAL;  in meson_sm_call_read()
155 	if (bsize > fw->chip->shmem_size)  in meson_sm_call_read()
156 		return -EINVAL;  in meson_sm_call_read()
159 		return -EINVAL;  in meson_sm_call_read()
162 		return -EINVAL;  in meson_sm_call_read()
170 		memcpy(buffer, fw->sm_shmem_out_base, size);  in meson_sm_call_read()
177  * meson_sm_call_write - send data to secure-monitor
179  * @fw:		Pointer to secure-monitor firmware
197 	if (!fw->chip)  in meson_sm_call_write()
198 		return -ENOENT;  in meson_sm_call_write()
200 	if (size > fw->chip->shmem_size)  in meson_sm_call_write()
201 		return -EINVAL;  in meson_sm_call_write()
203 	if (!fw->chip->cmd_shmem_in_base)  in meson_sm_call_write()
204 		return -EINVAL;  in meson_sm_call_write()
206 	memcpy(fw->sm_shmem_in_base, buffer, size);  in meson_sm_call_write()
209 		return -EINVAL;  in meson_sm_call_write()
212 		return -EINVAL;  in meson_sm_call_write()
219  * meson_sm_get - get pointer to meson_sm_firmware structure.
221  * @sm_node:		Pointer to the secure-monitor Device Tree node.
223  * Return:		NULL is the secure-monitor device is not ready.
252 		return -ENOMEM;  in serial_show()
280 	{ .compatible = "amlogic,meson-gxbb-sm", .data = &gxbb_chip },
286 	struct device *dev = &pdev->dev;  in meson_sm_probe()
292 		return -ENOMEM;  in meson_sm_probe()
294 	chip = of_match_device(meson_sm_ids, dev)->data;  in meson_sm_probe()
296 	if (chip->cmd_shmem_in_base) {  in meson_sm_probe()
297 		fw->sm_shmem_in_base = meson_sm_map_shmem(chip->cmd_shmem_in_base,  in meson_sm_probe()
298 							  chip->shmem_size);  in meson_sm_probe()
299 		if (WARN_ON(!fw->sm_shmem_in_base))  in meson_sm_probe()
303 	if (chip->cmd_shmem_out_base) {  in meson_sm_probe()
304 		fw->sm_shmem_out_base = meson_sm_map_shmem(chip->cmd_shmem_out_base,  in meson_sm_probe()
305 							   chip->shmem_size);  in meson_sm_probe()
306 		if (WARN_ON(!fw->sm_shmem_out_base))  in meson_sm_probe()
310 	fw->chip = chip;  in meson_sm_probe()
314 	pr_info("secure-monitor enabled\n");  in meson_sm_probe()
316 	if (sysfs_create_group(&pdev->dev.kobj, &meson_sm_sysfs_attr_group))  in meson_sm_probe()
322 	iounmap(fw->sm_shmem_in_base);  in meson_sm_probe()
324 	return -EINVAL;  in meson_sm_probe()
329 		.name = "meson-sm",