1 // SPDX-License-Identifier: GPL-2.0-or-later
20 #include <asm/isa-bridge.h>
22 static int opal_lpc_chip_id = -1;
120 	while(c--)  in opal_lpc_insb()
128 	while(c--)  in opal_lpc_insw()
136 	while(c--)  in opal_lpc_insl()
144 	while(c--)  in opal_lpc_outsb()
152 	while(c--)  in opal_lpc_outsw()
160 	while(c--)  in opal_lpc_outsl()
187 	struct lpc_debugfs_entry *lpc = filp->private_data;  in lpc_debug_read()
192 		return -EFAULT;  in lpc_debug_read()
204 		if (lpc->lpc_type == OPAL_LPC_FW) {  in lpc_debug_read()
210 		rc = opal_lpc_read(opal_lpc_chip_id, lpc->lpc_type, pos,  in lpc_debug_read()
213 			return -ENXIO;  in lpc_debug_read()
217 		 * as it's the desired data right justified in a 32-bit BE  in lpc_debug_read()
220 		 * This is a very bad interface and I'm to blame for it :-(  in lpc_debug_read()
222 		 * So we can't just apply a 32-bit swap to what comes from OPAL,  in lpc_debug_read()
234 		 *   32-bit:   B0 B1 B2 B3   B0B1B2B3      B3B2B1B0  in lpc_debug_read()
235 		 *   16-bit:   B0 B1         0000B0B1      B1B00000  in lpc_debug_read()
236 		 *    8-bit:   B0            000000B0      B0000000  in lpc_debug_read()
238 		 * So a BE kernel will have the leftmost of the above in the MSB  in lpc_debug_read()
266 			return -EFAULT;  in lpc_debug_read()
269 		todo -= len;  in lpc_debug_read()
278 	struct lpc_debugfs_entry *lpc = filp->private_data;  in lpc_debug_write()
283 		return -EFAULT;  in lpc_debug_write()
295 		if (lpc->lpc_type == OPAL_LPC_FW) {  in lpc_debug_write()
310 		 * of the byte sequence. IE: for a 32-bit access, byte 0 should be  in lpc_debug_write()
311 		 * in the MSB. So here we *do* need to byteswap on LE.  in lpc_debug_write()
314 		 *  32-bit:  B0 B1 B2 B3    B3B2B1B0   B0B1B2B3  in lpc_debug_write()
315 		 *  16-bit:  B0 B1          0000B1B0   0000B0B1  in lpc_debug_write()
316 		 *   8-bit:  B0             000000B0   000000B0  in lpc_debug_write()
332 			return -EFAULT;  in lpc_debug_write()
334 		rc = opal_lpc_write(opal_lpc_chip_id, lpc->lpc_type, pos,  in lpc_debug_write()
337 			return -ENXIO;  in lpc_debug_write()
340 		todo -= len;  in lpc_debug_write()
360 		return -ENOMEM;  in opal_lpc_debugfs_create_type()
361 	entry->lpc_type = type;  in opal_lpc_debugfs_create_type()
372 		return -ENODEV;  in opal_lpc_init_debugfs()
393 	for_each_compatible_node(np, NULL, "ibm,power8-lpc") {  in opal_lpc_init()
411 		pr_info("OPAL: Found non-mapped LPC bus on chip %d\n",  in opal_lpc_init()