1 // SPDX-License-Identifier: GPL-2.0-only
18  * TXFE == 0 instead of BUSY == 1. This may not be suitable for all UART
26  * Some Qualcomm Datacenter Technologies SoCs have a defective UART BUSY bit.
32 	if (memcmp(h->oem_id, "QCOM  ", ACPI_OEM_ID_SIZE))  in qdf2400_erratum_44_present()
35 	if (!memcmp(h->oem_table_id, "QDF2432 ", ACPI_OEM_TABLE_ID_SIZE))  in qdf2400_erratum_44_present()
38 	if (!memcmp(h->oem_table_id, "QDF2400 ", ACPI_OEM_TABLE_ID_SIZE) &&  in qdf2400_erratum_44_present()
39 			h->oem_revision == 1)  in qdf2400_erratum_44_present()
46  * APM X-Gene v1 and v2 UART hardware is an 16550 like device but has its
47  * register aligned to 32-bit. In addition, the BIOS also encoded the
54 	if (tb->interface_type != ACPI_DBG2_16550_COMPATIBLE)  in xgene_8250_erratum_present()
57 	if (memcmp(tb->header.oem_id, "APMC0D", ACPI_OEM_ID_SIZE) &&  in xgene_8250_erratum_present()
58 	    memcmp(tb->header.oem_id, "HPE   ", ACPI_OEM_ID_SIZE))  in xgene_8250_erratum_present()
61 	if (!memcmp(tb->header.oem_table_id, "XGENESPC",  in xgene_8250_erratum_present()
62 	    ACPI_OEM_TABLE_ID_SIZE) && tb->header.oem_revision == 0)  in xgene_8250_erratum_present()
65 	if (!memcmp(tb->header.oem_table_id, "ProLiant",  in xgene_8250_erratum_present()
66 	    ACPI_OEM_TABLE_ID_SIZE) && tb->header.oem_revision == 1)  in xgene_8250_erratum_present()
73  * acpi_parse_spcr() - parse ACPI SPCR table and add preferred console
90 	char *uart;  in acpi_parse_spcr()  local
96 		return -ENODEV;  in acpi_parse_spcr()
100 		return -ENOENT;  in acpi_parse_spcr()
102 	if (table->header.revision < 2)  in acpi_parse_spcr()
103 		pr_info("SPCR table version %d\n", table->header.revision);  in acpi_parse_spcr()
105 	if (table->serial_port.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {  in acpi_parse_spcr()
106 		u32 bit_width = table->serial_port.access_width;  in acpi_parse_spcr()
129 	switch (table->interface_type) {  in acpi_parse_spcr()
136 		uart = "pl011";  in acpi_parse_spcr()
142 		uart = "uart";  in acpi_parse_spcr()
145 		err = -ENOENT;  in acpi_parse_spcr()
149 	switch (table->baud_rate) {  in acpi_parse_spcr()
152 		 * SPCR 1.04 defines 0 as a preconfigured state of UART.  in acpi_parse_spcr()
170 		err = -ENOENT;  in acpi_parse_spcr()
176 	 * driver to implement the work-around.  in acpi_parse_spcr()
192 	if (qdf2400_erratum_44_present(&table->header)) {  in acpi_parse_spcr()
195 			uart = "qdf2400_e44";  in acpi_parse_spcr()
203 		 * UART so don't attempt to change to the baud rate state  in acpi_parse_spcr()
210 		snprintf(opts, sizeof(opts), "%s,%s,0x%llx", uart, iotype,  in acpi_parse_spcr()
211 			 table->serial_port.address);  in acpi_parse_spcr()
213 		snprintf(opts, sizeof(opts), "%s,%s,0x%llx,%d", uart, iotype,  in acpi_parse_spcr()
214 			 table->serial_port.address, baud_rate);  in acpi_parse_spcr()
223 		err = add_preferred_console(uart, 0, opts + strlen(uart) + 1);  in acpi_parse_spcr()