1 // SPDX-License-Identifier: GPL-2.0+
17 static int rsa8250_request_resource(struct uart_8250_port *up)  in rsa8250_request_resource()  argument
19 	struct uart_port *port = &up->port;  in rsa8250_request_resource()
20 	unsigned long start = UART_RSA_BASE << port->regshift;  in rsa8250_request_resource()  local
21 	unsigned int size = 8 << port->regshift;  in rsa8250_request_resource()
23 	switch (port->iotype) {  in rsa8250_request_resource()
26 		start += port->iobase;  in rsa8250_request_resource()
27 		if (!request_region(start, size, "serial-rsa"))  in rsa8250_request_resource()
28 			return -EBUSY;  in rsa8250_request_resource()
31 		return -EINVAL;  in rsa8250_request_resource()
35 static void rsa8250_release_resource(struct uart_8250_port *up)  in rsa8250_release_resource()  argument
37 	struct uart_port *port = &up->port;  in rsa8250_release_resource()
38 	unsigned long offset = UART_RSA_BASE << port->regshift;  in rsa8250_release_resource()
39 	unsigned int size = 8 << port->regshift;  in rsa8250_release_resource()
41 	switch (port->iotype) {  in rsa8250_release_resource()
44 		release_region(port->iobase + offset, size);  in rsa8250_release_resource()
53 	struct uart_8250_port *up = up_to_u8250p(port);  in univ8250_config_port()  local
56 	up->probe &= ~UART_PROBE_RSA;  in univ8250_config_port()
57 	if (port->type == PORT_RSA) {  in univ8250_config_port()
58 		if (rsa8250_request_resource(up) == 0)  in univ8250_config_port()
59 			up->probe |= UART_PROBE_RSA;  in univ8250_config_port()
62 			if (probe_rsa[i] == up->port.iobase) {  in univ8250_config_port()
63 				if (rsa8250_request_resource(up) == 0)  in univ8250_config_port()
64 					up->probe |= UART_PROBE_RSA;  in univ8250_config_port()
70 	univ8250_port_base_ops->config_port(port, flags);  in univ8250_config_port()
72 	if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA)  in univ8250_config_port()
73 		rsa8250_release_resource(up);  in univ8250_config_port()
78 	struct uart_8250_port *up = up_to_u8250p(port);  in univ8250_request_port()  local
81 	ret = univ8250_port_base_ops->request_port(port);  in univ8250_request_port()
82 	if (ret == 0 && port->type == PORT_RSA) {  in univ8250_request_port()
83 		ret = rsa8250_request_resource(up);  in univ8250_request_port()
85 			univ8250_port_base_ops->release_port(port);  in univ8250_request_port()
93 	struct uart_8250_port *up = up_to_u8250p(port);  in univ8250_release_port()  local
95 	if (port->type == PORT_RSA)  in univ8250_release_port()
96 		rsa8250_release_resource(up);  in univ8250_release_port()
97 	univ8250_port_base_ops->release_port(port);  in univ8250_release_port()
102 	ops->config_port  = univ8250_config_port;  in univ8250_rsa_support()
103 	ops->request_port = univ8250_request_port;  in univ8250_rsa_support()
104 	ops->release_port = univ8250_release_port;  in univ8250_rsa_support()
114 static int __rsa_enable(struct uart_8250_port *up)  in __rsa_enable()  argument
119 	mode = serial_in(up, UART_RSA_MSR);  in __rsa_enable()
123 		serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);  in __rsa_enable()
124 		mode = serial_in(up, UART_RSA_MSR);  in __rsa_enable()
129 		up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;  in __rsa_enable()
135  * If this is an RSA port, see if we can kick it up to the higher speed clock.
137 void rsa_enable(struct uart_8250_port *up)  in rsa_enable()  argument
139 	if (up->port.type != PORT_RSA)  in rsa_enable()
142 	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {  in rsa_enable()
143 		uart_port_lock_irq(&up->port);  in rsa_enable()
144 		__rsa_enable(up);  in rsa_enable()
145 		uart_port_unlock_irq(&up->port);  in rsa_enable()
147 	if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)  in rsa_enable()
148 		serial_out(up, UART_RSA_FRR, 0);  in rsa_enable()
157 void rsa_disable(struct uart_8250_port *up)  in rsa_disable()  argument
162 	if (up->port.type != PORT_RSA)  in rsa_disable()
165 	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16)  in rsa_disable()
168 	uart_port_lock_irq(&up->port);  in rsa_disable()
169 	mode = serial_in(up, UART_RSA_MSR);  in rsa_disable()
173 		serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);  in rsa_disable()
174 		mode = serial_in(up, UART_RSA_MSR);  in rsa_disable()
179 		up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;  in rsa_disable()
180 	uart_port_unlock_irq(&up->port);  in rsa_disable()
184 void rsa_autoconfig(struct uart_8250_port *up)  in rsa_autoconfig()  argument
187 	if (up->port.type != PORT_16550A)  in rsa_autoconfig()
189 	if (!(up->probe & UART_PROBE_RSA))  in rsa_autoconfig()
192 	if (__rsa_enable(up))  in rsa_autoconfig()
193 		up->port.type = PORT_RSA;  in rsa_autoconfig()
197 void rsa_reset(struct uart_8250_port *up)  in rsa_reset()  argument
199 	if (up->port.type != PORT_RSA)  in rsa_reset()
202 	serial_out(up, UART_RSA_FRR, 0);  in rsa_reset()
225 		0444, -1, 0);  in rsa8250_options()