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1 /* SPDX-License-Identifier: GPL-2.0-only */
2 
3 /* Pre-RAM driver for the SMSC LPC47M15X Super I/O chip */
4 
5 #include <arch/io.h>
6 #include <device/pnp_ops.h>
7 #include <device/pnp.h>
8 #include <stdint.h>
9 
10 #include "lpc47m15x.h"
11 
pnp_enter_conf_state(pnp_devfn_t dev)12 static void pnp_enter_conf_state(pnp_devfn_t dev)
13 {
14 	u16 port = dev >> 8;
15 	outb(0x55, port);
16 }
17 
pnp_exit_conf_state(pnp_devfn_t dev)18 static void pnp_exit_conf_state(pnp_devfn_t dev)
19 {
20 	u16 port = dev >> 8;
21 	outb(0xaa, port);
22 }
23 
lpc47m15x_enable_serial(pnp_devfn_t dev,u16 iobase)24 void lpc47m15x_enable_serial(pnp_devfn_t dev, u16 iobase)
25 {
26 	pnp_enter_conf_state(dev);
27 	pnp_set_logical_device(dev);
28 	pnp_set_enable(dev, 0);
29 	pnp_set_iobase(dev, PNP_IDX_IO0, iobase);
30 	pnp_set_enable(dev, 1);
31 	pnp_exit_conf_state(dev);
32 }
33