1// SPDX-License-Identifier: GPL-2.0
 2//
 3// Copyright (C) 2013 Samsung Electronics Co., Ltd.
 4//	Tomasz Figa <t.figa@samsung.com>
 5// Copyright (C) 2008 Openmoko, Inc.
 6// Copyright (C) 2004-2008 Simtec Electronics
 7//	Ben Dooks <ben@simtec.co.uk>
 8//	http://armlinux.simtec.co.uk/
 9//
10// Samsung common power management (suspend to RAM) debug support
11
12#include <linux/serial_core.h>
13#include <linux/serial_s3c.h>
14#include <linux/io.h>
15
16#include <asm/mach/map.h>
17
18#include <linux/soc/samsung/s3c-pm.h>
19
20static struct pm_uart_save uart_save;
21
22extern void printascii(const char *);
23
24void s3c_pm_dbg(const char *fmt, ...)
25{
26	va_list va;
27	char buff[256];
28
29	va_start(va, fmt);
30	vsnprintf(buff, sizeof(buff), fmt, va);
31	va_end(va);
32
33	printascii(buff);
34}
35
36static inline void __iomem *s3c_pm_uart_base(void)
37{
38	unsigned long paddr;
39	unsigned long vaddr;
40
41	debug_ll_addr(&paddr, &vaddr);
42
43	return (void __iomem *)vaddr;
44}
45
46void s3c_pm_save_uarts(bool is_s3c2410)
47{
48	void __iomem *regs = s3c_pm_uart_base();
49	struct pm_uart_save *save = &uart_save;
50
51	save->ulcon = __raw_readl(regs + S3C2410_ULCON);
52	save->ucon = __raw_readl(regs + S3C2410_UCON);
53	save->ufcon = __raw_readl(regs + S3C2410_UFCON);
54	save->umcon = __raw_readl(regs + S3C2410_UMCON);
55	save->ubrdiv = __raw_readl(regs + S3C2410_UBRDIV);
56
57	if (!is_s3c2410)
58		save->udivslot = __raw_readl(regs + S3C2443_DIVSLOT);
59
60	S3C_PMDBG("UART[%p]: ULCON=%04x, UCON=%04x, UFCON=%04x, UBRDIV=%04x\n",
61		  regs, save->ulcon, save->ucon, save->ufcon, save->ubrdiv);
62}
63
64void s3c_pm_restore_uarts(bool is_s3c2410)
65{
66	void __iomem *regs = s3c_pm_uart_base();
67	struct pm_uart_save *save = &uart_save;
68
69	s3c_pm_arch_update_uart(regs, save);
70
71	__raw_writel(save->ulcon, regs + S3C2410_ULCON);
72	__raw_writel(save->ucon,  regs + S3C2410_UCON);
73	__raw_writel(save->ufcon, regs + S3C2410_UFCON);
74	__raw_writel(save->umcon, regs + S3C2410_UMCON);
75	__raw_writel(save->ubrdiv, regs + S3C2410_UBRDIV);
76
77	if (!is_s3c2410)
78		__raw_writel(save->udivslot, regs + S3C2443_DIVSLOT);
79}