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
20 static struct pm_uart_save uart_save;
21
22 extern void printascii(const char *);
23
s3c_pm_dbg(const char * fmt,...)24 void 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
s3c_pm_uart_base(void)36 static 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
s3c_pm_save_uarts(bool is_s3c2410)46 void 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
s3c_pm_restore_uarts(bool is_s3c2410)64 void 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 }
80