GNU Linux-libre 4.19.264-gnu1
[releases.git] / arch / arm / mach-lpc32xx / common.c
1 /*
2  * arch/arm/mach-lpc32xx/common.c
3  *
4  * Author: Kevin Wells <kevin.wells@nxp.com>
5  *
6  * Copyright (C) 2010 NXP Semiconductors
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  */
18
19 #include <linux/init.h>
20
21 #include <asm/mach/map.h>
22 #include <asm/system_info.h>
23
24 #include <mach/hardware.h>
25 #include <mach/platform.h>
26 #include "common.h"
27
28 /*
29  * Returns the unique ID for the device
30  */
31 void lpc32xx_get_uid(u32 devid[4])
32 {
33         int i;
34
35         for (i = 0; i < 4; i++)
36                 devid[i] = __raw_readl(LPC32XX_CLKPWR_DEVID(i << 2));
37 }
38
39 /*
40  * Detects and returns IRAM size for the device variation
41  */
42 #define LPC32XX_IRAM_BANK_SIZE SZ_128K
43 static u32 iram_size;
44 u32 lpc32xx_return_iram_size(void)
45 {
46         if (iram_size == 0) {
47                 u32 savedval1, savedval2;
48                 void __iomem *iramptr1, *iramptr2;
49
50                 iramptr1 = io_p2v(LPC32XX_IRAM_BASE);
51                 iramptr2 = io_p2v(LPC32XX_IRAM_BASE + LPC32XX_IRAM_BANK_SIZE);
52                 savedval1 = __raw_readl(iramptr1);
53                 savedval2 = __raw_readl(iramptr2);
54
55                 if (savedval1 == savedval2) {
56                         __raw_writel(savedval2 + 1, iramptr2);
57                         if (__raw_readl(iramptr1) == savedval2 + 1)
58                                 iram_size = LPC32XX_IRAM_BANK_SIZE;
59                         else
60                                 iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
61                         __raw_writel(savedval2, iramptr2);
62                 } else
63                         iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
64         }
65
66         return iram_size;
67 }
68 EXPORT_SYMBOL_GPL(lpc32xx_return_iram_size);
69
70 static struct map_desc lpc32xx_io_desc[] __initdata = {
71         {
72                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_AHB0_START),
73                 .pfn            = __phys_to_pfn(LPC32XX_AHB0_START),
74                 .length         = LPC32XX_AHB0_SIZE,
75                 .type           = MT_DEVICE
76         },
77         {
78                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_AHB1_START),
79                 .pfn            = __phys_to_pfn(LPC32XX_AHB1_START),
80                 .length         = LPC32XX_AHB1_SIZE,
81                 .type           = MT_DEVICE
82         },
83         {
84                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_FABAPB_START),
85                 .pfn            = __phys_to_pfn(LPC32XX_FABAPB_START),
86                 .length         = LPC32XX_FABAPB_SIZE,
87                 .type           = MT_DEVICE
88         },
89         {
90                 .virtual        = (unsigned long)IO_ADDRESS(LPC32XX_IRAM_BASE),
91                 .pfn            = __phys_to_pfn(LPC32XX_IRAM_BASE),
92                 .length         = (LPC32XX_IRAM_BANK_SIZE * 2),
93                 .type           = MT_DEVICE
94         },
95 };
96
97 void __init lpc32xx_map_io(void)
98 {
99         iotable_init(lpc32xx_io_desc, ARRAY_SIZE(lpc32xx_io_desc));
100 }
101
102 static int __init lpc32xx_check_uid(void)
103 {
104         u32 uid[4];
105
106         lpc32xx_get_uid(uid);
107
108         printk(KERN_INFO "LPC32XX unique ID: %08x%08x%08x%08x\n",
109                 uid[3], uid[2], uid[1], uid[0]);
110
111         if (!system_serial_low && !system_serial_high) {
112                 system_serial_low = uid[0];
113                 system_serial_high = uid[1];
114         }
115
116         return 1;
117 }
118 arch_initcall(lpc32xx_check_uid);