xref: /openbmc/linux/arch/arm/mach-lpc32xx/common.c (revision d3532910)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * arch/arm/mach-lpc32xx/common.c
4  *
5  * Author: Kevin Wells <kevin.wells@nxp.com>
6  *
7  * Copyright (C) 2010 NXP Semiconductors
8  */
9 
10 #include <linux/init.h>
11 #include <linux/soc/nxp/lpc32xx-misc.h>
12 
13 #include <asm/mach/map.h>
14 #include <asm/system_info.h>
15 
16 #include "lpc32xx.h"
17 #include "common.h"
18 
19 /*
20  * Returns the unique ID for the device
21  */
lpc32xx_get_uid(u32 devid[4])22 void lpc32xx_get_uid(u32 devid[4])
23 {
24 	int i;
25 
26 	for (i = 0; i < 4; i++)
27 		devid[i] = __raw_readl(LPC32XX_CLKPWR_DEVID(i << 2));
28 }
29 
30 /*
31  * Detects and returns IRAM size for the device variation
32  */
33 #define LPC32XX_IRAM_BANK_SIZE SZ_128K
34 static u32 iram_size;
lpc32xx_return_iram(void __iomem ** mapbase,dma_addr_t * dmaaddr)35 u32 lpc32xx_return_iram(void __iomem **mapbase, dma_addr_t *dmaaddr)
36 {
37 	if (iram_size == 0) {
38 		u32 savedval1, savedval2;
39 		void __iomem *iramptr1, *iramptr2;
40 
41 		iramptr1 = io_p2v(LPC32XX_IRAM_BASE);
42 		iramptr2 = io_p2v(LPC32XX_IRAM_BASE + LPC32XX_IRAM_BANK_SIZE);
43 		savedval1 = __raw_readl(iramptr1);
44 		savedval2 = __raw_readl(iramptr2);
45 
46 		if (savedval1 == savedval2) {
47 			__raw_writel(savedval2 + 1, iramptr2);
48 			if (__raw_readl(iramptr1) == savedval2 + 1)
49 				iram_size = LPC32XX_IRAM_BANK_SIZE;
50 			else
51 				iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
52 			__raw_writel(savedval2, iramptr2);
53 		} else
54 			iram_size = LPC32XX_IRAM_BANK_SIZE * 2;
55 	}
56 	if (dmaaddr)
57 		*dmaaddr = LPC32XX_IRAM_BASE;
58 	if (mapbase)
59 		*mapbase = io_p2v(LPC32XX_IRAM_BASE);
60 
61 	return iram_size;
62 }
63 EXPORT_SYMBOL_GPL(lpc32xx_return_iram);
64 
lpc32xx_set_phy_interface_mode(phy_interface_t mode)65 void lpc32xx_set_phy_interface_mode(phy_interface_t mode)
66 {
67 	u32 tmp = __raw_readl(LPC32XX_CLKPWR_MACCLK_CTRL);
68 	tmp &= ~LPC32XX_CLKPWR_MACCTRL_PINS_MSK;
69 	if (mode == PHY_INTERFACE_MODE_MII)
70 		tmp |= LPC32XX_CLKPWR_MACCTRL_USE_MII_PINS;
71 	else
72 		tmp |= LPC32XX_CLKPWR_MACCTRL_USE_RMII_PINS;
73 	__raw_writel(tmp, LPC32XX_CLKPWR_MACCLK_CTRL);
74 }
75 EXPORT_SYMBOL_GPL(lpc32xx_set_phy_interface_mode);
76 
77 static struct map_desc lpc32xx_io_desc[] __initdata = {
78 	{
79 		.virtual	= (unsigned long)IO_ADDRESS(LPC32XX_AHB0_START),
80 		.pfn		= __phys_to_pfn(LPC32XX_AHB0_START),
81 		.length		= LPC32XX_AHB0_SIZE,
82 		.type		= MT_DEVICE
83 	},
84 	{
85 		.virtual	= (unsigned long)IO_ADDRESS(LPC32XX_AHB1_START),
86 		.pfn		= __phys_to_pfn(LPC32XX_AHB1_START),
87 		.length		= LPC32XX_AHB1_SIZE,
88 		.type		= MT_DEVICE
89 	},
90 	{
91 		.virtual	= (unsigned long)IO_ADDRESS(LPC32XX_FABAPB_START),
92 		.pfn		= __phys_to_pfn(LPC32XX_FABAPB_START),
93 		.length		= LPC32XX_FABAPB_SIZE,
94 		.type		= MT_DEVICE
95 	},
96 	{
97 		.virtual	= (unsigned long)IO_ADDRESS(LPC32XX_IRAM_BASE),
98 		.pfn		= __phys_to_pfn(LPC32XX_IRAM_BASE),
99 		.length		= (LPC32XX_IRAM_BANK_SIZE * 2),
100 		.type		= MT_DEVICE
101 	},
102 };
103 
lpc32xx_map_io(void)104 void __init lpc32xx_map_io(void)
105 {
106 	iotable_init(lpc32xx_io_desc, ARRAY_SIZE(lpc32xx_io_desc));
107 }
108 
lpc32xx_check_uid(void)109 static int __init lpc32xx_check_uid(void)
110 {
111 	u32 uid[4];
112 
113 	lpc32xx_get_uid(uid);
114 
115 	printk(KERN_INFO "LPC32XX unique ID: %08x%08x%08x%08x\n",
116 		uid[3], uid[2], uid[1], uid[0]);
117 
118 	if (!system_serial_low && !system_serial_high) {
119 		system_serial_low = uid[0];
120 		system_serial_high = uid[1];
121 	}
122 
123 	return 1;
124 }
125 arch_initcall(lpc32xx_check_uid);
126