1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Freescale Lite5200 board support
4  *
5  * Written by: Grant Likely <grant.likely@secretlab.ca>
6  *
7  * Copyright (C) Secret Lab Technologies Ltd. 2006. All rights reserved.
8  * Copyright 2006 Freescale Semiconductor, Inc. All rights reserved.
9  *
10  * Description:
11  */
12 
13 #undef DEBUG
14 
15 #include <linux/init.h>
16 #include <linux/pci.h>
17 #include <linux/of.h>
18 #include <linux/of_address.h>
19 #include <linux/root_dev.h>
20 #include <linux/initrd.h>
21 #include <asm/time.h>
22 #include <asm/io.h>
23 #include <asm/machdep.h>
24 #include <asm/mpc52xx.h>
25 
26 /* ************************************************************************
27  *
28  * Setup the architecture
29  *
30  */
31 
32 /* mpc5200 device tree match tables */
33 static const struct of_device_id mpc5200_cdm_ids[] __initconst = {
34 	{ .compatible = "fsl,mpc5200-cdm", },
35 	{ .compatible = "mpc5200-cdm", },
36 	{}
37 };
38 
39 static const struct of_device_id mpc5200_gpio_ids[] __initconst = {
40 	{ .compatible = "fsl,mpc5200-gpio", },
41 	{ .compatible = "mpc5200-gpio", },
42 	{}
43 };
44 
45 /*
46  * Fix clock configuration.
47  *
48  * Firmware is supposed to be responsible for this.  If you are creating a
49  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
50  * to set it correctly in the first place
51  */
52 static void __init
53 lite5200_fix_clock_config(void)
54 {
55 	struct device_node *np;
56 	struct mpc52xx_cdm  __iomem *cdm;
57 	/* Map zones */
58 	np = of_find_matching_node(NULL, mpc5200_cdm_ids);
59 	cdm = of_iomap(np, 0);
60 	of_node_put(np);
61 	if (!cdm) {
62 		printk(KERN_ERR "%s() failed; expect abnormal behaviour\n",
63 		       __func__);
64 		return;
65 	}
66 
67 	/* Use internal 48 Mhz */
68 	out_8(&cdm->ext_48mhz_en, 0x00);
69 	out_8(&cdm->fd_enable, 0x01);
70 	if (in_be32(&cdm->rstcfg) & 0x40)	/* Assumes 33Mhz clock */
71 		out_be16(&cdm->fd_counters, 0x0001);
72 	else
73 		out_be16(&cdm->fd_counters, 0x5555);
74 
75 	/* Unmap the regs */
76 	iounmap(cdm);
77 }
78 
79 /*
80  * Fix setting of port_config register.
81  *
82  * Firmware is supposed to be responsible for this.  If you are creating a
83  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
84  * to set it correctly in the first place
85  */
86 static void __init
87 lite5200_fix_port_config(void)
88 {
89 	struct device_node *np;
90 	struct mpc52xx_gpio __iomem *gpio;
91 	u32 port_config;
92 
93 	np = of_find_matching_node(NULL, mpc5200_gpio_ids);
94 	gpio = of_iomap(np, 0);
95 	of_node_put(np);
96 	if (!gpio) {
97 		printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
98 		       __func__);
99 		return;
100 	}
101 
102 	/* Set port config */
103 	port_config = in_be32(&gpio->port_config);
104 
105 	port_config &= ~0x00800000;	/* 48Mhz internal, pin is GPIO	*/
106 
107 	port_config &= ~0x00007000;	/* USB port : Differential mode	*/
108 	port_config |=  0x00001000;	/*            USB 1 only	*/
109 
110 	port_config &= ~0x03000000;	/* ATA CS is on csb_4/5		*/
111 	port_config |=  0x01000000;
112 
113 	pr_debug("port_config: old:%x new:%x\n",
114 	         in_be32(&gpio->port_config), port_config);
115 	out_be32(&gpio->port_config, port_config);
116 
117 	/* Unmap zone */
118 	iounmap(gpio);
119 }
120 
121 #ifdef CONFIG_PM
122 static void lite5200_suspend_prepare(void __iomem *mbar)
123 {
124 	u8 pin = 1;	/* GPIO_WKUP_1 (GPIO_PSC2_4) */
125 	u8 level = 0;	/* wakeup on low level */
126 	mpc52xx_set_wakeup_gpio(pin, level);
127 
128 	/*
129 	 * power down usb port
130 	 * this needs to be called before of-ohci suspend code
131 	 */
132 
133 	/* set ports to "power switched" and "powered at the same time"
134 	 * USB Rh descriptor A: NPS = 0, PSM = 0 */
135 	out_be32(mbar + 0x1048, in_be32(mbar + 0x1048) & ~0x300);
136 	/* USB Rh status: LPS = 1 - turn off power */
137 	out_be32(mbar + 0x1050, 0x00000001);
138 }
139 
140 static void lite5200_resume_finish(void __iomem *mbar)
141 {
142 	/* USB Rh status: LPSC = 1 - turn on power */
143 	out_be32(mbar + 0x1050, 0x00010000);
144 }
145 #endif
146 
147 static void __init lite5200_setup_arch(void)
148 {
149 	if (ppc_md.progress)
150 		ppc_md.progress("lite5200_setup_arch()", 0);
151 
152 	/* Map important registers from the internal memory map */
153 	mpc52xx_map_common_devices();
154 
155 	/* Some mpc5200 & mpc5200b related configuration */
156 	mpc5200_setup_xlb_arbiter();
157 
158 	/* Fix things that firmware should have done. */
159 	lite5200_fix_clock_config();
160 	lite5200_fix_port_config();
161 
162 #ifdef CONFIG_PM
163 	mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
164 	mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
165 	lite5200_pm_init();
166 #endif
167 }
168 
169 static const char * const board[] __initconst = {
170 	"fsl,lite5200",
171 	"fsl,lite5200b",
172 	NULL,
173 };
174 
175 /*
176  * Called very early, MMU is off, device-tree isn't unflattened
177  */
178 static int __init lite5200_probe(void)
179 {
180 	return of_device_compatible_match(of_root, board);
181 }
182 
183 define_machine(lite5200) {
184 	.name 		= "lite5200",
185 	.probe 		= lite5200_probe,
186 	.setup_arch 	= lite5200_setup_arch,
187 	.discover_phbs	= mpc52xx_setup_pci,
188 	.init		= mpc52xx_declare_of_platform_devices,
189 	.init_IRQ 	= mpc52xx_init_irq,
190 	.get_irq 	= mpc52xx_get_irq,
191 	.restart	= mpc52xx_restart,
192 };
193