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/prom.h>
25 #include <asm/mpc52xx.h>
26 
27 /* ************************************************************************
28  *
29  * Setup the architecture
30  *
31  */
32 
33 /* mpc5200 device tree match tables */
34 static const struct of_device_id mpc5200_cdm_ids[] __initconst = {
35 	{ .compatible = "fsl,mpc5200-cdm", },
36 	{ .compatible = "mpc5200-cdm", },
37 	{}
38 };
39 
40 static const struct of_device_id mpc5200_gpio_ids[] __initconst = {
41 	{ .compatible = "fsl,mpc5200-gpio", },
42 	{ .compatible = "mpc5200-gpio", },
43 	{}
44 };
45 
46 /*
47  * Fix clock configuration.
48  *
49  * Firmware is supposed to be responsible for this.  If you are creating a
50  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
51  * to set it correctly in the first place
52  */
53 static void __init
54 lite5200_fix_clock_config(void)
55 {
56 	struct device_node *np;
57 	struct mpc52xx_cdm  __iomem *cdm;
58 	/* Map zones */
59 	np = of_find_matching_node(NULL, mpc5200_cdm_ids);
60 	cdm = of_iomap(np, 0);
61 	of_node_put(np);
62 	if (!cdm) {
63 		printk(KERN_ERR "%s() failed; expect abnormal behaviour\n",
64 		       __func__);
65 		return;
66 	}
67 
68 	/* Use internal 48 Mhz */
69 	out_8(&cdm->ext_48mhz_en, 0x00);
70 	out_8(&cdm->fd_enable, 0x01);
71 	if (in_be32(&cdm->rstcfg) & 0x40)	/* Assumes 33Mhz clock */
72 		out_be16(&cdm->fd_counters, 0x0001);
73 	else
74 		out_be16(&cdm->fd_counters, 0x5555);
75 
76 	/* Unmap the regs */
77 	iounmap(cdm);
78 }
79 
80 /*
81  * Fix setting of port_config register.
82  *
83  * Firmware is supposed to be responsible for this.  If you are creating a
84  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
85  * to set it correctly in the first place
86  */
87 static void __init
88 lite5200_fix_port_config(void)
89 {
90 	struct device_node *np;
91 	struct mpc52xx_gpio __iomem *gpio;
92 	u32 port_config;
93 
94 	np = of_find_matching_node(NULL, mpc5200_gpio_ids);
95 	gpio = of_iomap(np, 0);
96 	of_node_put(np);
97 	if (!gpio) {
98 		printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
99 		       __func__);
100 		return;
101 	}
102 
103 	/* Set port config */
104 	port_config = in_be32(&gpio->port_config);
105 
106 	port_config &= ~0x00800000;	/* 48Mhz internal, pin is GPIO	*/
107 
108 	port_config &= ~0x00007000;	/* USB port : Differential mode	*/
109 	port_config |=  0x00001000;	/*            USB 1 only	*/
110 
111 	port_config &= ~0x03000000;	/* ATA CS is on csb_4/5		*/
112 	port_config |=  0x01000000;
113 
114 	pr_debug("port_config: old:%x new:%x\n",
115 	         in_be32(&gpio->port_config), port_config);
116 	out_be32(&gpio->port_config, port_config);
117 
118 	/* Unmap zone */
119 	iounmap(gpio);
120 }
121 
122 #ifdef CONFIG_PM
123 static void lite5200_suspend_prepare(void __iomem *mbar)
124 {
125 	u8 pin = 1;	/* GPIO_WKUP_1 (GPIO_PSC2_4) */
126 	u8 level = 0;	/* wakeup on low level */
127 	mpc52xx_set_wakeup_gpio(pin, level);
128 
129 	/*
130 	 * power down usb port
131 	 * this needs to be called before of-ohci suspend code
132 	 */
133 
134 	/* set ports to "power switched" and "powered at the same time"
135 	 * USB Rh descriptor A: NPS = 0, PSM = 0 */
136 	out_be32(mbar + 0x1048, in_be32(mbar + 0x1048) & ~0x300);
137 	/* USB Rh status: LPS = 1 - turn off power */
138 	out_be32(mbar + 0x1050, 0x00000001);
139 }
140 
141 static void lite5200_resume_finish(void __iomem *mbar)
142 {
143 	/* USB Rh status: LPSC = 1 - turn on power */
144 	out_be32(mbar + 0x1050, 0x00010000);
145 }
146 #endif
147 
148 static void __init lite5200_setup_arch(void)
149 {
150 	if (ppc_md.progress)
151 		ppc_md.progress("lite5200_setup_arch()", 0);
152 
153 	/* Map important registers from the internal memory map */
154 	mpc52xx_map_common_devices();
155 
156 	/* Some mpc5200 & mpc5200b related configuration */
157 	mpc5200_setup_xlb_arbiter();
158 
159 	/* Fix things that firmware should have done. */
160 	lite5200_fix_clock_config();
161 	lite5200_fix_port_config();
162 
163 #ifdef CONFIG_PM
164 	mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
165 	mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
166 	lite5200_pm_init();
167 #endif
168 }
169 
170 static const char * const board[] __initconst = {
171 	"fsl,lite5200",
172 	"fsl,lite5200b",
173 	NULL,
174 };
175 
176 /*
177  * Called very early, MMU is off, device-tree isn't unflattened
178  */
179 static int __init lite5200_probe(void)
180 {
181 	return of_device_compatible_match(of_root, board);
182 }
183 
184 define_machine(lite5200) {
185 	.name 		= "lite5200",
186 	.probe 		= lite5200_probe,
187 	.setup_arch 	= lite5200_setup_arch,
188 	.discover_phbs	= mpc52xx_setup_pci,
189 	.init		= mpc52xx_declare_of_platform_devices,
190 	.init_IRQ 	= mpc52xx_init_irq,
191 	.get_irq 	= mpc52xx_get_irq,
192 	.restart	= mpc52xx_restart,
193 	.calibrate_decr	= generic_calibrate_decr,
194 };
195