1 /*
2  * Freescale Lite5200 board support
3  *
4  * Written by: Grant Likely <grant.likely@secretlab.ca>
5  *
6  * Copyright (C) Secret Lab Technologies Ltd. 2006. All rights reserved.
7  * Copyright 2006 Freescale Semiconductor, Inc. All rights reserved.
8  *
9  * Description:
10  * This program is free software; you can redistribute  it and/or modify it
11  * under  the terms of  the GNU General  Public License as published by the
12  * Free Software Foundation;  either version 2 of the  License, or (at your
13  * option) any later version.
14  */
15 
16 #undef DEBUG
17 
18 #include <linux/init.h>
19 #include <linux/pci.h>
20 #include <linux/of.h>
21 #include <linux/of_address.h>
22 #include <linux/root_dev.h>
23 #include <linux/initrd.h>
24 #include <asm/time.h>
25 #include <asm/io.h>
26 #include <asm/machdep.h>
27 #include <asm/prom.h>
28 #include <asm/mpc52xx.h>
29 
30 /* ************************************************************************
31  *
32  * Setup the architecture
33  *
34  */
35 
36 /* mpc5200 device tree match tables */
37 static const struct of_device_id mpc5200_cdm_ids[] __initconst = {
38 	{ .compatible = "fsl,mpc5200-cdm", },
39 	{ .compatible = "mpc5200-cdm", },
40 	{}
41 };
42 
43 static const struct of_device_id mpc5200_gpio_ids[] __initconst = {
44 	{ .compatible = "fsl,mpc5200-gpio", },
45 	{ .compatible = "mpc5200-gpio", },
46 	{}
47 };
48 
49 /*
50  * Fix clock configuration.
51  *
52  * Firmware is supposed to be responsible for this.  If you are creating a
53  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
54  * to set it correctly in the first place
55  */
56 static void __init
57 lite5200_fix_clock_config(void)
58 {
59 	struct device_node *np;
60 	struct mpc52xx_cdm  __iomem *cdm;
61 	/* Map zones */
62 	np = of_find_matching_node(NULL, mpc5200_cdm_ids);
63 	cdm = of_iomap(np, 0);
64 	of_node_put(np);
65 	if (!cdm) {
66 		printk(KERN_ERR "%s() failed; expect abnormal behaviour\n",
67 		       __func__);
68 		return;
69 	}
70 
71 	/* Use internal 48 Mhz */
72 	out_8(&cdm->ext_48mhz_en, 0x00);
73 	out_8(&cdm->fd_enable, 0x01);
74 	if (in_be32(&cdm->rstcfg) & 0x40)	/* Assumes 33Mhz clock */
75 		out_be16(&cdm->fd_counters, 0x0001);
76 	else
77 		out_be16(&cdm->fd_counters, 0x5555);
78 
79 	/* Unmap the regs */
80 	iounmap(cdm);
81 }
82 
83 /*
84  * Fix setting of port_config register.
85  *
86  * Firmware is supposed to be responsible for this.  If you are creating a
87  * new board port, do *NOT* duplicate this code.  Fix your boot firmware
88  * to set it correctly in the first place
89  */
90 static void __init
91 lite5200_fix_port_config(void)
92 {
93 	struct device_node *np;
94 	struct mpc52xx_gpio __iomem *gpio;
95 	u32 port_config;
96 
97 	np = of_find_matching_node(NULL, mpc5200_gpio_ids);
98 	gpio = of_iomap(np, 0);
99 	of_node_put(np);
100 	if (!gpio) {
101 		printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
102 		       __func__);
103 		return;
104 	}
105 
106 	/* Set port config */
107 	port_config = in_be32(&gpio->port_config);
108 
109 	port_config &= ~0x00800000;	/* 48Mhz internal, pin is GPIO	*/
110 
111 	port_config &= ~0x00007000;	/* USB port : Differential mode	*/
112 	port_config |=  0x00001000;	/*            USB 1 only	*/
113 
114 	port_config &= ~0x03000000;	/* ATA CS is on csb_4/5		*/
115 	port_config |=  0x01000000;
116 
117 	pr_debug("port_config: old:%x new:%x\n",
118 	         in_be32(&gpio->port_config), port_config);
119 	out_be32(&gpio->port_config, port_config);
120 
121 	/* Unmap zone */
122 	iounmap(gpio);
123 }
124 
125 #ifdef CONFIG_PM
126 static void lite5200_suspend_prepare(void __iomem *mbar)
127 {
128 	u8 pin = 1;	/* GPIO_WKUP_1 (GPIO_PSC2_4) */
129 	u8 level = 0;	/* wakeup on low level */
130 	mpc52xx_set_wakeup_gpio(pin, level);
131 
132 	/*
133 	 * power down usb port
134 	 * this needs to be called before of-ohci suspend code
135 	 */
136 
137 	/* set ports to "power switched" and "powered at the same time"
138 	 * USB Rh descriptor A: NPS = 0, PSM = 0 */
139 	out_be32(mbar + 0x1048, in_be32(mbar + 0x1048) & ~0x300);
140 	/* USB Rh status: LPS = 1 - turn off power */
141 	out_be32(mbar + 0x1050, 0x00000001);
142 }
143 
144 static void lite5200_resume_finish(void __iomem *mbar)
145 {
146 	/* USB Rh status: LPSC = 1 - turn on power */
147 	out_be32(mbar + 0x1050, 0x00010000);
148 }
149 #endif
150 
151 static void __init lite5200_setup_arch(void)
152 {
153 	if (ppc_md.progress)
154 		ppc_md.progress("lite5200_setup_arch()", 0);
155 
156 	/* Map important registers from the internal memory map */
157 	mpc52xx_map_common_devices();
158 
159 	/* Some mpc5200 & mpc5200b related configuration */
160 	mpc5200_setup_xlb_arbiter();
161 
162 	/* Fix things that firmware should have done. */
163 	lite5200_fix_clock_config();
164 	lite5200_fix_port_config();
165 
166 #ifdef CONFIG_PM
167 	mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
168 	mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
169 	lite5200_pm_init();
170 #endif
171 
172 	mpc52xx_setup_pci();
173 }
174 
175 static const char * const board[] __initconst = {
176 	"fsl,lite5200",
177 	"fsl,lite5200b",
178 	NULL,
179 };
180 
181 /*
182  * Called very early, MMU is off, device-tree isn't unflattened
183  */
184 static int __init lite5200_probe(void)
185 {
186 	return of_flat_dt_match(of_get_flat_dt_root(), board);
187 }
188 
189 define_machine(lite5200) {
190 	.name 		= "lite5200",
191 	.probe 		= lite5200_probe,
192 	.setup_arch 	= lite5200_setup_arch,
193 	.init		= mpc52xx_declare_of_platform_devices,
194 	.init_IRQ 	= mpc52xx_init_irq,
195 	.get_irq 	= mpc52xx_get_irq,
196 	.restart	= mpc52xx_restart,
197 	.calibrate_decr	= generic_calibrate_decr,
198 };
199