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Linux/arch/powerpc/platforms/52xx/lite5200.c

  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 struct of_device_id mpc5200_cdm_ids[] __initdata = {
 38         { .compatible = "fsl,mpc5200-cdm", },
 39         { .compatible = "mpc5200-cdm", },
 40         {}
 41 };
 42 
 43 static struct of_device_id mpc5200_gpio_ids[] __initdata = {
 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 

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