ee983079ce
Low-power mode implementation for Lite5200b. Some I/O registers are also saved here. A recent U-Boot that supports this (lite5200b_PM_config) is needed. Signed-off-by: Domen Puncer <domen.puncer@telargo.com> Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
192 lines
4.5 KiB
C
192 lines
4.5 KiB
C
/*
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* Freescale Lite5200 board support
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*
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* Written by: Grant Likely <grant.likely@secretlab.ca>
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*
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* Copyright (C) Secret Lab Technologies Ltd. 2006. All rights reserved.
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* Copyright (C) Freescale Semicondutor, Inc. 2006. All rights reserved.
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*
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* Description:
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#undef DEBUG
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/reboot.h>
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#include <linux/pci.h>
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#include <linux/kdev_t.h>
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#include <linux/major.h>
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#include <linux/console.h>
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#include <linux/delay.h>
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#include <linux/seq_file.h>
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#include <linux/root_dev.h>
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#include <linux/initrd.h>
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#include <asm/system.h>
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#include <asm/atomic.h>
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#include <asm/time.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#include <asm/ipic.h>
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#include <asm/irq.h>
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#include <asm/prom.h>
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#include <asm/udbg.h>
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#include <sysdev/fsl_soc.h>
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#include <asm/of_platform.h>
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#include <asm/mpc52xx.h>
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/* ************************************************************************
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*
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* Setup the architecture
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*
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*/
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static void __init
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lite5200_setup_cpu(void)
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{
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struct mpc52xx_gpio __iomem *gpio;
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u32 port_config;
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/* Map zones */
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gpio = mpc52xx_find_and_map("mpc5200-gpio");
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if (!gpio) {
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printk(KERN_ERR __FILE__ ": "
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"Error while mapping GPIO register for port config. "
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"Expect some abnormal behavior\n");
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goto error;
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}
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/* Set port config */
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port_config = in_be32(&gpio->port_config);
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port_config &= ~0x00800000; /* 48Mhz internal, pin is GPIO */
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port_config &= ~0x00007000; /* USB port : Differential mode */
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port_config |= 0x00001000; /* USB 1 only */
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port_config &= ~0x03000000; /* ATA CS is on csb_4/5 */
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port_config |= 0x01000000;
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pr_debug("port_config: old:%x new:%x\n",
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in_be32(&gpio->port_config), port_config);
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out_be32(&gpio->port_config, port_config);
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/* Unmap zone */
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error:
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iounmap(gpio);
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}
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#ifdef CONFIG_PM
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static void lite5200_suspend_prepare(void __iomem *mbar)
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{
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u8 pin = 1; /* GPIO_WKUP_1 (GPIO_PSC2_4) */
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u8 level = 0; /* wakeup on low level */
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mpc52xx_set_wakeup_gpio(pin, level);
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/*
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* power down usb port
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* this needs to be called before of-ohci suspend code
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*/
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/* set ports to "power switched" and "powered at the same time"
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* USB Rh descriptor A: NPS = 0, PSM = 0 */
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out_be32(mbar + 0x1048, in_be32(mbar + 0x1048) & ~0x300);
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/* USB Rh status: LPS = 1 - turn off power */
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out_be32(mbar + 0x1050, 0x00000001);
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}
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static void lite5200_resume_finish(void __iomem *mbar)
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{
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/* USB Rh status: LPSC = 1 - turn on power */
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out_be32(mbar + 0x1050, 0x00010000);
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}
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#endif
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static void __init lite5200_setup_arch(void)
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{
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#ifdef CONFIG_PCI
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struct device_node *np;
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#endif
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if (ppc_md.progress)
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ppc_md.progress("lite5200_setup_arch()", 0);
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/* CPU & Port mux setup */
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mpc52xx_setup_cpu(); /* Generic */
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lite5200_setup_cpu(); /* Platorm specific */
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#ifdef CONFIG_PM
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mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
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mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
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lite5200_pm_init();
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#endif
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#ifdef CONFIG_PCI
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np = of_find_node_by_type(NULL, "pci");
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if (np) {
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mpc52xx_add_bridge(np);
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of_node_put(np);
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}
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start)
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ROOT_DEV = Root_RAM0;
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else
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#endif
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#ifdef CONFIG_ROOT_NFS
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ROOT_DEV = Root_NFS;
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#else
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ROOT_DEV = Root_HDA1;
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#endif
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}
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static void lite5200_show_cpuinfo(struct seq_file *m)
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{
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struct device_node* np = of_find_all_nodes(NULL);
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const char *model = NULL;
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if (np)
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model = of_get_property(np, "model", NULL);
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seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
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seq_printf(m, "machine\t\t: %s\n", model ? model : "unknown");
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of_node_put(np);
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}
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/*
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* Called very early, MMU is off, device-tree isn't unflattened
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*/
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static int __init lite5200_probe(void)
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{
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unsigned long node = of_get_flat_dt_root();
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const char *model = of_get_flat_dt_prop(node, "model", NULL);
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if (!of_flat_dt_is_compatible(node, "fsl,lite5200") &&
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!of_flat_dt_is_compatible(node, "fsl,lite5200b"))
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return 0;
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pr_debug("%s board found\n", model ? model : "unknown");
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return 1;
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}
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define_machine(lite5200) {
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.name = "lite5200",
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.probe = lite5200_probe,
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.setup_arch = lite5200_setup_arch,
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.init = mpc52xx_declare_of_platform_devices,
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.init_IRQ = mpc52xx_init_irq,
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.get_irq = mpc52xx_get_irq,
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.show_cpuinfo = lite5200_show_cpuinfo,
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.calibrate_decr = generic_calibrate_decr,
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};
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