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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a1d0d98daf
Add a platform for the Wire Speed Processor, based on the PPC A2. This includes code for the ICS & OPB interrupt controllers, as well as a SCOM backend, and SCOM based cpu bringup. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Jack Miller <jack@codezen.org> Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
/*
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* Copyright 2008-2011, IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/of.h>
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#include <linux/smp.h>
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#include <asm/machdep.h>
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#include <asm/system.h>
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#include <asm/time.h>
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#include <asm/udbg.h>
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#include "ics.h"
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#include "wsp.h"
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static void psr2_spin(void)
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{
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hard_irq_disable();
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for (;;) ;
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}
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static void psr2_restart(char *cmd)
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{
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psr2_spin();
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}
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static int psr2_probe_devices(void)
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{
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struct device_node *np;
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/* Our RTC is a ds1500. It seems to be programatically compatible
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* with the ds1511 for which we have a driver so let's use that
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*/
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np = of_find_compatible_node(NULL, NULL, "dallas,ds1500");
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if (np != NULL) {
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struct resource res;
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if (of_address_to_resource(np, 0, &res) == 0)
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platform_device_register_simple("ds1511", 0, &res, 1);
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}
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return 0;
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}
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machine_arch_initcall(psr2_md, psr2_probe_devices);
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static void __init psr2_setup_arch(void)
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{
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/* init to some ~sane value until calibrate_delay() runs */
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loops_per_jiffy = 50000000;
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scom_init_wsp();
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/* Setup SMP callback */
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#ifdef CONFIG_SMP
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a2_setup_smp();
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#endif
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}
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static int __init psr2_probe(void)
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{
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unsigned long root = of_get_flat_dt_root();
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if (!of_flat_dt_is_compatible(root, "ibm,psr2"))
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return 0;
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return 1;
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}
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static void __init psr2_init_irq(void)
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{
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wsp_init_irq();
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opb_pic_init();
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}
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define_machine(psr2_md) {
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.name = "PSR2 A2",
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.probe = psr2_probe,
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.setup_arch = psr2_setup_arch,
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.restart = psr2_restart,
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.power_off = psr2_spin,
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.halt = psr2_spin,
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.calibrate_decr = generic_calibrate_decr,
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.init_IRQ = psr2_init_irq,
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.progress = udbg_progress,
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.power_save = book3e_idle,
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};
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