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293 lines
7.1 KiB
293 lines
7.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* PowerPC 476FPE board specific routines |
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* |
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* Copyright © 2013 Tony Breeds IBM Corporation |
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* Copyright © 2013 Alistair Popple IBM Corporation |
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* |
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* Based on earlier code: |
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* Matt Porter <[email protected]> |
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* Copyright 2002-2005 MontaVista Software Inc. |
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* |
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* Eugene Surovegin <[email protected]> or <[email protected]> |
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* Copyright (c) 2003-2005 Zultys Technologies |
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* |
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* Rewritten and ported to the merged powerpc tree: |
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* Copyright 2007 David Gibson <[email protected]>, IBM Corporation. |
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* Copyright © 2011 David Kliekamp IBM Corporation |
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*/ |
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#include <linux/init.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/rtc.h> |
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#include <asm/machdep.h> |
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#include <asm/prom.h> |
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#include <asm/udbg.h> |
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#include <asm/time.h> |
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#include <asm/uic.h> |
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#include <asm/ppc4xx.h> |
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#include <asm/mpic.h> |
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#include <asm/mmu.h> |
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#include <asm/swiotlb.h> |
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#include <linux/pci.h> |
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#include <linux/i2c.h> |
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static const struct of_device_id ppc47x_of_bus[] __initconst = { |
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{ .compatible = "ibm,plb4", }, |
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{ .compatible = "ibm,plb6", }, |
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{ .compatible = "ibm,opb", }, |
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{ .compatible = "ibm,ebc", }, |
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{}, |
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}; |
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/* The EEPROM is missing and the default values are bogus. This forces USB in |
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* to EHCI mode */ |
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static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev) |
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{ |
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if (of_machine_is_compatible("ibm,currituck")) { |
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pci_write_config_dword(dev, 0xe0, 0x0114231f); |
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pci_write_config_dword(dev, 0xe4, 0x00006c40); |
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} |
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} |
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DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup); |
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/* Akebono has an AVR microcontroller attached to the I2C bus |
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* which is used to power off/reset the system. */ |
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/* AVR I2C Commands */ |
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#define AVR_PWRCTL_CMD (0x26) |
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/* Flags for the power control I2C commands */ |
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#define AVR_PWRCTL_PWROFF (0x01) |
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#define AVR_PWRCTL_RESET (0x02) |
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static struct i2c_client *avr_i2c_client; |
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static void __noreturn avr_halt_system(int pwrctl_flags) |
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{ |
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/* Request the AVR to reset the system */ |
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i2c_smbus_write_byte_data(avr_i2c_client, |
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AVR_PWRCTL_CMD, pwrctl_flags); |
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/* Wait for system to be reset */ |
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while (1) |
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; |
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} |
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static void avr_power_off_system(void) |
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{ |
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avr_halt_system(AVR_PWRCTL_PWROFF); |
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} |
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static void __noreturn avr_reset_system(char *cmd) |
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{ |
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avr_halt_system(AVR_PWRCTL_RESET); |
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} |
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static int avr_probe(struct i2c_client *client) |
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{ |
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avr_i2c_client = client; |
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ppc_md.restart = avr_reset_system; |
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pm_power_off = avr_power_off_system; |
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return 0; |
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} |
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static const struct i2c_device_id avr_id[] = { |
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{ "akebono-avr", 0 }, |
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{ } |
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}; |
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static struct i2c_driver avr_driver = { |
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.driver = { |
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.name = "akebono-avr", |
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}, |
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.probe_new = avr_probe, |
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.id_table = avr_id, |
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}; |
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static int __init ppc47x_device_probe(void) |
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{ |
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i2c_add_driver(&avr_driver); |
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of_platform_bus_probe(NULL, ppc47x_of_bus, NULL); |
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return 0; |
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} |
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machine_device_initcall(ppc47x, ppc47x_device_probe); |
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static void __init ppc47x_init_irq(void) |
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{ |
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struct device_node *np; |
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/* Find top level interrupt controller */ |
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for_each_node_with_property(np, "interrupt-controller") { |
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if (of_get_property(np, "interrupts", NULL) == NULL) |
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break; |
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} |
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if (np == NULL) |
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panic("Can't find top level interrupt controller"); |
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/* Check type and do appropriate initialization */ |
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if (of_device_is_compatible(np, "chrp,open-pic")) { |
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/* The MPIC driver will get everything it needs from the |
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* device-tree, just pass 0 to all arguments |
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*/ |
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struct mpic *mpic = |
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mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC "); |
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BUG_ON(mpic == NULL); |
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mpic_init(mpic); |
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ppc_md.get_irq = mpic_get_irq; |
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} else |
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panic("Unrecognized top level interrupt controller"); |
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} |
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#ifdef CONFIG_SMP |
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static void smp_ppc47x_setup_cpu(int cpu) |
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{ |
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mpic_setup_this_cpu(); |
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} |
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static int smp_ppc47x_kick_cpu(int cpu) |
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{ |
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struct device_node *cpunode = of_get_cpu_node(cpu, NULL); |
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const u64 *spin_table_addr_prop; |
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u32 *spin_table; |
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extern void start_secondary_47x(void); |
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BUG_ON(cpunode == NULL); |
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/* Assume spin table. We could test for the enable-method in |
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* the device-tree but currently there's little point as it's |
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* our only supported method |
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*/ |
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spin_table_addr_prop = |
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of_get_property(cpunode, "cpu-release-addr", NULL); |
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if (spin_table_addr_prop == NULL) { |
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pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", |
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cpu); |
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return 1; |
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} |
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/* Assume it's mapped as part of the linear mapping. This is a bit |
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* fishy but will work fine for now |
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* |
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* XXX: Is there any reason to assume differently? |
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*/ |
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spin_table = (u32 *)__va(*spin_table_addr_prop); |
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pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table); |
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spin_table[3] = cpu; |
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smp_wmb(); |
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spin_table[1] = __pa(start_secondary_47x); |
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mb(); |
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return 0; |
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} |
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static struct smp_ops_t ppc47x_smp_ops = { |
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.probe = smp_mpic_probe, |
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.message_pass = smp_mpic_message_pass, |
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.setup_cpu = smp_ppc47x_setup_cpu, |
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.kick_cpu = smp_ppc47x_kick_cpu, |
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.give_timebase = smp_generic_give_timebase, |
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.take_timebase = smp_generic_take_timebase, |
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}; |
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static void __init ppc47x_smp_init(void) |
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{ |
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if (mmu_has_feature(MMU_FTR_TYPE_47x)) |
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smp_ops = &ppc47x_smp_ops; |
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} |
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#else /* CONFIG_SMP */ |
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static void __init ppc47x_smp_init(void) { } |
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#endif /* CONFIG_SMP */ |
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static void __init ppc47x_setup_arch(void) |
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{ |
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/* No need to check the DMA config as we /know/ our windows are all of |
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* RAM. Lets hope that doesn't change */ |
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swiotlb_detect_4g(); |
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ppc47x_smp_init(); |
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} |
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static int board_rev = -1; |
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static int __init ppc47x_get_board_rev(void) |
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{ |
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int reg; |
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u8 *fpga; |
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struct device_node *np = NULL; |
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if (of_machine_is_compatible("ibm,currituck")) { |
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np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga"); |
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reg = 0; |
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} else if (of_machine_is_compatible("ibm,akebono")) { |
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np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga"); |
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reg = 2; |
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} |
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if (!np) |
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goto fail; |
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fpga = (u8 *) of_iomap(np, 0); |
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of_node_put(np); |
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if (!fpga) |
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goto fail; |
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board_rev = ioread8(fpga + reg) & 0x03; |
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pr_info("%s: Found board revision %d\n", __func__, board_rev); |
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iounmap(fpga); |
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return 0; |
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fail: |
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pr_info("%s: Unable to find board revision\n", __func__); |
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return 0; |
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} |
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machine_arch_initcall(ppc47x, ppc47x_get_board_rev); |
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/* Use USB controller should have been hardware swizzled but it wasn't :( */ |
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static void ppc47x_pci_irq_fixup(struct pci_dev *dev) |
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{ |
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if (dev->vendor == 0x1033 && (dev->device == 0x0035 || |
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dev->device == 0x00e0)) { |
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if (board_rev == 0) { |
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dev->irq = irq_create_mapping(NULL, 47); |
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pr_info("%s: Mapping irq %d\n", __func__, dev->irq); |
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} else if (board_rev == 2) { |
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dev->irq = irq_create_mapping(NULL, 49); |
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pr_info("%s: Mapping irq %d\n", __func__, dev->irq); |
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} else { |
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pr_alert("%s: Unknown board revision\n", __func__); |
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} |
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} |
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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 ppc47x_probe(void) |
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{ |
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if (of_machine_is_compatible("ibm,akebono")) |
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return 1; |
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if (of_machine_is_compatible("ibm,currituck")) { |
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ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup; |
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return 1; |
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} |
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return 0; |
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} |
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define_machine(ppc47x) { |
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.name = "PowerPC 47x", |
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.probe = ppc47x_probe, |
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.progress = udbg_progress, |
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.init_IRQ = ppc47x_init_irq, |
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.setup_arch = ppc47x_setup_arch, |
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.restart = ppc4xx_reset_system, |
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.calibrate_decr = generic_calibrate_decr, |
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};
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