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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PowerPC 476FPE board specific routines
*
* Copyright © 2013 Tony Breeds IBM Corporation
* Copyright © 2013 Alistair Popple IBM Corporation
*
* Based on earlier code:
* Matt Porter <mporter@kernel.crashing.org>
* Copyright 2002-2005 MontaVista Software Inc.
*
* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
* Copyright (c) 2003-2005 Zultys Technologies
*
* Rewritten and ported to the merged powerpc tree:
* Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
* Copyright © 2011 David Kliekamp IBM Corporation
*/
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/rtc.h>
#include <asm/machdep.h>
#include <asm/udbg.h>
#include <asm/time.h>
#include <asm/uic.h>
#include <asm/ppc4xx.h>
#include <asm/mpic.h>
#include <asm/mmu.h>
#include <asm/swiotlb.h>
#include <linux/pci.h>
#include <linux/i2c.h>
static const struct of_device_id ppc47x_of_bus[] __initconst = {
{ .compatible = "ibm,plb4", },
{ .compatible = "ibm,plb6", },
{ .compatible = "ibm,opb", },
{ .compatible = "ibm,ebc", },
{},
};
/* The EEPROM is missing and the default values are bogus. This forces USB in
* to EHCI mode */
static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
{
if (of_machine_is_compatible("ibm,currituck")) {
pci_write_config_dword(dev, 0xe0, 0x0114231f);
pci_write_config_dword(dev, 0xe4, 0x00006c40);
}
}
DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
/* Akebono has an AVR microcontroller attached to the I2C bus
* which is used to power off/reset the system. */
/* AVR I2C Commands */
#define AVR_PWRCTL_CMD (0x26)
/* Flags for the power control I2C commands */
#define AVR_PWRCTL_PWROFF (0x01)
#define AVR_PWRCTL_RESET (0x02)
static struct i2c_client *avr_i2c_client;
static void __noreturn avr_halt_system(int pwrctl_flags)
{
/* Request the AVR to reset the system */
i2c_smbus_write_byte_data(avr_i2c_client,
AVR_PWRCTL_CMD, pwrctl_flags);
/* Wait for system to be reset */
while (1)
;
}
static void avr_power_off_system(void)
{
avr_halt_system(AVR_PWRCTL_PWROFF);
}
static void __noreturn avr_reset_system(char *cmd)
{
avr_halt_system(AVR_PWRCTL_RESET);
}
static int avr_probe(struct i2c_client *client)
{
avr_i2c_client = client;
ppc_md.restart = avr_reset_system;
pm_power_off = avr_power_off_system;
return 0;
}
static const struct i2c_device_id avr_id[] = {
{ "akebono-avr" },
{ }
};
static struct i2c_driver avr_driver = {
.driver = {
.name = "akebono-avr",
},
.probe = avr_probe,
.id_table = avr_id,
};
static int __init ppc47x_device_probe(void)
{
i2c_add_driver(&avr_driver);
of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
return 0;
}
machine_device_initcall(ppc47x_akebono, ppc47x_device_probe);
machine_device_initcall(ppc47x_currituck, ppc47x_device_probe);
static void __init ppc47x_init_irq(void)
{
struct device_node *np;
/* Find top level interrupt controller */
for_each_node_with_property(np, "interrupt-controller") {
if (!of_property_present(np, "interrupts"))
break;
}
if (np == NULL)
panic("Can't find top level interrupt controller");
/* Check type and do appropriate initialization */
if (of_device_is_compatible(np, "chrp,open-pic")) {
/* The MPIC driver will get everything it needs from the
* device-tree, just pass 0 to all arguments
*/
struct mpic *mpic =
mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC ");
BUG_ON(mpic == NULL);
mpic_init(mpic);
ppc_md.get_irq = mpic_get_irq;
} else
panic("Unrecognized top level interrupt controller");
of_node_put(np);
}
#ifdef CONFIG_SMP
static void smp_ppc47x_setup_cpu(int cpu)
{
mpic_setup_this_cpu();
}
static int smp_ppc47x_kick_cpu(int cpu)
{
struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
const u64 *spin_table_addr_prop;
u32 *spin_table;
extern void start_secondary_47x(void);
BUG_ON(cpunode == NULL);
/* Assume spin table. We could test for the enable-method in
* the device-tree but currently there's little point as it's
* our only supported method
*/
spin_table_addr_prop =
of_get_property(cpunode, "cpu-release-addr", NULL);
if (spin_table_addr_prop == NULL) {
pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
cpu);
return 1;
}
/* Assume it's mapped as part of the linear mapping. This is a bit
* fishy but will work fine for now
*
* XXX: Is there any reason to assume differently?
*/
spin_table = (u32 *)__va(*spin_table_addr_prop);
pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
spin_table[3] = cpu;
smp_wmb();
spin_table[1] = __pa(start_secondary_47x);
mb();
return 0;
}
static struct smp_ops_t ppc47x_smp_ops = {
.probe = smp_mpic_probe,
.message_pass = smp_mpic_message_pass,
.setup_cpu = smp_ppc47x_setup_cpu,
.kick_cpu = smp_ppc47x_kick_cpu,
.give_timebase = smp_generic_give_timebase,
.take_timebase = smp_generic_take_timebase,
};
static void __init ppc47x_smp_init(void)
{
if (mmu_has_feature(MMU_FTR_TYPE_47x))
smp_ops = &ppc47x_smp_ops;
}
#else /* CONFIG_SMP */
static void __init ppc47x_smp_init(void) { }
#endif /* CONFIG_SMP */
static void __init ppc47x_setup_arch(void)
{
/* No need to check the DMA config as we /know/ our windows are all of
* RAM. Lets hope that doesn't change */
swiotlb_detect_4g();
ppc47x_smp_init();
}
static int board_rev = -1;
static int __init ppc47x_get_board_rev(void)
{
int reg;
u8 __iomem *fpga;
struct device_node *np = NULL;
if (of_machine_is_compatible("ibm,currituck")) {
np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga");
reg = 0;
} else if (of_machine_is_compatible("ibm,akebono")) {
np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga");
reg = 2;
}
if (!np)
goto fail;
fpga = of_iomap(np, 0);
of_node_put(np);
if (!fpga)
goto fail;
board_rev = ioread8(fpga + reg) & 0x03;
pr_info("%s: Found board revision %d\n", __func__, board_rev);
iounmap(fpga);
return 0;
fail:
pr_info("%s: Unable to find board revision\n", __func__);
return 0;
}
machine_arch_initcall(ppc47x_akebono, ppc47x_get_board_rev);
machine_arch_initcall(ppc47x_currituck, ppc47x_get_board_rev);
/* Use USB controller should have been hardware swizzled but it wasn't :( */
static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
{
if (dev->vendor == 0x1033 && (dev->device == 0x0035 ||
dev->device == 0x00e0)) {
if (board_rev == 0) {
dev->irq = irq_create_mapping(NULL, 47);
pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
} else if (board_rev == 2) {
dev->irq = irq_create_mapping(NULL, 49);
pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
} else {
pr_alert("%s: Unknown board revision\n", __func__);
}
}
}
define_machine(ppc47x_akebono) {
.name = "PowerPC 47x (akebono)",
.compatible = "ibm,akebono",
.progress = udbg_progress,
.init_IRQ = ppc47x_init_irq,
.setup_arch = ppc47x_setup_arch,
.restart = ppc4xx_reset_system,
};
define_machine(ppc47x_currituck) {
.name = "PowerPC 47x (currituck)",
.compatible = "ibm,currituck",
.progress = udbg_progress,
.init_IRQ = ppc47x_init_irq,
.pci_irq_fixup = ppc47x_pci_irq_fixup,
.setup_arch = ppc47x_setup_arch,
.restart = ppc4xx_reset_system,
};
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