diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/powerpc/platforms/44x/ppc476.c |
Initial import
Diffstat (limited to 'arch/powerpc/platforms/44x/ppc476.c')
-rw-r--r-- | arch/powerpc/platforms/44x/ppc476.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/44x/ppc476.c b/arch/powerpc/platforms/44x/ppc476.c new file mode 100644 index 000000000..c11ce6516 --- /dev/null +++ b/arch/powerpc/platforms/44x/ppc476.c @@ -0,0 +1,299 @@ +/* + * 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 + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/init.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/rtc.h> + +#include <asm/machdep.h> +#include <asm/prom.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 <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 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 avr_reset_system(char *cmd) +{ + avr_halt_system(AVR_PWRCTL_RESET); +} + +static int avr_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + 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", 0 }, + { } +}; + +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, 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_get_property(np, "interrupts", NULL) == NULL) + 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"); +} + +#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 *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 = (u8 *) 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, 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__); + } + } +} + +/* + * Called very early, MMU is off, device-tree isn't unflattened + */ +static int __init ppc47x_probe(void) +{ + unsigned long root = of_get_flat_dt_root(); + + if (of_flat_dt_is_compatible(root, "ibm,akebono")) + return 1; + + if (of_flat_dt_is_compatible(root, "ibm,currituck")) { + ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup; + return 1; + } + + return 0; +} + +define_machine(ppc47x) { + .name = "PowerPC 47x", + .probe = ppc47x_probe, + .progress = udbg_progress, + .init_IRQ = ppc47x_init_irq, + .setup_arch = ppc47x_setup_arch, + .restart = ppc4xx_reset_system, + .calibrate_decr = generic_calibrate_decr, +}; |