diff options
Diffstat (limited to 'arch/powerpc/platforms/maple/setup.c')
| -rw-r--r-- | arch/powerpc/platforms/maple/setup.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/maple/setup.c b/arch/powerpc/platforms/maple/setup.c new file mode 100644 index 000000000..f329a03ed --- /dev/null +++ b/arch/powerpc/platforms/maple/setup.c @@ -0,0 +1,363 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Maple (970 eval board) setup code + * + * (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org), + * IBM Corp. + */ + +#undef DEBUG + +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/mm.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/user.h> +#include <linux/tty.h> +#include <linux/string.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/major.h> +#include <linux/initrd.h> +#include <linux/vt_kern.h> +#include <linux/console.h> +#include <linux/pci.h> +#include <linux/adb.h> +#include <linux/cuda.h> +#include <linux/pmu.h> +#include <linux/irq.h> +#include <linux/seq_file.h> +#include <linux/root_dev.h> +#include <linux/serial.h> +#include <linux/smp.h> +#include <linux/bitops.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/memblock.h> + +#include <asm/processor.h> +#include <asm/sections.h> +#include <asm/io.h> +#include <asm/pci-bridge.h> +#include <asm/iommu.h> +#include <asm/machdep.h> +#include <asm/dma.h> +#include <asm/cputable.h> +#include <asm/time.h> +#include <asm/mpic.h> +#include <asm/rtas.h> +#include <asm/udbg.h> +#include <asm/nvram.h> + +#include "maple.h" + +#ifdef DEBUG +#define DBG(fmt...) udbg_printf(fmt) +#else +#define DBG(fmt...) +#endif + +static unsigned long maple_find_nvram_base(void) +{ + struct device_node *rtcs; + unsigned long result = 0; + + /* find NVRAM device */ + rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111"); + if (rtcs) { + struct resource r; + if (of_address_to_resource(rtcs, 0, &r)) { + printk(KERN_EMERG "Maple: Unable to translate NVRAM" + " address\n"); + goto bail; + } + if (!(r.flags & IORESOURCE_IO)) { + printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n"); + goto bail; + } + result = r.start; + } else + printk(KERN_EMERG "Maple: Unable to find NVRAM\n"); + bail: + of_node_put(rtcs); + return result; +} + +static void __noreturn maple_restart(char *cmd) +{ + unsigned int maple_nvram_base; + const unsigned int *maple_nvram_offset, *maple_nvram_command; + struct device_node *sp; + + maple_nvram_base = maple_find_nvram_base(); + if (maple_nvram_base == 0) + goto fail; + + /* find service processor device */ + sp = of_find_node_by_name(NULL, "service-processor"); + if (!sp) { + printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); + goto fail; + } + maple_nvram_offset = of_get_property(sp, "restart-addr", NULL); + maple_nvram_command = of_get_property(sp, "restart-value", NULL); + of_node_put(sp); + + /* send command */ + outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); + for (;;) ; + fail: + printk(KERN_EMERG "Maple: Manual Restart Required\n"); + for (;;) ; +} + +static void __noreturn maple_power_off(void) +{ + unsigned int maple_nvram_base; + const unsigned int *maple_nvram_offset, *maple_nvram_command; + struct device_node *sp; + + maple_nvram_base = maple_find_nvram_base(); + if (maple_nvram_base == 0) + goto fail; + + /* find service processor device */ + sp = of_find_node_by_name(NULL, "service-processor"); + if (!sp) { + printk(KERN_EMERG "Maple: Unable to find Service Processor\n"); + goto fail; + } + maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL); + maple_nvram_command = of_get_property(sp, "power-off-value", NULL); + of_node_put(sp); + + /* send command */ + outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset); + for (;;) ; + fail: + printk(KERN_EMERG "Maple: Manual Power-Down Required\n"); + for (;;) ; +} + +static void __noreturn maple_halt(void) +{ + maple_power_off(); +} + +#ifdef CONFIG_SMP +static struct smp_ops_t maple_smp_ops = { + .probe = smp_mpic_probe, + .message_pass = smp_mpic_message_pass, + .kick_cpu = smp_generic_kick_cpu, + .setup_cpu = smp_mpic_setup_cpu, + .give_timebase = smp_generic_give_timebase, + .take_timebase = smp_generic_take_timebase, +}; +#endif /* CONFIG_SMP */ + +static void __init maple_use_rtas_reboot_and_halt_if_present(void) +{ + if (rtas_function_implemented(RTAS_FN_SYSTEM_REBOOT) && + rtas_function_implemented(RTAS_FN_POWER_OFF)) { + ppc_md.restart = rtas_restart; + pm_power_off = rtas_power_off; + ppc_md.halt = rtas_halt; + } +} + +static void __init maple_setup_arch(void) +{ + /* init to some ~sane value until calibrate_delay() runs */ + loops_per_jiffy = 50000000; + + /* Setup SMP callback */ +#ifdef CONFIG_SMP + smp_ops = &maple_smp_ops; +#endif + maple_use_rtas_reboot_and_halt_if_present(); + + printk(KERN_DEBUG "Using native/NAP idle loop\n"); + + mmio_nvram_init(); +} + +/* + * This is almost identical to pSeries and CHRP. We need to make that + * code generic at one point, with appropriate bits in the device-tree to + * identify the presence of an HT APIC + */ +static void __init maple_init_IRQ(void) +{ + struct device_node *root, *np, *mpic_node = NULL; + const unsigned int *opprop; + unsigned long openpic_addr = 0; + int naddr, n, i, opplen, has_isus = 0; + struct mpic *mpic; + unsigned int flags = 0; + + /* Locate MPIC in the device-tree. Note that there is a bug + * in Maple device-tree where the type of the controller is + * open-pic and not interrupt-controller + */ + + for_each_node_by_type(np, "interrupt-controller") + if (of_device_is_compatible(np, "open-pic")) { + mpic_node = np; + break; + } + if (mpic_node == NULL) + for_each_node_by_type(np, "open-pic") { + mpic_node = np; + break; + } + if (mpic_node == NULL) { + printk(KERN_ERR + "Failed to locate the MPIC interrupt controller\n"); + return; + } + + /* Find address list in /platform-open-pic */ + root = of_find_node_by_path("/"); + naddr = of_n_addr_cells(root); + opprop = of_get_property(root, "platform-open-pic", &opplen); + if (opprop) { + openpic_addr = of_read_number(opprop, naddr); + has_isus = (opplen > naddr); + printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n", + openpic_addr, has_isus); + } + + BUG_ON(openpic_addr == 0); + + /* Check for a big endian MPIC */ + if (of_property_read_bool(np, "big-endian")) + flags |= MPIC_BIG_ENDIAN; + + /* XXX Maple specific bits */ + flags |= MPIC_U3_HT_IRQS; + /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */ + flags |= MPIC_BIG_ENDIAN; + + /* Setup the openpic driver. More device-tree junks, we hard code no + * ISUs for now. I'll have to revisit some stuffs with the folks doing + * the firmware for those + */ + mpic = mpic_alloc(mpic_node, openpic_addr, flags, + /*has_isus ? 16 :*/ 0, 0, " MPIC "); + BUG_ON(mpic == NULL); + + /* Add ISUs */ + opplen /= sizeof(u32); + for (n = 0, i = naddr; i < opplen; i += naddr, n++) { + unsigned long isuaddr = of_read_number(opprop + i, naddr); + mpic_assign_isu(mpic, n, isuaddr); + } + + /* All ISUs are setup, complete initialization */ + mpic_init(mpic); + ppc_md.get_irq = mpic_get_irq; + of_node_put(mpic_node); + of_node_put(root); +} + +static void __init maple_progress(char *s, unsigned short hex) +{ + printk("*** %04x : %s\n", hex, s ? s : ""); +} + + +/* + * Called very early, MMU is off, device-tree isn't unflattened + */ +static int __init maple_probe(void) +{ + if (!of_machine_is_compatible("Momentum,Maple") && + !of_machine_is_compatible("Momentum,Apache")) + return 0; + + pm_power_off = maple_power_off; + + iommu_init_early_dart(&maple_pci_controller_ops); + + return 1; +} + +#ifdef CONFIG_EDAC +/* + * Register a platform device for CPC925 memory controller on + * all boards with U3H (CPC925) bridge. + */ +static int __init maple_cpc925_edac_setup(void) +{ + struct platform_device *pdev; + struct device_node *np = NULL; + struct resource r; + int ret; + volatile void __iomem *mem; + u32 rev; + + np = of_find_node_by_type(NULL, "memory-controller"); + if (!np) { + printk(KERN_ERR "%s: Unable to find memory-controller node\n", + __func__); + return -ENODEV; + } + + ret = of_address_to_resource(np, 0, &r); + of_node_put(np); + + if (ret < 0) { + printk(KERN_ERR "%s: Unable to get memory-controller reg\n", + __func__); + return -ENODEV; + } + + mem = ioremap(r.start, resource_size(&r)); + if (!mem) { + printk(KERN_ERR "%s: Unable to map memory-controller memory\n", + __func__); + return -ENOMEM; + } + + rev = __raw_readl(mem); + iounmap(mem); + + if (rev < 0x34 || rev > 0x3f) { /* U3H */ + printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n", + __func__, rev); + return 0; + } + + pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1); + if (IS_ERR(pdev)) + return PTR_ERR(pdev); + + printk(KERN_INFO "%s: CPC925 platform device created\n", __func__); + + return 0; +} +machine_device_initcall(maple, maple_cpc925_edac_setup); +#endif + +define_machine(maple) { + .name = "Maple", + .probe = maple_probe, + .setup_arch = maple_setup_arch, + .discover_phbs = maple_pci_init, + .init_IRQ = maple_init_IRQ, + .pci_irq_fixup = maple_pci_irq_fixup, + .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq, + .restart = maple_restart, + .halt = maple_halt, + .get_boot_time = maple_get_boot_time, + .set_rtc_time = maple_set_rtc_time, + .get_rtc_time = maple_get_rtc_time, + .progress = maple_progress, + .power_save = power4_idle, +}; |