summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/powermac/setup.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/platforms/powermac/setup.c')
-rw-r--r--arch/powerpc/platforms/powermac/setup.c608
1 files changed, 608 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c
new file mode 100644
index 000000000..04daa7f0a
--- /dev/null
+++ b/arch/powerpc/platforms/powermac/setup.c
@@ -0,0 +1,608 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Powermac setup and early boot code plus other random bits.
+ *
+ * PowerPC version
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Adapted for Power Macintosh by Paul Mackerras
+ * Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
+ *
+ * Derived from "arch/alpha/kernel/setup.c"
+ * Copyright (C) 1995 Linus Torvalds
+ *
+ * Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
+ */
+
+/*
+ * bootup setup stuff..
+ */
+
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/export.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/bitops.h>
+#include <linux/suspend.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+
+#include <asm/reg.h>
+#include <asm/sections.h>
+#include <asm/io.h>
+#include <asm/pci-bridge.h>
+#include <asm/ohare.h>
+#include <asm/mediabay.h>
+#include <asm/machdep.h>
+#include <asm/dma.h>
+#include <asm/cputable.h>
+#include <asm/btext.h>
+#include <asm/pmac_feature.h>
+#include <asm/time.h>
+#include <asm/mmu_context.h>
+#include <asm/iommu.h>
+#include <asm/smu.h>
+#include <asm/pmc.h>
+#include <asm/udbg.h>
+
+#include "pmac.h"
+
+#undef SHOW_GATWICK_IRQS
+
+int ppc_override_l2cr = 0;
+int ppc_override_l2cr_value;
+int has_l2cache = 0;
+
+int pmac_newworld;
+
+static int current_root_goodness = -1;
+
+#define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
+
+sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
+EXPORT_SYMBOL(sys_ctrler);
+
+static void pmac_show_cpuinfo(struct seq_file *m)
+{
+ struct device_node *np;
+ const char *pp;
+ int plen;
+ int mbmodel;
+ unsigned int mbflags;
+ char* mbname;
+
+ mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
+ PMAC_MB_INFO_MODEL, 0);
+ mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
+ PMAC_MB_INFO_FLAGS, 0);
+ if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
+ (long) &mbname) != 0)
+ mbname = "Unknown";
+
+ /* find motherboard type */
+ seq_printf(m, "machine\t\t: ");
+ np = of_find_node_by_path("/");
+ if (np != NULL) {
+ pp = of_get_property(np, "model", NULL);
+ if (pp != NULL)
+ seq_printf(m, "%s\n", pp);
+ else
+ seq_printf(m, "PowerMac\n");
+ pp = of_get_property(np, "compatible", &plen);
+ if (pp != NULL) {
+ seq_printf(m, "motherboard\t:");
+ while (plen > 0) {
+ int l = strlen(pp) + 1;
+ seq_printf(m, " %s", pp);
+ plen -= l;
+ pp += l;
+ }
+ seq_printf(m, "\n");
+ }
+ of_node_put(np);
+ } else
+ seq_printf(m, "PowerMac\n");
+
+ /* print parsed model */
+ seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
+ seq_printf(m, "pmac flags\t: %08x\n", mbflags);
+
+ /* find l2 cache info */
+ np = of_find_node_by_name(NULL, "l2-cache");
+ if (np == NULL)
+ np = of_find_node_by_type(NULL, "cache");
+ if (np != NULL) {
+ const unsigned int *ic =
+ of_get_property(np, "i-cache-size", NULL);
+ const unsigned int *dc =
+ of_get_property(np, "d-cache-size", NULL);
+ seq_printf(m, "L2 cache\t:");
+ has_l2cache = 1;
+ if (of_get_property(np, "cache-unified", NULL) && dc) {
+ seq_printf(m, " %dK unified", *dc / 1024);
+ } else {
+ if (ic)
+ seq_printf(m, " %dK instruction", *ic / 1024);
+ if (dc)
+ seq_printf(m, "%s %dK data",
+ (ic? " +": ""), *dc / 1024);
+ }
+ pp = of_get_property(np, "ram-type", NULL);
+ if (pp)
+ seq_printf(m, " %s", pp);
+ seq_printf(m, "\n");
+ of_node_put(np);
+ }
+
+ /* Indicate newworld/oldworld */
+ seq_printf(m, "pmac-generation\t: %s\n",
+ pmac_newworld ? "NewWorld" : "OldWorld");
+}
+
+#ifndef CONFIG_ADB_CUDA
+int __init find_via_cuda(void)
+{
+ struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
+
+ if (!dn)
+ return 0;
+ of_node_put(dn);
+ printk("WARNING ! Your machine is CUDA-based but your kernel\n");
+ printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
+ return 0;
+}
+#endif
+
+#ifndef CONFIG_ADB_PMU
+int __init find_via_pmu(void)
+{
+ struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
+
+ if (!dn)
+ return 0;
+ of_node_put(dn);
+ printk("WARNING ! Your machine is PMU-based but your kernel\n");
+ printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
+ return 0;
+}
+#endif
+
+#ifndef CONFIG_PMAC_SMU
+int __init smu_init(void)
+{
+ /* should check and warn if SMU is present */
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_PPC32
+static volatile u32 *sysctrl_regs;
+
+static void __init ohare_init(void)
+{
+ struct device_node *dn;
+
+ /* this area has the CPU identification register
+ and some registers used by smp boards */
+ sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
+
+ /*
+ * Turn on the L2 cache.
+ * We assume that we have a PSX memory controller iff
+ * we have an ohare I/O controller.
+ */
+ dn = of_find_node_by_name(NULL, "ohare");
+ if (dn) {
+ of_node_put(dn);
+ if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
+ if (sysctrl_regs[4] & 0x10)
+ sysctrl_regs[4] |= 0x04000020;
+ else
+ sysctrl_regs[4] |= 0x04000000;
+ if(has_l2cache)
+ printk(KERN_INFO "Level 2 cache enabled\n");
+ }
+ }
+}
+
+static void __init l2cr_init(void)
+{
+ /* Checks "l2cr-value" property in the registry */
+ if (cpu_has_feature(CPU_FTR_L2CR)) {
+ struct device_node *np;
+
+ for_each_of_cpu_node(np) {
+ const unsigned int *l2cr =
+ of_get_property(np, "l2cr-value", NULL);
+ if (l2cr) {
+ ppc_override_l2cr = 1;
+ ppc_override_l2cr_value = *l2cr;
+ _set_L2CR(0);
+ _set_L2CR(ppc_override_l2cr_value);
+ }
+ of_node_put(np);
+ break;
+ }
+ }
+
+ if (ppc_override_l2cr)
+ printk(KERN_INFO "L2CR overridden (0x%x), "
+ "backside cache is %s\n",
+ ppc_override_l2cr_value,
+ (ppc_override_l2cr_value & 0x80000000)
+ ? "enabled" : "disabled");
+}
+#endif
+
+static void __init pmac_setup_arch(void)
+{
+ struct device_node *cpu, *ic;
+ const int *fp;
+ unsigned long pvr;
+
+ pvr = PVR_VER(mfspr(SPRN_PVR));
+
+ /* Set loops_per_jiffy to a half-way reasonable value,
+ for use until calibrate_delay gets called. */
+ loops_per_jiffy = 50000000 / HZ;
+
+ for_each_of_cpu_node(cpu) {
+ fp = of_get_property(cpu, "clock-frequency", NULL);
+ if (fp != NULL) {
+ if (pvr >= 0x30 && pvr < 0x80)
+ /* PPC970 etc. */
+ loops_per_jiffy = *fp / (3 * HZ);
+ else if (pvr == 4 || pvr >= 8)
+ /* 604, G3, G4 etc. */
+ loops_per_jiffy = *fp / HZ;
+ else
+ /* 603, etc. */
+ loops_per_jiffy = *fp / (2 * HZ);
+ of_node_put(cpu);
+ break;
+ }
+ }
+
+ /* See if newworld or oldworld */
+ ic = of_find_node_with_property(NULL, "interrupt-controller");
+ if (ic) {
+ pmac_newworld = 1;
+ of_node_put(ic);
+ }
+
+#ifdef CONFIG_PPC32
+ ohare_init();
+ l2cr_init();
+#endif /* CONFIG_PPC32 */
+
+ find_via_cuda();
+ find_via_pmu();
+ smu_init();
+
+#if IS_ENABLED(CONFIG_NVRAM)
+ pmac_nvram_init();
+#endif
+#ifdef CONFIG_PPC32
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (initrd_start)
+ ROOT_DEV = Root_RAM0;
+ else
+#endif
+ ROOT_DEV = DEFAULT_ROOT_DEVICE;
+#endif
+
+#ifdef CONFIG_ADB
+ if (strstr(boot_command_line, "adb_sync")) {
+ extern int __adb_probe_sync;
+ __adb_probe_sync = 1;
+ }
+#endif /* CONFIG_ADB */
+}
+
+static int initializing = 1;
+
+static int pmac_late_init(void)
+{
+ initializing = 0;
+ return 0;
+}
+machine_late_initcall(powermac, pmac_late_init);
+
+void note_bootable_part(dev_t dev, int part, int goodness);
+/*
+ * This is __ref because we check for "initializing" before
+ * touching any of the __init sensitive things and "initializing"
+ * will be false after __init time. This can't be __init because it
+ * can be called whenever a disk is first accessed.
+ */
+void __ref note_bootable_part(dev_t dev, int part, int goodness)
+{
+ char *p;
+
+ if (!initializing)
+ return;
+ if ((goodness <= current_root_goodness) &&
+ ROOT_DEV != DEFAULT_ROOT_DEVICE)
+ return;
+ p = strstr(boot_command_line, "root=");
+ if (p != NULL && (p == boot_command_line || p[-1] == ' '))
+ return;
+
+ ROOT_DEV = dev + part;
+ current_root_goodness = goodness;
+}
+
+#ifdef CONFIG_ADB_CUDA
+static void __noreturn cuda_restart(void)
+{
+ struct adb_request req;
+
+ cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
+ for (;;)
+ cuda_poll();
+}
+
+static void __noreturn cuda_shutdown(void)
+{
+ struct adb_request req;
+
+ cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
+ for (;;)
+ cuda_poll();
+}
+
+#else
+#define cuda_restart()
+#define cuda_shutdown()
+#endif
+
+#ifndef CONFIG_ADB_PMU
+#define pmu_restart()
+#define pmu_shutdown()
+#endif
+
+#ifndef CONFIG_PMAC_SMU
+#define smu_restart()
+#define smu_shutdown()
+#endif
+
+static void __noreturn pmac_restart(char *cmd)
+{
+ switch (sys_ctrler) {
+ case SYS_CTRLER_CUDA:
+ cuda_restart();
+ break;
+ case SYS_CTRLER_PMU:
+ pmu_restart();
+ break;
+ case SYS_CTRLER_SMU:
+ smu_restart();
+ break;
+ default: ;
+ }
+ while (1) ;
+}
+
+static void __noreturn pmac_power_off(void)
+{
+ switch (sys_ctrler) {
+ case SYS_CTRLER_CUDA:
+ cuda_shutdown();
+ break;
+ case SYS_CTRLER_PMU:
+ pmu_shutdown();
+ break;
+ case SYS_CTRLER_SMU:
+ smu_shutdown();
+ break;
+ default: ;
+ }
+ while (1) ;
+}
+
+static void __noreturn
+pmac_halt(void)
+{
+ pmac_power_off();
+}
+
+/*
+ * Early initialization.
+ */
+static void __init pmac_init(void)
+{
+ /* Enable early btext debug if requested */
+ if (strstr(boot_command_line, "btextdbg")) {
+ udbg_adb_init_early();
+ register_early_udbg_console();
+ }
+
+ /* Probe motherboard chipset */
+ pmac_feature_init();
+
+ /* Initialize debug stuff */
+ udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
+ udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
+
+#ifdef CONFIG_PPC64
+ iommu_init_early_dart(&pmac_pci_controller_ops);
+#endif
+
+ /* SMP Init has to be done early as we need to patch up
+ * cpu_possible_mask before interrupt stacks are allocated
+ * or kaboom...
+ */
+#ifdef CONFIG_SMP
+ pmac_setup_smp();
+#endif
+}
+
+static int __init pmac_declare_of_platform_devices(void)
+{
+ struct device_node *np;
+
+ np = of_find_node_by_name(NULL, "valkyrie");
+ if (np) {
+ of_platform_device_create(np, "valkyrie", NULL);
+ of_node_put(np);
+ }
+ np = of_find_node_by_name(NULL, "platinum");
+ if (np) {
+ of_platform_device_create(np, "platinum", NULL);
+ of_node_put(np);
+ }
+ np = of_find_node_by_type(NULL, "smu");
+ if (np) {
+ of_platform_device_create(np, "smu", NULL);
+ of_node_put(np);
+ }
+ np = of_find_node_by_type(NULL, "fcu");
+ if (np == NULL) {
+ /* Some machines have strangely broken device-tree */
+ np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
+ }
+ if (np) {
+ of_platform_device_create(np, "temperature", NULL);
+ of_node_put(np);
+ }
+
+ return 0;
+}
+machine_device_initcall(powermac, pmac_declare_of_platform_devices);
+
+#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
+/*
+ * This is called very early, as part of console_init() (typically just after
+ * time_init()). This function is respondible for trying to find a good
+ * default console on serial ports. It tries to match the open firmware
+ * default output with one of the available serial console drivers.
+ */
+static int __init check_pmac_serial_console(void)
+{
+ struct device_node *prom_stdout = NULL;
+ int offset = 0;
+ const char *name;
+#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
+ char *devname = "ttyS";
+#else
+ char *devname = "ttyPZ";
+#endif
+
+ pr_debug(" -> check_pmac_serial_console()\n");
+
+ /* The user has requested a console so this is already set up. */
+ if (strstr(boot_command_line, "console=")) {
+ pr_debug(" console was specified !\n");
+ return -EBUSY;
+ }
+
+ if (!of_chosen) {
+ pr_debug(" of_chosen is NULL !\n");
+ return -ENODEV;
+ }
+
+ /* We are getting a weird phandle from OF ... */
+ /* ... So use the full path instead */
+ name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+ if (name == NULL) {
+ pr_debug(" no linux,stdout-path !\n");
+ return -ENODEV;
+ }
+ prom_stdout = of_find_node_by_path(name);
+ if (!prom_stdout) {
+ pr_debug(" can't find stdout package %s !\n", name);
+ return -ENODEV;
+ }
+ pr_debug("stdout is %pOF\n", prom_stdout);
+
+ if (of_node_name_eq(prom_stdout, "ch-a"))
+ offset = 0;
+ else if (of_node_name_eq(prom_stdout, "ch-b"))
+ offset = 1;
+ else
+ goto not_found;
+ of_node_put(prom_stdout);
+
+ pr_debug("Found serial console at %s%d\n", devname, offset);
+
+ return add_preferred_console(devname, offset, NULL);
+
+ not_found:
+ pr_debug("No preferred console found !\n");
+ of_node_put(prom_stdout);
+ return -ENODEV;
+}
+console_initcall(check_pmac_serial_console);
+
+#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
+
+/*
+ * Called very early, MMU is off, device-tree isn't unflattened
+ */
+static int __init pmac_probe(void)
+{
+ if (!of_machine_is_compatible("Power Macintosh") &&
+ !of_machine_is_compatible("MacRISC"))
+ return 0;
+
+#ifdef CONFIG_PPC32
+ /* isa_io_base gets set in pmac_pci_init */
+ DMA_MODE_READ = 1;
+ DMA_MODE_WRITE = 2;
+#endif /* CONFIG_PPC32 */
+
+ pm_power_off = pmac_power_off;
+
+ pmac_init();
+
+ return 1;
+}
+
+define_machine(powermac) {
+ .name = "PowerMac",
+ .probe = pmac_probe,
+ .setup_arch = pmac_setup_arch,
+ .discover_phbs = pmac_pci_init,
+ .show_cpuinfo = pmac_show_cpuinfo,
+ .init_IRQ = pmac_pic_init,
+ .get_irq = NULL, /* changed later */
+ .pci_irq_fixup = pmac_pci_irq_fixup,
+ .restart = pmac_restart,
+ .halt = pmac_halt,
+ .time_init = pmac_time_init,
+ .get_boot_time = pmac_get_boot_time,
+ .set_rtc_time = pmac_set_rtc_time,
+ .get_rtc_time = pmac_get_rtc_time,
+ .calibrate_decr = pmac_calibrate_decr,
+ .feature_call = pmac_do_feature_call,
+ .progress = udbg_progress,
+#ifdef CONFIG_PPC64
+ .power_save = power4_idle,
+ .enable_pmcs = power4_enable_pmcs,
+#endif /* CONFIG_PPC64 */
+#ifdef CONFIG_PPC32
+ .pcibios_after_init = pmac_pcibios_after_init,
+ .phys_mem_access_prot = pci_phys_mem_access_prot,
+#endif
+};