Arnd Bergmann | c902be7 | 2006-01-04 19:55:53 +0000 | [diff] [blame] | 1 | /* |
| 2 | * CBE Pervasive Monitor and Debug |
| 3 | * |
| 4 | * (C) Copyright IBM Corporation 2005 |
| 5 | * |
| 6 | * Authors: Maximino Aguilar (maguilar@us.ibm.com) |
| 7 | * Michael N. Day (mnday@us.ibm.com) |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2, or (at your option) |
| 12 | * any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 | */ |
| 23 | |
| 24 | #undef DEBUG |
| 25 | |
| 26 | #include <linux/config.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/irq.h> |
| 29 | #include <linux/percpu.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/kallsyms.h> |
| 32 | |
| 33 | #include <asm/io.h> |
| 34 | #include <asm/machdep.h> |
| 35 | #include <asm/prom.h> |
| 36 | #include <asm/pgtable.h> |
| 37 | #include <asm/reg.h> |
| 38 | |
| 39 | #include "pervasive.h" |
| 40 | |
| 41 | static DEFINE_SPINLOCK(cbe_pervasive_lock); |
| 42 | struct cbe_pervasive { |
| 43 | struct pmd_regs __iomem *regs; |
| 44 | unsigned int thread; |
| 45 | }; |
| 46 | |
| 47 | /* can't use per_cpu from setup_arch */ |
| 48 | static struct cbe_pervasive cbe_pervasive[NR_CPUS]; |
| 49 | |
| 50 | static void __init cbe_enable_pause_zero(void) |
| 51 | { |
| 52 | unsigned long thread_switch_control; |
| 53 | unsigned long temp_register; |
| 54 | struct cbe_pervasive *p; |
| 55 | int thread; |
| 56 | |
| 57 | spin_lock_irq(&cbe_pervasive_lock); |
| 58 | p = &cbe_pervasive[smp_processor_id()]; |
| 59 | |
| 60 | if (!cbe_pervasive->regs) |
| 61 | goto out; |
| 62 | |
| 63 | pr_debug("Power Management: CPU %d\n", smp_processor_id()); |
| 64 | |
| 65 | /* Enable Pause(0) control bit */ |
| 66 | temp_register = in_be64(&p->regs->pm_control); |
| 67 | |
| 68 | out_be64(&p->regs->pm_control, |
| 69 | temp_register|PMD_PAUSE_ZERO_CONTROL); |
| 70 | |
| 71 | /* Enable DEC and EE interrupt request */ |
| 72 | thread_switch_control = mfspr(SPRN_TSC_CELL); |
| 73 | thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST; |
| 74 | |
| 75 | switch ((mfspr(SPRN_CTRLF) & CTRL_CT)) { |
| 76 | case CTRL_CT0: |
| 77 | thread_switch_control |= TSC_CELL_DEC_ENABLE_0; |
| 78 | thread = 0; |
| 79 | break; |
| 80 | case CTRL_CT1: |
| 81 | thread_switch_control |= TSC_CELL_DEC_ENABLE_1; |
| 82 | thread = 1; |
| 83 | break; |
| 84 | default: |
| 85 | printk(KERN_WARNING "%s: unknown configuration\n", |
| 86 | __FUNCTION__); |
| 87 | thread = -1; |
| 88 | break; |
| 89 | } |
| 90 | |
| 91 | if (p->thread != thread) |
| 92 | printk(KERN_WARNING "%s: device tree inconsistant, " |
| 93 | "cpu %i: %d/%d\n", __FUNCTION__, |
| 94 | smp_processor_id(), |
| 95 | p->thread, thread); |
| 96 | |
| 97 | mtspr(SPRN_TSC_CELL, thread_switch_control); |
| 98 | |
| 99 | out: |
| 100 | spin_unlock_irq(&cbe_pervasive_lock); |
| 101 | } |
| 102 | |
| 103 | static void cbe_idle(void) |
| 104 | { |
| 105 | unsigned long ctrl; |
| 106 | |
| 107 | cbe_enable_pause_zero(); |
| 108 | |
| 109 | while (1) { |
| 110 | if (!need_resched()) { |
| 111 | local_irq_disable(); |
| 112 | while (!need_resched()) { |
| 113 | /* go into low thread priority */ |
| 114 | HMT_low(); |
| 115 | |
| 116 | /* |
| 117 | * atomically disable thread execution |
| 118 | * and runlatch. |
| 119 | * External and Decrementer exceptions |
| 120 | * are still handled when the thread |
| 121 | * is disabled but now enter in |
| 122 | * cbe_system_reset_exception() |
| 123 | */ |
| 124 | ctrl = mfspr(SPRN_CTRLF); |
| 125 | ctrl &= ~(CTRL_RUNLATCH | CTRL_TE); |
| 126 | mtspr(SPRN_CTRLT, ctrl); |
| 127 | } |
| 128 | /* restore thread prio */ |
| 129 | HMT_medium(); |
| 130 | local_irq_enable(); |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * turn runlatch on again before scheduling the |
| 135 | * process we just woke up |
| 136 | */ |
| 137 | ppc64_runlatch_on(); |
| 138 | |
| 139 | preempt_enable_no_resched(); |
| 140 | schedule(); |
| 141 | preempt_disable(); |
| 142 | } |
| 143 | } |
| 144 | |
Arnd Bergmann | 8fce10a | 2006-01-11 23:07:11 +0000 | [diff] [blame] | 145 | static int cbe_system_reset_exception(struct pt_regs *regs) |
Arnd Bergmann | c902be7 | 2006-01-04 19:55:53 +0000 | [diff] [blame] | 146 | { |
| 147 | switch (regs->msr & SRR1_WAKEMASK) { |
| 148 | case SRR1_WAKEEE: |
| 149 | do_IRQ(regs); |
| 150 | break; |
| 151 | case SRR1_WAKEDEC: |
| 152 | timer_interrupt(regs); |
| 153 | break; |
| 154 | case SRR1_WAKEMT: |
| 155 | /* no action required */ |
| 156 | break; |
| 157 | default: |
| 158 | /* do system reset */ |
| 159 | return 0; |
| 160 | } |
| 161 | /* everything handled */ |
| 162 | return 1; |
| 163 | } |
| 164 | |
| 165 | static int __init cbe_find_pmd_mmio(int cpu, struct cbe_pervasive *p) |
| 166 | { |
| 167 | struct device_node *node; |
| 168 | unsigned int *int_servers; |
| 169 | char *addr; |
| 170 | unsigned long real_address; |
| 171 | unsigned int size; |
| 172 | |
| 173 | struct pmd_regs __iomem *pmd_mmio_area; |
| 174 | int hardid, thread; |
| 175 | int proplen; |
| 176 | |
| 177 | pmd_mmio_area = NULL; |
| 178 | hardid = get_hard_smp_processor_id(cpu); |
| 179 | for (node = NULL; (node = of_find_node_by_type(node, "cpu"));) { |
| 180 | int_servers = (void *) get_property(node, |
| 181 | "ibm,ppc-interrupt-server#s", &proplen); |
| 182 | if (!int_servers) { |
| 183 | printk(KERN_WARNING "%s misses " |
| 184 | "ibm,ppc-interrupt-server#s property", |
| 185 | node->full_name); |
| 186 | continue; |
| 187 | } |
| 188 | for (thread = 0; thread < proplen / sizeof (int); thread++) { |
| 189 | if (hardid == int_servers[thread]) { |
| 190 | addr = get_property(node, "pervasive", NULL); |
| 191 | goto found; |
| 192 | } |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | printk(KERN_WARNING "%s: CPU %d not found\n", __FUNCTION__, cpu); |
| 197 | return -EINVAL; |
| 198 | |
| 199 | found: |
| 200 | real_address = *(unsigned long*) addr; |
| 201 | addr += sizeof (unsigned long); |
| 202 | size = *(unsigned int*) addr; |
| 203 | |
| 204 | pr_debug("pervasive area for CPU %d at %lx, size %x\n", |
| 205 | cpu, real_address, size); |
Arnd Bergmann | 47952d5 | 2006-03-24 19:47:52 +0100 | [diff] [blame] | 206 | p->regs = ioremap(real_address, size); |
Arnd Bergmann | c902be7 | 2006-01-04 19:55:53 +0000 | [diff] [blame] | 207 | p->thread = thread; |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | void __init cell_pervasive_init(void) |
| 212 | { |
| 213 | struct cbe_pervasive *p; |
| 214 | int cpu; |
| 215 | int ret; |
| 216 | |
| 217 | if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO)) |
| 218 | return; |
| 219 | |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame^] | 220 | for_each_possible_cpu(cpu) { |
Arnd Bergmann | c902be7 | 2006-01-04 19:55:53 +0000 | [diff] [blame] | 221 | p = &cbe_pervasive[cpu]; |
| 222 | ret = cbe_find_pmd_mmio(cpu, p); |
| 223 | if (ret) |
| 224 | return; |
| 225 | } |
| 226 | |
| 227 | ppc_md.idle_loop = cbe_idle; |
| 228 | ppc_md.system_reset_exception = cbe_system_reset_exception; |
| 229 | } |