diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/kernel/processor.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/kernel/processor.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/processor.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/processor.c new file mode 100644 index 000000000..55d1bdf62 --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/kernel/processor.c @@ -0,0 +1,348 @@ +/* + * arch/ubicom32/kernel/processor.c + * Ubicom32 architecture processor info implementation. + * + * (C) Copyright 2009, Ubicom, Inc. + * + * This file is part of the Ubicom32 Linux Kernel Port. + * + * The Ubicom32 Linux Kernel Port 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. + * + * The Ubicom32 Linux Kernel Port is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; without even the implied + * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with the Ubicom32 Linux Kernel Port. If not, + * see <http://www.gnu.org/licenses/>. + * + * Ubicom32 implementation derived from (with many thanks): + * arch/m68knommu + * arch/blackfin + * arch/parisc + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/profile.h> +#include <linux/clocksource.h> +#include <linux/types.h> +#include <linux/seq_file.h> +#include <linux/delay.h> +#include <linux/cpu.h> +#include <asm/devtree.h> +#include <asm/processor.h> +#include <asm/cpu.h> +#include <asm/ocm_size.h> + +struct procnode { + struct devtree_node dn; + unsigned int threads; + unsigned int timers; + unsigned int frequency; + unsigned int ddr_frequency; + unsigned int interrupt0; + unsigned int interrupt1; + void *socm; + void *eocm; + void *sdram; + void *edram; + unsigned int arch_version; + void *os_syscall_begin; + void *os_syscall_end; +}; + +struct procnode *pn; + +/* + * show_processorinfo() + * Print the actual processor information. + */ +static void show_processorinfo(struct seq_file *m) +{ + char *cpu, *mmu, *fpu; + unsigned int clockfreq; + unsigned int chipid; + + cpu = CPU; + mmu = "none"; + fpu = "none"; + + asm volatile ( + "move.4 %0, CHIP_ID \n\t" + : "=r" (chipid) + ); + + /* + * General Processor Information. + */ + seq_printf(m, "Vendor:\t\t%s\n", "Ubicom"); + seq_printf(m, "CPU:\t\t%s\n", cpu); + seq_printf(m, "MMU:\t\t%s\n", mmu); + seq_printf(m, "FPU:\t\t%s\n", fpu); + seq_printf(m, "Arch:\t\t%hx\n", chipid >> 16); + seq_printf(m, "Rev:\t\t%hx\n", (chipid & 0xffff)); + + /* + * Now compute the clock frequency in Mhz. + */ + clockfreq = processor_frequency(); + seq_printf(m, "Clock Freq:\t%u.0 MHz\n", + clockfreq / 1000000); + seq_printf(m, "DDR Freq:\t%u.0 MHz\n", + pn ? pn->ddr_frequency / 1000000 : 0); + seq_printf(m, "BogoMips:\t%lu.%02lu\n", + (loops_per_jiffy * HZ) / 500000, + ((loops_per_jiffy * HZ) / 5000) % 100); + seq_printf(m, "Calibration:\t%lu loops\n", (loops_per_jiffy * HZ)); +} + +/* + * show_cpuinfo() + * Get CPU information for use by the procfs. + */ +static int show_cpuinfo(struct seq_file *m, void *v) +{ + unsigned long n = (unsigned long)v - 1; + +#if defined(CONFIG_SMP) + struct cpuinfo_ubicom32 *p = &per_cpu(cpu_data, n); +#endif + + /* + * Print the general processor information on the first + * call. + */ + if (n == 0) { + show_processorinfo(m); + } + +#if defined(CONFIG_SMP) + /* + * For each hwthread, print if this hwthread is running Linux + * or is an I/O thread. + */ + if (cpu_isset(n, cpu_online_map)) { + seq_printf(m, "cpu[%02lu]:\tthread id - %lu\n", n, p->tid); + } else { + seq_printf(m, "cpu[%02lu]:\toff-line\n", n); + } +#endif + return 0; + +} + +static void *c_start(struct seq_file *m, loff_t *pos) +{ + unsigned long i = *pos; + + return i < NR_CPUS ? (void *)(i + 1) : NULL; +} + +static void *c_next(struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return c_start(m, pos); +} + +static void c_stop(struct seq_file *m, void *v) +{ +} + +const struct seq_operations cpuinfo_op = { + .start = c_start, + .next = c_next, + .stop = c_stop, + .show = show_cpuinfo, +}; + +/* + * processor_timers() + * Returns the timers available to Linux. + */ +unsigned int processor_timers(void) +{ + if (!pn) { + return 0; + } + return pn->timers; +} + +/* + * processor_threads() + * Returns the threads available to Linux. + */ +unsigned int processor_threads(void) +{ + if (!pn) { + return 0; + } + return pn->threads; +} + +/* + * processor_frequency() + * Returns the frequency of the system clock. + */ +unsigned int processor_frequency(void) +{ + if (!pn) { + return 0; + } + return pn->frequency; +} +EXPORT_SYMBOL(processor_frequency); + +/* + * processor_interrupts() + * Return the interrupts that are setup at boot time. + */ +int processor_interrupts(unsigned int *int0, unsigned int *int1) +{ + if (!pn) { + return -EFAULT; + } + + if (int0) { + *int0 = pn->interrupt0; + } + + if (int1) { + *int1 = pn->interrupt1; + } + return 0; +} + +/* + * processor_ocm() + * Returns the start and end of OCM available to Linux. + */ +void processor_ocm(unsigned long *socm, unsigned long *eocm) +{ + *socm = (unsigned long)pn->socm; + *eocm = (unsigned long)pn->eocm; +} + +/* + * processor_dram() + * Returns the start and end of dram available to Linux. + */ +void processor_dram(unsigned long *sdram, unsigned long *edram) +{ + *sdram = (unsigned long)pn->sdram; + *edram = (unsigned long)pn->edram; +} + +/* + * processor_validate_failed() + * Returns the dram available to Linux. + */ +static noinline void processor_validate_failed(void) +{ + while (1) + THREAD_STALL; +} + +/* + * processor_validate() + * Validates the procnode against limitations of this link/built. + */ +static void processor_validate(void) +{ + void *dram_start = (void *)(KERNELSTART); + void *dram_end = (void *)(SDRAMSTART + CONFIG_MIN_RAMSIZE); +#if APP_OCM_CODE_SIZE || APP_OCM_DATA_SIZE + void *ocm_code_start = (void *)(OCMSTART + APP_OCM_CODE_SIZE); + void *ocm_data_end = (void *)(OCMEND - APP_OCM_DATA_SIZE); +#endif + extern void __os_syscall_begin; + extern void __os_syscall_end; + int proc_node_valid = 1; + + if (!pn) { + printk(KERN_ERR "ERROR: processor node not found\n"); + goto error; + } + + + if (dram_start < pn->sdram || dram_end > pn->edram) { + printk(KERN_ERR "ERROR: processor dram mismatch %p-%p " + "available but we are expecting %p-%p\n", + pn->sdram, pn->edram, dram_start, dram_end); + proc_node_valid = 0; + } else { + printk(KERN_ERR "processor dram %p-%p, expecting %p-%p\n", + pn->sdram, pn->edram, dram_start, dram_end); + } + if (&__os_syscall_begin < pn->os_syscall_begin || + &__os_syscall_end > pn->os_syscall_end) { + printk(KERN_ERR "ERROR: processor syscall area mismatch " + "%p-%p available but we are expecting %p-%p\n", + pn->os_syscall_begin, pn->os_syscall_end, + &__os_syscall_begin, &__os_syscall_end); + proc_node_valid = 0; + } else { + printk(KERN_ERR "processor dram %p-%p, expecting %p-%p\n", + pn->sdram, pn->edram, dram_start, dram_end); + } +#if APP_OCM_CODE_SIZE || APP_OCM_DATA_SIZE + if (ocm_code_start < pn->socm || ocm_data_end > pn->eocm) { + printk(KERN_ERR "ERROR: processor ocm mismatch %p-%p " + "available but we are expecting %p-%p\n", + pn->socm, pn->eocm, ocm_code_start, ocm_data_end); + proc_node_valid = 0; + } else { + printk(KERN_INFO "processor ocm %p-%p, expecting %p-%p\n", + pn->socm, pn->eocm, ocm_code_start, ocm_data_end); + + } +#endif + + if (UBICOM32_ARCH_VERSION != pn->arch_version) { + printk(KERN_ERR "ERROR: processor arch mismatch, kernel" + "compiled for %d found %d\n", + UBICOM32_ARCH_VERSION, pn->arch_version); + proc_node_valid = 0; + } + + if (proc_node_valid) + return; +error: + processor_validate_failed(); +} + +void __init processor_init(void) +{ + /* + * If we do not have a trap node in the device tree, we leave the fault + * handling to the underlying hardware. + */ + pn = (struct procnode *)devtree_find_node("processor"); + + processor_validate(); + + /* + * If necessary correct the initial range registers to cover the + * complete physical space + */ + if (pn->edram > (void *)(SDRAMSTART + CONFIG_MIN_RAMSIZE)) { + printk(KERN_INFO "updating range registers for expanded dram\n"); + asm volatile ( + " move.4 D_RANGE1_HI, %0 \t\n" + " move.4 I_RANGE0_HI, %0 \t\n" +#ifdef CONFIG_PROTECT_KERNEL + " move.4 D_RANGE2_HI, %0 \t\n" + " move.4 I_RANGE2_HI, %0 \t\n" +#endif + : : "a"((unsigned long)pn->edram - 4) + ); + } + +} |