+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Port on Texas Instruments TMS320C6x architecture
- *
- * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
- * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
- */
-#include <linux/dma-mapping.h>
-#include <linux/memblock.h>
-#include <linux/seq_file.h>
-#include <linux/clkdev.h>
-#include <linux/initrd.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/of_fdt.h>
-#include <linux/string.h>
-#include <linux/errno.h>
-#include <linux/cache.h>
-#include <linux/delay.h>
-#include <linux/sched.h>
-#include <linux/clk.h>
-#include <linux/cpu.h>
-#include <linux/fs.h>
-#include <linux/of.h>
-#include <linux/console.h>
-#include <linux/screen_info.h>
-
-#include <asm/sections.h>
-#include <asm/div64.h>
-#include <asm/setup.h>
-#include <asm/dscr.h>
-#include <asm/clock.h>
-#include <asm/soc.h>
-#include <asm/special_insns.h>
-
-static const char *c6x_soc_name;
-
-struct screen_info screen_info;
-
-int c6x_num_cores;
-EXPORT_SYMBOL_GPL(c6x_num_cores);
-
-unsigned int c6x_silicon_rev;
-EXPORT_SYMBOL_GPL(c6x_silicon_rev);
-
-/*
- * Device status register. This holds information
- * about device configuration needed by some drivers.
- */
-unsigned int c6x_devstat;
-EXPORT_SYMBOL_GPL(c6x_devstat);
-
-/*
- * Some SoCs have fuse registers holding a unique MAC
- * address. This is parsed out of the device tree with
- * the resulting MAC being held here.
- */
-unsigned char c6x_fuse_mac[6];
-
-unsigned long memory_start;
-unsigned long memory_end;
-EXPORT_SYMBOL(memory_end);
-
-unsigned long ram_start;
-unsigned long ram_end;
-
-/* Uncached memory for DMA consistent use (memdma=) */
-static unsigned long dma_start __initdata;
-static unsigned long dma_size __initdata;
-
-struct cpuinfo_c6x {
- const char *cpu_name;
- const char *cpu_voltage;
- const char *mmu;
- const char *fpu;
- char *cpu_rev;
- unsigned int core_id;
- char __cpu_rev[5];
-};
-
-static DEFINE_PER_CPU(struct cpuinfo_c6x, cpu_data);
-
-unsigned int ticks_per_ns_scaled;
-EXPORT_SYMBOL(ticks_per_ns_scaled);
-
-unsigned int c6x_core_freq;
-
-static void __init get_cpuinfo(void)
-{
- unsigned cpu_id, rev_id, csr;
- struct clk *coreclk = clk_get_sys(NULL, "core");
- unsigned long core_khz;
- u64 tmp;
- struct cpuinfo_c6x *p;
- struct device_node *node;
-
- p = &per_cpu(cpu_data, smp_processor_id());
-
- if (!IS_ERR(coreclk))
- c6x_core_freq = clk_get_rate(coreclk);
- else {
- printk(KERN_WARNING
- "Cannot find core clock frequency. Using 700MHz\n");
- c6x_core_freq = 700000000;
- }
-
- core_khz = c6x_core_freq / 1000;
-
- tmp = (uint64_t)core_khz << C6X_NDELAY_SCALE;
- do_div(tmp, 1000000);
- ticks_per_ns_scaled = tmp;
-
- csr = get_creg(CSR);
- cpu_id = csr >> 24;
- rev_id = (csr >> 16) & 0xff;
-
- p->mmu = "none";
- p->fpu = "none";
- p->cpu_voltage = "unknown";
-
- switch (cpu_id) {
- case 0:
- p->cpu_name = "C67x";
- p->fpu = "yes";
- break;
- case 2:
- p->cpu_name = "C62x";
- break;
- case 8:
- p->cpu_name = "C64x";
- break;
- case 12:
- p->cpu_name = "C64x";
- break;
- case 16:
- p->cpu_name = "C64x+";
- p->cpu_voltage = "1.2";
- break;
- case 21:
- p->cpu_name = "C66X";
- p->cpu_voltage = "1.2";
- break;
- default:
- p->cpu_name = "unknown";
- break;
- }
-
- if (cpu_id < 16) {
- switch (rev_id) {
- case 0x1:
- if (cpu_id > 8) {
- p->cpu_rev = "DM640/DM641/DM642/DM643";
- p->cpu_voltage = "1.2 - 1.4";
- } else {
- p->cpu_rev = "C6201";
- p->cpu_voltage = "2.5";
- }
- break;
- case 0x2:
- p->cpu_rev = "C6201B/C6202/C6211";
- p->cpu_voltage = "1.8";
- break;
- case 0x3:
- p->cpu_rev = "C6202B/C6203/C6204/C6205";
- p->cpu_voltage = "1.5";
- break;
- case 0x201:
- p->cpu_rev = "C6701 revision 0 (early CPU)";
- p->cpu_voltage = "1.8";
- break;
- case 0x202:
- p->cpu_rev = "C6701/C6711/C6712";
- p->cpu_voltage = "1.8";
- break;
- case 0x801:
- p->cpu_rev = "C64x";
- p->cpu_voltage = "1.5";
- break;
- default:
- p->cpu_rev = "unknown";
- }
- } else {
- p->cpu_rev = p->__cpu_rev;
- snprintf(p->__cpu_rev, sizeof(p->__cpu_rev), "0x%x", cpu_id);
- }
-
- p->core_id = get_coreid();
-
- for_each_of_cpu_node(node)
- ++c6x_num_cores;
-
- node = of_find_node_by_name(NULL, "soc");
- if (node) {
- if (of_property_read_string(node, "model", &c6x_soc_name))
- c6x_soc_name = "unknown";
- of_node_put(node);
- } else
- c6x_soc_name = "unknown";
-
- printk(KERN_INFO "CPU%d: %s rev %s, %s volts, %uMHz\n",
- p->core_id, p->cpu_name, p->cpu_rev,
- p->cpu_voltage, c6x_core_freq / 1000000);
-}
-
-/*
- * Early parsing of the command line
- */
-static u32 mem_size __initdata;
-
-/* "mem=" parsing. */
-static int __init early_mem(char *p)
-{
- if (!p)
- return -EINVAL;
-
- mem_size = memparse(p, &p);
- /* don't remove all of memory when handling "mem={invalid}" */
- if (mem_size == 0)
- return -EINVAL;
-
- return 0;
-}
-early_param("mem", early_mem);
-
-/* "memdma=<size>[@<address>]" parsing. */
-static int __init early_memdma(char *p)
-{
- if (!p)
- return -EINVAL;
-
- dma_size = memparse(p, &p);
- if (*p == '@')
- dma_start = memparse(p, &p);
-
- return 0;
-}
-early_param("memdma", early_memdma);
-
-int __init c6x_add_memory(phys_addr_t start, unsigned long size)
-{
- static int ram_found __initdata;
-
- /* We only handle one bank (the one with PAGE_OFFSET) for now */
- if (ram_found)
- return -EINVAL;
-
- if (start > PAGE_OFFSET || PAGE_OFFSET >= (start + size))
- return 0;
-
- ram_start = start;
- ram_end = start + size;
-
- ram_found = 1;
- return 0;
-}
-
-/*
- * Do early machine setup and device tree parsing. This is called very
- * early on the boot process.
- */
-notrace void __init machine_init(unsigned long dt_ptr)
-{
- void *dtb = __va(dt_ptr);
- void *fdt = __dtb_start;
-
- /* interrupts must be masked */
- set_creg(IER, 2);
-
- /*
- * Set the Interrupt Service Table (IST) to the beginning of the
- * vector table.
- */
- set_ist(_vectors_start);
-
- /*
- * dtb is passed in from bootloader.
- * fdt is linked in blob.
- */
- if (dtb && dtb != fdt)
- fdt = dtb;
-
- /* Do some early initialization based on the flat device tree */
- early_init_dt_scan(fdt);
-
- parse_early_param();
-}
-
-void __init setup_arch(char **cmdline_p)
-{
- phys_addr_t start, end;
- u64 i;
-
- printk(KERN_INFO "Initializing kernel\n");
-
- /* Initialize command line */
- *cmdline_p = boot_command_line;
-
- memory_end = ram_end;
- memory_end &= ~(PAGE_SIZE - 1);
-
- if (mem_size && (PAGE_OFFSET + PAGE_ALIGN(mem_size)) < memory_end)
- memory_end = PAGE_OFFSET + PAGE_ALIGN(mem_size);
-
- /* add block that this kernel can use */
- memblock_add(PAGE_OFFSET, memory_end - PAGE_OFFSET);
-
- /* reserve kernel text/data/bss */
- memblock_reserve(PAGE_OFFSET,
- PAGE_ALIGN((unsigned long)&_end - PAGE_OFFSET));
-
- if (dma_size) {
- /* align to cacheability granularity */
- dma_size = CACHE_REGION_END(dma_size);
-
- if (!dma_start)
- dma_start = memory_end - dma_size;
-
- /* align to cacheability granularity */
- dma_start = CACHE_REGION_START(dma_start);
-
- /* reserve DMA memory taken from kernel memory */
- if (memblock_is_region_memory(dma_start, dma_size))
- memblock_reserve(dma_start, dma_size);
- }
-
- memory_start = PAGE_ALIGN((unsigned int) &_end);
-
- printk(KERN_INFO "Memory Start=%08lx, Memory End=%08lx\n",
- memory_start, memory_end);
-
-#ifdef CONFIG_BLK_DEV_INITRD
- /*
- * Reserve initrd memory if in kernel memory.
- */
- if (initrd_start < initrd_end)
- if (memblock_is_region_memory(initrd_start,
- initrd_end - initrd_start))
- memblock_reserve(initrd_start,
- initrd_end - initrd_start);
-#endif
-
- init_mm.start_code = (unsigned long) &_stext;
- init_mm.end_code = (unsigned long) &_etext;
- init_mm.end_data = memory_start;
- init_mm.brk = memory_start;
-
- unflatten_and_copy_device_tree();
-
- c6x_cache_init();
-
- /* Set the whole external memory as non-cacheable */
- disable_caching(ram_start, ram_end - 1);
-
- /* Set caching of external RAM used by Linux */
- for_each_mem_range(i, &start, &end)
- enable_caching(CACHE_REGION_START(start),
- CACHE_REGION_START(end - 1));
-
-#ifdef CONFIG_BLK_DEV_INITRD
- /*
- * Enable caching for initrd which falls outside kernel memory.
- */
- if (initrd_start < initrd_end) {
- if (!memblock_is_region_memory(initrd_start,
- initrd_end - initrd_start))
- enable_caching(CACHE_REGION_START(initrd_start),
- CACHE_REGION_START(initrd_end - 1));
- }
-#endif
-
- /*
- * Disable caching for dma coherent memory taken from kernel memory.
- */
- if (dma_size && memblock_is_region_memory(dma_start, dma_size))
- disable_caching(dma_start,
- CACHE_REGION_START(dma_start + dma_size - 1));
-
- /* Initialize the coherent memory allocator */
- coherent_mem_init(dma_start, dma_size);
-
- max_low_pfn = PFN_DOWN(memory_end);
- min_low_pfn = PFN_UP(memory_start);
- max_pfn = max_low_pfn;
- max_mapnr = max_low_pfn - min_low_pfn;
-
- /* Get kmalloc into gear */
- paging_init();
-
- /*
- * Probe for Device State Configuration Registers.
- * We have to do this early in case timer needs to be enabled
- * through DSCR.
- */
- dscr_probe();
-
- /* We do this early for timer and core clock frequency */
- c64x_setup_clocks();
-
- /* Get CPU info */
- get_cpuinfo();
-
-#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
- conswitchp = &dummy_con;
-#endif
-}
-
-#define cpu_to_ptr(n) ((void *)((long)(n)+1))
-#define ptr_to_cpu(p) ((long)(p) - 1)
-
-static int show_cpuinfo(struct seq_file *m, void *v)
-{
- int n = ptr_to_cpu(v);
- struct cpuinfo_c6x *p = &per_cpu(cpu_data, n);
-
- if (n == 0) {
- seq_printf(m,
- "soc\t\t: %s\n"
- "soc revision\t: 0x%x\n"
- "soc cores\t: %d\n",
- c6x_soc_name, c6x_silicon_rev, c6x_num_cores);
- }
-
- seq_printf(m,
- "\n"
- "processor\t: %d\n"
- "cpu\t\t: %s\n"
- "core revision\t: %s\n"
- "core voltage\t: %s\n"
- "core id\t\t: %d\n"
- "mmu\t\t: %s\n"
- "fpu\t\t: %s\n"
- "cpu MHz\t\t: %u\n"
- "bogomips\t: %lu.%02lu\n\n",
- n,
- p->cpu_name, p->cpu_rev, p->cpu_voltage,
- p->core_id, p->mmu, p->fpu,
- (c6x_core_freq + 500000) / 1000000,
- (loops_per_jiffy/(500000/HZ)),
- (loops_per_jiffy/(5000/HZ))%100);
-
- return 0;
-}
-
-static void *c_start(struct seq_file *m, loff_t *pos)
-{
- return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
-}
-static void *c_next(struct seq_file *m, void *v, loff_t *pos)
-{
- ++*pos;
- return NULL;
-}
-static void c_stop(struct seq_file *m, void *v)
-{
-}
-
-const struct seq_operations cpuinfo_op = {
- c_start,
- c_stop,
- c_next,
- show_cpuinfo
-};
-
-static struct cpu cpu_devices[NR_CPUS];
-
-static int __init topology_init(void)
-{
- int i;
-
- for_each_present_cpu(i)
- register_cpu(&cpu_devices[i], i);
-
- return 0;
-}
-
-subsys_initcall(topology_init);
projects / linux-2.6-block.git / blobdiff