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-rw-r--r--arch/c6x/kernel/setup.c510
1 files changed, 510 insertions, 0 deletions
diff --git a/arch/c6x/kernel/setup.c b/arch/c6x/kernel/setup.c
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+++ b/arch/c6x/kernel/setup.c
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+/*
+ * Port on Texas Instruments TMS320C6x architecture
+ *
+ * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
+ * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/dma-mapping.h>
+#include <linux/memblock.h>
+#include <linux/seq_file.h>
+#include <linux/bootmem.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 <asm/sections.h>
+#include <asm/div64.h>
+#include <asm/setup.h>
+#include <asm/dscr.h>
+#include <asm/clock.h>
+#include <asm/soc.h>
+
+static const char *c6x_soc_name;
+
+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;
+
+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;
+
+char c6x_command_line[COMMAND_LINE_SIZE];
+
+#if defined(CONFIG_CMDLINE_BOOL)
+static const char default_command_line[COMMAND_LINE_SIZE] __section(.cmdline) =
+ CONFIG_CMDLINE;
+#endif
+
+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, *np;
+
+ 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;
+ 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();
+
+ node = of_find_node_by_name(NULL, "cpus");
+ if (node) {
+ for_each_child_of_node(node, np)
+ if (!strcmp("cpu", np->name))
+ ++c6x_num_cores;
+ of_node_put(node);
+ }
+
+ 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)
+{
+ struct boot_param_header *dtb = __va(dt_ptr);
+ struct boot_param_header *fdt = (struct boot_param_header *)_fdt_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);
+
+ lockdep_init();
+
+ /*
+ * 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_devtree(fdt);
+
+ /* parse_early_param needs a boot_command_line */
+ strlcpy(boot_command_line, c6x_command_line, COMMAND_LINE_SIZE);
+ parse_early_param();
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+ int bootmap_size;
+ struct memblock_region *reg;
+
+ printk(KERN_INFO "Initializing kernel\n");
+
+ /* Initialize command line */
+ *cmdline_p = c6x_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;
+
+ /*
+ * Give all the memory to the bootmap allocator, tell it to put the
+ * boot mem_map at the start of memory
+ */
+ bootmap_size = init_bootmem_node(NODE_DATA(0),
+ memory_start >> PAGE_SHIFT,
+ PAGE_OFFSET >> PAGE_SHIFT,
+ memory_end >> PAGE_SHIFT);
+ memblock_reserve(memory_start, bootmap_size);
+
+ unflatten_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_memblock(memory, reg)
+ enable_caching(CACHE_REGION_START(reg->base),
+ CACHE_REGION_START(reg->base + reg->size - 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);
+
+ /*
+ * Free all memory as a starting point.
+ */
+ free_bootmem(PAGE_OFFSET, memory_end - PAGE_OFFSET);
+
+ /*
+ * Then reserve memory which is already being used.
+ */
+ for_each_memblock(reserved, reg) {
+ pr_debug("reserved - 0x%08x-0x%08x\n",
+ (u32) reg->base, (u32) reg->size);
+ reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
+ }
+
+ max_low_pfn = PFN_DOWN(memory_end);
+ min_low_pfn = PFN_UP(memory_start);
+ 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);