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Subject[PATCH v12 09/21] h8300: kernel startup
Date
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
Documentation/devicetree/bindings/h8300/cpu.txt | 13 ++
.../memory-controllers/renesas,h8300-bsc.txt | 12 +
arch/h8300/kernel/setup.c | 255 +++++++++++++++++++++
3 files changed, 280 insertions(+)
create mode 100644 Documentation/devicetree/bindings/h8300/cpu.txt
create mode 100644 Documentation/devicetree/bindings/memory-controllers/renesas,h8300-bsc.txt
create mode 100644 arch/h8300/kernel/setup.c

diff --git a/Documentation/devicetree/bindings/h8300/cpu.txt b/Documentation/devicetree/bindings/h8300/cpu.txt
new file mode 100644
index 0000000..70cd586
--- /dev/null
+++ b/Documentation/devicetree/bindings/h8300/cpu.txt
@@ -0,0 +1,13 @@
+* H8/300 CPU bindings
+
+Required properties:
+
+- compatible: Compatible property value should be "renesas,h8300".
+- clock-frequency: Contains the clock frequency for CPU, in Hz.
+
+Example:
+
+ cpu@0 {
+ compatible = "renesas,h8300";
+ clock-frequency = <20000000>;
+ };
diff --git a/Documentation/devicetree/bindings/memory-controllers/renesas,h8300-bsc.txt b/Documentation/devicetree/bindings/memory-controllers/renesas,h8300-bsc.txt
new file mode 100644
index 0000000..cdf406c
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/renesas,h8300-bsc.txt
@@ -0,0 +1,12 @@
+* H8/300 bus controller
+
+Required properties:
+ - compatible: Must be "renesas,h8300-bsc".
+ - reg: Base address and length of BSC registers.
+
+Example.
+ bsc: memory-controller@fee01e {
+ compatible = "renesas,h8300h-bsc", "renesas,h8300-bsc";
+ reg = <0xfee01e 8>;
+ };
+
diff --git a/arch/h8300/kernel/setup.c b/arch/h8300/kernel/setup.c
new file mode 100644
index 0000000..0fd1fe6
--- /dev/null
+++ b/arch/h8300/kernel/setup.c
@@ -0,0 +1,255 @@
+/*
+ * linux/arch/h8300/kernel/setup.c
+ *
+ * Copyright (C) 2001-2014 Yoshinori Sato <ysato@users.sourceforge.jp>
+ */
+
+/*
+ * This file handles the architecture-dependent parts of system setup
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/console.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/clk-provider.h>
+#include <linux/memblock.h>
+#include <linux/screen_info.h>
+
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+#include <asm/page.h>
+
+#if defined(CONFIG_CPU_H8300H)
+#define CPU "H8/300H"
+#elif defined(CONFIG_CPU_H8S)
+#define CPU "H8S"
+#else
+#define CPU "Unknown"
+#endif
+
+unsigned long memory_start;
+unsigned long memory_end;
+EXPORT_SYMBOL(memory_end);
+static unsigned long freq;
+extern char __dtb_start[];
+
+#ifdef CONFIG_VT
+struct screen_info screen_info;
+#endif
+
+char __initdata command_line[COMMAND_LINE_SIZE];
+
+void sim_console_register(void);
+
+void __init h8300_fdt_init(void *fdt, char *bootargs)
+{
+ if (!fdt)
+ fdt = __dtb_start;
+ else
+ strcpy(command_line, bootargs);
+
+ early_init_dt_scan(fdt);
+ memblock_allow_resize();
+}
+
+static void __init bootmem_init(void)
+{
+ int bootmap_size;
+ unsigned long ram_start_pfn;
+ unsigned long free_ram_start_pfn;
+ unsigned long ram_end_pfn;
+ struct memblock_region *region;
+
+ memory_end = memory_start = 0;
+
+ /* Find main memory where is the kernel */
+ for_each_memblock(memory, region) {
+ memory_start = region->base;
+ memory_end = region->base + region->size;
+ }
+
+ if (!memory_end)
+ panic("No memory!");
+
+ ram_start_pfn = PFN_UP(memory_start);
+ /* free_ram_start_pfn is first page after kernel */
+ free_ram_start_pfn = PFN_UP(__pa(_end));
+ ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
+
+ max_pfn = ram_end_pfn;
+
+ /*
+ * 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),
+ free_ram_start_pfn,
+ 0,
+ ram_end_pfn);
+ /*
+ * free the usable memory, we have to make sure we do not free
+ * the bootmem bitmap so we then reserve it after freeing it :-)
+ */
+ free_bootmem(PFN_PHYS(free_ram_start_pfn),
+ (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
+ reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
+ BOOTMEM_DEFAULT);
+
+ for_each_memblock(reserved, region) {
+ reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
+ }
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+ unflatten_and_copy_device_tree();
+
+ init_mm.start_code = (unsigned long) _stext;
+ init_mm.end_code = (unsigned long) _etext;
+ init_mm.end_data = (unsigned long) _edata;
+ init_mm.brk = (unsigned long) 0;
+
+ pr_notice("\r\n\nuClinux " CPU "\n");
+ pr_notice("Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne\n");
+
+ if (*command_line)
+ strcpy(boot_command_line, command_line);
+ *cmdline_p = boot_command_line;
+
+ parse_early_param();
+
+ bootmem_init();
+#if defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)
+ sim_console_register();
+#endif
+
+ early_platform_driver_probe("earlyprintk", 1, 0);
+ /*
+ * get kmalloc into gear
+ */
+ paging_init();
+}
+
+/*
+ * Get CPU information for use by the procfs.
+ */
+
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+ char *cpu;
+
+ cpu = CPU;
+
+ seq_printf(m, "CPU:\t\t%s\n"
+ "Clock:\t\t%lu.%1luMHz\n"
+ "BogoMips:\t%lu.%02lu\n"
+ "Calibration:\t%lu loops\n",
+ cpu,
+ freq/1000, freq%1000,
+ (loops_per_jiffy*HZ)/500000,
+ ((loops_per_jiffy*HZ)/5000)%100,
+ (loops_per_jiffy*HZ));
+
+ return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ return *pos < num_possible_cpus() ?
+ ((void *) 0x12345678) : 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,
+};
+
+static int __init device_probe(void)
+{
+ of_platform_populate(NULL, NULL, NULL, NULL);
+
+ return 0;
+}
+
+device_initcall(device_probe);
+
+#if defined(CONFIG_CPU_H8300H)
+#define get_wait(base, addr) ({ \
+ int baddr; \
+ baddr = ((addr) / 0x200000 * 2); \
+ w *= (ctrl_inw((unsigned long)(base) + 2) & (3 << baddr)) + 1; \
+ })
+#endif
+#if defined(CONFIG_CPU_H8S)
+#define get_wait(base, addr) ({ \
+ int baddr; \
+ baddr = ((addr) / 0x200000 * 16); \
+ w *= (ctrl_inl((unsigned long)(base) + 2) & (7 << baddr)) + 1; \
+ })
+#endif
+
+static __init int access_timing(void)
+{
+ struct device_node *bsc;
+ void __iomem *base;
+ unsigned long addr = (unsigned long)&__delay;
+ int bit = 1 << (addr / 0x200000);
+ int w;
+
+ bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
+ base = of_iomap(bsc, 0);
+ w = (ctrl_inb((unsigned long)base + 0) & bit)?2:1;
+ if (ctrl_inb((unsigned long)base + 1) & bit)
+ w *= get_wait(base, addr);
+ else
+ w *= 2;
+ return w * 3 / 2;
+}
+
+void __init calibrate_delay(void)
+{
+ struct device_node *cpu;
+ int freq;
+
+ cpu = of_find_compatible_node(NULL, NULL, "renesas,h8300");
+ of_property_read_s32(cpu, "clock-frequency", &freq);
+ loops_per_jiffy = freq / HZ / (access_timing() * 2);
+ pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
+ loops_per_jiffy / (500000 / HZ),
+ (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
+}
+
+
+void __init time_init(void)
+{
+ of_clk_init(NULL);
+}
--
2.1.4


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