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Diffstat (limited to 'arch/xtensa/kernel/setup.c')
-rw-r--r--arch/xtensa/kernel/setup.c188
1 files changed, 151 insertions, 37 deletions
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 143251ede897..88a044af7504 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -7,6 +7,7 @@
*
* Copyright (C) 1995 Linus Torvalds
* Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2014 - 2016 Cadence Design Systems Inc.
*
* Chris Zankel <chris@zankel.net>
* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
@@ -22,7 +23,6 @@
#include <linux/bootmem.h>
#include <linux/kernel.h>
#include <linux/percpu.h>
-#include <linux/clk-provider.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
@@ -114,7 +114,7 @@ static int __init parse_tag_mem(const bp_tag_t *tag)
if (mi->type != MEMORY_TYPE_CONVENTIONAL)
return -1;
- return add_sysmem_bank(mi->start, mi->end);
+ return memblock_add(mi->start, mi->end - mi->start);
}
__tagtable(BP_TAG_MEMORY, parse_tag_mem);
@@ -188,7 +188,6 @@ static int __init parse_bootparam(const bp_tag_t* tag)
}
#ifdef CONFIG_OF
-bool __initdata dt_memory_scan = false;
#if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
@@ -228,11 +227,8 @@ static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
- if (!dt_memory_scan)
- return;
-
size &= PAGE_MASK;
- add_sysmem_bank(base, base + size);
+ memblock_add(base, size);
}
void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
@@ -242,9 +238,6 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
void __init early_init_devtree(void *params)
{
- if (sysmem.nr_banks == 0)
- dt_memory_scan = true;
-
early_init_dt_scan(params);
of_scan_flat_dt(xtensa_dt_io_area, NULL);
@@ -252,14 +245,6 @@ void __init early_init_devtree(void *params)
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
}
-static int __init xtensa_device_probe(void)
-{
- of_clk_init(NULL);
- return 0;
-}
-
-device_initcall(xtensa_device_probe);
-
#endif /* CONFIG_OF */
/*
@@ -277,12 +262,6 @@ void __init init_arch(bp_tag_t *bp_start)
early_init_devtree(dtb_start);
#endif
- if (sysmem.nr_banks == 0) {
- add_sysmem_bank(PLATFORM_DEFAULT_MEM_START,
- PLATFORM_DEFAULT_MEM_START +
- PLATFORM_DEFAULT_MEM_SIZE);
- }
-
#ifdef CONFIG_CMDLINE_BOOL
if (!command_line[0])
strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
@@ -452,6 +431,10 @@ static int __init check_s32c1i(void)
early_initcall(check_s32c1i);
#endif /* CONFIG_S32C1I_SELFTEST */
+static inline int mem_reserve(unsigned long start, unsigned long end)
+{
+ return memblock_reserve(start, end - start);
+}
void __init setup_arch(char **cmdline_p)
{
@@ -463,54 +446,54 @@ void __init setup_arch(char **cmdline_p)
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start < initrd_end) {
initrd_is_mapped = mem_reserve(__pa(initrd_start),
- __pa(initrd_end), 0) == 0;
+ __pa(initrd_end)) == 0;
initrd_below_start_ok = 1;
} else {
initrd_start = 0;
}
#endif
- mem_reserve(__pa(&_stext),__pa(&_end), 1);
+ mem_reserve(__pa(&_stext), __pa(&_end));
mem_reserve(__pa(&_WindowVectors_text_start),
- __pa(&_WindowVectors_text_end), 0);
+ __pa(&_WindowVectors_text_end));
mem_reserve(__pa(&_DebugInterruptVector_literal_start),
- __pa(&_DebugInterruptVector_text_end), 0);
+ __pa(&_DebugInterruptVector_text_end));
mem_reserve(__pa(&_KernelExceptionVector_literal_start),
- __pa(&_KernelExceptionVector_text_end), 0);
+ __pa(&_KernelExceptionVector_text_end));
mem_reserve(__pa(&_UserExceptionVector_literal_start),
- __pa(&_UserExceptionVector_text_end), 0);
+ __pa(&_UserExceptionVector_text_end));
mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
- __pa(&_DoubleExceptionVector_text_end), 0);
+ __pa(&_DoubleExceptionVector_text_end));
#if XCHAL_EXCM_LEVEL >= 2
mem_reserve(__pa(&_Level2InterruptVector_text_start),
- __pa(&_Level2InterruptVector_text_end), 0);
+ __pa(&_Level2InterruptVector_text_end));
#endif
#if XCHAL_EXCM_LEVEL >= 3
mem_reserve(__pa(&_Level3InterruptVector_text_start),
- __pa(&_Level3InterruptVector_text_end), 0);
+ __pa(&_Level3InterruptVector_text_end));
#endif
#if XCHAL_EXCM_LEVEL >= 4
mem_reserve(__pa(&_Level4InterruptVector_text_start),
- __pa(&_Level4InterruptVector_text_end), 0);
+ __pa(&_Level4InterruptVector_text_end));
#endif
#if XCHAL_EXCM_LEVEL >= 5
mem_reserve(__pa(&_Level5InterruptVector_text_start),
- __pa(&_Level5InterruptVector_text_end), 0);
+ __pa(&_Level5InterruptVector_text_end));
#endif
#if XCHAL_EXCM_LEVEL >= 6
mem_reserve(__pa(&_Level6InterruptVector_text_start),
- __pa(&_Level6InterruptVector_text_end), 0);
+ __pa(&_Level6InterruptVector_text_end));
#endif
#ifdef CONFIG_SMP
mem_reserve(__pa(&_SecondaryResetVector_text_start),
- __pa(&_SecondaryResetVector_text_end), 0);
+ __pa(&_SecondaryResetVector_text_end));
#endif
parse_early_param();
bootmem_init();
@@ -555,6 +538,137 @@ static int __init topology_init(void)
}
subsys_initcall(topology_init);
+void cpu_reset(void)
+{
+#if XCHAL_HAVE_PTP_MMU
+ local_irq_disable();
+ /*
+ * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
+ * be flushed.
+ * Way 4 is not currently used by linux.
+ * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
+ * Way 5 shall be flushed and way 6 shall be set to identity mapping
+ * on MMUv3.
+ */
+ local_flush_tlb_all();
+ invalidate_page_directory();
+#if XCHAL_HAVE_SPANNING_WAY
+ /* MMU v3 */
+ {
+ unsigned long vaddr = (unsigned long)cpu_reset;
+ unsigned long paddr = __pa(vaddr);
+ unsigned long tmpaddr = vaddr + SZ_512M;
+ unsigned long tmp0, tmp1, tmp2, tmp3;
+
+ /*
+ * Find a place for the temporary mapping. It must not be
+ * in the same 512MB region with vaddr or paddr, otherwise
+ * there may be multihit exception either on entry to the
+ * temporary mapping, or on entry to the identity mapping.
+ * (512MB is the biggest page size supported by TLB.)
+ */
+ while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
+ tmpaddr += SZ_512M;
+
+ /* Invalidate mapping in the selected temporary area */
+ if (itlb_probe(tmpaddr) & 0x8)
+ invalidate_itlb_entry(itlb_probe(tmpaddr));
+ if (itlb_probe(tmpaddr + PAGE_SIZE) & 0x8)
+ invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));
+
+ /*
+ * Map two consecutive pages starting at the physical address
+ * of this function to the temporary mapping area.
+ */
+ write_itlb_entry(__pte((paddr & PAGE_MASK) |
+ _PAGE_HW_VALID |
+ _PAGE_HW_EXEC |
+ _PAGE_CA_BYPASS),
+ tmpaddr & PAGE_MASK);
+ write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
+ _PAGE_HW_VALID |
+ _PAGE_HW_EXEC |
+ _PAGE_CA_BYPASS),
+ (tmpaddr & PAGE_MASK) + PAGE_SIZE);
+
+ /* Reinitialize TLB */
+ __asm__ __volatile__ ("movi %0, 1f\n\t"
+ "movi %3, 2f\n\t"
+ "add %0, %0, %4\n\t"
+ "add %3, %3, %5\n\t"
+ "jx %0\n"
+ /*
+ * No literal, data or stack access
+ * below this point
+ */
+ "1:\n\t"
+ /* Initialize *tlbcfg */
+ "movi %0, 0\n\t"
+ "wsr %0, itlbcfg\n\t"
+ "wsr %0, dtlbcfg\n\t"
+ /* Invalidate TLB way 5 */
+ "movi %0, 4\n\t"
+ "movi %1, 5\n"
+ "1:\n\t"
+ "iitlb %1\n\t"
+ "idtlb %1\n\t"
+ "add %1, %1, %6\n\t"
+ "addi %0, %0, -1\n\t"
+ "bnez %0, 1b\n\t"
+ /* Initialize TLB way 6 */
+ "movi %0, 7\n\t"
+ "addi %1, %9, 3\n\t"
+ "addi %2, %9, 6\n"
+ "1:\n\t"
+ "witlb %1, %2\n\t"
+ "wdtlb %1, %2\n\t"
+ "add %1, %1, %7\n\t"
+ "add %2, %2, %7\n\t"
+ "addi %0, %0, -1\n\t"
+ "bnez %0, 1b\n\t"
+ /* Jump to identity mapping */
+ "jx %3\n"
+ "2:\n\t"
+ /* Complete way 6 initialization */
+ "witlb %1, %2\n\t"
+ "wdtlb %1, %2\n\t"
+ /* Invalidate temporary mapping */
+ "sub %0, %9, %7\n\t"
+ "iitlb %0\n\t"
+ "add %0, %0, %8\n\t"
+ "iitlb %0"
+ : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
+ "=&a"(tmp3)
+ : "a"(tmpaddr - vaddr),
+ "a"(paddr - vaddr),
+ "a"(SZ_128M), "a"(SZ_512M),
+ "a"(PAGE_SIZE),
+ "a"((tmpaddr + SZ_512M) & PAGE_MASK)
+ : "memory");
+ }
+#endif
+#endif
+ __asm__ __volatile__ ("movi a2, 0\n\t"
+ "wsr a2, icountlevel\n\t"
+ "movi a2, 0\n\t"
+ "wsr a2, icount\n\t"
+#if XCHAL_NUM_IBREAK > 0
+ "wsr a2, ibreakenable\n\t"
+#endif
+#if XCHAL_HAVE_LOOPS
+ "wsr a2, lcount\n\t"
+#endif
+ "movi a2, 0x1f\n\t"
+ "wsr a2, ps\n\t"
+ "isync\n\t"
+ "jx %0\n\t"
+ :
+ : "a" (XCHAL_RESET_VECTOR_VADDR)
+ : "a2");
+ for (;;)
+ ;
+}
+
void machine_restart(char * cmd)
{
platform_restart();
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