Philips PNX8550 support: MIPS32-like core with 2 Trimedias on it.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/mach-pnx8550/kernel-entry-init.h b/include/asm-mips/mach-pnx8550/kernel-entry-init.h
new file mode 100644
index 0000000..57102fa
--- /dev/null
+++ b/include/asm-mips/mach-pnx8550/kernel-entry-init.h
@@ -0,0 +1,262 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Embedded Alley Solutions, Inc
+ */
+#ifndef __ASM_MACH_KERNEL_ENTRY_INIT_H
+#define __ASM_MACH_KERNEL_ENTRY_INIT_H
+
+#include <asm/cacheops.h>
+#include <asm/addrspace.h>
+
+#define CO_CONFIGPR_VALID 0x3F1F41FF /* valid bits to write to ConfigPR */
+#define HAZARD_CP0 nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;
+#define CACHE_OPC 0xBC000000 /* MIPS cache instruction opcode */
+#define ICACHE_LINE_SIZE 32 /* Instruction cache line size bytes */
+#define DCACHE_LINE_SIZE 32 /* Data cache line size in bytes */
+
+#define ICACHE_SET_COUNT 256 /* Instruction cache set count */
+#define DCACHE_SET_COUNT 128 /* Data cache set count */
+
+#define ICACHE_SET_SIZE (ICACHE_SET_COUNT * ICACHE_LINE_SIZE)
+#define DCACHE_SET_SIZE (DCACHE_SET_COUNT * DCACHE_LINE_SIZE)
+
+ .macro kernel_entry_setup
+ .set push
+ .set noreorder
+ /*
+ * PNX8550 entry point, when running a non compressed
+ * kernel. When loading a zImage, the head.S code in
+ * arch/mips/zboot/pnx8550 will init the caches and,
+ * decompress the kernel, and branch to kernel_entry.
+ */
+cache_begin: li t0, (1<<28)
+ mtc0 t0, CP0_STATUS /* cp0 usable */
+ HAZARD_CP0
+
+ mtc0 zero, CP0_CAUSE
+ HAZARD_CP0
+
+
+ /* Set static virtual to phys address translation and TLB disabled */
+ mfc0 t0, CP0_CONFIG, 7
+ HAZARD_CP0
+
+ and t0,~((1<<19) | (1<<20)) /* TLB/MAP cleared */
+ mtc0 t0, CP0_CONFIG, 7
+ HAZARD_CP0
+
+ /* CPU boots with kseg0 cache algo set to 0x2 -- uncached */
+
+ init_icache
+ nop
+ init_dcache
+ nop
+
+ cachePr4450ICReset
+ nop
+
+ cachePr4450DCReset
+ nop
+
+ /* read ConfigPR into t0 */
+ mfc0 t0, CP0_CONFIG, 7
+ HAZARD_CP0
+
+ /* enable the TLB */
+ or t0, (1<<19)
+
+ /* disable the ICACHE: at least 10x slower */
+ /* or t0, (1<<26) */
+
+ /* disable the DCACHE; CONFIG_CPU_HAS_LLSC should not be set */
+ /* or t0, (1<<27) */
+
+ and t0, CO_CONFIGPR_VALID
+
+ /* enable TLB. */
+ mtc0 t0, CP0_CONFIG, 7
+ HAZARD_CP0
+cache_end:
+ /* Setup CMEM_0 to MMIO address space, 2MB */
+ lui t0, 0x1BE0
+ addi t0, t0, 0x3
+ mtc0 $8, $22, 4
+ nop
+
+ /* Setup CMEM_1, 128MB */
+ lui t0, 0x1000
+ addi t0, t0, 0xf
+ mtc0 $8, $22, 5
+ nop
+
+
+ /* Setup CMEM_2, 32MB */
+ lui t0, 0x1C00
+ addi t0, t0, 0xb
+ mtc0 $8, $22, 6
+ nop
+
+ /* Setup CMEM_3, 0MB */
+ lui t0, 0x0
+ addi t0, t0, 0x0
+ mtc0 $8, $22, 7
+ nop
+
+ /* Enable cache */
+ mfc0 t0, CP0_CONFIG
+ HAZARD_CP0
+ and t0, t0, 0xFFFFFFF8
+ or t0, t0, 3
+ mtc0 t0, CP0_CONFIG
+ HAZARD_CP0
+ .set pop
+ .endm
+
+ .macro init_icache
+ .set push
+ .set noreorder
+
+ /* Get Cache Configuration */
+ mfc0 t3, CP0_CONFIG, 1
+ HAZARD_CP0
+
+ /* get cache Line size */
+
+ srl t1, t3, 19 /* C0_CONFIGPR_IL_SHIFT */
+ andi t1, t1, 0x7 /* C0_CONFIGPR_IL_MASK */
+ beq t1, zero, pr4450_instr_cache_invalidated /* if zero instruction cache is absent */
+ nop
+ addiu t0, t1, 1
+ ori t1, zero, 1
+ sllv t1, t1, t0
+
+ /* get max cache Index */
+ srl t2, t3, 22 /* C0_CONFIGPR_IS_SHIFT */
+ andi t2, t2, 0x7 /* C0_CONFIGPR_IS_MASK */
+ addiu t0, t2, 6
+ ori t2, zero, 1
+ sllv t2, t2, t0
+
+ /* get max cache way */
+ srl t3, t3, 16 /* C0_CONFIGPR_IA_SHIFT */
+ andi t3, t3, 0x7 /* C0_CONFIGPR_IA_MASK */
+ addiu t3, t3, 1
+
+ /* total no of cache lines */
+ multu t2, t3 /* max index * max way */
+ mflo t2
+ addiu t2, t2, -1
+
+ move t0, zero
+pr4450_next_instruction_cache_set:
+ cache Index_Invalidate_I, 0(t0)
+ addu t0, t0, t1 /* add bytes in a line */
+ bne t2, zero, pr4450_next_instruction_cache_set
+ addiu t2, t2, -1 /* reduce no of lines to invalidate by one */
+pr4450_instr_cache_invalidated:
+ .set pop
+ .endm
+
+ .macro init_dcache
+ .set push
+ .set noreorder
+ move t1, zero
+
+ /* Store Tag Information */
+ mtc0 zero, CP0_TAGLO, 0
+ HAZARD_CP0
+
+ mtc0 zero, CP0_TAGHI, 0
+ HAZARD_CP0
+
+ /* Cache size is 16384 = 512 lines x 32 bytes per line */
+ or t2, zero, (128*4)-1 /* 512 lines */
+ /* Invalidate all lines */
+2:
+ cache Index_Store_Tag_D, 0(t1)
+ addiu t2, t2, -1
+ bne t2, zero, 2b
+ addiu t1, t1, 32 /* 32 bytes in a line */
+ .set pop
+ .endm
+
+ .macro cachePr4450ICReset
+ .set push
+ .set noreorder
+
+ /* Save CP0 status reg on entry; */
+ /* disable interrupts during cache reset */
+ mfc0 t0, CP0_STATUS /* T0 = interrupt status on entry */
+ HAZARD_CP0
+
+ mtc0 zero, CP0_STATUS /* disable CPU interrupts */
+ HAZARD_CP0
+
+ or t1, zero, zero /* T1 = starting cache index (0) */
+ ori t2, zero, (256 - 1) /* T2 = inst cache set cnt - 1 */
+
+ icache_invd_loop:
+ /* 9 == register t1 */
+ .word (CACHE_OPC | (9 << 21) | (Index_Invalidate_I << 16) | \
+ (0 * ICACHE_SET_SIZE)) /* invalidate inst cache WAY0 */
+ .word (CACHE_OPC | (9 << 21) | (Index_Invalidate_I << 16) | \
+ (1 * ICACHE_SET_SIZE)) /* invalidate inst cache WAY1 */
+
+ addiu t1, t1, ICACHE_LINE_SIZE /* T1 = next cache line index */
+ bne t2, zero, icache_invd_loop /* T2 = 0 if all sets invalidated */
+ addiu t2, t2, -1 /* decrement T2 set cnt (delay slot) */
+
+ /* Initialize the latches in the instruction cache tag */
+ /* that drive the way selection tri-state bus drivers, by doing a */
+ /* dummy load while the instruction cache is still disabled. */
+ /* TODO: Is this needed ? */
+ la t1, KSEG0 /* T1 = cached memory base address */
+ lw zero, 0x0000(t1) /* (dummy read of first memory word) */
+
+ mtc0 t0, CP0_STATUS /* restore interrupt status on entry */
+ HAZARD_CP0
+ .set pop
+ .endm
+
+ .macro cachePr4450DCReset
+ .set push
+ .set noreorder
+ mfc0 t0, CP0_STATUS /* T0 = interrupt status on entry */
+ HAZARD_CP0
+ mtc0 zero, CP0_STATUS /* disable CPU interrupts */
+ HAZARD_CP0
+
+ /* Writeback/invalidate entire data cache sets/ways/lines */
+ or t1, zero, zero /* T1 = starting cache index (0) */
+ ori t2, zero, (DCACHE_SET_COUNT - 1) /* T2 = data cache set cnt - 1 */
+
+ dcache_wbinvd_loop:
+ /* 9 == register t1 */
+ .word (CACHE_OPC | (9 << 21) | (Index_Writeback_Inv_D << 16) | \
+ (0 * DCACHE_SET_SIZE)) /* writeback/invalidate WAY0 */
+ .word (CACHE_OPC | (9 << 21) | (Index_Writeback_Inv_D << 16) | \
+ (1 * DCACHE_SET_SIZE)) /* writeback/invalidate WAY1 */
+ .word (CACHE_OPC | (9 << 21) | (Index_Writeback_Inv_D << 16) | \
+ (2 * DCACHE_SET_SIZE)) /* writeback/invalidate WAY2 */
+ .word (CACHE_OPC | (9 << 21) | (Index_Writeback_Inv_D << 16) | \
+ (3 * DCACHE_SET_SIZE)) /* writeback/invalidate WAY3 */
+
+ addiu t1, t1, DCACHE_LINE_SIZE /* T1 = next data cache line index */
+ bne t2, zero, dcache_wbinvd_loop /* T2 = 0 when wbinvd entire cache */
+ addiu t2, t2, -1 /* decrement T2 set cnt (delay slot) */
+
+ /* Initialize the latches in the data cache tag that drive the way
+ selection tri-state bus drivers, by doing a dummy load while the
+ data cache is still in the disabled mode. TODO: Is this needed ? */
+ la t1, KSEG0 /* T1 = cached memory base address */
+ lw zero, 0x0000(t1) /* (dummy read of first memory word) */
+
+ mtc0 t0, CP0_STATUS /* restore interrupt status on entry */
+ HAZARD_CP0
+ .set pop
+ .endm
+
+#endif /* __ASM_MACH_KERNEL_ENTRY_INIT_H */