1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
3 * Copyright (c) 2018 Microsemi Corporation
8 #include <asm/global_data.h>
9 #include <linux/bitops.h>
12 #include <asm/types.h>
13 #include <asm/mipsregs.h>
18 DECLARE_GLOBAL_DATA_PTR;
20 #if CFG_SYS_SDRAM_SIZE <= SZ_64M
21 #define MSCC_RAM_TLB_SIZE SZ_64M
22 #define MSCC_ATTRIB2 MMU_REGIO_INVAL
23 #elif CFG_SYS_SDRAM_SIZE <= SZ_128M
24 #define MSCC_RAM_TLB_SIZE SZ_64M
25 #define MSCC_ATTRIB2 MMU_REGIO_RW
26 #elif CFG_SYS_SDRAM_SIZE <= SZ_256M
27 #define MSCC_RAM_TLB_SIZE SZ_256M
28 #define MSCC_ATTRIB2 MMU_REGIO_INVAL
29 #elif CFG_SYS_SDRAM_SIZE <= SZ_512M
30 #define MSCC_RAM_TLB_SIZE SZ_256M
31 #define MSCC_ATTRIB2 MMU_REGIO_RW
33 #define MSCC_RAM_TLB_SIZE SZ_512M
34 #define MSCC_ATTRIB2 MMU_REGIO_RW
37 /* NOTE: lowlevel_init() function does not have access to the
38 * stack. Thus, all called functions must be inlined, and (any) local
39 * variables must be kept in registers.
41 void vcoreiii_tlb_init(void)
43 register int tlbix = 0;
46 * Unlike most of the MIPS based SoCs, the IO register address
47 * are not in KSEG0. The mainline linux kernel built in legacy
48 * mode needs to access some of the registers very early in
49 * the boot and make the assumption that the bootloader has
50 * already configured them, so we have to match this
53 create_tlb(tlbix++, MSCC_IO_ORIGIN1_OFFSET, SZ_16M, MMU_REGIO_RW,
55 #ifdef CONFIG_SOC_LUTON
56 create_tlb(tlbix++, MSCC_IO_ORIGIN2_OFFSET, SZ_16M, MMU_REGIO_RW,
61 * If U-Boot is located in NOR then we want to be able to use
62 * the data cache in order to boot in a decent duration
64 create_tlb(tlbix++, MSCC_FLASH_TO, SZ_16M, MMU_REGIO_RO_C,
66 create_tlb(tlbix++, MSCC_FLASH_TO + SZ_32M, SZ_16M, MMU_REGIO_RO_C,
70 * Using cache for RAM also helps to improve boot time. Thanks
71 * to this the time to relocate U-Boot in RAM went from 2.092
74 create_tlb(tlbix++, MSCC_DDR_TO, MSCC_RAM_TLB_SIZE, MMU_REGIO_RW,
77 /* Enable mapping (using TLB) kuseg by clearing the bit ERL,
78 * which is set on reset.
80 write_c0_status(read_c0_status() & ~ST0_ERL);
83 int mach_cpu_init(void)
85 /* Speed up NOR flash access */
86 #ifdef CONFIG_SOC_LUTON
87 writel(ICPU_PI_MST_CFG_TRISTATE_CTRL +
88 ICPU_PI_MST_CFG_CLK_DIV(4), BASE_CFG + ICPU_PI_MST_CFG);
90 writel(ICPU_SPI_MST_CFG_FAST_READ_ENA +
91 ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
92 ICPU_SPI_MST_CFG_CLK_DIV(9), BASE_CFG + ICPU_SPI_MST_CFG);
94 #if defined(CONFIG_SOC_OCELOT) || defined(CONFIG_SOC_SERVAL)
95 writel(ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
96 ICPU_SPI_MST_CFG_CLK_DIV(9), BASE_CFG + ICPU_SPI_MST_CFG);
98 #if defined(CONFIG_SOC_JR2) || defined(CONFIG_SOC_SERVALT)
99 writel(ICPU_SPI_MST_CFG_FAST_READ_ENA +
100 ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
101 ICPU_SPI_MST_CFG_CLK_DIV(14), BASE_CFG + ICPU_SPI_MST_CFG);
104 * Legacy and mainline linux kernel expect that the
105 * interruption map was set as it was done by redboot.
107 writel(~0, BASE_CFG + ICPU_DST_INTR_MAP(0));
108 writel(0, BASE_CFG + ICPU_DST_INTR_MAP(1));
109 writel(0, BASE_CFG + ICPU_DST_INTR_MAP(2));
110 writel(0, BASE_CFG + ICPU_DST_INTR_MAP(3));