1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
2 /*
3 * Copyright (c) 2018 Microsemi Corporation
4 */
5
6 #include <common.h>
7
8 #include <asm/io.h>
9 #include <asm/types.h>
10
11 #include <mach/tlb.h>
12 #include <mach/ddr.h>
13
14 DECLARE_GLOBAL_DATA_PTR;
15
16 #if CONFIG_SYS_SDRAM_SIZE <= SZ_64M
17 #define MSCC_RAM_TLB_SIZE SZ_64M
18 #define MSCC_ATTRIB2 MMU_REGIO_INVAL
19 #elif CONFIG_SYS_SDRAM_SIZE <= SZ_128M
20 #define MSCC_RAM_TLB_SIZE SZ_64M
21 #define MSCC_ATTRIB2 MMU_REGIO_RW
22 #elif CONFIG_SYS_SDRAM_SIZE <= SZ_256M
23 #define MSCC_RAM_TLB_SIZE SZ_256M
24 #define MSCC_ATTRIB2 MMU_REGIO_INVAL
25 #elif CONFIG_SYS_SDRAM_SIZE <= SZ_512M
26 #define MSCC_RAM_TLB_SIZE SZ_256M
27 #define MSCC_ATTRIB2 MMU_REGIO_RW
28 #else
29 #define MSCC_RAM_TLB_SIZE SZ_512M
30 #define MSCC_ATTRIB2 MMU_REGIO_RW
31 #endif
32
33 /* NOTE: lowlevel_init() function does not have access to the
34 * stack. Thus, all called functions must be inlined, and (any) local
35 * variables must be kept in registers.
36 */
vcoreiii_tlb_init(void)37 void vcoreiii_tlb_init(void)
38 {
39 register int tlbix = 0;
40
41 /*
42 * Unlike most of the MIPS based SoCs, the IO register address
43 * are not in KSEG0. The mainline linux kernel built in legacy
44 * mode needs to access some of the registers very early in
45 * the boot and make the assumption that the bootloader has
46 * already configured them, so we have to match this
47 * expectation.
48 */
49 create_tlb(tlbix++, MSCC_IO_ORIGIN1_OFFSET, SZ_16M, MMU_REGIO_RW,
50 MMU_REGIO_RW);
51 #ifdef CONFIG_SOC_LUTON
52 create_tlb(tlbix++, MSCC_IO_ORIGIN2_OFFSET, SZ_16M, MMU_REGIO_RW,
53 MMU_REGIO_RW);
54 #endif
55
56 #if CONFIG_SYS_TEXT_BASE == MSCC_FLASH_TO
57 /*
58 * If U-Boot is located in NOR then we want to be able to use
59 * the data cache in order to boot in a decent duration
60 */
61 create_tlb(tlbix++, MSCC_FLASH_TO, SZ_16M, MMU_REGIO_RO_C,
62 MMU_REGIO_RO_C);
63 create_tlb(tlbix++, MSCC_FLASH_TO + SZ_32M, SZ_16M, MMU_REGIO_RO_C,
64 MMU_REGIO_RO_C);
65
66 /*
67 * Using cache for RAM also helps to improve boot time. Thanks
68 * to this the time to relocate U-Boot in RAM went from 2.092
69 * secs to 0.104 secs.
70 */
71 create_tlb(tlbix++, MSCC_DDR_TO, MSCC_RAM_TLB_SIZE, MMU_REGIO_RW,
72 MSCC_ATTRIB2);
73
74 /* Enable caches by clearing the bit ERL, which is set on reset */
75 write_c0_status(read_c0_status() & ~BIT(2));
76 #endif /* CONFIG_SYS_TEXT_BASE */
77 }
78
mach_cpu_init(void)79 int mach_cpu_init(void)
80 {
81 /* Speed up NOR flash access */
82 #ifdef CONFIG_SOC_LUTON
83 writel(ICPU_PI_MST_CFG_TRISTATE_CTRL +
84 ICPU_PI_MST_CFG_CLK_DIV(4), BASE_CFG + ICPU_PI_MST_CFG);
85
86 writel(ICPU_SPI_MST_CFG_FAST_READ_ENA +
87 ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
88 ICPU_SPI_MST_CFG_CLK_DIV(9), BASE_CFG + ICPU_SPI_MST_CFG);
89 #else
90 #if defined(CONFIG_SOC_OCELOT) || defined(CONFIG_SOC_SERVAL)
91 writel(ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
92 ICPU_SPI_MST_CFG_CLK_DIV(9), BASE_CFG + ICPU_SPI_MST_CFG);
93 #endif
94 #if defined(CONFIG_SOC_JR2) || defined(CONFIG_SOC_SERVALT)
95 writel(ICPU_SPI_MST_CFG_FAST_READ_ENA +
96 ICPU_SPI_MST_CFG_CS_DESELECT_TIME(0x19) +
97 ICPU_SPI_MST_CFG_CLK_DIV(14), BASE_CFG + ICPU_SPI_MST_CFG);
98 #endif
99 /*
100 * Legacy and mainline linux kernel expect that the
101 * interruption map was set as it was done by redboot.
102 */
103 writel(~0, BASE_CFG + ICPU_DST_INTR_MAP(0));
104 writel(0, BASE_CFG + ICPU_DST_INTR_MAP(1));
105 writel(0, BASE_CFG + ICPU_DST_INTR_MAP(2));
106 writel(0, BASE_CFG + ICPU_DST_INTR_MAP(3));
107 #endif
108 return 0;
109 }
110