| 1 | /* |
| 2 | * arch/arm/mach-spear13xx/spear13xx.c |
| 3 | * |
| 4 | * SPEAr13XX machines common source file |
| 5 | * |
| 6 | * Copyright (C) 2012 ST Microelectronics |
| 7 | * Viresh Kumar <vireshk@kernel.org> |
| 8 | * |
| 9 | * This file is licensed under the terms of the GNU General Public |
| 10 | * License version 2. This program is licensed "as is" without any |
| 11 | * warranty of any kind, whether express or implied. |
| 12 | */ |
| 13 | |
| 14 | #define pr_fmt(fmt) "SPEAr13xx: " fmt |
| 15 | |
| 16 | #include <linux/amba/pl022.h> |
| 17 | #include <linux/clk.h> |
| 18 | #include <linux/clocksource.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/of.h> |
| 21 | #include <asm/hardware/cache-l2x0.h> |
| 22 | #include <asm/mach/map.h> |
| 23 | #include <mach/spear.h> |
| 24 | #include "generic.h" |
| 25 | |
| 26 | void __init spear13xx_l2x0_init(void) |
| 27 | { |
| 28 | /* |
| 29 | * 512KB (64KB/way), 8-way associativity, parity supported |
| 30 | * |
| 31 | * FIXME: 9th bit, of Auxillary Controller register must be set |
| 32 | * for some spear13xx devices for stable L2 operation. |
| 33 | * |
| 34 | * Enable Early BRESP, L2 prefetch for Instruction and Data, |
| 35 | * write alloc and 'Full line of zero' options |
| 36 | * |
| 37 | */ |
| 38 | if (!IS_ENABLED(CONFIG_CACHE_L2X0)) |
| 39 | return; |
| 40 | |
| 41 | writel_relaxed(0x06, VA_L2CC_BASE + L310_PREFETCH_CTRL); |
| 42 | |
| 43 | /* |
| 44 | * Program following latencies in order to make |
| 45 | * SPEAr1340 work at 600 MHz |
| 46 | */ |
| 47 | writel_relaxed(0x221, VA_L2CC_BASE + L310_TAG_LATENCY_CTRL); |
| 48 | writel_relaxed(0x441, VA_L2CC_BASE + L310_DATA_LATENCY_CTRL); |
| 49 | l2x0_init(VA_L2CC_BASE, 0x30a00001, 0xfe0fffff); |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | * Following will create 16MB static virtual/physical mappings |
| 54 | * PHYSICAL VIRTUAL |
| 55 | * 0xB3000000 0xF9000000 |
| 56 | * 0xE0000000 0xFD000000 |
| 57 | * 0xEC000000 0xFC000000 |
| 58 | * 0xED000000 0xFB000000 |
| 59 | */ |
| 60 | static struct map_desc spear13xx_io_desc[] __initdata = { |
| 61 | { |
| 62 | .virtual = (unsigned long)VA_PERIP_GRP2_BASE, |
| 63 | .pfn = __phys_to_pfn(PERIP_GRP2_BASE), |
| 64 | .length = SZ_16M, |
| 65 | .type = MT_DEVICE |
| 66 | }, { |
| 67 | .virtual = (unsigned long)VA_PERIP_GRP1_BASE, |
| 68 | .pfn = __phys_to_pfn(PERIP_GRP1_BASE), |
| 69 | .length = SZ_16M, |
| 70 | .type = MT_DEVICE |
| 71 | }, { |
| 72 | .virtual = (unsigned long)VA_A9SM_AND_MPMC_BASE, |
| 73 | .pfn = __phys_to_pfn(A9SM_AND_MPMC_BASE), |
| 74 | .length = SZ_16M, |
| 75 | .type = MT_DEVICE |
| 76 | }, { |
| 77 | .virtual = (unsigned long)VA_L2CC_BASE, |
| 78 | .pfn = __phys_to_pfn(L2CC_BASE), |
| 79 | .length = SZ_4K, |
| 80 | .type = MT_DEVICE |
| 81 | }, |
| 82 | }; |
| 83 | |
| 84 | /* This will create static memory mapping for selected devices */ |
| 85 | void __init spear13xx_map_io(void) |
| 86 | { |
| 87 | iotable_init(spear13xx_io_desc, ARRAY_SIZE(spear13xx_io_desc)); |
| 88 | } |
| 89 | |
| 90 | static void __init spear13xx_clk_init(void) |
| 91 | { |
| 92 | if (of_machine_is_compatible("st,spear1310")) |
| 93 | spear1310_clk_init(VA_MISC_BASE, VA_SPEAR1310_RAS_BASE); |
| 94 | else if (of_machine_is_compatible("st,spear1340")) |
| 95 | spear1340_clk_init(VA_MISC_BASE); |
| 96 | else |
| 97 | pr_err("%s: Unknown machine\n", __func__); |
| 98 | } |
| 99 | |
| 100 | void __init spear13xx_timer_init(void) |
| 101 | { |
| 102 | char pclk_name[] = "osc_24m_clk"; |
| 103 | struct clk *gpt_clk, *pclk; |
| 104 | |
| 105 | spear13xx_clk_init(); |
| 106 | |
| 107 | /* get the system timer clock */ |
| 108 | gpt_clk = clk_get_sys("gpt0", NULL); |
| 109 | if (IS_ERR(gpt_clk)) { |
| 110 | pr_err("%s:couldn't get clk for gpt\n", __func__); |
| 111 | BUG(); |
| 112 | } |
| 113 | |
| 114 | /* get the suitable parent clock for timer*/ |
| 115 | pclk = clk_get(NULL, pclk_name); |
| 116 | if (IS_ERR(pclk)) { |
| 117 | pr_err("%s:couldn't get %s as parent for gpt\n", __func__, |
| 118 | pclk_name); |
| 119 | BUG(); |
| 120 | } |
| 121 | |
| 122 | clk_set_parent(gpt_clk, pclk); |
| 123 | clk_put(gpt_clk); |
| 124 | clk_put(pclk); |
| 125 | |
| 126 | spear_setup_of_timer(); |
| 127 | clocksource_probe(); |
| 128 | } |