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Linux/arch/arm/mach-spear/spear13xx.c

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  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 }
129 

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