1 /*
2 * OMAP4 specific common source file.
3 *
4 * Copyright (C) 2010 Texas Instruments, Inc.
5 * Author:
6 * Santosh Shilimkar <santosh.shilimkar@ti.com>
7 *
8 *
9 * This program is free software,you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/io.h>
17 #include <linux/irq.h>
18 #include <linux/irqchip.h>
19 #include <linux/platform_device.h>
20 #include <linux/memblock.h>
21 #include <linux/of_irq.h>
22 #include <linux/of_platform.h>
23 #include <linux/export.h>
24 #include <linux/irqchip/arm-gic.h>
25 #include <linux/irqchip/irq-crossbar.h>
26 #include <linux/of_address.h>
27 #include <linux/reboot.h>
28 #include <linux/genalloc.h>
29
30 #include <asm/hardware/cache-l2x0.h>
31 #include <asm/mach/map.h>
32 #include <asm/memblock.h>
33 #include <asm/smp_twd.h>
34
35 #include "omap-wakeupgen.h"
36 #include "soc.h"
37 #include "iomap.h"
38 #include "common.h"
39 #include "mmc.h"
40 #include "prminst44xx.h"
41 #include "prcm_mpu44xx.h"
42 #include "omap4-sar-layout.h"
43 #include "omap-secure.h"
44 #include "sram.h"
45
46 #ifdef CONFIG_CACHE_L2X0
47 static void __iomem *l2cache_base;
48 #endif
49
50 static void __iomem *sar_ram_base;
51 static void __iomem *gic_dist_base_addr;
52 static void __iomem *twd_base;
53
54 #define IRQ_LOCALTIMER 29
55
56 #ifdef CONFIG_OMAP4_ERRATA_I688
57 /* Used to implement memory barrier on DRAM path */
58 #define OMAP4_DRAM_BARRIER_VA 0xfe600000
59
60 void __iomem *dram_sync, *sram_sync;
61
62 static phys_addr_t paddr;
63 static u32 size;
64
omap_bus_sync(void)65 void omap_bus_sync(void)
66 {
67 if (dram_sync && sram_sync) {
68 writel_relaxed(readl_relaxed(dram_sync), dram_sync);
69 writel_relaxed(readl_relaxed(sram_sync), sram_sync);
70 isb();
71 }
72 }
73 EXPORT_SYMBOL(omap_bus_sync);
74
omap4_sram_init(void)75 static int __init omap4_sram_init(void)
76 {
77 struct device_node *np;
78 struct gen_pool *sram_pool;
79
80 np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
81 if (!np)
82 pr_warn("%s:Unable to allocate sram needed to handle errata I688\n",
83 __func__);
84 sram_pool = of_get_named_gen_pool(np, "sram", 0);
85 if (!sram_pool)
86 pr_warn("%s:Unable to get sram pool needed to handle errata I688\n",
87 __func__);
88 else
89 sram_sync = (void *)gen_pool_alloc(sram_pool, PAGE_SIZE);
90
91 return 0;
92 }
93 omap_arch_initcall(omap4_sram_init);
94
95 /* Steal one page physical memory for barrier implementation */
omap_barrier_reserve_memblock(void)96 int __init omap_barrier_reserve_memblock(void)
97 {
98
99 size = ALIGN(PAGE_SIZE, SZ_1M);
100 paddr = arm_memblock_steal(size, SZ_1M);
101
102 return 0;
103 }
104
omap_barriers_init(void)105 void __init omap_barriers_init(void)
106 {
107 struct map_desc dram_io_desc[1];
108
109 dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
110 dram_io_desc[0].pfn = __phys_to_pfn(paddr);
111 dram_io_desc[0].length = size;
112 dram_io_desc[0].type = MT_MEMORY_RW_SO;
113 iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc));
114 dram_sync = (void __iomem *) dram_io_desc[0].virtual;
115
116 pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n",
117 (long long) paddr, dram_io_desc[0].virtual);
118
119 }
120 #else
omap_barriers_init(void)121 void __init omap_barriers_init(void)
122 {}
123 #endif
124
gic_dist_disable(void)125 void gic_dist_disable(void)
126 {
127 if (gic_dist_base_addr)
128 writel_relaxed(0x0, gic_dist_base_addr + GIC_DIST_CTRL);
129 }
130
gic_dist_enable(void)131 void gic_dist_enable(void)
132 {
133 if (gic_dist_base_addr)
134 writel_relaxed(0x1, gic_dist_base_addr + GIC_DIST_CTRL);
135 }
136
gic_dist_disabled(void)137 bool gic_dist_disabled(void)
138 {
139 return !(readl_relaxed(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1);
140 }
141
gic_timer_retrigger(void)142 void gic_timer_retrigger(void)
143 {
144 u32 twd_int = readl_relaxed(twd_base + TWD_TIMER_INTSTAT);
145 u32 gic_int = readl_relaxed(gic_dist_base_addr + GIC_DIST_PENDING_SET);
146 u32 twd_ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL);
147
148 if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) {
149 /*
150 * The local timer interrupt got lost while the distributor was
151 * disabled. Ack the pending interrupt, and retrigger it.
152 */
153 pr_warn("%s: lost localtimer interrupt\n", __func__);
154 writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT);
155 if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) {
156 writel_relaxed(1, twd_base + TWD_TIMER_COUNTER);
157 twd_ctrl |= TWD_TIMER_CONTROL_ENABLE;
158 writel_relaxed(twd_ctrl, twd_base + TWD_TIMER_CONTROL);
159 }
160 }
161 }
162
163 #ifdef CONFIG_CACHE_L2X0
164
omap4_get_l2cache_base(void)165 void __iomem *omap4_get_l2cache_base(void)
166 {
167 return l2cache_base;
168 }
169
omap4_l2c310_write_sec(unsigned long val,unsigned reg)170 static void omap4_l2c310_write_sec(unsigned long val, unsigned reg)
171 {
172 unsigned smc_op;
173
174 switch (reg) {
175 case L2X0_CTRL:
176 smc_op = OMAP4_MON_L2X0_CTRL_INDEX;
177 break;
178
179 case L2X0_AUX_CTRL:
180 smc_op = OMAP4_MON_L2X0_AUXCTRL_INDEX;
181 break;
182
183 case L2X0_DEBUG_CTRL:
184 smc_op = OMAP4_MON_L2X0_DBG_CTRL_INDEX;
185 break;
186
187 case L310_PREFETCH_CTRL:
188 smc_op = OMAP4_MON_L2X0_PREFETCH_INDEX;
189 break;
190
191 case L310_POWER_CTRL:
192 pr_info_once("OMAP L2C310: ROM does not support power control setting\n");
193 return;
194
195 default:
196 WARN_ONCE(1, "OMAP L2C310: ignoring write to reg 0x%x\n", reg);
197 return;
198 }
199
200 omap_smc1(smc_op, val);
201 }
202
omap_l2_cache_init(void)203 int __init omap_l2_cache_init(void)
204 {
205 u32 aux_ctrl;
206
207 /* Static mapping, never released */
208 l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
209 if (WARN_ON(!l2cache_base))
210 return -ENOMEM;
211
212 /* 16-way associativity, parity disabled, way size - 64KB (es2.0 +) */
213 aux_ctrl = L2C_AUX_CTRL_SHARED_OVERRIDE |
214 L310_AUX_CTRL_DATA_PREFETCH |
215 L310_AUX_CTRL_INSTR_PREFETCH;
216
217 outer_cache.write_sec = omap4_l2c310_write_sec;
218 if (of_have_populated_dt())
219 l2x0_of_init(aux_ctrl, 0xcf9fffff);
220 else
221 l2x0_init(l2cache_base, aux_ctrl, 0xcf9fffff);
222
223 return 0;
224 }
225 #endif
226
omap4_get_sar_ram_base(void)227 void __iomem *omap4_get_sar_ram_base(void)
228 {
229 return sar_ram_base;
230 }
231
232 /*
233 * SAR RAM used to save and restore the HW
234 * context in low power modes
235 */
omap4_sar_ram_init(void)236 static int __init omap4_sar_ram_init(void)
237 {
238 unsigned long sar_base;
239
240 /*
241 * To avoid code running on other OMAPs in
242 * multi-omap builds
243 */
244 if (cpu_is_omap44xx())
245 sar_base = OMAP44XX_SAR_RAM_BASE;
246 else if (soc_is_omap54xx())
247 sar_base = OMAP54XX_SAR_RAM_BASE;
248 else
249 return -ENOMEM;
250
251 /* Static mapping, never released */
252 sar_ram_base = ioremap(sar_base, SZ_16K);
253 if (WARN_ON(!sar_ram_base))
254 return -ENOMEM;
255
256 return 0;
257 }
258 omap_early_initcall(omap4_sar_ram_init);
259
omap_gic_of_init(void)260 void __init omap_gic_of_init(void)
261 {
262 struct device_node *np;
263
264 /* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */
265 if (!cpu_is_omap446x())
266 goto skip_errata_init;
267
268 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
269 gic_dist_base_addr = of_iomap(np, 0);
270 WARN_ON(!gic_dist_base_addr);
271
272 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer");
273 twd_base = of_iomap(np, 0);
274 WARN_ON(!twd_base);
275
276 skip_errata_init:
277 omap_wakeupgen_init();
278 #ifdef CONFIG_IRQ_CROSSBAR
279 irqcrossbar_init();
280 #endif
281 irqchip_init();
282 }
283