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/of_address.h>
26 #include <linux/reboot.h>
27 #include <linux/genalloc.h>
28
29 #include <asm/hardware/cache-l2x0.h>
30 #include <asm/mach/map.h>
31 #include <asm/memblock.h>
32 #include <asm/smp_twd.h>
33
34 #include "omap-wakeupgen.h"
35 #include "soc.h"
36 #include "iomap.h"
37 #include "common.h"
38 #include "prminst44xx.h"
39 #include "prcm_mpu44xx.h"
40 #include "omap4-sar-layout.h"
41 #include "omap-secure.h"
42 #include "sram.h"
43
44 #ifdef CONFIG_CACHE_L2X0
45 static void __iomem *l2cache_base;
46 #endif
47
48 static void __iomem *sar_ram_base;
49 static void __iomem *gic_dist_base_addr;
50 static void __iomem *twd_base;
51
52 #define IRQ_LOCALTIMER 29
53
54 #ifdef CONFIG_OMAP_INTERCONNECT_BARRIER
55
56 /* Used to implement memory barrier on DRAM path */
57 #define OMAP4_DRAM_BARRIER_VA 0xfe600000
58
59 static void __iomem *dram_sync, *sram_sync;
60 static phys_addr_t dram_sync_paddr;
61 static u32 dram_sync_size;
62
63 /*
64 * The OMAP4 bus structure contains asynchronous bridges which can buffer
65 * data writes from the MPU. These asynchronous bridges can be found on
66 * paths between the MPU to EMIF, and the MPU to L3 interconnects.
67 *
68 * We need to be careful about re-ordering which can happen as a result
69 * of different accesses being performed via different paths, and
70 * therefore different asynchronous bridges.
71 */
72
73 /*
74 * OMAP4 interconnect barrier which is called for each mb() and wmb().
75 * This is to ensure that normal paths to DRAM (normal memory, cacheable
76 * accesses) are properly synchronised with writes to DMA coherent memory
77 * (normal memory, uncacheable) and device writes.
78 *
79 * The mb() and wmb() barriers only operate only on the MPU->MA->EMIF
80 * path, as we need to ensure that data is visible to other system
81 * masters prior to writes to those system masters being seen.
82 *
83 * Note: the SRAM path is not synchronised via mb() and wmb().
84 */
omap4_mb(void)85 static void omap4_mb(void)
86 {
87 if (dram_sync)
88 writel_relaxed(0, dram_sync);
89 }
90
91 /*
92 * OMAP4 Errata i688 - asynchronous bridge corruption when entering WFI.
93 *
94 * If a data is stalled inside asynchronous bridge because of back
95 * pressure, it may be accepted multiple times, creating pointer
96 * misalignment that will corrupt next transfers on that data path until
97 * next reset of the system. No recovery procedure once the issue is hit,
98 * the path remains consistently broken.
99 *
100 * Async bridges can be found on paths between MPU to EMIF and MPU to L3
101 * interconnects.
102 *
103 * This situation can happen only when the idle is initiated by a Master
104 * Request Disconnection (which is trigged by software when executing WFI
105 * on the CPU).
106 *
107 * The work-around for this errata needs all the initiators connected
108 * through an async bridge to ensure that data path is properly drained
109 * before issuing WFI. This condition will be met if one Strongly ordered
110 * access is performed to the target right before executing the WFI.
111 *
112 * In MPU case, L3 T2ASYNC FIFO and DDR T2ASYNC FIFO needs to be drained.
113 * IO barrier ensure that there is no synchronisation loss on initiators
114 * operating on both interconnect port simultaneously.
115 *
116 * This is a stronger version of the OMAP4 memory barrier below, and
117 * operates on both the MPU->MA->EMIF path but also the MPU->OCP path
118 * as well, and is necessary prior to executing a WFI.
119 */
omap_interconnect_sync(void)120 void omap_interconnect_sync(void)
121 {
122 if (dram_sync && sram_sync) {
123 writel_relaxed(readl_relaxed(dram_sync), dram_sync);
124 writel_relaxed(readl_relaxed(sram_sync), sram_sync);
125 isb();
126 }
127 }
128
omap4_sram_init(void)129 static int __init omap4_sram_init(void)
130 {
131 struct device_node *np;
132 struct gen_pool *sram_pool;
133
134 np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
135 if (!np)
136 pr_warn("%s:Unable to allocate sram needed to handle errata I688\n",
137 __func__);
138 sram_pool = of_gen_pool_get(np, "sram", 0);
139 if (!sram_pool)
140 pr_warn("%s:Unable to get sram pool needed to handle errata I688\n",
141 __func__);
142 else
143 sram_sync = (void *)gen_pool_alloc(sram_pool, PAGE_SIZE);
144
145 return 0;
146 }
147 omap_arch_initcall(omap4_sram_init);
148
149 /* Steal one page physical memory for barrier implementation */
omap_barrier_reserve_memblock(void)150 void __init omap_barrier_reserve_memblock(void)
151 {
152 dram_sync_size = ALIGN(PAGE_SIZE, SZ_1M);
153 dram_sync_paddr = arm_memblock_steal(dram_sync_size, SZ_1M);
154 }
155
omap_barriers_init(void)156 void __init omap_barriers_init(void)
157 {
158 struct map_desc dram_io_desc[1];
159
160 dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
161 dram_io_desc[0].pfn = __phys_to_pfn(dram_sync_paddr);
162 dram_io_desc[0].length = dram_sync_size;
163 dram_io_desc[0].type = MT_MEMORY_RW_SO;
164 iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc));
165 dram_sync = (void __iomem *) dram_io_desc[0].virtual;
166
167 pr_info("OMAP4: Map %pa to %p for dram barrier\n",
168 &dram_sync_paddr, dram_sync);
169
170 soc_mb = omap4_mb;
171 }
172
173 #endif
174
gic_dist_disable(void)175 void gic_dist_disable(void)
176 {
177 if (gic_dist_base_addr)
178 writel_relaxed(0x0, gic_dist_base_addr + GIC_DIST_CTRL);
179 }
180
gic_dist_enable(void)181 void gic_dist_enable(void)
182 {
183 if (gic_dist_base_addr)
184 writel_relaxed(0x1, gic_dist_base_addr + GIC_DIST_CTRL);
185 }
186
gic_dist_disabled(void)187 bool gic_dist_disabled(void)
188 {
189 return !(readl_relaxed(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1);
190 }
191
gic_timer_retrigger(void)192 void gic_timer_retrigger(void)
193 {
194 u32 twd_int = readl_relaxed(twd_base + TWD_TIMER_INTSTAT);
195 u32 gic_int = readl_relaxed(gic_dist_base_addr + GIC_DIST_PENDING_SET);
196 u32 twd_ctrl = readl_relaxed(twd_base + TWD_TIMER_CONTROL);
197
198 if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) {
199 /*
200 * The local timer interrupt got lost while the distributor was
201 * disabled. Ack the pending interrupt, and retrigger it.
202 */
203 pr_warn("%s: lost localtimer interrupt\n", __func__);
204 writel_relaxed(1, twd_base + TWD_TIMER_INTSTAT);
205 if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) {
206 writel_relaxed(1, twd_base + TWD_TIMER_COUNTER);
207 twd_ctrl |= TWD_TIMER_CONTROL_ENABLE;
208 writel_relaxed(twd_ctrl, twd_base + TWD_TIMER_CONTROL);
209 }
210 }
211 }
212
213 #ifdef CONFIG_CACHE_L2X0
214
omap4_get_l2cache_base(void)215 void __iomem *omap4_get_l2cache_base(void)
216 {
217 return l2cache_base;
218 }
219
omap4_l2c310_write_sec(unsigned long val,unsigned reg)220 void omap4_l2c310_write_sec(unsigned long val, unsigned reg)
221 {
222 unsigned smc_op;
223
224 switch (reg) {
225 case L2X0_CTRL:
226 smc_op = OMAP4_MON_L2X0_CTRL_INDEX;
227 break;
228
229 case L2X0_AUX_CTRL:
230 smc_op = OMAP4_MON_L2X0_AUXCTRL_INDEX;
231 break;
232
233 case L2X0_DEBUG_CTRL:
234 smc_op = OMAP4_MON_L2X0_DBG_CTRL_INDEX;
235 break;
236
237 case L310_PREFETCH_CTRL:
238 smc_op = OMAP4_MON_L2X0_PREFETCH_INDEX;
239 break;
240
241 case L310_POWER_CTRL:
242 pr_info_once("OMAP L2C310: ROM does not support power control setting\n");
243 return;
244
245 default:
246 WARN_ONCE(1, "OMAP L2C310: ignoring write to reg 0x%x\n", reg);
247 return;
248 }
249
250 omap_smc1(smc_op, val);
251 }
252
omap_l2_cache_init(void)253 int __init omap_l2_cache_init(void)
254 {
255 /* Static mapping, never released */
256 l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
257 if (WARN_ON(!l2cache_base))
258 return -ENOMEM;
259 return 0;
260 }
261 #endif
262
omap4_get_sar_ram_base(void)263 void __iomem *omap4_get_sar_ram_base(void)
264 {
265 return sar_ram_base;
266 }
267
268 /*
269 * SAR RAM used to save and restore the HW context in low power modes.
270 * Note that we need to initialize this very early for kexec. See
271 * omap4_mpuss_early_init().
272 */
omap4_sar_ram_init(void)273 void __init omap4_sar_ram_init(void)
274 {
275 unsigned long sar_base;
276
277 /*
278 * To avoid code running on other OMAPs in
279 * multi-omap builds
280 */
281 if (cpu_is_omap44xx())
282 sar_base = OMAP44XX_SAR_RAM_BASE;
283 else if (soc_is_omap54xx())
284 sar_base = OMAP54XX_SAR_RAM_BASE;
285 else
286 return;
287
288 /* Static mapping, never released */
289 sar_ram_base = ioremap(sar_base, SZ_16K);
290 if (WARN_ON(!sar_ram_base))
291 return;
292 }
293
294 static const struct of_device_id intc_match[] = {
295 { .compatible = "ti,omap4-wugen-mpu", },
296 { .compatible = "ti,omap5-wugen-mpu", },
297 { },
298 };
299
300 static struct device_node *intc_node;
301
omap_gic_of_init(void)302 void __init omap_gic_of_init(void)
303 {
304 struct device_node *np;
305
306 intc_node = of_find_matching_node(NULL, intc_match);
307 if (WARN_ON(!intc_node)) {
308 pr_err("No WUGEN found in DT, system will misbehave.\n");
309 pr_err("UPDATE YOUR DEVICE TREE!\n");
310 }
311
312 /* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */
313 if (!cpu_is_omap446x())
314 goto skip_errata_init;
315
316 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
317 gic_dist_base_addr = of_iomap(np, 0);
318 WARN_ON(!gic_dist_base_addr);
319
320 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer");
321 twd_base = of_iomap(np, 0);
322 WARN_ON(!twd_base);
323
324 skip_errata_init:
325 irqchip_init();
326 }
327
