Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / arch / arm / mach-omap2 / omap4-common.c
blobb39efd46abf991827169a6c17a6aa91f3dfeb39f
1 /*
2 * OMAP4 specific common source file.
4 * Copyright (C) 2010 Texas Instruments, Inc.
5 * Author:
6 * Santosh Shilimkar <santosh.shilimkar@ti.com>
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.
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>
28 #include <asm/hardware/cache-l2x0.h>
29 #include <asm/mach/map.h>
30 #include <asm/memblock.h>
31 #include <asm/smp_twd.h>
33 #include "omap-wakeupgen.h"
34 #include "soc.h"
35 #include "iomap.h"
36 #include "common.h"
37 #include "mmc.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"
44 #ifdef CONFIG_CACHE_L2X0
45 static void __iomem *l2cache_base;
46 #endif
48 static void __iomem *sar_ram_base;
49 static void __iomem *gic_dist_base_addr;
50 static void __iomem *twd_base;
52 #define IRQ_LOCALTIMER 29
54 #ifdef CONFIG_OMAP4_ERRATA_I688
55 /* Used to implement memory barrier on DRAM path */
56 #define OMAP4_DRAM_BARRIER_VA 0xfe600000
58 void __iomem *dram_sync, *sram_sync;
60 static phys_addr_t paddr;
61 static u32 size;
63 void omap_bus_sync(void)
65 if (dram_sync && sram_sync) {
66 writel_relaxed(readl_relaxed(dram_sync), dram_sync);
67 writel_relaxed(readl_relaxed(sram_sync), sram_sync);
68 isb();
71 EXPORT_SYMBOL(omap_bus_sync);
73 /* Steal one page physical memory for barrier implementation */
74 int __init omap_barrier_reserve_memblock(void)
77 size = ALIGN(PAGE_SIZE, SZ_1M);
78 paddr = arm_memblock_steal(size, SZ_1M);
80 return 0;
83 void __init omap_barriers_init(void)
85 struct map_desc dram_io_desc[1];
87 dram_io_desc[0].virtual = OMAP4_DRAM_BARRIER_VA;
88 dram_io_desc[0].pfn = __phys_to_pfn(paddr);
89 dram_io_desc[0].length = size;
90 dram_io_desc[0].type = MT_MEMORY_SO;
91 iotable_init(dram_io_desc, ARRAY_SIZE(dram_io_desc));
92 dram_sync = (void __iomem *) dram_io_desc[0].virtual;
93 sram_sync = (void __iomem *) OMAP4_SRAM_VA;
95 pr_info("OMAP4: Map 0x%08llx to 0x%08lx for dram barrier\n",
96 (long long) paddr, dram_io_desc[0].virtual);
99 #else
100 void __init omap_barriers_init(void)
102 #endif
104 void __init gic_init_irq(void)
106 void __iomem *omap_irq_base;
108 /* Static mapping, never released */
109 gic_dist_base_addr = ioremap(OMAP44XX_GIC_DIST_BASE, SZ_4K);
110 BUG_ON(!gic_dist_base_addr);
112 twd_base = ioremap(OMAP44XX_LOCAL_TWD_BASE, SZ_4K);
113 BUG_ON(!twd_base);
115 /* Static mapping, never released */
116 omap_irq_base = ioremap(OMAP44XX_GIC_CPU_BASE, SZ_512);
117 BUG_ON(!omap_irq_base);
119 omap_wakeupgen_init();
121 gic_init(0, 29, gic_dist_base_addr, omap_irq_base);
124 void gic_dist_disable(void)
126 if (gic_dist_base_addr)
127 __raw_writel(0x0, gic_dist_base_addr + GIC_DIST_CTRL);
130 bool gic_dist_disabled(void)
132 return !(__raw_readl(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1);
135 void gic_timer_retrigger(void)
137 u32 twd_int = __raw_readl(twd_base + TWD_TIMER_INTSTAT);
138 u32 gic_int = __raw_readl(gic_dist_base_addr + GIC_DIST_PENDING_SET);
139 u32 twd_ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL);
141 if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) {
143 * The local timer interrupt got lost while the distributor was
144 * disabled. Ack the pending interrupt, and retrigger it.
146 pr_warn("%s: lost localtimer interrupt\n", __func__);
147 __raw_writel(1, twd_base + TWD_TIMER_INTSTAT);
148 if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) {
149 __raw_writel(1, twd_base + TWD_TIMER_COUNTER);
150 twd_ctrl |= TWD_TIMER_CONTROL_ENABLE;
151 __raw_writel(twd_ctrl, twd_base + TWD_TIMER_CONTROL);
156 #ifdef CONFIG_CACHE_L2X0
158 void __iomem *omap4_get_l2cache_base(void)
160 return l2cache_base;
163 static void omap4_l2x0_disable(void)
165 /* Disable PL310 L2 Cache controller */
166 omap_smc1(0x102, 0x0);
169 static void omap4_l2x0_set_debug(unsigned long val)
171 /* Program PL310 L2 Cache controller debug register */
172 omap_smc1(0x100, val);
175 static int __init omap_l2_cache_init(void)
177 u32 aux_ctrl = 0;
180 * To avoid code running on other OMAPs in
181 * multi-omap builds
183 if (!cpu_is_omap44xx())
184 return -ENODEV;
186 /* Static mapping, never released */
187 l2cache_base = ioremap(OMAP44XX_L2CACHE_BASE, SZ_4K);
188 if (WARN_ON(!l2cache_base))
189 return -ENOMEM;
192 * 16-way associativity, parity disabled
193 * Way size - 32KB (es1.0)
194 * Way size - 64KB (es2.0 +)
196 aux_ctrl = ((1 << L2X0_AUX_CTRL_ASSOCIATIVITY_SHIFT) |
197 (0x1 << 25) |
198 (0x1 << L2X0_AUX_CTRL_NS_LOCKDOWN_SHIFT) |
199 (0x1 << L2X0_AUX_CTRL_NS_INT_CTRL_SHIFT));
201 if (omap_rev() == OMAP4430_REV_ES1_0) {
202 aux_ctrl |= 0x2 << L2X0_AUX_CTRL_WAY_SIZE_SHIFT;
203 } else {
204 aux_ctrl |= ((0x3 << L2X0_AUX_CTRL_WAY_SIZE_SHIFT) |
205 (1 << L2X0_AUX_CTRL_SHARE_OVERRIDE_SHIFT) |
206 (1 << L2X0_AUX_CTRL_DATA_PREFETCH_SHIFT) |
207 (1 << L2X0_AUX_CTRL_INSTR_PREFETCH_SHIFT) |
208 (1 << L2X0_AUX_CTRL_EARLY_BRESP_SHIFT));
210 if (omap_rev() != OMAP4430_REV_ES1_0)
211 omap_smc1(0x109, aux_ctrl);
213 /* Enable PL310 L2 Cache controller */
214 omap_smc1(0x102, 0x1);
216 if (of_have_populated_dt())
217 l2x0_of_init(aux_ctrl, L2X0_AUX_CTRL_MASK);
218 else
219 l2x0_init(l2cache_base, aux_ctrl, L2X0_AUX_CTRL_MASK);
222 * Override default outer_cache.disable with a OMAP4
223 * specific one
225 outer_cache.disable = omap4_l2x0_disable;
226 outer_cache.set_debug = omap4_l2x0_set_debug;
228 return 0;
230 omap_early_initcall(omap_l2_cache_init);
231 #endif
233 void __iomem *omap4_get_sar_ram_base(void)
235 return sar_ram_base;
239 * SAR RAM used to save and restore the HW
240 * context in low power modes
242 static int __init omap4_sar_ram_init(void)
244 unsigned long sar_base;
247 * To avoid code running on other OMAPs in
248 * multi-omap builds
250 if (cpu_is_omap44xx())
251 sar_base = OMAP44XX_SAR_RAM_BASE;
252 else if (soc_is_omap54xx())
253 sar_base = OMAP54XX_SAR_RAM_BASE;
254 else
255 return -ENOMEM;
257 /* Static mapping, never released */
258 sar_ram_base = ioremap(sar_base, SZ_16K);
259 if (WARN_ON(!sar_ram_base))
260 return -ENOMEM;
262 return 0;
264 omap_early_initcall(omap4_sar_ram_init);
266 void __init omap_gic_of_init(void)
268 struct device_node *np;
270 /* Extract GIC distributor and TWD bases for OMAP4460 ROM Errata WA */
271 if (!cpu_is_omap446x())
272 goto skip_errata_init;
274 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic");
275 gic_dist_base_addr = of_iomap(np, 0);
276 WARN_ON(!gic_dist_base_addr);
278 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-twd-timer");
279 twd_base = of_iomap(np, 0);
280 WARN_ON(!twd_base);
282 skip_errata_init:
283 omap_wakeupgen_init();
284 irqchip_init();