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[karo-tx-linux.git] / arch / arm / mach-cns3xxx / core.c
1 /*
2  * Copyright 1999 - 2003 ARM Limited
3  * Copyright 2000 Deep Blue Solutions Ltd
4  * Copyright 2008 Cavium Networks
5  *
6  * This file is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License, Version 2, as
8  * published by the Free Software Foundation.
9  */
10
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/clockchips.h>
14 #include <linux/io.h>
15 #include <linux/irqchip/arm-gic.h>
16 #include <asm/mach/map.h>
17 #include <asm/mach/time.h>
18 #include <asm/mach/irq.h>
19 #include <asm/hardware/cache-l2x0.h>
20 #include <mach/cns3xxx.h>
21 #include "core.h"
22
23 static struct map_desc cns3xxx_io_desc[] __initdata = {
24         {
25                 .virtual        = CNS3XXX_TC11MP_SCU_BASE_VIRT,
26                 .pfn            = __phys_to_pfn(CNS3XXX_TC11MP_SCU_BASE),
27                 .length         = SZ_8K,
28                 .type           = MT_DEVICE,
29         }, {
30                 .virtual        = CNS3XXX_TIMER1_2_3_BASE_VIRT,
31                 .pfn            = __phys_to_pfn(CNS3XXX_TIMER1_2_3_BASE),
32                 .length         = SZ_4K,
33                 .type           = MT_DEVICE,
34         }, {
35                 .virtual        = CNS3XXX_GPIOA_BASE_VIRT,
36                 .pfn            = __phys_to_pfn(CNS3XXX_GPIOA_BASE),
37                 .length         = SZ_4K,
38                 .type           = MT_DEVICE,
39         }, {
40                 .virtual        = CNS3XXX_GPIOB_BASE_VIRT,
41                 .pfn            = __phys_to_pfn(CNS3XXX_GPIOB_BASE),
42                 .length         = SZ_4K,
43                 .type           = MT_DEVICE,
44         }, {
45                 .virtual        = CNS3XXX_MISC_BASE_VIRT,
46                 .pfn            = __phys_to_pfn(CNS3XXX_MISC_BASE),
47                 .length         = SZ_4K,
48                 .type           = MT_DEVICE,
49         }, {
50                 .virtual        = CNS3XXX_PM_BASE_VIRT,
51                 .pfn            = __phys_to_pfn(CNS3XXX_PM_BASE),
52                 .length         = SZ_4K,
53                 .type           = MT_DEVICE,
54         },
55 };
56
57 void __init cns3xxx_map_io(void)
58 {
59         iotable_init(cns3xxx_io_desc, ARRAY_SIZE(cns3xxx_io_desc));
60 }
61
62 /* used by entry-macro.S */
63 void __init cns3xxx_init_irq(void)
64 {
65         gic_init(0, 29, IOMEM(CNS3XXX_TC11MP_GIC_DIST_BASE_VIRT),
66                  IOMEM(CNS3XXX_TC11MP_GIC_CPU_BASE_VIRT));
67 }
68
69 void cns3xxx_power_off(void)
70 {
71         u32 __iomem *pm_base = IOMEM(CNS3XXX_PM_BASE_VIRT);
72         u32 clkctrl;
73
74         printk(KERN_INFO "powering system down...\n");
75
76         clkctrl = readl(pm_base + PM_SYS_CLK_CTRL_OFFSET);
77         clkctrl &= 0xfffff1ff;
78         clkctrl |= (0x5 << 9);          /* Hibernate */
79         writel(clkctrl, pm_base + PM_SYS_CLK_CTRL_OFFSET);
80
81 }
82
83 /*
84  * Timer
85  */
86 static void __iomem *cns3xxx_tmr1;
87
88 static void cns3xxx_timer_set_mode(enum clock_event_mode mode,
89                                    struct clock_event_device *clk)
90 {
91         unsigned long ctrl = readl(cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
92         int pclk = cns3xxx_cpu_clock() / 8;
93         int reload;
94
95         switch (mode) {
96         case CLOCK_EVT_MODE_PERIODIC:
97                 reload = pclk * 20 / (3 * HZ) * 0x25000;
98                 writel(reload, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
99                 ctrl |= (1 << 0) | (1 << 2) | (1 << 9);
100                 break;
101         case CLOCK_EVT_MODE_ONESHOT:
102                 /* period set, and timer enabled in 'next_event' hook */
103                 ctrl |= (1 << 2) | (1 << 9);
104                 break;
105         case CLOCK_EVT_MODE_UNUSED:
106         case CLOCK_EVT_MODE_SHUTDOWN:
107         default:
108                 ctrl = 0;
109         }
110
111         writel(ctrl, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
112 }
113
114 static int cns3xxx_timer_set_next_event(unsigned long evt,
115                                         struct clock_event_device *unused)
116 {
117         unsigned long ctrl = readl(cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
118
119         writel(evt, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
120         writel(ctrl | (1 << 0), cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
121
122         return 0;
123 }
124
125 static struct clock_event_device cns3xxx_tmr1_clockevent = {
126         .name           = "cns3xxx timer1",
127         .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
128         .set_mode       = cns3xxx_timer_set_mode,
129         .set_next_event = cns3xxx_timer_set_next_event,
130         .rating         = 350,
131         .cpumask        = cpu_all_mask,
132 };
133
134 static void __init cns3xxx_clockevents_init(unsigned int timer_irq)
135 {
136         cns3xxx_tmr1_clockevent.irq = timer_irq;
137         clockevents_config_and_register(&cns3xxx_tmr1_clockevent,
138                                         (cns3xxx_cpu_clock() >> 3) * 1000000,
139                                         0xf, 0xffffffff);
140 }
141
142 /*
143  * IRQ handler for the timer
144  */
145 static irqreturn_t cns3xxx_timer_interrupt(int irq, void *dev_id)
146 {
147         struct clock_event_device *evt = &cns3xxx_tmr1_clockevent;
148         u32 __iomem *stat = cns3xxx_tmr1 + TIMER1_2_INTERRUPT_STATUS_OFFSET;
149         u32 val;
150
151         /* Clear the interrupt */
152         val = readl(stat);
153         writel(val & ~(1 << 2), stat);
154
155         evt->event_handler(evt);
156
157         return IRQ_HANDLED;
158 }
159
160 static struct irqaction cns3xxx_timer_irq = {
161         .name           = "timer",
162         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
163         .handler        = cns3xxx_timer_interrupt,
164 };
165
166 /*
167  * Set up the clock source and clock events devices
168  */
169 static void __init __cns3xxx_timer_init(unsigned int timer_irq)
170 {
171         u32 val;
172         u32 irq_mask;
173
174         /*
175          * Initialise to a known state (all timers off)
176          */
177
178         /* disable timer1 and timer2 */
179         writel(0, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
180         /* stop free running timer3 */
181         writel(0, cns3xxx_tmr1 + TIMER_FREERUN_CONTROL_OFFSET);
182
183         /* timer1 */
184         writel(0x5C800, cns3xxx_tmr1 + TIMER1_COUNTER_OFFSET);
185         writel(0x5C800, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
186
187         writel(0, cns3xxx_tmr1 + TIMER1_MATCH_V1_OFFSET);
188         writel(0, cns3xxx_tmr1 + TIMER1_MATCH_V2_OFFSET);
189
190         /* mask irq, non-mask timer1 overflow */
191         irq_mask = readl(cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
192         irq_mask &= ~(1 << 2);
193         irq_mask |= 0x03;
194         writel(irq_mask, cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
195
196         /* down counter */
197         val = readl(cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
198         val |= (1 << 9);
199         writel(val, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
200
201         /* timer2 */
202         writel(0, cns3xxx_tmr1 + TIMER2_MATCH_V1_OFFSET);
203         writel(0, cns3xxx_tmr1 + TIMER2_MATCH_V2_OFFSET);
204
205         /* mask irq */
206         irq_mask = readl(cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
207         irq_mask |= ((1 << 3) | (1 << 4) | (1 << 5));
208         writel(irq_mask, cns3xxx_tmr1 + TIMER1_2_INTERRUPT_MASK_OFFSET);
209
210         /* down counter */
211         val = readl(cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
212         val |= (1 << 10);
213         writel(val, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
214
215         /* Make irqs happen for the system timer */
216         setup_irq(timer_irq, &cns3xxx_timer_irq);
217
218         cns3xxx_clockevents_init(timer_irq);
219 }
220
221 void __init cns3xxx_timer_init(void)
222 {
223         cns3xxx_tmr1 = IOMEM(CNS3XXX_TIMER1_2_3_BASE_VIRT);
224
225         __cns3xxx_timer_init(IRQ_CNS3XXX_TIMER0);
226 }
227
228 #ifdef CONFIG_CACHE_L2X0
229
230 void __init cns3xxx_l2x0_init(void)
231 {
232         void __iomem *base = ioremap(CNS3XXX_L2C_BASE, SZ_4K);
233         u32 val;
234
235         if (WARN_ON(!base))
236                 return;
237
238         /*
239          * Tag RAM Control register
240          *
241          * bit[10:8]    - 1 cycle of write accesses latency
242          * bit[6:4]     - 1 cycle of read accesses latency
243          * bit[3:0]     - 1 cycle of setup latency
244          *
245          * 1 cycle of latency for setup, read and write accesses
246          */
247         val = readl(base + L2X0_TAG_LATENCY_CTRL);
248         val &= 0xfffff888;
249         writel(val, base + L2X0_TAG_LATENCY_CTRL);
250
251         /*
252          * Data RAM Control register
253          *
254          * bit[10:8]    - 1 cycles of write accesses latency
255          * bit[6:4]     - 1 cycles of read accesses latency
256          * bit[3:0]     - 1 cycle of setup latency
257          *
258          * 1 cycle of latency for setup, read and write accesses
259          */
260         val = readl(base + L2X0_DATA_LATENCY_CTRL);
261         val &= 0xfffff888;
262         writel(val, base + L2X0_DATA_LATENCY_CTRL);
263
264         /* 32 KiB, 8-way, parity disable */
265         l2x0_init(base, 0x00540000, 0xfe000fff);
266 }
267
268 #endif /* CONFIG_CACHE_L2X0 */