GNU Linux-libre 4.19.314-gnu1
[releases.git] / arch / arm / mach-omap1 / timer.c
1 /**
2  * OMAP1 Dual-Mode Timers - platform device registration
3  *
4  * Contains first level initialization routines which internally
5  * generates timer device information and registers with linux
6  * device model. It also has a low level function to change the timer
7  * input clock source.
8  *
9  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
10  * Tarun Kanti DebBarma <tarun.kanti@ti.com>
11  * Thara Gopinath <thara@ti.com>
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License version 2 as
15  * published by the Free Software Foundation.
16  *
17  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
18  * kind, whether express or implied; without even the implied warranty
19  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  */
22
23 #include <linux/clk.h>
24 #include <linux/io.h>
25 #include <linux/err.h>
26 #include <linux/slab.h>
27 #include <linux/platform_device.h>
28 #include <linux/platform_data/dmtimer-omap.h>
29
30 #include <clocksource/timer-ti-dm.h>
31
32 #include "soc.h"
33
34 #define OMAP1610_GPTIMER1_BASE          0xfffb1400
35 #define OMAP1610_GPTIMER2_BASE          0xfffb1c00
36 #define OMAP1610_GPTIMER3_BASE          0xfffb2400
37 #define OMAP1610_GPTIMER4_BASE          0xfffb2c00
38 #define OMAP1610_GPTIMER5_BASE          0xfffb3400
39 #define OMAP1610_GPTIMER6_BASE          0xfffb3c00
40 #define OMAP1610_GPTIMER7_BASE          0xfffb7400
41 #define OMAP1610_GPTIMER8_BASE          0xfffbd400
42
43 #define OMAP1_DM_TIMER_COUNT            8
44
45 static int omap1_dm_timer_set_src(struct platform_device *pdev,
46                                 int source)
47 {
48         int n = (pdev->id - 1) << 1;
49         u32 l;
50
51         l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
52         l |= source << n;
53         omap_writel(l, MOD_CONF_CTRL_1);
54
55         return 0;
56 }
57
58 static int __init omap1_dm_timer_init(void)
59 {
60         int i;
61         int ret;
62         struct dmtimer_platform_data *pdata;
63         struct platform_device *pdev;
64
65         if (!cpu_is_omap16xx())
66                 return 0;
67
68         for (i = 1; i <= OMAP1_DM_TIMER_COUNT; i++) {
69                 struct resource res[2];
70                 u32 base, irq;
71
72                 switch (i) {
73                 case 1:
74                         base = OMAP1610_GPTIMER1_BASE;
75                         irq = INT_1610_GPTIMER1;
76                         break;
77                 case 2:
78                         base = OMAP1610_GPTIMER2_BASE;
79                         irq = INT_1610_GPTIMER2;
80                         break;
81                 case 3:
82                         base = OMAP1610_GPTIMER3_BASE;
83                         irq = INT_1610_GPTIMER3;
84                         break;
85                 case 4:
86                         base = OMAP1610_GPTIMER4_BASE;
87                         irq = INT_1610_GPTIMER4;
88                         break;
89                 case 5:
90                         base = OMAP1610_GPTIMER5_BASE;
91                         irq = INT_1610_GPTIMER5;
92                         break;
93                 case 6:
94                         base = OMAP1610_GPTIMER6_BASE;
95                         irq = INT_1610_GPTIMER6;
96                         break;
97                 case 7:
98                         base = OMAP1610_GPTIMER7_BASE;
99                         irq = INT_1610_GPTIMER7;
100                         break;
101                 case 8:
102                         base = OMAP1610_GPTIMER8_BASE;
103                         irq = INT_1610_GPTIMER8;
104                         break;
105                 default:
106                         /*
107                          * not supposed to reach here.
108                          * this is to remove warning.
109                          */
110                         return -EINVAL;
111                 }
112
113                 pdev = platform_device_alloc("omap_timer", i);
114                 if (!pdev) {
115                         pr_err("%s: Failed to device alloc for dmtimer%d\n",
116                                 __func__, i);
117                         return -ENOMEM;
118                 }
119
120                 memset(res, 0, 2 * sizeof(struct resource));
121                 res[0].start = base;
122                 res[0].end = base + 0x46;
123                 res[0].flags = IORESOURCE_MEM;
124                 res[1].start = irq;
125                 res[1].end = irq;
126                 res[1].flags = IORESOURCE_IRQ;
127                 ret = platform_device_add_resources(pdev, res,
128                                 ARRAY_SIZE(res));
129                 if (ret) {
130                         dev_err(&pdev->dev, "%s: Failed to add resources.\n",
131                                 __func__);
132                         goto err_free_pdev;
133                 }
134
135                 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
136                 if (!pdata) {
137                         ret = -ENOMEM;
138                         goto err_free_pdata;
139                 }
140
141                 pdata->set_timer_src = omap1_dm_timer_set_src;
142                 pdata->timer_capability = OMAP_TIMER_ALWON |
143                                 OMAP_TIMER_NEEDS_RESET | OMAP_TIMER_HAS_DSP_IRQ;
144
145                 ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
146                 if (ret) {
147                         dev_err(&pdev->dev, "%s: Failed to add platform data.\n",
148                                 __func__);
149                         goto err_free_pdata;
150                 }
151
152                 ret = platform_device_add(pdev);
153                 if (ret) {
154                         dev_err(&pdev->dev, "%s: Failed to add platform device.\n",
155                                 __func__);
156                         goto err_free_pdata;
157                 }
158
159                 dev_dbg(&pdev->dev, " Registered.\n");
160         }
161
162         return 0;
163
164 err_free_pdata:
165         kfree(pdata);
166
167 err_free_pdev:
168         platform_device_put(pdev);
169
170         return ret;
171 }
172 arch_initcall(omap1_dm_timer_init);