xref: /linux/arch/arm/mach-omap1/timer.c (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
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 low level function to chnage 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 
29 #include <mach/irqs.h>
30 
31 #include <plat/dmtimer.h>
32 
33 #define OMAP1610_GPTIMER1_BASE		0xfffb1400
34 #define OMAP1610_GPTIMER2_BASE		0xfffb1c00
35 #define OMAP1610_GPTIMER3_BASE		0xfffb2400
36 #define OMAP1610_GPTIMER4_BASE		0xfffb2c00
37 #define OMAP1610_GPTIMER5_BASE		0xfffb3400
38 #define OMAP1610_GPTIMER6_BASE		0xfffb3c00
39 #define OMAP1610_GPTIMER7_BASE		0xfffb7400
40 #define OMAP1610_GPTIMER8_BASE		0xfffbd400
41 
42 #define OMAP1_DM_TIMER_COUNT		8
43 
44 static int omap1_dm_timer_set_src(struct platform_device *pdev,
45 				int source)
46 {
47 	int n = (pdev->id - 1) << 1;
48 	u32 l;
49 
50 	l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
51 	l |= source << n;
52 	omap_writel(l, MOD_CONF_CTRL_1);
53 
54 	return 0;
55 }
56 
57 static int __init omap1_dm_timer_init(void)
58 {
59 	int i;
60 	int ret;
61 	struct dmtimer_platform_data *pdata;
62 	struct platform_device *pdev;
63 
64 	if (!cpu_is_omap16xx())
65 		return 0;
66 
67 	for (i = 1; i <= OMAP1_DM_TIMER_COUNT; i++) {
68 		struct resource res[2];
69 		u32 base, irq;
70 
71 		switch (i) {
72 		case 1:
73 			base = OMAP1610_GPTIMER1_BASE;
74 			irq = INT_1610_GPTIMER1;
75 			break;
76 		case 2:
77 			base = OMAP1610_GPTIMER2_BASE;
78 			irq = INT_1610_GPTIMER2;
79 			break;
80 		case 3:
81 			base = OMAP1610_GPTIMER3_BASE;
82 			irq = INT_1610_GPTIMER3;
83 			break;
84 		case 4:
85 			base = OMAP1610_GPTIMER4_BASE;
86 			irq = INT_1610_GPTIMER4;
87 			break;
88 		case 5:
89 			base = OMAP1610_GPTIMER5_BASE;
90 			irq = INT_1610_GPTIMER5;
91 			break;
92 		case 6:
93 			base = OMAP1610_GPTIMER6_BASE;
94 			irq = INT_1610_GPTIMER6;
95 			break;
96 		case 7:
97 			base = OMAP1610_GPTIMER7_BASE;
98 			irq = INT_1610_GPTIMER7;
99 			break;
100 		case 8:
101 			base = OMAP1610_GPTIMER8_BASE;
102 			irq = INT_1610_GPTIMER8;
103 			break;
104 		default:
105 			/*
106 			 * not supposed to reach here.
107 			 * this is to remove warning.
108 			 */
109 			return -EINVAL;
110 		}
111 
112 		pdev = platform_device_alloc("omap_timer", i);
113 		if (!pdev) {
114 			pr_err("%s: Failed to device alloc for dmtimer%d\n",
115 				__func__, i);
116 			return -ENOMEM;
117 		}
118 
119 		memset(res, 0, 2 * sizeof(struct resource));
120 		res[0].start = base;
121 		res[0].end = base + 0x46;
122 		res[0].flags = IORESOURCE_MEM;
123 		res[1].start = irq;
124 		res[1].end = irq;
125 		res[1].flags = IORESOURCE_IRQ;
126 		ret = platform_device_add_resources(pdev, res,
127 				ARRAY_SIZE(res));
128 		if (ret) {
129 			dev_err(&pdev->dev, "%s: Failed to add resources.\n",
130 				__func__);
131 			goto err_free_pdev;
132 		}
133 
134 		pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
135 		if (!pdata) {
136 			dev_err(&pdev->dev, "%s: Failed to allocate pdata.\n",
137 				__func__);
138 			ret = -ENOMEM;
139 			goto err_free_pdata;
140 		}
141 
142 		pdata->set_timer_src = omap1_dm_timer_set_src;
143 		pdata->timer_capability = OMAP_TIMER_ALWON |
144 				OMAP_TIMER_NEEDS_RESET;
145 
146 		ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
147 		if (ret) {
148 			dev_err(&pdev->dev, "%s: Failed to add platform data.\n",
149 				__func__);
150 			goto err_free_pdata;
151 		}
152 
153 		ret = platform_device_add(pdev);
154 		if (ret) {
155 			dev_err(&pdev->dev, "%s: Failed to add platform device.\n",
156 				__func__);
157 			goto err_free_pdata;
158 		}
159 
160 		dev_dbg(&pdev->dev, " Registered.\n");
161 	}
162 
163 	return 0;
164 
165 err_free_pdata:
166 	kfree(pdata);
167 
168 err_free_pdev:
169 	platform_device_unregister(pdev);
170 
171 	return ret;
172 }
173 arch_initcall(omap1_dm_timer_init);
174