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 - https://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 
omap1_dm_timer_set_src(struct platform_device * pdev,int source)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 
omap1_dm_timer_init(void)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_unregister(pdev);
169 
170 	return ret;
171 }
172 arch_initcall(omap1_dm_timer_init);
173