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 #include <linux/soc/ti/omap1-io.h>
30
31 #include <clocksource/timer-ti-dm.h>
32
33 #include "soc.h"
34
35 #define OMAP1610_GPTIMER1_BASE 0xfffb1400
36 #define OMAP1610_GPTIMER2_BASE 0xfffb1c00
37 #define OMAP1610_GPTIMER3_BASE 0xfffb2400
38 #define OMAP1610_GPTIMER4_BASE 0xfffb2c00
39 #define OMAP1610_GPTIMER5_BASE 0xfffb3400
40 #define OMAP1610_GPTIMER6_BASE 0xfffb3c00
41 #define OMAP1610_GPTIMER7_BASE 0xfffb7400
42 #define OMAP1610_GPTIMER8_BASE 0xfffbd400
43
44 #define OMAP1_DM_TIMER_COUNT 8
45
omap1_dm_timer_set_src(struct platform_device * pdev,int source)46 static int omap1_dm_timer_set_src(struct platform_device *pdev,
47 int source)
48 {
49 int n = (pdev->id - 1) << 1;
50 u32 l;
51
52 l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
53 l |= source << n;
54 omap_writel(l, MOD_CONF_CTRL_1);
55
56 return 0;
57 }
58
omap1_dm_timer_init(void)59 static int __init omap1_dm_timer_init(void)
60 {
61 int i;
62 int ret;
63 struct dmtimer_platform_data *pdata;
64 struct platform_device *pdev;
65
66 if (!cpu_is_omap16xx())
67 return 0;
68
69 for (i = 1; i <= OMAP1_DM_TIMER_COUNT; i++) {
70 struct resource res[2];
71 u32 base, irq;
72
73 switch (i) {
74 case 1:
75 base = OMAP1610_GPTIMER1_BASE;
76 irq = INT_1610_GPTIMER1;
77 break;
78 case 2:
79 base = OMAP1610_GPTIMER2_BASE;
80 irq = INT_1610_GPTIMER2;
81 break;
82 case 3:
83 base = OMAP1610_GPTIMER3_BASE;
84 irq = INT_1610_GPTIMER3;
85 break;
86 case 4:
87 base = OMAP1610_GPTIMER4_BASE;
88 irq = INT_1610_GPTIMER4;
89 break;
90 case 5:
91 base = OMAP1610_GPTIMER5_BASE;
92 irq = INT_1610_GPTIMER5;
93 break;
94 case 6:
95 base = OMAP1610_GPTIMER6_BASE;
96 irq = INT_1610_GPTIMER6;
97 break;
98 case 7:
99 base = OMAP1610_GPTIMER7_BASE;
100 irq = INT_1610_GPTIMER7;
101 break;
102 case 8:
103 base = OMAP1610_GPTIMER8_BASE;
104 irq = INT_1610_GPTIMER8;
105 break;
106 default:
107 /*
108 * not supposed to reach here.
109 * this is to remove warning.
110 */
111 return -EINVAL;
112 }
113
114 pdev = platform_device_alloc("omap_timer", i);
115 if (!pdev) {
116 pr_err("%s: Failed to device alloc for dmtimer%d\n",
117 __func__, i);
118 return -ENOMEM;
119 }
120
121 memset(res, 0, 2 * sizeof(struct resource));
122 res[0].start = base;
123 res[0].end = base + 0x46;
124 res[0].flags = IORESOURCE_MEM;
125 res[1].start = irq;
126 res[1].end = irq;
127 res[1].flags = IORESOURCE_IRQ;
128 ret = platform_device_add_resources(pdev, res,
129 ARRAY_SIZE(res));
130 if (ret) {
131 dev_err(&pdev->dev, "%s: Failed to add resources.\n",
132 __func__);
133 goto err_free_pdev;
134 }
135
136 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
137 if (!pdata) {
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 | OMAP_TIMER_HAS_DSP_IRQ;
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