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 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);