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 #include <linux/platform_data/dmtimer-omap.h>
  29
  30 #include <mach/irqs.h>
  31
  32 #include <plat/dmtimer.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                         dev_err(&pdev->dev, "%s: Failed to allocate pdata.\n",
 138                                 __func__);
 139                         ret = -ENOMEM;
 140                         goto err_free_pdata;
 141                 }
 142
 143                 pdata->set_timer_src = omap1_dm_timer_set_src;
 144                 pdata->timer_capability = OMAP_TIMER_ALWON |
 145                                 OMAP_TIMER_NEEDS_RESET | OMAP_TIMER_HAS_DSP_IRQ;
 146
 147                 ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
 148                 if (ret) {
 149                         dev_err(&pdev->dev, "%s: Failed to add platform data.\n",
 150                                 __func__);
 151                         goto err_free_pdata;
 152                 }
 153
 154                 ret = platform_device_add(pdev);
 155                 if (ret) {
 156                         dev_err(&pdev->dev, "%s: Failed to add platform device.\n",
 157                                 __func__);
 158                         goto err_free_pdata;
 159                 }
 160
 161                 dev_dbg(&pdev->dev, " Registered.\n");
 162         }
 163
 164         return 0;
 165
 166 err_free_pdata:
 167         kfree(pdata);
 168
 169 err_free_pdev:
 170         platform_device_unregister(pdev);
 171
 172         return ret;
 173 }
 174 arch_initcall(omap1_dm_timer_init);