arch/arm/mach-omap1/dmtimer.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) 2010 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 #define OMAP_TIMER_OCP_CFG_REG          0x10
  45 #define OMAP_TIMER_SYS_STAT_REG         0x14
  46 #define OMAP_TIMER_IF_CTRL_REG          0x40
  47
  48 static int omap1_dm_timer_set_src(struct platform_device *pdev,
  49                                 int source)
  50 {
  51         int n = (pdev->id - 1) << 1;
  52         u32 l;
  53
  54         l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
  55         l |= source << n;
  56         omap_writel(l, MOD_CONF_CTRL_1);
  57
  58         return 0;
  59 }
  60
  61
  62 int __init omap1_dm_timer_init(void)
  63 {
  64         int i;
  65         int ret;
  66         struct dmtimer_platform_data *pdata;
  67         struct platform_device *pdev;
  68
  69         if (!cpu_is_omap16xx())
  70                 return 0;
  71
  72         for (i = 1; i <= OMAP1_DM_TIMER_COUNT; i++) {
  73                 struct resource res[2];
  74                 u32 base, irq;
  75
  76                 switch (i) {
  77                 case 1:
  78                         base = OMAP1610_GPTIMER1_BASE;
  79                         irq = INT_1610_GPTIMER1;
  80                         break;
  81                 case 2:
  82                         base = OMAP1610_GPTIMER2_BASE;
  83                         irq = INT_1610_GPTIMER2;
  84                         break;
  85                 case 3:
  86                         base = OMAP1610_GPTIMER3_BASE;
  87                         irq = INT_1610_GPTIMER3;
  88                         break;
  89                 case 4:
  90                         base = OMAP1610_GPTIMER4_BASE;
  91                         irq = INT_1610_GPTIMER4;
  92                         break;
  93                 case 5:
  94                         base = OMAP1610_GPTIMER5_BASE;
  95                         irq = INT_1610_GPTIMER5;
  96                         break;
  97                 case 6:
  98                         base = OMAP1610_GPTIMER6_BASE;
  99                         irq = INT_1610_GPTIMER6;
 100                         break;
 101                 case 7:
 102                         base = OMAP1610_GPTIMER7_BASE;
 103                         irq = INT_1610_GPTIMER7;
 104                         break;
 105                 case 8:
 106                         base = OMAP1610_GPTIMER8_BASE;
 107                         irq = INT_1610_GPTIMER8;
 108                         break;
 109                 default:
 110                         /*
 111                          * not supposed to reach here.
 112                          * this is to remove warning.
 113                          */
 114                         return -EINVAL;
 115                 }
 116
 117                 pdev = platform_device_alloc("omap_timer", i);
 118                 if (!pdev) {
 119                         pr_err("%s: Failed to device alloc for dmtimer%d\n",
 120                                 __func__, i);
 121                         return -ENOMEM;
 122                 }
 123
 124                 memset(res, 0, 2 * sizeof(struct resource));
 125                 res[0].start = base;
 126                 res[0].end = base + 0x46;
 127                 res[0].flags = IORESOURCE_MEM;
 128                 res[1].start = irq;
 129                 res[1].end = irq;
 130                 res[1].flags = IORESOURCE_IRQ;
 131                 ret = platform_device_add_resources(pdev, res,
 132                                 ARRAY_SIZE(res));
 133                 if (ret) {
 134                         dev_err(&pdev->dev, "%s: Failed to add resources.\n",
 135                                 __func__);
 136                         goto err_free_pdev;
 137                 }
 138
 139                 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 140                 if (!pdata) {
 141                         dev_err(&pdev->dev, "%s: Failed to allocate pdata.\n",
 142                                 __func__);
 143                         ret = -ENOMEM;
 144                         goto err_free_pdata;
 145                 }
 146
 147                 pdata->set_timer_src = omap1_dm_timer_set_src;
 148                 pdata->is_early_init = 0;
 149                 pdata->timer_ip_type = OMAP_TIMER_IP_VERSION_1;
 150                 pdata->needs_manual_reset = 1;
 151
 152                 ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
 153                 if (ret) {
 154                         dev_err(&pdev->dev, "%s: Failed to add platform data.\n",
 155                                 __func__);
 156                         goto err_free_pdata;
 157                 }
 158
 159                 ret = platform_device_add(pdev);
 160                 if (ret) {
 161                         dev_err(&pdev->dev, "%s: Failed to add platform device.\n",
 162                                 __func__);
 163                         goto err_free_pdata;
 164                 }
 165
 166                 dev_dbg(&pdev->dev, " Registered.\n");
 167         }
 168
 169         return 0;
 170
 171 err_free_pdata:
 172         kfree(pdata);
 173
 174 err_free_pdev:
 175         platform_device_unregister(pdev);
 176
 177         return ret;
 178 }
 179 arch_initcall(omap1_dm_timer_init);