LXR linux/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 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
  45static 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
  58static 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
 164err_free_pdata:
 165        kfree(pdata);
 166
 167err_free_pdev:
 168        platform_device_unregister(pdev);
 169
 170        return ret;
 171}
 172arch_initcall(omap1_dm_timer_init);
 173