arch/arm/mach-omap1/timer.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * OMAP1 Dual-Mode Timers - platform device registration
   4  *
   5  * Contains first level initialization routines which internally
   6  * generates timer device information and registers with linux
   7  * device model. It also has a low level function to change the timer
   8  * input clock source.
   9  *
  10  * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
  11  * Tarun Kanti DebBarma <tarun.kanti@ti.com>
  12  * Thara Gopinath <thara@ti.com>
  13  */
  14
  15 #include <linux/clk.h>
  16 #include <linux/io.h>
  17 #include <linux/err.h>
  18 #include <linux/slab.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/platform_data/dmtimer-omap.h>
  21 #include <linux/soc/ti/omap1-io.h>
  22
  23 #include <clocksource/timer-ti-dm.h>
  24
  25 #include "soc.h"
  26
  27 #define OMAP1610_GPTIMER1_BASE          0xfffb1400
  28 #define OMAP1610_GPTIMER2_BASE          0xfffb1c00
  29 #define OMAP1610_GPTIMER3_BASE          0xfffb2400
  30 #define OMAP1610_GPTIMER4_BASE          0xfffb2c00
  31 #define OMAP1610_GPTIMER5_BASE          0xfffb3400
  32 #define OMAP1610_GPTIMER6_BASE          0xfffb3c00
  33 #define OMAP1610_GPTIMER7_BASE          0xfffb7400
  34 #define OMAP1610_GPTIMER8_BASE          0xfffbd400
  35
  36 #define OMAP1_DM_TIMER_COUNT            8
  37
  38 static int omap1_dm_timer_set_src(struct platform_device *pdev,
  39                                 int source)
  40 {
  41         int n = (pdev->id - 1) << 1;
  42         u32 l;
  43
  44         l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
  45         l |= source << n;
  46         omap_writel(l, MOD_CONF_CTRL_1);
  47
  48         return 0;
  49 }
  50
  51 static int __init omap1_dm_timer_init(void)
  52 {
  53         int i;
  54         int ret;
  55         struct dmtimer_platform_data *pdata;
  56         struct platform_device *pdev;
  57
  58         if (!cpu_is_omap16xx())
  59                 return 0;
  60
  61         for (i = 1; i <= OMAP1_DM_TIMER_COUNT; i++) {
  62                 struct resource res[2];
  63                 u32 base, irq;
  64
  65                 switch (i) {
  66                 case 1:
  67                         base = OMAP1610_GPTIMER1_BASE;
  68                         irq = INT_1610_GPTIMER1;
  69                         break;
  70                 case 2:
  71                         base = OMAP1610_GPTIMER2_BASE;
  72                         irq = INT_1610_GPTIMER2;
  73                         break;
  74                 case 3:
  75                         base = OMAP1610_GPTIMER3_BASE;
  76                         irq = INT_1610_GPTIMER3;
  77                         break;
  78                 case 4:
  79                         base = OMAP1610_GPTIMER4_BASE;
  80                         irq = INT_1610_GPTIMER4;
  81                         break;
  82                 case 5:
  83                         base = OMAP1610_GPTIMER5_BASE;
  84                         irq = INT_1610_GPTIMER5;
  85                         break;
  86                 case 6:
  87                         base = OMAP1610_GPTIMER6_BASE;
  88                         irq = INT_1610_GPTIMER6;
  89                         break;
  90                 case 7:
  91                         base = OMAP1610_GPTIMER7_BASE;
  92                         irq = INT_1610_GPTIMER7;
  93                         break;
  94                 case 8:
  95                         base = OMAP1610_GPTIMER8_BASE;
  96                         irq = INT_1610_GPTIMER8;
  97                         break;
  98                 default:
  99                         /*
 100                          * not supposed to reach here.
 101                          * this is to remove warning.
 102                          */
 103                         return -EINVAL;
 104                 }
 105
 106                 pdev = platform_device_alloc("omap_timer", i);
 107                 if (!pdev) {
 108                         pr_err("%s: Failed to device alloc for dmtimer%d\n",
 109                                 __func__, i);
 110                         return -ENOMEM;
 111                 }
 112
 113                 memset(res, 0, 2 * sizeof(struct resource));
 114                 res[0].start = base;
 115                 res[0].end = base + 0x46;
 116                 res[0].flags = IORESOURCE_MEM;
 117                 res[1].start = irq;
 118                 res[1].end = irq;
 119                 res[1].flags = IORESOURCE_IRQ;
 120                 ret = platform_device_add_resources(pdev, res,
 121                                 ARRAY_SIZE(res));
 122                 if (ret) {
 123                         dev_err(&pdev->dev, "%s: Failed to add resources.\n",
 124                                 __func__);
 125                         goto err_free_pdev;
 126                 }
 127
 128                 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 129                 if (!pdata) {
 130                         ret = -ENOMEM;
 131                         goto err_free_pdata;
 132                 }
 133
 134                 pdata->set_timer_src = omap1_dm_timer_set_src;
 135                 pdata->timer_capability = OMAP_TIMER_ALWON |
 136                                 OMAP_TIMER_NEEDS_RESET | OMAP_TIMER_HAS_DSP_IRQ;
 137
 138                 ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
 139                 if (ret) {
 140                         dev_err(&pdev->dev, "%s: Failed to add platform data.\n",
 141                                 __func__);
 142                         goto err_free_pdata;
 143                 }
 144
 145                 ret = platform_device_add(pdev);
 146                 if (ret) {
 147                         dev_err(&pdev->dev, "%s: Failed to add platform device.\n",
 148                                 __func__);
 149                         goto err_free_pdata;
 150                 }
 151
 152                 dev_dbg(&pdev->dev, " Registered.\n");
 153         }
 154
 155         return 0;
 156
 157 err_free_pdata:
 158         kfree(pdata);
 159
 160 err_free_pdev:
 161         platform_device_put(pdev);
 162
 163         return ret;
 164 }
 165 arch_initcall(omap1_dm_timer_init);