timer.c
4.09 KB
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/**
* OMAP1 Dual-Mode Timers - platform device registration
*
* Contains first level initialization routines which internally
* generates timer device information and registers with linux
* device model. It also has low level function to chnage the timer
* input clock source.
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
* Tarun Kanti DebBarma <tarun.kanti@ti.com>
* Thara Gopinath <thara@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/platform_data/dmtimer-omap.h>
#include <mach/irqs.h>
#include <plat/dmtimer.h>
#define OMAP1610_GPTIMER1_BASE 0xfffb1400
#define OMAP1610_GPTIMER2_BASE 0xfffb1c00
#define OMAP1610_GPTIMER3_BASE 0xfffb2400
#define OMAP1610_GPTIMER4_BASE 0xfffb2c00
#define OMAP1610_GPTIMER5_BASE 0xfffb3400
#define OMAP1610_GPTIMER6_BASE 0xfffb3c00
#define OMAP1610_GPTIMER7_BASE 0xfffb7400
#define OMAP1610_GPTIMER8_BASE 0xfffbd400
#define OMAP1_DM_TIMER_COUNT 8
static int omap1_dm_timer_set_src(struct platform_device *pdev,
int source)
{
int n = (pdev->id - 1) << 1;
u32 l;
l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
l |= source << n;
omap_writel(l, MOD_CONF_CTRL_1);
return 0;
}
static int __init omap1_dm_timer_init(void)
{
int i;
int ret;
struct dmtimer_platform_data *pdata;
struct platform_device *pdev;
if (!cpu_is_omap16xx())
return 0;
for (i = 1; i <= OMAP1_DM_TIMER_COUNT; i++) {
struct resource res[2];
u32 base, irq;
switch (i) {
case 1:
base = OMAP1610_GPTIMER1_BASE;
irq = INT_1610_GPTIMER1;
break;
case 2:
base = OMAP1610_GPTIMER2_BASE;
irq = INT_1610_GPTIMER2;
break;
case 3:
base = OMAP1610_GPTIMER3_BASE;
irq = INT_1610_GPTIMER3;
break;
case 4:
base = OMAP1610_GPTIMER4_BASE;
irq = INT_1610_GPTIMER4;
break;
case 5:
base = OMAP1610_GPTIMER5_BASE;
irq = INT_1610_GPTIMER5;
break;
case 6:
base = OMAP1610_GPTIMER6_BASE;
irq = INT_1610_GPTIMER6;
break;
case 7:
base = OMAP1610_GPTIMER7_BASE;
irq = INT_1610_GPTIMER7;
break;
case 8:
base = OMAP1610_GPTIMER8_BASE;
irq = INT_1610_GPTIMER8;
break;
default:
/*
* not supposed to reach here.
* this is to remove warning.
*/
return -EINVAL;
}
pdev = platform_device_alloc("omap_timer", i);
if (!pdev) {
pr_err("%s: Failed to device alloc for dmtimer%d\n",
__func__, i);
return -ENOMEM;
}
memset(res, 0, 2 * sizeof(struct resource));
res[0].start = base;
res[0].end = base + 0x46;
res[0].flags = IORESOURCE_MEM;
res[1].start = irq;
res[1].end = irq;
res[1].flags = IORESOURCE_IRQ;
ret = platform_device_add_resources(pdev, res,
ARRAY_SIZE(res));
if (ret) {
dev_err(&pdev->dev, "%s: Failed to add resources.\n",
__func__);
goto err_free_pdev;
}
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(&pdev->dev, "%s: Failed to allocate pdata.\n",
__func__);
ret = -ENOMEM;
goto err_free_pdata;
}
pdata->set_timer_src = omap1_dm_timer_set_src;
pdata->timer_capability = OMAP_TIMER_ALWON |
OMAP_TIMER_NEEDS_RESET | OMAP_TIMER_HAS_DSP_IRQ;
ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
if (ret) {
dev_err(&pdev->dev, "%s: Failed to add platform data.\n",
__func__);
goto err_free_pdata;
}
ret = platform_device_add(pdev);
if (ret) {
dev_err(&pdev->dev, "%s: Failed to add platform device.\n",
__func__);
goto err_free_pdata;
}
dev_dbg(&pdev->dev, " Registered.\n");
}
return 0;
err_free_pdata:
kfree(pdata);
err_free_pdev:
platform_device_unregister(pdev);
return ret;
}
arch_initcall(omap1_dm_timer_init);