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ARM: Implement non-cached memory support
[people/ms/u-boot.git] / drivers / watchdog / xilinx_tb_wdt.c
1 /*
2 * Copyright (c) 2011-2013 Xilinx Inc.
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7 #include <common.h>
8 #include <asm/io.h>
9 #include <asm/microblaze_intc.h>
10 #include <asm/processor.h>
11 #include <watchdog.h>
12
13 #define XWT_CSR0_WRS_MASK 0x00000008 /* Reset status Mask */
14 #define XWT_CSR0_WDS_MASK 0x00000004 /* Timer state Mask */
15 #define XWT_CSR0_EWDT1_MASK 0x00000002 /* Enable bit 1 Mask*/
16 #define XWT_CSRX_EWDT2_MASK 0x00000001 /* Enable bit 2 Mask */
17
18 struct watchdog_regs {
19 u32 twcsr0; /* 0x0 */
20 u32 twcsr1; /* 0x4 */
21 u32 tbr; /* 0x8 */
22 };
23
24 static struct watchdog_regs *watchdog_base =
25 (struct watchdog_regs *)CONFIG_WATCHDOG_BASEADDR;
26
27 void hw_watchdog_reset(void)
28 {
29 u32 reg;
30
31 /* Read the current contents of TCSR0 */
32 reg = readl(&watchdog_base->twcsr0);
33
34 /* Clear the watchdog WDS bit */
35 if (reg & (XWT_CSR0_EWDT1_MASK | XWT_CSRX_EWDT2_MASK))
36 writel(reg | XWT_CSR0_WDS_MASK, &watchdog_base->twcsr0);
37 }
38
39 void hw_watchdog_disable(void)
40 {
41 u32 reg;
42
43 /* Read the current contents of TCSR0 */
44 reg = readl(&watchdog_base->twcsr0);
45
46 writel(reg & ~XWT_CSR0_EWDT1_MASK, &watchdog_base->twcsr0);
47 writel(~XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1);
48
49 puts("Watchdog disabled!\n");
50 }
51
52 static void hw_watchdog_isr(void *arg)
53 {
54 hw_watchdog_reset();
55 }
56
57 void hw_watchdog_init(void)
58 {
59 int ret;
60
61 writel((XWT_CSR0_WRS_MASK | XWT_CSR0_WDS_MASK | XWT_CSR0_EWDT1_MASK),
62 &watchdog_base->twcsr0);
63 writel(XWT_CSRX_EWDT2_MASK, &watchdog_base->twcsr1);
64
65 ret = install_interrupt_handler(CONFIG_WATCHDOG_IRQ,
66 hw_watchdog_isr, NULL);
67 if (ret)
68 puts("Watchdog IRQ registration failed.");
69 }