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Merge branch 'master' of git://git.denx.de/u-boot-sunxi
[u-boot] / drivers / timer / atcpit100_timer.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Andestech ATCPIT100 timer driver
4  *
5  * (C) Copyright 2016
6  * Rick Chen, NDS32 Software Engineering, rick@andestech.com
7  */
8 #include <common.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <timer.h>
12 #include <linux/io.h>
13
14 #define REG32_TMR(x)    (*(u32 *)       ((plat->regs) + (x>>2)))
15
16 /*
17  * Definition of register offsets
18  */
19
20 /* ID and Revision Register */
21 #define ID_REV          0x0
22
23 /* Configuration Register */
24 #define CFG             0x10
25
26 /* Interrupt Enable Register */
27 #define INT_EN          0x14
28 #define CH_INT_EN(c , i)        ((1<<i)<<(4*c))
29
30 /* Interrupt Status Register */
31 #define INT_STA         0x18
32 #define CH_INT_STA(c , i)       ((1<<i)<<(4*c))
33
34 /* Channel Enable Register */
35 #define CH_EN           0x1C
36 #define CH_TMR_EN(c , t)        ((1<<t)<<(4*c))
37
38 /* Ch n Control REgister */
39 #define CH_CTL(n)       (0x20+0x10*n)
40 /* Channel clock source , bit 3 , 0:External clock , 1:APB clock */
41 #define APB_CLK         (1<<3)
42 /* Channel mode , bit 0~2 */
43 #define TMR_32          1
44 #define TMR_16          2
45 #define TMR_8           3
46 #define PWM             4
47
48 #define CH_REL(n)       (0x24+0x10*n)
49 #define CH_CNT(n)       (0x28+0x10*n)
50
51 struct atctmr_timer_regs {
52         u32     id_rev;         /* 0x00 */
53         u32     reservd[3];     /* 0x04 ~ 0x0c */
54         u32     cfg;            /* 0x10 */
55         u32     int_en;         /* 0x14 */
56         u32     int_st;         /* 0x18 */
57         u32     ch_en;          /* 0x1c */
58         u32     ch0_ctrl;       /* 0x20 */
59         u32     ch0_reload;     /* 0x24 */
60         u32     ch0_cntr;       /* 0x28 */
61         u32     reservd1;       /* 0x2c */
62         u32     ch1_ctrl;       /* 0x30 */
63         u32     ch1_reload;     /* 0x34 */
64         u32     int_mask;       /* 0x38 */
65 };
66
67 struct atcpit_timer_platdata {
68         u32 *regs;
69 };
70
71 static int atcpit_timer_get_count(struct udevice *dev, u64 *count)
72 {
73         struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
74         u32 val;
75         val = ~(REG32_TMR(CH_CNT(1))+0xffffffff);
76         *count = timer_conv_64(val);
77         return 0;
78 }
79
80 static int atcpit_timer_probe(struct udevice *dev)
81 {
82         struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
83         REG32_TMR(CH_REL(1)) = 0xffffffff;
84         REG32_TMR(CH_CTL(1)) = APB_CLK|TMR_32;
85         REG32_TMR(CH_EN) |= CH_TMR_EN(1 , 0);
86         return 0;
87 }
88
89 static int atcpit_timer_ofdata_to_platdata(struct udevice *dev)
90 {
91         struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
92         plat->regs = map_physmem(devfdt_get_addr(dev) , 0x100 , MAP_NOCACHE);
93         return 0;
94 }
95
96 static const struct timer_ops atcpit_timer_ops = {
97         .get_count = atcpit_timer_get_count,
98 };
99
100 static const struct udevice_id atcpit_timer_ids[] = {
101         { .compatible = "andestech,atcpit100" },
102         {}
103 };
104
105 U_BOOT_DRIVER(atcpit100_timer) = {
106         .name   = "atcpit100_timer",
107         .id     = UCLASS_TIMER,
108         .of_match = atcpit_timer_ids,
109         .ofdata_to_platdata = atcpit_timer_ofdata_to_platdata,
110         .platdata_auto_alloc_size = sizeof(struct atcpit_timer_platdata),
111         .probe = atcpit_timer_probe,
112         .ops    = &atcpit_timer_ops,
113         .flags = DM_FLAG_PRE_RELOC,
114 };