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[u-boot] / drivers / timer / atcpit100_timer.c
1 /*
2  * Andestech ATCPIT100 timer driver
3  *
4  * (C) Copyright 2016
5  * Rick Chen, NDS32 Software Engineering, rick@andestech.com
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9 #include <common.h>
10 #include <dm.h>
11 #include <errno.h>
12 #include <timer.h>
13 #include <linux/io.h>
14
15 DECLARE_GLOBAL_DATA_PTR;
16
17 #define REG32_TMR(x)    (*(u32 *)       ((plat->regs) + (x>>2)))
18
19 /*
20  * Definition of register offsets
21  */
22
23 /* ID and Revision Register */
24 #define ID_REV          0x0
25
26 /* Configuration Register */
27 #define CFG             0x10
28
29 /* Interrupt Enable Register */
30 #define INT_EN          0x14
31 #define CH_INT_EN(c , i)        ((1<<i)<<(4*c))
32
33 /* Interrupt Status Register */
34 #define INT_STA         0x18
35 #define CH_INT_STA(c , i)       ((1<<i)<<(4*c))
36
37 /* Channel Enable Register */
38 #define CH_EN           0x1C
39 #define CH_TMR_EN(c , t)        ((1<<t)<<(4*c))
40
41 /* Ch n Control REgister */
42 #define CH_CTL(n)       (0x20+0x10*n)
43 /* Channel clock source , bit 3 , 0:External clock , 1:APB clock */
44 #define APB_CLK         (1<<3)
45 /* Channel mode , bit 0~2 */
46 #define TMR_32          1
47 #define TMR_16          2
48 #define TMR_8           3
49 #define PWM             4
50
51 #define CH_REL(n)       (0x24+0x10*n)
52 #define CH_CNT(n)       (0x28+0x10*n)
53
54 struct atctmr_timer_regs {
55         u32     id_rev;         /* 0x00 */
56         u32     reservd[3];     /* 0x04 ~ 0x0c */
57         u32     cfg;            /* 0x10 */
58         u32     int_en;         /* 0x14 */
59         u32     int_st;         /* 0x18 */
60         u32     ch_en;          /* 0x1c */
61         u32     ch0_ctrl;       /* 0x20 */
62         u32     ch0_reload;     /* 0x24 */
63         u32     ch0_cntr;       /* 0x28 */
64         u32     reservd1;       /* 0x2c */
65         u32     ch1_ctrl;       /* 0x30 */
66         u32     ch1_reload;     /* 0x34 */
67         u32     int_mask;       /* 0x38 */
68 };
69
70 struct atcpit_timer_platdata {
71         u32 *regs;
72 };
73
74 static int atcpit_timer_get_count(struct udevice *dev, u64 *count)
75 {
76         struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
77         u32 val;
78         val = ~(REG32_TMR(CH_CNT(1))+0xffffffff);
79         *count = timer_conv_64(val);
80         return 0;
81 }
82
83 static int atcpit_timer_probe(struct udevice *dev)
84 {
85         struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
86         REG32_TMR(CH_REL(1)) = 0xffffffff;
87         REG32_TMR(CH_CTL(1)) = APB_CLK|TMR_32;
88         REG32_TMR(CH_EN) |= CH_TMR_EN(1 , 0);
89         return 0;
90 }
91
92 static int atcpit_timer_ofdata_to_platdata(struct udevice *dev)
93 {
94         struct atcpit_timer_platdata *plat = dev_get_platdata(dev);
95         plat->regs = map_physmem(devfdt_get_addr(dev) , 0x100 , MAP_NOCACHE);
96         return 0;
97 }
98
99 static const struct timer_ops atcpit_timer_ops = {
100         .get_count = atcpit_timer_get_count,
101 };
102
103 static const struct udevice_id atcpit_timer_ids[] = {
104         { .compatible = "andestech,atcpit100" },
105         {}
106 };
107
108 U_BOOT_DRIVER(atcpit100_timer) = {
109         .name   = "atcpit100_timer",
110         .id     = UCLASS_TIMER,
111         .of_match = atcpit_timer_ids,
112         .ofdata_to_platdata = atcpit_timer_ofdata_to_platdata,
113         .platdata_auto_alloc_size = sizeof(struct atcpit_timer_platdata),
114         .probe = atcpit_timer_probe,
115         .ops    = &atcpit_timer_ops,
116         .flags = DM_FLAG_PRE_RELOC,
117 };