1 /*
2  * Copyright (C) 2016 Atmel Corporation
3  *               Wenyou.Yang <wenyou.yang@atmel.com>
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 #include <common.h>
9 #include <clk-uclass.h>
10 #include <dm/device.h>
11 #include <linux/io.h>
12 #include <mach/at91_pmc.h>
13 #include "pmc.h"
14 
15 #define PERIPHERAL_ID_MIN	2
16 #define PERIPHERAL_ID_MAX	31
17 #define PERIPHERAL_MASK(id)	(1 << ((id) & PERIPHERAL_ID_MAX))
18 
19 static int sam9x5_periph_clk_enable(struct clk *clk)
20 {
21 	struct pmc_platdata *plat = dev_get_platdata(clk->dev);
22 	struct at91_pmc *pmc = plat->reg_base;
23 
24 	if (clk->id < PERIPHERAL_ID_MIN)
25 		return -1;
26 
27 	writel(clk->id & AT91_PMC_PCR_PID_MASK, &pmc->pcr);
28 	setbits_le32(&pmc->pcr, AT91_PMC_PCR_CMD_WRITE | AT91_PMC_PCR_EN);
29 
30 	return 0;
31 }
32 
33 static struct clk_ops sam9x5_periph_clk_ops = {
34 	.enable = sam9x5_periph_clk_enable,
35 };
36 
37 static int sam9x5_periph_clk_bind(struct udevice *dev)
38 {
39 	return at91_pmc_clk_node_bind(dev);
40 }
41 
42 static int sam9x5_periph_clk_probe(struct udevice *dev)
43 {
44 	return at91_pmc_core_probe(dev);
45 }
46 
47 static const struct udevice_id sam9x5_periph_clk_match[] = {
48 	{ .compatible = "atmel,at91sam9x5-clk-peripheral" },
49 	{}
50 };
51 
52 U_BOOT_DRIVER(sam9x5_periph_clk) = {
53 	.name = "sam9x5-periph-clk",
54 	.id = UCLASS_CLK,
55 	.of_match = sam9x5_periph_clk_match,
56 	.bind = sam9x5_periph_clk_bind,
57 	.probe = sam9x5_periph_clk_probe,
58 	.platdata_auto_alloc_size = sizeof(struct pmc_platdata),
59 	.ops = &sam9x5_periph_clk_ops,
60 };
61