2 * Copyright (C) 2016 Atmel Corporation
3 * Wenyou.Yang <wenyou.yang@atmel.com>
5 * SPDX-License-Identifier: GPL-2.0+
9 #include <clk-uclass.h>
12 #include <mach/at91_pmc.h>
15 #define PERIPHERAL_ID_MIN 2
16 #define PERIPHERAL_ID_MAX 31
17 #define PERIPHERAL_MASK(id) (1 << ((id) & PERIPHERAL_ID_MAX))
19 enum periph_clk_type {
20 CLK_PERIPH_AT91RM9200 = 0,
21 CLK_PERIPH_AT91SAM9X5,
24 * sam9x5_periph_clk_bind() - for the periph clock driver
25 * Recursively bind its children as clk devices.
27 * @return: 0 on success, or negative error code on failure
29 static int sam9x5_periph_clk_bind(struct udevice *dev)
31 return at91_clk_sub_device_bind(dev, "periph-clk");
34 static const struct udevice_id sam9x5_periph_clk_match[] = {
36 .compatible = "atmel,at91rm9200-clk-peripheral",
37 .data = CLK_PERIPH_AT91RM9200,
40 .compatible = "atmel,at91sam9x5-clk-peripheral",
41 .data = CLK_PERIPH_AT91SAM9X5,
46 U_BOOT_DRIVER(sam9x5_periph_clk) = {
47 .name = "sam9x5-periph-clk",
49 .of_match = sam9x5_periph_clk_match,
50 .bind = sam9x5_periph_clk_bind,
53 /*---------------------------------------------------------*/
55 static int periph_clk_enable(struct clk *clk)
57 struct pmc_platdata *plat = dev_get_platdata(clk->dev);
58 struct at91_pmc *pmc = plat->reg_base;
59 enum periph_clk_type clk_type;
62 if (clk->id < PERIPHERAL_ID_MIN)
65 clk_type = dev_get_driver_data(dev_get_parent(clk->dev));
66 if (clk_type == CLK_PERIPH_AT91RM9200) {
68 if (clk->id > PERIPHERAL_ID_MAX)
71 setbits_le32(addr, PERIPHERAL_MASK(clk->id));
73 writel(clk->id & AT91_PMC_PCR_PID_MASK, &pmc->pcr);
74 setbits_le32(&pmc->pcr,
75 AT91_PMC_PCR_CMD_WRITE | AT91_PMC_PCR_EN);
81 static ulong periph_get_rate(struct clk *clk)
88 dev = dev_get_parent(clk->dev);
90 ret = clk_get_by_index(dev, 0, &clk_dev);
94 clk_rate = clk_get_rate(&clk_dev);
101 static struct clk_ops periph_clk_ops = {
102 .of_xlate = at91_clk_of_xlate,
103 .enable = periph_clk_enable,
104 .get_rate = periph_get_rate,
107 U_BOOT_DRIVER(clk_periph) = {
108 .name = "periph-clk",
110 .platdata_auto_alloc_size = sizeof(struct pmc_platdata),
111 .probe = at91_clk_probe,
112 .ops = &periph_clk_ops,