drivers/clk/at91/at91rm9200.c

Source file repositories/reference/linux-study-clean/drivers/clk/at91/at91rm9200.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/at91/at91rm9200.c
Extension
.c
Size
5731 bytes
Lines
218
Domain
Driver Families
Bucket
drivers/clk
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct sck {
	char *n;
	char *p;
	u8 id;
};

struct pck {
	char *n;
	u8 id;
};

static const struct clk_master_characteristics rm9200_mck_characteristics = {
	.output = { .min = 0, .max = 80000000 },
	.divisors = { 1, 2, 3, 4 },
};

static u8 rm9200_pll_out[] = { 0, 2 };

static const struct clk_range rm9200_pll_outputs[] = {
	{ .min = 80000000, .max = 160000000 },
	{ .min = 150000000, .max = 180000000 },
};

static const struct clk_pll_characteristics rm9200_pll_characteristics = {
	.input = { .min = 1000000, .max = 32000000 },
	.num_output = ARRAY_SIZE(rm9200_pll_outputs),
	.output = rm9200_pll_outputs,
	.out = rm9200_pll_out,
};

static const struct sck at91rm9200_systemck[] = {
	{ .n = "udpck", .p = "usbck",    .id = 1 },
	{ .n = "uhpck", .p = "usbck",    .id = 4 },
	{ .n = "pck0",  .p = "prog0",    .id = 8 },
	{ .n = "pck1",  .p = "prog1",    .id = 9 },
	{ .n = "pck2",  .p = "prog2",    .id = 10 },
	{ .n = "pck3",  .p = "prog3",    .id = 11 },
};

static const struct pck at91rm9200_periphck[] = {
	{ .n = "pioA_clk",   .id = 2 },
	{ .n = "pioB_clk",   .id = 3 },
	{ .n = "pioC_clk",   .id = 4 },
	{ .n = "pioD_clk",   .id = 5 },
	{ .n = "usart0_clk", .id = 6 },
	{ .n = "usart1_clk", .id = 7 },
	{ .n = "usart2_clk", .id = 8 },
	{ .n = "usart3_clk", .id = 9 },
	{ .n = "mci0_clk",   .id = 10 },
	{ .n = "udc_clk",    .id = 11 },
	{ .n = "twi0_clk",   .id = 12 },
	{ .n = "spi0_clk",   .id = 13 },
	{ .n = "ssc0_clk",   .id = 14 },
	{ .n = "ssc1_clk",   .id = 15 },
	{ .n = "ssc2_clk",   .id = 16 },
	{ .n = "tc0_clk",    .id = 17 },
	{ .n = "tc1_clk",    .id = 18 },
	{ .n = "tc2_clk",    .id = 19 },
	{ .n = "tc3_clk",    .id = 20 },
	{ .n = "tc4_clk",    .id = 21 },
	{ .n = "tc5_clk",    .id = 22 },
	{ .n = "ohci_clk",   .id = 23 },
	{ .n = "macb0_clk",  .id = 24 },
};

static void __init at91rm9200_pmc_setup(struct device_node *np)
{
	const char *slowxtal_name, *mainxtal_name;
	struct pmc_data *at91rm9200_pmc;
	u32 usb_div[] = { 1, 2, 0, 0 };
	const char *parent_names[6];
	struct regmap *regmap;
	struct clk_hw *hw;
	int i;
	bool bypass;

	i = of_property_match_string(np, "clock-names", "slow_xtal");
	if (i < 0)
		return;

	slowxtal_name = of_clk_get_parent_name(np, i);

	i = of_property_match_string(np, "clock-names", "main_xtal");
	if (i < 0)
		return;
	mainxtal_name = of_clk_get_parent_name(np, i);

	regmap = device_node_to_regmap(np);
	if (IS_ERR(regmap))
		return;

Annotation

Implementation Notes