drivers/clk/mmp/clk-pxa1908-apmu.c

Source file repositories/reference/linux-study-clean/drivers/clk/mmp/clk-pxa1908-apmu.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/mmp/clk-pxa1908-apmu.c
Extension
.c
Size
4364 bytes
Lines
129
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 pxa1908_clk_unit {
	struct mmp_clk_unit unit;
	void __iomem *base;
};

static DEFINE_SPINLOCK(pll1_lock);
static struct mmp_param_general_gate_clk pll1_gate_clks[] = {
	{PXA1908_CLK_PLL1_D2_GATE, "pll1_d2_gate", "pll1_d2", 0, APMU_CLK_GATE_CTRL, 29, 0, &pll1_lock},
	{PXA1908_CLK_PLL1_416_GATE, "pll1_416_gate", "pll1_416", 0, APMU_CLK_GATE_CTRL, 27, 0, &pll1_lock},
	{PXA1908_CLK_PLL1_624_GATE, "pll1_624_gate", "pll1_624", 0, APMU_CLK_GATE_CTRL, 26, 0, &pll1_lock},
	{PXA1908_CLK_PLL1_832_GATE, "pll1_832_gate", "pll1_832", 0, APMU_CLK_GATE_CTRL, 30, 0, &pll1_lock},
	{PXA1908_CLK_PLL1_1248_GATE, "pll1_1248_gate", "pll1_1248", 0, APMU_CLK_GATE_CTRL, 28, 0, &pll1_lock},
};

static DEFINE_SPINLOCK(sdh0_lock);
static DEFINE_SPINLOCK(sdh1_lock);
static DEFINE_SPINLOCK(sdh2_lock);

static const char * const sdh_parent_names[] = {"pll1_416", "pll1_624"};

static struct mmp_clk_mix_config sdh_mix_config = {
	.reg_info = DEFINE_MIX_REG_INFO(3, 8, 2, 6, 11),
};

static struct mmp_param_gate_clk apmu_gate_clks[] = {
	{PXA1908_CLK_USB, "usb_clk", NULL, 0, APMU_USB, 0x9, 0x9, 0x1, 0, NULL},
	{PXA1908_CLK_SDH0, "sdh0_clk", "sdh0_mix_clk", CLK_SET_RATE_PARENT | CLK_SET_RATE_UNGATE, APMU_SDH0, 0x12, 0x12, 0x0, 0, &sdh0_lock},
	{PXA1908_CLK_SDH1, "sdh1_clk", "sdh1_mix_clk", CLK_SET_RATE_PARENT | CLK_SET_RATE_UNGATE, APMU_SDH1, 0x12, 0x12, 0x0, 0, &sdh1_lock},
	{PXA1908_CLK_SDH2, "sdh2_clk", "sdh2_mix_clk", CLK_SET_RATE_PARENT | CLK_SET_RATE_UNGATE, APMU_SDH2, 0x12, 0x12, 0x0, 0, &sdh2_lock}
};

static void pxa1908_axi_periph_clk_init(struct pxa1908_clk_unit *pxa_unit)
{
	struct mmp_clk_unit *unit = &pxa_unit->unit;

	mmp_register_general_gate_clks(unit, pll1_gate_clks,
			pxa_unit->base, ARRAY_SIZE(pll1_gate_clks));

	sdh_mix_config.reg_info.reg_clk_ctrl = pxa_unit->base + APMU_SDH0;
	mmp_clk_register_mix(NULL, "sdh0_mix_clk", sdh_parent_names,
			ARRAY_SIZE(sdh_parent_names), CLK_SET_RATE_PARENT,
			&sdh_mix_config, &sdh0_lock);
	sdh_mix_config.reg_info.reg_clk_ctrl = pxa_unit->base + APMU_SDH1;
	mmp_clk_register_mix(NULL, "sdh1_mix_clk", sdh_parent_names,
			ARRAY_SIZE(sdh_parent_names), CLK_SET_RATE_PARENT,
			&sdh_mix_config, &sdh1_lock);
	sdh_mix_config.reg_info.reg_clk_ctrl = pxa_unit->base + APMU_SDH2;
	mmp_clk_register_mix(NULL, "sdh2_mix_clk", sdh_parent_names,
			ARRAY_SIZE(sdh_parent_names), CLK_SET_RATE_PARENT,
			&sdh_mix_config, &sdh2_lock);

	mmp_register_gate_clks(unit, apmu_gate_clks, pxa_unit->base,
			ARRAY_SIZE(apmu_gate_clks));
}

static int pxa1908_apmu_probe(struct platform_device *pdev)
{
	struct pxa1908_clk_unit *pxa_unit;
	struct auxiliary_device *adev;

	pxa_unit = devm_kzalloc(&pdev->dev, sizeof(*pxa_unit), GFP_KERNEL);
	if (!pxa_unit)
		return -ENOMEM;

	pxa_unit->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(pxa_unit->base))
		return PTR_ERR(pxa_unit->base);

	adev = devm_auxiliary_device_create(&pdev->dev, "power", NULL);
	if (IS_ERR(adev))
		return dev_err_probe(&pdev->dev, PTR_ERR(adev),
				     "Failed to register power controller\n");

	mmp_clk_init(pdev->dev.of_node, &pxa_unit->unit, APMU_NR_CLKS);

	pxa1908_axi_periph_clk_init(pxa_unit);

	return 0;
}

static const struct of_device_id pxa1908_apmu_match_table[] = {
	{ .compatible = "marvell,pxa1908-apmu" },
	{ }
};
MODULE_DEVICE_TABLE(of, pxa1908_apmu_match_table);

static struct platform_driver pxa1908_apmu_driver = {
	.probe = pxa1908_apmu_probe,
	.driver = {
		.name = "pxa1908-apmu",

Annotation

Implementation Notes