arch/arm/mach-omap1/mcbsp.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap1/mcbsp.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap1/mcbsp.c
Extension
.c
Size
6783 bytes
Lines
345
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (dsp_use++ == 0) {
			api_clk = clk_get(NULL, "api_ck");
			dsp_clk = clk_get(NULL, "dsp_ck");
			if (!IS_ERR(api_clk) && !IS_ERR(dsp_clk)) {
				clk_prepare_enable(api_clk);
				clk_prepare_enable(dsp_clk);

				/*
				 * DSP external peripheral reset
				 * FIXME: This should be moved to dsp code
				 */
				__raw_writew(__raw_readw(DSP_RSTCT2) | DPS_RSTCT2_PER_EN |
						DSP_RSTCT2_WD_PER_EN, DSP_RSTCT2);
			}
		}
	}
}

static void omap1_mcbsp_free(unsigned int id)
{
	if (id == 0 || id == 2) {
		if (--dsp_use == 0) {
			if (!IS_ERR(api_clk)) {
				clk_disable_unprepare(api_clk);
				clk_put(api_clk);
			}
			if (!IS_ERR(dsp_clk)) {
				clk_disable_unprepare(dsp_clk);
				clk_put(dsp_clk);
			}
		}
	}
}

static struct omap_mcbsp_ops omap1_mcbsp_ops = {
	.request	= omap1_mcbsp_request,
	.free		= omap1_mcbsp_free,
};

#define OMAP7XX_MCBSP1_BASE	0xfffb1000
#define OMAP7XX_MCBSP2_BASE	0xfffb1800

#define OMAP1510_MCBSP1_BASE	0xe1011800
#define OMAP1510_MCBSP2_BASE	0xfffb1000
#define OMAP1510_MCBSP3_BASE	0xe1017000

#define OMAP1610_MCBSP1_BASE	0xe1011800
#define OMAP1610_MCBSP2_BASE	0xfffb1000
#define OMAP1610_MCBSP3_BASE	0xe1017000

struct resource omap15xx_mcbsp_res[][6] = {
	{
		{
			.start = OMAP1510_MCBSP1_BASE,
			.end   = OMAP1510_MCBSP1_BASE + SZ_256,
			.flags = IORESOURCE_MEM,
		},
		{
			.name  = "rx",
			.start = INT_McBSP1RX,
			.flags = IORESOURCE_IRQ,
		},
		{
			.name  = "tx",
			.start = INT_McBSP1TX,
			.flags = IORESOURCE_IRQ,
		},
		{
			.name  = "rx",
			.start = 9,
			.flags = IORESOURCE_DMA,
		},
		{
			.name  = "tx",
			.start = 8,
			.flags = IORESOURCE_DMA,
		},
	},
	{
		{
			.start = OMAP1510_MCBSP2_BASE,
			.end   = OMAP1510_MCBSP2_BASE + SZ_256,
			.flags = IORESOURCE_MEM,
		},
		{
			.name  = "rx",
			.start = INT_1510_SPI_RX,
			.flags = IORESOURCE_IRQ,
		},
		{

Annotation

Implementation Notes