drivers/net/wireless/rsi/rsi_91x_sdio.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/rsi/rsi_91x_sdio.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/rsi/rsi_91x_sdio.c
Extension
.c
Size
39756 bytes
Lines
1529
Domain
Driver Families
Bucket
drivers/net
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

if (err) {
			rsi_dbg(ERR_ZONE, "%s: CMD5 failed : %d\n",
				__func__, err);
			break;
		}

		if (resp & MMC_CARD_BUSY)
			break;
		msleep(20);
	}

	if ((i == 100) || (err)) {
		rsi_dbg(ERR_ZONE, "%s: card in not ready : %d %d\n",
			__func__, i, err);
		return;
	}

	/* Issue CMD3, get RCA */
	err = rsi_issue_sdiocommand(pfunction,
				    SD_SEND_RELATIVE_ADDR,
				    0,
				    (MMC_RSP_R6 | MMC_CMD_BCR),
				    &resp);
	if (err) {
		rsi_dbg(ERR_ZONE, "%s: CMD3 failed : %d\n", __func__, err);
		return;
	}
	rca = resp >> 16;
	host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
	host->ops->set_ios(host, &host->ios);

	/* Issue CMD7, select card  */
	err = rsi_issue_sdiocommand(pfunction,
				    MMC_SELECT_CARD,
				    (rca << 16),
				    (MMC_RSP_R1 | MMC_CMD_AC),
				    NULL);
	if (err) {
		rsi_dbg(ERR_ZONE, "%s: CMD7 failed : %d\n", __func__, err);
		return;
	}

	/* Enable high speed */
	if (card->host->caps & MMC_CAP_SD_HIGHSPEED) {
		rsi_dbg(ERR_ZONE, "%s: Set high speed mode\n", __func__);
		err = rsi_cmd52readbyte(card, SDIO_CCCR_SPEED, &cmd52_resp);
		if (err) {
			rsi_dbg(ERR_ZONE, "%s: CCCR speed reg read failed: %d\n",
				__func__, err);
		} else {
			err = rsi_cmd52writebyte(card,
						 SDIO_CCCR_SPEED,
						 (cmd52_resp | SDIO_SPEED_EHS));
			if (err) {
				rsi_dbg(ERR_ZONE,
					"%s: CCR speed regwrite failed %d\n",
					__func__, err);
				return;
			}
			host->ios.timing = MMC_TIMING_SD_HS;
			host->ops->set_ios(host, &host->ios);
		}
	}

	/* Set clock */
	if (mmc_card_hs(card))
		clock = 50000000;
	else
		clock = card->cis.max_dtr;

	if (clock > host->f_max)
		clock = host->f_max;

	host->ios.clock = clock;
	host->ops->set_ios(host, &host->ios);

	if (card->host->caps & MMC_CAP_4_BIT_DATA) {
		/* CMD52: Set bus width & disable card detect resistor */
		err = rsi_cmd52writebyte(card,
					 SDIO_CCCR_IF,
					 (SDIO_BUS_CD_DISABLE |
					  SDIO_BUS_WIDTH_4BIT));
		if (err) {
			rsi_dbg(ERR_ZONE, "%s: Set bus mode failed : %d\n",
				__func__, err);
			return;
		}
		host->ios.bus_width = MMC_BUS_WIDTH_4;
		host->ops->set_ios(host, &host->ios);
	}

Annotation

Implementation Notes