drivers/misc/cardreader/rts5228.c

Source file repositories/reference/linux-study-clean/drivers/misc/cardreader/rts5228.c

File Facts

System
Linux kernel
Corpus path
drivers/misc/cardreader/rts5228.c
Extension
.c
Size
20124 bytes
Lines
732
Domain
Driver Families
Bucket
drivers/misc
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 (pcr->ops->conv_clk_and_div_n) {
			int dbl_clk = pcr->ops->conv_clk_and_div_n(n,
					DIV_N_TO_CLK) * 2;
			n = pcr->ops->conv_clk_and_div_n(dbl_clk,
					CLK_TO_DIV_N);
		} else {
			n = (n + 4) * 2 - 4;
		}
		div++;
	}

	n = (n / 2) - 1;
	pcr_dbg(pcr, "n = %d, div = %d\n", n, div);

	ssc_depth = depth[ssc_depth];
	if (double_clk)
		ssc_depth = double_ssc_depth(ssc_depth);

	if (ssc_depth) {
		if (div == CLK_DIV_2) {
			if (ssc_depth > 1)
				ssc_depth -= 1;
			else
				ssc_depth = RTS5228_SSC_DEPTH_8M;
		} else if (div == CLK_DIV_4) {
			if (ssc_depth > 2)
				ssc_depth -= 2;
			else
				ssc_depth = RTS5228_SSC_DEPTH_8M;
		} else if (div == CLK_DIV_8) {
			if (ssc_depth > 3)
				ssc_depth -= 3;
			else
				ssc_depth = RTS5228_SSC_DEPTH_8M;
		}
	} else {
		ssc_depth = 0;
	}
	pcr_dbg(pcr, "ssc_depth = %d\n", ssc_depth);

	rtsx_pci_init_cmd(pcr);
	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_CTL,
				CLK_LOW_FREQ, CLK_LOW_FREQ);
	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CLK_DIV,
			0xFF, (div << 4) | mcu_cnt);
	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_CTL1, SSC_RSTB, 0);
	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_CTL2,
			SSC_DEPTH_MASK, ssc_depth);
	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_DIV_N_0, 0xFF, n);
	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SSC_CTL1, SSC_RSTB, SSC_RSTB);
	if (vpclk) {
		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_VPCLK0_CTL,
				PHASE_NOT_RESET, 0);
		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_VPCLK1_CTL,
				PHASE_NOT_RESET, 0);
		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_VPCLK0_CTL,
				PHASE_NOT_RESET, PHASE_NOT_RESET);
		rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD_VPCLK1_CTL,
				PHASE_NOT_RESET, PHASE_NOT_RESET);
	}

	err = rtsx_pci_send_cmd(pcr, 2000);
	if (err < 0)
		return err;

	/* Wait SSC clock stable */
	udelay(SSC_CLOCK_STABLE_WAIT);
	err = rtsx_pci_write_register(pcr, CLK_CTL, CLK_LOW_FREQ, 0);
	if (err < 0)
		return err;

	pcr->cur_clock = clk;
	return 0;

}

void rts5228_init_params(struct rtsx_pcr *pcr)
{
	struct rtsx_cr_option *option = &pcr->option;
	struct rtsx_hw_param *hw_param = &pcr->hw_param;

	pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
	pcr->num_slots = 1;
	pcr->ops = &rts5228_pcr_ops;

	pcr->flags = 0;
	pcr->card_drive_sel = RTSX_CARD_DRIVE_DEFAULT;
	pcr->sd30_drive_sel_1v8 = CFG_DRIVER_TYPE_B;
	pcr->sd30_drive_sel_3v3 = CFG_DRIVER_TYPE_B;
	pcr->aspm_en = ASPM_L1_EN;

Annotation

Implementation Notes