2 * Qualcomm SDHCI driver - SD/eMMC controller
4 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
6 * Based on Linux driver
8 * SPDX-License-Identifier: GPL-2.0+
17 #include <linux/bitops.h>
19 /* Non-standard registers needed for SDHCI startup */
20 #define SDCC_MCI_POWER 0x0
21 #define SDCC_MCI_POWER_SW_RST BIT(7)
23 /* This is undocumented register */
24 #define SDCC_MCI_VERSION 0x50
25 #define SDCC_MCI_VERSION_MAJOR_SHIFT 28
26 #define SDCC_MCI_VERSION_MAJOR_MASK (0xf << SDCC_MCI_VERSION_MAJOR_SHIFT)
27 #define SDCC_MCI_VERSION_MINOR_MASK 0xff
29 #define SDCC_MCI_STATUS2 0x6C
30 #define SDCC_MCI_STATUS2_MCI_ACT 0x1
31 #define SDCC_MCI_HC_MODE 0x78
33 /* Offset to SDHCI registers */
34 #define SDCC_SDHCI_OFFSET 0x900
36 /* Non standard (?) SDHCI register */
37 #define SDHCI_VENDOR_SPEC_CAPABILITIES0 0x11c
40 struct sdhci_host host;
44 DECLARE_GLOBAL_DATA_PTR;
46 static int msm_sdc_clk_init(struct udevice *dev)
48 uint clk_rate = fdtdec_get_uint(gd->fdt_blob, dev->of_offset,
49 "clock-frequency", 400000);
50 uint clkd[2]; /* clk_id and clk_no */
52 struct udevice *clk_dev;
56 ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "clock", clkd,
61 clk_offset = fdt_node_offset_by_phandle(gd->fdt_blob, clkd[0]);
65 ret = uclass_get_device_by_of_offset(UCLASS_CLK, clk_offset, &clk_dev);
70 ret = clk_request(clk_dev, &clk);
74 ret = clk_set_rate(&clk, clk_rate);
82 static int msm_sdc_probe(struct udevice *dev)
84 struct msm_sdhc *prv = dev_get_priv(dev);
85 struct sdhci_host *host = &prv->host;
86 u32 core_version, core_minor, core_major;
89 host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_BROKEN_R1B;
92 ret = msm_sdc_clk_init(dev);
96 /* Reset the core and Enable SDHC mode */
97 writel(readl(prv->base + SDCC_MCI_POWER) | SDCC_MCI_POWER_SW_RST,
98 prv->base + SDCC_MCI_POWER);
101 /* Wait for reset to be written to register */
102 if (wait_for_bit(__func__, prv->base + SDCC_MCI_STATUS2,
103 SDCC_MCI_STATUS2_MCI_ACT, false, 10, false)) {
104 printf("msm_sdhci: reset request failed\n");
108 /* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
109 if (wait_for_bit(__func__, prv->base + SDCC_MCI_POWER,
110 SDCC_MCI_POWER_SW_RST, false, 2, false)) {
111 printf("msm_sdhci: stuck in reset\n");
115 /* Enable host-controller mode */
116 writel(1, prv->base + SDCC_MCI_HC_MODE);
118 core_version = readl(prv->base + SDCC_MCI_VERSION);
120 core_major = (core_version & SDCC_MCI_VERSION_MAJOR_MASK);
121 core_major >>= SDCC_MCI_VERSION_MAJOR_SHIFT;
123 core_minor = core_version & SDCC_MCI_VERSION_MINOR_MASK;
126 * Support for some capabilities is not advertised by newer
127 * controller versions and must be explicitly enabled.
129 if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) {
130 u32 caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
131 caps |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT;
132 writel(caps, host->ioaddr + SDHCI_VENDOR_SPEC_CAPABILITIES0);
135 /* Set host controller version */
136 host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
138 /* automatically detect max and min speed */
139 return add_sdhci(host, 0, 0);
142 static int msm_sdc_remove(struct udevice *dev)
144 struct msm_sdhc *priv = dev_get_priv(dev);
146 /* Disable host-controller mode */
147 writel(0, priv->base + SDCC_MCI_HC_MODE);
152 static int msm_ofdata_to_platdata(struct udevice *dev)
154 struct udevice *parent = dev->parent;
155 struct msm_sdhc *priv = dev_get_priv(dev);
156 struct sdhci_host *host = &priv->host;
158 host->name = strdup(dev->name);
159 host->ioaddr = (void *)dev_get_addr(dev);
160 host->bus_width = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
162 host->index = fdtdec_get_uint(gd->fdt_blob, dev->of_offset, "index", 0);
163 priv->base = (void *)fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
167 if (priv->base == (void *)FDT_ADDR_T_NONE ||
168 host->ioaddr == (void *)FDT_ADDR_T_NONE)
174 static const struct udevice_id msm_mmc_ids[] = {
175 { .compatible = "qcom,sdhci-msm-v4" },
179 U_BOOT_DRIVER(msm_sdc_drv) = {
182 .of_match = msm_mmc_ids,
183 .ofdata_to_platdata = msm_ofdata_to_platdata,
184 .probe = msm_sdc_probe,
185 .remove = msm_sdc_remove,
186 .priv_auto_alloc_size = sizeof(struct msm_sdhc),