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
39 struct msm_sdhc_plat {
40 struct mmc_config cfg;
45 struct sdhci_host host;
49 DECLARE_GLOBAL_DATA_PTR;
51 static int msm_sdc_clk_init(struct udevice *dev)
53 int node = dev_of_offset(dev);
54 uint clk_rate = fdtdec_get_uint(gd->fdt_blob, node, "clock-frequency",
56 uint clkd[2]; /* clk_id and clk_no */
58 struct udevice *clk_dev;
62 ret = fdtdec_get_int_array(gd->fdt_blob, node, "clock", clkd, 2);
66 clk_offset = fdt_node_offset_by_phandle(gd->fdt_blob, clkd[0]);
70 ret = uclass_get_device_by_of_offset(UCLASS_CLK, clk_offset, &clk_dev);
75 ret = clk_request(clk_dev, &clk);
79 ret = clk_set_rate(&clk, clk_rate);
87 static int msm_sdc_probe(struct udevice *dev)
89 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
90 struct msm_sdhc_plat *plat = dev_get_platdata(dev);
91 struct msm_sdhc *prv = dev_get_priv(dev);
92 struct sdhci_host *host = &prv->host;
93 u32 core_version, core_minor, core_major;
97 host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_BROKEN_R1B;
102 ret = msm_sdc_clk_init(dev);
106 /* Reset the core and Enable SDHC mode */
107 writel(readl(prv->base + SDCC_MCI_POWER) | SDCC_MCI_POWER_SW_RST,
108 prv->base + SDCC_MCI_POWER);
111 /* Wait for reset to be written to register */
112 if (wait_for_bit(__func__, prv->base + SDCC_MCI_STATUS2,
113 SDCC_MCI_STATUS2_MCI_ACT, false, 10, false)) {
114 printf("msm_sdhci: reset request failed\n");
118 /* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
119 if (wait_for_bit(__func__, prv->base + SDCC_MCI_POWER,
120 SDCC_MCI_POWER_SW_RST, false, 2, false)) {
121 printf("msm_sdhci: stuck in reset\n");
125 /* Enable host-controller mode */
126 writel(1, prv->base + SDCC_MCI_HC_MODE);
128 core_version = readl(prv->base + SDCC_MCI_VERSION);
130 core_major = (core_version & SDCC_MCI_VERSION_MAJOR_MASK);
131 core_major >>= SDCC_MCI_VERSION_MAJOR_SHIFT;
133 core_minor = core_version & SDCC_MCI_VERSION_MINOR_MASK;
136 * Support for some capabilities is not advertised by newer
137 * controller versions and must be explicitly enabled.
139 if (core_major >= 1 && core_minor != 0x11 && core_minor != 0x12) {
140 caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
141 caps |= SDHCI_CAN_VDD_300 | SDHCI_CAN_DO_8BIT;
142 writel(caps, host->ioaddr + SDHCI_VENDOR_SPEC_CAPABILITIES0);
145 ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
146 host->mmc = &plat->mmc;
149 host->mmc->priv = &prv->host;
150 host->mmc->dev = dev;
151 upriv->mmc = host->mmc;
153 return sdhci_probe(dev);
156 static int msm_sdc_remove(struct udevice *dev)
158 struct msm_sdhc *priv = dev_get_priv(dev);
160 /* Disable host-controller mode */
161 writel(0, priv->base + SDCC_MCI_HC_MODE);
166 static int msm_ofdata_to_platdata(struct udevice *dev)
168 struct udevice *parent = dev->parent;
169 struct msm_sdhc *priv = dev_get_priv(dev);
170 struct sdhci_host *host = &priv->host;
171 int node = dev_of_offset(dev);
173 host->name = strdup(dev->name);
174 host->ioaddr = (void *)devfdt_get_addr(dev);
175 host->bus_width = fdtdec_get_int(gd->fdt_blob, node, "bus-width", 4);
176 host->index = fdtdec_get_uint(gd->fdt_blob, node, "index", 0);
177 priv->base = (void *)fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
178 dev_of_offset(parent), node, "reg", 1, NULL, false);
179 if (priv->base == (void *)FDT_ADDR_T_NONE ||
180 host->ioaddr == (void *)FDT_ADDR_T_NONE)
186 static int msm_sdc_bind(struct udevice *dev)
188 struct msm_sdhc_plat *plat = dev_get_platdata(dev);
190 return sdhci_bind(dev, &plat->mmc, &plat->cfg);
193 static const struct udevice_id msm_mmc_ids[] = {
194 { .compatible = "qcom,sdhci-msm-v4" },
198 U_BOOT_DRIVER(msm_sdc_drv) = {
201 .of_match = msm_mmc_ids,
202 .ofdata_to_platdata = msm_ofdata_to_platdata,
204 .bind = msm_sdc_bind,
205 .probe = msm_sdc_probe,
206 .remove = msm_sdc_remove,
207 .priv_auto_alloc_size = sizeof(struct msm_sdhc),
208 .platdata_auto_alloc_size = sizeof(struct msm_sdhc_plat),