Merge tag 'mips-pull-2020-06-29' of https://gitlab.denx.de/u-boot/custodians/u-boot...
[platform/kernel/u-boot.git] / drivers / mmc / socfpga_dw_mmc.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2013 Altera Corporation <www.altera.com>
4  */
5
6 #include <common.h>
7 #include <log.h>
8 #include <asm/arch/clock_manager.h>
9 #include <asm/arch/system_manager.h>
10 #include <clk.h>
11 #include <dm.h>
12 #include <dwmmc.h>
13 #include <errno.h>
14 #include <fdtdec.h>
15 #include <dm/device_compat.h>
16 #include <linux/libfdt.h>
17 #include <linux/err.h>
18 #include <malloc.h>
19 #include <reset.h>
20
21 DECLARE_GLOBAL_DATA_PTR;
22
23 struct socfpga_dwmci_plat {
24         struct mmc_config cfg;
25         struct mmc mmc;
26 };
27
28 /* socfpga implmentation specific driver private data */
29 struct dwmci_socfpga_priv_data {
30         struct dwmci_host       host;
31         unsigned int            drvsel;
32         unsigned int            smplsel;
33 };
34
35 static void socfpga_dwmci_reset(struct udevice *dev)
36 {
37         struct reset_ctl_bulk reset_bulk;
38         int ret;
39
40         ret = reset_get_bulk(dev, &reset_bulk);
41         if (ret) {
42                 dev_warn(dev, "Can't get reset: %d\n", ret);
43                 return;
44         }
45
46         reset_deassert_bulk(&reset_bulk);
47 }
48
49 static void socfpga_dwmci_clksel(struct dwmci_host *host)
50 {
51         struct dwmci_socfpga_priv_data *priv = host->priv;
52         u32 sdmmc_mask = ((priv->smplsel & 0x7) << SYSMGR_SDMMC_SMPLSEL_SHIFT) |
53                          ((priv->drvsel & 0x7) << SYSMGR_SDMMC_DRVSEL_SHIFT);
54
55         /* Disable SDMMC clock. */
56         clrbits_le32(socfpga_get_clkmgr_addr() + CLKMGR_PERPLL_EN,
57                      CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
58
59         debug("%s: drvsel %d smplsel %d\n", __func__,
60               priv->drvsel, priv->smplsel);
61         writel(sdmmc_mask, socfpga_get_sysmgr_addr() + SYSMGR_SDMMC);
62
63         debug("%s: SYSMGR_SDMMCGRP_CTRL_REG = 0x%x\n", __func__,
64                 readl(socfpga_get_sysmgr_addr() + SYSMGR_SDMMC));
65
66         /* Enable SDMMC clock */
67         setbits_le32(socfpga_get_clkmgr_addr() + CLKMGR_PERPLL_EN,
68                      CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
69 }
70
71 static int socfpga_dwmmc_get_clk_rate(struct udevice *dev)
72 {
73         struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
74         struct dwmci_host *host = &priv->host;
75 #if CONFIG_IS_ENABLED(CLK)
76         struct clk clk;
77         int ret;
78
79         ret = clk_get_by_index(dev, 1, &clk);
80         if (ret)
81                 return ret;
82
83         host->bus_hz = clk_get_rate(&clk);
84
85         clk_free(&clk);
86 #else
87         /* Fixed clock divide by 4 which due to the SDMMC wrapper */
88         host->bus_hz = cm_get_mmc_controller_clk_hz();
89 #endif
90         if (host->bus_hz == 0) {
91                 printf("DWMMC: MMC clock is zero!");
92                 return -EINVAL;
93         }
94
95         return 0;
96 }
97
98 static int socfpga_dwmmc_ofdata_to_platdata(struct udevice *dev)
99 {
100         struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
101         struct dwmci_host *host = &priv->host;
102         int fifo_depth;
103
104         fifo_depth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
105                                     "fifo-depth", 0);
106         if (fifo_depth < 0) {
107                 printf("DWMMC: Can't get FIFO depth\n");
108                 return -EINVAL;
109         }
110
111         host->name = dev->name;
112         host->ioaddr = (void *)devfdt_get_addr(dev);
113         host->buswidth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
114                                         "bus-width", 4);
115         host->clksel = socfpga_dwmci_clksel;
116
117         /*
118          * TODO(sjg@chromium.org): Remove the need for this hack.
119          * We only have one dwmmc block on gen5 SoCFPGA.
120          */
121         host->dev_index = 0;
122         host->fifoth_val = MSIZE(0x2) |
123                 RX_WMARK(fifo_depth / 2 - 1) | TX_WMARK(fifo_depth / 2);
124         priv->drvsel = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
125                                        "drvsel", 3);
126         priv->smplsel = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
127                                         "smplsel", 0);
128         host->priv = priv;
129
130         return 0;
131 }
132
133 static int socfpga_dwmmc_probe(struct udevice *dev)
134 {
135 #ifdef CONFIG_BLK
136         struct socfpga_dwmci_plat *plat = dev_get_platdata(dev);
137 #endif
138         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
139         struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
140         struct dwmci_host *host = &priv->host;
141         int ret;
142
143         ret = socfpga_dwmmc_get_clk_rate(dev);
144         if (ret)
145                 return ret;
146
147         socfpga_dwmci_reset(dev);
148
149 #ifdef CONFIG_BLK
150         dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, 400000);
151         host->mmc = &plat->mmc;
152 #else
153
154         ret = add_dwmci(host, host->bus_hz, 400000);
155         if (ret)
156                 return ret;
157 #endif
158         host->mmc->priv = &priv->host;
159         upriv->mmc = host->mmc;
160         host->mmc->dev = dev;
161
162         return dwmci_probe(dev);
163 }
164
165 static int socfpga_dwmmc_bind(struct udevice *dev)
166 {
167 #ifdef CONFIG_BLK
168         struct socfpga_dwmci_plat *plat = dev_get_platdata(dev);
169         int ret;
170
171         ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
172         if (ret)
173                 return ret;
174 #endif
175
176         return 0;
177 }
178
179 static const struct udevice_id socfpga_dwmmc_ids[] = {
180         { .compatible = "altr,socfpga-dw-mshc" },
181         { }
182 };
183
184 U_BOOT_DRIVER(socfpga_dwmmc_drv) = {
185         .name           = "socfpga_dwmmc",
186         .id             = UCLASS_MMC,
187         .of_match       = socfpga_dwmmc_ids,
188         .ofdata_to_platdata = socfpga_dwmmc_ofdata_to_platdata,
189         .ops            = &dm_dwmci_ops,
190         .bind           = socfpga_dwmmc_bind,
191         .probe          = socfpga_dwmmc_probe,
192         .priv_auto_alloc_size = sizeof(struct dwmci_socfpga_priv_data),
193         .platdata_auto_alloc_size = sizeof(struct socfpga_dwmci_plat),
194 };