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[J-u-boot.git] / drivers / mmc / snps_dw_mmc.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Synopsys DesignWare Multimedia Card Interface driver
4  * extensions used in various Synopsys ARC devboards.
5  *
6  * Copyright (C) 2019 Synopsys
7  * Author: Eugeniy Paltsev <[email protected]>
8  */
9
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
20 #define CLOCK_MIN               400000  /*  400 kHz */
21 #define FIFO_MIN                8
22 #define FIFO_MAX                4096
23
24 struct snps_dwmci_plat {
25         struct mmc_config       cfg;
26         struct mmc              mmc;
27 };
28
29 struct snps_dwmci_priv_data {
30         struct dwmci_host       host;
31         u32                     f_max;
32 };
33
34 static int snps_dwmmc_clk_setup(struct udevice *dev)
35 {
36         struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
37         struct dwmci_host *host = &priv->host;
38
39         struct clk clk_ciu, clk_biu;
40         int ret;
41
42         ret = clk_get_by_name(dev, "ciu", &clk_ciu);
43         if (ret)
44                 goto clk_err;
45
46         ret = clk_enable(&clk_ciu);
47         if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
48                 goto clk_err;
49
50         host->bus_hz = clk_get_rate(&clk_ciu);
51         if (host->bus_hz < CLOCK_MIN) {
52                 ret = -EINVAL;
53                 goto clk_err_ciu_dis;
54         }
55
56         ret = clk_get_by_name(dev, "biu", &clk_biu);
57         if (ret)
58                 goto clk_err_ciu_dis;
59
60         ret = clk_enable(&clk_biu);
61         if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
62                 goto clk_err_ciu_dis;
63
64         return 0;
65
66 clk_err_ciu_dis:
67         clk_disable(&clk_ciu);
68 clk_err:
69         dev_err(dev, "failed to setup clocks, ret %d\n", ret);
70
71         return ret;
72 }
73
74 static int snps_dwmmc_of_to_plat(struct udevice *dev)
75 {
76         struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
77         struct dwmci_host *host = &priv->host;
78         u32 fifo_depth;
79         int ret;
80
81         host->ioaddr = dev_read_addr_ptr(dev);
82
83         /*
84          * If fifo-depth is unset don't set fifoth_val - we will try to
85          * auto detect it.
86          */
87         ret = dev_read_u32(dev, "fifo-depth", &fifo_depth);
88         if (!ret) {
89                 if (fifo_depth < FIFO_MIN || fifo_depth > FIFO_MAX)
90                         return -EINVAL;
91
92                 host->fifoth_val = MSIZE(0x2) |
93                                    RX_WMARK(fifo_depth / 2 - 1) |
94                                    TX_WMARK(fifo_depth / 2);
95         }
96
97         host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
98         if (host->buswidth != 1 && host->buswidth != 4 && host->buswidth != 8)
99                 return -EINVAL;
100
101         /*
102          * If max-frequency is unset don't set priv->f_max - we will use
103          * host->bus_hz in probe() instead.
104          */
105         ret = dev_read_u32(dev, "max-frequency", &priv->f_max);
106         if (!ret && priv->f_max < CLOCK_MIN)
107                 return -EINVAL;
108
109         host->fifo_mode = dev_read_bool(dev, "fifo-mode");
110         host->name = dev->name;
111         host->dev_index = 0;
112         host->priv = priv;
113
114         return 0;
115 }
116
117 int snps_dwmmc_getcd(struct udevice *dev)
118 {
119         struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
120         struct dwmci_host *host = &priv->host;
121
122         return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
123 }
124
125 struct dm_mmc_ops snps_dwmci_dm_ops;
126
127 static int snps_dwmmc_probe(struct udevice *dev)
128 {
129 #ifdef CONFIG_BLK
130         struct snps_dwmci_plat *plat = dev_get_plat(dev);
131 #endif
132         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
133         struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
134         struct dwmci_host *host = &priv->host;
135         unsigned int clock_max;
136         int ret;
137
138         /* Extend generic 'dm_dwmci_ops' with our 'getcd' implementation */
139         memcpy(&snps_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
140         snps_dwmci_dm_ops.get_cd = snps_dwmmc_getcd;
141
142         ret = snps_dwmmc_clk_setup(dev);
143         if (ret)
144                 return ret;
145
146         if (!priv->f_max)
147                 clock_max = host->bus_hz;
148         else
149                 clock_max = min_t(unsigned int, host->bus_hz, priv->f_max);
150
151 #ifdef CONFIG_BLK
152         dwmci_setup_cfg(&plat->cfg, host, clock_max, CLOCK_MIN);
153         host->mmc = &plat->mmc;
154 #else
155         ret = add_dwmci(host, clock_max, CLOCK_MIN);
156         if (ret)
157                 return ret;
158 #endif
159         host->mmc->priv = &priv->host;
160         upriv->mmc = host->mmc;
161         host->mmc->dev = dev;
162
163         return dwmci_probe(dev);
164 }
165
166 static int snps_dwmmc_bind(struct udevice *dev)
167 {
168 #ifdef CONFIG_BLK
169         struct snps_dwmci_plat *plat = dev_get_plat(dev);
170         int ret;
171
172         ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
173         if (ret)
174                 return ret;
175 #endif
176
177         return 0;
178 }
179
180 static const struct udevice_id snps_dwmmc_ids[] = {
181         { .compatible = "snps,dw-mshc" },
182         { }
183 };
184
185 U_BOOT_DRIVER(snps_dwmmc_drv) = {
186         .name                           = "snps_dw_mmc",
187         .id                             = UCLASS_MMC,
188         .of_match                       = snps_dwmmc_ids,
189         .of_to_plat             = snps_dwmmc_of_to_plat,
190         .ops                            = &snps_dwmci_dm_ops,
191         .bind                           = snps_dwmmc_bind,
192         .probe                          = snps_dwmmc_probe,
193         .priv_auto              = sizeof(struct snps_dwmci_priv_data),
194         .plat_auto      = sizeof(struct snps_dwmci_plat),
195 };
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