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 <Eugeniy.Paltsev@synopsys.com>
8 */
9
10 #include <common.h>
11 #include <clk.h>
12 #include <dm.h>
13 #include <dwmmc.h>
14 #include <errno.h>
15 #include <fdtdec.h>
16 #include <dm/device_compat.h>
17 #include <linux/libfdt.h>
18 #include <linux/err.h>
19 #include <malloc.h>
20
21 #define CLOCK_MIN 400000 /* 400 kHz */
22 #define FIFO_MIN 8
23 #define FIFO_MAX 4096
24
25 struct snps_dwmci_plat {
26 struct mmc_config cfg;
27 struct mmc mmc;
28 };
29
30 struct snps_dwmci_priv_data {
31 struct dwmci_host host;
32 u32 f_max;
33 };
34
snps_dwmmc_clk_setup(struct udevice * dev)35 static int snps_dwmmc_clk_setup(struct udevice *dev)
36 {
37 struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
38 struct dwmci_host *host = &priv->host;
39
40 struct clk clk_ciu, clk_biu;
41 int ret;
42
43 ret = clk_get_by_name(dev, "ciu", &clk_ciu);
44 if (ret)
45 goto clk_err;
46
47 ret = clk_enable(&clk_ciu);
48 if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
49 goto clk_err_ciu;
50
51 host->bus_hz = clk_get_rate(&clk_ciu);
52 if (host->bus_hz < CLOCK_MIN) {
53 ret = -EINVAL;
54 goto clk_err_ciu_dis;
55 }
56
57 ret = clk_get_by_name(dev, "biu", &clk_biu);
58 if (ret)
59 goto clk_err_ciu_dis;
60
61 ret = clk_enable(&clk_biu);
62 if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
63 goto clk_err_biu;
64
65 return 0;
66
67 clk_err_biu:
68 clk_free(&clk_biu);
69 clk_err_ciu_dis:
70 clk_disable(&clk_ciu);
71 clk_err_ciu:
72 clk_free(&clk_ciu);
73 clk_err:
74 dev_err(dev, "failed to setup clocks, ret %d\n", ret);
75
76 return ret;
77 }
78
snps_dwmmc_of_to_plat(struct udevice * dev)79 static int snps_dwmmc_of_to_plat(struct udevice *dev)
80 {
81 struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
82 struct dwmci_host *host = &priv->host;
83 u32 fifo_depth;
84 int ret;
85
86 host->ioaddr = dev_read_addr_ptr(dev);
87
88 /*
89 * If fifo-depth is unset don't set fifoth_val - we will try to
90 * auto detect it.
91 */
92 ret = dev_read_u32(dev, "fifo-depth", &fifo_depth);
93 if (!ret) {
94 if (fifo_depth < FIFO_MIN || fifo_depth > FIFO_MAX)
95 return -EINVAL;
96
97 host->fifoth_val = MSIZE(0x2) |
98 RX_WMARK(fifo_depth / 2 - 1) |
99 TX_WMARK(fifo_depth / 2);
100 }
101
102 host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
103 if (host->buswidth != 1 && host->buswidth != 4 && host->buswidth != 8)
104 return -EINVAL;
105
106 /*
107 * If max-frequency is unset don't set priv->f_max - we will use
108 * host->bus_hz in probe() instead.
109 */
110 ret = dev_read_u32(dev, "max-frequency", &priv->f_max);
111 if (!ret && priv->f_max < CLOCK_MIN)
112 return -EINVAL;
113
114 host->fifo_mode = dev_read_bool(dev, "fifo-mode");
115 host->name = dev->name;
116 host->dev_index = 0;
117 host->priv = priv;
118
119 return 0;
120 }
121
snps_dwmmc_getcd(struct udevice * dev)122 int snps_dwmmc_getcd(struct udevice *dev)
123 {
124 struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
125 struct dwmci_host *host = &priv->host;
126
127 return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
128 }
129
130 struct dm_mmc_ops snps_dwmci_dm_ops;
131
snps_dwmmc_probe(struct udevice * dev)132 static int snps_dwmmc_probe(struct udevice *dev)
133 {
134 #ifdef CONFIG_BLK
135 struct snps_dwmci_plat *plat = dev_get_plat(dev);
136 #endif
137 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
138 struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
139 struct dwmci_host *host = &priv->host;
140 unsigned int clock_max;
141 int ret;
142
143 /* Extend generic 'dm_dwmci_ops' with our 'getcd' implementation */
144 memcpy(&snps_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
145 snps_dwmci_dm_ops.get_cd = snps_dwmmc_getcd;
146
147 ret = snps_dwmmc_clk_setup(dev);
148 if (ret)
149 return ret;
150
151 if (!priv->f_max)
152 clock_max = host->bus_hz;
153 else
154 clock_max = min_t(unsigned int, host->bus_hz, priv->f_max);
155
156 #ifdef CONFIG_BLK
157 dwmci_setup_cfg(&plat->cfg, host, clock_max, CLOCK_MIN);
158 host->mmc = &plat->mmc;
159 #else
160 ret = add_dwmci(host, clock_max, CLOCK_MIN);
161 if (ret)
162 return ret;
163 #endif
164 host->mmc->priv = &priv->host;
165 upriv->mmc = host->mmc;
166 host->mmc->dev = dev;
167
168 return dwmci_probe(dev);
169 }
170
snps_dwmmc_bind(struct udevice * dev)171 static int snps_dwmmc_bind(struct udevice *dev)
172 {
173 #ifdef CONFIG_BLK
174 struct snps_dwmci_plat *plat = dev_get_plat(dev);
175 int ret;
176
177 ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
178 if (ret)
179 return ret;
180 #endif
181
182 return 0;
183 }
184
185 static const struct udevice_id snps_dwmmc_ids[] = {
186 { .compatible = "snps,dw-mshc" },
187 { }
188 };
189
190 U_BOOT_DRIVER(snps_dwmmc_drv) = {
191 .name = "snps_dw_mmc",
192 .id = UCLASS_MMC,
193 .of_match = snps_dwmmc_ids,
194 .of_to_plat = snps_dwmmc_of_to_plat,
195 .ops = &snps_dwmci_dm_ops,
196 .bind = snps_dwmmc_bind,
197 .probe = snps_dwmmc_probe,
198 .priv_auto = sizeof(struct snps_dwmci_priv_data),
199 .plat_auto = sizeof(struct snps_dwmci_plat),
200 };
201