1 /*
2  * Copyright (c) 2013 Google, Inc
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <clk.h>
9 #include <dm.h>
10 #include <dt-structs.h>
11 #include <dwmmc.h>
12 #include <errno.h>
13 #include <mapmem.h>
14 #include <pwrseq.h>
15 #include <syscon.h>
16 #include <asm/gpio.h>
17 #include <asm/arch/clock.h>
18 #include <asm/arch/periph.h>
19 #include <linux/err.h>
20 
21 DECLARE_GLOBAL_DATA_PTR;
22 
23 struct rockchip_mmc_plat {
24 #if CONFIG_IS_ENABLED(OF_PLATDATA)
25 	struct dtd_rockchip_rk3288_dw_mshc dtplat;
26 #endif
27 	struct mmc_config cfg;
28 	struct mmc mmc;
29 };
30 
31 struct rockchip_dwmmc_priv {
32 	struct clk clk;
33 	struct dwmci_host host;
34 	int fifo_depth;
35 	bool fifo_mode;
36 	u32 minmax[2];
37 };
38 
39 static uint rockchip_dwmmc_get_mmc_clk(struct dwmci_host *host, uint freq)
40 {
41 	struct udevice *dev = host->priv;
42 	struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
43 	int ret;
44 
45 	ret = clk_set_rate(&priv->clk, freq);
46 	if (ret < 0) {
47 		printf("%s: err=%d\n", __func__, ret);
48 		return ret;
49 	}
50 
51 	return freq;
52 }
53 
54 static int rockchip_dwmmc_ofdata_to_platdata(struct udevice *dev)
55 {
56 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
57 	struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
58 	struct dwmci_host *host = &priv->host;
59 
60 	host->name = dev->name;
61 	host->ioaddr = (void *)dev_get_addr(dev);
62 	host->buswidth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
63 					"bus-width", 4);
64 	host->get_mmc_clk = rockchip_dwmmc_get_mmc_clk;
65 	host->priv = dev;
66 
67 	/* use non-removeable as sdcard and emmc as judgement */
68 	if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev), "non-removable"))
69 		host->dev_index = 0;
70 	else
71 		host->dev_index = 1;
72 
73 	priv->fifo_depth = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
74 				    "fifo-depth", 0);
75 	if (priv->fifo_depth < 0)
76 		return -EINVAL;
77 	priv->fifo_mode = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
78 					  "fifo-mode");
79 
80 	/*
81 	 * 'clock-freq-min-max' is deprecated
82 	 * (see https://github.com/torvalds/linux/commit/b023030f10573de738bbe8df63d43acab64c9f7b)
83 	 */
84 	if (fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
85 				 "clock-freq-min-max", priv->minmax, 2)) {
86 		int val = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
87 					  "max-frequency", -EINVAL);
88 
89 		if (val < 0)
90 			return val;
91 
92 		priv->minmax[0] = 400000;  /* 400 kHz */
93 		priv->minmax[1] = val;
94 	} else {
95 		debug("%s: 'clock-freq-min-max' property was deprecated.\n",
96 		      __func__);
97 	}
98 #endif
99 	return 0;
100 }
101 
102 static int rockchip_dwmmc_probe(struct udevice *dev)
103 {
104 	struct rockchip_mmc_plat *plat = dev_get_platdata(dev);
105 	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
106 	struct rockchip_dwmmc_priv *priv = dev_get_priv(dev);
107 	struct dwmci_host *host = &priv->host;
108 	struct udevice *pwr_dev __maybe_unused;
109 	int ret;
110 
111 #if CONFIG_IS_ENABLED(OF_PLATDATA)
112 	struct dtd_rockchip_rk3288_dw_mshc *dtplat = &plat->dtplat;
113 
114 	host->name = dev->name;
115 	host->ioaddr = map_sysmem(dtplat->reg[0], dtplat->reg[1]);
116 	host->buswidth = dtplat->bus_width;
117 	host->get_mmc_clk = rockchip_dwmmc_get_mmc_clk;
118 	host->priv = dev;
119 	host->dev_index = 0;
120 	priv->fifo_depth = dtplat->fifo_depth;
121 	priv->fifo_mode = 0;
122 	memcpy(priv->minmax, dtplat->clock_freq_min_max, sizeof(priv->minmax));
123 
124 	ret = clk_get_by_index_platdata(dev, 0, dtplat->clocks, &priv->clk);
125 	if (ret < 0)
126 		return ret;
127 #else
128 	ret = clk_get_by_name(dev, "ciu", &priv->clk);
129 	if (ret < 0)
130 		return ret;
131 #endif
132 	host->fifoth_val = MSIZE(0x2) |
133 		RX_WMARK(priv->fifo_depth / 2 - 1) |
134 		TX_WMARK(priv->fifo_depth / 2);
135 
136 	host->fifo_mode = priv->fifo_mode;
137 
138 #ifdef CONFIG_PWRSEQ
139 	/* Enable power if needed */
140 	ret = uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq",
141 					   &pwr_dev);
142 	if (!ret) {
143 		ret = pwrseq_set_power(pwr_dev, true);
144 		if (ret)
145 			return ret;
146 	}
147 #endif
148 	dwmci_setup_cfg(&plat->cfg, host, priv->minmax[1], priv->minmax[0]);
149 	host->mmc = &plat->mmc;
150 	host->mmc->priv = &priv->host;
151 	host->mmc->dev = dev;
152 	upriv->mmc = host->mmc;
153 
154 	return dwmci_probe(dev);
155 }
156 
157 static int rockchip_dwmmc_bind(struct udevice *dev)
158 {
159 	struct rockchip_mmc_plat *plat = dev_get_platdata(dev);
160 
161 	return dwmci_bind(dev, &plat->mmc, &plat->cfg);
162 }
163 
164 static const struct udevice_id rockchip_dwmmc_ids[] = {
165 	{ .compatible = "rockchip,rk3288-dw-mshc" },
166 	{ }
167 };
168 
169 U_BOOT_DRIVER(rockchip_dwmmc_drv) = {
170 	.name		= "rockchip_rk3288_dw_mshc",
171 	.id		= UCLASS_MMC,
172 	.of_match	= rockchip_dwmmc_ids,
173 	.ofdata_to_platdata = rockchip_dwmmc_ofdata_to_platdata,
174 	.ops		= &dm_dwmci_ops,
175 	.bind		= rockchip_dwmmc_bind,
176 	.probe		= rockchip_dwmmc_probe,
177 	.priv_auto_alloc_size = sizeof(struct rockchip_dwmmc_priv),
178 	.platdata_auto_alloc_size = sizeof(struct rockchip_mmc_plat),
179 };
180 
181 #ifdef CONFIG_PWRSEQ
182 static int rockchip_dwmmc_pwrseq_set_power(struct udevice *dev, bool enable)
183 {
184 	struct gpio_desc reset;
185 	int ret;
186 
187 	ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT);
188 	if (ret)
189 		return ret;
190 	dm_gpio_set_value(&reset, 1);
191 	udelay(1);
192 	dm_gpio_set_value(&reset, 0);
193 	udelay(200);
194 
195 	return 0;
196 }
197 
198 static const struct pwrseq_ops rockchip_dwmmc_pwrseq_ops = {
199 	.set_power	= rockchip_dwmmc_pwrseq_set_power,
200 };
201 
202 static const struct udevice_id rockchip_dwmmc_pwrseq_ids[] = {
203 	{ .compatible = "mmc-pwrseq-emmc" },
204 	{ }
205 };
206 
207 U_BOOT_DRIVER(rockchip_dwmmc_pwrseq_drv) = {
208 	.name		= "mmc_pwrseq_emmc",
209 	.id		= UCLASS_PWRSEQ,
210 	.of_match	= rockchip_dwmmc_pwrseq_ids,
211 	.ops		= &rockchip_dwmmc_pwrseq_ops,
212 };
213 #endif
214