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
25struct snps_dwmci_plat {
26	struct mmc_config	cfg;
27	struct mmc		mmc;
28};
29
30struct snps_dwmci_priv_data {
31	struct dwmci_host	host;
32	u32			f_max;
33};
34
35static 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;
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_ciu_dis;
64
65	return 0;
66
67clk_err_ciu_dis:
68	clk_disable(&clk_ciu);
69clk_err:
70	dev_err(dev, "failed to setup clocks, ret %d\n", ret);
71
72	return ret;
73}
74
75static int snps_dwmmc_of_to_plat(struct udevice *dev)
76{
77	struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
78	struct dwmci_host *host = &priv->host;
79	u32 fifo_depth;
80	int ret;
81
82	host->ioaddr = dev_read_addr_ptr(dev);
83
84	/*
85	 * If fifo-depth is unset don't set fifoth_val - we will try to
86	 * auto detect it.
87	 */
88	ret = dev_read_u32(dev, "fifo-depth", &fifo_depth);
89	if (!ret) {
90		if (fifo_depth < FIFO_MIN || fifo_depth > FIFO_MAX)
91			return -EINVAL;
92
93		host->fifoth_val = MSIZE(0x2) |
94				   RX_WMARK(fifo_depth / 2 - 1) |
95				   TX_WMARK(fifo_depth / 2);
96	}
97
98	host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
99	if (host->buswidth != 1 && host->buswidth != 4 && host->buswidth != 8)
100		return -EINVAL;
101
102	/*
103	 * If max-frequency is unset don't set priv->f_max - we will use
104	 * host->bus_hz in probe() instead.
105	 */
106	ret = dev_read_u32(dev, "max-frequency", &priv->f_max);
107	if (!ret && priv->f_max < CLOCK_MIN)
108		return -EINVAL;
109
110	host->fifo_mode = dev_read_bool(dev, "fifo-mode");
111	host->name = dev->name;
112	host->dev_index = 0;
113	host->priv = priv;
114
115	return 0;
116}
117
118int snps_dwmmc_getcd(struct udevice *dev)
119{
120	struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
121	struct dwmci_host *host = &priv->host;
122
123	return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
124}
125
126struct dm_mmc_ops snps_dwmci_dm_ops;
127
128static int snps_dwmmc_probe(struct udevice *dev)
129{
130#ifdef CONFIG_BLK
131	struct snps_dwmci_plat *plat = dev_get_plat(dev);
132#endif
133	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
134	struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
135	struct dwmci_host *host = &priv->host;
136	unsigned int clock_max;
137	int ret;
138
139	/* Extend generic 'dm_dwmci_ops' with our 'getcd' implementation */
140	memcpy(&snps_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
141	snps_dwmci_dm_ops.get_cd = snps_dwmmc_getcd;
142
143	ret = snps_dwmmc_clk_setup(dev);
144	if (ret)
145		return ret;
146
147	if (!priv->f_max)
148		clock_max = host->bus_hz;
149	else
150		clock_max = min_t(unsigned int, host->bus_hz, priv->f_max);
151
152#ifdef CONFIG_BLK
153	dwmci_setup_cfg(&plat->cfg, host, clock_max, CLOCK_MIN);
154	host->mmc = &plat->mmc;
155#else
156	ret = add_dwmci(host, clock_max, CLOCK_MIN);
157	if (ret)
158		return ret;
159#endif
160	host->mmc->priv = &priv->host;
161	upriv->mmc = host->mmc;
162	host->mmc->dev = dev;
163
164	return dwmci_probe(dev);
165}
166
167static int snps_dwmmc_bind(struct udevice *dev)
168{
169#ifdef CONFIG_BLK
170	struct snps_dwmci_plat *plat = dev_get_plat(dev);
171	int ret;
172
173	ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
174	if (ret)
175		return ret;
176#endif
177
178	return 0;
179}
180
181static const struct udevice_id snps_dwmmc_ids[] = {
182	{ .compatible = "snps,dw-mshc" },
183	{ }
184};
185
186U_BOOT_DRIVER(snps_dwmmc_drv) = {
187	.name				= "snps_dw_mmc",
188	.id				= UCLASS_MMC,
189	.of_match			= snps_dwmmc_ids,
190	.of_to_plat		= snps_dwmmc_of_to_plat,
191	.ops				= &snps_dwmci_dm_ops,
192	.bind				= snps_dwmmc_bind,
193	.probe				= snps_dwmmc_probe,
194	.priv_auto		= sizeof(struct snps_dwmci_priv_data),
195	.plat_auto	= sizeof(struct snps_dwmci_plat),
196};
197