xref: /openbmc/u-boot/drivers/mmc/meson_gx_mmc.c (revision 5396b2a9)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2016 Carlo Caione <carlo@caione.org>
4  */
5 
6 #include <common.h>
7 #include <dm.h>
8 #include <fdtdec.h>
9 #include <malloc.h>
10 #include <mmc.h>
11 #include <asm/io.h>
12 #include <asm/arch/sd_emmc.h>
13 #include <linux/log2.h>
14 
15 static inline void *get_regbase(const struct mmc *mmc)
16 {
17 	struct meson_mmc_platdata *pdata = mmc->priv;
18 
19 	return pdata->regbase;
20 }
21 
22 static inline uint32_t meson_read(struct mmc *mmc, int offset)
23 {
24 	return readl(get_regbase(mmc) + offset);
25 }
26 
27 static inline void meson_write(struct mmc *mmc, uint32_t val, int offset)
28 {
29 	writel(val, get_regbase(mmc) + offset);
30 }
31 
32 static void meson_mmc_config_clock(struct mmc *mmc)
33 {
34 	uint32_t meson_mmc_clk = 0;
35 	unsigned int clk, clk_src, clk_div;
36 
37 	if (!mmc->clock)
38 		return;
39 
40 	/* 1GHz / CLK_MAX_DIV = 15,9 MHz */
41 	if (mmc->clock > 16000000) {
42 		clk = SD_EMMC_CLKSRC_DIV2;
43 		clk_src = CLK_SRC_DIV2;
44 	} else {
45 		clk = SD_EMMC_CLKSRC_24M;
46 		clk_src = CLK_SRC_24M;
47 	}
48 	clk_div = DIV_ROUND_UP(clk, mmc->clock);
49 
50 	/* 180 phase core clock */
51 	meson_mmc_clk |= CLK_CO_PHASE_180;
52 
53 	/* 180 phase tx clock */
54 	meson_mmc_clk |= CLK_TX_PHASE_000;
55 
56 	/* clock settings */
57 	meson_mmc_clk |= clk_src;
58 	meson_mmc_clk |= clk_div;
59 
60 	meson_write(mmc, meson_mmc_clk, MESON_SD_EMMC_CLOCK);
61 }
62 
63 static int meson_dm_mmc_set_ios(struct udevice *dev)
64 {
65 	struct mmc *mmc = mmc_get_mmc_dev(dev);
66 	uint32_t meson_mmc_cfg;
67 
68 	meson_mmc_config_clock(mmc);
69 
70 	meson_mmc_cfg = meson_read(mmc, MESON_SD_EMMC_CFG);
71 
72 	meson_mmc_cfg &= ~CFG_BUS_WIDTH_MASK;
73 	if (mmc->bus_width == 1)
74 		meson_mmc_cfg |= CFG_BUS_WIDTH_1;
75 	else if (mmc->bus_width == 4)
76 		meson_mmc_cfg |= CFG_BUS_WIDTH_4;
77 	else if (mmc->bus_width == 8)
78 		meson_mmc_cfg |= CFG_BUS_WIDTH_8;
79 	else
80 		return -EINVAL;
81 
82 	/* 512 bytes block length */
83 	meson_mmc_cfg &= ~CFG_BL_LEN_MASK;
84 	meson_mmc_cfg |= CFG_BL_LEN_512;
85 
86 	/* Response timeout 256 clk */
87 	meson_mmc_cfg &= ~CFG_RESP_TIMEOUT_MASK;
88 	meson_mmc_cfg |= CFG_RESP_TIMEOUT_256;
89 
90 	/* Command-command gap 16 clk */
91 	meson_mmc_cfg &= ~CFG_RC_CC_MASK;
92 	meson_mmc_cfg |= CFG_RC_CC_16;
93 
94 	meson_write(mmc, meson_mmc_cfg, MESON_SD_EMMC_CFG);
95 
96 	return 0;
97 }
98 
99 static void meson_mmc_setup_cmd(struct mmc *mmc, struct mmc_data *data,
100 				struct mmc_cmd *cmd)
101 {
102 	uint32_t meson_mmc_cmd = 0, cfg;
103 
104 	meson_mmc_cmd |= cmd->cmdidx << CMD_CFG_CMD_INDEX_SHIFT;
105 
106 	if (cmd->resp_type & MMC_RSP_PRESENT) {
107 		if (cmd->resp_type & MMC_RSP_136)
108 			meson_mmc_cmd |= CMD_CFG_RESP_128;
109 
110 		if (cmd->resp_type & MMC_RSP_BUSY)
111 			meson_mmc_cmd |= CMD_CFG_R1B;
112 
113 		if (!(cmd->resp_type & MMC_RSP_CRC))
114 			meson_mmc_cmd |= CMD_CFG_RESP_NOCRC;
115 	} else {
116 		meson_mmc_cmd |= CMD_CFG_NO_RESP;
117 	}
118 
119 	if (data) {
120 		cfg = meson_read(mmc, MESON_SD_EMMC_CFG);
121 		cfg &= ~CFG_BL_LEN_MASK;
122 		cfg |= ilog2(data->blocksize) << CFG_BL_LEN_SHIFT;
123 		meson_write(mmc, cfg, MESON_SD_EMMC_CFG);
124 
125 		if (data->flags == MMC_DATA_WRITE)
126 			meson_mmc_cmd |= CMD_CFG_DATA_WR;
127 
128 		meson_mmc_cmd |= CMD_CFG_DATA_IO | CMD_CFG_BLOCK_MODE |
129 				 data->blocks;
130 	}
131 
132 	meson_mmc_cmd |= CMD_CFG_TIMEOUT_4S | CMD_CFG_OWNER |
133 			 CMD_CFG_END_OF_CHAIN;
134 
135 	meson_write(mmc, meson_mmc_cmd, MESON_SD_EMMC_CMD_CFG);
136 }
137 
138 static void meson_mmc_setup_addr(struct mmc *mmc, struct mmc_data *data)
139 {
140 	struct meson_mmc_platdata *pdata = mmc->priv;
141 	unsigned int data_size;
142 	uint32_t data_addr = 0;
143 
144 	if (data) {
145 		data_size = data->blocks * data->blocksize;
146 
147 		if (data->flags == MMC_DATA_READ) {
148 			data_addr = (ulong) data->dest;
149 			invalidate_dcache_range(data_addr,
150 						data_addr + data_size);
151 		} else {
152 			pdata->w_buf = calloc(data_size, sizeof(char));
153 			data_addr = (ulong) pdata->w_buf;
154 			memcpy(pdata->w_buf, data->src, data_size);
155 			flush_dcache_range(data_addr, data_addr + data_size);
156 		}
157 	}
158 
159 	meson_write(mmc, data_addr, MESON_SD_EMMC_CMD_DAT);
160 }
161 
162 static void meson_mmc_read_response(struct mmc *mmc, struct mmc_cmd *cmd)
163 {
164 	if (cmd->resp_type & MMC_RSP_136) {
165 		cmd->response[0] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP3);
166 		cmd->response[1] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP2);
167 		cmd->response[2] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP1);
168 		cmd->response[3] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP);
169 	} else {
170 		cmd->response[0] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP);
171 	}
172 }
173 
174 static int meson_dm_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
175 				 struct mmc_data *data)
176 {
177 	struct mmc *mmc = mmc_get_mmc_dev(dev);
178 	struct meson_mmc_platdata *pdata = mmc->priv;
179 	uint32_t status;
180 	ulong start;
181 	int ret = 0;
182 
183 	/* max block size supported by chip is 512 byte */
184 	if (data && data->blocksize > 512)
185 		return -EINVAL;
186 
187 	meson_mmc_setup_cmd(mmc, data, cmd);
188 	meson_mmc_setup_addr(mmc, data);
189 
190 	meson_write(mmc, cmd->cmdarg, MESON_SD_EMMC_CMD_ARG);
191 
192 	/* use 10s timeout */
193 	start = get_timer(0);
194 	do {
195 		status = meson_read(mmc, MESON_SD_EMMC_STATUS);
196 	} while(!(status & STATUS_END_OF_CHAIN) && get_timer(start) < 10000);
197 
198 	if (!(status & STATUS_END_OF_CHAIN))
199 		ret = -ETIMEDOUT;
200 	else if (status & STATUS_RESP_TIMEOUT)
201 		ret = -ETIMEDOUT;
202 	else if (status & STATUS_ERR_MASK)
203 		ret = -EIO;
204 
205 	meson_mmc_read_response(mmc, cmd);
206 
207 	if (data && data->flags == MMC_DATA_WRITE)
208 		free(pdata->w_buf);
209 
210 	/* reset status bits */
211 	meson_write(mmc, STATUS_MASK, MESON_SD_EMMC_STATUS);
212 
213 	return ret;
214 }
215 
216 static const struct dm_mmc_ops meson_dm_mmc_ops = {
217 	.send_cmd = meson_dm_mmc_send_cmd,
218 	.set_ios = meson_dm_mmc_set_ios,
219 };
220 
221 static int meson_mmc_ofdata_to_platdata(struct udevice *dev)
222 {
223 	struct meson_mmc_platdata *pdata = dev_get_platdata(dev);
224 	fdt_addr_t addr;
225 
226 	addr = devfdt_get_addr(dev);
227 	if (addr == FDT_ADDR_T_NONE)
228 		return -EINVAL;
229 
230 	pdata->regbase = (void *)addr;
231 
232 	return 0;
233 }
234 
235 static int meson_mmc_probe(struct udevice *dev)
236 {
237 	struct meson_mmc_platdata *pdata = dev_get_platdata(dev);
238 	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
239 	struct mmc *mmc = &pdata->mmc;
240 	struct mmc_config *cfg = &pdata->cfg;
241 	uint32_t val;
242 
243 	cfg->voltages = MMC_VDD_33_34 | MMC_VDD_32_33 |
244 			MMC_VDD_31_32 | MMC_VDD_165_195;
245 	cfg->host_caps = MMC_MODE_8BIT | MMC_MODE_4BIT |
246 			MMC_MODE_HS_52MHz | MMC_MODE_HS;
247 	cfg->f_min = DIV_ROUND_UP(SD_EMMC_CLKSRC_24M, CLK_MAX_DIV);
248 	cfg->f_max = 100000000; /* 100 MHz */
249 	cfg->b_max = 511; /* max 512 - 1 blocks */
250 	cfg->name = dev->name;
251 
252 	mmc->priv = pdata;
253 	upriv->mmc = mmc;
254 
255 	mmc_set_clock(mmc, cfg->f_min, MMC_CLK_ENABLE);
256 
257 	/* reset all status bits */
258 	meson_write(mmc, STATUS_MASK, MESON_SD_EMMC_STATUS);
259 
260 	/* disable interrupts */
261 	meson_write(mmc, 0, MESON_SD_EMMC_IRQ_EN);
262 
263 	/* enable auto clock mode */
264 	val = meson_read(mmc, MESON_SD_EMMC_CFG);
265 	val &= ~CFG_SDCLK_ALWAYS_ON;
266 	val |= CFG_AUTO_CLK;
267 	meson_write(mmc, val, MESON_SD_EMMC_CFG);
268 
269 	return 0;
270 }
271 
272 int meson_mmc_bind(struct udevice *dev)
273 {
274 	struct meson_mmc_platdata *pdata = dev_get_platdata(dev);
275 
276 	return mmc_bind(dev, &pdata->mmc, &pdata->cfg);
277 }
278 
279 static const struct udevice_id meson_mmc_match[] = {
280 	{ .compatible = "amlogic,meson-gx-mmc" },
281 	{ .compatible = "amlogic,meson-axg-mmc" },
282 	{ /* sentinel */ }
283 };
284 
285 U_BOOT_DRIVER(meson_mmc) = {
286 	.name = "meson_gx_mmc",
287 	.id = UCLASS_MMC,
288 	.of_match = meson_mmc_match,
289 	.ops = &meson_dm_mmc_ops,
290 	.probe = meson_mmc_probe,
291 	.bind = meson_mmc_bind,
292 	.ofdata_to_platdata = meson_mmc_ofdata_to_platdata,
293 	.platdata_auto_alloc_size = sizeof(struct meson_mmc_platdata),
294 };
295