1 /*
2 * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8 #include <errno.h>
9 #include <string.h>
10
11 #include <arch.h>
12 #include <arch_helpers.h>
13 #include <common/debug.h>
14 #include <drivers/delay_timer.h>
15 #include <drivers/mmc.h>
16 #include <lib/mmio.h>
17
18 #include <imx_usdhc.h>
19
20 static void imx_usdhc_initialize(void);
21 static int imx_usdhc_send_cmd(struct mmc_cmd *cmd);
22 static int imx_usdhc_set_ios(unsigned int clk, unsigned int width);
23 static int imx_usdhc_prepare(int lba, uintptr_t buf, size_t size);
24 static int imx_usdhc_read(int lba, uintptr_t buf, size_t size);
25 static int imx_usdhc_write(int lba, uintptr_t buf, size_t size);
26
27 static const struct mmc_ops imx_usdhc_ops = {
28 .init = imx_usdhc_initialize,
29 .send_cmd = imx_usdhc_send_cmd,
30 .set_ios = imx_usdhc_set_ios,
31 .prepare = imx_usdhc_prepare,
32 .read = imx_usdhc_read,
33 .write = imx_usdhc_write,
34 };
35
36 static imx_usdhc_params_t imx_usdhc_params;
37
38 #define IMX7_MMC_SRC_CLK_RATE (200 * 1000 * 1000)
imx_usdhc_set_clk(int clk)39 static void imx_usdhc_set_clk(int clk)
40 {
41 int div = 1;
42 int pre_div = 1;
43 unsigned int sdhc_clk = IMX7_MMC_SRC_CLK_RATE;
44 uintptr_t reg_base = imx_usdhc_params.reg_base;
45
46 assert(clk > 0);
47
48 while (sdhc_clk / (16 * pre_div) > clk && pre_div < 256)
49 pre_div *= 2;
50
51 while (sdhc_clk / div > clk && div < 16)
52 div++;
53
54 pre_div >>= 1;
55 div -= 1;
56 clk = (pre_div << 8) | (div << 4);
57
58 mmio_clrbits32(reg_base + VENDSPEC, VENDSPEC_CARD_CLKEN);
59 mmio_clrsetbits32(reg_base + SYSCTRL, SYSCTRL_CLOCK_MASK, clk);
60 udelay(10000);
61
62 mmio_setbits32(reg_base + VENDSPEC, VENDSPEC_PER_CLKEN | VENDSPEC_CARD_CLKEN);
63 }
64
imx_usdhc_initialize(void)65 static void imx_usdhc_initialize(void)
66 {
67 unsigned int timeout = 10000;
68 uintptr_t reg_base = imx_usdhc_params.reg_base;
69
70 assert((imx_usdhc_params.reg_base & MMC_BLOCK_MASK) == 0);
71
72 /* reset the controller */
73 mmio_setbits32(reg_base + SYSCTRL, SYSCTRL_RSTA);
74
75 /* wait for reset done */
76 while ((mmio_read_32(reg_base + SYSCTRL) & SYSCTRL_RSTA)) {
77 if (!timeout)
78 ERROR("IMX MMC reset timeout.\n");
79 timeout--;
80 }
81
82 mmio_write_32(reg_base + MMCBOOT, 0);
83 mmio_write_32(reg_base + MIXCTRL, 0);
84 mmio_write_32(reg_base + CLKTUNECTRLSTS, 0);
85
86 mmio_write_32(reg_base + VENDSPEC, VENDSPEC_INIT);
87 mmio_write_32(reg_base + DLLCTRL, 0);
88 mmio_setbits32(reg_base + VENDSPEC, VENDSPEC_IPG_CLKEN | VENDSPEC_PER_CLKEN);
89
90 /* Set the initial boot clock rate */
91 imx_usdhc_set_clk(MMC_BOOT_CLK_RATE);
92 udelay(100);
93
94 /* Clear read/write ready status */
95 mmio_clrbits32(reg_base + INTSTATEN, INTSTATEN_BRR | INTSTATEN_BWR);
96
97 /* configure as little endian */
98 mmio_write_32(reg_base + PROTCTRL, PROTCTRL_LE);
99
100 /* Set timeout to the maximum value */
101 mmio_clrsetbits32(reg_base + SYSCTRL, SYSCTRL_TIMEOUT_MASK,
102 SYSCTRL_TIMEOUT(15));
103
104 /* set wartermark level as 16 for safe for MMC */
105 mmio_clrsetbits32(reg_base + WATERMARKLEV, WMKLV_MASK, 16 | (16 << 16));
106 }
107
108 #define FSL_CMD_RETRIES 1000
109
imx_usdhc_send_cmd(struct mmc_cmd * cmd)110 static int imx_usdhc_send_cmd(struct mmc_cmd *cmd)
111 {
112 uintptr_t reg_base = imx_usdhc_params.reg_base;
113 unsigned int xfertype = 0, mixctl = 0, multiple = 0, data = 0, err = 0;
114 unsigned int state, flags = INTSTATEN_CC | INTSTATEN_CTOE;
115 unsigned int cmd_retries = 0;
116
117 assert(cmd);
118
119 /* clear all irq status */
120 mmio_write_32(reg_base + INTSTAT, 0xffffffff);
121
122 /* Wait for the bus to be idle */
123 do {
124 state = mmio_read_32(reg_base + PSTATE);
125 } while (state & (PSTATE_CDIHB | PSTATE_CIHB));
126
127 while (mmio_read_32(reg_base + PSTATE) & PSTATE_DLA)
128 ;
129
130 mmio_write_32(reg_base + INTSIGEN, 0);
131 udelay(1000);
132
133 switch (cmd->cmd_idx) {
134 case MMC_CMD(12):
135 xfertype |= XFERTYPE_CMDTYP_ABORT;
136 break;
137 case MMC_CMD(18):
138 multiple = 1;
139 /* fall thru for read op */
140 case MMC_CMD(17):
141 case MMC_CMD(8):
142 mixctl |= MIXCTRL_DTDSEL;
143 data = 1;
144 break;
145 case MMC_CMD(25):
146 multiple = 1;
147 /* fall thru for data op flag */
148 case MMC_CMD(24):
149 data = 1;
150 break;
151 default:
152 break;
153 }
154
155 if (multiple) {
156 mixctl |= MIXCTRL_MSBSEL;
157 mixctl |= MIXCTRL_BCEN;
158 }
159
160 if (data) {
161 xfertype |= XFERTYPE_DPSEL;
162 mixctl |= MIXCTRL_DMAEN;
163 }
164
165 if (cmd->resp_type & MMC_RSP_48 && cmd->resp_type != MMC_RESPONSE_R2)
166 xfertype |= XFERTYPE_RSPTYP_48;
167 else if (cmd->resp_type & MMC_RSP_136)
168 xfertype |= XFERTYPE_RSPTYP_136;
169 else if (cmd->resp_type & MMC_RSP_BUSY)
170 xfertype |= XFERTYPE_RSPTYP_48_BUSY;
171
172 if (cmd->resp_type & MMC_RSP_CMD_IDX)
173 xfertype |= XFERTYPE_CICEN;
174
175 if (cmd->resp_type & MMC_RSP_CRC)
176 xfertype |= XFERTYPE_CCCEN;
177
178 xfertype |= XFERTYPE_CMD(cmd->cmd_idx);
179
180 /* Send the command */
181 mmio_write_32(reg_base + CMDARG, cmd->cmd_arg);
182 mmio_clrsetbits32(reg_base + MIXCTRL, MIXCTRL_DATMASK, mixctl);
183 mmio_write_32(reg_base + XFERTYPE, xfertype);
184
185 /* Wait for the command done */
186 do {
187 state = mmio_read_32(reg_base + INTSTAT);
188 if (cmd_retries)
189 udelay(1);
190 } while ((!(state & flags)) && ++cmd_retries < FSL_CMD_RETRIES);
191
192 if ((state & (INTSTATEN_CTOE | CMD_ERR)) || cmd_retries == FSL_CMD_RETRIES) {
193 if (cmd_retries == FSL_CMD_RETRIES)
194 err = -ETIMEDOUT;
195 else
196 err = -EIO;
197 ERROR("imx_usdhc mmc cmd %d state 0x%x errno=%d\n",
198 cmd->cmd_idx, state, err);
199 goto out;
200 }
201
202 /* Copy the response to the response buffer */
203 if (cmd->resp_type & MMC_RSP_136) {
204 unsigned int cmdrsp3, cmdrsp2, cmdrsp1, cmdrsp0;
205
206 cmdrsp3 = mmio_read_32(reg_base + CMDRSP3);
207 cmdrsp2 = mmio_read_32(reg_base + CMDRSP2);
208 cmdrsp1 = mmio_read_32(reg_base + CMDRSP1);
209 cmdrsp0 = mmio_read_32(reg_base + CMDRSP0);
210 cmd->resp_data[3] = (cmdrsp3 << 8) | (cmdrsp2 >> 24);
211 cmd->resp_data[2] = (cmdrsp2 << 8) | (cmdrsp1 >> 24);
212 cmd->resp_data[1] = (cmdrsp1 << 8) | (cmdrsp0 >> 24);
213 cmd->resp_data[0] = (cmdrsp0 << 8);
214 } else {
215 cmd->resp_data[0] = mmio_read_32(reg_base + CMDRSP0);
216 }
217
218 /* Wait until all of the blocks are transferred */
219 if (data) {
220 flags = DATA_COMPLETE;
221 do {
222 state = mmio_read_32(reg_base + INTSTAT);
223
224 if (state & (INTSTATEN_DTOE | DATA_ERR)) {
225 err = -EIO;
226 ERROR("imx_usdhc mmc data state 0x%x\n", state);
227 goto out;
228 }
229 } while ((state & flags) != flags);
230 }
231
232 out:
233 /* Reset CMD and DATA on error */
234 if (err) {
235 mmio_setbits32(reg_base + SYSCTRL, SYSCTRL_RSTC);
236 while (mmio_read_32(reg_base + SYSCTRL) & SYSCTRL_RSTC)
237 ;
238
239 if (data) {
240 mmio_setbits32(reg_base + SYSCTRL, SYSCTRL_RSTD);
241 while (mmio_read_32(reg_base + SYSCTRL) & SYSCTRL_RSTD)
242 ;
243 }
244 }
245
246 /* clear all irq status */
247 mmio_write_32(reg_base + INTSTAT, 0xffffffff);
248
249 return err;
250 }
251
imx_usdhc_set_ios(unsigned int clk,unsigned int width)252 static int imx_usdhc_set_ios(unsigned int clk, unsigned int width)
253 {
254 uintptr_t reg_base = imx_usdhc_params.reg_base;
255
256 imx_usdhc_set_clk(clk);
257
258 if (width == MMC_BUS_WIDTH_4)
259 mmio_clrsetbits32(reg_base + PROTCTRL, PROTCTRL_WIDTH_MASK,
260 PROTCTRL_WIDTH_4);
261 else if (width == MMC_BUS_WIDTH_8)
262 mmio_clrsetbits32(reg_base + PROTCTRL, PROTCTRL_WIDTH_MASK,
263 PROTCTRL_WIDTH_8);
264
265 return 0;
266 }
267
imx_usdhc_prepare(int lba,uintptr_t buf,size_t size)268 static int imx_usdhc_prepare(int lba, uintptr_t buf, size_t size)
269 {
270 uintptr_t reg_base = imx_usdhc_params.reg_base;
271
272 mmio_write_32(reg_base + DSADDR, buf);
273 mmio_write_32(reg_base + BLKATT,
274 (size / MMC_BLOCK_SIZE) << 16 | MMC_BLOCK_SIZE);
275
276 return 0;
277 }
278
imx_usdhc_read(int lba,uintptr_t buf,size_t size)279 static int imx_usdhc_read(int lba, uintptr_t buf, size_t size)
280 {
281 return 0;
282 }
283
imx_usdhc_write(int lba,uintptr_t buf,size_t size)284 static int imx_usdhc_write(int lba, uintptr_t buf, size_t size)
285 {
286 return 0;
287 }
288
imx_usdhc_init(imx_usdhc_params_t * params,struct mmc_device_info * mmc_dev_info)289 void imx_usdhc_init(imx_usdhc_params_t *params,
290 struct mmc_device_info *mmc_dev_info)
291 {
292 assert((params != 0) &&
293 ((params->reg_base & MMC_BLOCK_MASK) == 0) &&
294 (params->clk_rate > 0) &&
295 ((params->bus_width == MMC_BUS_WIDTH_1) ||
296 (params->bus_width == MMC_BUS_WIDTH_4) ||
297 (params->bus_width == MMC_BUS_WIDTH_8)));
298
299 memcpy(&imx_usdhc_params, params, sizeof(imx_usdhc_params_t));
300 mmc_init(&imx_usdhc_ops, params->clk_rate, params->bus_width,
301 params->flags, mmc_dev_info);
302 }
303