2 * (C) Copyright 2007-2011
3 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
4 * Aaron <leafy.myeh@allwinnertech.com>
6 * MMC driver for allwinner sunxi platform.
8 * SPDX-License-Identifier: GPL-2.0+
15 #include <asm/arch/clock.h>
16 #include <asm/arch/cpu.h>
17 #include <asm/arch/gpio.h>
18 #include <asm/arch/mmc.h>
19 #include <asm-generic/gpio.h>
21 struct sunxi_mmc_host {
25 struct sunxi_mmc *reg;
26 struct mmc_config cfg;
29 /* support 4 mmc hosts */
30 struct sunxi_mmc_host mmc_host[4];
32 static int sunxi_mmc_getcd_gpio(int sdc_no)
35 case 0: return sunxi_name_to_gpio(CONFIG_MMC0_CD_PIN);
36 case 1: return sunxi_name_to_gpio(CONFIG_MMC1_CD_PIN);
37 case 2: return sunxi_name_to_gpio(CONFIG_MMC2_CD_PIN);
38 case 3: return sunxi_name_to_gpio(CONFIG_MMC3_CD_PIN);
43 static int mmc_resource_init(int sdc_no)
45 struct sunxi_mmc_host *mmchost = &mmc_host[sdc_no];
46 struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
49 debug("init mmc %d resource\n", sdc_no);
53 mmchost->reg = (struct sunxi_mmc *)SUNXI_MMC0_BASE;
54 mmchost->mclkreg = &ccm->sd0_clk_cfg;
57 mmchost->reg = (struct sunxi_mmc *)SUNXI_MMC1_BASE;
58 mmchost->mclkreg = &ccm->sd1_clk_cfg;
61 mmchost->reg = (struct sunxi_mmc *)SUNXI_MMC2_BASE;
62 mmchost->mclkreg = &ccm->sd2_clk_cfg;
65 mmchost->reg = (struct sunxi_mmc *)SUNXI_MMC3_BASE;
66 mmchost->mclkreg = &ccm->sd3_clk_cfg;
69 printf("Wrong mmc number %d\n", sdc_no);
72 mmchost->mmc_no = sdc_no;
74 cd_pin = sunxi_mmc_getcd_gpio(sdc_no);
76 ret = gpio_request(cd_pin, "mmc_cd");
81 static int mmc_set_mod_clk(struct sunxi_mmc_host *mmchost, unsigned int hz)
83 unsigned int pll, pll_hz, div, n, oclk_dly, sclk_dly;
86 pll = CCM_MMC_CTRL_OSCM24;
89 pll = CCM_MMC_CTRL_PLL6;
90 pll_hz = clock_get_pll6();
104 printf("mmc %u error cannot set clock to %u\n",
105 mmchost->mmc_no, hz);
109 /* determine delays */
113 } else if (hz <= 25000000) {
116 } else if (hz <= 50000000) {
125 writel(CCM_MMC_CTRL_ENABLE | pll | CCM_MMC_CTRL_SCLK_DLY(sclk_dly) |
126 CCM_MMC_CTRL_N(n) | CCM_MMC_CTRL_OCLK_DLY(oclk_dly) |
127 CCM_MMC_CTRL_M(div), mmchost->mclkreg);
129 debug("mmc %u set mod-clk req %u parent %u n %u m %u rate %u\n",
130 mmchost->mmc_no, hz, pll_hz, 1u << n, div,
131 pll_hz / (1u << n) / div);
136 static int mmc_clk_io_on(int sdc_no)
138 struct sunxi_mmc_host *mmchost = &mmc_host[sdc_no];
139 struct sunxi_ccm_reg *ccm = (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
141 debug("init mmc %d clock and io\n", sdc_no);
143 /* config ahb clock */
144 setbits_le32(&ccm->ahb_gate0, 1 << AHB_GATE_OFFSET_MMC(sdc_no));
146 #if defined(CONFIG_MACH_SUN6I) || defined(CONFIG_MACH_SUN8I)
148 setbits_le32(&ccm->ahb_reset0_cfg, 1 << AHB_RESET_OFFSET_MMC(sdc_no));
151 return mmc_set_mod_clk(mmchost, 24000000);
154 static int mmc_update_clk(struct mmc *mmc)
156 struct sunxi_mmc_host *mmchost = mmc->priv;
158 unsigned timeout_msecs = 2000;
160 cmd = SUNXI_MMC_CMD_START |
161 SUNXI_MMC_CMD_UPCLK_ONLY |
162 SUNXI_MMC_CMD_WAIT_PRE_OVER;
163 writel(cmd, &mmchost->reg->cmd);
164 while (readl(&mmchost->reg->cmd) & SUNXI_MMC_CMD_START) {
165 if (!timeout_msecs--)
170 /* clock update sets various irq status bits, clear these */
171 writel(readl(&mmchost->reg->rint), &mmchost->reg->rint);
176 static int mmc_config_clock(struct mmc *mmc)
178 struct sunxi_mmc_host *mmchost = mmc->priv;
179 unsigned rval = readl(&mmchost->reg->clkcr);
182 rval &= ~SUNXI_MMC_CLK_ENABLE;
183 writel(rval, &mmchost->reg->clkcr);
184 if (mmc_update_clk(mmc))
187 /* Set mod_clk to new rate */
188 if (mmc_set_mod_clk(mmchost, mmc->clock))
191 /* Clear internal divider */
192 rval &= ~SUNXI_MMC_CLK_DIVIDER_MASK;
193 writel(rval, &mmchost->reg->clkcr);
195 /* Re-enable Clock */
196 rval |= SUNXI_MMC_CLK_ENABLE;
197 writel(rval, &mmchost->reg->clkcr);
198 if (mmc_update_clk(mmc))
204 static void mmc_set_ios(struct mmc *mmc)
206 struct sunxi_mmc_host *mmchost = mmc->priv;
208 debug("set ios: bus_width: %x, clock: %d\n",
209 mmc->bus_width, mmc->clock);
211 /* Change clock first */
212 if (mmc->clock && mmc_config_clock(mmc) != 0) {
213 mmchost->fatal_err = 1;
217 /* Change bus width */
218 if (mmc->bus_width == 8)
219 writel(0x2, &mmchost->reg->width);
220 else if (mmc->bus_width == 4)
221 writel(0x1, &mmchost->reg->width);
223 writel(0x0, &mmchost->reg->width);
226 static int mmc_core_init(struct mmc *mmc)
228 struct sunxi_mmc_host *mmchost = mmc->priv;
230 /* Reset controller */
231 writel(SUNXI_MMC_GCTRL_RESET, &mmchost->reg->gctrl);
237 static int mmc_trans_data_by_cpu(struct mmc *mmc, struct mmc_data *data)
239 struct sunxi_mmc_host *mmchost = mmc->priv;
240 const int reading = !!(data->flags & MMC_DATA_READ);
241 const uint32_t status_bit = reading ? SUNXI_MMC_STATUS_FIFO_EMPTY :
242 SUNXI_MMC_STATUS_FIFO_FULL;
244 unsigned byte_cnt = data->blocksize * data->blocks;
245 unsigned timeout_msecs = 2000;
246 unsigned *buff = (unsigned int *)(reading ? data->dest : data->src);
248 /* Always read / write data through the CPU */
249 setbits_le32(&mmchost->reg->gctrl, SUNXI_MMC_GCTRL_ACCESS_BY_AHB);
251 for (i = 0; i < (byte_cnt >> 2); i++) {
252 while (readl(&mmchost->reg->status) & status_bit) {
253 if (!timeout_msecs--)
259 buff[i] = readl(&mmchost->reg->fifo);
261 writel(buff[i], &mmchost->reg->fifo);
267 static int mmc_rint_wait(struct mmc *mmc, unsigned int timeout_msecs,
268 unsigned int done_bit, const char *what)
270 struct sunxi_mmc_host *mmchost = mmc->priv;
274 status = readl(&mmchost->reg->rint);
275 if (!timeout_msecs-- ||
276 (status & SUNXI_MMC_RINT_INTERRUPT_ERROR_BIT)) {
277 debug("%s timeout %x\n", what,
278 status & SUNXI_MMC_RINT_INTERRUPT_ERROR_BIT);
282 } while (!(status & done_bit));
287 static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
288 struct mmc_data *data)
290 struct sunxi_mmc_host *mmchost = mmc->priv;
291 unsigned int cmdval = SUNXI_MMC_CMD_START;
292 unsigned int timeout_msecs;
294 unsigned int status = 0;
295 unsigned int bytecnt = 0;
297 if (mmchost->fatal_err)
299 if (cmd->resp_type & MMC_RSP_BUSY)
300 debug("mmc cmd %d check rsp busy\n", cmd->cmdidx);
301 if (cmd->cmdidx == 12)
305 cmdval |= SUNXI_MMC_CMD_SEND_INIT_SEQ;
306 if (cmd->resp_type & MMC_RSP_PRESENT)
307 cmdval |= SUNXI_MMC_CMD_RESP_EXPIRE;
308 if (cmd->resp_type & MMC_RSP_136)
309 cmdval |= SUNXI_MMC_CMD_LONG_RESPONSE;
310 if (cmd->resp_type & MMC_RSP_CRC)
311 cmdval |= SUNXI_MMC_CMD_CHK_RESPONSE_CRC;
314 if ((u32) data->dest & 0x3) {
319 cmdval |= SUNXI_MMC_CMD_DATA_EXPIRE|SUNXI_MMC_CMD_WAIT_PRE_OVER;
320 if (data->flags & MMC_DATA_WRITE)
321 cmdval |= SUNXI_MMC_CMD_WRITE;
322 if (data->blocks > 1)
323 cmdval |= SUNXI_MMC_CMD_AUTO_STOP;
324 writel(data->blocksize, &mmchost->reg->blksz);
325 writel(data->blocks * data->blocksize, &mmchost->reg->bytecnt);
328 debug("mmc %d, cmd %d(0x%08x), arg 0x%08x\n", mmchost->mmc_no,
329 cmd->cmdidx, cmdval | cmd->cmdidx, cmd->cmdarg);
330 writel(cmd->cmdarg, &mmchost->reg->arg);
333 writel(cmdval | cmd->cmdidx, &mmchost->reg->cmd);
336 * transfer data and check status
337 * STATREG[2] : FIFO empty
338 * STATREG[3] : FIFO full
343 bytecnt = data->blocksize * data->blocks;
344 debug("trans data %d bytes\n", bytecnt);
345 writel(cmdval | cmd->cmdidx, &mmchost->reg->cmd);
346 ret = mmc_trans_data_by_cpu(mmc, data);
348 error = readl(&mmchost->reg->rint) & \
349 SUNXI_MMC_RINT_INTERRUPT_ERROR_BIT;
355 error = mmc_rint_wait(mmc, 0xfffff, SUNXI_MMC_RINT_COMMAND_DONE, "cmd");
361 debug("cacl timeout %x msec\n", timeout_msecs);
362 error = mmc_rint_wait(mmc, timeout_msecs,
364 SUNXI_MMC_RINT_AUTO_COMMAND_DONE :
365 SUNXI_MMC_RINT_DATA_OVER,
371 if (cmd->resp_type & MMC_RSP_BUSY) {
372 timeout_msecs = 2000;
374 status = readl(&mmchost->reg->status);
375 if (!timeout_msecs--) {
376 debug("busy timeout\n");
381 } while (status & SUNXI_MMC_STATUS_CARD_DATA_BUSY);
384 if (cmd->resp_type & MMC_RSP_136) {
385 cmd->response[0] = readl(&mmchost->reg->resp3);
386 cmd->response[1] = readl(&mmchost->reg->resp2);
387 cmd->response[2] = readl(&mmchost->reg->resp1);
388 cmd->response[3] = readl(&mmchost->reg->resp0);
389 debug("mmc resp 0x%08x 0x%08x 0x%08x 0x%08x\n",
390 cmd->response[3], cmd->response[2],
391 cmd->response[1], cmd->response[0]);
393 cmd->response[0] = readl(&mmchost->reg->resp0);
394 debug("mmc resp 0x%08x\n", cmd->response[0]);
398 writel(SUNXI_MMC_GCTRL_RESET, &mmchost->reg->gctrl);
401 writel(0xffffffff, &mmchost->reg->rint);
402 writel(readl(&mmchost->reg->gctrl) | SUNXI_MMC_GCTRL_FIFO_RESET,
403 &mmchost->reg->gctrl);
408 static int sunxi_mmc_getcd(struct mmc *mmc)
410 struct sunxi_mmc_host *mmchost = mmc->priv;
413 cd_pin = sunxi_mmc_getcd_gpio(mmchost->mmc_no);
417 return !gpio_direction_input(cd_pin);
420 static const struct mmc_ops sunxi_mmc_ops = {
421 .send_cmd = mmc_send_cmd,
422 .set_ios = mmc_set_ios,
423 .init = mmc_core_init,
424 .getcd = sunxi_mmc_getcd,
427 struct mmc *sunxi_mmc_init(int sdc_no)
429 struct mmc_config *cfg = &mmc_host[sdc_no].cfg;
431 memset(&mmc_host[sdc_no], 0, sizeof(struct sunxi_mmc_host));
433 cfg->name = "SUNXI SD/MMC";
434 cfg->ops = &sunxi_mmc_ops;
436 cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
437 cfg->host_caps = MMC_MODE_4BIT;
438 cfg->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
439 #if defined(CONFIG_MACH_SUN6I) || defined(CONFIG_MACH_SUN7I) || defined(CONFIG_MACH_SUN8I)
440 cfg->host_caps |= MMC_MODE_HC;
442 cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
445 cfg->f_max = 52000000;
447 if (mmc_resource_init(sdc_no) != 0)
450 mmc_clk_io_on(sdc_no);
452 return mmc_create(cfg, &mmc_host[sdc_no]);