3 * Rob Emanuele <rob@emanuele.us>
4 * Reinhard Meyer, EMK Elektronik <reinhard.meyer@emk-elektronik.de>
7 * Copyright (C) 2004-2006 Atmel Corporation
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
33 #include <asm/errno.h>
34 #include <asm/byteorder.h>
35 #include <asm/arch/clk.h>
36 #include <asm/arch/hardware.h>
37 #include "atmel_mci.h"
39 #ifndef CONFIG_SYS_MMC_CLK_OD
40 # define CONFIG_SYS_MMC_CLK_OD 150000
43 #define MMC_DEFAULT_BLKLEN 512
45 #if defined(CONFIG_ATMEL_MCI_PORTB)
51 static int initialized = 0;
54 * Print command and status:
56 * - always when DEBUG is defined
59 static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg)
61 printf("gen_atmel_mci: CMDR %08x (%2u) ARGR %08x (SR: %08x) %s\n",
62 cmdr, cmdr&0x3F, arg, status, msg);
65 /* Setup for MCI Clock and Block Size */
66 static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
68 atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
69 u32 bus_hz = get_mci_clk_rate();
72 debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n",
75 /* find lowest clkdiv yielding a rate <= than requested */
76 for (clkdiv=0; clkdiv<255; clkdiv++) {
77 if ((bus_hz / (clkdiv+1) / 2) <= hz)
81 printf("mci: setting clock %u Hz, block size %u\n",
82 (bus_hz / (clkdiv+1)) / 2, blklen);
85 /* On some platforms RDPROOF and WRPROOF are ignored */
86 writel((MMCI_BF(CLKDIV, clkdiv)
87 | MMCI_BF(BLKLEN, blklen)
89 | MMCI_BIT(WRPROOF)), &mci->mr);
93 /* Return the CMDR with flags for a given command and data packet */
94 static u32 mci_encode_cmd(
95 struct mmc_cmd *cmd, struct mmc_data *data, u32* error_flags)
99 /* Default Flags for Errors */
100 *error_flags |= (MMCI_BIT(DTOE) | MMCI_BIT(RDIRE) | MMCI_BIT(RENDE) |
101 MMCI_BIT(RINDE) | MMCI_BIT(RTOE));
103 /* Default Flags for the Command */
104 cmdr |= MMCI_BIT(MAXLAT);
107 cmdr |= MMCI_BF(TRCMD, 1);
108 if (data->blocks > 1)
109 cmdr |= MMCI_BF(TRTYP, 1);
110 if (data->flags & MMC_DATA_READ)
111 cmdr |= MMCI_BIT(TRDIR);
114 if (cmd->resp_type & MMC_RSP_CRC)
115 *error_flags |= MMCI_BIT(RCRCE);
116 if (cmd->resp_type & MMC_RSP_136)
117 cmdr |= MMCI_BF(RSPTYP, 2);
118 else if (cmd->resp_type & MMC_RSP_BUSY)
119 cmdr |= MMCI_BF(RSPTYP, 3);
120 else if (cmd->resp_type & MMC_RSP_PRESENT)
121 cmdr |= MMCI_BF(RSPTYP, 1);
123 return cmdr | MMCI_BF(CMDNB, cmd->cmdidx);
126 /* Entered into function pointer in mci_send_cmd */
127 static u32 mci_data_read(atmel_mci_t *mci, u32* data, u32 error_flags)
132 status = readl(&mci->sr);
133 if (status & (error_flags | MMCI_BIT(OVRE)))
135 } while (!(status & MMCI_BIT(RXRDY)));
137 if (status & MMCI_BIT(RXRDY)) {
138 *data = readl(&mci->rdr);
145 /* Entered into function pointer in mci_send_cmd */
146 static u32 mci_data_write(atmel_mci_t *mci, u32* data, u32 error_flags)
151 status = readl(&mci->sr);
152 if (status & (error_flags | MMCI_BIT(UNRE)))
154 } while (!(status & MMCI_BIT(TXRDY)));
156 if (status & MMCI_BIT(TXRDY)) {
157 writel(*data, &mci->tdr);
165 * Entered into mmc structure during driver init
167 * Sends a command out on the bus and deals with the block data.
168 * Takes the mmc pointer, a command pointer, and an optional data pointer.
171 mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
173 atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
179 puts ("MCI not initialized!\n");
183 /* Figure out the transfer arguments */
184 cmdr = mci_encode_cmd(cmd, data, &error_flags);
186 /* Send the command */
187 writel(cmd->cmdarg, &mci->argr);
188 writel(cmdr, &mci->cmdr);
191 dump_cmd(cmdr, cmd->cmdarg, 0, "DEBUG");
194 /* Wait for the command to complete */
195 while (!((status = readl(&mci->sr)) & MMCI_BIT(CMDRDY)));
197 if (status & error_flags) {
198 dump_cmd(cmdr, cmd->cmdarg, status, "Command Failed");
202 /* Copy the response to the response buffer */
203 if (cmd->resp_type & MMC_RSP_136) {
204 cmd->response[0] = readl(&mci->rspr);
205 cmd->response[1] = readl(&mci->rspr1);
206 cmd->response[2] = readl(&mci->rspr2);
207 cmd->response[3] = readl(&mci->rspr3);
209 cmd->response[0] = readl(&mci->rspr);
211 /* transfer all of the blocks */
213 u32 word_count, block_count;
215 u32 sys_blocksize, dummy, i;
217 (atmel_mci_t *mci, u32* data, u32 error_flags);
219 if (data->flags & MMC_DATA_READ) {
220 mci_data_op = mci_data_read;
221 sys_blocksize = mmc->read_bl_len;
222 ioptr = (u32*)data->dest;
224 mci_data_op = mci_data_write;
225 sys_blocksize = mmc->write_bl_len;
226 ioptr = (u32*)data->src;
230 for (block_count = 0;
231 block_count < data->blocks && !status;
235 status = mci_data_op(mci, ioptr, error_flags);
238 } while (!status && word_count < (data->blocksize/4));
240 if (data->flags & MMC_DATA_READ)
242 printf("Read Data:\n");
243 print_buffer(0, data->dest, 1,
248 if (!status && word_count < (sys_blocksize / 4))
249 printf("filling rest of block...\n");
251 /* fill the rest of a full block */
252 while (!status && word_count < (sys_blocksize / 4)) {
253 status = mci_data_op(mci, &dummy,
258 dump_cmd(cmdr, cmd->cmdarg, status,
259 "Data Transfer Failed");
264 /* Wait for Transfer End */
267 status = readl(&mci->sr);
269 if (status & error_flags) {
270 dump_cmd(cmdr, cmd->cmdarg, status,
275 } while ((status & MMCI_BIT(DTIP)) && i < 10000);
276 if (status & MMCI_BIT(DTIP)) {
277 dump_cmd(cmdr, cmd->cmdarg, status,
278 "XFER DTIP never unset, ignoring");
285 /* Entered into mmc structure during driver init */
286 static void mci_set_ios(struct mmc *mmc)
288 atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
289 int busw = (mmc->bus_width == 4) ? 1 : 0;
291 /* Set the clock speed */
292 mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN);
295 * set the bus width and select slot for this interface
296 * there is no capability for multiple slots on the same interface yet
297 * Bitfield SCDBUS needs to be expanded to 2 bits for 8-bit buses
299 writel(MMCI_BF(SCDBUS, busw) | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
302 /* Entered into mmc structure during driver init */
303 static int mci_init(struct mmc *mmc)
305 atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
307 /* Initialize controller */
308 writel(MMCI_BIT(SWRST), &mci->cr); /* soft reset */
309 writel(MMCI_BIT(PWSDIS), &mci->cr); /* disable power save */
310 writel(MMCI_BIT(MCIEN), &mci->cr); /* enable mci */
311 writel(MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr); /* select port */
313 /* Initial Time-outs */
314 writel(0x5f, &mci->dtor);
315 /* Disable Interrupts */
316 writel(~0UL, &mci->idr);
318 /* Set default clocks and blocklen */
319 mci_set_mode(mmc, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
325 * This is the only exported function
327 * Call it with the MCI register base address
329 int atmel_mci_init(void *regs)
331 struct mmc *mmc = malloc(sizeof(struct mmc));
335 strcpy(mmc->name, "mci");
337 mmc->send_cmd = mci_send_cmd;
338 mmc->set_ios = mci_set_ios;
339 mmc->init = mci_init;
342 /* need to be able to pass these in on a board by board basis */
343 mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
344 mmc->host_caps = MMC_MODE_4BIT;
346 * min and max frequencies determined by
347 * max and min of clock divider
349 mmc->f_min = get_mci_clk_rate() / (2*256);
350 mmc->f_max = get_mci_clk_rate() / (2*1);