/* * Driver for Blackfin on-chip SDH controller * * Copyright (c) 2008-2009 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ #include <common.h> #include <malloc.h> #include <part.h> #include <mmc.h> #include <asm/io.h> #include <asm/errno.h> #include <asm/byteorder.h> #include <asm/blackfin.h> #include <asm/portmux.h> #include <asm/mach-common/bits/sdh.h> #include <asm/mach-common/bits/dma.h> #if defined(__ADSPBF50x__) || defined(__ADSPBF51x__) # define bfin_read_SDH_PWR_CTL bfin_read_RSI_PWR_CONTROL # define bfin_write_SDH_PWR_CTL bfin_write_RSI_PWR_CONTROL # define bfin_read_SDH_CLK_CTL bfin_read_RSI_CLK_CONTROL # define bfin_write_SDH_CLK_CTL bfin_write_RSI_CLK_CONTROL # define bfin_write_SDH_ARGUMENT bfin_write_RSI_ARGUMENT # define bfin_write_SDH_COMMAND bfin_write_RSI_COMMAND # define bfin_read_SDH_RESPONSE0 bfin_read_RSI_RESPONSE0 # define bfin_read_SDH_RESPONSE1 bfin_read_RSI_RESPONSE1 # define bfin_read_SDH_RESPONSE2 bfin_read_RSI_RESPONSE2 # define bfin_read_SDH_RESPONSE3 bfin_read_RSI_RESPONSE3 # define bfin_write_SDH_DATA_TIMER bfin_write_RSI_DATA_TIMER # define bfin_write_SDH_DATA_LGTH bfin_write_RSI_DATA_LGTH # define bfin_read_SDH_DATA_CTL bfin_read_RSI_DATA_CONTROL # define bfin_write_SDH_DATA_CTL bfin_write_RSI_DATA_CONTROL # define bfin_read_SDH_STATUS bfin_read_RSI_STATUS # define bfin_write_SDH_STATUS_CLR bfin_write_RSI_STATUSCL # define bfin_read_SDH_CFG bfin_read_RSI_CONFIG # define bfin_write_SDH_CFG bfin_write_RSI_CONFIG # define bfin_write_DMA_START_ADDR bfin_write_DMA4_START_ADDR # define bfin_write_DMA_X_COUNT bfin_write_DMA4_X_COUNT # define bfin_write_DMA_X_MODIFY bfin_write_DMA4_X_MODIFY # define bfin_write_DMA_CONFIG bfin_write_DMA4_CONFIG # define PORTMUX_PINS \ { P_RSI_DATA0, P_RSI_DATA1, P_RSI_DATA2, P_RSI_DATA3, P_RSI_CMD, P_RSI_CLK, 0 } #elif defined(__ADSPBF54x__) # define bfin_write_DMA_START_ADDR bfin_write_DMA22_START_ADDR # define bfin_write_DMA_X_COUNT bfin_write_DMA22_X_COUNT # define bfin_write_DMA_X_MODIFY bfin_write_DMA22_X_MODIFY # define bfin_write_DMA_CONFIG bfin_write_DMA22_CONFIG # define PORTMUX_PINS \ { P_SD_D0, P_SD_D1, P_SD_D2, P_SD_D3, P_SD_CLK, P_SD_CMD, 0 } #else # error no support for this proc yet #endif static int sdh_send_cmd(struct mmc *mmc, struct mmc_cmd *mmc_cmd) { unsigned int status, timeout; int cmd = mmc_cmd->cmdidx; int flags = mmc_cmd->resp_type; int arg = mmc_cmd->cmdarg; int ret; u16 sdh_cmd; sdh_cmd = cmd | CMD_E; if (flags & MMC_RSP_PRESENT) sdh_cmd |= CMD_RSP; if (flags & MMC_RSP_136) sdh_cmd |= CMD_L_RSP; bfin_write_SDH_ARGUMENT(arg); bfin_write_SDH_COMMAND(sdh_cmd); /* wait for a while */ timeout = 0; do { if (++timeout > 1000000) { status = CMD_TIME_OUT; break; } udelay(1); status = bfin_read_SDH_STATUS(); } while (!(status & (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT | CMD_CRC_FAIL))); if (flags & MMC_RSP_PRESENT) { mmc_cmd->response[0] = bfin_read_SDH_RESPONSE0(); if (flags & MMC_RSP_136) { mmc_cmd->response[1] = bfin_read_SDH_RESPONSE1(); mmc_cmd->response[2] = bfin_read_SDH_RESPONSE2(); mmc_cmd->response[3] = bfin_read_SDH_RESPONSE3(); } } if (status & CMD_TIME_OUT) ret = TIMEOUT; else if (status & CMD_CRC_FAIL && flags & MMC_RSP_CRC) ret = COMM_ERR; else ret = 0; bfin_write_SDH_STATUS_CLR(CMD_SENT_STAT | CMD_RESP_END_STAT | CMD_TIMEOUT_STAT | CMD_CRC_FAIL_STAT); return ret; } /* set data for single block transfer */ static int sdh_setup_data(struct mmc *mmc, struct mmc_data *data) { u16 data_ctl = 0; u16 dma_cfg = 0; int ret = 0; unsigned long data_size = data->blocksize * data->blocks; /* Don't support write yet. */ if (data->flags & MMC_DATA_WRITE) return UNUSABLE_ERR; data_ctl |= ((ffs(data_size) - 1) << 4); data_ctl |= DTX_DIR; bfin_write_SDH_DATA_CTL(data_ctl); dma_cfg = WDSIZE_32 | RESTART | WNR | DMAEN; bfin_write_SDH_DATA_TIMER(-1); blackfin_dcache_flush_invalidate_range(data->dest, data->dest + data_size); /* configure DMA */ bfin_write_DMA_START_ADDR(data->dest); bfin_write_DMA_X_COUNT(data_size / 4); bfin_write_DMA_X_MODIFY(4); bfin_write_DMA_CONFIG(dma_cfg); bfin_write_SDH_DATA_LGTH(data_size); /* kick off transfer */ bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E); return ret; } static int bfin_sdh_request(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data) { u32 status; int ret = 0; ret = sdh_send_cmd(mmc, cmd); if (ret) { printf("sending CMD%d failed\n", cmd->cmdidx); return ret; } if (data) { ret = sdh_setup_data(mmc, data); do { udelay(1); status = bfin_read_SDH_STATUS(); } while (!(status & (DAT_BLK_END | DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN))); if (status & DAT_TIME_OUT) { bfin_write_SDH_STATUS_CLR(DAT_TIMEOUT_STAT); ret |= TIMEOUT; } else if (status & (DAT_CRC_FAIL | RX_OVERRUN)) { bfin_write_SDH_STATUS_CLR(DAT_CRC_FAIL_STAT | RX_OVERRUN_STAT); ret |= COMM_ERR; } else bfin_write_SDH_STATUS_CLR(DAT_BLK_END_STAT | DAT_END_STAT); if (ret) { printf("tranfering data failed\n"); return ret; } } return 0; } static void sdh_set_clk(unsigned long clk) { unsigned long sys_clk; unsigned long clk_div; u16 clk_ctl = 0; clk_ctl = bfin_read_SDH_CLK_CTL(); if (clk) { /* setting SD_CLK */ sys_clk = get_sclk(); bfin_write_SDH_CLK_CTL(clk_ctl & ~CLK_E); if (sys_clk % (2 * clk) == 0) clk_div = sys_clk / (2 * clk) - 1; else clk_div = sys_clk / (2 * clk); if (clk_div > 0xff) clk_div = 0xff; clk_ctl |= (clk_div & 0xff); clk_ctl |= CLK_E; bfin_write_SDH_CLK_CTL(clk_ctl); } else bfin_write_SDH_CLK_CTL(clk_ctl & ~CLK_E); } static void bfin_sdh_set_ios(struct mmc *mmc) { u16 cfg = 0; u16 clk_ctl = 0; if (mmc->bus_width == 4) { cfg = bfin_read_SDH_CFG(); cfg &= ~0x80; cfg |= 0x40; bfin_write_SDH_CFG(cfg); clk_ctl |= WIDE_BUS; } bfin_write_SDH_CLK_CTL(clk_ctl); sdh_set_clk(mmc->clock); } static int bfin_sdh_init(struct mmc *mmc) { const unsigned short pins[] = PORTMUX_PINS; u16 pwr_ctl = 0; /* Initialize sdh controller */ peripheral_request_list(pins, "bfin_sdh"); #if defined(__ADSPBF54x__) bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1); #endif bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN); /* Disable card detect pin */ bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | 0x60); pwr_ctl |= ROD_CTL; pwr_ctl |= PWR_ON; bfin_write_SDH_PWR_CTL(pwr_ctl); return 0; } int bfin_mmc_init(bd_t *bis) { struct mmc *mmc = NULL; mmc = malloc(sizeof(struct mmc)); if (!mmc) return -ENOMEM; sprintf(mmc->name, "Blackfin SDH"); mmc->send_cmd = bfin_sdh_request; mmc->set_ios = bfin_sdh_set_ios; mmc->init = bfin_sdh_init; mmc->getcd = NULL; mmc->host_caps = MMC_MODE_4BIT; mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34; mmc->f_max = get_sclk(); mmc->f_min = mmc->f_max >> 9; mmc->b_max = 0; mmc_register(mmc); return 0; }