| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Carlo Caione | 3511 | 98.26% | 1 | 10.00% |
| Nicholas Mc Guire | 22 | 0.62% | 1 | 10.00% |
| Johan Hovold | 16 | 0.45% | 1 | 10.00% |
| Kees Cook | 14 | 0.39% | 1 | 10.00% |
| Stephen Boyd | 3 | 0.08% | 1 | 10.00% |
| Dan Carpenter | 3 | 0.08% | 2 | 20.00% |
| Thomas Gleixner | 2 | 0.06% | 1 | 10.00% |
| Joe Perches | 1 | 0.03% | 1 | 10.00% |
| Gustavo A. R. Silva | 1 | 0.03% | 1 | 10.00% |
| Total | 3573 | 10 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * meson-mx-sdio.c - Meson6, Meson8 and Meson8b SDIO/MMC Host Controller * * Copyright (C) 2015 Endless Mobile, Inc. * Author: Carlo Caione <carlo@endlessm.com> * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com> */ #include <linux/bitfield.h> #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/platform_device.h> #include <linux/of_platform.h> #include <linux/timer.h> #include <linux/types.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h> #include <linux/mmc/sdio.h> #include <linux/mmc/slot-gpio.h> #define MESON_MX_SDIO_ARGU 0x00 #define MESON_MX_SDIO_SEND 0x04 #define MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK GENMASK(7, 0) #define MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK GENMASK(15, 8) #define MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7 BIT(16) #define MESON_MX_SDIO_SEND_RESP_HAS_DATA BIT(17) #define MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8 BIT(18) #define MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY BIT(19) #define MESON_MX_SDIO_SEND_DATA BIT(20) #define MESON_MX_SDIO_SEND_USE_INT_WINDOW BIT(21) #define MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK GENMASK(31, 24) #define MESON_MX_SDIO_CONF 0x08 #define MESON_MX_SDIO_CONF_CMD_CLK_DIV_SHIFT 0 #define MESON_MX_SDIO_CONF_CMD_CLK_DIV_WIDTH 10 #define MESON_MX_SDIO_CONF_CMD_DISABLE_CRC BIT(10) #define MESON_MX_SDIO_CONF_CMD_OUT_AT_POSITIVE_EDGE BIT(11) #define MESON_MX_SDIO_CONF_CMD_ARGUMENT_BITS_MASK GENMASK(17, 12) #define MESON_MX_SDIO_CONF_RESP_LATCH_AT_NEGATIVE_EDGE BIT(18) #define MESON_MX_SDIO_CONF_DATA_LATCH_AT_NEGATIVE_EDGE BIT(19) #define MESON_MX_SDIO_CONF_BUS_WIDTH BIT(20) #define MESON_MX_SDIO_CONF_M_ENDIAN_MASK GENMASK(22, 21) #define MESON_MX_SDIO_CONF_WRITE_NWR_MASK GENMASK(28, 23) #define MESON_MX_SDIO_CONF_WRITE_CRC_OK_STATUS_MASK GENMASK(31, 29) #define MESON_MX_SDIO_IRQS 0x0c #define MESON_MX_SDIO_IRQS_STATUS_STATE_MACHINE_MASK GENMASK(3, 0) #define MESON_MX_SDIO_IRQS_CMD_BUSY BIT(4) #define MESON_MX_SDIO_IRQS_RESP_CRC7_OK BIT(5) #define MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK BIT(6) #define MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK BIT(7) #define MESON_MX_SDIO_IRQS_IF_INT BIT(8) #define MESON_MX_SDIO_IRQS_CMD_INT BIT(9) #define MESON_MX_SDIO_IRQS_STATUS_INFO_MASK GENMASK(15, 12) #define MESON_MX_SDIO_IRQS_TIMING_OUT_INT BIT(16) #define MESON_MX_SDIO_IRQS_AMRISC_TIMING_OUT_INT_EN BIT(17) #define MESON_MX_SDIO_IRQS_ARC_TIMING_OUT_INT_EN BIT(18) #define MESON_MX_SDIO_IRQS_TIMING_OUT_COUNT_MASK GENMASK(31, 19) #define MESON_MX_SDIO_IRQC 0x10 #define MESON_MX_SDIO_IRQC_ARC_IF_INT_EN BIT(3) #define MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN BIT(4) #define MESON_MX_SDIO_IRQC_IF_CONFIG_MASK GENMASK(7, 6) #define MESON_MX_SDIO_IRQC_FORCE_DATA_CLK BIT(8) #define MESON_MX_SDIO_IRQC_FORCE_DATA_CMD BIT(9) #define MESON_MX_SDIO_IRQC_FORCE_DATA_DAT_MASK GENMASK(13, 10) #define MESON_MX_SDIO_IRQC_SOFT_RESET BIT(15) #define MESON_MX_SDIO_IRQC_FORCE_HALT BIT(30) #define MESON_MX_SDIO_IRQC_HALT_HOLE BIT(31) #define MESON_MX_SDIO_MULT 0x14 #define MESON_MX_SDIO_MULT_PORT_SEL_MASK GENMASK(1, 0) #define MESON_MX_SDIO_MULT_MEMORY_STICK_ENABLE BIT(2) #define MESON_MX_SDIO_MULT_MEMORY_STICK_SCLK_ALWAYS BIT(3) #define MESON_MX_SDIO_MULT_STREAM_ENABLE BIT(4) #define MESON_MX_SDIO_MULT_STREAM_8BITS_MODE BIT(5) #define MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX BIT(8) #define MESON_MX_SDIO_MULT_DAT0_DAT1_SWAPPED BIT(10) #define MESON_MX_SDIO_MULT_DAT1_DAT0_SWAPPED BIT(11) #define MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK GENMASK(15, 12) #define MESON_MX_SDIO_ADDR 0x18 #define MESON_MX_SDIO_EXT 0x1c #define MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK GENMASK(29, 16) #define MESON_MX_SDIO_BOUNCE_REQ_SIZE (128 * 1024) #define MESON_MX_SDIO_RESPONSE_CRC16_BITS (16 - 1) #define MESON_MX_SDIO_MAX_SLOTS 3 struct meson_mx_mmc_host { struct device *controller_dev; struct clk *parent_clk; struct clk *core_clk; struct clk_divider cfg_div; struct clk *cfg_div_clk; struct clk_fixed_factor fixed_factor; struct clk *fixed_factor_clk; void __iomem *base; int irq; spinlock_t irq_lock; struct timer_list cmd_timeout; unsigned int slot_id; struct mmc_host *mmc; struct mmc_request *mrq; struct mmc_command *cmd; int error; }; static void meson_mx_mmc_mask_bits(struct mmc_host *mmc, char reg, u32 mask, u32 val) { struct meson_mx_mmc_host *host = mmc_priv(mmc); u32 regval; regval = readl(host->base + reg); regval &= ~mask; regval |= (val & mask); writel(regval, host->base + reg); } static void meson_mx_mmc_soft_reset(struct meson_mx_mmc_host *host) { writel(MESON_MX_SDIO_IRQC_SOFT_RESET, host->base + MESON_MX_SDIO_IRQC); udelay(2); } static struct mmc_command *meson_mx_mmc_get_next_cmd(struct mmc_command *cmd) { if (cmd->opcode == MMC_SET_BLOCK_COUNT && !cmd->error) return cmd->mrq->cmd; else if (mmc_op_multi(cmd->opcode) && (!cmd->mrq->sbc || cmd->error || cmd->data->error)) return cmd->mrq->stop; else return NULL; } static void meson_mx_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd) { struct meson_mx_mmc_host *host = mmc_priv(mmc); unsigned int pack_size; unsigned long irqflags, timeout; u32 mult, send = 0, ext = 0; host->cmd = cmd; if (cmd->busy_timeout) timeout = msecs_to_jiffies(cmd->busy_timeout); else timeout = msecs_to_jiffies(1000); switch (mmc_resp_type(cmd)) { case MMC_RSP_R1: case MMC_RSP_R1B: case MMC_RSP_R3: /* 7 (CMD) + 32 (response) + 7 (CRC) -1 */ send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 45); break; case MMC_RSP_R2: /* 7 (CMD) + 120 (response) + 7 (CRC) -1 */ send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 133); send |= MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8; break; default: break; } if (!(cmd->flags & MMC_RSP_CRC)) send |= MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7; if (cmd->flags & MMC_RSP_BUSY) send |= MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY; if (cmd->data) { send |= FIELD_PREP(MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK, (cmd->data->blocks - 1)); pack_size = cmd->data->blksz * BITS_PER_BYTE; if (mmc->ios.bus_width == MMC_BUS_WIDTH_4) pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 4; else pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 1; ext |= FIELD_PREP(MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK, pack_size); if (cmd->data->flags & MMC_DATA_WRITE) send |= MESON_MX_SDIO_SEND_DATA; else send |= MESON_MX_SDIO_SEND_RESP_HAS_DATA; cmd->data->bytes_xfered = 0; } send |= FIELD_PREP(MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK, (0x40 | cmd->opcode)); spin_lock_irqsave(&host->irq_lock, irqflags); mult = readl(host->base + MESON_MX_SDIO_MULT); mult &= ~MESON_MX_SDIO_MULT_PORT_SEL_MASK; mult |= FIELD_PREP(MESON_MX_SDIO_MULT_PORT_SEL_MASK, host->slot_id); mult |= BIT(31); writel(mult, host->base + MESON_MX_SDIO_MULT); /* enable the CMD done interrupt */ meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQC, MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN, MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN); /* clear pending interrupts */ meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQS, MESON_MX_SDIO_IRQS_CMD_INT, MESON_MX_SDIO_IRQS_CMD_INT); writel(cmd->arg, host->base + MESON_MX_SDIO_ARGU); writel(ext, host->base + MESON_MX_SDIO_EXT); writel(send, host->base + MESON_MX_SDIO_SEND); spin_unlock_irqrestore(&host->irq_lock, irqflags); mod_timer(&host->cmd_timeout, jiffies + timeout); } static void meson_mx_mmc_request_done(struct meson_mx_mmc_host *host) { struct mmc_request *mrq; mrq = host->mrq; host->mrq = NULL; host->cmd = NULL; mmc_request_done(host->mmc, mrq); } static void meson_mx_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct meson_mx_mmc_host *host = mmc_priv(mmc); unsigned short vdd = ios->vdd; unsigned long clk_rate = ios->clock; switch (ios->bus_width) { case MMC_BUS_WIDTH_1: meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF, MESON_MX_SDIO_CONF_BUS_WIDTH, 0); break; case MMC_BUS_WIDTH_4: meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF, MESON_MX_SDIO_CONF_BUS_WIDTH, MESON_MX_SDIO_CONF_BUS_WIDTH); break; case MMC_BUS_WIDTH_8: default: dev_err(mmc_dev(mmc), "unsupported bus width: %d\n", ios->bus_width); host->error = -EINVAL; return; } host->error = clk_set_rate(host->cfg_div_clk, ios->clock); if (host->error) { dev_warn(mmc_dev(mmc), "failed to set MMC clock to %lu: %d\n", clk_rate, host->error); return; } mmc->actual_clock = clk_get_rate(host->cfg_div_clk); switch (ios->power_mode) { case MMC_POWER_OFF: vdd = 0; /* fall through */ case MMC_POWER_UP: if (!IS_ERR(mmc->supply.vmmc)) { host->error = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); if (host->error) return; } break; } } static int meson_mx_mmc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq) { struct mmc_data *data = mrq->data; int dma_len; struct scatterlist *sg; if (!data) return 0; sg = data->sg; if (sg->offset & 3 || sg->length & 3) { dev_err(mmc_dev(mmc), "unaligned scatterlist: offset %x length %d\n", sg->offset, sg->length); return -EINVAL; } dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len, mmc_get_dma_dir(data)); if (dma_len <= 0) { dev_err(mmc_dev(mmc), "dma_map_sg failed\n"); return -ENOMEM; } return 0; } static void meson_mx_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct meson_mx_mmc_host *host = mmc_priv(mmc); struct mmc_command *cmd = mrq->cmd; if (!host->error) host->error = meson_mx_mmc_map_dma(mmc, mrq); if (host->error) { cmd->error = host->error; mmc_request_done(mmc, mrq); return; } host->mrq = mrq; if (mrq->data) writel(sg_dma_address(mrq->data->sg), host->base + MESON_MX_SDIO_ADDR); if (mrq->sbc) meson_mx_mmc_start_cmd(mmc, mrq->sbc); else meson_mx_mmc_start_cmd(mmc, mrq->cmd); } static int meson_mx_mmc_card_busy(struct mmc_host *mmc) { struct meson_mx_mmc_host *host = mmc_priv(mmc); u32 irqc = readl(host->base + MESON_MX_SDIO_IRQC); return !!(irqc & MESON_MX_SDIO_IRQC_FORCE_DATA_DAT_MASK); } static void meson_mx_mmc_read_response(struct mmc_host *mmc, struct mmc_command *cmd) { struct meson_mx_mmc_host *host = mmc_priv(mmc); u32 mult; int i, resp[4]; mult = readl(host->base + MESON_MX_SDIO_MULT); mult |= MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX; mult &= ~MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK; mult |= FIELD_PREP(MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK, 0); writel(mult, host->base + MESON_MX_SDIO_MULT); if (cmd->flags & MMC_RSP_136) { for (i = 0; i <= 3; i++) resp[3 - i] = readl(host->base + MESON_MX_SDIO_ARGU); cmd->resp[0] = (resp[0] << 8) | ((resp[1] >> 24) & 0xff); cmd->resp[1] = (resp[1] << 8) | ((resp[2] >> 24) & 0xff); cmd->resp[2] = (resp[2] << 8) | ((resp[3] >> 24) & 0xff); cmd->resp[3] = (resp[3] << 8); } else if (cmd->flags & MMC_RSP_PRESENT) { cmd->resp[0] = readl(host->base + MESON_MX_SDIO_ARGU); } } static irqreturn_t meson_mx_mmc_process_cmd_irq(struct meson_mx_mmc_host *host, u32 irqs, u32 send) { struct mmc_command *cmd = host->cmd; /* * NOTE: even though it shouldn't happen we sometimes get command * interrupts twice (at least this is what it looks like). Ideally * we find out why this happens and warn here as soon as it occurs. */ if (!cmd) return IRQ_HANDLED; cmd->error = 0; meson_mx_mmc_read_response(host->mmc, cmd); if (cmd->data) { if (!((irqs & MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK) || (irqs & MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK))) cmd->error = -EILSEQ; } else { if (!((irqs & MESON_MX_SDIO_IRQS_RESP_CRC7_OK) || (send & MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7))) cmd->error = -EILSEQ; } return IRQ_WAKE_THREAD; } static irqreturn_t meson_mx_mmc_irq(int irq, void *data) { struct meson_mx_mmc_host *host = (void *) data; u32 irqs, send; unsigned long irqflags; irqreturn_t ret; spin_lock_irqsave(&host->irq_lock, irqflags); irqs = readl(host->base + MESON_MX_SDIO_IRQS); send = readl(host->base + MESON_MX_SDIO_SEND); if (irqs & MESON_MX_SDIO_IRQS_CMD_INT) ret = meson_mx_mmc_process_cmd_irq(host, irqs, send); else ret = IRQ_HANDLED; /* finally ACK all pending interrupts */ writel(irqs, host->base + MESON_MX_SDIO_IRQS); spin_unlock_irqrestore(&host->irq_lock, irqflags); return ret; } static irqreturn_t meson_mx_mmc_irq_thread(int irq, void *irq_data) { struct meson_mx_mmc_host *host = (void *) irq_data; struct mmc_command *cmd = host->cmd, *next_cmd; if (WARN_ON(!cmd)) return IRQ_HANDLED; del_timer_sync(&host->cmd_timeout); if (cmd->data) { dma_unmap_sg(mmc_dev(host->mmc), cmd->data->sg, cmd->data->sg_len, mmc_get_dma_dir(cmd->data)); cmd->data->bytes_xfered = cmd->data->blksz * cmd->data->blocks; } next_cmd = meson_mx_mmc_get_next_cmd(cmd); if (next_cmd) meson_mx_mmc_start_cmd(host->mmc, next_cmd); else meson_mx_mmc_request_done(host); return IRQ_HANDLED; } static void meson_mx_mmc_timeout(struct timer_list *t) { struct meson_mx_mmc_host *host = from_timer(host, t, cmd_timeout); unsigned long irqflags; u32 irqc; spin_lock_irqsave(&host->irq_lock, irqflags); /* disable the CMD interrupt */ irqc = readl(host->base + MESON_MX_SDIO_IRQC); irqc &= ~MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN; writel(irqc, host->base + MESON_MX_SDIO_IRQC); spin_unlock_irqrestore(&host->irq_lock, irqflags); /* * skip the timeout handling if the interrupt handler already processed * the command. */ if (!host->cmd) return; dev_dbg(mmc_dev(host->mmc), "Timeout on CMD%u (IRQS = 0x%08x, ARGU = 0x%08x)\n", host->cmd->opcode, readl(host->base + MESON_MX_SDIO_IRQS), readl(host->base + MESON_MX_SDIO_ARGU)); host->cmd->error = -ETIMEDOUT; meson_mx_mmc_request_done(host); } static struct mmc_host_ops meson_mx_mmc_ops = { .request = meson_mx_mmc_request, .set_ios = meson_mx_mmc_set_ios, .card_busy = meson_mx_mmc_card_busy, .get_cd = mmc_gpio_get_cd, .get_ro = mmc_gpio_get_ro, }; static struct platform_device *meson_mx_mmc_slot_pdev(struct device *parent) { struct device_node *slot_node; struct platform_device *pdev; /* * TODO: the MMC core framework currently does not support * controllers with multiple slots properly. So we only register * the first slot for now */ slot_node = of_get_compatible_child(parent->of_node, "mmc-slot"); if (!slot_node) { dev_warn(parent, "no 'mmc-slot' sub-node found\n"); return ERR_PTR(-ENOENT); } pdev = of_platform_device_create(slot_node, NULL, parent); of_node_put(slot_node); return pdev; } static int meson_mx_mmc_add_host(struct meson_mx_mmc_host *host) { struct mmc_host *mmc = host->mmc; struct device *slot_dev = mmc_dev(mmc); int ret; if (of_property_read_u32(slot_dev->of_node, "reg", &host->slot_id)) { dev_err(slot_dev, "missing 'reg' property\n"); return -EINVAL; } if (host->slot_id >= MESON_MX_SDIO_MAX_SLOTS) { dev_err(slot_dev, "invalid 'reg' property value %d\n", host->slot_id); return -EINVAL; } /* Get regulators and the supported OCR mask */ ret = mmc_regulator_get_supply(mmc); if (ret) return ret; mmc->max_req_size = MESON_MX_SDIO_BOUNCE_REQ_SIZE; mmc->max_seg_size = mmc->max_req_size; mmc->max_blk_count = FIELD_GET(MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK, 0xffffffff); mmc->max_blk_size = FIELD_GET(MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK, 0xffffffff); mmc->max_blk_size -= (4 * MESON_MX_SDIO_RESPONSE_CRC16_BITS); mmc->max_blk_size /= BITS_PER_BYTE; /* Get the min and max supported clock rates */ mmc->f_min = clk_round_rate(host->cfg_div_clk, 1); mmc->f_max = clk_round_rate(host->cfg_div_clk, clk_get_rate(host->parent_clk)); mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23; mmc->ops = &meson_mx_mmc_ops; ret = mmc_of_parse(mmc); if (ret) return ret; ret = mmc_add_host(mmc); if (ret) return ret; return 0; } static int meson_mx_mmc_register_clks(struct meson_mx_mmc_host *host) { struct clk_init_data init; const char *clk_div_parent, *clk_fixed_factor_parent; clk_fixed_factor_parent = __clk_get_name(host->parent_clk); init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL, "%s#fixed_factor", dev_name(host->controller_dev)); if (!init.name) return -ENOMEM; init.ops = &clk_fixed_factor_ops; init.flags = 0; init.parent_names = &clk_fixed_factor_parent; init.num_parents = 1; host->fixed_factor.div = 2; host->fixed_factor.mult = 1; host->fixed_factor.hw.init = &init; host->fixed_factor_clk = devm_clk_register(host->controller_dev, &host->fixed_factor.hw); if (WARN_ON(IS_ERR(host->fixed_factor_clk))) return PTR_ERR(host->fixed_factor_clk); clk_div_parent = __clk_get_name(host->fixed_factor_clk); init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL, "%s#div", dev_name(host->controller_dev)); if (!init.name) return -ENOMEM; init.ops = &clk_divider_ops; init.flags = CLK_SET_RATE_PARENT; init.parent_names = &clk_div_parent; init.num_parents = 1; host->cfg_div.reg = host->base + MESON_MX_SDIO_CONF; host->cfg_div.shift = MESON_MX_SDIO_CONF_CMD_CLK_DIV_SHIFT; host->cfg_div.width = MESON_MX_SDIO_CONF_CMD_CLK_DIV_WIDTH; host->cfg_div.hw.init = &init; host->cfg_div.flags = CLK_DIVIDER_ALLOW_ZERO; host->cfg_div_clk = devm_clk_register(host->controller_dev, &host->cfg_div.hw); if (WARN_ON(IS_ERR(host->cfg_div_clk))) return PTR_ERR(host->cfg_div_clk); return 0; } static int meson_mx_mmc_probe(struct platform_device *pdev) { struct platform_device *slot_pdev; struct mmc_host *mmc; struct meson_mx_mmc_host *host; struct resource *res; int ret, irq; u32 conf; slot_pdev = meson_mx_mmc_slot_pdev(&pdev->dev); if (!slot_pdev) return -ENODEV; else if (IS_ERR(slot_pdev)) return PTR_ERR(slot_pdev); mmc = mmc_alloc_host(sizeof(*host), &slot_pdev->dev); if (!mmc) { ret = -ENOMEM; goto error_unregister_slot_pdev; } host = mmc_priv(mmc); host->mmc = mmc; host->controller_dev = &pdev->dev; spin_lock_init(&host->irq_lock); timer_setup(&host->cmd_timeout, meson_mx_mmc_timeout, 0); platform_set_drvdata(pdev, host); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); host->base = devm_ioremap_resource(host->controller_dev, res); if (IS_ERR(host->base)) { ret = PTR_ERR(host->base); goto error_free_mmc; } irq = platform_get_irq(pdev, 0); ret = devm_request_threaded_irq(host->controller_dev, irq, meson_mx_mmc_irq, meson_mx_mmc_irq_thread, IRQF_ONESHOT, NULL, host); if (ret) goto error_free_mmc; host->core_clk = devm_clk_get(host->controller_dev, "core"); if (IS_ERR(host->core_clk)) { ret = PTR_ERR(host->core_clk); goto error_free_mmc; } host->parent_clk = devm_clk_get(host->controller_dev, "clkin"); if (IS_ERR(host->parent_clk)) { ret = PTR_ERR(host->parent_clk); goto error_free_mmc; } ret = meson_mx_mmc_register_clks(host); if (ret) goto error_free_mmc; ret = clk_prepare_enable(host->core_clk); if (ret) { dev_err(host->controller_dev, "Failed to enable core clock\n"); goto error_free_mmc; } ret = clk_prepare_enable(host->cfg_div_clk); if (ret) { dev_err(host->controller_dev, "Failed to enable MMC clock\n"); goto error_disable_core_clk; } conf = 0; conf |= FIELD_PREP(MESON_MX_SDIO_CONF_CMD_ARGUMENT_BITS_MASK, 39); conf |= FIELD_PREP(MESON_MX_SDIO_CONF_M_ENDIAN_MASK, 0x3); conf |= FIELD_PREP(MESON_MX_SDIO_CONF_WRITE_NWR_MASK, 0x2); conf |= FIELD_PREP(MESON_MX_SDIO_CONF_WRITE_CRC_OK_STATUS_MASK, 0x2); writel(conf, host->base + MESON_MX_SDIO_CONF); meson_mx_mmc_soft_reset(host); ret = meson_mx_mmc_add_host(host); if (ret) goto error_disable_clks; return 0; error_disable_clks: clk_disable_unprepare(host->cfg_div_clk); error_disable_core_clk: clk_disable_unprepare(host->core_clk); error_free_mmc: mmc_free_host(mmc); error_unregister_slot_pdev: of_platform_device_destroy(&slot_pdev->dev, NULL); return ret; } static int meson_mx_mmc_remove(struct platform_device *pdev) { struct meson_mx_mmc_host *host = platform_get_drvdata(pdev); struct device *slot_dev = mmc_dev(host->mmc); del_timer_sync(&host->cmd_timeout); mmc_remove_host(host->mmc); of_platform_device_destroy(slot_dev, NULL); clk_disable_unprepare(host->cfg_div_clk); clk_disable_unprepare(host->core_clk); mmc_free_host(host->mmc); return 0; } static const struct of_device_id meson_mx_mmc_of_match[] = { { .compatible = "amlogic,meson8-sdio", }, { .compatible = "amlogic,meson8b-sdio", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, meson_mx_mmc_of_match); static struct platform_driver meson_mx_mmc_driver = { .probe = meson_mx_mmc_probe, .remove = meson_mx_mmc_remove, .driver = { .name = "meson-mx-sdio", .of_match_table = of_match_ptr(meson_mx_mmc_of_match), }, }; module_platform_driver(meson_mx_mmc_driver); MODULE_DESCRIPTION("Meson6, Meson8 and Meson8b SDIO/MMC Host Driver"); MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>"); MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); MODULE_LICENSE("GPL v2");
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