mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
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8fc9a77bc6
The driver neglects to check the result of platform_get_irq()'s call and
blithely passes the negative error codes to devm_request_threaded_irq()
(which takes *unsigned* IRQ #), causing it to fail with -EINVAL, overriding
an original error code. Stop calling devm_request_threaded_irq() with the
invalid IRQ #s.
Fixes: ed80a13bb4
("mmc: meson-mx-sdio: Add a driver for the Amlogic Meson8 and Meson8b SoC")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20211217202717.10041-3-s.shtylyov@omp.ru
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
773 lines
21 KiB
C
773 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* meson-mx-sdio.c - Meson6, Meson8 and Meson8b SDIO/MMC Host Controller
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*
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* Copyright (C) 2015 Endless Mobile, Inc.
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* Author: Carlo Caione <carlo@endlessm.com>
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* Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
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*/
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#include <linux/bitfield.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/timer.h>
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#include <linux/types.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/sdio.h>
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#include <linux/mmc/slot-gpio.h>
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#define MESON_MX_SDIO_ARGU 0x00
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#define MESON_MX_SDIO_SEND 0x04
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#define MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK GENMASK(7, 0)
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#define MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK GENMASK(15, 8)
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#define MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7 BIT(16)
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#define MESON_MX_SDIO_SEND_RESP_HAS_DATA BIT(17)
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#define MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8 BIT(18)
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#define MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY BIT(19)
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#define MESON_MX_SDIO_SEND_DATA BIT(20)
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#define MESON_MX_SDIO_SEND_USE_INT_WINDOW BIT(21)
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#define MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK GENMASK(31, 24)
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#define MESON_MX_SDIO_CONF 0x08
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#define MESON_MX_SDIO_CONF_CMD_CLK_DIV_SHIFT 0
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#define MESON_MX_SDIO_CONF_CMD_CLK_DIV_WIDTH 10
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#define MESON_MX_SDIO_CONF_CMD_DISABLE_CRC BIT(10)
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#define MESON_MX_SDIO_CONF_CMD_OUT_AT_POSITIVE_EDGE BIT(11)
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#define MESON_MX_SDIO_CONF_CMD_ARGUMENT_BITS_MASK GENMASK(17, 12)
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#define MESON_MX_SDIO_CONF_RESP_LATCH_AT_NEGATIVE_EDGE BIT(18)
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#define MESON_MX_SDIO_CONF_DATA_LATCH_AT_NEGATIVE_EDGE BIT(19)
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#define MESON_MX_SDIO_CONF_BUS_WIDTH BIT(20)
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#define MESON_MX_SDIO_CONF_M_ENDIAN_MASK GENMASK(22, 21)
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#define MESON_MX_SDIO_CONF_WRITE_NWR_MASK GENMASK(28, 23)
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#define MESON_MX_SDIO_CONF_WRITE_CRC_OK_STATUS_MASK GENMASK(31, 29)
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#define MESON_MX_SDIO_IRQS 0x0c
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#define MESON_MX_SDIO_IRQS_STATUS_STATE_MACHINE_MASK GENMASK(3, 0)
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#define MESON_MX_SDIO_IRQS_CMD_BUSY BIT(4)
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#define MESON_MX_SDIO_IRQS_RESP_CRC7_OK BIT(5)
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#define MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK BIT(6)
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#define MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK BIT(7)
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#define MESON_MX_SDIO_IRQS_IF_INT BIT(8)
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#define MESON_MX_SDIO_IRQS_CMD_INT BIT(9)
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#define MESON_MX_SDIO_IRQS_STATUS_INFO_MASK GENMASK(15, 12)
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#define MESON_MX_SDIO_IRQS_TIMING_OUT_INT BIT(16)
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#define MESON_MX_SDIO_IRQS_AMRISC_TIMING_OUT_INT_EN BIT(17)
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#define MESON_MX_SDIO_IRQS_ARC_TIMING_OUT_INT_EN BIT(18)
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#define MESON_MX_SDIO_IRQS_TIMING_OUT_COUNT_MASK GENMASK(31, 19)
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#define MESON_MX_SDIO_IRQC 0x10
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#define MESON_MX_SDIO_IRQC_ARC_IF_INT_EN BIT(3)
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#define MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN BIT(4)
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#define MESON_MX_SDIO_IRQC_IF_CONFIG_MASK GENMASK(7, 6)
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#define MESON_MX_SDIO_IRQC_FORCE_DATA_CLK BIT(8)
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#define MESON_MX_SDIO_IRQC_FORCE_DATA_CMD BIT(9)
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#define MESON_MX_SDIO_IRQC_FORCE_DATA_DAT_MASK GENMASK(13, 10)
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#define MESON_MX_SDIO_IRQC_SOFT_RESET BIT(15)
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#define MESON_MX_SDIO_IRQC_FORCE_HALT BIT(30)
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#define MESON_MX_SDIO_IRQC_HALT_HOLE BIT(31)
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#define MESON_MX_SDIO_MULT 0x14
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#define MESON_MX_SDIO_MULT_PORT_SEL_MASK GENMASK(1, 0)
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#define MESON_MX_SDIO_MULT_MEMORY_STICK_ENABLE BIT(2)
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#define MESON_MX_SDIO_MULT_MEMORY_STICK_SCLK_ALWAYS BIT(3)
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#define MESON_MX_SDIO_MULT_STREAM_ENABLE BIT(4)
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#define MESON_MX_SDIO_MULT_STREAM_8BITS_MODE BIT(5)
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#define MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX BIT(8)
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#define MESON_MX_SDIO_MULT_DAT0_DAT1_SWAPPED BIT(10)
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#define MESON_MX_SDIO_MULT_DAT1_DAT0_SWAPPED BIT(11)
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#define MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK GENMASK(15, 12)
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#define MESON_MX_SDIO_ADDR 0x18
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#define MESON_MX_SDIO_EXT 0x1c
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#define MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK GENMASK(29, 16)
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#define MESON_MX_SDIO_BOUNCE_REQ_SIZE (128 * 1024)
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#define MESON_MX_SDIO_RESPONSE_CRC16_BITS (16 - 1)
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#define MESON_MX_SDIO_MAX_SLOTS 3
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struct meson_mx_mmc_host {
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struct device *controller_dev;
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struct clk *parent_clk;
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struct clk *core_clk;
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struct clk_divider cfg_div;
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struct clk *cfg_div_clk;
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struct clk_fixed_factor fixed_factor;
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struct clk *fixed_factor_clk;
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void __iomem *base;
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int irq;
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spinlock_t irq_lock;
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struct timer_list cmd_timeout;
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unsigned int slot_id;
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struct mmc_host *mmc;
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struct mmc_request *mrq;
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struct mmc_command *cmd;
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int error;
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};
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static void meson_mx_mmc_mask_bits(struct mmc_host *mmc, char reg, u32 mask,
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u32 val)
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{
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struct meson_mx_mmc_host *host = mmc_priv(mmc);
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u32 regval;
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regval = readl(host->base + reg);
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regval &= ~mask;
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regval |= (val & mask);
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writel(regval, host->base + reg);
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}
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static void meson_mx_mmc_soft_reset(struct meson_mx_mmc_host *host)
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{
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writel(MESON_MX_SDIO_IRQC_SOFT_RESET, host->base + MESON_MX_SDIO_IRQC);
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udelay(2);
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}
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static struct mmc_command *meson_mx_mmc_get_next_cmd(struct mmc_command *cmd)
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{
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if (cmd->opcode == MMC_SET_BLOCK_COUNT && !cmd->error)
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return cmd->mrq->cmd;
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else if (mmc_op_multi(cmd->opcode) &&
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(!cmd->mrq->sbc || cmd->error || cmd->data->error))
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return cmd->mrq->stop;
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else
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return NULL;
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}
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static void meson_mx_mmc_start_cmd(struct mmc_host *mmc,
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struct mmc_command *cmd)
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{
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struct meson_mx_mmc_host *host = mmc_priv(mmc);
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unsigned int pack_size;
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unsigned long irqflags, timeout;
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u32 mult, send = 0, ext = 0;
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host->cmd = cmd;
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if (cmd->busy_timeout)
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timeout = msecs_to_jiffies(cmd->busy_timeout);
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else
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timeout = msecs_to_jiffies(1000);
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switch (mmc_resp_type(cmd)) {
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case MMC_RSP_R1:
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case MMC_RSP_R1B:
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case MMC_RSP_R3:
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/* 7 (CMD) + 32 (response) + 7 (CRC) -1 */
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send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 45);
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break;
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case MMC_RSP_R2:
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/* 7 (CMD) + 120 (response) + 7 (CRC) -1 */
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send |= FIELD_PREP(MESON_MX_SDIO_SEND_CMD_RESP_BITS_MASK, 133);
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send |= MESON_MX_SDIO_SEND_RESP_CRC7_FROM_8;
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break;
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default:
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break;
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}
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if (!(cmd->flags & MMC_RSP_CRC))
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send |= MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7;
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if (cmd->flags & MMC_RSP_BUSY)
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send |= MESON_MX_SDIO_SEND_CHECK_DAT0_BUSY;
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if (cmd->data) {
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send |= FIELD_PREP(MESON_MX_SDIO_SEND_REPEAT_PACKAGE_TIMES_MASK,
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(cmd->data->blocks - 1));
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pack_size = cmd->data->blksz * BITS_PER_BYTE;
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if (mmc->ios.bus_width == MMC_BUS_WIDTH_4)
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pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 4;
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else
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pack_size += MESON_MX_SDIO_RESPONSE_CRC16_BITS * 1;
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ext |= FIELD_PREP(MESON_MX_SDIO_EXT_DATA_RW_NUMBER_MASK,
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pack_size);
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if (cmd->data->flags & MMC_DATA_WRITE)
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send |= MESON_MX_SDIO_SEND_DATA;
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else
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send |= MESON_MX_SDIO_SEND_RESP_HAS_DATA;
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cmd->data->bytes_xfered = 0;
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}
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send |= FIELD_PREP(MESON_MX_SDIO_SEND_COMMAND_INDEX_MASK,
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(0x40 | cmd->opcode));
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spin_lock_irqsave(&host->irq_lock, irqflags);
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mult = readl(host->base + MESON_MX_SDIO_MULT);
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mult &= ~MESON_MX_SDIO_MULT_PORT_SEL_MASK;
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mult |= FIELD_PREP(MESON_MX_SDIO_MULT_PORT_SEL_MASK, host->slot_id);
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mult |= BIT(31);
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writel(mult, host->base + MESON_MX_SDIO_MULT);
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/* enable the CMD done interrupt */
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meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQC,
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MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN,
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MESON_MX_SDIO_IRQC_ARC_CMD_INT_EN);
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/* clear pending interrupts */
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meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_IRQS,
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MESON_MX_SDIO_IRQS_CMD_INT,
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MESON_MX_SDIO_IRQS_CMD_INT);
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writel(cmd->arg, host->base + MESON_MX_SDIO_ARGU);
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writel(ext, host->base + MESON_MX_SDIO_EXT);
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writel(send, host->base + MESON_MX_SDIO_SEND);
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spin_unlock_irqrestore(&host->irq_lock, irqflags);
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mod_timer(&host->cmd_timeout, jiffies + timeout);
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}
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static void meson_mx_mmc_request_done(struct meson_mx_mmc_host *host)
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{
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struct mmc_request *mrq;
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mrq = host->mrq;
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if (host->cmd->error)
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meson_mx_mmc_soft_reset(host);
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host->mrq = NULL;
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host->cmd = NULL;
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mmc_request_done(host->mmc, mrq);
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}
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static void meson_mx_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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{
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struct meson_mx_mmc_host *host = mmc_priv(mmc);
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unsigned short vdd = ios->vdd;
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unsigned long clk_rate = ios->clock;
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switch (ios->bus_width) {
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case MMC_BUS_WIDTH_1:
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meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF,
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MESON_MX_SDIO_CONF_BUS_WIDTH, 0);
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break;
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case MMC_BUS_WIDTH_4:
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meson_mx_mmc_mask_bits(mmc, MESON_MX_SDIO_CONF,
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MESON_MX_SDIO_CONF_BUS_WIDTH,
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MESON_MX_SDIO_CONF_BUS_WIDTH);
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break;
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case MMC_BUS_WIDTH_8:
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default:
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dev_err(mmc_dev(mmc), "unsupported bus width: %d\n",
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ios->bus_width);
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host->error = -EINVAL;
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return;
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}
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host->error = clk_set_rate(host->cfg_div_clk, ios->clock);
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if (host->error) {
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dev_warn(mmc_dev(mmc),
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"failed to set MMC clock to %lu: %d\n",
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clk_rate, host->error);
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return;
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}
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mmc->actual_clock = clk_get_rate(host->cfg_div_clk);
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switch (ios->power_mode) {
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case MMC_POWER_OFF:
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vdd = 0;
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fallthrough;
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case MMC_POWER_UP:
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if (!IS_ERR(mmc->supply.vmmc)) {
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host->error = mmc_regulator_set_ocr(mmc,
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mmc->supply.vmmc,
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vdd);
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if (host->error)
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return;
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}
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break;
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}
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}
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static int meson_mx_mmc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
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{
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struct mmc_data *data = mrq->data;
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int dma_len;
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struct scatterlist *sg;
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if (!data)
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return 0;
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sg = data->sg;
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if (sg->offset & 3 || sg->length & 3) {
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dev_err(mmc_dev(mmc),
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"unaligned scatterlist: offset %x length %d\n",
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sg->offset, sg->length);
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return -EINVAL;
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}
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dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
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mmc_get_dma_dir(data));
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if (dma_len <= 0) {
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dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
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return -ENOMEM;
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}
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return 0;
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}
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static void meson_mx_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
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{
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struct meson_mx_mmc_host *host = mmc_priv(mmc);
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struct mmc_command *cmd = mrq->cmd;
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if (!host->error)
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host->error = meson_mx_mmc_map_dma(mmc, mrq);
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if (host->error) {
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cmd->error = host->error;
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mmc_request_done(mmc, mrq);
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return;
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}
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host->mrq = mrq;
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if (mrq->data)
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writel(sg_dma_address(mrq->data->sg),
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host->base + MESON_MX_SDIO_ADDR);
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if (mrq->sbc)
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meson_mx_mmc_start_cmd(mmc, mrq->sbc);
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else
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meson_mx_mmc_start_cmd(mmc, mrq->cmd);
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}
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static void meson_mx_mmc_read_response(struct mmc_host *mmc,
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struct mmc_command *cmd)
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{
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struct meson_mx_mmc_host *host = mmc_priv(mmc);
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u32 mult;
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int i, resp[4];
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mult = readl(host->base + MESON_MX_SDIO_MULT);
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mult |= MESON_MX_SDIO_MULT_WR_RD_OUT_INDEX;
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mult &= ~MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK;
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mult |= FIELD_PREP(MESON_MX_SDIO_MULT_RESP_READ_INDEX_MASK, 0);
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writel(mult, host->base + MESON_MX_SDIO_MULT);
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if (cmd->flags & MMC_RSP_136) {
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for (i = 0; i <= 3; i++)
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resp[3 - i] = readl(host->base + MESON_MX_SDIO_ARGU);
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cmd->resp[0] = (resp[0] << 8) | ((resp[1] >> 24) & 0xff);
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cmd->resp[1] = (resp[1] << 8) | ((resp[2] >> 24) & 0xff);
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cmd->resp[2] = (resp[2] << 8) | ((resp[3] >> 24) & 0xff);
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cmd->resp[3] = (resp[3] << 8);
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} else if (cmd->flags & MMC_RSP_PRESENT) {
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cmd->resp[0] = readl(host->base + MESON_MX_SDIO_ARGU);
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}
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}
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static irqreturn_t meson_mx_mmc_process_cmd_irq(struct meson_mx_mmc_host *host,
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u32 irqs, u32 send)
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{
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struct mmc_command *cmd = host->cmd;
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/*
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* NOTE: even though it shouldn't happen we sometimes get command
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* interrupts twice (at least this is what it looks like). Ideally
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* we find out why this happens and warn here as soon as it occurs.
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*/
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if (!cmd)
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return IRQ_HANDLED;
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cmd->error = 0;
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meson_mx_mmc_read_response(host->mmc, cmd);
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if (cmd->data) {
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if (!((irqs & MESON_MX_SDIO_IRQS_DATA_READ_CRC16_OK) ||
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(irqs & MESON_MX_SDIO_IRQS_DATA_WRITE_CRC16_OK)))
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cmd->error = -EILSEQ;
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} else {
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if (!((irqs & MESON_MX_SDIO_IRQS_RESP_CRC7_OK) ||
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(send & MESON_MX_SDIO_SEND_RESP_WITHOUT_CRC7)))
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cmd->error = -EILSEQ;
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}
|
|
|
|
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;
|
|
irqreturn_t ret;
|
|
|
|
spin_lock(&host->irq_lock);
|
|
|
|
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(&host->irq_lock);
|
|
|
|
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,
|
|
.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_CMD23 | MMC_CAP_WAIT_WHILE_BUSY;
|
|
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;
|
|
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);
|
|
|
|
host->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(host->base)) {
|
|
ret = PTR_ERR(host->base);
|
|
goto error_free_mmc;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
ret = irq;
|
|
goto error_free_mmc;
|
|
}
|
|
|
|
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",
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
.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");
|