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u-boot/drivers/mmc/jz_mmc.c
Ezequiel Garcia 82d5464788 mmc: jz_mmc: Compile-out write support if disabled 
Do not build write support, unless it's enabled.

In the SPL case, this change will typically remove
precious bytes (as write support is most often
not needed in SPL).

This is important on this platform, where the maximum
SPL size is 14 KiB.

With gcc v7.3, this change saves 144 bytes producing:

size spl/u-boot-spl
   text	   data	    bss	    dec	    hex	filename
   9240	    752	    712	  10704	   29d0	spl/u-boot-spl

To make the code easier to compile-out and more
readable, a pair of read_data/write_data helpers are created.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
2019-01-16 13:56:43 +01:00

506 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
/*
* Ingenic JZ MMC driver
*
* Copyright (c) 2013 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*/
#include <common.h>
#include <malloc.h>
#include <mmc.h>
#include <asm/io.h>
#include <asm/unaligned.h>
#include <errno.h>
#include <mach/jz4780.h>
#include <wait_bit.h>
/* Registers */
#define MSC_STRPCL 0x000
#define MSC_STAT 0x004
#define MSC_CLKRT 0x008
#define MSC_CMDAT 0x00c
#define MSC_RESTO 0x010
#define MSC_RDTO 0x014
#define MSC_BLKLEN 0x018
#define MSC_NOB 0x01c
#define MSC_SNOB 0x020
#define MSC_IMASK 0x024
#define MSC_IREG 0x028
#define MSC_CMD 0x02c
#define MSC_ARG 0x030
#define MSC_RES 0x034
#define MSC_RXFIFO 0x038
#define MSC_TXFIFO 0x03c
#define MSC_LPM 0x040
#define MSC_DMAC 0x044
#define MSC_DMANDA 0x048
#define MSC_DMADA 0x04c
#define MSC_DMALEN 0x050
#define MSC_DMACMD 0x054
#define MSC_CTRL2 0x058
#define MSC_RTCNT 0x05c
#define MSC_DBG 0x0fc
/* MSC Clock and Control Register (MSC_STRPCL) */
#define MSC_STRPCL_EXIT_MULTIPLE BIT(7)
#define MSC_STRPCL_EXIT_TRANSFER BIT(6)
#define MSC_STRPCL_START_READWAIT BIT(5)
#define MSC_STRPCL_STOP_READWAIT BIT(4)
#define MSC_STRPCL_RESET BIT(3)
#define MSC_STRPCL_START_OP BIT(2)
#define MSC_STRPCL_CLOCK_CONTROL_STOP BIT(0)
#define MSC_STRPCL_CLOCK_CONTROL_START BIT(1)
/* MSC Status Register (MSC_STAT) */
#define MSC_STAT_AUTO_CMD_DONE BIT(31)
#define MSC_STAT_IS_RESETTING BIT(15)
#define MSC_STAT_SDIO_INT_ACTIVE BIT(14)
#define MSC_STAT_PRG_DONE BIT(13)
#define MSC_STAT_DATA_TRAN_DONE BIT(12)
#define MSC_STAT_END_CMD_RES BIT(11)
#define MSC_STAT_DATA_FIFO_AFULL BIT(10)
#define MSC_STAT_IS_READWAIT BIT(9)
#define MSC_STAT_CLK_EN BIT(8)
#define MSC_STAT_DATA_FIFO_FULL BIT(7)
#define MSC_STAT_DATA_FIFO_EMPTY BIT(6)
#define MSC_STAT_CRC_RES_ERR BIT(5)
#define MSC_STAT_CRC_READ_ERROR BIT(4)
#define MSC_STAT_CRC_WRITE_ERROR BIT(2)
#define MSC_STAT_CRC_WRITE_ERROR_NOSTS BIT(4)
#define MSC_STAT_TIME_OUT_RES BIT(1)
#define MSC_STAT_TIME_OUT_READ BIT(0)
/* MSC Bus Clock Control Register (MSC_CLKRT) */
#define MSC_CLKRT_CLK_RATE_MASK 0x7
/* MSC Command Sequence Control Register (MSC_CMDAT) */
#define MSC_CMDAT_IO_ABORT BIT(11)
#define MSC_CMDAT_BUS_WIDTH_1BIT (0x0 << 9)
#define MSC_CMDAT_BUS_WIDTH_4BIT (0x2 << 9)
#define MSC_CMDAT_DMA_EN BIT(8)
#define MSC_CMDAT_INIT BIT(7)
#define MSC_CMDAT_BUSY BIT(6)
#define MSC_CMDAT_STREAM_BLOCK BIT(5)
#define MSC_CMDAT_WRITE BIT(4)
#define MSC_CMDAT_DATA_EN BIT(3)
#define MSC_CMDAT_RESPONSE_MASK (0x7 << 0)
#define MSC_CMDAT_RESPONSE_NONE (0x0 << 0) /* No response */
#define MSC_CMDAT_RESPONSE_R1 (0x1 << 0) /* Format R1 and R1b */
#define MSC_CMDAT_RESPONSE_R2 (0x2 << 0) /* Format R2 */
#define MSC_CMDAT_RESPONSE_R3 (0x3 << 0) /* Format R3 */
#define MSC_CMDAT_RESPONSE_R4 (0x4 << 0) /* Format R4 */
#define MSC_CMDAT_RESPONSE_R5 (0x5 << 0) /* Format R5 */
#define MSC_CMDAT_RESPONSE_R6 (0x6 << 0) /* Format R6 */
/* MSC Interrupts Mask Register (MSC_IMASK) */
#define MSC_IMASK_TIME_OUT_RES BIT(9)
#define MSC_IMASK_TIME_OUT_READ BIT(8)
#define MSC_IMASK_SDIO BIT(7)
#define MSC_IMASK_TXFIFO_WR_REQ BIT(6)
#define MSC_IMASK_RXFIFO_RD_REQ BIT(5)
#define MSC_IMASK_END_CMD_RES BIT(2)
#define MSC_IMASK_PRG_DONE BIT(1)
#define MSC_IMASK_DATA_TRAN_DONE BIT(0)
/* MSC Interrupts Status Register (MSC_IREG) */
#define MSC_IREG_TIME_OUT_RES BIT(9)
#define MSC_IREG_TIME_OUT_READ BIT(8)
#define MSC_IREG_SDIO BIT(7)
#define MSC_IREG_TXFIFO_WR_REQ BIT(6)
#define MSC_IREG_RXFIFO_RD_REQ BIT(5)
#define MSC_IREG_END_CMD_RES BIT(2)
#define MSC_IREG_PRG_DONE BIT(1)
#define MSC_IREG_DATA_TRAN_DONE BIT(0)
struct jz_mmc_plat {
struct mmc_config cfg;
struct mmc mmc;
};
struct jz_mmc_priv {
void __iomem *regs;
u32 flags;
/* priv flags */
#define JZ_MMC_BUS_WIDTH_MASK 0x3
#define JZ_MMC_BUS_WIDTH_1 0x0
#define JZ_MMC_BUS_WIDTH_4 0x2
#define JZ_MMC_BUS_WIDTH_8 0x3
#define JZ_MMC_SENT_INIT BIT(2)
};
static int jz_mmc_clock_rate(void)
{
return 24000000;
}
#if CONFIG_IS_ENABLED(MMC_WRITE)
static inline void jz_mmc_write_data(struct jz_mmc_priv *priv, struct mmc_data *data)
{
int sz = DIV_ROUND_UP(data->blocks * data->blocksize, 4);
const void *buf = data->src;
while (sz--) {
u32 val = get_unaligned_le32(buf);
wait_for_bit_le32(priv->regs + MSC_IREG,
MSC_IREG_TXFIFO_WR_REQ,
true, 10000, false);
writel(val, priv->regs + MSC_TXFIFO);
buf += 4;
}
}
#else
static void jz_mmc_write_data(struct jz_mmc_priv *priv, struct mmc_data *data)
{}
#endif
static inline int jz_mmc_read_data(struct jz_mmc_priv *priv, struct mmc_data *data)
{
int sz = data->blocks * data->blocksize;
void *buf = data->dest;
u32 stat, val;
do {
stat = readl(priv->regs + MSC_STAT);
if (stat & MSC_STAT_TIME_OUT_READ)
return -ETIMEDOUT;
if (stat & MSC_STAT_CRC_READ_ERROR)
return -EINVAL;
if (stat & MSC_STAT_DATA_FIFO_EMPTY) {
udelay(10);
continue;
}
do {
val = readl(priv->regs + MSC_RXFIFO);
if (sz == 1)
*(u8 *)buf = (u8)val;
else if (sz == 2)
put_unaligned_le16(val, buf);
else if (sz >= 4)
put_unaligned_le32(val, buf);
buf += 4;
sz -= 4;
stat = readl(priv->regs + MSC_STAT);
} while (!(stat & MSC_STAT_DATA_FIFO_EMPTY));
} while (!(stat & MSC_STAT_DATA_TRAN_DONE));
return 0;
}
static int jz_mmc_send_cmd(struct mmc *mmc, struct jz_mmc_priv *priv,
struct mmc_cmd *cmd, struct mmc_data *data)
{
u32 stat, mask, cmdat = 0;
int i, ret;
/* stop the clock */
writel(MSC_STRPCL_CLOCK_CONTROL_STOP, priv->regs + MSC_STRPCL);
ret = wait_for_bit_le32(priv->regs + MSC_STAT,
MSC_STAT_CLK_EN, false, 10000, false);
if (ret)
return ret;
writel(0, priv->regs + MSC_DMAC);
/* setup command */
writel(cmd->cmdidx, priv->regs + MSC_CMD);
writel(cmd->cmdarg, priv->regs + MSC_ARG);
if (data) {
/* setup data */
cmdat |= MSC_CMDAT_DATA_EN;
if (data->flags & MMC_DATA_WRITE)
cmdat |= MSC_CMDAT_WRITE;
writel(data->blocks, priv->regs + MSC_NOB);
writel(data->blocksize, priv->regs + MSC_BLKLEN);
} else {
writel(0, priv->regs + MSC_NOB);
writel(0, priv->regs + MSC_BLKLEN);
}
/* setup response */
switch (cmd->resp_type) {
case MMC_RSP_NONE:
break;
case MMC_RSP_R1:
case MMC_RSP_R1b:
cmdat |= MSC_CMDAT_RESPONSE_R1;
break;
case MMC_RSP_R2:
cmdat |= MSC_CMDAT_RESPONSE_R2;
break;
case MMC_RSP_R3:
cmdat |= MSC_CMDAT_RESPONSE_R3;
break;
default:
break;
}
if (cmd->resp_type & MMC_RSP_BUSY)
cmdat |= MSC_CMDAT_BUSY;
/* set init for the first command only */
if (!(priv->flags & JZ_MMC_SENT_INIT)) {
cmdat |= MSC_CMDAT_INIT;
priv->flags |= JZ_MMC_SENT_INIT;
}
cmdat |= (priv->flags & JZ_MMC_BUS_WIDTH_MASK) << 9;
/* write the data setup */
writel(cmdat, priv->regs + MSC_CMDAT);
/* unmask interrupts */
mask = 0xffffffff & ~(MSC_IMASK_END_CMD_RES | MSC_IMASK_TIME_OUT_RES);
if (data) {
mask &= ~MSC_IMASK_DATA_TRAN_DONE;
if (data->flags & MMC_DATA_WRITE) {
mask &= ~MSC_IMASK_TXFIFO_WR_REQ;
} else {
mask &= ~(MSC_IMASK_RXFIFO_RD_REQ |
MSC_IMASK_TIME_OUT_READ);
}
}
writel(mask, priv->regs + MSC_IMASK);
/* clear interrupts */
writel(0xffffffff, priv->regs + MSC_IREG);
/* start the command (& the clock) */
writel(MSC_STRPCL_START_OP | MSC_STRPCL_CLOCK_CONTROL_START,
priv->regs + MSC_STRPCL);
/* wait for completion */
for (i = 0; i < 100; i++) {
stat = readl(priv->regs + MSC_IREG);
stat &= MSC_IREG_END_CMD_RES | MSC_IREG_TIME_OUT_RES;
if (stat)
break;
mdelay(1);
}
writel(stat, priv->regs + MSC_IREG);
if (stat & MSC_IREG_TIME_OUT_RES)
return -ETIMEDOUT;
if (cmd->resp_type & MMC_RSP_PRESENT) {
/* read the response */
if (cmd->resp_type & MMC_RSP_136) {
u16 a, b, c, i;
a = readw(priv->regs + MSC_RES);
for (i = 0; i < 4; i++) {
b = readw(priv->regs + MSC_RES);
c = readw(priv->regs + MSC_RES);
cmd->response[i] =
(a << 24) | (b << 8) | (c >> 8);
a = c;
}
} else {
cmd->response[0] = readw(priv->regs + MSC_RES) << 24;
cmd->response[0] |= readw(priv->regs + MSC_RES) << 8;
cmd->response[0] |= readw(priv->regs + MSC_RES) & 0xff;
}
}
if (data) {
if (data->flags & MMC_DATA_WRITE)
jz_mmc_write_data(priv, data);
else if (data->flags & MMC_DATA_READ) {
ret = jz_mmc_read_data(priv, data);
if (ret)
return ret;
}
}
return 0;
}
static int jz_mmc_set_ios(struct mmc *mmc, struct jz_mmc_priv *priv)
{
u32 real_rate = jz_mmc_clock_rate();
u8 clk_div = 0;
/* calculate clock divide */
while ((real_rate > mmc->clock) && (clk_div < 7)) {
real_rate >>= 1;
clk_div++;
}
writel(clk_div & MSC_CLKRT_CLK_RATE_MASK, priv->regs + MSC_CLKRT);
/* set the bus width for the next command */
priv->flags &= ~JZ_MMC_BUS_WIDTH_MASK;
if (mmc->bus_width == 8)
priv->flags |= JZ_MMC_BUS_WIDTH_8;
else if (mmc->bus_width == 4)
priv->flags |= JZ_MMC_BUS_WIDTH_4;
else
priv->flags |= JZ_MMC_BUS_WIDTH_1;
return 0;
}
static int jz_mmc_core_init(struct mmc *mmc)
{
struct jz_mmc_priv *priv = mmc->priv;
int ret;
/* Reset */
writel(MSC_STRPCL_RESET, priv->regs + MSC_STRPCL);
ret = wait_for_bit_le32(priv->regs + MSC_STAT,
MSC_STAT_IS_RESETTING, false, 10000, false);
if (ret)
return ret;
/* Maximum timeouts */
writel(0xffff, priv->regs + MSC_RESTO);
writel(0xffffffff, priv->regs + MSC_RDTO);
/* Enable low power mode */
writel(0x1, priv->regs + MSC_LPM);
return 0;
}
#if !CONFIG_IS_ENABLED(DM_MMC)
static int jz_mmc_legacy_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
struct mmc_data *data)
{
struct jz_mmc_priv *priv = mmc->priv;
return jz_mmc_send_cmd(mmc, priv, cmd, data);
}
static int jz_mmc_legacy_set_ios(struct mmc *mmc)
{
struct jz_mmc_priv *priv = mmc->priv;
return jz_mmc_set_ios(mmc, priv);
};
static const struct mmc_ops jz_msc_ops = {
.send_cmd = jz_mmc_legacy_send_cmd,
.set_ios = jz_mmc_legacy_set_ios,
.init = jz_mmc_core_init,
};
static struct jz_mmc_priv jz_mmc_priv_static;
static struct jz_mmc_plat jz_mmc_plat_static = {
.cfg = {
.name = "MSC",
.ops = &jz_msc_ops,
.voltages = MMC_VDD_27_28 | MMC_VDD_28_29 | MMC_VDD_29_30 |
MMC_VDD_30_31 | MMC_VDD_31_32 | MMC_VDD_32_33 |
MMC_VDD_33_34 | MMC_VDD_34_35 | MMC_VDD_35_36,
.host_caps = MMC_MODE_4BIT | MMC_MODE_HS_52MHz | MMC_MODE_HS,
.f_min = 375000,
.f_max = 48000000,
.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT,
},
};
int jz_mmc_init(void __iomem *base)
{
struct mmc *mmc;
jz_mmc_priv_static.regs = base;
mmc = mmc_create(&jz_mmc_plat_static.cfg, &jz_mmc_priv_static);
return mmc ? 0 : -ENODEV;
}
#else /* CONFIG_DM_MMC */
#include <dm.h>
DECLARE_GLOBAL_DATA_PTR;
static int jz_mmc_dm_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
struct mmc_data *data)
{
struct jz_mmc_priv *priv = dev_get_priv(dev);
struct mmc *mmc = mmc_get_mmc_dev(dev);
return jz_mmc_send_cmd(mmc, priv, cmd, data);
}
static int jz_mmc_dm_set_ios(struct udevice *dev)
{
struct jz_mmc_priv *priv = dev_get_priv(dev);
struct mmc *mmc = mmc_get_mmc_dev(dev);
return jz_mmc_set_ios(mmc, priv);
};
static const struct dm_mmc_ops jz_msc_ops = {
.send_cmd = jz_mmc_dm_send_cmd,
.set_ios = jz_mmc_dm_set_ios,
};
static int jz_mmc_ofdata_to_platdata(struct udevice *dev)
{
struct jz_mmc_priv *priv = dev_get_priv(dev);
struct jz_mmc_plat *plat = dev_get_platdata(dev);
struct mmc_config *cfg;
int ret;
priv->regs = map_physmem(devfdt_get_addr(dev), 0x100, MAP_NOCACHE);
cfg = &plat->cfg;
cfg->name = "MSC";
cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS;
ret = mmc_of_parse(dev, cfg);
if (ret < 0) {
dev_err(dev, "failed to parse host caps\n");
return ret;
}
cfg->f_min = 400000;
cfg->f_max = 52000000;
cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
return 0;
}
static int jz_mmc_bind(struct udevice *dev)
{
struct jz_mmc_plat *plat = dev_get_platdata(dev);
return mmc_bind(dev, &plat->mmc, &plat->cfg);
}
static int jz_mmc_probe(struct udevice *dev)
{
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct jz_mmc_priv *priv = dev_get_priv(dev);
struct jz_mmc_plat *plat = dev_get_platdata(dev);
plat->mmc.priv = priv;
upriv->mmc = &plat->mmc;
return jz_mmc_core_init(&plat->mmc);
}
static const struct udevice_id jz_mmc_ids[] = {
{ .compatible = "ingenic,jz4780-mmc" },
{ }
};
U_BOOT_DRIVER(jz_mmc_drv) = {
.name = "jz_mmc",
.id = UCLASS_MMC,
.of_match = jz_mmc_ids,
.ofdata_to_platdata = jz_mmc_ofdata_to_platdata,
.bind = jz_mmc_bind,
.probe = jz_mmc_probe,
.priv_auto_alloc_size = sizeof(struct jz_mmc_priv),
.platdata_auto_alloc_size = sizeof(struct jz_mmc_plat),
.ops = &jz_msc_ops,
};
#endif /* CONFIG_DM_MMC */
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