[PATCH v1 1/6] mci: atmel_mci: add PBL support
Oleksij Rempel
o.rempel at pengutronix.de
Fri Apr 9 14:11:44 BST 2021
Move most of the atmel_mci code to atmel_mci_common.c and introduce
atmel_mci_pbl.c for the PBL part.
Signed-off-by: Oleksij Rempel <o.rempel at pengutronix.de>
---
arch/arm/mach-at91/include/mach/xload.h | 2 +
drivers/mci/Kconfig | 4 +
drivers/mci/Makefile | 3 +-
drivers/mci/atmel-mci-regs.h | 37 ++
drivers/mci/atmel_mci.c | 494 +-----------------------
drivers/mci/atmel_mci_common.c | 465 ++++++++++++++++++++++
drivers/mci/atmel_mci_pbl.c | 115 ++++++
7 files changed, 644 insertions(+), 476 deletions(-)
create mode 100644 drivers/mci/atmel_mci_common.c
create mode 100644 drivers/mci/atmel_mci_pbl.c
diff --git a/arch/arm/mach-at91/include/mach/xload.h b/arch/arm/mach-at91/include/mach/xload.h
index 338577c221..9201e7d0b7 100644
--- a/arch/arm/mach-at91/include/mach/xload.h
+++ b/arch/arm/mach-at91/include/mach/xload.h
@@ -7,5 +7,7 @@
void __noreturn sama5d2_sdhci_start_image(u32 r4);
int at91_sdhci_bio_init(struct pbl_bio *bio, void __iomem *base);
+int at91_mci_bio_init(struct pbl_bio *bio, void __iomem *base,
+ unsigned int clock, unsigned int slot);
#endif /* __MACH_XLOAD_H */
diff --git a/drivers/mci/Kconfig b/drivers/mci/Kconfig
index b4c4072596..7d4e72138d 100644
--- a/drivers/mci/Kconfig
+++ b/drivers/mci/Kconfig
@@ -210,6 +210,10 @@ config MCI_IMX_ESDHC_PBL
bool
select MCI_SDHCI
+config MCI_ATMEL_PBL
+ bool
+ select MCI_ATMEL
+
config MCI_ATMEL_SDHCI_PBL
bool
select MCI_SDHCI
diff --git a/drivers/mci/Makefile b/drivers/mci/Makefile
index 4a53633674..60dc100c37 100644
--- a/drivers/mci/Makefile
+++ b/drivers/mci/Makefile
@@ -1,10 +1,11 @@
obj-$(CONFIG_MCI) += mci-core.o
obj-$(CONFIG_MCI_ARASAN) += arasan-sdhci.o
-obj-$(CONFIG_MCI_ATMEL) += atmel_mci.o
+obj-$(CONFIG_MCI_ATMEL) += atmel_mci.o atmel_mci_common.o
obj-$(CONFIG_MCI_ATMEL_SDHCI) += atmel-sdhci.o atmel-sdhci-common.o
obj-$(CONFIG_MCI_BCM283X) += mci-bcm2835.o
obj-$(CONFIG_MCI_BCM283X_SDHOST) += bcm2835-sdhost.o
obj-$(CONFIG_MCI_DOVE) += dove-sdhci.o
+pbl-$(CONFIG_MCI_ATMEL_PBL) += atmel_mci_pbl.o atmel_mci_common.o
pbl-$(CONFIG_MCI_ATMEL_SDHCI_PBL) += atmel-sdhci-pbl.o atmel-sdhci-common.o
obj-$(CONFIG_MCI_IMX) += imx.o
obj-$(CONFIG_MCI_IMX_ESDHC) += imx-esdhc.o imx-esdhc-common.o
diff --git a/drivers/mci/atmel-mci-regs.h b/drivers/mci/atmel-mci-regs.h
index 676f419601..045c1a9f38 100644
--- a/drivers/mci/atmel-mci-regs.h
+++ b/drivers/mci/atmel-mci-regs.h
@@ -144,6 +144,37 @@
# define ATMCI_PDC_CONNECTED 1
#endif
+struct atmel_mci_caps {
+ bool has_cfg_reg;
+ bool has_highspeed;
+ bool has_rwproof;
+ bool has_odd_clk_div;
+ bool need_reset_after_xfer;
+};
+
+struct atmel_mci {
+ struct mci_host mci;
+ void __iomem *regs;
+ struct device_d *hw_dev;
+ struct clk *clk;
+
+ u32 datasize;
+ struct mci_cmd *cmd;
+ struct mci_data *data;
+ unsigned slot_b;
+ int version;
+ struct atmel_mci_caps caps;
+
+ unsigned long bus_hz;
+ u32 mode_reg;
+ u32 cfg_reg;
+ u32 sdc_reg;
+ bool need_reset;
+ int detect_pin;
+};
+
+#define to_mci_host(mci) container_of(mci, struct atmel_mci, mci)
+
/*
* Fix sconfig's burst size according to atmel MCI. We need to convert them as:
* 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
@@ -158,4 +189,10 @@ static inline unsigned int atmci_convert_chksize(unsigned int maxburst)
return 0;
}
+void atmci_common_set_ios(struct atmel_mci *host, struct mci_ios *ios);
+int atmci_reset(struct mci_host *mci, struct device_d *mci_dev);
+int atmci_common_request(struct atmel_mci *host, struct mci_cmd *cmd,
+ struct mci_data *data);
+void atmci_get_cap(struct atmel_mci *host);
+
#endif /* __DRIVERS_MMC_ATMEL_MCI_H__ */
diff --git a/drivers/mci/atmel_mci.c b/drivers/mci/atmel_mci.c
index 2d51b0e2bc..e676c1bd5c 100644
--- a/drivers/mci/atmel_mci.c
+++ b/drivers/mci/atmel_mci.c
@@ -7,460 +7,28 @@
/* Atmel MCI driver */
#include <common.h>
-#include <init.h>
-#include <mci.h>
-#include <errno.h>
-#include <clock.h>
#include <gpio.h>
-#include <io.h>
#include <linux/clk.h>
-#include <linux/err.h>
-#include <platform_data/atmel-mci.h>
+#include <mci.h>
#include <of_gpio.h>
+#include <platform_data/atmel-mci.h>
#include "atmel-mci-regs.h"
-struct atmel_mci_caps {
- bool has_cfg_reg;
- bool has_highspeed;
- bool has_rwproof;
- bool has_odd_clk_div;
- bool need_reset_after_xfer;
-};
-
-struct atmel_mci {
- struct mci_host mci;
- void __iomem *regs;
- struct device_d *hw_dev;
- struct clk *clk;
-
- u32 datasize;
- struct mci_cmd *cmd;
- struct mci_data *data;
- unsigned slot_b;
- int version;
- struct atmel_mci_caps caps;
-
- unsigned long bus_hz;
- u32 mode_reg;
- u32 cfg_reg;
- u32 sdc_reg;
- bool need_reset;
- int detect_pin;
-};
-
-#define to_mci_host(mci) container_of(mci, struct atmel_mci, mci)
-
-#define STATUS_ERROR_MASK (ATMCI_RINDE \
- | ATMCI_RDIRE \
- | ATMCI_RCRCE \
- | ATMCI_RENDE \
- | ATMCI_RTOE \
- | ATMCI_DCRCE \
- | ATMCI_DTOE \
- | ATMCI_OVRE \
- | ATMCI_UNRE)
-
-static void atmci_set_clk_rate(struct atmel_mci *host,
- unsigned int clock_min)
-{
- unsigned int clkdiv;
-
- if (!host->mode_reg) {
- clk_enable(host->clk);
- atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
- if (host->caps.has_cfg_reg)
- atmci_writel(host, ATMCI_CFG, host->cfg_reg);
- }
-
- if (host->caps.has_odd_clk_div) {
- clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
- if (clkdiv > 511) {
- dev_dbg(host->hw_dev,
- "clock %u too slow; using %lu\n",
- clock_min, host->bus_hz / (511 + 2));
- clkdiv = 511;
- }
- host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
- | ATMCI_MR_CLKODD(clkdiv & 1);
- } else {
- clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
- if (clkdiv > 255) {
- dev_dbg(host->hw_dev,
- "clock %u too slow; using %lu\n",
- clock_min, host->bus_hz / (2 * 256));
- clkdiv = 255;
- }
- host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
- }
-
- dev_dbg(host->hw_dev, "atmel_set_clk_rate: clkIn=%ld clkIos=%d divider=%d\n",
- host->bus_hz, clock_min, clkdiv);
-
- /*
- * WRPROOF and RDPROOF prevent overruns/underruns by
- * stopping the clock when the FIFO is full/empty.
- * This state is not expected to last for long.
- */
- if (host->caps.has_rwproof)
- host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF;
-
- atmci_writel(host, ATMCI_MR, host->mode_reg);
-}
-
-static int atmci_poll_status(struct atmel_mci *host, u32 mask)
-{
- u32 stat;
- uint64_t start = get_time_ns();
-
- do {
- stat = atmci_readl(host, ATMCI_SR);
- if (stat & STATUS_ERROR_MASK)
- return stat;
- if (is_timeout(start, SECOND)) {
- dev_err(host->hw_dev, "timeout\n");
- host->need_reset = true;
- return ATMCI_RTOE | stat;
- }
- if (stat & mask)
- return 0;
- } while (1);
-}
-
-static int atmci_pull(struct atmel_mci *host, void *_buf, int bytes)
-{
- unsigned int stat;
- u32 *buf = _buf;
-
- while (bytes > 3) {
- stat = atmci_poll_status(host, ATMCI_RXRDY);
- if (stat)
- return stat;
-
- *buf++ = atmci_readl(host, ATMCI_RDR);
- bytes -= 4;
- }
-
- if (WARN_ON(bytes))
- return -EIO;
-
- return 0;
-}
-
-#ifdef CONFIG_MCI_WRITE
-static int atmci_push(struct atmel_mci *host, const void *_buf, int bytes)
-{
- unsigned int stat;
- const u32 *buf = _buf;
-
- while (bytes > 3) {
- stat = atmci_poll_status(host, ATMCI_TXRDY);
- if (stat)
- return stat;
-
- atmci_writel(host, ATMCI_TDR, *buf++);
- bytes -= 4;
- }
-
- stat = atmci_poll_status(host, ATMCI_TXRDY);
- if (stat)
- return stat;
-
- if (WARN_ON(bytes))
- return -EIO;
-
- return 0;
-}
-#endif /* CONFIG_MCI_WRITE */
-
-static int atmci_transfer_data(struct atmel_mci *host)
-{
- struct mci_data *data = host->data;
- int stat;
- unsigned long length;
-
- length = data->blocks * data->blocksize;
- host->datasize = 0;
-
- if (data->flags & MMC_DATA_READ) {
- stat = atmci_pull(host, data->dest, length);
- if (stat)
- return stat;
-
- stat = atmci_poll_status(host, ATMCI_NOTBUSY);
- if (stat)
- return stat;
-
- host->datasize += length;
- } else {
-#ifdef CONFIG_MCI_WRITE
- stat = atmci_push(host, (const void *)(data->src), length);
- if (stat)
- return stat;
-
- host->datasize += length;
- stat = atmci_poll_status(host, ATMCI_NOTBUSY);
- if (stat)
- return stat;
-#endif /* CONFIG_MCI_WRITE */
- }
- return 0;
-}
-
-static void atmci_finish_request(struct atmel_mci *host)
-{
- host->cmd = NULL;
- host->data = NULL;
-}
-
-static int atmci_finish_data(struct atmel_mci *host, unsigned int stat)
-{
- int data_error = 0;
-
- if (stat & STATUS_ERROR_MASK) {
- dev_err(host->hw_dev, "request failed (status=0x%08x)\n", stat);
- if (stat & ATMCI_DCRCE)
- data_error = -EILSEQ;
- else if (stat & (ATMCI_RTOE | ATMCI_DTOE))
- data_error = -ETIMEDOUT;
- else
- data_error = -EIO;
- }
-
- host->data = NULL;
-
- return data_error;
-}
-
-static void atmci_setup_data(struct atmel_mci *host, struct mci_data *data)
-{
- unsigned int nob = data->blocks;
- unsigned int blksz = data->blocksize;
- unsigned int datasize = nob * blksz;
-
- BUG_ON(data->blocksize & 3);
- BUG_ON(nob == 0);
-
- host->data = data;
-
- dev_dbg(host->hw_dev, "atmel_setup_data: nob=%d blksz=%d\n",
- nob, blksz);
-
- atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(nob)
- | ATMCI_BLKLEN(blksz));
-
- host->datasize = datasize;
-}
-
-static int atmci_read_response(struct atmel_mci *host, unsigned int stat)
-{
- struct mci_cmd *cmd = host->cmd;
- int i;
- u32 *resp;
-
- if (!cmd)
- return 0;
-
- resp = (u32 *)cmd->response;
-
- if (stat & (ATMCI_RTOE | ATMCI_DTOE)) {
- dev_err(host->hw_dev, "command/data timeout\n");
- return -ETIMEDOUT;
- } else if ((stat & ATMCI_RCRCE) && (cmd->resp_type & MMC_RSP_CRC)) {
- dev_err(host->hw_dev, "cmd crc error\n");
- return -EILSEQ;
- }
-
- if (cmd->resp_type & MMC_RSP_PRESENT) {
- if (cmd->resp_type & MMC_RSP_136) {
- for (i = 0; i < 4; i++)
- resp[i] = atmci_readl(host, ATMCI_RSPR);
- } else {
- resp[0] = atmci_readl(host, ATMCI_RSPR);
- }
- }
-
- return 0;
-}
-
-static int atmci_cmd_done(struct atmel_mci *host, unsigned int stat)
-{
- int datastat;
- int ret;
-
- ret = atmci_read_response(host, stat);
-
- if (ret) {
- atmci_finish_request(host);
- return ret;
- }
-
- if (!host->data) {
- atmci_finish_request(host);
- return 0;
- }
-
- datastat = atmci_transfer_data(host);
- ret = atmci_finish_data(host, datastat);
- atmci_finish_request(host);
- return ret;
-}
-
-static int atmci_start_cmd(struct atmel_mci *host, struct mci_cmd *cmd,
- unsigned int cmdat)
-{
- unsigned flags = 0;
- unsigned cmdval = 0;
-
- if (host->cmd != NULL)
- dev_err(host->hw_dev, "error!\n");
-
- if ((atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY) == 0) {
- dev_err(host->hw_dev, "mci not ready!\n");
- return -EBUSY;
- }
-
- host->cmd = cmd;
- cmdval = ATMCI_CMDR_CMDNB_MASK & cmd->cmdidx;
-
- switch (cmd->resp_type) {
- case MMC_RSP_R1: /* short CRC, OPCODE */
- case MMC_RSP_R1b:/* short CRC, OPCODE, BUSY */
- flags |= ATMCI_CMDR_RSPTYP_48BIT;
- break;
- case MMC_RSP_R2: /* long 136 bit + CRC */
- flags |= ATMCI_CMDR_RSPTYP_136BIT;
- break;
- case MMC_RSP_R3: /* short */
- flags |= ATMCI_CMDR_RSPTYP_48BIT;
- break;
- case MMC_RSP_NONE:
- flags |= ATMCI_CMDR_RSPTYP_NONE;
- break;
- default:
- dev_err(host->hw_dev, "unhandled response type 0x%x\n",
- cmd->resp_type);
- return -EINVAL;
- }
- cmdval |= ATMCI_CMDR_RSPTYP & flags;
- cmdval |= cmdat & ~(ATMCI_CMDR_CMDNB_MASK | ATMCI_CMDR_RSPTYP);
-
- atmci_writel(host, ATMCI_ARGR, cmd->cmdarg);
- atmci_writel(host, ATMCI_CMDR, cmdval);
-
- return 0;
-}
-
-static int atmci_card_present(struct mci_host *mci)
-{
- struct atmel_mci *host = to_mci_host(mci);
- int ret;
-
- /* No gpio, assume card is present */
- if (!gpio_is_valid(host->detect_pin))
- return 1;
-
- ret = gpio_get_value(host->detect_pin);
-
- return ret == 0 ? 1 : 0;
-}
-
-/** init the host interface */
-static int atmci_reset(struct mci_host *mci, struct device_d *mci_dev)
-{
- struct atmel_mci *host = to_mci_host(mci);
-
- clk_enable(host->clk);
- atmci_writel(host, ATMCI_DTOR, 0x7f);
- clk_disable(host->clk);
-
- return 0;
-}
-
/** change host interface settings */
static void atmci_set_ios(struct mci_host *mci, struct mci_ios *ios)
{
struct atmel_mci *host = to_mci_host(mci);
- dev_dbg(host->hw_dev, "atmel_mci_set_ios: bus_width=%d clk=%d\n",
- ios->bus_width, ios->clock);
-
- host->sdc_reg &= ~ATMCI_SDCBUS_MASK;
- switch (ios->bus_width) {
- case MMC_BUS_WIDTH_4:
- host->sdc_reg |= ATMCI_SDCBUS_4BIT;
- break;
- case MMC_BUS_WIDTH_8:
- host->sdc_reg |= ATMCI_SDCBUS_8BIT;
- break;
- case MMC_BUS_WIDTH_1:
- host->sdc_reg |= ATMCI_SDCBUS_1BIT;
- break;
- default:
- return;
- }
-
- if (ios->clock) {
- atmci_set_clk_rate(host, ios->clock);
-
- if (host->caps.has_cfg_reg) {
- /* setup High Speed mode in relation with card capacity */
- if (ios->timing == MMC_TIMING_SD_HS)
- host->cfg_reg |= ATMCI_CFG_HSMODE;
- else
- host->cfg_reg &= ~ATMCI_CFG_HSMODE;
-
- atmci_writel(host, ATMCI_CFG, host->cfg_reg);
- }
- } else {
- atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
- if (host->mode_reg) {
- atmci_readl(host, ATMCI_MR);
- clk_disable(host->clk);
- }
- host->mode_reg = 0;
- }
-
- return;
+ atmci_common_set_ios(host, ios);
}
-/** handle a command */
-static int atmci_request(struct mci_host *mci, struct mci_cmd *cmd, struct mci_data *data)
+static int atmci_send_cmd(struct mci_host *mci, struct mci_cmd *cmd,
+ struct mci_data *data)
{
struct atmel_mci *host = to_mci_host(mci);
- u32 stat, cmdat = 0;
- int ret;
-
- if (host->need_reset || host->caps.need_reset_after_xfer) {
- atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
- atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
- atmci_writel(host, ATMCI_MR, host->mode_reg);
- if (host->caps.has_cfg_reg)
- atmci_writel(host, ATMCI_CFG, host->cfg_reg);
- host->need_reset = false;
- }
- atmci_writel(host, ATMCI_SDCR, host->sdc_reg);
- if (cmd->resp_type != MMC_RSP_NONE)
- cmdat |= ATMCI_CMDR_MAXLAT_64CYC;
-
- if (data) {
- atmci_setup_data(host, data);
-
- cmdat |= ATMCI_CMDR_START_XFER | ATMCI_CMDR_MULTI_BLOCK;
-
- if (data->flags & MMC_DATA_READ)
- cmdat |= ATMCI_CMDR_TRDIR_READ;
- }
-
- ret = atmci_start_cmd(host, cmd, cmdat);
- if (ret) {
- atmci_finish_request(host);
- return ret;
- }
-
- stat = atmci_poll_status(host, ATMCI_CMDRDY);
- return atmci_cmd_done(host, stat);
+ return atmci_common_request(host, cmd, data);
}
static void atmci_info(struct device_d *mci_dev)
@@ -484,43 +52,19 @@ static void atmci_info(struct device_d *mci_dev)
gpio_is_valid(host->detect_pin) ? "yes" : "no");
}
-/*
- * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
- * HSMCI provides DMA support and a new config register but no more supports
- * PDC.
- */
-static void atmci_get_cap(struct atmel_mci *host)
+
+static int atmci_card_present(struct mci_host *mci)
{
- unsigned int version;
-
- version = atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
- host->version = version;
-
- dev_info(host->hw_dev, "version: 0x%x\n", version);
-
- host->caps.has_cfg_reg = 0;
- host->caps.has_highspeed = 0;
- host->caps.need_reset_after_xfer = 1;
-
- switch (version & 0xf00) {
- case 0x600:
- case 0x500:
- host->caps.has_odd_clk_div = 1;
- case 0x400:
- case 0x300:
- host->caps.has_cfg_reg = 1;
- host->caps.has_highspeed = 1;
- case 0x200:
- host->caps.has_rwproof = 1;
- case 0x100:
- host->caps.need_reset_after_xfer = 0;
- case 0x0:
- break;
- default:
- dev_warn(host->hw_dev,
- "Unmanaged mci version, set minimum capabilities\n");
- break;
- }
+ struct atmel_mci *host = to_mci_host(mci);
+ int ret;
+
+ /* No gpio, assume card is present */
+ if (!gpio_is_valid(host->detect_pin))
+ return 1;
+
+ ret = gpio_get_value(host->detect_pin);
+
+ return ret == 0 ? 1 : 0;
}
static int atmci_probe(struct device_d *hw_dev)
@@ -532,7 +76,7 @@ static int atmci_probe(struct device_d *hw_dev)
int ret;
host = xzalloc(sizeof(*host));
- host->mci.send_cmd = atmci_request;
+ host->mci.send_cmd = atmci_send_cmd;
host->mci.set_ios = atmci_set_ios;
host->mci.init = atmci_reset;
host->mci.card_present = atmci_card_present;
diff --git a/drivers/mci/atmel_mci_common.c b/drivers/mci/atmel_mci_common.c
new file mode 100644
index 0000000000..5c9e6f9c4d
--- /dev/null
+++ b/drivers/mci/atmel_mci_common.c
@@ -0,0 +1,465 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: 2011 Hubert Feurstein <h.feurstein at gmail.com>
+// SPDX-FileCopyrightText: 2009 Ilya Yanok <yanok at emcraft.com>
+// SPDX-FileCopyrightText: 2008 Sascha Hauer <s.hauer at pengutronix.de>, Pengutronix
+// SPDX-FileCopyrightText: 2006 Pavel Pisa <ppisa at pikron.com>, PiKRON
+
+#include <common.h>
+#include <init.h>
+#include <linux/clk.h>
+#include <linux/iopoll.h>
+#include <mci.h>
+
+#include "atmel-mci-regs.h"
+
+#ifdef __PBL__
+#define udelay early_udelay
+#undef dev_err
+#define dev_err(d, ...) pr_err(__VA_ARGS__)
+#undef dev_warn
+#define dev_warn(d, ...) pr_warn(__VA_ARGS__)
+#undef dev_dbg
+#define dev_dbg(d, ...) pr_debug(__VA_ARGS__)
+#undef dev_info
+#define dev_info(d, ...) pr_info(__VA_ARGS__)
+#undef clk_enable
+#define clk_enable(...)
+#undef clk_disable
+#define clk_disable(...)
+#endif
+
+#define STATUS_ERROR_MASK (ATMCI_RINDE \
+ | ATMCI_RDIRE \
+ | ATMCI_RCRCE \
+ | ATMCI_RENDE \
+ | ATMCI_RTOE \
+ | ATMCI_DCRCE \
+ | ATMCI_DTOE \
+ | ATMCI_OVRE \
+ | ATMCI_UNRE)
+
+static void atmci_set_clk_rate(struct atmel_mci *host,
+ unsigned int clock_min)
+{
+ unsigned int clkdiv;
+
+ if (!host->mode_reg) {
+ clk_enable(host->clk);
+ atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
+ if (host->caps.has_cfg_reg)
+ atmci_writel(host, ATMCI_CFG, host->cfg_reg);
+ }
+
+ if (host->caps.has_odd_clk_div) {
+ clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
+ if (clkdiv > 511) {
+ dev_dbg(host->hw_dev,
+ "clock %u too slow; using %lu\n",
+ clock_min, host->bus_hz / (511 + 2));
+ clkdiv = 511;
+ }
+ host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
+ | ATMCI_MR_CLKODD(clkdiv & 1);
+ } else {
+ clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
+ if (clkdiv > 255) {
+ dev_dbg(host->hw_dev,
+ "clock %u too slow; using %lu\n",
+ clock_min, host->bus_hz / (2 * 256));
+ clkdiv = 255;
+ }
+ host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
+ }
+
+ dev_dbg(host->hw_dev, "atmel_set_clk_rate: clkIn=%ld clkIos=%d divider=%d\n",
+ host->bus_hz, clock_min, clkdiv);
+
+ /*
+ * WRPROOF and RDPROOF prevent overruns/underruns by
+ * stopping the clock when the FIFO is full/empty.
+ * This state is not expected to last for long.
+ */
+ if (host->caps.has_rwproof)
+ host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF;
+
+ atmci_writel(host, ATMCI_MR, host->mode_reg);
+}
+
+static int atmci_poll_status(struct atmel_mci *host, u32 mask)
+{
+ u32 stat;
+ int ret;
+
+ ret = read_poll_timeout(atmci_readl, stat, (stat & mask), SECOND, host,
+ ATMCI_SR);
+ if (ret < 0) {
+ dev_err(host->hw_dev, "timeout\n");
+ host->need_reset = true;
+ return ATMCI_RTOE | stat;
+ }
+
+ if (stat & STATUS_ERROR_MASK)
+ return stat;
+
+ return 0;
+}
+
+static int atmci_pull(struct atmel_mci *host, void *_buf, int bytes)
+{
+ unsigned int stat;
+ u32 *buf = _buf;
+
+ while (bytes > 3) {
+ stat = atmci_poll_status(host, ATMCI_RXRDY);
+ if (stat)
+ return stat;
+
+ *buf++ = atmci_readl(host, ATMCI_RDR);
+ bytes -= 4;
+ }
+
+ if (WARN_ON(bytes))
+ return -EIO;
+
+ return 0;
+}
+
+#ifdef CONFIG_MCI_WRITE
+static int atmci_push(struct atmel_mci *host, const void *_buf, int bytes)
+{
+ unsigned int stat;
+ const u32 *buf = _buf;
+
+ while (bytes > 3) {
+ stat = atmci_poll_status(host, ATMCI_TXRDY);
+ if (stat)
+ return stat;
+
+ atmci_writel(host, ATMCI_TDR, *buf++);
+ bytes -= 4;
+ }
+
+ stat = atmci_poll_status(host, ATMCI_TXRDY);
+ if (stat)
+ return stat;
+
+ if (WARN_ON(bytes))
+ return -EIO;
+
+ return 0;
+}
+#endif /* CONFIG_MCI_WRITE */
+
+static int atmci_transfer_data(struct atmel_mci *host)
+{
+ struct mci_data *data = host->data;
+ int stat;
+ unsigned long length;
+
+ length = data->blocks * data->blocksize;
+ host->datasize = 0;
+
+ if (data->flags & MMC_DATA_READ) {
+ stat = atmci_pull(host, data->dest, length);
+ if (stat)
+ return stat;
+
+ stat = atmci_poll_status(host, ATMCI_NOTBUSY);
+ if (stat)
+ return stat;
+
+ host->datasize += length;
+ } else {
+#ifdef CONFIG_MCI_WRITE
+ stat = atmci_push(host, (const void *)(data->src), length);
+ if (stat)
+ return stat;
+
+ host->datasize += length;
+ stat = atmci_poll_status(host, ATMCI_NOTBUSY);
+ if (stat)
+ return stat;
+#endif /* CONFIG_MCI_WRITE */
+ }
+ return 0;
+}
+
+static void atmci_finish_request(struct atmel_mci *host)
+{
+ host->cmd = NULL;
+ host->data = NULL;
+}
+
+static int atmci_finish_data(struct atmel_mci *host, unsigned int stat)
+{
+ int data_error = 0;
+
+ if (stat & STATUS_ERROR_MASK) {
+ dev_err(host->hw_dev, "request failed (status=0x%08x)\n", stat);
+ if (stat & ATMCI_DCRCE)
+ data_error = -EILSEQ;
+ else if (stat & (ATMCI_RTOE | ATMCI_DTOE))
+ data_error = -ETIMEDOUT;
+ else
+ data_error = -EIO;
+ }
+
+ host->data = NULL;
+
+ return data_error;
+}
+
+static void atmci_setup_data(struct atmel_mci *host, struct mci_data *data)
+{
+ unsigned int nob = data->blocks;
+ unsigned int blksz = data->blocksize;
+ unsigned int datasize = nob * blksz;
+
+ BUG_ON(data->blocksize & 3);
+ BUG_ON(nob == 0);
+
+ host->data = data;
+
+ dev_dbg(host->hw_dev, "atmel_setup_data: nob=%d blksz=%d\n",
+ nob, blksz);
+
+ atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(nob)
+ | ATMCI_BLKLEN(blksz));
+
+ host->datasize = datasize;
+}
+
+static int atmci_read_response(struct atmel_mci *host, unsigned int stat)
+{
+ struct mci_cmd *cmd = host->cmd;
+ int i;
+ u32 *resp;
+
+ if (!cmd)
+ return 0;
+
+ resp = (u32 *)cmd->response;
+
+ if (stat & (ATMCI_RTOE | ATMCI_DTOE)) {
+ dev_err(host->hw_dev, "command/data timeout\n");
+ return -ETIMEDOUT;
+ } else if ((stat & ATMCI_RCRCE) && (cmd->resp_type & MMC_RSP_CRC)) {
+ dev_err(host->hw_dev, "cmd crc error\n");
+ return -EILSEQ;
+ }
+
+ if (cmd->resp_type & MMC_RSP_PRESENT) {
+ if (cmd->resp_type & MMC_RSP_136) {
+ for (i = 0; i < 4; i++)
+ resp[i] = atmci_readl(host, ATMCI_RSPR);
+ } else {
+ resp[0] = atmci_readl(host, ATMCI_RSPR);
+ }
+ }
+
+ return 0;
+}
+
+static int atmci_cmd_done(struct atmel_mci *host, unsigned int stat)
+{
+ int datastat;
+ int ret;
+
+ ret = atmci_read_response(host, stat);
+
+ if (ret) {
+ atmci_finish_request(host);
+ return ret;
+ }
+
+ if (!host->data) {
+ atmci_finish_request(host);
+ return 0;
+ }
+
+ datastat = atmci_transfer_data(host);
+ ret = atmci_finish_data(host, datastat);
+ atmci_finish_request(host);
+ return ret;
+}
+
+static int atmci_start_cmd(struct atmel_mci *host, struct mci_cmd *cmd,
+ unsigned int cmdat)
+{
+ unsigned flags = 0;
+ unsigned cmdval = 0;
+
+ if (host->cmd != NULL)
+ dev_err(host->hw_dev, "error!\n");
+
+ if ((atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY) == 0) {
+ dev_err(host->hw_dev, "mci not ready!\n");
+ return -EBUSY;
+ }
+
+ host->cmd = cmd;
+ cmdval = ATMCI_CMDR_CMDNB_MASK & cmd->cmdidx;
+
+ switch (cmd->resp_type) {
+ case MMC_RSP_R1: /* short CRC, OPCODE */
+ case MMC_RSP_R1b:/* short CRC, OPCODE, BUSY */
+ flags |= ATMCI_CMDR_RSPTYP_48BIT;
+ break;
+ case MMC_RSP_R2: /* long 136 bit + CRC */
+ flags |= ATMCI_CMDR_RSPTYP_136BIT;
+ break;
+ case MMC_RSP_R3: /* short */
+ flags |= ATMCI_CMDR_RSPTYP_48BIT;
+ break;
+ case MMC_RSP_NONE:
+ flags |= ATMCI_CMDR_RSPTYP_NONE;
+ break;
+ default:
+ dev_err(host->hw_dev, "unhandled response type 0x%x\n",
+ cmd->resp_type);
+ return -EINVAL;
+ }
+ cmdval |= ATMCI_CMDR_RSPTYP & flags;
+ cmdval |= cmdat & ~(ATMCI_CMDR_CMDNB_MASK | ATMCI_CMDR_RSPTYP);
+
+ atmci_writel(host, ATMCI_ARGR, cmd->cmdarg);
+ atmci_writel(host, ATMCI_CMDR, cmdval);
+
+ return 0;
+}
+
+/** init the host interface */
+int atmci_reset(struct mci_host *mci, struct device_d *mci_dev)
+{
+ struct atmel_mci *host = to_mci_host(mci);
+
+ clk_enable(host->clk);
+ atmci_writel(host, ATMCI_DTOR, 0x7f);
+ clk_disable(host->clk);
+
+ return 0;
+}
+
+/** change host interface settings */
+void atmci_common_set_ios(struct atmel_mci *host, struct mci_ios *ios)
+{
+ dev_dbg(host->hw_dev, "atmel_mci_set_ios: bus_width=%d clk=%d\n",
+ ios->bus_width, ios->clock);
+
+ host->sdc_reg &= ~ATMCI_SDCBUS_MASK;
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_4:
+ host->sdc_reg |= ATMCI_SDCBUS_4BIT;
+ break;
+ case MMC_BUS_WIDTH_8:
+ host->sdc_reg |= ATMCI_SDCBUS_8BIT;
+ break;
+ case MMC_BUS_WIDTH_1:
+ host->sdc_reg |= ATMCI_SDCBUS_1BIT;
+ break;
+ default:
+ return;
+ }
+
+ if (ios->clock) {
+ atmci_set_clk_rate(host, ios->clock);
+
+ if (host->caps.has_cfg_reg) {
+ /* setup High Speed mode in relation with card capacity */
+ if (ios->timing == MMC_TIMING_SD_HS)
+ host->cfg_reg |= ATMCI_CFG_HSMODE;
+ else
+ host->cfg_reg &= ~ATMCI_CFG_HSMODE;
+
+ atmci_writel(host, ATMCI_CFG, host->cfg_reg);
+ }
+ } else {
+ atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
+ if (host->mode_reg) {
+ atmci_readl(host, ATMCI_MR);
+ clk_disable(host->clk);
+ }
+ host->mode_reg = 0;
+ }
+
+ return;
+}
+
+/** handle a command */
+int atmci_common_request(struct atmel_mci *host, struct mci_cmd *cmd,
+ struct mci_data *data)
+{
+ u32 stat, cmdat = 0;
+ int ret;
+
+ if (host->need_reset || host->caps.need_reset_after_xfer) {
+ atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
+ atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
+ atmci_writel(host, ATMCI_MR, host->mode_reg);
+ if (host->caps.has_cfg_reg)
+ atmci_writel(host, ATMCI_CFG, host->cfg_reg);
+ host->need_reset = false;
+ }
+ atmci_writel(host, ATMCI_SDCR, host->sdc_reg);
+
+ if (cmd->resp_type != MMC_RSP_NONE)
+ cmdat |= ATMCI_CMDR_MAXLAT_64CYC;
+
+ if (data) {
+ atmci_setup_data(host, data);
+
+ cmdat |= ATMCI_CMDR_START_XFER | ATMCI_CMDR_MULTI_BLOCK;
+
+ if (data->flags & MMC_DATA_READ)
+ cmdat |= ATMCI_CMDR_TRDIR_READ;
+ }
+
+ ret = atmci_start_cmd(host, cmd, cmdat);
+ if (ret) {
+ atmci_finish_request(host);
+ return ret;
+ }
+
+ stat = atmci_poll_status(host, ATMCI_CMDRDY);
+ return atmci_cmd_done(host, stat);
+}
+
+
+/*
+ * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
+ * HSMCI provides DMA support and a new config register but no more supports
+ * PDC.
+ */
+void atmci_get_cap(struct atmel_mci *host)
+{
+ unsigned int version;
+
+ version = atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
+ host->version = version;
+
+ dev_info(host->hw_dev, "version: 0x%x\n", version);
+
+ host->caps.has_cfg_reg = 0;
+ host->caps.has_highspeed = 0;
+ host->caps.need_reset_after_xfer = 1;
+
+ switch (version & 0xf00) {
+ case 0x600:
+ case 0x500:
+ host->caps.has_odd_clk_div = 1;
+ case 0x400:
+ case 0x300:
+ host->caps.has_cfg_reg = 1;
+ host->caps.has_highspeed = 1;
+ case 0x200:
+ host->caps.has_rwproof = 1;
+ case 0x100:
+ host->caps.need_reset_after_xfer = 0;
+ case 0x0:
+ break;
+ default:
+ dev_warn(host->hw_dev,
+ "Unmanaged mci version, set minimum capabilities\n");
+ break;
+ }
+}
diff --git a/drivers/mci/atmel_mci_pbl.c b/drivers/mci/atmel_mci_pbl.c
new file mode 100644
index 0000000000..ff37dba7ea
--- /dev/null
+++ b/drivers/mci/atmel_mci_pbl.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <common.h>
+#include <mach/xload.h>
+#include <mci.h>
+
+#include "atmel-mci-regs.h"
+
+#define SECTOR_SIZE 512
+#define SUPPORT_MAX_BLOCKS 16U
+
+struct atmel_mci_priv {
+ struct atmel_mci host;
+ bool highcapacity_card;
+};
+
+static struct atmel_mci_priv atmci_sdcard;
+
+static int atmel_mci_pbl_stop_transmission(struct atmel_mci_priv *priv)
+{
+ struct mci_cmd cmd = {
+ .cmdidx = MMC_CMD_STOP_TRANSMISSION,
+ .resp_type = MMC_RSP_R1b,
+ };
+
+ return atmci_common_request(&priv->host, &cmd, NULL);
+}
+
+static int at91_mci_sd_cmd_read_multiple_block(struct atmel_mci_priv *priv,
+ void *buf,
+ unsigned int start,
+ unsigned int block_count)
+{
+ u16 block_len = SECTOR_SIZE;
+ struct mci_data data;
+ struct mci_cmd cmd = {
+ .cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK,
+ .resp_type = MMC_RSP_R1,
+ .cmdarg = start,
+ };
+
+ if (!priv->highcapacity_card)
+ cmd.cmdarg *= block_len;
+
+ data.dest = buf;
+ data.flags = MMC_DATA_READ;
+ data.blocksize = block_len;
+ data.blocks = block_count;
+
+ return atmci_common_request(&priv->host, &cmd, &data);
+}
+
+static int at91_mci_bio_read(struct pbl_bio *bio, off_t start,
+ void *buf, unsigned int nblocks)
+{
+ struct atmel_mci_priv *priv = bio->priv;
+ unsigned int blocks_done = 0;
+ unsigned int blocks;
+ unsigned int block_len = SECTOR_SIZE;
+ unsigned int blocks_read;
+ int ret;
+
+ while (blocks_done < nblocks) {
+ blocks = min(nblocks - blocks_done, SUPPORT_MAX_BLOCKS);
+
+ blocks_read = at91_mci_sd_cmd_read_multiple_block(priv, buf,
+ start + blocks_done,
+ blocks);
+
+ ret = atmel_mci_pbl_stop_transmission(priv);
+ if (ret)
+ return ret;
+
+ blocks_done += blocks_read;
+
+ if (blocks_read != blocks)
+ break;
+
+ buf += blocks * block_len;
+ }
+
+ return blocks_done;
+}
+
+int at91_mci_bio_init(struct pbl_bio *bio, void __iomem *base,
+ unsigned int clock, unsigned int slot)
+{
+ struct atmel_mci_priv *priv = &atmci_sdcard;
+ struct atmel_mci *host = &priv->host;
+ struct mci_ios ios = { .bus_width = MMC_BUS_WIDTH_4, .clock = 25000000 };
+
+ bio->priv = priv;
+ bio->read = at91_mci_bio_read;
+
+ host->regs = base;
+
+ atmci_get_cap(host);
+
+ /* get real HZ */
+ host->bus_hz = clock;
+
+ host->slot_b = slot;
+ if (host->slot_b)
+ host->sdc_reg = ATMCI_SDCSEL_SLOT_B;
+ else
+ host->sdc_reg = ATMCI_SDCSEL_SLOT_A;
+
+ atmci_writel(host, ATMCI_DTOR, 0x7f);
+
+ atmci_common_set_ios(host, &ios);
+
+ priv->highcapacity_card = 1;
+
+ return 0;
+}
--
2.29.2
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