[PATCH v4] mmc: OCTEON: Add host driver for OCTEON MMC controller

Aleksey Makarov
2015-03-16T15:06:00Z

The OCTEON MMC controller is currently found on cn61XX and cnf71XX
devices. Device parameters are configured from device tree data.

eMMC, MMC and SD devices are supported.

Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Chandrakala Chavva <cchavva@caviumnetworks.com>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Signed-off-by: Leonid Rosenboim <lrosenboim@caviumnetworks.com>
Signed-off-by: Peter Swain <pswain@cavium.com>
Signed-off-by: Aaron Williams <aaron.williams@cavium.com>
---
.../devicetree/bindings/mmc/octeon-mmc.txt | 69 +
drivers/mmc/host/Kconfig | 10 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/octeon_mmc.c | 1415 ++++++++++++++++++++
4 files changed, 1495 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mmc/octeon-mmc.txt
create mode 100644 drivers/mmc/host/octeon_mmc.c

This patch should be applied on top of the patchset
"MIPS: OCTEON: flash: syncronize bootbus access"
https://lkml.kernel.org/g/<1425565893-30614-1-git-send-email-aleksey.makarov@auriga.com>

v3:
https://lkml.kernel.org/g/<1425567033-31236-1-git-send-email-aleksey.makarov@auriga.com>

Changes in v4:
- The sparse error discovered by Aaro Koskinen has been fixed
- Other sparse warnings have been silenced

Changes in v3:
- Rebased to v4.0-rc2
- Use gpiod_*() functions instead of legacy gpio
- Cosmetic changes

Changes in v2: All the fixes suggested by Mark Rutland were implemented:
- Device tree parsing has been fixed
- Device tree docs have been fixed
- Comment about errata workaroud has been added

diff --git a/Documentation/devicetree/bindings/mmc/octeon-mmc.txt b/Documentation/devicetree/bindings/mmc/octeon-mmc.txt
new file mode 100644
index 0000000..40dd7f1
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/octeon-mmc.txt
@@ -0,0 +1,69 @@
+* OCTEON SD/MMC Host Controller
+
+This controller is present on some members of the Cavium OCTEON SoC
+family, provide an interface for eMMC, MMC and SD devices. There is a
+single controller that may have several "slots" connected. These
+slots appear as children of the main controller node.
+The DMA engine is an integral part of the controller block.
+
+Required properties:
+- compatible : Should be "cavium,octeon-6130-mmc" or "cavium,octeon-7890-mmc"
+- reg : Two entries:
+ 1) The base address of the MMC controller register bank.
+ 2) The base address of the MMC DMA engine register bank.
+- interrupts :
+ For "cavium,octeon-6130-mmc": two entries:
+ 1) The MMC controller interrupt line.
+ 2) The MMC DMA engine interrupt line.
+ For "cavium,octeon-7890-mmc": nine entries:
+ 1) The next block transfer of a multiblock transfer has completed (BUF_DONE)
+ 2) Operation completed successfully (CMD_DONE).
+ 3) DMA transfer completed successfully (DMA_DONE).
+ 4) Operation encountered an error (CMD_ERR).
+ 5) DMA transfer encountered an error (DMA_ERR).
+ 6) Switch operation completed successfully (SWITCH_DONE).
+ 7) Switch operation encountered an error (SWITCH_ERR).
+ 8) Internal DMA engine request completion interrupt (DONE).
+ 9) Internal DMA FIFO underflow (FIFO).
+- #address-cells : Must be <1>
+- #size-cells : Must be <0>
+
+Required properties of child nodes:
+- compatible : Should be "cavium,octeon-6130-mmc-slot".
+- reg : The slot number.
+
+Optional properties of child nodes:
+- cd-gpios : Specify GPIOs for card detection
+- wp-gpios : Specify GPIOs for write protection
+- power-gpios : Specify GPIOs for power control
+- cavium,bus-max-width : The number of data lines present in the slot.
+ Default is 8.
+- spi-max-frequency : The maximum operating frequency of the slot.
+ Default is 52000000.
+- cavium,cmd-clk-skew : the amount of delay (in pS) past the clock edge
+ to sample the command pin.
+- cavium,dat-clk-skew : the amount of delay (in pS) past the clock edge
+ to sample the data pin.
+
+Example:
+ mmc@1180000002000 {
+ compatible = "cavium,octeon-6130-mmc";
+ reg = <0x11800 0x00002000 0x0 0x100>,
+ <0x11800 0x00000168 0x0 0x20>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ /* EMM irq, DMA irq */
+ interrupts = <1 19>, <0 63>;
+
+ /* The board only has a single MMC slot */
+ mmc-slot@0 {
+ compatible = "cavium,octeon-6130-mmc-slot";
+ reg = <0>;
+ spi-max-frequency = <20000000>;
+ /* bus width can be 1, 4 or 8 */
+ cavium,bus-max-width = <8>;
+ cd-gpios = <&gpio 9 0>;
+ wp-gpios = <&gpio 10 0>;
+ power-gpios = <&gpio 8 0>;
+ };
+ };
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 61ac63a..acf4da0 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -307,6 +307,16 @@ config MMC_SDHCI_F_SDH30

If unsure, say N.

+config MMC_OCTEON
+ tristate "Cavium OCTEON Multimedia Card Interface support"
+ depends on CAVIUM_OCTEON_SOC
+ help
+ This selects Cavium OCTEON Multimedia card Interface.
+ If you have an OCTEON board with a Multimedia Card slot,
+ say Y or M here.
+
+ If unsure, say N.
+
config MMC_MOXART
tristate "MOXART SD/MMC Host Controller support"
depends on ARCH_MOXART && MMC
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 6a7cfe0..ce7d6a0 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_MMC_SDHCI_F_SDH30) += sdhci_f_sdh30.o
obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
obj-$(CONFIG_MMC_WBSD) += wbsd.o
obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
+obj-$(CONFIG_MMC_OCTEON) += octeon_mmc.o
obj-$(CONFIG_MMC_OMAP) += omap.o
obj-$(CONFIG_MMC_OMAP_HS) += omap_hsmmc.o
obj-$(CONFIG_MMC_ATMELMCI) += atmel-mci.o
diff --git a/drivers/mmc/host/octeon_mmc.c b/drivers/mmc/host/octeon_mmc.c
new file mode 100644
index 0000000..a3f10c6
--- /dev/null
+++ b/drivers/mmc/host/octeon_mmc.c
@@ -0,0 +1,1415 @@
+/*
+ * Driver for MMC and SSD cards for Cavium OCTEON SOCs.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2012-2015 Cavium Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/scatterlist.h>
+#include <linux/interrupt.h>
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
+#include <net/irda/parameters.h>
+#include <linux/gpio/consumer.h>
+
+#include <asm/byteorder.h>
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-mio-defs.h>
+
+#define DRV_NAME "octeon_mmc"
+
+#define OCTEON_MAX_MMC 4
+
+#define OCT_MIO_NDF_DMA_CFG 0x00
+#define OCT_MIO_EMM_DMA_ADR 0x08
+
+#define OCT_MIO_EMM_CFG 0x00
+#define OCT_MIO_EMM_SWITCH 0x48
+#define OCT_MIO_EMM_DMA 0x50
+#define OCT_MIO_EMM_CMD 0x58
+#define OCT_MIO_EMM_RSP_STS 0x60
+#define OCT_MIO_EMM_RSP_LO 0x68
+#define OCT_MIO_EMM_RSP_HI 0x70
+#define OCT_MIO_EMM_INT 0x78
+#define OCT_MIO_EMM_INT_EN 0x80
+#define OCT_MIO_EMM_WDOG 0x88
+#define OCT_MIO_EMM_SAMPLE 0x90
+#define OCT_MIO_EMM_STS_MASK 0x98
+#define OCT_MIO_EMM_RCA 0xa0
+#define OCT_MIO_EMM_BUF_IDX 0xe0
+#define OCT_MIO_EMM_BUF_DAT 0xe8
+
+#define CVMX_MIO_BOOT_CTL CVMX_ADD_IO_SEG(0x00011800000000D0ull)
+
+struct octeon_mmc_host {
+ u64 base;
+ u64 ndf_base;
+ u64 emm_cfg;
+ u64 n_minus_one; /* OCTEON II workaround location */
+ int last_slot;
+
+ struct semaphore mmc_serializer;
+ struct mmc_request *current_req;
+ unsigned int linear_buf_size;
+ void *linear_buf;
+ struct sg_mapping_iter smi;
+ int sg_idx;
+ bool dma_active;
+
+ struct platform_device *pdev;
+ struct gpio_desc *global_pwr_gpiod;
+ bool dma_err_pending;
+ bool need_bootbus_lock;
+ bool big_dma_addr;
+ bool need_irq_handler_lock;
+ spinlock_t irq_handler_lock;
+
+ struct octeon_mmc_slot *slot[OCTEON_MAX_MMC];
+};
+
+struct octeon_mmc_slot {
+ struct mmc_host *mmc; /* slot-level mmc_core object */
+ struct octeon_mmc_host *host; /* common hw for all 4 slots */
+
+ unsigned int clock;
+ unsigned int sclock;
+
+ u64 cached_switch;
+ u64 cached_rca;
+
+ unsigned int cmd_cnt; /* sample delay */
+ unsigned int dat_cnt; /* sample delay */
+
+ int bus_width;
+ int bus_id;
+
+ struct gpio_desc *ro_gpiod;
+ struct gpio_desc *cd_gpiod;
+ struct gpio_desc *pwr_gpiod;
+};
+
+static int bb_size = 1 << 18;
+module_param(bb_size, int, S_IRUGO);
+MODULE_PARM_DESC(bb_size,
+ "Size of DMA linearizing buffer (max transfer size).");
+
+static int ddr = 2;
+module_param(ddr, int, S_IRUGO);
+MODULE_PARM_DESC(ddr,
+ "enable DoubleDataRate clocking: 0=no, 1=always, 2=at spi-max-frequency/2");
+
+#if 0
+#define octeon_mmc_dbg trace_printk
+#else
+static inline void octeon_mmc_dbg(const char *s, ...) { }
+#endif
+
+static void octeon_mmc_acquire_bus(struct octeon_mmc_host *host)
+{
+ if (host->need_bootbus_lock) {
+ down(&octeon_bootbus_sem);
+ /* On cn70XX switch the mmc unit onto the bus. */
+ if (OCTEON_IS_MODEL(OCTEON_CN70XX))
+ cvmx_write_csr(CVMX_MIO_BOOT_CTL, 0);
+ } else {
+ down(&host->mmc_serializer);
+ }
+}
+
+static void octeon_mmc_release_bus(struct octeon_mmc_host *host)
+{
+ if (host->need_bootbus_lock)
+ up(&octeon_bootbus_sem);
+ else
+ up(&host->mmc_serializer);
+}
+
+struct octeon_mmc_cr_type {
+ u8 ctype;
+ u8 rtype;
+};
+
+/*
+ * The OCTEON MMC host hardware assumes that all commands have fixed
+ * command and response types. These are correct if MMC devices are
+ * being used. However, non-MMC devices like SD use command and
+ * response types that are unexpected by the host hardware.
+ *
+ * The command and response types can be overridden by supplying an
+ * XOR value that is applied to the type. We calculate the XOR value
+ * from the values in this table and the flags passed from the MMC
+ * core.
+ */
+static struct octeon_mmc_cr_type octeon_mmc_cr_types[] = {
+ {0, 0}, /* CMD0 */
+ {0, 3}, /* CMD1 */
+ {0, 2}, /* CMD2 */
+ {0, 1}, /* CMD3 */
+ {0, 0}, /* CMD4 */
+ {0, 1}, /* CMD5 */
+ {0, 1}, /* CMD6 */
+ {0, 1}, /* CMD7 */
+ {1, 1}, /* CMD8 */
+ {0, 2}, /* CMD9 */
+ {0, 2}, /* CMD10 */
+ {1, 1}, /* CMD11 */
+ {0, 1}, /* CMD12 */
+ {0, 1}, /* CMD13 */
+ {1, 1}, /* CMD14 */
+ {0, 0}, /* CMD15 */
+ {0, 1}, /* CMD16 */
+ {1, 1}, /* CMD17 */
+ {1, 1}, /* CMD18 */
+ {3, 1}, /* CMD19 */
+ {2, 1}, /* CMD20 */
+ {0, 0}, /* CMD21 */
+ {0, 0}, /* CMD22 */
+ {0, 1}, /* CMD23 */
+ {2, 1}, /* CMD24 */
+ {2, 1}, /* CMD25 */
+ {2, 1}, /* CMD26 */
+ {2, 1}, /* CMD27 */
+ {0, 1}, /* CMD28 */
+ {0, 1}, /* CMD29 */
+ {1, 1}, /* CMD30 */
+ {1, 1}, /* CMD31 */
+ {0, 0}, /* CMD32 */
+ {0, 0}, /* CMD33 */
+ {0, 0}, /* CMD34 */
+ {0, 1}, /* CMD35 */
+ {0, 1}, /* CMD36 */
+ {0, 0}, /* CMD37 */
+ {0, 1}, /* CMD38 */
+ {0, 4}, /* CMD39 */
+ {0, 5}, /* CMD40 */
+ {0, 0}, /* CMD41 */
+ {2, 1}, /* CMD42 */
+ {0, 0}, /* CMD43 */
+ {0, 0}, /* CMD44 */
+ {0, 0}, /* CMD45 */
+ {0, 0}, /* CMD46 */
+ {0, 0}, /* CMD47 */
+ {0, 0}, /* CMD48 */
+ {0, 0}, /* CMD49 */
+ {0, 0}, /* CMD50 */
+ {0, 0}, /* CMD51 */
+ {0, 0}, /* CMD52 */
+ {0, 0}, /* CMD53 */
+ {0, 0}, /* CMD54 */
+ {0, 1}, /* CMD55 */
+ {0xff, 0xff}, /* CMD56 */
+ {0, 0}, /* CMD57 */
+ {0, 0}, /* CMD58 */
+ {0, 0}, /* CMD59 */
+ {0, 0}, /* CMD60 */
+ {0, 0}, /* CMD61 */
+ {0, 0}, /* CMD62 */
+ {0, 0} /* CMD63 */
+};
+
+struct octeon_mmc_cr_mods {
+ u8 ctype_xor;
+ u8 rtype_xor;
+};
+
+/*
+ * The functions below are used for the EMMC-17978 workaround.
+ *
+ * Due to an imperfection in the design of the MMC bus hardware,
+ * the 2nd to last cache block of a DMA read must be locked into the L2 Cache.
+ * Otherwise, data corruption may occur.
+ */
+
+static inline void *phys_to_ptr(u64 address)
+{
+ return (void *)(address | (1ull<<63)); /* XKPHYS */
+}
+
+/**
+ * Lock a single line into L2. The line is zeroed before locking
+ * to make sure no dram accesses are made.
+ *
+ * @addr Physical address to lock
+ */
+static void l2c_lock_line(u64 addr)
+{
+ char *addr_ptr = phys_to_ptr(addr);
+
+ asm volatile (
+ "cache 31, %[line]" /* Unlock the line */
+ :: [line] "m" (*addr_ptr));
+}
+
+/**
+ * Locks a memory region in the L2 cache
+ *
+ * @start - start address to begin locking
+ * @len - length in bytes to lock
+ */
+static void l2c_lock_mem_region(u64 start, u64 len)
+{
+ u64 end;
+
+ /* Round start/end to cache line boundaries */
+ end = ALIGN(start + len - 1, CVMX_CACHE_LINE_SIZE);
+ start = ALIGN(start, CVMX_CACHE_LINE_SIZE);
+
+ while (start <= end) {
+ l2c_lock_line(start);
+ start += CVMX_CACHE_LINE_SIZE;
+ }
+ asm volatile("sync");
+}
+
+/**
+ * Unlock a single line in the L2 cache.
+ *
+ * @addr Physical address to unlock
+ *
+ * Return Zero on success
+ */
+static void l2c_unlock_line(u64 addr)
+{
+ char *addr_ptr = phys_to_ptr(addr);
+
+ asm volatile (
+ "cache 23, %[line]" /* Unlock the line */
+ :: [line] "m" (*addr_ptr));
+}
+
+/**
+ * Unlock a memory region in the L2 cache
+ *
+ * @start - start address to unlock
+ * @len - length to unlock in bytes
+ */
+static void l2c_unlock_mem_region(u64 start, u64 len)
+{
+ u64 end;
+
+ /* Round start/end to cache line boundaries */
+ end = ALIGN(start + len - 1, CVMX_CACHE_LINE_SIZE);
+ start = ALIGN(start, CVMX_CACHE_LINE_SIZE);
+
+ while (start <= end) {
+ l2c_unlock_line(start);
+ start += CVMX_CACHE_LINE_SIZE;
+ }
+}
+
+static struct octeon_mmc_cr_mods octeon_mmc_get_cr_mods(struct mmc_command *cmd)
+{
+ struct octeon_mmc_cr_type *cr;
+ u8 desired_ctype, hardware_ctype;
+ u8 desired_rtype, hardware_rtype;
+ struct octeon_mmc_cr_mods r;
+
+ desired_ctype = desired_rtype = 0;
+
+ cr = octeon_mmc_cr_types + (cmd->opcode & 0x3f);
+ hardware_ctype = cr->ctype;
+ hardware_rtype = cr->rtype;
+ if (cmd->opcode == 56) { /* CMD56 GEN_CMD */
+ hardware_ctype = (cmd->arg & 1) ? 1 : 2;
+ }
+
+ switch (mmc_cmd_type(cmd)) {
+ case MMC_CMD_ADTC:
+ desired_ctype = (cmd->data->flags & MMC_DATA_WRITE) ? 2 : 1;
+ break;
+ case MMC_CMD_AC:
+ case MMC_CMD_BC:
+ case MMC_CMD_BCR:
+ desired_ctype = 0;
+ break;
+ }
+
+ switch (mmc_resp_type(cmd)) {
+ case MMC_RSP_NONE:
+ desired_rtype = 0;
+ break;
+ case MMC_RSP_R1:/* MMC_RSP_R5, MMC_RSP_R6, MMC_RSP_R7 */
+ case MMC_RSP_R1B:
+ desired_rtype = 1;
+ break;
+ case MMC_RSP_R2:
+ desired_rtype = 2;
+ break;
+ case MMC_RSP_R3: /* MMC_RSP_R4 */
+ desired_rtype = 3;
+ break;
+ }
+ r.ctype_xor = desired_ctype ^ hardware_ctype;
+ r.rtype_xor = desired_rtype ^ hardware_rtype;
+ return r;
+}
+
+static bool octeon_mmc_switch_val_changed(struct octeon_mmc_slot *slot,
+ u64 new_val)
+{
+ /* Match BUS_ID, HS_TIMING, BUS_WIDTH, POWER_CLASS, CLK_HI, CLK_LO */
+ u64 m = 0x3001070fffffffffull;
+
+ return (slot->cached_switch & m) != (new_val & m);
+}
+
+static unsigned int octeon_mmc_timeout_to_wdog(struct octeon_mmc_slot *slot,
+ unsigned int ns)
+{
+ u64 bt = (u64)slot->clock * (u64)ns;
+
+ return (unsigned int)(bt / 1000000000);
+}
+
+static irqreturn_t octeon_mmc_interrupt(int irq, void *dev_id)
+{
+ struct octeon_mmc_host *host = dev_id;
+ union cvmx_mio_emm_int emm_int;
+ struct mmc_request *req;
+ bool host_done;
+ union cvmx_mio_emm_rsp_sts rsp_sts;
+ unsigned long flags = 0;
+
+ if (host->need_irq_handler_lock)
+ spin_lock_irqsave(&host->irq_handler_lock, flags);
+ else
+ __acquire(&host->irq_handler_lock);
+ emm_int.u64 = cvmx_read_csr(host->base + OCT_MIO_EMM_INT);
+ req = host->current_req;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_INT, emm_int.u64);
+
+ octeon_mmc_dbg("Got interrupt: EMM_INT = 0x%llx\n", emm_int.u64);
+
+ if (!req)
+ goto out;
+
+ rsp_sts.u64 = cvmx_read_csr(host->base + OCT_MIO_EMM_RSP_STS);
+ octeon_mmc_dbg("octeon_mmc_interrupt MIO_EMM_RSP_STS 0x%llx\n",
+ rsp_sts.u64);
+
+ if (host->dma_err_pending) {
+ host->current_req = NULL;
+ host->dma_err_pending = false;
+ req->done(req);
+ host_done = true;
+ goto no_req_done;
+ }
+
+ if (!host->dma_active && emm_int.s.buf_done && req->data) {
+ unsigned int type = (rsp_sts.u64 >> 7) & 3;
+
+ if (type == 1) {
+ /* Read */
+ int dbuf = rsp_sts.s.dbuf;
+ struct sg_mapping_iter *smi = &host->smi;
+ unsigned int data_len =
+ req->data->blksz * req->data->blocks;
+ unsigned int bytes_xfered;
+ u64 dat = 0;
+ int shift = -1;
+
+ /* Auto inc from offset zero */
+ cvmx_write_csr(host->base + OCT_MIO_EMM_BUF_IDX,
+ (u64)(0x10000 | (dbuf << 6)));
+
+ for (bytes_xfered = 0; bytes_xfered < data_len;) {
+ if (smi->consumed >= smi->length) {
+ if (!sg_miter_next(smi))
+ break;
+ smi->consumed = 0;
+ }
+ if (shift < 0) {
+ dat = cvmx_read_csr(host->base +
+ OCT_MIO_EMM_BUF_DAT);
+ shift = 56;
+ }
+
+ while (smi->consumed < smi->length &&
+ shift >= 0) {
+ ((u8 *)(smi->addr))[smi->consumed] =
+ (dat >> shift) & 0xff;
+ bytes_xfered++;
+ smi->consumed++;
+ shift -= 8;
+ }
+ }
+ sg_miter_stop(smi);
+ req->data->bytes_xfered = bytes_xfered;
+ req->data->error = 0;
+ } else if (type == 2) {
+ /* write */
+ req->data->bytes_xfered = req->data->blksz *
+ req->data->blocks;
+ req->data->error = 0;
+ }
+ }
+ host_done = emm_int.s.cmd_done || emm_int.s.dma_done ||
+ emm_int.s.cmd_err || emm_int.s.dma_err;
+ if (host_done && req->done) {
+ if (rsp_sts.s.rsp_bad_sts ||
+ rsp_sts.s.rsp_crc_err ||
+ rsp_sts.s.rsp_timeout ||
+ rsp_sts.s.blk_crc_err ||
+ rsp_sts.s.blk_timeout ||
+ rsp_sts.s.dbuf_err) {
+ req->cmd->error = -EILSEQ;
+ } else {
+ req->cmd->error = 0;
+ }
+
+ if (host->dma_active && req->data) {
+ req->data->error = 0;
+ req->data->bytes_xfered = req->data->blocks *
+ req->data->blksz;
+ if (!(req->data->flags & MMC_DATA_WRITE) &&
+ req->data->sg_len > 1) {
+ size_t r = sg_copy_from_buffer(req->data->sg,
+ req->data->sg_len, host->linear_buf,
+ req->data->bytes_xfered);
+ WARN_ON(r != req->data->bytes_xfered);
+ }
+ }
+ if (rsp_sts.s.rsp_val) {
+ u64 rsp_hi;
+ u64 rsp_lo = cvmx_read_csr(
+ host->base + OCT_MIO_EMM_RSP_LO);
+
+ switch (rsp_sts.s.rsp_type) {
+ case 1:
+ case 3:
+ req->cmd->resp[0] = (rsp_lo >> 8) & 0xffffffff;
+ req->cmd->resp[1] = 0;
+ req->cmd->resp[2] = 0;
+ req->cmd->resp[3] = 0;
+ break;
+ case 2:
+ req->cmd->resp[3] = rsp_lo & 0xffffffff;
+ req->cmd->resp[2] = (rsp_lo >> 32) & 0xffffffff;
+ rsp_hi = cvmx_read_csr(host->base +
+ OCT_MIO_EMM_RSP_HI);
+ req->cmd->resp[1] = rsp_hi & 0xffffffff;
+ req->cmd->resp[0] = (rsp_hi >> 32) & 0xffffffff;
+ break;
+ default:
+ octeon_mmc_dbg("octeon_mmc_interrupt unhandled rsp_val %d\n",
+ rsp_sts.s.rsp_type);
+ break;
+ }
+ octeon_mmc_dbg("octeon_mmc_interrupt resp %08x %08x %08x %08x\n",
+ req->cmd->resp[0], req->cmd->resp[1],
+ req->cmd->resp[2], req->cmd->resp[3]);
+ }
+ if (emm_int.s.dma_err && rsp_sts.s.dma_pend) {
+ /* Try to clean up failed DMA */
+ union cvmx_mio_emm_dma emm_dma;
+
+ emm_dma.u64 =
+ cvmx_read_csr(host->base + OCT_MIO_EMM_DMA);
+ emm_dma.s.dma_val = 1;
+ emm_dma.s.dat_null = 1;
+ emm_dma.s.bus_id = rsp_sts.s.bus_id;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_DMA,
+ emm_dma.u64);
+ host->dma_err_pending = true;
+ host_done = false;
+ goto no_req_done;
+ }
+
+ host->current_req = NULL;
+ req->done(req);
+ }
+no_req_done:
+ if (host->n_minus_one) {
+ l2c_unlock_mem_region(host->n_minus_one, 512);
+ host->n_minus_one = 0;
+ }
+ if (host_done)
+ octeon_mmc_release_bus(host);
+out:
+ if (host->need_irq_handler_lock)
+ spin_unlock_irqrestore(&host->irq_handler_lock, flags);
+ else
+ __release(&host->irq_handler_lock);
+ return IRQ_RETVAL(emm_int.u64 != 0);
+}
+
+static void octeon_mmc_switch_to(struct octeon_mmc_slot *slot)
+{
+ struct octeon_mmc_host *host = slot->host;
+ struct octeon_mmc_slot *old_slot;
+ union cvmx_mio_emm_switch sw;
+ union cvmx_mio_emm_sample samp;
+
+ if (slot->bus_id == host->last_slot)
+ goto out;
+
+ if (host->last_slot >= 0 && host->slot[host->last_slot]) {
+ old_slot = host->slot[host->last_slot];
+ old_slot->cached_switch =
+ cvmx_read_csr(host->base + OCT_MIO_EMM_SWITCH);
+ old_slot->cached_rca =
+ cvmx_read_csr(host->base + OCT_MIO_EMM_RCA);
+ }
+ cvmx_write_csr(host->base + OCT_MIO_EMM_RCA, slot->cached_rca);
+ sw.u64 = slot->cached_switch;
+ sw.s.bus_id = 0;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, sw.u64);
+ sw.s.bus_id = slot->bus_id;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, sw.u64);
+
+ samp.u64 = 0;
+ samp.s.cmd_cnt = slot->cmd_cnt;
+ samp.s.dat_cnt = slot->dat_cnt;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_SAMPLE, samp.u64);
+out:
+ host->last_slot = slot->bus_id;
+}
+
+static void octeon_mmc_dma_request(struct mmc_host *mmc,
+ struct mmc_request *mrq)
+{
+ struct octeon_mmc_slot *slot;
+ struct octeon_mmc_host *host;
+ struct mmc_command *cmd;
+ struct mmc_data *data;
+ union cvmx_mio_emm_int emm_int;
+ union cvmx_mio_emm_dma emm_dma;
+ union cvmx_mio_ndf_dma_cfg dma_cfg;
+
+ cmd = mrq->cmd;
+ if (mrq->data == NULL || mrq->data->sg == NULL || !mrq->data->sg_len ||
+ mrq->stop == NULL || mrq->stop->opcode != MMC_STOP_TRANSMISSION) {
+ dev_err(&mmc->card->dev,
+ "Error: octeon_mmc_dma_request no data\n");
+ cmd->error = -EINVAL;
+ if (mrq->done)
+ mrq->done(mrq);
+ return;
+ }
+
+ slot = mmc_priv(mmc);
+ host = slot->host;
+
+ /* Only a single user of the bootbus at a time. */
+ octeon_mmc_acquire_bus(host);
+
+ octeon_mmc_switch_to(slot);
+
+ data = mrq->data;
+
+ if (data->timeout_ns) {
+ cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+ octeon_mmc_timeout_to_wdog(slot, data->timeout_ns));
+ octeon_mmc_dbg("OCT_MIO_EMM_WDOG %llu\n",
+ cvmx_read_csr(host->base + OCT_MIO_EMM_WDOG));
+ }
+
+ WARN_ON(host->current_req);
+ host->current_req = mrq;
+
+ host->sg_idx = 0;
+
+ WARN_ON(data->blksz * data->blocks > host->linear_buf_size);
+
+ if ((data->flags & MMC_DATA_WRITE) && data->sg_len > 1) {
+ size_t r = sg_copy_to_buffer(data->sg, data->sg_len,
+ host->linear_buf, data->blksz * data->blocks);
+ WARN_ON(data->blksz * data->blocks != r);
+ }
+
+ dma_cfg.u64 = 0;
+ dma_cfg.s.en = 1;
+ dma_cfg.s.rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
+#ifdef __LITTLE_ENDIAN
+ dma_cfg.s.endian = 1;
+#endif
+ dma_cfg.s.size = ((data->blksz * data->blocks) / 8) - 1;
+ if (!host->big_dma_addr) {
+ if (data->sg_len > 1)
+ dma_cfg.s.adr = virt_to_phys(host->linear_buf);
+ else
+ dma_cfg.s.adr = sg_phys(data->sg);
+ }
+ cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG, dma_cfg.u64);
+ octeon_mmc_dbg("MIO_NDF_DMA_CFG: %016llx\n",
+ (unsigned long long)dma_cfg.u64);
+ if (host->big_dma_addr) {
+ u64 addr;
+
+ if (data->sg_len > 1)
+ addr = virt_to_phys(host->linear_buf);
+ else
+ addr = sg_phys(data->sg);
+ cvmx_write_csr(host->ndf_base + OCT_MIO_EMM_DMA_ADR, addr);
+ octeon_mmc_dbg("MIO_EMM_DMA_ADR: %016llx\n",
+ (unsigned long long)addr);
+ }
+
+ emm_dma.u64 = 0;
+ emm_dma.s.bus_id = slot->bus_id;
+ emm_dma.s.dma_val = 1;
+ emm_dma.s.sector = mmc_card_blockaddr(mmc->card) ? 1 : 0;
+ emm_dma.s.rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
+ if (mmc_card_mmc(mmc->card) ||
+ (mmc_card_sd(mmc->card) &&
+ (mmc->card->scr.cmds & SD_SCR_CMD23_SUPPORT)))
+ emm_dma.s.multi = 1;
+ emm_dma.s.block_cnt = data->blocks;
+ emm_dma.s.card_addr = cmd->arg;
+
+ emm_int.u64 = 0;
+ emm_int.s.dma_done = 1;
+ emm_int.s.cmd_err = 1;
+ emm_int.s.dma_err = 1;
+ /* Clear the bit. */
+ cvmx_write_csr(host->base + OCT_MIO_EMM_INT, emm_int.u64);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_INT_EN, emm_int.u64);
+ host->dma_active = true;
+
+ if ((OCTEON_IS_MODEL(OCTEON_CN6XXX) ||
+ OCTEON_IS_MODEL(OCTEON_CNF7XXX)) &&
+ cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK &&
+ (data->blksz * data->blocks) > 1024) {
+ host->n_minus_one = dma_cfg.s.adr +
+ (data->blksz * data->blocks) - 1024;
+ l2c_lock_mem_region(host->n_minus_one, 512);
+ }
+
+ if (mmc->card && mmc_card_sd(mmc->card))
+ cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK,
+ 0x00b00000ull);
+ else
+ cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK,
+ 0xe4f90080ull);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_DMA, emm_dma.u64);
+ octeon_mmc_dbg("MIO_EMM_DMA: %llx\n", emm_dma.u64);
+}
+
+static void octeon_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct octeon_mmc_slot *slot;
+ struct octeon_mmc_host *host;
+ struct mmc_command *cmd;
+ union cvmx_mio_emm_int emm_int;
+ union cvmx_mio_emm_cmd emm_cmd;
+ struct octeon_mmc_cr_mods mods;
+
+ cmd = mrq->cmd;
+
+ if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK ||
+ cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) {
+ octeon_mmc_dma_request(mmc, mrq);
+ return;
+ }
+
+ mods = octeon_mmc_get_cr_mods(cmd);
+
+ slot = mmc_priv(mmc);
+ host = slot->host;
+
+ /* Only a single user of the bootbus at a time. */
+ octeon_mmc_acquire_bus(host);
+
+ octeon_mmc_switch_to(slot);
+
+ WARN_ON(host->current_req);
+ host->current_req = mrq;
+
+ emm_int.u64 = 0;
+ emm_int.s.cmd_done = 1;
+ emm_int.s.cmd_err = 1;
+ if (cmd->data) {
+ octeon_mmc_dbg("command has data\n");
+ if (cmd->data->flags & MMC_DATA_READ) {
+ sg_miter_start(&host->smi, mrq->data->sg,
+ mrq->data->sg_len,
+ SG_MITER_ATOMIC | SG_MITER_TO_SG);
+ } else {
+ struct sg_mapping_iter *smi = &host->smi;
+ unsigned int data_len =
+ mrq->data->blksz * mrq->data->blocks;
+ unsigned int bytes_xfered;
+ u64 dat = 0;
+ int shift = 56;
+ /*
+ * Copy data to the xmit buffer before
+ * issuing the command
+ */
+ sg_miter_start(smi, mrq->data->sg,
+ mrq->data->sg_len, SG_MITER_FROM_SG);
+ /* Auto inc from offset zero, dbuf zero */
+ cvmx_write_csr(host->base + OCT_MIO_EMM_BUF_IDX,
+ 0x10000ull);
+
+ for (bytes_xfered = 0; bytes_xfered < data_len;) {
+ if (smi->consumed >= smi->length) {
+ if (!sg_miter_next(smi))
+ break;
+ smi->consumed = 0;
+ }
+
+ while (smi->consumed < smi->length &&
+ shift >= 0) {
+
+ dat |= (u64)(((u8 *)(smi->addr))
+ [smi->consumed]) << shift;
+ bytes_xfered++;
+ smi->consumed++;
+ shift -= 8;
+ }
+ if (shift < 0) {
+ cvmx_write_csr(host->base +
+ OCT_MIO_EMM_BUF_DAT, dat);
+ shift = 56;
+ dat = 0;
+ }
+ }
+ sg_miter_stop(smi);
+ }
+ if (cmd->data->timeout_ns) {
+ cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+ octeon_mmc_timeout_to_wdog(slot,
+ cmd->data->timeout_ns));
+ octeon_mmc_dbg("OCT_MIO_EMM_WDOG %llu\n",
+ cvmx_read_csr(host->base +
+ OCT_MIO_EMM_WDOG));
+ }
+ } else {
+ cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+ ((u64)slot->clock * 850ull) / 1000ull);
+ octeon_mmc_dbg("OCT_MIO_EMM_WDOG %llu\n",
+ cvmx_read_csr(host->base + OCT_MIO_EMM_WDOG));
+ }
+ /* Clear the bit. */
+ cvmx_write_csr(host->base + OCT_MIO_EMM_INT, emm_int.u64);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_INT_EN, emm_int.u64);
+ host->dma_active = false;
+
+ emm_cmd.u64 = 0;
+ emm_cmd.s.cmd_val = 1;
+ emm_cmd.s.ctype_xor = mods.ctype_xor;
+ emm_cmd.s.rtype_xor = mods.rtype_xor;
+ if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
+ emm_cmd.s.offset = 64 -
+ ((cmd->data->blksz * cmd->data->blocks) / 8);
+ emm_cmd.s.bus_id = slot->bus_id;
+ emm_cmd.s.cmd_idx = cmd->opcode;
+ emm_cmd.s.arg = cmd->arg;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK, 0);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_CMD, emm_cmd.u64);
+ octeon_mmc_dbg("MIO_EMM_CMD: %llx\n", emm_cmd.u64);
+}
+
+static void octeon_mmc_reset_bus(struct octeon_mmc_slot *slot)
+{
+ union cvmx_mio_emm_cfg emm_cfg;
+ union cvmx_mio_emm_switch emm_switch;
+ u64 wdog = 0;
+
+ emm_cfg.u64 = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_CFG);
+ emm_switch.u64 = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_SWITCH);
+ wdog = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_WDOG);
+
+ emm_switch.s.switch_exe = 0;
+ emm_switch.s.switch_err0 = 0;
+ emm_switch.s.switch_err1 = 0;
+ emm_switch.s.switch_err2 = 0;
+ emm_switch.s.bus_id = 0;
+ cvmx_write_csr(slot->host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+ emm_switch.s.bus_id = slot->bus_id;
+ cvmx_write_csr(slot->host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+
+ slot->cached_switch = emm_switch.u64;
+
+ msleep(20);
+
+ cvmx_write_csr(slot->host->base + OCT_MIO_EMM_WDOG, wdog);
+}
+
+static void octeon_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct octeon_mmc_slot *slot;
+ struct octeon_mmc_host *host;
+ int bus_width;
+ int clock;
+ bool ddr_clock;
+ int hs_timing;
+ int power_class = 10;
+ int clk_period;
+ int timeout = 2000;
+ union cvmx_mio_emm_switch emm_switch;
+ union cvmx_mio_emm_rsp_sts emm_sts;
+
+ slot = mmc_priv(mmc);
+ host = slot->host;
+
+ /* Only a single user of the bootbus at a time. */
+ octeon_mmc_acquire_bus(host);
+
+ octeon_mmc_switch_to(slot);
+
+ octeon_mmc_dbg("Calling set_ios: slot: clk = 0x%x, bus_width = %d\n",
+ slot->clock, slot->bus_width);
+ octeon_mmc_dbg("Calling set_ios: ios: clk = 0x%x, vdd = %u, bus_width = %u, power_mode = %u, timing = %u\n",
+ ios->clock, ios->vdd, ios->bus_width, ios->power_mode,
+ ios->timing);
+ octeon_mmc_dbg("Calling set_ios: mmc: caps = 0x%x, bus_width = %d\n",
+ mmc->caps, mmc->ios.bus_width);
+
+ /*
+ * Reset the chip on each power off
+ */
+ if (ios->power_mode == MMC_POWER_OFF) {
+ octeon_mmc_reset_bus(slot);
+ gpiod_set_value_cansleep(slot->pwr_gpiod, 0);
+ } else {
+ gpiod_set_value_cansleep(slot->pwr_gpiod, 1);
+ }
+
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_8:
+ bus_width = 2;
+ break;
+ case MMC_BUS_WIDTH_4:
+ bus_width = 1;
+ break;
+ case MMC_BUS_WIDTH_1:
+ bus_width = 0;
+ break;
+ default:
+ octeon_mmc_dbg("unknown bus width %d\n", ios->bus_width);
+ bus_width = 0;
+ break;
+ }
+
+ hs_timing = (ios->timing == MMC_TIMING_MMC_HS);
+ ddr_clock = (bus_width && ios->timing >= MMC_TIMING_UHS_DDR50);
+
+ if (ddr_clock)
+ bus_width |= 4;
+
+ if (ios->clock) {
+ slot->clock = ios->clock;
+ slot->bus_width = bus_width;
+
+ clock = slot->clock;
+
+ if (clock > 52000000)
+ clock = 52000000;
+
+ clk_period = (octeon_get_io_clock_rate() + clock - 1) /
+ (2 * clock);
+
+ /* until clock-renengotiate-on-CRC is in */
+ if (ddr_clock && ddr > 1)
+ clk_period *= 2;
+
+ emm_switch.u64 = 0;
+ emm_switch.s.hs_timing = hs_timing;
+ emm_switch.s.bus_width = bus_width;
+ emm_switch.s.power_class = power_class;
+ emm_switch.s.clk_hi = clk_period;
+ emm_switch.s.clk_lo = clk_period;
+
+ if (!octeon_mmc_switch_val_changed(slot, emm_switch.u64)) {
+ octeon_mmc_dbg("No change from 0x%llx mio_emm_switch, returning.\n",
+ emm_switch.u64);
+ goto out;
+ }
+
+ octeon_mmc_dbg("Writing 0x%llx to mio_emm_wdog\n",
+ ((u64)clock * 850ull) / 1000ull);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+ ((u64)clock * 850ull) / 1000ull);
+ octeon_mmc_dbg("Writing 0x%llx to mio_emm_switch\n",
+ emm_switch.u64);
+
+ cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+ emm_switch.s.bus_id = slot->bus_id;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+ slot->cached_switch = emm_switch.u64;
+
+ do {
+ emm_sts.u64 =
+ cvmx_read_csr(host->base + OCT_MIO_EMM_RSP_STS);
+ if (!emm_sts.s.switch_val)
+ break;
+ udelay(100);
+ } while (timeout-- > 0);
+
+ if (timeout <= 0) {
+ octeon_mmc_dbg("switch command timed out, status=0x%llx\n",
+ emm_sts.u64);
+ goto out;
+ }
+ }
+out:
+ octeon_mmc_release_bus(host);
+}
+
+static int octeon_mmc_get_ro(struct mmc_host *mmc)
+{
+ struct octeon_mmc_slot *slot = mmc_priv(mmc);
+
+ if (!slot->ro_gpiod)
+ return -ENOSYS;
+
+ return gpiod_get_value_cansleep(slot->ro_gpiod);
+}
+
+static int octeon_mmc_get_cd(struct mmc_host *mmc)
+{
+ struct octeon_mmc_slot *slot = mmc_priv(mmc);
+
+ if (!slot->cd_gpiod >= 0)
+ return -ENOSYS;
+
+ return gpiod_get_value_cansleep(slot->cd_gpiod);
+}
+
+static const struct mmc_host_ops octeon_mmc_ops = {
+ .request = octeon_mmc_request,
+ .set_ios = octeon_mmc_set_ios,
+ .get_ro = octeon_mmc_get_ro,
+ .get_cd = octeon_mmc_get_cd,
+};
+
+static void octeon_mmc_set_clock(struct octeon_mmc_slot *slot,
+ unsigned int clock)
+{
+ struct mmc_host *mmc = slot->mmc;
+
+ clock = min(clock, mmc->f_max);
+ clock = max(clock, mmc->f_min);
+ slot->clock = clock;
+}
+
+static int octeon_mmc_initlowlevel(struct octeon_mmc_slot *slot,
+ int bus_width)
+{
+ union cvmx_mio_emm_switch emm_switch;
+ struct octeon_mmc_host *host = slot->host;
+
+ host->emm_cfg |= 1ull << slot->bus_id;
+ cvmx_write_csr(slot->host->base + OCT_MIO_EMM_CFG, host->emm_cfg);
+ octeon_mmc_set_clock(slot, 400000);
+
+ /* Program initial clock speed and power */
+ emm_switch.u64 = 0;
+ emm_switch.s.power_class = 10;
+ emm_switch.s.clk_hi = (slot->sclock / slot->clock) / 2;
+ emm_switch.s.clk_lo = (slot->sclock / slot->clock) / 2;
+
+ cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+ emm_switch.s.bus_id = slot->bus_id;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+ slot->cached_switch = emm_switch.u64;
+
+ cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+ ((u64)slot->clock * 850ull) / 1000ull);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK, 0xe4f90080ull);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_RCA, 1);
+ return 0;
+}
+
+static int octeon_mmc_slot_probe(struct platform_device *pdev)
+{
+ struct mmc_host *mmc;
+ struct octeon_mmc_host *host;
+ struct octeon_mmc_slot *slot;
+ struct device *dev = &pdev->dev;
+ struct device_node *node = pdev->dev.of_node;
+ struct platform_device *ppdev = to_platform_device(pdev->dev.parent);
+ u32 id, bus_width, max_freq, cmd_skew, dat_skew;
+ u64 clock_period;
+ int ret;
+
+ WARN_ON(!pdev->dev.parent);
+
+ host = platform_get_drvdata(ppdev);
+
+ ret = of_property_read_u32(node, "reg", &id);
+ if (ret) {
+ dev_err(dev, "Missing or invalid reg property on %s\n",
+ of_node_full_name(node));
+ return ret;
+ }
+
+ if (id >= OCTEON_MAX_MMC || host->slot[id]) {
+ dev_err(dev, "Invalid reg property on %s\n",
+ of_node_full_name(node));
+ return -EINVAL;
+ }
+
+ mmc = mmc_alloc_host(sizeof(struct octeon_mmc_slot), dev);
+ if (!mmc) {
+ dev_err(dev, "alloc host failed\n");
+ return -ENOMEM;
+ }
+
+ slot = mmc_priv(mmc);
+ slot->mmc = mmc;
+ slot->host = host;
+
+ ret = of_property_read_u32(node, "cavium,bus-max-width", &bus_width);
+ if (ret) {
+ bus_width = 8;
+ dev_info(dev, "Bus width not found for slot %u, defaulting to %u\n",
+ id, bus_width);
+ } else {
+ switch (bus_width) {
+ case 1:
+ case 4:
+ case 8:
+ break;
+ default:
+ dev_err(dev, "Invalid bus width for slot %u\n", id);
+ ret = -EINVAL;
+ goto err;
+ }
+ }
+
+ ret = of_property_read_u32(node, "cavium,cmd-clk-skew", &cmd_skew);
+ if (ret)
+ cmd_skew = 0;
+
+ ret = of_property_read_u32(node, "cavium,dat-clk-skew", &dat_skew);
+ if (ret)
+ dat_skew = 0;
+
+ ret = of_property_read_u32(node, "spi-max-frequency", &max_freq);
+ if (ret) {
+ max_freq = 52000000;
+ dev_info(dev, "No spi-max-frequency for slot %u, defaulting to %u\n",
+ id, max_freq);
+ }
+
+ slot->ro_gpiod = devm_gpiod_get_optional(dev, "wp", GPIOD_IN);
+ if (IS_ERR(slot->ro_gpiod)) {
+ dev_err(dev, "Invalid WP GPIO\n");
+ ret = PTR_ERR(slot->ro_gpiod);
+ goto err;
+ }
+
+ slot->cd_gpiod = devm_gpiod_get_optional(dev, "cd", GPIOD_IN);
+ if (IS_ERR(slot->cd_gpiod)) {
+ dev_err(dev, "Invalid CD GPIO\n");
+ ret = PTR_ERR(slot->cd_gpiod);
+ goto err;
+ }
+
+ slot->pwr_gpiod = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
+ if (IS_ERR(slot->pwr_gpiod)) {
+ dev_err(dev, "Invalid POWER GPIO\n");
+ ret = PTR_ERR(slot->pwr_gpiod);
+ goto err;
+ }
+
+ /*
+ * Set up host parameters.
+ */
+ mmc->ops = &octeon_mmc_ops;
+ mmc->f_min = 400000;
+ mmc->f_max = max_freq;
+ mmc->caps = MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
+ MMC_CAP_8_BIT_DATA | MMC_CAP_4_BIT_DATA |
+ MMC_CAP_ERASE;
+ mmc->ocr_avail = 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;
+
+ /* post-sdk23 caps */
+ mmc->caps |=
+ ((mmc->f_max >= 12000000) * MMC_CAP_UHS_SDR12) |
+ ((mmc->f_max >= 25000000) * MMC_CAP_UHS_SDR25) |
+ ((mmc->f_max >= 50000000) * MMC_CAP_UHS_SDR50) |
+ MMC_CAP_CMD23;
+
+ if (slot->pwr_gpiod)
+ mmc->caps |= MMC_CAP_POWER_OFF_CARD;
+
+ /* "1.8v" capability is actually 1.8-or-3.3v */
+ if (ddr)
+ mmc->caps |= MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR;
+
+ mmc->max_segs = 64;
+ mmc->max_seg_size = host->linear_buf_size;
+ mmc->max_req_size = host->linear_buf_size;
+ mmc->max_blk_size = 512;
+ mmc->max_blk_count = mmc->max_req_size / 512;
+
+ slot->clock = mmc->f_min;
+ slot->sclock = octeon_get_io_clock_rate();
+
+ clock_period = 1000000000000ull / slot->sclock; /* period in pS */
+ slot->cmd_cnt = (cmd_skew + clock_period / 2) / clock_period;
+ slot->dat_cnt = (dat_skew + clock_period / 2) / clock_period;
+
+ slot->bus_width = bus_width;
+ slot->bus_id = id;
+ slot->cached_rca = 1;
+
+ platform_set_drvdata(pdev, slot);
+
+ /* Only a single user of the bootbus at a time. */
+ octeon_mmc_acquire_bus(host);
+ host->slot[id] = slot;
+
+ octeon_mmc_switch_to(slot);
+ /* Initialize MMC Block. */
+ octeon_mmc_initlowlevel(slot, bus_width);
+
+ octeon_mmc_release_bus(host);
+
+ ret = mmc_add_host(mmc);
+ if (ret) {
+ dev_err(dev, "mmc_add_host() returned %d\n", ret);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ slot->host->slot[id] = NULL;
+
+ gpiod_set_value_cansleep(slot->pwr_gpiod, 0);
+
+ mmc_free_host(slot->mmc);
+ return ret;
+}
+
+static int octeon_mmc_slot_remove(struct platform_device *pdev)
+{
+ struct octeon_mmc_slot *slot = platform_get_drvdata(pdev);
+
+ mmc_remove_host(slot->mmc);
+
+ slot->host->slot[slot->bus_id] = NULL;
+
+ gpiod_set_value_cansleep(slot->pwr_gpiod, 0);
+
+ mmc_free_host(slot->mmc);
+
+ return 0;
+}
+
+static const struct of_device_id octeon_mmc_slot_match[] = {
+ { .compatible = "cavium,octeon-6130-mmc-slot", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, octeon_mmc_slot_match);
+
+static struct platform_driver octeon_mmc_slot_driver = {
+ .probe = octeon_mmc_slot_probe,
+ .remove = octeon_mmc_slot_remove,
+ .driver = {
+ .name = "octeon_mmc_slot",
+ .of_match_table = octeon_mmc_slot_match,
+ },
+};
+
+static int octeon_mmc_probe(struct platform_device *pdev)
+{
+ struct octeon_mmc_host *host;
+ struct resource *res;
+ void __iomem *base;
+ int mmc_irq[9];
+ int i;
+ int ret = 0;
+ struct device_node *node = pdev->dev.of_node;
+ bool cn78xx_style;
+ u64 t;
+
+ host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return -ENOMEM;
+
+ spin_lock_init(&host->irq_handler_lock);
+ sema_init(&host->mmc_serializer, 1);
+
+ cn78xx_style = of_device_is_compatible(node, "cavium,octeon-7890-mmc");
+ if (cn78xx_style) {
+ host->need_bootbus_lock = false;
+ host->big_dma_addr = true;
+ host->need_irq_handler_lock = true;
+ /*
+ * First seven are the EMM_INT bits 0..6, then two for
+ * the EMM_DMA_INT bits
+ */
+ for (i = 0; i < 9; i++) {
+ mmc_irq[i] = platform_get_irq(pdev, i);
+ if (mmc_irq[i] < 0)
+ return mmc_irq[i];
+ }
+ } else {
+ host->need_bootbus_lock = true;
+ host->big_dma_addr = false;
+ host->need_irq_handler_lock = false;
+ /* First one is EMM second NDF_DMA */
+ for (i = 0; i < 2; i++) {
+ mmc_irq[i] = platform_get_irq(pdev, i);
+ if (mmc_irq[i] < 0)
+ return mmc_irq[i];
+ }
+ }
+ host->last_slot = -1;
+
+ if (bb_size < 512 || bb_size >= (1 << 24))
+ bb_size = 1 << 18;
+ host->linear_buf_size = bb_size;
+ host->linear_buf = devm_kzalloc(&pdev->dev, host->linear_buf_size,
+ GFP_KERNEL);
+
+ if (!host->linear_buf) {
+ dev_err(&pdev->dev, "devm_kzalloc failed\n");
+ return -ENOMEM;
+ }
+
+ host->pdev = pdev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Platform resource[0] is missing\n");
+ return -ENXIO;
+ }
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+ host->base = (__force u64)base;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res) {
+ dev_err(&pdev->dev, "Platform resource[1] is missing\n");
+ return -EINVAL;
+ }
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+ host->ndf_base = (__force u64)base;
+ /*
+ * Clear out any pending interrupts that may be left over from
+ * bootloader.
+ */
+ t = cvmx_read_csr(host->base + OCT_MIO_EMM_INT);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_INT, t);
+ if (cn78xx_style) {
+ /* Only CMD_DONE, DMA_DONE, CMD_ERR, DMA_ERR */
+ for (i = 1; i <= 4; i++) {
+ ret = devm_request_irq(&pdev->dev, mmc_irq[i],
+ octeon_mmc_interrupt,
+ 0, DRV_NAME, host);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Error: devm_request_irq %d\n",
+ mmc_irq[i]);
+ return ret;
+ }
+ }
+ } else {
+ ret = devm_request_irq(&pdev->dev, mmc_irq[0],
+ octeon_mmc_interrupt, 0, DRV_NAME, host);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Error: devm_request_irq %d\n",
+ mmc_irq[0]);
+ return ret;
+ }
+ }
+
+ host->global_pwr_gpiod = devm_gpiod_get_optional(&pdev->dev, "power",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(host->global_pwr_gpiod)) {
+ dev_err(&host->pdev->dev, "Invalid POWER GPIO\n");
+ return PTR_ERR(host->global_pwr_gpiod);
+ }
+
+ platform_set_drvdata(pdev, host);
+
+ ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
+ if (ret) {
+ dev_err(&host->pdev->dev, "Error populating slots\n");
+ gpiod_set_value_cansleep(host->global_pwr_gpiod, 0);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int octeon_mmc_remove(struct platform_device *pdev)
+{
+ union cvmx_mio_ndf_dma_cfg ndf_dma_cfg;
+ struct octeon_mmc_host *host = platform_get_drvdata(pdev);
+
+ ndf_dma_cfg.u64 = cvmx_read_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG);
+ ndf_dma_cfg.s.en = 0;
+ cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG, ndf_dma_cfg.u64);
+
+ gpiod_set_value_cansleep(host->global_pwr_gpiod, 0);
+
+ return 0;
+}
+
+static const struct of_device_id octeon_mmc_match[] = {
+ {
+ .compatible = "cavium,octeon-6130-mmc",
+ },
+ {
+ .compatible = "cavium,octeon-7890-mmc",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, octeon_mmc_match);
+
+static struct platform_driver octeon_mmc_driver = {
+ .probe = octeon_mmc_probe,
+ .remove = octeon_mmc_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = octeon_mmc_match,
+ },
+};
+
+static int __init octeon_mmc_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&octeon_mmc_driver);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&octeon_mmc_slot_driver);
+ if (ret) {
+ platform_driver_unregister(&octeon_mmc_driver);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void __exit octeon_mmc_cleanup(void)
+{
+ platform_driver_unregister(&octeon_mmc_slot_driver);
+ platform_driver_unregister(&octeon_mmc_driver);
+}
+
+module_init(octeon_mmc_init);
+module_exit(octeon_mmc_cleanup);
+
+MODULE_AUTHOR("Cavium Inc. <support@cavium.com>");
+MODULE_DESCRIPTION("low-level driver for Cavium OCTEON MMC/SSD card");
+MODULE_LICENSE("GPL");
--
2.3.2