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Message-Id: <1336590425-10381-1-git-send-email-ddaney.cavm@gmail.com>
Date: Wed, 9 May 2012 12:07:05 -0700
From: David Daney <ddaney.cavm@...il.com>
To: Chris Ball <cjb@...top.org>, linux-mmc@...r.kernel.org,
devicetree-discuss@...ts.ozlabs.org,
Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <rob.herring@...xeda.com>
Cc: linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
David Daney <david.daney@...ium.com>
Subject: [PATCH RFC] mmc: Add host driver for OCTEON MMC controller.
From: David Daney <david.daney@...ium.com>
The OCTEON MMC controller is currently found on cn61XX and cnf71XX
devices. Device parameters are configured from device tree data.
Currenly supported are eMMC, MMC and SD devices.
Signed-off-by: David Daney <david.daney@...ium.com>
---
This patch depends on:
http://www.linux-mips.org/archives/linux-mips/2012-04/msg00198.html
Which isn't merged yet, so for the time being this remains an RFC.
However, once Ralf merges the prerequisite, we could consider merging
this one as well.
.../devicetree/bindings/mmc/octeon-mmc.txt | 51 +
drivers/mmc/host/Kconfig | 10 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/octeon_mmc.c | 1107 ++++++++++++++++++++
4 files changed, 1169 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mmc/octeon-mmc.txt
create mode 100644 drivers/mmc/host/octeon_mmc.c
diff --git a/Documentation/devicetree/bindings/mmc/octeon-mmc.txt b/Documentation/devicetree/bindings/mmc/octeon-mmc.txt
new file mode 100644
index 0000000..86f1fe5
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/octeon-mmc.txt
@@ -0,0 +1,51 @@
+* 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.
+
+Required properties:
+- compatible : Should be "cavium,octeon-6130-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 : Two entries:
+ 1) The MMC controller interrupt line.
+ 2) The MMC DMA engine interrupt line.
+- #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.
+- cavium,bus-max-width : The number of data lines present in the slot.
+- spi-max-frequency : The maximum operating frequency of the slot.
+
+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
+
+Example:
+ mmc@...0000002000 {
+ 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 2bc06e7..37de129 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -229,6 +229,16 @@ config MMC_SDHCI_S3C_DMA
YMMV.
+config MMC_OCTEON
+ tristate "Cavium OCTEON Multimedia Card Interface support"
+ depends on CPU_CAVIUM_OCTEON
+ 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_OMAP
tristate "TI OMAP Multimedia Card Interface support"
depends on ARCH_OMAP
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 3e7e26d..f58f49c 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o
obj-$(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_AT91) += at91_mci.o
diff --git a/drivers/mmc/host/octeon_mmc.c b/drivers/mmc/host/octeon_mmc.c
new file mode 100644
index 0000000..cb4243d
--- /dev/null
+++ b/drivers/mmc/host/octeon_mmc.c
@@ -0,0 +1,1107 @@
+/*
+ * 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 Cavium Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/scatterlist.h>
+#include <linux/interrupt.h>
+#include <linux/of_gpio.h>
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/module.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 <asm/byteorder.h>
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-mio-defs.h>
+
+#define DRV_NAME "octeon_mmc"
+#define DRV_VERSION "1.0"
+
+#define OCTEON_MAX_MMC 4
+
+#define OCT_MIO_NDF_DMA_CFG 0x00
+#define OCT_MIO_NDF_DMA_INT 0x08
+#define OCT_MIO_NDF_DMA_INT_EN 0x10
+
+#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_STS_MASK 0x98
+#define OCT_MIO_EMM_RCA 0xa0
+#define OCT_MIO_EMM_BUF_IDX 0xe0
+#define OCT_MIO_EMM_BUF_DAT 0xe8
+
+struct octeon_mmc_host {
+ spinlock_t lock;
+ u64 base;
+ u64 ndf_base;
+ u64 last_emm_switch;
+
+ struct mmc_request *current_req;
+ struct sg_mapping_iter smi;
+ int sg_idx;
+ bool dma_active;
+
+ struct semaphore mmc_serializer;
+
+ struct platform_device *pdev;
+
+ struct octeon_mmc_slot *slot[OCTEON_MAX_MMC];
+};
+
+struct octeon_mmc_slot {
+ struct mmc_host *mmc;
+ struct octeon_mmc_host *host;
+
+ unsigned int clock;
+ unsigned int sclock;
+
+ int bus_width;
+ int bus_id;
+ int ro_gpio;
+ int cd_gpio;
+ int power_gpio;
+ bool cd_gpio_active_low;
+ bool ro_gpio_active_low;
+ bool power_gpio_active_low;
+};
+
+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;
+};
+
+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;
+
+ 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->host->last_emm_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 void octeon_mmc_dma_next(struct octeon_mmc_host *host)
+{
+ struct scatterlist *sg;
+ struct mmc_data *data;
+ union cvmx_mio_ndf_dma_cfg dma_cfg;
+ u64 dma_int_en;
+
+ data = host->current_req->data;
+ sg = data->sg + host->sg_idx;
+
+ 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 = (sg->length / 8) - 1;
+ dma_cfg.s.adr = sg_phys(sg);
+
+ host->sg_idx++;
+
+ if (host->sg_idx >= host->current_req->data->sg_len)
+ dma_int_en = 0;
+ else
+ dma_int_en = 1;
+
+ cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_INT_EN, dma_int_en);
+ cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_CFG, dma_cfg.u64);
+
+}
+
+static irqreturn_t octeon_mmc_dma_interrupt(int irq, void *dev_id)
+{
+ struct octeon_mmc_host *host = dev_id;
+ unsigned long flags;
+
+ pr_debug("Got interrupt: NDF_DMA_INT\n");
+ spin_lock_irqsave(&host->lock, flags);
+ /* Clear any pending irqs */
+ cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_INT, 1);
+
+ if (!host->current_req || !host->current_req->data) {
+ pr_err("ERROR: no current_req for octeon_mmc_dma_interrupt\n");
+ goto out;
+ }
+
+ if (host->sg_idx < host->current_req->data->sg_len)
+ octeon_mmc_dma_next(host);
+out:
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ return IRQ_RETVAL(1);
+}
+
+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;
+
+ spin_lock_irqsave(&host->lock, flags);
+ 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);
+
+ pr_debug("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);
+ pr_debug("octeon_mmc_interrupt MIO_EMM_RSP_STS 0x%llx\n", rsp_sts.u64);
+
+ if (!host->dma_active && emm_int.s.buf_done && req->cmd->data &&
+ ((rsp_sts.u64 >> 7) & 3) == 1) {
+ /* Read */
+ int dbuf = rsp_sts.s.dbuf;
+ struct sg_mapping_iter *smi = &host->smi;
+ unsigned int bytes_xfered = 0;
+ 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 (;;) {
+ 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) = (dat >> shift) & 0xff;
+ bytes_xfered++;
+ smi->addr++;
+ smi->consumed++;
+ shift -= 8;
+ }
+ }
+ sg_miter_stop(smi);
+ req->cmd->data->bytes_xfered = bytes_xfered;
+ req->cmd->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.u64 & (7ull << 13))
+ req->cmd->error = -EILSEQ;
+ else
+ req->cmd->error = 0;
+
+ if (host->dma_active && req->cmd->data) {
+ req->cmd->data->error = 0;
+ req->cmd->data->bytes_xfered = req->cmd->data->blocks * req->cmd->data->blksz;
+ }
+ 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:
+ pr_debug("octeon_mmc_interrupt unhandled rsp_val %d\n",
+ rsp_sts.s.rsp_type);
+ break;
+ }
+ pr_debug("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 = 0;
+ 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->current_req = NULL;
+ req->done(req);
+ }
+ spin_unlock_irqrestore(&host->lock, flags);
+ if (host_done)
+ up(&host->mmc_serializer);
+out:
+ return IRQ_RETVAL(emm_int.u64 != 0);
+}
+
+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;
+ unsigned long flags;
+
+ cmd = mrq->cmd;
+ if (mrq->data == NULL || mrq->data->sg == NULL || !mrq->data->sg_len ||
+ mrq->stop == NULL || mrq->stop->opcode != MMC_STOP_TRANSMISSION) {
+ pr_err("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 host block at a time. */
+ down(&host->mmc_serializer);
+
+ 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));
+ pr_debug("OCT_MIO_EMM_WDOG %llu\n",
+ cvmx_read_csr(host->base + OCT_MIO_EMM_WDOG));
+ }
+
+ spin_lock_irqsave(&host->lock, flags);
+ WARN_ON(host->current_req);
+ host->current_req = mrq;
+
+ host->sg_idx = 0;
+
+ /* Clear any pending irqs */
+ cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_INT, 1);
+
+ octeon_mmc_dma_next(host);
+ 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;
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK, 0xe4f90080ull);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_STS_MASK, 0);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_DMA, emm_dma.u64);
+ pr_debug("Send the dma command: %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;
+ unsigned long flags;
+
+ 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 host block at a time. */
+ down(&host->mmc_serializer);
+
+ spin_lock_irqsave(&host->lock, flags);
+ 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) {
+ pr_debug("command has data\n");
+ cmd->error = -EINPROGRESS;
+ if (cmd->data->flags & MMC_DATA_READ) {
+ emm_int.s.buf_done = 1;
+ sg_miter_start(&host->smi, mrq->cmd->data->sg,
+ mrq->cmd->data->sg_len, SG_MITER_ATOMIC | SG_MITER_TO_SG);
+ } else {
+ struct sg_mapping_iter *smi = &host->smi;
+ unsigned int bytes_xfered = 0;
+ u64 dat = 0;
+ int shift = 56;
+ /* Copy data to the xmit buffer before issuing the command */
+ sg_miter_start(smi, mrq->cmd->data->sg,
+ mrq->cmd->data->sg_len, SG_MITER_TO_SG);
+ /* Auto inc from offset zero, dbuf zero */
+ cvmx_write_csr(host->base + OCT_MIO_EMM_BUF_IDX, 0x10000ull);
+
+ for (;;) {
+ 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)) << shift;
+ bytes_xfered++;
+ smi->addr++;
+ 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);
+ cmd->data->bytes_xfered = bytes_xfered;
+ cmd->data->error = 0;
+ }
+ if (cmd->data->timeout_ns) {
+ cvmx_write_csr(host->base + OCT_MIO_EMM_WDOG,
+ octeon_mmc_timeout_to_wdog(slot, cmd->data->timeout_ns));
+ pr_debug("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);
+ pr_debug("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;
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ 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);
+ pr_debug("Send the command: %llx\n", emm_cmd.u64);
+
+}
+
+static void octeon_mmc_reset_bus(struct octeon_mmc_slot *slot, int preserve)
+{
+ 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);
+ if (preserve) {
+ emm_switch.u64 = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_SWITCH);
+ wdog = cvmx_read_csr(slot->host->base + OCT_MIO_EMM_WDOG);
+ }
+
+ /* Reset the bus */
+ emm_cfg.u64 &= ~(1 << slot->bus_id);
+ cvmx_write_csr(slot->host->base + OCT_MIO_EMM_CFG, emm_cfg.u64);
+ msleep(10); /* Wait 10ms */
+ emm_cfg.u64 |= 1 << slot->bus_id;
+ cvmx_write_csr(slot->host->base + OCT_MIO_EMM_CFG, emm_cfg.u64);
+
+ msleep(10);
+
+ /* Restore switch settings */
+ if (preserve) {
+ emm_switch.s.switch_exe = 0;
+ emm_switch.s.switch_err0 = 0;
+ emm_switch.s.switch_err1 = 0;
+ emm_switch.s.switch_err2 = 0;
+ slot->host->last_emm_switch = emm_switch.u64;
+ cvmx_write_csr(slot->host->base + OCT_MIO_EMM_SWITCH,
+ emm_switch.u64);
+ msleep(10);
+ cvmx_write_csr(slot->host->base + OCT_MIO_EMM_WDOG, wdog);
+ } else {
+ slot->host->last_emm_switch = 0;
+ }
+}
+
+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;
+ 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 host block at a time. */
+ down(&host->mmc_serializer);
+
+ pr_debug("Calling set_ios: slot: clk = 0x%x, bus_width = %d\n",
+ slot->clock, slot->bus_width);
+ pr_debug("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);
+ pr_debug("Calling set_ios: mmc: caps = 0x%lx, 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, 1);
+ if (slot->power_gpio >= 0)
+ gpio_set_value_cansleep(slot->power_gpio,
+ slot->power_gpio_active_low ? 1 : 0);
+ } else {
+ if (slot->power_gpio >= 0)
+ gpio_set_value_cansleep(slot->power_gpio,
+ slot->power_gpio_active_low ? 0 : 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:
+ pr_debug("unknown bus width %d\n", ios->bus_width);
+ bus_width = 0;
+ break;
+ }
+ hs_timing = (ios->timing == MMC_TIMING_MMC_HS);
+ if (ios->clock) {
+ slot->clock = ios->clock;
+ slot->bus_width = bus_width;
+
+ clock = slot->clock;
+
+ if (clock > 52000000)
+ clock = 50000000;
+
+ clk_period = (octeon_get_io_clock_rate() + clock - 1) / (2 * clock);
+
+ emm_switch.u64 = 0;
+ emm_switch.s.bus_id = slot->bus_id;
+ 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)) {
+ pr_debug("No change from 0x%llx mio_emm_switch, returning.\n",
+ emm_switch.u64);
+ goto out;
+ }
+
+ pr_debug("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);
+ pr_debug("Writing 0x%llx to mio_emm_switch\n", emm_switch.u64);
+ cvmx_write_csr(host->base + OCT_MIO_EMM_SWITCH, emm_switch.u64);
+ slot->host->last_emm_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) {
+ pr_debug("%s: switch command timed out, status=0x%llx\n",
+ __func__, emm_sts.u64);
+ goto out;
+ }
+ }
+out:
+ up(&host->mmc_serializer);
+}
+
+static int octeon_mmc_get_ro(struct mmc_host *mmc)
+{
+ struct octeon_mmc_slot *slot = mmc_priv(mmc);
+
+ if (slot->ro_gpio >= 0) {
+ int pin = gpio_get_value_cansleep(slot->ro_gpio);
+ if (pin < 0)
+ return pin;
+ if (slot->ro_gpio_active_low)
+ pin = !pin;
+ return pin;
+ } else {
+ return -ENOSYS;
+ }
+}
+
+static int octeon_mmc_get_cd(struct mmc_host *mmc)
+{
+ struct octeon_mmc_slot *slot = mmc_priv(mmc);
+
+ if (slot->cd_gpio >= 0) {
+ int pin = gpio_get_value_cansleep(slot->cd_gpio);
+ if (pin < 0)
+ return pin;
+ if (slot->cd_gpio_active_low)
+ pin = !pin;
+ return pin;
+ } else {
+ return -ENOSYS;
+ }
+}
+
+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 id,
+ int bus_width)
+{
+ union cvmx_mio_emm_switch emm_switch;
+ struct octeon_mmc_host *host = slot->host;
+
+ octeon_mmc_reset_bus(slot, 0);
+
+ octeon_mmc_set_clock(slot, 400000);
+
+ /* Program initial clock speed and power */
+ emm_switch.u64 = 0;
+ emm_switch.s.bus_id = id;
+ 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;
+ slot->host->last_emm_switch = emm_switch.u64;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_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);
+
+ return 0;
+}
+
+static int __devinit octeon_init_slot(struct octeon_mmc_host *host, int id,
+ int bus_width, int max_freq,
+ int ro_gpio, int cd_gpio, int power_gpio,
+ bool ro_low, bool cd_low, bool power_low)
+{
+ struct mmc_host *mmc;
+ struct octeon_mmc_slot *slot;
+ int ret;
+
+ /*
+ * Allocate MMC structue
+ */
+ mmc = mmc_alloc_host(sizeof(struct octeon_mmc_slot), &host->pdev->dev);
+ if (!mmc) {
+ pr_debug("alloc host failed\n");
+ return -ENOMEM;
+ }
+
+ slot = mmc_priv(mmc);
+ slot->mmc = mmc;
+ slot->host = host;
+ slot->ro_gpio = ro_gpio;
+ slot->cd_gpio = cd_gpio;
+ slot->power_gpio = power_gpio;
+ slot->ro_gpio_active_low = ro_low;
+ slot->cd_gpio_active_low = cd_low;
+ slot->power_gpio_active_low = power_low;
+
+ if (slot->ro_gpio >= 0)
+ gpio_direction_input(slot->ro_gpio);
+ if (slot->cd_gpio >= 0)
+ gpio_direction_input(slot->cd_gpio);
+ if (slot->power_gpio >= 0)
+ gpio_direction_output(slot->power_gpio,
+ slot->power_gpio_active_low ? 1 : 0);
+
+ /*
+ * 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_CAP_CMD23;
+ 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;
+
+ mmc->max_segs = 64;
+ mmc->max_seg_size = (1 << 23) - 8;
+ mmc->max_req_size = mmc->max_seg_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();
+
+ slot->bus_width = bus_width;
+ slot->bus_id = id;
+
+ /* Initialize MMC Block. */
+ octeon_mmc_initlowlevel(slot, id, bus_width);
+
+ host->slot[id] = slot;
+ ret = mmc_add_host(mmc);
+ pr_debug("mmc_add_host returned %d\n", ret);
+
+ return 0;
+}
+
+static int __devinit octeon_mmc_probe(struct platform_device *pdev)
+{
+ union cvmx_mio_emm_cfg emm_cfg;
+ struct octeon_mmc_host *host;
+ struct resource *res;
+ int mmc_irq, dma_irq;
+ int ret = 0;
+ struct device_node *node;
+ int found = 0;
+
+ mmc_irq = platform_get_irq(pdev, 0);
+ if (mmc_irq < 0)
+ return mmc_irq;
+
+ dma_irq = platform_get_irq(pdev, 1);
+ if (dma_irq < 0)
+ return dma_irq;
+
+ host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+ if (!host) {
+ dev_err(&pdev->dev, "devm_kzalloc failed\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ host->pdev = pdev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Platform resource is missing\n");
+ ret = -ENXIO;
+ goto err;
+ }
+ if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
+ res->name)) {
+ dev_err(&pdev->dev, "request_mem_region 0 failed\n");
+ goto err;
+ }
+
+ host->base = (u64)devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!host->base) {
+ dev_err(&pdev->dev, "Platform resource0 is missing\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res) {
+ dev_err(&pdev->dev, "Platform resource1 is missing\n");
+ ret = -EINVAL;
+ goto err;
+ }
+ if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
+ res->name)) {
+ dev_err(&pdev->dev, "request_mem_region 1 failed\n");
+ goto err;
+ }
+ host->ndf_base = (u64)devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!host->ndf_base) {
+ dev_err(&pdev->dev, "Platform resource0 is missing\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ ret = devm_request_irq(&pdev->dev, mmc_irq, octeon_mmc_interrupt,
+ 0, DRV_NAME, host);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Error: devm_request_irq %d\n", mmc_irq);
+ goto err;
+ }
+
+ ret = devm_request_irq(&pdev->dev, dma_irq, octeon_mmc_dma_interrupt,
+ IRQF_SHARED, DRV_NAME, host);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Error: devm_request_irq %d\n", dma_irq);
+ goto err;
+ }
+
+
+ spin_lock_init(&host->lock);
+ sema_init(&host->mmc_serializer, 1);
+
+ platform_set_drvdata(pdev, host);
+
+ node = of_get_next_child(pdev->dev.of_node, NULL);
+ while (node) {
+ int size;
+ const __be32 *data;
+ found = 0;
+
+ data = of_get_property(node, "reg", &size);
+ if (data) {
+ enum of_gpio_flags f;
+ int ro_gpio, cd_gpio, power_gpio;
+ bool ro_low, cd_low, power_low;
+ int bus_width, max_freq;
+ int slot = be32_to_cpu(*data);
+ data = of_get_property(node,
+ "cavium,bus-max-width",
+ &size);
+ if (!data || size != 4) {
+ pr_info("Bus width not found for slot %d\n",
+ slot);
+ bus_width = 8;
+ } else {
+ bus_width = be32_to_cpup(data);
+ switch (bus_width) {
+ case 1:
+ case 4:
+ case 8:
+ break;
+ default:
+ bus_width = 8;
+ break;
+ }
+ }
+ data = of_get_property(node,
+ "spi-max-frequency",
+ &size);
+ if (!data || size != 4) {
+ max_freq = 52000000;
+ pr_info("no spi-max-frequency for slot %d, defautling to %d\n",
+ slot, max_freq);
+ } else {
+ max_freq = be32_to_cpup(data);
+ }
+
+ ro_gpio = of_get_named_gpio_flags(node, "wp-gpios", 0, &f);
+ ro_low = (ro_gpio >= 0 && f == OF_GPIO_ACTIVE_LOW);
+ cd_gpio = of_get_named_gpio_flags(node, "cd-gpios", 0, &f);
+ cd_low = (cd_gpio >= 0 && f == OF_GPIO_ACTIVE_LOW);
+ power_gpio = of_get_named_gpio_flags(node, "power-gpios", 0, &f);
+ power_low = (power_gpio >= 0 && f == OF_GPIO_ACTIVE_LOW);
+
+ ret = octeon_init_slot(host, slot, bus_width, max_freq,
+ ro_gpio, cd_gpio, power_gpio,
+ ro_low, cd_low, power_low);
+ pr_debug("init slot %d, ret = %d\n", slot, ret);
+ if (ret)
+ goto err;
+ }
+ node = of_get_next_child(pdev->dev.of_node, node);
+ }
+
+ return ret;
+
+err:
+ /* Disable MMC controller */
+ emm_cfg.s.bus_ena = 0;
+ cvmx_write_csr(host->base + OCT_MIO_EMM_CFG, emm_cfg.u64);
+ return ret;
+}
+
+static int __devexit octeon_mmc_remove(struct platform_device *pdev)
+{
+ union cvmx_mio_ndf_dma_int ndf_dma_int;
+ union cvmx_mio_ndf_dma_cfg ndf_dma_cfg;
+ struct octeon_mmc_host *host = platform_get_drvdata(pdev);
+
+ if (host) {
+ /* Reset bus_id */
+ 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);
+
+ /* Disable the interrupt */
+ ndf_dma_int.u64 = 0;
+ cvmx_write_csr(host->ndf_base + OCT_MIO_NDF_DMA_INT,
+ ndf_dma_int.u64);
+ }
+
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static struct of_device_id octeon_mmc_match[] = {
+ {
+ .compatible = "cavium,octeon-6130-mmc",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, octeon_mmc_match);
+
+static struct platform_driver octeon_mmc_driver = {
+ .probe = octeon_mmc_probe,
+ .remove = __devexit_p(octeon_mmc_remove),
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = octeon_mmc_match,
+ },
+};
+
+static int __init octeon_mmc_init(void)
+{
+ int ret;
+
+ pr_debug("calling octeon_mmc_init\n");
+
+ ret = platform_driver_register(&octeon_mmc_driver);
+ pr_debug("driver probe returned %d\n", ret);
+
+ if (ret)
+ pr_err("%s: Failed to register driver\n", DRV_NAME);
+
+ return ret;
+}
+
+static void __exit octeon_mmc_cleanup(void)
+{
+ /* Unregister MMC driver */
+ platform_driver_unregister(&octeon_mmc_driver);
+}
+
+module_init(octeon_mmc_init);
+module_exit(octeon_mmc_cleanup);
+
+MODULE_AUTHOR("Cavium Inc. <support@...iumn.com>");
+MODULE_DESCRIPTION("low-level driver for Cavium OCTEON MMC/SSD card");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
--
1.7.2.3
--
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