[PATCH v11 6/9] mmc: cavium: Add MMC PCI driver for ThunderX SOCs

Jan Glauber
2017-02-06T13:42:43Z

Add a platform driver for ThunderX ARM SOCs.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Steven J. Hill <steven.hill@cavium.com>
---
drivers/mmc/host/Kconfig | 10 ++
drivers/mmc/host/Makefile | 2 +
drivers/mmc/host/cavium-mmc.h | 38 ++++++
drivers/mmc/host/cavium-pci-thunderx.c | 203 +++++++++++++++++++++++++++++++++
4 files changed, 253 insertions(+)
create mode 100644 drivers/mmc/host/cavium-pci-thunderx.c

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 68cc811..3983dee 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -632,6 +632,16 @@ config MMC_CAVIUM_OCTEON

If unsure, say N.

+config MMC_CAVIUM_THUNDERX
+ tristate "Cavium ThunderX SD/MMC Card Interface support"
+ depends on PCI && 64BIT && (ARM64 || COMPILE_TEST)
+ select GPIO_THUNDERX
+ help
+ This selects Cavium ThunderX SD/MMC Card Interface.
+ If you have an Cavium ARM64 board with a Multimedia Card slot
+ or builtin eMMC chip say Y or M here. If built as a module
+ the module will be called thunderx_mmc.ko.
+
config MMC_DW
tristate "Synopsys DesignWare Memory Card Interface"
depends on HAS_DMA
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index c7f0ccf..0068610 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -44,6 +44,8 @@ obj-$(CONFIG_MMC_VIA_SDMMC) += via-sdmmc.o
obj-$(CONFIG_SDH_BFIN) += bfin_sdh.o
octeon-mmc-objs := cavium-mmc.o cavium-pltfm-octeon.o
obj-$(CONFIG_MMC_CAVIUM_OCTEON) += octeon-mmc.o
+thunderx-mmc-objs := cavium-mmc.o cavium-pci-thunderx.o
+obj-$(CONFIG_MMC_CAVIUM_THUNDERX) += thunderx-mmc.o
obj-$(CONFIG_MMC_DW) += dw_mmc.o
obj-$(CONFIG_MMC_DW_PLTFM) += dw_mmc-pltfm.o
obj-$(CONFIG_MMC_DW_EXYNOS) += dw_mmc-exynos.o
diff --git a/drivers/mmc/host/cavium-mmc.h b/drivers/mmc/host/cavium-mmc.h
index 5f41be9..64a837c 100644
--- a/drivers/mmc/host/cavium-mmc.h
+++ b/drivers/mmc/host/cavium-mmc.h
@@ -11,11 +11,14 @@
#include <linux/io.h>
#include <linux/mmc/host.h>
#include <linux/of.h>
+#include <linux/pci.h>
#include <linux/scatterlist.h>
#include <linux/semaphore.h>

#define CAVIUM_MAX_MMC 4

+#if IS_ENABLED(CONFIG_MMC_CAVIUM_OCTEON)
+
#define MIO_EMM_DMA_CFG 0x00
#define MIO_EMM_DMA_ADR 0x08

@@ -35,6 +38,36 @@
#define MIO_EMM_BUF_IDX 0xe0
#define MIO_EMM_BUF_DAT 0xe8

+#elif CONFIG_MMC_CAVIUM_THUNDERX
+
+#define MIO_EMM_DMA_CFG 0x180
+#define MIO_EMM_DMA_ADR 0x188
+#define MIO_EMM_DMA_INT 0x190
+#define MIO_EMM_DMA_INT_W1S 0x198
+#define MIO_EMM_DMA_INT_ENA_W1S 0x1a0
+#define MIO_EMM_DMA_INT_ENA_W1C 0x1a8
+
+#define MIO_EMM_CFG 0x2000
+#define MIO_EMM_SWITCH 0x2048
+#define MIO_EMM_DMA 0x2050
+#define MIO_EMM_CMD 0x2058
+#define MIO_EMM_RSP_STS 0x2060
+#define MIO_EMM_RSP_LO 0x2068
+#define MIO_EMM_RSP_HI 0x2070
+#define MIO_EMM_INT 0x2078
+#define MIO_EMM_INT_EN 0x2080
+#define MIO_EMM_WDOG 0x2088
+#define MIO_EMM_SAMPLE 0x2090
+#define MIO_EMM_STS_MASK 0x2098
+#define MIO_EMM_RCA 0x20a0
+#define MIO_EMM_BUF_IDX 0x20e0
+#define MIO_EMM_BUF_DAT 0x20e8
+
+#define MIO_EMM_INT_EN_SET 0x20b0
+#define MIO_EMM_INT_EN_CLR 0x20b8
+
+#endif
+
struct cvm_mmc_host {
struct device *dev;
void __iomem *base;
@@ -66,6 +99,11 @@ struct cvm_mmc_host {
void (*dmar_fixup)(struct cvm_mmc_host *, struct mmc_command *,
struct mmc_data *, u64);
void (*dmar_fixup_done)(struct cvm_mmc_host *);
+
+#if IS_ENABLED(CONFIG_MMC_CAVIUM_THUNDERX)
+ struct msix_entry *mmc_msix;
+ unsigned int msix_count;
+#endif
};

struct cvm_mmc_slot {
diff --git a/drivers/mmc/host/cavium-pci-thunderx.c b/drivers/mmc/host/cavium-pci-thunderx.c
new file mode 100644
index 0000000..5052c4e
--- /dev/null
+++ b/drivers/mmc/host/cavium-pci-thunderx.c
@@ -0,0 +1,203 @@
+/*
+ * Driver for MMC and SSD cards for Cavium ThunderX 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) 2016 Cavium Inc.
+ */
+#include <linux/dma-mapping.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include "cavium-mmc.h"
+
+struct platform_device *slot_pdev[2];
+
+static void thunder_mmc_acquire_bus(struct cvm_mmc_host *host)
+{
+ down(&host->mmc_serializer);
+}
+
+static void thunder_mmc_release_bus(struct cvm_mmc_host *host)
+{
+ up(&host->mmc_serializer);
+}
+
+static void thunder_mmc_int_enable(struct cvm_mmc_host *host, u64 val)
+{
+ writeq(val, host->base + MIO_EMM_INT);
+ writeq(val, host->base + MIO_EMM_INT_EN_SET);
+}
+
+static int thunder_mmc_register_interrupts(struct cvm_mmc_host *host,
+ struct pci_dev *pdev)
+{
+ int ret, i;
+
+ host->msix_count = pci_msix_vec_count(pdev);
+ host->mmc_msix = devm_kzalloc(&pdev->dev,
+ (sizeof(struct msix_entry)) * host->msix_count, GFP_KERNEL);
+ if (!host->mmc_msix)
+ return -ENOMEM;
+
+ for (i = 0; i < host->msix_count; i++)
+ host->mmc_msix[i].entry = i;
+
+ ret = pci_enable_msix(pdev, host->mmc_msix, host->msix_count);
+ if (ret)
+ return ret;
+
+ /* register interrupts */
+ for (i = 0; i < host->msix_count; i++) {
+ ret = devm_request_irq(&pdev->dev, host->mmc_msix[i].vector,
+ cvm_mmc_interrupt,
+ 0, KBUILD_MODNAME, host);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static int thunder_mmc_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct device_node *child_node;
+ struct cvm_mmc_host *host;
+ int ret, i = 0;
+
+ host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return -ENOMEM;
+
+ pci_set_drvdata(pdev, host);
+ ret = pcim_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ ret = pci_request_regions(pdev, KBUILD_MODNAME);
+ if (ret)
+ return ret;
+
+ host->base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
+ if (!host->base)
+ return -EINVAL;
+
+ /* On ThunderX these are identical */
+ host->dma_base = host->base;
+
+ host->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(host->clk))
+ return PTR_ERR(host->clk);
+
+ ret = clk_prepare_enable(host->clk);
+ if (ret)
+ return ret;
+ host->sys_freq = clk_get_rate(host->clk);
+
+ spin_lock_init(&host->irq_handler_lock);
+ sema_init(&host->mmc_serializer, 1);
+
+ host->dev = dev;
+ host->acquire_bus = thunder_mmc_acquire_bus;
+ host->release_bus = thunder_mmc_release_bus;
+ host->int_enable = thunder_mmc_int_enable;
+
+ host->big_dma_addr = true;
+ host->need_irq_handler_lock = true;
+ host->last_slot = -1;
+
+ ret = dma_set_mask(dev, DMA_BIT_MASK(48));
+ if (ret)
+ goto error;
+
+ /*
+ * Clear out any pending interrupts that may be left over from
+ * bootloader. Writing 1 to the bits clears them.
+ */
+ writeq(127, host->base + MIO_EMM_INT_EN);
+ writeq(3, host->base + MIO_EMM_DMA_INT_ENA_W1C);
+
+ ret = thunder_mmc_register_interrupts(host, pdev);
+ if (ret)
+ goto error;
+
+ for_each_child_of_node(node, child_node) {
+ /*
+ * TODO: mmc_of_parse and devm* require one device per slot.
+ * Create a dummy device per slot and set the node pointer to
+ * the slot. The easiest way to get this is using
+ * of_platform_device_create.
+ */
+ if (!slot_pdev[i])
+ slot_pdev[i] = of_platform_device_create(child_node, NULL,
+ &pdev->dev);
+ if (!slot_pdev[i])
+ continue;
+ ret = cvm_mmc_slot_probe(&slot_pdev[i]->dev, host);
+ if (ret)
+ goto error;
+ i++;
+ }
+ dev_info(dev, "probed\n");
+ return 0;
+
+error:
+ clk_disable_unprepare(host->clk);
+ return ret;
+}
+
+static void thunder_mmc_remove(struct pci_dev *pdev)
+{
+ struct cvm_mmc_host *host = pci_get_drvdata(pdev);
+ union mio_emm_dma_cfg dma_cfg;
+ int i;
+
+ for (i = 0; i < CAVIUM_MAX_MMC; i++)
+ if (host->slot[i]) {
+ cvm_mmc_slot_remove(host->slot[i]);
+ platform_device_del(slot_pdev[i]);
+ }
+
+ dma_cfg.val = readq(host->dma_base + MIO_EMM_DMA_CFG);
+ dma_cfg.s.en = 0;
+ writeq(dma_cfg.val, host->dma_base + MIO_EMM_DMA_CFG);
+
+ clk_disable_unprepare(host->clk);
+}
+
+static const struct pci_device_id thunder_mmc_id_table[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa010) },
+ { 0, } /* end of table */
+};
+
+static struct pci_driver thunder_mmc_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = thunder_mmc_id_table,
+ .probe = thunder_mmc_probe,
+ .remove = thunder_mmc_remove,
+};
+
+static int __init thunder_mmc_init_module(void)
+{
+ return pci_register_driver(&thunder_mmc_driver);
+}
+
+static void __exit thunder_mmc_exit_module(void)
+{
+ pci_unregister_driver(&thunder_mmc_driver);
+}
+
+module_init(thunder_mmc_init_module);
+module_exit(thunder_mmc_exit_module);
+
+MODULE_AUTHOR("Cavium Inc.");
+MODULE_DESCRIPTION("Cavium ThunderX eMMC Driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, thunder_mmc_id_table);
--
2.9.0.rc0.21.g7777322