[PATCH v12 6/9] mmc: cavium: Add MMC PCI driver for ThunderX SOCs

Jan Glauber
2017-03-10T13:25:04Z

Add a platform driver for ThunderX ARM SOCs.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
---
drivers/mmc/host/Kconfig | 10 ++
drivers/mmc/host/Makefile | 2 +
drivers/mmc/host/cavium-mmc.h | 10 +-
drivers/mmc/host/cavium-pci-thunderx.c | 198 +++++++++++++++++++++++++++++++++
4 files changed, 218 insertions(+), 2 deletions(-)
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 4b22432..fb82aee 100644
--- a/drivers/mmc/host/cavium-mmc.h
+++ b/drivers/mmc/host/cavium-mmc.h
@@ -22,8 +22,12 @@
#define CAVIUM_MAX_MMC 4

/* DMA register addresses */
-#define MIO_EMM_DMA_CFG(x) (0x00 + x->reg_off_dma)
-#define MIO_EMM_DMA_ADR(x) (0x08 + x->reg_off_dma)
+#define MIO_EMM_DMA_CFG(x) (0x20 + x->reg_off_dma)
+#define MIO_EMM_DMA_ADR(x) (0x28 + x->reg_off_dma)
+#define MIO_EMM_DMA_INT(x) (0x30 + x->reg_off_dma)
+#define MIO_EMM_DMA_INT_W1S(x) (0x38 + x->reg_off_dma)
+#define MIO_EMM_DMA_INT_ENA_W1S(x) (0x40 + x->reg_off_dma)
+#define MIO_EMM_DMA_INT_ENA_W1C(x) (0x48 + x->reg_off_dma)

/* register addresses */
#define MIO_EMM_CFG(x) (0x00 + x->reg_off)
@@ -39,6 +43,8 @@
#define MIO_EMM_SAMPLE(x) (0x90 + x->reg_off)
#define MIO_EMM_STS_MASK(x) (0x98 + x->reg_off)
#define MIO_EMM_RCA(x) (0xa0 + x->reg_off)
+#define MIO_EMM_INT_EN_SET(x) (0xb0 + x->reg_off)
+#define MIO_EMM_INT_EN_CLR(x) (0xb8 + x->reg_off)
#define MIO_EMM_BUF_IDX(x) (0xe0 + x->reg_off)
#define MIO_EMM_BUF_DAT(x) (0xe8 + x->reg_off)

diff --git a/drivers/mmc/host/cavium-pci-thunderx.c b/drivers/mmc/host/cavium-pci-thunderx.c
new file mode 100644
index 0000000..6ad36b4
--- /dev/null
+++ b/drivers/mmc/host/cavium-pci-thunderx.c
@@ -0,0 +1,198 @@
+/*
+ * 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 <linux/pci.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(host));
+ writeq(val, host->base + MIO_EMM_INT_EN_SET(host));
+}
+
+static int thunder_mmc_register_interrupts(struct cvm_mmc_host *host,
+ struct pci_dev *pdev)
+{
+ int nvec, ret, i;
+
+ nvec = pci_alloc_irq_vectors(pdev, 1, 9, PCI_IRQ_MSIX);
+ if (nvec < 0)
+ return nvec;
+
+ /* register interrupts */
+ for (i = 0; i < nvec; i++) {
+ ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i),
+ cvm_mmc_interrupt,
+ 0, cvm_mmc_irq_names[i], 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->reg_off = 0x2000;
+ host->reg_off_dma = 0x160;
+
+ 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(host));
+ writeq(3, host->base + MIO_EMM_DMA_INT_ENA_W1C(host));
+
+ 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_of_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);
+ u64 dma_cfg;
+ int i;
+
+ for (i = 0; i < CAVIUM_MAX_MMC; i++)
+ if (host->slot[i]) {
+ cvm_mmc_of_slot_remove(host->slot[i]);
+ platform_device_del(slot_pdev[i]);
+ }
+
+ dma_cfg = readq(host->dma_base + MIO_EMM_DMA_CFG(host));
+ dma_cfg &= ~MIO_EMM_DMA_CFG_EN;
+ writeq(dma_cfg, host->dma_base + MIO_EMM_DMA_CFG(host));
+
+ 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