[PATCH v12 3/9] mmc: cavium: Add MMC platform driver for Octeon SOCs

Jan Glauber
2017-03-10T13:25:01Z

Add a platform driver for Octeon MIPS 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-pltfm-octeon.c | 183 +++++++++++++++++++++++++++++++++
3 files changed, 195 insertions(+)
create mode 100644 drivers/mmc/host/cavium-pltfm-octeon.c

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index f08691a..68cc811 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -622,6 +622,16 @@ config SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
help
If you say yes here SD-Cards may work on the EZkit.

+config MMC_CAVIUM_OCTEON
+ tristate "Cavium OCTEON SD/MMC Card Interface support"
+ depends on CAVIUM_OCTEON_SOC
+ help
+ This selects Cavium OCTEON SD/MMC card Interface.
+ If you have an OCTEON board with a Multimedia Card slot,
+ say Y or M here.
+
+ If unsure, say N.
+
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 6d548c4..c7f0ccf 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -42,6 +42,8 @@ obj-$(CONFIG_MMC_SDHI) += sh_mobile_sdhi.o
obj-$(CONFIG_MMC_CB710) += cb710-mmc.o
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-$(CONFIG_MMC_CAVIUM_OCTEON) += octeon-mmc.o
obj-$(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-pltfm-octeon.c b/drivers/mmc/host/cavium-pltfm-octeon.c
new file mode 100644
index 0000000..e83d143
--- /dev/null
+++ b/drivers/mmc/host/cavium-pltfm-octeon.c
@@ -0,0 +1,183 @@
+/*
+ * 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) 2012-2017 Cavium Inc.
+ */
+#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 <asm/octeon/octeon.h>
+#include "cavium-mmc.h"
+
+#define CVMX_MIO_BOOT_CTL CVMX_ADD_IO_SEG(0x00011800000000D0ull)
+
+static void octeon_mmc_acquire_bus(struct cvm_mmc_host *host)
+{
+ /* Switch the MMC controller onto the bus. */
+ down(&octeon_bootbus_sem);
+ writeq(0, (void __iomem *)CVMX_MIO_BOOT_CTL);
+}
+
+static void octeon_mmc_release_bus(struct cvm_mmc_host *host)
+{
+ up(&octeon_bootbus_sem);
+}
+
+static void octeon_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(host));
+}
+
+static int octeon_mmc_probe(struct platform_device *pdev)
+{
+ struct device_node *cn, *node = pdev->dev.of_node;
+ struct cvm_mmc_host *host;
+ struct resource *res;
+ void __iomem *base;
+ int mmc_irq[9];
+ int i, ret = 0;
+ u64 val;
+
+ host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return -ENOMEM;
+
+ host->dev = &pdev->dev;
+ host->acquire_bus = octeon_mmc_acquire_bus;
+ host->release_bus = octeon_mmc_release_bus;
+ host->int_enable = octeon_mmc_int_enable;
+
+ host->sys_freq = octeon_get_io_clock_rate();
+
+ /* First one is EMM second 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;
+
+ 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 = (void __iomem *)base;
+ host->reg_off = 0;
+
+ 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->dma_base = (void __iomem *)base;
+ host->reg_off_dma = 0;
+
+ /*
+ * Clear out any pending interrupts that may be left over from
+ * bootloader.
+ */
+ val = readq(host->base + MIO_EMM_INT(host));
+ writeq(val, host->base + MIO_EMM_INT(host));
+
+ ret = devm_request_irq(&pdev->dev, mmc_irq[0],
+ cvm_mmc_interrupt, 0, KBUILD_MODNAME, 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(&pdev->dev, "Invalid power GPIO\n");
+ return PTR_ERR(host->global_pwr_gpiod);
+ }
+
+ platform_set_drvdata(pdev, host);
+
+ for_each_child_of_node(node, cn) {
+ struct platform_device *slot_pdev;
+
+ slot_pdev = of_platform_device_create(cn, NULL, &pdev->dev);
+ ret = cvm_mmc_of_slot_probe(&slot_pdev->dev, host);
+ if (ret) {
+ dev_err(&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)
+{
+ struct cvm_mmc_host *host = platform_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]);
+
+ 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));
+
+ 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 = KBUILD_MODNAME,
+ .of_match_table = octeon_mmc_match,
+ },
+};
+
+static int __init octeon_mmc_init(void)
+{
+ return platform_driver_register(&octeon_mmc_driver);
+}
+
+static void __exit octeon_mmc_cleanup(void)
+{
+ 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");
--
2.9.0.rc0.21.g7777322