[PATCH 10/10] mmc: Add OpenFirmware bindings for SDHCI driver
Anton Vorontsov
avorontsov at ru.mvista.com
Thu Jan 22 13:00:41 EST 2009
This patch adds a new driver: sdhci-of. The driver is similar to
the sdhci-pci, it contains common probe code, and controller-specific
ops and quirks.
So far there are only Freescale eSDHC ops and quirks.
Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>
---
drivers/mmc/host/Kconfig | 10 ++
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sdhci-of.c | 274 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 285 insertions(+), 0 deletions(-)
create mode 100644 drivers/mmc/host/sdhci-of.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index dfa585f..8b5cdef 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -65,6 +65,16 @@ config MMC_RICOH_MMC
If unsure, say Y.
+config MMC_SDHCI_OF
+ tristate "SDHCI support on OpenFirmware platforms"
+ depends on MMC_SDHCI && PPC_OF
+ help
+ This selects the OF Secure Digital Host Controller Interface.
+ So far there is only Freescale eSDHC controller known to exists
+ on OF platforms.
+
+ 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 f485328..5296793 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_MMC_IMX) += imxmmc.o
obj-$(CONFIG_MMC_SDHCI) += sdhci.o
obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o
obj-$(CONFIG_MMC_RICOH_MMC) += ricoh_mmc.o
+obj-$(CONFIG_MMC_SDHCI_OF) += sdhci-of.o
obj-$(CONFIG_MMC_WBSD) += wbsd.o
obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
obj-$(CONFIG_MMC_OMAP) += omap.o
diff --git a/drivers/mmc/host/sdhci-of.c b/drivers/mmc/host/sdhci-of.c
new file mode 100644
index 0000000..8ee89a1
--- /dev/null
+++ b/drivers/mmc/host/sdhci-of.c
@@ -0,0 +1,274 @@
+/*
+ * OpenFirmware bindings for Secure Digital Host Controller Interface.
+ *
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ * Copyright (c) 2009 MontaVista Software, Inc.
+ *
+ * Authors: Xiaobo Xie <X.Xie at freescale.com>
+ * Anton Vorontsov <avorontsov at ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/mmc/host.h>
+#include "sdhci.h"
+
+struct sdhci_of_data {
+ unsigned int quirks;
+ struct sdhci_ops ops;
+};
+
+/*
+ * Ops and quirks for the Freescale eSDHC controller.
+ */
+
+#define ESDHC_DMA_SYSCTL 0x40c
+#define ESDHC_DMA_SNOOP 0x00000040
+
+#define ESDHC_SYSTEM_CONTROL 0x2c
+#define ESDHC_CLOCK_MASK 0x0000fff0
+#define ESDHC_PREDIV_SHIFT 8
+#define ESDHC_DIVIDER_SHIFT 4
+#define ESDHC_CLOCK_PEREN 0x00000004
+#define ESDHC_CLOCK_HCKEN 0x00000002
+#define ESDHC_CLOCK_IPGEN 0x00000001
+
+static u32 esdhc_readl(struct sdhci_host *host, int reg)
+{
+ return in_be32(host->ioaddr + reg);
+}
+
+static u16 esdhc_readw(struct sdhci_host *host, int reg)
+{
+ return in_be16(host->ioaddr + (reg ^ 0x2));
+}
+
+static u8 esdhc_readb(struct sdhci_host *host, int reg)
+{
+ return in_8(host->ioaddr + (reg ^ 0x3));
+}
+
+static void esdhc_writel(struct sdhci_host *host, int reg, u32 val)
+{
+ out_be32(host->ioaddr + reg, val);
+}
+
+static void esdhc_writew(struct sdhci_host *host, int reg, u16 val)
+{
+ int base = reg & ~0x3;
+ int shift = (reg & 0x2) * 8;
+
+ clrsetbits_be32(host->ioaddr + base, 0xffff << shift, val << shift);
+}
+
+static void esdhc_writeb(struct sdhci_host *host, int reg, u8 val)
+{
+ int base = reg & ~0x3;
+ int shift = (reg & 0x3) * 8;
+
+ clrsetbits_be32(host->ioaddr + base , 0xff << shift, val << shift);
+}
+
+static void esdhc_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+ int div;
+ int pre_div = 1;
+
+ setbits32(host->ioaddr + ESDHC_SYSTEM_CONTROL, ESDHC_CLOCK_IPGEN |
+ ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN);
+
+ clrbits32(host->ioaddr + ESDHC_SYSTEM_CONTROL, ESDHC_CLOCK_MASK);
+
+ if (clock == 0)
+ goto out;
+
+ if (host->max_clk / 16 > clock) {
+ for (; pre_div < 256; pre_div *= 2) {
+ if (host->max_clk / pre_div < clock*16)
+ break;
+ }
+ }
+
+ for (div = 1; div <= 16; div++) {
+ if (host->max_clk / (div * pre_div) <= clock)
+ break;
+ }
+
+ pre_div >>= 1;
+ div -= 1;
+
+ setbits32(host->ioaddr + ESDHC_SYSTEM_CONTROL,
+ div << ESDHC_DIVIDER_SHIFT | pre_div << ESDHC_PREDIV_SHIFT);
+ mdelay(10);
+out:
+ host->clock = clock;
+}
+
+static int esdhc_enable_dma(struct sdhci_host *host)
+{
+ setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
+ return 0;
+}
+
+static struct sdhci_of_data sdhci_esdhc = {
+ .quirks = SDHCI_QUIRK_FSL |
+ SDHCI_QUIRK_32BIT_REGISTERS |
+ SDHCI_QUIRK_PIO_IRQS_DURING_DMA |
+ SDHCI_QUIRK_BROKEN_CARD_DETECTION |
+ SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
+ SDHCI_QUIRK_NO_BUSY_IRQ |
+ SDHCI_QUIRK_NO_CARD_NO_RESET,
+ .ops = {
+ .readl = esdhc_readl,
+ .readw = esdhc_readw,
+ .readb = esdhc_readb,
+ .writel = esdhc_writel,
+ .writew = esdhc_writew,
+ .writeb = esdhc_writeb,
+ .set_clock = esdhc_set_clock,
+ .enable_dma = esdhc_enable_dma,
+ },
+};
+
+#ifdef CONFIG_PM
+
+static int sdhci_of_suspend(struct of_device *ofdev, pm_message_t state)
+{
+ struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
+
+ return mmc_suspend_host(host->mmc, state);
+}
+
+static int sdhci_of_resume(struct of_device *ofdev)
+{
+ struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
+
+ return mmc_resume_host(host->mmc);
+}
+
+#else
+
+#define sdhci_of_suspend NULL
+#define sdhci_of_resume NULL
+
+#endif
+
+static int __devinit sdhci_of_probe(struct of_device *ofdev,
+ const struct of_device_id *match)
+{
+ struct device_node *np = ofdev->node;
+ struct sdhci_of_data *sdhci_of_data = match->data;
+ struct sdhci_host *host;
+ struct resource mem;
+ const u32 *clk;
+ int size;
+ int ret;
+
+ host = sdhci_alloc_host(&ofdev->dev, sizeof(*host));
+ if (!host)
+ return -ENOMEM;
+
+ dev_set_drvdata(&ofdev->dev, host);
+
+ ret = of_address_to_resource(np, 0, &mem);
+ if (ret)
+ goto err_no_addr;
+
+ host->ioaddr = ioremap(mem.start, resource_size(&mem));
+ if (!host->ioaddr) {
+ ret = -ENOMEM;
+ goto err_addr_map;
+ }
+
+ host->irq = irq_of_parse_and_map(np, 0);
+ if (!host->irq) {
+ ret = -EINVAL;
+ goto err_no_irq;
+ }
+
+ host->hw_name = dev_name(&ofdev->dev);
+ if (sdhci_of_data) {
+ host->quirks = sdhci_of_data->quirks;
+ host->ops = &sdhci_of_data->ops;
+ }
+
+ clk = of_get_property(np, "clock-frequency", &size);
+ if (clk && size == sizeof(*clk) && *clk) {
+ host->max_clk = *clk;
+ host->timeout_clk = *clk / 1000;
+ }
+
+ ret = sdhci_add_host(host);
+ if (ret)
+ goto err_add_host;
+
+ return 0;
+
+err_add_host:
+ irq_dispose_mapping(host->irq);
+err_no_irq:
+ iounmap(host->ioaddr);
+err_addr_map:
+err_no_addr:
+ sdhci_free_host(host);
+ return ret;
+}
+
+static int __devexit sdhci_of_remove(struct of_device *ofdev)
+{
+ struct sdhci_host *host = dev_get_drvdata(&ofdev->dev);
+
+ sdhci_remove_host(host, 0);
+ sdhci_free_host(host);
+ irq_dispose_mapping(host->irq);
+ iounmap(host->ioaddr);
+ return 0;
+}
+
+static const struct of_device_id sdhci_of_match[] = {
+ {
+ .compatible = "fsl,esdhc",
+ .data = &sdhci_esdhc,
+ },
+ {
+ .compatible = "generic-sdhci",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sdhci_of_match);
+
+static struct of_platform_driver sdhci_of_driver = {
+ .driver.name = "sdhci-of",
+ .match_table = sdhci_of_match,
+ .probe = sdhci_of_probe,
+ .remove = __devexit_p(sdhci_of_remove),
+ .suspend = sdhci_of_suspend,
+ .resume = sdhci_of_resume,
+};
+
+static int __init sdhci_of_init(void)
+{
+ return of_register_platform_driver(&sdhci_of_driver);
+}
+module_init(sdhci_of_init);
+
+static void __exit sdhci_of_exit(void)
+{
+ of_unregister_platform_driver(&sdhci_of_driver);
+}
+module_exit(sdhci_of_exit);
+
+MODULE_DESCRIPTION("Secure Digital Host Controller Interface OF driver");
+MODULE_AUTHOR("Xiaobo Xie <X.Xie at freescale.com>, "
+ "Anton Vorontsov <avorontsov at ru.mvista.com>");
+MODULE_LICENSE("GPL");
--
1.5.6.5
More information about the Linuxppc-dev
mailing list