[PATCH 2/3] mmc: sdhci-pxa: Add SDHCI driver for PXA16x
Tanmay Upadhyay
tanmay.upadhyay at einfochips.com
Tue Oct 25 08:37:09 EDT 2011
Signed-off-by: Philip Rakity <prakity at marvell.com>
Signed-off-by: Tanmay Upadhyay <tanmay.upadhyay at einfochips.com>
---
drivers/mmc/host/Kconfig | 13 ++
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sdhci-pxav1.c | 256 +++++++++++++++++++++++++++++++
drivers/mmc/host/sdhci.c | 3 +
drivers/mmc/host/sdhci.h | 1 +
include/linux/platform_data/pxa_sdhci.h | 1 +
6 files changed, 275 insertions(+), 0 deletions(-)
create mode 100644 drivers/mmc/host/sdhci-pxav1.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 8c87096..9c9b73a 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -207,6 +207,19 @@ config MMC_SDHCI_PXAV2
If unsure, say N.
+config MMC_SDHCI_PXAV1
+ tristate "Marvell PXA16X SD Host Controller support (PXAV1)"
+ depends on CLKDEV_LOOKUP
+ select MMC_SDHCI
+ select MMC_SDHCI_PLTFM
+ default CPU_PXA168
+ help
+ This selects the Marvell(R) PXAV1 SD Host Controller.
+ If you have a PXA16X platform with SD Host Controller
+ and a card slot, say Y or M here.
+
+ If unsure, say N.
+
config MMC_SDHCI_SPEAR
tristate "SDHCI support on ST SPEAr platform"
depends on MMC_SDHCI && PLAT_SPEAR
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index b4b83f3..5094af8 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_MMC_SDHCI) += sdhci.o
obj-$(CONFIG_MMC_SDHCI_PCI) += sdhci-pci.o
obj-$(CONFIG_MMC_SDHCI_PXAV3) += sdhci-pxav3.o
obj-$(CONFIG_MMC_SDHCI_PXAV2) += sdhci-pxav2.o
+obj-$(CONFIG_MMC_SDHCI_PXAV1) += sdhci-pxav1.o
obj-$(CONFIG_MMC_SDHCI_S3C) += sdhci-s3c.o
obj-$(CONFIG_MMC_SDHCI_SPEAR) += sdhci-spear.o
obj-$(CONFIG_MMC_WBSD) += wbsd.o
diff --git a/drivers/mmc/host/sdhci-pxav1.c b/drivers/mmc/host/sdhci-pxav1.c
new file mode 100644
index 0000000..a0f6285
--- /dev/null
+++ b/drivers/mmc/host/sdhci-pxav1.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright (C) 2011 Marvell International Ltd.
+ * Zhangfei Gao <zhangfei.gao at marvell.com>
+ * Kevin Wang <dwang4 at marvell.com>
+ * Jun Nie <njun at marvell.com>
+ * Qiming Wu <wuqm at marvell.com>
+ * Philip Rakity <prakity at marvell.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/platform_data/pxa_sdhci.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include "sdhci.h"
+#include "sdhci-pltfm.h"
+
+#define SD_FIFO_PARAM 0xe0
+#define DIS_PAD_SD_CLK_GATE 0x0400 /* Turn on/off Dynamic SD Clock Gating */
+#define CLK_GATE_SETTING_BITS DIS_PAD_SD_CLK_GATE
+
+#define SD_CLOCK_BURST_SIZE_SETUP 0xe6
+#define SDCLK_SEL_SHIFT 8
+#define SDCLK_SEL_MASK 0x3
+#define SDCLK_DELAY_SHIFT 10
+#define SDCLK_DELAY_MASK 0x3c
+
+#define SD_CE_ATA_2 0xea
+#define MMC_CARD 0x1000
+#define MMC_WIDTH 0x0100
+
+
+static void pxav1_set_private_registers(struct sdhci_host *host, u8 mask)
+{
+ struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
+ struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
+
+ if (mask == SDHCI_RESET_ALL) {
+ u16 tmp = 0;
+
+ /*
+ * tune timing of read data/command when crc error happen
+ * no performance impact
+ */
+ if (pdata && pdata->clk_delay_sel) {
+ tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
+
+ tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT);
+ tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
+ << SDCLK_DELAY_SHIFT;
+ tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT);
+ tmp |= (pdata->clk_delay_sel & SDCLK_SEL_MASK)
+ << SDCLK_SEL_SHIFT;
+
+ writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
+ }
+
+ /* no clock gating */
+ tmp = readw(host->ioaddr + SD_FIFO_PARAM);
+ tmp |= DIS_PAD_SD_CLK_GATE;
+ writew(tmp, host->ioaddr + SD_FIFO_PARAM);
+ }
+}
+
+static int pxav1_mmc_set_width(struct sdhci_host *host, int width)
+{
+ u8 ctrl;
+ u16 tmp;
+
+ ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
+ tmp = readw(host->ioaddr + SD_CE_ATA_2);
+ if (width == MMC_BUS_WIDTH_8) {
+ ctrl &= ~SDHCI_CTRL_4BITBUS;
+ tmp |= MMC_CARD | MMC_WIDTH;
+ } else {
+ tmp &= ~(MMC_CARD | MMC_WIDTH);
+ if (width == MMC_BUS_WIDTH_4)
+ ctrl |= SDHCI_CTRL_4BITBUS;
+ else
+ ctrl &= ~SDHCI_CTRL_4BITBUS;
+ }
+ writew(tmp, host->ioaddr + SD_CE_ATA_2);
+ writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
+
+ return 0;
+}
+
+static u32 pxav1_get_max_clock(struct sdhci_host *host)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+ return clk_get_rate(pltfm_host->clk);
+}
+
+/*
+ * we cannot talk to controller for 8 bus cycles according to sdio spec
+ * at lowest speed this is 100,000 HZ per cycle or 800,000 cycles
+ * which is quite a LONG TIME on a fast cpu -- so delay if needed
+ */
+static void platform_specific_completion(struct sdhci_host *host)
+{
+ struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
+ struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
+
+ if (host->clock < 3200000 && pdata && pdata->delay_in_ms)
+ mdelay(pdata->delay_in_ms);
+}
+
+
+static struct sdhci_ops pxav1_sdhci_ops = {
+ .get_max_clock = pxav1_get_max_clock,
+ .platform_reset_exit = pxav1_set_private_registers,
+ .platform_8bit_width = pxav1_mmc_set_width,
+ .platform_specific_completion = &platform_specific_completion,
+};
+
+static int __devinit sdhci_pxav1_probe(struct platform_device *pdev)
+{
+ struct sdhci_pltfm_host *pltfm_host;
+ struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
+ struct device *dev = &pdev->dev;
+ struct sdhci_host *host = NULL;
+ struct sdhci_pxa *pxa = NULL;
+ int ret;
+ struct clk *clk;
+
+ pxa = kzalloc(sizeof(struct sdhci_pxa), GFP_KERNEL);
+ if (!pxa)
+ return -ENOMEM;
+
+ host = sdhci_pltfm_init(pdev, NULL);
+ if (IS_ERR(host)) {
+ kfree(pxa);
+ return PTR_ERR(host);
+ }
+ pltfm_host = sdhci_priv(host);
+ pltfm_host->priv = pxa;
+
+ clk = clk_get(dev, "PXA-SDHCLK");
+ if (IS_ERR(clk)) {
+ dev_err(dev, "failed to get io clock\n");
+ ret = PTR_ERR(clk);
+ goto err_clk_get;
+ }
+ pltfm_host->clk = clk;
+ clk_enable(clk);
+
+ host->quirks = SDHCI_QUIRK_BROKEN_ADMA
+ | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
+ | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN
+ | SDHCI_QUIRK_NO_BUSY_IRQ
+ | SDHCI_QUIRK_32BIT_DMA_SIZE;
+
+ if (pdata) {
+ if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {
+ /* on-chip device */
+ host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
+ host->mmc->caps |= MMC_CAP_NONREMOVABLE;
+ }
+
+ /* If slot design supports 8 bit data, indicate this to MMC. */
+ if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
+ host->mmc->caps |= MMC_CAP_8_BIT_DATA;
+
+ if (pdata->quirks)
+ host->quirks |= pdata->quirks;
+ if (pdata->host_caps)
+ host->mmc->caps |= pdata->host_caps;
+ if (pdata->pm_caps)
+ host->mmc->pm_caps |= pdata->pm_caps;
+ }
+
+ host->ops = &pxav1_sdhci_ops;
+
+ ret = sdhci_add_host(host);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add host\n");
+ goto err_add_host;
+ }
+
+ platform_set_drvdata(pdev, host);
+
+ return 0;
+
+err_add_host:
+ clk_disable(clk);
+ clk_put(clk);
+err_clk_get:
+ sdhci_pltfm_free(pdev);
+ kfree(pxa);
+ return ret;
+}
+
+static int __devexit sdhci_pxav1_remove(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_pxa *pxa = pltfm_host->priv;
+
+ sdhci_remove_host(host, 1);
+
+ clk_disable(pltfm_host->clk);
+ clk_put(pltfm_host->clk);
+ sdhci_pltfm_free(pdev);
+ kfree(pxa);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver sdhci_pxav1_driver = {
+ .driver = {
+ .name = "sdhci-pxav1",
+ .owner = THIS_MODULE,
+ },
+ .probe = sdhci_pxav1_probe,
+ .remove = __devexit_p(sdhci_pxav1_remove),
+#ifdef CONFIG_PM
+ .suspend = sdhci_pltfm_suspend,
+ .resume = sdhci_pltfm_resume,
+#endif
+};
+static int __init sdhci_pxav1_init(void)
+{
+ return platform_driver_register(&sdhci_pxav1_driver);
+}
+
+static void __exit sdhci_pxav1_exit(void)
+{
+ platform_driver_unregister(&sdhci_pxav1_driver);
+}
+
+module_init(sdhci_pxav1_init);
+module_exit(sdhci_pxav1_exit);
+
+MODULE_DESCRIPTION("SDHCI driver for pxav1");
+MODULE_AUTHOR("Marvell International Ltd.");
+MODULE_LICENSE("GPL v2");
+
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 0e02cc1..26043aa 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -960,6 +960,9 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
mdelay(1);
}
+ if (host->ops->platform_specific_completion)
+ host->ops->platform_specific_completion(host);
+
mod_timer(&host->timer, jiffies + 10 * HZ);
host->cmd = cmd;
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 745c42f..363eebc 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -274,6 +274,7 @@ struct sdhci_ops {
void (*platform_reset_exit)(struct sdhci_host *host, u8 mask);
int (*set_uhs_signaling)(struct sdhci_host *host, unsigned int uhs);
+ void (*platform_specific_completion)(struct sdhci_host *host);
};
#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
diff --git a/include/linux/platform_data/pxa_sdhci.h b/include/linux/platform_data/pxa_sdhci.h
index 51ad099..b77f017 100644
--- a/include/linux/platform_data/pxa_sdhci.h
+++ b/include/linux/platform_data/pxa_sdhci.h
@@ -51,6 +51,7 @@ struct sdhci_pxa_platdata {
unsigned int host_caps;
unsigned int quirks;
unsigned int pm_caps;
+ unsigned int delay_in_ms;
};
struct sdhci_pxa {
--
1.6.3.3
More information about the linux-arm-kernel
mailing list