Re: [PATCH v5 12/14] mmc: sdhci-pic32: Add PIC32 SDHCI host controller driver

From: Ulf Hansson
Date: Mon Feb 08 2016 - 04:59:11 EST

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+ Adrian

On 14 January 2016 at 02:15, Joshua Henderson
<joshua.henderson@xxxxxxxxxxxxx> wrote:
> From: Andrei Pistirica <andrei.pistirica@xxxxxxxxxxxxx>
>
> This driver supports the SDHCI host controller found on a PIC32.
>
> Signed-off-by: Andrei Pistirica <andrei.pistirica@xxxxxxxxxxxxx>
> Signed-off-by: Joshua Henderson <joshua.henderson@xxxxxxxxxxxxx>
> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>

I have queued this up for next via my mmc tree.

Adrian, please tell me if you have any objections.

Thanks and kind regards!
Uffe

> ---
> Changes since v4: None
> Changes since v3: None
> Changes since v2:
> - Use 'sdhci_pltfm_*' instead of 'sdhci_*_host' and other cleanup
> Changes since v1:
> - Be consistent and use only "SDHCI" when referring to SD host
> controller
> - Remove unnecessary PIC32 sdhci_ops min clock function.
> - Drop usage of piomode and no-1-8-v DT properties
> - Formatting
> - Fix use of devm_iounmap
> - Address code comment
> ---
> drivers/mmc/host/Kconfig | 11 ++
> drivers/mmc/host/Makefile | 1 +
> drivers/mmc/host/sdhci-pic32.c | 257 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 269 insertions(+)
> create mode 100644 drivers/mmc/host/sdhci-pic32.c
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 1dee533..c6a8916 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -785,3 +785,14 @@ config MMC_MTK
> If you have a machine with a integrated SD/MMC card reader, say Y or M here.
> This is needed if support for any SD/SDIO/MMC devices is required.
> If unsure, say N.
> +
> +config MMC_SDHCI_MICROCHIP_PIC32
> + tristate "Microchip PIC32MZDA SDHCI support"
> + depends on MMC_SDHCI && PIC32MZDA && MMC_SDHCI_PLTFM
> + help
> + This selects the Secure Digital Host Controller Interface (SDHCI)
> + for PIC32MZDA platform.
> +
> + If you have a controller with this interface, say Y or M here.
> +
> + If unsure, say N.
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 3595f83..af918d2 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -75,6 +75,7 @@ obj-$(CONFIG_MMC_SDHCI_BCM2835) += sdhci-bcm2835.o
> obj-$(CONFIG_MMC_SDHCI_IPROC) += sdhci-iproc.o
> obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o
> obj-$(CONFIG_MMC_SDHCI_ST) += sdhci-st.o
> +obj-$(CONFIG_MMC_SDHCI_MICROCHIP_PIC32) += sdhci-pic32.o
>
> ifeq ($(CONFIG_CB710_DEBUG),y)
> CFLAGS-cb710-mmc += -DDEBUG
> diff --git a/drivers/mmc/host/sdhci-pic32.c b/drivers/mmc/host/sdhci-pic32.c
> new file mode 100644
> index 0000000..059df70
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-pic32.c
> @@ -0,0 +1,257 @@
> +/*
> + * Support of SDHCI platform devices for Microchip PIC32.
> + *
> + * Copyright (C) 2015 Microchip
> + * Andrei Pistirica, Paul Thacker
> + *
> + * Inspired by sdhci-pltfm.c
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/highmem.h>
> +#include <linux/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm.h>
> +#include <linux/slab.h>
> +#include <linux/mmc/host.h>
> +#include <linux/io.h>
> +#include "sdhci.h"
> +#include "sdhci-pltfm.h"
> +#include <linux/platform_data/sdhci-pic32.h>
> +
> +#define SDH_SHARED_BUS_CTRL 0x000000E0
> +#define SDH_SHARED_BUS_NR_CLK_PINS_MASK 0x7
> +#define SDH_SHARED_BUS_NR_IRQ_PINS_MASK 0x30
> +#define SDH_SHARED_BUS_CLK_PINS 0x10
> +#define SDH_SHARED_BUS_IRQ_PINS 0x14
> +#define SDH_CAPS_SDH_SLOT_TYPE_MASK 0xC0000000
> +#define SDH_SLOT_TYPE_REMOVABLE 0x0
> +#define SDH_SLOT_TYPE_EMBEDDED 0x1
> +#define SDH_SLOT_TYPE_SHARED_BUS 0x2
> +#define SDHCI_CTRL_CDSSEL 0x80
> +#define SDHCI_CTRL_CDTLVL 0x40
> +
> +#define ADMA_FIFO_RD_THSHLD 512
> +#define ADMA_FIFO_WR_THSHLD 512
> +
> +struct pic32_sdhci_priv {
> + struct platform_device *pdev;
> + struct clk *sys_clk;
> + struct clk *base_clk;
> +};
> +
> +static unsigned int pic32_sdhci_get_max_clock(struct sdhci_host *host)
> +{
> + struct pic32_sdhci_priv *sdhci_pdata = sdhci_priv(host);
> +
> + return clk_get_rate(sdhci_pdata->base_clk);
> +}
> +
> +static void pic32_sdhci_set_bus_width(struct sdhci_host *host, int width)
> +{
> + u8 ctrl;
> +
> + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> + if (width == MMC_BUS_WIDTH_8) {
> + ctrl &= ~SDHCI_CTRL_4BITBUS;
> + if (host->version >= SDHCI_SPEC_300)
> + ctrl |= SDHCI_CTRL_8BITBUS;
> + } else {
> + if (host->version >= SDHCI_SPEC_300)
> + ctrl &= ~SDHCI_CTRL_8BITBUS;
> + if (width == MMC_BUS_WIDTH_4)
> + ctrl |= SDHCI_CTRL_4BITBUS;
> + else
> + ctrl &= ~SDHCI_CTRL_4BITBUS;
> + }
> +
> + /* CD select and test bits must be set for errata workaround. */
> + ctrl &= ~SDHCI_CTRL_CDTLVL;
> + ctrl |= SDHCI_CTRL_CDSSEL;
> + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> +}
> +
> +static unsigned int pic32_sdhci_get_ro(struct sdhci_host *host)
> +{
> + /*
> + * The SDHCI_WRITE_PROTECT bit is unstable on current hardware so we
> + * can't depend on its value in any way.
> + */
> + return 0;
> +}
> +
> +static const struct sdhci_ops pic32_sdhci_ops = {
> + .get_max_clock = pic32_sdhci_get_max_clock,
> + .set_clock = sdhci_set_clock,
> + .set_bus_width = pic32_sdhci_set_bus_width,
> + .reset = sdhci_reset,
> + .set_uhs_signaling = sdhci_set_uhs_signaling,
> + .get_ro = pic32_sdhci_get_ro,
> +};
> +
> +static struct sdhci_pltfm_data sdhci_pic32_pdata = {
> + .ops = &pic32_sdhci_ops,
> + .quirks = SDHCI_QUIRK_NO_HISPD_BIT,
> + .quirks2 = SDHCI_QUIRK2_NO_1_8_V,
> +};
> +
> +static void pic32_sdhci_shared_bus(struct platform_device *pdev)
> +{
> + struct sdhci_host *host = platform_get_drvdata(pdev);
> + u32 bus = readl(host->ioaddr + SDH_SHARED_BUS_CTRL);
> + u32 clk_pins = (bus & SDH_SHARED_BUS_NR_CLK_PINS_MASK) >> 0;
> + u32 irq_pins = (bus & SDH_SHARED_BUS_NR_IRQ_PINS_MASK) >> 4;
> +
> + /* select first clock */
> + if (clk_pins & 1)
> + bus |= (1 << SDH_SHARED_BUS_CLK_PINS);
> +
> + /* select first interrupt */
> + if (irq_pins & 1)
> + bus |= (1 << SDH_SHARED_BUS_IRQ_PINS);
> +
> + writel(bus, host->ioaddr + SDH_SHARED_BUS_CTRL);
> +}
> +
> +static int pic32_sdhci_probe_platform(struct platform_device *pdev,
> + struct pic32_sdhci_priv *pdata)
> +{
> + int ret = 0;
> + u32 caps_slot_type;
> + struct sdhci_host *host = platform_get_drvdata(pdev);
> +
> + /* Check card slot connected on shared bus. */
> + host->caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
> + caps_slot_type = (host->caps & SDH_CAPS_SDH_SLOT_TYPE_MASK) >> 30;
> + if (caps_slot_type == SDH_SLOT_TYPE_SHARED_BUS)
> + pic32_sdhci_shared_bus(pdev);
> +
> + return ret;
> +}
> +
> +static int pic32_sdhci_probe(struct platform_device *pdev)
> +{
> + struct sdhci_host *host;
> + struct sdhci_pltfm_host *pltfm_host;
> + struct pic32_sdhci_priv *sdhci_pdata;
> + struct pic32_sdhci_platform_data *plat_data;
> + int ret;
> +
> + host = sdhci_pltfm_init(pdev, &sdhci_pic32_pdata,
> + sizeof(struct pic32_sdhci_priv));
> + if (IS_ERR(host)) {
> + ret = PTR_ERR(host);
> + goto err;
> + }
> +
> + pltfm_host = sdhci_priv(host);
> + sdhci_pdata = sdhci_pltfm_priv(pltfm_host);
> +
> + plat_data = pdev->dev.platform_data;
> + if (plat_data && plat_data->setup_dma) {
> + ret = plat_data->setup_dma(ADMA_FIFO_RD_THSHLD,
> + ADMA_FIFO_WR_THSHLD);
> + if (ret)
> + goto err_host;
> + }
> +
> + sdhci_pdata->sys_clk = devm_clk_get(&pdev->dev, "sys_clk");
> + if (IS_ERR(sdhci_pdata->sys_clk)) {
> + ret = PTR_ERR(sdhci_pdata->sys_clk);
> + dev_err(&pdev->dev, "Error getting clock\n");
> + goto err_host;
> + }
> +
> + ret = clk_prepare_enable(sdhci_pdata->sys_clk);
> + if (ret) {
> + dev_err(&pdev->dev, "Error enabling clock\n");
> + goto err_host;
> + }
> +
> + sdhci_pdata->base_clk = devm_clk_get(&pdev->dev, "base_clk");
> + if (IS_ERR(sdhci_pdata->base_clk)) {
> + ret = PTR_ERR(sdhci_pdata->base_clk);
> + dev_err(&pdev->dev, "Error getting clock\n");
> + goto err_sys_clk;
> + }
> +
> + ret = clk_prepare_enable(sdhci_pdata->base_clk);
> + if (ret) {
> + dev_err(&pdev->dev, "Error enabling clock\n");
> + goto err_base_clk;
> + }
> +
> + ret = mmc_of_parse(host->mmc);
> + if (ret)
> + goto err_base_clk;
> +
> + ret = pic32_sdhci_probe_platform(pdev, sdhci_pdata);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to probe platform!\n");
> + goto err_base_clk;
> + }
> +
> + ret = sdhci_add_host(host);
> + if (ret) {
> + dev_err(&pdev->dev, "error adding host\n");
> + goto err_base_clk;
> + }
> +
> + dev_info(&pdev->dev, "Successfully added sdhci host\n");
> + return 0;
> +
> +err_base_clk:
> + clk_disable_unprepare(sdhci_pdata->base_clk);
> +err_sys_clk:
> + clk_disable_unprepare(sdhci_pdata->sys_clk);
> +err_host:
> + sdhci_pltfm_free(pdev);
> +err:
> + dev_err(&pdev->dev, "pic32-sdhci probe failed: %d\n", ret);
> + return ret;
> +}
> +
> +static int pic32_sdhci_remove(struct platform_device *pdev)
> +{
> + struct sdhci_host *host = platform_get_drvdata(pdev);
> + struct pic32_sdhci_priv *sdhci_pdata = sdhci_priv(host);
> + u32 scratch;
> +
> + scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
> + sdhci_remove_host(host, scratch == (u32)~0);
> + clk_disable_unprepare(sdhci_pdata->base_clk);
> + clk_disable_unprepare(sdhci_pdata->sys_clk);
> + sdhci_pltfm_free(pdev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id pic32_sdhci_id_table[] = {
> + { .compatible = "microchip,pic32mzda-sdhci" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, pic32_sdhci_id_table);
> +
> +static struct platform_driver pic32_sdhci_driver = {
> + .driver = {
> + .name = "pic32-sdhci",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(pic32_sdhci_id_table),
> + },
> + .probe = pic32_sdhci_probe,
> + .remove = pic32_sdhci_remove,
> +};
> +
> +module_platform_driver(pic32_sdhci_driver);
> +
> +MODULE_DESCRIPTION("Microchip PIC32 SDHCI driver");
> +MODULE_AUTHOR("Pistirica Sorin Andrei & Sandeep Sheriker");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.9.5
>

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