[PATCH V7 1/5] AHCI Add the AHCI SATA feature on the MX53 platforms
Sascha Hauer
s.hauer at pengutronix.de
Tue Sep 20 16:30:37 EDT 2011
On Wed, Aug 31, 2011 at 11:50:31AM +0800, Richard Zhu wrote:
> Signed-off-by: Richard Zhu <richard.zhu at linaro.org>
> Tested-By: Hector Oron Martinez <hector.oron at gmail.com>
> ---
> arch/arm/mach-mx5/clock-mx51-mx53.c | 19 ++++
> arch/arm/mach-mx5/devices-imx53.h | 4 +
> arch/arm/plat-mxc/Makefile | 1 +
> arch/arm/plat-mxc/ahci_sata.c | 104 +++++++++++++++++++++++
> arch/arm/plat-mxc/devices/Kconfig | 4 +
> arch/arm/plat-mxc/devices/Makefile | 1 +
> arch/arm/plat-mxc/devices/platform-ahci-imx.c | 66 ++++++++++++++
> arch/arm/plat-mxc/include/mach/ahci_sata.h | 33 +++++++
> arch/arm/plat-mxc/include/mach/devices-common.h | 10 ++
> 9 files changed, 242 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/plat-mxc/ahci_sata.c
> create mode 100644 arch/arm/plat-mxc/devices/platform-ahci-imx.c
> create mode 100644 arch/arm/plat-mxc/include/mach/ahci_sata.h
>
> diff --git a/arch/arm/mach-mx5/clock-mx51-mx53.c b/arch/arm/mach-mx5/clock-mx51-mx53.c
> index 7f20308..e1fadaf 100644
> --- a/arch/arm/mach-mx5/clock-mx51-mx53.c
> +++ b/arch/arm/mach-mx5/clock-mx51-mx53.c
> @@ -1397,6 +1397,22 @@ static struct clk esdhc4_mx53_clk = {
> .secondary = &esdhc4_ipg_clk,
> };
>
> diff --git a/arch/arm/plat-mxc/ahci_sata.c b/arch/arm/plat-mxc/ahci_sata.c
> new file mode 100644
> index 0000000..4f54816
> --- /dev/null
> +++ b/arch/arm/plat-mxc/ahci_sata.c
> @@ -0,0 +1,104 @@
> +/*
> + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
> + */
> +
> +/*
> + * 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.
> +
> + * 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.
> +
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + */
> +
> +#include <linux/io.h>
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/device.h>
> +#include <mach/ahci_sata.h>
> +
> +static struct clk *sata_clk, *sata_ref_clk;
These variables make the driver single instance only.
> +
> +/* AHCI module Initialization, if return 0, initialization is successful. */
> +int sata_init(struct device *dev, void __iomem *addr)
A global function with such a generic name is not a good idea.
Also I wonder how we want to convert this to devicetree when we
implement this as a platform specific hook. It should be done in the
driver.
> +{
> + u32 tmpdata;
> + int ret = 0;
> + struct clk *clk;
> +
> + sata_clk = clk_get(dev, "ahci");
> + if (IS_ERR(sata_clk)) {
> + dev_err(dev, "no sata clock.\n");
> + return PTR_ERR(sata_clk);
> + }
> + ret = clk_enable(sata_clk);
> + if (ret) {
> + dev_err(dev, "can't enable sata clock.\n");
> + goto put_sata_clk;
> + }
> +
> + /* FSL IMX AHCI SATA uses the internal usb phy1 clk on loco */
So this function is loco specific or is the comment wrong?
> + sata_ref_clk = clk_get(dev, "ahci_phy");
> + if (IS_ERR(sata_ref_clk)) {
> + dev_err(dev, "no sata ref clock.\n");
> + ret = PTR_ERR(sata_ref_clk);
> + goto release_sata_clk;
> + }
> + ret = clk_enable(sata_ref_clk);
> + if (ret) {
> + dev_err(dev, "can't enable sata ref clock.\n");
> + goto put_sata_ref_clk;
> + }
> +
> + /* Get the AHB clock rate, and configure the TIMER1MS reg later */
> + clk = clk_get(dev, "ahci_dma");
> + if (IS_ERR(clk)) {
> + dev_err(dev, "no dma clock.\n");
> + ret = PTR_ERR(clk);
> + goto release_sata_ref_clk;
> + }
> + tmpdata = clk_get_rate(clk) / 1000;
> + clk_put(clk);
> +
> + writel(tmpdata, addr + HOST_TIMER1MS);
> +
> + tmpdata = readl(addr + HOST_CAP);
> + if (!(tmpdata & HOST_CAP_SSS)) {
> + tmpdata |= HOST_CAP_SSS;
> + writel(tmpdata, addr + HOST_CAP);
> + }
> +
> + if (!(readl(addr + HOST_PORTS_IMPL) & 0x1))
> + writel((readl(addr + HOST_PORTS_IMPL) | 0x1),
> + addr + HOST_PORTS_IMPL);
> +
> + return 0;
> +
> +release_sata_ref_clk:
> + clk_disable(sata_ref_clk);
> +put_sata_ref_clk:
> + clk_put(sata_ref_clk);
> +release_sata_clk:
> + clk_disable(sata_clk);
> +put_sata_clk:
> + clk_put(sata_clk);
> +
> + return ret;
> +}
> +
> +void sata_exit(struct device *dev)
> +{
> + clk_disable(sata_ref_clk);
> + clk_put(sata_ref_clk);
> +
> + clk_disable(sata_clk);
> + clk_put(sata_clk);
> +
> +}
> diff --git a/arch/arm/plat-mxc/devices/Kconfig b/arch/arm/plat-mxc/devices/Kconfig
> index bd294ad..f63887b 100644
> --- a/arch/arm/plat-mxc/devices/Kconfig
> +++ b/arch/arm/plat-mxc/devices/Kconfig
> @@ -76,3 +76,7 @@ config IMX_HAVE_PLATFORM_SDHCI_ESDHC_IMX
>
> config IMX_HAVE_PLATFORM_SPI_IMX
> bool
> +
> +config IMX_HAVE_PLATFORM_AHCI
> + bool
> + default y if ARCH_MX53
> diff --git a/arch/arm/plat-mxc/devices/Makefile b/arch/arm/plat-mxc/devices/Makefile
> index b41bf97..e858ad9 100644
> --- a/arch/arm/plat-mxc/devices/Makefile
> +++ b/arch/arm/plat-mxc/devices/Makefile
> @@ -25,3 +25,4 @@ obj-$(CONFIG_IMX_HAVE_PLATFORM_MXC_RTC) += platform-mxc_rtc.o
> obj-$(CONFIG_IMX_HAVE_PLATFORM_MXC_W1) += platform-mxc_w1.o
> obj-$(CONFIG_IMX_HAVE_PLATFORM_SDHCI_ESDHC_IMX) += platform-sdhci-esdhc-imx.o
> obj-$(CONFIG_IMX_HAVE_PLATFORM_SPI_IMX) += platform-spi_imx.o
> +obj-$(CONFIG_IMX_HAVE_PLATFORM_AHCI) += platform-ahci-imx.o
> diff --git a/arch/arm/plat-mxc/devices/platform-ahci-imx.c b/arch/arm/plat-mxc/devices/platform-ahci-imx.c
> new file mode 100644
> index 0000000..9e1b460
> --- /dev/null
> +++ b/arch/arm/plat-mxc/devices/platform-ahci-imx.c
> @@ -0,0 +1,66 @@
> +/*
> + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
> + */
> +
> +/*
> + * 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.
> +
> + * 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.
> +
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + */
> +
> +#include <linux/dma-mapping.h>
> +#include <asm/sizes.h>
> +#include <mach/hardware.h>
> +#include <mach/devices-common.h>
> +#include <mach/ahci_sata.h>
> +
> +#define imx_ahci_imx_data_entry_single(soc, _devid) \
> + { \
> + .devid = _devid, \
> + .iobase = soc ## _SATA_BASE_ADDR, \
> + .irq = soc ## _INT_SATA, \
> + }
> +
> +#ifdef CONFIG_SOC_IMX53
> +const struct imx_ahci_imx_data imx53_ahci_imx_data __initconst =
> + imx_ahci_imx_data_entry_single(MX53, "imx53-ahci");
> +#endif
> +
> +static struct ahci_platform_data default_sata_pdata = {
> + .init = sata_init,
> + .exit = sata_exit,
> +};
> +
> +struct platform_device *__init imx_add_ahci_imx(
> + const struct imx_ahci_imx_data *data,
> + const struct ahci_platform_data *pdata)
> +{
> + struct resource res[] = {
> + {
> + .start = data->iobase,
> + .end = data->iobase + SZ_4K - 1,
> + .flags = IORESOURCE_MEM,
> + }, {
> + .start = data->irq,
> + .end = data->irq,
> + .flags = IORESOURCE_IRQ,
> + },
> + };
> +
> + if (pdata == NULL)
> + pdata = &default_sata_pdata;
> +
> + return imx_add_platform_device_dmamask(data->devid, 0,
> + res, ARRAY_SIZE(res),
> + pdata, sizeof(*pdata), DMA_BIT_MASK(32));
> +}
> diff --git a/arch/arm/plat-mxc/include/mach/ahci_sata.h b/arch/arm/plat-mxc/include/mach/ahci_sata.h
> new file mode 100644
> index 0000000..ba297e1
> --- /dev/null
> +++ b/arch/arm/plat-mxc/include/mach/ahci_sata.h
> @@ -0,0 +1,33 @@
> +/*
> + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
> + */
> +
> +/*
> + * 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.
> +
> + * 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.
> +
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + */
> +
> +#ifndef __PLAT_MXC_AHCI_SATA_H__
> +#define __PLAT_MXC_AHCI_SATA_H__
> +
> +enum {
> + HOST_CAP = 0x00,
> + HOST_CAP_SSS = (1 << 27), /* Staggered Spin-up */
> + HOST_PORTS_IMPL = 0x0c,
> + HOST_TIMER1MS = 0xe0, /* Timer 1-ms */
> +};
> +
> +extern int sata_init(struct device *dev, void __iomem *addr);
> +extern void sata_exit(struct device *dev);
> +#endif /* __PLAT_MXC_AHCI_SATA_H__ */
> diff --git a/arch/arm/plat-mxc/include/mach/devices-common.h b/arch/arm/plat-mxc/include/mach/devices-common.h
> index 524538a..f04e063 100644
> --- a/arch/arm/plat-mxc/include/mach/devices-common.h
> +++ b/arch/arm/plat-mxc/include/mach/devices-common.h
> @@ -301,3 +301,13 @@ struct platform_device *__init imx_add_spi_imx(
> struct platform_device *imx_add_imx_dma(void);
> struct platform_device *imx_add_imx_sdma(char *name,
> resource_size_t iobase, int irq, struct sdma_platform_data *pdata);
> +
> +#include <linux/ahci_platform.h>
> +struct imx_ahci_imx_data {
> + const char *devid;
> + resource_size_t iobase;
> + resource_size_t irq;
> +};
> +struct platform_device *__init imx_add_ahci_imx(
> + const struct imx_ahci_imx_data *data,
> + const struct ahci_platform_data *pdata);
> --
> 1.7.1
>
>
>
--
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