On Mon, Mar 14, 2011 at 05:55:44PM +0800, Richard Zhu wrote:
> Signed-off-by: Richard Zhu <Hong-Xing.Zhu@xxxxxxxxxxxxx>
> ---
> arch/arm/mach-mx5/board-mx53_loco.c | 120 +++++++++++++++++++++++++++++++++++
> 1 files changed, 120 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-mx5/board-mx53_loco.c b/arch/arm/mach-mx5/board-mx53_loco.c
> index 0a18f8d..9a7bbea 100644
> --- a/arch/arm/mach-mx5/board-mx53_loco.c
> +++ b/arch/arm/mach-mx5/board-mx53_loco.c
> @@ -23,11 +23,13 @@
> #include <linux/fec.h>
> #include <linux/delay.h>
> #include <linux/gpio.h>
> +#include <linux/ahci_platform.h>
>
> #include <mach/common.h>
> #include <mach/hardware.h>
> #include <mach/imx-uart.h>
> #include <mach/iomux-mx53.h>
> +#include <mach/ahci_sata.h>
>
> #include <asm/mach-types.h>
> #include <asm/mach/arch.h>
> @@ -203,6 +205,123 @@ static const struct imxi2c_platform_data mx53_loco_i2c_data __initconst = {
> .bitrate = 100000,
> };
>
> +/* HW Initialization, if return 0, initialization is successful. */
> +static int sata_init(struct device *dev, void __iomem *addr)
> +{
> + void __iomem *mmio;
> + struct clk *clk;
> + int ret = 0;
> + u32 tmpdata;
> +
> + clk = clk_get(dev, "imx_sata_clk");
> + ret = IS_ERR(clk);
> + if (ret) {
> + printk(KERN_ERR "IMX AHCI can't get clock.\n");
> + return ret;
> + }
IS_ERR returns 0 or 1 which is not a valid return value here.
> + ret = clk_enable(clk);
> + if (ret) {
> + printk(KERN_ERR "IMX AHCI can't enable clock.\n");
You have a struct device *, so you should use dev_err.
> + clk_put(clk);
> + return ret;
> + }
> +
> + /* FSL IMX AHCI SATA uses the internal usb phy1 clk on loco */
> + clk = clk_get(dev, "usb_phy1");
> + ret = IS_ERR(clk);
> + if (ret) {
> + printk(KERN_ERR "IMX AHCI can't get USB PHY1 CLK.\n");
> + goto no_input_clk;
> + }
> + ret = clk_enable(clk);
> + if (ret) {
> + printk(KERN_ERR "IMX AHCI Can't enable USB PHY1 clock.\n");
> + clk_put(clk);
> + goto no_input_clk;
> + }
> +
> + /* Get the AHB clock rate, and configure the TIMER1MS reg later */
> + clk = clk_get(NULL, "ahb_clk");
> + ret = IS_ERR(clk);
> + if (ret) {
> + printk(KERN_ERR "IMX AHCI can't get AHB clock.\n");
> + goto no_clk;
> + }
> +
> + mmio = ioremap(MX53_SATA_BASE_ADDR, SZ_2K);
> + if (mmio == NULL) {
> + printk(KERN_ERR "Failed to map SATA REGS\n");
> + goto no_clk;
> + }
> +
> + tmpdata = readl(mmio + HOST_CAP);
> + if (!(tmpdata & HOST_CAP_SSS)) {
> + tmpdata |= HOST_CAP_SSS;
> + writel(tmpdata, mmio + HOST_CAP);
> + }
> +
> + if (!(readl(mmio + HOST_PORTS_IMPL) & 0x1))
> + writel((readl(mmio + HOST_PORTS_IMPL) | 0x1),
> + mmio + HOST_PORTS_IMPL);
> +
> + tmpdata = clk_get_rate(clk) / 1000;
> + writel(tmpdata, mmio + HOST_TIMER1MS);
> +
> + iounmap(mmio);
> +
> + return ret;
> +
> +no_clk:
> + clk = clk_get(dev, "usb_phy1");
While technically not strictly necessary at the moment you should
balance your clk_get / clk_put calls. Everything else is bad taste.
> + if (IS_ERR(clk)) {
> + clk = NULL;
> + printk(KERN_ERR "IMX AHCI can't get USB PHY1 CLK.\n");
> + } else {
> + clk_disable(clk);
> + clk_put(clk);
> + }
> +
> +no_input_clk:
> + clk = clk_get(dev, "imx_sata_clk");
> + if (IS_ERR(clk)) {
> + clk = NULL;
> + printk(KERN_ERR "IMX AHCI can't get clock.\n");
> + } else {
> + clk_disable(clk);
> + clk_put(clk);
> + }
> +
> + return ret;
> +}
> +
> +static void sata_exit(struct device *dev)
> +{
> + struct clk *clk;
> +
> + clk = clk_get(dev, "usb_phy1");
> + if (IS_ERR(clk)) {
> + clk = NULL;
> + printk(KERN_ERR "IMX AHCI can't get USB PHY1 CLK.\n");
> + } else {
> + clk_disable(clk);
> + clk_put(clk);
> + }
> +
> + clk = clk_get(dev, "imx_sata_clk");
> + if (IS_ERR(clk)) {
> + clk = NULL;
> + printk(KERN_ERR "IMX AHCI can't get clock.\n");
> + } else {
> + clk_disable(clk);
> + clk_put(clk);
> + }
> +}
> +
> +static struct ahci_platform_data sata_data = {
> + .init = sata_init,
> + .exit = sata_exit,
> +};
> +
> static void __init mx53_loco_board_init(void)
> {
> mxc_iomux_v3_setup_multiple_pads(mx53_loco_pads,
> @@ -215,6 +334,7 @@ static void __init mx53_loco_board_init(void)
> imx53_add_imx_i2c(1, &mx53_loco_i2c_data);
> imx53_add_sdhci_esdhc_imx(0, NULL);
> imx53_add_sdhci_esdhc_imx(2, NULL);
> + imx53_add_ahci_imx(0, &sata_data);
> }
>
> static void __init mx53_loco_timer_init(void)
> --
> 1.7.1
>
>
>
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