diff options
Diffstat (limited to 'arch/arm/plat-mxc/devices/platform-ahci-imx.c')
| -rw-r--r-- | arch/arm/plat-mxc/devices/platform-ahci-imx.c | 40 |
1 files changed, 32 insertions, 8 deletions
diff --git a/arch/arm/plat-mxc/devices/platform-ahci-imx.c b/arch/arm/plat-mxc/devices/platform-ahci-imx.c index d8a56aee521..c9267e1be00 100644 --- a/arch/arm/plat-mxc/devices/platform-ahci-imx.c +++ b/arch/arm/plat-mxc/devices/platform-ahci-imx.c @@ -21,6 +21,7 @@ #include <linux/io.h> #include <linux/clk.h> #include <linux/err.h> +#include <linux/delay.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <asm/sizes.h> @@ -42,8 +43,12 @@ const struct imx_ahci_imx_data imx53_ahci_imx_data __initconst = enum { HOST_CAP = 0x00, HOST_CAP_SSS = (1 << 27), /* Staggered Spin-up */ - HOST_PORTS_IMPL = 0x0c, - HOST_TIMER1MS = 0xe0, /* Timer 1-ms */ + HOST_PORTS_IMPL = 0x0C, + HOST_TIMER1MS = 0xE0, /* Timer 1-ms */ + + PORT_SATA_SR = 0x128, /* Port0 PHY Control */ + PORT_PHY_CTL = 0x178, /* Port0 PHY Control */ + PORT_PHY_CTL_PDDQ_LOC = 0x100000, }; static struct clk *sata_clk, *sata_ref_clk; @@ -52,7 +57,7 @@ static struct clk *sata_clk, *sata_ref_clk; static int imx_sata_init(struct device *dev, void __iomem *addr) { u32 tmpdata; - int ret = 0; + int ret = 0, iterations = 200; struct clk *clk; sata_clk = clk_get(dev, "ahci"); @@ -100,6 +105,23 @@ static int imx_sata_init(struct device *dev, void __iomem *addr) if (!(readl(addr + HOST_PORTS_IMPL) & 0x1)) writel((readl(addr + HOST_PORTS_IMPL) | 0x1), addr + HOST_PORTS_IMPL); + /* Release resources when there is no device on the port */ + do { + if ((readl(addr + PORT_SATA_SR) & 0xF) == 0) + usleep_range(2000, 3000); + else + break; + + if (iterations == 0) { + /* Enter into PDDQ mode, save power */ + pr_info("No sata disk, enter into PDDQ mode.\n"); + tmpdata = readl(addr + PORT_PHY_CTL); + writel(tmpdata | PORT_PHY_CTL_PDDQ_LOC, + addr + PORT_PHY_CTL); + ret = -ENODEV; + goto release_sata_ref_clk; + } + } while (iterations-- > 0); return 0; @@ -145,12 +167,14 @@ struct platform_device *__init imx_add_ahci_imx( pdata, sizeof(*pdata), DMA_BIT_MASK(32)); } +struct ahci_platform_data imx_sata_pdata = { + .init = imx_sata_init, + .exit = imx_sata_exit, +}; + +#ifdef CONFIG_SOC_IMX53 struct platform_device *__init imx53_add_ahci_imx(void) { - struct ahci_platform_data pdata = { - .init = imx_sata_init, - .exit = imx_sata_exit, - }; - return imx_add_ahci_imx(&imx53_ahci_imx_data, &pdata); } +#endif |