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 | 156 |
1 files changed, 156 insertions, 0 deletions
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 00000000..ade4a1c4 --- /dev/null +++ b/arch/arm/plat-mxc/devices/platform-ahci-imx.c @@ -0,0 +1,156 @@ +/* + * 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 <linux/dma-mapping.h> +#include <asm/sizes.h> +#include <mach/hardware.h> +#include <mach/devices-common.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 + +enum { + HOST_CAP = 0x00, + HOST_CAP_SSS = (1 << 27), /* Staggered Spin-up */ + HOST_PORTS_IMPL = 0x0c, + HOST_TIMER1MS = 0xe0, /* Timer 1-ms */ +}; + +static struct clk *sata_clk, *sata_ref_clk; + +/* AHCI module Initialization, if return 0, initialization is successful. */ +static int imx_sata_init(struct device *dev, void __iomem *addr) +{ + 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_prepare_enable(sata_clk); + if (ret) { + dev_err(dev, "can't prepare/enable sata clock.\n"); + goto put_sata_clk; + } + + /* Get the AHCI SATA PHY CLK */ + 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_prepare_enable(sata_ref_clk); + if (ret) { + dev_err(dev, "can't prepare/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_unprepare(sata_ref_clk); +put_sata_ref_clk: + clk_put(sata_ref_clk); +release_sata_clk: + clk_disable_unprepare(sata_clk); +put_sata_clk: + clk_put(sata_clk); + + return ret; +} + +static void imx_sata_exit(struct device *dev) +{ + clk_disable_unprepare(sata_ref_clk); + clk_put(sata_ref_clk); + + clk_disable_unprepare(sata_clk); + clk_put(sata_clk); + +} +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, + }, + }; + + return imx_add_platform_device_dmamask(data->devid, 0, + res, ARRAY_SIZE(res), + pdata, sizeof(*pdata), DMA_BIT_MASK(32)); +} + +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); +} |