target/linux/imx6/patches-3.10/0005-ahci_imx-add-ahci-sata-support-on-imx-platforms.patch

   1 From: Richard Zhu <r65037@freescale.com>
   2 Subject: [PATCH] ahci_imx: add ahci sata support on imx platforms
   3
   4 imx6q contains one Synopsys AHCI SATA controller, But it can't share
   5 ahci_platform driver with other controllers because there are some
   6 misalignments of the generic AHCI controller - the bits definitions of
   7 the HBA registers, the Vendor Specific registers, the AHCI PHY clock
   8 and the AHCI signals adjustment window(GPR13 register).
   9
  10  - CAP_SSS(bit20) of the HOST_CAP is writable, default value is '0',
  11    should be configured to be '1'
  12
  13  - bit0 (only one AHCI SATA port on imx6q) of the HOST_PORTS_IMPL
  14    should be set to be '1'.(default 0)
  15
  16  - One Vendor Specific register HOST_TIMER1MS(offset:0xe0) should be
  17    configured regarding to the frequency of AHB bus clock.
  18
  19  - Configurations of the AHCI PHY clock, and the signal parameters of
  20    the GPR13
  21
  22 Setup its own ahci sata driver, contained the imx6q specific
  23 initialized codes, re-use the generic ahci_platform driver, and keep
  24 the generic ahci_platform driver clean as much as possible.
  25
  26 tj: patch description reformatted
  27
  28 Signed-off-by: Richard Zhu <r65037@freescale.com>
  29 Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
  30 Signed-off-by: Tejun Heo <tj@kernel.org>
  31 ---
  32  drivers/ata/Kconfig    |   9 ++
  33  drivers/ata/Makefile   |   1 +
  34  drivers/ata/ahci_imx.c | 236 +++++++++++++++++++++++++++++++++++++++++++++++++
  35  3 files changed, 246 insertions(+)
  36  create mode 100644 drivers/ata/ahci_imx.c
  37
  38 --- a/drivers/ata/Kconfig
  39 +++ b/drivers/ata/Kconfig
  40 @@ -97,6 +97,15 @@ config SATA_AHCI_PLATFORM
  41
  42           If unsure, say N.
  43
  44 +config AHCI_IMX
  45 +       tristate "Freescale i.MX AHCI SATA support"
  46 +       depends on SATA_AHCI_PLATFORM
  47 +       help
  48 +         This option enables support for the Freescale i.MX SoC's
  49 +         onboard AHCI SATA.
  50 +
  51 +         If unsure, say N.
  52 +
  53  config SATA_FSL
  54         tristate "Freescale 3.0Gbps SATA support"
  55         depends on FSL_SOC
  56 --- a/drivers/ata/Makefile
  57 +++ b/drivers/ata/Makefile
  58 @@ -10,6 +10,7 @@ obj-$(CONFIG_SATA_INIC162X)   += sata_inic
  59  obj-$(CONFIG_SATA_SIL24)       += sata_sil24.o
  60  obj-$(CONFIG_SATA_DWC)         += sata_dwc_460ex.o
  61  obj-$(CONFIG_SATA_HIGHBANK)    += sata_highbank.o libahci.o
  62 +obj-$(CONFIG_AHCI_IMX)         += ahci_imx.o
  63
  64  # SFF w/ custom DMA
  65  obj-$(CONFIG_PDC_ADMA)         += pdc_adma.o
  66 --- /dev/null
  67 +++ b/drivers/ata/ahci_imx.c
  68 @@ -0,0 +1,236 @@
  69 +/*
  70 + * Freescale IMX AHCI SATA platform driver
  71 + * Copyright 2013 Freescale Semiconductor, Inc.
  72 + *
  73 + * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
  74 + *
  75 + * This program is free software; you can redistribute it and/or modify it
  76 + * under the terms and conditions of the GNU General Public License,
  77 + * version 2, as published by the Free Software Foundation.
  78 + *
  79 + * This program is distributed in the hope it will be useful, but WITHOUT
  80 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  81 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  82 + * more details.
  83 + *
  84 + * You should have received a copy of the GNU General Public License along with
  85 + * this program. If not, see <http://www.gnu.org/licenses/>.
  86 + */
  87 +
  88 +#include <linux/kernel.h>
  89 +#include <linux/module.h>
  90 +#include <linux/platform_device.h>
  91 +#include <linux/regmap.h>
  92 +#include <linux/ahci_platform.h>
  93 +#include <linux/of_device.h>
  94 +#include <linux/mfd/syscon.h>
  95 +#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  96 +#include "ahci.h"
  97 +
  98 +enum {
  99 +       HOST_TIMER1MS = 0xe0, /* Timer 1-ms */
 100 +};
 101 +
 102 +struct imx_ahci_priv {
 103 +       struct platform_device *ahci_pdev;
 104 +       struct clk *sata_ref_clk;
 105 +       struct clk *ahb_clk;
 106 +       struct regmap *gpr;
 107 +};
 108 +
 109 +static int imx6q_sata_init(struct device *dev, void __iomem *mmio)
 110 +{
 111 +       int ret = 0;
 112 +       unsigned int reg_val;
 113 +       struct imx_ahci_priv *imxpriv = dev_get_drvdata(dev->parent);
 114 +
 115 +       imxpriv->gpr =
 116 +               syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
 117 +       if (IS_ERR(imxpriv->gpr)) {
 118 +               dev_err(dev, "failed to find fsl,imx6q-iomux-gpr regmap\n");
 119 +               return PTR_ERR(imxpriv->gpr);
 120 +       }
 121 +
 122 +       ret = clk_prepare_enable(imxpriv->sata_ref_clk);
 123 +       if (ret < 0) {
 124 +               dev_err(dev, "prepare-enable sata_ref clock err:%d\n", ret);
 125 +               return ret;
 126 +       }
 127 +
 128 +       /*
 129 +        * set PHY Paremeters, two steps to configure the GPR13,
 130 +        * one write for rest of parameters, mask of first write
 131 +        * is 0x07fffffd, and the other one write for setting
 132 +        * the mpll_clk_en.
 133 +        */
 134 +       regmap_update_bits(imxpriv->gpr, 0x34, IMX6Q_GPR13_SATA_RX_EQ_VAL_MASK
 135 +                       | IMX6Q_GPR13_SATA_RX_LOS_LVL_MASK
 136 +                       | IMX6Q_GPR13_SATA_RX_DPLL_MODE_MASK
 137 +                       | IMX6Q_GPR13_SATA_SPD_MODE_MASK
 138 +                       | IMX6Q_GPR13_SATA_MPLL_SS_EN
 139 +                       | IMX6Q_GPR13_SATA_TX_ATTEN_MASK
 140 +                       | IMX6Q_GPR13_SATA_TX_BOOST_MASK
 141 +                       | IMX6Q_GPR13_SATA_TX_LVL_MASK
 142 +                       | IMX6Q_GPR13_SATA_TX_EDGE_RATE
 143 +                       , IMX6Q_GPR13_SATA_RX_EQ_VAL_3_0_DB
 144 +                       | IMX6Q_GPR13_SATA_RX_LOS_LVL_SATA2M
 145 +                       | IMX6Q_GPR13_SATA_RX_DPLL_MODE_2P_4F
 146 +                       | IMX6Q_GPR13_SATA_SPD_MODE_3P0G
 147 +                       | IMX6Q_GPR13_SATA_MPLL_SS_EN
 148 +                       | IMX6Q_GPR13_SATA_TX_ATTEN_9_16
 149 +                       | IMX6Q_GPR13_SATA_TX_BOOST_3_33_DB
 150 +                       | IMX6Q_GPR13_SATA_TX_LVL_1_025_V);
 151 +       regmap_update_bits(imxpriv->gpr, 0x34, IMX6Q_GPR13_SATA_MPLL_CLK_EN,
 152 +                       IMX6Q_GPR13_SATA_MPLL_CLK_EN);
 153 +       usleep_range(100, 200);
 154 +
 155 +       /*
 156 +        * Configure the HWINIT bits of the HOST_CAP and HOST_PORTS_IMPL,
 157 +        * and IP vendor specific register HOST_TIMER1MS.
 158 +        * Configure CAP_SSS (support stagered spin up).
 159 +        * Implement the port0.
 160 +        * Get the ahb clock rate, and configure the TIMER1MS register.
 161 +        */
 162 +       reg_val = readl(mmio + HOST_CAP);
 163 +       if (!(reg_val & HOST_CAP_SSS)) {
 164 +               reg_val |= HOST_CAP_SSS;
 165 +               writel(reg_val, mmio + HOST_CAP);
 166 +       }
 167 +       reg_val = readl(mmio + HOST_PORTS_IMPL);
 168 +       if (!(reg_val & 0x1)) {
 169 +               reg_val |= 0x1;
 170 +               writel(reg_val, mmio + HOST_PORTS_IMPL);
 171 +       }
 172 +
 173 +       reg_val = clk_get_rate(imxpriv->ahb_clk) / 1000;
 174 +       writel(reg_val, mmio + HOST_TIMER1MS);
 175 +
 176 +       return 0;
 177 +}
 178 +
 179 +static void imx6q_sata_exit(struct device *dev)
 180 +{
 181 +       struct imx_ahci_priv *imxpriv =  dev_get_drvdata(dev->parent);
 182 +
 183 +       regmap_update_bits(imxpriv->gpr, 0x34, IMX6Q_GPR13_SATA_MPLL_CLK_EN,
 184 +                       !IMX6Q_GPR13_SATA_MPLL_CLK_EN);
 185 +       clk_disable_unprepare(imxpriv->sata_ref_clk);
 186 +}
 187 +
 188 +static struct ahci_platform_data imx6q_sata_pdata = {
 189 +       .init = imx6q_sata_init,
 190 +       .exit = imx6q_sata_exit,
 191 +};
 192 +
 193 +static const struct of_device_id imx_ahci_of_match[] = {
 194 +       { .compatible = "fsl,imx6q-ahci", .data = &imx6q_sata_pdata},
 195 +       {},
 196 +};
 197 +MODULE_DEVICE_TABLE(of, imx_ahci_of_match);
 198 +
 199 +static int imx_ahci_probe(struct platform_device *pdev)
 200 +{
 201 +       struct device *dev = &pdev->dev;
 202 +       struct resource *mem, *irq, res[2];
 203 +       const struct of_device_id *of_id;
 204 +       const struct ahci_platform_data *pdata = NULL;
 205 +       struct imx_ahci_priv *imxpriv;
 206 +       struct device *ahci_dev;
 207 +       struct platform_device *ahci_pdev;
 208 +       int ret;
 209 +
 210 +       imxpriv = devm_kzalloc(dev, sizeof(*imxpriv), GFP_KERNEL);
 211 +       if (!imxpriv) {
 212 +               dev_err(dev, "can't alloc ahci_host_priv\n");
 213 +               return -ENOMEM;
 214 +       }
 215 +
 216 +       ahci_pdev = platform_device_alloc("ahci", -1);
 217 +       if (!ahci_pdev)
 218 +               return -ENODEV;
 219 +
 220 +       ahci_dev = &ahci_pdev->dev;
 221 +       ahci_dev->parent = dev;
 222 +
 223 +       imxpriv->ahb_clk = devm_clk_get(dev, "ahb");
 224 +       if (IS_ERR(imxpriv->ahb_clk)) {
 225 +               dev_err(dev, "can't get ahb clock.\n");
 226 +               ret = PTR_ERR(imxpriv->ahb_clk);
 227 +               goto err_out;
 228 +       }
 229 +
 230 +       imxpriv->sata_ref_clk = devm_clk_get(dev, "sata_ref");
 231 +       if (IS_ERR(imxpriv->sata_ref_clk)) {
 232 +               dev_err(dev, "can't get sata_ref clock.\n");
 233 +               ret = PTR_ERR(imxpriv->sata_ref_clk);
 234 +               goto err_out;
 235 +       }
 236 +
 237 +       imxpriv->ahci_pdev = ahci_pdev;
 238 +       platform_set_drvdata(pdev, imxpriv);
 239 +
 240 +       of_id = of_match_device(imx_ahci_of_match, dev);
 241 +       if (of_id) {
 242 +               pdata = of_id->data;
 243 +       } else {
 244 +               ret = -EINVAL;
 245 +               goto err_out;
 246 +       }
 247 +
 248 +       mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 249 +       irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 250 +       if (!mem || !irq) {
 251 +               dev_err(dev, "no mmio/irq resource\n");
 252 +               ret = -ENOMEM;
 253 +               goto err_out;
 254 +       }
 255 +
 256 +       res[0] = *mem;
 257 +       res[1] = *irq;
 258 +
 259 +       ahci_dev->coherent_dma_mask = DMA_BIT_MASK(32);
 260 +       ahci_dev->dma_mask = &ahci_dev->coherent_dma_mask;
 261 +       ahci_dev->of_node = dev->of_node;
 262 +
 263 +       ret = platform_device_add_resources(ahci_pdev, res, 2);
 264 +       if (ret)
 265 +               goto err_out;
 266 +
 267 +       ret = platform_device_add_data(ahci_pdev, pdata, sizeof(*pdata));
 268 +       if (ret)
 269 +               goto err_out;
 270 +
 271 +       ret = platform_device_add(ahci_pdev);
 272 +       if (ret) {
 273 +err_out:
 274 +               platform_device_put(ahci_pdev);
 275 +               return ret;
 276 +       }
 277 +
 278 +       return 0;
 279 +}
 280 +
 281 +static int imx_ahci_remove(struct platform_device *pdev)
 282 +{
 283 +       struct imx_ahci_priv *imxpriv = platform_get_drvdata(pdev);
 284 +       struct platform_device *ahci_pdev = imxpriv->ahci_pdev;
 285 +
 286 +       platform_device_unregister(ahci_pdev);
 287 +       return 0;
 288 +}
 289 +
 290 +static struct platform_driver imx_ahci_driver = {
 291 +       .probe = imx_ahci_probe,
 292 +       .remove = imx_ahci_remove,
 293 +       .driver = {
 294 +               .name = "ahci-imx",
 295 +               .owner = THIS_MODULE,
 296 +               .of_match_table = imx_ahci_of_match,
 297 +       },
 298 +};
 299 +module_platform_driver(imx_ahci_driver);
 300 +
 301 +MODULE_DESCRIPTION("Freescale i.MX AHCI SATA platform driver");
 302 +MODULE_AUTHOR("Richard Zhu <Hong-Xing.Zhu@freescale.com>");
 303 +MODULE_LICENSE("GPL");
 304 +MODULE_ALIAS("ahci:imx");