--- zzzz-none-000/linux-3.10.107/drivers/i2c/busses/i2c-designware-platdrv.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/drivers/i2c/busses/i2c-designware-platdrv.c 2021-02-04 17:41:59.000000000 +0000 @@ -18,58 +18,113 @@ * 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., 675 Mass Ave, Cambridge, MA 02139, USA. * ---------------------------------------------------------------------------- * */ #include #include #include +#include #include #include +#include #include #include #include #include -#include +#include #include #include #include #include #include #include +#include #include "i2c-designware-core.h" -static struct i2c_algorithm i2c_dw_algo = { - .master_xfer = i2c_dw_xfer, - .functionality = i2c_dw_func, -}; +#include +#include + static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) { return clk_get_rate(dev->clk)/1000; } #ifdef CONFIG_ACPI +/* + * The HCNT/LCNT information coming from ACPI should be the most accurate + * for given platform. However, some systems get it wrong. On such systems + * we get better results by calculating those based on the input clock. + */ +static const struct dmi_system_id dw_i2c_no_acpi_params[] = { + { + .ident = "Dell Inspiron 7348", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7348"), + }, + }, + { } +}; + +static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], + u16 *hcnt, u16 *lcnt, u32 *sda_hold) +{ + struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; + acpi_handle handle = ACPI_HANDLE(&pdev->dev); + union acpi_object *obj; + + if (dmi_check_system(dw_i2c_no_acpi_params)) + return; + + if (ACPI_FAILURE(acpi_evaluate_object(handle, method, NULL, &buf))) + return; + + obj = (union acpi_object *)buf.pointer; + if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) { + const union acpi_object *objs = obj->package.elements; + + *hcnt = (u16)objs[0].integer.value; + *lcnt = (u16)objs[1].integer.value; + if (sda_hold) + *sda_hold = (u32)objs[2].integer.value; + } + + kfree(buf.pointer); +} + static int dw_i2c_acpi_configure(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); - - if (!ACPI_HANDLE(&pdev->dev)) - return -ENODEV; + const struct acpi_device_id *id; dev->adapter.nr = -1; dev->tx_fifo_depth = 32; dev->rx_fifo_depth = 32; + + /* + * Try to get SDA hold time and *CNT values from an ACPI method if + * it exists for both supported speed modes. + */ + dw_i2c_acpi_params(pdev, "SSCN", &dev->ss_hcnt, &dev->ss_lcnt, NULL); + dw_i2c_acpi_params(pdev, "FMCN", &dev->fs_hcnt, &dev->fs_lcnt, + &dev->sda_hold_time); + + id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); + if (id && id->driver_data) + dev->accessor_flags |= (u32)id->driver_data; + return 0; } static const struct acpi_device_id dw_i2c_acpi_match[] = { { "INT33C2", 0 }, { "INT33C3", 0 }, + { "INT3432", 0 }, + { "INT3433", 0 }, { "80860F41", 0 }, + { "808622C1", 0 }, + { "AMD0010", ACCESS_INTR_MASK }, { } }; MODULE_DEVICE_TABLE(acpi, dw_i2c_acpi_match); @@ -80,46 +135,74 @@ } #endif -static int dw_i2c_probe(struct platform_device *pdev) +static int dw_i2c_plat_probe(struct platform_device *pdev) { struct dw_i2c_dev *dev; struct i2c_adapter *adap; struct resource *mem; + struct dw_i2c_platform_data *pdata; int irq, r; - - /* NOTE: driver uses the static register mapping */ - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!mem) { - dev_err(&pdev->dev, "no mem resource?\n"); - return -EINVAL; - } + u32 clk_freq, ht = 0; irq = platform_get_irq(pdev, 0); - if (irq < 0) { - dev_err(&pdev->dev, "no irq resource?\n"); - return irq; /* -ENXIO */ - } + if (irq < 0) + return irq; dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL); if (!dev) return -ENOMEM; + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); dev->base = devm_ioremap_resource(&pdev->dev, mem); if (IS_ERR(dev->base)) return PTR_ERR(dev->base); - init_completion(&dev->cmd_complete); - mutex_init(&dev->lock); dev->dev = &pdev->dev; dev->irq = irq; + dev->is_old_version = 0; platform_set_drvdata(pdev, dev); - dev->clk = devm_clk_get(&pdev->dev, NULL); - dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; + /* fast mode by default because of legacy reasons */ + clk_freq = 400000; - if (IS_ERR(dev->clk)) - return PTR_ERR(dev->clk); - clk_prepare_enable(dev->clk); + if (has_acpi_companion(&pdev->dev)) { + dw_i2c_acpi_configure(pdev); + } else if (pdev->dev.of_node) { + of_property_read_u32(pdev->dev.of_node, + "i2c-sda-hold-time-ns", &ht); + + of_property_read_u32(pdev->dev.of_node, + "i2c-sda-falling-time-ns", + &dev->sda_falling_time); + of_property_read_u32(pdev->dev.of_node, + "i2c-scl-falling-time-ns", + &dev->scl_falling_time); + + of_property_read_u32(pdev->dev.of_node, "clock-frequency", + &clk_freq); + + of_property_read_u32(pdev->dev.of_node, "is_old_version", + &dev->is_old_version); + of_property_read_u32(pdev->dev.of_node, "i2c-tx-fifo-depth", + &dev->tx_fifo_depth); + of_property_read_u32(pdev->dev.of_node, "i2c-rx-fifo-depth", + &dev->rx_fifo_depth); + /* Only standard mode at 100kHz and fast mode at 400kHz + * are supported. + */ + if (clk_freq != 100000 && clk_freq != 400000) { + dev_err(&pdev->dev, "Only 100kHz and 400kHz supported"); + return -EINVAL; + } + } else { + pdata = dev_get_platdata(&pdev->dev); + if (pdata) + clk_freq = pdata->i2c_scl_freq; + } + + r = i2c_dw_eval_lock_support(dev); + if (r) + return r; dev->functionality = I2C_FUNC_I2C | @@ -128,57 +211,57 @@ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_I2C_BLOCK; - dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | - DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; + if (clk_freq == 100000) + dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | + DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_STD; + else + dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | + DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST; - /* Try first if we can configure the device from ACPI */ - r = dw_i2c_acpi_configure(pdev); - if (r) { + dev->clk = devm_clk_get(&pdev->dev, NULL); + dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; + if (IS_ERR(dev->clk)) + return PTR_ERR(dev->clk); + clk_prepare_enable(dev->clk); + + if (!dev->sda_hold_time && ht) { + u32 ic_clk = dev->get_clk_rate_khz(dev); + + dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000, + 1000000); + } + + if (!dev->tx_fifo_depth && !dev->is_old_version) { u32 param1 = i2c_dw_read_comp_param(dev); dev->tx_fifo_depth = ((param1 >> 16) & 0xff) + 1; dev->rx_fifo_depth = ((param1 >> 8) & 0xff) + 1; dev->adapter.nr = pdev->id; } - r = i2c_dw_init(dev); - if (r) - return r; - - i2c_dw_disable_int(dev); - r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED, - pdev->name, dev); - if (r) { - dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); - return r; - } adap = &dev->adapter; - i2c_set_adapdata(adap, dev); adap->owner = THIS_MODULE; - adap->class = I2C_CLASS_HWMON; - strlcpy(adap->name, "Synopsys DesignWare I2C adapter", - sizeof(adap->name)); - adap->algo = &i2c_dw_algo; - adap->dev.parent = &pdev->dev; + adap->class = I2C_CLASS_DEPRECATED; + ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); adap->dev.of_node = pdev->dev.of_node; - r = i2c_add_numbered_adapter(adap); - if (r) { - dev_err(&pdev->dev, "failure adding adapter\n"); - return r; + if (dev->pm_runtime_disabled) { + pm_runtime_forbid(&pdev->dev); + } else { + pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); } - of_i2c_register_devices(adap); - acpi_i2c_register_devices(adap); - pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); - pm_runtime_use_autosuspend(&pdev->dev); - pm_runtime_set_active(&pdev->dev); - pm_runtime_enable(&pdev->dev); + r = i2c_dw_probe(dev); + if (r && !dev->pm_runtime_disabled) + pm_runtime_disable(&pdev->dev); - return 0; + return r; } -static int dw_i2c_remove(struct platform_device *pdev) +static int dw_i2c_plat_remove(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); @@ -188,8 +271,10 @@ i2c_dw_disable(dev); - pm_runtime_put(&pdev->dev); - pm_runtime_disable(&pdev->dev); + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); + if (!dev->pm_runtime_disabled) + pm_runtime_disable(&pdev->dev); return 0; } @@ -202,48 +287,76 @@ MODULE_DEVICE_TABLE(of, dw_i2c_of_match); #endif +#ifdef CONFIG_PM_SLEEP +static int dw_i2c_plat_prepare(struct device *dev) +{ + return pm_runtime_suspended(dev); +} + +static void dw_i2c_plat_complete(struct device *dev) +{ + if (dev->power.direct_complete) + pm_request_resume(dev); +} +#else +#define dw_i2c_plat_prepare NULL +#define dw_i2c_plat_complete NULL +#endif + #ifdef CONFIG_PM -static int dw_i2c_suspend(struct device *dev) +static int dw_i2c_plat_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); + i2c_dw_disable(i_dev); clk_disable_unprepare(i_dev->clk); return 0; } -static int dw_i2c_resume(struct device *dev) +static int dw_i2c_plat_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); clk_prepare_enable(i_dev->clk); - i2c_dw_init(i_dev); + + if (!i_dev->pm_runtime_disabled) + i2c_dw_init(i_dev); return 0; } -#endif -static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); +static const struct dev_pm_ops dw_i2c_dev_pm_ops = { + .prepare = dw_i2c_plat_prepare, + .complete = dw_i2c_plat_complete, + SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume) + SET_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL) +}; + +#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops) +#else +#define DW_I2C_DEV_PMOPS NULL +#endif /* work with hotplug and coldplug */ MODULE_ALIAS("platform:i2c_designware"); static struct platform_driver dw_i2c_driver = { - .remove = dw_i2c_remove, + .probe = dw_i2c_plat_probe, + .remove = dw_i2c_plat_remove, .driver = { .name = "i2c_designware", - .owner = THIS_MODULE, .of_match_table = of_match_ptr(dw_i2c_of_match), .acpi_match_table = ACPI_PTR(dw_i2c_acpi_match), - .pm = &dw_i2c_dev_pm_ops, + .pm = DW_I2C_DEV_PMOPS, }, }; static int __init dw_i2c_init_driver(void) { - return platform_driver_probe(&dw_i2c_driver, dw_i2c_probe); + return platform_driver_register(&dw_i2c_driver); } subsys_initcall(dw_i2c_init_driver);