--- zzzz-none-000/linux-3.10.107/drivers/i2c/busses/i2c-ismt.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/drivers/i2c/busses/i2c-ismt.c 2021-02-04 17:41:59.000000000 +0000 @@ -14,10 +14,6 @@ * 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 St - Fifth Floor, Boston, MA 02110-1301 USA. * The full GNU General Public License is included in this distribution * in the file called LICENSE.GPL. * @@ -62,7 +58,6 @@ */ #include -#include #include #include #include @@ -72,7 +67,7 @@ #include #include -#include +#include /* PCI Address Constants */ #define SMBBAR 0 @@ -82,7 +77,7 @@ #define PCI_DEVICE_ID_INTEL_S1200_SMT1 0x0c5a #define PCI_DEVICE_ID_INTEL_AVOTON_SMT 0x1f15 -#define ISMT_DESC_ENTRIES 32 /* number of descriptor entries */ +#define ISMT_DESC_ENTRIES 2 /* number of descriptor entries */ #define ISMT_MAX_RETRIES 3 /* number of SMBus retries to attempt */ /* Hardware Descriptor Constants - Control Field */ @@ -170,20 +165,19 @@ struct ismt_priv { struct i2c_adapter adapter; - void *smba; /* PCI BAR */ + void __iomem *smba; /* PCI BAR */ struct pci_dev *pci_dev; struct ismt_desc *hw; /* descriptor virt base addr */ dma_addr_t io_rng_dma; /* descriptor HW base addr */ u8 head; /* ring buffer head pointer */ struct completion cmp; /* interrupt completion */ u8 dma_buffer[I2C_SMBUS_BLOCK_MAX + 1]; /* temp R/W data buffer */ - bool using_msi; /* type of interrupt flag */ }; /** * ismt_ids - PCI device IDs supported by this driver */ -static DEFINE_PCI_DEVICE_TABLE(ismt_ids) = { +static const struct pci_device_id ismt_ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_S1200_SMT0) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_S1200_SMT1) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_AVOTON_SMT) }, @@ -344,6 +338,7 @@ data->word = dma_buffer[0] | (dma_buffer[1] << 8); break; case I2C_SMBUS_BLOCK_DATA: + case I2C_SMBUS_I2C_BLOCK_DATA: memcpy(&data->block[1], dma_buffer, desc->rxbytes); data->block[0] = desc->rxbytes; break; @@ -384,6 +379,7 @@ int size, union i2c_smbus_data *data) { int ret; + unsigned long time_left; dma_addr_t dma_addr = 0; /* address of the data buffer */ u8 dma_size = 0; enum dma_data_direction dma_direction = 0; @@ -401,7 +397,7 @@ desc->tgtaddr_rw = ISMT_DESC_ADDR_RW(addr, read_write); /* Initialize common control bits */ - if (likely(priv->using_msi)) + if (likely(pci_dev_msi_enabled(priv->pci_dev))) desc->control = ISMT_DESC_INT | ISMT_DESC_FAIR; else desc->control = ISMT_DESC_FAIR; @@ -497,7 +493,7 @@ desc->wr_len_cmd = dma_size; desc->control |= ISMT_DESC_BLK; priv->dma_buffer[0] = command; - memcpy(&priv->dma_buffer[1], &data->block[1], dma_size); + memcpy(&priv->dma_buffer[1], &data->block[1], dma_size - 1); } else { /* Block Read */ dev_dbg(dev, "I2C_SMBUS_BLOCK_DATA: READ\n"); @@ -509,6 +505,41 @@ } break; + case I2C_SMBUS_I2C_BLOCK_DATA: + /* Make sure the length is valid */ + if (data->block[0] < 1) + data->block[0] = 1; + + if (data->block[0] > I2C_SMBUS_BLOCK_MAX) + data->block[0] = I2C_SMBUS_BLOCK_MAX; + + if (read_write == I2C_SMBUS_WRITE) { + /* i2c Block Write */ + dev_dbg(dev, "I2C_SMBUS_I2C_BLOCK_DATA: WRITE\n"); + dma_size = data->block[0] + 1; + dma_direction = DMA_TO_DEVICE; + desc->wr_len_cmd = dma_size; + desc->control |= ISMT_DESC_I2C; + priv->dma_buffer[0] = command; + memcpy(&priv->dma_buffer[1], &data->block[1], dma_size - 1); + } else { + /* i2c Block Read */ + dev_dbg(dev, "I2C_SMBUS_I2C_BLOCK_DATA: READ\n"); + dma_size = data->block[0]; + dma_direction = DMA_FROM_DEVICE; + desc->rd_len = dma_size; + desc->wr_len_cmd = command; + desc->control |= (ISMT_DESC_I2C | ISMT_DESC_CWRL); + /* + * Per the "Table 15-15. I2C Commands", + * in the External Design Specification (EDS), + * (Document Number: 508084, Revision: 2.0), + * the _rw bit must be 0 + */ + desc->tgtaddr_rw = ISMT_DESC_ADDR_RW(addr, 0); + } + break; + default: dev_err(dev, "Unsupported transaction %d\n", size); @@ -541,19 +572,19 @@ desc->dptr_high = upper_32_bits(dma_addr); } - INIT_COMPLETION(priv->cmp); + reinit_completion(&priv->cmp); /* Add the descriptor */ ismt_submit_desc(priv); /* Now we wait for interrupt completion, 1s */ - ret = wait_for_completion_timeout(&priv->cmp, HZ*1); + time_left = wait_for_completion_timeout(&priv->cmp, HZ*1); /* unmap the data buffer */ if (dma_size != 0) dma_unmap_single(&adap->dev, dma_addr, dma_size, dma_direction); - if (unlikely(!ret)) { + if (unlikely(!time_left)) { dev_err(dev, "completion wait timed out\n"); ret = -ETIMEDOUT; goto out; @@ -582,6 +613,7 @@ I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_DATA | + I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_PEC; } @@ -756,11 +788,8 @@ /* Try using MSI interrupts */ err = pci_enable_msi(priv->pci_dev); - if (err) { - dev_warn(&priv->pci_dev->dev, - "Unable to use MSI interrupts, falling back to legacy\n"); + if (err) goto intx; - } err = devm_request_irq(&priv->pci_dev->dev, priv->pci_dev->irq, @@ -773,11 +802,13 @@ goto intx; } - priv->using_msi = true; - goto done; + return 0; /* Try using legacy interrupts */ intx: + dev_warn(&priv->pci_dev->dev, + "Unable to use MSI interrupts, falling back to legacy\n"); + err = devm_request_irq(&priv->pci_dev->dev, priv->pci_dev->irq, ismt_do_interrupt, @@ -786,12 +817,9 @@ priv); if (err) { dev_err(&priv->pci_dev->dev, "no usable interrupts\n"); - return -ENODEV; + return err; } - priv->using_msi = false; - -done: return 0; } @@ -814,17 +842,13 @@ return -ENOMEM; pci_set_drvdata(pdev, priv); + i2c_set_adapdata(&priv->adapter, priv); priv->adapter.owner = THIS_MODULE; - priv->adapter.class = I2C_CLASS_HWMON; - priv->adapter.algo = &smbus_algorithm; - - /* set up the sysfs linkage to our parent device */ priv->adapter.dev.parent = &pdev->dev; - - /* number of retries on lost arbitration */ + ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&pdev->dev)); priv->adapter.retries = ISMT_MAX_RETRIES; priv->pci_dev = pdev; @@ -871,8 +895,7 @@ priv->smba = pcim_iomap(pdev, SMBBAR, len); if (!priv->smba) { dev_err(&pdev->dev, "Unable to ioremap SMBus BAR\n"); - err = -ENODEV; - goto fail; + return -ENODEV; } if ((pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) != 0) || @@ -882,31 +905,26 @@ DMA_BIT_MASK(32)) != 0)) { dev_err(&pdev->dev, "pci_set_dma_mask fail %p\n", pdev); - goto fail; + return -ENODEV; } } err = ismt_dev_init(priv); if (err) - goto fail; + return err; ismt_hw_init(priv); err = ismt_int_init(priv); if (err) - goto fail; + return err; err = i2c_add_adapter(&priv->adapter); if (err) { dev_err(&pdev->dev, "Failed to add SMBus iSMT adapter\n"); - err = -ENODEV; - goto fail; + return -ENODEV; } return 0; - -fail: - pci_release_region(pdev, SMBBAR); - return err; } /** @@ -918,47 +936,13 @@ struct ismt_priv *priv = pci_get_drvdata(pdev); i2c_del_adapter(&priv->adapter); - pci_release_region(pdev, SMBBAR); } -/** - * ismt_suspend() - place the device in suspend - * @pdev: PCI-Express device - * @mesg: PM message - */ -#ifdef CONFIG_PM -static int ismt_suspend(struct pci_dev *pdev, pm_message_t mesg) -{ - pci_save_state(pdev); - pci_set_power_state(pdev, pci_choose_state(pdev, mesg)); - return 0; -} - -/** - * ismt_resume() - PCI resume code - * @pdev: PCI-Express device - */ -static int ismt_resume(struct pci_dev *pdev) -{ - pci_set_power_state(pdev, PCI_D0); - pci_restore_state(pdev); - return pci_enable_device(pdev); -} - -#else - -#define ismt_suspend NULL -#define ismt_resume NULL - -#endif - static struct pci_driver ismt_driver = { .name = "ismt_smbus", .id_table = ismt_ids, .probe = ismt_probe, .remove = ismt_remove, - .suspend = ismt_suspend, - .resume = ismt_resume, }; module_pci_driver(ismt_driver);