i2c: designware-pci: Introduce Merrifield support

This patch enables I2C controllers found on Intel Edison board.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index 586c8d8..a7aab10 100644 (file)
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -42,6 +42,7 @@
 
 enum dw_pci_ctl_id_t {
        medfield,
+       merrifield,
        baytrail,
        haswell,
 };
@@ -75,6 +76,14 @@ struct dw_pci_controller {
                                        I2C_FUNC_SMBUS_WORD_DATA |      \
                                        I2C_FUNC_SMBUS_I2C_BLOCK)
 
+/* Merrifield HCNT/LCNT/SDA hold time */
+static struct dw_scl_sda_cfg mrfld_config = {
+       .ss_hcnt = 0x2f8,
+       .fs_hcnt = 0x87,
+       .ss_lcnt = 0x37b,
+       .fs_lcnt = 0x10a,
+};
+
 /* BayTrail HCNT/LCNT/SDA hold time */
 static struct dw_scl_sda_cfg byt_config = {
        .ss_hcnt = 0x200,
@@ -112,6 +121,25 @@ static int mfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
        return -ENODEV;
 }
 
+static int mrfld_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
+{
+       /*
+        * On Intel Merrifield the i2c busses are enumerated [1..7]. So, we add
+        * 1 to shift the default range. Besides that the first PCI slot
+        * provides 4 functions, that's why we have to add 0 to the head slot
+        * and 4 to the tail one.
+        */
+       switch (PCI_SLOT(pdev->devfn)) {
+       case 8:
+               c->bus_num = PCI_FUNC(pdev->devfn) + 0 + 1;
+               return 0;
+       case 9:
+               c->bus_num = PCI_FUNC(pdev->devfn) + 4 + 1;
+               return 0;
+       }
+       return -ENODEV;
+}
+
 static struct dw_pci_controller dw_pci_controllers[] = {
        [medfield] = {
                .bus_num = -1,
@@ -121,6 +149,14 @@ static struct dw_pci_controller dw_pci_controllers[] = {
                .clk_khz      = 25000,
                .setup = mfld_setup,
        },
+       [merrifield] = {
+               .bus_num = -1,
+               .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+               .tx_fifo_depth = 64,
+               .rx_fifo_depth = 64,
+               .scl_sda_cfg = &mrfld_config,
+               .setup = mrfld_setup,
+       },
        [baytrail] = {
                .bus_num = -1,
                .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
@@ -269,6 +305,9 @@ static const struct pci_device_id i2_designware_pci_ids[] = {
        { PCI_VDEVICE(INTEL, 0x082C), medfield },
        { PCI_VDEVICE(INTEL, 0x082D), medfield },
        { PCI_VDEVICE(INTEL, 0x082E), medfield },
+       /* Merrifield */
+       { PCI_VDEVICE(INTEL, 0x1195), merrifield },
+       { PCI_VDEVICE(INTEL, 0x1196), merrifield },
        /* Baytrail */
        { PCI_VDEVICE(INTEL, 0x0F41), baytrail },
        { PCI_VDEVICE(INTEL, 0x0F42), baytrail },