X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=drivers%2Fi2c%2Fintel_i2c.c;h=550a728cdcbce45230dbb71cd4c3009f96b26ca5;hb=622597dee4f66d5bd7dd5135d770077af04b0349;hp=1082d1a3ed61dd798bc8ace0488293f00a73a6ea;hpb=abb0b01e7a22c4a1f3fdd2301fae7276e857b04b;p=u-boot diff --git a/drivers/i2c/intel_i2c.c b/drivers/i2c/intel_i2c.c index 1082d1a3ed..550a728cdc 100644 --- a/drivers/i2c/intel_i2c.c +++ b/drivers/i2c/intel_i2c.c @@ -2,31 +2,291 @@ * Copyright (c) 2015 Google, Inc * Written by Simon Glass * + * SMBus block read/write support added by Stefan Roese: + * Copyright (C) 2016 Stefan Roese + * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include +#include #include -int intel_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) +/* PCI Configuration Space (D31:F3): SMBus */ +#define SMB_BASE 0x20 +#define HOSTC 0x40 +#define HST_EN (1 << 0) +#define SMB_RCV_SLVA 0x09 + +/* SMBus I/O bits. */ +#define SMBHSTSTAT 0x0 +#define SMBHSTCTL 0x2 +#define SMBHSTCMD 0x3 +#define SMBXMITADD 0x4 +#define SMBHSTDAT0 0x5 +#define SMBHSTDAT1 0x6 +#define SMBBLKDAT 0x7 +#define SMBTRNSADD 0x9 +#define SMBSLVDATA 0xa +#define SMBAUXCTL 0xd +#define SMLINK_PIN_CTL 0xe +#define SMBUS_PIN_CTL 0xf + +/* I801 Hosts Status register bits */ +#define SMBHSTSTS_BYTE_DONE 0x80 +#define SMBHSTSTS_INUSE_STS 0x40 +#define SMBHSTSTS_SMBALERT_STS 0x20 +#define SMBHSTSTS_FAILED 0x10 +#define SMBHSTSTS_BUS_ERR 0x08 +#define SMBHSTSTS_DEV_ERR 0x04 +#define SMBHSTSTS_INTR 0x02 +#define SMBHSTSTS_HOST_BUSY 0x01 + +/* I801 Host Control register bits */ +#define SMBHSTCNT_INTREN 0x01 +#define SMBHSTCNT_KILL 0x02 +#define SMBHSTCNT_LAST_BYTE 0x20 +#define SMBHSTCNT_START 0x40 +#define SMBHSTCNT_PEC_EN 0x80 /* ICH3 and later */ + +/* Auxiliary control register bits, ICH4+ only */ +#define SMBAUXCTL_CRC 1 +#define SMBAUXCTL_E32B 2 + +#define SMBUS_TIMEOUT 100 /* 100 ms */ + +struct intel_i2c { + u32 base; + int running; +}; + +static int smbus_wait_until_ready(u32 base) +{ + unsigned long ts; + u8 byte; + + ts = get_timer(0); + do { + byte = inb(base + SMBHSTSTAT); + if (!(byte & 1)) + return 0; + } while (get_timer(ts) < SMBUS_TIMEOUT); + + return -ETIMEDOUT; +} + +static int smbus_wait_until_done(u32 base) +{ + unsigned long ts; + u8 byte; + + ts = get_timer(0); + do { + byte = inb(base + SMBHSTSTAT); + if (!((byte & 1) || (byte & ~((1 << 6) | (1 << 0))) == 0)) + return 0; + } while (get_timer(ts) < SMBUS_TIMEOUT); + + return -ETIMEDOUT; +} + +static int smbus_block_read(u32 base, u8 dev, u8 *buffer, + int offset, int len) +{ + u8 buf_temp[32]; + int count; + int i; + + debug("%s (%d): dev=0x%x offs=0x%x len=0x%x\n", + __func__, __LINE__, dev, offset, len); + if (smbus_wait_until_ready(base) < 0) + return -ETIMEDOUT; + + /* Setup transaction */ + + /* Reset the data buffer index */ + inb(base + SMBHSTCTL); + + /* Set the device I'm talking too */ + outb(((dev & 0x7f) << 1) | 1, base + SMBXMITADD); + /* Set the command/address... */ + outb(offset & 0xff, base + SMBHSTCMD); + /* Set up for a block read */ + outb((inb(base + SMBHSTCTL) & (~(0x7) << 2)) | (0x5 << 2), + (base + SMBHSTCTL)); + /* Clear any lingering errors, so the transaction will run */ + outb(inb(base + SMBHSTSTAT), base + SMBHSTSTAT); + + /* Start the command */ + outb((inb(base + SMBHSTCTL) | SMBHSTCNT_START), base + SMBHSTCTL); + + /* Poll for transaction completion */ + if (smbus_wait_until_done(base) < 0) { + printf("SMBUS read transaction timeout (dev=0x%x)\n", dev); + return -ETIMEDOUT; + } + + count = inb(base + SMBHSTDAT0); + debug("%s (%d): count=%d (len=%d)\n", __func__, __LINE__, count, len); + if (count == 0) { + debug("ERROR: len=0 on read\n"); + return -EIO; + } + + if (count < len) { + debug("ERROR: too few bytes read\n"); + return -EIO; + } + + if (count > 32) { + debug("ERROR: count=%d too high\n", count); + return -EIO; + } + + /* Read all available bytes from buffer */ + for (i = 0; i < count; i++) + buf_temp[i] = inb(base + SMBBLKDAT); + + memcpy(buffer, buf_temp, len); + + /* Return results of transaction */ + if (!(inb(base + SMBHSTSTAT) & SMBHSTSTS_INTR)) + return -EIO; + + return 0; +} + +static int smbus_block_write(u32 base, u8 dev, u8 *buffer, + int offset, int len) { - return -ENOSYS; + int i; + + debug("%s (%d): dev=0x%x offs=0x%x len=0x%x\n", + __func__, __LINE__, dev, offset, len); + if (smbus_wait_until_ready(base) < 0) + return -ETIMEDOUT; + + /* Setup transaction */ + /* Set the device I'm talking too */ + outb(((dev & 0x7f) << 1) & ~0x01, base + SMBXMITADD); + /* Set the command/address... */ + outb(offset, base + SMBHSTCMD); + /* Set up for a block write */ + outb((inb(base + SMBHSTCTL) & (~(0x7) << 2)) | (0x5 << 2), + (base + SMBHSTCTL)); + /* Clear any lingering errors, so the transaction will run */ + outb(inb(base + SMBHSTSTAT), base + SMBHSTSTAT); + + /* Write count in DAT0 register */ + outb(len, base + SMBHSTDAT0); + + /* Write data bytes... */ + for (i = 0; i < len; i++) + outb(*buffer++, base + SMBBLKDAT); + + /* Start the command */ + outb((inb(base + SMBHSTCTL) | SMBHSTCNT_START), base + SMBHSTCTL); + + /* Poll for transaction completion */ + if (smbus_wait_until_done(base) < 0) { + printf("SMBUS write transaction timeout (dev=0x%x)\n", dev); + return -ETIMEDOUT; + } + + /* Return results of transaction */ + if (!(inb(base + SMBHSTSTAT) & SMBHSTSTS_INTR)) + return -EIO; + + return 0; +} + +static int intel_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) +{ + struct intel_i2c *i2c = dev_get_priv(bus); + struct i2c_msg *dmsg, *omsg, dummy; + + debug("i2c_xfer: %d messages\n", nmsgs); + + memset(&dummy, 0, sizeof(struct i2c_msg)); + + /* + * We expect either two messages (one with an offset and one with the + * actucal data) or one message (just data) + */ + if (nmsgs > 2 || nmsgs == 0) { + debug("%s: Only one or two messages are supported", __func__); + return -EIO; + } + + omsg = nmsgs == 1 ? &dummy : msg; + dmsg = nmsgs == 1 ? msg : msg + 1; + + if (dmsg->flags & I2C_M_RD) + return smbus_block_read(i2c->base, dmsg->addr, &dmsg->buf[0], + omsg->buf[0], dmsg->len); + else + return smbus_block_write(i2c->base, dmsg->addr, &dmsg->buf[1], + dmsg->buf[0], dmsg->len - 1); } -int intel_i2c_probe_chip(struct udevice *bus, uint chip_addr, uint chip_flags) +static int intel_i2c_probe_chip(struct udevice *bus, uint chip_addr, + uint chip_flags) { - return -ENOSYS; + struct intel_i2c *i2c = dev_get_priv(bus); + u8 buf[4]; + + return smbus_block_read(i2c->base, chip_addr, buf, 0, 1); } -int intel_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) +static int intel_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) { return 0; } static int intel_i2c_probe(struct udevice *dev) { + struct intel_i2c *priv = dev_get_priv(dev); + ulong base; + + /* Save base address from PCI BAR */ + priv->base = (ulong)dm_pci_map_bar(dev, PCI_BASE_ADDRESS_4, + PCI_REGION_IO); + base = priv->base; + + /* Set SMBus enable. */ + dm_pci_write_config8(dev, HOSTC, HST_EN); + + /* Disable interrupts */ + outb(inb(base + SMBHSTCTL) & ~SMBHSTCNT_INTREN, base + SMBHSTCTL); + + /* Set 32-byte data buffer mode */ + outb(inb(base + SMBAUXCTL) | SMBAUXCTL_E32B, base + SMBAUXCTL); + + return 0; +} + +static int intel_i2c_bind(struct udevice *dev) +{ + static int num_cards __attribute__ ((section(".data"))); + char name[20]; + + /* Create a unique device name for PCI type devices */ + if (device_is_on_pci_bus(dev)) { + /* + * ToDo: + * Setting req_seq in the driver is probably not recommended. + * But without a DT alias the number is not configured. And + * using this driver is impossible for PCIe I2C devices. + * This can be removed, once a better (correct) way for this + * is found and implemented. + */ + dev->req_seq = num_cards; + sprintf(name, "intel_i2c#%u", num_cards++); + device_set_name(dev, name); + } + return 0; } @@ -45,7 +305,18 @@ U_BOOT_DRIVER(intel_i2c) = { .name = "i2c_intel", .id = UCLASS_I2C, .of_match = intel_i2c_ids, - .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip), .ops = &intel_i2c_ops, + .priv_auto_alloc_size = sizeof(struct intel_i2c), + .bind = intel_i2c_bind, .probe = intel_i2c_probe, }; + +static struct pci_device_id intel_smbus_pci_supported[] = { + /* Intel BayTrail SMBus on the PCI bus */ + { PCI_VDEVICE(INTEL, 0x0f12) }, + /* Intel IvyBridge (Panther Point PCH) SMBus on the PCI bus */ + { PCI_VDEVICE(INTEL, 0x1e22) }, + {}, +}; + +U_BOOT_PCI_DEVICE(intel_i2c, intel_smbus_pci_supported);