SMBus on CS5536 support
This commit is contained in:
Vladimir 'phcoder' Serbinenko
parent
d9f31a41ca
commit
232f7e29c9
6 changed files with 419 additions and 1 deletions
213
bus/cs5536.c
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213
bus/cs5536.c
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/types.h>
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#include <grub/cs5536.h>
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#include <grub/pci.h>
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#include <grub/time.h>
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int
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grub_cs5536_find (grub_pci_device_t *devp)
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{
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int found = 0;
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auto int NESTED_FUNC_ATTR hook (grub_pci_device_t dev,
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grub_pci_id_t pciid);
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int NESTED_FUNC_ATTR hook (grub_pci_device_t dev,
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grub_pci_id_t pciid)
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{
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if (pciid == GRUB_CS5536_PCIID)
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{
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*devp = dev;
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found = 1;
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return 1;
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}
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return 0;
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}
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grub_pci_iterate (hook);
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return found;
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}
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grub_uint64_t
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grub_cs5536_read_msr (grub_pci_device_t dev, grub_uint32_t addr)
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{
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grub_uint64_t ret = 0;
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grub_pci_write (grub_pci_make_address (dev, GRUB_CS5536_MSR_MAILBOX_ADDR),
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addr);
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ret = (grub_uint64_t)
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grub_pci_read (grub_pci_make_address (dev, GRUB_CS5536_MSR_MAILBOX_DATA0));
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ret |= (((grub_uint64_t)
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grub_pci_read (grub_pci_make_address (dev,
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GRUB_CS5536_MSR_MAILBOX_DATA1)))
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<< 32);
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return ret;
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}
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void
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grub_cs5536_write_msr (grub_pci_device_t dev, grub_uint32_t addr,
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grub_uint64_t val)
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{
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grub_pci_write (grub_pci_make_address (dev, GRUB_CS5536_MSR_MAILBOX_ADDR),
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addr);
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grub_pci_write (grub_pci_make_address (dev, GRUB_CS5536_MSR_MAILBOX_DATA0),
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val & 0xffffffff);
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grub_pci_write (grub_pci_make_address (dev, GRUB_CS5536_MSR_MAILBOX_DATA1),
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val >> 32);
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}
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grub_err_t
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grub_cs5536_smbus_wait (grub_port_t smbbase)
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{
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grub_uint64_t start = grub_get_time_ms ();
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while (1)
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{
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grub_uint8_t status;
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status = grub_inb (smbbase + GRUB_CS5536_SMB_REG_STATUS);
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if (status & (1 << 6))
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return GRUB_ERR_NONE;
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if (status & (1 << 5))
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return grub_error (GRUB_ERR_IO, "SM bus error");
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if (status & (1 << 4))
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return grub_error (GRUB_ERR_IO, "NACK received");
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if (grub_get_time_ms () > start + 40)
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return grub_error (GRUB_ERR_IO, "SM stalled");
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}
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_cs5536_read_spd_byte (grub_port_t smbbase, grub_uint8_t dev,
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grub_uint8_t addr, grub_uint8_t *res)
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{
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grub_err_t err;
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/* Send START. */
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grub_outb (grub_inb (smbbase + GRUB_CS5536_SMB_REG_CTRL1)
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| GRUB_CS5536_SMB_REG_CTRL1_START,
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smbbase + GRUB_CS5536_SMB_REG_CTRL1);
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/* Send device address. */
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err = grub_cs5536_smbus_wait (smbbase);
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if (err)
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return err;
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grub_outb (dev << 1, smbbase + GRUB_CS5536_SMB_REG_DATA);
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/* Send ACK. */
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err = grub_cs5536_smbus_wait (smbbase);
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if (err)
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return err;
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grub_outb (grub_inb (smbbase + GRUB_CS5536_SMB_REG_CTRL1)
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| GRUB_CS5536_SMB_REG_CTRL1_ACK,
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smbbase + GRUB_CS5536_SMB_REG_CTRL1);
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/* Send byte address. */
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grub_outb (addr, smbbase + GRUB_CS5536_SMB_REG_DATA);
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/* Send START. */
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err = grub_cs5536_smbus_wait (smbbase);
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if (err)
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return err;
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grub_outb (grub_inb (smbbase + GRUB_CS5536_SMB_REG_CTRL1)
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| GRUB_CS5536_SMB_REG_CTRL1_START,
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smbbase + GRUB_CS5536_SMB_REG_CTRL1);
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/* Send device address. */
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err = grub_cs5536_smbus_wait (smbbase);
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if (err)
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return err;
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grub_outb ((dev << 1) | 1, smbbase + GRUB_CS5536_SMB_REG_DATA);
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/* Send STOP. */
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err = grub_cs5536_smbus_wait (smbbase);
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if (err)
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return err;
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grub_outb (grub_inb (smbbase + GRUB_CS5536_SMB_REG_CTRL1)
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| GRUB_CS5536_SMB_REG_CTRL1_STOP,
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smbbase + GRUB_CS5536_SMB_REG_CTRL1);
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err = grub_cs5536_smbus_wait (smbbase);
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if (err)
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return err;
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*res = grub_inb (smbbase + GRUB_CS5536_SMB_REG_DATA);
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_cs5536_init_smbus (grub_pci_device_t dev, grub_uint16_t divisor,
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grub_port_t *smbbase)
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{
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grub_uint64_t smbbar;
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smbbar = grub_cs5536_read_msr (dev, GRUB_CS5536_MSR_SMB_BAR);
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/* FIXME */
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if (!(smbbar & GRUB_CS5536_LBAR_ENABLE))
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return grub_error(GRUB_ERR_IO, "SMB controller not enabled\n");
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*smbbase = (smbbar & GRUB_CS5536_LBAR_ADDR_MASK) + GRUB_MACHINE_PCI_IO_BASE;
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if (divisor < 8)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "invalid divisor");
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/* Disable SMB. */
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grub_outb (0, *smbbase + GRUB_CS5536_SMB_REG_CTRL2);
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/* Disable interrupts. */
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grub_outb (0, *smbbase + GRUB_CS5536_SMB_REG_CTRL1);
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/* Set as master. */
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grub_outb (GRUB_CS5536_SMB_REG_ADDR_MASTER,
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*smbbase + GRUB_CS5536_SMB_REG_ADDR);
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/* Launch. */
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grub_outb (((divisor >> 7) & 0xff), *smbbase + GRUB_CS5536_SMB_REG_CTRL3);
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grub_outb (((divisor << 1) & 0xfe) | GRUB_CS5536_SMB_REG_CTRL2_ENABLE,
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*smbbase + GRUB_CS5536_SMB_REG_CTRL2);
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_cs5536_read_spd (grub_port_t smbbase, grub_uint8_t dev,
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struct grub_smbus_spd *res)
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{
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grub_err_t err;
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grub_size_t size;
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grub_uint8_t b;
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grub_size_t ptr;
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err = grub_cs5536_read_spd_byte (smbbase, dev, 0, &b);
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if (err)
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return err;
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if (b == 0)
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return grub_error (GRUB_ERR_IO, "no SPD found");
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size = b;
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((grub_uint8_t *) res)[0] = b;
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for (ptr = 1; ptr < size; ptr++)
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{
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err = grub_cs5536_read_spd_byte (smbbase, dev, ptr,
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&((grub_uint8_t *) res)[ptr]);
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if (err)
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return err;
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}
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return GRUB_ERR_NONE;
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}
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