summaryrefslogtreecommitdiff
path: root/drivers/spi/ich.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/spi/ich.c')
-rw-r--r--drivers/spi/ich.c754
1 files changed, 754 insertions, 0 deletions
diff --git a/drivers/spi/ich.c b/drivers/spi/ich.c
new file mode 100644
index 0000000000..8865df5bef
--- /dev/null
+++ b/drivers/spi/ich.c
@@ -0,0 +1,754 @@
+/*
+ * Copyright (c) 2011-12 The Chromium OS Authors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * This file is derived from the flashrom project.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <spi.h>
+#include <pci.h>
+#include <pci_ids.h>
+#include <asm/io.h>
+
+#include "ich.h"
+
+#define SPI_OPCODE_WREN 0x06
+#define SPI_OPCODE_FAST_READ 0x0b
+
+struct ich_ctlr {
+ pci_dev_t dev; /* PCI device number */
+ int ich_version; /* Controller version, 7 or 9 */
+ int ichspi_lock;
+ int locked;
+ uint8_t *opmenu;
+ int menubytes;
+ void *base; /* Base of register set */
+ uint16_t *preop;
+ uint16_t *optype;
+ uint32_t *addr;
+ uint8_t *data;
+ unsigned databytes;
+ uint8_t *status;
+ uint16_t *control;
+ uint32_t *bbar;
+ uint32_t *pr; /* only for ich9 */
+ uint8_t *speed; /* pointer to speed control */
+ ulong max_speed; /* Maximum bus speed in MHz */
+};
+
+struct ich_ctlr ctlr;
+
+static inline struct ich_spi_slave *to_ich_spi(struct spi_slave *slave)
+{
+ return container_of(slave, struct ich_spi_slave, slave);
+}
+
+static unsigned int ich_reg(const void *addr)
+{
+ return (unsigned)(addr - ctlr.base) & 0xffff;
+}
+
+static u8 ich_readb(const void *addr)
+{
+ u8 value = readb(addr);
+
+ debug("read %2.2x from %4.4x\n", value, ich_reg(addr));
+
+ return value;
+}
+
+static u16 ich_readw(const void *addr)
+{
+ u16 value = readw(addr);
+
+ debug("read %4.4x from %4.4x\n", value, ich_reg(addr));
+
+ return value;
+}
+
+static u32 ich_readl(const void *addr)
+{
+ u32 value = readl(addr);
+
+ debug("read %8.8x from %4.4x\n", value, ich_reg(addr));
+
+ return value;
+}
+
+static void ich_writeb(u8 value, void *addr)
+{
+ writeb(value, addr);
+ debug("wrote %2.2x to %4.4x\n", value, ich_reg(addr));
+}
+
+static void ich_writew(u16 value, void *addr)
+{
+ writew(value, addr);
+ debug("wrote %4.4x to %4.4x\n", value, ich_reg(addr));
+}
+
+static void ich_writel(u32 value, void *addr)
+{
+ writel(value, addr);
+ debug("wrote %8.8x to %4.4x\n", value, ich_reg(addr));
+}
+
+static void write_reg(const void *value, void *dest, uint32_t size)
+{
+ memcpy_toio(dest, value, size);
+}
+
+static void read_reg(const void *src, void *value, uint32_t size)
+{
+ memcpy_fromio(value, src, size);
+}
+
+static void ich_set_bbar(struct ich_ctlr *ctlr, uint32_t minaddr)
+{
+ const uint32_t bbar_mask = 0x00ffff00;
+ uint32_t ichspi_bbar;
+
+ minaddr &= bbar_mask;
+ ichspi_bbar = ich_readl(ctlr->bbar) & ~bbar_mask;
+ ichspi_bbar |= minaddr;
+ ich_writel(ichspi_bbar, ctlr->bbar);
+}
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ puts("spi_cs_is_valid used but not implemented\n");
+ return 0;
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+ unsigned int max_hz, unsigned int mode)
+{
+ struct ich_spi_slave *ich;
+
+ ich = spi_alloc_slave(struct ich_spi_slave, bus, cs);
+ if (!ich) {
+ puts("ICH SPI: Out of memory\n");
+ return NULL;
+ }
+
+ /*
+ * Yes this controller can only write a small number of bytes at
+ * once! The limit is typically 64 bytes.
+ */
+ ich->slave.max_write_size = ctlr.databytes;
+ ich->speed = max_hz;
+
+ return &ich->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+ struct ich_spi_slave *ich = to_ich_spi(slave);
+
+ free(ich);
+}
+
+/*
+ * Check if this device ID matches one of supported Intel PCH devices.
+ *
+ * Return the ICH version if there is a match, or zero otherwise.
+ */
+static int get_ich_version(uint16_t device_id)
+{
+ if (device_id == PCI_DEVICE_ID_INTEL_TGP_LPC)
+ return 7;
+
+ if ((device_id >= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MIN &&
+ device_id <= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MAX) ||
+ (device_id >= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MIN &&
+ device_id <= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MAX))
+ return 9;
+
+ return 0;
+}
+
+/* @return 1 if the SPI flash supports the 33MHz speed */
+static int ich9_can_do_33mhz(pci_dev_t dev)
+{
+ u32 fdod, speed;
+
+ /* Observe SPI Descriptor Component Section 0 */
+ pci_write_config_dword(dev, 0xb0, 0x1000);
+
+ /* Extract the Write/Erase SPI Frequency from descriptor */
+ pci_read_config_dword(dev, 0xb4, &fdod);
+
+ /* Bits 23:21 have the fast read clock frequency, 0=20MHz, 1=33MHz */
+ speed = (fdod >> 21) & 7;
+
+ return speed == 1;
+}
+
+static int ich_find_spi_controller(pci_dev_t *devp, int *ich_versionp)
+{
+ int last_bus = pci_last_busno();
+ int bus;
+
+ if (last_bus == -1) {
+ debug("No PCI busses?\n");
+ return -1;
+ }
+
+ for (bus = 0; bus <= last_bus; bus++) {
+ uint16_t vendor_id, device_id;
+ uint32_t ids;
+ pci_dev_t dev;
+
+ dev = PCI_BDF(bus, 31, 0);
+ pci_read_config_dword(dev, 0, &ids);
+ vendor_id = ids;
+ device_id = ids >> 16;
+
+ if (vendor_id == PCI_VENDOR_ID_INTEL) {
+ *devp = dev;
+ *ich_versionp = get_ich_version(device_id);
+ return 0;
+ }
+ }
+
+ debug("ICH SPI: No ICH found.\n");
+ return -1;
+}
+
+static int ich_init_controller(struct ich_ctlr *ctlr)
+{
+ uint8_t *rcrb; /* Root Complex Register Block */
+ uint32_t rcba; /* Root Complex Base Address */
+
+ pci_read_config_dword(ctlr->dev, 0xf0, &rcba);
+ /* Bits 31-14 are the base address, 13-1 are reserved, 0 is enable. */
+ rcrb = (uint8_t *)(rcba & 0xffffc000);
+ if (ctlr->ich_version == 7) {
+ struct ich7_spi_regs *ich7_spi;
+
+ ich7_spi = (struct ich7_spi_regs *)(rcrb + 0x3020);
+ ctlr->ichspi_lock = ich_readw(&ich7_spi->spis) & SPIS_LOCK;
+ ctlr->opmenu = ich7_spi->opmenu;
+ ctlr->menubytes = sizeof(ich7_spi->opmenu);
+ ctlr->optype = &ich7_spi->optype;
+ ctlr->addr = &ich7_spi->spia;
+ ctlr->data = (uint8_t *)ich7_spi->spid;
+ ctlr->databytes = sizeof(ich7_spi->spid);
+ ctlr->status = (uint8_t *)&ich7_spi->spis;
+ ctlr->control = &ich7_spi->spic;
+ ctlr->bbar = &ich7_spi->bbar;
+ ctlr->preop = &ich7_spi->preop;
+ ctlr->base = ich7_spi;
+ } else if (ctlr->ich_version == 9) {
+ struct ich9_spi_regs *ich9_spi;
+
+ ich9_spi = (struct ich9_spi_regs *)(rcrb + 0x3800);
+ ctlr->ichspi_lock = ich_readw(&ich9_spi->hsfs) & HSFS_FLOCKDN;
+ ctlr->opmenu = ich9_spi->opmenu;
+ ctlr->menubytes = sizeof(ich9_spi->opmenu);
+ ctlr->optype = &ich9_spi->optype;
+ ctlr->addr = &ich9_spi->faddr;
+ ctlr->data = (uint8_t *)ich9_spi->fdata;
+ ctlr->databytes = sizeof(ich9_spi->fdata);
+ ctlr->status = &ich9_spi->ssfs;
+ ctlr->control = (uint16_t *)ich9_spi->ssfc;
+ ctlr->speed = ich9_spi->ssfc + 2;
+ ctlr->bbar = &ich9_spi->bbar;
+ ctlr->preop = &ich9_spi->preop;
+ ctlr->pr = &ich9_spi->pr[0];
+ ctlr->base = ich9_spi;
+ } else {
+ debug("ICH SPI: Unrecognized ICH version %d.\n",
+ ctlr->ich_version);
+ return -1;
+ }
+ debug("ICH SPI: Version %d detected\n", ctlr->ich_version);
+
+ /* Work out the maximum speed we can support */
+ ctlr->max_speed = 20000000;
+ if (ctlr->ich_version == 9 && ich9_can_do_33mhz(ctlr->dev))
+ ctlr->max_speed = 33000000;
+
+ ich_set_bbar(ctlr, 0);
+
+ return 0;
+}
+
+void spi_init(void)
+{
+ uint8_t bios_cntl;
+
+ if (ich_find_spi_controller(&ctlr.dev, &ctlr.ich_version)) {
+ printf("ICH SPI: Cannot find device\n");
+ return;
+ }
+
+ if (ich_init_controller(&ctlr)) {
+ printf("ICH SPI: Cannot setup controller\n");
+ return;
+ }
+
+ /*
+ * Disable the BIOS write protect so write commands are allowed. On
+ * v9, deassert SMM BIOS Write Protect Disable.
+ */
+ pci_read_config_byte(ctlr.dev, 0xdc, &bios_cntl);
+ if (ctlr.ich_version == 9)
+ bios_cntl &= ~(1 << 5);
+ pci_write_config_byte(ctlr.dev, 0xdc, bios_cntl | 0x1);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+ /* Handled by ICH automatically. */
+ return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+ /* Handled by ICH automatically. */
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+ /* Handled by ICH automatically. */
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+ /* Handled by ICH automatically. */
+}
+
+static inline void spi_use_out(struct spi_trans *trans, unsigned bytes)
+{
+ trans->out += bytes;
+ trans->bytesout -= bytes;
+}
+
+static inline void spi_use_in(struct spi_trans *trans, unsigned bytes)
+{
+ trans->in += bytes;
+ trans->bytesin -= bytes;
+}
+
+static void spi_setup_type(struct spi_trans *trans, int data_bytes)
+{
+ trans->type = 0xFF;
+
+ /* Try to guess spi type from read/write sizes. */
+ if (trans->bytesin == 0) {
+ if (trans->bytesout + data_bytes > 4)
+ /*
+ * If bytesin = 0 and bytesout > 4, we presume this is
+ * a write data operation, which is accompanied by an
+ * address.
+ */
+ trans->type = SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS;
+ else
+ trans->type = SPI_OPCODE_TYPE_WRITE_NO_ADDRESS;
+ return;
+ }
+
+ if (trans->bytesout == 1) { /* and bytesin is > 0 */
+ trans->type = SPI_OPCODE_TYPE_READ_NO_ADDRESS;
+ return;
+ }
+
+ if (trans->bytesout == 4) /* and bytesin is > 0 */
+ trans->type = SPI_OPCODE_TYPE_READ_WITH_ADDRESS;
+
+ /* Fast read command is called with 5 bytes instead of 4 */
+ if (trans->out[0] == SPI_OPCODE_FAST_READ && trans->bytesout == 5) {
+ trans->type = SPI_OPCODE_TYPE_READ_WITH_ADDRESS;
+ --trans->bytesout;
+ }
+}
+
+static int spi_setup_opcode(struct spi_trans *trans)
+{
+ uint16_t optypes;
+ uint8_t opmenu[ctlr.menubytes];
+
+ trans->opcode = trans->out[0];
+ spi_use_out(trans, 1);
+ if (!ctlr.ichspi_lock) {
+ /* The lock is off, so just use index 0. */
+ ich_writeb(trans->opcode, ctlr.opmenu);
+ optypes = ich_readw(ctlr.optype);
+ optypes = (optypes & 0xfffc) | (trans->type & 0x3);
+ ich_writew(optypes, ctlr.optype);
+ return 0;
+ } else {
+ /* The lock is on. See if what we need is on the menu. */
+ uint8_t optype;
+ uint16_t opcode_index;
+
+ /* Write Enable is handled as atomic prefix */
+ if (trans->opcode == SPI_OPCODE_WREN)
+ return 0;
+
+ read_reg(ctlr.opmenu, opmenu, sizeof(opmenu));
+ for (opcode_index = 0; opcode_index < ctlr.menubytes;
+ opcode_index++) {
+ if (opmenu[opcode_index] == trans->opcode)
+ break;
+ }
+
+ if (opcode_index == ctlr.menubytes) {
+ printf("ICH SPI: Opcode %x not found\n",
+ trans->opcode);
+ return -1;
+ }
+
+ optypes = ich_readw(ctlr.optype);
+ optype = (optypes >> (opcode_index * 2)) & 0x3;
+ if (trans->type == SPI_OPCODE_TYPE_WRITE_NO_ADDRESS &&
+ optype == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS &&
+ trans->bytesout >= 3) {
+ /* We guessed wrong earlier. Fix it up. */
+ trans->type = optype;
+ }
+ if (optype != trans->type) {
+ printf("ICH SPI: Transaction doesn't fit type %d\n",
+ optype);
+ return -1;
+ }
+ return opcode_index;
+ }
+}
+
+static int spi_setup_offset(struct spi_trans *trans)
+{
+ /* Separate the SPI address and data. */
+ switch (trans->type) {
+ case SPI_OPCODE_TYPE_READ_NO_ADDRESS:
+ case SPI_OPCODE_TYPE_WRITE_NO_ADDRESS:
+ return 0;
+ case SPI_OPCODE_TYPE_READ_WITH_ADDRESS:
+ case SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS:
+ trans->offset = ((uint32_t)trans->out[0] << 16) |
+ ((uint32_t)trans->out[1] << 8) |
+ ((uint32_t)trans->out[2] << 0);
+ spi_use_out(trans, 3);
+ return 1;
+ default:
+ printf("Unrecognized SPI transaction type %#x\n", trans->type);
+ return -1;
+ }
+}
+
+/*
+ * Wait for up to 6s til status register bit(s) turn 1 (in case wait_til_set
+ * below is True) or 0. In case the wait was for the bit(s) to set - write
+ * those bits back, which would cause resetting them.
+ *
+ * Return the last read status value on success or -1 on failure.
+ */
+static int ich_status_poll(u16 bitmask, int wait_til_set)
+{
+ int timeout = 600000; /* This will result in 6s */
+ u16 status = 0;
+
+ while (timeout--) {
+ status = ich_readw(ctlr.status);
+ if (wait_til_set ^ ((status & bitmask) == 0)) {
+ if (wait_til_set)
+ ich_writew((status & bitmask), ctlr.status);
+ return status;
+ }
+ udelay(10);
+ }
+
+ printf("ICH SPI: SCIP timeout, read %x, expected %x\n",
+ status, bitmask);
+ return -1;
+}
+
+/*
+int spi_xfer(struct spi_slave *slave, const void *dout,
+ unsigned int bitsout, void *din, unsigned int bitsin)
+*/
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+ void *din, unsigned long flags)
+{
+ struct ich_spi_slave *ich = to_ich_spi(slave);
+ uint16_t control;
+ int16_t opcode_index;
+ int with_address;
+ int status;
+ int bytes = bitlen / 8;
+ struct spi_trans *trans = &ich->trans;
+ unsigned type = flags & (SPI_XFER_BEGIN | SPI_XFER_END);
+ int using_cmd = 0;
+ /* Align read transactions to 64-byte boundaries */
+ char buff[ctlr.databytes];
+
+ /* Ee don't support writing partial bytes. */
+ if (bitlen % 8) {
+ debug("ICH SPI: Accessing partial bytes not supported\n");
+ return -1;
+ }
+
+ /* An empty end transaction can be ignored */
+ if (type == SPI_XFER_END && !dout && !din)
+ return 0;
+
+ if (type & SPI_XFER_BEGIN)
+ memset(trans, '\0', sizeof(*trans));
+
+ /* Dp we need to come back later to finish it? */
+ if (dout && type == SPI_XFER_BEGIN) {
+ if (bytes > ICH_MAX_CMD_LEN) {
+ debug("ICH SPI: Command length limit exceeded\n");
+ return -1;
+ }
+ memcpy(trans->cmd, dout, bytes);
+ trans->cmd_len = bytes;
+ debug("ICH SPI: Saved %d bytes\n", bytes);
+ return 0;
+ }
+
+ /*
+ * We process a 'middle' spi_xfer() call, which has no
+ * SPI_XFER_BEGIN/END, as an independent transaction as if it had
+ * an end. We therefore repeat the command. This is because ICH
+ * seems to have no support for this, or because interest (in digging
+ * out the details and creating a special case in the code) is low.
+ */
+ if (trans->cmd_len) {
+ trans->out = trans->cmd;
+ trans->bytesout = trans->cmd_len;
+ using_cmd = 1;
+ debug("ICH SPI: Using %d bytes\n", trans->cmd_len);
+ } else {
+ trans->out = dout;
+ trans->bytesout = dout ? bytes : 0;
+ }
+
+ trans->in = din;
+ trans->bytesin = din ? bytes : 0;
+
+ /* There has to always at least be an opcode. */
+ if (!trans->bytesout) {
+ debug("ICH SPI: No opcode for transfer\n");
+ return -1;
+ }
+
+ if (ich_status_poll(SPIS_SCIP, 0) == -1)
+ return -1;
+
+ ich_writew(SPIS_CDS | SPIS_FCERR, ctlr.status);
+
+ spi_setup_type(trans, using_cmd ? bytes : 0);
+ opcode_index = spi_setup_opcode(trans);
+ if (opcode_index < 0)
+ return -1;
+ with_address = spi_setup_offset(trans);
+ if (with_address < 0)
+ return -1;
+
+ if (trans->opcode == SPI_OPCODE_WREN) {
+ /*
+ * Treat Write Enable as Atomic Pre-Op if possible
+ * in order to prevent the Management Engine from
+ * issuing a transaction between WREN and DATA.
+ */
+ if (!ctlr.ichspi_lock)
+ ich_writew(trans->opcode, ctlr.preop);
+ return 0;
+ }
+
+ if (ctlr.speed && ctlr.max_speed >= 33000000) {
+ int byte;
+
+ byte = ich_readb(ctlr.speed);
+ if (ich->speed >= 33000000)
+ byte |= SSFC_SCF_33MHZ;
+ else
+ byte &= ~SSFC_SCF_33MHZ;
+ ich_writeb(byte, ctlr.speed);
+ }
+
+ /* See if we have used up the command data */
+ if (using_cmd && dout && bytes) {
+ trans->out = dout;
+ trans->bytesout = bytes;
+ debug("ICH SPI: Moving to data, %d bytes\n", bytes);
+ }
+
+ /* Preset control fields */
+ control = ich_readw(ctlr.control);
+ control &= ~SSFC_RESERVED;
+ control = SPIC_SCGO | ((opcode_index & 0x07) << 4);
+
+ /* Issue atomic preop cycle if needed */
+ if (ich_readw(ctlr.preop))
+ control |= SPIC_ACS;
+
+ if (!trans->bytesout && !trans->bytesin) {
+ /* SPI addresses are 24 bit only */
+ if (with_address)
+ ich_writel(trans->offset & 0x00FFFFFF, ctlr.addr);
+
+ /*
+ * This is a 'no data' command (like Write Enable), its
+ * bitesout size was 1, decremented to zero while executing
+ * spi_setup_opcode() above. Tell the chip to send the
+ * command.
+ */
+ ich_writew(control, ctlr.control);
+
+ /* wait for the result */
+ status = ich_status_poll(SPIS_CDS | SPIS_FCERR, 1);
+ if (status == -1)
+ return -1;
+
+ if (status & SPIS_FCERR) {
+ debug("ICH SPI: Command transaction error\n");
+ return -1;
+ }
+
+ return 0;
+ }
+
+ /*
+ * Check if this is a write command atempting to transfer more bytes
+ * than the controller can handle. Iterations for writes are not
+ * supported here because each SPI write command needs to be preceded
+ * and followed by other SPI commands, and this sequence is controlled
+ * by the SPI chip driver.
+ */
+ if (trans->bytesout > ctlr.databytes) {
+ debug("ICH SPI: Too much to write. This should be prevented by the driver's max_write_size?\n");
+ return -1;
+ }
+
+ /*
+ * Read or write up to databytes bytes at a time until everything has
+ * been sent.
+ */
+ while (trans->bytesout || trans->bytesin) {
+ uint32_t data_length;
+ uint32_t aligned_offset;
+ uint32_t diff;
+
+ aligned_offset = trans->offset & ~(ctlr.databytes - 1);
+ diff = trans->offset - aligned_offset;
+
+ /* SPI addresses are 24 bit only */
+ ich_writel(aligned_offset & 0x00FFFFFF, ctlr.addr);
+
+ if (trans->bytesout)
+ data_length = min(trans->bytesout, ctlr.databytes);
+ else
+ data_length = min(trans->bytesin, ctlr.databytes);
+
+ /* Program data into FDATA0 to N */
+ if (trans->bytesout) {
+ write_reg(trans->out, ctlr.data, data_length);
+ spi_use_out(trans, data_length);
+ if (with_address)
+ trans->offset += data_length;
+ }
+
+ /* Add proper control fields' values */
+ control &= ~((ctlr.databytes - 1) << 8);
+ control |= SPIC_DS;
+ control |= (data_length - 1) << 8;
+
+ /* write it */
+ ich_writew(control, ctlr.control);
+
+ /* Wait for Cycle Done Status or Flash Cycle Error. */
+ status = ich_status_poll(SPIS_CDS | SPIS_FCERR, 1);
+ if (status == -1)
+ return -1;
+
+ if (status & SPIS_FCERR) {
+ debug("ICH SPI: Data transaction error\n");
+ return -1;
+ }
+
+ if (trans->bytesin) {
+ if (diff) {
+ data_length -= diff;
+ read_reg(ctlr.data, buff, ctlr.databytes);
+ memcpy(trans->in, buff + diff, data_length);
+ } else {
+ read_reg(ctlr.data, trans->in, data_length);
+ }
+ spi_use_in(trans, data_length);
+ if (with_address)
+ trans->offset += data_length;
+ }
+ }
+
+ /* Clear atomic preop now that xfer is done */
+ ich_writew(0, ctlr.preop);
+
+ return 0;
+}
+
+
+/*
+ * This uses the SPI controller from the Intel Cougar Point and Panther Point
+ * PCH to write-protect portions of the SPI flash until reboot. The changes
+ * don't actually take effect until the HSFS[FLOCKDN] bit is set, but that's
+ * done elsewhere.
+ */
+int spi_write_protect_region(uint32_t lower_limit, uint32_t length, int hint)
+{
+ uint32_t tmplong;
+ uint32_t upper_limit;
+
+ if (!ctlr.pr) {
+ printf("%s: operation not supported on this chipset\n",
+ __func__);
+ return -1;
+ }
+
+ if (length == 0 ||
+ lower_limit > (0xFFFFFFFFUL - length) + 1 ||
+ hint < 0 || hint > 4) {
+ printf("%s(0x%x, 0x%x, %d): invalid args\n", __func__,
+ lower_limit, length, hint);
+ return -1;
+ }
+
+ upper_limit = lower_limit + length - 1;
+
+ /*
+ * Determine bits to write, as follows:
+ * 31 Write-protection enable (includes erase operation)
+ * 30:29 reserved
+ * 28:16 Upper Limit (FLA address bits 24:12, with 11:0 == 0xfff)
+ * 15 Read-protection enable
+ * 14:13 reserved
+ * 12:0 Lower Limit (FLA address bits 24:12, with 11:0 == 0x000)
+ */
+ tmplong = 0x80000000 |
+ ((upper_limit & 0x01fff000) << 4) |
+ ((lower_limit & 0x01fff000) >> 12);
+
+ printf("%s: writing 0x%08x to %p\n", __func__, tmplong,
+ &ctlr.pr[hint]);
+ ctlr.pr[hint] = tmplong;
+
+ return 0;
+}
generated by cgit (git 2.34.1) at 2024-12-25 07:50:24 +0000