Initial import of abandoned HQEMU version 2.5.2HEADmaster

1 files changed, 741 insertions, 0 deletions

diff --git a/src/roms/u-boot/drivers/spi/ich.c b/src/roms/u-boot/drivers/spi/ich.c
new file mode 100644
index 0000000..f5c6f3e
--- /dev/null
+++ b/src/roms/u-boot/drivers/spi/ich.c
@@ -0,0 +1,741 @@
+/*
+ * Copyright (c) 2011-12 The Chromium OS Authors.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * 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;
+}