+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2011-12 The Chromium OS Authors.
*
- * SPDX-License-Identifier: GPL-2.0+
- *
* This file is derived from the flashrom project.
*/
trans->bytesin -= bytes;
}
+static void spi_lock_down(struct ich_spi_platdata *plat, void *sbase)
+{
+ if (plat->ich_version == ICHV_7) {
+ struct ich7_spi_regs *ich7_spi = sbase;
+
+ setbits_le16(&ich7_spi->spis, SPIS_LOCK);
+ } else if (plat->ich_version == ICHV_9) {
+ struct ich9_spi_regs *ich9_spi = sbase;
+
+ setbits_le16(&ich9_spi->hsfs, HSFS_FLOCKDN);
+ }
+}
+
static bool spi_lock_status(struct ich_spi_platdata *plat, void *sbase)
{
int lock = 0;
return -ETIMEDOUT;
}
+void ich_spi_config_opcode(struct udevice *dev)
+{
+ struct ich_spi_priv *ctlr = dev_get_priv(dev);
+
+ /*
+ * PREOP, OPTYPE, OPMENU1/OPMENU2 registers can be locked down
+ * to prevent accidental or intentional writes. Before they get
+ * locked down, these registers should be initialized properly.
+ */
+ ich_writew(ctlr, SPI_OPPREFIX, ctlr->preop);
+ ich_writew(ctlr, SPI_OPTYPE, ctlr->optype);
+ ich_writel(ctlr, SPI_OPMENU_LOWER, ctlr->opmenu);
+ ich_writel(ctlr, SPI_OPMENU_UPPER, ctlr->opmenu + sizeof(u32));
+}
+
static int ich_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
}
/* Preset control fields */
- control = ich_readw(ctlr, ctlr->control);
- control &= ~SSFC_RESERVED;
control = SPIC_SCGO | ((opcode_index & 0x07) << 4);
/* Issue atomic preop cycle if needed */
}
/* Clear atomic preop now that xfer is done */
- ich_writew(ctlr, 0, ctlr->preop);
+ if (!lock)
+ ich_writew(ctlr, 0, ctlr->preop);
return 0;
}
return ret;
}
+ /* Lock down SPI controller settings if required */
+ if (plat->lockdown) {
+ ich_spi_config_opcode(dev);
+ spi_lock_down(plat, priv->base);
+ }
+
priv->cur_speed = priv->max_speed;
return 0;
static int ich_spi_remove(struct udevice *bus)
{
- struct ich_spi_priv *ctlr = dev_get_priv(bus);
-
/*
* Configure SPI controller so that the Linux MTD driver can fully
* access the SPI NOR chip
*/
- ich_writew(ctlr, SPI_OPPREFIX, ctlr->preop);
- ich_writew(ctlr, SPI_OPTYPE, ctlr->optype);
- ich_writel(ctlr, SPI_OPMENU_LOWER, ctlr->opmenu);
- ich_writel(ctlr, SPI_OPMENU_UPPER, ctlr->opmenu + sizeof(u32));
+ ich_spi_config_opcode(bus);
return 0;
}
plat->ich_version = ICHV_9;
}
+ plat->lockdown = fdtdec_get_bool(gd->fdt_blob, node,
+ "intel,spi-lock-down");
+
return ret;
}