--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2020 NXP
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+#include <dm/device-internal.h>
+#include <asm/arch/s400_api.h>
+#include <linux/iopoll.h>
+#include <misc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct mu_type {
+ u32 ver;
+ u32 par;
+ u32 cr;
+ u32 sr;
+ u32 reserved0[68];
+ u32 tcr;
+ u32 tsr;
+ u32 rcr;
+ u32 rsr;
+ u32 reserved1[52];
+ u32 tr[16];
+ u32 reserved2[16];
+ u32 rr[16];
+ u32 reserved4[14];
+ u32 mu_attr;
+};
+
+struct imx8ulp_mu {
+ struct mu_type *base;
+};
+
+#define MU_SR_TE0_MASK BIT(0)
+#define MU_SR_RF0_MASK BIT(0)
+#define MU_TR_COUNT 4
+#define MU_RR_COUNT 4
+
+static inline void mu_hal_init(struct mu_type *base)
+{
+ writel(0, &base->tcr);
+ writel(0, &base->rcr);
+}
+
+static int mu_hal_sendmsg(struct mu_type *base, u32 reg_index, u32 msg)
+{
+ u32 mask = MU_SR_TE0_MASK << reg_index;
+ u32 val;
+ int ret;
+
+ assert(reg_index < MU_TR_COUNT);
+
+ debug("sendmsg sr 0x%x\n", readl(&base->sr));
+
+ /* Wait TX register to be empty. */
+ ret = readl_poll_timeout(&base->tsr, val, val & mask, 10000);
+ if (ret < 0) {
+ debug("%s timeout\n", __func__);
+ return -ETIMEDOUT;
+ }
+
+ debug("tr[%d] 0x%x\n", reg_index, msg);
+
+ writel(msg, &base->tr[reg_index]);
+
+ return 0;
+}
+
+static int mu_hal_receivemsg(struct mu_type *base, u32 reg_index, u32 *msg)
+{
+ u32 mask = MU_SR_RF0_MASK << reg_index;
+ u32 val;
+ int ret;
+
+ assert(reg_index < MU_TR_COUNT);
+
+ debug("receivemsg sr 0x%x\n", readl(&base->sr));
+
+ /* Wait RX register to be full. */
+ ret = readl_poll_timeout(&base->rsr, val, val & mask, 10000);
+ if (ret < 0) {
+ debug("%s timeout\n", __func__);
+ return -ETIMEDOUT;
+ }
+
+ *msg = readl(&base->rr[reg_index]);
+
+ debug("rr[%d] 0x%x\n", reg_index, *msg);
+
+ return 0;
+}
+
+static int imx8ulp_mu_read(struct mu_type *base, void *data)
+{
+ struct imx8ulp_s400_msg *msg = (struct imx8ulp_s400_msg *)data;
+ int ret;
+ u8 count = 0;
+
+ if (!msg)
+ return -EINVAL;
+
+ /* Read first word */
+ ret = mu_hal_receivemsg(base, 0, (u32 *)msg);
+ if (ret)
+ return ret;
+ count++;
+
+ /* Check size */
+ if (msg->size > S400_MAX_MSG) {
+ *((u32 *)msg) = 0;
+ return -EINVAL;
+ }
+
+ /* Read remaining words */
+ while (count < msg->size) {
+ ret = mu_hal_receivemsg(base, count % MU_RR_COUNT,
+ &msg->data[count - 1]);
+ if (ret)
+ return ret;
+ count++;
+ }
+
+ return 0;
+}
+
+static int imx8ulp_mu_write(struct mu_type *base, void *data)
+{
+ struct imx8ulp_s400_msg *msg = (struct imx8ulp_s400_msg *)data;
+ int ret;
+ u8 count = 0;
+
+ if (!msg)
+ return -EINVAL;
+
+ /* Check size */
+ if (msg->size > S400_MAX_MSG)
+ return -EINVAL;
+
+ /* Write first word */
+ ret = mu_hal_sendmsg(base, 0, *((u32 *)msg));
+ if (ret)
+ return ret;
+ count++;
+
+ /* Write remaining words */
+ while (count < msg->size) {
+ ret = mu_hal_sendmsg(base, count % MU_TR_COUNT,
+ msg->data[count - 1]);
+ if (ret)
+ return ret;
+ count++;
+ }
+
+ return 0;
+}
+
+/*
+ * Note the function prototype use msgid as the 2nd parameter, here
+ * we take it as no_resp.
+ */
+static int imx8ulp_mu_call(struct udevice *dev, int no_resp, void *tx_msg,
+ int tx_size, void *rx_msg, int rx_size)
+{
+ struct imx8ulp_mu *priv = dev_get_priv(dev);
+ u32 result;
+ int ret;
+
+ /* Expect tx_msg, rx_msg are the same value */
+ if (rx_msg && tx_msg != rx_msg)
+ printf("tx_msg %p, rx_msg %p\n", tx_msg, rx_msg);
+
+ ret = imx8ulp_mu_write(priv->base, tx_msg);
+ if (ret)
+ return ret;
+ if (!no_resp) {
+ ret = imx8ulp_mu_read(priv->base, rx_msg);
+ if (ret)
+ return ret;
+ }
+
+ result = ((struct imx8ulp_s400_msg *)rx_msg)->data[0];
+ if ((result & 0xff) == 0)
+ return 0;
+
+ return -EIO;
+}
+
+static int imx8ulp_mu_probe(struct udevice *dev)
+{
+ struct imx8ulp_mu *priv = dev_get_priv(dev);
+ fdt_addr_t addr;
+
+ debug("%s(dev=%p) (priv=%p)\n", __func__, dev, priv);
+
+ addr = devfdt_get_addr(dev);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ priv->base = (struct mu_type *)addr;
+
+ debug("mu base 0x%lx\n", (ulong)priv->base);
+
+ /* U-Boot not enable interrupts, so need to enable RX interrupts */
+ mu_hal_init(priv->base);
+
+ gd->arch.s400_dev = dev;
+
+ return 0;
+}
+
+static int imx8ulp_mu_remove(struct udevice *dev)
+{
+ return 0;
+}
+
+static int imx8ulp_mu_bind(struct udevice *dev)
+{
+ debug("%s(dev=%p)\n", __func__, dev);
+
+ return 0;
+}
+
+static struct misc_ops imx8ulp_mu_ops = {
+ .call = imx8ulp_mu_call,
+};
+
+static const struct udevice_id imx8ulp_mu_ids[] = {
+ { .compatible = "fsl,imx8ulp-mu" },
+ { }
+};
+
+U_BOOT_DRIVER(imx8ulp_mu) = {
+ .name = "imx8ulp_mu",
+ .id = UCLASS_MISC,
+ .of_match = imx8ulp_mu_ids,
+ .probe = imx8ulp_mu_probe,
+ .bind = imx8ulp_mu_bind,
+ .remove = imx8ulp_mu_remove,
+ .ops = &imx8ulp_mu_ops,
+ .priv_auto = sizeof(struct imx8ulp_mu),
+};
projects / u-boot.git / commitdiff
