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Subject[PATCH 17/24] thunderbolt: Add support for NHI mailbox
Date
The host controller includes two sets of registers that are used to
communicate with the firmware. Add functions that can be used to access
these registers.

This code is based on the work done by Amir Levy and Michael Jamet.

Signed-off-by: Michael Jamet <michael.jamet@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
---
drivers/thunderbolt/nhi.c | 58 ++++++++++++++++++++++++++++++++++++++++++
drivers/thunderbolt/nhi.h | 16 ++++++++++++
drivers/thunderbolt/nhi_regs.h | 11 ++++++++
3 files changed, 85 insertions(+)

diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index 1ebc845163c9..db9dca11e5db 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -14,6 +14,7 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/dmi.h>
+#include <linux/delay.h>

#include "nhi.h"
#include "nhi_regs.h"
@@ -28,6 +29,8 @@
#define MSIX_MIN_VECS 6
#define MSIX_MAX_VECS 16

+#define NHI_MAILBOX_TIMEOUT 500 /* ms */
+
static int ring_interrupt_index(struct tb_ring *ring)
{
int bit = ring->hop;
@@ -528,6 +531,61 @@ void ring_free(struct tb_ring *ring)
kfree(ring);
}

+/**
+ * nhi_mailbox_cmd() - Send a command through NHI mailbox
+ * @nhi: Pointer to the NHI structure
+ * @cmd: Command to send
+ * @data: Data to be send with the command
+ *
+ * Sends mailbox command to the firmware running on NHI. Returns %0 in
+ * case of success and negative errno in case of failure.
+ */
+int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data)
+{
+ ktime_t timeout;
+ u32 val;
+
+ iowrite32(data, nhi->iobase + REG_INMAIL_DATA);
+
+ val = ioread32(nhi->iobase + REG_INMAIL_CMD);
+ val &= ~(REG_INMAIL_CMD_MASK | REG_INMAIL_ERROR);
+ val |= REG_INMAIL_OP_REQUEST | cmd;
+ iowrite32(val, nhi->iobase + REG_INMAIL_CMD);
+
+ timeout = ktime_add_ms(ktime_get(), NHI_MAILBOX_TIMEOUT);
+ do {
+ val = ioread32(nhi->iobase + REG_INMAIL_CMD);
+ if (!(val & REG_INMAIL_OP_REQUEST))
+ break;
+ usleep_range(10, 20);
+ } while (ktime_before(ktime_get(), timeout));
+
+ if (val & REG_INMAIL_OP_REQUEST)
+ return -ETIMEDOUT;
+ if (val & REG_INMAIL_ERROR)
+ return -EIO;
+
+ return 0;
+}
+
+/**
+ * nhi_mailbox_mode() - Return current firmware operation mode
+ * @nhi: Pointer to the NHI structure
+ *
+ * The function reads current firmware operation mode using NHI mailbox
+ * registers and returns it to the caller.
+ */
+enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi)
+{
+ u32 val;
+
+ val = ioread32(nhi->iobase + REG_OUTMAIL_CMD);
+ val &= REG_OUTMAIL_CMD_OPMODE_MASK;
+ val >>= REG_OUTMAIL_CMD_OPMODE_SHIFT;
+
+ return (enum nhi_fw_mode)val;
+}
+
static void nhi_interrupt_work(struct work_struct *work)
{
struct tb_nhi *nhi = container_of(work, typeof(*nhi), interrupt_work);
diff --git a/drivers/thunderbolt/nhi.h b/drivers/thunderbolt/nhi.h
index 8a443ad67133..730ece3a8a5a 100644
--- a/drivers/thunderbolt/nhi.h
+++ b/drivers/thunderbolt/nhi.h
@@ -143,6 +143,22 @@ static inline int ring_tx(struct tb_ring *ring, struct ring_frame *frame)
return __ring_enqueue(ring, frame);
}

+enum nhi_fw_mode {
+ NHI_FW_SAFE_MODE,
+ NHI_FW_AUTH_MODE,
+ NHI_FW_EP_MODE,
+ NHI_FW_CM_MODE,
+};
+
+enum nhi_mailbox_cmd {
+ NHI_MAILBOX_SAVE_DEVS = 0x05,
+ NHI_MAILBOX_DRV_UNLOADS = 0x07,
+ NHI_MAILBOX_ALLOW_ALL_DEVS = 0x23,
+};
+
+int nhi_mailbox_cmd(struct tb_nhi *nhi, enum nhi_mailbox_cmd cmd, u32 data);
+enum nhi_fw_mode nhi_mailbox_mode(struct tb_nhi *nhi);
+
/*
* PCI IDs used in this driver from Alpine Ridge forward. There is no
* need for the PCI quirk anymore as we will use ICM also on Apple
diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h
index 48b98d3c7e6a..322fe1fa3a3c 100644
--- a/drivers/thunderbolt/nhi_regs.h
+++ b/drivers/thunderbolt/nhi_regs.h
@@ -107,4 +107,15 @@ struct ring_desc {
#define REG_DMA_MISC 0x39864
#define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2)

+#define REG_INMAIL_DATA 0x39900
+
+#define REG_INMAIL_CMD 0x39904
+#define REG_INMAIL_CMD_MASK GENMASK(7, 0)
+#define REG_INMAIL_ERROR BIT(30)
+#define REG_INMAIL_OP_REQUEST BIT(31)
+
+#define REG_OUTMAIL_CMD 0x3990c
+#define REG_OUTMAIL_CMD_OPMODE_SHIFT 8
+#define REG_OUTMAIL_CMD_OPMODE_MASK GENMASK(11, 8)
+
#endif
--
2.11.0
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