msm: gsi: add support for generic commands

Expose a new API from GSI driver to allow client driver to
disable channel for other Execution Environment.
This API will be used as part of SSR cleanup.

Change-Id: I3b9400643aff76ca2195a597aba9ea18aab3085e
CRs-Fixed: 2008582
Acked-by: Ady Abrahan <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>

3 files changed, 97 insertions, 6 deletions

diff --git a/drivers/platform/msm/gsi/gsi.c b/drivers/platform/msm/gsi/gsi.c
index 188388bc97a0..23b0428bcf34 100644
--- a/drivers/platform/msm/gsi/gsi.c
+++ b/drivers/platform/msm/gsi/gsi.c
@@ -264,6 +264,11 @@ static void gsi_handle_glob_err(uint32_t err)
 	}
 }
 
+static void gsi_handle_gp_int1(void)
+{
+	complete(&gsi_ctx->gen_ee_cmd_compl);
+}
+
 static void gsi_handle_glob_ee(int ee)
 {
 	uint32_t val;
@@ -288,8 +293,7 @@ static void gsi_handle_glob_ee(int ee)
 	}
 
 	if (val & GSI_EE_n_CNTXT_GLOB_IRQ_EN_GP_INT1_BMSK) {
-		notify.evt_id = GSI_PER_EVT_GLOB_GP1;
-		gsi_ctx->per.notify_cb(&notify);
+		gsi_handle_gp_int1();
 	}
 
 	if (val & GSI_EE_n_CNTXT_GLOB_IRQ_EN_GP_INT2_BMSK) {
@@ -2745,6 +2749,67 @@ void gsi_get_inst_ram_offset_and_size(unsigned long *base_offset,
 }
 EXPORT_SYMBOL(gsi_get_inst_ram_offset_and_size);
 
+int gsi_halt_channel_ee(unsigned int chan_idx, unsigned int ee, int *code)
+{
+	enum gsi_generic_ee_cmd_opcode op = GSI_GEN_EE_CMD_HALT_CHANNEL;
+	uint32_t val;
+	int res;
+
+	if (!gsi_ctx) {
+		pr_err("%s:%d gsi context not allocated\n", __func__, __LINE__);
+		return -GSI_STATUS_NODEV;
+	}
+
+	if (chan_idx >= gsi_ctx->max_ch || !code) {
+		GSIERR("bad params chan_idx=%d\n", chan_idx);
+		return -GSI_STATUS_INVALID_PARAMS;
+	}
+
+	mutex_lock(&gsi_ctx->mlock);
+	reinit_completion(&gsi_ctx->gen_ee_cmd_compl);
+
+	/* invalidate the response */
+	gsi_ctx->scratch.word0.val = gsi_readl(gsi_ctx->base +
+			GSI_EE_n_CNTXT_SCRATCH_0_OFFS(gsi_ctx->per.ee));
+	gsi_ctx->scratch.word0.s.generic_ee_cmd_return_code = 0;
+	gsi_writel(gsi_ctx->scratch.word0.val, gsi_ctx->base +
+			GSI_EE_n_CNTXT_SCRATCH_0_OFFS(gsi_ctx->per.ee));
+
+	gsi_ctx->gen_ee_cmd_dbg.halt_channel++;
+	val = (((op << GSI_EE_n_GSI_EE_GENERIC_CMD_OPCODE_SHFT) &
+		GSI_EE_n_GSI_EE_GENERIC_CMD_OPCODE_BMSK) |
+		((chan_idx << GSI_EE_n_GSI_EE_GENERIC_CMD_VIRT_CHAN_IDX_SHFT) &
+			GSI_EE_n_GSI_EE_GENERIC_CMD_VIRT_CHAN_IDX_BMSK) |
+		((ee << GSI_EE_n_GSI_EE_GENERIC_CMD_EE_SHFT) &
+			GSI_EE_n_GSI_EE_GENERIC_CMD_EE_BMSK));
+	gsi_writel(val, gsi_ctx->base +
+		GSI_EE_n_GSI_EE_GENERIC_CMD_OFFS(gsi_ctx->per.ee));
+
+	res = wait_for_completion_timeout(&gsi_ctx->gen_ee_cmd_compl,
+		msecs_to_jiffies(GSI_CMD_TIMEOUT));
+	if (res == 0) {
+		GSIERR("chan_idx=%u ee=%u timed out\n", chan_idx, ee);
+		res = -GSI_STATUS_TIMED_OUT;
+		goto free_lock;
+	}
+
+	gsi_ctx->scratch.word0.val = gsi_readl(gsi_ctx->base +
+		GSI_EE_n_CNTXT_SCRATCH_0_OFFS(gsi_ctx->per.ee));
+	if (gsi_ctx->scratch.word0.s.generic_ee_cmd_return_code == 0) {
+		GSIERR("No response received\n");
+		res = -GSI_STATUS_ERROR;
+		goto free_lock;
+	}
+
+	res = GSI_STATUS_SUCCESS;
+	*code = gsi_ctx->scratch.word0.s.generic_ee_cmd_return_code;
+free_lock:
+	mutex_unlock(&gsi_ctx->mlock);
+
+	return res;
+}
+EXPORT_SYMBOL(gsi_halt_channel_ee);
+
 static int msm_gsi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -2757,6 +2822,7 @@ static int msm_gsi_probe(struct platform_device *pdev)
 	}
 
 	gsi_ctx->dev = dev;
+	init_completion(&gsi_ctx->gen_ee_cmd_compl);
 	gsi_debugfs_init();
 
 	return 0;
diff --git a/drivers/platform/msm/gsi/gsi.h b/drivers/platform/msm/gsi/gsi.h
index 750ae2b329d3..d0eb162c49cf 100644
--- a/drivers/platform/msm/gsi/gsi.h
+++ b/drivers/platform/msm/gsi/gsi.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -115,9 +115,12 @@ struct gsi_evt_ctx {
 struct gsi_ee_scratch {
 	union __packed {
 		struct {
-			uint32_t resvd1:15;
+			uint32_t inter_ee_cmd_return_code:3;
+			uint32_t resvd1:2;
+			uint32_t generic_ee_cmd_return_code:3;
+			uint32_t resvd2:7;
 			uint32_t max_usb_pkt_size:1;
-			uint32_t resvd2:8;
+			uint32_t resvd3:8;
 			uint32_t mhi_base_chan_idx:8;
 		} s;
 		uint32_t val;
@@ -135,6 +138,10 @@ struct ch_debug_stats {
 	unsigned long cmd_completed;
 };
 
+struct gsi_generic_ee_cmd_debug_stats {
+	unsigned long halt_channel;
+};
+
 struct gsi_ctx {
 	void __iomem *base;
 	struct device *dev;
@@ -143,6 +150,7 @@ struct gsi_ctx {
 	struct gsi_chan_ctx chan[GSI_CHAN_MAX];
 	struct ch_debug_stats ch_dbg[GSI_CHAN_MAX];
 	struct gsi_evt_ctx evtr[GSI_EVT_RING_MAX];
+	struct gsi_generic_ee_cmd_debug_stats gen_ee_cmd_dbg;
 	struct mutex mlock;
 	spinlock_t slock;
 	unsigned long evt_bmap;
@@ -154,6 +162,7 @@ struct gsi_ctx {
 	struct workqueue_struct *dp_stat_wq;
 	u32 max_ch;
 	u32 max_ev;
+	struct completion gen_ee_cmd_compl;
 };
 
 enum gsi_re_type {
@@ -227,6 +236,18 @@ enum gsi_evt_ch_cmd_opcode {
 	GSI_EVT_DE_ALLOC = 0xa,
 };
 
+enum gsi_generic_ee_cmd_opcode {
+	GSI_GEN_EE_CMD_HALT_CHANNEL = 0x1,
+};
+
+enum gsi_generic_ee_cmd_return_code {
+	GSI_GEN_EE_CMD_RETURN_CODE_SUCCESS = 0x1,
+	GSI_GEN_EE_CMD_RETURN_CODE_CHANNEL_NOT_RUNNING = 0x2,
+	GSI_GEN_EE_CMD_RETURN_CODE_INCORRECT_DIRECTION = 0x3,
+	GSI_GEN_EE_CMD_RETURN_CODE_INCORRECT_CHANNEL_TYPE = 0x4,
+	GSI_GEN_EE_CMD_RETURN_CODE_INCORRECT_CHANNEL_INDEX = 0x5,
+};
+
 extern struct gsi_ctx *gsi_ctx;
 void gsi_debugfs_init(void);
 uint16_t gsi_find_idx_from_addr(struct gsi_ring_ctx *ctx, uint64_t addr);
diff --git a/drivers/platform/msm/gsi/gsi_reg.h b/drivers/platform/msm/gsi/gsi_reg.h
index 1acaf74a0968..d0462aad72d2 100644
--- a/drivers/platform/msm/gsi/gsi_reg.h
+++ b/drivers/platform/msm/gsi/gsi_reg.h
@@ -1365,8 +1365,12 @@
 	(GSI_GSI_REG_BASE_OFFS + 0x0001f018 + 0x4000 * (n))
 #define GSI_EE_n_GSI_EE_GENERIC_CMD_RMSK 0xffffffff
 #define GSI_EE_n_GSI_EE_GENERIC_CMD_MAXn 3
-#define GSI_EE_n_GSI_EE_GENERIC_CMD_OPCODE_BMSK 0xffffffff
+#define GSI_EE_n_GSI_EE_GENERIC_CMD_OPCODE_BMSK 0x1f
 #define GSI_EE_n_GSI_EE_GENERIC_CMD_OPCODE_SHFT 0x0
+#define GSI_EE_n_GSI_EE_GENERIC_CMD_VIRT_CHAN_IDX_BMSK 0x3e0
+#define GSI_EE_n_GSI_EE_GENERIC_CMD_VIRT_CHAN_IDX_SHFT 0x5
+#define GSI_EE_n_GSI_EE_GENERIC_CMD_EE_BMSK 0x3c00
+#define GSI_EE_n_GSI_EE_GENERIC_CMD_EE_SHFT 0xa
 
 /* v1.0 */
 #define GSI_V1_0_EE_n_GSI_HW_PARAM_OFFS(n) \