On 27/02/23 22:05, Pierre-Louis Bossart wrote:
will fix it.
On 2/27/23 10:47, Vijendar Mukunda wrote:
AMD ACP(v6.x) IP block has two SoundWire manager devices.nit-pick: add a new line here since you're starting a different sequence.
Add support for
- Manager driver probe & remove sequence
- Helper functions to enable/disable interrupts,
Initialize sdw manager, enable sdw pads
- Manager driver sdw_master_ops & port_ops callbacks
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@xxxxxxx>
---
drivers/soundwire/amd_manager.c | 749 ++++++++++++++++++++++++++++++
drivers/soundwire/amd_manager.h | 252 ++++++++++
include/linux/soundwire/sdw_amd.h | 67 +++
3 files changed, 1068 insertions(+)
create mode 100644 drivers/soundwire/amd_manager.c
create mode 100644 drivers/soundwire/amd_manager.h
create mode 100644 include/linux/soundwire/sdw_amd.h
diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
new file mode 100644
index 000000000000..63cd8d066602
--- /dev/null
+++ b/drivers/soundwire/amd_manager.c
@@ -0,0 +1,749 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * SoundWire AMD Manager driver
+ *
+ * Copyright 2023 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <linux/wait.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include "bus.h"
+#include "amd_manager.h"
+
+#define DRV_NAME "amd_sdw_manager"
+
+#define to_amd_sdw(b) container_of(b, struct amd_sdw_manager, bus)
+
+static void amd_enable_sdw_pads(struct amd_sdw_manager *amd_manager)
+{
+ u32 sw_pad_pulldown_val;
+ u32 val;
+
+ mutex_lock(amd_manager->acp_sdw_lock);
+ val = acp_reg_readl(amd_manager->acp_mmio + ACP_SW_PAD_KEEPER_EN);
+ val |= amd_manager->reg_mask->sw_pad_enable_mask;
+ acp_reg_writel(val, amd_manager->acp_mmio + ACP_SW_PAD_KEEPER_EN);
+ usleep_range(1000, 1500);
+
+ sw_pad_pulldown_val = acp_reg_readl(amd_manager->acp_mmio + ACP_PAD_PULLDOWN_CTRL);
+ sw_pad_pulldown_val &= amd_manager->reg_mask->sw_pad_pulldown_mask;
+ acp_reg_writel(sw_pad_pulldown_val, amd_manager->acp_mmio + ACP_PAD_PULLDOWN_CTRL);
+ mutex_unlock(amd_manager->acp_sdw_lock);
+}
+
+static int amd_init_sdw_manager(struct amd_sdw_manager *amd_manager)
+{
+ u32 val;
+ u32 timeout = 0;
+ u32 retry_count = 0;
+
+ acp_reg_writel(AMD_SDW_ENABLE, amd_manager->mmio + ACP_SW_EN);
+ do {
+ val = acp_reg_readl(amd_manager->mmio + ACP_SW_EN_STATUS);
+ if (val)
+ break;
+ usleep_range(10, 20);
+ } while (retry_count++ < AMD_SDW_STAT_MAX_RETRY_COUNT);
+
+ if (retry_count > AMD_SDW_STAT_MAX_RETRY_COUNT)
+ return -ETIMEDOUT;
+
+ /* SoundWire manager bus reset */
+ acp_reg_writel(AMD_SDW_BUS_RESET_REQ, amd_manager->mmio + ACP_SW_BUS_RESET_CTRL);
+ val = acp_reg_readl(amd_manager->mmio + ACP_SW_BUS_RESET_CTRL);
+ while (!(val & AMD_SDW_BUS_RESET_DONE)) {
+ val = acp_reg_readl(amd_manager->mmio + ACP_SW_BUS_RESET_CTRL);
+ if (timeout > AMD_DELAY_LOOP_ITERATION)
+ break;
+ usleep_range(1, 5);
+ timeout++;
+ }
+ if (timeout > AMD_DELAY_LOOP_ITERATION)
+ return -ETIMEDOUT;
will fix it.+ timeout = 0;and same here, this is a new sequence starting here so a newline would help
+ acp_reg_writel(AMD_SDW_BUS_RESET_CLEAR_REQ, amd_manager->mmio + ACP_SW_BUS_RESET_CTRL);
+ val = acp_reg_readl(amd_manager->mmio + ACP_SW_BUS_RESET_CTRL);
+ while (val) {
+ val = acp_reg_readl(amd_manager->mmio + ACP_SW_BUS_RESET_CTRL);
+ if (timeout > AMD_DELAY_LOOP_ITERATION)
+ break;
+ usleep_range(1, 5);
+ timeout++;
+ }
+ if (timeout > AMD_DELAY_LOOP_ITERATION) {
+ dev_err(amd_manager->dev, "Failed to reset SoundWire manager instance%d\n",
+ amd_manager->instance);
+ return -ETIMEDOUT;
+ }
will fix it.+ retry_count = 0;nit-pick: this looks a bit messy, usually it's simpler to have
+ acp_reg_writel(AMD_SDW_DISABLE, amd_manager->mmio + ACP_SW_EN);
+ do {
+ val = acp_reg_readl(amd_manager->mmio + ACP_SW_EN_STATUS);
+ if (!val)
+ break;
+ usleep_range(10, 20);
+ } while (retry_count++ < AMD_SDW_STAT_MAX_RETRY_COUNT);
+
+ if (retry_count > AMD_SDW_STAT_MAX_RETRY_COUNT)
+ return -ETIMEDOUT;
+ return 0;
+}
+
+static int amd_enable_sdw_manager(struct amd_sdw_manager *amd_manager)
+{
+ u32 val;
+ u32 retry_count = 0;
+
+ acp_reg_writel(AMD_SDW_ENABLE, amd_manager->mmio + ACP_SW_EN);
+ do {
+ val = acp_reg_readl(amd_manager->mmio + ACP_SW_EN_STATUS);
+ if (val)
+ break;
+ usleep_range(10, 20);
+ } while (retry_count++ < AMD_SDW_STAT_MAX_RETRY_COUNT);
+
+ if (retry_count > AMD_SDW_STAT_MAX_RETRY_COUNT)
+ return -ETIMEDOUT;
+ return 0;
+}
+static void amd_sdw_ctl_word_prep(u32 *low_word, u32 *high_word, u32 cmd_type,
+ struct sdw_msg *msg, int cmd_offset)
+{
+ u32 low_data = 0, high_data;
+ u16 addr;
+ u8 addr_high, addr_low;
+ u8 data = 0;
initialized variables on separate lines. If you keep the low and high on
the same line, then at least use the same order.
will fix it.+nit-pick: resp_low? you seem to use this low/high pattern in a number of
+ addr = msg->addr + cmd_offset;
+ addr_high = (addr & 0xFF00) >> 8;
+ addr_low = addr & 0xFF;
+
+ if (cmd_type == AMD_SDW_CMD_WRITE)
+ data = msg->buf[cmd_offset];
+
+ high_data = FIELD_PREP(AMD_SDW_MCP_CMD_DEV_ADDR, msg->dev_num);
+ high_data |= FIELD_PREP(AMD_SDW_MCP_CMD_COMMAND, cmd_type);
+ high_data |= FIELD_PREP(AMD_SDW_MCP_CMD_REG_ADDR_HIGH, addr_high);
+ low_data |= FIELD_PREP(AMD_SDW_MCP_CMD_REG_ADDR_LOW, addr_low);
+ low_data |= FIELD_PREP(AMD_SDW_MCP_CMD_REG_DATA, data);
+
+ *high_word = high_data;
+ *low_word = low_data;
+}
+
+static u64 amd_sdw_send_cmd_get_resp(struct amd_sdw_manager *amd_manager, u32 lword, u32 uword)
+{
+ u64 resp;
+ u32 resp_lower, resp_high;
places.
will fix it.+ u32 sts;nit-pick: newline here.
+ u32 timeout = 0;
+
+ sts = acp_reg_readl(amd_manager->mmio + ACP_SW_IMM_CMD_STS);
+ while (sts & AMD_SDW_IMM_CMD_BUSY) {
+ if (timeout++ > AMD_SDW_RETRY_COUNT) {
+ dev_err(amd_manager->dev, "SDW%x previous cmd status clear failed\n",
+ amd_manager->instance);
+ return -ETIMEDOUT;
+ }
+ usleep_range(5, 10);
+ sts = acp_reg_readl(amd_manager->mmio + ACP_SW_IMM_CMD_STS);
+ }
+
+ timeout = 0;
+ if (sts & AMD_SDW_IMM_RES_VALID) {
+ dev_err(amd_manager->dev, "SDW%x manager is in bad state\n", amd_manager->instance);
+ acp_reg_writel(0x00, amd_manager->mmio + ACP_SW_IMM_CMD_STS);
+ }
+ acp_reg_writel(uword, amd_manager->mmio + ACP_SW_IMM_CMD_UPPER_WORD);
+ acp_reg_writel(lword, amd_manager->mmio + ACP_SW_IMM_CMD_LOWER_QWORD);
+
+ sts = acp_reg_readl(amd_manager->mmio + ACP_SW_IMM_CMD_STS);
+ while (!(sts & AMD_SDW_IMM_RES_VALID)) {
+ if (timeout++ > AMD_SDW_RETRY_COUNT) {
+ dev_err(amd_manager->dev, "SDW%x cmd response timeout occurred\n",
+ amd_manager->instance);
+ return -ETIMEDOUT;
+ }
+ usleep_range(5, 10);
+ sts = acp_reg_readl(amd_manager->mmio + ACP_SW_IMM_CMD_STS);
+ }
+ resp_high = acp_reg_readl(amd_manager->mmio + ACP_SW_IMM_RESP_UPPER_WORD);
+ resp_lower = acp_reg_readl(amd_manager->mmio + ACP_SW_IMM_RESP_LOWER_QWORD);
its high and low. Register naming convention uses+ timeout = 0;couldn't figure out what uword and lword refer to. Is this high/low as
+ acp_reg_writel(AMD_SDW_IMM_RES_VALID, amd_manager->mmio + ACP_SW_IMM_CMD_STS);
+ sts = acp_reg_readl(amd_manager->mmio + ACP_SW_IMM_CMD_STS);
+ while ((sts & AMD_SDW_IMM_RES_VALID)) {
+ if (timeout++ > AMD_SDW_RETRY_COUNT) {
+ dev_err(amd_manager->dev, "SDW%x cmd status retry failed\n",
+ amd_manager->instance);
+ return -ETIMEDOUT;
+ }
+ usleep_range(5, 10);
+ sts = acp_reg_readl(amd_manager->mmio + ACP_SW_IMM_CMD_STS);
+ }
+ resp = resp_high;
+ resp = (resp << 32) | resp_lower;
+ return resp;
+}
+static unsigned int _amd_sdw_xfer_msg(struct amd_sdw_manager *amd_manager, struct sdw_msg *msg,
+ int cmd, int cmd_offset)
+{
+ u64 response;
+ u32 uword = 0, lword = 0;
above or something else?
upper word and lower word. will use naming convention
throughout the code.
+
+ amd_sdw_ctl_word_prep(&lword, &uword, cmd, msg, cmd_offset);
+ response = amd_sdw_send_cmd_get_resp(amd_manager, lword, uword);
+ return amd_sdw_fill_msg_resp(amd_manager, msg, response, cmd_offset);
+}