[PATCH 9/9] spi: amd: Add support for latest platform
From: Lucas Tanure
Date: Tue Aug 24 2021 - 06:41:46 EST
Add support for AMDI0062 controllers
Signed-off-by: Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@xxxxxxx>
Signed-off-by: Lucas Tanure <tanureal@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-amd.c | 127 +++++++++++++++++++++++++++++++++---------
1 file changed, 100 insertions(+), 27 deletions(-)
diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c
index b6308733265e..cd0b38ead150 100644
--- a/drivers/spi/spi-amd.c
+++ b/drivers/spi/spi-amd.c
@@ -2,9 +2,10 @@
//
// AMD SPI controller driver
//
-// Copyright (c) 2020, Advanced Micro Devices, Inc.
+// Copyright (c) 2020-2021, Advanced Micro Devices, Inc.
//
// Authors: Sanjay R Mehta <sanju.mehta@xxxxxxx>
+// Nehal Bakulchandra Shah <nehal-bakulchandra.shah@xxxxxxx>
// Lucas Tanure <tanureal@xxxxxxxxxxxxxxxxxxxxx>
#include <linux/acpi.h>
@@ -15,32 +16,46 @@
#include <linux/spi/spi.h>
#include <linux/iopoll.h>
-#define AMD_SPI_CTRL0_REG 0x00
-#define AMD_SPI_EXEC_CMD BIT(16)
-#define AMD_SPI_FIFO_CLEAR BIT(20)
-#define AMD_SPI_BUSY BIT(31)
+#define AMD_SPI_CTRL0_REG 0x00
+#define AMD_SPI_EXEC_CMD BIT(16)
+#define AMD_SPI_FIFO_CLEAR BIT(20)
+#define AMD_SPI_BUSY BIT(31)
+#define AMD_SPI_ENABLE_REG 0x20
-#define AMD_SPI_OPCODE_MASK 0xFF
+#define AMD_SPI_DUMMY_CYCL_REG 0x32
+#define AMD_SPI_OPCODE_REG 0x45
+#define AMD_SPI_CMD_TRIGGER_REG 0x47
+#define AMD_SPI_TRIGGER_CMD BIT(7)
+#define AMD_SPI_OPCODE_MASK 0xFF
-#define AMD_SPI_ALT_CS_REG 0x1D
-#define AMD_SPI_ALT_CS_MASK 0x3
+#define AMD_SPI_ALT_CS_REG 0x1D
+#define AMD_SPI_ALT_CS_MASK GENMASK(1, 0)
-#define AMD_SPI_FIFO_BASE 0x80
-#define AMD_SPI_TX_COUNT_REG 0x48
-#define AMD_SPI_RX_COUNT_REG 0x4B
-#define AMD_SPI_STATUS_REG 0x4C
+#define AMD_SPI_FIFO_BASE 0x80
+#define AMD_SPI_TX_COUNT_REG 0x48
+#define AMD_SPI_RX_COUNT_REG 0x4B
+#define AMD_SPI_STATUS_REG 0x4C
-#define AMD_SPI_FIFO_SIZE 70
-#define AMD_SPI_MEM_SIZE 200
+#define AMD_SPI_FIFO_SIZE 70
+#define AMD_SPI_MEM_SIZE 200
/* M_CMD OP codes for SPI */
-#define AMD_SPI_XFER_TX 1
-#define AMD_SPI_XFER_RX 2
+#define AMD_SPI_XFER_TX 1
+#define AMD_SPI_XFER_RX 2
struct amd_spi {
void __iomem *io_remap_addr;
unsigned long io_base_addr;
u32 rom_addr;
+ const struct amd_spi_devtype_data *devtype_data;
+ struct spi_device *spi_dev;
+ struct spi_master *master;
+};
+
+struct amd_spi_devtype_data {
+ u8 version;
+ int (*exec_op)(struct amd_spi *amd_spi);
+ void (*set_op)(struct amd_spi *amd_spi, u8 cmd_opcode);
};
static inline u8 amd_spi_readreg8(struct amd_spi *amd_spi, int idx)
@@ -84,16 +99,26 @@ static void amd_spi_select_chip(struct amd_spi *amd_spi, u8 cs)
amd_spi_setclear_reg8(amd_spi, AMD_SPI_ALT_CS_REG, cs, AMD_SPI_ALT_CS_MASK);
}
+static inline void amd_spi_clear_chip(struct amd_spi *amd_spi, u8 chip_select)
+{
+ amd_spi_writereg8(amd_spi, AMD_SPI_ALT_CS_REG, chip_select & ~AMD_SPI_ALT_CS_MASK);
+}
+
static void amd_spi_clear_fifo_ptr(struct amd_spi *amd_spi)
{
amd_spi_setclear_reg32(amd_spi, AMD_SPI_CTRL0_REG, AMD_SPI_FIFO_CLEAR, AMD_SPI_FIFO_CLEAR);
}
-static void amd_spi_set_opcode(struct amd_spi *amd_spi, u8 cmd_opcode)
+static void amd_spi_set_opcode_v1(struct amd_spi *amd_spi, u8 cmd_opcode)
{
amd_spi_setclear_reg32(amd_spi, AMD_SPI_CTRL0_REG, cmd_opcode, AMD_SPI_OPCODE_MASK);
}
+static void amd_spi_set_opcode_v2(struct amd_spi *amd_spi, u8 cmd_opcode)
+{
+ amd_spi_writereg8(amd_spi, AMD_SPI_OPCODE_REG, cmd_opcode);
+}
+
static inline void amd_spi_set_rx_count(struct amd_spi *amd_spi, u8 rx_count)
{
amd_spi_setclear_reg8(amd_spi, AMD_SPI_RX_COUNT_REG, rx_count, 0xff);
@@ -104,7 +129,7 @@ static inline void amd_spi_set_tx_count(struct amd_spi *amd_spi, u8 tx_count)
amd_spi_setclear_reg8(amd_spi, AMD_SPI_TX_COUNT_REG, tx_count, 0xff);
}
-static int amd_spi_busy_wait(struct amd_spi *amd_spi)
+static int amd_spi_busy_wait_v1(struct amd_spi *amd_spi)
{
u32 val;
@@ -112,17 +137,39 @@ static int amd_spi_busy_wait(struct amd_spi *amd_spi)
!(val & AMD_SPI_BUSY), 10, 100000);
}
-static int amd_spi_execute_opcode(struct amd_spi *amd_spi)
+static int amd_spi_execute_opcode_v1(struct amd_spi *amd_spi)
{
- int ret = amd_spi_busy_wait(amd_spi);
+ int ret;
+ ret = amd_spi_busy_wait_v1(amd_spi);
if (ret)
return ret;
- /* Set ExecuteOpCode bit in the CTRL0 register */
amd_spi_setclear_reg32(amd_spi, AMD_SPI_CTRL0_REG, AMD_SPI_EXEC_CMD, AMD_SPI_EXEC_CMD);
- return amd_spi_busy_wait(amd_spi);
+ return amd_spi_busy_wait_v1(amd_spi);
+}
+
+static int amd_spi_busy_wait_v2(struct amd_spi *amd_spi)
+{
+ u32 val;
+
+ return readl_poll_timeout(amd_spi->io_remap_addr + AMD_SPI_STATUS_REG, val,
+ !(val & AMD_SPI_BUSY), 10, 1000);
+}
+
+static int amd_spi_execute_opcode_v2(struct amd_spi *amd_spi)
+{
+ int ret;
+
+ ret = amd_spi_busy_wait_v2(amd_spi);
+ if (ret)
+ return ret;
+
+ amd_spi_setclear_reg8(amd_spi, AMD_SPI_CMD_TRIGGER_REG, AMD_SPI_TRIGGER_CMD,
+ AMD_SPI_TRIGGER_CMD);
+
+ return amd_spi_busy_wait_v2(amd_spi);
}
static int amd_spi_master_setup(struct spi_device *spi)
@@ -138,6 +185,7 @@ static int amd_spi_double_write(struct spi_master *mst, u8 *tx1_buf, u8 tx1_len,
u8 tx2_len)
{
struct amd_spi *amd_spi = spi_master_get_devdata(mst);
+ const struct amd_spi_devtype_data *priv = amd_spi->devtype_data;
int i, ret;
if (tx1_len + tx2_len > AMD_SPI_FIFO_SIZE)
@@ -146,7 +194,7 @@ static int amd_spi_double_write(struct spi_master *mst, u8 *tx1_buf, u8 tx1_len,
amd_spi_clear_fifo_ptr(amd_spi);
amd_spi_set_rx_count(amd_spi, 0);
- amd_spi_set_opcode(amd_spi, tx1_buf[0]);
+ priv->set_op(amd_spi, tx1_buf[0]);
tx1_len--;
tx1_buf++;
@@ -157,7 +205,7 @@ static int amd_spi_double_write(struct spi_master *mst, u8 *tx1_buf, u8 tx1_len,
amd_spi_writereg8(amd_spi, (u8)(AMD_SPI_FIFO_BASE + tx1_len + i), tx2_buf[i]);
amd_spi_set_tx_count(amd_spi, tx1_len + tx2_len);
- ret = amd_spi_execute_opcode(amd_spi);
+ ret = priv->exec_op(amd_spi);
return ret ? ret : tx1_len + 1 + tx2_len;
}
@@ -165,6 +213,7 @@ static int amd_spi_double_write(struct spi_master *mst, u8 *tx1_buf, u8 tx1_len,
static int amd_spi_write_read(struct spi_master *mst, u8 *tx_buf, u8 tx_len, u8 *rx_buf, u8 rx_len)
{
struct amd_spi *amd_spi = spi_master_get_devdata(mst);
+ const struct amd_spi_devtype_data *priv = amd_spi->devtype_data;
int i, ret;
if (tx_len + rx_len > AMD_SPI_FIFO_SIZE)
@@ -174,7 +223,7 @@ static int amd_spi_write_read(struct spi_master *mst, u8 *tx_buf, u8 tx_len, u8
if (tx_buf) {
/* Take the first byte to be written and set as opcode */
- amd_spi_set_opcode(amd_spi, tx_buf[0]);
+ priv->set_op(amd_spi, tx_buf[0]);
/* Set TX count as the number of bytes to be written less one (opcode byte) */
tx_len--;
tx_buf++;
@@ -191,7 +240,7 @@ static int amd_spi_write_read(struct spi_master *mst, u8 *tx_buf, u8 tx_len, u8
amd_spi_set_rx_count(amd_spi, rx_buf ? rx_len : 0);
/* Trigger the transfer by executing the opcode */
- ret = amd_spi_execute_opcode(amd_spi);
+ ret = priv->exec_op(amd_spi);
if (ret)
return ret;
@@ -274,6 +323,9 @@ static int amd_spi_master_transfer(struct spi_master *mst, struct spi_message *m
msg->status = ret;
spi_finalize_current_message(mst);
+ if (amd_spi->devtype_data->version)
+ amd_spi_clear_chip(amd_spi, msg->spi->chip_select);
+
return ret;
}
@@ -305,6 +357,12 @@ static int amd_spi_probe(struct platform_device *pdev)
}
dev_dbg(dev, "io_remap_address: %p\n", amd_spi->io_remap_addr);
+ amd_spi->devtype_data = device_get_match_data(dev);
+ if (!amd_spi->devtype_data) {
+ err = -ENODEV;
+ goto err_free_master;
+ }
+
/* Initialize the spi_master fields */
master->bus_num = 0;
master->num_chipselect = 4;
@@ -329,9 +387,23 @@ static int amd_spi_probe(struct platform_device *pdev)
return err;
}
+static const struct amd_spi_devtype_data spi_v1 = {
+ .exec_op = amd_spi_execute_opcode_v1,
+ .set_op = amd_spi_set_opcode_v1,
+};
+
+static const struct amd_spi_devtype_data spi_v2 = {
+ .version = 1,
+ .exec_op = amd_spi_execute_opcode_v2,
+ .set_op = amd_spi_set_opcode_v2,
+};
+
#ifdef CONFIG_ACPI
static const struct acpi_device_id spi_acpi_match[] = {
- { "AMDI0061", 0 },
+ { "AMDI0061",
+ .driver_data = (kernel_ulong_t)&spi_v1 },
+ { "AMDI0062",
+ .driver_data = (kernel_ulong_t)&spi_v2 },
{},
};
MODULE_DEVICE_TABLE(acpi, spi_acpi_match);
@@ -349,4 +421,5 @@ module_platform_driver(amd_spi_driver);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Sanjay Mehta <sanju.mehta@xxxxxxx>");
+MODULE_AUTHOR("Nehal Bakulchandra Shah <nehal-bakulchandra.shah@xxxxxxx>");
MODULE_DESCRIPTION("AMD SPI Master Controller Driver");
--
2.33.0