Unverified Commit 20904355 authored by André Almeida's avatar André Almeida Committed by Mark Brown
Browse files

spi: amd: Add support for version AMDI0062 



Add support for the AMD SPI controller version AMDI0062. Do this in a
modular way where's easy to add new versions.

Signed-off-by: default avatarAndré Almeida <andrealmeid@collabora.com>
Link: https://lore.kernel.org/r/20220211143155.75513-4-andrealmeid@collabora.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent fbc71367

drivers/spi/spi-amd.c

+71 −10
Original line number Diff line number Diff line
@@ -19,6 +19,10 @@ 
#define AMD_SPI_FIFO_CLEAR	BIT(20)

#define AMD_SPI_BUSY		BIT(31)



#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
@@ -35,9 +39,15 @@ 
#define AMD_SPI_XFER_TX		1

#define AMD_SPI_XFER_RX		2



enum amd_spi_versions {

	AMD_SPI_V1 = 1,	/* AMDI0061 */

	AMD_SPI_V2,	/* AMDI0062 */

};



struct amd_spi {

	void __iomem *io_remap_addr;

	unsigned long io_base_addr;

	enum amd_spi_versions version;

};



static inline u8 amd_spi_readreg8(struct amd_spi *amd_spi, int idx)
@@ -81,14 +91,29 @@ 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 int amd_spi_set_opcode(struct amd_spi *amd_spi, u8 cmd_opcode)

{

	amd_spi_setclear_reg32(amd_spi, AMD_SPI_CTRL0_REG, cmd_opcode, AMD_SPI_OPCODE_MASK);

	switch (amd_spi->version) {

	case AMD_SPI_V1:

		amd_spi_setclear_reg32(amd_spi, AMD_SPI_CTRL0_REG, cmd_opcode,

				       AMD_SPI_OPCODE_MASK);

		return 0;

	case AMD_SPI_V2:

		amd_spi_writereg8(amd_spi, AMD_SPI_OPCODE_REG, cmd_opcode);

		return 0;

	default:

		return -ENODEV;

	}

}



static inline void amd_spi_set_rx_count(struct amd_spi *amd_spi, u8 rx_count)
@@ -104,9 +129,21 @@ static inline void amd_spi_set_tx_count(struct amd_spi *amd_spi, u8 tx_count) 
static int amd_spi_busy_wait(struct amd_spi *amd_spi)

{

	u32 val;

	int reg;



	switch (amd_spi->version) {

	case AMD_SPI_V1:

		reg = AMD_SPI_CTRL0_REG;

		break;

	case AMD_SPI_V2:

		reg = AMD_SPI_STATUS_REG;

		break;

	default:

		return -ENODEV;

	}



	return readl_poll_timeout(amd_spi->io_remap_addr + AMD_SPI_CTRL0_REG,

				  val, !(val & AMD_SPI_BUSY), 20, 2000000);

	return readl_poll_timeout(amd_spi->io_remap_addr + reg, val,

				  !(val & AMD_SPI_BUSY), 20, 2000000);

}



static int amd_spi_execute_opcode(struct amd_spi *amd_spi)
@@ -117,10 +154,20 @@ static int amd_spi_execute_opcode(struct amd_spi *amd_spi) 
	if (ret)

		return ret;



	switch (amd_spi->version) {

	case AMD_SPI_V1:

		/* 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);



		amd_spi_setclear_reg32(amd_spi, AMD_SPI_CTRL0_REG, AMD_SPI_EXEC_CMD,

				       AMD_SPI_EXEC_CMD);

		return 0;

	case AMD_SPI_V2:

		/* Trigger the command execution */

		amd_spi_setclear_reg8(amd_spi, AMD_SPI_CMD_TRIGGER_REG,

				      AMD_SPI_TRIGGER_CMD, AMD_SPI_TRIGGER_CMD);

		return 0;

	default:

		return -ENODEV;

	}

}



static int amd_spi_master_setup(struct spi_device *spi)
@@ -190,6 +237,17 @@ static inline int amd_spi_fifo_xfer(struct amd_spi *amd_spi, 
	message->actual_length = tx_len + rx_len + 1;

	/* complete the transaction */

	message->status = 0;



	switch (amd_spi->version) {

	case AMD_SPI_V1:

		break;

	case AMD_SPI_V2:

		amd_spi_clear_chip(amd_spi, message->spi->chip_select);

		break;

	default:

		return -ENODEV;

	}



	spi_finalize_current_message(master);



	return 0;
@@ -235,6 +293,8 @@ static int amd_spi_probe(struct platform_device *pdev) 
	}

	dev_dbg(dev, "io_remap_address: %p\n", amd_spi->io_remap_addr);



	amd_spi->version = (enum amd_spi_versions) device_get_match_data(dev);



	/* Initialize the spi_master fields */

	master->bus_num = 0;

	master->num_chipselect = 4;
@@ -260,7 +320,8 @@ static int amd_spi_probe(struct platform_device *pdev) 


#ifdef CONFIG_ACPI

static const struct acpi_device_id spi_acpi_match[] = {

	{ "AMDI0061", 0 },

	{ "AMDI0061", AMD_SPI_V1 },

	{ "AMDI0062", AMD_SPI_V2 },

	{},

};

MODULE_DEVICE_TABLE(acpi, spi_acpi_match);
@@ -269,7 +330,7 @@ MODULE_DEVICE_TABLE(acpi, spi_acpi_match); 
static struct platform_driver amd_spi_driver = {

	.driver = {

		.name = "amd_spi",

		.acpi_match_table = ACPI_PTR(spi_acpi_match),

		.acpi_match_table = spi_acpi_match,

	},

	.probe = amd_spi_probe,

};