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Wysocki" , Sanjay R Mehta , Nehal Bakulchandra Shah CC: , , , Lucas Tanure Subject: [PATCH 09/10] spi: amd: Add support for latest platform Date: Wed, 8 Sep 2021 12:34:50 +0100 Message-ID: <20210908113450.788452-10-tanureal@opensource.cirrus.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210908113450.788452-1-tanureal@opensource.cirrus.com> References: <20210908113450.788452-1-tanureal@opensource.cirrus.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Proofpoint-GUID: 4Rhr8vUr20dffprQCcGupmOFbl7JxjDO X-Proofpoint-ORIG-GUID: 4Rhr8vUr20dffprQCcGupmOFbl7JxjDO X-Proofpoint-Spam-Reason: safe Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nehal Bakulchandra Shah Add support for AMDI0062 controller Signed-off-by: Nehal Bakulchandra Shah Signed-off-by: Lucas Tanure --- drivers/spi/spi-amd.c | 128 ++++++++++++++++++++++++++++++++++-------- 1 file changed, 104 insertions(+), 24 deletions(-) diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c index 0face11740ea..788a5c42d811 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 +// Nehal Bakulchandra Shah // Lucas Tanure #include @@ -14,33 +15,48 @@ #include #include -#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; struct list_head rbuf_head; + 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); + int (*busy_wait)(struct amd_spi *amd_spi); }; struct amd_spi_read_buffer { @@ -90,16 +106,26 @@ 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); @@ -110,7 +136,7 @@ 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) { int timeout = 100000; @@ -124,11 +150,11 @@ static int amd_spi_busy_wait(struct amd_spi *amd_spi) return 0; } -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; - ret = amd_spi_busy_wait(amd_spi); + ret = amd_spi_busy_wait_v1(amd_spi); if (ret) return ret; @@ -138,6 +164,33 @@ static int amd_spi_execute_opcode(struct amd_spi *amd_spi) return 0; } +static int amd_spi_busy_wait_v2(struct amd_spi *amd_spi) +{ + int timeout = 100000; + + while (amd_spi_readreg32(amd_spi, AMD_SPI_STATUS_REG) & AMD_SPI_BUSY) { + usleep_range(10, 20); + if (timeout-- < 0) + return -ETIMEDOUT; + } + + return 0; +} + +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 0; +} + static int amd_spi_master_setup(struct spi_device *spi) { struct amd_spi *amd_spi = spi_master_get_devdata(spi->master); @@ -159,20 +212,21 @@ static void amd_spi_clear_list(struct amd_spi *amd_spi) static int amd_spi_transfer(struct amd_spi *amd_spi, u8 opcode, u8 tx_len, u8 rx_len, u8 fifo_pos) { + const struct amd_spi_devtype_data *priv = amd_spi->devtype_data; struct amd_spi_read_buffer *rbuf; struct list_head *p; int ret, i; - amd_spi_set_opcode(amd_spi, opcode); + priv->set_op(amd_spi, opcode); amd_spi_set_tx_count(amd_spi, tx_len); amd_spi_set_rx_count(amd_spi, rx_len); - ret = amd_spi_execute_opcode(amd_spi); + ret = priv->exec_op(amd_spi); if (ret) return ret; if (!list_empty(&amd_spi->rbuf_head)) { - ret = amd_spi_busy_wait(amd_spi); + ret = priv->busy_wait(amd_spi); if (ret) return ret; list_for_each(p, &amd_spi->rbuf_head) { @@ -262,6 +316,9 @@ static int amd_spi_transfer_one_message(struct spi_controller *ctrl, struct spi_ msg->status = ret; spi_finalize_current_message(ctrl); + if (amd_spi->devtype_data->version) + amd_spi_clear_chip(amd_spi, msg->spi->chip_select); + return ret; } @@ -293,6 +350,12 @@ 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; @@ -320,9 +383,25 @@ 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, + .busy_wait = amd_spi_busy_wait_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, + .busy_wait = amd_spi_busy_wait_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); @@ -340,4 +419,5 @@ module_platform_driver(amd_spi_driver); MODULE_LICENSE("Dual BSD/GPL"); MODULE_AUTHOR("Sanjay Mehta "); +MODULE_AUTHOR("Nehal Bakulchandra Shah "); MODULE_DESCRIPTION("AMD SPI Master Controller Driver"); -- 2.33.0