diff options
| -rw-r--r-- | drivers/iio/dac/adi-axi-dac.c | 256 |
1 files changed, 242 insertions, 14 deletions
diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c index 04193a98616e..c2cd8abc3342 100644 --- a/drivers/iio/dac/adi-axi-dac.c +++ b/drivers/iio/dac/adi-axi-dac.c @@ -46,9 +46,28 @@ #define AXI_DAC_CNTRL_1_REG 0x0044 #define AXI_DAC_CNTRL_1_SYNC BIT(0) #define AXI_DAC_CNTRL_2_REG 0x0048 +#define AXI_DAC_CNTRL_2_SDR_DDR_N BIT(16) +#define AXI_DAC_CNTRL_2_SYMB_8B BIT(14) #define ADI_DAC_CNTRL_2_R1_MODE BIT(5) +#define AXI_DAC_CNTRL_2_UNSIGNED_DATA BIT(4) +#define AXI_DAC_STATUS_1_REG 0x0054 +#define AXI_DAC_STATUS_2_REG 0x0058 #define AXI_DAC_DRP_STATUS_REG 0x0074 #define AXI_DAC_DRP_STATUS_DRP_LOCKED BIT(17) +#define AXI_DAC_CUSTOM_RD_REG 0x0080 +#define AXI_DAC_CUSTOM_WR_REG 0x0084 +#define AXI_DAC_CUSTOM_WR_DATA_8 GENMASK(23, 16) +#define AXI_DAC_CUSTOM_WR_DATA_16 GENMASK(23, 8) +#define AXI_DAC_UI_STATUS_REG 0x0088 +#define AXI_DAC_UI_STATUS_IF_BUSY BIT(4) +#define AXI_DAC_CUSTOM_CTRL_REG 0x008C +#define AXI_DAC_CUSTOM_CTRL_ADDRESS GENMASK(31, 24) +#define AXI_DAC_CUSTOM_CTRL_SYNCED_TRANSFER BIT(2) +#define AXI_DAC_CUSTOM_CTRL_STREAM BIT(1) +#define AXI_DAC_CUSTOM_CTRL_TRANSFER_DATA BIT(0) + +#define AXI_DAC_CUSTOM_CTRL_STREAM_ENABLE (AXI_DAC_CUSTOM_CTRL_TRANSFER_DATA | \ + AXI_DAC_CUSTOM_CTRL_STREAM) /* DAC Channel controls */ #define AXI_DAC_CHAN_CNTRL_1_REG(c) (0x0400 + (c) * 0x40) @@ -63,12 +82,21 @@ #define AXI_DAC_CHAN_CNTRL_7_REG(c) (0x0418 + (c) * 0x40) #define AXI_DAC_CHAN_CNTRL_7_DATA_SEL GENMASK(3, 0) +#define AXI_DAC_RD_ADDR(x) (BIT(7) | (x)) + /* 360 degrees in rad */ #define AXI_DAC_2_PI_MEGA 6283190 enum { AXI_DAC_DATA_INTERNAL_TONE, AXI_DAC_DATA_DMA = 2, + AXI_DAC_DATA_INTERNAL_RAMP_16BIT = 11, +}; + +struct axi_dac_info { + unsigned int version; + const struct iio_backend_info *backend_info; + bool has_dac_clk; }; struct axi_dac_state { @@ -79,9 +107,11 @@ struct axi_dac_state { * data/variables. */ struct mutex lock; + const struct axi_dac_info *info; u64 dac_clk; u32 reg_config; bool int_tone; + int dac_clk_rate; }; static int axi_dac_enable(struct iio_backend *back) @@ -471,6 +501,11 @@ static int axi_dac_data_source_set(struct iio_backend *back, unsigned int chan, AXI_DAC_CHAN_CNTRL_7_REG(chan), AXI_DAC_CHAN_CNTRL_7_DATA_SEL, AXI_DAC_DATA_DMA); + case IIO_BACKEND_INTERNAL_RAMP_16BIT: + return regmap_update_bits(st->regmap, + AXI_DAC_CHAN_CNTRL_7_REG(chan), + AXI_DAC_CHAN_CNTRL_7_DATA_SEL, + AXI_DAC_DATA_INTERNAL_RAMP_16BIT); default: return -EINVAL; } @@ -528,6 +563,154 @@ static int axi_dac_reg_access(struct iio_backend *back, unsigned int reg, return regmap_write(st->regmap, reg, writeval); } +static int axi_dac_ddr_enable(struct iio_backend *back) +{ + struct axi_dac_state *st = iio_backend_get_priv(back); + + return regmap_clear_bits(st->regmap, AXI_DAC_CNTRL_2_REG, + AXI_DAC_CNTRL_2_SDR_DDR_N); +} + +static int axi_dac_ddr_disable(struct iio_backend *back) +{ + struct axi_dac_state *st = iio_backend_get_priv(back); + + return regmap_set_bits(st->regmap, AXI_DAC_CNTRL_2_REG, + AXI_DAC_CNTRL_2_SDR_DDR_N); +} + +static int axi_dac_data_stream_enable(struct iio_backend *back) +{ + struct axi_dac_state *st = iio_backend_get_priv(back); + + return regmap_set_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG, + AXI_DAC_CUSTOM_CTRL_STREAM_ENABLE); +} + +static int axi_dac_data_stream_disable(struct iio_backend *back) +{ + struct axi_dac_state *st = iio_backend_get_priv(back); + + return regmap_clear_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG, + AXI_DAC_CUSTOM_CTRL_STREAM_ENABLE); +} + +static int axi_dac_data_transfer_addr(struct iio_backend *back, u32 address) +{ + struct axi_dac_state *st = iio_backend_get_priv(back); + + if (address > FIELD_MAX(AXI_DAC_CUSTOM_CTRL_ADDRESS)) + return -EINVAL; + + /* + * Sample register address, when the DAC is configured, or stream + * start address when the FSM is in stream state. + */ + return regmap_update_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG, + AXI_DAC_CUSTOM_CTRL_ADDRESS, + FIELD_PREP(AXI_DAC_CUSTOM_CTRL_ADDRESS, + address)); +} + +static int axi_dac_data_format_set(struct iio_backend *back, unsigned int ch, + const struct iio_backend_data_fmt *data) +{ + struct axi_dac_state *st = iio_backend_get_priv(back); + + switch (data->type) { + case IIO_BACKEND_DATA_UNSIGNED: + return regmap_clear_bits(st->regmap, AXI_DAC_CNTRL_2_REG, + AXI_DAC_CNTRL_2_UNSIGNED_DATA); + default: + return -EINVAL; + } +} + +static int __axi_dac_bus_reg_write(struct iio_backend *back, u32 reg, + u32 val, size_t data_size) +{ + struct axi_dac_state *st = iio_backend_get_priv(back); + int ret; + u32 ival; + + /* + * Both AXI_DAC_CNTRL_2_REG and AXI_DAC_CUSTOM_WR_REG need to know + * the data size. So keeping data size control here only, + * since data size is mandatory for the current transfer. + * DDR state handled separately by specific backend calls, + * generally all raw register writes are SDR. + */ + if (data_size == sizeof(u16)) + ival = FIELD_PREP(AXI_DAC_CUSTOM_WR_DATA_16, val); + else + ival = FIELD_PREP(AXI_DAC_CUSTOM_WR_DATA_8, val); + + ret = regmap_write(st->regmap, AXI_DAC_CUSTOM_WR_REG, ival); + if (ret) + return ret; + + if (data_size == sizeof(u8)) + ret = regmap_set_bits(st->regmap, AXI_DAC_CNTRL_2_REG, + AXI_DAC_CNTRL_2_SYMB_8B); + else + ret = regmap_clear_bits(st->regmap, AXI_DAC_CNTRL_2_REG, + AXI_DAC_CNTRL_2_SYMB_8B); + if (ret) + return ret; + + ret = regmap_update_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG, + AXI_DAC_CUSTOM_CTRL_ADDRESS, + FIELD_PREP(AXI_DAC_CUSTOM_CTRL_ADDRESS, reg)); + if (ret) + return ret; + + ret = regmap_update_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG, + AXI_DAC_CUSTOM_CTRL_TRANSFER_DATA, + AXI_DAC_CUSTOM_CTRL_TRANSFER_DATA); + if (ret) + return ret; + + ret = regmap_read_poll_timeout(st->regmap, + AXI_DAC_UI_STATUS_REG, ival, + FIELD_GET(AXI_DAC_UI_STATUS_IF_BUSY, ival) == 0, + 10, 100 * KILO); + if (ret == -ETIMEDOUT) + dev_err(st->dev, "AXI read timeout\n"); + + /* Cleaning always AXI_DAC_CUSTOM_CTRL_TRANSFER_DATA */ + return regmap_clear_bits(st->regmap, AXI_DAC_CUSTOM_CTRL_REG, + AXI_DAC_CUSTOM_CTRL_TRANSFER_DATA); +} + +static int axi_dac_bus_reg_write(struct iio_backend *back, u32 reg, + u32 val, size_t data_size) +{ + struct axi_dac_state *st = iio_backend_get_priv(back); + + guard(mutex)(&st->lock); + return __axi_dac_bus_reg_write(back, reg, val, data_size); +} + +static int axi_dac_bus_reg_read(struct iio_backend *back, u32 reg, u32 *val, + size_t data_size) +{ + struct axi_dac_state *st = iio_backend_get_priv(back); + int ret; + + guard(mutex)(&st->lock); + + /* + * SPI, we write with read flag, then we read just at the AXI + * io address space to get data read. + */ + ret = __axi_dac_bus_reg_write(back, AXI_DAC_RD_ADDR(reg), 0, + data_size); + if (ret) + return ret; + + return regmap_read(st->regmap, AXI_DAC_CUSTOM_RD_REG, val); +} + static const struct iio_backend_ops axi_dac_generic_ops = { .enable = axi_dac_enable, .disable = axi_dac_disable, @@ -541,11 +724,30 @@ static const struct iio_backend_ops axi_dac_generic_ops = { .debugfs_reg_access = iio_backend_debugfs_ptr(axi_dac_reg_access), }; +static const struct iio_backend_ops axi_ad3552r_ops = { + .enable = axi_dac_enable, + .disable = axi_dac_disable, + .request_buffer = axi_dac_request_buffer, + .free_buffer = axi_dac_free_buffer, + .data_source_set = axi_dac_data_source_set, + .ddr_enable = axi_dac_ddr_enable, + .ddr_disable = axi_dac_ddr_disable, + .data_stream_enable = axi_dac_data_stream_enable, + .data_stream_disable = axi_dac_data_stream_disable, + .data_format_set = axi_dac_data_format_set, + .data_transfer_addr = axi_dac_data_transfer_addr, +}; + static const struct iio_backend_info axi_dac_generic = { .name = "axi-dac", .ops = &axi_dac_generic_ops, }; +static const struct iio_backend_info axi_ad3552r = { + .name = "axi-ad3552r", + .ops = &axi_ad3552r_ops, +}; + static const struct regmap_config axi_dac_regmap_config = { .val_bits = 32, .reg_bits = 32, @@ -555,7 +757,6 @@ static const struct regmap_config axi_dac_regmap_config = { static int axi_dac_probe(struct platform_device *pdev) { - const unsigned int *expected_ver; struct axi_dac_state *st; void __iomem *base; unsigned int ver; @@ -566,14 +767,29 @@ static int axi_dac_probe(struct platform_device *pdev) if (!st) return -ENOMEM; - expected_ver = device_get_match_data(&pdev->dev); - if (!expected_ver) + st->info = device_get_match_data(&pdev->dev); + if (!st->info) return -ENODEV; + clk = devm_clk_get_enabled(&pdev->dev, "s_axi_aclk"); + if (IS_ERR(clk)) { + /* Backward compat., old fdt versions without clock-names. */ + clk = devm_clk_get_enabled(&pdev->dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(clk), + "failed to get clock\n"); + } + + if (st->info->has_dac_clk) { + struct clk *dac_clk; - clk = devm_clk_get_enabled(&pdev->dev, NULL); - if (IS_ERR(clk)) - return dev_err_probe(&pdev->dev, PTR_ERR(clk), - "failed to get clock\n"); + dac_clk = devm_clk_get_enabled(&pdev->dev, "dac_clk"); + if (IS_ERR(dac_clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(dac_clk), + "failed to get dac_clk clock\n"); + + /* We only care about the streaming mode rate */ + st->dac_clk_rate = clk_get_rate(dac_clk) / 2; + } base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(base)) @@ -598,12 +814,13 @@ static int axi_dac_probe(struct platform_device *pdev) if (ret) return ret; - if (ADI_AXI_PCORE_VER_MAJOR(ver) != ADI_AXI_PCORE_VER_MAJOR(*expected_ver)) { + if (ADI_AXI_PCORE_VER_MAJOR(ver) != + ADI_AXI_PCORE_VER_MAJOR(st->info->version)) { dev_err(&pdev->dev, "Major version mismatch. Expected %d.%.2d.%c, Reported %d.%.2d.%c\n", - ADI_AXI_PCORE_VER_MAJOR(*expected_ver), - ADI_AXI_PCORE_VER_MINOR(*expected_ver), - ADI_AXI_PCORE_VER_PATCH(*expected_ver), + ADI_AXI_PCORE_VER_MAJOR(st->info->version), + ADI_AXI_PCORE_VER_MINOR(st->info->version), + ADI_AXI_PCORE_VER_PATCH(st->info->version), ADI_AXI_PCORE_VER_MAJOR(ver), ADI_AXI_PCORE_VER_MINOR(ver), ADI_AXI_PCORE_VER_PATCH(ver)); @@ -629,7 +846,8 @@ static int axi_dac_probe(struct platform_device *pdev) return ret; mutex_init(&st->lock); - ret = devm_iio_backend_register(&pdev->dev, &axi_dac_generic, st); + + ret = devm_iio_backend_register(&pdev->dev, st->info->backend_info, st); if (ret) return dev_err_probe(&pdev->dev, ret, "failed to register iio backend\n"); @@ -642,10 +860,20 @@ static int axi_dac_probe(struct platform_device *pdev) return 0; } -static unsigned int axi_dac_9_1_b_info = ADI_AXI_PCORE_VER(9, 1, 'b'); +static const struct axi_dac_info dac_generic = { + .version = ADI_AXI_PCORE_VER(9, 1, 'b'), + .backend_info = &axi_dac_generic, +}; + +static const struct axi_dac_info dac_ad3552r = { + .version = ADI_AXI_PCORE_VER(9, 1, 'b'), + .backend_info = &axi_ad3552r, + .has_dac_clk = true, +}; static const struct of_device_id axi_dac_of_match[] = { - { .compatible = "adi,axi-dac-9.1.b", .data = &axi_dac_9_1_b_info }, + { .compatible = "adi,axi-dac-9.1.b", .data = &dac_generic }, + { .compatible = "adi,axi-ad3552r", .data = &dac_ad3552r }, {} }; MODULE_DEVICE_TABLE(of, axi_dac_of_match); |