diff options
Diffstat (limited to 'drivers/dma/imx-sdma.c')
| -rw-r--r-- | drivers/dma/imx-sdma.c | 94 |
1 files changed, 71 insertions, 23 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 1ea47db2ff0..1eb60ded2f0 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -32,6 +32,8 @@ #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/dmaengine.h> +#include <linux/of.h> +#include <linux/of_device.h> #include <asm/irq.h> #include <mach/sdma.h> @@ -65,8 +67,8 @@ #define SDMA_ONCE_RTB 0x060 #define SDMA_XTRIG_CONF1 0x070 #define SDMA_XTRIG_CONF2 0x074 -#define SDMA_CHNENBL0_V2 0x200 -#define SDMA_CHNENBL0_V1 0x080 +#define SDMA_CHNENBL0_IMX35 0x200 +#define SDMA_CHNENBL0_IMX31 0x080 #define SDMA_CHNPRI_0 0x100 /* @@ -299,13 +301,18 @@ struct sdma_firmware_header { u32 ram_code_size; }; +enum sdma_devtype { + IMX31_SDMA, /* runs on i.mx31 */ + IMX35_SDMA, /* runs on i.mx35 and later */ +}; + struct sdma_engine { struct device *dev; struct device_dma_parameters dma_parms; struct sdma_channel channel[MAX_DMA_CHANNELS]; struct sdma_channel_control *channel_control; void __iomem *regs; - unsigned int version; + enum sdma_devtype devtype; unsigned int num_events; struct sdma_context_data *context; dma_addr_t context_phys; @@ -314,6 +321,26 @@ struct sdma_engine { struct sdma_script_start_addrs *script_addrs; }; +static struct platform_device_id sdma_devtypes[] = { + { + .name = "imx31-sdma", + .driver_data = IMX31_SDMA, + }, { + .name = "imx35-sdma", + .driver_data = IMX35_SDMA, + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(platform, sdma_devtypes); + +static const struct of_device_id sdma_dt_ids[] = { + { .compatible = "fsl,imx31-sdma", .data = &sdma_devtypes[IMX31_SDMA], }, + { .compatible = "fsl,imx35-sdma", .data = &sdma_devtypes[IMX35_SDMA], }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, sdma_dt_ids); + #define SDMA_H_CONFIG_DSPDMA (1 << 12) /* indicates if the DSPDMA is used */ #define SDMA_H_CONFIG_RTD_PINS (1 << 11) /* indicates if Real-Time Debug pins are enabled */ #define SDMA_H_CONFIG_ACR (1 << 4) /* indicates if AHB freq /core freq = 2 or 1 */ @@ -321,8 +348,8 @@ struct sdma_engine { static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event) { - u32 chnenbl0 = (sdma->version == 2 ? SDMA_CHNENBL0_V2 : SDMA_CHNENBL0_V1); - + u32 chnenbl0 = (sdma->devtype == IMX31_SDMA ? SDMA_CHNENBL0_IMX31 : + SDMA_CHNENBL0_IMX35); return chnenbl0 + event * 4; } @@ -1108,22 +1135,14 @@ static int __init sdma_get_firmware(struct sdma_engine *sdma, const char *fw_name) { const struct firmware *fw; - char *fwname; const struct sdma_firmware_header *header; int ret; const struct sdma_script_start_addrs *addr; unsigned short *ram_code; - fwname = kasprintf(GFP_KERNEL, "%s", fw_name); - if (!fwname) - return -ENOMEM; - - ret = request_firmware(&fw, fwname, sdma->dev); - if (ret) { - kfree(fwname); + ret = request_firmware(&fw, fw_name, sdma->dev); + if (ret) return ret; - } - kfree(fwname); if (fw->size < sizeof(*header)) goto err_firmware; @@ -1162,15 +1181,16 @@ static int __init sdma_init(struct sdma_engine *sdma) int i, ret; dma_addr_t ccb_phys; - switch (sdma->version) { - case 1: + switch (sdma->devtype) { + case IMX31_SDMA: sdma->num_events = 32; break; - case 2: + case IMX35_SDMA: sdma->num_events = 48; break; default: - dev_err(sdma->dev, "Unknown version %d. aborting\n", sdma->version); + dev_err(sdma->dev, "Unknown sdma type %d. aborting\n", + sdma->devtype); return -ENODEV; } @@ -1239,6 +1259,10 @@ err_dma_alloc: static int __init sdma_probe(struct platform_device *pdev) { + const struct of_device_id *of_id = + of_match_device(sdma_dt_ids, &pdev->dev); + struct device_node *np = pdev->dev.of_node; + const char *fw_name; int ret; int irq; struct resource *iores; @@ -1254,7 +1278,7 @@ static int __init sdma_probe(struct platform_device *pdev) iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq = platform_get_irq(pdev, 0); - if (!iores || irq < 0 || !pdata) { + if (!iores || irq < 0) { ret = -EINVAL; goto err_irq; } @@ -1284,7 +1308,9 @@ static int __init sdma_probe(struct platform_device *pdev) if (!sdma->script_addrs) goto err_alloc; - sdma->version = pdata->sdma_version; + if (of_id) + pdev->id_entry = of_id->data; + sdma->devtype = pdev->id_entry->driver_data; dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); @@ -1314,10 +1340,30 @@ static int __init sdma_probe(struct platform_device *pdev) if (ret) goto err_init; - if (pdata->script_addrs) + if (pdata && pdata->script_addrs) sdma_add_scripts(sdma, pdata->script_addrs); - sdma_get_firmware(sdma, pdata->fw_name); + if (pdata) { + sdma_get_firmware(sdma, pdata->fw_name); + } else { + /* + * Because that device tree does not encode ROM script address, + * the RAM script in firmware is mandatory for device tree + * probe, otherwise it fails. + */ + ret = of_property_read_string(np, "fsl,sdma-ram-script-name", + &fw_name); + if (ret) { + dev_err(&pdev->dev, "failed to get firmware name\n"); + goto err_init; + } + + ret = sdma_get_firmware(sdma, fw_name); + if (ret) { + dev_err(&pdev->dev, "failed to get firmware\n"); + goto err_init; + } + } sdma->dma_device.dev = &pdev->dev; @@ -1365,7 +1411,9 @@ static int __exit sdma_remove(struct platform_device *pdev) static struct platform_driver sdma_driver = { .driver = { .name = "imx-sdma", + .of_match_table = sdma_dt_ids, }, + .id_table = sdma_devtypes, .remove = __exit_p(sdma_remove), }; |