diff options
| -rw-r--r-- | drivers/spi/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/spi/Makefile | 1 | ||||
| -rw-r--r-- | drivers/spi/pxa2xx_spi.c | 1 | ||||
| -rw-r--r-- | drivers/spi/pxa2xx_spi_pci.c | 201 | ||||
| -rw-r--r-- | include/linux/spi/pxa2xx_spi.h | 105 |
5 files changed, 314 insertions, 7 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 78f9fd0..5377590 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -267,12 +267,15 @@ config SPI_PPC4xx config SPI_PXA2XX tristate "PXA2xx SSP SPI master" - depends on ARCH_PXA && EXPERIMENTAL - select PXA_SSP + depends on (ARCH_PXA || (X86_32 && PCI)) && EXPERIMENTAL + select PXA_SSP if ARCH_PXA help - This enables using a PXA2xx SSP port as a SPI master controller. - The driver can be configured to use any SSP port and additional - documentation can be found a Documentation/spi/pxa2xx. + This enables using a PXA2xx or Sodaville SSP port as a SPI master + controller. The driver can be configured to use any SSP port and + additional documentation can be found a Documentation/spi/pxa2xx. + +config SPI_PXA2XX_PCI + def_bool SPI_PXA2XX && X86_32 && PCI config SPI_S3C24XX tristate "Samsung S3C24XX series SPI" diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 8bc1a5a..bdc4c40 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_SPI_GPIO) += spi_gpio.o obj-$(CONFIG_SPI_IMX) += spi_imx.o obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o obj-$(CONFIG_SPI_PXA2XX) += pxa2xx_spi.o +obj-$(CONFIG_SPI_PXA2XX_PCI) += pxa2xx_spi_pci.o obj-$(CONFIG_SPI_OMAP_UWIRE) += omap_uwire.o obj-$(CONFIG_SPI_OMAP24XX) += omap2_mcspi.o obj-$(CONFIG_SPI_OMAP_100K) += omap_spi_100k.o diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c index 98d9c8b..ed212c2 100644 --- a/drivers/spi/pxa2xx_spi.c +++ b/drivers/spi/pxa2xx_spi.c @@ -28,7 +28,6 @@ #include <linux/spi/spi.h> #include <linux/workqueue.h> #include <linux/delay.h> -#include <linux/clk.h> #include <linux/gpio.h> #include <linux/slab.h> diff --git a/drivers/spi/pxa2xx_spi_pci.c b/drivers/spi/pxa2xx_spi_pci.c new file mode 100644 index 0000000..351d8a3 --- /dev/null +++ b/drivers/spi/pxa2xx_spi_pci.c @@ -0,0 +1,201 @@ +/* + * CE4100's SPI device is more or less the same one as found on PXA + * + */ +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/of_device.h> +#include <linux/spi/pxa2xx_spi.h> + +struct awesome_struct { + struct ssp_device ssp; + struct platform_device spi_pdev; + struct pxa2xx_spi_master spi_pdata; +}; + +static DEFINE_MUTEX(ssp_lock); +static LIST_HEAD(ssp_list); + +struct ssp_device *pxa_ssp_request(int port, const char *label) +{ + struct ssp_device *ssp = NULL; + + mutex_lock(&ssp_lock); + + list_for_each_entry(ssp, &ssp_list, node) { + if (ssp->port_id == port && ssp->use_count == 0) { + ssp->use_count++; + ssp->label = label; + break; + } + } + + mutex_unlock(&ssp_lock); + + if (&ssp->node == &ssp_list) + return NULL; + + return ssp; +} +EXPORT_SYMBOL_GPL(pxa_ssp_request); + +void pxa_ssp_free(struct ssp_device *ssp) +{ + mutex_lock(&ssp_lock); + if (ssp->use_count) { + ssp->use_count--; + ssp->label = NULL; + } else + dev_err(&ssp->pdev->dev, "device already free\n"); + mutex_unlock(&ssp_lock); +} +EXPORT_SYMBOL_GPL(pxa_ssp_free); + +static void plat_dev_release(struct device *dev) +{ + struct awesome_struct *as = container_of(dev, + struct awesome_struct, spi_pdev.dev); + + of_device_node_put(&as->spi_pdev.dev); +} + +static int __devinit ce4100_spi_probe(struct pci_dev *dev, + const struct pci_device_id *ent) +{ + int ret; + resource_size_t phys_beg; + resource_size_t phys_len; + struct awesome_struct *spi_info; + struct platform_device *pdev; + struct pxa2xx_spi_master *spi_pdata; + struct ssp_device *ssp; + + ret = pci_enable_device(dev); + if (ret) + return ret; + + phys_beg = pci_resource_start(dev, 0); + phys_len = pci_resource_len(dev, 0); + + if (!request_mem_region(phys_beg, phys_len, + "CE4100 SPI")) { + dev_err(&dev->dev, "Can't request register space.\n"); + ret = -EBUSY; + return ret; + } + + spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL); + if (!spi_info) { + ret = -ENOMEM; + goto err_kz; + } + ssp = &spi_info->ssp; + pdev = &spi_info->spi_pdev; + spi_pdata = &spi_info->spi_pdata; + + pdev->name = "pxa2xx-spi"; + pdev->id = dev->devfn; + pdev->dev.parent = &dev->dev; + pdev->dev.platform_data = &spi_info->spi_pdata; + +#ifdef CONFIG_OF + pdev->dev.of_node = dev->dev.of_node; +#endif + pdev->dev.release = plat_dev_release; + + spi_pdata->num_chipselect = dev->devfn; + + ssp->phys_base = pci_resource_start(dev, 0); + ssp->mmio_base = ioremap(phys_beg, phys_len); + if (!ssp->mmio_base) { + dev_err(&pdev->dev, "failed to ioremap() registers\n"); + ret = -EIO; + goto err_remap; + } + ssp->irq = dev->irq; + ssp->port_id = pdev->id; + ssp->type = PXA25x_SSP; + + mutex_lock(&ssp_lock); + list_add(&ssp->node, &ssp_list); + mutex_unlock(&ssp_lock); + + pci_set_drvdata(dev, spi_info); + + ret = platform_device_register(pdev); + if (ret) + goto err_dev_add; + + return ret; + +err_dev_add: + pci_set_drvdata(dev, NULL); + mutex_lock(&ssp_lock); + list_del(&ssp->node); + mutex_unlock(&ssp_lock); + iounmap(ssp->mmio_base); + +err_remap: + kfree(spi_info); + +err_kz: + release_mem_region(phys_beg, phys_len); + + return ret; +} + +static void __devexit ce4100_spi_remove(struct pci_dev *dev) +{ + struct awesome_struct *spi_info; + struct platform_device *pdev; + struct ssp_device *ssp; + + spi_info = pci_get_drvdata(dev); + + ssp = &spi_info->ssp; + pdev = &spi_info->spi_pdev; + + platform_device_unregister(pdev); + + iounmap(ssp->mmio_base); + release_mem_region(pci_resource_start(dev, 0), + pci_resource_len(dev, 0)); + + mutex_lock(&ssp_lock); + list_del(&ssp->node); + mutex_unlock(&ssp_lock); + + pci_set_drvdata(dev, NULL); + pci_disable_device(dev); + kfree(spi_info); +} + +static struct pci_device_id ce4100_spi_devices[] __devinitdata = { + + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) }, + { }, +}; +MODULE_DEVICE_TABLE(pci, ce4100_spi_devices); + +static struct pci_driver ce4100_spi_driver = { + .name = "ce4100_spi", + .id_table = ce4100_spi_devices, + .probe = ce4100_spi_probe, + .remove = __devexit_p(ce4100_spi_remove), +}; + +static int __init ce4100_spi_init(void) +{ + return pci_register_driver(&ce4100_spi_driver); +} +module_init(ce4100_spi_init); + +static void __exit ce4100_spi_exit(void) +{ + pci_unregister_driver(&ce4100_spi_driver); +} +module_exit(ce4100_spi_exit); + +MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>"); diff --git a/include/linux/spi/pxa2xx_spi.h b/include/linux/spi/pxa2xx_spi.h index 471ed68..d3e1075 100644 --- a/include/linux/spi/pxa2xx_spi.h +++ b/include/linux/spi/pxa2xx_spi.h @@ -19,7 +19,6 @@ #define __linux_pxa2xx_spi_h #include <linux/pxa2xx_ssp.h> -#include <mach/dma.h> #define PXA2XX_CS_ASSERT (0x01) #define PXA2XX_CS_DEASSERT (0x02) @@ -44,6 +43,110 @@ struct pxa2xx_spi_chip { void (*cs_control)(u32 command); }; +#ifdef CONFIG_ARCH_PXA + +#include <linux/clk.h> +#include <mach/dma.h> + extern void pxa2xx_set_spi_info(unsigned id, struct pxa2xx_spi_master *info); +#else +/* + * This is the implemtation for CE4100 on x86. ARM defines them in mach/ or + * plat/ include path. + * The CE4100 does not provide DMA support. This bits are here to let the driver + * compile and will never be used. Maybe we get DMA support at a later point in + * time. + */ + +#define DCSR(n) (n) +#define DSADR(n) (n) +#define DTADR(n) (n) +#define DCMD(n) (n) +#define DRCMR(n) (n) + +#define DCSR_RUN (1 << 31) /* Run Bit */ +#define DCSR_NODESC (1 << 30) /* No-Descriptor Fetch */ +#define DCSR_STOPIRQEN (1 << 29) /* Stop Interrupt Enable */ +#define DCSR_REQPEND (1 << 8) /* Request Pending (read-only) */ +#define DCSR_STOPSTATE (1 << 3) /* Stop State (read-only) */ +#define DCSR_ENDINTR (1 << 2) /* End Interrupt */ +#define DCSR_STARTINTR (1 << 1) /* Start Interrupt */ +#define DCSR_BUSERR (1 << 0) /* Bus Error Interrupt */ + +#define DCSR_EORIRQEN (1 << 28) /* End of Receive Interrupt Enable */ +#define DCSR_EORJMPEN (1 << 27) /* Jump to next descriptor on EOR */ +#define DCSR_EORSTOPEN (1 << 26) /* STOP on an EOR */ +#define DCSR_SETCMPST (1 << 25) /* Set Descriptor Compare Status */ +#define DCSR_CLRCMPST (1 << 24) /* Clear Descriptor Compare Status */ +#define DCSR_CMPST (1 << 10) /* The Descriptor Compare Status */ +#define DCSR_EORINTR (1 << 9) /* The end of Receive */ + +#define DRCMR_MAPVLD (1 << 7) /* Map Valid */ +#define DRCMR_CHLNUM 0x1f /* mask for Channel Number */ + +#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor */ +#define DDADR_STOP (1 << 0) /* Stop */ + +#define DCMD_INCSRCADDR (1 << 31) /* Source Address Increment Setting. */ +#define DCMD_INCTRGADDR (1 << 30) /* Target Address Increment Setting. */ +#define DCMD_FLOWSRC (1 << 29) /* Flow Control by the source. */ +#define DCMD_FLOWTRG (1 << 28) /* Flow Control by the target. */ +#define DCMD_STARTIRQEN (1 << 22) /* Start Interrupt Enable */ +#define DCMD_ENDIRQEN (1 << 21) /* End Interrupt Enable */ +#define DCMD_ENDIAN (1 << 18) /* Device Endian-ness. */ +#define DCMD_BURST8 (1 << 16) /* 8 byte burst */ +#define DCMD_BURST16 (2 << 16) /* 16 byte burst */ +#define DCMD_BURST32 (3 << 16) /* 32 byte burst */ +#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */ +#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */ +#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */ +#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */ + +/* + * Descriptor structure for PXA's DMA engine + * Note: this structure must always be aligned to a 16-byte boundary. + */ + +typedef enum { + DMA_PRIO_HIGH = 0, + DMA_PRIO_MEDIUM = 1, + DMA_PRIO_LOW = 2 +} pxa_dma_prio; + +/* + * DMA registration + */ + +static inline int pxa_request_dma(char *name, + pxa_dma_prio prio, + void (*irq_handler)(int, void *), + void *data) +{ + return -ENODEV; +} + +static inline void pxa_free_dma(int dma_ch) +{ +} + +/* + * The CE4100 does not have the clk framework implemented and SPI clock can + * not be switched on/off or the divider changed. + */ +static inline void clk_disable(struct clk *clk) +{ +} + +static inline int clk_enable(struct clk *clk) +{ + return 0; +} + +static inline unsigned long clk_get_rate(struct clk *clk) +{ + return 3686400; +} + +#endif #endif |