diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 73e248fb2ff1..346c44eff95e 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -203,4 +203,16 @@ config THINKPAD_ACPI_BAY If you are not sure, say Y here. +config ATMEL_SSC + tristate "Device driver for Atmel SSC peripheral" + depends on AVR32 || ARCH_AT91 + ---help--- + This option enables device driver support for Atmel Syncronized + Serial Communication peripheral (SSC). + + The SSC peripheral supports a wide variety of serial frame based + communications, i.e. I2S, SPI, etc. + + If unsure, say N. + endif # MISC_DEVICES diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index b5ce0e3dba86..a24c61475c2f 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_IBM_ASM) += ibmasm/ obj-$(CONFIG_HDPU_FEATURES) += hdpuftrs/ obj-$(CONFIG_MSI_LAPTOP) += msi-laptop.o obj-$(CONFIG_ASUS_LAPTOP) += asus-laptop.o +obj-$(CONFIG_ATMEL_SSC) += atmel-ssc.o obj-$(CONFIG_LKDTM) += lkdtm.o obj-$(CONFIG_TIFM_CORE) += tifm_core.o obj-$(CONFIG_TIFM_7XX1) += tifm_7xx1.o diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c new file mode 100644 index 000000000000..058ccac700d0 --- /dev/null +++ b/drivers/misc/atmel-ssc.c @@ -0,0 +1,174 @@ +/* + * Atmel SSC driver + * + * Copyright (C) 2007 Atmel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* Serialize access to ssc_list and user count */ +static DEFINE_SPINLOCK(user_lock); +static LIST_HEAD(ssc_list); + +struct ssc_device *ssc_request(unsigned int ssc_num) +{ + int ssc_valid = 0; + struct ssc_device *ssc; + + spin_lock(&user_lock); + list_for_each_entry(ssc, &ssc_list, list) { + if (ssc->pdev->id == ssc_num) { + ssc_valid = 1; + break; + } + } + + if (!ssc_valid) { + spin_unlock(&user_lock); + dev_dbg(&ssc->pdev->dev, "could not find requested device\n"); + return ERR_PTR(-ENODEV); + } + + if (ssc->user) { + spin_unlock(&user_lock); + dev_dbg(&ssc->pdev->dev, "module busy\n"); + return ERR_PTR(-EBUSY); + } + ssc->user++; + spin_unlock(&user_lock); + + clk_enable(ssc->clk); + + return ssc; +} +EXPORT_SYMBOL(ssc_request); + +void ssc_free(struct ssc_device *ssc) +{ + spin_lock(&user_lock); + if (ssc->user) { + ssc->user--; + clk_disable(ssc->clk); + } else { + dev_dbg(&ssc->pdev->dev, "device already free\n"); + } + spin_unlock(&user_lock); +} +EXPORT_SYMBOL(ssc_free); + +static int __init ssc_probe(struct platform_device *pdev) +{ + int retval = 0; + struct resource *regs; + struct ssc_device *ssc; + + ssc = kzalloc(sizeof(struct ssc_device), GFP_KERNEL); + if (!ssc) { + dev_dbg(&pdev->dev, "out of memory\n"); + retval = -ENOMEM; + goto out; + } + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!regs) { + dev_dbg(&pdev->dev, "no mmio resource defined\n"); + retval = -ENXIO; + goto out_free; + } + + ssc->clk = clk_get(&pdev->dev, "pclk"); + if (IS_ERR(ssc->clk)) { + dev_dbg(&pdev->dev, "no pclk clock defined\n"); + retval = -ENXIO; + goto out_free; + } + + ssc->pdev = pdev; + ssc->regs = ioremap(regs->start, regs->end - regs->start + 1); + if (!ssc->regs) { + dev_dbg(&pdev->dev, "ioremap failed\n"); + retval = -EINVAL; + goto out_clk; + } + + /* disable all interrupts */ + clk_enable(ssc->clk); + ssc_writel(ssc->regs, IDR, ~0UL); + ssc_readl(ssc->regs, SR); + clk_disable(ssc->clk); + + ssc->irq = platform_get_irq(pdev, 0); + if (!ssc->irq) { + dev_dbg(&pdev->dev, "could not get irq\n"); + retval = -ENXIO; + goto out_unmap; + } + + spin_lock(&user_lock); + list_add_tail(&ssc->list, &ssc_list); + spin_unlock(&user_lock); + + platform_set_drvdata(pdev, ssc); + + dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n", + ssc->regs, ssc->irq); + + goto out; + +out_unmap: + iounmap(ssc->regs); +out_clk: + clk_put(ssc->clk); +out_free: + kfree(ssc); +out: + return retval; +} + +static int __devexit ssc_remove(struct platform_device *pdev) +{ + struct ssc_device *ssc = platform_get_drvdata(pdev); + + spin_lock(&user_lock); + iounmap(ssc->regs); + clk_put(ssc->clk); + list_del(&ssc->list); + kfree(ssc); + spin_unlock(&user_lock); + + return 0; +} + +static struct platform_driver ssc_driver = { + .remove = __devexit_p(ssc_remove), + .driver = { + .name = "ssc", + }, +}; + +static int __init ssc_init(void) +{ + return platform_driver_probe(&ssc_driver, ssc_probe); +} +module_init(ssc_init); + +static void __exit ssc_exit(void) +{ + platform_driver_unregister(&ssc_driver); +} +module_exit(ssc_exit); + +MODULE_AUTHOR("Hans-Christian Egtvedt "); +MODULE_DESCRIPTION("SSC driver for Atmel AVR32 and AT91"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/atmel-ssc.h b/include/linux/atmel-ssc.h new file mode 100644 index 000000000000..06023393fba9 --- /dev/null +++ b/include/linux/atmel-ssc.h @@ -0,0 +1,312 @@ +#ifndef __INCLUDE_ATMEL_SSC_H +#define __INCLUDE_ATMEL_SSC_H + +#include +#include + +struct ssc_device { + struct list_head list; + void __iomem *regs; + struct platform_device *pdev; + struct clk *clk; + int user; + int irq; +}; + +struct ssc_device * __must_check ssc_request(unsigned int ssc_num); +void ssc_free(struct ssc_device *ssc); + +/* SSC register offsets */ + +/* SSC Control Register */ +#define SSC_CR 0x00000000 +#define SSC_CR_RXDIS_SIZE 1 +#define SSC_CR_RXDIS_OFFSET 1 +#define SSC_CR_RXEN_SIZE 1 +#define SSC_CR_RXEN_OFFSET 0 +#define SSC_CR_SWRST_SIZE 1 +#define SSC_CR_SWRST_OFFSET 15 +#define SSC_CR_TXDIS_SIZE 1 +#define SSC_CR_TXDIS_OFFSET 9 +#define SSC_CR_TXEN_SIZE 1 +#define SSC_CR_TXEN_OFFSET 8 + +/* SSC Clock Mode Register */ +#define SSC_CMR 0x00000004 +#define SSC_CMR_DIV_SIZE 12 +#define SSC_CMR_DIV_OFFSET 0 + +/* SSC Receive Clock Mode Register */ +#define SSC_RCMR 0x00000010 +#define SSC_RCMR_CKG_SIZE 2 +#define SSC_RCMR_CKG_OFFSET 6 +#define SSC_RCMR_CKI_SIZE 1 +#define SSC_RCMR_CKI_OFFSET 5 +#define SSC_RCMR_CKO_SIZE 3 +#define SSC_RCMR_CKO_OFFSET 2 +#define SSC_RCMR_CKS_SIZE 2 +#define SSC_RCMR_CKS_OFFSET 0 +#define SSC_RCMR_PERIOD_SIZE 8 +#define SSC_RCMR_PERIOD_OFFSET 24 +#define SSC_RCMR_START_SIZE 4 +#define SSC_RCMR_START_OFFSET 8 +#define SSC_RCMR_STOP_SIZE 1 +#define SSC_RCMR_STOP_OFFSET 12 +#define SSC_RCMR_STTDLY_SIZE 8 +#define SSC_RCMR_STTDLY_OFFSET 16 + +/* SSC Receive Frame Mode Register */ +#define SSC_RFMR 0x00000014 +#define SSC_RFMR_DATLEN_SIZE 5 +#define SSC_RFMR_DATLEN_OFFSET 0 +#define SSC_RFMR_DATNB_SIZE 4 +#define SSC_RFMR_DATNB_OFFSET 8 +#define SSC_RFMR_FSEDGE_SIZE 1 +#define SSC_RFMR_FSEDGE_OFFSET 24 +#define SSC_RFMR_FSLEN_SIZE 4 +#define SSC_RFMR_FSLEN_OFFSET 16 +#define SSC_RFMR_FSOS_SIZE 4 +#define SSC_RFMR_FSOS_OFFSET 20 +#define SSC_RFMR_LOOP_SIZE 1 +#define SSC_RFMR_LOOP_OFFSET 5 +#define SSC_RFMR_MSBF_SIZE 1 +#define SSC_RFMR_MSBF_OFFSET 7 + +/* SSC Transmit Clock Mode Register */ +#define SSC_TCMR 0x00000018 +#define SSC_TCMR_CKG_SIZE 2 +#define SSC_TCMR_CKG_OFFSET 6 +#define SSC_TCMR_CKI_SIZE 1 +#define SSC_TCMR_CKI_OFFSET 5 +#define SSC_TCMR_CKO_SIZE 3 +#define SSC_TCMR_CKO_OFFSET 2 +#define SSC_TCMR_CKS_SIZE 2 +#define SSC_TCMR_CKS_OFFSET 0 +#define SSC_TCMR_PERIOD_SIZE 8 +#define SSC_TCMR_PERIOD_OFFSET 24 +#define SSC_TCMR_START_SIZE 4 +#define SSC_TCMR_START_OFFSET 8 +#define SSC_TCMR_STTDLY_SIZE 8 +#define SSC_TCMR_STTDLY_OFFSET 16 + +/* SSC Transmit Frame Mode Register */ +#define SSC_TFMR 0x0000001c +#define SSC_TFMR_DATDEF_SIZE 1 +#define SSC_TFMR_DATDEF_OFFSET 5 +#define SSC_TFMR_DATLEN_SIZE 5 +#define SSC_TFMR_DATLEN_OFFSET 0 +#define SSC_TFMR_DATNB_SIZE 4 +#define SSC_TFMR_DATNB_OFFSET 8 +#define SSC_TFMR_FSDEN_SIZE 1 +#define SSC_TFMR_FSDEN_OFFSET 23 +#define SSC_TFMR_FSEDGE_SIZE 1 +#define SSC_TFMR_FSEDGE_OFFSET 24 +#define SSC_TFMR_FSLEN_SIZE 4 +#define SSC_TFMR_FSLEN_OFFSET 16 +#define SSC_TFMR_FSOS_SIZE 3 +#define SSC_TFMR_FSOS_OFFSET 20 +#define SSC_TFMR_MSBF_SIZE 1 +#define SSC_TFMR_MSBF_OFFSET 7 + +/* SSC Receive Hold Register */ +#define SSC_RHR 0x00000020 +#define SSC_RHR_RDAT_SIZE 32 +#define SSC_RHR_RDAT_OFFSET 0 + +/* SSC Transmit Hold Register */ +#define SSC_THR 0x00000024 +#define SSC_THR_TDAT_SIZE 32 +#define SSC_THR_TDAT_OFFSET 0 + +/* SSC Receive Sync. Holding Register */ +#define SSC_RSHR 0x00000030 +#define SSC_RSHR_RSDAT_SIZE 16 +#define SSC_RSHR_RSDAT_OFFSET 0 + +/* SSC Transmit Sync. Holding Register */ +#define SSC_TSHR 0x00000034 +#define SSC_TSHR_TSDAT_SIZE 16 +#define SSC_TSHR_RSDAT_OFFSET 0 + +/* SSC Receive Compare 0 Register */ +#define SSC_RC0R 0x00000038 +#define SSC_RC0R_CP0_SIZE 16 +#define SSC_RC0R_CP0_OFFSET 0 + +/* SSC Receive Compare 1 Register */ +#define SSC_RC1R 0x0000003c +#define SSC_RC1R_CP1_SIZE 16 +#define SSC_RC1R_CP1_OFFSET 0 + +/* SSC Status Register */ +#define SSC_SR 0x00000040 +#define SSC_SR_CP0_SIZE 1 +#define SSC_SR_CP0_OFFSET 8 +#define SSC_SR_CP1_SIZE 1 +#define SSC_SR_CP1_OFFSET 9 +#define SSC_SR_ENDRX_SIZE 1 +#define SSC_SR_ENDRX_OFFSET 6 +#define SSC_SR_ENDTX_SIZE 1 +#define SSC_SR_ENDTX_OFFSET 2 +#define SSC_SR_OVRUN_SIZE 1 +#define SSC_SR_OVRUN_OFFSET 5 +#define SSC_SR_RXBUFF_SIZE 1 +#define SSC_SR_RXBUFF_OFFSET 7 +#define SSC_SR_RXEN_SIZE 1 +#define SSC_SR_RXEN_OFFSET 17 +#define SSC_SR_RXRDY_SIZE 1 +#define SSC_SR_RXRDY_OFFSET 4 +#define SSC_SR_RXSYN_SIZE 1 +#define SSC_SR_RXSYN_OFFSET 11 +#define SSC_SR_TXBUFE_SIZE 1 +#define SSC_SR_TXBUFE_OFFSET 3 +#define SSC_SR_TXEMPTY_SIZE 1 +#define SSC_SR_TXEMPTY_OFFSET 1 +#define SSC_SR_TXEN_SIZE 1 +#define SSC_SR_TXEN_OFFSET 16 +#define SSC_SR_TXRDY_SIZE 1 +#define SSC_SR_TXRDY_OFFSET 0 +#define SSC_SR_TXSYN_SIZE 1 +#define SSC_SR_TXSYN_OFFSET 10 + +/* SSC Interrupt Enable Register */ +#define SSC_IER 0x00000044 +#define SSC_IER_CP0_SIZE 1 +#define SSC_IER_CP0_OFFSET 8 +#define SSC_IER_CP1_SIZE 1 +#define SSC_IER_CP1_OFFSET 9 +#define SSC_IER_ENDRX_SIZE 1 +#define SSC_IER_ENDRX_OFFSET 6 +#define SSC_IER_ENDTX_SIZE 1 +#define SSC_IER_ENDTX_OFFSET 2 +#define SSC_IER_OVRUN_SIZE 1 +#define SSC_IER_OVRUN_OFFSET 5 +#define SSC_IER_RXBUFF_SIZE 1 +#define SSC_IER_RXBUFF_OFFSET 7 +#define SSC_IER_RXRDY_SIZE 1 +#define SSC_IER_RXRDY_OFFSET 4 +#define SSC_IER_RXSYN_SIZE 1 +#define SSC_IER_RXSYN_OFFSET 11 +#define SSC_IER_TXBUFE_SIZE 1 +#define SSC_IER_TXBUFE_OFFSET 3 +#define SSC_IER_TXEMPTY_SIZE 1 +#define SSC_IER_TXEMPTY_OFFSET 1 +#define SSC_IER_TXRDY_SIZE 1 +#define SSC_IER_TXRDY_OFFSET 0 +#define SSC_IER_TXSYN_SIZE 1 +#define SSC_IER_TXSYN_OFFSET 10 + +/* SSC Interrupt Disable Register */ +#define SSC_IDR 0x00000048 +#define SSC_IDR_CP0_SIZE 1 +#define SSC_IDR_CP0_OFFSET 8 +#define SSC_IDR_CP1_SIZE 1 +#define SSC_IDR_CP1_OFFSET 9 +#define SSC_IDR_ENDRX_SIZE 1 +#define SSC_IDR_ENDRX_OFFSET 6 +#define SSC_IDR_ENDTX_SIZE 1 +#define SSC_IDR_ENDTX_OFFSET 2 +#define SSC_IDR_OVRUN_SIZE 1 +#define SSC_IDR_OVRUN_OFFSET 5 +#define SSC_IDR_RXBUFF_SIZE 1 +#define SSC_IDR_RXBUFF_OFFSET 7 +#define SSC_IDR_RXRDY_SIZE 1 +#define SSC_IDR_RXRDY_OFFSET 4 +#define SSC_IDR_RXSYN_SIZE 1 +#define SSC_IDR_RXSYN_OFFSET 11 +#define SSC_IDR_TXBUFE_SIZE 1 +#define SSC_IDR_TXBUFE_OFFSET 3 +#define SSC_IDR_TXEMPTY_SIZE 1 +#define SSC_IDR_TXEMPTY_OFFSET 1 +#define SSC_IDR_TXRDY_SIZE 1 +#define SSC_IDR_TXRDY_OFFSET 0 +#define SSC_IDR_TXSYN_SIZE 1 +#define SSC_IDR_TXSYN_OFFSET 10 + +/* SSC Interrupt Mask Register */ +#define SSC_IMR 0x0000004c +#define SSC_IMR_CP0_SIZE 1 +#define SSC_IMR_CP0_OFFSET 8 +#define SSC_IMR_CP1_SIZE 1 +#define SSC_IMR_CP1_OFFSET 9 +#define SSC_IMR_ENDRX_SIZE 1 +#define SSC_IMR_ENDRX_OFFSET 6 +#define SSC_IMR_ENDTX_SIZE 1 +#define SSC_IMR_ENDTX_OFFSET 2 +#define SSC_IMR_OVRUN_SIZE 1 +#define SSC_IMR_OVRUN_OFFSET 5 +#define SSC_IMR_RXBUFF_SIZE 1 +#define SSC_IMR_RXBUFF_OFFSET 7 +#define SSC_IMR_RXRDY_SIZE 1 +#define SSC_IMR_RXRDY_OFFSET 4 +#define SSC_IMR_RXSYN_SIZE 1 +#define SSC_IMR_RXSYN_OFFSET 11 +#define SSC_IMR_TXBUFE_SIZE 1 +#define SSC_IMR_TXBUFE_OFFSET 3 +#define SSC_IMR_TXEMPTY_SIZE 1 +#define SSC_IMR_TXEMPTY_OFFSET 1 +#define SSC_IMR_TXRDY_SIZE 1 +#define SSC_IMR_TXRDY_OFFSET 0 +#define SSC_IMR_TXSYN_SIZE 1 +#define SSC_IMR_TXSYN_OFFSET 10 + +/* SSC PDC Receive Pointer Register */ +#define SSC_PDC_RPR 0x00000100 + +/* SSC PDC Receive Counter Register */ +#define SSC_PDC_RCR 0x00000104 + +/* SSC PDC Transmit Pointer Register */ +#define SSC_PDC_TPR 0x00000108 + +/* SSC PDC Receive Next Pointer Register */ +#define SSC_PDC_RNPR 0x00000110 + +/* SSC PDC Receive Next Counter Register */ +#define SSC_PDC_RNCR 0x00000114 + +/* SSC PDC Transmit Counter Register */ +#define SSC_PDC_TCR 0x0000010c + +/* SSC PDC Transmit Next Pointer Register */ +#define SSC_PDC_TNPR 0x00000118 + +/* SSC PDC Transmit Next Counter Register */ +#define SSC_PDC_TNCR 0x0000011c + +/* SSC PDC Transfer Control Register */ +#define SSC_PDC_PTCR 0x00000120 +#define SSC_PDC_PTCR_RXTDIS_SIZE 1 +#define SSC_PDC_PTCR_RXTDIS_OFFSET 1 +#define SSC_PDC_PTCR_RXTEN_SIZE 1 +#define SSC_PDC_PTCR_RXTEN_OFFSET 0 +#define SSC_PDC_PTCR_TXTDIS_SIZE 1 +#define SSC_PDC_PTCR_TXTDIS_OFFSET 9 +#define SSC_PDC_PTCR_TXTEN_SIZE 1 +#define SSC_PDC_PTCR_TXTEN_OFFSET 8 + +/* SSC PDC Transfer Status Register */ +#define SSC_PDC_PTSR 0x00000124 +#define SSC_PDC_PTSR_RXTEN_SIZE 1 +#define SSC_PDC_PTSR_RXTEN_OFFSET 0 +#define SSC_PDC_PTSR_TXTEN_SIZE 1 +#define SSC_PDC_PTSR_TXTEN_OFFSET 8 + +/* Bit manipulation macros */ +#define SSC_BIT(name) \ + (1 << SSC_##name##_OFFSET) +#define SSC_BF(name, value) \ + (((value) & ((1 << SSC_##name##_SIZE) - 1)) \ + << SSC_##name##_OFFSET) +#define SSC_BFEXT(name, value) \ + (((value) >> SSC_##name##_OFFSET) \ + & ((1 << SSC_##name##_SIZE) - 1)) +#define SSC_BFINS(name, value, old) \ + (((old) & ~(((1 << SSC_##name##_SIZE) - 1) \ + << SSC_##name##_OFFSET)) | SSC_BF(name, value)) + +/* Register access macros */ +#define ssc_readl(base, reg) __raw_readl(base + SSC_##reg) +#define ssc_writel(base, reg, value) __raw_writel((value), base + SSC_##reg) + +#endif /* __INCLUDE_ATMEL_SSC_H */