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[ARM] 4754/1: [AT91] SSC library support
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Core support of the Atmel SSC library for all Atmel AT91 processors.

Based on David Brownell's initial patch for the AT91RM9200.

Signed-off-by: Andrew Victor <linux@maxim.org.za>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Andrew Victor authored and Russell King committed Jan 26, 2008
1 parent c6686ff commit bfbc326
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173 changes: 173 additions & 0 deletions arch/arm/mach-at91/at91rm9200_devices.c
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Original file line number Diff line number Diff line change
Expand Up @@ -635,6 +635,179 @@ void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}
#endif


/* --------------------------------------------------------------------
* SSC -- Synchronous Serial Controller
* -------------------------------------------------------------------- */

#if defined(CONFIG_ATMEL_SSC) || defined(CONFIG_ATMEL_SSC_MODULE)
static u64 ssc0_dmamask = DMA_BIT_MASK(32);

static struct resource ssc0_resources[] = {
[0] = {
.start = AT91RM9200_BASE_SSC0,
.end = AT91RM9200_BASE_SSC0 + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = AT91RM9200_ID_SSC0,
.end = AT91RM9200_ID_SSC0,
.flags = IORESOURCE_IRQ,
},
};

static struct platform_device at91rm9200_ssc0_device = {
.name = "ssc",
.id = 0,
.dev = {
.dma_mask = &ssc0_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
},
.resource = ssc0_resources,
.num_resources = ARRAY_SIZE(ssc0_resources),
};

static inline void configure_ssc0_pins(unsigned pins)
{
if (pins & ATMEL_SSC_TF)
at91_set_A_periph(AT91_PIN_PB0, 1);
if (pins & ATMEL_SSC_TK)
at91_set_A_periph(AT91_PIN_PB1, 1);
if (pins & ATMEL_SSC_TD)
at91_set_A_periph(AT91_PIN_PB2, 1);
if (pins & ATMEL_SSC_RD)
at91_set_A_periph(AT91_PIN_PB3, 1);
if (pins & ATMEL_SSC_RK)
at91_set_A_periph(AT91_PIN_PB4, 1);
if (pins & ATMEL_SSC_RF)
at91_set_A_periph(AT91_PIN_PB5, 1);
}

static u64 ssc1_dmamask = DMA_BIT_MASK(32);

static struct resource ssc1_resources[] = {
[0] = {
.start = AT91RM9200_BASE_SSC1,
.end = AT91RM9200_BASE_SSC1 + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = AT91RM9200_ID_SSC1,
.end = AT91RM9200_ID_SSC1,
.flags = IORESOURCE_IRQ,
},
};

static struct platform_device at91rm9200_ssc1_device = {
.name = "ssc",
.id = 1,
.dev = {
.dma_mask = &ssc1_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
},
.resource = ssc1_resources,
.num_resources = ARRAY_SIZE(ssc1_resources),
};

static inline void configure_ssc1_pins(unsigned pins)
{
if (pins & ATMEL_SSC_TF)
at91_set_A_periph(AT91_PIN_PB6, 1);
if (pins & ATMEL_SSC_TK)
at91_set_A_periph(AT91_PIN_PB7, 1);
if (pins & ATMEL_SSC_TD)
at91_set_A_periph(AT91_PIN_PB8, 1);
if (pins & ATMEL_SSC_RD)
at91_set_A_periph(AT91_PIN_PB9, 1);
if (pins & ATMEL_SSC_RK)
at91_set_A_periph(AT91_PIN_PB10, 1);
if (pins & ATMEL_SSC_RF)
at91_set_A_periph(AT91_PIN_PB11, 1);
}

static u64 ssc2_dmamask = DMA_BIT_MASK(32);

static struct resource ssc2_resources[] = {
[0] = {
.start = AT91RM9200_BASE_SSC2,
.end = AT91RM9200_BASE_SSC2 + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = AT91RM9200_ID_SSC2,
.end = AT91RM9200_ID_SSC2,
.flags = IORESOURCE_IRQ,
},
};

static struct platform_device at91rm9200_ssc2_device = {
.name = "ssc",
.id = 2,
.dev = {
.dma_mask = &ssc2_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
},
.resource = ssc2_resources,
.num_resources = ARRAY_SIZE(ssc2_resources),
};

static inline void configure_ssc2_pins(unsigned pins)
{
if (pins & ATMEL_SSC_TF)
at91_set_A_periph(AT91_PIN_PB12, 1);
if (pins & ATMEL_SSC_TK)
at91_set_A_periph(AT91_PIN_PB13, 1);
if (pins & ATMEL_SSC_TD)
at91_set_A_periph(AT91_PIN_PB14, 1);
if (pins & ATMEL_SSC_RD)
at91_set_A_periph(AT91_PIN_PB15, 1);
if (pins & ATMEL_SSC_RK)
at91_set_A_periph(AT91_PIN_PB16, 1);
if (pins & ATMEL_SSC_RF)
at91_set_A_periph(AT91_PIN_PB17, 1);
}

/*
* SSC controllers are accessed through library code, instead of any
* kind of all-singing/all-dancing driver. For example one could be
* used by a particular I2S audio codec's driver, while another one
* on the same system might be used by a custom data capture driver.
*/
void __init at91_add_device_ssc(unsigned id, unsigned pins)
{
struct platform_device *pdev;

/*
* NOTE: caller is responsible for passing information matching
* "pins" to whatever will be using each particular controller.
*/
switch (id) {
case AT91RM9200_ID_SSC0:
pdev = &at91rm9200_ssc0_device;
configure_ssc0_pins(pins);
at91_clock_associate("ssc0_clk", &pdev->dev, "ssc");
break;
case AT91RM9200_ID_SSC1:
pdev = &at91rm9200_ssc1_device;
configure_ssc1_pins(pins);
at91_clock_associate("ssc1_clk", &pdev->dev, "ssc");
break;
case AT91RM9200_ID_SSC2:
pdev = &at91rm9200_ssc2_device;
configure_ssc2_pins(pins);
at91_clock_associate("ssc2_clk", &pdev->dev, "ssc");
break;
default:
return;
}

platform_device_register(pdev);
}

#else
void __init at91_add_device_ssc(unsigned id, unsigned pins) {}
#endif


/* --------------------------------------------------------------------
* UART
* -------------------------------------------------------------------- */
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79 changes: 79 additions & 0 deletions arch/arm/mach-at91/at91sam9260_devices.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -606,6 +606,85 @@ void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}
#endif


/* --------------------------------------------------------------------
* SSC -- Synchronous Serial Controller
* -------------------------------------------------------------------- */

#if defined(CONFIG_ATMEL_SSC) || defined(CONFIG_ATMEL_SSC_MODULE)
static u64 ssc_dmamask = DMA_BIT_MASK(32);

static struct resource ssc_resources[] = {
[0] = {
.start = AT91SAM9260_BASE_SSC,
.end = AT91SAM9260_BASE_SSC + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = AT91SAM9260_ID_SSC,
.end = AT91SAM9260_ID_SSC,
.flags = IORESOURCE_IRQ,
},
};

static struct platform_device at91sam9260_ssc_device = {
.name = "ssc",
.id = 0,
.dev = {
.dma_mask = &ssc_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
},
.resource = ssc_resources,
.num_resources = ARRAY_SIZE(ssc_resources),
};

static inline void configure_ssc_pins(unsigned pins)
{
if (pins & ATMEL_SSC_TF)
at91_set_A_periph(AT91_PIN_PB17, 1);
if (pins & ATMEL_SSC_TK)
at91_set_A_periph(AT91_PIN_PB16, 1);
if (pins & ATMEL_SSC_TD)
at91_set_A_periph(AT91_PIN_PB18, 1);
if (pins & ATMEL_SSC_RD)
at91_set_A_periph(AT91_PIN_PB19, 1);
if (pins & ATMEL_SSC_RK)
at91_set_A_periph(AT91_PIN_PB20, 1);
if (pins & ATMEL_SSC_RF)
at91_set_A_periph(AT91_PIN_PB21, 1);
}

/*
* SSC controllers are accessed through library code, instead of any
* kind of all-singing/all-dancing driver. For example one could be
* used by a particular I2S audio codec's driver, while another one
* on the same system might be used by a custom data capture driver.
*/
void __init at91_add_device_ssc(unsigned id, unsigned pins)
{
struct platform_device *pdev;

/*
* NOTE: caller is responsible for passing information matching
* "pins" to whatever will be using each particular controller.
*/
switch (id) {
case AT91SAM9260_ID_SSC:
pdev = &at91sam9260_ssc_device;
configure_ssc_pins(pins);
at91_clock_associate("ssc_clk", &pdev->dev, "pclk");
break;
default:
return;
}

platform_device_register(pdev);
}

#else
void __init at91_add_device_ssc(unsigned id, unsigned pins) {}
#endif


/* --------------------------------------------------------------------
* UART
* -------------------------------------------------------------------- */
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