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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>
This commit is contained in:
Andrew Victor
2008-01-23 09:18:06 +01:00
committed by Russell King
parent c6686ff9df
commit bfbc32663d
6 changed files with 700 additions and 0 deletions
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129
arch/arm/mach-at91/at91sam9rl_devices.c
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@@ -471,6 +471,135 @@ 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 = AT91SAM9RL_BASE_SSC0,
.end = AT91SAM9RL_BASE_SSC0 + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = AT91SAM9RL_ID_SSC0,
.end = AT91SAM9RL_ID_SSC0,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device at91sam9rl_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_PC0, 1);
if (pins & ATMEL_SSC_TK)
at91_set_A_periph(AT91_PIN_PC1, 1);
if (pins & ATMEL_SSC_TD)
at91_set_A_periph(AT91_PIN_PA15, 1);
if (pins & ATMEL_SSC_RD)
at91_set_A_periph(AT91_PIN_PA16, 1);
if (pins & ATMEL_SSC_RK)
at91_set_B_periph(AT91_PIN_PA10, 1);
if (pins & ATMEL_SSC_RF)
at91_set_B_periph(AT91_PIN_PA22, 1);
}
static u64 ssc1_dmamask = DMA_BIT_MASK(32);
static struct resource ssc1_resources[] = {
[0] = {
.start = AT91SAM9RL_BASE_SSC1,
.end = AT91SAM9RL_BASE_SSC1 + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = AT91SAM9RL_ID_SSC1,
.end = AT91SAM9RL_ID_SSC1,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device at91sam9rl_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_B_periph(AT91_PIN_PA29, 1);
if (pins & ATMEL_SSC_TK)
at91_set_B_periph(AT91_PIN_PA30, 1);
if (pins & ATMEL_SSC_TD)
at91_set_B_periph(AT91_PIN_PA13, 1);
if (pins & ATMEL_SSC_RD)
at91_set_B_periph(AT91_PIN_PA14, 1);
if (pins & ATMEL_SSC_RK)
at91_set_B_periph(AT91_PIN_PA9, 1);
if (pins & ATMEL_SSC_RF)
at91_set_B_periph(AT91_PIN_PA8, 1);
}
/*
* Return the device node so that board init code can use it as the
* parent for the device node reflecting how it's used on this board.
*
* 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 AT91SAM9RL_ID_SSC0:
pdev = &at91sam9rl_ssc0_device;
configure_ssc0_pins(pins);
at91_clock_associate("ssc0_clk", &pdev->dev, "pclk");
break;
case AT91SAM9RL_ID_SSC1:
pdev = &at91sam9rl_ssc1_device;
configure_ssc1_pins(pins);
at91_clock_associate("ssc1_clk", &pdev->dev, "pclk");
break;
default:
return;
}
platform_device_register(pdev);
}
#else
void __init at91_add_device_ssc(unsigned id, unsigned pins) {}
#endif
/* --------------------------------------------------------------------
* UART
* -------------------------------------------------------------------- */