version 1.1, 2007/12/18 15:44:21 |
version 1.3, 2007/12/20 15:25:44 |
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#include <sys/types.h> |
#include <sys/types.h> |
#include <sys/device.h> |
#include <sys/device.h> |
#include <sys/bus.h> |
#include <sys/bus.h> |
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#include <sys/bus_spi.h> |
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#include <arch/sa7s64/dev/at91sam7s64.h> |
#include <libkern/printf.h> |
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#include <arch/sam7s64/dev/at91sam7.h> |
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/* |
/* |
* SPI driver. |
* SPI driver. |
*/ |
*/ |
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struct saspi_dd { |
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struct spi_bus_handle sd_sbh; |
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struct bus_handle *sd_bhp; |
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}; |
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int saspi_attach(struct device *, uint32_t, uint8_t); |
int saspi_attach(struct device *, uint32_t, uint8_t); |
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void saspi_init(struct saspi_dd *ddp); |
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uint8_t saspi_transmit(void *selfdd, uint8_t data); |
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struct driver spi_dr = { |
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1, |
struct driver saspi_dr = { |
spi_attach, |
sizeof(struct saspi_dd), |
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saspi_attach, |
NULL, |
NULL, |
NULL |
NULL |
}; |
}; |
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int |
int |
spi_attach(struct device *self, uint32_t loc, uint8_t flags) |
saspi_attach(struct device *self, uint32_t loc, uint8_t flags) |
{ |
{ |
struct XXX_dd *ddp = self->dv_devdata; |
struct saspi_dd *ddp = self->dv_devdata; |
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/* grab bus_handle */ |
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ddp->sd_bhp = self->dv_parent->dv_aux; |
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printf("SAM7 SPI: "); |
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/* |
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* XXX Check if card present and fail if it is not. |
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*/ |
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/* 'Card Present' on PA15 */ |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_PIOA_ODR, 1 << 15); |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_PIOA_PER, 1 << 15); |
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/* Write Protect' on PA16 */ |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_PIOA_ODR, 1 << 16); |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_PIOA_PER, 1 << 16); |
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if((bus_read_4(ddp->sd_bhp, (uint32_t)AT91C_PIOA_PDSR) & 1 << 15) == 0) |
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printf("card present; "); |
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else { |
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printf("card is not presented\n"); |
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return(-1); |
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} |
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printf("write %s\n", (bus_read_4(ddp->sd_bhp, (uint32_t)AT91C_PIOA_PDSR) & 1 << 16) ? "protect" : "allowed"); |
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/* |
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* Initialize ourselfes and provide spi_bus_handle to children throught dv_aux. |
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*/ |
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saspi_init(ddp); |
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ddp->sd_sbh.sb_transmitfunc = saspi_transmit; |
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ddp->sd_sbh.sb_dd = ddp; |
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self->dv_aux = &ddp->sd_sbh; |
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return(0); |
return(0); |
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} |
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void |
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saspi_init(struct saspi_dd *ddp) |
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{ |
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/* |
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* Initialize on-chip SPI controller. |
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*/ |
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/* |
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* Disassociate SPI chip select, clock and data lines from PIO. |
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* |
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* PA11 - NPCS0 |
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* PA12 - MISO |
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* PA13 - MOSI |
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* PA14 - SPCK |
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*/ |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_PIOA_PDR, 1 << 11 | 1 << 12 | 1 << 13 | 1 << 14); |
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/* assign pins to Peripheral A */ |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_PIOA_ASR, 1 << 11 | 1 << 12 | 1 << 13 | 1 << 14); |
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/* reset and enable SPI */ |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_SPI_CR, AT91C_SPI_SPIEN | AT91C_SPI_SWRST); |
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/* XXX just to be sure */ |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_SPI_CR, AT91C_SPI_SPIEN); |
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/* set SPI mode to master; disable decoding of Chip Select; PCS 1110 (using fixed CS line) */ |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_SPI_CR, AT91C_SPI_MSTR | AT91C_SPI_MODFDIS | 0x0e << 16); /* XXX 15|16 */ |
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/* |
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* Configure Chip Select Register no. 0 (so no offset from SPI_CSR). |
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* CPOL (Clock Polarity) is 0 (SPCK inactive is logic 0); |
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* NCPHA (Clock Phase) is 1; |
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* 8 bits per transfer; |
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* XXX SCBR=4a; |
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*/ |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_SPI_CSR, AT91C_SPI_NCPHA | 0x4a00); |
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/* enable PDC transfers to/from SPI */ |
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// bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_PDC_PTCR, AT91C_PDC_TXTEN | AT91C_PDC_RXTEN); |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_SPI_PTCR, AT91C_PDC_TXTEN | AT91C_PDC_RXTEN); |
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} |
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uint8_t |
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saspi_transmit(void *selfdd, uint8_t data) |
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{ |
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struct saspi_dd *ddp = (struct saspi_dd *)selfdd; |
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/* |
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* Shift byte on the SPI bus. |
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*/ |
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/* wait for Transmit Data Register Empty flag */ |
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while((bus_read_4(ddp->sd_bhp, (uint32_t)AT91C_SPI_SR) & AT91C_SPI_TDRE) == 0) |
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; |
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/* okay, send our byte */ |
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bus_write_4(ddp->sd_bhp, (uint32_t)AT91C_SPI_TDR, 0x0000ffff & data); |
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/* wait while Receive Register is full and read it */ |
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while((bus_read_4(ddp->sd_bhp, (uint32_t)AT91C_SPI_SR) & AT91C_SPI_RDRF) == 0) |
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; |
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return( bus_read_4(ddp->sd_bhp, (uint32_t)AT91C_SPI_RDR) & 0x0000ffff ); |
} |
} |
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