From: Hans-Christian Egtvedt hcegtvedt@atmel.com
This adds a driver for the SPI controller found on most AT91 and AVR32 chips, implementing the new SPI API.
Changed in v4: - Update to new API - Handle zero-length transfers appropriately. The user may send a zero-length SPI transfer with SPI_XFER_END set in order to deactivate the chip select after a series of transfers with chip select active. This is useful e.g. when polling the status register of DataFlash.
Signed-off-by: Haavard Skinnemoen hskinnemoen@atmel.com --- cpu/at32ap/at32ap700x/gpio.c | 43 +++++ drivers/spi/Makefile | 1 + drivers/spi/atmel_spi.c | 210 +++++++++++++++++++++ drivers/spi/atmel_spi.h | 95 +++++++++ include/asm-avr32/arch-at32ap700x/chip-features.h | 1 + include/asm-avr32/arch-at32ap700x/clk.h | 6 + include/asm-avr32/arch-at32ap700x/gpio.h | 4 + 7 files changed, 360 insertions(+), 0 deletions(-) create mode 100644 drivers/spi/atmel_spi.c create mode 100644 drivers/spi/atmel_spi.h
diff --git a/cpu/at32ap/at32ap700x/gpio.c b/cpu/at32ap/at32ap700x/gpio.c index 859124a..3da35d4 100644 --- a/cpu/at32ap/at32ap700x/gpio.c +++ b/cpu/at32ap/at32ap700x/gpio.c @@ -21,8 +21,11 @@ */ #include <common.h>
+#include <asm/io.h> + #include <asm/arch/chip-features.h> #include <asm/arch/gpio.h> +#include <asm/arch/memory-map.h>
/* * Lots of small functions here. We depend on --gc-sections getting @@ -142,3 +145,43 @@ void gpio_enable_mmci(void) gpio_select_periph_A(GPIO_PIN_PA15, 0); /* DATA3 */ } #endif + +#ifdef AT32AP700x_CHIP_HAS_SPI +void gpio_enable_spi0(unsigned long cs_mask) +{ + u32 pa_mask = 0; + + gpio_select_periph_A(GPIO_PIN_PA0, 0); /* MISO */ + gpio_select_periph_A(GPIO_PIN_PA1, 0); /* MOSI */ + gpio_select_periph_A(GPIO_PIN_PA2, 0); /* SCK */ + + if (cs_mask & (1 << 0)) + pa_mask |= 1 << 3; /* NPCS0 */ + if (cs_mask & (1 << 1)) + pa_mask |= 1 << 4; /* NPCS1 */ + if (cs_mask & (1 << 2)) + pa_mask |= 1 << 5; /* NPCS2 */ + if (cs_mask & (1 << 3)) + pa_mask |= 1 << 20; /* NPCS3 */ + + __raw_writel(pa_mask, PIOA_BASE + 0x00); + __raw_writel(pa_mask, PIOA_BASE + 0x30); + __raw_writel(pa_mask, PIOA_BASE + 0x10); +} + +void gpio_enable_spi1(unsigned long cs_mask) +{ + gpio_select_periph_B(GPIO_PIN_PA0, 0); /* MISO */ + gpio_select_periph_B(GPIO_PIN_PB1, 0); /* MOSI */ + gpio_select_periph_B(GPIO_PIN_PB5, 0); /* SCK */ + + if (cs_mask & (1 << 0)) + gpio_select_periph_B(GPIO_PIN_PB2, 0); /* NPCS0 */ + if (cs_mask & (1 << 1)) + gpio_select_periph_B(GPIO_PIN_PB3, 0); /* NPCS1 */ + if (cs_mask & (1 << 2)) + gpio_select_periph_B(GPIO_PIN_PB4, 0); /* NPCS2 */ + if (cs_mask & (1 << 3)) + gpio_select_periph_A(GPIO_PIN_PA27, 0); /* NPCS3 */ +} +#endif diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index bc8a104..e66e0ee 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk LIB := $(obj)libspi.a
COBJS-y += mpc8xxx_spi.o +COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o COBJS-$(CONFIG_MXC_SPI) += mxc_spi.o
COBJS := $(COBJS-y) diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c new file mode 100644 index 0000000..317c0b4 --- /dev/null +++ b/drivers/spi/atmel_spi.c @@ -0,0 +1,210 @@ +/* + * Copyright (C) 2007 Atmel Corporation + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ +#include <common.h> +#include <spi.h> +#include <malloc.h> + +#include <asm/io.h> + +#include <asm/arch/clk.h> +#include <asm/arch/memory-map.h> + +#include "atmel_spi.h" + +void spi_init() +{ + +} + +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + struct atmel_spi_slave *as; + unsigned int scbr; + u32 csrx; + void *regs; + + if (cs > 3 || !spi_cs_is_valid(bus, cs)) + return NULL; + + switch (bus) { + case 0: + regs = (void *)SPI0_BASE; + break; +#ifdef SPI1_BASE + case 1: + regs = (void *)SPI1_BASE; + break; +#endif +#ifdef SPI2_BASE + case 2: + regs = (void *)SPI2_BASE; + break; +#endif +#ifdef SPI3_BASE + case 3: + regs = (void *)SPI3_BASE; + break; +#endif + default: + return NULL; + } + + + scbr = (get_spi_clk_rate(bus) + max_hz - 1) / max_hz; + if (scbr > ATMEL_SPI_CSRx_SCBR_MAX) + /* Too low max SCK rate */ + return NULL; + if (scbr < 1) + scbr = 1; + + csrx = ATMEL_SPI_CSRx_SCBR(scbr); + csrx |= ATMEL_SPI_CSRx_BITS(ATMEL_SPI_BITS_8); + if (!(mode & SPI_CPHA)) + csrx |= ATMEL_SPI_CSRx_NCPHA; + if (mode & SPI_CPOL) + csrx |= ATMEL_SPI_CSRx_CPOL; + + as = malloc(sizeof(struct atmel_spi_slave)); + if (!as) + return NULL; + + as->slave.bus = bus; + as->slave.cs = cs; + as->regs = regs; + as->mr = ATMEL_SPI_MR_MSTR | ATMEL_SPI_MR_MODFDIS + | ATMEL_SPI_MR_PCS(~(1 << cs) & 0xf); + spi_writel(as, CSR(cs), csrx); + + return &as->slave; +} + +void spi_free_slave(struct spi_slave *slave) +{ + struct atmel_spi_slave *as = to_atmel_spi(slave); + + free(as); +} + +int spi_claim_bus(struct spi_slave *slave) +{ + struct atmel_spi_slave *as = to_atmel_spi(slave); + + /* Enable the SPI hardware */ + spi_writel(as, CR, ATMEL_SPI_CR_SPIEN); + + /* + * Select the slave. This should set SCK to the correct + * initial state, etc. + */ + spi_writel(as, MR, as->mr); + + return 0; +} + +void spi_release_bus(struct spi_slave *slave) +{ + struct atmel_spi_slave *as = to_atmel_spi(slave); + + /* Disable the SPI hardware */ + spi_writel(as, CR, ATMEL_SPI_CR_SPIDIS); +} + +int spi_xfer(struct spi_slave *slave, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) +{ + struct atmel_spi_slave *as = to_atmel_spi(slave); + unsigned int len_tx; + unsigned int len_rx; + unsigned int len; + int ret; + u32 status; + const u8 *txp = dout; + u8 *rxp = din; + u8 value; + + ret = 0; + if (bitlen == 0) + /* Finish any previously submitted transfers */ + goto out; + + /* + * TODO: The controller can do non-multiple-of-8 bit + * transfers, but this driver currently doesn't support it. + * + * It's also not clear how such transfers are supposed to be + * represented as a stream of bytes...this is a limitation of + * the current SPI interface. + */ + if (bitlen % 8) { + /* Errors always terminate an ongoing transfer */ + flags |= SPI_XFER_END; + goto out; + } + + len = bitlen / 8; + + /* + * The controller can do automatic CS control, but it is + * somewhat quirky, and it doesn't really buy us much anyway + * in the context of U-Boot. + */ + if (flags & SPI_XFER_BEGIN) + spi_cs_activate(slave); + + for (len_tx = 0, len_rx = 0; len_rx < len; ) { + status = spi_readl(as, SR); + + if (status & ATMEL_SPI_SR_OVRES) + return -1; + + if (len_tx < len && (status & ATMEL_SPI_SR_TDRE)) { + if (txp) + value = *txp++; + else + value = 0; + spi_writel(as, TDR, value); + len_tx++; + } + if (status & ATMEL_SPI_SR_RDRF) { + value = spi_readl(as, RDR); + if (rxp) + *rxp++ = value; + len_rx++; + } + } + +out: + if (flags & SPI_XFER_END) { + /* + * Wait until the transfer is completely done before + * we deactivate CS. + */ + do { + status = spi_readl(as, SR); + } while (!(status & ATMEL_SPI_SR_TXEMPTY)); + + spi_cs_deactivate(slave); + } + + return 0; +} diff --git a/drivers/spi/atmel_spi.h b/drivers/spi/atmel_spi.h new file mode 100644 index 0000000..8b69a6d --- /dev/null +++ b/drivers/spi/atmel_spi.h @@ -0,0 +1,95 @@ +/* + * Register definitions for the Atmel AT32/AT91 SPI Controller + */ + +/* Register offsets */ +#define ATMEL_SPI_CR 0x0000 +#define ATMEL_SPI_MR 0x0004 +#define ATMEL_SPI_RDR 0x0008 +#define ATMEL_SPI_TDR 0x000c +#define ATMEL_SPI_SR 0x0010 +#define ATMEL_SPI_IER 0x0014 +#define ATMEL_SPI_IDR 0x0018 +#define ATMEL_SPI_IMR 0x001c +#define ATMEL_SPI_CSR(x) (0x0030 + 4 * (x)) +#define ATMEL_SPI_VERSION 0x00fc + +/* Bits in CR */ +#define ATMEL_SPI_CR_SPIEN (1 << 0) +#define ATMEL_SPI_CR_SPIDIS (1 << 1) +#define ATMEL_SPI_CR_SWRST (1 << 7) +#define ATMEL_SPI_CR_LASTXFER (1 << 24) + +/* Bits in MR */ +#define ATMEL_SPI_MR_MSTR (1 << 0) +#define ATMEL_SPI_MR_PS (1 << 1) +#define ATMEL_SPI_MR_PCSDEC (1 << 2) +#define ATMEL_SPI_MR_FDIV (1 << 3) +#define ATMEL_SPI_MR_MODFDIS (1 << 4) +#define ATMEL_SPI_MR_LLB (1 << 7) +#define ATMEL_SPI_MR_PCS(x) (((x) & 15) << 16) +#define ATMEL_SPI_MR_DLYBCS(x) ((x) << 24) + +/* Bits in RDR */ +#define ATMEL_SPI_RDR_RD(x) (x) +#define ATMEL_SPI_RDR_PCS(x) ((x) << 16) + +/* Bits in TDR */ +#define ATMEL_SPI_TDR_TD(x) (x) +#define ATMEL_SPI_TDR_PCS(x) ((x) << 16) +#define ATMEL_SPI_TDR_LASTXFER (1 << 24) + +/* Bits in SR/IER/IDR/IMR */ +#define ATMEL_SPI_SR_RDRF (1 << 0) +#define ATMEL_SPI_SR_TDRE (1 << 1) +#define ATMEL_SPI_SR_MODF (1 << 2) +#define ATMEL_SPI_SR_OVRES (1 << 3) +#define ATMEL_SPI_SR_ENDRX (1 << 4) +#define ATMEL_SPI_SR_ENDTX (1 << 5) +#define ATMEL_SPI_SR_RXBUFF (1 << 6) +#define ATMEL_SPI_SR_TXBUFE (1 << 7) +#define ATMEL_SPI_SR_NSSR (1 << 8) +#define ATMEL_SPI_SR_TXEMPTY (1 << 9) +#define ATMEL_SPI_SR_SPIENS (1 << 16) + +/* Bits in CSRx */ +#define ATMEL_SPI_CSRx_CPOL (1 << 0) +#define ATMEL_SPI_CSRx_NCPHA (1 << 1) +#define ATMEL_SPI_CSRx_CSAAT (1 << 3) +#define ATMEL_SPI_CSRx_BITS(x) ((x) << 4) +#define ATMEL_SPI_CSRx_SCBR(x) ((x) << 8) +#define ATMEL_SPI_CSRx_SCBR_MAX 0xff +#define ATMEL_SPI_CSRx_DLYBS(x) ((x) << 16) +#define ATMEL_SPI_CSRx_DLYBCT(x) ((x) << 24) + +/* Bits in VERSION */ +#define ATMEL_SPI_VERSION_REV(x) ((x) << 0) +#define ATMEL_SPI_VERSION_MFN(x) ((x) << 16) + +/* Constants for CSRx:BITS */ +#define ATMEL_SPI_BITS_8 0 +#define ATMEL_SPI_BITS_9 1 +#define ATMEL_SPI_BITS_10 2 +#define ATMEL_SPI_BITS_11 3 +#define ATMEL_SPI_BITS_12 4 +#define ATMEL_SPI_BITS_13 5 +#define ATMEL_SPI_BITS_14 6 +#define ATMEL_SPI_BITS_15 7 +#define ATMEL_SPI_BITS_16 8 + +struct atmel_spi_slave { + struct spi_slave slave; + void *regs; + u32 mr; +}; + +static inline struct atmel_spi_slave *to_atmel_spi(struct spi_slave *slave) +{ + return container_of(slave, struct atmel_spi_slave, slave); +} + +/* Register access macros */ +#define spi_readl(as, reg) \ + readl(as->regs + ATMEL_SPI_##reg) +#define spi_writel(as, reg, value) \ + writel(value, as->regs + ATMEL_SPI_##reg) diff --git a/include/asm-avr32/arch-at32ap700x/chip-features.h b/include/asm-avr32/arch-at32ap700x/chip-features.h index 29b1fd6..c47107e 100644 --- a/include/asm-avr32/arch-at32ap700x/chip-features.h +++ b/include/asm-avr32/arch-at32ap700x/chip-features.h @@ -25,6 +25,7 @@ /* Currently, all the AP700x chips have these */ #define AT32AP700x_CHIP_HAS_USART #define AT32AP700x_CHIP_HAS_MMCI +#define AT32AP700x_CHIP_HAS_SPI
/* Only AP7000 has ethernet interface */ #ifdef CONFIG_AT32AP7000 diff --git a/include/asm-avr32/arch-at32ap700x/clk.h b/include/asm-avr32/arch-at32ap700x/clk.h index 385319a..bd6f2e5 100644 --- a/include/asm-avr32/arch-at32ap700x/clk.h +++ b/include/asm-avr32/arch-at32ap700x/clk.h @@ -74,6 +74,12 @@ static inline unsigned long get_mci_clk_rate(void) return get_pbb_clk_rate(); } #endif +#ifdef AT32AP700x_CHIP_HAS_SPI +static inline unsigned long get_spi_clk_rate(unsigned int dev_id) +{ + return get_pba_clk_rate(); +} +#endif
/* Board code may need the SDRAM base clock as a compile-time constant */ #define SDRAMC_BUS_HZ (MAIN_CLK_RATE >> CFG_CLKDIV_HSB) diff --git a/include/asm-avr32/arch-at32ap700x/gpio.h b/include/asm-avr32/arch-at32ap700x/gpio.h index b10a3e4..ef20cea 100644 --- a/include/asm-avr32/arch-at32ap700x/gpio.h +++ b/include/asm-avr32/arch-at32ap700x/gpio.h @@ -216,5 +216,9 @@ void gpio_enable_macb1(void); #ifdef AT32AP700x_CHIP_HAS_MMCI void gpio_enable_mmci(void); #endif +#ifdef AT32AP700x_CHIP_HAS_SPI +void gpio_enable_spi0(unsigned long cs_mask); +void gpio_enable_spi1(unsigned long cs_mask); +#endif
#endif /* __ASM_AVR32_ARCH_GPIO_H__ */