From ac87c17d344ede52d8d421addf92cbb2e271f73e Mon Sep 17 00:00:00 2001 From: Stefano Babic Date: Wed, 19 Jan 2011 22:46:33 +0000 Subject: [PATCH] SPI: mxc_spi: replace fixed offsets with structures This patch cleans driver code replacing all accesses to registers with fixed offsets with a corresponding structure. Signed-off-by: Stefano Babic --- arch/arm/include/asm/arch-mx31/mx31-regs.h | 11 +++ arch/arm/include/asm/arch-mx35/imx-regs.h | 12 +++ arch/arm/include/asm/arch-mx5/imx-regs.h | 12 +++ drivers/spi/mxc_spi.c | 94 +++++++--------------- 4 files changed, 63 insertions(+), 66 deletions(-) diff --git a/arch/arm/include/asm/arch-mx31/mx31-regs.h b/arch/arm/include/asm/arch-mx31/mx31-regs.h index 46ed47cc7b..105f7d8be5 100644 --- a/arch/arm/include/asm/arch-mx31/mx31-regs.h +++ b/arch/arm/include/asm/arch-mx31/mx31-regs.h @@ -64,6 +64,17 @@ struct gpio_regs { u32 gpio_psr; }; +struct cspi_regs { + u32 rxdata; + u32 txdata; + u32 ctrl; + u32 intr; + u32 dma; + u32 stat; + u32 period; + u32 test; +}; + #define IOMUX_PADNUM_MASK 0x1ff #define IOMUX_PIN(gpionum, padnum) ((padnum) & IOMUX_PADNUM_MASK) diff --git a/arch/arm/include/asm/arch-mx35/imx-regs.h b/arch/arm/include/asm/arch-mx35/imx-regs.h index 7978444140..e741fb0bc6 100644 --- a/arch/arm/include/asm/arch-mx35/imx-regs.h +++ b/arch/arm/include/asm/arch-mx35/imx-regs.h @@ -265,6 +265,18 @@ struct gpt_regs { u32 counter; /* counter */ }; +/* CSPI registers */ +struct cspi_regs { + u32 rxdata; + u32 txdata; + u32 ctrl; + u32 intr; + u32 dma; + u32 stat; + u32 period; + u32 test; +}; + /* Watchdog Timer (WDOG) registers */ struct wdog_regs { u16 wcr; /* Control */ diff --git a/arch/arm/include/asm/arch-mx5/imx-regs.h b/arch/arm/include/asm/arch-mx5/imx-regs.h index 09b69f6b57..a1849f8c05 100644 --- a/arch/arm/include/asm/arch-mx5/imx-regs.h +++ b/arch/arm/include/asm/arch-mx5/imx-regs.h @@ -256,6 +256,18 @@ struct src { u32 simr; }; +/* CSPI registers */ +struct cspi_regs { + u32 rxdata; + u32 txdata; + u32 ctrl; + u32 cfg; + u32 intr; + u32 dma; + u32 stat; + u32 period; +}; + struct iim_regs { u32 stat; u32 statm; diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index 2a4ddade32..6474eb802d 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -36,16 +36,6 @@ #include -#define MXC_CSPIRXDATA 0x00 -#define MXC_CSPITXDATA 0x04 -#define MXC_CSPICTRL 0x08 -#define MXC_CSPIINT 0x0C -#define MXC_CSPIDMA 0x10 -#define MXC_CSPISTAT 0x14 -#define MXC_CSPIPERIOD 0x18 -#define MXC_CSPITEST 0x1C -#define MXC_CSPIRESET 0x00 - #define MXC_CSPICTRL_EN (1 << 0) #define MXC_CSPICTRL_MODE (1 << 1) #define MXC_CSPICTRL_XCH (1 << 2) @@ -76,15 +66,6 @@ static unsigned long spi_bases[] = { #include #include -#define MXC_CSPIRXDATA 0x00 -#define MXC_CSPITXDATA 0x04 -#define MXC_CSPICTRL 0x08 -#define MXC_CSPICON 0x0C -#define MXC_CSPIINT 0x10 -#define MXC_CSPIDMA 0x14 -#define MXC_CSPISTAT 0x18 -#define MXC_CSPIPERIOD 0x1C -#define MXC_CSPIRESET 0x00 #define MXC_CSPICTRL_EN (1 << 0) #define MXC_CSPICTRL_MODE (1 << 1) #define MXC_CSPICTRL_XCH (1 << 2) @@ -119,16 +100,6 @@ static unsigned long spi_bases[] = { #include #include -#define MXC_CSPIRXDATA 0x00 -#define MXC_CSPITXDATA 0x04 -#define MXC_CSPICTRL 0x08 -#define MXC_CSPIINT 0x0C -#define MXC_CSPIDMA 0x10 -#define MXC_CSPISTAT 0x14 -#define MXC_CSPIPERIOD 0x18 -#define MXC_CSPITEST 0x1C -#define MXC_CSPIRESET 0x00 - #define MXC_CSPICTRL_EN (1 << 0) #define MXC_CSPICTRL_MODE (1 << 1) #define MXC_CSPICTRL_XCH (1 << 2) @@ -158,6 +129,9 @@ static unsigned long spi_bases[] = { #define OUT MXC_GPIO_DIRECTION_OUT +#define reg_read readl +#define reg_write(a, v) writel(v, a) + struct mxc_spi_slave { struct spi_slave slave; unsigned long base; @@ -174,16 +148,6 @@ static inline struct mxc_spi_slave *to_mxc_spi_slave(struct spi_slave *slave) return container_of(slave, struct mxc_spi_slave, slave); } -static inline u32 reg_read(unsigned long addr) -{ - return *(volatile unsigned long*)addr; -} - -static inline void reg_write(unsigned long addr, u32 val) -{ - *(volatile unsigned long*)addr = val; -} - void spi_cs_activate(struct spi_slave *slave) { struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave); @@ -254,17 +218,18 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, u32 clk_src = mxc_get_clock(MXC_CSPI_CLK); s32 pre_div = 0, post_div = 0, i, reg_ctrl, reg_config; u32 ss_pol = 0, sclkpol = 0, sclkpha = 0; + struct cspi_regs *regs = (struct cspi_regs *)mxcs->base; if (max_hz == 0) { printf("Error: desired clock is 0\n"); return -1; } - reg_ctrl = reg_read(mxcs->base + MXC_CSPICTRL); + reg_ctrl = reg_read(®s->ctrl); /* Reset spi */ - reg_write(mxcs->base + MXC_CSPICTRL, 0); - reg_write(mxcs->base + MXC_CSPICTRL, (reg_ctrl | 0x1)); + reg_write(®s->ctrl, 0); + reg_write(®s->ctrl, (reg_ctrl | 0x1)); /* * The following computation is taken directly from Freescale's code. @@ -312,7 +277,7 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, if (mode & SPI_CPHA) sclkpha = 1; - reg_config = reg_read(mxcs->base + MXC_CSPICON); + reg_config = reg_read(®s->cfg); /* * Configuration register setup @@ -326,18 +291,17 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs, (sclkpha << (cs + MXC_CSPICON_PHA)); debug("reg_ctrl = 0x%x\n", reg_ctrl); - reg_write(mxcs->base + MXC_CSPICTRL, reg_ctrl); + reg_write(®s->ctrl, reg_ctrl); debug("reg_config = 0x%x\n", reg_config); - reg_write(mxcs->base + MXC_CSPICON, reg_config); + reg_write(®s->cfg, reg_config); /* save config register and control register */ mxcs->ctrl_reg = reg_ctrl; mxcs->cfg_reg = reg_config; /* clear interrupt reg */ - reg_write(mxcs->base + MXC_CSPIINT, 0); - reg_write(mxcs->base + MXC_CSPISTAT, - MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); + reg_write(®s->intr, 0); + reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); return 0; } @@ -349,6 +313,7 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave); int nbytes = (bitlen + 7) / 8; u32 data, cnt, i; + struct cspi_regs *regs = (struct cspi_regs *)mxcs->base; debug("%s: bitlen %d dout 0x%x din 0x%x\n", __func__, bitlen, (u32)dout, (u32)din); @@ -357,14 +322,13 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, ~MXC_CSPICTRL_BITCOUNT(MXC_CSPICTRL_MAXBITS)) | MXC_CSPICTRL_BITCOUNT(bitlen - 1); - reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg | MXC_CSPICTRL_EN); + reg_write(®s->ctrl, mxcs->ctrl_reg | MXC_CSPICTRL_EN); #ifdef CONFIG_MX51 - reg_write(mxcs->base + MXC_CSPICON, mxcs->cfg_reg); + reg_write(®s->cfg, mxcs->cfg_reg); #endif /* Clear interrupt register */ - reg_write(mxcs->base + MXC_CSPISTAT, - MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); + reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); /* * The SPI controller works only with words, @@ -381,7 +345,7 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, } debug("Sending SPI 0x%x\n", data); - reg_write(mxcs->base + MXC_CSPITXDATA, data); + reg_write(®s->txdata, data); nbytes -= cnt; } @@ -402,28 +366,27 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, dout += 4; } debug("Sending SPI 0x%x\n", data); - reg_write(mxcs->base + MXC_CSPITXDATA, data); + reg_write(®s->txdata, data); nbytes -= 4; } /* FIFO is written, now starts the transfer setting the XCH bit */ - reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg | + reg_write(®s->ctrl, mxcs->ctrl_reg | MXC_CSPICTRL_EN | MXC_CSPICTRL_XCH); /* Wait until the TC (Transfer completed) bit is set */ - while ((reg_read(mxcs->base + MXC_CSPISTAT) & MXC_CSPICTRL_TC) == 0) + while ((reg_read(®s->stat) & MXC_CSPICTRL_TC) == 0) ; /* Transfer completed, clear any pending request */ - reg_write(mxcs->base + MXC_CSPISTAT, - MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); + reg_write(®s->stat, MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); nbytes = (bitlen + 7) / 8; cnt = nbytes % 32; if (bitlen % 32) { - data = reg_read(mxcs->base + MXC_CSPIRXDATA); + data = reg_read(®s->rxdata); cnt = (bitlen % 32) / 8; data = cpu_to_be32(data) >> ((sizeof(data) - cnt) * 8); debug("SPI Rx unaligned: 0x%x\n", data); @@ -436,7 +399,7 @@ int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen, while (nbytes > 0) { u32 tmp; - tmp = reg_read(mxcs->base + MXC_CSPIRXDATA); + tmp = reg_read(®s->rxdata); data = cpu_to_be32(tmp); debug("SPI Rx: 0x%x 0x%x\n", tmp, data); cnt = min(nbytes, sizeof(data)); @@ -468,7 +431,6 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, spi_cs_activate(slave); while (n_bytes > 0) { - if (n_bytes < MAX_SPI_BYTES) blk_size = n_bytes; else @@ -572,13 +534,13 @@ void spi_free_slave(struct spi_slave *slave) int spi_claim_bus(struct spi_slave *slave) { struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave); + struct cspi_regs *regs = (struct cspi_regs *)mxcs->base; - reg_write(mxcs->base + MXC_CSPIRESET, 1); + reg_write(®s->rxdata, 1); udelay(1); - reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg); - reg_write(mxcs->base + MXC_CSPIPERIOD, - MXC_CSPIPERIOD_32KHZ); - reg_write(mxcs->base + MXC_CSPIINT, 0); + reg_write(®s->ctrl, mxcs->ctrl_reg); + reg_write(®s->period, MXC_CSPIPERIOD_32KHZ); + reg_write(®s->intr, 0); return 0; } -- 2.25.1