diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/misc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/fsl_pmic.c | 200 | ||||
| -rw-r--r-- | drivers/rtc/mc13783-rtc.c | 72 | ||||
| -rw-r--r-- | drivers/spi/mxc_spi.c | 231 |
4 files changed, 427 insertions, 77 deletions
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index f6df60f..96aa331 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -31,6 +31,7 @@ COBJS-$(CONFIG_FSL_LAW) += fsl_law.o COBJS-$(CONFIG_NS87308) += ns87308.o COBJS-$(CONFIG_STATUS_LED) += status_led.o COBJS-$(CONFIG_TWL4030_LED) += twl4030_led.o +COBJS-$(CONFIG_FSL_PMIC) += fsl_pmic.o COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/misc/fsl_pmic.c b/drivers/misc/fsl_pmic.c new file mode 100644 index 0000000..87f0aed --- /dev/null +++ b/drivers/misc/fsl_pmic.c @@ -0,0 +1,200 @@ +/* + * (C) Copyright 2008-2009 Freescale Semiconductor, Inc. + * + * 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 <config.h> +#include <common.h> +#include <spi.h> +#include <asm/errno.h> +#include <linux/types.h> +#include <fsl_pmic.h> + +static struct spi_slave *slave; + +struct spi_slave *pmic_spi_probe(void) +{ + return spi_setup_slave(CONFIG_FSL_PMIC_BUS, + CONFIG_FSL_PMIC_CS, + CONFIG_FSL_PMIC_CLK, + CONFIG_FSL_PMIC_MODE); +} + +void pmic_spi_free(struct spi_slave *slave) +{ + if (slave) + spi_free_slave(slave); +} + +u32 pmic_reg(u32 reg, u32 val, u32 write) +{ + u32 pmic_tx, pmic_rx; + + if (!slave) { + slave = pmic_spi_probe(); + + if (!slave) + return -1; + } + + if (reg > 63 || write > 1) { + printf("<reg num> = %d is invalid. Should be less then 63\n", + reg); + return -1; + } + + if (spi_claim_bus(slave)) + return -1; + + pmic_tx = (write << 31) | (reg << 25) | (val & 0x00FFFFFF); + + if (spi_xfer(slave, 4 << 3, &pmic_tx, &pmic_rx, + SPI_XFER_BEGIN | SPI_XFER_END)) { + spi_release_bus(slave); + return -1; + } + + if (write) { + pmic_tx &= ~(1 << 31); + if (spi_xfer(slave, 4 << 3, &pmic_tx, &pmic_rx, + SPI_XFER_BEGIN | SPI_XFER_END)) { + spi_release_bus(slave); + return -1; + } + } + + spi_release_bus(slave); + return pmic_rx; +} + +void pmic_reg_write(u32 reg, u32 value) +{ + pmic_reg(reg, value, 1); +} + +u32 pmic_reg_read(u32 reg) +{ + return pmic_reg(reg, 0, 0); +} + +void pmic_show_pmic_info(void) +{ + u32 rev_id; + + rev_id = pmic_reg_read(REG_IDENTIFICATION); + printf("PMIC ID: 0x%08x [Rev: ", rev_id); + switch (rev_id & 0x1F) { + case 0x1: + puts("1.0"); + break; + case 0x9: + puts("1.1"); + break; + case 0xA: + puts("1.2"); + break; + case 0x10: + puts("2.0"); + break; + case 0x11: + puts("2.1"); + break; + case 0x18: + puts("3.0"); + break; + case 0x19: + puts("3.1"); + break; + case 0x1A: + puts("3.2"); + break; + case 0x2: + puts("3.2A"); + break; + case 0x1B: + puts("3.3"); + break; + case 0x1D: + puts("3.5"); + break; + default: + puts("unknown"); + break; + } + puts("]\n"); +} + +static void pmic_dump(int numregs) +{ + u32 val; + int i; + + pmic_show_pmic_info(); + for (i = 0; i < numregs; i++) { + val = pmic_reg_read(i); + if (!(i % 8)) + printf ("\n0x%02x: ", i); + printf("%08x ", val); + } + puts("\n"); +} + +int do_pmic(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + char *cmd; + int nregs; + u32 val; + + /* at least two arguments please */ + if (argc < 2) { + cmd_usage(cmdtp); + return 1; + } + + cmd = argv[1]; + if (strcmp(cmd, "dump") == 0) { + if (argc < 3) { + cmd_usage(cmdtp); + return 1; + } + nregs = simple_strtoul(argv[2], NULL, 16); + pmic_dump(nregs); + return 0; + } + if (strcmp(cmd, "write") == 0) { + if (argc < 4) { + cmd_usage(cmdtp); + return 1; + } + nregs = simple_strtoul(argv[2], NULL, 16); + val = simple_strtoul(argv[3], NULL, 16); + pmic_reg_write(nregs, val); + return 0; + } + /* No subcommand found */ + return 1; +} + +U_BOOT_CMD( + pmic, CONFIG_SYS_MAXARGS, 1, do_pmic, + "Freescale PMIC (Atlas)", + "dump [numregs] dump registers\n" + "pmic write <reg> <value> - write register" +); diff --git a/drivers/rtc/mc13783-rtc.c b/drivers/rtc/mc13783-rtc.c index 416f50d..4e18f80 100644 --- a/drivers/rtc/mc13783-rtc.c +++ b/drivers/rtc/mc13783-rtc.c @@ -23,53 +23,30 @@ #include <common.h> #include <rtc.h> #include <spi.h> - -static struct spi_slave *slave; +#include <fsl_pmic.h> int rtc_get(struct rtc_time *rtc) { u32 day1, day2, time; - u32 reg; - int err, tim, i = 0; - - if (!slave) { - /* FIXME: Verify the max SCK rate */ - slave = spi_setup_slave(CONFIG_MC13783_SPI_BUS, - CONFIG_MC13783_SPI_CS, 1000000, - SPI_MODE_2 | SPI_CS_HIGH); - if (!slave) - return -1; - } - - if (spi_claim_bus(slave)) - return -1; + int tim, i = 0; do { - reg = 0x2c000000; - err = spi_xfer(slave, 32, (uchar *)®, (uchar *)&day1, - SPI_XFER_BEGIN | SPI_XFER_END); - - if (err) - return err; - - reg = 0x28000000; - err = spi_xfer(slave, 32, (uchar *)®, (uchar *)&time, - SPI_XFER_BEGIN | SPI_XFER_END); + day1 = pmic_reg_read(REG_RTC_DAY); + if (day1 < 0) + return -1; - if (err) - return err; + time = pmic_reg_read(REG_RTC_TIME); + if (time < 0) + return -1; - reg = 0x2c000000; - err = spi_xfer(slave, 32, (uchar *)®, (uchar *)&day2, - SPI_XFER_BEGIN | SPI_XFER_END); + day2 = pmic_reg_read(REG_RTC_DAY); + if (day2 < 0) + return -1; - if (err) - return err; } while (day1 != day2 && i++ < 3); - spi_release_bus(slave); - tim = day1 * 86400 + time; + to_tm(tim, rtc); rtc->tm_yday = 0; @@ -80,34 +57,15 @@ int rtc_get(struct rtc_time *rtc) int rtc_set(struct rtc_time *rtc) { - u32 time, day, reg; - - if (!slave) { - /* FIXME: Verify the max SCK rate */ - slave = spi_setup_slave(CONFIG_MC13783_SPI_BUS, - CONFIG_MC13783_SPI_CS, 1000000, - SPI_MODE_2 | SPI_CS_HIGH); - if (!slave) - return -1; - } + u32 time, day; time = mktime(rtc->tm_year, rtc->tm_mon, rtc->tm_mday, rtc->tm_hour, rtc->tm_min, rtc->tm_sec); day = time / 86400; time %= 86400; - if (spi_claim_bus(slave)) - return -1; - - reg = 0x2c000000 | day | 0x80000000; - spi_xfer(slave, 32, (uchar *)®, (uchar *)&day, - SPI_XFER_BEGIN | SPI_XFER_END); - - reg = 0x28000000 | time | 0x80000000; - spi_xfer(slave, 32, (uchar *)®, (uchar *)&time, - SPI_XFER_BEGIN | SPI_XFER_END); - - spi_release_bus(slave); + pmic_reg_write(REG_RTC_DAY, day); + pmic_reg_write(REG_RTC_TIME, time); return 0; } diff --git a/drivers/spi/mxc_spi.c b/drivers/spi/mxc_spi.c index 3a45200..e15a63c 100644 --- a/drivers/spi/mxc_spi.c +++ b/drivers/spi/mxc_spi.c @@ -31,7 +31,7 @@ #error "i.MX27 CSPI not supported due to drastic differences in register definisions" \ "See linux mxc_spi driver from Freescale for details." -#else +#elif defined(CONFIG_MX31) #include <asm/arch/mx31.h> @@ -56,6 +56,9 @@ #define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 24) #define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0x1f) << 8) #define MXC_CSPICTRL_DATARATE(x) (((x) & 0x7) << 16) +#define MXC_CSPICTRL_TC (1 << 8) +#define MXC_CSPICTRL_RXOVF (1 << 6) +#define MXC_CSPICTRL_MAXBITS 0x1f #define MXC_CSPIPERIOD_32KHZ (1 << 15) @@ -65,12 +68,63 @@ static unsigned long spi_bases[] = { 0x53f84000, }; +#define OUT MX31_GPIO_DIRECTION_OUT +#define mxc_gpio_direction mx31_gpio_direction +#define mxc_gpio_set mx31_gpio_set +#elif defined(CONFIG_MX51) +#include <asm/arch/imx-regs.h> +#include <asm/arch/clock.h> + +#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) +#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 12) +#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0xfff) << 20) +#define MXC_CSPICTRL_PREDIV(x) (((x) & 0xF) << 12) +#define MXC_CSPICTRL_POSTDIV(x) (((x) & 0xF) << 8) +#define MXC_CSPICTRL_SELCHAN(x) (((x) & 0x3) << 18) +#define MXC_CSPICTRL_MAXBITS 0xfff +#define MXC_CSPICTRL_TC (1 << 7) +#define MXC_CSPICTRL_RXOVF (1 << 6) + +#define MXC_CSPIPERIOD_32KHZ (1 << 15) + +/* Bit position inside CTRL register to be associated with SS */ +#define MXC_CSPICTRL_CHAN 18 + +/* Bit position inside CON register to be associated with SS */ +#define MXC_CSPICON_POL 4 +#define MXC_CSPICON_PHA 0 +#define MXC_CSPICON_SSPOL 12 + +static unsigned long spi_bases[] = { + CSPI1_BASE_ADDR, + CSPI2_BASE_ADDR, + CSPI3_BASE_ADDR, +}; +#define mxc_gpio_direction(gpio, dir) (0) +#define mxc_gpio_set(gpio, value) {} +#define OUT 1 +#else +#error "Unsupported architecture" #endif struct mxc_spi_slave { struct spi_slave slave; unsigned long base; u32 ctrl_reg; +#if defined(CONFIG_MX51) + u32 cfg_reg; +#endif int gpio; }; @@ -89,34 +143,161 @@ 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); + if (mxcs->gpio > 0) + mxc_gpio_set(mxcs->gpio, mxcs->ctrl_reg & MXC_CSPICTRL_SSPOL); +} + +void spi_cs_deactivate(struct spi_slave *slave) +{ + struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave); + if (mxcs->gpio > 0) + mxc_gpio_set(mxcs->gpio, + !(mxcs->ctrl_reg & MXC_CSPICTRL_SSPOL)); +} + +#ifdef CONFIG_MX51 +static s32 spi_cfg(struct mxc_spi_slave *mxcs, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + 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; + + if (max_hz == 0) { + printf("Error: desired clock is 0\n"); + return -1; + } + + reg_ctrl = reg_read(mxcs->base + MXC_CSPICTRL); + + /* Reset spi */ + reg_write(mxcs->base + MXC_CSPICTRL, 0); + reg_write(mxcs->base + MXC_CSPICTRL, (reg_ctrl | 0x1)); + + /* + * The following computation is taken directly from Freescale's code. + */ + if (clk_src > max_hz) { + pre_div = clk_src / max_hz; + if (pre_div > 16) { + post_div = pre_div / 16; + pre_div = 15; + } + if (post_div != 0) { + for (i = 0; i < 16; i++) { + if ((1 << i) >= post_div) + break; + } + if (i == 16) { + printf("Error: no divider for the freq: %d\n", + max_hz); + return -1; + } + post_div = i; + } + } + + debug("pre_div = %d, post_div=%d\n", pre_div, post_div); + reg_ctrl = (reg_ctrl & ~MXC_CSPICTRL_SELCHAN(3)) | + MXC_CSPICTRL_SELCHAN(cs); + reg_ctrl = (reg_ctrl & ~MXC_CSPICTRL_PREDIV(0x0F)) | + MXC_CSPICTRL_PREDIV(pre_div); + reg_ctrl = (reg_ctrl & ~MXC_CSPICTRL_POSTDIV(0x0F)) | + MXC_CSPICTRL_POSTDIV(post_div); + + /* always set to master mode */ + reg_ctrl |= 1 << (cs + 4); + + /* We need to disable SPI before changing registers */ + reg_ctrl &= ~MXC_CSPICTRL_EN; + + if (mode & SPI_CS_HIGH) + ss_pol = 1; + + if (!(mode & SPI_CPOL)) + sclkpol = 1; + + if (mode & SPI_CPHA) + sclkpha = 1; + + reg_config = reg_read(mxcs->base + MXC_CSPICON); + + /* + * Configuration register setup + * The MX51 has support different setup for each SS + */ + reg_config = (reg_config & ~(1 << (cs + MXC_CSPICON_SSPOL))) | + (ss_pol << (cs + MXC_CSPICON_SSPOL)); + reg_config = (reg_config & ~(1 << (cs + MXC_CSPICON_POL))) | + (sclkpol << (cs + MXC_CSPICON_POL)); + reg_config = (reg_config & ~(1 << (cs + MXC_CSPICON_PHA))) | + (sclkpha << (cs + MXC_CSPICON_PHA)); + + debug("reg_ctrl = 0x%x\n", reg_ctrl); + reg_write(mxcs->base + MXC_CSPICTRL, reg_ctrl); + debug("reg_config = 0x%x\n", reg_config); + reg_write(mxcs->base + MXC_CSPICON, 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); + + return 0; +} +#endif + static u32 spi_xchg_single(struct spi_slave *slave, u32 data, int bitlen, unsigned long flags) { struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave); - unsigned int cfg_reg = reg_read(mxcs->base + MXC_CSPICTRL); - mxcs->ctrl_reg = (mxcs->ctrl_reg & ~MXC_CSPICTRL_BITCOUNT(31)) | + if (flags & SPI_XFER_BEGIN) + spi_cs_activate(slave); + + mxcs->ctrl_reg = (mxcs->ctrl_reg & + ~MXC_CSPICTRL_BITCOUNT(MXC_CSPICTRL_MAXBITS)) | MXC_CSPICTRL_BITCOUNT(bitlen - 1); - if (cfg_reg != mxcs->ctrl_reg) - reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg); + reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg | MXC_CSPICTRL_EN); +#ifdef CONFIG_MX51 + reg_write(mxcs->base + MXC_CSPICON, mxcs->cfg_reg); +#endif - if (mxcs->gpio > 0 && (flags & SPI_XFER_BEGIN)) - mx31_gpio_set(mxcs->gpio, mxcs->ctrl_reg & MXC_CSPICTRL_SSPOL); + /* Clear interrupt register */ + reg_write(mxcs->base + MXC_CSPISTAT, + MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); + debug("Sending SPI 0x%x\n", data); reg_write(mxcs->base + MXC_CSPITXDATA, data); - reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg | MXC_CSPICTRL_XCH); + /* FIFO is written, now starts the transfer setting the XCH bit */ + reg_write(mxcs->base + MXC_CSPICTRL, mxcs->ctrl_reg | + MXC_CSPICTRL_EN | MXC_CSPICTRL_XCH); - while (reg_read(mxcs->base + MXC_CSPICTRL) & MXC_CSPICTRL_XCH) + /* Wait until the TC (Transfer completed) bit is set */ + while ((reg_read(mxcs->base + MXC_CSPISTAT) & MXC_CSPICTRL_TC) == 0) ; - if (mxcs->gpio > 0 && (flags & SPI_XFER_END)) { - mx31_gpio_set(mxcs->gpio, - !(mxcs->ctrl_reg & MXC_CSPICTRL_SSPOL)); - } + /* Transfer completed, clear any pending request */ + reg_write(mxcs->base + MXC_CSPISTAT, + MXC_CSPICTRL_TC | MXC_CSPICTRL_RXOVF); + + data = reg_read(mxcs->base + MXC_CSPIRXDATA); + debug("SPI Rx: 0x%x\n", data); + + if (flags & SPI_XFER_END) + spi_cs_deactivate(slave); + + return data; - return reg_read(mxcs->base + MXC_CSPIRXDATA); } int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, @@ -176,7 +357,7 @@ static int decode_cs(struct mxc_spi_slave *mxcs, unsigned int cs) if (cs > 3) { mxcs->gpio = cs >> 8; cs &= 3; - ret = mx31_gpio_direction(mxcs->gpio, MX31_GPIO_DIRECTION_OUT); + ret = mxc_gpio_direction(mxcs->gpio, OUT); if (ret) { printf("mxc_spi: cannot setup gpio %d\n", mxcs->gpio); return -EINVAL; @@ -210,6 +391,20 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, cs = ret; + mxcs->slave.bus = bus; + mxcs->slave.cs = cs; + mxcs->base = spi_bases[bus]; + +#ifdef CONFIG_MX51 + /* Can be used for i.MX31 too ? */ + ctrl_reg = 0; + ret = spi_cfg(mxcs, cs, max_hz, mode); + if (ret) { + printf("mxc_spi: cannot setup SPI controller\n"); + free(mxcs); + return NULL; + } +#else ctrl_reg = MXC_CSPICTRL_CHIPSELECT(cs) | MXC_CSPICTRL_BITCOUNT(31) | MXC_CSPICTRL_DATARATE(7) | /* FIXME: calculate data rate */ @@ -222,12 +417,8 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, ctrl_reg |= MXC_CSPICTRL_POL; if (mode & SPI_CS_HIGH) ctrl_reg |= MXC_CSPICTRL_SSPOL; - - mxcs->slave.bus = bus; - mxcs->slave.cs = cs; - mxcs->base = spi_bases[bus]; mxcs->ctrl_reg = ctrl_reg; - +#endif return &mxcs->slave; } |