2014-11-05 17:01 GMT+01:00 Boris Brezillon <boris.brezil...@free-electrons.com>: > The EBI (External Bus Interface) is used to access external peripherals > (NOR, SRAM, NAND, and other specific devices like ethernet controllers). > Each device is assigned a CS line and an address range and can have its > own configuration (timings, access mode, bus width, ...). > This driver provides a generic DT binding to configure a device according > to its requirements. > For specific device controllers (like the NAND one) the SMC timings > should be configured by the controller driver through the matrix and > smc syscon regmaps. > > Signed-off-by: Jean-Jacques Hiblot <jjhib...@traphandler.com> > Signed-off-by: Boris Brezillon <boris.brezil...@free-electrons.com> > --- > drivers/memory/Kconfig | 11 + > drivers/memory/Makefile | 1 + > drivers/memory/atmel-ebi.c | 615 > +++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 627 insertions(+) > create mode 100644 drivers/memory/atmel-ebi.c > > diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig > index 6d91c27..dfe24a2 100644 > --- a/drivers/memory/Kconfig > +++ b/drivers/memory/Kconfig > @@ -17,6 +17,17 @@ config ATMEL_SDRAMC > Starting with the at91sam9g45, this controller supports SDR, DDR and > LP-DDR memories. > > +config ATMEL_EBI > + bool "Atmel EBI driver" > + default y > + depends on ARCH_AT91 && OF > + select MFD_SYSCON > + help > + Driver for Atmel EBI controller. > + Used to configure the EBI (external bus interface) when the device- > + tree is used. This bus supports NANDs, external ethernet controller, > + SRAMs, ATA devices, etc. > + > config TI_AEMIF > tristate "Texas Instruments AEMIF driver" > depends on (ARCH_DAVINCI || ARCH_KEYSTONE) && OF > diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile > index c32d319..7ca2c19 100644 > --- a/drivers/memory/Makefile > +++ b/drivers/memory/Makefile > @@ -6,6 +6,7 @@ ifeq ($(CONFIG_DDR),y) > obj-$(CONFIG_OF) += of_memory.o > endif > obj-$(CONFIG_ATMEL_SDRAMC) += atmel-sdramc.o > +obj-$(CONFIG_ATMEL_EBI) += atmel-ebi.o > obj-$(CONFIG_TI_AEMIF) += ti-aemif.o > obj-$(CONFIG_TI_EMIF) += emif.o > obj-$(CONFIG_FSL_CORENET_CF) += fsl-corenet-cf.o > diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c > new file mode 100644 > index 0000000..41bc893 > --- /dev/null > +++ b/drivers/memory/atmel-ebi.c > @@ -0,0 +1,615 @@ > +/* > + * EBI driver for Atmel SAM9 chips > + * inspired by the fsl weim bus driver > + * > + * Copyright (C) 2013 JJ Hiblot. > + * > + * This file is licensed under the terms of the GNU General Public > + * License version 2. This program is licensed "as is" without any > + * warranty of any kind, whether express or implied. > + */ > + > +#include <linux/clk.h> > +#include <linux/io.h> > +#include <linux/mfd/syscon.h> > +#include <linux/mfd/syscon/atmel-matrix.h> > +#include <linux/mfd/syscon/atmel-smc.h> > +#include <linux/module.h> > +#include <linux/of_device.h> > +#include <linux/regmap.h> > + > +#define AT91SAM9_SMC_READ_MODE_MSK BIT(0) > +#define AT91SAM9_SMC_READ_NCS_MODE 0 > +#define AT91SAM9_SMC_READ_NRD_MODE 1 > +#define AT91SAM9_SMC_WRITE_MODE_MSK BIT(1) > +#define AT91SAM9_SMC_WRITE_NCS_MODE (0 << 1) > +#define AT91SAM9_SMC_WRITE_NWE_MODE (1 << 1) > +#define AT91SAM9_SMC_EXNW_MODE_MSK GENMASK(5, 4) > +#define AT91SAM9_SMC_EXNW_DIS (0 << 4) > +#define AT91SAM9_SMC_EXNW_FROZEN (2 << 4) > +#define AT91SAM9_SMC_EXNW_READY (3 << 4) > +#define AT91SAM9_SMC_BAT_MSK BIT(8) > +#define AT91SAM9_SMC_BAT_SELECT (0 << 8) > +#define AT91SAM9_SMC_BAT_WRITE (1 << 8) > +#define AT91SAM9_SMC_DBW_MSK GENMASK(13, 12) > +#define AT91SAM9_SMC_DBW(x) ((((x) / 16) & 0x3) << 12) > +#define AT91SAM9_SMC_TDF_CYCLES_MSK GENMASK(19, 16) > +#define AT91SAM9_SMC_TDF_CYCLES(x) (((x) & 0xf) << 16) > +#define AT91SAM9_SMC_TDF_MODE_MSK BIT(20) > +#define AT91SAM9_SMC_TDF_OPTIMIZED (1 << 20) > +#define AT91SAM9_SMC_PMEN BIT(24) > +#define AT91SAM9_SMC_PS(x) ((((x) / 4) & 0x3) << 28)
Those definitions are now also available in linux/mfd/syscon/atmel-smc.h.For consistency sake, this driver should probably use the new ones. BTW this patch should probably be applied after patch 3 "mfd: syscon: Add atmel-smc registers definition" and patch 1 "mfd: syscon: Add atmel-matrix registers definition" > + > +#define AT91_EBICSA_REGFIELD(soc) \ > + REG_FIELD(soc ## _MATRIX_EBICSA_OFF, 0, \ > + AT91_MATRIX_EBI_NUM_CS - 1) > + > +#define AT91_MULTI_EBICSA_REGFIELD(soc, n) \ > + REG_FIELD(soc ## _MATRIX_EBI ## n ## CSA_OFF, \ > + 0, AT91_MATRIX_EBI_NUM_CS - 1) > + > +struct at91sam9_smc_timings { > + u32 ncs_rd_setup_ns; > + u32 nrd_setup_ns; > + u32 ncs_wr_setup_ns; > + u32 nwe_setup_ns; > + u32 ncs_rd_pulse_ns; > + u32 nrd_pulse_ns; > + u32 ncs_wr_pulse_ns; > + u32 nwe_pulse_ns; > + u32 nrd_cycle_ns; > + u32 nwe_cycle_ns; > + u32 tdf_ns; > +}; > + > +struct at91sam9_smc_generic_fields { > + struct regmap_field *setup; > + struct regmap_field *pulse; > + struct regmap_field *cycle; > + struct regmap_field *mode; > +}; > + > +struct at91sam9_ebi_dev_config { > + struct at91sam9_smc_timings timings; > + u32 mode; > +}; > + > +struct at91_ebi; > + > +struct at91_ebi_dev { > + struct device_node *np; > + struct at91_smc_timings *timings; > + struct at91_ebi *ebi; > + u32 mode; > + int cs; > + void *config; > +}; > + > +struct at91_ebi_caps { > + unsigned int available_cs; > + const struct reg_field *ebi_csa; > + int (*xlate_config)(struct at91_ebi_dev *ebid); > + int (*apply_config)(struct at91_ebi_dev *ebid); > + int (*init)(struct at91_ebi *ebi); > +}; > + > +struct at91_ebi { > + struct clk *clk; > + struct regmap *smc; > + struct regmap *matrix; > + > + struct regmap_field *ebi_csa; > + > + struct device *dev; > + const struct at91_ebi_caps *caps; > + struct at91_ebi_dev *devs[AT91_MATRIX_EBI_NUM_CS]; > + void *priv; > +}; > + > +static u32 at91sam9_smc_setup_ns_to_cycles(unsigned int clk_rate, > + u32 timing_ns) > +{ > + u32 clk_period = DIV_ROUND_UP(NSEC_PER_SEC, clk_rate); > + u32 coded_cycles = 0; > + u32 cycles; > + > + cycles = DIV_ROUND_UP(timing_ns, clk_period); > + if (cycles / 32) { > + coded_cycles |= 1 << 5; > + if (cycles < 128) > + cycles = 0; > + } > + > + coded_cycles |= cycles % 32; > + > + return coded_cycles; > +} > + > +static u32 at91sam9_smc_pulse_ns_to_cycles(unsigned int clk_rate, > + u32 timing_ns) > +{ > + u32 clk_period = DIV_ROUND_UP(NSEC_PER_SEC, clk_rate); > + u32 coded_cycles = 0; > + u32 cycles; > + > + cycles = DIV_ROUND_UP(timing_ns, clk_period); > + if (cycles / 64) { > + coded_cycles |= 1 << 6; > + if (cycles < 256) > + cycles = 0; > + } > + > + coded_cycles |= cycles % 64; > + > + return coded_cycles; > +} > + > +static u32 at91sam9_smc_cycle_ns_to_cycles(unsigned int clk_rate, > + u32 timing_ns) > +{ > + u32 clk_period = DIV_ROUND_UP(NSEC_PER_SEC, clk_rate); > + u32 coded_cycles = 0; > + u32 cycles; > + > + cycles = DIV_ROUND_UP(timing_ns, clk_period); > + if (cycles / 128) { > + coded_cycles = cycles / 256; > + cycles %= 256; > + if (cycles >= 128) { > + coded_cycles++; > + cycles = 0; > + } > + > + if (coded_cycles > 0x3) { > + coded_cycles = 0x3; > + cycles = 0x7f; > + } > + > + coded_cycles <<= 7; > + } > + > + coded_cycles |= cycles % 128; > + > + return coded_cycles; > +} > + > +static int at91sam9_ebi_apply_config(struct at91_ebi_dev *ebid) > +{ > + unsigned int clk_rate = clk_get_rate(ebid->ebi->clk); > + struct at91sam9_ebi_dev_config *config = ebid->config; > + struct at91sam9_smc_timings *timings = &config->timings; > + struct at91sam9_smc_generic_fields *fields = ebid->ebi->priv; > + u32 val; > + > + val = at91sam9_smc_setup_ns_to_cycles(clk_rate, > + timings->ncs_rd_setup_ns) << 24; > + val |= at91sam9_smc_setup_ns_to_cycles(clk_rate, > + timings->nrd_setup_ns) << 16; > + val |= at91sam9_smc_setup_ns_to_cycles(clk_rate, > + timings->ncs_wr_setup_ns) << 8; > + val |= at91sam9_smc_setup_ns_to_cycles(clk_rate, > + timings->nwe_setup_ns); > + regmap_fields_write(fields->setup, ebid->cs, val); > + > + val = at91sam9_smc_pulse_ns_to_cycles(clk_rate, > + timings->ncs_rd_pulse_ns) << 24; > + val |= at91sam9_smc_pulse_ns_to_cycles(clk_rate, > + timings->nrd_pulse_ns) << 16; > + val |= at91sam9_smc_pulse_ns_to_cycles(clk_rate, > + timings->ncs_wr_pulse_ns) << 8; > + val |= at91sam9_smc_pulse_ns_to_cycles(clk_rate, > + timings->nwe_pulse_ns); > + regmap_fields_write(fields->pulse, ebid->cs, val); > + > + val = at91sam9_smc_cycle_ns_to_cycles(clk_rate, > + timings->nrd_cycle_ns) << 16; > + val |= at91sam9_smc_cycle_ns_to_cycles(clk_rate, > + timings->nwe_cycle_ns); > + regmap_fields_write(fields->cycle, ebid->cs, val); > + > + val = DIV_ROUND_UP(timings->tdf_ns, clk_rate); > + if (val > 16) > + val = 16; > + regmap_fields_write(fields->mode, ebid->cs, config->mode | val << 16); > + > + return 0; > +} > + > +static int at91sam9_smc_xslate_timings(struct at91_ebi_dev *ebid) > +{ > + struct at91sam9_ebi_dev_config *config = ebid->config; > + struct at91sam9_smc_timings *timings; > + struct device_node *np = ebid->np; > + > + timings = &config->timings; > + > + of_property_read_u32(np, "atmel,ncs-rd-setup-ns", > + &timings->ncs_rd_setup_ns); > + of_property_read_u32(np, "atmel,nrd-setup-ns", > + &timings->nrd_setup_ns); > + of_property_read_u32(np, "atmel,ncs-wr-setup-ns", > + &timings->ncs_wr_setup_ns); > + of_property_read_u32(np, "atmel,nwe-setup-ns", > + &timings->nwe_setup_ns); > + of_property_read_u32(np, "atmel,ncs-rd-pulse-ns", > + &timings->ncs_rd_pulse_ns); > + of_property_read_u32(np, "atmel,nrd-pulse-ns", > + &timings->nrd_pulse_ns); > + of_property_read_u32(np, "atmel,ncs-wr-pulse-ns", > + &timings->ncs_wr_pulse_ns); > + of_property_read_u32(np, "atmel,nwe-pulse-ns", > &timings->nwe_pulse_ns); > + of_property_read_u32(np, "atmel,nwe-cycle-ns", > &timings->nwe_cycle_ns); > + of_property_read_u32(np, "atmel,nrd-cycle-ns", > &timings->nrd_cycle_ns); > + of_property_read_u32(np, "atmel,tdf-ns", &timings->tdf_ns); > + > + return 0; > +} > + > +static int at91sam9_ebi_xslate_config(struct at91_ebi_dev *ebid) > +{ > + struct at91sam9_ebi_dev_config *config = ebid->config; > + struct device_node *np = ebid->np; > + const char *tmp_str; > + u32 tmp; > + int ret; > + > + config = devm_kzalloc(ebid->ebi->dev, sizeof(*config), GFP_KERNEL); > + if (!config) > + return -ENOMEM; > + > + ebid->config = config; > + > + ret = of_property_read_u32(np, "atmel,bus-width", &tmp); > + if (ret) > + return ret; > + > + if (tmp != 8 && tmp != 16 && tmp != 32) > + return -EINVAL; > + > + config->mode |= AT91SAM9_SMC_DBW(tmp); > + > + if (of_property_read_bool(np, "atmel,tdf-optimized")) > + config->mode |= AT91SAM9_SMC_TDF_OPTIMIZED; > + > + tmp_str = NULL; > + of_property_read_string(np, "atmel,byte-access-type", &tmp_str); > + if (tmp_str && !strcmp(tmp_str, "write")) > + config->mode |= AT91SAM9_SMC_BAT_WRITE; > + > + tmp_str = NULL; > + of_property_read_string(np, "atmel,read-mode", &tmp_str); > + if (tmp_str && !strcmp(tmp_str, "nrd")) > + config->mode |= AT91SAM9_SMC_READ_NRD_MODE; > + > + tmp_str = NULL; > + of_property_read_string(np, "atmel,write-mode", &tmp_str); > + if (tmp_str && !strcmp(tmp_str, "nwe")) > + config->mode |= AT91SAM9_SMC_WRITE_NWE_MODE; > + > + tmp_str = NULL; > + of_property_read_string(np, "atmel,exnw-mode", &tmp_str); > + if (tmp_str) { > + if (!strcmp(tmp_str, "frozen")) > + config->mode |= AT91SAM9_SMC_EXNW_FROZEN; > + else if (!strcmp(tmp_str, "ready")) > + config->mode |= AT91SAM9_SMC_EXNW_READY; > + } > + > + tmp = 0; > + of_property_read_u32(np, "atmel,page-mode", &tmp); > + if (tmp) > + config->mode |= AT91SAM9_SMC_PS(tmp) | AT91SAM9_SMC_PMEN; > + > + return at91sam9_smc_xslate_timings(ebid); > +} > + > +static int at91sam9_ebi_init(struct at91_ebi *ebi) > +{ > + struct at91sam9_smc_generic_fields *fields; > + struct reg_field field = REG_FIELD(0, 0, 31); > + > + fields = devm_kzalloc(ebi->dev, sizeof(*fields), GFP_KERNEL); > + if (!fields) > + return -ENOMEM; > + > + field.id_size = fls(ebi->caps->available_cs); > + field.id_offset = 0x10; > + > + field.reg = AT91SAM9_SMC_SETUP(AT91SAM9_SMC_GENERIC_OFFSET); > + fields->setup = devm_regmap_field_alloc(ebi->dev, ebi->smc, field); > + if (IS_ERR(fields->setup)) > + return PTR_ERR(fields->setup); > + > + field.reg = AT91SAM9_SMC_PULSE(AT91SAM9_SMC_GENERIC_OFFSET); > + fields->pulse = devm_regmap_field_alloc(ebi->dev, ebi->smc, field); > + if (IS_ERR(fields->pulse)) > + return PTR_ERR(fields->pulse); > + > + field.reg = AT91SAM9_SMC_CYCLE(AT91SAM9_SMC_GENERIC_OFFSET); > + fields->cycle = devm_regmap_field_alloc(ebi->dev, ebi->smc, field); > + if (IS_ERR(fields->cycle)) > + return PTR_ERR(fields->cycle); > + > + field.reg = AT91SAM9_SMC_MODE(AT91SAM9_SMC_GENERIC_OFFSET); > + fields->mode = devm_regmap_field_alloc(ebi->dev, ebi->smc, field); > + if (IS_ERR(fields->mode)) > + return PTR_ERR(fields->mode); > + > + ebi->priv = fields; > + > + return 0; > +} > + > +static int sama5d3_ebi_init(struct at91_ebi *ebi) > +{ > + struct at91sam9_smc_generic_fields *fields; > + struct reg_field field = REG_FIELD(0, 0, 31); > + > + fields = devm_kzalloc(ebi->dev, sizeof(*fields), GFP_KERNEL); > + if (!fields) > + return -ENOMEM; > + > + field.id_size = fls(ebi->caps->available_cs); > + field.id_offset = SAMA5_SMC_GENERIC_BLK_SZ; > + > + field.reg = AT91SAM9_SMC_SETUP(SAMA5_SMC_GENERIC_OFFSET); > + fields->setup = devm_regmap_field_alloc(ebi->dev, ebi->smc, field); > + if (IS_ERR(fields->setup)) > + return PTR_ERR(fields->setup); > + > + field.reg = AT91SAM9_SMC_PULSE(SAMA5_SMC_GENERIC_OFFSET); > + fields->pulse = devm_regmap_field_alloc(ebi->dev, ebi->smc, field); > + if (IS_ERR(fields->pulse)) > + return PTR_ERR(fields->pulse); > + > + field.reg = AT91SAM9_SMC_CYCLE(SAMA5_SMC_GENERIC_OFFSET); > + fields->cycle = devm_regmap_field_alloc(ebi->dev, ebi->smc, field); > + if (IS_ERR(fields->cycle)) > + return PTR_ERR(fields->cycle); > + > + field.reg = SAMA5_SMC_MODE(SAMA5_SMC_GENERIC_OFFSET); > + fields->mode = devm_regmap_field_alloc(ebi->dev, ebi->smc, field); > + if (IS_ERR(fields->mode)) > + return PTR_ERR(fields->mode); > + > + ebi->priv = fields; > + > + return 0; > +} > + > +static int at91_ebi_dev_setup(struct at91_ebi *ebi, struct device_node *np) > +{ > + struct device *dev = ebi->dev; > + struct device_node *dev_np; > + struct at91_ebi_dev *ebid; > + u32 tmp; > + int ret; > + > + dev_np = of_get_next_child(np, NULL); > + if (!dev_np) > + return -EINVAL; > + > + if (!of_device_is_available(dev_np)) > + return 0; > + > + ebid = devm_kzalloc(ebi->dev, sizeof(*ebid), GFP_KERNEL); > + if (!ebid) > + return -ENOMEM; > + > + ret = of_property_read_u32(dev_np, "reg" , &tmp); > + if (ret < 0) { > + dev_err(dev, "missing mandatory reg property\n"); > + return ret; > + } > + > + if (tmp > AT91_MATRIX_EBI_NUM_CS || > + !(BIT(tmp) & ebi->caps->available_cs)) { > + dev_err(dev, "invalid reg property\n"); > + return -EINVAL; > + } > + > + ebid->cs = tmp; > + ebid->np = np; > + ebid->ebi = ebi; > + > + if (!of_property_read_bool(np, "atmel,generic-dev")) > + goto populate; > + > + if (ebid->ebi->ebi_csa) > + regmap_field_update_bits(ebid->ebi->ebi_csa, > + BIT(ebid->cs), > + ~BIT(ebid->cs)); > + > + ret = ebid->ebi->caps->xlate_config(ebid); > + if (ret) > + return ret; > + > + ret = ebid->ebi->caps->apply_config(ebid); > + if (ret) > + return ret; > + ebi->devs[ebid->cs] = ebid; > + > +populate: > + return of_platform_populate(np, of_default_bus_match_table, NULL, > dev); > +} > + > +static const struct reg_field at91sam9260_ebi_csa = > + AT91_EBICSA_REGFIELD(AT91SAM9260); > + > +static const struct at91_ebi_caps at91sam9260_ebi_caps = { > + .available_cs = 0xff, > + .ebi_csa = &at91sam9260_ebi_csa, > + .xlate_config = at91sam9_ebi_xslate_config, > + .apply_config = at91sam9_ebi_apply_config, > + .init = at91sam9_ebi_init, > +}; > + > +static const struct reg_field at91sam9261_ebi_csa = > + AT91_EBICSA_REGFIELD(AT91SAM9261); > + > +static const struct at91_ebi_caps at91sam9261_ebi_caps = { > + .available_cs = 0xff, > + .ebi_csa = &at91sam9261_ebi_csa, > + .xlate_config = at91sam9_ebi_xslate_config, > + .apply_config = at91sam9_ebi_apply_config, > + .init = at91sam9_ebi_init, > +}; > + > +static const struct reg_field at91sam9263_ebi0_csa = > + AT91_MULTI_EBICSA_REGFIELD(AT91SAM9263, 0); > + > +static const struct at91_ebi_caps at91sam9263_ebi0_caps = { > + .available_cs = 0x3f, > + .ebi_csa = &at91sam9263_ebi0_csa, > + .xlate_config = at91sam9_ebi_xslate_config, > + .apply_config = at91sam9_ebi_apply_config, > + .init = at91sam9_ebi_init, > +}; > + > +static const struct reg_field at91sam9263_ebi1_csa = > + AT91_MULTI_EBICSA_REGFIELD(AT91SAM9263, 1); > + > +static const struct at91_ebi_caps at91sam9263_ebi1_caps = { > + .available_cs = 0x7, > + .ebi_csa = &at91sam9263_ebi1_csa, > + .xlate_config = at91sam9_ebi_xslate_config, > + .apply_config = at91sam9_ebi_apply_config, > + .init = at91sam9_ebi_init, > +}; > + > +static const struct reg_field at91sam9g45_ebi_csa = > + AT91_EBICSA_REGFIELD(AT91SAM9G45); > + > +static const struct at91_ebi_caps at91sam9g45_ebi_caps = { > + .available_cs = 0x3f, > + .ebi_csa = &at91sam9g45_ebi_csa, > + .xlate_config = at91sam9_ebi_xslate_config, > + .apply_config = at91sam9_ebi_apply_config, > + .init = at91sam9_ebi_init, > +}; > + > +static const struct at91_ebi_caps at91sam9x5_ebi_caps = { > + .available_cs = 0x3f, > + .ebi_csa = &at91sam9263_ebi0_csa, > + .xlate_config = at91sam9_ebi_xslate_config, > + .apply_config = at91sam9_ebi_apply_config, > + .init = at91sam9_ebi_init, > +}; > + > +static const struct at91_ebi_caps sama5d3_ebi_caps = { > + .available_cs = 0xf, > + .xlate_config = at91sam9_ebi_xslate_config, > + .apply_config = at91sam9_ebi_apply_config, > + .init = sama5d3_ebi_init, > +}; > + > +static const struct of_device_id at91_ebi_id_table[] = { > + { > + .compatible = "atmel,at91sam9260-ebi", > + .data = &at91sam9260_ebi_caps, > + }, > + { > + .compatible = "atmel,at91sam9261-ebi", > + .data = &at91sam9261_ebi_caps, > + }, > + { > + .compatible = "atmel,at91sam9263-ebi0", > + .data = &at91sam9263_ebi0_caps, > + }, > + { > + .compatible = "atmel,at91sam9263-ebi1", > + .data = &at91sam9263_ebi1_caps, > + }, > + { > + .compatible = "atmel,at91sam9g45-ebi", > + .data = &at91sam9g45_ebi_caps, > + }, > + { > + .compatible = "atmel,at91sam9x5-ebi", > + .data = &at91sam9x5_ebi_caps, > + }, > + { > + .compatible = "atmel,sama5d3-ebi", > + .data = &sama5d3_ebi_caps, > + }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, at91_ebi_id_table); > + > +static int at91_ebi_probe(struct platform_device *pdev) > +{ > + const struct of_device_id *match; > + struct device_node *child; > + struct device_node *np; > + struct at91_ebi *ebi; > + struct clk *clk; > + int ret; > + > + match = of_match_device(at91_ebi_id_table, &pdev->dev); > + if (!match || !match->data) > + return -EINVAL; > + > + ebi = devm_kzalloc(&pdev->dev, sizeof(*ebi), GFP_KERNEL); > + if (!ebi) > + return -ENOMEM; > + > + ebi->caps = match->data; > + ebi->dev = &pdev->dev; > + > + clk = devm_clk_get(&pdev->dev, NULL); > + if (IS_ERR(clk)) > + return PTR_ERR(clk); > + > + ebi->clk = clk; > + > + np = of_parse_phandle(pdev->dev.of_node, "atmel,smc", 0); > + if (!np) > + return -EINVAL; > + > + ebi->smc = syscon_node_to_regmap(np); > + if (IS_ERR(ebi->smc)) > + return PTR_ERR(ebi->smc); > + > + /* > + * The sama5d3 does not provide an EBICSA register and thus does need > + * to access the matrix registers. > + */ > + if (ebi->caps->ebi_csa) { > + np = of_parse_phandle(pdev->dev.of_node, "atmel,matrix", 0); > + if (np) > + return -EINVAL; > + > + ebi->matrix = syscon_node_to_regmap(np); > + if (IS_ERR(ebi->matrix)) > + return PTR_ERR(ebi->matrix); > + > + ebi->ebi_csa = regmap_field_alloc(ebi->matrix, > + *ebi->caps->ebi_csa); > + if (IS_ERR(ebi->ebi_csa)) > + return PTR_ERR(ebi->ebi_csa); > + } > + > + ret = ebi->caps->init(ebi); > + if (ret) > + return ret; > + > + for_each_child_of_node(pdev->dev.of_node, child) { > + ret = at91_ebi_dev_setup(ebi, child); > + if (ret) > + return ret; > + } > + > + return ret; > +} > + > +static struct platform_driver at91_ebi_driver = { > + .driver = { > + .name = "atmel-ebi", > + .of_match_table = at91_ebi_id_table, > + }, > +}; > +module_platform_driver_probe(at91_ebi_driver, at91_ebi_probe); > + > +MODULE_AUTHOR("JJ Hiblot"); > +MODULE_DESCRIPTION("Atmel's EBI driver"); > +MODULE_LICENSE("GPL"); > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/