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635 lines
15 KiB
635 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* EBI driver for Atmel chips |
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* inspired by the fsl weim bus driver |
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* |
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* Copyright (C) 2013 Jean-Jacques Hiblot <[email protected]> |
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*/ |
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|
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/mfd/syscon/atmel-matrix.h> |
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#include <linux/mfd/syscon/atmel-smc.h> |
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#include <linux/init.h> |
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#include <linux/of_device.h> |
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#include <linux/regmap.h> |
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#include <soc/at91/atmel-sfr.h> |
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#define AT91_EBI_NUM_CS 8 |
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struct atmel_ebi_dev_config { |
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int cs; |
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struct atmel_smc_cs_conf smcconf; |
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}; |
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struct atmel_ebi; |
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struct atmel_ebi_dev { |
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struct list_head node; |
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struct atmel_ebi *ebi; |
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u32 mode; |
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int numcs; |
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struct atmel_ebi_dev_config configs[]; |
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}; |
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struct atmel_ebi_caps { |
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unsigned int available_cs; |
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unsigned int ebi_csa_offs; |
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const char *regmap_name; |
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void (*get_config)(struct atmel_ebi_dev *ebid, |
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struct atmel_ebi_dev_config *conf); |
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int (*xlate_config)(struct atmel_ebi_dev *ebid, |
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struct device_node *configs_np, |
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struct atmel_ebi_dev_config *conf); |
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void (*apply_config)(struct atmel_ebi_dev *ebid, |
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struct atmel_ebi_dev_config *conf); |
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}; |
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struct atmel_ebi { |
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struct clk *clk; |
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struct regmap *regmap; |
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struct { |
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struct regmap *regmap; |
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struct clk *clk; |
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const struct atmel_hsmc_reg_layout *layout; |
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} smc; |
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struct device *dev; |
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const struct atmel_ebi_caps *caps; |
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struct list_head devs; |
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}; |
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struct atmel_smc_timing_xlate { |
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const char *name; |
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int (*converter)(struct atmel_smc_cs_conf *conf, |
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unsigned int shift, unsigned int nycles); |
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unsigned int shift; |
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}; |
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#define ATMEL_SMC_SETUP_XLATE(nm, pos) \ |
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{ .name = nm, .converter = atmel_smc_cs_conf_set_setup, .shift = pos} |
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#define ATMEL_SMC_PULSE_XLATE(nm, pos) \ |
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{ .name = nm, .converter = atmel_smc_cs_conf_set_pulse, .shift = pos} |
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#define ATMEL_SMC_CYCLE_XLATE(nm, pos) \ |
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{ .name = nm, .converter = atmel_smc_cs_conf_set_cycle, .shift = pos} |
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static void at91sam9_ebi_get_config(struct atmel_ebi_dev *ebid, |
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struct atmel_ebi_dev_config *conf) |
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{ |
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atmel_smc_cs_conf_get(ebid->ebi->smc.regmap, conf->cs, |
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&conf->smcconf); |
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} |
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static void sama5_ebi_get_config(struct atmel_ebi_dev *ebid, |
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struct atmel_ebi_dev_config *conf) |
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{ |
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atmel_hsmc_cs_conf_get(ebid->ebi->smc.regmap, ebid->ebi->smc.layout, |
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conf->cs, &conf->smcconf); |
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} |
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static const struct atmel_smc_timing_xlate timings_xlate_table[] = { |
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ATMEL_SMC_SETUP_XLATE("atmel,smc-ncs-rd-setup-ns", |
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ATMEL_SMC_NCS_RD_SHIFT), |
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ATMEL_SMC_SETUP_XLATE("atmel,smc-ncs-wr-setup-ns", |
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ATMEL_SMC_NCS_WR_SHIFT), |
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ATMEL_SMC_SETUP_XLATE("atmel,smc-nrd-setup-ns", ATMEL_SMC_NRD_SHIFT), |
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ATMEL_SMC_SETUP_XLATE("atmel,smc-nwe-setup-ns", ATMEL_SMC_NWE_SHIFT), |
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ATMEL_SMC_PULSE_XLATE("atmel,smc-ncs-rd-pulse-ns", |
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ATMEL_SMC_NCS_RD_SHIFT), |
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ATMEL_SMC_PULSE_XLATE("atmel,smc-ncs-wr-pulse-ns", |
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ATMEL_SMC_NCS_WR_SHIFT), |
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ATMEL_SMC_PULSE_XLATE("atmel,smc-nrd-pulse-ns", ATMEL_SMC_NRD_SHIFT), |
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ATMEL_SMC_PULSE_XLATE("atmel,smc-nwe-pulse-ns", ATMEL_SMC_NWE_SHIFT), |
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ATMEL_SMC_CYCLE_XLATE("atmel,smc-nrd-cycle-ns", ATMEL_SMC_NRD_SHIFT), |
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ATMEL_SMC_CYCLE_XLATE("atmel,smc-nwe-cycle-ns", ATMEL_SMC_NWE_SHIFT), |
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}; |
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static int atmel_ebi_xslate_smc_timings(struct atmel_ebi_dev *ebid, |
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struct device_node *np, |
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struct atmel_smc_cs_conf *smcconf) |
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{ |
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unsigned int clk_rate = clk_get_rate(ebid->ebi->clk); |
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unsigned int clk_period_ns = NSEC_PER_SEC / clk_rate; |
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bool required = false; |
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unsigned int ncycles; |
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int ret, i; |
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u32 val; |
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ret = of_property_read_u32(np, "atmel,smc-tdf-ns", &val); |
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if (!ret) { |
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required = true; |
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ncycles = DIV_ROUND_UP(val, clk_period_ns); |
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if (ncycles > ATMEL_SMC_MODE_TDF_MAX) { |
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ret = -EINVAL; |
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goto out; |
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} |
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if (ncycles < ATMEL_SMC_MODE_TDF_MIN) |
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ncycles = ATMEL_SMC_MODE_TDF_MIN; |
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smcconf->mode |= ATMEL_SMC_MODE_TDF(ncycles); |
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} |
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for (i = 0; i < ARRAY_SIZE(timings_xlate_table); i++) { |
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const struct atmel_smc_timing_xlate *xlate; |
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xlate = &timings_xlate_table[i]; |
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ret = of_property_read_u32(np, xlate->name, &val); |
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if (ret) { |
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if (!required) |
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continue; |
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else |
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break; |
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} |
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if (!required) { |
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ret = -EINVAL; |
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break; |
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} |
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ncycles = DIV_ROUND_UP(val, clk_period_ns); |
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ret = xlate->converter(smcconf, xlate->shift, ncycles); |
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if (ret) |
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goto out; |
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} |
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out: |
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if (ret) { |
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dev_err(ebid->ebi->dev, |
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"missing or invalid timings definition in %pOF", |
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np); |
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return ret; |
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} |
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return required; |
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} |
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static int atmel_ebi_xslate_smc_config(struct atmel_ebi_dev *ebid, |
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struct device_node *np, |
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struct atmel_ebi_dev_config *conf) |
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{ |
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struct atmel_smc_cs_conf *smcconf = &conf->smcconf; |
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bool required = false; |
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const char *tmp_str; |
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u32 tmp; |
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int ret; |
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ret = of_property_read_u32(np, "atmel,smc-bus-width", &tmp); |
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if (!ret) { |
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switch (tmp) { |
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case 8: |
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smcconf->mode |= ATMEL_SMC_MODE_DBW_8; |
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break; |
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case 16: |
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smcconf->mode |= ATMEL_SMC_MODE_DBW_16; |
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break; |
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case 32: |
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smcconf->mode |= ATMEL_SMC_MODE_DBW_32; |
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break; |
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default: |
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return -EINVAL; |
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} |
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required = true; |
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} |
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if (of_property_read_bool(np, "atmel,smc-tdf-optimized")) { |
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smcconf->mode |= ATMEL_SMC_MODE_TDFMODE_OPTIMIZED; |
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required = true; |
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} |
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tmp_str = NULL; |
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of_property_read_string(np, "atmel,smc-byte-access-type", &tmp_str); |
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if (tmp_str && !strcmp(tmp_str, "write")) { |
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smcconf->mode |= ATMEL_SMC_MODE_BAT_WRITE; |
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required = true; |
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} |
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tmp_str = NULL; |
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of_property_read_string(np, "atmel,smc-read-mode", &tmp_str); |
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if (tmp_str && !strcmp(tmp_str, "nrd")) { |
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smcconf->mode |= ATMEL_SMC_MODE_READMODE_NRD; |
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required = true; |
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} |
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tmp_str = NULL; |
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of_property_read_string(np, "atmel,smc-write-mode", &tmp_str); |
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if (tmp_str && !strcmp(tmp_str, "nwe")) { |
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smcconf->mode |= ATMEL_SMC_MODE_WRITEMODE_NWE; |
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required = true; |
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} |
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tmp_str = NULL; |
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of_property_read_string(np, "atmel,smc-exnw-mode", &tmp_str); |
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if (tmp_str) { |
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if (!strcmp(tmp_str, "frozen")) |
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smcconf->mode |= ATMEL_SMC_MODE_EXNWMODE_FROZEN; |
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else if (!strcmp(tmp_str, "ready")) |
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smcconf->mode |= ATMEL_SMC_MODE_EXNWMODE_READY; |
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else if (strcmp(tmp_str, "disabled")) |
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return -EINVAL; |
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required = true; |
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} |
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ret = of_property_read_u32(np, "atmel,smc-page-mode", &tmp); |
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if (!ret) { |
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switch (tmp) { |
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case 4: |
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smcconf->mode |= ATMEL_SMC_MODE_PS_4; |
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break; |
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case 8: |
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smcconf->mode |= ATMEL_SMC_MODE_PS_8; |
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break; |
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case 16: |
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smcconf->mode |= ATMEL_SMC_MODE_PS_16; |
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break; |
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case 32: |
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smcconf->mode |= ATMEL_SMC_MODE_PS_32; |
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break; |
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default: |
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return -EINVAL; |
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} |
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smcconf->mode |= ATMEL_SMC_MODE_PMEN; |
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required = true; |
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} |
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ret = atmel_ebi_xslate_smc_timings(ebid, np, &conf->smcconf); |
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if (ret < 0) |
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return -EINVAL; |
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if ((ret > 0 && !required) || (!ret && required)) { |
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dev_err(ebid->ebi->dev, "missing atmel,smc- properties in %pOF", |
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np); |
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return -EINVAL; |
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} |
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return required; |
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} |
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static void at91sam9_ebi_apply_config(struct atmel_ebi_dev *ebid, |
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struct atmel_ebi_dev_config *conf) |
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{ |
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atmel_smc_cs_conf_apply(ebid->ebi->smc.regmap, conf->cs, |
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&conf->smcconf); |
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} |
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static void sama5_ebi_apply_config(struct atmel_ebi_dev *ebid, |
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struct atmel_ebi_dev_config *conf) |
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{ |
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atmel_hsmc_cs_conf_apply(ebid->ebi->smc.regmap, ebid->ebi->smc.layout, |
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conf->cs, &conf->smcconf); |
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} |
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static int atmel_ebi_dev_setup(struct atmel_ebi *ebi, struct device_node *np, |
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int reg_cells) |
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{ |
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const struct atmel_ebi_caps *caps = ebi->caps; |
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struct atmel_ebi_dev_config conf = { }; |
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struct device *dev = ebi->dev; |
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struct atmel_ebi_dev *ebid; |
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unsigned long cslines = 0; |
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int ret, numcs = 0, nentries, i; |
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bool apply = false; |
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u32 cs; |
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nentries = of_property_count_elems_of_size(np, "reg", |
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reg_cells * sizeof(u32)); |
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for (i = 0; i < nentries; i++) { |
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ret = of_property_read_u32_index(np, "reg", i * reg_cells, |
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&cs); |
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if (ret) |
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return ret; |
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if (cs >= AT91_EBI_NUM_CS || |
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!(ebi->caps->available_cs & BIT(cs))) { |
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dev_err(dev, "invalid reg property in %pOF\n", np); |
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return -EINVAL; |
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} |
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if (!test_and_set_bit(cs, &cslines)) |
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numcs++; |
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} |
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if (!numcs) { |
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dev_err(dev, "invalid reg property in %pOF\n", np); |
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return -EINVAL; |
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} |
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ebid = devm_kzalloc(ebi->dev, struct_size(ebid, configs, numcs), |
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GFP_KERNEL); |
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if (!ebid) |
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return -ENOMEM; |
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ebid->ebi = ebi; |
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ebid->numcs = numcs; |
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ret = caps->xlate_config(ebid, np, &conf); |
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if (ret < 0) |
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return ret; |
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else if (ret) |
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apply = true; |
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i = 0; |
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for_each_set_bit(cs, &cslines, AT91_EBI_NUM_CS) { |
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ebid->configs[i].cs = cs; |
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if (apply) { |
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conf.cs = cs; |
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caps->apply_config(ebid, &conf); |
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} |
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caps->get_config(ebid, &ebid->configs[i]); |
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/* |
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* Attach the EBI device to the generic SMC logic if at least |
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* one "atmel,smc-" property is present. |
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*/ |
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if (ebi->caps->ebi_csa_offs && apply) |
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regmap_update_bits(ebi->regmap, |
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ebi->caps->ebi_csa_offs, |
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BIT(cs), 0); |
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i++; |
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} |
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list_add_tail(&ebid->node, &ebi->devs); |
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return 0; |
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} |
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static const struct atmel_ebi_caps at91sam9260_ebi_caps = { |
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.available_cs = 0xff, |
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.ebi_csa_offs = AT91SAM9260_MATRIX_EBICSA, |
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.regmap_name = "atmel,matrix", |
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.get_config = at91sam9_ebi_get_config, |
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.xlate_config = atmel_ebi_xslate_smc_config, |
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.apply_config = at91sam9_ebi_apply_config, |
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}; |
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static const struct atmel_ebi_caps at91sam9261_ebi_caps = { |
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.available_cs = 0xff, |
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.ebi_csa_offs = AT91SAM9261_MATRIX_EBICSA, |
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.regmap_name = "atmel,matrix", |
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.get_config = at91sam9_ebi_get_config, |
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.xlate_config = atmel_ebi_xslate_smc_config, |
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.apply_config = at91sam9_ebi_apply_config, |
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}; |
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static const struct atmel_ebi_caps at91sam9263_ebi0_caps = { |
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.available_cs = 0x3f, |
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.ebi_csa_offs = AT91SAM9263_MATRIX_EBI0CSA, |
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.regmap_name = "atmel,matrix", |
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.get_config = at91sam9_ebi_get_config, |
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.xlate_config = atmel_ebi_xslate_smc_config, |
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.apply_config = at91sam9_ebi_apply_config, |
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}; |
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static const struct atmel_ebi_caps at91sam9263_ebi1_caps = { |
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.available_cs = 0x7, |
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.ebi_csa_offs = AT91SAM9263_MATRIX_EBI1CSA, |
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.regmap_name = "atmel,matrix", |
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.get_config = at91sam9_ebi_get_config, |
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.xlate_config = atmel_ebi_xslate_smc_config, |
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.apply_config = at91sam9_ebi_apply_config, |
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}; |
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static const struct atmel_ebi_caps at91sam9rl_ebi_caps = { |
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.available_cs = 0x3f, |
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.ebi_csa_offs = AT91SAM9RL_MATRIX_EBICSA, |
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.regmap_name = "atmel,matrix", |
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.get_config = at91sam9_ebi_get_config, |
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.xlate_config = atmel_ebi_xslate_smc_config, |
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.apply_config = at91sam9_ebi_apply_config, |
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}; |
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static const struct atmel_ebi_caps at91sam9g45_ebi_caps = { |
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.available_cs = 0x3f, |
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.ebi_csa_offs = AT91SAM9G45_MATRIX_EBICSA, |
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.regmap_name = "atmel,matrix", |
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.get_config = at91sam9_ebi_get_config, |
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.xlate_config = atmel_ebi_xslate_smc_config, |
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.apply_config = at91sam9_ebi_apply_config, |
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}; |
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static const struct atmel_ebi_caps at91sam9x5_ebi_caps = { |
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.available_cs = 0x3f, |
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.ebi_csa_offs = AT91SAM9X5_MATRIX_EBICSA, |
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.regmap_name = "atmel,matrix", |
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.get_config = at91sam9_ebi_get_config, |
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.xlate_config = atmel_ebi_xslate_smc_config, |
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.apply_config = at91sam9_ebi_apply_config, |
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}; |
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static const struct atmel_ebi_caps sama5d3_ebi_caps = { |
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.available_cs = 0xf, |
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.get_config = sama5_ebi_get_config, |
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.xlate_config = atmel_ebi_xslate_smc_config, |
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.apply_config = sama5_ebi_apply_config, |
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}; |
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static const struct atmel_ebi_caps sam9x60_ebi_caps = { |
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.available_cs = 0x3f, |
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.ebi_csa_offs = AT91_SFR_CCFG_EBICSA, |
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.regmap_name = "microchip,sfr", |
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.get_config = at91sam9_ebi_get_config, |
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.xlate_config = atmel_ebi_xslate_smc_config, |
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.apply_config = at91sam9_ebi_apply_config, |
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}; |
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static const struct of_device_id atmel_ebi_id_table[] = { |
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{ |
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.compatible = "atmel,at91sam9260-ebi", |
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.data = &at91sam9260_ebi_caps, |
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}, |
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{ |
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.compatible = "atmel,at91sam9261-ebi", |
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.data = &at91sam9261_ebi_caps, |
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}, |
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{ |
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.compatible = "atmel,at91sam9263-ebi0", |
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.data = &at91sam9263_ebi0_caps, |
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}, |
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{ |
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.compatible = "atmel,at91sam9263-ebi1", |
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.data = &at91sam9263_ebi1_caps, |
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}, |
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{ |
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.compatible = "atmel,at91sam9rl-ebi", |
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.data = &at91sam9rl_ebi_caps, |
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}, |
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{ |
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.compatible = "atmel,at91sam9g45-ebi", |
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.data = &at91sam9g45_ebi_caps, |
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}, |
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{ |
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.compatible = "atmel,at91sam9x5-ebi", |
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.data = &at91sam9x5_ebi_caps, |
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}, |
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{ |
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.compatible = "atmel,sama5d3-ebi", |
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.data = &sama5d3_ebi_caps, |
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}, |
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{ |
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.compatible = "microchip,sam9x60-ebi", |
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.data = &sam9x60_ebi_caps, |
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}, |
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{ /* sentinel */ } |
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}; |
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static int atmel_ebi_dev_disable(struct atmel_ebi *ebi, struct device_node *np) |
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{ |
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struct device *dev = ebi->dev; |
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struct property *newprop; |
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newprop = devm_kzalloc(dev, sizeof(*newprop), GFP_KERNEL); |
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if (!newprop) |
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return -ENOMEM; |
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newprop->name = devm_kstrdup(dev, "status", GFP_KERNEL); |
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if (!newprop->name) |
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return -ENOMEM; |
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newprop->value = devm_kstrdup(dev, "disabled", GFP_KERNEL); |
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if (!newprop->value) |
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return -ENOMEM; |
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newprop->length = sizeof("disabled"); |
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|
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return of_update_property(np, newprop); |
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} |
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|
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static int atmel_ebi_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct device_node *child, *np = dev->of_node, *smc_np; |
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const struct of_device_id *match; |
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struct atmel_ebi *ebi; |
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int ret, reg_cells; |
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struct clk *clk; |
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u32 val; |
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|
|
match = of_match_device(atmel_ebi_id_table, dev); |
|
if (!match || !match->data) |
|
return -EINVAL; |
|
|
|
ebi = devm_kzalloc(dev, sizeof(*ebi), GFP_KERNEL); |
|
if (!ebi) |
|
return -ENOMEM; |
|
|
|
platform_set_drvdata(pdev, ebi); |
|
|
|
INIT_LIST_HEAD(&ebi->devs); |
|
ebi->caps = match->data; |
|
ebi->dev = dev; |
|
|
|
clk = devm_clk_get(dev, NULL); |
|
if (IS_ERR(clk)) |
|
return PTR_ERR(clk); |
|
|
|
ebi->clk = clk; |
|
|
|
smc_np = of_parse_phandle(dev->of_node, "atmel,smc", 0); |
|
|
|
ebi->smc.regmap = syscon_node_to_regmap(smc_np); |
|
if (IS_ERR(ebi->smc.regmap)) |
|
return PTR_ERR(ebi->smc.regmap); |
|
|
|
ebi->smc.layout = atmel_hsmc_get_reg_layout(smc_np); |
|
if (IS_ERR(ebi->smc.layout)) |
|
return PTR_ERR(ebi->smc.layout); |
|
|
|
ebi->smc.clk = of_clk_get(smc_np, 0); |
|
if (IS_ERR(ebi->smc.clk)) { |
|
if (PTR_ERR(ebi->smc.clk) != -ENOENT) |
|
return PTR_ERR(ebi->smc.clk); |
|
|
|
ebi->smc.clk = NULL; |
|
} |
|
ret = clk_prepare_enable(ebi->smc.clk); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* The sama5d3 does not provide an EBICSA register and thus does need |
|
* to access it. |
|
*/ |
|
if (ebi->caps->ebi_csa_offs) { |
|
ebi->regmap = |
|
syscon_regmap_lookup_by_phandle(np, |
|
ebi->caps->regmap_name); |
|
if (IS_ERR(ebi->regmap)) |
|
return PTR_ERR(ebi->regmap); |
|
} |
|
|
|
ret = of_property_read_u32(np, "#address-cells", &val); |
|
if (ret) { |
|
dev_err(dev, "missing #address-cells property\n"); |
|
return ret; |
|
} |
|
|
|
reg_cells = val; |
|
|
|
ret = of_property_read_u32(np, "#size-cells", &val); |
|
if (ret) { |
|
dev_err(dev, "missing #address-cells property\n"); |
|
return ret; |
|
} |
|
|
|
reg_cells += val; |
|
|
|
for_each_available_child_of_node(np, child) { |
|
if (!of_find_property(child, "reg", NULL)) |
|
continue; |
|
|
|
ret = atmel_ebi_dev_setup(ebi, child, reg_cells); |
|
if (ret) { |
|
dev_err(dev, "failed to configure EBI bus for %pOF, disabling the device", |
|
child); |
|
|
|
ret = atmel_ebi_dev_disable(ebi, child); |
|
if (ret) |
|
return ret; |
|
} |
|
} |
|
|
|
return of_platform_populate(np, NULL, NULL, dev); |
|
} |
|
|
|
static __maybe_unused int atmel_ebi_resume(struct device *dev) |
|
{ |
|
struct atmel_ebi *ebi = dev_get_drvdata(dev); |
|
struct atmel_ebi_dev *ebid; |
|
|
|
list_for_each_entry(ebid, &ebi->devs, node) { |
|
int i; |
|
|
|
for (i = 0; i < ebid->numcs; i++) |
|
ebid->ebi->caps->apply_config(ebid, &ebid->configs[i]); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(atmel_ebi_pm_ops, NULL, atmel_ebi_resume); |
|
|
|
static struct platform_driver atmel_ebi_driver = { |
|
.driver = { |
|
.name = "atmel-ebi", |
|
.of_match_table = atmel_ebi_id_table, |
|
.pm = &atmel_ebi_pm_ops, |
|
}, |
|
}; |
|
builtin_platform_driver_probe(atmel_ebi_driver, atmel_ebi_probe);
|
|
|