/* * Static Memory Controller for AT32 chips * * Copyright (C) 2006 Atmel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/clk.h> #include <linux/err.h> #include <linux/init.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <asm/io.h> #include <mach/smc.h> #include "hsmc.h" #define NR_CHIP_SELECTS 6 struct hsmc { void __iomem *regs; struct clk *pclk; struct clk *mck; }; static struct hsmc *hsmc; void smc_set_timing(struct smc_config *config, const struct smc_timing *timing) { int recover; int cycle; unsigned long mul; /* Reset all SMC timings */ config->ncs_read_setup = 0; config->nrd_setup = 0; config->ncs_write_setup = 0; config->nwe_setup = 0; config->ncs_read_pulse = 0; config->nrd_pulse = 0; config->ncs_write_pulse = 0; config->nwe_pulse = 0; config->read_cycle = 0; config->write_cycle = 0; /* * cycles = x / T = x * f * = ((x * 1000000000) * ((f * 65536) / 1000000000)) / 65536 * = ((x * 1000000000) * (((f / 10000) * 65536) / 100000)) / 65536 */ mul = (clk_get_rate(hsmc->mck) / 10000) << 16; mul /= 100000; #define ns2cyc(x) ((((x) * mul) + 65535) >> 16) if (timing->ncs_read_setup > 0) config->ncs_read_setup = ns2cyc(timing->ncs_read_setup); if (timing->nrd_setup > 0) config->nrd_setup = ns2cyc(timing->nrd_setup); if (timing->ncs_write_setup > 0) config->ncs_write_setup = ns2cyc(timing->ncs_write_setup); if (timing->nwe_setup > 0) config->nwe_setup = ns2cyc(timing->nwe_setup); if (timing->ncs_read_pulse > 0) config->ncs_read_pulse = ns2cyc(timing->ncs_read_pulse); if (timing->nrd_pulse > 0) config->nrd_pulse = ns2cyc(timing->nrd_pulse); if (timing->ncs_write_pulse > 0) config->ncs_write_pulse = ns2cyc(timing->ncs_write_pulse); if (timing->nwe_pulse > 0) config->nwe_pulse = ns2cyc(timing->nwe_pulse); if (timing->read_cycle > 0) config->read_cycle = ns2cyc(timing->read_cycle); if (timing->write_cycle > 0) config->write_cycle = ns2cyc(timing->write_cycle); /* Extend read cycle in needed */ if (timing->ncs_read_recover > 0) recover = ns2cyc(timing->ncs_read_recover); else recover = 1; cycle = config->ncs_read_setup + config->ncs_read_pulse + recover; if (config->read_cycle < cycle) config->read_cycle = cycle; /* Extend read cycle in needed */ if (timing->nrd_recover > 0) recover = ns2cyc(timing->nrd_recover); else recover = 1; cycle = config->nrd_setup + config->nrd_pulse + recover; if (config->read_cycle < cycle) config->read_cycle = cycle; /* Extend write cycle in needed */ if (timing->ncs_write_recover > 0) recover = ns2cyc(timing->ncs_write_recover); else recover = 1; cycle = config->ncs_write_setup + config->ncs_write_pulse + recover; if (config->write_cycle < cycle) config->write_cycle = cycle; /* Extend write cycle in needed */ if (timing->nwe_recover > 0) recover = ns2cyc(timing->nwe_recover); else recover = 1; cycle = config->nwe_setup + config->nwe_pulse + recover; if (config->write_cycle < cycle) config->write_cycle = cycle; } EXPORT_SYMBOL(smc_set_timing); int smc_set_configuration(int cs, const struct smc_config *config) { unsigned long offset; u32 setup, pulse, cycle, mode; if (!hsmc) return -ENODEV; if (cs >= NR_CHIP_SELECTS) return -EINVAL; setup = (HSMC_BF(NWE_SETUP, config->nwe_setup) | HSMC_BF(NCS_WR_SETUP, config->ncs_write_setup) | HSMC_BF(NRD_SETUP, config->nrd_setup) | HSMC_BF(NCS_RD_SETUP, config->ncs_read_setup)); pulse = (HSMC_BF(NWE_PULSE, config->nwe_pulse) | HSMC_BF(NCS_WR_PULSE, config->ncs_write_pulse) | HSMC_BF(NRD_PULSE, config->nrd_pulse) | HSMC_BF(NCS_RD_PULSE, config->ncs_read_pulse)); cycle = (HSMC_BF(NWE_CYCLE, config->write_cycle) | HSMC_BF(NRD_CYCLE, config->read_cycle)); switch (config->bus_width) { case 1: mode = HSMC_BF(DBW, HSMC_DBW_8_BITS); break; case 2: mode = HSMC_BF(DBW, HSMC_DBW_16_BITS); break; case 4: mode = HSMC_BF(DBW, HSMC_DBW_32_BITS); break; default: return -EINVAL; } switch (config->nwait_mode) { case 0: mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_DISABLED); break; case 1: mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_RESERVED); break; case 2: mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_FROZEN); break; case 3: mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_READY); break; default: return -EINVAL; } if (config->tdf_cycles) { mode |= HSMC_BF(TDF_CYCLES, config->tdf_cycles); } if (config->nrd_controlled) mode |= HSMC_BIT(READ_MODE); if (config->nwe_controlled) mode |= HSMC_BIT(WRITE_MODE); if (config->byte_write) mode |= HSMC_BIT(BAT); if (config->tdf_mode) mode |= HSMC_BIT(TDF_MODE); pr_debug("smc cs%d: setup/%08x pulse/%08x cycle/%08x mode/%08x\n", cs, setup, pulse, cycle, mode); offset = cs * 0x10; hsmc_writel(hsmc, SETUP0 + offset, setup); hsmc_writel(hsmc, PULSE0 + offset, pulse); hsmc_writel(hsmc, CYCLE0 + offset, cycle); hsmc_writel(hsmc, MODE0 + offset, mode); hsmc_readl(hsmc, MODE0); /* I/O barrier */ return 0; } EXPORT_SYMBOL(smc_set_configuration); static int hsmc_probe(struct platform_device *pdev) { struct resource *regs; struct clk *pclk, *mck; int ret; if (hsmc) return -EBUSY; regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!regs) return -ENXIO; pclk = clk_get(&pdev->dev, "pclk"); if (IS_ERR(pclk)) return PTR_ERR(pclk); mck = clk_get(&pdev->dev, "mck"); if (IS_ERR(mck)) { ret = PTR_ERR(mck); goto out_put_pclk; } ret = -ENOMEM; hsmc = kzalloc(sizeof(struct hsmc), GFP_KERNEL); if (!hsmc) goto out_put_clocks; clk_enable(pclk); clk_enable(mck); hsmc->pclk = pclk; hsmc->mck = mck; hsmc->regs = ioremap(regs->start, regs->end - regs->start + 1); if (!hsmc->regs) goto out_disable_clocks; dev_info(&pdev->dev, "Atmel Static Memory Controller at 0x%08lx\n", (unsigned long)regs->start); platform_set_drvdata(pdev, hsmc); return 0; out_disable_clocks: clk_disable(mck); clk_disable(pclk); kfree(hsmc); out_put_clocks: clk_put(mck); out_put_pclk: clk_put(pclk); hsmc = NULL; return ret; } static struct platform_driver hsmc_driver = { .probe = hsmc_probe, .driver = { .name = "smc", }, }; static int __init hsmc_init(void) { return platform_driver_register(&hsmc_driver); } core_initcall(hsmc_init);