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author | Ladislav Michl <ladis@linux-mips.org> | 2018-01-12 14:17:25 +0100 |
---|---|---|
committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2018-01-12 16:41:15 +0100 |
commit | a758f50f10cfcf863f95372ff52e0d8d22fda9ba (patch) | |
tree | 294a2badeec6d690b68db82d8dbd29637c6edec7 /drivers/mtd | |
parent | bdaca9345d41fd9420995469d27603ea62054691 (diff) | |
download | linux-a758f50f10cfcf863f95372ff52e0d8d22fda9ba.tar.gz linux-a758f50f10cfcf863f95372ff52e0d8d22fda9ba.tar.bz2 linux-a758f50f10cfcf863f95372ff52e0d8d22fda9ba.zip |
mtd: onenand: omap2: Configure driver from DT
Move away from platform data configuration and use pure DT approach.
Use generic probe function to deal with OneNAND node and remove now useless
gpmc_probe_onenand_child function. Import sync mode timing calculation
function from mach-omap2/gpmc-onenand.c
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r-- | drivers/mtd/onenand/Kconfig | 4 | ||||
-rw-r--r-- | drivers/mtd/onenand/omap2.c | 250 |
2 files changed, 156 insertions, 98 deletions
diff --git a/drivers/mtd/onenand/Kconfig b/drivers/mtd/onenand/Kconfig index aaeb30458139..9dc15748947b 100644 --- a/drivers/mtd/onenand/Kconfig +++ b/drivers/mtd/onenand/Kconfig @@ -25,9 +25,11 @@ config MTD_ONENAND_GENERIC config MTD_ONENAND_OMAP2 tristate "OneNAND on OMAP2/OMAP3 support" depends on ARCH_OMAP2 || ARCH_OMAP3 + depends on OF || COMPILE_TEST help - Support for a OneNAND flash device connected to an OMAP2/OMAP3 CPU + Support for a OneNAND flash device connected to an OMAP2/OMAP3 SoC via the GPMC memory controller. + Enable dmaengine and gpiolib for better performance. config MTD_ONENAND_SAMSUNG tristate "OneNAND on Samsung SOC controller support" diff --git a/drivers/mtd/onenand/omap2.c b/drivers/mtd/onenand/omap2.c index 1cd78a076759..2ce73fb6da1c 100644 --- a/drivers/mtd/onenand/omap2.c +++ b/drivers/mtd/onenand/omap2.c @@ -28,6 +28,8 @@ #include <linux/mtd/mtd.h> #include <linux/mtd/onenand.h> #include <linux/mtd/partitions.h> +#include <linux/of_device.h> +#include <linux/omap-gpmc.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/delay.h> @@ -35,10 +37,9 @@ #include <linux/dmaengine.h> #include <linux/io.h> #include <linux/slab.h> -#include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <asm/mach/flash.h> -#include <linux/platform_data/mtd-onenand-omap2.h> #define DRIVER_NAME "omap2-onenand" @@ -48,15 +49,12 @@ struct omap2_onenand { struct platform_device *pdev; int gpmc_cs; unsigned long phys_base; - unsigned int mem_size; - int gpio_irq; + struct gpio_desc *int_gpiod; struct mtd_info mtd; struct onenand_chip onenand; struct completion irq_done; struct completion dma_done; struct dma_chan *dma_chan; - int freq; - int (*setup)(void __iomem *base, int *freq_ptr); }; static void omap2_onenand_dma_complete_func(void *completion) @@ -84,6 +82,65 @@ static inline void write_reg(struct omap2_onenand *c, unsigned short value, writew(value, c->onenand.base + reg); } +static int omap2_onenand_set_cfg(struct omap2_onenand *c, + bool sr, bool sw, + int latency, int burst_len) +{ + unsigned short reg = ONENAND_SYS_CFG1_RDY | ONENAND_SYS_CFG1_INT; + + reg |= latency << ONENAND_SYS_CFG1_BRL_SHIFT; + + switch (burst_len) { + case 0: /* continuous */ + break; + case 4: + reg |= ONENAND_SYS_CFG1_BL_4; + break; + case 8: + reg |= ONENAND_SYS_CFG1_BL_8; + break; + case 16: + reg |= ONENAND_SYS_CFG1_BL_16; + break; + case 32: + reg |= ONENAND_SYS_CFG1_BL_32; + break; + default: + return -EINVAL; + } + + if (latency > 5) + reg |= ONENAND_SYS_CFG1_HF; + if (latency > 7) + reg |= ONENAND_SYS_CFG1_VHF; + if (sr) + reg |= ONENAND_SYS_CFG1_SYNC_READ; + if (sw) + reg |= ONENAND_SYS_CFG1_SYNC_WRITE; + + write_reg(c, reg, ONENAND_REG_SYS_CFG1); + + return 0; +} + +static int omap2_onenand_get_freq(int ver) +{ + switch ((ver >> 4) & 0xf) { + case 0: + return 40; + case 1: + return 54; + case 2: + return 66; + case 3: + return 83; + case 4: + return 104; + } + + return -EINVAL; +} + static void wait_err(char *msg, int state, unsigned int ctrl, unsigned int intr) { printk(KERN_ERR "onenand_wait: %s! state %d ctrl 0x%04x intr 0x%04x\n", @@ -152,12 +209,12 @@ static int omap2_onenand_wait(struct mtd_info *mtd, int state) } reinit_completion(&c->irq_done); - result = gpio_get_value(c->gpio_irq); + result = gpiod_get_value(c->int_gpiod); if (result < 0) { ctrl = read_reg(c, ONENAND_REG_CTRL_STATUS); intr = read_reg(c, ONENAND_REG_INTERRUPT); wait_err("gpio error", state, ctrl, intr); - return -EIO; + return result; } else if (result == 0) { int retry_cnt = 0; retry: @@ -431,8 +488,6 @@ out_copy: return 0; } -static struct platform_driver omap2_onenand_driver; - static void omap2_onenand_shutdown(struct platform_device *pdev) { struct omap2_onenand *c = dev_get_drvdata(&pdev->dev); @@ -446,105 +501,117 @@ static void omap2_onenand_shutdown(struct platform_device *pdev) static int omap2_onenand_probe(struct platform_device *pdev) { + u32 val; dma_cap_mask_t mask; - struct omap_onenand_platform_data *pdata; - struct omap2_onenand *c; - struct onenand_chip *this; - int r; + int freq, latency, r; struct resource *res; + struct omap2_onenand *c; + struct gpmc_onenand_info info; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "error getting memory resource\n"); + return -EINVAL; + } - pdata = dev_get_platdata(&pdev->dev); - if (pdata == NULL) { - dev_err(&pdev->dev, "platform data missing\n"); - return -ENODEV; + r = of_property_read_u32(np, "reg", &val); + if (r) { + dev_err(dev, "reg not found in DT\n"); + return r; } - c = kzalloc(sizeof(struct omap2_onenand), GFP_KERNEL); + c = devm_kzalloc(dev, sizeof(struct omap2_onenand), GFP_KERNEL); if (!c) return -ENOMEM; init_completion(&c->irq_done); init_completion(&c->dma_done); - c->gpmc_cs = pdata->cs; - c->gpio_irq = pdata->gpio_irq; - if (pdata->dma_channel < 0) { - /* if -1, don't use DMA */ - c->gpio_irq = 0; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res == NULL) { - r = -EINVAL; - dev_err(&pdev->dev, "error getting memory resource\n"); - goto err_kfree; - } - + c->gpmc_cs = val; c->phys_base = res->start; - c->mem_size = resource_size(res); - - if (request_mem_region(c->phys_base, c->mem_size, - pdev->dev.driver->name) == NULL) { - dev_err(&pdev->dev, "Cannot reserve memory region at 0x%08lx, size: 0x%x\n", - c->phys_base, c->mem_size); - r = -EBUSY; - goto err_kfree; - } - c->onenand.base = ioremap(c->phys_base, c->mem_size); - if (c->onenand.base == NULL) { - r = -ENOMEM; - goto err_release_mem_region; - } - if (pdata->onenand_setup != NULL) { - r = pdata->onenand_setup(c->onenand.base, &c->freq); - if (r < 0) { - dev_err(&pdev->dev, "Onenand platform setup failed: " - "%d\n", r); - goto err_iounmap; - } - c->setup = pdata->onenand_setup; + c->onenand.base = devm_ioremap_resource(dev, res); + if (IS_ERR(c->onenand.base)) { + dev_err(dev, "Cannot reserve memory region at 0x%08x, size: 0x%x\n", + res->start, resource_size(res)); + return PTR_ERR(c->onenand.base); } - if (c->gpio_irq) { - if ((r = gpio_request(c->gpio_irq, "OneNAND irq")) < 0) { - dev_err(&pdev->dev, "Failed to request GPIO%d for " - "OneNAND\n", c->gpio_irq); - goto err_iounmap; - } - gpio_direction_input(c->gpio_irq); + c->int_gpiod = devm_gpiod_get_optional(dev, "int", GPIOD_IN); + if (IS_ERR(c->int_gpiod)) { + r = PTR_ERR(c->int_gpiod); + /* Just try again if this happens */ + if (r != -EPROBE_DEFER) + dev_err(dev, "error getting gpio: %d\n", r); + return r; + } - if ((r = request_irq(gpio_to_irq(c->gpio_irq), - omap2_onenand_interrupt, IRQF_TRIGGER_RISING, - pdev->dev.driver->name, c)) < 0) - goto err_release_gpio; + if (c->int_gpiod) { + r = devm_request_irq(dev, gpiod_to_irq(c->int_gpiod), + omap2_onenand_interrupt, + IRQF_TRIGGER_RISING, "onenand", c); + if (r) + return r; - this->wait = omap2_onenand_wait; + c->onenand.wait = omap2_onenand_wait; } dma_cap_zero(mask); dma_cap_set(DMA_MEMCPY, mask); c->dma_chan = dma_request_channel(mask, NULL, NULL); - - dev_info(&pdev->dev, "initializing on CS%d, phys base 0x%08lx, virtual " - "base %p, freq %d MHz, %s mode\n", c->gpmc_cs, c->phys_base, - c->onenand.base, c->freq, c->dma_chan ? "DMA" : "PIO"); + if (c->dma_chan) { + c->onenand.read_bufferram = omap2_onenand_read_bufferram; + c->onenand.write_bufferram = omap2_onenand_write_bufferram; + } c->pdev = pdev; c->mtd.priv = &c->onenand; + c->mtd.dev.parent = dev; + mtd_set_of_node(&c->mtd, dev->of_node); - c->mtd.dev.parent = &pdev->dev; - mtd_set_of_node(&c->mtd, pdata->of_node); - - this = &c->onenand; - if (c->dma_chan) { - this->read_bufferram = omap2_onenand_read_bufferram; - this->write_bufferram = omap2_onenand_write_bufferram; - } + dev_info(dev, "initializing on CS%d (0x%08lx), va %p, %s mode\n", + c->gpmc_cs, c->phys_base, c->onenand.base, + c->dma_chan ? "DMA" : "PIO"); if ((r = onenand_scan(&c->mtd, 1)) < 0) goto err_release_dma; + freq = omap2_onenand_get_freq(c->onenand.version_id); + if (freq > 0) { + switch (freq) { + case 104: + latency = 7; + break; + case 83: + latency = 6; + break; + case 66: + latency = 5; + break; + case 56: + latency = 4; + break; + default: /* 40 MHz or lower */ + latency = 3; + break; + } + + r = gpmc_omap_onenand_set_timings(dev, c->gpmc_cs, + freq, latency, &info); + if (r) + goto err_release_onenand; + + r = omap2_onenand_set_cfg(c, info.sync_read, info.sync_write, + latency, info.burst_len); + if (r) + goto err_release_onenand; + + if (info.sync_read || info.sync_write) + dev_info(dev, "optimized timings for %d MHz\n", freq); + } + r = mtd_device_register(&c->mtd, NULL, 0); if (r) goto err_release_onenand; @@ -558,17 +625,6 @@ err_release_onenand: err_release_dma: if (c->dma_chan) dma_release_channel(c->dma_chan); - if (c->gpio_irq) - free_irq(gpio_to_irq(c->gpio_irq), c); -err_release_gpio: - if (c->gpio_irq) - gpio_free(c->gpio_irq); -err_iounmap: - iounmap(c->onenand.base); -err_release_mem_region: - release_mem_region(c->phys_base, c->mem_size); -err_kfree: - kfree(c); return r; } @@ -581,23 +637,23 @@ static int omap2_onenand_remove(struct platform_device *pdev) if (c->dma_chan) dma_release_channel(c->dma_chan); omap2_onenand_shutdown(pdev); - if (c->gpio_irq) { - free_irq(gpio_to_irq(c->gpio_irq), c); - gpio_free(c->gpio_irq); - } - iounmap(c->onenand.base); - release_mem_region(c->phys_base, c->mem_size); - kfree(c); return 0; } +static const struct of_device_id omap2_onenand_id_table[] = { + { .compatible = "ti,omap2-onenand", }, + {}, +}; +MODULE_DEVICE_TABLE(of, omap2_onenand_id_table); + static struct platform_driver omap2_onenand_driver = { .probe = omap2_onenand_probe, .remove = omap2_onenand_remove, .shutdown = omap2_onenand_shutdown, .driver = { .name = DRIVER_NAME, + .of_match_table = omap2_onenand_id_table, }, }; |