diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-ocores.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-ocores.c | 269 |
1 files changed, 175 insertions, 94 deletions
diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c index 18068dee48f..0e10cc6182f 100644 --- a/drivers/i2c/busses/i2c-ocores.c +++ b/drivers/i2c/busses/i2c-ocores.c @@ -4,49 +4,17 @@ * * Peter Korsgaard <jacmet@sunsite.dk> * + * Support for the GRLIB port of the controller by + * Andreas Larsson <andreas@gaisler.com> + * * 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. */ -/* - * Device tree configuration: - * - * Required properties: - * - compatible : "opencores,i2c-ocores" - * - reg : bus address start and address range size of device - * - interrupts : interrupt number - * - regstep : size of device registers in bytes - * - clock-frequency : frequency of bus clock in Hz - * - * Example: - * - * i2c0: ocores@a0000000 { - * compatible = "opencores,i2c-ocores"; - * reg = <0xa0000000 0x8>; - * interrupts = <10>; - * - * regstep = <1>; - * clock-frequency = <20000000>; - * - * -- Devices connected on this I2C bus get - * -- defined here; address- and size-cells - * -- apply to these child devices - * - * #address-cells = <1>; - * #size-cells = <0>; - * - * dummy@60 { - * compatible = "dummy"; - * reg = <60>; - * }; - * }; - * - */ - +#include <linux/err.h> #include <linux/kernel.h> #include <linux/module.h> -#include <linux/init.h> #include <linux/errno.h> #include <linux/platform_device.h> #include <linux/i2c.h> @@ -55,10 +23,12 @@ #include <linux/i2c-ocores.h> #include <linux/slab.h> #include <linux/io.h> +#include <linux/log2.h> struct ocores_i2c { void __iomem *base; - int regstep; + u32 reg_shift; + u32 reg_io_width; wait_queue_head_t wait; struct i2c_adapter adap; struct i2c_msg *msg; @@ -66,6 +36,8 @@ struct ocores_i2c { int nmsgs; int state; /* see STATE_ */ int clock_khz; + void (*setreg)(struct ocores_i2c *i2c, int reg, u8 value); + u8 (*getreg)(struct ocores_i2c *i2c, int reg); }; /* registers */ @@ -99,14 +71,47 @@ struct ocores_i2c { #define STATE_READ 3 #define STATE_ERROR 4 +#define TYPE_OCORES 0 +#define TYPE_GRLIB 1 + +static void oc_setreg_8(struct ocores_i2c *i2c, int reg, u8 value) +{ + iowrite8(value, i2c->base + (reg << i2c->reg_shift)); +} + +static void oc_setreg_16(struct ocores_i2c *i2c, int reg, u8 value) +{ + iowrite16(value, i2c->base + (reg << i2c->reg_shift)); +} + +static void oc_setreg_32(struct ocores_i2c *i2c, int reg, u8 value) +{ + iowrite32(value, i2c->base + (reg << i2c->reg_shift)); +} + +static inline u8 oc_getreg_8(struct ocores_i2c *i2c, int reg) +{ + return ioread8(i2c->base + (reg << i2c->reg_shift)); +} + +static inline u8 oc_getreg_16(struct ocores_i2c *i2c, int reg) +{ + return ioread16(i2c->base + (reg << i2c->reg_shift)); +} + +static inline u8 oc_getreg_32(struct ocores_i2c *i2c, int reg) +{ + return ioread32(i2c->base + (reg << i2c->reg_shift)); +} + static inline void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value) { - iowrite8(value, i2c->base + reg * i2c->regstep); + i2c->setreg(i2c, reg, value); } static inline u8 oc_getreg(struct ocores_i2c *i2c, int reg) { - return ioread8(i2c->base + reg * i2c->regstep); + return i2c->getreg(i2c, reg); } static void ocores_process(struct ocores_i2c *i2c) @@ -241,30 +246,95 @@ static const struct i2c_algorithm ocores_algorithm = { static struct i2c_adapter ocores_adapter = { .owner = THIS_MODULE, .name = "i2c-ocores", - .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, + .class = I2C_CLASS_HWMON | I2C_CLASS_SPD | I2C_CLASS_DEPRECATED, .algo = &ocores_algorithm, }; +static const struct of_device_id ocores_i2c_match[] = { + { + .compatible = "opencores,i2c-ocores", + .data = (void *)TYPE_OCORES, + }, + { + .compatible = "aeroflexgaisler,i2cmst", + .data = (void *)TYPE_GRLIB, + }, + {}, +}; +MODULE_DEVICE_TABLE(of, ocores_i2c_match); + #ifdef CONFIG_OF -static int ocores_i2c_of_probe(struct platform_device* pdev, - struct ocores_i2c* i2c) +/* Read and write functions for the GRLIB port of the controller. Registers are + * 32-bit big endian and the PRELOW and PREHIGH registers are merged into one + * register. The subsequent registers has their offset decreased accordingly. */ +static u8 oc_getreg_grlib(struct ocores_i2c *i2c, int reg) { - const __be32* val; + u32 rd; + int rreg = reg; + if (reg != OCI2C_PRELOW) + rreg--; + rd = ioread32be(i2c->base + (rreg << i2c->reg_shift)); + if (reg == OCI2C_PREHIGH) + return (u8)(rd >> 8); + else + return (u8)rd; +} - val = of_get_property(pdev->dev.of_node, "regstep", NULL); - if (!val) { - dev_err(&pdev->dev, "Missing required parameter 'regstep'"); - return -ENODEV; +static void oc_setreg_grlib(struct ocores_i2c *i2c, int reg, u8 value) +{ + u32 curr, wr; + int rreg = reg; + if (reg != OCI2C_PRELOW) + rreg--; + if (reg == OCI2C_PRELOW || reg == OCI2C_PREHIGH) { + curr = ioread32be(i2c->base + (rreg << i2c->reg_shift)); + if (reg == OCI2C_PRELOW) + wr = (curr & 0xff00) | value; + else + wr = (((u32)value) << 8) | (curr & 0xff); + } else { + wr = value; } - i2c->regstep = be32_to_cpup(val); + iowrite32be(wr, i2c->base + (rreg << i2c->reg_shift)); +} - val = of_get_property(pdev->dev.of_node, "clock-frequency", NULL); - if (!val) { +static int ocores_i2c_of_probe(struct platform_device *pdev, + struct ocores_i2c *i2c) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *match; + u32 val; + + if (of_property_read_u32(np, "reg-shift", &i2c->reg_shift)) { + /* no 'reg-shift', check for deprecated 'regstep' */ + if (!of_property_read_u32(np, "regstep", &val)) { + if (!is_power_of_2(val)) { + dev_err(&pdev->dev, "invalid regstep %d\n", + val); + return -EINVAL; + } + i2c->reg_shift = ilog2(val); + dev_warn(&pdev->dev, + "regstep property deprecated, use reg-shift\n"); + } + } + + if (of_property_read_u32(np, "clock-frequency", &val)) { dev_err(&pdev->dev, - "Missing required parameter 'clock-frequency'"); + "Missing required parameter 'clock-frequency'\n"); return -ENODEV; } - i2c->clock_khz = be32_to_cpup(val) / 1000; + i2c->clock_khz = val / 1000; + + of_property_read_u32(pdev->dev.of_node, "reg-io-width", + &i2c->reg_io_width); + + match = of_match_node(ocores_i2c_match, pdev->dev.of_node); + if (match && (long)match->data == TYPE_GRLIB) { + dev_dbg(&pdev->dev, "GRLIB variant of i2c-ocores\n"); + i2c->setreg = oc_setreg_grlib; + i2c->getreg = oc_getreg_grlib; + } return 0; } @@ -272,42 +342,32 @@ static int ocores_i2c_of_probe(struct platform_device* pdev, #define ocores_i2c_of_probe(pdev,i2c) -ENODEV #endif -static int __devinit ocores_i2c_probe(struct platform_device *pdev) +static int ocores_i2c_probe(struct platform_device *pdev) { struct ocores_i2c *i2c; struct ocores_i2c_platform_data *pdata; - struct resource *res, *res2; + struct resource *res; + int irq; int ret; int i; - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENODEV; - - res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!res2) - return -ENODEV; + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL); if (!i2c) return -ENOMEM; - if (!devm_request_mem_region(&pdev->dev, res->start, - resource_size(res), pdev->name)) { - dev_err(&pdev->dev, "Memory region busy\n"); - return -EBUSY; - } - - i2c->base = devm_ioremap_nocache(&pdev->dev, res->start, - resource_size(res)); - if (!i2c->base) { - dev_err(&pdev->dev, "Unable to map registers\n"); - return -EIO; - } + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + i2c->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(i2c->base)) + return PTR_ERR(i2c->base); - pdata = pdev->dev.platform_data; + pdata = dev_get_platdata(&pdev->dev); if (pdata) { - i2c->regstep = pdata->regstep; + i2c->reg_shift = pdata->reg_shift; + i2c->reg_io_width = pdata->reg_io_width; i2c->clock_khz = pdata->clock_khz; } else { ret = ocores_i2c_of_probe(pdev, i2c); @@ -315,10 +375,37 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev) return ret; } + if (i2c->reg_io_width == 0) + i2c->reg_io_width = 1; /* Set to default value */ + + if (!i2c->setreg || !i2c->getreg) { + switch (i2c->reg_io_width) { + case 1: + i2c->setreg = oc_setreg_8; + i2c->getreg = oc_getreg_8; + break; + + case 2: + i2c->setreg = oc_setreg_16; + i2c->getreg = oc_getreg_16; + break; + + case 4: + i2c->setreg = oc_setreg_32; + i2c->getreg = oc_getreg_32; + break; + + default: + dev_err(&pdev->dev, "Unsupported I/O width (%d)\n", + i2c->reg_io_width); + return -EINVAL; + } + } + ocores_init(i2c); init_waitqueue_head(&i2c->wait); - ret = devm_request_irq(&pdev->dev, res2->start, ocores_isr, 0, + ret = devm_request_irq(&pdev->dev, irq, ocores_isr, 0, pdev->name, i2c); if (ret) { dev_err(&pdev->dev, "Cannot claim IRQ\n"); @@ -348,7 +435,7 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev) return 0; } -static int __devexit ocores_i2c_remove(struct platform_device* pdev) +static int ocores_i2c_remove(struct platform_device *pdev) { struct ocores_i2c *i2c = platform_get_drvdata(pdev); @@ -358,15 +445,14 @@ static int __devexit ocores_i2c_remove(struct platform_device* pdev) /* remove adapter & data */ i2c_del_adapter(&i2c->adap); - platform_set_drvdata(pdev, NULL); return 0; } -#ifdef CONFIG_PM -static int ocores_i2c_suspend(struct platform_device *pdev, pm_message_t state) +#ifdef CONFIG_PM_SLEEP +static int ocores_i2c_suspend(struct device *dev) { - struct ocores_i2c *i2c = platform_get_drvdata(pdev); + struct ocores_i2c *i2c = dev_get_drvdata(dev); u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL); /* make sure the device is disabled */ @@ -375,34 +461,29 @@ static int ocores_i2c_suspend(struct platform_device *pdev, pm_message_t state) return 0; } -static int ocores_i2c_resume(struct platform_device *pdev) +static int ocores_i2c_resume(struct device *dev) { - struct ocores_i2c *i2c = platform_get_drvdata(pdev); + struct ocores_i2c *i2c = dev_get_drvdata(dev); ocores_init(i2c); return 0; } + +static SIMPLE_DEV_PM_OPS(ocores_i2c_pm, ocores_i2c_suspend, ocores_i2c_resume); +#define OCORES_I2C_PM (&ocores_i2c_pm) #else -#define ocores_i2c_suspend NULL -#define ocores_i2c_resume NULL +#define OCORES_I2C_PM NULL #endif -static struct of_device_id ocores_i2c_match[] = { - { .compatible = "opencores,i2c-ocores", }, - {}, -}; -MODULE_DEVICE_TABLE(of, ocores_i2c_match); - static struct platform_driver ocores_i2c_driver = { .probe = ocores_i2c_probe, - .remove = __devexit_p(ocores_i2c_remove), - .suspend = ocores_i2c_suspend, - .resume = ocores_i2c_resume, + .remove = ocores_i2c_remove, .driver = { .owner = THIS_MODULE, .name = "ocores-i2c", .of_match_table = ocores_i2c_match, + .pm = OCORES_I2C_PM, }, }; 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