/* * Driver for Intel MSIC * * Copyright (C) 2011, Intel Corporation * Author: Mika Westerberg <mika.westerberg@linux.intel.com> * * 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/err.h> #include <linux/gpio.h> #include <linux/io.h> #include <linux/init.h> #include <linux/mfd/core.h> #include <linux/mfd/intel_msic.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <asm/intel_scu_ipc.h> #define MSIC_VENDOR(id) ((id >> 6) & 3) #define MSIC_VERSION(id) (id & 0x3f) #define MSIC_MAJOR(id) ('A' + ((id >> 3) & 7)) #define MSIC_MINOR(id) (id & 7) /* * MSIC interrupt tree is readable from SRAM at INTEL_MSIC_IRQ_PHYS_BASE. * Since IRQ block starts from address 0x002 we need to subtract that from * the actual IRQ status register address. */ #define MSIC_IRQ_STATUS(x) (INTEL_MSIC_IRQ_PHYS_BASE + ((x) - 2)) #define MSIC_IRQ_STATUS_ACCDET MSIC_IRQ_STATUS(INTEL_MSIC_ACCDET) /* * The SCU hardware has limitation of 16 bytes per read/write buffer on * Medfield. */ #define SCU_IPC_RWBUF_LIMIT 16 /** * struct intel_msic - an MSIC MFD instance * @pdev: pointer to the platform device * @vendor: vendor ID * @version: chip version * @irq_base: base address of the mapped MSIC SRAM interrupt tree */ struct intel_msic { struct platform_device *pdev; unsigned vendor; unsigned version; void __iomem *irq_base; }; static struct resource msic_touch_resources[] = { { .flags = IORESOURCE_IRQ, }, }; static struct resource msic_adc_resources[] = { { .flags = IORESOURCE_IRQ, }, }; static struct resource msic_battery_resources[] = { { .flags = IORESOURCE_IRQ, }, }; static struct resource msic_gpio_resources[] = { { .flags = IORESOURCE_IRQ, }, }; static struct resource msic_audio_resources[] = { { .name = "IRQ", .flags = IORESOURCE_IRQ, }, /* * We will pass IRQ_BASE to the driver now but this can be removed * when/if the driver starts to use intel_msic_irq_read(). */ { .name = "IRQ_BASE", .flags = IORESOURCE_MEM, .start = MSIC_IRQ_STATUS_ACCDET, .end = MSIC_IRQ_STATUS_ACCDET, }, }; static struct resource msic_hdmi_resources[] = { { .flags = IORESOURCE_IRQ, }, }; static struct resource msic_thermal_resources[] = { { .flags = IORESOURCE_IRQ, }, }; static struct resource msic_power_btn_resources[] = { { .flags = IORESOURCE_IRQ, }, }; static struct resource msic_ocd_resources[] = { { .flags = IORESOURCE_IRQ, }, }; /* * Devices that are part of the MSIC and are available via firmware * populated SFI DEVS table. */ static struct mfd_cell msic_devs[] = { [INTEL_MSIC_BLOCK_TOUCH] = { .name = "msic_touch", .num_resources = ARRAY_SIZE(msic_touch_resources), .resources = msic_touch_resources, }, [INTEL_MSIC_BLOCK_ADC] = { .name = "msic_adc", .num_resources = ARRAY_SIZE(msic_adc_resources), .resources = msic_adc_resources, }, [INTEL_MSIC_BLOCK_BATTERY] = { .name = "msic_battery", .num_resources = ARRAY_SIZE(msic_battery_resources), .resources = msic_battery_resources, }, [INTEL_MSIC_BLOCK_GPIO] = { .name = "msic_gpio", .num_resources = ARRAY_SIZE(msic_gpio_resources), .resources = msic_gpio_resources, }, [INTEL_MSIC_BLOCK_AUDIO] = { .name = "msic_audio", .num_resources = ARRAY_SIZE(msic_audio_resources), .resources = msic_audio_resources, }, [INTEL_MSIC_BLOCK_HDMI] = { .name = "msic_hdmi", .num_resources = ARRAY_SIZE(msic_hdmi_resources), .resources = msic_hdmi_resources, }, [INTEL_MSIC_BLOCK_THERMAL] = { .name = "msic_thermal", .num_resources = ARRAY_SIZE(msic_thermal_resources), .resources = msic_thermal_resources, }, [INTEL_MSIC_BLOCK_POWER_BTN] = { .name = "msic_power_btn", .num_resources = ARRAY_SIZE(msic_power_btn_resources), .resources = msic_power_btn_resources, }, [INTEL_MSIC_BLOCK_OCD] = { .name = "msic_ocd", .num_resources = ARRAY_SIZE(msic_ocd_resources), .resources = msic_ocd_resources, }, }; /* * Other MSIC related devices which are not directly available via SFI DEVS * table. These can be pseudo devices, regulators etc. which are needed for * different purposes. * * These devices appear only after the MSIC driver itself is initialized so * we can guarantee that the SCU IPC interface is ready. */ static const struct mfd_cell msic_other_devs[] = { /* Audio codec in the MSIC */ { .id = -1, .name = "sn95031", }, }; /** * intel_msic_reg_read - read a single MSIC register * @reg: register to read * @val: register value is placed here * * Read a single register from MSIC. Returns %0 on success and negative * errno in case of failure. * * Function may sleep. */ int intel_msic_reg_read(unsigned short reg, u8 *val) { return intel_scu_ipc_ioread8(reg, val); } EXPORT_SYMBOL_GPL(intel_msic_reg_read); /** * intel_msic_reg_write - write a single MSIC register * @reg: register to write * @val: value to write to that register * * Write a single MSIC register. Returns 0 on success and negative * errno in case of failure. * * Function may sleep. */ int intel_msic_reg_write(unsigned short reg, u8 val) { return intel_scu_ipc_iowrite8(reg, val); } EXPORT_SYMBOL_GPL(intel_msic_reg_write); /** * intel_msic_reg_update - update a single MSIC register * @reg: register to update * @val: value to write to the register * @mask: specifies which of the bits are updated (%0 = don't update, * %1 = update) * * Perform an update to a register @reg. @mask is used to specify which * bits are updated. Returns %0 in case of success and negative errno in * case of failure. * * Function may sleep. */ int intel_msic_reg_update(unsigned short reg, u8 val, u8 mask) { return intel_scu_ipc_update_register(reg, val, mask); } EXPORT_SYMBOL_GPL(intel_msic_reg_update); /** * intel_msic_bulk_read - read an array of registers * @reg: array of register addresses to read * @buf: array where the read values are placed * @count: number of registers to read * * Function reads @count registers from the MSIC using addresses passed in * @reg. Read values are placed in @buf. Reads are performed atomically * wrt. MSIC. * * Returns %0 in case of success and negative errno in case of failure. * * Function may sleep. */ int intel_msic_bulk_read(unsigned short *reg, u8 *buf, size_t count) { if (WARN_ON(count > SCU_IPC_RWBUF_LIMIT)) return -EINVAL; return intel_scu_ipc_readv(reg, buf, count); } EXPORT_SYMBOL_GPL(intel_msic_bulk_read); /** * intel_msic_bulk_write - write an array of values to the MSIC registers * @reg: array of registers to write * @buf: values to write to each register * @count: number of registers to write * * Function writes @count registers in @buf to MSIC. Writes are performed * atomically wrt MSIC. Returns %0 in case of success and negative errno in * case of failure. * * Function may sleep. */ int intel_msic_bulk_write(unsigned short *reg, u8 *buf, size_t count) { if (WARN_ON(count > SCU_IPC_RWBUF_LIMIT)) return -EINVAL; return intel_scu_ipc_writev(reg, buf, count); } EXPORT_SYMBOL_GPL(intel_msic_bulk_write); /** * intel_msic_irq_read - read a register from an MSIC interrupt tree * @msic: MSIC instance * @reg: interrupt register (between %INTEL_MSIC_IRQLVL1 and * %INTEL_MSIC_RESETIRQ2) * @val: value of the register is placed here * * This function can be used by an MSIC subdevice interrupt handler to read * a register value from the MSIC interrupt tree. In this way subdevice * drivers don't have to map in the interrupt tree themselves but can just * call this function instead. * * Function doesn't sleep and is callable from interrupt context. * * Returns %-EINVAL if @reg is outside of the allowed register region. */ int intel_msic_irq_read(struct intel_msic *msic, unsigned short reg, u8 *val) { if (WARN_ON(reg < INTEL_MSIC_IRQLVL1 || reg > INTEL_MSIC_RESETIRQ2)) return -EINVAL; *val = readb(msic->irq_base + (reg - INTEL_MSIC_IRQLVL1)); return 0; } EXPORT_SYMBOL_GPL(intel_msic_irq_read); static int intel_msic_init_devices(struct intel_msic *msic) { struct platform_device *pdev = msic->pdev; struct intel_msic_platform_data *pdata = dev_get_platdata(&pdev->dev); int ret, i; if (pdata->gpio) { struct mfd_cell *cell = &msic_devs[INTEL_MSIC_BLOCK_GPIO]; cell->platform_data = pdata->gpio; cell->pdata_size = sizeof(*pdata->gpio); } if (pdata->ocd) { unsigned gpio = pdata->ocd->gpio; ret = devm_gpio_request_one(&pdev->dev, gpio, GPIOF_IN, "ocd_gpio"); if (ret) { dev_err(&pdev->dev, "failed to register OCD GPIO\n"); return ret; } ret = gpio_to_irq(gpio); if (ret < 0) { dev_err(&pdev->dev, "no IRQ number for OCD GPIO\n"); return ret; } /* Update the IRQ number for the OCD */ pdata->irq[INTEL_MSIC_BLOCK_OCD] = ret; } for (i = 0; i < ARRAY_SIZE(msic_devs); i++) { if (!pdata->irq[i]) continue; ret = mfd_add_devices(&pdev->dev, -1, &msic_devs[i], 1, NULL, pdata->irq[i], NULL); if (ret) goto fail; } ret = mfd_add_devices(&pdev->dev, 0, msic_other_devs, ARRAY_SIZE(msic_other_devs), NULL, 0, NULL); if (ret) goto fail; return 0; fail: mfd_remove_devices(&pdev->dev); return ret; } static void intel_msic_remove_devices(struct intel_msic *msic) { struct platform_device *pdev = msic->pdev; mfd_remove_devices(&pdev->dev); } static int intel_msic_probe(struct platform_device *pdev) { struct intel_msic_platform_data *pdata = dev_get_platdata(&pdev->dev); struct intel_msic *msic; struct resource *res; u8 id0, id1; int ret; if (!pdata) { dev_err(&pdev->dev, "no platform data passed\n"); return -EINVAL; } /* First validate that we have an MSIC in place */ ret = intel_scu_ipc_ioread8(INTEL_MSIC_ID0, &id0); if (ret) { dev_err(&pdev->dev, "failed to identify the MSIC chip (ID0)\n"); return -ENXIO; } ret = intel_scu_ipc_ioread8(INTEL_MSIC_ID1, &id1); if (ret) { dev_err(&pdev->dev, "failed to identify the MSIC chip (ID1)\n"); return -ENXIO; } if (MSIC_VENDOR(id0) != MSIC_VENDOR(id1)) { dev_err(&pdev->dev, "invalid vendor ID: %x, %x\n", id0, id1); return -ENXIO; } msic = devm_kzalloc(&pdev->dev, sizeof(*msic), GFP_KERNEL); if (!msic) return -ENOMEM; msic->vendor = MSIC_VENDOR(id0); msic->version = MSIC_VERSION(id0); msic->pdev = pdev; /* * Map in the MSIC interrupt tree area in SRAM. This is exposed to * the clients via intel_msic_irq_read(). */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); msic->irq_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(msic->irq_base)) return PTR_ERR(msic->irq_base); platform_set_drvdata(pdev, msic); ret = intel_msic_init_devices(msic); if (ret) { dev_err(&pdev->dev, "failed to initialize MSIC devices\n"); return ret; } dev_info(&pdev->dev, "Intel MSIC version %c%d (vendor %#x)\n", MSIC_MAJOR(msic->version), MSIC_MINOR(msic->version), msic->vendor); return 0; } static int intel_msic_remove(struct platform_device *pdev) { struct intel_msic *msic = platform_get_drvdata(pdev); intel_msic_remove_devices(msic); return 0; } static struct platform_driver intel_msic_driver = { .probe = intel_msic_probe, .remove = intel_msic_remove, .driver = { .name = "intel_msic", }, }; builtin_platform_driver(intel_msic_driver);