1f1a304e7SPratheesh Gangadhar /* 2f1a304e7SPratheesh Gangadhar * Programmable Real-Time Unit Sub System (PRUSS) UIO driver (uio_pruss) 3f1a304e7SPratheesh Gangadhar * 4f1a304e7SPratheesh Gangadhar * This driver exports PRUSS host event out interrupts and PRUSS, L3 RAM, 5f1a304e7SPratheesh Gangadhar * and DDR RAM to user space for applications interacting with PRUSS firmware 6f1a304e7SPratheesh Gangadhar * 7f1a304e7SPratheesh Gangadhar * Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/ 8f1a304e7SPratheesh Gangadhar * 9f1a304e7SPratheesh Gangadhar * This program is free software; you can redistribute it and/or 10f1a304e7SPratheesh Gangadhar * modify it under the terms of the GNU General Public License as 11f1a304e7SPratheesh Gangadhar * published by the Free Software Foundation version 2. 12f1a304e7SPratheesh Gangadhar * 13f1a304e7SPratheesh Gangadhar * This program is distributed "as is" WITHOUT ANY WARRANTY of any 14f1a304e7SPratheesh Gangadhar * kind, whether express or implied; without even the implied warranty 15f1a304e7SPratheesh Gangadhar * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16f1a304e7SPratheesh Gangadhar * GNU General Public License for more details. 17f1a304e7SPratheesh Gangadhar */ 18f1a304e7SPratheesh Gangadhar #include <linux/device.h> 19f1a304e7SPratheesh Gangadhar #include <linux/module.h> 20f1a304e7SPratheesh Gangadhar #include <linux/moduleparam.h> 21f1a304e7SPratheesh Gangadhar #include <linux/platform_device.h> 22f1a304e7SPratheesh Gangadhar #include <linux/uio_driver.h> 23f1a304e7SPratheesh Gangadhar #include <linux/platform_data/uio_pruss.h> 24f1a304e7SPratheesh Gangadhar #include <linux/io.h> 25f1a304e7SPratheesh Gangadhar #include <linux/clk.h> 26f1a304e7SPratheesh Gangadhar #include <linux/dma-mapping.h> 27f1a304e7SPratheesh Gangadhar #include <linux/slab.h> 28f1a304e7SPratheesh Gangadhar #include <mach/sram.h> 29f1a304e7SPratheesh Gangadhar 30f1a304e7SPratheesh Gangadhar #define DRV_NAME "pruss_uio" 31f1a304e7SPratheesh Gangadhar #define DRV_VERSION "1.0" 32f1a304e7SPratheesh Gangadhar 33f1a304e7SPratheesh Gangadhar static int sram_pool_sz = SZ_16K; 34f1a304e7SPratheesh Gangadhar module_param(sram_pool_sz, int, 0); 35f1a304e7SPratheesh Gangadhar MODULE_PARM_DESC(sram_pool_sz, "sram pool size to allocate "); 36f1a304e7SPratheesh Gangadhar 37f1a304e7SPratheesh Gangadhar static int extram_pool_sz = SZ_256K; 38f1a304e7SPratheesh Gangadhar module_param(extram_pool_sz, int, 0); 39f1a304e7SPratheesh Gangadhar MODULE_PARM_DESC(extram_pool_sz, "external ram pool size to allocate"); 40f1a304e7SPratheesh Gangadhar 41f1a304e7SPratheesh Gangadhar /* 42f1a304e7SPratheesh Gangadhar * Host event IRQ numbers from PRUSS - PRUSS can generate upto 8 interrupt 43f1a304e7SPratheesh Gangadhar * events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS 44f1a304e7SPratheesh Gangadhar * firmware and user space application, async notification from PRU firmware 45f1a304e7SPratheesh Gangadhar * to user space application 46f1a304e7SPratheesh Gangadhar * 3 PRU_EVTOUT0 47f1a304e7SPratheesh Gangadhar * 4 PRU_EVTOUT1 48f1a304e7SPratheesh Gangadhar * 5 PRU_EVTOUT2 49f1a304e7SPratheesh Gangadhar * 6 PRU_EVTOUT3 50f1a304e7SPratheesh Gangadhar * 7 PRU_EVTOUT4 51f1a304e7SPratheesh Gangadhar * 8 PRU_EVTOUT5 52f1a304e7SPratheesh Gangadhar * 9 PRU_EVTOUT6 53f1a304e7SPratheesh Gangadhar * 10 PRU_EVTOUT7 54f1a304e7SPratheesh Gangadhar */ 55f1a304e7SPratheesh Gangadhar #define MAX_PRUSS_EVT 8 56f1a304e7SPratheesh Gangadhar 57f1a304e7SPratheesh Gangadhar #define PINTC_HIDISR 0x0038 58f1a304e7SPratheesh Gangadhar #define PINTC_HIPIR 0x0900 59f1a304e7SPratheesh Gangadhar #define HIPIR_NOPEND 0x80000000 60f1a304e7SPratheesh Gangadhar #define PINTC_HIER 0x1500 61f1a304e7SPratheesh Gangadhar 62f1a304e7SPratheesh Gangadhar struct uio_pruss_dev { 63f1a304e7SPratheesh Gangadhar struct uio_info *info; 64f1a304e7SPratheesh Gangadhar struct clk *pruss_clk; 65f1a304e7SPratheesh Gangadhar dma_addr_t sram_paddr; 66f1a304e7SPratheesh Gangadhar dma_addr_t ddr_paddr; 67f1a304e7SPratheesh Gangadhar void __iomem *prussio_vaddr; 68f1a304e7SPratheesh Gangadhar void *sram_vaddr; 69f1a304e7SPratheesh Gangadhar void *ddr_vaddr; 70f1a304e7SPratheesh Gangadhar unsigned int hostirq_start; 71f1a304e7SPratheesh Gangadhar unsigned int pintc_base; 72f1a304e7SPratheesh Gangadhar }; 73f1a304e7SPratheesh Gangadhar 74f1a304e7SPratheesh Gangadhar static irqreturn_t pruss_handler(int irq, struct uio_info *info) 75f1a304e7SPratheesh Gangadhar { 76f1a304e7SPratheesh Gangadhar struct uio_pruss_dev *gdev = info->priv; 77f1a304e7SPratheesh Gangadhar int intr_bit = (irq - gdev->hostirq_start + 2); 78f1a304e7SPratheesh Gangadhar int val, intr_mask = (1 << intr_bit); 79f1a304e7SPratheesh Gangadhar void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base; 80f1a304e7SPratheesh Gangadhar void __iomem *intren_reg = base + PINTC_HIER; 81f1a304e7SPratheesh Gangadhar void __iomem *intrdis_reg = base + PINTC_HIDISR; 82f1a304e7SPratheesh Gangadhar void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2); 83f1a304e7SPratheesh Gangadhar 84f1a304e7SPratheesh Gangadhar val = ioread32(intren_reg); 85f1a304e7SPratheesh Gangadhar /* Is interrupt enabled and active ? */ 86f1a304e7SPratheesh Gangadhar if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND)) 87f1a304e7SPratheesh Gangadhar return IRQ_NONE; 88f1a304e7SPratheesh Gangadhar /* Disable interrupt */ 89f1a304e7SPratheesh Gangadhar iowrite32(intr_bit, intrdis_reg); 90f1a304e7SPratheesh Gangadhar return IRQ_HANDLED; 91f1a304e7SPratheesh Gangadhar } 92f1a304e7SPratheesh Gangadhar 93f1a304e7SPratheesh Gangadhar static void pruss_cleanup(struct platform_device *dev, 94f1a304e7SPratheesh Gangadhar struct uio_pruss_dev *gdev) 95f1a304e7SPratheesh Gangadhar { 96f1a304e7SPratheesh Gangadhar int cnt; 97f1a304e7SPratheesh Gangadhar struct uio_info *p = gdev->info; 98f1a304e7SPratheesh Gangadhar 99f1a304e7SPratheesh Gangadhar for (cnt = 0; cnt < MAX_PRUSS_EVT; cnt++, p++) { 100f1a304e7SPratheesh Gangadhar uio_unregister_device(p); 101f1a304e7SPratheesh Gangadhar kfree(p->name); 102f1a304e7SPratheesh Gangadhar } 103f1a304e7SPratheesh Gangadhar iounmap(gdev->prussio_vaddr); 104f1a304e7SPratheesh Gangadhar if (gdev->ddr_vaddr) { 105f1a304e7SPratheesh Gangadhar dma_free_coherent(&dev->dev, extram_pool_sz, gdev->ddr_vaddr, 106f1a304e7SPratheesh Gangadhar gdev->ddr_paddr); 107f1a304e7SPratheesh Gangadhar } 108f1a304e7SPratheesh Gangadhar if (gdev->sram_vaddr) 109f1a304e7SPratheesh Gangadhar sram_free(gdev->sram_vaddr, sram_pool_sz); 110f1a304e7SPratheesh Gangadhar kfree(gdev->info); 111f1a304e7SPratheesh Gangadhar clk_put(gdev->pruss_clk); 112f1a304e7SPratheesh Gangadhar kfree(gdev); 113f1a304e7SPratheesh Gangadhar } 114f1a304e7SPratheesh Gangadhar 115f1a304e7SPratheesh Gangadhar static int __devinit pruss_probe(struct platform_device *dev) 116f1a304e7SPratheesh Gangadhar { 117f1a304e7SPratheesh Gangadhar struct uio_info *p; 118f1a304e7SPratheesh Gangadhar struct uio_pruss_dev *gdev; 119f1a304e7SPratheesh Gangadhar struct resource *regs_prussio; 120f1a304e7SPratheesh Gangadhar int ret = -ENODEV, cnt = 0, len; 121f1a304e7SPratheesh Gangadhar struct uio_pruss_pdata *pdata = dev->dev.platform_data; 122f1a304e7SPratheesh Gangadhar 123f1a304e7SPratheesh Gangadhar gdev = kzalloc(sizeof(struct uio_pruss_dev), GFP_KERNEL); 124f1a304e7SPratheesh Gangadhar if (!gdev) 125f1a304e7SPratheesh Gangadhar return -ENOMEM; 126f1a304e7SPratheesh Gangadhar 127f1a304e7SPratheesh Gangadhar gdev->info = kzalloc(sizeof(*p) * MAX_PRUSS_EVT, GFP_KERNEL); 128f1a304e7SPratheesh Gangadhar if (!gdev->info) { 129f1a304e7SPratheesh Gangadhar kfree(gdev); 130f1a304e7SPratheesh Gangadhar return -ENOMEM; 131f1a304e7SPratheesh Gangadhar } 132f1a304e7SPratheesh Gangadhar /* Power on PRU in case its not done as part of boot-loader */ 133f1a304e7SPratheesh Gangadhar gdev->pruss_clk = clk_get(&dev->dev, "pruss"); 134f1a304e7SPratheesh Gangadhar if (IS_ERR(gdev->pruss_clk)) { 135f1a304e7SPratheesh Gangadhar dev_err(&dev->dev, "Failed to get clock\n"); 136f1a304e7SPratheesh Gangadhar kfree(gdev->info); 137f1a304e7SPratheesh Gangadhar kfree(gdev); 138f1a304e7SPratheesh Gangadhar ret = PTR_ERR(gdev->pruss_clk); 139f1a304e7SPratheesh Gangadhar return ret; 140f1a304e7SPratheesh Gangadhar } else { 141f1a304e7SPratheesh Gangadhar clk_enable(gdev->pruss_clk); 142f1a304e7SPratheesh Gangadhar } 143f1a304e7SPratheesh Gangadhar 144f1a304e7SPratheesh Gangadhar regs_prussio = platform_get_resource(dev, IORESOURCE_MEM, 0); 145f1a304e7SPratheesh Gangadhar if (!regs_prussio) { 146f1a304e7SPratheesh Gangadhar dev_err(&dev->dev, "No PRUSS I/O resource specified\n"); 147f1a304e7SPratheesh Gangadhar goto out_free; 148f1a304e7SPratheesh Gangadhar } 149f1a304e7SPratheesh Gangadhar 150f1a304e7SPratheesh Gangadhar if (!regs_prussio->start) { 151f1a304e7SPratheesh Gangadhar dev_err(&dev->dev, "Invalid memory resource\n"); 152f1a304e7SPratheesh Gangadhar goto out_free; 153f1a304e7SPratheesh Gangadhar } 154f1a304e7SPratheesh Gangadhar 155f1a304e7SPratheesh Gangadhar gdev->sram_vaddr = sram_alloc(sram_pool_sz, &(gdev->sram_paddr)); 156f1a304e7SPratheesh Gangadhar if (!gdev->sram_vaddr) { 157f1a304e7SPratheesh Gangadhar dev_err(&dev->dev, "Could not allocate SRAM pool\n"); 158f1a304e7SPratheesh Gangadhar goto out_free; 159f1a304e7SPratheesh Gangadhar } 160f1a304e7SPratheesh Gangadhar 161f1a304e7SPratheesh Gangadhar gdev->ddr_vaddr = dma_alloc_coherent(&dev->dev, extram_pool_sz, 162f1a304e7SPratheesh Gangadhar &(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA); 163f1a304e7SPratheesh Gangadhar if (!gdev->ddr_vaddr) { 164f1a304e7SPratheesh Gangadhar dev_err(&dev->dev, "Could not allocate external memory\n"); 165f1a304e7SPratheesh Gangadhar goto out_free; 166f1a304e7SPratheesh Gangadhar } 167f1a304e7SPratheesh Gangadhar 168f1a304e7SPratheesh Gangadhar len = resource_size(regs_prussio); 169f1a304e7SPratheesh Gangadhar gdev->prussio_vaddr = ioremap(regs_prussio->start, len); 170f1a304e7SPratheesh Gangadhar if (!gdev->prussio_vaddr) { 171f1a304e7SPratheesh Gangadhar dev_err(&dev->dev, "Can't remap PRUSS I/O address range\n"); 172f1a304e7SPratheesh Gangadhar goto out_free; 173f1a304e7SPratheesh Gangadhar } 174f1a304e7SPratheesh Gangadhar 175f1a304e7SPratheesh Gangadhar gdev->pintc_base = pdata->pintc_base; 176f1a304e7SPratheesh Gangadhar gdev->hostirq_start = platform_get_irq(dev, 0); 177f1a304e7SPratheesh Gangadhar 178f1a304e7SPratheesh Gangadhar for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) { 179f1a304e7SPratheesh Gangadhar p->mem[0].addr = regs_prussio->start; 180f1a304e7SPratheesh Gangadhar p->mem[0].size = resource_size(regs_prussio); 181f1a304e7SPratheesh Gangadhar p->mem[0].memtype = UIO_MEM_PHYS; 182f1a304e7SPratheesh Gangadhar 183f1a304e7SPratheesh Gangadhar p->mem[1].addr = gdev->sram_paddr; 184f1a304e7SPratheesh Gangadhar p->mem[1].size = sram_pool_sz; 185f1a304e7SPratheesh Gangadhar p->mem[1].memtype = UIO_MEM_PHYS; 186f1a304e7SPratheesh Gangadhar 187f1a304e7SPratheesh Gangadhar p->mem[2].addr = gdev->ddr_paddr; 188f1a304e7SPratheesh Gangadhar p->mem[2].size = extram_pool_sz; 189f1a304e7SPratheesh Gangadhar p->mem[2].memtype = UIO_MEM_PHYS; 190f1a304e7SPratheesh Gangadhar 191f1a304e7SPratheesh Gangadhar p->name = kasprintf(GFP_KERNEL, "pruss_evt%d", cnt); 192f1a304e7SPratheesh Gangadhar p->version = DRV_VERSION; 193f1a304e7SPratheesh Gangadhar 194f1a304e7SPratheesh Gangadhar /* Register PRUSS IRQ lines */ 195f1a304e7SPratheesh Gangadhar p->irq = gdev->hostirq_start + cnt; 196f1a304e7SPratheesh Gangadhar p->handler = pruss_handler; 197f1a304e7SPratheesh Gangadhar p->priv = gdev; 198f1a304e7SPratheesh Gangadhar 199f1a304e7SPratheesh Gangadhar ret = uio_register_device(&dev->dev, p); 200f1a304e7SPratheesh Gangadhar if (ret < 0) 201f1a304e7SPratheesh Gangadhar goto out_free; 202f1a304e7SPratheesh Gangadhar } 203f1a304e7SPratheesh Gangadhar 204f1a304e7SPratheesh Gangadhar platform_set_drvdata(dev, gdev); 205f1a304e7SPratheesh Gangadhar return 0; 206f1a304e7SPratheesh Gangadhar 207f1a304e7SPratheesh Gangadhar out_free: 208f1a304e7SPratheesh Gangadhar pruss_cleanup(dev, gdev); 209f1a304e7SPratheesh Gangadhar return ret; 210f1a304e7SPratheesh Gangadhar } 211f1a304e7SPratheesh Gangadhar 212f1a304e7SPratheesh Gangadhar static int __devexit pruss_remove(struct platform_device *dev) 213f1a304e7SPratheesh Gangadhar { 214f1a304e7SPratheesh Gangadhar struct uio_pruss_dev *gdev = platform_get_drvdata(dev); 215f1a304e7SPratheesh Gangadhar 216f1a304e7SPratheesh Gangadhar pruss_cleanup(dev, gdev); 217f1a304e7SPratheesh Gangadhar platform_set_drvdata(dev, NULL); 218f1a304e7SPratheesh Gangadhar return 0; 219f1a304e7SPratheesh Gangadhar } 220f1a304e7SPratheesh Gangadhar 221f1a304e7SPratheesh Gangadhar static struct platform_driver pruss_driver = { 222f1a304e7SPratheesh Gangadhar .probe = pruss_probe, 223f1a304e7SPratheesh Gangadhar .remove = __devexit_p(pruss_remove), 224f1a304e7SPratheesh Gangadhar .driver = { 225f1a304e7SPratheesh Gangadhar .name = DRV_NAME, 226f1a304e7SPratheesh Gangadhar .owner = THIS_MODULE, 227f1a304e7SPratheesh Gangadhar }, 228f1a304e7SPratheesh Gangadhar }; 229f1a304e7SPratheesh Gangadhar 230f1a304e7SPratheesh Gangadhar static int __init pruss_init_module(void) 231f1a304e7SPratheesh Gangadhar { 232f1a304e7SPratheesh Gangadhar return platform_driver_register(&pruss_driver); 233f1a304e7SPratheesh Gangadhar } 234f1a304e7SPratheesh Gangadhar 235f1a304e7SPratheesh Gangadhar module_init(pruss_init_module); 236f1a304e7SPratheesh Gangadhar 237f1a304e7SPratheesh Gangadhar static void __exit pruss_exit_module(void) 238f1a304e7SPratheesh Gangadhar { 239f1a304e7SPratheesh Gangadhar platform_driver_unregister(&pruss_driver); 240f1a304e7SPratheesh Gangadhar } 241f1a304e7SPratheesh Gangadhar 242f1a304e7SPratheesh Gangadhar module_exit(pruss_exit_module); 243f1a304e7SPratheesh Gangadhar 244f1a304e7SPratheesh Gangadhar MODULE_LICENSE("GPL v2"); 245f1a304e7SPratheesh Gangadhar MODULE_VERSION(DRV_VERSION); 246f1a304e7SPratheesh Gangadhar MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>"); 247f1a304e7SPratheesh Gangadhar MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>"); 248