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Linux/drivers/uio/uio_pruss.c

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

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