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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/sizes.h>
 28 #include <linux/slab.h>
 29 #include <linux/genalloc.h>
 30 
 31 #define DRV_NAME "pruss_uio"
 32 #define DRV_VERSION "1.0"
 33 
 34 static int sram_pool_sz = SZ_16K;
 35 module_param(sram_pool_sz, int, 0);
 36 MODULE_PARM_DESC(sram_pool_sz, "sram pool size to allocate ");
 37 
 38 static int extram_pool_sz = SZ_256K;
 39 module_param(extram_pool_sz, int, 0);
 40 MODULE_PARM_DESC(extram_pool_sz, "external ram pool size to allocate");
 41 
 42 /*
 43  * Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt
 44  * events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS
 45  * firmware and user space application, async notification from PRU firmware
 46  * to user space application
 47  * 3    PRU_EVTOUT0
 48  * 4    PRU_EVTOUT1
 49  * 5    PRU_EVTOUT2
 50  * 6    PRU_EVTOUT3
 51  * 7    PRU_EVTOUT4
 52  * 8    PRU_EVTOUT5
 53  * 9    PRU_EVTOUT6
 54  * 10   PRU_EVTOUT7
 55 */
 56 #define MAX_PRUSS_EVT   8
 57 
 58 #define PINTC_HIDISR    0x0038
 59 #define PINTC_HIPIR     0x0900
 60 #define HIPIR_NOPEND    0x80000000
 61 #define PINTC_HIER      0x1500
 62 
 63 struct uio_pruss_dev {
 64         struct uio_info *info;
 65         struct clk *pruss_clk;
 66         dma_addr_t sram_paddr;
 67         dma_addr_t ddr_paddr;
 68         void __iomem *prussio_vaddr;
 69         unsigned long sram_vaddr;
 70         void *ddr_vaddr;
 71         unsigned int hostirq_start;
 72         unsigned int pintc_base;
 73         struct gen_pool *sram_pool;
 74 };
 75 
 76 static irqreturn_t pruss_handler(int irq, struct uio_info *info)
 77 {
 78         struct uio_pruss_dev *gdev = info->priv;
 79         int intr_bit = (irq - gdev->hostirq_start + 2);
 80         int val, intr_mask = (1 << intr_bit);
 81         void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base;
 82         void __iomem *intren_reg = base + PINTC_HIER;
 83         void __iomem *intrdis_reg = base + PINTC_HIDISR;
 84         void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2);
 85 
 86         val = ioread32(intren_reg);
 87         /* Is interrupt enabled and active ? */
 88         if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND))
 89                 return IRQ_NONE;
 90         /* Disable interrupt */
 91         iowrite32(intr_bit, intrdis_reg);
 92         return IRQ_HANDLED;
 93 }
 94 
 95 static void pruss_cleanup(struct device *dev, struct uio_pruss_dev *gdev)
 96 {
 97         int cnt;
 98         struct uio_info *p = gdev->info;
 99 
100         for (cnt = 0; cnt < MAX_PRUSS_EVT; cnt++, p++) {
101                 uio_unregister_device(p);
102                 kfree(p->name);
103         }
104         iounmap(gdev->prussio_vaddr);
105         if (gdev->ddr_vaddr) {
106                 dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr,
107                         gdev->ddr_paddr);
108         }
109         if (gdev->sram_vaddr)
110                 gen_pool_free(gdev->sram_pool,
111                               gdev->sram_vaddr,
112                               sram_pool_sz);
113         kfree(gdev->info);
114         clk_put(gdev->pruss_clk);
115         kfree(gdev);
116 }
117 
118 static int pruss_probe(struct platform_device *pdev)
119 {
120         struct uio_info *p;
121         struct uio_pruss_dev *gdev;
122         struct resource *regs_prussio;
123         struct device *dev = &pdev->dev;
124         int ret = -ENODEV, cnt = 0, len;
125         struct uio_pruss_pdata *pdata = dev_get_platdata(dev);
126 
127         gdev = kzalloc(sizeof(struct uio_pruss_dev), GFP_KERNEL);
128         if (!gdev)
129                 return -ENOMEM;
130 
131         gdev->info = kzalloc(sizeof(*p) * MAX_PRUSS_EVT, GFP_KERNEL);
132         if (!gdev->info) {
133                 kfree(gdev);
134                 return -ENOMEM;
135         }
136 
137         /* Power on PRU in case its not done as part of boot-loader */
138         gdev->pruss_clk = clk_get(dev, "pruss");
139         if (IS_ERR(gdev->pruss_clk)) {
140                 dev_err(dev, "Failed to get clock\n");
141                 ret = PTR_ERR(gdev->pruss_clk);
142                 kfree(gdev->info);
143                 kfree(gdev);
144                 return ret;
145         } else {
146                 clk_enable(gdev->pruss_clk);
147         }
148 
149         regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150         if (!regs_prussio) {
151                 dev_err(dev, "No PRUSS I/O resource specified\n");
152                 goto out_free;
153         }
154 
155         if (!regs_prussio->start) {
156                 dev_err(dev, "Invalid memory resource\n");
157                 goto out_free;
158         }
159 
160         if (pdata->sram_pool) {
161                 gdev->sram_pool = pdata->sram_pool;
162                 gdev->sram_vaddr =
163                         (unsigned long)gen_pool_dma_alloc(gdev->sram_pool,
164                                         sram_pool_sz, &gdev->sram_paddr);
165                 if (!gdev->sram_vaddr) {
166                         dev_err(dev, "Could not allocate SRAM pool\n");
167                         goto out_free;
168                 }
169         }
170 
171         gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz,
172                                 &(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA);
173         if (!gdev->ddr_vaddr) {
174                 dev_err(dev, "Could not allocate external memory\n");
175                 goto out_free;
176         }
177 
178         len = resource_size(regs_prussio);
179         gdev->prussio_vaddr = ioremap(regs_prussio->start, len);
180         if (!gdev->prussio_vaddr) {
181                 dev_err(dev, "Can't remap PRUSS I/O  address range\n");
182                 goto out_free;
183         }
184 
185         gdev->pintc_base = pdata->pintc_base;
186         gdev->hostirq_start = platform_get_irq(pdev, 0);
187 
188         for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) {
189                 p->mem[0].addr = regs_prussio->start;
190                 p->mem[0].size = resource_size(regs_prussio);
191                 p->mem[0].memtype = UIO_MEM_PHYS;
192 
193                 p->mem[1].addr = gdev->sram_paddr;
194                 p->mem[1].size = sram_pool_sz;
195                 p->mem[1].memtype = UIO_MEM_PHYS;
196 
197                 p->mem[2].addr = gdev->ddr_paddr;
198                 p->mem[2].size = extram_pool_sz;
199                 p->mem[2].memtype = UIO_MEM_PHYS;
200 
201                 p->name = kasprintf(GFP_KERNEL, "pruss_evt%d", cnt);
202                 p->version = DRV_VERSION;
203 
204                 /* Register PRUSS IRQ lines */
205                 p->irq = gdev->hostirq_start + cnt;
206                 p->handler = pruss_handler;
207                 p->priv = gdev;
208 
209                 ret = uio_register_device(dev, p);
210                 if (ret < 0)
211                         goto out_free;
212         }
213 
214         platform_set_drvdata(pdev, gdev);
215         return 0;
216 
217 out_free:
218         pruss_cleanup(dev, gdev);
219         return ret;
220 }
221 
222 static int pruss_remove(struct platform_device *dev)
223 {
224         struct uio_pruss_dev *gdev = platform_get_drvdata(dev);
225 
226         pruss_cleanup(&dev->dev, gdev);
227         return 0;
228 }
229 
230 static struct platform_driver pruss_driver = {
231         .probe = pruss_probe,
232         .remove = pruss_remove,
233         .driver = {
234                    .name = DRV_NAME,
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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