Blame view
drivers/uio/uio_pruss.c
7.08 KB
f1a304e79 UIO: add PRUSS UI... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 |
/* * Programmable Real-Time Unit Sub System (PRUSS) UIO driver (uio_pruss) * * This driver exports PRUSS host event out interrupts and PRUSS, L3 RAM, * and DDR RAM to user space for applications interacting with PRUSS firmware * * Copyright (C) 2010-11 Texas Instruments Incorporated - http://www.ti.com/ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/device.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/platform_device.h> #include <linux/uio_driver.h> #include <linux/platform_data/uio_pruss.h> #include <linux/io.h> #include <linux/clk.h> #include <linux/dma-mapping.h> |
876726760 uio: pruss: Inclu... |
27 |
#include <linux/sizes.h> |
f1a304e79 UIO: add PRUSS UI... |
28 |
#include <linux/slab.h> |
2eb2478d4 uio: uio_pruss: r... |
29 |
#include <linux/genalloc.h> |
f1a304e79 UIO: add PRUSS UI... |
30 31 32 33 34 35 36 37 38 39 40 41 42 |
#define DRV_NAME "pruss_uio" #define DRV_VERSION "1.0" static int sram_pool_sz = SZ_16K; module_param(sram_pool_sz, int, 0); MODULE_PARM_DESC(sram_pool_sz, "sram pool size to allocate "); static int extram_pool_sz = SZ_256K; module_param(extram_pool_sz, int, 0); MODULE_PARM_DESC(extram_pool_sz, "external ram pool size to allocate"); /* |
25985edce Fix common misspe... |
43 |
* Host event IRQ numbers from PRUSS - PRUSS can generate up to 8 interrupt |
f1a304e79 UIO: add PRUSS UI... |
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 |
* events to AINTC of ARM host processor - which can be used for IPC b/w PRUSS * firmware and user space application, async notification from PRU firmware * to user space application * 3 PRU_EVTOUT0 * 4 PRU_EVTOUT1 * 5 PRU_EVTOUT2 * 6 PRU_EVTOUT3 * 7 PRU_EVTOUT4 * 8 PRU_EVTOUT5 * 9 PRU_EVTOUT6 * 10 PRU_EVTOUT7 */ #define MAX_PRUSS_EVT 8 #define PINTC_HIDISR 0x0038 #define PINTC_HIPIR 0x0900 #define HIPIR_NOPEND 0x80000000 #define PINTC_HIER 0x1500 struct uio_pruss_dev { struct uio_info *info; struct clk *pruss_clk; dma_addr_t sram_paddr; dma_addr_t ddr_paddr; void __iomem *prussio_vaddr; |
2eb2478d4 uio: uio_pruss: r... |
69 |
unsigned long sram_vaddr; |
f1a304e79 UIO: add PRUSS UI... |
70 71 72 |
void *ddr_vaddr; unsigned int hostirq_start; unsigned int pintc_base; |
2eb2478d4 uio: uio_pruss: r... |
73 |
struct gen_pool *sram_pool; |
f1a304e79 UIO: add PRUSS UI... |
74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 |
}; static irqreturn_t pruss_handler(int irq, struct uio_info *info) { struct uio_pruss_dev *gdev = info->priv; int intr_bit = (irq - gdev->hostirq_start + 2); int val, intr_mask = (1 << intr_bit); void __iomem *base = gdev->prussio_vaddr + gdev->pintc_base; void __iomem *intren_reg = base + PINTC_HIER; void __iomem *intrdis_reg = base + PINTC_HIDISR; void __iomem *intrstat_reg = base + PINTC_HIPIR + (intr_bit << 2); val = ioread32(intren_reg); /* Is interrupt enabled and active ? */ if (!(val & intr_mask) && (ioread32(intrstat_reg) & HIPIR_NOPEND)) return IRQ_NONE; /* Disable interrupt */ iowrite32(intr_bit, intrdis_reg); return IRQ_HANDLED; } |
4719ebfd8 uio: uio_pruss: u... |
94 |
static void pruss_cleanup(struct device *dev, struct uio_pruss_dev *gdev) |
f1a304e79 UIO: add PRUSS UI... |
95 96 97 98 99 100 101 102 103 104 |
{ int cnt; struct uio_info *p = gdev->info; for (cnt = 0; cnt < MAX_PRUSS_EVT; cnt++, p++) { uio_unregister_device(p); kfree(p->name); } iounmap(gdev->prussio_vaddr); if (gdev->ddr_vaddr) { |
4719ebfd8 uio: uio_pruss: u... |
105 |
dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr, |
f1a304e79 UIO: add PRUSS UI... |
106 107 108 |
gdev->ddr_paddr); } if (gdev->sram_vaddr) |
2eb2478d4 uio: uio_pruss: r... |
109 110 111 |
gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz); |
f1a304e79 UIO: add PRUSS UI... |
112 |
kfree(gdev->info); |
e663c5dba uio: pruss: add c... |
113 |
clk_disable(gdev->pruss_clk); |
f1a304e79 UIO: add PRUSS UI... |
114 115 116 |
clk_put(gdev->pruss_clk); kfree(gdev); } |
4719ebfd8 uio: uio_pruss: u... |
117 |
static int pruss_probe(struct platform_device *pdev) |
f1a304e79 UIO: add PRUSS UI... |
118 119 120 121 |
{ struct uio_info *p; struct uio_pruss_dev *gdev; struct resource *regs_prussio; |
4719ebfd8 uio: uio_pruss: u... |
122 |
struct device *dev = &pdev->dev; |
95883676e uio: pruss: fix e... |
123 |
int ret, cnt, i, len; |
4719ebfd8 uio: uio_pruss: u... |
124 |
struct uio_pruss_pdata *pdata = dev_get_platdata(dev); |
f1a304e79 UIO: add PRUSS UI... |
125 126 127 128 |
gdev = kzalloc(sizeof(struct uio_pruss_dev), GFP_KERNEL); if (!gdev) return -ENOMEM; |
6396bb221 treewide: kzalloc... |
129 |
gdev->info = kcalloc(MAX_PRUSS_EVT, sizeof(*p), GFP_KERNEL); |
f1a304e79 UIO: add PRUSS UI... |
130 |
if (!gdev->info) { |
95883676e uio: pruss: fix e... |
131 132 |
ret = -ENOMEM; goto err_free_gdev; |
f1a304e79 UIO: add PRUSS UI... |
133 |
} |
4719ebfd8 uio: uio_pruss: u... |
134 |
|
f1a304e79 UIO: add PRUSS UI... |
135 |
/* Power on PRU in case its not done as part of boot-loader */ |
4719ebfd8 uio: uio_pruss: u... |
136 |
gdev->pruss_clk = clk_get(dev, "pruss"); |
f1a304e79 UIO: add PRUSS UI... |
137 |
if (IS_ERR(gdev->pruss_clk)) { |
4719ebfd8 uio: uio_pruss: u... |
138 139 |
dev_err(dev, "Failed to get clock "); |
cb3771b04 uio: uio_pruss: F... |
140 |
ret = PTR_ERR(gdev->pruss_clk); |
95883676e uio: pruss: fix e... |
141 142 143 144 145 146 147 148 |
goto err_free_info; } ret = clk_enable(gdev->pruss_clk); if (ret) { dev_err(dev, "Failed to enable clock "); goto err_clk_put; |
f1a304e79 UIO: add PRUSS UI... |
149 |
} |
4719ebfd8 uio: uio_pruss: u... |
150 |
regs_prussio = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
f1a304e79 UIO: add PRUSS UI... |
151 |
if (!regs_prussio) { |
4719ebfd8 uio: uio_pruss: u... |
152 153 |
dev_err(dev, "No PRUSS I/O resource specified "); |
95883676e uio: pruss: fix e... |
154 155 |
ret = -EIO; goto err_clk_disable; |
f1a304e79 UIO: add PRUSS UI... |
156 157 158 |
} if (!regs_prussio->start) { |
4719ebfd8 uio: uio_pruss: u... |
159 160 |
dev_err(dev, "Invalid memory resource "); |
95883676e uio: pruss: fix e... |
161 162 |
ret = -EIO; goto err_clk_disable; |
f1a304e79 UIO: add PRUSS UI... |
163 |
} |
2eb2478d4 uio: uio_pruss: r... |
164 165 166 |
if (pdata->sram_pool) { gdev->sram_pool = pdata->sram_pool; gdev->sram_vaddr = |
288342e9c drivers/uio/uio_p... |
167 168 |
(unsigned long)gen_pool_dma_alloc(gdev->sram_pool, sram_pool_sz, &gdev->sram_paddr); |
2eb2478d4 uio: uio_pruss: r... |
169 |
if (!gdev->sram_vaddr) { |
4719ebfd8 uio: uio_pruss: u... |
170 171 |
dev_err(dev, "Could not allocate SRAM pool "); |
95883676e uio: pruss: fix e... |
172 173 |
ret = -ENOMEM; goto err_clk_disable; |
2eb2478d4 uio: uio_pruss: r... |
174 |
} |
f1a304e79 UIO: add PRUSS UI... |
175 |
} |
4719ebfd8 uio: uio_pruss: u... |
176 |
gdev->ddr_vaddr = dma_alloc_coherent(dev, extram_pool_sz, |
f1a304e79 UIO: add PRUSS UI... |
177 178 |
&(gdev->ddr_paddr), GFP_KERNEL | GFP_DMA); if (!gdev->ddr_vaddr) { |
4719ebfd8 uio: uio_pruss: u... |
179 180 |
dev_err(dev, "Could not allocate external memory "); |
95883676e uio: pruss: fix e... |
181 182 |
ret = -ENOMEM; goto err_free_sram; |
f1a304e79 UIO: add PRUSS UI... |
183 184 185 186 187 |
} len = resource_size(regs_prussio); gdev->prussio_vaddr = ioremap(regs_prussio->start, len); if (!gdev->prussio_vaddr) { |
4719ebfd8 uio: uio_pruss: u... |
188 189 |
dev_err(dev, "Can't remap PRUSS I/O address range "); |
95883676e uio: pruss: fix e... |
190 191 |
ret = -ENOMEM; goto err_free_ddr_vaddr; |
f1a304e79 UIO: add PRUSS UI... |
192 193 194 |
} gdev->pintc_base = pdata->pintc_base; |
4719ebfd8 uio: uio_pruss: u... |
195 |
gdev->hostirq_start = platform_get_irq(pdev, 0); |
f1a304e79 UIO: add PRUSS UI... |
196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 |
for (cnt = 0, p = gdev->info; cnt < MAX_PRUSS_EVT; cnt++, p++) { p->mem[0].addr = regs_prussio->start; p->mem[0].size = resource_size(regs_prussio); p->mem[0].memtype = UIO_MEM_PHYS; p->mem[1].addr = gdev->sram_paddr; p->mem[1].size = sram_pool_sz; p->mem[1].memtype = UIO_MEM_PHYS; p->mem[2].addr = gdev->ddr_paddr; p->mem[2].size = extram_pool_sz; p->mem[2].memtype = UIO_MEM_PHYS; p->name = kasprintf(GFP_KERNEL, "pruss_evt%d", cnt); p->version = DRV_VERSION; /* Register PRUSS IRQ lines */ p->irq = gdev->hostirq_start + cnt; p->handler = pruss_handler; p->priv = gdev; |
4719ebfd8 uio: uio_pruss: u... |
217 |
ret = uio_register_device(dev, p); |
95883676e uio: pruss: fix e... |
218 219 220 221 |
if (ret < 0) { kfree(p->name); goto err_unloop; } |
f1a304e79 UIO: add PRUSS UI... |
222 |
} |
4719ebfd8 uio: uio_pruss: u... |
223 |
platform_set_drvdata(pdev, gdev); |
f1a304e79 UIO: add PRUSS UI... |
224 |
return 0; |
95883676e uio: pruss: fix e... |
225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 |
err_unloop: for (i = 0, p = gdev->info; i < cnt; i++, p++) { uio_unregister_device(p); kfree(p->name); } iounmap(gdev->prussio_vaddr); err_free_ddr_vaddr: dma_free_coherent(dev, extram_pool_sz, gdev->ddr_vaddr, gdev->ddr_paddr); err_free_sram: if (pdata->sram_pool) gen_pool_free(gdev->sram_pool, gdev->sram_vaddr, sram_pool_sz); err_clk_disable: clk_disable(gdev->pruss_clk); err_clk_put: clk_put(gdev->pruss_clk); err_free_info: kfree(gdev->info); err_free_gdev: kfree(gdev); |
f1a304e79 UIO: add PRUSS UI... |
245 246 |
return ret; } |
9b96c3124 uio: remove use o... |
247 |
static int pruss_remove(struct platform_device *dev) |
f1a304e79 UIO: add PRUSS UI... |
248 249 |
{ struct uio_pruss_dev *gdev = platform_get_drvdata(dev); |
4719ebfd8 uio: uio_pruss: u... |
250 |
pruss_cleanup(&dev->dev, gdev); |
f1a304e79 UIO: add PRUSS UI... |
251 252 253 254 255 |
return 0; } static struct platform_driver pruss_driver = { .probe = pruss_probe, |
5a59509b4 uio: remove use o... |
256 |
.remove = pruss_remove, |
f1a304e79 UIO: add PRUSS UI... |
257 258 |
.driver = { .name = DRV_NAME, |
f1a304e79 UIO: add PRUSS UI... |
259 260 |
}, }; |
11e3123d9 uio: convert driv... |
261 |
module_platform_driver(pruss_driver); |
f1a304e79 UIO: add PRUSS UI... |
262 263 264 265 266 |
MODULE_LICENSE("GPL v2"); MODULE_VERSION(DRV_VERSION); MODULE_AUTHOR("Amit Chatterjee <amit.chatterjee@ti.com>"); MODULE_AUTHOR("Pratheesh Gangadhar <pratheesh@ti.com>"); |