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Linux/arch/avr32/mach-at32ap/hsmc.c

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  1 /*
  2  * Static Memory Controller for AT32 chips
  3  *
  4  * Copyright (C) 2006 Atmel Corporation
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #include <linux/clk.h>
 11 #include <linux/err.h>
 12 #include <linux/init.h>
 13 #include <linux/module.h>
 14 #include <linux/platform_device.h>
 15 #include <linux/slab.h>
 16 
 17 #include <asm/io.h>
 18 #include <mach/smc.h>
 19 
 20 #include "hsmc.h"
 21 
 22 #define NR_CHIP_SELECTS 6
 23 
 24 struct hsmc {
 25         void __iomem *regs;
 26         struct clk *pclk;
 27         struct clk *mck;
 28 };
 29 
 30 static struct hsmc *hsmc;
 31 
 32 void smc_set_timing(struct smc_config *config,
 33                     const struct smc_timing *timing)
 34 {
 35         int recover;
 36         int cycle;
 37 
 38         unsigned long mul;
 39 
 40         /* Reset all SMC timings */
 41         config->ncs_read_setup  = 0;
 42         config->nrd_setup       = 0;
 43         config->ncs_write_setup = 0;
 44         config->nwe_setup       = 0;
 45         config->ncs_read_pulse  = 0;
 46         config->nrd_pulse       = 0;
 47         config->ncs_write_pulse = 0;
 48         config->nwe_pulse       = 0;
 49         config->read_cycle      = 0;
 50         config->write_cycle     = 0;
 51 
 52         /*
 53          * cycles = x / T = x * f
 54          *   = ((x * 1000000000) * ((f * 65536) / 1000000000)) / 65536
 55          *   = ((x * 1000000000) * (((f / 10000) * 65536) / 100000)) / 65536
 56          */
 57         mul = (clk_get_rate(hsmc->mck) / 10000) << 16;
 58         mul /= 100000;
 59 
 60 #define ns2cyc(x) ((((x) * mul) + 65535) >> 16)
 61 
 62         if (timing->ncs_read_setup > 0)
 63                 config->ncs_read_setup = ns2cyc(timing->ncs_read_setup);
 64 
 65         if (timing->nrd_setup > 0)
 66                 config->nrd_setup = ns2cyc(timing->nrd_setup);
 67 
 68         if (timing->ncs_write_setup > 0)
 69                 config->ncs_write_setup = ns2cyc(timing->ncs_write_setup);
 70 
 71         if (timing->nwe_setup > 0)
 72                 config->nwe_setup = ns2cyc(timing->nwe_setup);
 73 
 74         if (timing->ncs_read_pulse > 0)
 75                 config->ncs_read_pulse = ns2cyc(timing->ncs_read_pulse);
 76 
 77         if (timing->nrd_pulse > 0)
 78                 config->nrd_pulse = ns2cyc(timing->nrd_pulse);
 79 
 80         if (timing->ncs_write_pulse > 0)
 81                 config->ncs_write_pulse = ns2cyc(timing->ncs_write_pulse);
 82 
 83         if (timing->nwe_pulse > 0)
 84                 config->nwe_pulse = ns2cyc(timing->nwe_pulse);
 85 
 86         if (timing->read_cycle > 0)
 87                 config->read_cycle = ns2cyc(timing->read_cycle);
 88 
 89         if (timing->write_cycle > 0)
 90                 config->write_cycle = ns2cyc(timing->write_cycle);
 91 
 92         /* Extend read cycle in needed */
 93         if (timing->ncs_read_recover > 0)
 94                 recover = ns2cyc(timing->ncs_read_recover);
 95         else
 96                 recover = 1;
 97 
 98         cycle = config->ncs_read_setup + config->ncs_read_pulse + recover;
 99 
100         if (config->read_cycle < cycle)
101                 config->read_cycle = cycle;
102 
103         /* Extend read cycle in needed */
104         if (timing->nrd_recover > 0)
105                 recover = ns2cyc(timing->nrd_recover);
106         else
107                 recover = 1;
108 
109         cycle = config->nrd_setup + config->nrd_pulse + recover;
110 
111         if (config->read_cycle < cycle)
112                 config->read_cycle = cycle;
113 
114         /* Extend write cycle in needed */
115         if (timing->ncs_write_recover > 0)
116                 recover = ns2cyc(timing->ncs_write_recover);
117         else
118                 recover = 1;
119 
120         cycle = config->ncs_write_setup + config->ncs_write_pulse + recover;
121 
122         if (config->write_cycle < cycle)
123                 config->write_cycle = cycle;
124 
125         /* Extend write cycle in needed */
126         if (timing->nwe_recover > 0)
127                 recover = ns2cyc(timing->nwe_recover);
128         else
129                 recover = 1;
130 
131         cycle = config->nwe_setup + config->nwe_pulse + recover;
132 
133         if (config->write_cycle < cycle)
134                 config->write_cycle = cycle;
135 }
136 EXPORT_SYMBOL(smc_set_timing);
137 
138 int smc_set_configuration(int cs, const struct smc_config *config)
139 {
140         unsigned long offset;
141         u32 setup, pulse, cycle, mode;
142 
143         if (!hsmc)
144                 return -ENODEV;
145         if (cs >= NR_CHIP_SELECTS)
146                 return -EINVAL;
147 
148         setup = (HSMC_BF(NWE_SETUP, config->nwe_setup)
149                  | HSMC_BF(NCS_WR_SETUP, config->ncs_write_setup)
150                  | HSMC_BF(NRD_SETUP, config->nrd_setup)
151                  | HSMC_BF(NCS_RD_SETUP, config->ncs_read_setup));
152         pulse = (HSMC_BF(NWE_PULSE, config->nwe_pulse)
153                  | HSMC_BF(NCS_WR_PULSE, config->ncs_write_pulse)
154                  | HSMC_BF(NRD_PULSE, config->nrd_pulse)
155                  | HSMC_BF(NCS_RD_PULSE, config->ncs_read_pulse));
156         cycle = (HSMC_BF(NWE_CYCLE, config->write_cycle)
157                  | HSMC_BF(NRD_CYCLE, config->read_cycle));
158 
159         switch (config->bus_width) {
160         case 1:
161                 mode = HSMC_BF(DBW, HSMC_DBW_8_BITS);
162                 break;
163         case 2:
164                 mode = HSMC_BF(DBW, HSMC_DBW_16_BITS);
165                 break;
166         case 4:
167                 mode = HSMC_BF(DBW, HSMC_DBW_32_BITS);
168                 break;
169         default:
170                 return -EINVAL;
171         }
172 
173         switch (config->nwait_mode) {
174         case 0:
175                 mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_DISABLED);
176                 break;
177         case 1:
178                 mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_RESERVED);
179                 break;
180         case 2:
181                 mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_FROZEN);
182                 break;
183         case 3:
184                 mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_READY);
185                 break;
186         default:
187                 return -EINVAL;
188         }
189 
190         if (config->tdf_cycles) {
191                 mode |= HSMC_BF(TDF_CYCLES, config->tdf_cycles);
192         }
193 
194         if (config->nrd_controlled)
195                 mode |= HSMC_BIT(READ_MODE);
196         if (config->nwe_controlled)
197                 mode |= HSMC_BIT(WRITE_MODE);
198         if (config->byte_write)
199                 mode |= HSMC_BIT(BAT);
200         if (config->tdf_mode)
201                 mode |= HSMC_BIT(TDF_MODE);
202 
203         pr_debug("smc cs%d: setup/%08x pulse/%08x cycle/%08x mode/%08x\n",
204                  cs, setup, pulse, cycle, mode);
205 
206         offset = cs * 0x10;
207         hsmc_writel(hsmc, SETUP0 + offset, setup);
208         hsmc_writel(hsmc, PULSE0 + offset, pulse);
209         hsmc_writel(hsmc, CYCLE0 + offset, cycle);
210         hsmc_writel(hsmc, MODE0 + offset, mode);
211         hsmc_readl(hsmc, MODE0); /* I/O barrier */
212 
213         return 0;
214 }
215 EXPORT_SYMBOL(smc_set_configuration);
216 
217 static int hsmc_probe(struct platform_device *pdev)
218 {
219         struct resource *regs;
220         struct clk *pclk, *mck;
221         int ret;
222 
223         if (hsmc)
224                 return -EBUSY;
225 
226         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
227         if (!regs)
228                 return -ENXIO;
229         pclk = clk_get(&pdev->dev, "pclk");
230         if (IS_ERR(pclk))
231                 return PTR_ERR(pclk);
232         mck = clk_get(&pdev->dev, "mck");
233         if (IS_ERR(mck)) {
234                 ret = PTR_ERR(mck);
235                 goto out_put_pclk;
236         }
237 
238         ret = -ENOMEM;
239         hsmc = kzalloc(sizeof(struct hsmc), GFP_KERNEL);
240         if (!hsmc)
241                 goto out_put_clocks;
242 
243         clk_enable(pclk);
244         clk_enable(mck);
245 
246         hsmc->pclk = pclk;
247         hsmc->mck = mck;
248         hsmc->regs = ioremap(regs->start, resource_size(regs));
249         if (!hsmc->regs)
250                 goto out_disable_clocks;
251 
252         dev_info(&pdev->dev, "Atmel Static Memory Controller at 0x%08lx\n",
253                  (unsigned long)regs->start);
254 
255         platform_set_drvdata(pdev, hsmc);
256 
257         return 0;
258 
259 out_disable_clocks:
260         clk_disable(mck);
261         clk_disable(pclk);
262         kfree(hsmc);
263 out_put_clocks:
264         clk_put(mck);
265 out_put_pclk:
266         clk_put(pclk);
267         hsmc = NULL;
268         return ret;
269 }
270 
271 static struct platform_driver hsmc_driver = {
272         .probe          = hsmc_probe,
273         .driver         = {
274                 .name   = "smc",
275         },
276 };
277 
278 static int __init hsmc_init(void)
279 {
280         return platform_driver_register(&hsmc_driver);
281 }
282 core_initcall(hsmc_init);
283 

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