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libata: Updates and fixes for pata_at91 driver
Please consider the following updates and fixes for pata_at91 driver. * Removed extra headers Here we need only static memory controller properties, which are contained in generic header at91sam9_smc.h. No need to include any specific headers for at91sam9260 SoC. * No harsh BUG_ON for get_clk in set_smc_timing function get_clk is now performed in driver probing function, probing fails if master clock is not available * Fixed uint/ulong mess in calc_mck_cycles function Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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760cdb7760
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1 changed files with 36 additions and 31 deletions
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@ -26,9 +26,7 @@
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#include <linux/platform_device.h>
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#include <linux/ata_platform.h>
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#include <mach/at91sam9260_matrix.h>
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#include <mach/at91sam9_smc.h>
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#include <mach/at91sam9260.h>
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#include <mach/board.h>
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#include <mach/gpio.h>
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@ -44,65 +42,62 @@ struct at91_ide_info {
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unsigned long mode;
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unsigned int cs;
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struct clk *mck;
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void __iomem *ide_addr;
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void __iomem *alt_addr;
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};
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const struct ata_timing initial_timing =
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static const struct ata_timing initial_timing =
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{XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0};
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static unsigned int calc_mck_cycles(unsigned int ns, unsigned int mck_hz)
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static unsigned long calc_mck_cycles(unsigned long ns, unsigned long mck_hz)
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{
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unsigned long mul;
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/*
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* cycles = x [nsec] * f [Hz] / 10^9 [ns in sec] =
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* x * (f / 1_000_000_000) =
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* x * ((f * 65536) / 1_000_000_000) / 65536 =
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* x * (((f / 10_000) * 65536) / 100_000) / 65536 =
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*/
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/*
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* cycles = x [nsec] * f [Hz] / 10^9 [ns in sec] =
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* x * (f / 1_000_000_000) =
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* x * ((f * 65536) / 1_000_000_000) / 65536 =
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* x * (((f / 10_000) * 65536) / 100_000) / 65536 =
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*/
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mul = (mck_hz / 10000) << 16;
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mul /= 100000;
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mul = (mck_hz / 10000) << 16;
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mul /= 100000;
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return (ns * mul + 65536) >> 16; /* rounding */
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return (ns * mul + 65536) >> 16; /* rounding */
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}
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static void set_smc_mode(struct at91_ide_info *info)
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{
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at91_sys_write(AT91_SMC_MODE(info->cs), info->mode);
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return;
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at91_sys_write(AT91_SMC_MODE(info->cs), info->mode);
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return;
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}
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static void set_smc_timing(struct device *dev,
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struct at91_ide_info *info, const struct ata_timing *ata)
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{
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int read_cycle, write_cycle, active, recover;
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int nrd_setup, nrd_pulse, nrd_recover;
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int nwe_setup, nwe_pulse;
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unsigned long read_cycle, write_cycle, active, recover;
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unsigned long nrd_setup, nrd_pulse, nrd_recover;
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unsigned long nwe_setup, nwe_pulse;
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int ncs_write_setup, ncs_write_pulse;
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int ncs_read_setup, ncs_read_pulse;
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unsigned long ncs_write_setup, ncs_write_pulse;
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unsigned long ncs_read_setup, ncs_read_pulse;
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unsigned int mck_hz;
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struct clk *mck;
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unsigned long mck_hz;
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read_cycle = ata->cyc8b;
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nrd_setup = ata->setup;
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nrd_pulse = ata->act8b;
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nrd_recover = ata->rec8b;
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mck = clk_get(NULL, "mck");
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BUG_ON(IS_ERR(mck));
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mck_hz = clk_get_rate(mck);
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mck_hz = clk_get_rate(info->mck);
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read_cycle = calc_mck_cycles(read_cycle, mck_hz);
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nrd_setup = calc_mck_cycles(nrd_setup, mck_hz);
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nrd_pulse = calc_mck_cycles(nrd_pulse, mck_hz);
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nrd_recover = calc_mck_cycles(nrd_recover, mck_hz);
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clk_put(mck);
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active = nrd_setup + nrd_pulse;
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recover = read_cycle - active;
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@ -121,13 +116,13 @@ static void set_smc_timing(struct device *dev,
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ncs_write_setup = ncs_read_setup;
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ncs_write_pulse = ncs_read_pulse;
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dev_dbg(dev, "ATA timings: nrd_setup = %d nrd_pulse = %d nrd_cycle = %d\n",
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dev_dbg(dev, "ATA timings: nrd_setup = %lu nrd_pulse = %lu nrd_cycle = %lu\n",
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nrd_setup, nrd_pulse, read_cycle);
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dev_dbg(dev, "ATA timings: nwe_setup = %d nwe_pulse = %d nwe_cycle = %d\n",
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dev_dbg(dev, "ATA timings: nwe_setup = %lu nwe_pulse = %lu nwe_cycle = %lu\n",
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nwe_setup, nwe_pulse, write_cycle);
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dev_dbg(dev, "ATA timings: ncs_read_setup = %d ncs_read_pulse = %d\n",
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dev_dbg(dev, "ATA timings: ncs_read_setup = %lu ncs_read_pulse = %lu\n",
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ncs_read_setup, ncs_read_pulse);
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dev_dbg(dev, "ATA timings: ncs_write_setup = %d ncs_write_pulse = %d\n",
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dev_dbg(dev, "ATA timings: ncs_write_setup = %lu ncs_write_pulse = %lu\n",
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ncs_write_setup, ncs_write_pulse);
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at91_sys_write(AT91_SMC_SETUP(info->cs),
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@ -217,6 +212,7 @@ static int __devinit pata_at91_probe(struct platform_device *pdev)
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struct resource *mem_res;
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struct ata_host *host;
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struct ata_port *ap;
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int irq_flags = 0;
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int irq = 0;
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int ret;
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@ -261,6 +257,13 @@ static int __devinit pata_at91_probe(struct platform_device *pdev)
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return -ENOMEM;
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}
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info->mck = clk_get(NULL, "mck");
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if (IS_ERR(info->mck)) {
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dev_err(dev, "failed to get access to mck clock\n");
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return -ENODEV;
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}
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info->cs = board->chipselect;
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info->mode = AT91_SMC_READMODE | AT91_SMC_WRITEMODE |
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AT91_SMC_EXNWMODE_READY | AT91_SMC_BAT_SELECT |
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@ -304,6 +307,7 @@ static int __devinit pata_at91_probe(struct platform_device *pdev)
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devm_iounmap(dev, info->ide_addr);
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err_ide_ioremap:
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clk_put(info->mck);
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kfree(info);
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return ret;
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@ -326,6 +330,7 @@ static int __devexit pata_at91_remove(struct platform_device *pdev)
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devm_iounmap(dev, info->ide_addr);
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devm_iounmap(dev, info->alt_addr);
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clk_put(info->mck);
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kfree(info);
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return 0;
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